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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;
490 struct sas_task *task = TO_SAS_TASK(cmd);
491 struct Scsi_Host *host = cmd->device->host;
492 struct sas_internal *i = to_sas_internal(host->transportt);
493
494 if (current != host->ehandler)
495 return FAILED;
496
497 if (!i->dft->lldd_abort_task)
498 return FAILED;
499
500 res = i->dft->lldd_abort_task(task);
501 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
502 return SUCCESS;
503
504 return FAILED;
505}
506EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
507
508
509int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
510{
511 int res;
512 struct scsi_lun lun;
513 struct Scsi_Host *host = cmd->device->host;
514 struct domain_device *dev = cmd_to_domain_dev(cmd);
515 struct sas_internal *i = to_sas_internal(host->transportt);
516
517 if (current != host->ehandler)
518 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
519
520 int_to_scsilun(cmd->device->lun, &lun);
521
522 if (!i->dft->lldd_lu_reset)
523 return FAILED;
524
525 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
526 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
527 return SUCCESS;
528
529 return FAILED;
530}
531
532int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
533{
534 int res;
535 struct Scsi_Host *host = cmd->device->host;
536 struct domain_device *dev = cmd_to_domain_dev(cmd);
537 struct sas_internal *i = to_sas_internal(host->transportt);
538
539 if (current != host->ehandler)
540 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
541
542 if (!i->dft->lldd_I_T_nexus_reset)
543 return FAILED;
544
545 res = i->dft->lldd_I_T_nexus_reset(dev);
546 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
547 res == -ENODEV)
548 return SUCCESS;
549
550 return FAILED;
551}
552
553
554static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
555{
556 int res;
557 struct Scsi_Host *shost = cmd->device->host;
558
559 if (!shost->hostt->eh_device_reset_handler)
560 goto try_bus_reset;
561
562 res = shost->hostt->eh_device_reset_handler(cmd);
563 if (res == SUCCESS)
564 return res;
565
566try_bus_reset:
567 if (shost->hostt->eh_bus_reset_handler)
568 return shost->hostt->eh_bus_reset_handler(cmd);
569
570 return FAILED;
571}
572
573static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
574{
575 struct scsi_cmnd *cmd, *n;
576 enum task_disposition res = TASK_IS_DONE;
577 int tmf_resp, need_reset;
578 struct sas_internal *i = to_sas_internal(shost->transportt);
579 unsigned long flags;
580 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
581 LIST_HEAD(done);
582
583
584 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
585 struct domain_device *dev = cmd_to_domain_dev(cmd);
586 struct sas_task *task;
587
588 spin_lock_irqsave(&dev->done_lock, flags);
589
590
591
592
593 task = TO_SAS_TASK(cmd);
594 spin_unlock_irqrestore(&dev->done_lock, flags);
595
596 if (!task)
597 list_move_tail(&cmd->eh_entry, &done);
598 }
599
600 Again:
601 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
602 struct sas_task *task = TO_SAS_TASK(cmd);
603
604 list_del_init(&cmd->eh_entry);
605
606 spin_lock_irqsave(&task->task_state_lock, flags);
607 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
608 spin_unlock_irqrestore(&task->task_state_lock, flags);
609
610 if (need_reset) {
611 SAS_DPRINTK("%s: task 0x%p requests reset\n",
612 __func__, task);
613 goto reset;
614 }
615
616 SAS_DPRINTK("trying to find task 0x%p\n", task);
617 res = sas_scsi_find_task(task);
618
619 cmd->eh_eflags = 0;
620
621 switch (res) {
622 case TASK_IS_DONE:
623 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
624 task);
625 sas_eh_defer_cmd(cmd);
626 continue;
627 case TASK_IS_ABORTED:
628 SAS_DPRINTK("%s: task 0x%p is aborted\n",
629 __func__, task);
630 sas_eh_defer_cmd(cmd);
631 continue;
632 case TASK_IS_AT_LU:
633 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
634 reset:
635 tmf_resp = sas_recover_lu(task->dev, cmd);
636 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
637 SAS_DPRINTK("dev %016llx LU %llx is "
638 "recovered\n",
639 SAS_ADDR(task->dev),
640 cmd->device->lun);
641 sas_eh_defer_cmd(cmd);
642 sas_scsi_clear_queue_lu(work_q, cmd);
643 goto Again;
644 }
645
646 case TASK_IS_NOT_AT_LU:
647 case TASK_ABORT_FAILED:
648 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
649 task);
650 tmf_resp = sas_recover_I_T(task->dev);
651 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
652 tmf_resp == -ENODEV) {
653 struct domain_device *dev = task->dev;
654 SAS_DPRINTK("I_T %016llx recovered\n",
655 SAS_ADDR(task->dev->sas_addr));
656 sas_eh_finish_cmd(cmd);
657 sas_scsi_clear_queue_I_T(work_q, dev);
658 goto Again;
659 }
660
661 try_to_reset_cmd_device(cmd);
662 if (i->dft->lldd_clear_nexus_port) {
663 struct asd_sas_port *port = task->dev->port;
664 SAS_DPRINTK("clearing nexus for port:%d\n",
665 port->id);
666 res = i->dft->lldd_clear_nexus_port(port);
667 if (res == TMF_RESP_FUNC_COMPLETE) {
668 SAS_DPRINTK("clear nexus port:%d "
669 "succeeded\n", port->id);
670 sas_eh_finish_cmd(cmd);
671 sas_scsi_clear_queue_port(work_q,
672 port);
673 goto Again;
674 }
675 }
676 if (i->dft->lldd_clear_nexus_ha) {
677 SAS_DPRINTK("clear nexus ha\n");
678 res = i->dft->lldd_clear_nexus_ha(ha);
679 if (res == TMF_RESP_FUNC_COMPLETE) {
680 SAS_DPRINTK("clear nexus ha "
681 "succeeded\n");
682 sas_eh_finish_cmd(cmd);
683 goto clear_q;
684 }
685 }
686
687
688
689
690 SAS_DPRINTK("error from device %llx, LUN %llx "
691 "couldn't be recovered in any way\n",
692 SAS_ADDR(task->dev->sas_addr),
693 cmd->device->lun);
694
695 sas_eh_finish_cmd(cmd);
696 goto clear_q;
697 }
698 }
699 out:
700 list_splice_tail(&done, work_q);
701 list_splice_tail_init(&ha->eh_ata_q, work_q);
702 return;
703
704 clear_q:
705 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
706 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
707 sas_eh_finish_cmd(cmd);
708 goto out;
709}
710
711static void sas_eh_handle_resets(struct Scsi_Host *shost)
712{
713 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
714 struct sas_internal *i = to_sas_internal(shost->transportt);
715
716
717 spin_lock_irq(&ha->lock);
718 while (!list_empty(&ha->eh_dev_q)) {
719 struct domain_device *dev;
720 struct ssp_device *ssp;
721
722 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
723 list_del_init(&ssp->eh_list_node);
724 dev = container_of(ssp, typeof(*dev), ssp_dev);
725 kref_get(&dev->kref);
726 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
727
728 spin_unlock_irq(&ha->lock);
729
730 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
731 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
732
733 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
734 i->dft->lldd_I_T_nexus_reset(dev);
735
736 sas_put_device(dev);
737 spin_lock_irq(&ha->lock);
738 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
739 ha->eh_active--;
740 }
741 spin_unlock_irq(&ha->lock);
742}
743
744
745void sas_scsi_recover_host(struct Scsi_Host *shost)
746{
747 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
748 LIST_HEAD(eh_work_q);
749 int tries = 0;
750 bool retry;
751
752retry:
753 tries++;
754 retry = true;
755 spin_lock_irq(shost->host_lock);
756 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
757 spin_unlock_irq(shost->host_lock);
758
759 SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
760 __func__, atomic_read(&shost->host_busy), shost->host_failed);
761
762
763
764
765
766 set_bit(SAS_HA_FROZEN, &ha->state);
767 sas_eh_handle_sas_errors(shost, &eh_work_q);
768 clear_bit(SAS_HA_FROZEN, &ha->state);
769 if (list_empty(&eh_work_q))
770 goto out;
771
772
773
774
775
776
777
778 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
779 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
780 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
781
782out:
783 sas_eh_handle_resets(shost);
784
785
786 sas_ata_strategy_handler(shost);
787
788 scsi_eh_flush_done_q(&ha->eh_done_q);
789
790
791 spin_lock_irq(&ha->lock);
792 if (ha->eh_active == 0) {
793 shost->host_eh_scheduled = 0;
794 retry = false;
795 }
796 spin_unlock_irq(&ha->lock);
797
798 if (retry)
799 goto retry;
800
801 SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
802 __func__, atomic_read(&shost->host_busy),
803 shost->host_failed, tries);
804}
805
806enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
807{
808 scmd_dbg(cmd, "command %p timed out\n", cmd);
809
810 return BLK_EH_NOT_HANDLED;
811}
812
813int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
814{
815 struct domain_device *dev = sdev_to_domain_dev(sdev);
816
817 if (dev_is_sata(dev))
818 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
819
820 return -EINVAL;
821}
822
823struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
824{
825 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
826 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
827 struct domain_device *found_dev = NULL;
828 int i;
829 unsigned long flags;
830
831 spin_lock_irqsave(&ha->phy_port_lock, flags);
832 for (i = 0; i < ha->num_phys; i++) {
833 struct asd_sas_port *port = ha->sas_port[i];
834 struct domain_device *dev;
835
836 spin_lock(&port->dev_list_lock);
837 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
838 if (rphy == dev->rphy) {
839 found_dev = dev;
840 spin_unlock(&port->dev_list_lock);
841 goto found;
842 }
843 }
844 spin_unlock(&port->dev_list_lock);
845 }
846 found:
847 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
848
849 return found_dev;
850}
851
852int sas_target_alloc(struct scsi_target *starget)
853{
854 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
855 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
856
857 if (!found_dev)
858 return -ENODEV;
859
860 kref_get(&found_dev->kref);
861 starget->hostdata = found_dev;
862 return 0;
863}
864
865#define SAS_DEF_QD 256
866
867int sas_slave_configure(struct scsi_device *scsi_dev)
868{
869 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
870 struct sas_ha_struct *sas_ha;
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_ha = dev->port->ha;
880
881 sas_read_port_mode_page(scsi_dev);
882
883 if (scsi_dev->tagged_supported) {
884 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
885 } else {
886 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
887 "TCQ\n", SAS_ADDR(dev->sas_addr),
888 scsi_dev->lun);
889 scsi_change_queue_depth(scsi_dev, 1);
890 }
891
892 scsi_dev->allow_restart = 1;
893
894 return 0;
895}
896
897int sas_change_queue_depth(struct scsi_device *sdev, int depth)
898{
899 struct domain_device *dev = sdev_to_domain_dev(sdev);
900
901 if (dev_is_sata(dev))
902 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
903
904 if (!sdev->tagged_supported)
905 depth = 1;
906 return scsi_change_queue_depth(sdev, depth);
907}
908
909int sas_bios_param(struct scsi_device *scsi_dev,
910 struct block_device *bdev,
911 sector_t capacity, int *hsc)
912{
913 hsc[0] = 255;
914 hsc[1] = 63;
915 sector_div(capacity, 255*63);
916 hsc[2] = capacity;
917
918 return 0;
919}
920
921
922
923
924
925void sas_task_abort(struct sas_task *task)
926{
927 struct scsi_cmnd *sc = task->uldd_task;
928
929
930 if (!sc) {
931 struct sas_task_slow *slow = task->slow_task;
932
933 if (!slow)
934 return;
935 if (!del_timer(&slow->timer))
936 return;
937 slow->timer.function(slow->timer.data);
938 return;
939 }
940
941 if (dev_is_sata(task->dev)) {
942 sas_ata_task_abort(task);
943 } else {
944 struct request_queue *q = sc->device->request_queue;
945 unsigned long flags;
946
947 spin_lock_irqsave(q->queue_lock, flags);
948 blk_abort_request(sc->request);
949 spin_unlock_irqrestore(q->queue_lock, flags);
950 }
951}
952
953void sas_target_destroy(struct scsi_target *starget)
954{
955 struct domain_device *found_dev = starget->hostdata;
956
957 if (!found_dev)
958 return;
959
960 starget->hostdata = NULL;
961 sas_put_device(found_dev);
962}
963
964static void sas_parse_addr(u8 *sas_addr, const char *p)
965{
966 int i;
967 for (i = 0; i < SAS_ADDR_SIZE; i++) {
968 u8 h, l;
969 if (!*p)
970 break;
971 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
972 p++;
973 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
974 p++;
975 sas_addr[i] = (h<<4) | l;
976 }
977}
978
979#define SAS_STRING_ADDR_SIZE 16
980
981int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
982{
983 int res;
984 const struct firmware *fw;
985
986 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
987 if (res)
988 return res;
989
990 if (fw->size < SAS_STRING_ADDR_SIZE) {
991 res = -ENODEV;
992 goto out;
993 }
994
995 sas_parse_addr(addr, fw->data);
996
997out:
998 release_firmware(fw);
999 return res;
1000}
1001EXPORT_SYMBOL_GPL(sas_request_addr);
1002
1003EXPORT_SYMBOL_GPL(sas_queuecommand);
1004EXPORT_SYMBOL_GPL(sas_target_alloc);
1005EXPORT_SYMBOL_GPL(sas_slave_configure);
1006EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1007EXPORT_SYMBOL_GPL(sas_bios_param);
1008EXPORT_SYMBOL_GPL(sas_task_abort);
1009EXPORT_SYMBOL_GPL(sas_phy_reset);
1010EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1011EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1012EXPORT_SYMBOL_GPL(sas_target_destroy);
1013EXPORT_SYMBOL_GPL(sas_ioctl);
1014
