2 * libata-eh.c - libata error handling
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2006 Tejun Heo <htejun@gmail.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/kernel.h>
36 #include <linux/pci.h>
37 #include <scsi/scsi.h>
38 #include <scsi/scsi_host.h>
39 #include <scsi/scsi_eh.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_cmnd.h>
42 #include "../scsi/scsi_transport_api.h"
44 #include <linux/libata.h>
49 /* speed down verdicts */
50 ATA_EH_SPDN_NCQ_OFF
= (1 << 0),
51 ATA_EH_SPDN_SPEED_DOWN
= (1 << 1),
52 ATA_EH_SPDN_FALLBACK_TO_PIO
= (1 << 2),
53 ATA_EH_SPDN_KEEP_ERRORS
= (1 << 3),
56 ATA_EFLAG_IS_IO
= (1 << 0),
57 ATA_EFLAG_DUBIOUS_XFER
= (1 << 1),
59 /* error categories */
62 ATA_ECAT_TOUT_HSM
= 2,
64 ATA_ECAT_DUBIOUS_NONE
= 4,
65 ATA_ECAT_DUBIOUS_ATA_BUS
= 5,
66 ATA_ECAT_DUBIOUS_TOUT_HSM
= 6,
67 ATA_ECAT_DUBIOUS_UNK_DEV
= 7,
70 ATA_EH_CMD_DFL_TIMEOUT
= 5000,
72 /* always put at least this amount of time between resets */
73 ATA_EH_RESET_COOL_DOWN
= 5000,
75 /* Waiting in ->prereset can never be reliable. It's
76 * sometimes nice to wait there but it can't be depended upon;
77 * otherwise, we wouldn't be resetting. Just give it enough
78 * time for most drives to spin up.
80 ATA_EH_PRERESET_TIMEOUT
= 10000,
81 ATA_EH_FASTDRAIN_INTERVAL
= 3000,
86 /* The following table determines how we sequence resets. Each entry
87 * represents timeout for that try. The first try can be soft or
88 * hardreset. All others are hardreset if available. In most cases
89 * the first reset w/ 10sec timeout should succeed. Following entries
90 * are mostly for error handling, hotplug and retarded devices.
92 static const unsigned long ata_eh_reset_timeouts
[] = {
93 10000, /* most drives spin up by 10sec */
94 10000, /* > 99% working drives spin up before 20sec */
95 35000, /* give > 30 secs of idleness for retarded devices */
96 5000, /* and sweet one last chance */
97 ULONG_MAX
, /* > 1 min has elapsed, give up */
100 static const unsigned long ata_eh_identify_timeouts
[] = {
101 5000, /* covers > 99% of successes and not too boring on failures */
102 10000, /* combined time till here is enough even for media access */
103 30000, /* for true idiots */
107 static const unsigned long ata_eh_other_timeouts
[] = {
108 5000, /* same rationale as identify timeout */
110 /* but no merciful 30sec for other commands, it just isn't worth it */
114 struct ata_eh_cmd_timeout_ent
{
116 const unsigned long *timeouts
;
119 /* The following table determines timeouts to use for EH internal
120 * commands. Each table entry is a command class and matches the
121 * commands the entry applies to and the timeout table to use.
123 * On the retry after a command timed out, the next timeout value from
124 * the table is used. If the table doesn't contain further entries,
125 * the last value is used.
127 * ehc->cmd_timeout_idx keeps track of which timeout to use per
128 * command class, so if SET_FEATURES times out on the first try, the
129 * next try will use the second timeout value only for that class.
131 #define CMDS(cmds...) (const u8 []){ cmds, 0 }
132 static const struct ata_eh_cmd_timeout_ent
133 ata_eh_cmd_timeout_table
[ATA_EH_CMD_TIMEOUT_TABLE_SIZE
] = {
134 { .commands
= CMDS(ATA_CMD_ID_ATA
, ATA_CMD_ID_ATAPI
),
135 .timeouts
= ata_eh_identify_timeouts
, },
136 { .commands
= CMDS(ATA_CMD_READ_NATIVE_MAX
, ATA_CMD_READ_NATIVE_MAX_EXT
),
137 .timeouts
= ata_eh_other_timeouts
, },
138 { .commands
= CMDS(ATA_CMD_SET_MAX
, ATA_CMD_SET_MAX_EXT
),
139 .timeouts
= ata_eh_other_timeouts
, },
140 { .commands
= CMDS(ATA_CMD_SET_FEATURES
),
141 .timeouts
= ata_eh_other_timeouts
, },
142 { .commands
= CMDS(ATA_CMD_INIT_DEV_PARAMS
),
143 .timeouts
= ata_eh_other_timeouts
, },
147 static void __ata_port_freeze(struct ata_port
*ap
);
149 static void ata_eh_handle_port_suspend(struct ata_port
*ap
);
150 static void ata_eh_handle_port_resume(struct ata_port
*ap
);
151 #else /* CONFIG_PM */
152 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
155 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
157 #endif /* CONFIG_PM */
159 static void __ata_ehi_pushv_desc(struct ata_eh_info
*ehi
, const char *fmt
,
162 ehi
->desc_len
+= vscnprintf(ehi
->desc
+ ehi
->desc_len
,
163 ATA_EH_DESC_LEN
- ehi
->desc_len
,
168 * __ata_ehi_push_desc - push error description without adding separator
170 * @fmt: printf format string
172 * Format string according to @fmt and append it to @ehi->desc.
175 * spin_lock_irqsave(host lock)
177 void __ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
182 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
187 * ata_ehi_push_desc - push error description with separator
189 * @fmt: printf format string
191 * Format string according to @fmt and append it to @ehi->desc.
192 * If @ehi->desc is not empty, ", " is added in-between.
195 * spin_lock_irqsave(host lock)
197 void ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
202 __ata_ehi_push_desc(ehi
, ", ");
205 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
210 * ata_ehi_clear_desc - clean error description
216 * spin_lock_irqsave(host lock)
218 void ata_ehi_clear_desc(struct ata_eh_info
*ehi
)
225 * ata_port_desc - append port description
226 * @ap: target ATA port
227 * @fmt: printf format string
229 * Format string according to @fmt and append it to port
230 * description. If port description is not empty, " " is added
231 * in-between. This function is to be used while initializing
232 * ata_host. The description is printed on host registration.
237 void ata_port_desc(struct ata_port
*ap
, const char *fmt
, ...)
241 WARN_ON(!(ap
->pflags
& ATA_PFLAG_INITIALIZING
));
243 if (ap
->link
.eh_info
.desc_len
)
244 __ata_ehi_push_desc(&ap
->link
.eh_info
, " ");
247 __ata_ehi_pushv_desc(&ap
->link
.eh_info
, fmt
, args
);
254 * ata_port_pbar_desc - append PCI BAR description
255 * @ap: target ATA port
256 * @bar: target PCI BAR
257 * @offset: offset into PCI BAR
258 * @name: name of the area
260 * If @offset is negative, this function formats a string which
261 * contains the name, address, size and type of the BAR and
262 * appends it to the port description. If @offset is zero or
263 * positive, only name and offsetted address is appended.
268 void ata_port_pbar_desc(struct ata_port
*ap
, int bar
, ssize_t offset
,
271 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
273 unsigned long long start
, len
;
275 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
277 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
280 start
= (unsigned long long)pci_resource_start(pdev
, bar
);
281 len
= (unsigned long long)pci_resource_len(pdev
, bar
);
284 ata_port_desc(ap
, "%s %s%llu@0x%llx", name
, type
, len
, start
);
286 ata_port_desc(ap
, "%s 0x%llx", name
,
287 start
+ (unsigned long long)offset
);
290 #endif /* CONFIG_PCI */
292 static int ata_lookup_timeout_table(u8 cmd
)
296 for (i
= 0; i
< ATA_EH_CMD_TIMEOUT_TABLE_SIZE
; i
++) {
299 for (cur
= ata_eh_cmd_timeout_table
[i
].commands
; *cur
; cur
++)
308 * ata_internal_cmd_timeout - determine timeout for an internal command
309 * @dev: target device
310 * @cmd: internal command to be issued
312 * Determine timeout for internal command @cmd for @dev.
318 * Determined timeout.
320 unsigned long ata_internal_cmd_timeout(struct ata_device
*dev
, u8 cmd
)
322 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
323 int ent
= ata_lookup_timeout_table(cmd
);
327 return ATA_EH_CMD_DFL_TIMEOUT
;
329 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
330 return ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
];
334 * ata_internal_cmd_timed_out - notification for internal command timeout
335 * @dev: target device
336 * @cmd: internal command which timed out
338 * Notify EH that internal command @cmd for @dev timed out. This
339 * function should be called only for commands whose timeouts are
340 * determined using ata_internal_cmd_timeout().
345 void ata_internal_cmd_timed_out(struct ata_device
*dev
, u8 cmd
)
347 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
348 int ent
= ata_lookup_timeout_table(cmd
);
354 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
355 if (ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
+ 1] != ULONG_MAX
)
356 ehc
->cmd_timeout_idx
[dev
->devno
][ent
]++;
359 static void ata_ering_record(struct ata_ering
*ering
, unsigned int eflags
,
360 unsigned int err_mask
)
362 struct ata_ering_entry
*ent
;
367 ering
->cursor
%= ATA_ERING_SIZE
;
369 ent
= &ering
->ring
[ering
->cursor
];
370 ent
->eflags
= eflags
;
371 ent
->err_mask
= err_mask
;
372 ent
->timestamp
= get_jiffies_64();
375 static struct ata_ering_entry
*ata_ering_top(struct ata_ering
*ering
)
377 struct ata_ering_entry
*ent
= &ering
->ring
[ering
->cursor
];
384 static void ata_ering_clear(struct ata_ering
*ering
)
386 memset(ering
, 0, sizeof(*ering
));
389 static int ata_ering_map(struct ata_ering
*ering
,
390 int (*map_fn
)(struct ata_ering_entry
*, void *),
394 struct ata_ering_entry
*ent
;
398 ent
= &ering
->ring
[idx
];
401 rc
= map_fn(ent
, arg
);
404 idx
= (idx
- 1 + ATA_ERING_SIZE
) % ATA_ERING_SIZE
;
405 } while (idx
!= ering
->cursor
);
410 static unsigned int ata_eh_dev_action(struct ata_device
*dev
)
412 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
414 return ehc
->i
.action
| ehc
->i
.dev_action
[dev
->devno
];
417 static void ata_eh_clear_action(struct ata_link
*link
, struct ata_device
*dev
,
418 struct ata_eh_info
*ehi
, unsigned int action
)
420 struct ata_device
*tdev
;
423 ehi
->action
&= ~action
;
424 ata_link_for_each_dev(tdev
, link
)
425 ehi
->dev_action
[tdev
->devno
] &= ~action
;
427 /* doesn't make sense for port-wide EH actions */
428 WARN_ON(!(action
& ATA_EH_PERDEV_MASK
));
430 /* break ehi->action into ehi->dev_action */
431 if (ehi
->action
& action
) {
432 ata_link_for_each_dev(tdev
, link
)
433 ehi
->dev_action
[tdev
->devno
] |=
434 ehi
->action
& action
;
435 ehi
->action
&= ~action
;
438 /* turn off the specified per-dev action */
439 ehi
->dev_action
[dev
->devno
] &= ~action
;
444 * ata_scsi_timed_out - SCSI layer time out callback
445 * @cmd: timed out SCSI command
447 * Handles SCSI layer timeout. We race with normal completion of
448 * the qc for @cmd. If the qc is already gone, we lose and let
449 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
450 * timed out and EH should be invoked. Prevent ata_qc_complete()
451 * from finishing it by setting EH_SCHEDULED and return
454 * TODO: kill this function once old EH is gone.
457 * Called from timer context
460 * EH_HANDLED or EH_NOT_HANDLED
462 enum scsi_eh_timer_return
ata_scsi_timed_out(struct scsi_cmnd
*cmd
)
464 struct Scsi_Host
*host
= cmd
->device
->host
;
465 struct ata_port
*ap
= ata_shost_to_port(host
);
467 struct ata_queued_cmd
*qc
;
468 enum scsi_eh_timer_return ret
;
472 if (ap
->ops
->error_handler
) {
473 ret
= EH_NOT_HANDLED
;
478 spin_lock_irqsave(ap
->lock
, flags
);
479 qc
= ata_qc_from_tag(ap
, ap
->link
.active_tag
);
481 WARN_ON(qc
->scsicmd
!= cmd
);
482 qc
->flags
|= ATA_QCFLAG_EH_SCHEDULED
;
483 qc
->err_mask
|= AC_ERR_TIMEOUT
;
484 ret
= EH_NOT_HANDLED
;
486 spin_unlock_irqrestore(ap
->lock
, flags
);
489 DPRINTK("EXIT, ret=%d\n", ret
);
494 * ata_scsi_error - SCSI layer error handler callback
495 * @host: SCSI host on which error occurred
497 * Handles SCSI-layer-thrown error events.
500 * Inherited from SCSI layer (none, can sleep)
505 void ata_scsi_error(struct Scsi_Host
*host
)
507 struct ata_port
*ap
= ata_shost_to_port(host
);
513 /* synchronize with port task */
514 ata_port_flush_task(ap
);
516 /* synchronize with host lock and sort out timeouts */
518 /* For new EH, all qcs are finished in one of three ways -
519 * normal completion, error completion, and SCSI timeout.
520 * Both cmpletions can race against SCSI timeout. When normal
521 * completion wins, the qc never reaches EH. When error
522 * completion wins, the qc has ATA_QCFLAG_FAILED set.
524 * When SCSI timeout wins, things are a bit more complex.
525 * Normal or error completion can occur after the timeout but
526 * before this point. In such cases, both types of
527 * completions are honored. A scmd is determined to have
528 * timed out iff its associated qc is active and not failed.
530 if (ap
->ops
->error_handler
) {
531 struct scsi_cmnd
*scmd
, *tmp
;
534 spin_lock_irqsave(ap
->lock
, flags
);
536 list_for_each_entry_safe(scmd
, tmp
, &host
->eh_cmd_q
, eh_entry
) {
537 struct ata_queued_cmd
*qc
;
539 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
540 qc
= __ata_qc_from_tag(ap
, i
);
541 if (qc
->flags
& ATA_QCFLAG_ACTIVE
&&
546 if (i
< ATA_MAX_QUEUE
) {
547 /* the scmd has an associated qc */
548 if (!(qc
->flags
& ATA_QCFLAG_FAILED
)) {
549 /* which hasn't failed yet, timeout */
550 qc
->err_mask
|= AC_ERR_TIMEOUT
;
551 qc
->flags
|= ATA_QCFLAG_FAILED
;
555 /* Normal completion occurred after
556 * SCSI timeout but before this point.
557 * Successfully complete it.
559 scmd
->retries
= scmd
->allowed
;
560 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
564 /* If we have timed out qcs. They belong to EH from
565 * this point but the state of the controller is
566 * unknown. Freeze the port to make sure the IRQ
567 * handler doesn't diddle with those qcs. This must
568 * be done atomically w.r.t. setting QCFLAG_FAILED.
571 __ata_port_freeze(ap
);
573 spin_unlock_irqrestore(ap
->lock
, flags
);
575 /* initialize eh_tries */
576 ap
->eh_tries
= ATA_EH_MAX_TRIES
;
578 spin_unlock_wait(ap
->lock
);
581 /* invoke error handler */
582 if (ap
->ops
->error_handler
) {
583 struct ata_link
*link
;
585 /* kill fast drain timer */
586 del_timer_sync(&ap
->fastdrain_timer
);
588 /* process port resume request */
589 ata_eh_handle_port_resume(ap
);
591 /* fetch & clear EH info */
592 spin_lock_irqsave(ap
->lock
, flags
);
594 __ata_port_for_each_link(link
, ap
) {
595 struct ata_eh_context
*ehc
= &link
->eh_context
;
596 struct ata_device
*dev
;
598 memset(&link
->eh_context
, 0, sizeof(link
->eh_context
));
599 link
->eh_context
.i
= link
->eh_info
;
600 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
602 ata_link_for_each_dev(dev
, link
) {
603 int devno
= dev
->devno
;
605 ehc
->saved_xfer_mode
[devno
] = dev
->xfer_mode
;
606 if (ata_ncq_enabled(dev
))
607 ehc
->saved_ncq_enabled
|= 1 << devno
;
610 /* set last reset timestamp to some time in the past */
611 ehc
->last_reset
= jiffies
- 60 * HZ
;
614 ap
->pflags
|= ATA_PFLAG_EH_IN_PROGRESS
;
615 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
616 ap
->excl_link
= NULL
; /* don't maintain exclusion over EH */
618 spin_unlock_irqrestore(ap
->lock
, flags
);
620 /* invoke EH, skip if unloading or suspended */
621 if (!(ap
->pflags
& (ATA_PFLAG_UNLOADING
| ATA_PFLAG_SUSPENDED
)))
622 ap
->ops
->error_handler(ap
);
626 /* process port suspend request */
627 ata_eh_handle_port_suspend(ap
);
629 /* Exception might have happend after ->error_handler
630 * recovered the port but before this point. Repeat
633 spin_lock_irqsave(ap
->lock
, flags
);
635 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
) {
636 if (--ap
->eh_tries
) {
637 spin_unlock_irqrestore(ap
->lock
, flags
);
640 ata_port_printk(ap
, KERN_ERR
, "EH pending after %d "
641 "tries, giving up\n", ATA_EH_MAX_TRIES
);
642 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
645 /* this run is complete, make sure EH info is clear */
646 __ata_port_for_each_link(link
, ap
)
647 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
649 /* Clear host_eh_scheduled while holding ap->lock such
650 * that if exception occurs after this point but
651 * before EH completion, SCSI midlayer will
654 host
->host_eh_scheduled
= 0;
656 spin_unlock_irqrestore(ap
->lock
, flags
);
658 WARN_ON(ata_qc_from_tag(ap
, ap
->link
.active_tag
) == NULL
);
659 ap
->ops
->eng_timeout(ap
);
662 /* finish or retry handled scmd's and clean up */
663 WARN_ON(host
->host_failed
|| !list_empty(&host
->eh_cmd_q
));
665 scsi_eh_flush_done_q(&ap
->eh_done_q
);
668 spin_lock_irqsave(ap
->lock
, flags
);
670 if (ap
->pflags
& ATA_PFLAG_LOADING
)
671 ap
->pflags
&= ~ATA_PFLAG_LOADING
;
672 else if (ap
->pflags
& ATA_PFLAG_SCSI_HOTPLUG
)
673 queue_delayed_work(ata_aux_wq
, &ap
->hotplug_task
, 0);
675 if (ap
->pflags
& ATA_PFLAG_RECOVERED
)
676 ata_port_printk(ap
, KERN_INFO
, "EH complete\n");
678 ap
->pflags
&= ~(ATA_PFLAG_SCSI_HOTPLUG
| ATA_PFLAG_RECOVERED
);
680 /* tell wait_eh that we're done */
681 ap
->pflags
&= ~ATA_PFLAG_EH_IN_PROGRESS
;
682 wake_up_all(&ap
->eh_wait_q
);
684 spin_unlock_irqrestore(ap
->lock
, flags
);
690 * ata_port_wait_eh - Wait for the currently pending EH to complete
691 * @ap: Port to wait EH for
693 * Wait until the currently pending EH is complete.
696 * Kernel thread context (may sleep).
698 void ata_port_wait_eh(struct ata_port
*ap
)
704 spin_lock_irqsave(ap
->lock
, flags
);
706 while (ap
->pflags
& (ATA_PFLAG_EH_PENDING
| ATA_PFLAG_EH_IN_PROGRESS
)) {
707 prepare_to_wait(&ap
->eh_wait_q
, &wait
, TASK_UNINTERRUPTIBLE
);
708 spin_unlock_irqrestore(ap
->lock
, flags
);
710 spin_lock_irqsave(ap
->lock
, flags
);
712 finish_wait(&ap
->eh_wait_q
, &wait
);
714 spin_unlock_irqrestore(ap
->lock
, flags
);
716 /* make sure SCSI EH is complete */
717 if (scsi_host_in_recovery(ap
->scsi_host
)) {
723 static int ata_eh_nr_in_flight(struct ata_port
*ap
)
728 /* count only non-internal commands */
729 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++)
730 if (ata_qc_from_tag(ap
, tag
))
736 void ata_eh_fastdrain_timerfn(unsigned long arg
)
738 struct ata_port
*ap
= (void *)arg
;
742 spin_lock_irqsave(ap
->lock
, flags
);
744 cnt
= ata_eh_nr_in_flight(ap
);
750 if (cnt
== ap
->fastdrain_cnt
) {
753 /* No progress during the last interval, tag all
754 * in-flight qcs as timed out and freeze the port.
756 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++) {
757 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
759 qc
->err_mask
|= AC_ERR_TIMEOUT
;
764 /* some qcs have finished, give it another chance */
765 ap
->fastdrain_cnt
= cnt
;
766 ap
->fastdrain_timer
.expires
=
767 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
768 add_timer(&ap
->fastdrain_timer
);
772 spin_unlock_irqrestore(ap
->lock
, flags
);
776 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
777 * @ap: target ATA port
778 * @fastdrain: activate fast drain
780 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
781 * is non-zero and EH wasn't pending before. Fast drain ensures
782 * that EH kicks in in timely manner.
785 * spin_lock_irqsave(host lock)
787 static void ata_eh_set_pending(struct ata_port
*ap
, int fastdrain
)
791 /* already scheduled? */
792 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
)
795 ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
800 /* do we have in-flight qcs? */
801 cnt
= ata_eh_nr_in_flight(ap
);
805 /* activate fast drain */
806 ap
->fastdrain_cnt
= cnt
;
807 ap
->fastdrain_timer
.expires
=
808 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
809 add_timer(&ap
->fastdrain_timer
);
813 * ata_qc_schedule_eh - schedule qc for error handling
814 * @qc: command to schedule error handling for
816 * Schedule error handling for @qc. EH will kick in as soon as
817 * other commands are drained.
820 * spin_lock_irqsave(host lock)
822 void ata_qc_schedule_eh(struct ata_queued_cmd
*qc
)
824 struct ata_port
*ap
= qc
->ap
;
826 WARN_ON(!ap
->ops
->error_handler
);
828 qc
->flags
|= ATA_QCFLAG_FAILED
;
829 ata_eh_set_pending(ap
, 1);
831 /* The following will fail if timeout has already expired.
832 * ata_scsi_error() takes care of such scmds on EH entry.
833 * Note that ATA_QCFLAG_FAILED is unconditionally set after
834 * this function completes.
836 scsi_req_abort_cmd(qc
->scsicmd
);
840 * ata_port_schedule_eh - schedule error handling without a qc
841 * @ap: ATA port to schedule EH for
843 * Schedule error handling for @ap. EH will kick in as soon as
844 * all commands are drained.
847 * spin_lock_irqsave(host lock)
849 void ata_port_schedule_eh(struct ata_port
*ap
)
851 WARN_ON(!ap
->ops
->error_handler
);
853 if (ap
->pflags
& ATA_PFLAG_INITIALIZING
)
856 ata_eh_set_pending(ap
, 1);
857 scsi_schedule_eh(ap
->scsi_host
);
859 DPRINTK("port EH scheduled\n");
862 static int ata_do_link_abort(struct ata_port
*ap
, struct ata_link
*link
)
864 int tag
, nr_aborted
= 0;
866 WARN_ON(!ap
->ops
->error_handler
);
868 /* we're gonna abort all commands, no need for fast drain */
869 ata_eh_set_pending(ap
, 0);
871 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
872 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
874 if (qc
&& (!link
|| qc
->dev
->link
== link
)) {
875 qc
->flags
|= ATA_QCFLAG_FAILED
;
882 ata_port_schedule_eh(ap
);
888 * ata_link_abort - abort all qc's on the link
889 * @link: ATA link to abort qc's for
891 * Abort all active qc's active on @link and schedule EH.
894 * spin_lock_irqsave(host lock)
897 * Number of aborted qc's.
899 int ata_link_abort(struct ata_link
*link
)
901 return ata_do_link_abort(link
->ap
, link
);
905 * ata_port_abort - abort all qc's on the port
906 * @ap: ATA port to abort qc's for
908 * Abort all active qc's of @ap and schedule EH.
911 * spin_lock_irqsave(host_set lock)
914 * Number of aborted qc's.
916 int ata_port_abort(struct ata_port
*ap
)
918 return ata_do_link_abort(ap
, NULL
);
922 * __ata_port_freeze - freeze port
923 * @ap: ATA port to freeze
925 * This function is called when HSM violation or some other
926 * condition disrupts normal operation of the port. Frozen port
927 * is not allowed to perform any operation until the port is
928 * thawed, which usually follows a successful reset.
930 * ap->ops->freeze() callback can be used for freezing the port
931 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
932 * port cannot be frozen hardware-wise, the interrupt handler
933 * must ack and clear interrupts unconditionally while the port
937 * spin_lock_irqsave(host lock)
939 static void __ata_port_freeze(struct ata_port
*ap
)
941 WARN_ON(!ap
->ops
->error_handler
);
946 ap
->pflags
|= ATA_PFLAG_FROZEN
;
948 DPRINTK("ata%u port frozen\n", ap
->print_id
);
952 * ata_port_freeze - abort & freeze port
953 * @ap: ATA port to freeze
955 * Abort and freeze @ap.
958 * spin_lock_irqsave(host lock)
961 * Number of aborted commands.
963 int ata_port_freeze(struct ata_port
*ap
)
967 WARN_ON(!ap
->ops
->error_handler
);
969 nr_aborted
= ata_port_abort(ap
);
970 __ata_port_freeze(ap
);
976 * sata_async_notification - SATA async notification handler
977 * @ap: ATA port where async notification is received
979 * Handler to be called when async notification via SDB FIS is
980 * received. This function schedules EH if necessary.
983 * spin_lock_irqsave(host lock)
986 * 1 if EH is scheduled, 0 otherwise.
988 int sata_async_notification(struct ata_port
*ap
)
993 if (!(ap
->flags
& ATA_FLAG_AN
))
996 rc
= sata_scr_read(&ap
->link
, SCR_NOTIFICATION
, &sntf
);
998 sata_scr_write(&ap
->link
, SCR_NOTIFICATION
, sntf
);
1000 if (!sata_pmp_attached(ap
) || rc
) {
1001 /* PMP is not attached or SNTF is not available */
1002 if (!sata_pmp_attached(ap
)) {
1003 /* PMP is not attached. Check whether ATAPI
1004 * AN is configured. If so, notify media
1007 struct ata_device
*dev
= ap
->link
.device
;
1009 if ((dev
->class == ATA_DEV_ATAPI
) &&
1010 (dev
->flags
& ATA_DFLAG_AN
))
1011 ata_scsi_media_change_notify(dev
);
1014 /* PMP is attached but SNTF is not available.
1015 * ATAPI async media change notification is
1016 * not used. The PMP must be reporting PHY
1017 * status change, schedule EH.
1019 ata_port_schedule_eh(ap
);
1023 /* PMP is attached and SNTF is available */
1024 struct ata_link
*link
;
1026 /* check and notify ATAPI AN */
1027 ata_port_for_each_link(link
, ap
) {
1028 if (!(sntf
& (1 << link
->pmp
)))
1031 if ((link
->device
->class == ATA_DEV_ATAPI
) &&
1032 (link
->device
->flags
& ATA_DFLAG_AN
))
1033 ata_scsi_media_change_notify(link
->device
);
1036 /* If PMP is reporting that PHY status of some
1037 * downstream ports has changed, schedule EH.
1039 if (sntf
& (1 << SATA_PMP_CTRL_PORT
)) {
1040 ata_port_schedule_eh(ap
);
1049 * ata_eh_freeze_port - EH helper to freeze port
1050 * @ap: ATA port to freeze
1057 void ata_eh_freeze_port(struct ata_port
*ap
)
1059 unsigned long flags
;
1061 if (!ap
->ops
->error_handler
)
1064 spin_lock_irqsave(ap
->lock
, flags
);
1065 __ata_port_freeze(ap
);
1066 spin_unlock_irqrestore(ap
->lock
, flags
);
1070 * ata_port_thaw_port - EH helper to thaw port
1071 * @ap: ATA port to thaw
1073 * Thaw frozen port @ap.
1078 void ata_eh_thaw_port(struct ata_port
*ap
)
1080 unsigned long flags
;
1082 if (!ap
->ops
->error_handler
)
1085 spin_lock_irqsave(ap
->lock
, flags
);
1087 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
1092 spin_unlock_irqrestore(ap
->lock
, flags
);
1094 DPRINTK("ata%u port thawed\n", ap
->print_id
);
1097 static void ata_eh_scsidone(struct scsi_cmnd
*scmd
)
1102 static void __ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1104 struct ata_port
*ap
= qc
->ap
;
1105 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1106 unsigned long flags
;
1108 spin_lock_irqsave(ap
->lock
, flags
);
1109 qc
->scsidone
= ata_eh_scsidone
;
1110 __ata_qc_complete(qc
);
1111 WARN_ON(ata_tag_valid(qc
->tag
));
1112 spin_unlock_irqrestore(ap
->lock
, flags
);
1114 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
1118 * ata_eh_qc_complete - Complete an active ATA command from EH
1119 * @qc: Command to complete
1121 * Indicate to the mid and upper layers that an ATA command has
1122 * completed. To be used from EH.
1124 void ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1126 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1127 scmd
->retries
= scmd
->allowed
;
1128 __ata_eh_qc_complete(qc
);
1132 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1133 * @qc: Command to retry
1135 * Indicate to the mid and upper layers that an ATA command
1136 * should be retried. To be used from EH.
1138 * SCSI midlayer limits the number of retries to scmd->allowed.
1139 * scmd->retries is decremented for commands which get retried
1140 * due to unrelated failures (qc->err_mask is zero).
1142 void ata_eh_qc_retry(struct ata_queued_cmd
*qc
)
1144 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1145 if (!qc
->err_mask
&& scmd
->retries
)
1147 __ata_eh_qc_complete(qc
);
1151 * ata_eh_detach_dev - detach ATA device
1152 * @dev: ATA device to detach
1159 void ata_eh_detach_dev(struct ata_device
*dev
)
1161 struct ata_link
*link
= dev
->link
;
1162 struct ata_port
*ap
= link
->ap
;
1163 unsigned long flags
;
1165 ata_dev_disable(dev
);
1167 spin_lock_irqsave(ap
->lock
, flags
);
1169 dev
->flags
&= ~ATA_DFLAG_DETACH
;
1171 if (ata_scsi_offline_dev(dev
)) {
1172 dev
->flags
|= ATA_DFLAG_DETACHED
;
1173 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
1176 /* clear per-dev EH actions */
1177 ata_eh_clear_action(link
, dev
, &link
->eh_info
, ATA_EH_PERDEV_MASK
);
1178 ata_eh_clear_action(link
, dev
, &link
->eh_context
.i
, ATA_EH_PERDEV_MASK
);
1180 spin_unlock_irqrestore(ap
->lock
, flags
);
1184 * ata_eh_about_to_do - about to perform eh_action
1185 * @link: target ATA link
1186 * @dev: target ATA dev for per-dev action (can be NULL)
1187 * @action: action about to be performed
1189 * Called just before performing EH actions to clear related bits
1190 * in @link->eh_info such that eh actions are not unnecessarily
1196 void ata_eh_about_to_do(struct ata_link
*link
, struct ata_device
*dev
,
1197 unsigned int action
)
1199 struct ata_port
*ap
= link
->ap
;
1200 struct ata_eh_info
*ehi
= &link
->eh_info
;
1201 struct ata_eh_context
*ehc
= &link
->eh_context
;
1202 unsigned long flags
;
1204 spin_lock_irqsave(ap
->lock
, flags
);
1206 ata_eh_clear_action(link
, dev
, ehi
, action
);
1208 if (!(ehc
->i
.flags
& ATA_EHI_QUIET
))
1209 ap
->pflags
|= ATA_PFLAG_RECOVERED
;
1211 spin_unlock_irqrestore(ap
->lock
, flags
);
1215 * ata_eh_done - EH action complete
1216 * @ap: target ATA port
1217 * @dev: target ATA dev for per-dev action (can be NULL)
1218 * @action: action just completed
1220 * Called right after performing EH actions to clear related bits
1221 * in @link->eh_context.
1226 void ata_eh_done(struct ata_link
*link
, struct ata_device
*dev
,
1227 unsigned int action
)
1229 struct ata_eh_context
*ehc
= &link
->eh_context
;
1231 ata_eh_clear_action(link
, dev
, &ehc
->i
, action
);
1235 * ata_err_string - convert err_mask to descriptive string
1236 * @err_mask: error mask to convert to string
1238 * Convert @err_mask to descriptive string. Errors are
1239 * prioritized according to severity and only the most severe
1240 * error is reported.
1246 * Descriptive string for @err_mask
1248 static const char *ata_err_string(unsigned int err_mask
)
1250 if (err_mask
& AC_ERR_HOST_BUS
)
1251 return "host bus error";
1252 if (err_mask
& AC_ERR_ATA_BUS
)
1253 return "ATA bus error";
1254 if (err_mask
& AC_ERR_TIMEOUT
)
1256 if (err_mask
& AC_ERR_HSM
)
1257 return "HSM violation";
1258 if (err_mask
& AC_ERR_SYSTEM
)
1259 return "internal error";
1260 if (err_mask
& AC_ERR_MEDIA
)
1261 return "media error";
1262 if (err_mask
& AC_ERR_INVALID
)
1263 return "invalid argument";
1264 if (err_mask
& AC_ERR_DEV
)
1265 return "device error";
1266 return "unknown error";
1270 * ata_read_log_page - read a specific log page
1271 * @dev: target device
1272 * @page: page to read
1273 * @buf: buffer to store read page
1274 * @sectors: number of sectors to read
1276 * Read log page using READ_LOG_EXT command.
1279 * Kernel thread context (may sleep).
1282 * 0 on success, AC_ERR_* mask otherwise.
1284 static unsigned int ata_read_log_page(struct ata_device
*dev
,
1285 u8 page
, void *buf
, unsigned int sectors
)
1287 struct ata_taskfile tf
;
1288 unsigned int err_mask
;
1290 DPRINTK("read log page - page %d\n", page
);
1292 ata_tf_init(dev
, &tf
);
1293 tf
.command
= ATA_CMD_READ_LOG_EXT
;
1296 tf
.hob_nsect
= sectors
>> 8;
1297 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA48
| ATA_TFLAG_DEVICE
;
1298 tf
.protocol
= ATA_PROT_PIO
;
1300 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1301 buf
, sectors
* ATA_SECT_SIZE
, 0);
1303 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
1308 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1309 * @dev: Device to read log page 10h from
1310 * @tag: Resulting tag of the failed command
1311 * @tf: Resulting taskfile registers of the failed command
1313 * Read log page 10h to obtain NCQ error details and clear error
1317 * Kernel thread context (may sleep).
1320 * 0 on success, -errno otherwise.
1322 static int ata_eh_read_log_10h(struct ata_device
*dev
,
1323 int *tag
, struct ata_taskfile
*tf
)
1325 u8
*buf
= dev
->link
->ap
->sector_buf
;
1326 unsigned int err_mask
;
1330 err_mask
= ata_read_log_page(dev
, ATA_LOG_SATA_NCQ
, buf
, 1);
1335 for (i
= 0; i
< ATA_SECT_SIZE
; i
++)
1338 ata_dev_printk(dev
, KERN_WARNING
,
1339 "invalid checksum 0x%x on log page 10h\n", csum
);
1344 *tag
= buf
[0] & 0x1f;
1346 tf
->command
= buf
[2];
1347 tf
->feature
= buf
[3];
1351 tf
->device
= buf
[7];
1352 tf
->hob_lbal
= buf
[8];
1353 tf
->hob_lbam
= buf
[9];
1354 tf
->hob_lbah
= buf
[10];
1355 tf
->nsect
= buf
[12];
1356 tf
->hob_nsect
= buf
[13];
1362 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1363 * @dev: target ATAPI device
1364 * @r_sense_key: out parameter for sense_key
1366 * Perform ATAPI TEST_UNIT_READY.
1369 * EH context (may sleep).
1372 * 0 on success, AC_ERR_* mask on failure.
1374 static unsigned int atapi_eh_tur(struct ata_device
*dev
, u8
*r_sense_key
)
1376 u8 cdb
[ATAPI_CDB_LEN
] = { TEST_UNIT_READY
, 0, 0, 0, 0, 0 };
1377 struct ata_taskfile tf
;
1378 unsigned int err_mask
;
1380 ata_tf_init(dev
, &tf
);
1382 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1383 tf
.command
= ATA_CMD_PACKET
;
1384 tf
.protocol
= ATAPI_PROT_NODATA
;
1386 err_mask
= ata_exec_internal(dev
, &tf
, cdb
, DMA_NONE
, NULL
, 0, 0);
1387 if (err_mask
== AC_ERR_DEV
)
1388 *r_sense_key
= tf
.feature
>> 4;
1393 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1394 * @dev: device to perform REQUEST_SENSE to
1395 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1396 * @dfl_sense_key: default sense key to use
1398 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1399 * SENSE. This function is EH helper.
1402 * Kernel thread context (may sleep).
1405 * 0 on success, AC_ERR_* mask on failure
1407 static unsigned int atapi_eh_request_sense(struct ata_device
*dev
,
1408 u8
*sense_buf
, u8 dfl_sense_key
)
1410 u8 cdb
[ATAPI_CDB_LEN
] =
1411 { REQUEST_SENSE
, 0, 0, 0, SCSI_SENSE_BUFFERSIZE
, 0 };
1412 struct ata_port
*ap
= dev
->link
->ap
;
1413 struct ata_taskfile tf
;
1415 DPRINTK("ATAPI request sense\n");
1417 /* FIXME: is this needed? */
1418 memset(sense_buf
, 0, SCSI_SENSE_BUFFERSIZE
);
1420 /* initialize sense_buf with the error register,
1421 * for the case where they are -not- overwritten
1423 sense_buf
[0] = 0x70;
1424 sense_buf
[2] = dfl_sense_key
;
1426 /* some devices time out if garbage left in tf */
1427 ata_tf_init(dev
, &tf
);
1429 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1430 tf
.command
= ATA_CMD_PACKET
;
1432 /* is it pointless to prefer PIO for "safety reasons"? */
1433 if (ap
->flags
& ATA_FLAG_PIO_DMA
) {
1434 tf
.protocol
= ATAPI_PROT_DMA
;
1435 tf
.feature
|= ATAPI_PKT_DMA
;
1437 tf
.protocol
= ATAPI_PROT_PIO
;
1438 tf
.lbam
= SCSI_SENSE_BUFFERSIZE
;
1442 return ata_exec_internal(dev
, &tf
, cdb
, DMA_FROM_DEVICE
,
1443 sense_buf
, SCSI_SENSE_BUFFERSIZE
, 0);
1447 * ata_eh_analyze_serror - analyze SError for a failed port
1448 * @link: ATA link to analyze SError for
1450 * Analyze SError if available and further determine cause of
1456 static void ata_eh_analyze_serror(struct ata_link
*link
)
1458 struct ata_eh_context
*ehc
= &link
->eh_context
;
1459 u32 serror
= ehc
->i
.serror
;
1460 unsigned int err_mask
= 0, action
= 0;
1463 if (serror
& (SERR_PERSISTENT
| SERR_DATA
)) {
1464 err_mask
|= AC_ERR_ATA_BUS
;
1465 action
|= ATA_EH_RESET
;
1467 if (serror
& SERR_PROTOCOL
) {
1468 err_mask
|= AC_ERR_HSM
;
1469 action
|= ATA_EH_RESET
;
1471 if (serror
& SERR_INTERNAL
) {
1472 err_mask
|= AC_ERR_SYSTEM
;
1473 action
|= ATA_EH_RESET
;
1476 /* Determine whether a hotplug event has occurred. Both
1477 * SError.N/X are considered hotplug events for enabled or
1478 * host links. For disabled PMP links, only N bit is
1479 * considered as X bit is left at 1 for link plugging.
1483 if (!(link
->flags
& ATA_LFLAG_DISABLED
) || ata_is_host_link(link
))
1484 hotplug_mask
= SERR_PHYRDY_CHG
| SERR_DEV_XCHG
;
1486 hotplug_mask
= SERR_PHYRDY_CHG
;
1488 if (serror
& hotplug_mask
)
1489 ata_ehi_hotplugged(&ehc
->i
);
1491 ehc
->i
.err_mask
|= err_mask
;
1492 ehc
->i
.action
|= action
;
1496 * ata_eh_analyze_ncq_error - analyze NCQ error
1497 * @link: ATA link to analyze NCQ error for
1499 * Read log page 10h, determine the offending qc and acquire
1500 * error status TF. For NCQ device errors, all LLDDs have to do
1501 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1505 * Kernel thread context (may sleep).
1507 void ata_eh_analyze_ncq_error(struct ata_link
*link
)
1509 struct ata_port
*ap
= link
->ap
;
1510 struct ata_eh_context
*ehc
= &link
->eh_context
;
1511 struct ata_device
*dev
= link
->device
;
1512 struct ata_queued_cmd
*qc
;
1513 struct ata_taskfile tf
;
1516 /* if frozen, we can't do much */
1517 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1520 /* is it NCQ device error? */
1521 if (!link
->sactive
|| !(ehc
->i
.err_mask
& AC_ERR_DEV
))
1524 /* has LLDD analyzed already? */
1525 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1526 qc
= __ata_qc_from_tag(ap
, tag
);
1528 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1535 /* okay, this error is ours */
1536 rc
= ata_eh_read_log_10h(dev
, &tag
, &tf
);
1538 ata_link_printk(link
, KERN_ERR
, "failed to read log page 10h "
1539 "(errno=%d)\n", rc
);
1543 if (!(link
->sactive
& (1 << tag
))) {
1544 ata_link_printk(link
, KERN_ERR
, "log page 10h reported "
1545 "inactive tag %d\n", tag
);
1549 /* we've got the perpetrator, condemn it */
1550 qc
= __ata_qc_from_tag(ap
, tag
);
1551 memcpy(&qc
->result_tf
, &tf
, sizeof(tf
));
1552 qc
->result_tf
.flags
= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA
| ATA_TFLAG_LBA48
;
1553 qc
->err_mask
|= AC_ERR_DEV
| AC_ERR_NCQ
;
1554 ehc
->i
.err_mask
&= ~AC_ERR_DEV
;
1558 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1559 * @qc: qc to analyze
1560 * @tf: Taskfile registers to analyze
1562 * Analyze taskfile of @qc and further determine cause of
1563 * failure. This function also requests ATAPI sense data if
1567 * Kernel thread context (may sleep).
1570 * Determined recovery action
1572 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd
*qc
,
1573 const struct ata_taskfile
*tf
)
1575 unsigned int tmp
, action
= 0;
1576 u8 stat
= tf
->command
, err
= tf
->feature
;
1578 if ((stat
& (ATA_BUSY
| ATA_DRQ
| ATA_DRDY
)) != ATA_DRDY
) {
1579 qc
->err_mask
|= AC_ERR_HSM
;
1580 return ATA_EH_RESET
;
1583 if (stat
& (ATA_ERR
| ATA_DF
))
1584 qc
->err_mask
|= AC_ERR_DEV
;
1588 switch (qc
->dev
->class) {
1591 qc
->err_mask
|= AC_ERR_ATA_BUS
;
1593 qc
->err_mask
|= AC_ERR_MEDIA
;
1595 qc
->err_mask
|= AC_ERR_INVALID
;
1599 if (!(qc
->ap
->pflags
& ATA_PFLAG_FROZEN
)) {
1600 tmp
= atapi_eh_request_sense(qc
->dev
,
1601 qc
->scsicmd
->sense_buffer
,
1602 qc
->result_tf
.feature
>> 4);
1604 /* ATA_QCFLAG_SENSE_VALID is used to
1605 * tell atapi_qc_complete() that sense
1606 * data is already valid.
1608 * TODO: interpret sense data and set
1609 * appropriate err_mask.
1611 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1613 qc
->err_mask
|= tmp
;
1617 if (qc
->err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
| AC_ERR_ATA_BUS
))
1618 action
|= ATA_EH_RESET
;
1623 static int ata_eh_categorize_error(unsigned int eflags
, unsigned int err_mask
,
1628 if (!(eflags
& ATA_EFLAG_DUBIOUS_XFER
))
1632 base
= ATA_ECAT_DUBIOUS_NONE
;
1634 if (err_mask
& AC_ERR_ATA_BUS
)
1635 return base
+ ATA_ECAT_ATA_BUS
;
1637 if (err_mask
& AC_ERR_TIMEOUT
)
1638 return base
+ ATA_ECAT_TOUT_HSM
;
1640 if (eflags
& ATA_EFLAG_IS_IO
) {
1641 if (err_mask
& AC_ERR_HSM
)
1642 return base
+ ATA_ECAT_TOUT_HSM
;
1644 (AC_ERR_DEV
|AC_ERR_MEDIA
|AC_ERR_INVALID
)) == AC_ERR_DEV
)
1645 return base
+ ATA_ECAT_UNK_DEV
;
1651 struct speed_down_verdict_arg
{
1654 int nr_errors
[ATA_ECAT_NR
];
1657 static int speed_down_verdict_cb(struct ata_ering_entry
*ent
, void *void_arg
)
1659 struct speed_down_verdict_arg
*arg
= void_arg
;
1662 if (ent
->timestamp
< arg
->since
)
1665 cat
= ata_eh_categorize_error(ent
->eflags
, ent
->err_mask
,
1667 arg
->nr_errors
[cat
]++;
1673 * ata_eh_speed_down_verdict - Determine speed down verdict
1674 * @dev: Device of interest
1676 * This function examines error ring of @dev and determines
1677 * whether NCQ needs to be turned off, transfer speed should be
1678 * stepped down, or falling back to PIO is necessary.
1680 * ECAT_ATA_BUS : ATA_BUS error for any command
1682 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1685 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1687 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1688 * data transfer hasn't been verified.
1692 * NCQ_OFF : Turn off NCQ.
1694 * SPEED_DOWN : Speed down transfer speed but don't fall back
1697 * FALLBACK_TO_PIO : Fall back to PIO.
1699 * Even if multiple verdicts are returned, only one action is
1700 * taken per error. An action triggered by non-DUBIOUS errors
1701 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1702 * This is to expedite speed down decisions right after device is
1703 * initially configured.
1705 * The followings are speed down rules. #1 and #2 deal with
1708 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1709 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1711 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1712 * occurred during last 5 mins, NCQ_OFF.
1714 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1715 * ocurred during last 5 mins, FALLBACK_TO_PIO
1717 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1718 * during last 10 mins, NCQ_OFF.
1720 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1721 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1724 * Inherited from caller.
1727 * OR of ATA_EH_SPDN_* flags.
1729 static unsigned int ata_eh_speed_down_verdict(struct ata_device
*dev
)
1731 const u64 j5mins
= 5LLU * 60 * HZ
, j10mins
= 10LLU * 60 * HZ
;
1732 u64 j64
= get_jiffies_64();
1733 struct speed_down_verdict_arg arg
;
1734 unsigned int verdict
= 0;
1736 /* scan past 5 mins of error history */
1737 memset(&arg
, 0, sizeof(arg
));
1738 arg
.since
= j64
- min(j64
, j5mins
);
1739 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1741 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_ATA_BUS
] +
1742 arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] > 1)
1743 verdict
|= ATA_EH_SPDN_SPEED_DOWN
|
1744 ATA_EH_SPDN_FALLBACK_TO_PIO
| ATA_EH_SPDN_KEEP_ERRORS
;
1746 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] +
1747 arg
.nr_errors
[ATA_ECAT_DUBIOUS_UNK_DEV
] > 1)
1748 verdict
|= ATA_EH_SPDN_NCQ_OFF
| ATA_EH_SPDN_KEEP_ERRORS
;
1750 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1751 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1752 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1753 verdict
|= ATA_EH_SPDN_FALLBACK_TO_PIO
;
1755 /* scan past 10 mins of error history */
1756 memset(&arg
, 0, sizeof(arg
));
1757 arg
.since
= j64
- min(j64
, j10mins
);
1758 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1760 if (arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1761 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 3)
1762 verdict
|= ATA_EH_SPDN_NCQ_OFF
;
1764 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1765 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] > 3 ||
1766 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1767 verdict
|= ATA_EH_SPDN_SPEED_DOWN
;
1773 * ata_eh_speed_down - record error and speed down if necessary
1774 * @dev: Failed device
1775 * @eflags: mask of ATA_EFLAG_* flags
1776 * @err_mask: err_mask of the error
1778 * Record error and examine error history to determine whether
1779 * adjusting transmission speed is necessary. It also sets
1780 * transmission limits appropriately if such adjustment is
1784 * Kernel thread context (may sleep).
1787 * Determined recovery action.
1789 static unsigned int ata_eh_speed_down(struct ata_device
*dev
,
1790 unsigned int eflags
, unsigned int err_mask
)
1792 struct ata_link
*link
= ata_dev_phys_link(dev
);
1794 unsigned int verdict
;
1795 unsigned int action
= 0;
1797 /* don't bother if Cat-0 error */
1798 if (ata_eh_categorize_error(eflags
, err_mask
, &xfer_ok
) == 0)
1801 /* record error and determine whether speed down is necessary */
1802 ata_ering_record(&dev
->ering
, eflags
, err_mask
);
1803 verdict
= ata_eh_speed_down_verdict(dev
);
1806 if ((verdict
& ATA_EH_SPDN_NCQ_OFF
) &&
1807 (dev
->flags
& (ATA_DFLAG_PIO
| ATA_DFLAG_NCQ
|
1808 ATA_DFLAG_NCQ_OFF
)) == ATA_DFLAG_NCQ
) {
1809 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
1810 ata_dev_printk(dev
, KERN_WARNING
,
1811 "NCQ disabled due to excessive errors\n");
1816 if (verdict
& ATA_EH_SPDN_SPEED_DOWN
) {
1817 /* speed down SATA link speed if possible */
1818 if (sata_down_spd_limit(link
) == 0) {
1819 action
|= ATA_EH_RESET
;
1823 /* lower transfer mode */
1824 if (dev
->spdn_cnt
< 2) {
1825 static const int dma_dnxfer_sel
[] =
1826 { ATA_DNXFER_DMA
, ATA_DNXFER_40C
};
1827 static const int pio_dnxfer_sel
[] =
1828 { ATA_DNXFER_PIO
, ATA_DNXFER_FORCE_PIO0
};
1831 if (dev
->xfer_shift
!= ATA_SHIFT_PIO
)
1832 sel
= dma_dnxfer_sel
[dev
->spdn_cnt
];
1834 sel
= pio_dnxfer_sel
[dev
->spdn_cnt
];
1838 if (ata_down_xfermask_limit(dev
, sel
) == 0) {
1839 action
|= ATA_EH_RESET
;
1845 /* Fall back to PIO? Slowing down to PIO is meaningless for
1846 * SATA ATA devices. Consider it only for PATA and SATAPI.
1848 if ((verdict
& ATA_EH_SPDN_FALLBACK_TO_PIO
) && (dev
->spdn_cnt
>= 2) &&
1849 (link
->ap
->cbl
!= ATA_CBL_SATA
|| dev
->class == ATA_DEV_ATAPI
) &&
1850 (dev
->xfer_shift
!= ATA_SHIFT_PIO
)) {
1851 if (ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO
) == 0) {
1853 action
|= ATA_EH_RESET
;
1860 /* device has been slowed down, blow error history */
1861 if (!(verdict
& ATA_EH_SPDN_KEEP_ERRORS
))
1862 ata_ering_clear(&dev
->ering
);
1867 * ata_eh_link_autopsy - analyze error and determine recovery action
1868 * @link: host link to perform autopsy on
1870 * Analyze why @link failed and determine which recovery actions
1871 * are needed. This function also sets more detailed AC_ERR_*
1872 * values and fills sense data for ATAPI CHECK SENSE.
1875 * Kernel thread context (may sleep).
1877 static void ata_eh_link_autopsy(struct ata_link
*link
)
1879 struct ata_port
*ap
= link
->ap
;
1880 struct ata_eh_context
*ehc
= &link
->eh_context
;
1881 struct ata_device
*dev
;
1882 unsigned int all_err_mask
= 0, eflags
= 0;
1889 if (ehc
->i
.flags
& ATA_EHI_NO_AUTOPSY
)
1892 /* obtain and analyze SError */
1893 rc
= sata_scr_read(link
, SCR_ERROR
, &serror
);
1895 ehc
->i
.serror
|= serror
;
1896 ata_eh_analyze_serror(link
);
1897 } else if (rc
!= -EOPNOTSUPP
) {
1898 /* SError read failed, force reset and probing */
1899 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
1900 ehc
->i
.action
|= ATA_EH_RESET
;
1901 ehc
->i
.err_mask
|= AC_ERR_OTHER
;
1904 /* analyze NCQ failure */
1905 ata_eh_analyze_ncq_error(link
);
1907 /* any real error trumps AC_ERR_OTHER */
1908 if (ehc
->i
.err_mask
& ~AC_ERR_OTHER
)
1909 ehc
->i
.err_mask
&= ~AC_ERR_OTHER
;
1911 all_err_mask
|= ehc
->i
.err_mask
;
1913 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1914 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
1916 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
1917 ata_dev_phys_link(qc
->dev
) != link
)
1920 /* inherit upper level err_mask */
1921 qc
->err_mask
|= ehc
->i
.err_mask
;
1924 ehc
->i
.action
|= ata_eh_analyze_tf(qc
, &qc
->result_tf
);
1926 /* DEV errors are probably spurious in case of ATA_BUS error */
1927 if (qc
->err_mask
& AC_ERR_ATA_BUS
)
1928 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_MEDIA
|
1931 /* any real error trumps unknown error */
1932 if (qc
->err_mask
& ~AC_ERR_OTHER
)
1933 qc
->err_mask
&= ~AC_ERR_OTHER
;
1935 /* SENSE_VALID trumps dev/unknown error and revalidation */
1936 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
1937 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_OTHER
);
1939 /* determine whether the command is worth retrying */
1940 if (!(qc
->err_mask
& AC_ERR_INVALID
) &&
1941 ((qc
->flags
& ATA_QCFLAG_IO
) || qc
->err_mask
!= AC_ERR_DEV
))
1942 qc
->flags
|= ATA_QCFLAG_RETRY
;
1944 /* accumulate error info */
1945 ehc
->i
.dev
= qc
->dev
;
1946 all_err_mask
|= qc
->err_mask
;
1947 if (qc
->flags
& ATA_QCFLAG_IO
)
1948 eflags
|= ATA_EFLAG_IS_IO
;
1951 /* enforce default EH actions */
1952 if (ap
->pflags
& ATA_PFLAG_FROZEN
||
1953 all_err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
))
1954 ehc
->i
.action
|= ATA_EH_RESET
;
1955 else if (((eflags
& ATA_EFLAG_IS_IO
) && all_err_mask
) ||
1956 (!(eflags
& ATA_EFLAG_IS_IO
) && (all_err_mask
& ~AC_ERR_DEV
)))
1957 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
1959 /* If we have offending qcs and the associated failed device,
1960 * perform per-dev EH action only on the offending device.
1963 ehc
->i
.dev_action
[ehc
->i
.dev
->devno
] |=
1964 ehc
->i
.action
& ATA_EH_PERDEV_MASK
;
1965 ehc
->i
.action
&= ~ATA_EH_PERDEV_MASK
;
1968 /* propagate timeout to host link */
1969 if ((all_err_mask
& AC_ERR_TIMEOUT
) && !ata_is_host_link(link
))
1970 ap
->link
.eh_context
.i
.err_mask
|= AC_ERR_TIMEOUT
;
1972 /* record error and consider speeding down */
1974 if (!dev
&& ((ata_link_max_devices(link
) == 1 &&
1975 ata_dev_enabled(link
->device
))))
1979 if (dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)
1980 eflags
|= ATA_EFLAG_DUBIOUS_XFER
;
1981 ehc
->i
.action
|= ata_eh_speed_down(dev
, eflags
, all_err_mask
);
1988 * ata_eh_autopsy - analyze error and determine recovery action
1989 * @ap: host port to perform autopsy on
1991 * Analyze all links of @ap and determine why they failed and
1992 * which recovery actions are needed.
1995 * Kernel thread context (may sleep).
1997 void ata_eh_autopsy(struct ata_port
*ap
)
1999 struct ata_link
*link
;
2001 ata_port_for_each_link(link
, ap
)
2002 ata_eh_link_autopsy(link
);
2004 /* Handle the frigging slave link. Autopsy is done similarly
2005 * but actions and flags are transferred over to the master
2006 * link and handled from there.
2008 if (ap
->slave_link
) {
2009 struct ata_eh_context
*mehc
= &ap
->link
.eh_context
;
2010 struct ata_eh_context
*sehc
= &ap
->slave_link
->eh_context
;
2012 ata_eh_link_autopsy(ap
->slave_link
);
2014 ata_eh_about_to_do(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2015 mehc
->i
.action
|= sehc
->i
.action
;
2016 mehc
->i
.dev_action
[1] |= sehc
->i
.dev_action
[1];
2017 mehc
->i
.flags
|= sehc
->i
.flags
;
2018 ata_eh_done(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2021 /* Autopsy of fanout ports can affect host link autopsy.
2022 * Perform host link autopsy last.
2024 if (sata_pmp_attached(ap
))
2025 ata_eh_link_autopsy(&ap
->link
);
2029 * ata_eh_link_report - report error handling to user
2030 * @link: ATA link EH is going on
2032 * Report EH to user.
2037 static void ata_eh_link_report(struct ata_link
*link
)
2039 struct ata_port
*ap
= link
->ap
;
2040 struct ata_eh_context
*ehc
= &link
->eh_context
;
2041 const char *frozen
, *desc
;
2043 int tag
, nr_failed
= 0;
2045 if (ehc
->i
.flags
& ATA_EHI_QUIET
)
2049 if (ehc
->i
.desc
[0] != '\0')
2052 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2053 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2055 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2056 ata_dev_phys_link(qc
->dev
) != link
||
2057 ((qc
->flags
& ATA_QCFLAG_QUIET
) &&
2058 qc
->err_mask
== AC_ERR_DEV
))
2060 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
&& !qc
->err_mask
)
2066 if (!nr_failed
&& !ehc
->i
.err_mask
)
2070 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2073 memset(tries_buf
, 0, sizeof(tries_buf
));
2074 if (ap
->eh_tries
< ATA_EH_MAX_TRIES
)
2075 snprintf(tries_buf
, sizeof(tries_buf
) - 1, " t%d",
2079 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "exception Emask 0x%x "
2080 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2081 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2082 ehc
->i
.action
, frozen
, tries_buf
);
2084 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "%s\n", desc
);
2086 ata_link_printk(link
, KERN_ERR
, "exception Emask 0x%x "
2087 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2088 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2089 ehc
->i
.action
, frozen
, tries_buf
);
2091 ata_link_printk(link
, KERN_ERR
, "%s\n", desc
);
2095 ata_link_printk(link
, KERN_ERR
,
2096 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2097 ehc
->i
.serror
& SERR_DATA_RECOVERED
? "RecovData " : "",
2098 ehc
->i
.serror
& SERR_COMM_RECOVERED
? "RecovComm " : "",
2099 ehc
->i
.serror
& SERR_DATA
? "UnrecovData " : "",
2100 ehc
->i
.serror
& SERR_PERSISTENT
? "Persist " : "",
2101 ehc
->i
.serror
& SERR_PROTOCOL
? "Proto " : "",
2102 ehc
->i
.serror
& SERR_INTERNAL
? "HostInt " : "",
2103 ehc
->i
.serror
& SERR_PHYRDY_CHG
? "PHYRdyChg " : "",
2104 ehc
->i
.serror
& SERR_PHY_INT_ERR
? "PHYInt " : "",
2105 ehc
->i
.serror
& SERR_COMM_WAKE
? "CommWake " : "",
2106 ehc
->i
.serror
& SERR_10B_8B_ERR
? "10B8B " : "",
2107 ehc
->i
.serror
& SERR_DISPARITY
? "Dispar " : "",
2108 ehc
->i
.serror
& SERR_CRC
? "BadCRC " : "",
2109 ehc
->i
.serror
& SERR_HANDSHAKE
? "Handshk " : "",
2110 ehc
->i
.serror
& SERR_LINK_SEQ_ERR
? "LinkSeq " : "",
2111 ehc
->i
.serror
& SERR_TRANS_ST_ERROR
? "TrStaTrns " : "",
2112 ehc
->i
.serror
& SERR_UNRECOG_FIS
? "UnrecFIS " : "",
2113 ehc
->i
.serror
& SERR_DEV_XCHG
? "DevExch " : "");
2115 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2116 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2117 struct ata_taskfile
*cmd
= &qc
->tf
, *res
= &qc
->result_tf
;
2118 const u8
*cdb
= qc
->cdb
;
2119 char data_buf
[20] = "";
2120 char cdb_buf
[70] = "";
2122 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2123 ata_dev_phys_link(qc
->dev
) != link
|| !qc
->err_mask
)
2126 if (qc
->dma_dir
!= DMA_NONE
) {
2127 static const char *dma_str
[] = {
2128 [DMA_BIDIRECTIONAL
] = "bidi",
2129 [DMA_TO_DEVICE
] = "out",
2130 [DMA_FROM_DEVICE
] = "in",
2132 static const char *prot_str
[] = {
2133 [ATA_PROT_PIO
] = "pio",
2134 [ATA_PROT_DMA
] = "dma",
2135 [ATA_PROT_NCQ
] = "ncq",
2136 [ATAPI_PROT_PIO
] = "pio",
2137 [ATAPI_PROT_DMA
] = "dma",
2140 snprintf(data_buf
, sizeof(data_buf
), " %s %u %s",
2141 prot_str
[qc
->tf
.protocol
], qc
->nbytes
,
2142 dma_str
[qc
->dma_dir
]);
2145 if (ata_is_atapi(qc
->tf
.protocol
))
2146 snprintf(cdb_buf
, sizeof(cdb_buf
),
2147 "cdb %02x %02x %02x %02x %02x %02x %02x %02x "
2148 "%02x %02x %02x %02x %02x %02x %02x %02x\n ",
2149 cdb
[0], cdb
[1], cdb
[2], cdb
[3],
2150 cdb
[4], cdb
[5], cdb
[6], cdb
[7],
2151 cdb
[8], cdb
[9], cdb
[10], cdb
[11],
2152 cdb
[12], cdb
[13], cdb
[14], cdb
[15]);
2154 ata_dev_printk(qc
->dev
, KERN_ERR
,
2155 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2157 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2158 "Emask 0x%x (%s)%s\n",
2159 cmd
->command
, cmd
->feature
, cmd
->nsect
,
2160 cmd
->lbal
, cmd
->lbam
, cmd
->lbah
,
2161 cmd
->hob_feature
, cmd
->hob_nsect
,
2162 cmd
->hob_lbal
, cmd
->hob_lbam
, cmd
->hob_lbah
,
2163 cmd
->device
, qc
->tag
, data_buf
, cdb_buf
,
2164 res
->command
, res
->feature
, res
->nsect
,
2165 res
->lbal
, res
->lbam
, res
->lbah
,
2166 res
->hob_feature
, res
->hob_nsect
,
2167 res
->hob_lbal
, res
->hob_lbam
, res
->hob_lbah
,
2168 res
->device
, qc
->err_mask
, ata_err_string(qc
->err_mask
),
2169 qc
->err_mask
& AC_ERR_NCQ
? " <F>" : "");
2171 if (res
->command
& (ATA_BUSY
| ATA_DRDY
| ATA_DF
| ATA_DRQ
|
2173 if (res
->command
& ATA_BUSY
)
2174 ata_dev_printk(qc
->dev
, KERN_ERR
,
2175 "status: { Busy }\n");
2177 ata_dev_printk(qc
->dev
, KERN_ERR
,
2178 "status: { %s%s%s%s}\n",
2179 res
->command
& ATA_DRDY
? "DRDY " : "",
2180 res
->command
& ATA_DF
? "DF " : "",
2181 res
->command
& ATA_DRQ
? "DRQ " : "",
2182 res
->command
& ATA_ERR
? "ERR " : "");
2185 if (cmd
->command
!= ATA_CMD_PACKET
&&
2186 (res
->feature
& (ATA_ICRC
| ATA_UNC
| ATA_IDNF
|
2188 ata_dev_printk(qc
->dev
, KERN_ERR
,
2189 "error: { %s%s%s%s}\n",
2190 res
->feature
& ATA_ICRC
? "ICRC " : "",
2191 res
->feature
& ATA_UNC
? "UNC " : "",
2192 res
->feature
& ATA_IDNF
? "IDNF " : "",
2193 res
->feature
& ATA_ABORTED
? "ABRT " : "");
2198 * ata_eh_report - report error handling to user
2199 * @ap: ATA port to report EH about
2201 * Report EH to user.
2206 void ata_eh_report(struct ata_port
*ap
)
2208 struct ata_link
*link
;
2210 __ata_port_for_each_link(link
, ap
)
2211 ata_eh_link_report(link
);
2214 static int ata_do_reset(struct ata_link
*link
, ata_reset_fn_t reset
,
2215 unsigned int *classes
, unsigned long deadline
,
2218 struct ata_device
*dev
;
2221 ata_link_for_each_dev(dev
, link
)
2222 classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
2224 return reset(link
, classes
, deadline
);
2227 static int ata_eh_followup_srst_needed(struct ata_link
*link
,
2228 int rc
, const unsigned int *classes
)
2230 if ((link
->flags
& ATA_LFLAG_NO_SRST
) || ata_link_offline(link
))
2234 if (sata_pmp_supported(link
->ap
) && ata_is_host_link(link
))
2239 int ata_eh_reset(struct ata_link
*link
, int classify
,
2240 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
2241 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
2243 struct ata_port
*ap
= link
->ap
;
2244 struct ata_link
*slave
= ap
->slave_link
;
2245 struct ata_eh_context
*ehc
= &link
->eh_context
;
2246 struct ata_eh_context
*sehc
= &slave
->eh_context
;
2247 unsigned int *classes
= ehc
->classes
;
2248 unsigned int lflags
= link
->flags
;
2249 int verbose
= !(ehc
->i
.flags
& ATA_EHI_QUIET
);
2250 int max_tries
= 0, try = 0;
2251 struct ata_link
*failed_link
;
2252 struct ata_device
*dev
;
2253 unsigned long deadline
, now
;
2254 ata_reset_fn_t reset
;
2255 unsigned long flags
;
2262 while (ata_eh_reset_timeouts
[max_tries
] != ULONG_MAX
)
2264 if (link
->flags
& ATA_LFLAG_NO_HRST
)
2266 if (link
->flags
& ATA_LFLAG_NO_SRST
)
2270 deadline
= ata_deadline(ehc
->last_reset
, ATA_EH_RESET_COOL_DOWN
);
2271 if (time_before(now
, deadline
))
2272 schedule_timeout_uninterruptible(deadline
- now
);
2274 spin_lock_irqsave(ap
->lock
, flags
);
2275 ap
->pflags
|= ATA_PFLAG_RESETTING
;
2276 spin_unlock_irqrestore(ap
->lock
, flags
);
2278 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2279 ehc
->last_reset
= jiffies
;
2281 ata_link_for_each_dev(dev
, link
) {
2282 /* If we issue an SRST then an ATA drive (not ATAPI)
2283 * may change configuration and be in PIO0 timing. If
2284 * we do a hard reset (or are coming from power on)
2285 * this is true for ATA or ATAPI. Until we've set a
2286 * suitable controller mode we should not touch the
2287 * bus as we may be talking too fast.
2289 dev
->pio_mode
= XFER_PIO_0
;
2291 /* If the controller has a pio mode setup function
2292 * then use it to set the chipset to rights. Don't
2293 * touch the DMA setup as that will be dealt with when
2294 * configuring devices.
2296 if (ap
->ops
->set_piomode
)
2297 ap
->ops
->set_piomode(ap
, dev
);
2300 /* prefer hardreset */
2302 ehc
->i
.action
&= ~ATA_EH_RESET
;
2305 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2306 } else if (softreset
) {
2308 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2312 unsigned long deadline
= ata_deadline(jiffies
,
2313 ATA_EH_PRERESET_TIMEOUT
);
2316 sehc
->i
.action
&= ~ATA_EH_RESET
;
2317 sehc
->i
.action
|= ehc
->i
.action
;
2320 rc
= prereset(link
, deadline
);
2322 /* If present, do prereset on slave link too. Reset
2323 * is skipped iff both master and slave links report
2324 * -ENOENT or clear ATA_EH_RESET.
2326 if (slave
&& (rc
== 0 || rc
== -ENOENT
)) {
2329 tmp
= prereset(slave
, deadline
);
2333 ehc
->i
.action
|= sehc
->i
.action
;
2337 if (rc
== -ENOENT
) {
2338 ata_link_printk(link
, KERN_DEBUG
,
2339 "port disabled. ignoring.\n");
2340 ehc
->i
.action
&= ~ATA_EH_RESET
;
2342 ata_link_for_each_dev(dev
, link
)
2343 classes
[dev
->devno
] = ATA_DEV_NONE
;
2347 ata_link_printk(link
, KERN_ERR
,
2348 "prereset failed (errno=%d)\n", rc
);
2352 /* prereset() might have cleared ATA_EH_RESET. If so,
2353 * bang classes and return.
2355 if (reset
&& !(ehc
->i
.action
& ATA_EH_RESET
)) {
2356 ata_link_for_each_dev(dev
, link
)
2357 classes
[dev
->devno
] = ATA_DEV_NONE
;
2367 ehc
->last_reset
= jiffies
;
2368 if (ata_is_host_link(link
))
2369 ata_eh_freeze_port(ap
);
2371 deadline
= ata_deadline(jiffies
, ata_eh_reset_timeouts
[try++]);
2375 ata_link_printk(link
, KERN_INFO
, "%s resetting link\n",
2376 reset
== softreset
? "soft" : "hard");
2378 /* mark that this EH session started with reset */
2379 if (reset
== hardreset
)
2380 ehc
->i
.flags
|= ATA_EHI_DID_HARDRESET
;
2382 ehc
->i
.flags
|= ATA_EHI_DID_SOFTRESET
;
2384 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2385 if (rc
&& rc
!= -EAGAIN
) {
2390 /* hardreset slave link if existent */
2391 if (slave
&& reset
== hardreset
) {
2395 ata_link_printk(slave
, KERN_INFO
,
2396 "hard resetting link\n");
2398 ata_eh_about_to_do(slave
, NULL
, ATA_EH_RESET
);
2399 tmp
= ata_do_reset(slave
, reset
, classes
, deadline
,
2407 failed_link
= slave
;
2413 /* perform follow-up SRST if necessary */
2414 if (reset
== hardreset
&&
2415 ata_eh_followup_srst_needed(link
, rc
, classes
)) {
2419 ata_link_printk(link
, KERN_ERR
,
2420 "follow-up softreset required "
2421 "but no softreset avaliable\n");
2427 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2428 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2432 ata_link_printk(link
, KERN_INFO
, "no reset method "
2433 "available, skipping reset\n");
2434 if (!(lflags
& ATA_LFLAG_ASSUME_CLASS
))
2435 lflags
|= ATA_LFLAG_ASSUME_ATA
;
2439 * Post-reset processing
2441 ata_link_for_each_dev(dev
, link
) {
2442 /* After the reset, the device state is PIO 0 and the
2443 * controller state is undefined. Reset also wakes up
2444 * drives from sleeping mode.
2446 dev
->pio_mode
= XFER_PIO_0
;
2447 dev
->flags
&= ~ATA_DFLAG_SLEEPING
;
2449 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
2452 /* apply class override */
2453 if (lflags
& ATA_LFLAG_ASSUME_ATA
)
2454 classes
[dev
->devno
] = ATA_DEV_ATA
;
2455 else if (lflags
& ATA_LFLAG_ASSUME_SEMB
)
2456 classes
[dev
->devno
] = ATA_DEV_SEMB_UNSUP
; /* not yet */
2459 /* record current link speed */
2460 if (sata_scr_read(link
, SCR_STATUS
, &sstatus
) == 0)
2461 link
->sata_spd
= (sstatus
>> 4) & 0xf;
2462 if (slave
&& sata_scr_read(slave
, SCR_STATUS
, &sstatus
) == 0)
2463 slave
->sata_spd
= (sstatus
>> 4) & 0xf;
2466 if (ata_is_host_link(link
))
2467 ata_eh_thaw_port(ap
);
2469 /* postreset() should clear hardware SError. Although SError
2470 * is cleared during link resume, clearing SError here is
2471 * necessary as some PHYs raise hotplug events after SRST.
2472 * This introduces race condition where hotplug occurs between
2473 * reset and here. This race is mediated by cross checking
2474 * link onlineness and classification result later.
2477 postreset(link
, classes
);
2479 postreset(slave
, classes
);
2482 /* clear cached SError */
2483 spin_lock_irqsave(link
->ap
->lock
, flags
);
2484 link
->eh_info
.serror
= 0;
2486 slave
->eh_info
.serror
= 0;
2487 spin_unlock_irqrestore(link
->ap
->lock
, flags
);
2489 /* Make sure onlineness and classification result correspond.
2490 * Hotplug could have happened during reset and some
2491 * controllers fail to wait while a drive is spinning up after
2492 * being hotplugged causing misdetection. By cross checking
2493 * link onlineness and classification result, those conditions
2494 * can be reliably detected and retried.
2497 ata_link_for_each_dev(dev
, link
) {
2498 /* convert all ATA_DEV_UNKNOWN to ATA_DEV_NONE */
2499 if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
2500 classes
[dev
->devno
] = ATA_DEV_NONE
;
2501 if (ata_phys_link_online(ata_dev_phys_link(dev
)))
2506 if (classify
&& nr_unknown
) {
2507 if (try < max_tries
) {
2508 ata_link_printk(link
, KERN_WARNING
, "link online but "
2509 "device misclassified, retrying\n");
2514 ata_link_printk(link
, KERN_WARNING
,
2515 "link online but device misclassified, "
2516 "device detection might fail\n");
2519 /* reset successful, schedule revalidation */
2520 ata_eh_done(link
, NULL
, ATA_EH_RESET
);
2522 ata_eh_done(slave
, NULL
, ATA_EH_RESET
);
2523 ehc
->last_reset
= jiffies
;
2524 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2528 /* clear hotplug flag */
2529 ehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2531 sehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2533 spin_lock_irqsave(ap
->lock
, flags
);
2534 ap
->pflags
&= ~ATA_PFLAG_RESETTING
;
2535 spin_unlock_irqrestore(ap
->lock
, flags
);
2540 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2541 if (!ata_is_host_link(link
) &&
2542 sata_scr_read(link
, SCR_STATUS
, &sstatus
))
2545 if (rc
== -ERESTART
|| try >= max_tries
)
2549 if (time_before(now
, deadline
)) {
2550 unsigned long delta
= deadline
- now
;
2552 ata_link_printk(failed_link
, KERN_WARNING
,
2553 "reset failed (errno=%d), retrying in %u secs\n",
2554 rc
, DIV_ROUND_UP(jiffies_to_msecs(delta
), 1000));
2557 delta
= schedule_timeout_uninterruptible(delta
);
2560 if (try == max_tries
- 1) {
2561 sata_down_spd_limit(link
);
2563 sata_down_spd_limit(slave
);
2564 } else if (rc
== -EPIPE
)
2565 sata_down_spd_limit(failed_link
);
2572 static inline void ata_eh_pull_park_action(struct ata_port
*ap
)
2574 struct ata_link
*link
;
2575 struct ata_device
*dev
;
2576 unsigned long flags
;
2579 * This function can be thought of as an extended version of
2580 * ata_eh_about_to_do() specially crafted to accommodate the
2581 * requirements of ATA_EH_PARK handling. Since the EH thread
2582 * does not leave the do {} while () loop in ata_eh_recover as
2583 * long as the timeout for a park request to *one* device on
2584 * the port has not expired, and since we still want to pick
2585 * up park requests to other devices on the same port or
2586 * timeout updates for the same device, we have to pull
2587 * ATA_EH_PARK actions from eh_info into eh_context.i
2588 * ourselves at the beginning of each pass over the loop.
2590 * Additionally, all write accesses to &ap->park_req_pending
2591 * through INIT_COMPLETION() (see below) or complete_all()
2592 * (see ata_scsi_park_store()) are protected by the host lock.
2593 * As a result we have that park_req_pending.done is zero on
2594 * exit from this function, i.e. when ATA_EH_PARK actions for
2595 * *all* devices on port ap have been pulled into the
2596 * respective eh_context structs. If, and only if,
2597 * park_req_pending.done is non-zero by the time we reach
2598 * wait_for_completion_timeout(), another ATA_EH_PARK action
2599 * has been scheduled for at least one of the devices on port
2600 * ap and we have to cycle over the do {} while () loop in
2601 * ata_eh_recover() again.
2604 spin_lock_irqsave(ap
->lock
, flags
);
2605 INIT_COMPLETION(ap
->park_req_pending
);
2606 ata_port_for_each_link(link
, ap
) {
2607 ata_link_for_each_dev(dev
, link
) {
2608 struct ata_eh_info
*ehi
= &link
->eh_info
;
2610 link
->eh_context
.i
.dev_action
[dev
->devno
] |=
2611 ehi
->dev_action
[dev
->devno
] & ATA_EH_PARK
;
2612 ata_eh_clear_action(link
, dev
, ehi
, ATA_EH_PARK
);
2615 spin_unlock_irqrestore(ap
->lock
, flags
);
2618 static void ata_eh_park_issue_cmd(struct ata_device
*dev
, int park
)
2620 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
2621 struct ata_taskfile tf
;
2622 unsigned int err_mask
;
2624 ata_tf_init(dev
, &tf
);
2626 ehc
->unloaded_mask
|= 1 << dev
->devno
;
2627 tf
.command
= ATA_CMD_IDLEIMMEDIATE
;
2633 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
2634 tf
.command
= ATA_CMD_CHK_POWER
;
2637 tf
.flags
|= ATA_TFLAG_DEVICE
| ATA_TFLAG_ISADDR
;
2638 tf
.protocol
|= ATA_PROT_NODATA
;
2639 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
2640 if (park
&& (err_mask
|| tf
.lbal
!= 0xc4)) {
2641 ata_dev_printk(dev
, KERN_ERR
, "head unload failed!\n");
2642 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
2646 static int ata_eh_revalidate_and_attach(struct ata_link
*link
,
2647 struct ata_device
**r_failed_dev
)
2649 struct ata_port
*ap
= link
->ap
;
2650 struct ata_eh_context
*ehc
= &link
->eh_context
;
2651 struct ata_device
*dev
;
2652 unsigned int new_mask
= 0;
2653 unsigned long flags
;
2658 /* For PATA drive side cable detection to work, IDENTIFY must
2659 * be done backwards such that PDIAG- is released by the slave
2660 * device before the master device is identified.
2662 ata_link_for_each_dev_reverse(dev
, link
) {
2663 unsigned int action
= ata_eh_dev_action(dev
);
2664 unsigned int readid_flags
= 0;
2666 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
2667 readid_flags
|= ATA_READID_POSTRESET
;
2669 if ((action
& ATA_EH_REVALIDATE
) && ata_dev_enabled(dev
)) {
2670 WARN_ON(dev
->class == ATA_DEV_PMP
);
2672 if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
2677 ata_eh_about_to_do(link
, dev
, ATA_EH_REVALIDATE
);
2678 rc
= ata_dev_revalidate(dev
, ehc
->classes
[dev
->devno
],
2683 ata_eh_done(link
, dev
, ATA_EH_REVALIDATE
);
2685 /* Configuration may have changed, reconfigure
2688 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
2690 /* schedule the scsi_rescan_device() here */
2691 queue_work(ata_aux_wq
, &(ap
->scsi_rescan_task
));
2692 } else if (dev
->class == ATA_DEV_UNKNOWN
&&
2693 ehc
->tries
[dev
->devno
] &&
2694 ata_class_enabled(ehc
->classes
[dev
->devno
])) {
2695 dev
->class = ehc
->classes
[dev
->devno
];
2697 if (dev
->class == ATA_DEV_PMP
)
2698 rc
= sata_pmp_attach(dev
);
2700 rc
= ata_dev_read_id(dev
, &dev
->class,
2701 readid_flags
, dev
->id
);
2704 new_mask
|= 1 << dev
->devno
;
2707 /* IDENTIFY was issued to non-existent
2708 * device. No need to reset. Just
2709 * thaw and kill the device.
2711 ata_eh_thaw_port(ap
);
2712 dev
->class = ATA_DEV_UNKNOWN
;
2715 dev
->class = ATA_DEV_UNKNOWN
;
2721 /* PDIAG- should have been released, ask cable type if post-reset */
2722 if ((ehc
->i
.flags
& ATA_EHI_DID_RESET
) && ata_is_host_link(link
)) {
2723 if (ap
->ops
->cable_detect
)
2724 ap
->cbl
= ap
->ops
->cable_detect(ap
);
2728 /* Configure new devices forward such that user doesn't see
2729 * device detection messages backwards.
2731 ata_link_for_each_dev(dev
, link
) {
2732 if (!(new_mask
& (1 << dev
->devno
)) ||
2733 dev
->class == ATA_DEV_PMP
)
2736 ehc
->i
.flags
|= ATA_EHI_PRINTINFO
;
2737 rc
= ata_dev_configure(dev
);
2738 ehc
->i
.flags
&= ~ATA_EHI_PRINTINFO
;
2742 spin_lock_irqsave(ap
->lock
, flags
);
2743 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
2744 spin_unlock_irqrestore(ap
->lock
, flags
);
2746 /* new device discovered, configure xfermode */
2747 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
2753 *r_failed_dev
= dev
;
2754 DPRINTK("EXIT rc=%d\n", rc
);
2759 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2760 * @link: link on which timings will be programmed
2761 * @r_failed_dev: out paramter for failed device
2763 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2764 * ata_set_mode() fails, pointer to the failing device is
2765 * returned in @r_failed_dev.
2768 * PCI/etc. bus probe sem.
2771 * 0 on success, negative errno otherwise
2773 int ata_set_mode(struct ata_link
*link
, struct ata_device
**r_failed_dev
)
2775 struct ata_port
*ap
= link
->ap
;
2776 struct ata_device
*dev
;
2779 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
2780 ata_link_for_each_dev(dev
, link
) {
2781 if (!(dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)) {
2782 struct ata_ering_entry
*ent
;
2784 ent
= ata_ering_top(&dev
->ering
);
2786 ent
->eflags
&= ~ATA_EFLAG_DUBIOUS_XFER
;
2790 /* has private set_mode? */
2791 if (ap
->ops
->set_mode
)
2792 rc
= ap
->ops
->set_mode(link
, r_failed_dev
);
2794 rc
= ata_do_set_mode(link
, r_failed_dev
);
2796 /* if transfer mode has changed, set DUBIOUS_XFER on device */
2797 ata_link_for_each_dev(dev
, link
) {
2798 struct ata_eh_context
*ehc
= &link
->eh_context
;
2799 u8 saved_xfer_mode
= ehc
->saved_xfer_mode
[dev
->devno
];
2800 u8 saved_ncq
= !!(ehc
->saved_ncq_enabled
& (1 << dev
->devno
));
2802 if (dev
->xfer_mode
!= saved_xfer_mode
||
2803 ata_ncq_enabled(dev
) != saved_ncq
)
2804 dev
->flags
|= ATA_DFLAG_DUBIOUS_XFER
;
2811 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
2812 * @dev: ATAPI device to clear UA for
2814 * Resets and other operations can make an ATAPI device raise
2815 * UNIT ATTENTION which causes the next operation to fail. This
2816 * function clears UA.
2819 * EH context (may sleep).
2822 * 0 on success, -errno on failure.
2824 static int atapi_eh_clear_ua(struct ata_device
*dev
)
2828 for (i
= 0; i
< ATA_EH_UA_TRIES
; i
++) {
2829 u8 sense_buffer
[SCSI_SENSE_BUFFERSIZE
];
2831 unsigned int err_mask
;
2833 err_mask
= atapi_eh_tur(dev
, &sense_key
);
2834 if (err_mask
!= 0 && err_mask
!= AC_ERR_DEV
) {
2835 ata_dev_printk(dev
, KERN_WARNING
, "TEST_UNIT_READY "
2836 "failed (err_mask=0x%x)\n", err_mask
);
2840 if (!err_mask
|| sense_key
!= UNIT_ATTENTION
)
2843 err_mask
= atapi_eh_request_sense(dev
, sense_buffer
, sense_key
);
2845 ata_dev_printk(dev
, KERN_WARNING
, "failed to clear "
2846 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask
);
2851 ata_dev_printk(dev
, KERN_WARNING
,
2852 "UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES
);
2857 static int ata_link_nr_enabled(struct ata_link
*link
)
2859 struct ata_device
*dev
;
2862 ata_link_for_each_dev(dev
, link
)
2863 if (ata_dev_enabled(dev
))
2868 static int ata_link_nr_vacant(struct ata_link
*link
)
2870 struct ata_device
*dev
;
2873 ata_link_for_each_dev(dev
, link
)
2874 if (dev
->class == ATA_DEV_UNKNOWN
)
2879 static int ata_eh_skip_recovery(struct ata_link
*link
)
2881 struct ata_port
*ap
= link
->ap
;
2882 struct ata_eh_context
*ehc
= &link
->eh_context
;
2883 struct ata_device
*dev
;
2885 /* skip disabled links */
2886 if (link
->flags
& ATA_LFLAG_DISABLED
)
2889 /* thaw frozen port and recover failed devices */
2890 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) || ata_link_nr_enabled(link
))
2893 /* reset at least once if reset is requested */
2894 if ((ehc
->i
.action
& ATA_EH_RESET
) &&
2895 !(ehc
->i
.flags
& ATA_EHI_DID_RESET
))
2898 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
2899 ata_link_for_each_dev(dev
, link
) {
2900 if (dev
->class == ATA_DEV_UNKNOWN
&&
2901 ehc
->classes
[dev
->devno
] != ATA_DEV_NONE
)
2908 static int ata_eh_schedule_probe(struct ata_device
*dev
)
2910 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
2912 if (!(ehc
->i
.probe_mask
& (1 << dev
->devno
)) ||
2913 (ehc
->did_probe_mask
& (1 << dev
->devno
)))
2916 ata_eh_detach_dev(dev
);
2918 ehc
->did_probe_mask
|= (1 << dev
->devno
);
2919 ehc
->i
.action
|= ATA_EH_RESET
;
2920 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
2921 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
2926 static int ata_eh_handle_dev_fail(struct ata_device
*dev
, int err
)
2928 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
2930 ehc
->tries
[dev
->devno
]--;
2934 /* device missing or wrong IDENTIFY data, schedule probing */
2935 ehc
->i
.probe_mask
|= (1 << dev
->devno
);
2937 /* give it just one more chance */
2938 ehc
->tries
[dev
->devno
] = min(ehc
->tries
[dev
->devno
], 1);
2940 if (ehc
->tries
[dev
->devno
] == 1 && dev
->pio_mode
> XFER_PIO_0
) {
2941 /* This is the last chance, better to slow
2942 * down than lose it.
2944 sata_down_spd_limit(ata_dev_phys_link(dev
));
2945 ata_down_xfermask_limit(dev
, ATA_DNXFER_PIO
);
2949 if (ata_dev_enabled(dev
) && !ehc
->tries
[dev
->devno
]) {
2950 /* disable device if it has used up all its chances */
2951 ata_dev_disable(dev
);
2953 /* detach if offline */
2954 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
2955 ata_eh_detach_dev(dev
);
2957 /* schedule probe if necessary */
2958 if (ata_eh_schedule_probe(dev
)) {
2959 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
2960 memset(ehc
->cmd_timeout_idx
[dev
->devno
], 0,
2961 sizeof(ehc
->cmd_timeout_idx
[dev
->devno
]));
2966 ehc
->i
.action
|= ATA_EH_RESET
;
2972 * ata_eh_recover - recover host port after error
2973 * @ap: host port to recover
2974 * @prereset: prereset method (can be NULL)
2975 * @softreset: softreset method (can be NULL)
2976 * @hardreset: hardreset method (can be NULL)
2977 * @postreset: postreset method (can be NULL)
2978 * @r_failed_link: out parameter for failed link
2980 * This is the alpha and omega, eum and yang, heart and soul of
2981 * libata exception handling. On entry, actions required to
2982 * recover each link and hotplug requests are recorded in the
2983 * link's eh_context. This function executes all the operations
2984 * with appropriate retrials and fallbacks to resurrect failed
2985 * devices, detach goners and greet newcomers.
2988 * Kernel thread context (may sleep).
2991 * 0 on success, -errno on failure.
2993 int ata_eh_recover(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
2994 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
2995 ata_postreset_fn_t postreset
,
2996 struct ata_link
**r_failed_link
)
2998 struct ata_link
*link
;
2999 struct ata_device
*dev
;
3002 unsigned long flags
, deadline
;
3006 /* prep for recovery */
3007 ata_port_for_each_link(link
, ap
) {
3008 struct ata_eh_context
*ehc
= &link
->eh_context
;
3010 /* re-enable link? */
3011 if (ehc
->i
.action
& ATA_EH_ENABLE_LINK
) {
3012 ata_eh_about_to_do(link
, NULL
, ATA_EH_ENABLE_LINK
);
3013 spin_lock_irqsave(ap
->lock
, flags
);
3014 link
->flags
&= ~ATA_LFLAG_DISABLED
;
3015 spin_unlock_irqrestore(ap
->lock
, flags
);
3016 ata_eh_done(link
, NULL
, ATA_EH_ENABLE_LINK
);
3019 ata_link_for_each_dev(dev
, link
) {
3020 if (link
->flags
& ATA_LFLAG_NO_RETRY
)
3021 ehc
->tries
[dev
->devno
] = 1;
3023 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3025 /* collect port action mask recorded in dev actions */
3026 ehc
->i
.action
|= ehc
->i
.dev_action
[dev
->devno
] &
3027 ~ATA_EH_PERDEV_MASK
;
3028 ehc
->i
.dev_action
[dev
->devno
] &= ATA_EH_PERDEV_MASK
;
3030 /* process hotplug request */
3031 if (dev
->flags
& ATA_DFLAG_DETACH
)
3032 ata_eh_detach_dev(dev
);
3034 /* schedule probe if necessary */
3035 if (!ata_dev_enabled(dev
))
3036 ata_eh_schedule_probe(dev
);
3044 /* if UNLOADING, finish immediately */
3045 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
3049 ata_port_for_each_link(link
, ap
) {
3050 struct ata_eh_context
*ehc
= &link
->eh_context
;
3052 /* skip EH if possible. */
3053 if (ata_eh_skip_recovery(link
))
3056 ata_link_for_each_dev(dev
, link
)
3057 ehc
->classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
3061 ata_port_for_each_link(link
, ap
) {
3062 struct ata_eh_context
*ehc
= &link
->eh_context
;
3064 if (!(ehc
->i
.action
& ATA_EH_RESET
))
3067 rc
= ata_eh_reset(link
, ata_link_nr_vacant(link
),
3068 prereset
, softreset
, hardreset
, postreset
);
3070 ata_link_printk(link
, KERN_ERR
,
3071 "reset failed, giving up\n");
3080 * clears ATA_EH_PARK in eh_info and resets
3081 * ap->park_req_pending
3083 ata_eh_pull_park_action(ap
);
3086 ata_port_for_each_link(link
, ap
) {
3087 ata_link_for_each_dev(dev
, link
) {
3088 struct ata_eh_context
*ehc
= &link
->eh_context
;
3091 if (dev
->class != ATA_DEV_ATA
)
3093 if (!(ehc
->i
.dev_action
[dev
->devno
] &
3096 tmp
= dev
->unpark_deadline
;
3097 if (time_before(deadline
, tmp
))
3099 else if (time_before_eq(tmp
, jiffies
))
3101 if (ehc
->unloaded_mask
& (1 << dev
->devno
))
3104 ata_eh_park_issue_cmd(dev
, 1);
3109 if (time_before_eq(deadline
, now
))
3112 deadline
= wait_for_completion_timeout(&ap
->park_req_pending
,
3115 ata_port_for_each_link(link
, ap
) {
3116 ata_link_for_each_dev(dev
, link
) {
3117 if (!(link
->eh_context
.unloaded_mask
&
3121 ata_eh_park_issue_cmd(dev
, 0);
3122 ata_eh_done(link
, dev
, ATA_EH_PARK
);
3127 ata_port_for_each_link(link
, ap
) {
3128 struct ata_eh_context
*ehc
= &link
->eh_context
;
3130 /* revalidate existing devices and attach new ones */
3131 rc
= ata_eh_revalidate_and_attach(link
, &dev
);
3135 /* if PMP got attached, return, pmp EH will take care of it */
3136 if (link
->device
->class == ATA_DEV_PMP
) {
3141 /* configure transfer mode if necessary */
3142 if (ehc
->i
.flags
& ATA_EHI_SETMODE
) {
3143 rc
= ata_set_mode(link
, &dev
);
3146 ehc
->i
.flags
&= ~ATA_EHI_SETMODE
;
3149 /* If reset has been issued, clear UA to avoid
3150 * disrupting the current users of the device.
3152 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
3153 ata_link_for_each_dev(dev
, link
) {
3154 if (dev
->class != ATA_DEV_ATAPI
)
3156 rc
= atapi_eh_clear_ua(dev
);
3162 /* configure link power saving */
3163 if (ehc
->i
.action
& ATA_EH_LPM
)
3164 ata_link_for_each_dev(dev
, link
)
3165 ata_dev_enable_pm(dev
, ap
->pm_policy
);
3167 /* this link is okay now */
3173 ata_eh_handle_dev_fail(dev
, rc
);
3175 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
3176 /* PMP reset requires working host port.
3177 * Can't retry if it's frozen.
3179 if (sata_pmp_attached(ap
))
3189 if (rc
&& r_failed_link
)
3190 *r_failed_link
= link
;
3192 DPRINTK("EXIT, rc=%d\n", rc
);
3197 * ata_eh_finish - finish up EH
3198 * @ap: host port to finish EH for
3200 * Recovery is complete. Clean up EH states and retry or finish
3206 void ata_eh_finish(struct ata_port
*ap
)
3210 /* retry or finish qcs */
3211 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
3212 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
3214 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
3218 /* FIXME: Once EH migration is complete,
3219 * generate sense data in this function,
3220 * considering both err_mask and tf.
3222 if (qc
->flags
& ATA_QCFLAG_RETRY
)
3223 ata_eh_qc_retry(qc
);
3225 ata_eh_qc_complete(qc
);
3227 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
3228 ata_eh_qc_complete(qc
);
3230 /* feed zero TF to sense generation */
3231 memset(&qc
->result_tf
, 0, sizeof(qc
->result_tf
));
3232 ata_eh_qc_retry(qc
);
3237 /* make sure nr_active_links is zero after EH */
3238 WARN_ON(ap
->nr_active_links
);
3239 ap
->nr_active_links
= 0;
3243 * ata_do_eh - do standard error handling
3244 * @ap: host port to handle error for
3246 * @prereset: prereset method (can be NULL)
3247 * @softreset: softreset method (can be NULL)
3248 * @hardreset: hardreset method (can be NULL)
3249 * @postreset: postreset method (can be NULL)
3251 * Perform standard error handling sequence.
3254 * Kernel thread context (may sleep).
3256 void ata_do_eh(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3257 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3258 ata_postreset_fn_t postreset
)
3260 struct ata_device
*dev
;
3266 rc
= ata_eh_recover(ap
, prereset
, softreset
, hardreset
, postreset
,
3269 ata_link_for_each_dev(dev
, &ap
->link
)
3270 ata_dev_disable(dev
);
3277 * ata_std_error_handler - standard error handler
3278 * @ap: host port to handle error for
3280 * Standard error handler
3283 * Kernel thread context (may sleep).
3285 void ata_std_error_handler(struct ata_port
*ap
)
3287 struct ata_port_operations
*ops
= ap
->ops
;
3288 ata_reset_fn_t hardreset
= ops
->hardreset
;
3290 /* ignore built-in hardreset if SCR access is not available */
3291 if (ata_is_builtin_hardreset(hardreset
) && !sata_scr_valid(&ap
->link
))
3294 ata_do_eh(ap
, ops
->prereset
, ops
->softreset
, hardreset
, ops
->postreset
);
3299 * ata_eh_handle_port_suspend - perform port suspend operation
3300 * @ap: port to suspend
3305 * Kernel thread context (may sleep).
3307 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
3309 unsigned long flags
;
3312 /* are we suspending? */
3313 spin_lock_irqsave(ap
->lock
, flags
);
3314 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
3315 ap
->pm_mesg
.event
== PM_EVENT_ON
) {
3316 spin_unlock_irqrestore(ap
->lock
, flags
);
3319 spin_unlock_irqrestore(ap
->lock
, flags
);
3321 WARN_ON(ap
->pflags
& ATA_PFLAG_SUSPENDED
);
3323 /* tell ACPI we're suspending */
3324 rc
= ata_acpi_on_suspend(ap
);
3329 ata_eh_freeze_port(ap
);
3331 if (ap
->ops
->port_suspend
)
3332 rc
= ap
->ops
->port_suspend(ap
, ap
->pm_mesg
);
3334 ata_acpi_set_state(ap
, PMSG_SUSPEND
);
3337 spin_lock_irqsave(ap
->lock
, flags
);
3339 ap
->pflags
&= ~ATA_PFLAG_PM_PENDING
;
3341 ap
->pflags
|= ATA_PFLAG_SUSPENDED
;
3342 else if (ap
->pflags
& ATA_PFLAG_FROZEN
)
3343 ata_port_schedule_eh(ap
);
3345 if (ap
->pm_result
) {
3346 *ap
->pm_result
= rc
;
3347 ap
->pm_result
= NULL
;
3350 spin_unlock_irqrestore(ap
->lock
, flags
);
3356 * ata_eh_handle_port_resume - perform port resume operation
3357 * @ap: port to resume
3362 * Kernel thread context (may sleep).
3364 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
3366 unsigned long flags
;
3369 /* are we resuming? */
3370 spin_lock_irqsave(ap
->lock
, flags
);
3371 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
3372 ap
->pm_mesg
.event
!= PM_EVENT_ON
) {
3373 spin_unlock_irqrestore(ap
->lock
, flags
);
3376 spin_unlock_irqrestore(ap
->lock
, flags
);
3378 WARN_ON(!(ap
->pflags
& ATA_PFLAG_SUSPENDED
));
3380 ata_acpi_set_state(ap
, PMSG_ON
);
3382 if (ap
->ops
->port_resume
)
3383 rc
= ap
->ops
->port_resume(ap
);
3385 /* tell ACPI that we're resuming */
3386 ata_acpi_on_resume(ap
);
3389 spin_lock_irqsave(ap
->lock
, flags
);
3390 ap
->pflags
&= ~(ATA_PFLAG_PM_PENDING
| ATA_PFLAG_SUSPENDED
);
3391 if (ap
->pm_result
) {
3392 *ap
->pm_result
= rc
;
3393 ap
->pm_result
= NULL
;
3395 spin_unlock_irqrestore(ap
->lock
, flags
);
3397 #endif /* CONFIG_PM */