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 <linux/pci.h>
37 #include <scsi/scsi.h>
38 #include <scsi/scsi_host.h>
39 #include <scsi/scsi_eh.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_cmnd.h>
42 #include "../scsi/scsi_transport_api.h"
44 #include <linux/libata.h>
49 /* speed down verdicts */
50 ATA_EH_SPDN_NCQ_OFF
= (1 << 0),
51 ATA_EH_SPDN_SPEED_DOWN
= (1 << 1),
52 ATA_EH_SPDN_FALLBACK_TO_PIO
= (1 << 2),
53 ATA_EH_SPDN_KEEP_ERRORS
= (1 << 3),
56 ATA_EFLAG_IS_IO
= (1 << 0),
57 ATA_EFLAG_DUBIOUS_XFER
= (1 << 1),
59 /* error categories */
62 ATA_ECAT_TOUT_HSM
= 2,
64 ATA_ECAT_DUBIOUS_NONE
= 4,
65 ATA_ECAT_DUBIOUS_ATA_BUS
= 5,
66 ATA_ECAT_DUBIOUS_TOUT_HSM
= 6,
67 ATA_ECAT_DUBIOUS_UNK_DEV
= 7,
70 /* Waiting in ->prereset can never be reliable. It's
71 * sometimes nice to wait there but it can't be depended upon;
72 * otherwise, we wouldn't be resetting. Just give it enough
73 * time for most drives to spin up.
75 ATA_EH_PRERESET_TIMEOUT
= 10000,
76 ATA_EH_FASTDRAIN_INTERVAL
= 3000,
79 /* The following table determines how we sequence resets. Each entry
80 * represents timeout for that try. The first try can be soft or
81 * hardreset. All others are hardreset if available. In most cases
82 * the first reset w/ 10sec timeout should succeed. Following entries
83 * are mostly for error handling, hotplug and retarded devices.
85 static const unsigned long ata_eh_reset_timeouts
[] = {
86 10000, /* most drives spin up by 10sec */
87 10000, /* > 99% working drives spin up before 20sec */
88 35000, /* give > 30 secs of idleness for retarded devices */
89 5000, /* and sweet one last chance */
90 /* > 1 min has elapsed, give up */
93 static void __ata_port_freeze(struct ata_port
*ap
);
95 static void ata_eh_handle_port_suspend(struct ata_port
*ap
);
96 static void ata_eh_handle_port_resume(struct ata_port
*ap
);
98 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
101 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
103 #endif /* CONFIG_PM */
105 static void __ata_ehi_pushv_desc(struct ata_eh_info
*ehi
, const char *fmt
,
108 ehi
->desc_len
+= vscnprintf(ehi
->desc
+ ehi
->desc_len
,
109 ATA_EH_DESC_LEN
- ehi
->desc_len
,
114 * __ata_ehi_push_desc - push error description without adding separator
116 * @fmt: printf format string
118 * Format string according to @fmt and append it to @ehi->desc.
121 * spin_lock_irqsave(host lock)
123 void __ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
128 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
133 * ata_ehi_push_desc - push error description with separator
135 * @fmt: printf format string
137 * Format string according to @fmt and append it to @ehi->desc.
138 * If @ehi->desc is not empty, ", " is added in-between.
141 * spin_lock_irqsave(host lock)
143 void ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
148 __ata_ehi_push_desc(ehi
, ", ");
151 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
156 * ata_ehi_clear_desc - clean error description
162 * spin_lock_irqsave(host lock)
164 void ata_ehi_clear_desc(struct ata_eh_info
*ehi
)
171 * ata_port_desc - append port description
172 * @ap: target ATA port
173 * @fmt: printf format string
175 * Format string according to @fmt and append it to port
176 * description. If port description is not empty, " " is added
177 * in-between. This function is to be used while initializing
178 * ata_host. The description is printed on host registration.
183 void ata_port_desc(struct ata_port
*ap
, const char *fmt
, ...)
187 WARN_ON(!(ap
->pflags
& ATA_PFLAG_INITIALIZING
));
189 if (ap
->link
.eh_info
.desc_len
)
190 __ata_ehi_push_desc(&ap
->link
.eh_info
, " ");
193 __ata_ehi_pushv_desc(&ap
->link
.eh_info
, fmt
, args
);
200 * ata_port_pbar_desc - append PCI BAR description
201 * @ap: target ATA port
202 * @bar: target PCI BAR
203 * @offset: offset into PCI BAR
204 * @name: name of the area
206 * If @offset is negative, this function formats a string which
207 * contains the name, address, size and type of the BAR and
208 * appends it to the port description. If @offset is zero or
209 * positive, only name and offsetted address is appended.
214 void ata_port_pbar_desc(struct ata_port
*ap
, int bar
, ssize_t offset
,
217 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
219 unsigned long long start
, len
;
221 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
223 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
226 start
= (unsigned long long)pci_resource_start(pdev
, bar
);
227 len
= (unsigned long long)pci_resource_len(pdev
, bar
);
230 ata_port_desc(ap
, "%s %s%llu@0x%llx", name
, type
, len
, start
);
232 ata_port_desc(ap
, "%s 0x%llx", name
,
233 start
+ (unsigned long long)offset
);
236 #endif /* CONFIG_PCI */
238 static void ata_ering_record(struct ata_ering
*ering
, unsigned int eflags
,
239 unsigned int err_mask
)
241 struct ata_ering_entry
*ent
;
246 ering
->cursor
%= ATA_ERING_SIZE
;
248 ent
= &ering
->ring
[ering
->cursor
];
249 ent
->eflags
= eflags
;
250 ent
->err_mask
= err_mask
;
251 ent
->timestamp
= get_jiffies_64();
254 static struct ata_ering_entry
*ata_ering_top(struct ata_ering
*ering
)
256 struct ata_ering_entry
*ent
= &ering
->ring
[ering
->cursor
];
263 static void ata_ering_clear(struct ata_ering
*ering
)
265 memset(ering
, 0, sizeof(*ering
));
268 static int ata_ering_map(struct ata_ering
*ering
,
269 int (*map_fn
)(struct ata_ering_entry
*, void *),
273 struct ata_ering_entry
*ent
;
277 ent
= &ering
->ring
[idx
];
280 rc
= map_fn(ent
, arg
);
283 idx
= (idx
- 1 + ATA_ERING_SIZE
) % ATA_ERING_SIZE
;
284 } while (idx
!= ering
->cursor
);
289 static unsigned int ata_eh_dev_action(struct ata_device
*dev
)
291 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
293 return ehc
->i
.action
| ehc
->i
.dev_action
[dev
->devno
];
296 static void ata_eh_clear_action(struct ata_link
*link
, struct ata_device
*dev
,
297 struct ata_eh_info
*ehi
, unsigned int action
)
299 struct ata_device
*tdev
;
302 ehi
->action
&= ~action
;
303 ata_link_for_each_dev(tdev
, link
)
304 ehi
->dev_action
[tdev
->devno
] &= ~action
;
306 /* doesn't make sense for port-wide EH actions */
307 WARN_ON(!(action
& ATA_EH_PERDEV_MASK
));
309 /* break ehi->action into ehi->dev_action */
310 if (ehi
->action
& action
) {
311 ata_link_for_each_dev(tdev
, link
)
312 ehi
->dev_action
[tdev
->devno
] |=
313 ehi
->action
& action
;
314 ehi
->action
&= ~action
;
317 /* turn off the specified per-dev action */
318 ehi
->dev_action
[dev
->devno
] &= ~action
;
323 * ata_scsi_timed_out - SCSI layer time out callback
324 * @cmd: timed out SCSI command
326 * Handles SCSI layer timeout. We race with normal completion of
327 * the qc for @cmd. If the qc is already gone, we lose and let
328 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
329 * timed out and EH should be invoked. Prevent ata_qc_complete()
330 * from finishing it by setting EH_SCHEDULED and return
333 * TODO: kill this function once old EH is gone.
336 * Called from timer context
339 * EH_HANDLED or EH_NOT_HANDLED
341 enum scsi_eh_timer_return
ata_scsi_timed_out(struct scsi_cmnd
*cmd
)
343 struct Scsi_Host
*host
= cmd
->device
->host
;
344 struct ata_port
*ap
= ata_shost_to_port(host
);
346 struct ata_queued_cmd
*qc
;
347 enum scsi_eh_timer_return ret
;
351 if (ap
->ops
->error_handler
) {
352 ret
= EH_NOT_HANDLED
;
357 spin_lock_irqsave(ap
->lock
, flags
);
358 qc
= ata_qc_from_tag(ap
, ap
->link
.active_tag
);
360 WARN_ON(qc
->scsicmd
!= cmd
);
361 qc
->flags
|= ATA_QCFLAG_EH_SCHEDULED
;
362 qc
->err_mask
|= AC_ERR_TIMEOUT
;
363 ret
= EH_NOT_HANDLED
;
365 spin_unlock_irqrestore(ap
->lock
, flags
);
368 DPRINTK("EXIT, ret=%d\n", ret
);
373 * ata_scsi_error - SCSI layer error handler callback
374 * @host: SCSI host on which error occurred
376 * Handles SCSI-layer-thrown error events.
379 * Inherited from SCSI layer (none, can sleep)
384 void ata_scsi_error(struct Scsi_Host
*host
)
386 struct ata_port
*ap
= ata_shost_to_port(host
);
392 /* synchronize with port task */
393 ata_port_flush_task(ap
);
395 /* synchronize with host lock and sort out timeouts */
397 /* For new EH, all qcs are finished in one of three ways -
398 * normal completion, error completion, and SCSI timeout.
399 * Both cmpletions can race against SCSI timeout. When normal
400 * completion wins, the qc never reaches EH. When error
401 * completion wins, the qc has ATA_QCFLAG_FAILED set.
403 * When SCSI timeout wins, things are a bit more complex.
404 * Normal or error completion can occur after the timeout but
405 * before this point. In such cases, both types of
406 * completions are honored. A scmd is determined to have
407 * timed out iff its associated qc is active and not failed.
409 if (ap
->ops
->error_handler
) {
410 struct scsi_cmnd
*scmd
, *tmp
;
413 spin_lock_irqsave(ap
->lock
, flags
);
415 list_for_each_entry_safe(scmd
, tmp
, &host
->eh_cmd_q
, eh_entry
) {
416 struct ata_queued_cmd
*qc
;
418 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
419 qc
= __ata_qc_from_tag(ap
, i
);
420 if (qc
->flags
& ATA_QCFLAG_ACTIVE
&&
425 if (i
< ATA_MAX_QUEUE
) {
426 /* the scmd has an associated qc */
427 if (!(qc
->flags
& ATA_QCFLAG_FAILED
)) {
428 /* which hasn't failed yet, timeout */
429 qc
->err_mask
|= AC_ERR_TIMEOUT
;
430 qc
->flags
|= ATA_QCFLAG_FAILED
;
434 /* Normal completion occurred after
435 * SCSI timeout but before this point.
436 * Successfully complete it.
438 scmd
->retries
= scmd
->allowed
;
439 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
443 /* If we have timed out qcs. They belong to EH from
444 * this point but the state of the controller is
445 * unknown. Freeze the port to make sure the IRQ
446 * handler doesn't diddle with those qcs. This must
447 * be done atomically w.r.t. setting QCFLAG_FAILED.
450 __ata_port_freeze(ap
);
452 spin_unlock_irqrestore(ap
->lock
, flags
);
454 /* initialize eh_tries */
455 ap
->eh_tries
= ATA_EH_MAX_TRIES
;
457 spin_unlock_wait(ap
->lock
);
460 /* invoke error handler */
461 if (ap
->ops
->error_handler
) {
462 struct ata_link
*link
;
464 /* kill fast drain timer */
465 del_timer_sync(&ap
->fastdrain_timer
);
467 /* process port resume request */
468 ata_eh_handle_port_resume(ap
);
470 /* fetch & clear EH info */
471 spin_lock_irqsave(ap
->lock
, flags
);
473 __ata_port_for_each_link(link
, ap
) {
474 struct ata_eh_context
*ehc
= &link
->eh_context
;
475 struct ata_device
*dev
;
477 memset(&link
->eh_context
, 0, sizeof(link
->eh_context
));
478 link
->eh_context
.i
= link
->eh_info
;
479 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
481 ata_link_for_each_dev(dev
, link
) {
482 int devno
= dev
->devno
;
484 ehc
->saved_xfer_mode
[devno
] = dev
->xfer_mode
;
485 if (ata_ncq_enabled(dev
))
486 ehc
->saved_ncq_enabled
|= 1 << devno
;
490 ap
->pflags
|= ATA_PFLAG_EH_IN_PROGRESS
;
491 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
492 ap
->excl_link
= NULL
; /* don't maintain exclusion over EH */
494 spin_unlock_irqrestore(ap
->lock
, flags
);
496 /* invoke EH, skip if unloading or suspended */
497 if (!(ap
->pflags
& (ATA_PFLAG_UNLOADING
| ATA_PFLAG_SUSPENDED
)))
498 ap
->ops
->error_handler(ap
);
502 /* process port suspend request */
503 ata_eh_handle_port_suspend(ap
);
505 /* Exception might have happend after ->error_handler
506 * recovered the port but before this point. Repeat
509 spin_lock_irqsave(ap
->lock
, flags
);
511 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
) {
512 if (--ap
->eh_tries
) {
513 spin_unlock_irqrestore(ap
->lock
, flags
);
516 ata_port_printk(ap
, KERN_ERR
, "EH pending after %d "
517 "tries, giving up\n", ATA_EH_MAX_TRIES
);
518 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
521 /* this run is complete, make sure EH info is clear */
522 __ata_port_for_each_link(link
, ap
)
523 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
525 /* Clear host_eh_scheduled while holding ap->lock such
526 * that if exception occurs after this point but
527 * before EH completion, SCSI midlayer will
530 host
->host_eh_scheduled
= 0;
532 spin_unlock_irqrestore(ap
->lock
, flags
);
534 WARN_ON(ata_qc_from_tag(ap
, ap
->link
.active_tag
) == NULL
);
535 ap
->ops
->eng_timeout(ap
);
538 /* finish or retry handled scmd's and clean up */
539 WARN_ON(host
->host_failed
|| !list_empty(&host
->eh_cmd_q
));
541 scsi_eh_flush_done_q(&ap
->eh_done_q
);
544 spin_lock_irqsave(ap
->lock
, flags
);
546 if (ap
->pflags
& ATA_PFLAG_LOADING
)
547 ap
->pflags
&= ~ATA_PFLAG_LOADING
;
548 else if (ap
->pflags
& ATA_PFLAG_SCSI_HOTPLUG
)
549 queue_delayed_work(ata_aux_wq
, &ap
->hotplug_task
, 0);
551 if (ap
->pflags
& ATA_PFLAG_RECOVERED
)
552 ata_port_printk(ap
, KERN_INFO
, "EH complete\n");
554 ap
->pflags
&= ~(ATA_PFLAG_SCSI_HOTPLUG
| ATA_PFLAG_RECOVERED
);
556 /* tell wait_eh that we're done */
557 ap
->pflags
&= ~ATA_PFLAG_EH_IN_PROGRESS
;
558 wake_up_all(&ap
->eh_wait_q
);
560 spin_unlock_irqrestore(ap
->lock
, flags
);
566 * ata_port_wait_eh - Wait for the currently pending EH to complete
567 * @ap: Port to wait EH for
569 * Wait until the currently pending EH is complete.
572 * Kernel thread context (may sleep).
574 void ata_port_wait_eh(struct ata_port
*ap
)
580 spin_lock_irqsave(ap
->lock
, flags
);
582 while (ap
->pflags
& (ATA_PFLAG_EH_PENDING
| ATA_PFLAG_EH_IN_PROGRESS
)) {
583 prepare_to_wait(&ap
->eh_wait_q
, &wait
, TASK_UNINTERRUPTIBLE
);
584 spin_unlock_irqrestore(ap
->lock
, flags
);
586 spin_lock_irqsave(ap
->lock
, flags
);
588 finish_wait(&ap
->eh_wait_q
, &wait
);
590 spin_unlock_irqrestore(ap
->lock
, flags
);
592 /* make sure SCSI EH is complete */
593 if (scsi_host_in_recovery(ap
->scsi_host
)) {
599 static int ata_eh_nr_in_flight(struct ata_port
*ap
)
604 /* count only non-internal commands */
605 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++)
606 if (ata_qc_from_tag(ap
, tag
))
612 void ata_eh_fastdrain_timerfn(unsigned long arg
)
614 struct ata_port
*ap
= (void *)arg
;
618 spin_lock_irqsave(ap
->lock
, flags
);
620 cnt
= ata_eh_nr_in_flight(ap
);
626 if (cnt
== ap
->fastdrain_cnt
) {
629 /* No progress during the last interval, tag all
630 * in-flight qcs as timed out and freeze the port.
632 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++) {
633 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
635 qc
->err_mask
|= AC_ERR_TIMEOUT
;
640 /* some qcs have finished, give it another chance */
641 ap
->fastdrain_cnt
= cnt
;
642 ap
->fastdrain_timer
.expires
=
643 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
644 add_timer(&ap
->fastdrain_timer
);
648 spin_unlock_irqrestore(ap
->lock
, flags
);
652 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
653 * @ap: target ATA port
654 * @fastdrain: activate fast drain
656 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
657 * is non-zero and EH wasn't pending before. Fast drain ensures
658 * that EH kicks in in timely manner.
661 * spin_lock_irqsave(host lock)
663 static void ata_eh_set_pending(struct ata_port
*ap
, int fastdrain
)
667 /* already scheduled? */
668 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
)
671 ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
676 /* do we have in-flight qcs? */
677 cnt
= ata_eh_nr_in_flight(ap
);
681 /* activate fast drain */
682 ap
->fastdrain_cnt
= cnt
;
683 ap
->fastdrain_timer
.expires
=
684 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
685 add_timer(&ap
->fastdrain_timer
);
689 * ata_qc_schedule_eh - schedule qc for error handling
690 * @qc: command to schedule error handling for
692 * Schedule error handling for @qc. EH will kick in as soon as
693 * other commands are drained.
696 * spin_lock_irqsave(host lock)
698 void ata_qc_schedule_eh(struct ata_queued_cmd
*qc
)
700 struct ata_port
*ap
= qc
->ap
;
702 WARN_ON(!ap
->ops
->error_handler
);
704 qc
->flags
|= ATA_QCFLAG_FAILED
;
705 ata_eh_set_pending(ap
, 1);
707 /* The following will fail if timeout has already expired.
708 * ata_scsi_error() takes care of such scmds on EH entry.
709 * Note that ATA_QCFLAG_FAILED is unconditionally set after
710 * this function completes.
712 scsi_req_abort_cmd(qc
->scsicmd
);
716 * ata_port_schedule_eh - schedule error handling without a qc
717 * @ap: ATA port to schedule EH for
719 * Schedule error handling for @ap. EH will kick in as soon as
720 * all commands are drained.
723 * spin_lock_irqsave(host lock)
725 void ata_port_schedule_eh(struct ata_port
*ap
)
727 WARN_ON(!ap
->ops
->error_handler
);
729 if (ap
->pflags
& ATA_PFLAG_INITIALIZING
)
732 ata_eh_set_pending(ap
, 1);
733 scsi_schedule_eh(ap
->scsi_host
);
735 DPRINTK("port EH scheduled\n");
738 static int ata_do_link_abort(struct ata_port
*ap
, struct ata_link
*link
)
740 int tag
, nr_aborted
= 0;
742 WARN_ON(!ap
->ops
->error_handler
);
744 /* we're gonna abort all commands, no need for fast drain */
745 ata_eh_set_pending(ap
, 0);
747 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
748 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
750 if (qc
&& (!link
|| qc
->dev
->link
== link
)) {
751 qc
->flags
|= ATA_QCFLAG_FAILED
;
758 ata_port_schedule_eh(ap
);
764 * ata_link_abort - abort all qc's on the link
765 * @link: ATA link to abort qc's for
767 * Abort all active qc's active on @link and schedule EH.
770 * spin_lock_irqsave(host lock)
773 * Number of aborted qc's.
775 int ata_link_abort(struct ata_link
*link
)
777 return ata_do_link_abort(link
->ap
, link
);
781 * ata_port_abort - abort all qc's on the port
782 * @ap: ATA port to abort qc's for
784 * Abort all active qc's of @ap and schedule EH.
787 * spin_lock_irqsave(host_set lock)
790 * Number of aborted qc's.
792 int ata_port_abort(struct ata_port
*ap
)
794 return ata_do_link_abort(ap
, NULL
);
798 * __ata_port_freeze - freeze port
799 * @ap: ATA port to freeze
801 * This function is called when HSM violation or some other
802 * condition disrupts normal operation of the port. Frozen port
803 * is not allowed to perform any operation until the port is
804 * thawed, which usually follows a successful reset.
806 * ap->ops->freeze() callback can be used for freezing the port
807 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
808 * port cannot be frozen hardware-wise, the interrupt handler
809 * must ack and clear interrupts unconditionally while the port
813 * spin_lock_irqsave(host lock)
815 static void __ata_port_freeze(struct ata_port
*ap
)
817 WARN_ON(!ap
->ops
->error_handler
);
822 ap
->pflags
|= ATA_PFLAG_FROZEN
;
824 DPRINTK("ata%u port frozen\n", ap
->print_id
);
828 * ata_port_freeze - abort & freeze port
829 * @ap: ATA port to freeze
831 * Abort and freeze @ap.
834 * spin_lock_irqsave(host lock)
837 * Number of aborted commands.
839 int ata_port_freeze(struct ata_port
*ap
)
843 WARN_ON(!ap
->ops
->error_handler
);
845 nr_aborted
= ata_port_abort(ap
);
846 __ata_port_freeze(ap
);
852 * sata_async_notification - SATA async notification handler
853 * @ap: ATA port where async notification is received
855 * Handler to be called when async notification via SDB FIS is
856 * received. This function schedules EH if necessary.
859 * spin_lock_irqsave(host lock)
862 * 1 if EH is scheduled, 0 otherwise.
864 int sata_async_notification(struct ata_port
*ap
)
869 if (!(ap
->flags
& ATA_FLAG_AN
))
872 rc
= sata_scr_read(&ap
->link
, SCR_NOTIFICATION
, &sntf
);
874 sata_scr_write(&ap
->link
, SCR_NOTIFICATION
, sntf
);
876 if (!sata_pmp_attached(ap
) || rc
) {
877 /* PMP is not attached or SNTF is not available */
878 if (!sata_pmp_attached(ap
)) {
879 /* PMP is not attached. Check whether ATAPI
880 * AN is configured. If so, notify media
883 struct ata_device
*dev
= ap
->link
.device
;
885 if ((dev
->class == ATA_DEV_ATAPI
) &&
886 (dev
->flags
& ATA_DFLAG_AN
))
887 ata_scsi_media_change_notify(dev
);
890 /* PMP is attached but SNTF is not available.
891 * ATAPI async media change notification is
892 * not used. The PMP must be reporting PHY
893 * status change, schedule EH.
895 ata_port_schedule_eh(ap
);
899 /* PMP is attached and SNTF is available */
900 struct ata_link
*link
;
902 /* check and notify ATAPI AN */
903 ata_port_for_each_link(link
, ap
) {
904 if (!(sntf
& (1 << link
->pmp
)))
907 if ((link
->device
->class == ATA_DEV_ATAPI
) &&
908 (link
->device
->flags
& ATA_DFLAG_AN
))
909 ata_scsi_media_change_notify(link
->device
);
912 /* If PMP is reporting that PHY status of some
913 * downstream ports has changed, schedule EH.
915 if (sntf
& (1 << SATA_PMP_CTRL_PORT
)) {
916 ata_port_schedule_eh(ap
);
925 * ata_eh_freeze_port - EH helper to freeze port
926 * @ap: ATA port to freeze
933 void ata_eh_freeze_port(struct ata_port
*ap
)
937 if (!ap
->ops
->error_handler
)
940 spin_lock_irqsave(ap
->lock
, flags
);
941 __ata_port_freeze(ap
);
942 spin_unlock_irqrestore(ap
->lock
, flags
);
946 * ata_port_thaw_port - EH helper to thaw port
947 * @ap: ATA port to thaw
949 * Thaw frozen port @ap.
954 void ata_eh_thaw_port(struct ata_port
*ap
)
958 if (!ap
->ops
->error_handler
)
961 spin_lock_irqsave(ap
->lock
, flags
);
963 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
968 spin_unlock_irqrestore(ap
->lock
, flags
);
970 DPRINTK("ata%u port thawed\n", ap
->print_id
);
973 static void ata_eh_scsidone(struct scsi_cmnd
*scmd
)
978 static void __ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
980 struct ata_port
*ap
= qc
->ap
;
981 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
984 spin_lock_irqsave(ap
->lock
, flags
);
985 qc
->scsidone
= ata_eh_scsidone
;
986 __ata_qc_complete(qc
);
987 WARN_ON(ata_tag_valid(qc
->tag
));
988 spin_unlock_irqrestore(ap
->lock
, flags
);
990 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
994 * ata_eh_qc_complete - Complete an active ATA command from EH
995 * @qc: Command to complete
997 * Indicate to the mid and upper layers that an ATA command has
998 * completed. To be used from EH.
1000 void ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1002 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1003 scmd
->retries
= scmd
->allowed
;
1004 __ata_eh_qc_complete(qc
);
1008 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1009 * @qc: Command to retry
1011 * Indicate to the mid and upper layers that an ATA command
1012 * should be retried. To be used from EH.
1014 * SCSI midlayer limits the number of retries to scmd->allowed.
1015 * scmd->retries is decremented for commands which get retried
1016 * due to unrelated failures (qc->err_mask is zero).
1018 void ata_eh_qc_retry(struct ata_queued_cmd
*qc
)
1020 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1021 if (!qc
->err_mask
&& scmd
->retries
)
1023 __ata_eh_qc_complete(qc
);
1027 * ata_eh_detach_dev - detach ATA device
1028 * @dev: ATA device to detach
1035 void ata_eh_detach_dev(struct ata_device
*dev
)
1037 struct ata_link
*link
= dev
->link
;
1038 struct ata_port
*ap
= link
->ap
;
1039 unsigned long flags
;
1041 ata_dev_disable(dev
);
1043 spin_lock_irqsave(ap
->lock
, flags
);
1045 dev
->flags
&= ~ATA_DFLAG_DETACH
;
1047 if (ata_scsi_offline_dev(dev
)) {
1048 dev
->flags
|= ATA_DFLAG_DETACHED
;
1049 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
1052 /* clear per-dev EH actions */
1053 ata_eh_clear_action(link
, dev
, &link
->eh_info
, ATA_EH_PERDEV_MASK
);
1054 ata_eh_clear_action(link
, dev
, &link
->eh_context
.i
, ATA_EH_PERDEV_MASK
);
1056 spin_unlock_irqrestore(ap
->lock
, flags
);
1060 * ata_eh_about_to_do - about to perform eh_action
1061 * @link: target ATA link
1062 * @dev: target ATA dev for per-dev action (can be NULL)
1063 * @action: action about to be performed
1065 * Called just before performing EH actions to clear related bits
1066 * in @link->eh_info such that eh actions are not unnecessarily
1072 void ata_eh_about_to_do(struct ata_link
*link
, struct ata_device
*dev
,
1073 unsigned int action
)
1075 struct ata_port
*ap
= link
->ap
;
1076 struct ata_eh_info
*ehi
= &link
->eh_info
;
1077 struct ata_eh_context
*ehc
= &link
->eh_context
;
1078 unsigned long flags
;
1080 spin_lock_irqsave(ap
->lock
, flags
);
1082 ata_eh_clear_action(link
, dev
, ehi
, action
);
1084 if (!(ehc
->i
.flags
& ATA_EHI_QUIET
))
1085 ap
->pflags
|= ATA_PFLAG_RECOVERED
;
1087 spin_unlock_irqrestore(ap
->lock
, flags
);
1091 * ata_eh_done - EH action complete
1092 * @ap: target ATA port
1093 * @dev: target ATA dev for per-dev action (can be NULL)
1094 * @action: action just completed
1096 * Called right after performing EH actions to clear related bits
1097 * in @link->eh_context.
1102 void ata_eh_done(struct ata_link
*link
, struct ata_device
*dev
,
1103 unsigned int action
)
1105 struct ata_eh_context
*ehc
= &link
->eh_context
;
1107 ata_eh_clear_action(link
, dev
, &ehc
->i
, action
);
1111 * ata_err_string - convert err_mask to descriptive string
1112 * @err_mask: error mask to convert to string
1114 * Convert @err_mask to descriptive string. Errors are
1115 * prioritized according to severity and only the most severe
1116 * error is reported.
1122 * Descriptive string for @err_mask
1124 static const char *ata_err_string(unsigned int err_mask
)
1126 if (err_mask
& AC_ERR_HOST_BUS
)
1127 return "host bus error";
1128 if (err_mask
& AC_ERR_ATA_BUS
)
1129 return "ATA bus error";
1130 if (err_mask
& AC_ERR_TIMEOUT
)
1132 if (err_mask
& AC_ERR_HSM
)
1133 return "HSM violation";
1134 if (err_mask
& AC_ERR_SYSTEM
)
1135 return "internal error";
1136 if (err_mask
& AC_ERR_MEDIA
)
1137 return "media error";
1138 if (err_mask
& AC_ERR_INVALID
)
1139 return "invalid argument";
1140 if (err_mask
& AC_ERR_DEV
)
1141 return "device error";
1142 return "unknown error";
1146 * ata_read_log_page - read a specific log page
1147 * @dev: target device
1148 * @page: page to read
1149 * @buf: buffer to store read page
1150 * @sectors: number of sectors to read
1152 * Read log page using READ_LOG_EXT command.
1155 * Kernel thread context (may sleep).
1158 * 0 on success, AC_ERR_* mask otherwise.
1160 static unsigned int ata_read_log_page(struct ata_device
*dev
,
1161 u8 page
, void *buf
, unsigned int sectors
)
1163 struct ata_taskfile tf
;
1164 unsigned int err_mask
;
1166 DPRINTK("read log page - page %d\n", page
);
1168 ata_tf_init(dev
, &tf
);
1169 tf
.command
= ATA_CMD_READ_LOG_EXT
;
1172 tf
.hob_nsect
= sectors
>> 8;
1173 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA48
| ATA_TFLAG_DEVICE
;
1174 tf
.protocol
= ATA_PROT_PIO
;
1176 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1177 buf
, sectors
* ATA_SECT_SIZE
, 0);
1179 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
1184 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1185 * @dev: Device to read log page 10h from
1186 * @tag: Resulting tag of the failed command
1187 * @tf: Resulting taskfile registers of the failed command
1189 * Read log page 10h to obtain NCQ error details and clear error
1193 * Kernel thread context (may sleep).
1196 * 0 on success, -errno otherwise.
1198 static int ata_eh_read_log_10h(struct ata_device
*dev
,
1199 int *tag
, struct ata_taskfile
*tf
)
1201 u8
*buf
= dev
->link
->ap
->sector_buf
;
1202 unsigned int err_mask
;
1206 err_mask
= ata_read_log_page(dev
, ATA_LOG_SATA_NCQ
, buf
, 1);
1211 for (i
= 0; i
< ATA_SECT_SIZE
; i
++)
1214 ata_dev_printk(dev
, KERN_WARNING
,
1215 "invalid checksum 0x%x on log page 10h\n", csum
);
1220 *tag
= buf
[0] & 0x1f;
1222 tf
->command
= buf
[2];
1223 tf
->feature
= buf
[3];
1227 tf
->device
= buf
[7];
1228 tf
->hob_lbal
= buf
[8];
1229 tf
->hob_lbam
= buf
[9];
1230 tf
->hob_lbah
= buf
[10];
1231 tf
->nsect
= buf
[12];
1232 tf
->hob_nsect
= buf
[13];
1238 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1239 * @dev: device to perform REQUEST_SENSE to
1240 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1242 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1243 * SENSE. This function is EH helper.
1246 * Kernel thread context (may sleep).
1249 * 0 on success, AC_ERR_* mask on failure
1251 static unsigned int atapi_eh_request_sense(struct ata_queued_cmd
*qc
)
1253 struct ata_device
*dev
= qc
->dev
;
1254 unsigned char *sense_buf
= qc
->scsicmd
->sense_buffer
;
1255 struct ata_port
*ap
= dev
->link
->ap
;
1256 struct ata_taskfile tf
;
1257 u8 cdb
[ATAPI_CDB_LEN
];
1259 DPRINTK("ATAPI request sense\n");
1261 /* FIXME: is this needed? */
1262 memset(sense_buf
, 0, SCSI_SENSE_BUFFERSIZE
);
1264 /* initialize sense_buf with the error register,
1265 * for the case where they are -not- overwritten
1267 sense_buf
[0] = 0x70;
1268 sense_buf
[2] = qc
->result_tf
.feature
>> 4;
1270 /* some devices time out if garbage left in tf */
1271 ata_tf_init(dev
, &tf
);
1273 memset(cdb
, 0, ATAPI_CDB_LEN
);
1274 cdb
[0] = REQUEST_SENSE
;
1275 cdb
[4] = SCSI_SENSE_BUFFERSIZE
;
1277 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1278 tf
.command
= ATA_CMD_PACKET
;
1280 /* is it pointless to prefer PIO for "safety reasons"? */
1281 if (ap
->flags
& ATA_FLAG_PIO_DMA
) {
1282 tf
.protocol
= ATAPI_PROT_DMA
;
1283 tf
.feature
|= ATAPI_PKT_DMA
;
1285 tf
.protocol
= ATAPI_PROT_PIO
;
1286 tf
.lbam
= SCSI_SENSE_BUFFERSIZE
;
1290 return ata_exec_internal(dev
, &tf
, cdb
, DMA_FROM_DEVICE
,
1291 sense_buf
, SCSI_SENSE_BUFFERSIZE
, 0);
1295 * ata_eh_analyze_serror - analyze SError for a failed port
1296 * @link: ATA link to analyze SError for
1298 * Analyze SError if available and further determine cause of
1304 static void ata_eh_analyze_serror(struct ata_link
*link
)
1306 struct ata_eh_context
*ehc
= &link
->eh_context
;
1307 u32 serror
= ehc
->i
.serror
;
1308 unsigned int err_mask
= 0, action
= 0;
1311 if (serror
& (SERR_PERSISTENT
| SERR_DATA
)) {
1312 err_mask
|= AC_ERR_ATA_BUS
;
1313 action
|= ATA_EH_RESET
;
1315 if (serror
& SERR_PROTOCOL
) {
1316 err_mask
|= AC_ERR_HSM
;
1317 action
|= ATA_EH_RESET
;
1319 if (serror
& SERR_INTERNAL
) {
1320 err_mask
|= AC_ERR_SYSTEM
;
1321 action
|= ATA_EH_RESET
;
1324 /* Determine whether a hotplug event has occurred. Both
1325 * SError.N/X are considered hotplug events for enabled or
1326 * host links. For disabled PMP links, only N bit is
1327 * considered as X bit is left at 1 for link plugging.
1331 if (!(link
->flags
& ATA_LFLAG_DISABLED
) || ata_is_host_link(link
))
1332 hotplug_mask
= SERR_PHYRDY_CHG
| SERR_DEV_XCHG
;
1334 hotplug_mask
= SERR_PHYRDY_CHG
;
1336 if (serror
& hotplug_mask
)
1337 ata_ehi_hotplugged(&ehc
->i
);
1339 ehc
->i
.err_mask
|= err_mask
;
1340 ehc
->i
.action
|= action
;
1344 * ata_eh_analyze_ncq_error - analyze NCQ error
1345 * @link: ATA link to analyze NCQ error for
1347 * Read log page 10h, determine the offending qc and acquire
1348 * error status TF. For NCQ device errors, all LLDDs have to do
1349 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1353 * Kernel thread context (may sleep).
1355 void ata_eh_analyze_ncq_error(struct ata_link
*link
)
1357 struct ata_port
*ap
= link
->ap
;
1358 struct ata_eh_context
*ehc
= &link
->eh_context
;
1359 struct ata_device
*dev
= link
->device
;
1360 struct ata_queued_cmd
*qc
;
1361 struct ata_taskfile tf
;
1364 /* if frozen, we can't do much */
1365 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1368 /* is it NCQ device error? */
1369 if (!link
->sactive
|| !(ehc
->i
.err_mask
& AC_ERR_DEV
))
1372 /* has LLDD analyzed already? */
1373 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1374 qc
= __ata_qc_from_tag(ap
, tag
);
1376 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1383 /* okay, this error is ours */
1384 rc
= ata_eh_read_log_10h(dev
, &tag
, &tf
);
1386 ata_link_printk(link
, KERN_ERR
, "failed to read log page 10h "
1387 "(errno=%d)\n", rc
);
1391 if (!(link
->sactive
& (1 << tag
))) {
1392 ata_link_printk(link
, KERN_ERR
, "log page 10h reported "
1393 "inactive tag %d\n", tag
);
1397 /* we've got the perpetrator, condemn it */
1398 qc
= __ata_qc_from_tag(ap
, tag
);
1399 memcpy(&qc
->result_tf
, &tf
, sizeof(tf
));
1400 qc
->result_tf
.flags
= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA
| ATA_TFLAG_LBA48
;
1401 qc
->err_mask
|= AC_ERR_DEV
| AC_ERR_NCQ
;
1402 ehc
->i
.err_mask
&= ~AC_ERR_DEV
;
1406 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1407 * @qc: qc to analyze
1408 * @tf: Taskfile registers to analyze
1410 * Analyze taskfile of @qc and further determine cause of
1411 * failure. This function also requests ATAPI sense data if
1415 * Kernel thread context (may sleep).
1418 * Determined recovery action
1420 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd
*qc
,
1421 const struct ata_taskfile
*tf
)
1423 unsigned int tmp
, action
= 0;
1424 u8 stat
= tf
->command
, err
= tf
->feature
;
1426 if ((stat
& (ATA_BUSY
| ATA_DRQ
| ATA_DRDY
)) != ATA_DRDY
) {
1427 qc
->err_mask
|= AC_ERR_HSM
;
1428 return ATA_EH_RESET
;
1431 if (stat
& (ATA_ERR
| ATA_DF
))
1432 qc
->err_mask
|= AC_ERR_DEV
;
1436 switch (qc
->dev
->class) {
1439 qc
->err_mask
|= AC_ERR_ATA_BUS
;
1441 qc
->err_mask
|= AC_ERR_MEDIA
;
1443 qc
->err_mask
|= AC_ERR_INVALID
;
1447 if (!(qc
->ap
->pflags
& ATA_PFLAG_FROZEN
)) {
1448 tmp
= atapi_eh_request_sense(qc
);
1450 /* ATA_QCFLAG_SENSE_VALID is used to
1451 * tell atapi_qc_complete() that sense
1452 * data is already valid.
1454 * TODO: interpret sense data and set
1455 * appropriate err_mask.
1457 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1459 qc
->err_mask
|= tmp
;
1463 if (qc
->err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
| AC_ERR_ATA_BUS
))
1464 action
|= ATA_EH_RESET
;
1469 static int ata_eh_categorize_error(unsigned int eflags
, unsigned int err_mask
,
1474 if (!(eflags
& ATA_EFLAG_DUBIOUS_XFER
))
1478 base
= ATA_ECAT_DUBIOUS_NONE
;
1480 if (err_mask
& AC_ERR_ATA_BUS
)
1481 return base
+ ATA_ECAT_ATA_BUS
;
1483 if (err_mask
& AC_ERR_TIMEOUT
)
1484 return base
+ ATA_ECAT_TOUT_HSM
;
1486 if (eflags
& ATA_EFLAG_IS_IO
) {
1487 if (err_mask
& AC_ERR_HSM
)
1488 return base
+ ATA_ECAT_TOUT_HSM
;
1490 (AC_ERR_DEV
|AC_ERR_MEDIA
|AC_ERR_INVALID
)) == AC_ERR_DEV
)
1491 return base
+ ATA_ECAT_UNK_DEV
;
1497 struct speed_down_verdict_arg
{
1500 int nr_errors
[ATA_ECAT_NR
];
1503 static int speed_down_verdict_cb(struct ata_ering_entry
*ent
, void *void_arg
)
1505 struct speed_down_verdict_arg
*arg
= void_arg
;
1508 if (ent
->timestamp
< arg
->since
)
1511 cat
= ata_eh_categorize_error(ent
->eflags
, ent
->err_mask
,
1513 arg
->nr_errors
[cat
]++;
1519 * ata_eh_speed_down_verdict - Determine speed down verdict
1520 * @dev: Device of interest
1522 * This function examines error ring of @dev and determines
1523 * whether NCQ needs to be turned off, transfer speed should be
1524 * stepped down, or falling back to PIO is necessary.
1526 * ECAT_ATA_BUS : ATA_BUS error for any command
1528 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1531 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1533 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1534 * data transfer hasn't been verified.
1538 * NCQ_OFF : Turn off NCQ.
1540 * SPEED_DOWN : Speed down transfer speed but don't fall back
1543 * FALLBACK_TO_PIO : Fall back to PIO.
1545 * Even if multiple verdicts are returned, only one action is
1546 * taken per error. An action triggered by non-DUBIOUS errors
1547 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1548 * This is to expedite speed down decisions right after device is
1549 * initially configured.
1551 * The followings are speed down rules. #1 and #2 deal with
1554 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1555 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1557 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1558 * occurred during last 5 mins, NCQ_OFF.
1560 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1561 * ocurred during last 5 mins, FALLBACK_TO_PIO
1563 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1564 * during last 10 mins, NCQ_OFF.
1566 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1567 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1570 * Inherited from caller.
1573 * OR of ATA_EH_SPDN_* flags.
1575 static unsigned int ata_eh_speed_down_verdict(struct ata_device
*dev
)
1577 const u64 j5mins
= 5LLU * 60 * HZ
, j10mins
= 10LLU * 60 * HZ
;
1578 u64 j64
= get_jiffies_64();
1579 struct speed_down_verdict_arg arg
;
1580 unsigned int verdict
= 0;
1582 /* scan past 5 mins of error history */
1583 memset(&arg
, 0, sizeof(arg
));
1584 arg
.since
= j64
- min(j64
, j5mins
);
1585 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1587 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_ATA_BUS
] +
1588 arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] > 1)
1589 verdict
|= ATA_EH_SPDN_SPEED_DOWN
|
1590 ATA_EH_SPDN_FALLBACK_TO_PIO
| ATA_EH_SPDN_KEEP_ERRORS
;
1592 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] +
1593 arg
.nr_errors
[ATA_ECAT_DUBIOUS_UNK_DEV
] > 1)
1594 verdict
|= ATA_EH_SPDN_NCQ_OFF
| ATA_EH_SPDN_KEEP_ERRORS
;
1596 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1597 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1598 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1599 verdict
|= ATA_EH_SPDN_FALLBACK_TO_PIO
;
1601 /* scan past 10 mins of error history */
1602 memset(&arg
, 0, sizeof(arg
));
1603 arg
.since
= j64
- min(j64
, j10mins
);
1604 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1606 if (arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1607 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 3)
1608 verdict
|= ATA_EH_SPDN_NCQ_OFF
;
1610 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1611 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] > 3 ||
1612 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1613 verdict
|= ATA_EH_SPDN_SPEED_DOWN
;
1619 * ata_eh_speed_down - record error and speed down if necessary
1620 * @dev: Failed device
1621 * @eflags: mask of ATA_EFLAG_* flags
1622 * @err_mask: err_mask of the error
1624 * Record error and examine error history to determine whether
1625 * adjusting transmission speed is necessary. It also sets
1626 * transmission limits appropriately if such adjustment is
1630 * Kernel thread context (may sleep).
1633 * Determined recovery action.
1635 static unsigned int ata_eh_speed_down(struct ata_device
*dev
,
1636 unsigned int eflags
, unsigned int err_mask
)
1638 struct ata_link
*link
= dev
->link
;
1640 unsigned int verdict
;
1641 unsigned int action
= 0;
1643 /* don't bother if Cat-0 error */
1644 if (ata_eh_categorize_error(eflags
, err_mask
, &xfer_ok
) == 0)
1647 /* record error and determine whether speed down is necessary */
1648 ata_ering_record(&dev
->ering
, eflags
, err_mask
);
1649 verdict
= ata_eh_speed_down_verdict(dev
);
1652 if ((verdict
& ATA_EH_SPDN_NCQ_OFF
) &&
1653 (dev
->flags
& (ATA_DFLAG_PIO
| ATA_DFLAG_NCQ
|
1654 ATA_DFLAG_NCQ_OFF
)) == ATA_DFLAG_NCQ
) {
1655 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
1656 ata_dev_printk(dev
, KERN_WARNING
,
1657 "NCQ disabled due to excessive errors\n");
1662 if (verdict
& ATA_EH_SPDN_SPEED_DOWN
) {
1663 /* speed down SATA link speed if possible */
1664 if (sata_down_spd_limit(link
) == 0) {
1665 action
|= ATA_EH_RESET
;
1669 /* lower transfer mode */
1670 if (dev
->spdn_cnt
< 2) {
1671 static const int dma_dnxfer_sel
[] =
1672 { ATA_DNXFER_DMA
, ATA_DNXFER_40C
};
1673 static const int pio_dnxfer_sel
[] =
1674 { ATA_DNXFER_PIO
, ATA_DNXFER_FORCE_PIO0
};
1677 if (dev
->xfer_shift
!= ATA_SHIFT_PIO
)
1678 sel
= dma_dnxfer_sel
[dev
->spdn_cnt
];
1680 sel
= pio_dnxfer_sel
[dev
->spdn_cnt
];
1684 if (ata_down_xfermask_limit(dev
, sel
) == 0) {
1685 action
|= ATA_EH_RESET
;
1691 /* Fall back to PIO? Slowing down to PIO is meaningless for
1692 * SATA ATA devices. Consider it only for PATA and SATAPI.
1694 if ((verdict
& ATA_EH_SPDN_FALLBACK_TO_PIO
) && (dev
->spdn_cnt
>= 2) &&
1695 (link
->ap
->cbl
!= ATA_CBL_SATA
|| dev
->class == ATA_DEV_ATAPI
) &&
1696 (dev
->xfer_shift
!= ATA_SHIFT_PIO
)) {
1697 if (ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO
) == 0) {
1699 action
|= ATA_EH_RESET
;
1706 /* device has been slowed down, blow error history */
1707 if (!(verdict
& ATA_EH_SPDN_KEEP_ERRORS
))
1708 ata_ering_clear(&dev
->ering
);
1713 * ata_eh_link_autopsy - analyze error and determine recovery action
1714 * @link: host link to perform autopsy on
1716 * Analyze why @link failed and determine which recovery actions
1717 * are needed. This function also sets more detailed AC_ERR_*
1718 * values and fills sense data for ATAPI CHECK SENSE.
1721 * Kernel thread context (may sleep).
1723 static void ata_eh_link_autopsy(struct ata_link
*link
)
1725 struct ata_port
*ap
= link
->ap
;
1726 struct ata_eh_context
*ehc
= &link
->eh_context
;
1727 struct ata_device
*dev
;
1728 unsigned int all_err_mask
= 0, eflags
= 0;
1735 if (ehc
->i
.flags
& ATA_EHI_NO_AUTOPSY
)
1738 /* obtain and analyze SError */
1739 rc
= sata_scr_read(link
, SCR_ERROR
, &serror
);
1741 ehc
->i
.serror
|= serror
;
1742 ata_eh_analyze_serror(link
);
1743 } else if (rc
!= -EOPNOTSUPP
) {
1744 /* SError read failed, force reset and probing */
1745 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
1746 ehc
->i
.action
|= ATA_EH_RESET
;
1747 ehc
->i
.err_mask
|= AC_ERR_OTHER
;
1750 /* analyze NCQ failure */
1751 ata_eh_analyze_ncq_error(link
);
1753 /* any real error trumps AC_ERR_OTHER */
1754 if (ehc
->i
.err_mask
& ~AC_ERR_OTHER
)
1755 ehc
->i
.err_mask
&= ~AC_ERR_OTHER
;
1757 all_err_mask
|= ehc
->i
.err_mask
;
1759 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1760 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
1762 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) || qc
->dev
->link
!= link
)
1765 /* inherit upper level err_mask */
1766 qc
->err_mask
|= ehc
->i
.err_mask
;
1769 ehc
->i
.action
|= ata_eh_analyze_tf(qc
, &qc
->result_tf
);
1771 /* DEV errors are probably spurious in case of ATA_BUS error */
1772 if (qc
->err_mask
& AC_ERR_ATA_BUS
)
1773 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_MEDIA
|
1776 /* any real error trumps unknown error */
1777 if (qc
->err_mask
& ~AC_ERR_OTHER
)
1778 qc
->err_mask
&= ~AC_ERR_OTHER
;
1780 /* SENSE_VALID trumps dev/unknown error and revalidation */
1781 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
1782 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_OTHER
);
1784 /* determine whether the command is worth retrying */
1785 if (!(qc
->err_mask
& AC_ERR_INVALID
) &&
1786 ((qc
->flags
& ATA_QCFLAG_IO
) || qc
->err_mask
!= AC_ERR_DEV
))
1787 qc
->flags
|= ATA_QCFLAG_RETRY
;
1789 /* accumulate error info */
1790 ehc
->i
.dev
= qc
->dev
;
1791 all_err_mask
|= qc
->err_mask
;
1792 if (qc
->flags
& ATA_QCFLAG_IO
)
1793 eflags
|= ATA_EFLAG_IS_IO
;
1796 /* enforce default EH actions */
1797 if (ap
->pflags
& ATA_PFLAG_FROZEN
||
1798 all_err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
))
1799 ehc
->i
.action
|= ATA_EH_RESET
;
1800 else if (((eflags
& ATA_EFLAG_IS_IO
) && all_err_mask
) ||
1801 (!(eflags
& ATA_EFLAG_IS_IO
) && (all_err_mask
& ~AC_ERR_DEV
)))
1802 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
1804 /* If we have offending qcs and the associated failed device,
1805 * perform per-dev EH action only on the offending device.
1808 ehc
->i
.dev_action
[ehc
->i
.dev
->devno
] |=
1809 ehc
->i
.action
& ATA_EH_PERDEV_MASK
;
1810 ehc
->i
.action
&= ~ATA_EH_PERDEV_MASK
;
1813 /* propagate timeout to host link */
1814 if ((all_err_mask
& AC_ERR_TIMEOUT
) && !ata_is_host_link(link
))
1815 ap
->link
.eh_context
.i
.err_mask
|= AC_ERR_TIMEOUT
;
1817 /* record error and consider speeding down */
1819 if (!dev
&& ((ata_link_max_devices(link
) == 1 &&
1820 ata_dev_enabled(link
->device
))))
1824 if (dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)
1825 eflags
|= ATA_EFLAG_DUBIOUS_XFER
;
1826 ehc
->i
.action
|= ata_eh_speed_down(dev
, eflags
, all_err_mask
);
1833 * ata_eh_autopsy - analyze error and determine recovery action
1834 * @ap: host port to perform autopsy on
1836 * Analyze all links of @ap and determine why they failed and
1837 * which recovery actions are needed.
1840 * Kernel thread context (may sleep).
1842 void ata_eh_autopsy(struct ata_port
*ap
)
1844 struct ata_link
*link
;
1846 ata_port_for_each_link(link
, ap
)
1847 ata_eh_link_autopsy(link
);
1849 /* Autopsy of fanout ports can affect host link autopsy.
1850 * Perform host link autopsy last.
1852 if (sata_pmp_attached(ap
))
1853 ata_eh_link_autopsy(&ap
->link
);
1857 * ata_eh_link_report - report error handling to user
1858 * @link: ATA link EH is going on
1860 * Report EH to user.
1865 static void ata_eh_link_report(struct ata_link
*link
)
1867 struct ata_port
*ap
= link
->ap
;
1868 struct ata_eh_context
*ehc
= &link
->eh_context
;
1869 const char *frozen
, *desc
;
1871 int tag
, nr_failed
= 0;
1873 if (ehc
->i
.flags
& ATA_EHI_QUIET
)
1877 if (ehc
->i
.desc
[0] != '\0')
1880 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1881 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
1883 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) || qc
->dev
->link
!= link
||
1884 ((qc
->flags
& ATA_QCFLAG_QUIET
) &&
1885 qc
->err_mask
== AC_ERR_DEV
))
1887 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
&& !qc
->err_mask
)
1893 if (!nr_failed
&& !ehc
->i
.err_mask
)
1897 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1900 memset(tries_buf
, 0, sizeof(tries_buf
));
1901 if (ap
->eh_tries
< ATA_EH_MAX_TRIES
)
1902 snprintf(tries_buf
, sizeof(tries_buf
) - 1, " t%d",
1906 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "exception Emask 0x%x "
1907 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
1908 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
1909 ehc
->i
.action
, frozen
, tries_buf
);
1911 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "%s\n", desc
);
1913 ata_link_printk(link
, KERN_ERR
, "exception Emask 0x%x "
1914 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
1915 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
1916 ehc
->i
.action
, frozen
, tries_buf
);
1918 ata_link_printk(link
, KERN_ERR
, "%s\n", desc
);
1922 ata_port_printk(ap
, KERN_ERR
,
1923 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
1924 ehc
->i
.serror
& SERR_DATA_RECOVERED
? "RecovData " : "",
1925 ehc
->i
.serror
& SERR_COMM_RECOVERED
? "RecovComm " : "",
1926 ehc
->i
.serror
& SERR_DATA
? "UnrecovData " : "",
1927 ehc
->i
.serror
& SERR_PERSISTENT
? "Persist " : "",
1928 ehc
->i
.serror
& SERR_PROTOCOL
? "Proto " : "",
1929 ehc
->i
.serror
& SERR_INTERNAL
? "HostInt " : "",
1930 ehc
->i
.serror
& SERR_PHYRDY_CHG
? "PHYRdyChg " : "",
1931 ehc
->i
.serror
& SERR_PHY_INT_ERR
? "PHYInt " : "",
1932 ehc
->i
.serror
& SERR_COMM_WAKE
? "CommWake " : "",
1933 ehc
->i
.serror
& SERR_10B_8B_ERR
? "10B8B " : "",
1934 ehc
->i
.serror
& SERR_DISPARITY
? "Dispar " : "",
1935 ehc
->i
.serror
& SERR_CRC
? "BadCRC " : "",
1936 ehc
->i
.serror
& SERR_HANDSHAKE
? "Handshk " : "",
1937 ehc
->i
.serror
& SERR_LINK_SEQ_ERR
? "LinkSeq " : "",
1938 ehc
->i
.serror
& SERR_TRANS_ST_ERROR
? "TrStaTrns " : "",
1939 ehc
->i
.serror
& SERR_UNRECOG_FIS
? "UnrecFIS " : "",
1940 ehc
->i
.serror
& SERR_DEV_XCHG
? "DevExch " : "");
1942 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1943 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
1944 struct ata_taskfile
*cmd
= &qc
->tf
, *res
= &qc
->result_tf
;
1945 const u8
*cdb
= qc
->cdb
;
1946 char data_buf
[20] = "";
1947 char cdb_buf
[70] = "";
1949 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
1950 qc
->dev
->link
!= link
|| !qc
->err_mask
)
1953 if (qc
->dma_dir
!= DMA_NONE
) {
1954 static const char *dma_str
[] = {
1955 [DMA_BIDIRECTIONAL
] = "bidi",
1956 [DMA_TO_DEVICE
] = "out",
1957 [DMA_FROM_DEVICE
] = "in",
1959 static const char *prot_str
[] = {
1960 [ATA_PROT_PIO
] = "pio",
1961 [ATA_PROT_DMA
] = "dma",
1962 [ATA_PROT_NCQ
] = "ncq",
1963 [ATAPI_PROT_PIO
] = "pio",
1964 [ATAPI_PROT_DMA
] = "dma",
1967 snprintf(data_buf
, sizeof(data_buf
), " %s %u %s",
1968 prot_str
[qc
->tf
.protocol
], qc
->nbytes
,
1969 dma_str
[qc
->dma_dir
]);
1972 if (ata_is_atapi(qc
->tf
.protocol
))
1973 snprintf(cdb_buf
, sizeof(cdb_buf
),
1974 "cdb %02x %02x %02x %02x %02x %02x %02x %02x "
1975 "%02x %02x %02x %02x %02x %02x %02x %02x\n ",
1976 cdb
[0], cdb
[1], cdb
[2], cdb
[3],
1977 cdb
[4], cdb
[5], cdb
[6], cdb
[7],
1978 cdb
[8], cdb
[9], cdb
[10], cdb
[11],
1979 cdb
[12], cdb
[13], cdb
[14], cdb
[15]);
1981 ata_dev_printk(qc
->dev
, KERN_ERR
,
1982 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
1984 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
1985 "Emask 0x%x (%s)%s\n",
1986 cmd
->command
, cmd
->feature
, cmd
->nsect
,
1987 cmd
->lbal
, cmd
->lbam
, cmd
->lbah
,
1988 cmd
->hob_feature
, cmd
->hob_nsect
,
1989 cmd
->hob_lbal
, cmd
->hob_lbam
, cmd
->hob_lbah
,
1990 cmd
->device
, qc
->tag
, data_buf
, cdb_buf
,
1991 res
->command
, res
->feature
, res
->nsect
,
1992 res
->lbal
, res
->lbam
, res
->lbah
,
1993 res
->hob_feature
, res
->hob_nsect
,
1994 res
->hob_lbal
, res
->hob_lbam
, res
->hob_lbah
,
1995 res
->device
, qc
->err_mask
, ata_err_string(qc
->err_mask
),
1996 qc
->err_mask
& AC_ERR_NCQ
? " <F>" : "");
1998 if (res
->command
& (ATA_BUSY
| ATA_DRDY
| ATA_DF
| ATA_DRQ
|
2000 if (res
->command
& ATA_BUSY
)
2001 ata_dev_printk(qc
->dev
, KERN_ERR
,
2002 "status: { Busy }\n");
2004 ata_dev_printk(qc
->dev
, KERN_ERR
,
2005 "status: { %s%s%s%s}\n",
2006 res
->command
& ATA_DRDY
? "DRDY " : "",
2007 res
->command
& ATA_DF
? "DF " : "",
2008 res
->command
& ATA_DRQ
? "DRQ " : "",
2009 res
->command
& ATA_ERR
? "ERR " : "");
2012 if (cmd
->command
!= ATA_CMD_PACKET
&&
2013 (res
->feature
& (ATA_ICRC
| ATA_UNC
| ATA_IDNF
|
2015 ata_dev_printk(qc
->dev
, KERN_ERR
,
2016 "error: { %s%s%s%s}\n",
2017 res
->feature
& ATA_ICRC
? "ICRC " : "",
2018 res
->feature
& ATA_UNC
? "UNC " : "",
2019 res
->feature
& ATA_IDNF
? "IDNF " : "",
2020 res
->feature
& ATA_ABORTED
? "ABRT " : "");
2025 * ata_eh_report - report error handling to user
2026 * @ap: ATA port to report EH about
2028 * Report EH to user.
2033 void ata_eh_report(struct ata_port
*ap
)
2035 struct ata_link
*link
;
2037 __ata_port_for_each_link(link
, ap
)
2038 ata_eh_link_report(link
);
2041 static int ata_do_reset(struct ata_link
*link
, ata_reset_fn_t reset
,
2042 unsigned int *classes
, unsigned long deadline
)
2044 struct ata_device
*dev
;
2046 ata_link_for_each_dev(dev
, link
)
2047 classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
2049 return reset(link
, classes
, deadline
);
2052 static int ata_eh_followup_srst_needed(struct ata_link
*link
,
2053 int rc
, int classify
,
2054 const unsigned int *classes
)
2056 if ((link
->flags
& ATA_LFLAG_NO_SRST
) || ata_link_offline(link
))
2058 if (rc
== -EAGAIN
) {
2065 if (sata_pmp_supported(link
->ap
) && ata_is_host_link(link
))
2070 int ata_eh_reset(struct ata_link
*link
, int classify
,
2071 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
2072 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
2074 const int max_tries
= ARRAY_SIZE(ata_eh_reset_timeouts
);
2075 struct ata_port
*ap
= link
->ap
;
2076 struct ata_eh_context
*ehc
= &link
->eh_context
;
2077 unsigned int *classes
= ehc
->classes
;
2078 unsigned int lflags
= link
->flags
;
2079 int verbose
= !(ehc
->i
.flags
& ATA_EHI_QUIET
);
2081 struct ata_device
*dev
;
2082 unsigned long deadline
, now
;
2083 ata_reset_fn_t reset
;
2084 unsigned long flags
;
2091 spin_lock_irqsave(ap
->lock
, flags
);
2092 ap
->pflags
|= ATA_PFLAG_RESETTING
;
2093 spin_unlock_irqrestore(ap
->lock
, flags
);
2095 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2097 ata_link_for_each_dev(dev
, link
) {
2098 /* If we issue an SRST then an ATA drive (not ATAPI)
2099 * may change configuration and be in PIO0 timing. If
2100 * we do a hard reset (or are coming from power on)
2101 * this is true for ATA or ATAPI. Until we've set a
2102 * suitable controller mode we should not touch the
2103 * bus as we may be talking too fast.
2105 dev
->pio_mode
= XFER_PIO_0
;
2107 /* If the controller has a pio mode setup function
2108 * then use it to set the chipset to rights. Don't
2109 * touch the DMA setup as that will be dealt with when
2110 * configuring devices.
2112 if (ap
->ops
->set_piomode
)
2113 ap
->ops
->set_piomode(ap
, dev
);
2116 /* prefer hardreset */
2118 ehc
->i
.action
&= ~ATA_EH_RESET
;
2121 ehc
->i
.action
= ATA_EH_HARDRESET
;
2122 } else if (softreset
) {
2124 ehc
->i
.action
= ATA_EH_SOFTRESET
;
2129 ata_deadline(jiffies
, ATA_EH_PRERESET_TIMEOUT
));
2131 if (rc
== -ENOENT
) {
2132 ata_link_printk(link
, KERN_DEBUG
,
2133 "port disabled. ignoring.\n");
2134 ehc
->i
.action
&= ~ATA_EH_RESET
;
2136 ata_link_for_each_dev(dev
, link
)
2137 classes
[dev
->devno
] = ATA_DEV_NONE
;
2141 ata_link_printk(link
, KERN_ERR
,
2142 "prereset failed (errno=%d)\n", rc
);
2146 /* prereset() might have cleared ATA_EH_RESET. If so,
2147 * bang classes and return.
2149 if (reset
&& !(ehc
->i
.action
& ATA_EH_RESET
)) {
2150 ata_link_for_each_dev(dev
, link
)
2151 classes
[dev
->devno
] = ATA_DEV_NONE
;
2161 if (ata_is_host_link(link
))
2162 ata_eh_freeze_port(ap
);
2164 deadline
= ata_deadline(jiffies
, ata_eh_reset_timeouts
[try++]);
2168 ata_link_printk(link
, KERN_INFO
, "%s resetting link\n",
2169 reset
== softreset
? "soft" : "hard");
2171 /* mark that this EH session started with reset */
2172 if (reset
== hardreset
)
2173 ehc
->i
.flags
|= ATA_EHI_DID_HARDRESET
;
2175 ehc
->i
.flags
|= ATA_EHI_DID_SOFTRESET
;
2177 rc
= ata_do_reset(link
, reset
, classes
, deadline
);
2179 if (reset
== hardreset
&&
2180 ata_eh_followup_srst_needed(link
, rc
, classify
, classes
)) {
2181 /* okay, let's do follow-up softreset */
2185 ata_link_printk(link
, KERN_ERR
,
2186 "follow-up softreset required "
2187 "but no softreset avaliable\n");
2192 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2193 rc
= ata_do_reset(link
, reset
, classes
, deadline
);
2196 /* -EAGAIN can happen if we skipped followup SRST */
2197 if (rc
&& rc
!= -EAGAIN
)
2201 ata_link_printk(link
, KERN_INFO
, "no reset method "
2202 "available, skipping reset\n");
2203 if (!(lflags
& ATA_LFLAG_ASSUME_CLASS
))
2204 lflags
|= ATA_LFLAG_ASSUME_ATA
;
2208 * Post-reset processing
2210 ata_link_for_each_dev(dev
, link
) {
2211 /* After the reset, the device state is PIO 0 and the
2212 * controller state is undefined. Reset also wakes up
2213 * drives from sleeping mode.
2215 dev
->pio_mode
= XFER_PIO_0
;
2216 dev
->flags
&= ~ATA_DFLAG_SLEEPING
;
2218 if (ata_link_offline(link
))
2221 /* apply class override */
2222 if (lflags
& ATA_LFLAG_ASSUME_ATA
)
2223 classes
[dev
->devno
] = ATA_DEV_ATA
;
2224 else if (lflags
& ATA_LFLAG_ASSUME_SEMB
)
2225 classes
[dev
->devno
] = ATA_DEV_SEMB_UNSUP
; /* not yet */
2228 /* record current link speed */
2229 if (sata_scr_read(link
, SCR_STATUS
, &sstatus
) == 0)
2230 link
->sata_spd
= (sstatus
>> 4) & 0xf;
2233 if (ata_is_host_link(link
))
2234 ata_eh_thaw_port(ap
);
2236 /* postreset() should clear hardware SError. Although SError
2237 * is cleared during link resume, clearing SError here is
2238 * necessary as some PHYs raise hotplug events after SRST.
2239 * This introduces race condition where hotplug occurs between
2240 * reset and here. This race is mediated by cross checking
2241 * link onlineness and classification result later.
2244 postreset(link
, classes
);
2246 /* clear cached SError */
2247 spin_lock_irqsave(link
->ap
->lock
, flags
);
2248 link
->eh_info
.serror
= 0;
2249 spin_unlock_irqrestore(link
->ap
->lock
, flags
);
2251 /* Make sure onlineness and classification result correspond.
2252 * Hotplug could have happened during reset and some
2253 * controllers fail to wait while a drive is spinning up after
2254 * being hotplugged causing misdetection. By cross checking
2255 * link onlineness and classification result, those conditions
2256 * can be reliably detected and retried.
2259 ata_link_for_each_dev(dev
, link
) {
2260 /* convert all ATA_DEV_UNKNOWN to ATA_DEV_NONE */
2261 if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
)
2262 classes
[dev
->devno
] = ATA_DEV_NONE
;
2267 if (classify
&& !nr_known
&& ata_link_online(link
)) {
2268 if (try < max_tries
) {
2269 ata_link_printk(link
, KERN_WARNING
, "link online but "
2270 "device misclassified, retrying\n");
2274 ata_link_printk(link
, KERN_WARNING
,
2275 "link online but device misclassified, "
2276 "device detection might fail\n");
2279 /* reset successful, schedule revalidation */
2280 ata_eh_done(link
, NULL
, ATA_EH_RESET
);
2281 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2285 /* clear hotplug flag */
2286 ehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2288 spin_lock_irqsave(ap
->lock
, flags
);
2289 ap
->pflags
&= ~ATA_PFLAG_RESETTING
;
2290 spin_unlock_irqrestore(ap
->lock
, flags
);
2295 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2296 if (!ata_is_host_link(link
) &&
2297 sata_scr_read(link
, SCR_STATUS
, &sstatus
))
2300 if (rc
== -ERESTART
|| try >= max_tries
)
2304 if (time_before(now
, deadline
)) {
2305 unsigned long delta
= deadline
- now
;
2307 ata_link_printk(link
, KERN_WARNING
, "reset failed "
2308 "(errno=%d), retrying in %u secs\n",
2309 rc
, (jiffies_to_msecs(delta
) + 999) / 1000);
2312 delta
= schedule_timeout_uninterruptible(delta
);
2315 if (rc
== -EPIPE
|| try == max_tries
- 1)
2316 sata_down_spd_limit(link
);
2322 static int ata_eh_revalidate_and_attach(struct ata_link
*link
,
2323 struct ata_device
**r_failed_dev
)
2325 struct ata_port
*ap
= link
->ap
;
2326 struct ata_eh_context
*ehc
= &link
->eh_context
;
2327 struct ata_device
*dev
;
2328 unsigned int new_mask
= 0;
2329 unsigned long flags
;
2334 /* For PATA drive side cable detection to work, IDENTIFY must
2335 * be done backwards such that PDIAG- is released by the slave
2336 * device before the master device is identified.
2338 ata_link_for_each_dev_reverse(dev
, link
) {
2339 unsigned int action
= ata_eh_dev_action(dev
);
2340 unsigned int readid_flags
= 0;
2342 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
2343 readid_flags
|= ATA_READID_POSTRESET
;
2345 if ((action
& ATA_EH_REVALIDATE
) && ata_dev_enabled(dev
)) {
2346 WARN_ON(dev
->class == ATA_DEV_PMP
);
2348 if (ata_link_offline(link
)) {
2353 ata_eh_about_to_do(link
, dev
, ATA_EH_REVALIDATE
);
2354 rc
= ata_dev_revalidate(dev
, ehc
->classes
[dev
->devno
],
2359 ata_eh_done(link
, dev
, ATA_EH_REVALIDATE
);
2361 /* Configuration may have changed, reconfigure
2364 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
2366 /* schedule the scsi_rescan_device() here */
2367 queue_work(ata_aux_wq
, &(ap
->scsi_rescan_task
));
2368 } else if (dev
->class == ATA_DEV_UNKNOWN
&&
2369 ehc
->tries
[dev
->devno
] &&
2370 ata_class_enabled(ehc
->classes
[dev
->devno
])) {
2371 dev
->class = ehc
->classes
[dev
->devno
];
2373 if (dev
->class == ATA_DEV_PMP
)
2374 rc
= sata_pmp_attach(dev
);
2376 rc
= ata_dev_read_id(dev
, &dev
->class,
2377 readid_flags
, dev
->id
);
2380 new_mask
|= 1 << dev
->devno
;
2383 /* IDENTIFY was issued to non-existent
2384 * device. No need to reset. Just
2385 * thaw and kill the device.
2387 ata_eh_thaw_port(ap
);
2388 dev
->class = ATA_DEV_UNKNOWN
;
2391 dev
->class = ATA_DEV_UNKNOWN
;
2397 /* PDIAG- should have been released, ask cable type if post-reset */
2398 if ((ehc
->i
.flags
& ATA_EHI_DID_RESET
) && ata_is_host_link(link
)) {
2399 if (ap
->ops
->cable_detect
)
2400 ap
->cbl
= ap
->ops
->cable_detect(ap
);
2404 /* Configure new devices forward such that user doesn't see
2405 * device detection messages backwards.
2407 ata_link_for_each_dev(dev
, link
) {
2408 if (!(new_mask
& (1 << dev
->devno
)) ||
2409 dev
->class == ATA_DEV_PMP
)
2412 ehc
->i
.flags
|= ATA_EHI_PRINTINFO
;
2413 rc
= ata_dev_configure(dev
);
2414 ehc
->i
.flags
&= ~ATA_EHI_PRINTINFO
;
2418 spin_lock_irqsave(ap
->lock
, flags
);
2419 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
2420 spin_unlock_irqrestore(ap
->lock
, flags
);
2422 /* new device discovered, configure xfermode */
2423 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
2429 *r_failed_dev
= dev
;
2430 DPRINTK("EXIT rc=%d\n", rc
);
2435 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2436 * @link: link on which timings will be programmed
2437 * @r_failed_dev: out paramter for failed device
2439 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2440 * ata_set_mode() fails, pointer to the failing device is
2441 * returned in @r_failed_dev.
2444 * PCI/etc. bus probe sem.
2447 * 0 on success, negative errno otherwise
2449 int ata_set_mode(struct ata_link
*link
, struct ata_device
**r_failed_dev
)
2451 struct ata_port
*ap
= link
->ap
;
2452 struct ata_device
*dev
;
2455 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
2456 ata_link_for_each_dev(dev
, link
) {
2457 if (!(dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)) {
2458 struct ata_ering_entry
*ent
;
2460 ent
= ata_ering_top(&dev
->ering
);
2462 ent
->eflags
&= ~ATA_EFLAG_DUBIOUS_XFER
;
2466 /* has private set_mode? */
2467 if (ap
->ops
->set_mode
)
2468 rc
= ap
->ops
->set_mode(link
, r_failed_dev
);
2470 rc
= ata_do_set_mode(link
, r_failed_dev
);
2472 /* if transfer mode has changed, set DUBIOUS_XFER on device */
2473 ata_link_for_each_dev(dev
, link
) {
2474 struct ata_eh_context
*ehc
= &link
->eh_context
;
2475 u8 saved_xfer_mode
= ehc
->saved_xfer_mode
[dev
->devno
];
2476 u8 saved_ncq
= !!(ehc
->saved_ncq_enabled
& (1 << dev
->devno
));
2478 if (dev
->xfer_mode
!= saved_xfer_mode
||
2479 ata_ncq_enabled(dev
) != saved_ncq
)
2480 dev
->flags
|= ATA_DFLAG_DUBIOUS_XFER
;
2486 static int ata_link_nr_enabled(struct ata_link
*link
)
2488 struct ata_device
*dev
;
2491 ata_link_for_each_dev(dev
, link
)
2492 if (ata_dev_enabled(dev
))
2497 static int ata_link_nr_vacant(struct ata_link
*link
)
2499 struct ata_device
*dev
;
2502 ata_link_for_each_dev(dev
, link
)
2503 if (dev
->class == ATA_DEV_UNKNOWN
)
2508 static int ata_eh_skip_recovery(struct ata_link
*link
)
2510 struct ata_port
*ap
= link
->ap
;
2511 struct ata_eh_context
*ehc
= &link
->eh_context
;
2512 struct ata_device
*dev
;
2514 /* skip disabled links */
2515 if (link
->flags
& ATA_LFLAG_DISABLED
)
2518 /* thaw frozen port and recover failed devices */
2519 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) || ata_link_nr_enabled(link
))
2522 /* reset at least once if reset is requested */
2523 if ((ehc
->i
.action
& ATA_EH_RESET
) &&
2524 !(ehc
->i
.flags
& ATA_EHI_DID_RESET
))
2527 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
2528 ata_link_for_each_dev(dev
, link
) {
2529 if (dev
->class == ATA_DEV_UNKNOWN
&&
2530 ehc
->classes
[dev
->devno
] != ATA_DEV_NONE
)
2537 static int ata_eh_schedule_probe(struct ata_device
*dev
)
2539 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
2541 if (!(ehc
->i
.probe_mask
& (1 << dev
->devno
)) ||
2542 (ehc
->did_probe_mask
& (1 << dev
->devno
)))
2545 ata_eh_detach_dev(dev
);
2547 ehc
->did_probe_mask
|= (1 << dev
->devno
);
2548 ehc
->i
.action
|= ATA_EH_RESET
;
2549 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
2550 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
2555 static int ata_eh_handle_dev_fail(struct ata_device
*dev
, int err
)
2557 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
2559 ehc
->tries
[dev
->devno
]--;
2563 /* device missing or wrong IDENTIFY data, schedule probing */
2564 ehc
->i
.probe_mask
|= (1 << dev
->devno
);
2566 /* give it just one more chance */
2567 ehc
->tries
[dev
->devno
] = min(ehc
->tries
[dev
->devno
], 1);
2569 if (ehc
->tries
[dev
->devno
] == 1 && dev
->pio_mode
> XFER_PIO_0
) {
2570 /* This is the last chance, better to slow
2571 * down than lose it.
2573 sata_down_spd_limit(dev
->link
);
2574 ata_down_xfermask_limit(dev
, ATA_DNXFER_PIO
);
2578 if (ata_dev_enabled(dev
) && !ehc
->tries
[dev
->devno
]) {
2579 /* disable device if it has used up all its chances */
2580 ata_dev_disable(dev
);
2582 /* detach if offline */
2583 if (ata_link_offline(dev
->link
))
2584 ata_eh_detach_dev(dev
);
2586 /* schedule probe if necessary */
2587 if (ata_eh_schedule_probe(dev
))
2588 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
2592 ehc
->i
.action
|= ATA_EH_RESET
;
2598 * ata_eh_recover - recover host port after error
2599 * @ap: host port to recover
2600 * @prereset: prereset method (can be NULL)
2601 * @softreset: softreset method (can be NULL)
2602 * @hardreset: hardreset method (can be NULL)
2603 * @postreset: postreset method (can be NULL)
2604 * @r_failed_link: out parameter for failed link
2606 * This is the alpha and omega, eum and yang, heart and soul of
2607 * libata exception handling. On entry, actions required to
2608 * recover each link and hotplug requests are recorded in the
2609 * link's eh_context. This function executes all the operations
2610 * with appropriate retrials and fallbacks to resurrect failed
2611 * devices, detach goners and greet newcomers.
2614 * Kernel thread context (may sleep).
2617 * 0 on success, -errno on failure.
2619 int ata_eh_recover(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
2620 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2621 ata_postreset_fn_t postreset
,
2622 struct ata_link
**r_failed_link
)
2624 struct ata_link
*link
;
2625 struct ata_device
*dev
;
2626 int nr_failed_devs
, nr_disabled_devs
;
2628 unsigned long flags
;
2632 /* prep for recovery */
2633 ata_port_for_each_link(link
, ap
) {
2634 struct ata_eh_context
*ehc
= &link
->eh_context
;
2636 /* re-enable link? */
2637 if (ehc
->i
.action
& ATA_EH_ENABLE_LINK
) {
2638 ata_eh_about_to_do(link
, NULL
, ATA_EH_ENABLE_LINK
);
2639 spin_lock_irqsave(ap
->lock
, flags
);
2640 link
->flags
&= ~ATA_LFLAG_DISABLED
;
2641 spin_unlock_irqrestore(ap
->lock
, flags
);
2642 ata_eh_done(link
, NULL
, ATA_EH_ENABLE_LINK
);
2645 ata_link_for_each_dev(dev
, link
) {
2646 if (link
->flags
& ATA_LFLAG_NO_RETRY
)
2647 ehc
->tries
[dev
->devno
] = 1;
2649 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
2651 /* collect port action mask recorded in dev actions */
2652 ehc
->i
.action
|= ehc
->i
.dev_action
[dev
->devno
] &
2653 ~ATA_EH_PERDEV_MASK
;
2654 ehc
->i
.dev_action
[dev
->devno
] &= ATA_EH_PERDEV_MASK
;
2656 /* process hotplug request */
2657 if (dev
->flags
& ATA_DFLAG_DETACH
)
2658 ata_eh_detach_dev(dev
);
2660 /* schedule probe if necessary */
2661 if (!ata_dev_enabled(dev
))
2662 ata_eh_schedule_probe(dev
);
2669 nr_disabled_devs
= 0;
2671 /* if UNLOADING, finish immediately */
2672 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
2676 ata_port_for_each_link(link
, ap
) {
2677 struct ata_eh_context
*ehc
= &link
->eh_context
;
2679 /* skip EH if possible. */
2680 if (ata_eh_skip_recovery(link
))
2683 ata_link_for_each_dev(dev
, link
)
2684 ehc
->classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
2688 ata_port_for_each_link(link
, ap
) {
2689 struct ata_eh_context
*ehc
= &link
->eh_context
;
2691 if (!(ehc
->i
.action
& ATA_EH_RESET
))
2694 rc
= ata_eh_reset(link
, ata_link_nr_vacant(link
),
2695 prereset
, softreset
, hardreset
, postreset
);
2697 ata_link_printk(link
, KERN_ERR
,
2698 "reset failed, giving up\n");
2704 ata_port_for_each_link(link
, ap
) {
2705 struct ata_eh_context
*ehc
= &link
->eh_context
;
2707 /* revalidate existing devices and attach new ones */
2708 rc
= ata_eh_revalidate_and_attach(link
, &dev
);
2712 /* if PMP got attached, return, pmp EH will take care of it */
2713 if (link
->device
->class == ATA_DEV_PMP
) {
2718 /* configure transfer mode if necessary */
2719 if (ehc
->i
.flags
& ATA_EHI_SETMODE
) {
2720 rc
= ata_set_mode(link
, &dev
);
2723 ehc
->i
.flags
&= ~ATA_EHI_SETMODE
;
2726 if (ehc
->i
.action
& ATA_EH_LPM
)
2727 ata_link_for_each_dev(dev
, link
)
2728 ata_dev_enable_pm(dev
, ap
->pm_policy
);
2730 /* this link is okay now */
2736 if (ata_eh_handle_dev_fail(dev
, rc
))
2739 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
2740 /* PMP reset requires working host port.
2741 * Can't retry if it's frozen.
2743 if (sata_pmp_attached(ap
))
2749 if (nr_failed_devs
) {
2750 if (nr_failed_devs
!= nr_disabled_devs
) {
2751 ata_port_printk(ap
, KERN_WARNING
, "failed to recover "
2752 "some devices, retrying in 5 secs\n");
2755 /* no device left to recover, repeat fast */
2763 if (rc
&& r_failed_link
)
2764 *r_failed_link
= link
;
2766 DPRINTK("EXIT, rc=%d\n", rc
);
2771 * ata_eh_finish - finish up EH
2772 * @ap: host port to finish EH for
2774 * Recovery is complete. Clean up EH states and retry or finish
2780 void ata_eh_finish(struct ata_port
*ap
)
2784 /* retry or finish qcs */
2785 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2786 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2788 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
2792 /* FIXME: Once EH migration is complete,
2793 * generate sense data in this function,
2794 * considering both err_mask and tf.
2796 if (qc
->flags
& ATA_QCFLAG_RETRY
)
2797 ata_eh_qc_retry(qc
);
2799 ata_eh_qc_complete(qc
);
2801 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
2802 ata_eh_qc_complete(qc
);
2804 /* feed zero TF to sense generation */
2805 memset(&qc
->result_tf
, 0, sizeof(qc
->result_tf
));
2806 ata_eh_qc_retry(qc
);
2811 /* make sure nr_active_links is zero after EH */
2812 WARN_ON(ap
->nr_active_links
);
2813 ap
->nr_active_links
= 0;
2817 * ata_do_eh - do standard error handling
2818 * @ap: host port to handle error for
2820 * @prereset: prereset method (can be NULL)
2821 * @softreset: softreset method (can be NULL)
2822 * @hardreset: hardreset method (can be NULL)
2823 * @postreset: postreset method (can be NULL)
2825 * Perform standard error handling sequence.
2828 * Kernel thread context (may sleep).
2830 void ata_do_eh(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
2831 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2832 ata_postreset_fn_t postreset
)
2834 struct ata_device
*dev
;
2840 rc
= ata_eh_recover(ap
, prereset
, softreset
, hardreset
, postreset
,
2843 ata_link_for_each_dev(dev
, &ap
->link
)
2844 ata_dev_disable(dev
);
2851 * ata_std_error_handler - standard error handler
2852 * @ap: host port to handle error for
2854 * Standard error handler
2857 * Kernel thread context (may sleep).
2859 void ata_std_error_handler(struct ata_port
*ap
)
2861 struct ata_port_operations
*ops
= ap
->ops
;
2862 ata_reset_fn_t hardreset
= ops
->hardreset
;
2864 /* ignore built-in hardreset if SCR access is not available */
2865 if (ata_is_builtin_hardreset(hardreset
) && !sata_scr_valid(&ap
->link
))
2868 ata_do_eh(ap
, ops
->prereset
, ops
->softreset
, hardreset
, ops
->postreset
);
2873 * ata_eh_handle_port_suspend - perform port suspend operation
2874 * @ap: port to suspend
2879 * Kernel thread context (may sleep).
2881 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
2883 unsigned long flags
;
2886 /* are we suspending? */
2887 spin_lock_irqsave(ap
->lock
, flags
);
2888 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
2889 ap
->pm_mesg
.event
== PM_EVENT_ON
) {
2890 spin_unlock_irqrestore(ap
->lock
, flags
);
2893 spin_unlock_irqrestore(ap
->lock
, flags
);
2895 WARN_ON(ap
->pflags
& ATA_PFLAG_SUSPENDED
);
2897 /* tell ACPI we're suspending */
2898 rc
= ata_acpi_on_suspend(ap
);
2903 ata_eh_freeze_port(ap
);
2905 if (ap
->ops
->port_suspend
)
2906 rc
= ap
->ops
->port_suspend(ap
, ap
->pm_mesg
);
2908 ata_acpi_set_state(ap
, PMSG_SUSPEND
);
2911 spin_lock_irqsave(ap
->lock
, flags
);
2913 ap
->pflags
&= ~ATA_PFLAG_PM_PENDING
;
2915 ap
->pflags
|= ATA_PFLAG_SUSPENDED
;
2916 else if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2917 ata_port_schedule_eh(ap
);
2919 if (ap
->pm_result
) {
2920 *ap
->pm_result
= rc
;
2921 ap
->pm_result
= NULL
;
2924 spin_unlock_irqrestore(ap
->lock
, flags
);
2930 * ata_eh_handle_port_resume - perform port resume operation
2931 * @ap: port to resume
2936 * Kernel thread context (may sleep).
2938 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
2940 unsigned long flags
;
2943 /* are we resuming? */
2944 spin_lock_irqsave(ap
->lock
, flags
);
2945 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
2946 ap
->pm_mesg
.event
!= PM_EVENT_ON
) {
2947 spin_unlock_irqrestore(ap
->lock
, flags
);
2950 spin_unlock_irqrestore(ap
->lock
, flags
);
2952 WARN_ON(!(ap
->pflags
& ATA_PFLAG_SUSPENDED
));
2954 ata_acpi_set_state(ap
, PMSG_ON
);
2956 if (ap
->ops
->port_resume
)
2957 rc
= ap
->ops
->port_resume(ap
);
2959 /* tell ACPI that we're resuming */
2960 ata_acpi_on_resume(ap
);
2963 spin_lock_irqsave(ap
->lock
, flags
);
2964 ap
->pflags
&= ~(ATA_PFLAG_PM_PENDING
| ATA_PFLAG_SUSPENDED
);
2965 if (ap
->pm_result
) {
2966 *ap
->pm_result
= rc
;
2967 ap
->pm_result
= NULL
;
2969 spin_unlock_irqrestore(ap
->lock
, flags
);
2971 #endif /* CONFIG_PM */