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accel/qaic: Add AIC200 support
[drm/drm-misc.git] / drivers / scsi / libsas / sas_scsi_host.c
blobda11d32840e2723e3a53df54203c938ce801b0ce
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 */
37 static 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
99 static 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
129 static 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
160 int 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
189 out_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;
197 out_done:
198 scsi_done(cmd);
199 return 0;
200 }
201 EXPORT_SYMBOL_GPL(sas_queuecommand);
202
203 static 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
230 static 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
241 static 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
254 static 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
268 enum 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
276 static 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
324 static 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
353 static 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 */
369 struct 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 }
387 EXPORT_SYMBOL_GPL(sas_get_local_phy);
388
389 static 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
425 int 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 }
454 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
455
456 /* Attempt to send a LUN reset message to a device */
457 int 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 }
479 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
480
481 int 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 }
501 EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
502
503 /* Try to reset a device */
504 static 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
516 try_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
523 static 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
656 static 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
690 void 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
697 retry:
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
727 out:
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
751 int 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 }
760 EXPORT_SYMBOL_GPL(sas_ioctl);
761
762 struct 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
791 int 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 }
803 EXPORT_SYMBOL_GPL(sas_target_alloc);
804
805 #define SAS_DEF_QD 256
806
807 int sas_device_configure(struct scsi_device *scsi_dev,
808 struct queue_limits *lim)
809 {
810 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
811
812 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
813
814 if (dev_is_sata(dev)) {
815 ata_sas_device_configure(scsi_dev, lim, dev->sata_dev.ap);
816 return 0;
817 }
818
819 sas_read_port_mode_page(scsi_dev);
820
821 if (scsi_dev->tagged_supported) {
822 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
823 } else {
824 pr_notice("device %016llx, LUN 0x%llx doesn't support TCQ\n",
825 SAS_ADDR(dev->sas_addr), scsi_dev->lun);
826 scsi_change_queue_depth(scsi_dev, 1);
827 }
828
829 scsi_dev->allow_restart = 1;
830
831 return 0;
832 }
833 EXPORT_SYMBOL_GPL(sas_device_configure);
834
835 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
836 {
837 struct domain_device *dev = sdev_to_domain_dev(sdev);
838
839 if (dev_is_sata(dev))
840 return ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
841
842 if (!sdev->tagged_supported)
843 depth = 1;
844 return scsi_change_queue_depth(sdev, depth);
845 }
846 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
847
848 int sas_bios_param(struct scsi_device *scsi_dev,
849 struct block_device *bdev,
850 sector_t capacity, int *hsc)
851 {
852 hsc[0] = 255;
853 hsc[1] = 63;
854 sector_div(capacity, 255*63);
855 hsc[2] = capacity;
856
857 return 0;
858 }
859 EXPORT_SYMBOL_GPL(sas_bios_param);
860
861 void sas_task_internal_done(struct sas_task *task)
862 {
863 del_timer(&task->slow_task->timer);
864 complete(&task->slow_task->completion);
865 }
866
867 void sas_task_internal_timedout(struct timer_list *t)
868 {
869 struct sas_task_slow *slow = from_timer(slow, t, timer);
870 struct sas_task *task = slow->task;
871 bool is_completed = true;
872 unsigned long flags;
873
874 spin_lock_irqsave(&task->task_state_lock, flags);
875 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
876 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
877 is_completed = false;
878 }
879 spin_unlock_irqrestore(&task->task_state_lock, flags);
880
881 if (!is_completed)
882 complete(&task->slow_task->completion);
883 }
884
885 #define TASK_TIMEOUT (20 * HZ)
886 #define TASK_RETRY 3
887
888 static int sas_execute_internal_abort(struct domain_device *device,
889 enum sas_internal_abort type, u16 tag,
890 unsigned int qid, void *data)
891 {
892 struct sas_ha_struct *ha = device->port->ha;
893 struct sas_internal *i = to_sas_internal(ha->shost->transportt);
894 struct sas_task *task = NULL;
895 int res, retry;
896
897 for (retry = 0; retry < TASK_RETRY; retry++) {
898 task = sas_alloc_slow_task(GFP_KERNEL);
899 if (!task)
900 return -ENOMEM;
901
902 task->dev = device;
903 task->task_proto = SAS_PROTOCOL_INTERNAL_ABORT;
904 task->task_done = sas_task_internal_done;
905 task->slow_task->timer.function = sas_task_internal_timedout;
906 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
907 add_timer(&task->slow_task->timer);
908
909 task->abort_task.tag = tag;
910 task->abort_task.type = type;
911 task->abort_task.qid = qid;
912
913 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
914 if (res) {
915 del_timer_sync(&task->slow_task->timer);
916 pr_err("Executing internal abort failed %016llx (%d)\n",
917 SAS_ADDR(device->sas_addr), res);
918 break;
919 }
920
921 wait_for_completion(&task->slow_task->completion);
922 res = TMF_RESP_FUNC_FAILED;
923
924 /* Even if the internal abort timed out, return direct. */
925 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
926 bool quit = true;
927
928 if (i->dft->lldd_abort_timeout)
929 quit = i->dft->lldd_abort_timeout(task, data);
930 else
931 pr_err("Internal abort: timeout %016llx\n",
932 SAS_ADDR(device->sas_addr));
933 res = -EIO;
934 if (quit)
935 break;
936 }
937
938 if (task->task_status.resp == SAS_TASK_COMPLETE &&
939 task->task_status.stat == SAS_SAM_STAT_GOOD) {
940 res = TMF_RESP_FUNC_COMPLETE;
941 break;
942 }
943
944 if (task->task_status.resp == SAS_TASK_COMPLETE &&
945 task->task_status.stat == TMF_RESP_FUNC_SUCC) {
946 res = TMF_RESP_FUNC_SUCC;
947 break;
948 }
949
950 pr_err("Internal abort: task to dev %016llx response: 0x%x status 0x%x\n",
951 SAS_ADDR(device->sas_addr), task->task_status.resp,
952 task->task_status.stat);
953 sas_free_task(task);
954 task = NULL;
955 }
956 BUG_ON(retry == TASK_RETRY && task != NULL);
957 sas_free_task(task);
958 return res;
959 }
960
961 int sas_execute_internal_abort_single(struct domain_device *device, u16 tag,
962 unsigned int qid, void *data)
963 {
964 return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_SINGLE,
965 tag, qid, data);
966 }
967 EXPORT_SYMBOL_GPL(sas_execute_internal_abort_single);
968
969 int sas_execute_internal_abort_dev(struct domain_device *device,
970 unsigned int qid, void *data)
971 {
972 return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_DEV,
973 SCSI_NO_TAG, qid, data);
974 }
975 EXPORT_SYMBOL_GPL(sas_execute_internal_abort_dev);
976
977 int sas_execute_tmf(struct domain_device *device, void *parameter,
978 int para_len, int force_phy_id,
979 struct sas_tmf_task *tmf)
980 {
981 struct sas_task *task;
982 struct sas_internal *i =
983 to_sas_internal(device->port->ha->shost->transportt);
984 int res, retry;
985
986 for (retry = 0; retry < TASK_RETRY; retry++) {
987 task = sas_alloc_slow_task(GFP_KERNEL);
988 if (!task)
989 return -ENOMEM;
990
991 task->dev = device;
992 task->task_proto = device->tproto;
993
994 if (dev_is_sata(device)) {
995 task->ata_task.device_control_reg_update = 1;
996 if (force_phy_id >= 0) {
997 task->ata_task.force_phy = true;
998 task->ata_task.force_phy_id = force_phy_id;
999 }
1000 memcpy(&task->ata_task.fis, parameter, para_len);
1001 } else {
1002 memcpy(&task->ssp_task, parameter, para_len);
1003 }
1004
1005 task->task_done = sas_task_internal_done;
1006 task->tmf = tmf;
1007
1008 task->slow_task->timer.function = sas_task_internal_timedout;
1009 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
1010 add_timer(&task->slow_task->timer);
1011
1012 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
1013 if (res) {
1014 del_timer_sync(&task->slow_task->timer);
1015 pr_err("executing TMF task failed %016llx (%d)\n",
1016 SAS_ADDR(device->sas_addr), res);
1017 break;
1018 }
1019
1020 wait_for_completion(&task->slow_task->completion);
1021
1022 if (i->dft->lldd_tmf_exec_complete)
1023 i->dft->lldd_tmf_exec_complete(device);
1024
1025 res = TMF_RESP_FUNC_FAILED;
1026
1027 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
1028 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
1029 pr_err("TMF task timeout for %016llx and not done\n",
1030 SAS_ADDR(device->sas_addr));
1031 if (i->dft->lldd_tmf_aborted)
1032 i->dft->lldd_tmf_aborted(task);
1033 break;
1034 }
1035 pr_warn("TMF task timeout for %016llx and done\n",
1036 SAS_ADDR(device->sas_addr));
1037 }
1038
1039 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1040 task->task_status.stat == TMF_RESP_FUNC_COMPLETE) {
1041 res = TMF_RESP_FUNC_COMPLETE;
1042 break;
1043 }
1044
1045 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1046 task->task_status.stat == TMF_RESP_FUNC_SUCC) {
1047 res = TMF_RESP_FUNC_SUCC;
1048 break;
1049 }
1050
1051 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1052 task->task_status.stat == SAS_DATA_UNDERRUN) {
1053 /* no error, but return the number of bytes of
1054 * underrun
1055 */
1056 pr_warn("TMF task to dev %016llx resp: 0x%x sts 0x%x underrun\n",
1057 SAS_ADDR(device->sas_addr),
1058 task->task_status.resp,
1059 task->task_status.stat);
1060 res = task->task_status.residual;
1061 break;
1062 }
1063
1064 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1065 task->task_status.stat == SAS_DATA_OVERRUN) {
1066 pr_warn("TMF task blocked task error %016llx\n",
1067 SAS_ADDR(device->sas_addr));
1068 res = -EMSGSIZE;
1069 break;
1070 }
1071
1072 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1073 task->task_status.stat == SAS_OPEN_REJECT) {
1074 pr_warn("TMF task open reject failed %016llx\n",
1075 SAS_ADDR(device->sas_addr));
1076 res = -EIO;
1077 } else {
1078 pr_warn("TMF task to dev %016llx resp: 0x%x status 0x%x\n",
1079 SAS_ADDR(device->sas_addr),
1080 task->task_status.resp,
1081 task->task_status.stat);
1082 }
1083 sas_free_task(task);
1084 task = NULL;
1085 }
1086
1087 if (retry == TASK_RETRY)
1088 pr_warn("executing TMF for %016llx failed after %d attempts!\n",
1089 SAS_ADDR(device->sas_addr), TASK_RETRY);
1090 sas_free_task(task);
1091
1092 return res;
1093 }
1094
1095 static int sas_execute_ssp_tmf(struct domain_device *device, u8 *lun,
1096 struct sas_tmf_task *tmf)
1097 {
1098 struct sas_ssp_task ssp_task;
1099
1100 if (!(device->tproto & SAS_PROTOCOL_SSP))
1101 return TMF_RESP_FUNC_ESUPP;
1102
1103 memcpy(ssp_task.LUN, lun, 8);
1104
1105 return sas_execute_tmf(device, &ssp_task, sizeof(ssp_task), -1, tmf);
1106 }
1107
1108 int sas_abort_task_set(struct domain_device *dev, u8 *lun)
1109 {
1110 struct sas_tmf_task tmf_task = {
1111 .tmf = TMF_ABORT_TASK_SET,
1112 };
1113
1114 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1115 }
1116 EXPORT_SYMBOL_GPL(sas_abort_task_set);
1117
1118 int sas_clear_task_set(struct domain_device *dev, u8 *lun)
1119 {
1120 struct sas_tmf_task tmf_task = {
1121 .tmf = TMF_CLEAR_TASK_SET,
1122 };
1123
1124 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1125 }
1126 EXPORT_SYMBOL_GPL(sas_clear_task_set);
1127
1128 int sas_lu_reset(struct domain_device *dev, u8 *lun)
1129 {
1130 struct sas_tmf_task tmf_task = {
1131 .tmf = TMF_LU_RESET,
1132 };
1133
1134 return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1135 }
1136 EXPORT_SYMBOL_GPL(sas_lu_reset);
1137
1138 int sas_query_task(struct sas_task *task, u16 tag)
1139 {
1140 struct sas_tmf_task tmf_task = {
1141 .tmf = TMF_QUERY_TASK,
1142 .tag_of_task_to_be_managed = tag,
1143 };
1144 struct scsi_cmnd *cmnd = task->uldd_task;
1145 struct domain_device *dev = task->dev;
1146 struct scsi_lun lun;
1147
1148 int_to_scsilun(cmnd->device->lun, &lun);
1149
1150 return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1151 }
1152 EXPORT_SYMBOL_GPL(sas_query_task);
1153
1154 int sas_abort_task(struct sas_task *task, u16 tag)
1155 {
1156 struct sas_tmf_task tmf_task = {
1157 .tmf = TMF_ABORT_TASK,
1158 .tag_of_task_to_be_managed = tag,
1159 };
1160 struct scsi_cmnd *cmnd = task->uldd_task;
1161 struct domain_device *dev = task->dev;
1162 struct scsi_lun lun;
1163
1164 int_to_scsilun(cmnd->device->lun, &lun);
1165
1166 return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1167 }
1168 EXPORT_SYMBOL_GPL(sas_abort_task);
1169
1170 /*
1171 * Tell an upper layer that it needs to initiate an abort for a given task.
1172 * This should only ever be called by an LLDD.
1173 */
1174 void sas_task_abort(struct sas_task *task)
1175 {
1176 struct scsi_cmnd *sc = task->uldd_task;
1177
1178 /* Escape for libsas internal commands */
1179 if (!sc) {
1180 struct sas_task_slow *slow = task->slow_task;
1181
1182 if (!slow)
1183 return;
1184 if (!del_timer(&slow->timer))
1185 return;
1186 slow->timer.function(&slow->timer);
1187 return;
1188 }
1189
1190 if (dev_is_sata(task->dev))
1191 sas_ata_task_abort(task);
1192 else
1193 blk_abort_request(scsi_cmd_to_rq(sc));
1194 }
1195 EXPORT_SYMBOL_GPL(sas_task_abort);
1196
1197 int sas_slave_alloc(struct scsi_device *sdev)
1198 {
1199 if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
1200 return -ENXIO;
1201
1202 return 0;
1203 }
1204 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1205
1206 void sas_target_destroy(struct scsi_target *starget)
1207 {
1208 struct domain_device *found_dev = starget->hostdata;
1209
1210 if (!found_dev)
1211 return;
1212
1213 starget->hostdata = NULL;
1214 sas_put_device(found_dev);
1215 }
1216 EXPORT_SYMBOL_GPL(sas_target_destroy);
1217
1218 #define SAS_STRING_ADDR_SIZE 16
1219
1220 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1221 {
1222 int res;
1223 const struct firmware *fw;
1224
1225 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1226 if (res)
1227 return res;
1228
1229 if (fw->size < SAS_STRING_ADDR_SIZE) {
1230 res = -ENODEV;
1231 goto out;
1232 }
1233
1234 res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
1235 if (res)
1236 goto out;
1237
1238 out:
1239 release_firmware(fw);
1240 return res;
1241 }
1242 EXPORT_SYMBOL_GPL(sas_request_addr);
1243
Kernel DRM miscellaneous fixes and cross-tree changes