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[deliverable/linux.git] / drivers / scsi / libsas / sas_scsi_host.c
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 */
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 list_del_init(&task->list);
116 sas_free_task(task);
117 }
118
119 static void sas_scsi_task_done(struct sas_task *task)
120 {
121 struct scsi_cmnd *sc = task->uldd_task;
122 struct domain_device *dev = task->dev;
123 struct sas_ha_struct *ha = dev->port->ha;
124 unsigned long flags;
125
126 spin_lock_irqsave(&dev->done_lock, flags);
127 if (test_bit(SAS_HA_FROZEN, &ha->state))
128 task = NULL;
129 else
130 ASSIGN_SAS_TASK(sc, NULL);
131 spin_unlock_irqrestore(&dev->done_lock, flags);
132
133 if (unlikely(!task)) {
134 /* task will be completed by the error handler */
135 SAS_DPRINTK("task done but aborted\n");
136 return;
137 }
138
139 if (unlikely(!sc)) {
140 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
141 list_del_init(&task->list);
142 sas_free_task(task);
143 return;
144 }
145
146 sas_end_task(sc, task);
147 sc->scsi_done(sc);
148 }
149
150 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
151 struct domain_device *dev,
152 gfp_t gfp_flags)
153 {
154 struct sas_task *task = sas_alloc_task(gfp_flags);
155 struct scsi_lun lun;
156
157 if (!task)
158 return NULL;
159
160 task->uldd_task = cmd;
161 ASSIGN_SAS_TASK(cmd, task);
162
163 task->dev = dev;
164 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
165
166 task->ssp_task.retry_count = 1;
167 int_to_scsilun(cmd->device->lun, &lun);
168 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
169 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
170 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
171
172 task->scatter = scsi_sglist(cmd);
173 task->num_scatter = scsi_sg_count(cmd);
174 task->total_xfer_len = scsi_bufflen(cmd);
175 task->data_dir = cmd->sc_data_direction;
176
177 task->task_done = sas_scsi_task_done;
178
179 return task;
180 }
181
182 int sas_queue_up(struct sas_task *task)
183 {
184 struct sas_ha_struct *sas_ha = task->dev->port->ha;
185 struct scsi_core *core = &sas_ha->core;
186 unsigned long flags;
187 LIST_HEAD(list);
188
189 spin_lock_irqsave(&core->task_queue_lock, flags);
190 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
191 spin_unlock_irqrestore(&core->task_queue_lock, flags);
192 return -SAS_QUEUE_FULL;
193 }
194 list_add_tail(&task->list, &core->task_queue);
195 core->task_queue_size += 1;
196 spin_unlock_irqrestore(&core->task_queue_lock, flags);
197 wake_up_process(core->queue_thread);
198
199 return 0;
200 }
201
202 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
203 {
204 struct sas_internal *i = to_sas_internal(host->transportt);
205 struct domain_device *dev = cmd_to_domain_dev(cmd);
206 struct sas_ha_struct *sas_ha = dev->port->ha;
207 struct sas_task *task;
208 int res = 0;
209
210 /* If the device fell off, no sense in issuing commands */
211 if (test_bit(SAS_DEV_GONE, &dev->state)) {
212 cmd->result = DID_BAD_TARGET << 16;
213 goto out_done;
214 }
215
216 if (dev_is_sata(dev)) {
217 spin_lock_irq(dev->sata_dev.ap->lock);
218 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
219 spin_unlock_irq(dev->sata_dev.ap->lock);
220 return res;
221 }
222
223 task = sas_create_task(cmd, dev, GFP_ATOMIC);
224 if (!task)
225 return SCSI_MLQUEUE_HOST_BUSY;
226
227 /* Queue up, Direct Mode or Task Collector Mode. */
228 if (sas_ha->lldd_max_execute_num < 2)
229 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
230 else
231 res = sas_queue_up(task);
232
233 if (res)
234 goto out_free_task;
235 return 0;
236
237 out_free_task:
238 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
239 ASSIGN_SAS_TASK(cmd, NULL);
240 sas_free_task(task);
241 if (res == -SAS_QUEUE_FULL)
242 cmd->result = DID_SOFT_ERROR << 16; /* retry */
243 else
244 cmd->result = DID_ERROR << 16;
245 out_done:
246 cmd->scsi_done(cmd);
247 return 0;
248 }
249
250 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
251 {
252 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
253 struct sas_task *task = TO_SAS_TASK(cmd);
254
255 /* At this point, we only get called following an actual abort
256 * of the task, so we should be guaranteed not to be racing with
257 * any completions from the LLD. Task is freed after this.
258 */
259 sas_end_task(cmd, task);
260
261 /* now finish the command and move it on to the error
262 * handler done list, this also takes it off the
263 * error handler pending list.
264 */
265 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
266 }
267
268 static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
269 {
270 struct domain_device *dev = cmd_to_domain_dev(cmd);
271 struct sas_ha_struct *ha = dev->port->ha;
272 struct sas_task *task = TO_SAS_TASK(cmd);
273
274 if (!dev_is_sata(dev)) {
275 sas_eh_finish_cmd(cmd);
276 return;
277 }
278
279 /* report the timeout to libata */
280 sas_end_task(cmd, task);
281 list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
282 }
283
284 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
285 {
286 struct scsi_cmnd *cmd, *n;
287
288 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
289 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
290 cmd->device->lun == my_cmd->device->lun)
291 sas_eh_defer_cmd(cmd);
292 }
293 }
294
295 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
296 struct domain_device *dev)
297 {
298 struct scsi_cmnd *cmd, *n;
299
300 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
301 struct domain_device *x = cmd_to_domain_dev(cmd);
302
303 if (x == dev)
304 sas_eh_finish_cmd(cmd);
305 }
306 }
307
308 static void sas_scsi_clear_queue_port(struct list_head *error_q,
309 struct asd_sas_port *port)
310 {
311 struct scsi_cmnd *cmd, *n;
312
313 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
314 struct domain_device *dev = cmd_to_domain_dev(cmd);
315 struct asd_sas_port *x = dev->port;
316
317 if (x == port)
318 sas_eh_finish_cmd(cmd);
319 }
320 }
321
322 enum task_disposition {
323 TASK_IS_DONE,
324 TASK_IS_ABORTED,
325 TASK_IS_AT_LU,
326 TASK_IS_NOT_AT_HA,
327 TASK_IS_NOT_AT_LU,
328 TASK_ABORT_FAILED,
329 };
330
331 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
332 {
333 struct sas_ha_struct *ha = task->dev->port->ha;
334 unsigned long flags;
335 int i, res;
336 struct sas_internal *si =
337 to_sas_internal(task->dev->port->ha->core.shost->transportt);
338
339 if (ha->lldd_max_execute_num > 1) {
340 struct scsi_core *core = &ha->core;
341 struct sas_task *t, *n;
342
343 mutex_lock(&core->task_queue_flush);
344 spin_lock_irqsave(&core->task_queue_lock, flags);
345 list_for_each_entry_safe(t, n, &core->task_queue, list)
346 if (task == t) {
347 list_del_init(&t->list);
348 break;
349 }
350 spin_unlock_irqrestore(&core->task_queue_lock, flags);
351 mutex_unlock(&core->task_queue_flush);
352
353 if (task == t)
354 return TASK_IS_NOT_AT_HA;
355 }
356
357 for (i = 0; i < 5; i++) {
358 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
359 res = si->dft->lldd_abort_task(task);
360
361 spin_lock_irqsave(&task->task_state_lock, flags);
362 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
363 spin_unlock_irqrestore(&task->task_state_lock, flags);
364 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
365 task);
366 return TASK_IS_DONE;
367 }
368 spin_unlock_irqrestore(&task->task_state_lock, flags);
369
370 if (res == TMF_RESP_FUNC_COMPLETE) {
371 SAS_DPRINTK("%s: task 0x%p is aborted\n",
372 __func__, task);
373 return TASK_IS_ABORTED;
374 } else if (si->dft->lldd_query_task) {
375 SAS_DPRINTK("%s: querying task 0x%p\n",
376 __func__, task);
377 res = si->dft->lldd_query_task(task);
378 switch (res) {
379 case TMF_RESP_FUNC_SUCC:
380 SAS_DPRINTK("%s: task 0x%p at LU\n",
381 __func__, task);
382 return TASK_IS_AT_LU;
383 case TMF_RESP_FUNC_COMPLETE:
384 SAS_DPRINTK("%s: task 0x%p not at LU\n",
385 __func__, task);
386 return TASK_IS_NOT_AT_LU;
387 case TMF_RESP_FUNC_FAILED:
388 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
389 __func__, task);
390 return TASK_ABORT_FAILED;
391 }
392
393 }
394 }
395 return res;
396 }
397
398 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
399 {
400 int res = TMF_RESP_FUNC_FAILED;
401 struct scsi_lun lun;
402 struct sas_internal *i =
403 to_sas_internal(dev->port->ha->core.shost->transportt);
404
405 int_to_scsilun(cmd->device->lun, &lun);
406
407 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
408 SAS_ADDR(dev->sas_addr),
409 cmd->device->lun);
410
411 if (i->dft->lldd_abort_task_set)
412 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
413
414 if (res == TMF_RESP_FUNC_FAILED) {
415 if (i->dft->lldd_clear_task_set)
416 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
417 }
418
419 if (res == TMF_RESP_FUNC_FAILED) {
420 if (i->dft->lldd_lu_reset)
421 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
422 }
423
424 return res;
425 }
426
427 static int sas_recover_I_T(struct domain_device *dev)
428 {
429 int res = TMF_RESP_FUNC_FAILED;
430 struct sas_internal *i =
431 to_sas_internal(dev->port->ha->core.shost->transportt);
432
433 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
434 SAS_ADDR(dev->sas_addr));
435
436 if (i->dft->lldd_I_T_nexus_reset)
437 res = i->dft->lldd_I_T_nexus_reset(dev);
438
439 return res;
440 }
441
442 /* take a reference on the last known good phy for this device */
443 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
444 {
445 struct sas_ha_struct *ha = dev->port->ha;
446 struct sas_phy *phy;
447 unsigned long flags;
448
449 /* a published domain device always has a valid phy, it may be
450 * stale, but it is never NULL
451 */
452 BUG_ON(!dev->phy);
453
454 spin_lock_irqsave(&ha->phy_port_lock, flags);
455 phy = dev->phy;
456 get_device(&phy->dev);
457 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
458
459 return phy;
460 }
461 EXPORT_SYMBOL_GPL(sas_get_local_phy);
462
463 /* Attempt to send a LUN reset message to a device */
464 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
465 {
466 struct domain_device *dev = cmd_to_domain_dev(cmd);
467 struct sas_internal *i =
468 to_sas_internal(dev->port->ha->core.shost->transportt);
469 struct scsi_lun lun;
470 int res;
471
472 int_to_scsilun(cmd->device->lun, &lun);
473
474 if (!i->dft->lldd_lu_reset)
475 return FAILED;
476
477 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
478 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
479 return SUCCESS;
480
481 return FAILED;
482 }
483
484 /* Attempt to send a phy (bus) reset */
485 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
486 {
487 struct domain_device *dev = cmd_to_domain_dev(cmd);
488 struct sas_phy *phy = sas_get_local_phy(dev);
489 int res;
490
491 res = sas_phy_reset(phy, 1);
492 if (res)
493 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
494 kobject_name(&phy->dev.kobj),
495 res);
496 sas_put_local_phy(phy);
497
498 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
499 return SUCCESS;
500
501 return FAILED;
502 }
503
504 /* Try to reset a device */
505 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
506 {
507 int res;
508 struct Scsi_Host *shost = cmd->device->host;
509
510 if (!shost->hostt->eh_device_reset_handler)
511 goto try_bus_reset;
512
513 res = shost->hostt->eh_device_reset_handler(cmd);
514 if (res == SUCCESS)
515 return res;
516
517 try_bus_reset:
518 if (shost->hostt->eh_bus_reset_handler)
519 return shost->hostt->eh_bus_reset_handler(cmd);
520
521 return FAILED;
522 }
523
524 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
525 {
526 struct scsi_cmnd *cmd, *n;
527 enum task_disposition res = TASK_IS_DONE;
528 int tmf_resp, need_reset;
529 struct sas_internal *i = to_sas_internal(shost->transportt);
530 unsigned long flags;
531 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
532 LIST_HEAD(done);
533
534 /* clean out any commands that won the completion vs eh race */
535 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
536 struct domain_device *dev = cmd_to_domain_dev(cmd);
537 struct sas_task *task;
538
539 spin_lock_irqsave(&dev->done_lock, flags);
540 /* by this point the lldd has either observed
541 * SAS_HA_FROZEN and is leaving the task alone, or has
542 * won the race with eh and decided to complete it
543 */
544 task = TO_SAS_TASK(cmd);
545 spin_unlock_irqrestore(&dev->done_lock, flags);
546
547 if (!task)
548 list_move_tail(&cmd->eh_entry, &done);
549 }
550
551 Again:
552 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
553 struct sas_task *task = TO_SAS_TASK(cmd);
554
555 list_del_init(&cmd->eh_entry);
556
557 spin_lock_irqsave(&task->task_state_lock, flags);
558 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
559 spin_unlock_irqrestore(&task->task_state_lock, flags);
560
561 if (need_reset) {
562 SAS_DPRINTK("%s: task 0x%p requests reset\n",
563 __func__, task);
564 goto reset;
565 }
566
567 SAS_DPRINTK("trying to find task 0x%p\n", task);
568 res = sas_scsi_find_task(task);
569
570 cmd->eh_eflags = 0;
571
572 switch (res) {
573 case TASK_IS_NOT_AT_HA:
574 SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n",
575 __func__, task,
576 cmd->retries ? "retry" : "aborted");
577 if (cmd->retries)
578 cmd->retries--;
579 sas_eh_finish_cmd(cmd);
580 continue;
581 case TASK_IS_DONE:
582 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
583 task);
584 sas_eh_defer_cmd(cmd);
585 continue;
586 case TASK_IS_ABORTED:
587 SAS_DPRINTK("%s: task 0x%p is aborted\n",
588 __func__, task);
589 sas_eh_defer_cmd(cmd);
590 continue;
591 case TASK_IS_AT_LU:
592 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
593 reset:
594 tmf_resp = sas_recover_lu(task->dev, cmd);
595 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
596 SAS_DPRINTK("dev %016llx LU %x is "
597 "recovered\n",
598 SAS_ADDR(task->dev),
599 cmd->device->lun);
600 sas_eh_defer_cmd(cmd);
601 sas_scsi_clear_queue_lu(work_q, cmd);
602 goto Again;
603 }
604 /* fallthrough */
605 case TASK_IS_NOT_AT_LU:
606 case TASK_ABORT_FAILED:
607 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
608 task);
609 tmf_resp = sas_recover_I_T(task->dev);
610 if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
611 tmf_resp == -ENODEV) {
612 struct domain_device *dev = task->dev;
613 SAS_DPRINTK("I_T %016llx recovered\n",
614 SAS_ADDR(task->dev->sas_addr));
615 sas_eh_finish_cmd(cmd);
616 sas_scsi_clear_queue_I_T(work_q, dev);
617 goto Again;
618 }
619 /* Hammer time :-) */
620 try_to_reset_cmd_device(cmd);
621 if (i->dft->lldd_clear_nexus_port) {
622 struct asd_sas_port *port = task->dev->port;
623 SAS_DPRINTK("clearing nexus for port:%d\n",
624 port->id);
625 res = i->dft->lldd_clear_nexus_port(port);
626 if (res == TMF_RESP_FUNC_COMPLETE) {
627 SAS_DPRINTK("clear nexus port:%d "
628 "succeeded\n", port->id);
629 sas_eh_finish_cmd(cmd);
630 sas_scsi_clear_queue_port(work_q,
631 port);
632 goto Again;
633 }
634 }
635 if (i->dft->lldd_clear_nexus_ha) {
636 SAS_DPRINTK("clear nexus ha\n");
637 res = i->dft->lldd_clear_nexus_ha(ha);
638 if (res == TMF_RESP_FUNC_COMPLETE) {
639 SAS_DPRINTK("clear nexus ha "
640 "succeeded\n");
641 sas_eh_finish_cmd(cmd);
642 goto clear_q;
643 }
644 }
645 /* If we are here -- this means that no amount
646 * of effort could recover from errors. Quite
647 * possibly the HA just disappeared.
648 */
649 SAS_DPRINTK("error from device %llx, LUN %x "
650 "couldn't be recovered in any way\n",
651 SAS_ADDR(task->dev->sas_addr),
652 cmd->device->lun);
653
654 sas_eh_finish_cmd(cmd);
655 goto clear_q;
656 }
657 }
658 out:
659 list_splice_tail(&done, work_q);
660 list_splice_tail_init(&ha->eh_ata_q, work_q);
661 return;
662
663 clear_q:
664 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
665 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
666 sas_eh_finish_cmd(cmd);
667 goto out;
668 }
669
670 void sas_scsi_recover_host(struct Scsi_Host *shost)
671 {
672 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
673 unsigned long flags;
674 LIST_HEAD(eh_work_q);
675
676 spin_lock_irqsave(shost->host_lock, flags);
677 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
678 shost->host_eh_scheduled = 0;
679 spin_unlock_irqrestore(shost->host_lock, flags);
680
681 SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
682 __func__, shost->host_busy, shost->host_failed);
683 /*
684 * Deal with commands that still have SAS tasks (i.e. they didn't
685 * complete via the normal sas_task completion mechanism),
686 * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
687 */
688 set_bit(SAS_HA_FROZEN, &ha->state);
689 sas_eh_handle_sas_errors(shost, &eh_work_q);
690 clear_bit(SAS_HA_FROZEN, &ha->state);
691 if (list_empty(&eh_work_q))
692 goto out;
693
694 /*
695 * Now deal with SCSI commands that completed ok but have a an error
696 * code (and hopefully sense data) attached. This is roughly what
697 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
698 * command we see here has no sas_task and is thus unknown to the HA.
699 */
700 sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
701 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
702 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
703
704 out:
705 if (ha->lldd_max_execute_num > 1)
706 wake_up_process(ha->core.queue_thread);
707
708 /* now link into libata eh --- if we have any ata devices */
709 sas_ata_strategy_handler(shost);
710
711 scsi_eh_flush_done_q(&ha->eh_done_q);
712
713 SAS_DPRINTK("--- Exit %s: busy: %d failed: %d\n",
714 __func__, shost->host_busy, shost->host_failed);
715 }
716
717 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
718 {
719 scmd_printk(KERN_DEBUG, cmd, "command %p timed out\n", cmd);
720
721 return BLK_EH_NOT_HANDLED;
722 }
723
724 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
725 {
726 struct domain_device *dev = sdev_to_domain_dev(sdev);
727
728 if (dev_is_sata(dev))
729 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
730
731 return -EINVAL;
732 }
733
734 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
735 {
736 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
737 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
738 struct domain_device *found_dev = NULL;
739 int i;
740 unsigned long flags;
741
742 spin_lock_irqsave(&ha->phy_port_lock, flags);
743 for (i = 0; i < ha->num_phys; i++) {
744 struct asd_sas_port *port = ha->sas_port[i];
745 struct domain_device *dev;
746
747 spin_lock(&port->dev_list_lock);
748 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
749 if (rphy == dev->rphy) {
750 found_dev = dev;
751 spin_unlock(&port->dev_list_lock);
752 goto found;
753 }
754 }
755 spin_unlock(&port->dev_list_lock);
756 }
757 found:
758 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
759
760 return found_dev;
761 }
762
763 int sas_target_alloc(struct scsi_target *starget)
764 {
765 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
766 struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
767
768 if (!found_dev)
769 return -ENODEV;
770
771 kref_get(&found_dev->kref);
772 starget->hostdata = found_dev;
773 return 0;
774 }
775
776 #define SAS_DEF_QD 256
777
778 int sas_slave_configure(struct scsi_device *scsi_dev)
779 {
780 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
781 struct sas_ha_struct *sas_ha;
782
783 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
784
785 if (dev_is_sata(dev)) {
786 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
787 return 0;
788 }
789
790 sas_ha = dev->port->ha;
791
792 sas_read_port_mode_page(scsi_dev);
793
794 if (scsi_dev->tagged_supported) {
795 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
796 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
797 } else {
798 SAS_DPRINTK("device %llx, LUN %x doesn't support "
799 "TCQ\n", SAS_ADDR(dev->sas_addr),
800 scsi_dev->lun);
801 scsi_dev->tagged_supported = 0;
802 scsi_set_tag_type(scsi_dev, 0);
803 scsi_deactivate_tcq(scsi_dev, 1);
804 }
805
806 scsi_dev->allow_restart = 1;
807
808 return 0;
809 }
810
811 int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
812 {
813 struct domain_device *dev = sdev_to_domain_dev(sdev);
814
815 if (dev_is_sata(dev))
816 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
817 reason);
818
819 switch (reason) {
820 case SCSI_QDEPTH_DEFAULT:
821 case SCSI_QDEPTH_RAMP_UP:
822 if (!sdev->tagged_supported)
823 depth = 1;
824 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
825 break;
826 case SCSI_QDEPTH_QFULL:
827 scsi_track_queue_full(sdev, depth);
828 break;
829 default:
830 return -EOPNOTSUPP;
831 }
832
833 return depth;
834 }
835
836 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
837 {
838 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
839
840 if (dev_is_sata(dev))
841 return -EINVAL;
842
843 if (!scsi_dev->tagged_supported)
844 return 0;
845
846 scsi_deactivate_tcq(scsi_dev, 1);
847
848 scsi_set_tag_type(scsi_dev, qt);
849 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
850
851 return qt;
852 }
853
854 int sas_bios_param(struct scsi_device *scsi_dev,
855 struct block_device *bdev,
856 sector_t capacity, int *hsc)
857 {
858 hsc[0] = 255;
859 hsc[1] = 63;
860 sector_div(capacity, 255*63);
861 hsc[2] = capacity;
862
863 return 0;
864 }
865
866 /* ---------- Task Collector Thread implementation ---------- */
867
868 static void sas_queue(struct sas_ha_struct *sas_ha)
869 {
870 struct scsi_core *core = &sas_ha->core;
871 unsigned long flags;
872 LIST_HEAD(q);
873 int can_queue;
874 int res;
875 struct sas_internal *i = to_sas_internal(core->shost->transportt);
876
877 mutex_lock(&core->task_queue_flush);
878 spin_lock_irqsave(&core->task_queue_lock, flags);
879 while (!kthread_should_stop() &&
880 !list_empty(&core->task_queue) &&
881 !test_bit(SAS_HA_FROZEN, &sas_ha->state)) {
882
883 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
884 if (can_queue >= 0) {
885 can_queue = core->task_queue_size;
886 list_splice_init(&core->task_queue, &q);
887 } else {
888 struct list_head *a, *n;
889
890 can_queue = sas_ha->lldd_queue_size;
891 list_for_each_safe(a, n, &core->task_queue) {
892 list_move_tail(a, &q);
893 if (--can_queue == 0)
894 break;
895 }
896 can_queue = sas_ha->lldd_queue_size;
897 }
898 core->task_queue_size -= can_queue;
899 spin_unlock_irqrestore(&core->task_queue_lock, flags);
900 {
901 struct sas_task *task = list_entry(q.next,
902 struct sas_task,
903 list);
904 list_del_init(&q);
905 res = i->dft->lldd_execute_task(task, can_queue,
906 GFP_KERNEL);
907 if (unlikely(res))
908 __list_add(&q, task->list.prev, &task->list);
909 }
910 spin_lock_irqsave(&core->task_queue_lock, flags);
911 if (res) {
912 list_splice_init(&q, &core->task_queue); /*at head*/
913 core->task_queue_size += can_queue;
914 }
915 }
916 spin_unlock_irqrestore(&core->task_queue_lock, flags);
917 mutex_unlock(&core->task_queue_flush);
918 }
919
920 /**
921 * sas_queue_thread -- The Task Collector thread
922 * @_sas_ha: pointer to struct sas_ha
923 */
924 static int sas_queue_thread(void *_sas_ha)
925 {
926 struct sas_ha_struct *sas_ha = _sas_ha;
927
928 while (1) {
929 set_current_state(TASK_INTERRUPTIBLE);
930 schedule();
931 sas_queue(sas_ha);
932 if (kthread_should_stop())
933 break;
934 }
935
936 return 0;
937 }
938
939 int sas_init_queue(struct sas_ha_struct *sas_ha)
940 {
941 struct scsi_core *core = &sas_ha->core;
942
943 spin_lock_init(&core->task_queue_lock);
944 mutex_init(&core->task_queue_flush);
945 core->task_queue_size = 0;
946 INIT_LIST_HEAD(&core->task_queue);
947
948 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
949 "sas_queue_%d", core->shost->host_no);
950 if (IS_ERR(core->queue_thread))
951 return PTR_ERR(core->queue_thread);
952 return 0;
953 }
954
955 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
956 {
957 unsigned long flags;
958 struct scsi_core *core = &sas_ha->core;
959 struct sas_task *task, *n;
960
961 kthread_stop(core->queue_thread);
962
963 if (!list_empty(&core->task_queue))
964 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
965 SAS_ADDR(sas_ha->sas_addr));
966
967 spin_lock_irqsave(&core->task_queue_lock, flags);
968 list_for_each_entry_safe(task, n, &core->task_queue, list) {
969 struct scsi_cmnd *cmd = task->uldd_task;
970
971 list_del_init(&task->list);
972
973 ASSIGN_SAS_TASK(cmd, NULL);
974 sas_free_task(task);
975 cmd->result = DID_ABORT << 16;
976 cmd->scsi_done(cmd);
977 }
978 spin_unlock_irqrestore(&core->task_queue_lock, flags);
979 }
980
981 /*
982 * Tell an upper layer that it needs to initiate an abort for a given task.
983 * This should only ever be called by an LLDD.
984 */
985 void sas_task_abort(struct sas_task *task)
986 {
987 struct scsi_cmnd *sc = task->uldd_task;
988
989 /* Escape for libsas internal commands */
990 if (!sc) {
991 if (!del_timer(&task->timer))
992 return;
993 task->timer.function(task->timer.data);
994 return;
995 }
996
997 if (dev_is_sata(task->dev)) {
998 sas_ata_task_abort(task);
999 } else {
1000 struct request_queue *q = sc->device->request_queue;
1001 unsigned long flags;
1002
1003 spin_lock_irqsave(q->queue_lock, flags);
1004 blk_abort_request(sc->request);
1005 spin_unlock_irqrestore(q->queue_lock, flags);
1006 scsi_schedule_eh(sc->device->host);
1007 }
1008 }
1009
1010 void sas_target_destroy(struct scsi_target *starget)
1011 {
1012 struct domain_device *found_dev = starget->hostdata;
1013
1014 if (!found_dev)
1015 return;
1016
1017 starget->hostdata = NULL;
1018 sas_put_device(found_dev);
1019 }
1020
1021 static void sas_parse_addr(u8 *sas_addr, const char *p)
1022 {
1023 int i;
1024 for (i = 0; i < SAS_ADDR_SIZE; i++) {
1025 u8 h, l;
1026 if (!*p)
1027 break;
1028 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1029 p++;
1030 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1031 p++;
1032 sas_addr[i] = (h<<4) | l;
1033 }
1034 }
1035
1036 #define SAS_STRING_ADDR_SIZE 16
1037
1038 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1039 {
1040 int res;
1041 const struct firmware *fw;
1042
1043 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1044 if (res)
1045 return res;
1046
1047 if (fw->size < SAS_STRING_ADDR_SIZE) {
1048 res = -ENODEV;
1049 goto out;
1050 }
1051
1052 sas_parse_addr(addr, fw->data);
1053
1054 out:
1055 release_firmware(fw);
1056 return res;
1057 }
1058 EXPORT_SYMBOL_GPL(sas_request_addr);
1059
1060 EXPORT_SYMBOL_GPL(sas_queuecommand);
1061 EXPORT_SYMBOL_GPL(sas_target_alloc);
1062 EXPORT_SYMBOL_GPL(sas_slave_configure);
1063 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1064 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1065 EXPORT_SYMBOL_GPL(sas_bios_param);
1066 EXPORT_SYMBOL_GPL(sas_task_abort);
1067 EXPORT_SYMBOL_GPL(sas_phy_reset);
1068 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1069 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1070 EXPORT_SYMBOL_GPL(sas_target_destroy);
1071 EXPORT_SYMBOL_GPL(sas_ioctl);
Linux kernel - Deliverables
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