1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Serial Attached SCSI (SAS) class SCSI Host glue.
4 *
5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 */
8
9 #include <linux/kthread.h>
10 #include <linux/firmware.h>
11 #include <linux/export.h>
12 #include <linux/ctype.h>
13 #include <linux/hex.h>
14 #include <linux/kernel.h>
15
16 #include "sas_internal.h"
17
18 #include <scsi/scsi_host.h>
19 #include <scsi/scsi_device.h>
20 #include <scsi/scsi_tcq.h>
21 #include <scsi/scsi.h>
22 #include <scsi/scsi_eh.h>
23 #include <scsi/scsi_transport.h>
24 #include <scsi/scsi_transport_sas.h>
25 #include <scsi/sas_ata.h>
26 #include "scsi_sas_internal.h"
27 #include "scsi_transport_api.h"
28 #include "scsi_priv.h"
29
30 #include <linux/err.h>
31 #include <linux/blkdev.h>
32 #include <linux/freezer.h>
33 #include <linux/gfp.h>
34 #include <linux/scatterlist.h>
35 #include <linux/libata.h>
36
37 /* record final status and free the task */
sas_end_task(struct scsi_cmnd * sc,struct sas_task * task)38 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
39 {
40 struct task_status_struct *ts = &task->task_status;
41 enum scsi_host_status hs = DID_OK;
42 enum exec_status stat = SAS_SAM_STAT_GOOD;
43
44 if (ts->resp == SAS_TASK_UNDELIVERED) {
45 /* transport error */
46 hs = DID_NO_CONNECT;
47 } else { /* ts->resp == SAS_TASK_COMPLETE */
48 /* task delivered, what happened afterwards? */
49 switch (ts->stat) {
50 case SAS_DEV_NO_RESPONSE:
51 case SAS_INTERRUPTED:
52 case SAS_PHY_DOWN:
53 case SAS_NAK_R_ERR:
54 case SAS_OPEN_TO:
55 hs = DID_NO_CONNECT;
56 break;
57 case SAS_DATA_UNDERRUN:
58 scsi_set_resid(sc, ts->residual);
59 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
60 hs = DID_ERROR;
61 break;
62 case SAS_DATA_OVERRUN:
63 hs = DID_ERROR;
64 break;
65 case SAS_QUEUE_FULL:
66 hs = DID_SOFT_ERROR; /* retry */
67 break;
68 case SAS_DEVICE_UNKNOWN:
69 hs = DID_BAD_TARGET;
70 break;
71 case SAS_OPEN_REJECT:
72 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
73 hs = DID_SOFT_ERROR; /* retry */
74 else
75 hs = DID_ERROR;
76 break;
77 case SAS_PROTO_RESPONSE:
78 pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP task; please report this\n",
79 task->dev->port->ha->sas_ha_name);
80 break;
81 case SAS_ABORTED_TASK:
82 hs = DID_ABORT;
83 break;
84 case SAS_SAM_STAT_CHECK_CONDITION:
85 memcpy(sc->sense_buffer, ts->buf,
86 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
87 stat = SAS_SAM_STAT_CHECK_CONDITION;
88 break;
89 default:
90 stat = ts->stat;
91 break;
92 }
93 }
94
95 sc->result = (hs << 16) | stat;
96 ASSIGN_SAS_TASK(sc, NULL);
97 sas_free_task(task);
98 }
99
sas_scsi_task_done(struct sas_task * task)100 static void sas_scsi_task_done(struct sas_task *task)
101 {
102 struct scsi_cmnd *sc = task->uldd_task;
103 struct domain_device *dev = task->dev;
104 struct sas_ha_struct *ha = dev->port->ha;
105 unsigned long flags;
106
107 spin_lock_irqsave(&dev->done_lock, flags);
108 if (test_bit(SAS_HA_FROZEN, &ha->state))
109 task = NULL;
110 else
111 ASSIGN_SAS_TASK(sc, NULL);
112 spin_unlock_irqrestore(&dev->done_lock, flags);
113
114 if (unlikely(!task)) {
115 /* task will be completed by the error handler */
116 pr_debug("task done but aborted\n");
117 return;
118 }
119
120 if (unlikely(!sc)) {
121 pr_debug("task_done called with non existing SCSI cmnd!\n");
122 sas_free_task(task);
123 return;
124 }
125
126 sas_end_task(sc, task);
127 scsi_done(sc);
128 }
129
sas_create_task(struct scsi_cmnd * cmd,struct domain_device * dev,gfp_t gfp_flags)130 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
131 struct domain_device *dev,
132 gfp_t gfp_flags)
133 {
134 struct sas_task *task = sas_alloc_task(gfp_flags);
135 struct scsi_lun lun;
136
137 if (!task)
138 return NULL;
139
140 task->uldd_task = cmd;
141 ASSIGN_SAS_TASK(cmd, task);
142
143 task->dev = dev;
144 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
145
146 int_to_scsilun(cmd->device->lun, &lun);
147 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
148 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
149 task->ssp_task.cmd = cmd;
150
151 task->scatter = scsi_sglist(cmd);
152 task->num_scatter = scsi_sg_count(cmd);
153 task->total_xfer_len = scsi_bufflen(cmd);
154 task->data_dir = cmd->sc_data_direction;
155
156 task->task_done = sas_scsi_task_done;
157
158 return task;
159 }
160
sas_queuecommand(struct Scsi_Host * host,struct scsi_cmnd * cmd)161 enum scsi_qc_status sas_queuecommand(struct Scsi_Host *host,
162 struct scsi_cmnd *cmd)
163 {
164 struct sas_internal *i = to_sas_internal(host->transportt);
165 struct domain_device *dev = cmd_to_domain_dev(cmd);
166 struct sas_task *task;
167 int res = 0;
168
169 /* If the device fell off, no sense in issuing commands */
170 if (test_bit(SAS_DEV_GONE, &dev->state)) {
171 cmd->result = DID_BAD_TARGET << 16;
172 goto out_done;
173 }
174
175 if (dev_is_sata(dev)) {
176 spin_lock_irq(dev->sata_dev.ap->lock);
177 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
178 spin_unlock_irq(dev->sata_dev.ap->lock);
179 return res;
180 }
181
182 task = sas_create_task(cmd, dev, GFP_ATOMIC);
183 if (!task)
184 return SCSI_MLQUEUE_HOST_BUSY;
185
186 res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
187 if (res)
188 goto out_free_task;
189 return 0;
190
191 out_free_task:
192 pr_debug("lldd_execute_task returned: %d\n", res);
193 ASSIGN_SAS_TASK(cmd, NULL);
194 sas_free_task(task);
195 if (res == -SAS_QUEUE_FULL)
196 cmd->result = DID_SOFT_ERROR << 16; /* retry */
197 else
198 cmd->result = DID_ERROR << 16;
199 out_done:
200 scsi_done(cmd);
201 return 0;
202 }
203 EXPORT_SYMBOL_GPL(sas_queuecommand);
204
sas_eh_finish_cmd(struct scsi_cmnd * cmd)205 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
206 {
207 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
208 struct domain_device *dev = cmd_to_domain_dev(cmd);
209 struct sas_task *task = TO_SAS_TASK(cmd);
210
211 /* At this point, we only get called following an actual abort
212 * of the task, so we should be guaranteed not to be racing with
213 * any completions from the LLD. Task is freed after this.
214 */
215 sas_end_task(cmd, task);
216
217 if (dev_is_sata(dev)) {
218 /* defer commands to libata so that libata EH can
219 * handle ata qcs correctly
220 */
221 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
222 return;
223 }
224
225 /* now finish the command and move it on to the error
226 * handler done list, this also takes it off the
227 * error handler pending list.
228 */
229 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
230 }
231
sas_scsi_clear_queue_lu(struct list_head * error_q,struct scsi_cmnd * my_cmd)232 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
233 {
234 struct scsi_cmnd *cmd, *n;
235
236 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
237 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
238 cmd->device->lun == my_cmd->device->lun)
239 sas_eh_finish_cmd(cmd);
240 }
241 }
242
sas_scsi_clear_queue_I_T(struct list_head * error_q,struct domain_device * dev)243 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
244 struct domain_device *dev)
245 {
246 struct scsi_cmnd *cmd, *n;
247
248 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
249 struct domain_device *x = cmd_to_domain_dev(cmd);
250
251 if (x == dev)
252 sas_eh_finish_cmd(cmd);
253 }
254 }
255
sas_scsi_clear_queue_port(struct list_head * error_q,struct asd_sas_port * port)256 static void sas_scsi_clear_queue_port(struct list_head *error_q,
257 struct asd_sas_port *port)
258 {
259 struct scsi_cmnd *cmd, *n;
260
261 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
262 struct domain_device *dev = cmd_to_domain_dev(cmd);
263 struct asd_sas_port *x = dev->port;
264
265 if (x == port)
266 sas_eh_finish_cmd(cmd);
267 }
268 }
269
270 enum task_disposition {
271 TASK_IS_DONE,
272 TASK_IS_ABORTED,
273 TASK_IS_AT_LU,
274 TASK_IS_NOT_AT_LU,
275 TASK_ABORT_FAILED,
276 };
277
sas_scsi_find_task(struct sas_task * task)278 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
279 {
280 unsigned long flags;
281 int i, res;
282 struct sas_internal *si =
283 to_sas_internal(task->dev->port->ha->shost->transportt);
284
285 for (i = 0; i < 5; i++) {
286 pr_notice("%s: aborting task 0x%p\n", __func__, task);
287 res = si->dft->lldd_abort_task(task);
288
289 spin_lock_irqsave(&task->task_state_lock, flags);
290 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
291 spin_unlock_irqrestore(&task->task_state_lock, flags);
292 pr_debug("%s: task 0x%p is done\n", __func__, task);
293 return TASK_IS_DONE;
294 }
295 spin_unlock_irqrestore(&task->task_state_lock, flags);
296
297 if (res == TMF_RESP_FUNC_COMPLETE) {
298 pr_notice("%s: task 0x%p is aborted\n",
299 __func__, task);
300 return TASK_IS_ABORTED;
301 } else if (si->dft->lldd_query_task) {
302 pr_notice("%s: querying task 0x%p\n", __func__, task);
303 res = si->dft->lldd_query_task(task);
304 switch (res) {
305 case TMF_RESP_FUNC_SUCC:
306 pr_notice("%s: task 0x%p at LU\n", __func__,
307 task);
308 return TASK_IS_AT_LU;
309 case TMF_RESP_FUNC_COMPLETE:
310 pr_notice("%s: task 0x%p not at LU\n",
311 __func__, task);
312 return TASK_IS_NOT_AT_LU;
313 case TMF_RESP_FUNC_FAILED:
314 pr_notice("%s: task 0x%p failed to abort\n",
315 __func__, task);
316 return TASK_ABORT_FAILED;
317 default:
318 pr_notice("%s: task 0x%p result code %d not handled\n",
319 __func__, task, res);
320 }
321 }
322 }
323 return TASK_ABORT_FAILED;
324 }
325
sas_recover_lu(struct domain_device * dev,struct scsi_cmnd * cmd)326 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
327 {
328 int res = TMF_RESP_FUNC_FAILED;
329 struct scsi_lun lun;
330 struct sas_internal *i =
331 to_sas_internal(dev->port->ha->shost->transportt);
332
333 int_to_scsilun(cmd->device->lun, &lun);
334
335 pr_notice("eh: device %016llx LUN 0x%llx has the task\n",
336 SAS_ADDR(dev->sas_addr),
337 cmd->device->lun);
338
339 if (i->dft->lldd_abort_task_set)
340 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
341
342 if (res == TMF_RESP_FUNC_FAILED) {
343 if (i->dft->lldd_clear_task_set)
344 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
345 }
346
347 if (res == TMF_RESP_FUNC_FAILED) {
348 if (i->dft->lldd_lu_reset)
349 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
350 }
351
352 return res;
353 }
354
sas_recover_I_T(struct domain_device * dev)355 static int sas_recover_I_T(struct domain_device *dev)
356 {
357 int res = TMF_RESP_FUNC_FAILED;
358 struct sas_internal *i =
359 to_sas_internal(dev->port->ha->shost->transportt);
360
361 pr_notice("I_T nexus reset for dev %016llx\n",
362 SAS_ADDR(dev->sas_addr));
363
364 if (i->dft->lldd_I_T_nexus_reset)
365 res = i->dft->lldd_I_T_nexus_reset(dev);
366
367 return res;
368 }
369
370 /* take a reference on the last known good phy for this device */
sas_get_local_phy(struct domain_device * dev)371 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
372 {
373 struct sas_ha_struct *ha = dev->port->ha;
374 struct sas_phy *phy;
375 unsigned long flags;
376
377 /* a published domain device always has a valid phy, it may be
378 * stale, but it is never NULL
379 */
380 BUG_ON(!dev->phy);
381
382 spin_lock_irqsave(&ha->phy_port_lock, flags);
383 phy = dev->phy;
384 get_device(&phy->dev);
385 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
386
387 return phy;
388 }
389 EXPORT_SYMBOL_GPL(sas_get_local_phy);
390
sas_queue_reset(struct domain_device * dev,int reset_type,u64 lun)391 static int sas_queue_reset(struct domain_device *dev, int reset_type, u64 lun)
392 {
393 struct sas_ha_struct *ha = dev->port->ha;
394 int scheduled = 0, tries = 100;
395
396 /* ata: promote lun reset to bus reset */
397 if (dev_is_sata(dev)) {
398 sas_ata_schedule_reset(dev);
399 return SUCCESS;
400 }
401
402 while (!scheduled && tries--) {
403 spin_lock_irq(&ha->lock);
404 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
405 !test_bit(reset_type, &dev->state)) {
406 scheduled = 1;
407 ha->eh_active++;
408 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
409 set_bit(SAS_DEV_EH_PENDING, &dev->state);
410 set_bit(reset_type, &dev->state);
411 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
412 scsi_schedule_eh(ha->shost);
413 }
414 spin_unlock_irq(&ha->lock);
415
416 if (scheduled)
417 return SUCCESS;
418 }
419
420 pr_warn("%s reset of %s failed\n",
421 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
422 dev_name(&dev->rphy->dev));
423
424 return FAILED;
425 }
426
sas_eh_abort_handler(struct scsi_cmnd * cmd)427 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
428 {
429 int res = TMF_RESP_FUNC_FAILED;
430 struct sas_task *task = TO_SAS_TASK(cmd);
431 struct Scsi_Host *host = cmd->device->host;
432 struct domain_device *dev = cmd_to_domain_dev(cmd);
433 struct sas_internal *i = to_sas_internal(host->transportt);
434 unsigned long flags;
435
436 if (!i->dft->lldd_abort_task)
437 return FAILED;
438
439 spin_lock_irqsave(host->host_lock, flags);
440 /* We cannot do async aborts for SATA devices */
441 if (dev_is_sata(dev) && !host->host_eh_scheduled) {
442 spin_unlock_irqrestore(host->host_lock, flags);
443 return FAILED;
444 }
445 spin_unlock_irqrestore(host->host_lock, flags);
446
447 if (task)
448 res = i->dft->lldd_abort_task(task);
449 else
450 pr_notice("no task to abort\n");
451 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
452 return SUCCESS;
453
454 return FAILED;
455 }
456 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
457
458 /* Attempt to send a LUN reset message to a device */
sas_eh_device_reset_handler(struct scsi_cmnd * cmd)459 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
460 {
461 int res;
462 struct scsi_lun lun;
463 struct Scsi_Host *host = cmd->device->host;
464 struct domain_device *dev = cmd_to_domain_dev(cmd);
465 struct sas_internal *i = to_sas_internal(host->transportt);
466
467 if (current != host->ehandler)
468 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun);
469
470 int_to_scsilun(cmd->device->lun, &lun);
471
472 if (!i->dft->lldd_lu_reset)
473 return FAILED;
474
475 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
476 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
477 return SUCCESS;
478
479 return FAILED;
480 }
481 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
482
sas_eh_target_reset_handler(struct scsi_cmnd * cmd)483 int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
484 {
485 int res;
486 struct Scsi_Host *host = cmd->device->host;
487 struct domain_device *dev = cmd_to_domain_dev(cmd);
488 struct sas_internal *i = to_sas_internal(host->transportt);
489
490 if (current != host->ehandler)
491 return sas_queue_reset(dev, SAS_DEV_RESET, 0);
492
493 if (!i->dft->lldd_I_T_nexus_reset)
494 return FAILED;
495
496 res = i->dft->lldd_I_T_nexus_reset(dev);
497 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
498 res == -ENODEV)
499 return SUCCESS;
500
501 return FAILED;
502 }
503 EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
504
505 /*
506 * Handle deferred QCs in case of a command timeout.
507 * See ata_scsi_eh_timed_out() for details.
508 */
sas_eh_timed_out(struct scsi_cmnd * cmd)509 enum scsi_timeout_action sas_eh_timed_out(struct scsi_cmnd *cmd)
510 {
511 struct domain_device *dev = cmd_to_domain_dev(cmd);
512
513 if (dev_is_sata(dev))
514 return ata_scsi_retry_deferred_qc(dev->sata_dev.ap, cmd);
515
516 return SCSI_EH_NOT_HANDLED;
517 }
518 EXPORT_SYMBOL_GPL(sas_eh_timed_out);
519
520 /* Try to reset a device */
try_to_reset_cmd_device(struct scsi_cmnd * cmd)521 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
522 {
523 int res;
524 struct Scsi_Host *shost = cmd->device->host;
525
526 if (!shost->hostt->eh_device_reset_handler)
527 goto try_target_reset;
528
529 res = shost->hostt->eh_device_reset_handler(cmd);
530 if (res == SUCCESS)
531 return res;
532
533 try_target_reset:
534 if (shost->hostt->eh_target_reset_handler)
535 return shost->hostt->eh_target_reset_handler(cmd);
536
537 return FAILED;
538 }
539
sas_eh_handle_sas_errors(struct Scsi_Host * shost,struct list_head * work_q)540 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
541 {
542 struct scsi_cmnd *cmd, *n;
543 enum task_disposition res = TASK_IS_DONE;
544 int tmf_resp, need_reset;
545 struct sas_internal *i = to_sas_internal(shost->transportt);
546 unsigned long flags;
547 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
548 LIST_HEAD(done);
549
550 /* clean out any commands that won the completion vs eh race */
551 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
552 struct domain_device *dev = cmd_to_domain_dev(cmd);
553 struct sas_task *task;
554
555 spin_lock_irqsave(&dev->done_lock, flags);
556 /* by this point the lldd has either observed
557 * SAS_HA_FROZEN and is leaving the task alone, or has
558 * won the race with eh and decided to complete it
559 */
560 task = TO_SAS_TASK(cmd);
561 spin_unlock_irqrestore(&dev->done_lock, flags);
562
563 if (!task)
564 list_move_tail(&cmd->eh_entry, &done);
565 }
566
567 Again:
568 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
569 struct sas_task *task = TO_SAS_TASK(cmd);
570
571 list_del_init(&cmd->eh_entry);
572
573 spin_lock_irqsave(&task->task_state_lock, flags);
574 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
575 spin_unlock_irqrestore(&task->task_state_lock, flags);
576
577 if (need_reset) {
578 pr_notice("%s: task 0x%p requests reset\n",
579 __func__, task);
580 goto reset;
581 }
582
583 pr_debug("trying to find task 0x%p\n", task);
584 res = sas_scsi_find_task(task);
585
586 switch (res) {
587 case TASK_IS_DONE:
588 pr_notice("%s: task 0x%p is done\n", __func__,
589 task);
590 sas_eh_finish_cmd(cmd);
591 continue;
592 case TASK_IS_ABORTED:
593 pr_notice("%s: task 0x%p is aborted\n",
594 __func__, task);
595 sas_eh_finish_cmd(cmd);
596 continue;
597 case TASK_IS_AT_LU:
598 pr_info("task 0x%p is at LU: lu recover\n", task);
599 reset:
600 tmf_resp = sas_recover_lu(task->dev, cmd);
601 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
602 pr_notice("dev %016llx LU 0x%llx is recovered\n",
603 SAS_ADDR(task->dev),
604 cmd->device->lun);
605 sas_eh_finish_cmd(cmd);
606 sas_scsi_clear_queue_lu(work_q, cmd);
607 goto Again;
608 }
609 fallthrough;
610 case TASK_IS_NOT_AT_LU:
611 case TASK_ABORT_FAILED:
612 pr_notice("task 0x%p is not at LU: I_T recover\n",
613 task);
614 tmf_resp = sas_recover_I_T(task->dev);
615 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
616 tmf_resp == -ENODEV) {
617 struct domain_device *dev = task->dev;
618 pr_notice("I_T %016llx recovered\n",
619 SAS_ADDR(task->dev->sas_addr));
620 sas_eh_finish_cmd(cmd);
621 sas_scsi_clear_queue_I_T(work_q, dev);
622 goto Again;
623 }
624 /* Hammer time :-) */
625 try_to_reset_cmd_device(cmd);
626 if (i->dft->lldd_clear_nexus_port) {
627 struct asd_sas_port *port = task->dev->port;
628 pr_debug("clearing nexus for port:%d\n",
629 port->id);
630 res = i->dft->lldd_clear_nexus_port(port);
631 if (res == TMF_RESP_FUNC_COMPLETE) {
632 pr_notice("clear nexus port:%d succeeded\n",
633 port->id);
634 sas_eh_finish_cmd(cmd);
635 sas_scsi_clear_queue_port(work_q,
636 port);
637 goto Again;
638 }
639 }
640 if (i->dft->lldd_clear_nexus_ha) {
641 pr_debug("clear nexus ha\n");
642 res = i->dft->lldd_clear_nexus_ha(ha);
643 if (res == TMF_RESP_FUNC_COMPLETE) {
644 pr_notice("clear nexus ha succeeded\n");
645 sas_eh_finish_cmd(cmd);
646 goto clear_q;
647 }
648 }
649 /* If we are here -- this means that no amount
650 * of effort could recover from errors. Quite
651 * possibly the HA just disappeared.
652 */
653 pr_err("error from device %016llx, LUN 0x%llx couldn't be recovered in any way\n",
654 SAS_ADDR(task->dev->sas_addr),
655 cmd->device->lun);
656
657 sas_eh_finish_cmd(cmd);
658 goto clear_q;
659 }
660 }
661 out:
662 list_splice_tail(&done, work_q);
663 list_splice_tail_init(&ha->eh_ata_q, work_q);
664 return;
665
666 clear_q:
667 pr_debug("--- Exit %s -- clear_q\n", __func__);
668 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
669 sas_eh_finish_cmd(cmd);
670 goto out;
671 }
672
sas_eh_handle_resets(struct Scsi_Host * shost)673 static void sas_eh_handle_resets(struct Scsi_Host *shost)
674 {
675 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
676 struct sas_internal *i = to_sas_internal(shost->transportt);
677
678 /* handle directed resets to sas devices */
679 spin_lock_irq(&ha->lock);
680 while (!list_empty(&ha->eh_dev_q)) {
681 struct domain_device *dev;
682 struct ssp_device *ssp;
683
684 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
685 list_del_init(&ssp->eh_list_node);
686 dev = container_of(ssp, typeof(*dev), ssp_dev);
687 kref_get(&dev->kref);
688 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
689
690 spin_unlock_irq(&ha->lock);
691
692 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
693 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
694
695 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
696 i->dft->lldd_I_T_nexus_reset(dev);
697
698 sas_put_device(dev);
699 spin_lock_irq(&ha->lock);
700 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
701 ha->eh_active--;
702 }
703 spin_unlock_irq(&ha->lock);
704 }
705
706
sas_scsi_recover_host(struct Scsi_Host * shost)707 void sas_scsi_recover_host(struct Scsi_Host *shost)
708 {
709 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
710 LIST_HEAD(eh_work_q);
711 int tries = 0;
712 bool retry;
713
714 retry:
715 tries++;
716 retry = true;
717 spin_lock_irq(shost->host_lock);
718 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
719 spin_unlock_irq(shost->host_lock);
720
721 pr_notice("Enter %s busy: %d failed: %d\n",
722 __func__, scsi_host_busy(shost), shost->host_failed);
723 /*
724 * Deal with commands that still have SAS tasks (i.e. they didn't
725 * complete via the normal sas_task completion mechanism),
726 * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
727 */
728 set_bit(SAS_HA_FROZEN, &ha->state);
729 sas_eh_handle_sas_errors(shost, &eh_work_q);
730 clear_bit(SAS_HA_FROZEN, &ha->state);
731 if (list_empty(&eh_work_q))
732 goto out;
733
734 /*
735 * Now deal with SCSI commands that completed ok but have a an error
736 * code (and hopefully sense data) attached. This is roughly what
737 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
738 * command we see here has no sas_task and is thus unknown to the HA.
739 */
740 sas_ata_eh(shost, &eh_work_q);
741 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
742 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
743
744 out:
745 sas_eh_handle_resets(shost);
746
747 /* now link into libata eh --- if we have any ata devices */
748 sas_ata_strategy_handler(shost);
749
750 scsi_eh_flush_done_q(&ha->eh_done_q);
751
752 /* check if any new eh work was scheduled during the last run */
753 spin_lock_irq(&ha->lock);
754 if (ha->eh_active == 0) {
755 shost->host_eh_scheduled = 0;
756 retry = false;
757 }
758 spin_unlock_irq(&ha->lock);
759
760 if (retry)
761 goto retry;
762
763 pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n",
764 __func__, scsi_host_busy(shost),
765 shost->host_failed, tries);
766 }
767
sas_ioctl(struct scsi_device * sdev,unsigned int cmd,void __user * arg)768 int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
769 {
770 struct domain_device *dev = sdev_to_domain_dev(sdev);
771
772 if (dev_is_sata(dev))
773 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
774
775 return -EINVAL;
776 }
777 EXPORT_SYMBOL_GPL(sas_ioctl);
778
sas_find_dev_by_rphy(struct sas_rphy * rphy)779 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
780 {
781 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
782 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
783 struct domain_device *found_dev = NULL;
784 int i;
785 unsigned long flags;
786
787 spin_lock_irqsave(&ha->phy_port_lock, flags);
788 for (i = 0; i < ha->num_phys; i++) {
789 struct asd_sas_port *port = ha->sas_port[i];
790 struct domain_device *dev;
791
792 spin_lock(&port->dev_list_lock);
793 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
794 if (rphy == dev->rphy) {
795 found_dev = dev;
796 spin_unlock(&port->dev_list_lock);
797 goto found;
798 }
799 }
800 spin_unlock(&port->dev_list_lock);
801 }
802 found:
803 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
804
805 return found_dev;
806 }
807
sas_target_alloc(struct scsi_target * starget)808 int sas_target_alloc(struct scsi_target *starget)
809 {
810 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
811 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
812
813 if (!found_dev)
814 return -ENODEV;
815
816 kref_get(&found_dev->kref);
817 starget->hostdata = found_dev;
818 return 0;
819 }
820 EXPORT_SYMBOL_GPL(sas_target_alloc);
821
822 #define SAS_DEF_QD 256
823
sas_sdev_configure(struct scsi_device * scsi_dev,struct queue_limits * lim)824 int sas_sdev_configure(struct scsi_device *scsi_dev, struct queue_limits *lim)
825 {
826 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
827
828 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
829
830 if (dev_is_sata(dev)) {
831 ata_sas_sdev_configure(scsi_dev, lim, dev->sata_dev.ap);
832 return 0;
833 }
834
835 sas_read_port_mode_page(scsi_dev);
836
837 if (scsi_dev->tagged_supported) {
838 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
839 } else {
840 pr_notice("device %016llx, LUN 0x%llx doesn't support TCQ\n",
841 SAS_ADDR(dev->sas_addr), scsi_dev->lun);
842 scsi_change_queue_depth(scsi_dev, 1);
843 }
844
845 scsi_dev->allow_restart = 1;
846
847 return 0;
848 }
849 EXPORT_SYMBOL_GPL(sas_sdev_configure);
850
sas_change_queue_depth(struct scsi_device * sdev,int depth)851 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
852 {
853 struct domain_device *dev = sdev_to_domain_dev(sdev);
854
855 if (dev_is_sata(dev))
856 return ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
857
858 if (!sdev->tagged_supported)
859 depth = 1;
860 return scsi_change_queue_depth(sdev, depth);
861 }
862 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
863
sas_bios_param(struct scsi_device * scsi_dev,struct gendisk * unused,sector_t capacity,int * hsc)864 int sas_bios_param(struct scsi_device *scsi_dev,
865 struct gendisk *unused,
866 sector_t capacity, int *hsc)
867 {
868 hsc[0] = 255;
869 hsc[1] = 63;
870 sector_div(capacity, 255*63);
871 hsc[2] = capacity;
872
873 return 0;
874 }
875 EXPORT_SYMBOL_GPL(sas_bios_param);
876
sas_task_internal_done(struct sas_task * task)877 void sas_task_internal_done(struct sas_task *task)
878 {
879 timer_delete(&task->slow_task->timer);
880 complete(&task->slow_task->completion);
881 }
882
sas_task_internal_timedout(struct timer_list * t)883 void sas_task_internal_timedout(struct timer_list *t)
884 {
885 struct sas_task_slow *slow = timer_container_of(slow, t, timer);
886 struct sas_task *task = slow->task;
887 bool is_completed = true;
888 unsigned long flags;
889
890 spin_lock_irqsave(&task->task_state_lock, flags);
891 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
892 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
893 is_completed = false;
894 }
895 spin_unlock_irqrestore(&task->task_state_lock, flags);
896
897 if (!is_completed)
898 complete(&task->slow_task->completion);
899 }
900
901 #define TASK_TIMEOUT (20 * HZ)
902 #define TASK_RETRY 3
903
sas_execute_internal_abort(struct domain_device * device,enum sas_internal_abort type,u16 tag,unsigned int qid,void * data)904 static int sas_execute_internal_abort(struct domain_device *device,
905 enum sas_internal_abort type, u16 tag,
906 unsigned int qid, void *data)
907 {
908 struct sas_ha_struct *ha = device->port->ha;
909 struct sas_internal *i = to_sas_internal(ha->shost->transportt);
910 struct sas_task *task = NULL;
911 int res, retry;
912
913 for (retry = 0; retry < TASK_RETRY; retry++) {
914 task = sas_alloc_slow_task(GFP_KERNEL);
915 if (!task)
916 return -ENOMEM;
917
918 task->dev = device;
919 task->task_proto = SAS_PROTOCOL_INTERNAL_ABORT;
920 task->task_done = sas_task_internal_done;
921 task->slow_task->timer.function = sas_task_internal_timedout;
922 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
923 add_timer(&task->slow_task->timer);
924
925 task->abort_task.tag = tag;
926 task->abort_task.type = type;
927 task->abort_task.qid = qid;
928
929 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
930 if (res) {
931 timer_delete_sync(&task->slow_task->timer);
932 pr_err("Executing internal abort failed %016llx (%d)\n",
933 SAS_ADDR(device->sas_addr), res);
934 break;
935 }
936
937 wait_for_completion(&task->slow_task->completion);
938 res = TMF_RESP_FUNC_FAILED;
939
940 /* Even if the internal abort timed out, return direct. */
941 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
942 bool quit = true;
943
944 if (i->dft->lldd_abort_timeout)
945 quit = i->dft->lldd_abort_timeout(task, data);
946 else
947 pr_err("Internal abort: timeout %016llx\n",
948 SAS_ADDR(device->sas_addr));
949 res = -EIO;
950 if (quit)
951 break;
952 }
953
954 if (task->task_status.resp == SAS_TASK_COMPLETE &&
955 task->task_status.stat == SAS_SAM_STAT_GOOD) {
956 res = TMF_RESP_FUNC_COMPLETE;
957 break;
958 }
959
960 if (task->task_status.resp == SAS_TASK_COMPLETE &&
961 task->task_status.stat == TMF_RESP_FUNC_SUCC) {
962 res = TMF_RESP_FUNC_SUCC;
963 break;
964 }
965
966 pr_err("Internal abort: task to dev %016llx response: 0x%x status 0x%x\n",
967 SAS_ADDR(device->sas_addr), task->task_status.resp,
968 task->task_status.stat);
969 sas_free_task(task);
970 task = NULL;
971 }
972 BUG_ON(retry == TASK_RETRY && task != NULL);
973 sas_free_task(task);
974 return res;
975 }
976
sas_execute_internal_abort_single(struct domain_device * device,u16 tag,unsigned int qid,void * data)977 int sas_execute_internal_abort_single(struct domain_device *device, u16 tag,
978 unsigned int qid, void *data)
979 {
980 return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_SINGLE,
981 tag, qid, data);
982 }
983 EXPORT_SYMBOL_GPL(sas_execute_internal_abort_single);
984
sas_execute_internal_abort_dev(struct domain_device * device,unsigned int qid,void * data)985 int sas_execute_internal_abort_dev(struct domain_device *device,
986 unsigned int qid, void *data)
987 {
988 return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_DEV,
989 SCSI_NO_TAG, qid, data);
990 }
991 EXPORT_SYMBOL_GPL(sas_execute_internal_abort_dev);
992
sas_execute_tmf(struct domain_device * device,void * parameter,int para_len,int force_phy_id,struct sas_tmf_task * tmf)993 int sas_execute_tmf(struct domain_device *device, void *parameter,
994 int para_len, int force_phy_id,
995 struct sas_tmf_task *tmf)
996 {
997 struct sas_task *task;
998 struct sas_internal *i =
999 to_sas_internal(device->port->ha->shost->transportt);
1000 int res, retry;
1001
1002 for (retry = 0; retry < TASK_RETRY; retry++) {
1003 task = sas_alloc_slow_task(GFP_KERNEL);
1004 if (!task)
1005 return -ENOMEM;
1006
1007 task->dev = device;
1008 task->task_proto = device->tproto;
1009
1010 if (dev_is_sata(device)) {
1011 task->ata_task.device_control_reg_update = 1;
1012 if (force_phy_id >= 0) {
1013 task->ata_task.force_phy = true;
1014 task->ata_task.force_phy_id = force_phy_id;
1015 }
1016 memcpy(&task->ata_task.fis, parameter, para_len);
1017 } else {
1018 memcpy(&task->ssp_task, parameter, para_len);
1019 }
1020
1021 task->task_done = sas_task_internal_done;
1022 task->tmf = tmf;
1023
1024 task->slow_task->timer.function = sas_task_internal_timedout;
1025 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
1026 add_timer(&task->slow_task->timer);
1027
1028 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
1029 if (res) {
1030 timer_delete_sync(&task->slow_task->timer);
1031 pr_err("executing TMF task failed %016llx (%d)\n",
1032 SAS_ADDR(device->sas_addr), res);
1033 break;
1034 }
1035
1036 wait_for_completion(&task->slow_task->completion);
1037
1038 if (i->dft->lldd_tmf_exec_complete)
1039 i->dft->lldd_tmf_exec_complete(device);
1040
1041 res = TMF_RESP_FUNC_FAILED;
1042
1043 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
1044 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
1045 pr_err("TMF task timeout for %016llx and not done\n",
1046 SAS_ADDR(device->sas_addr));
1047 if (i->dft->lldd_tmf_aborted)
1048 i->dft->lldd_tmf_aborted(task);
1049 break;
1050 }
1051 pr_warn("TMF task timeout for %016llx and done\n",
1052 SAS_ADDR(device->sas_addr));
1053 }
1054
1055 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1056 task->task_status.stat == TMF_RESP_FUNC_COMPLETE) {
1057 res = TMF_RESP_FUNC_COMPLETE;
1058 break;
1059 }
1060
1061 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1062 task->task_status.stat == TMF_RESP_FUNC_SUCC) {
1063 res = TMF_RESP_FUNC_SUCC;
1064 break;
1065 }
1066
1067 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1068 task->task_status.stat == SAS_DATA_UNDERRUN) {
1069 /* no error, but return the number of bytes of
1070 * underrun
1071 */
1072 pr_warn("TMF task to dev %016llx resp: 0x%x sts 0x%x underrun\n",
1073 SAS_ADDR(device->sas_addr),
1074 task->task_status.resp,
1075 task->task_status.stat);
1076 res = task->task_status.residual;
1077 break;
1078 }
1079
1080 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1081 task->task_status.stat == SAS_DATA_OVERRUN) {
1082 pr_warn("TMF task blocked task error %016llx\n",
1083 SAS_ADDR(device->sas_addr));
1084 res = -EMSGSIZE;
1085 break;
1086 }
1087
1088 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1089 task->task_status.stat == SAS_OPEN_REJECT) {
1090 pr_warn("TMF task open reject failed %016llx\n",
1091 SAS_ADDR(device->sas_addr));
1092 res = -EIO;
1093 } else {
1094 pr_warn("TMF task to dev %016llx resp: 0x%x status 0x%x\n",
1095 SAS_ADDR(device->sas_addr),
1096 task->task_status.resp,
1097 task->task_status.stat);
1098 }
1099 sas_free_task(task);
1100 task = NULL;
1101 }
1102
1103 if (retry == TASK_RETRY)
1104 pr_warn("executing TMF for %016llx failed after %d attempts!\n",
1105 SAS_ADDR(device->sas_addr), TASK_RETRY);
1106 sas_free_task(task);
1107
1108 return res;
1109 }
1110
sas_execute_ssp_tmf(struct domain_device * device,u8 * lun,struct sas_tmf_task * tmf)1111 static int sas_execute_ssp_tmf(struct domain_device *device, u8 *lun,
1112 struct sas_tmf_task *tmf)
1113 {
1114 struct sas_ssp_task ssp_task;
1115
1116 if (!(device->tproto & SAS_PROTOCOL_SSP))
1117 return TMF_RESP_FUNC_ESUPP;
1118
1119 memcpy(ssp_task.LUN, lun, 8);
1120
1121 return sas_execute_tmf(device, &ssp_task, sizeof(ssp_task), -1, tmf);
1122 }
1123
sas_abort_task_set(struct domain_device * dev,u8 * lun)1124 int sas_abort_task_set(struct domain_device *dev, u8 *lun)
1125 {
1126 struct sas_tmf_task tmf_task = {
1127 .tmf = TMF_ABORT_TASK_SET,
1128 };
1129
1130 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1131 }
1132 EXPORT_SYMBOL_GPL(sas_abort_task_set);
1133
sas_clear_task_set(struct domain_device * dev,u8 * lun)1134 int sas_clear_task_set(struct domain_device *dev, u8 *lun)
1135 {
1136 struct sas_tmf_task tmf_task = {
1137 .tmf = TMF_CLEAR_TASK_SET,
1138 };
1139
1140 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1141 }
1142 EXPORT_SYMBOL_GPL(sas_clear_task_set);
1143
sas_lu_reset(struct domain_device * dev,u8 * lun)1144 int sas_lu_reset(struct domain_device *dev, u8 *lun)
1145 {
1146 struct sas_tmf_task tmf_task = {
1147 .tmf = TMF_LU_RESET,
1148 };
1149
1150 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1151 }
1152 EXPORT_SYMBOL_GPL(sas_lu_reset);
1153
sas_query_task(struct sas_task * task,u16 tag)1154 int sas_query_task(struct sas_task *task, u16 tag)
1155 {
1156 struct sas_tmf_task tmf_task = {
1157 .tmf = TMF_QUERY_TASK,
1158 .tag_of_task_to_be_managed = tag,
1159 };
1160 struct scsi_cmnd *cmnd = task->uldd_task;
1161 struct domain_device *dev = task->dev;
1162 struct scsi_lun lun;
1163
1164 int_to_scsilun(cmnd->device->lun, &lun);
1165
1166 return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1167 }
1168 EXPORT_SYMBOL_GPL(sas_query_task);
1169
sas_abort_task(struct sas_task * task,u16 tag)1170 int sas_abort_task(struct sas_task *task, u16 tag)
1171 {
1172 struct sas_tmf_task tmf_task = {
1173 .tmf = TMF_ABORT_TASK,
1174 .tag_of_task_to_be_managed = tag,
1175 };
1176 struct scsi_cmnd *cmnd = task->uldd_task;
1177 struct domain_device *dev = task->dev;
1178 struct scsi_lun lun;
1179
1180 int_to_scsilun(cmnd->device->lun, &lun);
1181
1182 return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1183 }
1184 EXPORT_SYMBOL_GPL(sas_abort_task);
1185
1186 /*
1187 * Tell an upper layer that it needs to initiate an abort for a given task.
1188 * This should only ever be called by an LLDD.
1189 */
sas_task_abort(struct sas_task * task)1190 void sas_task_abort(struct sas_task *task)
1191 {
1192 struct scsi_cmnd *sc = task->uldd_task;
1193
1194 /* Escape for libsas internal commands */
1195 if (!sc) {
1196 struct sas_task_slow *slow = task->slow_task;
1197
1198 if (!slow)
1199 return;
1200 if (!timer_delete(&slow->timer))
1201 return;
1202 slow->timer.function(&slow->timer);
1203 return;
1204 }
1205
1206 if (dev_is_sata(task->dev))
1207 sas_ata_task_abort(task);
1208 else
1209 blk_abort_request(scsi_cmd_to_rq(sc));
1210 }
1211 EXPORT_SYMBOL_GPL(sas_task_abort);
1212
sas_sdev_init(struct scsi_device * sdev)1213 int sas_sdev_init(struct scsi_device *sdev)
1214 {
1215 if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
1216 return -ENXIO;
1217
1218 return 0;
1219 }
1220 EXPORT_SYMBOL_GPL(sas_sdev_init);
1221
sas_target_destroy(struct scsi_target * starget)1222 void sas_target_destroy(struct scsi_target *starget)
1223 {
1224 struct domain_device *found_dev = starget->hostdata;
1225
1226 if (!found_dev)
1227 return;
1228
1229 starget->hostdata = NULL;
1230 sas_put_device(found_dev);
1231 }
1232 EXPORT_SYMBOL_GPL(sas_target_destroy);
1233
1234 #define SAS_STRING_ADDR_SIZE 16
1235
sas_request_addr(struct Scsi_Host * shost,u8 * addr)1236 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1237 {
1238 int res;
1239 const struct firmware *fw;
1240
1241 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1242 if (res)
1243 return res;
1244
1245 if (fw->size < SAS_STRING_ADDR_SIZE) {
1246 res = -ENODEV;
1247 goto out;
1248 }
1249
1250 res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
1251 if (res)
1252 goto out;
1253
1254 out:
1255 release_firmware(fw);
1256 return res;
1257 }
1258 EXPORT_SYMBOL_GPL(sas_request_addr);
1259
1260