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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 <linux/ktime.h>
49#include <scsi/scsi.h>
50#include <scsi/scsi_host.h>
51#include <scsi/scsi_device.h>
52#include <scsi/scsi_tcq.h>
53#include <scsi/scsi_eh.h>
54#include <scsi/scsi_cmnd.h>
55#include <scsi/scsicam.h>
56
57#include "pmcraid.h"
58
59/*
60 * Module configuration parameters
61 */
62static unsigned int pmcraid_debug_log;
63static unsigned int pmcraid_disable_aen;
64static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
65static unsigned int pmcraid_enable_msix;
66
67/*
68 * Data structures to support multiple adapters by the LLD.
69 * pmcraid_adapter_count - count of configured adapters
70 */
71static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
72
73/*
74 * Supporting user-level control interface through IOCTL commands.
75 * pmcraid_major - major number to use
76 * pmcraid_minor - minor number(s) to use
77 */
78static unsigned int pmcraid_major;
79static struct class *pmcraid_class;
80DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
81
82/*
83 * Module parameters
84 */
85MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
86MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
87MODULE_LICENSE("GPL");
88MODULE_VERSION(PMCRAID_DRIVER_VERSION);
89
90module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
91MODULE_PARM_DESC(log_level,
92 "Enables firmware error code logging, default :1 high-severity"
93 " errors, 2: all errors including high-severity errors,"
94 " 0: disables logging");
95
96module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
97MODULE_PARM_DESC(debug,
98 "Enable driver verbose message logging. Set 1 to enable."
99 "(default: 0)");
100
101module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
102MODULE_PARM_DESC(disable_aen,
103 "Disable driver aen notifications to apps. Set 1 to disable."
104 "(default: 0)");
105
106/* chip specific constants for PMC MaxRAID controllers (same for
107 * 0x5220 and 0x8010
108 */
109static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
110 {
111 .ioastatus = 0x0,
112 .ioarrin = 0x00040,
113 .mailbox = 0x7FC30,
114 .global_intr_mask = 0x00034,
115 .ioa_host_intr = 0x0009C,
116 .ioa_host_intr_clr = 0x000A0,
117 .ioa_host_msix_intr = 0x7FC40,
118 .ioa_host_mask = 0x7FC28,
119 .ioa_host_mask_clr = 0x7FC28,
120 .host_ioa_intr = 0x00020,
121 .host_ioa_intr_clr = 0x00020,
122 .transop_timeout = 300
123 }
124};
125
126/*
127 * PCI device ids supported by pmcraid driver
128 */
129static struct pci_device_id pmcraid_pci_table[] = {
130 { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
131 0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
132 },
133 {}
134};
135
136MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
137
138
139
140/**
141 * pmcraid_slave_alloc - Prepare for commands to a device
142 * @scsi_dev: scsi device struct
143 *
144 * This function is called by mid-layer prior to sending any command to the new
145 * device. Stores resource entry details of the device in scsi_device struct.
146 * Queuecommand uses the resource handle and other details to fill up IOARCB
147 * while sending commands to the device.
148 *
149 * Return value:
150 * 0 on success / -ENXIO if device does not exist
151 */
152static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
153{
154 struct pmcraid_resource_entry *temp, *res = NULL;
155 struct pmcraid_instance *pinstance;
156 u8 target, bus, lun;
157 unsigned long lock_flags;
158 int rc = -ENXIO;
159 u16 fw_version;
160
161 pinstance = shost_priv(scsi_dev->host);
162
163 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
164
165 /* Driver exposes VSET and GSCSI resources only; all other device types
166 * are not exposed. Resource list is synchronized using resource lock
167 * so any traversal or modifications to the list should be done inside
168 * this lock
169 */
170 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
171 list_for_each_entry(temp, &pinstance->used_res_q, queue) {
172
173 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
174 if (RES_IS_VSET(temp->cfg_entry)) {
175 if (fw_version <= PMCRAID_FW_VERSION_1)
176 target = temp->cfg_entry.unique_flags1;
177 else
178 target = temp->cfg_entry.array_id & 0xFF;
179
180 if (target > PMCRAID_MAX_VSET_TARGETS)
181 continue;
182 bus = PMCRAID_VSET_BUS_ID;
183 lun = 0;
184 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
185 target = RES_TARGET(temp->cfg_entry.resource_address);
186 bus = PMCRAID_PHYS_BUS_ID;
187 lun = RES_LUN(temp->cfg_entry.resource_address);
188 } else {
189 continue;
190 }
191
192 if (bus == scsi_dev->channel &&
193 target == scsi_dev->id &&
194 lun == scsi_dev->lun) {
195 res = temp;
196 break;
197 }
198 }
199
200 if (res) {
201 res->scsi_dev = scsi_dev;
202 scsi_dev->hostdata = res;
203 res->change_detected = 0;
204 atomic_set(&res->read_failures, 0);
205 atomic_set(&res->write_failures, 0);
206 rc = 0;
207 }
208 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
209 return rc;
210}
211
212/**
213 * pmcraid_slave_configure - Configures a SCSI device
214 * @scsi_dev: scsi device struct
215 *
216 * This function is executed by SCSI mid layer just after a device is first
217 * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
218 * timeout value (default 30s) will be over-written to a higher value (60s)
219 * and max_sectors value will be over-written to 512. It also sets queue depth
220 * to host->cmd_per_lun value
221 *
222 * Return value:
223 * 0 on success
224 */
225static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
226{
227 struct pmcraid_resource_entry *res = scsi_dev->hostdata;
228
229 if (!res)
230 return 0;
231
232 /* LLD exposes VSETs and Enclosure devices only */
233 if (RES_IS_GSCSI(res->cfg_entry) &&
234 scsi_dev->type != TYPE_ENCLOSURE)
235 return -ENXIO;
236
237 pmcraid_info("configuring %x:%x:%x:%x\n",
238 scsi_dev->host->unique_id,
239 scsi_dev->channel,
240 scsi_dev->id,
241 (u8)scsi_dev->lun);
242
243 if (RES_IS_GSCSI(res->cfg_entry)) {
244 scsi_dev->allow_restart = 1;
245 } else if (RES_IS_VSET(res->cfg_entry)) {
246 scsi_dev->allow_restart = 1;
247 blk_queue_rq_timeout(scsi_dev->request_queue,
248 PMCRAID_VSET_IO_TIMEOUT);
249 blk_queue_max_hw_sectors(scsi_dev->request_queue,
250 PMCRAID_VSET_MAX_SECTORS);
251 }
252
253 /*
254 * We never want to report TCQ support for these types of devices.
255 */
256 if (!RES_IS_GSCSI(res->cfg_entry) && !RES_IS_VSET(res->cfg_entry))
257 scsi_dev->tagged_supported = 0;
258
259 return 0;
260}
261
262/**
263 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
264 *
265 * @scsi_dev: scsi device struct
266 *
267 * This is called by mid-layer before removing a device. Pointer assignments
268 * done in pmcraid_slave_alloc will be reset to NULL here.
269 *
270 * Return value
271 * none
272 */
273static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
274{
275 struct pmcraid_resource_entry *res;
276
277 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
278
279 if (res)
280 res->scsi_dev = NULL;
281
282 scsi_dev->hostdata = NULL;
283}
284
285/**
286 * pmcraid_change_queue_depth - Change the device's queue depth
287 * @scsi_dev: scsi device struct
288 * @depth: depth to set
289 *
290 * Return value
291 * actual depth set
292 */
293static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth)
294{
295 if (depth > PMCRAID_MAX_CMD_PER_LUN)
296 depth = PMCRAID_MAX_CMD_PER_LUN;
297 return scsi_change_queue_depth(scsi_dev, depth);
298}
299
300/**
301 * pmcraid_init_cmdblk - initializes a command block
302 *
303 * @cmd: pointer to struct pmcraid_cmd to be initialized
304 * @index: if >=0 first time initialization; otherwise reinitialization
305 *
306 * Return Value
307 * None
308 */
309static void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
310{
311 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
312 dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
313
314 if (index >= 0) {
315 /* first time initialization (called from probe) */
316 u32 ioasa_offset =
317 offsetof(struct pmcraid_control_block, ioasa);
318
319 cmd->index = index;
320 ioarcb->response_handle = cpu_to_le32(index << 2);
321 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
322 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
323 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
324 } else {
325 /* re-initialization of various lengths, called once command is
326 * processed by IOA
327 */
328 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
329 ioarcb->hrrq_id = 0;
330 ioarcb->request_flags0 = 0;
331 ioarcb->request_flags1 = 0;
332 ioarcb->cmd_timeout = 0;
333 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
334 ioarcb->ioadl_bus_addr = 0;
335 ioarcb->ioadl_length = 0;
336 ioarcb->data_transfer_length = 0;
337 ioarcb->add_cmd_param_length = 0;
338 ioarcb->add_cmd_param_offset = 0;
339 cmd->ioa_cb->ioasa.ioasc = 0;
340 cmd->ioa_cb->ioasa.residual_data_length = 0;
341 cmd->time_left = 0;
342 }
343
344 cmd->cmd_done = NULL;
345 cmd->scsi_cmd = NULL;
346 cmd->release = 0;
347 cmd->completion_req = 0;
348 cmd->sense_buffer = 0;
349 cmd->sense_buffer_dma = 0;
350 cmd->dma_handle = 0;
351 init_timer(&cmd->timer);
352}
353
354/**
355 * pmcraid_reinit_cmdblk - reinitialize a command block
356 *
357 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
358 *
359 * Return Value
360 * None
361 */
362static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
363{
364 pmcraid_init_cmdblk(cmd, -1);
365}
366
367/**
368 * pmcraid_get_free_cmd - get a free cmd block from command block pool
369 * @pinstance: adapter instance structure
370 *
371 * Return Value:
372 * returns pointer to cmd block or NULL if no blocks are available
373 */
374static struct pmcraid_cmd *pmcraid_get_free_cmd(
375 struct pmcraid_instance *pinstance
376)
377{
378 struct pmcraid_cmd *cmd = NULL;
379 unsigned long lock_flags;
380
381 /* free cmd block list is protected by free_pool_lock */
382 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
383
384 if (!list_empty(&pinstance->free_cmd_pool)) {
385 cmd = list_entry(pinstance->free_cmd_pool.next,
386 struct pmcraid_cmd, free_list);
387 list_del(&cmd->free_list);
388 }
389 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
390
391 /* Initialize the command block before giving it the caller */
392 if (cmd != NULL)
393 pmcraid_reinit_cmdblk(cmd);
394 return cmd;
395}
396
397/**
398 * pmcraid_return_cmd - return a completed command block back into free pool
399 * @cmd: pointer to the command block
400 *
401 * Return Value:
402 * nothing
403 */
404static void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
405{
406 struct pmcraid_instance *pinstance = cmd->drv_inst;
407 unsigned long lock_flags;
408
409 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
410 list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
411 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
412}
413
414/**
415 * pmcraid_read_interrupts - reads IOA interrupts
416 *
417 * @pinstance: pointer to adapter instance structure
418 *
419 * Return value
420 * interrupts read from IOA
421 */
422static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
423{
424 return (pinstance->interrupt_mode) ?
425 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
426 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
427}
428
429/**
430 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
431 *
432 * @pinstance: pointer to per adapter instance structure
433 * @intrs: interrupts to disable
434 *
435 * Return Value
436 * None
437 */
438static void pmcraid_disable_interrupts(
439 struct pmcraid_instance *pinstance,
440 u32 intrs
441)
442{
443 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
444 u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
445
446 iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
447 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
448 ioread32(pinstance->int_regs.global_interrupt_mask_reg);
449
450 if (!pinstance->interrupt_mode) {
451 iowrite32(intrs,
452 pinstance->int_regs.ioa_host_interrupt_mask_reg);
453 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
454 }
455}
456
457/**
458 * pmcraid_enable_interrupts - Enables specified interrupts
459 *
460 * @pinstance: pointer to per adapter instance structure
461 * @intr: interrupts to enable
462 *
463 * Return Value
464 * None
465 */
466static void pmcraid_enable_interrupts(
467 struct pmcraid_instance *pinstance,
468 u32 intrs
469)
470{
471 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
472 u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
473
474 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
475
476 if (!pinstance->interrupt_mode) {
477 iowrite32(~intrs,
478 pinstance->int_regs.ioa_host_interrupt_mask_reg);
479 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
480 }
481
482 pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
483 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
484 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
485}
486
487/**
488 * pmcraid_clr_trans_op - clear trans to op interrupt
489 *
490 * @pinstance: pointer to per adapter instance structure
491 *
492 * Return Value
493 * None
494 */
495static void pmcraid_clr_trans_op(
496 struct pmcraid_instance *pinstance
497)
498{
499 unsigned long lock_flags;
500
501 if (!pinstance->interrupt_mode) {
502 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
503 pinstance->int_regs.ioa_host_interrupt_mask_reg);
504 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
505 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
506 pinstance->int_regs.ioa_host_interrupt_clr_reg);
507 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
508 }
509
510 if (pinstance->reset_cmd != NULL) {
511 del_timer(&pinstance->reset_cmd->timer);
512 spin_lock_irqsave(
513 pinstance->host->host_lock, lock_flags);
514 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
515 spin_unlock_irqrestore(
516 pinstance->host->host_lock, lock_flags);
517 }
518}
519
520/**
521 * pmcraid_reset_type - Determine the required reset type
522 * @pinstance: pointer to adapter instance structure
523 *
524 * IOA requires hard reset if any of the following conditions is true.
525 * 1. If HRRQ valid interrupt is not masked
526 * 2. IOA reset alert doorbell is set
527 * 3. If there are any error interrupts
528 */
529static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
530{
531 u32 mask;
532 u32 intrs;
533 u32 alerts;
534
535 mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
536 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
537 alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
538
539 if ((mask & INTRS_HRRQ_VALID) == 0 ||
540 (alerts & DOORBELL_IOA_RESET_ALERT) ||
541 (intrs & PMCRAID_ERROR_INTERRUPTS)) {
542 pmcraid_info("IOA requires hard reset\n");
543 pinstance->ioa_hard_reset = 1;
544 }
545
546 /* If unit check is active, trigger the dump */
547 if (intrs & INTRS_IOA_UNIT_CHECK)
548 pinstance->ioa_unit_check = 1;
549}
550
551/**
552 * pmcraid_bist_done - completion function for PCI BIST
553 * @cmd: pointer to reset command
554 * Return Value
555 * none
556 */
557
558static void pmcraid_ioa_reset(struct pmcraid_cmd *);
559
560static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
561{
562 struct pmcraid_instance *pinstance = cmd->drv_inst;
563 unsigned long lock_flags;
564 int rc;
565 u16 pci_reg;
566
567 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
568
569 /* If PCI config space can't be accessed wait for another two secs */
570 if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
571 cmd->time_left > 0) {
572 pmcraid_info("BIST not complete, waiting another 2 secs\n");
573 cmd->timer.expires = jiffies + cmd->time_left;
574 cmd->time_left = 0;
575 cmd->timer.data = (unsigned long)cmd;
576 cmd->timer.function =
577 (void (*)(unsigned long))pmcraid_bist_done;
578 add_timer(&cmd->timer);
579 } else {
580 cmd->time_left = 0;
581 pmcraid_info("BIST is complete, proceeding with reset\n");
582 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
583 pmcraid_ioa_reset(cmd);
584 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
585 }
586}
587
588/**
589 * pmcraid_start_bist - starts BIST
590 * @cmd: pointer to reset cmd
591 * Return Value
592 * none
593 */
594static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
595{
596 struct pmcraid_instance *pinstance = cmd->drv_inst;
597 u32 doorbells, intrs;
598
599 /* proceed with bist and wait for 2 seconds */
600 iowrite32(DOORBELL_IOA_START_BIST,
601 pinstance->int_regs.host_ioa_interrupt_reg);
602 doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
603 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
604 pmcraid_info("doorbells after start bist: %x intrs: %x\n",
605 doorbells, intrs);
606
607 cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
608 cmd->timer.data = (unsigned long)cmd;
609 cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
610 cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
611 add_timer(&cmd->timer);
612}
613
614/**
615 * pmcraid_reset_alert_done - completion routine for reset_alert
616 * @cmd: pointer to command block used in reset sequence
617 * Return value
618 * None
619 */
620static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
621{
622 struct pmcraid_instance *pinstance = cmd->drv_inst;
623 u32 status = ioread32(pinstance->ioa_status);
624 unsigned long lock_flags;
625
626 /* if the critical operation in progress bit is set or the wait times
627 * out, invoke reset engine to proceed with hard reset. If there is
628 * some more time to wait, restart the timer
629 */
630 if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
631 cmd->time_left <= 0) {
632 pmcraid_info("critical op is reset proceeding with reset\n");
633 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
634 pmcraid_ioa_reset(cmd);
635 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
636 } else {
637 pmcraid_info("critical op is not yet reset waiting again\n");
638 /* restart timer if some more time is available to wait */
639 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
640 cmd->timer.data = (unsigned long)cmd;
641 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
642 cmd->timer.function =
643 (void (*)(unsigned long))pmcraid_reset_alert_done;
644 add_timer(&cmd->timer);
645 }
646}
647
648/**
649 * pmcraid_reset_alert - alerts IOA for a possible reset
650 * @cmd : command block to be used for reset sequence.
651 *
652 * Return Value
653 * returns 0 if pci config-space is accessible and RESET_DOORBELL is
654 * successfully written to IOA. Returns non-zero in case pci_config_space
655 * is not accessible
656 */
657static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
658static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
659{
660 struct pmcraid_instance *pinstance = cmd->drv_inst;
661 u32 doorbells;
662 int rc;
663 u16 pci_reg;
664
665 /* If we are able to access IOA PCI config space, alert IOA that we are
666 * going to reset it soon. This enables IOA to preserv persistent error
667 * data if any. In case memory space is not accessible, proceed with
668 * BIST or slot_reset
669 */
670 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
671 if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
672
673 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
674 * reset IOA doesn't generate any interrupts when CRITICAL
675 * OPERATION bit is reset. A timer is started to wait for this
676 * bit to be reset.
677 */
678 cmd->time_left = PMCRAID_RESET_TIMEOUT;
679 cmd->timer.data = (unsigned long)cmd;
680 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
681 cmd->timer.function =
682 (void (*)(unsigned long))pmcraid_reset_alert_done;
683 add_timer(&cmd->timer);
684
685 iowrite32(DOORBELL_IOA_RESET_ALERT,
686 pinstance->int_regs.host_ioa_interrupt_reg);
687 doorbells =
688 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
689 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
690 } else {
691 pmcraid_info("PCI config is not accessible starting BIST\n");
692 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
693 pmcraid_start_bist(cmd);
694 }
695}
696
697/**
698 * pmcraid_timeout_handler - Timeout handler for internally generated ops
699 *
700 * @cmd : pointer to command structure, that got timedout
701 *
702 * This function blocks host requests and initiates an adapter reset.
703 *
704 * Return value:
705 * None
706 */
707static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
708{
709 struct pmcraid_instance *pinstance = cmd->drv_inst;
710 unsigned long lock_flags;
711
712 dev_info(&pinstance->pdev->dev,
713 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
714 cmd->ioa_cb->ioarcb.cdb[0]);
715
716 /* Command timeouts result in hard reset sequence. The command that got
717 * timed out may be the one used as part of reset sequence. In this
718 * case restart reset sequence using the same command block even if
719 * reset is in progress. Otherwise fail this command and get a free
720 * command block to restart the reset sequence.
721 */
722 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
723 if (!pinstance->ioa_reset_in_progress) {
724 pinstance->ioa_reset_attempts = 0;
725 cmd = pmcraid_get_free_cmd(pinstance);
726
727 /* If we are out of command blocks, just return here itself.
728 * Some other command's timeout handler can do the reset job
729 */
730 if (cmd == NULL) {
731 spin_unlock_irqrestore(pinstance->host->host_lock,
732 lock_flags);
733 pmcraid_err("no free cmnd block for timeout handler\n");
734 return;
735 }
736
737 pinstance->reset_cmd = cmd;
738 pinstance->ioa_reset_in_progress = 1;
739 } else {
740 pmcraid_info("reset is already in progress\n");
741
742 if (pinstance->reset_cmd != cmd) {
743 /* This command should have been given to IOA, this
744 * command will be completed by fail_outstanding_cmds
745 * anyway
746 */
747 pmcraid_err("cmd is pending but reset in progress\n");
748 }
749
750 /* If this command was being used as part of the reset
751 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
752 * causes fail_outstanding_commands not to return the command
753 * block back to free pool
754 */
755 if (cmd == pinstance->reset_cmd)
756 cmd->cmd_done = pmcraid_ioa_reset;
757 }
758
759 /* Notify apps of important IOA bringup/bringdown sequences */
760 if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
761 pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
762 pmcraid_notify_ioastate(pinstance,
763 PMC_DEVICE_EVENT_RESET_START);
764
765 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
766 scsi_block_requests(pinstance->host);
767 pmcraid_reset_alert(cmd);
768 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
769}
770
771/**
772 * pmcraid_internal_done - completion routine for internally generated cmds
773 *
774 * @cmd: command that got response from IOA
775 *
776 * Return Value:
777 * none
778 */
779static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
780{
781 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
782 cmd->ioa_cb->ioarcb.cdb[0],
783 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
784
785 /* Some of the internal commands are sent with callers blocking for the
786 * response. Same will be indicated as part of cmd->completion_req
787 * field. Response path needs to wake up any waiters waiting for cmd
788 * completion if this flag is set.
789 */
790 if (cmd->completion_req) {
791 cmd->completion_req = 0;
792 complete(&cmd->wait_for_completion);
793 }
794
795 /* most of the internal commands are completed by caller itself, so
796 * no need to return the command block back to free pool until we are
797 * required to do so (e.g once done with initialization).
798 */
799 if (cmd->release) {
800 cmd->release = 0;
801 pmcraid_return_cmd(cmd);
802 }
803}
804
805/**
806 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
807 *
808 * @cmd: command that got response from IOA
809 *
810 * This routine is called after driver re-reads configuration table due to a
811 * lost CCN. It returns the command block back to free pool and schedules
812 * worker thread to add/delete devices into the system.
813 *
814 * Return Value:
815 * none
816 */
817static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
818{
819 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
820 cmd->ioa_cb->ioarcb.cdb[0],
821 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
822
823 if (cmd->release) {
824 cmd->release = 0;
825 pmcraid_return_cmd(cmd);
826 }
827 pmcraid_info("scheduling worker for config table reinitialization\n");
828 schedule_work(&cmd->drv_inst->worker_q);
829}
830
831/**
832 * pmcraid_erp_done - Process completion of SCSI error response from device
833 * @cmd: pmcraid_command
834 *
835 * This function copies the sense buffer into the scsi_cmd struct and completes
836 * scsi_cmd by calling scsi_done function.
837 *
838 * Return value:
839 * none
840 */
841static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
842{
843 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
844 struct pmcraid_instance *pinstance = cmd->drv_inst;
845 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
846
847 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
848 scsi_cmd->result |= (DID_ERROR << 16);
849 scmd_printk(KERN_INFO, scsi_cmd,
850 "command CDB[0] = %x failed with IOASC: 0x%08X\n",
851 cmd->ioa_cb->ioarcb.cdb[0], ioasc);
852 }
853
854 /* if we had allocated sense buffers for request sense, copy the sense
855 * release the buffers
856 */
857 if (cmd->sense_buffer != NULL) {
858 memcpy(scsi_cmd->sense_buffer,
859 cmd->sense_buffer,
860 SCSI_SENSE_BUFFERSIZE);
861 pci_free_consistent(pinstance->pdev,
862 SCSI_SENSE_BUFFERSIZE,
863 cmd->sense_buffer, cmd->sense_buffer_dma);
864 cmd->sense_buffer = NULL;
865 cmd->sense_buffer_dma = 0;
866 }
867
868 scsi_dma_unmap(scsi_cmd);
869 pmcraid_return_cmd(cmd);
870 scsi_cmd->scsi_done(scsi_cmd);
871}
872
873/**
874 * pmcraid_fire_command - sends an IOA command to adapter
875 *
876 * This function adds the given block into pending command list
877 * and returns without waiting
878 *
879 * @cmd : command to be sent to the device
880 *
881 * Return Value
882 * None
883 */
884static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
885{
886 struct pmcraid_instance *pinstance = cmd->drv_inst;
887 unsigned long lock_flags;
888
889 /* Add this command block to pending cmd pool. We do this prior to
890 * writting IOARCB to ioarrin because IOA might complete the command
891 * by the time we are about to add it to the list. Response handler
892 * (isr/tasklet) looks for cmd block in the pending pending list.
893 */
894 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
895 list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
896 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
897 atomic_inc(&pinstance->outstanding_cmds);
898
899 /* driver writes lower 32-bit value of IOARCB address only */
900 mb();
901 iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
902 pinstance->ioarrin);
903}
904
905/**
906 * pmcraid_send_cmd - fires a command to IOA
907 *
908 * This function also sets up timeout function, and command completion
909 * function
910 *
911 * @cmd: pointer to the command block to be fired to IOA
912 * @cmd_done: command completion function, called once IOA responds
913 * @timeout: timeout to wait for this command completion
914 * @timeout_func: timeout handler
915 *
916 * Return value
917 * none
918 */
919static void pmcraid_send_cmd(
920 struct pmcraid_cmd *cmd,
921 void (*cmd_done) (struct pmcraid_cmd *),
922 unsigned long timeout,
923 void (*timeout_func) (struct pmcraid_cmd *)
924)
925{
926 /* initialize done function */
927 cmd->cmd_done = cmd_done;
928
929 if (timeout_func) {
930 /* setup timeout handler */
931 cmd->timer.data = (unsigned long)cmd;
932 cmd->timer.expires = jiffies + timeout;
933 cmd->timer.function = (void (*)(unsigned long))timeout_func;
934 add_timer(&cmd->timer);
935 }
936
937 /* fire the command to IOA */
938 _pmcraid_fire_command(cmd);
939}
940
941/**
942 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
943 * @cmd: pointer to the command block used for sending IOA shutdown command
944 *
945 * Return value
946 * None
947 */
948static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
949{
950 struct pmcraid_instance *pinstance = cmd->drv_inst;
951 unsigned long lock_flags;
952
953 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
954 pmcraid_ioa_reset(cmd);
955 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
956}
957
958/**
959 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
960 *
961 * @cmd: pointer to the command block used as part of reset sequence
962 *
963 * Return Value
964 * None
965 */
966static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
967{
968 pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
969 cmd->ioa_cb->ioarcb.cdb[0],
970 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
971
972 /* Note that commands sent during reset require next command to be sent
973 * to IOA. Hence reinit the done function as well as timeout function
974 */
975 pmcraid_reinit_cmdblk(cmd);
976 cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
977 cmd->ioa_cb->ioarcb.resource_handle =
978 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
979 cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
980 cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
981
982 /* fire shutdown command to hardware. */
983 pmcraid_info("firing normal shutdown command (%d) to IOA\n",
984 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
985
986 pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
987
988 pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
989 PMCRAID_SHUTDOWN_TIMEOUT,
990 pmcraid_timeout_handler);
991}
992
993/**
994 * pmcraid_get_fwversion_done - completion function for get_fwversion
995 *
996 * @cmd: pointer to command block used to send INQUIRY command
997 *
998 * Return Value
999 * none
1000 */
1001static void pmcraid_querycfg(struct pmcraid_cmd *);
1002
1003static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
1004{
1005 struct pmcraid_instance *pinstance = cmd->drv_inst;
1006 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1007 unsigned long lock_flags;
1008
1009 /* configuration table entry size depends on firmware version. If fw
1010 * version is not known, it is not possible to interpret IOA config
1011 * table
1012 */
1013 if (ioasc) {
1014 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
1015 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1016 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1017 pmcraid_reset_alert(cmd);
1018 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1019 } else {
1020 pmcraid_querycfg(cmd);
1021 }
1022}
1023
1024/**
1025 * pmcraid_get_fwversion - reads firmware version information
1026 *
1027 * @cmd: pointer to command block used to send INQUIRY command
1028 *
1029 * Return Value
1030 * none
1031 */
1032static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1033{
1034 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1035 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
1036 struct pmcraid_instance *pinstance = cmd->drv_inst;
1037 u16 data_size = sizeof(struct pmcraid_inquiry_data);
1038
1039 pmcraid_reinit_cmdblk(cmd);
1040 ioarcb->request_type = REQ_TYPE_SCSI;
1041 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1042 ioarcb->cdb[0] = INQUIRY;
1043 ioarcb->cdb[1] = 1;
1044 ioarcb->cdb[2] = 0xD0;
1045 ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1046 ioarcb->cdb[4] = data_size & 0xFF;
1047
1048 /* Since entire inquiry data it can be part of IOARCB itself
1049 */
1050 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1051 offsetof(struct pmcraid_ioarcb,
1052 add_data.u.ioadl[0]));
1053 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1054 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
1055
1056 ioarcb->request_flags0 |= NO_LINK_DESCS;
1057 ioarcb->data_transfer_length = cpu_to_le32(data_size);
1058 ioadl = &(ioarcb->add_data.u.ioadl[0]);
1059 ioadl->flags = IOADL_FLAGS_LAST_DESC;
1060 ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1061 ioadl->data_len = cpu_to_le32(data_size);
1062
1063 pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1064 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1065}
1066
1067/**
1068 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1069 * @cmd: pointer to command block to be used for identify hrrq
1070 *
1071 * Return Value
1072 * none
1073 */
1074static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1075{
1076 struct pmcraid_instance *pinstance = cmd->drv_inst;
1077 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1078 int index = cmd->hrrq_index;
1079 __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1080 u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1081 void (*done_function)(struct pmcraid_cmd *);
1082
1083 pmcraid_reinit_cmdblk(cmd);
1084 cmd->hrrq_index = index + 1;
1085
1086 if (cmd->hrrq_index < pinstance->num_hrrq) {
1087 done_function = pmcraid_identify_hrrq;
1088 } else {
1089 cmd->hrrq_index = 0;
1090 done_function = pmcraid_get_fwversion;
1091 }
1092
1093 /* Initialize ioarcb */
1094 ioarcb->request_type = REQ_TYPE_IOACMD;
1095 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1096
1097 /* initialize the hrrq number where IOA will respond to this command */
1098 ioarcb->hrrq_id = index;
1099 ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1100 ioarcb->cdb[1] = index;
1101
1102 /* IOA expects 64-bit pci address to be written in B.E format
1103 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1104 */
1105 pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1106 hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1107
1108 memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1109 memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1110
1111 /* Subsequent commands require HRRQ identification to be successful.
1112 * Note that this gets called even during reset from SCSI mid-layer
1113 * or tasklet
1114 */
1115 pmcraid_send_cmd(cmd, done_function,
1116 PMCRAID_INTERNAL_TIMEOUT,
1117 pmcraid_timeout_handler);
1118}
1119
1120static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1121static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1122
1123/**
1124 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1125 *
1126 * @cmd: initialized command block pointer
1127 *
1128 * Return Value
1129 * none
1130 */
1131static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1132{
1133 if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1134 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1135 else
1136 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1137
1138 pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1139}
1140
1141/**
1142 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1143 *
1144 * @pinstance: pointer to adapter instance structure
1145 * @type: HCAM type
1146 *
1147 * Return Value
1148 * pointer to initialized pmcraid_cmd structure or NULL
1149 */
1150static struct pmcraid_cmd *pmcraid_init_hcam
1151(
1152 struct pmcraid_instance *pinstance,
1153 u8 type
1154)
1155{
1156 struct pmcraid_cmd *cmd;
1157 struct pmcraid_ioarcb *ioarcb;
1158 struct pmcraid_ioadl_desc *ioadl;
1159 struct pmcraid_hostrcb *hcam;
1160 void (*cmd_done) (struct pmcraid_cmd *);
1161 dma_addr_t dma;
1162 int rcb_size;
1163
1164 cmd = pmcraid_get_free_cmd(pinstance);
1165
1166 if (!cmd) {
1167 pmcraid_err("no free command blocks for hcam\n");
1168 return cmd;
1169 }
1170
1171 if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1172 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1173 cmd_done = pmcraid_process_ccn;
1174 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1175 hcam = &pinstance->ccn;
1176 } else {
1177 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1178 cmd_done = pmcraid_process_ldn;
1179 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1180 hcam = &pinstance->ldn;
1181 }
1182
1183 /* initialize command pointer used for HCAM registration */
1184 hcam->cmd = cmd;
1185
1186 ioarcb = &cmd->ioa_cb->ioarcb;
1187 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1188 offsetof(struct pmcraid_ioarcb,
1189 add_data.u.ioadl[0]));
1190 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1191 ioadl = ioarcb->add_data.u.ioadl;
1192
1193 /* Initialize ioarcb */
1194 ioarcb->request_type = REQ_TYPE_HCAM;
1195 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1196 ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1197 ioarcb->cdb[1] = type;
1198 ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1199 ioarcb->cdb[8] = (rcb_size) & 0xFF;
1200
1201 ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1202
1203 ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1204 ioadl[0].data_len = cpu_to_le32(rcb_size);
1205 ioadl[0].address = cpu_to_le32(dma);
1206
1207 cmd->cmd_done = cmd_done;
1208 return cmd;
1209}
1210
1211/**
1212 * pmcraid_send_hcam - Send an HCAM to IOA
1213 * @pinstance: ioa config struct
1214 * @type: HCAM type
1215 *
1216 * This function will send a Host Controlled Async command to IOA.
1217 *
1218 * Return value:
1219 * none
1220 */
1221static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1222{
1223 struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1224 pmcraid_send_hcam_cmd(cmd);
1225}
1226
1227
1228/**
1229 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1230 *
1231 * @cmd: pointer to cmd that is used as cancelling command
1232 * @cmd_to_cancel: pointer to the command that needs to be cancelled
1233 */
1234static void pmcraid_prepare_cancel_cmd(
1235 struct pmcraid_cmd *cmd,
1236 struct pmcraid_cmd *cmd_to_cancel
1237)
1238{
1239 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1240 __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
1241
1242 /* Get the resource handle to where the command to be aborted has been
1243 * sent.
1244 */
1245 ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1246 ioarcb->request_type = REQ_TYPE_IOACMD;
1247 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1248 ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1249
1250 /* IOARCB address of the command to be cancelled is given in
1251 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1252 * IOARCB address are not masked.
1253 */
1254 ioarcb_addr = cpu_to_be64(ioarcb_addr);
1255 memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1256}
1257
1258/**
1259 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1260 *
1261 * @cmd: command to be used as cancelling command
1262 * @type: HCAM type
1263 * @cmd_done: op done function for the cancelling command
1264 */
1265static void pmcraid_cancel_hcam(
1266 struct pmcraid_cmd *cmd,
1267 u8 type,
1268 void (*cmd_done) (struct pmcraid_cmd *)
1269)
1270{
1271 struct pmcraid_instance *pinstance;
1272 struct pmcraid_hostrcb *hcam;
1273
1274 pinstance = cmd->drv_inst;
1275 hcam = (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1276 &pinstance->ldn : &pinstance->ccn;
1277
1278 /* prepare for cancelling previous hcam command. If the HCAM is
1279 * currently not pending with IOA, we would have hcam->cmd as non-null
1280 */
1281 if (hcam->cmd == NULL)
1282 return;
1283
1284 pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1285
1286 /* writing to IOARRIN must be protected by host_lock, as mid-layer
1287 * schedule queuecommand while we are doing this
1288 */
1289 pmcraid_send_cmd(cmd, cmd_done,
1290 PMCRAID_INTERNAL_TIMEOUT,
1291 pmcraid_timeout_handler);
1292}
1293
1294/**
1295 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1296 *
1297 * @cmd: command block to be used for cancelling the HCAM
1298 */
1299static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1300{
1301 pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1302 cmd->ioa_cb->ioarcb.cdb[0],
1303 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1304
1305 pmcraid_reinit_cmdblk(cmd);
1306
1307 pmcraid_cancel_hcam(cmd,
1308 PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1309 pmcraid_ioa_shutdown);
1310}
1311
1312/**
1313 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1314 *
1315 * @cmd: command block to be used for cancelling the HCAM
1316 */
1317static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1318{
1319 pmcraid_cancel_hcam(cmd,
1320 PMCRAID_HCAM_CODE_LOG_DATA,
1321 pmcraid_cancel_ccn);
1322}
1323
1324/**
1325 * pmcraid_expose_resource - check if the resource can be exposed to OS
1326 *
1327 * @fw_version: firmware version code
1328 * @cfgte: pointer to configuration table entry of the resource
1329 *
1330 * Return value:
1331 * true if resource can be added to midlayer, false(0) otherwise
1332 */
1333static int pmcraid_expose_resource(u16 fw_version,
1334 struct pmcraid_config_table_entry *cfgte)
1335{
1336 int retval = 0;
1337
1338 if (cfgte->resource_type == RES_TYPE_VSET) {
1339 if (fw_version <= PMCRAID_FW_VERSION_1)
1340 retval = ((cfgte->unique_flags1 & 0x80) == 0);
1341 else
1342 retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1343 (cfgte->unique_flags1 & 0x80) == 0);
1344
1345 } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1346 retval = (RES_BUS(cfgte->resource_address) !=
1347 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1348 return retval;
1349}
1350
1351/* attributes supported by pmcraid_event_family */
1352enum {
1353 PMCRAID_AEN_ATTR_UNSPEC,
1354 PMCRAID_AEN_ATTR_EVENT,
1355 __PMCRAID_AEN_ATTR_MAX,
1356};
1357#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1358
1359/* commands supported by pmcraid_event_family */
1360enum {
1361 PMCRAID_AEN_CMD_UNSPEC,
1362 PMCRAID_AEN_CMD_EVENT,
1363 __PMCRAID_AEN_CMD_MAX,
1364};
1365#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1366
1367static struct genl_multicast_group pmcraid_mcgrps[] = {
1368 { .name = "events", /* not really used - see ID discussion below */ },
1369};
1370
1371static struct genl_family pmcraid_event_family __ro_after_init = {
1372 .module = THIS_MODULE,
1373 .name = "pmcraid",
1374 .version = 1,
1375 .maxattr = PMCRAID_AEN_ATTR_MAX,
1376 .mcgrps = pmcraid_mcgrps,
1377 .n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
1378};
1379
1380/**
1381 * pmcraid_netlink_init - registers pmcraid_event_family
1382 *
1383 * Return value:
1384 * 0 if the pmcraid_event_family is successfully registered
1385 * with netlink generic, non-zero otherwise
1386 */
1387static int __init pmcraid_netlink_init(void)
1388{
1389 int result;
1390
1391 result = genl_register_family(&pmcraid_event_family);
1392
1393 if (result)
1394 return result;
1395
1396 pmcraid_info("registered NETLINK GENERIC group: %d\n",
1397 pmcraid_event_family.id);
1398
1399 return result;
1400}
1401
1402/**
1403 * pmcraid_netlink_release - unregisters pmcraid_event_family
1404 *
1405 * Return value:
1406 * none
1407 */
1408static void pmcraid_netlink_release(void)
1409{
1410 genl_unregister_family(&pmcraid_event_family);
1411}
1412
1413/**
1414 * pmcraid_notify_aen - sends event msg to user space application
1415 * @pinstance: pointer to adapter instance structure
1416 * @type: HCAM type
1417 *
1418 * Return value:
1419 * 0 if success, error value in case of any failure.
1420 */
1421static int pmcraid_notify_aen(
1422 struct pmcraid_instance *pinstance,
1423 struct pmcraid_aen_msg *aen_msg,
1424 u32 data_size
1425)
1426{
1427 struct sk_buff *skb;
1428 void *msg_header;
1429 u32 total_size, nla_genl_hdr_total_size;
1430 int result;
1431
1432 aen_msg->hostno = (pinstance->host->unique_id << 16 |
1433 MINOR(pinstance->cdev.dev));
1434 aen_msg->length = data_size;
1435
1436 data_size += sizeof(*aen_msg);
1437
1438 total_size = nla_total_size(data_size);
1439 /* Add GENL_HDR to total_size */
1440 nla_genl_hdr_total_size =
1441 (total_size + (GENL_HDRLEN +
1442 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1443 + NLMSG_HDRLEN);
1444 skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1445
1446
1447 if (!skb) {
1448 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1449 total_size);
1450 return -ENOMEM;
1451 }
1452
1453 /* add the genetlink message header */
1454 msg_header = genlmsg_put(skb, 0, 0,
1455 &pmcraid_event_family, 0,
1456 PMCRAID_AEN_CMD_EVENT);
1457 if (!msg_header) {
1458 pmcraid_err("failed to copy command details\n");
1459 nlmsg_free(skb);
1460 return -ENOMEM;
1461 }
1462
1463 result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1464
1465 if (result) {
1466 pmcraid_err("failed to copy AEN attribute data\n");
1467 nlmsg_free(skb);
1468 return -EINVAL;
1469 }
1470
1471 /* send genetlink multicast message to notify appplications */
1472 genlmsg_end(skb, msg_header);
1473
1474 result = genlmsg_multicast(&pmcraid_event_family, skb,
1475 0, 0, GFP_ATOMIC);
1476
1477 /* If there are no listeners, genlmsg_multicast may return non-zero
1478 * value.
1479 */
1480 if (result)
1481 pmcraid_info("error (%x) sending aen event message\n", result);
1482 return result;
1483}
1484
1485/**
1486 * pmcraid_notify_ccn - notifies about CCN event msg to user space
1487 * @pinstance: pointer adapter instance structure
1488 *
1489 * Return value:
1490 * 0 if success, error value in case of any failure
1491 */
1492static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1493{
1494 return pmcraid_notify_aen(pinstance,
1495 pinstance->ccn.msg,
1496 pinstance->ccn.hcam->data_len +
1497 sizeof(struct pmcraid_hcam_hdr));
1498}
1499
1500/**
1501 * pmcraid_notify_ldn - notifies about CCN event msg to user space
1502 * @pinstance: pointer adapter instance structure
1503 *
1504 * Return value:
1505 * 0 if success, error value in case of any failure
1506 */
1507static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1508{
1509 return pmcraid_notify_aen(pinstance,
1510 pinstance->ldn.msg,
1511 pinstance->ldn.hcam->data_len +
1512 sizeof(struct pmcraid_hcam_hdr));
1513}
1514
1515/**
1516 * pmcraid_notify_ioastate - sends IOA state event msg to user space
1517 * @pinstance: pointer adapter instance structure
1518 * @evt: controller state event to be sent
1519 *
1520 * Return value:
1521 * 0 if success, error value in case of any failure
1522 */
1523static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1524{
1525 pinstance->scn.ioa_state = evt;
1526 pmcraid_notify_aen(pinstance,
1527 &pinstance->scn.msg,
1528 sizeof(u32));
1529}
1530
1531/**
1532 * pmcraid_handle_config_change - Handle a config change from the adapter
1533 * @pinstance: pointer to per adapter instance structure
1534 *
1535 * Return value:
1536 * none
1537 */
1538
1539static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1540{
1541 struct pmcraid_config_table_entry *cfg_entry;
1542 struct pmcraid_hcam_ccn *ccn_hcam;
1543 struct pmcraid_cmd *cmd;
1544 struct pmcraid_cmd *cfgcmd;
1545 struct pmcraid_resource_entry *res = NULL;
1546 unsigned long lock_flags;
1547 unsigned long host_lock_flags;
1548 u32 new_entry = 1;
1549 u32 hidden_entry = 0;
1550 u16 fw_version;
1551 int rc;
1552
1553 ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1554 cfg_entry = &ccn_hcam->cfg_entry;
1555 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1556
1557 pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1558 res: %x:%x:%x:%x\n",
1559 pinstance->ccn.hcam->ilid,
1560 pinstance->ccn.hcam->op_code,
1561 ((pinstance->ccn.hcam->timestamp1) |
1562 ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
1563 pinstance->ccn.hcam->notification_type,
1564 pinstance->ccn.hcam->notification_lost,
1565 pinstance->ccn.hcam->flags,
1566 pinstance->host->unique_id,
1567 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1568 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1569 RES_BUS(cfg_entry->resource_address)),
1570 RES_IS_VSET(*cfg_entry) ?
1571 (fw_version <= PMCRAID_FW_VERSION_1 ?
1572 cfg_entry->unique_flags1 :
1573 cfg_entry->array_id & 0xFF) :
1574 RES_TARGET(cfg_entry->resource_address),
1575 RES_LUN(cfg_entry->resource_address));
1576
1577
1578 /* If this HCAM indicates a lost notification, read the config table */
1579 if (pinstance->ccn.hcam->notification_lost) {
1580 cfgcmd = pmcraid_get_free_cmd(pinstance);
1581 if (cfgcmd) {
1582 pmcraid_info("lost CCN, reading config table\b");
1583 pinstance->reinit_cfg_table = 1;
1584 pmcraid_querycfg(cfgcmd);
1585 } else {
1586 pmcraid_err("lost CCN, no free cmd for querycfg\n");
1587 }
1588 goto out_notify_apps;
1589 }
1590
1591 /* If this resource is not going to be added to mid-layer, just notify
1592 * applications and return. If this notification is about hiding a VSET
1593 * resource, check if it was exposed already.
1594 */
1595 if (pinstance->ccn.hcam->notification_type ==
1596 NOTIFICATION_TYPE_ENTRY_CHANGED &&
1597 cfg_entry->resource_type == RES_TYPE_VSET) {
1598
1599 if (fw_version <= PMCRAID_FW_VERSION_1)
1600 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1601 else
1602 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1603
1604 } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1605 goto out_notify_apps;
1606 }
1607
1608 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1609 list_for_each_entry(res, &pinstance->used_res_q, queue) {
1610 rc = memcmp(&res->cfg_entry.resource_address,
1611 &cfg_entry->resource_address,
1612 sizeof(cfg_entry->resource_address));
1613 if (!rc) {
1614 new_entry = 0;
1615 break;
1616 }
1617 }
1618
1619 if (new_entry) {
1620
1621 if (hidden_entry) {
1622 spin_unlock_irqrestore(&pinstance->resource_lock,
1623 lock_flags);
1624 goto out_notify_apps;
1625 }
1626
1627 /* If there are more number of resources than what driver can
1628 * manage, do not notify the applications about the CCN. Just
1629 * ignore this notifications and re-register the same HCAM
1630 */
1631 if (list_empty(&pinstance->free_res_q)) {
1632 spin_unlock_irqrestore(&pinstance->resource_lock,
1633 lock_flags);
1634 pmcraid_err("too many resources attached\n");
1635 spin_lock_irqsave(pinstance->host->host_lock,
1636 host_lock_flags);
1637 pmcraid_send_hcam(pinstance,
1638 PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1639 spin_unlock_irqrestore(pinstance->host->host_lock,
1640 host_lock_flags);
1641 return;
1642 }
1643
1644 res = list_entry(pinstance->free_res_q.next,
1645 struct pmcraid_resource_entry, queue);
1646
1647 list_del(&res->queue);
1648 res->scsi_dev = NULL;
1649 res->reset_progress = 0;
1650 list_add_tail(&res->queue, &pinstance->used_res_q);
1651 }
1652
1653 memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1654
1655 if (pinstance->ccn.hcam->notification_type ==
1656 NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1657 if (res->scsi_dev) {
1658 if (fw_version <= PMCRAID_FW_VERSION_1)
1659 res->cfg_entry.unique_flags1 &= 0x7F;
1660 else
1661 res->cfg_entry.array_id &= 0xFF;
1662 res->change_detected = RES_CHANGE_DEL;
1663 res->cfg_entry.resource_handle =
1664 PMCRAID_INVALID_RES_HANDLE;
1665 schedule_work(&pinstance->worker_q);
1666 } else {
1667 /* This may be one of the non-exposed resources */
1668 list_move_tail(&res->queue, &pinstance->free_res_q);
1669 }
1670 } else if (!res->scsi_dev) {
1671 res->change_detected = RES_CHANGE_ADD;
1672 schedule_work(&pinstance->worker_q);
1673 }
1674 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1675
1676out_notify_apps:
1677
1678 /* Notify configuration changes to registered applications.*/
1679 if (!pmcraid_disable_aen)
1680 pmcraid_notify_ccn(pinstance);
1681
1682 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1683 if (cmd)
1684 pmcraid_send_hcam_cmd(cmd);
1685}
1686
1687/**
1688 * pmcraid_get_error_info - return error string for an ioasc
1689 * @ioasc: ioasc code
1690 * Return Value
1691 * none
1692 */
1693static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1694{
1695 int i;
1696 for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1697 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1698 return &pmcraid_ioasc_error_table[i];
1699 }
1700 return NULL;
1701}
1702
1703/**
1704 * pmcraid_ioasc_logger - log IOASC information based user-settings
1705 * @ioasc: ioasc code
1706 * @cmd: pointer to command that resulted in 'ioasc'
1707 */
1708static void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1709{
1710 struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1711
1712 if (error_info == NULL ||
1713 cmd->drv_inst->current_log_level < error_info->log_level)
1714 return;
1715
1716 /* log the error string */
1717 pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1718 cmd->ioa_cb->ioarcb.cdb[0],
1719 cmd->ioa_cb->ioarcb.resource_handle,
1720 le32_to_cpu(ioasc), error_info->error_string);
1721}
1722
1723/**
1724 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1725 *
1726 * @pinstance: pointer to per adapter instance structure
1727 *
1728 * Return value:
1729 * none
1730 */
1731static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1732{
1733 struct pmcraid_hcam_ldn *hcam_ldn;
1734 u32 ioasc;
1735
1736 hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1737
1738 pmcraid_info
1739 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1740 pinstance->ldn.hcam->ilid,
1741 pinstance->ldn.hcam->op_code,
1742 pinstance->ldn.hcam->notification_type,
1743 pinstance->ldn.hcam->notification_lost,
1744 pinstance->ldn.hcam->flags,
1745 pinstance->ldn.hcam->overlay_id);
1746
1747 /* log only the errors, no need to log informational log entries */
1748 if (pinstance->ldn.hcam->notification_type !=
1749 NOTIFICATION_TYPE_ERROR_LOG)
1750 return;
1751
1752 if (pinstance->ldn.hcam->notification_lost ==
1753 HOSTRCB_NOTIFICATIONS_LOST)
1754 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1755
1756 ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1757
1758 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1759 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1760 dev_info(&pinstance->pdev->dev,
1761 "UnitAttention due to IOA Bus Reset\n");
1762 scsi_report_bus_reset(
1763 pinstance->host,
1764 RES_BUS(hcam_ldn->error_log.fd_ra));
1765 }
1766
1767 return;
1768}
1769
1770/**
1771 * pmcraid_process_ccn - Op done function for a CCN.
1772 * @cmd: pointer to command struct
1773 *
1774 * This function is the op done function for a configuration
1775 * change notification
1776 *
1777 * Return value:
1778 * none
1779 */
1780static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1781{
1782 struct pmcraid_instance *pinstance = cmd->drv_inst;
1783 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1784 unsigned long lock_flags;
1785
1786 pinstance->ccn.cmd = NULL;
1787 pmcraid_return_cmd(cmd);
1788
1789 /* If driver initiated IOA reset happened while this hcam was pending
1790 * with IOA, or IOA bringdown sequence is in progress, no need to
1791 * re-register the hcam
1792 */
1793 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1794 atomic_read(&pinstance->ccn.ignore) == 1) {
1795 return;
1796 } else if (ioasc) {
1797 dev_info(&pinstance->pdev->dev,
1798 "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1799 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1800 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1801 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1802 } else {
1803 pmcraid_handle_config_change(pinstance);
1804 }
1805}
1806
1807/**
1808 * pmcraid_process_ldn - op done function for an LDN
1809 * @cmd: pointer to command block
1810 *
1811 * Return value
1812 * none
1813 */
1814static void pmcraid_initiate_reset(struct pmcraid_instance *);
1815static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1816
1817static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1818{
1819 struct pmcraid_instance *pinstance = cmd->drv_inst;
1820 struct pmcraid_hcam_ldn *ldn_hcam =
1821 (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1822 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1823 u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1824 unsigned long lock_flags;
1825
1826 /* return the command block back to freepool */
1827 pinstance->ldn.cmd = NULL;
1828 pmcraid_return_cmd(cmd);
1829
1830 /* If driver initiated IOA reset happened while this hcam was pending
1831 * with IOA, no need to re-register the hcam as reset engine will do it
1832 * once reset sequence is complete
1833 */
1834 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1835 atomic_read(&pinstance->ccn.ignore) == 1) {
1836 return;
1837 } else if (!ioasc) {
1838 pmcraid_handle_error_log(pinstance);
1839 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1840 spin_lock_irqsave(pinstance->host->host_lock,
1841 lock_flags);
1842 pmcraid_initiate_reset(pinstance);
1843 spin_unlock_irqrestore(pinstance->host->host_lock,
1844 lock_flags);
1845 return;
1846 }
1847 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1848 pinstance->timestamp_error = 1;
1849 pmcraid_set_timestamp(cmd);
1850 }
1851 } else {
1852 dev_info(&pinstance->pdev->dev,
1853 "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1854 }
1855 /* send netlink message for HCAM notification if enabled */
1856 if (!pmcraid_disable_aen)
1857 pmcraid_notify_ldn(pinstance);
1858
1859 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1860 if (cmd)
1861 pmcraid_send_hcam_cmd(cmd);
1862}
1863
1864/**
1865 * pmcraid_register_hcams - register HCAMs for CCN and LDN
1866 *
1867 * @pinstance: pointer per adapter instance structure
1868 *
1869 * Return Value
1870 * none
1871 */
1872static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1873{
1874 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1875 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1876}
1877
1878/**
1879 * pmcraid_unregister_hcams - cancel HCAMs registered already
1880 * @cmd: pointer to command used as part of reset sequence
1881 */
1882static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1883{
1884 struct pmcraid_instance *pinstance = cmd->drv_inst;
1885
1886 /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1887 * handling hcam response though it is not necessary. In order to
1888 * prevent this, set 'ignore', so that bring-down sequence doesn't
1889 * re-send any more hcams
1890 */
1891 atomic_set(&pinstance->ccn.ignore, 1);
1892 atomic_set(&pinstance->ldn.ignore, 1);
1893
1894 /* If adapter reset was forced as part of runtime reset sequence,
1895 * start the reset sequence. Reset will be triggered even in case
1896 * IOA unit_check.
1897 */
1898 if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1899 pinstance->ioa_unit_check) {
1900 pinstance->force_ioa_reset = 0;
1901 pinstance->ioa_unit_check = 0;
1902 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1903 pmcraid_reset_alert(cmd);
1904 return;
1905 }
1906
1907 /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1908 * one after the other. So CCN cancellation will be triggered by
1909 * pmcraid_cancel_ldn itself.
1910 */
1911 pmcraid_cancel_ldn(cmd);
1912}
1913
1914/**
1915 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1916 * @pinstance: pointer to adapter instance structure
1917 * Return Value
1918 * 1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1919 */
1920static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1921
1922static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1923{
1924 u32 intrs;
1925
1926 pmcraid_reinit_buffers(pinstance);
1927 intrs = pmcraid_read_interrupts(pinstance);
1928
1929 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1930
1931 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1932 if (!pinstance->interrupt_mode) {
1933 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1934 pinstance->int_regs.
1935 ioa_host_interrupt_mask_reg);
1936 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1937 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1938 }
1939 return 1;
1940 } else {
1941 return 0;
1942 }
1943}
1944
1945/**
1946 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1947 * @cmd : pointer to reset command block
1948 *
1949 * Return Value
1950 * none
1951 */
1952static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1953{
1954 struct pmcraid_instance *pinstance = cmd->drv_inst;
1955 u32 int_reg;
1956 u32 doorbell;
1957
1958 /* There will be an interrupt when Transition to Operational bit is
1959 * set so tasklet would execute next reset task. The timeout handler
1960 * would re-initiate a reset
1961 */
1962 cmd->cmd_done = pmcraid_ioa_reset;
1963 cmd->timer.data = (unsigned long)cmd;
1964 cmd->timer.expires = jiffies +
1965 msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
1966 cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
1967
1968 if (!timer_pending(&cmd->timer))
1969 add_timer(&cmd->timer);
1970
1971 /* Enable destructive diagnostics on IOA if it is not yet in
1972 * operational state
1973 */
1974 doorbell = DOORBELL_RUNTIME_RESET |
1975 DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
1976
1977 /* Since we do RESET_ALERT and Start BIST we have to again write
1978 * MSIX Doorbell to indicate the interrupt mode
1979 */
1980 if (pinstance->interrupt_mode) {
1981 iowrite32(DOORBELL_INTR_MODE_MSIX,
1982 pinstance->int_regs.host_ioa_interrupt_reg);
1983 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
1984 }
1985
1986 iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
1987 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1988 int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
1989
1990 pmcraid_info("Waiting for IOA to become operational %x:%x\n",
1991 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1992 int_reg);
1993}
1994
1995/**
1996 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
1997 *
1998 * @pinstance: pointer to adapter instance structure
1999 *
2000 * Return Value
2001 * none
2002 */
2003static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
2004{
2005 pmcraid_info("%s is not yet implemented\n", __func__);
2006}
2007
2008/**
2009 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
2010 * @pinstance: pointer to adapter instance structure
2011 *
2012 * This function fails all outstanding ops. If they are submitted to IOA
2013 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
2014 * otherwise just completes the commands and returns the cmd blocks to free
2015 * pool.
2016 *
2017 * Return value:
2018 * none
2019 */
2020static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
2021{
2022 struct pmcraid_cmd *cmd, *temp;
2023 unsigned long lock_flags;
2024
2025 /* pending command list is protected by pending_pool_lock. Its
2026 * traversal must be done as within this lock
2027 */
2028 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2029 list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
2030 free_list) {
2031 list_del(&cmd->free_list);
2032 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2033 lock_flags);
2034 cmd->ioa_cb->ioasa.ioasc =
2035 cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
2036 cmd->ioa_cb->ioasa.ilid =
2037 cpu_to_be32(PMCRAID_DRIVER_ILID);
2038
2039 /* In case the command timer is still running */
2040 del_timer(&cmd->timer);
2041
2042 /* If this is an IO command, complete it by invoking scsi_done
2043 * function. If this is one of the internal commands other
2044 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2045 * complete it
2046 */
2047 if (cmd->scsi_cmd) {
2048
2049 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2050 __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2051
2052 scsi_cmd->result |= DID_ERROR << 16;
2053
2054 scsi_dma_unmap(scsi_cmd);
2055 pmcraid_return_cmd(cmd);
2056
2057 pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2058 le32_to_cpu(resp) >> 2,
2059 cmd->ioa_cb->ioarcb.cdb[0],
2060 scsi_cmd->result);
2061 scsi_cmd->scsi_done(scsi_cmd);
2062 } else if (cmd->cmd_done == pmcraid_internal_done ||
2063 cmd->cmd_done == pmcraid_erp_done) {
2064 cmd->cmd_done(cmd);
2065 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2066 cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2067 pmcraid_return_cmd(cmd);
2068 }
2069
2070 atomic_dec(&pinstance->outstanding_cmds);
2071 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2072 }
2073
2074 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2075}
2076
2077/**
2078 * pmcraid_ioa_reset - Implementation of IOA reset logic
2079 *
2080 * @cmd: pointer to the cmd block to be used for entire reset process
2081 *
2082 * This function executes most of the steps required for IOA reset. This gets
2083 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2084 * 'eh_' thread. Access to variables used for controlling the reset sequence is
2085 * synchronized using host lock. Various functions called during reset process
2086 * would make use of a single command block, pointer to which is also stored in
2087 * adapter instance structure.
2088 *
2089 * Return Value
2090 * None
2091 */
2092static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2093{
2094 struct pmcraid_instance *pinstance = cmd->drv_inst;
2095 u8 reset_complete = 0;
2096
2097 pinstance->ioa_reset_in_progress = 1;
2098
2099 if (pinstance->reset_cmd != cmd) {
2100 pmcraid_err("reset is called with different command block\n");
2101 pinstance->reset_cmd = cmd;
2102 }
2103
2104 pmcraid_info("reset_engine: state = %d, command = %p\n",
2105 pinstance->ioa_state, cmd);
2106
2107 switch (pinstance->ioa_state) {
2108
2109 case IOA_STATE_DEAD:
2110 /* If IOA is offline, whatever may be the reset reason, just
2111 * return. callers might be waiting on the reset wait_q, wake
2112 * up them
2113 */
2114 pmcraid_err("IOA is offline no reset is possible\n");
2115 reset_complete = 1;
2116 break;
2117
2118 case IOA_STATE_IN_BRINGDOWN:
2119 /* we enter here, once ioa shutdown command is processed by IOA
2120 * Alert IOA for a possible reset. If reset alert fails, IOA
2121 * goes through hard-reset
2122 */
2123 pmcraid_disable_interrupts(pinstance, ~0);
2124 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2125 pmcraid_reset_alert(cmd);
2126 break;
2127
2128 case IOA_STATE_UNKNOWN:
2129 /* We may be called during probe or resume. Some pre-processing
2130 * is required for prior to reset
2131 */
2132 scsi_block_requests(pinstance->host);
2133
2134 /* If asked to reset while IOA was processing responses or
2135 * there are any error responses then IOA may require
2136 * hard-reset.
2137 */
2138 if (pinstance->ioa_hard_reset == 0) {
2139 if (ioread32(pinstance->ioa_status) &
2140 INTRS_TRANSITION_TO_OPERATIONAL) {
2141 pmcraid_info("sticky bit set, bring-up\n");
2142 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2143 pmcraid_reinit_cmdblk(cmd);
2144 pmcraid_identify_hrrq(cmd);
2145 } else {
2146 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2147 pmcraid_soft_reset(cmd);
2148 }
2149 } else {
2150 /* Alert IOA of a possible reset and wait for critical
2151 * operation in progress bit to reset
2152 */
2153 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2154 pmcraid_reset_alert(cmd);
2155 }
2156 break;
2157
2158 case IOA_STATE_IN_RESET_ALERT:
2159 /* If critical operation in progress bit is reset or wait gets
2160 * timed out, reset proceeds with starting BIST on the IOA.
2161 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2162 * they are 3 or more, reset engine marks IOA dead and returns
2163 */
2164 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2165 pmcraid_start_bist(cmd);
2166 break;
2167
2168 case IOA_STATE_IN_HARD_RESET:
2169 pinstance->ioa_reset_attempts++;
2170
2171 /* retry reset if we haven't reached maximum allowed limit */
2172 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2173 pinstance->ioa_reset_attempts = 0;
2174 pmcraid_err("IOA didn't respond marking it as dead\n");
2175 pinstance->ioa_state = IOA_STATE_DEAD;
2176
2177 if (pinstance->ioa_bringdown)
2178 pmcraid_notify_ioastate(pinstance,
2179 PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2180 else
2181 pmcraid_notify_ioastate(pinstance,
2182 PMC_DEVICE_EVENT_RESET_FAILED);
2183 reset_complete = 1;
2184 break;
2185 }
2186
2187 /* Once either bist or pci reset is done, restore PCI config
2188 * space. If this fails, proceed with hard reset again
2189 */
2190 pci_restore_state(pinstance->pdev);
2191
2192 /* fail all pending commands */
2193 pmcraid_fail_outstanding_cmds(pinstance);
2194
2195 /* check if unit check is active, if so extract dump */
2196 if (pinstance->ioa_unit_check) {
2197 pmcraid_info("unit check is active\n");
2198 pinstance->ioa_unit_check = 0;
2199 pmcraid_get_dump(pinstance);
2200 pinstance->ioa_reset_attempts--;
2201 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2202 pmcraid_reset_alert(cmd);
2203 break;
2204 }
2205
2206 /* if the reset reason is to bring-down the ioa, we might be
2207 * done with the reset restore pci_config_space and complete
2208 * the reset
2209 */
2210 if (pinstance->ioa_bringdown) {
2211 pmcraid_info("bringing down the adapter\n");
2212 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2213 pinstance->ioa_bringdown = 0;
2214 pinstance->ioa_state = IOA_STATE_UNKNOWN;
2215 pmcraid_notify_ioastate(pinstance,
2216 PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2217 reset_complete = 1;
2218 } else {
2219 /* bring-up IOA, so proceed with soft reset
2220 * Reinitialize hrrq_buffers and their indices also
2221 * enable interrupts after a pci_restore_state
2222 */
2223 if (pmcraid_reset_enable_ioa(pinstance)) {
2224 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2225 pmcraid_info("bringing up the adapter\n");
2226 pmcraid_reinit_cmdblk(cmd);
2227 pmcraid_identify_hrrq(cmd);
2228 } else {
2229 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2230 pmcraid_soft_reset(cmd);
2231 }
2232 }
2233 break;
2234
2235 case IOA_STATE_IN_SOFT_RESET:
2236 /* TRANSITION TO OPERATIONAL is on so start initialization
2237 * sequence
2238 */
2239 pmcraid_info("In softreset proceeding with bring-up\n");
2240 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2241
2242 /* Initialization commands start with HRRQ identification. From
2243 * now on tasklet completes most of the commands as IOA is up
2244 * and intrs are enabled
2245 */
2246 pmcraid_identify_hrrq(cmd);
2247 break;
2248
2249 case IOA_STATE_IN_BRINGUP:
2250 /* we are done with bringing up of IOA, change the ioa_state to
2251 * operational and wake up any waiters
2252 */
2253 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2254 reset_complete = 1;
2255 break;
2256
2257 case IOA_STATE_OPERATIONAL:
2258 default:
2259 /* When IOA is operational and a reset is requested, check for
2260 * the reset reason. If reset is to bring down IOA, unregister
2261 * HCAMs and initiate shutdown; if adapter reset is forced then
2262 * restart reset sequence again
2263 */
2264 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2265 pinstance->force_ioa_reset == 0) {
2266 pmcraid_notify_ioastate(pinstance,
2267 PMC_DEVICE_EVENT_RESET_SUCCESS);
2268 reset_complete = 1;
2269 } else {
2270 if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2271 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2272 pmcraid_reinit_cmdblk(cmd);
2273 pmcraid_unregister_hcams(cmd);
2274 }
2275 break;
2276 }
2277
2278 /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2279 * OPERATIONAL. Reset all control variables used during reset, wake up
2280 * any waiting threads and let the SCSI mid-layer send commands. Note
2281 * that host_lock must be held before invoking scsi_report_bus_reset.
2282 */
2283 if (reset_complete) {
2284 pinstance->ioa_reset_in_progress = 0;
2285 pinstance->ioa_reset_attempts = 0;
2286 pinstance->reset_cmd = NULL;
2287 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2288 pinstance->ioa_bringdown = 0;
2289 pmcraid_return_cmd(cmd);
2290
2291 /* If target state is to bring up the adapter, proceed with
2292 * hcam registration and resource exposure to mid-layer.
2293 */
2294 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2295 pmcraid_register_hcams(pinstance);
2296
2297 wake_up_all(&pinstance->reset_wait_q);
2298 }
2299
2300 return;
2301}
2302
2303/**
2304 * pmcraid_initiate_reset - initiates reset sequence. This is called from
2305 * ISR/tasklet during error interrupts including IOA unit check. If reset
2306 * is already in progress, it just returns, otherwise initiates IOA reset
2307 * to bring IOA up to operational state.
2308 *
2309 * @pinstance: pointer to adapter instance structure
2310 *
2311 * Return value
2312 * none
2313 */
2314static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2315{
2316 struct pmcraid_cmd *cmd;
2317
2318 /* If the reset is already in progress, just return, otherwise start
2319 * reset sequence and return
2320 */
2321 if (!pinstance->ioa_reset_in_progress) {
2322 scsi_block_requests(pinstance->host);
2323 cmd = pmcraid_get_free_cmd(pinstance);
2324
2325 if (cmd == NULL) {
2326 pmcraid_err("no cmnd blocks for initiate_reset\n");
2327 return;
2328 }
2329
2330 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2331 pinstance->reset_cmd = cmd;
2332 pinstance->force_ioa_reset = 1;
2333 pmcraid_notify_ioastate(pinstance,
2334 PMC_DEVICE_EVENT_RESET_START);
2335 pmcraid_ioa_reset(cmd);
2336 }
2337}
2338
2339/**
2340 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2341 * or bringdown IOA
2342 * @pinstance: pointer adapter instance structure
2343 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2344 * @target_state: expected target state after reset
2345 *
2346 * Note: This command initiates reset and waits for its completion. Hence this
2347 * should not be called from isr/timer/tasklet functions (timeout handlers,
2348 * error response handlers and interrupt handlers).
2349 *
2350 * Return Value
2351 * 1 in case ioa_state is not target_state, 0 otherwise.
2352 */
2353static int pmcraid_reset_reload(
2354 struct pmcraid_instance *pinstance,
2355 u8 shutdown_type,
2356 u8 target_state
2357)
2358{
2359 struct pmcraid_cmd *reset_cmd = NULL;
2360 unsigned long lock_flags;
2361 int reset = 1;
2362
2363 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2364
2365 if (pinstance->ioa_reset_in_progress) {
2366 pmcraid_info("reset_reload: reset is already in progress\n");
2367
2368 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2369
2370 wait_event(pinstance->reset_wait_q,
2371 !pinstance->ioa_reset_in_progress);
2372
2373 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2374
2375 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2376 spin_unlock_irqrestore(pinstance->host->host_lock,
2377 lock_flags);
2378 pmcraid_info("reset_reload: IOA is dead\n");
2379 return reset;
2380 } else if (pinstance->ioa_state == target_state) {
2381 reset = 0;
2382 }
2383 }
2384
2385 if (reset) {
2386 pmcraid_info("reset_reload: proceeding with reset\n");
2387 scsi_block_requests(pinstance->host);
2388 reset_cmd = pmcraid_get_free_cmd(pinstance);
2389
2390 if (reset_cmd == NULL) {
2391 pmcraid_err("no free cmnd for reset_reload\n");
2392 spin_unlock_irqrestore(pinstance->host->host_lock,
2393 lock_flags);
2394 return reset;
2395 }
2396
2397 if (shutdown_type == SHUTDOWN_NORMAL)
2398 pinstance->ioa_bringdown = 1;
2399
2400 pinstance->ioa_shutdown_type = shutdown_type;
2401 pinstance->reset_cmd = reset_cmd;
2402 pinstance->force_ioa_reset = reset;
2403 pmcraid_info("reset_reload: initiating reset\n");
2404 pmcraid_ioa_reset(reset_cmd);
2405 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2406 pmcraid_info("reset_reload: waiting for reset to complete\n");
2407 wait_event(pinstance->reset_wait_q,
2408 !pinstance->ioa_reset_in_progress);
2409
2410 pmcraid_info("reset_reload: reset is complete !!\n");
2411 scsi_unblock_requests(pinstance->host);
2412 if (pinstance->ioa_state == target_state)
2413 reset = 0;
2414 }
2415
2416 return reset;
2417}
2418
2419/**
2420 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2421 *
2422 * @pinstance: pointer to adapter instance structure
2423 *
2424 * Return Value
2425 * whatever is returned from pmcraid_reset_reload
2426 */
2427static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2428{
2429 return pmcraid_reset_reload(pinstance,
2430 SHUTDOWN_NORMAL,
2431 IOA_STATE_UNKNOWN);
2432}
2433
2434/**
2435 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2436 *
2437 * @pinstance: pointer to adapter instance structure
2438 *
2439 * Return Value
2440 * whatever is returned from pmcraid_reset_reload
2441 */
2442static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2443{
2444 pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2445
2446 return pmcraid_reset_reload(pinstance,
2447 SHUTDOWN_NONE,
2448 IOA_STATE_OPERATIONAL);
2449}
2450
2451/**
2452 * pmcraid_request_sense - Send request sense to a device
2453 * @cmd: pmcraid command struct
2454 *
2455 * This function sends a request sense to a device as a result of a check
2456 * condition. This method re-uses the same command block that failed earlier.
2457 */
2458static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2459{
2460 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2461 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2462
2463 /* allocate DMAable memory for sense buffers */
2464 cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
2465 SCSI_SENSE_BUFFERSIZE,
2466 &cmd->sense_buffer_dma);
2467
2468 if (cmd->sense_buffer == NULL) {
2469 pmcraid_err
2470 ("couldn't allocate sense buffer for request sense\n");
2471 pmcraid_erp_done(cmd);
2472 return;
2473 }
2474
2475 /* re-use the command block */
2476 memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2477 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2478 ioarcb->request_flags0 = (SYNC_COMPLETE |
2479 NO_LINK_DESCS |
2480 INHIBIT_UL_CHECK);
2481 ioarcb->request_type = REQ_TYPE_SCSI;
2482 ioarcb->cdb[0] = REQUEST_SENSE;
2483 ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2484
2485 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2486 offsetof(struct pmcraid_ioarcb,
2487 add_data.u.ioadl[0]));
2488 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2489
2490 ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2491
2492 ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2493 ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2494 ioadl->flags = IOADL_FLAGS_LAST_DESC;
2495
2496 /* request sense might be called as part of error response processing
2497 * which runs in tasklets context. It is possible that mid-layer might
2498 * schedule queuecommand during this time, hence, writting to IOARRIN
2499 * must be protect by host_lock
2500 */
2501 pmcraid_send_cmd(cmd, pmcraid_erp_done,
2502 PMCRAID_REQUEST_SENSE_TIMEOUT,
2503 pmcraid_timeout_handler);
2504}
2505
2506/**
2507 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2508 * @cmd: command that failed
2509 * @sense: true if request_sense is required after cancel all
2510 *
2511 * This function sends a cancel all to a device to clear the queue.
2512 */
2513static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
2514{
2515 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2516 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2517 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2518 void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
2519 : pmcraid_request_sense;
2520
2521 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2522 ioarcb->request_flags0 = SYNC_OVERRIDE;
2523 ioarcb->request_type = REQ_TYPE_IOACMD;
2524 ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2525
2526 if (RES_IS_GSCSI(res->cfg_entry))
2527 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2528
2529 ioarcb->ioadl_bus_addr = 0;
2530 ioarcb->ioadl_length = 0;
2531 ioarcb->data_transfer_length = 0;
2532 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
2533
2534 /* writing to IOARRIN must be protected by host_lock, as mid-layer
2535 * schedule queuecommand while we are doing this
2536 */
2537 pmcraid_send_cmd(cmd, cmd_done,
2538 PMCRAID_REQUEST_SENSE_TIMEOUT,
2539 pmcraid_timeout_handler);
2540}
2541
2542/**
2543 * pmcraid_frame_auto_sense: frame fixed format sense information
2544 *
2545 * @cmd: pointer to failing command block
2546 *
2547 * Return value
2548 * none
2549 */
2550static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2551{
2552 u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2553 struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2554 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2555 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2556 u32 failing_lba = 0;
2557
2558 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2559 cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2560
2561 if (RES_IS_VSET(res->cfg_entry) &&
2562 ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2563 ioasa->u.vset.failing_lba_hi != 0) {
2564
2565 sense_buf[0] = 0x72;
2566 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2567 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2568 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2569
2570 sense_buf[7] = 12;
2571 sense_buf[8] = 0;
2572 sense_buf[9] = 0x0A;
2573 sense_buf[10] = 0x80;
2574
2575 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2576
2577 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2578 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2579 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2580 sense_buf[15] = failing_lba & 0x000000ff;
2581
2582 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2583
2584 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2585 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2586 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2587 sense_buf[19] = failing_lba & 0x000000ff;
2588 } else {
2589 sense_buf[0] = 0x70;
2590 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2591 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2592 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2593
2594 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2595 if (RES_IS_VSET(res->cfg_entry))
2596 failing_lba =
2597 le32_to_cpu(ioasa->u.
2598 vset.failing_lba_lo);
2599 sense_buf[0] |= 0x80;
2600 sense_buf[3] = (failing_lba >> 24) & 0xff;
2601 sense_buf[4] = (failing_lba >> 16) & 0xff;
2602 sense_buf[5] = (failing_lba >> 8) & 0xff;
2603 sense_buf[6] = failing_lba & 0xff;
2604 }
2605
2606 sense_buf[7] = 6; /* additional length */
2607 }
2608}
2609
2610/**
2611 * pmcraid_error_handler - Error response handlers for a SCSI op
2612 * @cmd: pointer to pmcraid_cmd that has failed
2613 *
2614 * This function determines whether or not to initiate ERP on the affected
2615 * device. This is called from a tasklet, which doesn't hold any locks.
2616 *
2617 * Return value:
2618 * 0 it caller can complete the request, otherwise 1 where in error
2619 * handler itself completes the request and returns the command block
2620 * back to free-pool
2621 */
2622static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2623{
2624 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2625 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2626 struct pmcraid_instance *pinstance = cmd->drv_inst;
2627 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2628 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2629 u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2630 u32 sense_copied = 0;
2631
2632 if (!res) {
2633 pmcraid_info("resource pointer is NULL\n");
2634 return 0;
2635 }
2636
2637 /* If this was a SCSI read/write command keep count of errors */
2638 if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2639 atomic_inc(&res->read_failures);
2640 else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2641 atomic_inc(&res->write_failures);
2642
2643 if (!RES_IS_GSCSI(res->cfg_entry) &&
2644 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2645 pmcraid_frame_auto_sense(cmd);
2646 }
2647
2648 /* Log IOASC/IOASA information based on user settings */
2649 pmcraid_ioasc_logger(ioasc, cmd);
2650
2651 switch (masked_ioasc) {
2652
2653 case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2654 scsi_cmd->result |= (DID_ABORT << 16);
2655 break;
2656
2657 case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2658 case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2659 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2660 break;
2661
2662 case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2663 res->sync_reqd = 1;
2664 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2665 break;
2666
2667 case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2668 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2669 break;
2670
2671 case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2672 case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2673 if (!res->reset_progress)
2674 scsi_report_bus_reset(pinstance->host,
2675 scsi_cmd->device->channel);
2676 scsi_cmd->result |= (DID_ERROR << 16);
2677 break;
2678
2679 case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2680 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2681 res->sync_reqd = 1;
2682
2683 /* if check_condition is not active return with error otherwise
2684 * get/frame the sense buffer
2685 */
2686 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2687 SAM_STAT_CHECK_CONDITION &&
2688 PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2689 return 0;
2690
2691 /* If we have auto sense data as part of IOASA pass it to
2692 * mid-layer
2693 */
2694 if (ioasa->auto_sense_length != 0) {
2695 short sense_len = ioasa->auto_sense_length;
2696 int data_size = min_t(u16, le16_to_cpu(sense_len),
2697 SCSI_SENSE_BUFFERSIZE);
2698
2699 memcpy(scsi_cmd->sense_buffer,
2700 ioasa->sense_data,
2701 data_size);
2702 sense_copied = 1;
2703 }
2704
2705 if (RES_IS_GSCSI(res->cfg_entry))
2706 pmcraid_cancel_all(cmd, sense_copied);
2707 else if (sense_copied)
2708 pmcraid_erp_done(cmd);
2709 else
2710 pmcraid_request_sense(cmd);
2711
2712 return 1;
2713
2714 case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2715 break;
2716
2717 default:
2718 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2719 scsi_cmd->result |= (DID_ERROR << 16);
2720 break;
2721 }
2722 return 0;
2723}
2724
2725/**
2726 * pmcraid_reset_device - device reset handler functions
2727 *
2728 * @scsi_cmd: scsi command struct
2729 * @modifier: reset modifier indicating the reset sequence to be performed
2730 *
2731 * This function issues a device reset to the affected device.
2732 * A LUN reset will be sent to the device first. If that does
2733 * not work, a target reset will be sent.
2734 *
2735 * Return value:
2736 * SUCCESS / FAILED
2737 */
2738static int pmcraid_reset_device(
2739 struct scsi_cmnd *scsi_cmd,
2740 unsigned long timeout,
2741 u8 modifier
2742)
2743{
2744 struct pmcraid_cmd *cmd;
2745 struct pmcraid_instance *pinstance;
2746 struct pmcraid_resource_entry *res;
2747 struct pmcraid_ioarcb *ioarcb;
2748 unsigned long lock_flags;
2749 u32 ioasc;
2750
2751 pinstance =
2752 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2753 res = scsi_cmd->device->hostdata;
2754
2755 if (!res) {
2756 sdev_printk(KERN_ERR, scsi_cmd->device,
2757 "reset_device: NULL resource pointer\n");
2758 return FAILED;
2759 }
2760
2761 /* If adapter is currently going through reset/reload, return failed.
2762 * This will force the mid-layer to call _eh_bus/host reset, which
2763 * will then go to sleep and wait for the reset to complete
2764 */
2765 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2766 if (pinstance->ioa_reset_in_progress ||
2767 pinstance->ioa_state == IOA_STATE_DEAD) {
2768 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2769 return FAILED;
2770 }
2771
2772 res->reset_progress = 1;
2773 pmcraid_info("Resetting %s resource with addr %x\n",
2774 ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2775 ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2776 le32_to_cpu(res->cfg_entry.resource_address));
2777
2778 /* get a free cmd block */
2779 cmd = pmcraid_get_free_cmd(pinstance);
2780
2781 if (cmd == NULL) {
2782 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2783 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2784 return FAILED;
2785 }
2786
2787 ioarcb = &cmd->ioa_cb->ioarcb;
2788 ioarcb->resource_handle = res->cfg_entry.resource_handle;
2789 ioarcb->request_type = REQ_TYPE_IOACMD;
2790 ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2791
2792 /* Initialize reset modifier bits */
2793 if (modifier)
2794 modifier = ENABLE_RESET_MODIFIER | modifier;
2795
2796 ioarcb->cdb[1] = modifier;
2797
2798 init_completion(&cmd->wait_for_completion);
2799 cmd->completion_req = 1;
2800
2801 pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2802 cmd->ioa_cb->ioarcb.cdb[0],
2803 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2804 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2805
2806 pmcraid_send_cmd(cmd,
2807 pmcraid_internal_done,
2808 timeout,
2809 pmcraid_timeout_handler);
2810
2811 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2812
2813 /* RESET_DEVICE command completes after all pending IOARCBs are
2814 * completed. Once this command is completed, pmcraind_internal_done
2815 * will wake up the 'completion' queue.
2816 */
2817 wait_for_completion(&cmd->wait_for_completion);
2818
2819 /* complete the command here itself and return the command block
2820 * to free list
2821 */
2822 pmcraid_return_cmd(cmd);
2823 res->reset_progress = 0;
2824 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2825
2826 /* set the return value based on the returned ioasc */
2827 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2828}
2829
2830/**
2831 * _pmcraid_io_done - helper for pmcraid_io_done function
2832 *
2833 * @cmd: pointer to pmcraid command struct
2834 * @reslen: residual data length to be set in the ioasa
2835 * @ioasc: ioasc either returned by IOA or set by driver itself.
2836 *
2837 * This function is invoked by pmcraid_io_done to complete mid-layer
2838 * scsi ops.
2839 *
2840 * Return value:
2841 * 0 if caller is required to return it to free_pool. Returns 1 if
2842 * caller need not worry about freeing command block as error handler
2843 * will take care of that.
2844 */
2845
2846static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2847{
2848 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2849 int rc = 0;
2850
2851 scsi_set_resid(scsi_cmd, reslen);
2852
2853 pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2854 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2855 cmd->ioa_cb->ioarcb.cdb[0],
2856 ioasc, scsi_cmd->result);
2857
2858 if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2859 rc = pmcraid_error_handler(cmd);
2860
2861 if (rc == 0) {
2862 scsi_dma_unmap(scsi_cmd);
2863 scsi_cmd->scsi_done(scsi_cmd);
2864 }
2865
2866 return rc;
2867}
2868
2869/**
2870 * pmcraid_io_done - SCSI completion function
2871 *
2872 * @cmd: pointer to pmcraid command struct
2873 *
2874 * This function is invoked by tasklet/mid-layer error handler to completing
2875 * the SCSI ops sent from mid-layer.
2876 *
2877 * Return value
2878 * none
2879 */
2880
2881static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2882{
2883 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2884 u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2885
2886 if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2887 pmcraid_return_cmd(cmd);
2888}
2889
2890/**
2891 * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2892 *
2893 * @cmd: command block of the command to be aborted
2894 *
2895 * Return Value:
2896 * returns pointer to command structure used as cancelling cmd
2897 */
2898static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2899{
2900 struct pmcraid_cmd *cancel_cmd;
2901 struct pmcraid_instance *pinstance;
2902 struct pmcraid_resource_entry *res;
2903
2904 pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2905 res = cmd->scsi_cmd->device->hostdata;
2906
2907 cancel_cmd = pmcraid_get_free_cmd(pinstance);
2908
2909 if (cancel_cmd == NULL) {
2910 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2911 return NULL;
2912 }
2913
2914 pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2915
2916 pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2917 cmd->ioa_cb->ioarcb.cdb[0],
2918 cmd->ioa_cb->ioarcb.response_handle >> 2);
2919
2920 init_completion(&cancel_cmd->wait_for_completion);
2921 cancel_cmd->completion_req = 1;
2922
2923 pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2924 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2925 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2926 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2927
2928 pmcraid_send_cmd(cancel_cmd,
2929 pmcraid_internal_done,
2930 PMCRAID_INTERNAL_TIMEOUT,
2931 pmcraid_timeout_handler);
2932 return cancel_cmd;
2933}
2934
2935/**
2936 * pmcraid_abort_complete - Waits for ABORT TASK completion
2937 *
2938 * @cancel_cmd: command block use as cancelling command
2939 *
2940 * Return Value:
2941 * returns SUCCESS if ABORT TASK has good completion
2942 * otherwise FAILED
2943 */
2944static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2945{
2946 struct pmcraid_resource_entry *res;
2947 u32 ioasc;
2948
2949 wait_for_completion(&cancel_cmd->wait_for_completion);
2950 res = cancel_cmd->res;
2951 cancel_cmd->res = NULL;
2952 ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2953
2954 /* If the abort task is not timed out we will get a Good completion
2955 * as sense_key, otherwise we may get one the following responses
2956 * due to subsequent bus reset or device reset. In case IOASC is
2957 * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2958 */
2959 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
2960 ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
2961 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
2962 res->sync_reqd = 1;
2963 ioasc = 0;
2964 }
2965
2966 /* complete the command here itself */
2967 pmcraid_return_cmd(cancel_cmd);
2968 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2969}
2970
2971/**
2972 * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
2973 *
2974 * @scsi_cmd: scsi command struct given by mid-layer. When this is called
2975 * mid-layer ensures that no other commands are queued. This
2976 * never gets called under interrupt, but a separate eh thread.
2977 *
2978 * Return value:
2979 * SUCCESS / FAILED
2980 */
2981static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
2982{
2983 struct pmcraid_instance *pinstance;
2984 struct pmcraid_cmd *cmd;
2985 struct pmcraid_resource_entry *res;
2986 unsigned long host_lock_flags;
2987 unsigned long pending_lock_flags;
2988 struct pmcraid_cmd *cancel_cmd = NULL;
2989 int cmd_found = 0;
2990 int rc = FAILED;
2991
2992 pinstance =
2993 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2994
2995 scmd_printk(KERN_INFO, scsi_cmd,
2996 "I/O command timed out, aborting it.\n");
2997
2998 res = scsi_cmd->device->hostdata;
2999
3000 if (res == NULL)
3001 return rc;
3002
3003 /* If we are currently going through reset/reload, return failed.
3004 * This will force the mid-layer to eventually call
3005 * pmcraid_eh_host_reset which will then go to sleep and wait for the
3006 * reset to complete
3007 */
3008 spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
3009
3010 if (pinstance->ioa_reset_in_progress ||
3011 pinstance->ioa_state == IOA_STATE_DEAD) {
3012 spin_unlock_irqrestore(pinstance->host->host_lock,
3013 host_lock_flags);
3014 return rc;
3015 }
3016
3017 /* loop over pending cmd list to find cmd corresponding to this
3018 * scsi_cmd. Note that this command might not have been completed
3019 * already. locking: all pending commands are protected with
3020 * pending_pool_lock.
3021 */
3022 spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
3023 list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
3024
3025 if (cmd->scsi_cmd == scsi_cmd) {
3026 cmd_found = 1;
3027 break;
3028 }
3029 }
3030
3031 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3032 pending_lock_flags);
3033
3034 /* If the command to be aborted was given to IOA and still pending with
3035 * it, send ABORT_TASK to abort this and wait for its completion
3036 */
3037 if (cmd_found)
3038 cancel_cmd = pmcraid_abort_cmd(cmd);
3039
3040 spin_unlock_irqrestore(pinstance->host->host_lock,
3041 host_lock_flags);
3042
3043 if (cancel_cmd) {
3044 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3045 rc = pmcraid_abort_complete(cancel_cmd);
3046 }
3047
3048 return cmd_found ? rc : SUCCESS;
3049}
3050
3051/**
3052 * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
3053 *
3054 * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3055 *
3056 * All these routines invokve pmcraid_reset_device with appropriate parameters.
3057 * Since these are called from mid-layer EH thread, no other IO will be queued
3058 * to the resource being reset. However, control path (IOCTL) may be active so
3059 * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3060 * takes care by locking/unlocking host_lock.
3061 *
3062 * Return value
3063 * SUCCESS or FAILED
3064 */
3065static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3066{
3067 scmd_printk(KERN_INFO, scmd,
3068 "resetting device due to an I/O command timeout.\n");
3069 return pmcraid_reset_device(scmd,
3070 PMCRAID_INTERNAL_TIMEOUT,
3071 RESET_DEVICE_LUN);
3072}
3073
3074static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3075{
3076 scmd_printk(KERN_INFO, scmd,
3077 "Doing bus reset due to an I/O command timeout.\n");
3078 return pmcraid_reset_device(scmd,
3079 PMCRAID_RESET_BUS_TIMEOUT,
3080 RESET_DEVICE_BUS);
3081}
3082
3083static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3084{
3085 scmd_printk(KERN_INFO, scmd,
3086 "Doing target reset due to an I/O command timeout.\n");
3087 return pmcraid_reset_device(scmd,
3088 PMCRAID_INTERNAL_TIMEOUT,
3089 RESET_DEVICE_TARGET);
3090}
3091
3092/**
3093 * pmcraid_eh_host_reset_handler - adapter reset handler callback
3094 *
3095 * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3096 *
3097 * Initiates adapter reset to bring it up to operational state
3098 *
3099 * Return value
3100 * SUCCESS or FAILED
3101 */
3102static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3103{
3104 unsigned long interval = 10000; /* 10 seconds interval */
3105 int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3106 struct pmcraid_instance *pinstance =
3107 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3108
3109
3110 /* wait for an additional 150 seconds just in case firmware could come
3111 * up and if it could complete all the pending commands excluding the
3112 * two HCAM (CCN and LDN).
3113 */
3114 while (waits--) {
3115 if (atomic_read(&pinstance->outstanding_cmds) <=
3116 PMCRAID_MAX_HCAM_CMD)
3117 return SUCCESS;
3118 msleep(interval);
3119 }
3120
3121 dev_err(&pinstance->pdev->dev,
3122 "Adapter being reset due to an I/O command timeout.\n");
3123 return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3124}
3125
3126/**
3127 * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3128 * @cmd: pmcraid command struct
3129 * @sgcount: count of scatter-gather elements
3130 *
3131 * Return value
3132 * returns pointer pmcraid_ioadl_desc, initialized to point to internal
3133 * or external IOADLs
3134 */
3135static struct pmcraid_ioadl_desc *
3136pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3137{
3138 struct pmcraid_ioadl_desc *ioadl;
3139 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3140 int ioadl_count = 0;
3141
3142 if (ioarcb->add_cmd_param_length)
3143 ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
3144 ioarcb->ioadl_length =
3145 sizeof(struct pmcraid_ioadl_desc) * sgcount;
3146
3147 if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3148 /* external ioadls start at offset 0x80 from control_block
3149 * structure, re-using 24 out of 27 ioadls part of IOARCB.
3150 * It is necessary to indicate to firmware that driver is
3151 * using ioadls to be treated as external to IOARCB.
3152 */
3153 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
3154 ioarcb->ioadl_bus_addr =
3155 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3156 offsetof(struct pmcraid_ioarcb,
3157 add_data.u.ioadl[3]));
3158 ioadl = &ioarcb->add_data.u.ioadl[3];
3159 } else {
3160 ioarcb->ioadl_bus_addr =
3161 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3162 offsetof(struct pmcraid_ioarcb,
3163 add_data.u.ioadl[ioadl_count]));
3164
3165 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3166 ioarcb->ioarcb_bus_addr |=
3167 DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
3168 }
3169
3170 return ioadl;
3171}
3172
3173/**
3174 * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3175 * @pinstance: pointer to adapter instance structure
3176 * @cmd: pmcraid command struct
3177 *
3178 * This function is invoked by queuecommand entry point while sending a command
3179 * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3180 *
3181 * Return value:
3182 * 0 on success or -1 on failure
3183 */
3184static int pmcraid_build_ioadl(
3185 struct pmcraid_instance *pinstance,
3186 struct pmcraid_cmd *cmd
3187)
3188{
3189 int i, nseg;
3190 struct scatterlist *sglist;
3191
3192 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3193 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3194 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
3195
3196 u32 length = scsi_bufflen(scsi_cmd);
3197
3198 if (!length)
3199 return 0;
3200
3201 nseg = scsi_dma_map(scsi_cmd);
3202
3203 if (nseg < 0) {
3204 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3205 return -1;
3206 } else if (nseg > PMCRAID_MAX_IOADLS) {
3207 scsi_dma_unmap(scsi_cmd);
3208 scmd_printk(KERN_ERR, scsi_cmd,
3209 "sg count is (%d) more than allowed!\n", nseg);
3210 return -1;
3211 }
3212
3213 /* Initialize IOARCB data transfer length fields */
3214 if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3215 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3216
3217 ioarcb->request_flags0 |= NO_LINK_DESCS;
3218 ioarcb->data_transfer_length = cpu_to_le32(length);
3219 ioadl = pmcraid_init_ioadls(cmd, nseg);
3220
3221 /* Initialize IOADL descriptor addresses */
3222 scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3223 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3224 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3225 ioadl[i].flags = 0;
3226 }
3227 /* setup last descriptor */
3228 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3229
3230 return 0;
3231}
3232
3233/**
3234 * pmcraid_free_sglist - Frees an allocated SG buffer list
3235 * @sglist: scatter/gather list pointer
3236 *
3237 * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3238 *
3239 * Return value:
3240 * none
3241 */
3242static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3243{
3244 int i;
3245
3246 for (i = 0; i < sglist->num_sg; i++)
3247 __free_pages(sg_page(&(sglist->scatterlist[i])),
3248 sglist->order);
3249
3250 kfree(sglist);
3251}
3252
3253/**
3254 * pmcraid_alloc_sglist - Allocates memory for a SG list
3255 * @buflen: buffer length
3256 *
3257 * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3258 * list.
3259 *
3260 * Return value
3261 * pointer to sglist / NULL on failure
3262 */
3263static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3264{
3265 struct pmcraid_sglist *sglist;
3266 struct scatterlist *scatterlist;
3267 struct page *page;
3268 int num_elem, i, j;
3269 int sg_size;
3270 int order;
3271 int bsize_elem;
3272
3273 sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3274 order = (sg_size > 0) ? get_order(sg_size) : 0;
3275 bsize_elem = PAGE_SIZE * (1 << order);
3276
3277 /* Determine the actual number of sg entries needed */
3278 if (buflen % bsize_elem)
3279 num_elem = (buflen / bsize_elem) + 1;
3280 else
3281 num_elem = buflen / bsize_elem;
3282
3283 /* Allocate a scatter/gather list for the DMA */
3284 sglist = kzalloc(sizeof(struct pmcraid_sglist) +
3285 (sizeof(struct scatterlist) * (num_elem - 1)),
3286 GFP_KERNEL);
3287
3288 if (sglist == NULL)
3289 return NULL;
3290
3291 scatterlist = sglist->scatterlist;
3292 sg_init_table(scatterlist, num_elem);
3293 sglist->order = order;
3294 sglist->num_sg = num_elem;
3295 sg_size = buflen;
3296
3297 for (i = 0; i < num_elem; i++) {
3298 page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
3299 if (!page) {
3300 for (j = i - 1; j >= 0; j--)
3301 __free_pages(sg_page(&scatterlist[j]), order);
3302 kfree(sglist);
3303 return NULL;
3304 }
3305
3306 sg_set_page(&scatterlist[i], page,
3307 sg_size < bsize_elem ? sg_size : bsize_elem, 0);
3308 sg_size -= bsize_elem;
3309 }
3310
3311 return sglist;
3312}
3313
3314/**
3315 * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3316 * @sglist: scatter/gather list pointer
3317 * @buffer: buffer pointer
3318 * @len: buffer length
3319 * @direction: data transfer direction
3320 *
3321 * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3322 *
3323 * Return value:
3324 * 0 on success / other on failure
3325 */
3326static int pmcraid_copy_sglist(
3327 struct pmcraid_sglist *sglist,
3328 unsigned long buffer,
3329 u32 len,
3330 int direction
3331)
3332{
3333 struct scatterlist *scatterlist;
3334 void *kaddr;
3335 int bsize_elem;
3336 int i;
3337 int rc = 0;
3338
3339 /* Determine the actual number of bytes per element */
3340 bsize_elem = PAGE_SIZE * (1 << sglist->order);
3341
3342 scatterlist = sglist->scatterlist;
3343
3344 for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
3345 struct page *page = sg_page(&scatterlist[i]);
3346
3347 kaddr = kmap(page);
3348 if (direction == DMA_TO_DEVICE)
3349 rc = __copy_from_user(kaddr,
3350 (void *)buffer,
3351 bsize_elem);
3352 else
3353 rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
3354
3355 kunmap(page);
3356
3357 if (rc) {
3358 pmcraid_err("failed to copy user data into sg list\n");
3359 return -EFAULT;
3360 }
3361
3362 scatterlist[i].length = bsize_elem;
3363 }
3364
3365 if (len % bsize_elem) {
3366 struct page *page = sg_page(&scatterlist[i]);
3367
3368 kaddr = kmap(page);
3369
3370 if (direction == DMA_TO_DEVICE)
3371 rc = __copy_from_user(kaddr,
3372 (void *)buffer,
3373 len % bsize_elem);
3374 else
3375 rc = __copy_to_user((void *)buffer,
3376 kaddr,
3377 len % bsize_elem);
3378
3379 kunmap(page);
3380
3381 scatterlist[i].length = len % bsize_elem;
3382 }
3383
3384 if (rc) {
3385 pmcraid_err("failed to copy user data into sg list\n");
3386 rc = -EFAULT;
3387 }
3388
3389 return rc;
3390}
3391
3392/**
3393 * pmcraid_queuecommand - Queue a mid-layer request
3394 * @scsi_cmd: scsi command struct
3395 * @done: done function
3396 *
3397 * This function queues a request generated by the mid-layer. Midlayer calls
3398 * this routine within host->lock. Some of the functions called by queuecommand
3399 * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3400 *
3401 * Return value:
3402 * 0 on success
3403 * SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3404 * SCSI_MLQUEUE_HOST_BUSY if host is busy
3405 */
3406static int pmcraid_queuecommand_lck(
3407 struct scsi_cmnd *scsi_cmd,
3408 void (*done) (struct scsi_cmnd *)
3409)
3410{
3411 struct pmcraid_instance *pinstance;
3412 struct pmcraid_resource_entry *res;
3413 struct pmcraid_ioarcb *ioarcb;
3414 struct pmcraid_cmd *cmd;
3415 u32 fw_version;
3416 int rc = 0;
3417
3418 pinstance =
3419 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3420 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3421 scsi_cmd->scsi_done = done;
3422 res = scsi_cmd->device->hostdata;
3423 scsi_cmd->result = (DID_OK << 16);
3424
3425 /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3426 * the command
3427 */
3428 if (pinstance->ioa_state == IOA_STATE_DEAD) {
3429 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3430 scsi_cmd->result = (DID_NO_CONNECT << 16);
3431 scsi_cmd->scsi_done(scsi_cmd);
3432 return 0;
3433 }
3434
3435 /* If IOA reset is in progress, can't queue the commands */
3436 if (pinstance->ioa_reset_in_progress)
3437 return SCSI_MLQUEUE_HOST_BUSY;
3438
3439 /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3440 * the command here itself with success return
3441 */
3442 if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3443 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3444 scsi_cmd->scsi_done(scsi_cmd);
3445 return 0;
3446 }
3447
3448 /* initialize the command and IOARCB to be sent to IOA */
3449 cmd = pmcraid_get_free_cmd(pinstance);
3450
3451 if (cmd == NULL) {
3452 pmcraid_err("free command block is not available\n");
3453 return SCSI_MLQUEUE_HOST_BUSY;
3454 }
3455
3456 cmd->scsi_cmd = scsi_cmd;
3457 ioarcb = &(cmd->ioa_cb->ioarcb);
3458 memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3459 ioarcb->resource_handle = res->cfg_entry.resource_handle;
3460 ioarcb->request_type = REQ_TYPE_SCSI;
3461
3462 /* set hrrq number where the IOA should respond to. Note that all cmds
3463 * generated internally uses hrrq_id 0, exception to this is the cmd
3464 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3465 * hrrq_id assigned here in queuecommand
3466 */
3467 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3468 pinstance->num_hrrq;
3469 cmd->cmd_done = pmcraid_io_done;
3470
3471 if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3472 if (scsi_cmd->underflow == 0)
3473 ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3474
3475 if (res->sync_reqd) {
3476 ioarcb->request_flags0 |= SYNC_COMPLETE;
3477 res->sync_reqd = 0;
3478 }
3479
3480 ioarcb->request_flags0 |= NO_LINK_DESCS;
3481
3482 if (scsi_cmd->flags & SCMD_TAGGED)
3483 ioarcb->request_flags1 |= TASK_TAG_SIMPLE;
3484
3485 if (RES_IS_GSCSI(res->cfg_entry))
3486 ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3487 }
3488
3489 rc = pmcraid_build_ioadl(pinstance, cmd);
3490
3491 pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3492 le32_to_cpu(ioarcb->response_handle) >> 2,
3493 scsi_cmd->cmnd[0], pinstance->host->unique_id,
3494 RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3495 PMCRAID_PHYS_BUS_ID,
3496 RES_IS_VSET(res->cfg_entry) ?
3497 (fw_version <= PMCRAID_FW_VERSION_1 ?
3498 res->cfg_entry.unique_flags1 :
3499 res->cfg_entry.array_id & 0xFF) :
3500 RES_TARGET(res->cfg_entry.resource_address),
3501 RES_LUN(res->cfg_entry.resource_address));
3502
3503 if (likely(rc == 0)) {
3504 _pmcraid_fire_command(cmd);
3505 } else {
3506 pmcraid_err("queuecommand could not build ioadl\n");
3507 pmcraid_return_cmd(cmd);
3508 rc = SCSI_MLQUEUE_HOST_BUSY;
3509 }
3510
3511 return rc;
3512}
3513
3514static DEF_SCSI_QCMD(pmcraid_queuecommand)
3515
3516/**
3517 * pmcraid_open -char node "open" entry, allowed only users with admin access
3518 */
3519static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3520{
3521 struct pmcraid_instance *pinstance;
3522
3523 if (!capable(CAP_SYS_ADMIN))
3524 return -EACCES;
3525
3526 /* Populate adapter instance * pointer for use by ioctl */
3527 pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3528 filep->private_data = pinstance;
3529
3530 return 0;
3531}
3532
3533/**
3534 * pmcraid_fasync - Async notifier registration from applications
3535 *
3536 * This function adds the calling process to a driver global queue. When an
3537 * event occurs, SIGIO will be sent to all processes in this queue.
3538 */
3539static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3540{
3541 struct pmcraid_instance *pinstance;
3542 int rc;
3543
3544 pinstance = filep->private_data;
3545 mutex_lock(&pinstance->aen_queue_lock);
3546 rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3547 mutex_unlock(&pinstance->aen_queue_lock);
3548
3549 return rc;
3550}
3551
3552
3553/**
3554 * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3555 * commands sent over IOCTL interface
3556 *
3557 * @cmd : pointer to struct pmcraid_cmd
3558 * @buflen : length of the request buffer
3559 * @direction : data transfer direction
3560 *
3561 * Return value
3562 * 0 on success, non-zero error code on failure
3563 */
3564static int pmcraid_build_passthrough_ioadls(
3565 struct pmcraid_cmd *cmd,
3566 int buflen,
3567 int direction
3568)
3569{
3570 struct pmcraid_sglist *sglist = NULL;
3571 struct scatterlist *sg = NULL;
3572 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3573 struct pmcraid_ioadl_desc *ioadl;
3574 int i;
3575
3576 sglist = pmcraid_alloc_sglist(buflen);
3577
3578 if (!sglist) {
3579 pmcraid_err("can't allocate memory for passthrough SGls\n");
3580 return -ENOMEM;
3581 }
3582
3583 sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
3584 sglist->scatterlist,
3585 sglist->num_sg, direction);
3586
3587 if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3588 dev_err(&cmd->drv_inst->pdev->dev,
3589 "Failed to map passthrough buffer!\n");
3590 pmcraid_free_sglist(sglist);
3591 return -EIO;
3592 }
3593
3594 cmd->sglist = sglist;
3595 ioarcb->request_flags0 |= NO_LINK_DESCS;
3596
3597 ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3598
3599 /* Initialize IOADL descriptor addresses */
3600 for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3601 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3602 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3603 ioadl[i].flags = 0;
3604 }
3605
3606 /* setup the last descriptor */
3607 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3608
3609 return 0;
3610}
3611
3612
3613/**
3614 * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3615 *
3616 * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3617 * @buflen: size of the request buffer
3618 * @direction: data transfer direction
3619 *
3620 * Return value
3621 * 0 on success, non-zero error code on failure
3622 */
3623static void pmcraid_release_passthrough_ioadls(
3624 struct pmcraid_cmd *cmd,
3625 int buflen,
3626 int direction
3627)
3628{
3629 struct pmcraid_sglist *sglist = cmd->sglist;
3630
3631 if (buflen > 0) {
3632 pci_unmap_sg(cmd->drv_inst->pdev,
3633 sglist->scatterlist,
3634 sglist->num_sg,
3635 direction);
3636 pmcraid_free_sglist(sglist);
3637 cmd->sglist = NULL;
3638 }
3639}
3640
3641/**
3642 * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3643 *
3644 * @pinstance: pointer to adapter instance structure
3645 * @cmd: ioctl code
3646 * @arg: pointer to pmcraid_passthrough_buffer user buffer
3647 *
3648 * Return value
3649 * 0 on success, non-zero error code on failure
3650 */
3651static long pmcraid_ioctl_passthrough(
3652 struct pmcraid_instance *pinstance,
3653 unsigned int ioctl_cmd,
3654 unsigned int buflen,
3655 unsigned long arg
3656)
3657{
3658 struct pmcraid_passthrough_ioctl_buffer *buffer;
3659 struct pmcraid_ioarcb *ioarcb;
3660 struct pmcraid_cmd *cmd;
3661 struct pmcraid_cmd *cancel_cmd;
3662 unsigned long request_buffer;
3663 unsigned long request_offset;
3664 unsigned long lock_flags;
3665 void *ioasa;
3666 u32 ioasc;
3667 int request_size;
3668 int buffer_size;
3669 u8 access, direction;
3670 int rc = 0;
3671
3672 /* If IOA reset is in progress, wait 10 secs for reset to complete */
3673 if (pinstance->ioa_reset_in_progress) {
3674 rc = wait_event_interruptible_timeout(
3675 pinstance->reset_wait_q,
3676 !pinstance->ioa_reset_in_progress,
3677 msecs_to_jiffies(10000));
3678
3679 if (!rc)
3680 return -ETIMEDOUT;
3681 else if (rc < 0)
3682 return -ERESTARTSYS;
3683 }
3684
3685 /* If adapter is not in operational state, return error */
3686 if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3687 pmcraid_err("IOA is not operational\n");
3688 return -ENOTTY;
3689 }
3690
3691 buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3692 buffer = kmalloc(buffer_size, GFP_KERNEL);
3693
3694 if (!buffer) {
3695 pmcraid_err("no memory for passthrough buffer\n");
3696 return -ENOMEM;
3697 }
3698
3699 request_offset =
3700 offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3701
3702 request_buffer = arg + request_offset;
3703
3704 rc = __copy_from_user(buffer,
3705 (struct pmcraid_passthrough_ioctl_buffer *) arg,
3706 sizeof(struct pmcraid_passthrough_ioctl_buffer));
3707
3708 ioasa =
3709 (void *)(arg +
3710 offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
3711
3712 if (rc) {
3713 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3714 rc = -EFAULT;
3715 goto out_free_buffer;
3716 }
3717
3718 request_size = buffer->ioarcb.data_transfer_length;
3719
3720 if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3721 access = VERIFY_READ;
3722 direction = DMA_TO_DEVICE;
3723 } else {
3724 access = VERIFY_WRITE;
3725 direction = DMA_FROM_DEVICE;
3726 }
3727
3728 if (request_size > 0) {
3729 rc = access_ok(access, arg, request_offset + request_size);
3730
3731 if (!rc) {
3732 rc = -EFAULT;
3733 goto out_free_buffer;
3734 }
3735 } else if (request_size < 0) {
3736 rc = -EINVAL;
3737 goto out_free_buffer;
3738 }
3739
3740 /* check if we have any additional command parameters */
3741 if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
3742 rc = -EINVAL;
3743 goto out_free_buffer;
3744 }
3745
3746 cmd = pmcraid_get_free_cmd(pinstance);
3747
3748 if (!cmd) {
3749 pmcraid_err("free command block is not available\n");
3750 rc = -ENOMEM;
3751 goto out_free_buffer;
3752 }
3753
3754 cmd->scsi_cmd = NULL;
3755 ioarcb = &(cmd->ioa_cb->ioarcb);
3756
3757 /* Copy the user-provided IOARCB stuff field by field */
3758 ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3759 ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3760 ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3761 ioarcb->request_type = buffer->ioarcb.request_type;
3762 ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3763 ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3764 memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3765
3766 if (buffer->ioarcb.add_cmd_param_length) {
3767 ioarcb->add_cmd_param_length =
3768 buffer->ioarcb.add_cmd_param_length;
3769 ioarcb->add_cmd_param_offset =
3770 buffer->ioarcb.add_cmd_param_offset;
3771 memcpy(ioarcb->add_data.u.add_cmd_params,
3772 buffer->ioarcb.add_data.u.add_cmd_params,
3773 buffer->ioarcb.add_cmd_param_length);
3774 }
3775
3776 /* set hrrq number where the IOA should respond to. Note that all cmds
3777 * generated internally uses hrrq_id 0, exception to this is the cmd
3778 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3779 * hrrq_id assigned here in queuecommand
3780 */
3781 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3782 pinstance->num_hrrq;
3783
3784 if (request_size) {
3785 rc = pmcraid_build_passthrough_ioadls(cmd,
3786 request_size,
3787 direction);
3788 if (rc) {
3789 pmcraid_err("couldn't build passthrough ioadls\n");
3790 goto out_free_cmd;
3791 }
3792 } else if (request_size < 0) {
3793 rc = -EINVAL;
3794 goto out_free_cmd;
3795 }
3796
3797 /* If data is being written into the device, copy the data from user
3798 * buffers
3799 */
3800 if (direction == DMA_TO_DEVICE && request_size > 0) {
3801 rc = pmcraid_copy_sglist(cmd->sglist,
3802 request_buffer,
3803 request_size,
3804 direction);
3805 if (rc) {
3806 pmcraid_err("failed to copy user buffer\n");
3807 goto out_free_sglist;
3808 }
3809 }
3810
3811 /* passthrough ioctl is a blocking command so, put the user to sleep
3812 * until timeout. Note that a timeout value of 0 means, do timeout.
3813 */
3814 cmd->cmd_done = pmcraid_internal_done;
3815 init_completion(&cmd->wait_for_completion);
3816 cmd->completion_req = 1;
3817
3818 pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3819 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3820 cmd->ioa_cb->ioarcb.cdb[0],
3821 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3822
3823 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3824 _pmcraid_fire_command(cmd);
3825 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3826
3827 /* NOTE ! Remove the below line once abort_task is implemented
3828 * in firmware. This line disables ioctl command timeout handling logic
3829 * similar to IO command timeout handling, making ioctl commands to wait
3830 * until the command completion regardless of timeout value specified in
3831 * ioarcb
3832 */
3833 buffer->ioarcb.cmd_timeout = 0;
3834
3835 /* If command timeout is specified put caller to wait till that time,
3836 * otherwise it would be blocking wait. If command gets timed out, it
3837 * will be aborted.
3838 */
3839 if (buffer->ioarcb.cmd_timeout == 0) {
3840 wait_for_completion(&cmd->wait_for_completion);
3841 } else if (!wait_for_completion_timeout(
3842 &cmd->wait_for_completion,
3843 msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
3844
3845 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3846 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
3847 cmd->ioa_cb->ioarcb.cdb[0]);
3848
3849 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3850 cancel_cmd = pmcraid_abort_cmd(cmd);
3851 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3852
3853 if (cancel_cmd) {
3854 wait_for_completion(&cancel_cmd->wait_for_completion);
3855 ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
3856 pmcraid_return_cmd(cancel_cmd);
3857
3858 /* if abort task couldn't find the command i.e it got
3859 * completed prior to aborting, return good completion.
3860 * if command got aborted successfully or there was IOA
3861 * reset due to abort task itself getting timedout then
3862 * return -ETIMEDOUT
3863 */
3864 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3865 PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3866 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3867 rc = -ETIMEDOUT;
3868 goto out_handle_response;
3869 }
3870 }
3871
3872 /* no command block for abort task or abort task failed to abort
3873 * the IOARCB, then wait for 150 more seconds and initiate reset
3874 * sequence after timeout
3875 */
3876 if (!wait_for_completion_timeout(
3877 &cmd->wait_for_completion,
3878 msecs_to_jiffies(150 * 1000))) {
3879 pmcraid_reset_bringup(cmd->drv_inst);
3880 rc = -ETIMEDOUT;
3881 }
3882 }
3883
3884out_handle_response:
3885 /* copy entire IOASA buffer and return IOCTL success.
3886 * If copying IOASA to user-buffer fails, return
3887 * EFAULT
3888 */
3889 if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3890 sizeof(struct pmcraid_ioasa))) {
3891 pmcraid_err("failed to copy ioasa buffer to user\n");
3892 rc = -EFAULT;
3893 }
3894
3895 /* If the data transfer was from device, copy the data onto user
3896 * buffers
3897 */
3898 else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3899 rc = pmcraid_copy_sglist(cmd->sglist,
3900 request_buffer,
3901 request_size,
3902 direction);
3903 if (rc) {
3904 pmcraid_err("failed to copy user buffer\n");
3905 rc = -EFAULT;
3906 }
3907 }
3908
3909out_free_sglist:
3910 pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3911
3912out_free_cmd:
3913 pmcraid_return_cmd(cmd);
3914
3915out_free_buffer:
3916 kfree(buffer);
3917
3918 return rc;
3919}
3920
3921
3922
3923
3924/**
3925 * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
3926 *
3927 * @pinstance: pointer to adapter instance structure
3928 * @cmd: ioctl command passed in
3929 * @buflen: length of user_buffer
3930 * @user_buffer: user buffer pointer
3931 *
3932 * Return Value
3933 * 0 in case of success, otherwise appropriate error code
3934 */
3935static long pmcraid_ioctl_driver(
3936 struct pmcraid_instance *pinstance,
3937 unsigned int cmd,
3938 unsigned int buflen,
3939 void __user *user_buffer
3940)
3941{
3942 int rc = -ENOSYS;
3943
3944 if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
3945 pmcraid_err("ioctl_driver: access fault in request buffer\n");
3946 return -EFAULT;
3947 }
3948
3949 switch (cmd) {
3950 case PMCRAID_IOCTL_RESET_ADAPTER:
3951 pmcraid_reset_bringup(pinstance);
3952 rc = 0;
3953 break;
3954
3955 default:
3956 break;
3957 }
3958
3959 return rc;
3960}
3961
3962/**
3963 * pmcraid_check_ioctl_buffer - check for proper access to user buffer
3964 *
3965 * @cmd: ioctl command
3966 * @arg: user buffer
3967 * @hdr: pointer to kernel memory for pmcraid_ioctl_header
3968 *
3969 * Return Value
3970 * negetive error code if there are access issues, otherwise zero.
3971 * Upon success, returns ioctl header copied out of user buffer.
3972 */
3973
3974static int pmcraid_check_ioctl_buffer(
3975 int cmd,
3976 void __user *arg,
3977 struct pmcraid_ioctl_header *hdr
3978)
3979{
3980 int rc = 0;
3981 int access = VERIFY_READ;
3982
3983 if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
3984 pmcraid_err("couldn't copy ioctl header from user buffer\n");
3985 return -EFAULT;
3986 }
3987
3988 /* check for valid driver signature */
3989 rc = memcmp(hdr->signature,
3990 PMCRAID_IOCTL_SIGNATURE,
3991 sizeof(hdr->signature));
3992 if (rc) {
3993 pmcraid_err("signature verification failed\n");
3994 return -EINVAL;
3995 }
3996
3997 /* check for appropriate buffer access */
3998 if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
3999 access = VERIFY_WRITE;
4000
4001 rc = access_ok(access,
4002 (arg + sizeof(struct pmcraid_ioctl_header)),
4003 hdr->buffer_length);
4004 if (!rc) {
4005 pmcraid_err("access failed for user buffer of size %d\n",
4006 hdr->buffer_length);
4007 return -EFAULT;
4008 }
4009
4010 return 0;
4011}
4012
4013/**
4014 * pmcraid_ioctl - char node ioctl entry point
4015 */
4016static long pmcraid_chr_ioctl(
4017 struct file *filep,
4018 unsigned int cmd,
4019 unsigned long arg
4020)
4021{
4022 struct pmcraid_instance *pinstance = NULL;
4023 struct pmcraid_ioctl_header *hdr = NULL;
4024 int retval = -ENOTTY;
4025
4026 hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
4027
4028 if (!hdr) {
4029 pmcraid_err("failed to allocate memory for ioctl header\n");
4030 return -ENOMEM;
4031 }
4032
4033 retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
4034
4035 if (retval) {
4036 pmcraid_info("chr_ioctl: header check failed\n");
4037 kfree(hdr);
4038 return retval;
4039 }
4040
4041 pinstance = filep->private_data;
4042
4043 if (!pinstance) {
4044 pmcraid_info("adapter instance is not found\n");
4045 kfree(hdr);
4046 return -ENOTTY;
4047 }
4048
4049 switch (_IOC_TYPE(cmd)) {
4050
4051 case PMCRAID_PASSTHROUGH_IOCTL:
4052 /* If ioctl code is to download microcode, we need to block
4053 * mid-layer requests.
4054 */
4055 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4056 scsi_block_requests(pinstance->host);
4057
4058 retval = pmcraid_ioctl_passthrough(pinstance,
4059 cmd,
4060 hdr->buffer_length,
4061 arg);
4062
4063 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4064 scsi_unblock_requests(pinstance->host);
4065 break;
4066
4067 case PMCRAID_DRIVER_IOCTL:
4068 arg += sizeof(struct pmcraid_ioctl_header);
4069 retval = pmcraid_ioctl_driver(pinstance,
4070 cmd,
4071 hdr->buffer_length,
4072 (void __user *)arg);
4073 break;
4074
4075 default:
4076 retval = -ENOTTY;
4077 break;
4078 }
4079
4080 kfree(hdr);
4081
4082 return retval;
4083}
4084
4085/**
4086 * File operations structure for management interface
4087 */
4088static const struct file_operations pmcraid_fops = {
4089 .owner = THIS_MODULE,
4090 .open = pmcraid_chr_open,
4091 .fasync = pmcraid_chr_fasync,
4092 .unlocked_ioctl = pmcraid_chr_ioctl,
4093#ifdef CONFIG_COMPAT
4094 .compat_ioctl = pmcraid_chr_ioctl,
4095#endif
4096 .llseek = noop_llseek,
4097};
4098
4099
4100
4101
4102/**
4103 * pmcraid_show_log_level - Display adapter's error logging level
4104 * @dev: class device struct
4105 * @buf: buffer
4106 *
4107 * Return value:
4108 * number of bytes printed to buffer
4109 */
4110static ssize_t pmcraid_show_log_level(
4111 struct device *dev,
4112 struct device_attribute *attr,
4113 char *buf)
4114{
4115 struct Scsi_Host *shost = class_to_shost(dev);
4116 struct pmcraid_instance *pinstance =
4117 (struct pmcraid_instance *)shost->hostdata;
4118 return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
4119}
4120
4121/**
4122 * pmcraid_store_log_level - Change the adapter's error logging level
4123 * @dev: class device struct
4124 * @buf: buffer
4125 * @count: not used
4126 *
4127 * Return value:
4128 * number of bytes printed to buffer
4129 */
4130static ssize_t pmcraid_store_log_level(
4131 struct device *dev,
4132 struct device_attribute *attr,
4133 const char *buf,
4134 size_t count
4135)
4136{
4137 struct Scsi_Host *shost;
4138 struct pmcraid_instance *pinstance;
4139 u8 val;
4140
4141 if (kstrtou8(buf, 10, &val))
4142 return -EINVAL;
4143 /* log-level should be from 0 to 2 */
4144 if (val > 2)
4145 return -EINVAL;
4146
4147 shost = class_to_shost(dev);
4148 pinstance = (struct pmcraid_instance *)shost->hostdata;
4149 pinstance->current_log_level = val;
4150
4151 return strlen(buf);
4152}
4153
4154static struct device_attribute pmcraid_log_level_attr = {
4155 .attr = {
4156 .name = "log_level",
4157 .mode = S_IRUGO | S_IWUSR,
4158 },
4159 .show = pmcraid_show_log_level,
4160 .store = pmcraid_store_log_level,
4161};
4162
4163/**
4164 * pmcraid_show_drv_version - Display driver version
4165 * @dev: class device struct
4166 * @buf: buffer
4167 *
4168 * Return value:
4169 * number of bytes printed to buffer
4170 */
4171static ssize_t pmcraid_show_drv_version(
4172 struct device *dev,
4173 struct device_attribute *attr,
4174 char *buf
4175)
4176{
4177 return snprintf(buf, PAGE_SIZE, "version: %s\n",
4178 PMCRAID_DRIVER_VERSION);
4179}
4180
4181static struct device_attribute pmcraid_driver_version_attr = {
4182 .attr = {
4183 .name = "drv_version",
4184 .mode = S_IRUGO,
4185 },
4186 .show = pmcraid_show_drv_version,
4187};
4188
4189/**
4190 * pmcraid_show_io_adapter_id - Display driver assigned adapter id
4191 * @dev: class device struct
4192 * @buf: buffer
4193 *
4194 * Return value:
4195 * number of bytes printed to buffer
4196 */
4197static ssize_t pmcraid_show_adapter_id(
4198 struct device *dev,
4199 struct device_attribute *attr,
4200 char *buf
4201)
4202{
4203 struct Scsi_Host *shost = class_to_shost(dev);
4204 struct pmcraid_instance *pinstance =
4205 (struct pmcraid_instance *)shost->hostdata;
4206 u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4207 pinstance->pdev->devfn;
4208 u32 aen_group = pmcraid_event_family.id;
4209
4210 return snprintf(buf, PAGE_SIZE,
4211 "adapter id: %d\nminor: %d\naen group: %d\n",
4212 adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4213}
4214
4215static struct device_attribute pmcraid_adapter_id_attr = {
4216 .attr = {
4217 .name = "adapter_id",
4218 .mode = S_IRUGO,
4219 },
4220 .show = pmcraid_show_adapter_id,
4221};
4222
4223static struct device_attribute *pmcraid_host_attrs[] = {
4224 &pmcraid_log_level_attr,
4225 &pmcraid_driver_version_attr,
4226 &pmcraid_adapter_id_attr,
4227 NULL,
4228};
4229
4230
4231/* host template structure for pmcraid driver */
4232static struct scsi_host_template pmcraid_host_template = {
4233 .module = THIS_MODULE,
4234 .name = PMCRAID_DRIVER_NAME,
4235 .queuecommand = pmcraid_queuecommand,
4236 .eh_abort_handler = pmcraid_eh_abort_handler,
4237 .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4238 .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4239 .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4240 .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4241
4242 .slave_alloc = pmcraid_slave_alloc,
4243 .slave_configure = pmcraid_slave_configure,
4244 .slave_destroy = pmcraid_slave_destroy,
4245 .change_queue_depth = pmcraid_change_queue_depth,
4246 .can_queue = PMCRAID_MAX_IO_CMD,
4247 .this_id = -1,
4248 .sg_tablesize = PMCRAID_MAX_IOADLS,
4249 .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4250 .no_write_same = 1,
4251 .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4252 .use_clustering = ENABLE_CLUSTERING,
4253 .shost_attrs = pmcraid_host_attrs,
4254 .proc_name = PMCRAID_DRIVER_NAME,
4255};
4256
4257/*
4258 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4259 * @irq: interrupt vector number
4260 * @dev_id: pointer hrrq_vector
4261 *
4262 * Return Value
4263 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4264 */
4265
4266static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4267{
4268 struct pmcraid_isr_param *hrrq_vector;
4269 struct pmcraid_instance *pinstance;
4270 unsigned long lock_flags;
4271 u32 intrs_val;
4272 int hrrq_id;
4273
4274 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4275 hrrq_id = hrrq_vector->hrrq_id;
4276 pinstance = hrrq_vector->drv_inst;
4277
4278 if (!hrrq_id) {
4279 /* Read the interrupt */
4280 intrs_val = pmcraid_read_interrupts(pinstance);
4281 if (intrs_val &&
4282 ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4283 & DOORBELL_INTR_MSIX_CLR) == 0)) {
4284 /* Any error interrupts including unit_check,
4285 * initiate IOA reset.In case of unit check indicate
4286 * to reset_sequence that IOA unit checked and prepare
4287 * for a dump during reset sequence
4288 */
4289 if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4290 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4291 pinstance->ioa_unit_check = 1;
4292
4293 pmcraid_err("ISR: error interrupts: %x \
4294 initiating reset\n", intrs_val);
4295 spin_lock_irqsave(pinstance->host->host_lock,
4296 lock_flags);
4297 pmcraid_initiate_reset(pinstance);
4298 spin_unlock_irqrestore(
4299 pinstance->host->host_lock,
4300 lock_flags);
4301 }
4302 /* If interrupt was as part of the ioa initialization,
4303 * clear it. Delete the timer and wakeup the
4304 * reset engine to proceed with reset sequence
4305 */
4306 if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4307 pmcraid_clr_trans_op(pinstance);
4308
4309 /* Clear the interrupt register by writing
4310 * to host to ioa doorbell. Once done
4311 * FW will clear the interrupt.
4312 */
4313 iowrite32(DOORBELL_INTR_MSIX_CLR,
4314 pinstance->int_regs.host_ioa_interrupt_reg);
4315 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4316
4317
4318 }
4319 }
4320
4321 tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4322
4323 return IRQ_HANDLED;
4324}
4325
4326/**
4327 * pmcraid_isr - implements legacy interrupt handling routine
4328 *
4329 * @irq: interrupt vector number
4330 * @dev_id: pointer hrrq_vector
4331 *
4332 * Return Value
4333 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4334 */
4335static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4336{
4337 struct pmcraid_isr_param *hrrq_vector;
4338 struct pmcraid_instance *pinstance;
4339 u32 intrs;
4340 unsigned long lock_flags;
4341 int hrrq_id = 0;
4342
4343 /* In case of legacy interrupt mode where interrupts are shared across
4344 * isrs, it may be possible that the current interrupt is not from IOA
4345 */
4346 if (!dev_id) {
4347 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4348 return IRQ_NONE;
4349 }
4350 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4351 pinstance = hrrq_vector->drv_inst;
4352
4353 intrs = pmcraid_read_interrupts(pinstance);
4354
4355 if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4356 return IRQ_NONE;
4357
4358 /* Any error interrupts including unit_check, initiate IOA reset.
4359 * In case of unit check indicate to reset_sequence that IOA unit
4360 * checked and prepare for a dump during reset sequence
4361 */
4362 if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4363
4364 if (intrs & INTRS_IOA_UNIT_CHECK)
4365 pinstance->ioa_unit_check = 1;
4366
4367 iowrite32(intrs,
4368 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4369 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4370 intrs);
4371 intrs = ioread32(
4372 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4373 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4374 pmcraid_initiate_reset(pinstance);
4375 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4376 } else {
4377 /* If interrupt was as part of the ioa initialization,
4378 * clear. Delete the timer and wakeup the
4379 * reset engine to proceed with reset sequence
4380 */
4381 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4382 pmcraid_clr_trans_op(pinstance);
4383 } else {
4384 iowrite32(intrs,
4385 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4386 ioread32(
4387 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4388
4389 tasklet_schedule(
4390 &(pinstance->isr_tasklet[hrrq_id]));
4391 }
4392 }
4393
4394 return IRQ_HANDLED;
4395}
4396
4397
4398/**
4399 * pmcraid_worker_function - worker thread function
4400 *
4401 * @workp: pointer to struct work queue
4402 *
4403 * Return Value
4404 * None
4405 */
4406
4407static void pmcraid_worker_function(struct work_struct *workp)
4408{
4409 struct pmcraid_instance *pinstance;
4410 struct pmcraid_resource_entry *res;
4411 struct pmcraid_resource_entry *temp;
4412 struct scsi_device *sdev;
4413 unsigned long lock_flags;
4414 unsigned long host_lock_flags;
4415 u16 fw_version;
4416 u8 bus, target, lun;
4417
4418 pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4419 /* add resources only after host is added into system */
4420 if (!atomic_read(&pinstance->expose_resources))
4421 return;
4422
4423 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4424
4425 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4426 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4427
4428 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4429 sdev = res->scsi_dev;
4430
4431 /* host_lock must be held before calling
4432 * scsi_device_get
4433 */
4434 spin_lock_irqsave(pinstance->host->host_lock,
4435 host_lock_flags);
4436 if (!scsi_device_get(sdev)) {
4437 spin_unlock_irqrestore(
4438 pinstance->host->host_lock,
4439 host_lock_flags);
4440 pmcraid_info("deleting %x from midlayer\n",
4441 res->cfg_entry.resource_address);
4442 list_move_tail(&res->queue,
4443 &pinstance->free_res_q);
4444 spin_unlock_irqrestore(
4445 &pinstance->resource_lock,
4446 lock_flags);
4447 scsi_remove_device(sdev);
4448 scsi_device_put(sdev);
4449 spin_lock_irqsave(&pinstance->resource_lock,
4450 lock_flags);
4451 res->change_detected = 0;
4452 } else {
4453 spin_unlock_irqrestore(
4454 pinstance->host->host_lock,
4455 host_lock_flags);
4456 }
4457 }
4458 }
4459
4460 list_for_each_entry(res, &pinstance->used_res_q, queue) {
4461
4462 if (res->change_detected == RES_CHANGE_ADD) {
4463
4464 if (!pmcraid_expose_resource(fw_version,
4465 &res->cfg_entry))
4466 continue;
4467
4468 if (RES_IS_VSET(res->cfg_entry)) {
4469 bus = PMCRAID_VSET_BUS_ID;
4470 if (fw_version <= PMCRAID_FW_VERSION_1)
4471 target = res->cfg_entry.unique_flags1;
4472 else
4473 target = res->cfg_entry.array_id & 0xFF;
4474 lun = PMCRAID_VSET_LUN_ID;
4475 } else {
4476 bus = PMCRAID_PHYS_BUS_ID;
4477 target =
4478 RES_TARGET(
4479 res->cfg_entry.resource_address);
4480 lun = RES_LUN(res->cfg_entry.resource_address);
4481 }
4482
4483 res->change_detected = 0;
4484 spin_unlock_irqrestore(&pinstance->resource_lock,
4485 lock_flags);
4486 scsi_add_device(pinstance->host, bus, target, lun);
4487 spin_lock_irqsave(&pinstance->resource_lock,
4488 lock_flags);
4489 }
4490 }
4491
4492 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4493}
4494
4495/**
4496 * pmcraid_tasklet_function - Tasklet function
4497 *
4498 * @instance: pointer to msix param structure
4499 *
4500 * Return Value
4501 * None
4502 */
4503static void pmcraid_tasklet_function(unsigned long instance)
4504{
4505 struct pmcraid_isr_param *hrrq_vector;
4506 struct pmcraid_instance *pinstance;
4507 unsigned long hrrq_lock_flags;
4508 unsigned long pending_lock_flags;
4509 unsigned long host_lock_flags;
4510 spinlock_t *lockp; /* hrrq buffer lock */
4511 int id;
4512 __le32 resp;
4513
4514 hrrq_vector = (struct pmcraid_isr_param *)instance;
4515 pinstance = hrrq_vector->drv_inst;
4516 id = hrrq_vector->hrrq_id;
4517 lockp = &(pinstance->hrrq_lock[id]);
4518
4519 /* loop through each of the commands responded by IOA. Each HRRQ buf is
4520 * protected by its own lock. Traversals must be done within this lock
4521 * as there may be multiple tasklets running on multiple CPUs. Note
4522 * that the lock is held just for picking up the response handle and
4523 * manipulating hrrq_curr/toggle_bit values.
4524 */
4525 spin_lock_irqsave(lockp, hrrq_lock_flags);
4526
4527 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4528
4529 while ((resp & HRRQ_TOGGLE_BIT) ==
4530 pinstance->host_toggle_bit[id]) {
4531
4532 int cmd_index = resp >> 2;
4533 struct pmcraid_cmd *cmd = NULL;
4534
4535 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4536 pinstance->hrrq_curr[id]++;
4537 } else {
4538 pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4539 pinstance->host_toggle_bit[id] ^= 1u;
4540 }
4541
4542 if (cmd_index >= PMCRAID_MAX_CMD) {
4543 /* In case of invalid response handle, log message */
4544 pmcraid_err("Invalid response handle %d\n", cmd_index);
4545 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4546 continue;
4547 }
4548
4549 cmd = pinstance->cmd_list[cmd_index];
4550 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4551
4552 spin_lock_irqsave(&pinstance->pending_pool_lock,
4553 pending_lock_flags);
4554 list_del(&cmd->free_list);
4555 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4556 pending_lock_flags);
4557 del_timer(&cmd->timer);
4558 atomic_dec(&pinstance->outstanding_cmds);
4559
4560 if (cmd->cmd_done == pmcraid_ioa_reset) {
4561 spin_lock_irqsave(pinstance->host->host_lock,
4562 host_lock_flags);
4563 cmd->cmd_done(cmd);
4564 spin_unlock_irqrestore(pinstance->host->host_lock,
4565 host_lock_flags);
4566 } else if (cmd->cmd_done != NULL) {
4567 cmd->cmd_done(cmd);
4568 }
4569 /* loop over until we are done with all responses */
4570 spin_lock_irqsave(lockp, hrrq_lock_flags);
4571 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4572 }
4573
4574 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4575}
4576
4577/**
4578 * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4579 * @pinstance: pointer to adapter instance structure
4580 *
4581 * This routine un-registers registered interrupt handler and
4582 * also frees irqs/vectors.
4583 *
4584 * Retun Value
4585 * None
4586 */
4587static
4588void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4589{
4590 int i;
4591
4592 for (i = 0; i < pinstance->num_hrrq; i++)
4593 free_irq(pinstance->hrrq_vector[i].vector,
4594 &(pinstance->hrrq_vector[i]));
4595
4596 if (pinstance->interrupt_mode) {
4597 pci_disable_msix(pinstance->pdev);
4598 pinstance->interrupt_mode = 0;
4599 }
4600}
4601
4602/**
4603 * pmcraid_register_interrupt_handler - registers interrupt handler
4604 * @pinstance: pointer to per-adapter instance structure
4605 *
4606 * Return Value
4607 * 0 on success, non-zero error code otherwise.
4608 */
4609static int
4610pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4611{
4612 int rc;
4613 struct pci_dev *pdev = pinstance->pdev;
4614
4615 if ((pmcraid_enable_msix) &&
4616 (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
4617 int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
4618 struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
4619 int i;
4620 for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
4621 entries[i].entry = i;
4622
4623 num_hrrq = pci_enable_msix_range(pdev, entries, 1, num_hrrq);
4624 if (num_hrrq < 0)
4625 goto pmcraid_isr_legacy;
4626
4627 for (i = 0; i < num_hrrq; i++) {
4628 pinstance->hrrq_vector[i].hrrq_id = i;
4629 pinstance->hrrq_vector[i].drv_inst = pinstance;
4630 pinstance->hrrq_vector[i].vector = entries[i].vector;
4631 rc = request_irq(pinstance->hrrq_vector[i].vector,
4632 pmcraid_isr_msix, 0,
4633 PMCRAID_DRIVER_NAME,
4634 &(pinstance->hrrq_vector[i]));
4635
4636 if (rc) {
4637 int j;
4638 for (j = 0; j < i; j++)
4639 free_irq(entries[j].vector,
4640 &(pinstance->hrrq_vector[j]));
4641 pci_disable_msix(pdev);
4642 goto pmcraid_isr_legacy;
4643 }
4644 }
4645
4646 pinstance->num_hrrq = num_hrrq;
4647 pinstance->interrupt_mode = 1;
4648 iowrite32(DOORBELL_INTR_MODE_MSIX,
4649 pinstance->int_regs.host_ioa_interrupt_reg);
4650 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4651 goto pmcraid_isr_out;
4652 }
4653
4654pmcraid_isr_legacy:
4655 /* If MSI-X registration failed fallback to legacy mode, where
4656 * only one hrrq entry will be used
4657 */
4658 pinstance->hrrq_vector[0].hrrq_id = 0;
4659 pinstance->hrrq_vector[0].drv_inst = pinstance;
4660 pinstance->hrrq_vector[0].vector = pdev->irq;
4661 pinstance->num_hrrq = 1;
4662
4663 rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
4664 PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
4665pmcraid_isr_out:
4666 return rc;
4667}
4668
4669/**
4670 * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4671 * @pinstance: per adapter instance structure pointer
4672 * @max_index: number of buffer blocks to release
4673 *
4674 * Return Value
4675 * None
4676 */
4677static void
4678pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4679{
4680 int i;
4681 for (i = 0; i < max_index; i++) {
4682 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4683 pinstance->cmd_list[i] = NULL;
4684 }
4685 kmem_cache_destroy(pinstance->cmd_cachep);
4686 pinstance->cmd_cachep = NULL;
4687}
4688
4689/**
4690 * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4691 * @pinstance: pointer to per adapter instance structure
4692 * @max_index: number of buffers (from 0 onwards) to release
4693 *
4694 * This function assumes that the command blocks for which control blocks are
4695 * linked are not released.
4696 *
4697 * Return Value
4698 * None
4699 */
4700static void
4701pmcraid_release_control_blocks(
4702 struct pmcraid_instance *pinstance,
4703 int max_index
4704)
4705{
4706 int i;
4707
4708 if (pinstance->control_pool == NULL)
4709 return;
4710
4711 for (i = 0; i < max_index; i++) {
4712 pci_pool_free(pinstance->control_pool,
4713 pinstance->cmd_list[i]->ioa_cb,
4714 pinstance->cmd_list[i]->ioa_cb_bus_addr);
4715 pinstance->cmd_list[i]->ioa_cb = NULL;
4716 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4717 }
4718 pci_pool_destroy(pinstance->control_pool);
4719 pinstance->control_pool = NULL;
4720}
4721
4722/**
4723 * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4724 * @pinstance - pointer to per adapter instance structure
4725 *
4726 * Allocates memory for command blocks using kernel slab allocator.
4727 *
4728 * Return Value
4729 * 0 in case of success; -ENOMEM in case of failure
4730 */
4731static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4732{
4733 int i;
4734
4735 sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4736 pinstance->host->unique_id);
4737
4738
4739 pinstance->cmd_cachep = kmem_cache_create(
4740 pinstance->cmd_pool_name,
4741 sizeof(struct pmcraid_cmd), 0,
4742 SLAB_HWCACHE_ALIGN, NULL);
4743 if (!pinstance->cmd_cachep)
4744 return -ENOMEM;
4745
4746 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4747 pinstance->cmd_list[i] =
4748 kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4749 if (!pinstance->cmd_list[i]) {
4750 pmcraid_release_cmd_blocks(pinstance, i);
4751 return -ENOMEM;
4752 }
4753 }
4754 return 0;
4755}
4756
4757/**
4758 * pmcraid_allocate_control_blocks - allocates memory control blocks
4759 * @pinstance : pointer to per adapter instance structure
4760 *
4761 * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4762 * and IOASAs. This is called after command blocks are already allocated.
4763 *
4764 * Return Value
4765 * 0 in case it can allocate all control blocks, otherwise -ENOMEM
4766 */
4767static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4768{
4769 int i;
4770
4771 sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4772 pinstance->host->unique_id);
4773
4774 pinstance->control_pool =
4775 pci_pool_create(pinstance->ctl_pool_name,
4776 pinstance->pdev,
4777 sizeof(struct pmcraid_control_block),
4778 PMCRAID_IOARCB_ALIGNMENT, 0);
4779
4780 if (!pinstance->control_pool)
4781 return -ENOMEM;
4782
4783 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4784 pinstance->cmd_list[i]->ioa_cb =
4785 pci_pool_alloc(
4786 pinstance->control_pool,
4787 GFP_KERNEL,
4788 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4789
4790 if (!pinstance->cmd_list[i]->ioa_cb) {
4791 pmcraid_release_control_blocks(pinstance, i);
4792 return -ENOMEM;
4793 }
4794 memset(pinstance->cmd_list[i]->ioa_cb, 0,
4795 sizeof(struct pmcraid_control_block));
4796 }
4797 return 0;
4798}
4799
4800/**
4801 * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4802 * @pinstance: pointer to per adapter instance structure
4803 * @maxindex: size of hrrq buffer pointer array
4804 *
4805 * Return Value
4806 * None
4807 */
4808static void
4809pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4810{
4811 int i;
4812 for (i = 0; i < maxindex; i++) {
4813
4814 pci_free_consistent(pinstance->pdev,
4815 HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4816 pinstance->hrrq_start[i],
4817 pinstance->hrrq_start_bus_addr[i]);
4818
4819 /* reset pointers and toggle bit to zeros */
4820 pinstance->hrrq_start[i] = NULL;
4821 pinstance->hrrq_start_bus_addr[i] = 0;
4822 pinstance->host_toggle_bit[i] = 0;
4823 }
4824}
4825
4826/**
4827 * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4828 * @pinstance: pointer to per adapter instance structure
4829 *
4830 * Return value
4831 * 0 hrrq buffers are allocated, -ENOMEM otherwise.
4832 */
4833static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4834{
4835 int i, buffer_size;
4836
4837 buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4838
4839 for (i = 0; i < pinstance->num_hrrq; i++) {
4840 pinstance->hrrq_start[i] =
4841 pci_alloc_consistent(
4842 pinstance->pdev,
4843 buffer_size,
4844 &(pinstance->hrrq_start_bus_addr[i]));
4845
4846 if (pinstance->hrrq_start[i] == 0) {
4847 pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4848 i);
4849 pmcraid_release_host_rrqs(pinstance, i);
4850 return -ENOMEM;
4851 }
4852
4853 memset(pinstance->hrrq_start[i], 0, buffer_size);
4854 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4855 pinstance->hrrq_end[i] =
4856 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4857 pinstance->host_toggle_bit[i] = 1;
4858 spin_lock_init(&pinstance->hrrq_lock[i]);
4859 }
4860 return 0;
4861}
4862
4863/**
4864 * pmcraid_release_hcams - release HCAM buffers
4865 *
4866 * @pinstance: pointer to per adapter instance structure
4867 *
4868 * Return value
4869 * none
4870 */
4871static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4872{
4873 if (pinstance->ccn.msg != NULL) {
4874 pci_free_consistent(pinstance->pdev,
4875 PMCRAID_AEN_HDR_SIZE +
4876 sizeof(struct pmcraid_hcam_ccn_ext),
4877 pinstance->ccn.msg,
4878 pinstance->ccn.baddr);
4879
4880 pinstance->ccn.msg = NULL;
4881 pinstance->ccn.hcam = NULL;
4882 pinstance->ccn.baddr = 0;
4883 }
4884
4885 if (pinstance->ldn.msg != NULL) {
4886 pci_free_consistent(pinstance->pdev,
4887 PMCRAID_AEN_HDR_SIZE +
4888 sizeof(struct pmcraid_hcam_ldn),
4889 pinstance->ldn.msg,
4890 pinstance->ldn.baddr);
4891
4892 pinstance->ldn.msg = NULL;
4893 pinstance->ldn.hcam = NULL;
4894 pinstance->ldn.baddr = 0;
4895 }
4896}
4897
4898/**
4899 * pmcraid_allocate_hcams - allocates HCAM buffers
4900 * @pinstance : pointer to per adapter instance structure
4901 *
4902 * Return Value:
4903 * 0 in case of successful allocation, non-zero otherwise
4904 */
4905static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4906{
4907 pinstance->ccn.msg = pci_alloc_consistent(
4908 pinstance->pdev,
4909 PMCRAID_AEN_HDR_SIZE +
4910 sizeof(struct pmcraid_hcam_ccn_ext),
4911 &(pinstance->ccn.baddr));
4912
4913 pinstance->ldn.msg = pci_alloc_consistent(
4914 pinstance->pdev,
4915 PMCRAID_AEN_HDR_SIZE +
4916 sizeof(struct pmcraid_hcam_ldn),
4917 &(pinstance->ldn.baddr));
4918
4919 if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
4920 pmcraid_release_hcams(pinstance);
4921 } else {
4922 pinstance->ccn.hcam =
4923 (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
4924 pinstance->ldn.hcam =
4925 (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
4926
4927 atomic_set(&pinstance->ccn.ignore, 0);
4928 atomic_set(&pinstance->ldn.ignore, 0);
4929 }
4930
4931 return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
4932}
4933
4934/**
4935 * pmcraid_release_config_buffers - release config.table buffers
4936 * @pinstance: pointer to per adapter instance structure
4937 *
4938 * Return Value
4939 * none
4940 */
4941static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
4942{
4943 if (pinstance->cfg_table != NULL &&
4944 pinstance->cfg_table_bus_addr != 0) {
4945 pci_free_consistent(pinstance->pdev,
4946 sizeof(struct pmcraid_config_table),
4947 pinstance->cfg_table,
4948 pinstance->cfg_table_bus_addr);
4949 pinstance->cfg_table = NULL;
4950 pinstance->cfg_table_bus_addr = 0;
4951 }
4952
4953 if (pinstance->res_entries != NULL) {
4954 int i;
4955
4956 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4957 list_del(&pinstance->res_entries[i].queue);
4958 kfree(pinstance->res_entries);
4959 pinstance->res_entries = NULL;
4960 }
4961
4962 pmcraid_release_hcams(pinstance);
4963}
4964
4965/**
4966 * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
4967 * @pinstance : pointer to per adapter instance structure
4968 *
4969 * Return Value
4970 * 0 for successful allocation, -ENOMEM for any failure
4971 */
4972static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
4973{
4974 int i;
4975
4976 pinstance->res_entries =
4977 kzalloc(sizeof(struct pmcraid_resource_entry) *
4978 PMCRAID_MAX_RESOURCES, GFP_KERNEL);
4979
4980 if (NULL == pinstance->res_entries) {
4981 pmcraid_err("failed to allocate memory for resource table\n");
4982 return -ENOMEM;
4983 }
4984
4985 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4986 list_add_tail(&pinstance->res_entries[i].queue,
4987 &pinstance->free_res_q);
4988
4989 pinstance->cfg_table =
4990 pci_alloc_consistent(pinstance->pdev,
4991 sizeof(struct pmcraid_config_table),
4992 &pinstance->cfg_table_bus_addr);
4993
4994 if (NULL == pinstance->cfg_table) {
4995 pmcraid_err("couldn't alloc DMA memory for config table\n");
4996 pmcraid_release_config_buffers(pinstance);
4997 return -ENOMEM;
4998 }
4999
5000 if (pmcraid_allocate_hcams(pinstance)) {
5001 pmcraid_err("could not alloc DMA memory for HCAMS\n");
5002 pmcraid_release_config_buffers(pinstance);
5003 return -ENOMEM;
5004 }
5005
5006 return 0;
5007}
5008
5009/**
5010 * pmcraid_init_tasklets - registers tasklets for response handling
5011 *
5012 * @pinstance: pointer adapter instance structure
5013 *
5014 * Return value
5015 * none
5016 */
5017static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
5018{
5019 int i;
5020 for (i = 0; i < pinstance->num_hrrq; i++)
5021 tasklet_init(&pinstance->isr_tasklet[i],
5022 pmcraid_tasklet_function,
5023 (unsigned long)&pinstance->hrrq_vector[i]);
5024}
5025
5026/**
5027 * pmcraid_kill_tasklets - destroys tasklets registered for response handling
5028 *
5029 * @pinstance: pointer to adapter instance structure
5030 *
5031 * Return value
5032 * none
5033 */
5034static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
5035{
5036 int i;
5037 for (i = 0; i < pinstance->num_hrrq; i++)
5038 tasklet_kill(&pinstance->isr_tasklet[i]);
5039}
5040
5041/**
5042 * pmcraid_release_buffers - release per-adapter buffers allocated
5043 *
5044 * @pinstance: pointer to adapter soft state
5045 *
5046 * Return Value
5047 * none
5048 */
5049static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
5050{
5051 pmcraid_release_config_buffers(pinstance);
5052 pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
5053 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5054 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5055
5056 if (pinstance->inq_data != NULL) {
5057 pci_free_consistent(pinstance->pdev,
5058 sizeof(struct pmcraid_inquiry_data),
5059 pinstance->inq_data,
5060 pinstance->inq_data_baddr);
5061
5062 pinstance->inq_data = NULL;
5063 pinstance->inq_data_baddr = 0;
5064 }
5065
5066 if (pinstance->timestamp_data != NULL) {
5067 pci_free_consistent(pinstance->pdev,
5068 sizeof(struct pmcraid_timestamp_data),
5069 pinstance->timestamp_data,
5070 pinstance->timestamp_data_baddr);
5071
5072 pinstance->timestamp_data = NULL;
5073 pinstance->timestamp_data_baddr = 0;
5074 }
5075}
5076
5077/**
5078 * pmcraid_init_buffers - allocates memory and initializes various structures
5079 * @pinstance: pointer to per adapter instance structure
5080 *
5081 * This routine pre-allocates memory based on the type of block as below:
5082 * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
5083 * IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator
5084 * config-table entries : DMAable memory using pci_alloc_consistent
5085 * HostRRQs : DMAable memory, using pci_alloc_consistent
5086 *
5087 * Return Value
5088 * 0 in case all of the blocks are allocated, -ENOMEM otherwise.
5089 */
5090static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
5091{
5092 int i;
5093
5094 if (pmcraid_allocate_host_rrqs(pinstance)) {
5095 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
5096 pinstance->num_hrrq);
5097 return -ENOMEM;
5098 }
5099
5100 if (pmcraid_allocate_config_buffers(pinstance)) {
5101 pmcraid_err("couldn't allocate memory for config buffers\n");
5102 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5103 return -ENOMEM;
5104 }
5105
5106 if (pmcraid_allocate_cmd_blocks(pinstance)) {
5107 pmcraid_err("couldn't allocate memory for cmd blocks\n");
5108 pmcraid_release_config_buffers(pinstance);
5109 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5110 return -ENOMEM;
5111 }
5112
5113 if (pmcraid_allocate_control_blocks(pinstance)) {
5114 pmcraid_err("couldn't allocate memory control blocks\n");
5115 pmcraid_release_config_buffers(pinstance);
5116 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5117 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5118 return -ENOMEM;
5119 }
5120
5121 /* allocate DMAable memory for page D0 INQUIRY buffer */
5122 pinstance->inq_data = pci_alloc_consistent(
5123 pinstance->pdev,
5124 sizeof(struct pmcraid_inquiry_data),
5125 &pinstance->inq_data_baddr);
5126
5127 if (pinstance->inq_data == NULL) {
5128 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
5129 pmcraid_release_buffers(pinstance);
5130 return -ENOMEM;
5131 }
5132
5133 /* allocate DMAable memory for set timestamp data buffer */
5134 pinstance->timestamp_data = pci_alloc_consistent(
5135 pinstance->pdev,
5136 sizeof(struct pmcraid_timestamp_data),
5137 &pinstance->timestamp_data_baddr);
5138
5139 if (pinstance->timestamp_data == NULL) {
5140 pmcraid_err("couldn't allocate DMA memory for \
5141 set time_stamp \n");
5142 pmcraid_release_buffers(pinstance);
5143 return -ENOMEM;
5144 }
5145
5146
5147 /* Initialize all the command blocks and add them to free pool. No
5148 * need to lock (free_pool_lock) as this is done in initialization
5149 * itself
5150 */
5151 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5152 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5153 pmcraid_init_cmdblk(cmdp, i);
5154 cmdp->drv_inst = pinstance;
5155 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5156 }
5157
5158 return 0;
5159}
5160
5161/**
5162 * pmcraid_reinit_buffers - resets various buffer pointers
5163 * @pinstance: pointer to adapter instance
5164 * Return value
5165 * none
5166 */
5167static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5168{
5169 int i;
5170 int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5171
5172 for (i = 0; i < pinstance->num_hrrq; i++) {
5173 memset(pinstance->hrrq_start[i], 0, buffer_size);
5174 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5175 pinstance->hrrq_end[i] =
5176 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5177 pinstance->host_toggle_bit[i] = 1;
5178 }
5179}
5180
5181/**
5182 * pmcraid_init_instance - initialize per instance data structure
5183 * @pdev: pointer to pci device structure
5184 * @host: pointer to Scsi_Host structure
5185 * @mapped_pci_addr: memory mapped IOA configuration registers
5186 *
5187 * Return Value
5188 * 0 on success, non-zero in case of any failure
5189 */
5190static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
5191 void __iomem *mapped_pci_addr)
5192{
5193 struct pmcraid_instance *pinstance =
5194 (struct pmcraid_instance *)host->hostdata;
5195
5196 pinstance->host = host;
5197 pinstance->pdev = pdev;
5198
5199 /* Initialize register addresses */
5200 pinstance->mapped_dma_addr = mapped_pci_addr;
5201
5202 /* Initialize chip-specific details */
5203 {
5204 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5205 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5206
5207 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5208
5209 pint_regs->ioa_host_interrupt_reg =
5210 mapped_pci_addr + chip_cfg->ioa_host_intr;
5211 pint_regs->ioa_host_interrupt_clr_reg =
5212 mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5213 pint_regs->ioa_host_msix_interrupt_reg =
5214 mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5215 pint_regs->host_ioa_interrupt_reg =
5216 mapped_pci_addr + chip_cfg->host_ioa_intr;
5217 pint_regs->host_ioa_interrupt_clr_reg =
5218 mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5219
5220 /* Current version of firmware exposes interrupt mask set
5221 * and mask clr registers through memory mapped bar0.
5222 */
5223 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5224 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5225 pint_regs->ioa_host_interrupt_mask_reg =
5226 mapped_pci_addr + chip_cfg->ioa_host_mask;
5227 pint_regs->ioa_host_interrupt_mask_clr_reg =
5228 mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5229 pint_regs->global_interrupt_mask_reg =
5230 mapped_pci_addr + chip_cfg->global_intr_mask;
5231 };
5232
5233 pinstance->ioa_reset_attempts = 0;
5234 init_waitqueue_head(&pinstance->reset_wait_q);
5235
5236 atomic_set(&pinstance->outstanding_cmds, 0);
5237 atomic_set(&pinstance->last_message_id, 0);
5238 atomic_set(&pinstance->expose_resources, 0);
5239
5240 INIT_LIST_HEAD(&pinstance->free_res_q);
5241 INIT_LIST_HEAD(&pinstance->used_res_q);
5242 INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5243 INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5244
5245 spin_lock_init(&pinstance->free_pool_lock);
5246 spin_lock_init(&pinstance->pending_pool_lock);
5247 spin_lock_init(&pinstance->resource_lock);
5248 mutex_init(&pinstance->aen_queue_lock);
5249
5250 /* Work-queue (Shared) for deferred processing error handling */
5251 INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5252
5253 /* Initialize the default log_level */
5254 pinstance->current_log_level = pmcraid_log_level;
5255
5256 /* Setup variables required for reset engine */
5257 pinstance->ioa_state = IOA_STATE_UNKNOWN;
5258 pinstance->reset_cmd = NULL;
5259 return 0;
5260}
5261
5262/**
5263 * pmcraid_shutdown - shutdown adapter controller.
5264 * @pdev: pci device struct
5265 *
5266 * Issues an adapter shutdown to the card waits for its completion
5267 *
5268 * Return value
5269 * none
5270 */
5271static void pmcraid_shutdown(struct pci_dev *pdev)
5272{
5273 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5274 pmcraid_reset_bringdown(pinstance);
5275}
5276
5277
5278/**
5279 * pmcraid_get_minor - returns unused minor number from minor number bitmap
5280 */
5281static unsigned short pmcraid_get_minor(void)
5282{
5283 int minor;
5284
5285 minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
5286 __set_bit(minor, pmcraid_minor);
5287 return minor;
5288}
5289
5290/**
5291 * pmcraid_release_minor - releases given minor back to minor number bitmap
5292 */
5293static void pmcraid_release_minor(unsigned short minor)
5294{
5295 __clear_bit(minor, pmcraid_minor);
5296}
5297
5298/**
5299 * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5300 *
5301 * @pinstance: pointer to adapter instance for which to register device
5302 *
5303 * Return value
5304 * 0 in case of success, otherwise non-zero
5305 */
5306static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5307{
5308 int minor;
5309 int error;
5310
5311 minor = pmcraid_get_minor();
5312 cdev_init(&pinstance->cdev, &pmcraid_fops);
5313 pinstance->cdev.owner = THIS_MODULE;
5314
5315 error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5316
5317 if (error)
5318 pmcraid_release_minor(minor);
5319 else
5320 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5321 NULL, "%s%u", PMCRAID_DEVFILE, minor);
5322 return error;
5323}
5324
5325/**
5326 * pmcraid_release_chrdev - unregisters per-adapter management interface
5327 *
5328 * @pinstance: pointer to adapter instance structure
5329 *
5330 * Return value
5331 * none
5332 */
5333static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5334{
5335 pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5336 device_destroy(pmcraid_class,
5337 MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5338 cdev_del(&pinstance->cdev);
5339}
5340
5341/**
5342 * pmcraid_remove - IOA hot plug remove entry point
5343 * @pdev: pci device struct
5344 *
5345 * Return value
5346 * none
5347 */
5348static void pmcraid_remove(struct pci_dev *pdev)
5349{
5350 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5351
5352 /* remove the management interface (/dev file) for this device */
5353 pmcraid_release_chrdev(pinstance);
5354
5355 /* remove host template from scsi midlayer */
5356 scsi_remove_host(pinstance->host);
5357
5358 /* block requests from mid-layer */
5359 scsi_block_requests(pinstance->host);
5360
5361 /* initiate shutdown adapter */
5362 pmcraid_shutdown(pdev);
5363
5364 pmcraid_disable_interrupts(pinstance, ~0);
5365 flush_work(&pinstance->worker_q);
5366
5367 pmcraid_kill_tasklets(pinstance);
5368 pmcraid_unregister_interrupt_handler(pinstance);
5369 pmcraid_release_buffers(pinstance);
5370 iounmap(pinstance->mapped_dma_addr);
5371 pci_release_regions(pdev);
5372 scsi_host_put(pinstance->host);
5373 pci_disable_device(pdev);
5374
5375 return;
5376}
5377
5378#ifdef CONFIG_PM
5379/**
5380 * pmcraid_suspend - driver suspend entry point for power management
5381 * @pdev: PCI device structure
5382 * @state: PCI power state to suspend routine
5383 *
5384 * Return Value - 0 always
5385 */
5386static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
5387{
5388 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5389
5390 pmcraid_shutdown(pdev);
5391 pmcraid_disable_interrupts(pinstance, ~0);
5392 pmcraid_kill_tasklets(pinstance);
5393 pci_set_drvdata(pinstance->pdev, pinstance);
5394 pmcraid_unregister_interrupt_handler(pinstance);
5395 pci_save_state(pdev);
5396 pci_disable_device(pdev);
5397 pci_set_power_state(pdev, pci_choose_state(pdev, state));
5398
5399 return 0;
5400}
5401
5402/**
5403 * pmcraid_resume - driver resume entry point PCI power management
5404 * @pdev: PCI device structure
5405 *
5406 * Return Value - 0 in case of success. Error code in case of any failure
5407 */
5408static int pmcraid_resume(struct pci_dev *pdev)
5409{
5410 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5411 struct Scsi_Host *host = pinstance->host;
5412 int rc;
5413
5414 pci_set_power_state(pdev, PCI_D0);
5415 pci_enable_wake(pdev, PCI_D0, 0);
5416 pci_restore_state(pdev);
5417
5418 rc = pci_enable_device(pdev);
5419
5420 if (rc) {
5421 dev_err(&pdev->dev, "resume: Enable device failed\n");
5422 return rc;
5423 }
5424
5425 pci_set_master(pdev);
5426
5427 if ((sizeof(dma_addr_t) == 4) ||
5428 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5429 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5430
5431 if (rc == 0)
5432 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5433
5434 if (rc != 0) {
5435 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5436 goto disable_device;
5437 }
5438
5439 pmcraid_disable_interrupts(pinstance, ~0);
5440 atomic_set(&pinstance->outstanding_cmds, 0);
5441 rc = pmcraid_register_interrupt_handler(pinstance);
5442
5443 if (rc) {
5444 dev_err(&pdev->dev,
5445 "resume: couldn't register interrupt handlers\n");
5446 rc = -ENODEV;
5447 goto release_host;
5448 }
5449
5450 pmcraid_init_tasklets(pinstance);
5451 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5452
5453 /* Start with hard reset sequence which brings up IOA to operational
5454 * state as well as completes the reset sequence.
5455 */
5456 pinstance->ioa_hard_reset = 1;
5457
5458 /* Start IOA firmware initialization and bring card to Operational
5459 * state.
5460 */
5461 if (pmcraid_reset_bringup(pinstance)) {
5462 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5463 rc = -ENODEV;
5464 goto release_tasklets;
5465 }
5466
5467 return 0;
5468
5469release_tasklets:
5470 pmcraid_disable_interrupts(pinstance, ~0);
5471 pmcraid_kill_tasklets(pinstance);
5472 pmcraid_unregister_interrupt_handler(pinstance);
5473
5474release_host:
5475 scsi_host_put(host);
5476
5477disable_device:
5478 pci_disable_device(pdev);
5479
5480 return rc;
5481}
5482
5483#else
5484
5485#define pmcraid_suspend NULL
5486#define pmcraid_resume NULL
5487
5488#endif /* CONFIG_PM */
5489
5490/**
5491 * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5492 * completion of the ioa reset
5493 * @cmd: pointer to reset command block
5494 */
5495static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5496{
5497 struct pmcraid_instance *pinstance = cmd->drv_inst;
5498 unsigned long flags;
5499
5500 spin_lock_irqsave(pinstance->host->host_lock, flags);
5501 pmcraid_ioa_reset(cmd);
5502 spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5503 scsi_unblock_requests(pinstance->host);
5504 schedule_work(&pinstance->worker_q);
5505}
5506
5507/**
5508 * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5509 *
5510 * @cmd: pointer to pmcraid_cmd structure
5511 *
5512 * Return Value
5513 * 0 for success or non-zero for failure cases
5514 */
5515static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5516{
5517 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5518 void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5519
5520 pmcraid_reinit_cmdblk(cmd);
5521
5522 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5523 ioarcb->request_type = REQ_TYPE_IOACMD;
5524 ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5525 ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5526
5527 /* If this was called as part of resource table reinitialization due to
5528 * lost CCN, it is enough to return the command block back to free pool
5529 * as part of set_supported_devs completion function.
5530 */
5531 if (cmd->drv_inst->reinit_cfg_table) {
5532 cmd->drv_inst->reinit_cfg_table = 0;
5533 cmd->release = 1;
5534 cmd_done = pmcraid_reinit_cfgtable_done;
5535 }
5536
5537 /* we will be done with the reset sequence after set supported devices,
5538 * setup the done function to return the command block back to free
5539 * pool
5540 */
5541 pmcraid_send_cmd(cmd,
5542 cmd_done,
5543 PMCRAID_SET_SUP_DEV_TIMEOUT,
5544 pmcraid_timeout_handler);
5545 return;
5546}
5547
5548/**
5549 * pmcraid_set_timestamp - set the timestamp to IOAFP
5550 *
5551 * @cmd: pointer to pmcraid_cmd structure
5552 *
5553 * Return Value
5554 * 0 for success or non-zero for failure cases
5555 */
5556static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5557{
5558 struct pmcraid_instance *pinstance = cmd->drv_inst;
5559 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5560 __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5561 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5562
5563 __le64 timestamp;
5564
5565 timestamp = ktime_get_real_seconds() * 1000;
5566
5567 pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5568 pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5569 pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5570 pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5571 pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5572 pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp) >> 40);
5573
5574 pmcraid_reinit_cmdblk(cmd);
5575 ioarcb->request_type = REQ_TYPE_SCSI;
5576 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5577 ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5578 ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5579 memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5580
5581 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5582 offsetof(struct pmcraid_ioarcb,
5583 add_data.u.ioadl[0]));
5584 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5585 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5586
5587 ioarcb->request_flags0 |= NO_LINK_DESCS;
5588 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5589 ioarcb->data_transfer_length =
5590 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5591 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5592 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5593 ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5594 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5595
5596 if (!pinstance->timestamp_error) {
5597 pinstance->timestamp_error = 0;
5598 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5599 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5600 } else {
5601 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5602 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5603 return;
5604 }
5605}
5606
5607
5608/**
5609 * pmcraid_init_res_table - Initialize the resource table
5610 * @cmd: pointer to pmcraid command struct
5611 *
5612 * This function looks through the existing resource table, comparing
5613 * it with the config table. This function will take care of old/new
5614 * devices and schedule adding/removing them from the mid-layer
5615 * as appropriate.
5616 *
5617 * Return value
5618 * None
5619 */
5620static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5621{
5622 struct pmcraid_instance *pinstance = cmd->drv_inst;
5623 struct pmcraid_resource_entry *res, *temp;
5624 struct pmcraid_config_table_entry *cfgte;
5625 unsigned long lock_flags;
5626 int found, rc, i;
5627 u16 fw_version;
5628 LIST_HEAD(old_res);
5629
5630 if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5631 pmcraid_err("IOA requires microcode download\n");
5632
5633 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5634
5635 /* resource list is protected by pinstance->resource_lock.
5636 * init_res_table can be called from probe (user-thread) or runtime
5637 * reset (timer/tasklet)
5638 */
5639 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5640
5641 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5642 list_move_tail(&res->queue, &old_res);
5643
5644 for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
5645 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5646 PMCRAID_FW_VERSION_1)
5647 cfgte = &pinstance->cfg_table->entries[i];
5648 else
5649 cfgte = (struct pmcraid_config_table_entry *)
5650 &pinstance->cfg_table->entries_ext[i];
5651
5652 if (!pmcraid_expose_resource(fw_version, cfgte))
5653 continue;
5654
5655 found = 0;
5656
5657 /* If this entry was already detected and initialized */
5658 list_for_each_entry_safe(res, temp, &old_res, queue) {
5659
5660 rc = memcmp(&res->cfg_entry.resource_address,
5661 &cfgte->resource_address,
5662 sizeof(cfgte->resource_address));
5663 if (!rc) {
5664 list_move_tail(&res->queue,
5665 &pinstance->used_res_q);
5666 found = 1;
5667 break;
5668 }
5669 }
5670
5671 /* If this is new entry, initialize it and add it the queue */
5672 if (!found) {
5673
5674 if (list_empty(&pinstance->free_res_q)) {
5675 pmcraid_err("Too many devices attached\n");
5676 break;
5677 }
5678
5679 found = 1;
5680 res = list_entry(pinstance->free_res_q.next,
5681 struct pmcraid_resource_entry, queue);
5682
5683 res->scsi_dev = NULL;
5684 res->change_detected = RES_CHANGE_ADD;
5685 res->reset_progress = 0;
5686 list_move_tail(&res->queue, &pinstance->used_res_q);
5687 }
5688
5689 /* copy new configuration table entry details into driver
5690 * maintained resource entry
5691 */
5692 if (found) {
5693 memcpy(&res->cfg_entry, cfgte,
5694 pinstance->config_table_entry_size);
5695 pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5696 res->cfg_entry.resource_type,
5697 (fw_version <= PMCRAID_FW_VERSION_1 ?
5698 res->cfg_entry.unique_flags1 :
5699 res->cfg_entry.array_id & 0xFF),
5700 le32_to_cpu(res->cfg_entry.resource_address));
5701 }
5702 }
5703
5704 /* Detect any deleted entries, mark them for deletion from mid-layer */
5705 list_for_each_entry_safe(res, temp, &old_res, queue) {
5706
5707 if (res->scsi_dev) {
5708 res->change_detected = RES_CHANGE_DEL;
5709 res->cfg_entry.resource_handle =
5710 PMCRAID_INVALID_RES_HANDLE;
5711 list_move_tail(&res->queue, &pinstance->used_res_q);
5712 } else {
5713 list_move_tail(&res->queue, &pinstance->free_res_q);
5714 }
5715 }
5716
5717 /* release the resource list lock */
5718 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5719 pmcraid_set_timestamp(cmd);
5720}
5721
5722/**
5723 * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5724 * @cmd: pointer pmcraid_cmd struct
5725 *
5726 * This function sends a Query IOA Configuration command to the adapter to
5727 * retrieve the IOA configuration table.
5728 *
5729 * Return value:
5730 * none
5731 */
5732static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5733{
5734 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5735 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5736 struct pmcraid_instance *pinstance = cmd->drv_inst;
5737 int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5738
5739 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5740 PMCRAID_FW_VERSION_1)
5741 pinstance->config_table_entry_size =
5742 sizeof(struct pmcraid_config_table_entry);
5743 else
5744 pinstance->config_table_entry_size =
5745 sizeof(struct pmcraid_config_table_entry_ext);
5746
5747 ioarcb->request_type = REQ_TYPE_IOACMD;
5748 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5749
5750 ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5751
5752 /* firmware requires 4-byte length field, specified in B.E format */
5753 memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5754
5755 /* Since entire config table can be described by single IOADL, it can
5756 * be part of IOARCB itself
5757 */
5758 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5759 offsetof(struct pmcraid_ioarcb,
5760 add_data.u.ioadl[0]));
5761 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5762 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5763
5764 ioarcb->request_flags0 |= NO_LINK_DESCS;
5765 ioarcb->data_transfer_length =
5766 cpu_to_le32(sizeof(struct pmcraid_config_table));
5767
5768 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5769 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5770 ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5771 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5772
5773 pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5774 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5775}
5776
5777
5778/**
5779 * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5780 * @pdev: pointer to pci device structure
5781 * @dev_id: pointer to device ids structure
5782 *
5783 * Return Value
5784 * returns 0 if the device is claimed and successfully configured.
5785 * returns non-zero error code in case of any failure
5786 */
5787static int pmcraid_probe(struct pci_dev *pdev,
5788 const struct pci_device_id *dev_id)
5789{
5790 struct pmcraid_instance *pinstance;
5791 struct Scsi_Host *host;
5792 void __iomem *mapped_pci_addr;
5793 int rc = PCIBIOS_SUCCESSFUL;
5794
5795 if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5796 pmcraid_err
5797 ("maximum number(%d) of supported adapters reached\n",
5798 atomic_read(&pmcraid_adapter_count));
5799 return -ENOMEM;
5800 }
5801
5802 atomic_inc(&pmcraid_adapter_count);
5803 rc = pci_enable_device(pdev);
5804
5805 if (rc) {
5806 dev_err(&pdev->dev, "Cannot enable adapter\n");
5807 atomic_dec(&pmcraid_adapter_count);
5808 return rc;
5809 }
5810
5811 dev_info(&pdev->dev,
5812 "Found new IOA(%x:%x), Total IOA count: %d\n",
5813 pdev->vendor, pdev->device,
5814 atomic_read(&pmcraid_adapter_count));
5815
5816 rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5817
5818 if (rc < 0) {
5819 dev_err(&pdev->dev,
5820 "Couldn't register memory range of registers\n");
5821 goto out_disable_device;
5822 }
5823
5824 mapped_pci_addr = pci_iomap(pdev, 0, 0);
5825
5826 if (!mapped_pci_addr) {
5827 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5828 rc = -ENOMEM;
5829 goto out_release_regions;
5830 }
5831
5832 pci_set_master(pdev);
5833
5834 /* Firmware requires the system bus address of IOARCB to be within
5835 * 32-bit addressable range though it has 64-bit IOARRIN register.
5836 * However, firmware supports 64-bit streaming DMA buffers, whereas
5837 * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
5838 * returns memory within 4GB (if not, change this logic), coherent
5839 * buffers are within firmware acceptable address ranges.
5840 */
5841 if ((sizeof(dma_addr_t) == 4) ||
5842 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5843 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5844
5845 /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5846 * bit mask for pci_alloc_consistent to return addresses within 4GB
5847 */
5848 if (rc == 0)
5849 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5850
5851 if (rc != 0) {
5852 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5853 goto cleanup_nomem;
5854 }
5855
5856 host = scsi_host_alloc(&pmcraid_host_template,
5857 sizeof(struct pmcraid_instance));
5858
5859 if (!host) {
5860 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5861 rc = -ENOMEM;
5862 goto cleanup_nomem;
5863 }
5864
5865 host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5866 host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5867 host->unique_id = host->host_no;
5868 host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5869 host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5870
5871 /* zero out entire instance structure */
5872 pinstance = (struct pmcraid_instance *)host->hostdata;
5873 memset(pinstance, 0, sizeof(*pinstance));
5874
5875 pinstance->chip_cfg =
5876 (struct pmcraid_chip_details *)(dev_id->driver_data);
5877
5878 rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5879
5880 if (rc < 0) {
5881 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5882 goto out_scsi_host_put;
5883 }
5884
5885 pci_set_drvdata(pdev, pinstance);
5886
5887 /* Save PCI config-space for use following the reset */
5888 rc = pci_save_state(pinstance->pdev);
5889
5890 if (rc != 0) {
5891 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5892 goto out_scsi_host_put;
5893 }
5894
5895 pmcraid_disable_interrupts(pinstance, ~0);
5896
5897 rc = pmcraid_register_interrupt_handler(pinstance);
5898
5899 if (rc) {
5900 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5901 goto out_scsi_host_put;
5902 }
5903
5904 pmcraid_init_tasklets(pinstance);
5905
5906 /* allocate verious buffers used by LLD.*/
5907 rc = pmcraid_init_buffers(pinstance);
5908
5909 if (rc) {
5910 pmcraid_err("couldn't allocate memory blocks\n");
5911 goto out_unregister_isr;
5912 }
5913
5914 /* check the reset type required */
5915 pmcraid_reset_type(pinstance);
5916
5917 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5918
5919 /* Start IOA firmware initialization and bring card to Operational
5920 * state.
5921 */
5922 pmcraid_info("starting IOA initialization sequence\n");
5923 if (pmcraid_reset_bringup(pinstance)) {
5924 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5925 rc = 1;
5926 goto out_release_bufs;
5927 }
5928
5929 /* Add adapter instance into mid-layer list */
5930 rc = scsi_add_host(pinstance->host, &pdev->dev);
5931 if (rc != 0) {
5932 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
5933 goto out_release_bufs;
5934 }
5935
5936 scsi_scan_host(pinstance->host);
5937
5938 rc = pmcraid_setup_chrdev(pinstance);
5939
5940 if (rc != 0) {
5941 pmcraid_err("couldn't create mgmt interface, error: %x\n",
5942 rc);
5943 goto out_remove_host;
5944 }
5945
5946 /* Schedule worker thread to handle CCN and take care of adding and
5947 * removing devices to OS
5948 */
5949 atomic_set(&pinstance->expose_resources, 1);
5950 schedule_work(&pinstance->worker_q);
5951 return rc;
5952
5953out_remove_host:
5954 scsi_remove_host(host);
5955
5956out_release_bufs:
5957 pmcraid_release_buffers(pinstance);
5958
5959out_unregister_isr:
5960 pmcraid_kill_tasklets(pinstance);
5961 pmcraid_unregister_interrupt_handler(pinstance);
5962
5963out_scsi_host_put:
5964 scsi_host_put(host);
5965
5966cleanup_nomem:
5967 iounmap(mapped_pci_addr);
5968
5969out_release_regions:
5970 pci_release_regions(pdev);
5971
5972out_disable_device:
5973 atomic_dec(&pmcraid_adapter_count);
5974 pci_disable_device(pdev);
5975 return -ENODEV;
5976}
5977
5978/*
5979 * PCI driver structure of pcmraid driver
5980 */
5981static struct pci_driver pmcraid_driver = {
5982 .name = PMCRAID_DRIVER_NAME,
5983 .id_table = pmcraid_pci_table,
5984 .probe = pmcraid_probe,
5985 .remove = pmcraid_remove,
5986 .suspend = pmcraid_suspend,
5987 .resume = pmcraid_resume,
5988 .shutdown = pmcraid_shutdown
5989};
5990
5991/**
5992 * pmcraid_init - module load entry point
5993 */
5994static int __init pmcraid_init(void)
5995{
5996 dev_t dev;
5997 int error;
5998
5999 pmcraid_info("%s Device Driver version: %s\n",
6000 PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
6001
6002 error = alloc_chrdev_region(&dev, 0,
6003 PMCRAID_MAX_ADAPTERS,
6004 PMCRAID_DEVFILE);
6005
6006 if (error) {
6007 pmcraid_err("failed to get a major number for adapters\n");
6008 goto out_init;
6009 }
6010
6011 pmcraid_major = MAJOR(dev);
6012 pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
6013
6014 if (IS_ERR(pmcraid_class)) {
6015 error = PTR_ERR(pmcraid_class);
6016 pmcraid_err("failed to register with sysfs, error = %x\n",
6017 error);
6018 goto out_unreg_chrdev;
6019 }
6020
6021 error = pmcraid_netlink_init();
6022
6023 if (error) {
6024 class_destroy(pmcraid_class);
6025 goto out_unreg_chrdev;
6026 }
6027
6028 error = pci_register_driver(&pmcraid_driver);
6029
6030 if (error == 0)
6031 goto out_init;
6032
6033 pmcraid_err("failed to register pmcraid driver, error = %x\n",
6034 error);
6035 class_destroy(pmcraid_class);
6036 pmcraid_netlink_release();
6037
6038out_unreg_chrdev:
6039 unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
6040
6041out_init:
6042 return error;
6043}
6044
6045/**
6046 * pmcraid_exit - module unload entry point
6047 */
6048static void __exit pmcraid_exit(void)
6049{
6050 pmcraid_netlink_release();
6051 unregister_chrdev_region(MKDEV(pmcraid_major, 0),
6052 PMCRAID_MAX_ADAPTERS);
6053 pci_unregister_driver(&pmcraid_driver);
6054 class_destroy(pmcraid_class);
6055}
6056
6057module_init(pmcraid_init);
6058module_exit(pmcraid_exit);