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_dbg.h>
44 #include "../scsi/scsi_transport_api.h"
46 #include <linux/libata.h>
51 /* speed down verdicts */
52 ATA_EH_SPDN_NCQ_OFF
= (1 << 0),
53 ATA_EH_SPDN_SPEED_DOWN
= (1 << 1),
54 ATA_EH_SPDN_FALLBACK_TO_PIO
= (1 << 2),
55 ATA_EH_SPDN_KEEP_ERRORS
= (1 << 3),
58 ATA_EFLAG_IS_IO
= (1 << 0),
59 ATA_EFLAG_DUBIOUS_XFER
= (1 << 1),
60 ATA_EFLAG_OLD_ER
= (1 << 31),
62 /* error categories */
65 ATA_ECAT_TOUT_HSM
= 2,
67 ATA_ECAT_DUBIOUS_NONE
= 4,
68 ATA_ECAT_DUBIOUS_ATA_BUS
= 5,
69 ATA_ECAT_DUBIOUS_TOUT_HSM
= 6,
70 ATA_ECAT_DUBIOUS_UNK_DEV
= 7,
73 ATA_EH_CMD_DFL_TIMEOUT
= 5000,
75 /* always put at least this amount of time between resets */
76 ATA_EH_RESET_COOL_DOWN
= 5000,
78 /* Waiting in ->prereset can never be reliable. It's
79 * sometimes nice to wait there but it can't be depended upon;
80 * otherwise, we wouldn't be resetting. Just give it enough
81 * time for most drives to spin up.
83 ATA_EH_PRERESET_TIMEOUT
= 10000,
84 ATA_EH_FASTDRAIN_INTERVAL
= 3000,
88 /* probe speed down parameters, see ata_eh_schedule_probe() */
89 ATA_EH_PROBE_TRIAL_INTERVAL
= 60000, /* 1 min */
90 ATA_EH_PROBE_TRIALS
= 2,
93 /* The following table determines how we sequence resets. Each entry
94 * represents timeout for that try. The first try can be soft or
95 * hardreset. All others are hardreset if available. In most cases
96 * the first reset w/ 10sec timeout should succeed. Following entries
97 * are mostly for error handling, hotplug and retarded devices.
99 static const unsigned long ata_eh_reset_timeouts
[] = {
100 10000, /* most drives spin up by 10sec */
101 10000, /* > 99% working drives spin up before 20sec */
102 35000, /* give > 30 secs of idleness for retarded devices */
103 5000, /* and sweet one last chance */
104 ULONG_MAX
, /* > 1 min has elapsed, give up */
107 static const unsigned long ata_eh_identify_timeouts
[] = {
108 5000, /* covers > 99% of successes and not too boring on failures */
109 10000, /* combined time till here is enough even for media access */
110 30000, /* for true idiots */
114 static const unsigned long ata_eh_flush_timeouts
[] = {
115 15000, /* be generous with flush */
117 30000, /* and even more generous */
121 static const unsigned long ata_eh_other_timeouts
[] = {
122 5000, /* same rationale as identify timeout */
124 /* but no merciful 30sec for other commands, it just isn't worth it */
128 struct ata_eh_cmd_timeout_ent
{
130 const unsigned long *timeouts
;
133 /* The following table determines timeouts to use for EH internal
134 * commands. Each table entry is a command class and matches the
135 * commands the entry applies to and the timeout table to use.
137 * On the retry after a command timed out, the next timeout value from
138 * the table is used. If the table doesn't contain further entries,
139 * the last value is used.
141 * ehc->cmd_timeout_idx keeps track of which timeout to use per
142 * command class, so if SET_FEATURES times out on the first try, the
143 * next try will use the second timeout value only for that class.
145 #define CMDS(cmds...) (const u8 []){ cmds, 0 }
146 static const struct ata_eh_cmd_timeout_ent
147 ata_eh_cmd_timeout_table
[ATA_EH_CMD_TIMEOUT_TABLE_SIZE
] = {
148 { .commands
= CMDS(ATA_CMD_ID_ATA
, ATA_CMD_ID_ATAPI
),
149 .timeouts
= ata_eh_identify_timeouts
, },
150 { .commands
= CMDS(ATA_CMD_READ_NATIVE_MAX
, ATA_CMD_READ_NATIVE_MAX_EXT
),
151 .timeouts
= ata_eh_other_timeouts
, },
152 { .commands
= CMDS(ATA_CMD_SET_MAX
, ATA_CMD_SET_MAX_EXT
),
153 .timeouts
= ata_eh_other_timeouts
, },
154 { .commands
= CMDS(ATA_CMD_SET_FEATURES
),
155 .timeouts
= ata_eh_other_timeouts
, },
156 { .commands
= CMDS(ATA_CMD_INIT_DEV_PARAMS
),
157 .timeouts
= ata_eh_other_timeouts
, },
158 { .commands
= CMDS(ATA_CMD_FLUSH
, ATA_CMD_FLUSH_EXT
),
159 .timeouts
= ata_eh_flush_timeouts
},
163 static void __ata_port_freeze(struct ata_port
*ap
);
165 static void ata_eh_handle_port_suspend(struct ata_port
*ap
);
166 static void ata_eh_handle_port_resume(struct ata_port
*ap
);
167 #else /* CONFIG_PM */
168 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
171 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
173 #endif /* CONFIG_PM */
175 static void __ata_ehi_pushv_desc(struct ata_eh_info
*ehi
, const char *fmt
,
178 ehi
->desc_len
+= vscnprintf(ehi
->desc
+ ehi
->desc_len
,
179 ATA_EH_DESC_LEN
- ehi
->desc_len
,
184 * __ata_ehi_push_desc - push error description without adding separator
186 * @fmt: printf format string
188 * Format string according to @fmt and append it to @ehi->desc.
191 * spin_lock_irqsave(host lock)
193 void __ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
198 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
203 * ata_ehi_push_desc - push error description with separator
205 * @fmt: printf format string
207 * Format string according to @fmt and append it to @ehi->desc.
208 * If @ehi->desc is not empty, ", " is added in-between.
211 * spin_lock_irqsave(host lock)
213 void ata_ehi_push_desc(struct ata_eh_info
*ehi
, const char *fmt
, ...)
218 __ata_ehi_push_desc(ehi
, ", ");
221 __ata_ehi_pushv_desc(ehi
, fmt
, args
);
226 * ata_ehi_clear_desc - clean error description
232 * spin_lock_irqsave(host lock)
234 void ata_ehi_clear_desc(struct ata_eh_info
*ehi
)
241 * ata_port_desc - append port description
242 * @ap: target ATA port
243 * @fmt: printf format string
245 * Format string according to @fmt and append it to port
246 * description. If port description is not empty, " " is added
247 * in-between. This function is to be used while initializing
248 * ata_host. The description is printed on host registration.
253 void ata_port_desc(struct ata_port
*ap
, const char *fmt
, ...)
257 WARN_ON(!(ap
->pflags
& ATA_PFLAG_INITIALIZING
));
259 if (ap
->link
.eh_info
.desc_len
)
260 __ata_ehi_push_desc(&ap
->link
.eh_info
, " ");
263 __ata_ehi_pushv_desc(&ap
->link
.eh_info
, fmt
, args
);
270 * ata_port_pbar_desc - append PCI BAR description
271 * @ap: target ATA port
272 * @bar: target PCI BAR
273 * @offset: offset into PCI BAR
274 * @name: name of the area
276 * If @offset is negative, this function formats a string which
277 * contains the name, address, size and type of the BAR and
278 * appends it to the port description. If @offset is zero or
279 * positive, only name and offsetted address is appended.
284 void ata_port_pbar_desc(struct ata_port
*ap
, int bar
, ssize_t offset
,
287 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
289 unsigned long long start
, len
;
291 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
293 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
296 start
= (unsigned long long)pci_resource_start(pdev
, bar
);
297 len
= (unsigned long long)pci_resource_len(pdev
, bar
);
300 ata_port_desc(ap
, "%s %s%llu@0x%llx", name
, type
, len
, start
);
302 ata_port_desc(ap
, "%s 0x%llx", name
,
303 start
+ (unsigned long long)offset
);
306 #endif /* CONFIG_PCI */
308 static int ata_lookup_timeout_table(u8 cmd
)
312 for (i
= 0; i
< ATA_EH_CMD_TIMEOUT_TABLE_SIZE
; i
++) {
315 for (cur
= ata_eh_cmd_timeout_table
[i
].commands
; *cur
; cur
++)
324 * ata_internal_cmd_timeout - determine timeout for an internal command
325 * @dev: target device
326 * @cmd: internal command to be issued
328 * Determine timeout for internal command @cmd for @dev.
334 * Determined timeout.
336 unsigned long ata_internal_cmd_timeout(struct ata_device
*dev
, u8 cmd
)
338 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
339 int ent
= ata_lookup_timeout_table(cmd
);
343 return ATA_EH_CMD_DFL_TIMEOUT
;
345 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
346 return ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
];
350 * ata_internal_cmd_timed_out - notification for internal command timeout
351 * @dev: target device
352 * @cmd: internal command which timed out
354 * Notify EH that internal command @cmd for @dev timed out. This
355 * function should be called only for commands whose timeouts are
356 * determined using ata_internal_cmd_timeout().
361 void ata_internal_cmd_timed_out(struct ata_device
*dev
, u8 cmd
)
363 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
364 int ent
= ata_lookup_timeout_table(cmd
);
370 idx
= ehc
->cmd_timeout_idx
[dev
->devno
][ent
];
371 if (ata_eh_cmd_timeout_table
[ent
].timeouts
[idx
+ 1] != ULONG_MAX
)
372 ehc
->cmd_timeout_idx
[dev
->devno
][ent
]++;
375 static void ata_ering_record(struct ata_ering
*ering
, unsigned int eflags
,
376 unsigned int err_mask
)
378 struct ata_ering_entry
*ent
;
383 ering
->cursor
%= ATA_ERING_SIZE
;
385 ent
= &ering
->ring
[ering
->cursor
];
386 ent
->eflags
= eflags
;
387 ent
->err_mask
= err_mask
;
388 ent
->timestamp
= get_jiffies_64();
391 static struct ata_ering_entry
*ata_ering_top(struct ata_ering
*ering
)
393 struct ata_ering_entry
*ent
= &ering
->ring
[ering
->cursor
];
400 int ata_ering_map(struct ata_ering
*ering
,
401 int (*map_fn
)(struct ata_ering_entry
*, void *),
405 struct ata_ering_entry
*ent
;
409 ent
= &ering
->ring
[idx
];
412 rc
= map_fn(ent
, arg
);
415 idx
= (idx
- 1 + ATA_ERING_SIZE
) % ATA_ERING_SIZE
;
416 } while (idx
!= ering
->cursor
);
421 int ata_ering_clear_cb(struct ata_ering_entry
*ent
, void *void_arg
)
423 ent
->eflags
|= ATA_EFLAG_OLD_ER
;
427 static void ata_ering_clear(struct ata_ering
*ering
)
429 ata_ering_map(ering
, ata_ering_clear_cb
, NULL
);
432 static unsigned int ata_eh_dev_action(struct ata_device
*dev
)
434 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
436 return ehc
->i
.action
| ehc
->i
.dev_action
[dev
->devno
];
439 static void ata_eh_clear_action(struct ata_link
*link
, struct ata_device
*dev
,
440 struct ata_eh_info
*ehi
, unsigned int action
)
442 struct ata_device
*tdev
;
445 ehi
->action
&= ~action
;
446 ata_for_each_dev(tdev
, link
, ALL
)
447 ehi
->dev_action
[tdev
->devno
] &= ~action
;
449 /* doesn't make sense for port-wide EH actions */
450 WARN_ON(!(action
& ATA_EH_PERDEV_MASK
));
452 /* break ehi->action into ehi->dev_action */
453 if (ehi
->action
& action
) {
454 ata_for_each_dev(tdev
, link
, ALL
)
455 ehi
->dev_action
[tdev
->devno
] |=
456 ehi
->action
& action
;
457 ehi
->action
&= ~action
;
460 /* turn off the specified per-dev action */
461 ehi
->dev_action
[dev
->devno
] &= ~action
;
466 * ata_eh_acquire - acquire EH ownership
467 * @ap: ATA port to acquire EH ownership for
469 * Acquire EH ownership for @ap. This is the basic exclusion
470 * mechanism for ports sharing a host. Only one port hanging off
471 * the same host can claim the ownership of EH.
476 void ata_eh_acquire(struct ata_port
*ap
)
478 mutex_lock(&ap
->host
->eh_mutex
);
479 WARN_ON_ONCE(ap
->host
->eh_owner
);
480 ap
->host
->eh_owner
= current
;
484 * ata_eh_release - release EH ownership
485 * @ap: ATA port to release EH ownership for
487 * Release EH ownership for @ap if the caller. The caller must
488 * have acquired EH ownership using ata_eh_acquire() previously.
493 void ata_eh_release(struct ata_port
*ap
)
495 WARN_ON_ONCE(ap
->host
->eh_owner
!= current
);
496 ap
->host
->eh_owner
= NULL
;
497 mutex_unlock(&ap
->host
->eh_mutex
);
501 * ata_scsi_timed_out - SCSI layer time out callback
502 * @cmd: timed out SCSI command
504 * Handles SCSI layer timeout. We race with normal completion of
505 * the qc for @cmd. If the qc is already gone, we lose and let
506 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
507 * timed out and EH should be invoked. Prevent ata_qc_complete()
508 * from finishing it by setting EH_SCHEDULED and return
511 * TODO: kill this function once old EH is gone.
514 * Called from timer context
517 * EH_HANDLED or EH_NOT_HANDLED
519 enum blk_eh_timer_return
ata_scsi_timed_out(struct scsi_cmnd
*cmd
)
521 struct Scsi_Host
*host
= cmd
->device
->host
;
522 struct ata_port
*ap
= ata_shost_to_port(host
);
524 struct ata_queued_cmd
*qc
;
525 enum blk_eh_timer_return ret
;
529 if (ap
->ops
->error_handler
) {
530 ret
= BLK_EH_NOT_HANDLED
;
534 ret
= BLK_EH_HANDLED
;
535 spin_lock_irqsave(ap
->lock
, flags
);
536 qc
= ata_qc_from_tag(ap
, ap
->link
.active_tag
);
538 WARN_ON(qc
->scsicmd
!= cmd
);
539 qc
->flags
|= ATA_QCFLAG_EH_SCHEDULED
;
540 qc
->err_mask
|= AC_ERR_TIMEOUT
;
541 ret
= BLK_EH_NOT_HANDLED
;
543 spin_unlock_irqrestore(ap
->lock
, flags
);
546 DPRINTK("EXIT, ret=%d\n", ret
);
550 static void ata_eh_unload(struct ata_port
*ap
)
552 struct ata_link
*link
;
553 struct ata_device
*dev
;
556 /* Restore SControl IPM and SPD for the next driver and
557 * disable attached devices.
559 ata_for_each_link(link
, ap
, PMP_FIRST
) {
560 sata_scr_write(link
, SCR_CONTROL
, link
->saved_scontrol
& 0xff0);
561 ata_for_each_dev(dev
, link
, ALL
)
562 ata_dev_disable(dev
);
565 /* freeze and set UNLOADED */
566 spin_lock_irqsave(ap
->lock
, flags
);
568 ata_port_freeze(ap
); /* won't be thawed */
569 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
; /* clear pending from freeze */
570 ap
->pflags
|= ATA_PFLAG_UNLOADED
;
572 spin_unlock_irqrestore(ap
->lock
, flags
);
576 * ata_scsi_error - SCSI layer error handler callback
577 * @host: SCSI host on which error occurred
579 * Handles SCSI-layer-thrown error events.
582 * Inherited from SCSI layer (none, can sleep)
587 void ata_scsi_error(struct Scsi_Host
*host
)
589 struct ata_port
*ap
= ata_shost_to_port(host
);
591 LIST_HEAD(eh_work_q
);
595 spin_lock_irqsave(host
->host_lock
, flags
);
596 list_splice_init(&host
->eh_cmd_q
, &eh_work_q
);
597 spin_unlock_irqrestore(host
->host_lock
, flags
);
599 ata_scsi_cmd_error_handler(host
, ap
, &eh_work_q
);
601 /* If we timed raced normal completion and there is nothing to
602 recover nr_timedout == 0 why exactly are we doing error recovery ? */
603 ata_scsi_port_error_handler(host
, ap
);
605 /* finish or retry handled scmd's and clean up */
606 WARN_ON(host
->host_failed
|| !list_empty(&eh_work_q
));
612 * ata_scsi_cmd_error_handler - error callback for a list of commands
613 * @host: scsi host containing the port
614 * @ap: ATA port within the host
615 * @eh_work_q: list of commands to process
617 * process the given list of commands and return those finished to the
618 * ap->eh_done_q. This function is the first part of the libata error
619 * handler which processes a given list of failed commands.
621 void ata_scsi_cmd_error_handler(struct Scsi_Host
*host
, struct ata_port
*ap
,
622 struct list_head
*eh_work_q
)
627 /* make sure sff pio task is not running */
628 ata_sff_flush_pio_task(ap
);
630 /* synchronize with host lock and sort out timeouts */
632 /* For new EH, all qcs are finished in one of three ways -
633 * normal completion, error completion, and SCSI timeout.
634 * Both completions can race against SCSI timeout. When normal
635 * completion wins, the qc never reaches EH. When error
636 * completion wins, the qc has ATA_QCFLAG_FAILED set.
638 * When SCSI timeout wins, things are a bit more complex.
639 * Normal or error completion can occur after the timeout but
640 * before this point. In such cases, both types of
641 * completions are honored. A scmd is determined to have
642 * timed out iff its associated qc is active and not failed.
644 if (ap
->ops
->error_handler
) {
645 struct scsi_cmnd
*scmd
, *tmp
;
648 spin_lock_irqsave(ap
->lock
, flags
);
650 /* This must occur under the ap->lock as we don't want
651 a polled recovery to race the real interrupt handler
653 The lost_interrupt handler checks for any completed but
654 non-notified command and completes much like an IRQ handler.
656 We then fall into the error recovery code which will treat
657 this as if normal completion won the race */
659 if (ap
->ops
->lost_interrupt
)
660 ap
->ops
->lost_interrupt(ap
);
662 list_for_each_entry_safe(scmd
, tmp
, eh_work_q
, eh_entry
) {
663 struct ata_queued_cmd
*qc
;
665 for (i
= 0; i
< ATA_MAX_QUEUE
; i
++) {
666 qc
= __ata_qc_from_tag(ap
, i
);
667 if (qc
->flags
& ATA_QCFLAG_ACTIVE
&&
672 if (i
< ATA_MAX_QUEUE
) {
673 /* the scmd has an associated qc */
674 if (!(qc
->flags
& ATA_QCFLAG_FAILED
)) {
675 /* which hasn't failed yet, timeout */
676 qc
->err_mask
|= AC_ERR_TIMEOUT
;
677 qc
->flags
|= ATA_QCFLAG_FAILED
;
681 /* Normal completion occurred after
682 * SCSI timeout but before this point.
683 * Successfully complete it.
685 scmd
->retries
= scmd
->allowed
;
686 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
690 /* If we have timed out qcs. They belong to EH from
691 * this point but the state of the controller is
692 * unknown. Freeze the port to make sure the IRQ
693 * handler doesn't diddle with those qcs. This must
694 * be done atomically w.r.t. setting QCFLAG_FAILED.
697 __ata_port_freeze(ap
);
699 spin_unlock_irqrestore(ap
->lock
, flags
);
701 /* initialize eh_tries */
702 ap
->eh_tries
= ATA_EH_MAX_TRIES
;
704 spin_unlock_wait(ap
->lock
);
707 EXPORT_SYMBOL(ata_scsi_cmd_error_handler
);
710 * ata_scsi_port_error_handler - recover the port after the commands
711 * @host: SCSI host containing the port
714 * Handle the recovery of the port @ap after all the commands
715 * have been recovered.
717 void ata_scsi_port_error_handler(struct Scsi_Host
*host
, struct ata_port
*ap
)
721 /* invoke error handler */
722 if (ap
->ops
->error_handler
) {
723 struct ata_link
*link
;
725 /* acquire EH ownership */
728 /* kill fast drain timer */
729 del_timer_sync(&ap
->fastdrain_timer
);
731 /* process port resume request */
732 ata_eh_handle_port_resume(ap
);
734 /* fetch & clear EH info */
735 spin_lock_irqsave(ap
->lock
, flags
);
737 ata_for_each_link(link
, ap
, HOST_FIRST
) {
738 struct ata_eh_context
*ehc
= &link
->eh_context
;
739 struct ata_device
*dev
;
741 memset(&link
->eh_context
, 0, sizeof(link
->eh_context
));
742 link
->eh_context
.i
= link
->eh_info
;
743 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
745 ata_for_each_dev(dev
, link
, ENABLED
) {
746 int devno
= dev
->devno
;
748 ehc
->saved_xfer_mode
[devno
] = dev
->xfer_mode
;
749 if (ata_ncq_enabled(dev
))
750 ehc
->saved_ncq_enabled
|= 1 << devno
;
754 ap
->pflags
|= ATA_PFLAG_EH_IN_PROGRESS
;
755 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
756 ap
->excl_link
= NULL
; /* don't maintain exclusion over EH */
758 spin_unlock_irqrestore(ap
->lock
, flags
);
760 /* invoke EH, skip if unloading or suspended */
761 if (!(ap
->pflags
& (ATA_PFLAG_UNLOADING
| ATA_PFLAG_SUSPENDED
)))
762 ap
->ops
->error_handler(ap
);
764 /* if unloading, commence suicide */
765 if ((ap
->pflags
& ATA_PFLAG_UNLOADING
) &&
766 !(ap
->pflags
& ATA_PFLAG_UNLOADED
))
771 /* process port suspend request */
772 ata_eh_handle_port_suspend(ap
);
774 /* Exception might have happened after ->error_handler
775 * recovered the port but before this point. Repeat
778 spin_lock_irqsave(ap
->lock
, flags
);
780 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
) {
781 if (--ap
->eh_tries
) {
782 spin_unlock_irqrestore(ap
->lock
, flags
);
785 ata_port_printk(ap
, KERN_ERR
, "EH pending after %d "
786 "tries, giving up\n", ATA_EH_MAX_TRIES
);
787 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
790 /* this run is complete, make sure EH info is clear */
791 ata_for_each_link(link
, ap
, HOST_FIRST
)
792 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
794 /* Clear host_eh_scheduled while holding ap->lock such
795 * that if exception occurs after this point but
796 * before EH completion, SCSI midlayer will
799 host
->host_eh_scheduled
= 0;
801 spin_unlock_irqrestore(ap
->lock
, flags
);
804 WARN_ON(ata_qc_from_tag(ap
, ap
->link
.active_tag
) == NULL
);
805 ap
->ops
->eng_timeout(ap
);
808 scsi_eh_flush_done_q(&ap
->eh_done_q
);
811 spin_lock_irqsave(ap
->lock
, flags
);
813 if (ap
->pflags
& ATA_PFLAG_LOADING
)
814 ap
->pflags
&= ~ATA_PFLAG_LOADING
;
815 else if (ap
->pflags
& ATA_PFLAG_SCSI_HOTPLUG
)
816 schedule_delayed_work(&ap
->hotplug_task
, 0);
818 if (ap
->pflags
& ATA_PFLAG_RECOVERED
)
819 ata_port_printk(ap
, KERN_INFO
, "EH complete\n");
821 ap
->pflags
&= ~(ATA_PFLAG_SCSI_HOTPLUG
| ATA_PFLAG_RECOVERED
);
823 /* tell wait_eh that we're done */
824 ap
->pflags
&= ~ATA_PFLAG_EH_IN_PROGRESS
;
825 wake_up_all(&ap
->eh_wait_q
);
827 spin_unlock_irqrestore(ap
->lock
, flags
);
829 EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler
);
832 * ata_port_wait_eh - Wait for the currently pending EH to complete
833 * @ap: Port to wait EH for
835 * Wait until the currently pending EH is complete.
838 * Kernel thread context (may sleep).
840 void ata_port_wait_eh(struct ata_port
*ap
)
846 spin_lock_irqsave(ap
->lock
, flags
);
848 while (ap
->pflags
& (ATA_PFLAG_EH_PENDING
| ATA_PFLAG_EH_IN_PROGRESS
)) {
849 prepare_to_wait(&ap
->eh_wait_q
, &wait
, TASK_UNINTERRUPTIBLE
);
850 spin_unlock_irqrestore(ap
->lock
, flags
);
852 spin_lock_irqsave(ap
->lock
, flags
);
854 finish_wait(&ap
->eh_wait_q
, &wait
);
856 spin_unlock_irqrestore(ap
->lock
, flags
);
858 /* make sure SCSI EH is complete */
859 if (scsi_host_in_recovery(ap
->scsi_host
)) {
865 static int ata_eh_nr_in_flight(struct ata_port
*ap
)
870 /* count only non-internal commands */
871 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++)
872 if (ata_qc_from_tag(ap
, tag
))
878 void ata_eh_fastdrain_timerfn(unsigned long arg
)
880 struct ata_port
*ap
= (void *)arg
;
884 spin_lock_irqsave(ap
->lock
, flags
);
886 cnt
= ata_eh_nr_in_flight(ap
);
892 if (cnt
== ap
->fastdrain_cnt
) {
895 /* No progress during the last interval, tag all
896 * in-flight qcs as timed out and freeze the port.
898 for (tag
= 0; tag
< ATA_MAX_QUEUE
- 1; tag
++) {
899 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
901 qc
->err_mask
|= AC_ERR_TIMEOUT
;
906 /* some qcs have finished, give it another chance */
907 ap
->fastdrain_cnt
= cnt
;
908 ap
->fastdrain_timer
.expires
=
909 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
910 add_timer(&ap
->fastdrain_timer
);
914 spin_unlock_irqrestore(ap
->lock
, flags
);
918 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
919 * @ap: target ATA port
920 * @fastdrain: activate fast drain
922 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
923 * is non-zero and EH wasn't pending before. Fast drain ensures
924 * that EH kicks in in timely manner.
927 * spin_lock_irqsave(host lock)
929 static void ata_eh_set_pending(struct ata_port
*ap
, int fastdrain
)
933 /* already scheduled? */
934 if (ap
->pflags
& ATA_PFLAG_EH_PENDING
)
937 ap
->pflags
|= ATA_PFLAG_EH_PENDING
;
942 /* do we have in-flight qcs? */
943 cnt
= ata_eh_nr_in_flight(ap
);
947 /* activate fast drain */
948 ap
->fastdrain_cnt
= cnt
;
949 ap
->fastdrain_timer
.expires
=
950 ata_deadline(jiffies
, ATA_EH_FASTDRAIN_INTERVAL
);
951 add_timer(&ap
->fastdrain_timer
);
955 * ata_qc_schedule_eh - schedule qc for error handling
956 * @qc: command to schedule error handling for
958 * Schedule error handling for @qc. EH will kick in as soon as
959 * other commands are drained.
962 * spin_lock_irqsave(host lock)
964 void ata_qc_schedule_eh(struct ata_queued_cmd
*qc
)
966 struct ata_port
*ap
= qc
->ap
;
967 struct request_queue
*q
= qc
->scsicmd
->device
->request_queue
;
970 WARN_ON(!ap
->ops
->error_handler
);
972 qc
->flags
|= ATA_QCFLAG_FAILED
;
973 ata_eh_set_pending(ap
, 1);
975 /* The following will fail if timeout has already expired.
976 * ata_scsi_error() takes care of such scmds on EH entry.
977 * Note that ATA_QCFLAG_FAILED is unconditionally set after
978 * this function completes.
980 spin_lock_irqsave(q
->queue_lock
, flags
);
981 blk_abort_request(qc
->scsicmd
->request
);
982 spin_unlock_irqrestore(q
->queue_lock
, flags
);
986 * ata_port_schedule_eh - schedule error handling without a qc
987 * @ap: ATA port to schedule EH for
989 * Schedule error handling for @ap. EH will kick in as soon as
990 * all commands are drained.
993 * spin_lock_irqsave(host lock)
995 void ata_port_schedule_eh(struct ata_port
*ap
)
997 WARN_ON(!ap
->ops
->error_handler
);
999 if (ap
->pflags
& ATA_PFLAG_INITIALIZING
)
1002 ata_eh_set_pending(ap
, 1);
1003 scsi_schedule_eh(ap
->scsi_host
);
1005 DPRINTK("port EH scheduled\n");
1008 static int ata_do_link_abort(struct ata_port
*ap
, struct ata_link
*link
)
1010 int tag
, nr_aborted
= 0;
1012 WARN_ON(!ap
->ops
->error_handler
);
1014 /* we're gonna abort all commands, no need for fast drain */
1015 ata_eh_set_pending(ap
, 0);
1017 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1018 struct ata_queued_cmd
*qc
= ata_qc_from_tag(ap
, tag
);
1020 if (qc
&& (!link
|| qc
->dev
->link
== link
)) {
1021 qc
->flags
|= ATA_QCFLAG_FAILED
;
1022 ata_qc_complete(qc
);
1028 ata_port_schedule_eh(ap
);
1034 * ata_link_abort - abort all qc's on the link
1035 * @link: ATA link to abort qc's for
1037 * Abort all active qc's active on @link and schedule EH.
1040 * spin_lock_irqsave(host lock)
1043 * Number of aborted qc's.
1045 int ata_link_abort(struct ata_link
*link
)
1047 return ata_do_link_abort(link
->ap
, link
);
1051 * ata_port_abort - abort all qc's on the port
1052 * @ap: ATA port to abort qc's for
1054 * Abort all active qc's of @ap and schedule EH.
1057 * spin_lock_irqsave(host_set lock)
1060 * Number of aborted qc's.
1062 int ata_port_abort(struct ata_port
*ap
)
1064 return ata_do_link_abort(ap
, NULL
);
1068 * __ata_port_freeze - freeze port
1069 * @ap: ATA port to freeze
1071 * This function is called when HSM violation or some other
1072 * condition disrupts normal operation of the port. Frozen port
1073 * is not allowed to perform any operation until the port is
1074 * thawed, which usually follows a successful reset.
1076 * ap->ops->freeze() callback can be used for freezing the port
1077 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1078 * port cannot be frozen hardware-wise, the interrupt handler
1079 * must ack and clear interrupts unconditionally while the port
1083 * spin_lock_irqsave(host lock)
1085 static void __ata_port_freeze(struct ata_port
*ap
)
1087 WARN_ON(!ap
->ops
->error_handler
);
1089 if (ap
->ops
->freeze
)
1090 ap
->ops
->freeze(ap
);
1092 ap
->pflags
|= ATA_PFLAG_FROZEN
;
1094 DPRINTK("ata%u port frozen\n", ap
->print_id
);
1098 * ata_port_freeze - abort & freeze port
1099 * @ap: ATA port to freeze
1101 * Abort and freeze @ap. The freeze operation must be called
1102 * first, because some hardware requires special operations
1103 * before the taskfile registers are accessible.
1106 * spin_lock_irqsave(host lock)
1109 * Number of aborted commands.
1111 int ata_port_freeze(struct ata_port
*ap
)
1115 WARN_ON(!ap
->ops
->error_handler
);
1117 __ata_port_freeze(ap
);
1118 nr_aborted
= ata_port_abort(ap
);
1124 * sata_async_notification - SATA async notification handler
1125 * @ap: ATA port where async notification is received
1127 * Handler to be called when async notification via SDB FIS is
1128 * received. This function schedules EH if necessary.
1131 * spin_lock_irqsave(host lock)
1134 * 1 if EH is scheduled, 0 otherwise.
1136 int sata_async_notification(struct ata_port
*ap
)
1141 if (!(ap
->flags
& ATA_FLAG_AN
))
1144 rc
= sata_scr_read(&ap
->link
, SCR_NOTIFICATION
, &sntf
);
1146 sata_scr_write(&ap
->link
, SCR_NOTIFICATION
, sntf
);
1148 if (!sata_pmp_attached(ap
) || rc
) {
1149 /* PMP is not attached or SNTF is not available */
1150 if (!sata_pmp_attached(ap
)) {
1151 /* PMP is not attached. Check whether ATAPI
1152 * AN is configured. If so, notify media
1155 struct ata_device
*dev
= ap
->link
.device
;
1157 if ((dev
->class == ATA_DEV_ATAPI
) &&
1158 (dev
->flags
& ATA_DFLAG_AN
))
1159 ata_scsi_media_change_notify(dev
);
1162 /* PMP is attached but SNTF is not available.
1163 * ATAPI async media change notification is
1164 * not used. The PMP must be reporting PHY
1165 * status change, schedule EH.
1167 ata_port_schedule_eh(ap
);
1171 /* PMP is attached and SNTF is available */
1172 struct ata_link
*link
;
1174 /* check and notify ATAPI AN */
1175 ata_for_each_link(link
, ap
, EDGE
) {
1176 if (!(sntf
& (1 << link
->pmp
)))
1179 if ((link
->device
->class == ATA_DEV_ATAPI
) &&
1180 (link
->device
->flags
& ATA_DFLAG_AN
))
1181 ata_scsi_media_change_notify(link
->device
);
1184 /* If PMP is reporting that PHY status of some
1185 * downstream ports has changed, schedule EH.
1187 if (sntf
& (1 << SATA_PMP_CTRL_PORT
)) {
1188 ata_port_schedule_eh(ap
);
1197 * ata_eh_freeze_port - EH helper to freeze port
1198 * @ap: ATA port to freeze
1205 void ata_eh_freeze_port(struct ata_port
*ap
)
1207 unsigned long flags
;
1209 if (!ap
->ops
->error_handler
)
1212 spin_lock_irqsave(ap
->lock
, flags
);
1213 __ata_port_freeze(ap
);
1214 spin_unlock_irqrestore(ap
->lock
, flags
);
1218 * ata_port_thaw_port - EH helper to thaw port
1219 * @ap: ATA port to thaw
1221 * Thaw frozen port @ap.
1226 void ata_eh_thaw_port(struct ata_port
*ap
)
1228 unsigned long flags
;
1230 if (!ap
->ops
->error_handler
)
1233 spin_lock_irqsave(ap
->lock
, flags
);
1235 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
1240 spin_unlock_irqrestore(ap
->lock
, flags
);
1242 DPRINTK("ata%u port thawed\n", ap
->print_id
);
1245 static void ata_eh_scsidone(struct scsi_cmnd
*scmd
)
1250 static void __ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1252 struct ata_port
*ap
= qc
->ap
;
1253 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1254 unsigned long flags
;
1256 spin_lock_irqsave(ap
->lock
, flags
);
1257 qc
->scsidone
= ata_eh_scsidone
;
1258 __ata_qc_complete(qc
);
1259 WARN_ON(ata_tag_valid(qc
->tag
));
1260 spin_unlock_irqrestore(ap
->lock
, flags
);
1262 scsi_eh_finish_cmd(scmd
, &ap
->eh_done_q
);
1266 * ata_eh_qc_complete - Complete an active ATA command from EH
1267 * @qc: Command to complete
1269 * Indicate to the mid and upper layers that an ATA command has
1270 * completed. To be used from EH.
1272 void ata_eh_qc_complete(struct ata_queued_cmd
*qc
)
1274 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1275 scmd
->retries
= scmd
->allowed
;
1276 __ata_eh_qc_complete(qc
);
1280 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1281 * @qc: Command to retry
1283 * Indicate to the mid and upper layers that an ATA command
1284 * should be retried. To be used from EH.
1286 * SCSI midlayer limits the number of retries to scmd->allowed.
1287 * scmd->retries is decremented for commands which get retried
1288 * due to unrelated failures (qc->err_mask is zero).
1290 void ata_eh_qc_retry(struct ata_queued_cmd
*qc
)
1292 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1293 if (!qc
->err_mask
&& scmd
->retries
)
1295 __ata_eh_qc_complete(qc
);
1299 * ata_dev_disable - disable ATA device
1300 * @dev: ATA device to disable
1307 void ata_dev_disable(struct ata_device
*dev
)
1309 if (!ata_dev_enabled(dev
))
1312 if (ata_msg_drv(dev
->link
->ap
))
1313 ata_dev_printk(dev
, KERN_WARNING
, "disabled\n");
1314 ata_acpi_on_disable(dev
);
1315 ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO0
| ATA_DNXFER_QUIET
);
1318 /* From now till the next successful probe, ering is used to
1319 * track probe failures. Clear accumulated device error info.
1321 ata_ering_clear(&dev
->ering
);
1325 * ata_eh_detach_dev - detach ATA device
1326 * @dev: ATA device to detach
1333 void ata_eh_detach_dev(struct ata_device
*dev
)
1335 struct ata_link
*link
= dev
->link
;
1336 struct ata_port
*ap
= link
->ap
;
1337 struct ata_eh_context
*ehc
= &link
->eh_context
;
1338 unsigned long flags
;
1340 ata_dev_disable(dev
);
1342 spin_lock_irqsave(ap
->lock
, flags
);
1344 dev
->flags
&= ~ATA_DFLAG_DETACH
;
1346 if (ata_scsi_offline_dev(dev
)) {
1347 dev
->flags
|= ATA_DFLAG_DETACHED
;
1348 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
1351 /* clear per-dev EH info */
1352 ata_eh_clear_action(link
, dev
, &link
->eh_info
, ATA_EH_PERDEV_MASK
);
1353 ata_eh_clear_action(link
, dev
, &link
->eh_context
.i
, ATA_EH_PERDEV_MASK
);
1354 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
1355 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
1357 spin_unlock_irqrestore(ap
->lock
, flags
);
1361 * ata_eh_about_to_do - about to perform eh_action
1362 * @link: target ATA link
1363 * @dev: target ATA dev for per-dev action (can be NULL)
1364 * @action: action about to be performed
1366 * Called just before performing EH actions to clear related bits
1367 * in @link->eh_info such that eh actions are not unnecessarily
1373 void ata_eh_about_to_do(struct ata_link
*link
, struct ata_device
*dev
,
1374 unsigned int action
)
1376 struct ata_port
*ap
= link
->ap
;
1377 struct ata_eh_info
*ehi
= &link
->eh_info
;
1378 struct ata_eh_context
*ehc
= &link
->eh_context
;
1379 unsigned long flags
;
1381 spin_lock_irqsave(ap
->lock
, flags
);
1383 ata_eh_clear_action(link
, dev
, ehi
, action
);
1385 /* About to take EH action, set RECOVERED. Ignore actions on
1386 * slave links as master will do them again.
1388 if (!(ehc
->i
.flags
& ATA_EHI_QUIET
) && link
!= ap
->slave_link
)
1389 ap
->pflags
|= ATA_PFLAG_RECOVERED
;
1391 spin_unlock_irqrestore(ap
->lock
, flags
);
1395 * ata_eh_done - EH action complete
1396 * @ap: target ATA port
1397 * @dev: target ATA dev for per-dev action (can be NULL)
1398 * @action: action just completed
1400 * Called right after performing EH actions to clear related bits
1401 * in @link->eh_context.
1406 void ata_eh_done(struct ata_link
*link
, struct ata_device
*dev
,
1407 unsigned int action
)
1409 struct ata_eh_context
*ehc
= &link
->eh_context
;
1411 ata_eh_clear_action(link
, dev
, &ehc
->i
, action
);
1415 * ata_err_string - convert err_mask to descriptive string
1416 * @err_mask: error mask to convert to string
1418 * Convert @err_mask to descriptive string. Errors are
1419 * prioritized according to severity and only the most severe
1420 * error is reported.
1426 * Descriptive string for @err_mask
1428 static const char *ata_err_string(unsigned int err_mask
)
1430 if (err_mask
& AC_ERR_HOST_BUS
)
1431 return "host bus error";
1432 if (err_mask
& AC_ERR_ATA_BUS
)
1433 return "ATA bus error";
1434 if (err_mask
& AC_ERR_TIMEOUT
)
1436 if (err_mask
& AC_ERR_HSM
)
1437 return "HSM violation";
1438 if (err_mask
& AC_ERR_SYSTEM
)
1439 return "internal error";
1440 if (err_mask
& AC_ERR_MEDIA
)
1441 return "media error";
1442 if (err_mask
& AC_ERR_INVALID
)
1443 return "invalid argument";
1444 if (err_mask
& AC_ERR_DEV
)
1445 return "device error";
1446 return "unknown error";
1450 * ata_read_log_page - read a specific log page
1451 * @dev: target device
1452 * @page: page to read
1453 * @buf: buffer to store read page
1454 * @sectors: number of sectors to read
1456 * Read log page using READ_LOG_EXT command.
1459 * Kernel thread context (may sleep).
1462 * 0 on success, AC_ERR_* mask otherwise.
1464 static unsigned int ata_read_log_page(struct ata_device
*dev
,
1465 u8 page
, void *buf
, unsigned int sectors
)
1467 struct ata_taskfile tf
;
1468 unsigned int err_mask
;
1470 DPRINTK("read log page - page %d\n", page
);
1472 ata_tf_init(dev
, &tf
);
1473 tf
.command
= ATA_CMD_READ_LOG_EXT
;
1476 tf
.hob_nsect
= sectors
>> 8;
1477 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA48
| ATA_TFLAG_DEVICE
;
1478 tf
.protocol
= ATA_PROT_PIO
;
1480 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_FROM_DEVICE
,
1481 buf
, sectors
* ATA_SECT_SIZE
, 0);
1483 DPRINTK("EXIT, err_mask=%x\n", err_mask
);
1488 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1489 * @dev: Device to read log page 10h from
1490 * @tag: Resulting tag of the failed command
1491 * @tf: Resulting taskfile registers of the failed command
1493 * Read log page 10h to obtain NCQ error details and clear error
1497 * Kernel thread context (may sleep).
1500 * 0 on success, -errno otherwise.
1502 static int ata_eh_read_log_10h(struct ata_device
*dev
,
1503 int *tag
, struct ata_taskfile
*tf
)
1505 u8
*buf
= dev
->link
->ap
->sector_buf
;
1506 unsigned int err_mask
;
1510 err_mask
= ata_read_log_page(dev
, ATA_LOG_SATA_NCQ
, buf
, 1);
1515 for (i
= 0; i
< ATA_SECT_SIZE
; i
++)
1518 ata_dev_printk(dev
, KERN_WARNING
,
1519 "invalid checksum 0x%x on log page 10h\n", csum
);
1524 *tag
= buf
[0] & 0x1f;
1526 tf
->command
= buf
[2];
1527 tf
->feature
= buf
[3];
1531 tf
->device
= buf
[7];
1532 tf
->hob_lbal
= buf
[8];
1533 tf
->hob_lbam
= buf
[9];
1534 tf
->hob_lbah
= buf
[10];
1535 tf
->nsect
= buf
[12];
1536 tf
->hob_nsect
= buf
[13];
1542 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1543 * @dev: target ATAPI device
1544 * @r_sense_key: out parameter for sense_key
1546 * Perform ATAPI TEST_UNIT_READY.
1549 * EH context (may sleep).
1552 * 0 on success, AC_ERR_* mask on failure.
1554 static unsigned int atapi_eh_tur(struct ata_device
*dev
, u8
*r_sense_key
)
1556 u8 cdb
[ATAPI_CDB_LEN
] = { TEST_UNIT_READY
, 0, 0, 0, 0, 0 };
1557 struct ata_taskfile tf
;
1558 unsigned int err_mask
;
1560 ata_tf_init(dev
, &tf
);
1562 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1563 tf
.command
= ATA_CMD_PACKET
;
1564 tf
.protocol
= ATAPI_PROT_NODATA
;
1566 err_mask
= ata_exec_internal(dev
, &tf
, cdb
, DMA_NONE
, NULL
, 0, 0);
1567 if (err_mask
== AC_ERR_DEV
)
1568 *r_sense_key
= tf
.feature
>> 4;
1573 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1574 * @dev: device to perform REQUEST_SENSE to
1575 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1576 * @dfl_sense_key: default sense key to use
1578 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1579 * SENSE. This function is EH helper.
1582 * Kernel thread context (may sleep).
1585 * 0 on success, AC_ERR_* mask on failure
1587 static unsigned int atapi_eh_request_sense(struct ata_device
*dev
,
1588 u8
*sense_buf
, u8 dfl_sense_key
)
1590 u8 cdb
[ATAPI_CDB_LEN
] =
1591 { REQUEST_SENSE
, 0, 0, 0, SCSI_SENSE_BUFFERSIZE
, 0 };
1592 struct ata_port
*ap
= dev
->link
->ap
;
1593 struct ata_taskfile tf
;
1595 DPRINTK("ATAPI request sense\n");
1597 /* FIXME: is this needed? */
1598 memset(sense_buf
, 0, SCSI_SENSE_BUFFERSIZE
);
1600 /* initialize sense_buf with the error register,
1601 * for the case where they are -not- overwritten
1603 sense_buf
[0] = 0x70;
1604 sense_buf
[2] = dfl_sense_key
;
1606 /* some devices time out if garbage left in tf */
1607 ata_tf_init(dev
, &tf
);
1609 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1610 tf
.command
= ATA_CMD_PACKET
;
1612 /* is it pointless to prefer PIO for "safety reasons"? */
1613 if (ap
->flags
& ATA_FLAG_PIO_DMA
) {
1614 tf
.protocol
= ATAPI_PROT_DMA
;
1615 tf
.feature
|= ATAPI_PKT_DMA
;
1617 tf
.protocol
= ATAPI_PROT_PIO
;
1618 tf
.lbam
= SCSI_SENSE_BUFFERSIZE
;
1622 return ata_exec_internal(dev
, &tf
, cdb
, DMA_FROM_DEVICE
,
1623 sense_buf
, SCSI_SENSE_BUFFERSIZE
, 0);
1627 * ata_eh_analyze_serror - analyze SError for a failed port
1628 * @link: ATA link to analyze SError for
1630 * Analyze SError if available and further determine cause of
1636 static void ata_eh_analyze_serror(struct ata_link
*link
)
1638 struct ata_eh_context
*ehc
= &link
->eh_context
;
1639 u32 serror
= ehc
->i
.serror
;
1640 unsigned int err_mask
= 0, action
= 0;
1643 if (serror
& (SERR_PERSISTENT
| SERR_DATA
)) {
1644 err_mask
|= AC_ERR_ATA_BUS
;
1645 action
|= ATA_EH_RESET
;
1647 if (serror
& SERR_PROTOCOL
) {
1648 err_mask
|= AC_ERR_HSM
;
1649 action
|= ATA_EH_RESET
;
1651 if (serror
& SERR_INTERNAL
) {
1652 err_mask
|= AC_ERR_SYSTEM
;
1653 action
|= ATA_EH_RESET
;
1656 /* Determine whether a hotplug event has occurred. Both
1657 * SError.N/X are considered hotplug events for enabled or
1658 * host links. For disabled PMP links, only N bit is
1659 * considered as X bit is left at 1 for link plugging.
1661 if (link
->lpm_policy
> ATA_LPM_MAX_POWER
)
1662 hotplug_mask
= 0; /* hotplug doesn't work w/ LPM */
1663 else if (!(link
->flags
& ATA_LFLAG_DISABLED
) || ata_is_host_link(link
))
1664 hotplug_mask
= SERR_PHYRDY_CHG
| SERR_DEV_XCHG
;
1666 hotplug_mask
= SERR_PHYRDY_CHG
;
1668 if (serror
& hotplug_mask
)
1669 ata_ehi_hotplugged(&ehc
->i
);
1671 ehc
->i
.err_mask
|= err_mask
;
1672 ehc
->i
.action
|= action
;
1676 * ata_eh_analyze_ncq_error - analyze NCQ error
1677 * @link: ATA link to analyze NCQ error for
1679 * Read log page 10h, determine the offending qc and acquire
1680 * error status TF. For NCQ device errors, all LLDDs have to do
1681 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1685 * Kernel thread context (may sleep).
1687 void ata_eh_analyze_ncq_error(struct ata_link
*link
)
1689 struct ata_port
*ap
= link
->ap
;
1690 struct ata_eh_context
*ehc
= &link
->eh_context
;
1691 struct ata_device
*dev
= link
->device
;
1692 struct ata_queued_cmd
*qc
;
1693 struct ata_taskfile tf
;
1696 /* if frozen, we can't do much */
1697 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
1700 /* is it NCQ device error? */
1701 if (!link
->sactive
|| !(ehc
->i
.err_mask
& AC_ERR_DEV
))
1704 /* has LLDD analyzed already? */
1705 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
1706 qc
= __ata_qc_from_tag(ap
, tag
);
1708 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
1715 /* okay, this error is ours */
1716 memset(&tf
, 0, sizeof(tf
));
1717 rc
= ata_eh_read_log_10h(dev
, &tag
, &tf
);
1719 ata_link_printk(link
, KERN_ERR
, "failed to read log page 10h "
1720 "(errno=%d)\n", rc
);
1724 if (!(link
->sactive
& (1 << tag
))) {
1725 ata_link_printk(link
, KERN_ERR
, "log page 10h reported "
1726 "inactive tag %d\n", tag
);
1730 /* we've got the perpetrator, condemn it */
1731 qc
= __ata_qc_from_tag(ap
, tag
);
1732 memcpy(&qc
->result_tf
, &tf
, sizeof(tf
));
1733 qc
->result_tf
.flags
= ATA_TFLAG_ISADDR
| ATA_TFLAG_LBA
| ATA_TFLAG_LBA48
;
1734 qc
->err_mask
|= AC_ERR_DEV
| AC_ERR_NCQ
;
1735 ehc
->i
.err_mask
&= ~AC_ERR_DEV
;
1739 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1740 * @qc: qc to analyze
1741 * @tf: Taskfile registers to analyze
1743 * Analyze taskfile of @qc and further determine cause of
1744 * failure. This function also requests ATAPI sense data if
1748 * Kernel thread context (may sleep).
1751 * Determined recovery action
1753 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd
*qc
,
1754 const struct ata_taskfile
*tf
)
1756 unsigned int tmp
, action
= 0;
1757 u8 stat
= tf
->command
, err
= tf
->feature
;
1759 if ((stat
& (ATA_BUSY
| ATA_DRQ
| ATA_DRDY
)) != ATA_DRDY
) {
1760 qc
->err_mask
|= AC_ERR_HSM
;
1761 return ATA_EH_RESET
;
1764 if (stat
& (ATA_ERR
| ATA_DF
))
1765 qc
->err_mask
|= AC_ERR_DEV
;
1769 switch (qc
->dev
->class) {
1772 qc
->err_mask
|= AC_ERR_ATA_BUS
;
1774 qc
->err_mask
|= AC_ERR_MEDIA
;
1776 qc
->err_mask
|= AC_ERR_INVALID
;
1780 if (!(qc
->ap
->pflags
& ATA_PFLAG_FROZEN
)) {
1781 tmp
= atapi_eh_request_sense(qc
->dev
,
1782 qc
->scsicmd
->sense_buffer
,
1783 qc
->result_tf
.feature
>> 4);
1785 /* ATA_QCFLAG_SENSE_VALID is used to
1786 * tell atapi_qc_complete() that sense
1787 * data is already valid.
1789 * TODO: interpret sense data and set
1790 * appropriate err_mask.
1792 qc
->flags
|= ATA_QCFLAG_SENSE_VALID
;
1794 qc
->err_mask
|= tmp
;
1798 if (qc
->err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
| AC_ERR_ATA_BUS
))
1799 action
|= ATA_EH_RESET
;
1804 static int ata_eh_categorize_error(unsigned int eflags
, unsigned int err_mask
,
1809 if (!(eflags
& ATA_EFLAG_DUBIOUS_XFER
))
1813 base
= ATA_ECAT_DUBIOUS_NONE
;
1815 if (err_mask
& AC_ERR_ATA_BUS
)
1816 return base
+ ATA_ECAT_ATA_BUS
;
1818 if (err_mask
& AC_ERR_TIMEOUT
)
1819 return base
+ ATA_ECAT_TOUT_HSM
;
1821 if (eflags
& ATA_EFLAG_IS_IO
) {
1822 if (err_mask
& AC_ERR_HSM
)
1823 return base
+ ATA_ECAT_TOUT_HSM
;
1825 (AC_ERR_DEV
|AC_ERR_MEDIA
|AC_ERR_INVALID
)) == AC_ERR_DEV
)
1826 return base
+ ATA_ECAT_UNK_DEV
;
1832 struct speed_down_verdict_arg
{
1835 int nr_errors
[ATA_ECAT_NR
];
1838 static int speed_down_verdict_cb(struct ata_ering_entry
*ent
, void *void_arg
)
1840 struct speed_down_verdict_arg
*arg
= void_arg
;
1843 if ((ent
->eflags
& ATA_EFLAG_OLD_ER
) || (ent
->timestamp
< arg
->since
))
1846 cat
= ata_eh_categorize_error(ent
->eflags
, ent
->err_mask
,
1848 arg
->nr_errors
[cat
]++;
1854 * ata_eh_speed_down_verdict - Determine speed down verdict
1855 * @dev: Device of interest
1857 * This function examines error ring of @dev and determines
1858 * whether NCQ needs to be turned off, transfer speed should be
1859 * stepped down, or falling back to PIO is necessary.
1861 * ECAT_ATA_BUS : ATA_BUS error for any command
1863 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1866 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1868 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1869 * data transfer hasn't been verified.
1873 * NCQ_OFF : Turn off NCQ.
1875 * SPEED_DOWN : Speed down transfer speed but don't fall back
1878 * FALLBACK_TO_PIO : Fall back to PIO.
1880 * Even if multiple verdicts are returned, only one action is
1881 * taken per error. An action triggered by non-DUBIOUS errors
1882 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1883 * This is to expedite speed down decisions right after device is
1884 * initially configured.
1886 * The followings are speed down rules. #1 and #2 deal with
1889 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1890 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1892 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1893 * occurred during last 5 mins, NCQ_OFF.
1895 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1896 * occurred during last 5 mins, FALLBACK_TO_PIO
1898 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1899 * during last 10 mins, NCQ_OFF.
1901 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1902 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1905 * Inherited from caller.
1908 * OR of ATA_EH_SPDN_* flags.
1910 static unsigned int ata_eh_speed_down_verdict(struct ata_device
*dev
)
1912 const u64 j5mins
= 5LLU * 60 * HZ
, j10mins
= 10LLU * 60 * HZ
;
1913 u64 j64
= get_jiffies_64();
1914 struct speed_down_verdict_arg arg
;
1915 unsigned int verdict
= 0;
1917 /* scan past 5 mins of error history */
1918 memset(&arg
, 0, sizeof(arg
));
1919 arg
.since
= j64
- min(j64
, j5mins
);
1920 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1922 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_ATA_BUS
] +
1923 arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] > 1)
1924 verdict
|= ATA_EH_SPDN_SPEED_DOWN
|
1925 ATA_EH_SPDN_FALLBACK_TO_PIO
| ATA_EH_SPDN_KEEP_ERRORS
;
1927 if (arg
.nr_errors
[ATA_ECAT_DUBIOUS_TOUT_HSM
] +
1928 arg
.nr_errors
[ATA_ECAT_DUBIOUS_UNK_DEV
] > 1)
1929 verdict
|= ATA_EH_SPDN_NCQ_OFF
| ATA_EH_SPDN_KEEP_ERRORS
;
1931 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1932 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1933 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1934 verdict
|= ATA_EH_SPDN_FALLBACK_TO_PIO
;
1936 /* scan past 10 mins of error history */
1937 memset(&arg
, 0, sizeof(arg
));
1938 arg
.since
= j64
- min(j64
, j10mins
);
1939 ata_ering_map(&dev
->ering
, speed_down_verdict_cb
, &arg
);
1941 if (arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] +
1942 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 3)
1943 verdict
|= ATA_EH_SPDN_NCQ_OFF
;
1945 if (arg
.nr_errors
[ATA_ECAT_ATA_BUS
] +
1946 arg
.nr_errors
[ATA_ECAT_TOUT_HSM
] > 3 ||
1947 arg
.nr_errors
[ATA_ECAT_UNK_DEV
] > 6)
1948 verdict
|= ATA_EH_SPDN_SPEED_DOWN
;
1954 * ata_eh_speed_down - record error and speed down if necessary
1955 * @dev: Failed device
1956 * @eflags: mask of ATA_EFLAG_* flags
1957 * @err_mask: err_mask of the error
1959 * Record error and examine error history to determine whether
1960 * adjusting transmission speed is necessary. It also sets
1961 * transmission limits appropriately if such adjustment is
1965 * Kernel thread context (may sleep).
1968 * Determined recovery action.
1970 static unsigned int ata_eh_speed_down(struct ata_device
*dev
,
1971 unsigned int eflags
, unsigned int err_mask
)
1973 struct ata_link
*link
= ata_dev_phys_link(dev
);
1975 unsigned int verdict
;
1976 unsigned int action
= 0;
1978 /* don't bother if Cat-0 error */
1979 if (ata_eh_categorize_error(eflags
, err_mask
, &xfer_ok
) == 0)
1982 /* record error and determine whether speed down is necessary */
1983 ata_ering_record(&dev
->ering
, eflags
, err_mask
);
1984 verdict
= ata_eh_speed_down_verdict(dev
);
1987 if ((verdict
& ATA_EH_SPDN_NCQ_OFF
) &&
1988 (dev
->flags
& (ATA_DFLAG_PIO
| ATA_DFLAG_NCQ
|
1989 ATA_DFLAG_NCQ_OFF
)) == ATA_DFLAG_NCQ
) {
1990 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
1991 ata_dev_printk(dev
, KERN_WARNING
,
1992 "NCQ disabled due to excessive errors\n");
1997 if (verdict
& ATA_EH_SPDN_SPEED_DOWN
) {
1998 /* speed down SATA link speed if possible */
1999 if (sata_down_spd_limit(link
, 0) == 0) {
2000 action
|= ATA_EH_RESET
;
2004 /* lower transfer mode */
2005 if (dev
->spdn_cnt
< 2) {
2006 static const int dma_dnxfer_sel
[] =
2007 { ATA_DNXFER_DMA
, ATA_DNXFER_40C
};
2008 static const int pio_dnxfer_sel
[] =
2009 { ATA_DNXFER_PIO
, ATA_DNXFER_FORCE_PIO0
};
2012 if (dev
->xfer_shift
!= ATA_SHIFT_PIO
)
2013 sel
= dma_dnxfer_sel
[dev
->spdn_cnt
];
2015 sel
= pio_dnxfer_sel
[dev
->spdn_cnt
];
2019 if (ata_down_xfermask_limit(dev
, sel
) == 0) {
2020 action
|= ATA_EH_RESET
;
2026 /* Fall back to PIO? Slowing down to PIO is meaningless for
2027 * SATA ATA devices. Consider it only for PATA and SATAPI.
2029 if ((verdict
& ATA_EH_SPDN_FALLBACK_TO_PIO
) && (dev
->spdn_cnt
>= 2) &&
2030 (link
->ap
->cbl
!= ATA_CBL_SATA
|| dev
->class == ATA_DEV_ATAPI
) &&
2031 (dev
->xfer_shift
!= ATA_SHIFT_PIO
)) {
2032 if (ata_down_xfermask_limit(dev
, ATA_DNXFER_FORCE_PIO
) == 0) {
2034 action
|= ATA_EH_RESET
;
2041 /* device has been slowed down, blow error history */
2042 if (!(verdict
& ATA_EH_SPDN_KEEP_ERRORS
))
2043 ata_ering_clear(&dev
->ering
);
2048 * ata_eh_link_autopsy - analyze error and determine recovery action
2049 * @link: host link to perform autopsy on
2051 * Analyze why @link failed and determine which recovery actions
2052 * are needed. This function also sets more detailed AC_ERR_*
2053 * values and fills sense data for ATAPI CHECK SENSE.
2056 * Kernel thread context (may sleep).
2058 static void ata_eh_link_autopsy(struct ata_link
*link
)
2060 struct ata_port
*ap
= link
->ap
;
2061 struct ata_eh_context
*ehc
= &link
->eh_context
;
2062 struct ata_device
*dev
;
2063 unsigned int all_err_mask
= 0, eflags
= 0;
2070 if (ehc
->i
.flags
& ATA_EHI_NO_AUTOPSY
)
2073 /* obtain and analyze SError */
2074 rc
= sata_scr_read(link
, SCR_ERROR
, &serror
);
2076 ehc
->i
.serror
|= serror
;
2077 ata_eh_analyze_serror(link
);
2078 } else if (rc
!= -EOPNOTSUPP
) {
2079 /* SError read failed, force reset and probing */
2080 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
2081 ehc
->i
.action
|= ATA_EH_RESET
;
2082 ehc
->i
.err_mask
|= AC_ERR_OTHER
;
2085 /* analyze NCQ failure */
2086 ata_eh_analyze_ncq_error(link
);
2088 /* any real error trumps AC_ERR_OTHER */
2089 if (ehc
->i
.err_mask
& ~AC_ERR_OTHER
)
2090 ehc
->i
.err_mask
&= ~AC_ERR_OTHER
;
2092 all_err_mask
|= ehc
->i
.err_mask
;
2094 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2095 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2097 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2098 ata_dev_phys_link(qc
->dev
) != link
)
2101 /* inherit upper level err_mask */
2102 qc
->err_mask
|= ehc
->i
.err_mask
;
2105 ehc
->i
.action
|= ata_eh_analyze_tf(qc
, &qc
->result_tf
);
2107 /* DEV errors are probably spurious in case of ATA_BUS error */
2108 if (qc
->err_mask
& AC_ERR_ATA_BUS
)
2109 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_MEDIA
|
2112 /* any real error trumps unknown error */
2113 if (qc
->err_mask
& ~AC_ERR_OTHER
)
2114 qc
->err_mask
&= ~AC_ERR_OTHER
;
2116 /* SENSE_VALID trumps dev/unknown error and revalidation */
2117 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
)
2118 qc
->err_mask
&= ~(AC_ERR_DEV
| AC_ERR_OTHER
);
2120 /* determine whether the command is worth retrying */
2121 if (qc
->flags
& ATA_QCFLAG_IO
||
2122 (!(qc
->err_mask
& AC_ERR_INVALID
) &&
2123 qc
->err_mask
!= AC_ERR_DEV
))
2124 qc
->flags
|= ATA_QCFLAG_RETRY
;
2126 /* accumulate error info */
2127 ehc
->i
.dev
= qc
->dev
;
2128 all_err_mask
|= qc
->err_mask
;
2129 if (qc
->flags
& ATA_QCFLAG_IO
)
2130 eflags
|= ATA_EFLAG_IS_IO
;
2133 /* enforce default EH actions */
2134 if (ap
->pflags
& ATA_PFLAG_FROZEN
||
2135 all_err_mask
& (AC_ERR_HSM
| AC_ERR_TIMEOUT
))
2136 ehc
->i
.action
|= ATA_EH_RESET
;
2137 else if (((eflags
& ATA_EFLAG_IS_IO
) && all_err_mask
) ||
2138 (!(eflags
& ATA_EFLAG_IS_IO
) && (all_err_mask
& ~AC_ERR_DEV
)))
2139 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2141 /* If we have offending qcs and the associated failed device,
2142 * perform per-dev EH action only on the offending device.
2145 ehc
->i
.dev_action
[ehc
->i
.dev
->devno
] |=
2146 ehc
->i
.action
& ATA_EH_PERDEV_MASK
;
2147 ehc
->i
.action
&= ~ATA_EH_PERDEV_MASK
;
2150 /* propagate timeout to host link */
2151 if ((all_err_mask
& AC_ERR_TIMEOUT
) && !ata_is_host_link(link
))
2152 ap
->link
.eh_context
.i
.err_mask
|= AC_ERR_TIMEOUT
;
2154 /* record error and consider speeding down */
2156 if (!dev
&& ((ata_link_max_devices(link
) == 1 &&
2157 ata_dev_enabled(link
->device
))))
2161 if (dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)
2162 eflags
|= ATA_EFLAG_DUBIOUS_XFER
;
2163 ehc
->i
.action
|= ata_eh_speed_down(dev
, eflags
, all_err_mask
);
2170 * ata_eh_autopsy - analyze error and determine recovery action
2171 * @ap: host port to perform autopsy on
2173 * Analyze all links of @ap and determine why they failed and
2174 * which recovery actions are needed.
2177 * Kernel thread context (may sleep).
2179 void ata_eh_autopsy(struct ata_port
*ap
)
2181 struct ata_link
*link
;
2183 ata_for_each_link(link
, ap
, EDGE
)
2184 ata_eh_link_autopsy(link
);
2186 /* Handle the frigging slave link. Autopsy is done similarly
2187 * but actions and flags are transferred over to the master
2188 * link and handled from there.
2190 if (ap
->slave_link
) {
2191 struct ata_eh_context
*mehc
= &ap
->link
.eh_context
;
2192 struct ata_eh_context
*sehc
= &ap
->slave_link
->eh_context
;
2194 /* transfer control flags from master to slave */
2195 sehc
->i
.flags
|= mehc
->i
.flags
& ATA_EHI_TO_SLAVE_MASK
;
2197 /* perform autopsy on the slave link */
2198 ata_eh_link_autopsy(ap
->slave_link
);
2200 /* transfer actions from slave to master and clear slave */
2201 ata_eh_about_to_do(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2202 mehc
->i
.action
|= sehc
->i
.action
;
2203 mehc
->i
.dev_action
[1] |= sehc
->i
.dev_action
[1];
2204 mehc
->i
.flags
|= sehc
->i
.flags
;
2205 ata_eh_done(ap
->slave_link
, NULL
, ATA_EH_ALL_ACTIONS
);
2208 /* Autopsy of fanout ports can affect host link autopsy.
2209 * Perform host link autopsy last.
2211 if (sata_pmp_attached(ap
))
2212 ata_eh_link_autopsy(&ap
->link
);
2216 * ata_get_cmd_descript - get description for ATA command
2217 * @command: ATA command code to get description for
2219 * Return a textual description of the given command, or NULL if the
2220 * command is not known.
2225 const char *ata_get_cmd_descript(u8 command
)
2227 #ifdef CONFIG_ATA_VERBOSE_ERROR
2233 { ATA_CMD_DEV_RESET
, "DEVICE RESET" },
2234 { ATA_CMD_CHK_POWER
, "CHECK POWER MODE" },
2235 { ATA_CMD_STANDBY
, "STANDBY" },
2236 { ATA_CMD_IDLE
, "IDLE" },
2237 { ATA_CMD_EDD
, "EXECUTE DEVICE DIAGNOSTIC" },
2238 { ATA_CMD_DOWNLOAD_MICRO
, "DOWNLOAD MICROCODE" },
2239 { ATA_CMD_NOP
, "NOP" },
2240 { ATA_CMD_FLUSH
, "FLUSH CACHE" },
2241 { ATA_CMD_FLUSH_EXT
, "FLUSH CACHE EXT" },
2242 { ATA_CMD_ID_ATA
, "IDENTIFY DEVICE" },
2243 { ATA_CMD_ID_ATAPI
, "IDENTIFY PACKET DEVICE" },
2244 { ATA_CMD_SERVICE
, "SERVICE" },
2245 { ATA_CMD_READ
, "READ DMA" },
2246 { ATA_CMD_READ_EXT
, "READ DMA EXT" },
2247 { ATA_CMD_READ_QUEUED
, "READ DMA QUEUED" },
2248 { ATA_CMD_READ_STREAM_EXT
, "READ STREAM EXT" },
2249 { ATA_CMD_READ_STREAM_DMA_EXT
, "READ STREAM DMA EXT" },
2250 { ATA_CMD_WRITE
, "WRITE DMA" },
2251 { ATA_CMD_WRITE_EXT
, "WRITE DMA EXT" },
2252 { ATA_CMD_WRITE_QUEUED
, "WRITE DMA QUEUED EXT" },
2253 { ATA_CMD_WRITE_STREAM_EXT
, "WRITE STREAM EXT" },
2254 { ATA_CMD_WRITE_STREAM_DMA_EXT
, "WRITE STREAM DMA EXT" },
2255 { ATA_CMD_WRITE_FUA_EXT
, "WRITE DMA FUA EXT" },
2256 { ATA_CMD_WRITE_QUEUED_FUA_EXT
, "WRITE DMA QUEUED FUA EXT" },
2257 { ATA_CMD_FPDMA_READ
, "READ FPDMA QUEUED" },
2258 { ATA_CMD_FPDMA_WRITE
, "WRITE FPDMA QUEUED" },
2259 { ATA_CMD_PIO_READ
, "READ SECTOR(S)" },
2260 { ATA_CMD_PIO_READ_EXT
, "READ SECTOR(S) EXT" },
2261 { ATA_CMD_PIO_WRITE
, "WRITE SECTOR(S)" },
2262 { ATA_CMD_PIO_WRITE_EXT
, "WRITE SECTOR(S) EXT" },
2263 { ATA_CMD_READ_MULTI
, "READ MULTIPLE" },
2264 { ATA_CMD_READ_MULTI_EXT
, "READ MULTIPLE EXT" },
2265 { ATA_CMD_WRITE_MULTI
, "WRITE MULTIPLE" },
2266 { ATA_CMD_WRITE_MULTI_EXT
, "WRITE MULTIPLE EXT" },
2267 { ATA_CMD_WRITE_MULTI_FUA_EXT
, "WRITE MULTIPLE FUA EXT" },
2268 { ATA_CMD_SET_FEATURES
, "SET FEATURES" },
2269 { ATA_CMD_SET_MULTI
, "SET MULTIPLE MODE" },
2270 { ATA_CMD_VERIFY
, "READ VERIFY SECTOR(S)" },
2271 { ATA_CMD_VERIFY_EXT
, "READ VERIFY SECTOR(S) EXT" },
2272 { ATA_CMD_WRITE_UNCORR_EXT
, "WRITE UNCORRECTABLE EXT" },
2273 { ATA_CMD_STANDBYNOW1
, "STANDBY IMMEDIATE" },
2274 { ATA_CMD_IDLEIMMEDIATE
, "IDLE IMMEDIATE" },
2275 { ATA_CMD_SLEEP
, "SLEEP" },
2276 { ATA_CMD_INIT_DEV_PARAMS
, "INITIALIZE DEVICE PARAMETERS" },
2277 { ATA_CMD_READ_NATIVE_MAX
, "READ NATIVE MAX ADDRESS" },
2278 { ATA_CMD_READ_NATIVE_MAX_EXT
, "READ NATIVE MAX ADDRESS EXT" },
2279 { ATA_CMD_SET_MAX
, "SET MAX ADDRESS" },
2280 { ATA_CMD_SET_MAX_EXT
, "SET MAX ADDRESS EXT" },
2281 { ATA_CMD_READ_LOG_EXT
, "READ LOG EXT" },
2282 { ATA_CMD_WRITE_LOG_EXT
, "WRITE LOG EXT" },
2283 { ATA_CMD_READ_LOG_DMA_EXT
, "READ LOG DMA EXT" },
2284 { ATA_CMD_WRITE_LOG_DMA_EXT
, "WRITE LOG DMA EXT" },
2285 { ATA_CMD_TRUSTED_RCV
, "TRUSTED RECEIVE" },
2286 { ATA_CMD_TRUSTED_RCV_DMA
, "TRUSTED RECEIVE DMA" },
2287 { ATA_CMD_TRUSTED_SND
, "TRUSTED SEND" },
2288 { ATA_CMD_TRUSTED_SND_DMA
, "TRUSTED SEND DMA" },
2289 { ATA_CMD_PMP_READ
, "READ BUFFER" },
2290 { ATA_CMD_PMP_WRITE
, "WRITE BUFFER" },
2291 { ATA_CMD_CONF_OVERLAY
, "DEVICE CONFIGURATION OVERLAY" },
2292 { ATA_CMD_SEC_SET_PASS
, "SECURITY SET PASSWORD" },
2293 { ATA_CMD_SEC_UNLOCK
, "SECURITY UNLOCK" },
2294 { ATA_CMD_SEC_ERASE_PREP
, "SECURITY ERASE PREPARE" },
2295 { ATA_CMD_SEC_ERASE_UNIT
, "SECURITY ERASE UNIT" },
2296 { ATA_CMD_SEC_FREEZE_LOCK
, "SECURITY FREEZE LOCK" },
2297 { ATA_CMD_SEC_DISABLE_PASS
, "SECURITY DISABLE PASSWORD" },
2298 { ATA_CMD_CONFIG_STREAM
, "CONFIGURE STREAM" },
2299 { ATA_CMD_SMART
, "SMART" },
2300 { ATA_CMD_MEDIA_LOCK
, "DOOR LOCK" },
2301 { ATA_CMD_MEDIA_UNLOCK
, "DOOR UNLOCK" },
2302 { ATA_CMD_DSM
, "DATA SET MANAGEMENT" },
2303 { ATA_CMD_CHK_MED_CRD_TYP
, "CHECK MEDIA CARD TYPE" },
2304 { ATA_CMD_CFA_REQ_EXT_ERR
, "CFA REQUEST EXTENDED ERROR" },
2305 { ATA_CMD_CFA_WRITE_NE
, "CFA WRITE SECTORS WITHOUT ERASE" },
2306 { ATA_CMD_CFA_TRANS_SECT
, "CFA TRANSLATE SECTOR" },
2307 { ATA_CMD_CFA_ERASE
, "CFA ERASE SECTORS" },
2308 { ATA_CMD_CFA_WRITE_MULT_NE
, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2309 { ATA_CMD_READ_LONG
, "READ LONG (with retries)" },
2310 { ATA_CMD_READ_LONG_ONCE
, "READ LONG (without retries)" },
2311 { ATA_CMD_WRITE_LONG
, "WRITE LONG (with retries)" },
2312 { ATA_CMD_WRITE_LONG_ONCE
, "WRITE LONG (without retries)" },
2313 { ATA_CMD_RESTORE
, "RECALIBRATE" },
2314 { 0, NULL
} /* terminate list */
2318 for (i
= 0; cmd_descr
[i
].text
; i
++)
2319 if (cmd_descr
[i
].command
== command
)
2320 return cmd_descr
[i
].text
;
2327 * ata_eh_link_report - report error handling to user
2328 * @link: ATA link EH is going on
2330 * Report EH to user.
2335 static void ata_eh_link_report(struct ata_link
*link
)
2337 struct ata_port
*ap
= link
->ap
;
2338 struct ata_eh_context
*ehc
= &link
->eh_context
;
2339 const char *frozen
, *desc
;
2341 int tag
, nr_failed
= 0;
2343 if (ehc
->i
.flags
& ATA_EHI_QUIET
)
2347 if (ehc
->i
.desc
[0] != '\0')
2350 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2351 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2353 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2354 ata_dev_phys_link(qc
->dev
) != link
||
2355 ((qc
->flags
& ATA_QCFLAG_QUIET
) &&
2356 qc
->err_mask
== AC_ERR_DEV
))
2358 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
&& !qc
->err_mask
)
2364 if (!nr_failed
&& !ehc
->i
.err_mask
)
2368 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2371 memset(tries_buf
, 0, sizeof(tries_buf
));
2372 if (ap
->eh_tries
< ATA_EH_MAX_TRIES
)
2373 snprintf(tries_buf
, sizeof(tries_buf
) - 1, " t%d",
2377 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "exception Emask 0x%x "
2378 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2379 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2380 ehc
->i
.action
, frozen
, tries_buf
);
2382 ata_dev_printk(ehc
->i
.dev
, KERN_ERR
, "%s\n", desc
);
2384 ata_link_printk(link
, KERN_ERR
, "exception Emask 0x%x "
2385 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2386 ehc
->i
.err_mask
, link
->sactive
, ehc
->i
.serror
,
2387 ehc
->i
.action
, frozen
, tries_buf
);
2389 ata_link_printk(link
, KERN_ERR
, "%s\n", desc
);
2392 #ifdef CONFIG_ATA_VERBOSE_ERROR
2394 ata_link_printk(link
, KERN_ERR
,
2395 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2396 ehc
->i
.serror
& SERR_DATA_RECOVERED
? "RecovData " : "",
2397 ehc
->i
.serror
& SERR_COMM_RECOVERED
? "RecovComm " : "",
2398 ehc
->i
.serror
& SERR_DATA
? "UnrecovData " : "",
2399 ehc
->i
.serror
& SERR_PERSISTENT
? "Persist " : "",
2400 ehc
->i
.serror
& SERR_PROTOCOL
? "Proto " : "",
2401 ehc
->i
.serror
& SERR_INTERNAL
? "HostInt " : "",
2402 ehc
->i
.serror
& SERR_PHYRDY_CHG
? "PHYRdyChg " : "",
2403 ehc
->i
.serror
& SERR_PHY_INT_ERR
? "PHYInt " : "",
2404 ehc
->i
.serror
& SERR_COMM_WAKE
? "CommWake " : "",
2405 ehc
->i
.serror
& SERR_10B_8B_ERR
? "10B8B " : "",
2406 ehc
->i
.serror
& SERR_DISPARITY
? "Dispar " : "",
2407 ehc
->i
.serror
& SERR_CRC
? "BadCRC " : "",
2408 ehc
->i
.serror
& SERR_HANDSHAKE
? "Handshk " : "",
2409 ehc
->i
.serror
& SERR_LINK_SEQ_ERR
? "LinkSeq " : "",
2410 ehc
->i
.serror
& SERR_TRANS_ST_ERROR
? "TrStaTrns " : "",
2411 ehc
->i
.serror
& SERR_UNRECOG_FIS
? "UnrecFIS " : "",
2412 ehc
->i
.serror
& SERR_DEV_XCHG
? "DevExch " : "");
2415 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
2416 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
2417 struct ata_taskfile
*cmd
= &qc
->tf
, *res
= &qc
->result_tf
;
2418 const u8
*cdb
= qc
->cdb
;
2419 char data_buf
[20] = "";
2420 char cdb_buf
[70] = "";
2422 if (!(qc
->flags
& ATA_QCFLAG_FAILED
) ||
2423 ata_dev_phys_link(qc
->dev
) != link
|| !qc
->err_mask
)
2426 if (qc
->dma_dir
!= DMA_NONE
) {
2427 static const char *dma_str
[] = {
2428 [DMA_BIDIRECTIONAL
] = "bidi",
2429 [DMA_TO_DEVICE
] = "out",
2430 [DMA_FROM_DEVICE
] = "in",
2432 static const char *prot_str
[] = {
2433 [ATA_PROT_PIO
] = "pio",
2434 [ATA_PROT_DMA
] = "dma",
2435 [ATA_PROT_NCQ
] = "ncq",
2436 [ATAPI_PROT_PIO
] = "pio",
2437 [ATAPI_PROT_DMA
] = "dma",
2440 snprintf(data_buf
, sizeof(data_buf
), " %s %u %s",
2441 prot_str
[qc
->tf
.protocol
], qc
->nbytes
,
2442 dma_str
[qc
->dma_dir
]);
2445 if (ata_is_atapi(qc
->tf
.protocol
)) {
2447 scsi_print_command(qc
->scsicmd
);
2449 snprintf(cdb_buf
, sizeof(cdb_buf
),
2450 "cdb %02x %02x %02x %02x %02x %02x %02x %02x "
2451 "%02x %02x %02x %02x %02x %02x %02x %02x\n ",
2452 cdb
[0], cdb
[1], cdb
[2], cdb
[3],
2453 cdb
[4], cdb
[5], cdb
[6], cdb
[7],
2454 cdb
[8], cdb
[9], cdb
[10], cdb
[11],
2455 cdb
[12], cdb
[13], cdb
[14], cdb
[15]);
2457 const char *descr
= ata_get_cmd_descript(cmd
->command
);
2459 ata_dev_printk(qc
->dev
, KERN_ERR
,
2460 "failed command: %s\n", descr
);
2463 ata_dev_printk(qc
->dev
, KERN_ERR
,
2464 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2466 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2467 "Emask 0x%x (%s)%s\n",
2468 cmd
->command
, cmd
->feature
, cmd
->nsect
,
2469 cmd
->lbal
, cmd
->lbam
, cmd
->lbah
,
2470 cmd
->hob_feature
, cmd
->hob_nsect
,
2471 cmd
->hob_lbal
, cmd
->hob_lbam
, cmd
->hob_lbah
,
2472 cmd
->device
, qc
->tag
, data_buf
, cdb_buf
,
2473 res
->command
, res
->feature
, res
->nsect
,
2474 res
->lbal
, res
->lbam
, res
->lbah
,
2475 res
->hob_feature
, res
->hob_nsect
,
2476 res
->hob_lbal
, res
->hob_lbam
, res
->hob_lbah
,
2477 res
->device
, qc
->err_mask
, ata_err_string(qc
->err_mask
),
2478 qc
->err_mask
& AC_ERR_NCQ
? " <F>" : "");
2480 #ifdef CONFIG_ATA_VERBOSE_ERROR
2481 if (res
->command
& (ATA_BUSY
| ATA_DRDY
| ATA_DF
| ATA_DRQ
|
2483 if (res
->command
& ATA_BUSY
)
2484 ata_dev_printk(qc
->dev
, KERN_ERR
,
2485 "status: { Busy }\n");
2487 ata_dev_printk(qc
->dev
, KERN_ERR
,
2488 "status: { %s%s%s%s}\n",
2489 res
->command
& ATA_DRDY
? "DRDY " : "",
2490 res
->command
& ATA_DF
? "DF " : "",
2491 res
->command
& ATA_DRQ
? "DRQ " : "",
2492 res
->command
& ATA_ERR
? "ERR " : "");
2495 if (cmd
->command
!= ATA_CMD_PACKET
&&
2496 (res
->feature
& (ATA_ICRC
| ATA_UNC
| ATA_IDNF
|
2498 ata_dev_printk(qc
->dev
, KERN_ERR
,
2499 "error: { %s%s%s%s}\n",
2500 res
->feature
& ATA_ICRC
? "ICRC " : "",
2501 res
->feature
& ATA_UNC
? "UNC " : "",
2502 res
->feature
& ATA_IDNF
? "IDNF " : "",
2503 res
->feature
& ATA_ABORTED
? "ABRT " : "");
2509 * ata_eh_report - report error handling to user
2510 * @ap: ATA port to report EH about
2512 * Report EH to user.
2517 void ata_eh_report(struct ata_port
*ap
)
2519 struct ata_link
*link
;
2521 ata_for_each_link(link
, ap
, HOST_FIRST
)
2522 ata_eh_link_report(link
);
2525 static int ata_do_reset(struct ata_link
*link
, ata_reset_fn_t reset
,
2526 unsigned int *classes
, unsigned long deadline
,
2529 struct ata_device
*dev
;
2532 ata_for_each_dev(dev
, link
, ALL
)
2533 classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
2535 return reset(link
, classes
, deadline
);
2538 static int ata_eh_followup_srst_needed(struct ata_link
*link
,
2539 int rc
, const unsigned int *classes
)
2541 if ((link
->flags
& ATA_LFLAG_NO_SRST
) || ata_link_offline(link
))
2545 if (sata_pmp_supported(link
->ap
) && ata_is_host_link(link
))
2550 int ata_eh_reset(struct ata_link
*link
, int classify
,
2551 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
2552 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
2554 struct ata_port
*ap
= link
->ap
;
2555 struct ata_link
*slave
= ap
->slave_link
;
2556 struct ata_eh_context
*ehc
= &link
->eh_context
;
2557 struct ata_eh_context
*sehc
= slave
? &slave
->eh_context
: NULL
;
2558 unsigned int *classes
= ehc
->classes
;
2559 unsigned int lflags
= link
->flags
;
2560 int verbose
= !(ehc
->i
.flags
& ATA_EHI_QUIET
);
2561 int max_tries
= 0, try = 0;
2562 struct ata_link
*failed_link
;
2563 struct ata_device
*dev
;
2564 unsigned long deadline
, now
;
2565 ata_reset_fn_t reset
;
2566 unsigned long flags
;
2573 while (ata_eh_reset_timeouts
[max_tries
] != ULONG_MAX
)
2575 if (link
->flags
& ATA_LFLAG_NO_HRST
)
2577 if (link
->flags
& ATA_LFLAG_NO_SRST
)
2580 /* make sure each reset attempt is at least COOL_DOWN apart */
2581 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
2583 WARN_ON(time_after(ehc
->last_reset
, now
));
2584 deadline
= ata_deadline(ehc
->last_reset
,
2585 ATA_EH_RESET_COOL_DOWN
);
2586 if (time_before(now
, deadline
))
2587 schedule_timeout_uninterruptible(deadline
- now
);
2590 spin_lock_irqsave(ap
->lock
, flags
);
2591 ap
->pflags
|= ATA_PFLAG_RESETTING
;
2592 spin_unlock_irqrestore(ap
->lock
, flags
);
2594 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2596 ata_for_each_dev(dev
, link
, ALL
) {
2597 /* If we issue an SRST then an ATA drive (not ATAPI)
2598 * may change configuration and be in PIO0 timing. If
2599 * we do a hard reset (or are coming from power on)
2600 * this is true for ATA or ATAPI. Until we've set a
2601 * suitable controller mode we should not touch the
2602 * bus as we may be talking too fast.
2604 dev
->pio_mode
= XFER_PIO_0
;
2606 /* If the controller has a pio mode setup function
2607 * then use it to set the chipset to rights. Don't
2608 * touch the DMA setup as that will be dealt with when
2609 * configuring devices.
2611 if (ap
->ops
->set_piomode
)
2612 ap
->ops
->set_piomode(ap
, dev
);
2615 /* prefer hardreset */
2617 ehc
->i
.action
&= ~ATA_EH_RESET
;
2620 ehc
->i
.action
|= ATA_EH_HARDRESET
;
2621 } else if (softreset
) {
2623 ehc
->i
.action
|= ATA_EH_SOFTRESET
;
2627 unsigned long deadline
= ata_deadline(jiffies
,
2628 ATA_EH_PRERESET_TIMEOUT
);
2631 sehc
->i
.action
&= ~ATA_EH_RESET
;
2632 sehc
->i
.action
|= ehc
->i
.action
;
2635 rc
= prereset(link
, deadline
);
2637 /* If present, do prereset on slave link too. Reset
2638 * is skipped iff both master and slave links report
2639 * -ENOENT or clear ATA_EH_RESET.
2641 if (slave
&& (rc
== 0 || rc
== -ENOENT
)) {
2644 tmp
= prereset(slave
, deadline
);
2648 ehc
->i
.action
|= sehc
->i
.action
;
2652 if (rc
== -ENOENT
) {
2653 ata_link_printk(link
, KERN_DEBUG
,
2654 "port disabled. ignoring.\n");
2655 ehc
->i
.action
&= ~ATA_EH_RESET
;
2657 ata_for_each_dev(dev
, link
, ALL
)
2658 classes
[dev
->devno
] = ATA_DEV_NONE
;
2662 ata_link_printk(link
, KERN_ERR
,
2663 "prereset failed (errno=%d)\n", rc
);
2667 /* prereset() might have cleared ATA_EH_RESET. If so,
2668 * bang classes, thaw and return.
2670 if (reset
&& !(ehc
->i
.action
& ATA_EH_RESET
)) {
2671 ata_for_each_dev(dev
, link
, ALL
)
2672 classes
[dev
->devno
] = ATA_DEV_NONE
;
2673 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) &&
2674 ata_is_host_link(link
))
2675 ata_eh_thaw_port(ap
);
2685 if (ata_is_host_link(link
))
2686 ata_eh_freeze_port(ap
);
2688 deadline
= ata_deadline(jiffies
, ata_eh_reset_timeouts
[try++]);
2692 ata_link_printk(link
, KERN_INFO
, "%s resetting link\n",
2693 reset
== softreset
? "soft" : "hard");
2695 /* mark that this EH session started with reset */
2696 ehc
->last_reset
= jiffies
;
2697 if (reset
== hardreset
)
2698 ehc
->i
.flags
|= ATA_EHI_DID_HARDRESET
;
2700 ehc
->i
.flags
|= ATA_EHI_DID_SOFTRESET
;
2702 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2703 if (rc
&& rc
!= -EAGAIN
) {
2708 /* hardreset slave link if existent */
2709 if (slave
&& reset
== hardreset
) {
2713 ata_link_printk(slave
, KERN_INFO
,
2714 "hard resetting link\n");
2716 ata_eh_about_to_do(slave
, NULL
, ATA_EH_RESET
);
2717 tmp
= ata_do_reset(slave
, reset
, classes
, deadline
,
2725 failed_link
= slave
;
2731 /* perform follow-up SRST if necessary */
2732 if (reset
== hardreset
&&
2733 ata_eh_followup_srst_needed(link
, rc
, classes
)) {
2737 ata_link_printk(link
, KERN_ERR
,
2738 "follow-up softreset required "
2739 "but no softreset available\n");
2745 ata_eh_about_to_do(link
, NULL
, ATA_EH_RESET
);
2746 rc
= ata_do_reset(link
, reset
, classes
, deadline
, true);
2754 ata_link_printk(link
, KERN_INFO
, "no reset method "
2755 "available, skipping reset\n");
2756 if (!(lflags
& ATA_LFLAG_ASSUME_CLASS
))
2757 lflags
|= ATA_LFLAG_ASSUME_ATA
;
2761 * Post-reset processing
2763 ata_for_each_dev(dev
, link
, ALL
) {
2764 /* After the reset, the device state is PIO 0 and the
2765 * controller state is undefined. Reset also wakes up
2766 * drives from sleeping mode.
2768 dev
->pio_mode
= XFER_PIO_0
;
2769 dev
->flags
&= ~ATA_DFLAG_SLEEPING
;
2771 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
2774 /* apply class override */
2775 if (lflags
& ATA_LFLAG_ASSUME_ATA
)
2776 classes
[dev
->devno
] = ATA_DEV_ATA
;
2777 else if (lflags
& ATA_LFLAG_ASSUME_SEMB
)
2778 classes
[dev
->devno
] = ATA_DEV_SEMB_UNSUP
;
2781 /* record current link speed */
2782 if (sata_scr_read(link
, SCR_STATUS
, &sstatus
) == 0)
2783 link
->sata_spd
= (sstatus
>> 4) & 0xf;
2784 if (slave
&& sata_scr_read(slave
, SCR_STATUS
, &sstatus
) == 0)
2785 slave
->sata_spd
= (sstatus
>> 4) & 0xf;
2788 if (ata_is_host_link(link
))
2789 ata_eh_thaw_port(ap
);
2791 /* postreset() should clear hardware SError. Although SError
2792 * is cleared during link resume, clearing SError here is
2793 * necessary as some PHYs raise hotplug events after SRST.
2794 * This introduces race condition where hotplug occurs between
2795 * reset and here. This race is mediated by cross checking
2796 * link onlineness and classification result later.
2799 postreset(link
, classes
);
2801 postreset(slave
, classes
);
2805 * Some controllers can't be frozen very well and may set spurious
2806 * error conditions during reset. Clear accumulated error
2807 * information and re-thaw the port if frozen. As reset is the
2808 * final recovery action and we cross check link onlineness against
2809 * device classification later, no hotplug event is lost by this.
2811 spin_lock_irqsave(link
->ap
->lock
, flags
);
2812 memset(&link
->eh_info
, 0, sizeof(link
->eh_info
));
2814 memset(&slave
->eh_info
, 0, sizeof(link
->eh_info
));
2815 ap
->pflags
&= ~ATA_PFLAG_EH_PENDING
;
2816 spin_unlock_irqrestore(link
->ap
->lock
, flags
);
2818 if (ap
->pflags
& ATA_PFLAG_FROZEN
)
2819 ata_eh_thaw_port(ap
);
2822 * Make sure onlineness and classification result correspond.
2823 * Hotplug could have happened during reset and some
2824 * controllers fail to wait while a drive is spinning up after
2825 * being hotplugged causing misdetection. By cross checking
2826 * link on/offlineness and classification result, those
2827 * conditions can be reliably detected and retried.
2830 ata_for_each_dev(dev
, link
, ALL
) {
2831 if (ata_phys_link_online(ata_dev_phys_link(dev
))) {
2832 if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
2833 ata_dev_printk(dev
, KERN_DEBUG
, "link online "
2834 "but device misclassifed\n");
2835 classes
[dev
->devno
] = ATA_DEV_NONE
;
2838 } else if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
2839 if (ata_class_enabled(classes
[dev
->devno
]))
2840 ata_dev_printk(dev
, KERN_DEBUG
, "link offline, "
2841 "clearing class %d to NONE\n",
2842 classes
[dev
->devno
]);
2843 classes
[dev
->devno
] = ATA_DEV_NONE
;
2844 } else if (classes
[dev
->devno
] == ATA_DEV_UNKNOWN
) {
2845 ata_dev_printk(dev
, KERN_DEBUG
, "link status unknown, "
2846 "clearing UNKNOWN to NONE\n");
2847 classes
[dev
->devno
] = ATA_DEV_NONE
;
2851 if (classify
&& nr_unknown
) {
2852 if (try < max_tries
) {
2853 ata_link_printk(link
, KERN_WARNING
, "link online but "
2854 "%d devices misclassified, retrying\n",
2860 ata_link_printk(link
, KERN_WARNING
,
2861 "link online but %d devices misclassified, "
2862 "device detection might fail\n", nr_unknown
);
2865 /* reset successful, schedule revalidation */
2866 ata_eh_done(link
, NULL
, ATA_EH_RESET
);
2868 ata_eh_done(slave
, NULL
, ATA_EH_RESET
);
2869 ehc
->last_reset
= jiffies
; /* update to completion time */
2870 ehc
->i
.action
|= ATA_EH_REVALIDATE
;
2871 link
->lpm_policy
= ATA_LPM_UNKNOWN
; /* reset LPM state */
2875 /* clear hotplug flag */
2876 ehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2878 sehc
->i
.flags
&= ~ATA_EHI_HOTPLUGGED
;
2880 spin_lock_irqsave(ap
->lock
, flags
);
2881 ap
->pflags
&= ~ATA_PFLAG_RESETTING
;
2882 spin_unlock_irqrestore(ap
->lock
, flags
);
2887 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2888 if (!ata_is_host_link(link
) &&
2889 sata_scr_read(link
, SCR_STATUS
, &sstatus
))
2892 if (rc
== -ERESTART
|| try >= max_tries
)
2896 if (time_before(now
, deadline
)) {
2897 unsigned long delta
= deadline
- now
;
2899 ata_link_printk(failed_link
, KERN_WARNING
,
2900 "reset failed (errno=%d), retrying in %u secs\n",
2901 rc
, DIV_ROUND_UP(jiffies_to_msecs(delta
), 1000));
2905 delta
= schedule_timeout_uninterruptible(delta
);
2909 if (try == max_tries
- 1) {
2910 sata_down_spd_limit(link
, 0);
2912 sata_down_spd_limit(slave
, 0);
2913 } else if (rc
== -EPIPE
)
2914 sata_down_spd_limit(failed_link
, 0);
2921 static inline void ata_eh_pull_park_action(struct ata_port
*ap
)
2923 struct ata_link
*link
;
2924 struct ata_device
*dev
;
2925 unsigned long flags
;
2928 * This function can be thought of as an extended version of
2929 * ata_eh_about_to_do() specially crafted to accommodate the
2930 * requirements of ATA_EH_PARK handling. Since the EH thread
2931 * does not leave the do {} while () loop in ata_eh_recover as
2932 * long as the timeout for a park request to *one* device on
2933 * the port has not expired, and since we still want to pick
2934 * up park requests to other devices on the same port or
2935 * timeout updates for the same device, we have to pull
2936 * ATA_EH_PARK actions from eh_info into eh_context.i
2937 * ourselves at the beginning of each pass over the loop.
2939 * Additionally, all write accesses to &ap->park_req_pending
2940 * through INIT_COMPLETION() (see below) or complete_all()
2941 * (see ata_scsi_park_store()) are protected by the host lock.
2942 * As a result we have that park_req_pending.done is zero on
2943 * exit from this function, i.e. when ATA_EH_PARK actions for
2944 * *all* devices on port ap have been pulled into the
2945 * respective eh_context structs. If, and only if,
2946 * park_req_pending.done is non-zero by the time we reach
2947 * wait_for_completion_timeout(), another ATA_EH_PARK action
2948 * has been scheduled for at least one of the devices on port
2949 * ap and we have to cycle over the do {} while () loop in
2950 * ata_eh_recover() again.
2953 spin_lock_irqsave(ap
->lock
, flags
);
2954 INIT_COMPLETION(ap
->park_req_pending
);
2955 ata_for_each_link(link
, ap
, EDGE
) {
2956 ata_for_each_dev(dev
, link
, ALL
) {
2957 struct ata_eh_info
*ehi
= &link
->eh_info
;
2959 link
->eh_context
.i
.dev_action
[dev
->devno
] |=
2960 ehi
->dev_action
[dev
->devno
] & ATA_EH_PARK
;
2961 ata_eh_clear_action(link
, dev
, ehi
, ATA_EH_PARK
);
2964 spin_unlock_irqrestore(ap
->lock
, flags
);
2967 static void ata_eh_park_issue_cmd(struct ata_device
*dev
, int park
)
2969 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
2970 struct ata_taskfile tf
;
2971 unsigned int err_mask
;
2973 ata_tf_init(dev
, &tf
);
2975 ehc
->unloaded_mask
|= 1 << dev
->devno
;
2976 tf
.command
= ATA_CMD_IDLEIMMEDIATE
;
2982 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
2983 tf
.command
= ATA_CMD_CHK_POWER
;
2986 tf
.flags
|= ATA_TFLAG_DEVICE
| ATA_TFLAG_ISADDR
;
2987 tf
.protocol
|= ATA_PROT_NODATA
;
2988 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
2989 if (park
&& (err_mask
|| tf
.lbal
!= 0xc4)) {
2990 ata_dev_printk(dev
, KERN_ERR
, "head unload failed!\n");
2991 ehc
->unloaded_mask
&= ~(1 << dev
->devno
);
2995 static int ata_eh_revalidate_and_attach(struct ata_link
*link
,
2996 struct ata_device
**r_failed_dev
)
2998 struct ata_port
*ap
= link
->ap
;
2999 struct ata_eh_context
*ehc
= &link
->eh_context
;
3000 struct ata_device
*dev
;
3001 unsigned int new_mask
= 0;
3002 unsigned long flags
;
3007 /* For PATA drive side cable detection to work, IDENTIFY must
3008 * be done backwards such that PDIAG- is released by the slave
3009 * device before the master device is identified.
3011 ata_for_each_dev(dev
, link
, ALL_REVERSE
) {
3012 unsigned int action
= ata_eh_dev_action(dev
);
3013 unsigned int readid_flags
= 0;
3015 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
)
3016 readid_flags
|= ATA_READID_POSTRESET
;
3018 if ((action
& ATA_EH_REVALIDATE
) && ata_dev_enabled(dev
)) {
3019 WARN_ON(dev
->class == ATA_DEV_PMP
);
3021 if (ata_phys_link_offline(ata_dev_phys_link(dev
))) {
3026 ata_eh_about_to_do(link
, dev
, ATA_EH_REVALIDATE
);
3027 rc
= ata_dev_revalidate(dev
, ehc
->classes
[dev
->devno
],
3032 ata_eh_done(link
, dev
, ATA_EH_REVALIDATE
);
3034 /* Configuration may have changed, reconfigure
3037 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
3039 /* schedule the scsi_rescan_device() here */
3040 schedule_work(&(ap
->scsi_rescan_task
));
3041 } else if (dev
->class == ATA_DEV_UNKNOWN
&&
3042 ehc
->tries
[dev
->devno
] &&
3043 ata_class_enabled(ehc
->classes
[dev
->devno
])) {
3044 /* Temporarily set dev->class, it will be
3045 * permanently set once all configurations are
3046 * complete. This is necessary because new
3047 * device configuration is done in two
3050 dev
->class = ehc
->classes
[dev
->devno
];
3052 if (dev
->class == ATA_DEV_PMP
)
3053 rc
= sata_pmp_attach(dev
);
3055 rc
= ata_dev_read_id(dev
, &dev
->class,
3056 readid_flags
, dev
->id
);
3058 /* read_id might have changed class, store and reset */
3059 ehc
->classes
[dev
->devno
] = dev
->class;
3060 dev
->class = ATA_DEV_UNKNOWN
;
3064 /* clear error info accumulated during probe */
3065 ata_ering_clear(&dev
->ering
);
3066 new_mask
|= 1 << dev
->devno
;
3069 /* IDENTIFY was issued to non-existent
3070 * device. No need to reset. Just
3071 * thaw and ignore the device.
3073 ata_eh_thaw_port(ap
);
3081 /* PDIAG- should have been released, ask cable type if post-reset */
3082 if ((ehc
->i
.flags
& ATA_EHI_DID_RESET
) && ata_is_host_link(link
)) {
3083 if (ap
->ops
->cable_detect
)
3084 ap
->cbl
= ap
->ops
->cable_detect(ap
);
3088 /* Configure new devices forward such that user doesn't see
3089 * device detection messages backwards.
3091 ata_for_each_dev(dev
, link
, ALL
) {
3092 if (!(new_mask
& (1 << dev
->devno
)))
3095 dev
->class = ehc
->classes
[dev
->devno
];
3097 if (dev
->class == ATA_DEV_PMP
)
3100 ehc
->i
.flags
|= ATA_EHI_PRINTINFO
;
3101 rc
= ata_dev_configure(dev
);
3102 ehc
->i
.flags
&= ~ATA_EHI_PRINTINFO
;
3104 dev
->class = ATA_DEV_UNKNOWN
;
3108 spin_lock_irqsave(ap
->lock
, flags
);
3109 ap
->pflags
|= ATA_PFLAG_SCSI_HOTPLUG
;
3110 spin_unlock_irqrestore(ap
->lock
, flags
);
3112 /* new device discovered, configure xfermode */
3113 ehc
->i
.flags
|= ATA_EHI_SETMODE
;
3119 *r_failed_dev
= dev
;
3120 DPRINTK("EXIT rc=%d\n", rc
);
3125 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3126 * @link: link on which timings will be programmed
3127 * @r_failed_dev: out parameter for failed device
3129 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3130 * ata_set_mode() fails, pointer to the failing device is
3131 * returned in @r_failed_dev.
3134 * PCI/etc. bus probe sem.
3137 * 0 on success, negative errno otherwise
3139 int ata_set_mode(struct ata_link
*link
, struct ata_device
**r_failed_dev
)
3141 struct ata_port
*ap
= link
->ap
;
3142 struct ata_device
*dev
;
3145 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
3146 ata_for_each_dev(dev
, link
, ENABLED
) {
3147 if (!(dev
->flags
& ATA_DFLAG_DUBIOUS_XFER
)) {
3148 struct ata_ering_entry
*ent
;
3150 ent
= ata_ering_top(&dev
->ering
);
3152 ent
->eflags
&= ~ATA_EFLAG_DUBIOUS_XFER
;
3156 /* has private set_mode? */
3157 if (ap
->ops
->set_mode
)
3158 rc
= ap
->ops
->set_mode(link
, r_failed_dev
);
3160 rc
= ata_do_set_mode(link
, r_failed_dev
);
3162 /* if transfer mode has changed, set DUBIOUS_XFER on device */
3163 ata_for_each_dev(dev
, link
, ENABLED
) {
3164 struct ata_eh_context
*ehc
= &link
->eh_context
;
3165 u8 saved_xfer_mode
= ehc
->saved_xfer_mode
[dev
->devno
];
3166 u8 saved_ncq
= !!(ehc
->saved_ncq_enabled
& (1 << dev
->devno
));
3168 if (dev
->xfer_mode
!= saved_xfer_mode
||
3169 ata_ncq_enabled(dev
) != saved_ncq
)
3170 dev
->flags
|= ATA_DFLAG_DUBIOUS_XFER
;
3177 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3178 * @dev: ATAPI device to clear UA for
3180 * Resets and other operations can make an ATAPI device raise
3181 * UNIT ATTENTION which causes the next operation to fail. This
3182 * function clears UA.
3185 * EH context (may sleep).
3188 * 0 on success, -errno on failure.
3190 static int atapi_eh_clear_ua(struct ata_device
*dev
)
3194 for (i
= 0; i
< ATA_EH_UA_TRIES
; i
++) {
3195 u8
*sense_buffer
= dev
->link
->ap
->sector_buf
;
3197 unsigned int err_mask
;
3199 err_mask
= atapi_eh_tur(dev
, &sense_key
);
3200 if (err_mask
!= 0 && err_mask
!= AC_ERR_DEV
) {
3201 ata_dev_printk(dev
, KERN_WARNING
, "TEST_UNIT_READY "
3202 "failed (err_mask=0x%x)\n", err_mask
);
3206 if (!err_mask
|| sense_key
!= UNIT_ATTENTION
)
3209 err_mask
= atapi_eh_request_sense(dev
, sense_buffer
, sense_key
);
3211 ata_dev_printk(dev
, KERN_WARNING
, "failed to clear "
3212 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask
);
3217 ata_dev_printk(dev
, KERN_WARNING
,
3218 "UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES
);
3224 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3225 * @dev: ATA device which may need FLUSH retry
3227 * If @dev failed FLUSH, it needs to be reported upper layer
3228 * immediately as it means that @dev failed to remap and already
3229 * lost at least a sector and further FLUSH retrials won't make
3230 * any difference to the lost sector. However, if FLUSH failed
3231 * for other reasons, for example transmission error, FLUSH needs
3234 * This function determines whether FLUSH failure retry is
3235 * necessary and performs it if so.
3238 * 0 if EH can continue, -errno if EH needs to be repeated.
3240 static int ata_eh_maybe_retry_flush(struct ata_device
*dev
)
3242 struct ata_link
*link
= dev
->link
;
3243 struct ata_port
*ap
= link
->ap
;
3244 struct ata_queued_cmd
*qc
;
3245 struct ata_taskfile tf
;
3246 unsigned int err_mask
;
3249 /* did flush fail for this device? */
3250 if (!ata_tag_valid(link
->active_tag
))
3253 qc
= __ata_qc_from_tag(ap
, link
->active_tag
);
3254 if (qc
->dev
!= dev
|| (qc
->tf
.command
!= ATA_CMD_FLUSH_EXT
&&
3255 qc
->tf
.command
!= ATA_CMD_FLUSH
))
3258 /* if the device failed it, it should be reported to upper layers */
3259 if (qc
->err_mask
& AC_ERR_DEV
)
3262 /* flush failed for some other reason, give it another shot */
3263 ata_tf_init(dev
, &tf
);
3265 tf
.command
= qc
->tf
.command
;
3266 tf
.flags
|= ATA_TFLAG_DEVICE
;
3267 tf
.protocol
= ATA_PROT_NODATA
;
3269 ata_dev_printk(dev
, KERN_WARNING
, "retrying FLUSH 0x%x Emask 0x%x\n",
3270 tf
.command
, qc
->err_mask
);
3272 err_mask
= ata_exec_internal(dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0, 0);
3275 * FLUSH is complete but there's no way to
3276 * successfully complete a failed command from EH.
3277 * Making sure retry is allowed at least once and
3278 * retrying it should do the trick - whatever was in
3279 * the cache is already on the platter and this won't
3280 * cause infinite loop.
3282 qc
->scsicmd
->allowed
= max(qc
->scsicmd
->allowed
, 1);
3284 ata_dev_printk(dev
, KERN_WARNING
, "FLUSH failed Emask 0x%x\n",
3288 /* if device failed it, report it to upper layers */
3289 if (err_mask
& AC_ERR_DEV
) {
3290 qc
->err_mask
|= AC_ERR_DEV
;
3292 if (!(ap
->pflags
& ATA_PFLAG_FROZEN
))
3300 * ata_eh_set_lpm - configure SATA interface power management
3301 * @link: link to configure power management
3302 * @policy: the link power management policy
3303 * @r_failed_dev: out parameter for failed device
3305 * Enable SATA Interface power management. This will enable
3306 * Device Interface Power Management (DIPM) for min_power
3307 * policy, and then call driver specific callbacks for
3308 * enabling Host Initiated Power management.
3314 * 0 on success, -errno on failure.
3316 static int ata_eh_set_lpm(struct ata_link
*link
, enum ata_lpm_policy policy
,
3317 struct ata_device
**r_failed_dev
)
3319 struct ata_port
*ap
= ata_is_host_link(link
) ? link
->ap
: NULL
;
3320 struct ata_eh_context
*ehc
= &link
->eh_context
;
3321 struct ata_device
*dev
, *link_dev
= NULL
, *lpm_dev
= NULL
;
3322 enum ata_lpm_policy old_policy
= link
->lpm_policy
;
3323 bool no_dipm
= link
->ap
->flags
& ATA_FLAG_NO_DIPM
;
3324 unsigned int hints
= ATA_LPM_EMPTY
| ATA_LPM_HIPM
;
3325 unsigned int err_mask
;
3328 /* if the link or host doesn't do LPM, noop */
3329 if ((link
->flags
& ATA_LFLAG_NO_LPM
) || (ap
&& !ap
->ops
->set_lpm
))
3333 * DIPM is enabled only for MIN_POWER as some devices
3334 * misbehave when the host NACKs transition to SLUMBER. Order
3335 * device and link configurations such that the host always
3336 * allows DIPM requests.
3338 ata_for_each_dev(dev
, link
, ENABLED
) {
3339 bool hipm
= ata_id_has_hipm(dev
->id
);
3340 bool dipm
= ata_id_has_dipm(dev
->id
) && !no_dipm
;
3342 /* find the first enabled and LPM enabled devices */
3346 if (!lpm_dev
&& (hipm
|| dipm
))
3349 hints
&= ~ATA_LPM_EMPTY
;
3351 hints
&= ~ATA_LPM_HIPM
;
3353 /* disable DIPM before changing link config */
3354 if (policy
!= ATA_LPM_MIN_POWER
&& dipm
) {
3355 err_mask
= ata_dev_set_feature(dev
,
3356 SETFEATURES_SATA_DISABLE
, SATA_DIPM
);
3357 if (err_mask
&& err_mask
!= AC_ERR_DEV
) {
3358 ata_dev_printk(dev
, KERN_WARNING
,
3359 "failed to disable DIPM, Emask 0x%x\n",
3368 rc
= ap
->ops
->set_lpm(link
, policy
, hints
);
3369 if (!rc
&& ap
->slave_link
)
3370 rc
= ap
->ops
->set_lpm(ap
->slave_link
, policy
, hints
);
3372 rc
= sata_pmp_set_lpm(link
, policy
, hints
);
3375 * Attribute link config failure to the first (LPM) enabled
3376 * device on the link.
3379 if (rc
== -EOPNOTSUPP
) {
3380 link
->flags
|= ATA_LFLAG_NO_LPM
;
3383 dev
= lpm_dev
? lpm_dev
: link_dev
;
3388 * Low level driver acked the transition. Issue DIPM command
3389 * with the new policy set.
3391 link
->lpm_policy
= policy
;
3392 if (ap
&& ap
->slave_link
)
3393 ap
->slave_link
->lpm_policy
= policy
;
3395 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3396 ata_for_each_dev(dev
, link
, ENABLED
) {
3397 if (policy
== ATA_LPM_MIN_POWER
&& !no_dipm
&&
3398 ata_id_has_dipm(dev
->id
)) {
3399 err_mask
= ata_dev_set_feature(dev
,
3400 SETFEATURES_SATA_ENABLE
, SATA_DIPM
);
3401 if (err_mask
&& err_mask
!= AC_ERR_DEV
) {
3402 ata_dev_printk(dev
, KERN_WARNING
,
3403 "failed to enable DIPM, Emask 0x%x\n",
3414 /* restore the old policy */
3415 link
->lpm_policy
= old_policy
;
3416 if (ap
&& ap
->slave_link
)
3417 ap
->slave_link
->lpm_policy
= old_policy
;
3419 /* if no device or only one more chance is left, disable LPM */
3420 if (!dev
|| ehc
->tries
[dev
->devno
] <= 2) {
3421 ata_link_printk(link
, KERN_WARNING
,
3422 "disabling LPM on the link\n");
3423 link
->flags
|= ATA_LFLAG_NO_LPM
;
3426 *r_failed_dev
= dev
;
3430 int ata_link_nr_enabled(struct ata_link
*link
)
3432 struct ata_device
*dev
;
3435 ata_for_each_dev(dev
, link
, ENABLED
)
3440 static int ata_link_nr_vacant(struct ata_link
*link
)
3442 struct ata_device
*dev
;
3445 ata_for_each_dev(dev
, link
, ALL
)
3446 if (dev
->class == ATA_DEV_UNKNOWN
)
3451 static int ata_eh_skip_recovery(struct ata_link
*link
)
3453 struct ata_port
*ap
= link
->ap
;
3454 struct ata_eh_context
*ehc
= &link
->eh_context
;
3455 struct ata_device
*dev
;
3457 /* skip disabled links */
3458 if (link
->flags
& ATA_LFLAG_DISABLED
)
3461 /* skip if explicitly requested */
3462 if (ehc
->i
.flags
& ATA_EHI_NO_RECOVERY
)
3465 /* thaw frozen port and recover failed devices */
3466 if ((ap
->pflags
& ATA_PFLAG_FROZEN
) || ata_link_nr_enabled(link
))
3469 /* reset at least once if reset is requested */
3470 if ((ehc
->i
.action
& ATA_EH_RESET
) &&
3471 !(ehc
->i
.flags
& ATA_EHI_DID_RESET
))
3474 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
3475 ata_for_each_dev(dev
, link
, ALL
) {
3476 if (dev
->class == ATA_DEV_UNKNOWN
&&
3477 ehc
->classes
[dev
->devno
] != ATA_DEV_NONE
)
3484 static int ata_count_probe_trials_cb(struct ata_ering_entry
*ent
, void *void_arg
)
3486 u64 interval
= msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL
);
3487 u64 now
= get_jiffies_64();
3488 int *trials
= void_arg
;
3490 if ((ent
->eflags
& ATA_EFLAG_OLD_ER
) ||
3491 (ent
->timestamp
< now
- min(now
, interval
)))
3498 static int ata_eh_schedule_probe(struct ata_device
*dev
)
3500 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3501 struct ata_link
*link
= ata_dev_phys_link(dev
);
3504 if (!(ehc
->i
.probe_mask
& (1 << dev
->devno
)) ||
3505 (ehc
->did_probe_mask
& (1 << dev
->devno
)))
3508 ata_eh_detach_dev(dev
);
3510 ehc
->did_probe_mask
|= (1 << dev
->devno
);
3511 ehc
->i
.action
|= ATA_EH_RESET
;
3512 ehc
->saved_xfer_mode
[dev
->devno
] = 0;
3513 ehc
->saved_ncq_enabled
&= ~(1 << dev
->devno
);
3515 /* the link maybe in a deep sleep, wake it up */
3516 if (link
->lpm_policy
> ATA_LPM_MAX_POWER
) {
3517 if (ata_is_host_link(link
))
3518 link
->ap
->ops
->set_lpm(link
, ATA_LPM_MAX_POWER
,
3521 sata_pmp_set_lpm(link
, ATA_LPM_MAX_POWER
,
3525 /* Record and count probe trials on the ering. The specific
3526 * error mask used is irrelevant. Because a successful device
3527 * detection clears the ering, this count accumulates only if
3528 * there are consecutive failed probes.
3530 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3531 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3532 * forced to 1.5Gbps.
3534 * This is to work around cases where failed link speed
3535 * negotiation results in device misdetection leading to
3536 * infinite DEVXCHG or PHRDY CHG events.
3538 ata_ering_record(&dev
->ering
, 0, AC_ERR_OTHER
);
3539 ata_ering_map(&dev
->ering
, ata_count_probe_trials_cb
, &trials
);
3541 if (trials
> ATA_EH_PROBE_TRIALS
)
3542 sata_down_spd_limit(link
, 1);
3547 static int ata_eh_handle_dev_fail(struct ata_device
*dev
, int err
)
3549 struct ata_eh_context
*ehc
= &dev
->link
->eh_context
;
3551 /* -EAGAIN from EH routine indicates retry without prejudice.
3552 * The requester is responsible for ensuring forward progress.
3555 ehc
->tries
[dev
->devno
]--;
3559 /* device missing or wrong IDENTIFY data, schedule probing */
3560 ehc
->i
.probe_mask
|= (1 << dev
->devno
);
3562 /* give it just one more chance */
3563 ehc
->tries
[dev
->devno
] = min(ehc
->tries
[dev
->devno
], 1);
3565 if (ehc
->tries
[dev
->devno
] == 1) {
3566 /* This is the last chance, better to slow
3567 * down than lose it.
3569 sata_down_spd_limit(ata_dev_phys_link(dev
), 0);
3570 if (dev
->pio_mode
> XFER_PIO_0
)
3571 ata_down_xfermask_limit(dev
, ATA_DNXFER_PIO
);
3575 if (ata_dev_enabled(dev
) && !ehc
->tries
[dev
->devno
]) {
3576 /* disable device if it has used up all its chances */
3577 ata_dev_disable(dev
);
3579 /* detach if offline */
3580 if (ata_phys_link_offline(ata_dev_phys_link(dev
)))
3581 ata_eh_detach_dev(dev
);
3583 /* schedule probe if necessary */
3584 if (ata_eh_schedule_probe(dev
)) {
3585 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3586 memset(ehc
->cmd_timeout_idx
[dev
->devno
], 0,
3587 sizeof(ehc
->cmd_timeout_idx
[dev
->devno
]));
3592 ehc
->i
.action
|= ATA_EH_RESET
;
3598 * ata_eh_recover - recover host port after error
3599 * @ap: host port to recover
3600 * @prereset: prereset method (can be NULL)
3601 * @softreset: softreset method (can be NULL)
3602 * @hardreset: hardreset method (can be NULL)
3603 * @postreset: postreset method (can be NULL)
3604 * @r_failed_link: out parameter for failed link
3606 * This is the alpha and omega, eum and yang, heart and soul of
3607 * libata exception handling. On entry, actions required to
3608 * recover each link and hotplug requests are recorded in the
3609 * link's eh_context. This function executes all the operations
3610 * with appropriate retrials and fallbacks to resurrect failed
3611 * devices, detach goners and greet newcomers.
3614 * Kernel thread context (may sleep).
3617 * 0 on success, -errno on failure.
3619 int ata_eh_recover(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3620 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3621 ata_postreset_fn_t postreset
,
3622 struct ata_link
**r_failed_link
)
3624 struct ata_link
*link
;
3625 struct ata_device
*dev
;
3627 unsigned long flags
, deadline
;
3631 /* prep for recovery */
3632 ata_for_each_link(link
, ap
, EDGE
) {
3633 struct ata_eh_context
*ehc
= &link
->eh_context
;
3635 /* re-enable link? */
3636 if (ehc
->i
.action
& ATA_EH_ENABLE_LINK
) {
3637 ata_eh_about_to_do(link
, NULL
, ATA_EH_ENABLE_LINK
);
3638 spin_lock_irqsave(ap
->lock
, flags
);
3639 link
->flags
&= ~ATA_LFLAG_DISABLED
;
3640 spin_unlock_irqrestore(ap
->lock
, flags
);
3641 ata_eh_done(link
, NULL
, ATA_EH_ENABLE_LINK
);
3644 ata_for_each_dev(dev
, link
, ALL
) {
3645 if (link
->flags
& ATA_LFLAG_NO_RETRY
)
3646 ehc
->tries
[dev
->devno
] = 1;
3648 ehc
->tries
[dev
->devno
] = ATA_EH_DEV_TRIES
;
3650 /* collect port action mask recorded in dev actions */
3651 ehc
->i
.action
|= ehc
->i
.dev_action
[dev
->devno
] &
3652 ~ATA_EH_PERDEV_MASK
;
3653 ehc
->i
.dev_action
[dev
->devno
] &= ATA_EH_PERDEV_MASK
;
3655 /* process hotplug request */
3656 if (dev
->flags
& ATA_DFLAG_DETACH
)
3657 ata_eh_detach_dev(dev
);
3659 /* schedule probe if necessary */
3660 if (!ata_dev_enabled(dev
))
3661 ata_eh_schedule_probe(dev
);
3668 /* if UNLOADING, finish immediately */
3669 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
3673 ata_for_each_link(link
, ap
, EDGE
) {
3674 struct ata_eh_context
*ehc
= &link
->eh_context
;
3676 /* skip EH if possible. */
3677 if (ata_eh_skip_recovery(link
))
3680 ata_for_each_dev(dev
, link
, ALL
)
3681 ehc
->classes
[dev
->devno
] = ATA_DEV_UNKNOWN
;
3685 ata_for_each_link(link
, ap
, EDGE
) {
3686 struct ata_eh_context
*ehc
= &link
->eh_context
;
3688 if (!(ehc
->i
.action
& ATA_EH_RESET
))
3691 rc
= ata_eh_reset(link
, ata_link_nr_vacant(link
),
3692 prereset
, softreset
, hardreset
, postreset
);
3694 ata_link_printk(link
, KERN_ERR
,
3695 "reset failed, giving up\n");
3704 * clears ATA_EH_PARK in eh_info and resets
3705 * ap->park_req_pending
3707 ata_eh_pull_park_action(ap
);
3710 ata_for_each_link(link
, ap
, EDGE
) {
3711 ata_for_each_dev(dev
, link
, ALL
) {
3712 struct ata_eh_context
*ehc
= &link
->eh_context
;
3715 if (dev
->class != ATA_DEV_ATA
)
3717 if (!(ehc
->i
.dev_action
[dev
->devno
] &
3720 tmp
= dev
->unpark_deadline
;
3721 if (time_before(deadline
, tmp
))
3723 else if (time_before_eq(tmp
, jiffies
))
3725 if (ehc
->unloaded_mask
& (1 << dev
->devno
))
3728 ata_eh_park_issue_cmd(dev
, 1);
3733 if (time_before_eq(deadline
, now
))
3737 deadline
= wait_for_completion_timeout(&ap
->park_req_pending
,
3741 ata_for_each_link(link
, ap
, EDGE
) {
3742 ata_for_each_dev(dev
, link
, ALL
) {
3743 if (!(link
->eh_context
.unloaded_mask
&
3747 ata_eh_park_issue_cmd(dev
, 0);
3748 ata_eh_done(link
, dev
, ATA_EH_PARK
);
3754 ata_for_each_link(link
, ap
, PMP_FIRST
) {
3755 struct ata_eh_context
*ehc
= &link
->eh_context
;
3757 if (sata_pmp_attached(ap
) && ata_is_host_link(link
))
3760 /* revalidate existing devices and attach new ones */
3761 rc
= ata_eh_revalidate_and_attach(link
, &dev
);
3765 /* if PMP got attached, return, pmp EH will take care of it */
3766 if (link
->device
->class == ATA_DEV_PMP
) {
3771 /* configure transfer mode if necessary */
3772 if (ehc
->i
.flags
& ATA_EHI_SETMODE
) {
3773 rc
= ata_set_mode(link
, &dev
);
3776 ehc
->i
.flags
&= ~ATA_EHI_SETMODE
;
3779 /* If reset has been issued, clear UA to avoid
3780 * disrupting the current users of the device.
3782 if (ehc
->i
.flags
& ATA_EHI_DID_RESET
) {
3783 ata_for_each_dev(dev
, link
, ALL
) {
3784 if (dev
->class != ATA_DEV_ATAPI
)
3786 rc
= atapi_eh_clear_ua(dev
);
3792 /* retry flush if necessary */
3793 ata_for_each_dev(dev
, link
, ALL
) {
3794 if (dev
->class != ATA_DEV_ATA
)
3796 rc
= ata_eh_maybe_retry_flush(dev
);
3802 /* configure link power saving */
3803 if (link
->lpm_policy
!= ap
->target_lpm_policy
) {
3804 rc
= ata_eh_set_lpm(link
, ap
->target_lpm_policy
, &dev
);
3809 /* this link is okay now */
3816 ata_eh_handle_dev_fail(dev
, rc
);
3818 if (ap
->pflags
& ATA_PFLAG_FROZEN
) {
3819 /* PMP reset requires working host port.
3820 * Can't retry if it's frozen.
3822 if (sata_pmp_attached(ap
))
3832 if (rc
&& r_failed_link
)
3833 *r_failed_link
= link
;
3835 DPRINTK("EXIT, rc=%d\n", rc
);
3840 * ata_eh_finish - finish up EH
3841 * @ap: host port to finish EH for
3843 * Recovery is complete. Clean up EH states and retry or finish
3849 void ata_eh_finish(struct ata_port
*ap
)
3853 /* retry or finish qcs */
3854 for (tag
= 0; tag
< ATA_MAX_QUEUE
; tag
++) {
3855 struct ata_queued_cmd
*qc
= __ata_qc_from_tag(ap
, tag
);
3857 if (!(qc
->flags
& ATA_QCFLAG_FAILED
))
3861 /* FIXME: Once EH migration is complete,
3862 * generate sense data in this function,
3863 * considering both err_mask and tf.
3865 if (qc
->flags
& ATA_QCFLAG_RETRY
)
3866 ata_eh_qc_retry(qc
);
3868 ata_eh_qc_complete(qc
);
3870 if (qc
->flags
& ATA_QCFLAG_SENSE_VALID
) {
3871 ata_eh_qc_complete(qc
);
3873 /* feed zero TF to sense generation */
3874 memset(&qc
->result_tf
, 0, sizeof(qc
->result_tf
));
3875 ata_eh_qc_retry(qc
);
3880 /* make sure nr_active_links is zero after EH */
3881 WARN_ON(ap
->nr_active_links
);
3882 ap
->nr_active_links
= 0;
3886 * ata_do_eh - do standard error handling
3887 * @ap: host port to handle error for
3889 * @prereset: prereset method (can be NULL)
3890 * @softreset: softreset method (can be NULL)
3891 * @hardreset: hardreset method (can be NULL)
3892 * @postreset: postreset method (can be NULL)
3894 * Perform standard error handling sequence.
3897 * Kernel thread context (may sleep).
3899 void ata_do_eh(struct ata_port
*ap
, ata_prereset_fn_t prereset
,
3900 ata_reset_fn_t softreset
, ata_reset_fn_t hardreset
,
3901 ata_postreset_fn_t postreset
)
3903 struct ata_device
*dev
;
3909 rc
= ata_eh_recover(ap
, prereset
, softreset
, hardreset
, postreset
,
3912 ata_for_each_dev(dev
, &ap
->link
, ALL
)
3913 ata_dev_disable(dev
);
3920 * ata_std_error_handler - standard error handler
3921 * @ap: host port to handle error for
3923 * Standard error handler
3926 * Kernel thread context (may sleep).
3928 void ata_std_error_handler(struct ata_port
*ap
)
3930 struct ata_port_operations
*ops
= ap
->ops
;
3931 ata_reset_fn_t hardreset
= ops
->hardreset
;
3933 /* ignore built-in hardreset if SCR access is not available */
3934 if (hardreset
== sata_std_hardreset
&& !sata_scr_valid(&ap
->link
))
3937 ata_do_eh(ap
, ops
->prereset
, ops
->softreset
, hardreset
, ops
->postreset
);
3942 * ata_eh_handle_port_suspend - perform port suspend operation
3943 * @ap: port to suspend
3948 * Kernel thread context (may sleep).
3950 static void ata_eh_handle_port_suspend(struct ata_port
*ap
)
3952 unsigned long flags
;
3955 /* are we suspending? */
3956 spin_lock_irqsave(ap
->lock
, flags
);
3957 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
3958 ap
->pm_mesg
.event
== PM_EVENT_ON
) {
3959 spin_unlock_irqrestore(ap
->lock
, flags
);
3962 spin_unlock_irqrestore(ap
->lock
, flags
);
3964 WARN_ON(ap
->pflags
& ATA_PFLAG_SUSPENDED
);
3966 /* tell ACPI we're suspending */
3967 rc
= ata_acpi_on_suspend(ap
);
3972 ata_eh_freeze_port(ap
);
3974 if (ap
->ops
->port_suspend
)
3975 rc
= ap
->ops
->port_suspend(ap
, ap
->pm_mesg
);
3977 ata_acpi_set_state(ap
, PMSG_SUSPEND
);
3980 spin_lock_irqsave(ap
->lock
, flags
);
3982 ap
->pflags
&= ~ATA_PFLAG_PM_PENDING
;
3984 ap
->pflags
|= ATA_PFLAG_SUSPENDED
;
3985 else if (ap
->pflags
& ATA_PFLAG_FROZEN
)
3986 ata_port_schedule_eh(ap
);
3988 if (ap
->pm_result
) {
3989 *ap
->pm_result
= rc
;
3990 ap
->pm_result
= NULL
;
3993 spin_unlock_irqrestore(ap
->lock
, flags
);
3999 * ata_eh_handle_port_resume - perform port resume operation
4000 * @ap: port to resume
4005 * Kernel thread context (may sleep).
4007 static void ata_eh_handle_port_resume(struct ata_port
*ap
)
4009 struct ata_link
*link
;
4010 struct ata_device
*dev
;
4011 unsigned long flags
;
4014 /* are we resuming? */
4015 spin_lock_irqsave(ap
->lock
, flags
);
4016 if (!(ap
->pflags
& ATA_PFLAG_PM_PENDING
) ||
4017 ap
->pm_mesg
.event
!= PM_EVENT_ON
) {
4018 spin_unlock_irqrestore(ap
->lock
, flags
);
4021 spin_unlock_irqrestore(ap
->lock
, flags
);
4023 WARN_ON(!(ap
->pflags
& ATA_PFLAG_SUSPENDED
));
4026 * Error timestamps are in jiffies which doesn't run while
4027 * suspended and PHY events during resume isn't too uncommon.
4028 * When the two are combined, it can lead to unnecessary speed
4029 * downs if the machine is suspended and resumed repeatedly.
4030 * Clear error history.
4032 ata_for_each_link(link
, ap
, HOST_FIRST
)
4033 ata_for_each_dev(dev
, link
, ALL
)
4034 ata_ering_clear(&dev
->ering
);
4036 ata_acpi_set_state(ap
, PMSG_ON
);
4038 if (ap
->ops
->port_resume
)
4039 rc
= ap
->ops
->port_resume(ap
);
4041 /* tell ACPI that we're resuming */
4042 ata_acpi_on_resume(ap
);
4045 spin_lock_irqsave(ap
->lock
, flags
);
4046 ap
->pflags
&= ~(ATA_PFLAG_PM_PENDING
| ATA_PFLAG_SUSPENDED
);
4047 if (ap
->pm_result
) {
4048 *ap
->pm_result
= rc
;
4049 ap
->pm_result
= NULL
;
4051 spin_unlock_irqrestore(ap
->lock
, flags
);
4053 #endif /* CONFIG_PM */