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
);
553 static void ata_eh_unload(struct ata_port
*ap
)
555 struct ata_link
*link
;
556 struct ata_device
*dev
;
559 /* Restore SControl IPM and SPD for the next driver and
560 * disable attached devices.
562 ata_for_each_link(link
, ap
, PMP_FIRST
) {
563 sata_scr_write(link
, SCR_CONTROL
, link
->saved_scontrol
& 0xff0);
564 ata_for_each_dev(dev
, link
, ALL
)
565 ata_dev_disable(dev
);
568 /* freeze and set UNLOADED */
569 spin_lock_irqsave(ap
->lock
, flags
);
571 ata_port_freeze(ap
); /* won't be thawed */
572 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
; /* clear pending from freeze */
573 ap
->pflags
|= ATA_PFLAG_UNLOADED
;
575 spin_unlock_irqrestore(ap
->lock
, flags
);
579 * ata_scsi_error - SCSI layer error handler callback
580 * @host: SCSI host on which error occurred
582 * Handles SCSI-layer-thrown error events.
585 * Inherited from SCSI layer (none, can sleep)
590 void ata_scsi_error(struct Scsi_Host
*host
)
592 struct ata_port
*ap
= ata_shost_to_port(host
);
594 LIST_HEAD(eh_work_q
);
598 spin_lock_irqsave(host
->host_lock
, flags
);
599 list_splice_init(&host
->eh_cmd_q
, &eh_work_q
);
600 spin_unlock_irqrestore(host
->host_lock
, flags
);
602 ata_scsi_cmd_error_handler(host
, ap
, &eh_work_q
);
604 /* If we timed raced normal completion and there is nothing to
605 recover nr_timedout == 0 why exactly are we doing error recovery ? */
606 ata_scsi_port_error_handler(host
, ap
);
608 /* finish or retry handled scmd's and clean up */
609 WARN_ON(host
->host_failed
|| !list_empty(&eh_work_q
));
615 * ata_scsi_cmd_error_handler - error callback for a list of commands
616 * @host: scsi host containing the port
617 * @ap: ATA port within the host
618 * @eh_work_q: list of commands to process
620 * process the given list of commands and return those finished to the
621 * ap->eh_done_q. This function is the first part of the libata error
622 * handler which processes a given list of failed commands.
624 void ata_scsi_cmd_error_handler(struct Scsi_Host
*host
, struct ata_port
*ap
,
625 struct list_head
*eh_work_q
)
630 /* make sure sff pio task is not running */
631 ata_sff_flush_pio_task(ap
);
633 /* synchronize with host lock and sort out timeouts */
635 /* For new EH, all qcs are finished in one of three ways -
636 * normal completion, error completion, and SCSI timeout.
637 * Both completions can race against SCSI timeout. When normal
638 * completion wins, the qc never reaches EH. When error
639 * completion wins, the qc has ATA_QCFLAG_FAILED set.
641 * When SCSI timeout wins, things are a bit more complex.
642 * Normal or error completion can occur after the timeout but
643 * before this point. In such cases, both types of
644 * completions are honored. A scmd is determined to have
645 * timed out iff its associated qc is active and not failed.
647 if (ap
->ops
->error_handler
) {
648 struct scsi_cmnd
*scmd
, *tmp
;
651 spin_lock_irqsave(ap
->lock
, flags
);
653 /* This must occur under the ap->lock as we don't want
654 a polled recovery to race the real interrupt handler
656 The lost_interrupt handler checks for any completed but
657 non-notified command and completes much like an IRQ handler.
659 We then fall into the error recovery code which will treat
660 this as if normal completion won the race */
662 if (ap
->ops
->lost_interrupt
)
663 ap
->ops
->lost_interrupt(ap
);
665 list_for_each_entry_safe(scmd
, tmp
, eh_work_q
, eh_entry
) {
666 struct ata_queued_cmd
*qc
;
668 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
669 qc
= __ata_qc_from_tag(ap
, i
);
670 if (qc
->flags
& ATA_QCFLAG_ACTIVE
&&
675 if (i
< ATA_MAX_QUEUE
) {
676 /* the scmd has an associated qc */
677 if (!(qc
->flags
& ATA_QCFLAG_FAILED
)) {
678 /* which hasn't failed yet, timeout */
679 qc
->err_mask
|= AC_ERR_TIMEOUT
;
680 qc
->flags
|= ATA_QCFLAG_FAILED
;
684 /* Normal completion occurred after
685 * SCSI timeout but before this point.
686 * Successfully complete it.
688 scmd
->retries
= scmd
->allowed
;
689 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
693 /* If we have timed out qcs. They belong to EH from
694 * this point but the state of the controller is
695 * unknown. Freeze the port to make sure the IRQ
696 * handler doesn't diddle with those qcs. This must
697 * be done atomically w.r.t. setting QCFLAG_FAILED.
700 __ata_port_freeze(ap
);
702 spin_unlock_irqrestore(ap
->lock
, flags
);
704 /* initialize eh_tries */
705 ap
->eh_tries
= ATA_EH_MAX_TRIES
;
707 spin_unlock_wait(ap
->lock
);
710 EXPORT_SYMBOL(ata_scsi_cmd_error_handler
);
713 * ata_scsi_port_error_handler - recover the port after the commands
714 * @host: SCSI host containing the port
717 * Handle the recovery of the port @ap after all the commands
718 * have been recovered.
720 void ata_scsi_port_error_handler(struct Scsi_Host
*host
, struct ata_port
*ap
)
724 /* invoke error handler */
725 if (ap
->ops
->error_handler
) {
726 struct ata_link
*link
;
728 /* acquire EH ownership */
731 /* kill fast drain timer */
732 del_timer_sync(&ap
->fastdrain_timer
);
734 /* process port resume request */
735 ata_eh_handle_port_resume(ap
);
737 /* fetch & clear EH info */
738 spin_lock_irqsave(ap
->lock
, flags
);
740 ata_for_each_link(link
, ap
, HOST_FIRST
) {
741 struct ata_eh_context
*ehc
= &link
->eh_context
;
742 struct ata_device
*dev
;
744 memset(&link
->eh_context
, 0, sizeof(link
->eh_context
));
745 link
->eh_context
.i
= link
->eh_info
;
746 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
748 ata_for_each_dev(dev
, link
, ENABLED
) {
749 int devno
= dev
->devno
;
751 ehc
->saved_xfer_mode
[devno
] = dev
->xfer_mode
;
752 if (ata_ncq_enabled(dev
))
753 ehc
->saved_ncq_enabled
|= 1 << devno
;
757 ap
->pflags
|= ATA_PFLAG_EH_IN_PROGRESS
;
758 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
759 ap
->excl_link
= NULL
; /* don't maintain exclusion over EH */
761 spin_unlock_irqrestore(ap
->lock
, flags
);
763 /* invoke EH, skip if unloading or suspended */
764 if (!(ap
->pflags
& (ATA_PFLAG_UNLOADING
| ATA_PFLAG_SUSPENDED
)))
765 ap
->ops
->error_handler(ap
);
767 /* if unloading, commence suicide */
768 if ((ap
->pflags
& ATA_PFLAG_UNLOADING
) &&
769 !(ap
->pflags
& ATA_PFLAG_UNLOADED
))
774 /* process port suspend request */
775 ata_eh_handle_port_suspend(ap
);
777 /* Exception might have happened after ->error_handler
778 * recovered the port but before this point. Repeat
781 spin_lock_irqsave(ap
->lock
, flags
);
783 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
) {
784 if (--ap
->eh_tries
) {
785 spin_unlock_irqrestore(ap
->lock
, flags
);
789 "EH pending after %d tries, giving up\n",
791 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
794 /* this run is complete, make sure EH info is clear */
795 ata_for_each_link(link
, ap
, HOST_FIRST
)
796 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
798 /* end eh (clear host_eh_scheduled) while holding
799 * ap->lock such that if exception occurs after this
800 * point but before EH completion, SCSI midlayer will
805 spin_unlock_irqrestore(ap
->lock
, flags
);
808 WARN_ON(ata_qc_from_tag(ap
, ap
->link
.active_tag
) == NULL
);
809 ap
->ops
->eng_timeout(ap
);
812 scsi_eh_flush_done_q(&ap
->eh_done_q
);
815 spin_lock_irqsave(ap
->lock
, flags
);
817 if (ap
->pflags
& ATA_PFLAG_LOADING
)
818 ap
->pflags
&= ~ATA_PFLAG_LOADING
;
819 else if (ap
->pflags
& ATA_PFLAG_SCSI_HOTPLUG
)
820 schedule_delayed_work(&ap
->hotplug_task
, 0);
822 if (ap
->pflags
& ATA_PFLAG_RECOVERED
)
823 ata_port_info(ap
, "EH complete\n");
825 ap
->pflags
&= ~(ATA_PFLAG_SCSI_HOTPLUG
| ATA_PFLAG_RECOVERED
);
827 /* tell wait_eh that we're done */
828 ap
->pflags
&= ~ATA_PFLAG_EH_IN_PROGRESS
;
829 wake_up_all(&ap
->eh_wait_q
);
831 spin_unlock_irqrestore(ap
->lock
, flags
);
833 EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler
);
836 * ata_port_wait_eh - Wait for the currently pending EH to complete
837 * @ap: Port to wait EH for
839 * Wait until the currently pending EH is complete.
842 * Kernel thread context (may sleep).
844 void ata_port_wait_eh(struct ata_port
*ap
)
850 spin_lock_irqsave(ap
->lock
, flags
);
852 while (ap
->pflags
& (ATA_PFLAG_EH_PENDING
| ATA_PFLAG_EH_IN_PROGRESS
)) {
853 prepare_to_wait(&ap
->eh_wait_q
, &wait
, TASK_UNINTERRUPTIBLE
);
854 spin_unlock_irqrestore(ap
->lock
, flags
);
856 spin_lock_irqsave(ap
->lock
, flags
);
858 finish_wait(&ap
->eh_wait_q
, &wait
);
860 spin_unlock_irqrestore(ap
->lock
, flags
);
862 /* make sure SCSI EH is complete */
863 if (scsi_host_in_recovery(ap
->scsi_host
)) {
868 EXPORT_SYMBOL_GPL(ata_port_wait_eh
);
870 static int ata_eh_nr_in_flight(struct ata_port
*ap
)
875 /* count only non-internal commands */
876 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++)
877 if (ata_qc_from_tag(ap
, tag
))
883 void ata_eh_fastdrain_timerfn(unsigned long arg
)
885 struct ata_port
*ap
= (void *)arg
;
889 spin_lock_irqsave(ap
->lock
, flags
);
891 cnt
= ata_eh_nr_in_flight(ap
);
897 if (cnt
== ap
->fastdrain_cnt
) {
900 /* No progress during the last interval, tag all
901 * in-flight qcs as timed out and freeze the port.
903 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++) {
904 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
906 qc
->err_mask
|= AC_ERR_TIMEOUT
;
911 /* some qcs have finished, give it another chance */
912 ap
->fastdrain_cnt
= cnt
;
913 ap
->fastdrain_timer
.expires
=
914 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
915 add_timer(&ap
->fastdrain_timer
);
919 spin_unlock_irqrestore(ap
->lock
, flags
);
923 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
924 * @ap: target ATA port
925 * @fastdrain: activate fast drain
927 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
928 * is non-zero and EH wasn't pending before. Fast drain ensures
929 * that EH kicks in in timely manner.
932 * spin_lock_irqsave(host lock)
934 static void ata_eh_set_pending(struct ata_port
*ap
, int fastdrain
)
938 /* already scheduled? */
939 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
)
942 ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
947 /* do we have in-flight qcs? */
948 cnt
= ata_eh_nr_in_flight(ap
);
952 /* activate fast drain */
953 ap
->fastdrain_cnt
= cnt
;
954 ap
->fastdrain_timer
.expires
=
955 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
956 add_timer(&ap
->fastdrain_timer
);
960 * ata_qc_schedule_eh - schedule qc for error handling
961 * @qc: command to schedule error handling for
963 * Schedule error handling for @qc. EH will kick in as soon as
964 * other commands are drained.
967 * spin_lock_irqsave(host lock)
969 void ata_qc_schedule_eh(struct ata_queued_cmd
*qc
)
971 struct ata_port
*ap
= qc
->ap
;
972 struct request_queue
*q
= qc
->scsicmd
->device
->request_queue
;
975 WARN_ON(!ap
->ops
->error_handler
);
977 qc
->flags
|= ATA_QCFLAG_FAILED
;
978 ata_eh_set_pending(ap
, 1);
980 /* The following will fail if timeout has already expired.
981 * ata_scsi_error() takes care of such scmds on EH entry.
982 * Note that ATA_QCFLAG_FAILED is unconditionally set after
983 * this function completes.
985 spin_lock_irqsave(q
->queue_lock
, flags
);
986 blk_abort_request(qc
->scsicmd
->request
);
987 spin_unlock_irqrestore(q
->queue_lock
, flags
);
991 * ata_std_sched_eh - non-libsas ata_ports issue eh with this common routine
992 * @ap: ATA port to schedule EH for
994 * LOCKING: inherited from ata_port_schedule_eh
995 * spin_lock_irqsave(host lock)
997 void ata_std_sched_eh(struct ata_port
*ap
)
999 WARN_ON(!ap
->ops
->error_handler
);
1001 if (ap
->pflags
& ATA_PFLAG_INITIALIZING
)
1004 ata_eh_set_pending(ap
, 1);
1005 scsi_schedule_eh(ap
->scsi_host
);
1007 DPRINTK("port EH scheduled\n");
1009 EXPORT_SYMBOL_GPL(ata_std_sched_eh
);
1012 * ata_std_end_eh - non-libsas ata_ports complete eh with this common routine
1013 * @ap: ATA port to end EH for
1015 * In the libata object model there is a 1:1 mapping of ata_port to
1016 * shost, so host fields can be directly manipulated under ap->lock, in
1017 * the libsas case we need to hold a lock at the ha->level to coordinate
1021 * spin_lock_irqsave(host lock)
1023 void ata_std_end_eh(struct ata_port
*ap
)
1025 struct Scsi_Host
*host
= ap
->scsi_host
;
1027 host
->host_eh_scheduled
= 0;
1029 EXPORT_SYMBOL(ata_std_end_eh
);
1033 * ata_port_schedule_eh - schedule error handling without a qc
1034 * @ap: ATA port to schedule EH for
1036 * Schedule error handling for @ap. EH will kick in as soon as
1037 * all commands are drained.
1040 * spin_lock_irqsave(host lock)
1042 void ata_port_schedule_eh(struct ata_port
*ap
)
1044 /* see: ata_std_sched_eh, unless you know better */
1045 ap
->ops
->sched_eh(ap
);
1048 static int ata_do_link_abort(struct ata_port
*ap
, struct ata_link
*link
)
1050 int tag
, nr_aborted
= 0;
1052 WARN_ON(!ap
->ops
->error_handler
);
1054 /* we're gonna abort all commands, no need for fast drain */
1055 ata_eh_set_pending(ap
, 0);
1057 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1058 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
1060 if (qc
&& (!link
|| qc
->dev
->link
== link
)) {
1061 qc
->flags
|= ATA_QCFLAG_FAILED
;
1062 ata_qc_complete(qc
);
1068 ata_port_schedule_eh(ap
);
1074 * ata_link_abort - abort all qc's on the link
1075 * @link: ATA link to abort qc's for
1077 * Abort all active qc's active on @link and schedule EH.
1080 * spin_lock_irqsave(host lock)
1083 * Number of aborted qc's.
1085 int ata_link_abort(struct ata_link
*link
)
1087 return ata_do_link_abort(link
->ap
, link
);
1091 * ata_port_abort - abort all qc's on the port
1092 * @ap: ATA port to abort qc's for
1094 * Abort all active qc's of @ap and schedule EH.
1097 * spin_lock_irqsave(host_set lock)
1100 * Number of aborted qc's.
1102 int ata_port_abort(struct ata_port
*ap
)
1104 return ata_do_link_abort(ap
, NULL
);
1108 * __ata_port_freeze - freeze port
1109 * @ap: ATA port to freeze
1111 * This function is called when HSM violation or some other
1112 * condition disrupts normal operation of the port. Frozen port
1113 * is not allowed to perform any operation until the port is
1114 * thawed, which usually follows a successful reset.
1116 * ap->ops->freeze() callback can be used for freezing the port
1117 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1118 * port cannot be frozen hardware-wise, the interrupt handler
1119 * must ack and clear interrupts unconditionally while the port
1123 * spin_lock_irqsave(host lock)
1125 static void __ata_port_freeze(struct ata_port
*ap
)
1127 WARN_ON(!ap
->ops
->error_handler
);
1129 if (ap
->ops
->freeze
)
1130 ap
->ops
->freeze(ap
);
1132 ap
->pflags
|= ATA_PFLAG_FROZEN
;
1134 DPRINTK("ata%u port frozen\n", ap
->print_id
);
1138 * ata_port_freeze - abort & freeze port
1139 * @ap: ATA port to freeze
1141 * Abort and freeze @ap. The freeze operation must be called
1142 * first, because some hardware requires special operations
1143 * before the taskfile registers are accessible.
1146 * spin_lock_irqsave(host lock)
1149 * Number of aborted commands.
1151 int ata_port_freeze(struct ata_port
*ap
)
1155 WARN_ON(!ap
->ops
->error_handler
);
1157 __ata_port_freeze(ap
);
1158 nr_aborted
= ata_port_abort(ap
);
1164 * sata_async_notification - SATA async notification handler
1165 * @ap: ATA port where async notification is received
1167 * Handler to be called when async notification via SDB FIS is
1168 * received. This function schedules EH if necessary.
1171 * spin_lock_irqsave(host lock)
1174 * 1 if EH is scheduled, 0 otherwise.
1176 int sata_async_notification(struct ata_port
*ap
)
1181 if (!(ap
->flags
& ATA_FLAG_AN
))
1184 rc
= sata_scr_read(&ap
->link
, SCR_NOTIFICATION
, &sntf
);
1186 sata_scr_write(&ap
->link
, SCR_NOTIFICATION
, sntf
);
1188 if (!sata_pmp_attached(ap
) || rc
) {
1189 /* PMP is not attached or SNTF is not available */
1190 if (!sata_pmp_attached(ap
)) {
1191 /* PMP is not attached. Check whether ATAPI
1192 * AN is configured. If so, notify media
1195 struct ata_device
*dev
= ap
->link
.device
;
1197 if ((dev
->class == ATA_DEV_ATAPI
) &&
1198 (dev
->flags
& ATA_DFLAG_AN
))
1199 ata_scsi_media_change_notify(dev
);
1202 /* PMP is attached but SNTF is not available.
1203 * ATAPI async media change notification is
1204 * not used. The PMP must be reporting PHY
1205 * status change, schedule EH.
1207 ata_port_schedule_eh(ap
);
1211 /* PMP is attached and SNTF is available */
1212 struct ata_link
*link
;
1214 /* check and notify ATAPI AN */
1215 ata_for_each_link(link
, ap
, EDGE
) {
1216 if (!(sntf
& (1 << link
->pmp
)))
1219 if ((link
->device
->class == ATA_DEV_ATAPI
) &&
1220 (link
->device
->flags
& ATA_DFLAG_AN
))
1221 ata_scsi_media_change_notify(link
->device
);
1224 /* If PMP is reporting that PHY status of some
1225 * downstream ports has changed, schedule EH.
1227 if (sntf
& (1 << SATA_PMP_CTRL_PORT
)) {
1228 ata_port_schedule_eh(ap
);
1237 * ata_eh_freeze_port - EH helper to freeze port
1238 * @ap: ATA port to freeze
1245 void ata_eh_freeze_port(struct ata_port
*ap
)
1247 unsigned long flags
;
1249 if (!ap
->ops
->error_handler
)
1252 spin_lock_irqsave(ap
->lock
, flags
);
1253 __ata_port_freeze(ap
);
1254 spin_unlock_irqrestore(ap
->lock
, flags
);
1258 * ata_port_thaw_port - EH helper to thaw port
1259 * @ap: ATA port to thaw
1261 * Thaw frozen port @ap.
1266 void ata_eh_thaw_port(struct ata_port
*ap
)
1268 unsigned long flags
;
1270 if (!ap
->ops
->error_handler
)
1273 spin_lock_irqsave(ap
->lock
, flags
);
1275 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
1280 spin_unlock_irqrestore(ap
->lock
, flags
);
1282 DPRINTK("ata%u port thawed\n", ap
->print_id
);
1285 static void ata_eh_scsidone(struct scsi_cmnd
*scmd
)
1290 static void __ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1292 struct ata_port
*ap
= qc
->ap
;
1293 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1294 unsigned long flags
;
1296 spin_lock_irqsave(ap
->lock
, flags
);
1297 qc
->scsidone
= ata_eh_scsidone
;
1298 __ata_qc_complete(qc
);
1299 WARN_ON(ata_tag_valid(qc
->tag
));
1300 spin_unlock_irqrestore(ap
->lock
, flags
);
1302 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
1306 * ata_eh_qc_complete - Complete an active ATA command from EH
1307 * @qc: Command to complete
1309 * Indicate to the mid and upper layers that an ATA command has
1310 * completed. To be used from EH.
1312 void ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1314 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1315 scmd
->retries
= scmd
->allowed
;
1316 __ata_eh_qc_complete(qc
);
1320 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1321 * @qc: Command to retry
1323 * Indicate to the mid and upper layers that an ATA command
1324 * should be retried. To be used from EH.
1326 * SCSI midlayer limits the number of retries to scmd->allowed.
1327 * scmd->allowed is incremented for commands which get retried
1328 * due to unrelated failures (qc->err_mask is zero).
1330 void ata_eh_qc_retry(struct ata_queued_cmd
*qc
)
1332 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1335 __ata_eh_qc_complete(qc
);
1339 * ata_dev_disable - disable ATA device
1340 * @dev: ATA device to disable
1347 void ata_dev_disable(struct ata_device
*dev
)
1349 if (!ata_dev_enabled(dev
))
1352 if (ata_msg_drv(dev
->link
->ap
))
1353 ata_dev_warn(dev
, "disabled\n");
1354 ata_acpi_on_disable(dev
);
1355 ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO0
| ATA_DNXFER_QUIET
);
1358 /* From now till the next successful probe, ering is used to
1359 * track probe failures. Clear accumulated device error info.
1361 ata_ering_clear(&dev
->ering
);
1365 * ata_eh_detach_dev - detach ATA device
1366 * @dev: ATA device to detach
1373 void ata_eh_detach_dev(struct ata_device
*dev
)
1375 struct ata_link
*link
= dev
->link
;
1376 struct ata_port
*ap
= link
->ap
;
1377 struct ata_eh_context
*ehc
= &link
->eh_context
;
1378 unsigned long flags
;
1380 ata_dev_disable(dev
);
1382 spin_lock_irqsave(ap
->lock
, flags
);
1384 dev
->flags
&= ~ATA_DFLAG_DETACH
;
1386 if (ata_scsi_offline_dev(dev
)) {
1387 dev
->flags
|= ATA_DFLAG_DETACHED
;
1388 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
1391 /* clear per-dev EH info */
1392 ata_eh_clear_action(link
, dev
, &link
->eh_info
, ATA_EH_PERDEV_MASK
);
1393 ata_eh_clear_action(link
, dev
, &link
->eh_context
.i
, ATA_EH_PERDEV_MASK
);
1394 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
1395 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
1397 spin_unlock_irqrestore(ap
->lock
, flags
);
1401 * ata_eh_about_to_do - about to perform eh_action
1402 * @link: target ATA link
1403 * @dev: target ATA dev for per-dev action (can be NULL)
1404 * @action: action about to be performed
1406 * Called just before performing EH actions to clear related bits
1407 * in @link->eh_info such that eh actions are not unnecessarily
1413 void ata_eh_about_to_do(struct ata_link
*link
, struct ata_device
*dev
,
1414 unsigned int action
)
1416 struct ata_port
*ap
= link
->ap
;
1417 struct ata_eh_info
*ehi
= &link
->eh_info
;
1418 struct ata_eh_context
*ehc
= &link
->eh_context
;
1419 unsigned long flags
;
1421 spin_lock_irqsave(ap
->lock
, flags
);
1423 ata_eh_clear_action(link
, dev
, ehi
, action
);
1425 /* About to take EH action, set RECOVERED. Ignore actions on
1426 * slave links as master will do them again.
1428 if (!(ehc
->i
.flags
& ATA_EHI_QUIET
) && link
!= ap
->slave_link
)
1429 ap
->pflags
|= ATA_PFLAG_RECOVERED
;
1431 spin_unlock_irqrestore(ap
->lock
, flags
);
1435 * ata_eh_done - EH action complete
1436 * @ap: target ATA port
1437 * @dev: target ATA dev for per-dev action (can be NULL)
1438 * @action: action just completed
1440 * Called right after performing EH actions to clear related bits
1441 * in @link->eh_context.
1446 void ata_eh_done(struct ata_link
*link
, struct ata_device
*dev
,
1447 unsigned int action
)
1449 struct ata_eh_context
*ehc
= &link
->eh_context
;
1451 ata_eh_clear_action(link
, dev
, &ehc
->i
, action
);
1455 * ata_err_string - convert err_mask to descriptive string
1456 * @err_mask: error mask to convert to string
1458 * Convert @err_mask to descriptive string. Errors are
1459 * prioritized according to severity and only the most severe
1460 * error is reported.
1466 * Descriptive string for @err_mask
1468 static const char *ata_err_string(unsigned int err_mask
)
1470 if (err_mask
& AC_ERR_HOST_BUS
)
1471 return "host bus error";
1472 if (err_mask
& AC_ERR_ATA_BUS
)
1473 return "ATA bus error";
1474 if (err_mask
& AC_ERR_TIMEOUT
)
1476 if (err_mask
& AC_ERR_HSM
)
1477 return "HSM violation";
1478 if (err_mask
& AC_ERR_SYSTEM
)
1479 return "internal error";
1480 if (err_mask
& AC_ERR_MEDIA
)
1481 return "media error";
1482 if (err_mask
& AC_ERR_INVALID
)
1483 return "invalid argument";
1484 if (err_mask
& AC_ERR_DEV
)
1485 return "device error";
1486 return "unknown error";
1490 * ata_read_log_page - read a specific log page
1491 * @dev: target device
1493 * @page: page to read
1494 * @buf: buffer to store read page
1495 * @sectors: number of sectors to read
1497 * Read log page using READ_LOG_EXT command.
1500 * Kernel thread context (may sleep).
1503 * 0 on success, AC_ERR_* mask otherwise.
1505 unsigned int ata_read_log_page(struct ata_device
*dev
, u8 log
,
1506 u8 page
, void *buf
, unsigned int sectors
)
1508 struct ata_taskfile tf
;
1509 unsigned int err_mask
;
1512 DPRINTK("read log page - log 0x%x, page 0x%x\n", log
, page
);
1515 ata_tf_init(dev
, &tf
);
1516 if (dev
->dma_mode
&& ata_id_has_read_log_dma_ext(dev
->id
) &&
1517 !(dev
->horkage
& ATA_HORKAGE_NO_NCQ_LOG
)) {
1518 tf
.command
= ATA_CMD_READ_LOG_DMA_EXT
;
1519 tf
.protocol
= ATA_PROT_DMA
;
1522 tf
.command
= ATA_CMD_READ_LOG_EXT
;
1523 tf
.protocol
= ATA_PROT_PIO
;
1529 tf
.hob_nsect
= sectors
>> 8;
1530 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA48
| ATA_TFLAG_DEVICE
;
1532 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1533 buf
, sectors
* ATA_SECT_SIZE
, 0);
1535 if (err_mask
&& dma
) {
1536 dev
->horkage
|= ATA_HORKAGE_NO_NCQ_LOG
;
1537 ata_dev_warn(dev
, "READ LOG DMA EXT failed, trying unqueued\n");
1541 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
1546 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1547 * @dev: Device to read log page 10h from
1548 * @tag: Resulting tag of the failed command
1549 * @tf: Resulting taskfile registers of the failed command
1551 * Read log page 10h to obtain NCQ error details and clear error
1555 * Kernel thread context (may sleep).
1558 * 0 on success, -errno otherwise.
1560 static int ata_eh_read_log_10h(struct ata_device
*dev
,
1561 int *tag
, struct ata_taskfile
*tf
)
1563 u8
*buf
= dev
->link
->ap
->sector_buf
;
1564 unsigned int err_mask
;
1568 err_mask
= ata_read_log_page(dev
, ATA_LOG_SATA_NCQ
, 0, buf
, 1);
1573 for (i
= 0; i
< ATA_SECT_SIZE
; i
++)
1576 ata_dev_warn(dev
, "invalid checksum 0x%x on log page 10h\n",
1582 *tag
= buf
[0] & 0x1f;
1584 tf
->command
= buf
[2];
1585 tf
->feature
= buf
[3];
1589 tf
->device
= buf
[7];
1590 tf
->hob_lbal
= buf
[8];
1591 tf
->hob_lbam
= buf
[9];
1592 tf
->hob_lbah
= buf
[10];
1593 tf
->nsect
= buf
[12];
1594 tf
->hob_nsect
= buf
[13];
1595 if (ata_id_has_ncq_autosense(dev
->id
))
1596 tf
->auxiliary
= buf
[14] << 16 | buf
[15] << 8 | buf
[16];
1602 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1603 * @dev: target ATAPI device
1604 * @r_sense_key: out parameter for sense_key
1606 * Perform ATAPI TEST_UNIT_READY.
1609 * EH context (may sleep).
1612 * 0 on success, AC_ERR_* mask on failure.
1614 unsigned int atapi_eh_tur(struct ata_device
*dev
, u8
*r_sense_key
)
1616 u8 cdb
[ATAPI_CDB_LEN
] = { TEST_UNIT_READY
, 0, 0, 0, 0, 0 };
1617 struct ata_taskfile tf
;
1618 unsigned int err_mask
;
1620 ata_tf_init(dev
, &tf
);
1622 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1623 tf
.command
= ATA_CMD_PACKET
;
1624 tf
.protocol
= ATAPI_PROT_NODATA
;
1626 err_mask
= ata_exec_internal(dev
, &tf
, cdb
, DMA_NONE
, NULL
, 0, 0);
1627 if (err_mask
== AC_ERR_DEV
)
1628 *r_sense_key
= tf
.feature
>> 4;
1633 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1634 * @dev: device to perform REQUEST_SENSE to
1635 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1636 * @dfl_sense_key: default sense key to use
1638 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1639 * SENSE. This function is EH helper.
1642 * Kernel thread context (may sleep).
1645 * 0 on success, AC_ERR_* mask on failure
1647 unsigned int atapi_eh_request_sense(struct ata_device
*dev
,
1648 u8
*sense_buf
, u8 dfl_sense_key
)
1650 u8 cdb
[ATAPI_CDB_LEN
] =
1651 { REQUEST_SENSE
, 0, 0, 0, SCSI_SENSE_BUFFERSIZE
, 0 };
1652 struct ata_port
*ap
= dev
->link
->ap
;
1653 struct ata_taskfile tf
;
1655 DPRINTK("ATAPI request sense\n");
1657 memset(sense_buf
, 0, SCSI_SENSE_BUFFERSIZE
);
1659 /* initialize sense_buf with the error register,
1660 * for the case where they are -not- overwritten
1662 sense_buf
[0] = 0x70;
1663 sense_buf
[2] = dfl_sense_key
;
1665 /* some devices time out if garbage left in tf */
1666 ata_tf_init(dev
, &tf
);
1668 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1669 tf
.command
= ATA_CMD_PACKET
;
1671 /* is it pointless to prefer PIO for "safety reasons"? */
1672 if (ap
->flags
& ATA_FLAG_PIO_DMA
) {
1673 tf
.protocol
= ATAPI_PROT_DMA
;
1674 tf
.feature
|= ATAPI_PKT_DMA
;
1676 tf
.protocol
= ATAPI_PROT_PIO
;
1677 tf
.lbam
= SCSI_SENSE_BUFFERSIZE
;
1681 return ata_exec_internal(dev
, &tf
, cdb
, DMA_FROM_DEVICE
,
1682 sense_buf
, SCSI_SENSE_BUFFERSIZE
, 0);
1686 * ata_eh_analyze_serror - analyze SError for a failed port
1687 * @link: ATA link to analyze SError for
1689 * Analyze SError if available and further determine cause of
1695 static void ata_eh_analyze_serror(struct ata_link
*link
)
1697 struct ata_eh_context
*ehc
= &link
->eh_context
;
1698 u32 serror
= ehc
->i
.serror
;
1699 unsigned int err_mask
= 0, action
= 0;
1702 if (serror
& (SERR_PERSISTENT
| SERR_DATA
)) {
1703 err_mask
|= AC_ERR_ATA_BUS
;
1704 action
|= ATA_EH_RESET
;
1706 if (serror
& SERR_PROTOCOL
) {
1707 err_mask
|= AC_ERR_HSM
;
1708 action
|= ATA_EH_RESET
;
1710 if (serror
& SERR_INTERNAL
) {
1711 err_mask
|= AC_ERR_SYSTEM
;
1712 action
|= ATA_EH_RESET
;
1715 /* Determine whether a hotplug event has occurred. Both
1716 * SError.N/X are considered hotplug events for enabled or
1717 * host links. For disabled PMP links, only N bit is
1718 * considered as X bit is left at 1 for link plugging.
1720 if (link
->lpm_policy
> ATA_LPM_MAX_POWER
)
1721 hotplug_mask
= 0; /* hotplug doesn't work w/ LPM */
1722 else if (!(link
->flags
& ATA_LFLAG_DISABLED
) || ata_is_host_link(link
))
1723 hotplug_mask
= SERR_PHYRDY_CHG
| SERR_DEV_XCHG
;
1725 hotplug_mask
= SERR_PHYRDY_CHG
;
1727 if (serror
& hotplug_mask
)
1728 ata_ehi_hotplugged(&ehc
->i
);
1730 ehc
->i
.err_mask
|= err_mask
;
1731 ehc
->i
.action
|= action
;
1735 * ata_eh_analyze_ncq_error - analyze NCQ error
1736 * @link: ATA link to analyze NCQ error for
1738 * Read log page 10h, determine the offending qc and acquire
1739 * error status TF. For NCQ device errors, all LLDDs have to do
1740 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1744 * Kernel thread context (may sleep).
1746 void ata_eh_analyze_ncq_error(struct ata_link
*link
)
1748 struct ata_port
*ap
= link
->ap
;
1749 struct ata_eh_context
*ehc
= &link
->eh_context
;
1750 struct ata_device
*dev
= link
->device
;
1751 struct ata_queued_cmd
*qc
;
1752 struct ata_taskfile tf
;
1755 /* if frozen, we can't do much */
1756 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1759 /* is it NCQ device error? */
1760 if (!link
->sactive
|| !(ehc
->i
.err_mask
& AC_ERR_DEV
))
1763 /* has LLDD analyzed already? */
1764 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1765 qc
= __ata_qc_from_tag(ap
, tag
);
1767 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1774 /* okay, this error is ours */
1775 memset(&tf
, 0, sizeof(tf
));
1776 rc
= ata_eh_read_log_10h(dev
, &tag
, &tf
);
1778 ata_link_err(link
, "failed to read log page 10h (errno=%d)\n",
1783 if (!(link
->sactive
& (1 << tag
))) {
1784 ata_link_err(link
, "log page 10h reported inactive tag %d\n",
1789 /* we've got the perpetrator, condemn it */
1790 qc
= __ata_qc_from_tag(ap
, tag
);
1791 memcpy(&qc
->result_tf
, &tf
, sizeof(tf
));
1792 qc
->result_tf
.flags
= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA
| ATA_TFLAG_LBA48
;
1793 qc
->err_mask
|= AC_ERR_DEV
| AC_ERR_NCQ
;
1794 if (qc
->result_tf
.auxiliary
) {
1795 char sense_key
, asc
, ascq
;
1797 sense_key
= (qc
->result_tf
.auxiliary
>> 16) & 0xff;
1798 asc
= (qc
->result_tf
.auxiliary
>> 8) & 0xff;
1799 ascq
= qc
->result_tf
.auxiliary
& 0xff;
1800 ata_dev_dbg(dev
, "NCQ Autosense %02x/%02x/%02x\n",
1801 sense_key
, asc
, ascq
);
1802 ata_scsi_set_sense(qc
->scsicmd
, sense_key
, asc
, ascq
);
1803 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1806 ehc
->i
.err_mask
&= ~AC_ERR_DEV
;
1810 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1811 * @qc: qc to analyze
1812 * @tf: Taskfile registers to analyze
1814 * Analyze taskfile of @qc and further determine cause of
1815 * failure. This function also requests ATAPI sense data if
1819 * Kernel thread context (may sleep).
1822 * Determined recovery action
1824 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd
*qc
,
1825 const struct ata_taskfile
*tf
)
1827 unsigned int tmp
, action
= 0;
1828 u8 stat
= tf
->command
, err
= tf
->feature
;
1830 if ((stat
& (ATA_BUSY
| ATA_DRQ
| ATA_DRDY
)) != ATA_DRDY
) {
1831 qc
->err_mask
|= AC_ERR_HSM
;
1832 return ATA_EH_RESET
;
1835 /* Set by NCQ autosense */
1836 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
1839 if (stat
& (ATA_ERR
| ATA_DF
))
1840 qc
->err_mask
|= AC_ERR_DEV
;
1844 switch (qc
->dev
->class) {
1848 qc
->err_mask
|= AC_ERR_ATA_BUS
;
1849 if (err
& (ATA_UNC
| ATA_AMNF
))
1850 qc
->err_mask
|= AC_ERR_MEDIA
;
1852 qc
->err_mask
|= AC_ERR_INVALID
;
1856 if (!(qc
->ap
->pflags
& ATA_PFLAG_FROZEN
)) {
1857 tmp
= atapi_eh_request_sense(qc
->dev
,
1858 qc
->scsicmd
->sense_buffer
,
1859 qc
->result_tf
.feature
>> 4);
1861 /* ATA_QCFLAG_SENSE_VALID is used to
1862 * tell atapi_qc_complete() that sense
1863 * data is already valid.
1865 * TODO: interpret sense data and set
1866 * appropriate err_mask.
1868 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1870 qc
->err_mask
|= tmp
;
1874 if (qc
->err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
| AC_ERR_ATA_BUS
))
1875 action
|= ATA_EH_RESET
;
1880 static int ata_eh_categorize_error(unsigned int eflags
, unsigned int err_mask
,
1885 if (!(eflags
& ATA_EFLAG_DUBIOUS_XFER
))
1889 base
= ATA_ECAT_DUBIOUS_NONE
;
1891 if (err_mask
& AC_ERR_ATA_BUS
)
1892 return base
+ ATA_ECAT_ATA_BUS
;
1894 if (err_mask
& AC_ERR_TIMEOUT
)
1895 return base
+ ATA_ECAT_TOUT_HSM
;
1897 if (eflags
& ATA_EFLAG_IS_IO
) {
1898 if (err_mask
& AC_ERR_HSM
)
1899 return base
+ ATA_ECAT_TOUT_HSM
;
1901 (AC_ERR_DEV
|AC_ERR_MEDIA
|AC_ERR_INVALID
)) == AC_ERR_DEV
)
1902 return base
+ ATA_ECAT_UNK_DEV
;
1908 struct speed_down_verdict_arg
{
1911 int nr_errors
[ATA_ECAT_NR
];
1914 static int speed_down_verdict_cb(struct ata_ering_entry
*ent
, void *void_arg
)
1916 struct speed_down_verdict_arg
*arg
= void_arg
;
1919 if ((ent
->eflags
& ATA_EFLAG_OLD_ER
) || (ent
->timestamp
< arg
->since
))
1922 cat
= ata_eh_categorize_error(ent
->eflags
, ent
->err_mask
,
1924 arg
->nr_errors
[cat
]++;
1930 * ata_eh_speed_down_verdict - Determine speed down verdict
1931 * @dev: Device of interest
1933 * This function examines error ring of @dev and determines
1934 * whether NCQ needs to be turned off, transfer speed should be
1935 * stepped down, or falling back to PIO is necessary.
1937 * ECAT_ATA_BUS : ATA_BUS error for any command
1939 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1942 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1944 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1945 * data transfer hasn't been verified.
1949 * NCQ_OFF : Turn off NCQ.
1951 * SPEED_DOWN : Speed down transfer speed but don't fall back
1954 * FALLBACK_TO_PIO : Fall back to PIO.
1956 * Even if multiple verdicts are returned, only one action is
1957 * taken per error. An action triggered by non-DUBIOUS errors
1958 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1959 * This is to expedite speed down decisions right after device is
1960 * initially configured.
1962 * The followings are speed down rules. #1 and #2 deal with
1965 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1966 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1968 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1969 * occurred during last 5 mins, NCQ_OFF.
1971 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1972 * occurred during last 5 mins, FALLBACK_TO_PIO
1974 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1975 * during last 10 mins, NCQ_OFF.
1977 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1978 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1981 * Inherited from caller.
1984 * OR of ATA_EH_SPDN_* flags.
1986 static unsigned int ata_eh_speed_down_verdict(struct ata_device
*dev
)
1988 const u64 j5mins
= 5LLU * 60 * HZ
, j10mins
= 10LLU * 60 * HZ
;
1989 u64 j64
= get_jiffies_64();
1990 struct speed_down_verdict_arg arg
;
1991 unsigned int verdict
= 0;
1993 /* scan past 5 mins of error history */
1994 memset(&arg
, 0, sizeof(arg
));
1995 arg
.since
= j64
- min(j64
, j5mins
);
1996 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1998 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_ATA_BUS
] +
1999 arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] > 1)
2000 verdict
|= ATA_EH_SPDN_SPEED_DOWN
|
2001 ATA_EH_SPDN_FALLBACK_TO_PIO
| ATA_EH_SPDN_KEEP_ERRORS
;
2003 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] +
2004 arg
.nr_errors
[ATA_ECAT_DUBIOUS_UNK_DEV
] > 1)
2005 verdict
|= ATA_EH_SPDN_NCQ_OFF
| ATA_EH_SPDN_KEEP_ERRORS
;
2007 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
2008 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
2009 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
2010 verdict
|= ATA_EH_SPDN_FALLBACK_TO_PIO
;
2012 /* scan past 10 mins of error history */
2013 memset(&arg
, 0, sizeof(arg
));
2014 arg
.since
= j64
- min(j64
, j10mins
);
2015 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
2017 if (arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
2018 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 3)
2019 verdict
|= ATA_EH_SPDN_NCQ_OFF
;
2021 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
2022 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] > 3 ||
2023 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
2024 verdict
|= ATA_EH_SPDN_SPEED_DOWN
;
2030 * ata_eh_speed_down - record error and speed down if necessary
2031 * @dev: Failed device
2032 * @eflags: mask of ATA_EFLAG_* flags
2033 * @err_mask: err_mask of the error
2035 * Record error and examine error history to determine whether
2036 * adjusting transmission speed is necessary. It also sets
2037 * transmission limits appropriately if such adjustment is
2041 * Kernel thread context (may sleep).
2044 * Determined recovery action.
2046 static unsigned int ata_eh_speed_down(struct ata_device
*dev
,
2047 unsigned int eflags
, unsigned int err_mask
)
2049 struct ata_link
*link
= ata_dev_phys_link(dev
);
2051 unsigned int verdict
;
2052 unsigned int action
= 0;
2054 /* don't bother if Cat-0 error */
2055 if (ata_eh_categorize_error(eflags
, err_mask
, &xfer_ok
) == 0)
2058 /* record error and determine whether speed down is necessary */
2059 ata_ering_record(&dev
->ering
, eflags
, err_mask
);
2060 verdict
= ata_eh_speed_down_verdict(dev
);
2063 if ((verdict
& ATA_EH_SPDN_NCQ_OFF
) &&
2064 (dev
->flags
& (ATA_DFLAG_PIO
| ATA_DFLAG_NCQ
|
2065 ATA_DFLAG_NCQ_OFF
)) == ATA_DFLAG_NCQ
) {
2066 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
2067 ata_dev_warn(dev
, "NCQ disabled due to excessive errors\n");
2072 if (verdict
& ATA_EH_SPDN_SPEED_DOWN
) {
2073 /* speed down SATA link speed if possible */
2074 if (sata_down_spd_limit(link
, 0) == 0) {
2075 action
|= ATA_EH_RESET
;
2079 /* lower transfer mode */
2080 if (dev
->spdn_cnt
< 2) {
2081 static const int dma_dnxfer_sel
[] =
2082 { ATA_DNXFER_DMA
, ATA_DNXFER_40C
};
2083 static const int pio_dnxfer_sel
[] =
2084 { ATA_DNXFER_PIO
, ATA_DNXFER_FORCE_PIO0
};
2087 if (dev
->xfer_shift
!= ATA_SHIFT_PIO
)
2088 sel
= dma_dnxfer_sel
[dev
->spdn_cnt
];
2090 sel
= pio_dnxfer_sel
[dev
->spdn_cnt
];
2094 if (ata_down_xfermask_limit(dev
, sel
) == 0) {
2095 action
|= ATA_EH_RESET
;
2101 /* Fall back to PIO? Slowing down to PIO is meaningless for
2102 * SATA ATA devices. Consider it only for PATA and SATAPI.
2104 if ((verdict
& ATA_EH_SPDN_FALLBACK_TO_PIO
) && (dev
->spdn_cnt
>= 2) &&
2105 (link
->ap
->cbl
!= ATA_CBL_SATA
|| dev
->class == ATA_DEV_ATAPI
) &&
2106 (dev
->xfer_shift
!= ATA_SHIFT_PIO
)) {
2107 if (ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO
) == 0) {
2109 action
|= ATA_EH_RESET
;
2116 /* device has been slowed down, blow error history */
2117 if (!(verdict
& ATA_EH_SPDN_KEEP_ERRORS
))
2118 ata_ering_clear(&dev
->ering
);
2123 * ata_eh_worth_retry - analyze error and decide whether to retry
2124 * @qc: qc to possibly retry
2126 * Look at the cause of the error and decide if a retry
2127 * might be useful or not. We don't want to retry media errors
2128 * because the drive itself has probably already taken 10-30 seconds
2129 * doing its own internal retries before reporting the failure.
2131 static inline int ata_eh_worth_retry(struct ata_queued_cmd
*qc
)
2133 if (qc
->err_mask
& AC_ERR_MEDIA
)
2134 return 0; /* don't retry media errors */
2135 if (qc
->flags
& ATA_QCFLAG_IO
)
2136 return 1; /* otherwise retry anything from fs stack */
2137 if (qc
->err_mask
& AC_ERR_INVALID
)
2138 return 0; /* don't retry these */
2139 return qc
->err_mask
!= AC_ERR_DEV
; /* retry if not dev error */
2143 * ata_eh_link_autopsy - analyze error and determine recovery action
2144 * @link: host link to perform autopsy on
2146 * Analyze why @link failed and determine which recovery actions
2147 * are needed. This function also sets more detailed AC_ERR_*
2148 * values and fills sense data for ATAPI CHECK SENSE.
2151 * Kernel thread context (may sleep).
2153 static void ata_eh_link_autopsy(struct ata_link
*link
)
2155 struct ata_port
*ap
= link
->ap
;
2156 struct ata_eh_context
*ehc
= &link
->eh_context
;
2157 struct ata_device
*dev
;
2158 unsigned int all_err_mask
= 0, eflags
= 0;
2165 if (ehc
->i
.flags
& ATA_EHI_NO_AUTOPSY
)
2168 /* obtain and analyze SError */
2169 rc
= sata_scr_read(link
, SCR_ERROR
, &serror
);
2171 ehc
->i
.serror
|= serror
;
2172 ata_eh_analyze_serror(link
);
2173 } else if (rc
!= -EOPNOTSUPP
) {
2174 /* SError read failed, force reset and probing */
2175 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
2176 ehc
->i
.action
|= ATA_EH_RESET
;
2177 ehc
->i
.err_mask
|= AC_ERR_OTHER
;
2180 /* analyze NCQ failure */
2181 ata_eh_analyze_ncq_error(link
);
2183 /* any real error trumps AC_ERR_OTHER */
2184 if (ehc
->i
.err_mask
& ~AC_ERR_OTHER
)
2185 ehc
->i
.err_mask
&= ~AC_ERR_OTHER
;
2187 all_err_mask
|= ehc
->i
.err_mask
;
2189 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2190 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2192 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2193 ata_dev_phys_link(qc
->dev
) != link
)
2196 /* inherit upper level err_mask */
2197 qc
->err_mask
|= ehc
->i
.err_mask
;
2200 ehc
->i
.action
|= ata_eh_analyze_tf(qc
, &qc
->result_tf
);
2202 /* DEV errors are probably spurious in case of ATA_BUS error */
2203 if (qc
->err_mask
& AC_ERR_ATA_BUS
)
2204 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_MEDIA
|
2207 /* any real error trumps unknown error */
2208 if (qc
->err_mask
& ~AC_ERR_OTHER
)
2209 qc
->err_mask
&= ~AC_ERR_OTHER
;
2211 /* SENSE_VALID trumps dev/unknown error and revalidation */
2212 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
2213 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_OTHER
);
2215 /* determine whether the command is worth retrying */
2216 if (ata_eh_worth_retry(qc
))
2217 qc
->flags
|= ATA_QCFLAG_RETRY
;
2219 /* accumulate error info */
2220 ehc
->i
.dev
= qc
->dev
;
2221 all_err_mask
|= qc
->err_mask
;
2222 if (qc
->flags
& ATA_QCFLAG_IO
)
2223 eflags
|= ATA_EFLAG_IS_IO
;
2224 trace_ata_eh_link_autopsy_qc(qc
);
2227 /* enforce default EH actions */
2228 if (ap
->pflags
& ATA_PFLAG_FROZEN
||
2229 all_err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
))
2230 ehc
->i
.action
|= ATA_EH_RESET
;
2231 else if (((eflags
& ATA_EFLAG_IS_IO
) && all_err_mask
) ||
2232 (!(eflags
& ATA_EFLAG_IS_IO
) && (all_err_mask
& ~AC_ERR_DEV
)))
2233 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2235 /* If we have offending qcs and the associated failed device,
2236 * perform per-dev EH action only on the offending device.
2239 ehc
->i
.dev_action
[ehc
->i
.dev
->devno
] |=
2240 ehc
->i
.action
& ATA_EH_PERDEV_MASK
;
2241 ehc
->i
.action
&= ~ATA_EH_PERDEV_MASK
;
2244 /* propagate timeout to host link */
2245 if ((all_err_mask
& AC_ERR_TIMEOUT
) && !ata_is_host_link(link
))
2246 ap
->link
.eh_context
.i
.err_mask
|= AC_ERR_TIMEOUT
;
2248 /* record error and consider speeding down */
2250 if (!dev
&& ((ata_link_max_devices(link
) == 1 &&
2251 ata_dev_enabled(link
->device
))))
2255 if (dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)
2256 eflags
|= ATA_EFLAG_DUBIOUS_XFER
;
2257 ehc
->i
.action
|= ata_eh_speed_down(dev
, eflags
, all_err_mask
);
2259 trace_ata_eh_link_autopsy(dev
, ehc
->i
.action
, all_err_mask
);
2264 * ata_eh_autopsy - analyze error and determine recovery action
2265 * @ap: host port to perform autopsy on
2267 * Analyze all links of @ap and determine why they failed and
2268 * which recovery actions are needed.
2271 * Kernel thread context (may sleep).
2273 void ata_eh_autopsy(struct ata_port
*ap
)
2275 struct ata_link
*link
;
2277 ata_for_each_link(link
, ap
, EDGE
)
2278 ata_eh_link_autopsy(link
);
2280 /* Handle the frigging slave link. Autopsy is done similarly
2281 * but actions and flags are transferred over to the master
2282 * link and handled from there.
2284 if (ap
->slave_link
) {
2285 struct ata_eh_context
*mehc
= &ap
->link
.eh_context
;
2286 struct ata_eh_context
*sehc
= &ap
->slave_link
->eh_context
;
2288 /* transfer control flags from master to slave */
2289 sehc
->i
.flags
|= mehc
->i
.flags
& ATA_EHI_TO_SLAVE_MASK
;
2291 /* perform autopsy on the slave link */
2292 ata_eh_link_autopsy(ap
->slave_link
);
2294 /* transfer actions from slave to master and clear slave */
2295 ata_eh_about_to_do(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2296 mehc
->i
.action
|= sehc
->i
.action
;
2297 mehc
->i
.dev_action
[1] |= sehc
->i
.dev_action
[1];
2298 mehc
->i
.flags
|= sehc
->i
.flags
;
2299 ata_eh_done(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2302 /* Autopsy of fanout ports can affect host link autopsy.
2303 * Perform host link autopsy last.
2305 if (sata_pmp_attached(ap
))
2306 ata_eh_link_autopsy(&ap
->link
);
2310 * ata_get_cmd_descript - get description for ATA command
2311 * @command: ATA command code to get description for
2313 * Return a textual description of the given command, or NULL if the
2314 * command is not known.
2319 const char *ata_get_cmd_descript(u8 command
)
2321 #ifdef CONFIG_ATA_VERBOSE_ERROR
2327 { ATA_CMD_DEV_RESET
, "DEVICE RESET" },
2328 { ATA_CMD_CHK_POWER
, "CHECK POWER MODE" },
2329 { ATA_CMD_STANDBY
, "STANDBY" },
2330 { ATA_CMD_IDLE
, "IDLE" },
2331 { ATA_CMD_EDD
, "EXECUTE DEVICE DIAGNOSTIC" },
2332 { ATA_CMD_DOWNLOAD_MICRO
, "DOWNLOAD MICROCODE" },
2333 { ATA_CMD_DOWNLOAD_MICRO_DMA
, "DOWNLOAD MICROCODE DMA" },
2334 { ATA_CMD_NOP
, "NOP" },
2335 { ATA_CMD_FLUSH
, "FLUSH CACHE" },
2336 { ATA_CMD_FLUSH_EXT
, "FLUSH CACHE EXT" },
2337 { ATA_CMD_ID_ATA
, "IDENTIFY DEVICE" },
2338 { ATA_CMD_ID_ATAPI
, "IDENTIFY PACKET DEVICE" },
2339 { ATA_CMD_SERVICE
, "SERVICE" },
2340 { ATA_CMD_READ
, "READ DMA" },
2341 { ATA_CMD_READ_EXT
, "READ DMA EXT" },
2342 { ATA_CMD_READ_QUEUED
, "READ DMA QUEUED" },
2343 { ATA_CMD_READ_STREAM_EXT
, "READ STREAM EXT" },
2344 { ATA_CMD_READ_STREAM_DMA_EXT
, "READ STREAM DMA EXT" },
2345 { ATA_CMD_WRITE
, "WRITE DMA" },
2346 { ATA_CMD_WRITE_EXT
, "WRITE DMA EXT" },
2347 { ATA_CMD_WRITE_QUEUED
, "WRITE DMA QUEUED EXT" },
2348 { ATA_CMD_WRITE_STREAM_EXT
, "WRITE STREAM EXT" },
2349 { ATA_CMD_WRITE_STREAM_DMA_EXT
, "WRITE STREAM DMA EXT" },
2350 { ATA_CMD_WRITE_FUA_EXT
, "WRITE DMA FUA EXT" },
2351 { ATA_CMD_WRITE_QUEUED_FUA_EXT
, "WRITE DMA QUEUED FUA EXT" },
2352 { ATA_CMD_FPDMA_READ
, "READ FPDMA QUEUED" },
2353 { ATA_CMD_FPDMA_WRITE
, "WRITE FPDMA QUEUED" },
2354 { ATA_CMD_FPDMA_SEND
, "SEND FPDMA QUEUED" },
2355 { ATA_CMD_FPDMA_RECV
, "RECEIVE FPDMA QUEUED" },
2356 { ATA_CMD_PIO_READ
, "READ SECTOR(S)" },
2357 { ATA_CMD_PIO_READ_EXT
, "READ SECTOR(S) EXT" },
2358 { ATA_CMD_PIO_WRITE
, "WRITE SECTOR(S)" },
2359 { ATA_CMD_PIO_WRITE_EXT
, "WRITE SECTOR(S) EXT" },
2360 { ATA_CMD_READ_MULTI
, "READ MULTIPLE" },
2361 { ATA_CMD_READ_MULTI_EXT
, "READ MULTIPLE EXT" },
2362 { ATA_CMD_WRITE_MULTI
, "WRITE MULTIPLE" },
2363 { ATA_CMD_WRITE_MULTI_EXT
, "WRITE MULTIPLE EXT" },
2364 { ATA_CMD_WRITE_MULTI_FUA_EXT
, "WRITE MULTIPLE FUA EXT" },
2365 { ATA_CMD_SET_FEATURES
, "SET FEATURES" },
2366 { ATA_CMD_SET_MULTI
, "SET MULTIPLE MODE" },
2367 { ATA_CMD_VERIFY
, "READ VERIFY SECTOR(S)" },
2368 { ATA_CMD_VERIFY_EXT
, "READ VERIFY SECTOR(S) EXT" },
2369 { ATA_CMD_WRITE_UNCORR_EXT
, "WRITE UNCORRECTABLE EXT" },
2370 { ATA_CMD_STANDBYNOW1
, "STANDBY IMMEDIATE" },
2371 { ATA_CMD_IDLEIMMEDIATE
, "IDLE IMMEDIATE" },
2372 { ATA_CMD_SLEEP
, "SLEEP" },
2373 { ATA_CMD_INIT_DEV_PARAMS
, "INITIALIZE DEVICE PARAMETERS" },
2374 { ATA_CMD_READ_NATIVE_MAX
, "READ NATIVE MAX ADDRESS" },
2375 { ATA_CMD_READ_NATIVE_MAX_EXT
, "READ NATIVE MAX ADDRESS EXT" },
2376 { ATA_CMD_SET_MAX
, "SET MAX ADDRESS" },
2377 { ATA_CMD_SET_MAX_EXT
, "SET MAX ADDRESS EXT" },
2378 { ATA_CMD_READ_LOG_EXT
, "READ LOG EXT" },
2379 { ATA_CMD_WRITE_LOG_EXT
, "WRITE LOG EXT" },
2380 { ATA_CMD_READ_LOG_DMA_EXT
, "READ LOG DMA EXT" },
2381 { ATA_CMD_WRITE_LOG_DMA_EXT
, "WRITE LOG DMA EXT" },
2382 { ATA_CMD_TRUSTED_NONDATA
, "TRUSTED NON-DATA" },
2383 { ATA_CMD_TRUSTED_RCV
, "TRUSTED RECEIVE" },
2384 { ATA_CMD_TRUSTED_RCV_DMA
, "TRUSTED RECEIVE DMA" },
2385 { ATA_CMD_TRUSTED_SND
, "TRUSTED SEND" },
2386 { ATA_CMD_TRUSTED_SND_DMA
, "TRUSTED SEND DMA" },
2387 { ATA_CMD_PMP_READ
, "READ BUFFER" },
2388 { ATA_CMD_PMP_READ_DMA
, "READ BUFFER DMA" },
2389 { ATA_CMD_PMP_WRITE
, "WRITE BUFFER" },
2390 { ATA_CMD_PMP_WRITE_DMA
, "WRITE BUFFER DMA" },
2391 { ATA_CMD_CONF_OVERLAY
, "DEVICE CONFIGURATION OVERLAY" },
2392 { ATA_CMD_SEC_SET_PASS
, "SECURITY SET PASSWORD" },
2393 { ATA_CMD_SEC_UNLOCK
, "SECURITY UNLOCK" },
2394 { ATA_CMD_SEC_ERASE_PREP
, "SECURITY ERASE PREPARE" },
2395 { ATA_CMD_SEC_ERASE_UNIT
, "SECURITY ERASE UNIT" },
2396 { ATA_CMD_SEC_FREEZE_LOCK
, "SECURITY FREEZE LOCK" },
2397 { ATA_CMD_SEC_DISABLE_PASS
, "SECURITY DISABLE PASSWORD" },
2398 { ATA_CMD_CONFIG_STREAM
, "CONFIGURE STREAM" },
2399 { ATA_CMD_SMART
, "SMART" },
2400 { ATA_CMD_MEDIA_LOCK
, "DOOR LOCK" },
2401 { ATA_CMD_MEDIA_UNLOCK
, "DOOR UNLOCK" },
2402 { ATA_CMD_DSM
, "DATA SET MANAGEMENT" },
2403 { ATA_CMD_CHK_MED_CRD_TYP
, "CHECK MEDIA CARD TYPE" },
2404 { ATA_CMD_CFA_REQ_EXT_ERR
, "CFA REQUEST EXTENDED ERROR" },
2405 { ATA_CMD_CFA_WRITE_NE
, "CFA WRITE SECTORS WITHOUT ERASE" },
2406 { ATA_CMD_CFA_TRANS_SECT
, "CFA TRANSLATE SECTOR" },
2407 { ATA_CMD_CFA_ERASE
, "CFA ERASE SECTORS" },
2408 { ATA_CMD_CFA_WRITE_MULT_NE
, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2409 { ATA_CMD_REQ_SENSE_DATA
, "REQUEST SENSE DATA EXT" },
2410 { ATA_CMD_SANITIZE_DEVICE
, "SANITIZE DEVICE" },
2411 { ATA_CMD_READ_LONG
, "READ LONG (with retries)" },
2412 { ATA_CMD_READ_LONG_ONCE
, "READ LONG (without retries)" },
2413 { ATA_CMD_WRITE_LONG
, "WRITE LONG (with retries)" },
2414 { ATA_CMD_WRITE_LONG_ONCE
, "WRITE LONG (without retries)" },
2415 { ATA_CMD_RESTORE
, "RECALIBRATE" },
2416 { 0, NULL
} /* terminate list */
2420 for (i
= 0; cmd_descr
[i
].text
; i
++)
2421 if (cmd_descr
[i
].command
== command
)
2422 return cmd_descr
[i
].text
;
2427 EXPORT_SYMBOL_GPL(ata_get_cmd_descript
);
2430 * ata_eh_link_report - report error handling to user
2431 * @link: ATA link EH is going on
2433 * Report EH to user.
2438 static void ata_eh_link_report(struct ata_link
*link
)
2440 struct ata_port
*ap
= link
->ap
;
2441 struct ata_eh_context
*ehc
= &link
->eh_context
;
2442 const char *frozen
, *desc
;
2443 char tries_buf
[6] = "";
2444 int tag
, nr_failed
= 0;
2446 if (ehc
->i
.flags
& ATA_EHI_QUIET
)
2450 if (ehc
->i
.desc
[0] != '\0')
2453 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2454 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2456 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2457 ata_dev_phys_link(qc
->dev
) != link
||
2458 ((qc
->flags
& ATA_QCFLAG_QUIET
) &&
2459 qc
->err_mask
== AC_ERR_DEV
))
2461 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
&& !qc
->err_mask
)
2467 if (!nr_failed
&& !ehc
->i
.err_mask
)
2471 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2474 if (ap
->eh_tries
< ATA_EH_MAX_TRIES
)
2475 snprintf(tries_buf
, sizeof(tries_buf
), " t%d",
2479 ata_dev_err(ehc
->i
.dev
, "exception Emask 0x%x "
2480 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2481 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2482 ehc
->i
.action
, frozen
, tries_buf
);
2484 ata_dev_err(ehc
->i
.dev
, "%s\n", desc
);
2486 ata_link_err(link
, "exception Emask 0x%x "
2487 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2488 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2489 ehc
->i
.action
, frozen
, tries_buf
);
2491 ata_link_err(link
, "%s\n", desc
);
2494 #ifdef CONFIG_ATA_VERBOSE_ERROR
2497 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2498 ehc
->i
.serror
& SERR_DATA_RECOVERED
? "RecovData " : "",
2499 ehc
->i
.serror
& SERR_COMM_RECOVERED
? "RecovComm " : "",
2500 ehc
->i
.serror
& SERR_DATA
? "UnrecovData " : "",
2501 ehc
->i
.serror
& SERR_PERSISTENT
? "Persist " : "",
2502 ehc
->i
.serror
& SERR_PROTOCOL
? "Proto " : "",
2503 ehc
->i
.serror
& SERR_INTERNAL
? "HostInt " : "",
2504 ehc
->i
.serror
& SERR_PHYRDY_CHG
? "PHYRdyChg " : "",
2505 ehc
->i
.serror
& SERR_PHY_INT_ERR
? "PHYInt " : "",
2506 ehc
->i
.serror
& SERR_COMM_WAKE
? "CommWake " : "",
2507 ehc
->i
.serror
& SERR_10B_8B_ERR
? "10B8B " : "",
2508 ehc
->i
.serror
& SERR_DISPARITY
? "Dispar " : "",
2509 ehc
->i
.serror
& SERR_CRC
? "BadCRC " : "",
2510 ehc
->i
.serror
& SERR_HANDSHAKE
? "Handshk " : "",
2511 ehc
->i
.serror
& SERR_LINK_SEQ_ERR
? "LinkSeq " : "",
2512 ehc
->i
.serror
& SERR_TRANS_ST_ERROR
? "TrStaTrns " : "",
2513 ehc
->i
.serror
& SERR_UNRECOG_FIS
? "UnrecFIS " : "",
2514 ehc
->i
.serror
& SERR_DEV_XCHG
? "DevExch " : "");
2517 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2518 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2519 struct ata_taskfile
*cmd
= &qc
->tf
, *res
= &qc
->result_tf
;
2520 char data_buf
[20] = "";
2521 char cdb_buf
[70] = "";
2523 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2524 ata_dev_phys_link(qc
->dev
) != link
|| !qc
->err_mask
)
2527 if (qc
->dma_dir
!= DMA_NONE
) {
2528 static const char *dma_str
[] = {
2529 [DMA_BIDIRECTIONAL
] = "bidi",
2530 [DMA_TO_DEVICE
] = "out",
2531 [DMA_FROM_DEVICE
] = "in",
2533 static const char *prot_str
[] = {
2534 [ATA_PROT_PIO
] = "pio",
2535 [ATA_PROT_DMA
] = "dma",
2536 [ATA_PROT_NCQ
] = "ncq",
2537 [ATAPI_PROT_PIO
] = "pio",
2538 [ATAPI_PROT_DMA
] = "dma",
2541 snprintf(data_buf
, sizeof(data_buf
), " %s %u %s",
2542 prot_str
[qc
->tf
.protocol
], qc
->nbytes
,
2543 dma_str
[qc
->dma_dir
]);
2546 if (ata_is_atapi(qc
->tf
.protocol
)) {
2547 const u8
*cdb
= qc
->cdb
;
2548 size_t cdb_len
= qc
->dev
->cdb_len
;
2551 cdb
= qc
->scsicmd
->cmnd
;
2552 cdb_len
= qc
->scsicmd
->cmd_len
;
2554 __scsi_format_command(cdb_buf
, sizeof(cdb_buf
),
2557 const char *descr
= ata_get_cmd_descript(cmd
->command
);
2559 ata_dev_err(qc
->dev
, "failed command: %s\n",
2563 ata_dev_err(qc
->dev
,
2564 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2566 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2567 "Emask 0x%x (%s)%s\n",
2568 cmd
->command
, cmd
->feature
, cmd
->nsect
,
2569 cmd
->lbal
, cmd
->lbam
, cmd
->lbah
,
2570 cmd
->hob_feature
, cmd
->hob_nsect
,
2571 cmd
->hob_lbal
, cmd
->hob_lbam
, cmd
->hob_lbah
,
2572 cmd
->device
, qc
->tag
, data_buf
, cdb_buf
,
2573 res
->command
, res
->feature
, res
->nsect
,
2574 res
->lbal
, res
->lbam
, res
->lbah
,
2575 res
->hob_feature
, res
->hob_nsect
,
2576 res
->hob_lbal
, res
->hob_lbam
, res
->hob_lbah
,
2577 res
->device
, qc
->err_mask
, ata_err_string(qc
->err_mask
),
2578 qc
->err_mask
& AC_ERR_NCQ
? " <F>" : "");
2580 #ifdef CONFIG_ATA_VERBOSE_ERROR
2581 if (res
->command
& (ATA_BUSY
| ATA_DRDY
| ATA_DF
| ATA_DRQ
|
2583 if (res
->command
& ATA_BUSY
)
2584 ata_dev_err(qc
->dev
, "status: { Busy }\n");
2586 ata_dev_err(qc
->dev
, "status: { %s%s%s%s}\n",
2587 res
->command
& ATA_DRDY
? "DRDY " : "",
2588 res
->command
& ATA_DF
? "DF " : "",
2589 res
->command
& ATA_DRQ
? "DRQ " : "",
2590 res
->command
& ATA_ERR
? "ERR " : "");
2593 if (cmd
->command
!= ATA_CMD_PACKET
&&
2594 (res
->feature
& (ATA_ICRC
| ATA_UNC
| ATA_AMNF
|
2595 ATA_IDNF
| ATA_ABORTED
)))
2596 ata_dev_err(qc
->dev
, "error: { %s%s%s%s%s}\n",
2597 res
->feature
& ATA_ICRC
? "ICRC " : "",
2598 res
->feature
& ATA_UNC
? "UNC " : "",
2599 res
->feature
& ATA_AMNF
? "AMNF " : "",
2600 res
->feature
& ATA_IDNF
? "IDNF " : "",
2601 res
->feature
& ATA_ABORTED
? "ABRT " : "");
2607 * ata_eh_report - report error handling to user
2608 * @ap: ATA port to report EH about
2610 * Report EH to user.
2615 void ata_eh_report(struct ata_port
*ap
)
2617 struct ata_link
*link
;
2619 ata_for_each_link(link
, ap
, HOST_FIRST
)
2620 ata_eh_link_report(link
);
2623 static int ata_do_reset(struct ata_link
*link
, ata_reset_fn_t reset
,
2624 unsigned int *classes
, unsigned long deadline
,
2627 struct ata_device
*dev
;
2630 ata_for_each_dev(dev
, link
, ALL
)
2631 classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
2633 return reset(link
, classes
, deadline
);
2636 static int ata_eh_followup_srst_needed(struct ata_link
*link
, int rc
)
2638 if ((link
->flags
& ATA_LFLAG_NO_SRST
) || ata_link_offline(link
))
2642 if (sata_pmp_supported(link
->ap
) && ata_is_host_link(link
))
2647 int ata_eh_reset(struct ata_link
*link
, int classify
,
2648 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
2649 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
2651 struct ata_port
*ap
= link
->ap
;
2652 struct ata_link
*slave
= ap
->slave_link
;
2653 struct ata_eh_context
*ehc
= &link
->eh_context
;
2654 struct ata_eh_context
*sehc
= slave
? &slave
->eh_context
: NULL
;
2655 unsigned int *classes
= ehc
->classes
;
2656 unsigned int lflags
= link
->flags
;
2657 int verbose
= !(ehc
->i
.flags
& ATA_EHI_QUIET
);
2658 int max_tries
= 0, try = 0;
2659 struct ata_link
*failed_link
;
2660 struct ata_device
*dev
;
2661 unsigned long deadline
, now
;
2662 ata_reset_fn_t reset
;
2663 unsigned long flags
;
2670 while (ata_eh_reset_timeouts
[max_tries
] != ULONG_MAX
)
2672 if (link
->flags
& ATA_LFLAG_RST_ONCE
)
2674 if (link
->flags
& ATA_LFLAG_NO_HRST
)
2676 if (link
->flags
& ATA_LFLAG_NO_SRST
)
2679 /* make sure each reset attempt is at least COOL_DOWN apart */
2680 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
2682 WARN_ON(time_after(ehc
->last_reset
, now
));
2683 deadline
= ata_deadline(ehc
->last_reset
,
2684 ATA_EH_RESET_COOL_DOWN
);
2685 if (time_before(now
, deadline
))
2686 schedule_timeout_uninterruptible(deadline
- now
);
2689 spin_lock_irqsave(ap
->lock
, flags
);
2690 ap
->pflags
|= ATA_PFLAG_RESETTING
;
2691 spin_unlock_irqrestore(ap
->lock
, flags
);
2693 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2695 ata_for_each_dev(dev
, link
, ALL
) {
2696 /* If we issue an SRST then an ATA drive (not ATAPI)
2697 * may change configuration and be in PIO0 timing. If
2698 * we do a hard reset (or are coming from power on)
2699 * this is true for ATA or ATAPI. Until we've set a
2700 * suitable controller mode we should not touch the
2701 * bus as we may be talking too fast.
2703 dev
->pio_mode
= XFER_PIO_0
;
2704 dev
->dma_mode
= 0xff;
2706 /* If the controller has a pio mode setup function
2707 * then use it to set the chipset to rights. Don't
2708 * touch the DMA setup as that will be dealt with when
2709 * configuring devices.
2711 if (ap
->ops
->set_piomode
)
2712 ap
->ops
->set_piomode(ap
, dev
);
2715 /* prefer hardreset */
2717 ehc
->i
.action
&= ~ATA_EH_RESET
;
2720 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2721 } else if (softreset
) {
2723 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2727 unsigned long deadline
= ata_deadline(jiffies
,
2728 ATA_EH_PRERESET_TIMEOUT
);
2731 sehc
->i
.action
&= ~ATA_EH_RESET
;
2732 sehc
->i
.action
|= ehc
->i
.action
;
2735 rc
= prereset(link
, deadline
);
2737 /* If present, do prereset on slave link too. Reset
2738 * is skipped iff both master and slave links report
2739 * -ENOENT or clear ATA_EH_RESET.
2741 if (slave
&& (rc
== 0 || rc
== -ENOENT
)) {
2744 tmp
= prereset(slave
, deadline
);
2748 ehc
->i
.action
|= sehc
->i
.action
;
2752 if (rc
== -ENOENT
) {
2753 ata_link_dbg(link
, "port disabled--ignoring\n");
2754 ehc
->i
.action
&= ~ATA_EH_RESET
;
2756 ata_for_each_dev(dev
, link
, ALL
)
2757 classes
[dev
->devno
] = ATA_DEV_NONE
;
2762 "prereset failed (errno=%d)\n",
2767 /* prereset() might have cleared ATA_EH_RESET. If so,
2768 * bang classes, thaw and return.
2770 if (reset
&& !(ehc
->i
.action
& ATA_EH_RESET
)) {
2771 ata_for_each_dev(dev
, link
, ALL
)
2772 classes
[dev
->devno
] = ATA_DEV_NONE
;
2773 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) &&
2774 ata_is_host_link(link
))
2775 ata_eh_thaw_port(ap
);
2785 if (ata_is_host_link(link
))
2786 ata_eh_freeze_port(ap
);
2788 deadline
= ata_deadline(jiffies
, ata_eh_reset_timeouts
[try++]);
2792 ata_link_info(link
, "%s resetting link\n",
2793 reset
== softreset
? "soft" : "hard");
2795 /* mark that this EH session started with reset */
2796 ehc
->last_reset
= jiffies
;
2797 if (reset
== hardreset
)
2798 ehc
->i
.flags
|= ATA_EHI_DID_HARDRESET
;
2800 ehc
->i
.flags
|= ATA_EHI_DID_SOFTRESET
;
2802 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2803 if (rc
&& rc
!= -EAGAIN
) {
2808 /* hardreset slave link if existent */
2809 if (slave
&& reset
== hardreset
) {
2813 ata_link_info(slave
, "hard resetting link\n");
2815 ata_eh_about_to_do(slave
, NULL
, ATA_EH_RESET
);
2816 tmp
= ata_do_reset(slave
, reset
, classes
, deadline
,
2824 failed_link
= slave
;
2830 /* perform follow-up SRST if necessary */
2831 if (reset
== hardreset
&&
2832 ata_eh_followup_srst_needed(link
, rc
)) {
2837 "follow-up softreset required but no softreset available\n");
2843 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2844 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2853 "no reset method available, skipping reset\n");
2854 if (!(lflags
& ATA_LFLAG_ASSUME_CLASS
))
2855 lflags
|= ATA_LFLAG_ASSUME_ATA
;
2859 * Post-reset processing
2861 ata_for_each_dev(dev
, link
, ALL
) {
2862 /* After the reset, the device state is PIO 0 and the
2863 * controller state is undefined. Reset also wakes up
2864 * drives from sleeping mode.
2866 dev
->pio_mode
= XFER_PIO_0
;
2867 dev
->flags
&= ~ATA_DFLAG_SLEEPING
;
2869 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
2872 /* apply class override */
2873 if (lflags
& ATA_LFLAG_ASSUME_ATA
)
2874 classes
[dev
->devno
] = ATA_DEV_ATA
;
2875 else if (lflags
& ATA_LFLAG_ASSUME_SEMB
)
2876 classes
[dev
->devno
] = ATA_DEV_SEMB_UNSUP
;
2879 /* record current link speed */
2880 if (sata_scr_read(link
, SCR_STATUS
, &sstatus
) == 0)
2881 link
->sata_spd
= (sstatus
>> 4) & 0xf;
2882 if (slave
&& sata_scr_read(slave
, SCR_STATUS
, &sstatus
) == 0)
2883 slave
->sata_spd
= (sstatus
>> 4) & 0xf;
2886 if (ata_is_host_link(link
))
2887 ata_eh_thaw_port(ap
);
2889 /* postreset() should clear hardware SError. Although SError
2890 * is cleared during link resume, clearing SError here is
2891 * necessary as some PHYs raise hotplug events after SRST.
2892 * This introduces race condition where hotplug occurs between
2893 * reset and here. This race is mediated by cross checking
2894 * link onlineness and classification result later.
2897 postreset(link
, classes
);
2899 postreset(slave
, classes
);
2903 * Some controllers can't be frozen very well and may set spurious
2904 * error conditions during reset. Clear accumulated error
2905 * information and re-thaw the port if frozen. As reset is the
2906 * final recovery action and we cross check link onlineness against
2907 * device classification later, no hotplug event is lost by this.
2909 spin_lock_irqsave(link
->ap
->lock
, flags
);
2910 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
2912 memset(&slave
->eh_info
, 0, sizeof(link
->eh_info
));
2913 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
2914 spin_unlock_irqrestore(link
->ap
->lock
, flags
);
2916 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2917 ata_eh_thaw_port(ap
);
2920 * Make sure onlineness and classification result correspond.
2921 * Hotplug could have happened during reset and some
2922 * controllers fail to wait while a drive is spinning up after
2923 * being hotplugged causing misdetection. By cross checking
2924 * link on/offlineness and classification result, those
2925 * conditions can be reliably detected and retried.
2928 ata_for_each_dev(dev
, link
, ALL
) {
2929 if (ata_phys_link_online(ata_dev_phys_link(dev
))) {
2930 if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
2931 ata_dev_dbg(dev
, "link online but device misclassified\n");
2932 classes
[dev
->devno
] = ATA_DEV_NONE
;
2935 } else if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
2936 if (ata_class_enabled(classes
[dev
->devno
]))
2938 "link offline, clearing class %d to NONE\n",
2939 classes
[dev
->devno
]);
2940 classes
[dev
->devno
] = ATA_DEV_NONE
;
2941 } else if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
2943 "link status unknown, clearing UNKNOWN to NONE\n");
2944 classes
[dev
->devno
] = ATA_DEV_NONE
;
2948 if (classify
&& nr_unknown
) {
2949 if (try < max_tries
) {
2951 "link online but %d devices misclassified, retrying\n",
2958 "link online but %d devices misclassified, "
2959 "device detection might fail\n", nr_unknown
);
2962 /* reset successful, schedule revalidation */
2963 ata_eh_done(link
, NULL
, ATA_EH_RESET
);
2965 ata_eh_done(slave
, NULL
, ATA_EH_RESET
);
2966 ehc
->last_reset
= jiffies
; /* update to completion time */
2967 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2968 link
->lpm_policy
= ATA_LPM_UNKNOWN
; /* reset LPM state */
2972 /* clear hotplug flag */
2973 ehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2975 sehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2977 spin_lock_irqsave(ap
->lock
, flags
);
2978 ap
->pflags
&= ~ATA_PFLAG_RESETTING
;
2979 spin_unlock_irqrestore(ap
->lock
, flags
);
2984 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2985 if (!ata_is_host_link(link
) &&
2986 sata_scr_read(link
, SCR_STATUS
, &sstatus
))
2989 if (try >= max_tries
) {
2991 * Thaw host port even if reset failed, so that the port
2992 * can be retried on the next phy event. This risks
2993 * repeated EH runs but seems to be a better tradeoff than
2994 * shutting down a port after a botched hotplug attempt.
2996 if (ata_is_host_link(link
))
2997 ata_eh_thaw_port(ap
);
3002 if (time_before(now
, deadline
)) {
3003 unsigned long delta
= deadline
- now
;
3005 ata_link_warn(failed_link
,
3006 "reset failed (errno=%d), retrying in %u secs\n",
3007 rc
, DIV_ROUND_UP(jiffies_to_msecs(delta
), 1000));
3011 delta
= schedule_timeout_uninterruptible(delta
);
3016 * While disks spinup behind PMP, some controllers fail sending SRST.
3017 * They need to be reset - as well as the PMP - before retrying.
3019 if (rc
== -ERESTART
) {
3020 if (ata_is_host_link(link
))
3021 ata_eh_thaw_port(ap
);
3025 if (try == max_tries
- 1) {
3026 sata_down_spd_limit(link
, 0);
3028 sata_down_spd_limit(slave
, 0);
3029 } else if (rc
== -EPIPE
)
3030 sata_down_spd_limit(failed_link
, 0);
3037 static inline void ata_eh_pull_park_action(struct ata_port
*ap
)
3039 struct ata_link
*link
;
3040 struct ata_device
*dev
;
3041 unsigned long flags
;
3044 * This function can be thought of as an extended version of
3045 * ata_eh_about_to_do() specially crafted to accommodate the
3046 * requirements of ATA_EH_PARK handling. Since the EH thread
3047 * does not leave the do {} while () loop in ata_eh_recover as
3048 * long as the timeout for a park request to *one* device on
3049 * the port has not expired, and since we still want to pick
3050 * up park requests to other devices on the same port or
3051 * timeout updates for the same device, we have to pull
3052 * ATA_EH_PARK actions from eh_info into eh_context.i
3053 * ourselves at the beginning of each pass over the loop.
3055 * Additionally, all write accesses to &ap->park_req_pending
3056 * through reinit_completion() (see below) or complete_all()
3057 * (see ata_scsi_park_store()) are protected by the host lock.
3058 * As a result we have that park_req_pending.done is zero on
3059 * exit from this function, i.e. when ATA_EH_PARK actions for
3060 * *all* devices on port ap have been pulled into the
3061 * respective eh_context structs. If, and only if,
3062 * park_req_pending.done is non-zero by the time we reach
3063 * wait_for_completion_timeout(), another ATA_EH_PARK action
3064 * has been scheduled for at least one of the devices on port
3065 * ap and we have to cycle over the do {} while () loop in
3066 * ata_eh_recover() again.
3069 spin_lock_irqsave(ap
->lock
, flags
);
3070 reinit_completion(&ap
->park_req_pending
);
3071 ata_for_each_link(link
, ap
, EDGE
) {
3072 ata_for_each_dev(dev
, link
, ALL
) {
3073 struct ata_eh_info
*ehi
= &link
->eh_info
;
3075 link
->eh_context
.i
.dev_action
[dev
->devno
] |=
3076 ehi
->dev_action
[dev
->devno
] & ATA_EH_PARK
;
3077 ata_eh_clear_action(link
, dev
, ehi
, ATA_EH_PARK
);
3080 spin_unlock_irqrestore(ap
->lock
, flags
);
3083 static void ata_eh_park_issue_cmd(struct ata_device
*dev
, int park
)
3085 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3086 struct ata_taskfile tf
;
3087 unsigned int err_mask
;
3089 ata_tf_init(dev
, &tf
);
3091 ehc
->unloaded_mask
|= 1 << dev
->devno
;
3092 tf
.command
= ATA_CMD_IDLEIMMEDIATE
;
3098 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
3099 tf
.command
= ATA_CMD_CHK_POWER
;
3102 tf
.flags
|= ATA_TFLAG_DEVICE
| ATA_TFLAG_ISADDR
;
3103 tf
.protocol
|= ATA_PROT_NODATA
;
3104 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
3105 if (park
&& (err_mask
|| tf
.lbal
!= 0xc4)) {
3106 ata_dev_err(dev
, "head unload failed!\n");
3107 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
3111 static int ata_eh_revalidate_and_attach(struct ata_link
*link
,
3112 struct ata_device
**r_failed_dev
)
3114 struct ata_port
*ap
= link
->ap
;
3115 struct ata_eh_context
*ehc
= &link
->eh_context
;
3116 struct ata_device
*dev
;
3117 unsigned int new_mask
= 0;
3118 unsigned long flags
;
3123 /* For PATA drive side cable detection to work, IDENTIFY must
3124 * be done backwards such that PDIAG- is released by the slave
3125 * device before the master device is identified.
3127 ata_for_each_dev(dev
, link
, ALL_REVERSE
) {
3128 unsigned int action
= ata_eh_dev_action(dev
);
3129 unsigned int readid_flags
= 0;
3131 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
3132 readid_flags
|= ATA_READID_POSTRESET
;
3134 if ((action
& ATA_EH_REVALIDATE
) && ata_dev_enabled(dev
)) {
3135 WARN_ON(dev
->class == ATA_DEV_PMP
);
3137 if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
3142 ata_eh_about_to_do(link
, dev
, ATA_EH_REVALIDATE
);
3143 rc
= ata_dev_revalidate(dev
, ehc
->classes
[dev
->devno
],
3148 ata_eh_done(link
, dev
, ATA_EH_REVALIDATE
);
3150 /* Configuration may have changed, reconfigure
3153 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
3155 /* schedule the scsi_rescan_device() here */
3156 schedule_work(&(ap
->scsi_rescan_task
));
3157 } else if (dev
->class == ATA_DEV_UNKNOWN
&&
3158 ehc
->tries
[dev
->devno
] &&
3159 ata_class_enabled(ehc
->classes
[dev
->devno
])) {
3160 /* Temporarily set dev->class, it will be
3161 * permanently set once all configurations are
3162 * complete. This is necessary because new
3163 * device configuration is done in two
3166 dev
->class = ehc
->classes
[dev
->devno
];
3168 if (dev
->class == ATA_DEV_PMP
)
3169 rc
= sata_pmp_attach(dev
);
3171 rc
= ata_dev_read_id(dev
, &dev
->class,
3172 readid_flags
, dev
->id
);
3174 /* read_id might have changed class, store and reset */
3175 ehc
->classes
[dev
->devno
] = dev
->class;
3176 dev
->class = ATA_DEV_UNKNOWN
;
3180 /* clear error info accumulated during probe */
3181 ata_ering_clear(&dev
->ering
);
3182 new_mask
|= 1 << dev
->devno
;
3185 /* IDENTIFY was issued to non-existent
3186 * device. No need to reset. Just
3187 * thaw and ignore the device.
3189 ata_eh_thaw_port(ap
);
3197 /* PDIAG- should have been released, ask cable type if post-reset */
3198 if ((ehc
->i
.flags
& ATA_EHI_DID_RESET
) && ata_is_host_link(link
)) {
3199 if (ap
->ops
->cable_detect
)
3200 ap
->cbl
= ap
->ops
->cable_detect(ap
);
3204 /* Configure new devices forward such that user doesn't see
3205 * device detection messages backwards.
3207 ata_for_each_dev(dev
, link
, ALL
) {
3208 if (!(new_mask
& (1 << dev
->devno
)))
3211 dev
->class = ehc
->classes
[dev
->devno
];
3213 if (dev
->class == ATA_DEV_PMP
)
3216 ehc
->i
.flags
|= ATA_EHI_PRINTINFO
;
3217 rc
= ata_dev_configure(dev
);
3218 ehc
->i
.flags
&= ~ATA_EHI_PRINTINFO
;
3220 dev
->class = ATA_DEV_UNKNOWN
;
3224 spin_lock_irqsave(ap
->lock
, flags
);
3225 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
3226 spin_unlock_irqrestore(ap
->lock
, flags
);
3228 /* new device discovered, configure xfermode */
3229 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
3235 *r_failed_dev
= dev
;
3236 DPRINTK("EXIT rc=%d\n", rc
);
3241 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3242 * @link: link on which timings will be programmed
3243 * @r_failed_dev: out parameter for failed device
3245 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3246 * ata_set_mode() fails, pointer to the failing device is
3247 * returned in @r_failed_dev.
3250 * PCI/etc. bus probe sem.
3253 * 0 on success, negative errno otherwise
3255 int ata_set_mode(struct ata_link
*link
, struct ata_device
**r_failed_dev
)
3257 struct ata_port
*ap
= link
->ap
;
3258 struct ata_device
*dev
;
3261 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
3262 ata_for_each_dev(dev
, link
, ENABLED
) {
3263 if (!(dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)) {
3264 struct ata_ering_entry
*ent
;
3266 ent
= ata_ering_top(&dev
->ering
);
3268 ent
->eflags
&= ~ATA_EFLAG_DUBIOUS_XFER
;
3272 /* has private set_mode? */
3273 if (ap
->ops
->set_mode
)
3274 rc
= ap
->ops
->set_mode(link
, r_failed_dev
);
3276 rc
= ata_do_set_mode(link
, r_failed_dev
);
3278 /* if transfer mode has changed, set DUBIOUS_XFER on device */
3279 ata_for_each_dev(dev
, link
, ENABLED
) {
3280 struct ata_eh_context
*ehc
= &link
->eh_context
;
3281 u8 saved_xfer_mode
= ehc
->saved_xfer_mode
[dev
->devno
];
3282 u8 saved_ncq
= !!(ehc
->saved_ncq_enabled
& (1 << dev
->devno
));
3284 if (dev
->xfer_mode
!= saved_xfer_mode
||
3285 ata_ncq_enabled(dev
) != saved_ncq
)
3286 dev
->flags
|= ATA_DFLAG_DUBIOUS_XFER
;
3293 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3294 * @dev: ATAPI device to clear UA for
3296 * Resets and other operations can make an ATAPI device raise
3297 * UNIT ATTENTION which causes the next operation to fail. This
3298 * function clears UA.
3301 * EH context (may sleep).
3304 * 0 on success, -errno on failure.
3306 static int atapi_eh_clear_ua(struct ata_device
*dev
)
3310 for (i
= 0; i
< ATA_EH_UA_TRIES
; i
++) {
3311 u8
*sense_buffer
= dev
->link
->ap
->sector_buf
;
3313 unsigned int err_mask
;
3315 err_mask
= atapi_eh_tur(dev
, &sense_key
);
3316 if (err_mask
!= 0 && err_mask
!= AC_ERR_DEV
) {
3318 "TEST_UNIT_READY failed (err_mask=0x%x)\n",
3323 if (!err_mask
|| sense_key
!= UNIT_ATTENTION
)
3326 err_mask
= atapi_eh_request_sense(dev
, sense_buffer
, sense_key
);
3328 ata_dev_warn(dev
, "failed to clear "
3329 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask
);
3334 ata_dev_warn(dev
, "UNIT ATTENTION persists after %d tries\n",
3341 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3342 * @dev: ATA device which may need FLUSH retry
3344 * If @dev failed FLUSH, it needs to be reported upper layer
3345 * immediately as it means that @dev failed to remap and already
3346 * lost at least a sector and further FLUSH retrials won't make
3347 * any difference to the lost sector. However, if FLUSH failed
3348 * for other reasons, for example transmission error, FLUSH needs
3351 * This function determines whether FLUSH failure retry is
3352 * necessary and performs it if so.
3355 * 0 if EH can continue, -errno if EH needs to be repeated.
3357 static int ata_eh_maybe_retry_flush(struct ata_device
*dev
)
3359 struct ata_link
*link
= dev
->link
;
3360 struct ata_port
*ap
= link
->ap
;
3361 struct ata_queued_cmd
*qc
;
3362 struct ata_taskfile tf
;
3363 unsigned int err_mask
;
3366 /* did flush fail for this device? */
3367 if (!ata_tag_valid(link
->active_tag
))
3370 qc
= __ata_qc_from_tag(ap
, link
->active_tag
);
3371 if (qc
->dev
!= dev
|| (qc
->tf
.command
!= ATA_CMD_FLUSH_EXT
&&
3372 qc
->tf
.command
!= ATA_CMD_FLUSH
))
3375 /* if the device failed it, it should be reported to upper layers */
3376 if (qc
->err_mask
& AC_ERR_DEV
)
3379 /* flush failed for some other reason, give it another shot */
3380 ata_tf_init(dev
, &tf
);
3382 tf
.command
= qc
->tf
.command
;
3383 tf
.flags
|= ATA_TFLAG_DEVICE
;
3384 tf
.protocol
= ATA_PROT_NODATA
;
3386 ata_dev_warn(dev
, "retrying FLUSH 0x%x Emask 0x%x\n",
3387 tf
.command
, qc
->err_mask
);
3389 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
3392 * FLUSH is complete but there's no way to
3393 * successfully complete a failed command from EH.
3394 * Making sure retry is allowed at least once and
3395 * retrying it should do the trick - whatever was in
3396 * the cache is already on the platter and this won't
3397 * cause infinite loop.
3399 qc
->scsicmd
->allowed
= max(qc
->scsicmd
->allowed
, 1);
3401 ata_dev_warn(dev
, "FLUSH failed Emask 0x%x\n",
3405 /* if device failed it, report it to upper layers */
3406 if (err_mask
& AC_ERR_DEV
) {
3407 qc
->err_mask
|= AC_ERR_DEV
;
3409 if (!(ap
->pflags
& ATA_PFLAG_FROZEN
))
3417 * ata_eh_set_lpm - configure SATA interface power management
3418 * @link: link to configure power management
3419 * @policy: the link power management policy
3420 * @r_failed_dev: out parameter for failed device
3422 * Enable SATA Interface power management. This will enable
3423 * Device Interface Power Management (DIPM) for min_power
3424 * policy, and then call driver specific callbacks for
3425 * enabling Host Initiated Power management.
3431 * 0 on success, -errno on failure.
3433 static int ata_eh_set_lpm(struct ata_link
*link
, enum ata_lpm_policy policy
,
3434 struct ata_device
**r_failed_dev
)
3436 struct ata_port
*ap
= ata_is_host_link(link
) ? link
->ap
: NULL
;
3437 struct ata_eh_context
*ehc
= &link
->eh_context
;
3438 struct ata_device
*dev
, *link_dev
= NULL
, *lpm_dev
= NULL
;
3439 enum ata_lpm_policy old_policy
= link
->lpm_policy
;
3440 bool no_dipm
= link
->ap
->flags
& ATA_FLAG_NO_DIPM
;
3441 unsigned int hints
= ATA_LPM_EMPTY
| ATA_LPM_HIPM
;
3442 unsigned int err_mask
;
3445 /* if the link or host doesn't do LPM, noop */
3446 if ((link
->flags
& ATA_LFLAG_NO_LPM
) || (ap
&& !ap
->ops
->set_lpm
))
3450 * DIPM is enabled only for MIN_POWER as some devices
3451 * misbehave when the host NACKs transition to SLUMBER. Order
3452 * device and link configurations such that the host always
3453 * allows DIPM requests.
3455 ata_for_each_dev(dev
, link
, ENABLED
) {
3456 bool hipm
= ata_id_has_hipm(dev
->id
);
3457 bool dipm
= ata_id_has_dipm(dev
->id
) && !no_dipm
;
3459 /* find the first enabled and LPM enabled devices */
3463 if (!lpm_dev
&& (hipm
|| dipm
))
3466 hints
&= ~ATA_LPM_EMPTY
;
3468 hints
&= ~ATA_LPM_HIPM
;
3470 /* disable DIPM before changing link config */
3471 if (policy
!= ATA_LPM_MIN_POWER
&& dipm
) {
3472 err_mask
= ata_dev_set_feature(dev
,
3473 SETFEATURES_SATA_DISABLE
, SATA_DIPM
);
3474 if (err_mask
&& err_mask
!= AC_ERR_DEV
) {
3476 "failed to disable DIPM, Emask 0x%x\n",
3485 rc
= ap
->ops
->set_lpm(link
, policy
, hints
);
3486 if (!rc
&& ap
->slave_link
)
3487 rc
= ap
->ops
->set_lpm(ap
->slave_link
, policy
, hints
);
3489 rc
= sata_pmp_set_lpm(link
, policy
, hints
);
3492 * Attribute link config failure to the first (LPM) enabled
3493 * device on the link.
3496 if (rc
== -EOPNOTSUPP
) {
3497 link
->flags
|= ATA_LFLAG_NO_LPM
;
3500 dev
= lpm_dev
? lpm_dev
: link_dev
;
3505 * Low level driver acked the transition. Issue DIPM command
3506 * with the new policy set.
3508 link
->lpm_policy
= policy
;
3509 if (ap
&& ap
->slave_link
)
3510 ap
->slave_link
->lpm_policy
= policy
;
3512 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3513 ata_for_each_dev(dev
, link
, ENABLED
) {
3514 if (policy
== ATA_LPM_MIN_POWER
&& !no_dipm
&&
3515 ata_id_has_dipm(dev
->id
)) {
3516 err_mask
= ata_dev_set_feature(dev
,
3517 SETFEATURES_SATA_ENABLE
, SATA_DIPM
);
3518 if (err_mask
&& err_mask
!= AC_ERR_DEV
) {
3520 "failed to enable DIPM, Emask 0x%x\n",
3528 link
->last_lpm_change
= jiffies
;
3529 link
->flags
|= ATA_LFLAG_CHANGED
;
3534 /* restore the old policy */
3535 link
->lpm_policy
= old_policy
;
3536 if (ap
&& ap
->slave_link
)
3537 ap
->slave_link
->lpm_policy
= old_policy
;
3539 /* if no device or only one more chance is left, disable LPM */
3540 if (!dev
|| ehc
->tries
[dev
->devno
] <= 2) {
3541 ata_link_warn(link
, "disabling LPM on the link\n");
3542 link
->flags
|= ATA_LFLAG_NO_LPM
;
3545 *r_failed_dev
= dev
;
3549 int ata_link_nr_enabled(struct ata_link
*link
)
3551 struct ata_device
*dev
;
3554 ata_for_each_dev(dev
, link
, ENABLED
)
3559 static int ata_link_nr_vacant(struct ata_link
*link
)
3561 struct ata_device
*dev
;
3564 ata_for_each_dev(dev
, link
, ALL
)
3565 if (dev
->class == ATA_DEV_UNKNOWN
)
3570 static int ata_eh_skip_recovery(struct ata_link
*link
)
3572 struct ata_port
*ap
= link
->ap
;
3573 struct ata_eh_context
*ehc
= &link
->eh_context
;
3574 struct ata_device
*dev
;
3576 /* skip disabled links */
3577 if (link
->flags
& ATA_LFLAG_DISABLED
)
3580 /* skip if explicitly requested */
3581 if (ehc
->i
.flags
& ATA_EHI_NO_RECOVERY
)
3584 /* thaw frozen port and recover failed devices */
3585 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) || ata_link_nr_enabled(link
))
3588 /* reset at least once if reset is requested */
3589 if ((ehc
->i
.action
& ATA_EH_RESET
) &&
3590 !(ehc
->i
.flags
& ATA_EHI_DID_RESET
))
3593 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
3594 ata_for_each_dev(dev
, link
, ALL
) {
3595 if (dev
->class == ATA_DEV_UNKNOWN
&&
3596 ehc
->classes
[dev
->devno
] != ATA_DEV_NONE
)
3603 static int ata_count_probe_trials_cb(struct ata_ering_entry
*ent
, void *void_arg
)
3605 u64 interval
= msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL
);
3606 u64 now
= get_jiffies_64();
3607 int *trials
= void_arg
;
3609 if ((ent
->eflags
& ATA_EFLAG_OLD_ER
) ||
3610 (ent
->timestamp
< now
- min(now
, interval
)))
3617 static int ata_eh_schedule_probe(struct ata_device
*dev
)
3619 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3620 struct ata_link
*link
= ata_dev_phys_link(dev
);
3623 if (!(ehc
->i
.probe_mask
& (1 << dev
->devno
)) ||
3624 (ehc
->did_probe_mask
& (1 << dev
->devno
)))
3627 ata_eh_detach_dev(dev
);
3629 ehc
->did_probe_mask
|= (1 << dev
->devno
);
3630 ehc
->i
.action
|= ATA_EH_RESET
;
3631 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
3632 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
3634 /* the link maybe in a deep sleep, wake it up */
3635 if (link
->lpm_policy
> ATA_LPM_MAX_POWER
) {
3636 if (ata_is_host_link(link
))
3637 link
->ap
->ops
->set_lpm(link
, ATA_LPM_MAX_POWER
,
3640 sata_pmp_set_lpm(link
, ATA_LPM_MAX_POWER
,
3644 /* Record and count probe trials on the ering. The specific
3645 * error mask used is irrelevant. Because a successful device
3646 * detection clears the ering, this count accumulates only if
3647 * there are consecutive failed probes.
3649 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3650 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3651 * forced to 1.5Gbps.
3653 * This is to work around cases where failed link speed
3654 * negotiation results in device misdetection leading to
3655 * infinite DEVXCHG or PHRDY CHG events.
3657 ata_ering_record(&dev
->ering
, 0, AC_ERR_OTHER
);
3658 ata_ering_map(&dev
->ering
, ata_count_probe_trials_cb
, &trials
);
3660 if (trials
> ATA_EH_PROBE_TRIALS
)
3661 sata_down_spd_limit(link
, 1);
3666 static int ata_eh_handle_dev_fail(struct ata_device
*dev
, int err
)
3668 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3670 /* -EAGAIN from EH routine indicates retry without prejudice.
3671 * The requester is responsible for ensuring forward progress.
3674 ehc
->tries
[dev
->devno
]--;
3678 /* device missing or wrong IDENTIFY data, schedule probing */
3679 ehc
->i
.probe_mask
|= (1 << dev
->devno
);
3681 /* give it just one more chance */
3682 ehc
->tries
[dev
->devno
] = min(ehc
->tries
[dev
->devno
], 1);
3684 if (ehc
->tries
[dev
->devno
] == 1) {
3685 /* This is the last chance, better to slow
3686 * down than lose it.
3688 sata_down_spd_limit(ata_dev_phys_link(dev
), 0);
3689 if (dev
->pio_mode
> XFER_PIO_0
)
3690 ata_down_xfermask_limit(dev
, ATA_DNXFER_PIO
);
3694 if (ata_dev_enabled(dev
) && !ehc
->tries
[dev
->devno
]) {
3695 /* disable device if it has used up all its chances */
3696 ata_dev_disable(dev
);
3698 /* detach if offline */
3699 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
3700 ata_eh_detach_dev(dev
);
3702 /* schedule probe if necessary */
3703 if (ata_eh_schedule_probe(dev
)) {
3704 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3705 memset(ehc
->cmd_timeout_idx
[dev
->devno
], 0,
3706 sizeof(ehc
->cmd_timeout_idx
[dev
->devno
]));
3711 ehc
->i
.action
|= ATA_EH_RESET
;
3717 * ata_eh_recover - recover host port after error
3718 * @ap: host port to recover
3719 * @prereset: prereset method (can be NULL)
3720 * @softreset: softreset method (can be NULL)
3721 * @hardreset: hardreset method (can be NULL)
3722 * @postreset: postreset method (can be NULL)
3723 * @r_failed_link: out parameter for failed link
3725 * This is the alpha and omega, eum and yang, heart and soul of
3726 * libata exception handling. On entry, actions required to
3727 * recover each link and hotplug requests are recorded in the
3728 * link's eh_context. This function executes all the operations
3729 * with appropriate retrials and fallbacks to resurrect failed
3730 * devices, detach goners and greet newcomers.
3733 * Kernel thread context (may sleep).
3736 * 0 on success, -errno on failure.
3738 int ata_eh_recover(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3739 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3740 ata_postreset_fn_t postreset
,
3741 struct ata_link
**r_failed_link
)
3743 struct ata_link
*link
;
3744 struct ata_device
*dev
;
3746 unsigned long flags
, deadline
;
3750 /* prep for recovery */
3751 ata_for_each_link(link
, ap
, EDGE
) {
3752 struct ata_eh_context
*ehc
= &link
->eh_context
;
3754 /* re-enable link? */
3755 if (ehc
->i
.action
& ATA_EH_ENABLE_LINK
) {
3756 ata_eh_about_to_do(link
, NULL
, ATA_EH_ENABLE_LINK
);
3757 spin_lock_irqsave(ap
->lock
, flags
);
3758 link
->flags
&= ~ATA_LFLAG_DISABLED
;
3759 spin_unlock_irqrestore(ap
->lock
, flags
);
3760 ata_eh_done(link
, NULL
, ATA_EH_ENABLE_LINK
);
3763 ata_for_each_dev(dev
, link
, ALL
) {
3764 if (link
->flags
& ATA_LFLAG_NO_RETRY
)
3765 ehc
->tries
[dev
->devno
] = 1;
3767 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3769 /* collect port action mask recorded in dev actions */
3770 ehc
->i
.action
|= ehc
->i
.dev_action
[dev
->devno
] &
3771 ~ATA_EH_PERDEV_MASK
;
3772 ehc
->i
.dev_action
[dev
->devno
] &= ATA_EH_PERDEV_MASK
;
3774 /* process hotplug request */
3775 if (dev
->flags
& ATA_DFLAG_DETACH
)
3776 ata_eh_detach_dev(dev
);
3778 /* schedule probe if necessary */
3779 if (!ata_dev_enabled(dev
))
3780 ata_eh_schedule_probe(dev
);
3787 /* if UNLOADING, finish immediately */
3788 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
3792 ata_for_each_link(link
, ap
, EDGE
) {
3793 struct ata_eh_context
*ehc
= &link
->eh_context
;
3795 /* skip EH if possible. */
3796 if (ata_eh_skip_recovery(link
))
3799 ata_for_each_dev(dev
, link
, ALL
)
3800 ehc
->classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
3804 ata_for_each_link(link
, ap
, EDGE
) {
3805 struct ata_eh_context
*ehc
= &link
->eh_context
;
3807 if (!(ehc
->i
.action
& ATA_EH_RESET
))
3810 rc
= ata_eh_reset(link
, ata_link_nr_vacant(link
),
3811 prereset
, softreset
, hardreset
, postreset
);
3813 ata_link_err(link
, "reset failed, giving up\n");
3822 * clears ATA_EH_PARK in eh_info and resets
3823 * ap->park_req_pending
3825 ata_eh_pull_park_action(ap
);
3828 ata_for_each_link(link
, ap
, EDGE
) {
3829 ata_for_each_dev(dev
, link
, ALL
) {
3830 struct ata_eh_context
*ehc
= &link
->eh_context
;
3833 if (dev
->class != ATA_DEV_ATA
&&
3834 dev
->class != ATA_DEV_ZAC
)
3836 if (!(ehc
->i
.dev_action
[dev
->devno
] &
3839 tmp
= dev
->unpark_deadline
;
3840 if (time_before(deadline
, tmp
))
3842 else if (time_before_eq(tmp
, jiffies
))
3844 if (ehc
->unloaded_mask
& (1 << dev
->devno
))
3847 ata_eh_park_issue_cmd(dev
, 1);
3852 if (time_before_eq(deadline
, now
))
3856 deadline
= wait_for_completion_timeout(&ap
->park_req_pending
,
3860 ata_for_each_link(link
, ap
, EDGE
) {
3861 ata_for_each_dev(dev
, link
, ALL
) {
3862 if (!(link
->eh_context
.unloaded_mask
&
3866 ata_eh_park_issue_cmd(dev
, 0);
3867 ata_eh_done(link
, dev
, ATA_EH_PARK
);
3873 ata_for_each_link(link
, ap
, PMP_FIRST
) {
3874 struct ata_eh_context
*ehc
= &link
->eh_context
;
3876 if (sata_pmp_attached(ap
) && ata_is_host_link(link
))
3879 /* revalidate existing devices and attach new ones */
3880 rc
= ata_eh_revalidate_and_attach(link
, &dev
);
3884 /* if PMP got attached, return, pmp EH will take care of it */
3885 if (link
->device
->class == ATA_DEV_PMP
) {
3890 /* configure transfer mode if necessary */
3891 if (ehc
->i
.flags
& ATA_EHI_SETMODE
) {
3892 rc
= ata_set_mode(link
, &dev
);
3895 ehc
->i
.flags
&= ~ATA_EHI_SETMODE
;
3898 /* If reset has been issued, clear UA to avoid
3899 * disrupting the current users of the device.
3901 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
3902 ata_for_each_dev(dev
, link
, ALL
) {
3903 if (dev
->class != ATA_DEV_ATAPI
)
3905 rc
= atapi_eh_clear_ua(dev
);
3908 if (zpodd_dev_enabled(dev
))
3909 zpodd_post_poweron(dev
);
3913 /* retry flush if necessary */
3914 ata_for_each_dev(dev
, link
, ALL
) {
3915 if (dev
->class != ATA_DEV_ATA
&&
3916 dev
->class != ATA_DEV_ZAC
)
3918 rc
= ata_eh_maybe_retry_flush(dev
);
3924 /* configure link power saving */
3925 if (link
->lpm_policy
!= ap
->target_lpm_policy
) {
3926 rc
= ata_eh_set_lpm(link
, ap
->target_lpm_policy
, &dev
);
3931 /* this link is okay now */
3938 ata_eh_handle_dev_fail(dev
, rc
);
3940 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
3941 /* PMP reset requires working host port.
3942 * Can't retry if it's frozen.
3944 if (sata_pmp_attached(ap
))
3954 if (rc
&& r_failed_link
)
3955 *r_failed_link
= link
;
3957 DPRINTK("EXIT, rc=%d\n", rc
);
3962 * ata_eh_finish - finish up EH
3963 * @ap: host port to finish EH for
3965 * Recovery is complete. Clean up EH states and retry or finish
3971 void ata_eh_finish(struct ata_port
*ap
)
3975 /* retry or finish qcs */
3976 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
3977 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
3979 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
3983 /* FIXME: Once EH migration is complete,
3984 * generate sense data in this function,
3985 * considering both err_mask and tf.
3987 if (qc
->flags
& ATA_QCFLAG_RETRY
)
3988 ata_eh_qc_retry(qc
);
3990 ata_eh_qc_complete(qc
);
3992 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
3993 ata_eh_qc_complete(qc
);
3995 /* feed zero TF to sense generation */
3996 memset(&qc
->result_tf
, 0, sizeof(qc
->result_tf
));
3997 ata_eh_qc_retry(qc
);
4002 /* make sure nr_active_links is zero after EH */
4003 WARN_ON(ap
->nr_active_links
);
4004 ap
->nr_active_links
= 0;
4008 * ata_do_eh - do standard error handling
4009 * @ap: host port to handle error for
4011 * @prereset: prereset method (can be NULL)
4012 * @softreset: softreset method (can be NULL)
4013 * @hardreset: hardreset method (can be NULL)
4014 * @postreset: postreset method (can be NULL)
4016 * Perform standard error handling sequence.
4019 * Kernel thread context (may sleep).
4021 void ata_do_eh(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
4022 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
4023 ata_postreset_fn_t postreset
)
4025 struct ata_device
*dev
;
4031 rc
= ata_eh_recover(ap
, prereset
, softreset
, hardreset
, postreset
,
4034 ata_for_each_dev(dev
, &ap
->link
, ALL
)
4035 ata_dev_disable(dev
);
4042 * ata_std_error_handler - standard error handler
4043 * @ap: host port to handle error for
4045 * Standard error handler
4048 * Kernel thread context (may sleep).
4050 void ata_std_error_handler(struct ata_port
*ap
)
4052 struct ata_port_operations
*ops
= ap
->ops
;
4053 ata_reset_fn_t hardreset
= ops
->hardreset
;
4055 /* ignore built-in hardreset if SCR access is not available */
4056 if (hardreset
== sata_std_hardreset
&& !sata_scr_valid(&ap
->link
))
4059 ata_do_eh(ap
, ops
->prereset
, ops
->softreset
, hardreset
, ops
->postreset
);
4064 * ata_eh_handle_port_suspend - perform port suspend operation
4065 * @ap: port to suspend
4070 * Kernel thread context (may sleep).
4072 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
4074 unsigned long flags
;
4076 struct ata_device
*dev
;
4078 /* are we suspending? */
4079 spin_lock_irqsave(ap
->lock
, flags
);
4080 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
4081 ap
->pm_mesg
.event
& PM_EVENT_RESUME
) {
4082 spin_unlock_irqrestore(ap
->lock
, flags
);
4085 spin_unlock_irqrestore(ap
->lock
, flags
);
4087 WARN_ON(ap
->pflags
& ATA_PFLAG_SUSPENDED
);
4090 * If we have a ZPODD attached, check its zero
4091 * power ready status before the port is frozen.
4092 * Only needed for runtime suspend.
4094 if (PMSG_IS_AUTO(ap
->pm_mesg
)) {
4095 ata_for_each_dev(dev
, &ap
->link
, ENABLED
) {
4096 if (zpodd_dev_enabled(dev
))
4097 zpodd_on_suspend(dev
);
4101 /* tell ACPI we're suspending */
4102 rc
= ata_acpi_on_suspend(ap
);
4107 ata_eh_freeze_port(ap
);
4109 if (ap
->ops
->port_suspend
)
4110 rc
= ap
->ops
->port_suspend(ap
, ap
->pm_mesg
);
4112 ata_acpi_set_state(ap
, ap
->pm_mesg
);
4114 /* update the flags */
4115 spin_lock_irqsave(ap
->lock
, flags
);
4117 ap
->pflags
&= ~ATA_PFLAG_PM_PENDING
;
4119 ap
->pflags
|= ATA_PFLAG_SUSPENDED
;
4120 else if (ap
->pflags
& ATA_PFLAG_FROZEN
)
4121 ata_port_schedule_eh(ap
);
4123 spin_unlock_irqrestore(ap
->lock
, flags
);
4129 * ata_eh_handle_port_resume - perform port resume operation
4130 * @ap: port to resume
4135 * Kernel thread context (may sleep).
4137 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
4139 struct ata_link
*link
;
4140 struct ata_device
*dev
;
4141 unsigned long flags
;
4144 /* are we resuming? */
4145 spin_lock_irqsave(ap
->lock
, flags
);
4146 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
4147 !(ap
->pm_mesg
.event
& PM_EVENT_RESUME
)) {
4148 spin_unlock_irqrestore(ap
->lock
, flags
);
4151 spin_unlock_irqrestore(ap
->lock
, flags
);
4153 WARN_ON(!(ap
->pflags
& ATA_PFLAG_SUSPENDED
));
4156 * Error timestamps are in jiffies which doesn't run while
4157 * suspended and PHY events during resume isn't too uncommon.
4158 * When the two are combined, it can lead to unnecessary speed
4159 * downs if the machine is suspended and resumed repeatedly.
4160 * Clear error history.
4162 ata_for_each_link(link
, ap
, HOST_FIRST
)
4163 ata_for_each_dev(dev
, link
, ALL
)
4164 ata_ering_clear(&dev
->ering
);
4166 ata_acpi_set_state(ap
, ap
->pm_mesg
);
4168 if (ap
->ops
->port_resume
)
4169 rc
= ap
->ops
->port_resume(ap
);
4171 /* tell ACPI that we're resuming */
4172 ata_acpi_on_resume(ap
);
4174 /* update the flags */
4175 spin_lock_irqsave(ap
->lock
, flags
);
4176 ap
->pflags
&= ~(ATA_PFLAG_PM_PENDING
| ATA_PFLAG_SUSPENDED
);
4177 spin_unlock_irqrestore(ap
->lock
, flags
);
4179 #endif /* CONFIG_PM */