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1/*
2 * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
3 *
4 * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
5 * PMC-Sierra Inc
6 *
7 * Copyright (C) 2008, 2009 PMC Sierra Inc
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
22 * USA
23 *
24 */
25#include <linux/fs.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/errno.h>
29#include <linux/kernel.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/pci.h>
33#include <linux/wait.h>
34#include <linux/spinlock.h>
35#include <linux/sched.h>
36#include <linux/interrupt.h>
37#include <linux/blkdev.h>
38#include <linux/firmware.h>
39#include <linux/module.h>
40#include <linux/moduleparam.h>
41#include <linux/hdreg.h>
42#include <linux/io.h>
43#include <linux/slab.h>
44#include <asm/irq.h>
45#include <asm/processor.h>
46#include <linux/libata.h>
47#include <linux/mutex.h>
48#include <scsi/scsi.h>
49#include <scsi/scsi_host.h>
50#include <scsi/scsi_device.h>
51#include <scsi/scsi_tcq.h>
52#include <scsi/scsi_eh.h>
53#include <scsi/scsi_cmnd.h>
54#include <scsi/scsicam.h>
55
56#include "pmcraid.h"
57
58/*
59 * Module configuration parameters
60 */
61static unsigned int pmcraid_debug_log;
62static unsigned int pmcraid_disable_aen;
63static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
64static unsigned int pmcraid_enable_msix;
65
66/*
67 * Data structures to support multiple adapters by the LLD.
68 * pmcraid_adapter_count - count of configured adapters
69 */
70static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
71
72/*
73 * Supporting user-level control interface through IOCTL commands.
74 * pmcraid_major - major number to use
75 * pmcraid_minor - minor number(s) to use
76 */
77static unsigned int pmcraid_major;
78static struct class *pmcraid_class;
79DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
80
81/*
82 * Module parameters
83 */
84MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
85MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
86MODULE_LICENSE("GPL");
87MODULE_VERSION(PMCRAID_DRIVER_VERSION);
88
89module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
90MODULE_PARM_DESC(log_level,
91 "Enables firmware error code logging, default :1 high-severity"
92 " errors, 2: all errors including high-severity errors,"
93 " 0: disables logging");
94
95module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
96MODULE_PARM_DESC(debug,
97 "Enable driver verbose message logging. Set 1 to enable."
98 "(default: 0)");
99
100module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
101MODULE_PARM_DESC(disable_aen,
102 "Disable driver aen notifications to apps. Set 1 to disable."
103 "(default: 0)");
104
105/* chip specific constants for PMC MaxRAID controllers (same for
106 * 0x5220 and 0x8010
107 */
108static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
109 {
110 .ioastatus = 0x0,
111 .ioarrin = 0x00040,
112 .mailbox = 0x7FC30,
113 .global_intr_mask = 0x00034,
114 .ioa_host_intr = 0x0009C,
115 .ioa_host_intr_clr = 0x000A0,
116 .ioa_host_msix_intr = 0x7FC40,
117 .ioa_host_mask = 0x7FC28,
118 .ioa_host_mask_clr = 0x7FC28,
119 .host_ioa_intr = 0x00020,
120 .host_ioa_intr_clr = 0x00020,
121 .transop_timeout = 300
122 }
123};
124
125/*
126 * PCI device ids supported by pmcraid driver
127 */
128static struct pci_device_id pmcraid_pci_table[] = {
129 { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
130 0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
131 },
132 {}
133};
134
135MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
136
137
138
139/**
140 * pmcraid_slave_alloc - Prepare for commands to a device
141 * @scsi_dev: scsi device struct
142 *
143 * This function is called by mid-layer prior to sending any command to the new
144 * device. Stores resource entry details of the device in scsi_device struct.
145 * Queuecommand uses the resource handle and other details to fill up IOARCB
146 * while sending commands to the device.
147 *
148 * Return value:
149 * 0 on success / -ENXIO if device does not exist
150 */
151static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
152{
153 struct pmcraid_resource_entry *temp, *res = NULL;
154 struct pmcraid_instance *pinstance;
155 u8 target, bus, lun;
156 unsigned long lock_flags;
157 int rc = -ENXIO;
158 u16 fw_version;
159
160 pinstance = shost_priv(scsi_dev->host);
161
162 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
163
164 /* Driver exposes VSET and GSCSI resources only; all other device types
165 * are not exposed. Resource list is synchronized using resource lock
166 * so any traversal or modifications to the list should be done inside
167 * this lock
168 */
169 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
170 list_for_each_entry(temp, &pinstance->used_res_q, queue) {
171
172 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
173 if (RES_IS_VSET(temp->cfg_entry)) {
174 if (fw_version <= PMCRAID_FW_VERSION_1)
175 target = temp->cfg_entry.unique_flags1;
176 else
177 target = temp->cfg_entry.array_id & 0xFF;
178
179 if (target > PMCRAID_MAX_VSET_TARGETS)
180 continue;
181 bus = PMCRAID_VSET_BUS_ID;
182 lun = 0;
183 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
184 target = RES_TARGET(temp->cfg_entry.resource_address);
185 bus = PMCRAID_PHYS_BUS_ID;
186 lun = RES_LUN(temp->cfg_entry.resource_address);
187 } else {
188 continue;
189 }
190
191 if (bus == scsi_dev->channel &&
192 target == scsi_dev->id &&
193 lun == scsi_dev->lun) {
194 res = temp;
195 break;
196 }
197 }
198
199 if (res) {
200 res->scsi_dev = scsi_dev;
201 scsi_dev->hostdata = res;
202 res->change_detected = 0;
203 atomic_set(&res->read_failures, 0);
204 atomic_set(&res->write_failures, 0);
205 rc = 0;
206 }
207 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
208 return rc;
209}
210
211/**
212 * pmcraid_slave_configure - Configures a SCSI device
213 * @scsi_dev: scsi device struct
214 *
215 * This function is executed by SCSI mid layer just after a device is first
216 * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
217 * timeout value (default 30s) will be over-written to a higher value (60s)
218 * and max_sectors value will be over-written to 512. It also sets queue depth
219 * to host->cmd_per_lun value
220 *
221 * Return value:
222 * 0 on success
223 */
224static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
225{
226 struct pmcraid_resource_entry *res = scsi_dev->hostdata;
227
228 if (!res)
229 return 0;
230
231 /* LLD exposes VSETs and Enclosure devices only */
232 if (RES_IS_GSCSI(res->cfg_entry) &&
233 scsi_dev->type != TYPE_ENCLOSURE)
234 return -ENXIO;
235
236 pmcraid_info("configuring %x:%x:%x:%x\n",
237 scsi_dev->host->unique_id,
238 scsi_dev->channel,
239 scsi_dev->id,
240 scsi_dev->lun);
241
242 if (RES_IS_GSCSI(res->cfg_entry)) {
243 scsi_dev->allow_restart = 1;
244 } else if (RES_IS_VSET(res->cfg_entry)) {
245 scsi_dev->allow_restart = 1;
246 blk_queue_rq_timeout(scsi_dev->request_queue,
247 PMCRAID_VSET_IO_TIMEOUT);
248 blk_queue_max_hw_sectors(scsi_dev->request_queue,
249 PMCRAID_VSET_MAX_SECTORS);
250 }
251
252 if (scsi_dev->tagged_supported &&
253 (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
254 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
255 scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
256 scsi_dev->host->cmd_per_lun);
257 } else {
258 scsi_adjust_queue_depth(scsi_dev, 0,
259 scsi_dev->host->cmd_per_lun);
260 }
261
262 return 0;
263}
264
265/**
266 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
267 *
268 * @scsi_dev: scsi device struct
269 *
270 * This is called by mid-layer before removing a device. Pointer assignments
271 * done in pmcraid_slave_alloc will be reset to NULL here.
272 *
273 * Return value
274 * none
275 */
276static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
277{
278 struct pmcraid_resource_entry *res;
279
280 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
281
282 if (res)
283 res->scsi_dev = NULL;
284
285 scsi_dev->hostdata = NULL;
286}
287
288/**
289 * pmcraid_change_queue_depth - Change the device's queue depth
290 * @scsi_dev: scsi device struct
291 * @depth: depth to set
292 * @reason: calling context
293 *
294 * Return value
295 * actual depth set
296 */
297static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
298 int reason)
299{
300 if (reason != SCSI_QDEPTH_DEFAULT)
301 return -EOPNOTSUPP;
302
303 if (depth > PMCRAID_MAX_CMD_PER_LUN)
304 depth = PMCRAID_MAX_CMD_PER_LUN;
305
306 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
307
308 return scsi_dev->queue_depth;
309}
310
311/**
312 * pmcraid_change_queue_type - Change the device's queue type
313 * @scsi_dev: scsi device struct
314 * @tag: type of tags to use
315 *
316 * Return value:
317 * actual queue type set
318 */
319static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
320{
321 struct pmcraid_resource_entry *res;
322
323 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
324
325 if ((res) && scsi_dev->tagged_supported &&
326 (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
327 scsi_set_tag_type(scsi_dev, tag);
328
329 if (tag)
330 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
331 else
332 scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
333 } else
334 tag = 0;
335
336 return tag;
337}
338
339
340/**
341 * pmcraid_init_cmdblk - initializes a command block
342 *
343 * @cmd: pointer to struct pmcraid_cmd to be initialized
344 * @index: if >=0 first time initialization; otherwise reinitialization
345 *
346 * Return Value
347 * None
348 */
349void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
350{
351 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
352 dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
353
354 if (index >= 0) {
355 /* first time initialization (called from probe) */
356 u32 ioasa_offset =
357 offsetof(struct pmcraid_control_block, ioasa);
358
359 cmd->index = index;
360 ioarcb->response_handle = cpu_to_le32(index << 2);
361 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
362 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
363 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
364 } else {
365 /* re-initialization of various lengths, called once command is
366 * processed by IOA
367 */
368 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
369 ioarcb->hrrq_id = 0;
370 ioarcb->request_flags0 = 0;
371 ioarcb->request_flags1 = 0;
372 ioarcb->cmd_timeout = 0;
373 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
374 ioarcb->ioadl_bus_addr = 0;
375 ioarcb->ioadl_length = 0;
376 ioarcb->data_transfer_length = 0;
377 ioarcb->add_cmd_param_length = 0;
378 ioarcb->add_cmd_param_offset = 0;
379 cmd->ioa_cb->ioasa.ioasc = 0;
380 cmd->ioa_cb->ioasa.residual_data_length = 0;
381 cmd->time_left = 0;
382 }
383
384 cmd->cmd_done = NULL;
385 cmd->scsi_cmd = NULL;
386 cmd->release = 0;
387 cmd->completion_req = 0;
388 cmd->sense_buffer = 0;
389 cmd->sense_buffer_dma = 0;
390 cmd->dma_handle = 0;
391 init_timer(&cmd->timer);
392}
393
394/**
395 * pmcraid_reinit_cmdblk - reinitialize a command block
396 *
397 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
398 *
399 * Return Value
400 * None
401 */
402static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
403{
404 pmcraid_init_cmdblk(cmd, -1);
405}
406
407/**
408 * pmcraid_get_free_cmd - get a free cmd block from command block pool
409 * @pinstance: adapter instance structure
410 *
411 * Return Value:
412 * returns pointer to cmd block or NULL if no blocks are available
413 */
414static struct pmcraid_cmd *pmcraid_get_free_cmd(
415 struct pmcraid_instance *pinstance
416)
417{
418 struct pmcraid_cmd *cmd = NULL;
419 unsigned long lock_flags;
420
421 /* free cmd block list is protected by free_pool_lock */
422 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
423
424 if (!list_empty(&pinstance->free_cmd_pool)) {
425 cmd = list_entry(pinstance->free_cmd_pool.next,
426 struct pmcraid_cmd, free_list);
427 list_del(&cmd->free_list);
428 }
429 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
430
431 /* Initialize the command block before giving it the caller */
432 if (cmd != NULL)
433 pmcraid_reinit_cmdblk(cmd);
434 return cmd;
435}
436
437/**
438 * pmcraid_return_cmd - return a completed command block back into free pool
439 * @cmd: pointer to the command block
440 *
441 * Return Value:
442 * nothing
443 */
444void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
445{
446 struct pmcraid_instance *pinstance = cmd->drv_inst;
447 unsigned long lock_flags;
448
449 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
450 list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
451 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
452}
453
454/**
455 * pmcraid_read_interrupts - reads IOA interrupts
456 *
457 * @pinstance: pointer to adapter instance structure
458 *
459 * Return value
460 * interrupts read from IOA
461 */
462static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
463{
464 return (pinstance->interrupt_mode) ?
465 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
466 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
467}
468
469/**
470 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
471 *
472 * @pinstance: pointer to per adapter instance structure
473 * @intrs: interrupts to disable
474 *
475 * Return Value
476 * None
477 */
478static void pmcraid_disable_interrupts(
479 struct pmcraid_instance *pinstance,
480 u32 intrs
481)
482{
483 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
484 u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
485
486 iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
487 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
488 ioread32(pinstance->int_regs.global_interrupt_mask_reg);
489
490 if (!pinstance->interrupt_mode) {
491 iowrite32(intrs,
492 pinstance->int_regs.ioa_host_interrupt_mask_reg);
493 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
494 }
495}
496
497/**
498 * pmcraid_enable_interrupts - Enables specified interrupts
499 *
500 * @pinstance: pointer to per adapter instance structure
501 * @intr: interrupts to enable
502 *
503 * Return Value
504 * None
505 */
506static void pmcraid_enable_interrupts(
507 struct pmcraid_instance *pinstance,
508 u32 intrs
509)
510{
511 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
512 u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
513
514 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
515
516 if (!pinstance->interrupt_mode) {
517 iowrite32(~intrs,
518 pinstance->int_regs.ioa_host_interrupt_mask_reg);
519 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
520 }
521
522 pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
523 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
524 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
525}
526
527/**
528 * pmcraid_clr_trans_op - clear trans to op interrupt
529 *
530 * @pinstance: pointer to per adapter instance structure
531 *
532 * Return Value
533 * None
534 */
535static void pmcraid_clr_trans_op(
536 struct pmcraid_instance *pinstance
537)
538{
539 unsigned long lock_flags;
540
541 if (!pinstance->interrupt_mode) {
542 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
543 pinstance->int_regs.ioa_host_interrupt_mask_reg);
544 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
545 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
546 pinstance->int_regs.ioa_host_interrupt_clr_reg);
547 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
548 }
549
550 if (pinstance->reset_cmd != NULL) {
551 del_timer(&pinstance->reset_cmd->timer);
552 spin_lock_irqsave(
553 pinstance->host->host_lock, lock_flags);
554 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
555 spin_unlock_irqrestore(
556 pinstance->host->host_lock, lock_flags);
557 }
558}
559
560/**
561 * pmcraid_reset_type - Determine the required reset type
562 * @pinstance: pointer to adapter instance structure
563 *
564 * IOA requires hard reset if any of the following conditions is true.
565 * 1. If HRRQ valid interrupt is not masked
566 * 2. IOA reset alert doorbell is set
567 * 3. If there are any error interrupts
568 */
569static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
570{
571 u32 mask;
572 u32 intrs;
573 u32 alerts;
574
575 mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
576 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
577 alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
578
579 if ((mask & INTRS_HRRQ_VALID) == 0 ||
580 (alerts & DOORBELL_IOA_RESET_ALERT) ||
581 (intrs & PMCRAID_ERROR_INTERRUPTS)) {
582 pmcraid_info("IOA requires hard reset\n");
583 pinstance->ioa_hard_reset = 1;
584 }
585
586 /* If unit check is active, trigger the dump */
587 if (intrs & INTRS_IOA_UNIT_CHECK)
588 pinstance->ioa_unit_check = 1;
589}
590
591/**
592 * pmcraid_bist_done - completion function for PCI BIST
593 * @cmd: pointer to reset command
594 * Return Value
595 * none
596 */
597
598static void pmcraid_ioa_reset(struct pmcraid_cmd *);
599
600static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
601{
602 struct pmcraid_instance *pinstance = cmd->drv_inst;
603 unsigned long lock_flags;
604 int rc;
605 u16 pci_reg;
606
607 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
608
609 /* If PCI config space can't be accessed wait for another two secs */
610 if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
611 cmd->time_left > 0) {
612 pmcraid_info("BIST not complete, waiting another 2 secs\n");
613 cmd->timer.expires = jiffies + cmd->time_left;
614 cmd->time_left = 0;
615 cmd->timer.data = (unsigned long)cmd;
616 cmd->timer.function =
617 (void (*)(unsigned long))pmcraid_bist_done;
618 add_timer(&cmd->timer);
619 } else {
620 cmd->time_left = 0;
621 pmcraid_info("BIST is complete, proceeding with reset\n");
622 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
623 pmcraid_ioa_reset(cmd);
624 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
625 }
626}
627
628/**
629 * pmcraid_start_bist - starts BIST
630 * @cmd: pointer to reset cmd
631 * Return Value
632 * none
633 */
634static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
635{
636 struct pmcraid_instance *pinstance = cmd->drv_inst;
637 u32 doorbells, intrs;
638
639 /* proceed with bist and wait for 2 seconds */
640 iowrite32(DOORBELL_IOA_START_BIST,
641 pinstance->int_regs.host_ioa_interrupt_reg);
642 doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
643 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
644 pmcraid_info("doorbells after start bist: %x intrs: %x\n",
645 doorbells, intrs);
646
647 cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
648 cmd->timer.data = (unsigned long)cmd;
649 cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
650 cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
651 add_timer(&cmd->timer);
652}
653
654/**
655 * pmcraid_reset_alert_done - completion routine for reset_alert
656 * @cmd: pointer to command block used in reset sequence
657 * Return value
658 * None
659 */
660static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
661{
662 struct pmcraid_instance *pinstance = cmd->drv_inst;
663 u32 status = ioread32(pinstance->ioa_status);
664 unsigned long lock_flags;
665
666 /* if the critical operation in progress bit is set or the wait times
667 * out, invoke reset engine to proceed with hard reset. If there is
668 * some more time to wait, restart the timer
669 */
670 if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
671 cmd->time_left <= 0) {
672 pmcraid_info("critical op is reset proceeding with reset\n");
673 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
674 pmcraid_ioa_reset(cmd);
675 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
676 } else {
677 pmcraid_info("critical op is not yet reset waiting again\n");
678 /* restart timer if some more time is available to wait */
679 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
680 cmd->timer.data = (unsigned long)cmd;
681 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
682 cmd->timer.function =
683 (void (*)(unsigned long))pmcraid_reset_alert_done;
684 add_timer(&cmd->timer);
685 }
686}
687
688/**
689 * pmcraid_reset_alert - alerts IOA for a possible reset
690 * @cmd : command block to be used for reset sequence.
691 *
692 * Return Value
693 * returns 0 if pci config-space is accessible and RESET_DOORBELL is
694 * successfully written to IOA. Returns non-zero in case pci_config_space
695 * is not accessible
696 */
697static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
698static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
699{
700 struct pmcraid_instance *pinstance = cmd->drv_inst;
701 u32 doorbells;
702 int rc;
703 u16 pci_reg;
704
705 /* If we are able to access IOA PCI config space, alert IOA that we are
706 * going to reset it soon. This enables IOA to preserv persistent error
707 * data if any. In case memory space is not accessible, proceed with
708 * BIST or slot_reset
709 */
710 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
711 if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
712
713 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
714 * reset IOA doesn't generate any interrupts when CRITICAL
715 * OPERATION bit is reset. A timer is started to wait for this
716 * bit to be reset.
717 */
718 cmd->time_left = PMCRAID_RESET_TIMEOUT;
719 cmd->timer.data = (unsigned long)cmd;
720 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
721 cmd->timer.function =
722 (void (*)(unsigned long))pmcraid_reset_alert_done;
723 add_timer(&cmd->timer);
724
725 iowrite32(DOORBELL_IOA_RESET_ALERT,
726 pinstance->int_regs.host_ioa_interrupt_reg);
727 doorbells =
728 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
729 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
730 } else {
731 pmcraid_info("PCI config is not accessible starting BIST\n");
732 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
733 pmcraid_start_bist(cmd);
734 }
735}
736
737/**
738 * pmcraid_timeout_handler - Timeout handler for internally generated ops
739 *
740 * @cmd : pointer to command structure, that got timedout
741 *
742 * This function blocks host requests and initiates an adapter reset.
743 *
744 * Return value:
745 * None
746 */
747static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
748{
749 struct pmcraid_instance *pinstance = cmd->drv_inst;
750 unsigned long lock_flags;
751
752 dev_info(&pinstance->pdev->dev,
753 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
754 cmd->ioa_cb->ioarcb.cdb[0]);
755
756 /* Command timeouts result in hard reset sequence. The command that got
757 * timed out may be the one used as part of reset sequence. In this
758 * case restart reset sequence using the same command block even if
759 * reset is in progress. Otherwise fail this command and get a free
760 * command block to restart the reset sequence.
761 */
762 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
763 if (!pinstance->ioa_reset_in_progress) {
764 pinstance->ioa_reset_attempts = 0;
765 cmd = pmcraid_get_free_cmd(pinstance);
766
767 /* If we are out of command blocks, just return here itself.
768 * Some other command's timeout handler can do the reset job
769 */
770 if (cmd == NULL) {
771 spin_unlock_irqrestore(pinstance->host->host_lock,
772 lock_flags);
773 pmcraid_err("no free cmnd block for timeout handler\n");
774 return;
775 }
776
777 pinstance->reset_cmd = cmd;
778 pinstance->ioa_reset_in_progress = 1;
779 } else {
780 pmcraid_info("reset is already in progress\n");
781
782 if (pinstance->reset_cmd != cmd) {
783 /* This command should have been given to IOA, this
784 * command will be completed by fail_outstanding_cmds
785 * anyway
786 */
787 pmcraid_err("cmd is pending but reset in progress\n");
788 }
789
790 /* If this command was being used as part of the reset
791 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
792 * causes fail_outstanding_commands not to return the command
793 * block back to free pool
794 */
795 if (cmd == pinstance->reset_cmd)
796 cmd->cmd_done = pmcraid_ioa_reset;
797 }
798
799 /* Notify apps of important IOA bringup/bringdown sequences */
800 if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
801 pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
802 pmcraid_notify_ioastate(pinstance,
803 PMC_DEVICE_EVENT_RESET_START);
804
805 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
806 scsi_block_requests(pinstance->host);
807 pmcraid_reset_alert(cmd);
808 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
809}
810
811/**
812 * pmcraid_internal_done - completion routine for internally generated cmds
813 *
814 * @cmd: command that got response from IOA
815 *
816 * Return Value:
817 * none
818 */
819static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
820{
821 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
822 cmd->ioa_cb->ioarcb.cdb[0],
823 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
824
825 /* Some of the internal commands are sent with callers blocking for the
826 * response. Same will be indicated as part of cmd->completion_req
827 * field. Response path needs to wake up any waiters waiting for cmd
828 * completion if this flag is set.
829 */
830 if (cmd->completion_req) {
831 cmd->completion_req = 0;
832 complete(&cmd->wait_for_completion);
833 }
834
835 /* most of the internal commands are completed by caller itself, so
836 * no need to return the command block back to free pool until we are
837 * required to do so (e.g once done with initialization).
838 */
839 if (cmd->release) {
840 cmd->release = 0;
841 pmcraid_return_cmd(cmd);
842 }
843}
844
845/**
846 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
847 *
848 * @cmd: command that got response from IOA
849 *
850 * This routine is called after driver re-reads configuration table due to a
851 * lost CCN. It returns the command block back to free pool and schedules
852 * worker thread to add/delete devices into the system.
853 *
854 * Return Value:
855 * none
856 */
857static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
858{
859 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
860 cmd->ioa_cb->ioarcb.cdb[0],
861 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
862
863 if (cmd->release) {
864 cmd->release = 0;
865 pmcraid_return_cmd(cmd);
866 }
867 pmcraid_info("scheduling worker for config table reinitialization\n");
868 schedule_work(&cmd->drv_inst->worker_q);
869}
870
871/**
872 * pmcraid_erp_done - Process completion of SCSI error response from device
873 * @cmd: pmcraid_command
874 *
875 * This function copies the sense buffer into the scsi_cmd struct and completes
876 * scsi_cmd by calling scsi_done function.
877 *
878 * Return value:
879 * none
880 */
881static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
882{
883 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
884 struct pmcraid_instance *pinstance = cmd->drv_inst;
885 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
886
887 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
888 scsi_cmd->result |= (DID_ERROR << 16);
889 scmd_printk(KERN_INFO, scsi_cmd,
890 "command CDB[0] = %x failed with IOASC: 0x%08X\n",
891 cmd->ioa_cb->ioarcb.cdb[0], ioasc);
892 }
893
894 /* if we had allocated sense buffers for request sense, copy the sense
895 * release the buffers
896 */
897 if (cmd->sense_buffer != NULL) {
898 memcpy(scsi_cmd->sense_buffer,
899 cmd->sense_buffer,
900 SCSI_SENSE_BUFFERSIZE);
901 pci_free_consistent(pinstance->pdev,
902 SCSI_SENSE_BUFFERSIZE,
903 cmd->sense_buffer, cmd->sense_buffer_dma);
904 cmd->sense_buffer = NULL;
905 cmd->sense_buffer_dma = 0;
906 }
907
908 scsi_dma_unmap(scsi_cmd);
909 pmcraid_return_cmd(cmd);
910 scsi_cmd->scsi_done(scsi_cmd);
911}
912
913/**
914 * pmcraid_fire_command - sends an IOA command to adapter
915 *
916 * This function adds the given block into pending command list
917 * and returns without waiting
918 *
919 * @cmd : command to be sent to the device
920 *
921 * Return Value
922 * None
923 */
924static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
925{
926 struct pmcraid_instance *pinstance = cmd->drv_inst;
927 unsigned long lock_flags;
928
929 /* Add this command block to pending cmd pool. We do this prior to
930 * writting IOARCB to ioarrin because IOA might complete the command
931 * by the time we are about to add it to the list. Response handler
932 * (isr/tasklet) looks for cmd block in the pending pending list.
933 */
934 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
935 list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
936 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
937 atomic_inc(&pinstance->outstanding_cmds);
938
939 /* driver writes lower 32-bit value of IOARCB address only */
940 mb();
941 iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
942 pinstance->ioarrin);
943}
944
945/**
946 * pmcraid_send_cmd - fires a command to IOA
947 *
948 * This function also sets up timeout function, and command completion
949 * function
950 *
951 * @cmd: pointer to the command block to be fired to IOA
952 * @cmd_done: command completion function, called once IOA responds
953 * @timeout: timeout to wait for this command completion
954 * @timeout_func: timeout handler
955 *
956 * Return value
957 * none
958 */
959static void pmcraid_send_cmd(
960 struct pmcraid_cmd *cmd,
961 void (*cmd_done) (struct pmcraid_cmd *),
962 unsigned long timeout,
963 void (*timeout_func) (struct pmcraid_cmd *)
964)
965{
966 /* initialize done function */
967 cmd->cmd_done = cmd_done;
968
969 if (timeout_func) {
970 /* setup timeout handler */
971 cmd->timer.data = (unsigned long)cmd;
972 cmd->timer.expires = jiffies + timeout;
973 cmd->timer.function = (void (*)(unsigned long))timeout_func;
974 add_timer(&cmd->timer);
975 }
976
977 /* fire the command to IOA */
978 _pmcraid_fire_command(cmd);
979}
980
981/**
982 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
983 * @cmd: pointer to the command block used for sending IOA shutdown command
984 *
985 * Return value
986 * None
987 */
988static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
989{
990 struct pmcraid_instance *pinstance = cmd->drv_inst;
991 unsigned long lock_flags;
992
993 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
994 pmcraid_ioa_reset(cmd);
995 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
996}
997
998/**
999 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
1000 *
1001 * @cmd: pointer to the command block used as part of reset sequence
1002 *
1003 * Return Value
1004 * None
1005 */
1006static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
1007{
1008 pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
1009 cmd->ioa_cb->ioarcb.cdb[0],
1010 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1011
1012 /* Note that commands sent during reset require next command to be sent
1013 * to IOA. Hence reinit the done function as well as timeout function
1014 */
1015 pmcraid_reinit_cmdblk(cmd);
1016 cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
1017 cmd->ioa_cb->ioarcb.resource_handle =
1018 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1019 cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
1020 cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
1021
1022 /* fire shutdown command to hardware. */
1023 pmcraid_info("firing normal shutdown command (%d) to IOA\n",
1024 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
1025
1026 pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
1027
1028 pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
1029 PMCRAID_SHUTDOWN_TIMEOUT,
1030 pmcraid_timeout_handler);
1031}
1032
1033/**
1034 * pmcraid_get_fwversion_done - completion function for get_fwversion
1035 *
1036 * @cmd: pointer to command block used to send INQUIRY command
1037 *
1038 * Return Value
1039 * none
1040 */
1041static void pmcraid_querycfg(struct pmcraid_cmd *);
1042
1043static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
1044{
1045 struct pmcraid_instance *pinstance = cmd->drv_inst;
1046 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1047 unsigned long lock_flags;
1048
1049 /* configuration table entry size depends on firmware version. If fw
1050 * version is not known, it is not possible to interpret IOA config
1051 * table
1052 */
1053 if (ioasc) {
1054 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
1055 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1056 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1057 pmcraid_reset_alert(cmd);
1058 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1059 } else {
1060 pmcraid_querycfg(cmd);
1061 }
1062}
1063
1064/**
1065 * pmcraid_get_fwversion - reads firmware version information
1066 *
1067 * @cmd: pointer to command block used to send INQUIRY command
1068 *
1069 * Return Value
1070 * none
1071 */
1072static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1073{
1074 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1075 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
1076 struct pmcraid_instance *pinstance = cmd->drv_inst;
1077 u16 data_size = sizeof(struct pmcraid_inquiry_data);
1078
1079 pmcraid_reinit_cmdblk(cmd);
1080 ioarcb->request_type = REQ_TYPE_SCSI;
1081 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1082 ioarcb->cdb[0] = INQUIRY;
1083 ioarcb->cdb[1] = 1;
1084 ioarcb->cdb[2] = 0xD0;
1085 ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1086 ioarcb->cdb[4] = data_size & 0xFF;
1087
1088 /* Since entire inquiry data it can be part of IOARCB itself
1089 */
1090 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1091 offsetof(struct pmcraid_ioarcb,
1092 add_data.u.ioadl[0]));
1093 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1094 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
1095
1096 ioarcb->request_flags0 |= NO_LINK_DESCS;
1097 ioarcb->data_transfer_length = cpu_to_le32(data_size);
1098 ioadl = &(ioarcb->add_data.u.ioadl[0]);
1099 ioadl->flags = IOADL_FLAGS_LAST_DESC;
1100 ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1101 ioadl->data_len = cpu_to_le32(data_size);
1102
1103 pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1104 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1105}
1106
1107/**
1108 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1109 * @cmd: pointer to command block to be used for identify hrrq
1110 *
1111 * Return Value
1112 * none
1113 */
1114static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1115{
1116 struct pmcraid_instance *pinstance = cmd->drv_inst;
1117 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1118 int index = cmd->hrrq_index;
1119 __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1120 u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1121 void (*done_function)(struct pmcraid_cmd *);
1122
1123 pmcraid_reinit_cmdblk(cmd);
1124 cmd->hrrq_index = index + 1;
1125
1126 if (cmd->hrrq_index < pinstance->num_hrrq) {
1127 done_function = pmcraid_identify_hrrq;
1128 } else {
1129 cmd->hrrq_index = 0;
1130 done_function = pmcraid_get_fwversion;
1131 }
1132
1133 /* Initialize ioarcb */
1134 ioarcb->request_type = REQ_TYPE_IOACMD;
1135 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1136
1137 /* initialize the hrrq number where IOA will respond to this command */
1138 ioarcb->hrrq_id = index;
1139 ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1140 ioarcb->cdb[1] = index;
1141
1142 /* IOA expects 64-bit pci address to be written in B.E format
1143 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1144 */
1145 pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1146 hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1147
1148 memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1149 memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1150
1151 /* Subsequent commands require HRRQ identification to be successful.
1152 * Note that this gets called even during reset from SCSI mid-layer
1153 * or tasklet
1154 */
1155 pmcraid_send_cmd(cmd, done_function,
1156 PMCRAID_INTERNAL_TIMEOUT,
1157 pmcraid_timeout_handler);
1158}
1159
1160static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1161static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1162
1163/**
1164 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1165 *
1166 * @cmd: initialized command block pointer
1167 *
1168 * Return Value
1169 * none
1170 */
1171static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1172{
1173 if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1174 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1175 else
1176 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1177
1178 pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1179}
1180
1181/**
1182 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1183 *
1184 * @pinstance: pointer to adapter instance structure
1185 * @type: HCAM type
1186 *
1187 * Return Value
1188 * pointer to initialized pmcraid_cmd structure or NULL
1189 */
1190static struct pmcraid_cmd *pmcraid_init_hcam
1191(
1192 struct pmcraid_instance *pinstance,
1193 u8 type
1194)
1195{
1196 struct pmcraid_cmd *cmd;
1197 struct pmcraid_ioarcb *ioarcb;
1198 struct pmcraid_ioadl_desc *ioadl;
1199 struct pmcraid_hostrcb *hcam;
1200 void (*cmd_done) (struct pmcraid_cmd *);
1201 dma_addr_t dma;
1202 int rcb_size;
1203
1204 cmd = pmcraid_get_free_cmd(pinstance);
1205
1206 if (!cmd) {
1207 pmcraid_err("no free command blocks for hcam\n");
1208 return cmd;
1209 }
1210
1211 if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1212 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1213 cmd_done = pmcraid_process_ccn;
1214 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1215 hcam = &pinstance->ccn;
1216 } else {
1217 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1218 cmd_done = pmcraid_process_ldn;
1219 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1220 hcam = &pinstance->ldn;
1221 }
1222
1223 /* initialize command pointer used for HCAM registration */
1224 hcam->cmd = cmd;
1225
1226 ioarcb = &cmd->ioa_cb->ioarcb;
1227 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1228 offsetof(struct pmcraid_ioarcb,
1229 add_data.u.ioadl[0]));
1230 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1231 ioadl = ioarcb->add_data.u.ioadl;
1232
1233 /* Initialize ioarcb */
1234 ioarcb->request_type = REQ_TYPE_HCAM;
1235 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1236 ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1237 ioarcb->cdb[1] = type;
1238 ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1239 ioarcb->cdb[8] = (rcb_size) & 0xFF;
1240
1241 ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1242
1243 ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1244 ioadl[0].data_len = cpu_to_le32(rcb_size);
1245 ioadl[0].address = cpu_to_le32(dma);
1246
1247 cmd->cmd_done = cmd_done;
1248 return cmd;
1249}
1250
1251/**
1252 * pmcraid_send_hcam - Send an HCAM to IOA
1253 * @pinstance: ioa config struct
1254 * @type: HCAM type
1255 *
1256 * This function will send a Host Controlled Async command to IOA.
1257 *
1258 * Return value:
1259 * none
1260 */
1261static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1262{
1263 struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1264 pmcraid_send_hcam_cmd(cmd);
1265}
1266
1267
1268/**
1269 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1270 *
1271 * @cmd: pointer to cmd that is used as cancelling command
1272 * @cmd_to_cancel: pointer to the command that needs to be cancelled
1273 */
1274static void pmcraid_prepare_cancel_cmd(
1275 struct pmcraid_cmd *cmd,
1276 struct pmcraid_cmd *cmd_to_cancel
1277)
1278{
1279 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1280 __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
1281
1282 /* Get the resource handle to where the command to be aborted has been
1283 * sent.
1284 */
1285 ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1286 ioarcb->request_type = REQ_TYPE_IOACMD;
1287 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1288 ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1289
1290 /* IOARCB address of the command to be cancelled is given in
1291 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1292 * IOARCB address are not masked.
1293 */
1294 ioarcb_addr = cpu_to_be64(ioarcb_addr);
1295 memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1296}
1297
1298/**
1299 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1300 *
1301 * @cmd: command to be used as cancelling command
1302 * @type: HCAM type
1303 * @cmd_done: op done function for the cancelling command
1304 */
1305static void pmcraid_cancel_hcam(
1306 struct pmcraid_cmd *cmd,
1307 u8 type,
1308 void (*cmd_done) (struct pmcraid_cmd *)
1309)
1310{
1311 struct pmcraid_instance *pinstance;
1312 struct pmcraid_hostrcb *hcam;
1313
1314 pinstance = cmd->drv_inst;
1315 hcam = (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1316 &pinstance->ldn : &pinstance->ccn;
1317
1318 /* prepare for cancelling previous hcam command. If the HCAM is
1319 * currently not pending with IOA, we would have hcam->cmd as non-null
1320 */
1321 if (hcam->cmd == NULL)
1322 return;
1323
1324 pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1325
1326 /* writing to IOARRIN must be protected by host_lock, as mid-layer
1327 * schedule queuecommand while we are doing this
1328 */
1329 pmcraid_send_cmd(cmd, cmd_done,
1330 PMCRAID_INTERNAL_TIMEOUT,
1331 pmcraid_timeout_handler);
1332}
1333
1334/**
1335 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1336 *
1337 * @cmd: command block to be used for cancelling the HCAM
1338 */
1339static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1340{
1341 pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1342 cmd->ioa_cb->ioarcb.cdb[0],
1343 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1344
1345 pmcraid_reinit_cmdblk(cmd);
1346
1347 pmcraid_cancel_hcam(cmd,
1348 PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1349 pmcraid_ioa_shutdown);
1350}
1351
1352/**
1353 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1354 *
1355 * @cmd: command block to be used for cancelling the HCAM
1356 */
1357static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1358{
1359 pmcraid_cancel_hcam(cmd,
1360 PMCRAID_HCAM_CODE_LOG_DATA,
1361 pmcraid_cancel_ccn);
1362}
1363
1364/**
1365 * pmcraid_expose_resource - check if the resource can be exposed to OS
1366 *
1367 * @fw_version: firmware version code
1368 * @cfgte: pointer to configuration table entry of the resource
1369 *
1370 * Return value:
1371 * true if resource can be added to midlayer, false(0) otherwise
1372 */
1373static int pmcraid_expose_resource(u16 fw_version,
1374 struct pmcraid_config_table_entry *cfgte)
1375{
1376 int retval = 0;
1377
1378 if (cfgte->resource_type == RES_TYPE_VSET) {
1379 if (fw_version <= PMCRAID_FW_VERSION_1)
1380 retval = ((cfgte->unique_flags1 & 0x80) == 0);
1381 else
1382 retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1383 (cfgte->unique_flags1 & 0x80) == 0);
1384
1385 } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1386 retval = (RES_BUS(cfgte->resource_address) !=
1387 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1388 return retval;
1389}
1390
1391/* attributes supported by pmcraid_event_family */
1392enum {
1393 PMCRAID_AEN_ATTR_UNSPEC,
1394 PMCRAID_AEN_ATTR_EVENT,
1395 __PMCRAID_AEN_ATTR_MAX,
1396};
1397#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1398
1399/* commands supported by pmcraid_event_family */
1400enum {
1401 PMCRAID_AEN_CMD_UNSPEC,
1402 PMCRAID_AEN_CMD_EVENT,
1403 __PMCRAID_AEN_CMD_MAX,
1404};
1405#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1406
1407static struct genl_multicast_group pmcraid_mcgrps[] = {
1408 { .name = "events", /* not really used - see ID discussion below */ },
1409};
1410
1411static struct genl_family pmcraid_event_family = {
1412 /*
1413 * Due to prior multicast group abuse (the code having assumed that
1414 * the family ID can be used as a multicast group ID) we need to
1415 * statically allocate a family (and thus group) ID.
1416 */
1417 .id = GENL_ID_PMCRAID,
1418 .name = "pmcraid",
1419 .version = 1,
1420 .maxattr = PMCRAID_AEN_ATTR_MAX,
1421 .mcgrps = pmcraid_mcgrps,
1422 .n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
1423};
1424
1425/**
1426 * pmcraid_netlink_init - registers pmcraid_event_family
1427 *
1428 * Return value:
1429 * 0 if the pmcraid_event_family is successfully registered
1430 * with netlink generic, non-zero otherwise
1431 */
1432static int pmcraid_netlink_init(void)
1433{
1434 int result;
1435
1436 result = genl_register_family(&pmcraid_event_family);
1437
1438 if (result)
1439 return result;
1440
1441 pmcraid_info("registered NETLINK GENERIC group: %d\n",
1442 pmcraid_event_family.id);
1443
1444 return result;
1445}
1446
1447/**
1448 * pmcraid_netlink_release - unregisters pmcraid_event_family
1449 *
1450 * Return value:
1451 * none
1452 */
1453static void pmcraid_netlink_release(void)
1454{
1455 genl_unregister_family(&pmcraid_event_family);
1456}
1457
1458/**
1459 * pmcraid_notify_aen - sends event msg to user space application
1460 * @pinstance: pointer to adapter instance structure
1461 * @type: HCAM type
1462 *
1463 * Return value:
1464 * 0 if success, error value in case of any failure.
1465 */
1466static int pmcraid_notify_aen(
1467 struct pmcraid_instance *pinstance,
1468 struct pmcraid_aen_msg *aen_msg,
1469 u32 data_size
1470)
1471{
1472 struct sk_buff *skb;
1473 void *msg_header;
1474 u32 total_size, nla_genl_hdr_total_size;
1475 int result;
1476
1477 aen_msg->hostno = (pinstance->host->unique_id << 16 |
1478 MINOR(pinstance->cdev.dev));
1479 aen_msg->length = data_size;
1480
1481 data_size += sizeof(*aen_msg);
1482
1483 total_size = nla_total_size(data_size);
1484 /* Add GENL_HDR to total_size */
1485 nla_genl_hdr_total_size =
1486 (total_size + (GENL_HDRLEN +
1487 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1488 + NLMSG_HDRLEN);
1489 skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1490
1491
1492 if (!skb) {
1493 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1494 total_size);
1495 return -ENOMEM;
1496 }
1497
1498 /* add the genetlink message header */
1499 msg_header = genlmsg_put(skb, 0, 0,
1500 &pmcraid_event_family, 0,
1501 PMCRAID_AEN_CMD_EVENT);
1502 if (!msg_header) {
1503 pmcraid_err("failed to copy command details\n");
1504 nlmsg_free(skb);
1505 return -ENOMEM;
1506 }
1507
1508 result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1509
1510 if (result) {
1511 pmcraid_err("failed to copy AEN attribute data\n");
1512 nlmsg_free(skb);
1513 return -EINVAL;
1514 }
1515
1516 /* send genetlink multicast message to notify appplications */
1517 result = genlmsg_end(skb, msg_header);
1518
1519 if (result < 0) {
1520 pmcraid_err("genlmsg_end failed\n");
1521 nlmsg_free(skb);
1522 return result;
1523 }
1524
1525 result = genlmsg_multicast(&pmcraid_event_family, skb,
1526 0, 0, GFP_ATOMIC);
1527
1528 /* If there are no listeners, genlmsg_multicast may return non-zero
1529 * value.
1530 */
1531 if (result)
1532 pmcraid_info("error (%x) sending aen event message\n", result);
1533 return result;
1534}
1535
1536/**
1537 * pmcraid_notify_ccn - notifies about CCN event msg to user space
1538 * @pinstance: pointer adapter instance structure
1539 *
1540 * Return value:
1541 * 0 if success, error value in case of any failure
1542 */
1543static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1544{
1545 return pmcraid_notify_aen(pinstance,
1546 pinstance->ccn.msg,
1547 pinstance->ccn.hcam->data_len +
1548 sizeof(struct pmcraid_hcam_hdr));
1549}
1550
1551/**
1552 * pmcraid_notify_ldn - notifies about CCN event msg to user space
1553 * @pinstance: pointer adapter instance structure
1554 *
1555 * Return value:
1556 * 0 if success, error value in case of any failure
1557 */
1558static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1559{
1560 return pmcraid_notify_aen(pinstance,
1561 pinstance->ldn.msg,
1562 pinstance->ldn.hcam->data_len +
1563 sizeof(struct pmcraid_hcam_hdr));
1564}
1565
1566/**
1567 * pmcraid_notify_ioastate - sends IOA state event msg to user space
1568 * @pinstance: pointer adapter instance structure
1569 * @evt: controller state event to be sent
1570 *
1571 * Return value:
1572 * 0 if success, error value in case of any failure
1573 */
1574static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1575{
1576 pinstance->scn.ioa_state = evt;
1577 pmcraid_notify_aen(pinstance,
1578 &pinstance->scn.msg,
1579 sizeof(u32));
1580}
1581
1582/**
1583 * pmcraid_handle_config_change - Handle a config change from the adapter
1584 * @pinstance: pointer to per adapter instance structure
1585 *
1586 * Return value:
1587 * none
1588 */
1589
1590static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1591{
1592 struct pmcraid_config_table_entry *cfg_entry;
1593 struct pmcraid_hcam_ccn *ccn_hcam;
1594 struct pmcraid_cmd *cmd;
1595 struct pmcraid_cmd *cfgcmd;
1596 struct pmcraid_resource_entry *res = NULL;
1597 unsigned long lock_flags;
1598 unsigned long host_lock_flags;
1599 u32 new_entry = 1;
1600 u32 hidden_entry = 0;
1601 u16 fw_version;
1602 int rc;
1603
1604 ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1605 cfg_entry = &ccn_hcam->cfg_entry;
1606 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1607
1608 pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1609 res: %x:%x:%x:%x\n",
1610 pinstance->ccn.hcam->ilid,
1611 pinstance->ccn.hcam->op_code,
1612 ((pinstance->ccn.hcam->timestamp1) |
1613 ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
1614 pinstance->ccn.hcam->notification_type,
1615 pinstance->ccn.hcam->notification_lost,
1616 pinstance->ccn.hcam->flags,
1617 pinstance->host->unique_id,
1618 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1619 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1620 RES_BUS(cfg_entry->resource_address)),
1621 RES_IS_VSET(*cfg_entry) ?
1622 (fw_version <= PMCRAID_FW_VERSION_1 ?
1623 cfg_entry->unique_flags1 :
1624 cfg_entry->array_id & 0xFF) :
1625 RES_TARGET(cfg_entry->resource_address),
1626 RES_LUN(cfg_entry->resource_address));
1627
1628
1629 /* If this HCAM indicates a lost notification, read the config table */
1630 if (pinstance->ccn.hcam->notification_lost) {
1631 cfgcmd = pmcraid_get_free_cmd(pinstance);
1632 if (cfgcmd) {
1633 pmcraid_info("lost CCN, reading config table\b");
1634 pinstance->reinit_cfg_table = 1;
1635 pmcraid_querycfg(cfgcmd);
1636 } else {
1637 pmcraid_err("lost CCN, no free cmd for querycfg\n");
1638 }
1639 goto out_notify_apps;
1640 }
1641
1642 /* If this resource is not going to be added to mid-layer, just notify
1643 * applications and return. If this notification is about hiding a VSET
1644 * resource, check if it was exposed already.
1645 */
1646 if (pinstance->ccn.hcam->notification_type ==
1647 NOTIFICATION_TYPE_ENTRY_CHANGED &&
1648 cfg_entry->resource_type == RES_TYPE_VSET) {
1649
1650 if (fw_version <= PMCRAID_FW_VERSION_1)
1651 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1652 else
1653 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1654
1655 } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1656 goto out_notify_apps;
1657 }
1658
1659 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1660 list_for_each_entry(res, &pinstance->used_res_q, queue) {
1661 rc = memcmp(&res->cfg_entry.resource_address,
1662 &cfg_entry->resource_address,
1663 sizeof(cfg_entry->resource_address));
1664 if (!rc) {
1665 new_entry = 0;
1666 break;
1667 }
1668 }
1669
1670 if (new_entry) {
1671
1672 if (hidden_entry) {
1673 spin_unlock_irqrestore(&pinstance->resource_lock,
1674 lock_flags);
1675 goto out_notify_apps;
1676 }
1677
1678 /* If there are more number of resources than what driver can
1679 * manage, do not notify the applications about the CCN. Just
1680 * ignore this notifications and re-register the same HCAM
1681 */
1682 if (list_empty(&pinstance->free_res_q)) {
1683 spin_unlock_irqrestore(&pinstance->resource_lock,
1684 lock_flags);
1685 pmcraid_err("too many resources attached\n");
1686 spin_lock_irqsave(pinstance->host->host_lock,
1687 host_lock_flags);
1688 pmcraid_send_hcam(pinstance,
1689 PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1690 spin_unlock_irqrestore(pinstance->host->host_lock,
1691 host_lock_flags);
1692 return;
1693 }
1694
1695 res = list_entry(pinstance->free_res_q.next,
1696 struct pmcraid_resource_entry, queue);
1697
1698 list_del(&res->queue);
1699 res->scsi_dev = NULL;
1700 res->reset_progress = 0;
1701 list_add_tail(&res->queue, &pinstance->used_res_q);
1702 }
1703
1704 memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1705
1706 if (pinstance->ccn.hcam->notification_type ==
1707 NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1708 if (res->scsi_dev) {
1709 if (fw_version <= PMCRAID_FW_VERSION_1)
1710 res->cfg_entry.unique_flags1 &= 0x7F;
1711 else
1712 res->cfg_entry.array_id &= 0xFF;
1713 res->change_detected = RES_CHANGE_DEL;
1714 res->cfg_entry.resource_handle =
1715 PMCRAID_INVALID_RES_HANDLE;
1716 schedule_work(&pinstance->worker_q);
1717 } else {
1718 /* This may be one of the non-exposed resources */
1719 list_move_tail(&res->queue, &pinstance->free_res_q);
1720 }
1721 } else if (!res->scsi_dev) {
1722 res->change_detected = RES_CHANGE_ADD;
1723 schedule_work(&pinstance->worker_q);
1724 }
1725 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1726
1727out_notify_apps:
1728
1729 /* Notify configuration changes to registered applications.*/
1730 if (!pmcraid_disable_aen)
1731 pmcraid_notify_ccn(pinstance);
1732
1733 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1734 if (cmd)
1735 pmcraid_send_hcam_cmd(cmd);
1736}
1737
1738/**
1739 * pmcraid_get_error_info - return error string for an ioasc
1740 * @ioasc: ioasc code
1741 * Return Value
1742 * none
1743 */
1744static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1745{
1746 int i;
1747 for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1748 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1749 return &pmcraid_ioasc_error_table[i];
1750 }
1751 return NULL;
1752}
1753
1754/**
1755 * pmcraid_ioasc_logger - log IOASC information based user-settings
1756 * @ioasc: ioasc code
1757 * @cmd: pointer to command that resulted in 'ioasc'
1758 */
1759void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1760{
1761 struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1762
1763 if (error_info == NULL ||
1764 cmd->drv_inst->current_log_level < error_info->log_level)
1765 return;
1766
1767 /* log the error string */
1768 pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1769 cmd->ioa_cb->ioarcb.cdb[0],
1770 cmd->ioa_cb->ioarcb.resource_handle,
1771 le32_to_cpu(ioasc), error_info->error_string);
1772}
1773
1774/**
1775 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1776 *
1777 * @pinstance: pointer to per adapter instance structure
1778 *
1779 * Return value:
1780 * none
1781 */
1782static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1783{
1784 struct pmcraid_hcam_ldn *hcam_ldn;
1785 u32 ioasc;
1786
1787 hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1788
1789 pmcraid_info
1790 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1791 pinstance->ldn.hcam->ilid,
1792 pinstance->ldn.hcam->op_code,
1793 pinstance->ldn.hcam->notification_type,
1794 pinstance->ldn.hcam->notification_lost,
1795 pinstance->ldn.hcam->flags,
1796 pinstance->ldn.hcam->overlay_id);
1797
1798 /* log only the errors, no need to log informational log entries */
1799 if (pinstance->ldn.hcam->notification_type !=
1800 NOTIFICATION_TYPE_ERROR_LOG)
1801 return;
1802
1803 if (pinstance->ldn.hcam->notification_lost ==
1804 HOSTRCB_NOTIFICATIONS_LOST)
1805 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1806
1807 ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1808
1809 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1810 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1811 dev_info(&pinstance->pdev->dev,
1812 "UnitAttention due to IOA Bus Reset\n");
1813 scsi_report_bus_reset(
1814 pinstance->host,
1815 RES_BUS(hcam_ldn->error_log.fd_ra));
1816 }
1817
1818 return;
1819}
1820
1821/**
1822 * pmcraid_process_ccn - Op done function for a CCN.
1823 * @cmd: pointer to command struct
1824 *
1825 * This function is the op done function for a configuration
1826 * change notification
1827 *
1828 * Return value:
1829 * none
1830 */
1831static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1832{
1833 struct pmcraid_instance *pinstance = cmd->drv_inst;
1834 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1835 unsigned long lock_flags;
1836
1837 pinstance->ccn.cmd = NULL;
1838 pmcraid_return_cmd(cmd);
1839
1840 /* If driver initiated IOA reset happened while this hcam was pending
1841 * with IOA, or IOA bringdown sequence is in progress, no need to
1842 * re-register the hcam
1843 */
1844 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1845 atomic_read(&pinstance->ccn.ignore) == 1) {
1846 return;
1847 } else if (ioasc) {
1848 dev_info(&pinstance->pdev->dev,
1849 "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1850 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1851 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1852 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1853 } else {
1854 pmcraid_handle_config_change(pinstance);
1855 }
1856}
1857
1858/**
1859 * pmcraid_process_ldn - op done function for an LDN
1860 * @cmd: pointer to command block
1861 *
1862 * Return value
1863 * none
1864 */
1865static void pmcraid_initiate_reset(struct pmcraid_instance *);
1866static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1867
1868static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1869{
1870 struct pmcraid_instance *pinstance = cmd->drv_inst;
1871 struct pmcraid_hcam_ldn *ldn_hcam =
1872 (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1873 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1874 u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1875 unsigned long lock_flags;
1876
1877 /* return the command block back to freepool */
1878 pinstance->ldn.cmd = NULL;
1879 pmcraid_return_cmd(cmd);
1880
1881 /* If driver initiated IOA reset happened while this hcam was pending
1882 * with IOA, no need to re-register the hcam as reset engine will do it
1883 * once reset sequence is complete
1884 */
1885 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1886 atomic_read(&pinstance->ccn.ignore) == 1) {
1887 return;
1888 } else if (!ioasc) {
1889 pmcraid_handle_error_log(pinstance);
1890 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1891 spin_lock_irqsave(pinstance->host->host_lock,
1892 lock_flags);
1893 pmcraid_initiate_reset(pinstance);
1894 spin_unlock_irqrestore(pinstance->host->host_lock,
1895 lock_flags);
1896 return;
1897 }
1898 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1899 pinstance->timestamp_error = 1;
1900 pmcraid_set_timestamp(cmd);
1901 }
1902 } else {
1903 dev_info(&pinstance->pdev->dev,
1904 "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1905 }
1906 /* send netlink message for HCAM notification if enabled */
1907 if (!pmcraid_disable_aen)
1908 pmcraid_notify_ldn(pinstance);
1909
1910 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1911 if (cmd)
1912 pmcraid_send_hcam_cmd(cmd);
1913}
1914
1915/**
1916 * pmcraid_register_hcams - register HCAMs for CCN and LDN
1917 *
1918 * @pinstance: pointer per adapter instance structure
1919 *
1920 * Return Value
1921 * none
1922 */
1923static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1924{
1925 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1926 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1927}
1928
1929/**
1930 * pmcraid_unregister_hcams - cancel HCAMs registered already
1931 * @cmd: pointer to command used as part of reset sequence
1932 */
1933static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1934{
1935 struct pmcraid_instance *pinstance = cmd->drv_inst;
1936
1937 /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1938 * handling hcam response though it is not necessary. In order to
1939 * prevent this, set 'ignore', so that bring-down sequence doesn't
1940 * re-send any more hcams
1941 */
1942 atomic_set(&pinstance->ccn.ignore, 1);
1943 atomic_set(&pinstance->ldn.ignore, 1);
1944
1945 /* If adapter reset was forced as part of runtime reset sequence,
1946 * start the reset sequence. Reset will be triggered even in case
1947 * IOA unit_check.
1948 */
1949 if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1950 pinstance->ioa_unit_check) {
1951 pinstance->force_ioa_reset = 0;
1952 pinstance->ioa_unit_check = 0;
1953 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1954 pmcraid_reset_alert(cmd);
1955 return;
1956 }
1957
1958 /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1959 * one after the other. So CCN cancellation will be triggered by
1960 * pmcraid_cancel_ldn itself.
1961 */
1962 pmcraid_cancel_ldn(cmd);
1963}
1964
1965/**
1966 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1967 * @pinstance: pointer to adapter instance structure
1968 * Return Value
1969 * 1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1970 */
1971static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1972
1973static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1974{
1975 u32 intrs;
1976
1977 pmcraid_reinit_buffers(pinstance);
1978 intrs = pmcraid_read_interrupts(pinstance);
1979
1980 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1981
1982 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1983 if (!pinstance->interrupt_mode) {
1984 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1985 pinstance->int_regs.
1986 ioa_host_interrupt_mask_reg);
1987 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1988 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1989 }
1990 return 1;
1991 } else {
1992 return 0;
1993 }
1994}
1995
1996/**
1997 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1998 * @cmd : pointer to reset command block
1999 *
2000 * Return Value
2001 * none
2002 */
2003static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
2004{
2005 struct pmcraid_instance *pinstance = cmd->drv_inst;
2006 u32 int_reg;
2007 u32 doorbell;
2008
2009 /* There will be an interrupt when Transition to Operational bit is
2010 * set so tasklet would execute next reset task. The timeout handler
2011 * would re-initiate a reset
2012 */
2013 cmd->cmd_done = pmcraid_ioa_reset;
2014 cmd->timer.data = (unsigned long)cmd;
2015 cmd->timer.expires = jiffies +
2016 msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
2017 cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
2018
2019 if (!timer_pending(&cmd->timer))
2020 add_timer(&cmd->timer);
2021
2022 /* Enable destructive diagnostics on IOA if it is not yet in
2023 * operational state
2024 */
2025 doorbell = DOORBELL_RUNTIME_RESET |
2026 DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
2027
2028 /* Since we do RESET_ALERT and Start BIST we have to again write
2029 * MSIX Doorbell to indicate the interrupt mode
2030 */
2031 if (pinstance->interrupt_mode) {
2032 iowrite32(DOORBELL_INTR_MODE_MSIX,
2033 pinstance->int_regs.host_ioa_interrupt_reg);
2034 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
2035 }
2036
2037 iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
2038 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2039 int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
2040
2041 pmcraid_info("Waiting for IOA to become operational %x:%x\n",
2042 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2043 int_reg);
2044}
2045
2046/**
2047 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
2048 *
2049 * @pinstance: pointer to adapter instance structure
2050 *
2051 * Return Value
2052 * none
2053 */
2054static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
2055{
2056 pmcraid_info("%s is not yet implemented\n", __func__);
2057}
2058
2059/**
2060 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
2061 * @pinstance: pointer to adapter instance structure
2062 *
2063 * This function fails all outstanding ops. If they are submitted to IOA
2064 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
2065 * otherwise just completes the commands and returns the cmd blocks to free
2066 * pool.
2067 *
2068 * Return value:
2069 * none
2070 */
2071static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
2072{
2073 struct pmcraid_cmd *cmd, *temp;
2074 unsigned long lock_flags;
2075
2076 /* pending command list is protected by pending_pool_lock. Its
2077 * traversal must be done as within this lock
2078 */
2079 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2080 list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
2081 free_list) {
2082 list_del(&cmd->free_list);
2083 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2084 lock_flags);
2085 cmd->ioa_cb->ioasa.ioasc =
2086 cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
2087 cmd->ioa_cb->ioasa.ilid =
2088 cpu_to_be32(PMCRAID_DRIVER_ILID);
2089
2090 /* In case the command timer is still running */
2091 del_timer(&cmd->timer);
2092
2093 /* If this is an IO command, complete it by invoking scsi_done
2094 * function. If this is one of the internal commands other
2095 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2096 * complete it
2097 */
2098 if (cmd->scsi_cmd) {
2099
2100 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2101 __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2102
2103 scsi_cmd->result |= DID_ERROR << 16;
2104
2105 scsi_dma_unmap(scsi_cmd);
2106 pmcraid_return_cmd(cmd);
2107
2108 pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2109 le32_to_cpu(resp) >> 2,
2110 cmd->ioa_cb->ioarcb.cdb[0],
2111 scsi_cmd->result);
2112 scsi_cmd->scsi_done(scsi_cmd);
2113 } else if (cmd->cmd_done == pmcraid_internal_done ||
2114 cmd->cmd_done == pmcraid_erp_done) {
2115 cmd->cmd_done(cmd);
2116 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2117 cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2118 pmcraid_return_cmd(cmd);
2119 }
2120
2121 atomic_dec(&pinstance->outstanding_cmds);
2122 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2123 }
2124
2125 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2126}
2127
2128/**
2129 * pmcraid_ioa_reset - Implementation of IOA reset logic
2130 *
2131 * @cmd: pointer to the cmd block to be used for entire reset process
2132 *
2133 * This function executes most of the steps required for IOA reset. This gets
2134 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2135 * 'eh_' thread. Access to variables used for controlling the reset sequence is
2136 * synchronized using host lock. Various functions called during reset process
2137 * would make use of a single command block, pointer to which is also stored in
2138 * adapter instance structure.
2139 *
2140 * Return Value
2141 * None
2142 */
2143static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2144{
2145 struct pmcraid_instance *pinstance = cmd->drv_inst;
2146 u8 reset_complete = 0;
2147
2148 pinstance->ioa_reset_in_progress = 1;
2149
2150 if (pinstance->reset_cmd != cmd) {
2151 pmcraid_err("reset is called with different command block\n");
2152 pinstance->reset_cmd = cmd;
2153 }
2154
2155 pmcraid_info("reset_engine: state = %d, command = %p\n",
2156 pinstance->ioa_state, cmd);
2157
2158 switch (pinstance->ioa_state) {
2159
2160 case IOA_STATE_DEAD:
2161 /* If IOA is offline, whatever may be the reset reason, just
2162 * return. callers might be waiting on the reset wait_q, wake
2163 * up them
2164 */
2165 pmcraid_err("IOA is offline no reset is possible\n");
2166 reset_complete = 1;
2167 break;
2168
2169 case IOA_STATE_IN_BRINGDOWN:
2170 /* we enter here, once ioa shutdown command is processed by IOA
2171 * Alert IOA for a possible reset. If reset alert fails, IOA
2172 * goes through hard-reset
2173 */
2174 pmcraid_disable_interrupts(pinstance, ~0);
2175 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2176 pmcraid_reset_alert(cmd);
2177 break;
2178
2179 case IOA_STATE_UNKNOWN:
2180 /* We may be called during probe or resume. Some pre-processing
2181 * is required for prior to reset
2182 */
2183 scsi_block_requests(pinstance->host);
2184
2185 /* If asked to reset while IOA was processing responses or
2186 * there are any error responses then IOA may require
2187 * hard-reset.
2188 */
2189 if (pinstance->ioa_hard_reset == 0) {
2190 if (ioread32(pinstance->ioa_status) &
2191 INTRS_TRANSITION_TO_OPERATIONAL) {
2192 pmcraid_info("sticky bit set, bring-up\n");
2193 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2194 pmcraid_reinit_cmdblk(cmd);
2195 pmcraid_identify_hrrq(cmd);
2196 } else {
2197 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2198 pmcraid_soft_reset(cmd);
2199 }
2200 } else {
2201 /* Alert IOA of a possible reset and wait for critical
2202 * operation in progress bit to reset
2203 */
2204 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2205 pmcraid_reset_alert(cmd);
2206 }
2207 break;
2208
2209 case IOA_STATE_IN_RESET_ALERT:
2210 /* If critical operation in progress bit is reset or wait gets
2211 * timed out, reset proceeds with starting BIST on the IOA.
2212 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2213 * they are 3 or more, reset engine marks IOA dead and returns
2214 */
2215 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2216 pmcraid_start_bist(cmd);
2217 break;
2218
2219 case IOA_STATE_IN_HARD_RESET:
2220 pinstance->ioa_reset_attempts++;
2221
2222 /* retry reset if we haven't reached maximum allowed limit */
2223 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2224 pinstance->ioa_reset_attempts = 0;
2225 pmcraid_err("IOA didn't respond marking it as dead\n");
2226 pinstance->ioa_state = IOA_STATE_DEAD;
2227
2228 if (pinstance->ioa_bringdown)
2229 pmcraid_notify_ioastate(pinstance,
2230 PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2231 else
2232 pmcraid_notify_ioastate(pinstance,
2233 PMC_DEVICE_EVENT_RESET_FAILED);
2234 reset_complete = 1;
2235 break;
2236 }
2237
2238 /* Once either bist or pci reset is done, restore PCI config
2239 * space. If this fails, proceed with hard reset again
2240 */
2241 pci_restore_state(pinstance->pdev);
2242
2243 /* fail all pending commands */
2244 pmcraid_fail_outstanding_cmds(pinstance);
2245
2246 /* check if unit check is active, if so extract dump */
2247 if (pinstance->ioa_unit_check) {
2248 pmcraid_info("unit check is active\n");
2249 pinstance->ioa_unit_check = 0;
2250 pmcraid_get_dump(pinstance);
2251 pinstance->ioa_reset_attempts--;
2252 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2253 pmcraid_reset_alert(cmd);
2254 break;
2255 }
2256
2257 /* if the reset reason is to bring-down the ioa, we might be
2258 * done with the reset restore pci_config_space and complete
2259 * the reset
2260 */
2261 if (pinstance->ioa_bringdown) {
2262 pmcraid_info("bringing down the adapter\n");
2263 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2264 pinstance->ioa_bringdown = 0;
2265 pinstance->ioa_state = IOA_STATE_UNKNOWN;
2266 pmcraid_notify_ioastate(pinstance,
2267 PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2268 reset_complete = 1;
2269 } else {
2270 /* bring-up IOA, so proceed with soft reset
2271 * Reinitialize hrrq_buffers and their indices also
2272 * enable interrupts after a pci_restore_state
2273 */
2274 if (pmcraid_reset_enable_ioa(pinstance)) {
2275 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2276 pmcraid_info("bringing up the adapter\n");
2277 pmcraid_reinit_cmdblk(cmd);
2278 pmcraid_identify_hrrq(cmd);
2279 } else {
2280 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2281 pmcraid_soft_reset(cmd);
2282 }
2283 }
2284 break;
2285
2286 case IOA_STATE_IN_SOFT_RESET:
2287 /* TRANSITION TO OPERATIONAL is on so start initialization
2288 * sequence
2289 */
2290 pmcraid_info("In softreset proceeding with bring-up\n");
2291 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2292
2293 /* Initialization commands start with HRRQ identification. From
2294 * now on tasklet completes most of the commands as IOA is up
2295 * and intrs are enabled
2296 */
2297 pmcraid_identify_hrrq(cmd);
2298 break;
2299
2300 case IOA_STATE_IN_BRINGUP:
2301 /* we are done with bringing up of IOA, change the ioa_state to
2302 * operational and wake up any waiters
2303 */
2304 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2305 reset_complete = 1;
2306 break;
2307
2308 case IOA_STATE_OPERATIONAL:
2309 default:
2310 /* When IOA is operational and a reset is requested, check for
2311 * the reset reason. If reset is to bring down IOA, unregister
2312 * HCAMs and initiate shutdown; if adapter reset is forced then
2313 * restart reset sequence again
2314 */
2315 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2316 pinstance->force_ioa_reset == 0) {
2317 pmcraid_notify_ioastate(pinstance,
2318 PMC_DEVICE_EVENT_RESET_SUCCESS);
2319 reset_complete = 1;
2320 } else {
2321 if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2322 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2323 pmcraid_reinit_cmdblk(cmd);
2324 pmcraid_unregister_hcams(cmd);
2325 }
2326 break;
2327 }
2328
2329 /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2330 * OPERATIONAL. Reset all control variables used during reset, wake up
2331 * any waiting threads and let the SCSI mid-layer send commands. Note
2332 * that host_lock must be held before invoking scsi_report_bus_reset.
2333 */
2334 if (reset_complete) {
2335 pinstance->ioa_reset_in_progress = 0;
2336 pinstance->ioa_reset_attempts = 0;
2337 pinstance->reset_cmd = NULL;
2338 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2339 pinstance->ioa_bringdown = 0;
2340 pmcraid_return_cmd(cmd);
2341
2342 /* If target state is to bring up the adapter, proceed with
2343 * hcam registration and resource exposure to mid-layer.
2344 */
2345 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2346 pmcraid_register_hcams(pinstance);
2347
2348 wake_up_all(&pinstance->reset_wait_q);
2349 }
2350
2351 return;
2352}
2353
2354/**
2355 * pmcraid_initiate_reset - initiates reset sequence. This is called from
2356 * ISR/tasklet during error interrupts including IOA unit check. If reset
2357 * is already in progress, it just returns, otherwise initiates IOA reset
2358 * to bring IOA up to operational state.
2359 *
2360 * @pinstance: pointer to adapter instance structure
2361 *
2362 * Return value
2363 * none
2364 */
2365static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2366{
2367 struct pmcraid_cmd *cmd;
2368
2369 /* If the reset is already in progress, just return, otherwise start
2370 * reset sequence and return
2371 */
2372 if (!pinstance->ioa_reset_in_progress) {
2373 scsi_block_requests(pinstance->host);
2374 cmd = pmcraid_get_free_cmd(pinstance);
2375
2376 if (cmd == NULL) {
2377 pmcraid_err("no cmnd blocks for initiate_reset\n");
2378 return;
2379 }
2380
2381 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2382 pinstance->reset_cmd = cmd;
2383 pinstance->force_ioa_reset = 1;
2384 pmcraid_notify_ioastate(pinstance,
2385 PMC_DEVICE_EVENT_RESET_START);
2386 pmcraid_ioa_reset(cmd);
2387 }
2388}
2389
2390/**
2391 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2392 * or bringdown IOA
2393 * @pinstance: pointer adapter instance structure
2394 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2395 * @target_state: expected target state after reset
2396 *
2397 * Note: This command initiates reset and waits for its completion. Hence this
2398 * should not be called from isr/timer/tasklet functions (timeout handlers,
2399 * error response handlers and interrupt handlers).
2400 *
2401 * Return Value
2402 * 1 in case ioa_state is not target_state, 0 otherwise.
2403 */
2404static int pmcraid_reset_reload(
2405 struct pmcraid_instance *pinstance,
2406 u8 shutdown_type,
2407 u8 target_state
2408)
2409{
2410 struct pmcraid_cmd *reset_cmd = NULL;
2411 unsigned long lock_flags;
2412 int reset = 1;
2413
2414 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2415
2416 if (pinstance->ioa_reset_in_progress) {
2417 pmcraid_info("reset_reload: reset is already in progress\n");
2418
2419 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2420
2421 wait_event(pinstance->reset_wait_q,
2422 !pinstance->ioa_reset_in_progress);
2423
2424 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2425
2426 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2427 spin_unlock_irqrestore(pinstance->host->host_lock,
2428 lock_flags);
2429 pmcraid_info("reset_reload: IOA is dead\n");
2430 return reset;
2431 } else if (pinstance->ioa_state == target_state) {
2432 reset = 0;
2433 }
2434 }
2435
2436 if (reset) {
2437 pmcraid_info("reset_reload: proceeding with reset\n");
2438 scsi_block_requests(pinstance->host);
2439 reset_cmd = pmcraid_get_free_cmd(pinstance);
2440
2441 if (reset_cmd == NULL) {
2442 pmcraid_err("no free cmnd for reset_reload\n");
2443 spin_unlock_irqrestore(pinstance->host->host_lock,
2444 lock_flags);
2445 return reset;
2446 }
2447
2448 if (shutdown_type == SHUTDOWN_NORMAL)
2449 pinstance->ioa_bringdown = 1;
2450
2451 pinstance->ioa_shutdown_type = shutdown_type;
2452 pinstance->reset_cmd = reset_cmd;
2453 pinstance->force_ioa_reset = reset;
2454 pmcraid_info("reset_reload: initiating reset\n");
2455 pmcraid_ioa_reset(reset_cmd);
2456 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2457 pmcraid_info("reset_reload: waiting for reset to complete\n");
2458 wait_event(pinstance->reset_wait_q,
2459 !pinstance->ioa_reset_in_progress);
2460
2461 pmcraid_info("reset_reload: reset is complete !!\n");
2462 scsi_unblock_requests(pinstance->host);
2463 if (pinstance->ioa_state == target_state)
2464 reset = 0;
2465 }
2466
2467 return reset;
2468}
2469
2470/**
2471 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2472 *
2473 * @pinstance: pointer to adapter instance structure
2474 *
2475 * Return Value
2476 * whatever is returned from pmcraid_reset_reload
2477 */
2478static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2479{
2480 return pmcraid_reset_reload(pinstance,
2481 SHUTDOWN_NORMAL,
2482 IOA_STATE_UNKNOWN);
2483}
2484
2485/**
2486 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2487 *
2488 * @pinstance: pointer to adapter instance structure
2489 *
2490 * Return Value
2491 * whatever is returned from pmcraid_reset_reload
2492 */
2493static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2494{
2495 pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2496
2497 return pmcraid_reset_reload(pinstance,
2498 SHUTDOWN_NONE,
2499 IOA_STATE_OPERATIONAL);
2500}
2501
2502/**
2503 * pmcraid_request_sense - Send request sense to a device
2504 * @cmd: pmcraid command struct
2505 *
2506 * This function sends a request sense to a device as a result of a check
2507 * condition. This method re-uses the same command block that failed earlier.
2508 */
2509static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2510{
2511 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2512 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2513
2514 /* allocate DMAable memory for sense buffers */
2515 cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
2516 SCSI_SENSE_BUFFERSIZE,
2517 &cmd->sense_buffer_dma);
2518
2519 if (cmd->sense_buffer == NULL) {
2520 pmcraid_err
2521 ("couldn't allocate sense buffer for request sense\n");
2522 pmcraid_erp_done(cmd);
2523 return;
2524 }
2525
2526 /* re-use the command block */
2527 memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2528 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2529 ioarcb->request_flags0 = (SYNC_COMPLETE |
2530 NO_LINK_DESCS |
2531 INHIBIT_UL_CHECK);
2532 ioarcb->request_type = REQ_TYPE_SCSI;
2533 ioarcb->cdb[0] = REQUEST_SENSE;
2534 ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2535
2536 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2537 offsetof(struct pmcraid_ioarcb,
2538 add_data.u.ioadl[0]));
2539 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2540
2541 ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2542
2543 ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2544 ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2545 ioadl->flags = IOADL_FLAGS_LAST_DESC;
2546
2547 /* request sense might be called as part of error response processing
2548 * which runs in tasklets context. It is possible that mid-layer might
2549 * schedule queuecommand during this time, hence, writting to IOARRIN
2550 * must be protect by host_lock
2551 */
2552 pmcraid_send_cmd(cmd, pmcraid_erp_done,
2553 PMCRAID_REQUEST_SENSE_TIMEOUT,
2554 pmcraid_timeout_handler);
2555}
2556
2557/**
2558 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2559 * @cmd: command that failed
2560 * @sense: true if request_sense is required after cancel all
2561 *
2562 * This function sends a cancel all to a device to clear the queue.
2563 */
2564static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
2565{
2566 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2567 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2568 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2569 void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
2570 : pmcraid_request_sense;
2571
2572 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2573 ioarcb->request_flags0 = SYNC_OVERRIDE;
2574 ioarcb->request_type = REQ_TYPE_IOACMD;
2575 ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2576
2577 if (RES_IS_GSCSI(res->cfg_entry))
2578 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2579
2580 ioarcb->ioadl_bus_addr = 0;
2581 ioarcb->ioadl_length = 0;
2582 ioarcb->data_transfer_length = 0;
2583 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
2584
2585 /* writing to IOARRIN must be protected by host_lock, as mid-layer
2586 * schedule queuecommand while we are doing this
2587 */
2588 pmcraid_send_cmd(cmd, cmd_done,
2589 PMCRAID_REQUEST_SENSE_TIMEOUT,
2590 pmcraid_timeout_handler);
2591}
2592
2593/**
2594 * pmcraid_frame_auto_sense: frame fixed format sense information
2595 *
2596 * @cmd: pointer to failing command block
2597 *
2598 * Return value
2599 * none
2600 */
2601static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2602{
2603 u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2604 struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2605 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2606 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2607 u32 failing_lba = 0;
2608
2609 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2610 cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2611
2612 if (RES_IS_VSET(res->cfg_entry) &&
2613 ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2614 ioasa->u.vset.failing_lba_hi != 0) {
2615
2616 sense_buf[0] = 0x72;
2617 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2618 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2619 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2620
2621 sense_buf[7] = 12;
2622 sense_buf[8] = 0;
2623 sense_buf[9] = 0x0A;
2624 sense_buf[10] = 0x80;
2625
2626 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2627
2628 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2629 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2630 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2631 sense_buf[15] = failing_lba & 0x000000ff;
2632
2633 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2634
2635 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2636 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2637 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2638 sense_buf[19] = failing_lba & 0x000000ff;
2639 } else {
2640 sense_buf[0] = 0x70;
2641 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2642 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2643 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2644
2645 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2646 if (RES_IS_VSET(res->cfg_entry))
2647 failing_lba =
2648 le32_to_cpu(ioasa->u.
2649 vset.failing_lba_lo);
2650 sense_buf[0] |= 0x80;
2651 sense_buf[3] = (failing_lba >> 24) & 0xff;
2652 sense_buf[4] = (failing_lba >> 16) & 0xff;
2653 sense_buf[5] = (failing_lba >> 8) & 0xff;
2654 sense_buf[6] = failing_lba & 0xff;
2655 }
2656
2657 sense_buf[7] = 6; /* additional length */
2658 }
2659}
2660
2661/**
2662 * pmcraid_error_handler - Error response handlers for a SCSI op
2663 * @cmd: pointer to pmcraid_cmd that has failed
2664 *
2665 * This function determines whether or not to initiate ERP on the affected
2666 * device. This is called from a tasklet, which doesn't hold any locks.
2667 *
2668 * Return value:
2669 * 0 it caller can complete the request, otherwise 1 where in error
2670 * handler itself completes the request and returns the command block
2671 * back to free-pool
2672 */
2673static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2674{
2675 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2676 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2677 struct pmcraid_instance *pinstance = cmd->drv_inst;
2678 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2679 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2680 u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2681 u32 sense_copied = 0;
2682
2683 if (!res) {
2684 pmcraid_info("resource pointer is NULL\n");
2685 return 0;
2686 }
2687
2688 /* If this was a SCSI read/write command keep count of errors */
2689 if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2690 atomic_inc(&res->read_failures);
2691 else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2692 atomic_inc(&res->write_failures);
2693
2694 if (!RES_IS_GSCSI(res->cfg_entry) &&
2695 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2696 pmcraid_frame_auto_sense(cmd);
2697 }
2698
2699 /* Log IOASC/IOASA information based on user settings */
2700 pmcraid_ioasc_logger(ioasc, cmd);
2701
2702 switch (masked_ioasc) {
2703
2704 case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2705 scsi_cmd->result |= (DID_ABORT << 16);
2706 break;
2707
2708 case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2709 case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2710 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2711 break;
2712
2713 case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2714 res->sync_reqd = 1;
2715 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2716 break;
2717
2718 case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2719 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2720 break;
2721
2722 case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2723 case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2724 if (!res->reset_progress)
2725 scsi_report_bus_reset(pinstance->host,
2726 scsi_cmd->device->channel);
2727 scsi_cmd->result |= (DID_ERROR << 16);
2728 break;
2729
2730 case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2731 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2732 res->sync_reqd = 1;
2733
2734 /* if check_condition is not active return with error otherwise
2735 * get/frame the sense buffer
2736 */
2737 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2738 SAM_STAT_CHECK_CONDITION &&
2739 PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2740 return 0;
2741
2742 /* If we have auto sense data as part of IOASA pass it to
2743 * mid-layer
2744 */
2745 if (ioasa->auto_sense_length != 0) {
2746 short sense_len = ioasa->auto_sense_length;
2747 int data_size = min_t(u16, le16_to_cpu(sense_len),
2748 SCSI_SENSE_BUFFERSIZE);
2749
2750 memcpy(scsi_cmd->sense_buffer,
2751 ioasa->sense_data,
2752 data_size);
2753 sense_copied = 1;
2754 }
2755
2756 if (RES_IS_GSCSI(res->cfg_entry))
2757 pmcraid_cancel_all(cmd, sense_copied);
2758 else if (sense_copied)
2759 pmcraid_erp_done(cmd);
2760 else
2761 pmcraid_request_sense(cmd);
2762
2763 return 1;
2764
2765 case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2766 break;
2767
2768 default:
2769 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2770 scsi_cmd->result |= (DID_ERROR << 16);
2771 break;
2772 }
2773 return 0;
2774}
2775
2776/**
2777 * pmcraid_reset_device - device reset handler functions
2778 *
2779 * @scsi_cmd: scsi command struct
2780 * @modifier: reset modifier indicating the reset sequence to be performed
2781 *
2782 * This function issues a device reset to the affected device.
2783 * A LUN reset will be sent to the device first. If that does
2784 * not work, a target reset will be sent.
2785 *
2786 * Return value:
2787 * SUCCESS / FAILED
2788 */
2789static int pmcraid_reset_device(
2790 struct scsi_cmnd *scsi_cmd,
2791 unsigned long timeout,
2792 u8 modifier
2793)
2794{
2795 struct pmcraid_cmd *cmd;
2796 struct pmcraid_instance *pinstance;
2797 struct pmcraid_resource_entry *res;
2798 struct pmcraid_ioarcb *ioarcb;
2799 unsigned long lock_flags;
2800 u32 ioasc;
2801
2802 pinstance =
2803 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2804 res = scsi_cmd->device->hostdata;
2805
2806 if (!res) {
2807 sdev_printk(KERN_ERR, scsi_cmd->device,
2808 "reset_device: NULL resource pointer\n");
2809 return FAILED;
2810 }
2811
2812 /* If adapter is currently going through reset/reload, return failed.
2813 * This will force the mid-layer to call _eh_bus/host reset, which
2814 * will then go to sleep and wait for the reset to complete
2815 */
2816 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2817 if (pinstance->ioa_reset_in_progress ||
2818 pinstance->ioa_state == IOA_STATE_DEAD) {
2819 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2820 return FAILED;
2821 }
2822
2823 res->reset_progress = 1;
2824 pmcraid_info("Resetting %s resource with addr %x\n",
2825 ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2826 ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2827 le32_to_cpu(res->cfg_entry.resource_address));
2828
2829 /* get a free cmd block */
2830 cmd = pmcraid_get_free_cmd(pinstance);
2831
2832 if (cmd == NULL) {
2833 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2834 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2835 return FAILED;
2836 }
2837
2838 ioarcb = &cmd->ioa_cb->ioarcb;
2839 ioarcb->resource_handle = res->cfg_entry.resource_handle;
2840 ioarcb->request_type = REQ_TYPE_IOACMD;
2841 ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2842
2843 /* Initialize reset modifier bits */
2844 if (modifier)
2845 modifier = ENABLE_RESET_MODIFIER | modifier;
2846
2847 ioarcb->cdb[1] = modifier;
2848
2849 init_completion(&cmd->wait_for_completion);
2850 cmd->completion_req = 1;
2851
2852 pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2853 cmd->ioa_cb->ioarcb.cdb[0],
2854 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2855 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2856
2857 pmcraid_send_cmd(cmd,
2858 pmcraid_internal_done,
2859 timeout,
2860 pmcraid_timeout_handler);
2861
2862 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2863
2864 /* RESET_DEVICE command completes after all pending IOARCBs are
2865 * completed. Once this command is completed, pmcraind_internal_done
2866 * will wake up the 'completion' queue.
2867 */
2868 wait_for_completion(&cmd->wait_for_completion);
2869
2870 /* complete the command here itself and return the command block
2871 * to free list
2872 */
2873 pmcraid_return_cmd(cmd);
2874 res->reset_progress = 0;
2875 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2876
2877 /* set the return value based on the returned ioasc */
2878 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2879}
2880
2881/**
2882 * _pmcraid_io_done - helper for pmcraid_io_done function
2883 *
2884 * @cmd: pointer to pmcraid command struct
2885 * @reslen: residual data length to be set in the ioasa
2886 * @ioasc: ioasc either returned by IOA or set by driver itself.
2887 *
2888 * This function is invoked by pmcraid_io_done to complete mid-layer
2889 * scsi ops.
2890 *
2891 * Return value:
2892 * 0 if caller is required to return it to free_pool. Returns 1 if
2893 * caller need not worry about freeing command block as error handler
2894 * will take care of that.
2895 */
2896
2897static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2898{
2899 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2900 int rc = 0;
2901
2902 scsi_set_resid(scsi_cmd, reslen);
2903
2904 pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2905 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2906 cmd->ioa_cb->ioarcb.cdb[0],
2907 ioasc, scsi_cmd->result);
2908
2909 if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2910 rc = pmcraid_error_handler(cmd);
2911
2912 if (rc == 0) {
2913 scsi_dma_unmap(scsi_cmd);
2914 scsi_cmd->scsi_done(scsi_cmd);
2915 }
2916
2917 return rc;
2918}
2919
2920/**
2921 * pmcraid_io_done - SCSI completion function
2922 *
2923 * @cmd: pointer to pmcraid command struct
2924 *
2925 * This function is invoked by tasklet/mid-layer error handler to completing
2926 * the SCSI ops sent from mid-layer.
2927 *
2928 * Return value
2929 * none
2930 */
2931
2932static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2933{
2934 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2935 u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2936
2937 if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2938 pmcraid_return_cmd(cmd);
2939}
2940
2941/**
2942 * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2943 *
2944 * @cmd: command block of the command to be aborted
2945 *
2946 * Return Value:
2947 * returns pointer to command structure used as cancelling cmd
2948 */
2949static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2950{
2951 struct pmcraid_cmd *cancel_cmd;
2952 struct pmcraid_instance *pinstance;
2953 struct pmcraid_resource_entry *res;
2954
2955 pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2956 res = cmd->scsi_cmd->device->hostdata;
2957
2958 cancel_cmd = pmcraid_get_free_cmd(pinstance);
2959
2960 if (cancel_cmd == NULL) {
2961 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2962 return NULL;
2963 }
2964
2965 pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2966
2967 pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2968 cmd->ioa_cb->ioarcb.cdb[0],
2969 cmd->ioa_cb->ioarcb.response_handle >> 2);
2970
2971 init_completion(&cancel_cmd->wait_for_completion);
2972 cancel_cmd->completion_req = 1;
2973
2974 pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2975 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2976 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2977 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2978
2979 pmcraid_send_cmd(cancel_cmd,
2980 pmcraid_internal_done,
2981 PMCRAID_INTERNAL_TIMEOUT,
2982 pmcraid_timeout_handler);
2983 return cancel_cmd;
2984}
2985
2986/**
2987 * pmcraid_abort_complete - Waits for ABORT TASK completion
2988 *
2989 * @cancel_cmd: command block use as cancelling command
2990 *
2991 * Return Value:
2992 * returns SUCCESS if ABORT TASK has good completion
2993 * otherwise FAILED
2994 */
2995static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2996{
2997 struct pmcraid_resource_entry *res;
2998 u32 ioasc;
2999
3000 wait_for_completion(&cancel_cmd->wait_for_completion);
3001 res = cancel_cmd->res;
3002 cancel_cmd->res = NULL;
3003 ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
3004
3005 /* If the abort task is not timed out we will get a Good completion
3006 * as sense_key, otherwise we may get one the following responses
3007 * due to subsequent bus reset or device reset. In case IOASC is
3008 * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
3009 */
3010 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
3011 ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
3012 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
3013 res->sync_reqd = 1;
3014 ioasc = 0;
3015 }
3016
3017 /* complete the command here itself */
3018 pmcraid_return_cmd(cancel_cmd);
3019 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
3020}
3021
3022/**
3023 * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
3024 *
3025 * @scsi_cmd: scsi command struct given by mid-layer. When this is called
3026 * mid-layer ensures that no other commands are queued. This
3027 * never gets called under interrupt, but a separate eh thread.
3028 *
3029 * Return value:
3030 * SUCCESS / FAILED
3031 */
3032static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
3033{
3034 struct pmcraid_instance *pinstance;
3035 struct pmcraid_cmd *cmd;
3036 struct pmcraid_resource_entry *res;
3037 unsigned long host_lock_flags;
3038 unsigned long pending_lock_flags;
3039 struct pmcraid_cmd *cancel_cmd = NULL;
3040 int cmd_found = 0;
3041 int rc = FAILED;
3042
3043 pinstance =
3044 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3045
3046 scmd_printk(KERN_INFO, scsi_cmd,
3047 "I/O command timed out, aborting it.\n");
3048
3049 res = scsi_cmd->device->hostdata;
3050
3051 if (res == NULL)
3052 return rc;
3053
3054 /* If we are currently going through reset/reload, return failed.
3055 * This will force the mid-layer to eventually call
3056 * pmcraid_eh_host_reset which will then go to sleep and wait for the
3057 * reset to complete
3058 */
3059 spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
3060
3061 if (pinstance->ioa_reset_in_progress ||
3062 pinstance->ioa_state == IOA_STATE_DEAD) {
3063 spin_unlock_irqrestore(pinstance->host->host_lock,
3064 host_lock_flags);
3065 return rc;
3066 }
3067
3068 /* loop over pending cmd list to find cmd corresponding to this
3069 * scsi_cmd. Note that this command might not have been completed
3070 * already. locking: all pending commands are protected with
3071 * pending_pool_lock.
3072 */
3073 spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
3074 list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
3075
3076 if (cmd->scsi_cmd == scsi_cmd) {
3077 cmd_found = 1;
3078 break;
3079 }
3080 }
3081
3082 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3083 pending_lock_flags);
3084
3085 /* If the command to be aborted was given to IOA and still pending with
3086 * it, send ABORT_TASK to abort this and wait for its completion
3087 */
3088 if (cmd_found)
3089 cancel_cmd = pmcraid_abort_cmd(cmd);
3090
3091 spin_unlock_irqrestore(pinstance->host->host_lock,
3092 host_lock_flags);
3093
3094 if (cancel_cmd) {
3095 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3096 rc = pmcraid_abort_complete(cancel_cmd);
3097 }
3098
3099 return cmd_found ? rc : SUCCESS;
3100}
3101
3102/**
3103 * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
3104 *
3105 * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3106 *
3107 * All these routines invokve pmcraid_reset_device with appropriate parameters.
3108 * Since these are called from mid-layer EH thread, no other IO will be queued
3109 * to the resource being reset. However, control path (IOCTL) may be active so
3110 * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3111 * takes care by locking/unlocking host_lock.
3112 *
3113 * Return value
3114 * SUCCESS or FAILED
3115 */
3116static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3117{
3118 scmd_printk(KERN_INFO, scmd,
3119 "resetting device due to an I/O command timeout.\n");
3120 return pmcraid_reset_device(scmd,
3121 PMCRAID_INTERNAL_TIMEOUT,
3122 RESET_DEVICE_LUN);
3123}
3124
3125static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3126{
3127 scmd_printk(KERN_INFO, scmd,
3128 "Doing bus reset due to an I/O command timeout.\n");
3129 return pmcraid_reset_device(scmd,
3130 PMCRAID_RESET_BUS_TIMEOUT,
3131 RESET_DEVICE_BUS);
3132}
3133
3134static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3135{
3136 scmd_printk(KERN_INFO, scmd,
3137 "Doing target reset due to an I/O command timeout.\n");
3138 return pmcraid_reset_device(scmd,
3139 PMCRAID_INTERNAL_TIMEOUT,
3140 RESET_DEVICE_TARGET);
3141}
3142
3143/**
3144 * pmcraid_eh_host_reset_handler - adapter reset handler callback
3145 *
3146 * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3147 *
3148 * Initiates adapter reset to bring it up to operational state
3149 *
3150 * Return value
3151 * SUCCESS or FAILED
3152 */
3153static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3154{
3155 unsigned long interval = 10000; /* 10 seconds interval */
3156 int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3157 struct pmcraid_instance *pinstance =
3158 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3159
3160
3161 /* wait for an additional 150 seconds just in case firmware could come
3162 * up and if it could complete all the pending commands excluding the
3163 * two HCAM (CCN and LDN).
3164 */
3165 while (waits--) {
3166 if (atomic_read(&pinstance->outstanding_cmds) <=
3167 PMCRAID_MAX_HCAM_CMD)
3168 return SUCCESS;
3169 msleep(interval);
3170 }
3171
3172 dev_err(&pinstance->pdev->dev,
3173 "Adapter being reset due to an I/O command timeout.\n");
3174 return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3175}
3176
3177/**
3178 * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
3179 * @scsi_cmd: scsi command struct
3180 *
3181 * Return value
3182 * number of tags or 0 if the task is not tagged
3183 */
3184static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
3185{
3186 char tag[2];
3187 u8 rc = 0;
3188
3189 if (scsi_populate_tag_msg(scsi_cmd, tag)) {
3190 switch (tag[0]) {
3191 case MSG_SIMPLE_TAG:
3192 rc = TASK_TAG_SIMPLE;
3193 break;
3194 case MSG_HEAD_TAG:
3195 rc = TASK_TAG_QUEUE_HEAD;
3196 break;
3197 case MSG_ORDERED_TAG:
3198 rc = TASK_TAG_ORDERED;
3199 break;
3200 };
3201 }
3202
3203 return rc;
3204}
3205
3206
3207/**
3208 * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3209 * @cmd: pmcraid command struct
3210 * @sgcount: count of scatter-gather elements
3211 *
3212 * Return value
3213 * returns pointer pmcraid_ioadl_desc, initialized to point to internal
3214 * or external IOADLs
3215 */
3216struct pmcraid_ioadl_desc *
3217pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3218{
3219 struct pmcraid_ioadl_desc *ioadl;
3220 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3221 int ioadl_count = 0;
3222
3223 if (ioarcb->add_cmd_param_length)
3224 ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
3225 ioarcb->ioadl_length =
3226 sizeof(struct pmcraid_ioadl_desc) * sgcount;
3227
3228 if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3229 /* external ioadls start at offset 0x80 from control_block
3230 * structure, re-using 24 out of 27 ioadls part of IOARCB.
3231 * It is necessary to indicate to firmware that driver is
3232 * using ioadls to be treated as external to IOARCB.
3233 */
3234 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
3235 ioarcb->ioadl_bus_addr =
3236 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3237 offsetof(struct pmcraid_ioarcb,
3238 add_data.u.ioadl[3]));
3239 ioadl = &ioarcb->add_data.u.ioadl[3];
3240 } else {
3241 ioarcb->ioadl_bus_addr =
3242 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3243 offsetof(struct pmcraid_ioarcb,
3244 add_data.u.ioadl[ioadl_count]));
3245
3246 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3247 ioarcb->ioarcb_bus_addr |=
3248 DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
3249 }
3250
3251 return ioadl;
3252}
3253
3254/**
3255 * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3256 * @pinstance: pointer to adapter instance structure
3257 * @cmd: pmcraid command struct
3258 *
3259 * This function is invoked by queuecommand entry point while sending a command
3260 * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3261 *
3262 * Return value:
3263 * 0 on success or -1 on failure
3264 */
3265static int pmcraid_build_ioadl(
3266 struct pmcraid_instance *pinstance,
3267 struct pmcraid_cmd *cmd
3268)
3269{
3270 int i, nseg;
3271 struct scatterlist *sglist;
3272
3273 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3274 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3275 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
3276
3277 u32 length = scsi_bufflen(scsi_cmd);
3278
3279 if (!length)
3280 return 0;
3281
3282 nseg = scsi_dma_map(scsi_cmd);
3283
3284 if (nseg < 0) {
3285 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3286 return -1;
3287 } else if (nseg > PMCRAID_MAX_IOADLS) {
3288 scsi_dma_unmap(scsi_cmd);
3289 scmd_printk(KERN_ERR, scsi_cmd,
3290 "sg count is (%d) more than allowed!\n", nseg);
3291 return -1;
3292 }
3293
3294 /* Initialize IOARCB data transfer length fields */
3295 if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3296 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3297
3298 ioarcb->request_flags0 |= NO_LINK_DESCS;
3299 ioarcb->data_transfer_length = cpu_to_le32(length);
3300 ioadl = pmcraid_init_ioadls(cmd, nseg);
3301
3302 /* Initialize IOADL descriptor addresses */
3303 scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3304 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3305 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3306 ioadl[i].flags = 0;
3307 }
3308 /* setup last descriptor */
3309 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3310
3311 return 0;
3312}
3313
3314/**
3315 * pmcraid_free_sglist - Frees an allocated SG buffer list
3316 * @sglist: scatter/gather list pointer
3317 *
3318 * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3319 *
3320 * Return value:
3321 * none
3322 */
3323static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3324{
3325 int i;
3326
3327 for (i = 0; i < sglist->num_sg; i++)
3328 __free_pages(sg_page(&(sglist->scatterlist[i])),
3329 sglist->order);
3330
3331 kfree(sglist);
3332}
3333
3334/**
3335 * pmcraid_alloc_sglist - Allocates memory for a SG list
3336 * @buflen: buffer length
3337 *
3338 * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3339 * list.
3340 *
3341 * Return value
3342 * pointer to sglist / NULL on failure
3343 */
3344static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3345{
3346 struct pmcraid_sglist *sglist;
3347 struct scatterlist *scatterlist;
3348 struct page *page;
3349 int num_elem, i, j;
3350 int sg_size;
3351 int order;
3352 int bsize_elem;
3353
3354 sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3355 order = (sg_size > 0) ? get_order(sg_size) : 0;
3356 bsize_elem = PAGE_SIZE * (1 << order);
3357
3358 /* Determine the actual number of sg entries needed */
3359 if (buflen % bsize_elem)
3360 num_elem = (buflen / bsize_elem) + 1;
3361 else
3362 num_elem = buflen / bsize_elem;
3363
3364 /* Allocate a scatter/gather list for the DMA */
3365 sglist = kzalloc(sizeof(struct pmcraid_sglist) +
3366 (sizeof(struct scatterlist) * (num_elem - 1)),
3367 GFP_KERNEL);
3368
3369 if (sglist == NULL)
3370 return NULL;
3371
3372 scatterlist = sglist->scatterlist;
3373 sg_init_table(scatterlist, num_elem);
3374 sglist->order = order;
3375 sglist->num_sg = num_elem;
3376 sg_size = buflen;
3377
3378 for (i = 0; i < num_elem; i++) {
3379 page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
3380 if (!page) {
3381 for (j = i - 1; j >= 0; j--)
3382 __free_pages(sg_page(&scatterlist[j]), order);
3383 kfree(sglist);
3384 return NULL;
3385 }
3386
3387 sg_set_page(&scatterlist[i], page,
3388 sg_size < bsize_elem ? sg_size : bsize_elem, 0);
3389 sg_size -= bsize_elem;
3390 }
3391
3392 return sglist;
3393}
3394
3395/**
3396 * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3397 * @sglist: scatter/gather list pointer
3398 * @buffer: buffer pointer
3399 * @len: buffer length
3400 * @direction: data transfer direction
3401 *
3402 * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3403 *
3404 * Return value:
3405 * 0 on success / other on failure
3406 */
3407static int pmcraid_copy_sglist(
3408 struct pmcraid_sglist *sglist,
3409 unsigned long buffer,
3410 u32 len,
3411 int direction
3412)
3413{
3414 struct scatterlist *scatterlist;
3415 void *kaddr;
3416 int bsize_elem;
3417 int i;
3418 int rc = 0;
3419
3420 /* Determine the actual number of bytes per element */
3421 bsize_elem = PAGE_SIZE * (1 << sglist->order);
3422
3423 scatterlist = sglist->scatterlist;
3424
3425 for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
3426 struct page *page = sg_page(&scatterlist[i]);
3427
3428 kaddr = kmap(page);
3429 if (direction == DMA_TO_DEVICE)
3430 rc = __copy_from_user(kaddr,
3431 (void *)buffer,
3432 bsize_elem);
3433 else
3434 rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
3435
3436 kunmap(page);
3437
3438 if (rc) {
3439 pmcraid_err("failed to copy user data into sg list\n");
3440 return -EFAULT;
3441 }
3442
3443 scatterlist[i].length = bsize_elem;
3444 }
3445
3446 if (len % bsize_elem) {
3447 struct page *page = sg_page(&scatterlist[i]);
3448
3449 kaddr = kmap(page);
3450
3451 if (direction == DMA_TO_DEVICE)
3452 rc = __copy_from_user(kaddr,
3453 (void *)buffer,
3454 len % bsize_elem);
3455 else
3456 rc = __copy_to_user((void *)buffer,
3457 kaddr,
3458 len % bsize_elem);
3459
3460 kunmap(page);
3461
3462 scatterlist[i].length = len % bsize_elem;
3463 }
3464
3465 if (rc) {
3466 pmcraid_err("failed to copy user data into sg list\n");
3467 rc = -EFAULT;
3468 }
3469
3470 return rc;
3471}
3472
3473/**
3474 * pmcraid_queuecommand - Queue a mid-layer request
3475 * @scsi_cmd: scsi command struct
3476 * @done: done function
3477 *
3478 * This function queues a request generated by the mid-layer. Midlayer calls
3479 * this routine within host->lock. Some of the functions called by queuecommand
3480 * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3481 *
3482 * Return value:
3483 * 0 on success
3484 * SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3485 * SCSI_MLQUEUE_HOST_BUSY if host is busy
3486 */
3487static int pmcraid_queuecommand_lck(
3488 struct scsi_cmnd *scsi_cmd,
3489 void (*done) (struct scsi_cmnd *)
3490)
3491{
3492 struct pmcraid_instance *pinstance;
3493 struct pmcraid_resource_entry *res;
3494 struct pmcraid_ioarcb *ioarcb;
3495 struct pmcraid_cmd *cmd;
3496 u32 fw_version;
3497 int rc = 0;
3498
3499 pinstance =
3500 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3501 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3502 scsi_cmd->scsi_done = done;
3503 res = scsi_cmd->device->hostdata;
3504 scsi_cmd->result = (DID_OK << 16);
3505
3506 /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3507 * the command
3508 */
3509 if (pinstance->ioa_state == IOA_STATE_DEAD) {
3510 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3511 scsi_cmd->result = (DID_NO_CONNECT << 16);
3512 scsi_cmd->scsi_done(scsi_cmd);
3513 return 0;
3514 }
3515
3516 /* If IOA reset is in progress, can't queue the commands */
3517 if (pinstance->ioa_reset_in_progress)
3518 return SCSI_MLQUEUE_HOST_BUSY;
3519
3520 /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3521 * the command here itself with success return
3522 */
3523 if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3524 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3525 scsi_cmd->scsi_done(scsi_cmd);
3526 return 0;
3527 }
3528
3529 /* initialize the command and IOARCB to be sent to IOA */
3530 cmd = pmcraid_get_free_cmd(pinstance);
3531
3532 if (cmd == NULL) {
3533 pmcraid_err("free command block is not available\n");
3534 return SCSI_MLQUEUE_HOST_BUSY;
3535 }
3536
3537 cmd->scsi_cmd = scsi_cmd;
3538 ioarcb = &(cmd->ioa_cb->ioarcb);
3539 memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3540 ioarcb->resource_handle = res->cfg_entry.resource_handle;
3541 ioarcb->request_type = REQ_TYPE_SCSI;
3542
3543 /* set hrrq number where the IOA should respond to. Note that all cmds
3544 * generated internally uses hrrq_id 0, exception to this is the cmd
3545 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3546 * hrrq_id assigned here in queuecommand
3547 */
3548 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3549 pinstance->num_hrrq;
3550 cmd->cmd_done = pmcraid_io_done;
3551
3552 if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3553 if (scsi_cmd->underflow == 0)
3554 ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3555
3556 if (res->sync_reqd) {
3557 ioarcb->request_flags0 |= SYNC_COMPLETE;
3558 res->sync_reqd = 0;
3559 }
3560
3561 ioarcb->request_flags0 |= NO_LINK_DESCS;
3562 ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);
3563
3564 if (RES_IS_GSCSI(res->cfg_entry))
3565 ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3566 }
3567
3568 rc = pmcraid_build_ioadl(pinstance, cmd);
3569
3570 pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3571 le32_to_cpu(ioarcb->response_handle) >> 2,
3572 scsi_cmd->cmnd[0], pinstance->host->unique_id,
3573 RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3574 PMCRAID_PHYS_BUS_ID,
3575 RES_IS_VSET(res->cfg_entry) ?
3576 (fw_version <= PMCRAID_FW_VERSION_1 ?
3577 res->cfg_entry.unique_flags1 :
3578 res->cfg_entry.array_id & 0xFF) :
3579 RES_TARGET(res->cfg_entry.resource_address),
3580 RES_LUN(res->cfg_entry.resource_address));
3581
3582 if (likely(rc == 0)) {
3583 _pmcraid_fire_command(cmd);
3584 } else {
3585 pmcraid_err("queuecommand could not build ioadl\n");
3586 pmcraid_return_cmd(cmd);
3587 rc = SCSI_MLQUEUE_HOST_BUSY;
3588 }
3589
3590 return rc;
3591}
3592
3593static DEF_SCSI_QCMD(pmcraid_queuecommand)
3594
3595/**
3596 * pmcraid_open -char node "open" entry, allowed only users with admin access
3597 */
3598static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3599{
3600 struct pmcraid_instance *pinstance;
3601
3602 if (!capable(CAP_SYS_ADMIN))
3603 return -EACCES;
3604
3605 /* Populate adapter instance * pointer for use by ioctl */
3606 pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3607 filep->private_data = pinstance;
3608
3609 return 0;
3610}
3611
3612/**
3613 * pmcraid_fasync - Async notifier registration from applications
3614 *
3615 * This function adds the calling process to a driver global queue. When an
3616 * event occurs, SIGIO will be sent to all processes in this queue.
3617 */
3618static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3619{
3620 struct pmcraid_instance *pinstance;
3621 int rc;
3622
3623 pinstance = filep->private_data;
3624 mutex_lock(&pinstance->aen_queue_lock);
3625 rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3626 mutex_unlock(&pinstance->aen_queue_lock);
3627
3628 return rc;
3629}
3630
3631
3632/**
3633 * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3634 * commands sent over IOCTL interface
3635 *
3636 * @cmd : pointer to struct pmcraid_cmd
3637 * @buflen : length of the request buffer
3638 * @direction : data transfer direction
3639 *
3640 * Return value
3641 * 0 on success, non-zero error code on failure
3642 */
3643static int pmcraid_build_passthrough_ioadls(
3644 struct pmcraid_cmd *cmd,
3645 int buflen,
3646 int direction
3647)
3648{
3649 struct pmcraid_sglist *sglist = NULL;
3650 struct scatterlist *sg = NULL;
3651 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3652 struct pmcraid_ioadl_desc *ioadl;
3653 int i;
3654
3655 sglist = pmcraid_alloc_sglist(buflen);
3656
3657 if (!sglist) {
3658 pmcraid_err("can't allocate memory for passthrough SGls\n");
3659 return -ENOMEM;
3660 }
3661
3662 sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
3663 sglist->scatterlist,
3664 sglist->num_sg, direction);
3665
3666 if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3667 dev_err(&cmd->drv_inst->pdev->dev,
3668 "Failed to map passthrough buffer!\n");
3669 pmcraid_free_sglist(sglist);
3670 return -EIO;
3671 }
3672
3673 cmd->sglist = sglist;
3674 ioarcb->request_flags0 |= NO_LINK_DESCS;
3675
3676 ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3677
3678 /* Initialize IOADL descriptor addresses */
3679 for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3680 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3681 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3682 ioadl[i].flags = 0;
3683 }
3684
3685 /* setup the last descriptor */
3686 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3687
3688 return 0;
3689}
3690
3691
3692/**
3693 * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3694 *
3695 * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3696 * @buflen: size of the request buffer
3697 * @direction: data transfer direction
3698 *
3699 * Return value
3700 * 0 on success, non-zero error code on failure
3701 */
3702static void pmcraid_release_passthrough_ioadls(
3703 struct pmcraid_cmd *cmd,
3704 int buflen,
3705 int direction
3706)
3707{
3708 struct pmcraid_sglist *sglist = cmd->sglist;
3709
3710 if (buflen > 0) {
3711 pci_unmap_sg(cmd->drv_inst->pdev,
3712 sglist->scatterlist,
3713 sglist->num_sg,
3714 direction);
3715 pmcraid_free_sglist(sglist);
3716 cmd->sglist = NULL;
3717 }
3718}
3719
3720/**
3721 * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3722 *
3723 * @pinstance: pointer to adapter instance structure
3724 * @cmd: ioctl code
3725 * @arg: pointer to pmcraid_passthrough_buffer user buffer
3726 *
3727 * Return value
3728 * 0 on success, non-zero error code on failure
3729 */
3730static long pmcraid_ioctl_passthrough(
3731 struct pmcraid_instance *pinstance,
3732 unsigned int ioctl_cmd,
3733 unsigned int buflen,
3734 unsigned long arg
3735)
3736{
3737 struct pmcraid_passthrough_ioctl_buffer *buffer;
3738 struct pmcraid_ioarcb *ioarcb;
3739 struct pmcraid_cmd *cmd;
3740 struct pmcraid_cmd *cancel_cmd;
3741 unsigned long request_buffer;
3742 unsigned long request_offset;
3743 unsigned long lock_flags;
3744 void *ioasa;
3745 u32 ioasc;
3746 int request_size;
3747 int buffer_size;
3748 u8 access, direction;
3749 int rc = 0;
3750
3751 /* If IOA reset is in progress, wait 10 secs for reset to complete */
3752 if (pinstance->ioa_reset_in_progress) {
3753 rc = wait_event_interruptible_timeout(
3754 pinstance->reset_wait_q,
3755 !pinstance->ioa_reset_in_progress,
3756 msecs_to_jiffies(10000));
3757
3758 if (!rc)
3759 return -ETIMEDOUT;
3760 else if (rc < 0)
3761 return -ERESTARTSYS;
3762 }
3763
3764 /* If adapter is not in operational state, return error */
3765 if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3766 pmcraid_err("IOA is not operational\n");
3767 return -ENOTTY;
3768 }
3769
3770 buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3771 buffer = kmalloc(buffer_size, GFP_KERNEL);
3772
3773 if (!buffer) {
3774 pmcraid_err("no memory for passthrough buffer\n");
3775 return -ENOMEM;
3776 }
3777
3778 request_offset =
3779 offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3780
3781 request_buffer = arg + request_offset;
3782
3783 rc = __copy_from_user(buffer,
3784 (struct pmcraid_passthrough_ioctl_buffer *) arg,
3785 sizeof(struct pmcraid_passthrough_ioctl_buffer));
3786
3787 ioasa =
3788 (void *)(arg +
3789 offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
3790
3791 if (rc) {
3792 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3793 rc = -EFAULT;
3794 goto out_free_buffer;
3795 }
3796
3797 request_size = buffer->ioarcb.data_transfer_length;
3798
3799 if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3800 access = VERIFY_READ;
3801 direction = DMA_TO_DEVICE;
3802 } else {
3803 access = VERIFY_WRITE;
3804 direction = DMA_FROM_DEVICE;
3805 }
3806
3807 if (request_size > 0) {
3808 rc = access_ok(access, arg, request_offset + request_size);
3809
3810 if (!rc) {
3811 rc = -EFAULT;
3812 goto out_free_buffer;
3813 }
3814 } else if (request_size < 0) {
3815 rc = -EINVAL;
3816 goto out_free_buffer;
3817 }
3818
3819 /* check if we have any additional command parameters */
3820 if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
3821 rc = -EINVAL;
3822 goto out_free_buffer;
3823 }
3824
3825 cmd = pmcraid_get_free_cmd(pinstance);
3826
3827 if (!cmd) {
3828 pmcraid_err("free command block is not available\n");
3829 rc = -ENOMEM;
3830 goto out_free_buffer;
3831 }
3832
3833 cmd->scsi_cmd = NULL;
3834 ioarcb = &(cmd->ioa_cb->ioarcb);
3835
3836 /* Copy the user-provided IOARCB stuff field by field */
3837 ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3838 ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3839 ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3840 ioarcb->request_type = buffer->ioarcb.request_type;
3841 ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3842 ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3843 memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3844
3845 if (buffer->ioarcb.add_cmd_param_length) {
3846 ioarcb->add_cmd_param_length =
3847 buffer->ioarcb.add_cmd_param_length;
3848 ioarcb->add_cmd_param_offset =
3849 buffer->ioarcb.add_cmd_param_offset;
3850 memcpy(ioarcb->add_data.u.add_cmd_params,
3851 buffer->ioarcb.add_data.u.add_cmd_params,
3852 buffer->ioarcb.add_cmd_param_length);
3853 }
3854
3855 /* set hrrq number where the IOA should respond to. Note that all cmds
3856 * generated internally uses hrrq_id 0, exception to this is the cmd
3857 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3858 * hrrq_id assigned here in queuecommand
3859 */
3860 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3861 pinstance->num_hrrq;
3862
3863 if (request_size) {
3864 rc = pmcraid_build_passthrough_ioadls(cmd,
3865 request_size,
3866 direction);
3867 if (rc) {
3868 pmcraid_err("couldn't build passthrough ioadls\n");
3869 goto out_free_buffer;
3870 }
3871 } else if (request_size < 0) {
3872 rc = -EINVAL;
3873 goto out_free_buffer;
3874 }
3875
3876 /* If data is being written into the device, copy the data from user
3877 * buffers
3878 */
3879 if (direction == DMA_TO_DEVICE && request_size > 0) {
3880 rc = pmcraid_copy_sglist(cmd->sglist,
3881 request_buffer,
3882 request_size,
3883 direction);
3884 if (rc) {
3885 pmcraid_err("failed to copy user buffer\n");
3886 goto out_free_sglist;
3887 }
3888 }
3889
3890 /* passthrough ioctl is a blocking command so, put the user to sleep
3891 * until timeout. Note that a timeout value of 0 means, do timeout.
3892 */
3893 cmd->cmd_done = pmcraid_internal_done;
3894 init_completion(&cmd->wait_for_completion);
3895 cmd->completion_req = 1;
3896
3897 pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3898 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3899 cmd->ioa_cb->ioarcb.cdb[0],
3900 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3901
3902 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3903 _pmcraid_fire_command(cmd);
3904 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3905
3906 /* NOTE ! Remove the below line once abort_task is implemented
3907 * in firmware. This line disables ioctl command timeout handling logic
3908 * similar to IO command timeout handling, making ioctl commands to wait
3909 * until the command completion regardless of timeout value specified in
3910 * ioarcb
3911 */
3912 buffer->ioarcb.cmd_timeout = 0;
3913
3914 /* If command timeout is specified put caller to wait till that time,
3915 * otherwise it would be blocking wait. If command gets timed out, it
3916 * will be aborted.
3917 */
3918 if (buffer->ioarcb.cmd_timeout == 0) {
3919 wait_for_completion(&cmd->wait_for_completion);
3920 } else if (!wait_for_completion_timeout(
3921 &cmd->wait_for_completion,
3922 msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
3923
3924 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3925 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
3926 cmd->ioa_cb->ioarcb.cdb[0]);
3927
3928 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3929 cancel_cmd = pmcraid_abort_cmd(cmd);
3930 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3931
3932 if (cancel_cmd) {
3933 wait_for_completion(&cancel_cmd->wait_for_completion);
3934 ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
3935 pmcraid_return_cmd(cancel_cmd);
3936
3937 /* if abort task couldn't find the command i.e it got
3938 * completed prior to aborting, return good completion.
3939 * if command got aborted successfully or there was IOA
3940 * reset due to abort task itself getting timedout then
3941 * return -ETIMEDOUT
3942 */
3943 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3944 PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3945 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3946 rc = -ETIMEDOUT;
3947 goto out_handle_response;
3948 }
3949 }
3950
3951 /* no command block for abort task or abort task failed to abort
3952 * the IOARCB, then wait for 150 more seconds and initiate reset
3953 * sequence after timeout
3954 */
3955 if (!wait_for_completion_timeout(
3956 &cmd->wait_for_completion,
3957 msecs_to_jiffies(150 * 1000))) {
3958 pmcraid_reset_bringup(cmd->drv_inst);
3959 rc = -ETIMEDOUT;
3960 }
3961 }
3962
3963out_handle_response:
3964 /* copy entire IOASA buffer and return IOCTL success.
3965 * If copying IOASA to user-buffer fails, return
3966 * EFAULT
3967 */
3968 if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3969 sizeof(struct pmcraid_ioasa))) {
3970 pmcraid_err("failed to copy ioasa buffer to user\n");
3971 rc = -EFAULT;
3972 }
3973
3974 /* If the data transfer was from device, copy the data onto user
3975 * buffers
3976 */
3977 else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3978 rc = pmcraid_copy_sglist(cmd->sglist,
3979 request_buffer,
3980 request_size,
3981 direction);
3982 if (rc) {
3983 pmcraid_err("failed to copy user buffer\n");
3984 rc = -EFAULT;
3985 }
3986 }
3987
3988out_free_sglist:
3989 pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3990 pmcraid_return_cmd(cmd);
3991
3992out_free_buffer:
3993 kfree(buffer);
3994
3995 return rc;
3996}
3997
3998
3999
4000
4001/**
4002 * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
4003 *
4004 * @pinstance: pointer to adapter instance structure
4005 * @cmd: ioctl command passed in
4006 * @buflen: length of user_buffer
4007 * @user_buffer: user buffer pointer
4008 *
4009 * Return Value
4010 * 0 in case of success, otherwise appropriate error code
4011 */
4012static long pmcraid_ioctl_driver(
4013 struct pmcraid_instance *pinstance,
4014 unsigned int cmd,
4015 unsigned int buflen,
4016 void __user *user_buffer
4017)
4018{
4019 int rc = -ENOSYS;
4020
4021 if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
4022 pmcraid_err("ioctl_driver: access fault in request buffer\n");
4023 return -EFAULT;
4024 }
4025
4026 switch (cmd) {
4027 case PMCRAID_IOCTL_RESET_ADAPTER:
4028 pmcraid_reset_bringup(pinstance);
4029 rc = 0;
4030 break;
4031
4032 default:
4033 break;
4034 }
4035
4036 return rc;
4037}
4038
4039/**
4040 * pmcraid_check_ioctl_buffer - check for proper access to user buffer
4041 *
4042 * @cmd: ioctl command
4043 * @arg: user buffer
4044 * @hdr: pointer to kernel memory for pmcraid_ioctl_header
4045 *
4046 * Return Value
4047 * negetive error code if there are access issues, otherwise zero.
4048 * Upon success, returns ioctl header copied out of user buffer.
4049 */
4050
4051static int pmcraid_check_ioctl_buffer(
4052 int cmd,
4053 void __user *arg,
4054 struct pmcraid_ioctl_header *hdr
4055)
4056{
4057 int rc = 0;
4058 int access = VERIFY_READ;
4059
4060 if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
4061 pmcraid_err("couldn't copy ioctl header from user buffer\n");
4062 return -EFAULT;
4063 }
4064
4065 /* check for valid driver signature */
4066 rc = memcmp(hdr->signature,
4067 PMCRAID_IOCTL_SIGNATURE,
4068 sizeof(hdr->signature));
4069 if (rc) {
4070 pmcraid_err("signature verification failed\n");
4071 return -EINVAL;
4072 }
4073
4074 /* check for appropriate buffer access */
4075 if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
4076 access = VERIFY_WRITE;
4077
4078 rc = access_ok(access,
4079 (arg + sizeof(struct pmcraid_ioctl_header)),
4080 hdr->buffer_length);
4081 if (!rc) {
4082 pmcraid_err("access failed for user buffer of size %d\n",
4083 hdr->buffer_length);
4084 return -EFAULT;
4085 }
4086
4087 return 0;
4088}
4089
4090/**
4091 * pmcraid_ioctl - char node ioctl entry point
4092 */
4093static long pmcraid_chr_ioctl(
4094 struct file *filep,
4095 unsigned int cmd,
4096 unsigned long arg
4097)
4098{
4099 struct pmcraid_instance *pinstance = NULL;
4100 struct pmcraid_ioctl_header *hdr = NULL;
4101 int retval = -ENOTTY;
4102
4103 hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
4104
4105 if (!hdr) {
4106 pmcraid_err("failed to allocate memory for ioctl header\n");
4107 return -ENOMEM;
4108 }
4109
4110 retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
4111
4112 if (retval) {
4113 pmcraid_info("chr_ioctl: header check failed\n");
4114 kfree(hdr);
4115 return retval;
4116 }
4117
4118 pinstance = filep->private_data;
4119
4120 if (!pinstance) {
4121 pmcraid_info("adapter instance is not found\n");
4122 kfree(hdr);
4123 return -ENOTTY;
4124 }
4125
4126 switch (_IOC_TYPE(cmd)) {
4127
4128 case PMCRAID_PASSTHROUGH_IOCTL:
4129 /* If ioctl code is to download microcode, we need to block
4130 * mid-layer requests.
4131 */
4132 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4133 scsi_block_requests(pinstance->host);
4134
4135 retval = pmcraid_ioctl_passthrough(pinstance,
4136 cmd,
4137 hdr->buffer_length,
4138 arg);
4139
4140 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4141 scsi_unblock_requests(pinstance->host);
4142 break;
4143
4144 case PMCRAID_DRIVER_IOCTL:
4145 arg += sizeof(struct pmcraid_ioctl_header);
4146 retval = pmcraid_ioctl_driver(pinstance,
4147 cmd,
4148 hdr->buffer_length,
4149 (void __user *)arg);
4150 break;
4151
4152 default:
4153 retval = -ENOTTY;
4154 break;
4155 }
4156
4157 kfree(hdr);
4158
4159 return retval;
4160}
4161
4162/**
4163 * File operations structure for management interface
4164 */
4165static const struct file_operations pmcraid_fops = {
4166 .owner = THIS_MODULE,
4167 .open = pmcraid_chr_open,
4168 .fasync = pmcraid_chr_fasync,
4169 .unlocked_ioctl = pmcraid_chr_ioctl,
4170#ifdef CONFIG_COMPAT
4171 .compat_ioctl = pmcraid_chr_ioctl,
4172#endif
4173 .llseek = noop_llseek,
4174};
4175
4176
4177
4178
4179/**
4180 * pmcraid_show_log_level - Display adapter's error logging level
4181 * @dev: class device struct
4182 * @buf: buffer
4183 *
4184 * Return value:
4185 * number of bytes printed to buffer
4186 */
4187static ssize_t pmcraid_show_log_level(
4188 struct device *dev,
4189 struct device_attribute *attr,
4190 char *buf)
4191{
4192 struct Scsi_Host *shost = class_to_shost(dev);
4193 struct pmcraid_instance *pinstance =
4194 (struct pmcraid_instance *)shost->hostdata;
4195 return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
4196}
4197
4198/**
4199 * pmcraid_store_log_level - Change the adapter's error logging level
4200 * @dev: class device struct
4201 * @buf: buffer
4202 * @count: not used
4203 *
4204 * Return value:
4205 * number of bytes printed to buffer
4206 */
4207static ssize_t pmcraid_store_log_level(
4208 struct device *dev,
4209 struct device_attribute *attr,
4210 const char *buf,
4211 size_t count
4212)
4213{
4214 struct Scsi_Host *shost;
4215 struct pmcraid_instance *pinstance;
4216 unsigned long val;
4217
4218 if (strict_strtoul(buf, 10, &val))
4219 return -EINVAL;
4220 /* log-level should be from 0 to 2 */
4221 if (val > 2)
4222 return -EINVAL;
4223
4224 shost = class_to_shost(dev);
4225 pinstance = (struct pmcraid_instance *)shost->hostdata;
4226 pinstance->current_log_level = val;
4227
4228 return strlen(buf);
4229}
4230
4231static struct device_attribute pmcraid_log_level_attr = {
4232 .attr = {
4233 .name = "log_level",
4234 .mode = S_IRUGO | S_IWUSR,
4235 },
4236 .show = pmcraid_show_log_level,
4237 .store = pmcraid_store_log_level,
4238};
4239
4240/**
4241 * pmcraid_show_drv_version - Display driver version
4242 * @dev: class device struct
4243 * @buf: buffer
4244 *
4245 * Return value:
4246 * number of bytes printed to buffer
4247 */
4248static ssize_t pmcraid_show_drv_version(
4249 struct device *dev,
4250 struct device_attribute *attr,
4251 char *buf
4252)
4253{
4254 return snprintf(buf, PAGE_SIZE, "version: %s\n",
4255 PMCRAID_DRIVER_VERSION);
4256}
4257
4258static struct device_attribute pmcraid_driver_version_attr = {
4259 .attr = {
4260 .name = "drv_version",
4261 .mode = S_IRUGO,
4262 },
4263 .show = pmcraid_show_drv_version,
4264};
4265
4266/**
4267 * pmcraid_show_io_adapter_id - Display driver assigned adapter id
4268 * @dev: class device struct
4269 * @buf: buffer
4270 *
4271 * Return value:
4272 * number of bytes printed to buffer
4273 */
4274static ssize_t pmcraid_show_adapter_id(
4275 struct device *dev,
4276 struct device_attribute *attr,
4277 char *buf
4278)
4279{
4280 struct Scsi_Host *shost = class_to_shost(dev);
4281 struct pmcraid_instance *pinstance =
4282 (struct pmcraid_instance *)shost->hostdata;
4283 u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4284 pinstance->pdev->devfn;
4285 u32 aen_group = pmcraid_event_family.id;
4286
4287 return snprintf(buf, PAGE_SIZE,
4288 "adapter id: %d\nminor: %d\naen group: %d\n",
4289 adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4290}
4291
4292static struct device_attribute pmcraid_adapter_id_attr = {
4293 .attr = {
4294 .name = "adapter_id",
4295 .mode = S_IRUGO | S_IWUSR,
4296 },
4297 .show = pmcraid_show_adapter_id,
4298};
4299
4300static struct device_attribute *pmcraid_host_attrs[] = {
4301 &pmcraid_log_level_attr,
4302 &pmcraid_driver_version_attr,
4303 &pmcraid_adapter_id_attr,
4304 NULL,
4305};
4306
4307
4308/* host template structure for pmcraid driver */
4309static struct scsi_host_template pmcraid_host_template = {
4310 .module = THIS_MODULE,
4311 .name = PMCRAID_DRIVER_NAME,
4312 .queuecommand = pmcraid_queuecommand,
4313 .eh_abort_handler = pmcraid_eh_abort_handler,
4314 .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4315 .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4316 .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4317 .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4318
4319 .slave_alloc = pmcraid_slave_alloc,
4320 .slave_configure = pmcraid_slave_configure,
4321 .slave_destroy = pmcraid_slave_destroy,
4322 .change_queue_depth = pmcraid_change_queue_depth,
4323 .change_queue_type = pmcraid_change_queue_type,
4324 .can_queue = PMCRAID_MAX_IO_CMD,
4325 .this_id = -1,
4326 .sg_tablesize = PMCRAID_MAX_IOADLS,
4327 .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4328 .no_write_same = 1,
4329 .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4330 .use_clustering = ENABLE_CLUSTERING,
4331 .shost_attrs = pmcraid_host_attrs,
4332 .proc_name = PMCRAID_DRIVER_NAME
4333};
4334
4335/*
4336 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4337 * @irq: interrupt vector number
4338 * @dev_id: pointer hrrq_vector
4339 *
4340 * Return Value
4341 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4342 */
4343
4344static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4345{
4346 struct pmcraid_isr_param *hrrq_vector;
4347 struct pmcraid_instance *pinstance;
4348 unsigned long lock_flags;
4349 u32 intrs_val;
4350 int hrrq_id;
4351
4352 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4353 hrrq_id = hrrq_vector->hrrq_id;
4354 pinstance = hrrq_vector->drv_inst;
4355
4356 if (!hrrq_id) {
4357 /* Read the interrupt */
4358 intrs_val = pmcraid_read_interrupts(pinstance);
4359 if (intrs_val &&
4360 ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4361 & DOORBELL_INTR_MSIX_CLR) == 0)) {
4362 /* Any error interrupts including unit_check,
4363 * initiate IOA reset.In case of unit check indicate
4364 * to reset_sequence that IOA unit checked and prepare
4365 * for a dump during reset sequence
4366 */
4367 if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4368 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4369 pinstance->ioa_unit_check = 1;
4370
4371 pmcraid_err("ISR: error interrupts: %x \
4372 initiating reset\n", intrs_val);
4373 spin_lock_irqsave(pinstance->host->host_lock,
4374 lock_flags);
4375 pmcraid_initiate_reset(pinstance);
4376 spin_unlock_irqrestore(
4377 pinstance->host->host_lock,
4378 lock_flags);
4379 }
4380 /* If interrupt was as part of the ioa initialization,
4381 * clear it. Delete the timer and wakeup the
4382 * reset engine to proceed with reset sequence
4383 */
4384 if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4385 pmcraid_clr_trans_op(pinstance);
4386
4387 /* Clear the interrupt register by writing
4388 * to host to ioa doorbell. Once done
4389 * FW will clear the interrupt.
4390 */
4391 iowrite32(DOORBELL_INTR_MSIX_CLR,
4392 pinstance->int_regs.host_ioa_interrupt_reg);
4393 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4394
4395
4396 }
4397 }
4398
4399 tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4400
4401 return IRQ_HANDLED;
4402}
4403
4404/**
4405 * pmcraid_isr - implements legacy interrupt handling routine
4406 *
4407 * @irq: interrupt vector number
4408 * @dev_id: pointer hrrq_vector
4409 *
4410 * Return Value
4411 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4412 */
4413static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4414{
4415 struct pmcraid_isr_param *hrrq_vector;
4416 struct pmcraid_instance *pinstance;
4417 u32 intrs;
4418 unsigned long lock_flags;
4419 int hrrq_id = 0;
4420
4421 /* In case of legacy interrupt mode where interrupts are shared across
4422 * isrs, it may be possible that the current interrupt is not from IOA
4423 */
4424 if (!dev_id) {
4425 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4426 return IRQ_NONE;
4427 }
4428 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4429 pinstance = hrrq_vector->drv_inst;
4430
4431 intrs = pmcraid_read_interrupts(pinstance);
4432
4433 if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4434 return IRQ_NONE;
4435
4436 /* Any error interrupts including unit_check, initiate IOA reset.
4437 * In case of unit check indicate to reset_sequence that IOA unit
4438 * checked and prepare for a dump during reset sequence
4439 */
4440 if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4441
4442 if (intrs & INTRS_IOA_UNIT_CHECK)
4443 pinstance->ioa_unit_check = 1;
4444
4445 iowrite32(intrs,
4446 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4447 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4448 intrs);
4449 intrs = ioread32(
4450 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4451 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4452 pmcraid_initiate_reset(pinstance);
4453 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4454 } else {
4455 /* If interrupt was as part of the ioa initialization,
4456 * clear. Delete the timer and wakeup the
4457 * reset engine to proceed with reset sequence
4458 */
4459 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4460 pmcraid_clr_trans_op(pinstance);
4461 } else {
4462 iowrite32(intrs,
4463 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4464 ioread32(
4465 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4466
4467 tasklet_schedule(
4468 &(pinstance->isr_tasklet[hrrq_id]));
4469 }
4470 }
4471
4472 return IRQ_HANDLED;
4473}
4474
4475
4476/**
4477 * pmcraid_worker_function - worker thread function
4478 *
4479 * @workp: pointer to struct work queue
4480 *
4481 * Return Value
4482 * None
4483 */
4484
4485static void pmcraid_worker_function(struct work_struct *workp)
4486{
4487 struct pmcraid_instance *pinstance;
4488 struct pmcraid_resource_entry *res;
4489 struct pmcraid_resource_entry *temp;
4490 struct scsi_device *sdev;
4491 unsigned long lock_flags;
4492 unsigned long host_lock_flags;
4493 u16 fw_version;
4494 u8 bus, target, lun;
4495
4496 pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4497 /* add resources only after host is added into system */
4498 if (!atomic_read(&pinstance->expose_resources))
4499 return;
4500
4501 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4502
4503 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4504 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4505
4506 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4507 sdev = res->scsi_dev;
4508
4509 /* host_lock must be held before calling
4510 * scsi_device_get
4511 */
4512 spin_lock_irqsave(pinstance->host->host_lock,
4513 host_lock_flags);
4514 if (!scsi_device_get(sdev)) {
4515 spin_unlock_irqrestore(
4516 pinstance->host->host_lock,
4517 host_lock_flags);
4518 pmcraid_info("deleting %x from midlayer\n",
4519 res->cfg_entry.resource_address);
4520 list_move_tail(&res->queue,
4521 &pinstance->free_res_q);
4522 spin_unlock_irqrestore(
4523 &pinstance->resource_lock,
4524 lock_flags);
4525 scsi_remove_device(sdev);
4526 scsi_device_put(sdev);
4527 spin_lock_irqsave(&pinstance->resource_lock,
4528 lock_flags);
4529 res->change_detected = 0;
4530 } else {
4531 spin_unlock_irqrestore(
4532 pinstance->host->host_lock,
4533 host_lock_flags);
4534 }
4535 }
4536 }
4537
4538 list_for_each_entry(res, &pinstance->used_res_q, queue) {
4539
4540 if (res->change_detected == RES_CHANGE_ADD) {
4541
4542 if (!pmcraid_expose_resource(fw_version,
4543 &res->cfg_entry))
4544 continue;
4545
4546 if (RES_IS_VSET(res->cfg_entry)) {
4547 bus = PMCRAID_VSET_BUS_ID;
4548 if (fw_version <= PMCRAID_FW_VERSION_1)
4549 target = res->cfg_entry.unique_flags1;
4550 else
4551 target = res->cfg_entry.array_id & 0xFF;
4552 lun = PMCRAID_VSET_LUN_ID;
4553 } else {
4554 bus = PMCRAID_PHYS_BUS_ID;
4555 target =
4556 RES_TARGET(
4557 res->cfg_entry.resource_address);
4558 lun = RES_LUN(res->cfg_entry.resource_address);
4559 }
4560
4561 res->change_detected = 0;
4562 spin_unlock_irqrestore(&pinstance->resource_lock,
4563 lock_flags);
4564 scsi_add_device(pinstance->host, bus, target, lun);
4565 spin_lock_irqsave(&pinstance->resource_lock,
4566 lock_flags);
4567 }
4568 }
4569
4570 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4571}
4572
4573/**
4574 * pmcraid_tasklet_function - Tasklet function
4575 *
4576 * @instance: pointer to msix param structure
4577 *
4578 * Return Value
4579 * None
4580 */
4581static void pmcraid_tasklet_function(unsigned long instance)
4582{
4583 struct pmcraid_isr_param *hrrq_vector;
4584 struct pmcraid_instance *pinstance;
4585 unsigned long hrrq_lock_flags;
4586 unsigned long pending_lock_flags;
4587 unsigned long host_lock_flags;
4588 spinlock_t *lockp; /* hrrq buffer lock */
4589 int id;
4590 __le32 resp;
4591
4592 hrrq_vector = (struct pmcraid_isr_param *)instance;
4593 pinstance = hrrq_vector->drv_inst;
4594 id = hrrq_vector->hrrq_id;
4595 lockp = &(pinstance->hrrq_lock[id]);
4596
4597 /* loop through each of the commands responded by IOA. Each HRRQ buf is
4598 * protected by its own lock. Traversals must be done within this lock
4599 * as there may be multiple tasklets running on multiple CPUs. Note
4600 * that the lock is held just for picking up the response handle and
4601 * manipulating hrrq_curr/toggle_bit values.
4602 */
4603 spin_lock_irqsave(lockp, hrrq_lock_flags);
4604
4605 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4606
4607 while ((resp & HRRQ_TOGGLE_BIT) ==
4608 pinstance->host_toggle_bit[id]) {
4609
4610 int cmd_index = resp >> 2;
4611 struct pmcraid_cmd *cmd = NULL;
4612
4613 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4614 pinstance->hrrq_curr[id]++;
4615 } else {
4616 pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4617 pinstance->host_toggle_bit[id] ^= 1u;
4618 }
4619
4620 if (cmd_index >= PMCRAID_MAX_CMD) {
4621 /* In case of invalid response handle, log message */
4622 pmcraid_err("Invalid response handle %d\n", cmd_index);
4623 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4624 continue;
4625 }
4626
4627 cmd = pinstance->cmd_list[cmd_index];
4628 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4629
4630 spin_lock_irqsave(&pinstance->pending_pool_lock,
4631 pending_lock_flags);
4632 list_del(&cmd->free_list);
4633 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4634 pending_lock_flags);
4635 del_timer(&cmd->timer);
4636 atomic_dec(&pinstance->outstanding_cmds);
4637
4638 if (cmd->cmd_done == pmcraid_ioa_reset) {
4639 spin_lock_irqsave(pinstance->host->host_lock,
4640 host_lock_flags);
4641 cmd->cmd_done(cmd);
4642 spin_unlock_irqrestore(pinstance->host->host_lock,
4643 host_lock_flags);
4644 } else if (cmd->cmd_done != NULL) {
4645 cmd->cmd_done(cmd);
4646 }
4647 /* loop over until we are done with all responses */
4648 spin_lock_irqsave(lockp, hrrq_lock_flags);
4649 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4650 }
4651
4652 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4653}
4654
4655/**
4656 * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4657 * @pinstance: pointer to adapter instance structure
4658 *
4659 * This routine un-registers registered interrupt handler and
4660 * also frees irqs/vectors.
4661 *
4662 * Retun Value
4663 * None
4664 */
4665static
4666void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4667{
4668 int i;
4669
4670 for (i = 0; i < pinstance->num_hrrq; i++)
4671 free_irq(pinstance->hrrq_vector[i].vector,
4672 &(pinstance->hrrq_vector[i]));
4673
4674 if (pinstance->interrupt_mode) {
4675 pci_disable_msix(pinstance->pdev);
4676 pinstance->interrupt_mode = 0;
4677 }
4678}
4679
4680/**
4681 * pmcraid_register_interrupt_handler - registers interrupt handler
4682 * @pinstance: pointer to per-adapter instance structure
4683 *
4684 * Return Value
4685 * 0 on success, non-zero error code otherwise.
4686 */
4687static int
4688pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4689{
4690 int rc;
4691 struct pci_dev *pdev = pinstance->pdev;
4692
4693 if ((pmcraid_enable_msix) &&
4694 (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
4695 int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
4696 struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
4697 int i;
4698 for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
4699 entries[i].entry = i;
4700
4701 rc = pci_enable_msix(pdev, entries, num_hrrq);
4702 if (rc < 0)
4703 goto pmcraid_isr_legacy;
4704
4705 /* Check how many MSIX vectors are allocated and register
4706 * msi-x handlers for each of them giving appropriate buffer
4707 */
4708 if (rc > 0) {
4709 num_hrrq = rc;
4710 if (pci_enable_msix(pdev, entries, num_hrrq))
4711 goto pmcraid_isr_legacy;
4712 }
4713
4714 for (i = 0; i < num_hrrq; i++) {
4715 pinstance->hrrq_vector[i].hrrq_id = i;
4716 pinstance->hrrq_vector[i].drv_inst = pinstance;
4717 pinstance->hrrq_vector[i].vector = entries[i].vector;
4718 rc = request_irq(pinstance->hrrq_vector[i].vector,
4719 pmcraid_isr_msix, 0,
4720 PMCRAID_DRIVER_NAME,
4721 &(pinstance->hrrq_vector[i]));
4722
4723 if (rc) {
4724 int j;
4725 for (j = 0; j < i; j++)
4726 free_irq(entries[j].vector,
4727 &(pinstance->hrrq_vector[j]));
4728 pci_disable_msix(pdev);
4729 goto pmcraid_isr_legacy;
4730 }
4731 }
4732
4733 pinstance->num_hrrq = num_hrrq;
4734 pinstance->interrupt_mode = 1;
4735 iowrite32(DOORBELL_INTR_MODE_MSIX,
4736 pinstance->int_regs.host_ioa_interrupt_reg);
4737 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4738 goto pmcraid_isr_out;
4739 }
4740
4741pmcraid_isr_legacy:
4742 /* If MSI-X registration failed fallback to legacy mode, where
4743 * only one hrrq entry will be used
4744 */
4745 pinstance->hrrq_vector[0].hrrq_id = 0;
4746 pinstance->hrrq_vector[0].drv_inst = pinstance;
4747 pinstance->hrrq_vector[0].vector = pdev->irq;
4748 pinstance->num_hrrq = 1;
4749 rc = 0;
4750
4751 rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
4752 PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
4753pmcraid_isr_out:
4754 return rc;
4755}
4756
4757/**
4758 * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4759 * @pinstance: per adapter instance structure pointer
4760 * @max_index: number of buffer blocks to release
4761 *
4762 * Return Value
4763 * None
4764 */
4765static void
4766pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4767{
4768 int i;
4769 for (i = 0; i < max_index; i++) {
4770 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4771 pinstance->cmd_list[i] = NULL;
4772 }
4773 kmem_cache_destroy(pinstance->cmd_cachep);
4774 pinstance->cmd_cachep = NULL;
4775}
4776
4777/**
4778 * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4779 * @pinstance: pointer to per adapter instance structure
4780 * @max_index: number of buffers (from 0 onwards) to release
4781 *
4782 * This function assumes that the command blocks for which control blocks are
4783 * linked are not released.
4784 *
4785 * Return Value
4786 * None
4787 */
4788static void
4789pmcraid_release_control_blocks(
4790 struct pmcraid_instance *pinstance,
4791 int max_index
4792)
4793{
4794 int i;
4795
4796 if (pinstance->control_pool == NULL)
4797 return;
4798
4799 for (i = 0; i < max_index; i++) {
4800 pci_pool_free(pinstance->control_pool,
4801 pinstance->cmd_list[i]->ioa_cb,
4802 pinstance->cmd_list[i]->ioa_cb_bus_addr);
4803 pinstance->cmd_list[i]->ioa_cb = NULL;
4804 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4805 }
4806 pci_pool_destroy(pinstance->control_pool);
4807 pinstance->control_pool = NULL;
4808}
4809
4810/**
4811 * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4812 * @pinstance - pointer to per adapter instance structure
4813 *
4814 * Allocates memory for command blocks using kernel slab allocator.
4815 *
4816 * Return Value
4817 * 0 in case of success; -ENOMEM in case of failure
4818 */
4819static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4820{
4821 int i;
4822
4823 sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4824 pinstance->host->unique_id);
4825
4826
4827 pinstance->cmd_cachep = kmem_cache_create(
4828 pinstance->cmd_pool_name,
4829 sizeof(struct pmcraid_cmd), 0,
4830 SLAB_HWCACHE_ALIGN, NULL);
4831 if (!pinstance->cmd_cachep)
4832 return -ENOMEM;
4833
4834 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4835 pinstance->cmd_list[i] =
4836 kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4837 if (!pinstance->cmd_list[i]) {
4838 pmcraid_release_cmd_blocks(pinstance, i);
4839 return -ENOMEM;
4840 }
4841 }
4842 return 0;
4843}
4844
4845/**
4846 * pmcraid_allocate_control_blocks - allocates memory control blocks
4847 * @pinstance : pointer to per adapter instance structure
4848 *
4849 * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4850 * and IOASAs. This is called after command blocks are already allocated.
4851 *
4852 * Return Value
4853 * 0 in case it can allocate all control blocks, otherwise -ENOMEM
4854 */
4855static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4856{
4857 int i;
4858
4859 sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4860 pinstance->host->unique_id);
4861
4862 pinstance->control_pool =
4863 pci_pool_create(pinstance->ctl_pool_name,
4864 pinstance->pdev,
4865 sizeof(struct pmcraid_control_block),
4866 PMCRAID_IOARCB_ALIGNMENT, 0);
4867
4868 if (!pinstance->control_pool)
4869 return -ENOMEM;
4870
4871 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4872 pinstance->cmd_list[i]->ioa_cb =
4873 pci_pool_alloc(
4874 pinstance->control_pool,
4875 GFP_KERNEL,
4876 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4877
4878 if (!pinstance->cmd_list[i]->ioa_cb) {
4879 pmcraid_release_control_blocks(pinstance, i);
4880 return -ENOMEM;
4881 }
4882 memset(pinstance->cmd_list[i]->ioa_cb, 0,
4883 sizeof(struct pmcraid_control_block));
4884 }
4885 return 0;
4886}
4887
4888/**
4889 * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4890 * @pinstance: pointer to per adapter instance structure
4891 * @maxindex: size of hrrq buffer pointer array
4892 *
4893 * Return Value
4894 * None
4895 */
4896static void
4897pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4898{
4899 int i;
4900 for (i = 0; i < maxindex; i++) {
4901
4902 pci_free_consistent(pinstance->pdev,
4903 HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4904 pinstance->hrrq_start[i],
4905 pinstance->hrrq_start_bus_addr[i]);
4906
4907 /* reset pointers and toggle bit to zeros */
4908 pinstance->hrrq_start[i] = NULL;
4909 pinstance->hrrq_start_bus_addr[i] = 0;
4910 pinstance->host_toggle_bit[i] = 0;
4911 }
4912}
4913
4914/**
4915 * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4916 * @pinstance: pointer to per adapter instance structure
4917 *
4918 * Return value
4919 * 0 hrrq buffers are allocated, -ENOMEM otherwise.
4920 */
4921static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4922{
4923 int i, buffer_size;
4924
4925 buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4926
4927 for (i = 0; i < pinstance->num_hrrq; i++) {
4928 pinstance->hrrq_start[i] =
4929 pci_alloc_consistent(
4930 pinstance->pdev,
4931 buffer_size,
4932 &(pinstance->hrrq_start_bus_addr[i]));
4933
4934 if (pinstance->hrrq_start[i] == 0) {
4935 pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4936 i);
4937 pmcraid_release_host_rrqs(pinstance, i);
4938 return -ENOMEM;
4939 }
4940
4941 memset(pinstance->hrrq_start[i], 0, buffer_size);
4942 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4943 pinstance->hrrq_end[i] =
4944 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4945 pinstance->host_toggle_bit[i] = 1;
4946 spin_lock_init(&pinstance->hrrq_lock[i]);
4947 }
4948 return 0;
4949}
4950
4951/**
4952 * pmcraid_release_hcams - release HCAM buffers
4953 *
4954 * @pinstance: pointer to per adapter instance structure
4955 *
4956 * Return value
4957 * none
4958 */
4959static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4960{
4961 if (pinstance->ccn.msg != NULL) {
4962 pci_free_consistent(pinstance->pdev,
4963 PMCRAID_AEN_HDR_SIZE +
4964 sizeof(struct pmcraid_hcam_ccn_ext),
4965 pinstance->ccn.msg,
4966 pinstance->ccn.baddr);
4967
4968 pinstance->ccn.msg = NULL;
4969 pinstance->ccn.hcam = NULL;
4970 pinstance->ccn.baddr = 0;
4971 }
4972
4973 if (pinstance->ldn.msg != NULL) {
4974 pci_free_consistent(pinstance->pdev,
4975 PMCRAID_AEN_HDR_SIZE +
4976 sizeof(struct pmcraid_hcam_ldn),
4977 pinstance->ldn.msg,
4978 pinstance->ldn.baddr);
4979
4980 pinstance->ldn.msg = NULL;
4981 pinstance->ldn.hcam = NULL;
4982 pinstance->ldn.baddr = 0;
4983 }
4984}
4985
4986/**
4987 * pmcraid_allocate_hcams - allocates HCAM buffers
4988 * @pinstance : pointer to per adapter instance structure
4989 *
4990 * Return Value:
4991 * 0 in case of successful allocation, non-zero otherwise
4992 */
4993static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4994{
4995 pinstance->ccn.msg = pci_alloc_consistent(
4996 pinstance->pdev,
4997 PMCRAID_AEN_HDR_SIZE +
4998 sizeof(struct pmcraid_hcam_ccn_ext),
4999 &(pinstance->ccn.baddr));
5000
5001 pinstance->ldn.msg = pci_alloc_consistent(
5002 pinstance->pdev,
5003 PMCRAID_AEN_HDR_SIZE +
5004 sizeof(struct pmcraid_hcam_ldn),
5005 &(pinstance->ldn.baddr));
5006
5007 if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
5008 pmcraid_release_hcams(pinstance);
5009 } else {
5010 pinstance->ccn.hcam =
5011 (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
5012 pinstance->ldn.hcam =
5013 (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
5014
5015 atomic_set(&pinstance->ccn.ignore, 0);
5016 atomic_set(&pinstance->ldn.ignore, 0);
5017 }
5018
5019 return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
5020}
5021
5022/**
5023 * pmcraid_release_config_buffers - release config.table buffers
5024 * @pinstance: pointer to per adapter instance structure
5025 *
5026 * Return Value
5027 * none
5028 */
5029static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
5030{
5031 if (pinstance->cfg_table != NULL &&
5032 pinstance->cfg_table_bus_addr != 0) {
5033 pci_free_consistent(pinstance->pdev,
5034 sizeof(struct pmcraid_config_table),
5035 pinstance->cfg_table,
5036 pinstance->cfg_table_bus_addr);
5037 pinstance->cfg_table = NULL;
5038 pinstance->cfg_table_bus_addr = 0;
5039 }
5040
5041 if (pinstance->res_entries != NULL) {
5042 int i;
5043
5044 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5045 list_del(&pinstance->res_entries[i].queue);
5046 kfree(pinstance->res_entries);
5047 pinstance->res_entries = NULL;
5048 }
5049
5050 pmcraid_release_hcams(pinstance);
5051}
5052
5053/**
5054 * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
5055 * @pinstance : pointer to per adapter instance structure
5056 *
5057 * Return Value
5058 * 0 for successful allocation, -ENOMEM for any failure
5059 */
5060static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
5061{
5062 int i;
5063
5064 pinstance->res_entries =
5065 kzalloc(sizeof(struct pmcraid_resource_entry) *
5066 PMCRAID_MAX_RESOURCES, GFP_KERNEL);
5067
5068 if (NULL == pinstance->res_entries) {
5069 pmcraid_err("failed to allocate memory for resource table\n");
5070 return -ENOMEM;
5071 }
5072
5073 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5074 list_add_tail(&pinstance->res_entries[i].queue,
5075 &pinstance->free_res_q);
5076
5077 pinstance->cfg_table =
5078 pci_alloc_consistent(pinstance->pdev,
5079 sizeof(struct pmcraid_config_table),
5080 &pinstance->cfg_table_bus_addr);
5081
5082 if (NULL == pinstance->cfg_table) {
5083 pmcraid_err("couldn't alloc DMA memory for config table\n");
5084 pmcraid_release_config_buffers(pinstance);
5085 return -ENOMEM;
5086 }
5087
5088 if (pmcraid_allocate_hcams(pinstance)) {
5089 pmcraid_err("could not alloc DMA memory for HCAMS\n");
5090 pmcraid_release_config_buffers(pinstance);
5091 return -ENOMEM;
5092 }
5093
5094 return 0;
5095}
5096
5097/**
5098 * pmcraid_init_tasklets - registers tasklets for response handling
5099 *
5100 * @pinstance: pointer adapter instance structure
5101 *
5102 * Return value
5103 * none
5104 */
5105static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
5106{
5107 int i;
5108 for (i = 0; i < pinstance->num_hrrq; i++)
5109 tasklet_init(&pinstance->isr_tasklet[i],
5110 pmcraid_tasklet_function,
5111 (unsigned long)&pinstance->hrrq_vector[i]);
5112}
5113
5114/**
5115 * pmcraid_kill_tasklets - destroys tasklets registered for response handling
5116 *
5117 * @pinstance: pointer to adapter instance structure
5118 *
5119 * Return value
5120 * none
5121 */
5122static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
5123{
5124 int i;
5125 for (i = 0; i < pinstance->num_hrrq; i++)
5126 tasklet_kill(&pinstance->isr_tasklet[i]);
5127}
5128
5129/**
5130 * pmcraid_release_buffers - release per-adapter buffers allocated
5131 *
5132 * @pinstance: pointer to adapter soft state
5133 *
5134 * Return Value
5135 * none
5136 */
5137static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
5138{
5139 pmcraid_release_config_buffers(pinstance);
5140 pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
5141 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5142 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5143
5144 if (pinstance->inq_data != NULL) {
5145 pci_free_consistent(pinstance->pdev,
5146 sizeof(struct pmcraid_inquiry_data),
5147 pinstance->inq_data,
5148 pinstance->inq_data_baddr);
5149
5150 pinstance->inq_data = NULL;
5151 pinstance->inq_data_baddr = 0;
5152 }
5153
5154 if (pinstance->timestamp_data != NULL) {
5155 pci_free_consistent(pinstance->pdev,
5156 sizeof(struct pmcraid_timestamp_data),
5157 pinstance->timestamp_data,
5158 pinstance->timestamp_data_baddr);
5159
5160 pinstance->timestamp_data = NULL;
5161 pinstance->timestamp_data_baddr = 0;
5162 }
5163}
5164
5165/**
5166 * pmcraid_init_buffers - allocates memory and initializes various structures
5167 * @pinstance: pointer to per adapter instance structure
5168 *
5169 * This routine pre-allocates memory based on the type of block as below:
5170 * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
5171 * IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator
5172 * config-table entries : DMAable memory using pci_alloc_consistent
5173 * HostRRQs : DMAable memory, using pci_alloc_consistent
5174 *
5175 * Return Value
5176 * 0 in case all of the blocks are allocated, -ENOMEM otherwise.
5177 */
5178static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
5179{
5180 int i;
5181
5182 if (pmcraid_allocate_host_rrqs(pinstance)) {
5183 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
5184 pinstance->num_hrrq);
5185 return -ENOMEM;
5186 }
5187
5188 if (pmcraid_allocate_config_buffers(pinstance)) {
5189 pmcraid_err("couldn't allocate memory for config buffers\n");
5190 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5191 return -ENOMEM;
5192 }
5193
5194 if (pmcraid_allocate_cmd_blocks(pinstance)) {
5195 pmcraid_err("couldn't allocate memory for cmd blocks\n");
5196 pmcraid_release_config_buffers(pinstance);
5197 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5198 return -ENOMEM;
5199 }
5200
5201 if (pmcraid_allocate_control_blocks(pinstance)) {
5202 pmcraid_err("couldn't allocate memory control blocks\n");
5203 pmcraid_release_config_buffers(pinstance);
5204 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5205 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5206 return -ENOMEM;
5207 }
5208
5209 /* allocate DMAable memory for page D0 INQUIRY buffer */
5210 pinstance->inq_data = pci_alloc_consistent(
5211 pinstance->pdev,
5212 sizeof(struct pmcraid_inquiry_data),
5213 &pinstance->inq_data_baddr);
5214
5215 if (pinstance->inq_data == NULL) {
5216 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
5217 pmcraid_release_buffers(pinstance);
5218 return -ENOMEM;
5219 }
5220
5221 /* allocate DMAable memory for set timestamp data buffer */
5222 pinstance->timestamp_data = pci_alloc_consistent(
5223 pinstance->pdev,
5224 sizeof(struct pmcraid_timestamp_data),
5225 &pinstance->timestamp_data_baddr);
5226
5227 if (pinstance->timestamp_data == NULL) {
5228 pmcraid_err("couldn't allocate DMA memory for \
5229 set time_stamp \n");
5230 pmcraid_release_buffers(pinstance);
5231 return -ENOMEM;
5232 }
5233
5234
5235 /* Initialize all the command blocks and add them to free pool. No
5236 * need to lock (free_pool_lock) as this is done in initialization
5237 * itself
5238 */
5239 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5240 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5241 pmcraid_init_cmdblk(cmdp, i);
5242 cmdp->drv_inst = pinstance;
5243 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5244 }
5245
5246 return 0;
5247}
5248
5249/**
5250 * pmcraid_reinit_buffers - resets various buffer pointers
5251 * @pinstance: pointer to adapter instance
5252 * Return value
5253 * none
5254 */
5255static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5256{
5257 int i;
5258 int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5259
5260 for (i = 0; i < pinstance->num_hrrq; i++) {
5261 memset(pinstance->hrrq_start[i], 0, buffer_size);
5262 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5263 pinstance->hrrq_end[i] =
5264 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5265 pinstance->host_toggle_bit[i] = 1;
5266 }
5267}
5268
5269/**
5270 * pmcraid_init_instance - initialize per instance data structure
5271 * @pdev: pointer to pci device structure
5272 * @host: pointer to Scsi_Host structure
5273 * @mapped_pci_addr: memory mapped IOA configuration registers
5274 *
5275 * Return Value
5276 * 0 on success, non-zero in case of any failure
5277 */
5278static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
5279 void __iomem *mapped_pci_addr)
5280{
5281 struct pmcraid_instance *pinstance =
5282 (struct pmcraid_instance *)host->hostdata;
5283
5284 pinstance->host = host;
5285 pinstance->pdev = pdev;
5286
5287 /* Initialize register addresses */
5288 pinstance->mapped_dma_addr = mapped_pci_addr;
5289
5290 /* Initialize chip-specific details */
5291 {
5292 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5293 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5294
5295 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5296
5297 pint_regs->ioa_host_interrupt_reg =
5298 mapped_pci_addr + chip_cfg->ioa_host_intr;
5299 pint_regs->ioa_host_interrupt_clr_reg =
5300 mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5301 pint_regs->ioa_host_msix_interrupt_reg =
5302 mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5303 pint_regs->host_ioa_interrupt_reg =
5304 mapped_pci_addr + chip_cfg->host_ioa_intr;
5305 pint_regs->host_ioa_interrupt_clr_reg =
5306 mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5307
5308 /* Current version of firmware exposes interrupt mask set
5309 * and mask clr registers through memory mapped bar0.
5310 */
5311 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5312 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5313 pint_regs->ioa_host_interrupt_mask_reg =
5314 mapped_pci_addr + chip_cfg->ioa_host_mask;
5315 pint_regs->ioa_host_interrupt_mask_clr_reg =
5316 mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5317 pint_regs->global_interrupt_mask_reg =
5318 mapped_pci_addr + chip_cfg->global_intr_mask;
5319 };
5320
5321 pinstance->ioa_reset_attempts = 0;
5322 init_waitqueue_head(&pinstance->reset_wait_q);
5323
5324 atomic_set(&pinstance->outstanding_cmds, 0);
5325 atomic_set(&pinstance->last_message_id, 0);
5326 atomic_set(&pinstance->expose_resources, 0);
5327
5328 INIT_LIST_HEAD(&pinstance->free_res_q);
5329 INIT_LIST_HEAD(&pinstance->used_res_q);
5330 INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5331 INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5332
5333 spin_lock_init(&pinstance->free_pool_lock);
5334 spin_lock_init(&pinstance->pending_pool_lock);
5335 spin_lock_init(&pinstance->resource_lock);
5336 mutex_init(&pinstance->aen_queue_lock);
5337
5338 /* Work-queue (Shared) for deferred processing error handling */
5339 INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5340
5341 /* Initialize the default log_level */
5342 pinstance->current_log_level = pmcraid_log_level;
5343
5344 /* Setup variables required for reset engine */
5345 pinstance->ioa_state = IOA_STATE_UNKNOWN;
5346 pinstance->reset_cmd = NULL;
5347 return 0;
5348}
5349
5350/**
5351 * pmcraid_shutdown - shutdown adapter controller.
5352 * @pdev: pci device struct
5353 *
5354 * Issues an adapter shutdown to the card waits for its completion
5355 *
5356 * Return value
5357 * none
5358 */
5359static void pmcraid_shutdown(struct pci_dev *pdev)
5360{
5361 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5362 pmcraid_reset_bringdown(pinstance);
5363}
5364
5365
5366/**
5367 * pmcraid_get_minor - returns unused minor number from minor number bitmap
5368 */
5369static unsigned short pmcraid_get_minor(void)
5370{
5371 int minor;
5372
5373 minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
5374 __set_bit(minor, pmcraid_minor);
5375 return minor;
5376}
5377
5378/**
5379 * pmcraid_release_minor - releases given minor back to minor number bitmap
5380 */
5381static void pmcraid_release_minor(unsigned short minor)
5382{
5383 __clear_bit(minor, pmcraid_minor);
5384}
5385
5386/**
5387 * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5388 *
5389 * @pinstance: pointer to adapter instance for which to register device
5390 *
5391 * Return value
5392 * 0 in case of success, otherwise non-zero
5393 */
5394static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5395{
5396 int minor;
5397 int error;
5398
5399 minor = pmcraid_get_minor();
5400 cdev_init(&pinstance->cdev, &pmcraid_fops);
5401 pinstance->cdev.owner = THIS_MODULE;
5402
5403 error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5404
5405 if (error)
5406 pmcraid_release_minor(minor);
5407 else
5408 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5409 NULL, "%s%u", PMCRAID_DEVFILE, minor);
5410 return error;
5411}
5412
5413/**
5414 * pmcraid_release_chrdev - unregisters per-adapter management interface
5415 *
5416 * @pinstance: pointer to adapter instance structure
5417 *
5418 * Return value
5419 * none
5420 */
5421static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5422{
5423 pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5424 device_destroy(pmcraid_class,
5425 MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5426 cdev_del(&pinstance->cdev);
5427}
5428
5429/**
5430 * pmcraid_remove - IOA hot plug remove entry point
5431 * @pdev: pci device struct
5432 *
5433 * Return value
5434 * none
5435 */
5436static void pmcraid_remove(struct pci_dev *pdev)
5437{
5438 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5439
5440 /* remove the management interface (/dev file) for this device */
5441 pmcraid_release_chrdev(pinstance);
5442
5443 /* remove host template from scsi midlayer */
5444 scsi_remove_host(pinstance->host);
5445
5446 /* block requests from mid-layer */
5447 scsi_block_requests(pinstance->host);
5448
5449 /* initiate shutdown adapter */
5450 pmcraid_shutdown(pdev);
5451
5452 pmcraid_disable_interrupts(pinstance, ~0);
5453 flush_work(&pinstance->worker_q);
5454
5455 pmcraid_kill_tasklets(pinstance);
5456 pmcraid_unregister_interrupt_handler(pinstance);
5457 pmcraid_release_buffers(pinstance);
5458 iounmap(pinstance->mapped_dma_addr);
5459 pci_release_regions(pdev);
5460 scsi_host_put(pinstance->host);
5461 pci_disable_device(pdev);
5462
5463 return;
5464}
5465
5466#ifdef CONFIG_PM
5467/**
5468 * pmcraid_suspend - driver suspend entry point for power management
5469 * @pdev: PCI device structure
5470 * @state: PCI power state to suspend routine
5471 *
5472 * Return Value - 0 always
5473 */
5474static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
5475{
5476 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5477
5478 pmcraid_shutdown(pdev);
5479 pmcraid_disable_interrupts(pinstance, ~0);
5480 pmcraid_kill_tasklets(pinstance);
5481 pci_set_drvdata(pinstance->pdev, pinstance);
5482 pmcraid_unregister_interrupt_handler(pinstance);
5483 pci_save_state(pdev);
5484 pci_disable_device(pdev);
5485 pci_set_power_state(pdev, pci_choose_state(pdev, state));
5486
5487 return 0;
5488}
5489
5490/**
5491 * pmcraid_resume - driver resume entry point PCI power management
5492 * @pdev: PCI device structure
5493 *
5494 * Return Value - 0 in case of success. Error code in case of any failure
5495 */
5496static int pmcraid_resume(struct pci_dev *pdev)
5497{
5498 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5499 struct Scsi_Host *host = pinstance->host;
5500 int rc;
5501
5502 pci_set_power_state(pdev, PCI_D0);
5503 pci_enable_wake(pdev, PCI_D0, 0);
5504 pci_restore_state(pdev);
5505
5506 rc = pci_enable_device(pdev);
5507
5508 if (rc) {
5509 dev_err(&pdev->dev, "resume: Enable device failed\n");
5510 return rc;
5511 }
5512
5513 pci_set_master(pdev);
5514
5515 if ((sizeof(dma_addr_t) == 4) ||
5516 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5517 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5518
5519 if (rc == 0)
5520 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5521
5522 if (rc != 0) {
5523 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5524 goto disable_device;
5525 }
5526
5527 pmcraid_disable_interrupts(pinstance, ~0);
5528 atomic_set(&pinstance->outstanding_cmds, 0);
5529 rc = pmcraid_register_interrupt_handler(pinstance);
5530
5531 if (rc) {
5532 dev_err(&pdev->dev,
5533 "resume: couldn't register interrupt handlers\n");
5534 rc = -ENODEV;
5535 goto release_host;
5536 }
5537
5538 pmcraid_init_tasklets(pinstance);
5539 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5540
5541 /* Start with hard reset sequence which brings up IOA to operational
5542 * state as well as completes the reset sequence.
5543 */
5544 pinstance->ioa_hard_reset = 1;
5545
5546 /* Start IOA firmware initialization and bring card to Operational
5547 * state.
5548 */
5549 if (pmcraid_reset_bringup(pinstance)) {
5550 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5551 rc = -ENODEV;
5552 goto release_tasklets;
5553 }
5554
5555 return 0;
5556
5557release_tasklets:
5558 pmcraid_disable_interrupts(pinstance, ~0);
5559 pmcraid_kill_tasklets(pinstance);
5560 pmcraid_unregister_interrupt_handler(pinstance);
5561
5562release_host:
5563 scsi_host_put(host);
5564
5565disable_device:
5566 pci_disable_device(pdev);
5567
5568 return rc;
5569}
5570
5571#else
5572
5573#define pmcraid_suspend NULL
5574#define pmcraid_resume NULL
5575
5576#endif /* CONFIG_PM */
5577
5578/**
5579 * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5580 * completion of the ioa reset
5581 * @cmd: pointer to reset command block
5582 */
5583static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5584{
5585 struct pmcraid_instance *pinstance = cmd->drv_inst;
5586 unsigned long flags;
5587
5588 spin_lock_irqsave(pinstance->host->host_lock, flags);
5589 pmcraid_ioa_reset(cmd);
5590 spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5591 scsi_unblock_requests(pinstance->host);
5592 schedule_work(&pinstance->worker_q);
5593}
5594
5595/**
5596 * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5597 *
5598 * @cmd: pointer to pmcraid_cmd structure
5599 *
5600 * Return Value
5601 * 0 for success or non-zero for failure cases
5602 */
5603static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5604{
5605 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5606 void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5607
5608 pmcraid_reinit_cmdblk(cmd);
5609
5610 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5611 ioarcb->request_type = REQ_TYPE_IOACMD;
5612 ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5613 ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5614
5615 /* If this was called as part of resource table reinitialization due to
5616 * lost CCN, it is enough to return the command block back to free pool
5617 * as part of set_supported_devs completion function.
5618 */
5619 if (cmd->drv_inst->reinit_cfg_table) {
5620 cmd->drv_inst->reinit_cfg_table = 0;
5621 cmd->release = 1;
5622 cmd_done = pmcraid_reinit_cfgtable_done;
5623 }
5624
5625 /* we will be done with the reset sequence after set supported devices,
5626 * setup the done function to return the command block back to free
5627 * pool
5628 */
5629 pmcraid_send_cmd(cmd,
5630 cmd_done,
5631 PMCRAID_SET_SUP_DEV_TIMEOUT,
5632 pmcraid_timeout_handler);
5633 return;
5634}
5635
5636/**
5637 * pmcraid_set_timestamp - set the timestamp to IOAFP
5638 *
5639 * @cmd: pointer to pmcraid_cmd structure
5640 *
5641 * Return Value
5642 * 0 for success or non-zero for failure cases
5643 */
5644static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5645{
5646 struct pmcraid_instance *pinstance = cmd->drv_inst;
5647 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5648 __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5649 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5650
5651 struct timeval tv;
5652 __le64 timestamp;
5653
5654 do_gettimeofday(&tv);
5655 timestamp = tv.tv_sec * 1000;
5656
5657 pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5658 pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5659 pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5660 pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5661 pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5662 pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp) >> 40);
5663
5664 pmcraid_reinit_cmdblk(cmd);
5665 ioarcb->request_type = REQ_TYPE_SCSI;
5666 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5667 ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5668 ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5669 memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5670
5671 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5672 offsetof(struct pmcraid_ioarcb,
5673 add_data.u.ioadl[0]));
5674 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5675 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5676
5677 ioarcb->request_flags0 |= NO_LINK_DESCS;
5678 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5679 ioarcb->data_transfer_length =
5680 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5681 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5682 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5683 ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5684 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5685
5686 if (!pinstance->timestamp_error) {
5687 pinstance->timestamp_error = 0;
5688 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5689 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5690 } else {
5691 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5692 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5693 return;
5694 }
5695}
5696
5697
5698/**
5699 * pmcraid_init_res_table - Initialize the resource table
5700 * @cmd: pointer to pmcraid command struct
5701 *
5702 * This function looks through the existing resource table, comparing
5703 * it with the config table. This function will take care of old/new
5704 * devices and schedule adding/removing them from the mid-layer
5705 * as appropriate.
5706 *
5707 * Return value
5708 * None
5709 */
5710static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5711{
5712 struct pmcraid_instance *pinstance = cmd->drv_inst;
5713 struct pmcraid_resource_entry *res, *temp;
5714 struct pmcraid_config_table_entry *cfgte;
5715 unsigned long lock_flags;
5716 int found, rc, i;
5717 u16 fw_version;
5718 LIST_HEAD(old_res);
5719
5720 if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5721 pmcraid_err("IOA requires microcode download\n");
5722
5723 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5724
5725 /* resource list is protected by pinstance->resource_lock.
5726 * init_res_table can be called from probe (user-thread) or runtime
5727 * reset (timer/tasklet)
5728 */
5729 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5730
5731 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5732 list_move_tail(&res->queue, &old_res);
5733
5734 for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
5735 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5736 PMCRAID_FW_VERSION_1)
5737 cfgte = &pinstance->cfg_table->entries[i];
5738 else
5739 cfgte = (struct pmcraid_config_table_entry *)
5740 &pinstance->cfg_table->entries_ext[i];
5741
5742 if (!pmcraid_expose_resource(fw_version, cfgte))
5743 continue;
5744
5745 found = 0;
5746
5747 /* If this entry was already detected and initialized */
5748 list_for_each_entry_safe(res, temp, &old_res, queue) {
5749
5750 rc = memcmp(&res->cfg_entry.resource_address,
5751 &cfgte->resource_address,
5752 sizeof(cfgte->resource_address));
5753 if (!rc) {
5754 list_move_tail(&res->queue,
5755 &pinstance->used_res_q);
5756 found = 1;
5757 break;
5758 }
5759 }
5760
5761 /* If this is new entry, initialize it and add it the queue */
5762 if (!found) {
5763
5764 if (list_empty(&pinstance->free_res_q)) {
5765 pmcraid_err("Too many devices attached\n");
5766 break;
5767 }
5768
5769 found = 1;
5770 res = list_entry(pinstance->free_res_q.next,
5771 struct pmcraid_resource_entry, queue);
5772
5773 res->scsi_dev = NULL;
5774 res->change_detected = RES_CHANGE_ADD;
5775 res->reset_progress = 0;
5776 list_move_tail(&res->queue, &pinstance->used_res_q);
5777 }
5778
5779 /* copy new configuration table entry details into driver
5780 * maintained resource entry
5781 */
5782 if (found) {
5783 memcpy(&res->cfg_entry, cfgte,
5784 pinstance->config_table_entry_size);
5785 pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5786 res->cfg_entry.resource_type,
5787 (fw_version <= PMCRAID_FW_VERSION_1 ?
5788 res->cfg_entry.unique_flags1 :
5789 res->cfg_entry.array_id & 0xFF),
5790 le32_to_cpu(res->cfg_entry.resource_address));
5791 }
5792 }
5793
5794 /* Detect any deleted entries, mark them for deletion from mid-layer */
5795 list_for_each_entry_safe(res, temp, &old_res, queue) {
5796
5797 if (res->scsi_dev) {
5798 res->change_detected = RES_CHANGE_DEL;
5799 res->cfg_entry.resource_handle =
5800 PMCRAID_INVALID_RES_HANDLE;
5801 list_move_tail(&res->queue, &pinstance->used_res_q);
5802 } else {
5803 list_move_tail(&res->queue, &pinstance->free_res_q);
5804 }
5805 }
5806
5807 /* release the resource list lock */
5808 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5809 pmcraid_set_timestamp(cmd);
5810}
5811
5812/**
5813 * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5814 * @cmd: pointer pmcraid_cmd struct
5815 *
5816 * This function sends a Query IOA Configuration command to the adapter to
5817 * retrieve the IOA configuration table.
5818 *
5819 * Return value:
5820 * none
5821 */
5822static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5823{
5824 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5825 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5826 struct pmcraid_instance *pinstance = cmd->drv_inst;
5827 int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5828
5829 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5830 PMCRAID_FW_VERSION_1)
5831 pinstance->config_table_entry_size =
5832 sizeof(struct pmcraid_config_table_entry);
5833 else
5834 pinstance->config_table_entry_size =
5835 sizeof(struct pmcraid_config_table_entry_ext);
5836
5837 ioarcb->request_type = REQ_TYPE_IOACMD;
5838 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5839
5840 ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5841
5842 /* firmware requires 4-byte length field, specified in B.E format */
5843 memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5844
5845 /* Since entire config table can be described by single IOADL, it can
5846 * be part of IOARCB itself
5847 */
5848 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5849 offsetof(struct pmcraid_ioarcb,
5850 add_data.u.ioadl[0]));
5851 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5852 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5853
5854 ioarcb->request_flags0 |= NO_LINK_DESCS;
5855 ioarcb->data_transfer_length =
5856 cpu_to_le32(sizeof(struct pmcraid_config_table));
5857
5858 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5859 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5860 ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5861 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5862
5863 pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5864 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5865}
5866
5867
5868/**
5869 * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5870 * @pdev: pointer to pci device structure
5871 * @dev_id: pointer to device ids structure
5872 *
5873 * Return Value
5874 * returns 0 if the device is claimed and successfully configured.
5875 * returns non-zero error code in case of any failure
5876 */
5877static int pmcraid_probe(struct pci_dev *pdev,
5878 const struct pci_device_id *dev_id)
5879{
5880 struct pmcraid_instance *pinstance;
5881 struct Scsi_Host *host;
5882 void __iomem *mapped_pci_addr;
5883 int rc = PCIBIOS_SUCCESSFUL;
5884
5885 if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5886 pmcraid_err
5887 ("maximum number(%d) of supported adapters reached\n",
5888 atomic_read(&pmcraid_adapter_count));
5889 return -ENOMEM;
5890 }
5891
5892 atomic_inc(&pmcraid_adapter_count);
5893 rc = pci_enable_device(pdev);
5894
5895 if (rc) {
5896 dev_err(&pdev->dev, "Cannot enable adapter\n");
5897 atomic_dec(&pmcraid_adapter_count);
5898 return rc;
5899 }
5900
5901 dev_info(&pdev->dev,
5902 "Found new IOA(%x:%x), Total IOA count: %d\n",
5903 pdev->vendor, pdev->device,
5904 atomic_read(&pmcraid_adapter_count));
5905
5906 rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5907
5908 if (rc < 0) {
5909 dev_err(&pdev->dev,
5910 "Couldn't register memory range of registers\n");
5911 goto out_disable_device;
5912 }
5913
5914 mapped_pci_addr = pci_iomap(pdev, 0, 0);
5915
5916 if (!mapped_pci_addr) {
5917 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5918 rc = -ENOMEM;
5919 goto out_release_regions;
5920 }
5921
5922 pci_set_master(pdev);
5923
5924 /* Firmware requires the system bus address of IOARCB to be within
5925 * 32-bit addressable range though it has 64-bit IOARRIN register.
5926 * However, firmware supports 64-bit streaming DMA buffers, whereas
5927 * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
5928 * returns memory within 4GB (if not, change this logic), coherent
5929 * buffers are within firmware acceptable address ranges.
5930 */
5931 if ((sizeof(dma_addr_t) == 4) ||
5932 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5933 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5934
5935 /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5936 * bit mask for pci_alloc_consistent to return addresses within 4GB
5937 */
5938 if (rc == 0)
5939 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5940
5941 if (rc != 0) {
5942 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5943 goto cleanup_nomem;
5944 }
5945
5946 host = scsi_host_alloc(&pmcraid_host_template,
5947 sizeof(struct pmcraid_instance));
5948
5949 if (!host) {
5950 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5951 rc = -ENOMEM;
5952 goto cleanup_nomem;
5953 }
5954
5955 host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5956 host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5957 host->unique_id = host->host_no;
5958 host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5959 host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5960
5961 /* zero out entire instance structure */
5962 pinstance = (struct pmcraid_instance *)host->hostdata;
5963 memset(pinstance, 0, sizeof(*pinstance));
5964
5965 pinstance->chip_cfg =
5966 (struct pmcraid_chip_details *)(dev_id->driver_data);
5967
5968 rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5969
5970 if (rc < 0) {
5971 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5972 goto out_scsi_host_put;
5973 }
5974
5975 pci_set_drvdata(pdev, pinstance);
5976
5977 /* Save PCI config-space for use following the reset */
5978 rc = pci_save_state(pinstance->pdev);
5979
5980 if (rc != 0) {
5981 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5982 goto out_scsi_host_put;
5983 }
5984
5985 pmcraid_disable_interrupts(pinstance, ~0);
5986
5987 rc = pmcraid_register_interrupt_handler(pinstance);
5988
5989 if (rc) {
5990 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5991 goto out_scsi_host_put;
5992 }
5993
5994 pmcraid_init_tasklets(pinstance);
5995
5996 /* allocate verious buffers used by LLD.*/
5997 rc = pmcraid_init_buffers(pinstance);
5998
5999 if (rc) {
6000 pmcraid_err("couldn't allocate memory blocks\n");
6001 goto out_unregister_isr;
6002 }
6003
6004 /* check the reset type required */
6005 pmcraid_reset_type(pinstance);
6006
6007 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
6008
6009 /* Start IOA firmware initialization and bring card to Operational
6010 * state.
6011 */
6012 pmcraid_info("starting IOA initialization sequence\n");
6013 if (pmcraid_reset_bringup(pinstance)) {
6014 dev_err(&pdev->dev, "couldn't initialize IOA\n");
6015 rc = 1;
6016 goto out_release_bufs;
6017 }
6018
6019 /* Add adapter instance into mid-layer list */
6020 rc = scsi_add_host(pinstance->host, &pdev->dev);
6021 if (rc != 0) {
6022 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
6023 goto out_release_bufs;
6024 }
6025
6026 scsi_scan_host(pinstance->host);
6027
6028 rc = pmcraid_setup_chrdev(pinstance);
6029
6030 if (rc != 0) {
6031 pmcraid_err("couldn't create mgmt interface, error: %x\n",
6032 rc);
6033 goto out_remove_host;
6034 }
6035
6036 /* Schedule worker thread to handle CCN and take care of adding and
6037 * removing devices to OS
6038 */
6039 atomic_set(&pinstance->expose_resources, 1);
6040 schedule_work(&pinstance->worker_q);
6041 return rc;
6042
6043out_remove_host:
6044 scsi_remove_host(host);
6045
6046out_release_bufs:
6047 pmcraid_release_buffers(pinstance);
6048
6049out_unregister_isr:
6050 pmcraid_kill_tasklets(pinstance);
6051 pmcraid_unregister_interrupt_handler(pinstance);
6052
6053out_scsi_host_put:
6054 scsi_host_put(host);
6055
6056cleanup_nomem:
6057 iounmap(mapped_pci_addr);
6058
6059out_release_regions:
6060 pci_release_regions(pdev);
6061
6062out_disable_device:
6063 atomic_dec(&pmcraid_adapter_count);
6064 pci_disable_device(pdev);
6065 return -ENODEV;
6066}
6067
6068/*
6069 * PCI driver structure of pcmraid driver
6070 */
6071static struct pci_driver pmcraid_driver = {
6072 .name = PMCRAID_DRIVER_NAME,
6073 .id_table = pmcraid_pci_table,
6074 .probe = pmcraid_probe,
6075 .remove = pmcraid_remove,
6076 .suspend = pmcraid_suspend,
6077 .resume = pmcraid_resume,
6078 .shutdown = pmcraid_shutdown
6079};
6080
6081/**
6082 * pmcraid_init - module load entry point
6083 */
6084static int __init pmcraid_init(void)
6085{
6086 dev_t dev;
6087 int error;
6088
6089 pmcraid_info("%s Device Driver version: %s\n",
6090 PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
6091
6092 error = alloc_chrdev_region(&dev, 0,
6093 PMCRAID_MAX_ADAPTERS,
6094 PMCRAID_DEVFILE);
6095
6096 if (error) {
6097 pmcraid_err("failed to get a major number for adapters\n");
6098 goto out_init;
6099 }
6100
6101 pmcraid_major = MAJOR(dev);
6102 pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
6103
6104 if (IS_ERR(pmcraid_class)) {
6105 error = PTR_ERR(pmcraid_class);
6106 pmcraid_err("failed to register with sysfs, error = %x\n",
6107 error);
6108 goto out_unreg_chrdev;
6109 }
6110
6111 error = pmcraid_netlink_init();
6112
6113 if (error)
6114 goto out_unreg_chrdev;
6115
6116 error = pci_register_driver(&pmcraid_driver);
6117
6118 if (error == 0)
6119 goto out_init;
6120
6121 pmcraid_err("failed to register pmcraid driver, error = %x\n",
6122 error);
6123 class_destroy(pmcraid_class);
6124 pmcraid_netlink_release();
6125
6126out_unreg_chrdev:
6127 unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
6128
6129out_init:
6130 return error;
6131}
6132
6133/**
6134 * pmcraid_exit - module unload entry point
6135 */
6136static void __exit pmcraid_exit(void)
6137{
6138 pmcraid_netlink_release();
6139 unregister_chrdev_region(MKDEV(pmcraid_major, 0),
6140 PMCRAID_MAX_ADAPTERS);
6141 pci_unregister_driver(&pmcraid_driver);
6142 class_destroy(pmcraid_class);
6143}
6144
6145module_init(pmcraid_init);
6146module_exit(pmcraid_exit);
1/*
2 * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
3 *
4 * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
5 * PMC-Sierra Inc
6 *
7 * Copyright (C) 2008, 2009 PMC Sierra Inc
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
22 * USA
23 *
24 */
25#include <linux/fs.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/errno.h>
29#include <linux/kernel.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/pci.h>
33#include <linux/wait.h>
34#include <linux/spinlock.h>
35#include <linux/sched.h>
36#include <linux/interrupt.h>
37#include <linux/blkdev.h>
38#include <linux/firmware.h>
39#include <linux/module.h>
40#include <linux/moduleparam.h>
41#include <linux/hdreg.h>
42#include <linux/io.h>
43#include <linux/slab.h>
44#include <asm/irq.h>
45#include <asm/processor.h>
46#include <linux/libata.h>
47#include <linux/mutex.h>
48#include <scsi/scsi.h>
49#include <scsi/scsi_host.h>
50#include <scsi/scsi_device.h>
51#include <scsi/scsi_tcq.h>
52#include <scsi/scsi_eh.h>
53#include <scsi/scsi_cmnd.h>
54#include <scsi/scsicam.h>
55
56#include "pmcraid.h"
57
58/*
59 * Module configuration parameters
60 */
61static unsigned int pmcraid_debug_log;
62static unsigned int pmcraid_disable_aen;
63static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
64static unsigned int pmcraid_enable_msix;
65
66/*
67 * Data structures to support multiple adapters by the LLD.
68 * pmcraid_adapter_count - count of configured adapters
69 */
70static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
71
72/*
73 * Supporting user-level control interface through IOCTL commands.
74 * pmcraid_major - major number to use
75 * pmcraid_minor - minor number(s) to use
76 */
77static unsigned int pmcraid_major;
78static struct class *pmcraid_class;
79DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
80
81/*
82 * Module parameters
83 */
84MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
85MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
86MODULE_LICENSE("GPL");
87MODULE_VERSION(PMCRAID_DRIVER_VERSION);
88
89module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
90MODULE_PARM_DESC(log_level,
91 "Enables firmware error code logging, default :1 high-severity"
92 " errors, 2: all errors including high-severity errors,"
93 " 0: disables logging");
94
95module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
96MODULE_PARM_DESC(debug,
97 "Enable driver verbose message logging. Set 1 to enable."
98 "(default: 0)");
99
100module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
101MODULE_PARM_DESC(disable_aen,
102 "Disable driver aen notifications to apps. Set 1 to disable."
103 "(default: 0)");
104
105/* chip specific constants for PMC MaxRAID controllers (same for
106 * 0x5220 and 0x8010
107 */
108static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
109 {
110 .ioastatus = 0x0,
111 .ioarrin = 0x00040,
112 .mailbox = 0x7FC30,
113 .global_intr_mask = 0x00034,
114 .ioa_host_intr = 0x0009C,
115 .ioa_host_intr_clr = 0x000A0,
116 .ioa_host_msix_intr = 0x7FC40,
117 .ioa_host_mask = 0x7FC28,
118 .ioa_host_mask_clr = 0x7FC28,
119 .host_ioa_intr = 0x00020,
120 .host_ioa_intr_clr = 0x00020,
121 .transop_timeout = 300
122 }
123};
124
125/*
126 * PCI device ids supported by pmcraid driver
127 */
128static struct pci_device_id pmcraid_pci_table[] __devinitdata = {
129 { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
130 0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
131 },
132 {}
133};
134
135MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
136
137
138
139/**
140 * pmcraid_slave_alloc - Prepare for commands to a device
141 * @scsi_dev: scsi device struct
142 *
143 * This function is called by mid-layer prior to sending any command to the new
144 * device. Stores resource entry details of the device in scsi_device struct.
145 * Queuecommand uses the resource handle and other details to fill up IOARCB
146 * while sending commands to the device.
147 *
148 * Return value:
149 * 0 on success / -ENXIO if device does not exist
150 */
151static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
152{
153 struct pmcraid_resource_entry *temp, *res = NULL;
154 struct pmcraid_instance *pinstance;
155 u8 target, bus, lun;
156 unsigned long lock_flags;
157 int rc = -ENXIO;
158 u16 fw_version;
159
160 pinstance = shost_priv(scsi_dev->host);
161
162 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
163
164 /* Driver exposes VSET and GSCSI resources only; all other device types
165 * are not exposed. Resource list is synchronized using resource lock
166 * so any traversal or modifications to the list should be done inside
167 * this lock
168 */
169 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
170 list_for_each_entry(temp, &pinstance->used_res_q, queue) {
171
172 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
173 if (RES_IS_VSET(temp->cfg_entry)) {
174 if (fw_version <= PMCRAID_FW_VERSION_1)
175 target = temp->cfg_entry.unique_flags1;
176 else
177 target = temp->cfg_entry.array_id & 0xFF;
178
179 if (target > PMCRAID_MAX_VSET_TARGETS)
180 continue;
181 bus = PMCRAID_VSET_BUS_ID;
182 lun = 0;
183 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
184 target = RES_TARGET(temp->cfg_entry.resource_address);
185 bus = PMCRAID_PHYS_BUS_ID;
186 lun = RES_LUN(temp->cfg_entry.resource_address);
187 } else {
188 continue;
189 }
190
191 if (bus == scsi_dev->channel &&
192 target == scsi_dev->id &&
193 lun == scsi_dev->lun) {
194 res = temp;
195 break;
196 }
197 }
198
199 if (res) {
200 res->scsi_dev = scsi_dev;
201 scsi_dev->hostdata = res;
202 res->change_detected = 0;
203 atomic_set(&res->read_failures, 0);
204 atomic_set(&res->write_failures, 0);
205 rc = 0;
206 }
207 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
208 return rc;
209}
210
211/**
212 * pmcraid_slave_configure - Configures a SCSI device
213 * @scsi_dev: scsi device struct
214 *
215 * This function is executed by SCSI mid layer just after a device is first
216 * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
217 * timeout value (default 30s) will be over-written to a higher value (60s)
218 * and max_sectors value will be over-written to 512. It also sets queue depth
219 * to host->cmd_per_lun value
220 *
221 * Return value:
222 * 0 on success
223 */
224static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
225{
226 struct pmcraid_resource_entry *res = scsi_dev->hostdata;
227
228 if (!res)
229 return 0;
230
231 /* LLD exposes VSETs and Enclosure devices only */
232 if (RES_IS_GSCSI(res->cfg_entry) &&
233 scsi_dev->type != TYPE_ENCLOSURE)
234 return -ENXIO;
235
236 pmcraid_info("configuring %x:%x:%x:%x\n",
237 scsi_dev->host->unique_id,
238 scsi_dev->channel,
239 scsi_dev->id,
240 scsi_dev->lun);
241
242 if (RES_IS_GSCSI(res->cfg_entry)) {
243 scsi_dev->allow_restart = 1;
244 } else if (RES_IS_VSET(res->cfg_entry)) {
245 scsi_dev->allow_restart = 1;
246 blk_queue_rq_timeout(scsi_dev->request_queue,
247 PMCRAID_VSET_IO_TIMEOUT);
248 blk_queue_max_hw_sectors(scsi_dev->request_queue,
249 PMCRAID_VSET_MAX_SECTORS);
250 }
251
252 if (scsi_dev->tagged_supported &&
253 (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
254 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
255 scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
256 scsi_dev->host->cmd_per_lun);
257 } else {
258 scsi_adjust_queue_depth(scsi_dev, 0,
259 scsi_dev->host->cmd_per_lun);
260 }
261
262 return 0;
263}
264
265/**
266 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
267 *
268 * @scsi_dev: scsi device struct
269 *
270 * This is called by mid-layer before removing a device. Pointer assignments
271 * done in pmcraid_slave_alloc will be reset to NULL here.
272 *
273 * Return value
274 * none
275 */
276static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
277{
278 struct pmcraid_resource_entry *res;
279
280 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
281
282 if (res)
283 res->scsi_dev = NULL;
284
285 scsi_dev->hostdata = NULL;
286}
287
288/**
289 * pmcraid_change_queue_depth - Change the device's queue depth
290 * @scsi_dev: scsi device struct
291 * @depth: depth to set
292 * @reason: calling context
293 *
294 * Return value
295 * actual depth set
296 */
297static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
298 int reason)
299{
300 if (reason != SCSI_QDEPTH_DEFAULT)
301 return -EOPNOTSUPP;
302
303 if (depth > PMCRAID_MAX_CMD_PER_LUN)
304 depth = PMCRAID_MAX_CMD_PER_LUN;
305
306 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
307
308 return scsi_dev->queue_depth;
309}
310
311/**
312 * pmcraid_change_queue_type - Change the device's queue type
313 * @scsi_dev: scsi device struct
314 * @tag: type of tags to use
315 *
316 * Return value:
317 * actual queue type set
318 */
319static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
320{
321 struct pmcraid_resource_entry *res;
322
323 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
324
325 if ((res) && scsi_dev->tagged_supported &&
326 (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
327 scsi_set_tag_type(scsi_dev, tag);
328
329 if (tag)
330 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
331 else
332 scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
333 } else
334 tag = 0;
335
336 return tag;
337}
338
339
340/**
341 * pmcraid_init_cmdblk - initializes a command block
342 *
343 * @cmd: pointer to struct pmcraid_cmd to be initialized
344 * @index: if >=0 first time initialization; otherwise reinitialization
345 *
346 * Return Value
347 * None
348 */
349void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
350{
351 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
352 dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
353
354 if (index >= 0) {
355 /* first time initialization (called from probe) */
356 u32 ioasa_offset =
357 offsetof(struct pmcraid_control_block, ioasa);
358
359 cmd->index = index;
360 ioarcb->response_handle = cpu_to_le32(index << 2);
361 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
362 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
363 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
364 } else {
365 /* re-initialization of various lengths, called once command is
366 * processed by IOA
367 */
368 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
369 ioarcb->hrrq_id = 0;
370 ioarcb->request_flags0 = 0;
371 ioarcb->request_flags1 = 0;
372 ioarcb->cmd_timeout = 0;
373 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
374 ioarcb->ioadl_bus_addr = 0;
375 ioarcb->ioadl_length = 0;
376 ioarcb->data_transfer_length = 0;
377 ioarcb->add_cmd_param_length = 0;
378 ioarcb->add_cmd_param_offset = 0;
379 cmd->ioa_cb->ioasa.ioasc = 0;
380 cmd->ioa_cb->ioasa.residual_data_length = 0;
381 cmd->time_left = 0;
382 }
383
384 cmd->cmd_done = NULL;
385 cmd->scsi_cmd = NULL;
386 cmd->release = 0;
387 cmd->completion_req = 0;
388 cmd->sense_buffer = 0;
389 cmd->sense_buffer_dma = 0;
390 cmd->dma_handle = 0;
391 init_timer(&cmd->timer);
392}
393
394/**
395 * pmcraid_reinit_cmdblk - reinitialize a command block
396 *
397 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
398 *
399 * Return Value
400 * None
401 */
402static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
403{
404 pmcraid_init_cmdblk(cmd, -1);
405}
406
407/**
408 * pmcraid_get_free_cmd - get a free cmd block from command block pool
409 * @pinstance: adapter instance structure
410 *
411 * Return Value:
412 * returns pointer to cmd block or NULL if no blocks are available
413 */
414static struct pmcraid_cmd *pmcraid_get_free_cmd(
415 struct pmcraid_instance *pinstance
416)
417{
418 struct pmcraid_cmd *cmd = NULL;
419 unsigned long lock_flags;
420
421 /* free cmd block list is protected by free_pool_lock */
422 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
423
424 if (!list_empty(&pinstance->free_cmd_pool)) {
425 cmd = list_entry(pinstance->free_cmd_pool.next,
426 struct pmcraid_cmd, free_list);
427 list_del(&cmd->free_list);
428 }
429 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
430
431 /* Initialize the command block before giving it the caller */
432 if (cmd != NULL)
433 pmcraid_reinit_cmdblk(cmd);
434 return cmd;
435}
436
437/**
438 * pmcraid_return_cmd - return a completed command block back into free pool
439 * @cmd: pointer to the command block
440 *
441 * Return Value:
442 * nothing
443 */
444void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
445{
446 struct pmcraid_instance *pinstance = cmd->drv_inst;
447 unsigned long lock_flags;
448
449 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
450 list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
451 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
452}
453
454/**
455 * pmcraid_read_interrupts - reads IOA interrupts
456 *
457 * @pinstance: pointer to adapter instance structure
458 *
459 * Return value
460 * interrupts read from IOA
461 */
462static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
463{
464 return (pinstance->interrupt_mode) ?
465 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
466 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
467}
468
469/**
470 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
471 *
472 * @pinstance: pointer to per adapter instance structure
473 * @intrs: interrupts to disable
474 *
475 * Return Value
476 * None
477 */
478static void pmcraid_disable_interrupts(
479 struct pmcraid_instance *pinstance,
480 u32 intrs
481)
482{
483 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
484 u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
485
486 iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
487 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
488 ioread32(pinstance->int_regs.global_interrupt_mask_reg);
489
490 if (!pinstance->interrupt_mode) {
491 iowrite32(intrs,
492 pinstance->int_regs.ioa_host_interrupt_mask_reg);
493 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
494 }
495}
496
497/**
498 * pmcraid_enable_interrupts - Enables specified interrupts
499 *
500 * @pinstance: pointer to per adapter instance structure
501 * @intr: interrupts to enable
502 *
503 * Return Value
504 * None
505 */
506static void pmcraid_enable_interrupts(
507 struct pmcraid_instance *pinstance,
508 u32 intrs
509)
510{
511 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
512 u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
513
514 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
515
516 if (!pinstance->interrupt_mode) {
517 iowrite32(~intrs,
518 pinstance->int_regs.ioa_host_interrupt_mask_reg);
519 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
520 }
521
522 pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
523 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
524 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
525}
526
527/**
528 * pmcraid_clr_trans_op - clear trans to op interrupt
529 *
530 * @pinstance: pointer to per adapter instance structure
531 *
532 * Return Value
533 * None
534 */
535static void pmcraid_clr_trans_op(
536 struct pmcraid_instance *pinstance
537)
538{
539 unsigned long lock_flags;
540
541 if (!pinstance->interrupt_mode) {
542 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
543 pinstance->int_regs.ioa_host_interrupt_mask_reg);
544 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
545 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
546 pinstance->int_regs.ioa_host_interrupt_clr_reg);
547 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
548 }
549
550 if (pinstance->reset_cmd != NULL) {
551 del_timer(&pinstance->reset_cmd->timer);
552 spin_lock_irqsave(
553 pinstance->host->host_lock, lock_flags);
554 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
555 spin_unlock_irqrestore(
556 pinstance->host->host_lock, lock_flags);
557 }
558}
559
560/**
561 * pmcraid_reset_type - Determine the required reset type
562 * @pinstance: pointer to adapter instance structure
563 *
564 * IOA requires hard reset if any of the following conditions is true.
565 * 1. If HRRQ valid interrupt is not masked
566 * 2. IOA reset alert doorbell is set
567 * 3. If there are any error interrupts
568 */
569static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
570{
571 u32 mask;
572 u32 intrs;
573 u32 alerts;
574
575 mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
576 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
577 alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
578
579 if ((mask & INTRS_HRRQ_VALID) == 0 ||
580 (alerts & DOORBELL_IOA_RESET_ALERT) ||
581 (intrs & PMCRAID_ERROR_INTERRUPTS)) {
582 pmcraid_info("IOA requires hard reset\n");
583 pinstance->ioa_hard_reset = 1;
584 }
585
586 /* If unit check is active, trigger the dump */
587 if (intrs & INTRS_IOA_UNIT_CHECK)
588 pinstance->ioa_unit_check = 1;
589}
590
591/**
592 * pmcraid_bist_done - completion function for PCI BIST
593 * @cmd: pointer to reset command
594 * Return Value
595 * none
596 */
597
598static void pmcraid_ioa_reset(struct pmcraid_cmd *);
599
600static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
601{
602 struct pmcraid_instance *pinstance = cmd->drv_inst;
603 unsigned long lock_flags;
604 int rc;
605 u16 pci_reg;
606
607 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
608
609 /* If PCI config space can't be accessed wait for another two secs */
610 if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
611 cmd->time_left > 0) {
612 pmcraid_info("BIST not complete, waiting another 2 secs\n");
613 cmd->timer.expires = jiffies + cmd->time_left;
614 cmd->time_left = 0;
615 cmd->timer.data = (unsigned long)cmd;
616 cmd->timer.function =
617 (void (*)(unsigned long))pmcraid_bist_done;
618 add_timer(&cmd->timer);
619 } else {
620 cmd->time_left = 0;
621 pmcraid_info("BIST is complete, proceeding with reset\n");
622 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
623 pmcraid_ioa_reset(cmd);
624 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
625 }
626}
627
628/**
629 * pmcraid_start_bist - starts BIST
630 * @cmd: pointer to reset cmd
631 * Return Value
632 * none
633 */
634static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
635{
636 struct pmcraid_instance *pinstance = cmd->drv_inst;
637 u32 doorbells, intrs;
638
639 /* proceed with bist and wait for 2 seconds */
640 iowrite32(DOORBELL_IOA_START_BIST,
641 pinstance->int_regs.host_ioa_interrupt_reg);
642 doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
643 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
644 pmcraid_info("doorbells after start bist: %x intrs: %x\n",
645 doorbells, intrs);
646
647 cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
648 cmd->timer.data = (unsigned long)cmd;
649 cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
650 cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
651 add_timer(&cmd->timer);
652}
653
654/**
655 * pmcraid_reset_alert_done - completion routine for reset_alert
656 * @cmd: pointer to command block used in reset sequence
657 * Return value
658 * None
659 */
660static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
661{
662 struct pmcraid_instance *pinstance = cmd->drv_inst;
663 u32 status = ioread32(pinstance->ioa_status);
664 unsigned long lock_flags;
665
666 /* if the critical operation in progress bit is set or the wait times
667 * out, invoke reset engine to proceed with hard reset. If there is
668 * some more time to wait, restart the timer
669 */
670 if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
671 cmd->time_left <= 0) {
672 pmcraid_info("critical op is reset proceeding with reset\n");
673 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
674 pmcraid_ioa_reset(cmd);
675 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
676 } else {
677 pmcraid_info("critical op is not yet reset waiting again\n");
678 /* restart timer if some more time is available to wait */
679 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
680 cmd->timer.data = (unsigned long)cmd;
681 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
682 cmd->timer.function =
683 (void (*)(unsigned long))pmcraid_reset_alert_done;
684 add_timer(&cmd->timer);
685 }
686}
687
688/**
689 * pmcraid_reset_alert - alerts IOA for a possible reset
690 * @cmd : command block to be used for reset sequence.
691 *
692 * Return Value
693 * returns 0 if pci config-space is accessible and RESET_DOORBELL is
694 * successfully written to IOA. Returns non-zero in case pci_config_space
695 * is not accessible
696 */
697static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
698static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
699{
700 struct pmcraid_instance *pinstance = cmd->drv_inst;
701 u32 doorbells;
702 int rc;
703 u16 pci_reg;
704
705 /* If we are able to access IOA PCI config space, alert IOA that we are
706 * going to reset it soon. This enables IOA to preserv persistent error
707 * data if any. In case memory space is not accessible, proceed with
708 * BIST or slot_reset
709 */
710 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
711 if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
712
713 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
714 * reset IOA doesn't generate any interrupts when CRITICAL
715 * OPERATION bit is reset. A timer is started to wait for this
716 * bit to be reset.
717 */
718 cmd->time_left = PMCRAID_RESET_TIMEOUT;
719 cmd->timer.data = (unsigned long)cmd;
720 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
721 cmd->timer.function =
722 (void (*)(unsigned long))pmcraid_reset_alert_done;
723 add_timer(&cmd->timer);
724
725 iowrite32(DOORBELL_IOA_RESET_ALERT,
726 pinstance->int_regs.host_ioa_interrupt_reg);
727 doorbells =
728 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
729 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
730 } else {
731 pmcraid_info("PCI config is not accessible starting BIST\n");
732 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
733 pmcraid_start_bist(cmd);
734 }
735}
736
737/**
738 * pmcraid_timeout_handler - Timeout handler for internally generated ops
739 *
740 * @cmd : pointer to command structure, that got timedout
741 *
742 * This function blocks host requests and initiates an adapter reset.
743 *
744 * Return value:
745 * None
746 */
747static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
748{
749 struct pmcraid_instance *pinstance = cmd->drv_inst;
750 unsigned long lock_flags;
751
752 dev_info(&pinstance->pdev->dev,
753 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
754 cmd->ioa_cb->ioarcb.cdb[0]);
755
756 /* Command timeouts result in hard reset sequence. The command that got
757 * timed out may be the one used as part of reset sequence. In this
758 * case restart reset sequence using the same command block even if
759 * reset is in progress. Otherwise fail this command and get a free
760 * command block to restart the reset sequence.
761 */
762 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
763 if (!pinstance->ioa_reset_in_progress) {
764 pinstance->ioa_reset_attempts = 0;
765 cmd = pmcraid_get_free_cmd(pinstance);
766
767 /* If we are out of command blocks, just return here itself.
768 * Some other command's timeout handler can do the reset job
769 */
770 if (cmd == NULL) {
771 spin_unlock_irqrestore(pinstance->host->host_lock,
772 lock_flags);
773 pmcraid_err("no free cmnd block for timeout handler\n");
774 return;
775 }
776
777 pinstance->reset_cmd = cmd;
778 pinstance->ioa_reset_in_progress = 1;
779 } else {
780 pmcraid_info("reset is already in progress\n");
781
782 if (pinstance->reset_cmd != cmd) {
783 /* This command should have been given to IOA, this
784 * command will be completed by fail_outstanding_cmds
785 * anyway
786 */
787 pmcraid_err("cmd is pending but reset in progress\n");
788 }
789
790 /* If this command was being used as part of the reset
791 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
792 * causes fail_outstanding_commands not to return the command
793 * block back to free pool
794 */
795 if (cmd == pinstance->reset_cmd)
796 cmd->cmd_done = pmcraid_ioa_reset;
797 }
798
799 /* Notify apps of important IOA bringup/bringdown sequences */
800 if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
801 pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
802 pmcraid_notify_ioastate(pinstance,
803 PMC_DEVICE_EVENT_RESET_START);
804
805 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
806 scsi_block_requests(pinstance->host);
807 pmcraid_reset_alert(cmd);
808 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
809}
810
811/**
812 * pmcraid_internal_done - completion routine for internally generated cmds
813 *
814 * @cmd: command that got response from IOA
815 *
816 * Return Value:
817 * none
818 */
819static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
820{
821 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
822 cmd->ioa_cb->ioarcb.cdb[0],
823 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
824
825 /* Some of the internal commands are sent with callers blocking for the
826 * response. Same will be indicated as part of cmd->completion_req
827 * field. Response path needs to wake up any waiters waiting for cmd
828 * completion if this flag is set.
829 */
830 if (cmd->completion_req) {
831 cmd->completion_req = 0;
832 complete(&cmd->wait_for_completion);
833 }
834
835 /* most of the internal commands are completed by caller itself, so
836 * no need to return the command block back to free pool until we are
837 * required to do so (e.g once done with initialization).
838 */
839 if (cmd->release) {
840 cmd->release = 0;
841 pmcraid_return_cmd(cmd);
842 }
843}
844
845/**
846 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
847 *
848 * @cmd: command that got response from IOA
849 *
850 * This routine is called after driver re-reads configuration table due to a
851 * lost CCN. It returns the command block back to free pool and schedules
852 * worker thread to add/delete devices into the system.
853 *
854 * Return Value:
855 * none
856 */
857static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
858{
859 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
860 cmd->ioa_cb->ioarcb.cdb[0],
861 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
862
863 if (cmd->release) {
864 cmd->release = 0;
865 pmcraid_return_cmd(cmd);
866 }
867 pmcraid_info("scheduling worker for config table reinitialization\n");
868 schedule_work(&cmd->drv_inst->worker_q);
869}
870
871/**
872 * pmcraid_erp_done - Process completion of SCSI error response from device
873 * @cmd: pmcraid_command
874 *
875 * This function copies the sense buffer into the scsi_cmd struct and completes
876 * scsi_cmd by calling scsi_done function.
877 *
878 * Return value:
879 * none
880 */
881static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
882{
883 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
884 struct pmcraid_instance *pinstance = cmd->drv_inst;
885 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
886
887 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
888 scsi_cmd->result |= (DID_ERROR << 16);
889 scmd_printk(KERN_INFO, scsi_cmd,
890 "command CDB[0] = %x failed with IOASC: 0x%08X\n",
891 cmd->ioa_cb->ioarcb.cdb[0], ioasc);
892 }
893
894 /* if we had allocated sense buffers for request sense, copy the sense
895 * release the buffers
896 */
897 if (cmd->sense_buffer != NULL) {
898 memcpy(scsi_cmd->sense_buffer,
899 cmd->sense_buffer,
900 SCSI_SENSE_BUFFERSIZE);
901 pci_free_consistent(pinstance->pdev,
902 SCSI_SENSE_BUFFERSIZE,
903 cmd->sense_buffer, cmd->sense_buffer_dma);
904 cmd->sense_buffer = NULL;
905 cmd->sense_buffer_dma = 0;
906 }
907
908 scsi_dma_unmap(scsi_cmd);
909 pmcraid_return_cmd(cmd);
910 scsi_cmd->scsi_done(scsi_cmd);
911}
912
913/**
914 * pmcraid_fire_command - sends an IOA command to adapter
915 *
916 * This function adds the given block into pending command list
917 * and returns without waiting
918 *
919 * @cmd : command to be sent to the device
920 *
921 * Return Value
922 * None
923 */
924static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
925{
926 struct pmcraid_instance *pinstance = cmd->drv_inst;
927 unsigned long lock_flags;
928
929 /* Add this command block to pending cmd pool. We do this prior to
930 * writting IOARCB to ioarrin because IOA might complete the command
931 * by the time we are about to add it to the list. Response handler
932 * (isr/tasklet) looks for cmd block in the pending pending list.
933 */
934 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
935 list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
936 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
937 atomic_inc(&pinstance->outstanding_cmds);
938
939 /* driver writes lower 32-bit value of IOARCB address only */
940 mb();
941 iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
942 pinstance->ioarrin);
943}
944
945/**
946 * pmcraid_send_cmd - fires a command to IOA
947 *
948 * This function also sets up timeout function, and command completion
949 * function
950 *
951 * @cmd: pointer to the command block to be fired to IOA
952 * @cmd_done: command completion function, called once IOA responds
953 * @timeout: timeout to wait for this command completion
954 * @timeout_func: timeout handler
955 *
956 * Return value
957 * none
958 */
959static void pmcraid_send_cmd(
960 struct pmcraid_cmd *cmd,
961 void (*cmd_done) (struct pmcraid_cmd *),
962 unsigned long timeout,
963 void (*timeout_func) (struct pmcraid_cmd *)
964)
965{
966 /* initialize done function */
967 cmd->cmd_done = cmd_done;
968
969 if (timeout_func) {
970 /* setup timeout handler */
971 cmd->timer.data = (unsigned long)cmd;
972 cmd->timer.expires = jiffies + timeout;
973 cmd->timer.function = (void (*)(unsigned long))timeout_func;
974 add_timer(&cmd->timer);
975 }
976
977 /* fire the command to IOA */
978 _pmcraid_fire_command(cmd);
979}
980
981/**
982 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
983 * @cmd: pointer to the command block used for sending IOA shutdown command
984 *
985 * Return value
986 * None
987 */
988static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
989{
990 struct pmcraid_instance *pinstance = cmd->drv_inst;
991 unsigned long lock_flags;
992
993 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
994 pmcraid_ioa_reset(cmd);
995 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
996}
997
998/**
999 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
1000 *
1001 * @cmd: pointer to the command block used as part of reset sequence
1002 *
1003 * Return Value
1004 * None
1005 */
1006static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
1007{
1008 pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
1009 cmd->ioa_cb->ioarcb.cdb[0],
1010 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1011
1012 /* Note that commands sent during reset require next command to be sent
1013 * to IOA. Hence reinit the done function as well as timeout function
1014 */
1015 pmcraid_reinit_cmdblk(cmd);
1016 cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
1017 cmd->ioa_cb->ioarcb.resource_handle =
1018 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1019 cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
1020 cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
1021
1022 /* fire shutdown command to hardware. */
1023 pmcraid_info("firing normal shutdown command (%d) to IOA\n",
1024 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
1025
1026 pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
1027
1028 pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
1029 PMCRAID_SHUTDOWN_TIMEOUT,
1030 pmcraid_timeout_handler);
1031}
1032
1033/**
1034 * pmcraid_get_fwversion_done - completion function for get_fwversion
1035 *
1036 * @cmd: pointer to command block used to send INQUIRY command
1037 *
1038 * Return Value
1039 * none
1040 */
1041static void pmcraid_querycfg(struct pmcraid_cmd *);
1042
1043static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
1044{
1045 struct pmcraid_instance *pinstance = cmd->drv_inst;
1046 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1047 unsigned long lock_flags;
1048
1049 /* configuration table entry size depends on firmware version. If fw
1050 * version is not known, it is not possible to interpret IOA config
1051 * table
1052 */
1053 if (ioasc) {
1054 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
1055 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1056 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1057 pmcraid_reset_alert(cmd);
1058 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1059 } else {
1060 pmcraid_querycfg(cmd);
1061 }
1062}
1063
1064/**
1065 * pmcraid_get_fwversion - reads firmware version information
1066 *
1067 * @cmd: pointer to command block used to send INQUIRY command
1068 *
1069 * Return Value
1070 * none
1071 */
1072static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1073{
1074 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1075 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
1076 struct pmcraid_instance *pinstance = cmd->drv_inst;
1077 u16 data_size = sizeof(struct pmcraid_inquiry_data);
1078
1079 pmcraid_reinit_cmdblk(cmd);
1080 ioarcb->request_type = REQ_TYPE_SCSI;
1081 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1082 ioarcb->cdb[0] = INQUIRY;
1083 ioarcb->cdb[1] = 1;
1084 ioarcb->cdb[2] = 0xD0;
1085 ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1086 ioarcb->cdb[4] = data_size & 0xFF;
1087
1088 /* Since entire inquiry data it can be part of IOARCB itself
1089 */
1090 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1091 offsetof(struct pmcraid_ioarcb,
1092 add_data.u.ioadl[0]));
1093 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1094 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
1095
1096 ioarcb->request_flags0 |= NO_LINK_DESCS;
1097 ioarcb->data_transfer_length = cpu_to_le32(data_size);
1098 ioadl = &(ioarcb->add_data.u.ioadl[0]);
1099 ioadl->flags = IOADL_FLAGS_LAST_DESC;
1100 ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1101 ioadl->data_len = cpu_to_le32(data_size);
1102
1103 pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1104 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1105}
1106
1107/**
1108 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1109 * @cmd: pointer to command block to be used for identify hrrq
1110 *
1111 * Return Value
1112 * none
1113 */
1114static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1115{
1116 struct pmcraid_instance *pinstance = cmd->drv_inst;
1117 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1118 int index = cmd->hrrq_index;
1119 __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1120 u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1121 void (*done_function)(struct pmcraid_cmd *);
1122
1123 pmcraid_reinit_cmdblk(cmd);
1124 cmd->hrrq_index = index + 1;
1125
1126 if (cmd->hrrq_index < pinstance->num_hrrq) {
1127 done_function = pmcraid_identify_hrrq;
1128 } else {
1129 cmd->hrrq_index = 0;
1130 done_function = pmcraid_get_fwversion;
1131 }
1132
1133 /* Initialize ioarcb */
1134 ioarcb->request_type = REQ_TYPE_IOACMD;
1135 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1136
1137 /* initialize the hrrq number where IOA will respond to this command */
1138 ioarcb->hrrq_id = index;
1139 ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1140 ioarcb->cdb[1] = index;
1141
1142 /* IOA expects 64-bit pci address to be written in B.E format
1143 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1144 */
1145 pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1146 hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1147
1148 memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1149 memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1150
1151 /* Subsequent commands require HRRQ identification to be successful.
1152 * Note that this gets called even during reset from SCSI mid-layer
1153 * or tasklet
1154 */
1155 pmcraid_send_cmd(cmd, done_function,
1156 PMCRAID_INTERNAL_TIMEOUT,
1157 pmcraid_timeout_handler);
1158}
1159
1160static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1161static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1162
1163/**
1164 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1165 *
1166 * @cmd: initialized command block pointer
1167 *
1168 * Return Value
1169 * none
1170 */
1171static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1172{
1173 if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1174 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1175 else
1176 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1177
1178 pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1179}
1180
1181/**
1182 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1183 *
1184 * @pinstance: pointer to adapter instance structure
1185 * @type: HCAM type
1186 *
1187 * Return Value
1188 * pointer to initialized pmcraid_cmd structure or NULL
1189 */
1190static struct pmcraid_cmd *pmcraid_init_hcam
1191(
1192 struct pmcraid_instance *pinstance,
1193 u8 type
1194)
1195{
1196 struct pmcraid_cmd *cmd;
1197 struct pmcraid_ioarcb *ioarcb;
1198 struct pmcraid_ioadl_desc *ioadl;
1199 struct pmcraid_hostrcb *hcam;
1200 void (*cmd_done) (struct pmcraid_cmd *);
1201 dma_addr_t dma;
1202 int rcb_size;
1203
1204 cmd = pmcraid_get_free_cmd(pinstance);
1205
1206 if (!cmd) {
1207 pmcraid_err("no free command blocks for hcam\n");
1208 return cmd;
1209 }
1210
1211 if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1212 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1213 cmd_done = pmcraid_process_ccn;
1214 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1215 hcam = &pinstance->ccn;
1216 } else {
1217 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1218 cmd_done = pmcraid_process_ldn;
1219 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1220 hcam = &pinstance->ldn;
1221 }
1222
1223 /* initialize command pointer used for HCAM registration */
1224 hcam->cmd = cmd;
1225
1226 ioarcb = &cmd->ioa_cb->ioarcb;
1227 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1228 offsetof(struct pmcraid_ioarcb,
1229 add_data.u.ioadl[0]));
1230 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1231 ioadl = ioarcb->add_data.u.ioadl;
1232
1233 /* Initialize ioarcb */
1234 ioarcb->request_type = REQ_TYPE_HCAM;
1235 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1236 ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1237 ioarcb->cdb[1] = type;
1238 ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1239 ioarcb->cdb[8] = (rcb_size) & 0xFF;
1240
1241 ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1242
1243 ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1244 ioadl[0].data_len = cpu_to_le32(rcb_size);
1245 ioadl[0].address = cpu_to_le32(dma);
1246
1247 cmd->cmd_done = cmd_done;
1248 return cmd;
1249}
1250
1251/**
1252 * pmcraid_send_hcam - Send an HCAM to IOA
1253 * @pinstance: ioa config struct
1254 * @type: HCAM type
1255 *
1256 * This function will send a Host Controlled Async command to IOA.
1257 *
1258 * Return value:
1259 * none
1260 */
1261static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1262{
1263 struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1264 pmcraid_send_hcam_cmd(cmd);
1265}
1266
1267
1268/**
1269 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1270 *
1271 * @cmd: pointer to cmd that is used as cancelling command
1272 * @cmd_to_cancel: pointer to the command that needs to be cancelled
1273 */
1274static void pmcraid_prepare_cancel_cmd(
1275 struct pmcraid_cmd *cmd,
1276 struct pmcraid_cmd *cmd_to_cancel
1277)
1278{
1279 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1280 __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
1281
1282 /* Get the resource handle to where the command to be aborted has been
1283 * sent.
1284 */
1285 ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1286 ioarcb->request_type = REQ_TYPE_IOACMD;
1287 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1288 ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1289
1290 /* IOARCB address of the command to be cancelled is given in
1291 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1292 * IOARCB address are not masked.
1293 */
1294 ioarcb_addr = cpu_to_be64(ioarcb_addr);
1295 memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1296}
1297
1298/**
1299 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1300 *
1301 * @cmd: command to be used as cancelling command
1302 * @type: HCAM type
1303 * @cmd_done: op done function for the cancelling command
1304 */
1305static void pmcraid_cancel_hcam(
1306 struct pmcraid_cmd *cmd,
1307 u8 type,
1308 void (*cmd_done) (struct pmcraid_cmd *)
1309)
1310{
1311 struct pmcraid_instance *pinstance;
1312 struct pmcraid_hostrcb *hcam;
1313
1314 pinstance = cmd->drv_inst;
1315 hcam = (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1316 &pinstance->ldn : &pinstance->ccn;
1317
1318 /* prepare for cancelling previous hcam command. If the HCAM is
1319 * currently not pending with IOA, we would have hcam->cmd as non-null
1320 */
1321 if (hcam->cmd == NULL)
1322 return;
1323
1324 pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1325
1326 /* writing to IOARRIN must be protected by host_lock, as mid-layer
1327 * schedule queuecommand while we are doing this
1328 */
1329 pmcraid_send_cmd(cmd, cmd_done,
1330 PMCRAID_INTERNAL_TIMEOUT,
1331 pmcraid_timeout_handler);
1332}
1333
1334/**
1335 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1336 *
1337 * @cmd: command block to be used for cancelling the HCAM
1338 */
1339static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1340{
1341 pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1342 cmd->ioa_cb->ioarcb.cdb[0],
1343 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1344
1345 pmcraid_reinit_cmdblk(cmd);
1346
1347 pmcraid_cancel_hcam(cmd,
1348 PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1349 pmcraid_ioa_shutdown);
1350}
1351
1352/**
1353 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1354 *
1355 * @cmd: command block to be used for cancelling the HCAM
1356 */
1357static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1358{
1359 pmcraid_cancel_hcam(cmd,
1360 PMCRAID_HCAM_CODE_LOG_DATA,
1361 pmcraid_cancel_ccn);
1362}
1363
1364/**
1365 * pmcraid_expose_resource - check if the resource can be exposed to OS
1366 *
1367 * @fw_version: firmware version code
1368 * @cfgte: pointer to configuration table entry of the resource
1369 *
1370 * Return value:
1371 * true if resource can be added to midlayer, false(0) otherwise
1372 */
1373static int pmcraid_expose_resource(u16 fw_version,
1374 struct pmcraid_config_table_entry *cfgte)
1375{
1376 int retval = 0;
1377
1378 if (cfgte->resource_type == RES_TYPE_VSET) {
1379 if (fw_version <= PMCRAID_FW_VERSION_1)
1380 retval = ((cfgte->unique_flags1 & 0x80) == 0);
1381 else
1382 retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1383 (cfgte->unique_flags1 & 0x80) == 0);
1384
1385 } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1386 retval = (RES_BUS(cfgte->resource_address) !=
1387 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1388 return retval;
1389}
1390
1391/* attributes supported by pmcraid_event_family */
1392enum {
1393 PMCRAID_AEN_ATTR_UNSPEC,
1394 PMCRAID_AEN_ATTR_EVENT,
1395 __PMCRAID_AEN_ATTR_MAX,
1396};
1397#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1398
1399/* commands supported by pmcraid_event_family */
1400enum {
1401 PMCRAID_AEN_CMD_UNSPEC,
1402 PMCRAID_AEN_CMD_EVENT,
1403 __PMCRAID_AEN_CMD_MAX,
1404};
1405#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1406
1407static struct genl_family pmcraid_event_family = {
1408 .id = GENL_ID_GENERATE,
1409 .name = "pmcraid",
1410 .version = 1,
1411 .maxattr = PMCRAID_AEN_ATTR_MAX
1412};
1413
1414/**
1415 * pmcraid_netlink_init - registers pmcraid_event_family
1416 *
1417 * Return value:
1418 * 0 if the pmcraid_event_family is successfully registered
1419 * with netlink generic, non-zero otherwise
1420 */
1421static int pmcraid_netlink_init(void)
1422{
1423 int result;
1424
1425 result = genl_register_family(&pmcraid_event_family);
1426
1427 if (result)
1428 return result;
1429
1430 pmcraid_info("registered NETLINK GENERIC group: %d\n",
1431 pmcraid_event_family.id);
1432
1433 return result;
1434}
1435
1436/**
1437 * pmcraid_netlink_release - unregisters pmcraid_event_family
1438 *
1439 * Return value:
1440 * none
1441 */
1442static void pmcraid_netlink_release(void)
1443{
1444 genl_unregister_family(&pmcraid_event_family);
1445}
1446
1447/**
1448 * pmcraid_notify_aen - sends event msg to user space application
1449 * @pinstance: pointer to adapter instance structure
1450 * @type: HCAM type
1451 *
1452 * Return value:
1453 * 0 if success, error value in case of any failure.
1454 */
1455static int pmcraid_notify_aen(
1456 struct pmcraid_instance *pinstance,
1457 struct pmcraid_aen_msg *aen_msg,
1458 u32 data_size
1459)
1460{
1461 struct sk_buff *skb;
1462 void *msg_header;
1463 u32 total_size, nla_genl_hdr_total_size;
1464 int result;
1465
1466 aen_msg->hostno = (pinstance->host->unique_id << 16 |
1467 MINOR(pinstance->cdev.dev));
1468 aen_msg->length = data_size;
1469
1470 data_size += sizeof(*aen_msg);
1471
1472 total_size = nla_total_size(data_size);
1473 /* Add GENL_HDR to total_size */
1474 nla_genl_hdr_total_size =
1475 (total_size + (GENL_HDRLEN +
1476 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1477 + NLMSG_HDRLEN);
1478 skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1479
1480
1481 if (!skb) {
1482 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1483 total_size);
1484 return -ENOMEM;
1485 }
1486
1487 /* add the genetlink message header */
1488 msg_header = genlmsg_put(skb, 0, 0,
1489 &pmcraid_event_family, 0,
1490 PMCRAID_AEN_CMD_EVENT);
1491 if (!msg_header) {
1492 pmcraid_err("failed to copy command details\n");
1493 nlmsg_free(skb);
1494 return -ENOMEM;
1495 }
1496
1497 result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1498
1499 if (result) {
1500 pmcraid_err("failed to copy AEN attribute data\n");
1501 nlmsg_free(skb);
1502 return -EINVAL;
1503 }
1504
1505 /* send genetlink multicast message to notify appplications */
1506 result = genlmsg_end(skb, msg_header);
1507
1508 if (result < 0) {
1509 pmcraid_err("genlmsg_end failed\n");
1510 nlmsg_free(skb);
1511 return result;
1512 }
1513
1514 result =
1515 genlmsg_multicast(skb, 0, pmcraid_event_family.id, GFP_ATOMIC);
1516
1517 /* If there are no listeners, genlmsg_multicast may return non-zero
1518 * value.
1519 */
1520 if (result)
1521 pmcraid_info("error (%x) sending aen event message\n", result);
1522 return result;
1523}
1524
1525/**
1526 * pmcraid_notify_ccn - notifies about CCN event msg to user space
1527 * @pinstance: pointer adapter instance structure
1528 *
1529 * Return value:
1530 * 0 if success, error value in case of any failure
1531 */
1532static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1533{
1534 return pmcraid_notify_aen(pinstance,
1535 pinstance->ccn.msg,
1536 pinstance->ccn.hcam->data_len +
1537 sizeof(struct pmcraid_hcam_hdr));
1538}
1539
1540/**
1541 * pmcraid_notify_ldn - notifies about CCN event msg to user space
1542 * @pinstance: pointer adapter instance structure
1543 *
1544 * Return value:
1545 * 0 if success, error value in case of any failure
1546 */
1547static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1548{
1549 return pmcraid_notify_aen(pinstance,
1550 pinstance->ldn.msg,
1551 pinstance->ldn.hcam->data_len +
1552 sizeof(struct pmcraid_hcam_hdr));
1553}
1554
1555/**
1556 * pmcraid_notify_ioastate - sends IOA state event msg to user space
1557 * @pinstance: pointer adapter instance structure
1558 * @evt: controller state event to be sent
1559 *
1560 * Return value:
1561 * 0 if success, error value in case of any failure
1562 */
1563static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1564{
1565 pinstance->scn.ioa_state = evt;
1566 pmcraid_notify_aen(pinstance,
1567 &pinstance->scn.msg,
1568 sizeof(u32));
1569}
1570
1571/**
1572 * pmcraid_handle_config_change - Handle a config change from the adapter
1573 * @pinstance: pointer to per adapter instance structure
1574 *
1575 * Return value:
1576 * none
1577 */
1578
1579static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1580{
1581 struct pmcraid_config_table_entry *cfg_entry;
1582 struct pmcraid_hcam_ccn *ccn_hcam;
1583 struct pmcraid_cmd *cmd;
1584 struct pmcraid_cmd *cfgcmd;
1585 struct pmcraid_resource_entry *res = NULL;
1586 unsigned long lock_flags;
1587 unsigned long host_lock_flags;
1588 u32 new_entry = 1;
1589 u32 hidden_entry = 0;
1590 u16 fw_version;
1591 int rc;
1592
1593 ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1594 cfg_entry = &ccn_hcam->cfg_entry;
1595 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1596
1597 pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1598 res: %x:%x:%x:%x\n",
1599 pinstance->ccn.hcam->ilid,
1600 pinstance->ccn.hcam->op_code,
1601 ((pinstance->ccn.hcam->timestamp1) |
1602 ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
1603 pinstance->ccn.hcam->notification_type,
1604 pinstance->ccn.hcam->notification_lost,
1605 pinstance->ccn.hcam->flags,
1606 pinstance->host->unique_id,
1607 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1608 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1609 RES_BUS(cfg_entry->resource_address)),
1610 RES_IS_VSET(*cfg_entry) ?
1611 (fw_version <= PMCRAID_FW_VERSION_1 ?
1612 cfg_entry->unique_flags1 :
1613 cfg_entry->array_id & 0xFF) :
1614 RES_TARGET(cfg_entry->resource_address),
1615 RES_LUN(cfg_entry->resource_address));
1616
1617
1618 /* If this HCAM indicates a lost notification, read the config table */
1619 if (pinstance->ccn.hcam->notification_lost) {
1620 cfgcmd = pmcraid_get_free_cmd(pinstance);
1621 if (cfgcmd) {
1622 pmcraid_info("lost CCN, reading config table\b");
1623 pinstance->reinit_cfg_table = 1;
1624 pmcraid_querycfg(cfgcmd);
1625 } else {
1626 pmcraid_err("lost CCN, no free cmd for querycfg\n");
1627 }
1628 goto out_notify_apps;
1629 }
1630
1631 /* If this resource is not going to be added to mid-layer, just notify
1632 * applications and return. If this notification is about hiding a VSET
1633 * resource, check if it was exposed already.
1634 */
1635 if (pinstance->ccn.hcam->notification_type ==
1636 NOTIFICATION_TYPE_ENTRY_CHANGED &&
1637 cfg_entry->resource_type == RES_TYPE_VSET) {
1638
1639 if (fw_version <= PMCRAID_FW_VERSION_1)
1640 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1641 else
1642 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1643
1644 } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1645 goto out_notify_apps;
1646 }
1647
1648 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1649 list_for_each_entry(res, &pinstance->used_res_q, queue) {
1650 rc = memcmp(&res->cfg_entry.resource_address,
1651 &cfg_entry->resource_address,
1652 sizeof(cfg_entry->resource_address));
1653 if (!rc) {
1654 new_entry = 0;
1655 break;
1656 }
1657 }
1658
1659 if (new_entry) {
1660
1661 if (hidden_entry) {
1662 spin_unlock_irqrestore(&pinstance->resource_lock,
1663 lock_flags);
1664 goto out_notify_apps;
1665 }
1666
1667 /* If there are more number of resources than what driver can
1668 * manage, do not notify the applications about the CCN. Just
1669 * ignore this notifications and re-register the same HCAM
1670 */
1671 if (list_empty(&pinstance->free_res_q)) {
1672 spin_unlock_irqrestore(&pinstance->resource_lock,
1673 lock_flags);
1674 pmcraid_err("too many resources attached\n");
1675 spin_lock_irqsave(pinstance->host->host_lock,
1676 host_lock_flags);
1677 pmcraid_send_hcam(pinstance,
1678 PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1679 spin_unlock_irqrestore(pinstance->host->host_lock,
1680 host_lock_flags);
1681 return;
1682 }
1683
1684 res = list_entry(pinstance->free_res_q.next,
1685 struct pmcraid_resource_entry, queue);
1686
1687 list_del(&res->queue);
1688 res->scsi_dev = NULL;
1689 res->reset_progress = 0;
1690 list_add_tail(&res->queue, &pinstance->used_res_q);
1691 }
1692
1693 memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1694
1695 if (pinstance->ccn.hcam->notification_type ==
1696 NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1697 if (res->scsi_dev) {
1698 if (fw_version <= PMCRAID_FW_VERSION_1)
1699 res->cfg_entry.unique_flags1 &= 0x7F;
1700 else
1701 res->cfg_entry.array_id &= 0xFF;
1702 res->change_detected = RES_CHANGE_DEL;
1703 res->cfg_entry.resource_handle =
1704 PMCRAID_INVALID_RES_HANDLE;
1705 schedule_work(&pinstance->worker_q);
1706 } else {
1707 /* This may be one of the non-exposed resources */
1708 list_move_tail(&res->queue, &pinstance->free_res_q);
1709 }
1710 } else if (!res->scsi_dev) {
1711 res->change_detected = RES_CHANGE_ADD;
1712 schedule_work(&pinstance->worker_q);
1713 }
1714 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1715
1716out_notify_apps:
1717
1718 /* Notify configuration changes to registered applications.*/
1719 if (!pmcraid_disable_aen)
1720 pmcraid_notify_ccn(pinstance);
1721
1722 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1723 if (cmd)
1724 pmcraid_send_hcam_cmd(cmd);
1725}
1726
1727/**
1728 * pmcraid_get_error_info - return error string for an ioasc
1729 * @ioasc: ioasc code
1730 * Return Value
1731 * none
1732 */
1733static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1734{
1735 int i;
1736 for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1737 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1738 return &pmcraid_ioasc_error_table[i];
1739 }
1740 return NULL;
1741}
1742
1743/**
1744 * pmcraid_ioasc_logger - log IOASC information based user-settings
1745 * @ioasc: ioasc code
1746 * @cmd: pointer to command that resulted in 'ioasc'
1747 */
1748void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1749{
1750 struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1751
1752 if (error_info == NULL ||
1753 cmd->drv_inst->current_log_level < error_info->log_level)
1754 return;
1755
1756 /* log the error string */
1757 pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1758 cmd->ioa_cb->ioarcb.cdb[0],
1759 cmd->ioa_cb->ioarcb.resource_handle,
1760 le32_to_cpu(ioasc), error_info->error_string);
1761}
1762
1763/**
1764 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1765 *
1766 * @pinstance: pointer to per adapter instance structure
1767 *
1768 * Return value:
1769 * none
1770 */
1771static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1772{
1773 struct pmcraid_hcam_ldn *hcam_ldn;
1774 u32 ioasc;
1775
1776 hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1777
1778 pmcraid_info
1779 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1780 pinstance->ldn.hcam->ilid,
1781 pinstance->ldn.hcam->op_code,
1782 pinstance->ldn.hcam->notification_type,
1783 pinstance->ldn.hcam->notification_lost,
1784 pinstance->ldn.hcam->flags,
1785 pinstance->ldn.hcam->overlay_id);
1786
1787 /* log only the errors, no need to log informational log entries */
1788 if (pinstance->ldn.hcam->notification_type !=
1789 NOTIFICATION_TYPE_ERROR_LOG)
1790 return;
1791
1792 if (pinstance->ldn.hcam->notification_lost ==
1793 HOSTRCB_NOTIFICATIONS_LOST)
1794 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1795
1796 ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1797
1798 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1799 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1800 dev_info(&pinstance->pdev->dev,
1801 "UnitAttention due to IOA Bus Reset\n");
1802 scsi_report_bus_reset(
1803 pinstance->host,
1804 RES_BUS(hcam_ldn->error_log.fd_ra));
1805 }
1806
1807 return;
1808}
1809
1810/**
1811 * pmcraid_process_ccn - Op done function for a CCN.
1812 * @cmd: pointer to command struct
1813 *
1814 * This function is the op done function for a configuration
1815 * change notification
1816 *
1817 * Return value:
1818 * none
1819 */
1820static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1821{
1822 struct pmcraid_instance *pinstance = cmd->drv_inst;
1823 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1824 unsigned long lock_flags;
1825
1826 pinstance->ccn.cmd = NULL;
1827 pmcraid_return_cmd(cmd);
1828
1829 /* If driver initiated IOA reset happened while this hcam was pending
1830 * with IOA, or IOA bringdown sequence is in progress, no need to
1831 * re-register the hcam
1832 */
1833 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1834 atomic_read(&pinstance->ccn.ignore) == 1) {
1835 return;
1836 } else if (ioasc) {
1837 dev_info(&pinstance->pdev->dev,
1838 "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1839 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1840 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1841 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1842 } else {
1843 pmcraid_handle_config_change(pinstance);
1844 }
1845}
1846
1847/**
1848 * pmcraid_process_ldn - op done function for an LDN
1849 * @cmd: pointer to command block
1850 *
1851 * Return value
1852 * none
1853 */
1854static void pmcraid_initiate_reset(struct pmcraid_instance *);
1855static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1856
1857static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1858{
1859 struct pmcraid_instance *pinstance = cmd->drv_inst;
1860 struct pmcraid_hcam_ldn *ldn_hcam =
1861 (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1862 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1863 u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1864 unsigned long lock_flags;
1865
1866 /* return the command block back to freepool */
1867 pinstance->ldn.cmd = NULL;
1868 pmcraid_return_cmd(cmd);
1869
1870 /* If driver initiated IOA reset happened while this hcam was pending
1871 * with IOA, no need to re-register the hcam as reset engine will do it
1872 * once reset sequence is complete
1873 */
1874 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1875 atomic_read(&pinstance->ccn.ignore) == 1) {
1876 return;
1877 } else if (!ioasc) {
1878 pmcraid_handle_error_log(pinstance);
1879 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1880 spin_lock_irqsave(pinstance->host->host_lock,
1881 lock_flags);
1882 pmcraid_initiate_reset(pinstance);
1883 spin_unlock_irqrestore(pinstance->host->host_lock,
1884 lock_flags);
1885 return;
1886 }
1887 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1888 pinstance->timestamp_error = 1;
1889 pmcraid_set_timestamp(cmd);
1890 }
1891 } else {
1892 dev_info(&pinstance->pdev->dev,
1893 "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1894 }
1895 /* send netlink message for HCAM notification if enabled */
1896 if (!pmcraid_disable_aen)
1897 pmcraid_notify_ldn(pinstance);
1898
1899 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1900 if (cmd)
1901 pmcraid_send_hcam_cmd(cmd);
1902}
1903
1904/**
1905 * pmcraid_register_hcams - register HCAMs for CCN and LDN
1906 *
1907 * @pinstance: pointer per adapter instance structure
1908 *
1909 * Return Value
1910 * none
1911 */
1912static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1913{
1914 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1915 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1916}
1917
1918/**
1919 * pmcraid_unregister_hcams - cancel HCAMs registered already
1920 * @cmd: pointer to command used as part of reset sequence
1921 */
1922static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1923{
1924 struct pmcraid_instance *pinstance = cmd->drv_inst;
1925
1926 /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1927 * handling hcam response though it is not necessary. In order to
1928 * prevent this, set 'ignore', so that bring-down sequence doesn't
1929 * re-send any more hcams
1930 */
1931 atomic_set(&pinstance->ccn.ignore, 1);
1932 atomic_set(&pinstance->ldn.ignore, 1);
1933
1934 /* If adapter reset was forced as part of runtime reset sequence,
1935 * start the reset sequence. Reset will be triggered even in case
1936 * IOA unit_check.
1937 */
1938 if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1939 pinstance->ioa_unit_check) {
1940 pinstance->force_ioa_reset = 0;
1941 pinstance->ioa_unit_check = 0;
1942 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1943 pmcraid_reset_alert(cmd);
1944 return;
1945 }
1946
1947 /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1948 * one after the other. So CCN cancellation will be triggered by
1949 * pmcraid_cancel_ldn itself.
1950 */
1951 pmcraid_cancel_ldn(cmd);
1952}
1953
1954/**
1955 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1956 * @pinstance: pointer to adapter instance structure
1957 * Return Value
1958 * 1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1959 */
1960static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1961
1962static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1963{
1964 u32 intrs;
1965
1966 pmcraid_reinit_buffers(pinstance);
1967 intrs = pmcraid_read_interrupts(pinstance);
1968
1969 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1970
1971 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1972 if (!pinstance->interrupt_mode) {
1973 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1974 pinstance->int_regs.
1975 ioa_host_interrupt_mask_reg);
1976 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1977 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1978 }
1979 return 1;
1980 } else {
1981 return 0;
1982 }
1983}
1984
1985/**
1986 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1987 * @cmd : pointer to reset command block
1988 *
1989 * Return Value
1990 * none
1991 */
1992static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1993{
1994 struct pmcraid_instance *pinstance = cmd->drv_inst;
1995 u32 int_reg;
1996 u32 doorbell;
1997
1998 /* There will be an interrupt when Transition to Operational bit is
1999 * set so tasklet would execute next reset task. The timeout handler
2000 * would re-initiate a reset
2001 */
2002 cmd->cmd_done = pmcraid_ioa_reset;
2003 cmd->timer.data = (unsigned long)cmd;
2004 cmd->timer.expires = jiffies +
2005 msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
2006 cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
2007
2008 if (!timer_pending(&cmd->timer))
2009 add_timer(&cmd->timer);
2010
2011 /* Enable destructive diagnostics on IOA if it is not yet in
2012 * operational state
2013 */
2014 doorbell = DOORBELL_RUNTIME_RESET |
2015 DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
2016
2017 /* Since we do RESET_ALERT and Start BIST we have to again write
2018 * MSIX Doorbell to indicate the interrupt mode
2019 */
2020 if (pinstance->interrupt_mode) {
2021 iowrite32(DOORBELL_INTR_MODE_MSIX,
2022 pinstance->int_regs.host_ioa_interrupt_reg);
2023 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
2024 }
2025
2026 iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
2027 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2028 int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
2029
2030 pmcraid_info("Waiting for IOA to become operational %x:%x\n",
2031 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2032 int_reg);
2033}
2034
2035/**
2036 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
2037 *
2038 * @pinstance: pointer to adapter instance structure
2039 *
2040 * Return Value
2041 * none
2042 */
2043static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
2044{
2045 pmcraid_info("%s is not yet implemented\n", __func__);
2046}
2047
2048/**
2049 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
2050 * @pinstance: pointer to adapter instance structure
2051 *
2052 * This function fails all outstanding ops. If they are submitted to IOA
2053 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
2054 * otherwise just completes the commands and returns the cmd blocks to free
2055 * pool.
2056 *
2057 * Return value:
2058 * none
2059 */
2060static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
2061{
2062 struct pmcraid_cmd *cmd, *temp;
2063 unsigned long lock_flags;
2064
2065 /* pending command list is protected by pending_pool_lock. Its
2066 * traversal must be done as within this lock
2067 */
2068 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2069 list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
2070 free_list) {
2071 list_del(&cmd->free_list);
2072 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2073 lock_flags);
2074 cmd->ioa_cb->ioasa.ioasc =
2075 cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
2076 cmd->ioa_cb->ioasa.ilid =
2077 cpu_to_be32(PMCRAID_DRIVER_ILID);
2078
2079 /* In case the command timer is still running */
2080 del_timer(&cmd->timer);
2081
2082 /* If this is an IO command, complete it by invoking scsi_done
2083 * function. If this is one of the internal commands other
2084 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2085 * complete it
2086 */
2087 if (cmd->scsi_cmd) {
2088
2089 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2090 __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2091
2092 scsi_cmd->result |= DID_ERROR << 16;
2093
2094 scsi_dma_unmap(scsi_cmd);
2095 pmcraid_return_cmd(cmd);
2096
2097 pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2098 le32_to_cpu(resp) >> 2,
2099 cmd->ioa_cb->ioarcb.cdb[0],
2100 scsi_cmd->result);
2101 scsi_cmd->scsi_done(scsi_cmd);
2102 } else if (cmd->cmd_done == pmcraid_internal_done ||
2103 cmd->cmd_done == pmcraid_erp_done) {
2104 cmd->cmd_done(cmd);
2105 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2106 cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2107 pmcraid_return_cmd(cmd);
2108 }
2109
2110 atomic_dec(&pinstance->outstanding_cmds);
2111 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2112 }
2113
2114 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2115}
2116
2117/**
2118 * pmcraid_ioa_reset - Implementation of IOA reset logic
2119 *
2120 * @cmd: pointer to the cmd block to be used for entire reset process
2121 *
2122 * This function executes most of the steps required for IOA reset. This gets
2123 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2124 * 'eh_' thread. Access to variables used for controlling the reset sequence is
2125 * synchronized using host lock. Various functions called during reset process
2126 * would make use of a single command block, pointer to which is also stored in
2127 * adapter instance structure.
2128 *
2129 * Return Value
2130 * None
2131 */
2132static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2133{
2134 struct pmcraid_instance *pinstance = cmd->drv_inst;
2135 u8 reset_complete = 0;
2136
2137 pinstance->ioa_reset_in_progress = 1;
2138
2139 if (pinstance->reset_cmd != cmd) {
2140 pmcraid_err("reset is called with different command block\n");
2141 pinstance->reset_cmd = cmd;
2142 }
2143
2144 pmcraid_info("reset_engine: state = %d, command = %p\n",
2145 pinstance->ioa_state, cmd);
2146
2147 switch (pinstance->ioa_state) {
2148
2149 case IOA_STATE_DEAD:
2150 /* If IOA is offline, whatever may be the reset reason, just
2151 * return. callers might be waiting on the reset wait_q, wake
2152 * up them
2153 */
2154 pmcraid_err("IOA is offline no reset is possible\n");
2155 reset_complete = 1;
2156 break;
2157
2158 case IOA_STATE_IN_BRINGDOWN:
2159 /* we enter here, once ioa shutdown command is processed by IOA
2160 * Alert IOA for a possible reset. If reset alert fails, IOA
2161 * goes through hard-reset
2162 */
2163 pmcraid_disable_interrupts(pinstance, ~0);
2164 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2165 pmcraid_reset_alert(cmd);
2166 break;
2167
2168 case IOA_STATE_UNKNOWN:
2169 /* We may be called during probe or resume. Some pre-processing
2170 * is required for prior to reset
2171 */
2172 scsi_block_requests(pinstance->host);
2173
2174 /* If asked to reset while IOA was processing responses or
2175 * there are any error responses then IOA may require
2176 * hard-reset.
2177 */
2178 if (pinstance->ioa_hard_reset == 0) {
2179 if (ioread32(pinstance->ioa_status) &
2180 INTRS_TRANSITION_TO_OPERATIONAL) {
2181 pmcraid_info("sticky bit set, bring-up\n");
2182 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2183 pmcraid_reinit_cmdblk(cmd);
2184 pmcraid_identify_hrrq(cmd);
2185 } else {
2186 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2187 pmcraid_soft_reset(cmd);
2188 }
2189 } else {
2190 /* Alert IOA of a possible reset and wait for critical
2191 * operation in progress bit to reset
2192 */
2193 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2194 pmcraid_reset_alert(cmd);
2195 }
2196 break;
2197
2198 case IOA_STATE_IN_RESET_ALERT:
2199 /* If critical operation in progress bit is reset or wait gets
2200 * timed out, reset proceeds with starting BIST on the IOA.
2201 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2202 * they are 3 or more, reset engine marks IOA dead and returns
2203 */
2204 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2205 pmcraid_start_bist(cmd);
2206 break;
2207
2208 case IOA_STATE_IN_HARD_RESET:
2209 pinstance->ioa_reset_attempts++;
2210
2211 /* retry reset if we haven't reached maximum allowed limit */
2212 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2213 pinstance->ioa_reset_attempts = 0;
2214 pmcraid_err("IOA didn't respond marking it as dead\n");
2215 pinstance->ioa_state = IOA_STATE_DEAD;
2216
2217 if (pinstance->ioa_bringdown)
2218 pmcraid_notify_ioastate(pinstance,
2219 PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2220 else
2221 pmcraid_notify_ioastate(pinstance,
2222 PMC_DEVICE_EVENT_RESET_FAILED);
2223 reset_complete = 1;
2224 break;
2225 }
2226
2227 /* Once either bist or pci reset is done, restore PCI config
2228 * space. If this fails, proceed with hard reset again
2229 */
2230 pci_restore_state(pinstance->pdev);
2231
2232 /* fail all pending commands */
2233 pmcraid_fail_outstanding_cmds(pinstance);
2234
2235 /* check if unit check is active, if so extract dump */
2236 if (pinstance->ioa_unit_check) {
2237 pmcraid_info("unit check is active\n");
2238 pinstance->ioa_unit_check = 0;
2239 pmcraid_get_dump(pinstance);
2240 pinstance->ioa_reset_attempts--;
2241 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2242 pmcraid_reset_alert(cmd);
2243 break;
2244 }
2245
2246 /* if the reset reason is to bring-down the ioa, we might be
2247 * done with the reset restore pci_config_space and complete
2248 * the reset
2249 */
2250 if (pinstance->ioa_bringdown) {
2251 pmcraid_info("bringing down the adapter\n");
2252 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2253 pinstance->ioa_bringdown = 0;
2254 pinstance->ioa_state = IOA_STATE_UNKNOWN;
2255 pmcraid_notify_ioastate(pinstance,
2256 PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2257 reset_complete = 1;
2258 } else {
2259 /* bring-up IOA, so proceed with soft reset
2260 * Reinitialize hrrq_buffers and their indices also
2261 * enable interrupts after a pci_restore_state
2262 */
2263 if (pmcraid_reset_enable_ioa(pinstance)) {
2264 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2265 pmcraid_info("bringing up the adapter\n");
2266 pmcraid_reinit_cmdblk(cmd);
2267 pmcraid_identify_hrrq(cmd);
2268 } else {
2269 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2270 pmcraid_soft_reset(cmd);
2271 }
2272 }
2273 break;
2274
2275 case IOA_STATE_IN_SOFT_RESET:
2276 /* TRANSITION TO OPERATIONAL is on so start initialization
2277 * sequence
2278 */
2279 pmcraid_info("In softreset proceeding with bring-up\n");
2280 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2281
2282 /* Initialization commands start with HRRQ identification. From
2283 * now on tasklet completes most of the commands as IOA is up
2284 * and intrs are enabled
2285 */
2286 pmcraid_identify_hrrq(cmd);
2287 break;
2288
2289 case IOA_STATE_IN_BRINGUP:
2290 /* we are done with bringing up of IOA, change the ioa_state to
2291 * operational and wake up any waiters
2292 */
2293 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2294 reset_complete = 1;
2295 break;
2296
2297 case IOA_STATE_OPERATIONAL:
2298 default:
2299 /* When IOA is operational and a reset is requested, check for
2300 * the reset reason. If reset is to bring down IOA, unregister
2301 * HCAMs and initiate shutdown; if adapter reset is forced then
2302 * restart reset sequence again
2303 */
2304 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2305 pinstance->force_ioa_reset == 0) {
2306 pmcraid_notify_ioastate(pinstance,
2307 PMC_DEVICE_EVENT_RESET_SUCCESS);
2308 reset_complete = 1;
2309 } else {
2310 if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2311 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2312 pmcraid_reinit_cmdblk(cmd);
2313 pmcraid_unregister_hcams(cmd);
2314 }
2315 break;
2316 }
2317
2318 /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2319 * OPERATIONAL. Reset all control variables used during reset, wake up
2320 * any waiting threads and let the SCSI mid-layer send commands. Note
2321 * that host_lock must be held before invoking scsi_report_bus_reset.
2322 */
2323 if (reset_complete) {
2324 pinstance->ioa_reset_in_progress = 0;
2325 pinstance->ioa_reset_attempts = 0;
2326 pinstance->reset_cmd = NULL;
2327 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2328 pinstance->ioa_bringdown = 0;
2329 pmcraid_return_cmd(cmd);
2330
2331 /* If target state is to bring up the adapter, proceed with
2332 * hcam registration and resource exposure to mid-layer.
2333 */
2334 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2335 pmcraid_register_hcams(pinstance);
2336
2337 wake_up_all(&pinstance->reset_wait_q);
2338 }
2339
2340 return;
2341}
2342
2343/**
2344 * pmcraid_initiate_reset - initiates reset sequence. This is called from
2345 * ISR/tasklet during error interrupts including IOA unit check. If reset
2346 * is already in progress, it just returns, otherwise initiates IOA reset
2347 * to bring IOA up to operational state.
2348 *
2349 * @pinstance: pointer to adapter instance structure
2350 *
2351 * Return value
2352 * none
2353 */
2354static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2355{
2356 struct pmcraid_cmd *cmd;
2357
2358 /* If the reset is already in progress, just return, otherwise start
2359 * reset sequence and return
2360 */
2361 if (!pinstance->ioa_reset_in_progress) {
2362 scsi_block_requests(pinstance->host);
2363 cmd = pmcraid_get_free_cmd(pinstance);
2364
2365 if (cmd == NULL) {
2366 pmcraid_err("no cmnd blocks for initiate_reset\n");
2367 return;
2368 }
2369
2370 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2371 pinstance->reset_cmd = cmd;
2372 pinstance->force_ioa_reset = 1;
2373 pmcraid_notify_ioastate(pinstance,
2374 PMC_DEVICE_EVENT_RESET_START);
2375 pmcraid_ioa_reset(cmd);
2376 }
2377}
2378
2379/**
2380 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2381 * or bringdown IOA
2382 * @pinstance: pointer adapter instance structure
2383 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2384 * @target_state: expected target state after reset
2385 *
2386 * Note: This command initiates reset and waits for its completion. Hence this
2387 * should not be called from isr/timer/tasklet functions (timeout handlers,
2388 * error response handlers and interrupt handlers).
2389 *
2390 * Return Value
2391 * 1 in case ioa_state is not target_state, 0 otherwise.
2392 */
2393static int pmcraid_reset_reload(
2394 struct pmcraid_instance *pinstance,
2395 u8 shutdown_type,
2396 u8 target_state
2397)
2398{
2399 struct pmcraid_cmd *reset_cmd = NULL;
2400 unsigned long lock_flags;
2401 int reset = 1;
2402
2403 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2404
2405 if (pinstance->ioa_reset_in_progress) {
2406 pmcraid_info("reset_reload: reset is already in progress\n");
2407
2408 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2409
2410 wait_event(pinstance->reset_wait_q,
2411 !pinstance->ioa_reset_in_progress);
2412
2413 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2414
2415 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2416 spin_unlock_irqrestore(pinstance->host->host_lock,
2417 lock_flags);
2418 pmcraid_info("reset_reload: IOA is dead\n");
2419 return reset;
2420 } else if (pinstance->ioa_state == target_state) {
2421 reset = 0;
2422 }
2423 }
2424
2425 if (reset) {
2426 pmcraid_info("reset_reload: proceeding with reset\n");
2427 scsi_block_requests(pinstance->host);
2428 reset_cmd = pmcraid_get_free_cmd(pinstance);
2429
2430 if (reset_cmd == NULL) {
2431 pmcraid_err("no free cmnd for reset_reload\n");
2432 spin_unlock_irqrestore(pinstance->host->host_lock,
2433 lock_flags);
2434 return reset;
2435 }
2436
2437 if (shutdown_type == SHUTDOWN_NORMAL)
2438 pinstance->ioa_bringdown = 1;
2439
2440 pinstance->ioa_shutdown_type = shutdown_type;
2441 pinstance->reset_cmd = reset_cmd;
2442 pinstance->force_ioa_reset = reset;
2443 pmcraid_info("reset_reload: initiating reset\n");
2444 pmcraid_ioa_reset(reset_cmd);
2445 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2446 pmcraid_info("reset_reload: waiting for reset to complete\n");
2447 wait_event(pinstance->reset_wait_q,
2448 !pinstance->ioa_reset_in_progress);
2449
2450 pmcraid_info("reset_reload: reset is complete !!\n");
2451 scsi_unblock_requests(pinstance->host);
2452 if (pinstance->ioa_state == target_state)
2453 reset = 0;
2454 }
2455
2456 return reset;
2457}
2458
2459/**
2460 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2461 *
2462 * @pinstance: pointer to adapter instance structure
2463 *
2464 * Return Value
2465 * whatever is returned from pmcraid_reset_reload
2466 */
2467static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2468{
2469 return pmcraid_reset_reload(pinstance,
2470 SHUTDOWN_NORMAL,
2471 IOA_STATE_UNKNOWN);
2472}
2473
2474/**
2475 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2476 *
2477 * @pinstance: pointer to adapter instance structure
2478 *
2479 * Return Value
2480 * whatever is returned from pmcraid_reset_reload
2481 */
2482static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2483{
2484 pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2485
2486 return pmcraid_reset_reload(pinstance,
2487 SHUTDOWN_NONE,
2488 IOA_STATE_OPERATIONAL);
2489}
2490
2491/**
2492 * pmcraid_request_sense - Send request sense to a device
2493 * @cmd: pmcraid command struct
2494 *
2495 * This function sends a request sense to a device as a result of a check
2496 * condition. This method re-uses the same command block that failed earlier.
2497 */
2498static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2499{
2500 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2501 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2502
2503 /* allocate DMAable memory for sense buffers */
2504 cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
2505 SCSI_SENSE_BUFFERSIZE,
2506 &cmd->sense_buffer_dma);
2507
2508 if (cmd->sense_buffer == NULL) {
2509 pmcraid_err
2510 ("couldn't allocate sense buffer for request sense\n");
2511 pmcraid_erp_done(cmd);
2512 return;
2513 }
2514
2515 /* re-use the command block */
2516 memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2517 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2518 ioarcb->request_flags0 = (SYNC_COMPLETE |
2519 NO_LINK_DESCS |
2520 INHIBIT_UL_CHECK);
2521 ioarcb->request_type = REQ_TYPE_SCSI;
2522 ioarcb->cdb[0] = REQUEST_SENSE;
2523 ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2524
2525 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2526 offsetof(struct pmcraid_ioarcb,
2527 add_data.u.ioadl[0]));
2528 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2529
2530 ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2531
2532 ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2533 ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2534 ioadl->flags = IOADL_FLAGS_LAST_DESC;
2535
2536 /* request sense might be called as part of error response processing
2537 * which runs in tasklets context. It is possible that mid-layer might
2538 * schedule queuecommand during this time, hence, writting to IOARRIN
2539 * must be protect by host_lock
2540 */
2541 pmcraid_send_cmd(cmd, pmcraid_erp_done,
2542 PMCRAID_REQUEST_SENSE_TIMEOUT,
2543 pmcraid_timeout_handler);
2544}
2545
2546/**
2547 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2548 * @cmd: command that failed
2549 * @sense: true if request_sense is required after cancel all
2550 *
2551 * This function sends a cancel all to a device to clear the queue.
2552 */
2553static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
2554{
2555 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2556 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2557 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2558 void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
2559 : pmcraid_request_sense;
2560
2561 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2562 ioarcb->request_flags0 = SYNC_OVERRIDE;
2563 ioarcb->request_type = REQ_TYPE_IOACMD;
2564 ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2565
2566 if (RES_IS_GSCSI(res->cfg_entry))
2567 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2568
2569 ioarcb->ioadl_bus_addr = 0;
2570 ioarcb->ioadl_length = 0;
2571 ioarcb->data_transfer_length = 0;
2572 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
2573
2574 /* writing to IOARRIN must be protected by host_lock, as mid-layer
2575 * schedule queuecommand while we are doing this
2576 */
2577 pmcraid_send_cmd(cmd, cmd_done,
2578 PMCRAID_REQUEST_SENSE_TIMEOUT,
2579 pmcraid_timeout_handler);
2580}
2581
2582/**
2583 * pmcraid_frame_auto_sense: frame fixed format sense information
2584 *
2585 * @cmd: pointer to failing command block
2586 *
2587 * Return value
2588 * none
2589 */
2590static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2591{
2592 u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2593 struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2594 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2595 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2596 u32 failing_lba = 0;
2597
2598 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2599 cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2600
2601 if (RES_IS_VSET(res->cfg_entry) &&
2602 ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2603 ioasa->u.vset.failing_lba_hi != 0) {
2604
2605 sense_buf[0] = 0x72;
2606 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2607 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2608 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2609
2610 sense_buf[7] = 12;
2611 sense_buf[8] = 0;
2612 sense_buf[9] = 0x0A;
2613 sense_buf[10] = 0x80;
2614
2615 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2616
2617 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2618 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2619 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2620 sense_buf[15] = failing_lba & 0x000000ff;
2621
2622 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2623
2624 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2625 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2626 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2627 sense_buf[19] = failing_lba & 0x000000ff;
2628 } else {
2629 sense_buf[0] = 0x70;
2630 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2631 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2632 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2633
2634 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2635 if (RES_IS_VSET(res->cfg_entry))
2636 failing_lba =
2637 le32_to_cpu(ioasa->u.
2638 vset.failing_lba_lo);
2639 sense_buf[0] |= 0x80;
2640 sense_buf[3] = (failing_lba >> 24) & 0xff;
2641 sense_buf[4] = (failing_lba >> 16) & 0xff;
2642 sense_buf[5] = (failing_lba >> 8) & 0xff;
2643 sense_buf[6] = failing_lba & 0xff;
2644 }
2645
2646 sense_buf[7] = 6; /* additional length */
2647 }
2648}
2649
2650/**
2651 * pmcraid_error_handler - Error response handlers for a SCSI op
2652 * @cmd: pointer to pmcraid_cmd that has failed
2653 *
2654 * This function determines whether or not to initiate ERP on the affected
2655 * device. This is called from a tasklet, which doesn't hold any locks.
2656 *
2657 * Return value:
2658 * 0 it caller can complete the request, otherwise 1 where in error
2659 * handler itself completes the request and returns the command block
2660 * back to free-pool
2661 */
2662static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2663{
2664 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2665 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2666 struct pmcraid_instance *pinstance = cmd->drv_inst;
2667 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2668 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2669 u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2670 u32 sense_copied = 0;
2671
2672 if (!res) {
2673 pmcraid_info("resource pointer is NULL\n");
2674 return 0;
2675 }
2676
2677 /* If this was a SCSI read/write command keep count of errors */
2678 if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2679 atomic_inc(&res->read_failures);
2680 else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2681 atomic_inc(&res->write_failures);
2682
2683 if (!RES_IS_GSCSI(res->cfg_entry) &&
2684 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2685 pmcraid_frame_auto_sense(cmd);
2686 }
2687
2688 /* Log IOASC/IOASA information based on user settings */
2689 pmcraid_ioasc_logger(ioasc, cmd);
2690
2691 switch (masked_ioasc) {
2692
2693 case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2694 scsi_cmd->result |= (DID_ABORT << 16);
2695 break;
2696
2697 case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2698 case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2699 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2700 break;
2701
2702 case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2703 res->sync_reqd = 1;
2704 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2705 break;
2706
2707 case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2708 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2709 break;
2710
2711 case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2712 case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2713 if (!res->reset_progress)
2714 scsi_report_bus_reset(pinstance->host,
2715 scsi_cmd->device->channel);
2716 scsi_cmd->result |= (DID_ERROR << 16);
2717 break;
2718
2719 case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2720 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2721 res->sync_reqd = 1;
2722
2723 /* if check_condition is not active return with error otherwise
2724 * get/frame the sense buffer
2725 */
2726 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2727 SAM_STAT_CHECK_CONDITION &&
2728 PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2729 return 0;
2730
2731 /* If we have auto sense data as part of IOASA pass it to
2732 * mid-layer
2733 */
2734 if (ioasa->auto_sense_length != 0) {
2735 short sense_len = ioasa->auto_sense_length;
2736 int data_size = min_t(u16, le16_to_cpu(sense_len),
2737 SCSI_SENSE_BUFFERSIZE);
2738
2739 memcpy(scsi_cmd->sense_buffer,
2740 ioasa->sense_data,
2741 data_size);
2742 sense_copied = 1;
2743 }
2744
2745 if (RES_IS_GSCSI(res->cfg_entry))
2746 pmcraid_cancel_all(cmd, sense_copied);
2747 else if (sense_copied)
2748 pmcraid_erp_done(cmd);
2749 else
2750 pmcraid_request_sense(cmd);
2751
2752 return 1;
2753
2754 case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2755 break;
2756
2757 default:
2758 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2759 scsi_cmd->result |= (DID_ERROR << 16);
2760 break;
2761 }
2762 return 0;
2763}
2764
2765/**
2766 * pmcraid_reset_device - device reset handler functions
2767 *
2768 * @scsi_cmd: scsi command struct
2769 * @modifier: reset modifier indicating the reset sequence to be performed
2770 *
2771 * This function issues a device reset to the affected device.
2772 * A LUN reset will be sent to the device first. If that does
2773 * not work, a target reset will be sent.
2774 *
2775 * Return value:
2776 * SUCCESS / FAILED
2777 */
2778static int pmcraid_reset_device(
2779 struct scsi_cmnd *scsi_cmd,
2780 unsigned long timeout,
2781 u8 modifier
2782)
2783{
2784 struct pmcraid_cmd *cmd;
2785 struct pmcraid_instance *pinstance;
2786 struct pmcraid_resource_entry *res;
2787 struct pmcraid_ioarcb *ioarcb;
2788 unsigned long lock_flags;
2789 u32 ioasc;
2790
2791 pinstance =
2792 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2793 res = scsi_cmd->device->hostdata;
2794
2795 if (!res) {
2796 sdev_printk(KERN_ERR, scsi_cmd->device,
2797 "reset_device: NULL resource pointer\n");
2798 return FAILED;
2799 }
2800
2801 /* If adapter is currently going through reset/reload, return failed.
2802 * This will force the mid-layer to call _eh_bus/host reset, which
2803 * will then go to sleep and wait for the reset to complete
2804 */
2805 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2806 if (pinstance->ioa_reset_in_progress ||
2807 pinstance->ioa_state == IOA_STATE_DEAD) {
2808 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2809 return FAILED;
2810 }
2811
2812 res->reset_progress = 1;
2813 pmcraid_info("Resetting %s resource with addr %x\n",
2814 ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2815 ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2816 le32_to_cpu(res->cfg_entry.resource_address));
2817
2818 /* get a free cmd block */
2819 cmd = pmcraid_get_free_cmd(pinstance);
2820
2821 if (cmd == NULL) {
2822 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2823 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2824 return FAILED;
2825 }
2826
2827 ioarcb = &cmd->ioa_cb->ioarcb;
2828 ioarcb->resource_handle = res->cfg_entry.resource_handle;
2829 ioarcb->request_type = REQ_TYPE_IOACMD;
2830 ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2831
2832 /* Initialize reset modifier bits */
2833 if (modifier)
2834 modifier = ENABLE_RESET_MODIFIER | modifier;
2835
2836 ioarcb->cdb[1] = modifier;
2837
2838 init_completion(&cmd->wait_for_completion);
2839 cmd->completion_req = 1;
2840
2841 pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2842 cmd->ioa_cb->ioarcb.cdb[0],
2843 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2844 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2845
2846 pmcraid_send_cmd(cmd,
2847 pmcraid_internal_done,
2848 timeout,
2849 pmcraid_timeout_handler);
2850
2851 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2852
2853 /* RESET_DEVICE command completes after all pending IOARCBs are
2854 * completed. Once this command is completed, pmcraind_internal_done
2855 * will wake up the 'completion' queue.
2856 */
2857 wait_for_completion(&cmd->wait_for_completion);
2858
2859 /* complete the command here itself and return the command block
2860 * to free list
2861 */
2862 pmcraid_return_cmd(cmd);
2863 res->reset_progress = 0;
2864 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2865
2866 /* set the return value based on the returned ioasc */
2867 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2868}
2869
2870/**
2871 * _pmcraid_io_done - helper for pmcraid_io_done function
2872 *
2873 * @cmd: pointer to pmcraid command struct
2874 * @reslen: residual data length to be set in the ioasa
2875 * @ioasc: ioasc either returned by IOA or set by driver itself.
2876 *
2877 * This function is invoked by pmcraid_io_done to complete mid-layer
2878 * scsi ops.
2879 *
2880 * Return value:
2881 * 0 if caller is required to return it to free_pool. Returns 1 if
2882 * caller need not worry about freeing command block as error handler
2883 * will take care of that.
2884 */
2885
2886static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2887{
2888 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2889 int rc = 0;
2890
2891 scsi_set_resid(scsi_cmd, reslen);
2892
2893 pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2894 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2895 cmd->ioa_cb->ioarcb.cdb[0],
2896 ioasc, scsi_cmd->result);
2897
2898 if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2899 rc = pmcraid_error_handler(cmd);
2900
2901 if (rc == 0) {
2902 scsi_dma_unmap(scsi_cmd);
2903 scsi_cmd->scsi_done(scsi_cmd);
2904 }
2905
2906 return rc;
2907}
2908
2909/**
2910 * pmcraid_io_done - SCSI completion function
2911 *
2912 * @cmd: pointer to pmcraid command struct
2913 *
2914 * This function is invoked by tasklet/mid-layer error handler to completing
2915 * the SCSI ops sent from mid-layer.
2916 *
2917 * Return value
2918 * none
2919 */
2920
2921static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2922{
2923 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2924 u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2925
2926 if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2927 pmcraid_return_cmd(cmd);
2928}
2929
2930/**
2931 * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2932 *
2933 * @cmd: command block of the command to be aborted
2934 *
2935 * Return Value:
2936 * returns pointer to command structure used as cancelling cmd
2937 */
2938static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2939{
2940 struct pmcraid_cmd *cancel_cmd;
2941 struct pmcraid_instance *pinstance;
2942 struct pmcraid_resource_entry *res;
2943
2944 pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2945 res = cmd->scsi_cmd->device->hostdata;
2946
2947 cancel_cmd = pmcraid_get_free_cmd(pinstance);
2948
2949 if (cancel_cmd == NULL) {
2950 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2951 return NULL;
2952 }
2953
2954 pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2955
2956 pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2957 cmd->ioa_cb->ioarcb.cdb[0],
2958 cmd->ioa_cb->ioarcb.response_handle >> 2);
2959
2960 init_completion(&cancel_cmd->wait_for_completion);
2961 cancel_cmd->completion_req = 1;
2962
2963 pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2964 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2965 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2966 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2967
2968 pmcraid_send_cmd(cancel_cmd,
2969 pmcraid_internal_done,
2970 PMCRAID_INTERNAL_TIMEOUT,
2971 pmcraid_timeout_handler);
2972 return cancel_cmd;
2973}
2974
2975/**
2976 * pmcraid_abort_complete - Waits for ABORT TASK completion
2977 *
2978 * @cancel_cmd: command block use as cancelling command
2979 *
2980 * Return Value:
2981 * returns SUCCESS if ABORT TASK has good completion
2982 * otherwise FAILED
2983 */
2984static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2985{
2986 struct pmcraid_resource_entry *res;
2987 u32 ioasc;
2988
2989 wait_for_completion(&cancel_cmd->wait_for_completion);
2990 res = cancel_cmd->res;
2991 cancel_cmd->res = NULL;
2992 ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2993
2994 /* If the abort task is not timed out we will get a Good completion
2995 * as sense_key, otherwise we may get one the following responses
2996 * due to subsequent bus reset or device reset. In case IOASC is
2997 * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2998 */
2999 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
3000 ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
3001 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
3002 res->sync_reqd = 1;
3003 ioasc = 0;
3004 }
3005
3006 /* complete the command here itself */
3007 pmcraid_return_cmd(cancel_cmd);
3008 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
3009}
3010
3011/**
3012 * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
3013 *
3014 * @scsi_cmd: scsi command struct given by mid-layer. When this is called
3015 * mid-layer ensures that no other commands are queued. This
3016 * never gets called under interrupt, but a separate eh thread.
3017 *
3018 * Return value:
3019 * SUCCESS / FAILED
3020 */
3021static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
3022{
3023 struct pmcraid_instance *pinstance;
3024 struct pmcraid_cmd *cmd;
3025 struct pmcraid_resource_entry *res;
3026 unsigned long host_lock_flags;
3027 unsigned long pending_lock_flags;
3028 struct pmcraid_cmd *cancel_cmd = NULL;
3029 int cmd_found = 0;
3030 int rc = FAILED;
3031
3032 pinstance =
3033 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3034
3035 scmd_printk(KERN_INFO, scsi_cmd,
3036 "I/O command timed out, aborting it.\n");
3037
3038 res = scsi_cmd->device->hostdata;
3039
3040 if (res == NULL)
3041 return rc;
3042
3043 /* If we are currently going through reset/reload, return failed.
3044 * This will force the mid-layer to eventually call
3045 * pmcraid_eh_host_reset which will then go to sleep and wait for the
3046 * reset to complete
3047 */
3048 spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
3049
3050 if (pinstance->ioa_reset_in_progress ||
3051 pinstance->ioa_state == IOA_STATE_DEAD) {
3052 spin_unlock_irqrestore(pinstance->host->host_lock,
3053 host_lock_flags);
3054 return rc;
3055 }
3056
3057 /* loop over pending cmd list to find cmd corresponding to this
3058 * scsi_cmd. Note that this command might not have been completed
3059 * already. locking: all pending commands are protected with
3060 * pending_pool_lock.
3061 */
3062 spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
3063 list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
3064
3065 if (cmd->scsi_cmd == scsi_cmd) {
3066 cmd_found = 1;
3067 break;
3068 }
3069 }
3070
3071 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3072 pending_lock_flags);
3073
3074 /* If the command to be aborted was given to IOA and still pending with
3075 * it, send ABORT_TASK to abort this and wait for its completion
3076 */
3077 if (cmd_found)
3078 cancel_cmd = pmcraid_abort_cmd(cmd);
3079
3080 spin_unlock_irqrestore(pinstance->host->host_lock,
3081 host_lock_flags);
3082
3083 if (cancel_cmd) {
3084 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3085 rc = pmcraid_abort_complete(cancel_cmd);
3086 }
3087
3088 return cmd_found ? rc : SUCCESS;
3089}
3090
3091/**
3092 * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
3093 *
3094 * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3095 *
3096 * All these routines invokve pmcraid_reset_device with appropriate parameters.
3097 * Since these are called from mid-layer EH thread, no other IO will be queued
3098 * to the resource being reset. However, control path (IOCTL) may be active so
3099 * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3100 * takes care by locking/unlocking host_lock.
3101 *
3102 * Return value
3103 * SUCCESS or FAILED
3104 */
3105static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3106{
3107 scmd_printk(KERN_INFO, scmd,
3108 "resetting device due to an I/O command timeout.\n");
3109 return pmcraid_reset_device(scmd,
3110 PMCRAID_INTERNAL_TIMEOUT,
3111 RESET_DEVICE_LUN);
3112}
3113
3114static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3115{
3116 scmd_printk(KERN_INFO, scmd,
3117 "Doing bus reset due to an I/O command timeout.\n");
3118 return pmcraid_reset_device(scmd,
3119 PMCRAID_RESET_BUS_TIMEOUT,
3120 RESET_DEVICE_BUS);
3121}
3122
3123static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3124{
3125 scmd_printk(KERN_INFO, scmd,
3126 "Doing target reset due to an I/O command timeout.\n");
3127 return pmcraid_reset_device(scmd,
3128 PMCRAID_INTERNAL_TIMEOUT,
3129 RESET_DEVICE_TARGET);
3130}
3131
3132/**
3133 * pmcraid_eh_host_reset_handler - adapter reset handler callback
3134 *
3135 * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3136 *
3137 * Initiates adapter reset to bring it up to operational state
3138 *
3139 * Return value
3140 * SUCCESS or FAILED
3141 */
3142static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3143{
3144 unsigned long interval = 10000; /* 10 seconds interval */
3145 int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3146 struct pmcraid_instance *pinstance =
3147 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3148
3149
3150 /* wait for an additional 150 seconds just in case firmware could come
3151 * up and if it could complete all the pending commands excluding the
3152 * two HCAM (CCN and LDN).
3153 */
3154 while (waits--) {
3155 if (atomic_read(&pinstance->outstanding_cmds) <=
3156 PMCRAID_MAX_HCAM_CMD)
3157 return SUCCESS;
3158 msleep(interval);
3159 }
3160
3161 dev_err(&pinstance->pdev->dev,
3162 "Adapter being reset due to an I/O command timeout.\n");
3163 return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3164}
3165
3166/**
3167 * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
3168 * @scsi_cmd: scsi command struct
3169 *
3170 * Return value
3171 * number of tags or 0 if the task is not tagged
3172 */
3173static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
3174{
3175 char tag[2];
3176 u8 rc = 0;
3177
3178 if (scsi_populate_tag_msg(scsi_cmd, tag)) {
3179 switch (tag[0]) {
3180 case MSG_SIMPLE_TAG:
3181 rc = TASK_TAG_SIMPLE;
3182 break;
3183 case MSG_HEAD_TAG:
3184 rc = TASK_TAG_QUEUE_HEAD;
3185 break;
3186 case MSG_ORDERED_TAG:
3187 rc = TASK_TAG_ORDERED;
3188 break;
3189 };
3190 }
3191
3192 return rc;
3193}
3194
3195
3196/**
3197 * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3198 * @cmd: pmcraid command struct
3199 * @sgcount: count of scatter-gather elements
3200 *
3201 * Return value
3202 * returns pointer pmcraid_ioadl_desc, initialized to point to internal
3203 * or external IOADLs
3204 */
3205struct pmcraid_ioadl_desc *
3206pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3207{
3208 struct pmcraid_ioadl_desc *ioadl;
3209 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3210 int ioadl_count = 0;
3211
3212 if (ioarcb->add_cmd_param_length)
3213 ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
3214 ioarcb->ioadl_length =
3215 sizeof(struct pmcraid_ioadl_desc) * sgcount;
3216
3217 if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3218 /* external ioadls start at offset 0x80 from control_block
3219 * structure, re-using 24 out of 27 ioadls part of IOARCB.
3220 * It is necessary to indicate to firmware that driver is
3221 * using ioadls to be treated as external to IOARCB.
3222 */
3223 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
3224 ioarcb->ioadl_bus_addr =
3225 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3226 offsetof(struct pmcraid_ioarcb,
3227 add_data.u.ioadl[3]));
3228 ioadl = &ioarcb->add_data.u.ioadl[3];
3229 } else {
3230 ioarcb->ioadl_bus_addr =
3231 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3232 offsetof(struct pmcraid_ioarcb,
3233 add_data.u.ioadl[ioadl_count]));
3234
3235 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3236 ioarcb->ioarcb_bus_addr |=
3237 DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
3238 }
3239
3240 return ioadl;
3241}
3242
3243/**
3244 * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3245 * @pinstance: pointer to adapter instance structure
3246 * @cmd: pmcraid command struct
3247 *
3248 * This function is invoked by queuecommand entry point while sending a command
3249 * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3250 *
3251 * Return value:
3252 * 0 on success or -1 on failure
3253 */
3254static int pmcraid_build_ioadl(
3255 struct pmcraid_instance *pinstance,
3256 struct pmcraid_cmd *cmd
3257)
3258{
3259 int i, nseg;
3260 struct scatterlist *sglist;
3261
3262 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3263 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3264 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
3265
3266 u32 length = scsi_bufflen(scsi_cmd);
3267
3268 if (!length)
3269 return 0;
3270
3271 nseg = scsi_dma_map(scsi_cmd);
3272
3273 if (nseg < 0) {
3274 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3275 return -1;
3276 } else if (nseg > PMCRAID_MAX_IOADLS) {
3277 scsi_dma_unmap(scsi_cmd);
3278 scmd_printk(KERN_ERR, scsi_cmd,
3279 "sg count is (%d) more than allowed!\n", nseg);
3280 return -1;
3281 }
3282
3283 /* Initialize IOARCB data transfer length fields */
3284 if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3285 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3286
3287 ioarcb->request_flags0 |= NO_LINK_DESCS;
3288 ioarcb->data_transfer_length = cpu_to_le32(length);
3289 ioadl = pmcraid_init_ioadls(cmd, nseg);
3290
3291 /* Initialize IOADL descriptor addresses */
3292 scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3293 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3294 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3295 ioadl[i].flags = 0;
3296 }
3297 /* setup last descriptor */
3298 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3299
3300 return 0;
3301}
3302
3303/**
3304 * pmcraid_free_sglist - Frees an allocated SG buffer list
3305 * @sglist: scatter/gather list pointer
3306 *
3307 * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3308 *
3309 * Return value:
3310 * none
3311 */
3312static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3313{
3314 int i;
3315
3316 for (i = 0; i < sglist->num_sg; i++)
3317 __free_pages(sg_page(&(sglist->scatterlist[i])),
3318 sglist->order);
3319
3320 kfree(sglist);
3321}
3322
3323/**
3324 * pmcraid_alloc_sglist - Allocates memory for a SG list
3325 * @buflen: buffer length
3326 *
3327 * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3328 * list.
3329 *
3330 * Return value
3331 * pointer to sglist / NULL on failure
3332 */
3333static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3334{
3335 struct pmcraid_sglist *sglist;
3336 struct scatterlist *scatterlist;
3337 struct page *page;
3338 int num_elem, i, j;
3339 int sg_size;
3340 int order;
3341 int bsize_elem;
3342
3343 sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3344 order = (sg_size > 0) ? get_order(sg_size) : 0;
3345 bsize_elem = PAGE_SIZE * (1 << order);
3346
3347 /* Determine the actual number of sg entries needed */
3348 if (buflen % bsize_elem)
3349 num_elem = (buflen / bsize_elem) + 1;
3350 else
3351 num_elem = buflen / bsize_elem;
3352
3353 /* Allocate a scatter/gather list for the DMA */
3354 sglist = kzalloc(sizeof(struct pmcraid_sglist) +
3355 (sizeof(struct scatterlist) * (num_elem - 1)),
3356 GFP_KERNEL);
3357
3358 if (sglist == NULL)
3359 return NULL;
3360
3361 scatterlist = sglist->scatterlist;
3362 sg_init_table(scatterlist, num_elem);
3363 sglist->order = order;
3364 sglist->num_sg = num_elem;
3365 sg_size = buflen;
3366
3367 for (i = 0; i < num_elem; i++) {
3368 page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
3369 if (!page) {
3370 for (j = i - 1; j >= 0; j--)
3371 __free_pages(sg_page(&scatterlist[j]), order);
3372 kfree(sglist);
3373 return NULL;
3374 }
3375
3376 sg_set_page(&scatterlist[i], page,
3377 sg_size < bsize_elem ? sg_size : bsize_elem, 0);
3378 sg_size -= bsize_elem;
3379 }
3380
3381 return sglist;
3382}
3383
3384/**
3385 * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3386 * @sglist: scatter/gather list pointer
3387 * @buffer: buffer pointer
3388 * @len: buffer length
3389 * @direction: data transfer direction
3390 *
3391 * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3392 *
3393 * Return value:
3394 * 0 on success / other on failure
3395 */
3396static int pmcraid_copy_sglist(
3397 struct pmcraid_sglist *sglist,
3398 unsigned long buffer,
3399 u32 len,
3400 int direction
3401)
3402{
3403 struct scatterlist *scatterlist;
3404 void *kaddr;
3405 int bsize_elem;
3406 int i;
3407 int rc = 0;
3408
3409 /* Determine the actual number of bytes per element */
3410 bsize_elem = PAGE_SIZE * (1 << sglist->order);
3411
3412 scatterlist = sglist->scatterlist;
3413
3414 for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
3415 struct page *page = sg_page(&scatterlist[i]);
3416
3417 kaddr = kmap(page);
3418 if (direction == DMA_TO_DEVICE)
3419 rc = __copy_from_user(kaddr,
3420 (void *)buffer,
3421 bsize_elem);
3422 else
3423 rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
3424
3425 kunmap(page);
3426
3427 if (rc) {
3428 pmcraid_err("failed to copy user data into sg list\n");
3429 return -EFAULT;
3430 }
3431
3432 scatterlist[i].length = bsize_elem;
3433 }
3434
3435 if (len % bsize_elem) {
3436 struct page *page = sg_page(&scatterlist[i]);
3437
3438 kaddr = kmap(page);
3439
3440 if (direction == DMA_TO_DEVICE)
3441 rc = __copy_from_user(kaddr,
3442 (void *)buffer,
3443 len % bsize_elem);
3444 else
3445 rc = __copy_to_user((void *)buffer,
3446 kaddr,
3447 len % bsize_elem);
3448
3449 kunmap(page);
3450
3451 scatterlist[i].length = len % bsize_elem;
3452 }
3453
3454 if (rc) {
3455 pmcraid_err("failed to copy user data into sg list\n");
3456 rc = -EFAULT;
3457 }
3458
3459 return rc;
3460}
3461
3462/**
3463 * pmcraid_queuecommand - Queue a mid-layer request
3464 * @scsi_cmd: scsi command struct
3465 * @done: done function
3466 *
3467 * This function queues a request generated by the mid-layer. Midlayer calls
3468 * this routine within host->lock. Some of the functions called by queuecommand
3469 * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3470 *
3471 * Return value:
3472 * 0 on success
3473 * SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3474 * SCSI_MLQUEUE_HOST_BUSY if host is busy
3475 */
3476static int pmcraid_queuecommand_lck(
3477 struct scsi_cmnd *scsi_cmd,
3478 void (*done) (struct scsi_cmnd *)
3479)
3480{
3481 struct pmcraid_instance *pinstance;
3482 struct pmcraid_resource_entry *res;
3483 struct pmcraid_ioarcb *ioarcb;
3484 struct pmcraid_cmd *cmd;
3485 u32 fw_version;
3486 int rc = 0;
3487
3488 pinstance =
3489 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3490 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3491 scsi_cmd->scsi_done = done;
3492 res = scsi_cmd->device->hostdata;
3493 scsi_cmd->result = (DID_OK << 16);
3494
3495 /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3496 * the command
3497 */
3498 if (pinstance->ioa_state == IOA_STATE_DEAD) {
3499 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3500 scsi_cmd->result = (DID_NO_CONNECT << 16);
3501 scsi_cmd->scsi_done(scsi_cmd);
3502 return 0;
3503 }
3504
3505 /* If IOA reset is in progress, can't queue the commands */
3506 if (pinstance->ioa_reset_in_progress)
3507 return SCSI_MLQUEUE_HOST_BUSY;
3508
3509 /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3510 * the command here itself with success return
3511 */
3512 if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3513 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3514 scsi_cmd->scsi_done(scsi_cmd);
3515 return 0;
3516 }
3517
3518 /* initialize the command and IOARCB to be sent to IOA */
3519 cmd = pmcraid_get_free_cmd(pinstance);
3520
3521 if (cmd == NULL) {
3522 pmcraid_err("free command block is not available\n");
3523 return SCSI_MLQUEUE_HOST_BUSY;
3524 }
3525
3526 cmd->scsi_cmd = scsi_cmd;
3527 ioarcb = &(cmd->ioa_cb->ioarcb);
3528 memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3529 ioarcb->resource_handle = res->cfg_entry.resource_handle;
3530 ioarcb->request_type = REQ_TYPE_SCSI;
3531
3532 /* set hrrq number where the IOA should respond to. Note that all cmds
3533 * generated internally uses hrrq_id 0, exception to this is the cmd
3534 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3535 * hrrq_id assigned here in queuecommand
3536 */
3537 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3538 pinstance->num_hrrq;
3539 cmd->cmd_done = pmcraid_io_done;
3540
3541 if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3542 if (scsi_cmd->underflow == 0)
3543 ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3544
3545 if (res->sync_reqd) {
3546 ioarcb->request_flags0 |= SYNC_COMPLETE;
3547 res->sync_reqd = 0;
3548 }
3549
3550 ioarcb->request_flags0 |= NO_LINK_DESCS;
3551 ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);
3552
3553 if (RES_IS_GSCSI(res->cfg_entry))
3554 ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3555 }
3556
3557 rc = pmcraid_build_ioadl(pinstance, cmd);
3558
3559 pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3560 le32_to_cpu(ioarcb->response_handle) >> 2,
3561 scsi_cmd->cmnd[0], pinstance->host->unique_id,
3562 RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3563 PMCRAID_PHYS_BUS_ID,
3564 RES_IS_VSET(res->cfg_entry) ?
3565 (fw_version <= PMCRAID_FW_VERSION_1 ?
3566 res->cfg_entry.unique_flags1 :
3567 res->cfg_entry.array_id & 0xFF) :
3568 RES_TARGET(res->cfg_entry.resource_address),
3569 RES_LUN(res->cfg_entry.resource_address));
3570
3571 if (likely(rc == 0)) {
3572 _pmcraid_fire_command(cmd);
3573 } else {
3574 pmcraid_err("queuecommand could not build ioadl\n");
3575 pmcraid_return_cmd(cmd);
3576 rc = SCSI_MLQUEUE_HOST_BUSY;
3577 }
3578
3579 return rc;
3580}
3581
3582static DEF_SCSI_QCMD(pmcraid_queuecommand)
3583
3584/**
3585 * pmcraid_open -char node "open" entry, allowed only users with admin access
3586 */
3587static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3588{
3589 struct pmcraid_instance *pinstance;
3590
3591 if (!capable(CAP_SYS_ADMIN))
3592 return -EACCES;
3593
3594 /* Populate adapter instance * pointer for use by ioctl */
3595 pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3596 filep->private_data = pinstance;
3597
3598 return 0;
3599}
3600
3601/**
3602 * pmcraid_release - char node "release" entry point
3603 */
3604static int pmcraid_chr_release(struct inode *inode, struct file *filep)
3605{
3606 struct pmcraid_instance *pinstance = filep->private_data;
3607
3608 filep->private_data = NULL;
3609 fasync_helper(-1, filep, 0, &pinstance->aen_queue);
3610
3611 return 0;
3612}
3613
3614/**
3615 * pmcraid_fasync - Async notifier registration from applications
3616 *
3617 * This function adds the calling process to a driver global queue. When an
3618 * event occurs, SIGIO will be sent to all processes in this queue.
3619 */
3620static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3621{
3622 struct pmcraid_instance *pinstance;
3623 int rc;
3624
3625 pinstance = filep->private_data;
3626 mutex_lock(&pinstance->aen_queue_lock);
3627 rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3628 mutex_unlock(&pinstance->aen_queue_lock);
3629
3630 return rc;
3631}
3632
3633
3634/**
3635 * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3636 * commands sent over IOCTL interface
3637 *
3638 * @cmd : pointer to struct pmcraid_cmd
3639 * @buflen : length of the request buffer
3640 * @direction : data transfer direction
3641 *
3642 * Return value
3643 * 0 on success, non-zero error code on failure
3644 */
3645static int pmcraid_build_passthrough_ioadls(
3646 struct pmcraid_cmd *cmd,
3647 int buflen,
3648 int direction
3649)
3650{
3651 struct pmcraid_sglist *sglist = NULL;
3652 struct scatterlist *sg = NULL;
3653 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3654 struct pmcraid_ioadl_desc *ioadl;
3655 int i;
3656
3657 sglist = pmcraid_alloc_sglist(buflen);
3658
3659 if (!sglist) {
3660 pmcraid_err("can't allocate memory for passthrough SGls\n");
3661 return -ENOMEM;
3662 }
3663
3664 sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
3665 sglist->scatterlist,
3666 sglist->num_sg, direction);
3667
3668 if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3669 dev_err(&cmd->drv_inst->pdev->dev,
3670 "Failed to map passthrough buffer!\n");
3671 pmcraid_free_sglist(sglist);
3672 return -EIO;
3673 }
3674
3675 cmd->sglist = sglist;
3676 ioarcb->request_flags0 |= NO_LINK_DESCS;
3677
3678 ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3679
3680 /* Initialize IOADL descriptor addresses */
3681 for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3682 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3683 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3684 ioadl[i].flags = 0;
3685 }
3686
3687 /* setup the last descriptor */
3688 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3689
3690 return 0;
3691}
3692
3693
3694/**
3695 * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3696 *
3697 * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3698 * @buflen: size of the request buffer
3699 * @direction: data transfer direction
3700 *
3701 * Return value
3702 * 0 on success, non-zero error code on failure
3703 */
3704static void pmcraid_release_passthrough_ioadls(
3705 struct pmcraid_cmd *cmd,
3706 int buflen,
3707 int direction
3708)
3709{
3710 struct pmcraid_sglist *sglist = cmd->sglist;
3711
3712 if (buflen > 0) {
3713 pci_unmap_sg(cmd->drv_inst->pdev,
3714 sglist->scatterlist,
3715 sglist->num_sg,
3716 direction);
3717 pmcraid_free_sglist(sglist);
3718 cmd->sglist = NULL;
3719 }
3720}
3721
3722/**
3723 * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3724 *
3725 * @pinstance: pointer to adapter instance structure
3726 * @cmd: ioctl code
3727 * @arg: pointer to pmcraid_passthrough_buffer user buffer
3728 *
3729 * Return value
3730 * 0 on success, non-zero error code on failure
3731 */
3732static long pmcraid_ioctl_passthrough(
3733 struct pmcraid_instance *pinstance,
3734 unsigned int ioctl_cmd,
3735 unsigned int buflen,
3736 unsigned long arg
3737)
3738{
3739 struct pmcraid_passthrough_ioctl_buffer *buffer;
3740 struct pmcraid_ioarcb *ioarcb;
3741 struct pmcraid_cmd *cmd;
3742 struct pmcraid_cmd *cancel_cmd;
3743 unsigned long request_buffer;
3744 unsigned long request_offset;
3745 unsigned long lock_flags;
3746 void *ioasa;
3747 u32 ioasc;
3748 int request_size;
3749 int buffer_size;
3750 u8 access, direction;
3751 int rc = 0;
3752
3753 /* If IOA reset is in progress, wait 10 secs for reset to complete */
3754 if (pinstance->ioa_reset_in_progress) {
3755 rc = wait_event_interruptible_timeout(
3756 pinstance->reset_wait_q,
3757 !pinstance->ioa_reset_in_progress,
3758 msecs_to_jiffies(10000));
3759
3760 if (!rc)
3761 return -ETIMEDOUT;
3762 else if (rc < 0)
3763 return -ERESTARTSYS;
3764 }
3765
3766 /* If adapter is not in operational state, return error */
3767 if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3768 pmcraid_err("IOA is not operational\n");
3769 return -ENOTTY;
3770 }
3771
3772 buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3773 buffer = kmalloc(buffer_size, GFP_KERNEL);
3774
3775 if (!buffer) {
3776 pmcraid_err("no memory for passthrough buffer\n");
3777 return -ENOMEM;
3778 }
3779
3780 request_offset =
3781 offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3782
3783 request_buffer = arg + request_offset;
3784
3785 rc = __copy_from_user(buffer,
3786 (struct pmcraid_passthrough_ioctl_buffer *) arg,
3787 sizeof(struct pmcraid_passthrough_ioctl_buffer));
3788
3789 ioasa =
3790 (void *)(arg +
3791 offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
3792
3793 if (rc) {
3794 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3795 rc = -EFAULT;
3796 goto out_free_buffer;
3797 }
3798
3799 request_size = buffer->ioarcb.data_transfer_length;
3800
3801 if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3802 access = VERIFY_READ;
3803 direction = DMA_TO_DEVICE;
3804 } else {
3805 access = VERIFY_WRITE;
3806 direction = DMA_FROM_DEVICE;
3807 }
3808
3809 if (request_size > 0) {
3810 rc = access_ok(access, arg, request_offset + request_size);
3811
3812 if (!rc) {
3813 rc = -EFAULT;
3814 goto out_free_buffer;
3815 }
3816 } else if (request_size < 0) {
3817 rc = -EINVAL;
3818 goto out_free_buffer;
3819 }
3820
3821 /* check if we have any additional command parameters */
3822 if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
3823 rc = -EINVAL;
3824 goto out_free_buffer;
3825 }
3826
3827 cmd = pmcraid_get_free_cmd(pinstance);
3828
3829 if (!cmd) {
3830 pmcraid_err("free command block is not available\n");
3831 rc = -ENOMEM;
3832 goto out_free_buffer;
3833 }
3834
3835 cmd->scsi_cmd = NULL;
3836 ioarcb = &(cmd->ioa_cb->ioarcb);
3837
3838 /* Copy the user-provided IOARCB stuff field by field */
3839 ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3840 ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3841 ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3842 ioarcb->request_type = buffer->ioarcb.request_type;
3843 ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3844 ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3845 memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3846
3847 if (buffer->ioarcb.add_cmd_param_length) {
3848 ioarcb->add_cmd_param_length =
3849 buffer->ioarcb.add_cmd_param_length;
3850 ioarcb->add_cmd_param_offset =
3851 buffer->ioarcb.add_cmd_param_offset;
3852 memcpy(ioarcb->add_data.u.add_cmd_params,
3853 buffer->ioarcb.add_data.u.add_cmd_params,
3854 buffer->ioarcb.add_cmd_param_length);
3855 }
3856
3857 /* set hrrq number where the IOA should respond to. Note that all cmds
3858 * generated internally uses hrrq_id 0, exception to this is the cmd
3859 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3860 * hrrq_id assigned here in queuecommand
3861 */
3862 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3863 pinstance->num_hrrq;
3864
3865 if (request_size) {
3866 rc = pmcraid_build_passthrough_ioadls(cmd,
3867 request_size,
3868 direction);
3869 if (rc) {
3870 pmcraid_err("couldn't build passthrough ioadls\n");
3871 goto out_free_buffer;
3872 }
3873 } else if (request_size < 0) {
3874 rc = -EINVAL;
3875 goto out_free_buffer;
3876 }
3877
3878 /* If data is being written into the device, copy the data from user
3879 * buffers
3880 */
3881 if (direction == DMA_TO_DEVICE && request_size > 0) {
3882 rc = pmcraid_copy_sglist(cmd->sglist,
3883 request_buffer,
3884 request_size,
3885 direction);
3886 if (rc) {
3887 pmcraid_err("failed to copy user buffer\n");
3888 goto out_free_sglist;
3889 }
3890 }
3891
3892 /* passthrough ioctl is a blocking command so, put the user to sleep
3893 * until timeout. Note that a timeout value of 0 means, do timeout.
3894 */
3895 cmd->cmd_done = pmcraid_internal_done;
3896 init_completion(&cmd->wait_for_completion);
3897 cmd->completion_req = 1;
3898
3899 pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3900 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3901 cmd->ioa_cb->ioarcb.cdb[0],
3902 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3903
3904 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3905 _pmcraid_fire_command(cmd);
3906 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3907
3908 /* NOTE ! Remove the below line once abort_task is implemented
3909 * in firmware. This line disables ioctl command timeout handling logic
3910 * similar to IO command timeout handling, making ioctl commands to wait
3911 * until the command completion regardless of timeout value specified in
3912 * ioarcb
3913 */
3914 buffer->ioarcb.cmd_timeout = 0;
3915
3916 /* If command timeout is specified put caller to wait till that time,
3917 * otherwise it would be blocking wait. If command gets timed out, it
3918 * will be aborted.
3919 */
3920 if (buffer->ioarcb.cmd_timeout == 0) {
3921 wait_for_completion(&cmd->wait_for_completion);
3922 } else if (!wait_for_completion_timeout(
3923 &cmd->wait_for_completion,
3924 msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
3925
3926 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3927 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
3928 cmd->ioa_cb->ioarcb.cdb[0]);
3929
3930 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3931 cancel_cmd = pmcraid_abort_cmd(cmd);
3932 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3933
3934 if (cancel_cmd) {
3935 wait_for_completion(&cancel_cmd->wait_for_completion);
3936 ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
3937 pmcraid_return_cmd(cancel_cmd);
3938
3939 /* if abort task couldn't find the command i.e it got
3940 * completed prior to aborting, return good completion.
3941 * if command got aborted successfully or there was IOA
3942 * reset due to abort task itself getting timedout then
3943 * return -ETIMEDOUT
3944 */
3945 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3946 PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3947 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3948 rc = -ETIMEDOUT;
3949 goto out_handle_response;
3950 }
3951 }
3952
3953 /* no command block for abort task or abort task failed to abort
3954 * the IOARCB, then wait for 150 more seconds and initiate reset
3955 * sequence after timeout
3956 */
3957 if (!wait_for_completion_timeout(
3958 &cmd->wait_for_completion,
3959 msecs_to_jiffies(150 * 1000))) {
3960 pmcraid_reset_bringup(cmd->drv_inst);
3961 rc = -ETIMEDOUT;
3962 }
3963 }
3964
3965out_handle_response:
3966 /* copy entire IOASA buffer and return IOCTL success.
3967 * If copying IOASA to user-buffer fails, return
3968 * EFAULT
3969 */
3970 if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3971 sizeof(struct pmcraid_ioasa))) {
3972 pmcraid_err("failed to copy ioasa buffer to user\n");
3973 rc = -EFAULT;
3974 }
3975
3976 /* If the data transfer was from device, copy the data onto user
3977 * buffers
3978 */
3979 else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3980 rc = pmcraid_copy_sglist(cmd->sglist,
3981 request_buffer,
3982 request_size,
3983 direction);
3984 if (rc) {
3985 pmcraid_err("failed to copy user buffer\n");
3986 rc = -EFAULT;
3987 }
3988 }
3989
3990out_free_sglist:
3991 pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3992 pmcraid_return_cmd(cmd);
3993
3994out_free_buffer:
3995 kfree(buffer);
3996
3997 return rc;
3998}
3999
4000
4001
4002
4003/**
4004 * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
4005 *
4006 * @pinstance: pointer to adapter instance structure
4007 * @cmd: ioctl command passed in
4008 * @buflen: length of user_buffer
4009 * @user_buffer: user buffer pointer
4010 *
4011 * Return Value
4012 * 0 in case of success, otherwise appropriate error code
4013 */
4014static long pmcraid_ioctl_driver(
4015 struct pmcraid_instance *pinstance,
4016 unsigned int cmd,
4017 unsigned int buflen,
4018 void __user *user_buffer
4019)
4020{
4021 int rc = -ENOSYS;
4022
4023 if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
4024 pmcraid_err("ioctl_driver: access fault in request buffer\n");
4025 return -EFAULT;
4026 }
4027
4028 switch (cmd) {
4029 case PMCRAID_IOCTL_RESET_ADAPTER:
4030 pmcraid_reset_bringup(pinstance);
4031 rc = 0;
4032 break;
4033
4034 default:
4035 break;
4036 }
4037
4038 return rc;
4039}
4040
4041/**
4042 * pmcraid_check_ioctl_buffer - check for proper access to user buffer
4043 *
4044 * @cmd: ioctl command
4045 * @arg: user buffer
4046 * @hdr: pointer to kernel memory for pmcraid_ioctl_header
4047 *
4048 * Return Value
4049 * negetive error code if there are access issues, otherwise zero.
4050 * Upon success, returns ioctl header copied out of user buffer.
4051 */
4052
4053static int pmcraid_check_ioctl_buffer(
4054 int cmd,
4055 void __user *arg,
4056 struct pmcraid_ioctl_header *hdr
4057)
4058{
4059 int rc = 0;
4060 int access = VERIFY_READ;
4061
4062 if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
4063 pmcraid_err("couldn't copy ioctl header from user buffer\n");
4064 return -EFAULT;
4065 }
4066
4067 /* check for valid driver signature */
4068 rc = memcmp(hdr->signature,
4069 PMCRAID_IOCTL_SIGNATURE,
4070 sizeof(hdr->signature));
4071 if (rc) {
4072 pmcraid_err("signature verification failed\n");
4073 return -EINVAL;
4074 }
4075
4076 /* check for appropriate buffer access */
4077 if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
4078 access = VERIFY_WRITE;
4079
4080 rc = access_ok(access,
4081 (arg + sizeof(struct pmcraid_ioctl_header)),
4082 hdr->buffer_length);
4083 if (!rc) {
4084 pmcraid_err("access failed for user buffer of size %d\n",
4085 hdr->buffer_length);
4086 return -EFAULT;
4087 }
4088
4089 return 0;
4090}
4091
4092/**
4093 * pmcraid_ioctl - char node ioctl entry point
4094 */
4095static long pmcraid_chr_ioctl(
4096 struct file *filep,
4097 unsigned int cmd,
4098 unsigned long arg
4099)
4100{
4101 struct pmcraid_instance *pinstance = NULL;
4102 struct pmcraid_ioctl_header *hdr = NULL;
4103 int retval = -ENOTTY;
4104
4105 hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
4106
4107 if (!hdr) {
4108 pmcraid_err("failed to allocate memory for ioctl header\n");
4109 return -ENOMEM;
4110 }
4111
4112 retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
4113
4114 if (retval) {
4115 pmcraid_info("chr_ioctl: header check failed\n");
4116 kfree(hdr);
4117 return retval;
4118 }
4119
4120 pinstance = filep->private_data;
4121
4122 if (!pinstance) {
4123 pmcraid_info("adapter instance is not found\n");
4124 kfree(hdr);
4125 return -ENOTTY;
4126 }
4127
4128 switch (_IOC_TYPE(cmd)) {
4129
4130 case PMCRAID_PASSTHROUGH_IOCTL:
4131 /* If ioctl code is to download microcode, we need to block
4132 * mid-layer requests.
4133 */
4134 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4135 scsi_block_requests(pinstance->host);
4136
4137 retval = pmcraid_ioctl_passthrough(pinstance,
4138 cmd,
4139 hdr->buffer_length,
4140 arg);
4141
4142 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4143 scsi_unblock_requests(pinstance->host);
4144 break;
4145
4146 case PMCRAID_DRIVER_IOCTL:
4147 arg += sizeof(struct pmcraid_ioctl_header);
4148 retval = pmcraid_ioctl_driver(pinstance,
4149 cmd,
4150 hdr->buffer_length,
4151 (void __user *)arg);
4152 break;
4153
4154 default:
4155 retval = -ENOTTY;
4156 break;
4157 }
4158
4159 kfree(hdr);
4160
4161 return retval;
4162}
4163
4164/**
4165 * File operations structure for management interface
4166 */
4167static const struct file_operations pmcraid_fops = {
4168 .owner = THIS_MODULE,
4169 .open = pmcraid_chr_open,
4170 .release = pmcraid_chr_release,
4171 .fasync = pmcraid_chr_fasync,
4172 .unlocked_ioctl = pmcraid_chr_ioctl,
4173#ifdef CONFIG_COMPAT
4174 .compat_ioctl = pmcraid_chr_ioctl,
4175#endif
4176 .llseek = noop_llseek,
4177};
4178
4179
4180
4181
4182/**
4183 * pmcraid_show_log_level - Display adapter's error logging level
4184 * @dev: class device struct
4185 * @buf: buffer
4186 *
4187 * Return value:
4188 * number of bytes printed to buffer
4189 */
4190static ssize_t pmcraid_show_log_level(
4191 struct device *dev,
4192 struct device_attribute *attr,
4193 char *buf)
4194{
4195 struct Scsi_Host *shost = class_to_shost(dev);
4196 struct pmcraid_instance *pinstance =
4197 (struct pmcraid_instance *)shost->hostdata;
4198 return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
4199}
4200
4201/**
4202 * pmcraid_store_log_level - Change the adapter's error logging level
4203 * @dev: class device struct
4204 * @buf: buffer
4205 * @count: not used
4206 *
4207 * Return value:
4208 * number of bytes printed to buffer
4209 */
4210static ssize_t pmcraid_store_log_level(
4211 struct device *dev,
4212 struct device_attribute *attr,
4213 const char *buf,
4214 size_t count
4215)
4216{
4217 struct Scsi_Host *shost;
4218 struct pmcraid_instance *pinstance;
4219 unsigned long val;
4220
4221 if (strict_strtoul(buf, 10, &val))
4222 return -EINVAL;
4223 /* log-level should be from 0 to 2 */
4224 if (val > 2)
4225 return -EINVAL;
4226
4227 shost = class_to_shost(dev);
4228 pinstance = (struct pmcraid_instance *)shost->hostdata;
4229 pinstance->current_log_level = val;
4230
4231 return strlen(buf);
4232}
4233
4234static struct device_attribute pmcraid_log_level_attr = {
4235 .attr = {
4236 .name = "log_level",
4237 .mode = S_IRUGO | S_IWUSR,
4238 },
4239 .show = pmcraid_show_log_level,
4240 .store = pmcraid_store_log_level,
4241};
4242
4243/**
4244 * pmcraid_show_drv_version - Display driver version
4245 * @dev: class device struct
4246 * @buf: buffer
4247 *
4248 * Return value:
4249 * number of bytes printed to buffer
4250 */
4251static ssize_t pmcraid_show_drv_version(
4252 struct device *dev,
4253 struct device_attribute *attr,
4254 char *buf
4255)
4256{
4257 return snprintf(buf, PAGE_SIZE, "version: %s\n",
4258 PMCRAID_DRIVER_VERSION);
4259}
4260
4261static struct device_attribute pmcraid_driver_version_attr = {
4262 .attr = {
4263 .name = "drv_version",
4264 .mode = S_IRUGO,
4265 },
4266 .show = pmcraid_show_drv_version,
4267};
4268
4269/**
4270 * pmcraid_show_io_adapter_id - Display driver assigned adapter id
4271 * @dev: class device struct
4272 * @buf: buffer
4273 *
4274 * Return value:
4275 * number of bytes printed to buffer
4276 */
4277static ssize_t pmcraid_show_adapter_id(
4278 struct device *dev,
4279 struct device_attribute *attr,
4280 char *buf
4281)
4282{
4283 struct Scsi_Host *shost = class_to_shost(dev);
4284 struct pmcraid_instance *pinstance =
4285 (struct pmcraid_instance *)shost->hostdata;
4286 u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4287 pinstance->pdev->devfn;
4288 u32 aen_group = pmcraid_event_family.id;
4289
4290 return snprintf(buf, PAGE_SIZE,
4291 "adapter id: %d\nminor: %d\naen group: %d\n",
4292 adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4293}
4294
4295static struct device_attribute pmcraid_adapter_id_attr = {
4296 .attr = {
4297 .name = "adapter_id",
4298 .mode = S_IRUGO | S_IWUSR,
4299 },
4300 .show = pmcraid_show_adapter_id,
4301};
4302
4303static struct device_attribute *pmcraid_host_attrs[] = {
4304 &pmcraid_log_level_attr,
4305 &pmcraid_driver_version_attr,
4306 &pmcraid_adapter_id_attr,
4307 NULL,
4308};
4309
4310
4311/* host template structure for pmcraid driver */
4312static struct scsi_host_template pmcraid_host_template = {
4313 .module = THIS_MODULE,
4314 .name = PMCRAID_DRIVER_NAME,
4315 .queuecommand = pmcraid_queuecommand,
4316 .eh_abort_handler = pmcraid_eh_abort_handler,
4317 .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4318 .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4319 .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4320 .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4321
4322 .slave_alloc = pmcraid_slave_alloc,
4323 .slave_configure = pmcraid_slave_configure,
4324 .slave_destroy = pmcraid_slave_destroy,
4325 .change_queue_depth = pmcraid_change_queue_depth,
4326 .change_queue_type = pmcraid_change_queue_type,
4327 .can_queue = PMCRAID_MAX_IO_CMD,
4328 .this_id = -1,
4329 .sg_tablesize = PMCRAID_MAX_IOADLS,
4330 .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4331 .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4332 .use_clustering = ENABLE_CLUSTERING,
4333 .shost_attrs = pmcraid_host_attrs,
4334 .proc_name = PMCRAID_DRIVER_NAME
4335};
4336
4337/*
4338 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4339 * @irq: interrupt vector number
4340 * @dev_id: pointer hrrq_vector
4341 *
4342 * Return Value
4343 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4344 */
4345
4346static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4347{
4348 struct pmcraid_isr_param *hrrq_vector;
4349 struct pmcraid_instance *pinstance;
4350 unsigned long lock_flags;
4351 u32 intrs_val;
4352 int hrrq_id;
4353
4354 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4355 hrrq_id = hrrq_vector->hrrq_id;
4356 pinstance = hrrq_vector->drv_inst;
4357
4358 if (!hrrq_id) {
4359 /* Read the interrupt */
4360 intrs_val = pmcraid_read_interrupts(pinstance);
4361 if (intrs_val &&
4362 ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4363 & DOORBELL_INTR_MSIX_CLR) == 0)) {
4364 /* Any error interrupts including unit_check,
4365 * initiate IOA reset.In case of unit check indicate
4366 * to reset_sequence that IOA unit checked and prepare
4367 * for a dump during reset sequence
4368 */
4369 if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4370 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4371 pinstance->ioa_unit_check = 1;
4372
4373 pmcraid_err("ISR: error interrupts: %x \
4374 initiating reset\n", intrs_val);
4375 spin_lock_irqsave(pinstance->host->host_lock,
4376 lock_flags);
4377 pmcraid_initiate_reset(pinstance);
4378 spin_unlock_irqrestore(
4379 pinstance->host->host_lock,
4380 lock_flags);
4381 }
4382 /* If interrupt was as part of the ioa initialization,
4383 * clear it. Delete the timer and wakeup the
4384 * reset engine to proceed with reset sequence
4385 */
4386 if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4387 pmcraid_clr_trans_op(pinstance);
4388
4389 /* Clear the interrupt register by writing
4390 * to host to ioa doorbell. Once done
4391 * FW will clear the interrupt.
4392 */
4393 iowrite32(DOORBELL_INTR_MSIX_CLR,
4394 pinstance->int_regs.host_ioa_interrupt_reg);
4395 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4396
4397
4398 }
4399 }
4400
4401 tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4402
4403 return IRQ_HANDLED;
4404}
4405
4406/**
4407 * pmcraid_isr - implements legacy interrupt handling routine
4408 *
4409 * @irq: interrupt vector number
4410 * @dev_id: pointer hrrq_vector
4411 *
4412 * Return Value
4413 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4414 */
4415static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4416{
4417 struct pmcraid_isr_param *hrrq_vector;
4418 struct pmcraid_instance *pinstance;
4419 u32 intrs;
4420 unsigned long lock_flags;
4421 int hrrq_id = 0;
4422
4423 /* In case of legacy interrupt mode where interrupts are shared across
4424 * isrs, it may be possible that the current interrupt is not from IOA
4425 */
4426 if (!dev_id) {
4427 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4428 return IRQ_NONE;
4429 }
4430 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4431 pinstance = hrrq_vector->drv_inst;
4432
4433 intrs = pmcraid_read_interrupts(pinstance);
4434
4435 if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4436 return IRQ_NONE;
4437
4438 /* Any error interrupts including unit_check, initiate IOA reset.
4439 * In case of unit check indicate to reset_sequence that IOA unit
4440 * checked and prepare for a dump during reset sequence
4441 */
4442 if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4443
4444 if (intrs & INTRS_IOA_UNIT_CHECK)
4445 pinstance->ioa_unit_check = 1;
4446
4447 iowrite32(intrs,
4448 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4449 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4450 intrs);
4451 intrs = ioread32(
4452 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4453 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4454 pmcraid_initiate_reset(pinstance);
4455 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4456 } else {
4457 /* If interrupt was as part of the ioa initialization,
4458 * clear. Delete the timer and wakeup the
4459 * reset engine to proceed with reset sequence
4460 */
4461 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4462 pmcraid_clr_trans_op(pinstance);
4463 } else {
4464 iowrite32(intrs,
4465 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4466 ioread32(
4467 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4468
4469 tasklet_schedule(
4470 &(pinstance->isr_tasklet[hrrq_id]));
4471 }
4472 }
4473
4474 return IRQ_HANDLED;
4475}
4476
4477
4478/**
4479 * pmcraid_worker_function - worker thread function
4480 *
4481 * @workp: pointer to struct work queue
4482 *
4483 * Return Value
4484 * None
4485 */
4486
4487static void pmcraid_worker_function(struct work_struct *workp)
4488{
4489 struct pmcraid_instance *pinstance;
4490 struct pmcraid_resource_entry *res;
4491 struct pmcraid_resource_entry *temp;
4492 struct scsi_device *sdev;
4493 unsigned long lock_flags;
4494 unsigned long host_lock_flags;
4495 u16 fw_version;
4496 u8 bus, target, lun;
4497
4498 pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4499 /* add resources only after host is added into system */
4500 if (!atomic_read(&pinstance->expose_resources))
4501 return;
4502
4503 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4504
4505 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4506 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4507
4508 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4509 sdev = res->scsi_dev;
4510
4511 /* host_lock must be held before calling
4512 * scsi_device_get
4513 */
4514 spin_lock_irqsave(pinstance->host->host_lock,
4515 host_lock_flags);
4516 if (!scsi_device_get(sdev)) {
4517 spin_unlock_irqrestore(
4518 pinstance->host->host_lock,
4519 host_lock_flags);
4520 pmcraid_info("deleting %x from midlayer\n",
4521 res->cfg_entry.resource_address);
4522 list_move_tail(&res->queue,
4523 &pinstance->free_res_q);
4524 spin_unlock_irqrestore(
4525 &pinstance->resource_lock,
4526 lock_flags);
4527 scsi_remove_device(sdev);
4528 scsi_device_put(sdev);
4529 spin_lock_irqsave(&pinstance->resource_lock,
4530 lock_flags);
4531 res->change_detected = 0;
4532 } else {
4533 spin_unlock_irqrestore(
4534 pinstance->host->host_lock,
4535 host_lock_flags);
4536 }
4537 }
4538 }
4539
4540 list_for_each_entry(res, &pinstance->used_res_q, queue) {
4541
4542 if (res->change_detected == RES_CHANGE_ADD) {
4543
4544 if (!pmcraid_expose_resource(fw_version,
4545 &res->cfg_entry))
4546 continue;
4547
4548 if (RES_IS_VSET(res->cfg_entry)) {
4549 bus = PMCRAID_VSET_BUS_ID;
4550 if (fw_version <= PMCRAID_FW_VERSION_1)
4551 target = res->cfg_entry.unique_flags1;
4552 else
4553 target = res->cfg_entry.array_id & 0xFF;
4554 lun = PMCRAID_VSET_LUN_ID;
4555 } else {
4556 bus = PMCRAID_PHYS_BUS_ID;
4557 target =
4558 RES_TARGET(
4559 res->cfg_entry.resource_address);
4560 lun = RES_LUN(res->cfg_entry.resource_address);
4561 }
4562
4563 res->change_detected = 0;
4564 spin_unlock_irqrestore(&pinstance->resource_lock,
4565 lock_flags);
4566 scsi_add_device(pinstance->host, bus, target, lun);
4567 spin_lock_irqsave(&pinstance->resource_lock,
4568 lock_flags);
4569 }
4570 }
4571
4572 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4573}
4574
4575/**
4576 * pmcraid_tasklet_function - Tasklet function
4577 *
4578 * @instance: pointer to msix param structure
4579 *
4580 * Return Value
4581 * None
4582 */
4583static void pmcraid_tasklet_function(unsigned long instance)
4584{
4585 struct pmcraid_isr_param *hrrq_vector;
4586 struct pmcraid_instance *pinstance;
4587 unsigned long hrrq_lock_flags;
4588 unsigned long pending_lock_flags;
4589 unsigned long host_lock_flags;
4590 spinlock_t *lockp; /* hrrq buffer lock */
4591 int id;
4592 __le32 resp;
4593
4594 hrrq_vector = (struct pmcraid_isr_param *)instance;
4595 pinstance = hrrq_vector->drv_inst;
4596 id = hrrq_vector->hrrq_id;
4597 lockp = &(pinstance->hrrq_lock[id]);
4598
4599 /* loop through each of the commands responded by IOA. Each HRRQ buf is
4600 * protected by its own lock. Traversals must be done within this lock
4601 * as there may be multiple tasklets running on multiple CPUs. Note
4602 * that the lock is held just for picking up the response handle and
4603 * manipulating hrrq_curr/toggle_bit values.
4604 */
4605 spin_lock_irqsave(lockp, hrrq_lock_flags);
4606
4607 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4608
4609 while ((resp & HRRQ_TOGGLE_BIT) ==
4610 pinstance->host_toggle_bit[id]) {
4611
4612 int cmd_index = resp >> 2;
4613 struct pmcraid_cmd *cmd = NULL;
4614
4615 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4616 pinstance->hrrq_curr[id]++;
4617 } else {
4618 pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4619 pinstance->host_toggle_bit[id] ^= 1u;
4620 }
4621
4622 if (cmd_index >= PMCRAID_MAX_CMD) {
4623 /* In case of invalid response handle, log message */
4624 pmcraid_err("Invalid response handle %d\n", cmd_index);
4625 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4626 continue;
4627 }
4628
4629 cmd = pinstance->cmd_list[cmd_index];
4630 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4631
4632 spin_lock_irqsave(&pinstance->pending_pool_lock,
4633 pending_lock_flags);
4634 list_del(&cmd->free_list);
4635 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4636 pending_lock_flags);
4637 del_timer(&cmd->timer);
4638 atomic_dec(&pinstance->outstanding_cmds);
4639
4640 if (cmd->cmd_done == pmcraid_ioa_reset) {
4641 spin_lock_irqsave(pinstance->host->host_lock,
4642 host_lock_flags);
4643 cmd->cmd_done(cmd);
4644 spin_unlock_irqrestore(pinstance->host->host_lock,
4645 host_lock_flags);
4646 } else if (cmd->cmd_done != NULL) {
4647 cmd->cmd_done(cmd);
4648 }
4649 /* loop over until we are done with all responses */
4650 spin_lock_irqsave(lockp, hrrq_lock_flags);
4651 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4652 }
4653
4654 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4655}
4656
4657/**
4658 * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4659 * @pinstance: pointer to adapter instance structure
4660 *
4661 * This routine un-registers registered interrupt handler and
4662 * also frees irqs/vectors.
4663 *
4664 * Retun Value
4665 * None
4666 */
4667static
4668void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4669{
4670 int i;
4671
4672 for (i = 0; i < pinstance->num_hrrq; i++)
4673 free_irq(pinstance->hrrq_vector[i].vector,
4674 &(pinstance->hrrq_vector[i]));
4675
4676 if (pinstance->interrupt_mode) {
4677 pci_disable_msix(pinstance->pdev);
4678 pinstance->interrupt_mode = 0;
4679 }
4680}
4681
4682/**
4683 * pmcraid_register_interrupt_handler - registers interrupt handler
4684 * @pinstance: pointer to per-adapter instance structure
4685 *
4686 * Return Value
4687 * 0 on success, non-zero error code otherwise.
4688 */
4689static int
4690pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4691{
4692 int rc;
4693 struct pci_dev *pdev = pinstance->pdev;
4694
4695 if ((pmcraid_enable_msix) &&
4696 (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
4697 int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
4698 struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
4699 int i;
4700 for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
4701 entries[i].entry = i;
4702
4703 rc = pci_enable_msix(pdev, entries, num_hrrq);
4704 if (rc < 0)
4705 goto pmcraid_isr_legacy;
4706
4707 /* Check how many MSIX vectors are allocated and register
4708 * msi-x handlers for each of them giving appropriate buffer
4709 */
4710 if (rc > 0) {
4711 num_hrrq = rc;
4712 if (pci_enable_msix(pdev, entries, num_hrrq))
4713 goto pmcraid_isr_legacy;
4714 }
4715
4716 for (i = 0; i < num_hrrq; i++) {
4717 pinstance->hrrq_vector[i].hrrq_id = i;
4718 pinstance->hrrq_vector[i].drv_inst = pinstance;
4719 pinstance->hrrq_vector[i].vector = entries[i].vector;
4720 rc = request_irq(pinstance->hrrq_vector[i].vector,
4721 pmcraid_isr_msix, 0,
4722 PMCRAID_DRIVER_NAME,
4723 &(pinstance->hrrq_vector[i]));
4724
4725 if (rc) {
4726 int j;
4727 for (j = 0; j < i; j++)
4728 free_irq(entries[j].vector,
4729 &(pinstance->hrrq_vector[j]));
4730 pci_disable_msix(pdev);
4731 goto pmcraid_isr_legacy;
4732 }
4733 }
4734
4735 pinstance->num_hrrq = num_hrrq;
4736 pinstance->interrupt_mode = 1;
4737 iowrite32(DOORBELL_INTR_MODE_MSIX,
4738 pinstance->int_regs.host_ioa_interrupt_reg);
4739 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4740 goto pmcraid_isr_out;
4741 }
4742
4743pmcraid_isr_legacy:
4744 /* If MSI-X registration failed fallback to legacy mode, where
4745 * only one hrrq entry will be used
4746 */
4747 pinstance->hrrq_vector[0].hrrq_id = 0;
4748 pinstance->hrrq_vector[0].drv_inst = pinstance;
4749 pinstance->hrrq_vector[0].vector = pdev->irq;
4750 pinstance->num_hrrq = 1;
4751 rc = 0;
4752
4753 rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
4754 PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
4755pmcraid_isr_out:
4756 return rc;
4757}
4758
4759/**
4760 * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4761 * @pinstance: per adapter instance structure pointer
4762 * @max_index: number of buffer blocks to release
4763 *
4764 * Return Value
4765 * None
4766 */
4767static void
4768pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4769{
4770 int i;
4771 for (i = 0; i < max_index; i++) {
4772 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4773 pinstance->cmd_list[i] = NULL;
4774 }
4775 kmem_cache_destroy(pinstance->cmd_cachep);
4776 pinstance->cmd_cachep = NULL;
4777}
4778
4779/**
4780 * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4781 * @pinstance: pointer to per adapter instance structure
4782 * @max_index: number of buffers (from 0 onwards) to release
4783 *
4784 * This function assumes that the command blocks for which control blocks are
4785 * linked are not released.
4786 *
4787 * Return Value
4788 * None
4789 */
4790static void
4791pmcraid_release_control_blocks(
4792 struct pmcraid_instance *pinstance,
4793 int max_index
4794)
4795{
4796 int i;
4797
4798 if (pinstance->control_pool == NULL)
4799 return;
4800
4801 for (i = 0; i < max_index; i++) {
4802 pci_pool_free(pinstance->control_pool,
4803 pinstance->cmd_list[i]->ioa_cb,
4804 pinstance->cmd_list[i]->ioa_cb_bus_addr);
4805 pinstance->cmd_list[i]->ioa_cb = NULL;
4806 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4807 }
4808 pci_pool_destroy(pinstance->control_pool);
4809 pinstance->control_pool = NULL;
4810}
4811
4812/**
4813 * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4814 * @pinstance - pointer to per adapter instance structure
4815 *
4816 * Allocates memory for command blocks using kernel slab allocator.
4817 *
4818 * Return Value
4819 * 0 in case of success; -ENOMEM in case of failure
4820 */
4821static int __devinit
4822pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4823{
4824 int i;
4825
4826 sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4827 pinstance->host->unique_id);
4828
4829
4830 pinstance->cmd_cachep = kmem_cache_create(
4831 pinstance->cmd_pool_name,
4832 sizeof(struct pmcraid_cmd), 0,
4833 SLAB_HWCACHE_ALIGN, NULL);
4834 if (!pinstance->cmd_cachep)
4835 return -ENOMEM;
4836
4837 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4838 pinstance->cmd_list[i] =
4839 kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4840 if (!pinstance->cmd_list[i]) {
4841 pmcraid_release_cmd_blocks(pinstance, i);
4842 return -ENOMEM;
4843 }
4844 }
4845 return 0;
4846}
4847
4848/**
4849 * pmcraid_allocate_control_blocks - allocates memory control blocks
4850 * @pinstance : pointer to per adapter instance structure
4851 *
4852 * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4853 * and IOASAs. This is called after command blocks are already allocated.
4854 *
4855 * Return Value
4856 * 0 in case it can allocate all control blocks, otherwise -ENOMEM
4857 */
4858static int __devinit
4859pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4860{
4861 int i;
4862
4863 sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4864 pinstance->host->unique_id);
4865
4866 pinstance->control_pool =
4867 pci_pool_create(pinstance->ctl_pool_name,
4868 pinstance->pdev,
4869 sizeof(struct pmcraid_control_block),
4870 PMCRAID_IOARCB_ALIGNMENT, 0);
4871
4872 if (!pinstance->control_pool)
4873 return -ENOMEM;
4874
4875 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4876 pinstance->cmd_list[i]->ioa_cb =
4877 pci_pool_alloc(
4878 pinstance->control_pool,
4879 GFP_KERNEL,
4880 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4881
4882 if (!pinstance->cmd_list[i]->ioa_cb) {
4883 pmcraid_release_control_blocks(pinstance, i);
4884 return -ENOMEM;
4885 }
4886 memset(pinstance->cmd_list[i]->ioa_cb, 0,
4887 sizeof(struct pmcraid_control_block));
4888 }
4889 return 0;
4890}
4891
4892/**
4893 * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4894 * @pinstance: pointer to per adapter instance structure
4895 * @maxindex: size of hrrq buffer pointer array
4896 *
4897 * Return Value
4898 * None
4899 */
4900static void
4901pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4902{
4903 int i;
4904 for (i = 0; i < maxindex; i++) {
4905
4906 pci_free_consistent(pinstance->pdev,
4907 HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4908 pinstance->hrrq_start[i],
4909 pinstance->hrrq_start_bus_addr[i]);
4910
4911 /* reset pointers and toggle bit to zeros */
4912 pinstance->hrrq_start[i] = NULL;
4913 pinstance->hrrq_start_bus_addr[i] = 0;
4914 pinstance->host_toggle_bit[i] = 0;
4915 }
4916}
4917
4918/**
4919 * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4920 * @pinstance: pointer to per adapter instance structure
4921 *
4922 * Return value
4923 * 0 hrrq buffers are allocated, -ENOMEM otherwise.
4924 */
4925static int __devinit
4926pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4927{
4928 int i, buffer_size;
4929
4930 buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4931
4932 for (i = 0; i < pinstance->num_hrrq; i++) {
4933 pinstance->hrrq_start[i] =
4934 pci_alloc_consistent(
4935 pinstance->pdev,
4936 buffer_size,
4937 &(pinstance->hrrq_start_bus_addr[i]));
4938
4939 if (pinstance->hrrq_start[i] == 0) {
4940 pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4941 i);
4942 pmcraid_release_host_rrqs(pinstance, i);
4943 return -ENOMEM;
4944 }
4945
4946 memset(pinstance->hrrq_start[i], 0, buffer_size);
4947 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4948 pinstance->hrrq_end[i] =
4949 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4950 pinstance->host_toggle_bit[i] = 1;
4951 spin_lock_init(&pinstance->hrrq_lock[i]);
4952 }
4953 return 0;
4954}
4955
4956/**
4957 * pmcraid_release_hcams - release HCAM buffers
4958 *
4959 * @pinstance: pointer to per adapter instance structure
4960 *
4961 * Return value
4962 * none
4963 */
4964static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4965{
4966 if (pinstance->ccn.msg != NULL) {
4967 pci_free_consistent(pinstance->pdev,
4968 PMCRAID_AEN_HDR_SIZE +
4969 sizeof(struct pmcraid_hcam_ccn_ext),
4970 pinstance->ccn.msg,
4971 pinstance->ccn.baddr);
4972
4973 pinstance->ccn.msg = NULL;
4974 pinstance->ccn.hcam = NULL;
4975 pinstance->ccn.baddr = 0;
4976 }
4977
4978 if (pinstance->ldn.msg != NULL) {
4979 pci_free_consistent(pinstance->pdev,
4980 PMCRAID_AEN_HDR_SIZE +
4981 sizeof(struct pmcraid_hcam_ldn),
4982 pinstance->ldn.msg,
4983 pinstance->ldn.baddr);
4984
4985 pinstance->ldn.msg = NULL;
4986 pinstance->ldn.hcam = NULL;
4987 pinstance->ldn.baddr = 0;
4988 }
4989}
4990
4991/**
4992 * pmcraid_allocate_hcams - allocates HCAM buffers
4993 * @pinstance : pointer to per adapter instance structure
4994 *
4995 * Return Value:
4996 * 0 in case of successful allocation, non-zero otherwise
4997 */
4998static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4999{
5000 pinstance->ccn.msg = pci_alloc_consistent(
5001 pinstance->pdev,
5002 PMCRAID_AEN_HDR_SIZE +
5003 sizeof(struct pmcraid_hcam_ccn_ext),
5004 &(pinstance->ccn.baddr));
5005
5006 pinstance->ldn.msg = pci_alloc_consistent(
5007 pinstance->pdev,
5008 PMCRAID_AEN_HDR_SIZE +
5009 sizeof(struct pmcraid_hcam_ldn),
5010 &(pinstance->ldn.baddr));
5011
5012 if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
5013 pmcraid_release_hcams(pinstance);
5014 } else {
5015 pinstance->ccn.hcam =
5016 (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
5017 pinstance->ldn.hcam =
5018 (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
5019
5020 atomic_set(&pinstance->ccn.ignore, 0);
5021 atomic_set(&pinstance->ldn.ignore, 0);
5022 }
5023
5024 return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
5025}
5026
5027/**
5028 * pmcraid_release_config_buffers - release config.table buffers
5029 * @pinstance: pointer to per adapter instance structure
5030 *
5031 * Return Value
5032 * none
5033 */
5034static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
5035{
5036 if (pinstance->cfg_table != NULL &&
5037 pinstance->cfg_table_bus_addr != 0) {
5038 pci_free_consistent(pinstance->pdev,
5039 sizeof(struct pmcraid_config_table),
5040 pinstance->cfg_table,
5041 pinstance->cfg_table_bus_addr);
5042 pinstance->cfg_table = NULL;
5043 pinstance->cfg_table_bus_addr = 0;
5044 }
5045
5046 if (pinstance->res_entries != NULL) {
5047 int i;
5048
5049 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5050 list_del(&pinstance->res_entries[i].queue);
5051 kfree(pinstance->res_entries);
5052 pinstance->res_entries = NULL;
5053 }
5054
5055 pmcraid_release_hcams(pinstance);
5056}
5057
5058/**
5059 * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
5060 * @pinstance : pointer to per adapter instance structure
5061 *
5062 * Return Value
5063 * 0 for successful allocation, -ENOMEM for any failure
5064 */
5065static int __devinit
5066pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
5067{
5068 int i;
5069
5070 pinstance->res_entries =
5071 kzalloc(sizeof(struct pmcraid_resource_entry) *
5072 PMCRAID_MAX_RESOURCES, GFP_KERNEL);
5073
5074 if (NULL == pinstance->res_entries) {
5075 pmcraid_err("failed to allocate memory for resource table\n");
5076 return -ENOMEM;
5077 }
5078
5079 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5080 list_add_tail(&pinstance->res_entries[i].queue,
5081 &pinstance->free_res_q);
5082
5083 pinstance->cfg_table =
5084 pci_alloc_consistent(pinstance->pdev,
5085 sizeof(struct pmcraid_config_table),
5086 &pinstance->cfg_table_bus_addr);
5087
5088 if (NULL == pinstance->cfg_table) {
5089 pmcraid_err("couldn't alloc DMA memory for config table\n");
5090 pmcraid_release_config_buffers(pinstance);
5091 return -ENOMEM;
5092 }
5093
5094 if (pmcraid_allocate_hcams(pinstance)) {
5095 pmcraid_err("could not alloc DMA memory for HCAMS\n");
5096 pmcraid_release_config_buffers(pinstance);
5097 return -ENOMEM;
5098 }
5099
5100 return 0;
5101}
5102
5103/**
5104 * pmcraid_init_tasklets - registers tasklets for response handling
5105 *
5106 * @pinstance: pointer adapter instance structure
5107 *
5108 * Return value
5109 * none
5110 */
5111static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
5112{
5113 int i;
5114 for (i = 0; i < pinstance->num_hrrq; i++)
5115 tasklet_init(&pinstance->isr_tasklet[i],
5116 pmcraid_tasklet_function,
5117 (unsigned long)&pinstance->hrrq_vector[i]);
5118}
5119
5120/**
5121 * pmcraid_kill_tasklets - destroys tasklets registered for response handling
5122 *
5123 * @pinstance: pointer to adapter instance structure
5124 *
5125 * Return value
5126 * none
5127 */
5128static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
5129{
5130 int i;
5131 for (i = 0; i < pinstance->num_hrrq; i++)
5132 tasklet_kill(&pinstance->isr_tasklet[i]);
5133}
5134
5135/**
5136 * pmcraid_release_buffers - release per-adapter buffers allocated
5137 *
5138 * @pinstance: pointer to adapter soft state
5139 *
5140 * Return Value
5141 * none
5142 */
5143static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
5144{
5145 pmcraid_release_config_buffers(pinstance);
5146 pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
5147 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5148 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5149
5150 if (pinstance->inq_data != NULL) {
5151 pci_free_consistent(pinstance->pdev,
5152 sizeof(struct pmcraid_inquiry_data),
5153 pinstance->inq_data,
5154 pinstance->inq_data_baddr);
5155
5156 pinstance->inq_data = NULL;
5157 pinstance->inq_data_baddr = 0;
5158 }
5159
5160 if (pinstance->timestamp_data != NULL) {
5161 pci_free_consistent(pinstance->pdev,
5162 sizeof(struct pmcraid_timestamp_data),
5163 pinstance->timestamp_data,
5164 pinstance->timestamp_data_baddr);
5165
5166 pinstance->timestamp_data = NULL;
5167 pinstance->timestamp_data_baddr = 0;
5168 }
5169}
5170
5171/**
5172 * pmcraid_init_buffers - allocates memory and initializes various structures
5173 * @pinstance: pointer to per adapter instance structure
5174 *
5175 * This routine pre-allocates memory based on the type of block as below:
5176 * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
5177 * IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator
5178 * config-table entries : DMAable memory using pci_alloc_consistent
5179 * HostRRQs : DMAable memory, using pci_alloc_consistent
5180 *
5181 * Return Value
5182 * 0 in case all of the blocks are allocated, -ENOMEM otherwise.
5183 */
5184static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance)
5185{
5186 int i;
5187
5188 if (pmcraid_allocate_host_rrqs(pinstance)) {
5189 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
5190 pinstance->num_hrrq);
5191 return -ENOMEM;
5192 }
5193
5194 if (pmcraid_allocate_config_buffers(pinstance)) {
5195 pmcraid_err("couldn't allocate memory for config buffers\n");
5196 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5197 return -ENOMEM;
5198 }
5199
5200 if (pmcraid_allocate_cmd_blocks(pinstance)) {
5201 pmcraid_err("couldn't allocate memory for cmd blocks\n");
5202 pmcraid_release_config_buffers(pinstance);
5203 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5204 return -ENOMEM;
5205 }
5206
5207 if (pmcraid_allocate_control_blocks(pinstance)) {
5208 pmcraid_err("couldn't allocate memory control blocks\n");
5209 pmcraid_release_config_buffers(pinstance);
5210 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5211 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5212 return -ENOMEM;
5213 }
5214
5215 /* allocate DMAable memory for page D0 INQUIRY buffer */
5216 pinstance->inq_data = pci_alloc_consistent(
5217 pinstance->pdev,
5218 sizeof(struct pmcraid_inquiry_data),
5219 &pinstance->inq_data_baddr);
5220
5221 if (pinstance->inq_data == NULL) {
5222 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
5223 pmcraid_release_buffers(pinstance);
5224 return -ENOMEM;
5225 }
5226
5227 /* allocate DMAable memory for set timestamp data buffer */
5228 pinstance->timestamp_data = pci_alloc_consistent(
5229 pinstance->pdev,
5230 sizeof(struct pmcraid_timestamp_data),
5231 &pinstance->timestamp_data_baddr);
5232
5233 if (pinstance->timestamp_data == NULL) {
5234 pmcraid_err("couldn't allocate DMA memory for \
5235 set time_stamp \n");
5236 pmcraid_release_buffers(pinstance);
5237 return -ENOMEM;
5238 }
5239
5240
5241 /* Initialize all the command blocks and add them to free pool. No
5242 * need to lock (free_pool_lock) as this is done in initialization
5243 * itself
5244 */
5245 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5246 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5247 pmcraid_init_cmdblk(cmdp, i);
5248 cmdp->drv_inst = pinstance;
5249 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5250 }
5251
5252 return 0;
5253}
5254
5255/**
5256 * pmcraid_reinit_buffers - resets various buffer pointers
5257 * @pinstance: pointer to adapter instance
5258 * Return value
5259 * none
5260 */
5261static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5262{
5263 int i;
5264 int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5265
5266 for (i = 0; i < pinstance->num_hrrq; i++) {
5267 memset(pinstance->hrrq_start[i], 0, buffer_size);
5268 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5269 pinstance->hrrq_end[i] =
5270 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5271 pinstance->host_toggle_bit[i] = 1;
5272 }
5273}
5274
5275/**
5276 * pmcraid_init_instance - initialize per instance data structure
5277 * @pdev: pointer to pci device structure
5278 * @host: pointer to Scsi_Host structure
5279 * @mapped_pci_addr: memory mapped IOA configuration registers
5280 *
5281 * Return Value
5282 * 0 on success, non-zero in case of any failure
5283 */
5284static int __devinit pmcraid_init_instance(
5285 struct pci_dev *pdev,
5286 struct Scsi_Host *host,
5287 void __iomem *mapped_pci_addr
5288)
5289{
5290 struct pmcraid_instance *pinstance =
5291 (struct pmcraid_instance *)host->hostdata;
5292
5293 pinstance->host = host;
5294 pinstance->pdev = pdev;
5295
5296 /* Initialize register addresses */
5297 pinstance->mapped_dma_addr = mapped_pci_addr;
5298
5299 /* Initialize chip-specific details */
5300 {
5301 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5302 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5303
5304 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5305
5306 pint_regs->ioa_host_interrupt_reg =
5307 mapped_pci_addr + chip_cfg->ioa_host_intr;
5308 pint_regs->ioa_host_interrupt_clr_reg =
5309 mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5310 pint_regs->ioa_host_msix_interrupt_reg =
5311 mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5312 pint_regs->host_ioa_interrupt_reg =
5313 mapped_pci_addr + chip_cfg->host_ioa_intr;
5314 pint_regs->host_ioa_interrupt_clr_reg =
5315 mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5316
5317 /* Current version of firmware exposes interrupt mask set
5318 * and mask clr registers through memory mapped bar0.
5319 */
5320 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5321 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5322 pint_regs->ioa_host_interrupt_mask_reg =
5323 mapped_pci_addr + chip_cfg->ioa_host_mask;
5324 pint_regs->ioa_host_interrupt_mask_clr_reg =
5325 mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5326 pint_regs->global_interrupt_mask_reg =
5327 mapped_pci_addr + chip_cfg->global_intr_mask;
5328 };
5329
5330 pinstance->ioa_reset_attempts = 0;
5331 init_waitqueue_head(&pinstance->reset_wait_q);
5332
5333 atomic_set(&pinstance->outstanding_cmds, 0);
5334 atomic_set(&pinstance->last_message_id, 0);
5335 atomic_set(&pinstance->expose_resources, 0);
5336
5337 INIT_LIST_HEAD(&pinstance->free_res_q);
5338 INIT_LIST_HEAD(&pinstance->used_res_q);
5339 INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5340 INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5341
5342 spin_lock_init(&pinstance->free_pool_lock);
5343 spin_lock_init(&pinstance->pending_pool_lock);
5344 spin_lock_init(&pinstance->resource_lock);
5345 mutex_init(&pinstance->aen_queue_lock);
5346
5347 /* Work-queue (Shared) for deferred processing error handling */
5348 INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5349
5350 /* Initialize the default log_level */
5351 pinstance->current_log_level = pmcraid_log_level;
5352
5353 /* Setup variables required for reset engine */
5354 pinstance->ioa_state = IOA_STATE_UNKNOWN;
5355 pinstance->reset_cmd = NULL;
5356 return 0;
5357}
5358
5359/**
5360 * pmcraid_shutdown - shutdown adapter controller.
5361 * @pdev: pci device struct
5362 *
5363 * Issues an adapter shutdown to the card waits for its completion
5364 *
5365 * Return value
5366 * none
5367 */
5368static void pmcraid_shutdown(struct pci_dev *pdev)
5369{
5370 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5371 pmcraid_reset_bringdown(pinstance);
5372}
5373
5374
5375/**
5376 * pmcraid_get_minor - returns unused minor number from minor number bitmap
5377 */
5378static unsigned short pmcraid_get_minor(void)
5379{
5380 int minor;
5381
5382 minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
5383 __set_bit(minor, pmcraid_minor);
5384 return minor;
5385}
5386
5387/**
5388 * pmcraid_release_minor - releases given minor back to minor number bitmap
5389 */
5390static void pmcraid_release_minor(unsigned short minor)
5391{
5392 __clear_bit(minor, pmcraid_minor);
5393}
5394
5395/**
5396 * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5397 *
5398 * @pinstance: pointer to adapter instance for which to register device
5399 *
5400 * Return value
5401 * 0 in case of success, otherwise non-zero
5402 */
5403static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5404{
5405 int minor;
5406 int error;
5407
5408 minor = pmcraid_get_minor();
5409 cdev_init(&pinstance->cdev, &pmcraid_fops);
5410 pinstance->cdev.owner = THIS_MODULE;
5411
5412 error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5413
5414 if (error)
5415 pmcraid_release_minor(minor);
5416 else
5417 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5418 NULL, "%s%u", PMCRAID_DEVFILE, minor);
5419 return error;
5420}
5421
5422/**
5423 * pmcraid_release_chrdev - unregisters per-adapter management interface
5424 *
5425 * @pinstance: pointer to adapter instance structure
5426 *
5427 * Return value
5428 * none
5429 */
5430static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5431{
5432 pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5433 device_destroy(pmcraid_class,
5434 MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5435 cdev_del(&pinstance->cdev);
5436}
5437
5438/**
5439 * pmcraid_remove - IOA hot plug remove entry point
5440 * @pdev: pci device struct
5441 *
5442 * Return value
5443 * none
5444 */
5445static void __devexit pmcraid_remove(struct pci_dev *pdev)
5446{
5447 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5448
5449 /* remove the management interface (/dev file) for this device */
5450 pmcraid_release_chrdev(pinstance);
5451
5452 /* remove host template from scsi midlayer */
5453 scsi_remove_host(pinstance->host);
5454
5455 /* block requests from mid-layer */
5456 scsi_block_requests(pinstance->host);
5457
5458 /* initiate shutdown adapter */
5459 pmcraid_shutdown(pdev);
5460
5461 pmcraid_disable_interrupts(pinstance, ~0);
5462 flush_work_sync(&pinstance->worker_q);
5463
5464 pmcraid_kill_tasklets(pinstance);
5465 pmcraid_unregister_interrupt_handler(pinstance);
5466 pmcraid_release_buffers(pinstance);
5467 iounmap(pinstance->mapped_dma_addr);
5468 pci_release_regions(pdev);
5469 scsi_host_put(pinstance->host);
5470 pci_disable_device(pdev);
5471
5472 return;
5473}
5474
5475#ifdef CONFIG_PM
5476/**
5477 * pmcraid_suspend - driver suspend entry point for power management
5478 * @pdev: PCI device structure
5479 * @state: PCI power state to suspend routine
5480 *
5481 * Return Value - 0 always
5482 */
5483static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
5484{
5485 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5486
5487 pmcraid_shutdown(pdev);
5488 pmcraid_disable_interrupts(pinstance, ~0);
5489 pmcraid_kill_tasklets(pinstance);
5490 pci_set_drvdata(pinstance->pdev, pinstance);
5491 pmcraid_unregister_interrupt_handler(pinstance);
5492 pci_save_state(pdev);
5493 pci_disable_device(pdev);
5494 pci_set_power_state(pdev, pci_choose_state(pdev, state));
5495
5496 return 0;
5497}
5498
5499/**
5500 * pmcraid_resume - driver resume entry point PCI power management
5501 * @pdev: PCI device structure
5502 *
5503 * Return Value - 0 in case of success. Error code in case of any failure
5504 */
5505static int pmcraid_resume(struct pci_dev *pdev)
5506{
5507 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5508 struct Scsi_Host *host = pinstance->host;
5509 int rc;
5510
5511 pci_set_power_state(pdev, PCI_D0);
5512 pci_enable_wake(pdev, PCI_D0, 0);
5513 pci_restore_state(pdev);
5514
5515 rc = pci_enable_device(pdev);
5516
5517 if (rc) {
5518 dev_err(&pdev->dev, "resume: Enable device failed\n");
5519 return rc;
5520 }
5521
5522 pci_set_master(pdev);
5523
5524 if ((sizeof(dma_addr_t) == 4) ||
5525 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5526 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5527
5528 if (rc == 0)
5529 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5530
5531 if (rc != 0) {
5532 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5533 goto disable_device;
5534 }
5535
5536 pmcraid_disable_interrupts(pinstance, ~0);
5537 atomic_set(&pinstance->outstanding_cmds, 0);
5538 rc = pmcraid_register_interrupt_handler(pinstance);
5539
5540 if (rc) {
5541 dev_err(&pdev->dev,
5542 "resume: couldn't register interrupt handlers\n");
5543 rc = -ENODEV;
5544 goto release_host;
5545 }
5546
5547 pmcraid_init_tasklets(pinstance);
5548 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5549
5550 /* Start with hard reset sequence which brings up IOA to operational
5551 * state as well as completes the reset sequence.
5552 */
5553 pinstance->ioa_hard_reset = 1;
5554
5555 /* Start IOA firmware initialization and bring card to Operational
5556 * state.
5557 */
5558 if (pmcraid_reset_bringup(pinstance)) {
5559 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5560 rc = -ENODEV;
5561 goto release_tasklets;
5562 }
5563
5564 return 0;
5565
5566release_tasklets:
5567 pmcraid_disable_interrupts(pinstance, ~0);
5568 pmcraid_kill_tasklets(pinstance);
5569 pmcraid_unregister_interrupt_handler(pinstance);
5570
5571release_host:
5572 scsi_host_put(host);
5573
5574disable_device:
5575 pci_disable_device(pdev);
5576
5577 return rc;
5578}
5579
5580#else
5581
5582#define pmcraid_suspend NULL
5583#define pmcraid_resume NULL
5584
5585#endif /* CONFIG_PM */
5586
5587/**
5588 * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5589 * completion of the ioa reset
5590 * @cmd: pointer to reset command block
5591 */
5592static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5593{
5594 struct pmcraid_instance *pinstance = cmd->drv_inst;
5595 unsigned long flags;
5596
5597 spin_lock_irqsave(pinstance->host->host_lock, flags);
5598 pmcraid_ioa_reset(cmd);
5599 spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5600 scsi_unblock_requests(pinstance->host);
5601 schedule_work(&pinstance->worker_q);
5602}
5603
5604/**
5605 * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5606 *
5607 * @cmd: pointer to pmcraid_cmd structure
5608 *
5609 * Return Value
5610 * 0 for success or non-zero for failure cases
5611 */
5612static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5613{
5614 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5615 void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5616
5617 pmcraid_reinit_cmdblk(cmd);
5618
5619 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5620 ioarcb->request_type = REQ_TYPE_IOACMD;
5621 ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5622 ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5623
5624 /* If this was called as part of resource table reinitialization due to
5625 * lost CCN, it is enough to return the command block back to free pool
5626 * as part of set_supported_devs completion function.
5627 */
5628 if (cmd->drv_inst->reinit_cfg_table) {
5629 cmd->drv_inst->reinit_cfg_table = 0;
5630 cmd->release = 1;
5631 cmd_done = pmcraid_reinit_cfgtable_done;
5632 }
5633
5634 /* we will be done with the reset sequence after set supported devices,
5635 * setup the done function to return the command block back to free
5636 * pool
5637 */
5638 pmcraid_send_cmd(cmd,
5639 cmd_done,
5640 PMCRAID_SET_SUP_DEV_TIMEOUT,
5641 pmcraid_timeout_handler);
5642 return;
5643}
5644
5645/**
5646 * pmcraid_set_timestamp - set the timestamp to IOAFP
5647 *
5648 * @cmd: pointer to pmcraid_cmd structure
5649 *
5650 * Return Value
5651 * 0 for success or non-zero for failure cases
5652 */
5653static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5654{
5655 struct pmcraid_instance *pinstance = cmd->drv_inst;
5656 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5657 __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5658 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5659
5660 struct timeval tv;
5661 __le64 timestamp;
5662
5663 do_gettimeofday(&tv);
5664 timestamp = tv.tv_sec * 1000;
5665
5666 pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5667 pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5668 pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5669 pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5670 pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5671 pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp) >> 40);
5672
5673 pmcraid_reinit_cmdblk(cmd);
5674 ioarcb->request_type = REQ_TYPE_SCSI;
5675 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5676 ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5677 ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5678 memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5679
5680 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5681 offsetof(struct pmcraid_ioarcb,
5682 add_data.u.ioadl[0]));
5683 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5684 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5685
5686 ioarcb->request_flags0 |= NO_LINK_DESCS;
5687 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5688 ioarcb->data_transfer_length =
5689 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5690 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5691 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5692 ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5693 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5694
5695 if (!pinstance->timestamp_error) {
5696 pinstance->timestamp_error = 0;
5697 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5698 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5699 } else {
5700 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5701 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5702 return;
5703 }
5704}
5705
5706
5707/**
5708 * pmcraid_init_res_table - Initialize the resource table
5709 * @cmd: pointer to pmcraid command struct
5710 *
5711 * This function looks through the existing resource table, comparing
5712 * it with the config table. This function will take care of old/new
5713 * devices and schedule adding/removing them from the mid-layer
5714 * as appropriate.
5715 *
5716 * Return value
5717 * None
5718 */
5719static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5720{
5721 struct pmcraid_instance *pinstance = cmd->drv_inst;
5722 struct pmcraid_resource_entry *res, *temp;
5723 struct pmcraid_config_table_entry *cfgte;
5724 unsigned long lock_flags;
5725 int found, rc, i;
5726 u16 fw_version;
5727 LIST_HEAD(old_res);
5728
5729 if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5730 pmcraid_err("IOA requires microcode download\n");
5731
5732 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5733
5734 /* resource list is protected by pinstance->resource_lock.
5735 * init_res_table can be called from probe (user-thread) or runtime
5736 * reset (timer/tasklet)
5737 */
5738 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5739
5740 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5741 list_move_tail(&res->queue, &old_res);
5742
5743 for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
5744 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5745 PMCRAID_FW_VERSION_1)
5746 cfgte = &pinstance->cfg_table->entries[i];
5747 else
5748 cfgte = (struct pmcraid_config_table_entry *)
5749 &pinstance->cfg_table->entries_ext[i];
5750
5751 if (!pmcraid_expose_resource(fw_version, cfgte))
5752 continue;
5753
5754 found = 0;
5755
5756 /* If this entry was already detected and initialized */
5757 list_for_each_entry_safe(res, temp, &old_res, queue) {
5758
5759 rc = memcmp(&res->cfg_entry.resource_address,
5760 &cfgte->resource_address,
5761 sizeof(cfgte->resource_address));
5762 if (!rc) {
5763 list_move_tail(&res->queue,
5764 &pinstance->used_res_q);
5765 found = 1;
5766 break;
5767 }
5768 }
5769
5770 /* If this is new entry, initialize it and add it the queue */
5771 if (!found) {
5772
5773 if (list_empty(&pinstance->free_res_q)) {
5774 pmcraid_err("Too many devices attached\n");
5775 break;
5776 }
5777
5778 found = 1;
5779 res = list_entry(pinstance->free_res_q.next,
5780 struct pmcraid_resource_entry, queue);
5781
5782 res->scsi_dev = NULL;
5783 res->change_detected = RES_CHANGE_ADD;
5784 res->reset_progress = 0;
5785 list_move_tail(&res->queue, &pinstance->used_res_q);
5786 }
5787
5788 /* copy new configuration table entry details into driver
5789 * maintained resource entry
5790 */
5791 if (found) {
5792 memcpy(&res->cfg_entry, cfgte,
5793 pinstance->config_table_entry_size);
5794 pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5795 res->cfg_entry.resource_type,
5796 (fw_version <= PMCRAID_FW_VERSION_1 ?
5797 res->cfg_entry.unique_flags1 :
5798 res->cfg_entry.array_id & 0xFF),
5799 le32_to_cpu(res->cfg_entry.resource_address));
5800 }
5801 }
5802
5803 /* Detect any deleted entries, mark them for deletion from mid-layer */
5804 list_for_each_entry_safe(res, temp, &old_res, queue) {
5805
5806 if (res->scsi_dev) {
5807 res->change_detected = RES_CHANGE_DEL;
5808 res->cfg_entry.resource_handle =
5809 PMCRAID_INVALID_RES_HANDLE;
5810 list_move_tail(&res->queue, &pinstance->used_res_q);
5811 } else {
5812 list_move_tail(&res->queue, &pinstance->free_res_q);
5813 }
5814 }
5815
5816 /* release the resource list lock */
5817 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5818 pmcraid_set_timestamp(cmd);
5819}
5820
5821/**
5822 * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5823 * @cmd: pointer pmcraid_cmd struct
5824 *
5825 * This function sends a Query IOA Configuration command to the adapter to
5826 * retrieve the IOA configuration table.
5827 *
5828 * Return value:
5829 * none
5830 */
5831static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5832{
5833 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5834 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5835 struct pmcraid_instance *pinstance = cmd->drv_inst;
5836 int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5837
5838 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5839 PMCRAID_FW_VERSION_1)
5840 pinstance->config_table_entry_size =
5841 sizeof(struct pmcraid_config_table_entry);
5842 else
5843 pinstance->config_table_entry_size =
5844 sizeof(struct pmcraid_config_table_entry_ext);
5845
5846 ioarcb->request_type = REQ_TYPE_IOACMD;
5847 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5848
5849 ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5850
5851 /* firmware requires 4-byte length field, specified in B.E format */
5852 memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5853
5854 /* Since entire config table can be described by single IOADL, it can
5855 * be part of IOARCB itself
5856 */
5857 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5858 offsetof(struct pmcraid_ioarcb,
5859 add_data.u.ioadl[0]));
5860 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5861 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5862
5863 ioarcb->request_flags0 |= NO_LINK_DESCS;
5864 ioarcb->data_transfer_length =
5865 cpu_to_le32(sizeof(struct pmcraid_config_table));
5866
5867 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5868 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5869 ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5870 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5871
5872 pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5873 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5874}
5875
5876
5877/**
5878 * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5879 * @pdev: pointer to pci device structure
5880 * @dev_id: pointer to device ids structure
5881 *
5882 * Return Value
5883 * returns 0 if the device is claimed and successfully configured.
5884 * returns non-zero error code in case of any failure
5885 */
5886static int __devinit pmcraid_probe(
5887 struct pci_dev *pdev,
5888 const struct pci_device_id *dev_id
5889)
5890{
5891 struct pmcraid_instance *pinstance;
5892 struct Scsi_Host *host;
5893 void __iomem *mapped_pci_addr;
5894 int rc = PCIBIOS_SUCCESSFUL;
5895
5896 if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5897 pmcraid_err
5898 ("maximum number(%d) of supported adapters reached\n",
5899 atomic_read(&pmcraid_adapter_count));
5900 return -ENOMEM;
5901 }
5902
5903 atomic_inc(&pmcraid_adapter_count);
5904 rc = pci_enable_device(pdev);
5905
5906 if (rc) {
5907 dev_err(&pdev->dev, "Cannot enable adapter\n");
5908 atomic_dec(&pmcraid_adapter_count);
5909 return rc;
5910 }
5911
5912 dev_info(&pdev->dev,
5913 "Found new IOA(%x:%x), Total IOA count: %d\n",
5914 pdev->vendor, pdev->device,
5915 atomic_read(&pmcraid_adapter_count));
5916
5917 rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5918
5919 if (rc < 0) {
5920 dev_err(&pdev->dev,
5921 "Couldn't register memory range of registers\n");
5922 goto out_disable_device;
5923 }
5924
5925 mapped_pci_addr = pci_iomap(pdev, 0, 0);
5926
5927 if (!mapped_pci_addr) {
5928 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5929 rc = -ENOMEM;
5930 goto out_release_regions;
5931 }
5932
5933 pci_set_master(pdev);
5934
5935 /* Firmware requires the system bus address of IOARCB to be within
5936 * 32-bit addressable range though it has 64-bit IOARRIN register.
5937 * However, firmware supports 64-bit streaming DMA buffers, whereas
5938 * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
5939 * returns memory within 4GB (if not, change this logic), coherent
5940 * buffers are within firmware acceptable address ranges.
5941 */
5942 if ((sizeof(dma_addr_t) == 4) ||
5943 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5944 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5945
5946 /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5947 * bit mask for pci_alloc_consistent to return addresses within 4GB
5948 */
5949 if (rc == 0)
5950 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5951
5952 if (rc != 0) {
5953 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5954 goto cleanup_nomem;
5955 }
5956
5957 host = scsi_host_alloc(&pmcraid_host_template,
5958 sizeof(struct pmcraid_instance));
5959
5960 if (!host) {
5961 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5962 rc = -ENOMEM;
5963 goto cleanup_nomem;
5964 }
5965
5966 host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5967 host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5968 host->unique_id = host->host_no;
5969 host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5970 host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5971
5972 /* zero out entire instance structure */
5973 pinstance = (struct pmcraid_instance *)host->hostdata;
5974 memset(pinstance, 0, sizeof(*pinstance));
5975
5976 pinstance->chip_cfg =
5977 (struct pmcraid_chip_details *)(dev_id->driver_data);
5978
5979 rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5980
5981 if (rc < 0) {
5982 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5983 goto out_scsi_host_put;
5984 }
5985
5986 pci_set_drvdata(pdev, pinstance);
5987
5988 /* Save PCI config-space for use following the reset */
5989 rc = pci_save_state(pinstance->pdev);
5990
5991 if (rc != 0) {
5992 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5993 goto out_scsi_host_put;
5994 }
5995
5996 pmcraid_disable_interrupts(pinstance, ~0);
5997
5998 rc = pmcraid_register_interrupt_handler(pinstance);
5999
6000 if (rc) {
6001 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
6002 goto out_scsi_host_put;
6003 }
6004
6005 pmcraid_init_tasklets(pinstance);
6006
6007 /* allocate verious buffers used by LLD.*/
6008 rc = pmcraid_init_buffers(pinstance);
6009
6010 if (rc) {
6011 pmcraid_err("couldn't allocate memory blocks\n");
6012 goto out_unregister_isr;
6013 }
6014
6015 /* check the reset type required */
6016 pmcraid_reset_type(pinstance);
6017
6018 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
6019
6020 /* Start IOA firmware initialization and bring card to Operational
6021 * state.
6022 */
6023 pmcraid_info("starting IOA initialization sequence\n");
6024 if (pmcraid_reset_bringup(pinstance)) {
6025 dev_err(&pdev->dev, "couldn't initialize IOA\n");
6026 rc = 1;
6027 goto out_release_bufs;
6028 }
6029
6030 /* Add adapter instance into mid-layer list */
6031 rc = scsi_add_host(pinstance->host, &pdev->dev);
6032 if (rc != 0) {
6033 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
6034 goto out_release_bufs;
6035 }
6036
6037 scsi_scan_host(pinstance->host);
6038
6039 rc = pmcraid_setup_chrdev(pinstance);
6040
6041 if (rc != 0) {
6042 pmcraid_err("couldn't create mgmt interface, error: %x\n",
6043 rc);
6044 goto out_remove_host;
6045 }
6046
6047 /* Schedule worker thread to handle CCN and take care of adding and
6048 * removing devices to OS
6049 */
6050 atomic_set(&pinstance->expose_resources, 1);
6051 schedule_work(&pinstance->worker_q);
6052 return rc;
6053
6054out_remove_host:
6055 scsi_remove_host(host);
6056
6057out_release_bufs:
6058 pmcraid_release_buffers(pinstance);
6059
6060out_unregister_isr:
6061 pmcraid_kill_tasklets(pinstance);
6062 pmcraid_unregister_interrupt_handler(pinstance);
6063
6064out_scsi_host_put:
6065 scsi_host_put(host);
6066
6067cleanup_nomem:
6068 iounmap(mapped_pci_addr);
6069
6070out_release_regions:
6071 pci_release_regions(pdev);
6072
6073out_disable_device:
6074 atomic_dec(&pmcraid_adapter_count);
6075 pci_set_drvdata(pdev, NULL);
6076 pci_disable_device(pdev);
6077 return -ENODEV;
6078}
6079
6080/*
6081 * PCI driver structure of pcmraid driver
6082 */
6083static struct pci_driver pmcraid_driver = {
6084 .name = PMCRAID_DRIVER_NAME,
6085 .id_table = pmcraid_pci_table,
6086 .probe = pmcraid_probe,
6087 .remove = pmcraid_remove,
6088 .suspend = pmcraid_suspend,
6089 .resume = pmcraid_resume,
6090 .shutdown = pmcraid_shutdown
6091};
6092
6093/**
6094 * pmcraid_init - module load entry point
6095 */
6096static int __init pmcraid_init(void)
6097{
6098 dev_t dev;
6099 int error;
6100
6101 pmcraid_info("%s Device Driver version: %s\n",
6102 PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
6103
6104 error = alloc_chrdev_region(&dev, 0,
6105 PMCRAID_MAX_ADAPTERS,
6106 PMCRAID_DEVFILE);
6107
6108 if (error) {
6109 pmcraid_err("failed to get a major number for adapters\n");
6110 goto out_init;
6111 }
6112
6113 pmcraid_major = MAJOR(dev);
6114 pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
6115
6116 if (IS_ERR(pmcraid_class)) {
6117 error = PTR_ERR(pmcraid_class);
6118 pmcraid_err("failed to register with with sysfs, error = %x\n",
6119 error);
6120 goto out_unreg_chrdev;
6121 }
6122
6123 error = pmcraid_netlink_init();
6124
6125 if (error)
6126 goto out_unreg_chrdev;
6127
6128 error = pci_register_driver(&pmcraid_driver);
6129
6130 if (error == 0)
6131 goto out_init;
6132
6133 pmcraid_err("failed to register pmcraid driver, error = %x\n",
6134 error);
6135 class_destroy(pmcraid_class);
6136 pmcraid_netlink_release();
6137
6138out_unreg_chrdev:
6139 unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
6140
6141out_init:
6142 return error;
6143}
6144
6145/**
6146 * pmcraid_exit - module unload entry point
6147 */
6148static void __exit pmcraid_exit(void)
6149{
6150 pmcraid_netlink_release();
6151 unregister_chrdev_region(MKDEV(pmcraid_major, 0),
6152 PMCRAID_MAX_ADAPTERS);
6153 pci_unregister_driver(&pmcraid_driver);
6154 class_destroy(pmcraid_class);
6155}
6156
6157module_init(pmcraid_init);
6158module_exit(pmcraid_exit);