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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 sc->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 cmd->scsi_done(cmd);
202 return 0;
203}
204
205static 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
212
213
214
215 sas_end_task(cmd, task);
216
217 if (dev_is_sata(dev)) {
218
219
220
221 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
222 return;
223 }
224
225
226
227
228
229 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
230}
231
232static 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
243static 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
256static 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
270enum 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
278static 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->core.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 }
318
319 }
320 }
321 return res;
322}
323
324static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
325{
326 int res = TMF_RESP_FUNC_FAILED;
327 struct scsi_lun lun;
328 struct sas_internal *i =
329 to_sas_internal(dev->port->ha->core.shost->transportt);
330
331 int_to_scsilun(cmd->device->lun, &lun);
332
333 pr_notice("eh: device %016llx LUN 0x%llx has the task\n",
334 SAS_ADDR(dev->sas_addr),
335 cmd->device->lun);
336
337 if (i->dft->lldd_abort_task_set)
338 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
339
340 if (res == TMF_RESP_FUNC_FAILED) {
341 if (i->dft->lldd_clear_task_set)
342 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
343 }
344
345 if (res == TMF_RESP_FUNC_FAILED) {
346 if (i->dft->lldd_lu_reset)
347 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
348 }
349
350 return res;
351}
352
353static int sas_recover_I_T(struct domain_device *dev)
354{
355 int res = TMF_RESP_FUNC_FAILED;
356 struct sas_internal *i =
357 to_sas_internal(dev->port->ha->core.shost->transportt);
358
359 pr_notice("I_T nexus reset for dev %016llx\n",
360 SAS_ADDR(dev->sas_addr));
361
362 if (i->dft->lldd_I_T_nexus_reset)
363 res = i->dft->lldd_I_T_nexus_reset(dev);
364
365 return res;
366}
367
368
369struct sas_phy *sas_get_local_phy(struct domain_device *dev)
370{
371 struct sas_ha_struct *ha = dev->port->ha;
372 struct sas_phy *phy;
373 unsigned long flags;
374
375
376
377
378 BUG_ON(!dev->phy);
379
380 spin_lock_irqsave(&ha->phy_port_lock, flags);
381 phy = dev->phy;
382 get_device(&phy->dev);
383 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
384
385 return phy;
386}
387EXPORT_SYMBOL_GPL(sas_get_local_phy);
388
389static void sas_wait_eh(struct domain_device *dev)
390{
391 struct sas_ha_struct *ha = dev->port->ha;
392 DEFINE_WAIT(wait);
393
394 if (dev_is_sata(dev)) {
395 ata_port_wait_eh(dev->sata_dev.ap);
396 return;
397 }
398 retry:
399 spin_lock_irq(&ha->lock);
400
401 while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
402 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
403 spin_unlock_irq(&ha->lock);
404 schedule();
405 spin_lock_irq(&ha->lock);
406 }
407 finish_wait(&ha->eh_wait_q, &wait);
408
409 spin_unlock_irq(&ha->lock);
410
411
412 if (scsi_host_in_recovery(ha->core.shost)) {
413 msleep(10);
414 goto retry;
415 }
416}
417
418static int sas_queue_reset(struct domain_device *dev, int reset_type,
419 u64 lun, int wait)
420{
421 struct sas_ha_struct *ha = dev->port->ha;
422 int scheduled = 0, tries = 100;
423
424
425 if (dev_is_sata(dev)) {
426 sas_ata_schedule_reset(dev);
427 if (wait)
428 sas_ata_wait_eh(dev);
429 return SUCCESS;
430 }
431
432 while (!scheduled && tries--) {
433 spin_lock_irq(&ha->lock);
434 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
435 !test_bit(reset_type, &dev->state)) {
436 scheduled = 1;
437 ha->eh_active++;
438 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
439 set_bit(SAS_DEV_EH_PENDING, &dev->state);
440 set_bit(reset_type, &dev->state);
441 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
442 scsi_schedule_eh(ha->core.shost);
443 }
444 spin_unlock_irq(&ha->lock);
445
446 if (wait)
447 sas_wait_eh(dev);
448
449 if (scheduled)
450 return SUCCESS;
451 }
452
453 pr_warn("%s reset of %s failed\n",
454 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
455 dev_name(&dev->rphy->dev));
456
457 return FAILED;
458}
459
460int sas_eh_abort_handler(struct scsi_cmnd *cmd)
461{
462 int res = TMF_RESP_FUNC_FAILED;
463 struct sas_task *task = TO_SAS_TASK(cmd);
464 struct Scsi_Host *host = cmd->device->host;
465 struct domain_device *dev = cmd_to_domain_dev(cmd);
466 struct sas_internal *i = to_sas_internal(host->transportt);
467 unsigned long flags;
468
469 if (!i->dft->lldd_abort_task)
470 return FAILED;
471
472 spin_lock_irqsave(host->host_lock, flags);
473
474 if (dev_is_sata(dev) && !host->host_eh_scheduled) {
475 spin_unlock_irqrestore(host->host_lock, flags);
476 return FAILED;
477 }
478 spin_unlock_irqrestore(host->host_lock, flags);
479
480 if (task)
481 res = i->dft->lldd_abort_task(task);
482 else
483 pr_notice("no task to abort\n");
484 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
485 return SUCCESS;
486
487 return FAILED;
488}
489EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
490
491
492int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
493{
494 int res;
495 struct scsi_lun lun;
496 struct Scsi_Host *host = cmd->device->host;
497 struct domain_device *dev = cmd_to_domain_dev(cmd);
498 struct sas_internal *i = to_sas_internal(host->transportt);
499
500 if (current != host->ehandler)
501 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
502
503 int_to_scsilun(cmd->device->lun, &lun);
504
505 if (!i->dft->lldd_lu_reset)
506 return FAILED;
507
508 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
509 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
510 return SUCCESS;
511
512 return FAILED;
513}
514
515int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
516{
517 int res;
518 struct Scsi_Host *host = cmd->device->host;
519 struct domain_device *dev = cmd_to_domain_dev(cmd);
520 struct sas_internal *i = to_sas_internal(host->transportt);
521
522 if (current != host->ehandler)
523 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
524
525 if (!i->dft->lldd_I_T_nexus_reset)
526 return FAILED;
527
528 res = i->dft->lldd_I_T_nexus_reset(dev);
529 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
530 res == -ENODEV)
531 return SUCCESS;
532
533 return FAILED;
534}
535
536
537static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
538{
539 int res;
540 struct Scsi_Host *shost = cmd->device->host;
541
542 if (!shost->hostt->eh_device_reset_handler)
543 goto try_target_reset;
544
545 res = shost->hostt->eh_device_reset_handler(cmd);
546 if (res == SUCCESS)
547 return res;
548
549try_target_reset:
550 if (shost->hostt->eh_target_reset_handler)
551 return shost->hostt->eh_target_reset_handler(cmd);
552
553 return FAILED;
554}
555
556static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
557{
558 struct scsi_cmnd *cmd, *n;
559 enum task_disposition res = TASK_IS_DONE;
560 int tmf_resp, need_reset;
561 struct sas_internal *i = to_sas_internal(shost->transportt);
562 unsigned long flags;
563 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
564 LIST_HEAD(done);
565
566
567 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
568 struct domain_device *dev = cmd_to_domain_dev(cmd);
569 struct sas_task *task;
570
571 spin_lock_irqsave(&dev->done_lock, flags);
572
573
574
575
576 task = TO_SAS_TASK(cmd);
577 spin_unlock_irqrestore(&dev->done_lock, flags);
578
579 if (!task)
580 list_move_tail(&cmd->eh_entry, &done);
581 }
582
583 Again:
584 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
585 struct sas_task *task = TO_SAS_TASK(cmd);
586
587 list_del_init(&cmd->eh_entry);
588
589 spin_lock_irqsave(&task->task_state_lock, flags);
590 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
591 spin_unlock_irqrestore(&task->task_state_lock, flags);
592
593 if (need_reset) {
594 pr_notice("%s: task 0x%p requests reset\n",
595 __func__, task);
596 goto reset;
597 }
598
599 pr_debug("trying to find task 0x%p\n", task);
600 res = sas_scsi_find_task(task);
601
602 switch (res) {
603 case TASK_IS_DONE:
604 pr_notice("%s: task 0x%p is done\n", __func__,
605 task);
606 sas_eh_finish_cmd(cmd);
607 continue;
608 case TASK_IS_ABORTED:
609 pr_notice("%s: task 0x%p is aborted\n",
610 __func__, task);
611 sas_eh_finish_cmd(cmd);
612 continue;
613 case TASK_IS_AT_LU:
614 pr_info("task 0x%p is at LU: lu recover\n", task);
615 reset:
616 tmf_resp = sas_recover_lu(task->dev, cmd);
617 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
618 pr_notice("dev %016llx LU 0x%llx is recovered\n",
619 SAS_ADDR(task->dev),
620 cmd->device->lun);
621 sas_eh_finish_cmd(cmd);
622 sas_scsi_clear_queue_lu(work_q, cmd);
623 goto Again;
624 }
625 fallthrough;
626 case TASK_IS_NOT_AT_LU:
627 case TASK_ABORT_FAILED:
628 pr_notice("task 0x%p is not at LU: I_T recover\n",
629 task);
630 tmf_resp = sas_recover_I_T(task->dev);
631 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
632 tmf_resp == -ENODEV) {
633 struct domain_device *dev = task->dev;
634 pr_notice("I_T %016llx recovered\n",
635 SAS_ADDR(task->dev->sas_addr));
636 sas_eh_finish_cmd(cmd);
637 sas_scsi_clear_queue_I_T(work_q, dev);
638 goto Again;
639 }
640
641 try_to_reset_cmd_device(cmd);
642 if (i->dft->lldd_clear_nexus_port) {
643 struct asd_sas_port *port = task->dev->port;
644 pr_debug("clearing nexus for port:%d\n",
645 port->id);
646 res = i->dft->lldd_clear_nexus_port(port);
647 if (res == TMF_RESP_FUNC_COMPLETE) {
648 pr_notice("clear nexus port:%d succeeded\n",
649 port->id);
650 sas_eh_finish_cmd(cmd);
651 sas_scsi_clear_queue_port(work_q,
652 port);
653 goto Again;
654 }
655 }
656 if (i->dft->lldd_clear_nexus_ha) {
657 pr_debug("clear nexus ha\n");
658 res = i->dft->lldd_clear_nexus_ha(ha);
659 if (res == TMF_RESP_FUNC_COMPLETE) {
660 pr_notice("clear nexus ha succeeded\n");
661 sas_eh_finish_cmd(cmd);
662 goto clear_q;
663 }
664 }
665
666
667
668
669 pr_err("error from device %016llx, LUN 0x%llx couldn't be recovered in any way\n",
670 SAS_ADDR(task->dev->sas_addr),
671 cmd->device->lun);
672
673 sas_eh_finish_cmd(cmd);
674 goto clear_q;
675 }
676 }
677 out:
678 list_splice_tail(&done, work_q);
679 list_splice_tail_init(&ha->eh_ata_q, work_q);
680 return;
681
682 clear_q:
683 pr_debug("--- Exit %s -- clear_q\n", __func__);
684 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
685 sas_eh_finish_cmd(cmd);
686 goto out;
687}
688
689static void sas_eh_handle_resets(struct Scsi_Host *shost)
690{
691 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
692 struct sas_internal *i = to_sas_internal(shost->transportt);
693
694
695 spin_lock_irq(&ha->lock);
696 while (!list_empty(&ha->eh_dev_q)) {
697 struct domain_device *dev;
698 struct ssp_device *ssp;
699
700 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
701 list_del_init(&ssp->eh_list_node);
702 dev = container_of(ssp, typeof(*dev), ssp_dev);
703 kref_get(&dev->kref);
704 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
705
706 spin_unlock_irq(&ha->lock);
707
708 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
709 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
710
711 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
712 i->dft->lldd_I_T_nexus_reset(dev);
713
714 sas_put_device(dev);
715 spin_lock_irq(&ha->lock);
716 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
717 ha->eh_active--;
718 }
719 spin_unlock_irq(&ha->lock);
720}
721
722
723void sas_scsi_recover_host(struct Scsi_Host *shost)
724{
725 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
726 LIST_HEAD(eh_work_q);
727 int tries = 0;
728 bool retry;
729
730retry:
731 tries++;
732 retry = true;
733 spin_lock_irq(shost->host_lock);
734 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
735 spin_unlock_irq(shost->host_lock);
736
737 pr_notice("Enter %s busy: %d failed: %d\n",
738 __func__, scsi_host_busy(shost), shost->host_failed);
739
740
741
742
743
744 set_bit(SAS_HA_FROZEN, &ha->state);
745 sas_eh_handle_sas_errors(shost, &eh_work_q);
746 clear_bit(SAS_HA_FROZEN, &ha->state);
747 if (list_empty(&eh_work_q))
748 goto out;
749
750
751
752
753
754
755
756 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
757 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
758 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
759
760out:
761 sas_eh_handle_resets(shost);
762
763
764 sas_ata_strategy_handler(shost);
765
766 scsi_eh_flush_done_q(&ha->eh_done_q);
767
768
769 spin_lock_irq(&ha->lock);
770 if (ha->eh_active == 0) {
771 shost->host_eh_scheduled = 0;
772 retry = false;
773 }
774 spin_unlock_irq(&ha->lock);
775
776 if (retry)
777 goto retry;
778
779 pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n",
780 __func__, scsi_host_busy(shost),
781 shost->host_failed, tries);
782}
783
784int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
785{
786 struct domain_device *dev = sdev_to_domain_dev(sdev);
787
788 if (dev_is_sata(dev))
789 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
790
791 return -EINVAL;
792}
793
794struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
795{
796 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
797 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
798 struct domain_device *found_dev = NULL;
799 int i;
800 unsigned long flags;
801
802 spin_lock_irqsave(&ha->phy_port_lock, flags);
803 for (i = 0; i < ha->num_phys; i++) {
804 struct asd_sas_port *port = ha->sas_port[i];
805 struct domain_device *dev;
806
807 spin_lock(&port->dev_list_lock);
808 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
809 if (rphy == dev->rphy) {
810 found_dev = dev;
811 spin_unlock(&port->dev_list_lock);
812 goto found;
813 }
814 }
815 spin_unlock(&port->dev_list_lock);
816 }
817 found:
818 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
819
820 return found_dev;
821}
822
823int sas_target_alloc(struct scsi_target *starget)
824{
825 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
826 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
827
828 if (!found_dev)
829 return -ENODEV;
830
831 kref_get(&found_dev->kref);
832 starget->hostdata = found_dev;
833 return 0;
834}
835
836#define SAS_DEF_QD 256
837
838int sas_slave_configure(struct scsi_device *scsi_dev)
839{
840 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
841
842 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
843
844 if (dev_is_sata(dev)) {
845 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
846 return 0;
847 }
848
849 sas_read_port_mode_page(scsi_dev);
850
851 if (scsi_dev->tagged_supported) {
852 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
853 } else {
854 pr_notice("device %016llx, LUN 0x%llx doesn't support TCQ\n",
855 SAS_ADDR(dev->sas_addr), scsi_dev->lun);
856 scsi_change_queue_depth(scsi_dev, 1);
857 }
858
859 scsi_dev->allow_restart = 1;
860
861 return 0;
862}
863
864int sas_change_queue_depth(struct scsi_device *sdev, int depth)
865{
866 struct domain_device *dev = sdev_to_domain_dev(sdev);
867
868 if (dev_is_sata(dev))
869 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
870
871 if (!sdev->tagged_supported)
872 depth = 1;
873 return scsi_change_queue_depth(sdev, depth);
874}
875
876int sas_bios_param(struct scsi_device *scsi_dev,
877 struct block_device *bdev,
878 sector_t capacity, int *hsc)
879{
880 hsc[0] = 255;
881 hsc[1] = 63;
882 sector_div(capacity, 255*63);
883 hsc[2] = capacity;
884
885 return 0;
886}
887
888
889
890
891
892void sas_task_abort(struct sas_task *task)
893{
894 struct scsi_cmnd *sc = task->uldd_task;
895
896
897 if (!sc) {
898 struct sas_task_slow *slow = task->slow_task;
899
900 if (!slow)
901 return;
902 if (!del_timer(&slow->timer))
903 return;
904 slow->timer.function(&slow->timer);
905 return;
906 }
907
908 if (dev_is_sata(task->dev))
909 sas_ata_task_abort(task);
910 else
911 blk_abort_request(scsi_cmd_to_rq(sc));
912}
913
914int sas_slave_alloc(struct scsi_device *sdev)
915{
916 if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
917 return -ENXIO;
918
919 return 0;
920}
921
922void sas_target_destroy(struct scsi_target *starget)
923{
924 struct domain_device *found_dev = starget->hostdata;
925
926 if (!found_dev)
927 return;
928
929 starget->hostdata = NULL;
930 sas_put_device(found_dev);
931}
932
933#define SAS_STRING_ADDR_SIZE 16
934
935int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
936{
937 int res;
938 const struct firmware *fw;
939
940 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
941 if (res)
942 return res;
943
944 if (fw->size < SAS_STRING_ADDR_SIZE) {
945 res = -ENODEV;
946 goto out;
947 }
948
949 res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
950 if (res)
951 goto out;
952
953out:
954 release_firmware(fw);
955 return res;
956}
957EXPORT_SYMBOL_GPL(sas_request_addr);
958
959EXPORT_SYMBOL_GPL(sas_queuecommand);
960EXPORT_SYMBOL_GPL(sas_target_alloc);
961EXPORT_SYMBOL_GPL(sas_slave_configure);
962EXPORT_SYMBOL_GPL(sas_change_queue_depth);
963EXPORT_SYMBOL_GPL(sas_bios_param);
964EXPORT_SYMBOL_GPL(sas_task_abort);
965EXPORT_SYMBOL_GPL(sas_phy_reset);
966EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
967EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
968EXPORT_SYMBOL_GPL(sas_slave_alloc);
969EXPORT_SYMBOL_GPL(sas_target_destroy);
970EXPORT_SYMBOL_GPL(sas_ioctl);
971
