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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/version.h>
43#include <linux/io.h>
44#include <linux/slab.h>
45#include <asm/irq.h>
46#include <asm/processor.h>
47#include <linux/libata.h>
48#include <linux/mutex.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[] __devinitdata = {
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 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 if (scsi_dev->tagged_supported &&
254 (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
255 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
256 scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
257 scsi_dev->host->cmd_per_lun);
258 } else {
259 scsi_adjust_queue_depth(scsi_dev, 0,
260 scsi_dev->host->cmd_per_lun);
261 }
262
263 return 0;
264}
265
266/**
267 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
268 *
269 * @scsi_dev: scsi device struct
270 *
271 * This is called by mid-layer before removing a device. Pointer assignments
272 * done in pmcraid_slave_alloc will be reset to NULL here.
273 *
274 * Return value
275 * none
276 */
277static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
278{
279 struct pmcraid_resource_entry *res;
280
281 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
282
283 if (res)
284 res->scsi_dev = NULL;
285
286 scsi_dev->hostdata = NULL;
287}
288
289/**
290 * pmcraid_change_queue_depth - Change the device's queue depth
291 * @scsi_dev: scsi device struct
292 * @depth: depth to set
293 * @reason: calling context
294 *
295 * Return value
296 * actual depth set
297 */
298static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
299 int reason)
300{
301 if (reason != SCSI_QDEPTH_DEFAULT)
302 return -EOPNOTSUPP;
303
304 if (depth > PMCRAID_MAX_CMD_PER_LUN)
305 depth = PMCRAID_MAX_CMD_PER_LUN;
306
307 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
308
309 return scsi_dev->queue_depth;
310}
311
312/**
313 * pmcraid_change_queue_type - Change the device's queue type
314 * @scsi_dev: scsi device struct
315 * @tag: type of tags to use
316 *
317 * Return value:
318 * actual queue type set
319 */
320static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
321{
322 struct pmcraid_resource_entry *res;
323
324 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
325
326 if ((res) && scsi_dev->tagged_supported &&
327 (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
328 scsi_set_tag_type(scsi_dev, tag);
329
330 if (tag)
331 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
332 else
333 scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
334 } else
335 tag = 0;
336
337 return tag;
338}
339
340
341/**
342 * pmcraid_init_cmdblk - initializes a command block
343 *
344 * @cmd: pointer to struct pmcraid_cmd to be initialized
345 * @index: if >=0 first time initialization; otherwise reinitialization
346 *
347 * Return Value
348 * None
349 */
350void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
351{
352 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
353 dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
354
355 if (index >= 0) {
356 /* first time initialization (called from probe) */
357 u32 ioasa_offset =
358 offsetof(struct pmcraid_control_block, ioasa);
359
360 cmd->index = index;
361 ioarcb->response_handle = cpu_to_le32(index << 2);
362 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
363 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
364 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
365 } else {
366 /* re-initialization of various lengths, called once command is
367 * processed by IOA
368 */
369 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
370 ioarcb->hrrq_id = 0;
371 ioarcb->request_flags0 = 0;
372 ioarcb->request_flags1 = 0;
373 ioarcb->cmd_timeout = 0;
374 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
375 ioarcb->ioadl_bus_addr = 0;
376 ioarcb->ioadl_length = 0;
377 ioarcb->data_transfer_length = 0;
378 ioarcb->add_cmd_param_length = 0;
379 ioarcb->add_cmd_param_offset = 0;
380 cmd->ioa_cb->ioasa.ioasc = 0;
381 cmd->ioa_cb->ioasa.residual_data_length = 0;
382 cmd->time_left = 0;
383 }
384
385 cmd->cmd_done = NULL;
386 cmd->scsi_cmd = NULL;
387 cmd->release = 0;
388 cmd->completion_req = 0;
389 cmd->sense_buffer = 0;
390 cmd->sense_buffer_dma = 0;
391 cmd->dma_handle = 0;
392 init_timer(&cmd->timer);
393}
394
395/**
396 * pmcraid_reinit_cmdblk - reinitialize a command block
397 *
398 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
399 *
400 * Return Value
401 * None
402 */
403static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
404{
405 pmcraid_init_cmdblk(cmd, -1);
406}
407
408/**
409 * pmcraid_get_free_cmd - get a free cmd block from command block pool
410 * @pinstance: adapter instance structure
411 *
412 * Return Value:
413 * returns pointer to cmd block or NULL if no blocks are available
414 */
415static struct pmcraid_cmd *pmcraid_get_free_cmd(
416 struct pmcraid_instance *pinstance
417)
418{
419 struct pmcraid_cmd *cmd = NULL;
420 unsigned long lock_flags;
421
422 /* free cmd block list is protected by free_pool_lock */
423 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
424
425 if (!list_empty(&pinstance->free_cmd_pool)) {
426 cmd = list_entry(pinstance->free_cmd_pool.next,
427 struct pmcraid_cmd, free_list);
428 list_del(&cmd->free_list);
429 }
430 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
431
432 /* Initialize the command block before giving it the caller */
433 if (cmd != NULL)
434 pmcraid_reinit_cmdblk(cmd);
435 return cmd;
436}
437
438/**
439 * pmcraid_return_cmd - return a completed command block back into free pool
440 * @cmd: pointer to the command block
441 *
442 * Return Value:
443 * nothing
444 */
445void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
446{
447 struct pmcraid_instance *pinstance = cmd->drv_inst;
448 unsigned long lock_flags;
449
450 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
451 list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
452 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
453}
454
455/**
456 * pmcraid_read_interrupts - reads IOA interrupts
457 *
458 * @pinstance: pointer to adapter instance structure
459 *
460 * Return value
461 * interrupts read from IOA
462 */
463static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
464{
465 return (pinstance->interrupt_mode) ?
466 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
467 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
468}
469
470/**
471 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
472 *
473 * @pinstance: pointer to per adapter instance structure
474 * @intrs: interrupts to disable
475 *
476 * Return Value
477 * None
478 */
479static void pmcraid_disable_interrupts(
480 struct pmcraid_instance *pinstance,
481 u32 intrs
482)
483{
484 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
485 u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
486
487 iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
488 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
489 ioread32(pinstance->int_regs.global_interrupt_mask_reg);
490
491 if (!pinstance->interrupt_mode) {
492 iowrite32(intrs,
493 pinstance->int_regs.ioa_host_interrupt_mask_reg);
494 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
495 }
496}
497
498/**
499 * pmcraid_enable_interrupts - Enables specified interrupts
500 *
501 * @pinstance: pointer to per adapter instance structure
502 * @intr: interrupts to enable
503 *
504 * Return Value
505 * None
506 */
507static void pmcraid_enable_interrupts(
508 struct pmcraid_instance *pinstance,
509 u32 intrs
510)
511{
512 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
513 u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
514
515 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
516
517 if (!pinstance->interrupt_mode) {
518 iowrite32(~intrs,
519 pinstance->int_regs.ioa_host_interrupt_mask_reg);
520 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
521 }
522
523 pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
524 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
525 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
526}
527
528/**
529 * pmcraid_clr_trans_op - clear trans to op interrupt
530 *
531 * @pinstance: pointer to per adapter instance structure
532 *
533 * Return Value
534 * None
535 */
536static void pmcraid_clr_trans_op(
537 struct pmcraid_instance *pinstance
538)
539{
540 unsigned long lock_flags;
541
542 if (!pinstance->interrupt_mode) {
543 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
544 pinstance->int_regs.ioa_host_interrupt_mask_reg);
545 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
546 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
547 pinstance->int_regs.ioa_host_interrupt_clr_reg);
548 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
549 }
550
551 if (pinstance->reset_cmd != NULL) {
552 del_timer(&pinstance->reset_cmd->timer);
553 spin_lock_irqsave(
554 pinstance->host->host_lock, lock_flags);
555 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
556 spin_unlock_irqrestore(
557 pinstance->host->host_lock, lock_flags);
558 }
559}
560
561/**
562 * pmcraid_reset_type - Determine the required reset type
563 * @pinstance: pointer to adapter instance structure
564 *
565 * IOA requires hard reset if any of the following conditions is true.
566 * 1. If HRRQ valid interrupt is not masked
567 * 2. IOA reset alert doorbell is set
568 * 3. If there are any error interrupts
569 */
570static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
571{
572 u32 mask;
573 u32 intrs;
574 u32 alerts;
575
576 mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
577 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
578 alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
579
580 if ((mask & INTRS_HRRQ_VALID) == 0 ||
581 (alerts & DOORBELL_IOA_RESET_ALERT) ||
582 (intrs & PMCRAID_ERROR_INTERRUPTS)) {
583 pmcraid_info("IOA requires hard reset\n");
584 pinstance->ioa_hard_reset = 1;
585 }
586
587 /* If unit check is active, trigger the dump */
588 if (intrs & INTRS_IOA_UNIT_CHECK)
589 pinstance->ioa_unit_check = 1;
590}
591
592/**
593 * pmcraid_bist_done - completion function for PCI BIST
594 * @cmd: pointer to reset command
595 * Return Value
596 * none
597 */
598
599static void pmcraid_ioa_reset(struct pmcraid_cmd *);
600
601static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
602{
603 struct pmcraid_instance *pinstance = cmd->drv_inst;
604 unsigned long lock_flags;
605 int rc;
606 u16 pci_reg;
607
608 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
609
610 /* If PCI config space can't be accessed wait for another two secs */
611 if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
612 cmd->time_left > 0) {
613 pmcraid_info("BIST not complete, waiting another 2 secs\n");
614 cmd->timer.expires = jiffies + cmd->time_left;
615 cmd->time_left = 0;
616 cmd->timer.data = (unsigned long)cmd;
617 cmd->timer.function =
618 (void (*)(unsigned long))pmcraid_bist_done;
619 add_timer(&cmd->timer);
620 } else {
621 cmd->time_left = 0;
622 pmcraid_info("BIST is complete, proceeding with reset\n");
623 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
624 pmcraid_ioa_reset(cmd);
625 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
626 }
627}
628
629/**
630 * pmcraid_start_bist - starts BIST
631 * @cmd: pointer to reset cmd
632 * Return Value
633 * none
634 */
635static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
636{
637 struct pmcraid_instance *pinstance = cmd->drv_inst;
638 u32 doorbells, intrs;
639
640 /* proceed with bist and wait for 2 seconds */
641 iowrite32(DOORBELL_IOA_START_BIST,
642 pinstance->int_regs.host_ioa_interrupt_reg);
643 doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
644 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
645 pmcraid_info("doorbells after start bist: %x intrs: %x\n",
646 doorbells, intrs);
647
648 cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
649 cmd->timer.data = (unsigned long)cmd;
650 cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
651 cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
652 add_timer(&cmd->timer);
653}
654
655/**
656 * pmcraid_reset_alert_done - completion routine for reset_alert
657 * @cmd: pointer to command block used in reset sequence
658 * Return value
659 * None
660 */
661static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
662{
663 struct pmcraid_instance *pinstance = cmd->drv_inst;
664 u32 status = ioread32(pinstance->ioa_status);
665 unsigned long lock_flags;
666
667 /* if the critical operation in progress bit is set or the wait times
668 * out, invoke reset engine to proceed with hard reset. If there is
669 * some more time to wait, restart the timer
670 */
671 if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
672 cmd->time_left <= 0) {
673 pmcraid_info("critical op is reset proceeding with reset\n");
674 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
675 pmcraid_ioa_reset(cmd);
676 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
677 } else {
678 pmcraid_info("critical op is not yet reset waiting again\n");
679 /* restart timer if some more time is available to wait */
680 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
681 cmd->timer.data = (unsigned long)cmd;
682 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
683 cmd->timer.function =
684 (void (*)(unsigned long))pmcraid_reset_alert_done;
685 add_timer(&cmd->timer);
686 }
687}
688
689/**
690 * pmcraid_reset_alert - alerts IOA for a possible reset
691 * @cmd : command block to be used for reset sequence.
692 *
693 * Return Value
694 * returns 0 if pci config-space is accessible and RESET_DOORBELL is
695 * successfully written to IOA. Returns non-zero in case pci_config_space
696 * is not accessible
697 */
698static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
699static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
700{
701 struct pmcraid_instance *pinstance = cmd->drv_inst;
702 u32 doorbells;
703 int rc;
704 u16 pci_reg;
705
706 /* If we are able to access IOA PCI config space, alert IOA that we are
707 * going to reset it soon. This enables IOA to preserv persistent error
708 * data if any. In case memory space is not accessible, proceed with
709 * BIST or slot_reset
710 */
711 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
712 if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
713
714 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
715 * reset IOA doesn't generate any interrupts when CRITICAL
716 * OPERATION bit is reset. A timer is started to wait for this
717 * bit to be reset.
718 */
719 cmd->time_left = PMCRAID_RESET_TIMEOUT;
720 cmd->timer.data = (unsigned long)cmd;
721 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
722 cmd->timer.function =
723 (void (*)(unsigned long))pmcraid_reset_alert_done;
724 add_timer(&cmd->timer);
725
726 iowrite32(DOORBELL_IOA_RESET_ALERT,
727 pinstance->int_regs.host_ioa_interrupt_reg);
728 doorbells =
729 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
730 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
731 } else {
732 pmcraid_info("PCI config is not accessible starting BIST\n");
733 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
734 pmcraid_start_bist(cmd);
735 }
736}
737
738/**
739 * pmcraid_timeout_handler - Timeout handler for internally generated ops
740 *
741 * @cmd : pointer to command structure, that got timedout
742 *
743 * This function blocks host requests and initiates an adapter reset.
744 *
745 * Return value:
746 * None
747 */
748static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
749{
750 struct pmcraid_instance *pinstance = cmd->drv_inst;
751 unsigned long lock_flags;
752
753 dev_info(&pinstance->pdev->dev,
754 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
755 cmd->ioa_cb->ioarcb.cdb[0]);
756
757 /* Command timeouts result in hard reset sequence. The command that got
758 * timed out may be the one used as part of reset sequence. In this
759 * case restart reset sequence using the same command block even if
760 * reset is in progress. Otherwise fail this command and get a free
761 * command block to restart the reset sequence.
762 */
763 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
764 if (!pinstance->ioa_reset_in_progress) {
765 pinstance->ioa_reset_attempts = 0;
766 cmd = pmcraid_get_free_cmd(pinstance);
767
768 /* If we are out of command blocks, just return here itself.
769 * Some other command's timeout handler can do the reset job
770 */
771 if (cmd == NULL) {
772 spin_unlock_irqrestore(pinstance->host->host_lock,
773 lock_flags);
774 pmcraid_err("no free cmnd block for timeout handler\n");
775 return;
776 }
777
778 pinstance->reset_cmd = cmd;
779 pinstance->ioa_reset_in_progress = 1;
780 } else {
781 pmcraid_info("reset is already in progress\n");
782
783 if (pinstance->reset_cmd != cmd) {
784 /* This command should have been given to IOA, this
785 * command will be completed by fail_outstanding_cmds
786 * anyway
787 */
788 pmcraid_err("cmd is pending but reset in progress\n");
789 }
790
791 /* If this command was being used as part of the reset
792 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
793 * causes fail_outstanding_commands not to return the command
794 * block back to free pool
795 */
796 if (cmd == pinstance->reset_cmd)
797 cmd->cmd_done = pmcraid_ioa_reset;
798 }
799
800 /* Notify apps of important IOA bringup/bringdown sequences */
801 if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
802 pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
803 pmcraid_notify_ioastate(pinstance,
804 PMC_DEVICE_EVENT_RESET_START);
805
806 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
807 scsi_block_requests(pinstance->host);
808 pmcraid_reset_alert(cmd);
809 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
810}
811
812/**
813 * pmcraid_internal_done - completion routine for internally generated cmds
814 *
815 * @cmd: command that got response from IOA
816 *
817 * Return Value:
818 * none
819 */
820static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
821{
822 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
823 cmd->ioa_cb->ioarcb.cdb[0],
824 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
825
826 /* Some of the internal commands are sent with callers blocking for the
827 * response. Same will be indicated as part of cmd->completion_req
828 * field. Response path needs to wake up any waiters waiting for cmd
829 * completion if this flag is set.
830 */
831 if (cmd->completion_req) {
832 cmd->completion_req = 0;
833 complete(&cmd->wait_for_completion);
834 }
835
836 /* most of the internal commands are completed by caller itself, so
837 * no need to return the command block back to free pool until we are
838 * required to do so (e.g once done with initialization).
839 */
840 if (cmd->release) {
841 cmd->release = 0;
842 pmcraid_return_cmd(cmd);
843 }
844}
845
846/**
847 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
848 *
849 * @cmd: command that got response from IOA
850 *
851 * This routine is called after driver re-reads configuration table due to a
852 * lost CCN. It returns the command block back to free pool and schedules
853 * worker thread to add/delete devices into the system.
854 *
855 * Return Value:
856 * none
857 */
858static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
859{
860 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
861 cmd->ioa_cb->ioarcb.cdb[0],
862 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
863
864 if (cmd->release) {
865 cmd->release = 0;
866 pmcraid_return_cmd(cmd);
867 }
868 pmcraid_info("scheduling worker for config table reinitialization\n");
869 schedule_work(&cmd->drv_inst->worker_q);
870}
871
872/**
873 * pmcraid_erp_done - Process completion of SCSI error response from device
874 * @cmd: pmcraid_command
875 *
876 * This function copies the sense buffer into the scsi_cmd struct and completes
877 * scsi_cmd by calling scsi_done function.
878 *
879 * Return value:
880 * none
881 */
882static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
883{
884 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
885 struct pmcraid_instance *pinstance = cmd->drv_inst;
886 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
887
888 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
889 scsi_cmd->result |= (DID_ERROR << 16);
890 scmd_printk(KERN_INFO, scsi_cmd,
891 "command CDB[0] = %x failed with IOASC: 0x%08X\n",
892 cmd->ioa_cb->ioarcb.cdb[0], ioasc);
893 }
894
895 /* if we had allocated sense buffers for request sense, copy the sense
896 * release the buffers
897 */
898 if (cmd->sense_buffer != NULL) {
899 memcpy(scsi_cmd->sense_buffer,
900 cmd->sense_buffer,
901 SCSI_SENSE_BUFFERSIZE);
902 pci_free_consistent(pinstance->pdev,
903 SCSI_SENSE_BUFFERSIZE,
904 cmd->sense_buffer, cmd->sense_buffer_dma);
905 cmd->sense_buffer = NULL;
906 cmd->sense_buffer_dma = 0;
907 }
908
909 scsi_dma_unmap(scsi_cmd);
910 pmcraid_return_cmd(cmd);
911 scsi_cmd->scsi_done(scsi_cmd);
912}
913
914/**
915 * pmcraid_fire_command - sends an IOA command to adapter
916 *
917 * This function adds the given block into pending command list
918 * and returns without waiting
919 *
920 * @cmd : command to be sent to the device
921 *
922 * Return Value
923 * None
924 */
925static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
926{
927 struct pmcraid_instance *pinstance = cmd->drv_inst;
928 unsigned long lock_flags;
929
930 /* Add this command block to pending cmd pool. We do this prior to
931 * writting IOARCB to ioarrin because IOA might complete the command
932 * by the time we are about to add it to the list. Response handler
933 * (isr/tasklet) looks for cmd block in the pending pending list.
934 */
935 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
936 list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
937 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
938 atomic_inc(&pinstance->outstanding_cmds);
939
940 /* driver writes lower 32-bit value of IOARCB address only */
941 mb();
942 iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
943 pinstance->ioarrin);
944}
945
946/**
947 * pmcraid_send_cmd - fires a command to IOA
948 *
949 * This function also sets up timeout function, and command completion
950 * function
951 *
952 * @cmd: pointer to the command block to be fired to IOA
953 * @cmd_done: command completion function, called once IOA responds
954 * @timeout: timeout to wait for this command completion
955 * @timeout_func: timeout handler
956 *
957 * Return value
958 * none
959 */
960static void pmcraid_send_cmd(
961 struct pmcraid_cmd *cmd,
962 void (*cmd_done) (struct pmcraid_cmd *),
963 unsigned long timeout,
964 void (*timeout_func) (struct pmcraid_cmd *)
965)
966{
967 /* initialize done function */
968 cmd->cmd_done = cmd_done;
969
970 if (timeout_func) {
971 /* setup timeout handler */
972 cmd->timer.data = (unsigned long)cmd;
973 cmd->timer.expires = jiffies + timeout;
974 cmd->timer.function = (void (*)(unsigned long))timeout_func;
975 add_timer(&cmd->timer);
976 }
977
978 /* fire the command to IOA */
979 _pmcraid_fire_command(cmd);
980}
981
982/**
983 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
984 * @cmd: pointer to the command block used for sending IOA shutdown command
985 *
986 * Return value
987 * None
988 */
989static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
990{
991 struct pmcraid_instance *pinstance = cmd->drv_inst;
992 unsigned long lock_flags;
993
994 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
995 pmcraid_ioa_reset(cmd);
996 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
997}
998
999/**
1000 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
1001 *
1002 * @cmd: pointer to the command block used as part of reset sequence
1003 *
1004 * Return Value
1005 * None
1006 */
1007static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
1008{
1009 pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
1010 cmd->ioa_cb->ioarcb.cdb[0],
1011 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1012
1013 /* Note that commands sent during reset require next command to be sent
1014 * to IOA. Hence reinit the done function as well as timeout function
1015 */
1016 pmcraid_reinit_cmdblk(cmd);
1017 cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
1018 cmd->ioa_cb->ioarcb.resource_handle =
1019 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1020 cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
1021 cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
1022
1023 /* fire shutdown command to hardware. */
1024 pmcraid_info("firing normal shutdown command (%d) to IOA\n",
1025 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
1026
1027 pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
1028
1029 pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
1030 PMCRAID_SHUTDOWN_TIMEOUT,
1031 pmcraid_timeout_handler);
1032}
1033
1034/**
1035 * pmcraid_get_fwversion_done - completion function for get_fwversion
1036 *
1037 * @cmd: pointer to command block used to send INQUIRY command
1038 *
1039 * Return Value
1040 * none
1041 */
1042static void pmcraid_querycfg(struct pmcraid_cmd *);
1043
1044static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
1045{
1046 struct pmcraid_instance *pinstance = cmd->drv_inst;
1047 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1048 unsigned long lock_flags;
1049
1050 /* configuration table entry size depends on firmware version. If fw
1051 * version is not known, it is not possible to interpret IOA config
1052 * table
1053 */
1054 if (ioasc) {
1055 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
1056 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1057 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1058 pmcraid_reset_alert(cmd);
1059 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1060 } else {
1061 pmcraid_querycfg(cmd);
1062 }
1063}
1064
1065/**
1066 * pmcraid_get_fwversion - reads firmware version information
1067 *
1068 * @cmd: pointer to command block used to send INQUIRY command
1069 *
1070 * Return Value
1071 * none
1072 */
1073static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1074{
1075 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1076 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
1077 struct pmcraid_instance *pinstance = cmd->drv_inst;
1078 u16 data_size = sizeof(struct pmcraid_inquiry_data);
1079
1080 pmcraid_reinit_cmdblk(cmd);
1081 ioarcb->request_type = REQ_TYPE_SCSI;
1082 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1083 ioarcb->cdb[0] = INQUIRY;
1084 ioarcb->cdb[1] = 1;
1085 ioarcb->cdb[2] = 0xD0;
1086 ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1087 ioarcb->cdb[4] = data_size & 0xFF;
1088
1089 /* Since entire inquiry data it can be part of IOARCB itself
1090 */
1091 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1092 offsetof(struct pmcraid_ioarcb,
1093 add_data.u.ioadl[0]));
1094 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1095 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
1096
1097 ioarcb->request_flags0 |= NO_LINK_DESCS;
1098 ioarcb->data_transfer_length = cpu_to_le32(data_size);
1099 ioadl = &(ioarcb->add_data.u.ioadl[0]);
1100 ioadl->flags = IOADL_FLAGS_LAST_DESC;
1101 ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1102 ioadl->data_len = cpu_to_le32(data_size);
1103
1104 pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1105 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1106}
1107
1108/**
1109 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1110 * @cmd: pointer to command block to be used for identify hrrq
1111 *
1112 * Return Value
1113 * none
1114 */
1115static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1116{
1117 struct pmcraid_instance *pinstance = cmd->drv_inst;
1118 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1119 int index = cmd->hrrq_index;
1120 __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1121 u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1122 void (*done_function)(struct pmcraid_cmd *);
1123
1124 pmcraid_reinit_cmdblk(cmd);
1125 cmd->hrrq_index = index + 1;
1126
1127 if (cmd->hrrq_index < pinstance->num_hrrq) {
1128 done_function = pmcraid_identify_hrrq;
1129 } else {
1130 cmd->hrrq_index = 0;
1131 done_function = pmcraid_get_fwversion;
1132 }
1133
1134 /* Initialize ioarcb */
1135 ioarcb->request_type = REQ_TYPE_IOACMD;
1136 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1137
1138 /* initialize the hrrq number where IOA will respond to this command */
1139 ioarcb->hrrq_id = index;
1140 ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1141 ioarcb->cdb[1] = index;
1142
1143 /* IOA expects 64-bit pci address to be written in B.E format
1144 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1145 */
1146 pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1147 hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1148
1149 memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1150 memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1151
1152 /* Subsequent commands require HRRQ identification to be successful.
1153 * Note that this gets called even during reset from SCSI mid-layer
1154 * or tasklet
1155 */
1156 pmcraid_send_cmd(cmd, done_function,
1157 PMCRAID_INTERNAL_TIMEOUT,
1158 pmcraid_timeout_handler);
1159}
1160
1161static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1162static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1163
1164/**
1165 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1166 *
1167 * @cmd: initialized command block pointer
1168 *
1169 * Return Value
1170 * none
1171 */
1172static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1173{
1174 if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1175 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1176 else
1177 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1178
1179 pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1180}
1181
1182/**
1183 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1184 *
1185 * @pinstance: pointer to adapter instance structure
1186 * @type: HCAM type
1187 *
1188 * Return Value
1189 * pointer to initialized pmcraid_cmd structure or NULL
1190 */
1191static struct pmcraid_cmd *pmcraid_init_hcam
1192(
1193 struct pmcraid_instance *pinstance,
1194 u8 type
1195)
1196{
1197 struct pmcraid_cmd *cmd;
1198 struct pmcraid_ioarcb *ioarcb;
1199 struct pmcraid_ioadl_desc *ioadl;
1200 struct pmcraid_hostrcb *hcam;
1201 void (*cmd_done) (struct pmcraid_cmd *);
1202 dma_addr_t dma;
1203 int rcb_size;
1204
1205 cmd = pmcraid_get_free_cmd(pinstance);
1206
1207 if (!cmd) {
1208 pmcraid_err("no free command blocks for hcam\n");
1209 return cmd;
1210 }
1211
1212 if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1213 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1214 cmd_done = pmcraid_process_ccn;
1215 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1216 hcam = &pinstance->ccn;
1217 } else {
1218 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1219 cmd_done = pmcraid_process_ldn;
1220 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1221 hcam = &pinstance->ldn;
1222 }
1223
1224 /* initialize command pointer used for HCAM registration */
1225 hcam->cmd = cmd;
1226
1227 ioarcb = &cmd->ioa_cb->ioarcb;
1228 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1229 offsetof(struct pmcraid_ioarcb,
1230 add_data.u.ioadl[0]));
1231 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1232 ioadl = ioarcb->add_data.u.ioadl;
1233
1234 /* Initialize ioarcb */
1235 ioarcb->request_type = REQ_TYPE_HCAM;
1236 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1237 ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1238 ioarcb->cdb[1] = type;
1239 ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1240 ioarcb->cdb[8] = (rcb_size) & 0xFF;
1241
1242 ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1243
1244 ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1245 ioadl[0].data_len = cpu_to_le32(rcb_size);
1246 ioadl[0].address = cpu_to_le32(dma);
1247
1248 cmd->cmd_done = cmd_done;
1249 return cmd;
1250}
1251
1252/**
1253 * pmcraid_send_hcam - Send an HCAM to IOA
1254 * @pinstance: ioa config struct
1255 * @type: HCAM type
1256 *
1257 * This function will send a Host Controlled Async command to IOA.
1258 *
1259 * Return value:
1260 * none
1261 */
1262static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1263{
1264 struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1265 pmcraid_send_hcam_cmd(cmd);
1266}
1267
1268
1269/**
1270 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1271 *
1272 * @cmd: pointer to cmd that is used as cancelling command
1273 * @cmd_to_cancel: pointer to the command that needs to be cancelled
1274 */
1275static void pmcraid_prepare_cancel_cmd(
1276 struct pmcraid_cmd *cmd,
1277 struct pmcraid_cmd *cmd_to_cancel
1278)
1279{
1280 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1281 __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
1282
1283 /* Get the resource handle to where the command to be aborted has been
1284 * sent.
1285 */
1286 ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1287 ioarcb->request_type = REQ_TYPE_IOACMD;
1288 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1289 ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1290
1291 /* IOARCB address of the command to be cancelled is given in
1292 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1293 * IOARCB address are not masked.
1294 */
1295 ioarcb_addr = cpu_to_be64(ioarcb_addr);
1296 memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1297}
1298
1299/**
1300 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1301 *
1302 * @cmd: command to be used as cancelling command
1303 * @type: HCAM type
1304 * @cmd_done: op done function for the cancelling command
1305 */
1306static void pmcraid_cancel_hcam(
1307 struct pmcraid_cmd *cmd,
1308 u8 type,
1309 void (*cmd_done) (struct pmcraid_cmd *)
1310)
1311{
1312 struct pmcraid_instance *pinstance;
1313 struct pmcraid_hostrcb *hcam;
1314
1315 pinstance = cmd->drv_inst;
1316 hcam = (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1317 &pinstance->ldn : &pinstance->ccn;
1318
1319 /* prepare for cancelling previous hcam command. If the HCAM is
1320 * currently not pending with IOA, we would have hcam->cmd as non-null
1321 */
1322 if (hcam->cmd == NULL)
1323 return;
1324
1325 pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1326
1327 /* writing to IOARRIN must be protected by host_lock, as mid-layer
1328 * schedule queuecommand while we are doing this
1329 */
1330 pmcraid_send_cmd(cmd, cmd_done,
1331 PMCRAID_INTERNAL_TIMEOUT,
1332 pmcraid_timeout_handler);
1333}
1334
1335/**
1336 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1337 *
1338 * @cmd: command block to be used for cancelling the HCAM
1339 */
1340static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1341{
1342 pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1343 cmd->ioa_cb->ioarcb.cdb[0],
1344 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1345
1346 pmcraid_reinit_cmdblk(cmd);
1347
1348 pmcraid_cancel_hcam(cmd,
1349 PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1350 pmcraid_ioa_shutdown);
1351}
1352
1353/**
1354 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1355 *
1356 * @cmd: command block to be used for cancelling the HCAM
1357 */
1358static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1359{
1360 pmcraid_cancel_hcam(cmd,
1361 PMCRAID_HCAM_CODE_LOG_DATA,
1362 pmcraid_cancel_ccn);
1363}
1364
1365/**
1366 * pmcraid_expose_resource - check if the resource can be exposed to OS
1367 *
1368 * @fw_version: firmware version code
1369 * @cfgte: pointer to configuration table entry of the resource
1370 *
1371 * Return value:
1372 * true if resource can be added to midlayer, false(0) otherwise
1373 */
1374static int pmcraid_expose_resource(u16 fw_version,
1375 struct pmcraid_config_table_entry *cfgte)
1376{
1377 int retval = 0;
1378
1379 if (cfgte->resource_type == RES_TYPE_VSET) {
1380 if (fw_version <= PMCRAID_FW_VERSION_1)
1381 retval = ((cfgte->unique_flags1 & 0x80) == 0);
1382 else
1383 retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1384 (cfgte->unique_flags1 & 0x80) == 0);
1385
1386 } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1387 retval = (RES_BUS(cfgte->resource_address) !=
1388 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1389 return retval;
1390}
1391
1392/* attributes supported by pmcraid_event_family */
1393enum {
1394 PMCRAID_AEN_ATTR_UNSPEC,
1395 PMCRAID_AEN_ATTR_EVENT,
1396 __PMCRAID_AEN_ATTR_MAX,
1397};
1398#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1399
1400/* commands supported by pmcraid_event_family */
1401enum {
1402 PMCRAID_AEN_CMD_UNSPEC,
1403 PMCRAID_AEN_CMD_EVENT,
1404 __PMCRAID_AEN_CMD_MAX,
1405};
1406#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1407
1408static struct genl_family pmcraid_event_family = {
1409 .id = GENL_ID_GENERATE,
1410 .name = "pmcraid",
1411 .version = 1,
1412 .maxattr = PMCRAID_AEN_ATTR_MAX
1413};
1414
1415/**
1416 * pmcraid_netlink_init - registers pmcraid_event_family
1417 *
1418 * Return value:
1419 * 0 if the pmcraid_event_family is successfully registered
1420 * with netlink generic, non-zero otherwise
1421 */
1422static int pmcraid_netlink_init(void)
1423{
1424 int result;
1425
1426 result = genl_register_family(&pmcraid_event_family);
1427
1428 if (result)
1429 return result;
1430
1431 pmcraid_info("registered NETLINK GENERIC group: %d\n",
1432 pmcraid_event_family.id);
1433
1434 return result;
1435}
1436
1437/**
1438 * pmcraid_netlink_release - unregisters pmcraid_event_family
1439 *
1440 * Return value:
1441 * none
1442 */
1443static void pmcraid_netlink_release(void)
1444{
1445 genl_unregister_family(&pmcraid_event_family);
1446}
1447
1448/**
1449 * pmcraid_notify_aen - sends event msg to user space application
1450 * @pinstance: pointer to adapter instance structure
1451 * @type: HCAM type
1452 *
1453 * Return value:
1454 * 0 if success, error value in case of any failure.
1455 */
1456static int pmcraid_notify_aen(
1457 struct pmcraid_instance *pinstance,
1458 struct pmcraid_aen_msg *aen_msg,
1459 u32 data_size
1460)
1461{
1462 struct sk_buff *skb;
1463 void *msg_header;
1464 u32 total_size, nla_genl_hdr_total_size;
1465 int result;
1466
1467 aen_msg->hostno = (pinstance->host->unique_id << 16 |
1468 MINOR(pinstance->cdev.dev));
1469 aen_msg->length = data_size;
1470
1471 data_size += sizeof(*aen_msg);
1472
1473 total_size = nla_total_size(data_size);
1474 /* Add GENL_HDR to total_size */
1475 nla_genl_hdr_total_size =
1476 (total_size + (GENL_HDRLEN +
1477 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1478 + NLMSG_HDRLEN);
1479 skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1480
1481
1482 if (!skb) {
1483 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1484 total_size);
1485 return -ENOMEM;
1486 }
1487
1488 /* add the genetlink message header */
1489 msg_header = genlmsg_put(skb, 0, 0,
1490 &pmcraid_event_family, 0,
1491 PMCRAID_AEN_CMD_EVENT);
1492 if (!msg_header) {
1493 pmcraid_err("failed to copy command details\n");
1494 nlmsg_free(skb);
1495 return -ENOMEM;
1496 }
1497
1498 result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1499
1500 if (result) {
1501 pmcraid_err("failed to copy AEN attribute data\n");
1502 nlmsg_free(skb);
1503 return -EINVAL;
1504 }
1505
1506 /* send genetlink multicast message to notify appplications */
1507 result = genlmsg_end(skb, msg_header);
1508
1509 if (result < 0) {
1510 pmcraid_err("genlmsg_end failed\n");
1511 nlmsg_free(skb);
1512 return result;
1513 }
1514
1515 result =
1516 genlmsg_multicast(skb, 0, pmcraid_event_family.id, GFP_ATOMIC);
1517
1518 /* If there are no listeners, genlmsg_multicast may return non-zero
1519 * value.
1520 */
1521 if (result)
1522 pmcraid_info("error (%x) sending aen event message\n", result);
1523 return result;
1524}
1525
1526/**
1527 * pmcraid_notify_ccn - notifies about CCN event msg to user space
1528 * @pinstance: pointer adapter instance structure
1529 *
1530 * Return value:
1531 * 0 if success, error value in case of any failure
1532 */
1533static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1534{
1535 return pmcraid_notify_aen(pinstance,
1536 pinstance->ccn.msg,
1537 pinstance->ccn.hcam->data_len +
1538 sizeof(struct pmcraid_hcam_hdr));
1539}
1540
1541/**
1542 * pmcraid_notify_ldn - notifies about CCN event msg to user space
1543 * @pinstance: pointer adapter instance structure
1544 *
1545 * Return value:
1546 * 0 if success, error value in case of any failure
1547 */
1548static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1549{
1550 return pmcraid_notify_aen(pinstance,
1551 pinstance->ldn.msg,
1552 pinstance->ldn.hcam->data_len +
1553 sizeof(struct pmcraid_hcam_hdr));
1554}
1555
1556/**
1557 * pmcraid_notify_ioastate - sends IOA state event msg to user space
1558 * @pinstance: pointer adapter instance structure
1559 * @evt: controller state event to be sent
1560 *
1561 * Return value:
1562 * 0 if success, error value in case of any failure
1563 */
1564static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1565{
1566 pinstance->scn.ioa_state = evt;
1567 pmcraid_notify_aen(pinstance,
1568 &pinstance->scn.msg,
1569 sizeof(u32));
1570}
1571
1572/**
1573 * pmcraid_handle_config_change - Handle a config change from the adapter
1574 * @pinstance: pointer to per adapter instance structure
1575 *
1576 * Return value:
1577 * none
1578 */
1579
1580static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1581{
1582 struct pmcraid_config_table_entry *cfg_entry;
1583 struct pmcraid_hcam_ccn *ccn_hcam;
1584 struct pmcraid_cmd *cmd;
1585 struct pmcraid_cmd *cfgcmd;
1586 struct pmcraid_resource_entry *res = NULL;
1587 unsigned long lock_flags;
1588 unsigned long host_lock_flags;
1589 u32 new_entry = 1;
1590 u32 hidden_entry = 0;
1591 u16 fw_version;
1592 int rc;
1593
1594 ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1595 cfg_entry = &ccn_hcam->cfg_entry;
1596 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1597
1598 pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1599 res: %x:%x:%x:%x\n",
1600 pinstance->ccn.hcam->ilid,
1601 pinstance->ccn.hcam->op_code,
1602 ((pinstance->ccn.hcam->timestamp1) |
1603 ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
1604 pinstance->ccn.hcam->notification_type,
1605 pinstance->ccn.hcam->notification_lost,
1606 pinstance->ccn.hcam->flags,
1607 pinstance->host->unique_id,
1608 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1609 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1610 RES_BUS(cfg_entry->resource_address)),
1611 RES_IS_VSET(*cfg_entry) ?
1612 (fw_version <= PMCRAID_FW_VERSION_1 ?
1613 cfg_entry->unique_flags1 :
1614 cfg_entry->array_id & 0xFF) :
1615 RES_TARGET(cfg_entry->resource_address),
1616 RES_LUN(cfg_entry->resource_address));
1617
1618
1619 /* If this HCAM indicates a lost notification, read the config table */
1620 if (pinstance->ccn.hcam->notification_lost) {
1621 cfgcmd = pmcraid_get_free_cmd(pinstance);
1622 if (cfgcmd) {
1623 pmcraid_info("lost CCN, reading config table\b");
1624 pinstance->reinit_cfg_table = 1;
1625 pmcraid_querycfg(cfgcmd);
1626 } else {
1627 pmcraid_err("lost CCN, no free cmd for querycfg\n");
1628 }
1629 goto out_notify_apps;
1630 }
1631
1632 /* If this resource is not going to be added to mid-layer, just notify
1633 * applications and return. If this notification is about hiding a VSET
1634 * resource, check if it was exposed already.
1635 */
1636 if (pinstance->ccn.hcam->notification_type ==
1637 NOTIFICATION_TYPE_ENTRY_CHANGED &&
1638 cfg_entry->resource_type == RES_TYPE_VSET) {
1639
1640 if (fw_version <= PMCRAID_FW_VERSION_1)
1641 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1642 else
1643 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1644
1645 } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1646 goto out_notify_apps;
1647 }
1648
1649 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1650 list_for_each_entry(res, &pinstance->used_res_q, queue) {
1651 rc = memcmp(&res->cfg_entry.resource_address,
1652 &cfg_entry->resource_address,
1653 sizeof(cfg_entry->resource_address));
1654 if (!rc) {
1655 new_entry = 0;
1656 break;
1657 }
1658 }
1659
1660 if (new_entry) {
1661
1662 if (hidden_entry) {
1663 spin_unlock_irqrestore(&pinstance->resource_lock,
1664 lock_flags);
1665 goto out_notify_apps;
1666 }
1667
1668 /* If there are more number of resources than what driver can
1669 * manage, do not notify the applications about the CCN. Just
1670 * ignore this notifications and re-register the same HCAM
1671 */
1672 if (list_empty(&pinstance->free_res_q)) {
1673 spin_unlock_irqrestore(&pinstance->resource_lock,
1674 lock_flags);
1675 pmcraid_err("too many resources attached\n");
1676 spin_lock_irqsave(pinstance->host->host_lock,
1677 host_lock_flags);
1678 pmcraid_send_hcam(pinstance,
1679 PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1680 spin_unlock_irqrestore(pinstance->host->host_lock,
1681 host_lock_flags);
1682 return;
1683 }
1684
1685 res = list_entry(pinstance->free_res_q.next,
1686 struct pmcraid_resource_entry, queue);
1687
1688 list_del(&res->queue);
1689 res->scsi_dev = NULL;
1690 res->reset_progress = 0;
1691 list_add_tail(&res->queue, &pinstance->used_res_q);
1692 }
1693
1694 memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1695
1696 if (pinstance->ccn.hcam->notification_type ==
1697 NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1698 if (res->scsi_dev) {
1699 if (fw_version <= PMCRAID_FW_VERSION_1)
1700 res->cfg_entry.unique_flags1 &= 0x7F;
1701 else
1702 res->cfg_entry.array_id &= 0xFF;
1703 res->change_detected = RES_CHANGE_DEL;
1704 res->cfg_entry.resource_handle =
1705 PMCRAID_INVALID_RES_HANDLE;
1706 schedule_work(&pinstance->worker_q);
1707 } else {
1708 /* This may be one of the non-exposed resources */
1709 list_move_tail(&res->queue, &pinstance->free_res_q);
1710 }
1711 } else if (!res->scsi_dev) {
1712 res->change_detected = RES_CHANGE_ADD;
1713 schedule_work(&pinstance->worker_q);
1714 }
1715 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1716
1717out_notify_apps:
1718
1719 /* Notify configuration changes to registered applications.*/
1720 if (!pmcraid_disable_aen)
1721 pmcraid_notify_ccn(pinstance);
1722
1723 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1724 if (cmd)
1725 pmcraid_send_hcam_cmd(cmd);
1726}
1727
1728/**
1729 * pmcraid_get_error_info - return error string for an ioasc
1730 * @ioasc: ioasc code
1731 * Return Value
1732 * none
1733 */
1734static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1735{
1736 int i;
1737 for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1738 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1739 return &pmcraid_ioasc_error_table[i];
1740 }
1741 return NULL;
1742}
1743
1744/**
1745 * pmcraid_ioasc_logger - log IOASC information based user-settings
1746 * @ioasc: ioasc code
1747 * @cmd: pointer to command that resulted in 'ioasc'
1748 */
1749void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1750{
1751 struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1752
1753 if (error_info == NULL ||
1754 cmd->drv_inst->current_log_level < error_info->log_level)
1755 return;
1756
1757 /* log the error string */
1758 pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1759 cmd->ioa_cb->ioarcb.cdb[0],
1760 cmd->ioa_cb->ioarcb.resource_handle,
1761 le32_to_cpu(ioasc), error_info->error_string);
1762}
1763
1764/**
1765 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1766 *
1767 * @pinstance: pointer to per adapter instance structure
1768 *
1769 * Return value:
1770 * none
1771 */
1772static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1773{
1774 struct pmcraid_hcam_ldn *hcam_ldn;
1775 u32 ioasc;
1776
1777 hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1778
1779 pmcraid_info
1780 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1781 pinstance->ldn.hcam->ilid,
1782 pinstance->ldn.hcam->op_code,
1783 pinstance->ldn.hcam->notification_type,
1784 pinstance->ldn.hcam->notification_lost,
1785 pinstance->ldn.hcam->flags,
1786 pinstance->ldn.hcam->overlay_id);
1787
1788 /* log only the errors, no need to log informational log entries */
1789 if (pinstance->ldn.hcam->notification_type !=
1790 NOTIFICATION_TYPE_ERROR_LOG)
1791 return;
1792
1793 if (pinstance->ldn.hcam->notification_lost ==
1794 HOSTRCB_NOTIFICATIONS_LOST)
1795 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1796
1797 ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1798
1799 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1800 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1801 dev_info(&pinstance->pdev->dev,
1802 "UnitAttention due to IOA Bus Reset\n");
1803 scsi_report_bus_reset(
1804 pinstance->host,
1805 RES_BUS(hcam_ldn->error_log.fd_ra));
1806 }
1807
1808 return;
1809}
1810
1811/**
1812 * pmcraid_process_ccn - Op done function for a CCN.
1813 * @cmd: pointer to command struct
1814 *
1815 * This function is the op done function for a configuration
1816 * change notification
1817 *
1818 * Return value:
1819 * none
1820 */
1821static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1822{
1823 struct pmcraid_instance *pinstance = cmd->drv_inst;
1824 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1825 unsigned long lock_flags;
1826
1827 pinstance->ccn.cmd = NULL;
1828 pmcraid_return_cmd(cmd);
1829
1830 /* If driver initiated IOA reset happened while this hcam was pending
1831 * with IOA, or IOA bringdown sequence is in progress, no need to
1832 * re-register the hcam
1833 */
1834 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1835 atomic_read(&pinstance->ccn.ignore) == 1) {
1836 return;
1837 } else if (ioasc) {
1838 dev_info(&pinstance->pdev->dev,
1839 "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1840 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1841 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1842 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1843 } else {
1844 pmcraid_handle_config_change(pinstance);
1845 }
1846}
1847
1848/**
1849 * pmcraid_process_ldn - op done function for an LDN
1850 * @cmd: pointer to command block
1851 *
1852 * Return value
1853 * none
1854 */
1855static void pmcraid_initiate_reset(struct pmcraid_instance *);
1856static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1857
1858static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1859{
1860 struct pmcraid_instance *pinstance = cmd->drv_inst;
1861 struct pmcraid_hcam_ldn *ldn_hcam =
1862 (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1863 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1864 u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1865 unsigned long lock_flags;
1866
1867 /* return the command block back to freepool */
1868 pinstance->ldn.cmd = NULL;
1869 pmcraid_return_cmd(cmd);
1870
1871 /* If driver initiated IOA reset happened while this hcam was pending
1872 * with IOA, no need to re-register the hcam as reset engine will do it
1873 * once reset sequence is complete
1874 */
1875 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1876 atomic_read(&pinstance->ccn.ignore) == 1) {
1877 return;
1878 } else if (!ioasc) {
1879 pmcraid_handle_error_log(pinstance);
1880 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1881 spin_lock_irqsave(pinstance->host->host_lock,
1882 lock_flags);
1883 pmcraid_initiate_reset(pinstance);
1884 spin_unlock_irqrestore(pinstance->host->host_lock,
1885 lock_flags);
1886 return;
1887 }
1888 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1889 pinstance->timestamp_error = 1;
1890 pmcraid_set_timestamp(cmd);
1891 }
1892 } else {
1893 dev_info(&pinstance->pdev->dev,
1894 "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1895 }
1896 /* send netlink message for HCAM notification if enabled */
1897 if (!pmcraid_disable_aen)
1898 pmcraid_notify_ldn(pinstance);
1899
1900 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1901 if (cmd)
1902 pmcraid_send_hcam_cmd(cmd);
1903}
1904
1905/**
1906 * pmcraid_register_hcams - register HCAMs for CCN and LDN
1907 *
1908 * @pinstance: pointer per adapter instance structure
1909 *
1910 * Return Value
1911 * none
1912 */
1913static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1914{
1915 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1916 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1917}
1918
1919/**
1920 * pmcraid_unregister_hcams - cancel HCAMs registered already
1921 * @cmd: pointer to command used as part of reset sequence
1922 */
1923static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1924{
1925 struct pmcraid_instance *pinstance = cmd->drv_inst;
1926
1927 /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1928 * handling hcam response though it is not necessary. In order to
1929 * prevent this, set 'ignore', so that bring-down sequence doesn't
1930 * re-send any more hcams
1931 */
1932 atomic_set(&pinstance->ccn.ignore, 1);
1933 atomic_set(&pinstance->ldn.ignore, 1);
1934
1935 /* If adapter reset was forced as part of runtime reset sequence,
1936 * start the reset sequence. Reset will be triggered even in case
1937 * IOA unit_check.
1938 */
1939 if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1940 pinstance->ioa_unit_check) {
1941 pinstance->force_ioa_reset = 0;
1942 pinstance->ioa_unit_check = 0;
1943 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1944 pmcraid_reset_alert(cmd);
1945 return;
1946 }
1947
1948 /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1949 * one after the other. So CCN cancellation will be triggered by
1950 * pmcraid_cancel_ldn itself.
1951 */
1952 pmcraid_cancel_ldn(cmd);
1953}
1954
1955/**
1956 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1957 * @pinstance: pointer to adapter instance structure
1958 * Return Value
1959 * 1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1960 */
1961static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1962
1963static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1964{
1965 u32 intrs;
1966
1967 pmcraid_reinit_buffers(pinstance);
1968 intrs = pmcraid_read_interrupts(pinstance);
1969
1970 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1971
1972 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1973 if (!pinstance->interrupt_mode) {
1974 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1975 pinstance->int_regs.
1976 ioa_host_interrupt_mask_reg);
1977 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1978 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1979 }
1980 return 1;
1981 } else {
1982 return 0;
1983 }
1984}
1985
1986/**
1987 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1988 * @cmd : pointer to reset command block
1989 *
1990 * Return Value
1991 * none
1992 */
1993static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1994{
1995 struct pmcraid_instance *pinstance = cmd->drv_inst;
1996 u32 int_reg;
1997 u32 doorbell;
1998
1999 /* There will be an interrupt when Transition to Operational bit is
2000 * set so tasklet would execute next reset task. The timeout handler
2001 * would re-initiate a reset
2002 */
2003 cmd->cmd_done = pmcraid_ioa_reset;
2004 cmd->timer.data = (unsigned long)cmd;
2005 cmd->timer.expires = jiffies +
2006 msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
2007 cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
2008
2009 if (!timer_pending(&cmd->timer))
2010 add_timer(&cmd->timer);
2011
2012 /* Enable destructive diagnostics on IOA if it is not yet in
2013 * operational state
2014 */
2015 doorbell = DOORBELL_RUNTIME_RESET |
2016 DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
2017
2018 /* Since we do RESET_ALERT and Start BIST we have to again write
2019 * MSIX Doorbell to indicate the interrupt mode
2020 */
2021 if (pinstance->interrupt_mode) {
2022 iowrite32(DOORBELL_INTR_MODE_MSIX,
2023 pinstance->int_regs.host_ioa_interrupt_reg);
2024 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
2025 }
2026
2027 iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
2028 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2029 int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
2030
2031 pmcraid_info("Waiting for IOA to become operational %x:%x\n",
2032 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2033 int_reg);
2034}
2035
2036/**
2037 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
2038 *
2039 * @pinstance: pointer to adapter instance structure
2040 *
2041 * Return Value
2042 * none
2043 */
2044static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
2045{
2046 pmcraid_info("%s is not yet implemented\n", __func__);
2047}
2048
2049/**
2050 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
2051 * @pinstance: pointer to adapter instance structure
2052 *
2053 * This function fails all outstanding ops. If they are submitted to IOA
2054 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
2055 * otherwise just completes the commands and returns the cmd blocks to free
2056 * pool.
2057 *
2058 * Return value:
2059 * none
2060 */
2061static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
2062{
2063 struct pmcraid_cmd *cmd, *temp;
2064 unsigned long lock_flags;
2065
2066 /* pending command list is protected by pending_pool_lock. Its
2067 * traversal must be done as within this lock
2068 */
2069 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2070 list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
2071 free_list) {
2072 list_del(&cmd->free_list);
2073 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2074 lock_flags);
2075 cmd->ioa_cb->ioasa.ioasc =
2076 cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
2077 cmd->ioa_cb->ioasa.ilid =
2078 cpu_to_be32(PMCRAID_DRIVER_ILID);
2079
2080 /* In case the command timer is still running */
2081 del_timer(&cmd->timer);
2082
2083 /* If this is an IO command, complete it by invoking scsi_done
2084 * function. If this is one of the internal commands other
2085 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2086 * complete it
2087 */
2088 if (cmd->scsi_cmd) {
2089
2090 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2091 __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2092
2093 scsi_cmd->result |= DID_ERROR << 16;
2094
2095 scsi_dma_unmap(scsi_cmd);
2096 pmcraid_return_cmd(cmd);
2097
2098 pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2099 le32_to_cpu(resp) >> 2,
2100 cmd->ioa_cb->ioarcb.cdb[0],
2101 scsi_cmd->result);
2102 scsi_cmd->scsi_done(scsi_cmd);
2103 } else if (cmd->cmd_done == pmcraid_internal_done ||
2104 cmd->cmd_done == pmcraid_erp_done) {
2105 cmd->cmd_done(cmd);
2106 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2107 cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2108 pmcraid_return_cmd(cmd);
2109 }
2110
2111 atomic_dec(&pinstance->outstanding_cmds);
2112 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2113 }
2114
2115 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2116}
2117
2118/**
2119 * pmcraid_ioa_reset - Implementation of IOA reset logic
2120 *
2121 * @cmd: pointer to the cmd block to be used for entire reset process
2122 *
2123 * This function executes most of the steps required for IOA reset. This gets
2124 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2125 * 'eh_' thread. Access to variables used for controlling the reset sequence is
2126 * synchronized using host lock. Various functions called during reset process
2127 * would make use of a single command block, pointer to which is also stored in
2128 * adapter instance structure.
2129 *
2130 * Return Value
2131 * None
2132 */
2133static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2134{
2135 struct pmcraid_instance *pinstance = cmd->drv_inst;
2136 u8 reset_complete = 0;
2137
2138 pinstance->ioa_reset_in_progress = 1;
2139
2140 if (pinstance->reset_cmd != cmd) {
2141 pmcraid_err("reset is called with different command block\n");
2142 pinstance->reset_cmd = cmd;
2143 }
2144
2145 pmcraid_info("reset_engine: state = %d, command = %p\n",
2146 pinstance->ioa_state, cmd);
2147
2148 switch (pinstance->ioa_state) {
2149
2150 case IOA_STATE_DEAD:
2151 /* If IOA is offline, whatever may be the reset reason, just
2152 * return. callers might be waiting on the reset wait_q, wake
2153 * up them
2154 */
2155 pmcraid_err("IOA is offline no reset is possible\n");
2156 reset_complete = 1;
2157 break;
2158
2159 case IOA_STATE_IN_BRINGDOWN:
2160 /* we enter here, once ioa shutdown command is processed by IOA
2161 * Alert IOA for a possible reset. If reset alert fails, IOA
2162 * goes through hard-reset
2163 */
2164 pmcraid_disable_interrupts(pinstance, ~0);
2165 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2166 pmcraid_reset_alert(cmd);
2167 break;
2168
2169 case IOA_STATE_UNKNOWN:
2170 /* We may be called during probe or resume. Some pre-processing
2171 * is required for prior to reset
2172 */
2173 scsi_block_requests(pinstance->host);
2174
2175 /* If asked to reset while IOA was processing responses or
2176 * there are any error responses then IOA may require
2177 * hard-reset.
2178 */
2179 if (pinstance->ioa_hard_reset == 0) {
2180 if (ioread32(pinstance->ioa_status) &
2181 INTRS_TRANSITION_TO_OPERATIONAL) {
2182 pmcraid_info("sticky bit set, bring-up\n");
2183 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2184 pmcraid_reinit_cmdblk(cmd);
2185 pmcraid_identify_hrrq(cmd);
2186 } else {
2187 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2188 pmcraid_soft_reset(cmd);
2189 }
2190 } else {
2191 /* Alert IOA of a possible reset and wait for critical
2192 * operation in progress bit to reset
2193 */
2194 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2195 pmcraid_reset_alert(cmd);
2196 }
2197 break;
2198
2199 case IOA_STATE_IN_RESET_ALERT:
2200 /* If critical operation in progress bit is reset or wait gets
2201 * timed out, reset proceeds with starting BIST on the IOA.
2202 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2203 * they are 3 or more, reset engine marks IOA dead and returns
2204 */
2205 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2206 pmcraid_start_bist(cmd);
2207 break;
2208
2209 case IOA_STATE_IN_HARD_RESET:
2210 pinstance->ioa_reset_attempts++;
2211
2212 /* retry reset if we haven't reached maximum allowed limit */
2213 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2214 pinstance->ioa_reset_attempts = 0;
2215 pmcraid_err("IOA didn't respond marking it as dead\n");
2216 pinstance->ioa_state = IOA_STATE_DEAD;
2217
2218 if (pinstance->ioa_bringdown)
2219 pmcraid_notify_ioastate(pinstance,
2220 PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2221 else
2222 pmcraid_notify_ioastate(pinstance,
2223 PMC_DEVICE_EVENT_RESET_FAILED);
2224 reset_complete = 1;
2225 break;
2226 }
2227
2228 /* Once either bist or pci reset is done, restore PCI config
2229 * space. If this fails, proceed with hard reset again
2230 */
2231 pci_restore_state(pinstance->pdev);
2232
2233 /* fail all pending commands */
2234 pmcraid_fail_outstanding_cmds(pinstance);
2235
2236 /* check if unit check is active, if so extract dump */
2237 if (pinstance->ioa_unit_check) {
2238 pmcraid_info("unit check is active\n");
2239 pinstance->ioa_unit_check = 0;
2240 pmcraid_get_dump(pinstance);
2241 pinstance->ioa_reset_attempts--;
2242 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2243 pmcraid_reset_alert(cmd);
2244 break;
2245 }
2246
2247 /* if the reset reason is to bring-down the ioa, we might be
2248 * done with the reset restore pci_config_space and complete
2249 * the reset
2250 */
2251 if (pinstance->ioa_bringdown) {
2252 pmcraid_info("bringing down the adapter\n");
2253 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2254 pinstance->ioa_bringdown = 0;
2255 pinstance->ioa_state = IOA_STATE_UNKNOWN;
2256 pmcraid_notify_ioastate(pinstance,
2257 PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2258 reset_complete = 1;
2259 } else {
2260 /* bring-up IOA, so proceed with soft reset
2261 * Reinitialize hrrq_buffers and their indices also
2262 * enable interrupts after a pci_restore_state
2263 */
2264 if (pmcraid_reset_enable_ioa(pinstance)) {
2265 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2266 pmcraid_info("bringing up the adapter\n");
2267 pmcraid_reinit_cmdblk(cmd);
2268 pmcraid_identify_hrrq(cmd);
2269 } else {
2270 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2271 pmcraid_soft_reset(cmd);
2272 }
2273 }
2274 break;
2275
2276 case IOA_STATE_IN_SOFT_RESET:
2277 /* TRANSITION TO OPERATIONAL is on so start initialization
2278 * sequence
2279 */
2280 pmcraid_info("In softreset proceeding with bring-up\n");
2281 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2282
2283 /* Initialization commands start with HRRQ identification. From
2284 * now on tasklet completes most of the commands as IOA is up
2285 * and intrs are enabled
2286 */
2287 pmcraid_identify_hrrq(cmd);
2288 break;
2289
2290 case IOA_STATE_IN_BRINGUP:
2291 /* we are done with bringing up of IOA, change the ioa_state to
2292 * operational and wake up any waiters
2293 */
2294 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2295 reset_complete = 1;
2296 break;
2297
2298 case IOA_STATE_OPERATIONAL:
2299 default:
2300 /* When IOA is operational and a reset is requested, check for
2301 * the reset reason. If reset is to bring down IOA, unregister
2302 * HCAMs and initiate shutdown; if adapter reset is forced then
2303 * restart reset sequence again
2304 */
2305 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2306 pinstance->force_ioa_reset == 0) {
2307 pmcraid_notify_ioastate(pinstance,
2308 PMC_DEVICE_EVENT_RESET_SUCCESS);
2309 reset_complete = 1;
2310 } else {
2311 if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2312 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2313 pmcraid_reinit_cmdblk(cmd);
2314 pmcraid_unregister_hcams(cmd);
2315 }
2316 break;
2317 }
2318
2319 /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2320 * OPERATIONAL. Reset all control variables used during reset, wake up
2321 * any waiting threads and let the SCSI mid-layer send commands. Note
2322 * that host_lock must be held before invoking scsi_report_bus_reset.
2323 */
2324 if (reset_complete) {
2325 pinstance->ioa_reset_in_progress = 0;
2326 pinstance->ioa_reset_attempts = 0;
2327 pinstance->reset_cmd = NULL;
2328 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2329 pinstance->ioa_bringdown = 0;
2330 pmcraid_return_cmd(cmd);
2331
2332 /* If target state is to bring up the adapter, proceed with
2333 * hcam registration and resource exposure to mid-layer.
2334 */
2335 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2336 pmcraid_register_hcams(pinstance);
2337
2338 wake_up_all(&pinstance->reset_wait_q);
2339 }
2340
2341 return;
2342}
2343
2344/**
2345 * pmcraid_initiate_reset - initiates reset sequence. This is called from
2346 * ISR/tasklet during error interrupts including IOA unit check. If reset
2347 * is already in progress, it just returns, otherwise initiates IOA reset
2348 * to bring IOA up to operational state.
2349 *
2350 * @pinstance: pointer to adapter instance structure
2351 *
2352 * Return value
2353 * none
2354 */
2355static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2356{
2357 struct pmcraid_cmd *cmd;
2358
2359 /* If the reset is already in progress, just return, otherwise start
2360 * reset sequence and return
2361 */
2362 if (!pinstance->ioa_reset_in_progress) {
2363 scsi_block_requests(pinstance->host);
2364 cmd = pmcraid_get_free_cmd(pinstance);
2365
2366 if (cmd == NULL) {
2367 pmcraid_err("no cmnd blocks for initiate_reset\n");
2368 return;
2369 }
2370
2371 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2372 pinstance->reset_cmd = cmd;
2373 pinstance->force_ioa_reset = 1;
2374 pmcraid_notify_ioastate(pinstance,
2375 PMC_DEVICE_EVENT_RESET_START);
2376 pmcraid_ioa_reset(cmd);
2377 }
2378}
2379
2380/**
2381 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2382 * or bringdown IOA
2383 * @pinstance: pointer adapter instance structure
2384 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2385 * @target_state: expected target state after reset
2386 *
2387 * Note: This command initiates reset and waits for its completion. Hence this
2388 * should not be called from isr/timer/tasklet functions (timeout handlers,
2389 * error response handlers and interrupt handlers).
2390 *
2391 * Return Value
2392 * 1 in case ioa_state is not target_state, 0 otherwise.
2393 */
2394static int pmcraid_reset_reload(
2395 struct pmcraid_instance *pinstance,
2396 u8 shutdown_type,
2397 u8 target_state
2398)
2399{
2400 struct pmcraid_cmd *reset_cmd = NULL;
2401 unsigned long lock_flags;
2402 int reset = 1;
2403
2404 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2405
2406 if (pinstance->ioa_reset_in_progress) {
2407 pmcraid_info("reset_reload: reset is already in progress\n");
2408
2409 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2410
2411 wait_event(pinstance->reset_wait_q,
2412 !pinstance->ioa_reset_in_progress);
2413
2414 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2415
2416 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2417 spin_unlock_irqrestore(pinstance->host->host_lock,
2418 lock_flags);
2419 pmcraid_info("reset_reload: IOA is dead\n");
2420 return reset;
2421 } else if (pinstance->ioa_state == target_state) {
2422 reset = 0;
2423 }
2424 }
2425
2426 if (reset) {
2427 pmcraid_info("reset_reload: proceeding with reset\n");
2428 scsi_block_requests(pinstance->host);
2429 reset_cmd = pmcraid_get_free_cmd(pinstance);
2430
2431 if (reset_cmd == NULL) {
2432 pmcraid_err("no free cmnd for reset_reload\n");
2433 spin_unlock_irqrestore(pinstance->host->host_lock,
2434 lock_flags);
2435 return reset;
2436 }
2437
2438 if (shutdown_type == SHUTDOWN_NORMAL)
2439 pinstance->ioa_bringdown = 1;
2440
2441 pinstance->ioa_shutdown_type = shutdown_type;
2442 pinstance->reset_cmd = reset_cmd;
2443 pinstance->force_ioa_reset = reset;
2444 pmcraid_info("reset_reload: initiating reset\n");
2445 pmcraid_ioa_reset(reset_cmd);
2446 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2447 pmcraid_info("reset_reload: waiting for reset to complete\n");
2448 wait_event(pinstance->reset_wait_q,
2449 !pinstance->ioa_reset_in_progress);
2450
2451 pmcraid_info("reset_reload: reset is complete !!\n");
2452 scsi_unblock_requests(pinstance->host);
2453 if (pinstance->ioa_state == target_state)
2454 reset = 0;
2455 }
2456
2457 return reset;
2458}
2459
2460/**
2461 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2462 *
2463 * @pinstance: pointer to adapter instance structure
2464 *
2465 * Return Value
2466 * whatever is returned from pmcraid_reset_reload
2467 */
2468static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2469{
2470 return pmcraid_reset_reload(pinstance,
2471 SHUTDOWN_NORMAL,
2472 IOA_STATE_UNKNOWN);
2473}
2474
2475/**
2476 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2477 *
2478 * @pinstance: pointer to adapter instance structure
2479 *
2480 * Return Value
2481 * whatever is returned from pmcraid_reset_reload
2482 */
2483static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2484{
2485 pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2486
2487 return pmcraid_reset_reload(pinstance,
2488 SHUTDOWN_NONE,
2489 IOA_STATE_OPERATIONAL);
2490}
2491
2492/**
2493 * pmcraid_request_sense - Send request sense to a device
2494 * @cmd: pmcraid command struct
2495 *
2496 * This function sends a request sense to a device as a result of a check
2497 * condition. This method re-uses the same command block that failed earlier.
2498 */
2499static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2500{
2501 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2502 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2503
2504 /* allocate DMAable memory for sense buffers */
2505 cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
2506 SCSI_SENSE_BUFFERSIZE,
2507 &cmd->sense_buffer_dma);
2508
2509 if (cmd->sense_buffer == NULL) {
2510 pmcraid_err
2511 ("couldn't allocate sense buffer for request sense\n");
2512 pmcraid_erp_done(cmd);
2513 return;
2514 }
2515
2516 /* re-use the command block */
2517 memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2518 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2519 ioarcb->request_flags0 = (SYNC_COMPLETE |
2520 NO_LINK_DESCS |
2521 INHIBIT_UL_CHECK);
2522 ioarcb->request_type = REQ_TYPE_SCSI;
2523 ioarcb->cdb[0] = REQUEST_SENSE;
2524 ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2525
2526 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2527 offsetof(struct pmcraid_ioarcb,
2528 add_data.u.ioadl[0]));
2529 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2530
2531 ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2532
2533 ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2534 ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2535 ioadl->flags = IOADL_FLAGS_LAST_DESC;
2536
2537 /* request sense might be called as part of error response processing
2538 * which runs in tasklets context. It is possible that mid-layer might
2539 * schedule queuecommand during this time, hence, writting to IOARRIN
2540 * must be protect by host_lock
2541 */
2542 pmcraid_send_cmd(cmd, pmcraid_erp_done,
2543 PMCRAID_REQUEST_SENSE_TIMEOUT,
2544 pmcraid_timeout_handler);
2545}
2546
2547/**
2548 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2549 * @cmd: command that failed
2550 * @sense: true if request_sense is required after cancel all
2551 *
2552 * This function sends a cancel all to a device to clear the queue.
2553 */
2554static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
2555{
2556 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2557 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2558 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2559 void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
2560 : pmcraid_request_sense;
2561
2562 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2563 ioarcb->request_flags0 = SYNC_OVERRIDE;
2564 ioarcb->request_type = REQ_TYPE_IOACMD;
2565 ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2566
2567 if (RES_IS_GSCSI(res->cfg_entry))
2568 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2569
2570 ioarcb->ioadl_bus_addr = 0;
2571 ioarcb->ioadl_length = 0;
2572 ioarcb->data_transfer_length = 0;
2573 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
2574
2575 /* writing to IOARRIN must be protected by host_lock, as mid-layer
2576 * schedule queuecommand while we are doing this
2577 */
2578 pmcraid_send_cmd(cmd, cmd_done,
2579 PMCRAID_REQUEST_SENSE_TIMEOUT,
2580 pmcraid_timeout_handler);
2581}
2582
2583/**
2584 * pmcraid_frame_auto_sense: frame fixed format sense information
2585 *
2586 * @cmd: pointer to failing command block
2587 *
2588 * Return value
2589 * none
2590 */
2591static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2592{
2593 u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2594 struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2595 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2596 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2597 u32 failing_lba = 0;
2598
2599 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2600 cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2601
2602 if (RES_IS_VSET(res->cfg_entry) &&
2603 ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2604 ioasa->u.vset.failing_lba_hi != 0) {
2605
2606 sense_buf[0] = 0x72;
2607 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2608 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2609 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2610
2611 sense_buf[7] = 12;
2612 sense_buf[8] = 0;
2613 sense_buf[9] = 0x0A;
2614 sense_buf[10] = 0x80;
2615
2616 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2617
2618 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2619 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2620 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2621 sense_buf[15] = failing_lba & 0x000000ff;
2622
2623 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2624
2625 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2626 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2627 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2628 sense_buf[19] = failing_lba & 0x000000ff;
2629 } else {
2630 sense_buf[0] = 0x70;
2631 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2632 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2633 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2634
2635 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2636 if (RES_IS_VSET(res->cfg_entry))
2637 failing_lba =
2638 le32_to_cpu(ioasa->u.
2639 vset.failing_lba_lo);
2640 sense_buf[0] |= 0x80;
2641 sense_buf[3] = (failing_lba >> 24) & 0xff;
2642 sense_buf[4] = (failing_lba >> 16) & 0xff;
2643 sense_buf[5] = (failing_lba >> 8) & 0xff;
2644 sense_buf[6] = failing_lba & 0xff;
2645 }
2646
2647 sense_buf[7] = 6; /* additional length */
2648 }
2649}
2650
2651/**
2652 * pmcraid_error_handler - Error response handlers for a SCSI op
2653 * @cmd: pointer to pmcraid_cmd that has failed
2654 *
2655 * This function determines whether or not to initiate ERP on the affected
2656 * device. This is called from a tasklet, which doesn't hold any locks.
2657 *
2658 * Return value:
2659 * 0 it caller can complete the request, otherwise 1 where in error
2660 * handler itself completes the request and returns the command block
2661 * back to free-pool
2662 */
2663static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2664{
2665 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2666 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2667 struct pmcraid_instance *pinstance = cmd->drv_inst;
2668 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2669 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2670 u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2671 u32 sense_copied = 0;
2672
2673 if (!res) {
2674 pmcraid_info("resource pointer is NULL\n");
2675 return 0;
2676 }
2677
2678 /* If this was a SCSI read/write command keep count of errors */
2679 if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2680 atomic_inc(&res->read_failures);
2681 else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2682 atomic_inc(&res->write_failures);
2683
2684 if (!RES_IS_GSCSI(res->cfg_entry) &&
2685 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2686 pmcraid_frame_auto_sense(cmd);
2687 }
2688
2689 /* Log IOASC/IOASA information based on user settings */
2690 pmcraid_ioasc_logger(ioasc, cmd);
2691
2692 switch (masked_ioasc) {
2693
2694 case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2695 scsi_cmd->result |= (DID_ABORT << 16);
2696 break;
2697
2698 case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2699 case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2700 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2701 break;
2702
2703 case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2704 res->sync_reqd = 1;
2705 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2706 break;
2707
2708 case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2709 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2710 break;
2711
2712 case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2713 case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2714 if (!res->reset_progress)
2715 scsi_report_bus_reset(pinstance->host,
2716 scsi_cmd->device->channel);
2717 scsi_cmd->result |= (DID_ERROR << 16);
2718 break;
2719
2720 case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2721 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2722 res->sync_reqd = 1;
2723
2724 /* if check_condition is not active return with error otherwise
2725 * get/frame the sense buffer
2726 */
2727 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2728 SAM_STAT_CHECK_CONDITION &&
2729 PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2730 return 0;
2731
2732 /* If we have auto sense data as part of IOASA pass it to
2733 * mid-layer
2734 */
2735 if (ioasa->auto_sense_length != 0) {
2736 short sense_len = ioasa->auto_sense_length;
2737 int data_size = min_t(u16, le16_to_cpu(sense_len),
2738 SCSI_SENSE_BUFFERSIZE);
2739
2740 memcpy(scsi_cmd->sense_buffer,
2741 ioasa->sense_data,
2742 data_size);
2743 sense_copied = 1;
2744 }
2745
2746 if (RES_IS_GSCSI(res->cfg_entry))
2747 pmcraid_cancel_all(cmd, sense_copied);
2748 else if (sense_copied)
2749 pmcraid_erp_done(cmd);
2750 else
2751 pmcraid_request_sense(cmd);
2752
2753 return 1;
2754
2755 case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2756 break;
2757
2758 default:
2759 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2760 scsi_cmd->result |= (DID_ERROR << 16);
2761 break;
2762 }
2763 return 0;
2764}
2765
2766/**
2767 * pmcraid_reset_device - device reset handler functions
2768 *
2769 * @scsi_cmd: scsi command struct
2770 * @modifier: reset modifier indicating the reset sequence to be performed
2771 *
2772 * This function issues a device reset to the affected device.
2773 * A LUN reset will be sent to the device first. If that does
2774 * not work, a target reset will be sent.
2775 *
2776 * Return value:
2777 * SUCCESS / FAILED
2778 */
2779static int pmcraid_reset_device(
2780 struct scsi_cmnd *scsi_cmd,
2781 unsigned long timeout,
2782 u8 modifier
2783)
2784{
2785 struct pmcraid_cmd *cmd;
2786 struct pmcraid_instance *pinstance;
2787 struct pmcraid_resource_entry *res;
2788 struct pmcraid_ioarcb *ioarcb;
2789 unsigned long lock_flags;
2790 u32 ioasc;
2791
2792 pinstance =
2793 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2794 res = scsi_cmd->device->hostdata;
2795
2796 if (!res) {
2797 sdev_printk(KERN_ERR, scsi_cmd->device,
2798 "reset_device: NULL resource pointer\n");
2799 return FAILED;
2800 }
2801
2802 /* If adapter is currently going through reset/reload, return failed.
2803 * This will force the mid-layer to call _eh_bus/host reset, which
2804 * will then go to sleep and wait for the reset to complete
2805 */
2806 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2807 if (pinstance->ioa_reset_in_progress ||
2808 pinstance->ioa_state == IOA_STATE_DEAD) {
2809 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2810 return FAILED;
2811 }
2812
2813 res->reset_progress = 1;
2814 pmcraid_info("Resetting %s resource with addr %x\n",
2815 ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2816 ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2817 le32_to_cpu(res->cfg_entry.resource_address));
2818
2819 /* get a free cmd block */
2820 cmd = pmcraid_get_free_cmd(pinstance);
2821
2822 if (cmd == NULL) {
2823 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2824 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2825 return FAILED;
2826 }
2827
2828 ioarcb = &cmd->ioa_cb->ioarcb;
2829 ioarcb->resource_handle = res->cfg_entry.resource_handle;
2830 ioarcb->request_type = REQ_TYPE_IOACMD;
2831 ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2832
2833 /* Initialize reset modifier bits */
2834 if (modifier)
2835 modifier = ENABLE_RESET_MODIFIER | modifier;
2836
2837 ioarcb->cdb[1] = modifier;
2838
2839 init_completion(&cmd->wait_for_completion);
2840 cmd->completion_req = 1;
2841
2842 pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2843 cmd->ioa_cb->ioarcb.cdb[0],
2844 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2845 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2846
2847 pmcraid_send_cmd(cmd,
2848 pmcraid_internal_done,
2849 timeout,
2850 pmcraid_timeout_handler);
2851
2852 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2853
2854 /* RESET_DEVICE command completes after all pending IOARCBs are
2855 * completed. Once this command is completed, pmcraind_internal_done
2856 * will wake up the 'completion' queue.
2857 */
2858 wait_for_completion(&cmd->wait_for_completion);
2859
2860 /* complete the command here itself and return the command block
2861 * to free list
2862 */
2863 pmcraid_return_cmd(cmd);
2864 res->reset_progress = 0;
2865 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2866
2867 /* set the return value based on the returned ioasc */
2868 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2869}
2870
2871/**
2872 * _pmcraid_io_done - helper for pmcraid_io_done function
2873 *
2874 * @cmd: pointer to pmcraid command struct
2875 * @reslen: residual data length to be set in the ioasa
2876 * @ioasc: ioasc either returned by IOA or set by driver itself.
2877 *
2878 * This function is invoked by pmcraid_io_done to complete mid-layer
2879 * scsi ops.
2880 *
2881 * Return value:
2882 * 0 if caller is required to return it to free_pool. Returns 1 if
2883 * caller need not worry about freeing command block as error handler
2884 * will take care of that.
2885 */
2886
2887static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2888{
2889 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2890 int rc = 0;
2891
2892 scsi_set_resid(scsi_cmd, reslen);
2893
2894 pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2895 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2896 cmd->ioa_cb->ioarcb.cdb[0],
2897 ioasc, scsi_cmd->result);
2898
2899 if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2900 rc = pmcraid_error_handler(cmd);
2901
2902 if (rc == 0) {
2903 scsi_dma_unmap(scsi_cmd);
2904 scsi_cmd->scsi_done(scsi_cmd);
2905 }
2906
2907 return rc;
2908}
2909
2910/**
2911 * pmcraid_io_done - SCSI completion function
2912 *
2913 * @cmd: pointer to pmcraid command struct
2914 *
2915 * This function is invoked by tasklet/mid-layer error handler to completing
2916 * the SCSI ops sent from mid-layer.
2917 *
2918 * Return value
2919 * none
2920 */
2921
2922static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2923{
2924 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2925 u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2926
2927 if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2928 pmcraid_return_cmd(cmd);
2929}
2930
2931/**
2932 * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2933 *
2934 * @cmd: command block of the command to be aborted
2935 *
2936 * Return Value:
2937 * returns pointer to command structure used as cancelling cmd
2938 */
2939static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2940{
2941 struct pmcraid_cmd *cancel_cmd;
2942 struct pmcraid_instance *pinstance;
2943 struct pmcraid_resource_entry *res;
2944
2945 pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2946 res = cmd->scsi_cmd->device->hostdata;
2947
2948 cancel_cmd = pmcraid_get_free_cmd(pinstance);
2949
2950 if (cancel_cmd == NULL) {
2951 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2952 return NULL;
2953 }
2954
2955 pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2956
2957 pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2958 cmd->ioa_cb->ioarcb.cdb[0],
2959 cmd->ioa_cb->ioarcb.response_handle >> 2);
2960
2961 init_completion(&cancel_cmd->wait_for_completion);
2962 cancel_cmd->completion_req = 1;
2963
2964 pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2965 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2966 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2967 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2968
2969 pmcraid_send_cmd(cancel_cmd,
2970 pmcraid_internal_done,
2971 PMCRAID_INTERNAL_TIMEOUT,
2972 pmcraid_timeout_handler);
2973 return cancel_cmd;
2974}
2975
2976/**
2977 * pmcraid_abort_complete - Waits for ABORT TASK completion
2978 *
2979 * @cancel_cmd: command block use as cancelling command
2980 *
2981 * Return Value:
2982 * returns SUCCESS if ABORT TASK has good completion
2983 * otherwise FAILED
2984 */
2985static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2986{
2987 struct pmcraid_resource_entry *res;
2988 u32 ioasc;
2989
2990 wait_for_completion(&cancel_cmd->wait_for_completion);
2991 res = cancel_cmd->res;
2992 cancel_cmd->res = NULL;
2993 ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2994
2995 /* If the abort task is not timed out we will get a Good completion
2996 * as sense_key, otherwise we may get one the following responses
2997 * due to subsequent bus reset or device reset. In case IOASC is
2998 * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2999 */
3000 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
3001 ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
3002 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
3003 res->sync_reqd = 1;
3004 ioasc = 0;
3005 }
3006
3007 /* complete the command here itself */
3008 pmcraid_return_cmd(cancel_cmd);
3009 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
3010}
3011
3012/**
3013 * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
3014 *
3015 * @scsi_cmd: scsi command struct given by mid-layer. When this is called
3016 * mid-layer ensures that no other commands are queued. This
3017 * never gets called under interrupt, but a separate eh thread.
3018 *
3019 * Return value:
3020 * SUCCESS / FAILED
3021 */
3022static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
3023{
3024 struct pmcraid_instance *pinstance;
3025 struct pmcraid_cmd *cmd;
3026 struct pmcraid_resource_entry *res;
3027 unsigned long host_lock_flags;
3028 unsigned long pending_lock_flags;
3029 struct pmcraid_cmd *cancel_cmd = NULL;
3030 int cmd_found = 0;
3031 int rc = FAILED;
3032
3033 pinstance =
3034 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3035
3036 scmd_printk(KERN_INFO, scsi_cmd,
3037 "I/O command timed out, aborting it.\n");
3038
3039 res = scsi_cmd->device->hostdata;
3040
3041 if (res == NULL)
3042 return rc;
3043
3044 /* If we are currently going through reset/reload, return failed.
3045 * This will force the mid-layer to eventually call
3046 * pmcraid_eh_host_reset which will then go to sleep and wait for the
3047 * reset to complete
3048 */
3049 spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
3050
3051 if (pinstance->ioa_reset_in_progress ||
3052 pinstance->ioa_state == IOA_STATE_DEAD) {
3053 spin_unlock_irqrestore(pinstance->host->host_lock,
3054 host_lock_flags);
3055 return rc;
3056 }
3057
3058 /* loop over pending cmd list to find cmd corresponding to this
3059 * scsi_cmd. Note that this command might not have been completed
3060 * already. locking: all pending commands are protected with
3061 * pending_pool_lock.
3062 */
3063 spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
3064 list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
3065
3066 if (cmd->scsi_cmd == scsi_cmd) {
3067 cmd_found = 1;
3068 break;
3069 }
3070 }
3071
3072 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3073 pending_lock_flags);
3074
3075 /* If the command to be aborted was given to IOA and still pending with
3076 * it, send ABORT_TASK to abort this and wait for its completion
3077 */
3078 if (cmd_found)
3079 cancel_cmd = pmcraid_abort_cmd(cmd);
3080
3081 spin_unlock_irqrestore(pinstance->host->host_lock,
3082 host_lock_flags);
3083
3084 if (cancel_cmd) {
3085 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3086 rc = pmcraid_abort_complete(cancel_cmd);
3087 }
3088
3089 return cmd_found ? rc : SUCCESS;
3090}
3091
3092/**
3093 * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
3094 *
3095 * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3096 *
3097 * All these routines invokve pmcraid_reset_device with appropriate parameters.
3098 * Since these are called from mid-layer EH thread, no other IO will be queued
3099 * to the resource being reset. However, control path (IOCTL) may be active so
3100 * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3101 * takes care by locking/unlocking host_lock.
3102 *
3103 * Return value
3104 * SUCCESS or FAILED
3105 */
3106static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3107{
3108 scmd_printk(KERN_INFO, scmd,
3109 "resetting device due to an I/O command timeout.\n");
3110 return pmcraid_reset_device(scmd,
3111 PMCRAID_INTERNAL_TIMEOUT,
3112 RESET_DEVICE_LUN);
3113}
3114
3115static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3116{
3117 scmd_printk(KERN_INFO, scmd,
3118 "Doing bus reset due to an I/O command timeout.\n");
3119 return pmcraid_reset_device(scmd,
3120 PMCRAID_RESET_BUS_TIMEOUT,
3121 RESET_DEVICE_BUS);
3122}
3123
3124static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3125{
3126 scmd_printk(KERN_INFO, scmd,
3127 "Doing target reset due to an I/O command timeout.\n");
3128 return pmcraid_reset_device(scmd,
3129 PMCRAID_INTERNAL_TIMEOUT,
3130 RESET_DEVICE_TARGET);
3131}
3132
3133/**
3134 * pmcraid_eh_host_reset_handler - adapter reset handler callback
3135 *
3136 * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3137 *
3138 * Initiates adapter reset to bring it up to operational state
3139 *
3140 * Return value
3141 * SUCCESS or FAILED
3142 */
3143static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3144{
3145 unsigned long interval = 10000; /* 10 seconds interval */
3146 int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3147 struct pmcraid_instance *pinstance =
3148 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3149
3150
3151 /* wait for an additional 150 seconds just in case firmware could come
3152 * up and if it could complete all the pending commands excluding the
3153 * two HCAM (CCN and LDN).
3154 */
3155 while (waits--) {
3156 if (atomic_read(&pinstance->outstanding_cmds) <=
3157 PMCRAID_MAX_HCAM_CMD)
3158 return SUCCESS;
3159 msleep(interval);
3160 }
3161
3162 dev_err(&pinstance->pdev->dev,
3163 "Adapter being reset due to an I/O command timeout.\n");
3164 return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3165}
3166
3167/**
3168 * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
3169 * @scsi_cmd: scsi command struct
3170 *
3171 * Return value
3172 * number of tags or 0 if the task is not tagged
3173 */
3174static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
3175{
3176 char tag[2];
3177 u8 rc = 0;
3178
3179 if (scsi_populate_tag_msg(scsi_cmd, tag)) {
3180 switch (tag[0]) {
3181 case MSG_SIMPLE_TAG:
3182 rc = TASK_TAG_SIMPLE;
3183 break;
3184 case MSG_HEAD_TAG:
3185 rc = TASK_TAG_QUEUE_HEAD;
3186 break;
3187 case MSG_ORDERED_TAG:
3188 rc = TASK_TAG_ORDERED;
3189 break;
3190 };
3191 }
3192
3193 return rc;
3194}
3195
3196
3197/**
3198 * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3199 * @cmd: pmcraid command struct
3200 * @sgcount: count of scatter-gather elements
3201 *
3202 * Return value
3203 * returns pointer pmcraid_ioadl_desc, initialized to point to internal
3204 * or external IOADLs
3205 */
3206struct pmcraid_ioadl_desc *
3207pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3208{
3209 struct pmcraid_ioadl_desc *ioadl;
3210 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3211 int ioadl_count = 0;
3212
3213 if (ioarcb->add_cmd_param_length)
3214 ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
3215 ioarcb->ioadl_length =
3216 sizeof(struct pmcraid_ioadl_desc) * sgcount;
3217
3218 if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3219 /* external ioadls start at offset 0x80 from control_block
3220 * structure, re-using 24 out of 27 ioadls part of IOARCB.
3221 * It is necessary to indicate to firmware that driver is
3222 * using ioadls to be treated as external to IOARCB.
3223 */
3224 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
3225 ioarcb->ioadl_bus_addr =
3226 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3227 offsetof(struct pmcraid_ioarcb,
3228 add_data.u.ioadl[3]));
3229 ioadl = &ioarcb->add_data.u.ioadl[3];
3230 } else {
3231 ioarcb->ioadl_bus_addr =
3232 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3233 offsetof(struct pmcraid_ioarcb,
3234 add_data.u.ioadl[ioadl_count]));
3235
3236 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3237 ioarcb->ioarcb_bus_addr |=
3238 DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
3239 }
3240
3241 return ioadl;
3242}
3243
3244/**
3245 * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3246 * @pinstance: pointer to adapter instance structure
3247 * @cmd: pmcraid command struct
3248 *
3249 * This function is invoked by queuecommand entry point while sending a command
3250 * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3251 *
3252 * Return value:
3253 * 0 on success or -1 on failure
3254 */
3255static int pmcraid_build_ioadl(
3256 struct pmcraid_instance *pinstance,
3257 struct pmcraid_cmd *cmd
3258)
3259{
3260 int i, nseg;
3261 struct scatterlist *sglist;
3262
3263 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3264 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3265 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
3266
3267 u32 length = scsi_bufflen(scsi_cmd);
3268
3269 if (!length)
3270 return 0;
3271
3272 nseg = scsi_dma_map(scsi_cmd);
3273
3274 if (nseg < 0) {
3275 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3276 return -1;
3277 } else if (nseg > PMCRAID_MAX_IOADLS) {
3278 scsi_dma_unmap(scsi_cmd);
3279 scmd_printk(KERN_ERR, scsi_cmd,
3280 "sg count is (%d) more than allowed!\n", nseg);
3281 return -1;
3282 }
3283
3284 /* Initialize IOARCB data transfer length fields */
3285 if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3286 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3287
3288 ioarcb->request_flags0 |= NO_LINK_DESCS;
3289 ioarcb->data_transfer_length = cpu_to_le32(length);
3290 ioadl = pmcraid_init_ioadls(cmd, nseg);
3291
3292 /* Initialize IOADL descriptor addresses */
3293 scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3294 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3295 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3296 ioadl[i].flags = 0;
3297 }
3298 /* setup last descriptor */
3299 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3300
3301 return 0;
3302}
3303
3304/**
3305 * pmcraid_free_sglist - Frees an allocated SG buffer list
3306 * @sglist: scatter/gather list pointer
3307 *
3308 * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3309 *
3310 * Return value:
3311 * none
3312 */
3313static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3314{
3315 int i;
3316
3317 for (i = 0; i < sglist->num_sg; i++)
3318 __free_pages(sg_page(&(sglist->scatterlist[i])),
3319 sglist->order);
3320
3321 kfree(sglist);
3322}
3323
3324/**
3325 * pmcraid_alloc_sglist - Allocates memory for a SG list
3326 * @buflen: buffer length
3327 *
3328 * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3329 * list.
3330 *
3331 * Return value
3332 * pointer to sglist / NULL on failure
3333 */
3334static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3335{
3336 struct pmcraid_sglist *sglist;
3337 struct scatterlist *scatterlist;
3338 struct page *page;
3339 int num_elem, i, j;
3340 int sg_size;
3341 int order;
3342 int bsize_elem;
3343
3344 sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3345 order = (sg_size > 0) ? get_order(sg_size) : 0;
3346 bsize_elem = PAGE_SIZE * (1 << order);
3347
3348 /* Determine the actual number of sg entries needed */
3349 if (buflen % bsize_elem)
3350 num_elem = (buflen / bsize_elem) + 1;
3351 else
3352 num_elem = buflen / bsize_elem;
3353
3354 /* Allocate a scatter/gather list for the DMA */
3355 sglist = kzalloc(sizeof(struct pmcraid_sglist) +
3356 (sizeof(struct scatterlist) * (num_elem - 1)),
3357 GFP_KERNEL);
3358
3359 if (sglist == NULL)
3360 return NULL;
3361
3362 scatterlist = sglist->scatterlist;
3363 sg_init_table(scatterlist, num_elem);
3364 sglist->order = order;
3365 sglist->num_sg = num_elem;
3366 sg_size = buflen;
3367
3368 for (i = 0; i < num_elem; i++) {
3369 page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
3370 if (!page) {
3371 for (j = i - 1; j >= 0; j--)
3372 __free_pages(sg_page(&scatterlist[j]), order);
3373 kfree(sglist);
3374 return NULL;
3375 }
3376
3377 sg_set_page(&scatterlist[i], page,
3378 sg_size < bsize_elem ? sg_size : bsize_elem, 0);
3379 sg_size -= bsize_elem;
3380 }
3381
3382 return sglist;
3383}
3384
3385/**
3386 * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3387 * @sglist: scatter/gather list pointer
3388 * @buffer: buffer pointer
3389 * @len: buffer length
3390 * @direction: data transfer direction
3391 *
3392 * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3393 *
3394 * Return value:
3395 * 0 on success / other on failure
3396 */
3397static int pmcraid_copy_sglist(
3398 struct pmcraid_sglist *sglist,
3399 unsigned long buffer,
3400 u32 len,
3401 int direction
3402)
3403{
3404 struct scatterlist *scatterlist;
3405 void *kaddr;
3406 int bsize_elem;
3407 int i;
3408 int rc = 0;
3409
3410 /* Determine the actual number of bytes per element */
3411 bsize_elem = PAGE_SIZE * (1 << sglist->order);
3412
3413 scatterlist = sglist->scatterlist;
3414
3415 for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
3416 struct page *page = sg_page(&scatterlist[i]);
3417
3418 kaddr = kmap(page);
3419 if (direction == DMA_TO_DEVICE)
3420 rc = __copy_from_user(kaddr,
3421 (void *)buffer,
3422 bsize_elem);
3423 else
3424 rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
3425
3426 kunmap(page);
3427
3428 if (rc) {
3429 pmcraid_err("failed to copy user data into sg list\n");
3430 return -EFAULT;
3431 }
3432
3433 scatterlist[i].length = bsize_elem;
3434 }
3435
3436 if (len % bsize_elem) {
3437 struct page *page = sg_page(&scatterlist[i]);
3438
3439 kaddr = kmap(page);
3440
3441 if (direction == DMA_TO_DEVICE)
3442 rc = __copy_from_user(kaddr,
3443 (void *)buffer,
3444 len % bsize_elem);
3445 else
3446 rc = __copy_to_user((void *)buffer,
3447 kaddr,
3448 len % bsize_elem);
3449
3450 kunmap(page);
3451
3452 scatterlist[i].length = len % bsize_elem;
3453 }
3454
3455 if (rc) {
3456 pmcraid_err("failed to copy user data into sg list\n");
3457 rc = -EFAULT;
3458 }
3459
3460 return rc;
3461}
3462
3463/**
3464 * pmcraid_queuecommand - Queue a mid-layer request
3465 * @scsi_cmd: scsi command struct
3466 * @done: done function
3467 *
3468 * This function queues a request generated by the mid-layer. Midlayer calls
3469 * this routine within host->lock. Some of the functions called by queuecommand
3470 * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3471 *
3472 * Return value:
3473 * 0 on success
3474 * SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3475 * SCSI_MLQUEUE_HOST_BUSY if host is busy
3476 */
3477static int pmcraid_queuecommand_lck(
3478 struct scsi_cmnd *scsi_cmd,
3479 void (*done) (struct scsi_cmnd *)
3480)
3481{
3482 struct pmcraid_instance *pinstance;
3483 struct pmcraid_resource_entry *res;
3484 struct pmcraid_ioarcb *ioarcb;
3485 struct pmcraid_cmd *cmd;
3486 u32 fw_version;
3487 int rc = 0;
3488
3489 pinstance =
3490 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3491 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3492 scsi_cmd->scsi_done = done;
3493 res = scsi_cmd->device->hostdata;
3494 scsi_cmd->result = (DID_OK << 16);
3495
3496 /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3497 * the command
3498 */
3499 if (pinstance->ioa_state == IOA_STATE_DEAD) {
3500 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3501 scsi_cmd->result = (DID_NO_CONNECT << 16);
3502 scsi_cmd->scsi_done(scsi_cmd);
3503 return 0;
3504 }
3505
3506 /* If IOA reset is in progress, can't queue the commands */
3507 if (pinstance->ioa_reset_in_progress)
3508 return SCSI_MLQUEUE_HOST_BUSY;
3509
3510 /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3511 * the command here itself with success return
3512 */
3513 if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3514 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3515 scsi_cmd->scsi_done(scsi_cmd);
3516 return 0;
3517 }
3518
3519 /* initialize the command and IOARCB to be sent to IOA */
3520 cmd = pmcraid_get_free_cmd(pinstance);
3521
3522 if (cmd == NULL) {
3523 pmcraid_err("free command block is not available\n");
3524 return SCSI_MLQUEUE_HOST_BUSY;
3525 }
3526
3527 cmd->scsi_cmd = scsi_cmd;
3528 ioarcb = &(cmd->ioa_cb->ioarcb);
3529 memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3530 ioarcb->resource_handle = res->cfg_entry.resource_handle;
3531 ioarcb->request_type = REQ_TYPE_SCSI;
3532
3533 /* set hrrq number where the IOA should respond to. Note that all cmds
3534 * generated internally uses hrrq_id 0, exception to this is the cmd
3535 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3536 * hrrq_id assigned here in queuecommand
3537 */
3538 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3539 pinstance->num_hrrq;
3540 cmd->cmd_done = pmcraid_io_done;
3541
3542 if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3543 if (scsi_cmd->underflow == 0)
3544 ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3545
3546 if (res->sync_reqd) {
3547 ioarcb->request_flags0 |= SYNC_COMPLETE;
3548 res->sync_reqd = 0;
3549 }
3550
3551 ioarcb->request_flags0 |= NO_LINK_DESCS;
3552 ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);
3553
3554 if (RES_IS_GSCSI(res->cfg_entry))
3555 ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3556 }
3557
3558 rc = pmcraid_build_ioadl(pinstance, cmd);
3559
3560 pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3561 le32_to_cpu(ioarcb->response_handle) >> 2,
3562 scsi_cmd->cmnd[0], pinstance->host->unique_id,
3563 RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3564 PMCRAID_PHYS_BUS_ID,
3565 RES_IS_VSET(res->cfg_entry) ?
3566 (fw_version <= PMCRAID_FW_VERSION_1 ?
3567 res->cfg_entry.unique_flags1 :
3568 res->cfg_entry.array_id & 0xFF) :
3569 RES_TARGET(res->cfg_entry.resource_address),
3570 RES_LUN(res->cfg_entry.resource_address));
3571
3572 if (likely(rc == 0)) {
3573 _pmcraid_fire_command(cmd);
3574 } else {
3575 pmcraid_err("queuecommand could not build ioadl\n");
3576 pmcraid_return_cmd(cmd);
3577 rc = SCSI_MLQUEUE_HOST_BUSY;
3578 }
3579
3580 return rc;
3581}
3582
3583static DEF_SCSI_QCMD(pmcraid_queuecommand)
3584
3585/**
3586 * pmcraid_open -char node "open" entry, allowed only users with admin access
3587 */
3588static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3589{
3590 struct pmcraid_instance *pinstance;
3591
3592 if (!capable(CAP_SYS_ADMIN))
3593 return -EACCES;
3594
3595 /* Populate adapter instance * pointer for use by ioctl */
3596 pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3597 filep->private_data = pinstance;
3598
3599 return 0;
3600}
3601
3602/**
3603 * pmcraid_release - char node "release" entry point
3604 */
3605static int pmcraid_chr_release(struct inode *inode, struct file *filep)
3606{
3607 struct pmcraid_instance *pinstance = filep->private_data;
3608
3609 filep->private_data = NULL;
3610 fasync_helper(-1, filep, 0, &pinstance->aen_queue);
3611
3612 return 0;
3613}
3614
3615/**
3616 * pmcraid_fasync - Async notifier registration from applications
3617 *
3618 * This function adds the calling process to a driver global queue. When an
3619 * event occurs, SIGIO will be sent to all processes in this queue.
3620 */
3621static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3622{
3623 struct pmcraid_instance *pinstance;
3624 int rc;
3625
3626 pinstance = filep->private_data;
3627 mutex_lock(&pinstance->aen_queue_lock);
3628 rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3629 mutex_unlock(&pinstance->aen_queue_lock);
3630
3631 return rc;
3632}
3633
3634
3635/**
3636 * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3637 * commands sent over IOCTL interface
3638 *
3639 * @cmd : pointer to struct pmcraid_cmd
3640 * @buflen : length of the request buffer
3641 * @direction : data transfer direction
3642 *
3643 * Return value
3644 * 0 on success, non-zero error code on failure
3645 */
3646static int pmcraid_build_passthrough_ioadls(
3647 struct pmcraid_cmd *cmd,
3648 int buflen,
3649 int direction
3650)
3651{
3652 struct pmcraid_sglist *sglist = NULL;
3653 struct scatterlist *sg = NULL;
3654 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3655 struct pmcraid_ioadl_desc *ioadl;
3656 int i;
3657
3658 sglist = pmcraid_alloc_sglist(buflen);
3659
3660 if (!sglist) {
3661 pmcraid_err("can't allocate memory for passthrough SGls\n");
3662 return -ENOMEM;
3663 }
3664
3665 sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
3666 sglist->scatterlist,
3667 sglist->num_sg, direction);
3668
3669 if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3670 dev_err(&cmd->drv_inst->pdev->dev,
3671 "Failed to map passthrough buffer!\n");
3672 pmcraid_free_sglist(sglist);
3673 return -EIO;
3674 }
3675
3676 cmd->sglist = sglist;
3677 ioarcb->request_flags0 |= NO_LINK_DESCS;
3678
3679 ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3680
3681 /* Initialize IOADL descriptor addresses */
3682 for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3683 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3684 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3685 ioadl[i].flags = 0;
3686 }
3687
3688 /* setup the last descriptor */
3689 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3690
3691 return 0;
3692}
3693
3694
3695/**
3696 * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3697 *
3698 * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3699 * @buflen: size of the request buffer
3700 * @direction: data transfer direction
3701 *
3702 * Return value
3703 * 0 on success, non-zero error code on failure
3704 */
3705static void pmcraid_release_passthrough_ioadls(
3706 struct pmcraid_cmd *cmd,
3707 int buflen,
3708 int direction
3709)
3710{
3711 struct pmcraid_sglist *sglist = cmd->sglist;
3712
3713 if (buflen > 0) {
3714 pci_unmap_sg(cmd->drv_inst->pdev,
3715 sglist->scatterlist,
3716 sglist->num_sg,
3717 direction);
3718 pmcraid_free_sglist(sglist);
3719 cmd->sglist = NULL;
3720 }
3721}
3722
3723/**
3724 * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3725 *
3726 * @pinstance: pointer to adapter instance structure
3727 * @cmd: ioctl code
3728 * @arg: pointer to pmcraid_passthrough_buffer user buffer
3729 *
3730 * Return value
3731 * 0 on success, non-zero error code on failure
3732 */
3733static long pmcraid_ioctl_passthrough(
3734 struct pmcraid_instance *pinstance,
3735 unsigned int ioctl_cmd,
3736 unsigned int buflen,
3737 unsigned long arg
3738)
3739{
3740 struct pmcraid_passthrough_ioctl_buffer *buffer;
3741 struct pmcraid_ioarcb *ioarcb;
3742 struct pmcraid_cmd *cmd;
3743 struct pmcraid_cmd *cancel_cmd;
3744 unsigned long request_buffer;
3745 unsigned long request_offset;
3746 unsigned long lock_flags;
3747 void *ioasa;
3748 u32 ioasc;
3749 int request_size;
3750 int buffer_size;
3751 u8 access, direction;
3752 int rc = 0;
3753
3754 /* If IOA reset is in progress, wait 10 secs for reset to complete */
3755 if (pinstance->ioa_reset_in_progress) {
3756 rc = wait_event_interruptible_timeout(
3757 pinstance->reset_wait_q,
3758 !pinstance->ioa_reset_in_progress,
3759 msecs_to_jiffies(10000));
3760
3761 if (!rc)
3762 return -ETIMEDOUT;
3763 else if (rc < 0)
3764 return -ERESTARTSYS;
3765 }
3766
3767 /* If adapter is not in operational state, return error */
3768 if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3769 pmcraid_err("IOA is not operational\n");
3770 return -ENOTTY;
3771 }
3772
3773 buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3774 buffer = kmalloc(buffer_size, GFP_KERNEL);
3775
3776 if (!buffer) {
3777 pmcraid_err("no memory for passthrough buffer\n");
3778 return -ENOMEM;
3779 }
3780
3781 request_offset =
3782 offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3783
3784 request_buffer = arg + request_offset;
3785
3786 rc = __copy_from_user(buffer,
3787 (struct pmcraid_passthrough_ioctl_buffer *) arg,
3788 sizeof(struct pmcraid_passthrough_ioctl_buffer));
3789
3790 ioasa =
3791 (void *)(arg +
3792 offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
3793
3794 if (rc) {
3795 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3796 rc = -EFAULT;
3797 goto out_free_buffer;
3798 }
3799
3800 request_size = buffer->ioarcb.data_transfer_length;
3801
3802 if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3803 access = VERIFY_READ;
3804 direction = DMA_TO_DEVICE;
3805 } else {
3806 access = VERIFY_WRITE;
3807 direction = DMA_FROM_DEVICE;
3808 }
3809
3810 if (request_size > 0) {
3811 rc = access_ok(access, arg, request_offset + request_size);
3812
3813 if (!rc) {
3814 rc = -EFAULT;
3815 goto out_free_buffer;
3816 }
3817 } else if (request_size < 0) {
3818 rc = -EINVAL;
3819 goto out_free_buffer;
3820 }
3821
3822 /* check if we have any additional command parameters */
3823 if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
3824 rc = -EINVAL;
3825 goto out_free_buffer;
3826 }
3827
3828 cmd = pmcraid_get_free_cmd(pinstance);
3829
3830 if (!cmd) {
3831 pmcraid_err("free command block is not available\n");
3832 rc = -ENOMEM;
3833 goto out_free_buffer;
3834 }
3835
3836 cmd->scsi_cmd = NULL;
3837 ioarcb = &(cmd->ioa_cb->ioarcb);
3838
3839 /* Copy the user-provided IOARCB stuff field by field */
3840 ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3841 ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3842 ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3843 ioarcb->request_type = buffer->ioarcb.request_type;
3844 ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3845 ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3846 memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3847
3848 if (buffer->ioarcb.add_cmd_param_length) {
3849 ioarcb->add_cmd_param_length =
3850 buffer->ioarcb.add_cmd_param_length;
3851 ioarcb->add_cmd_param_offset =
3852 buffer->ioarcb.add_cmd_param_offset;
3853 memcpy(ioarcb->add_data.u.add_cmd_params,
3854 buffer->ioarcb.add_data.u.add_cmd_params,
3855 buffer->ioarcb.add_cmd_param_length);
3856 }
3857
3858 /* set hrrq number where the IOA should respond to. Note that all cmds
3859 * generated internally uses hrrq_id 0, exception to this is the cmd
3860 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3861 * hrrq_id assigned here in queuecommand
3862 */
3863 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3864 pinstance->num_hrrq;
3865
3866 if (request_size) {
3867 rc = pmcraid_build_passthrough_ioadls(cmd,
3868 request_size,
3869 direction);
3870 if (rc) {
3871 pmcraid_err("couldn't build passthrough ioadls\n");
3872 goto out_free_buffer;
3873 }
3874 } else if (request_size < 0) {
3875 rc = -EINVAL;
3876 goto out_free_buffer;
3877 }
3878
3879 /* If data is being written into the device, copy the data from user
3880 * buffers
3881 */
3882 if (direction == DMA_TO_DEVICE && request_size > 0) {
3883 rc = pmcraid_copy_sglist(cmd->sglist,
3884 request_buffer,
3885 request_size,
3886 direction);
3887 if (rc) {
3888 pmcraid_err("failed to copy user buffer\n");
3889 goto out_free_sglist;
3890 }
3891 }
3892
3893 /* passthrough ioctl is a blocking command so, put the user to sleep
3894 * until timeout. Note that a timeout value of 0 means, do timeout.
3895 */
3896 cmd->cmd_done = pmcraid_internal_done;
3897 init_completion(&cmd->wait_for_completion);
3898 cmd->completion_req = 1;
3899
3900 pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3901 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3902 cmd->ioa_cb->ioarcb.cdb[0],
3903 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3904
3905 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3906 _pmcraid_fire_command(cmd);
3907 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3908
3909 /* NOTE ! Remove the below line once abort_task is implemented
3910 * in firmware. This line disables ioctl command timeout handling logic
3911 * similar to IO command timeout handling, making ioctl commands to wait
3912 * until the command completion regardless of timeout value specified in
3913 * ioarcb
3914 */
3915 buffer->ioarcb.cmd_timeout = 0;
3916
3917 /* If command timeout is specified put caller to wait till that time,
3918 * otherwise it would be blocking wait. If command gets timed out, it
3919 * will be aborted.
3920 */
3921 if (buffer->ioarcb.cmd_timeout == 0) {
3922 wait_for_completion(&cmd->wait_for_completion);
3923 } else if (!wait_for_completion_timeout(
3924 &cmd->wait_for_completion,
3925 msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
3926
3927 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3928 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
3929 cmd->ioa_cb->ioarcb.cdb[0]);
3930
3931 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3932 cancel_cmd = pmcraid_abort_cmd(cmd);
3933 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3934
3935 if (cancel_cmd) {
3936 wait_for_completion(&cancel_cmd->wait_for_completion);
3937 ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
3938 pmcraid_return_cmd(cancel_cmd);
3939
3940 /* if abort task couldn't find the command i.e it got
3941 * completed prior to aborting, return good completion.
3942 * if command got aborted successfully or there was IOA
3943 * reset due to abort task itself getting timedout then
3944 * return -ETIMEDOUT
3945 */
3946 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3947 PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3948 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3949 rc = -ETIMEDOUT;
3950 goto out_handle_response;
3951 }
3952 }
3953
3954 /* no command block for abort task or abort task failed to abort
3955 * the IOARCB, then wait for 150 more seconds and initiate reset
3956 * sequence after timeout
3957 */
3958 if (!wait_for_completion_timeout(
3959 &cmd->wait_for_completion,
3960 msecs_to_jiffies(150 * 1000))) {
3961 pmcraid_reset_bringup(cmd->drv_inst);
3962 rc = -ETIMEDOUT;
3963 }
3964 }
3965
3966out_handle_response:
3967 /* copy entire IOASA buffer and return IOCTL success.
3968 * If copying IOASA to user-buffer fails, return
3969 * EFAULT
3970 */
3971 if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3972 sizeof(struct pmcraid_ioasa))) {
3973 pmcraid_err("failed to copy ioasa buffer to user\n");
3974 rc = -EFAULT;
3975 }
3976
3977 /* If the data transfer was from device, copy the data onto user
3978 * buffers
3979 */
3980 else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3981 rc = pmcraid_copy_sglist(cmd->sglist,
3982 request_buffer,
3983 request_size,
3984 direction);
3985 if (rc) {
3986 pmcraid_err("failed to copy user buffer\n");
3987 rc = -EFAULT;
3988 }
3989 }
3990
3991out_free_sglist:
3992 pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3993 pmcraid_return_cmd(cmd);
3994
3995out_free_buffer:
3996 kfree(buffer);
3997
3998 return rc;
3999}
4000
4001
4002
4003
4004/**
4005 * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
4006 *
4007 * @pinstance: pointer to adapter instance structure
4008 * @cmd: ioctl command passed in
4009 * @buflen: length of user_buffer
4010 * @user_buffer: user buffer pointer
4011 *
4012 * Return Value
4013 * 0 in case of success, otherwise appropriate error code
4014 */
4015static long pmcraid_ioctl_driver(
4016 struct pmcraid_instance *pinstance,
4017 unsigned int cmd,
4018 unsigned int buflen,
4019 void __user *user_buffer
4020)
4021{
4022 int rc = -ENOSYS;
4023
4024 if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
4025 pmcraid_err("ioctl_driver: access fault in request buffer\n");
4026 return -EFAULT;
4027 }
4028
4029 switch (cmd) {
4030 case PMCRAID_IOCTL_RESET_ADAPTER:
4031 pmcraid_reset_bringup(pinstance);
4032 rc = 0;
4033 break;
4034
4035 default:
4036 break;
4037 }
4038
4039 return rc;
4040}
4041
4042/**
4043 * pmcraid_check_ioctl_buffer - check for proper access to user buffer
4044 *
4045 * @cmd: ioctl command
4046 * @arg: user buffer
4047 * @hdr: pointer to kernel memory for pmcraid_ioctl_header
4048 *
4049 * Return Value
4050 * negetive error code if there are access issues, otherwise zero.
4051 * Upon success, returns ioctl header copied out of user buffer.
4052 */
4053
4054static int pmcraid_check_ioctl_buffer(
4055 int cmd,
4056 void __user *arg,
4057 struct pmcraid_ioctl_header *hdr
4058)
4059{
4060 int rc = 0;
4061 int access = VERIFY_READ;
4062
4063 if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
4064 pmcraid_err("couldn't copy ioctl header from user buffer\n");
4065 return -EFAULT;
4066 }
4067
4068 /* check for valid driver signature */
4069 rc = memcmp(hdr->signature,
4070 PMCRAID_IOCTL_SIGNATURE,
4071 sizeof(hdr->signature));
4072 if (rc) {
4073 pmcraid_err("signature verification failed\n");
4074 return -EINVAL;
4075 }
4076
4077 /* check for appropriate buffer access */
4078 if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
4079 access = VERIFY_WRITE;
4080
4081 rc = access_ok(access,
4082 (arg + sizeof(struct pmcraid_ioctl_header)),
4083 hdr->buffer_length);
4084 if (!rc) {
4085 pmcraid_err("access failed for user buffer of size %d\n",
4086 hdr->buffer_length);
4087 return -EFAULT;
4088 }
4089
4090 return 0;
4091}
4092
4093/**
4094 * pmcraid_ioctl - char node ioctl entry point
4095 */
4096static long pmcraid_chr_ioctl(
4097 struct file *filep,
4098 unsigned int cmd,
4099 unsigned long arg
4100)
4101{
4102 struct pmcraid_instance *pinstance = NULL;
4103 struct pmcraid_ioctl_header *hdr = NULL;
4104 int retval = -ENOTTY;
4105
4106 hdr = kmalloc(GFP_KERNEL, sizeof(struct pmcraid_ioctl_header));
4107
4108 if (!hdr) {
4109 pmcraid_err("faile to allocate memory for ioctl header\n");
4110 return -ENOMEM;
4111 }
4112
4113 retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
4114
4115 if (retval) {
4116 pmcraid_info("chr_ioctl: header check failed\n");
4117 kfree(hdr);
4118 return retval;
4119 }
4120
4121 pinstance = filep->private_data;
4122
4123 if (!pinstance) {
4124 pmcraid_info("adapter instance is not found\n");
4125 kfree(hdr);
4126 return -ENOTTY;
4127 }
4128
4129 switch (_IOC_TYPE(cmd)) {
4130
4131 case PMCRAID_PASSTHROUGH_IOCTL:
4132 /* If ioctl code is to download microcode, we need to block
4133 * mid-layer requests.
4134 */
4135 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4136 scsi_block_requests(pinstance->host);
4137
4138 retval = pmcraid_ioctl_passthrough(pinstance,
4139 cmd,
4140 hdr->buffer_length,
4141 arg);
4142
4143 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4144 scsi_unblock_requests(pinstance->host);
4145 break;
4146
4147 case PMCRAID_DRIVER_IOCTL:
4148 arg += sizeof(struct pmcraid_ioctl_header);
4149 retval = pmcraid_ioctl_driver(pinstance,
4150 cmd,
4151 hdr->buffer_length,
4152 (void __user *)arg);
4153 break;
4154
4155 default:
4156 retval = -ENOTTY;
4157 break;
4158 }
4159
4160 kfree(hdr);
4161
4162 return retval;
4163}
4164
4165/**
4166 * File operations structure for management interface
4167 */
4168static const struct file_operations pmcraid_fops = {
4169 .owner = THIS_MODULE,
4170 .open = pmcraid_chr_open,
4171 .release = pmcraid_chr_release,
4172 .fasync = pmcraid_chr_fasync,
4173 .unlocked_ioctl = pmcraid_chr_ioctl,
4174#ifdef CONFIG_COMPAT
4175 .compat_ioctl = pmcraid_chr_ioctl,
4176#endif
4177 .llseek = noop_llseek,
4178};
4179
4180
4181
4182
4183/**
4184 * pmcraid_show_log_level - Display adapter's error logging level
4185 * @dev: class device struct
4186 * @buf: buffer
4187 *
4188 * Return value:
4189 * number of bytes printed to buffer
4190 */
4191static ssize_t pmcraid_show_log_level(
4192 struct device *dev,
4193 struct device_attribute *attr,
4194 char *buf)
4195{
4196 struct Scsi_Host *shost = class_to_shost(dev);
4197 struct pmcraid_instance *pinstance =
4198 (struct pmcraid_instance *)shost->hostdata;
4199 return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
4200}
4201
4202/**
4203 * pmcraid_store_log_level - Change the adapter's error logging level
4204 * @dev: class device struct
4205 * @buf: buffer
4206 * @count: not used
4207 *
4208 * Return value:
4209 * number of bytes printed to buffer
4210 */
4211static ssize_t pmcraid_store_log_level(
4212 struct device *dev,
4213 struct device_attribute *attr,
4214 const char *buf,
4215 size_t count
4216)
4217{
4218 struct Scsi_Host *shost;
4219 struct pmcraid_instance *pinstance;
4220 unsigned long val;
4221
4222 if (strict_strtoul(buf, 10, &val))
4223 return -EINVAL;
4224 /* log-level should be from 0 to 2 */
4225 if (val > 2)
4226 return -EINVAL;
4227
4228 shost = class_to_shost(dev);
4229 pinstance = (struct pmcraid_instance *)shost->hostdata;
4230 pinstance->current_log_level = val;
4231
4232 return strlen(buf);
4233}
4234
4235static struct device_attribute pmcraid_log_level_attr = {
4236 .attr = {
4237 .name = "log_level",
4238 .mode = S_IRUGO | S_IWUSR,
4239 },
4240 .show = pmcraid_show_log_level,
4241 .store = pmcraid_store_log_level,
4242};
4243
4244/**
4245 * pmcraid_show_drv_version - Display driver version
4246 * @dev: class device struct
4247 * @buf: buffer
4248 *
4249 * Return value:
4250 * number of bytes printed to buffer
4251 */
4252static ssize_t pmcraid_show_drv_version(
4253 struct device *dev,
4254 struct device_attribute *attr,
4255 char *buf
4256)
4257{
4258 return snprintf(buf, PAGE_SIZE, "version: %s\n",
4259 PMCRAID_DRIVER_VERSION);
4260}
4261
4262static struct device_attribute pmcraid_driver_version_attr = {
4263 .attr = {
4264 .name = "drv_version",
4265 .mode = S_IRUGO,
4266 },
4267 .show = pmcraid_show_drv_version,
4268};
4269
4270/**
4271 * pmcraid_show_io_adapter_id - Display driver assigned adapter id
4272 * @dev: class device struct
4273 * @buf: buffer
4274 *
4275 * Return value:
4276 * number of bytes printed to buffer
4277 */
4278static ssize_t pmcraid_show_adapter_id(
4279 struct device *dev,
4280 struct device_attribute *attr,
4281 char *buf
4282)
4283{
4284 struct Scsi_Host *shost = class_to_shost(dev);
4285 struct pmcraid_instance *pinstance =
4286 (struct pmcraid_instance *)shost->hostdata;
4287 u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4288 pinstance->pdev->devfn;
4289 u32 aen_group = pmcraid_event_family.id;
4290
4291 return snprintf(buf, PAGE_SIZE,
4292 "adapter id: %d\nminor: %d\naen group: %d\n",
4293 adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4294}
4295
4296static struct device_attribute pmcraid_adapter_id_attr = {
4297 .attr = {
4298 .name = "adapter_id",
4299 .mode = S_IRUGO | S_IWUSR,
4300 },
4301 .show = pmcraid_show_adapter_id,
4302};
4303
4304static struct device_attribute *pmcraid_host_attrs[] = {
4305 &pmcraid_log_level_attr,
4306 &pmcraid_driver_version_attr,
4307 &pmcraid_adapter_id_attr,
4308 NULL,
4309};
4310
4311
4312/* host template structure for pmcraid driver */
4313static struct scsi_host_template pmcraid_host_template = {
4314 .module = THIS_MODULE,
4315 .name = PMCRAID_DRIVER_NAME,
4316 .queuecommand = pmcraid_queuecommand,
4317 .eh_abort_handler = pmcraid_eh_abort_handler,
4318 .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4319 .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4320 .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4321 .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4322
4323 .slave_alloc = pmcraid_slave_alloc,
4324 .slave_configure = pmcraid_slave_configure,
4325 .slave_destroy = pmcraid_slave_destroy,
4326 .change_queue_depth = pmcraid_change_queue_depth,
4327 .change_queue_type = pmcraid_change_queue_type,
4328 .can_queue = PMCRAID_MAX_IO_CMD,
4329 .this_id = -1,
4330 .sg_tablesize = PMCRAID_MAX_IOADLS,
4331 .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4332 .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4333 .use_clustering = ENABLE_CLUSTERING,
4334 .shost_attrs = pmcraid_host_attrs,
4335 .proc_name = PMCRAID_DRIVER_NAME
4336};
4337
4338/*
4339 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4340 * @irq: interrupt vector number
4341 * @dev_id: pointer hrrq_vector
4342 *
4343 * Return Value
4344 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4345 */
4346
4347static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4348{
4349 struct pmcraid_isr_param *hrrq_vector;
4350 struct pmcraid_instance *pinstance;
4351 unsigned long lock_flags;
4352 u32 intrs_val;
4353 int hrrq_id;
4354
4355 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4356 hrrq_id = hrrq_vector->hrrq_id;
4357 pinstance = hrrq_vector->drv_inst;
4358
4359 if (!hrrq_id) {
4360 /* Read the interrupt */
4361 intrs_val = pmcraid_read_interrupts(pinstance);
4362 if (intrs_val &&
4363 ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4364 & DOORBELL_INTR_MSIX_CLR) == 0)) {
4365 /* Any error interrupts including unit_check,
4366 * initiate IOA reset.In case of unit check indicate
4367 * to reset_sequence that IOA unit checked and prepare
4368 * for a dump during reset sequence
4369 */
4370 if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4371 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4372 pinstance->ioa_unit_check = 1;
4373
4374 pmcraid_err("ISR: error interrupts: %x \
4375 initiating reset\n", intrs_val);
4376 spin_lock_irqsave(pinstance->host->host_lock,
4377 lock_flags);
4378 pmcraid_initiate_reset(pinstance);
4379 spin_unlock_irqrestore(
4380 pinstance->host->host_lock,
4381 lock_flags);
4382 }
4383 /* If interrupt was as part of the ioa initialization,
4384 * clear it. Delete the timer and wakeup the
4385 * reset engine to proceed with reset sequence
4386 */
4387 if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4388 pmcraid_clr_trans_op(pinstance);
4389
4390 /* Clear the interrupt register by writing
4391 * to host to ioa doorbell. Once done
4392 * FW will clear the interrupt.
4393 */
4394 iowrite32(DOORBELL_INTR_MSIX_CLR,
4395 pinstance->int_regs.host_ioa_interrupt_reg);
4396 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4397
4398
4399 }
4400 }
4401
4402 tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4403
4404 return IRQ_HANDLED;
4405}
4406
4407/**
4408 * pmcraid_isr - implements legacy interrupt handling routine
4409 *
4410 * @irq: interrupt vector number
4411 * @dev_id: pointer hrrq_vector
4412 *
4413 * Return Value
4414 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4415 */
4416static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4417{
4418 struct pmcraid_isr_param *hrrq_vector;
4419 struct pmcraid_instance *pinstance;
4420 u32 intrs;
4421 unsigned long lock_flags;
4422 int hrrq_id = 0;
4423
4424 /* In case of legacy interrupt mode where interrupts are shared across
4425 * isrs, it may be possible that the current interrupt is not from IOA
4426 */
4427 if (!dev_id) {
4428 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4429 return IRQ_NONE;
4430 }
4431 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4432 pinstance = hrrq_vector->drv_inst;
4433
4434 intrs = pmcraid_read_interrupts(pinstance);
4435
4436 if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4437 return IRQ_NONE;
4438
4439 /* Any error interrupts including unit_check, initiate IOA reset.
4440 * In case of unit check indicate to reset_sequence that IOA unit
4441 * checked and prepare for a dump during reset sequence
4442 */
4443 if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4444
4445 if (intrs & INTRS_IOA_UNIT_CHECK)
4446 pinstance->ioa_unit_check = 1;
4447
4448 iowrite32(intrs,
4449 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4450 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4451 intrs);
4452 intrs = ioread32(
4453 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4454 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4455 pmcraid_initiate_reset(pinstance);
4456 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4457 } else {
4458 /* If interrupt was as part of the ioa initialization,
4459 * clear. Delete the timer and wakeup the
4460 * reset engine to proceed with reset sequence
4461 */
4462 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4463 pmcraid_clr_trans_op(pinstance);
4464 } else {
4465 iowrite32(intrs,
4466 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4467 ioread32(
4468 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4469
4470 tasklet_schedule(
4471 &(pinstance->isr_tasklet[hrrq_id]));
4472 }
4473 }
4474
4475 return IRQ_HANDLED;
4476}
4477
4478
4479/**
4480 * pmcraid_worker_function - worker thread function
4481 *
4482 * @workp: pointer to struct work queue
4483 *
4484 * Return Value
4485 * None
4486 */
4487
4488static void pmcraid_worker_function(struct work_struct *workp)
4489{
4490 struct pmcraid_instance *pinstance;
4491 struct pmcraid_resource_entry *res;
4492 struct pmcraid_resource_entry *temp;
4493 struct scsi_device *sdev;
4494 unsigned long lock_flags;
4495 unsigned long host_lock_flags;
4496 u16 fw_version;
4497 u8 bus, target, lun;
4498
4499 pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4500 /* add resources only after host is added into system */
4501 if (!atomic_read(&pinstance->expose_resources))
4502 return;
4503
4504 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4505
4506 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4507 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4508
4509 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4510 sdev = res->scsi_dev;
4511
4512 /* host_lock must be held before calling
4513 * scsi_device_get
4514 */
4515 spin_lock_irqsave(pinstance->host->host_lock,
4516 host_lock_flags);
4517 if (!scsi_device_get(sdev)) {
4518 spin_unlock_irqrestore(
4519 pinstance->host->host_lock,
4520 host_lock_flags);
4521 pmcraid_info("deleting %x from midlayer\n",
4522 res->cfg_entry.resource_address);
4523 list_move_tail(&res->queue,
4524 &pinstance->free_res_q);
4525 spin_unlock_irqrestore(
4526 &pinstance->resource_lock,
4527 lock_flags);
4528 scsi_remove_device(sdev);
4529 scsi_device_put(sdev);
4530 spin_lock_irqsave(&pinstance->resource_lock,
4531 lock_flags);
4532 res->change_detected = 0;
4533 } else {
4534 spin_unlock_irqrestore(
4535 pinstance->host->host_lock,
4536 host_lock_flags);
4537 }
4538 }
4539 }
4540
4541 list_for_each_entry(res, &pinstance->used_res_q, queue) {
4542
4543 if (res->change_detected == RES_CHANGE_ADD) {
4544
4545 if (!pmcraid_expose_resource(fw_version,
4546 &res->cfg_entry))
4547 continue;
4548
4549 if (RES_IS_VSET(res->cfg_entry)) {
4550 bus = PMCRAID_VSET_BUS_ID;
4551 if (fw_version <= PMCRAID_FW_VERSION_1)
4552 target = res->cfg_entry.unique_flags1;
4553 else
4554 target = res->cfg_entry.array_id & 0xFF;
4555 lun = PMCRAID_VSET_LUN_ID;
4556 } else {
4557 bus = PMCRAID_PHYS_BUS_ID;
4558 target =
4559 RES_TARGET(
4560 res->cfg_entry.resource_address);
4561 lun = RES_LUN(res->cfg_entry.resource_address);
4562 }
4563
4564 res->change_detected = 0;
4565 spin_unlock_irqrestore(&pinstance->resource_lock,
4566 lock_flags);
4567 scsi_add_device(pinstance->host, bus, target, lun);
4568 spin_lock_irqsave(&pinstance->resource_lock,
4569 lock_flags);
4570 }
4571 }
4572
4573 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4574}
4575
4576/**
4577 * pmcraid_tasklet_function - Tasklet function
4578 *
4579 * @instance: pointer to msix param structure
4580 *
4581 * Return Value
4582 * None
4583 */
4584static void pmcraid_tasklet_function(unsigned long instance)
4585{
4586 struct pmcraid_isr_param *hrrq_vector;
4587 struct pmcraid_instance *pinstance;
4588 unsigned long hrrq_lock_flags;
4589 unsigned long pending_lock_flags;
4590 unsigned long host_lock_flags;
4591 spinlock_t *lockp; /* hrrq buffer lock */
4592 int id;
4593 __le32 resp;
4594
4595 hrrq_vector = (struct pmcraid_isr_param *)instance;
4596 pinstance = hrrq_vector->drv_inst;
4597 id = hrrq_vector->hrrq_id;
4598 lockp = &(pinstance->hrrq_lock[id]);
4599
4600 /* loop through each of the commands responded by IOA. Each HRRQ buf is
4601 * protected by its own lock. Traversals must be done within this lock
4602 * as there may be multiple tasklets running on multiple CPUs. Note
4603 * that the lock is held just for picking up the response handle and
4604 * manipulating hrrq_curr/toggle_bit values.
4605 */
4606 spin_lock_irqsave(lockp, hrrq_lock_flags);
4607
4608 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4609
4610 while ((resp & HRRQ_TOGGLE_BIT) ==
4611 pinstance->host_toggle_bit[id]) {
4612
4613 int cmd_index = resp >> 2;
4614 struct pmcraid_cmd *cmd = NULL;
4615
4616 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4617 pinstance->hrrq_curr[id]++;
4618 } else {
4619 pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4620 pinstance->host_toggle_bit[id] ^= 1u;
4621 }
4622
4623 if (cmd_index >= PMCRAID_MAX_CMD) {
4624 /* In case of invalid response handle, log message */
4625 pmcraid_err("Invalid response handle %d\n", cmd_index);
4626 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4627 continue;
4628 }
4629
4630 cmd = pinstance->cmd_list[cmd_index];
4631 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4632
4633 spin_lock_irqsave(&pinstance->pending_pool_lock,
4634 pending_lock_flags);
4635 list_del(&cmd->free_list);
4636 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4637 pending_lock_flags);
4638 del_timer(&cmd->timer);
4639 atomic_dec(&pinstance->outstanding_cmds);
4640
4641 if (cmd->cmd_done == pmcraid_ioa_reset) {
4642 spin_lock_irqsave(pinstance->host->host_lock,
4643 host_lock_flags);
4644 cmd->cmd_done(cmd);
4645 spin_unlock_irqrestore(pinstance->host->host_lock,
4646 host_lock_flags);
4647 } else if (cmd->cmd_done != NULL) {
4648 cmd->cmd_done(cmd);
4649 }
4650 /* loop over until we are done with all responses */
4651 spin_lock_irqsave(lockp, hrrq_lock_flags);
4652 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4653 }
4654
4655 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4656}
4657
4658/**
4659 * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4660 * @pinstance: pointer to adapter instance structure
4661 *
4662 * This routine un-registers registered interrupt handler and
4663 * also frees irqs/vectors.
4664 *
4665 * Retun Value
4666 * None
4667 */
4668static
4669void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4670{
4671 int i;
4672
4673 for (i = 0; i < pinstance->num_hrrq; i++)
4674 free_irq(pinstance->hrrq_vector[i].vector,
4675 &(pinstance->hrrq_vector[i]));
4676
4677 if (pinstance->interrupt_mode) {
4678 pci_disable_msix(pinstance->pdev);
4679 pinstance->interrupt_mode = 0;
4680 }
4681}
4682
4683/**
4684 * pmcraid_register_interrupt_handler - registers interrupt handler
4685 * @pinstance: pointer to per-adapter instance structure
4686 *
4687 * Return Value
4688 * 0 on success, non-zero error code otherwise.
4689 */
4690static int
4691pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4692{
4693 int rc;
4694 struct pci_dev *pdev = pinstance->pdev;
4695
4696 if ((pmcraid_enable_msix) &&
4697 (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
4698 int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
4699 struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
4700 int i;
4701 for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
4702 entries[i].entry = i;
4703
4704 rc = pci_enable_msix(pdev, entries, num_hrrq);
4705 if (rc < 0)
4706 goto pmcraid_isr_legacy;
4707
4708 /* Check how many MSIX vectors are allocated and register
4709 * msi-x handlers for each of them giving appropriate buffer
4710 */
4711 if (rc > 0) {
4712 num_hrrq = rc;
4713 if (pci_enable_msix(pdev, entries, num_hrrq))
4714 goto pmcraid_isr_legacy;
4715 }
4716
4717 for (i = 0; i < num_hrrq; i++) {
4718 pinstance->hrrq_vector[i].hrrq_id = i;
4719 pinstance->hrrq_vector[i].drv_inst = pinstance;
4720 pinstance->hrrq_vector[i].vector = entries[i].vector;
4721 rc = request_irq(pinstance->hrrq_vector[i].vector,
4722 pmcraid_isr_msix, 0,
4723 PMCRAID_DRIVER_NAME,
4724 &(pinstance->hrrq_vector[i]));
4725
4726 if (rc) {
4727 int j;
4728 for (j = 0; j < i; j++)
4729 free_irq(entries[j].vector,
4730 &(pinstance->hrrq_vector[j]));
4731 pci_disable_msix(pdev);
4732 goto pmcraid_isr_legacy;
4733 }
4734 }
4735
4736 pinstance->num_hrrq = num_hrrq;
4737 pinstance->interrupt_mode = 1;
4738 iowrite32(DOORBELL_INTR_MODE_MSIX,
4739 pinstance->int_regs.host_ioa_interrupt_reg);
4740 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4741 goto pmcraid_isr_out;
4742 }
4743
4744pmcraid_isr_legacy:
4745 /* If MSI-X registration failed fallback to legacy mode, where
4746 * only one hrrq entry will be used
4747 */
4748 pinstance->hrrq_vector[0].hrrq_id = 0;
4749 pinstance->hrrq_vector[0].drv_inst = pinstance;
4750 pinstance->hrrq_vector[0].vector = pdev->irq;
4751 pinstance->num_hrrq = 1;
4752 rc = 0;
4753
4754 rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
4755 PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
4756pmcraid_isr_out:
4757 return rc;
4758}
4759
4760/**
4761 * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4762 * @pinstance: per adapter instance structure pointer
4763 * @max_index: number of buffer blocks to release
4764 *
4765 * Return Value
4766 * None
4767 */
4768static void
4769pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4770{
4771 int i;
4772 for (i = 0; i < max_index; i++) {
4773 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4774 pinstance->cmd_list[i] = NULL;
4775 }
4776 kmem_cache_destroy(pinstance->cmd_cachep);
4777 pinstance->cmd_cachep = NULL;
4778}
4779
4780/**
4781 * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4782 * @pinstance: pointer to per adapter instance structure
4783 * @max_index: number of buffers (from 0 onwards) to release
4784 *
4785 * This function assumes that the command blocks for which control blocks are
4786 * linked are not released.
4787 *
4788 * Return Value
4789 * None
4790 */
4791static void
4792pmcraid_release_control_blocks(
4793 struct pmcraid_instance *pinstance,
4794 int max_index
4795)
4796{
4797 int i;
4798
4799 if (pinstance->control_pool == NULL)
4800 return;
4801
4802 for (i = 0; i < max_index; i++) {
4803 pci_pool_free(pinstance->control_pool,
4804 pinstance->cmd_list[i]->ioa_cb,
4805 pinstance->cmd_list[i]->ioa_cb_bus_addr);
4806 pinstance->cmd_list[i]->ioa_cb = NULL;
4807 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4808 }
4809 pci_pool_destroy(pinstance->control_pool);
4810 pinstance->control_pool = NULL;
4811}
4812
4813/**
4814 * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4815 * @pinstance - pointer to per adapter instance structure
4816 *
4817 * Allocates memory for command blocks using kernel slab allocator.
4818 *
4819 * Return Value
4820 * 0 in case of success; -ENOMEM in case of failure
4821 */
4822static int __devinit
4823pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4824{
4825 int i;
4826
4827 sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4828 pinstance->host->unique_id);
4829
4830
4831 pinstance->cmd_cachep = kmem_cache_create(
4832 pinstance->cmd_pool_name,
4833 sizeof(struct pmcraid_cmd), 0,
4834 SLAB_HWCACHE_ALIGN, NULL);
4835 if (!pinstance->cmd_cachep)
4836 return -ENOMEM;
4837
4838 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4839 pinstance->cmd_list[i] =
4840 kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4841 if (!pinstance->cmd_list[i]) {
4842 pmcraid_release_cmd_blocks(pinstance, i);
4843 return -ENOMEM;
4844 }
4845 }
4846 return 0;
4847}
4848
4849/**
4850 * pmcraid_allocate_control_blocks - allocates memory control blocks
4851 * @pinstance : pointer to per adapter instance structure
4852 *
4853 * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4854 * and IOASAs. This is called after command blocks are already allocated.
4855 *
4856 * Return Value
4857 * 0 in case it can allocate all control blocks, otherwise -ENOMEM
4858 */
4859static int __devinit
4860pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4861{
4862 int i;
4863
4864 sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4865 pinstance->host->unique_id);
4866
4867 pinstance->control_pool =
4868 pci_pool_create(pinstance->ctl_pool_name,
4869 pinstance->pdev,
4870 sizeof(struct pmcraid_control_block),
4871 PMCRAID_IOARCB_ALIGNMENT, 0);
4872
4873 if (!pinstance->control_pool)
4874 return -ENOMEM;
4875
4876 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4877 pinstance->cmd_list[i]->ioa_cb =
4878 pci_pool_alloc(
4879 pinstance->control_pool,
4880 GFP_KERNEL,
4881 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4882
4883 if (!pinstance->cmd_list[i]->ioa_cb) {
4884 pmcraid_release_control_blocks(pinstance, i);
4885 return -ENOMEM;
4886 }
4887 memset(pinstance->cmd_list[i]->ioa_cb, 0,
4888 sizeof(struct pmcraid_control_block));
4889 }
4890 return 0;
4891}
4892
4893/**
4894 * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4895 * @pinstance: pointer to per adapter instance structure
4896 * @maxindex: size of hrrq buffer pointer array
4897 *
4898 * Return Value
4899 * None
4900 */
4901static void
4902pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4903{
4904 int i;
4905 for (i = 0; i < maxindex; i++) {
4906
4907 pci_free_consistent(pinstance->pdev,
4908 HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4909 pinstance->hrrq_start[i],
4910 pinstance->hrrq_start_bus_addr[i]);
4911
4912 /* reset pointers and toggle bit to zeros */
4913 pinstance->hrrq_start[i] = NULL;
4914 pinstance->hrrq_start_bus_addr[i] = 0;
4915 pinstance->host_toggle_bit[i] = 0;
4916 }
4917}
4918
4919/**
4920 * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4921 * @pinstance: pointer to per adapter instance structure
4922 *
4923 * Return value
4924 * 0 hrrq buffers are allocated, -ENOMEM otherwise.
4925 */
4926static int __devinit
4927pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4928{
4929 int i, buffer_size;
4930
4931 buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4932
4933 for (i = 0; i < pinstance->num_hrrq; i++) {
4934 pinstance->hrrq_start[i] =
4935 pci_alloc_consistent(
4936 pinstance->pdev,
4937 buffer_size,
4938 &(pinstance->hrrq_start_bus_addr[i]));
4939
4940 if (pinstance->hrrq_start[i] == 0) {
4941 pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4942 i);
4943 pmcraid_release_host_rrqs(pinstance, i);
4944 return -ENOMEM;
4945 }
4946
4947 memset(pinstance->hrrq_start[i], 0, buffer_size);
4948 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4949 pinstance->hrrq_end[i] =
4950 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4951 pinstance->host_toggle_bit[i] = 1;
4952 spin_lock_init(&pinstance->hrrq_lock[i]);
4953 }
4954 return 0;
4955}
4956
4957/**
4958 * pmcraid_release_hcams - release HCAM buffers
4959 *
4960 * @pinstance: pointer to per adapter instance structure
4961 *
4962 * Return value
4963 * none
4964 */
4965static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4966{
4967 if (pinstance->ccn.msg != NULL) {
4968 pci_free_consistent(pinstance->pdev,
4969 PMCRAID_AEN_HDR_SIZE +
4970 sizeof(struct pmcraid_hcam_ccn_ext),
4971 pinstance->ccn.msg,
4972 pinstance->ccn.baddr);
4973
4974 pinstance->ccn.msg = NULL;
4975 pinstance->ccn.hcam = NULL;
4976 pinstance->ccn.baddr = 0;
4977 }
4978
4979 if (pinstance->ldn.msg != NULL) {
4980 pci_free_consistent(pinstance->pdev,
4981 PMCRAID_AEN_HDR_SIZE +
4982 sizeof(struct pmcraid_hcam_ldn),
4983 pinstance->ldn.msg,
4984 pinstance->ldn.baddr);
4985
4986 pinstance->ldn.msg = NULL;
4987 pinstance->ldn.hcam = NULL;
4988 pinstance->ldn.baddr = 0;
4989 }
4990}
4991
4992/**
4993 * pmcraid_allocate_hcams - allocates HCAM buffers
4994 * @pinstance : pointer to per adapter instance structure
4995 *
4996 * Return Value:
4997 * 0 in case of successful allocation, non-zero otherwise
4998 */
4999static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
5000{
5001 pinstance->ccn.msg = pci_alloc_consistent(
5002 pinstance->pdev,
5003 PMCRAID_AEN_HDR_SIZE +
5004 sizeof(struct pmcraid_hcam_ccn_ext),
5005 &(pinstance->ccn.baddr));
5006
5007 pinstance->ldn.msg = pci_alloc_consistent(
5008 pinstance->pdev,
5009 PMCRAID_AEN_HDR_SIZE +
5010 sizeof(struct pmcraid_hcam_ldn),
5011 &(pinstance->ldn.baddr));
5012
5013 if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
5014 pmcraid_release_hcams(pinstance);
5015 } else {
5016 pinstance->ccn.hcam =
5017 (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
5018 pinstance->ldn.hcam =
5019 (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
5020
5021 atomic_set(&pinstance->ccn.ignore, 0);
5022 atomic_set(&pinstance->ldn.ignore, 0);
5023 }
5024
5025 return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
5026}
5027
5028/**
5029 * pmcraid_release_config_buffers - release config.table buffers
5030 * @pinstance: pointer to per adapter instance structure
5031 *
5032 * Return Value
5033 * none
5034 */
5035static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
5036{
5037 if (pinstance->cfg_table != NULL &&
5038 pinstance->cfg_table_bus_addr != 0) {
5039 pci_free_consistent(pinstance->pdev,
5040 sizeof(struct pmcraid_config_table),
5041 pinstance->cfg_table,
5042 pinstance->cfg_table_bus_addr);
5043 pinstance->cfg_table = NULL;
5044 pinstance->cfg_table_bus_addr = 0;
5045 }
5046
5047 if (pinstance->res_entries != NULL) {
5048 int i;
5049
5050 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5051 list_del(&pinstance->res_entries[i].queue);
5052 kfree(pinstance->res_entries);
5053 pinstance->res_entries = NULL;
5054 }
5055
5056 pmcraid_release_hcams(pinstance);
5057}
5058
5059/**
5060 * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
5061 * @pinstance : pointer to per adapter instance structure
5062 *
5063 * Return Value
5064 * 0 for successful allocation, -ENOMEM for any failure
5065 */
5066static int __devinit
5067pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
5068{
5069 int i;
5070
5071 pinstance->res_entries =
5072 kzalloc(sizeof(struct pmcraid_resource_entry) *
5073 PMCRAID_MAX_RESOURCES, GFP_KERNEL);
5074
5075 if (NULL == pinstance->res_entries) {
5076 pmcraid_err("failed to allocate memory for resource table\n");
5077 return -ENOMEM;
5078 }
5079
5080 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5081 list_add_tail(&pinstance->res_entries[i].queue,
5082 &pinstance->free_res_q);
5083
5084 pinstance->cfg_table =
5085 pci_alloc_consistent(pinstance->pdev,
5086 sizeof(struct pmcraid_config_table),
5087 &pinstance->cfg_table_bus_addr);
5088
5089 if (NULL == pinstance->cfg_table) {
5090 pmcraid_err("couldn't alloc DMA memory for config table\n");
5091 pmcraid_release_config_buffers(pinstance);
5092 return -ENOMEM;
5093 }
5094
5095 if (pmcraid_allocate_hcams(pinstance)) {
5096 pmcraid_err("could not alloc DMA memory for HCAMS\n");
5097 pmcraid_release_config_buffers(pinstance);
5098 return -ENOMEM;
5099 }
5100
5101 return 0;
5102}
5103
5104/**
5105 * pmcraid_init_tasklets - registers tasklets for response handling
5106 *
5107 * @pinstance: pointer adapter instance structure
5108 *
5109 * Return value
5110 * none
5111 */
5112static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
5113{
5114 int i;
5115 for (i = 0; i < pinstance->num_hrrq; i++)
5116 tasklet_init(&pinstance->isr_tasklet[i],
5117 pmcraid_tasklet_function,
5118 (unsigned long)&pinstance->hrrq_vector[i]);
5119}
5120
5121/**
5122 * pmcraid_kill_tasklets - destroys tasklets registered for response handling
5123 *
5124 * @pinstance: pointer to adapter instance structure
5125 *
5126 * Return value
5127 * none
5128 */
5129static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
5130{
5131 int i;
5132 for (i = 0; i < pinstance->num_hrrq; i++)
5133 tasklet_kill(&pinstance->isr_tasklet[i]);
5134}
5135
5136/**
5137 * pmcraid_release_buffers - release per-adapter buffers allocated
5138 *
5139 * @pinstance: pointer to adapter soft state
5140 *
5141 * Return Value
5142 * none
5143 */
5144static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
5145{
5146 pmcraid_release_config_buffers(pinstance);
5147 pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
5148 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5149 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5150
5151 if (pinstance->inq_data != NULL) {
5152 pci_free_consistent(pinstance->pdev,
5153 sizeof(struct pmcraid_inquiry_data),
5154 pinstance->inq_data,
5155 pinstance->inq_data_baddr);
5156
5157 pinstance->inq_data = NULL;
5158 pinstance->inq_data_baddr = 0;
5159 }
5160
5161 if (pinstance->timestamp_data != NULL) {
5162 pci_free_consistent(pinstance->pdev,
5163 sizeof(struct pmcraid_timestamp_data),
5164 pinstance->timestamp_data,
5165 pinstance->timestamp_data_baddr);
5166
5167 pinstance->timestamp_data = NULL;
5168 pinstance->timestamp_data_baddr = 0;
5169 }
5170}
5171
5172/**
5173 * pmcraid_init_buffers - allocates memory and initializes various structures
5174 * @pinstance: pointer to per adapter instance structure
5175 *
5176 * This routine pre-allocates memory based on the type of block as below:
5177 * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
5178 * IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator
5179 * config-table entries : DMAable memory using pci_alloc_consistent
5180 * HostRRQs : DMAable memory, using pci_alloc_consistent
5181 *
5182 * Return Value
5183 * 0 in case all of the blocks are allocated, -ENOMEM otherwise.
5184 */
5185static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance)
5186{
5187 int i;
5188
5189 if (pmcraid_allocate_host_rrqs(pinstance)) {
5190 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
5191 pinstance->num_hrrq);
5192 return -ENOMEM;
5193 }
5194
5195 if (pmcraid_allocate_config_buffers(pinstance)) {
5196 pmcraid_err("couldn't allocate memory for config buffers\n");
5197 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5198 return -ENOMEM;
5199 }
5200
5201 if (pmcraid_allocate_cmd_blocks(pinstance)) {
5202 pmcraid_err("couldn't allocate memory for cmd blocks\n");
5203 pmcraid_release_config_buffers(pinstance);
5204 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5205 return -ENOMEM;
5206 }
5207
5208 if (pmcraid_allocate_control_blocks(pinstance)) {
5209 pmcraid_err("couldn't allocate memory control blocks\n");
5210 pmcraid_release_config_buffers(pinstance);
5211 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5212 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5213 return -ENOMEM;
5214 }
5215
5216 /* allocate DMAable memory for page D0 INQUIRY buffer */
5217 pinstance->inq_data = pci_alloc_consistent(
5218 pinstance->pdev,
5219 sizeof(struct pmcraid_inquiry_data),
5220 &pinstance->inq_data_baddr);
5221
5222 if (pinstance->inq_data == NULL) {
5223 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
5224 pmcraid_release_buffers(pinstance);
5225 return -ENOMEM;
5226 }
5227
5228 /* allocate DMAable memory for set timestamp data buffer */
5229 pinstance->timestamp_data = pci_alloc_consistent(
5230 pinstance->pdev,
5231 sizeof(struct pmcraid_timestamp_data),
5232 &pinstance->timestamp_data_baddr);
5233
5234 if (pinstance->timestamp_data == NULL) {
5235 pmcraid_err("couldn't allocate DMA memory for \
5236 set time_stamp \n");
5237 pmcraid_release_buffers(pinstance);
5238 return -ENOMEM;
5239 }
5240
5241
5242 /* Initialize all the command blocks and add them to free pool. No
5243 * need to lock (free_pool_lock) as this is done in initialization
5244 * itself
5245 */
5246 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5247 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5248 pmcraid_init_cmdblk(cmdp, i);
5249 cmdp->drv_inst = pinstance;
5250 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5251 }
5252
5253 return 0;
5254}
5255
5256/**
5257 * pmcraid_reinit_buffers - resets various buffer pointers
5258 * @pinstance: pointer to adapter instance
5259 * Return value
5260 * none
5261 */
5262static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5263{
5264 int i;
5265 int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5266
5267 for (i = 0; i < pinstance->num_hrrq; i++) {
5268 memset(pinstance->hrrq_start[i], 0, buffer_size);
5269 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5270 pinstance->hrrq_end[i] =
5271 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5272 pinstance->host_toggle_bit[i] = 1;
5273 }
5274}
5275
5276/**
5277 * pmcraid_init_instance - initialize per instance data structure
5278 * @pdev: pointer to pci device structure
5279 * @host: pointer to Scsi_Host structure
5280 * @mapped_pci_addr: memory mapped IOA configuration registers
5281 *
5282 * Return Value
5283 * 0 on success, non-zero in case of any failure
5284 */
5285static int __devinit pmcraid_init_instance(
5286 struct pci_dev *pdev,
5287 struct Scsi_Host *host,
5288 void __iomem *mapped_pci_addr
5289)
5290{
5291 struct pmcraid_instance *pinstance =
5292 (struct pmcraid_instance *)host->hostdata;
5293
5294 pinstance->host = host;
5295 pinstance->pdev = pdev;
5296
5297 /* Initialize register addresses */
5298 pinstance->mapped_dma_addr = mapped_pci_addr;
5299
5300 /* Initialize chip-specific details */
5301 {
5302 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5303 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5304
5305 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5306
5307 pint_regs->ioa_host_interrupt_reg =
5308 mapped_pci_addr + chip_cfg->ioa_host_intr;
5309 pint_regs->ioa_host_interrupt_clr_reg =
5310 mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5311 pint_regs->ioa_host_msix_interrupt_reg =
5312 mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5313 pint_regs->host_ioa_interrupt_reg =
5314 mapped_pci_addr + chip_cfg->host_ioa_intr;
5315 pint_regs->host_ioa_interrupt_clr_reg =
5316 mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5317
5318 /* Current version of firmware exposes interrupt mask set
5319 * and mask clr registers through memory mapped bar0.
5320 */
5321 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5322 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5323 pint_regs->ioa_host_interrupt_mask_reg =
5324 mapped_pci_addr + chip_cfg->ioa_host_mask;
5325 pint_regs->ioa_host_interrupt_mask_clr_reg =
5326 mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5327 pint_regs->global_interrupt_mask_reg =
5328 mapped_pci_addr + chip_cfg->global_intr_mask;
5329 };
5330
5331 pinstance->ioa_reset_attempts = 0;
5332 init_waitqueue_head(&pinstance->reset_wait_q);
5333
5334 atomic_set(&pinstance->outstanding_cmds, 0);
5335 atomic_set(&pinstance->last_message_id, 0);
5336 atomic_set(&pinstance->expose_resources, 0);
5337
5338 INIT_LIST_HEAD(&pinstance->free_res_q);
5339 INIT_LIST_HEAD(&pinstance->used_res_q);
5340 INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5341 INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5342
5343 spin_lock_init(&pinstance->free_pool_lock);
5344 spin_lock_init(&pinstance->pending_pool_lock);
5345 spin_lock_init(&pinstance->resource_lock);
5346 mutex_init(&pinstance->aen_queue_lock);
5347
5348 /* Work-queue (Shared) for deferred processing error handling */
5349 INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5350
5351 /* Initialize the default log_level */
5352 pinstance->current_log_level = pmcraid_log_level;
5353
5354 /* Setup variables required for reset engine */
5355 pinstance->ioa_state = IOA_STATE_UNKNOWN;
5356 pinstance->reset_cmd = NULL;
5357 return 0;
5358}
5359
5360/**
5361 * pmcraid_shutdown - shutdown adapter controller.
5362 * @pdev: pci device struct
5363 *
5364 * Issues an adapter shutdown to the card waits for its completion
5365 *
5366 * Return value
5367 * none
5368 */
5369static void pmcraid_shutdown(struct pci_dev *pdev)
5370{
5371 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5372 pmcraid_reset_bringdown(pinstance);
5373}
5374
5375
5376/**
5377 * pmcraid_get_minor - returns unused minor number from minor number bitmap
5378 */
5379static unsigned short pmcraid_get_minor(void)
5380{
5381 int minor;
5382
5383 minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
5384 __set_bit(minor, pmcraid_minor);
5385 return minor;
5386}
5387
5388/**
5389 * pmcraid_release_minor - releases given minor back to minor number bitmap
5390 */
5391static void pmcraid_release_minor(unsigned short minor)
5392{
5393 __clear_bit(minor, pmcraid_minor);
5394}
5395
5396/**
5397 * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5398 *
5399 * @pinstance: pointer to adapter instance for which to register device
5400 *
5401 * Return value
5402 * 0 in case of success, otherwise non-zero
5403 */
5404static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5405{
5406 int minor;
5407 int error;
5408
5409 minor = pmcraid_get_minor();
5410 cdev_init(&pinstance->cdev, &pmcraid_fops);
5411 pinstance->cdev.owner = THIS_MODULE;
5412
5413 error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5414
5415 if (error)
5416 pmcraid_release_minor(minor);
5417 else
5418 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5419 NULL, "%s%u", PMCRAID_DEVFILE, minor);
5420 return error;
5421}
5422
5423/**
5424 * pmcraid_release_chrdev - unregisters per-adapter management interface
5425 *
5426 * @pinstance: pointer to adapter instance structure
5427 *
5428 * Return value
5429 * none
5430 */
5431static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5432{
5433 pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5434 device_destroy(pmcraid_class,
5435 MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5436 cdev_del(&pinstance->cdev);
5437}
5438
5439/**
5440 * pmcraid_remove - IOA hot plug remove entry point
5441 * @pdev: pci device struct
5442 *
5443 * Return value
5444 * none
5445 */
5446static void __devexit pmcraid_remove(struct pci_dev *pdev)
5447{
5448 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5449
5450 /* remove the management interface (/dev file) for this device */
5451 pmcraid_release_chrdev(pinstance);
5452
5453 /* remove host template from scsi midlayer */
5454 scsi_remove_host(pinstance->host);
5455
5456 /* block requests from mid-layer */
5457 scsi_block_requests(pinstance->host);
5458
5459 /* initiate shutdown adapter */
5460 pmcraid_shutdown(pdev);
5461
5462 pmcraid_disable_interrupts(pinstance, ~0);
5463 flush_work_sync(&pinstance->worker_q);
5464
5465 pmcraid_kill_tasklets(pinstance);
5466 pmcraid_unregister_interrupt_handler(pinstance);
5467 pmcraid_release_buffers(pinstance);
5468 iounmap(pinstance->mapped_dma_addr);
5469 pci_release_regions(pdev);
5470 scsi_host_put(pinstance->host);
5471 pci_disable_device(pdev);
5472
5473 return;
5474}
5475
5476#ifdef CONFIG_PM
5477/**
5478 * pmcraid_suspend - driver suspend entry point for power management
5479 * @pdev: PCI device structure
5480 * @state: PCI power state to suspend routine
5481 *
5482 * Return Value - 0 always
5483 */
5484static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
5485{
5486 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5487
5488 pmcraid_shutdown(pdev);
5489 pmcraid_disable_interrupts(pinstance, ~0);
5490 pmcraid_kill_tasklets(pinstance);
5491 pci_set_drvdata(pinstance->pdev, pinstance);
5492 pmcraid_unregister_interrupt_handler(pinstance);
5493 pci_save_state(pdev);
5494 pci_disable_device(pdev);
5495 pci_set_power_state(pdev, pci_choose_state(pdev, state));
5496
5497 return 0;
5498}
5499
5500/**
5501 * pmcraid_resume - driver resume entry point PCI power management
5502 * @pdev: PCI device structure
5503 *
5504 * Return Value - 0 in case of success. Error code in case of any failure
5505 */
5506static int pmcraid_resume(struct pci_dev *pdev)
5507{
5508 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5509 struct Scsi_Host *host = pinstance->host;
5510 int rc;
5511
5512 pci_set_power_state(pdev, PCI_D0);
5513 pci_enable_wake(pdev, PCI_D0, 0);
5514 pci_restore_state(pdev);
5515
5516 rc = pci_enable_device(pdev);
5517
5518 if (rc) {
5519 dev_err(&pdev->dev, "resume: Enable device failed\n");
5520 return rc;
5521 }
5522
5523 pci_set_master(pdev);
5524
5525 if ((sizeof(dma_addr_t) == 4) ||
5526 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5527 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5528
5529 if (rc == 0)
5530 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5531
5532 if (rc != 0) {
5533 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5534 goto disable_device;
5535 }
5536
5537 pmcraid_disable_interrupts(pinstance, ~0);
5538 atomic_set(&pinstance->outstanding_cmds, 0);
5539 rc = pmcraid_register_interrupt_handler(pinstance);
5540
5541 if (rc) {
5542 dev_err(&pdev->dev,
5543 "resume: couldn't register interrupt handlers\n");
5544 rc = -ENODEV;
5545 goto release_host;
5546 }
5547
5548 pmcraid_init_tasklets(pinstance);
5549 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5550
5551 /* Start with hard reset sequence which brings up IOA to operational
5552 * state as well as completes the reset sequence.
5553 */
5554 pinstance->ioa_hard_reset = 1;
5555
5556 /* Start IOA firmware initialization and bring card to Operational
5557 * state.
5558 */
5559 if (pmcraid_reset_bringup(pinstance)) {
5560 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5561 rc = -ENODEV;
5562 goto release_tasklets;
5563 }
5564
5565 return 0;
5566
5567release_tasklets:
5568 pmcraid_disable_interrupts(pinstance, ~0);
5569 pmcraid_kill_tasklets(pinstance);
5570 pmcraid_unregister_interrupt_handler(pinstance);
5571
5572release_host:
5573 scsi_host_put(host);
5574
5575disable_device:
5576 pci_disable_device(pdev);
5577
5578 return rc;
5579}
5580
5581#else
5582
5583#define pmcraid_suspend NULL
5584#define pmcraid_resume NULL
5585
5586#endif /* CONFIG_PM */
5587
5588/**
5589 * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5590 * completion of the ioa reset
5591 * @cmd: pointer to reset command block
5592 */
5593static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5594{
5595 struct pmcraid_instance *pinstance = cmd->drv_inst;
5596 unsigned long flags;
5597
5598 spin_lock_irqsave(pinstance->host->host_lock, flags);
5599 pmcraid_ioa_reset(cmd);
5600 spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5601 scsi_unblock_requests(pinstance->host);
5602 schedule_work(&pinstance->worker_q);
5603}
5604
5605/**
5606 * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5607 *
5608 * @cmd: pointer to pmcraid_cmd structure
5609 *
5610 * Return Value
5611 * 0 for success or non-zero for failure cases
5612 */
5613static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5614{
5615 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5616 void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5617
5618 pmcraid_reinit_cmdblk(cmd);
5619
5620 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5621 ioarcb->request_type = REQ_TYPE_IOACMD;
5622 ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5623 ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5624
5625 /* If this was called as part of resource table reinitialization due to
5626 * lost CCN, it is enough to return the command block back to free pool
5627 * as part of set_supported_devs completion function.
5628 */
5629 if (cmd->drv_inst->reinit_cfg_table) {
5630 cmd->drv_inst->reinit_cfg_table = 0;
5631 cmd->release = 1;
5632 cmd_done = pmcraid_reinit_cfgtable_done;
5633 }
5634
5635 /* we will be done with the reset sequence after set supported devices,
5636 * setup the done function to return the command block back to free
5637 * pool
5638 */
5639 pmcraid_send_cmd(cmd,
5640 cmd_done,
5641 PMCRAID_SET_SUP_DEV_TIMEOUT,
5642 pmcraid_timeout_handler);
5643 return;
5644}
5645
5646/**
5647 * pmcraid_set_timestamp - set the timestamp to IOAFP
5648 *
5649 * @cmd: pointer to pmcraid_cmd structure
5650 *
5651 * Return Value
5652 * 0 for success or non-zero for failure cases
5653 */
5654static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5655{
5656 struct pmcraid_instance *pinstance = cmd->drv_inst;
5657 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5658 __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5659 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5660
5661 struct timeval tv;
5662 __le64 timestamp;
5663
5664 do_gettimeofday(&tv);
5665 timestamp = tv.tv_sec * 1000;
5666
5667 pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5668 pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5669 pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5670 pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5671 pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5672 pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp) >> 40);
5673
5674 pmcraid_reinit_cmdblk(cmd);
5675 ioarcb->request_type = REQ_TYPE_SCSI;
5676 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5677 ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5678 ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5679 memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5680
5681 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5682 offsetof(struct pmcraid_ioarcb,
5683 add_data.u.ioadl[0]));
5684 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5685 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5686
5687 ioarcb->request_flags0 |= NO_LINK_DESCS;
5688 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5689 ioarcb->data_transfer_length =
5690 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5691 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5692 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5693 ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5694 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5695
5696 if (!pinstance->timestamp_error) {
5697 pinstance->timestamp_error = 0;
5698 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5699 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5700 } else {
5701 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5702 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5703 return;
5704 }
5705}
5706
5707
5708/**
5709 * pmcraid_init_res_table - Initialize the resource table
5710 * @cmd: pointer to pmcraid command struct
5711 *
5712 * This function looks through the existing resource table, comparing
5713 * it with the config table. This function will take care of old/new
5714 * devices and schedule adding/removing them from the mid-layer
5715 * as appropriate.
5716 *
5717 * Return value
5718 * None
5719 */
5720static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5721{
5722 struct pmcraid_instance *pinstance = cmd->drv_inst;
5723 struct pmcraid_resource_entry *res, *temp;
5724 struct pmcraid_config_table_entry *cfgte;
5725 unsigned long lock_flags;
5726 int found, rc, i;
5727 u16 fw_version;
5728 LIST_HEAD(old_res);
5729
5730 if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5731 pmcraid_err("IOA requires microcode download\n");
5732
5733 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5734
5735 /* resource list is protected by pinstance->resource_lock.
5736 * init_res_table can be called from probe (user-thread) or runtime
5737 * reset (timer/tasklet)
5738 */
5739 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5740
5741 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5742 list_move_tail(&res->queue, &old_res);
5743
5744 for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
5745 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5746 PMCRAID_FW_VERSION_1)
5747 cfgte = &pinstance->cfg_table->entries[i];
5748 else
5749 cfgte = (struct pmcraid_config_table_entry *)
5750 &pinstance->cfg_table->entries_ext[i];
5751
5752 if (!pmcraid_expose_resource(fw_version, cfgte))
5753 continue;
5754
5755 found = 0;
5756
5757 /* If this entry was already detected and initialized */
5758 list_for_each_entry_safe(res, temp, &old_res, queue) {
5759
5760 rc = memcmp(&res->cfg_entry.resource_address,
5761 &cfgte->resource_address,
5762 sizeof(cfgte->resource_address));
5763 if (!rc) {
5764 list_move_tail(&res->queue,
5765 &pinstance->used_res_q);
5766 found = 1;
5767 break;
5768 }
5769 }
5770
5771 /* If this is new entry, initialize it and add it the queue */
5772 if (!found) {
5773
5774 if (list_empty(&pinstance->free_res_q)) {
5775 pmcraid_err("Too many devices attached\n");
5776 break;
5777 }
5778
5779 found = 1;
5780 res = list_entry(pinstance->free_res_q.next,
5781 struct pmcraid_resource_entry, queue);
5782
5783 res->scsi_dev = NULL;
5784 res->change_detected = RES_CHANGE_ADD;
5785 res->reset_progress = 0;
5786 list_move_tail(&res->queue, &pinstance->used_res_q);
5787 }
5788
5789 /* copy new configuration table entry details into driver
5790 * maintained resource entry
5791 */
5792 if (found) {
5793 memcpy(&res->cfg_entry, cfgte,
5794 pinstance->config_table_entry_size);
5795 pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5796 res->cfg_entry.resource_type,
5797 (fw_version <= PMCRAID_FW_VERSION_1 ?
5798 res->cfg_entry.unique_flags1 :
5799 res->cfg_entry.array_id & 0xFF),
5800 le32_to_cpu(res->cfg_entry.resource_address));
5801 }
5802 }
5803
5804 /* Detect any deleted entries, mark them for deletion from mid-layer */
5805 list_for_each_entry_safe(res, temp, &old_res, queue) {
5806
5807 if (res->scsi_dev) {
5808 res->change_detected = RES_CHANGE_DEL;
5809 res->cfg_entry.resource_handle =
5810 PMCRAID_INVALID_RES_HANDLE;
5811 list_move_tail(&res->queue, &pinstance->used_res_q);
5812 } else {
5813 list_move_tail(&res->queue, &pinstance->free_res_q);
5814 }
5815 }
5816
5817 /* release the resource list lock */
5818 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5819 pmcraid_set_timestamp(cmd);
5820}
5821
5822/**
5823 * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5824 * @cmd: pointer pmcraid_cmd struct
5825 *
5826 * This function sends a Query IOA Configuration command to the adapter to
5827 * retrieve the IOA configuration table.
5828 *
5829 * Return value:
5830 * none
5831 */
5832static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5833{
5834 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5835 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5836 struct pmcraid_instance *pinstance = cmd->drv_inst;
5837 int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5838
5839 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5840 PMCRAID_FW_VERSION_1)
5841 pinstance->config_table_entry_size =
5842 sizeof(struct pmcraid_config_table_entry);
5843 else
5844 pinstance->config_table_entry_size =
5845 sizeof(struct pmcraid_config_table_entry_ext);
5846
5847 ioarcb->request_type = REQ_TYPE_IOACMD;
5848 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5849
5850 ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5851
5852 /* firmware requires 4-byte length field, specified in B.E format */
5853 memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5854
5855 /* Since entire config table can be described by single IOADL, it can
5856 * be part of IOARCB itself
5857 */
5858 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5859 offsetof(struct pmcraid_ioarcb,
5860 add_data.u.ioadl[0]));
5861 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5862 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5863
5864 ioarcb->request_flags0 |= NO_LINK_DESCS;
5865 ioarcb->data_transfer_length =
5866 cpu_to_le32(sizeof(struct pmcraid_config_table));
5867
5868 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5869 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5870 ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5871 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5872
5873 pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5874 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5875}
5876
5877
5878/**
5879 * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5880 * @pdev: pointer to pci device structure
5881 * @dev_id: pointer to device ids structure
5882 *
5883 * Return Value
5884 * returns 0 if the device is claimed and successfully configured.
5885 * returns non-zero error code in case of any failure
5886 */
5887static int __devinit pmcraid_probe(
5888 struct pci_dev *pdev,
5889 const struct pci_device_id *dev_id
5890)
5891{
5892 struct pmcraid_instance *pinstance;
5893 struct Scsi_Host *host;
5894 void __iomem *mapped_pci_addr;
5895 int rc = PCIBIOS_SUCCESSFUL;
5896
5897 if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5898 pmcraid_err
5899 ("maximum number(%d) of supported adapters reached\n",
5900 atomic_read(&pmcraid_adapter_count));
5901 return -ENOMEM;
5902 }
5903
5904 atomic_inc(&pmcraid_adapter_count);
5905 rc = pci_enable_device(pdev);
5906
5907 if (rc) {
5908 dev_err(&pdev->dev, "Cannot enable adapter\n");
5909 atomic_dec(&pmcraid_adapter_count);
5910 return rc;
5911 }
5912
5913 dev_info(&pdev->dev,
5914 "Found new IOA(%x:%x), Total IOA count: %d\n",
5915 pdev->vendor, pdev->device,
5916 atomic_read(&pmcraid_adapter_count));
5917
5918 rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5919
5920 if (rc < 0) {
5921 dev_err(&pdev->dev,
5922 "Couldn't register memory range of registers\n");
5923 goto out_disable_device;
5924 }
5925
5926 mapped_pci_addr = pci_iomap(pdev, 0, 0);
5927
5928 if (!mapped_pci_addr) {
5929 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5930 rc = -ENOMEM;
5931 goto out_release_regions;
5932 }
5933
5934 pci_set_master(pdev);
5935
5936 /* Firmware requires the system bus address of IOARCB to be within
5937 * 32-bit addressable range though it has 64-bit IOARRIN register.
5938 * However, firmware supports 64-bit streaming DMA buffers, whereas
5939 * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
5940 * returns memory within 4GB (if not, change this logic), coherent
5941 * buffers are within firmware acceptable address ranges.
5942 */
5943 if ((sizeof(dma_addr_t) == 4) ||
5944 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5945 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5946
5947 /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5948 * bit mask for pci_alloc_consistent to return addresses within 4GB
5949 */
5950 if (rc == 0)
5951 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5952
5953 if (rc != 0) {
5954 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5955 goto cleanup_nomem;
5956 }
5957
5958 host = scsi_host_alloc(&pmcraid_host_template,
5959 sizeof(struct pmcraid_instance));
5960
5961 if (!host) {
5962 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5963 rc = -ENOMEM;
5964 goto cleanup_nomem;
5965 }
5966
5967 host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5968 host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5969 host->unique_id = host->host_no;
5970 host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5971 host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5972
5973 /* zero out entire instance structure */
5974 pinstance = (struct pmcraid_instance *)host->hostdata;
5975 memset(pinstance, 0, sizeof(*pinstance));
5976
5977 pinstance->chip_cfg =
5978 (struct pmcraid_chip_details *)(dev_id->driver_data);
5979
5980 rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5981
5982 if (rc < 0) {
5983 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5984 goto out_scsi_host_put;
5985 }
5986
5987 pci_set_drvdata(pdev, pinstance);
5988
5989 /* Save PCI config-space for use following the reset */
5990 rc = pci_save_state(pinstance->pdev);
5991
5992 if (rc != 0) {
5993 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5994 goto out_scsi_host_put;
5995 }
5996
5997 pmcraid_disable_interrupts(pinstance, ~0);
5998
5999 rc = pmcraid_register_interrupt_handler(pinstance);
6000
6001 if (rc) {
6002 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
6003 goto out_scsi_host_put;
6004 }
6005
6006 pmcraid_init_tasklets(pinstance);
6007
6008 /* allocate verious buffers used by LLD.*/
6009 rc = pmcraid_init_buffers(pinstance);
6010
6011 if (rc) {
6012 pmcraid_err("couldn't allocate memory blocks\n");
6013 goto out_unregister_isr;
6014 }
6015
6016 /* check the reset type required */
6017 pmcraid_reset_type(pinstance);
6018
6019 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
6020
6021 /* Start IOA firmware initialization and bring card to Operational
6022 * state.
6023 */
6024 pmcraid_info("starting IOA initialization sequence\n");
6025 if (pmcraid_reset_bringup(pinstance)) {
6026 dev_err(&pdev->dev, "couldn't initialize IOA\n");
6027 rc = 1;
6028 goto out_release_bufs;
6029 }
6030
6031 /* Add adapter instance into mid-layer list */
6032 rc = scsi_add_host(pinstance->host, &pdev->dev);
6033 if (rc != 0) {
6034 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
6035 goto out_release_bufs;
6036 }
6037
6038 scsi_scan_host(pinstance->host);
6039
6040 rc = pmcraid_setup_chrdev(pinstance);
6041
6042 if (rc != 0) {
6043 pmcraid_err("couldn't create mgmt interface, error: %x\n",
6044 rc);
6045 goto out_remove_host;
6046 }
6047
6048 /* Schedule worker thread to handle CCN and take care of adding and
6049 * removing devices to OS
6050 */
6051 atomic_set(&pinstance->expose_resources, 1);
6052 schedule_work(&pinstance->worker_q);
6053 return rc;
6054
6055out_remove_host:
6056 scsi_remove_host(host);
6057
6058out_release_bufs:
6059 pmcraid_release_buffers(pinstance);
6060
6061out_unregister_isr:
6062 pmcraid_kill_tasklets(pinstance);
6063 pmcraid_unregister_interrupt_handler(pinstance);
6064
6065out_scsi_host_put:
6066 scsi_host_put(host);
6067
6068cleanup_nomem:
6069 iounmap(mapped_pci_addr);
6070
6071out_release_regions:
6072 pci_release_regions(pdev);
6073
6074out_disable_device:
6075 atomic_dec(&pmcraid_adapter_count);
6076 pci_set_drvdata(pdev, NULL);
6077 pci_disable_device(pdev);
6078 return -ENODEV;
6079}
6080
6081/*
6082 * PCI driver structure of pcmraid driver
6083 */
6084static struct pci_driver pmcraid_driver = {
6085 .name = PMCRAID_DRIVER_NAME,
6086 .id_table = pmcraid_pci_table,
6087 .probe = pmcraid_probe,
6088 .remove = pmcraid_remove,
6089 .suspend = pmcraid_suspend,
6090 .resume = pmcraid_resume,
6091 .shutdown = pmcraid_shutdown
6092};
6093
6094/**
6095 * pmcraid_init - module load entry point
6096 */
6097static int __init pmcraid_init(void)
6098{
6099 dev_t dev;
6100 int error;
6101
6102 pmcraid_info("%s Device Driver version: %s\n",
6103 PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
6104
6105 error = alloc_chrdev_region(&dev, 0,
6106 PMCRAID_MAX_ADAPTERS,
6107 PMCRAID_DEVFILE);
6108
6109 if (error) {
6110 pmcraid_err("failed to get a major number for adapters\n");
6111 goto out_init;
6112 }
6113
6114 pmcraid_major = MAJOR(dev);
6115 pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
6116
6117 if (IS_ERR(pmcraid_class)) {
6118 error = PTR_ERR(pmcraid_class);
6119 pmcraid_err("failed to register with with sysfs, error = %x\n",
6120 error);
6121 goto out_unreg_chrdev;
6122 }
6123
6124 error = pmcraid_netlink_init();
6125
6126 if (error)
6127 goto out_unreg_chrdev;
6128
6129 error = pci_register_driver(&pmcraid_driver);
6130
6131 if (error == 0)
6132 goto out_init;
6133
6134 pmcraid_err("failed to register pmcraid driver, error = %x\n",
6135 error);
6136 class_destroy(pmcraid_class);
6137 pmcraid_netlink_release();
6138
6139out_unreg_chrdev:
6140 unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
6141
6142out_init:
6143 return error;
6144}
6145
6146/**
6147 * pmcraid_exit - module unload entry point
6148 */
6149static void __exit pmcraid_exit(void)
6150{
6151 pmcraid_netlink_release();
6152 unregister_chrdev_region(MKDEV(pmcraid_major, 0),
6153 PMCRAID_MAX_ADAPTERS);
6154 pci_unregister_driver(&pmcraid_driver);
6155 class_destroy(pmcraid_class);
6156}
6157
6158module_init(pmcraid_init);
6159module_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);