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/pci.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_host.h>
40 #include <scsi/scsi_eh.h>
41 #include <scsi/scsi_device.h>
42 #include <scsi/scsi_cmnd.h>
43 #include "../scsi/scsi_transport_api.h"
45 #include <linux/libata.h>
50 /* speed down verdicts */
51 ATA_EH_SPDN_NCQ_OFF
= (1 << 0),
52 ATA_EH_SPDN_SPEED_DOWN
= (1 << 1),
53 ATA_EH_SPDN_FALLBACK_TO_PIO
= (1 << 2),
54 ATA_EH_SPDN_KEEP_ERRORS
= (1 << 3),
57 ATA_EFLAG_IS_IO
= (1 << 0),
58 ATA_EFLAG_DUBIOUS_XFER
= (1 << 1),
60 /* error categories */
63 ATA_ECAT_TOUT_HSM
= 2,
65 ATA_ECAT_DUBIOUS_NONE
= 4,
66 ATA_ECAT_DUBIOUS_ATA_BUS
= 5,
67 ATA_ECAT_DUBIOUS_TOUT_HSM
= 6,
68 ATA_ECAT_DUBIOUS_UNK_DEV
= 7,
71 ATA_EH_CMD_DFL_TIMEOUT
= 5000,
73 /* always put at least this amount of time between resets */
74 ATA_EH_RESET_COOL_DOWN
= 5000,
76 /* Waiting in ->prereset can never be reliable. It's
77 * sometimes nice to wait there but it can't be depended upon;
78 * otherwise, we wouldn't be resetting. Just give it enough
79 * time for most drives to spin up.
81 ATA_EH_PRERESET_TIMEOUT
= 10000,
82 ATA_EH_FASTDRAIN_INTERVAL
= 3000,
86 /* probe speed down parameters, see ata_eh_schedule_probe() */
87 ATA_EH_PROBE_TRIAL_INTERVAL
= 60000, /* 1 min */
88 ATA_EH_PROBE_TRIALS
= 2,
91 /* The following table determines how we sequence resets. Each entry
92 * represents timeout for that try. The first try can be soft or
93 * hardreset. All others are hardreset if available. In most cases
94 * the first reset w/ 10sec timeout should succeed. Following entries
95 * are mostly for error handling, hotplug and retarded devices.
97 static const unsigned long ata_eh_reset_timeouts
[] = {
98 10000, /* most drives spin up by 10sec */
99 10000, /* > 99% working drives spin up before 20sec */
100 35000, /* give > 30 secs of idleness for retarded devices */
101 5000, /* and sweet one last chance */
102 ULONG_MAX
, /* > 1 min has elapsed, give up */
105 static const unsigned long ata_eh_identify_timeouts
[] = {
106 5000, /* covers > 99% of successes and not too boring on failures */
107 10000, /* combined time till here is enough even for media access */
108 30000, /* for true idiots */
112 static const unsigned long ata_eh_other_timeouts
[] = {
113 5000, /* same rationale as identify timeout */
115 /* but no merciful 30sec for other commands, it just isn't worth it */
119 struct ata_eh_cmd_timeout_ent
{
121 const unsigned long *timeouts
;
124 /* The following table determines timeouts to use for EH internal
125 * commands. Each table entry is a command class and matches the
126 * commands the entry applies to and the timeout table to use.
128 * On the retry after a command timed out, the next timeout value from
129 * the table is used. If the table doesn't contain further entries,
130 * the last value is used.
132 * ehc->cmd_timeout_idx keeps track of which timeout to use per
133 * command class, so if SET_FEATURES times out on the first try, the
134 * next try will use the second timeout value only for that class.
136 #define CMDS(cmds...) (const u8 []){ cmds, 0 }
137 static const struct ata_eh_cmd_timeout_ent
138 ata_eh_cmd_timeout_table
[ATA_EH_CMD_TIMEOUT_TABLE_SIZE
] = {
139 { .commands
= CMDS(ATA_CMD_ID_ATA
, ATA_CMD_ID_ATAPI
),
140 .timeouts
= ata_eh_identify_timeouts
, },
141 { .commands
= CMDS(ATA_CMD_READ_NATIVE_MAX
, ATA_CMD_READ_NATIVE_MAX_EXT
),
142 .timeouts
= ata_eh_other_timeouts
, },
143 { .commands
= CMDS(ATA_CMD_SET_MAX
, ATA_CMD_SET_MAX_EXT
),
144 .timeouts
= ata_eh_other_timeouts
, },
145 { .commands
= CMDS(ATA_CMD_SET_FEATURES
),
146 .timeouts
= ata_eh_other_timeouts
, },
147 { .commands
= CMDS(ATA_CMD_INIT_DEV_PARAMS
),
148 .timeouts
= ata_eh_other_timeouts
, },
152 static void __ata_port_freeze(struct ata_port
*ap
);
154 static void ata_eh_handle_port_suspend(struct ata_port
*ap
);
155 static void ata_eh_handle_port_resume(struct ata_port
*ap
);
156 #else /* CONFIG_PM */
157 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
160 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
162 #endif /* CONFIG_PM */
164 static void __ata_ehi_pushv_desc(struct ata_eh_info
*ehi
, const char *fmt
,
167 ehi
->desc_len
+= vscnprintf(ehi
->desc
+ ehi
->desc_len
,
168 ATA_EH_DESC_LEN
- ehi
->desc_len
,
173 * __ata_ehi_push_desc - push error description without adding separator
175 * @fmt: printf format string
177 * Format string according to @fmt and append it to @ehi->desc.
180 * spin_lock_irqsave(host lock)
182 void __ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
187 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
192 * ata_ehi_push_desc - push error description with separator
194 * @fmt: printf format string
196 * Format string according to @fmt and append it to @ehi->desc.
197 * If @ehi->desc is not empty, ", " is added in-between.
200 * spin_lock_irqsave(host lock)
202 void ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
207 __ata_ehi_push_desc(ehi
, ", ");
210 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
215 * ata_ehi_clear_desc - clean error description
221 * spin_lock_irqsave(host lock)
223 void ata_ehi_clear_desc(struct ata_eh_info
*ehi
)
230 * ata_port_desc - append port description
231 * @ap: target ATA port
232 * @fmt: printf format string
234 * Format string according to @fmt and append it to port
235 * description. If port description is not empty, " " is added
236 * in-between. This function is to be used while initializing
237 * ata_host. The description is printed on host registration.
242 void ata_port_desc(struct ata_port
*ap
, const char *fmt
, ...)
246 WARN_ON(!(ap
->pflags
& ATA_PFLAG_INITIALIZING
));
248 if (ap
->link
.eh_info
.desc_len
)
249 __ata_ehi_push_desc(&ap
->link
.eh_info
, " ");
252 __ata_ehi_pushv_desc(&ap
->link
.eh_info
, fmt
, args
);
259 * ata_port_pbar_desc - append PCI BAR description
260 * @ap: target ATA port
261 * @bar: target PCI BAR
262 * @offset: offset into PCI BAR
263 * @name: name of the area
265 * If @offset is negative, this function formats a string which
266 * contains the name, address, size and type of the BAR and
267 * appends it to the port description. If @offset is zero or
268 * positive, only name and offsetted address is appended.
273 void ata_port_pbar_desc(struct ata_port
*ap
, int bar
, ssize_t offset
,
276 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
278 unsigned long long start
, len
;
280 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
282 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
285 start
= (unsigned long long)pci_resource_start(pdev
, bar
);
286 len
= (unsigned long long)pci_resource_len(pdev
, bar
);
289 ata_port_desc(ap
, "%s %s%llu@0x%llx", name
, type
, len
, start
);
291 ata_port_desc(ap
, "%s 0x%llx", name
,
292 start
+ (unsigned long long)offset
);
295 #endif /* CONFIG_PCI */
297 static int ata_lookup_timeout_table(u8 cmd
)
301 for (i
= 0; i
< ATA_EH_CMD_TIMEOUT_TABLE_SIZE
; i
++) {
304 for (cur
= ata_eh_cmd_timeout_table
[i
].commands
; *cur
; cur
++)
313 * ata_internal_cmd_timeout - determine timeout for an internal command
314 * @dev: target device
315 * @cmd: internal command to be issued
317 * Determine timeout for internal command @cmd for @dev.
323 * Determined timeout.
325 unsigned long ata_internal_cmd_timeout(struct ata_device
*dev
, u8 cmd
)
327 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
328 int ent
= ata_lookup_timeout_table(cmd
);
332 return ATA_EH_CMD_DFL_TIMEOUT
;
334 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
335 return ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
];
339 * ata_internal_cmd_timed_out - notification for internal command timeout
340 * @dev: target device
341 * @cmd: internal command which timed out
343 * Notify EH that internal command @cmd for @dev timed out. This
344 * function should be called only for commands whose timeouts are
345 * determined using ata_internal_cmd_timeout().
350 void ata_internal_cmd_timed_out(struct ata_device
*dev
, u8 cmd
)
352 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
353 int ent
= ata_lookup_timeout_table(cmd
);
359 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
360 if (ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
+ 1] != ULONG_MAX
)
361 ehc
->cmd_timeout_idx
[dev
->devno
][ent
]++;
364 static void ata_ering_record(struct ata_ering
*ering
, unsigned int eflags
,
365 unsigned int err_mask
)
367 struct ata_ering_entry
*ent
;
372 ering
->cursor
%= ATA_ERING_SIZE
;
374 ent
= &ering
->ring
[ering
->cursor
];
375 ent
->eflags
= eflags
;
376 ent
->err_mask
= err_mask
;
377 ent
->timestamp
= get_jiffies_64();
380 static struct ata_ering_entry
*ata_ering_top(struct ata_ering
*ering
)
382 struct ata_ering_entry
*ent
= &ering
->ring
[ering
->cursor
];
389 static void ata_ering_clear(struct ata_ering
*ering
)
391 memset(ering
, 0, sizeof(*ering
));
394 static int ata_ering_map(struct ata_ering
*ering
,
395 int (*map_fn
)(struct ata_ering_entry
*, void *),
399 struct ata_ering_entry
*ent
;
403 ent
= &ering
->ring
[idx
];
406 rc
= map_fn(ent
, arg
);
409 idx
= (idx
- 1 + ATA_ERING_SIZE
) % ATA_ERING_SIZE
;
410 } while (idx
!= ering
->cursor
);
415 static unsigned int ata_eh_dev_action(struct ata_device
*dev
)
417 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
419 return ehc
->i
.action
| ehc
->i
.dev_action
[dev
->devno
];
422 static void ata_eh_clear_action(struct ata_link
*link
, struct ata_device
*dev
,
423 struct ata_eh_info
*ehi
, unsigned int action
)
425 struct ata_device
*tdev
;
428 ehi
->action
&= ~action
;
429 ata_for_each_dev(tdev
, link
, ALL
)
430 ehi
->dev_action
[tdev
->devno
] &= ~action
;
432 /* doesn't make sense for port-wide EH actions */
433 WARN_ON(!(action
& ATA_EH_PERDEV_MASK
));
435 /* break ehi->action into ehi->dev_action */
436 if (ehi
->action
& action
) {
437 ata_for_each_dev(tdev
, link
, ALL
)
438 ehi
->dev_action
[tdev
->devno
] |=
439 ehi
->action
& action
;
440 ehi
->action
&= ~action
;
443 /* turn off the specified per-dev action */
444 ehi
->dev_action
[dev
->devno
] &= ~action
;
449 * ata_scsi_timed_out - SCSI layer time out callback
450 * @cmd: timed out SCSI command
452 * Handles SCSI layer timeout. We race with normal completion of
453 * the qc for @cmd. If the qc is already gone, we lose and let
454 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
455 * timed out and EH should be invoked. Prevent ata_qc_complete()
456 * from finishing it by setting EH_SCHEDULED and return
459 * TODO: kill this function once old EH is gone.
462 * Called from timer context
465 * EH_HANDLED or EH_NOT_HANDLED
467 enum blk_eh_timer_return
ata_scsi_timed_out(struct scsi_cmnd
*cmd
)
469 struct Scsi_Host
*host
= cmd
->device
->host
;
470 struct ata_port
*ap
= ata_shost_to_port(host
);
472 struct ata_queued_cmd
*qc
;
473 enum blk_eh_timer_return ret
;
477 if (ap
->ops
->error_handler
) {
478 ret
= BLK_EH_NOT_HANDLED
;
482 ret
= BLK_EH_HANDLED
;
483 spin_lock_irqsave(ap
->lock
, flags
);
484 qc
= ata_qc_from_tag(ap
, ap
->link
.active_tag
);
486 WARN_ON(qc
->scsicmd
!= cmd
);
487 qc
->flags
|= ATA_QCFLAG_EH_SCHEDULED
;
488 qc
->err_mask
|= AC_ERR_TIMEOUT
;
489 ret
= BLK_EH_NOT_HANDLED
;
491 spin_unlock_irqrestore(ap
->lock
, flags
);
494 DPRINTK("EXIT, ret=%d\n", ret
);
498 static void ata_eh_unload(struct ata_port
*ap
)
500 struct ata_link
*link
;
501 struct ata_device
*dev
;
504 /* Restore SControl IPM and SPD for the next driver and
505 * disable attached devices.
507 ata_for_each_link(link
, ap
, PMP_FIRST
) {
508 sata_scr_write(link
, SCR_CONTROL
, link
->saved_scontrol
& 0xff0);
509 ata_for_each_dev(dev
, link
, ALL
)
510 ata_dev_disable(dev
);
513 /* freeze and set UNLOADED */
514 spin_lock_irqsave(ap
->lock
, flags
);
516 ata_port_freeze(ap
); /* won't be thawed */
517 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
; /* clear pending from freeze */
518 ap
->pflags
|= ATA_PFLAG_UNLOADED
;
520 spin_unlock_irqrestore(ap
->lock
, flags
);
524 * ata_scsi_error - SCSI layer error handler callback
525 * @host: SCSI host on which error occurred
527 * Handles SCSI-layer-thrown error events.
530 * Inherited from SCSI layer (none, can sleep)
535 void ata_scsi_error(struct Scsi_Host
*host
)
537 struct ata_port
*ap
= ata_shost_to_port(host
);
543 /* synchronize with port task */
544 ata_port_flush_task(ap
);
546 /* synchronize with host lock and sort out timeouts */
548 /* For new EH, all qcs are finished in one of three ways -
549 * normal completion, error completion, and SCSI timeout.
550 * Both cmpletions can race against SCSI timeout. When normal
551 * completion wins, the qc never reaches EH. When error
552 * completion wins, the qc has ATA_QCFLAG_FAILED set.
554 * When SCSI timeout wins, things are a bit more complex.
555 * Normal or error completion can occur after the timeout but
556 * before this point. In such cases, both types of
557 * completions are honored. A scmd is determined to have
558 * timed out iff its associated qc is active and not failed.
560 if (ap
->ops
->error_handler
) {
561 struct scsi_cmnd
*scmd
, *tmp
;
564 spin_lock_irqsave(ap
->lock
, flags
);
566 list_for_each_entry_safe(scmd
, tmp
, &host
->eh_cmd_q
, eh_entry
) {
567 struct ata_queued_cmd
*qc
;
569 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
570 qc
= __ata_qc_from_tag(ap
, i
);
571 if (qc
->flags
& ATA_QCFLAG_ACTIVE
&&
576 if (i
< ATA_MAX_QUEUE
) {
577 /* the scmd has an associated qc */
578 if (!(qc
->flags
& ATA_QCFLAG_FAILED
)) {
579 /* which hasn't failed yet, timeout */
580 qc
->err_mask
|= AC_ERR_TIMEOUT
;
581 qc
->flags
|= ATA_QCFLAG_FAILED
;
585 /* Normal completion occurred after
586 * SCSI timeout but before this point.
587 * Successfully complete it.
589 scmd
->retries
= scmd
->allowed
;
590 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
594 /* If we have timed out qcs. They belong to EH from
595 * this point but the state of the controller is
596 * unknown. Freeze the port to make sure the IRQ
597 * handler doesn't diddle with those qcs. This must
598 * be done atomically w.r.t. setting QCFLAG_FAILED.
601 __ata_port_freeze(ap
);
603 spin_unlock_irqrestore(ap
->lock
, flags
);
605 /* initialize eh_tries */
606 ap
->eh_tries
= ATA_EH_MAX_TRIES
;
608 spin_unlock_wait(ap
->lock
);
611 /* invoke error handler */
612 if (ap
->ops
->error_handler
) {
613 struct ata_link
*link
;
615 /* kill fast drain timer */
616 del_timer_sync(&ap
->fastdrain_timer
);
618 /* process port resume request */
619 ata_eh_handle_port_resume(ap
);
621 /* fetch & clear EH info */
622 spin_lock_irqsave(ap
->lock
, flags
);
624 ata_for_each_link(link
, ap
, HOST_FIRST
) {
625 struct ata_eh_context
*ehc
= &link
->eh_context
;
626 struct ata_device
*dev
;
628 memset(&link
->eh_context
, 0, sizeof(link
->eh_context
));
629 link
->eh_context
.i
= link
->eh_info
;
630 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
632 ata_for_each_dev(dev
, link
, ENABLED
) {
633 int devno
= dev
->devno
;
635 ehc
->saved_xfer_mode
[devno
] = dev
->xfer_mode
;
636 if (ata_ncq_enabled(dev
))
637 ehc
->saved_ncq_enabled
|= 1 << devno
;
641 ap
->pflags
|= ATA_PFLAG_EH_IN_PROGRESS
;
642 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
643 ap
->excl_link
= NULL
; /* don't maintain exclusion over EH */
645 spin_unlock_irqrestore(ap
->lock
, flags
);
647 /* invoke EH, skip if unloading or suspended */
648 if (!(ap
->pflags
& (ATA_PFLAG_UNLOADING
| ATA_PFLAG_SUSPENDED
)))
649 ap
->ops
->error_handler(ap
);
651 /* if unloading, commence suicide */
652 if ((ap
->pflags
& ATA_PFLAG_UNLOADING
) &&
653 !(ap
->pflags
& ATA_PFLAG_UNLOADED
))
658 /* process port suspend request */
659 ata_eh_handle_port_suspend(ap
);
661 /* Exception might have happend after ->error_handler
662 * recovered the port but before this point. Repeat
665 spin_lock_irqsave(ap
->lock
, flags
);
667 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
) {
668 if (--ap
->eh_tries
) {
669 spin_unlock_irqrestore(ap
->lock
, flags
);
672 ata_port_printk(ap
, KERN_ERR
, "EH pending after %d "
673 "tries, giving up\n", ATA_EH_MAX_TRIES
);
674 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
677 /* this run is complete, make sure EH info is clear */
678 ata_for_each_link(link
, ap
, HOST_FIRST
)
679 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
681 /* Clear host_eh_scheduled while holding ap->lock such
682 * that if exception occurs after this point but
683 * before EH completion, SCSI midlayer will
686 host
->host_eh_scheduled
= 0;
688 spin_unlock_irqrestore(ap
->lock
, flags
);
690 WARN_ON(ata_qc_from_tag(ap
, ap
->link
.active_tag
) == NULL
);
691 ap
->ops
->eng_timeout(ap
);
694 /* finish or retry handled scmd's and clean up */
695 WARN_ON(host
->host_failed
|| !list_empty(&host
->eh_cmd_q
));
697 scsi_eh_flush_done_q(&ap
->eh_done_q
);
700 spin_lock_irqsave(ap
->lock
, flags
);
702 if (ap
->pflags
& ATA_PFLAG_LOADING
)
703 ap
->pflags
&= ~ATA_PFLAG_LOADING
;
704 else if (ap
->pflags
& ATA_PFLAG_SCSI_HOTPLUG
)
705 queue_delayed_work(ata_aux_wq
, &ap
->hotplug_task
, 0);
707 if (ap
->pflags
& ATA_PFLAG_RECOVERED
)
708 ata_port_printk(ap
, KERN_INFO
, "EH complete\n");
710 ap
->pflags
&= ~(ATA_PFLAG_SCSI_HOTPLUG
| ATA_PFLAG_RECOVERED
);
712 /* tell wait_eh that we're done */
713 ap
->pflags
&= ~ATA_PFLAG_EH_IN_PROGRESS
;
714 wake_up_all(&ap
->eh_wait_q
);
716 spin_unlock_irqrestore(ap
->lock
, flags
);
722 * ata_port_wait_eh - Wait for the currently pending EH to complete
723 * @ap: Port to wait EH for
725 * Wait until the currently pending EH is complete.
728 * Kernel thread context (may sleep).
730 void ata_port_wait_eh(struct ata_port
*ap
)
736 spin_lock_irqsave(ap
->lock
, flags
);
738 while (ap
->pflags
& (ATA_PFLAG_EH_PENDING
| ATA_PFLAG_EH_IN_PROGRESS
)) {
739 prepare_to_wait(&ap
->eh_wait_q
, &wait
, TASK_UNINTERRUPTIBLE
);
740 spin_unlock_irqrestore(ap
->lock
, flags
);
742 spin_lock_irqsave(ap
->lock
, flags
);
744 finish_wait(&ap
->eh_wait_q
, &wait
);
746 spin_unlock_irqrestore(ap
->lock
, flags
);
748 /* make sure SCSI EH is complete */
749 if (scsi_host_in_recovery(ap
->scsi_host
)) {
755 static int ata_eh_nr_in_flight(struct ata_port
*ap
)
760 /* count only non-internal commands */
761 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++)
762 if (ata_qc_from_tag(ap
, tag
))
768 void ata_eh_fastdrain_timerfn(unsigned long arg
)
770 struct ata_port
*ap
= (void *)arg
;
774 spin_lock_irqsave(ap
->lock
, flags
);
776 cnt
= ata_eh_nr_in_flight(ap
);
782 if (cnt
== ap
->fastdrain_cnt
) {
785 /* No progress during the last interval, tag all
786 * in-flight qcs as timed out and freeze the port.
788 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++) {
789 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
791 qc
->err_mask
|= AC_ERR_TIMEOUT
;
796 /* some qcs have finished, give it another chance */
797 ap
->fastdrain_cnt
= cnt
;
798 ap
->fastdrain_timer
.expires
=
799 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
800 add_timer(&ap
->fastdrain_timer
);
804 spin_unlock_irqrestore(ap
->lock
, flags
);
808 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
809 * @ap: target ATA port
810 * @fastdrain: activate fast drain
812 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
813 * is non-zero and EH wasn't pending before. Fast drain ensures
814 * that EH kicks in in timely manner.
817 * spin_lock_irqsave(host lock)
819 static void ata_eh_set_pending(struct ata_port
*ap
, int fastdrain
)
823 /* already scheduled? */
824 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
)
827 ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
832 /* do we have in-flight qcs? */
833 cnt
= ata_eh_nr_in_flight(ap
);
837 /* activate fast drain */
838 ap
->fastdrain_cnt
= cnt
;
839 ap
->fastdrain_timer
.expires
=
840 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
841 add_timer(&ap
->fastdrain_timer
);
845 * ata_qc_schedule_eh - schedule qc for error handling
846 * @qc: command to schedule error handling for
848 * Schedule error handling for @qc. EH will kick in as soon as
849 * other commands are drained.
852 * spin_lock_irqsave(host lock)
854 void ata_qc_schedule_eh(struct ata_queued_cmd
*qc
)
856 struct ata_port
*ap
= qc
->ap
;
858 WARN_ON(!ap
->ops
->error_handler
);
860 qc
->flags
|= ATA_QCFLAG_FAILED
;
861 ata_eh_set_pending(ap
, 1);
863 /* The following will fail if timeout has already expired.
864 * ata_scsi_error() takes care of such scmds on EH entry.
865 * Note that ATA_QCFLAG_FAILED is unconditionally set after
866 * this function completes.
868 blk_abort_request(qc
->scsicmd
->request
);
872 * ata_port_schedule_eh - schedule error handling without a qc
873 * @ap: ATA port to schedule EH for
875 * Schedule error handling for @ap. EH will kick in as soon as
876 * all commands are drained.
879 * spin_lock_irqsave(host lock)
881 void ata_port_schedule_eh(struct ata_port
*ap
)
883 WARN_ON(!ap
->ops
->error_handler
);
885 if (ap
->pflags
& ATA_PFLAG_INITIALIZING
)
888 ata_eh_set_pending(ap
, 1);
889 scsi_schedule_eh(ap
->scsi_host
);
891 DPRINTK("port EH scheduled\n");
894 static int ata_do_link_abort(struct ata_port
*ap
, struct ata_link
*link
)
896 int tag
, nr_aborted
= 0;
898 WARN_ON(!ap
->ops
->error_handler
);
900 /* we're gonna abort all commands, no need for fast drain */
901 ata_eh_set_pending(ap
, 0);
903 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
904 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
906 if (qc
&& (!link
|| qc
->dev
->link
== link
)) {
907 qc
->flags
|= ATA_QCFLAG_FAILED
;
914 ata_port_schedule_eh(ap
);
920 * ata_link_abort - abort all qc's on the link
921 * @link: ATA link to abort qc's for
923 * Abort all active qc's active on @link and schedule EH.
926 * spin_lock_irqsave(host lock)
929 * Number of aborted qc's.
931 int ata_link_abort(struct ata_link
*link
)
933 return ata_do_link_abort(link
->ap
, link
);
937 * ata_port_abort - abort all qc's on the port
938 * @ap: ATA port to abort qc's for
940 * Abort all active qc's of @ap and schedule EH.
943 * spin_lock_irqsave(host_set lock)
946 * Number of aborted qc's.
948 int ata_port_abort(struct ata_port
*ap
)
950 return ata_do_link_abort(ap
, NULL
);
954 * __ata_port_freeze - freeze port
955 * @ap: ATA port to freeze
957 * This function is called when HSM violation or some other
958 * condition disrupts normal operation of the port. Frozen port
959 * is not allowed to perform any operation until the port is
960 * thawed, which usually follows a successful reset.
962 * ap->ops->freeze() callback can be used for freezing the port
963 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
964 * port cannot be frozen hardware-wise, the interrupt handler
965 * must ack and clear interrupts unconditionally while the port
969 * spin_lock_irqsave(host lock)
971 static void __ata_port_freeze(struct ata_port
*ap
)
973 WARN_ON(!ap
->ops
->error_handler
);
978 ap
->pflags
|= ATA_PFLAG_FROZEN
;
980 DPRINTK("ata%u port frozen\n", ap
->print_id
);
984 * ata_port_freeze - abort & freeze port
985 * @ap: ATA port to freeze
987 * Abort and freeze @ap.
990 * spin_lock_irqsave(host lock)
993 * Number of aborted commands.
995 int ata_port_freeze(struct ata_port
*ap
)
999 WARN_ON(!ap
->ops
->error_handler
);
1001 nr_aborted
= ata_port_abort(ap
);
1002 __ata_port_freeze(ap
);
1008 * sata_async_notification - SATA async notification handler
1009 * @ap: ATA port where async notification is received
1011 * Handler to be called when async notification via SDB FIS is
1012 * received. This function schedules EH if necessary.
1015 * spin_lock_irqsave(host lock)
1018 * 1 if EH is scheduled, 0 otherwise.
1020 int sata_async_notification(struct ata_port
*ap
)
1025 if (!(ap
->flags
& ATA_FLAG_AN
))
1028 rc
= sata_scr_read(&ap
->link
, SCR_NOTIFICATION
, &sntf
);
1030 sata_scr_write(&ap
->link
, SCR_NOTIFICATION
, sntf
);
1032 if (!sata_pmp_attached(ap
) || rc
) {
1033 /* PMP is not attached or SNTF is not available */
1034 if (!sata_pmp_attached(ap
)) {
1035 /* PMP is not attached. Check whether ATAPI
1036 * AN is configured. If so, notify media
1039 struct ata_device
*dev
= ap
->link
.device
;
1041 if ((dev
->class == ATA_DEV_ATAPI
) &&
1042 (dev
->flags
& ATA_DFLAG_AN
))
1043 ata_scsi_media_change_notify(dev
);
1046 /* PMP is attached but SNTF is not available.
1047 * ATAPI async media change notification is
1048 * not used. The PMP must be reporting PHY
1049 * status change, schedule EH.
1051 ata_port_schedule_eh(ap
);
1055 /* PMP is attached and SNTF is available */
1056 struct ata_link
*link
;
1058 /* check and notify ATAPI AN */
1059 ata_for_each_link(link
, ap
, EDGE
) {
1060 if (!(sntf
& (1 << link
->pmp
)))
1063 if ((link
->device
->class == ATA_DEV_ATAPI
) &&
1064 (link
->device
->flags
& ATA_DFLAG_AN
))
1065 ata_scsi_media_change_notify(link
->device
);
1068 /* If PMP is reporting that PHY status of some
1069 * downstream ports has changed, schedule EH.
1071 if (sntf
& (1 << SATA_PMP_CTRL_PORT
)) {
1072 ata_port_schedule_eh(ap
);
1081 * ata_eh_freeze_port - EH helper to freeze port
1082 * @ap: ATA port to freeze
1089 void ata_eh_freeze_port(struct ata_port
*ap
)
1091 unsigned long flags
;
1093 if (!ap
->ops
->error_handler
)
1096 spin_lock_irqsave(ap
->lock
, flags
);
1097 __ata_port_freeze(ap
);
1098 spin_unlock_irqrestore(ap
->lock
, flags
);
1102 * ata_port_thaw_port - EH helper to thaw port
1103 * @ap: ATA port to thaw
1105 * Thaw frozen port @ap.
1110 void ata_eh_thaw_port(struct ata_port
*ap
)
1112 unsigned long flags
;
1114 if (!ap
->ops
->error_handler
)
1117 spin_lock_irqsave(ap
->lock
, flags
);
1119 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
1124 spin_unlock_irqrestore(ap
->lock
, flags
);
1126 DPRINTK("ata%u port thawed\n", ap
->print_id
);
1129 static void ata_eh_scsidone(struct scsi_cmnd
*scmd
)
1134 static void __ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1136 struct ata_port
*ap
= qc
->ap
;
1137 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1138 unsigned long flags
;
1140 spin_lock_irqsave(ap
->lock
, flags
);
1141 qc
->scsidone
= ata_eh_scsidone
;
1142 __ata_qc_complete(qc
);
1143 WARN_ON(ata_tag_valid(qc
->tag
));
1144 spin_unlock_irqrestore(ap
->lock
, flags
);
1146 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
1150 * ata_eh_qc_complete - Complete an active ATA command from EH
1151 * @qc: Command to complete
1153 * Indicate to the mid and upper layers that an ATA command has
1154 * completed. To be used from EH.
1156 void ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1158 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1159 scmd
->retries
= scmd
->allowed
;
1160 __ata_eh_qc_complete(qc
);
1164 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1165 * @qc: Command to retry
1167 * Indicate to the mid and upper layers that an ATA command
1168 * should be retried. To be used from EH.
1170 * SCSI midlayer limits the number of retries to scmd->allowed.
1171 * scmd->retries is decremented for commands which get retried
1172 * due to unrelated failures (qc->err_mask is zero).
1174 void ata_eh_qc_retry(struct ata_queued_cmd
*qc
)
1176 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1177 if (!qc
->err_mask
&& scmd
->retries
)
1179 __ata_eh_qc_complete(qc
);
1183 * ata_dev_disable - disable ATA device
1184 * @dev: ATA device to disable
1191 void ata_dev_disable(struct ata_device
*dev
)
1193 if (!ata_dev_enabled(dev
))
1196 if (ata_msg_drv(dev
->link
->ap
))
1197 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
1198 ata_acpi_on_disable(dev
);
1199 ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO0
| ATA_DNXFER_QUIET
);
1202 /* From now till the next successful probe, ering is used to
1203 * track probe failures. Clear accumulated device error info.
1205 ata_ering_clear(&dev
->ering
);
1209 * ata_eh_detach_dev - detach ATA device
1210 * @dev: ATA device to detach
1217 void ata_eh_detach_dev(struct ata_device
*dev
)
1219 struct ata_link
*link
= dev
->link
;
1220 struct ata_port
*ap
= link
->ap
;
1221 struct ata_eh_context
*ehc
= &link
->eh_context
;
1222 unsigned long flags
;
1224 ata_dev_disable(dev
);
1226 spin_lock_irqsave(ap
->lock
, flags
);
1228 dev
->flags
&= ~ATA_DFLAG_DETACH
;
1230 if (ata_scsi_offline_dev(dev
)) {
1231 dev
->flags
|= ATA_DFLAG_DETACHED
;
1232 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
1235 /* clear per-dev EH info */
1236 ata_eh_clear_action(link
, dev
, &link
->eh_info
, ATA_EH_PERDEV_MASK
);
1237 ata_eh_clear_action(link
, dev
, &link
->eh_context
.i
, ATA_EH_PERDEV_MASK
);
1238 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
1239 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
1241 spin_unlock_irqrestore(ap
->lock
, flags
);
1245 * ata_eh_about_to_do - about to perform eh_action
1246 * @link: target ATA link
1247 * @dev: target ATA dev for per-dev action (can be NULL)
1248 * @action: action about to be performed
1250 * Called just before performing EH actions to clear related bits
1251 * in @link->eh_info such that eh actions are not unnecessarily
1257 void ata_eh_about_to_do(struct ata_link
*link
, struct ata_device
*dev
,
1258 unsigned int action
)
1260 struct ata_port
*ap
= link
->ap
;
1261 struct ata_eh_info
*ehi
= &link
->eh_info
;
1262 struct ata_eh_context
*ehc
= &link
->eh_context
;
1263 unsigned long flags
;
1265 spin_lock_irqsave(ap
->lock
, flags
);
1267 ata_eh_clear_action(link
, dev
, ehi
, action
);
1269 /* About to take EH action, set RECOVERED. Ignore actions on
1270 * slave links as master will do them again.
1272 if (!(ehc
->i
.flags
& ATA_EHI_QUIET
) && link
!= ap
->slave_link
)
1273 ap
->pflags
|= ATA_PFLAG_RECOVERED
;
1275 spin_unlock_irqrestore(ap
->lock
, flags
);
1279 * ata_eh_done - EH action complete
1280 * @ap: target ATA port
1281 * @dev: target ATA dev for per-dev action (can be NULL)
1282 * @action: action just completed
1284 * Called right after performing EH actions to clear related bits
1285 * in @link->eh_context.
1290 void ata_eh_done(struct ata_link
*link
, struct ata_device
*dev
,
1291 unsigned int action
)
1293 struct ata_eh_context
*ehc
= &link
->eh_context
;
1295 ata_eh_clear_action(link
, dev
, &ehc
->i
, action
);
1299 * ata_err_string - convert err_mask to descriptive string
1300 * @err_mask: error mask to convert to string
1302 * Convert @err_mask to descriptive string. Errors are
1303 * prioritized according to severity and only the most severe
1304 * error is reported.
1310 * Descriptive string for @err_mask
1312 static const char *ata_err_string(unsigned int err_mask
)
1314 if (err_mask
& AC_ERR_HOST_BUS
)
1315 return "host bus error";
1316 if (err_mask
& AC_ERR_ATA_BUS
)
1317 return "ATA bus error";
1318 if (err_mask
& AC_ERR_TIMEOUT
)
1320 if (err_mask
& AC_ERR_HSM
)
1321 return "HSM violation";
1322 if (err_mask
& AC_ERR_SYSTEM
)
1323 return "internal error";
1324 if (err_mask
& AC_ERR_MEDIA
)
1325 return "media error";
1326 if (err_mask
& AC_ERR_INVALID
)
1327 return "invalid argument";
1328 if (err_mask
& AC_ERR_DEV
)
1329 return "device error";
1330 return "unknown error";
1334 * ata_read_log_page - read a specific log page
1335 * @dev: target device
1336 * @page: page to read
1337 * @buf: buffer to store read page
1338 * @sectors: number of sectors to read
1340 * Read log page using READ_LOG_EXT command.
1343 * Kernel thread context (may sleep).
1346 * 0 on success, AC_ERR_* mask otherwise.
1348 static unsigned int ata_read_log_page(struct ata_device
*dev
,
1349 u8 page
, void *buf
, unsigned int sectors
)
1351 struct ata_taskfile tf
;
1352 unsigned int err_mask
;
1354 DPRINTK("read log page - page %d\n", page
);
1356 ata_tf_init(dev
, &tf
);
1357 tf
.command
= ATA_CMD_READ_LOG_EXT
;
1360 tf
.hob_nsect
= sectors
>> 8;
1361 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA48
| ATA_TFLAG_DEVICE
;
1362 tf
.protocol
= ATA_PROT_PIO
;
1364 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1365 buf
, sectors
* ATA_SECT_SIZE
, 0);
1367 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
1372 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1373 * @dev: Device to read log page 10h from
1374 * @tag: Resulting tag of the failed command
1375 * @tf: Resulting taskfile registers of the failed command
1377 * Read log page 10h to obtain NCQ error details and clear error
1381 * Kernel thread context (may sleep).
1384 * 0 on success, -errno otherwise.
1386 static int ata_eh_read_log_10h(struct ata_device
*dev
,
1387 int *tag
, struct ata_taskfile
*tf
)
1389 u8
*buf
= dev
->link
->ap
->sector_buf
;
1390 unsigned int err_mask
;
1394 err_mask
= ata_read_log_page(dev
, ATA_LOG_SATA_NCQ
, buf
, 1);
1399 for (i
= 0; i
< ATA_SECT_SIZE
; i
++)
1402 ata_dev_printk(dev
, KERN_WARNING
,
1403 "invalid checksum 0x%x on log page 10h\n", csum
);
1408 *tag
= buf
[0] & 0x1f;
1410 tf
->command
= buf
[2];
1411 tf
->feature
= buf
[3];
1415 tf
->device
= buf
[7];
1416 tf
->hob_lbal
= buf
[8];
1417 tf
->hob_lbam
= buf
[9];
1418 tf
->hob_lbah
= buf
[10];
1419 tf
->nsect
= buf
[12];
1420 tf
->hob_nsect
= buf
[13];
1426 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1427 * @dev: target ATAPI device
1428 * @r_sense_key: out parameter for sense_key
1430 * Perform ATAPI TEST_UNIT_READY.
1433 * EH context (may sleep).
1436 * 0 on success, AC_ERR_* mask on failure.
1438 static unsigned int atapi_eh_tur(struct ata_device
*dev
, u8
*r_sense_key
)
1440 u8 cdb
[ATAPI_CDB_LEN
] = { TEST_UNIT_READY
, 0, 0, 0, 0, 0 };
1441 struct ata_taskfile tf
;
1442 unsigned int err_mask
;
1444 ata_tf_init(dev
, &tf
);
1446 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1447 tf
.command
= ATA_CMD_PACKET
;
1448 tf
.protocol
= ATAPI_PROT_NODATA
;
1450 err_mask
= ata_exec_internal(dev
, &tf
, cdb
, DMA_NONE
, NULL
, 0, 0);
1451 if (err_mask
== AC_ERR_DEV
)
1452 *r_sense_key
= tf
.feature
>> 4;
1457 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1458 * @dev: device to perform REQUEST_SENSE to
1459 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1460 * @dfl_sense_key: default sense key to use
1462 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1463 * SENSE. This function is EH helper.
1466 * Kernel thread context (may sleep).
1469 * 0 on success, AC_ERR_* mask on failure
1471 static unsigned int atapi_eh_request_sense(struct ata_device
*dev
,
1472 u8
*sense_buf
, u8 dfl_sense_key
)
1474 u8 cdb
[ATAPI_CDB_LEN
] =
1475 { REQUEST_SENSE
, 0, 0, 0, SCSI_SENSE_BUFFERSIZE
, 0 };
1476 struct ata_port
*ap
= dev
->link
->ap
;
1477 struct ata_taskfile tf
;
1479 DPRINTK("ATAPI request sense\n");
1481 /* FIXME: is this needed? */
1482 memset(sense_buf
, 0, SCSI_SENSE_BUFFERSIZE
);
1484 /* initialize sense_buf with the error register,
1485 * for the case where they are -not- overwritten
1487 sense_buf
[0] = 0x70;
1488 sense_buf
[2] = dfl_sense_key
;
1490 /* some devices time out if garbage left in tf */
1491 ata_tf_init(dev
, &tf
);
1493 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1494 tf
.command
= ATA_CMD_PACKET
;
1496 /* is it pointless to prefer PIO for "safety reasons"? */
1497 if (ap
->flags
& ATA_FLAG_PIO_DMA
) {
1498 tf
.protocol
= ATAPI_PROT_DMA
;
1499 tf
.feature
|= ATAPI_PKT_DMA
;
1501 tf
.protocol
= ATAPI_PROT_PIO
;
1502 tf
.lbam
= SCSI_SENSE_BUFFERSIZE
;
1506 return ata_exec_internal(dev
, &tf
, cdb
, DMA_FROM_DEVICE
,
1507 sense_buf
, SCSI_SENSE_BUFFERSIZE
, 0);
1511 * ata_eh_analyze_serror - analyze SError for a failed port
1512 * @link: ATA link to analyze SError for
1514 * Analyze SError if available and further determine cause of
1520 static void ata_eh_analyze_serror(struct ata_link
*link
)
1522 struct ata_eh_context
*ehc
= &link
->eh_context
;
1523 u32 serror
= ehc
->i
.serror
;
1524 unsigned int err_mask
= 0, action
= 0;
1527 if (serror
& (SERR_PERSISTENT
| SERR_DATA
)) {
1528 err_mask
|= AC_ERR_ATA_BUS
;
1529 action
|= ATA_EH_RESET
;
1531 if (serror
& SERR_PROTOCOL
) {
1532 err_mask
|= AC_ERR_HSM
;
1533 action
|= ATA_EH_RESET
;
1535 if (serror
& SERR_INTERNAL
) {
1536 err_mask
|= AC_ERR_SYSTEM
;
1537 action
|= ATA_EH_RESET
;
1540 /* Determine whether a hotplug event has occurred. Both
1541 * SError.N/X are considered hotplug events for enabled or
1542 * host links. For disabled PMP links, only N bit is
1543 * considered as X bit is left at 1 for link plugging.
1547 if (!(link
->flags
& ATA_LFLAG_DISABLED
) || ata_is_host_link(link
))
1548 hotplug_mask
= SERR_PHYRDY_CHG
| SERR_DEV_XCHG
;
1550 hotplug_mask
= SERR_PHYRDY_CHG
;
1552 if (serror
& hotplug_mask
)
1553 ata_ehi_hotplugged(&ehc
->i
);
1555 ehc
->i
.err_mask
|= err_mask
;
1556 ehc
->i
.action
|= action
;
1560 * ata_eh_analyze_ncq_error - analyze NCQ error
1561 * @link: ATA link to analyze NCQ error for
1563 * Read log page 10h, determine the offending qc and acquire
1564 * error status TF. For NCQ device errors, all LLDDs have to do
1565 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1569 * Kernel thread context (may sleep).
1571 void ata_eh_analyze_ncq_error(struct ata_link
*link
)
1573 struct ata_port
*ap
= link
->ap
;
1574 struct ata_eh_context
*ehc
= &link
->eh_context
;
1575 struct ata_device
*dev
= link
->device
;
1576 struct ata_queued_cmd
*qc
;
1577 struct ata_taskfile tf
;
1580 /* if frozen, we can't do much */
1581 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1584 /* is it NCQ device error? */
1585 if (!link
->sactive
|| !(ehc
->i
.err_mask
& AC_ERR_DEV
))
1588 /* has LLDD analyzed already? */
1589 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1590 qc
= __ata_qc_from_tag(ap
, tag
);
1592 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1599 /* okay, this error is ours */
1600 rc
= ata_eh_read_log_10h(dev
, &tag
, &tf
);
1602 ata_link_printk(link
, KERN_ERR
, "failed to read log page 10h "
1603 "(errno=%d)\n", rc
);
1607 if (!(link
->sactive
& (1 << tag
))) {
1608 ata_link_printk(link
, KERN_ERR
, "log page 10h reported "
1609 "inactive tag %d\n", tag
);
1613 /* we've got the perpetrator, condemn it */
1614 qc
= __ata_qc_from_tag(ap
, tag
);
1615 memcpy(&qc
->result_tf
, &tf
, sizeof(tf
));
1616 qc
->result_tf
.flags
= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA
| ATA_TFLAG_LBA48
;
1617 qc
->err_mask
|= AC_ERR_DEV
| AC_ERR_NCQ
;
1618 ehc
->i
.err_mask
&= ~AC_ERR_DEV
;
1622 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1623 * @qc: qc to analyze
1624 * @tf: Taskfile registers to analyze
1626 * Analyze taskfile of @qc and further determine cause of
1627 * failure. This function also requests ATAPI sense data if
1631 * Kernel thread context (may sleep).
1634 * Determined recovery action
1636 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd
*qc
,
1637 const struct ata_taskfile
*tf
)
1639 unsigned int tmp
, action
= 0;
1640 u8 stat
= tf
->command
, err
= tf
->feature
;
1642 if ((stat
& (ATA_BUSY
| ATA_DRQ
| ATA_DRDY
)) != ATA_DRDY
) {
1643 qc
->err_mask
|= AC_ERR_HSM
;
1644 return ATA_EH_RESET
;
1647 if (stat
& (ATA_ERR
| ATA_DF
))
1648 qc
->err_mask
|= AC_ERR_DEV
;
1652 switch (qc
->dev
->class) {
1655 qc
->err_mask
|= AC_ERR_ATA_BUS
;
1657 qc
->err_mask
|= AC_ERR_MEDIA
;
1659 qc
->err_mask
|= AC_ERR_INVALID
;
1663 if (!(qc
->ap
->pflags
& ATA_PFLAG_FROZEN
)) {
1664 tmp
= atapi_eh_request_sense(qc
->dev
,
1665 qc
->scsicmd
->sense_buffer
,
1666 qc
->result_tf
.feature
>> 4);
1668 /* ATA_QCFLAG_SENSE_VALID is used to
1669 * tell atapi_qc_complete() that sense
1670 * data is already valid.
1672 * TODO: interpret sense data and set
1673 * appropriate err_mask.
1675 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1677 qc
->err_mask
|= tmp
;
1681 if (qc
->err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
| AC_ERR_ATA_BUS
))
1682 action
|= ATA_EH_RESET
;
1687 static int ata_eh_categorize_error(unsigned int eflags
, unsigned int err_mask
,
1692 if (!(eflags
& ATA_EFLAG_DUBIOUS_XFER
))
1696 base
= ATA_ECAT_DUBIOUS_NONE
;
1698 if (err_mask
& AC_ERR_ATA_BUS
)
1699 return base
+ ATA_ECAT_ATA_BUS
;
1701 if (err_mask
& AC_ERR_TIMEOUT
)
1702 return base
+ ATA_ECAT_TOUT_HSM
;
1704 if (eflags
& ATA_EFLAG_IS_IO
) {
1705 if (err_mask
& AC_ERR_HSM
)
1706 return base
+ ATA_ECAT_TOUT_HSM
;
1708 (AC_ERR_DEV
|AC_ERR_MEDIA
|AC_ERR_INVALID
)) == AC_ERR_DEV
)
1709 return base
+ ATA_ECAT_UNK_DEV
;
1715 struct speed_down_verdict_arg
{
1718 int nr_errors
[ATA_ECAT_NR
];
1721 static int speed_down_verdict_cb(struct ata_ering_entry
*ent
, void *void_arg
)
1723 struct speed_down_verdict_arg
*arg
= void_arg
;
1726 if (ent
->timestamp
< arg
->since
)
1729 cat
= ata_eh_categorize_error(ent
->eflags
, ent
->err_mask
,
1731 arg
->nr_errors
[cat
]++;
1737 * ata_eh_speed_down_verdict - Determine speed down verdict
1738 * @dev: Device of interest
1740 * This function examines error ring of @dev and determines
1741 * whether NCQ needs to be turned off, transfer speed should be
1742 * stepped down, or falling back to PIO is necessary.
1744 * ECAT_ATA_BUS : ATA_BUS error for any command
1746 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1749 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1751 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1752 * data transfer hasn't been verified.
1756 * NCQ_OFF : Turn off NCQ.
1758 * SPEED_DOWN : Speed down transfer speed but don't fall back
1761 * FALLBACK_TO_PIO : Fall back to PIO.
1763 * Even if multiple verdicts are returned, only one action is
1764 * taken per error. An action triggered by non-DUBIOUS errors
1765 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1766 * This is to expedite speed down decisions right after device is
1767 * initially configured.
1769 * The followings are speed down rules. #1 and #2 deal with
1772 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1773 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1775 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1776 * occurred during last 5 mins, NCQ_OFF.
1778 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1779 * ocurred during last 5 mins, FALLBACK_TO_PIO
1781 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1782 * during last 10 mins, NCQ_OFF.
1784 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1785 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1788 * Inherited from caller.
1791 * OR of ATA_EH_SPDN_* flags.
1793 static unsigned int ata_eh_speed_down_verdict(struct ata_device
*dev
)
1795 const u64 j5mins
= 5LLU * 60 * HZ
, j10mins
= 10LLU * 60 * HZ
;
1796 u64 j64
= get_jiffies_64();
1797 struct speed_down_verdict_arg arg
;
1798 unsigned int verdict
= 0;
1800 /* scan past 5 mins of error history */
1801 memset(&arg
, 0, sizeof(arg
));
1802 arg
.since
= j64
- min(j64
, j5mins
);
1803 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1805 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_ATA_BUS
] +
1806 arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] > 1)
1807 verdict
|= ATA_EH_SPDN_SPEED_DOWN
|
1808 ATA_EH_SPDN_FALLBACK_TO_PIO
| ATA_EH_SPDN_KEEP_ERRORS
;
1810 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] +
1811 arg
.nr_errors
[ATA_ECAT_DUBIOUS_UNK_DEV
] > 1)
1812 verdict
|= ATA_EH_SPDN_NCQ_OFF
| ATA_EH_SPDN_KEEP_ERRORS
;
1814 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1815 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1816 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1817 verdict
|= ATA_EH_SPDN_FALLBACK_TO_PIO
;
1819 /* scan past 10 mins of error history */
1820 memset(&arg
, 0, sizeof(arg
));
1821 arg
.since
= j64
- min(j64
, j10mins
);
1822 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1824 if (arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1825 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 3)
1826 verdict
|= ATA_EH_SPDN_NCQ_OFF
;
1828 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1829 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] > 3 ||
1830 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1831 verdict
|= ATA_EH_SPDN_SPEED_DOWN
;
1837 * ata_eh_speed_down - record error and speed down if necessary
1838 * @dev: Failed device
1839 * @eflags: mask of ATA_EFLAG_* flags
1840 * @err_mask: err_mask of the error
1842 * Record error and examine error history to determine whether
1843 * adjusting transmission speed is necessary. It also sets
1844 * transmission limits appropriately if such adjustment is
1848 * Kernel thread context (may sleep).
1851 * Determined recovery action.
1853 static unsigned int ata_eh_speed_down(struct ata_device
*dev
,
1854 unsigned int eflags
, unsigned int err_mask
)
1856 struct ata_link
*link
= ata_dev_phys_link(dev
);
1858 unsigned int verdict
;
1859 unsigned int action
= 0;
1861 /* don't bother if Cat-0 error */
1862 if (ata_eh_categorize_error(eflags
, err_mask
, &xfer_ok
) == 0)
1865 /* record error and determine whether speed down is necessary */
1866 ata_ering_record(&dev
->ering
, eflags
, err_mask
);
1867 verdict
= ata_eh_speed_down_verdict(dev
);
1870 if ((verdict
& ATA_EH_SPDN_NCQ_OFF
) &&
1871 (dev
->flags
& (ATA_DFLAG_PIO
| ATA_DFLAG_NCQ
|
1872 ATA_DFLAG_NCQ_OFF
)) == ATA_DFLAG_NCQ
) {
1873 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
1874 ata_dev_printk(dev
, KERN_WARNING
,
1875 "NCQ disabled due to excessive errors\n");
1880 if (verdict
& ATA_EH_SPDN_SPEED_DOWN
) {
1881 /* speed down SATA link speed if possible */
1882 if (sata_down_spd_limit(link
, 0) == 0) {
1883 action
|= ATA_EH_RESET
;
1887 /* lower transfer mode */
1888 if (dev
->spdn_cnt
< 2) {
1889 static const int dma_dnxfer_sel
[] =
1890 { ATA_DNXFER_DMA
, ATA_DNXFER_40C
};
1891 static const int pio_dnxfer_sel
[] =
1892 { ATA_DNXFER_PIO
, ATA_DNXFER_FORCE_PIO0
};
1895 if (dev
->xfer_shift
!= ATA_SHIFT_PIO
)
1896 sel
= dma_dnxfer_sel
[dev
->spdn_cnt
];
1898 sel
= pio_dnxfer_sel
[dev
->spdn_cnt
];
1902 if (ata_down_xfermask_limit(dev
, sel
) == 0) {
1903 action
|= ATA_EH_RESET
;
1909 /* Fall back to PIO? Slowing down to PIO is meaningless for
1910 * SATA ATA devices. Consider it only for PATA and SATAPI.
1912 if ((verdict
& ATA_EH_SPDN_FALLBACK_TO_PIO
) && (dev
->spdn_cnt
>= 2) &&
1913 (link
->ap
->cbl
!= ATA_CBL_SATA
|| dev
->class == ATA_DEV_ATAPI
) &&
1914 (dev
->xfer_shift
!= ATA_SHIFT_PIO
)) {
1915 if (ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO
) == 0) {
1917 action
|= ATA_EH_RESET
;
1924 /* device has been slowed down, blow error history */
1925 if (!(verdict
& ATA_EH_SPDN_KEEP_ERRORS
))
1926 ata_ering_clear(&dev
->ering
);
1931 * ata_eh_link_autopsy - analyze error and determine recovery action
1932 * @link: host link to perform autopsy on
1934 * Analyze why @link failed and determine which recovery actions
1935 * are needed. This function also sets more detailed AC_ERR_*
1936 * values and fills sense data for ATAPI CHECK SENSE.
1939 * Kernel thread context (may sleep).
1941 static void ata_eh_link_autopsy(struct ata_link
*link
)
1943 struct ata_port
*ap
= link
->ap
;
1944 struct ata_eh_context
*ehc
= &link
->eh_context
;
1945 struct ata_device
*dev
;
1946 unsigned int all_err_mask
= 0, eflags
= 0;
1953 if (ehc
->i
.flags
& ATA_EHI_NO_AUTOPSY
)
1956 /* obtain and analyze SError */
1957 rc
= sata_scr_read(link
, SCR_ERROR
, &serror
);
1959 ehc
->i
.serror
|= serror
;
1960 ata_eh_analyze_serror(link
);
1961 } else if (rc
!= -EOPNOTSUPP
) {
1962 /* SError read failed, force reset and probing */
1963 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
1964 ehc
->i
.action
|= ATA_EH_RESET
;
1965 ehc
->i
.err_mask
|= AC_ERR_OTHER
;
1968 /* analyze NCQ failure */
1969 ata_eh_analyze_ncq_error(link
);
1971 /* any real error trumps AC_ERR_OTHER */
1972 if (ehc
->i
.err_mask
& ~AC_ERR_OTHER
)
1973 ehc
->i
.err_mask
&= ~AC_ERR_OTHER
;
1975 all_err_mask
|= ehc
->i
.err_mask
;
1977 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1978 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
1980 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
1981 ata_dev_phys_link(qc
->dev
) != link
)
1984 /* inherit upper level err_mask */
1985 qc
->err_mask
|= ehc
->i
.err_mask
;
1988 ehc
->i
.action
|= ata_eh_analyze_tf(qc
, &qc
->result_tf
);
1990 /* DEV errors are probably spurious in case of ATA_BUS error */
1991 if (qc
->err_mask
& AC_ERR_ATA_BUS
)
1992 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_MEDIA
|
1995 /* any real error trumps unknown error */
1996 if (qc
->err_mask
& ~AC_ERR_OTHER
)
1997 qc
->err_mask
&= ~AC_ERR_OTHER
;
1999 /* SENSE_VALID trumps dev/unknown error and revalidation */
2000 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
2001 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_OTHER
);
2003 /* determine whether the command is worth retrying */
2004 if (!(qc
->err_mask
& AC_ERR_INVALID
) &&
2005 ((qc
->flags
& ATA_QCFLAG_IO
) || qc
->err_mask
!= AC_ERR_DEV
))
2006 qc
->flags
|= ATA_QCFLAG_RETRY
;
2008 /* accumulate error info */
2009 ehc
->i
.dev
= qc
->dev
;
2010 all_err_mask
|= qc
->err_mask
;
2011 if (qc
->flags
& ATA_QCFLAG_IO
)
2012 eflags
|= ATA_EFLAG_IS_IO
;
2015 /* enforce default EH actions */
2016 if (ap
->pflags
& ATA_PFLAG_FROZEN
||
2017 all_err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
))
2018 ehc
->i
.action
|= ATA_EH_RESET
;
2019 else if (((eflags
& ATA_EFLAG_IS_IO
) && all_err_mask
) ||
2020 (!(eflags
& ATA_EFLAG_IS_IO
) && (all_err_mask
& ~AC_ERR_DEV
)))
2021 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2023 /* If we have offending qcs and the associated failed device,
2024 * perform per-dev EH action only on the offending device.
2027 ehc
->i
.dev_action
[ehc
->i
.dev
->devno
] |=
2028 ehc
->i
.action
& ATA_EH_PERDEV_MASK
;
2029 ehc
->i
.action
&= ~ATA_EH_PERDEV_MASK
;
2032 /* propagate timeout to host link */
2033 if ((all_err_mask
& AC_ERR_TIMEOUT
) && !ata_is_host_link(link
))
2034 ap
->link
.eh_context
.i
.err_mask
|= AC_ERR_TIMEOUT
;
2036 /* record error and consider speeding down */
2038 if (!dev
&& ((ata_link_max_devices(link
) == 1 &&
2039 ata_dev_enabled(link
->device
))))
2043 if (dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)
2044 eflags
|= ATA_EFLAG_DUBIOUS_XFER
;
2045 ehc
->i
.action
|= ata_eh_speed_down(dev
, eflags
, all_err_mask
);
2052 * ata_eh_autopsy - analyze error and determine recovery action
2053 * @ap: host port to perform autopsy on
2055 * Analyze all links of @ap and determine why they failed and
2056 * which recovery actions are needed.
2059 * Kernel thread context (may sleep).
2061 void ata_eh_autopsy(struct ata_port
*ap
)
2063 struct ata_link
*link
;
2065 ata_for_each_link(link
, ap
, EDGE
)
2066 ata_eh_link_autopsy(link
);
2068 /* Handle the frigging slave link. Autopsy is done similarly
2069 * but actions and flags are transferred over to the master
2070 * link and handled from there.
2072 if (ap
->slave_link
) {
2073 struct ata_eh_context
*mehc
= &ap
->link
.eh_context
;
2074 struct ata_eh_context
*sehc
= &ap
->slave_link
->eh_context
;
2076 /* transfer control flags from master to slave */
2077 sehc
->i
.flags
|= mehc
->i
.flags
& ATA_EHI_TO_SLAVE_MASK
;
2079 /* perform autopsy on the slave link */
2080 ata_eh_link_autopsy(ap
->slave_link
);
2082 /* transfer actions from slave to master and clear slave */
2083 ata_eh_about_to_do(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2084 mehc
->i
.action
|= sehc
->i
.action
;
2085 mehc
->i
.dev_action
[1] |= sehc
->i
.dev_action
[1];
2086 mehc
->i
.flags
|= sehc
->i
.flags
;
2087 ata_eh_done(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2090 /* Autopsy of fanout ports can affect host link autopsy.
2091 * Perform host link autopsy last.
2093 if (sata_pmp_attached(ap
))
2094 ata_eh_link_autopsy(&ap
->link
);
2098 * ata_eh_link_report - report error handling to user
2099 * @link: ATA link EH is going on
2101 * Report EH to user.
2106 static void ata_eh_link_report(struct ata_link
*link
)
2108 struct ata_port
*ap
= link
->ap
;
2109 struct ata_eh_context
*ehc
= &link
->eh_context
;
2110 const char *frozen
, *desc
;
2112 int tag
, nr_failed
= 0;
2114 if (ehc
->i
.flags
& ATA_EHI_QUIET
)
2118 if (ehc
->i
.desc
[0] != '\0')
2121 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2122 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2124 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2125 ata_dev_phys_link(qc
->dev
) != link
||
2126 ((qc
->flags
& ATA_QCFLAG_QUIET
) &&
2127 qc
->err_mask
== AC_ERR_DEV
))
2129 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
&& !qc
->err_mask
)
2135 if (!nr_failed
&& !ehc
->i
.err_mask
)
2139 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2142 memset(tries_buf
, 0, sizeof(tries_buf
));
2143 if (ap
->eh_tries
< ATA_EH_MAX_TRIES
)
2144 snprintf(tries_buf
, sizeof(tries_buf
) - 1, " t%d",
2148 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "exception Emask 0x%x "
2149 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2150 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2151 ehc
->i
.action
, frozen
, tries_buf
);
2153 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "%s\n", desc
);
2155 ata_link_printk(link
, KERN_ERR
, "exception Emask 0x%x "
2156 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2157 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2158 ehc
->i
.action
, frozen
, tries_buf
);
2160 ata_link_printk(link
, KERN_ERR
, "%s\n", desc
);
2164 ata_link_printk(link
, KERN_ERR
,
2165 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2166 ehc
->i
.serror
& SERR_DATA_RECOVERED
? "RecovData " : "",
2167 ehc
->i
.serror
& SERR_COMM_RECOVERED
? "RecovComm " : "",
2168 ehc
->i
.serror
& SERR_DATA
? "UnrecovData " : "",
2169 ehc
->i
.serror
& SERR_PERSISTENT
? "Persist " : "",
2170 ehc
->i
.serror
& SERR_PROTOCOL
? "Proto " : "",
2171 ehc
->i
.serror
& SERR_INTERNAL
? "HostInt " : "",
2172 ehc
->i
.serror
& SERR_PHYRDY_CHG
? "PHYRdyChg " : "",
2173 ehc
->i
.serror
& SERR_PHY_INT_ERR
? "PHYInt " : "",
2174 ehc
->i
.serror
& SERR_COMM_WAKE
? "CommWake " : "",
2175 ehc
->i
.serror
& SERR_10B_8B_ERR
? "10B8B " : "",
2176 ehc
->i
.serror
& SERR_DISPARITY
? "Dispar " : "",
2177 ehc
->i
.serror
& SERR_CRC
? "BadCRC " : "",
2178 ehc
->i
.serror
& SERR_HANDSHAKE
? "Handshk " : "",
2179 ehc
->i
.serror
& SERR_LINK_SEQ_ERR
? "LinkSeq " : "",
2180 ehc
->i
.serror
& SERR_TRANS_ST_ERROR
? "TrStaTrns " : "",
2181 ehc
->i
.serror
& SERR_UNRECOG_FIS
? "UnrecFIS " : "",
2182 ehc
->i
.serror
& SERR_DEV_XCHG
? "DevExch " : "");
2184 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2185 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2186 struct ata_taskfile
*cmd
= &qc
->tf
, *res
= &qc
->result_tf
;
2187 const u8
*cdb
= qc
->cdb
;
2188 char data_buf
[20] = "";
2189 char cdb_buf
[70] = "";
2191 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2192 ata_dev_phys_link(qc
->dev
) != link
|| !qc
->err_mask
)
2195 if (qc
->dma_dir
!= DMA_NONE
) {
2196 static const char *dma_str
[] = {
2197 [DMA_BIDIRECTIONAL
] = "bidi",
2198 [DMA_TO_DEVICE
] = "out",
2199 [DMA_FROM_DEVICE
] = "in",
2201 static const char *prot_str
[] = {
2202 [ATA_PROT_PIO
] = "pio",
2203 [ATA_PROT_DMA
] = "dma",
2204 [ATA_PROT_NCQ
] = "ncq",
2205 [ATAPI_PROT_PIO
] = "pio",
2206 [ATAPI_PROT_DMA
] = "dma",
2209 snprintf(data_buf
, sizeof(data_buf
), " %s %u %s",
2210 prot_str
[qc
->tf
.protocol
], qc
->nbytes
,
2211 dma_str
[qc
->dma_dir
]);
2214 if (ata_is_atapi(qc
->tf
.protocol
))
2215 snprintf(cdb_buf
, sizeof(cdb_buf
),
2216 "cdb %02x %02x %02x %02x %02x %02x %02x %02x "
2217 "%02x %02x %02x %02x %02x %02x %02x %02x\n ",
2218 cdb
[0], cdb
[1], cdb
[2], cdb
[3],
2219 cdb
[4], cdb
[5], cdb
[6], cdb
[7],
2220 cdb
[8], cdb
[9], cdb
[10], cdb
[11],
2221 cdb
[12], cdb
[13], cdb
[14], cdb
[15]);
2223 ata_dev_printk(qc
->dev
, KERN_ERR
,
2224 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2226 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2227 "Emask 0x%x (%s)%s\n",
2228 cmd
->command
, cmd
->feature
, cmd
->nsect
,
2229 cmd
->lbal
, cmd
->lbam
, cmd
->lbah
,
2230 cmd
->hob_feature
, cmd
->hob_nsect
,
2231 cmd
->hob_lbal
, cmd
->hob_lbam
, cmd
->hob_lbah
,
2232 cmd
->device
, qc
->tag
, data_buf
, cdb_buf
,
2233 res
->command
, res
->feature
, res
->nsect
,
2234 res
->lbal
, res
->lbam
, res
->lbah
,
2235 res
->hob_feature
, res
->hob_nsect
,
2236 res
->hob_lbal
, res
->hob_lbam
, res
->hob_lbah
,
2237 res
->device
, qc
->err_mask
, ata_err_string(qc
->err_mask
),
2238 qc
->err_mask
& AC_ERR_NCQ
? " <F>" : "");
2240 if (res
->command
& (ATA_BUSY
| ATA_DRDY
| ATA_DF
| ATA_DRQ
|
2242 if (res
->command
& ATA_BUSY
)
2243 ata_dev_printk(qc
->dev
, KERN_ERR
,
2244 "status: { Busy }\n");
2246 ata_dev_printk(qc
->dev
, KERN_ERR
,
2247 "status: { %s%s%s%s}\n",
2248 res
->command
& ATA_DRDY
? "DRDY " : "",
2249 res
->command
& ATA_DF
? "DF " : "",
2250 res
->command
& ATA_DRQ
? "DRQ " : "",
2251 res
->command
& ATA_ERR
? "ERR " : "");
2254 if (cmd
->command
!= ATA_CMD_PACKET
&&
2255 (res
->feature
& (ATA_ICRC
| ATA_UNC
| ATA_IDNF
|
2257 ata_dev_printk(qc
->dev
, KERN_ERR
,
2258 "error: { %s%s%s%s}\n",
2259 res
->feature
& ATA_ICRC
? "ICRC " : "",
2260 res
->feature
& ATA_UNC
? "UNC " : "",
2261 res
->feature
& ATA_IDNF
? "IDNF " : "",
2262 res
->feature
& ATA_ABORTED
? "ABRT " : "");
2267 * ata_eh_report - report error handling to user
2268 * @ap: ATA port to report EH about
2270 * Report EH to user.
2275 void ata_eh_report(struct ata_port
*ap
)
2277 struct ata_link
*link
;
2279 ata_for_each_link(link
, ap
, HOST_FIRST
)
2280 ata_eh_link_report(link
);
2283 static int ata_do_reset(struct ata_link
*link
, ata_reset_fn_t reset
,
2284 unsigned int *classes
, unsigned long deadline
,
2287 struct ata_device
*dev
;
2290 ata_for_each_dev(dev
, link
, ALL
)
2291 classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
2293 return reset(link
, classes
, deadline
);
2296 static int ata_eh_followup_srst_needed(struct ata_link
*link
,
2297 int rc
, const unsigned int *classes
)
2299 if ((link
->flags
& ATA_LFLAG_NO_SRST
) || ata_link_offline(link
))
2303 if (sata_pmp_supported(link
->ap
) && ata_is_host_link(link
))
2308 int ata_eh_reset(struct ata_link
*link
, int classify
,
2309 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
2310 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
2312 struct ata_port
*ap
= link
->ap
;
2313 struct ata_link
*slave
= ap
->slave_link
;
2314 struct ata_eh_context
*ehc
= &link
->eh_context
;
2315 struct ata_eh_context
*sehc
= &slave
->eh_context
;
2316 unsigned int *classes
= ehc
->classes
;
2317 unsigned int lflags
= link
->flags
;
2318 int verbose
= !(ehc
->i
.flags
& ATA_EHI_QUIET
);
2319 int max_tries
= 0, try = 0;
2320 struct ata_link
*failed_link
;
2321 struct ata_device
*dev
;
2322 unsigned long deadline
, now
;
2323 ata_reset_fn_t reset
;
2324 unsigned long flags
;
2331 while (ata_eh_reset_timeouts
[max_tries
] != ULONG_MAX
)
2333 if (link
->flags
& ATA_LFLAG_NO_HRST
)
2335 if (link
->flags
& ATA_LFLAG_NO_SRST
)
2338 /* make sure each reset attemp is at least COOL_DOWN apart */
2339 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
2341 WARN_ON(time_after(ehc
->last_reset
, now
));
2342 deadline
= ata_deadline(ehc
->last_reset
,
2343 ATA_EH_RESET_COOL_DOWN
);
2344 if (time_before(now
, deadline
))
2345 schedule_timeout_uninterruptible(deadline
- now
);
2348 spin_lock_irqsave(ap
->lock
, flags
);
2349 ap
->pflags
|= ATA_PFLAG_RESETTING
;
2350 spin_unlock_irqrestore(ap
->lock
, flags
);
2352 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2354 ata_for_each_dev(dev
, link
, ALL
) {
2355 /* If we issue an SRST then an ATA drive (not ATAPI)
2356 * may change configuration and be in PIO0 timing. If
2357 * we do a hard reset (or are coming from power on)
2358 * this is true for ATA or ATAPI. Until we've set a
2359 * suitable controller mode we should not touch the
2360 * bus as we may be talking too fast.
2362 dev
->pio_mode
= XFER_PIO_0
;
2364 /* If the controller has a pio mode setup function
2365 * then use it to set the chipset to rights. Don't
2366 * touch the DMA setup as that will be dealt with when
2367 * configuring devices.
2369 if (ap
->ops
->set_piomode
)
2370 ap
->ops
->set_piomode(ap
, dev
);
2373 /* prefer hardreset */
2375 ehc
->i
.action
&= ~ATA_EH_RESET
;
2378 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2379 } else if (softreset
) {
2381 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2385 unsigned long deadline
= ata_deadline(jiffies
,
2386 ATA_EH_PRERESET_TIMEOUT
);
2389 sehc
->i
.action
&= ~ATA_EH_RESET
;
2390 sehc
->i
.action
|= ehc
->i
.action
;
2393 rc
= prereset(link
, deadline
);
2395 /* If present, do prereset on slave link too. Reset
2396 * is skipped iff both master and slave links report
2397 * -ENOENT or clear ATA_EH_RESET.
2399 if (slave
&& (rc
== 0 || rc
== -ENOENT
)) {
2402 tmp
= prereset(slave
, deadline
);
2406 ehc
->i
.action
|= sehc
->i
.action
;
2410 if (rc
== -ENOENT
) {
2411 ata_link_printk(link
, KERN_DEBUG
,
2412 "port disabled. ignoring.\n");
2413 ehc
->i
.action
&= ~ATA_EH_RESET
;
2415 ata_for_each_dev(dev
, link
, ALL
)
2416 classes
[dev
->devno
] = ATA_DEV_NONE
;
2420 ata_link_printk(link
, KERN_ERR
,
2421 "prereset failed (errno=%d)\n", rc
);
2425 /* prereset() might have cleared ATA_EH_RESET. If so,
2426 * bang classes and return.
2428 if (reset
&& !(ehc
->i
.action
& ATA_EH_RESET
)) {
2429 ata_for_each_dev(dev
, link
, ALL
)
2430 classes
[dev
->devno
] = ATA_DEV_NONE
;
2440 if (ata_is_host_link(link
))
2441 ata_eh_freeze_port(ap
);
2443 deadline
= ata_deadline(jiffies
, ata_eh_reset_timeouts
[try++]);
2447 ata_link_printk(link
, KERN_INFO
, "%s resetting link\n",
2448 reset
== softreset
? "soft" : "hard");
2450 /* mark that this EH session started with reset */
2451 ehc
->last_reset
= jiffies
;
2452 if (reset
== hardreset
)
2453 ehc
->i
.flags
|= ATA_EHI_DID_HARDRESET
;
2455 ehc
->i
.flags
|= ATA_EHI_DID_SOFTRESET
;
2457 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2458 if (rc
&& rc
!= -EAGAIN
) {
2463 /* hardreset slave link if existent */
2464 if (slave
&& reset
== hardreset
) {
2468 ata_link_printk(slave
, KERN_INFO
,
2469 "hard resetting link\n");
2471 ata_eh_about_to_do(slave
, NULL
, ATA_EH_RESET
);
2472 tmp
= ata_do_reset(slave
, reset
, classes
, deadline
,
2480 failed_link
= slave
;
2486 /* perform follow-up SRST if necessary */
2487 if (reset
== hardreset
&&
2488 ata_eh_followup_srst_needed(link
, rc
, classes
)) {
2492 ata_link_printk(link
, KERN_ERR
,
2493 "follow-up softreset required "
2494 "but no softreset avaliable\n");
2500 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2501 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2505 ata_link_printk(link
, KERN_INFO
, "no reset method "
2506 "available, skipping reset\n");
2507 if (!(lflags
& ATA_LFLAG_ASSUME_CLASS
))
2508 lflags
|= ATA_LFLAG_ASSUME_ATA
;
2512 * Post-reset processing
2514 ata_for_each_dev(dev
, link
, ALL
) {
2515 /* After the reset, the device state is PIO 0 and the
2516 * controller state is undefined. Reset also wakes up
2517 * drives from sleeping mode.
2519 dev
->pio_mode
= XFER_PIO_0
;
2520 dev
->flags
&= ~ATA_DFLAG_SLEEPING
;
2522 if (!ata_phys_link_offline(ata_dev_phys_link(dev
))) {
2523 /* apply class override */
2524 if (lflags
& ATA_LFLAG_ASSUME_ATA
)
2525 classes
[dev
->devno
] = ATA_DEV_ATA
;
2526 else if (lflags
& ATA_LFLAG_ASSUME_SEMB
)
2527 classes
[dev
->devno
] = ATA_DEV_SEMB_UNSUP
;
2529 classes
[dev
->devno
] = ATA_DEV_NONE
;
2532 /* record current link speed */
2533 if (sata_scr_read(link
, SCR_STATUS
, &sstatus
) == 0)
2534 link
->sata_spd
= (sstatus
>> 4) & 0xf;
2535 if (slave
&& sata_scr_read(slave
, SCR_STATUS
, &sstatus
) == 0)
2536 slave
->sata_spd
= (sstatus
>> 4) & 0xf;
2539 if (ata_is_host_link(link
))
2540 ata_eh_thaw_port(ap
);
2542 /* postreset() should clear hardware SError. Although SError
2543 * is cleared during link resume, clearing SError here is
2544 * necessary as some PHYs raise hotplug events after SRST.
2545 * This introduces race condition where hotplug occurs between
2546 * reset and here. This race is mediated by cross checking
2547 * link onlineness and classification result later.
2550 postreset(link
, classes
);
2552 postreset(slave
, classes
);
2555 /* clear cached SError */
2556 spin_lock_irqsave(link
->ap
->lock
, flags
);
2557 link
->eh_info
.serror
= 0;
2559 slave
->eh_info
.serror
= 0;
2560 spin_unlock_irqrestore(link
->ap
->lock
, flags
);
2562 /* Make sure onlineness and classification result correspond.
2563 * Hotplug could have happened during reset and some
2564 * controllers fail to wait while a drive is spinning up after
2565 * being hotplugged causing misdetection. By cross checking
2566 * link onlineness and classification result, those conditions
2567 * can be reliably detected and retried.
2570 ata_for_each_dev(dev
, link
, ALL
) {
2571 /* convert all ATA_DEV_UNKNOWN to ATA_DEV_NONE */
2572 if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
2573 classes
[dev
->devno
] = ATA_DEV_NONE
;
2574 if (ata_phys_link_online(ata_dev_phys_link(dev
)))
2579 if (classify
&& nr_unknown
) {
2580 if (try < max_tries
) {
2581 ata_link_printk(link
, KERN_WARNING
, "link online but "
2582 "device misclassified, retrying\n");
2587 ata_link_printk(link
, KERN_WARNING
,
2588 "link online but device misclassified, "
2589 "device detection might fail\n");
2592 /* reset successful, schedule revalidation */
2593 ata_eh_done(link
, NULL
, ATA_EH_RESET
);
2595 ata_eh_done(slave
, NULL
, ATA_EH_RESET
);
2596 ehc
->last_reset
= jiffies
; /* update to completion time */
2597 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2601 /* clear hotplug flag */
2602 ehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2604 sehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2606 spin_lock_irqsave(ap
->lock
, flags
);
2607 ap
->pflags
&= ~ATA_PFLAG_RESETTING
;
2608 spin_unlock_irqrestore(ap
->lock
, flags
);
2613 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2614 if (!ata_is_host_link(link
) &&
2615 sata_scr_read(link
, SCR_STATUS
, &sstatus
))
2618 if (rc
== -ERESTART
|| try >= max_tries
)
2622 if (time_before(now
, deadline
)) {
2623 unsigned long delta
= deadline
- now
;
2625 ata_link_printk(failed_link
, KERN_WARNING
,
2626 "reset failed (errno=%d), retrying in %u secs\n",
2627 rc
, DIV_ROUND_UP(jiffies_to_msecs(delta
), 1000));
2630 delta
= schedule_timeout_uninterruptible(delta
);
2633 if (try == max_tries
- 1) {
2634 sata_down_spd_limit(link
, 0);
2636 sata_down_spd_limit(slave
, 0);
2637 } else if (rc
== -EPIPE
)
2638 sata_down_spd_limit(failed_link
, 0);
2645 static inline void ata_eh_pull_park_action(struct ata_port
*ap
)
2647 struct ata_link
*link
;
2648 struct ata_device
*dev
;
2649 unsigned long flags
;
2652 * This function can be thought of as an extended version of
2653 * ata_eh_about_to_do() specially crafted to accommodate the
2654 * requirements of ATA_EH_PARK handling. Since the EH thread
2655 * does not leave the do {} while () loop in ata_eh_recover as
2656 * long as the timeout for a park request to *one* device on
2657 * the port has not expired, and since we still want to pick
2658 * up park requests to other devices on the same port or
2659 * timeout updates for the same device, we have to pull
2660 * ATA_EH_PARK actions from eh_info into eh_context.i
2661 * ourselves at the beginning of each pass over the loop.
2663 * Additionally, all write accesses to &ap->park_req_pending
2664 * through INIT_COMPLETION() (see below) or complete_all()
2665 * (see ata_scsi_park_store()) are protected by the host lock.
2666 * As a result we have that park_req_pending.done is zero on
2667 * exit from this function, i.e. when ATA_EH_PARK actions for
2668 * *all* devices on port ap have been pulled into the
2669 * respective eh_context structs. If, and only if,
2670 * park_req_pending.done is non-zero by the time we reach
2671 * wait_for_completion_timeout(), another ATA_EH_PARK action
2672 * has been scheduled for at least one of the devices on port
2673 * ap and we have to cycle over the do {} while () loop in
2674 * ata_eh_recover() again.
2677 spin_lock_irqsave(ap
->lock
, flags
);
2678 INIT_COMPLETION(ap
->park_req_pending
);
2679 ata_for_each_link(link
, ap
, EDGE
) {
2680 ata_for_each_dev(dev
, link
, ALL
) {
2681 struct ata_eh_info
*ehi
= &link
->eh_info
;
2683 link
->eh_context
.i
.dev_action
[dev
->devno
] |=
2684 ehi
->dev_action
[dev
->devno
] & ATA_EH_PARK
;
2685 ata_eh_clear_action(link
, dev
, ehi
, ATA_EH_PARK
);
2688 spin_unlock_irqrestore(ap
->lock
, flags
);
2691 static void ata_eh_park_issue_cmd(struct ata_device
*dev
, int park
)
2693 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
2694 struct ata_taskfile tf
;
2695 unsigned int err_mask
;
2697 ata_tf_init(dev
, &tf
);
2699 ehc
->unloaded_mask
|= 1 << dev
->devno
;
2700 tf
.command
= ATA_CMD_IDLEIMMEDIATE
;
2706 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
2707 tf
.command
= ATA_CMD_CHK_POWER
;
2710 tf
.flags
|= ATA_TFLAG_DEVICE
| ATA_TFLAG_ISADDR
;
2711 tf
.protocol
|= ATA_PROT_NODATA
;
2712 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
2713 if (park
&& (err_mask
|| tf
.lbal
!= 0xc4)) {
2714 ata_dev_printk(dev
, KERN_ERR
, "head unload failed!\n");
2715 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
2719 static int ata_eh_revalidate_and_attach(struct ata_link
*link
,
2720 struct ata_device
**r_failed_dev
)
2722 struct ata_port
*ap
= link
->ap
;
2723 struct ata_eh_context
*ehc
= &link
->eh_context
;
2724 struct ata_device
*dev
;
2725 unsigned int new_mask
= 0;
2726 unsigned long flags
;
2731 /* For PATA drive side cable detection to work, IDENTIFY must
2732 * be done backwards such that PDIAG- is released by the slave
2733 * device before the master device is identified.
2735 ata_for_each_dev(dev
, link
, ALL_REVERSE
) {
2736 unsigned int action
= ata_eh_dev_action(dev
);
2737 unsigned int readid_flags
= 0;
2739 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
2740 readid_flags
|= ATA_READID_POSTRESET
;
2742 if ((action
& ATA_EH_REVALIDATE
) && ata_dev_enabled(dev
)) {
2743 WARN_ON(dev
->class == ATA_DEV_PMP
);
2745 if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
2750 ata_eh_about_to_do(link
, dev
, ATA_EH_REVALIDATE
);
2751 rc
= ata_dev_revalidate(dev
, ehc
->classes
[dev
->devno
],
2756 ata_eh_done(link
, dev
, ATA_EH_REVALIDATE
);
2758 /* Configuration may have changed, reconfigure
2761 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
2763 /* schedule the scsi_rescan_device() here */
2764 queue_work(ata_aux_wq
, &(ap
->scsi_rescan_task
));
2765 } else if (dev
->class == ATA_DEV_UNKNOWN
&&
2766 ehc
->tries
[dev
->devno
] &&
2767 ata_class_enabled(ehc
->classes
[dev
->devno
])) {
2768 dev
->class = ehc
->classes
[dev
->devno
];
2770 if (dev
->class == ATA_DEV_PMP
)
2771 rc
= sata_pmp_attach(dev
);
2773 rc
= ata_dev_read_id(dev
, &dev
->class,
2774 readid_flags
, dev
->id
);
2777 /* clear error info accumulated during probe */
2778 ata_ering_clear(&dev
->ering
);
2779 new_mask
|= 1 << dev
->devno
;
2782 /* IDENTIFY was issued to non-existent
2783 * device. No need to reset. Just
2784 * thaw and kill the device.
2786 ata_eh_thaw_port(ap
);
2787 dev
->class = ATA_DEV_UNKNOWN
;
2790 dev
->class = ATA_DEV_UNKNOWN
;
2796 /* PDIAG- should have been released, ask cable type if post-reset */
2797 if ((ehc
->i
.flags
& ATA_EHI_DID_RESET
) && ata_is_host_link(link
)) {
2798 if (ap
->ops
->cable_detect
)
2799 ap
->cbl
= ap
->ops
->cable_detect(ap
);
2803 /* Configure new devices forward such that user doesn't see
2804 * device detection messages backwards.
2806 ata_for_each_dev(dev
, link
, ALL
) {
2807 if (!(new_mask
& (1 << dev
->devno
)) ||
2808 dev
->class == ATA_DEV_PMP
)
2811 ehc
->i
.flags
|= ATA_EHI_PRINTINFO
;
2812 rc
= ata_dev_configure(dev
);
2813 ehc
->i
.flags
&= ~ATA_EHI_PRINTINFO
;
2817 spin_lock_irqsave(ap
->lock
, flags
);
2818 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
2819 spin_unlock_irqrestore(ap
->lock
, flags
);
2821 /* new device discovered, configure xfermode */
2822 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
2828 *r_failed_dev
= dev
;
2829 DPRINTK("EXIT rc=%d\n", rc
);
2834 * ata_set_mode - Program timings and issue SET FEATURES - XFER
2835 * @link: link on which timings will be programmed
2836 * @r_failed_dev: out paramter for failed device
2838 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
2839 * ata_set_mode() fails, pointer to the failing device is
2840 * returned in @r_failed_dev.
2843 * PCI/etc. bus probe sem.
2846 * 0 on success, negative errno otherwise
2848 int ata_set_mode(struct ata_link
*link
, struct ata_device
**r_failed_dev
)
2850 struct ata_port
*ap
= link
->ap
;
2851 struct ata_device
*dev
;
2854 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
2855 ata_for_each_dev(dev
, link
, ENABLED
) {
2856 if (!(dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)) {
2857 struct ata_ering_entry
*ent
;
2859 ent
= ata_ering_top(&dev
->ering
);
2861 ent
->eflags
&= ~ATA_EFLAG_DUBIOUS_XFER
;
2865 /* has private set_mode? */
2866 if (ap
->ops
->set_mode
)
2867 rc
= ap
->ops
->set_mode(link
, r_failed_dev
);
2869 rc
= ata_do_set_mode(link
, r_failed_dev
);
2871 /* if transfer mode has changed, set DUBIOUS_XFER on device */
2872 ata_for_each_dev(dev
, link
, ENABLED
) {
2873 struct ata_eh_context
*ehc
= &link
->eh_context
;
2874 u8 saved_xfer_mode
= ehc
->saved_xfer_mode
[dev
->devno
];
2875 u8 saved_ncq
= !!(ehc
->saved_ncq_enabled
& (1 << dev
->devno
));
2877 if (dev
->xfer_mode
!= saved_xfer_mode
||
2878 ata_ncq_enabled(dev
) != saved_ncq
)
2879 dev
->flags
|= ATA_DFLAG_DUBIOUS_XFER
;
2886 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
2887 * @dev: ATAPI device to clear UA for
2889 * Resets and other operations can make an ATAPI device raise
2890 * UNIT ATTENTION which causes the next operation to fail. This
2891 * function clears UA.
2894 * EH context (may sleep).
2897 * 0 on success, -errno on failure.
2899 static int atapi_eh_clear_ua(struct ata_device
*dev
)
2903 for (i
= 0; i
< ATA_EH_UA_TRIES
; i
++) {
2904 u8 sense_buffer
[SCSI_SENSE_BUFFERSIZE
];
2906 unsigned int err_mask
;
2908 err_mask
= atapi_eh_tur(dev
, &sense_key
);
2909 if (err_mask
!= 0 && err_mask
!= AC_ERR_DEV
) {
2910 ata_dev_printk(dev
, KERN_WARNING
, "TEST_UNIT_READY "
2911 "failed (err_mask=0x%x)\n", err_mask
);
2915 if (!err_mask
|| sense_key
!= UNIT_ATTENTION
)
2918 err_mask
= atapi_eh_request_sense(dev
, sense_buffer
, sense_key
);
2920 ata_dev_printk(dev
, KERN_WARNING
, "failed to clear "
2921 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask
);
2926 ata_dev_printk(dev
, KERN_WARNING
,
2927 "UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES
);
2932 static int ata_link_nr_enabled(struct ata_link
*link
)
2934 struct ata_device
*dev
;
2937 ata_for_each_dev(dev
, link
, ENABLED
)
2942 static int ata_link_nr_vacant(struct ata_link
*link
)
2944 struct ata_device
*dev
;
2947 ata_for_each_dev(dev
, link
, ALL
)
2948 if (dev
->class == ATA_DEV_UNKNOWN
)
2953 static int ata_eh_skip_recovery(struct ata_link
*link
)
2955 struct ata_port
*ap
= link
->ap
;
2956 struct ata_eh_context
*ehc
= &link
->eh_context
;
2957 struct ata_device
*dev
;
2959 /* skip disabled links */
2960 if (link
->flags
& ATA_LFLAG_DISABLED
)
2963 /* thaw frozen port and recover failed devices */
2964 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) || ata_link_nr_enabled(link
))
2967 /* reset at least once if reset is requested */
2968 if ((ehc
->i
.action
& ATA_EH_RESET
) &&
2969 !(ehc
->i
.flags
& ATA_EHI_DID_RESET
))
2972 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
2973 ata_for_each_dev(dev
, link
, ALL
) {
2974 if (dev
->class == ATA_DEV_UNKNOWN
&&
2975 ehc
->classes
[dev
->devno
] != ATA_DEV_NONE
)
2982 static int ata_count_probe_trials_cb(struct ata_ering_entry
*ent
, void *void_arg
)
2984 u64 interval
= msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL
);
2985 u64 now
= get_jiffies_64();
2986 int *trials
= void_arg
;
2988 if (ent
->timestamp
< now
- min(now
, interval
))
2995 static int ata_eh_schedule_probe(struct ata_device
*dev
)
2997 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
2998 struct ata_link
*link
= ata_dev_phys_link(dev
);
3001 if (!(ehc
->i
.probe_mask
& (1 << dev
->devno
)) ||
3002 (ehc
->did_probe_mask
& (1 << dev
->devno
)))
3005 ata_eh_detach_dev(dev
);
3007 ehc
->did_probe_mask
|= (1 << dev
->devno
);
3008 ehc
->i
.action
|= ATA_EH_RESET
;
3009 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
3010 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
3012 /* Record and count probe trials on the ering. The specific
3013 * error mask used is irrelevant. Because a successful device
3014 * detection clears the ering, this count accumulates only if
3015 * there are consecutive failed probes.
3017 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3018 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3019 * forced to 1.5Gbps.
3021 * This is to work around cases where failed link speed
3022 * negotiation results in device misdetection leading to
3023 * infinite DEVXCHG or PHRDY CHG events.
3025 ata_ering_record(&dev
->ering
, 0, AC_ERR_OTHER
);
3026 ata_ering_map(&dev
->ering
, ata_count_probe_trials_cb
, &trials
);
3028 if (trials
> ATA_EH_PROBE_TRIALS
)
3029 sata_down_spd_limit(link
, 1);
3034 static int ata_eh_handle_dev_fail(struct ata_device
*dev
, int err
)
3036 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3038 /* -EAGAIN from EH routine indicates retry without prejudice.
3039 * The requester is responsible for ensuring forward progress.
3042 ehc
->tries
[dev
->devno
]--;
3046 /* device missing or wrong IDENTIFY data, schedule probing */
3047 ehc
->i
.probe_mask
|= (1 << dev
->devno
);
3049 /* give it just one more chance */
3050 ehc
->tries
[dev
->devno
] = min(ehc
->tries
[dev
->devno
], 1);
3052 if (ehc
->tries
[dev
->devno
] == 1) {
3053 /* This is the last chance, better to slow
3054 * down than lose it.
3056 sata_down_spd_limit(ata_dev_phys_link(dev
), 0);
3057 if (dev
->pio_mode
> XFER_PIO_0
)
3058 ata_down_xfermask_limit(dev
, ATA_DNXFER_PIO
);
3062 if (ata_dev_enabled(dev
) && !ehc
->tries
[dev
->devno
]) {
3063 /* disable device if it has used up all its chances */
3064 ata_dev_disable(dev
);
3066 /* detach if offline */
3067 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
3068 ata_eh_detach_dev(dev
);
3070 /* schedule probe if necessary */
3071 if (ata_eh_schedule_probe(dev
)) {
3072 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3073 memset(ehc
->cmd_timeout_idx
[dev
->devno
], 0,
3074 sizeof(ehc
->cmd_timeout_idx
[dev
->devno
]));
3079 ehc
->i
.action
|= ATA_EH_RESET
;
3085 * ata_eh_recover - recover host port after error
3086 * @ap: host port to recover
3087 * @prereset: prereset method (can be NULL)
3088 * @softreset: softreset method (can be NULL)
3089 * @hardreset: hardreset method (can be NULL)
3090 * @postreset: postreset method (can be NULL)
3091 * @r_failed_link: out parameter for failed link
3093 * This is the alpha and omega, eum and yang, heart and soul of
3094 * libata exception handling. On entry, actions required to
3095 * recover each link and hotplug requests are recorded in the
3096 * link's eh_context. This function executes all the operations
3097 * with appropriate retrials and fallbacks to resurrect failed
3098 * devices, detach goners and greet newcomers.
3101 * Kernel thread context (may sleep).
3104 * 0 on success, -errno on failure.
3106 int ata_eh_recover(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3107 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3108 ata_postreset_fn_t postreset
,
3109 struct ata_link
**r_failed_link
)
3111 struct ata_link
*link
;
3112 struct ata_device
*dev
;
3115 unsigned long flags
, deadline
;
3119 /* prep for recovery */
3120 ata_for_each_link(link
, ap
, EDGE
) {
3121 struct ata_eh_context
*ehc
= &link
->eh_context
;
3123 /* re-enable link? */
3124 if (ehc
->i
.action
& ATA_EH_ENABLE_LINK
) {
3125 ata_eh_about_to_do(link
, NULL
, ATA_EH_ENABLE_LINK
);
3126 spin_lock_irqsave(ap
->lock
, flags
);
3127 link
->flags
&= ~ATA_LFLAG_DISABLED
;
3128 spin_unlock_irqrestore(ap
->lock
, flags
);
3129 ata_eh_done(link
, NULL
, ATA_EH_ENABLE_LINK
);
3132 ata_for_each_dev(dev
, link
, ALL
) {
3133 if (link
->flags
& ATA_LFLAG_NO_RETRY
)
3134 ehc
->tries
[dev
->devno
] = 1;
3136 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3138 /* collect port action mask recorded in dev actions */
3139 ehc
->i
.action
|= ehc
->i
.dev_action
[dev
->devno
] &
3140 ~ATA_EH_PERDEV_MASK
;
3141 ehc
->i
.dev_action
[dev
->devno
] &= ATA_EH_PERDEV_MASK
;
3143 /* process hotplug request */
3144 if (dev
->flags
& ATA_DFLAG_DETACH
)
3145 ata_eh_detach_dev(dev
);
3147 /* schedule probe if necessary */
3148 if (!ata_dev_enabled(dev
))
3149 ata_eh_schedule_probe(dev
);
3157 /* if UNLOADING, finish immediately */
3158 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
3162 ata_for_each_link(link
, ap
, EDGE
) {
3163 struct ata_eh_context
*ehc
= &link
->eh_context
;
3165 /* skip EH if possible. */
3166 if (ata_eh_skip_recovery(link
))
3169 ata_for_each_dev(dev
, link
, ALL
)
3170 ehc
->classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
3174 ata_for_each_link(link
, ap
, EDGE
) {
3175 struct ata_eh_context
*ehc
= &link
->eh_context
;
3177 if (!(ehc
->i
.action
& ATA_EH_RESET
))
3180 rc
= ata_eh_reset(link
, ata_link_nr_vacant(link
),
3181 prereset
, softreset
, hardreset
, postreset
);
3183 ata_link_printk(link
, KERN_ERR
,
3184 "reset failed, giving up\n");
3193 * clears ATA_EH_PARK in eh_info and resets
3194 * ap->park_req_pending
3196 ata_eh_pull_park_action(ap
);
3199 ata_for_each_link(link
, ap
, EDGE
) {
3200 ata_for_each_dev(dev
, link
, ALL
) {
3201 struct ata_eh_context
*ehc
= &link
->eh_context
;
3204 if (dev
->class != ATA_DEV_ATA
)
3206 if (!(ehc
->i
.dev_action
[dev
->devno
] &
3209 tmp
= dev
->unpark_deadline
;
3210 if (time_before(deadline
, tmp
))
3212 else if (time_before_eq(tmp
, jiffies
))
3214 if (ehc
->unloaded_mask
& (1 << dev
->devno
))
3217 ata_eh_park_issue_cmd(dev
, 1);
3222 if (time_before_eq(deadline
, now
))
3225 deadline
= wait_for_completion_timeout(&ap
->park_req_pending
,
3228 ata_for_each_link(link
, ap
, EDGE
) {
3229 ata_for_each_dev(dev
, link
, ALL
) {
3230 if (!(link
->eh_context
.unloaded_mask
&
3234 ata_eh_park_issue_cmd(dev
, 0);
3235 ata_eh_done(link
, dev
, ATA_EH_PARK
);
3240 ata_for_each_link(link
, ap
, EDGE
) {
3241 struct ata_eh_context
*ehc
= &link
->eh_context
;
3243 /* revalidate existing devices and attach new ones */
3244 rc
= ata_eh_revalidate_and_attach(link
, &dev
);
3248 /* if PMP got attached, return, pmp EH will take care of it */
3249 if (link
->device
->class == ATA_DEV_PMP
) {
3254 /* configure transfer mode if necessary */
3255 if (ehc
->i
.flags
& ATA_EHI_SETMODE
) {
3256 rc
= ata_set_mode(link
, &dev
);
3259 ehc
->i
.flags
&= ~ATA_EHI_SETMODE
;
3262 /* If reset has been issued, clear UA to avoid
3263 * disrupting the current users of the device.
3265 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
3266 ata_for_each_dev(dev
, link
, ALL
) {
3267 if (dev
->class != ATA_DEV_ATAPI
)
3269 rc
= atapi_eh_clear_ua(dev
);
3275 /* configure link power saving */
3276 if (ehc
->i
.action
& ATA_EH_LPM
)
3277 ata_for_each_dev(dev
, link
, ALL
)
3278 ata_dev_enable_pm(dev
, ap
->pm_policy
);
3280 /* this link is okay now */
3286 ata_eh_handle_dev_fail(dev
, rc
);
3288 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
3289 /* PMP reset requires working host port.
3290 * Can't retry if it's frozen.
3292 if (sata_pmp_attached(ap
))
3302 if (rc
&& r_failed_link
)
3303 *r_failed_link
= link
;
3305 DPRINTK("EXIT, rc=%d\n", rc
);
3310 * ata_eh_finish - finish up EH
3311 * @ap: host port to finish EH for
3313 * Recovery is complete. Clean up EH states and retry or finish
3319 void ata_eh_finish(struct ata_port
*ap
)
3323 /* retry or finish qcs */
3324 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
3325 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
3327 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
3331 /* FIXME: Once EH migration is complete,
3332 * generate sense data in this function,
3333 * considering both err_mask and tf.
3335 if (qc
->flags
& ATA_QCFLAG_RETRY
)
3336 ata_eh_qc_retry(qc
);
3338 ata_eh_qc_complete(qc
);
3340 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
3341 ata_eh_qc_complete(qc
);
3343 /* feed zero TF to sense generation */
3344 memset(&qc
->result_tf
, 0, sizeof(qc
->result_tf
));
3345 ata_eh_qc_retry(qc
);
3350 /* make sure nr_active_links is zero after EH */
3351 WARN_ON(ap
->nr_active_links
);
3352 ap
->nr_active_links
= 0;
3356 * ata_do_eh - do standard error handling
3357 * @ap: host port to handle error for
3359 * @prereset: prereset method (can be NULL)
3360 * @softreset: softreset method (can be NULL)
3361 * @hardreset: hardreset method (can be NULL)
3362 * @postreset: postreset method (can be NULL)
3364 * Perform standard error handling sequence.
3367 * Kernel thread context (may sleep).
3369 void ata_do_eh(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3370 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3371 ata_postreset_fn_t postreset
)
3373 struct ata_device
*dev
;
3379 rc
= ata_eh_recover(ap
, prereset
, softreset
, hardreset
, postreset
,
3382 ata_for_each_dev(dev
, &ap
->link
, ALL
)
3383 ata_dev_disable(dev
);
3390 * ata_std_error_handler - standard error handler
3391 * @ap: host port to handle error for
3393 * Standard error handler
3396 * Kernel thread context (may sleep).
3398 void ata_std_error_handler(struct ata_port
*ap
)
3400 struct ata_port_operations
*ops
= ap
->ops
;
3401 ata_reset_fn_t hardreset
= ops
->hardreset
;
3403 /* ignore built-in hardreset if SCR access is not available */
3404 if (ata_is_builtin_hardreset(hardreset
) && !sata_scr_valid(&ap
->link
))
3407 ata_do_eh(ap
, ops
->prereset
, ops
->softreset
, hardreset
, ops
->postreset
);
3412 * ata_eh_handle_port_suspend - perform port suspend operation
3413 * @ap: port to suspend
3418 * Kernel thread context (may sleep).
3420 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
3422 unsigned long flags
;
3425 /* are we suspending? */
3426 spin_lock_irqsave(ap
->lock
, flags
);
3427 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
3428 ap
->pm_mesg
.event
== PM_EVENT_ON
) {
3429 spin_unlock_irqrestore(ap
->lock
, flags
);
3432 spin_unlock_irqrestore(ap
->lock
, flags
);
3434 WARN_ON(ap
->pflags
& ATA_PFLAG_SUSPENDED
);
3436 /* tell ACPI we're suspending */
3437 rc
= ata_acpi_on_suspend(ap
);
3442 ata_eh_freeze_port(ap
);
3444 if (ap
->ops
->port_suspend
)
3445 rc
= ap
->ops
->port_suspend(ap
, ap
->pm_mesg
);
3447 ata_acpi_set_state(ap
, PMSG_SUSPEND
);
3450 spin_lock_irqsave(ap
->lock
, flags
);
3452 ap
->pflags
&= ~ATA_PFLAG_PM_PENDING
;
3454 ap
->pflags
|= ATA_PFLAG_SUSPENDED
;
3455 else if (ap
->pflags
& ATA_PFLAG_FROZEN
)
3456 ata_port_schedule_eh(ap
);
3458 if (ap
->pm_result
) {
3459 *ap
->pm_result
= rc
;
3460 ap
->pm_result
= NULL
;
3463 spin_unlock_irqrestore(ap
->lock
, flags
);
3469 * ata_eh_handle_port_resume - perform port resume operation
3470 * @ap: port to resume
3475 * Kernel thread context (may sleep).
3477 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
3479 unsigned long flags
;
3482 /* are we resuming? */
3483 spin_lock_irqsave(ap
->lock
, flags
);
3484 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
3485 ap
->pm_mesg
.event
!= PM_EVENT_ON
) {
3486 spin_unlock_irqrestore(ap
->lock
, flags
);
3489 spin_unlock_irqrestore(ap
->lock
, flags
);
3491 WARN_ON(!(ap
->pflags
& ATA_PFLAG_SUSPENDED
));
3493 ata_acpi_set_state(ap
, PMSG_ON
);
3495 if (ap
->ops
->port_resume
)
3496 rc
= ap
->ops
->port_resume(ap
);
3498 /* tell ACPI that we're resuming */
3499 ata_acpi_on_resume(ap
);
3502 spin_lock_irqsave(ap
->lock
, flags
);
3503 ap
->pflags
&= ~(ATA_PFLAG_PM_PENDING
| ATA_PFLAG_SUSPENDED
);
3504 if (ap
->pm_result
) {
3505 *ap
->pm_result
= rc
;
3506 ap
->pm_result
= NULL
;
3508 spin_unlock_irqrestore(ap
->lock
, flags
);
3510 #endif /* CONFIG_PM */