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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 %x 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, int lun, int wait)
494{
495 struct sas_ha_struct *ha = dev->port->ha;
496 int scheduled = 0, tries = 100;
497
498
499 if (dev_is_sata(dev)) {
500 sas_ata_schedule_reset(dev);
501 if (wait)
502 sas_ata_wait_eh(dev);
503 return SUCCESS;
504 }
505
506 while (!scheduled && tries--) {
507 spin_lock_irq(&ha->lock);
508 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
509 !test_bit(reset_type, &dev->state)) {
510 scheduled = 1;
511 ha->eh_active++;
512 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
513 set_bit(SAS_DEV_EH_PENDING, &dev->state);
514 set_bit(reset_type, &dev->state);
515 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
516 scsi_schedule_eh(ha->core.shost);
517 }
518 spin_unlock_irq(&ha->lock);
519
520 if (wait)
521 sas_wait_eh(dev);
522
523 if (scheduled)
524 return SUCCESS;
525 }
526
527 SAS_DPRINTK("%s reset of %s failed\n",
528 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
529 dev_name(&dev->rphy->dev));
530
531 return FAILED;
532}
533
534int sas_eh_abort_handler(struct scsi_cmnd *cmd)
535{
536 int res;
537 struct sas_task *task = TO_SAS_TASK(cmd);
538 struct Scsi_Host *host = cmd->device->host;
539 struct sas_internal *i = to_sas_internal(host->transportt);
540
541 if (current != host->ehandler)
542 return FAILED;
543
544 if (!i->dft->lldd_abort_task)
545 return FAILED;
546
547 res = i->dft->lldd_abort_task(task);
548 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
549 return SUCCESS;
550
551 return FAILED;
552}
553EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
554
555
556int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
557{
558 int res;
559 struct scsi_lun lun;
560 struct Scsi_Host *host = cmd->device->host;
561 struct domain_device *dev = cmd_to_domain_dev(cmd);
562 struct sas_internal *i = to_sas_internal(host->transportt);
563
564 if (current != host->ehandler)
565 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
566
567 int_to_scsilun(cmd->device->lun, &lun);
568
569 if (!i->dft->lldd_lu_reset)
570 return FAILED;
571
572 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
573 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
574 return SUCCESS;
575
576 return FAILED;
577}
578
579int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
580{
581 int res;
582 struct Scsi_Host *host = cmd->device->host;
583 struct domain_device *dev = cmd_to_domain_dev(cmd);
584 struct sas_internal *i = to_sas_internal(host->transportt);
585
586 if (current != host->ehandler)
587 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
588
589 if (!i->dft->lldd_I_T_nexus_reset)
590 return FAILED;
591
592 res = i->dft->lldd_I_T_nexus_reset(dev);
593 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
594 res == -ENODEV)
595 return SUCCESS;
596
597 return FAILED;
598}
599
600
601static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
602{
603 int res;
604 struct Scsi_Host *shost = cmd->device->host;
605
606 if (!shost->hostt->eh_device_reset_handler)
607 goto try_bus_reset;
608
609 res = shost->hostt->eh_device_reset_handler(cmd);
610 if (res == SUCCESS)
611 return res;
612
613try_bus_reset:
614 if (shost->hostt->eh_bus_reset_handler)
615 return shost->hostt->eh_bus_reset_handler(cmd);
616
617 return FAILED;
618}
619
620static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
621{
622 struct scsi_cmnd *cmd, *n;
623 enum task_disposition res = TASK_IS_DONE;
624 int tmf_resp, need_reset;
625 struct sas_internal *i = to_sas_internal(shost->transportt);
626 unsigned long flags;
627 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
628 LIST_HEAD(done);
629
630
631 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
632 struct domain_device *dev = cmd_to_domain_dev(cmd);
633 struct sas_task *task;
634
635 spin_lock_irqsave(&dev->done_lock, flags);
636
637
638
639
640 task = TO_SAS_TASK(cmd);
641 spin_unlock_irqrestore(&dev->done_lock, flags);
642
643 if (!task)
644 list_move_tail(&cmd->eh_entry, &done);
645 }
646
647 Again:
648 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
649 struct sas_task *task = TO_SAS_TASK(cmd);
650
651 list_del_init(&cmd->eh_entry);
652
653 spin_lock_irqsave(&task->task_state_lock, flags);
654 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
655 spin_unlock_irqrestore(&task->task_state_lock, flags);
656
657 if (need_reset) {
658 SAS_DPRINTK("%s: task 0x%p requests reset\n",
659 __func__, task);
660 goto reset;
661 }
662
663 SAS_DPRINTK("trying to find task 0x%p\n", task);
664 res = sas_scsi_find_task(task);
665
666 cmd->eh_eflags = 0;
667
668 switch (res) {
669 case TASK_IS_NOT_AT_HA:
670 SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n",
671 __func__, task,
672 cmd->retries ? "retry" : "aborted");
673 if (cmd->retries)
674 cmd->retries--;
675 sas_eh_finish_cmd(cmd);
676 continue;
677 case TASK_IS_DONE:
678 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
679 task);
680 sas_eh_defer_cmd(cmd);
681 continue;
682 case TASK_IS_ABORTED:
683 SAS_DPRINTK("%s: task 0x%p is aborted\n",
684 __func__, task);
685 sas_eh_defer_cmd(cmd);
686 continue;
687 case TASK_IS_AT_LU:
688 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
689 reset:
690 tmf_resp = sas_recover_lu(task->dev, cmd);
691 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
692 SAS_DPRINTK("dev %016llx LU %x is "
693 "recovered\n",
694 SAS_ADDR(task->dev),
695 cmd->device->lun);
696 sas_eh_defer_cmd(cmd);
697 sas_scsi_clear_queue_lu(work_q, cmd);
698 goto Again;
699 }
700
701 case TASK_IS_NOT_AT_LU:
702 case TASK_ABORT_FAILED:
703 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
704 task);
705 tmf_resp = sas_recover_I_T(task->dev);
706 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
707 tmf_resp == -ENODEV) {
708 struct domain_device *dev = task->dev;
709 SAS_DPRINTK("I_T %016llx recovered\n",
710 SAS_ADDR(task->dev->sas_addr));
711 sas_eh_finish_cmd(cmd);
712 sas_scsi_clear_queue_I_T(work_q, dev);
713 goto Again;
714 }
715
716 try_to_reset_cmd_device(cmd);
717 if (i->dft->lldd_clear_nexus_port) {
718 struct asd_sas_port *port = task->dev->port;
719 SAS_DPRINTK("clearing nexus for port:%d\n",
720 port->id);
721 res = i->dft->lldd_clear_nexus_port(port);
722 if (res == TMF_RESP_FUNC_COMPLETE) {
723 SAS_DPRINTK("clear nexus port:%d "
724 "succeeded\n", port->id);
725 sas_eh_finish_cmd(cmd);
726 sas_scsi_clear_queue_port(work_q,
727 port);
728 goto Again;
729 }
730 }
731 if (i->dft->lldd_clear_nexus_ha) {
732 SAS_DPRINTK("clear nexus ha\n");
733 res = i->dft->lldd_clear_nexus_ha(ha);
734 if (res == TMF_RESP_FUNC_COMPLETE) {
735 SAS_DPRINTK("clear nexus ha "
736 "succeeded\n");
737 sas_eh_finish_cmd(cmd);
738 goto clear_q;
739 }
740 }
741
742
743
744
745 SAS_DPRINTK("error from device %llx, LUN %x "
746 "couldn't be recovered in any way\n",
747 SAS_ADDR(task->dev->sas_addr),
748 cmd->device->lun);
749
750 sas_eh_finish_cmd(cmd);
751 goto clear_q;
752 }
753 }
754 out:
755 list_splice_tail(&done, work_q);
756 list_splice_tail_init(&ha->eh_ata_q, work_q);
757 return;
758
759 clear_q:
760 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
761 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
762 sas_eh_finish_cmd(cmd);
763 goto out;
764}
765
766static void sas_eh_handle_resets(struct Scsi_Host *shost)
767{
768 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
769 struct sas_internal *i = to_sas_internal(shost->transportt);
770
771
772 spin_lock_irq(&ha->lock);
773 while (!list_empty(&ha->eh_dev_q)) {
774 struct domain_device *dev;
775 struct ssp_device *ssp;
776
777 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
778 list_del_init(&ssp->eh_list_node);
779 dev = container_of(ssp, typeof(*dev), ssp_dev);
780 kref_get(&dev->kref);
781 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
782
783 spin_unlock_irq(&ha->lock);
784
785 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
786 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
787
788 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
789 i->dft->lldd_I_T_nexus_reset(dev);
790
791 sas_put_device(dev);
792 spin_lock_irq(&ha->lock);
793 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
794 ha->eh_active--;
795 }
796 spin_unlock_irq(&ha->lock);
797}
798
799
800void sas_scsi_recover_host(struct Scsi_Host *shost)
801{
802 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
803 LIST_HEAD(eh_work_q);
804 int tries = 0;
805 bool retry;
806
807retry:
808 tries++;
809 retry = true;
810 spin_lock_irq(shost->host_lock);
811 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
812 spin_unlock_irq(shost->host_lock);
813
814 SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
815 __func__, shost->host_busy, shost->host_failed);
816
817
818
819
820
821 set_bit(SAS_HA_FROZEN, &ha->state);
822 sas_eh_handle_sas_errors(shost, &eh_work_q);
823 clear_bit(SAS_HA_FROZEN, &ha->state);
824 if (list_empty(&eh_work_q))
825 goto out;
826
827
828
829
830
831
832
833 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
834 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
835 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
836
837out:
838 if (ha->lldd_max_execute_num > 1)
839 wake_up_process(ha->core.queue_thread);
840
841 sas_eh_handle_resets(shost);
842
843
844 sas_ata_strategy_handler(shost);
845
846 scsi_eh_flush_done_q(&ha->eh_done_q);
847
848
849 spin_lock_irq(&ha->lock);
850 if (ha->eh_active == 0) {
851 shost->host_eh_scheduled = 0;
852 retry = false;
853 }
854 spin_unlock_irq(&ha->lock);
855
856 if (retry)
857 goto retry;
858
859 SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
860 __func__, shost->host_busy, shost->host_failed, tries);
861}
862
863enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
864{
865 scmd_dbg(cmd, "command %p timed out\n", cmd);
866
867 return BLK_EH_NOT_HANDLED;
868}
869
870int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
871{
872 struct domain_device *dev = sdev_to_domain_dev(sdev);
873
874 if (dev_is_sata(dev))
875 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
876
877 return -EINVAL;
878}
879
880struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
881{
882 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
883 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
884 struct domain_device *found_dev = NULL;
885 int i;
886 unsigned long flags;
887
888 spin_lock_irqsave(&ha->phy_port_lock, flags);
889 for (i = 0; i < ha->num_phys; i++) {
890 struct asd_sas_port *port = ha->sas_port[i];
891 struct domain_device *dev;
892
893 spin_lock(&port->dev_list_lock);
894 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
895 if (rphy == dev->rphy) {
896 found_dev = dev;
897 spin_unlock(&port->dev_list_lock);
898 goto found;
899 }
900 }
901 spin_unlock(&port->dev_list_lock);
902 }
903 found:
904 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
905
906 return found_dev;
907}
908
909int sas_target_alloc(struct scsi_target *starget)
910{
911 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
912 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
913
914 if (!found_dev)
915 return -ENODEV;
916
917 kref_get(&found_dev->kref);
918 starget->hostdata = found_dev;
919 return 0;
920}
921
922#define SAS_DEF_QD 256
923
924int sas_slave_configure(struct scsi_device *scsi_dev)
925{
926 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
927 struct sas_ha_struct *sas_ha;
928
929 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
930
931 if (dev_is_sata(dev)) {
932 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
933 return 0;
934 }
935
936 sas_ha = dev->port->ha;
937
938 sas_read_port_mode_page(scsi_dev);
939
940 if (scsi_dev->tagged_supported) {
941 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
942 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
943 } else {
944 SAS_DPRINTK("device %llx, LUN %x doesn't support "
945 "TCQ\n", SAS_ADDR(dev->sas_addr),
946 scsi_dev->lun);
947 scsi_dev->tagged_supported = 0;
948 scsi_set_tag_type(scsi_dev, 0);
949 scsi_deactivate_tcq(scsi_dev, 1);
950 }
951
952 scsi_dev->allow_restart = 1;
953
954 return 0;
955}
956
957int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
958{
959 struct domain_device *dev = sdev_to_domain_dev(sdev);
960
961 if (dev_is_sata(dev))
962 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
963 reason);
964
965 switch (reason) {
966 case SCSI_QDEPTH_DEFAULT:
967 case SCSI_QDEPTH_RAMP_UP:
968 if (!sdev->tagged_supported)
969 depth = 1;
970 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
971 break;
972 case SCSI_QDEPTH_QFULL:
973 scsi_track_queue_full(sdev, depth);
974 break;
975 default:
976 return -EOPNOTSUPP;
977 }
978
979 return depth;
980}
981
982int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
983{
984 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
985
986 if (dev_is_sata(dev))
987 return -EINVAL;
988
989 if (!scsi_dev->tagged_supported)
990 return 0;
991
992 scsi_deactivate_tcq(scsi_dev, 1);
993
994 scsi_set_tag_type(scsi_dev, qt);
995 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
996
997 return qt;
998}
999
1000int sas_bios_param(struct scsi_device *scsi_dev,
1001 struct block_device *bdev,
1002 sector_t capacity, int *hsc)
1003{
1004 hsc[0] = 255;
1005 hsc[1] = 63;
1006 sector_div(capacity, 255*63);
1007 hsc[2] = capacity;
1008
1009 return 0;
1010}
1011
1012
1013
1014static void sas_queue(struct sas_ha_struct *sas_ha)
1015{
1016 struct scsi_core *core = &sas_ha->core;
1017 unsigned long flags;
1018 LIST_HEAD(q);
1019 int can_queue;
1020 int res;
1021 struct sas_internal *i = to_sas_internal(core->shost->transportt);
1022
1023 mutex_lock(&core->task_queue_flush);
1024 spin_lock_irqsave(&core->task_queue_lock, flags);
1025 while (!kthread_should_stop() &&
1026 !list_empty(&core->task_queue) &&
1027 !test_bit(SAS_HA_FROZEN, &sas_ha->state)) {
1028
1029 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
1030 if (can_queue >= 0) {
1031 can_queue = core->task_queue_size;
1032 list_splice_init(&core->task_queue, &q);
1033 } else {
1034 struct list_head *a, *n;
1035
1036 can_queue = sas_ha->lldd_queue_size;
1037 list_for_each_safe(a, n, &core->task_queue) {
1038 list_move_tail(a, &q);
1039 if (--can_queue == 0)
1040 break;
1041 }
1042 can_queue = sas_ha->lldd_queue_size;
1043 }
1044 core->task_queue_size -= can_queue;
1045 spin_unlock_irqrestore(&core->task_queue_lock, flags);
1046 {
1047 struct sas_task *task = list_entry(q.next,
1048 struct sas_task,
1049 list);
1050 list_del_init(&q);
1051 res = i->dft->lldd_execute_task(task, can_queue,
1052 GFP_KERNEL);
1053 if (unlikely(res))
1054 __list_add(&q, task->list.prev, &task->list);
1055 }
1056 spin_lock_irqsave(&core->task_queue_lock, flags);
1057 if (res) {
1058 list_splice_init(&q, &core->task_queue);
1059 core->task_queue_size += can_queue;
1060 }
1061 }
1062 spin_unlock_irqrestore(&core->task_queue_lock, flags);
1063 mutex_unlock(&core->task_queue_flush);
1064}
1065
1066
1067
1068
1069
1070static int sas_queue_thread(void *_sas_ha)
1071{
1072 struct sas_ha_struct *sas_ha = _sas_ha;
1073
1074 while (1) {
1075 set_current_state(TASK_INTERRUPTIBLE);
1076 schedule();
1077 sas_queue(sas_ha);
1078 if (kthread_should_stop())
1079 break;
1080 }
1081
1082 return 0;
1083}
1084
1085int sas_init_queue(struct sas_ha_struct *sas_ha)
1086{
1087 struct scsi_core *core = &sas_ha->core;
1088
1089 spin_lock_init(&core->task_queue_lock);
1090 mutex_init(&core->task_queue_flush);
1091 core->task_queue_size = 0;
1092 INIT_LIST_HEAD(&core->task_queue);
1093
1094 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
1095 "sas_queue_%d", core->shost->host_no);
1096 if (IS_ERR(core->queue_thread))
1097 return PTR_ERR(core->queue_thread);
1098 return 0;
1099}
1100
1101void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
1102{
1103 unsigned long flags;
1104 struct scsi_core *core = &sas_ha->core;
1105 struct sas_task *task, *n;
1106
1107 kthread_stop(core->queue_thread);
1108
1109 if (!list_empty(&core->task_queue))
1110 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
1111 SAS_ADDR(sas_ha->sas_addr));
1112
1113 spin_lock_irqsave(&core->task_queue_lock, flags);
1114 list_for_each_entry_safe(task, n, &core->task_queue, list) {
1115 struct scsi_cmnd *cmd = task->uldd_task;
1116
1117 list_del_init(&task->list);
1118
1119 ASSIGN_SAS_TASK(cmd, NULL);
1120 sas_free_task(task);
1121 cmd->result = DID_ABORT << 16;
1122 cmd->scsi_done(cmd);
1123 }
1124 spin_unlock_irqrestore(&core->task_queue_lock, flags);
1125}
1126
1127
1128
1129
1130
1131void sas_task_abort(struct sas_task *task)
1132{
1133 struct scsi_cmnd *sc = task->uldd_task;
1134
1135
1136 if (!sc) {
1137 struct sas_task_slow *slow = task->slow_task;
1138
1139 if (!slow)
1140 return;
1141 if (!del_timer(&slow->timer))
1142 return;
1143 slow->timer.function(slow->timer.data);
1144 return;
1145 }
1146
1147 if (dev_is_sata(task->dev)) {
1148 sas_ata_task_abort(task);
1149 } else {
1150 struct request_queue *q = sc->device->request_queue;
1151 unsigned long flags;
1152
1153 spin_lock_irqsave(q->queue_lock, flags);
1154 blk_abort_request(sc->request);
1155 spin_unlock_irqrestore(q->queue_lock, flags);
1156 }
1157}
1158
1159void sas_target_destroy(struct scsi_target *starget)
1160{
1161 struct domain_device *found_dev = starget->hostdata;
1162
1163 if (!found_dev)
1164 return;
1165
1166 starget->hostdata = NULL;
1167 sas_put_device(found_dev);
1168}
1169
1170static void sas_parse_addr(u8 *sas_addr, const char *p)
1171{
1172 int i;
1173 for (i = 0; i < SAS_ADDR_SIZE; i++) {
1174 u8 h, l;
1175 if (!*p)
1176 break;
1177 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1178 p++;
1179 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1180 p++;
1181 sas_addr[i] = (h<<4) | l;
1182 }
1183}
1184
1185#define SAS_STRING_ADDR_SIZE 16
1186
1187int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1188{
1189 int res;
1190 const struct firmware *fw;
1191
1192 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1193 if (res)
1194 return res;
1195
1196 if (fw->size < SAS_STRING_ADDR_SIZE) {
1197 res = -ENODEV;
1198 goto out;
1199 }
1200
1201 sas_parse_addr(addr, fw->data);
1202
1203out:
1204 release_firmware(fw);
1205 return res;
1206}
1207EXPORT_SYMBOL_GPL(sas_request_addr);
1208
1209EXPORT_SYMBOL_GPL(sas_queuecommand);
1210EXPORT_SYMBOL_GPL(sas_target_alloc);
1211EXPORT_SYMBOL_GPL(sas_slave_configure);
1212EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1213EXPORT_SYMBOL_GPL(sas_change_queue_type);
1214EXPORT_SYMBOL_GPL(sas_bios_param);
1215EXPORT_SYMBOL_GPL(sas_task_abort);
1216EXPORT_SYMBOL_GPL(sas_phy_reset);
1217EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1218EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1219EXPORT_SYMBOL_GPL(sas_target_destroy);
1220EXPORT_SYMBOL_GPL(sas_ioctl);
1221
