2 * libata-eh.c - libata error handling
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2006 Tejun Heo <htejun@gmail.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/kernel.h>
36 #include <linux/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>
52 /* speed down verdicts */
53 ATA_EH_SPDN_NCQ_OFF
= (1 << 0),
54 ATA_EH_SPDN_SPEED_DOWN
= (1 << 1),
55 ATA_EH_SPDN_FALLBACK_TO_PIO
= (1 << 2),
56 ATA_EH_SPDN_KEEP_ERRORS
= (1 << 3),
59 ATA_EFLAG_IS_IO
= (1 << 0),
60 ATA_EFLAG_DUBIOUS_XFER
= (1 << 1),
61 ATA_EFLAG_OLD_ER
= (1 << 31),
63 /* error categories */
66 ATA_ECAT_TOUT_HSM
= 2,
68 ATA_ECAT_DUBIOUS_NONE
= 4,
69 ATA_ECAT_DUBIOUS_ATA_BUS
= 5,
70 ATA_ECAT_DUBIOUS_TOUT_HSM
= 6,
71 ATA_ECAT_DUBIOUS_UNK_DEV
= 7,
74 ATA_EH_CMD_DFL_TIMEOUT
= 5000,
76 /* always put at least this amount of time between resets */
77 ATA_EH_RESET_COOL_DOWN
= 5000,
79 /* Waiting in ->prereset can never be reliable. It's
80 * sometimes nice to wait there but it can't be depended upon;
81 * otherwise, we wouldn't be resetting. Just give it enough
82 * time for most drives to spin up.
84 ATA_EH_PRERESET_TIMEOUT
= 10000,
85 ATA_EH_FASTDRAIN_INTERVAL
= 3000,
89 /* probe speed down parameters, see ata_eh_schedule_probe() */
90 ATA_EH_PROBE_TRIAL_INTERVAL
= 60000, /* 1 min */
91 ATA_EH_PROBE_TRIALS
= 2,
94 /* The following table determines how we sequence resets. Each entry
95 * represents timeout for that try. The first try can be soft or
96 * hardreset. All others are hardreset if available. In most cases
97 * the first reset w/ 10sec timeout should succeed. Following entries
98 * are mostly for error handling, hotplug and retarded devices.
100 static const unsigned long ata_eh_reset_timeouts
[] = {
101 10000, /* most drives spin up by 10sec */
102 10000, /* > 99% working drives spin up before 20sec */
103 35000, /* give > 30 secs of idleness for retarded devices */
104 5000, /* and sweet one last chance */
105 ULONG_MAX
, /* > 1 min has elapsed, give up */
108 static const unsigned long ata_eh_identify_timeouts
[] = {
109 5000, /* covers > 99% of successes and not too boring on failures */
110 10000, /* combined time till here is enough even for media access */
111 30000, /* for true idiots */
115 static const unsigned long ata_eh_flush_timeouts
[] = {
116 15000, /* be generous with flush */
118 30000, /* and even more generous */
122 static const unsigned long ata_eh_other_timeouts
[] = {
123 5000, /* same rationale as identify timeout */
125 /* but no merciful 30sec for other commands, it just isn't worth it */
129 struct ata_eh_cmd_timeout_ent
{
131 const unsigned long *timeouts
;
134 /* The following table determines timeouts to use for EH internal
135 * commands. Each table entry is a command class and matches the
136 * commands the entry applies to and the timeout table to use.
138 * On the retry after a command timed out, the next timeout value from
139 * the table is used. If the table doesn't contain further entries,
140 * the last value is used.
142 * ehc->cmd_timeout_idx keeps track of which timeout to use per
143 * command class, so if SET_FEATURES times out on the first try, the
144 * next try will use the second timeout value only for that class.
146 #define CMDS(cmds...) (const u8 []){ cmds, 0 }
147 static const struct ata_eh_cmd_timeout_ent
148 ata_eh_cmd_timeout_table
[ATA_EH_CMD_TIMEOUT_TABLE_SIZE
] = {
149 { .commands
= CMDS(ATA_CMD_ID_ATA
, ATA_CMD_ID_ATAPI
),
150 .timeouts
= ata_eh_identify_timeouts
, },
151 { .commands
= CMDS(ATA_CMD_READ_NATIVE_MAX
, ATA_CMD_READ_NATIVE_MAX_EXT
),
152 .timeouts
= ata_eh_other_timeouts
, },
153 { .commands
= CMDS(ATA_CMD_SET_MAX
, ATA_CMD_SET_MAX_EXT
),
154 .timeouts
= ata_eh_other_timeouts
, },
155 { .commands
= CMDS(ATA_CMD_SET_FEATURES
),
156 .timeouts
= ata_eh_other_timeouts
, },
157 { .commands
= CMDS(ATA_CMD_INIT_DEV_PARAMS
),
158 .timeouts
= ata_eh_other_timeouts
, },
159 { .commands
= CMDS(ATA_CMD_FLUSH
, ATA_CMD_FLUSH_EXT
),
160 .timeouts
= ata_eh_flush_timeouts
},
164 static void __ata_port_freeze(struct ata_port
*ap
);
166 static void ata_eh_handle_port_suspend(struct ata_port
*ap
);
167 static void ata_eh_handle_port_resume(struct ata_port
*ap
);
168 #else /* CONFIG_PM */
169 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
172 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
174 #endif /* CONFIG_PM */
176 static void __ata_ehi_pushv_desc(struct ata_eh_info
*ehi
, const char *fmt
,
179 ehi
->desc_len
+= vscnprintf(ehi
->desc
+ ehi
->desc_len
,
180 ATA_EH_DESC_LEN
- ehi
->desc_len
,
185 * __ata_ehi_push_desc - push error description without adding separator
187 * @fmt: printf format string
189 * Format string according to @fmt and append it to @ehi->desc.
192 * spin_lock_irqsave(host lock)
194 void __ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
199 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
204 * ata_ehi_push_desc - push error description with separator
206 * @fmt: printf format string
208 * Format string according to @fmt and append it to @ehi->desc.
209 * If @ehi->desc is not empty, ", " is added in-between.
212 * spin_lock_irqsave(host lock)
214 void ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
219 __ata_ehi_push_desc(ehi
, ", ");
222 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
227 * ata_ehi_clear_desc - clean error description
233 * spin_lock_irqsave(host lock)
235 void ata_ehi_clear_desc(struct ata_eh_info
*ehi
)
242 * ata_port_desc - append port description
243 * @ap: target ATA port
244 * @fmt: printf format string
246 * Format string according to @fmt and append it to port
247 * description. If port description is not empty, " " is added
248 * in-between. This function is to be used while initializing
249 * ata_host. The description is printed on host registration.
254 void ata_port_desc(struct ata_port
*ap
, const char *fmt
, ...)
258 WARN_ON(!(ap
->pflags
& ATA_PFLAG_INITIALIZING
));
260 if (ap
->link
.eh_info
.desc_len
)
261 __ata_ehi_push_desc(&ap
->link
.eh_info
, " ");
264 __ata_ehi_pushv_desc(&ap
->link
.eh_info
, fmt
, args
);
271 * ata_port_pbar_desc - append PCI BAR description
272 * @ap: target ATA port
273 * @bar: target PCI BAR
274 * @offset: offset into PCI BAR
275 * @name: name of the area
277 * If @offset is negative, this function formats a string which
278 * contains the name, address, size and type of the BAR and
279 * appends it to the port description. If @offset is zero or
280 * positive, only name and offsetted address is appended.
285 void ata_port_pbar_desc(struct ata_port
*ap
, int bar
, ssize_t offset
,
288 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
290 unsigned long long start
, len
;
292 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
294 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
297 start
= (unsigned long long)pci_resource_start(pdev
, bar
);
298 len
= (unsigned long long)pci_resource_len(pdev
, bar
);
301 ata_port_desc(ap
, "%s %s%llu@0x%llx", name
, type
, len
, start
);
303 ata_port_desc(ap
, "%s 0x%llx", name
,
304 start
+ (unsigned long long)offset
);
307 #endif /* CONFIG_PCI */
309 static int ata_lookup_timeout_table(u8 cmd
)
313 for (i
= 0; i
< ATA_EH_CMD_TIMEOUT_TABLE_SIZE
; i
++) {
316 for (cur
= ata_eh_cmd_timeout_table
[i
].commands
; *cur
; cur
++)
325 * ata_internal_cmd_timeout - determine timeout for an internal command
326 * @dev: target device
327 * @cmd: internal command to be issued
329 * Determine timeout for internal command @cmd for @dev.
335 * Determined timeout.
337 unsigned long ata_internal_cmd_timeout(struct ata_device
*dev
, u8 cmd
)
339 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
340 int ent
= ata_lookup_timeout_table(cmd
);
344 return ATA_EH_CMD_DFL_TIMEOUT
;
346 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
347 return ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
];
351 * ata_internal_cmd_timed_out - notification for internal command timeout
352 * @dev: target device
353 * @cmd: internal command which timed out
355 * Notify EH that internal command @cmd for @dev timed out. This
356 * function should be called only for commands whose timeouts are
357 * determined using ata_internal_cmd_timeout().
362 void ata_internal_cmd_timed_out(struct ata_device
*dev
, u8 cmd
)
364 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
365 int ent
= ata_lookup_timeout_table(cmd
);
371 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
372 if (ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
+ 1] != ULONG_MAX
)
373 ehc
->cmd_timeout_idx
[dev
->devno
][ent
]++;
376 static void ata_ering_record(struct ata_ering
*ering
, unsigned int eflags
,
377 unsigned int err_mask
)
379 struct ata_ering_entry
*ent
;
384 ering
->cursor
%= ATA_ERING_SIZE
;
386 ent
= &ering
->ring
[ering
->cursor
];
387 ent
->eflags
= eflags
;
388 ent
->err_mask
= err_mask
;
389 ent
->timestamp
= get_jiffies_64();
392 static struct ata_ering_entry
*ata_ering_top(struct ata_ering
*ering
)
394 struct ata_ering_entry
*ent
= &ering
->ring
[ering
->cursor
];
401 int ata_ering_map(struct ata_ering
*ering
,
402 int (*map_fn
)(struct ata_ering_entry
*, void *),
406 struct ata_ering_entry
*ent
;
410 ent
= &ering
->ring
[idx
];
413 rc
= map_fn(ent
, arg
);
416 idx
= (idx
- 1 + ATA_ERING_SIZE
) % ATA_ERING_SIZE
;
417 } while (idx
!= ering
->cursor
);
422 int ata_ering_clear_cb(struct ata_ering_entry
*ent
, void *void_arg
)
424 ent
->eflags
|= ATA_EFLAG_OLD_ER
;
428 static void ata_ering_clear(struct ata_ering
*ering
)
430 ata_ering_map(ering
, ata_ering_clear_cb
, NULL
);
433 static unsigned int ata_eh_dev_action(struct ata_device
*dev
)
435 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
437 return ehc
->i
.action
| ehc
->i
.dev_action
[dev
->devno
];
440 static void ata_eh_clear_action(struct ata_link
*link
, struct ata_device
*dev
,
441 struct ata_eh_info
*ehi
, unsigned int action
)
443 struct ata_device
*tdev
;
446 ehi
->action
&= ~action
;
447 ata_for_each_dev(tdev
, link
, ALL
)
448 ehi
->dev_action
[tdev
->devno
] &= ~action
;
450 /* doesn't make sense for port-wide EH actions */
451 WARN_ON(!(action
& ATA_EH_PERDEV_MASK
));
453 /* break ehi->action into ehi->dev_action */
454 if (ehi
->action
& action
) {
455 ata_for_each_dev(tdev
, link
, ALL
)
456 ehi
->dev_action
[tdev
->devno
] |=
457 ehi
->action
& action
;
458 ehi
->action
&= ~action
;
461 /* turn off the specified per-dev action */
462 ehi
->dev_action
[dev
->devno
] &= ~action
;
467 * ata_eh_acquire - acquire EH ownership
468 * @ap: ATA port to acquire EH ownership for
470 * Acquire EH ownership for @ap. This is the basic exclusion
471 * mechanism for ports sharing a host. Only one port hanging off
472 * the same host can claim the ownership of EH.
477 void ata_eh_acquire(struct ata_port
*ap
)
479 mutex_lock(&ap
->host
->eh_mutex
);
480 WARN_ON_ONCE(ap
->host
->eh_owner
);
481 ap
->host
->eh_owner
= current
;
485 * ata_eh_release - release EH ownership
486 * @ap: ATA port to release EH ownership for
488 * Release EH ownership for @ap if the caller. The caller must
489 * have acquired EH ownership using ata_eh_acquire() previously.
494 void ata_eh_release(struct ata_port
*ap
)
496 WARN_ON_ONCE(ap
->host
->eh_owner
!= current
);
497 ap
->host
->eh_owner
= NULL
;
498 mutex_unlock(&ap
->host
->eh_mutex
);
502 * ata_scsi_timed_out - SCSI layer time out callback
503 * @cmd: timed out SCSI command
505 * Handles SCSI layer timeout. We race with normal completion of
506 * the qc for @cmd. If the qc is already gone, we lose and let
507 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
508 * timed out and EH should be invoked. Prevent ata_qc_complete()
509 * from finishing it by setting EH_SCHEDULED and return
512 * TODO: kill this function once old EH is gone.
515 * Called from timer context
518 * EH_HANDLED or EH_NOT_HANDLED
520 enum blk_eh_timer_return
ata_scsi_timed_out(struct scsi_cmnd
*cmd
)
522 struct Scsi_Host
*host
= cmd
->device
->host
;
523 struct ata_port
*ap
= ata_shost_to_port(host
);
525 struct ata_queued_cmd
*qc
;
526 enum blk_eh_timer_return ret
;
530 if (ap
->ops
->error_handler
) {
531 ret
= BLK_EH_NOT_HANDLED
;
535 ret
= BLK_EH_HANDLED
;
536 spin_lock_irqsave(ap
->lock
, flags
);
537 qc
= ata_qc_from_tag(ap
, ap
->link
.active_tag
);
539 WARN_ON(qc
->scsicmd
!= cmd
);
540 qc
->flags
|= ATA_QCFLAG_EH_SCHEDULED
;
541 qc
->err_mask
|= AC_ERR_TIMEOUT
;
542 ret
= BLK_EH_NOT_HANDLED
;
544 spin_unlock_irqrestore(ap
->lock
, flags
);
547 DPRINTK("EXIT, ret=%d\n", ret
);
551 static void ata_eh_unload(struct ata_port
*ap
)
553 struct ata_link
*link
;
554 struct ata_device
*dev
;
557 /* Restore SControl IPM and SPD for the next driver and
558 * disable attached devices.
560 ata_for_each_link(link
, ap
, PMP_FIRST
) {
561 sata_scr_write(link
, SCR_CONTROL
, link
->saved_scontrol
& 0xff0);
562 ata_for_each_dev(dev
, link
, ALL
)
563 ata_dev_disable(dev
);
566 /* freeze and set UNLOADED */
567 spin_lock_irqsave(ap
->lock
, flags
);
569 ata_port_freeze(ap
); /* won't be thawed */
570 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
; /* clear pending from freeze */
571 ap
->pflags
|= ATA_PFLAG_UNLOADED
;
573 spin_unlock_irqrestore(ap
->lock
, flags
);
577 * ata_scsi_error - SCSI layer error handler callback
578 * @host: SCSI host on which error occurred
580 * Handles SCSI-layer-thrown error events.
583 * Inherited from SCSI layer (none, can sleep)
588 void ata_scsi_error(struct Scsi_Host
*host
)
590 struct ata_port
*ap
= ata_shost_to_port(host
);
592 LIST_HEAD(eh_work_q
);
596 spin_lock_irqsave(host
->host_lock
, flags
);
597 list_splice_init(&host
->eh_cmd_q
, &eh_work_q
);
598 spin_unlock_irqrestore(host
->host_lock
, flags
);
600 ata_scsi_cmd_error_handler(host
, ap
, &eh_work_q
);
602 /* If we timed raced normal completion and there is nothing to
603 recover nr_timedout == 0 why exactly are we doing error recovery ? */
604 ata_scsi_port_error_handler(host
, ap
);
606 /* finish or retry handled scmd's and clean up */
607 WARN_ON(host
->host_failed
|| !list_empty(&eh_work_q
));
613 * ata_scsi_cmd_error_handler - error callback for a list of commands
614 * @host: scsi host containing the port
615 * @ap: ATA port within the host
616 * @eh_work_q: list of commands to process
618 * process the given list of commands and return those finished to the
619 * ap->eh_done_q. This function is the first part of the libata error
620 * handler which processes a given list of failed commands.
622 void ata_scsi_cmd_error_handler(struct Scsi_Host
*host
, struct ata_port
*ap
,
623 struct list_head
*eh_work_q
)
628 /* make sure sff pio task is not running */
629 ata_sff_flush_pio_task(ap
);
631 /* synchronize with host lock and sort out timeouts */
633 /* For new EH, all qcs are finished in one of three ways -
634 * normal completion, error completion, and SCSI timeout.
635 * Both completions can race against SCSI timeout. When normal
636 * completion wins, the qc never reaches EH. When error
637 * completion wins, the qc has ATA_QCFLAG_FAILED set.
639 * When SCSI timeout wins, things are a bit more complex.
640 * Normal or error completion can occur after the timeout but
641 * before this point. In such cases, both types of
642 * completions are honored. A scmd is determined to have
643 * timed out iff its associated qc is active and not failed.
645 if (ap
->ops
->error_handler
) {
646 struct scsi_cmnd
*scmd
, *tmp
;
649 spin_lock_irqsave(ap
->lock
, flags
);
651 /* This must occur under the ap->lock as we don't want
652 a polled recovery to race the real interrupt handler
654 The lost_interrupt handler checks for any completed but
655 non-notified command and completes much like an IRQ handler.
657 We then fall into the error recovery code which will treat
658 this as if normal completion won the race */
660 if (ap
->ops
->lost_interrupt
)
661 ap
->ops
->lost_interrupt(ap
);
663 list_for_each_entry_safe(scmd
, tmp
, eh_work_q
, eh_entry
) {
664 struct ata_queued_cmd
*qc
;
666 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
667 qc
= __ata_qc_from_tag(ap
, i
);
668 if (qc
->flags
& ATA_QCFLAG_ACTIVE
&&
673 if (i
< ATA_MAX_QUEUE
) {
674 /* the scmd has an associated qc */
675 if (!(qc
->flags
& ATA_QCFLAG_FAILED
)) {
676 /* which hasn't failed yet, timeout */
677 qc
->err_mask
|= AC_ERR_TIMEOUT
;
678 qc
->flags
|= ATA_QCFLAG_FAILED
;
682 /* Normal completion occurred after
683 * SCSI timeout but before this point.
684 * Successfully complete it.
686 scmd
->retries
= scmd
->allowed
;
687 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
691 /* If we have timed out qcs. They belong to EH from
692 * this point but the state of the controller is
693 * unknown. Freeze the port to make sure the IRQ
694 * handler doesn't diddle with those qcs. This must
695 * be done atomically w.r.t. setting QCFLAG_FAILED.
698 __ata_port_freeze(ap
);
700 spin_unlock_irqrestore(ap
->lock
, flags
);
702 /* initialize eh_tries */
703 ap
->eh_tries
= ATA_EH_MAX_TRIES
;
705 spin_unlock_wait(ap
->lock
);
708 EXPORT_SYMBOL(ata_scsi_cmd_error_handler
);
711 * ata_scsi_port_error_handler - recover the port after the commands
712 * @host: SCSI host containing the port
715 * Handle the recovery of the port @ap after all the commands
716 * have been recovered.
718 void ata_scsi_port_error_handler(struct Scsi_Host
*host
, struct ata_port
*ap
)
722 /* invoke error handler */
723 if (ap
->ops
->error_handler
) {
724 struct ata_link
*link
;
726 /* acquire EH ownership */
729 /* kill fast drain timer */
730 del_timer_sync(&ap
->fastdrain_timer
);
732 /* process port resume request */
733 ata_eh_handle_port_resume(ap
);
735 /* fetch & clear EH info */
736 spin_lock_irqsave(ap
->lock
, flags
);
738 ata_for_each_link(link
, ap
, HOST_FIRST
) {
739 struct ata_eh_context
*ehc
= &link
->eh_context
;
740 struct ata_device
*dev
;
742 memset(&link
->eh_context
, 0, sizeof(link
->eh_context
));
743 link
->eh_context
.i
= link
->eh_info
;
744 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
746 ata_for_each_dev(dev
, link
, ENABLED
) {
747 int devno
= dev
->devno
;
749 ehc
->saved_xfer_mode
[devno
] = dev
->xfer_mode
;
750 if (ata_ncq_enabled(dev
))
751 ehc
->saved_ncq_enabled
|= 1 << devno
;
755 ap
->pflags
|= ATA_PFLAG_EH_IN_PROGRESS
;
756 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
757 ap
->excl_link
= NULL
; /* don't maintain exclusion over EH */
759 spin_unlock_irqrestore(ap
->lock
, flags
);
761 /* invoke EH, skip if unloading or suspended */
762 if (!(ap
->pflags
& (ATA_PFLAG_UNLOADING
| ATA_PFLAG_SUSPENDED
)))
763 ap
->ops
->error_handler(ap
);
765 /* if unloading, commence suicide */
766 if ((ap
->pflags
& ATA_PFLAG_UNLOADING
) &&
767 !(ap
->pflags
& ATA_PFLAG_UNLOADED
))
772 /* process port suspend request */
773 ata_eh_handle_port_suspend(ap
);
775 /* Exception might have happened after ->error_handler
776 * recovered the port but before this point. Repeat
779 spin_lock_irqsave(ap
->lock
, flags
);
781 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
) {
782 if (--ap
->eh_tries
) {
783 spin_unlock_irqrestore(ap
->lock
, flags
);
787 "EH pending after %d tries, giving up\n",
789 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
792 /* this run is complete, make sure EH info is clear */
793 ata_for_each_link(link
, ap
, HOST_FIRST
)
794 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
796 /* Clear host_eh_scheduled while holding ap->lock such
797 * that if exception occurs after this point but
798 * before EH completion, SCSI midlayer will
801 host
->host_eh_scheduled
= 0;
803 spin_unlock_irqrestore(ap
->lock
, flags
);
806 WARN_ON(ata_qc_from_tag(ap
, ap
->link
.active_tag
) == NULL
);
807 ap
->ops
->eng_timeout(ap
);
810 scsi_eh_flush_done_q(&ap
->eh_done_q
);
813 spin_lock_irqsave(ap
->lock
, flags
);
815 if (ap
->pflags
& ATA_PFLAG_LOADING
)
816 ap
->pflags
&= ~ATA_PFLAG_LOADING
;
817 else if (ap
->pflags
& ATA_PFLAG_SCSI_HOTPLUG
)
818 schedule_delayed_work(&ap
->hotplug_task
, 0);
820 if (ap
->pflags
& ATA_PFLAG_RECOVERED
)
821 ata_port_info(ap
, "EH complete\n");
823 ap
->pflags
&= ~(ATA_PFLAG_SCSI_HOTPLUG
| ATA_PFLAG_RECOVERED
);
825 /* tell wait_eh that we're done */
826 ap
->pflags
&= ~ATA_PFLAG_EH_IN_PROGRESS
;
827 wake_up_all(&ap
->eh_wait_q
);
829 spin_unlock_irqrestore(ap
->lock
, flags
);
831 EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler
);
834 * ata_port_wait_eh - Wait for the currently pending EH to complete
835 * @ap: Port to wait EH for
837 * Wait until the currently pending EH is complete.
840 * Kernel thread context (may sleep).
842 void ata_port_wait_eh(struct ata_port
*ap
)
848 spin_lock_irqsave(ap
->lock
, flags
);
850 while (ap
->pflags
& (ATA_PFLAG_EH_PENDING
| ATA_PFLAG_EH_IN_PROGRESS
)) {
851 prepare_to_wait(&ap
->eh_wait_q
, &wait
, TASK_UNINTERRUPTIBLE
);
852 spin_unlock_irqrestore(ap
->lock
, flags
);
854 spin_lock_irqsave(ap
->lock
, flags
);
856 finish_wait(&ap
->eh_wait_q
, &wait
);
858 spin_unlock_irqrestore(ap
->lock
, flags
);
860 /* make sure SCSI EH is complete */
861 if (scsi_host_in_recovery(ap
->scsi_host
)) {
866 EXPORT_SYMBOL_GPL(ata_port_wait_eh
);
868 static int ata_eh_nr_in_flight(struct ata_port
*ap
)
873 /* count only non-internal commands */
874 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++)
875 if (ata_qc_from_tag(ap
, tag
))
881 void ata_eh_fastdrain_timerfn(unsigned long arg
)
883 struct ata_port
*ap
= (void *)arg
;
887 spin_lock_irqsave(ap
->lock
, flags
);
889 cnt
= ata_eh_nr_in_flight(ap
);
895 if (cnt
== ap
->fastdrain_cnt
) {
898 /* No progress during the last interval, tag all
899 * in-flight qcs as timed out and freeze the port.
901 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++) {
902 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
904 qc
->err_mask
|= AC_ERR_TIMEOUT
;
909 /* some qcs have finished, give it another chance */
910 ap
->fastdrain_cnt
= cnt
;
911 ap
->fastdrain_timer
.expires
=
912 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
913 add_timer(&ap
->fastdrain_timer
);
917 spin_unlock_irqrestore(ap
->lock
, flags
);
921 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
922 * @ap: target ATA port
923 * @fastdrain: activate fast drain
925 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
926 * is non-zero and EH wasn't pending before. Fast drain ensures
927 * that EH kicks in in timely manner.
930 * spin_lock_irqsave(host lock)
932 static void ata_eh_set_pending(struct ata_port
*ap
, int fastdrain
)
936 /* already scheduled? */
937 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
)
940 ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
945 /* do we have in-flight qcs? */
946 cnt
= ata_eh_nr_in_flight(ap
);
950 /* activate fast drain */
951 ap
->fastdrain_cnt
= cnt
;
952 ap
->fastdrain_timer
.expires
=
953 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
954 add_timer(&ap
->fastdrain_timer
);
958 * ata_qc_schedule_eh - schedule qc for error handling
959 * @qc: command to schedule error handling for
961 * Schedule error handling for @qc. EH will kick in as soon as
962 * other commands are drained.
965 * spin_lock_irqsave(host lock)
967 void ata_qc_schedule_eh(struct ata_queued_cmd
*qc
)
969 struct ata_port
*ap
= qc
->ap
;
970 struct request_queue
*q
= qc
->scsicmd
->device
->request_queue
;
973 WARN_ON(!ap
->ops
->error_handler
);
975 qc
->flags
|= ATA_QCFLAG_FAILED
;
976 ata_eh_set_pending(ap
, 1);
978 /* The following will fail if timeout has already expired.
979 * ata_scsi_error() takes care of such scmds on EH entry.
980 * Note that ATA_QCFLAG_FAILED is unconditionally set after
981 * this function completes.
983 spin_lock_irqsave(q
->queue_lock
, flags
);
984 blk_abort_request(qc
->scsicmd
->request
);
985 spin_unlock_irqrestore(q
->queue_lock
, flags
);
989 * ata_port_schedule_eh - schedule error handling without a qc
990 * @ap: ATA port to schedule EH for
992 * Schedule error handling for @ap. EH will kick in as soon as
993 * all commands are drained.
996 * spin_lock_irqsave(host lock)
998 void ata_port_schedule_eh(struct ata_port
*ap
)
1000 WARN_ON(!ap
->ops
->error_handler
);
1002 if (ap
->pflags
& ATA_PFLAG_INITIALIZING
)
1005 ata_eh_set_pending(ap
, 1);
1006 scsi_schedule_eh(ap
->scsi_host
);
1008 DPRINTK("port EH scheduled\n");
1011 static int ata_do_link_abort(struct ata_port
*ap
, struct ata_link
*link
)
1013 int tag
, nr_aborted
= 0;
1015 WARN_ON(!ap
->ops
->error_handler
);
1017 /* we're gonna abort all commands, no need for fast drain */
1018 ata_eh_set_pending(ap
, 0);
1020 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1021 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
1023 if (qc
&& (!link
|| qc
->dev
->link
== link
)) {
1024 qc
->flags
|= ATA_QCFLAG_FAILED
;
1025 ata_qc_complete(qc
);
1031 ata_port_schedule_eh(ap
);
1037 * ata_link_abort - abort all qc's on the link
1038 * @link: ATA link to abort qc's for
1040 * Abort all active qc's active on @link and schedule EH.
1043 * spin_lock_irqsave(host lock)
1046 * Number of aborted qc's.
1048 int ata_link_abort(struct ata_link
*link
)
1050 return ata_do_link_abort(link
->ap
, link
);
1054 * ata_port_abort - abort all qc's on the port
1055 * @ap: ATA port to abort qc's for
1057 * Abort all active qc's of @ap and schedule EH.
1060 * spin_lock_irqsave(host_set lock)
1063 * Number of aborted qc's.
1065 int ata_port_abort(struct ata_port
*ap
)
1067 return ata_do_link_abort(ap
, NULL
);
1071 * __ata_port_freeze - freeze port
1072 * @ap: ATA port to freeze
1074 * This function is called when HSM violation or some other
1075 * condition disrupts normal operation of the port. Frozen port
1076 * is not allowed to perform any operation until the port is
1077 * thawed, which usually follows a successful reset.
1079 * ap->ops->freeze() callback can be used for freezing the port
1080 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1081 * port cannot be frozen hardware-wise, the interrupt handler
1082 * must ack and clear interrupts unconditionally while the port
1086 * spin_lock_irqsave(host lock)
1088 static void __ata_port_freeze(struct ata_port
*ap
)
1090 WARN_ON(!ap
->ops
->error_handler
);
1092 if (ap
->ops
->freeze
)
1093 ap
->ops
->freeze(ap
);
1095 ap
->pflags
|= ATA_PFLAG_FROZEN
;
1097 DPRINTK("ata%u port frozen\n", ap
->print_id
);
1101 * ata_port_freeze - abort & freeze port
1102 * @ap: ATA port to freeze
1104 * Abort and freeze @ap. The freeze operation must be called
1105 * first, because some hardware requires special operations
1106 * before the taskfile registers are accessible.
1109 * spin_lock_irqsave(host lock)
1112 * Number of aborted commands.
1114 int ata_port_freeze(struct ata_port
*ap
)
1118 WARN_ON(!ap
->ops
->error_handler
);
1120 __ata_port_freeze(ap
);
1121 nr_aborted
= ata_port_abort(ap
);
1127 * sata_async_notification - SATA async notification handler
1128 * @ap: ATA port where async notification is received
1130 * Handler to be called when async notification via SDB FIS is
1131 * received. This function schedules EH if necessary.
1134 * spin_lock_irqsave(host lock)
1137 * 1 if EH is scheduled, 0 otherwise.
1139 int sata_async_notification(struct ata_port
*ap
)
1144 if (!(ap
->flags
& ATA_FLAG_AN
))
1147 rc
= sata_scr_read(&ap
->link
, SCR_NOTIFICATION
, &sntf
);
1149 sata_scr_write(&ap
->link
, SCR_NOTIFICATION
, sntf
);
1151 if (!sata_pmp_attached(ap
) || rc
) {
1152 /* PMP is not attached or SNTF is not available */
1153 if (!sata_pmp_attached(ap
)) {
1154 /* PMP is not attached. Check whether ATAPI
1155 * AN is configured. If so, notify media
1158 struct ata_device
*dev
= ap
->link
.device
;
1160 if ((dev
->class == ATA_DEV_ATAPI
) &&
1161 (dev
->flags
& ATA_DFLAG_AN
))
1162 ata_scsi_media_change_notify(dev
);
1165 /* PMP is attached but SNTF is not available.
1166 * ATAPI async media change notification is
1167 * not used. The PMP must be reporting PHY
1168 * status change, schedule EH.
1170 ata_port_schedule_eh(ap
);
1174 /* PMP is attached and SNTF is available */
1175 struct ata_link
*link
;
1177 /* check and notify ATAPI AN */
1178 ata_for_each_link(link
, ap
, EDGE
) {
1179 if (!(sntf
& (1 << link
->pmp
)))
1182 if ((link
->device
->class == ATA_DEV_ATAPI
) &&
1183 (link
->device
->flags
& ATA_DFLAG_AN
))
1184 ata_scsi_media_change_notify(link
->device
);
1187 /* If PMP is reporting that PHY status of some
1188 * downstream ports has changed, schedule EH.
1190 if (sntf
& (1 << SATA_PMP_CTRL_PORT
)) {
1191 ata_port_schedule_eh(ap
);
1200 * ata_eh_freeze_port - EH helper to freeze port
1201 * @ap: ATA port to freeze
1208 void ata_eh_freeze_port(struct ata_port
*ap
)
1210 unsigned long flags
;
1212 if (!ap
->ops
->error_handler
)
1215 spin_lock_irqsave(ap
->lock
, flags
);
1216 __ata_port_freeze(ap
);
1217 spin_unlock_irqrestore(ap
->lock
, flags
);
1221 * ata_port_thaw_port - EH helper to thaw port
1222 * @ap: ATA port to thaw
1224 * Thaw frozen port @ap.
1229 void ata_eh_thaw_port(struct ata_port
*ap
)
1231 unsigned long flags
;
1233 if (!ap
->ops
->error_handler
)
1236 spin_lock_irqsave(ap
->lock
, flags
);
1238 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
1243 spin_unlock_irqrestore(ap
->lock
, flags
);
1245 DPRINTK("ata%u port thawed\n", ap
->print_id
);
1248 static void ata_eh_scsidone(struct scsi_cmnd
*scmd
)
1253 static void __ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1255 struct ata_port
*ap
= qc
->ap
;
1256 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1257 unsigned long flags
;
1259 spin_lock_irqsave(ap
->lock
, flags
);
1260 qc
->scsidone
= ata_eh_scsidone
;
1261 __ata_qc_complete(qc
);
1262 WARN_ON(ata_tag_valid(qc
->tag
));
1263 spin_unlock_irqrestore(ap
->lock
, flags
);
1265 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
1269 * ata_eh_qc_complete - Complete an active ATA command from EH
1270 * @qc: Command to complete
1272 * Indicate to the mid and upper layers that an ATA command has
1273 * completed. To be used from EH.
1275 void ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1277 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1278 scmd
->retries
= scmd
->allowed
;
1279 __ata_eh_qc_complete(qc
);
1283 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1284 * @qc: Command to retry
1286 * Indicate to the mid and upper layers that an ATA command
1287 * should be retried. To be used from EH.
1289 * SCSI midlayer limits the number of retries to scmd->allowed.
1290 * scmd->retries is decremented for commands which get retried
1291 * due to unrelated failures (qc->err_mask is zero).
1293 void ata_eh_qc_retry(struct ata_queued_cmd
*qc
)
1295 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1296 if (!qc
->err_mask
&& scmd
->retries
)
1298 __ata_eh_qc_complete(qc
);
1302 * ata_dev_disable - disable ATA device
1303 * @dev: ATA device to disable
1310 void ata_dev_disable(struct ata_device
*dev
)
1312 if (!ata_dev_enabled(dev
))
1315 if (ata_msg_drv(dev
->link
->ap
))
1316 ata_dev_warn(dev
, "disabled\n");
1317 ata_acpi_on_disable(dev
);
1318 ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO0
| ATA_DNXFER_QUIET
);
1321 /* From now till the next successful probe, ering is used to
1322 * track probe failures. Clear accumulated device error info.
1324 ata_ering_clear(&dev
->ering
);
1328 * ata_eh_detach_dev - detach ATA device
1329 * @dev: ATA device to detach
1336 void ata_eh_detach_dev(struct ata_device
*dev
)
1338 struct ata_link
*link
= dev
->link
;
1339 struct ata_port
*ap
= link
->ap
;
1340 struct ata_eh_context
*ehc
= &link
->eh_context
;
1341 unsigned long flags
;
1343 ata_dev_disable(dev
);
1345 spin_lock_irqsave(ap
->lock
, flags
);
1347 dev
->flags
&= ~ATA_DFLAG_DETACH
;
1349 if (ata_scsi_offline_dev(dev
)) {
1350 dev
->flags
|= ATA_DFLAG_DETACHED
;
1351 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
1354 /* clear per-dev EH info */
1355 ata_eh_clear_action(link
, dev
, &link
->eh_info
, ATA_EH_PERDEV_MASK
);
1356 ata_eh_clear_action(link
, dev
, &link
->eh_context
.i
, ATA_EH_PERDEV_MASK
);
1357 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
1358 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
1360 spin_unlock_irqrestore(ap
->lock
, flags
);
1364 * ata_eh_about_to_do - about to perform eh_action
1365 * @link: target ATA link
1366 * @dev: target ATA dev for per-dev action (can be NULL)
1367 * @action: action about to be performed
1369 * Called just before performing EH actions to clear related bits
1370 * in @link->eh_info such that eh actions are not unnecessarily
1376 void ata_eh_about_to_do(struct ata_link
*link
, struct ata_device
*dev
,
1377 unsigned int action
)
1379 struct ata_port
*ap
= link
->ap
;
1380 struct ata_eh_info
*ehi
= &link
->eh_info
;
1381 struct ata_eh_context
*ehc
= &link
->eh_context
;
1382 unsigned long flags
;
1384 spin_lock_irqsave(ap
->lock
, flags
);
1386 ata_eh_clear_action(link
, dev
, ehi
, action
);
1388 /* About to take EH action, set RECOVERED. Ignore actions on
1389 * slave links as master will do them again.
1391 if (!(ehc
->i
.flags
& ATA_EHI_QUIET
) && link
!= ap
->slave_link
)
1392 ap
->pflags
|= ATA_PFLAG_RECOVERED
;
1394 spin_unlock_irqrestore(ap
->lock
, flags
);
1398 * ata_eh_done - EH action complete
1399 * @ap: target ATA port
1400 * @dev: target ATA dev for per-dev action (can be NULL)
1401 * @action: action just completed
1403 * Called right after performing EH actions to clear related bits
1404 * in @link->eh_context.
1409 void ata_eh_done(struct ata_link
*link
, struct ata_device
*dev
,
1410 unsigned int action
)
1412 struct ata_eh_context
*ehc
= &link
->eh_context
;
1414 ata_eh_clear_action(link
, dev
, &ehc
->i
, action
);
1418 * ata_err_string - convert err_mask to descriptive string
1419 * @err_mask: error mask to convert to string
1421 * Convert @err_mask to descriptive string. Errors are
1422 * prioritized according to severity and only the most severe
1423 * error is reported.
1429 * Descriptive string for @err_mask
1431 static const char *ata_err_string(unsigned int err_mask
)
1433 if (err_mask
& AC_ERR_HOST_BUS
)
1434 return "host bus error";
1435 if (err_mask
& AC_ERR_ATA_BUS
)
1436 return "ATA bus error";
1437 if (err_mask
& AC_ERR_TIMEOUT
)
1439 if (err_mask
& AC_ERR_HSM
)
1440 return "HSM violation";
1441 if (err_mask
& AC_ERR_SYSTEM
)
1442 return "internal error";
1443 if (err_mask
& AC_ERR_MEDIA
)
1444 return "media error";
1445 if (err_mask
& AC_ERR_INVALID
)
1446 return "invalid argument";
1447 if (err_mask
& AC_ERR_DEV
)
1448 return "device error";
1449 return "unknown error";
1453 * ata_read_log_page - read a specific log page
1454 * @dev: target device
1455 * @page: page to read
1456 * @buf: buffer to store read page
1457 * @sectors: number of sectors to read
1459 * Read log page using READ_LOG_EXT command.
1462 * Kernel thread context (may sleep).
1465 * 0 on success, AC_ERR_* mask otherwise.
1467 static unsigned int ata_read_log_page(struct ata_device
*dev
,
1468 u8 page
, void *buf
, unsigned int sectors
)
1470 struct ata_taskfile tf
;
1471 unsigned int err_mask
;
1473 DPRINTK("read log page - page %d\n", page
);
1475 ata_tf_init(dev
, &tf
);
1476 tf
.command
= ATA_CMD_READ_LOG_EXT
;
1479 tf
.hob_nsect
= sectors
>> 8;
1480 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA48
| ATA_TFLAG_DEVICE
;
1481 tf
.protocol
= ATA_PROT_PIO
;
1483 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1484 buf
, sectors
* ATA_SECT_SIZE
, 0);
1486 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
1491 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1492 * @dev: Device to read log page 10h from
1493 * @tag: Resulting tag of the failed command
1494 * @tf: Resulting taskfile registers of the failed command
1496 * Read log page 10h to obtain NCQ error details and clear error
1500 * Kernel thread context (may sleep).
1503 * 0 on success, -errno otherwise.
1505 static int ata_eh_read_log_10h(struct ata_device
*dev
,
1506 int *tag
, struct ata_taskfile
*tf
)
1508 u8
*buf
= dev
->link
->ap
->sector_buf
;
1509 unsigned int err_mask
;
1513 err_mask
= ata_read_log_page(dev
, ATA_LOG_SATA_NCQ
, buf
, 1);
1518 for (i
= 0; i
< ATA_SECT_SIZE
; i
++)
1521 ata_dev_warn(dev
, "invalid checksum 0x%x on log page 10h\n",
1527 *tag
= buf
[0] & 0x1f;
1529 tf
->command
= buf
[2];
1530 tf
->feature
= buf
[3];
1534 tf
->device
= buf
[7];
1535 tf
->hob_lbal
= buf
[8];
1536 tf
->hob_lbam
= buf
[9];
1537 tf
->hob_lbah
= buf
[10];
1538 tf
->nsect
= buf
[12];
1539 tf
->hob_nsect
= buf
[13];
1545 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1546 * @dev: target ATAPI device
1547 * @r_sense_key: out parameter for sense_key
1549 * Perform ATAPI TEST_UNIT_READY.
1552 * EH context (may sleep).
1555 * 0 on success, AC_ERR_* mask on failure.
1557 static unsigned int atapi_eh_tur(struct ata_device
*dev
, u8
*r_sense_key
)
1559 u8 cdb
[ATAPI_CDB_LEN
] = { TEST_UNIT_READY
, 0, 0, 0, 0, 0 };
1560 struct ata_taskfile tf
;
1561 unsigned int err_mask
;
1563 ata_tf_init(dev
, &tf
);
1565 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1566 tf
.command
= ATA_CMD_PACKET
;
1567 tf
.protocol
= ATAPI_PROT_NODATA
;
1569 err_mask
= ata_exec_internal(dev
, &tf
, cdb
, DMA_NONE
, NULL
, 0, 0);
1570 if (err_mask
== AC_ERR_DEV
)
1571 *r_sense_key
= tf
.feature
>> 4;
1576 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1577 * @dev: device to perform REQUEST_SENSE to
1578 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1579 * @dfl_sense_key: default sense key to use
1581 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1582 * SENSE. This function is EH helper.
1585 * Kernel thread context (may sleep).
1588 * 0 on success, AC_ERR_* mask on failure
1590 static unsigned int atapi_eh_request_sense(struct ata_device
*dev
,
1591 u8
*sense_buf
, u8 dfl_sense_key
)
1593 u8 cdb
[ATAPI_CDB_LEN
] =
1594 { REQUEST_SENSE
, 0, 0, 0, SCSI_SENSE_BUFFERSIZE
, 0 };
1595 struct ata_port
*ap
= dev
->link
->ap
;
1596 struct ata_taskfile tf
;
1598 DPRINTK("ATAPI request sense\n");
1600 /* FIXME: is this needed? */
1601 memset(sense_buf
, 0, SCSI_SENSE_BUFFERSIZE
);
1603 /* initialize sense_buf with the error register,
1604 * for the case where they are -not- overwritten
1606 sense_buf
[0] = 0x70;
1607 sense_buf
[2] = dfl_sense_key
;
1609 /* some devices time out if garbage left in tf */
1610 ata_tf_init(dev
, &tf
);
1612 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1613 tf
.command
= ATA_CMD_PACKET
;
1615 /* is it pointless to prefer PIO for "safety reasons"? */
1616 if (ap
->flags
& ATA_FLAG_PIO_DMA
) {
1617 tf
.protocol
= ATAPI_PROT_DMA
;
1618 tf
.feature
|= ATAPI_PKT_DMA
;
1620 tf
.protocol
= ATAPI_PROT_PIO
;
1621 tf
.lbam
= SCSI_SENSE_BUFFERSIZE
;
1625 return ata_exec_internal(dev
, &tf
, cdb
, DMA_FROM_DEVICE
,
1626 sense_buf
, SCSI_SENSE_BUFFERSIZE
, 0);
1630 * ata_eh_analyze_serror - analyze SError for a failed port
1631 * @link: ATA link to analyze SError for
1633 * Analyze SError if available and further determine cause of
1639 static void ata_eh_analyze_serror(struct ata_link
*link
)
1641 struct ata_eh_context
*ehc
= &link
->eh_context
;
1642 u32 serror
= ehc
->i
.serror
;
1643 unsigned int err_mask
= 0, action
= 0;
1646 if (serror
& (SERR_PERSISTENT
| SERR_DATA
)) {
1647 err_mask
|= AC_ERR_ATA_BUS
;
1648 action
|= ATA_EH_RESET
;
1650 if (serror
& SERR_PROTOCOL
) {
1651 err_mask
|= AC_ERR_HSM
;
1652 action
|= ATA_EH_RESET
;
1654 if (serror
& SERR_INTERNAL
) {
1655 err_mask
|= AC_ERR_SYSTEM
;
1656 action
|= ATA_EH_RESET
;
1659 /* Determine whether a hotplug event has occurred. Both
1660 * SError.N/X are considered hotplug events for enabled or
1661 * host links. For disabled PMP links, only N bit is
1662 * considered as X bit is left at 1 for link plugging.
1664 if (link
->lpm_policy
> ATA_LPM_MAX_POWER
)
1665 hotplug_mask
= 0; /* hotplug doesn't work w/ LPM */
1666 else if (!(link
->flags
& ATA_LFLAG_DISABLED
) || ata_is_host_link(link
))
1667 hotplug_mask
= SERR_PHYRDY_CHG
| SERR_DEV_XCHG
;
1669 hotplug_mask
= SERR_PHYRDY_CHG
;
1671 if (serror
& hotplug_mask
)
1672 ata_ehi_hotplugged(&ehc
->i
);
1674 ehc
->i
.err_mask
|= err_mask
;
1675 ehc
->i
.action
|= action
;
1679 * ata_eh_analyze_ncq_error - analyze NCQ error
1680 * @link: ATA link to analyze NCQ error for
1682 * Read log page 10h, determine the offending qc and acquire
1683 * error status TF. For NCQ device errors, all LLDDs have to do
1684 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1688 * Kernel thread context (may sleep).
1690 void ata_eh_analyze_ncq_error(struct ata_link
*link
)
1692 struct ata_port
*ap
= link
->ap
;
1693 struct ata_eh_context
*ehc
= &link
->eh_context
;
1694 struct ata_device
*dev
= link
->device
;
1695 struct ata_queued_cmd
*qc
;
1696 struct ata_taskfile tf
;
1699 /* if frozen, we can't do much */
1700 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1703 /* is it NCQ device error? */
1704 if (!link
->sactive
|| !(ehc
->i
.err_mask
& AC_ERR_DEV
))
1707 /* has LLDD analyzed already? */
1708 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1709 qc
= __ata_qc_from_tag(ap
, tag
);
1711 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1718 /* okay, this error is ours */
1719 memset(&tf
, 0, sizeof(tf
));
1720 rc
= ata_eh_read_log_10h(dev
, &tag
, &tf
);
1722 ata_link_err(link
, "failed to read log page 10h (errno=%d)\n",
1727 if (!(link
->sactive
& (1 << tag
))) {
1728 ata_link_err(link
, "log page 10h reported inactive tag %d\n",
1733 /* we've got the perpetrator, condemn it */
1734 qc
= __ata_qc_from_tag(ap
, tag
);
1735 memcpy(&qc
->result_tf
, &tf
, sizeof(tf
));
1736 qc
->result_tf
.flags
= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA
| ATA_TFLAG_LBA48
;
1737 qc
->err_mask
|= AC_ERR_DEV
| AC_ERR_NCQ
;
1738 ehc
->i
.err_mask
&= ~AC_ERR_DEV
;
1742 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1743 * @qc: qc to analyze
1744 * @tf: Taskfile registers to analyze
1746 * Analyze taskfile of @qc and further determine cause of
1747 * failure. This function also requests ATAPI sense data if
1751 * Kernel thread context (may sleep).
1754 * Determined recovery action
1756 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd
*qc
,
1757 const struct ata_taskfile
*tf
)
1759 unsigned int tmp
, action
= 0;
1760 u8 stat
= tf
->command
, err
= tf
->feature
;
1762 if ((stat
& (ATA_BUSY
| ATA_DRQ
| ATA_DRDY
)) != ATA_DRDY
) {
1763 qc
->err_mask
|= AC_ERR_HSM
;
1764 return ATA_EH_RESET
;
1767 if (stat
& (ATA_ERR
| ATA_DF
))
1768 qc
->err_mask
|= AC_ERR_DEV
;
1772 switch (qc
->dev
->class) {
1775 qc
->err_mask
|= AC_ERR_ATA_BUS
;
1777 qc
->err_mask
|= AC_ERR_MEDIA
;
1779 qc
->err_mask
|= AC_ERR_INVALID
;
1783 if (!(qc
->ap
->pflags
& ATA_PFLAG_FROZEN
)) {
1784 tmp
= atapi_eh_request_sense(qc
->dev
,
1785 qc
->scsicmd
->sense_buffer
,
1786 qc
->result_tf
.feature
>> 4);
1788 /* ATA_QCFLAG_SENSE_VALID is used to
1789 * tell atapi_qc_complete() that sense
1790 * data is already valid.
1792 * TODO: interpret sense data and set
1793 * appropriate err_mask.
1795 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1797 qc
->err_mask
|= tmp
;
1801 if (qc
->err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
| AC_ERR_ATA_BUS
))
1802 action
|= ATA_EH_RESET
;
1807 static int ata_eh_categorize_error(unsigned int eflags
, unsigned int err_mask
,
1812 if (!(eflags
& ATA_EFLAG_DUBIOUS_XFER
))
1816 base
= ATA_ECAT_DUBIOUS_NONE
;
1818 if (err_mask
& AC_ERR_ATA_BUS
)
1819 return base
+ ATA_ECAT_ATA_BUS
;
1821 if (err_mask
& AC_ERR_TIMEOUT
)
1822 return base
+ ATA_ECAT_TOUT_HSM
;
1824 if (eflags
& ATA_EFLAG_IS_IO
) {
1825 if (err_mask
& AC_ERR_HSM
)
1826 return base
+ ATA_ECAT_TOUT_HSM
;
1828 (AC_ERR_DEV
|AC_ERR_MEDIA
|AC_ERR_INVALID
)) == AC_ERR_DEV
)
1829 return base
+ ATA_ECAT_UNK_DEV
;
1835 struct speed_down_verdict_arg
{
1838 int nr_errors
[ATA_ECAT_NR
];
1841 static int speed_down_verdict_cb(struct ata_ering_entry
*ent
, void *void_arg
)
1843 struct speed_down_verdict_arg
*arg
= void_arg
;
1846 if ((ent
->eflags
& ATA_EFLAG_OLD_ER
) || (ent
->timestamp
< arg
->since
))
1849 cat
= ata_eh_categorize_error(ent
->eflags
, ent
->err_mask
,
1851 arg
->nr_errors
[cat
]++;
1857 * ata_eh_speed_down_verdict - Determine speed down verdict
1858 * @dev: Device of interest
1860 * This function examines error ring of @dev and determines
1861 * whether NCQ needs to be turned off, transfer speed should be
1862 * stepped down, or falling back to PIO is necessary.
1864 * ECAT_ATA_BUS : ATA_BUS error for any command
1866 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1869 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1871 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1872 * data transfer hasn't been verified.
1876 * NCQ_OFF : Turn off NCQ.
1878 * SPEED_DOWN : Speed down transfer speed but don't fall back
1881 * FALLBACK_TO_PIO : Fall back to PIO.
1883 * Even if multiple verdicts are returned, only one action is
1884 * taken per error. An action triggered by non-DUBIOUS errors
1885 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1886 * This is to expedite speed down decisions right after device is
1887 * initially configured.
1889 * The followings are speed down rules. #1 and #2 deal with
1892 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1893 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1895 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1896 * occurred during last 5 mins, NCQ_OFF.
1898 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1899 * occurred during last 5 mins, FALLBACK_TO_PIO
1901 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1902 * during last 10 mins, NCQ_OFF.
1904 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1905 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1908 * Inherited from caller.
1911 * OR of ATA_EH_SPDN_* flags.
1913 static unsigned int ata_eh_speed_down_verdict(struct ata_device
*dev
)
1915 const u64 j5mins
= 5LLU * 60 * HZ
, j10mins
= 10LLU * 60 * HZ
;
1916 u64 j64
= get_jiffies_64();
1917 struct speed_down_verdict_arg arg
;
1918 unsigned int verdict
= 0;
1920 /* scan past 5 mins of error history */
1921 memset(&arg
, 0, sizeof(arg
));
1922 arg
.since
= j64
- min(j64
, j5mins
);
1923 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1925 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_ATA_BUS
] +
1926 arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] > 1)
1927 verdict
|= ATA_EH_SPDN_SPEED_DOWN
|
1928 ATA_EH_SPDN_FALLBACK_TO_PIO
| ATA_EH_SPDN_KEEP_ERRORS
;
1930 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] +
1931 arg
.nr_errors
[ATA_ECAT_DUBIOUS_UNK_DEV
] > 1)
1932 verdict
|= ATA_EH_SPDN_NCQ_OFF
| ATA_EH_SPDN_KEEP_ERRORS
;
1934 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1935 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1936 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1937 verdict
|= ATA_EH_SPDN_FALLBACK_TO_PIO
;
1939 /* scan past 10 mins of error history */
1940 memset(&arg
, 0, sizeof(arg
));
1941 arg
.since
= j64
- min(j64
, j10mins
);
1942 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1944 if (arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1945 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 3)
1946 verdict
|= ATA_EH_SPDN_NCQ_OFF
;
1948 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1949 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] > 3 ||
1950 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1951 verdict
|= ATA_EH_SPDN_SPEED_DOWN
;
1957 * ata_eh_speed_down - record error and speed down if necessary
1958 * @dev: Failed device
1959 * @eflags: mask of ATA_EFLAG_* flags
1960 * @err_mask: err_mask of the error
1962 * Record error and examine error history to determine whether
1963 * adjusting transmission speed is necessary. It also sets
1964 * transmission limits appropriately if such adjustment is
1968 * Kernel thread context (may sleep).
1971 * Determined recovery action.
1973 static unsigned int ata_eh_speed_down(struct ata_device
*dev
,
1974 unsigned int eflags
, unsigned int err_mask
)
1976 struct ata_link
*link
= ata_dev_phys_link(dev
);
1978 unsigned int verdict
;
1979 unsigned int action
= 0;
1981 /* don't bother if Cat-0 error */
1982 if (ata_eh_categorize_error(eflags
, err_mask
, &xfer_ok
) == 0)
1985 /* record error and determine whether speed down is necessary */
1986 ata_ering_record(&dev
->ering
, eflags
, err_mask
);
1987 verdict
= ata_eh_speed_down_verdict(dev
);
1990 if ((verdict
& ATA_EH_SPDN_NCQ_OFF
) &&
1991 (dev
->flags
& (ATA_DFLAG_PIO
| ATA_DFLAG_NCQ
|
1992 ATA_DFLAG_NCQ_OFF
)) == ATA_DFLAG_NCQ
) {
1993 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
1994 ata_dev_warn(dev
, "NCQ disabled due to excessive errors\n");
1999 if (verdict
& ATA_EH_SPDN_SPEED_DOWN
) {
2000 /* speed down SATA link speed if possible */
2001 if (sata_down_spd_limit(link
, 0) == 0) {
2002 action
|= ATA_EH_RESET
;
2006 /* lower transfer mode */
2007 if (dev
->spdn_cnt
< 2) {
2008 static const int dma_dnxfer_sel
[] =
2009 { ATA_DNXFER_DMA
, ATA_DNXFER_40C
};
2010 static const int pio_dnxfer_sel
[] =
2011 { ATA_DNXFER_PIO
, ATA_DNXFER_FORCE_PIO0
};
2014 if (dev
->xfer_shift
!= ATA_SHIFT_PIO
)
2015 sel
= dma_dnxfer_sel
[dev
->spdn_cnt
];
2017 sel
= pio_dnxfer_sel
[dev
->spdn_cnt
];
2021 if (ata_down_xfermask_limit(dev
, sel
) == 0) {
2022 action
|= ATA_EH_RESET
;
2028 /* Fall back to PIO? Slowing down to PIO is meaningless for
2029 * SATA ATA devices. Consider it only for PATA and SATAPI.
2031 if ((verdict
& ATA_EH_SPDN_FALLBACK_TO_PIO
) && (dev
->spdn_cnt
>= 2) &&
2032 (link
->ap
->cbl
!= ATA_CBL_SATA
|| dev
->class == ATA_DEV_ATAPI
) &&
2033 (dev
->xfer_shift
!= ATA_SHIFT_PIO
)) {
2034 if (ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO
) == 0) {
2036 action
|= ATA_EH_RESET
;
2043 /* device has been slowed down, blow error history */
2044 if (!(verdict
& ATA_EH_SPDN_KEEP_ERRORS
))
2045 ata_ering_clear(&dev
->ering
);
2050 * ata_eh_worth_retry - analyze error and decide whether to retry
2051 * @qc: qc to possibly retry
2053 * Look at the cause of the error and decide if a retry
2054 * might be useful or not. We don't want to retry media errors
2055 * because the drive itself has probably already taken 10-30 seconds
2056 * doing its own internal retries before reporting the failure.
2058 static inline int ata_eh_worth_retry(struct ata_queued_cmd
*qc
)
2060 if (qc
->flags
& AC_ERR_MEDIA
)
2061 return 0; /* don't retry media errors */
2062 if (qc
->flags
& ATA_QCFLAG_IO
)
2063 return 1; /* otherwise retry anything from fs stack */
2064 if (qc
->err_mask
& AC_ERR_INVALID
)
2065 return 0; /* don't retry these */
2066 return qc
->err_mask
!= AC_ERR_DEV
; /* retry if not dev error */
2070 * ata_eh_link_autopsy - analyze error and determine recovery action
2071 * @link: host link to perform autopsy on
2073 * Analyze why @link failed and determine which recovery actions
2074 * are needed. This function also sets more detailed AC_ERR_*
2075 * values and fills sense data for ATAPI CHECK SENSE.
2078 * Kernel thread context (may sleep).
2080 static void ata_eh_link_autopsy(struct ata_link
*link
)
2082 struct ata_port
*ap
= link
->ap
;
2083 struct ata_eh_context
*ehc
= &link
->eh_context
;
2084 struct ata_device
*dev
;
2085 unsigned int all_err_mask
= 0, eflags
= 0;
2092 if (ehc
->i
.flags
& ATA_EHI_NO_AUTOPSY
)
2095 /* obtain and analyze SError */
2096 rc
= sata_scr_read(link
, SCR_ERROR
, &serror
);
2098 ehc
->i
.serror
|= serror
;
2099 ata_eh_analyze_serror(link
);
2100 } else if (rc
!= -EOPNOTSUPP
) {
2101 /* SError read failed, force reset and probing */
2102 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
2103 ehc
->i
.action
|= ATA_EH_RESET
;
2104 ehc
->i
.err_mask
|= AC_ERR_OTHER
;
2107 /* analyze NCQ failure */
2108 ata_eh_analyze_ncq_error(link
);
2110 /* any real error trumps AC_ERR_OTHER */
2111 if (ehc
->i
.err_mask
& ~AC_ERR_OTHER
)
2112 ehc
->i
.err_mask
&= ~AC_ERR_OTHER
;
2114 all_err_mask
|= ehc
->i
.err_mask
;
2116 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2117 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2119 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2120 ata_dev_phys_link(qc
->dev
) != link
)
2123 /* inherit upper level err_mask */
2124 qc
->err_mask
|= ehc
->i
.err_mask
;
2127 ehc
->i
.action
|= ata_eh_analyze_tf(qc
, &qc
->result_tf
);
2129 /* DEV errors are probably spurious in case of ATA_BUS error */
2130 if (qc
->err_mask
& AC_ERR_ATA_BUS
)
2131 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_MEDIA
|
2134 /* any real error trumps unknown error */
2135 if (qc
->err_mask
& ~AC_ERR_OTHER
)
2136 qc
->err_mask
&= ~AC_ERR_OTHER
;
2138 /* SENSE_VALID trumps dev/unknown error and revalidation */
2139 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
2140 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_OTHER
);
2142 /* determine whether the command is worth retrying */
2143 if (ata_eh_worth_retry(qc
))
2144 qc
->flags
|= ATA_QCFLAG_RETRY
;
2146 /* accumulate error info */
2147 ehc
->i
.dev
= qc
->dev
;
2148 all_err_mask
|= qc
->err_mask
;
2149 if (qc
->flags
& ATA_QCFLAG_IO
)
2150 eflags
|= ATA_EFLAG_IS_IO
;
2153 /* enforce default EH actions */
2154 if (ap
->pflags
& ATA_PFLAG_FROZEN
||
2155 all_err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
))
2156 ehc
->i
.action
|= ATA_EH_RESET
;
2157 else if (((eflags
& ATA_EFLAG_IS_IO
) && all_err_mask
) ||
2158 (!(eflags
& ATA_EFLAG_IS_IO
) && (all_err_mask
& ~AC_ERR_DEV
)))
2159 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2161 /* If we have offending qcs and the associated failed device,
2162 * perform per-dev EH action only on the offending device.
2165 ehc
->i
.dev_action
[ehc
->i
.dev
->devno
] |=
2166 ehc
->i
.action
& ATA_EH_PERDEV_MASK
;
2167 ehc
->i
.action
&= ~ATA_EH_PERDEV_MASK
;
2170 /* propagate timeout to host link */
2171 if ((all_err_mask
& AC_ERR_TIMEOUT
) && !ata_is_host_link(link
))
2172 ap
->link
.eh_context
.i
.err_mask
|= AC_ERR_TIMEOUT
;
2174 /* record error and consider speeding down */
2176 if (!dev
&& ((ata_link_max_devices(link
) == 1 &&
2177 ata_dev_enabled(link
->device
))))
2181 if (dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)
2182 eflags
|= ATA_EFLAG_DUBIOUS_XFER
;
2183 ehc
->i
.action
|= ata_eh_speed_down(dev
, eflags
, all_err_mask
);
2190 * ata_eh_autopsy - analyze error and determine recovery action
2191 * @ap: host port to perform autopsy on
2193 * Analyze all links of @ap and determine why they failed and
2194 * which recovery actions are needed.
2197 * Kernel thread context (may sleep).
2199 void ata_eh_autopsy(struct ata_port
*ap
)
2201 struct ata_link
*link
;
2203 ata_for_each_link(link
, ap
, EDGE
)
2204 ata_eh_link_autopsy(link
);
2206 /* Handle the frigging slave link. Autopsy is done similarly
2207 * but actions and flags are transferred over to the master
2208 * link and handled from there.
2210 if (ap
->slave_link
) {
2211 struct ata_eh_context
*mehc
= &ap
->link
.eh_context
;
2212 struct ata_eh_context
*sehc
= &ap
->slave_link
->eh_context
;
2214 /* transfer control flags from master to slave */
2215 sehc
->i
.flags
|= mehc
->i
.flags
& ATA_EHI_TO_SLAVE_MASK
;
2217 /* perform autopsy on the slave link */
2218 ata_eh_link_autopsy(ap
->slave_link
);
2220 /* transfer actions from slave to master and clear slave */
2221 ata_eh_about_to_do(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2222 mehc
->i
.action
|= sehc
->i
.action
;
2223 mehc
->i
.dev_action
[1] |= sehc
->i
.dev_action
[1];
2224 mehc
->i
.flags
|= sehc
->i
.flags
;
2225 ata_eh_done(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2228 /* Autopsy of fanout ports can affect host link autopsy.
2229 * Perform host link autopsy last.
2231 if (sata_pmp_attached(ap
))
2232 ata_eh_link_autopsy(&ap
->link
);
2236 * ata_get_cmd_descript - get description for ATA command
2237 * @command: ATA command code to get description for
2239 * Return a textual description of the given command, or NULL if the
2240 * command is not known.
2245 const char *ata_get_cmd_descript(u8 command
)
2247 #ifdef CONFIG_ATA_VERBOSE_ERROR
2253 { ATA_CMD_DEV_RESET
, "DEVICE RESET" },
2254 { ATA_CMD_CHK_POWER
, "CHECK POWER MODE" },
2255 { ATA_CMD_STANDBY
, "STANDBY" },
2256 { ATA_CMD_IDLE
, "IDLE" },
2257 { ATA_CMD_EDD
, "EXECUTE DEVICE DIAGNOSTIC" },
2258 { ATA_CMD_DOWNLOAD_MICRO
, "DOWNLOAD MICROCODE" },
2259 { ATA_CMD_NOP
, "NOP" },
2260 { ATA_CMD_FLUSH
, "FLUSH CACHE" },
2261 { ATA_CMD_FLUSH_EXT
, "FLUSH CACHE EXT" },
2262 { ATA_CMD_ID_ATA
, "IDENTIFY DEVICE" },
2263 { ATA_CMD_ID_ATAPI
, "IDENTIFY PACKET DEVICE" },
2264 { ATA_CMD_SERVICE
, "SERVICE" },
2265 { ATA_CMD_READ
, "READ DMA" },
2266 { ATA_CMD_READ_EXT
, "READ DMA EXT" },
2267 { ATA_CMD_READ_QUEUED
, "READ DMA QUEUED" },
2268 { ATA_CMD_READ_STREAM_EXT
, "READ STREAM EXT" },
2269 { ATA_CMD_READ_STREAM_DMA_EXT
, "READ STREAM DMA EXT" },
2270 { ATA_CMD_WRITE
, "WRITE DMA" },
2271 { ATA_CMD_WRITE_EXT
, "WRITE DMA EXT" },
2272 { ATA_CMD_WRITE_QUEUED
, "WRITE DMA QUEUED EXT" },
2273 { ATA_CMD_WRITE_STREAM_EXT
, "WRITE STREAM EXT" },
2274 { ATA_CMD_WRITE_STREAM_DMA_EXT
, "WRITE STREAM DMA EXT" },
2275 { ATA_CMD_WRITE_FUA_EXT
, "WRITE DMA FUA EXT" },
2276 { ATA_CMD_WRITE_QUEUED_FUA_EXT
, "WRITE DMA QUEUED FUA EXT" },
2277 { ATA_CMD_FPDMA_READ
, "READ FPDMA QUEUED" },
2278 { ATA_CMD_FPDMA_WRITE
, "WRITE FPDMA QUEUED" },
2279 { ATA_CMD_PIO_READ
, "READ SECTOR(S)" },
2280 { ATA_CMD_PIO_READ_EXT
, "READ SECTOR(S) EXT" },
2281 { ATA_CMD_PIO_WRITE
, "WRITE SECTOR(S)" },
2282 { ATA_CMD_PIO_WRITE_EXT
, "WRITE SECTOR(S) EXT" },
2283 { ATA_CMD_READ_MULTI
, "READ MULTIPLE" },
2284 { ATA_CMD_READ_MULTI_EXT
, "READ MULTIPLE EXT" },
2285 { ATA_CMD_WRITE_MULTI
, "WRITE MULTIPLE" },
2286 { ATA_CMD_WRITE_MULTI_EXT
, "WRITE MULTIPLE EXT" },
2287 { ATA_CMD_WRITE_MULTI_FUA_EXT
, "WRITE MULTIPLE FUA EXT" },
2288 { ATA_CMD_SET_FEATURES
, "SET FEATURES" },
2289 { ATA_CMD_SET_MULTI
, "SET MULTIPLE MODE" },
2290 { ATA_CMD_VERIFY
, "READ VERIFY SECTOR(S)" },
2291 { ATA_CMD_VERIFY_EXT
, "READ VERIFY SECTOR(S) EXT" },
2292 { ATA_CMD_WRITE_UNCORR_EXT
, "WRITE UNCORRECTABLE EXT" },
2293 { ATA_CMD_STANDBYNOW1
, "STANDBY IMMEDIATE" },
2294 { ATA_CMD_IDLEIMMEDIATE
, "IDLE IMMEDIATE" },
2295 { ATA_CMD_SLEEP
, "SLEEP" },
2296 { ATA_CMD_INIT_DEV_PARAMS
, "INITIALIZE DEVICE PARAMETERS" },
2297 { ATA_CMD_READ_NATIVE_MAX
, "READ NATIVE MAX ADDRESS" },
2298 { ATA_CMD_READ_NATIVE_MAX_EXT
, "READ NATIVE MAX ADDRESS EXT" },
2299 { ATA_CMD_SET_MAX
, "SET MAX ADDRESS" },
2300 { ATA_CMD_SET_MAX_EXT
, "SET MAX ADDRESS EXT" },
2301 { ATA_CMD_READ_LOG_EXT
, "READ LOG EXT" },
2302 { ATA_CMD_WRITE_LOG_EXT
, "WRITE LOG EXT" },
2303 { ATA_CMD_READ_LOG_DMA_EXT
, "READ LOG DMA EXT" },
2304 { ATA_CMD_WRITE_LOG_DMA_EXT
, "WRITE LOG DMA EXT" },
2305 { ATA_CMD_TRUSTED_RCV
, "TRUSTED RECEIVE" },
2306 { ATA_CMD_TRUSTED_RCV_DMA
, "TRUSTED RECEIVE DMA" },
2307 { ATA_CMD_TRUSTED_SND
, "TRUSTED SEND" },
2308 { ATA_CMD_TRUSTED_SND_DMA
, "TRUSTED SEND DMA" },
2309 { ATA_CMD_PMP_READ
, "READ BUFFER" },
2310 { ATA_CMD_PMP_WRITE
, "WRITE BUFFER" },
2311 { ATA_CMD_CONF_OVERLAY
, "DEVICE CONFIGURATION OVERLAY" },
2312 { ATA_CMD_SEC_SET_PASS
, "SECURITY SET PASSWORD" },
2313 { ATA_CMD_SEC_UNLOCK
, "SECURITY UNLOCK" },
2314 { ATA_CMD_SEC_ERASE_PREP
, "SECURITY ERASE PREPARE" },
2315 { ATA_CMD_SEC_ERASE_UNIT
, "SECURITY ERASE UNIT" },
2316 { ATA_CMD_SEC_FREEZE_LOCK
, "SECURITY FREEZE LOCK" },
2317 { ATA_CMD_SEC_DISABLE_PASS
, "SECURITY DISABLE PASSWORD" },
2318 { ATA_CMD_CONFIG_STREAM
, "CONFIGURE STREAM" },
2319 { ATA_CMD_SMART
, "SMART" },
2320 { ATA_CMD_MEDIA_LOCK
, "DOOR LOCK" },
2321 { ATA_CMD_MEDIA_UNLOCK
, "DOOR UNLOCK" },
2322 { ATA_CMD_DSM
, "DATA SET MANAGEMENT" },
2323 { ATA_CMD_CHK_MED_CRD_TYP
, "CHECK MEDIA CARD TYPE" },
2324 { ATA_CMD_CFA_REQ_EXT_ERR
, "CFA REQUEST EXTENDED ERROR" },
2325 { ATA_CMD_CFA_WRITE_NE
, "CFA WRITE SECTORS WITHOUT ERASE" },
2326 { ATA_CMD_CFA_TRANS_SECT
, "CFA TRANSLATE SECTOR" },
2327 { ATA_CMD_CFA_ERASE
, "CFA ERASE SECTORS" },
2328 { ATA_CMD_CFA_WRITE_MULT_NE
, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2329 { ATA_CMD_READ_LONG
, "READ LONG (with retries)" },
2330 { ATA_CMD_READ_LONG_ONCE
, "READ LONG (without retries)" },
2331 { ATA_CMD_WRITE_LONG
, "WRITE LONG (with retries)" },
2332 { ATA_CMD_WRITE_LONG_ONCE
, "WRITE LONG (without retries)" },
2333 { ATA_CMD_RESTORE
, "RECALIBRATE" },
2334 { 0, NULL
} /* terminate list */
2338 for (i
= 0; cmd_descr
[i
].text
; i
++)
2339 if (cmd_descr
[i
].command
== command
)
2340 return cmd_descr
[i
].text
;
2347 * ata_eh_link_report - report error handling to user
2348 * @link: ATA link EH is going on
2350 * Report EH to user.
2355 static void ata_eh_link_report(struct ata_link
*link
)
2357 struct ata_port
*ap
= link
->ap
;
2358 struct ata_eh_context
*ehc
= &link
->eh_context
;
2359 const char *frozen
, *desc
;
2361 int tag
, nr_failed
= 0;
2363 if (ehc
->i
.flags
& ATA_EHI_QUIET
)
2367 if (ehc
->i
.desc
[0] != '\0')
2370 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2371 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2373 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2374 ata_dev_phys_link(qc
->dev
) != link
||
2375 ((qc
->flags
& ATA_QCFLAG_QUIET
) &&
2376 qc
->err_mask
== AC_ERR_DEV
))
2378 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
&& !qc
->err_mask
)
2384 if (!nr_failed
&& !ehc
->i
.err_mask
)
2388 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2391 memset(tries_buf
, 0, sizeof(tries_buf
));
2392 if (ap
->eh_tries
< ATA_EH_MAX_TRIES
)
2393 snprintf(tries_buf
, sizeof(tries_buf
) - 1, " t%d",
2397 ata_dev_err(ehc
->i
.dev
, "exception Emask 0x%x "
2398 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2399 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2400 ehc
->i
.action
, frozen
, tries_buf
);
2402 ata_dev_err(ehc
->i
.dev
, "%s\n", desc
);
2404 ata_link_err(link
, "exception Emask 0x%x "
2405 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2406 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2407 ehc
->i
.action
, frozen
, tries_buf
);
2409 ata_link_err(link
, "%s\n", desc
);
2412 #ifdef CONFIG_ATA_VERBOSE_ERROR
2415 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2416 ehc
->i
.serror
& SERR_DATA_RECOVERED
? "RecovData " : "",
2417 ehc
->i
.serror
& SERR_COMM_RECOVERED
? "RecovComm " : "",
2418 ehc
->i
.serror
& SERR_DATA
? "UnrecovData " : "",
2419 ehc
->i
.serror
& SERR_PERSISTENT
? "Persist " : "",
2420 ehc
->i
.serror
& SERR_PROTOCOL
? "Proto " : "",
2421 ehc
->i
.serror
& SERR_INTERNAL
? "HostInt " : "",
2422 ehc
->i
.serror
& SERR_PHYRDY_CHG
? "PHYRdyChg " : "",
2423 ehc
->i
.serror
& SERR_PHY_INT_ERR
? "PHYInt " : "",
2424 ehc
->i
.serror
& SERR_COMM_WAKE
? "CommWake " : "",
2425 ehc
->i
.serror
& SERR_10B_8B_ERR
? "10B8B " : "",
2426 ehc
->i
.serror
& SERR_DISPARITY
? "Dispar " : "",
2427 ehc
->i
.serror
& SERR_CRC
? "BadCRC " : "",
2428 ehc
->i
.serror
& SERR_HANDSHAKE
? "Handshk " : "",
2429 ehc
->i
.serror
& SERR_LINK_SEQ_ERR
? "LinkSeq " : "",
2430 ehc
->i
.serror
& SERR_TRANS_ST_ERROR
? "TrStaTrns " : "",
2431 ehc
->i
.serror
& SERR_UNRECOG_FIS
? "UnrecFIS " : "",
2432 ehc
->i
.serror
& SERR_DEV_XCHG
? "DevExch " : "");
2435 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2436 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2437 struct ata_taskfile
*cmd
= &qc
->tf
, *res
= &qc
->result_tf
;
2438 const u8
*cdb
= qc
->cdb
;
2439 char data_buf
[20] = "";
2440 char cdb_buf
[70] = "";
2442 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2443 ata_dev_phys_link(qc
->dev
) != link
|| !qc
->err_mask
)
2446 if (qc
->dma_dir
!= DMA_NONE
) {
2447 static const char *dma_str
[] = {
2448 [DMA_BIDIRECTIONAL
] = "bidi",
2449 [DMA_TO_DEVICE
] = "out",
2450 [DMA_FROM_DEVICE
] = "in",
2452 static const char *prot_str
[] = {
2453 [ATA_PROT_PIO
] = "pio",
2454 [ATA_PROT_DMA
] = "dma",
2455 [ATA_PROT_NCQ
] = "ncq",
2456 [ATAPI_PROT_PIO
] = "pio",
2457 [ATAPI_PROT_DMA
] = "dma",
2460 snprintf(data_buf
, sizeof(data_buf
), " %s %u %s",
2461 prot_str
[qc
->tf
.protocol
], qc
->nbytes
,
2462 dma_str
[qc
->dma_dir
]);
2465 if (ata_is_atapi(qc
->tf
.protocol
)) {
2467 scsi_print_command(qc
->scsicmd
);
2469 snprintf(cdb_buf
, sizeof(cdb_buf
),
2470 "cdb %02x %02x %02x %02x %02x %02x %02x %02x "
2471 "%02x %02x %02x %02x %02x %02x %02x %02x\n ",
2472 cdb
[0], cdb
[1], cdb
[2], cdb
[3],
2473 cdb
[4], cdb
[5], cdb
[6], cdb
[7],
2474 cdb
[8], cdb
[9], cdb
[10], cdb
[11],
2475 cdb
[12], cdb
[13], cdb
[14], cdb
[15]);
2477 const char *descr
= ata_get_cmd_descript(cmd
->command
);
2479 ata_dev_err(qc
->dev
, "failed command: %s\n",
2483 ata_dev_err(qc
->dev
,
2484 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2486 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2487 "Emask 0x%x (%s)%s\n",
2488 cmd
->command
, cmd
->feature
, cmd
->nsect
,
2489 cmd
->lbal
, cmd
->lbam
, cmd
->lbah
,
2490 cmd
->hob_feature
, cmd
->hob_nsect
,
2491 cmd
->hob_lbal
, cmd
->hob_lbam
, cmd
->hob_lbah
,
2492 cmd
->device
, qc
->tag
, data_buf
, cdb_buf
,
2493 res
->command
, res
->feature
, res
->nsect
,
2494 res
->lbal
, res
->lbam
, res
->lbah
,
2495 res
->hob_feature
, res
->hob_nsect
,
2496 res
->hob_lbal
, res
->hob_lbam
, res
->hob_lbah
,
2497 res
->device
, qc
->err_mask
, ata_err_string(qc
->err_mask
),
2498 qc
->err_mask
& AC_ERR_NCQ
? " <F>" : "");
2500 #ifdef CONFIG_ATA_VERBOSE_ERROR
2501 if (res
->command
& (ATA_BUSY
| ATA_DRDY
| ATA_DF
| ATA_DRQ
|
2503 if (res
->command
& ATA_BUSY
)
2504 ata_dev_err(qc
->dev
, "status: { Busy }\n");
2506 ata_dev_err(qc
->dev
, "status: { %s%s%s%s}\n",
2507 res
->command
& ATA_DRDY
? "DRDY " : "",
2508 res
->command
& ATA_DF
? "DF " : "",
2509 res
->command
& ATA_DRQ
? "DRQ " : "",
2510 res
->command
& ATA_ERR
? "ERR " : "");
2513 if (cmd
->command
!= ATA_CMD_PACKET
&&
2514 (res
->feature
& (ATA_ICRC
| ATA_UNC
| ATA_IDNF
|
2516 ata_dev_err(qc
->dev
, "error: { %s%s%s%s}\n",
2517 res
->feature
& ATA_ICRC
? "ICRC " : "",
2518 res
->feature
& ATA_UNC
? "UNC " : "",
2519 res
->feature
& ATA_IDNF
? "IDNF " : "",
2520 res
->feature
& ATA_ABORTED
? "ABRT " : "");
2526 * ata_eh_report - report error handling to user
2527 * @ap: ATA port to report EH about
2529 * Report EH to user.
2534 void ata_eh_report(struct ata_port
*ap
)
2536 struct ata_link
*link
;
2538 ata_for_each_link(link
, ap
, HOST_FIRST
)
2539 ata_eh_link_report(link
);
2542 static int ata_do_reset(struct ata_link
*link
, ata_reset_fn_t reset
,
2543 unsigned int *classes
, unsigned long deadline
,
2546 struct ata_device
*dev
;
2549 ata_for_each_dev(dev
, link
, ALL
)
2550 classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
2552 return reset(link
, classes
, deadline
);
2555 static int ata_eh_followup_srst_needed(struct ata_link
*link
, int rc
)
2557 if ((link
->flags
& ATA_LFLAG_NO_SRST
) || ata_link_offline(link
))
2561 if (sata_pmp_supported(link
->ap
) && ata_is_host_link(link
))
2566 int ata_eh_reset(struct ata_link
*link
, int classify
,
2567 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
2568 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
2570 struct ata_port
*ap
= link
->ap
;
2571 struct ata_link
*slave
= ap
->slave_link
;
2572 struct ata_eh_context
*ehc
= &link
->eh_context
;
2573 struct ata_eh_context
*sehc
= slave
? &slave
->eh_context
: NULL
;
2574 unsigned int *classes
= ehc
->classes
;
2575 unsigned int lflags
= link
->flags
;
2576 int verbose
= !(ehc
->i
.flags
& ATA_EHI_QUIET
);
2577 int max_tries
= 0, try = 0;
2578 struct ata_link
*failed_link
;
2579 struct ata_device
*dev
;
2580 unsigned long deadline
, now
;
2581 ata_reset_fn_t reset
;
2582 unsigned long flags
;
2589 while (ata_eh_reset_timeouts
[max_tries
] != ULONG_MAX
)
2591 if (link
->flags
& ATA_LFLAG_NO_HRST
)
2593 if (link
->flags
& ATA_LFLAG_NO_SRST
)
2596 /* make sure each reset attempt is at least COOL_DOWN apart */
2597 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
2599 WARN_ON(time_after(ehc
->last_reset
, now
));
2600 deadline
= ata_deadline(ehc
->last_reset
,
2601 ATA_EH_RESET_COOL_DOWN
);
2602 if (time_before(now
, deadline
))
2603 schedule_timeout_uninterruptible(deadline
- now
);
2606 spin_lock_irqsave(ap
->lock
, flags
);
2607 ap
->pflags
|= ATA_PFLAG_RESETTING
;
2608 spin_unlock_irqrestore(ap
->lock
, flags
);
2610 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2612 ata_for_each_dev(dev
, link
, ALL
) {
2613 /* If we issue an SRST then an ATA drive (not ATAPI)
2614 * may change configuration and be in PIO0 timing. If
2615 * we do a hard reset (or are coming from power on)
2616 * this is true for ATA or ATAPI. Until we've set a
2617 * suitable controller mode we should not touch the
2618 * bus as we may be talking too fast.
2620 dev
->pio_mode
= XFER_PIO_0
;
2622 /* If the controller has a pio mode setup function
2623 * then use it to set the chipset to rights. Don't
2624 * touch the DMA setup as that will be dealt with when
2625 * configuring devices.
2627 if (ap
->ops
->set_piomode
)
2628 ap
->ops
->set_piomode(ap
, dev
);
2631 /* prefer hardreset */
2633 ehc
->i
.action
&= ~ATA_EH_RESET
;
2636 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2637 } else if (softreset
) {
2639 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2643 unsigned long deadline
= ata_deadline(jiffies
,
2644 ATA_EH_PRERESET_TIMEOUT
);
2647 sehc
->i
.action
&= ~ATA_EH_RESET
;
2648 sehc
->i
.action
|= ehc
->i
.action
;
2651 rc
= prereset(link
, deadline
);
2653 /* If present, do prereset on slave link too. Reset
2654 * is skipped iff both master and slave links report
2655 * -ENOENT or clear ATA_EH_RESET.
2657 if (slave
&& (rc
== 0 || rc
== -ENOENT
)) {
2660 tmp
= prereset(slave
, deadline
);
2664 ehc
->i
.action
|= sehc
->i
.action
;
2668 if (rc
== -ENOENT
) {
2669 ata_link_dbg(link
, "port disabled--ignoring\n");
2670 ehc
->i
.action
&= ~ATA_EH_RESET
;
2672 ata_for_each_dev(dev
, link
, ALL
)
2673 classes
[dev
->devno
] = ATA_DEV_NONE
;
2678 "prereset failed (errno=%d)\n",
2683 /* prereset() might have cleared ATA_EH_RESET. If so,
2684 * bang classes, thaw and return.
2686 if (reset
&& !(ehc
->i
.action
& ATA_EH_RESET
)) {
2687 ata_for_each_dev(dev
, link
, ALL
)
2688 classes
[dev
->devno
] = ATA_DEV_NONE
;
2689 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) &&
2690 ata_is_host_link(link
))
2691 ata_eh_thaw_port(ap
);
2701 if (ata_is_host_link(link
))
2702 ata_eh_freeze_port(ap
);
2704 deadline
= ata_deadline(jiffies
, ata_eh_reset_timeouts
[try++]);
2708 ata_link_info(link
, "%s resetting link\n",
2709 reset
== softreset
? "soft" : "hard");
2711 /* mark that this EH session started with reset */
2712 ehc
->last_reset
= jiffies
;
2713 if (reset
== hardreset
)
2714 ehc
->i
.flags
|= ATA_EHI_DID_HARDRESET
;
2716 ehc
->i
.flags
|= ATA_EHI_DID_SOFTRESET
;
2718 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2719 if (rc
&& rc
!= -EAGAIN
) {
2724 /* hardreset slave link if existent */
2725 if (slave
&& reset
== hardreset
) {
2729 ata_link_info(slave
, "hard resetting link\n");
2731 ata_eh_about_to_do(slave
, NULL
, ATA_EH_RESET
);
2732 tmp
= ata_do_reset(slave
, reset
, classes
, deadline
,
2740 failed_link
= slave
;
2746 /* perform follow-up SRST if necessary */
2747 if (reset
== hardreset
&&
2748 ata_eh_followup_srst_needed(link
, rc
)) {
2753 "follow-up softreset required but no softreset available\n");
2759 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2760 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2769 "no reset method available, skipping reset\n");
2770 if (!(lflags
& ATA_LFLAG_ASSUME_CLASS
))
2771 lflags
|= ATA_LFLAG_ASSUME_ATA
;
2775 * Post-reset processing
2777 ata_for_each_dev(dev
, link
, ALL
) {
2778 /* After the reset, the device state is PIO 0 and the
2779 * controller state is undefined. Reset also wakes up
2780 * drives from sleeping mode.
2782 dev
->pio_mode
= XFER_PIO_0
;
2783 dev
->flags
&= ~ATA_DFLAG_SLEEPING
;
2785 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
2788 /* apply class override */
2789 if (lflags
& ATA_LFLAG_ASSUME_ATA
)
2790 classes
[dev
->devno
] = ATA_DEV_ATA
;
2791 else if (lflags
& ATA_LFLAG_ASSUME_SEMB
)
2792 classes
[dev
->devno
] = ATA_DEV_SEMB_UNSUP
;
2795 /* record current link speed */
2796 if (sata_scr_read(link
, SCR_STATUS
, &sstatus
) == 0)
2797 link
->sata_spd
= (sstatus
>> 4) & 0xf;
2798 if (slave
&& sata_scr_read(slave
, SCR_STATUS
, &sstatus
) == 0)
2799 slave
->sata_spd
= (sstatus
>> 4) & 0xf;
2802 if (ata_is_host_link(link
))
2803 ata_eh_thaw_port(ap
);
2805 /* postreset() should clear hardware SError. Although SError
2806 * is cleared during link resume, clearing SError here is
2807 * necessary as some PHYs raise hotplug events after SRST.
2808 * This introduces race condition where hotplug occurs between
2809 * reset and here. This race is mediated by cross checking
2810 * link onlineness and classification result later.
2813 postreset(link
, classes
);
2815 postreset(slave
, classes
);
2819 * Some controllers can't be frozen very well and may set spurious
2820 * error conditions during reset. Clear accumulated error
2821 * information and re-thaw the port if frozen. As reset is the
2822 * final recovery action and we cross check link onlineness against
2823 * device classification later, no hotplug event is lost by this.
2825 spin_lock_irqsave(link
->ap
->lock
, flags
);
2826 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
2828 memset(&slave
->eh_info
, 0, sizeof(link
->eh_info
));
2829 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
2830 spin_unlock_irqrestore(link
->ap
->lock
, flags
);
2832 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2833 ata_eh_thaw_port(ap
);
2836 * Make sure onlineness and classification result correspond.
2837 * Hotplug could have happened during reset and some
2838 * controllers fail to wait while a drive is spinning up after
2839 * being hotplugged causing misdetection. By cross checking
2840 * link on/offlineness and classification result, those
2841 * conditions can be reliably detected and retried.
2844 ata_for_each_dev(dev
, link
, ALL
) {
2845 if (ata_phys_link_online(ata_dev_phys_link(dev
))) {
2846 if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
2847 ata_dev_dbg(dev
, "link online but device misclassified\n");
2848 classes
[dev
->devno
] = ATA_DEV_NONE
;
2851 } else if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
2852 if (ata_class_enabled(classes
[dev
->devno
]))
2854 "link offline, clearing class %d to NONE\n",
2855 classes
[dev
->devno
]);
2856 classes
[dev
->devno
] = ATA_DEV_NONE
;
2857 } else if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
2859 "link status unknown, clearing UNKNOWN to NONE\n");
2860 classes
[dev
->devno
] = ATA_DEV_NONE
;
2864 if (classify
&& nr_unknown
) {
2865 if (try < max_tries
) {
2867 "link online but %d devices misclassified, retrying\n",
2874 "link online but %d devices misclassified, "
2875 "device detection might fail\n", nr_unknown
);
2878 /* reset successful, schedule revalidation */
2879 ata_eh_done(link
, NULL
, ATA_EH_RESET
);
2881 ata_eh_done(slave
, NULL
, ATA_EH_RESET
);
2882 ehc
->last_reset
= jiffies
; /* update to completion time */
2883 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2884 link
->lpm_policy
= ATA_LPM_UNKNOWN
; /* reset LPM state */
2888 /* clear hotplug flag */
2889 ehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2891 sehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2893 spin_lock_irqsave(ap
->lock
, flags
);
2894 ap
->pflags
&= ~ATA_PFLAG_RESETTING
;
2895 spin_unlock_irqrestore(ap
->lock
, flags
);
2900 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2901 if (!ata_is_host_link(link
) &&
2902 sata_scr_read(link
, SCR_STATUS
, &sstatus
))
2905 if (try >= max_tries
) {
2907 * Thaw host port even if reset failed, so that the port
2908 * can be retried on the next phy event. This risks
2909 * repeated EH runs but seems to be a better tradeoff than
2910 * shutting down a port after a botched hotplug attempt.
2912 if (ata_is_host_link(link
))
2913 ata_eh_thaw_port(ap
);
2918 if (time_before(now
, deadline
)) {
2919 unsigned long delta
= deadline
- now
;
2921 ata_link_warn(failed_link
,
2922 "reset failed (errno=%d), retrying in %u secs\n",
2923 rc
, DIV_ROUND_UP(jiffies_to_msecs(delta
), 1000));
2927 delta
= schedule_timeout_uninterruptible(delta
);
2932 * While disks spinup behind PMP, some controllers fail sending SRST.
2933 * They need to be reset - as well as the PMP - before retrying.
2935 if (rc
== -ERESTART
) {
2936 if (ata_is_host_link(link
))
2937 ata_eh_thaw_port(ap
);
2941 if (try == max_tries
- 1) {
2942 sata_down_spd_limit(link
, 0);
2944 sata_down_spd_limit(slave
, 0);
2945 } else if (rc
== -EPIPE
)
2946 sata_down_spd_limit(failed_link
, 0);
2953 static inline void ata_eh_pull_park_action(struct ata_port
*ap
)
2955 struct ata_link
*link
;
2956 struct ata_device
*dev
;
2957 unsigned long flags
;
2960 * This function can be thought of as an extended version of
2961 * ata_eh_about_to_do() specially crafted to accommodate the
2962 * requirements of ATA_EH_PARK handling. Since the EH thread
2963 * does not leave the do {} while () loop in ata_eh_recover as
2964 * long as the timeout for a park request to *one* device on
2965 * the port has not expired, and since we still want to pick
2966 * up park requests to other devices on the same port or
2967 * timeout updates for the same device, we have to pull
2968 * ATA_EH_PARK actions from eh_info into eh_context.i
2969 * ourselves at the beginning of each pass over the loop.
2971 * Additionally, all write accesses to &ap->park_req_pending
2972 * through INIT_COMPLETION() (see below) or complete_all()
2973 * (see ata_scsi_park_store()) are protected by the host lock.
2974 * As a result we have that park_req_pending.done is zero on
2975 * exit from this function, i.e. when ATA_EH_PARK actions for
2976 * *all* devices on port ap have been pulled into the
2977 * respective eh_context structs. If, and only if,
2978 * park_req_pending.done is non-zero by the time we reach
2979 * wait_for_completion_timeout(), another ATA_EH_PARK action
2980 * has been scheduled for at least one of the devices on port
2981 * ap and we have to cycle over the do {} while () loop in
2982 * ata_eh_recover() again.
2985 spin_lock_irqsave(ap
->lock
, flags
);
2986 INIT_COMPLETION(ap
->park_req_pending
);
2987 ata_for_each_link(link
, ap
, EDGE
) {
2988 ata_for_each_dev(dev
, link
, ALL
) {
2989 struct ata_eh_info
*ehi
= &link
->eh_info
;
2991 link
->eh_context
.i
.dev_action
[dev
->devno
] |=
2992 ehi
->dev_action
[dev
->devno
] & ATA_EH_PARK
;
2993 ata_eh_clear_action(link
, dev
, ehi
, ATA_EH_PARK
);
2996 spin_unlock_irqrestore(ap
->lock
, flags
);
2999 static void ata_eh_park_issue_cmd(struct ata_device
*dev
, int park
)
3001 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3002 struct ata_taskfile tf
;
3003 unsigned int err_mask
;
3005 ata_tf_init(dev
, &tf
);
3007 ehc
->unloaded_mask
|= 1 << dev
->devno
;
3008 tf
.command
= ATA_CMD_IDLEIMMEDIATE
;
3014 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
3015 tf
.command
= ATA_CMD_CHK_POWER
;
3018 tf
.flags
|= ATA_TFLAG_DEVICE
| ATA_TFLAG_ISADDR
;
3019 tf
.protocol
|= ATA_PROT_NODATA
;
3020 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
3021 if (park
&& (err_mask
|| tf
.lbal
!= 0xc4)) {
3022 ata_dev_err(dev
, "head unload failed!\n");
3023 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
3027 static int ata_eh_revalidate_and_attach(struct ata_link
*link
,
3028 struct ata_device
**r_failed_dev
)
3030 struct ata_port
*ap
= link
->ap
;
3031 struct ata_eh_context
*ehc
= &link
->eh_context
;
3032 struct ata_device
*dev
;
3033 unsigned int new_mask
= 0;
3034 unsigned long flags
;
3039 /* For PATA drive side cable detection to work, IDENTIFY must
3040 * be done backwards such that PDIAG- is released by the slave
3041 * device before the master device is identified.
3043 ata_for_each_dev(dev
, link
, ALL_REVERSE
) {
3044 unsigned int action
= ata_eh_dev_action(dev
);
3045 unsigned int readid_flags
= 0;
3047 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
3048 readid_flags
|= ATA_READID_POSTRESET
;
3050 if ((action
& ATA_EH_REVALIDATE
) && ata_dev_enabled(dev
)) {
3051 WARN_ON(dev
->class == ATA_DEV_PMP
);
3053 if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
3058 ata_eh_about_to_do(link
, dev
, ATA_EH_REVALIDATE
);
3059 rc
= ata_dev_revalidate(dev
, ehc
->classes
[dev
->devno
],
3064 ata_eh_done(link
, dev
, ATA_EH_REVALIDATE
);
3066 /* Configuration may have changed, reconfigure
3069 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
3071 /* schedule the scsi_rescan_device() here */
3072 schedule_work(&(ap
->scsi_rescan_task
));
3073 } else if (dev
->class == ATA_DEV_UNKNOWN
&&
3074 ehc
->tries
[dev
->devno
] &&
3075 ata_class_enabled(ehc
->classes
[dev
->devno
])) {
3076 /* Temporarily set dev->class, it will be
3077 * permanently set once all configurations are
3078 * complete. This is necessary because new
3079 * device configuration is done in two
3082 dev
->class = ehc
->classes
[dev
->devno
];
3084 if (dev
->class == ATA_DEV_PMP
)
3085 rc
= sata_pmp_attach(dev
);
3087 rc
= ata_dev_read_id(dev
, &dev
->class,
3088 readid_flags
, dev
->id
);
3090 /* read_id might have changed class, store and reset */
3091 ehc
->classes
[dev
->devno
] = dev
->class;
3092 dev
->class = ATA_DEV_UNKNOWN
;
3096 /* clear error info accumulated during probe */
3097 ata_ering_clear(&dev
->ering
);
3098 new_mask
|= 1 << dev
->devno
;
3101 /* IDENTIFY was issued to non-existent
3102 * device. No need to reset. Just
3103 * thaw and ignore the device.
3105 ata_eh_thaw_port(ap
);
3113 /* PDIAG- should have been released, ask cable type if post-reset */
3114 if ((ehc
->i
.flags
& ATA_EHI_DID_RESET
) && ata_is_host_link(link
)) {
3115 if (ap
->ops
->cable_detect
)
3116 ap
->cbl
= ap
->ops
->cable_detect(ap
);
3120 /* Configure new devices forward such that user doesn't see
3121 * device detection messages backwards.
3123 ata_for_each_dev(dev
, link
, ALL
) {
3124 if (!(new_mask
& (1 << dev
->devno
)))
3127 dev
->class = ehc
->classes
[dev
->devno
];
3129 if (dev
->class == ATA_DEV_PMP
)
3132 ehc
->i
.flags
|= ATA_EHI_PRINTINFO
;
3133 rc
= ata_dev_configure(dev
);
3134 ehc
->i
.flags
&= ~ATA_EHI_PRINTINFO
;
3136 dev
->class = ATA_DEV_UNKNOWN
;
3140 spin_lock_irqsave(ap
->lock
, flags
);
3141 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
3142 spin_unlock_irqrestore(ap
->lock
, flags
);
3144 /* new device discovered, configure xfermode */
3145 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
3151 *r_failed_dev
= dev
;
3152 DPRINTK("EXIT rc=%d\n", rc
);
3157 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3158 * @link: link on which timings will be programmed
3159 * @r_failed_dev: out parameter for failed device
3161 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3162 * ata_set_mode() fails, pointer to the failing device is
3163 * returned in @r_failed_dev.
3166 * PCI/etc. bus probe sem.
3169 * 0 on success, negative errno otherwise
3171 int ata_set_mode(struct ata_link
*link
, struct ata_device
**r_failed_dev
)
3173 struct ata_port
*ap
= link
->ap
;
3174 struct ata_device
*dev
;
3177 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
3178 ata_for_each_dev(dev
, link
, ENABLED
) {
3179 if (!(dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)) {
3180 struct ata_ering_entry
*ent
;
3182 ent
= ata_ering_top(&dev
->ering
);
3184 ent
->eflags
&= ~ATA_EFLAG_DUBIOUS_XFER
;
3188 /* has private set_mode? */
3189 if (ap
->ops
->set_mode
)
3190 rc
= ap
->ops
->set_mode(link
, r_failed_dev
);
3192 rc
= ata_do_set_mode(link
, r_failed_dev
);
3194 /* if transfer mode has changed, set DUBIOUS_XFER on device */
3195 ata_for_each_dev(dev
, link
, ENABLED
) {
3196 struct ata_eh_context
*ehc
= &link
->eh_context
;
3197 u8 saved_xfer_mode
= ehc
->saved_xfer_mode
[dev
->devno
];
3198 u8 saved_ncq
= !!(ehc
->saved_ncq_enabled
& (1 << dev
->devno
));
3200 if (dev
->xfer_mode
!= saved_xfer_mode
||
3201 ata_ncq_enabled(dev
) != saved_ncq
)
3202 dev
->flags
|= ATA_DFLAG_DUBIOUS_XFER
;
3209 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3210 * @dev: ATAPI device to clear UA for
3212 * Resets and other operations can make an ATAPI device raise
3213 * UNIT ATTENTION which causes the next operation to fail. This
3214 * function clears UA.
3217 * EH context (may sleep).
3220 * 0 on success, -errno on failure.
3222 static int atapi_eh_clear_ua(struct ata_device
*dev
)
3226 for (i
= 0; i
< ATA_EH_UA_TRIES
; i
++) {
3227 u8
*sense_buffer
= dev
->link
->ap
->sector_buf
;
3229 unsigned int err_mask
;
3231 err_mask
= atapi_eh_tur(dev
, &sense_key
);
3232 if (err_mask
!= 0 && err_mask
!= AC_ERR_DEV
) {
3234 "TEST_UNIT_READY failed (err_mask=0x%x)\n",
3239 if (!err_mask
|| sense_key
!= UNIT_ATTENTION
)
3242 err_mask
= atapi_eh_request_sense(dev
, sense_buffer
, sense_key
);
3244 ata_dev_warn(dev
, "failed to clear "
3245 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask
);
3250 ata_dev_warn(dev
, "UNIT ATTENTION persists after %d tries\n",
3257 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3258 * @dev: ATA device which may need FLUSH retry
3260 * If @dev failed FLUSH, it needs to be reported upper layer
3261 * immediately as it means that @dev failed to remap and already
3262 * lost at least a sector and further FLUSH retrials won't make
3263 * any difference to the lost sector. However, if FLUSH failed
3264 * for other reasons, for example transmission error, FLUSH needs
3267 * This function determines whether FLUSH failure retry is
3268 * necessary and performs it if so.
3271 * 0 if EH can continue, -errno if EH needs to be repeated.
3273 static int ata_eh_maybe_retry_flush(struct ata_device
*dev
)
3275 struct ata_link
*link
= dev
->link
;
3276 struct ata_port
*ap
= link
->ap
;
3277 struct ata_queued_cmd
*qc
;
3278 struct ata_taskfile tf
;
3279 unsigned int err_mask
;
3282 /* did flush fail for this device? */
3283 if (!ata_tag_valid(link
->active_tag
))
3286 qc
= __ata_qc_from_tag(ap
, link
->active_tag
);
3287 if (qc
->dev
!= dev
|| (qc
->tf
.command
!= ATA_CMD_FLUSH_EXT
&&
3288 qc
->tf
.command
!= ATA_CMD_FLUSH
))
3291 /* if the device failed it, it should be reported to upper layers */
3292 if (qc
->err_mask
& AC_ERR_DEV
)
3295 /* flush failed for some other reason, give it another shot */
3296 ata_tf_init(dev
, &tf
);
3298 tf
.command
= qc
->tf
.command
;
3299 tf
.flags
|= ATA_TFLAG_DEVICE
;
3300 tf
.protocol
= ATA_PROT_NODATA
;
3302 ata_dev_warn(dev
, "retrying FLUSH 0x%x Emask 0x%x\n",
3303 tf
.command
, qc
->err_mask
);
3305 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
3308 * FLUSH is complete but there's no way to
3309 * successfully complete a failed command from EH.
3310 * Making sure retry is allowed at least once and
3311 * retrying it should do the trick - whatever was in
3312 * the cache is already on the platter and this won't
3313 * cause infinite loop.
3315 qc
->scsicmd
->allowed
= max(qc
->scsicmd
->allowed
, 1);
3317 ata_dev_warn(dev
, "FLUSH failed Emask 0x%x\n",
3321 /* if device failed it, report it to upper layers */
3322 if (err_mask
& AC_ERR_DEV
) {
3323 qc
->err_mask
|= AC_ERR_DEV
;
3325 if (!(ap
->pflags
& ATA_PFLAG_FROZEN
))
3333 * ata_eh_set_lpm - configure SATA interface power management
3334 * @link: link to configure power management
3335 * @policy: the link power management policy
3336 * @r_failed_dev: out parameter for failed device
3338 * Enable SATA Interface power management. This will enable
3339 * Device Interface Power Management (DIPM) for min_power
3340 * policy, and then call driver specific callbacks for
3341 * enabling Host Initiated Power management.
3347 * 0 on success, -errno on failure.
3349 static int ata_eh_set_lpm(struct ata_link
*link
, enum ata_lpm_policy policy
,
3350 struct ata_device
**r_failed_dev
)
3352 struct ata_port
*ap
= ata_is_host_link(link
) ? link
->ap
: NULL
;
3353 struct ata_eh_context
*ehc
= &link
->eh_context
;
3354 struct ata_device
*dev
, *link_dev
= NULL
, *lpm_dev
= NULL
;
3355 enum ata_lpm_policy old_policy
= link
->lpm_policy
;
3356 bool no_dipm
= link
->ap
->flags
& ATA_FLAG_NO_DIPM
;
3357 unsigned int hints
= ATA_LPM_EMPTY
| ATA_LPM_HIPM
;
3358 unsigned int err_mask
;
3361 /* if the link or host doesn't do LPM, noop */
3362 if ((link
->flags
& ATA_LFLAG_NO_LPM
) || (ap
&& !ap
->ops
->set_lpm
))
3366 * DIPM is enabled only for MIN_POWER as some devices
3367 * misbehave when the host NACKs transition to SLUMBER. Order
3368 * device and link configurations such that the host always
3369 * allows DIPM requests.
3371 ata_for_each_dev(dev
, link
, ENABLED
) {
3372 bool hipm
= ata_id_has_hipm(dev
->id
);
3373 bool dipm
= ata_id_has_dipm(dev
->id
) && !no_dipm
;
3375 /* find the first enabled and LPM enabled devices */
3379 if (!lpm_dev
&& (hipm
|| dipm
))
3382 hints
&= ~ATA_LPM_EMPTY
;
3384 hints
&= ~ATA_LPM_HIPM
;
3386 /* disable DIPM before changing link config */
3387 if (policy
!= ATA_LPM_MIN_POWER
&& dipm
) {
3388 err_mask
= ata_dev_set_feature(dev
,
3389 SETFEATURES_SATA_DISABLE
, SATA_DIPM
);
3390 if (err_mask
&& err_mask
!= AC_ERR_DEV
) {
3392 "failed to disable DIPM, Emask 0x%x\n",
3401 rc
= ap
->ops
->set_lpm(link
, policy
, hints
);
3402 if (!rc
&& ap
->slave_link
)
3403 rc
= ap
->ops
->set_lpm(ap
->slave_link
, policy
, hints
);
3405 rc
= sata_pmp_set_lpm(link
, policy
, hints
);
3408 * Attribute link config failure to the first (LPM) enabled
3409 * device on the link.
3412 if (rc
== -EOPNOTSUPP
) {
3413 link
->flags
|= ATA_LFLAG_NO_LPM
;
3416 dev
= lpm_dev
? lpm_dev
: link_dev
;
3421 * Low level driver acked the transition. Issue DIPM command
3422 * with the new policy set.
3424 link
->lpm_policy
= policy
;
3425 if (ap
&& ap
->slave_link
)
3426 ap
->slave_link
->lpm_policy
= policy
;
3428 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3429 ata_for_each_dev(dev
, link
, ENABLED
) {
3430 if (policy
== ATA_LPM_MIN_POWER
&& !no_dipm
&&
3431 ata_id_has_dipm(dev
->id
)) {
3432 err_mask
= ata_dev_set_feature(dev
,
3433 SETFEATURES_SATA_ENABLE
, SATA_DIPM
);
3434 if (err_mask
&& err_mask
!= AC_ERR_DEV
) {
3436 "failed to enable DIPM, Emask 0x%x\n",
3447 /* restore the old policy */
3448 link
->lpm_policy
= old_policy
;
3449 if (ap
&& ap
->slave_link
)
3450 ap
->slave_link
->lpm_policy
= old_policy
;
3452 /* if no device or only one more chance is left, disable LPM */
3453 if (!dev
|| ehc
->tries
[dev
->devno
] <= 2) {
3454 ata_link_warn(link
, "disabling LPM on the link\n");
3455 link
->flags
|= ATA_LFLAG_NO_LPM
;
3458 *r_failed_dev
= dev
;
3462 int ata_link_nr_enabled(struct ata_link
*link
)
3464 struct ata_device
*dev
;
3467 ata_for_each_dev(dev
, link
, ENABLED
)
3472 static int ata_link_nr_vacant(struct ata_link
*link
)
3474 struct ata_device
*dev
;
3477 ata_for_each_dev(dev
, link
, ALL
)
3478 if (dev
->class == ATA_DEV_UNKNOWN
)
3483 static int ata_eh_skip_recovery(struct ata_link
*link
)
3485 struct ata_port
*ap
= link
->ap
;
3486 struct ata_eh_context
*ehc
= &link
->eh_context
;
3487 struct ata_device
*dev
;
3489 /* skip disabled links */
3490 if (link
->flags
& ATA_LFLAG_DISABLED
)
3493 /* skip if explicitly requested */
3494 if (ehc
->i
.flags
& ATA_EHI_NO_RECOVERY
)
3497 /* thaw frozen port and recover failed devices */
3498 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) || ata_link_nr_enabled(link
))
3501 /* reset at least once if reset is requested */
3502 if ((ehc
->i
.action
& ATA_EH_RESET
) &&
3503 !(ehc
->i
.flags
& ATA_EHI_DID_RESET
))
3506 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
3507 ata_for_each_dev(dev
, link
, ALL
) {
3508 if (dev
->class == ATA_DEV_UNKNOWN
&&
3509 ehc
->classes
[dev
->devno
] != ATA_DEV_NONE
)
3516 static int ata_count_probe_trials_cb(struct ata_ering_entry
*ent
, void *void_arg
)
3518 u64 interval
= msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL
);
3519 u64 now
= get_jiffies_64();
3520 int *trials
= void_arg
;
3522 if ((ent
->eflags
& ATA_EFLAG_OLD_ER
) ||
3523 (ent
->timestamp
< now
- min(now
, interval
)))
3530 static int ata_eh_schedule_probe(struct ata_device
*dev
)
3532 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3533 struct ata_link
*link
= ata_dev_phys_link(dev
);
3536 if (!(ehc
->i
.probe_mask
& (1 << dev
->devno
)) ||
3537 (ehc
->did_probe_mask
& (1 << dev
->devno
)))
3540 ata_eh_detach_dev(dev
);
3542 ehc
->did_probe_mask
|= (1 << dev
->devno
);
3543 ehc
->i
.action
|= ATA_EH_RESET
;
3544 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
3545 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
3547 /* the link maybe in a deep sleep, wake it up */
3548 if (link
->lpm_policy
> ATA_LPM_MAX_POWER
) {
3549 if (ata_is_host_link(link
))
3550 link
->ap
->ops
->set_lpm(link
, ATA_LPM_MAX_POWER
,
3553 sata_pmp_set_lpm(link
, ATA_LPM_MAX_POWER
,
3557 /* Record and count probe trials on the ering. The specific
3558 * error mask used is irrelevant. Because a successful device
3559 * detection clears the ering, this count accumulates only if
3560 * there are consecutive failed probes.
3562 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3563 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3564 * forced to 1.5Gbps.
3566 * This is to work around cases where failed link speed
3567 * negotiation results in device misdetection leading to
3568 * infinite DEVXCHG or PHRDY CHG events.
3570 ata_ering_record(&dev
->ering
, 0, AC_ERR_OTHER
);
3571 ata_ering_map(&dev
->ering
, ata_count_probe_trials_cb
, &trials
);
3573 if (trials
> ATA_EH_PROBE_TRIALS
)
3574 sata_down_spd_limit(link
, 1);
3579 static int ata_eh_handle_dev_fail(struct ata_device
*dev
, int err
)
3581 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3583 /* -EAGAIN from EH routine indicates retry without prejudice.
3584 * The requester is responsible for ensuring forward progress.
3587 ehc
->tries
[dev
->devno
]--;
3591 /* device missing or wrong IDENTIFY data, schedule probing */
3592 ehc
->i
.probe_mask
|= (1 << dev
->devno
);
3594 /* give it just one more chance */
3595 ehc
->tries
[dev
->devno
] = min(ehc
->tries
[dev
->devno
], 1);
3597 if (ehc
->tries
[dev
->devno
] == 1) {
3598 /* This is the last chance, better to slow
3599 * down than lose it.
3601 sata_down_spd_limit(ata_dev_phys_link(dev
), 0);
3602 if (dev
->pio_mode
> XFER_PIO_0
)
3603 ata_down_xfermask_limit(dev
, ATA_DNXFER_PIO
);
3607 if (ata_dev_enabled(dev
) && !ehc
->tries
[dev
->devno
]) {
3608 /* disable device if it has used up all its chances */
3609 ata_dev_disable(dev
);
3611 /* detach if offline */
3612 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
3613 ata_eh_detach_dev(dev
);
3615 /* schedule probe if necessary */
3616 if (ata_eh_schedule_probe(dev
)) {
3617 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3618 memset(ehc
->cmd_timeout_idx
[dev
->devno
], 0,
3619 sizeof(ehc
->cmd_timeout_idx
[dev
->devno
]));
3624 ehc
->i
.action
|= ATA_EH_RESET
;
3630 * ata_eh_recover - recover host port after error
3631 * @ap: host port to recover
3632 * @prereset: prereset method (can be NULL)
3633 * @softreset: softreset method (can be NULL)
3634 * @hardreset: hardreset method (can be NULL)
3635 * @postreset: postreset method (can be NULL)
3636 * @r_failed_link: out parameter for failed link
3638 * This is the alpha and omega, eum and yang, heart and soul of
3639 * libata exception handling. On entry, actions required to
3640 * recover each link and hotplug requests are recorded in the
3641 * link's eh_context. This function executes all the operations
3642 * with appropriate retrials and fallbacks to resurrect failed
3643 * devices, detach goners and greet newcomers.
3646 * Kernel thread context (may sleep).
3649 * 0 on success, -errno on failure.
3651 int ata_eh_recover(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3652 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3653 ata_postreset_fn_t postreset
,
3654 struct ata_link
**r_failed_link
)
3656 struct ata_link
*link
;
3657 struct ata_device
*dev
;
3659 unsigned long flags
, deadline
;
3663 /* prep for recovery */
3664 ata_for_each_link(link
, ap
, EDGE
) {
3665 struct ata_eh_context
*ehc
= &link
->eh_context
;
3667 /* re-enable link? */
3668 if (ehc
->i
.action
& ATA_EH_ENABLE_LINK
) {
3669 ata_eh_about_to_do(link
, NULL
, ATA_EH_ENABLE_LINK
);
3670 spin_lock_irqsave(ap
->lock
, flags
);
3671 link
->flags
&= ~ATA_LFLAG_DISABLED
;
3672 spin_unlock_irqrestore(ap
->lock
, flags
);
3673 ata_eh_done(link
, NULL
, ATA_EH_ENABLE_LINK
);
3676 ata_for_each_dev(dev
, link
, ALL
) {
3677 if (link
->flags
& ATA_LFLAG_NO_RETRY
)
3678 ehc
->tries
[dev
->devno
] = 1;
3680 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3682 /* collect port action mask recorded in dev actions */
3683 ehc
->i
.action
|= ehc
->i
.dev_action
[dev
->devno
] &
3684 ~ATA_EH_PERDEV_MASK
;
3685 ehc
->i
.dev_action
[dev
->devno
] &= ATA_EH_PERDEV_MASK
;
3687 /* process hotplug request */
3688 if (dev
->flags
& ATA_DFLAG_DETACH
)
3689 ata_eh_detach_dev(dev
);
3691 /* schedule probe if necessary */
3692 if (!ata_dev_enabled(dev
))
3693 ata_eh_schedule_probe(dev
);
3700 /* if UNLOADING, finish immediately */
3701 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
3705 ata_for_each_link(link
, ap
, EDGE
) {
3706 struct ata_eh_context
*ehc
= &link
->eh_context
;
3708 /* skip EH if possible. */
3709 if (ata_eh_skip_recovery(link
))
3712 ata_for_each_dev(dev
, link
, ALL
)
3713 ehc
->classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
3717 ata_for_each_link(link
, ap
, EDGE
) {
3718 struct ata_eh_context
*ehc
= &link
->eh_context
;
3720 if (!(ehc
->i
.action
& ATA_EH_RESET
))
3723 rc
= ata_eh_reset(link
, ata_link_nr_vacant(link
),
3724 prereset
, softreset
, hardreset
, postreset
);
3726 ata_link_err(link
, "reset failed, giving up\n");
3735 * clears ATA_EH_PARK in eh_info and resets
3736 * ap->park_req_pending
3738 ata_eh_pull_park_action(ap
);
3741 ata_for_each_link(link
, ap
, EDGE
) {
3742 ata_for_each_dev(dev
, link
, ALL
) {
3743 struct ata_eh_context
*ehc
= &link
->eh_context
;
3746 if (dev
->class != ATA_DEV_ATA
)
3748 if (!(ehc
->i
.dev_action
[dev
->devno
] &
3751 tmp
= dev
->unpark_deadline
;
3752 if (time_before(deadline
, tmp
))
3754 else if (time_before_eq(tmp
, jiffies
))
3756 if (ehc
->unloaded_mask
& (1 << dev
->devno
))
3759 ata_eh_park_issue_cmd(dev
, 1);
3764 if (time_before_eq(deadline
, now
))
3768 deadline
= wait_for_completion_timeout(&ap
->park_req_pending
,
3772 ata_for_each_link(link
, ap
, EDGE
) {
3773 ata_for_each_dev(dev
, link
, ALL
) {
3774 if (!(link
->eh_context
.unloaded_mask
&
3778 ata_eh_park_issue_cmd(dev
, 0);
3779 ata_eh_done(link
, dev
, ATA_EH_PARK
);
3785 ata_for_each_link(link
, ap
, PMP_FIRST
) {
3786 struct ata_eh_context
*ehc
= &link
->eh_context
;
3788 if (sata_pmp_attached(ap
) && ata_is_host_link(link
))
3791 /* revalidate existing devices and attach new ones */
3792 rc
= ata_eh_revalidate_and_attach(link
, &dev
);
3796 /* if PMP got attached, return, pmp EH will take care of it */
3797 if (link
->device
->class == ATA_DEV_PMP
) {
3802 /* configure transfer mode if necessary */
3803 if (ehc
->i
.flags
& ATA_EHI_SETMODE
) {
3804 rc
= ata_set_mode(link
, &dev
);
3807 ehc
->i
.flags
&= ~ATA_EHI_SETMODE
;
3810 /* If reset has been issued, clear UA to avoid
3811 * disrupting the current users of the device.
3813 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
3814 ata_for_each_dev(dev
, link
, ALL
) {
3815 if (dev
->class != ATA_DEV_ATAPI
)
3817 rc
= atapi_eh_clear_ua(dev
);
3823 /* retry flush if necessary */
3824 ata_for_each_dev(dev
, link
, ALL
) {
3825 if (dev
->class != ATA_DEV_ATA
)
3827 rc
= ata_eh_maybe_retry_flush(dev
);
3833 /* configure link power saving */
3834 if (link
->lpm_policy
!= ap
->target_lpm_policy
) {
3835 rc
= ata_eh_set_lpm(link
, ap
->target_lpm_policy
, &dev
);
3840 /* this link is okay now */
3847 ata_eh_handle_dev_fail(dev
, rc
);
3849 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
3850 /* PMP reset requires working host port.
3851 * Can't retry if it's frozen.
3853 if (sata_pmp_attached(ap
))
3863 if (rc
&& r_failed_link
)
3864 *r_failed_link
= link
;
3866 DPRINTK("EXIT, rc=%d\n", rc
);
3871 * ata_eh_finish - finish up EH
3872 * @ap: host port to finish EH for
3874 * Recovery is complete. Clean up EH states and retry or finish
3880 void ata_eh_finish(struct ata_port
*ap
)
3884 /* retry or finish qcs */
3885 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
3886 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
3888 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
3892 /* FIXME: Once EH migration is complete,
3893 * generate sense data in this function,
3894 * considering both err_mask and tf.
3896 if (qc
->flags
& ATA_QCFLAG_RETRY
)
3897 ata_eh_qc_retry(qc
);
3899 ata_eh_qc_complete(qc
);
3901 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
3902 ata_eh_qc_complete(qc
);
3904 /* feed zero TF to sense generation */
3905 memset(&qc
->result_tf
, 0, sizeof(qc
->result_tf
));
3906 ata_eh_qc_retry(qc
);
3911 /* make sure nr_active_links is zero after EH */
3912 WARN_ON(ap
->nr_active_links
);
3913 ap
->nr_active_links
= 0;
3917 * ata_do_eh - do standard error handling
3918 * @ap: host port to handle error for
3920 * @prereset: prereset method (can be NULL)
3921 * @softreset: softreset method (can be NULL)
3922 * @hardreset: hardreset method (can be NULL)
3923 * @postreset: postreset method (can be NULL)
3925 * Perform standard error handling sequence.
3928 * Kernel thread context (may sleep).
3930 void ata_do_eh(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3931 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3932 ata_postreset_fn_t postreset
)
3934 struct ata_device
*dev
;
3940 rc
= ata_eh_recover(ap
, prereset
, softreset
, hardreset
, postreset
,
3943 ata_for_each_dev(dev
, &ap
->link
, ALL
)
3944 ata_dev_disable(dev
);
3951 * ata_std_error_handler - standard error handler
3952 * @ap: host port to handle error for
3954 * Standard error handler
3957 * Kernel thread context (may sleep).
3959 void ata_std_error_handler(struct ata_port
*ap
)
3961 struct ata_port_operations
*ops
= ap
->ops
;
3962 ata_reset_fn_t hardreset
= ops
->hardreset
;
3964 /* ignore built-in hardreset if SCR access is not available */
3965 if (hardreset
== sata_std_hardreset
&& !sata_scr_valid(&ap
->link
))
3968 ata_do_eh(ap
, ops
->prereset
, ops
->softreset
, hardreset
, ops
->postreset
);
3973 * ata_eh_handle_port_suspend - perform port suspend operation
3974 * @ap: port to suspend
3979 * Kernel thread context (may sleep).
3981 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
3983 unsigned long flags
;
3986 /* are we suspending? */
3987 spin_lock_irqsave(ap
->lock
, flags
);
3988 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
3989 ap
->pm_mesg
.event
== PM_EVENT_ON
) {
3990 spin_unlock_irqrestore(ap
->lock
, flags
);
3993 spin_unlock_irqrestore(ap
->lock
, flags
);
3995 WARN_ON(ap
->pflags
& ATA_PFLAG_SUSPENDED
);
3997 /* tell ACPI we're suspending */
3998 rc
= ata_acpi_on_suspend(ap
);
4003 ata_eh_freeze_port(ap
);
4005 if (ap
->ops
->port_suspend
)
4006 rc
= ap
->ops
->port_suspend(ap
, ap
->pm_mesg
);
4008 ata_acpi_set_state(ap
, PMSG_SUSPEND
);
4011 spin_lock_irqsave(ap
->lock
, flags
);
4013 ap
->pflags
&= ~ATA_PFLAG_PM_PENDING
;
4015 ap
->pflags
|= ATA_PFLAG_SUSPENDED
;
4016 else if (ap
->pflags
& ATA_PFLAG_FROZEN
)
4017 ata_port_schedule_eh(ap
);
4019 if (ap
->pm_result
) {
4020 *ap
->pm_result
= rc
;
4021 ap
->pm_result
= NULL
;
4024 spin_unlock_irqrestore(ap
->lock
, flags
);
4030 * ata_eh_handle_port_resume - perform port resume operation
4031 * @ap: port to resume
4036 * Kernel thread context (may sleep).
4038 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
4040 struct ata_link
*link
;
4041 struct ata_device
*dev
;
4042 unsigned long flags
;
4045 /* are we resuming? */
4046 spin_lock_irqsave(ap
->lock
, flags
);
4047 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
4048 ap
->pm_mesg
.event
!= PM_EVENT_ON
) {
4049 spin_unlock_irqrestore(ap
->lock
, flags
);
4052 spin_unlock_irqrestore(ap
->lock
, flags
);
4054 WARN_ON(!(ap
->pflags
& ATA_PFLAG_SUSPENDED
));
4057 * Error timestamps are in jiffies which doesn't run while
4058 * suspended and PHY events during resume isn't too uncommon.
4059 * When the two are combined, it can lead to unnecessary speed
4060 * downs if the machine is suspended and resumed repeatedly.
4061 * Clear error history.
4063 ata_for_each_link(link
, ap
, HOST_FIRST
)
4064 ata_for_each_dev(dev
, link
, ALL
)
4065 ata_ering_clear(&dev
->ering
);
4067 ata_acpi_set_state(ap
, PMSG_ON
);
4069 if (ap
->ops
->port_resume
)
4070 rc
= ap
->ops
->port_resume(ap
);
4072 /* tell ACPI that we're resuming */
4073 ata_acpi_on_resume(ap
);
4076 spin_lock_irqsave(ap
->lock
, flags
);
4077 ap
->pflags
&= ~(ATA_PFLAG_PM_PENDING
| ATA_PFLAG_SUSPENDED
);
4078 if (ap
->pm_result
) {
4079 *ap
->pm_result
= rc
;
4080 ap
->pm_result
= NULL
;
4082 spin_unlock_irqrestore(ap
->lock
, flags
);
4084 #endif /* CONFIG_PM */