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9#include <linux/kthread.h>
10#include <linux/firmware.h>
11#include <linux/export.h>
12#include <linux/ctype.h>
13#include <linux/kernel.h>
14
15#include "sas_internal.h"
16
17#include <scsi/scsi_host.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_tcq.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_eh.h>
22#include <scsi/scsi_transport.h>
23#include <scsi/scsi_transport_sas.h>
24#include <scsi/sas_ata.h>
25#include "scsi_sas_internal.h"
26#include "scsi_transport_api.h"
27#include "scsi_priv.h"
28
29#include <linux/err.h>
30#include <linux/blkdev.h>
31#include <linux/freezer.h>
32#include <linux/gfp.h>
33#include <linux/scatterlist.h>
34#include <linux/libata.h>
35
36
37static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
38{
39 struct task_status_struct *ts = &task->task_status;
40 int hs = 0, stat = 0;
41
42 if (ts->resp == SAS_TASK_UNDELIVERED) {
43
44 hs = DID_NO_CONNECT;
45 } else {
46
47 switch (ts->stat) {
48 case SAS_DEV_NO_RESPONSE:
49 case SAS_INTERRUPTED:
50 case SAS_PHY_DOWN:
51 case SAS_NAK_R_ERR:
52 case SAS_OPEN_TO:
53 hs = DID_NO_CONNECT;
54 break;
55 case SAS_DATA_UNDERRUN:
56 scsi_set_resid(sc, ts->residual);
57 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
58 hs = DID_ERROR;
59 break;
60 case SAS_DATA_OVERRUN:
61 hs = DID_ERROR;
62 break;
63 case SAS_QUEUE_FULL:
64 hs = DID_SOFT_ERROR;
65 break;
66 case SAS_DEVICE_UNKNOWN:
67 hs = DID_BAD_TARGET;
68 break;
69 case SAS_SG_ERR:
70 hs = DID_PARITY;
71 break;
72 case SAS_OPEN_REJECT:
73 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
74 hs = DID_SOFT_ERROR;
75 else
76 hs = DID_ERROR;
77 break;
78 case SAS_PROTO_RESPONSE:
79 pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP task; please report this\n",
80 task->dev->port->ha->sas_ha_name);
81 break;
82 case SAS_ABORTED_TASK:
83 hs = DID_ABORT;
84 break;
85 case SAM_STAT_CHECK_CONDITION:
86 memcpy(sc->sense_buffer, ts->buf,
87 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
88 stat = SAM_STAT_CHECK_CONDITION;
89 break;
90 default:
91 stat = ts->stat;
92 break;
93 }
94 }
95
96 sc->result = (hs << 16) | stat;
97 ASSIGN_SAS_TASK(sc, NULL);
98 sas_free_task(task);
99}
100
101static void sas_scsi_task_done(struct sas_task *task)
102{
103 struct scsi_cmnd *sc = task->uldd_task;
104 struct domain_device *dev = task->dev;
105 struct sas_ha_struct *ha = dev->port->ha;
106 unsigned long flags;
107
108 spin_lock_irqsave(&dev->done_lock, flags);
109 if (test_bit(SAS_HA_FROZEN, &ha->state))
110 task = NULL;
111 else
112 ASSIGN_SAS_TASK(sc, NULL);
113 spin_unlock_irqrestore(&dev->done_lock, flags);
114
115 if (unlikely(!task)) {
116
117 pr_debug("task done but aborted\n");
118 return;
119 }
120
121 if (unlikely(!sc)) {
122 pr_debug("task_done called with non existing SCSI cmnd!\n");
123 sas_free_task(task);
124 return;
125 }
126
127 sas_end_task(sc, task);
128 scsi_done(sc);
129}
130
131static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
132 struct domain_device *dev,
133 gfp_t gfp_flags)
134{
135 struct sas_task *task = sas_alloc_task(gfp_flags);
136 struct scsi_lun lun;
137
138 if (!task)
139 return NULL;
140
141 task->uldd_task = cmd;
142 ASSIGN_SAS_TASK(cmd, task);
143
144 task->dev = dev;
145 task->task_proto = task->dev->tproto;
146
147 task->ssp_task.retry_count = 1;
148 int_to_scsilun(cmd->device->lun, &lun);
149 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
150 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
151 task->ssp_task.cmd = cmd;
152
153 task->scatter = scsi_sglist(cmd);
154 task->num_scatter = scsi_sg_count(cmd);
155 task->total_xfer_len = scsi_bufflen(cmd);
156 task->data_dir = cmd->sc_data_direction;
157
158 task->task_done = sas_scsi_task_done;
159
160 return task;
161}
162
163int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
164{
165 struct sas_internal *i = to_sas_internal(host->transportt);
166 struct domain_device *dev = cmd_to_domain_dev(cmd);
167 struct sas_task *task;
168 int res = 0;
169
170
171 if (test_bit(SAS_DEV_GONE, &dev->state)) {
172 cmd->result = DID_BAD_TARGET << 16;
173 goto out_done;
174 }
175
176 if (dev_is_sata(dev)) {
177 spin_lock_irq(dev->sata_dev.ap->lock);
178 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
179 spin_unlock_irq(dev->sata_dev.ap->lock);
180 return res;
181 }
182
183 task = sas_create_task(cmd, dev, GFP_ATOMIC);
184 if (!task)
185 return SCSI_MLQUEUE_HOST_BUSY;
186
187 res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
188 if (res)
189 goto out_free_task;
190 return 0;
191
192out_free_task:
193 pr_debug("lldd_execute_task returned: %d\n", res);
194 ASSIGN_SAS_TASK(cmd, NULL);
195 sas_free_task(task);
196 if (res == -SAS_QUEUE_FULL)
197 cmd->result = DID_SOFT_ERROR << 16;
198 else
199 cmd->result = DID_ERROR << 16;
200out_done:
201 scsi_done(cmd);
202 return 0;
203}
204EXPORT_SYMBOL_GPL(sas_queuecommand);
205
206static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
207{
208 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
209 struct domain_device *dev = cmd_to_domain_dev(cmd);
210 struct sas_task *task = TO_SAS_TASK(cmd);
211
212
213
214
215
216 sas_end_task(cmd, task);
217
218 if (dev_is_sata(dev)) {
219
220
221
222 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
223 return;
224 }
225
226
227
228
229
230 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
231}
232
233static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
234{
235 struct scsi_cmnd *cmd, *n;
236
237 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
238 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
239 cmd->device->lun == my_cmd->device->lun)
240 sas_eh_finish_cmd(cmd);
241 }
242}
243
244static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
245 struct domain_device *dev)
246{
247 struct scsi_cmnd *cmd, *n;
248
249 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
250 struct domain_device *x = cmd_to_domain_dev(cmd);
251
252 if (x == dev)
253 sas_eh_finish_cmd(cmd);
254 }
255}
256
257static void sas_scsi_clear_queue_port(struct list_head *error_q,
258 struct asd_sas_port *port)
259{
260 struct scsi_cmnd *cmd, *n;
261
262 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
263 struct domain_device *dev = cmd_to_domain_dev(cmd);
264 struct asd_sas_port *x = dev->port;
265
266 if (x == port)
267 sas_eh_finish_cmd(cmd);
268 }
269}
270
271enum task_disposition {
272 TASK_IS_DONE,
273 TASK_IS_ABORTED,
274 TASK_IS_AT_LU,
275 TASK_IS_NOT_AT_LU,
276 TASK_ABORT_FAILED,
277};
278
279static enum task_disposition sas_scsi_find_task(struct sas_task *task)
280{
281 unsigned long flags;
282 int i, res;
283 struct sas_internal *si =
284 to_sas_internal(task->dev->port->ha->core.shost->transportt);
285
286 for (i = 0; i < 5; i++) {
287 pr_notice("%s: aborting task 0x%p\n", __func__, task);
288 res = si->dft->lldd_abort_task(task);
289
290 spin_lock_irqsave(&task->task_state_lock, flags);
291 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
292 spin_unlock_irqrestore(&task->task_state_lock, flags);
293 pr_debug("%s: task 0x%p is done\n", __func__, task);
294 return TASK_IS_DONE;
295 }
296 spin_unlock_irqrestore(&task->task_state_lock, flags);
297
298 if (res == TMF_RESP_FUNC_COMPLETE) {
299 pr_notice("%s: task 0x%p is aborted\n",
300 __func__, task);
301 return TASK_IS_ABORTED;
302 } else if (si->dft->lldd_query_task) {
303 pr_notice("%s: querying task 0x%p\n", __func__, task);
304 res = si->dft->lldd_query_task(task);
305 switch (res) {
306 case TMF_RESP_FUNC_SUCC:
307 pr_notice("%s: task 0x%p at LU\n", __func__,
308 task);
309 return TASK_IS_AT_LU;
310 case TMF_RESP_FUNC_COMPLETE:
311 pr_notice("%s: task 0x%p not at LU\n",
312 __func__, task);
313 return TASK_IS_NOT_AT_LU;
314 case TMF_RESP_FUNC_FAILED:
315 pr_notice("%s: task 0x%p failed to abort\n",
316 __func__, task);
317 return TASK_ABORT_FAILED;
318 }
319
320 }
321 }
322 return res;
323}
324
325static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
326{
327 int res = TMF_RESP_FUNC_FAILED;
328 struct scsi_lun lun;
329 struct sas_internal *i =
330 to_sas_internal(dev->port->ha->core.shost->transportt);
331
332 int_to_scsilun(cmd->device->lun, &lun);
333
334 pr_notice("eh: device %016llx LUN 0x%llx has the task\n",
335 SAS_ADDR(dev->sas_addr),
336 cmd->device->lun);
337
338 if (i->dft->lldd_abort_task_set)
339 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
340
341 if (res == TMF_RESP_FUNC_FAILED) {
342 if (i->dft->lldd_clear_task_set)
343 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
344 }
345
346 if (res == TMF_RESP_FUNC_FAILED) {
347 if (i->dft->lldd_lu_reset)
348 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
349 }
350
351 return res;
352}
353
354static int sas_recover_I_T(struct domain_device *dev)
355{
356 int res = TMF_RESP_FUNC_FAILED;
357 struct sas_internal *i =
358 to_sas_internal(dev->port->ha->core.shost->transportt);
359
360 pr_notice("I_T nexus reset for dev %016llx\n",
361 SAS_ADDR(dev->sas_addr));
362
363 if (i->dft->lldd_I_T_nexus_reset)
364 res = i->dft->lldd_I_T_nexus_reset(dev);
365
366 return res;
367}
368
369
370struct sas_phy *sas_get_local_phy(struct domain_device *dev)
371{
372 struct sas_ha_struct *ha = dev->port->ha;
373 struct sas_phy *phy;
374 unsigned long flags;
375
376
377
378
379 BUG_ON(!dev->phy);
380
381 spin_lock_irqsave(&ha->phy_port_lock, flags);
382 phy = dev->phy;
383 get_device(&phy->dev);
384 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
385
386 return phy;
387}
388EXPORT_SYMBOL_GPL(sas_get_local_phy);
389
390static void sas_wait_eh(struct domain_device *dev)
391{
392 struct sas_ha_struct *ha = dev->port->ha;
393 DEFINE_WAIT(wait);
394
395 if (dev_is_sata(dev)) {
396 ata_port_wait_eh(dev->sata_dev.ap);
397 return;
398 }
399 retry:
400 spin_lock_irq(&ha->lock);
401
402 while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
403 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
404 spin_unlock_irq(&ha->lock);
405 schedule();
406 spin_lock_irq(&ha->lock);
407 }
408 finish_wait(&ha->eh_wait_q, &wait);
409
410 spin_unlock_irq(&ha->lock);
411
412
413 if (scsi_host_in_recovery(ha->core.shost)) {
414 msleep(10);
415 goto retry;
416 }
417}
418
419static int sas_queue_reset(struct domain_device *dev, int reset_type,
420 u64 lun, int wait)
421{
422 struct sas_ha_struct *ha = dev->port->ha;
423 int scheduled = 0, tries = 100;
424
425
426 if (dev_is_sata(dev)) {
427 sas_ata_schedule_reset(dev);
428 if (wait)
429 sas_ata_wait_eh(dev);
430 return SUCCESS;
431 }
432
433 while (!scheduled && tries--) {
434 spin_lock_irq(&ha->lock);
435 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
436 !test_bit(reset_type, &dev->state)) {
437 scheduled = 1;
438 ha->eh_active++;
439 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
440 set_bit(SAS_DEV_EH_PENDING, &dev->state);
441 set_bit(reset_type, &dev->state);
442 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
443 scsi_schedule_eh(ha->core.shost);
444 }
445 spin_unlock_irq(&ha->lock);
446
447 if (wait)
448 sas_wait_eh(dev);
449
450 if (scheduled)
451 return SUCCESS;
452 }
453
454 pr_warn("%s reset of %s failed\n",
455 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
456 dev_name(&dev->rphy->dev));
457
458 return FAILED;
459}
460
461int sas_eh_abort_handler(struct scsi_cmnd *cmd)
462{
463 int res = TMF_RESP_FUNC_FAILED;
464 struct sas_task *task = TO_SAS_TASK(cmd);
465 struct Scsi_Host *host = cmd->device->host;
466 struct domain_device *dev = cmd_to_domain_dev(cmd);
467 struct sas_internal *i = to_sas_internal(host->transportt);
468 unsigned long flags;
469
470 if (!i->dft->lldd_abort_task)
471 return FAILED;
472
473 spin_lock_irqsave(host->host_lock, flags);
474
475 if (dev_is_sata(dev) && !host->host_eh_scheduled) {
476 spin_unlock_irqrestore(host->host_lock, flags);
477 return FAILED;
478 }
479 spin_unlock_irqrestore(host->host_lock, flags);
480
481 if (task)
482 res = i->dft->lldd_abort_task(task);
483 else
484 pr_notice("no task to abort\n");
485 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
486 return SUCCESS;
487
488 return FAILED;
489}
490EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
491
492
493int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
494{
495 int res;
496 struct scsi_lun lun;
497 struct Scsi_Host *host = cmd->device->host;
498 struct domain_device *dev = cmd_to_domain_dev(cmd);
499 struct sas_internal *i = to_sas_internal(host->transportt);
500
501 if (current != host->ehandler)
502 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
503
504 int_to_scsilun(cmd->device->lun, &lun);
505
506 if (!i->dft->lldd_lu_reset)
507 return FAILED;
508
509 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
510 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
511 return SUCCESS;
512
513 return FAILED;
514}
515EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
516
517int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
518{
519 int res;
520 struct Scsi_Host *host = cmd->device->host;
521 struct domain_device *dev = cmd_to_domain_dev(cmd);
522 struct sas_internal *i = to_sas_internal(host->transportt);
523
524 if (current != host->ehandler)
525 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
526
527 if (!i->dft->lldd_I_T_nexus_reset)
528 return FAILED;
529
530 res = i->dft->lldd_I_T_nexus_reset(dev);
531 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
532 res == -ENODEV)
533 return SUCCESS;
534
535 return FAILED;
536}
537EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
538
539
540static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
541{
542 int res;
543 struct Scsi_Host *shost = cmd->device->host;
544
545 if (!shost->hostt->eh_device_reset_handler)
546 goto try_target_reset;
547
548 res = shost->hostt->eh_device_reset_handler(cmd);
549 if (res == SUCCESS)
550 return res;
551
552try_target_reset:
553 if (shost->hostt->eh_target_reset_handler)
554 return shost->hostt->eh_target_reset_handler(cmd);
555
556 return FAILED;
557}
558
559static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
560{
561 struct scsi_cmnd *cmd, *n;
562 enum task_disposition res = TASK_IS_DONE;
563 int tmf_resp, need_reset;
564 struct sas_internal *i = to_sas_internal(shost->transportt);
565 unsigned long flags;
566 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
567 LIST_HEAD(done);
568
569
570 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
571 struct domain_device *dev = cmd_to_domain_dev(cmd);
572 struct sas_task *task;
573
574 spin_lock_irqsave(&dev->done_lock, flags);
575
576
577
578
579 task = TO_SAS_TASK(cmd);
580 spin_unlock_irqrestore(&dev->done_lock, flags);
581
582 if (!task)
583 list_move_tail(&cmd->eh_entry, &done);
584 }
585
586 Again:
587 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
588 struct sas_task *task = TO_SAS_TASK(cmd);
589
590 list_del_init(&cmd->eh_entry);
591
592 spin_lock_irqsave(&task->task_state_lock, flags);
593 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
594 spin_unlock_irqrestore(&task->task_state_lock, flags);
595
596 if (need_reset) {
597 pr_notice("%s: task 0x%p requests reset\n",
598 __func__, task);
599 goto reset;
600 }
601
602 pr_debug("trying to find task 0x%p\n", task);
603 res = sas_scsi_find_task(task);
604
605 switch (res) {
606 case TASK_IS_DONE:
607 pr_notice("%s: task 0x%p is done\n", __func__,
608 task);
609 sas_eh_finish_cmd(cmd);
610 continue;
611 case TASK_IS_ABORTED:
612 pr_notice("%s: task 0x%p is aborted\n",
613 __func__, task);
614 sas_eh_finish_cmd(cmd);
615 continue;
616 case TASK_IS_AT_LU:
617 pr_info("task 0x%p is at LU: lu recover\n", task);
618 reset:
619 tmf_resp = sas_recover_lu(task->dev, cmd);
620 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
621 pr_notice("dev %016llx LU 0x%llx is recovered\n",
622 SAS_ADDR(task->dev),
623 cmd->device->lun);
624 sas_eh_finish_cmd(cmd);
625 sas_scsi_clear_queue_lu(work_q, cmd);
626 goto Again;
627 }
628 fallthrough;
629 case TASK_IS_NOT_AT_LU:
630 case TASK_ABORT_FAILED:
631 pr_notice("task 0x%p is not at LU: I_T recover\n",
632 task);
633 tmf_resp = sas_recover_I_T(task->dev);
634 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
635 tmf_resp == -ENODEV) {
636 struct domain_device *dev = task->dev;
637 pr_notice("I_T %016llx recovered\n",
638 SAS_ADDR(task->dev->sas_addr));
639 sas_eh_finish_cmd(cmd);
640 sas_scsi_clear_queue_I_T(work_q, dev);
641 goto Again;
642 }
643
644 try_to_reset_cmd_device(cmd);
645 if (i->dft->lldd_clear_nexus_port) {
646 struct asd_sas_port *port = task->dev->port;
647 pr_debug("clearing nexus for port:%d\n",
648 port->id);
649 res = i->dft->lldd_clear_nexus_port(port);
650 if (res == TMF_RESP_FUNC_COMPLETE) {
651 pr_notice("clear nexus port:%d succeeded\n",
652 port->id);
653 sas_eh_finish_cmd(cmd);
654 sas_scsi_clear_queue_port(work_q,
655 port);
656 goto Again;
657 }
658 }
659 if (i->dft->lldd_clear_nexus_ha) {
660 pr_debug("clear nexus ha\n");
661 res = i->dft->lldd_clear_nexus_ha(ha);
662 if (res == TMF_RESP_FUNC_COMPLETE) {
663 pr_notice("clear nexus ha succeeded\n");
664 sas_eh_finish_cmd(cmd);
665 goto clear_q;
666 }
667 }
668
669
670
671
672 pr_err("error from device %016llx, LUN 0x%llx couldn't be recovered in any way\n",
673 SAS_ADDR(task->dev->sas_addr),
674 cmd->device->lun);
675
676 sas_eh_finish_cmd(cmd);
677 goto clear_q;
678 }
679 }
680 out:
681 list_splice_tail(&done, work_q);
682 list_splice_tail_init(&ha->eh_ata_q, work_q);
683 return;
684
685 clear_q:
686 pr_debug("--- Exit %s -- clear_q\n", __func__);
687 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
688 sas_eh_finish_cmd(cmd);
689 goto out;
690}
691
692static void sas_eh_handle_resets(struct Scsi_Host *shost)
693{
694 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
695 struct sas_internal *i = to_sas_internal(shost->transportt);
696
697
698 spin_lock_irq(&ha->lock);
699 while (!list_empty(&ha->eh_dev_q)) {
700 struct domain_device *dev;
701 struct ssp_device *ssp;
702
703 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
704 list_del_init(&ssp->eh_list_node);
705 dev = container_of(ssp, typeof(*dev), ssp_dev);
706 kref_get(&dev->kref);
707 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
708
709 spin_unlock_irq(&ha->lock);
710
711 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
712 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
713
714 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
715 i->dft->lldd_I_T_nexus_reset(dev);
716
717 sas_put_device(dev);
718 spin_lock_irq(&ha->lock);
719 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
720 ha->eh_active--;
721 }
722 spin_unlock_irq(&ha->lock);
723}
724
725
726void sas_scsi_recover_host(struct Scsi_Host *shost)
727{
728 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
729 LIST_HEAD(eh_work_q);
730 int tries = 0;
731 bool retry;
732
733retry:
734 tries++;
735 retry = true;
736 spin_lock_irq(shost->host_lock);
737 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
738 spin_unlock_irq(shost->host_lock);
739
740 pr_notice("Enter %s busy: %d failed: %d\n",
741 __func__, scsi_host_busy(shost), shost->host_failed);
742
743
744
745
746
747 set_bit(SAS_HA_FROZEN, &ha->state);
748 sas_eh_handle_sas_errors(shost, &eh_work_q);
749 clear_bit(SAS_HA_FROZEN, &ha->state);
750 if (list_empty(&eh_work_q))
751 goto out;
752
753
754
755
756
757
758
759 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
760 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
761 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
762
763out:
764 sas_eh_handle_resets(shost);
765
766
767 sas_ata_strategy_handler(shost);
768
769 scsi_eh_flush_done_q(&ha->eh_done_q);
770
771
772 spin_lock_irq(&ha->lock);
773 if (ha->eh_active == 0) {
774 shost->host_eh_scheduled = 0;
775 retry = false;
776 }
777 spin_unlock_irq(&ha->lock);
778
779 if (retry)
780 goto retry;
781
782 pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n",
783 __func__, scsi_host_busy(shost),
784 shost->host_failed, tries);
785}
786
787int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
788{
789 struct domain_device *dev = sdev_to_domain_dev(sdev);
790
791 if (dev_is_sata(dev))
792 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
793
794 return -EINVAL;
795}
796EXPORT_SYMBOL_GPL(sas_ioctl);
797
798struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
799{
800 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
801 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
802 struct domain_device *found_dev = NULL;
803 int i;
804 unsigned long flags;
805
806 spin_lock_irqsave(&ha->phy_port_lock, flags);
807 for (i = 0; i < ha->num_phys; i++) {
808 struct asd_sas_port *port = ha->sas_port[i];
809 struct domain_device *dev;
810
811 spin_lock(&port->dev_list_lock);
812 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
813 if (rphy == dev->rphy) {
814 found_dev = dev;
815 spin_unlock(&port->dev_list_lock);
816 goto found;
817 }
818 }
819 spin_unlock(&port->dev_list_lock);
820 }
821 found:
822 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
823
824 return found_dev;
825}
826
827int sas_target_alloc(struct scsi_target *starget)
828{
829 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
830 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
831
832 if (!found_dev)
833 return -ENODEV;
834
835 kref_get(&found_dev->kref);
836 starget->hostdata = found_dev;
837 return 0;
838}
839EXPORT_SYMBOL_GPL(sas_target_alloc);
840
841#define SAS_DEF_QD 256
842
843int sas_slave_configure(struct scsi_device *scsi_dev)
844{
845 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
846
847 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
848
849 if (dev_is_sata(dev)) {
850 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
851 return 0;
852 }
853
854 sas_read_port_mode_page(scsi_dev);
855
856 if (scsi_dev->tagged_supported) {
857 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
858 } else {
859 pr_notice("device %016llx, LUN 0x%llx doesn't support TCQ\n",
860 SAS_ADDR(dev->sas_addr), scsi_dev->lun);
861 scsi_change_queue_depth(scsi_dev, 1);
862 }
863
864 scsi_dev->allow_restart = 1;
865
866 return 0;
867}
868EXPORT_SYMBOL_GPL(sas_slave_configure);
869
870int sas_change_queue_depth(struct scsi_device *sdev, int depth)
871{
872 struct domain_device *dev = sdev_to_domain_dev(sdev);
873
874 if (dev_is_sata(dev))
875 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
876
877 if (!sdev->tagged_supported)
878 depth = 1;
879 return scsi_change_queue_depth(sdev, depth);
880}
881EXPORT_SYMBOL_GPL(sas_change_queue_depth);
882
883int sas_bios_param(struct scsi_device *scsi_dev,
884 struct block_device *bdev,
885 sector_t capacity, int *hsc)
886{
887 hsc[0] = 255;
888 hsc[1] = 63;
889 sector_div(capacity, 255*63);
890 hsc[2] = capacity;
891
892 return 0;
893}
894EXPORT_SYMBOL_GPL(sas_bios_param);
895
896
897
898
899
900void sas_task_abort(struct sas_task *task)
901{
902 struct scsi_cmnd *sc = task->uldd_task;
903
904
905 if (!sc) {
906 struct sas_task_slow *slow = task->slow_task;
907
908 if (!slow)
909 return;
910 if (!del_timer(&slow->timer))
911 return;
912 slow->timer.function(&slow->timer);
913 return;
914 }
915
916 if (dev_is_sata(task->dev))
917 sas_ata_task_abort(task);
918 else
919 blk_abort_request(scsi_cmd_to_rq(sc));
920}
921EXPORT_SYMBOL_GPL(sas_task_abort);
922
923int sas_slave_alloc(struct scsi_device *sdev)
924{
925 if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
926 return -ENXIO;
927
928 return 0;
929}
930EXPORT_SYMBOL_GPL(sas_slave_alloc);
931
932void sas_target_destroy(struct scsi_target *starget)
933{
934 struct domain_device *found_dev = starget->hostdata;
935
936 if (!found_dev)
937 return;
938
939 starget->hostdata = NULL;
940 sas_put_device(found_dev);
941}
942EXPORT_SYMBOL_GPL(sas_target_destroy);
943
944#define SAS_STRING_ADDR_SIZE 16
945
946int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
947{
948 int res;
949 const struct firmware *fw;
950
951 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
952 if (res)
953 return res;
954
955 if (fw->size < SAS_STRING_ADDR_SIZE) {
956 res = -ENODEV;
957 goto out;
958 }
959
960 res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
961 if (res)
962 goto out;
963
964out:
965 release_firmware(fw);
966 return res;
967}
968EXPORT_SYMBOL_GPL(sas_request_addr);
969
970
