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x86: cpa self-test, WARN_ON()
[wrt350n-kernel.git] / drivers / scsi / libsas / sas_scsi_host.c
blobf869fba8680721ed8365c0fed872fd4915ed7a84
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 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
55 unsigned ts_flags = task->task_state_flags;
56 int hs = 0, stat = 0;
57
58 if (unlikely(!sc)) {
59 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
60 list_del_init(&task->list);
61 sas_free_task(task);
62 return;
63 }
64
65 if (ts->resp == SAS_TASK_UNDELIVERED) {
66 /* transport error */
67 hs = DID_NO_CONNECT;
68 } else { /* ts->resp == SAS_TASK_COMPLETE */
69 /* task delivered, what happened afterwards? */
70 switch (ts->stat) {
71 case SAS_DEV_NO_RESPONSE:
72 case SAS_INTERRUPTED:
73 case SAS_PHY_DOWN:
74 case SAS_NAK_R_ERR:
75 case SAS_OPEN_TO:
76 hs = DID_NO_CONNECT;
77 break;
78 case SAS_DATA_UNDERRUN:
79 scsi_set_resid(sc, ts->residual);
80 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
81 hs = DID_ERROR;
82 break;
83 case SAS_DATA_OVERRUN:
84 hs = DID_ERROR;
85 break;
86 case SAS_QUEUE_FULL:
87 hs = DID_SOFT_ERROR; /* retry */
88 break;
89 case SAS_DEVICE_UNKNOWN:
90 hs = DID_BAD_TARGET;
91 break;
92 case SAS_SG_ERR:
93 hs = DID_PARITY;
94 break;
95 case SAS_OPEN_REJECT:
96 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
97 hs = DID_SOFT_ERROR; /* retry */
98 else
99 hs = DID_ERROR;
100 break;
101 case SAS_PROTO_RESPONSE:
102 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
103 "task; please report this\n",
104 task->dev->port->ha->sas_ha_name);
105 break;
106 case SAS_ABORTED_TASK:
107 hs = DID_ABORT;
108 break;
109 case SAM_CHECK_COND:
110 memcpy(sc->sense_buffer, ts->buf,
111 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
112 stat = SAM_CHECK_COND;
113 break;
114 default:
115 stat = ts->stat;
116 break;
117 }
118 }
119 ASSIGN_SAS_TASK(sc, NULL);
120 sc->result = (hs << 16) | stat;
121 list_del_init(&task->list);
122 sas_free_task(task);
123 /* This is very ugly but this is how SCSI Core works. */
124 if (ts_flags & SAS_TASK_STATE_ABORTED)
125 scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
126 else
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_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
259 {
260 struct scsi_cmnd *cmd, *n;
261
262 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
263 if (cmd == my_cmd)
264 list_del_init(&cmd->eh_entry);
265 }
266 }
267
268 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
269 struct domain_device *dev)
270 {
271 struct scsi_cmnd *cmd, *n;
272
273 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
274 struct domain_device *x = cmd_to_domain_dev(cmd);
275
276 if (x == dev)
277 list_del_init(&cmd->eh_entry);
278 }
279 }
280
281 static void sas_scsi_clear_queue_port(struct list_head *error_q,
282 struct asd_sas_port *port)
283 {
284 struct scsi_cmnd *cmd, *n;
285
286 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
287 struct domain_device *dev = cmd_to_domain_dev(cmd);
288 struct asd_sas_port *x = dev->port;
289
290 if (x == port)
291 list_del_init(&cmd->eh_entry);
292 }
293 }
294
295 enum task_disposition {
296 TASK_IS_DONE,
297 TASK_IS_ABORTED,
298 TASK_IS_AT_LU,
299 TASK_IS_NOT_AT_LU,
300 TASK_ABORT_FAILED,
301 };
302
303 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
304 {
305 struct sas_ha_struct *ha = task->dev->port->ha;
306 unsigned long flags;
307 int i, res;
308 struct sas_internal *si =
309 to_sas_internal(task->dev->port->ha->core.shost->transportt);
310
311 if (ha->lldd_max_execute_num > 1) {
312 struct scsi_core *core = &ha->core;
313 struct sas_task *t, *n;
314
315 spin_lock_irqsave(&core->task_queue_lock, flags);
316 list_for_each_entry_safe(t, n, &core->task_queue, list) {
317 if (task == t) {
318 list_del_init(&t->list);
319 spin_unlock_irqrestore(&core->task_queue_lock,
320 flags);
321 SAS_DPRINTK("%s: task 0x%p aborted from "
322 "task_queue\n",
323 __FUNCTION__, task);
324 return TASK_IS_ABORTED;
325 }
326 }
327 spin_unlock_irqrestore(&core->task_queue_lock, flags);
328 }
329
330 for (i = 0; i < 5; i++) {
331 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
332 res = si->dft->lldd_abort_task(task);
333
334 spin_lock_irqsave(&task->task_state_lock, flags);
335 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
336 spin_unlock_irqrestore(&task->task_state_lock, flags);
337 SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
338 task);
339 return TASK_IS_DONE;
340 }
341 spin_unlock_irqrestore(&task->task_state_lock, flags);
342
343 if (res == TMF_RESP_FUNC_COMPLETE) {
344 SAS_DPRINTK("%s: task 0x%p is aborted\n",
345 __FUNCTION__, task);
346 return TASK_IS_ABORTED;
347 } else if (si->dft->lldd_query_task) {
348 SAS_DPRINTK("%s: querying task 0x%p\n",
349 __FUNCTION__, task);
350 res = si->dft->lldd_query_task(task);
351 switch (res) {
352 case TMF_RESP_FUNC_SUCC:
353 SAS_DPRINTK("%s: task 0x%p at LU\n",
354 __FUNCTION__, task);
355 return TASK_IS_AT_LU;
356 case TMF_RESP_FUNC_COMPLETE:
357 SAS_DPRINTK("%s: task 0x%p not at LU\n",
358 __FUNCTION__, task);
359 return TASK_IS_NOT_AT_LU;
360 case TMF_RESP_FUNC_FAILED:
361 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
362 __FUNCTION__, task);
363 return TASK_ABORT_FAILED;
364 }
365
366 }
367 }
368 return res;
369 }
370
371 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
372 {
373 int res = TMF_RESP_FUNC_FAILED;
374 struct scsi_lun lun;
375 struct sas_internal *i =
376 to_sas_internal(dev->port->ha->core.shost->transportt);
377
378 int_to_scsilun(cmd->device->lun, &lun);
379
380 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
381 SAS_ADDR(dev->sas_addr),
382 cmd->device->lun);
383
384 if (i->dft->lldd_abort_task_set)
385 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
386
387 if (res == TMF_RESP_FUNC_FAILED) {
388 if (i->dft->lldd_clear_task_set)
389 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
390 }
391
392 if (res == TMF_RESP_FUNC_FAILED) {
393 if (i->dft->lldd_lu_reset)
394 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
395 }
396
397 return res;
398 }
399
400 static int sas_recover_I_T(struct domain_device *dev)
401 {
402 int res = TMF_RESP_FUNC_FAILED;
403 struct sas_internal *i =
404 to_sas_internal(dev->port->ha->core.shost->transportt);
405
406 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
407 SAS_ADDR(dev->sas_addr));
408
409 if (i->dft->lldd_I_T_nexus_reset)
410 res = i->dft->lldd_I_T_nexus_reset(dev);
411
412 return res;
413 }
414
415 /* Find the sas_phy that's attached to this device */
416 static struct sas_phy *find_local_sas_phy(struct domain_device *dev)
417 {
418 struct domain_device *pdev = dev->parent;
419 struct ex_phy *exphy = NULL;
420 int i;
421
422 /* Directly attached device */
423 if (!pdev)
424 return dev->port->phy;
425
426 /* Otherwise look in the expander */
427 for (i = 0; i < pdev->ex_dev.num_phys; i++)
428 if (!memcmp(dev->sas_addr,
429 pdev->ex_dev.ex_phy[i].attached_sas_addr,
430 SAS_ADDR_SIZE)) {
431 exphy = &pdev->ex_dev.ex_phy[i];
432 break;
433 }
434
435 BUG_ON(!exphy);
436 return exphy->phy;
437 }
438
439 /* Attempt to send a LUN reset message to a device */
440 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
441 {
442 struct domain_device *dev = cmd_to_domain_dev(cmd);
443 struct sas_internal *i =
444 to_sas_internal(dev->port->ha->core.shost->transportt);
445 struct scsi_lun lun;
446 int res;
447
448 int_to_scsilun(cmd->device->lun, &lun);
449
450 if (!i->dft->lldd_lu_reset)
451 return FAILED;
452
453 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
454 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
455 return SUCCESS;
456
457 return FAILED;
458 }
459
460 /* Attempt to send a phy (bus) reset */
461 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
462 {
463 struct domain_device *dev = cmd_to_domain_dev(cmd);
464 struct sas_phy *phy = find_local_sas_phy(dev);
465 int res;
466
467 res = sas_phy_reset(phy, 1);
468 if (res)
469 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
470 kobject_name(&phy->dev.kobj),
471 res);
472 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
473 return SUCCESS;
474
475 return FAILED;
476 }
477
478 /* Try to reset a device */
479 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
480 struct scsi_cmnd *cmd)
481 {
482 int res;
483
484 if (!shost->hostt->eh_device_reset_handler)
485 goto try_bus_reset;
486
487 res = shost->hostt->eh_device_reset_handler(cmd);
488 if (res == SUCCESS)
489 return res;
490
491 try_bus_reset:
492 if (shost->hostt->eh_bus_reset_handler)
493 return shost->hostt->eh_bus_reset_handler(cmd);
494
495 return FAILED;
496 }
497
498 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
499 struct list_head *work_q,
500 struct list_head *done_q)
501 {
502 struct scsi_cmnd *cmd, *n;
503 enum task_disposition res = TASK_IS_DONE;
504 int tmf_resp, need_reset;
505 struct sas_internal *i = to_sas_internal(shost->transportt);
506 unsigned long flags;
507 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
508
509 Again:
510 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
511 struct sas_task *task = TO_SAS_TASK(cmd);
512
513 if (!task)
514 continue;
515
516 list_del_init(&cmd->eh_entry);
517
518 spin_lock_irqsave(&task->task_state_lock, flags);
519 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
520 spin_unlock_irqrestore(&task->task_state_lock, flags);
521
522 SAS_DPRINTK("trying to find task 0x%p\n", task);
523 res = sas_scsi_find_task(task);
524
525 cmd->eh_eflags = 0;
526
527 switch (res) {
528 case TASK_IS_DONE:
529 SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
530 task);
531 task->task_done(task);
532 if (need_reset)
533 try_to_reset_cmd_device(shost, cmd);
534 continue;
535 case TASK_IS_ABORTED:
536 SAS_DPRINTK("%s: task 0x%p is aborted\n",
537 __FUNCTION__, task);
538 task->task_done(task);
539 if (need_reset)
540 try_to_reset_cmd_device(shost, cmd);
541 continue;
542 case TASK_IS_AT_LU:
543 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
544 tmf_resp = sas_recover_lu(task->dev, cmd);
545 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
546 SAS_DPRINTK("dev %016llx LU %x is "
547 "recovered\n",
548 SAS_ADDR(task->dev),
549 cmd->device->lun);
550 task->task_done(task);
551 if (need_reset)
552 try_to_reset_cmd_device(shost, cmd);
553 sas_scsi_clear_queue_lu(work_q, cmd);
554 goto Again;
555 }
556 /* fallthrough */
557 case TASK_IS_NOT_AT_LU:
558 case TASK_ABORT_FAILED:
559 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
560 task);
561 tmf_resp = sas_recover_I_T(task->dev);
562 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
563 SAS_DPRINTK("I_T %016llx recovered\n",
564 SAS_ADDR(task->dev->sas_addr));
565 task->task_done(task);
566 if (need_reset)
567 try_to_reset_cmd_device(shost, cmd);
568 sas_scsi_clear_queue_I_T(work_q, task->dev);
569 goto Again;
570 }
571 /* Hammer time :-) */
572 if (i->dft->lldd_clear_nexus_port) {
573 struct asd_sas_port *port = task->dev->port;
574 SAS_DPRINTK("clearing nexus for port:%d\n",
575 port->id);
576 res = i->dft->lldd_clear_nexus_port(port);
577 if (res == TMF_RESP_FUNC_COMPLETE) {
578 SAS_DPRINTK("clear nexus port:%d "
579 "succeeded\n", port->id);
580 task->task_done(task);
581 if (need_reset)
582 try_to_reset_cmd_device(shost, cmd);
583 sas_scsi_clear_queue_port(work_q,
584 port);
585 goto Again;
586 }
587 }
588 if (i->dft->lldd_clear_nexus_ha) {
589 SAS_DPRINTK("clear nexus ha\n");
590 res = i->dft->lldd_clear_nexus_ha(ha);
591 if (res == TMF_RESP_FUNC_COMPLETE) {
592 SAS_DPRINTK("clear nexus ha "
593 "succeeded\n");
594 task->task_done(task);
595 if (need_reset)
596 try_to_reset_cmd_device(shost, cmd);
597 goto out;
598 }
599 }
600 /* If we are here -- this means that no amount
601 * of effort could recover from errors. Quite
602 * possibly the HA just disappeared.
603 */
604 SAS_DPRINTK("error from device %llx, LUN %x "
605 "couldn't be recovered in any way\n",
606 SAS_ADDR(task->dev->sas_addr),
607 cmd->device->lun);
608
609 task->task_done(task);
610 if (need_reset)
611 try_to_reset_cmd_device(shost, cmd);
612 goto clear_q;
613 }
614 }
615 out:
616 return list_empty(work_q);
617 clear_q:
618 SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
619 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
620 struct sas_task *task = TO_SAS_TASK(cmd);
621 list_del_init(&cmd->eh_entry);
622 task->task_done(task);
623 }
624 return list_empty(work_q);
625 }
626
627 void sas_scsi_recover_host(struct Scsi_Host *shost)
628 {
629 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
630 unsigned long flags;
631 LIST_HEAD(eh_work_q);
632
633 spin_lock_irqsave(shost->host_lock, flags);
634 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
635 spin_unlock_irqrestore(shost->host_lock, flags);
636
637 SAS_DPRINTK("Enter %s\n", __FUNCTION__);
638 /*
639 * Deal with commands that still have SAS tasks (i.e. they didn't
640 * complete via the normal sas_task completion mechanism)
641 */
642 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
643 goto out;
644
645 /*
646 * Now deal with SCSI commands that completed ok but have a an error
647 * code (and hopefully sense data) attached. This is roughly what
648 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
649 * command we see here has no sas_task and is thus unknown to the HA.
650 */
651 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
652 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
653
654 out:
655 scsi_eh_flush_done_q(&ha->eh_done_q);
656 SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
657 return;
658 }
659
660 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
661 {
662 struct sas_task *task = TO_SAS_TASK(cmd);
663 unsigned long flags;
664
665 if (!task) {
666 cmd->timeout_per_command /= 2;
667 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
668 cmd, task, (cmd->timeout_per_command ?
669 "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
670 if (!cmd->timeout_per_command)
671 return EH_NOT_HANDLED;
672 return EH_RESET_TIMER;
673 }
674
675 spin_lock_irqsave(&task->task_state_lock, flags);
676 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
677 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
678 spin_unlock_irqrestore(&task->task_state_lock, flags);
679 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
680 cmd, task);
681 return EH_HANDLED;
682 }
683 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
684 spin_unlock_irqrestore(&task->task_state_lock, flags);
685 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
686 "EH_RESET_TIMER\n",
687 cmd, task);
688 return EH_RESET_TIMER;
689 }
690 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
691 spin_unlock_irqrestore(&task->task_state_lock, flags);
692
693 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
694 cmd, task);
695
696 return EH_NOT_HANDLED;
697 }
698
699 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
700 {
701 struct domain_device *dev = sdev_to_domain_dev(sdev);
702
703 if (dev_is_sata(dev))
704 return ata_scsi_ioctl(sdev, cmd, arg);
705
706 return -EINVAL;
707 }
708
709 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
710 {
711 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
712 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
713 struct domain_device *found_dev = NULL;
714 int i;
715 unsigned long flags;
716
717 spin_lock_irqsave(&ha->phy_port_lock, flags);
718 for (i = 0; i < ha->num_phys; i++) {
719 struct asd_sas_port *port = ha->sas_port[i];
720 struct domain_device *dev;
721
722 spin_lock(&port->dev_list_lock);
723 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
724 if (rphy == dev->rphy) {
725 found_dev = dev;
726 spin_unlock(&port->dev_list_lock);
727 goto found;
728 }
729 }
730 spin_unlock(&port->dev_list_lock);
731 }
732 found:
733 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
734
735 return found_dev;
736 }
737
738 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
739 {
740 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
741
742 return sas_find_dev_by_rphy(rphy);
743 }
744
745 int sas_target_alloc(struct scsi_target *starget)
746 {
747 struct domain_device *found_dev = sas_find_target(starget);
748 int res;
749
750 if (!found_dev)
751 return -ENODEV;
752
753 if (dev_is_sata(found_dev)) {
754 res = sas_ata_init_host_and_port(found_dev, starget);
755 if (res)
756 return res;
757 }
758
759 starget->hostdata = found_dev;
760 return 0;
761 }
762
763 #define SAS_DEF_QD 32
764 #define SAS_MAX_QD 64
765
766 int sas_slave_configure(struct scsi_device *scsi_dev)
767 {
768 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
769 struct sas_ha_struct *sas_ha;
770
771 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
772
773 if (dev_is_sata(dev)) {
774 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
775 return 0;
776 }
777
778 sas_ha = dev->port->ha;
779
780 sas_read_port_mode_page(scsi_dev);
781
782 if (scsi_dev->tagged_supported) {
783 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
784 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
785 } else {
786 SAS_DPRINTK("device %llx, LUN %x doesn't support "
787 "TCQ\n", SAS_ADDR(dev->sas_addr),
788 scsi_dev->lun);
789 scsi_dev->tagged_supported = 0;
790 scsi_set_tag_type(scsi_dev, 0);
791 scsi_deactivate_tcq(scsi_dev, 1);
792 }
793
794 scsi_dev->allow_restart = 1;
795
796 return 0;
797 }
798
799 void sas_slave_destroy(struct scsi_device *scsi_dev)
800 {
801 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
802
803 if (dev_is_sata(dev))
804 ata_port_disable(dev->sata_dev.ap);
805 }
806
807 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
808 {
809 int res = min(new_depth, SAS_MAX_QD);
810
811 if (scsi_dev->tagged_supported)
812 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
813 res);
814 else {
815 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
816 sas_printk("device %llx LUN %x queue depth changed to 1\n",
817 SAS_ADDR(dev->sas_addr),
818 scsi_dev->lun);
819 scsi_adjust_queue_depth(scsi_dev, 0, 1);
820 res = 1;
821 }
822
823 return res;
824 }
825
826 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
827 {
828 if (!scsi_dev->tagged_supported)
829 return 0;
830
831 scsi_deactivate_tcq(scsi_dev, 1);
832
833 scsi_set_tag_type(scsi_dev, qt);
834 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
835
836 return qt;
837 }
838
839 int sas_bios_param(struct scsi_device *scsi_dev,
840 struct block_device *bdev,
841 sector_t capacity, int *hsc)
842 {
843 hsc[0] = 255;
844 hsc[1] = 63;
845 sector_div(capacity, 255*63);
846 hsc[2] = capacity;
847
848 return 0;
849 }
850
851 /* ---------- Task Collector Thread implementation ---------- */
852
853 static void sas_queue(struct sas_ha_struct *sas_ha)
854 {
855 struct scsi_core *core = &sas_ha->core;
856 unsigned long flags;
857 LIST_HEAD(q);
858 int can_queue;
859 int res;
860 struct sas_internal *i = to_sas_internal(core->shost->transportt);
861
862 spin_lock_irqsave(&core->task_queue_lock, flags);
863 while (!kthread_should_stop() &&
864 !list_empty(&core->task_queue)) {
865
866 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
867 if (can_queue >= 0) {
868 can_queue = core->task_queue_size;
869 list_splice_init(&core->task_queue, &q);
870 } else {
871 struct list_head *a, *n;
872
873 can_queue = sas_ha->lldd_queue_size;
874 list_for_each_safe(a, n, &core->task_queue) {
875 list_move_tail(a, &q);
876 if (--can_queue == 0)
877 break;
878 }
879 can_queue = sas_ha->lldd_queue_size;
880 }
881 core->task_queue_size -= can_queue;
882 spin_unlock_irqrestore(&core->task_queue_lock, flags);
883 {
884 struct sas_task *task = list_entry(q.next,
885 struct sas_task,
886 list);
887 list_del_init(&q);
888 res = i->dft->lldd_execute_task(task, can_queue,
889 GFP_KERNEL);
890 if (unlikely(res))
891 __list_add(&q, task->list.prev, &task->list);
892 }
893 spin_lock_irqsave(&core->task_queue_lock, flags);
894 if (res) {
895 list_splice_init(&q, &core->task_queue); /*at head*/
896 core->task_queue_size += can_queue;
897 }
898 }
899 spin_unlock_irqrestore(&core->task_queue_lock, flags);
900 }
901
902 /**
903 * sas_queue_thread -- The Task Collector thread
904 * @_sas_ha: pointer to struct sas_ha
905 */
906 static int sas_queue_thread(void *_sas_ha)
907 {
908 struct sas_ha_struct *sas_ha = _sas_ha;
909
910 while (1) {
911 set_current_state(TASK_INTERRUPTIBLE);
912 schedule();
913 sas_queue(sas_ha);
914 if (kthread_should_stop())
915 break;
916 }
917
918 return 0;
919 }
920
921 int sas_init_queue(struct sas_ha_struct *sas_ha)
922 {
923 struct scsi_core *core = &sas_ha->core;
924
925 spin_lock_init(&core->task_queue_lock);
926 core->task_queue_size = 0;
927 INIT_LIST_HEAD(&core->task_queue);
928
929 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
930 "sas_queue_%d", core->shost->host_no);
931 if (IS_ERR(core->queue_thread))
932 return PTR_ERR(core->queue_thread);
933 return 0;
934 }
935
936 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
937 {
938 unsigned long flags;
939 struct scsi_core *core = &sas_ha->core;
940 struct sas_task *task, *n;
941
942 kthread_stop(core->queue_thread);
943
944 if (!list_empty(&core->task_queue))
945 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
946 SAS_ADDR(sas_ha->sas_addr));
947
948 spin_lock_irqsave(&core->task_queue_lock, flags);
949 list_for_each_entry_safe(task, n, &core->task_queue, list) {
950 struct scsi_cmnd *cmd = task->uldd_task;
951
952 list_del_init(&task->list);
953
954 ASSIGN_SAS_TASK(cmd, NULL);
955 sas_free_task(task);
956 cmd->result = DID_ABORT << 16;
957 cmd->scsi_done(cmd);
958 }
959 spin_unlock_irqrestore(&core->task_queue_lock, flags);
960 }
961
962 /*
963 * Call the LLDD task abort routine directly. This function is intended for
964 * use by upper layers that need to tell the LLDD to abort a task.
965 */
966 int __sas_task_abort(struct sas_task *task)
967 {
968 struct sas_internal *si =
969 to_sas_internal(task->dev->port->ha->core.shost->transportt);
970 unsigned long flags;
971 int res;
972
973 spin_lock_irqsave(&task->task_state_lock, flags);
974 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
975 task->task_state_flags & SAS_TASK_STATE_DONE) {
976 spin_unlock_irqrestore(&task->task_state_lock, flags);
977 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
978 task);
979 return 0;
980 }
981 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
982 spin_unlock_irqrestore(&task->task_state_lock, flags);
983
984 if (!si->dft->lldd_abort_task)
985 return -ENODEV;
986
987 res = si->dft->lldd_abort_task(task);
988
989 spin_lock_irqsave(&task->task_state_lock, flags);
990 if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
991 (res == TMF_RESP_FUNC_COMPLETE))
992 {
993 spin_unlock_irqrestore(&task->task_state_lock, flags);
994 task->task_done(task);
995 return 0;
996 }
997
998 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
999 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1000 spin_unlock_irqrestore(&task->task_state_lock, flags);
1001
1002 return -EAGAIN;
1003 }
1004
1005 /*
1006 * Tell an upper layer that it needs to initiate an abort for a given task.
1007 * This should only ever be called by an LLDD.
1008 */
1009 void sas_task_abort(struct sas_task *task)
1010 {
1011 struct scsi_cmnd *sc = task->uldd_task;
1012
1013 /* Escape for libsas internal commands */
1014 if (!sc) {
1015 if (!del_timer(&task->timer))
1016 return;
1017 task->timer.function(task->timer.data);
1018 return;
1019 }
1020
1021 if (dev_is_sata(task->dev)) {
1022 sas_ata_task_abort(task);
1023 return;
1024 }
1025
1026 scsi_req_abort_cmd(sc);
1027 scsi_schedule_eh(sc->device->host);
1028 }
1029
1030 int sas_slave_alloc(struct scsi_device *scsi_dev)
1031 {
1032 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1033
1034 if (dev_is_sata(dev))
1035 return ata_sas_port_init(dev->sata_dev.ap);
1036
1037 return 0;
1038 }
1039
1040 void sas_target_destroy(struct scsi_target *starget)
1041 {
1042 struct domain_device *found_dev = sas_find_target(starget);
1043
1044 if (!found_dev)
1045 return;
1046
1047 if (dev_is_sata(found_dev))
1048 ata_sas_port_destroy(found_dev->sata_dev.ap);
1049
1050 return;
1051 }
1052
1053 EXPORT_SYMBOL_GPL(sas_queuecommand);
1054 EXPORT_SYMBOL_GPL(sas_target_alloc);
1055 EXPORT_SYMBOL_GPL(sas_slave_configure);
1056 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1057 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1058 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1059 EXPORT_SYMBOL_GPL(sas_bios_param);
1060 EXPORT_SYMBOL_GPL(__sas_task_abort);
1061 EXPORT_SYMBOL_GPL(sas_task_abort);
1062 EXPORT_SYMBOL_GPL(sas_phy_reset);
1063 EXPORT_SYMBOL_GPL(sas_phy_enable);
1064 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1065 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1066 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1067 EXPORT_SYMBOL_GPL(sas_target_destroy);
1068 EXPORT_SYMBOL_GPL(sas_ioctl);
WRT350N Kernel Patches