1 /*
2 * Serial Attached SCSI (SAS) class SCSI Host glue.
3 *
4 * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
5 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
6 *
7 * This file is licensed under GPLv2.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 *
24 */
25
26 #include <linux/kthread.h>
27 #include <linux/firmware.h>
28 #include <linux/export.h>
29 #include <linux/ctype.h>
30
31 #include "sas_internal.h"
32
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_tcq.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_eh.h>
38 #include <scsi/scsi_transport.h>
39 #include <scsi/scsi_transport_sas.h>
40 #include <scsi/sas_ata.h>
41 #include "../scsi_sas_internal.h"
42 #include "../scsi_transport_api.h"
43 #include "../scsi_priv.h"
44
45 #include <linux/err.h>
46 #include <linux/blkdev.h>
47 #include <linux/freezer.h>
48 #include <linux/gfp.h>
49 #include <linux/scatterlist.h>
50 #include <linux/libata.h>
51
52 /* record final status and free the task */
sas_end_task(struct scsi_cmnd * sc,struct sas_task * task)53 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
54 {
55 struct task_status_struct *ts = &task->task_status;
56 int hs = 0, stat = 0;
57
58 if (ts->resp == SAS_TASK_UNDELIVERED) {
59 /* transport error */
60 hs = DID_NO_CONNECT;
61 } else { /* ts->resp == SAS_TASK_COMPLETE */
62 /* task delivered, what happened afterwards? */
63 switch (ts->stat) {
64 case SAS_DEV_NO_RESPONSE:
65 case SAS_INTERRUPTED:
66 case SAS_PHY_DOWN:
67 case SAS_NAK_R_ERR:
68 case SAS_OPEN_TO:
69 hs = DID_NO_CONNECT;
70 break;
71 case SAS_DATA_UNDERRUN:
72 scsi_set_resid(sc, ts->residual);
73 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
74 hs = DID_ERROR;
75 break;
76 case SAS_DATA_OVERRUN:
77 hs = DID_ERROR;
78 break;
79 case SAS_QUEUE_FULL:
80 hs = DID_SOFT_ERROR; /* retry */
81 break;
82 case SAS_DEVICE_UNKNOWN:
83 hs = DID_BAD_TARGET;
84 break;
85 case SAS_SG_ERR:
86 hs = DID_PARITY;
87 break;
88 case SAS_OPEN_REJECT:
89 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
90 hs = DID_SOFT_ERROR; /* retry */
91 else
92 hs = DID_ERROR;
93 break;
94 case SAS_PROTO_RESPONSE:
95 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
96 "task; please report this\n",
97 task->dev->port->ha->sas_ha_name);
98 break;
99 case SAS_ABORTED_TASK:
100 hs = DID_ABORT;
101 break;
102 case SAM_STAT_CHECK_CONDITION:
103 memcpy(sc->sense_buffer, ts->buf,
104 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
105 stat = SAM_STAT_CHECK_CONDITION;
106 break;
107 default:
108 stat = ts->stat;
109 break;
110 }
111 }
112
113 sc->result = (hs << 16) | stat;
114 ASSIGN_SAS_TASK(sc, NULL);
115 sas_free_task(task);
116 }
117
sas_scsi_task_done(struct sas_task * task)118 static void sas_scsi_task_done(struct sas_task *task)
119 {
120 struct scsi_cmnd *sc = task->uldd_task;
121 struct domain_device *dev = task->dev;
122 struct sas_ha_struct *ha = dev->port->ha;
123 unsigned long flags;
124
125 spin_lock_irqsave(&dev->done_lock, flags);
126 if (test_bit(SAS_HA_FROZEN, &ha->state))
127 task = NULL;
128 else
129 ASSIGN_SAS_TASK(sc, NULL);
130 spin_unlock_irqrestore(&dev->done_lock, flags);
131
132 if (unlikely(!task)) {
133 /* task will be completed by the error handler */
134 SAS_DPRINTK("task done but aborted\n");
135 return;
136 }
137
138 if (unlikely(!sc)) {
139 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
140 sas_free_task(task);
141 return;
142 }
143
144 sas_end_task(sc, task);
145 sc->scsi_done(sc);
146 }
147
sas_create_task(struct scsi_cmnd * cmd,struct domain_device * dev,gfp_t gfp_flags)148 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
149 struct domain_device *dev,
150 gfp_t gfp_flags)
151 {
152 struct sas_task *task = sas_alloc_task(gfp_flags);
153 struct scsi_lun lun;
154
155 if (!task)
156 return NULL;
157
158 task->uldd_task = cmd;
159 ASSIGN_SAS_TASK(cmd, task);
160
161 task->dev = dev;
162 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
163
164 task->ssp_task.retry_count = 1;
165 int_to_scsilun(cmd->device->lun, &lun);
166 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
167 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
168 task->ssp_task.cmd = cmd;
169
170 task->scatter = scsi_sglist(cmd);
171 task->num_scatter = scsi_sg_count(cmd);
172 task->total_xfer_len = scsi_bufflen(cmd);
173 task->data_dir = cmd->sc_data_direction;
174
175 task->task_done = sas_scsi_task_done;
176
177 return task;
178 }
179
sas_queuecommand(struct Scsi_Host * host,struct scsi_cmnd * cmd)180 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
181 {
182 struct sas_internal *i = to_sas_internal(host->transportt);
183 struct domain_device *dev = cmd_to_domain_dev(cmd);
184 struct sas_task *task;
185 int res = 0;
186
187 /* If the device fell off, no sense in issuing commands */
188 if (test_bit(SAS_DEV_GONE, &dev->state)) {
189 cmd->result = DID_BAD_TARGET << 16;
190 goto out_done;
191 }
192
193 if (dev_is_sata(dev)) {
194 spin_lock_irq(dev->sata_dev.ap->lock);
195 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
196 spin_unlock_irq(dev->sata_dev.ap->lock);
197 return res;
198 }
199
200 task = sas_create_task(cmd, dev, GFP_ATOMIC);
201 if (!task)
202 return SCSI_MLQUEUE_HOST_BUSY;
203
204 res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
205 if (res)
206 goto out_free_task;
207 return 0;
208
209 out_free_task:
210 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
211 ASSIGN_SAS_TASK(cmd, NULL);
212 sas_free_task(task);
213 if (res == -SAS_QUEUE_FULL)
214 cmd->result = DID_SOFT_ERROR << 16; /* retry */
215 else
216 cmd->result = DID_ERROR << 16;
217 out_done:
218 cmd->scsi_done(cmd);
219 return 0;
220 }
221
sas_eh_finish_cmd(struct scsi_cmnd * cmd)222 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
223 {
224 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
225 struct domain_device *dev = cmd_to_domain_dev(cmd);
226 struct sas_task *task = TO_SAS_TASK(cmd);
227
228 /* At this point, we only get called following an actual abort
229 * of the task, so we should be guaranteed not to be racing with
230 * any completions from the LLD. Task is freed after this.
231 */
232 sas_end_task(cmd, task);
233
234 if (dev_is_sata(dev)) {
235 /* defer commands to libata so that libata EH can
236 * handle ata qcs correctly
237 */
238 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
239 return;
240 }
241
242 /* now finish the command and move it on to the error
243 * handler done list, this also takes it off the
244 * error handler pending list.
245 */
246 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
247 }
248
sas_scsi_clear_queue_lu(struct list_head * error_q,struct scsi_cmnd * my_cmd)249 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
250 {
251 struct scsi_cmnd *cmd, *n;
252
253 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
254 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
255 cmd->device->lun == my_cmd->device->lun)
256 sas_eh_finish_cmd(cmd);
257 }
258 }
259
sas_scsi_clear_queue_I_T(struct list_head * error_q,struct domain_device * dev)260 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
261 struct domain_device *dev)
262 {
263 struct scsi_cmnd *cmd, *n;
264
265 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
266 struct domain_device *x = cmd_to_domain_dev(cmd);
267
268 if (x == dev)
269 sas_eh_finish_cmd(cmd);
270 }
271 }
272
sas_scsi_clear_queue_port(struct list_head * error_q,struct asd_sas_port * port)273 static void sas_scsi_clear_queue_port(struct list_head *error_q,
274 struct asd_sas_port *port)
275 {
276 struct scsi_cmnd *cmd, *n;
277
278 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
279 struct domain_device *dev = cmd_to_domain_dev(cmd);
280 struct asd_sas_port *x = dev->port;
281
282 if (x == port)
283 sas_eh_finish_cmd(cmd);
284 }
285 }
286
287 enum task_disposition {
288 TASK_IS_DONE,
289 TASK_IS_ABORTED,
290 TASK_IS_AT_LU,
291 TASK_IS_NOT_AT_LU,
292 TASK_ABORT_FAILED,
293 };
294
sas_scsi_find_task(struct sas_task * task)295 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
296 {
297 unsigned long flags;
298 int i, res;
299 struct sas_internal *si =
300 to_sas_internal(task->dev->port->ha->core.shost->transportt);
301
302 for (i = 0; i < 5; i++) {
303 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
304 res = si->dft->lldd_abort_task(task);
305
306 spin_lock_irqsave(&task->task_state_lock, flags);
307 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
308 spin_unlock_irqrestore(&task->task_state_lock, flags);
309 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
310 task);
311 return TASK_IS_DONE;
312 }
313 spin_unlock_irqrestore(&task->task_state_lock, flags);
314
315 if (res == TMF_RESP_FUNC_COMPLETE) {
316 SAS_DPRINTK("%s: task 0x%p is aborted\n",
317 __func__, task);
318 return TASK_IS_ABORTED;
319 } else if (si->dft->lldd_query_task) {
320 SAS_DPRINTK("%s: querying task 0x%p\n",
321 __func__, task);
322 res = si->dft->lldd_query_task(task);
323 switch (res) {
324 case TMF_RESP_FUNC_SUCC:
325 SAS_DPRINTK("%s: task 0x%p at LU\n",
326 __func__, task);
327 return TASK_IS_AT_LU;
328 case TMF_RESP_FUNC_COMPLETE:
329 SAS_DPRINTK("%s: task 0x%p not at LU\n",
330 __func__, task);
331 return TASK_IS_NOT_AT_LU;
332 case TMF_RESP_FUNC_FAILED:
333 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
334 __func__, task);
335 return TASK_ABORT_FAILED;
336 }
337
338 }
339 }
340 return res;
341 }
342
sas_recover_lu(struct domain_device * dev,struct scsi_cmnd * cmd)343 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
344 {
345 int res = TMF_RESP_FUNC_FAILED;
346 struct scsi_lun lun;
347 struct sas_internal *i =
348 to_sas_internal(dev->port->ha->core.shost->transportt);
349
350 int_to_scsilun(cmd->device->lun, &lun);
351
352 SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
353 SAS_ADDR(dev->sas_addr),
354 cmd->device->lun);
355
356 if (i->dft->lldd_abort_task_set)
357 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
358
359 if (res == TMF_RESP_FUNC_FAILED) {
360 if (i->dft->lldd_clear_task_set)
361 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
362 }
363
364 if (res == TMF_RESP_FUNC_FAILED) {
365 if (i->dft->lldd_lu_reset)
366 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
367 }
368
369 return res;
370 }
371
sas_recover_I_T(struct domain_device * dev)372 static int sas_recover_I_T(struct domain_device *dev)
373 {
374 int res = TMF_RESP_FUNC_FAILED;
375 struct sas_internal *i =
376 to_sas_internal(dev->port->ha->core.shost->transportt);
377
378 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
379 SAS_ADDR(dev->sas_addr));
380
381 if (i->dft->lldd_I_T_nexus_reset)
382 res = i->dft->lldd_I_T_nexus_reset(dev);
383
384 return res;
385 }
386
387 /* take a reference on the last known good phy for this device */
sas_get_local_phy(struct domain_device * dev)388 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
389 {
390 struct sas_ha_struct *ha = dev->port->ha;
391 struct sas_phy *phy;
392 unsigned long flags;
393
394 /* a published domain device always has a valid phy, it may be
395 * stale, but it is never NULL
396 */
397 BUG_ON(!dev->phy);
398
399 spin_lock_irqsave(&ha->phy_port_lock, flags);
400 phy = dev->phy;
401 get_device(&phy->dev);
402 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
403
404 return phy;
405 }
406 EXPORT_SYMBOL_GPL(sas_get_local_phy);
407
sas_wait_eh(struct domain_device * dev)408 static void sas_wait_eh(struct domain_device *dev)
409 {
410 struct sas_ha_struct *ha = dev->port->ha;
411 DEFINE_WAIT(wait);
412
413 if (dev_is_sata(dev)) {
414 ata_port_wait_eh(dev->sata_dev.ap);
415 return;
416 }
417 retry:
418 spin_lock_irq(&ha->lock);
419
420 while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
421 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
422 spin_unlock_irq(&ha->lock);
423 schedule();
424 spin_lock_irq(&ha->lock);
425 }
426 finish_wait(&ha->eh_wait_q, &wait);
427
428 spin_unlock_irq(&ha->lock);
429
430 /* make sure SCSI EH is complete */
431 if (scsi_host_in_recovery(ha->core.shost)) {
432 msleep(10);
433 goto retry;
434 }
435 }
436 EXPORT_SYMBOL(sas_wait_eh);
437
sas_queue_reset(struct domain_device * dev,int reset_type,u64 lun,int wait)438 static int sas_queue_reset(struct domain_device *dev, int reset_type,
439 u64 lun, int wait)
440 {
441 struct sas_ha_struct *ha = dev->port->ha;
442 int scheduled = 0, tries = 100;
443
444 /* ata: promote lun reset to bus reset */
445 if (dev_is_sata(dev)) {
446 sas_ata_schedule_reset(dev);
447 if (wait)
448 sas_ata_wait_eh(dev);
449 return SUCCESS;
450 }
451
452 while (!scheduled && tries--) {
453 spin_lock_irq(&ha->lock);
454 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
455 !test_bit(reset_type, &dev->state)) {
456 scheduled = 1;
457 ha->eh_active++;
458 list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
459 set_bit(SAS_DEV_EH_PENDING, &dev->state);
460 set_bit(reset_type, &dev->state);
461 int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
462 scsi_schedule_eh(ha->core.shost);
463 }
464 spin_unlock_irq(&ha->lock);
465
466 if (wait)
467 sas_wait_eh(dev);
468
469 if (scheduled)
470 return SUCCESS;
471 }
472
473 SAS_DPRINTK("%s reset of %s failed\n",
474 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
475 dev_name(&dev->rphy->dev));
476
477 return FAILED;
478 }
479
sas_eh_abort_handler(struct scsi_cmnd * cmd)480 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
481 {
482 int res;
483 struct sas_task *task = TO_SAS_TASK(cmd);
484 struct Scsi_Host *host = cmd->device->host;
485 struct sas_internal *i = to_sas_internal(host->transportt);
486
487 if (current != host->ehandler)
488 return FAILED;
489
490 if (!i->dft->lldd_abort_task)
491 return FAILED;
492
493 res = i->dft->lldd_abort_task(task);
494 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
495 return SUCCESS;
496
497 return FAILED;
498 }
499 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
500
501 /* Attempt to send a LUN reset message to a device */
sas_eh_device_reset_handler(struct scsi_cmnd * cmd)502 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
503 {
504 int res;
505 struct scsi_lun lun;
506 struct Scsi_Host *host = cmd->device->host;
507 struct domain_device *dev = cmd_to_domain_dev(cmd);
508 struct sas_internal *i = to_sas_internal(host->transportt);
509
510 if (current != host->ehandler)
511 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
512
513 int_to_scsilun(cmd->device->lun, &lun);
514
515 if (!i->dft->lldd_lu_reset)
516 return FAILED;
517
518 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
519 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
520 return SUCCESS;
521
522 return FAILED;
523 }
524
sas_eh_bus_reset_handler(struct scsi_cmnd * cmd)525 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
526 {
527 int res;
528 struct Scsi_Host *host = cmd->device->host;
529 struct domain_device *dev = cmd_to_domain_dev(cmd);
530 struct sas_internal *i = to_sas_internal(host->transportt);
531
532 if (current != host->ehandler)
533 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
534
535 if (!i->dft->lldd_I_T_nexus_reset)
536 return FAILED;
537
538 res = i->dft->lldd_I_T_nexus_reset(dev);
539 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
540 res == -ENODEV)
541 return SUCCESS;
542
543 return FAILED;
544 }
545
546 /* Try to reset a device */
try_to_reset_cmd_device(struct scsi_cmnd * cmd)547 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
548 {
549 int res;
550 struct Scsi_Host *shost = cmd->device->host;
551
552 if (!shost->hostt->eh_device_reset_handler)
553 goto try_bus_reset;
554
555 res = shost->hostt->eh_device_reset_handler(cmd);
556 if (res == SUCCESS)
557 return res;
558
559 try_bus_reset:
560 if (shost->hostt->eh_bus_reset_handler)
561 return shost->hostt->eh_bus_reset_handler(cmd);
562
563 return FAILED;
564 }
565
sas_eh_handle_sas_errors(struct Scsi_Host * shost,struct list_head * work_q)566 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
567 {
568 struct scsi_cmnd *cmd, *n;
569 enum task_disposition res = TASK_IS_DONE;
570 int tmf_resp, need_reset;
571 struct sas_internal *i = to_sas_internal(shost->transportt);
572 unsigned long flags;
573 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
574 LIST_HEAD(done);
575
576 /* clean out any commands that won the completion vs eh race */
577 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
578 struct domain_device *dev = cmd_to_domain_dev(cmd);
579 struct sas_task *task;
580
581 spin_lock_irqsave(&dev->done_lock, flags);
582 /* by this point the lldd has either observed
583 * SAS_HA_FROZEN and is leaving the task alone, or has
584 * won the race with eh and decided to complete it
585 */
586 task = TO_SAS_TASK(cmd);
587 spin_unlock_irqrestore(&dev->done_lock, flags);
588
589 if (!task)
590 list_move_tail(&cmd->eh_entry, &done);
591 }
592
593 Again:
594 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
595 struct sas_task *task = TO_SAS_TASK(cmd);
596
597 list_del_init(&cmd->eh_entry);
598
599 spin_lock_irqsave(&task->task_state_lock, flags);
600 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
601 spin_unlock_irqrestore(&task->task_state_lock, flags);
602
603 if (need_reset) {
604 SAS_DPRINTK("%s: task 0x%p requests reset\n",
605 __func__, task);
606 goto reset;
607 }
608
609 SAS_DPRINTK("trying to find task 0x%p\n", task);
610 res = sas_scsi_find_task(task);
611
612 cmd->eh_eflags = 0;
613
614 switch (res) {
615 case TASK_IS_DONE:
616 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
617 task);
618 sas_eh_finish_cmd(cmd);
619 continue;
620 case TASK_IS_ABORTED:
621 SAS_DPRINTK("%s: task 0x%p is aborted\n",
622 __func__, task);
623 sas_eh_finish_cmd(cmd);
624 continue;
625 case TASK_IS_AT_LU:
626 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
627 reset:
628 tmf_resp = sas_recover_lu(task->dev, cmd);
629 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
630 SAS_DPRINTK("dev %016llx LU %llx is "
631 "recovered\n",
632 SAS_ADDR(task->dev),
633 cmd->device->lun);
634 sas_eh_finish_cmd(cmd);
635 sas_scsi_clear_queue_lu(work_q, cmd);
636 goto Again;
637 }
638 /* fallthrough */
639 case TASK_IS_NOT_AT_LU:
640 case TASK_ABORT_FAILED:
641 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
642 task);
643 tmf_resp = sas_recover_I_T(task->dev);
644 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
645 tmf_resp == -ENODEV) {
646 struct domain_device *dev = task->dev;
647 SAS_DPRINTK("I_T %016llx recovered\n",
648 SAS_ADDR(task->dev->sas_addr));
649 sas_eh_finish_cmd(cmd);
650 sas_scsi_clear_queue_I_T(work_q, dev);
651 goto Again;
652 }
653 /* Hammer time :-) */
654 try_to_reset_cmd_device(cmd);
655 if (i->dft->lldd_clear_nexus_port) {
656 struct asd_sas_port *port = task->dev->port;
657 SAS_DPRINTK("clearing nexus for port:%d\n",
658 port->id);
659 res = i->dft->lldd_clear_nexus_port(port);
660 if (res == TMF_RESP_FUNC_COMPLETE) {
661 SAS_DPRINTK("clear nexus port:%d "
662 "succeeded\n", port->id);
663 sas_eh_finish_cmd(cmd);
664 sas_scsi_clear_queue_port(work_q,
665 port);
666 goto Again;
667 }
668 }
669 if (i->dft->lldd_clear_nexus_ha) {
670 SAS_DPRINTK("clear nexus ha\n");
671 res = i->dft->lldd_clear_nexus_ha(ha);
672 if (res == TMF_RESP_FUNC_COMPLETE) {
673 SAS_DPRINTK("clear nexus ha "
674 "succeeded\n");
675 sas_eh_finish_cmd(cmd);
676 goto clear_q;
677 }
678 }
679 /* If we are here -- this means that no amount
680 * of effort could recover from errors. Quite
681 * possibly the HA just disappeared.
682 */
683 SAS_DPRINTK("error from device %llx, LUN %llx "
684 "couldn't be recovered in any way\n",
685 SAS_ADDR(task->dev->sas_addr),
686 cmd->device->lun);
687
688 sas_eh_finish_cmd(cmd);
689 goto clear_q;
690 }
691 }
692 out:
693 list_splice_tail(&done, work_q);
694 list_splice_tail_init(&ha->eh_ata_q, work_q);
695 return;
696
697 clear_q:
698 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
699 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
700 sas_eh_finish_cmd(cmd);
701 goto out;
702 }
703
sas_eh_handle_resets(struct Scsi_Host * shost)704 static void sas_eh_handle_resets(struct Scsi_Host *shost)
705 {
706 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
707 struct sas_internal *i = to_sas_internal(shost->transportt);
708
709 /* handle directed resets to sas devices */
710 spin_lock_irq(&ha->lock);
711 while (!list_empty(&ha->eh_dev_q)) {
712 struct domain_device *dev;
713 struct ssp_device *ssp;
714
715 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
716 list_del_init(&ssp->eh_list_node);
717 dev = container_of(ssp, typeof(*dev), ssp_dev);
718 kref_get(&dev->kref);
719 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
720
721 spin_unlock_irq(&ha->lock);
722
723 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
724 i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
725
726 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
727 i->dft->lldd_I_T_nexus_reset(dev);
728
729 sas_put_device(dev);
730 spin_lock_irq(&ha->lock);
731 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
732 ha->eh_active--;
733 }
734 spin_unlock_irq(&ha->lock);
735 }
736
737
sas_scsi_recover_host(struct Scsi_Host * shost)738 void sas_scsi_recover_host(struct Scsi_Host *shost)
739 {
740 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
741 LIST_HEAD(eh_work_q);
742 int tries = 0;
743 bool retry;
744
745 retry:
746 tries++;
747 retry = true;
748 spin_lock_irq(shost->host_lock);
749 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
750 spin_unlock_irq(shost->host_lock);
751
752 SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
753 __func__, atomic_read(&shost->host_busy), shost->host_failed);
754 /*
755 * Deal with commands that still have SAS tasks (i.e. they didn't
756 * complete via the normal sas_task completion mechanism),
757 * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
758 */
759 set_bit(SAS_HA_FROZEN, &ha->state);
760 sas_eh_handle_sas_errors(shost, &eh_work_q);
761 clear_bit(SAS_HA_FROZEN, &ha->state);
762 if (list_empty(&eh_work_q))
763 goto out;
764
765 /*
766 * Now deal with SCSI commands that completed ok but have a an error
767 * code (and hopefully sense data) attached. This is roughly what
768 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
769 * command we see here has no sas_task and is thus unknown to the HA.
770 */
771 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
772 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
773 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
774
775 out:
776 sas_eh_handle_resets(shost);
777
778 /* now link into libata eh --- if we have any ata devices */
779 sas_ata_strategy_handler(shost);
780
781 scsi_eh_flush_done_q(&ha->eh_done_q);
782
783 /* check if any new eh work was scheduled during the last run */
784 spin_lock_irq(&ha->lock);
785 if (ha->eh_active == 0) {
786 shost->host_eh_scheduled = 0;
787 retry = false;
788 }
789 spin_unlock_irq(&ha->lock);
790
791 if (retry)
792 goto retry;
793
794 SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
795 __func__, atomic_read(&shost->host_busy),
796 shost->host_failed, tries);
797 }
798
sas_scsi_timed_out(struct scsi_cmnd * cmd)799 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
800 {
801 scmd_dbg(cmd, "command %p timed out\n", cmd);
802
803 return BLK_EH_NOT_HANDLED;
804 }
805
sas_ioctl(struct scsi_device * sdev,int cmd,void __user * arg)806 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
807 {
808 struct domain_device *dev = sdev_to_domain_dev(sdev);
809
810 if (dev_is_sata(dev))
811 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
812
813 return -EINVAL;
814 }
815
sas_find_dev_by_rphy(struct sas_rphy * rphy)816 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
817 {
818 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
819 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
820 struct domain_device *found_dev = NULL;
821 int i;
822 unsigned long flags;
823
824 spin_lock_irqsave(&ha->phy_port_lock, flags);
825 for (i = 0; i < ha->num_phys; i++) {
826 struct asd_sas_port *port = ha->sas_port[i];
827 struct domain_device *dev;
828
829 spin_lock(&port->dev_list_lock);
830 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
831 if (rphy == dev->rphy) {
832 found_dev = dev;
833 spin_unlock(&port->dev_list_lock);
834 goto found;
835 }
836 }
837 spin_unlock(&port->dev_list_lock);
838 }
839 found:
840 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
841
842 return found_dev;
843 }
844
sas_target_alloc(struct scsi_target * starget)845 int sas_target_alloc(struct scsi_target *starget)
846 {
847 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
848 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
849
850 if (!found_dev)
851 return -ENODEV;
852
853 kref_get(&found_dev->kref);
854 starget->hostdata = found_dev;
855 return 0;
856 }
857
858 #define SAS_DEF_QD 256
859
sas_slave_configure(struct scsi_device * scsi_dev)860 int sas_slave_configure(struct scsi_device *scsi_dev)
861 {
862 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
863 struct sas_ha_struct *sas_ha;
864
865 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
866
867 if (dev_is_sata(dev)) {
868 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
869 return 0;
870 }
871
872 sas_ha = dev->port->ha;
873
874 sas_read_port_mode_page(scsi_dev);
875
876 if (scsi_dev->tagged_supported) {
877 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
878 } else {
879 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
880 "TCQ\n", SAS_ADDR(dev->sas_addr),
881 scsi_dev->lun);
882 scsi_change_queue_depth(scsi_dev, 1);
883 }
884
885 scsi_dev->allow_restart = 1;
886
887 return 0;
888 }
889
sas_change_queue_depth(struct scsi_device * sdev,int depth)890 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
891 {
892 struct domain_device *dev = sdev_to_domain_dev(sdev);
893
894 if (dev_is_sata(dev))
895 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
896
897 if (!sdev->tagged_supported)
898 depth = 1;
899 return scsi_change_queue_depth(sdev, depth);
900 }
901
sas_bios_param(struct scsi_device * scsi_dev,struct block_device * bdev,sector_t capacity,int * hsc)902 int sas_bios_param(struct scsi_device *scsi_dev,
903 struct block_device *bdev,
904 sector_t capacity, int *hsc)
905 {
906 hsc[0] = 255;
907 hsc[1] = 63;
908 sector_div(capacity, 255*63);
909 hsc[2] = capacity;
910
911 return 0;
912 }
913
914 /*
915 * Tell an upper layer that it needs to initiate an abort for a given task.
916 * This should only ever be called by an LLDD.
917 */
sas_task_abort(struct sas_task * task)918 void sas_task_abort(struct sas_task *task)
919 {
920 struct scsi_cmnd *sc = task->uldd_task;
921
922 /* Escape for libsas internal commands */
923 if (!sc) {
924 struct sas_task_slow *slow = task->slow_task;
925
926 if (!slow)
927 return;
928 if (!del_timer(&slow->timer))
929 return;
930 slow->timer.function(slow->timer.data);
931 return;
932 }
933
934 if (dev_is_sata(task->dev)) {
935 sas_ata_task_abort(task);
936 } else {
937 struct request_queue *q = sc->device->request_queue;
938 unsigned long flags;
939
940 spin_lock_irqsave(q->queue_lock, flags);
941 blk_abort_request(sc->request);
942 spin_unlock_irqrestore(q->queue_lock, flags);
943 }
944 }
945
sas_target_destroy(struct scsi_target * starget)946 void sas_target_destroy(struct scsi_target *starget)
947 {
948 struct domain_device *found_dev = starget->hostdata;
949
950 if (!found_dev)
951 return;
952
953 starget->hostdata = NULL;
954 sas_put_device(found_dev);
955 }
956
sas_parse_addr(u8 * sas_addr,const char * p)957 static void sas_parse_addr(u8 *sas_addr, const char *p)
958 {
959 int i;
960 for (i = 0; i < SAS_ADDR_SIZE; i++) {
961 u8 h, l;
962 if (!*p)
963 break;
964 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
965 p++;
966 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
967 p++;
968 sas_addr[i] = (h<<4) | l;
969 }
970 }
971
972 #define SAS_STRING_ADDR_SIZE 16
973
sas_request_addr(struct Scsi_Host * shost,u8 * addr)974 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
975 {
976 int res;
977 const struct firmware *fw;
978
979 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
980 if (res)
981 return res;
982
983 if (fw->size < SAS_STRING_ADDR_SIZE) {
984 res = -ENODEV;
985 goto out;
986 }
987
988 sas_parse_addr(addr, fw->data);
989
990 out:
991 release_firmware(fw);
992 return res;
993 }
994 EXPORT_SYMBOL_GPL(sas_request_addr);
995
996 EXPORT_SYMBOL_GPL(sas_queuecommand);
997 EXPORT_SYMBOL_GPL(sas_target_alloc);
998 EXPORT_SYMBOL_GPL(sas_slave_configure);
999 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1000 EXPORT_SYMBOL_GPL(sas_bios_param);
1001 EXPORT_SYMBOL_GPL(sas_task_abort);
1002 EXPORT_SYMBOL_GPL(sas_phy_reset);
1003 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1004 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1005 EXPORT_SYMBOL_GPL(sas_target_destroy);
1006 EXPORT_SYMBOL_GPL(sas_ioctl);
1007