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iwlwifi: introduce host commands callbacks
[linux/fpc-iii.git] / drivers / scsi / libsas / sas_scsi_host.c
blob1f8241563c6ccea625640eb69c22554d931f3d87
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
28 #include "sas_internal.h"
29
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_eh.h>
35 #include <scsi/scsi_transport.h>
36 #include <scsi/scsi_transport_sas.h>
37 #include <scsi/sas_ata.h>
38 #include "../scsi_sas_internal.h"
39 #include "../scsi_transport_api.h"
40 #include "../scsi_priv.h"
41
42 #include <linux/err.h>
43 #include <linux/blkdev.h>
44 #include <linux/freezer.h>
45 #include <linux/scatterlist.h>
46 #include <linux/libata.h>
47
48 /* ---------- SCSI Host glue ---------- */
49
50 static void sas_scsi_task_done(struct sas_task *task)
51 {
52 struct task_status_struct *ts = &task->task_status;
53 struct scsi_cmnd *sc = task->uldd_task;
54 int hs = 0, stat = 0;
55
56 if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
57 /* Aborted tasks will be completed by the error handler */
58 SAS_DPRINTK("task done but aborted\n");
59 return;
60 }
61
62 if (unlikely(!sc)) {
63 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
64 list_del_init(&task->list);
65 sas_free_task(task);
66 return;
67 }
68
69 if (ts->resp == SAS_TASK_UNDELIVERED) {
70 /* transport error */
71 hs = DID_NO_CONNECT;
72 } else { /* ts->resp == SAS_TASK_COMPLETE */
73 /* task delivered, what happened afterwards? */
74 switch (ts->stat) {
75 case SAS_DEV_NO_RESPONSE:
76 case SAS_INTERRUPTED:
77 case SAS_PHY_DOWN:
78 case SAS_NAK_R_ERR:
79 case SAS_OPEN_TO:
80 hs = DID_NO_CONNECT;
81 break;
82 case SAS_DATA_UNDERRUN:
83 scsi_set_resid(sc, ts->residual);
84 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
85 hs = DID_ERROR;
86 break;
87 case SAS_DATA_OVERRUN:
88 hs = DID_ERROR;
89 break;
90 case SAS_QUEUE_FULL:
91 hs = DID_SOFT_ERROR; /* retry */
92 break;
93 case SAS_DEVICE_UNKNOWN:
94 hs = DID_BAD_TARGET;
95 break;
96 case SAS_SG_ERR:
97 hs = DID_PARITY;
98 break;
99 case SAS_OPEN_REJECT:
100 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
101 hs = DID_SOFT_ERROR; /* retry */
102 else
103 hs = DID_ERROR;
104 break;
105 case SAS_PROTO_RESPONSE:
106 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
107 "task; please report this\n",
108 task->dev->port->ha->sas_ha_name);
109 break;
110 case SAS_ABORTED_TASK:
111 hs = DID_ABORT;
112 break;
113 case SAM_CHECK_COND:
114 memcpy(sc->sense_buffer, ts->buf,
115 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
116 stat = SAM_CHECK_COND;
117 break;
118 default:
119 stat = ts->stat;
120 break;
121 }
122 }
123 ASSIGN_SAS_TASK(sc, NULL);
124 sc->result = (hs << 16) | stat;
125 list_del_init(&task->list);
126 sas_free_task(task);
127 sc->scsi_done(sc);
128 }
129
130 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
131 {
132 enum task_attribute ta = TASK_ATTR_SIMPLE;
133 if (cmd->request && blk_rq_tagged(cmd->request)) {
134 if (cmd->device->ordered_tags &&
135 (cmd->request->cmd_flags & REQ_HARDBARRIER))
136 ta = TASK_ATTR_ORDERED;
137 }
138 return ta;
139 }
140
141 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
142 struct domain_device *dev,
143 gfp_t gfp_flags)
144 {
145 struct sas_task *task = sas_alloc_task(gfp_flags);
146 struct scsi_lun lun;
147
148 if (!task)
149 return NULL;
150
151 task->uldd_task = cmd;
152 ASSIGN_SAS_TASK(cmd, task);
153
154 task->dev = dev;
155 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
156
157 task->ssp_task.retry_count = 1;
158 int_to_scsilun(cmd->device->lun, &lun);
159 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
160 task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
161 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
162
163 task->scatter = scsi_sglist(cmd);
164 task->num_scatter = scsi_sg_count(cmd);
165 task->total_xfer_len = scsi_bufflen(cmd);
166 task->data_dir = cmd->sc_data_direction;
167
168 task->task_done = sas_scsi_task_done;
169
170 return task;
171 }
172
173 int sas_queue_up(struct sas_task *task)
174 {
175 struct sas_ha_struct *sas_ha = task->dev->port->ha;
176 struct scsi_core *core = &sas_ha->core;
177 unsigned long flags;
178 LIST_HEAD(list);
179
180 spin_lock_irqsave(&core->task_queue_lock, flags);
181 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
182 spin_unlock_irqrestore(&core->task_queue_lock, flags);
183 return -SAS_QUEUE_FULL;
184 }
185 list_add_tail(&task->list, &core->task_queue);
186 core->task_queue_size += 1;
187 spin_unlock_irqrestore(&core->task_queue_lock, flags);
188 wake_up_process(core->queue_thread);
189
190 return 0;
191 }
192
193 /**
194 * sas_queuecommand -- Enqueue a command for processing
195 * @parameters: See SCSI Core documentation
196 *
197 * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
198 * call us without holding an IRQ spinlock...
199 */
200 int sas_queuecommand(struct scsi_cmnd *cmd,
201 void (*scsi_done)(struct scsi_cmnd *))
202 __releases(host->host_lock)
203 __acquires(dev->sata_dev.ap->lock)
204 __releases(dev->sata_dev.ap->lock)
205 __acquires(host->host_lock)
206 {
207 int res = 0;
208 struct domain_device *dev = cmd_to_domain_dev(cmd);
209 struct Scsi_Host *host = cmd->device->host;
210 struct sas_internal *i = to_sas_internal(host->transportt);
211
212 spin_unlock_irq(host->host_lock);
213
214 {
215 struct sas_ha_struct *sas_ha = dev->port->ha;
216 struct sas_task *task;
217
218 if (dev_is_sata(dev)) {
219 unsigned long flags;
220
221 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
222 res = ata_sas_queuecmd(cmd, scsi_done,
223 dev->sata_dev.ap);
224 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
225 goto out;
226 }
227
228 res = -ENOMEM;
229 task = sas_create_task(cmd, dev, GFP_ATOMIC);
230 if (!task)
231 goto out;
232
233 cmd->scsi_done = scsi_done;
234 /* Queue up, Direct Mode or Task Collector Mode. */
235 if (sas_ha->lldd_max_execute_num < 2)
236 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
237 else
238 res = sas_queue_up(task);
239
240 /* Examine */
241 if (res) {
242 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
243 ASSIGN_SAS_TASK(cmd, NULL);
244 sas_free_task(task);
245 if (res == -SAS_QUEUE_FULL) {
246 cmd->result = DID_SOFT_ERROR << 16; /* retry */
247 res = 0;
248 scsi_done(cmd);
249 }
250 goto out;
251 }
252 }
253 out:
254 spin_lock_irq(host->host_lock);
255 return res;
256 }
257
258 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
259 {
260 struct sas_task *task = TO_SAS_TASK(cmd);
261 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
262
263 /* remove the aborted task flag to allow the task to be
264 * completed now. At this point, we only get called following
265 * an actual abort of the task, so we should be guaranteed not
266 * to be racing with any completions from the LLD (hence we
267 * don't need the task state lock to clear the flag) */
268 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
269 /* Now call task_done. However, task will be free'd after
270 * this */
271 task->task_done(task);
272 /* now finish the command and move it on to the error
273 * handler done list, this also takes it off the
274 * error handler pending list */
275 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
276 }
277
278 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
279 {
280 struct scsi_cmnd *cmd, *n;
281
282 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
283 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
284 cmd->device->lun == my_cmd->device->lun)
285 sas_eh_finish_cmd(cmd);
286 }
287 }
288
289 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
290 struct domain_device *dev)
291 {
292 struct scsi_cmnd *cmd, *n;
293
294 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
295 struct domain_device *x = cmd_to_domain_dev(cmd);
296
297 if (x == dev)
298 sas_eh_finish_cmd(cmd);
299 }
300 }
301
302 static void sas_scsi_clear_queue_port(struct list_head *error_q,
303 struct asd_sas_port *port)
304 {
305 struct scsi_cmnd *cmd, *n;
306
307 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
308 struct domain_device *dev = cmd_to_domain_dev(cmd);
309 struct asd_sas_port *x = dev->port;
310
311 if (x == port)
312 sas_eh_finish_cmd(cmd);
313 }
314 }
315
316 enum task_disposition {
317 TASK_IS_DONE,
318 TASK_IS_ABORTED,
319 TASK_IS_AT_LU,
320 TASK_IS_NOT_AT_LU,
321 TASK_ABORT_FAILED,
322 };
323
324 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
325 {
326 struct sas_ha_struct *ha = task->dev->port->ha;
327 unsigned long flags;
328 int i, res;
329 struct sas_internal *si =
330 to_sas_internal(task->dev->port->ha->core.shost->transportt);
331
332 if (ha->lldd_max_execute_num > 1) {
333 struct scsi_core *core = &ha->core;
334 struct sas_task *t, *n;
335
336 spin_lock_irqsave(&core->task_queue_lock, flags);
337 list_for_each_entry_safe(t, n, &core->task_queue, list) {
338 if (task == t) {
339 list_del_init(&t->list);
340 spin_unlock_irqrestore(&core->task_queue_lock,
341 flags);
342 SAS_DPRINTK("%s: task 0x%p aborted from "
343 "task_queue\n",
344 __FUNCTION__, task);
345 return TASK_IS_ABORTED;
346 }
347 }
348 spin_unlock_irqrestore(&core->task_queue_lock, flags);
349 }
350
351 for (i = 0; i < 5; i++) {
352 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
353 res = si->dft->lldd_abort_task(task);
354
355 spin_lock_irqsave(&task->task_state_lock, flags);
356 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
357 spin_unlock_irqrestore(&task->task_state_lock, flags);
358 SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
359 task);
360 return TASK_IS_DONE;
361 }
362 spin_unlock_irqrestore(&task->task_state_lock, flags);
363
364 if (res == TMF_RESP_FUNC_COMPLETE) {
365 SAS_DPRINTK("%s: task 0x%p is aborted\n",
366 __FUNCTION__, task);
367 return TASK_IS_ABORTED;
368 } else if (si->dft->lldd_query_task) {
369 SAS_DPRINTK("%s: querying task 0x%p\n",
370 __FUNCTION__, task);
371 res = si->dft->lldd_query_task(task);
372 switch (res) {
373 case TMF_RESP_FUNC_SUCC:
374 SAS_DPRINTK("%s: task 0x%p at LU\n",
375 __FUNCTION__, task);
376 return TASK_IS_AT_LU;
377 case TMF_RESP_FUNC_COMPLETE:
378 SAS_DPRINTK("%s: task 0x%p not at LU\n",
379 __FUNCTION__, task);
380 return TASK_IS_NOT_AT_LU;
381 case TMF_RESP_FUNC_FAILED:
382 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
383 __FUNCTION__, task);
384 return TASK_ABORT_FAILED;
385 }
386
387 }
388 }
389 return res;
390 }
391
392 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
393 {
394 int res = TMF_RESP_FUNC_FAILED;
395 struct scsi_lun lun;
396 struct sas_internal *i =
397 to_sas_internal(dev->port->ha->core.shost->transportt);
398
399 int_to_scsilun(cmd->device->lun, &lun);
400
401 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
402 SAS_ADDR(dev->sas_addr),
403 cmd->device->lun);
404
405 if (i->dft->lldd_abort_task_set)
406 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
407
408 if (res == TMF_RESP_FUNC_FAILED) {
409 if (i->dft->lldd_clear_task_set)
410 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
411 }
412
413 if (res == TMF_RESP_FUNC_FAILED) {
414 if (i->dft->lldd_lu_reset)
415 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
416 }
417
418 return res;
419 }
420
421 static int sas_recover_I_T(struct domain_device *dev)
422 {
423 int res = TMF_RESP_FUNC_FAILED;
424 struct sas_internal *i =
425 to_sas_internal(dev->port->ha->core.shost->transportt);
426
427 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
428 SAS_ADDR(dev->sas_addr));
429
430 if (i->dft->lldd_I_T_nexus_reset)
431 res = i->dft->lldd_I_T_nexus_reset(dev);
432
433 return res;
434 }
435
436 /* Find the sas_phy that's attached to this device */
437 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
438 {
439 struct domain_device *pdev = dev->parent;
440 struct ex_phy *exphy = NULL;
441 int i;
442
443 /* Directly attached device */
444 if (!pdev)
445 return dev->port->phy;
446
447 /* Otherwise look in the expander */
448 for (i = 0; i < pdev->ex_dev.num_phys; i++)
449 if (!memcmp(dev->sas_addr,
450 pdev->ex_dev.ex_phy[i].attached_sas_addr,
451 SAS_ADDR_SIZE)) {
452 exphy = &pdev->ex_dev.ex_phy[i];
453 break;
454 }
455
456 BUG_ON(!exphy);
457 return exphy->phy;
458 }
459 EXPORT_SYMBOL_GPL(sas_find_local_phy);
460
461 /* Attempt to send a LUN reset message to a device */
462 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
463 {
464 struct domain_device *dev = cmd_to_domain_dev(cmd);
465 struct sas_internal *i =
466 to_sas_internal(dev->port->ha->core.shost->transportt);
467 struct scsi_lun lun;
468 int res;
469
470 int_to_scsilun(cmd->device->lun, &lun);
471
472 if (!i->dft->lldd_lu_reset)
473 return FAILED;
474
475 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
476 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
477 return SUCCESS;
478
479 return FAILED;
480 }
481
482 /* Attempt to send a phy (bus) reset */
483 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
484 {
485 struct domain_device *dev = cmd_to_domain_dev(cmd);
486 struct sas_phy *phy = sas_find_local_phy(dev);
487 int res;
488
489 res = sas_phy_reset(phy, 1);
490 if (res)
491 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
492 kobject_name(&phy->dev.kobj),
493 res);
494 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
495 return SUCCESS;
496
497 return FAILED;
498 }
499
500 /* Try to reset a device */
501 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
502 {
503 int res;
504 struct Scsi_Host *shost = cmd->device->host;
505
506 if (!shost->hostt->eh_device_reset_handler)
507 goto try_bus_reset;
508
509 res = shost->hostt->eh_device_reset_handler(cmd);
510 if (res == SUCCESS)
511 return res;
512
513 try_bus_reset:
514 if (shost->hostt->eh_bus_reset_handler)
515 return shost->hostt->eh_bus_reset_handler(cmd);
516
517 return FAILED;
518 }
519
520 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
521 struct list_head *work_q,
522 struct list_head *done_q)
523 {
524 struct scsi_cmnd *cmd, *n;
525 enum task_disposition res = TASK_IS_DONE;
526 int tmf_resp, need_reset;
527 struct sas_internal *i = to_sas_internal(shost->transportt);
528 unsigned long flags;
529 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
530
531 Again:
532 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
533 struct sas_task *task = TO_SAS_TASK(cmd);
534
535 if (!task)
536 continue;
537
538 list_del_init(&cmd->eh_entry);
539
540 spin_lock_irqsave(&task->task_state_lock, flags);
541 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
542 spin_unlock_irqrestore(&task->task_state_lock, flags);
543
544 if (need_reset) {
545 SAS_DPRINTK("%s: task 0x%p requests reset\n",
546 __FUNCTION__, task);
547 goto reset;
548 }
549
550 SAS_DPRINTK("trying to find task 0x%p\n", task);
551 res = sas_scsi_find_task(task);
552
553 cmd->eh_eflags = 0;
554
555 switch (res) {
556 case TASK_IS_DONE:
557 SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
558 task);
559 sas_eh_finish_cmd(cmd);
560 continue;
561 case TASK_IS_ABORTED:
562 SAS_DPRINTK("%s: task 0x%p is aborted\n",
563 __FUNCTION__, task);
564 sas_eh_finish_cmd(cmd);
565 continue;
566 case TASK_IS_AT_LU:
567 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
568 reset:
569 tmf_resp = sas_recover_lu(task->dev, cmd);
570 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
571 SAS_DPRINTK("dev %016llx LU %x is "
572 "recovered\n",
573 SAS_ADDR(task->dev),
574 cmd->device->lun);
575 sas_eh_finish_cmd(cmd);
576 sas_scsi_clear_queue_lu(work_q, cmd);
577 goto Again;
578 }
579 /* fallthrough */
580 case TASK_IS_NOT_AT_LU:
581 case TASK_ABORT_FAILED:
582 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
583 task);
584 tmf_resp = sas_recover_I_T(task->dev);
585 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
586 struct domain_device *dev = task->dev;
587 SAS_DPRINTK("I_T %016llx recovered\n",
588 SAS_ADDR(task->dev->sas_addr));
589 sas_eh_finish_cmd(cmd);
590 sas_scsi_clear_queue_I_T(work_q, dev);
591 goto Again;
592 }
593 /* Hammer time :-) */
594 try_to_reset_cmd_device(cmd);
595 if (i->dft->lldd_clear_nexus_port) {
596 struct asd_sas_port *port = task->dev->port;
597 SAS_DPRINTK("clearing nexus for port:%d\n",
598 port->id);
599 res = i->dft->lldd_clear_nexus_port(port);
600 if (res == TMF_RESP_FUNC_COMPLETE) {
601 SAS_DPRINTK("clear nexus port:%d "
602 "succeeded\n", port->id);
603 sas_eh_finish_cmd(cmd);
604 sas_scsi_clear_queue_port(work_q,
605 port);
606 goto Again;
607 }
608 }
609 if (i->dft->lldd_clear_nexus_ha) {
610 SAS_DPRINTK("clear nexus ha\n");
611 res = i->dft->lldd_clear_nexus_ha(ha);
612 if (res == TMF_RESP_FUNC_COMPLETE) {
613 SAS_DPRINTK("clear nexus ha "
614 "succeeded\n");
615 sas_eh_finish_cmd(cmd);
616 goto clear_q;
617 }
618 }
619 /* If we are here -- this means that no amount
620 * of effort could recover from errors. Quite
621 * possibly the HA just disappeared.
622 */
623 SAS_DPRINTK("error from device %llx, LUN %x "
624 "couldn't be recovered in any way\n",
625 SAS_ADDR(task->dev->sas_addr),
626 cmd->device->lun);
627
628 sas_eh_finish_cmd(cmd);
629 goto clear_q;
630 }
631 }
632 return list_empty(work_q);
633 clear_q:
634 SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
635 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
636 sas_eh_finish_cmd(cmd);
637
638 return list_empty(work_q);
639 }
640
641 void sas_scsi_recover_host(struct Scsi_Host *shost)
642 {
643 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
644 unsigned long flags;
645 LIST_HEAD(eh_work_q);
646
647 spin_lock_irqsave(shost->host_lock, flags);
648 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
649 spin_unlock_irqrestore(shost->host_lock, flags);
650
651 SAS_DPRINTK("Enter %s\n", __FUNCTION__);
652 /*
653 * Deal with commands that still have SAS tasks (i.e. they didn't
654 * complete via the normal sas_task completion mechanism)
655 */
656 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
657 goto out;
658
659 /*
660 * Now deal with SCSI commands that completed ok but have a an error
661 * code (and hopefully sense data) attached. This is roughly what
662 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
663 * command we see here has no sas_task and is thus unknown to the HA.
664 */
665 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
666 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
667
668 out:
669 scsi_eh_flush_done_q(&ha->eh_done_q);
670 SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
671 return;
672 }
673
674 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
675 {
676 struct sas_task *task = TO_SAS_TASK(cmd);
677 unsigned long flags;
678
679 if (!task) {
680 cmd->timeout_per_command /= 2;
681 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
682 cmd, task, (cmd->timeout_per_command ?
683 "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
684 if (!cmd->timeout_per_command)
685 return EH_NOT_HANDLED;
686 return EH_RESET_TIMER;
687 }
688
689 spin_lock_irqsave(&task->task_state_lock, flags);
690 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
691 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
692 spin_unlock_irqrestore(&task->task_state_lock, flags);
693 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
694 cmd, task);
695 return EH_HANDLED;
696 }
697 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
698 spin_unlock_irqrestore(&task->task_state_lock, flags);
699 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
700 "EH_RESET_TIMER\n",
701 cmd, task);
702 return EH_RESET_TIMER;
703 }
704 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
705 spin_unlock_irqrestore(&task->task_state_lock, flags);
706
707 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
708 cmd, task);
709
710 return EH_NOT_HANDLED;
711 }
712
713 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
714 {
715 struct domain_device *dev = sdev_to_domain_dev(sdev);
716
717 if (dev_is_sata(dev))
718 return ata_scsi_ioctl(sdev, cmd, arg);
719
720 return -EINVAL;
721 }
722
723 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
724 {
725 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
726 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
727 struct domain_device *found_dev = NULL;
728 int i;
729 unsigned long flags;
730
731 spin_lock_irqsave(&ha->phy_port_lock, flags);
732 for (i = 0; i < ha->num_phys; i++) {
733 struct asd_sas_port *port = ha->sas_port[i];
734 struct domain_device *dev;
735
736 spin_lock(&port->dev_list_lock);
737 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
738 if (rphy == dev->rphy) {
739 found_dev = dev;
740 spin_unlock(&port->dev_list_lock);
741 goto found;
742 }
743 }
744 spin_unlock(&port->dev_list_lock);
745 }
746 found:
747 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
748
749 return found_dev;
750 }
751
752 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
753 {
754 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
755
756 return sas_find_dev_by_rphy(rphy);
757 }
758
759 int sas_target_alloc(struct scsi_target *starget)
760 {
761 struct domain_device *found_dev = sas_find_target(starget);
762 int res;
763
764 if (!found_dev)
765 return -ENODEV;
766
767 if (dev_is_sata(found_dev)) {
768 res = sas_ata_init_host_and_port(found_dev, starget);
769 if (res)
770 return res;
771 }
772
773 starget->hostdata = found_dev;
774 return 0;
775 }
776
777 #define SAS_DEF_QD 32
778 #define SAS_MAX_QD 64
779
780 int sas_slave_configure(struct scsi_device *scsi_dev)
781 {
782 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
783 struct sas_ha_struct *sas_ha;
784
785 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
786
787 if (dev_is_sata(dev)) {
788 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
789 return 0;
790 }
791
792 sas_ha = dev->port->ha;
793
794 sas_read_port_mode_page(scsi_dev);
795
796 if (scsi_dev->tagged_supported) {
797 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
798 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
799 } else {
800 SAS_DPRINTK("device %llx, LUN %x doesn't support "
801 "TCQ\n", SAS_ADDR(dev->sas_addr),
802 scsi_dev->lun);
803 scsi_dev->tagged_supported = 0;
804 scsi_set_tag_type(scsi_dev, 0);
805 scsi_deactivate_tcq(scsi_dev, 1);
806 }
807
808 scsi_dev->allow_restart = 1;
809
810 return 0;
811 }
812
813 void sas_slave_destroy(struct scsi_device *scsi_dev)
814 {
815 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
816
817 if (dev_is_sata(dev))
818 ata_port_disable(dev->sata_dev.ap);
819 }
820
821 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
822 {
823 int res = min(new_depth, SAS_MAX_QD);
824
825 if (scsi_dev->tagged_supported)
826 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
827 res);
828 else {
829 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
830 sas_printk("device %llx LUN %x queue depth changed to 1\n",
831 SAS_ADDR(dev->sas_addr),
832 scsi_dev->lun);
833 scsi_adjust_queue_depth(scsi_dev, 0, 1);
834 res = 1;
835 }
836
837 return res;
838 }
839
840 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
841 {
842 if (!scsi_dev->tagged_supported)
843 return 0;
844
845 scsi_deactivate_tcq(scsi_dev, 1);
846
847 scsi_set_tag_type(scsi_dev, qt);
848 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
849
850 return qt;
851 }
852
853 int sas_bios_param(struct scsi_device *scsi_dev,
854 struct block_device *bdev,
855 sector_t capacity, int *hsc)
856 {
857 hsc[0] = 255;
858 hsc[1] = 63;
859 sector_div(capacity, 255*63);
860 hsc[2] = capacity;
861
862 return 0;
863 }
864
865 /* ---------- Task Collector Thread implementation ---------- */
866
867 static void sas_queue(struct sas_ha_struct *sas_ha)
868 {
869 struct scsi_core *core = &sas_ha->core;
870 unsigned long flags;
871 LIST_HEAD(q);
872 int can_queue;
873 int res;
874 struct sas_internal *i = to_sas_internal(core->shost->transportt);
875
876 spin_lock_irqsave(&core->task_queue_lock, flags);
877 while (!kthread_should_stop() &&
878 !list_empty(&core->task_queue)) {
879
880 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
881 if (can_queue >= 0) {
882 can_queue = core->task_queue_size;
883 list_splice_init(&core->task_queue, &q);
884 } else {
885 struct list_head *a, *n;
886
887 can_queue = sas_ha->lldd_queue_size;
888 list_for_each_safe(a, n, &core->task_queue) {
889 list_move_tail(a, &q);
890 if (--can_queue == 0)
891 break;
892 }
893 can_queue = sas_ha->lldd_queue_size;
894 }
895 core->task_queue_size -= can_queue;
896 spin_unlock_irqrestore(&core->task_queue_lock, flags);
897 {
898 struct sas_task *task = list_entry(q.next,
899 struct sas_task,
900 list);
901 list_del_init(&q);
902 res = i->dft->lldd_execute_task(task, can_queue,
903 GFP_KERNEL);
904 if (unlikely(res))
905 __list_add(&q, task->list.prev, &task->list);
906 }
907 spin_lock_irqsave(&core->task_queue_lock, flags);
908 if (res) {
909 list_splice_init(&q, &core->task_queue); /*at head*/
910 core->task_queue_size += can_queue;
911 }
912 }
913 spin_unlock_irqrestore(&core->task_queue_lock, flags);
914 }
915
916 /**
917 * sas_queue_thread -- The Task Collector thread
918 * @_sas_ha: pointer to struct sas_ha
919 */
920 static int sas_queue_thread(void *_sas_ha)
921 {
922 struct sas_ha_struct *sas_ha = _sas_ha;
923
924 while (1) {
925 set_current_state(TASK_INTERRUPTIBLE);
926 schedule();
927 sas_queue(sas_ha);
928 if (kthread_should_stop())
929 break;
930 }
931
932 return 0;
933 }
934
935 int sas_init_queue(struct sas_ha_struct *sas_ha)
936 {
937 struct scsi_core *core = &sas_ha->core;
938
939 spin_lock_init(&core->task_queue_lock);
940 core->task_queue_size = 0;
941 INIT_LIST_HEAD(&core->task_queue);
942
943 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
944 "sas_queue_%d", core->shost->host_no);
945 if (IS_ERR(core->queue_thread))
946 return PTR_ERR(core->queue_thread);
947 return 0;
948 }
949
950 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
951 {
952 unsigned long flags;
953 struct scsi_core *core = &sas_ha->core;
954 struct sas_task *task, *n;
955
956 kthread_stop(core->queue_thread);
957
958 if (!list_empty(&core->task_queue))
959 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
960 SAS_ADDR(sas_ha->sas_addr));
961
962 spin_lock_irqsave(&core->task_queue_lock, flags);
963 list_for_each_entry_safe(task, n, &core->task_queue, list) {
964 struct scsi_cmnd *cmd = task->uldd_task;
965
966 list_del_init(&task->list);
967
968 ASSIGN_SAS_TASK(cmd, NULL);
969 sas_free_task(task);
970 cmd->result = DID_ABORT << 16;
971 cmd->scsi_done(cmd);
972 }
973 spin_unlock_irqrestore(&core->task_queue_lock, flags);
974 }
975
976 /*
977 * Call the LLDD task abort routine directly. This function is intended for
978 * use by upper layers that need to tell the LLDD to abort a task.
979 */
980 int __sas_task_abort(struct sas_task *task)
981 {
982 struct sas_internal *si =
983 to_sas_internal(task->dev->port->ha->core.shost->transportt);
984 unsigned long flags;
985 int res;
986
987 spin_lock_irqsave(&task->task_state_lock, flags);
988 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
989 task->task_state_flags & SAS_TASK_STATE_DONE) {
990 spin_unlock_irqrestore(&task->task_state_lock, flags);
991 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
992 task);
993 return 0;
994 }
995 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
996 spin_unlock_irqrestore(&task->task_state_lock, flags);
997
998 if (!si->dft->lldd_abort_task)
999 return -ENODEV;
1000
1001 res = si->dft->lldd_abort_task(task);
1002
1003 spin_lock_irqsave(&task->task_state_lock, flags);
1004 if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1005 (res == TMF_RESP_FUNC_COMPLETE))
1006 {
1007 spin_unlock_irqrestore(&task->task_state_lock, flags);
1008 task->task_done(task);
1009 return 0;
1010 }
1011
1012 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1013 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1014 spin_unlock_irqrestore(&task->task_state_lock, flags);
1015
1016 return -EAGAIN;
1017 }
1018
1019 /*
1020 * Tell an upper layer that it needs to initiate an abort for a given task.
1021 * This should only ever be called by an LLDD.
1022 */
1023 void sas_task_abort(struct sas_task *task)
1024 {
1025 struct scsi_cmnd *sc = task->uldd_task;
1026
1027 /* Escape for libsas internal commands */
1028 if (!sc) {
1029 if (!del_timer(&task->timer))
1030 return;
1031 task->timer.function(task->timer.data);
1032 return;
1033 }
1034
1035 if (dev_is_sata(task->dev)) {
1036 sas_ata_task_abort(task);
1037 return;
1038 }
1039
1040 scsi_req_abort_cmd(sc);
1041 scsi_schedule_eh(sc->device->host);
1042 }
1043
1044 int sas_slave_alloc(struct scsi_device *scsi_dev)
1045 {
1046 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1047
1048 if (dev_is_sata(dev))
1049 return ata_sas_port_init(dev->sata_dev.ap);
1050
1051 return 0;
1052 }
1053
1054 void sas_target_destroy(struct scsi_target *starget)
1055 {
1056 struct domain_device *found_dev = sas_find_target(starget);
1057
1058 if (!found_dev)
1059 return;
1060
1061 if (dev_is_sata(found_dev))
1062 ata_sas_port_destroy(found_dev->sata_dev.ap);
1063
1064 return;
1065 }
1066
1067 EXPORT_SYMBOL_GPL(sas_queuecommand);
1068 EXPORT_SYMBOL_GPL(sas_target_alloc);
1069 EXPORT_SYMBOL_GPL(sas_slave_configure);
1070 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1071 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1072 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1073 EXPORT_SYMBOL_GPL(sas_bios_param);
1074 EXPORT_SYMBOL_GPL(__sas_task_abort);
1075 EXPORT_SYMBOL_GPL(sas_task_abort);
1076 EXPORT_SYMBOL_GPL(sas_phy_reset);
1077 EXPORT_SYMBOL_GPL(sas_phy_enable);
1078 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1079 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1080 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1081 EXPORT_SYMBOL_GPL(sas_target_destroy);
1082 EXPORT_SYMBOL_GPL(sas_ioctl);
Linux with added FPC-III support