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26#include <linux/kthread.h>
27#include <linux/firmware.h>
28#include <linux/export.h>
29#include <linux/ctype.h>
30
31#include "sas_internal.h"
32
33#include <scsi/scsi_host.h>
34#include <scsi/scsi_device.h>
35#include <scsi/scsi_tcq.h>
36#include <scsi/scsi.h>
37#include <scsi/scsi_eh.h>
38#include <scsi/scsi_transport.h>
39#include <scsi/scsi_transport_sas.h>
40#include <scsi/sas_ata.h>
41#include "../scsi_sas_internal.h"
42#include "../scsi_transport_api.h"
43#include "../scsi_priv.h"
44
45#include <linux/err.h>
46#include <linux/blkdev.h>
47#include <linux/freezer.h>
48#include <linux/gfp.h>
49#include <linux/scatterlist.h>
50#include <linux/libata.h>
51
52
53static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
54{
55 struct task_status_struct *ts = &task->task_status;
56 int hs = 0, stat = 0;
57
58 if (ts->resp == SAS_TASK_UNDELIVERED) {
59
60 hs = DID_NO_CONNECT;
61 } else {
62
63 switch (ts->stat) {
64 case SAS_DEV_NO_RESPONSE:
65 case SAS_INTERRUPTED:
66 case SAS_PHY_DOWN:
67 case SAS_NAK_R_ERR:
68 case SAS_OPEN_TO:
69 hs = DID_NO_CONNECT;
70 break;
71 case SAS_DATA_UNDERRUN:
72 scsi_set_resid(sc, ts->residual);
73 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
74 hs = DID_ERROR;
75 break;
76 case SAS_DATA_OVERRUN:
77 hs = DID_ERROR;
78 break;
79 case SAS_QUEUE_FULL:
80 hs = DID_SOFT_ERROR;
81 break;
82 case SAS_DEVICE_UNKNOWN:
83 hs = DID_BAD_TARGET;
84 break;
85 case SAS_SG_ERR:
86 hs = DID_PARITY;
87 break;
88 case SAS_OPEN_REJECT:
89 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
90 hs = DID_SOFT_ERROR;
91 else
92 hs = DID_ERROR;
93 break;
94 case SAS_PROTO_RESPONSE:
95 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
96 "task; please report this\n",
97 task->dev->port->ha->sas_ha_name);
98 break;
99 case SAS_ABORTED_TASK:
100 hs = DID_ABORT;
101 break;
102 case SAM_STAT_CHECK_CONDITION:
103 memcpy(sc->sense_buffer, ts->buf,
104 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
105 stat = SAM_STAT_CHECK_CONDITION;
106 break;
107 default:
108 stat = ts->stat;
109 break;
110 }
111 }
112
113 sc->result = (hs << 16) | stat;
114 ASSIGN_SAS_TASK(sc, NULL);
115 sas_free_task(task);
116}
117
118static void sas_scsi_task_done(struct sas_task *task)
119{
120 struct scsi_cmnd *sc = task->uldd_task;
121 struct domain_device *dev = task->dev;
122 struct sas_ha_struct *ha = dev->port->ha;
123 unsigned long flags;
124
125 spin_lock_irqsave(&dev->done_lock, flags);
126 if (test_bit(SAS_HA_FROZEN, &ha->state))
127 task = NULL;
128 else
129 ASSIGN_SAS_TASK(sc, NULL);
130 spin_unlock_irqrestore(&dev->done_lock, flags);
131
132 if (unlikely(!task)) {
133
134 SAS_DPRINTK("task done but aborted\n");
135 return;
136 }
137
138 if (unlikely(!sc)) {
139 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
140 sas_free_task(task);
141 return;
142 }
143
144 sas_end_task(sc, task);
145 sc->scsi_done(sc);
146}
147
148static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
149 struct domain_device *dev,
150 gfp_t gfp_flags)
151{
152 struct sas_task *task = sas_alloc_task(gfp_flags);
153 struct scsi_lun lun;
154
155 if (!task)
156 return NULL;
157
158 task->uldd_task = cmd;
159 ASSIGN_SAS_TASK(cmd, task);
160
161 task->dev = dev;
162 task->task_proto = task->dev->tproto;
163
164 task->ssp_task.retry_count = 1;
165 int_to_scsilun(cmd->device->lun, &lun);
166 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
167 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
168 task->ssp_task.cmd = cmd;
169
170 task->scatter = scsi_sglist(cmd);
171 task->num_scatter = scsi_sg_count(cmd);
172 task->total_xfer_len = scsi_bufflen(cmd);
173 task->data_dir = cmd->sc_data_direction;
174
175 task->task_done = sas_scsi_task_done;
176
177 return task;
178}
179
180int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
181{
182 struct sas_internal *i = to_sas_internal(host->transportt);
183 struct domain_device *dev = cmd_to_domain_dev(cmd);
184 struct sas_task *task;
185 int res = 0;
186
187
188 if (test_bit(SAS_DEV_GONE, &dev->state)) {
189 cmd->result = DID_BAD_TARGET << 16;
190 goto out_done;
191 }
192
193 if (dev_is_sata(dev)) {
194 spin_lock_irq(dev->sata_dev.ap->lock);
195 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
196 spin_unlock_irq(dev->sata_dev.ap->lock);
197 return res;
198 }
199
200 task = sas_create_task(cmd, dev, GFP_ATOMIC);
201 if (!task)
202 return SCSI_MLQUEUE_HOST_BUSY;
203
204 res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
205 if (res)
206 goto out_free_task;
207 return 0;
208
209out_free_task:
210 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
211 ASSIGN_SAS_TASK(cmd, NULL);
212 sas_free_task(task);
213 if (res == -SAS_QUEUE_FULL)
214 cmd->result = DID_SOFT_ERROR << 16;
215 else
216 cmd->result = DID_ERROR << 16;
217out_done:
218 cmd->scsi_done(cmd);
219 return 0;
220}
221
222static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
223{
224 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
225 struct sas_task *task = TO_SAS_TASK(cmd);
226
227
228
229
230
231 sas_end_task(cmd, task);
232
233
234
235
236
237 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
238}
239
240static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
241{
242 struct domain_device *dev = cmd_to_domain_dev(cmd);
243 struct sas_ha_struct *ha = dev->port->ha;
244 struct sas_task *task = TO_SAS_TASK(cmd);
245
246 if (!dev_is_sata(dev)) {
247 sas_eh_finish_cmd(cmd);
248 return;
249 }
250
251
252 sas_end_task(cmd, task);
253 list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
254}
255
256static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
257{
258 struct scsi_cmnd *cmd, *n;
259
260 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
261 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
262 cmd->device->lun == my_cmd->device->lun)
263 sas_eh_defer_cmd(cmd);
264 }
265}
266
267static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
268 struct domain_device *dev)
269{
270 struct scsi_cmnd *cmd, *n;
271
272 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
273 struct domain_device *x = cmd_to_domain_dev(cmd);
274
275 if (x == dev)
276 sas_eh_finish_cmd(cmd);
277 }
278}
279
280static void sas_scsi_clear_queue_port(struct list_head *error_q,
281 struct asd_sas_port *port)
282{
283 struct scsi_cmnd *cmd, *n;
284
285 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
286 struct domain_device *dev = cmd_to_domain_dev(cmd);
287 struct asd_sas_port *x = dev->port;
288
289 if (x == port)
290 sas_eh_finish_cmd(cmd);
291 }
292}
293
294enum task_disposition {
295 TASK_IS_DONE,
296 TASK_IS_ABORTED,
297 TASK_IS_AT_LU,
298 TASK_IS_NOT_AT_LU,
299 TASK_ABORT_FAILED,
300};
301
302static enum task_disposition sas_scsi_find_task(struct sas_task *task)
303{
304 unsigned long flags;
305 int i, res;
306 struct sas_internal *si =
307 to_sas_internal(task->dev->port->ha->core.shost->transportt);
308
309 for (i = 0; i < 5; i++) {
310 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
311 res = si->dft->lldd_abort_task(task);
312
313 spin_lock_irqsave(&task->task_state_lock, flags);
314 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
315 spin_unlock_irqrestore(&task->task_state_lock, flags);
316 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
317 task);
318 return TASK_IS_DONE;
319 }
320 spin_unlock_irqrestore(&task->task_state_lock, flags);
321
322 if (res == TMF_RESP_FUNC_COMPLETE) {
323 SAS_DPRINTK("%s: task 0x%p is aborted\n",
324 __func__, task);
325 return TASK_IS_ABORTED;
326 } else if (si->dft->lldd_query_task) {
327 SAS_DPRINTK("%s: querying task 0x%p\n",
328 __func__, task);
329 res = si->dft->lldd_query_task(task);
330 switch (res) {
331 case TMF_RESP_FUNC_SUCC:
332 SAS_DPRINTK("%s: task 0x%p at LU\n",
333 __func__, task);
334 return TASK_IS_AT_LU;
335 case TMF_RESP_FUNC_COMPLETE:
336 SAS_DPRINTK("%s: task 0x%p not at LU\n",
337 __func__, task);
338 return TASK_IS_NOT_AT_LU;
339 case TMF_RESP_FUNC_FAILED:
340 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
341 __func__, task);
342 return TASK_ABORT_FAILED;
343 }
344
345 }
346 }
347 return res;
348}
349
350static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
351{
352 int res = TMF_RESP_FUNC_FAILED;
353 struct scsi_lun lun;
354 struct sas_internal *i =
355 to_sas_internal(dev->port->ha->core.shost->transportt);
356
357 int_to_scsilun(cmd->device->lun, &lun);
358
359 SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
360 SAS_ADDR(dev->sas_addr),
361 cmd->device->lun);
362
363 if (i->dft->lldd_abort_task_set)
364 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
365
366 if (res == TMF_RESP_FUNC_FAILED) {
367 if (i->dft->lldd_clear_task_set)
368 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
369 }
370
371 if (res == TMF_RESP_FUNC_FAILED) {
372 if (i->dft->lldd_lu_reset)
373 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
374 }
375
376 return res;
377}
378
379static int sas_recover_I_T(struct domain_device *dev)
380{
381 int res = TMF_RESP_FUNC_FAILED;
382 struct sas_internal *i =
383 to_sas_internal(dev->port->ha->core.shost->transportt);
384
385 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
386 SAS_ADDR(dev->sas_addr));
387
388 if (i->dft->lldd_I_T_nexus_reset)
389 res = i->dft->lldd_I_T_nexus_reset(dev);
390
391 return res;
392}
393
394
395struct sas_phy *sas_get_local_phy(struct domain_device *dev)
396{
397 struct sas_ha_struct *ha = dev->port->ha;
398 struct sas_phy *phy;
399 unsigned long flags;
400
401
402
403
404 BUG_ON(!dev->phy);
405
406 spin_lock_irqsave(&ha->phy_port_lock, flags);
407 phy = dev->phy;
408 get_device(&phy->dev);
409 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
410
411 return phy;
412}
413EXPORT_SYMBOL_GPL(sas_get_local_phy);
414
415static void sas_wait_eh(struct domain_device *dev)
416{
417 struct sas_ha_struct *ha = dev->port->ha;
418 DEFINE_WAIT(wait);
419
420 if (dev_is_sata(dev)) {
421 ata_port_wait_eh(dev->sata_dev.ap);
422 return;
423 }
424 retry:
425 spin_lock_irq(&ha->lock);
426
427 while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
428 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
429 spin_unlock_irq(&ha->lock);
430 schedule();
431 spin_lock_irq(&ha->lock);
432 }
433 finish_wait(&ha->eh_wait_q, &wait);
434
435 spin_unlock_irq(&ha->lock);
436
437
438 if (scsi_host_in_recovery(ha->core.shost)) {
439 msleep(10);
440 goto retry;
441 }
442}
443EXPORT_SYMBOL(sas_wait_eh);
444
445static int sas_queue_reset(struct domain_device *dev, int reset_type,
446 u64 lun, int wait)
447{
448 struct sas_ha_struct *ha = dev->port->ha;
449 int scheduled = 0, tries = 100;
450
451
452 if (dev_is_sata(dev)) {
453 sas_ata_schedule_reset(dev);
454 if (wait)
455 sas_ata_wait_eh(dev);
456 return SUCCESS;
457 }
458
459 while (!scheduled && tries--) {
460 spin_lock_irq(&ha->lock);
461 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
462 !test_bit(reset_type, &dev->state)) {
463 scheduled = 1;
464 ha->eh_active++;
465 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
466 set_bit(SAS_DEV_EH_PENDING, &dev->state);
467 set_bit(reset_type, &dev->state);
468 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
469 scsi_schedule_eh(ha->core.shost);
470 }
471 spin_unlock_irq(&ha->lock);
472
473 if (wait)
474 sas_wait_eh(dev);
475
476 if (scheduled)
477 return SUCCESS;
478 }
479
480 SAS_DPRINTK("%s reset of %s failed\n",
481 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
482 dev_name(&dev->rphy->dev));
483
484 return FAILED;
485}
486
487int sas_eh_abort_handler(struct scsi_cmnd *cmd)
488{
489 int res = TMF_RESP_FUNC_FAILED;
490 struct sas_task *task = TO_SAS_TASK(cmd);
491 struct Scsi_Host *host = cmd->device->host;
492 struct domain_device *dev = cmd_to_domain_dev(cmd);
493 struct sas_internal *i = to_sas_internal(host->transportt);
494 unsigned long flags;
495
496 if (!i->dft->lldd_abort_task)
497 return FAILED;
498
499 spin_lock_irqsave(host->host_lock, flags);
500
501 if (dev_is_sata(dev) && !host->host_eh_scheduled) {
502 spin_unlock_irqrestore(host->host_lock, flags);
503 return FAILED;
504 }
505 spin_unlock_irqrestore(host->host_lock, flags);
506
507 if (task)
508 res = i->dft->lldd_abort_task(task);
509 else
510 SAS_DPRINTK("no task to abort\n");
511 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
512 return SUCCESS;
513
514 return FAILED;
515}
516EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
517
518
519int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
520{
521 int res;
522 struct scsi_lun lun;
523 struct Scsi_Host *host = cmd->device->host;
524 struct domain_device *dev = cmd_to_domain_dev(cmd);
525 struct sas_internal *i = to_sas_internal(host->transportt);
526
527 if (current != host->ehandler)
528 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
529
530 int_to_scsilun(cmd->device->lun, &lun);
531
532 if (!i->dft->lldd_lu_reset)
533 return FAILED;
534
535 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
536 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
537 return SUCCESS;
538
539 return FAILED;
540}
541
542int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
543{
544 int res;
545 struct Scsi_Host *host = cmd->device->host;
546 struct domain_device *dev = cmd_to_domain_dev(cmd);
547 struct sas_internal *i = to_sas_internal(host->transportt);
548
549 if (current != host->ehandler)
550 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
551
552 if (!i->dft->lldd_I_T_nexus_reset)
553 return FAILED;
554
555 res = i->dft->lldd_I_T_nexus_reset(dev);
556 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
557 res == -ENODEV)
558 return SUCCESS;
559
560 return FAILED;
561}
562
563
564static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
565{
566 int res;
567 struct Scsi_Host *shost = cmd->device->host;
568
569 if (!shost->hostt->eh_device_reset_handler)
570 goto try_target_reset;
571
572 res = shost->hostt->eh_device_reset_handler(cmd);
573 if (res == SUCCESS)
574 return res;
575
576try_target_reset:
577 if (shost->hostt->eh_target_reset_handler)
578 return shost->hostt->eh_target_reset_handler(cmd);
579
580 return FAILED;
581}
582
583static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
584{
585 struct scsi_cmnd *cmd, *n;
586 enum task_disposition res = TASK_IS_DONE;
587 int tmf_resp, need_reset;
588 struct sas_internal *i = to_sas_internal(shost->transportt);
589 unsigned long flags;
590 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
591 LIST_HEAD(done);
592
593
594 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
595 struct domain_device *dev = cmd_to_domain_dev(cmd);
596 struct sas_task *task;
597
598 spin_lock_irqsave(&dev->done_lock, flags);
599
600
601
602
603 task = TO_SAS_TASK(cmd);
604 spin_unlock_irqrestore(&dev->done_lock, flags);
605
606 if (!task)
607 list_move_tail(&cmd->eh_entry, &done);
608 }
609
610 Again:
611 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
612 struct sas_task *task = TO_SAS_TASK(cmd);
613
614 list_del_init(&cmd->eh_entry);
615
616 spin_lock_irqsave(&task->task_state_lock, flags);
617 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
618 spin_unlock_irqrestore(&task->task_state_lock, flags);
619
620 if (need_reset) {
621 SAS_DPRINTK("%s: task 0x%p requests reset\n",
622 __func__, task);
623 goto reset;
624 }
625
626 SAS_DPRINTK("trying to find task 0x%p\n", task);
627 res = sas_scsi_find_task(task);
628
629 switch (res) {
630 case TASK_IS_DONE:
631 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
632 task);
633 sas_eh_defer_cmd(cmd);
634 continue;
635 case TASK_IS_ABORTED:
636 SAS_DPRINTK("%s: task 0x%p is aborted\n",
637 __func__, task);
638 sas_eh_defer_cmd(cmd);
639 continue;
640 case TASK_IS_AT_LU:
641 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
642 reset:
643 tmf_resp = sas_recover_lu(task->dev, cmd);
644 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
645 SAS_DPRINTK("dev %016llx LU %llx is "
646 "recovered\n",
647 SAS_ADDR(task->dev),
648 cmd->device->lun);
649 sas_eh_defer_cmd(cmd);
650 sas_scsi_clear_queue_lu(work_q, cmd);
651 goto Again;
652 }
653
654 case TASK_IS_NOT_AT_LU:
655 case TASK_ABORT_FAILED:
656 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
657 task);
658 tmf_resp = sas_recover_I_T(task->dev);
659 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
660 tmf_resp == -ENODEV) {
661 struct domain_device *dev = task->dev;
662 SAS_DPRINTK("I_T %016llx recovered\n",
663 SAS_ADDR(task->dev->sas_addr));
664 sas_eh_finish_cmd(cmd);
665 sas_scsi_clear_queue_I_T(work_q, dev);
666 goto Again;
667 }
668
669 try_to_reset_cmd_device(cmd);
670 if (i->dft->lldd_clear_nexus_port) {
671 struct asd_sas_port *port = task->dev->port;
672 SAS_DPRINTK("clearing nexus for port:%d\n",
673 port->id);
674 res = i->dft->lldd_clear_nexus_port(port);
675 if (res == TMF_RESP_FUNC_COMPLETE) {
676 SAS_DPRINTK("clear nexus port:%d "
677 "succeeded\n", port->id);
678 sas_eh_finish_cmd(cmd);
679 sas_scsi_clear_queue_port(work_q,
680 port);
681 goto Again;
682 }
683 }
684 if (i->dft->lldd_clear_nexus_ha) {
685 SAS_DPRINTK("clear nexus ha\n");
686 res = i->dft->lldd_clear_nexus_ha(ha);
687 if (res == TMF_RESP_FUNC_COMPLETE) {
688 SAS_DPRINTK("clear nexus ha "
689 "succeeded\n");
690 sas_eh_finish_cmd(cmd);
691 goto clear_q;
692 }
693 }
694
695
696
697
698 SAS_DPRINTK("error from device %llx, LUN %llx "
699 "couldn't be recovered in any way\n",
700 SAS_ADDR(task->dev->sas_addr),
701 cmd->device->lun);
702
703 sas_eh_finish_cmd(cmd);
704 goto clear_q;
705 }
706 }
707 out:
708 list_splice_tail(&done, work_q);
709 list_splice_tail_init(&ha->eh_ata_q, work_q);
710 return;
711
712 clear_q:
713 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
714 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
715 sas_eh_finish_cmd(cmd);
716 goto out;
717}
718
719static void sas_eh_handle_resets(struct Scsi_Host *shost)
720{
721 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
722 struct sas_internal *i = to_sas_internal(shost->transportt);
723
724
725 spin_lock_irq(&ha->lock);
726 while (!list_empty(&ha->eh_dev_q)) {
727 struct domain_device *dev;
728 struct ssp_device *ssp;
729
730 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
731 list_del_init(&ssp->eh_list_node);
732 dev = container_of(ssp, typeof(*dev), ssp_dev);
733 kref_get(&dev->kref);
734 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
735
736 spin_unlock_irq(&ha->lock);
737
738 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
739 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
740
741 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
742 i->dft->lldd_I_T_nexus_reset(dev);
743
744 sas_put_device(dev);
745 spin_lock_irq(&ha->lock);
746 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
747 ha->eh_active--;
748 }
749 spin_unlock_irq(&ha->lock);
750}
751
752
753void sas_scsi_recover_host(struct Scsi_Host *shost)
754{
755 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
756 LIST_HEAD(eh_work_q);
757 int tries = 0;
758 bool retry;
759
760retry:
761 tries++;
762 retry = true;
763 spin_lock_irq(shost->host_lock);
764 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
765 spin_unlock_irq(shost->host_lock);
766
767 SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
768 __func__, atomic_read(&shost->host_busy), shost->host_failed);
769
770
771
772
773
774 set_bit(SAS_HA_FROZEN, &ha->state);
775 sas_eh_handle_sas_errors(shost, &eh_work_q);
776 clear_bit(SAS_HA_FROZEN, &ha->state);
777 if (list_empty(&eh_work_q))
778 goto out;
779
780
781
782
783
784
785
786 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
787 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
788 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
789
790out:
791 sas_eh_handle_resets(shost);
792
793
794 sas_ata_strategy_handler(shost);
795
796 scsi_eh_flush_done_q(&ha->eh_done_q);
797
798
799 spin_lock_irq(&ha->lock);
800 if (ha->eh_active == 0) {
801 shost->host_eh_scheduled = 0;
802 retry = false;
803 }
804 spin_unlock_irq(&ha->lock);
805
806 if (retry)
807 goto retry;
808
809 SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
810 __func__, atomic_read(&shost->host_busy),
811 shost->host_failed, tries);
812}
813
814int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
815{
816 struct domain_device *dev = sdev_to_domain_dev(sdev);
817
818 if (dev_is_sata(dev))
819 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
820
821 return -EINVAL;
822}
823
824struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
825{
826 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
827 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
828 struct domain_device *found_dev = NULL;
829 int i;
830 unsigned long flags;
831
832 spin_lock_irqsave(&ha->phy_port_lock, flags);
833 for (i = 0; i < ha->num_phys; i++) {
834 struct asd_sas_port *port = ha->sas_port[i];
835 struct domain_device *dev;
836
837 spin_lock(&port->dev_list_lock);
838 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
839 if (rphy == dev->rphy) {
840 found_dev = dev;
841 spin_unlock(&port->dev_list_lock);
842 goto found;
843 }
844 }
845 spin_unlock(&port->dev_list_lock);
846 }
847 found:
848 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
849
850 return found_dev;
851}
852
853int sas_target_alloc(struct scsi_target *starget)
854{
855 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
856 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
857
858 if (!found_dev)
859 return -ENODEV;
860
861 kref_get(&found_dev->kref);
862 starget->hostdata = found_dev;
863 return 0;
864}
865
866#define SAS_DEF_QD 256
867
868int sas_slave_configure(struct scsi_device *scsi_dev)
869{
870 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
871
872 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
873
874 if (dev_is_sata(dev)) {
875 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
876 return 0;
877 }
878
879 sas_read_port_mode_page(scsi_dev);
880
881 if (scsi_dev->tagged_supported) {
882 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
883 } else {
884 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
885 "TCQ\n", SAS_ADDR(dev->sas_addr),
886 scsi_dev->lun);
887 scsi_change_queue_depth(scsi_dev, 1);
888 }
889
890 scsi_dev->allow_restart = 1;
891
892 return 0;
893}
894
895int sas_change_queue_depth(struct scsi_device *sdev, int depth)
896{
897 struct domain_device *dev = sdev_to_domain_dev(sdev);
898
899 if (dev_is_sata(dev))
900 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
901
902 if (!sdev->tagged_supported)
903 depth = 1;
904 return scsi_change_queue_depth(sdev, depth);
905}
906
907int sas_bios_param(struct scsi_device *scsi_dev,
908 struct block_device *bdev,
909 sector_t capacity, int *hsc)
910{
911 hsc[0] = 255;
912 hsc[1] = 63;
913 sector_div(capacity, 255*63);
914 hsc[2] = capacity;
915
916 return 0;
917}
918
919
920
921
922
923void sas_task_abort(struct sas_task *task)
924{
925 struct scsi_cmnd *sc = task->uldd_task;
926
927
928 if (!sc) {
929 struct sas_task_slow *slow = task->slow_task;
930
931 if (!slow)
932 return;
933 if (!del_timer(&slow->timer))
934 return;
935 slow->timer.function(&slow->timer);
936 return;
937 }
938
939 if (dev_is_sata(task->dev)) {
940 sas_ata_task_abort(task);
941 } else {
942 struct request_queue *q = sc->device->request_queue;
943 unsigned long flags;
944
945 spin_lock_irqsave(q->queue_lock, flags);
946 blk_abort_request(sc->request);
947 spin_unlock_irqrestore(q->queue_lock, flags);
948 }
949}
950
951void sas_target_destroy(struct scsi_target *starget)
952{
953 struct domain_device *found_dev = starget->hostdata;
954
955 if (!found_dev)
956 return;
957
958 starget->hostdata = NULL;
959 sas_put_device(found_dev);
960}
961
962static void sas_parse_addr(u8 *sas_addr, const char *p)
963{
964 int i;
965 for (i = 0; i < SAS_ADDR_SIZE; i++) {
966 u8 h, l;
967 if (!*p)
968 break;
969 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
970 p++;
971 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
972 p++;
973 sas_addr[i] = (h<<4) | l;
974 }
975}
976
977#define SAS_STRING_ADDR_SIZE 16
978
979int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
980{
981 int res;
982 const struct firmware *fw;
983
984 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
985 if (res)
986 return res;
987
988 if (fw->size < SAS_STRING_ADDR_SIZE) {
989 res = -ENODEV;
990 goto out;
991 }
992
993 sas_parse_addr(addr, fw->data);
994
995out:
996 release_firmware(fw);
997 return res;
998}
999EXPORT_SYMBOL_GPL(sas_request_addr);
1000
1001EXPORT_SYMBOL_GPL(sas_queuecommand);
1002EXPORT_SYMBOL_GPL(sas_target_alloc);
1003EXPORT_SYMBOL_GPL(sas_slave_configure);
1004EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1005EXPORT_SYMBOL_GPL(sas_bios_param);
1006EXPORT_SYMBOL_GPL(sas_task_abort);
1007EXPORT_SYMBOL_GPL(sas_phy_reset);
1008EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1009EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
1010EXPORT_SYMBOL_GPL(sas_target_destroy);
1011EXPORT_SYMBOL_GPL(sas_ioctl);
1012
