2 * libata-eh.c - libata error handling
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2006 Tejun Heo <htejun@gmail.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/kernel.h>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_host.h>
38 #include <scsi/scsi_eh.h>
39 #include <scsi/scsi_device.h>
40 #include <scsi/scsi_cmnd.h>
41 #include "../scsi/scsi_transport_api.h"
43 #include <linux/libata.h>
48 ATA_EH_SPDN_NCQ_OFF
= (1 << 0),
49 ATA_EH_SPDN_SPEED_DOWN
= (1 << 1),
50 ATA_EH_SPDN_FALLBACK_TO_PIO
= (1 << 2),
53 static void __ata_port_freeze(struct ata_port
*ap
);
54 static void ata_eh_finish(struct ata_port
*ap
);
56 static void ata_eh_handle_port_suspend(struct ata_port
*ap
);
57 static void ata_eh_handle_port_resume(struct ata_port
*ap
);
58 static int ata_eh_suspend(struct ata_port
*ap
,
59 struct ata_device
**r_failed_dev
);
60 static void ata_eh_prep_resume(struct ata_port
*ap
);
61 static int ata_eh_resume(struct ata_port
*ap
, struct ata_device
**r_failed_dev
);
63 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
66 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
69 static int ata_eh_suspend(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
74 static void ata_eh_prep_resume(struct ata_port
*ap
)
77 static int ata_eh_resume(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
81 #endif /* CONFIG_PM */
83 static void ata_ering_record(struct ata_ering
*ering
, int is_io
,
84 unsigned int err_mask
)
86 struct ata_ering_entry
*ent
;
91 ering
->cursor
%= ATA_ERING_SIZE
;
93 ent
= &ering
->ring
[ering
->cursor
];
95 ent
->err_mask
= err_mask
;
96 ent
->timestamp
= get_jiffies_64();
99 static void ata_ering_clear(struct ata_ering
*ering
)
101 memset(ering
, 0, sizeof(*ering
));
104 static int ata_ering_map(struct ata_ering
*ering
,
105 int (*map_fn
)(struct ata_ering_entry
*, void *),
109 struct ata_ering_entry
*ent
;
113 ent
= &ering
->ring
[idx
];
116 rc
= map_fn(ent
, arg
);
119 idx
= (idx
- 1 + ATA_ERING_SIZE
) % ATA_ERING_SIZE
;
120 } while (idx
!= ering
->cursor
);
125 static unsigned int ata_eh_dev_action(struct ata_device
*dev
)
127 struct ata_eh_context
*ehc
= &dev
->ap
->eh_context
;
129 return ehc
->i
.action
| ehc
->i
.dev_action
[dev
->devno
];
132 static void ata_eh_clear_action(struct ata_device
*dev
,
133 struct ata_eh_info
*ehi
, unsigned int action
)
138 ehi
->action
&= ~action
;
139 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
140 ehi
->dev_action
[i
] &= ~action
;
142 /* doesn't make sense for port-wide EH actions */
143 WARN_ON(!(action
& ATA_EH_PERDEV_MASK
));
145 /* break ehi->action into ehi->dev_action */
146 if (ehi
->action
& action
) {
147 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
148 ehi
->dev_action
[i
] |= ehi
->action
& action
;
149 ehi
->action
&= ~action
;
152 /* turn off the specified per-dev action */
153 ehi
->dev_action
[dev
->devno
] &= ~action
;
158 * ata_scsi_timed_out - SCSI layer time out callback
159 * @cmd: timed out SCSI command
161 * Handles SCSI layer timeout. We race with normal completion of
162 * the qc for @cmd. If the qc is already gone, we lose and let
163 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
164 * timed out and EH should be invoked. Prevent ata_qc_complete()
165 * from finishing it by setting EH_SCHEDULED and return
168 * TODO: kill this function once old EH is gone.
171 * Called from timer context
174 * EH_HANDLED or EH_NOT_HANDLED
176 enum scsi_eh_timer_return
ata_scsi_timed_out(struct scsi_cmnd
*cmd
)
178 struct Scsi_Host
*host
= cmd
->device
->host
;
179 struct ata_port
*ap
= ata_shost_to_port(host
);
181 struct ata_queued_cmd
*qc
;
182 enum scsi_eh_timer_return ret
;
186 if (ap
->ops
->error_handler
) {
187 ret
= EH_NOT_HANDLED
;
192 spin_lock_irqsave(ap
->lock
, flags
);
193 qc
= ata_qc_from_tag(ap
, ap
->active_tag
);
195 WARN_ON(qc
->scsicmd
!= cmd
);
196 qc
->flags
|= ATA_QCFLAG_EH_SCHEDULED
;
197 qc
->err_mask
|= AC_ERR_TIMEOUT
;
198 ret
= EH_NOT_HANDLED
;
200 spin_unlock_irqrestore(ap
->lock
, flags
);
203 DPRINTK("EXIT, ret=%d\n", ret
);
208 * ata_scsi_error - SCSI layer error handler callback
209 * @host: SCSI host on which error occurred
211 * Handles SCSI-layer-thrown error events.
214 * Inherited from SCSI layer (none, can sleep)
219 void ata_scsi_error(struct Scsi_Host
*host
)
221 struct ata_port
*ap
= ata_shost_to_port(host
);
222 int i
, repeat_cnt
= ATA_EH_MAX_REPEAT
;
227 /* synchronize with port task */
228 ata_port_flush_task(ap
);
230 /* synchronize with host lock and sort out timeouts */
232 /* For new EH, all qcs are finished in one of three ways -
233 * normal completion, error completion, and SCSI timeout.
234 * Both cmpletions can race against SCSI timeout. When normal
235 * completion wins, the qc never reaches EH. When error
236 * completion wins, the qc has ATA_QCFLAG_FAILED set.
238 * When SCSI timeout wins, things are a bit more complex.
239 * Normal or error completion can occur after the timeout but
240 * before this point. In such cases, both types of
241 * completions are honored. A scmd is determined to have
242 * timed out iff its associated qc is active and not failed.
244 if (ap
->ops
->error_handler
) {
245 struct scsi_cmnd
*scmd
, *tmp
;
248 spin_lock_irqsave(ap
->lock
, flags
);
250 list_for_each_entry_safe(scmd
, tmp
, &host
->eh_cmd_q
, eh_entry
) {
251 struct ata_queued_cmd
*qc
;
253 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
254 qc
= __ata_qc_from_tag(ap
, i
);
255 if (qc
->flags
& ATA_QCFLAG_ACTIVE
&&
260 if (i
< ATA_MAX_QUEUE
) {
261 /* the scmd has an associated qc */
262 if (!(qc
->flags
& ATA_QCFLAG_FAILED
)) {
263 /* which hasn't failed yet, timeout */
264 qc
->err_mask
|= AC_ERR_TIMEOUT
;
265 qc
->flags
|= ATA_QCFLAG_FAILED
;
269 /* Normal completion occurred after
270 * SCSI timeout but before this point.
271 * Successfully complete it.
273 scmd
->retries
= scmd
->allowed
;
274 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
278 /* If we have timed out qcs. They belong to EH from
279 * this point but the state of the controller is
280 * unknown. Freeze the port to make sure the IRQ
281 * handler doesn't diddle with those qcs. This must
282 * be done atomically w.r.t. setting QCFLAG_FAILED.
285 __ata_port_freeze(ap
);
287 spin_unlock_irqrestore(ap
->lock
, flags
);
289 spin_unlock_wait(ap
->lock
);
292 /* invoke error handler */
293 if (ap
->ops
->error_handler
) {
294 /* process port resume request */
295 ata_eh_handle_port_resume(ap
);
297 /* fetch & clear EH info */
298 spin_lock_irqsave(ap
->lock
, flags
);
300 memset(&ap
->eh_context
, 0, sizeof(ap
->eh_context
));
301 ap
->eh_context
.i
= ap
->eh_info
;
302 memset(&ap
->eh_info
, 0, sizeof(ap
->eh_info
));
304 ap
->pflags
|= ATA_PFLAG_EH_IN_PROGRESS
;
305 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
307 spin_unlock_irqrestore(ap
->lock
, flags
);
309 /* invoke EH, skip if unloading or suspended */
310 if (!(ap
->pflags
& (ATA_PFLAG_UNLOADING
| ATA_PFLAG_SUSPENDED
)))
311 ap
->ops
->error_handler(ap
);
315 /* process port suspend request */
316 ata_eh_handle_port_suspend(ap
);
318 /* Exception might have happend after ->error_handler
319 * recovered the port but before this point. Repeat
322 spin_lock_irqsave(ap
->lock
, flags
);
324 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
) {
326 ata_port_printk(ap
, KERN_INFO
,
327 "EH pending after completion, "
328 "repeating EH (cnt=%d)\n", repeat_cnt
);
329 spin_unlock_irqrestore(ap
->lock
, flags
);
332 ata_port_printk(ap
, KERN_ERR
, "EH pending after %d "
333 "tries, giving up\n", ATA_EH_MAX_REPEAT
);
336 /* this run is complete, make sure EH info is clear */
337 memset(&ap
->eh_info
, 0, sizeof(ap
->eh_info
));
339 /* Clear host_eh_scheduled while holding ap->lock such
340 * that if exception occurs after this point but
341 * before EH completion, SCSI midlayer will
344 host
->host_eh_scheduled
= 0;
346 spin_unlock_irqrestore(ap
->lock
, flags
);
348 WARN_ON(ata_qc_from_tag(ap
, ap
->active_tag
) == NULL
);
349 ap
->ops
->eng_timeout(ap
);
352 /* finish or retry handled scmd's and clean up */
353 WARN_ON(host
->host_failed
|| !list_empty(&host
->eh_cmd_q
));
355 scsi_eh_flush_done_q(&ap
->eh_done_q
);
358 spin_lock_irqsave(ap
->lock
, flags
);
360 if (ap
->pflags
& ATA_PFLAG_LOADING
)
361 ap
->pflags
&= ~ATA_PFLAG_LOADING
;
362 else if (ap
->pflags
& ATA_PFLAG_SCSI_HOTPLUG
)
363 queue_delayed_work(ata_aux_wq
, &ap
->hotplug_task
, 0);
365 if (ap
->pflags
& ATA_PFLAG_RECOVERED
)
366 ata_port_printk(ap
, KERN_INFO
, "EH complete\n");
368 ap
->pflags
&= ~(ATA_PFLAG_SCSI_HOTPLUG
| ATA_PFLAG_RECOVERED
);
370 /* tell wait_eh that we're done */
371 ap
->pflags
&= ~ATA_PFLAG_EH_IN_PROGRESS
;
372 wake_up_all(&ap
->eh_wait_q
);
374 spin_unlock_irqrestore(ap
->lock
, flags
);
380 * ata_port_wait_eh - Wait for the currently pending EH to complete
381 * @ap: Port to wait EH for
383 * Wait until the currently pending EH is complete.
386 * Kernel thread context (may sleep).
388 void ata_port_wait_eh(struct ata_port
*ap
)
394 spin_lock_irqsave(ap
->lock
, flags
);
396 while (ap
->pflags
& (ATA_PFLAG_EH_PENDING
| ATA_PFLAG_EH_IN_PROGRESS
)) {
397 prepare_to_wait(&ap
->eh_wait_q
, &wait
, TASK_UNINTERRUPTIBLE
);
398 spin_unlock_irqrestore(ap
->lock
, flags
);
400 spin_lock_irqsave(ap
->lock
, flags
);
402 finish_wait(&ap
->eh_wait_q
, &wait
);
404 spin_unlock_irqrestore(ap
->lock
, flags
);
406 /* make sure SCSI EH is complete */
407 if (scsi_host_in_recovery(ap
->scsi_host
)) {
414 * ata_qc_timeout - Handle timeout of queued command
415 * @qc: Command that timed out
417 * Some part of the kernel (currently, only the SCSI layer)
418 * has noticed that the active command on port @ap has not
419 * completed after a specified length of time. Handle this
420 * condition by disabling DMA (if necessary) and completing
421 * transactions, with error if necessary.
423 * This also handles the case of the "lost interrupt", where
424 * for some reason (possibly hardware bug, possibly driver bug)
425 * an interrupt was not delivered to the driver, even though the
426 * transaction completed successfully.
428 * TODO: kill this function once old EH is gone.
431 * Inherited from SCSI layer (none, can sleep)
433 static void ata_qc_timeout(struct ata_queued_cmd
*qc
)
435 struct ata_port
*ap
= qc
->ap
;
436 u8 host_stat
= 0, drv_stat
;
441 ap
->hsm_task_state
= HSM_ST_IDLE
;
443 spin_lock_irqsave(ap
->lock
, flags
);
445 switch (qc
->tf
.protocol
) {
448 case ATA_PROT_ATAPI_DMA
:
449 host_stat
= ap
->ops
->bmdma_status(ap
);
451 /* before we do anything else, clear DMA-Start bit */
452 ap
->ops
->bmdma_stop(qc
);
458 drv_stat
= ata_chk_status(ap
);
460 /* ack bmdma irq events */
461 ap
->ops
->irq_clear(ap
);
463 ata_dev_printk(qc
->dev
, KERN_ERR
, "command 0x%x timeout, "
464 "stat 0x%x host_stat 0x%x\n",
465 qc
->tf
.command
, drv_stat
, host_stat
);
467 /* complete taskfile transaction */
468 qc
->err_mask
|= AC_ERR_TIMEOUT
;
472 spin_unlock_irqrestore(ap
->lock
, flags
);
474 ata_eh_qc_complete(qc
);
480 * ata_eng_timeout - Handle timeout of queued command
481 * @ap: Port on which timed-out command is active
483 * Some part of the kernel (currently, only the SCSI layer)
484 * has noticed that the active command on port @ap has not
485 * completed after a specified length of time. Handle this
486 * condition by disabling DMA (if necessary) and completing
487 * transactions, with error if necessary.
489 * This also handles the case of the "lost interrupt", where
490 * for some reason (possibly hardware bug, possibly driver bug)
491 * an interrupt was not delivered to the driver, even though the
492 * transaction completed successfully.
494 * TODO: kill this function once old EH is gone.
497 * Inherited from SCSI layer (none, can sleep)
499 void ata_eng_timeout(struct ata_port
*ap
)
503 ata_qc_timeout(ata_qc_from_tag(ap
, ap
->active_tag
));
509 * ata_qc_schedule_eh - schedule qc for error handling
510 * @qc: command to schedule error handling for
512 * Schedule error handling for @qc. EH will kick in as soon as
513 * other commands are drained.
516 * spin_lock_irqsave(host lock)
518 void ata_qc_schedule_eh(struct ata_queued_cmd
*qc
)
520 struct ata_port
*ap
= qc
->ap
;
522 WARN_ON(!ap
->ops
->error_handler
);
524 qc
->flags
|= ATA_QCFLAG_FAILED
;
525 qc
->ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
527 /* The following will fail if timeout has already expired.
528 * ata_scsi_error() takes care of such scmds on EH entry.
529 * Note that ATA_QCFLAG_FAILED is unconditionally set after
530 * this function completes.
532 scsi_req_abort_cmd(qc
->scsicmd
);
536 * ata_port_schedule_eh - schedule error handling without a qc
537 * @ap: ATA port to schedule EH for
539 * Schedule error handling for @ap. EH will kick in as soon as
540 * all commands are drained.
543 * spin_lock_irqsave(host lock)
545 void ata_port_schedule_eh(struct ata_port
*ap
)
547 WARN_ON(!ap
->ops
->error_handler
);
549 ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
550 scsi_schedule_eh(ap
->scsi_host
);
552 DPRINTK("port EH scheduled\n");
556 * ata_port_abort - abort all qc's on the port
557 * @ap: ATA port to abort qc's for
559 * Abort all active qc's of @ap and schedule EH.
562 * spin_lock_irqsave(host lock)
565 * Number of aborted qc's.
567 int ata_port_abort(struct ata_port
*ap
)
569 int tag
, nr_aborted
= 0;
571 WARN_ON(!ap
->ops
->error_handler
);
573 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
574 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
577 qc
->flags
|= ATA_QCFLAG_FAILED
;
584 ata_port_schedule_eh(ap
);
590 * __ata_port_freeze - freeze port
591 * @ap: ATA port to freeze
593 * This function is called when HSM violation or some other
594 * condition disrupts normal operation of the port. Frozen port
595 * is not allowed to perform any operation until the port is
596 * thawed, which usually follows a successful reset.
598 * ap->ops->freeze() callback can be used for freezing the port
599 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
600 * port cannot be frozen hardware-wise, the interrupt handler
601 * must ack and clear interrupts unconditionally while the port
605 * spin_lock_irqsave(host lock)
607 static void __ata_port_freeze(struct ata_port
*ap
)
609 WARN_ON(!ap
->ops
->error_handler
);
614 ap
->pflags
|= ATA_PFLAG_FROZEN
;
616 DPRINTK("ata%u port frozen\n", ap
->print_id
);
620 * ata_port_freeze - abort & freeze port
621 * @ap: ATA port to freeze
623 * Abort and freeze @ap.
626 * spin_lock_irqsave(host lock)
629 * Number of aborted commands.
631 int ata_port_freeze(struct ata_port
*ap
)
635 WARN_ON(!ap
->ops
->error_handler
);
637 nr_aborted
= ata_port_abort(ap
);
638 __ata_port_freeze(ap
);
644 * ata_eh_freeze_port - EH helper to freeze port
645 * @ap: ATA port to freeze
652 void ata_eh_freeze_port(struct ata_port
*ap
)
656 if (!ap
->ops
->error_handler
)
659 spin_lock_irqsave(ap
->lock
, flags
);
660 __ata_port_freeze(ap
);
661 spin_unlock_irqrestore(ap
->lock
, flags
);
665 * ata_port_thaw_port - EH helper to thaw port
666 * @ap: ATA port to thaw
668 * Thaw frozen port @ap.
673 void ata_eh_thaw_port(struct ata_port
*ap
)
677 if (!ap
->ops
->error_handler
)
680 spin_lock_irqsave(ap
->lock
, flags
);
682 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
687 spin_unlock_irqrestore(ap
->lock
, flags
);
689 DPRINTK("ata%u port thawed\n", ap
->print_id
);
692 static void ata_eh_scsidone(struct scsi_cmnd
*scmd
)
697 static void __ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
699 struct ata_port
*ap
= qc
->ap
;
700 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
703 spin_lock_irqsave(ap
->lock
, flags
);
704 qc
->scsidone
= ata_eh_scsidone
;
705 __ata_qc_complete(qc
);
706 WARN_ON(ata_tag_valid(qc
->tag
));
707 spin_unlock_irqrestore(ap
->lock
, flags
);
709 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
713 * ata_eh_qc_complete - Complete an active ATA command from EH
714 * @qc: Command to complete
716 * Indicate to the mid and upper layers that an ATA command has
717 * completed. To be used from EH.
719 void ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
721 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
722 scmd
->retries
= scmd
->allowed
;
723 __ata_eh_qc_complete(qc
);
727 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
728 * @qc: Command to retry
730 * Indicate to the mid and upper layers that an ATA command
731 * should be retried. To be used from EH.
733 * SCSI midlayer limits the number of retries to scmd->allowed.
734 * scmd->retries is decremented for commands which get retried
735 * due to unrelated failures (qc->err_mask is zero).
737 void ata_eh_qc_retry(struct ata_queued_cmd
*qc
)
739 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
740 if (!qc
->err_mask
&& scmd
->retries
)
742 __ata_eh_qc_complete(qc
);
746 * ata_eh_detach_dev - detach ATA device
747 * @dev: ATA device to detach
754 static void ata_eh_detach_dev(struct ata_device
*dev
)
756 struct ata_port
*ap
= dev
->ap
;
759 ata_dev_disable(dev
);
761 spin_lock_irqsave(ap
->lock
, flags
);
763 dev
->flags
&= ~ATA_DFLAG_DETACH
;
765 if (ata_scsi_offline_dev(dev
)) {
766 dev
->flags
|= ATA_DFLAG_DETACHED
;
767 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
770 /* clear per-dev EH actions */
771 ata_eh_clear_action(dev
, &ap
->eh_info
, ATA_EH_PERDEV_MASK
);
772 ata_eh_clear_action(dev
, &ap
->eh_context
.i
, ATA_EH_PERDEV_MASK
);
774 spin_unlock_irqrestore(ap
->lock
, flags
);
778 * ata_eh_about_to_do - about to perform eh_action
779 * @ap: target ATA port
780 * @dev: target ATA dev for per-dev action (can be NULL)
781 * @action: action about to be performed
783 * Called just before performing EH actions to clear related bits
784 * in @ap->eh_info such that eh actions are not unnecessarily
790 static void ata_eh_about_to_do(struct ata_port
*ap
, struct ata_device
*dev
,
794 struct ata_eh_info
*ehi
= &ap
->eh_info
;
795 struct ata_eh_context
*ehc
= &ap
->eh_context
;
797 spin_lock_irqsave(ap
->lock
, flags
);
799 /* Reset is represented by combination of actions and EHI
800 * flags. Suck in all related bits before clearing eh_info to
801 * avoid losing requested action.
803 if (action
& ATA_EH_RESET_MASK
) {
804 ehc
->i
.action
|= ehi
->action
& ATA_EH_RESET_MASK
;
805 ehc
->i
.flags
|= ehi
->flags
& ATA_EHI_RESET_MODIFIER_MASK
;
807 /* make sure all reset actions are cleared & clear EHI flags */
808 action
|= ATA_EH_RESET_MASK
;
809 ehi
->flags
&= ~ATA_EHI_RESET_MODIFIER_MASK
;
812 ata_eh_clear_action(dev
, ehi
, action
);
814 if (!(ehc
->i
.flags
& ATA_EHI_QUIET
))
815 ap
->pflags
|= ATA_PFLAG_RECOVERED
;
817 spin_unlock_irqrestore(ap
->lock
, flags
);
821 * ata_eh_done - EH action complete
822 * @ap: target ATA port
823 * @dev: target ATA dev for per-dev action (can be NULL)
824 * @action: action just completed
826 * Called right after performing EH actions to clear related bits
827 * in @ap->eh_context.
832 static void ata_eh_done(struct ata_port
*ap
, struct ata_device
*dev
,
835 /* if reset is complete, clear all reset actions & reset modifier */
836 if (action
& ATA_EH_RESET_MASK
) {
837 action
|= ATA_EH_RESET_MASK
;
838 ap
->eh_context
.i
.flags
&= ~ATA_EHI_RESET_MODIFIER_MASK
;
841 ata_eh_clear_action(dev
, &ap
->eh_context
.i
, action
);
845 * ata_err_string - convert err_mask to descriptive string
846 * @err_mask: error mask to convert to string
848 * Convert @err_mask to descriptive string. Errors are
849 * prioritized according to severity and only the most severe
856 * Descriptive string for @err_mask
858 static const char * ata_err_string(unsigned int err_mask
)
860 if (err_mask
& AC_ERR_HOST_BUS
)
861 return "host bus error";
862 if (err_mask
& AC_ERR_ATA_BUS
)
863 return "ATA bus error";
864 if (err_mask
& AC_ERR_TIMEOUT
)
866 if (err_mask
& AC_ERR_HSM
)
867 return "HSM violation";
868 if (err_mask
& AC_ERR_SYSTEM
)
869 return "internal error";
870 if (err_mask
& AC_ERR_MEDIA
)
871 return "media error";
872 if (err_mask
& AC_ERR_INVALID
)
873 return "invalid argument";
874 if (err_mask
& AC_ERR_DEV
)
875 return "device error";
876 return "unknown error";
880 * ata_read_log_page - read a specific log page
881 * @dev: target device
882 * @page: page to read
883 * @buf: buffer to store read page
884 * @sectors: number of sectors to read
886 * Read log page using READ_LOG_EXT command.
889 * Kernel thread context (may sleep).
892 * 0 on success, AC_ERR_* mask otherwise.
894 static unsigned int ata_read_log_page(struct ata_device
*dev
,
895 u8 page
, void *buf
, unsigned int sectors
)
897 struct ata_taskfile tf
;
898 unsigned int err_mask
;
900 DPRINTK("read log page - page %d\n", page
);
902 ata_tf_init(dev
, &tf
);
903 tf
.command
= ATA_CMD_READ_LOG_EXT
;
906 tf
.hob_nsect
= sectors
>> 8;
907 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA48
| ATA_TFLAG_DEVICE
;
908 tf
.protocol
= ATA_PROT_PIO
;
910 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
911 buf
, sectors
* ATA_SECT_SIZE
);
913 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
918 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
919 * @dev: Device to read log page 10h from
920 * @tag: Resulting tag of the failed command
921 * @tf: Resulting taskfile registers of the failed command
923 * Read log page 10h to obtain NCQ error details and clear error
927 * Kernel thread context (may sleep).
930 * 0 on success, -errno otherwise.
932 static int ata_eh_read_log_10h(struct ata_device
*dev
,
933 int *tag
, struct ata_taskfile
*tf
)
935 u8
*buf
= dev
->ap
->sector_buf
;
936 unsigned int err_mask
;
940 err_mask
= ata_read_log_page(dev
, ATA_LOG_SATA_NCQ
, buf
, 1);
945 for (i
= 0; i
< ATA_SECT_SIZE
; i
++)
948 ata_dev_printk(dev
, KERN_WARNING
,
949 "invalid checksum 0x%x on log page 10h\n", csum
);
954 *tag
= buf
[0] & 0x1f;
956 tf
->command
= buf
[2];
957 tf
->feature
= buf
[3];
962 tf
->hob_lbal
= buf
[8];
963 tf
->hob_lbam
= buf
[9];
964 tf
->hob_lbah
= buf
[10];
966 tf
->hob_nsect
= buf
[13];
972 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
973 * @dev: device to perform REQUEST_SENSE to
974 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
976 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
977 * SENSE. This function is EH helper.
980 * Kernel thread context (may sleep).
983 * 0 on success, AC_ERR_* mask on failure
985 static unsigned int atapi_eh_request_sense(struct ata_device
*dev
,
986 unsigned char *sense_buf
)
988 struct ata_port
*ap
= dev
->ap
;
989 struct ata_taskfile tf
;
990 u8 cdb
[ATAPI_CDB_LEN
];
992 DPRINTK("ATAPI request sense\n");
994 ata_tf_init(dev
, &tf
);
996 /* FIXME: is this needed? */
997 memset(sense_buf
, 0, SCSI_SENSE_BUFFERSIZE
);
999 /* XXX: why tf_read here? */
1000 ap
->ops
->tf_read(ap
, &tf
);
1002 /* fill these in, for the case where they are -not- overwritten */
1003 sense_buf
[0] = 0x70;
1004 sense_buf
[2] = tf
.feature
>> 4;
1006 memset(cdb
, 0, ATAPI_CDB_LEN
);
1007 cdb
[0] = REQUEST_SENSE
;
1008 cdb
[4] = SCSI_SENSE_BUFFERSIZE
;
1010 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1011 tf
.command
= ATA_CMD_PACKET
;
1013 /* is it pointless to prefer PIO for "safety reasons"? */
1014 if (ap
->flags
& ATA_FLAG_PIO_DMA
) {
1015 tf
.protocol
= ATA_PROT_ATAPI_DMA
;
1016 tf
.feature
|= ATAPI_PKT_DMA
;
1018 tf
.protocol
= ATA_PROT_ATAPI
;
1019 tf
.lbam
= (8 * 1024) & 0xff;
1020 tf
.lbah
= (8 * 1024) >> 8;
1023 return ata_exec_internal(dev
, &tf
, cdb
, DMA_FROM_DEVICE
,
1024 sense_buf
, SCSI_SENSE_BUFFERSIZE
);
1028 * ata_eh_analyze_serror - analyze SError for a failed port
1029 * @ap: ATA port to analyze SError for
1031 * Analyze SError if available and further determine cause of
1037 static void ata_eh_analyze_serror(struct ata_port
*ap
)
1039 struct ata_eh_context
*ehc
= &ap
->eh_context
;
1040 u32 serror
= ehc
->i
.serror
;
1041 unsigned int err_mask
= 0, action
= 0;
1043 if (serror
& SERR_PERSISTENT
) {
1044 err_mask
|= AC_ERR_ATA_BUS
;
1045 action
|= ATA_EH_HARDRESET
;
1048 (SERR_DATA_RECOVERED
| SERR_COMM_RECOVERED
| SERR_DATA
)) {
1049 err_mask
|= AC_ERR_ATA_BUS
;
1050 action
|= ATA_EH_SOFTRESET
;
1052 if (serror
& SERR_PROTOCOL
) {
1053 err_mask
|= AC_ERR_HSM
;
1054 action
|= ATA_EH_SOFTRESET
;
1056 if (serror
& SERR_INTERNAL
) {
1057 err_mask
|= AC_ERR_SYSTEM
;
1058 action
|= ATA_EH_SOFTRESET
;
1060 if (serror
& (SERR_PHYRDY_CHG
| SERR_DEV_XCHG
))
1061 ata_ehi_hotplugged(&ehc
->i
);
1063 ehc
->i
.err_mask
|= err_mask
;
1064 ehc
->i
.action
|= action
;
1068 * ata_eh_analyze_ncq_error - analyze NCQ error
1069 * @ap: ATA port to analyze NCQ error for
1071 * Read log page 10h, determine the offending qc and acquire
1072 * error status TF. For NCQ device errors, all LLDDs have to do
1073 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1077 * Kernel thread context (may sleep).
1079 static void ata_eh_analyze_ncq_error(struct ata_port
*ap
)
1081 struct ata_eh_context
*ehc
= &ap
->eh_context
;
1082 struct ata_device
*dev
= ap
->device
;
1083 struct ata_queued_cmd
*qc
;
1084 struct ata_taskfile tf
;
1087 /* if frozen, we can't do much */
1088 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1091 /* is it NCQ device error? */
1092 if (!ap
->sactive
|| !(ehc
->i
.err_mask
& AC_ERR_DEV
))
1095 /* has LLDD analyzed already? */
1096 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1097 qc
= __ata_qc_from_tag(ap
, tag
);
1099 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1106 /* okay, this error is ours */
1107 rc
= ata_eh_read_log_10h(dev
, &tag
, &tf
);
1109 ata_port_printk(ap
, KERN_ERR
, "failed to read log page 10h "
1110 "(errno=%d)\n", rc
);
1114 if (!(ap
->sactive
& (1 << tag
))) {
1115 ata_port_printk(ap
, KERN_ERR
, "log page 10h reported "
1116 "inactive tag %d\n", tag
);
1120 /* we've got the perpetrator, condemn it */
1121 qc
= __ata_qc_from_tag(ap
, tag
);
1122 memcpy(&qc
->result_tf
, &tf
, sizeof(tf
));
1123 qc
->err_mask
|= AC_ERR_DEV
;
1124 ehc
->i
.err_mask
&= ~AC_ERR_DEV
;
1128 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1129 * @qc: qc to analyze
1130 * @tf: Taskfile registers to analyze
1132 * Analyze taskfile of @qc and further determine cause of
1133 * failure. This function also requests ATAPI sense data if
1137 * Kernel thread context (may sleep).
1140 * Determined recovery action
1142 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd
*qc
,
1143 const struct ata_taskfile
*tf
)
1145 unsigned int tmp
, action
= 0;
1146 u8 stat
= tf
->command
, err
= tf
->feature
;
1148 if ((stat
& (ATA_BUSY
| ATA_DRQ
| ATA_DRDY
)) != ATA_DRDY
) {
1149 qc
->err_mask
|= AC_ERR_HSM
;
1150 return ATA_EH_SOFTRESET
;
1153 if (!(qc
->err_mask
& AC_ERR_DEV
))
1156 switch (qc
->dev
->class) {
1159 qc
->err_mask
|= AC_ERR_ATA_BUS
;
1161 qc
->err_mask
|= AC_ERR_MEDIA
;
1163 qc
->err_mask
|= AC_ERR_INVALID
;
1167 if (!(qc
->ap
->pflags
& ATA_PFLAG_FROZEN
)) {
1168 tmp
= atapi_eh_request_sense(qc
->dev
,
1169 qc
->scsicmd
->sense_buffer
);
1171 /* ATA_QCFLAG_SENSE_VALID is used to
1172 * tell atapi_qc_complete() that sense
1173 * data is already valid.
1175 * TODO: interpret sense data and set
1176 * appropriate err_mask.
1178 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1180 qc
->err_mask
|= tmp
;
1184 if (qc
->err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
| AC_ERR_ATA_BUS
))
1185 action
|= ATA_EH_SOFTRESET
;
1190 static int ata_eh_categorize_error(int is_io
, unsigned int err_mask
)
1192 if (err_mask
& AC_ERR_ATA_BUS
)
1195 if (err_mask
& AC_ERR_TIMEOUT
)
1199 if (err_mask
& AC_ERR_HSM
)
1202 (AC_ERR_DEV
|AC_ERR_MEDIA
|AC_ERR_INVALID
)) == AC_ERR_DEV
)
1209 struct speed_down_verdict_arg
{
1214 static int speed_down_verdict_cb(struct ata_ering_entry
*ent
, void *void_arg
)
1216 struct speed_down_verdict_arg
*arg
= void_arg
;
1217 int cat
= ata_eh_categorize_error(ent
->is_io
, ent
->err_mask
);
1219 if (ent
->timestamp
< arg
->since
)
1222 arg
->nr_errors
[cat
]++;
1227 * ata_eh_speed_down_verdict - Determine speed down verdict
1228 * @dev: Device of interest
1230 * This function examines error ring of @dev and determines
1231 * whether NCQ needs to be turned off, transfer speed should be
1232 * stepped down, or falling back to PIO is necessary.
1234 * Cat-1 is ATA_BUS error for any command.
1236 * Cat-2 is TIMEOUT for any command or HSM violation for known
1237 * supported commands.
1239 * Cat-3 is is unclassified DEV error for known supported
1242 * NCQ needs to be turned off if there have been more than 3
1243 * Cat-2 + Cat-3 errors during last 10 minutes.
1245 * Speed down is necessary if there have been more than 3 Cat-1 +
1246 * Cat-2 errors or 10 Cat-3 errors during last 10 minutes.
1248 * Falling back to PIO mode is necessary if there have been more
1249 * than 10 Cat-1 + Cat-2 + Cat-3 errors during last 5 minutes.
1252 * Inherited from caller.
1255 * OR of ATA_EH_SPDN_* flags.
1257 static unsigned int ata_eh_speed_down_verdict(struct ata_device
*dev
)
1259 const u64 j5mins
= 5LLU * 60 * HZ
, j10mins
= 10LLU * 60 * HZ
;
1260 u64 j64
= get_jiffies_64();
1261 struct speed_down_verdict_arg arg
;
1262 unsigned int verdict
= 0;
1264 /* scan past 10 mins of error history */
1265 memset(&arg
, 0, sizeof(arg
));
1266 arg
.since
= j64
- min(j64
, j10mins
);
1267 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1269 if (arg
.nr_errors
[2] + arg
.nr_errors
[3] > 3)
1270 verdict
|= ATA_EH_SPDN_NCQ_OFF
;
1271 if (arg
.nr_errors
[1] + arg
.nr_errors
[2] > 3 || arg
.nr_errors
[3] > 10)
1272 verdict
|= ATA_EH_SPDN_SPEED_DOWN
;
1274 /* scan past 3 mins of error history */
1275 memset(&arg
, 0, sizeof(arg
));
1276 arg
.since
= j64
- min(j64
, j5mins
);
1277 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1279 if (arg
.nr_errors
[1] + arg
.nr_errors
[2] + arg
.nr_errors
[3] > 10)
1280 verdict
|= ATA_EH_SPDN_FALLBACK_TO_PIO
;
1286 * ata_eh_speed_down - record error and speed down if necessary
1287 * @dev: Failed device
1288 * @is_io: Did the device fail during normal IO?
1289 * @err_mask: err_mask of the error
1291 * Record error and examine error history to determine whether
1292 * adjusting transmission speed is necessary. It also sets
1293 * transmission limits appropriately if such adjustment is
1297 * Kernel thread context (may sleep).
1300 * Determined recovery action.
1302 static unsigned int ata_eh_speed_down(struct ata_device
*dev
, int is_io
,
1303 unsigned int err_mask
)
1305 unsigned int verdict
;
1306 unsigned int action
= 0;
1308 /* don't bother if Cat-0 error */
1309 if (ata_eh_categorize_error(is_io
, err_mask
) == 0)
1312 /* record error and determine whether speed down is necessary */
1313 ata_ering_record(&dev
->ering
, is_io
, err_mask
);
1314 verdict
= ata_eh_speed_down_verdict(dev
);
1317 if ((verdict
& ATA_EH_SPDN_NCQ_OFF
) &&
1318 (dev
->flags
& (ATA_DFLAG_PIO
| ATA_DFLAG_NCQ
|
1319 ATA_DFLAG_NCQ_OFF
)) == ATA_DFLAG_NCQ
) {
1320 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
1321 ata_dev_printk(dev
, KERN_WARNING
,
1322 "NCQ disabled due to excessive errors\n");
1327 if (verdict
& ATA_EH_SPDN_SPEED_DOWN
) {
1328 /* speed down SATA link speed if possible */
1329 if (sata_down_spd_limit(dev
->ap
) == 0) {
1330 action
|= ATA_EH_HARDRESET
;
1334 /* lower transfer mode */
1335 if (dev
->spdn_cnt
< 2) {
1336 static const int dma_dnxfer_sel
[] =
1337 { ATA_DNXFER_DMA
, ATA_DNXFER_40C
};
1338 static const int pio_dnxfer_sel
[] =
1339 { ATA_DNXFER_PIO
, ATA_DNXFER_FORCE_PIO0
};
1342 if (dev
->xfer_shift
!= ATA_SHIFT_PIO
)
1343 sel
= dma_dnxfer_sel
[dev
->spdn_cnt
];
1345 sel
= pio_dnxfer_sel
[dev
->spdn_cnt
];
1349 if (ata_down_xfermask_limit(dev
, sel
) == 0) {
1350 action
|= ATA_EH_SOFTRESET
;
1356 /* Fall back to PIO? Slowing down to PIO is meaningless for
1357 * SATA. Consider it only for PATA.
1359 if ((verdict
& ATA_EH_SPDN_FALLBACK_TO_PIO
) && (dev
->spdn_cnt
>= 2) &&
1360 (dev
->ap
->cbl
!= ATA_CBL_SATA
) &&
1361 (dev
->xfer_shift
!= ATA_SHIFT_PIO
)) {
1362 if (ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO
) == 0) {
1364 action
|= ATA_EH_SOFTRESET
;
1371 /* device has been slowed down, blow error history */
1372 ata_ering_clear(&dev
->ering
);
1377 * ata_eh_autopsy - analyze error and determine recovery action
1378 * @ap: ATA port to perform autopsy on
1380 * Analyze why @ap failed and determine which recovery action is
1381 * needed. This function also sets more detailed AC_ERR_* values
1382 * and fills sense data for ATAPI CHECK SENSE.
1385 * Kernel thread context (may sleep).
1387 static void ata_eh_autopsy(struct ata_port
*ap
)
1389 struct ata_eh_context
*ehc
= &ap
->eh_context
;
1390 unsigned int all_err_mask
= 0;
1397 if (ehc
->i
.flags
& ATA_EHI_NO_AUTOPSY
)
1400 /* obtain and analyze SError */
1401 rc
= sata_scr_read(ap
, SCR_ERROR
, &serror
);
1403 ehc
->i
.serror
|= serror
;
1404 ata_eh_analyze_serror(ap
);
1405 } else if (rc
!= -EOPNOTSUPP
)
1406 ehc
->i
.action
|= ATA_EH_HARDRESET
;
1408 /* analyze NCQ failure */
1409 ata_eh_analyze_ncq_error(ap
);
1411 /* any real error trumps AC_ERR_OTHER */
1412 if (ehc
->i
.err_mask
& ~AC_ERR_OTHER
)
1413 ehc
->i
.err_mask
&= ~AC_ERR_OTHER
;
1415 all_err_mask
|= ehc
->i
.err_mask
;
1417 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1418 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
1420 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1423 /* inherit upper level err_mask */
1424 qc
->err_mask
|= ehc
->i
.err_mask
;
1427 ehc
->i
.action
|= ata_eh_analyze_tf(qc
, &qc
->result_tf
);
1429 /* DEV errors are probably spurious in case of ATA_BUS error */
1430 if (qc
->err_mask
& AC_ERR_ATA_BUS
)
1431 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_MEDIA
|
1434 /* any real error trumps unknown error */
1435 if (qc
->err_mask
& ~AC_ERR_OTHER
)
1436 qc
->err_mask
&= ~AC_ERR_OTHER
;
1438 /* SENSE_VALID trumps dev/unknown error and revalidation */
1439 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
1440 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_OTHER
);
1441 ehc
->i
.action
&= ~ATA_EH_REVALIDATE
;
1444 /* accumulate error info */
1445 ehc
->i
.dev
= qc
->dev
;
1446 all_err_mask
|= qc
->err_mask
;
1447 if (qc
->flags
& ATA_QCFLAG_IO
)
1451 /* enforce default EH actions */
1452 if (ap
->pflags
& ATA_PFLAG_FROZEN
||
1453 all_err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
))
1454 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
1455 else if (all_err_mask
)
1456 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
1458 /* if we have offending qcs and the associated failed device */
1461 ehc
->i
.action
|= ata_eh_speed_down(ehc
->i
.dev
, is_io
,
1464 /* perform per-dev EH action only on the offending device */
1465 ehc
->i
.dev_action
[ehc
->i
.dev
->devno
] |=
1466 ehc
->i
.action
& ATA_EH_PERDEV_MASK
;
1467 ehc
->i
.action
&= ~ATA_EH_PERDEV_MASK
;
1474 * ata_eh_report - report error handling to user
1475 * @ap: ATA port EH is going on
1477 * Report EH to user.
1482 static void ata_eh_report(struct ata_port
*ap
)
1484 struct ata_eh_context
*ehc
= &ap
->eh_context
;
1485 const char *frozen
, *desc
;
1486 int tag
, nr_failed
= 0;
1489 if (ehc
->i
.desc
[0] != '\0')
1492 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1493 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
1495 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1497 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
&& !qc
->err_mask
)
1503 if (!nr_failed
&& !ehc
->i
.err_mask
)
1507 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1511 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "exception Emask 0x%x "
1512 "SAct 0x%x SErr 0x%x action 0x%x%s\n",
1513 ehc
->i
.err_mask
, ap
->sactive
, ehc
->i
.serror
,
1514 ehc
->i
.action
, frozen
);
1516 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "(%s)\n", desc
);
1518 ata_port_printk(ap
, KERN_ERR
, "exception Emask 0x%x "
1519 "SAct 0x%x SErr 0x%x action 0x%x%s\n",
1520 ehc
->i
.err_mask
, ap
->sactive
, ehc
->i
.serror
,
1521 ehc
->i
.action
, frozen
);
1523 ata_port_printk(ap
, KERN_ERR
, "(%s)\n", desc
);
1526 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1527 static const char *dma_str
[] = {
1528 [DMA_BIDIRECTIONAL
] = "bidi",
1529 [DMA_TO_DEVICE
] = "out",
1530 [DMA_FROM_DEVICE
] = "in",
1533 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
1534 struct ata_taskfile
*cmd
= &qc
->tf
, *res
= &qc
->result_tf
;
1536 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) || !qc
->err_mask
)
1539 ata_dev_printk(qc
->dev
, KERN_ERR
,
1540 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
1541 "tag %d cdb 0x%x data %u %s\n "
1542 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
1543 "Emask 0x%x (%s)\n",
1544 cmd
->command
, cmd
->feature
, cmd
->nsect
,
1545 cmd
->lbal
, cmd
->lbam
, cmd
->lbah
,
1546 cmd
->hob_feature
, cmd
->hob_nsect
,
1547 cmd
->hob_lbal
, cmd
->hob_lbam
, cmd
->hob_lbah
,
1548 cmd
->device
, qc
->tag
, qc
->cdb
[0], qc
->nbytes
,
1549 dma_str
[qc
->dma_dir
],
1550 res
->command
, res
->feature
, res
->nsect
,
1551 res
->lbal
, res
->lbam
, res
->lbah
,
1552 res
->hob_feature
, res
->hob_nsect
,
1553 res
->hob_lbal
, res
->hob_lbam
, res
->hob_lbah
,
1554 res
->device
, qc
->err_mask
, ata_err_string(qc
->err_mask
));
1558 static int ata_do_reset(struct ata_port
*ap
, ata_reset_fn_t reset
,
1559 unsigned int *classes
)
1563 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1564 classes
[i
] = ATA_DEV_UNKNOWN
;
1566 rc
= reset(ap
, classes
);
1570 /* If any class isn't ATA_DEV_UNKNOWN, consider classification
1571 * is complete and convert all ATA_DEV_UNKNOWN to
1574 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1575 if (classes
[i
] != ATA_DEV_UNKNOWN
)
1578 if (i
< ATA_MAX_DEVICES
)
1579 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1580 if (classes
[i
] == ATA_DEV_UNKNOWN
)
1581 classes
[i
] = ATA_DEV_NONE
;
1586 static int ata_eh_followup_srst_needed(int rc
, int classify
,
1587 const unsigned int *classes
)
1593 if (classify
&& classes
[0] == ATA_DEV_UNKNOWN
)
1598 static int ata_eh_reset(struct ata_port
*ap
, int classify
,
1599 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
1600 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
1602 struct ata_eh_context
*ehc
= &ap
->eh_context
;
1603 unsigned int *classes
= ehc
->classes
;
1604 int tries
= ATA_EH_RESET_TRIES
;
1605 int verbose
= !(ehc
->i
.flags
& ATA_EHI_QUIET
);
1606 unsigned int action
;
1607 ata_reset_fn_t reset
;
1608 int i
, did_followup_srst
, rc
;
1610 /* about to reset */
1611 ata_eh_about_to_do(ap
, NULL
, ehc
->i
.action
& ATA_EH_RESET_MASK
);
1613 /* Determine which reset to use and record in ehc->i.action.
1614 * prereset() may examine and modify it.
1616 action
= ehc
->i
.action
;
1617 ehc
->i
.action
&= ~ATA_EH_RESET_MASK
;
1618 if (softreset
&& (!hardreset
|| (!sata_set_spd_needed(ap
) &&
1619 !(action
& ATA_EH_HARDRESET
))))
1620 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
1622 ehc
->i
.action
|= ATA_EH_HARDRESET
;
1627 if (rc
== -ENOENT
) {
1628 ata_port_printk(ap
, KERN_DEBUG
,
1629 "port disabled. ignoring.\n");
1630 ap
->eh_context
.i
.action
&= ~ATA_EH_RESET_MASK
;
1632 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1633 classes
[i
] = ATA_DEV_NONE
;
1637 ata_port_printk(ap
, KERN_ERR
,
1638 "prereset failed (errno=%d)\n", rc
);
1643 /* prereset() might have modified ehc->i.action */
1644 if (ehc
->i
.action
& ATA_EH_HARDRESET
)
1646 else if (ehc
->i
.action
& ATA_EH_SOFTRESET
)
1649 /* prereset told us not to reset, bang classes and return */
1650 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1651 classes
[i
] = ATA_DEV_NONE
;
1655 /* did prereset() screw up? if so, fix up to avoid oopsing */
1657 ata_port_printk(ap
, KERN_ERR
, "BUG: prereset() requested "
1658 "invalid reset type\n");
1666 /* shut up during boot probing */
1668 ata_port_printk(ap
, KERN_INFO
, "%s resetting port\n",
1669 reset
== softreset
? "soft" : "hard");
1671 /* mark that this EH session started with reset */
1672 ehc
->i
.flags
|= ATA_EHI_DID_RESET
;
1674 rc
= ata_do_reset(ap
, reset
, classes
);
1676 did_followup_srst
= 0;
1677 if (reset
== hardreset
&&
1678 ata_eh_followup_srst_needed(rc
, classify
, classes
)) {
1679 /* okay, let's do follow-up softreset */
1680 did_followup_srst
= 1;
1684 ata_port_printk(ap
, KERN_ERR
,
1685 "follow-up softreset required "
1686 "but no softreset avaliable\n");
1690 ata_eh_about_to_do(ap
, NULL
, ATA_EH_RESET_MASK
);
1691 rc
= ata_do_reset(ap
, reset
, classes
);
1693 if (rc
== 0 && classify
&&
1694 classes
[0] == ATA_DEV_UNKNOWN
) {
1695 ata_port_printk(ap
, KERN_ERR
,
1696 "classification failed\n");
1701 if (rc
&& --tries
) {
1704 if (reset
== softreset
) {
1705 if (did_followup_srst
)
1706 type
= "follow-up soft";
1712 ata_port_printk(ap
, KERN_WARNING
,
1713 "%sreset failed, retrying in 5 secs\n", type
);
1716 if (reset
== hardreset
)
1717 sata_down_spd_limit(ap
);
1724 /* After the reset, the device state is PIO 0 and the
1725 * controller state is undefined. Record the mode.
1727 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1728 ap
->device
[i
].pio_mode
= XFER_PIO_0
;
1731 postreset(ap
, classes
);
1733 /* reset successful, schedule revalidation */
1734 ata_eh_done(ap
, NULL
, ehc
->i
.action
& ATA_EH_RESET_MASK
);
1735 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
1741 static int ata_eh_revalidate_and_attach(struct ata_port
*ap
,
1742 struct ata_device
**r_failed_dev
)
1744 struct ata_eh_context
*ehc
= &ap
->eh_context
;
1745 struct ata_device
*dev
;
1746 unsigned long flags
;
1751 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1752 unsigned int action
, readid_flags
= 0;
1754 dev
= &ap
->device
[i
];
1755 action
= ata_eh_dev_action(dev
);
1757 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
1758 readid_flags
|= ATA_READID_POSTRESET
;
1760 if (action
& ATA_EH_REVALIDATE
&& ata_dev_ready(dev
)) {
1761 if (ata_port_offline(ap
)) {
1766 ata_eh_about_to_do(ap
, dev
, ATA_EH_REVALIDATE
);
1767 rc
= ata_dev_revalidate(dev
, readid_flags
);
1771 ata_eh_done(ap
, dev
, ATA_EH_REVALIDATE
);
1773 /* Configuration may have changed, reconfigure
1776 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
1778 /* schedule the scsi_rescan_device() here */
1779 queue_work(ata_aux_wq
, &(ap
->scsi_rescan_task
));
1780 } else if (dev
->class == ATA_DEV_UNKNOWN
&&
1781 ehc
->tries
[dev
->devno
] &&
1782 ata_class_enabled(ehc
->classes
[dev
->devno
])) {
1783 dev
->class = ehc
->classes
[dev
->devno
];
1785 rc
= ata_dev_read_id(dev
, &dev
->class, readid_flags
,
1788 ehc
->i
.flags
|= ATA_EHI_PRINTINFO
;
1789 rc
= ata_dev_configure(dev
);
1790 ehc
->i
.flags
&= ~ATA_EHI_PRINTINFO
;
1791 } else if (rc
== -ENOENT
) {
1792 /* IDENTIFY was issued to non-existent
1793 * device. No need to reset. Just
1794 * thaw and kill the device.
1796 ata_eh_thaw_port(ap
);
1797 dev
->class = ATA_DEV_UNKNOWN
;
1802 dev
->class = ATA_DEV_UNKNOWN
;
1806 if (ata_dev_enabled(dev
)) {
1807 spin_lock_irqsave(ap
->lock
, flags
);
1808 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
1809 spin_unlock_irqrestore(ap
->lock
, flags
);
1811 /* new device discovered, configure xfermode */
1812 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
1818 *r_failed_dev
= dev
;
1826 * ata_eh_suspend - handle suspend EH action
1827 * @ap: target host port
1828 * @r_failed_dev: result parameter to indicate failing device
1830 * Handle suspend EH action. Disk devices are spinned down and
1831 * other types of devices are just marked suspended. Once
1832 * suspended, no EH action to the device is allowed until it is
1836 * Kernel thread context (may sleep).
1839 * 0 on success, -errno otherwise
1841 static int ata_eh_suspend(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1843 struct ata_device
*dev
;
1848 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1849 unsigned long flags
;
1850 unsigned int action
, err_mask
;
1852 dev
= &ap
->device
[i
];
1853 action
= ata_eh_dev_action(dev
);
1855 if (!ata_dev_enabled(dev
) || !(action
& ATA_EH_SUSPEND
))
1858 WARN_ON(dev
->flags
& ATA_DFLAG_SUSPENDED
);
1860 ata_eh_about_to_do(ap
, dev
, ATA_EH_SUSPEND
);
1862 if (dev
->class == ATA_DEV_ATA
&& !(action
& ATA_EH_PM_FREEZE
)) {
1864 rc
= ata_flush_cache(dev
);
1869 err_mask
= ata_do_simple_cmd(dev
, ATA_CMD_STANDBYNOW1
);
1871 ata_dev_printk(dev
, KERN_ERR
, "failed to "
1872 "spin down (err_mask=0x%x)\n",
1879 spin_lock_irqsave(ap
->lock
, flags
);
1880 dev
->flags
|= ATA_DFLAG_SUSPENDED
;
1881 spin_unlock_irqrestore(ap
->lock
, flags
);
1883 ata_eh_done(ap
, dev
, ATA_EH_SUSPEND
);
1887 *r_failed_dev
= dev
;
1894 * ata_eh_prep_resume - prep for resume EH action
1895 * @ap: target host port
1897 * Clear SUSPENDED in preparation for scheduled resume actions.
1898 * This allows other parts of EH to access the devices being
1902 * Kernel thread context (may sleep).
1904 static void ata_eh_prep_resume(struct ata_port
*ap
)
1906 struct ata_device
*dev
;
1907 unsigned long flags
;
1912 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1913 unsigned int action
;
1915 dev
= &ap
->device
[i
];
1916 action
= ata_eh_dev_action(dev
);
1918 if (!ata_dev_enabled(dev
) || !(action
& ATA_EH_RESUME
))
1921 spin_lock_irqsave(ap
->lock
, flags
);
1922 dev
->flags
&= ~ATA_DFLAG_SUSPENDED
;
1923 spin_unlock_irqrestore(ap
->lock
, flags
);
1930 * ata_eh_resume - handle resume EH action
1931 * @ap: target host port
1932 * @r_failed_dev: result parameter to indicate failing device
1934 * Handle resume EH action. Target devices are already reset and
1935 * revalidated. Spinning up is the only operation left.
1938 * Kernel thread context (may sleep).
1941 * 0 on success, -errno otherwise
1943 static int ata_eh_resume(struct ata_port
*ap
, struct ata_device
**r_failed_dev
)
1945 struct ata_device
*dev
;
1950 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
1951 unsigned int action
, err_mask
;
1953 dev
= &ap
->device
[i
];
1954 action
= ata_eh_dev_action(dev
);
1956 if (!ata_dev_enabled(dev
) || !(action
& ATA_EH_RESUME
))
1959 ata_eh_about_to_do(ap
, dev
, ATA_EH_RESUME
);
1961 if (dev
->class == ATA_DEV_ATA
&& !(action
& ATA_EH_PM_FREEZE
)) {
1962 err_mask
= ata_do_simple_cmd(dev
,
1963 ATA_CMD_IDLEIMMEDIATE
);
1965 ata_dev_printk(dev
, KERN_ERR
, "failed to "
1966 "spin up (err_mask=0x%x)\n",
1973 ata_eh_done(ap
, dev
, ATA_EH_RESUME
);
1977 *r_failed_dev
= dev
;
1982 #endif /* CONFIG_PM */
1984 static int ata_port_nr_enabled(struct ata_port
*ap
)
1988 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1989 if (ata_dev_enabled(&ap
->device
[i
]))
1994 static int ata_port_nr_vacant(struct ata_port
*ap
)
1998 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
1999 if (ap
->device
[i
].class == ATA_DEV_UNKNOWN
)
2004 static int ata_eh_skip_recovery(struct ata_port
*ap
)
2006 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2009 /* skip if all possible devices are suspended */
2010 for (i
= 0; i
< ata_port_max_devices(ap
); i
++) {
2011 struct ata_device
*dev
= &ap
->device
[i
];
2013 if (!(dev
->flags
& ATA_DFLAG_SUSPENDED
))
2017 if (i
== ata_port_max_devices(ap
))
2020 /* thaw frozen port, resume link and recover failed devices */
2021 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) ||
2022 (ehc
->i
.flags
& ATA_EHI_RESUME_LINK
) || ata_port_nr_enabled(ap
))
2025 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
2026 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2027 struct ata_device
*dev
= &ap
->device
[i
];
2029 if (dev
->class == ATA_DEV_UNKNOWN
&&
2030 ehc
->classes
[dev
->devno
] != ATA_DEV_NONE
)
2038 * ata_eh_recover - recover host port after error
2039 * @ap: host port to recover
2040 * @prereset: prereset method (can be NULL)
2041 * @softreset: softreset method (can be NULL)
2042 * @hardreset: hardreset method (can be NULL)
2043 * @postreset: postreset method (can be NULL)
2045 * This is the alpha and omega, eum and yang, heart and soul of
2046 * libata exception handling. On entry, actions required to
2047 * recover the port and hotplug requests are recorded in
2048 * eh_context. This function executes all the operations with
2049 * appropriate retrials and fallbacks to resurrect failed
2050 * devices, detach goners and greet newcomers.
2053 * Kernel thread context (may sleep).
2056 * 0 on success, -errno on failure.
2058 static int ata_eh_recover(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
2059 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2060 ata_postreset_fn_t postreset
)
2062 struct ata_eh_context
*ehc
= &ap
->eh_context
;
2063 struct ata_device
*dev
;
2068 /* prep for recovery */
2069 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2070 dev
= &ap
->device
[i
];
2072 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
2074 /* collect port action mask recorded in dev actions */
2075 ehc
->i
.action
|= ehc
->i
.dev_action
[i
] & ~ATA_EH_PERDEV_MASK
;
2076 ehc
->i
.dev_action
[i
] &= ATA_EH_PERDEV_MASK
;
2078 /* process hotplug request */
2079 if (dev
->flags
& ATA_DFLAG_DETACH
)
2080 ata_eh_detach_dev(dev
);
2082 if (!ata_dev_enabled(dev
) &&
2083 ((ehc
->i
.probe_mask
& (1 << dev
->devno
)) &&
2084 !(ehc
->did_probe_mask
& (1 << dev
->devno
)))) {
2085 ata_eh_detach_dev(dev
);
2087 ehc
->did_probe_mask
|= (1 << dev
->devno
);
2088 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2095 /* if UNLOADING, finish immediately */
2096 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
2099 /* prep for resume */
2100 ata_eh_prep_resume(ap
);
2102 /* skip EH if possible. */
2103 if (ata_eh_skip_recovery(ap
))
2106 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2107 ehc
->classes
[i
] = ATA_DEV_UNKNOWN
;
2110 if (ehc
->i
.action
& ATA_EH_RESET_MASK
) {
2111 ata_eh_freeze_port(ap
);
2113 rc
= ata_eh_reset(ap
, ata_port_nr_vacant(ap
), prereset
,
2114 softreset
, hardreset
, postreset
);
2116 ata_port_printk(ap
, KERN_ERR
,
2117 "reset failed, giving up\n");
2121 ata_eh_thaw_port(ap
);
2124 /* revalidate existing devices and attach new ones */
2125 rc
= ata_eh_revalidate_and_attach(ap
, &dev
);
2129 /* resume devices */
2130 rc
= ata_eh_resume(ap
, &dev
);
2134 /* configure transfer mode if necessary */
2135 if (ehc
->i
.flags
& ATA_EHI_SETMODE
) {
2136 rc
= ata_set_mode(ap
, &dev
);
2139 ehc
->i
.flags
&= ~ATA_EHI_SETMODE
;
2142 /* suspend devices */
2143 rc
= ata_eh_suspend(ap
, &dev
);
2150 ehc
->tries
[dev
->devno
]--;
2154 /* eeek, something went very wrong, give up */
2155 ehc
->tries
[dev
->devno
] = 0;
2159 /* device missing or wrong IDENTIFY data, schedule probing */
2160 ehc
->i
.probe_mask
|= (1 << dev
->devno
);
2161 /* give it just one more chance */
2162 ehc
->tries
[dev
->devno
] = min(ehc
->tries
[dev
->devno
], 1);
2164 if (ehc
->tries
[dev
->devno
] == 1) {
2165 /* This is the last chance, better to slow
2166 * down than lose it.
2168 sata_down_spd_limit(ap
);
2169 ata_down_xfermask_limit(dev
, ATA_DNXFER_PIO
);
2173 if (ata_dev_enabled(dev
) && !ehc
->tries
[dev
->devno
]) {
2174 /* disable device if it has used up all its chances */
2175 ata_dev_disable(dev
);
2177 /* detach if offline */
2178 if (ata_port_offline(ap
))
2179 ata_eh_detach_dev(dev
);
2181 /* probe if requested */
2182 if ((ehc
->i
.probe_mask
& (1 << dev
->devno
)) &&
2183 !(ehc
->did_probe_mask
& (1 << dev
->devno
))) {
2184 ata_eh_detach_dev(dev
);
2187 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
2188 ehc
->did_probe_mask
|= (1 << dev
->devno
);
2189 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2192 /* soft didn't work? be haaaaard */
2193 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
2194 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2196 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2199 if (ata_port_nr_enabled(ap
)) {
2200 ata_port_printk(ap
, KERN_WARNING
, "failed to recover some "
2201 "devices, retrying in 5 secs\n");
2204 /* no device left, repeat fast */
2212 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++)
2213 ata_dev_disable(&ap
->device
[i
]);
2216 DPRINTK("EXIT, rc=%d\n", rc
);
2221 * ata_eh_finish - finish up EH
2222 * @ap: host port to finish EH for
2224 * Recovery is complete. Clean up EH states and retry or finish
2230 static void ata_eh_finish(struct ata_port
*ap
)
2234 /* retry or finish qcs */
2235 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2236 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2238 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
2242 /* FIXME: Once EH migration is complete,
2243 * generate sense data in this function,
2244 * considering both err_mask and tf.
2246 if (qc
->err_mask
& AC_ERR_INVALID
)
2247 ata_eh_qc_complete(qc
);
2249 ata_eh_qc_retry(qc
);
2251 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
2252 ata_eh_qc_complete(qc
);
2254 /* feed zero TF to sense generation */
2255 memset(&qc
->result_tf
, 0, sizeof(qc
->result_tf
));
2256 ata_eh_qc_retry(qc
);
2263 * ata_do_eh - do standard error handling
2264 * @ap: host port to handle error for
2265 * @prereset: prereset method (can be NULL)
2266 * @softreset: softreset method (can be NULL)
2267 * @hardreset: hardreset method (can be NULL)
2268 * @postreset: postreset method (can be NULL)
2270 * Perform standard error handling sequence.
2273 * Kernel thread context (may sleep).
2275 void ata_do_eh(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
2276 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2277 ata_postreset_fn_t postreset
)
2281 ata_eh_recover(ap
, prereset
, softreset
, hardreset
, postreset
);
2287 * ata_eh_handle_port_suspend - perform port suspend operation
2288 * @ap: port to suspend
2293 * Kernel thread context (may sleep).
2295 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
2297 unsigned long flags
;
2300 /* are we suspending? */
2301 spin_lock_irqsave(ap
->lock
, flags
);
2302 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
2303 ap
->pm_mesg
.event
== PM_EVENT_ON
) {
2304 spin_unlock_irqrestore(ap
->lock
, flags
);
2307 spin_unlock_irqrestore(ap
->lock
, flags
);
2309 WARN_ON(ap
->pflags
& ATA_PFLAG_SUSPENDED
);
2312 ata_eh_freeze_port(ap
);
2314 if (ap
->ops
->port_suspend
)
2315 rc
= ap
->ops
->port_suspend(ap
, ap
->pm_mesg
);
2318 spin_lock_irqsave(ap
->lock
, flags
);
2320 ap
->pflags
&= ~ATA_PFLAG_PM_PENDING
;
2322 ap
->pflags
|= ATA_PFLAG_SUSPENDED
;
2324 ata_port_schedule_eh(ap
);
2326 if (ap
->pm_result
) {
2327 *ap
->pm_result
= rc
;
2328 ap
->pm_result
= NULL
;
2331 spin_unlock_irqrestore(ap
->lock
, flags
);
2337 * ata_eh_handle_port_resume - perform port resume operation
2338 * @ap: port to resume
2342 * This function also waits upto one second until all devices
2343 * hanging off this port requests resume EH action. This is to
2344 * prevent invoking EH and thus reset multiple times on resume.
2346 * On DPM resume, where some of devices might not be resumed
2347 * together, this may delay port resume upto one second, but such
2348 * DPM resumes are rare and 1 sec delay isn't too bad.
2351 * Kernel thread context (may sleep).
2353 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
2355 unsigned long timeout
;
2356 unsigned long flags
;
2359 /* are we resuming? */
2360 spin_lock_irqsave(ap
->lock
, flags
);
2361 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
2362 ap
->pm_mesg
.event
!= PM_EVENT_ON
) {
2363 spin_unlock_irqrestore(ap
->lock
, flags
);
2366 spin_unlock_irqrestore(ap
->lock
, flags
);
2369 if (!(ap
->pflags
& ATA_PFLAG_SUSPENDED
))
2372 if (ap
->ops
->port_resume
)
2373 rc
= ap
->ops
->port_resume(ap
);
2375 /* give devices time to request EH */
2376 timeout
= jiffies
+ HZ
; /* 1s max */
2378 for (i
= 0; i
< ATA_MAX_DEVICES
; i
++) {
2379 struct ata_device
*dev
= &ap
->device
[i
];
2380 unsigned int action
= ata_eh_dev_action(dev
);
2382 if ((dev
->flags
& ATA_DFLAG_SUSPENDED
) &&
2383 !(action
& ATA_EH_RESUME
))
2387 if (i
== ATA_MAX_DEVICES
|| time_after(jiffies
, timeout
))
2393 spin_lock_irqsave(ap
->lock
, flags
);
2394 ap
->pflags
&= ~(ATA_PFLAG_PM_PENDING
| ATA_PFLAG_SUSPENDED
);
2395 if (ap
->pm_result
) {
2396 *ap
->pm_result
= rc
;
2397 ap
->pm_result
= NULL
;
2399 spin_unlock_irqrestore(ap
->lock
, flags
);
2401 #endif /* CONFIG_PM */