2 * libata-eh.c - libata error handling
4 * Maintained by: Tejun Heo <tj@kernel.org>
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/blkdev.h>
37 #include <linux/export.h>
38 #include <linux/pci.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi_eh.h>
42 #include <scsi/scsi_device.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_dbg.h>
45 #include "../scsi/scsi_transport_api.h"
47 #include <linux/libata.h>
49 #include <trace/events/libata.h>
53 /* speed down verdicts */
54 ATA_EH_SPDN_NCQ_OFF
= (1 << 0),
55 ATA_EH_SPDN_SPEED_DOWN
= (1 << 1),
56 ATA_EH_SPDN_FALLBACK_TO_PIO
= (1 << 2),
57 ATA_EH_SPDN_KEEP_ERRORS
= (1 << 3),
60 ATA_EFLAG_IS_IO
= (1 << 0),
61 ATA_EFLAG_DUBIOUS_XFER
= (1 << 1),
62 ATA_EFLAG_OLD_ER
= (1 << 31),
64 /* error categories */
67 ATA_ECAT_TOUT_HSM
= 2,
69 ATA_ECAT_DUBIOUS_NONE
= 4,
70 ATA_ECAT_DUBIOUS_ATA_BUS
= 5,
71 ATA_ECAT_DUBIOUS_TOUT_HSM
= 6,
72 ATA_ECAT_DUBIOUS_UNK_DEV
= 7,
75 ATA_EH_CMD_DFL_TIMEOUT
= 5000,
77 /* always put at least this amount of time between resets */
78 ATA_EH_RESET_COOL_DOWN
= 5000,
80 /* Waiting in ->prereset can never be reliable. It's
81 * sometimes nice to wait there but it can't be depended upon;
82 * otherwise, we wouldn't be resetting. Just give it enough
83 * time for most drives to spin up.
85 ATA_EH_PRERESET_TIMEOUT
= 10000,
86 ATA_EH_FASTDRAIN_INTERVAL
= 3000,
90 /* probe speed down parameters, see ata_eh_schedule_probe() */
91 ATA_EH_PROBE_TRIAL_INTERVAL
= 60000, /* 1 min */
92 ATA_EH_PROBE_TRIALS
= 2,
95 /* The following table determines how we sequence resets. Each entry
96 * represents timeout for that try. The first try can be soft or
97 * hardreset. All others are hardreset if available. In most cases
98 * the first reset w/ 10sec timeout should succeed. Following entries
99 * are mostly for error handling, hotplug and those outlier devices that
100 * take an exceptionally long time to recover from reset.
102 static const unsigned long ata_eh_reset_timeouts
[] = {
103 10000, /* most drives spin up by 10sec */
104 10000, /* > 99% working drives spin up before 20sec */
105 35000, /* give > 30 secs of idleness for outlier devices */
106 5000, /* and sweet one last chance */
107 ULONG_MAX
, /* > 1 min has elapsed, give up */
110 static const unsigned long ata_eh_identify_timeouts
[] = {
111 5000, /* covers > 99% of successes and not too boring on failures */
112 10000, /* combined time till here is enough even for media access */
113 30000, /* for true idiots */
117 static const unsigned long ata_eh_flush_timeouts
[] = {
118 15000, /* be generous with flush */
120 30000, /* and even more generous */
124 static const unsigned long ata_eh_other_timeouts
[] = {
125 5000, /* same rationale as identify timeout */
127 /* but no merciful 30sec for other commands, it just isn't worth it */
131 struct ata_eh_cmd_timeout_ent
{
133 const unsigned long *timeouts
;
136 /* The following table determines timeouts to use for EH internal
137 * commands. Each table entry is a command class and matches the
138 * commands the entry applies to and the timeout table to use.
140 * On the retry after a command timed out, the next timeout value from
141 * the table is used. If the table doesn't contain further entries,
142 * the last value is used.
144 * ehc->cmd_timeout_idx keeps track of which timeout to use per
145 * command class, so if SET_FEATURES times out on the first try, the
146 * next try will use the second timeout value only for that class.
148 #define CMDS(cmds...) (const u8 []){ cmds, 0 }
149 static const struct ata_eh_cmd_timeout_ent
150 ata_eh_cmd_timeout_table
[ATA_EH_CMD_TIMEOUT_TABLE_SIZE
] = {
151 { .commands
= CMDS(ATA_CMD_ID_ATA
, ATA_CMD_ID_ATAPI
),
152 .timeouts
= ata_eh_identify_timeouts
, },
153 { .commands
= CMDS(ATA_CMD_READ_NATIVE_MAX
, ATA_CMD_READ_NATIVE_MAX_EXT
),
154 .timeouts
= ata_eh_other_timeouts
, },
155 { .commands
= CMDS(ATA_CMD_SET_MAX
, ATA_CMD_SET_MAX_EXT
),
156 .timeouts
= ata_eh_other_timeouts
, },
157 { .commands
= CMDS(ATA_CMD_SET_FEATURES
),
158 .timeouts
= ata_eh_other_timeouts
, },
159 { .commands
= CMDS(ATA_CMD_INIT_DEV_PARAMS
),
160 .timeouts
= ata_eh_other_timeouts
, },
161 { .commands
= CMDS(ATA_CMD_FLUSH
, ATA_CMD_FLUSH_EXT
),
162 .timeouts
= ata_eh_flush_timeouts
},
166 static void __ata_port_freeze(struct ata_port
*ap
);
168 static void ata_eh_handle_port_suspend(struct ata_port
*ap
);
169 static void ata_eh_handle_port_resume(struct ata_port
*ap
);
170 #else /* CONFIG_PM */
171 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
174 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
176 #endif /* CONFIG_PM */
178 static void __ata_ehi_pushv_desc(struct ata_eh_info
*ehi
, const char *fmt
,
181 ehi
->desc_len
+= vscnprintf(ehi
->desc
+ ehi
->desc_len
,
182 ATA_EH_DESC_LEN
- ehi
->desc_len
,
187 * __ata_ehi_push_desc - push error description without adding separator
189 * @fmt: printf format string
191 * Format string according to @fmt and append it to @ehi->desc.
194 * spin_lock_irqsave(host lock)
196 void __ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
201 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
206 * ata_ehi_push_desc - push error description with separator
208 * @fmt: printf format string
210 * Format string according to @fmt and append it to @ehi->desc.
211 * If @ehi->desc is not empty, ", " is added in-between.
214 * spin_lock_irqsave(host lock)
216 void ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
221 __ata_ehi_push_desc(ehi
, ", ");
224 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
229 * ata_ehi_clear_desc - clean error description
235 * spin_lock_irqsave(host lock)
237 void ata_ehi_clear_desc(struct ata_eh_info
*ehi
)
244 * ata_port_desc - append port description
245 * @ap: target ATA port
246 * @fmt: printf format string
248 * Format string according to @fmt and append it to port
249 * description. If port description is not empty, " " is added
250 * in-between. This function is to be used while initializing
251 * ata_host. The description is printed on host registration.
256 void ata_port_desc(struct ata_port
*ap
, const char *fmt
, ...)
260 WARN_ON(!(ap
->pflags
& ATA_PFLAG_INITIALIZING
));
262 if (ap
->link
.eh_info
.desc_len
)
263 __ata_ehi_push_desc(&ap
->link
.eh_info
, " ");
266 __ata_ehi_pushv_desc(&ap
->link
.eh_info
, fmt
, args
);
273 * ata_port_pbar_desc - append PCI BAR description
274 * @ap: target ATA port
275 * @bar: target PCI BAR
276 * @offset: offset into PCI BAR
277 * @name: name of the area
279 * If @offset is negative, this function formats a string which
280 * contains the name, address, size and type of the BAR and
281 * appends it to the port description. If @offset is zero or
282 * positive, only name and offsetted address is appended.
287 void ata_port_pbar_desc(struct ata_port
*ap
, int bar
, ssize_t offset
,
290 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
292 unsigned long long start
, len
;
294 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
296 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
299 start
= (unsigned long long)pci_resource_start(pdev
, bar
);
300 len
= (unsigned long long)pci_resource_len(pdev
, bar
);
303 ata_port_desc(ap
, "%s %s%llu@0x%llx", name
, type
, len
, start
);
305 ata_port_desc(ap
, "%s 0x%llx", name
,
306 start
+ (unsigned long long)offset
);
309 #endif /* CONFIG_PCI */
311 static int ata_lookup_timeout_table(u8 cmd
)
315 for (i
= 0; i
< ATA_EH_CMD_TIMEOUT_TABLE_SIZE
; i
++) {
318 for (cur
= ata_eh_cmd_timeout_table
[i
].commands
; *cur
; cur
++)
327 * ata_internal_cmd_timeout - determine timeout for an internal command
328 * @dev: target device
329 * @cmd: internal command to be issued
331 * Determine timeout for internal command @cmd for @dev.
337 * Determined timeout.
339 unsigned long ata_internal_cmd_timeout(struct ata_device
*dev
, u8 cmd
)
341 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
342 int ent
= ata_lookup_timeout_table(cmd
);
346 return ATA_EH_CMD_DFL_TIMEOUT
;
348 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
349 return ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
];
353 * ata_internal_cmd_timed_out - notification for internal command timeout
354 * @dev: target device
355 * @cmd: internal command which timed out
357 * Notify EH that internal command @cmd for @dev timed out. This
358 * function should be called only for commands whose timeouts are
359 * determined using ata_internal_cmd_timeout().
364 void ata_internal_cmd_timed_out(struct ata_device
*dev
, u8 cmd
)
366 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
367 int ent
= ata_lookup_timeout_table(cmd
);
373 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
374 if (ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
+ 1] != ULONG_MAX
)
375 ehc
->cmd_timeout_idx
[dev
->devno
][ent
]++;
378 static void ata_ering_record(struct ata_ering
*ering
, unsigned int eflags
,
379 unsigned int err_mask
)
381 struct ata_ering_entry
*ent
;
386 ering
->cursor
%= ATA_ERING_SIZE
;
388 ent
= &ering
->ring
[ering
->cursor
];
389 ent
->eflags
= eflags
;
390 ent
->err_mask
= err_mask
;
391 ent
->timestamp
= get_jiffies_64();
394 static struct ata_ering_entry
*ata_ering_top(struct ata_ering
*ering
)
396 struct ata_ering_entry
*ent
= &ering
->ring
[ering
->cursor
];
403 int ata_ering_map(struct ata_ering
*ering
,
404 int (*map_fn
)(struct ata_ering_entry
*, void *),
408 struct ata_ering_entry
*ent
;
412 ent
= &ering
->ring
[idx
];
415 rc
= map_fn(ent
, arg
);
418 idx
= (idx
- 1 + ATA_ERING_SIZE
) % ATA_ERING_SIZE
;
419 } while (idx
!= ering
->cursor
);
424 static int ata_ering_clear_cb(struct ata_ering_entry
*ent
, void *void_arg
)
426 ent
->eflags
|= ATA_EFLAG_OLD_ER
;
430 static void ata_ering_clear(struct ata_ering
*ering
)
432 ata_ering_map(ering
, ata_ering_clear_cb
, NULL
);
435 static unsigned int ata_eh_dev_action(struct ata_device
*dev
)
437 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
439 return ehc
->i
.action
| ehc
->i
.dev_action
[dev
->devno
];
442 static void ata_eh_clear_action(struct ata_link
*link
, struct ata_device
*dev
,
443 struct ata_eh_info
*ehi
, unsigned int action
)
445 struct ata_device
*tdev
;
448 ehi
->action
&= ~action
;
449 ata_for_each_dev(tdev
, link
, ALL
)
450 ehi
->dev_action
[tdev
->devno
] &= ~action
;
452 /* doesn't make sense for port-wide EH actions */
453 WARN_ON(!(action
& ATA_EH_PERDEV_MASK
));
455 /* break ehi->action into ehi->dev_action */
456 if (ehi
->action
& action
) {
457 ata_for_each_dev(tdev
, link
, ALL
)
458 ehi
->dev_action
[tdev
->devno
] |=
459 ehi
->action
& action
;
460 ehi
->action
&= ~action
;
463 /* turn off the specified per-dev action */
464 ehi
->dev_action
[dev
->devno
] &= ~action
;
469 * ata_eh_acquire - acquire EH ownership
470 * @ap: ATA port to acquire EH ownership for
472 * Acquire EH ownership for @ap. This is the basic exclusion
473 * mechanism for ports sharing a host. Only one port hanging off
474 * the same host can claim the ownership of EH.
479 void ata_eh_acquire(struct ata_port
*ap
)
481 mutex_lock(&ap
->host
->eh_mutex
);
482 WARN_ON_ONCE(ap
->host
->eh_owner
);
483 ap
->host
->eh_owner
= current
;
487 * ata_eh_release - release EH ownership
488 * @ap: ATA port to release EH ownership for
490 * Release EH ownership for @ap if the caller. The caller must
491 * have acquired EH ownership using ata_eh_acquire() previously.
496 void ata_eh_release(struct ata_port
*ap
)
498 WARN_ON_ONCE(ap
->host
->eh_owner
!= current
);
499 ap
->host
->eh_owner
= NULL
;
500 mutex_unlock(&ap
->host
->eh_mutex
);
504 * ata_scsi_timed_out - SCSI layer time out callback
505 * @cmd: timed out SCSI command
507 * Handles SCSI layer timeout. We race with normal completion of
508 * the qc for @cmd. If the qc is already gone, we lose and let
509 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
510 * timed out and EH should be invoked. Prevent ata_qc_complete()
511 * from finishing it by setting EH_SCHEDULED and return
514 * TODO: kill this function once old EH is gone.
517 * Called from timer context
520 * EH_HANDLED or EH_NOT_HANDLED
522 enum blk_eh_timer_return
ata_scsi_timed_out(struct scsi_cmnd
*cmd
)
524 struct Scsi_Host
*host
= cmd
->device
->host
;
525 struct ata_port
*ap
= ata_shost_to_port(host
);
527 struct ata_queued_cmd
*qc
;
528 enum blk_eh_timer_return ret
;
532 if (ap
->ops
->error_handler
) {
533 ret
= BLK_EH_NOT_HANDLED
;
537 ret
= BLK_EH_HANDLED
;
538 spin_lock_irqsave(ap
->lock
, flags
);
539 qc
= ata_qc_from_tag(ap
, ap
->link
.active_tag
);
541 WARN_ON(qc
->scsicmd
!= cmd
);
542 qc
->flags
|= ATA_QCFLAG_EH_SCHEDULED
;
543 qc
->err_mask
|= AC_ERR_TIMEOUT
;
544 ret
= BLK_EH_NOT_HANDLED
;
546 spin_unlock_irqrestore(ap
->lock
, flags
);
549 DPRINTK("EXIT, ret=%d\n", ret
);
552 EXPORT_SYMBOL(ata_scsi_timed_out
);
554 static void ata_eh_unload(struct ata_port
*ap
)
556 struct ata_link
*link
;
557 struct ata_device
*dev
;
560 /* Restore SControl IPM and SPD for the next driver and
561 * disable attached devices.
563 ata_for_each_link(link
, ap
, PMP_FIRST
) {
564 sata_scr_write(link
, SCR_CONTROL
, link
->saved_scontrol
& 0xff0);
565 ata_for_each_dev(dev
, link
, ALL
)
566 ata_dev_disable(dev
);
569 /* freeze and set UNLOADED */
570 spin_lock_irqsave(ap
->lock
, flags
);
572 ata_port_freeze(ap
); /* won't be thawed */
573 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
; /* clear pending from freeze */
574 ap
->pflags
|= ATA_PFLAG_UNLOADED
;
576 spin_unlock_irqrestore(ap
->lock
, flags
);
580 * ata_scsi_error - SCSI layer error handler callback
581 * @host: SCSI host on which error occurred
583 * Handles SCSI-layer-thrown error events.
586 * Inherited from SCSI layer (none, can sleep)
591 void ata_scsi_error(struct Scsi_Host
*host
)
593 struct ata_port
*ap
= ata_shost_to_port(host
);
595 LIST_HEAD(eh_work_q
);
599 spin_lock_irqsave(host
->host_lock
, flags
);
600 list_splice_init(&host
->eh_cmd_q
, &eh_work_q
);
601 spin_unlock_irqrestore(host
->host_lock
, flags
);
603 ata_scsi_cmd_error_handler(host
, ap
, &eh_work_q
);
605 /* If we timed raced normal completion and there is nothing to
606 recover nr_timedout == 0 why exactly are we doing error recovery ? */
607 ata_scsi_port_error_handler(host
, ap
);
609 /* finish or retry handled scmd's and clean up */
610 WARN_ON(!list_empty(&eh_work_q
));
616 * ata_scsi_cmd_error_handler - error callback for a list of commands
617 * @host: scsi host containing the port
618 * @ap: ATA port within the host
619 * @eh_work_q: list of commands to process
621 * process the given list of commands and return those finished to the
622 * ap->eh_done_q. This function is the first part of the libata error
623 * handler which processes a given list of failed commands.
625 void ata_scsi_cmd_error_handler(struct Scsi_Host
*host
, struct ata_port
*ap
,
626 struct list_head
*eh_work_q
)
631 /* make sure sff pio task is not running */
632 ata_sff_flush_pio_task(ap
);
634 /* synchronize with host lock and sort out timeouts */
636 /* For new EH, all qcs are finished in one of three ways -
637 * normal completion, error completion, and SCSI timeout.
638 * Both completions can race against SCSI timeout. When normal
639 * completion wins, the qc never reaches EH. When error
640 * completion wins, the qc has ATA_QCFLAG_FAILED set.
642 * When SCSI timeout wins, things are a bit more complex.
643 * Normal or error completion can occur after the timeout but
644 * before this point. In such cases, both types of
645 * completions are honored. A scmd is determined to have
646 * timed out iff its associated qc is active and not failed.
648 if (ap
->ops
->error_handler
) {
649 struct scsi_cmnd
*scmd
, *tmp
;
652 spin_lock_irqsave(ap
->lock
, flags
);
654 /* This must occur under the ap->lock as we don't want
655 a polled recovery to race the real interrupt handler
657 The lost_interrupt handler checks for any completed but
658 non-notified command and completes much like an IRQ handler.
660 We then fall into the error recovery code which will treat
661 this as if normal completion won the race */
663 if (ap
->ops
->lost_interrupt
)
664 ap
->ops
->lost_interrupt(ap
);
666 list_for_each_entry_safe(scmd
, tmp
, eh_work_q
, eh_entry
) {
667 struct ata_queued_cmd
*qc
;
669 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
670 qc
= __ata_qc_from_tag(ap
, i
);
671 if (qc
->flags
& ATA_QCFLAG_ACTIVE
&&
676 if (i
< ATA_MAX_QUEUE
) {
677 /* the scmd has an associated qc */
678 if (!(qc
->flags
& ATA_QCFLAG_FAILED
)) {
679 /* which hasn't failed yet, timeout */
680 qc
->err_mask
|= AC_ERR_TIMEOUT
;
681 qc
->flags
|= ATA_QCFLAG_FAILED
;
685 /* Normal completion occurred after
686 * SCSI timeout but before this point.
687 * Successfully complete it.
689 scmd
->retries
= scmd
->allowed
;
690 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
694 /* If we have timed out qcs. They belong to EH from
695 * this point but the state of the controller is
696 * unknown. Freeze the port to make sure the IRQ
697 * handler doesn't diddle with those qcs. This must
698 * be done atomically w.r.t. setting QCFLAG_FAILED.
701 __ata_port_freeze(ap
);
703 spin_unlock_irqrestore(ap
->lock
, flags
);
705 /* initialize eh_tries */
706 ap
->eh_tries
= ATA_EH_MAX_TRIES
;
708 spin_unlock_wait(ap
->lock
);
711 EXPORT_SYMBOL(ata_scsi_cmd_error_handler
);
714 * ata_scsi_port_error_handler - recover the port after the commands
715 * @host: SCSI host containing the port
718 * Handle the recovery of the port @ap after all the commands
719 * have been recovered.
721 void ata_scsi_port_error_handler(struct Scsi_Host
*host
, struct ata_port
*ap
)
725 /* invoke error handler */
726 if (ap
->ops
->error_handler
) {
727 struct ata_link
*link
;
729 /* acquire EH ownership */
732 /* kill fast drain timer */
733 del_timer_sync(&ap
->fastdrain_timer
);
735 /* process port resume request */
736 ata_eh_handle_port_resume(ap
);
738 /* fetch & clear EH info */
739 spin_lock_irqsave(ap
->lock
, flags
);
741 ata_for_each_link(link
, ap
, HOST_FIRST
) {
742 struct ata_eh_context
*ehc
= &link
->eh_context
;
743 struct ata_device
*dev
;
745 memset(&link
->eh_context
, 0, sizeof(link
->eh_context
));
746 link
->eh_context
.i
= link
->eh_info
;
747 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
749 ata_for_each_dev(dev
, link
, ENABLED
) {
750 int devno
= dev
->devno
;
752 ehc
->saved_xfer_mode
[devno
] = dev
->xfer_mode
;
753 if (ata_ncq_enabled(dev
))
754 ehc
->saved_ncq_enabled
|= 1 << devno
;
758 ap
->pflags
|= ATA_PFLAG_EH_IN_PROGRESS
;
759 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
760 ap
->excl_link
= NULL
; /* don't maintain exclusion over EH */
762 spin_unlock_irqrestore(ap
->lock
, flags
);
764 /* invoke EH, skip if unloading or suspended */
765 if (!(ap
->pflags
& (ATA_PFLAG_UNLOADING
| ATA_PFLAG_SUSPENDED
)))
766 ap
->ops
->error_handler(ap
);
768 /* if unloading, commence suicide */
769 if ((ap
->pflags
& ATA_PFLAG_UNLOADING
) &&
770 !(ap
->pflags
& ATA_PFLAG_UNLOADED
))
775 /* process port suspend request */
776 ata_eh_handle_port_suspend(ap
);
778 /* Exception might have happened after ->error_handler
779 * recovered the port but before this point. Repeat
782 spin_lock_irqsave(ap
->lock
, flags
);
784 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
) {
785 if (--ap
->eh_tries
) {
786 spin_unlock_irqrestore(ap
->lock
, flags
);
790 "EH pending after %d tries, giving up\n",
792 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
795 /* this run is complete, make sure EH info is clear */
796 ata_for_each_link(link
, ap
, HOST_FIRST
)
797 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
799 /* end eh (clear host_eh_scheduled) while holding
800 * ap->lock such that if exception occurs after this
801 * point but before EH completion, SCSI midlayer will
806 spin_unlock_irqrestore(ap
->lock
, flags
);
809 WARN_ON(ata_qc_from_tag(ap
, ap
->link
.active_tag
) == NULL
);
810 ap
->ops
->eng_timeout(ap
);
813 scsi_eh_flush_done_q(&ap
->eh_done_q
);
816 spin_lock_irqsave(ap
->lock
, flags
);
818 if (ap
->pflags
& ATA_PFLAG_LOADING
)
819 ap
->pflags
&= ~ATA_PFLAG_LOADING
;
820 else if (ap
->pflags
& ATA_PFLAG_SCSI_HOTPLUG
)
821 schedule_delayed_work(&ap
->hotplug_task
, 0);
823 if (ap
->pflags
& ATA_PFLAG_RECOVERED
)
824 ata_port_info(ap
, "EH complete\n");
826 ap
->pflags
&= ~(ATA_PFLAG_SCSI_HOTPLUG
| ATA_PFLAG_RECOVERED
);
828 /* tell wait_eh that we're done */
829 ap
->pflags
&= ~ATA_PFLAG_EH_IN_PROGRESS
;
830 wake_up_all(&ap
->eh_wait_q
);
832 spin_unlock_irqrestore(ap
->lock
, flags
);
834 EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler
);
837 * ata_port_wait_eh - Wait for the currently pending EH to complete
838 * @ap: Port to wait EH for
840 * Wait until the currently pending EH is complete.
843 * Kernel thread context (may sleep).
845 void ata_port_wait_eh(struct ata_port
*ap
)
851 spin_lock_irqsave(ap
->lock
, flags
);
853 while (ap
->pflags
& (ATA_PFLAG_EH_PENDING
| ATA_PFLAG_EH_IN_PROGRESS
)) {
854 prepare_to_wait(&ap
->eh_wait_q
, &wait
, TASK_UNINTERRUPTIBLE
);
855 spin_unlock_irqrestore(ap
->lock
, flags
);
857 spin_lock_irqsave(ap
->lock
, flags
);
859 finish_wait(&ap
->eh_wait_q
, &wait
);
861 spin_unlock_irqrestore(ap
->lock
, flags
);
863 /* make sure SCSI EH is complete */
864 if (scsi_host_in_recovery(ap
->scsi_host
)) {
869 EXPORT_SYMBOL_GPL(ata_port_wait_eh
);
871 static int ata_eh_nr_in_flight(struct ata_port
*ap
)
876 /* count only non-internal commands */
877 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++)
878 if (ata_qc_from_tag(ap
, tag
))
884 void ata_eh_fastdrain_timerfn(unsigned long arg
)
886 struct ata_port
*ap
= (void *)arg
;
890 spin_lock_irqsave(ap
->lock
, flags
);
892 cnt
= ata_eh_nr_in_flight(ap
);
898 if (cnt
== ap
->fastdrain_cnt
) {
901 /* No progress during the last interval, tag all
902 * in-flight qcs as timed out and freeze the port.
904 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++) {
905 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
907 qc
->err_mask
|= AC_ERR_TIMEOUT
;
912 /* some qcs have finished, give it another chance */
913 ap
->fastdrain_cnt
= cnt
;
914 ap
->fastdrain_timer
.expires
=
915 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
916 add_timer(&ap
->fastdrain_timer
);
920 spin_unlock_irqrestore(ap
->lock
, flags
);
924 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
925 * @ap: target ATA port
926 * @fastdrain: activate fast drain
928 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
929 * is non-zero and EH wasn't pending before. Fast drain ensures
930 * that EH kicks in in timely manner.
933 * spin_lock_irqsave(host lock)
935 static void ata_eh_set_pending(struct ata_port
*ap
, int fastdrain
)
939 /* already scheduled? */
940 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
)
943 ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
948 /* do we have in-flight qcs? */
949 cnt
= ata_eh_nr_in_flight(ap
);
953 /* activate fast drain */
954 ap
->fastdrain_cnt
= cnt
;
955 ap
->fastdrain_timer
.expires
=
956 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
957 add_timer(&ap
->fastdrain_timer
);
961 * ata_qc_schedule_eh - schedule qc for error handling
962 * @qc: command to schedule error handling for
964 * Schedule error handling for @qc. EH will kick in as soon as
965 * other commands are drained.
968 * spin_lock_irqsave(host lock)
970 void ata_qc_schedule_eh(struct ata_queued_cmd
*qc
)
972 struct ata_port
*ap
= qc
->ap
;
973 struct request_queue
*q
= qc
->scsicmd
->device
->request_queue
;
976 WARN_ON(!ap
->ops
->error_handler
);
978 qc
->flags
|= ATA_QCFLAG_FAILED
;
979 ata_eh_set_pending(ap
, 1);
981 /* The following will fail if timeout has already expired.
982 * ata_scsi_error() takes care of such scmds on EH entry.
983 * Note that ATA_QCFLAG_FAILED is unconditionally set after
984 * this function completes.
986 spin_lock_irqsave(q
->queue_lock
, flags
);
987 blk_abort_request(qc
->scsicmd
->request
);
988 spin_unlock_irqrestore(q
->queue_lock
, flags
);
992 * ata_std_sched_eh - non-libsas ata_ports issue eh with this common routine
993 * @ap: ATA port to schedule EH for
995 * LOCKING: inherited from ata_port_schedule_eh
996 * spin_lock_irqsave(host lock)
998 void ata_std_sched_eh(struct ata_port
*ap
)
1000 WARN_ON(!ap
->ops
->error_handler
);
1002 if (ap
->pflags
& ATA_PFLAG_INITIALIZING
)
1005 ata_eh_set_pending(ap
, 1);
1006 scsi_schedule_eh(ap
->scsi_host
);
1008 DPRINTK("port EH scheduled\n");
1010 EXPORT_SYMBOL_GPL(ata_std_sched_eh
);
1013 * ata_std_end_eh - non-libsas ata_ports complete eh with this common routine
1014 * @ap: ATA port to end EH for
1016 * In the libata object model there is a 1:1 mapping of ata_port to
1017 * shost, so host fields can be directly manipulated under ap->lock, in
1018 * the libsas case we need to hold a lock at the ha->level to coordinate
1022 * spin_lock_irqsave(host lock)
1024 void ata_std_end_eh(struct ata_port
*ap
)
1026 struct Scsi_Host
*host
= ap
->scsi_host
;
1028 host
->host_eh_scheduled
= 0;
1030 EXPORT_SYMBOL(ata_std_end_eh
);
1034 * ata_port_schedule_eh - schedule error handling without a qc
1035 * @ap: ATA port to schedule EH for
1037 * Schedule error handling for @ap. EH will kick in as soon as
1038 * all commands are drained.
1041 * spin_lock_irqsave(host lock)
1043 void ata_port_schedule_eh(struct ata_port
*ap
)
1045 /* see: ata_std_sched_eh, unless you know better */
1046 ap
->ops
->sched_eh(ap
);
1049 static int ata_do_link_abort(struct ata_port
*ap
, struct ata_link
*link
)
1051 int tag
, nr_aborted
= 0;
1053 WARN_ON(!ap
->ops
->error_handler
);
1055 /* we're gonna abort all commands, no need for fast drain */
1056 ata_eh_set_pending(ap
, 0);
1058 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1059 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
1061 if (qc
&& (!link
|| qc
->dev
->link
== link
)) {
1062 qc
->flags
|= ATA_QCFLAG_FAILED
;
1063 ata_qc_complete(qc
);
1069 ata_port_schedule_eh(ap
);
1075 * ata_link_abort - abort all qc's on the link
1076 * @link: ATA link to abort qc's for
1078 * Abort all active qc's active on @link and schedule EH.
1081 * spin_lock_irqsave(host lock)
1084 * Number of aborted qc's.
1086 int ata_link_abort(struct ata_link
*link
)
1088 return ata_do_link_abort(link
->ap
, link
);
1092 * ata_port_abort - abort all qc's on the port
1093 * @ap: ATA port to abort qc's for
1095 * Abort all active qc's of @ap and schedule EH.
1098 * spin_lock_irqsave(host_set lock)
1101 * Number of aborted qc's.
1103 int ata_port_abort(struct ata_port
*ap
)
1105 return ata_do_link_abort(ap
, NULL
);
1109 * __ata_port_freeze - freeze port
1110 * @ap: ATA port to freeze
1112 * This function is called when HSM violation or some other
1113 * condition disrupts normal operation of the port. Frozen port
1114 * is not allowed to perform any operation until the port is
1115 * thawed, which usually follows a successful reset.
1117 * ap->ops->freeze() callback can be used for freezing the port
1118 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1119 * port cannot be frozen hardware-wise, the interrupt handler
1120 * must ack and clear interrupts unconditionally while the port
1124 * spin_lock_irqsave(host lock)
1126 static void __ata_port_freeze(struct ata_port
*ap
)
1128 WARN_ON(!ap
->ops
->error_handler
);
1130 if (ap
->ops
->freeze
)
1131 ap
->ops
->freeze(ap
);
1133 ap
->pflags
|= ATA_PFLAG_FROZEN
;
1135 DPRINTK("ata%u port frozen\n", ap
->print_id
);
1139 * ata_port_freeze - abort & freeze port
1140 * @ap: ATA port to freeze
1142 * Abort and freeze @ap. The freeze operation must be called
1143 * first, because some hardware requires special operations
1144 * before the taskfile registers are accessible.
1147 * spin_lock_irqsave(host lock)
1150 * Number of aborted commands.
1152 int ata_port_freeze(struct ata_port
*ap
)
1156 WARN_ON(!ap
->ops
->error_handler
);
1158 __ata_port_freeze(ap
);
1159 nr_aborted
= ata_port_abort(ap
);
1165 * sata_async_notification - SATA async notification handler
1166 * @ap: ATA port where async notification is received
1168 * Handler to be called when async notification via SDB FIS is
1169 * received. This function schedules EH if necessary.
1172 * spin_lock_irqsave(host lock)
1175 * 1 if EH is scheduled, 0 otherwise.
1177 int sata_async_notification(struct ata_port
*ap
)
1182 if (!(ap
->flags
& ATA_FLAG_AN
))
1185 rc
= sata_scr_read(&ap
->link
, SCR_NOTIFICATION
, &sntf
);
1187 sata_scr_write(&ap
->link
, SCR_NOTIFICATION
, sntf
);
1189 if (!sata_pmp_attached(ap
) || rc
) {
1190 /* PMP is not attached or SNTF is not available */
1191 if (!sata_pmp_attached(ap
)) {
1192 /* PMP is not attached. Check whether ATAPI
1193 * AN is configured. If so, notify media
1196 struct ata_device
*dev
= ap
->link
.device
;
1198 if ((dev
->class == ATA_DEV_ATAPI
) &&
1199 (dev
->flags
& ATA_DFLAG_AN
))
1200 ata_scsi_media_change_notify(dev
);
1203 /* PMP is attached but SNTF is not available.
1204 * ATAPI async media change notification is
1205 * not used. The PMP must be reporting PHY
1206 * status change, schedule EH.
1208 ata_port_schedule_eh(ap
);
1212 /* PMP is attached and SNTF is available */
1213 struct ata_link
*link
;
1215 /* check and notify ATAPI AN */
1216 ata_for_each_link(link
, ap
, EDGE
) {
1217 if (!(sntf
& (1 << link
->pmp
)))
1220 if ((link
->device
->class == ATA_DEV_ATAPI
) &&
1221 (link
->device
->flags
& ATA_DFLAG_AN
))
1222 ata_scsi_media_change_notify(link
->device
);
1225 /* If PMP is reporting that PHY status of some
1226 * downstream ports has changed, schedule EH.
1228 if (sntf
& (1 << SATA_PMP_CTRL_PORT
)) {
1229 ata_port_schedule_eh(ap
);
1238 * ata_eh_freeze_port - EH helper to freeze port
1239 * @ap: ATA port to freeze
1246 void ata_eh_freeze_port(struct ata_port
*ap
)
1248 unsigned long flags
;
1250 if (!ap
->ops
->error_handler
)
1253 spin_lock_irqsave(ap
->lock
, flags
);
1254 __ata_port_freeze(ap
);
1255 spin_unlock_irqrestore(ap
->lock
, flags
);
1259 * ata_port_thaw_port - EH helper to thaw port
1260 * @ap: ATA port to thaw
1262 * Thaw frozen port @ap.
1267 void ata_eh_thaw_port(struct ata_port
*ap
)
1269 unsigned long flags
;
1271 if (!ap
->ops
->error_handler
)
1274 spin_lock_irqsave(ap
->lock
, flags
);
1276 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
1281 spin_unlock_irqrestore(ap
->lock
, flags
);
1283 DPRINTK("ata%u port thawed\n", ap
->print_id
);
1286 static void ata_eh_scsidone(struct scsi_cmnd
*scmd
)
1291 static void __ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1293 struct ata_port
*ap
= qc
->ap
;
1294 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1295 unsigned long flags
;
1297 spin_lock_irqsave(ap
->lock
, flags
);
1298 qc
->scsidone
= ata_eh_scsidone
;
1299 __ata_qc_complete(qc
);
1300 WARN_ON(ata_tag_valid(qc
->tag
));
1301 spin_unlock_irqrestore(ap
->lock
, flags
);
1303 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
1307 * ata_eh_qc_complete - Complete an active ATA command from EH
1308 * @qc: Command to complete
1310 * Indicate to the mid and upper layers that an ATA command has
1311 * completed. To be used from EH.
1313 void ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1315 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1316 scmd
->retries
= scmd
->allowed
;
1317 __ata_eh_qc_complete(qc
);
1321 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1322 * @qc: Command to retry
1324 * Indicate to the mid and upper layers that an ATA command
1325 * should be retried. To be used from EH.
1327 * SCSI midlayer limits the number of retries to scmd->allowed.
1328 * scmd->allowed is incremented for commands which get retried
1329 * due to unrelated failures (qc->err_mask is zero).
1331 void ata_eh_qc_retry(struct ata_queued_cmd
*qc
)
1333 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1336 __ata_eh_qc_complete(qc
);
1340 * ata_dev_disable - disable ATA device
1341 * @dev: ATA device to disable
1348 void ata_dev_disable(struct ata_device
*dev
)
1350 if (!ata_dev_enabled(dev
))
1353 if (ata_msg_drv(dev
->link
->ap
))
1354 ata_dev_warn(dev
, "disabled\n");
1355 ata_acpi_on_disable(dev
);
1356 ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO0
| ATA_DNXFER_QUIET
);
1359 /* From now till the next successful probe, ering is used to
1360 * track probe failures. Clear accumulated device error info.
1362 ata_ering_clear(&dev
->ering
);
1366 * ata_eh_detach_dev - detach ATA device
1367 * @dev: ATA device to detach
1374 void ata_eh_detach_dev(struct ata_device
*dev
)
1376 struct ata_link
*link
= dev
->link
;
1377 struct ata_port
*ap
= link
->ap
;
1378 struct ata_eh_context
*ehc
= &link
->eh_context
;
1379 unsigned long flags
;
1381 ata_dev_disable(dev
);
1383 spin_lock_irqsave(ap
->lock
, flags
);
1385 dev
->flags
&= ~ATA_DFLAG_DETACH
;
1387 if (ata_scsi_offline_dev(dev
)) {
1388 dev
->flags
|= ATA_DFLAG_DETACHED
;
1389 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
1392 /* clear per-dev EH info */
1393 ata_eh_clear_action(link
, dev
, &link
->eh_info
, ATA_EH_PERDEV_MASK
);
1394 ata_eh_clear_action(link
, dev
, &link
->eh_context
.i
, ATA_EH_PERDEV_MASK
);
1395 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
1396 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
1398 spin_unlock_irqrestore(ap
->lock
, flags
);
1402 * ata_eh_about_to_do - about to perform eh_action
1403 * @link: target ATA link
1404 * @dev: target ATA dev for per-dev action (can be NULL)
1405 * @action: action about to be performed
1407 * Called just before performing EH actions to clear related bits
1408 * in @link->eh_info such that eh actions are not unnecessarily
1414 void ata_eh_about_to_do(struct ata_link
*link
, struct ata_device
*dev
,
1415 unsigned int action
)
1417 struct ata_port
*ap
= link
->ap
;
1418 struct ata_eh_info
*ehi
= &link
->eh_info
;
1419 struct ata_eh_context
*ehc
= &link
->eh_context
;
1420 unsigned long flags
;
1422 spin_lock_irqsave(ap
->lock
, flags
);
1424 ata_eh_clear_action(link
, dev
, ehi
, action
);
1426 /* About to take EH action, set RECOVERED. Ignore actions on
1427 * slave links as master will do them again.
1429 if (!(ehc
->i
.flags
& ATA_EHI_QUIET
) && link
!= ap
->slave_link
)
1430 ap
->pflags
|= ATA_PFLAG_RECOVERED
;
1432 spin_unlock_irqrestore(ap
->lock
, flags
);
1436 * ata_eh_done - EH action complete
1437 * @ap: target ATA port
1438 * @dev: target ATA dev for per-dev action (can be NULL)
1439 * @action: action just completed
1441 * Called right after performing EH actions to clear related bits
1442 * in @link->eh_context.
1447 void ata_eh_done(struct ata_link
*link
, struct ata_device
*dev
,
1448 unsigned int action
)
1450 struct ata_eh_context
*ehc
= &link
->eh_context
;
1452 ata_eh_clear_action(link
, dev
, &ehc
->i
, action
);
1456 * ata_err_string - convert err_mask to descriptive string
1457 * @err_mask: error mask to convert to string
1459 * Convert @err_mask to descriptive string. Errors are
1460 * prioritized according to severity and only the most severe
1461 * error is reported.
1467 * Descriptive string for @err_mask
1469 static const char *ata_err_string(unsigned int err_mask
)
1471 if (err_mask
& AC_ERR_HOST_BUS
)
1472 return "host bus error";
1473 if (err_mask
& AC_ERR_ATA_BUS
)
1474 return "ATA bus error";
1475 if (err_mask
& AC_ERR_TIMEOUT
)
1477 if (err_mask
& AC_ERR_HSM
)
1478 return "HSM violation";
1479 if (err_mask
& AC_ERR_SYSTEM
)
1480 return "internal error";
1481 if (err_mask
& AC_ERR_MEDIA
)
1482 return "media error";
1483 if (err_mask
& AC_ERR_INVALID
)
1484 return "invalid argument";
1485 if (err_mask
& AC_ERR_DEV
)
1486 return "device error";
1487 return "unknown error";
1491 * ata_read_log_page - read a specific log page
1492 * @dev: target device
1494 * @page: page to read
1495 * @buf: buffer to store read page
1496 * @sectors: number of sectors to read
1498 * Read log page using READ_LOG_EXT command.
1501 * Kernel thread context (may sleep).
1504 * 0 on success, AC_ERR_* mask otherwise.
1506 unsigned int ata_read_log_page(struct ata_device
*dev
, u8 log
,
1507 u8 page
, void *buf
, unsigned int sectors
)
1509 unsigned long ap_flags
= dev
->link
->ap
->flags
;
1510 struct ata_taskfile tf
;
1511 unsigned int err_mask
;
1514 DPRINTK("read log page - log 0x%x, page 0x%x\n", log
, page
);
1517 * Return error without actually issuing the command on controllers
1518 * which e.g. lockup on a read log page.
1520 if (ap_flags
& ATA_FLAG_NO_LOG_PAGE
)
1524 ata_tf_init(dev
, &tf
);
1525 if (dev
->dma_mode
&& ata_id_has_read_log_dma_ext(dev
->id
) &&
1526 !(dev
->horkage
& ATA_HORKAGE_NO_NCQ_LOG
)) {
1527 tf
.command
= ATA_CMD_READ_LOG_DMA_EXT
;
1528 tf
.protocol
= ATA_PROT_DMA
;
1531 tf
.command
= ATA_CMD_READ_LOG_EXT
;
1532 tf
.protocol
= ATA_PROT_PIO
;
1538 tf
.hob_nsect
= sectors
>> 8;
1539 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA48
| ATA_TFLAG_DEVICE
;
1541 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1542 buf
, sectors
* ATA_SECT_SIZE
, 0);
1544 if (err_mask
&& dma
) {
1545 dev
->horkage
|= ATA_HORKAGE_NO_NCQ_LOG
;
1546 ata_dev_warn(dev
, "READ LOG DMA EXT failed, trying unqueued\n");
1550 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
1555 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1556 * @dev: Device to read log page 10h from
1557 * @tag: Resulting tag of the failed command
1558 * @tf: Resulting taskfile registers of the failed command
1560 * Read log page 10h to obtain NCQ error details and clear error
1564 * Kernel thread context (may sleep).
1567 * 0 on success, -errno otherwise.
1569 static int ata_eh_read_log_10h(struct ata_device
*dev
,
1570 int *tag
, struct ata_taskfile
*tf
)
1572 u8
*buf
= dev
->link
->ap
->sector_buf
;
1573 unsigned int err_mask
;
1577 err_mask
= ata_read_log_page(dev
, ATA_LOG_SATA_NCQ
, 0, buf
, 1);
1582 for (i
= 0; i
< ATA_SECT_SIZE
; i
++)
1585 ata_dev_warn(dev
, "invalid checksum 0x%x on log page 10h\n",
1591 *tag
= buf
[0] & 0x1f;
1593 tf
->command
= buf
[2];
1594 tf
->feature
= buf
[3];
1598 tf
->device
= buf
[7];
1599 tf
->hob_lbal
= buf
[8];
1600 tf
->hob_lbam
= buf
[9];
1601 tf
->hob_lbah
= buf
[10];
1602 tf
->nsect
= buf
[12];
1603 tf
->hob_nsect
= buf
[13];
1604 if (ata_id_has_ncq_autosense(dev
->id
))
1605 tf
->auxiliary
= buf
[14] << 16 | buf
[15] << 8 | buf
[16];
1611 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1612 * @dev: target ATAPI device
1613 * @r_sense_key: out parameter for sense_key
1615 * Perform ATAPI TEST_UNIT_READY.
1618 * EH context (may sleep).
1621 * 0 on success, AC_ERR_* mask on failure.
1623 unsigned int atapi_eh_tur(struct ata_device
*dev
, u8
*r_sense_key
)
1625 u8 cdb
[ATAPI_CDB_LEN
] = { TEST_UNIT_READY
, 0, 0, 0, 0, 0 };
1626 struct ata_taskfile tf
;
1627 unsigned int err_mask
;
1629 ata_tf_init(dev
, &tf
);
1631 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1632 tf
.command
= ATA_CMD_PACKET
;
1633 tf
.protocol
= ATAPI_PROT_NODATA
;
1635 err_mask
= ata_exec_internal(dev
, &tf
, cdb
, DMA_NONE
, NULL
, 0, 0);
1636 if (err_mask
== AC_ERR_DEV
)
1637 *r_sense_key
= tf
.feature
>> 4;
1642 * ata_eh_request_sense - perform REQUEST_SENSE_DATA_EXT
1643 * @dev: device to perform REQUEST_SENSE_SENSE_DATA_EXT to
1644 * @cmd: scsi command for which the sense code should be set
1646 * Perform REQUEST_SENSE_DATA_EXT after the device reported CHECK
1647 * SENSE. This function is an EH helper.
1650 * Kernel thread context (may sleep).
1652 static void ata_eh_request_sense(struct ata_queued_cmd
*qc
,
1653 struct scsi_cmnd
*cmd
)
1655 struct ata_device
*dev
= qc
->dev
;
1656 struct ata_taskfile tf
;
1657 unsigned int err_mask
;
1659 if (qc
->ap
->pflags
& ATA_PFLAG_FROZEN
) {
1660 ata_dev_warn(dev
, "sense data available but port frozen\n");
1664 if (!cmd
|| qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
1667 if (!ata_id_sense_reporting_enabled(dev
->id
)) {
1668 ata_dev_warn(qc
->dev
, "sense data reporting disabled\n");
1672 DPRINTK("ATA request sense\n");
1674 ata_tf_init(dev
, &tf
);
1675 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1676 tf
.flags
|= ATA_TFLAG_LBA
| ATA_TFLAG_LBA48
;
1677 tf
.command
= ATA_CMD_REQ_SENSE_DATA
;
1678 tf
.protocol
= ATA_PROT_NODATA
;
1680 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
1681 /* Ignore err_mask; ATA_ERR might be set */
1682 if (tf
.command
& ATA_SENSE
) {
1683 ata_scsi_set_sense(dev
, cmd
, tf
.lbah
, tf
.lbam
, tf
.lbal
);
1684 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1686 ata_dev_warn(dev
, "request sense failed stat %02x emask %x\n",
1687 tf
.command
, err_mask
);
1692 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1693 * @dev: device to perform REQUEST_SENSE to
1694 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1695 * @dfl_sense_key: default sense key to use
1697 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1698 * SENSE. This function is EH helper.
1701 * Kernel thread context (may sleep).
1704 * 0 on success, AC_ERR_* mask on failure
1706 unsigned int atapi_eh_request_sense(struct ata_device
*dev
,
1707 u8
*sense_buf
, u8 dfl_sense_key
)
1709 u8 cdb
[ATAPI_CDB_LEN
] =
1710 { REQUEST_SENSE
, 0, 0, 0, SCSI_SENSE_BUFFERSIZE
, 0 };
1711 struct ata_port
*ap
= dev
->link
->ap
;
1712 struct ata_taskfile tf
;
1714 DPRINTK("ATAPI request sense\n");
1716 memset(sense_buf
, 0, SCSI_SENSE_BUFFERSIZE
);
1718 /* initialize sense_buf with the error register,
1719 * for the case where they are -not- overwritten
1721 sense_buf
[0] = 0x70;
1722 sense_buf
[2] = dfl_sense_key
;
1724 /* some devices time out if garbage left in tf */
1725 ata_tf_init(dev
, &tf
);
1727 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1728 tf
.command
= ATA_CMD_PACKET
;
1730 /* is it pointless to prefer PIO for "safety reasons"? */
1731 if (ap
->flags
& ATA_FLAG_PIO_DMA
) {
1732 tf
.protocol
= ATAPI_PROT_DMA
;
1733 tf
.feature
|= ATAPI_PKT_DMA
;
1735 tf
.protocol
= ATAPI_PROT_PIO
;
1736 tf
.lbam
= SCSI_SENSE_BUFFERSIZE
;
1740 return ata_exec_internal(dev
, &tf
, cdb
, DMA_FROM_DEVICE
,
1741 sense_buf
, SCSI_SENSE_BUFFERSIZE
, 0);
1745 * ata_eh_analyze_serror - analyze SError for a failed port
1746 * @link: ATA link to analyze SError for
1748 * Analyze SError if available and further determine cause of
1754 static void ata_eh_analyze_serror(struct ata_link
*link
)
1756 struct ata_eh_context
*ehc
= &link
->eh_context
;
1757 u32 serror
= ehc
->i
.serror
;
1758 unsigned int err_mask
= 0, action
= 0;
1761 if (serror
& (SERR_PERSISTENT
| SERR_DATA
)) {
1762 err_mask
|= AC_ERR_ATA_BUS
;
1763 action
|= ATA_EH_RESET
;
1765 if (serror
& SERR_PROTOCOL
) {
1766 err_mask
|= AC_ERR_HSM
;
1767 action
|= ATA_EH_RESET
;
1769 if (serror
& SERR_INTERNAL
) {
1770 err_mask
|= AC_ERR_SYSTEM
;
1771 action
|= ATA_EH_RESET
;
1774 /* Determine whether a hotplug event has occurred. Both
1775 * SError.N/X are considered hotplug events for enabled or
1776 * host links. For disabled PMP links, only N bit is
1777 * considered as X bit is left at 1 for link plugging.
1779 if (link
->lpm_policy
> ATA_LPM_MAX_POWER
)
1780 hotplug_mask
= 0; /* hotplug doesn't work w/ LPM */
1781 else if (!(link
->flags
& ATA_LFLAG_DISABLED
) || ata_is_host_link(link
))
1782 hotplug_mask
= SERR_PHYRDY_CHG
| SERR_DEV_XCHG
;
1784 hotplug_mask
= SERR_PHYRDY_CHG
;
1786 if (serror
& hotplug_mask
)
1787 ata_ehi_hotplugged(&ehc
->i
);
1789 ehc
->i
.err_mask
|= err_mask
;
1790 ehc
->i
.action
|= action
;
1794 * ata_eh_analyze_ncq_error - analyze NCQ error
1795 * @link: ATA link to analyze NCQ error for
1797 * Read log page 10h, determine the offending qc and acquire
1798 * error status TF. For NCQ device errors, all LLDDs have to do
1799 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1803 * Kernel thread context (may sleep).
1805 void ata_eh_analyze_ncq_error(struct ata_link
*link
)
1807 struct ata_port
*ap
= link
->ap
;
1808 struct ata_eh_context
*ehc
= &link
->eh_context
;
1809 struct ata_device
*dev
= link
->device
;
1810 struct ata_queued_cmd
*qc
;
1811 struct ata_taskfile tf
;
1814 /* if frozen, we can't do much */
1815 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1818 /* is it NCQ device error? */
1819 if (!link
->sactive
|| !(ehc
->i
.err_mask
& AC_ERR_DEV
))
1822 /* has LLDD analyzed already? */
1823 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1824 qc
= __ata_qc_from_tag(ap
, tag
);
1826 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1833 /* okay, this error is ours */
1834 memset(&tf
, 0, sizeof(tf
));
1835 rc
= ata_eh_read_log_10h(dev
, &tag
, &tf
);
1837 ata_link_err(link
, "failed to read log page 10h (errno=%d)\n",
1842 if (!(link
->sactive
& (1 << tag
))) {
1843 ata_link_err(link
, "log page 10h reported inactive tag %d\n",
1848 /* we've got the perpetrator, condemn it */
1849 qc
= __ata_qc_from_tag(ap
, tag
);
1850 memcpy(&qc
->result_tf
, &tf
, sizeof(tf
));
1851 qc
->result_tf
.flags
= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA
| ATA_TFLAG_LBA48
;
1852 qc
->err_mask
|= AC_ERR_DEV
| AC_ERR_NCQ
;
1853 if ((qc
->result_tf
.command
& ATA_SENSE
) || qc
->result_tf
.auxiliary
) {
1854 char sense_key
, asc
, ascq
;
1856 sense_key
= (qc
->result_tf
.auxiliary
>> 16) & 0xff;
1857 asc
= (qc
->result_tf
.auxiliary
>> 8) & 0xff;
1858 ascq
= qc
->result_tf
.auxiliary
& 0xff;
1859 ata_scsi_set_sense(dev
, qc
->scsicmd
, sense_key
, asc
, ascq
);
1860 ata_scsi_set_sense_information(dev
, qc
->scsicmd
,
1862 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1865 ehc
->i
.err_mask
&= ~AC_ERR_DEV
;
1869 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1870 * @qc: qc to analyze
1871 * @tf: Taskfile registers to analyze
1873 * Analyze taskfile of @qc and further determine cause of
1874 * failure. This function also requests ATAPI sense data if
1878 * Kernel thread context (may sleep).
1881 * Determined recovery action
1883 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd
*qc
,
1884 const struct ata_taskfile
*tf
)
1886 unsigned int tmp
, action
= 0;
1887 u8 stat
= tf
->command
, err
= tf
->feature
;
1889 if ((stat
& (ATA_BUSY
| ATA_DRQ
| ATA_DRDY
)) != ATA_DRDY
) {
1890 qc
->err_mask
|= AC_ERR_HSM
;
1891 return ATA_EH_RESET
;
1894 if (stat
& (ATA_ERR
| ATA_DF
)) {
1895 qc
->err_mask
|= AC_ERR_DEV
;
1897 * Sense data reporting does not work if the
1898 * device fault bit is set.
1906 switch (qc
->dev
->class) {
1909 if (stat
& ATA_SENSE
)
1910 ata_eh_request_sense(qc
, qc
->scsicmd
);
1912 qc
->err_mask
|= AC_ERR_ATA_BUS
;
1913 if (err
& (ATA_UNC
| ATA_AMNF
))
1914 qc
->err_mask
|= AC_ERR_MEDIA
;
1916 qc
->err_mask
|= AC_ERR_INVALID
;
1920 if (!(qc
->ap
->pflags
& ATA_PFLAG_FROZEN
)) {
1921 tmp
= atapi_eh_request_sense(qc
->dev
,
1922 qc
->scsicmd
->sense_buffer
,
1923 qc
->result_tf
.feature
>> 4);
1925 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1927 qc
->err_mask
|= tmp
;
1931 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
1932 int ret
= scsi_check_sense(qc
->scsicmd
);
1934 * SUCCESS here means that the sense code could
1935 * evaluated and should be passed to the upper layers
1936 * for correct evaluation.
1937 * FAILED means the sense code could not interpreted
1938 * and the device would need to be reset.
1939 * NEEDS_RETRY and ADD_TO_MLQUEUE means that the
1940 * command would need to be retried.
1942 if (ret
== NEEDS_RETRY
|| ret
== ADD_TO_MLQUEUE
) {
1943 qc
->flags
|= ATA_QCFLAG_RETRY
;
1944 qc
->err_mask
|= AC_ERR_OTHER
;
1945 } else if (ret
!= SUCCESS
) {
1946 qc
->err_mask
|= AC_ERR_HSM
;
1949 if (qc
->err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
| AC_ERR_ATA_BUS
))
1950 action
|= ATA_EH_RESET
;
1955 static int ata_eh_categorize_error(unsigned int eflags
, unsigned int err_mask
,
1960 if (!(eflags
& ATA_EFLAG_DUBIOUS_XFER
))
1964 base
= ATA_ECAT_DUBIOUS_NONE
;
1966 if (err_mask
& AC_ERR_ATA_BUS
)
1967 return base
+ ATA_ECAT_ATA_BUS
;
1969 if (err_mask
& AC_ERR_TIMEOUT
)
1970 return base
+ ATA_ECAT_TOUT_HSM
;
1972 if (eflags
& ATA_EFLAG_IS_IO
) {
1973 if (err_mask
& AC_ERR_HSM
)
1974 return base
+ ATA_ECAT_TOUT_HSM
;
1976 (AC_ERR_DEV
|AC_ERR_MEDIA
|AC_ERR_INVALID
)) == AC_ERR_DEV
)
1977 return base
+ ATA_ECAT_UNK_DEV
;
1983 struct speed_down_verdict_arg
{
1986 int nr_errors
[ATA_ECAT_NR
];
1989 static int speed_down_verdict_cb(struct ata_ering_entry
*ent
, void *void_arg
)
1991 struct speed_down_verdict_arg
*arg
= void_arg
;
1994 if ((ent
->eflags
& ATA_EFLAG_OLD_ER
) || (ent
->timestamp
< arg
->since
))
1997 cat
= ata_eh_categorize_error(ent
->eflags
, ent
->err_mask
,
1999 arg
->nr_errors
[cat
]++;
2005 * ata_eh_speed_down_verdict - Determine speed down verdict
2006 * @dev: Device of interest
2008 * This function examines error ring of @dev and determines
2009 * whether NCQ needs to be turned off, transfer speed should be
2010 * stepped down, or falling back to PIO is necessary.
2012 * ECAT_ATA_BUS : ATA_BUS error for any command
2014 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
2017 * ECAT_UNK_DEV : Unknown DEV error for IO commands
2019 * ECAT_DUBIOUS_* : Identical to above three but occurred while
2020 * data transfer hasn't been verified.
2024 * NCQ_OFF : Turn off NCQ.
2026 * SPEED_DOWN : Speed down transfer speed but don't fall back
2029 * FALLBACK_TO_PIO : Fall back to PIO.
2031 * Even if multiple verdicts are returned, only one action is
2032 * taken per error. An action triggered by non-DUBIOUS errors
2033 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
2034 * This is to expedite speed down decisions right after device is
2035 * initially configured.
2037 * The following are speed down rules. #1 and #2 deal with
2040 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
2041 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
2043 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
2044 * occurred during last 5 mins, NCQ_OFF.
2046 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
2047 * occurred during last 5 mins, FALLBACK_TO_PIO
2049 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
2050 * during last 10 mins, NCQ_OFF.
2052 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
2053 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
2056 * Inherited from caller.
2059 * OR of ATA_EH_SPDN_* flags.
2061 static unsigned int ata_eh_speed_down_verdict(struct ata_device
*dev
)
2063 const u64 j5mins
= 5LLU * 60 * HZ
, j10mins
= 10LLU * 60 * HZ
;
2064 u64 j64
= get_jiffies_64();
2065 struct speed_down_verdict_arg arg
;
2066 unsigned int verdict
= 0;
2068 /* scan past 5 mins of error history */
2069 memset(&arg
, 0, sizeof(arg
));
2070 arg
.since
= j64
- min(j64
, j5mins
);
2071 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
2073 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_ATA_BUS
] +
2074 arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] > 1)
2075 verdict
|= ATA_EH_SPDN_SPEED_DOWN
|
2076 ATA_EH_SPDN_FALLBACK_TO_PIO
| ATA_EH_SPDN_KEEP_ERRORS
;
2078 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] +
2079 arg
.nr_errors
[ATA_ECAT_DUBIOUS_UNK_DEV
] > 1)
2080 verdict
|= ATA_EH_SPDN_NCQ_OFF
| ATA_EH_SPDN_KEEP_ERRORS
;
2082 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
2083 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
2084 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
2085 verdict
|= ATA_EH_SPDN_FALLBACK_TO_PIO
;
2087 /* scan past 10 mins of error history */
2088 memset(&arg
, 0, sizeof(arg
));
2089 arg
.since
= j64
- min(j64
, j10mins
);
2090 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
2092 if (arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
2093 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 3)
2094 verdict
|= ATA_EH_SPDN_NCQ_OFF
;
2096 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
2097 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] > 3 ||
2098 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
2099 verdict
|= ATA_EH_SPDN_SPEED_DOWN
;
2105 * ata_eh_speed_down - record error and speed down if necessary
2106 * @dev: Failed device
2107 * @eflags: mask of ATA_EFLAG_* flags
2108 * @err_mask: err_mask of the error
2110 * Record error and examine error history to determine whether
2111 * adjusting transmission speed is necessary. It also sets
2112 * transmission limits appropriately if such adjustment is
2116 * Kernel thread context (may sleep).
2119 * Determined recovery action.
2121 static unsigned int ata_eh_speed_down(struct ata_device
*dev
,
2122 unsigned int eflags
, unsigned int err_mask
)
2124 struct ata_link
*link
= ata_dev_phys_link(dev
);
2126 unsigned int verdict
;
2127 unsigned int action
= 0;
2129 /* don't bother if Cat-0 error */
2130 if (ata_eh_categorize_error(eflags
, err_mask
, &xfer_ok
) == 0)
2133 /* record error and determine whether speed down is necessary */
2134 ata_ering_record(&dev
->ering
, eflags
, err_mask
);
2135 verdict
= ata_eh_speed_down_verdict(dev
);
2138 if ((verdict
& ATA_EH_SPDN_NCQ_OFF
) &&
2139 (dev
->flags
& (ATA_DFLAG_PIO
| ATA_DFLAG_NCQ
|
2140 ATA_DFLAG_NCQ_OFF
)) == ATA_DFLAG_NCQ
) {
2141 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
2142 ata_dev_warn(dev
, "NCQ disabled due to excessive errors\n");
2147 if (verdict
& ATA_EH_SPDN_SPEED_DOWN
) {
2148 /* speed down SATA link speed if possible */
2149 if (sata_down_spd_limit(link
, 0) == 0) {
2150 action
|= ATA_EH_RESET
;
2154 /* lower transfer mode */
2155 if (dev
->spdn_cnt
< 2) {
2156 static const int dma_dnxfer_sel
[] =
2157 { ATA_DNXFER_DMA
, ATA_DNXFER_40C
};
2158 static const int pio_dnxfer_sel
[] =
2159 { ATA_DNXFER_PIO
, ATA_DNXFER_FORCE_PIO0
};
2162 if (dev
->xfer_shift
!= ATA_SHIFT_PIO
)
2163 sel
= dma_dnxfer_sel
[dev
->spdn_cnt
];
2165 sel
= pio_dnxfer_sel
[dev
->spdn_cnt
];
2169 if (ata_down_xfermask_limit(dev
, sel
) == 0) {
2170 action
|= ATA_EH_RESET
;
2176 /* Fall back to PIO? Slowing down to PIO is meaningless for
2177 * SATA ATA devices. Consider it only for PATA and SATAPI.
2179 if ((verdict
& ATA_EH_SPDN_FALLBACK_TO_PIO
) && (dev
->spdn_cnt
>= 2) &&
2180 (link
->ap
->cbl
!= ATA_CBL_SATA
|| dev
->class == ATA_DEV_ATAPI
) &&
2181 (dev
->xfer_shift
!= ATA_SHIFT_PIO
)) {
2182 if (ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO
) == 0) {
2184 action
|= ATA_EH_RESET
;
2191 /* device has been slowed down, blow error history */
2192 if (!(verdict
& ATA_EH_SPDN_KEEP_ERRORS
))
2193 ata_ering_clear(&dev
->ering
);
2198 * ata_eh_worth_retry - analyze error and decide whether to retry
2199 * @qc: qc to possibly retry
2201 * Look at the cause of the error and decide if a retry
2202 * might be useful or not. We don't want to retry media errors
2203 * because the drive itself has probably already taken 10-30 seconds
2204 * doing its own internal retries before reporting the failure.
2206 static inline int ata_eh_worth_retry(struct ata_queued_cmd
*qc
)
2208 if (qc
->err_mask
& AC_ERR_MEDIA
)
2209 return 0; /* don't retry media errors */
2210 if (qc
->flags
& ATA_QCFLAG_IO
)
2211 return 1; /* otherwise retry anything from fs stack */
2212 if (qc
->err_mask
& AC_ERR_INVALID
)
2213 return 0; /* don't retry these */
2214 return qc
->err_mask
!= AC_ERR_DEV
; /* retry if not dev error */
2218 * ata_eh_link_autopsy - analyze error and determine recovery action
2219 * @link: host link to perform autopsy on
2221 * Analyze why @link failed and determine which recovery actions
2222 * are needed. This function also sets more detailed AC_ERR_*
2223 * values and fills sense data for ATAPI CHECK SENSE.
2226 * Kernel thread context (may sleep).
2228 static void ata_eh_link_autopsy(struct ata_link
*link
)
2230 struct ata_port
*ap
= link
->ap
;
2231 struct ata_eh_context
*ehc
= &link
->eh_context
;
2232 struct ata_device
*dev
;
2233 unsigned int all_err_mask
= 0, eflags
= 0;
2240 if (ehc
->i
.flags
& ATA_EHI_NO_AUTOPSY
)
2243 /* obtain and analyze SError */
2244 rc
= sata_scr_read(link
, SCR_ERROR
, &serror
);
2246 ehc
->i
.serror
|= serror
;
2247 ata_eh_analyze_serror(link
);
2248 } else if (rc
!= -EOPNOTSUPP
) {
2249 /* SError read failed, force reset and probing */
2250 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
2251 ehc
->i
.action
|= ATA_EH_RESET
;
2252 ehc
->i
.err_mask
|= AC_ERR_OTHER
;
2255 /* analyze NCQ failure */
2256 ata_eh_analyze_ncq_error(link
);
2258 /* any real error trumps AC_ERR_OTHER */
2259 if (ehc
->i
.err_mask
& ~AC_ERR_OTHER
)
2260 ehc
->i
.err_mask
&= ~AC_ERR_OTHER
;
2262 all_err_mask
|= ehc
->i
.err_mask
;
2264 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2265 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2267 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2268 ata_dev_phys_link(qc
->dev
) != link
)
2271 /* inherit upper level err_mask */
2272 qc
->err_mask
|= ehc
->i
.err_mask
;
2275 ehc
->i
.action
|= ata_eh_analyze_tf(qc
, &qc
->result_tf
);
2277 /* DEV errors are probably spurious in case of ATA_BUS error */
2278 if (qc
->err_mask
& AC_ERR_ATA_BUS
)
2279 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_MEDIA
|
2282 /* any real error trumps unknown error */
2283 if (qc
->err_mask
& ~AC_ERR_OTHER
)
2284 qc
->err_mask
&= ~AC_ERR_OTHER
;
2286 /* SENSE_VALID trumps dev/unknown error and revalidation */
2287 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
2288 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_OTHER
);
2290 /* determine whether the command is worth retrying */
2291 if (ata_eh_worth_retry(qc
))
2292 qc
->flags
|= ATA_QCFLAG_RETRY
;
2294 /* accumulate error info */
2295 ehc
->i
.dev
= qc
->dev
;
2296 all_err_mask
|= qc
->err_mask
;
2297 if (qc
->flags
& ATA_QCFLAG_IO
)
2298 eflags
|= ATA_EFLAG_IS_IO
;
2299 trace_ata_eh_link_autopsy_qc(qc
);
2302 /* enforce default EH actions */
2303 if (ap
->pflags
& ATA_PFLAG_FROZEN
||
2304 all_err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
))
2305 ehc
->i
.action
|= ATA_EH_RESET
;
2306 else if (((eflags
& ATA_EFLAG_IS_IO
) && all_err_mask
) ||
2307 (!(eflags
& ATA_EFLAG_IS_IO
) && (all_err_mask
& ~AC_ERR_DEV
)))
2308 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2310 /* If we have offending qcs and the associated failed device,
2311 * perform per-dev EH action only on the offending device.
2314 ehc
->i
.dev_action
[ehc
->i
.dev
->devno
] |=
2315 ehc
->i
.action
& ATA_EH_PERDEV_MASK
;
2316 ehc
->i
.action
&= ~ATA_EH_PERDEV_MASK
;
2319 /* propagate timeout to host link */
2320 if ((all_err_mask
& AC_ERR_TIMEOUT
) && !ata_is_host_link(link
))
2321 ap
->link
.eh_context
.i
.err_mask
|= AC_ERR_TIMEOUT
;
2323 /* record error and consider speeding down */
2325 if (!dev
&& ((ata_link_max_devices(link
) == 1 &&
2326 ata_dev_enabled(link
->device
))))
2330 if (dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)
2331 eflags
|= ATA_EFLAG_DUBIOUS_XFER
;
2332 ehc
->i
.action
|= ata_eh_speed_down(dev
, eflags
, all_err_mask
);
2334 trace_ata_eh_link_autopsy(dev
, ehc
->i
.action
, all_err_mask
);
2339 * ata_eh_autopsy - analyze error and determine recovery action
2340 * @ap: host port to perform autopsy on
2342 * Analyze all links of @ap and determine why they failed and
2343 * which recovery actions are needed.
2346 * Kernel thread context (may sleep).
2348 void ata_eh_autopsy(struct ata_port
*ap
)
2350 struct ata_link
*link
;
2352 ata_for_each_link(link
, ap
, EDGE
)
2353 ata_eh_link_autopsy(link
);
2355 /* Handle the frigging slave link. Autopsy is done similarly
2356 * but actions and flags are transferred over to the master
2357 * link and handled from there.
2359 if (ap
->slave_link
) {
2360 struct ata_eh_context
*mehc
= &ap
->link
.eh_context
;
2361 struct ata_eh_context
*sehc
= &ap
->slave_link
->eh_context
;
2363 /* transfer control flags from master to slave */
2364 sehc
->i
.flags
|= mehc
->i
.flags
& ATA_EHI_TO_SLAVE_MASK
;
2366 /* perform autopsy on the slave link */
2367 ata_eh_link_autopsy(ap
->slave_link
);
2369 /* transfer actions from slave to master and clear slave */
2370 ata_eh_about_to_do(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2371 mehc
->i
.action
|= sehc
->i
.action
;
2372 mehc
->i
.dev_action
[1] |= sehc
->i
.dev_action
[1];
2373 mehc
->i
.flags
|= sehc
->i
.flags
;
2374 ata_eh_done(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2377 /* Autopsy of fanout ports can affect host link autopsy.
2378 * Perform host link autopsy last.
2380 if (sata_pmp_attached(ap
))
2381 ata_eh_link_autopsy(&ap
->link
);
2385 * ata_get_cmd_descript - get description for ATA command
2386 * @command: ATA command code to get description for
2388 * Return a textual description of the given command, or NULL if the
2389 * command is not known.
2394 const char *ata_get_cmd_descript(u8 command
)
2396 #ifdef CONFIG_ATA_VERBOSE_ERROR
2402 { ATA_CMD_DEV_RESET
, "DEVICE RESET" },
2403 { ATA_CMD_CHK_POWER
, "CHECK POWER MODE" },
2404 { ATA_CMD_STANDBY
, "STANDBY" },
2405 { ATA_CMD_IDLE
, "IDLE" },
2406 { ATA_CMD_EDD
, "EXECUTE DEVICE DIAGNOSTIC" },
2407 { ATA_CMD_DOWNLOAD_MICRO
, "DOWNLOAD MICROCODE" },
2408 { ATA_CMD_DOWNLOAD_MICRO_DMA
, "DOWNLOAD MICROCODE DMA" },
2409 { ATA_CMD_NOP
, "NOP" },
2410 { ATA_CMD_FLUSH
, "FLUSH CACHE" },
2411 { ATA_CMD_FLUSH_EXT
, "FLUSH CACHE EXT" },
2412 { ATA_CMD_ID_ATA
, "IDENTIFY DEVICE" },
2413 { ATA_CMD_ID_ATAPI
, "IDENTIFY PACKET DEVICE" },
2414 { ATA_CMD_SERVICE
, "SERVICE" },
2415 { ATA_CMD_READ
, "READ DMA" },
2416 { ATA_CMD_READ_EXT
, "READ DMA EXT" },
2417 { ATA_CMD_READ_QUEUED
, "READ DMA QUEUED" },
2418 { ATA_CMD_READ_STREAM_EXT
, "READ STREAM EXT" },
2419 { ATA_CMD_READ_STREAM_DMA_EXT
, "READ STREAM DMA EXT" },
2420 { ATA_CMD_WRITE
, "WRITE DMA" },
2421 { ATA_CMD_WRITE_EXT
, "WRITE DMA EXT" },
2422 { ATA_CMD_WRITE_QUEUED
, "WRITE DMA QUEUED EXT" },
2423 { ATA_CMD_WRITE_STREAM_EXT
, "WRITE STREAM EXT" },
2424 { ATA_CMD_WRITE_STREAM_DMA_EXT
, "WRITE STREAM DMA EXT" },
2425 { ATA_CMD_WRITE_FUA_EXT
, "WRITE DMA FUA EXT" },
2426 { ATA_CMD_WRITE_QUEUED_FUA_EXT
, "WRITE DMA QUEUED FUA EXT" },
2427 { ATA_CMD_FPDMA_READ
, "READ FPDMA QUEUED" },
2428 { ATA_CMD_FPDMA_WRITE
, "WRITE FPDMA QUEUED" },
2429 { ATA_CMD_FPDMA_SEND
, "SEND FPDMA QUEUED" },
2430 { ATA_CMD_FPDMA_RECV
, "RECEIVE FPDMA QUEUED" },
2431 { ATA_CMD_PIO_READ
, "READ SECTOR(S)" },
2432 { ATA_CMD_PIO_READ_EXT
, "READ SECTOR(S) EXT" },
2433 { ATA_CMD_PIO_WRITE
, "WRITE SECTOR(S)" },
2434 { ATA_CMD_PIO_WRITE_EXT
, "WRITE SECTOR(S) EXT" },
2435 { ATA_CMD_READ_MULTI
, "READ MULTIPLE" },
2436 { ATA_CMD_READ_MULTI_EXT
, "READ MULTIPLE EXT" },
2437 { ATA_CMD_WRITE_MULTI
, "WRITE MULTIPLE" },
2438 { ATA_CMD_WRITE_MULTI_EXT
, "WRITE MULTIPLE EXT" },
2439 { ATA_CMD_WRITE_MULTI_FUA_EXT
, "WRITE MULTIPLE FUA EXT" },
2440 { ATA_CMD_SET_FEATURES
, "SET FEATURES" },
2441 { ATA_CMD_SET_MULTI
, "SET MULTIPLE MODE" },
2442 { ATA_CMD_VERIFY
, "READ VERIFY SECTOR(S)" },
2443 { ATA_CMD_VERIFY_EXT
, "READ VERIFY SECTOR(S) EXT" },
2444 { ATA_CMD_WRITE_UNCORR_EXT
, "WRITE UNCORRECTABLE EXT" },
2445 { ATA_CMD_STANDBYNOW1
, "STANDBY IMMEDIATE" },
2446 { ATA_CMD_IDLEIMMEDIATE
, "IDLE IMMEDIATE" },
2447 { ATA_CMD_SLEEP
, "SLEEP" },
2448 { ATA_CMD_INIT_DEV_PARAMS
, "INITIALIZE DEVICE PARAMETERS" },
2449 { ATA_CMD_READ_NATIVE_MAX
, "READ NATIVE MAX ADDRESS" },
2450 { ATA_CMD_READ_NATIVE_MAX_EXT
, "READ NATIVE MAX ADDRESS EXT" },
2451 { ATA_CMD_SET_MAX
, "SET MAX ADDRESS" },
2452 { ATA_CMD_SET_MAX_EXT
, "SET MAX ADDRESS EXT" },
2453 { ATA_CMD_READ_LOG_EXT
, "READ LOG EXT" },
2454 { ATA_CMD_WRITE_LOG_EXT
, "WRITE LOG EXT" },
2455 { ATA_CMD_READ_LOG_DMA_EXT
, "READ LOG DMA EXT" },
2456 { ATA_CMD_WRITE_LOG_DMA_EXT
, "WRITE LOG DMA EXT" },
2457 { ATA_CMD_TRUSTED_NONDATA
, "TRUSTED NON-DATA" },
2458 { ATA_CMD_TRUSTED_RCV
, "TRUSTED RECEIVE" },
2459 { ATA_CMD_TRUSTED_RCV_DMA
, "TRUSTED RECEIVE DMA" },
2460 { ATA_CMD_TRUSTED_SND
, "TRUSTED SEND" },
2461 { ATA_CMD_TRUSTED_SND_DMA
, "TRUSTED SEND DMA" },
2462 { ATA_CMD_PMP_READ
, "READ BUFFER" },
2463 { ATA_CMD_PMP_READ_DMA
, "READ BUFFER DMA" },
2464 { ATA_CMD_PMP_WRITE
, "WRITE BUFFER" },
2465 { ATA_CMD_PMP_WRITE_DMA
, "WRITE BUFFER DMA" },
2466 { ATA_CMD_CONF_OVERLAY
, "DEVICE CONFIGURATION OVERLAY" },
2467 { ATA_CMD_SEC_SET_PASS
, "SECURITY SET PASSWORD" },
2468 { ATA_CMD_SEC_UNLOCK
, "SECURITY UNLOCK" },
2469 { ATA_CMD_SEC_ERASE_PREP
, "SECURITY ERASE PREPARE" },
2470 { ATA_CMD_SEC_ERASE_UNIT
, "SECURITY ERASE UNIT" },
2471 { ATA_CMD_SEC_FREEZE_LOCK
, "SECURITY FREEZE LOCK" },
2472 { ATA_CMD_SEC_DISABLE_PASS
, "SECURITY DISABLE PASSWORD" },
2473 { ATA_CMD_CONFIG_STREAM
, "CONFIGURE STREAM" },
2474 { ATA_CMD_SMART
, "SMART" },
2475 { ATA_CMD_MEDIA_LOCK
, "DOOR LOCK" },
2476 { ATA_CMD_MEDIA_UNLOCK
, "DOOR UNLOCK" },
2477 { ATA_CMD_DSM
, "DATA SET MANAGEMENT" },
2478 { ATA_CMD_CHK_MED_CRD_TYP
, "CHECK MEDIA CARD TYPE" },
2479 { ATA_CMD_CFA_REQ_EXT_ERR
, "CFA REQUEST EXTENDED ERROR" },
2480 { ATA_CMD_CFA_WRITE_NE
, "CFA WRITE SECTORS WITHOUT ERASE" },
2481 { ATA_CMD_CFA_TRANS_SECT
, "CFA TRANSLATE SECTOR" },
2482 { ATA_CMD_CFA_ERASE
, "CFA ERASE SECTORS" },
2483 { ATA_CMD_CFA_WRITE_MULT_NE
, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2484 { ATA_CMD_REQ_SENSE_DATA
, "REQUEST SENSE DATA EXT" },
2485 { ATA_CMD_SANITIZE_DEVICE
, "SANITIZE DEVICE" },
2486 { ATA_CMD_ZAC_MGMT_IN
, "ZAC MANAGEMENT IN" },
2487 { ATA_CMD_ZAC_MGMT_OUT
, "ZAC MANAGEMENT OUT" },
2488 { ATA_CMD_READ_LONG
, "READ LONG (with retries)" },
2489 { ATA_CMD_READ_LONG_ONCE
, "READ LONG (without retries)" },
2490 { ATA_CMD_WRITE_LONG
, "WRITE LONG (with retries)" },
2491 { ATA_CMD_WRITE_LONG_ONCE
, "WRITE LONG (without retries)" },
2492 { ATA_CMD_RESTORE
, "RECALIBRATE" },
2493 { 0, NULL
} /* terminate list */
2497 for (i
= 0; cmd_descr
[i
].text
; i
++)
2498 if (cmd_descr
[i
].command
== command
)
2499 return cmd_descr
[i
].text
;
2504 EXPORT_SYMBOL_GPL(ata_get_cmd_descript
);
2507 * ata_eh_link_report - report error handling to user
2508 * @link: ATA link EH is going on
2510 * Report EH to user.
2515 static void ata_eh_link_report(struct ata_link
*link
)
2517 struct ata_port
*ap
= link
->ap
;
2518 struct ata_eh_context
*ehc
= &link
->eh_context
;
2519 const char *frozen
, *desc
;
2520 char tries_buf
[6] = "";
2521 int tag
, nr_failed
= 0;
2523 if (ehc
->i
.flags
& ATA_EHI_QUIET
)
2527 if (ehc
->i
.desc
[0] != '\0')
2530 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2531 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2533 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2534 ata_dev_phys_link(qc
->dev
) != link
||
2535 ((qc
->flags
& ATA_QCFLAG_QUIET
) &&
2536 qc
->err_mask
== AC_ERR_DEV
))
2538 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
&& !qc
->err_mask
)
2544 if (!nr_failed
&& !ehc
->i
.err_mask
)
2548 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2551 if (ap
->eh_tries
< ATA_EH_MAX_TRIES
)
2552 snprintf(tries_buf
, sizeof(tries_buf
), " t%d",
2556 ata_dev_err(ehc
->i
.dev
, "exception Emask 0x%x "
2557 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2558 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2559 ehc
->i
.action
, frozen
, tries_buf
);
2561 ata_dev_err(ehc
->i
.dev
, "%s\n", desc
);
2563 ata_link_err(link
, "exception Emask 0x%x "
2564 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2565 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2566 ehc
->i
.action
, frozen
, tries_buf
);
2568 ata_link_err(link
, "%s\n", desc
);
2571 #ifdef CONFIG_ATA_VERBOSE_ERROR
2574 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2575 ehc
->i
.serror
& SERR_DATA_RECOVERED
? "RecovData " : "",
2576 ehc
->i
.serror
& SERR_COMM_RECOVERED
? "RecovComm " : "",
2577 ehc
->i
.serror
& SERR_DATA
? "UnrecovData " : "",
2578 ehc
->i
.serror
& SERR_PERSISTENT
? "Persist " : "",
2579 ehc
->i
.serror
& SERR_PROTOCOL
? "Proto " : "",
2580 ehc
->i
.serror
& SERR_INTERNAL
? "HostInt " : "",
2581 ehc
->i
.serror
& SERR_PHYRDY_CHG
? "PHYRdyChg " : "",
2582 ehc
->i
.serror
& SERR_PHY_INT_ERR
? "PHYInt " : "",
2583 ehc
->i
.serror
& SERR_COMM_WAKE
? "CommWake " : "",
2584 ehc
->i
.serror
& SERR_10B_8B_ERR
? "10B8B " : "",
2585 ehc
->i
.serror
& SERR_DISPARITY
? "Dispar " : "",
2586 ehc
->i
.serror
& SERR_CRC
? "BadCRC " : "",
2587 ehc
->i
.serror
& SERR_HANDSHAKE
? "Handshk " : "",
2588 ehc
->i
.serror
& SERR_LINK_SEQ_ERR
? "LinkSeq " : "",
2589 ehc
->i
.serror
& SERR_TRANS_ST_ERROR
? "TrStaTrns " : "",
2590 ehc
->i
.serror
& SERR_UNRECOG_FIS
? "UnrecFIS " : "",
2591 ehc
->i
.serror
& SERR_DEV_XCHG
? "DevExch " : "");
2594 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2595 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2596 struct ata_taskfile
*cmd
= &qc
->tf
, *res
= &qc
->result_tf
;
2597 char data_buf
[20] = "";
2598 char cdb_buf
[70] = "";
2600 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2601 ata_dev_phys_link(qc
->dev
) != link
|| !qc
->err_mask
)
2604 if (qc
->dma_dir
!= DMA_NONE
) {
2605 static const char *dma_str
[] = {
2606 [DMA_BIDIRECTIONAL
] = "bidi",
2607 [DMA_TO_DEVICE
] = "out",
2608 [DMA_FROM_DEVICE
] = "in",
2610 const char *prot_str
= NULL
;
2612 switch (qc
->tf
.protocol
) {
2613 case ATA_PROT_UNKNOWN
:
2614 prot_str
= "unknown";
2616 case ATA_PROT_NODATA
:
2617 prot_str
= "nodata";
2626 prot_str
= "ncq dma";
2628 case ATA_PROT_NCQ_NODATA
:
2629 prot_str
= "ncq nodata";
2631 case ATAPI_PROT_NODATA
:
2632 prot_str
= "nodata";
2634 case ATAPI_PROT_PIO
:
2637 case ATAPI_PROT_DMA
:
2641 snprintf(data_buf
, sizeof(data_buf
), " %s %u %s",
2642 prot_str
, qc
->nbytes
, dma_str
[qc
->dma_dir
]);
2645 if (ata_is_atapi(qc
->tf
.protocol
)) {
2646 const u8
*cdb
= qc
->cdb
;
2647 size_t cdb_len
= qc
->dev
->cdb_len
;
2650 cdb
= qc
->scsicmd
->cmnd
;
2651 cdb_len
= qc
->scsicmd
->cmd_len
;
2653 __scsi_format_command(cdb_buf
, sizeof(cdb_buf
),
2656 const char *descr
= ata_get_cmd_descript(cmd
->command
);
2658 ata_dev_err(qc
->dev
, "failed command: %s\n",
2662 ata_dev_err(qc
->dev
,
2663 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2665 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2666 "Emask 0x%x (%s)%s\n",
2667 cmd
->command
, cmd
->feature
, cmd
->nsect
,
2668 cmd
->lbal
, cmd
->lbam
, cmd
->lbah
,
2669 cmd
->hob_feature
, cmd
->hob_nsect
,
2670 cmd
->hob_lbal
, cmd
->hob_lbam
, cmd
->hob_lbah
,
2671 cmd
->device
, qc
->tag
, data_buf
, cdb_buf
,
2672 res
->command
, res
->feature
, res
->nsect
,
2673 res
->lbal
, res
->lbam
, res
->lbah
,
2674 res
->hob_feature
, res
->hob_nsect
,
2675 res
->hob_lbal
, res
->hob_lbam
, res
->hob_lbah
,
2676 res
->device
, qc
->err_mask
, ata_err_string(qc
->err_mask
),
2677 qc
->err_mask
& AC_ERR_NCQ
? " <F>" : "");
2679 #ifdef CONFIG_ATA_VERBOSE_ERROR
2680 if (res
->command
& (ATA_BUSY
| ATA_DRDY
| ATA_DF
| ATA_DRQ
|
2681 ATA_SENSE
| ATA_ERR
)) {
2682 if (res
->command
& ATA_BUSY
)
2683 ata_dev_err(qc
->dev
, "status: { Busy }\n");
2685 ata_dev_err(qc
->dev
, "status: { %s%s%s%s%s}\n",
2686 res
->command
& ATA_DRDY
? "DRDY " : "",
2687 res
->command
& ATA_DF
? "DF " : "",
2688 res
->command
& ATA_DRQ
? "DRQ " : "",
2689 res
->command
& ATA_SENSE
? "SENSE " : "",
2690 res
->command
& ATA_ERR
? "ERR " : "");
2693 if (cmd
->command
!= ATA_CMD_PACKET
&&
2694 (res
->feature
& (ATA_ICRC
| ATA_UNC
| ATA_AMNF
|
2695 ATA_IDNF
| ATA_ABORTED
)))
2696 ata_dev_err(qc
->dev
, "error: { %s%s%s%s%s}\n",
2697 res
->feature
& ATA_ICRC
? "ICRC " : "",
2698 res
->feature
& ATA_UNC
? "UNC " : "",
2699 res
->feature
& ATA_AMNF
? "AMNF " : "",
2700 res
->feature
& ATA_IDNF
? "IDNF " : "",
2701 res
->feature
& ATA_ABORTED
? "ABRT " : "");
2707 * ata_eh_report - report error handling to user
2708 * @ap: ATA port to report EH about
2710 * Report EH to user.
2715 void ata_eh_report(struct ata_port
*ap
)
2717 struct ata_link
*link
;
2719 ata_for_each_link(link
, ap
, HOST_FIRST
)
2720 ata_eh_link_report(link
);
2723 static int ata_do_reset(struct ata_link
*link
, ata_reset_fn_t reset
,
2724 unsigned int *classes
, unsigned long deadline
,
2727 struct ata_device
*dev
;
2730 ata_for_each_dev(dev
, link
, ALL
)
2731 classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
2733 return reset(link
, classes
, deadline
);
2736 static int ata_eh_followup_srst_needed(struct ata_link
*link
, int rc
)
2738 if ((link
->flags
& ATA_LFLAG_NO_SRST
) || ata_link_offline(link
))
2742 if (sata_pmp_supported(link
->ap
) && ata_is_host_link(link
))
2747 int ata_eh_reset(struct ata_link
*link
, int classify
,
2748 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
2749 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
2751 struct ata_port
*ap
= link
->ap
;
2752 struct ata_link
*slave
= ap
->slave_link
;
2753 struct ata_eh_context
*ehc
= &link
->eh_context
;
2754 struct ata_eh_context
*sehc
= slave
? &slave
->eh_context
: NULL
;
2755 unsigned int *classes
= ehc
->classes
;
2756 unsigned int lflags
= link
->flags
;
2757 int verbose
= !(ehc
->i
.flags
& ATA_EHI_QUIET
);
2758 int max_tries
= 0, try = 0;
2759 struct ata_link
*failed_link
;
2760 struct ata_device
*dev
;
2761 unsigned long deadline
, now
;
2762 ata_reset_fn_t reset
;
2763 unsigned long flags
;
2770 while (ata_eh_reset_timeouts
[max_tries
] != ULONG_MAX
)
2772 if (link
->flags
& ATA_LFLAG_RST_ONCE
)
2774 if (link
->flags
& ATA_LFLAG_NO_HRST
)
2776 if (link
->flags
& ATA_LFLAG_NO_SRST
)
2779 /* make sure each reset attempt is at least COOL_DOWN apart */
2780 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
2782 WARN_ON(time_after(ehc
->last_reset
, now
));
2783 deadline
= ata_deadline(ehc
->last_reset
,
2784 ATA_EH_RESET_COOL_DOWN
);
2785 if (time_before(now
, deadline
))
2786 schedule_timeout_uninterruptible(deadline
- now
);
2789 spin_lock_irqsave(ap
->lock
, flags
);
2790 ap
->pflags
|= ATA_PFLAG_RESETTING
;
2791 spin_unlock_irqrestore(ap
->lock
, flags
);
2793 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2795 ata_for_each_dev(dev
, link
, ALL
) {
2796 /* If we issue an SRST then an ATA drive (not ATAPI)
2797 * may change configuration and be in PIO0 timing. If
2798 * we do a hard reset (or are coming from power on)
2799 * this is true for ATA or ATAPI. Until we've set a
2800 * suitable controller mode we should not touch the
2801 * bus as we may be talking too fast.
2803 dev
->pio_mode
= XFER_PIO_0
;
2804 dev
->dma_mode
= 0xff;
2806 /* If the controller has a pio mode setup function
2807 * then use it to set the chipset to rights. Don't
2808 * touch the DMA setup as that will be dealt with when
2809 * configuring devices.
2811 if (ap
->ops
->set_piomode
)
2812 ap
->ops
->set_piomode(ap
, dev
);
2815 /* prefer hardreset */
2817 ehc
->i
.action
&= ~ATA_EH_RESET
;
2820 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2821 } else if (softreset
) {
2823 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2827 unsigned long deadline
= ata_deadline(jiffies
,
2828 ATA_EH_PRERESET_TIMEOUT
);
2831 sehc
->i
.action
&= ~ATA_EH_RESET
;
2832 sehc
->i
.action
|= ehc
->i
.action
;
2835 rc
= prereset(link
, deadline
);
2837 /* If present, do prereset on slave link too. Reset
2838 * is skipped iff both master and slave links report
2839 * -ENOENT or clear ATA_EH_RESET.
2841 if (slave
&& (rc
== 0 || rc
== -ENOENT
)) {
2844 tmp
= prereset(slave
, deadline
);
2848 ehc
->i
.action
|= sehc
->i
.action
;
2852 if (rc
== -ENOENT
) {
2853 ata_link_dbg(link
, "port disabled--ignoring\n");
2854 ehc
->i
.action
&= ~ATA_EH_RESET
;
2856 ata_for_each_dev(dev
, link
, ALL
)
2857 classes
[dev
->devno
] = ATA_DEV_NONE
;
2862 "prereset failed (errno=%d)\n",
2867 /* prereset() might have cleared ATA_EH_RESET. If so,
2868 * bang classes, thaw and return.
2870 if (reset
&& !(ehc
->i
.action
& ATA_EH_RESET
)) {
2871 ata_for_each_dev(dev
, link
, ALL
)
2872 classes
[dev
->devno
] = ATA_DEV_NONE
;
2873 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) &&
2874 ata_is_host_link(link
))
2875 ata_eh_thaw_port(ap
);
2885 if (ata_is_host_link(link
))
2886 ata_eh_freeze_port(ap
);
2888 deadline
= ata_deadline(jiffies
, ata_eh_reset_timeouts
[try++]);
2892 ata_link_info(link
, "%s resetting link\n",
2893 reset
== softreset
? "soft" : "hard");
2895 /* mark that this EH session started with reset */
2896 ehc
->last_reset
= jiffies
;
2897 if (reset
== hardreset
)
2898 ehc
->i
.flags
|= ATA_EHI_DID_HARDRESET
;
2900 ehc
->i
.flags
|= ATA_EHI_DID_SOFTRESET
;
2902 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2903 if (rc
&& rc
!= -EAGAIN
) {
2908 /* hardreset slave link if existent */
2909 if (slave
&& reset
== hardreset
) {
2913 ata_link_info(slave
, "hard resetting link\n");
2915 ata_eh_about_to_do(slave
, NULL
, ATA_EH_RESET
);
2916 tmp
= ata_do_reset(slave
, reset
, classes
, deadline
,
2924 failed_link
= slave
;
2930 /* perform follow-up SRST if necessary */
2931 if (reset
== hardreset
&&
2932 ata_eh_followup_srst_needed(link
, rc
)) {
2937 "follow-up softreset required but no softreset available\n");
2943 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2944 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2953 "no reset method available, skipping reset\n");
2954 if (!(lflags
& ATA_LFLAG_ASSUME_CLASS
))
2955 lflags
|= ATA_LFLAG_ASSUME_ATA
;
2959 * Post-reset processing
2961 ata_for_each_dev(dev
, link
, ALL
) {
2962 /* After the reset, the device state is PIO 0 and the
2963 * controller state is undefined. Reset also wakes up
2964 * drives from sleeping mode.
2966 dev
->pio_mode
= XFER_PIO_0
;
2967 dev
->flags
&= ~ATA_DFLAG_SLEEPING
;
2969 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
2972 /* apply class override */
2973 if (lflags
& ATA_LFLAG_ASSUME_ATA
)
2974 classes
[dev
->devno
] = ATA_DEV_ATA
;
2975 else if (lflags
& ATA_LFLAG_ASSUME_SEMB
)
2976 classes
[dev
->devno
] = ATA_DEV_SEMB_UNSUP
;
2979 /* record current link speed */
2980 if (sata_scr_read(link
, SCR_STATUS
, &sstatus
) == 0)
2981 link
->sata_spd
= (sstatus
>> 4) & 0xf;
2982 if (slave
&& sata_scr_read(slave
, SCR_STATUS
, &sstatus
) == 0)
2983 slave
->sata_spd
= (sstatus
>> 4) & 0xf;
2986 if (ata_is_host_link(link
))
2987 ata_eh_thaw_port(ap
);
2989 /* postreset() should clear hardware SError. Although SError
2990 * is cleared during link resume, clearing SError here is
2991 * necessary as some PHYs raise hotplug events after SRST.
2992 * This introduces race condition where hotplug occurs between
2993 * reset and here. This race is mediated by cross checking
2994 * link onlineness and classification result later.
2997 postreset(link
, classes
);
2999 postreset(slave
, classes
);
3003 * Some controllers can't be frozen very well and may set spurious
3004 * error conditions during reset. Clear accumulated error
3005 * information and re-thaw the port if frozen. As reset is the
3006 * final recovery action and we cross check link onlineness against
3007 * device classification later, no hotplug event is lost by this.
3009 spin_lock_irqsave(link
->ap
->lock
, flags
);
3010 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
3012 memset(&slave
->eh_info
, 0, sizeof(link
->eh_info
));
3013 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
3014 spin_unlock_irqrestore(link
->ap
->lock
, flags
);
3016 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
3017 ata_eh_thaw_port(ap
);
3020 * Make sure onlineness and classification result correspond.
3021 * Hotplug could have happened during reset and some
3022 * controllers fail to wait while a drive is spinning up after
3023 * being hotplugged causing misdetection. By cross checking
3024 * link on/offlineness and classification result, those
3025 * conditions can be reliably detected and retried.
3028 ata_for_each_dev(dev
, link
, ALL
) {
3029 if (ata_phys_link_online(ata_dev_phys_link(dev
))) {
3030 if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
3031 ata_dev_dbg(dev
, "link online but device misclassified\n");
3032 classes
[dev
->devno
] = ATA_DEV_NONE
;
3035 } else if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
3036 if (ata_class_enabled(classes
[dev
->devno
]))
3038 "link offline, clearing class %d to NONE\n",
3039 classes
[dev
->devno
]);
3040 classes
[dev
->devno
] = ATA_DEV_NONE
;
3041 } else if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
3043 "link status unknown, clearing UNKNOWN to NONE\n");
3044 classes
[dev
->devno
] = ATA_DEV_NONE
;
3048 if (classify
&& nr_unknown
) {
3049 if (try < max_tries
) {
3051 "link online but %d devices misclassified, retrying\n",
3058 "link online but %d devices misclassified, "
3059 "device detection might fail\n", nr_unknown
);
3062 /* reset successful, schedule revalidation */
3063 ata_eh_done(link
, NULL
, ATA_EH_RESET
);
3065 ata_eh_done(slave
, NULL
, ATA_EH_RESET
);
3066 ehc
->last_reset
= jiffies
; /* update to completion time */
3067 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
3068 link
->lpm_policy
= ATA_LPM_UNKNOWN
; /* reset LPM state */
3072 /* clear hotplug flag */
3073 ehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
3075 sehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
3077 spin_lock_irqsave(ap
->lock
, flags
);
3078 ap
->pflags
&= ~ATA_PFLAG_RESETTING
;
3079 spin_unlock_irqrestore(ap
->lock
, flags
);
3084 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
3085 if (!ata_is_host_link(link
) &&
3086 sata_scr_read(link
, SCR_STATUS
, &sstatus
))
3089 if (try >= max_tries
) {
3091 * Thaw host port even if reset failed, so that the port
3092 * can be retried on the next phy event. This risks
3093 * repeated EH runs but seems to be a better tradeoff than
3094 * shutting down a port after a botched hotplug attempt.
3096 if (ata_is_host_link(link
))
3097 ata_eh_thaw_port(ap
);
3102 if (time_before(now
, deadline
)) {
3103 unsigned long delta
= deadline
- now
;
3105 ata_link_warn(failed_link
,
3106 "reset failed (errno=%d), retrying in %u secs\n",
3107 rc
, DIV_ROUND_UP(jiffies_to_msecs(delta
), 1000));
3111 delta
= schedule_timeout_uninterruptible(delta
);
3116 * While disks spinup behind PMP, some controllers fail sending SRST.
3117 * They need to be reset - as well as the PMP - before retrying.
3119 if (rc
== -ERESTART
) {
3120 if (ata_is_host_link(link
))
3121 ata_eh_thaw_port(ap
);
3125 if (try == max_tries
- 1) {
3126 sata_down_spd_limit(link
, 0);
3128 sata_down_spd_limit(slave
, 0);
3129 } else if (rc
== -EPIPE
)
3130 sata_down_spd_limit(failed_link
, 0);
3137 static inline void ata_eh_pull_park_action(struct ata_port
*ap
)
3139 struct ata_link
*link
;
3140 struct ata_device
*dev
;
3141 unsigned long flags
;
3144 * This function can be thought of as an extended version of
3145 * ata_eh_about_to_do() specially crafted to accommodate the
3146 * requirements of ATA_EH_PARK handling. Since the EH thread
3147 * does not leave the do {} while () loop in ata_eh_recover as
3148 * long as the timeout for a park request to *one* device on
3149 * the port has not expired, and since we still want to pick
3150 * up park requests to other devices on the same port or
3151 * timeout updates for the same device, we have to pull
3152 * ATA_EH_PARK actions from eh_info into eh_context.i
3153 * ourselves at the beginning of each pass over the loop.
3155 * Additionally, all write accesses to &ap->park_req_pending
3156 * through reinit_completion() (see below) or complete_all()
3157 * (see ata_scsi_park_store()) are protected by the host lock.
3158 * As a result we have that park_req_pending.done is zero on
3159 * exit from this function, i.e. when ATA_EH_PARK actions for
3160 * *all* devices on port ap have been pulled into the
3161 * respective eh_context structs. If, and only if,
3162 * park_req_pending.done is non-zero by the time we reach
3163 * wait_for_completion_timeout(), another ATA_EH_PARK action
3164 * has been scheduled for at least one of the devices on port
3165 * ap and we have to cycle over the do {} while () loop in
3166 * ata_eh_recover() again.
3169 spin_lock_irqsave(ap
->lock
, flags
);
3170 reinit_completion(&ap
->park_req_pending
);
3171 ata_for_each_link(link
, ap
, EDGE
) {
3172 ata_for_each_dev(dev
, link
, ALL
) {
3173 struct ata_eh_info
*ehi
= &link
->eh_info
;
3175 link
->eh_context
.i
.dev_action
[dev
->devno
] |=
3176 ehi
->dev_action
[dev
->devno
] & ATA_EH_PARK
;
3177 ata_eh_clear_action(link
, dev
, ehi
, ATA_EH_PARK
);
3180 spin_unlock_irqrestore(ap
->lock
, flags
);
3183 static void ata_eh_park_issue_cmd(struct ata_device
*dev
, int park
)
3185 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3186 struct ata_taskfile tf
;
3187 unsigned int err_mask
;
3189 ata_tf_init(dev
, &tf
);
3191 ehc
->unloaded_mask
|= 1 << dev
->devno
;
3192 tf
.command
= ATA_CMD_IDLEIMMEDIATE
;
3198 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
3199 tf
.command
= ATA_CMD_CHK_POWER
;
3202 tf
.flags
|= ATA_TFLAG_DEVICE
| ATA_TFLAG_ISADDR
;
3203 tf
.protocol
= ATA_PROT_NODATA
;
3204 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
3205 if (park
&& (err_mask
|| tf
.lbal
!= 0xc4)) {
3206 ata_dev_err(dev
, "head unload failed!\n");
3207 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
3211 static int ata_eh_revalidate_and_attach(struct ata_link
*link
,
3212 struct ata_device
**r_failed_dev
)
3214 struct ata_port
*ap
= link
->ap
;
3215 struct ata_eh_context
*ehc
= &link
->eh_context
;
3216 struct ata_device
*dev
;
3217 unsigned int new_mask
= 0;
3218 unsigned long flags
;
3223 /* For PATA drive side cable detection to work, IDENTIFY must
3224 * be done backwards such that PDIAG- is released by the slave
3225 * device before the master device is identified.
3227 ata_for_each_dev(dev
, link
, ALL_REVERSE
) {
3228 unsigned int action
= ata_eh_dev_action(dev
);
3229 unsigned int readid_flags
= 0;
3231 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
3232 readid_flags
|= ATA_READID_POSTRESET
;
3234 if ((action
& ATA_EH_REVALIDATE
) && ata_dev_enabled(dev
)) {
3235 WARN_ON(dev
->class == ATA_DEV_PMP
);
3237 if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
3242 ata_eh_about_to_do(link
, dev
, ATA_EH_REVALIDATE
);
3243 rc
= ata_dev_revalidate(dev
, ehc
->classes
[dev
->devno
],
3248 ata_eh_done(link
, dev
, ATA_EH_REVALIDATE
);
3250 /* Configuration may have changed, reconfigure
3253 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
3255 /* schedule the scsi_rescan_device() here */
3256 schedule_work(&(ap
->scsi_rescan_task
));
3257 } else if (dev
->class == ATA_DEV_UNKNOWN
&&
3258 ehc
->tries
[dev
->devno
] &&
3259 ata_class_enabled(ehc
->classes
[dev
->devno
])) {
3260 /* Temporarily set dev->class, it will be
3261 * permanently set once all configurations are
3262 * complete. This is necessary because new
3263 * device configuration is done in two
3266 dev
->class = ehc
->classes
[dev
->devno
];
3268 if (dev
->class == ATA_DEV_PMP
)
3269 rc
= sata_pmp_attach(dev
);
3271 rc
= ata_dev_read_id(dev
, &dev
->class,
3272 readid_flags
, dev
->id
);
3274 /* read_id might have changed class, store and reset */
3275 ehc
->classes
[dev
->devno
] = dev
->class;
3276 dev
->class = ATA_DEV_UNKNOWN
;
3280 /* clear error info accumulated during probe */
3281 ata_ering_clear(&dev
->ering
);
3282 new_mask
|= 1 << dev
->devno
;
3285 /* IDENTIFY was issued to non-existent
3286 * device. No need to reset. Just
3287 * thaw and ignore the device.
3289 ata_eh_thaw_port(ap
);
3297 /* PDIAG- should have been released, ask cable type if post-reset */
3298 if ((ehc
->i
.flags
& ATA_EHI_DID_RESET
) && ata_is_host_link(link
)) {
3299 if (ap
->ops
->cable_detect
)
3300 ap
->cbl
= ap
->ops
->cable_detect(ap
);
3304 /* Configure new devices forward such that user doesn't see
3305 * device detection messages backwards.
3307 ata_for_each_dev(dev
, link
, ALL
) {
3308 if (!(new_mask
& (1 << dev
->devno
)))
3311 dev
->class = ehc
->classes
[dev
->devno
];
3313 if (dev
->class == ATA_DEV_PMP
)
3316 ehc
->i
.flags
|= ATA_EHI_PRINTINFO
;
3317 rc
= ata_dev_configure(dev
);
3318 ehc
->i
.flags
&= ~ATA_EHI_PRINTINFO
;
3320 dev
->class = ATA_DEV_UNKNOWN
;
3324 spin_lock_irqsave(ap
->lock
, flags
);
3325 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
3326 spin_unlock_irqrestore(ap
->lock
, flags
);
3328 /* new device discovered, configure xfermode */
3329 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
3335 *r_failed_dev
= dev
;
3336 DPRINTK("EXIT rc=%d\n", rc
);
3341 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3342 * @link: link on which timings will be programmed
3343 * @r_failed_dev: out parameter for failed device
3345 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3346 * ata_set_mode() fails, pointer to the failing device is
3347 * returned in @r_failed_dev.
3350 * PCI/etc. bus probe sem.
3353 * 0 on success, negative errno otherwise
3355 int ata_set_mode(struct ata_link
*link
, struct ata_device
**r_failed_dev
)
3357 struct ata_port
*ap
= link
->ap
;
3358 struct ata_device
*dev
;
3361 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
3362 ata_for_each_dev(dev
, link
, ENABLED
) {
3363 if (!(dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)) {
3364 struct ata_ering_entry
*ent
;
3366 ent
= ata_ering_top(&dev
->ering
);
3368 ent
->eflags
&= ~ATA_EFLAG_DUBIOUS_XFER
;
3372 /* has private set_mode? */
3373 if (ap
->ops
->set_mode
)
3374 rc
= ap
->ops
->set_mode(link
, r_failed_dev
);
3376 rc
= ata_do_set_mode(link
, r_failed_dev
);
3378 /* if transfer mode has changed, set DUBIOUS_XFER on device */
3379 ata_for_each_dev(dev
, link
, ENABLED
) {
3380 struct ata_eh_context
*ehc
= &link
->eh_context
;
3381 u8 saved_xfer_mode
= ehc
->saved_xfer_mode
[dev
->devno
];
3382 u8 saved_ncq
= !!(ehc
->saved_ncq_enabled
& (1 << dev
->devno
));
3384 if (dev
->xfer_mode
!= saved_xfer_mode
||
3385 ata_ncq_enabled(dev
) != saved_ncq
)
3386 dev
->flags
|= ATA_DFLAG_DUBIOUS_XFER
;
3393 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3394 * @dev: ATAPI device to clear UA for
3396 * Resets and other operations can make an ATAPI device raise
3397 * UNIT ATTENTION which causes the next operation to fail. This
3398 * function clears UA.
3401 * EH context (may sleep).
3404 * 0 on success, -errno on failure.
3406 static int atapi_eh_clear_ua(struct ata_device
*dev
)
3410 for (i
= 0; i
< ATA_EH_UA_TRIES
; i
++) {
3411 u8
*sense_buffer
= dev
->link
->ap
->sector_buf
;
3413 unsigned int err_mask
;
3415 err_mask
= atapi_eh_tur(dev
, &sense_key
);
3416 if (err_mask
!= 0 && err_mask
!= AC_ERR_DEV
) {
3418 "TEST_UNIT_READY failed (err_mask=0x%x)\n",
3423 if (!err_mask
|| sense_key
!= UNIT_ATTENTION
)
3426 err_mask
= atapi_eh_request_sense(dev
, sense_buffer
, sense_key
);
3428 ata_dev_warn(dev
, "failed to clear "
3429 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask
);
3434 ata_dev_warn(dev
, "UNIT ATTENTION persists after %d tries\n",
3441 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3442 * @dev: ATA device which may need FLUSH retry
3444 * If @dev failed FLUSH, it needs to be reported upper layer
3445 * immediately as it means that @dev failed to remap and already
3446 * lost at least a sector and further FLUSH retrials won't make
3447 * any difference to the lost sector. However, if FLUSH failed
3448 * for other reasons, for example transmission error, FLUSH needs
3451 * This function determines whether FLUSH failure retry is
3452 * necessary and performs it if so.
3455 * 0 if EH can continue, -errno if EH needs to be repeated.
3457 static int ata_eh_maybe_retry_flush(struct ata_device
*dev
)
3459 struct ata_link
*link
= dev
->link
;
3460 struct ata_port
*ap
= link
->ap
;
3461 struct ata_queued_cmd
*qc
;
3462 struct ata_taskfile tf
;
3463 unsigned int err_mask
;
3466 /* did flush fail for this device? */
3467 if (!ata_tag_valid(link
->active_tag
))
3470 qc
= __ata_qc_from_tag(ap
, link
->active_tag
);
3471 if (qc
->dev
!= dev
|| (qc
->tf
.command
!= ATA_CMD_FLUSH_EXT
&&
3472 qc
->tf
.command
!= ATA_CMD_FLUSH
))
3475 /* if the device failed it, it should be reported to upper layers */
3476 if (qc
->err_mask
& AC_ERR_DEV
)
3479 /* flush failed for some other reason, give it another shot */
3480 ata_tf_init(dev
, &tf
);
3482 tf
.command
= qc
->tf
.command
;
3483 tf
.flags
|= ATA_TFLAG_DEVICE
;
3484 tf
.protocol
= ATA_PROT_NODATA
;
3486 ata_dev_warn(dev
, "retrying FLUSH 0x%x Emask 0x%x\n",
3487 tf
.command
, qc
->err_mask
);
3489 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
3492 * FLUSH is complete but there's no way to
3493 * successfully complete a failed command from EH.
3494 * Making sure retry is allowed at least once and
3495 * retrying it should do the trick - whatever was in
3496 * the cache is already on the platter and this won't
3497 * cause infinite loop.
3499 qc
->scsicmd
->allowed
= max(qc
->scsicmd
->allowed
, 1);
3501 ata_dev_warn(dev
, "FLUSH failed Emask 0x%x\n",
3505 /* if device failed it, report it to upper layers */
3506 if (err_mask
& AC_ERR_DEV
) {
3507 qc
->err_mask
|= AC_ERR_DEV
;
3509 if (!(ap
->pflags
& ATA_PFLAG_FROZEN
))
3517 * ata_eh_set_lpm - configure SATA interface power management
3518 * @link: link to configure power management
3519 * @policy: the link power management policy
3520 * @r_failed_dev: out parameter for failed device
3522 * Enable SATA Interface power management. This will enable
3523 * Device Interface Power Management (DIPM) for min_power
3524 * policy, and then call driver specific callbacks for
3525 * enabling Host Initiated Power management.
3531 * 0 on success, -errno on failure.
3533 static int ata_eh_set_lpm(struct ata_link
*link
, enum ata_lpm_policy policy
,
3534 struct ata_device
**r_failed_dev
)
3536 struct ata_port
*ap
= ata_is_host_link(link
) ? link
->ap
: NULL
;
3537 struct ata_eh_context
*ehc
= &link
->eh_context
;
3538 struct ata_device
*dev
, *link_dev
= NULL
, *lpm_dev
= NULL
;
3539 enum ata_lpm_policy old_policy
= link
->lpm_policy
;
3540 bool no_dipm
= link
->ap
->flags
& ATA_FLAG_NO_DIPM
;
3541 unsigned int hints
= ATA_LPM_EMPTY
| ATA_LPM_HIPM
;
3542 unsigned int err_mask
;
3545 /* if the link or host doesn't do LPM, noop */
3546 if ((link
->flags
& ATA_LFLAG_NO_LPM
) || (ap
&& !ap
->ops
->set_lpm
))
3550 * DIPM is enabled only for MIN_POWER as some devices
3551 * misbehave when the host NACKs transition to SLUMBER. Order
3552 * device and link configurations such that the host always
3553 * allows DIPM requests.
3555 ata_for_each_dev(dev
, link
, ENABLED
) {
3556 bool hipm
= ata_id_has_hipm(dev
->id
);
3557 bool dipm
= ata_id_has_dipm(dev
->id
) && !no_dipm
;
3559 /* find the first enabled and LPM enabled devices */
3563 if (!lpm_dev
&& (hipm
|| dipm
))
3566 hints
&= ~ATA_LPM_EMPTY
;
3568 hints
&= ~ATA_LPM_HIPM
;
3570 /* disable DIPM before changing link config */
3571 if (policy
!= ATA_LPM_MIN_POWER
&& dipm
) {
3572 err_mask
= ata_dev_set_feature(dev
,
3573 SETFEATURES_SATA_DISABLE
, SATA_DIPM
);
3574 if (err_mask
&& err_mask
!= AC_ERR_DEV
) {
3576 "failed to disable DIPM, Emask 0x%x\n",
3585 rc
= ap
->ops
->set_lpm(link
, policy
, hints
);
3586 if (!rc
&& ap
->slave_link
)
3587 rc
= ap
->ops
->set_lpm(ap
->slave_link
, policy
, hints
);
3589 rc
= sata_pmp_set_lpm(link
, policy
, hints
);
3592 * Attribute link config failure to the first (LPM) enabled
3593 * device on the link.
3596 if (rc
== -EOPNOTSUPP
) {
3597 link
->flags
|= ATA_LFLAG_NO_LPM
;
3600 dev
= lpm_dev
? lpm_dev
: link_dev
;
3605 * Low level driver acked the transition. Issue DIPM command
3606 * with the new policy set.
3608 link
->lpm_policy
= policy
;
3609 if (ap
&& ap
->slave_link
)
3610 ap
->slave_link
->lpm_policy
= policy
;
3612 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3613 ata_for_each_dev(dev
, link
, ENABLED
) {
3614 if (policy
== ATA_LPM_MIN_POWER
&& !no_dipm
&&
3615 ata_id_has_dipm(dev
->id
)) {
3616 err_mask
= ata_dev_set_feature(dev
,
3617 SETFEATURES_SATA_ENABLE
, SATA_DIPM
);
3618 if (err_mask
&& err_mask
!= AC_ERR_DEV
) {
3620 "failed to enable DIPM, Emask 0x%x\n",
3628 link
->last_lpm_change
= jiffies
;
3629 link
->flags
|= ATA_LFLAG_CHANGED
;
3634 /* restore the old policy */
3635 link
->lpm_policy
= old_policy
;
3636 if (ap
&& ap
->slave_link
)
3637 ap
->slave_link
->lpm_policy
= old_policy
;
3639 /* if no device or only one more chance is left, disable LPM */
3640 if (!dev
|| ehc
->tries
[dev
->devno
] <= 2) {
3641 ata_link_warn(link
, "disabling LPM on the link\n");
3642 link
->flags
|= ATA_LFLAG_NO_LPM
;
3645 *r_failed_dev
= dev
;
3649 int ata_link_nr_enabled(struct ata_link
*link
)
3651 struct ata_device
*dev
;
3654 ata_for_each_dev(dev
, link
, ENABLED
)
3659 static int ata_link_nr_vacant(struct ata_link
*link
)
3661 struct ata_device
*dev
;
3664 ata_for_each_dev(dev
, link
, ALL
)
3665 if (dev
->class == ATA_DEV_UNKNOWN
)
3670 static int ata_eh_skip_recovery(struct ata_link
*link
)
3672 struct ata_port
*ap
= link
->ap
;
3673 struct ata_eh_context
*ehc
= &link
->eh_context
;
3674 struct ata_device
*dev
;
3676 /* skip disabled links */
3677 if (link
->flags
& ATA_LFLAG_DISABLED
)
3680 /* skip if explicitly requested */
3681 if (ehc
->i
.flags
& ATA_EHI_NO_RECOVERY
)
3684 /* thaw frozen port and recover failed devices */
3685 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) || ata_link_nr_enabled(link
))
3688 /* reset at least once if reset is requested */
3689 if ((ehc
->i
.action
& ATA_EH_RESET
) &&
3690 !(ehc
->i
.flags
& ATA_EHI_DID_RESET
))
3693 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
3694 ata_for_each_dev(dev
, link
, ALL
) {
3695 if (dev
->class == ATA_DEV_UNKNOWN
&&
3696 ehc
->classes
[dev
->devno
] != ATA_DEV_NONE
)
3703 static int ata_count_probe_trials_cb(struct ata_ering_entry
*ent
, void *void_arg
)
3705 u64 interval
= msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL
);
3706 u64 now
= get_jiffies_64();
3707 int *trials
= void_arg
;
3709 if ((ent
->eflags
& ATA_EFLAG_OLD_ER
) ||
3710 (ent
->timestamp
< now
- min(now
, interval
)))
3717 static int ata_eh_schedule_probe(struct ata_device
*dev
)
3719 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3720 struct ata_link
*link
= ata_dev_phys_link(dev
);
3723 if (!(ehc
->i
.probe_mask
& (1 << dev
->devno
)) ||
3724 (ehc
->did_probe_mask
& (1 << dev
->devno
)))
3727 ata_eh_detach_dev(dev
);
3729 ehc
->did_probe_mask
|= (1 << dev
->devno
);
3730 ehc
->i
.action
|= ATA_EH_RESET
;
3731 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
3732 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
3734 /* the link maybe in a deep sleep, wake it up */
3735 if (link
->lpm_policy
> ATA_LPM_MAX_POWER
) {
3736 if (ata_is_host_link(link
))
3737 link
->ap
->ops
->set_lpm(link
, ATA_LPM_MAX_POWER
,
3740 sata_pmp_set_lpm(link
, ATA_LPM_MAX_POWER
,
3744 /* Record and count probe trials on the ering. The specific
3745 * error mask used is irrelevant. Because a successful device
3746 * detection clears the ering, this count accumulates only if
3747 * there are consecutive failed probes.
3749 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3750 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3751 * forced to 1.5Gbps.
3753 * This is to work around cases where failed link speed
3754 * negotiation results in device misdetection leading to
3755 * infinite DEVXCHG or PHRDY CHG events.
3757 ata_ering_record(&dev
->ering
, 0, AC_ERR_OTHER
);
3758 ata_ering_map(&dev
->ering
, ata_count_probe_trials_cb
, &trials
);
3760 if (trials
> ATA_EH_PROBE_TRIALS
)
3761 sata_down_spd_limit(link
, 1);
3766 static int ata_eh_handle_dev_fail(struct ata_device
*dev
, int err
)
3768 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3770 /* -EAGAIN from EH routine indicates retry without prejudice.
3771 * The requester is responsible for ensuring forward progress.
3774 ehc
->tries
[dev
->devno
]--;
3778 /* device missing or wrong IDENTIFY data, schedule probing */
3779 ehc
->i
.probe_mask
|= (1 << dev
->devno
);
3781 /* give it just one more chance */
3782 ehc
->tries
[dev
->devno
] = min(ehc
->tries
[dev
->devno
], 1);
3784 if (ehc
->tries
[dev
->devno
] == 1) {
3785 /* This is the last chance, better to slow
3786 * down than lose it.
3788 sata_down_spd_limit(ata_dev_phys_link(dev
), 0);
3789 if (dev
->pio_mode
> XFER_PIO_0
)
3790 ata_down_xfermask_limit(dev
, ATA_DNXFER_PIO
);
3794 if (ata_dev_enabled(dev
) && !ehc
->tries
[dev
->devno
]) {
3795 /* disable device if it has used up all its chances */
3796 ata_dev_disable(dev
);
3798 /* detach if offline */
3799 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
3800 ata_eh_detach_dev(dev
);
3802 /* schedule probe if necessary */
3803 if (ata_eh_schedule_probe(dev
)) {
3804 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3805 memset(ehc
->cmd_timeout_idx
[dev
->devno
], 0,
3806 sizeof(ehc
->cmd_timeout_idx
[dev
->devno
]));
3811 ehc
->i
.action
|= ATA_EH_RESET
;
3817 * ata_eh_recover - recover host port after error
3818 * @ap: host port to recover
3819 * @prereset: prereset method (can be NULL)
3820 * @softreset: softreset method (can be NULL)
3821 * @hardreset: hardreset method (can be NULL)
3822 * @postreset: postreset method (can be NULL)
3823 * @r_failed_link: out parameter for failed link
3825 * This is the alpha and omega, eum and yang, heart and soul of
3826 * libata exception handling. On entry, actions required to
3827 * recover each link and hotplug requests are recorded in the
3828 * link's eh_context. This function executes all the operations
3829 * with appropriate retrials and fallbacks to resurrect failed
3830 * devices, detach goners and greet newcomers.
3833 * Kernel thread context (may sleep).
3836 * 0 on success, -errno on failure.
3838 int ata_eh_recover(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3839 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3840 ata_postreset_fn_t postreset
,
3841 struct ata_link
**r_failed_link
)
3843 struct ata_link
*link
;
3844 struct ata_device
*dev
;
3846 unsigned long flags
, deadline
;
3850 /* prep for recovery */
3851 ata_for_each_link(link
, ap
, EDGE
) {
3852 struct ata_eh_context
*ehc
= &link
->eh_context
;
3854 /* re-enable link? */
3855 if (ehc
->i
.action
& ATA_EH_ENABLE_LINK
) {
3856 ata_eh_about_to_do(link
, NULL
, ATA_EH_ENABLE_LINK
);
3857 spin_lock_irqsave(ap
->lock
, flags
);
3858 link
->flags
&= ~ATA_LFLAG_DISABLED
;
3859 spin_unlock_irqrestore(ap
->lock
, flags
);
3860 ata_eh_done(link
, NULL
, ATA_EH_ENABLE_LINK
);
3863 ata_for_each_dev(dev
, link
, ALL
) {
3864 if (link
->flags
& ATA_LFLAG_NO_RETRY
)
3865 ehc
->tries
[dev
->devno
] = 1;
3867 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3869 /* collect port action mask recorded in dev actions */
3870 ehc
->i
.action
|= ehc
->i
.dev_action
[dev
->devno
] &
3871 ~ATA_EH_PERDEV_MASK
;
3872 ehc
->i
.dev_action
[dev
->devno
] &= ATA_EH_PERDEV_MASK
;
3874 /* process hotplug request */
3875 if (dev
->flags
& ATA_DFLAG_DETACH
)
3876 ata_eh_detach_dev(dev
);
3878 /* schedule probe if necessary */
3879 if (!ata_dev_enabled(dev
))
3880 ata_eh_schedule_probe(dev
);
3887 /* if UNLOADING, finish immediately */
3888 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
3892 ata_for_each_link(link
, ap
, EDGE
) {
3893 struct ata_eh_context
*ehc
= &link
->eh_context
;
3895 /* skip EH if possible. */
3896 if (ata_eh_skip_recovery(link
))
3899 ata_for_each_dev(dev
, link
, ALL
)
3900 ehc
->classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
3904 ata_for_each_link(link
, ap
, EDGE
) {
3905 struct ata_eh_context
*ehc
= &link
->eh_context
;
3907 if (!(ehc
->i
.action
& ATA_EH_RESET
))
3910 rc
= ata_eh_reset(link
, ata_link_nr_vacant(link
),
3911 prereset
, softreset
, hardreset
, postreset
);
3913 ata_link_err(link
, "reset failed, giving up\n");
3922 * clears ATA_EH_PARK in eh_info and resets
3923 * ap->park_req_pending
3925 ata_eh_pull_park_action(ap
);
3928 ata_for_each_link(link
, ap
, EDGE
) {
3929 ata_for_each_dev(dev
, link
, ALL
) {
3930 struct ata_eh_context
*ehc
= &link
->eh_context
;
3933 if (dev
->class != ATA_DEV_ATA
&&
3934 dev
->class != ATA_DEV_ZAC
)
3936 if (!(ehc
->i
.dev_action
[dev
->devno
] &
3939 tmp
= dev
->unpark_deadline
;
3940 if (time_before(deadline
, tmp
))
3942 else if (time_before_eq(tmp
, jiffies
))
3944 if (ehc
->unloaded_mask
& (1 << dev
->devno
))
3947 ata_eh_park_issue_cmd(dev
, 1);
3952 if (time_before_eq(deadline
, now
))
3956 deadline
= wait_for_completion_timeout(&ap
->park_req_pending
,
3960 ata_for_each_link(link
, ap
, EDGE
) {
3961 ata_for_each_dev(dev
, link
, ALL
) {
3962 if (!(link
->eh_context
.unloaded_mask
&
3966 ata_eh_park_issue_cmd(dev
, 0);
3967 ata_eh_done(link
, dev
, ATA_EH_PARK
);
3973 ata_for_each_link(link
, ap
, PMP_FIRST
) {
3974 struct ata_eh_context
*ehc
= &link
->eh_context
;
3976 if (sata_pmp_attached(ap
) && ata_is_host_link(link
))
3979 /* revalidate existing devices and attach new ones */
3980 rc
= ata_eh_revalidate_and_attach(link
, &dev
);
3984 /* if PMP got attached, return, pmp EH will take care of it */
3985 if (link
->device
->class == ATA_DEV_PMP
) {
3990 /* configure transfer mode if necessary */
3991 if (ehc
->i
.flags
& ATA_EHI_SETMODE
) {
3992 rc
= ata_set_mode(link
, &dev
);
3995 ehc
->i
.flags
&= ~ATA_EHI_SETMODE
;
3998 /* If reset has been issued, clear UA to avoid
3999 * disrupting the current users of the device.
4001 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
4002 ata_for_each_dev(dev
, link
, ALL
) {
4003 if (dev
->class != ATA_DEV_ATAPI
)
4005 rc
= atapi_eh_clear_ua(dev
);
4008 if (zpodd_dev_enabled(dev
))
4009 zpodd_post_poweron(dev
);
4013 /* retry flush if necessary */
4014 ata_for_each_dev(dev
, link
, ALL
) {
4015 if (dev
->class != ATA_DEV_ATA
&&
4016 dev
->class != ATA_DEV_ZAC
)
4018 rc
= ata_eh_maybe_retry_flush(dev
);
4024 /* configure link power saving */
4025 if (link
->lpm_policy
!= ap
->target_lpm_policy
) {
4026 rc
= ata_eh_set_lpm(link
, ap
->target_lpm_policy
, &dev
);
4031 /* this link is okay now */
4038 ata_eh_handle_dev_fail(dev
, rc
);
4040 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
4041 /* PMP reset requires working host port.
4042 * Can't retry if it's frozen.
4044 if (sata_pmp_attached(ap
))
4054 if (rc
&& r_failed_link
)
4055 *r_failed_link
= link
;
4057 DPRINTK("EXIT, rc=%d\n", rc
);
4062 * ata_eh_finish - finish up EH
4063 * @ap: host port to finish EH for
4065 * Recovery is complete. Clean up EH states and retry or finish
4071 void ata_eh_finish(struct ata_port
*ap
)
4075 /* retry or finish qcs */
4076 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
4077 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
4079 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
4083 /* FIXME: Once EH migration is complete,
4084 * generate sense data in this function,
4085 * considering both err_mask and tf.
4087 if (qc
->flags
& ATA_QCFLAG_RETRY
)
4088 ata_eh_qc_retry(qc
);
4090 ata_eh_qc_complete(qc
);
4092 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
4093 ata_eh_qc_complete(qc
);
4095 /* feed zero TF to sense generation */
4096 memset(&qc
->result_tf
, 0, sizeof(qc
->result_tf
));
4097 ata_eh_qc_retry(qc
);
4102 /* make sure nr_active_links is zero after EH */
4103 WARN_ON(ap
->nr_active_links
);
4104 ap
->nr_active_links
= 0;
4108 * ata_do_eh - do standard error handling
4109 * @ap: host port to handle error for
4111 * @prereset: prereset method (can be NULL)
4112 * @softreset: softreset method (can be NULL)
4113 * @hardreset: hardreset method (can be NULL)
4114 * @postreset: postreset method (can be NULL)
4116 * Perform standard error handling sequence.
4119 * Kernel thread context (may sleep).
4121 void ata_do_eh(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
4122 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
4123 ata_postreset_fn_t postreset
)
4125 struct ata_device
*dev
;
4131 rc
= ata_eh_recover(ap
, prereset
, softreset
, hardreset
, postreset
,
4134 ata_for_each_dev(dev
, &ap
->link
, ALL
)
4135 ata_dev_disable(dev
);
4142 * ata_std_error_handler - standard error handler
4143 * @ap: host port to handle error for
4145 * Standard error handler
4148 * Kernel thread context (may sleep).
4150 void ata_std_error_handler(struct ata_port
*ap
)
4152 struct ata_port_operations
*ops
= ap
->ops
;
4153 ata_reset_fn_t hardreset
= ops
->hardreset
;
4155 /* ignore built-in hardreset if SCR access is not available */
4156 if (hardreset
== sata_std_hardreset
&& !sata_scr_valid(&ap
->link
))
4159 ata_do_eh(ap
, ops
->prereset
, ops
->softreset
, hardreset
, ops
->postreset
);
4164 * ata_eh_handle_port_suspend - perform port suspend operation
4165 * @ap: port to suspend
4170 * Kernel thread context (may sleep).
4172 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
4174 unsigned long flags
;
4176 struct ata_device
*dev
;
4178 /* are we suspending? */
4179 spin_lock_irqsave(ap
->lock
, flags
);
4180 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
4181 ap
->pm_mesg
.event
& PM_EVENT_RESUME
) {
4182 spin_unlock_irqrestore(ap
->lock
, flags
);
4185 spin_unlock_irqrestore(ap
->lock
, flags
);
4187 WARN_ON(ap
->pflags
& ATA_PFLAG_SUSPENDED
);
4190 * If we have a ZPODD attached, check its zero
4191 * power ready status before the port is frozen.
4192 * Only needed for runtime suspend.
4194 if (PMSG_IS_AUTO(ap
->pm_mesg
)) {
4195 ata_for_each_dev(dev
, &ap
->link
, ENABLED
) {
4196 if (zpodd_dev_enabled(dev
))
4197 zpodd_on_suspend(dev
);
4201 /* tell ACPI we're suspending */
4202 rc
= ata_acpi_on_suspend(ap
);
4207 ata_eh_freeze_port(ap
);
4209 if (ap
->ops
->port_suspend
)
4210 rc
= ap
->ops
->port_suspend(ap
, ap
->pm_mesg
);
4212 ata_acpi_set_state(ap
, ap
->pm_mesg
);
4214 /* update the flags */
4215 spin_lock_irqsave(ap
->lock
, flags
);
4217 ap
->pflags
&= ~ATA_PFLAG_PM_PENDING
;
4219 ap
->pflags
|= ATA_PFLAG_SUSPENDED
;
4220 else if (ap
->pflags
& ATA_PFLAG_FROZEN
)
4221 ata_port_schedule_eh(ap
);
4223 spin_unlock_irqrestore(ap
->lock
, flags
);
4229 * ata_eh_handle_port_resume - perform port resume operation
4230 * @ap: port to resume
4235 * Kernel thread context (may sleep).
4237 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
4239 struct ata_link
*link
;
4240 struct ata_device
*dev
;
4241 unsigned long flags
;
4244 /* are we resuming? */
4245 spin_lock_irqsave(ap
->lock
, flags
);
4246 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
4247 !(ap
->pm_mesg
.event
& PM_EVENT_RESUME
)) {
4248 spin_unlock_irqrestore(ap
->lock
, flags
);
4251 spin_unlock_irqrestore(ap
->lock
, flags
);
4253 WARN_ON(!(ap
->pflags
& ATA_PFLAG_SUSPENDED
));
4256 * Error timestamps are in jiffies which doesn't run while
4257 * suspended and PHY events during resume isn't too uncommon.
4258 * When the two are combined, it can lead to unnecessary speed
4259 * downs if the machine is suspended and resumed repeatedly.
4260 * Clear error history.
4262 ata_for_each_link(link
, ap
, HOST_FIRST
)
4263 ata_for_each_dev(dev
, link
, ALL
)
4264 ata_ering_clear(&dev
->ering
);
4266 ata_acpi_set_state(ap
, ap
->pm_mesg
);
4268 if (ap
->ops
->port_resume
)
4269 rc
= ap
->ops
->port_resume(ap
);
4271 /* tell ACPI that we're resuming */
4272 ata_acpi_on_resume(ap
);
4274 /* update the flags */
4275 spin_lock_irqsave(ap
->lock
, flags
);
4276 ap
->pflags
&= ~(ATA_PFLAG_PM_PENDING
| ATA_PFLAG_SUSPENDED
);
4277 spin_unlock_irqrestore(ap
->lock
, flags
);
4279 #endif /* CONFIG_PM */