?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Blackfin arch: workaround bug: spi_mmc driver working in dma mode may hang the system
[linux-2.6/mini2440.git] / drivers / scsi / libsas / sas_scsi_host.c
blob744838780ada207964f5b8ffbc4749d6c098ae57
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/scatterlist.h>
48 #include <linux/libata.h>
49
50 /* ---------- SCSI Host glue ---------- */
51
52 static void sas_scsi_task_done(struct sas_task *task)
53 {
54 struct task_status_struct *ts = &task->task_status;
55 struct scsi_cmnd *sc = task->uldd_task;
56 int hs = 0, stat = 0;
57
58 if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
59 /* Aborted tasks will be completed by the error handler */
60 SAS_DPRINTK("task done but aborted\n");
61 return;
62 }
63
64 if (unlikely(!sc)) {
65 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
66 list_del_init(&task->list);
67 sas_free_task(task);
68 return;
69 }
70
71 if (ts->resp == SAS_TASK_UNDELIVERED) {
72 /* transport error */
73 hs = DID_NO_CONNECT;
74 } else { /* ts->resp == SAS_TASK_COMPLETE */
75 /* task delivered, what happened afterwards? */
76 switch (ts->stat) {
77 case SAS_DEV_NO_RESPONSE:
78 case SAS_INTERRUPTED:
79 case SAS_PHY_DOWN:
80 case SAS_NAK_R_ERR:
81 case SAS_OPEN_TO:
82 hs = DID_NO_CONNECT;
83 break;
84 case SAS_DATA_UNDERRUN:
85 scsi_set_resid(sc, ts->residual);
86 if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
87 hs = DID_ERROR;
88 break;
89 case SAS_DATA_OVERRUN:
90 hs = DID_ERROR;
91 break;
92 case SAS_QUEUE_FULL:
93 hs = DID_SOFT_ERROR; /* retry */
94 break;
95 case SAS_DEVICE_UNKNOWN:
96 hs = DID_BAD_TARGET;
97 break;
98 case SAS_SG_ERR:
99 hs = DID_PARITY;
100 break;
101 case SAS_OPEN_REJECT:
102 if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
103 hs = DID_SOFT_ERROR; /* retry */
104 else
105 hs = DID_ERROR;
106 break;
107 case SAS_PROTO_RESPONSE:
108 SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
109 "task; please report this\n",
110 task->dev->port->ha->sas_ha_name);
111 break;
112 case SAS_ABORTED_TASK:
113 hs = DID_ABORT;
114 break;
115 case SAM_CHECK_COND:
116 memcpy(sc->sense_buffer, ts->buf,
117 min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
118 stat = SAM_CHECK_COND;
119 break;
120 default:
121 stat = ts->stat;
122 break;
123 }
124 }
125 ASSIGN_SAS_TASK(sc, NULL);
126 sc->result = (hs << 16) | stat;
127 list_del_init(&task->list);
128 sas_free_task(task);
129 sc->scsi_done(sc);
130 }
131
132 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
133 {
134 enum task_attribute ta = TASK_ATTR_SIMPLE;
135 if (cmd->request && blk_rq_tagged(cmd->request)) {
136 if (cmd->device->ordered_tags &&
137 (cmd->request->cmd_flags & REQ_HARDBARRIER))
138 ta = TASK_ATTR_ORDERED;
139 }
140 return ta;
141 }
142
143 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
144 struct domain_device *dev,
145 gfp_t gfp_flags)
146 {
147 struct sas_task *task = sas_alloc_task(gfp_flags);
148 struct scsi_lun lun;
149
150 if (!task)
151 return NULL;
152
153 task->uldd_task = cmd;
154 ASSIGN_SAS_TASK(cmd, task);
155
156 task->dev = dev;
157 task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
158
159 task->ssp_task.retry_count = 1;
160 int_to_scsilun(cmd->device->lun, &lun);
161 memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
162 task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
163 memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
164
165 task->scatter = scsi_sglist(cmd);
166 task->num_scatter = scsi_sg_count(cmd);
167 task->total_xfer_len = scsi_bufflen(cmd);
168 task->data_dir = cmd->sc_data_direction;
169
170 task->task_done = sas_scsi_task_done;
171
172 return task;
173 }
174
175 int sas_queue_up(struct sas_task *task)
176 {
177 struct sas_ha_struct *sas_ha = task->dev->port->ha;
178 struct scsi_core *core = &sas_ha->core;
179 unsigned long flags;
180 LIST_HEAD(list);
181
182 spin_lock_irqsave(&core->task_queue_lock, flags);
183 if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
184 spin_unlock_irqrestore(&core->task_queue_lock, flags);
185 return -SAS_QUEUE_FULL;
186 }
187 list_add_tail(&task->list, &core->task_queue);
188 core->task_queue_size += 1;
189 spin_unlock_irqrestore(&core->task_queue_lock, flags);
190 wake_up_process(core->queue_thread);
191
192 return 0;
193 }
194
195 /**
196 * sas_queuecommand -- Enqueue a command for processing
197 * @parameters: See SCSI Core documentation
198 *
199 * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
200 * call us without holding an IRQ spinlock...
201 */
202 int sas_queuecommand(struct scsi_cmnd *cmd,
203 void (*scsi_done)(struct scsi_cmnd *))
204 __releases(host->host_lock)
205 __acquires(dev->sata_dev.ap->lock)
206 __releases(dev->sata_dev.ap->lock)
207 __acquires(host->host_lock)
208 {
209 int res = 0;
210 struct domain_device *dev = cmd_to_domain_dev(cmd);
211 struct Scsi_Host *host = cmd->device->host;
212 struct sas_internal *i = to_sas_internal(host->transportt);
213
214 spin_unlock_irq(host->host_lock);
215
216 {
217 struct sas_ha_struct *sas_ha = dev->port->ha;
218 struct sas_task *task;
219
220 if (dev_is_sata(dev)) {
221 unsigned long flags;
222
223 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
224 res = ata_sas_queuecmd(cmd, scsi_done,
225 dev->sata_dev.ap);
226 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
227 goto out;
228 }
229
230 res = -ENOMEM;
231 task = sas_create_task(cmd, dev, GFP_ATOMIC);
232 if (!task)
233 goto out;
234
235 cmd->scsi_done = scsi_done;
236 /* Queue up, Direct Mode or Task Collector Mode. */
237 if (sas_ha->lldd_max_execute_num < 2)
238 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
239 else
240 res = sas_queue_up(task);
241
242 /* Examine */
243 if (res) {
244 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
245 ASSIGN_SAS_TASK(cmd, NULL);
246 sas_free_task(task);
247 if (res == -SAS_QUEUE_FULL) {
248 cmd->result = DID_SOFT_ERROR << 16; /* retry */
249 res = 0;
250 scsi_done(cmd);
251 }
252 goto out;
253 }
254 }
255 out:
256 spin_lock_irq(host->host_lock);
257 return res;
258 }
259
260 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
261 {
262 struct sas_task *task = TO_SAS_TASK(cmd);
263 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
264
265 /* remove the aborted task flag to allow the task to be
266 * completed now. At this point, we only get called following
267 * an actual abort of the task, so we should be guaranteed not
268 * to be racing with any completions from the LLD (hence we
269 * don't need the task state lock to clear the flag) */
270 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
271 /* Now call task_done. However, task will be free'd after
272 * this */
273 task->task_done(task);
274 /* now finish the command and move it on to the error
275 * handler done list, this also takes it off the
276 * error handler pending list */
277 scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
278 }
279
280 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
281 {
282 struct scsi_cmnd *cmd, *n;
283
284 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
285 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
286 cmd->device->lun == my_cmd->device->lun)
287 sas_eh_finish_cmd(cmd);
288 }
289 }
290
291 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
292 struct domain_device *dev)
293 {
294 struct scsi_cmnd *cmd, *n;
295
296 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
297 struct domain_device *x = cmd_to_domain_dev(cmd);
298
299 if (x == dev)
300 sas_eh_finish_cmd(cmd);
301 }
302 }
303
304 static void sas_scsi_clear_queue_port(struct list_head *error_q,
305 struct asd_sas_port *port)
306 {
307 struct scsi_cmnd *cmd, *n;
308
309 list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
310 struct domain_device *dev = cmd_to_domain_dev(cmd);
311 struct asd_sas_port *x = dev->port;
312
313 if (x == port)
314 sas_eh_finish_cmd(cmd);
315 }
316 }
317
318 enum task_disposition {
319 TASK_IS_DONE,
320 TASK_IS_ABORTED,
321 TASK_IS_AT_LU,
322 TASK_IS_NOT_AT_LU,
323 TASK_ABORT_FAILED,
324 };
325
326 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
327 {
328 struct sas_ha_struct *ha = task->dev->port->ha;
329 unsigned long flags;
330 int i, res;
331 struct sas_internal *si =
332 to_sas_internal(task->dev->port->ha->core.shost->transportt);
333
334 if (ha->lldd_max_execute_num > 1) {
335 struct scsi_core *core = &ha->core;
336 struct sas_task *t, *n;
337
338 spin_lock_irqsave(&core->task_queue_lock, flags);
339 list_for_each_entry_safe(t, n, &core->task_queue, list) {
340 if (task == t) {
341 list_del_init(&t->list);
342 spin_unlock_irqrestore(&core->task_queue_lock,
343 flags);
344 SAS_DPRINTK("%s: task 0x%p aborted from "
345 "task_queue\n",
346 __func__, task);
347 return TASK_IS_ABORTED;
348 }
349 }
350 spin_unlock_irqrestore(&core->task_queue_lock, flags);
351 }
352
353 for (i = 0; i < 5; i++) {
354 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
355 res = si->dft->lldd_abort_task(task);
356
357 spin_lock_irqsave(&task->task_state_lock, flags);
358 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
359 spin_unlock_irqrestore(&task->task_state_lock, flags);
360 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
361 task);
362 return TASK_IS_DONE;
363 }
364 spin_unlock_irqrestore(&task->task_state_lock, flags);
365
366 if (res == TMF_RESP_FUNC_COMPLETE) {
367 SAS_DPRINTK("%s: task 0x%p is aborted\n",
368 __func__, task);
369 return TASK_IS_ABORTED;
370 } else if (si->dft->lldd_query_task) {
371 SAS_DPRINTK("%s: querying task 0x%p\n",
372 __func__, task);
373 res = si->dft->lldd_query_task(task);
374 switch (res) {
375 case TMF_RESP_FUNC_SUCC:
376 SAS_DPRINTK("%s: task 0x%p at LU\n",
377 __func__, task);
378 return TASK_IS_AT_LU;
379 case TMF_RESP_FUNC_COMPLETE:
380 SAS_DPRINTK("%s: task 0x%p not at LU\n",
381 __func__, task);
382 return TASK_IS_NOT_AT_LU;
383 case TMF_RESP_FUNC_FAILED:
384 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
385 __func__, task);
386 return TASK_ABORT_FAILED;
387 }
388
389 }
390 }
391 return res;
392 }
393
394 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
395 {
396 int res = TMF_RESP_FUNC_FAILED;
397 struct scsi_lun lun;
398 struct sas_internal *i =
399 to_sas_internal(dev->port->ha->core.shost->transportt);
400
401 int_to_scsilun(cmd->device->lun, &lun);
402
403 SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
404 SAS_ADDR(dev->sas_addr),
405 cmd->device->lun);
406
407 if (i->dft->lldd_abort_task_set)
408 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
409
410 if (res == TMF_RESP_FUNC_FAILED) {
411 if (i->dft->lldd_clear_task_set)
412 res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
413 }
414
415 if (res == TMF_RESP_FUNC_FAILED) {
416 if (i->dft->lldd_lu_reset)
417 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
418 }
419
420 return res;
421 }
422
423 static int sas_recover_I_T(struct domain_device *dev)
424 {
425 int res = TMF_RESP_FUNC_FAILED;
426 struct sas_internal *i =
427 to_sas_internal(dev->port->ha->core.shost->transportt);
428
429 SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
430 SAS_ADDR(dev->sas_addr));
431
432 if (i->dft->lldd_I_T_nexus_reset)
433 res = i->dft->lldd_I_T_nexus_reset(dev);
434
435 return res;
436 }
437
438 /* Find the sas_phy that's attached to this device */
439 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
440 {
441 struct domain_device *pdev = dev->parent;
442 struct ex_phy *exphy = NULL;
443 int i;
444
445 /* Directly attached device */
446 if (!pdev)
447 return dev->port->phy;
448
449 /* Otherwise look in the expander */
450 for (i = 0; i < pdev->ex_dev.num_phys; i++)
451 if (!memcmp(dev->sas_addr,
452 pdev->ex_dev.ex_phy[i].attached_sas_addr,
453 SAS_ADDR_SIZE)) {
454 exphy = &pdev->ex_dev.ex_phy[i];
455 break;
456 }
457
458 BUG_ON(!exphy);
459 return exphy->phy;
460 }
461 EXPORT_SYMBOL_GPL(sas_find_local_phy);
462
463 /* Attempt to send a LUN reset message to a device */
464 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
465 {
466 struct domain_device *dev = cmd_to_domain_dev(cmd);
467 struct sas_internal *i =
468 to_sas_internal(dev->port->ha->core.shost->transportt);
469 struct scsi_lun lun;
470 int res;
471
472 int_to_scsilun(cmd->device->lun, &lun);
473
474 if (!i->dft->lldd_lu_reset)
475 return FAILED;
476
477 res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
478 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
479 return SUCCESS;
480
481 return FAILED;
482 }
483
484 /* Attempt to send a phy (bus) reset */
485 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
486 {
487 struct domain_device *dev = cmd_to_domain_dev(cmd);
488 struct sas_phy *phy = sas_find_local_phy(dev);
489 int res;
490
491 res = sas_phy_reset(phy, 1);
492 if (res)
493 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
494 kobject_name(&phy->dev.kobj),
495 res);
496 if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
497 return SUCCESS;
498
499 return FAILED;
500 }
501
502 /* Try to reset a device */
503 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
504 {
505 int res;
506 struct Scsi_Host *shost = cmd->device->host;
507
508 if (!shost->hostt->eh_device_reset_handler)
509 goto try_bus_reset;
510
511 res = shost->hostt->eh_device_reset_handler(cmd);
512 if (res == SUCCESS)
513 return res;
514
515 try_bus_reset:
516 if (shost->hostt->eh_bus_reset_handler)
517 return shost->hostt->eh_bus_reset_handler(cmd);
518
519 return FAILED;
520 }
521
522 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
523 struct list_head *work_q,
524 struct list_head *done_q)
525 {
526 struct scsi_cmnd *cmd, *n;
527 enum task_disposition res = TASK_IS_DONE;
528 int tmf_resp, need_reset;
529 struct sas_internal *i = to_sas_internal(shost->transportt);
530 unsigned long flags;
531 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
532
533 Again:
534 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
535 struct sas_task *task = TO_SAS_TASK(cmd);
536
537 if (!task)
538 continue;
539
540 list_del_init(&cmd->eh_entry);
541
542 spin_lock_irqsave(&task->task_state_lock, flags);
543 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
544 spin_unlock_irqrestore(&task->task_state_lock, flags);
545
546 if (need_reset) {
547 SAS_DPRINTK("%s: task 0x%p requests reset\n",
548 __func__, task);
549 goto reset;
550 }
551
552 SAS_DPRINTK("trying to find task 0x%p\n", task);
553 res = sas_scsi_find_task(task);
554
555 cmd->eh_eflags = 0;
556
557 switch (res) {
558 case TASK_IS_DONE:
559 SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
560 task);
561 sas_eh_finish_cmd(cmd);
562 continue;
563 case TASK_IS_ABORTED:
564 SAS_DPRINTK("%s: task 0x%p is aborted\n",
565 __func__, task);
566 sas_eh_finish_cmd(cmd);
567 continue;
568 case TASK_IS_AT_LU:
569 SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
570 reset:
571 tmf_resp = sas_recover_lu(task->dev, cmd);
572 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
573 SAS_DPRINTK("dev %016llx LU %x is "
574 "recovered\n",
575 SAS_ADDR(task->dev),
576 cmd->device->lun);
577 sas_eh_finish_cmd(cmd);
578 sas_scsi_clear_queue_lu(work_q, cmd);
579 goto Again;
580 }
581 /* fallthrough */
582 case TASK_IS_NOT_AT_LU:
583 case TASK_ABORT_FAILED:
584 SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
585 task);
586 tmf_resp = sas_recover_I_T(task->dev);
587 if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
588 struct domain_device *dev = task->dev;
589 SAS_DPRINTK("I_T %016llx recovered\n",
590 SAS_ADDR(task->dev->sas_addr));
591 sas_eh_finish_cmd(cmd);
592 sas_scsi_clear_queue_I_T(work_q, dev);
593 goto Again;
594 }
595 /* Hammer time :-) */
596 try_to_reset_cmd_device(cmd);
597 if (i->dft->lldd_clear_nexus_port) {
598 struct asd_sas_port *port = task->dev->port;
599 SAS_DPRINTK("clearing nexus for port:%d\n",
600 port->id);
601 res = i->dft->lldd_clear_nexus_port(port);
602 if (res == TMF_RESP_FUNC_COMPLETE) {
603 SAS_DPRINTK("clear nexus port:%d "
604 "succeeded\n", port->id);
605 sas_eh_finish_cmd(cmd);
606 sas_scsi_clear_queue_port(work_q,
607 port);
608 goto Again;
609 }
610 }
611 if (i->dft->lldd_clear_nexus_ha) {
612 SAS_DPRINTK("clear nexus ha\n");
613 res = i->dft->lldd_clear_nexus_ha(ha);
614 if (res == TMF_RESP_FUNC_COMPLETE) {
615 SAS_DPRINTK("clear nexus ha "
616 "succeeded\n");
617 sas_eh_finish_cmd(cmd);
618 goto clear_q;
619 }
620 }
621 /* If we are here -- this means that no amount
622 * of effort could recover from errors. Quite
623 * possibly the HA just disappeared.
624 */
625 SAS_DPRINTK("error from device %llx, LUN %x "
626 "couldn't be recovered in any way\n",
627 SAS_ADDR(task->dev->sas_addr),
628 cmd->device->lun);
629
630 sas_eh_finish_cmd(cmd);
631 goto clear_q;
632 }
633 }
634 return list_empty(work_q);
635 clear_q:
636 SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
637 list_for_each_entry_safe(cmd, n, work_q, eh_entry)
638 sas_eh_finish_cmd(cmd);
639
640 return list_empty(work_q);
641 }
642
643 void sas_scsi_recover_host(struct Scsi_Host *shost)
644 {
645 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
646 unsigned long flags;
647 LIST_HEAD(eh_work_q);
648
649 spin_lock_irqsave(shost->host_lock, flags);
650 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
651 spin_unlock_irqrestore(shost->host_lock, flags);
652
653 SAS_DPRINTK("Enter %s\n", __func__);
654 /*
655 * Deal with commands that still have SAS tasks (i.e. they didn't
656 * complete via the normal sas_task completion mechanism)
657 */
658 if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
659 goto out;
660
661 /*
662 * Now deal with SCSI commands that completed ok but have a an error
663 * code (and hopefully sense data) attached. This is roughly what
664 * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
665 * command we see here has no sas_task and is thus unknown to the HA.
666 */
667 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
668 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
669
670 out:
671 scsi_eh_flush_done_q(&ha->eh_done_q);
672 SAS_DPRINTK("--- Exit %s\n", __func__);
673 return;
674 }
675
676 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
677 {
678 struct sas_task *task = TO_SAS_TASK(cmd);
679 unsigned long flags;
680
681 if (!task) {
682 cmd->request->timeout /= 2;
683 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
684 cmd, task, (cmd->request->timeout ?
685 "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
686 if (!cmd->request->timeout)
687 return BLK_EH_NOT_HANDLED;
688 return BLK_EH_RESET_TIMER;
689 }
690
691 spin_lock_irqsave(&task->task_state_lock, flags);
692 BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
693 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
694 spin_unlock_irqrestore(&task->task_state_lock, flags);
695 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
696 "BLK_EH_HANDLED\n", cmd, task);
697 return BLK_EH_HANDLED;
698 }
699 if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
700 spin_unlock_irqrestore(&task->task_state_lock, flags);
701 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
702 "BLK_EH_RESET_TIMER\n",
703 cmd, task);
704 return BLK_EH_RESET_TIMER;
705 }
706 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
707 spin_unlock_irqrestore(&task->task_state_lock, flags);
708
709 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
710 cmd, task);
711
712 return BLK_EH_NOT_HANDLED;
713 }
714
715 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
716 {
717 struct domain_device *dev = sdev_to_domain_dev(sdev);
718
719 if (dev_is_sata(dev))
720 return ata_scsi_ioctl(sdev, cmd, arg);
721
722 return -EINVAL;
723 }
724
725 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
726 {
727 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
728 struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
729 struct domain_device *found_dev = NULL;
730 int i;
731 unsigned long flags;
732
733 spin_lock_irqsave(&ha->phy_port_lock, flags);
734 for (i = 0; i < ha->num_phys; i++) {
735 struct asd_sas_port *port = ha->sas_port[i];
736 struct domain_device *dev;
737
738 spin_lock(&port->dev_list_lock);
739 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
740 if (rphy == dev->rphy) {
741 found_dev = dev;
742 spin_unlock(&port->dev_list_lock);
743 goto found;
744 }
745 }
746 spin_unlock(&port->dev_list_lock);
747 }
748 found:
749 spin_unlock_irqrestore(&ha->phy_port_lock, flags);
750
751 return found_dev;
752 }
753
754 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
755 {
756 struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
757
758 return sas_find_dev_by_rphy(rphy);
759 }
760
761 int sas_target_alloc(struct scsi_target *starget)
762 {
763 struct domain_device *found_dev = sas_find_target(starget);
764 int res;
765
766 if (!found_dev)
767 return -ENODEV;
768
769 if (dev_is_sata(found_dev)) {
770 res = sas_ata_init_host_and_port(found_dev, starget);
771 if (res)
772 return res;
773 }
774
775 starget->hostdata = found_dev;
776 return 0;
777 }
778
779 #define SAS_DEF_QD 32
780 #define SAS_MAX_QD 64
781
782 int sas_slave_configure(struct scsi_device *scsi_dev)
783 {
784 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
785 struct sas_ha_struct *sas_ha;
786
787 BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
788
789 if (dev_is_sata(dev)) {
790 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
791 return 0;
792 }
793
794 sas_ha = dev->port->ha;
795
796 sas_read_port_mode_page(scsi_dev);
797
798 if (scsi_dev->tagged_supported) {
799 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
800 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
801 } else {
802 SAS_DPRINTK("device %llx, LUN %x doesn't support "
803 "TCQ\n", SAS_ADDR(dev->sas_addr),
804 scsi_dev->lun);
805 scsi_dev->tagged_supported = 0;
806 scsi_set_tag_type(scsi_dev, 0);
807 scsi_deactivate_tcq(scsi_dev, 1);
808 }
809
810 scsi_dev->allow_restart = 1;
811
812 return 0;
813 }
814
815 void sas_slave_destroy(struct scsi_device *scsi_dev)
816 {
817 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
818
819 if (dev_is_sata(dev))
820 ata_port_disable(dev->sata_dev.ap);
821 }
822
823 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
824 {
825 int res = min(new_depth, SAS_MAX_QD);
826
827 if (scsi_dev->tagged_supported)
828 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
829 res);
830 else {
831 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
832 sas_printk("device %llx LUN %x queue depth changed to 1\n",
833 SAS_ADDR(dev->sas_addr),
834 scsi_dev->lun);
835 scsi_adjust_queue_depth(scsi_dev, 0, 1);
836 res = 1;
837 }
838
839 return res;
840 }
841
842 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
843 {
844 if (!scsi_dev->tagged_supported)
845 return 0;
846
847 scsi_deactivate_tcq(scsi_dev, 1);
848
849 scsi_set_tag_type(scsi_dev, qt);
850 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
851
852 return qt;
853 }
854
855 int sas_bios_param(struct scsi_device *scsi_dev,
856 struct block_device *bdev,
857 sector_t capacity, int *hsc)
858 {
859 hsc[0] = 255;
860 hsc[1] = 63;
861 sector_div(capacity, 255*63);
862 hsc[2] = capacity;
863
864 return 0;
865 }
866
867 /* ---------- Task Collector Thread implementation ---------- */
868
869 static void sas_queue(struct sas_ha_struct *sas_ha)
870 {
871 struct scsi_core *core = &sas_ha->core;
872 unsigned long flags;
873 LIST_HEAD(q);
874 int can_queue;
875 int res;
876 struct sas_internal *i = to_sas_internal(core->shost->transportt);
877
878 spin_lock_irqsave(&core->task_queue_lock, flags);
879 while (!kthread_should_stop() &&
880 !list_empty(&core->task_queue)) {
881
882 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
883 if (can_queue >= 0) {
884 can_queue = core->task_queue_size;
885 list_splice_init(&core->task_queue, &q);
886 } else {
887 struct list_head *a, *n;
888
889 can_queue = sas_ha->lldd_queue_size;
890 list_for_each_safe(a, n, &core->task_queue) {
891 list_move_tail(a, &q);
892 if (--can_queue == 0)
893 break;
894 }
895 can_queue = sas_ha->lldd_queue_size;
896 }
897 core->task_queue_size -= can_queue;
898 spin_unlock_irqrestore(&core->task_queue_lock, flags);
899 {
900 struct sas_task *task = list_entry(q.next,
901 struct sas_task,
902 list);
903 list_del_init(&q);
904 res = i->dft->lldd_execute_task(task, can_queue,
905 GFP_KERNEL);
906 if (unlikely(res))
907 __list_add(&q, task->list.prev, &task->list);
908 }
909 spin_lock_irqsave(&core->task_queue_lock, flags);
910 if (res) {
911 list_splice_init(&q, &core->task_queue); /*at head*/
912 core->task_queue_size += can_queue;
913 }
914 }
915 spin_unlock_irqrestore(&core->task_queue_lock, flags);
916 }
917
918 /**
919 * sas_queue_thread -- The Task Collector thread
920 * @_sas_ha: pointer to struct sas_ha
921 */
922 static int sas_queue_thread(void *_sas_ha)
923 {
924 struct sas_ha_struct *sas_ha = _sas_ha;
925
926 while (1) {
927 set_current_state(TASK_INTERRUPTIBLE);
928 schedule();
929 sas_queue(sas_ha);
930 if (kthread_should_stop())
931 break;
932 }
933
934 return 0;
935 }
936
937 int sas_init_queue(struct sas_ha_struct *sas_ha)
938 {
939 struct scsi_core *core = &sas_ha->core;
940
941 spin_lock_init(&core->task_queue_lock);
942 core->task_queue_size = 0;
943 INIT_LIST_HEAD(&core->task_queue);
944
945 core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
946 "sas_queue_%d", core->shost->host_no);
947 if (IS_ERR(core->queue_thread))
948 return PTR_ERR(core->queue_thread);
949 return 0;
950 }
951
952 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
953 {
954 unsigned long flags;
955 struct scsi_core *core = &sas_ha->core;
956 struct sas_task *task, *n;
957
958 kthread_stop(core->queue_thread);
959
960 if (!list_empty(&core->task_queue))
961 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
962 SAS_ADDR(sas_ha->sas_addr));
963
964 spin_lock_irqsave(&core->task_queue_lock, flags);
965 list_for_each_entry_safe(task, n, &core->task_queue, list) {
966 struct scsi_cmnd *cmd = task->uldd_task;
967
968 list_del_init(&task->list);
969
970 ASSIGN_SAS_TASK(cmd, NULL);
971 sas_free_task(task);
972 cmd->result = DID_ABORT << 16;
973 cmd->scsi_done(cmd);
974 }
975 spin_unlock_irqrestore(&core->task_queue_lock, flags);
976 }
977
978 /*
979 * Call the LLDD task abort routine directly. This function is intended for
980 * use by upper layers that need to tell the LLDD to abort a task.
981 */
982 int __sas_task_abort(struct sas_task *task)
983 {
984 struct sas_internal *si =
985 to_sas_internal(task->dev->port->ha->core.shost->transportt);
986 unsigned long flags;
987 int res;
988
989 spin_lock_irqsave(&task->task_state_lock, flags);
990 if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
991 task->task_state_flags & SAS_TASK_STATE_DONE) {
992 spin_unlock_irqrestore(&task->task_state_lock, flags);
993 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
994 task);
995 return 0;
996 }
997 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
998 spin_unlock_irqrestore(&task->task_state_lock, flags);
999
1000 if (!si->dft->lldd_abort_task)
1001 return -ENODEV;
1002
1003 res = si->dft->lldd_abort_task(task);
1004
1005 spin_lock_irqsave(&task->task_state_lock, flags);
1006 if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1007 (res == TMF_RESP_FUNC_COMPLETE))
1008 {
1009 spin_unlock_irqrestore(&task->task_state_lock, flags);
1010 task->task_done(task);
1011 return 0;
1012 }
1013
1014 if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1015 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1016 spin_unlock_irqrestore(&task->task_state_lock, flags);
1017
1018 return -EAGAIN;
1019 }
1020
1021 /*
1022 * Tell an upper layer that it needs to initiate an abort for a given task.
1023 * This should only ever be called by an LLDD.
1024 */
1025 void sas_task_abort(struct sas_task *task)
1026 {
1027 struct scsi_cmnd *sc = task->uldd_task;
1028
1029 /* Escape for libsas internal commands */
1030 if (!sc) {
1031 if (!del_timer(&task->timer))
1032 return;
1033 task->timer.function(task->timer.data);
1034 return;
1035 }
1036
1037 if (dev_is_sata(task->dev)) {
1038 sas_ata_task_abort(task);
1039 return;
1040 }
1041
1042 blk_abort_request(sc->request);
1043 scsi_schedule_eh(sc->device->host);
1044 }
1045
1046 int sas_slave_alloc(struct scsi_device *scsi_dev)
1047 {
1048 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1049
1050 if (dev_is_sata(dev))
1051 return ata_sas_port_init(dev->sata_dev.ap);
1052
1053 return 0;
1054 }
1055
1056 void sas_target_destroy(struct scsi_target *starget)
1057 {
1058 struct domain_device *found_dev = sas_find_target(starget);
1059
1060 if (!found_dev)
1061 return;
1062
1063 if (dev_is_sata(found_dev))
1064 ata_sas_port_destroy(found_dev->sata_dev.ap);
1065
1066 return;
1067 }
1068
1069 static void sas_parse_addr(u8 *sas_addr, const char *p)
1070 {
1071 int i;
1072 for (i = 0; i < SAS_ADDR_SIZE; i++) {
1073 u8 h, l;
1074 if (!*p)
1075 break;
1076 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1077 p++;
1078 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1079 p++;
1080 sas_addr[i] = (h<<4) | l;
1081 }
1082 }
1083
1084 #define SAS_STRING_ADDR_SIZE 16
1085
1086 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1087 {
1088 int res;
1089 const struct firmware *fw;
1090
1091 res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1092 if (res)
1093 return res;
1094
1095 if (fw->size < SAS_STRING_ADDR_SIZE) {
1096 res = -ENODEV;
1097 goto out;
1098 }
1099
1100 sas_parse_addr(addr, fw->data);
1101
1102 out:
1103 release_firmware(fw);
1104 return res;
1105 }
1106 EXPORT_SYMBOL_GPL(sas_request_addr);
1107
1108 EXPORT_SYMBOL_GPL(sas_queuecommand);
1109 EXPORT_SYMBOL_GPL(sas_target_alloc);
1110 EXPORT_SYMBOL_GPL(sas_slave_configure);
1111 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1112 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1113 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1114 EXPORT_SYMBOL_GPL(sas_bios_param);
1115 EXPORT_SYMBOL_GPL(__sas_task_abort);
1116 EXPORT_SYMBOL_GPL(sas_task_abort);
1117 EXPORT_SYMBOL_GPL(sas_phy_reset);
1118 EXPORT_SYMBOL_GPL(sas_phy_enable);
1119 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1120 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1121 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1122 EXPORT_SYMBOL_GPL(sas_target_destroy);
1123 EXPORT_SYMBOL_GPL(sas_ioctl);
Support for the Chinese Samsung S3C2440 based development boards