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[SCSI] libsas,libata: fix ->change_queue_{depth|type} for sata devices
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / libsas / sas_scsi_host.c
blob8f3c4cc1bfe41638ffa2af50d4019346a1d5b3a7
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/ctype.h>
29
30 #include "sas_internal.h"
31
32 #include <scsi/scsi_host.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_tcq.h>
35 #include <scsi/scsi.h>
36 #include <scsi/scsi_eh.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_sas.h>
39 #include <scsi/sas_ata.h>
40 #include "../scsi_sas_internal.h"
41 #include "../scsi_transport_api.h"
42 #include "../scsi_priv.h"
43
44 #include <linux/err.h>
45 #include <linux/blkdev.h>
46 #include <linux/freezer.h>
47 #include <linux/gfp.h>
48 #include <linux/scatterlist.h>
49 #include <linux/libata.h>
50
51 /* ---------- SCSI Host glue ---------- */
52
53 static void sas_scsi_task_done(struct sas_task *task)
54 {
55 struct task_status_struct *ts = &task->task_status;
56 struct scsi_cmnd *sc = task->uldd_task;
57 int hs = 0, stat = 0;
58
59 if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
60 /* Aborted tasks will be completed by the error handler */
61 SAS_DPRINTK("task done but aborted\n");
62 return;
63 }
64
65 if (unlikely(!sc)) {
66 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
67 list_del_init(&task->list);
68 sas_free_task(task);
69 return;
70 }
71
72 if (ts->resp == SAS_TASK_UNDELIVERED) {
73 /* transport error */
74 hs = DID_NO_CONNECT;
75 } else { /* ts->resp == SAS_TASK_COMPLETE */
76 /* task delivered, what happened afterwards? */
77 switch (ts->stat) {
78 case SAS_DEV_NO_RESPONSE:
79 case SAS_INTERRUPTED:
80 case SAS_PHY_DOWN:
81 case SAS_NAK_R_ERR:
82 case SAS_OPEN_TO:
83 hs = DID_NO_CONNECT;
84 break;
85 case SAS_DATA_UNDERRUN:
86 scsi_set_resid(sc, ts->residual);
87 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
88 hs = DID_ERROR;
89 break;
90 case SAS_DATA_OVERRUN:
91 hs = DID_ERROR;
92 break;
93 case SAS_QUEUE_FULL:
94 hs = DID_SOFT_ERROR; /* retry */
95 break;
96 case SAS_DEVICE_UNKNOWN:
97 hs = DID_BAD_TARGET;
98 break;
99 case SAS_SG_ERR:
100 hs = DID_PARITY;
101 break;
102 case SAS_OPEN_REJECT:
103 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
104 hs = DID_SOFT_ERROR; /* retry */
105 else
106 hs = DID_ERROR;
107 break;
108 case SAS_PROTO_RESPONSE:
109 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
110 "task; please report this\n",
111 task->dev->port->ha->sas_ha_name);
112 break;
113 case SAS_ABORTED_TASK:
114 hs = DID_ABORT;
115 break;
116 case SAM_STAT_CHECK_CONDITION:
117 memcpy(sc->sense_buffer, ts->buf,
118 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
119 stat = SAM_STAT_CHECK_CONDITION;
120 break;
121 default:
122 stat = ts->stat;
123 break;
124 }
125 }
126 ASSIGN_SAS_TASK(sc, NULL);
127 sc->result = (hs << 16) | stat;
128 list_del_init(&task->list);
129 sas_free_task(task);
130 sc->scsi_done(sc);
131 }
132
133 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
134 struct domain_device *dev,
135 gfp_t gfp_flags)
136 {
137 struct sas_task *task = sas_alloc_task(gfp_flags);
138 struct scsi_lun lun;
139
140 if (!task)
141 return NULL;
142
143 task->uldd_task = cmd;
144 ASSIGN_SAS_TASK(cmd, task);
145
146 task->dev = dev;
147 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
148
149 task->ssp_task.retry_count = 1;
150 int_to_scsilun(cmd->device->lun, &lun);
151 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
152 task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
153 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
154
155 task->scatter = scsi_sglist(cmd);
156 task->num_scatter = scsi_sg_count(cmd);
157 task->total_xfer_len = scsi_bufflen(cmd);
158 task->data_dir = cmd->sc_data_direction;
159
160 task->task_done = sas_scsi_task_done;
161
162 return task;
163 }
164
165 int sas_queue_up(struct sas_task *task)
166 {
167 struct sas_ha_struct *sas_ha = task->dev->port->ha;
168 struct scsi_core *core = &sas_ha->core;
169 unsigned long flags;
170 LIST_HEAD(list);
171
172 spin_lock_irqsave(&core->task_queue_lock, flags);
173 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
174 spin_unlock_irqrestore(&core->task_queue_lock, flags);
175 return -SAS_QUEUE_FULL;
176 }
177 list_add_tail(&task->list, &core->task_queue);
178 core->task_queue_size += 1;
179 spin_unlock_irqrestore(&core->task_queue_lock, flags);
180 wake_up_process(core->queue_thread);
181
182 return 0;
183 }
184
185 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
186 {
187 struct sas_internal *i = to_sas_internal(host->transportt);
188 struct domain_device *dev = cmd_to_domain_dev(cmd);
189 struct sas_ha_struct *sas_ha = dev->port->ha;
190 struct sas_task *task;
191 int res = 0;
192
193 /* If the device fell off, no sense in issuing commands */
194 if (dev->gone) {
195 cmd->result = DID_BAD_TARGET << 16;
196 goto out_done;
197 }
198
199 if (dev_is_sata(dev)) {
200 unsigned long flags;
201
202 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
203 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
204 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
205 return res;
206 }
207
208 task = sas_create_task(cmd, dev, GFP_ATOMIC);
209 if (!task)
210 return SCSI_MLQUEUE_HOST_BUSY;
211
212 /* Queue up, Direct Mode or Task Collector Mode. */
213 if (sas_ha->lldd_max_execute_num < 2)
214 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
215 else
216 res = sas_queue_up(task);
217
218 if (res)
219 goto out_free_task;
220 return 0;
221
222 out_free_task:
223 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
224 ASSIGN_SAS_TASK(cmd, NULL);
225 sas_free_task(task);
226 if (res == -SAS_QUEUE_FULL)
227 cmd->result = DID_SOFT_ERROR << 16; /* retry */
228 else
229 cmd->result = DID_ERROR << 16;
230 out_done:
231 cmd->scsi_done(cmd);
232 return 0;
233 }
234
235 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
236 {
237 struct sas_task *task = TO_SAS_TASK(cmd);
238 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
239
240 /* remove the aborted task flag to allow the task to be
241 * completed now. At this point, we only get called following
242 * an actual abort of the task, so we should be guaranteed not
243 * to be racing with any completions from the LLD (hence we
244 * don't need the task state lock to clear the flag) */
245 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
246 /* Now call task_done. However, task will be free'd after
247 * this */
248 task->task_done(task);
249 /* now finish the command and move it on to the error
250 * handler done list, this also takes it off the
251 * error handler pending list */
252 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
253 }
254
255 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
256 {
257 struct scsi_cmnd *cmd, *n;
258
259 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
260 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
261 cmd->device->lun == my_cmd->device->lun)
262 sas_eh_finish_cmd(cmd);
263 }
264 }
265
266 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
267 struct domain_device *dev)
268 {
269 struct scsi_cmnd *cmd, *n;
270
271 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
272 struct domain_device *x = cmd_to_domain_dev(cmd);
273
274 if (x == dev)
275 sas_eh_finish_cmd(cmd);
276 }
277 }
278
279 static void sas_scsi_clear_queue_port(struct list_head *error_q,
280 struct asd_sas_port *port)
281 {
282 struct scsi_cmnd *cmd, *n;
283
284 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
285 struct domain_device *dev = cmd_to_domain_dev(cmd);
286 struct asd_sas_port *x = dev->port;
287
288 if (x == port)
289 sas_eh_finish_cmd(cmd);
290 }
291 }
292
293 enum task_disposition {
294 TASK_IS_DONE,
295 TASK_IS_ABORTED,
296 TASK_IS_AT_LU,
297 TASK_IS_NOT_AT_LU,
298 TASK_ABORT_FAILED,
299 };
300
301 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
302 {
303 struct sas_ha_struct *ha = task->dev->port->ha;
304 unsigned long flags;
305 int i, res;
306 struct sas_internal *si =
307 to_sas_internal(task->dev->port->ha->core.shost->transportt);
308
309 if (ha->lldd_max_execute_num > 1) {
310 struct scsi_core *core = &ha->core;
311 struct sas_task *t, *n;
312
313 spin_lock_irqsave(&core->task_queue_lock, flags);
314 list_for_each_entry_safe(t, n, &core->task_queue, list) {
315 if (task == t) {
316 list_del_init(&t->list);
317 spin_unlock_irqrestore(&core->task_queue_lock,
318 flags);
319 SAS_DPRINTK("%s: task 0x%p aborted from "
320 "task_queue\n",
321 __func__, task);
322 return TASK_IS_ABORTED;
323 }
324 }
325 spin_unlock_irqrestore(&core->task_queue_lock, flags);
326 }
327
328 for (i = 0; i < 5; i++) {
329 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
330 res = si->dft->lldd_abort_task(task);
331
332 spin_lock_irqsave(&task->task_state_lock, flags);
333 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
334 spin_unlock_irqrestore(&task->task_state_lock, flags);
335 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
336 task);
337 return TASK_IS_DONE;
338 }
339 spin_unlock_irqrestore(&task->task_state_lock, flags);
340
341 if (res == TMF_RESP_FUNC_COMPLETE) {
342 SAS_DPRINTK("%s: task 0x%p is aborted\n",
343 __func__, task);
344 return TASK_IS_ABORTED;
345 } else if (si->dft->lldd_query_task) {
346 SAS_DPRINTK("%s: querying task 0x%p\n",
347 __func__, task);
348 res = si->dft->lldd_query_task(task);
349 switch (res) {
350 case TMF_RESP_FUNC_SUCC:
351 SAS_DPRINTK("%s: task 0x%p at LU\n",
352 __func__, task);
353 return TASK_IS_AT_LU;
354 case TMF_RESP_FUNC_COMPLETE:
355 SAS_DPRINTK("%s: task 0x%p not at LU\n",
356 __func__, task);
357 return TASK_IS_NOT_AT_LU;
358 case TMF_RESP_FUNC_FAILED:
359 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
360 __func__, task);
361 return TASK_ABORT_FAILED;
362 }
363
364 }
365 }
366 return res;
367 }
368
369 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
370 {
371 int res = TMF_RESP_FUNC_FAILED;
372 struct scsi_lun lun;
373 struct sas_internal *i =
374 to_sas_internal(dev->port->ha->core.shost->transportt);
375
376 int_to_scsilun(cmd->device->lun, &lun);
377
378 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
379 SAS_ADDR(dev->sas_addr),
380 cmd->device->lun);
381
382 if (i->dft->lldd_abort_task_set)
383 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
384
385 if (res == TMF_RESP_FUNC_FAILED) {
386 if (i->dft->lldd_clear_task_set)
387 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
388 }
389
390 if (res == TMF_RESP_FUNC_FAILED) {
391 if (i->dft->lldd_lu_reset)
392 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
393 }
394
395 return res;
396 }
397
398 static int sas_recover_I_T(struct domain_device *dev)
399 {
400 int res = TMF_RESP_FUNC_FAILED;
401 struct sas_internal *i =
402 to_sas_internal(dev->port->ha->core.shost->transportt);
403
404 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
405 SAS_ADDR(dev->sas_addr));
406
407 if (i->dft->lldd_I_T_nexus_reset)
408 res = i->dft->lldd_I_T_nexus_reset(dev);
409
410 return res;
411 }
412
413 /* Find the sas_phy that's attached to this device */
414 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
415 {
416 struct domain_device *pdev = dev->parent;
417 struct ex_phy *exphy = NULL;
418 int i;
419
420 /* Directly attached device */
421 if (!pdev)
422 return dev->port->phy;
423
424 /* Otherwise look in the expander */
425 for (i = 0; i < pdev->ex_dev.num_phys; i++)
426 if (!memcmp(dev->sas_addr,
427 pdev->ex_dev.ex_phy[i].attached_sas_addr,
428 SAS_ADDR_SIZE)) {
429 exphy = &pdev->ex_dev.ex_phy[i];
430 break;
431 }
432
433 BUG_ON(!exphy);
434 return exphy->phy;
435 }
436 EXPORT_SYMBOL_GPL(sas_find_local_phy);
437
438 /* Attempt to send a LUN reset message to a device */
439 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
440 {
441 struct domain_device *dev = cmd_to_domain_dev(cmd);
442 struct sas_internal *i =
443 to_sas_internal(dev->port->ha->core.shost->transportt);
444 struct scsi_lun lun;
445 int res;
446
447 int_to_scsilun(cmd->device->lun, &lun);
448
449 if (!i->dft->lldd_lu_reset)
450 return FAILED;
451
452 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
453 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
454 return SUCCESS;
455
456 return FAILED;
457 }
458
459 /* Attempt to send a phy (bus) reset */
460 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
461 {
462 struct domain_device *dev = cmd_to_domain_dev(cmd);
463 struct sas_phy *phy = sas_find_local_phy(dev);
464 int res;
465
466 res = sas_phy_reset(phy, 1);
467 if (res)
468 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
469 kobject_name(&phy->dev.kobj),
470 res);
471 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
472 return SUCCESS;
473
474 return FAILED;
475 }
476
477 /* Try to reset a device */
478 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
479 {
480 int res;
481 struct Scsi_Host *shost = cmd->device->host;
482
483 if (!shost->hostt->eh_device_reset_handler)
484 goto try_bus_reset;
485
486 res = shost->hostt->eh_device_reset_handler(cmd);
487 if (res == SUCCESS)
488 return res;
489
490 try_bus_reset:
491 if (shost->hostt->eh_bus_reset_handler)
492 return shost->hostt->eh_bus_reset_handler(cmd);
493
494 return FAILED;
495 }
496
497 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
498 struct list_head *work_q,
499 struct list_head *done_q)
500 {
501 struct scsi_cmnd *cmd, *n;
502 enum task_disposition res = TASK_IS_DONE;
503 int tmf_resp, need_reset;
504 struct sas_internal *i = to_sas_internal(shost->transportt);
505 unsigned long flags;
506 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
507
508 Again:
509 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
510 struct sas_task *task = TO_SAS_TASK(cmd);
511
512 if (!task)
513 continue;
514
515 list_del_init(&cmd->eh_entry);
516
517 spin_lock_irqsave(&task->task_state_lock, flags);
518 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
519 spin_unlock_irqrestore(&task->task_state_lock, flags);
520
521 if (need_reset) {
522 SAS_DPRINTK("%s: task 0x%p requests reset\n",
523 __func__, task);
524 goto reset;
525 }
526
527 SAS_DPRINTK("trying to find task 0x%p\n", task);
528 res = sas_scsi_find_task(task);
529
530 cmd->eh_eflags = 0;
531
532 switch (res) {
533 case TASK_IS_DONE:
534 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
535 task);
536 sas_eh_finish_cmd(cmd);
537 continue;
538 case TASK_IS_ABORTED:
539 SAS_DPRINTK("%s: task 0x%p is aborted\n",
540 __func__, task);
541 sas_eh_finish_cmd(cmd);
542 continue;
543 case TASK_IS_AT_LU:
544 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
545 reset:
546 tmf_resp = sas_recover_lu(task->dev, cmd);
547 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
548 SAS_DPRINTK("dev %016llx LU %x is "
549 "recovered\n",
550 SAS_ADDR(task->dev),
551 cmd->device->lun);
552 sas_eh_finish_cmd(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 struct domain_device *dev = task->dev;
564 SAS_DPRINTK("I_T %016llx recovered\n",
565 SAS_ADDR(task->dev->sas_addr));
566 sas_eh_finish_cmd(cmd);
567 sas_scsi_clear_queue_I_T(work_q, dev);
568 goto Again;
569 }
570 /* Hammer time :-) */
571 try_to_reset_cmd_device(cmd);
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 sas_eh_finish_cmd(cmd);
581 sas_scsi_clear_queue_port(work_q,
582 port);
583 goto Again;
584 }
585 }
586 if (i->dft->lldd_clear_nexus_ha) {
587 SAS_DPRINTK("clear nexus ha\n");
588 res = i->dft->lldd_clear_nexus_ha(ha);
589 if (res == TMF_RESP_FUNC_COMPLETE) {
590 SAS_DPRINTK("clear nexus ha "
591 "succeeded\n");
592 sas_eh_finish_cmd(cmd);
593 goto clear_q;
594 }
595 }
596 /* If we are here -- this means that no amount
597 * of effort could recover from errors. Quite
598 * possibly the HA just disappeared.
599 */
600 SAS_DPRINTK("error from device %llx, LUN %x "
601 "couldn't be recovered in any way\n",
602 SAS_ADDR(task->dev->sas_addr),
603 cmd->device->lun);
604
605 sas_eh_finish_cmd(cmd);
606 goto clear_q;
607 }
608 }
609 return list_empty(work_q);
610 clear_q:
611 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
612 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
613 sas_eh_finish_cmd(cmd);
614
615 return list_empty(work_q);
616 }
617
618 void sas_scsi_recover_host(struct Scsi_Host *shost)
619 {
620 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
621 unsigned long flags;
622 LIST_HEAD(eh_work_q);
623
624 spin_lock_irqsave(shost->host_lock, flags);
625 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
626 shost->host_eh_scheduled = 0;
627 spin_unlock_irqrestore(shost->host_lock, flags);
628
629 SAS_DPRINTK("Enter %s\n", __func__);
630 /*
631 * Deal with commands that still have SAS tasks (i.e. they didn't
632 * complete via the normal sas_task completion mechanism)
633 */
634 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
635 goto out;
636
637 /*
638 * Now deal with SCSI commands that completed ok but have a an error
639 * code (and hopefully sense data) attached. This is roughly what
640 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
641 * command we see here has no sas_task and is thus unknown to the HA.
642 */
643 if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
644 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
645 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
646
647 out:
648 /* now link into libata eh --- if we have any ata devices */
649 sas_ata_strategy_handler(shost);
650
651 scsi_eh_flush_done_q(&ha->eh_done_q);
652
653 SAS_DPRINTK("--- Exit %s\n", __func__);
654 return;
655 }
656
657 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
658 {
659 struct sas_task *task = TO_SAS_TASK(cmd);
660 unsigned long flags;
661 enum blk_eh_timer_return rtn;
662
663 if (sas_ata_timed_out(cmd, task, &rtn))
664 return rtn;
665
666 if (!task) {
667 cmd->request->timeout /= 2;
668 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
669 cmd, task, (cmd->request->timeout ?
670 "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
671 if (!cmd->request->timeout)
672 return BLK_EH_NOT_HANDLED;
673 return BLK_EH_RESET_TIMER;
674 }
675
676 spin_lock_irqsave(&task->task_state_lock, flags);
677 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
678 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
679 spin_unlock_irqrestore(&task->task_state_lock, flags);
680 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
681 "BLK_EH_HANDLED\n", cmd, task);
682 return BLK_EH_HANDLED;
683 }
684 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
685 spin_unlock_irqrestore(&task->task_state_lock, flags);
686 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
687 "BLK_EH_RESET_TIMER\n",
688 cmd, task);
689 return BLK_EH_RESET_TIMER;
690 }
691 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
692 spin_unlock_irqrestore(&task->task_state_lock, flags);
693
694 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
695 cmd, task);
696
697 return BLK_EH_NOT_HANDLED;
698 }
699
700 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
701 {
702 struct domain_device *dev = sdev_to_domain_dev(sdev);
703
704 if (dev_is_sata(dev))
705 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
706
707 return -EINVAL;
708 }
709
710 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
711 {
712 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
713 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
714 struct domain_device *found_dev = NULL;
715 int i;
716 unsigned long flags;
717
718 spin_lock_irqsave(&ha->phy_port_lock, flags);
719 for (i = 0; i < ha->num_phys; i++) {
720 struct asd_sas_port *port = ha->sas_port[i];
721 struct domain_device *dev;
722
723 spin_lock(&port->dev_list_lock);
724 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
725 if (rphy == dev->rphy) {
726 found_dev = dev;
727 spin_unlock(&port->dev_list_lock);
728 goto found;
729 }
730 }
731 spin_unlock(&port->dev_list_lock);
732 }
733 found:
734 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
735
736 return found_dev;
737 }
738
739 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
740 {
741 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
742
743 return sas_find_dev_by_rphy(rphy);
744 }
745
746 int sas_target_alloc(struct scsi_target *starget)
747 {
748 struct domain_device *found_dev = sas_find_target(starget);
749 int res;
750
751 if (!found_dev)
752 return -ENODEV;
753
754 if (dev_is_sata(found_dev)) {
755 res = sas_ata_init_host_and_port(found_dev, starget);
756 if (res)
757 return res;
758 }
759
760 starget->hostdata = found_dev;
761 return 0;
762 }
763
764 #define SAS_DEF_QD 32
765 #define SAS_MAX_QD 64
766
767 int sas_slave_configure(struct scsi_device *scsi_dev)
768 {
769 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
770 struct sas_ha_struct *sas_ha;
771
772 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
773
774 if (dev_is_sata(dev)) {
775 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
776 return 0;
777 }
778
779 sas_ha = dev->port->ha;
780
781 sas_read_port_mode_page(scsi_dev);
782
783 if (scsi_dev->tagged_supported) {
784 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
785 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
786 } else {
787 SAS_DPRINTK("device %llx, LUN %x doesn't support "
788 "TCQ\n", SAS_ADDR(dev->sas_addr),
789 scsi_dev->lun);
790 scsi_dev->tagged_supported = 0;
791 scsi_set_tag_type(scsi_dev, 0);
792 scsi_deactivate_tcq(scsi_dev, 1);
793 }
794
795 scsi_dev->allow_restart = 1;
796
797 return 0;
798 }
799
800 void sas_slave_destroy(struct scsi_device *scsi_dev)
801 {
802 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
803
804 if (dev_is_sata(dev))
805 dev->sata_dev.ap->link.device[0].class = ATA_DEV_NONE;
806 }
807
808 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth,
809 int reason)
810 {
811 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
812 int res = min(new_depth, SAS_MAX_QD);
813
814 if (dev_is_sata(dev))
815 return __ata_change_queue_depth(dev->sata_dev.ap, scsi_dev,
816 new_depth, reason);
817
818 if (reason != SCSI_QDEPTH_DEFAULT)
819 return -EOPNOTSUPP;
820
821 if (scsi_dev->tagged_supported)
822 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
823 res);
824 else {
825 sas_printk("device %llx LUN %x queue depth changed to 1\n",
826 SAS_ADDR(dev->sas_addr),
827 scsi_dev->lun);
828 scsi_adjust_queue_depth(scsi_dev, 0, 1);
829 res = 1;
830 }
831
832 return res;
833 }
834
835 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
836 {
837 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
838
839 if (dev_is_sata(dev))
840 return -EINVAL;
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", __func__,
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 } else {
1038 struct request_queue *q = sc->device->request_queue;
1039 unsigned long flags;
1040
1041 spin_lock_irqsave(q->queue_lock, flags);
1042 blk_abort_request(sc->request);
1043 spin_unlock_irqrestore(q->queue_lock, flags);
1044 scsi_schedule_eh(sc->device->host);
1045 }
1046 }
1047
1048 int sas_slave_alloc(struct scsi_device *scsi_dev)
1049 {
1050 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1051
1052 if (dev_is_sata(dev))
1053 return ata_sas_port_init(dev->sata_dev.ap);
1054
1055 return 0;
1056 }
1057
1058 void sas_target_destroy(struct scsi_target *starget)
1059 {
1060 struct domain_device *found_dev = sas_find_target(starget);
1061
1062 if (!found_dev)
1063 return;
1064
1065 if (dev_is_sata(found_dev))
1066 ata_sas_port_destroy(found_dev->sata_dev.ap);
1067
1068 return;
1069 }
1070
1071 static void sas_parse_addr(u8 *sas_addr, const char *p)
1072 {
1073 int i;
1074 for (i = 0; i < SAS_ADDR_SIZE; i++) {
1075 u8 h, l;
1076 if (!*p)
1077 break;
1078 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1079 p++;
1080 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1081 p++;
1082 sas_addr[i] = (h<<4) | l;
1083 }
1084 }
1085
1086 #define SAS_STRING_ADDR_SIZE 16
1087
1088 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1089 {
1090 int res;
1091 const struct firmware *fw;
1092
1093 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1094 if (res)
1095 return res;
1096
1097 if (fw->size < SAS_STRING_ADDR_SIZE) {
1098 res = -ENODEV;
1099 goto out;
1100 }
1101
1102 sas_parse_addr(addr, fw->data);
1103
1104 out:
1105 release_firmware(fw);
1106 return res;
1107 }
1108 EXPORT_SYMBOL_GPL(sas_request_addr);
1109
1110 EXPORT_SYMBOL_GPL(sas_queuecommand);
1111 EXPORT_SYMBOL_GPL(sas_target_alloc);
1112 EXPORT_SYMBOL_GPL(sas_slave_configure);
1113 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1114 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1115 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1116 EXPORT_SYMBOL_GPL(sas_bios_param);
1117 EXPORT_SYMBOL_GPL(__sas_task_abort);
1118 EXPORT_SYMBOL_GPL(sas_task_abort);
1119 EXPORT_SYMBOL_GPL(sas_phy_reset);
1120 EXPORT_SYMBOL_GPL(sas_phy_enable);
1121 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1122 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1123 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1124 EXPORT_SYMBOL_GPL(sas_target_destroy);
1125 EXPORT_SYMBOL_GPL(sas_ioctl);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree