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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Serial Attached SCSI (SAS) class SCSI Host glue.
4 *
5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 */
8
9#include <linux/kthread.h>
10#include <linux/firmware.h>
11#include <linux/export.h>
12#include <linux/ctype.h>
13#include <linux/kernel.h>
14
15#include "sas_internal.h"
16
17#include <scsi/scsi_host.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_tcq.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_eh.h>
22#include <scsi/scsi_transport.h>
23#include <scsi/scsi_transport_sas.h>
24#include <scsi/sas_ata.h>
25#include "scsi_sas_internal.h"
26#include "scsi_transport_api.h"
27#include "scsi_priv.h"
28
29#include <linux/err.h>
30#include <linux/blkdev.h>
31#include <linux/freezer.h>
32#include <linux/gfp.h>
33#include <linux/scatterlist.h>
34#include <linux/libata.h>
35
36/* record final status and free the task */
37static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
38{
39 struct task_status_struct *ts = &task->task_status;
40 enum scsi_host_status hs = DID_OK;
41 enum exec_status stat = SAS_SAM_STAT_GOOD;
42
43 if (ts->resp == SAS_TASK_UNDELIVERED) {
44 /* transport error */
45 hs = DID_NO_CONNECT;
46 } else { /* ts->resp == SAS_TASK_COMPLETE */
47 /* task delivered, what happened afterwards? */
48 switch (ts->stat) {
49 case SAS_DEV_NO_RESPONSE:
50 case SAS_INTERRUPTED:
51 case SAS_PHY_DOWN:
52 case SAS_NAK_R_ERR:
53 case SAS_OPEN_TO:
54 hs = DID_NO_CONNECT;
55 break;
56 case SAS_DATA_UNDERRUN:
57 scsi_set_resid(sc, ts->residual);
58 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
59 hs = DID_ERROR;
60 break;
61 case SAS_DATA_OVERRUN:
62 hs = DID_ERROR;
63 break;
64 case SAS_QUEUE_FULL:
65 hs = DID_SOFT_ERROR; /* retry */
66 break;
67 case SAS_DEVICE_UNKNOWN:
68 hs = DID_BAD_TARGET;
69 break;
70 case SAS_OPEN_REJECT:
71 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
72 hs = DID_SOFT_ERROR; /* retry */
73 else
74 hs = DID_ERROR;
75 break;
76 case SAS_PROTO_RESPONSE:
77 pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP task; please report this\n",
78 task->dev->port->ha->sas_ha_name);
79 break;
80 case SAS_ABORTED_TASK:
81 hs = DID_ABORT;
82 break;
83 case SAS_SAM_STAT_CHECK_CONDITION:
84 memcpy(sc->sense_buffer, ts->buf,
85 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
86 stat = SAS_SAM_STAT_CHECK_CONDITION;
87 break;
88 default:
89 stat = ts->stat;
90 break;
91 }
92 }
93
94 sc->result = (hs << 16) | stat;
95 ASSIGN_SAS_TASK(sc, NULL);
96 sas_free_task(task);
97}
98
99static void sas_scsi_task_done(struct sas_task *task)
100{
101 struct scsi_cmnd *sc = task->uldd_task;
102 struct domain_device *dev = task->dev;
103 struct sas_ha_struct *ha = dev->port->ha;
104 unsigned long flags;
105
106 spin_lock_irqsave(&dev->done_lock, flags);
107 if (test_bit(SAS_HA_FROZEN, &ha->state))
108 task = NULL;
109 else
110 ASSIGN_SAS_TASK(sc, NULL);
111 spin_unlock_irqrestore(&dev->done_lock, flags);
112
113 if (unlikely(!task)) {
114 /* task will be completed by the error handler */
115 pr_debug("task done but aborted\n");
116 return;
117 }
118
119 if (unlikely(!sc)) {
120 pr_debug("task_done called with non existing SCSI cmnd!\n");
121 sas_free_task(task);
122 return;
123 }
124
125 sas_end_task(sc, task);
126 scsi_done(sc);
127}
128
129static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
130 struct domain_device *dev,
131 gfp_t gfp_flags)
132{
133 struct sas_task *task = sas_alloc_task(gfp_flags);
134 struct scsi_lun lun;
135
136 if (!task)
137 return NULL;
138
139 task->uldd_task = cmd;
140 ASSIGN_SAS_TASK(cmd, task);
141
142 task->dev = dev;
143 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
144
145 int_to_scsilun(cmd->device->lun, &lun);
146 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
147 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
148 task->ssp_task.cmd = cmd;
149
150 task->scatter = scsi_sglist(cmd);
151 task->num_scatter = scsi_sg_count(cmd);
152 task->total_xfer_len = scsi_bufflen(cmd);
153 task->data_dir = cmd->sc_data_direction;
154
155 task->task_done = sas_scsi_task_done;
156
157 return task;
158}
159
160int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
161{
162 struct sas_internal *i = to_sas_internal(host->transportt);
163 struct domain_device *dev = cmd_to_domain_dev(cmd);
164 struct sas_task *task;
165 int res = 0;
166
167 /* If the device fell off, no sense in issuing commands */
168 if (test_bit(SAS_DEV_GONE, &dev->state)) {
169 cmd->result = DID_BAD_TARGET << 16;
170 goto out_done;
171 }
172
173 if (dev_is_sata(dev)) {
174 spin_lock_irq(dev->sata_dev.ap->lock);
175 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
176 spin_unlock_irq(dev->sata_dev.ap->lock);
177 return res;
178 }
179
180 task = sas_create_task(cmd, dev, GFP_ATOMIC);
181 if (!task)
182 return SCSI_MLQUEUE_HOST_BUSY;
183
184 res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
185 if (res)
186 goto out_free_task;
187 return 0;
188
189out_free_task:
190 pr_debug("lldd_execute_task returned: %d\n", res);
191 ASSIGN_SAS_TASK(cmd, NULL);
192 sas_free_task(task);
193 if (res == -SAS_QUEUE_FULL)
194 cmd->result = DID_SOFT_ERROR << 16; /* retry */
195 else
196 cmd->result = DID_ERROR << 16;
197out_done:
198 scsi_done(cmd);
199 return 0;
200}
201EXPORT_SYMBOL_GPL(sas_queuecommand);
202
203static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
204{
205 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
206 struct domain_device *dev = cmd_to_domain_dev(cmd);
207 struct sas_task *task = TO_SAS_TASK(cmd);
208
209 /* At this point, we only get called following an actual abort
210 * of the task, so we should be guaranteed not to be racing with
211 * any completions from the LLD. Task is freed after this.
212 */
213 sas_end_task(cmd, task);
214
215 if (dev_is_sata(dev)) {
216 /* defer commands to libata so that libata EH can
217 * handle ata qcs correctly
218 */
219 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
220 return;
221 }
222
223 /* now finish the command and move it on to the error
224 * handler done list, this also takes it off the
225 * error handler pending list.
226 */
227 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
228}
229
230static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
231{
232 struct scsi_cmnd *cmd, *n;
233
234 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
235 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
236 cmd->device->lun == my_cmd->device->lun)
237 sas_eh_finish_cmd(cmd);
238 }
239}
240
241static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
242 struct domain_device *dev)
243{
244 struct scsi_cmnd *cmd, *n;
245
246 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
247 struct domain_device *x = cmd_to_domain_dev(cmd);
248
249 if (x == dev)
250 sas_eh_finish_cmd(cmd);
251 }
252}
253
254static void sas_scsi_clear_queue_port(struct list_head *error_q,
255 struct asd_sas_port *port)
256{
257 struct scsi_cmnd *cmd, *n;
258
259 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
260 struct domain_device *dev = cmd_to_domain_dev(cmd);
261 struct asd_sas_port *x = dev->port;
262
263 if (x == port)
264 sas_eh_finish_cmd(cmd);
265 }
266}
267
268enum task_disposition {
269 TASK_IS_DONE,
270 TASK_IS_ABORTED,
271 TASK_IS_AT_LU,
272 TASK_IS_NOT_AT_LU,
273 TASK_ABORT_FAILED,
274};
275
276static enum task_disposition sas_scsi_find_task(struct sas_task *task)
277{
278 unsigned long flags;
279 int i, res;
280 struct sas_internal *si =
281 to_sas_internal(task->dev->port->ha->shost->transportt);
282
283 for (i = 0; i < 5; i++) {
284 pr_notice("%s: aborting task 0x%p\n", __func__, task);
285 res = si->dft->lldd_abort_task(task);
286
287 spin_lock_irqsave(&task->task_state_lock, flags);
288 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
289 spin_unlock_irqrestore(&task->task_state_lock, flags);
290 pr_debug("%s: task 0x%p is done\n", __func__, task);
291 return TASK_IS_DONE;
292 }
293 spin_unlock_irqrestore(&task->task_state_lock, flags);
294
295 if (res == TMF_RESP_FUNC_COMPLETE) {
296 pr_notice("%s: task 0x%p is aborted\n",
297 __func__, task);
298 return TASK_IS_ABORTED;
299 } else if (si->dft->lldd_query_task) {
300 pr_notice("%s: querying task 0x%p\n", __func__, task);
301 res = si->dft->lldd_query_task(task);
302 switch (res) {
303 case TMF_RESP_FUNC_SUCC:
304 pr_notice("%s: task 0x%p at LU\n", __func__,
305 task);
306 return TASK_IS_AT_LU;
307 case TMF_RESP_FUNC_COMPLETE:
308 pr_notice("%s: task 0x%p not at LU\n",
309 __func__, task);
310 return TASK_IS_NOT_AT_LU;
311 case TMF_RESP_FUNC_FAILED:
312 pr_notice("%s: task 0x%p failed to abort\n",
313 __func__, task);
314 return TASK_ABORT_FAILED;
315 default:
316 pr_notice("%s: task 0x%p result code %d not handled\n",
317 __func__, task, res);
318 }
319 }
320 }
321 return TASK_ABORT_FAILED;
322}
323
324static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
325{
326 int res = TMF_RESP_FUNC_FAILED;
327 struct scsi_lun lun;
328 struct sas_internal *i =
329 to_sas_internal(dev->port->ha->shost->transportt);
330
331 int_to_scsilun(cmd->device->lun, &lun);
332
333 pr_notice("eh: device %016llx LUN 0x%llx has the task\n",
334 SAS_ADDR(dev->sas_addr),
335 cmd->device->lun);
336
337 if (i->dft->lldd_abort_task_set)
338 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
339
340 if (res == TMF_RESP_FUNC_FAILED) {
341 if (i->dft->lldd_clear_task_set)
342 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
343 }
344
345 if (res == TMF_RESP_FUNC_FAILED) {
346 if (i->dft->lldd_lu_reset)
347 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
348 }
349
350 return res;
351}
352
353static int sas_recover_I_T(struct domain_device *dev)
354{
355 int res = TMF_RESP_FUNC_FAILED;
356 struct sas_internal *i =
357 to_sas_internal(dev->port->ha->shost->transportt);
358
359 pr_notice("I_T nexus reset for dev %016llx\n",
360 SAS_ADDR(dev->sas_addr));
361
362 if (i->dft->lldd_I_T_nexus_reset)
363 res = i->dft->lldd_I_T_nexus_reset(dev);
364
365 return res;
366}
367
368/* take a reference on the last known good phy for this device */
369struct sas_phy *sas_get_local_phy(struct domain_device *dev)
370{
371 struct sas_ha_struct *ha = dev->port->ha;
372 struct sas_phy *phy;
373 unsigned long flags;
374
375 /* a published domain device always has a valid phy, it may be
376 * stale, but it is never NULL
377 */
378 BUG_ON(!dev->phy);
379
380 spin_lock_irqsave(&ha->phy_port_lock, flags);
381 phy = dev->phy;
382 get_device(&phy->dev);
383 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
384
385 return phy;
386}
387EXPORT_SYMBOL_GPL(sas_get_local_phy);
388
389static int sas_queue_reset(struct domain_device *dev, int reset_type, u64 lun)
390{
391 struct sas_ha_struct *ha = dev->port->ha;
392 int scheduled = 0, tries = 100;
393
394 /* ata: promote lun reset to bus reset */
395 if (dev_is_sata(dev)) {
396 sas_ata_schedule_reset(dev);
397 return SUCCESS;
398 }
399
400 while (!scheduled && tries--) {
401 spin_lock_irq(&ha->lock);
402 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
403 !test_bit(reset_type, &dev->state)) {
404 scheduled = 1;
405 ha->eh_active++;
406 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
407 set_bit(SAS_DEV_EH_PENDING, &dev->state);
408 set_bit(reset_type, &dev->state);
409 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
410 scsi_schedule_eh(ha->shost);
411 }
412 spin_unlock_irq(&ha->lock);
413
414 if (scheduled)
415 return SUCCESS;
416 }
417
418 pr_warn("%s reset of %s failed\n",
419 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
420 dev_name(&dev->rphy->dev));
421
422 return FAILED;
423}
424
425int sas_eh_abort_handler(struct scsi_cmnd *cmd)
426{
427 int res = TMF_RESP_FUNC_FAILED;
428 struct sas_task *task = TO_SAS_TASK(cmd);
429 struct Scsi_Host *host = cmd->device->host;
430 struct domain_device *dev = cmd_to_domain_dev(cmd);
431 struct sas_internal *i = to_sas_internal(host->transportt);
432 unsigned long flags;
433
434 if (!i->dft->lldd_abort_task)
435 return FAILED;
436
437 spin_lock_irqsave(host->host_lock, flags);
438 /* We cannot do async aborts for SATA devices */
439 if (dev_is_sata(dev) && !host->host_eh_scheduled) {
440 spin_unlock_irqrestore(host->host_lock, flags);
441 return FAILED;
442 }
443 spin_unlock_irqrestore(host->host_lock, flags);
444
445 if (task)
446 res = i->dft->lldd_abort_task(task);
447 else
448 pr_notice("no task to abort\n");
449 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
450 return SUCCESS;
451
452 return FAILED;
453}
454EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
455
456/* Attempt to send a LUN reset message to a device */
457int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
458{
459 int res;
460 struct scsi_lun lun;
461 struct Scsi_Host *host = cmd->device->host;
462 struct domain_device *dev = cmd_to_domain_dev(cmd);
463 struct sas_internal *i = to_sas_internal(host->transportt);
464
465 if (current != host->ehandler)
466 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun);
467
468 int_to_scsilun(cmd->device->lun, &lun);
469
470 if (!i->dft->lldd_lu_reset)
471 return FAILED;
472
473 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
474 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
475 return SUCCESS;
476
477 return FAILED;
478}
479EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
480
481int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
482{
483 int res;
484 struct Scsi_Host *host = cmd->device->host;
485 struct domain_device *dev = cmd_to_domain_dev(cmd);
486 struct sas_internal *i = to_sas_internal(host->transportt);
487
488 if (current != host->ehandler)
489 return sas_queue_reset(dev, SAS_DEV_RESET, 0);
490
491 if (!i->dft->lldd_I_T_nexus_reset)
492 return FAILED;
493
494 res = i->dft->lldd_I_T_nexus_reset(dev);
495 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
496 res == -ENODEV)
497 return SUCCESS;
498
499 return FAILED;
500}
501EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
502
503/* Try to reset a device */
504static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
505{
506 int res;
507 struct Scsi_Host *shost = cmd->device->host;
508
509 if (!shost->hostt->eh_device_reset_handler)
510 goto try_target_reset;
511
512 res = shost->hostt->eh_device_reset_handler(cmd);
513 if (res == SUCCESS)
514 return res;
515
516try_target_reset:
517 if (shost->hostt->eh_target_reset_handler)
518 return shost->hostt->eh_target_reset_handler(cmd);
519
520 return FAILED;
521}
522
523static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
524{
525 struct scsi_cmnd *cmd, *n;
526 enum task_disposition res = TASK_IS_DONE;
527 int tmf_resp, need_reset;
528 struct sas_internal *i = to_sas_internal(shost->transportt);
529 unsigned long flags;
530 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
531 LIST_HEAD(done);
532
533 /* clean out any commands that won the completion vs eh race */
534 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
535 struct domain_device *dev = cmd_to_domain_dev(cmd);
536 struct sas_task *task;
537
538 spin_lock_irqsave(&dev->done_lock, flags);
539 /* by this point the lldd has either observed
540 * SAS_HA_FROZEN and is leaving the task alone, or has
541 * won the race with eh and decided to complete it
542 */
543 task = TO_SAS_TASK(cmd);
544 spin_unlock_irqrestore(&dev->done_lock, flags);
545
546 if (!task)
547 list_move_tail(&cmd->eh_entry, &done);
548 }
549
550 Again:
551 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
552 struct sas_task *task = TO_SAS_TASK(cmd);
553
554 list_del_init(&cmd->eh_entry);
555
556 spin_lock_irqsave(&task->task_state_lock, flags);
557 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
558 spin_unlock_irqrestore(&task->task_state_lock, flags);
559
560 if (need_reset) {
561 pr_notice("%s: task 0x%p requests reset\n",
562 __func__, task);
563 goto reset;
564 }
565
566 pr_debug("trying to find task 0x%p\n", task);
567 res = sas_scsi_find_task(task);
568
569 switch (res) {
570 case TASK_IS_DONE:
571 pr_notice("%s: task 0x%p is done\n", __func__,
572 task);
573 sas_eh_finish_cmd(cmd);
574 continue;
575 case TASK_IS_ABORTED:
576 pr_notice("%s: task 0x%p is aborted\n",
577 __func__, task);
578 sas_eh_finish_cmd(cmd);
579 continue;
580 case TASK_IS_AT_LU:
581 pr_info("task 0x%p is at LU: lu recover\n", task);
582 reset:
583 tmf_resp = sas_recover_lu(task->dev, cmd);
584 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
585 pr_notice("dev %016llx LU 0x%llx is recovered\n",
586 SAS_ADDR(task->dev),
587 cmd->device->lun);
588 sas_eh_finish_cmd(cmd);
589 sas_scsi_clear_queue_lu(work_q, cmd);
590 goto Again;
591 }
592 fallthrough;
593 case TASK_IS_NOT_AT_LU:
594 case TASK_ABORT_FAILED:
595 pr_notice("task 0x%p is not at LU: I_T recover\n",
596 task);
597 tmf_resp = sas_recover_I_T(task->dev);
598 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
599 tmf_resp == -ENODEV) {
600 struct domain_device *dev = task->dev;
601 pr_notice("I_T %016llx recovered\n",
602 SAS_ADDR(task->dev->sas_addr));
603 sas_eh_finish_cmd(cmd);
604 sas_scsi_clear_queue_I_T(work_q, dev);
605 goto Again;
606 }
607 /* Hammer time :-) */
608 try_to_reset_cmd_device(cmd);
609 if (i->dft->lldd_clear_nexus_port) {
610 struct asd_sas_port *port = task->dev->port;
611 pr_debug("clearing nexus for port:%d\n",
612 port->id);
613 res = i->dft->lldd_clear_nexus_port(port);
614 if (res == TMF_RESP_FUNC_COMPLETE) {
615 pr_notice("clear nexus port:%d succeeded\n",
616 port->id);
617 sas_eh_finish_cmd(cmd);
618 sas_scsi_clear_queue_port(work_q,
619 port);
620 goto Again;
621 }
622 }
623 if (i->dft->lldd_clear_nexus_ha) {
624 pr_debug("clear nexus ha\n");
625 res = i->dft->lldd_clear_nexus_ha(ha);
626 if (res == TMF_RESP_FUNC_COMPLETE) {
627 pr_notice("clear nexus ha succeeded\n");
628 sas_eh_finish_cmd(cmd);
629 goto clear_q;
630 }
631 }
632 /* If we are here -- this means that no amount
633 * of effort could recover from errors. Quite
634 * possibly the HA just disappeared.
635 */
636 pr_err("error from device %016llx, LUN 0x%llx couldn't be recovered in any way\n",
637 SAS_ADDR(task->dev->sas_addr),
638 cmd->device->lun);
639
640 sas_eh_finish_cmd(cmd);
641 goto clear_q;
642 }
643 }
644 out:
645 list_splice_tail(&done, work_q);
646 list_splice_tail_init(&ha->eh_ata_q, work_q);
647 return;
648
649 clear_q:
650 pr_debug("--- Exit %s -- clear_q\n", __func__);
651 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
652 sas_eh_finish_cmd(cmd);
653 goto out;
654}
655
656static void sas_eh_handle_resets(struct Scsi_Host *shost)
657{
658 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
659 struct sas_internal *i = to_sas_internal(shost->transportt);
660
661 /* handle directed resets to sas devices */
662 spin_lock_irq(&ha->lock);
663 while (!list_empty(&ha->eh_dev_q)) {
664 struct domain_device *dev;
665 struct ssp_device *ssp;
666
667 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
668 list_del_init(&ssp->eh_list_node);
669 dev = container_of(ssp, typeof(*dev), ssp_dev);
670 kref_get(&dev->kref);
671 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
672
673 spin_unlock_irq(&ha->lock);
674
675 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
676 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
677
678 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
679 i->dft->lldd_I_T_nexus_reset(dev);
680
681 sas_put_device(dev);
682 spin_lock_irq(&ha->lock);
683 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
684 ha->eh_active--;
685 }
686 spin_unlock_irq(&ha->lock);
687}
688
689
690void sas_scsi_recover_host(struct Scsi_Host *shost)
691{
692 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
693 LIST_HEAD(eh_work_q);
694 int tries = 0;
695 bool retry;
696
697retry:
698 tries++;
699 retry = true;
700 spin_lock_irq(shost->host_lock);
701 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
702 spin_unlock_irq(shost->host_lock);
703
704 pr_notice("Enter %s busy: %d failed: %d\n",
705 __func__, scsi_host_busy(shost), shost->host_failed);
706 /*
707 * Deal with commands that still have SAS tasks (i.e. they didn't
708 * complete via the normal sas_task completion mechanism),
709 * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
710 */
711 set_bit(SAS_HA_FROZEN, &ha->state);
712 sas_eh_handle_sas_errors(shost, &eh_work_q);
713 clear_bit(SAS_HA_FROZEN, &ha->state);
714 if (list_empty(&eh_work_q))
715 goto out;
716
717 /*
718 * Now deal with SCSI commands that completed ok but have a an error
719 * code (and hopefully sense data) attached. This is roughly what
720 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
721 * command we see here has no sas_task and is thus unknown to the HA.
722 */
723 sas_ata_eh(shost, &eh_work_q);
724 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
725 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
726
727out:
728 sas_eh_handle_resets(shost);
729
730 /* now link into libata eh --- if we have any ata devices */
731 sas_ata_strategy_handler(shost);
732
733 scsi_eh_flush_done_q(&ha->eh_done_q);
734
735 /* check if any new eh work was scheduled during the last run */
736 spin_lock_irq(&ha->lock);
737 if (ha->eh_active == 0) {
738 shost->host_eh_scheduled = 0;
739 retry = false;
740 }
741 spin_unlock_irq(&ha->lock);
742
743 if (retry)
744 goto retry;
745
746 pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n",
747 __func__, scsi_host_busy(shost),
748 shost->host_failed, tries);
749}
750
751int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
752{
753 struct domain_device *dev = sdev_to_domain_dev(sdev);
754
755 if (dev_is_sata(dev))
756 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
757
758 return -EINVAL;
759}
760EXPORT_SYMBOL_GPL(sas_ioctl);
761
762struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
763{
764 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
765 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
766 struct domain_device *found_dev = NULL;
767 int i;
768 unsigned long flags;
769
770 spin_lock_irqsave(&ha->phy_port_lock, flags);
771 for (i = 0; i < ha->num_phys; i++) {
772 struct asd_sas_port *port = ha->sas_port[i];
773 struct domain_device *dev;
774
775 spin_lock(&port->dev_list_lock);
776 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
777 if (rphy == dev->rphy) {
778 found_dev = dev;
779 spin_unlock(&port->dev_list_lock);
780 goto found;
781 }
782 }
783 spin_unlock(&port->dev_list_lock);
784 }
785 found:
786 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
787
788 return found_dev;
789}
790
791int sas_target_alloc(struct scsi_target *starget)
792{
793 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
794 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
795
796 if (!found_dev)
797 return -ENODEV;
798
799 kref_get(&found_dev->kref);
800 starget->hostdata = found_dev;
801 return 0;
802}
803EXPORT_SYMBOL_GPL(sas_target_alloc);
804
805#define SAS_DEF_QD 256
806
807int sas_slave_configure(struct scsi_device *scsi_dev)
808{
809 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
810
811 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
812
813 if (dev_is_sata(dev)) {
814 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
815 return 0;
816 }
817
818 sas_read_port_mode_page(scsi_dev);
819
820 if (scsi_dev->tagged_supported) {
821 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
822 } else {
823 pr_notice("device %016llx, LUN 0x%llx doesn't support TCQ\n",
824 SAS_ADDR(dev->sas_addr), scsi_dev->lun);
825 scsi_change_queue_depth(scsi_dev, 1);
826 }
827
828 scsi_dev->allow_restart = 1;
829
830 return 0;
831}
832EXPORT_SYMBOL_GPL(sas_slave_configure);
833
834int sas_change_queue_depth(struct scsi_device *sdev, int depth)
835{
836 struct domain_device *dev = sdev_to_domain_dev(sdev);
837
838 if (dev_is_sata(dev))
839 return ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
840
841 if (!sdev->tagged_supported)
842 depth = 1;
843 return scsi_change_queue_depth(sdev, depth);
844}
845EXPORT_SYMBOL_GPL(sas_change_queue_depth);
846
847int sas_bios_param(struct scsi_device *scsi_dev,
848 struct block_device *bdev,
849 sector_t capacity, int *hsc)
850{
851 hsc[0] = 255;
852 hsc[1] = 63;
853 sector_div(capacity, 255*63);
854 hsc[2] = capacity;
855
856 return 0;
857}
858EXPORT_SYMBOL_GPL(sas_bios_param);
859
860void sas_task_internal_done(struct sas_task *task)
861{
862 del_timer(&task->slow_task->timer);
863 complete(&task->slow_task->completion);
864}
865
866void sas_task_internal_timedout(struct timer_list *t)
867{
868 struct sas_task_slow *slow = from_timer(slow, t, timer);
869 struct sas_task *task = slow->task;
870 bool is_completed = true;
871 unsigned long flags;
872
873 spin_lock_irqsave(&task->task_state_lock, flags);
874 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
875 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
876 is_completed = false;
877 }
878 spin_unlock_irqrestore(&task->task_state_lock, flags);
879
880 if (!is_completed)
881 complete(&task->slow_task->completion);
882}
883
884#define TASK_TIMEOUT (20 * HZ)
885#define TASK_RETRY 3
886
887static int sas_execute_internal_abort(struct domain_device *device,
888 enum sas_internal_abort type, u16 tag,
889 unsigned int qid, void *data)
890{
891 struct sas_ha_struct *ha = device->port->ha;
892 struct sas_internal *i = to_sas_internal(ha->shost->transportt);
893 struct sas_task *task = NULL;
894 int res, retry;
895
896 for (retry = 0; retry < TASK_RETRY; retry++) {
897 task = sas_alloc_slow_task(GFP_KERNEL);
898 if (!task)
899 return -ENOMEM;
900
901 task->dev = device;
902 task->task_proto = SAS_PROTOCOL_INTERNAL_ABORT;
903 task->task_done = sas_task_internal_done;
904 task->slow_task->timer.function = sas_task_internal_timedout;
905 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
906 add_timer(&task->slow_task->timer);
907
908 task->abort_task.tag = tag;
909 task->abort_task.type = type;
910 task->abort_task.qid = qid;
911
912 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
913 if (res) {
914 del_timer_sync(&task->slow_task->timer);
915 pr_err("Executing internal abort failed %016llx (%d)\n",
916 SAS_ADDR(device->sas_addr), res);
917 break;
918 }
919
920 wait_for_completion(&task->slow_task->completion);
921 res = TMF_RESP_FUNC_FAILED;
922
923 /* Even if the internal abort timed out, return direct. */
924 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
925 bool quit = true;
926
927 if (i->dft->lldd_abort_timeout)
928 quit = i->dft->lldd_abort_timeout(task, data);
929 else
930 pr_err("Internal abort: timeout %016llx\n",
931 SAS_ADDR(device->sas_addr));
932 res = -EIO;
933 if (quit)
934 break;
935 }
936
937 if (task->task_status.resp == SAS_TASK_COMPLETE &&
938 task->task_status.stat == SAS_SAM_STAT_GOOD) {
939 res = TMF_RESP_FUNC_COMPLETE;
940 break;
941 }
942
943 if (task->task_status.resp == SAS_TASK_COMPLETE &&
944 task->task_status.stat == TMF_RESP_FUNC_SUCC) {
945 res = TMF_RESP_FUNC_SUCC;
946 break;
947 }
948
949 pr_err("Internal abort: task to dev %016llx response: 0x%x status 0x%x\n",
950 SAS_ADDR(device->sas_addr), task->task_status.resp,
951 task->task_status.stat);
952 sas_free_task(task);
953 task = NULL;
954 }
955 BUG_ON(retry == TASK_RETRY && task != NULL);
956 sas_free_task(task);
957 return res;
958}
959
960int sas_execute_internal_abort_single(struct domain_device *device, u16 tag,
961 unsigned int qid, void *data)
962{
963 return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_SINGLE,
964 tag, qid, data);
965}
966EXPORT_SYMBOL_GPL(sas_execute_internal_abort_single);
967
968int sas_execute_internal_abort_dev(struct domain_device *device,
969 unsigned int qid, void *data)
970{
971 return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_DEV,
972 SCSI_NO_TAG, qid, data);
973}
974EXPORT_SYMBOL_GPL(sas_execute_internal_abort_dev);
975
976int sas_execute_tmf(struct domain_device *device, void *parameter,
977 int para_len, int force_phy_id,
978 struct sas_tmf_task *tmf)
979{
980 struct sas_task *task;
981 struct sas_internal *i =
982 to_sas_internal(device->port->ha->shost->transportt);
983 int res, retry;
984
985 for (retry = 0; retry < TASK_RETRY; retry++) {
986 task = sas_alloc_slow_task(GFP_KERNEL);
987 if (!task)
988 return -ENOMEM;
989
990 task->dev = device;
991 task->task_proto = device->tproto;
992
993 if (dev_is_sata(device)) {
994 task->ata_task.device_control_reg_update = 1;
995 if (force_phy_id >= 0) {
996 task->ata_task.force_phy = true;
997 task->ata_task.force_phy_id = force_phy_id;
998 }
999 memcpy(&task->ata_task.fis, parameter, para_len);
1000 } else {
1001 memcpy(&task->ssp_task, parameter, para_len);
1002 }
1003
1004 task->task_done = sas_task_internal_done;
1005 task->tmf = tmf;
1006
1007 task->slow_task->timer.function = sas_task_internal_timedout;
1008 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
1009 add_timer(&task->slow_task->timer);
1010
1011 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
1012 if (res) {
1013 del_timer_sync(&task->slow_task->timer);
1014 pr_err("executing TMF task failed %016llx (%d)\n",
1015 SAS_ADDR(device->sas_addr), res);
1016 break;
1017 }
1018
1019 wait_for_completion(&task->slow_task->completion);
1020
1021 if (i->dft->lldd_tmf_exec_complete)
1022 i->dft->lldd_tmf_exec_complete(device);
1023
1024 res = TMF_RESP_FUNC_FAILED;
1025
1026 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
1027 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
1028 pr_err("TMF task timeout for %016llx and not done\n",
1029 SAS_ADDR(device->sas_addr));
1030 if (i->dft->lldd_tmf_aborted)
1031 i->dft->lldd_tmf_aborted(task);
1032 break;
1033 }
1034 pr_warn("TMF task timeout for %016llx and done\n",
1035 SAS_ADDR(device->sas_addr));
1036 }
1037
1038 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1039 task->task_status.stat == TMF_RESP_FUNC_COMPLETE) {
1040 res = TMF_RESP_FUNC_COMPLETE;
1041 break;
1042 }
1043
1044 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1045 task->task_status.stat == TMF_RESP_FUNC_SUCC) {
1046 res = TMF_RESP_FUNC_SUCC;
1047 break;
1048 }
1049
1050 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1051 task->task_status.stat == SAS_DATA_UNDERRUN) {
1052 /* no error, but return the number of bytes of
1053 * underrun
1054 */
1055 pr_warn("TMF task to dev %016llx resp: 0x%x sts 0x%x underrun\n",
1056 SAS_ADDR(device->sas_addr),
1057 task->task_status.resp,
1058 task->task_status.stat);
1059 res = task->task_status.residual;
1060 break;
1061 }
1062
1063 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1064 task->task_status.stat == SAS_DATA_OVERRUN) {
1065 pr_warn("TMF task blocked task error %016llx\n",
1066 SAS_ADDR(device->sas_addr));
1067 res = -EMSGSIZE;
1068 break;
1069 }
1070
1071 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1072 task->task_status.stat == SAS_OPEN_REJECT) {
1073 pr_warn("TMF task open reject failed %016llx\n",
1074 SAS_ADDR(device->sas_addr));
1075 res = -EIO;
1076 } else {
1077 pr_warn("TMF task to dev %016llx resp: 0x%x status 0x%x\n",
1078 SAS_ADDR(device->sas_addr),
1079 task->task_status.resp,
1080 task->task_status.stat);
1081 }
1082 sas_free_task(task);
1083 task = NULL;
1084 }
1085
1086 if (retry == TASK_RETRY)
1087 pr_warn("executing TMF for %016llx failed after %d attempts!\n",
1088 SAS_ADDR(device->sas_addr), TASK_RETRY);
1089 sas_free_task(task);
1090
1091 return res;
1092}
1093
1094static int sas_execute_ssp_tmf(struct domain_device *device, u8 *lun,
1095 struct sas_tmf_task *tmf)
1096{
1097 struct sas_ssp_task ssp_task;
1098
1099 if (!(device->tproto & SAS_PROTOCOL_SSP))
1100 return TMF_RESP_FUNC_ESUPP;
1101
1102 memcpy(ssp_task.LUN, lun, 8);
1103
1104 return sas_execute_tmf(device, &ssp_task, sizeof(ssp_task), -1, tmf);
1105}
1106
1107int sas_abort_task_set(struct domain_device *dev, u8 *lun)
1108{
1109 struct sas_tmf_task tmf_task = {
1110 .tmf = TMF_ABORT_TASK_SET,
1111 };
1112
1113 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1114}
1115EXPORT_SYMBOL_GPL(sas_abort_task_set);
1116
1117int sas_clear_task_set(struct domain_device *dev, u8 *lun)
1118{
1119 struct sas_tmf_task tmf_task = {
1120 .tmf = TMF_CLEAR_TASK_SET,
1121 };
1122
1123 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1124}
1125EXPORT_SYMBOL_GPL(sas_clear_task_set);
1126
1127int sas_lu_reset(struct domain_device *dev, u8 *lun)
1128{
1129 struct sas_tmf_task tmf_task = {
1130 .tmf = TMF_LU_RESET,
1131 };
1132
1133 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1134}
1135EXPORT_SYMBOL_GPL(sas_lu_reset);
1136
1137int sas_query_task(struct sas_task *task, u16 tag)
1138{
1139 struct sas_tmf_task tmf_task = {
1140 .tmf = TMF_QUERY_TASK,
1141 .tag_of_task_to_be_managed = tag,
1142 };
1143 struct scsi_cmnd *cmnd = task->uldd_task;
1144 struct domain_device *dev = task->dev;
1145 struct scsi_lun lun;
1146
1147 int_to_scsilun(cmnd->device->lun, &lun);
1148
1149 return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1150}
1151EXPORT_SYMBOL_GPL(sas_query_task);
1152
1153int sas_abort_task(struct sas_task *task, u16 tag)
1154{
1155 struct sas_tmf_task tmf_task = {
1156 .tmf = TMF_ABORT_TASK,
1157 .tag_of_task_to_be_managed = tag,
1158 };
1159 struct scsi_cmnd *cmnd = task->uldd_task;
1160 struct domain_device *dev = task->dev;
1161 struct scsi_lun lun;
1162
1163 int_to_scsilun(cmnd->device->lun, &lun);
1164
1165 return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1166}
1167EXPORT_SYMBOL_GPL(sas_abort_task);
1168
1169/*
1170 * Tell an upper layer that it needs to initiate an abort for a given task.
1171 * This should only ever be called by an LLDD.
1172 */
1173void sas_task_abort(struct sas_task *task)
1174{
1175 struct scsi_cmnd *sc = task->uldd_task;
1176
1177 /* Escape for libsas internal commands */
1178 if (!sc) {
1179 struct sas_task_slow *slow = task->slow_task;
1180
1181 if (!slow)
1182 return;
1183 if (!del_timer(&slow->timer))
1184 return;
1185 slow->timer.function(&slow->timer);
1186 return;
1187 }
1188
1189 if (dev_is_sata(task->dev))
1190 sas_ata_task_abort(task);
1191 else
1192 blk_abort_request(scsi_cmd_to_rq(sc));
1193}
1194EXPORT_SYMBOL_GPL(sas_task_abort);
1195
1196int sas_slave_alloc(struct scsi_device *sdev)
1197{
1198 if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
1199 return -ENXIO;
1200
1201 return 0;
1202}
1203EXPORT_SYMBOL_GPL(sas_slave_alloc);
1204
1205void sas_target_destroy(struct scsi_target *starget)
1206{
1207 struct domain_device *found_dev = starget->hostdata;
1208
1209 if (!found_dev)
1210 return;
1211
1212 starget->hostdata = NULL;
1213 sas_put_device(found_dev);
1214}
1215EXPORT_SYMBOL_GPL(sas_target_destroy);
1216
1217#define SAS_STRING_ADDR_SIZE 16
1218
1219int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1220{
1221 int res;
1222 const struct firmware *fw;
1223
1224 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1225 if (res)
1226 return res;
1227
1228 if (fw->size < SAS_STRING_ADDR_SIZE) {
1229 res = -ENODEV;
1230 goto out;
1231 }
1232
1233 res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
1234 if (res)
1235 goto out;
1236
1237out:
1238 release_firmware(fw);
1239 return res;
1240}
1241EXPORT_SYMBOL_GPL(sas_request_addr);
1242
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Serial Attached SCSI (SAS) class SCSI Host glue.
4 *
5 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
7 */
8
9#include <linux/kthread.h>
10#include <linux/firmware.h>
11#include <linux/export.h>
12#include <linux/ctype.h>
13#include <linux/kernel.h>
14
15#include "sas_internal.h"
16
17#include <scsi/scsi_host.h>
18#include <scsi/scsi_device.h>
19#include <scsi/scsi_tcq.h>
20#include <scsi/scsi.h>
21#include <scsi/scsi_eh.h>
22#include <scsi/scsi_transport.h>
23#include <scsi/scsi_transport_sas.h>
24#include <scsi/sas_ata.h>
25#include "scsi_sas_internal.h"
26#include "scsi_transport_api.h"
27#include "scsi_priv.h"
28
29#include <linux/err.h>
30#include <linux/blkdev.h>
31#include <linux/freezer.h>
32#include <linux/gfp.h>
33#include <linux/scatterlist.h>
34#include <linux/libata.h>
35
36/* record final status and free the task */
37static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
38{
39 struct task_status_struct *ts = &task->task_status;
40 enum scsi_host_status hs = DID_OK;
41 enum exec_status stat = SAS_SAM_STAT_GOOD;
42
43 if (ts->resp == SAS_TASK_UNDELIVERED) {
44 /* transport error */
45 hs = DID_NO_CONNECT;
46 } else { /* ts->resp == SAS_TASK_COMPLETE */
47 /* task delivered, what happened afterwards? */
48 switch (ts->stat) {
49 case SAS_DEV_NO_RESPONSE:
50 case SAS_INTERRUPTED:
51 case SAS_PHY_DOWN:
52 case SAS_NAK_R_ERR:
53 case SAS_OPEN_TO:
54 hs = DID_NO_CONNECT;
55 break;
56 case SAS_DATA_UNDERRUN:
57 scsi_set_resid(sc, ts->residual);
58 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
59 hs = DID_ERROR;
60 break;
61 case SAS_DATA_OVERRUN:
62 hs = DID_ERROR;
63 break;
64 case SAS_QUEUE_FULL:
65 hs = DID_SOFT_ERROR; /* retry */
66 break;
67 case SAS_DEVICE_UNKNOWN:
68 hs = DID_BAD_TARGET;
69 break;
70 case SAS_OPEN_REJECT:
71 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
72 hs = DID_SOFT_ERROR; /* retry */
73 else
74 hs = DID_ERROR;
75 break;
76 case SAS_PROTO_RESPONSE:
77 pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP task; please report this\n",
78 task->dev->port->ha->sas_ha_name);
79 break;
80 case SAS_ABORTED_TASK:
81 hs = DID_ABORT;
82 break;
83 case SAS_SAM_STAT_CHECK_CONDITION:
84 memcpy(sc->sense_buffer, ts->buf,
85 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
86 stat = SAS_SAM_STAT_CHECK_CONDITION;
87 break;
88 default:
89 stat = ts->stat;
90 break;
91 }
92 }
93
94 sc->result = (hs << 16) | stat;
95 ASSIGN_SAS_TASK(sc, NULL);
96 sas_free_task(task);
97}
98
99static void sas_scsi_task_done(struct sas_task *task)
100{
101 struct scsi_cmnd *sc = task->uldd_task;
102 struct domain_device *dev = task->dev;
103 struct sas_ha_struct *ha = dev->port->ha;
104 unsigned long flags;
105
106 spin_lock_irqsave(&dev->done_lock, flags);
107 if (test_bit(SAS_HA_FROZEN, &ha->state))
108 task = NULL;
109 else
110 ASSIGN_SAS_TASK(sc, NULL);
111 spin_unlock_irqrestore(&dev->done_lock, flags);
112
113 if (unlikely(!task)) {
114 /* task will be completed by the error handler */
115 pr_debug("task done but aborted\n");
116 return;
117 }
118
119 if (unlikely(!sc)) {
120 pr_debug("task_done called with non existing SCSI cmnd!\n");
121 sas_free_task(task);
122 return;
123 }
124
125 sas_end_task(sc, task);
126 scsi_done(sc);
127}
128
129static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
130 struct domain_device *dev,
131 gfp_t gfp_flags)
132{
133 struct sas_task *task = sas_alloc_task(gfp_flags);
134 struct scsi_lun lun;
135
136 if (!task)
137 return NULL;
138
139 task->uldd_task = cmd;
140 ASSIGN_SAS_TASK(cmd, task);
141
142 task->dev = dev;
143 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
144
145 task->ssp_task.retry_count = 1;
146 int_to_scsilun(cmd->device->lun, &lun);
147 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
148 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
149 task->ssp_task.cmd = cmd;
150
151 task->scatter = scsi_sglist(cmd);
152 task->num_scatter = scsi_sg_count(cmd);
153 task->total_xfer_len = scsi_bufflen(cmd);
154 task->data_dir = cmd->sc_data_direction;
155
156 task->task_done = sas_scsi_task_done;
157
158 return task;
159}
160
161int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
162{
163 struct sas_internal *i = to_sas_internal(host->transportt);
164 struct domain_device *dev = cmd_to_domain_dev(cmd);
165 struct sas_task *task;
166 int res = 0;
167
168 /* If the device fell off, no sense in issuing commands */
169 if (test_bit(SAS_DEV_GONE, &dev->state)) {
170 cmd->result = DID_BAD_TARGET << 16;
171 goto out_done;
172 }
173
174 if (dev_is_sata(dev)) {
175 spin_lock_irq(dev->sata_dev.ap->lock);
176 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
177 spin_unlock_irq(dev->sata_dev.ap->lock);
178 return res;
179 }
180
181 task = sas_create_task(cmd, dev, GFP_ATOMIC);
182 if (!task)
183 return SCSI_MLQUEUE_HOST_BUSY;
184
185 res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
186 if (res)
187 goto out_free_task;
188 return 0;
189
190out_free_task:
191 pr_debug("lldd_execute_task returned: %d\n", res);
192 ASSIGN_SAS_TASK(cmd, NULL);
193 sas_free_task(task);
194 if (res == -SAS_QUEUE_FULL)
195 cmd->result = DID_SOFT_ERROR << 16; /* retry */
196 else
197 cmd->result = DID_ERROR << 16;
198out_done:
199 scsi_done(cmd);
200 return 0;
201}
202EXPORT_SYMBOL_GPL(sas_queuecommand);
203
204static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
205{
206 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
207 struct domain_device *dev = cmd_to_domain_dev(cmd);
208 struct sas_task *task = TO_SAS_TASK(cmd);
209
210 /* At this point, we only get called following an actual abort
211 * of the task, so we should be guaranteed not to be racing with
212 * any completions from the LLD. Task is freed after this.
213 */
214 sas_end_task(cmd, task);
215
216 if (dev_is_sata(dev)) {
217 /* defer commands to libata so that libata EH can
218 * handle ata qcs correctly
219 */
220 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
221 return;
222 }
223
224 /* now finish the command and move it on to the error
225 * handler done list, this also takes it off the
226 * error handler pending list.
227 */
228 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
229}
230
231static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
232{
233 struct scsi_cmnd *cmd, *n;
234
235 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
236 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
237 cmd->device->lun == my_cmd->device->lun)
238 sas_eh_finish_cmd(cmd);
239 }
240}
241
242static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
243 struct domain_device *dev)
244{
245 struct scsi_cmnd *cmd, *n;
246
247 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
248 struct domain_device *x = cmd_to_domain_dev(cmd);
249
250 if (x == dev)
251 sas_eh_finish_cmd(cmd);
252 }
253}
254
255static void sas_scsi_clear_queue_port(struct list_head *error_q,
256 struct asd_sas_port *port)
257{
258 struct scsi_cmnd *cmd, *n;
259
260 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
261 struct domain_device *dev = cmd_to_domain_dev(cmd);
262 struct asd_sas_port *x = dev->port;
263
264 if (x == port)
265 sas_eh_finish_cmd(cmd);
266 }
267}
268
269enum task_disposition {
270 TASK_IS_DONE,
271 TASK_IS_ABORTED,
272 TASK_IS_AT_LU,
273 TASK_IS_NOT_AT_LU,
274 TASK_ABORT_FAILED,
275};
276
277static enum task_disposition sas_scsi_find_task(struct sas_task *task)
278{
279 unsigned long flags;
280 int i, res;
281 struct sas_internal *si =
282 to_sas_internal(task->dev->port->ha->core.shost->transportt);
283
284 for (i = 0; i < 5; i++) {
285 pr_notice("%s: aborting task 0x%p\n", __func__, task);
286 res = si->dft->lldd_abort_task(task);
287
288 spin_lock_irqsave(&task->task_state_lock, flags);
289 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
290 spin_unlock_irqrestore(&task->task_state_lock, flags);
291 pr_debug("%s: task 0x%p is done\n", __func__, task);
292 return TASK_IS_DONE;
293 }
294 spin_unlock_irqrestore(&task->task_state_lock, flags);
295
296 if (res == TMF_RESP_FUNC_COMPLETE) {
297 pr_notice("%s: task 0x%p is aborted\n",
298 __func__, task);
299 return TASK_IS_ABORTED;
300 } else if (si->dft->lldd_query_task) {
301 pr_notice("%s: querying task 0x%p\n", __func__, task);
302 res = si->dft->lldd_query_task(task);
303 switch (res) {
304 case TMF_RESP_FUNC_SUCC:
305 pr_notice("%s: task 0x%p at LU\n", __func__,
306 task);
307 return TASK_IS_AT_LU;
308 case TMF_RESP_FUNC_COMPLETE:
309 pr_notice("%s: task 0x%p not at LU\n",
310 __func__, task);
311 return TASK_IS_NOT_AT_LU;
312 case TMF_RESP_FUNC_FAILED:
313 pr_notice("%s: task 0x%p failed to abort\n",
314 __func__, task);
315 return TASK_ABORT_FAILED;
316 default:
317 pr_notice("%s: task 0x%p result code %d not handled\n",
318 __func__, task, res);
319 }
320 }
321 }
322 return TASK_ABORT_FAILED;
323}
324
325static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
326{
327 int res = TMF_RESP_FUNC_FAILED;
328 struct scsi_lun lun;
329 struct sas_internal *i =
330 to_sas_internal(dev->port->ha->core.shost->transportt);
331
332 int_to_scsilun(cmd->device->lun, &lun);
333
334 pr_notice("eh: device %016llx LUN 0x%llx has the task\n",
335 SAS_ADDR(dev->sas_addr),
336 cmd->device->lun);
337
338 if (i->dft->lldd_abort_task_set)
339 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
340
341 if (res == TMF_RESP_FUNC_FAILED) {
342 if (i->dft->lldd_clear_task_set)
343 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
344 }
345
346 if (res == TMF_RESP_FUNC_FAILED) {
347 if (i->dft->lldd_lu_reset)
348 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
349 }
350
351 return res;
352}
353
354static int sas_recover_I_T(struct domain_device *dev)
355{
356 int res = TMF_RESP_FUNC_FAILED;
357 struct sas_internal *i =
358 to_sas_internal(dev->port->ha->core.shost->transportt);
359
360 pr_notice("I_T nexus reset for dev %016llx\n",
361 SAS_ADDR(dev->sas_addr));
362
363 if (i->dft->lldd_I_T_nexus_reset)
364 res = i->dft->lldd_I_T_nexus_reset(dev);
365
366 return res;
367}
368
369/* take a reference on the last known good phy for this device */
370struct sas_phy *sas_get_local_phy(struct domain_device *dev)
371{
372 struct sas_ha_struct *ha = dev->port->ha;
373 struct sas_phy *phy;
374 unsigned long flags;
375
376 /* a published domain device always has a valid phy, it may be
377 * stale, but it is never NULL
378 */
379 BUG_ON(!dev->phy);
380
381 spin_lock_irqsave(&ha->phy_port_lock, flags);
382 phy = dev->phy;
383 get_device(&phy->dev);
384 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
385
386 return phy;
387}
388EXPORT_SYMBOL_GPL(sas_get_local_phy);
389
390static void sas_wait_eh(struct domain_device *dev)
391{
392 struct sas_ha_struct *ha = dev->port->ha;
393 DEFINE_WAIT(wait);
394
395 if (dev_is_sata(dev)) {
396 ata_port_wait_eh(dev->sata_dev.ap);
397 return;
398 }
399 retry:
400 spin_lock_irq(&ha->lock);
401
402 while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
403 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
404 spin_unlock_irq(&ha->lock);
405 schedule();
406 spin_lock_irq(&ha->lock);
407 }
408 finish_wait(&ha->eh_wait_q, &wait);
409
410 spin_unlock_irq(&ha->lock);
411
412 /* make sure SCSI EH is complete */
413 if (scsi_host_in_recovery(ha->core.shost)) {
414 msleep(10);
415 goto retry;
416 }
417}
418
419static int sas_queue_reset(struct domain_device *dev, int reset_type,
420 u64 lun, int wait)
421{
422 struct sas_ha_struct *ha = dev->port->ha;
423 int scheduled = 0, tries = 100;
424
425 /* ata: promote lun reset to bus reset */
426 if (dev_is_sata(dev)) {
427 sas_ata_schedule_reset(dev);
428 if (wait)
429 sas_ata_wait_eh(dev);
430 return SUCCESS;
431 }
432
433 while (!scheduled && tries--) {
434 spin_lock_irq(&ha->lock);
435 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
436 !test_bit(reset_type, &dev->state)) {
437 scheduled = 1;
438 ha->eh_active++;
439 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
440 set_bit(SAS_DEV_EH_PENDING, &dev->state);
441 set_bit(reset_type, &dev->state);
442 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
443 scsi_schedule_eh(ha->core.shost);
444 }
445 spin_unlock_irq(&ha->lock);
446
447 if (wait)
448 sas_wait_eh(dev);
449
450 if (scheduled)
451 return SUCCESS;
452 }
453
454 pr_warn("%s reset of %s failed\n",
455 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
456 dev_name(&dev->rphy->dev));
457
458 return FAILED;
459}
460
461int sas_eh_abort_handler(struct scsi_cmnd *cmd)
462{
463 int res = TMF_RESP_FUNC_FAILED;
464 struct sas_task *task = TO_SAS_TASK(cmd);
465 struct Scsi_Host *host = cmd->device->host;
466 struct domain_device *dev = cmd_to_domain_dev(cmd);
467 struct sas_internal *i = to_sas_internal(host->transportt);
468 unsigned long flags;
469
470 if (!i->dft->lldd_abort_task)
471 return FAILED;
472
473 spin_lock_irqsave(host->host_lock, flags);
474 /* We cannot do async aborts for SATA devices */
475 if (dev_is_sata(dev) && !host->host_eh_scheduled) {
476 spin_unlock_irqrestore(host->host_lock, flags);
477 return FAILED;
478 }
479 spin_unlock_irqrestore(host->host_lock, flags);
480
481 if (task)
482 res = i->dft->lldd_abort_task(task);
483 else
484 pr_notice("no task to abort\n");
485 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
486 return SUCCESS;
487
488 return FAILED;
489}
490EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
491
492/* Attempt to send a LUN reset message to a device */
493int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
494{
495 int res;
496 struct scsi_lun lun;
497 struct Scsi_Host *host = cmd->device->host;
498 struct domain_device *dev = cmd_to_domain_dev(cmd);
499 struct sas_internal *i = to_sas_internal(host->transportt);
500
501 if (current != host->ehandler)
502 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
503
504 int_to_scsilun(cmd->device->lun, &lun);
505
506 if (!i->dft->lldd_lu_reset)
507 return FAILED;
508
509 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
510 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
511 return SUCCESS;
512
513 return FAILED;
514}
515EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
516
517int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
518{
519 int res;
520 struct Scsi_Host *host = cmd->device->host;
521 struct domain_device *dev = cmd_to_domain_dev(cmd);
522 struct sas_internal *i = to_sas_internal(host->transportt);
523
524 if (current != host->ehandler)
525 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
526
527 if (!i->dft->lldd_I_T_nexus_reset)
528 return FAILED;
529
530 res = i->dft->lldd_I_T_nexus_reset(dev);
531 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
532 res == -ENODEV)
533 return SUCCESS;
534
535 return FAILED;
536}
537EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
538
539/* Try to reset a device */
540static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
541{
542 int res;
543 struct Scsi_Host *shost = cmd->device->host;
544
545 if (!shost->hostt->eh_device_reset_handler)
546 goto try_target_reset;
547
548 res = shost->hostt->eh_device_reset_handler(cmd);
549 if (res == SUCCESS)
550 return res;
551
552try_target_reset:
553 if (shost->hostt->eh_target_reset_handler)
554 return shost->hostt->eh_target_reset_handler(cmd);
555
556 return FAILED;
557}
558
559static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
560{
561 struct scsi_cmnd *cmd, *n;
562 enum task_disposition res = TASK_IS_DONE;
563 int tmf_resp, need_reset;
564 struct sas_internal *i = to_sas_internal(shost->transportt);
565 unsigned long flags;
566 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
567 LIST_HEAD(done);
568
569 /* clean out any commands that won the completion vs eh race */
570 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
571 struct domain_device *dev = cmd_to_domain_dev(cmd);
572 struct sas_task *task;
573
574 spin_lock_irqsave(&dev->done_lock, flags);
575 /* by this point the lldd has either observed
576 * SAS_HA_FROZEN and is leaving the task alone, or has
577 * won the race with eh and decided to complete it
578 */
579 task = TO_SAS_TASK(cmd);
580 spin_unlock_irqrestore(&dev->done_lock, flags);
581
582 if (!task)
583 list_move_tail(&cmd->eh_entry, &done);
584 }
585
586 Again:
587 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
588 struct sas_task *task = TO_SAS_TASK(cmd);
589
590 list_del_init(&cmd->eh_entry);
591
592 spin_lock_irqsave(&task->task_state_lock, flags);
593 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
594 spin_unlock_irqrestore(&task->task_state_lock, flags);
595
596 if (need_reset) {
597 pr_notice("%s: task 0x%p requests reset\n",
598 __func__, task);
599 goto reset;
600 }
601
602 pr_debug("trying to find task 0x%p\n", task);
603 res = sas_scsi_find_task(task);
604
605 switch (res) {
606 case TASK_IS_DONE:
607 pr_notice("%s: task 0x%p is done\n", __func__,
608 task);
609 sas_eh_finish_cmd(cmd);
610 continue;
611 case TASK_IS_ABORTED:
612 pr_notice("%s: task 0x%p is aborted\n",
613 __func__, task);
614 sas_eh_finish_cmd(cmd);
615 continue;
616 case TASK_IS_AT_LU:
617 pr_info("task 0x%p is at LU: lu recover\n", task);
618 reset:
619 tmf_resp = sas_recover_lu(task->dev, cmd);
620 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
621 pr_notice("dev %016llx LU 0x%llx is recovered\n",
622 SAS_ADDR(task->dev),
623 cmd->device->lun);
624 sas_eh_finish_cmd(cmd);
625 sas_scsi_clear_queue_lu(work_q, cmd);
626 goto Again;
627 }
628 fallthrough;
629 case TASK_IS_NOT_AT_LU:
630 case TASK_ABORT_FAILED:
631 pr_notice("task 0x%p is not at LU: I_T recover\n",
632 task);
633 tmf_resp = sas_recover_I_T(task->dev);
634 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
635 tmf_resp == -ENODEV) {
636 struct domain_device *dev = task->dev;
637 pr_notice("I_T %016llx recovered\n",
638 SAS_ADDR(task->dev->sas_addr));
639 sas_eh_finish_cmd(cmd);
640 sas_scsi_clear_queue_I_T(work_q, dev);
641 goto Again;
642 }
643 /* Hammer time :-) */
644 try_to_reset_cmd_device(cmd);
645 if (i->dft->lldd_clear_nexus_port) {
646 struct asd_sas_port *port = task->dev->port;
647 pr_debug("clearing nexus for port:%d\n",
648 port->id);
649 res = i->dft->lldd_clear_nexus_port(port);
650 if (res == TMF_RESP_FUNC_COMPLETE) {
651 pr_notice("clear nexus port:%d succeeded\n",
652 port->id);
653 sas_eh_finish_cmd(cmd);
654 sas_scsi_clear_queue_port(work_q,
655 port);
656 goto Again;
657 }
658 }
659 if (i->dft->lldd_clear_nexus_ha) {
660 pr_debug("clear nexus ha\n");
661 res = i->dft->lldd_clear_nexus_ha(ha);
662 if (res == TMF_RESP_FUNC_COMPLETE) {
663 pr_notice("clear nexus ha succeeded\n");
664 sas_eh_finish_cmd(cmd);
665 goto clear_q;
666 }
667 }
668 /* If we are here -- this means that no amount
669 * of effort could recover from errors. Quite
670 * possibly the HA just disappeared.
671 */
672 pr_err("error from device %016llx, LUN 0x%llx couldn't be recovered in any way\n",
673 SAS_ADDR(task->dev->sas_addr),
674 cmd->device->lun);
675
676 sas_eh_finish_cmd(cmd);
677 goto clear_q;
678 }
679 }
680 out:
681 list_splice_tail(&done, work_q);
682 list_splice_tail_init(&ha->eh_ata_q, work_q);
683 return;
684
685 clear_q:
686 pr_debug("--- Exit %s -- clear_q\n", __func__);
687 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
688 sas_eh_finish_cmd(cmd);
689 goto out;
690}
691
692static void sas_eh_handle_resets(struct Scsi_Host *shost)
693{
694 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
695 struct sas_internal *i = to_sas_internal(shost->transportt);
696
697 /* handle directed resets to sas devices */
698 spin_lock_irq(&ha->lock);
699 while (!list_empty(&ha->eh_dev_q)) {
700 struct domain_device *dev;
701 struct ssp_device *ssp;
702
703 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
704 list_del_init(&ssp->eh_list_node);
705 dev = container_of(ssp, typeof(*dev), ssp_dev);
706 kref_get(&dev->kref);
707 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
708
709 spin_unlock_irq(&ha->lock);
710
711 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
712 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
713
714 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
715 i->dft->lldd_I_T_nexus_reset(dev);
716
717 sas_put_device(dev);
718 spin_lock_irq(&ha->lock);
719 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
720 ha->eh_active--;
721 }
722 spin_unlock_irq(&ha->lock);
723}
724
725
726void sas_scsi_recover_host(struct Scsi_Host *shost)
727{
728 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
729 LIST_HEAD(eh_work_q);
730 int tries = 0;
731 bool retry;
732
733retry:
734 tries++;
735 retry = true;
736 spin_lock_irq(shost->host_lock);
737 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
738 spin_unlock_irq(shost->host_lock);
739
740 pr_notice("Enter %s busy: %d failed: %d\n",
741 __func__, scsi_host_busy(shost), shost->host_failed);
742 /*
743 * Deal with commands that still have SAS tasks (i.e. they didn't
744 * complete via the normal sas_task completion mechanism),
745 * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
746 */
747 set_bit(SAS_HA_FROZEN, &ha->state);
748 sas_eh_handle_sas_errors(shost, &eh_work_q);
749 clear_bit(SAS_HA_FROZEN, &ha->state);
750 if (list_empty(&eh_work_q))
751 goto out;
752
753 /*
754 * Now deal with SCSI commands that completed ok but have a an error
755 * code (and hopefully sense data) attached. This is roughly what
756 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
757 * command we see here has no sas_task and is thus unknown to the HA.
758 */
759 sas_ata_eh(shost, &eh_work_q);
760 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
761 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
762
763out:
764 sas_eh_handle_resets(shost);
765
766 /* now link into libata eh --- if we have any ata devices */
767 sas_ata_strategy_handler(shost);
768
769 scsi_eh_flush_done_q(&ha->eh_done_q);
770
771 /* check if any new eh work was scheduled during the last run */
772 spin_lock_irq(&ha->lock);
773 if (ha->eh_active == 0) {
774 shost->host_eh_scheduled = 0;
775 retry = false;
776 }
777 spin_unlock_irq(&ha->lock);
778
779 if (retry)
780 goto retry;
781
782 pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n",
783 __func__, scsi_host_busy(shost),
784 shost->host_failed, tries);
785}
786
787int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
788{
789 struct domain_device *dev = sdev_to_domain_dev(sdev);
790
791 if (dev_is_sata(dev))
792 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
793
794 return -EINVAL;
795}
796EXPORT_SYMBOL_GPL(sas_ioctl);
797
798struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
799{
800 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
801 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
802 struct domain_device *found_dev = NULL;
803 int i;
804 unsigned long flags;
805
806 spin_lock_irqsave(&ha->phy_port_lock, flags);
807 for (i = 0; i < ha->num_phys; i++) {
808 struct asd_sas_port *port = ha->sas_port[i];
809 struct domain_device *dev;
810
811 spin_lock(&port->dev_list_lock);
812 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
813 if (rphy == dev->rphy) {
814 found_dev = dev;
815 spin_unlock(&port->dev_list_lock);
816 goto found;
817 }
818 }
819 spin_unlock(&port->dev_list_lock);
820 }
821 found:
822 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
823
824 return found_dev;
825}
826
827int sas_target_alloc(struct scsi_target *starget)
828{
829 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
830 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
831
832 if (!found_dev)
833 return -ENODEV;
834
835 kref_get(&found_dev->kref);
836 starget->hostdata = found_dev;
837 return 0;
838}
839EXPORT_SYMBOL_GPL(sas_target_alloc);
840
841#define SAS_DEF_QD 256
842
843int sas_slave_configure(struct scsi_device *scsi_dev)
844{
845 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
846
847 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
848
849 if (dev_is_sata(dev)) {
850 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
851 return 0;
852 }
853
854 sas_read_port_mode_page(scsi_dev);
855
856 if (scsi_dev->tagged_supported) {
857 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
858 } else {
859 pr_notice("device %016llx, LUN 0x%llx doesn't support TCQ\n",
860 SAS_ADDR(dev->sas_addr), scsi_dev->lun);
861 scsi_change_queue_depth(scsi_dev, 1);
862 }
863
864 scsi_dev->allow_restart = 1;
865
866 return 0;
867}
868EXPORT_SYMBOL_GPL(sas_slave_configure);
869
870int sas_change_queue_depth(struct scsi_device *sdev, int depth)
871{
872 struct domain_device *dev = sdev_to_domain_dev(sdev);
873
874 if (dev_is_sata(dev))
875 return ata_change_queue_depth(dev->sata_dev.ap,
876 sas_to_ata_dev(dev), sdev, depth);
877
878 if (!sdev->tagged_supported)
879 depth = 1;
880 return scsi_change_queue_depth(sdev, depth);
881}
882EXPORT_SYMBOL_GPL(sas_change_queue_depth);
883
884int sas_bios_param(struct scsi_device *scsi_dev,
885 struct block_device *bdev,
886 sector_t capacity, int *hsc)
887{
888 hsc[0] = 255;
889 hsc[1] = 63;
890 sector_div(capacity, 255*63);
891 hsc[2] = capacity;
892
893 return 0;
894}
895EXPORT_SYMBOL_GPL(sas_bios_param);
896
897void sas_task_internal_done(struct sas_task *task)
898{
899 del_timer(&task->slow_task->timer);
900 complete(&task->slow_task->completion);
901}
902
903void sas_task_internal_timedout(struct timer_list *t)
904{
905 struct sas_task_slow *slow = from_timer(slow, t, timer);
906 struct sas_task *task = slow->task;
907 bool is_completed = true;
908 unsigned long flags;
909
910 spin_lock_irqsave(&task->task_state_lock, flags);
911 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
912 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
913 is_completed = false;
914 }
915 spin_unlock_irqrestore(&task->task_state_lock, flags);
916
917 if (!is_completed)
918 complete(&task->slow_task->completion);
919}
920
921#define TASK_TIMEOUT (20 * HZ)
922#define TASK_RETRY 3
923
924static int sas_execute_internal_abort(struct domain_device *device,
925 enum sas_internal_abort type, u16 tag,
926 unsigned int qid, void *data)
927{
928 struct sas_ha_struct *ha = device->port->ha;
929 struct sas_internal *i = to_sas_internal(ha->core.shost->transportt);
930 struct sas_task *task = NULL;
931 int res, retry;
932
933 for (retry = 0; retry < TASK_RETRY; retry++) {
934 task = sas_alloc_slow_task(GFP_KERNEL);
935 if (!task)
936 return -ENOMEM;
937
938 task->dev = device;
939 task->task_proto = SAS_PROTOCOL_INTERNAL_ABORT;
940 task->task_done = sas_task_internal_done;
941 task->slow_task->timer.function = sas_task_internal_timedout;
942 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
943 add_timer(&task->slow_task->timer);
944
945 task->abort_task.tag = tag;
946 task->abort_task.type = type;
947 task->abort_task.qid = qid;
948
949 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
950 if (res) {
951 del_timer_sync(&task->slow_task->timer);
952 pr_err("Executing internal abort failed %016llx (%d)\n",
953 SAS_ADDR(device->sas_addr), res);
954 break;
955 }
956
957 wait_for_completion(&task->slow_task->completion);
958 res = TMF_RESP_FUNC_FAILED;
959
960 /* Even if the internal abort timed out, return direct. */
961 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
962 bool quit = true;
963
964 if (i->dft->lldd_abort_timeout)
965 quit = i->dft->lldd_abort_timeout(task, data);
966 else
967 pr_err("Internal abort: timeout %016llx\n",
968 SAS_ADDR(device->sas_addr));
969 res = -EIO;
970 if (quit)
971 break;
972 }
973
974 if (task->task_status.resp == SAS_TASK_COMPLETE &&
975 task->task_status.stat == SAS_SAM_STAT_GOOD) {
976 res = TMF_RESP_FUNC_COMPLETE;
977 break;
978 }
979
980 if (task->task_status.resp == SAS_TASK_COMPLETE &&
981 task->task_status.stat == TMF_RESP_FUNC_SUCC) {
982 res = TMF_RESP_FUNC_SUCC;
983 break;
984 }
985
986 pr_err("Internal abort: task to dev %016llx response: 0x%x status 0x%x\n",
987 SAS_ADDR(device->sas_addr), task->task_status.resp,
988 task->task_status.stat);
989 sas_free_task(task);
990 task = NULL;
991 }
992 BUG_ON(retry == TASK_RETRY && task != NULL);
993 sas_free_task(task);
994 return res;
995}
996
997int sas_execute_internal_abort_single(struct domain_device *device, u16 tag,
998 unsigned int qid, void *data)
999{
1000 return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_SINGLE,
1001 tag, qid, data);
1002}
1003EXPORT_SYMBOL_GPL(sas_execute_internal_abort_single);
1004
1005int sas_execute_internal_abort_dev(struct domain_device *device,
1006 unsigned int qid, void *data)
1007{
1008 return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_DEV,
1009 SCSI_NO_TAG, qid, data);
1010}
1011EXPORT_SYMBOL_GPL(sas_execute_internal_abort_dev);
1012
1013int sas_execute_tmf(struct domain_device *device, void *parameter,
1014 int para_len, int force_phy_id,
1015 struct sas_tmf_task *tmf)
1016{
1017 struct sas_task *task;
1018 struct sas_internal *i =
1019 to_sas_internal(device->port->ha->core.shost->transportt);
1020 int res, retry;
1021
1022 for (retry = 0; retry < TASK_RETRY; retry++) {
1023 task = sas_alloc_slow_task(GFP_KERNEL);
1024 if (!task)
1025 return -ENOMEM;
1026
1027 task->dev = device;
1028 task->task_proto = device->tproto;
1029
1030 if (dev_is_sata(device)) {
1031 task->ata_task.device_control_reg_update = 1;
1032 if (force_phy_id >= 0) {
1033 task->ata_task.force_phy = true;
1034 task->ata_task.force_phy_id = force_phy_id;
1035 }
1036 memcpy(&task->ata_task.fis, parameter, para_len);
1037 } else {
1038 memcpy(&task->ssp_task, parameter, para_len);
1039 }
1040
1041 task->task_done = sas_task_internal_done;
1042 task->tmf = tmf;
1043
1044 task->slow_task->timer.function = sas_task_internal_timedout;
1045 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
1046 add_timer(&task->slow_task->timer);
1047
1048 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
1049 if (res) {
1050 del_timer_sync(&task->slow_task->timer);
1051 pr_err("executing TMF task failed %016llx (%d)\n",
1052 SAS_ADDR(device->sas_addr), res);
1053 break;
1054 }
1055
1056 wait_for_completion(&task->slow_task->completion);
1057
1058 if (i->dft->lldd_tmf_exec_complete)
1059 i->dft->lldd_tmf_exec_complete(device);
1060
1061 res = TMF_RESP_FUNC_FAILED;
1062
1063 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
1064 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
1065 pr_err("TMF task timeout for %016llx and not done\n",
1066 SAS_ADDR(device->sas_addr));
1067 if (i->dft->lldd_tmf_aborted)
1068 i->dft->lldd_tmf_aborted(task);
1069 break;
1070 }
1071 pr_warn("TMF task timeout for %016llx and done\n",
1072 SAS_ADDR(device->sas_addr));
1073 }
1074
1075 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1076 task->task_status.stat == TMF_RESP_FUNC_COMPLETE) {
1077 res = TMF_RESP_FUNC_COMPLETE;
1078 break;
1079 }
1080
1081 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1082 task->task_status.stat == TMF_RESP_FUNC_SUCC) {
1083 res = TMF_RESP_FUNC_SUCC;
1084 break;
1085 }
1086
1087 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1088 task->task_status.stat == SAS_DATA_UNDERRUN) {
1089 /* no error, but return the number of bytes of
1090 * underrun
1091 */
1092 pr_warn("TMF task to dev %016llx resp: 0x%x sts 0x%x underrun\n",
1093 SAS_ADDR(device->sas_addr),
1094 task->task_status.resp,
1095 task->task_status.stat);
1096 res = task->task_status.residual;
1097 break;
1098 }
1099
1100 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1101 task->task_status.stat == SAS_DATA_OVERRUN) {
1102 pr_warn("TMF task blocked task error %016llx\n",
1103 SAS_ADDR(device->sas_addr));
1104 res = -EMSGSIZE;
1105 break;
1106 }
1107
1108 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1109 task->task_status.stat == SAS_OPEN_REJECT) {
1110 pr_warn("TMF task open reject failed %016llx\n",
1111 SAS_ADDR(device->sas_addr));
1112 res = -EIO;
1113 } else {
1114 pr_warn("TMF task to dev %016llx resp: 0x%x status 0x%x\n",
1115 SAS_ADDR(device->sas_addr),
1116 task->task_status.resp,
1117 task->task_status.stat);
1118 }
1119 sas_free_task(task);
1120 task = NULL;
1121 }
1122
1123 if (retry == TASK_RETRY)
1124 pr_warn("executing TMF for %016llx failed after %d attempts!\n",
1125 SAS_ADDR(device->sas_addr), TASK_RETRY);
1126 sas_free_task(task);
1127
1128 return res;
1129}
1130
1131static int sas_execute_ssp_tmf(struct domain_device *device, u8 *lun,
1132 struct sas_tmf_task *tmf)
1133{
1134 struct sas_ssp_task ssp_task;
1135
1136 if (!(device->tproto & SAS_PROTOCOL_SSP))
1137 return TMF_RESP_FUNC_ESUPP;
1138
1139 memcpy(ssp_task.LUN, lun, 8);
1140
1141 return sas_execute_tmf(device, &ssp_task, sizeof(ssp_task), -1, tmf);
1142}
1143
1144int sas_abort_task_set(struct domain_device *dev, u8 *lun)
1145{
1146 struct sas_tmf_task tmf_task = {
1147 .tmf = TMF_ABORT_TASK_SET,
1148 };
1149
1150 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1151}
1152EXPORT_SYMBOL_GPL(sas_abort_task_set);
1153
1154int sas_clear_task_set(struct domain_device *dev, u8 *lun)
1155{
1156 struct sas_tmf_task tmf_task = {
1157 .tmf = TMF_CLEAR_TASK_SET,
1158 };
1159
1160 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1161}
1162EXPORT_SYMBOL_GPL(sas_clear_task_set);
1163
1164int sas_lu_reset(struct domain_device *dev, u8 *lun)
1165{
1166 struct sas_tmf_task tmf_task = {
1167 .tmf = TMF_LU_RESET,
1168 };
1169
1170 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1171}
1172EXPORT_SYMBOL_GPL(sas_lu_reset);
1173
1174int sas_query_task(struct sas_task *task, u16 tag)
1175{
1176 struct sas_tmf_task tmf_task = {
1177 .tmf = TMF_QUERY_TASK,
1178 .tag_of_task_to_be_managed = tag,
1179 };
1180 struct scsi_cmnd *cmnd = task->uldd_task;
1181 struct domain_device *dev = task->dev;
1182 struct scsi_lun lun;
1183
1184 int_to_scsilun(cmnd->device->lun, &lun);
1185
1186 return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1187}
1188EXPORT_SYMBOL_GPL(sas_query_task);
1189
1190int sas_abort_task(struct sas_task *task, u16 tag)
1191{
1192 struct sas_tmf_task tmf_task = {
1193 .tmf = TMF_ABORT_TASK,
1194 .tag_of_task_to_be_managed = tag,
1195 };
1196 struct scsi_cmnd *cmnd = task->uldd_task;
1197 struct domain_device *dev = task->dev;
1198 struct scsi_lun lun;
1199
1200 int_to_scsilun(cmnd->device->lun, &lun);
1201
1202 return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1203}
1204EXPORT_SYMBOL_GPL(sas_abort_task);
1205
1206/*
1207 * Tell an upper layer that it needs to initiate an abort for a given task.
1208 * This should only ever be called by an LLDD.
1209 */
1210void sas_task_abort(struct sas_task *task)
1211{
1212 struct scsi_cmnd *sc = task->uldd_task;
1213
1214 /* Escape for libsas internal commands */
1215 if (!sc) {
1216 struct sas_task_slow *slow = task->slow_task;
1217
1218 if (!slow)
1219 return;
1220 if (!del_timer(&slow->timer))
1221 return;
1222 slow->timer.function(&slow->timer);
1223 return;
1224 }
1225
1226 if (dev_is_sata(task->dev))
1227 sas_ata_task_abort(task);
1228 else
1229 blk_abort_request(scsi_cmd_to_rq(sc));
1230}
1231EXPORT_SYMBOL_GPL(sas_task_abort);
1232
1233int sas_slave_alloc(struct scsi_device *sdev)
1234{
1235 if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
1236 return -ENXIO;
1237
1238 return 0;
1239}
1240EXPORT_SYMBOL_GPL(sas_slave_alloc);
1241
1242void sas_target_destroy(struct scsi_target *starget)
1243{
1244 struct domain_device *found_dev = starget->hostdata;
1245
1246 if (!found_dev)
1247 return;
1248
1249 starget->hostdata = NULL;
1250 sas_put_device(found_dev);
1251}
1252EXPORT_SYMBOL_GPL(sas_target_destroy);
1253
1254#define SAS_STRING_ADDR_SIZE 16
1255
1256int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1257{
1258 int res;
1259 const struct firmware *fw;
1260
1261 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1262 if (res)
1263 return res;
1264
1265 if (fw->size < SAS_STRING_ADDR_SIZE) {
1266 res = -ENODEV;
1267 goto out;
1268 }
1269
1270 res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
1271 if (res)
1272 goto out;
1273
1274out:
1275 release_firmware(fw);
1276 return res;
1277}
1278EXPORT_SYMBOL_GPL(sas_request_addr);
1279