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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 list_del_init(&task->list);
116 sas_free_task(task);
117}
118
119static void sas_scsi_task_done(struct sas_task *task)
120{
121 struct scsi_cmnd *sc = task->uldd_task;
122 struct domain_device *dev = task->dev;
123 struct sas_ha_struct *ha = dev->port->ha;
124 unsigned long flags;
125
126 spin_lock_irqsave(&dev->done_lock, flags);
127 if (test_bit(SAS_HA_FROZEN, &ha->state))
128 task = NULL;
129 else
130 ASSIGN_SAS_TASK(sc, NULL);
131 spin_unlock_irqrestore(&dev->done_lock, flags);
132
133 if (unlikely(!task)) {
134
135 SAS_DPRINTK("task done but aborted\n");
136 return;
137 }
138
139 if (unlikely(!sc)) {
140 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
141 list_del_init(&task->list);
142 sas_free_task(task);
143 return;
144 }
145
146 sas_end_task(sc, task);
147 sc->scsi_done(sc);
148}
149
150static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
151 struct domain_device *dev,
152 gfp_t gfp_flags)
153{
154 struct sas_task *task = sas_alloc_task(gfp_flags);
155 struct scsi_lun lun;
156
157 if (!task)
158 return NULL;
159
160 task->uldd_task = cmd;
161 ASSIGN_SAS_TASK(cmd, task);
162
163 task->dev = dev;
164 task->task_proto = task->dev->tproto;
165
166 task->ssp_task.retry_count = 1;
167 int_to_scsilun(cmd->device->lun, &lun);
168 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
169 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
170 task->ssp_task.cmd = cmd;
171
172 task->scatter = scsi_sglist(cmd);
173 task->num_scatter = scsi_sg_count(cmd);
174 task->total_xfer_len = scsi_bufflen(cmd);
175 task->data_dir = cmd->sc_data_direction;
176
177 task->task_done = sas_scsi_task_done;
178
179 return task;
180}
181
182int sas_queue_up(struct sas_task *task)
183{
184 struct sas_ha_struct *sas_ha = task->dev->port->ha;
185 struct scsi_core *core = &sas_ha->core;
186 unsigned long flags;
187 LIST_HEAD(list);
188
189 spin_lock_irqsave(&core->task_queue_lock, flags);
190 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
191 spin_unlock_irqrestore(&core->task_queue_lock, flags);
192 return -SAS_QUEUE_FULL;
193 }
194 list_add_tail(&task->list, &core->task_queue);
195 core->task_queue_size += 1;
196 spin_unlock_irqrestore(&core->task_queue_lock, flags);
197 wake_up_process(core->queue_thread);
198
199 return 0;
200}
201
202int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
203{
204 struct sas_internal *i = to_sas_internal(host->transportt);
205 struct domain_device *dev = cmd_to_domain_dev(cmd);
206 struct sas_ha_struct *sas_ha = dev->port->ha;
207 struct sas_task *task;
208 int res = 0;
209
210
211 if (test_bit(SAS_DEV_GONE, &dev->state)) {
212 cmd->result = DID_BAD_TARGET << 16;
213 goto out_done;
214 }
215
216 if (dev_is_sata(dev)) {
217 spin_lock_irq(dev->sata_dev.ap->lock);
218 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
219 spin_unlock_irq(dev->sata_dev.ap->lock);
220 return res;
221 }
222
223 task = sas_create_task(cmd, dev, GFP_ATOMIC);
224 if (!task)
225 return SCSI_MLQUEUE_HOST_BUSY;
226
227
228 if (sas_ha->lldd_max_execute_num < 2)
229 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
230 else
231 res = sas_queue_up(task);
232
233 if (res)
234 goto out_free_task;
235 return 0;
236
237out_free_task:
238 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
239 ASSIGN_SAS_TASK(cmd, NULL);
240 sas_free_task(task);
241 if (res == -SAS_QUEUE_FULL)
242 cmd->result = DID_SOFT_ERROR << 16;
243 else
244 cmd->result = DID_ERROR << 16;
245out_done:
246 cmd->scsi_done(cmd);
247 return 0;
248}
249
250static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
251{
252 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
253 struct sas_task *task = TO_SAS_TASK(cmd);
254
255
256
257
258
259 sas_end_task(cmd, task);
260
261
262
263
264
265 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
266}
267
268static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
269{
270 struct domain_device *dev = cmd_to_domain_dev(cmd);
271 struct sas_ha_struct *ha = dev->port->ha;
272 struct sas_task *task = TO_SAS_TASK(cmd);
273
274 if (!dev_is_sata(dev)) {
275 sas_eh_finish_cmd(cmd);
276 return;
277 }
278
279
280 sas_end_task(cmd, task);
281 list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
282}
283
284static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
285{
286 struct scsi_cmnd *cmd, *n;
287
288 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
289 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
290 cmd->device->lun == my_cmd->device->lun)
291 sas_eh_defer_cmd(cmd);
292 }
293}
294
295static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
296 struct domain_device *dev)
297{
298 struct scsi_cmnd *cmd, *n;
299
300 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
301 struct domain_device *x = cmd_to_domain_dev(cmd);
302
303 if (x == dev)
304 sas_eh_finish_cmd(cmd);
305 }
306}
307
308static void sas_scsi_clear_queue_port(struct list_head *error_q,
309 struct asd_sas_port *port)
310{
311 struct scsi_cmnd *cmd, *n;
312
313 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
314 struct domain_device *dev = cmd_to_domain_dev(cmd);
315 struct asd_sas_port *x = dev->port;
316
317 if (x == port)
318 sas_eh_finish_cmd(cmd);
319 }
320}
321
322enum task_disposition {
323 TASK_IS_DONE,
324 TASK_IS_ABORTED,
325 TASK_IS_AT_LU,
326 TASK_IS_NOT_AT_HA,
327 TASK_IS_NOT_AT_LU,
328 TASK_ABORT_FAILED,
329};
330
331static enum task_disposition sas_scsi_find_task(struct sas_task *task)
332{
333 struct sas_ha_struct *ha = task->dev->port->ha;
334 unsigned long flags;
335 int i, res;
336 struct sas_internal *si =
337 to_sas_internal(task->dev->port->ha->core.shost->transportt);
338
339 if (ha->lldd_max_execute_num > 1) {
340 struct scsi_core *core = &ha->core;
341 struct sas_task *t, *n;
342
343 mutex_lock(&core->task_queue_flush);
344 spin_lock_irqsave(&core->task_queue_lock, flags);
345 list_for_each_entry_safe(t, n, &core->task_queue, list)
346 if (task == t) {
347 list_del_init(&t->list);
348 break;
349 }
350 spin_unlock_irqrestore(&core->task_queue_lock, flags);
351 mutex_unlock(&core->task_queue_flush);
352
353 if (task == t)
354 return TASK_IS_NOT_AT_HA;
355 }
356
357 for (i = 0; i < 5; i++) {
358 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
359 res = si->dft->lldd_abort_task(task);
360
361 spin_lock_irqsave(&task->task_state_lock, flags);
362 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
363 spin_unlock_irqrestore(&task->task_state_lock, flags);
364 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
365 task);
366 return TASK_IS_DONE;
367 }
368 spin_unlock_irqrestore(&task->task_state_lock, flags);
369
370 if (res == TMF_RESP_FUNC_COMPLETE) {
371 SAS_DPRINTK("%s: task 0x%p is aborted\n",
372 __func__, task);
373 return TASK_IS_ABORTED;
374 } else if (si->dft->lldd_query_task) {
375 SAS_DPRINTK("%s: querying task 0x%p\n",
376 __func__, task);
377 res = si->dft->lldd_query_task(task);
378 switch (res) {
379 case TMF_RESP_FUNC_SUCC:
380 SAS_DPRINTK("%s: task 0x%p at LU\n",
381 __func__, task);
382 return TASK_IS_AT_LU;
383 case TMF_RESP_FUNC_COMPLETE:
384 SAS_DPRINTK("%s: task 0x%p not at LU\n",
385 __func__, task);
386 return TASK_IS_NOT_AT_LU;
387 case TMF_RESP_FUNC_FAILED:
388 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
389 __func__, task);
390 return TASK_ABORT_FAILED;
391 }
392
393 }
394 }
395 return res;
396}
397
398static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
399{
400 int res = TMF_RESP_FUNC_FAILED;
401 struct scsi_lun lun;
402 struct sas_internal *i =
403 to_sas_internal(dev->port->ha->core.shost->transportt);
404
405 int_to_scsilun(cmd->device->lun, &lun);
406
407 SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
408 SAS_ADDR(dev->sas_addr),
409 cmd->device->lun);
410
411 if (i->dft->lldd_abort_task_set)
412 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
413
414 if (res == TMF_RESP_FUNC_FAILED) {
415 if (i->dft->lldd_clear_task_set)
416 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
417 }
418
419 if (res == TMF_RESP_FUNC_FAILED) {
420 if (i->dft->lldd_lu_reset)
421 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
422 }
423
424 return res;
425}
426
427static int sas_recover_I_T(struct domain_device *dev)
428{
429 int res = TMF_RESP_FUNC_FAILED;
430 struct sas_internal *i =
431 to_sas_internal(dev->port->ha->core.shost->transportt);
432
433 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
434 SAS_ADDR(dev->sas_addr));
435
436 if (i->dft->lldd_I_T_nexus_reset)
437 res = i->dft->lldd_I_T_nexus_reset(dev);
438
439 return res;
440}
441
442
443struct sas_phy *sas_get_local_phy(struct domain_device *dev)
444{
445 struct sas_ha_struct *ha = dev->port->ha;
446 struct sas_phy *phy;
447 unsigned long flags;
448
449
450
451
452 BUG_ON(!dev->phy);
453
454 spin_lock_irqsave(&ha->phy_port_lock, flags);
455 phy = dev->phy;
456 get_device(&phy->dev);
457 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
458
459 return phy;
460}
461EXPORT_SYMBOL_GPL(sas_get_local_phy);
462
463static void sas_wait_eh(struct domain_device *dev)
464{
465 struct sas_ha_struct *ha = dev->port->ha;
466 DEFINE_WAIT(wait);
467
468 if (dev_is_sata(dev)) {
469 ata_port_wait_eh(dev->sata_dev.ap);
470 return;
471 }
472 retry:
473 spin_lock_irq(&ha->lock);
474
475 while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
476 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
477 spin_unlock_irq(&ha->lock);
478 schedule();
479 spin_lock_irq(&ha->lock);
480 }
481 finish_wait(&ha->eh_wait_q, &wait);
482
483 spin_unlock_irq(&ha->lock);
484
485
486 if (scsi_host_in_recovery(ha->core.shost)) {
487 msleep(10);
488 goto retry;
489 }
490}
491EXPORT_SYMBOL(sas_wait_eh);
492
493static int sas_queue_reset(struct domain_device *dev, int reset_type,
494 u64 lun, int wait)
495{
496 struct sas_ha_struct *ha = dev->port->ha;
497 int scheduled = 0, tries = 100;
498
499
500 if (dev_is_sata(dev)) {
501 sas_ata_schedule_reset(dev);
502 if (wait)
503 sas_ata_wait_eh(dev);
504 return SUCCESS;
505 }
506
507 while (!scheduled && tries--) {
508 spin_lock_irq(&ha->lock);
509 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
510 !test_bit(reset_type, &dev->state)) {
511 scheduled = 1;
512 ha->eh_active++;
513 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
514 set_bit(SAS_DEV_EH_PENDING, &dev->state);
515 set_bit(reset_type, &dev->state);
516 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
517 scsi_schedule_eh(ha->core.shost);
518 }
519 spin_unlock_irq(&ha->lock);
520
521 if (wait)
522 sas_wait_eh(dev);
523
524 if (scheduled)
525 return SUCCESS;
526 }
527
528 SAS_DPRINTK("%s reset of %s failed\n",
529 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
530 dev_name(&dev->rphy->dev));
531
532 return FAILED;
533}
534
535int sas_eh_abort_handler(struct scsi_cmnd *cmd)
536{
537 int res;
538 struct sas_task *task = TO_SAS_TASK(cmd);
539 struct Scsi_Host *host = cmd->device->host;
540 struct sas_internal *i = to_sas_internal(host->transportt);
541
542 if (current != host->ehandler)
543 return FAILED;
544
545 if (!i->dft->lldd_abort_task)
546 return FAILED;
547
548 res = i->dft->lldd_abort_task(task);
549 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
550 return SUCCESS;
551
552 return FAILED;
553}
554EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
555
556
557int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
558{
559 int res;
560 struct scsi_lun lun;
561 struct Scsi_Host *host = cmd->device->host;
562 struct domain_device *dev = cmd_to_domain_dev(cmd);
563 struct sas_internal *i = to_sas_internal(host->transportt);
564
565 if (current != host->ehandler)
566 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
567
568 int_to_scsilun(cmd->device->lun, &lun);
569
570 if (!i->dft->lldd_lu_reset)
571 return FAILED;
572
573 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
574 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
575 return SUCCESS;
576
577 return FAILED;
578}
579
580int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
581{
582 int res;
583 struct Scsi_Host *host = cmd->device->host;
584 struct domain_device *dev = cmd_to_domain_dev(cmd);
585 struct sas_internal *i = to_sas_internal(host->transportt);
586
587 if (current != host->ehandler)
588 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
589
590 if (!i->dft->lldd_I_T_nexus_reset)
591 return FAILED;
592
593 res = i->dft->lldd_I_T_nexus_reset(dev);
594 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
595 res == -ENODEV)
596 return SUCCESS;
597
598 return FAILED;
599}
600
601
602static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
603{
604 int res;
605 struct Scsi_Host *shost = cmd->device->host;
606
607 if (!shost->hostt->eh_device_reset_handler)
608 goto try_bus_reset;
609
610 res = shost->hostt->eh_device_reset_handler(cmd);
611 if (res == SUCCESS)
612 return res;
613
614try_bus_reset:
615 if (shost->hostt->eh_bus_reset_handler)
616 return shost->hostt->eh_bus_reset_handler(cmd);
617
618 return FAILED;
619}
620
621static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
622{
623 struct scsi_cmnd *cmd, *n;
624 enum task_disposition res = TASK_IS_DONE;
625 int tmf_resp, need_reset;
626 struct sas_internal *i = to_sas_internal(shost->transportt);
627 unsigned long flags;
628 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
629 LIST_HEAD(done);
630
631
632 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
633 struct domain_device *dev = cmd_to_domain_dev(cmd);
634 struct sas_task *task;
635
636 spin_lock_irqsave(&dev->done_lock, flags);
637
638
639
640
641 task = TO_SAS_TASK(cmd);
642 spin_unlock_irqrestore(&dev->done_lock, flags);
643
644 if (!task)
645 list_move_tail(&cmd->eh_entry, &done);
646 }
647
648 Again:
649 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
650 struct sas_task *task = TO_SAS_TASK(cmd);
651
652 list_del_init(&cmd->eh_entry);
653
654 spin_lock_irqsave(&task->task_state_lock, flags);
655 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
656 spin_unlock_irqrestore(&task->task_state_lock, flags);
657
658 if (need_reset) {
659 SAS_DPRINTK("%s: task 0x%p requests reset\n",
660 __func__, task);
661 goto reset;
662 }
663
664 SAS_DPRINTK("trying to find task 0x%p\n", task);
665 res = sas_scsi_find_task(task);
666
667 cmd->eh_eflags = 0;
668
669 switch (res) {
670 case TASK_IS_NOT_AT_HA:
671 SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n",
672 __func__, task,
673 cmd->retries ? "retry" : "aborted");
674 if (cmd->retries)
675 cmd->retries--;
676 sas_eh_finish_cmd(cmd);
677 continue;
678 case TASK_IS_DONE:
679 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
680 task);
681 sas_eh_defer_cmd(cmd);
682 continue;
683 case TASK_IS_ABORTED:
684 SAS_DPRINTK("%s: task 0x%p is aborted\n",
685 __func__, task);
686 sas_eh_defer_cmd(cmd);
687 continue;
688 case TASK_IS_AT_LU:
689 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
690 reset:
691 tmf_resp = sas_recover_lu(task->dev, cmd);
692 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
693 SAS_DPRINTK("dev %016llx LU %llx is "
694 "recovered\n",
695 SAS_ADDR(task->dev),
696 cmd->device->lun);
697 sas_eh_defer_cmd(cmd);
698 sas_scsi_clear_queue_lu(work_q, cmd);
699 goto Again;
700 }
701
702 case TASK_IS_NOT_AT_LU:
703 case TASK_ABORT_FAILED:
704 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
705 task);
706 tmf_resp = sas_recover_I_T(task->dev);
707 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
708 tmf_resp == -ENODEV) {
709 struct domain_device *dev = task->dev;
710 SAS_DPRINTK("I_T %016llx recovered\n",
711 SAS_ADDR(task->dev->sas_addr));
712 sas_eh_finish_cmd(cmd);
713 sas_scsi_clear_queue_I_T(work_q, dev);
714 goto Again;
715 }
716
717 try_to_reset_cmd_device(cmd);
718 if (i->dft->lldd_clear_nexus_port) {
719 struct asd_sas_port *port = task->dev->port;
720 SAS_DPRINTK("clearing nexus for port:%d\n",
721 port->id);
722 res = i->dft->lldd_clear_nexus_port(port);
723 if (res == TMF_RESP_FUNC_COMPLETE) {
724 SAS_DPRINTK("clear nexus port:%d "
725 "succeeded\n", port->id);
726 sas_eh_finish_cmd(cmd);
727 sas_scsi_clear_queue_port(work_q,
728 port);
729 goto Again;
730 }
731 }
732 if (i->dft->lldd_clear_nexus_ha) {
733 SAS_DPRINTK("clear nexus ha\n");
734 res = i->dft->lldd_clear_nexus_ha(ha);
735 if (res == TMF_RESP_FUNC_COMPLETE) {
736 SAS_DPRINTK("clear nexus ha "
737 "succeeded\n");
738 sas_eh_finish_cmd(cmd);
739 goto clear_q;
740 }
741 }
742
743
744
745
746 SAS_DPRINTK("error from device %llx, LUN %llx "
747 "couldn't be recovered in any way\n",
748 SAS_ADDR(task->dev->sas_addr),
749 cmd->device->lun);
750
751 sas_eh_finish_cmd(cmd);
752 goto clear_q;
753 }
754 }
755 out:
756 list_splice_tail(&done, work_q);
757 list_splice_tail_init(&ha->eh_ata_q, work_q);
758 return;
759
760 clear_q:
761 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
762 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
763 sas_eh_finish_cmd(cmd);
764 goto out;
765}
766
767static void sas_eh_handle_resets(struct Scsi_Host *shost)
768{
769 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
770 struct sas_internal *i = to_sas_internal(shost->transportt);
771
772
773 spin_lock_irq(&ha->lock);
774 while (!list_empty(&ha->eh_dev_q)) {
775 struct domain_device *dev;
776 struct ssp_device *ssp;
777
778 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
779 list_del_init(&ssp->eh_list_node);
780 dev = container_of(ssp, typeof(*dev), ssp_dev);
781 kref_get(&dev->kref);
782 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
783
784 spin_unlock_irq(&ha->lock);
785
786 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
787 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
788
789 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
790 i->dft->lldd_I_T_nexus_reset(dev);
791
792 sas_put_device(dev);
793 spin_lock_irq(&ha->lock);
794 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
795 ha->eh_active--;
796 }
797 spin_unlock_irq(&ha->lock);
798}
799
800
801void sas_scsi_recover_host(struct Scsi_Host *shost)
802{
803 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
804 LIST_HEAD(eh_work_q);
805 int tries = 0;
806 bool retry;
807
808retry:
809 tries++;
810 retry = true;
811 spin_lock_irq(shost->host_lock);
812 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
813 spin_unlock_irq(shost->host_lock);
814
815 SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
816 __func__, atomic_read(&shost->host_busy), shost->host_failed);
817
818
819
820
821
822 set_bit(SAS_HA_FROZEN, &ha->state);
823 sas_eh_handle_sas_errors(shost, &eh_work_q);
824 clear_bit(SAS_HA_FROZEN, &ha->state);
825 if (list_empty(&eh_work_q))
826 goto out;
827
828
829
830
831
832
833
834 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
835 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
836 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
837
838out:
839 if (ha->lldd_max_execute_num > 1)
840 wake_up_process(ha->core.queue_thread);
841
842 sas_eh_handle_resets(shost);
843
844
845 sas_ata_strategy_handler(shost);
846
847 scsi_eh_flush_done_q(&ha->eh_done_q);
848
849
850 spin_lock_irq(&ha->lock);
851 if (ha->eh_active == 0) {
852 shost->host_eh_scheduled = 0;
853 retry = false;
854 }
855 spin_unlock_irq(&ha->lock);
856
857 if (retry)
858 goto retry;
859
860 SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
861 __func__, atomic_read(&shost->host_busy),
862 shost->host_failed, tries);
863}
864
865enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
866{
867 scmd_dbg(cmd, "command %p timed out\n", cmd);
868
869 return BLK_EH_NOT_HANDLED;
870}
871
872int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
873{
874 struct domain_device *dev = sdev_to_domain_dev(sdev);
875
876 if (dev_is_sata(dev))
877 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
878
879 return -EINVAL;
880}
881
882struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
883{
884 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
885 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
886 struct domain_device *found_dev = NULL;
887 int i;
888 unsigned long flags;
889
890 spin_lock_irqsave(&ha->phy_port_lock, flags);
891 for (i = 0; i < ha->num_phys; i++) {
892 struct asd_sas_port *port = ha->sas_port[i];
893 struct domain_device *dev;
894
895 spin_lock(&port->dev_list_lock);
896 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
897 if (rphy == dev->rphy) {
898 found_dev = dev;
899 spin_unlock(&port->dev_list_lock);
900 goto found;
901 }
902 }
903 spin_unlock(&port->dev_list_lock);
904 }
905 found:
906 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
907
908 return found_dev;
909}
910
911int sas_target_alloc(struct scsi_target *starget)
912{
913 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
914 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
915
916 if (!found_dev)
917 return -ENODEV;
918
919 kref_get(&found_dev->kref);
920 starget->hostdata = found_dev;
921 return 0;
922}
923
924#define SAS_DEF_QD 256
925
926int sas_slave_configure(struct scsi_device *scsi_dev)
927{
928 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
929 struct sas_ha_struct *sas_ha;
930
931 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
932
933 if (dev_is_sata(dev)) {
934 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
935 return 0;
936 }
937
938 sas_ha = dev->port->ha;
939
940 sas_read_port_mode_page(scsi_dev);
941
942 if (scsi_dev->tagged_supported) {
943 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
944 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
945 } else {
946 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
947 "TCQ\n", SAS_ADDR(dev->sas_addr),
948 scsi_dev->lun);
949 scsi_dev->tagged_supported = 0;
950 scsi_set_tag_type(scsi_dev, 0);
951 scsi_deactivate_tcq(scsi_dev, 1);
952 }
953
954 scsi_dev->allow_restart = 1;
955
956 return 0;
957}
958
959int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
960{
961 struct domain_device *dev = sdev_to_domain_dev(sdev);
962
963 if (dev_is_sata(dev))
964 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
965 reason);
966
967 switch (reason) {
968 case SCSI_QDEPTH_DEFAULT:
969 case SCSI_QDEPTH_RAMP_UP:
970 if (!sdev->tagged_supported)
971 depth = 1;
972 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
973 break;
974 case SCSI_QDEPTH_QFULL:
975 scsi_track_queue_full(sdev, depth);
976 break;
977 default:
978 return -EOPNOTSUPP;
979 }
980
981 return depth;
982}
983
984int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
985{
986 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
987
988 if (dev_is_sata(dev))
989 return -EINVAL;
990
991 if (!scsi_dev->tagged_supported)
992 return 0;
993
994 scsi_deactivate_tcq(scsi_dev, 1);
995
996 scsi_set_tag_type(scsi_dev, qt);
997 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
998
999 return qt;
1000}
1001
1002int sas_bios_param(struct scsi_device *scsi_dev,
1003 struct block_device *bdev,
1004 sector_t capacity, int *hsc)
1005{
1006 hsc[0] = 255;
1007 hsc[1] = 63;
1008 sector_div(capacity, 255*63);
1009 hsc[2] = capacity;
1010
1011 return 0;
1012}
1013
1014
1015
1016static void sas_queue(struct sas_ha_struct *sas_ha)
1017{
1018 struct scsi_core *core = &sas_ha->core;
1019 unsigned long flags;
1020 LIST_HEAD(q);
1021 int can_queue;
1022 int res;
1023 struct sas_internal *i = to_sas_internal(core->shost->transportt);
1024
1025 mutex_lock(&core->task_queue_flush);
1026 spin_lock_irqsave(&core->task_queue_lock, flags);
1027 while (!kthread_should_stop() &&
1028 !list_empty(&core->task_queue) &&
1029 !test_bit(SAS_HA_FROZEN, &sas_ha->state)) {
1030
1031 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
1032 if (can_queue >= 0) {
1033 can_queue = core->task_queue_size;
1034 list_splice_init(&core->task_queue, &q);
1035 } else {
1036 struct list_head *a, *n;
1037
1038 can_queue = sas_ha->lldd_queue_size;
1039 list_for_each_safe(a, n, &core->task_queue) {
1040 list_move_tail(a, &q);
1041 if (--can_queue == 0)
1042 break;
1043 }
1044 can_queue = sas_ha->lldd_queue_size;
1045 }
1046 core->task_queue_size -= can_queue;
1047 spin_unlock_irqrestore(&core->task_queue_lock, flags);
1048 {
1049 struct sas_task *task = list_entry(q.next,
1050 struct sas_task,
1051 list);
1052 list_del_init(&q);
1053 res = i->dft->lldd_execute_task(task, can_queue,
1054 GFP_KERNEL);
1055 if (unlikely(res))
1056 __list_add(&q, task->list.prev, &task->list);
1057 }
1058 spin_lock_irqsave(&core->task_queue_lock, flags);
1059 if (res) {
1060 list_splice_init(&q, &core->task_queue);
1061 core->task_queue_size += can_queue;
1062 }
1063 }
1064 spin_unlock_irqrestore(&core->task_queue_lock, flags);
1065 mutex_unlock(&core->task_queue_flush);
1066}
1067
1068
1069
1070
1071
1072static int sas_queue_thread(void *_sas_ha)
1073{
1074 struct sas_ha_struct *sas_ha = _sas_ha;
1075
1076 while (1) {
1077 set_current_state(TASK_INTERRUPTIBLE);
1078 schedule();
1079 sas_queue(sas_ha);
1080 if (kthread_should_stop())
1081 break;
1082 }
1083
1084 return 0;
1085}
1086
1087int sas_init_queue(struct sas_ha_struct *sas_ha)
1088{
1089 struct scsi_core *core = &sas_ha->core;
1090
1091 spin_lock_init(&core->task_queue_lock);
1092 mutex_init(&core->task_queue_flush);
1093 core->task_queue_size = 0;
1094 INIT_LIST_HEAD(&core->task_queue);
1095
1096 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
1097 "sas_queue_%d", core->shost->host_no);
1098 if (IS_ERR(core->queue_thread))
1099 return PTR_ERR(core->queue_thread);
1100 return 0;
1101}
1102
1103void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
1104{
1105 unsigned long flags;
1106 struct scsi_core *core = &sas_ha->core;
1107 struct sas_task *task, *n;
1108
1109 kthread_stop(core->queue_thread);
1110
1111 if (!list_empty(&core->task_queue))
1112 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
1113 SAS_ADDR(sas_ha->sas_addr));
1114
1115 spin_lock_irqsave(&core->task_queue_lock, flags);
1116 list_for_each_entry_safe(task, n, &core->task_queue, list) {
1117 struct scsi_cmnd *cmd = task->uldd_task;
1118
1119 list_del_init(&task->list);
1120
1121 ASSIGN_SAS_TASK(cmd, NULL);
1122 sas_free_task(task);
1123 cmd->result = DID_ABORT << 16;
1124 cmd->scsi_done(cmd);
1125 }
1126 spin_unlock_irqrestore(&core->task_queue_lock, flags);
1127}
1128
1129
1130
1131
1132
1133void sas_task_abort(struct sas_task *task)
1134{
1135 struct scsi_cmnd *sc = task->uldd_task;
1136
1137
1138 if (!sc) {
1139 struct sas_task_slow *slow = task->slow_task;
1140
1141 if (!slow)
1142 return;
1143 if (!del_timer(&slow->timer))
1144 return;
1145 slow->timer.function(slow->timer.data);
1146 return;
1147 }
1148
1149 if (dev_is_sata(task->dev)) {
1150 sas_ata_task_abort(task);
1151 } else {
1152 struct request_queue *q = sc->device->request_queue;
1153 unsigned long flags;
1154
1155 spin_lock_irqsave(q->queue_lock, flags);
1156 blk_abort_request(sc->request);
1157 spin_unlock_irqrestore(q->queue_lock, flags);
1158 }
1159}
1160
1161void sas_target_destroy(struct scsi_target *starget)
1162{
1163 struct domain_device *found_dev = starget->hostdata;
1164
1165 if (!found_dev)
1166 return;
1167
1168 starget->hostdata = NULL;
1169 sas_put_device(found_dev);
1170}
1171
1172static void sas_parse_addr(u8 *sas_addr, const char *p)
1173{
1174 int i;
1175 for (i = 0; i < SAS_ADDR_SIZE; i++) {
1176 u8 h, l;
1177 if (!*p)
1178 break;
1179 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1180 p++;
1181 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1182 p++;
1183 sas_addr[i] = (h<<4) | l;
1184 }
1185}
1186
1187#define SAS_STRING_ADDR_SIZE 16
1188
1189int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1190{
1191 int res;
1192 const struct firmware *fw;
1193
1194 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1195 if (res)
1196 return res;
1197
1198 if (fw->size < SAS_STRING_ADDR_SIZE) {
1199 res = -ENODEV;
1200 goto out;
1201 }
1202
1203 sas_parse_addr(addr, fw->data);
1204
1205out:
1206 release_firmware(fw);
1207 return res;
1208}
1209EXPORT_SYMBOL_GPL(sas_request_addr);
1210
1211EXPORT_SYMBOL_GPL(sas_queuecommand);
1212EXPORT_SYMBOL_GPL(sas_target_alloc);
1213EXPORT_SYMBOL_GPL(sas_slave_configure);
1214EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1215EXPORT_SYMBOL_GPL(sas_change_queue_type);
1216EXPORT_SYMBOL_GPL(sas_bios_param);
1217EXPORT_SYMBOL_GPL(sas_task_abort);
1218EXPORT_SYMBOL_GPL(sas_phy_reset);
1219EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1220EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1221EXPORT_SYMBOL_GPL(sas_target_destroy);
1222EXPORT_SYMBOL_GPL(sas_ioctl);
1223
