2 * libata-eh.c - libata error handling
4 * Maintained by: Tejun Heo <tj@kernel.org>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2006 Tejun Heo <htejun@gmail.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/kernel.h>
36 #include <linux/blkdev.h>
37 #include <linux/export.h>
38 #include <linux/pci.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi_eh.h>
42 #include <scsi/scsi_device.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_dbg.h>
45 #include "../scsi/scsi_transport_api.h"
47 #include <linux/libata.h>
49 #include <trace/events/libata.h>
53 /* speed down verdicts */
54 ATA_EH_SPDN_NCQ_OFF = (1 << 0),
55 ATA_EH_SPDN_SPEED_DOWN = (1 << 1),
56 ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2),
57 ATA_EH_SPDN_KEEP_ERRORS = (1 << 3),
60 ATA_EFLAG_IS_IO = (1 << 0),
61 ATA_EFLAG_DUBIOUS_XFER = (1 << 1),
62 ATA_EFLAG_OLD_ER = (1 << 31),
64 /* error categories */
67 ATA_ECAT_TOUT_HSM = 2,
69 ATA_ECAT_DUBIOUS_NONE = 4,
70 ATA_ECAT_DUBIOUS_ATA_BUS = 5,
71 ATA_ECAT_DUBIOUS_TOUT_HSM = 6,
72 ATA_ECAT_DUBIOUS_UNK_DEV = 7,
75 ATA_EH_CMD_DFL_TIMEOUT = 5000,
77 /* always put at least this amount of time between resets */
78 ATA_EH_RESET_COOL_DOWN = 5000,
80 /* Waiting in ->prereset can never be reliable. It's
81 * sometimes nice to wait there but it can't be depended upon;
82 * otherwise, we wouldn't be resetting. Just give it enough
83 * time for most drives to spin up.
85 ATA_EH_PRERESET_TIMEOUT = 10000,
86 ATA_EH_FASTDRAIN_INTERVAL = 3000,
90 /* probe speed down parameters, see ata_eh_schedule_probe() */
91 ATA_EH_PROBE_TRIAL_INTERVAL = 60000, /* 1 min */
92 ATA_EH_PROBE_TRIALS = 2,
95 /* The following table determines how we sequence resets. Each entry
96 * represents timeout for that try. The first try can be soft or
97 * hardreset. All others are hardreset if available. In most cases
98 * the first reset w/ 10sec timeout should succeed. Following entries
99 * are mostly for error handling, hotplug and those outlier devices that
100 * take an exceptionally long time to recover from reset.
102 static const unsigned long ata_eh_reset_timeouts[] = {
103 10000, /* most drives spin up by 10sec */
104 10000, /* > 99% working drives spin up before 20sec */
105 35000, /* give > 30 secs of idleness for outlier devices */
106 5000, /* and sweet one last chance */
107 ULONG_MAX, /* > 1 min has elapsed, give up */
110 static const unsigned long ata_eh_identify_timeouts[] = {
111 5000, /* covers > 99% of successes and not too boring on failures */
112 10000, /* combined time till here is enough even for media access */
113 30000, /* for true idiots */
117 static const unsigned long ata_eh_flush_timeouts[] = {
118 15000, /* be generous with flush */
120 30000, /* and even more generous */
124 static const unsigned long ata_eh_other_timeouts[] = {
125 5000, /* same rationale as identify timeout */
127 /* but no merciful 30sec for other commands, it just isn't worth it */
131 struct ata_eh_cmd_timeout_ent {
133 const unsigned long *timeouts;
136 /* The following table determines timeouts to use for EH internal
137 * commands. Each table entry is a command class and matches the
138 * commands the entry applies to and the timeout table to use.
140 * On the retry after a command timed out, the next timeout value from
141 * the table is used. If the table doesn't contain further entries,
142 * the last value is used.
144 * ehc->cmd_timeout_idx keeps track of which timeout to use per
145 * command class, so if SET_FEATURES times out on the first try, the
146 * next try will use the second timeout value only for that class.
148 #define CMDS(cmds...) (const u8 []){ cmds, 0 }
149 static const struct ata_eh_cmd_timeout_ent
150 ata_eh_cmd_timeout_table[ATA_EH_CMD_TIMEOUT_TABLE_SIZE] = {
151 { .commands = CMDS(ATA_CMD_ID_ATA, ATA_CMD_ID_ATAPI),
152 .timeouts = ata_eh_identify_timeouts, },
153 { .commands = CMDS(ATA_CMD_READ_NATIVE_MAX, ATA_CMD_READ_NATIVE_MAX_EXT),
154 .timeouts = ata_eh_other_timeouts, },
155 { .commands = CMDS(ATA_CMD_SET_MAX, ATA_CMD_SET_MAX_EXT),
156 .timeouts = ata_eh_other_timeouts, },
157 { .commands = CMDS(ATA_CMD_SET_FEATURES),
158 .timeouts = ata_eh_other_timeouts, },
159 { .commands = CMDS(ATA_CMD_INIT_DEV_PARAMS),
160 .timeouts = ata_eh_other_timeouts, },
161 { .commands = CMDS(ATA_CMD_FLUSH, ATA_CMD_FLUSH_EXT),
162 .timeouts = ata_eh_flush_timeouts },
166 static void __ata_port_freeze(struct ata_port *ap);
168 static void ata_eh_handle_port_suspend(struct ata_port *ap);
169 static void ata_eh_handle_port_resume(struct ata_port *ap);
170 #else /* CONFIG_PM */
171 static void ata_eh_handle_port_suspend(struct ata_port *ap)
174 static void ata_eh_handle_port_resume(struct ata_port *ap)
176 #endif /* CONFIG_PM */
178 static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt,
181 ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len,
182 ATA_EH_DESC_LEN - ehi->desc_len,
187 * __ata_ehi_push_desc - push error description without adding separator
189 * @fmt: printf format string
191 * Format string according to @fmt and append it to @ehi->desc.
194 * spin_lock_irqsave(host lock)
196 void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
201 __ata_ehi_pushv_desc(ehi, fmt, args);
206 * ata_ehi_push_desc - push error description with separator
208 * @fmt: printf format string
210 * Format string according to @fmt and append it to @ehi->desc.
211 * If @ehi->desc is not empty, ", " is added in-between.
214 * spin_lock_irqsave(host lock)
216 void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
221 __ata_ehi_push_desc(ehi, ", ");
224 __ata_ehi_pushv_desc(ehi, fmt, args);
229 * ata_ehi_clear_desc - clean error description
235 * spin_lock_irqsave(host lock)
237 void ata_ehi_clear_desc(struct ata_eh_info *ehi)
244 * ata_port_desc - append port description
245 * @ap: target ATA port
246 * @fmt: printf format string
248 * Format string according to @fmt and append it to port
249 * description. If port description is not empty, " " is added
250 * in-between. This function is to be used while initializing
251 * ata_host. The description is printed on host registration.
256 void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
260 WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING));
262 if (ap->link.eh_info.desc_len)
263 __ata_ehi_push_desc(&ap->link.eh_info, " ");
266 __ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
273 * ata_port_pbar_desc - append PCI BAR description
274 * @ap: target ATA port
275 * @bar: target PCI BAR
276 * @offset: offset into PCI BAR
277 * @name: name of the area
279 * If @offset is negative, this function formats a string which
280 * contains the name, address, size and type of the BAR and
281 * appends it to the port description. If @offset is zero or
282 * positive, only name and offsetted address is appended.
287 void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
290 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
292 unsigned long long start, len;
294 if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
296 else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
299 start = (unsigned long long)pci_resource_start(pdev, bar);
300 len = (unsigned long long)pci_resource_len(pdev, bar);
303 ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start);
305 ata_port_desc(ap, "%s 0x%llx", name,
306 start + (unsigned long long)offset);
309 #endif /* CONFIG_PCI */
311 static int ata_lookup_timeout_table(u8 cmd)
315 for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
318 for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
327 * ata_internal_cmd_timeout - determine timeout for an internal command
328 * @dev: target device
329 * @cmd: internal command to be issued
331 * Determine timeout for internal command @cmd for @dev.
337 * Determined timeout.
339 unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd)
341 struct ata_eh_context *ehc = &dev->link->eh_context;
342 int ent = ata_lookup_timeout_table(cmd);
346 return ATA_EH_CMD_DFL_TIMEOUT;
348 idx = ehc->cmd_timeout_idx[dev->devno][ent];
349 return ata_eh_cmd_timeout_table[ent].timeouts[idx];
353 * ata_internal_cmd_timed_out - notification for internal command timeout
354 * @dev: target device
355 * @cmd: internal command which timed out
357 * Notify EH that internal command @cmd for @dev timed out. This
358 * function should be called only for commands whose timeouts are
359 * determined using ata_internal_cmd_timeout().
364 void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd)
366 struct ata_eh_context *ehc = &dev->link->eh_context;
367 int ent = ata_lookup_timeout_table(cmd);
373 idx = ehc->cmd_timeout_idx[dev->devno][ent];
374 if (ata_eh_cmd_timeout_table[ent].timeouts[idx + 1] != ULONG_MAX)
375 ehc->cmd_timeout_idx[dev->devno][ent]++;
378 static void ata_ering_record(struct ata_ering *ering, unsigned int eflags,
379 unsigned int err_mask)
381 struct ata_ering_entry *ent;
386 ering->cursor %= ATA_ERING_SIZE;
388 ent = &ering->ring[ering->cursor];
389 ent->eflags = eflags;
390 ent->err_mask = err_mask;
391 ent->timestamp = get_jiffies_64();
394 static struct ata_ering_entry *ata_ering_top(struct ata_ering *ering)
396 struct ata_ering_entry *ent = &ering->ring[ering->cursor];
403 int ata_ering_map(struct ata_ering *ering,
404 int (*map_fn)(struct ata_ering_entry *, void *),
408 struct ata_ering_entry *ent;
412 ent = &ering->ring[idx];
415 rc = map_fn(ent, arg);
418 idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
419 } while (idx != ering->cursor);
424 static int ata_ering_clear_cb(struct ata_ering_entry *ent, void *void_arg)
426 ent->eflags |= ATA_EFLAG_OLD_ER;
430 static void ata_ering_clear(struct ata_ering *ering)
432 ata_ering_map(ering, ata_ering_clear_cb, NULL);
435 static unsigned int ata_eh_dev_action(struct ata_device *dev)
437 struct ata_eh_context *ehc = &dev->link->eh_context;
439 return ehc->i.action | ehc->i.dev_action[dev->devno];
442 static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
443 struct ata_eh_info *ehi, unsigned int action)
445 struct ata_device *tdev;
448 ehi->action &= ~action;
449 ata_for_each_dev(tdev, link, ALL)
450 ehi->dev_action[tdev->devno] &= ~action;
452 /* doesn't make sense for port-wide EH actions */
453 WARN_ON(!(action & ATA_EH_PERDEV_MASK));
455 /* break ehi->action into ehi->dev_action */
456 if (ehi->action & action) {
457 ata_for_each_dev(tdev, link, ALL)
458 ehi->dev_action[tdev->devno] |=
459 ehi->action & action;
460 ehi->action &= ~action;
463 /* turn off the specified per-dev action */
464 ehi->dev_action[dev->devno] &= ~action;
469 * ata_eh_acquire - acquire EH ownership
470 * @ap: ATA port to acquire EH ownership for
472 * Acquire EH ownership for @ap. This is the basic exclusion
473 * mechanism for ports sharing a host. Only one port hanging off
474 * the same host can claim the ownership of EH.
479 void ata_eh_acquire(struct ata_port *ap)
481 mutex_lock(&ap->host->eh_mutex);
482 WARN_ON_ONCE(ap->host->eh_owner);
483 ap->host->eh_owner = current;
487 * ata_eh_release - release EH ownership
488 * @ap: ATA port to release EH ownership for
490 * Release EH ownership for @ap if the caller. The caller must
491 * have acquired EH ownership using ata_eh_acquire() previously.
496 void ata_eh_release(struct ata_port *ap)
498 WARN_ON_ONCE(ap->host->eh_owner != current);
499 ap->host->eh_owner = NULL;
500 mutex_unlock(&ap->host->eh_mutex);
504 * ata_scsi_timed_out - SCSI layer time out callback
505 * @cmd: timed out SCSI command
507 * Handles SCSI layer timeout. We race with normal completion of
508 * the qc for @cmd. If the qc is already gone, we lose and let
509 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
510 * timed out and EH should be invoked. Prevent ata_qc_complete()
511 * from finishing it by setting EH_SCHEDULED and return
514 * TODO: kill this function once old EH is gone.
517 * Called from timer context
520 * EH_HANDLED or EH_NOT_HANDLED
522 enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
524 struct Scsi_Host *host = cmd->device->host;
525 struct ata_port *ap = ata_shost_to_port(host);
527 struct ata_queued_cmd *qc;
528 enum blk_eh_timer_return ret;
532 if (ap->ops->error_handler) {
533 ret = BLK_EH_NOT_HANDLED;
537 ret = BLK_EH_HANDLED;
538 spin_lock_irqsave(ap->lock, flags);
539 qc = ata_qc_from_tag(ap, ap->link.active_tag);
541 WARN_ON(qc->scsicmd != cmd);
542 qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
543 qc->err_mask |= AC_ERR_TIMEOUT;
544 ret = BLK_EH_NOT_HANDLED;
546 spin_unlock_irqrestore(ap->lock, flags);
549 DPRINTK("EXIT, ret=%d\n", ret);
553 static void ata_eh_unload(struct ata_port *ap)
555 struct ata_link *link;
556 struct ata_device *dev;
559 /* Restore SControl IPM and SPD for the next driver and
560 * disable attached devices.
562 ata_for_each_link(link, ap, PMP_FIRST) {
563 sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
564 ata_for_each_dev(dev, link, ALL)
565 ata_dev_disable(dev);
568 /* freeze and set UNLOADED */
569 spin_lock_irqsave(ap->lock, flags);
571 ata_port_freeze(ap); /* won't be thawed */
572 ap->pflags &= ~ATA_PFLAG_EH_PENDING; /* clear pending from freeze */
573 ap->pflags |= ATA_PFLAG_UNLOADED;
575 spin_unlock_irqrestore(ap->lock, flags);
579 * ata_scsi_error - SCSI layer error handler callback
580 * @host: SCSI host on which error occurred
582 * Handles SCSI-layer-thrown error events.
585 * Inherited from SCSI layer (none, can sleep)
590 void ata_scsi_error(struct Scsi_Host *host)
592 struct ata_port *ap = ata_shost_to_port(host);
594 LIST_HEAD(eh_work_q);
598 spin_lock_irqsave(host->host_lock, flags);
599 list_splice_init(&host->eh_cmd_q, &eh_work_q);
600 spin_unlock_irqrestore(host->host_lock, flags);
602 ata_scsi_cmd_error_handler(host, ap, &eh_work_q);
604 /* If we timed raced normal completion and there is nothing to
605 recover nr_timedout == 0 why exactly are we doing error recovery ? */
606 ata_scsi_port_error_handler(host, ap);
608 /* finish or retry handled scmd's and clean up */
609 WARN_ON(host->host_failed || !list_empty(&eh_work_q));
615 * ata_scsi_cmd_error_handler - error callback for a list of commands
616 * @host: scsi host containing the port
617 * @ap: ATA port within the host
618 * @eh_work_q: list of commands to process
620 * process the given list of commands and return those finished to the
621 * ap->eh_done_q. This function is the first part of the libata error
622 * handler which processes a given list of failed commands.
624 void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap,
625 struct list_head *eh_work_q)
630 /* make sure sff pio task is not running */
631 ata_sff_flush_pio_task(ap);
633 /* synchronize with host lock and sort out timeouts */
635 /* For new EH, all qcs are finished in one of three ways -
636 * normal completion, error completion, and SCSI timeout.
637 * Both completions can race against SCSI timeout. When normal
638 * completion wins, the qc never reaches EH. When error
639 * completion wins, the qc has ATA_QCFLAG_FAILED set.
641 * When SCSI timeout wins, things are a bit more complex.
642 * Normal or error completion can occur after the timeout but
643 * before this point. In such cases, both types of
644 * completions are honored. A scmd is determined to have
645 * timed out iff its associated qc is active and not failed.
647 if (ap->ops->error_handler) {
648 struct scsi_cmnd *scmd, *tmp;
651 spin_lock_irqsave(ap->lock, flags);
653 /* This must occur under the ap->lock as we don't want
654 a polled recovery to race the real interrupt handler
656 The lost_interrupt handler checks for any completed but
657 non-notified command and completes much like an IRQ handler.
659 We then fall into the error recovery code which will treat
660 this as if normal completion won the race */
662 if (ap->ops->lost_interrupt)
663 ap->ops->lost_interrupt(ap);
665 list_for_each_entry_safe(scmd, tmp, eh_work_q, eh_entry) {
666 struct ata_queued_cmd *qc;
668 for (i = 0; i < ATA_MAX_QUEUE; i++) {
669 qc = __ata_qc_from_tag(ap, i);
670 if (qc->flags & ATA_QCFLAG_ACTIVE &&
675 if (i < ATA_MAX_QUEUE) {
676 /* the scmd has an associated qc */
677 if (!(qc->flags & ATA_QCFLAG_FAILED)) {
678 /* which hasn't failed yet, timeout */
679 qc->err_mask |= AC_ERR_TIMEOUT;
680 qc->flags |= ATA_QCFLAG_FAILED;
684 /* Normal completion occurred after
685 * SCSI timeout but before this point.
686 * Successfully complete it.
688 scmd->retries = scmd->allowed;
689 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
693 /* If we have timed out qcs. They belong to EH from
694 * this point but the state of the controller is
695 * unknown. Freeze the port to make sure the IRQ
696 * handler doesn't diddle with those qcs. This must
697 * be done atomically w.r.t. setting QCFLAG_FAILED.
700 __ata_port_freeze(ap);
702 spin_unlock_irqrestore(ap->lock, flags);
704 /* initialize eh_tries */
705 ap->eh_tries = ATA_EH_MAX_TRIES;
707 spin_unlock_wait(ap->lock);
710 EXPORT_SYMBOL(ata_scsi_cmd_error_handler);
713 * ata_scsi_port_error_handler - recover the port after the commands
714 * @host: SCSI host containing the port
717 * Handle the recovery of the port @ap after all the commands
718 * have been recovered.
720 void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap)
724 /* invoke error handler */
725 if (ap->ops->error_handler) {
726 struct ata_link *link;
728 /* acquire EH ownership */
731 /* kill fast drain timer */
732 del_timer_sync(&ap->fastdrain_timer);
734 /* process port resume request */
735 ata_eh_handle_port_resume(ap);
737 /* fetch & clear EH info */
738 spin_lock_irqsave(ap->lock, flags);
740 ata_for_each_link(link, ap, HOST_FIRST) {
741 struct ata_eh_context *ehc = &link->eh_context;
742 struct ata_device *dev;
744 memset(&link->eh_context, 0, sizeof(link->eh_context));
745 link->eh_context.i = link->eh_info;
746 memset(&link->eh_info, 0, sizeof(link->eh_info));
748 ata_for_each_dev(dev, link, ENABLED) {
749 int devno = dev->devno;
751 ehc->saved_xfer_mode[devno] = dev->xfer_mode;
752 if (ata_ncq_enabled(dev))
753 ehc->saved_ncq_enabled |= 1 << devno;
757 ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
758 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
759 ap->excl_link = NULL; /* don't maintain exclusion over EH */
761 spin_unlock_irqrestore(ap->lock, flags);
763 /* invoke EH, skip if unloading or suspended */
764 if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
765 ap->ops->error_handler(ap);
767 /* if unloading, commence suicide */
768 if ((ap->pflags & ATA_PFLAG_UNLOADING) &&
769 !(ap->pflags & ATA_PFLAG_UNLOADED))
774 /* process port suspend request */
775 ata_eh_handle_port_suspend(ap);
777 /* Exception might have happened after ->error_handler
778 * recovered the port but before this point. Repeat
781 spin_lock_irqsave(ap->lock, flags);
783 if (ap->pflags & ATA_PFLAG_EH_PENDING) {
784 if (--ap->eh_tries) {
785 spin_unlock_irqrestore(ap->lock, flags);
789 "EH pending after %d tries, giving up\n",
791 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
794 /* this run is complete, make sure EH info is clear */
795 ata_for_each_link(link, ap, HOST_FIRST)
796 memset(&link->eh_info, 0, sizeof(link->eh_info));
798 /* end eh (clear host_eh_scheduled) while holding
799 * ap->lock such that if exception occurs after this
800 * point but before EH completion, SCSI midlayer will
805 spin_unlock_irqrestore(ap->lock, flags);
808 WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
809 ap->ops->eng_timeout(ap);
812 scsi_eh_flush_done_q(&ap->eh_done_q);
815 spin_lock_irqsave(ap->lock, flags);
817 if (ap->pflags & ATA_PFLAG_LOADING)
818 ap->pflags &= ~ATA_PFLAG_LOADING;
819 else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
820 schedule_delayed_work(&ap->hotplug_task, 0);
822 if (ap->pflags & ATA_PFLAG_RECOVERED)
823 ata_port_info(ap, "EH complete\n");
825 ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
827 /* tell wait_eh that we're done */
828 ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
829 wake_up_all(&ap->eh_wait_q);
831 spin_unlock_irqrestore(ap->lock, flags);
833 EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler);
836 * ata_port_wait_eh - Wait for the currently pending EH to complete
837 * @ap: Port to wait EH for
839 * Wait until the currently pending EH is complete.
842 * Kernel thread context (may sleep).
844 void ata_port_wait_eh(struct ata_port *ap)
850 spin_lock_irqsave(ap->lock, flags);
852 while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
853 prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
854 spin_unlock_irqrestore(ap->lock, flags);
856 spin_lock_irqsave(ap->lock, flags);
858 finish_wait(&ap->eh_wait_q, &wait);
860 spin_unlock_irqrestore(ap->lock, flags);
862 /* make sure SCSI EH is complete */
863 if (scsi_host_in_recovery(ap->scsi_host)) {
868 EXPORT_SYMBOL_GPL(ata_port_wait_eh);
870 static int ata_eh_nr_in_flight(struct ata_port *ap)
875 /* count only non-internal commands */
876 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++)
877 if (ata_qc_from_tag(ap, tag))
883 void ata_eh_fastdrain_timerfn(unsigned long arg)
885 struct ata_port *ap = (void *)arg;
889 spin_lock_irqsave(ap->lock, flags);
891 cnt = ata_eh_nr_in_flight(ap);
897 if (cnt == ap->fastdrain_cnt) {
900 /* No progress during the last interval, tag all
901 * in-flight qcs as timed out and freeze the port.
903 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) {
904 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
906 qc->err_mask |= AC_ERR_TIMEOUT;
911 /* some qcs have finished, give it another chance */
912 ap->fastdrain_cnt = cnt;
913 ap->fastdrain_timer.expires =
914 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
915 add_timer(&ap->fastdrain_timer);
919 spin_unlock_irqrestore(ap->lock, flags);
923 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
924 * @ap: target ATA port
925 * @fastdrain: activate fast drain
927 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
928 * is non-zero and EH wasn't pending before. Fast drain ensures
929 * that EH kicks in in timely manner.
932 * spin_lock_irqsave(host lock)
934 static void ata_eh_set_pending(struct ata_port *ap, int fastdrain)
938 /* already scheduled? */
939 if (ap->pflags & ATA_PFLAG_EH_PENDING)
942 ap->pflags |= ATA_PFLAG_EH_PENDING;
947 /* do we have in-flight qcs? */
948 cnt = ata_eh_nr_in_flight(ap);
952 /* activate fast drain */
953 ap->fastdrain_cnt = cnt;
954 ap->fastdrain_timer.expires =
955 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
956 add_timer(&ap->fastdrain_timer);
960 * ata_qc_schedule_eh - schedule qc for error handling
961 * @qc: command to schedule error handling for
963 * Schedule error handling for @qc. EH will kick in as soon as
964 * other commands are drained.
967 * spin_lock_irqsave(host lock)
969 void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
971 struct ata_port *ap = qc->ap;
972 struct request_queue *q = qc->scsicmd->device->request_queue;
975 WARN_ON(!ap->ops->error_handler);
977 qc->flags |= ATA_QCFLAG_FAILED;
978 ata_eh_set_pending(ap, 1);
980 /* The following will fail if timeout has already expired.
981 * ata_scsi_error() takes care of such scmds on EH entry.
982 * Note that ATA_QCFLAG_FAILED is unconditionally set after
983 * this function completes.
985 spin_lock_irqsave(q->queue_lock, flags);
986 blk_abort_request(qc->scsicmd->request);
987 spin_unlock_irqrestore(q->queue_lock, flags);
991 * ata_std_sched_eh - non-libsas ata_ports issue eh with this common routine
992 * @ap: ATA port to schedule EH for
994 * LOCKING: inherited from ata_port_schedule_eh
995 * spin_lock_irqsave(host lock)
997 void ata_std_sched_eh(struct ata_port *ap)
999 WARN_ON(!ap->ops->error_handler);
1001 if (ap->pflags & ATA_PFLAG_INITIALIZING)
1004 ata_eh_set_pending(ap, 1);
1005 scsi_schedule_eh(ap->scsi_host);
1007 DPRINTK("port EH scheduled\n");
1009 EXPORT_SYMBOL_GPL(ata_std_sched_eh);
1012 * ata_std_end_eh - non-libsas ata_ports complete eh with this common routine
1013 * @ap: ATA port to end EH for
1015 * In the libata object model there is a 1:1 mapping of ata_port to
1016 * shost, so host fields can be directly manipulated under ap->lock, in
1017 * the libsas case we need to hold a lock at the ha->level to coordinate
1021 * spin_lock_irqsave(host lock)
1023 void ata_std_end_eh(struct ata_port *ap)
1025 struct Scsi_Host *host = ap->scsi_host;
1027 host->host_eh_scheduled = 0;
1029 EXPORT_SYMBOL(ata_std_end_eh);
1033 * ata_port_schedule_eh - schedule error handling without a qc
1034 * @ap: ATA port to schedule EH for
1036 * Schedule error handling for @ap. EH will kick in as soon as
1037 * all commands are drained.
1040 * spin_lock_irqsave(host lock)
1042 void ata_port_schedule_eh(struct ata_port *ap)
1044 /* see: ata_std_sched_eh, unless you know better */
1045 ap->ops->sched_eh(ap);
1048 static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
1050 int tag, nr_aborted = 0;
1052 WARN_ON(!ap->ops->error_handler);
1054 /* we're gonna abort all commands, no need for fast drain */
1055 ata_eh_set_pending(ap, 0);
1057 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1058 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
1060 if (qc && (!link || qc->dev->link == link)) {
1061 qc->flags |= ATA_QCFLAG_FAILED;
1062 ata_qc_complete(qc);
1068 ata_port_schedule_eh(ap);
1074 * ata_link_abort - abort all qc's on the link
1075 * @link: ATA link to abort qc's for
1077 * Abort all active qc's active on @link and schedule EH.
1080 * spin_lock_irqsave(host lock)
1083 * Number of aborted qc's.
1085 int ata_link_abort(struct ata_link *link)
1087 return ata_do_link_abort(link->ap, link);
1091 * ata_port_abort - abort all qc's on the port
1092 * @ap: ATA port to abort qc's for
1094 * Abort all active qc's of @ap and schedule EH.
1097 * spin_lock_irqsave(host_set lock)
1100 * Number of aborted qc's.
1102 int ata_port_abort(struct ata_port *ap)
1104 return ata_do_link_abort(ap, NULL);
1108 * __ata_port_freeze - freeze port
1109 * @ap: ATA port to freeze
1111 * This function is called when HSM violation or some other
1112 * condition disrupts normal operation of the port. Frozen port
1113 * is not allowed to perform any operation until the port is
1114 * thawed, which usually follows a successful reset.
1116 * ap->ops->freeze() callback can be used for freezing the port
1117 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1118 * port cannot be frozen hardware-wise, the interrupt handler
1119 * must ack and clear interrupts unconditionally while the port
1123 * spin_lock_irqsave(host lock)
1125 static void __ata_port_freeze(struct ata_port *ap)
1127 WARN_ON(!ap->ops->error_handler);
1129 if (ap->ops->freeze)
1130 ap->ops->freeze(ap);
1132 ap->pflags |= ATA_PFLAG_FROZEN;
1134 DPRINTK("ata%u port frozen\n", ap->print_id);
1138 * ata_port_freeze - abort & freeze port
1139 * @ap: ATA port to freeze
1141 * Abort and freeze @ap. The freeze operation must be called
1142 * first, because some hardware requires special operations
1143 * before the taskfile registers are accessible.
1146 * spin_lock_irqsave(host lock)
1149 * Number of aborted commands.
1151 int ata_port_freeze(struct ata_port *ap)
1155 WARN_ON(!ap->ops->error_handler);
1157 __ata_port_freeze(ap);
1158 nr_aborted = ata_port_abort(ap);
1164 * sata_async_notification - SATA async notification handler
1165 * @ap: ATA port where async notification is received
1167 * Handler to be called when async notification via SDB FIS is
1168 * received. This function schedules EH if necessary.
1171 * spin_lock_irqsave(host lock)
1174 * 1 if EH is scheduled, 0 otherwise.
1176 int sata_async_notification(struct ata_port *ap)
1181 if (!(ap->flags & ATA_FLAG_AN))
1184 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1186 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1188 if (!sata_pmp_attached(ap) || rc) {
1189 /* PMP is not attached or SNTF is not available */
1190 if (!sata_pmp_attached(ap)) {
1191 /* PMP is not attached. Check whether ATAPI
1192 * AN is configured. If so, notify media
1195 struct ata_device *dev = ap->link.device;
1197 if ((dev->class == ATA_DEV_ATAPI) &&
1198 (dev->flags & ATA_DFLAG_AN))
1199 ata_scsi_media_change_notify(dev);
1202 /* PMP is attached but SNTF is not available.
1203 * ATAPI async media change notification is
1204 * not used. The PMP must be reporting PHY
1205 * status change, schedule EH.
1207 ata_port_schedule_eh(ap);
1211 /* PMP is attached and SNTF is available */
1212 struct ata_link *link;
1214 /* check and notify ATAPI AN */
1215 ata_for_each_link(link, ap, EDGE) {
1216 if (!(sntf & (1 << link->pmp)))
1219 if ((link->device->class == ATA_DEV_ATAPI) &&
1220 (link->device->flags & ATA_DFLAG_AN))
1221 ata_scsi_media_change_notify(link->device);
1224 /* If PMP is reporting that PHY status of some
1225 * downstream ports has changed, schedule EH.
1227 if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
1228 ata_port_schedule_eh(ap);
1237 * ata_eh_freeze_port - EH helper to freeze port
1238 * @ap: ATA port to freeze
1245 void ata_eh_freeze_port(struct ata_port *ap)
1247 unsigned long flags;
1249 if (!ap->ops->error_handler)
1252 spin_lock_irqsave(ap->lock, flags);
1253 __ata_port_freeze(ap);
1254 spin_unlock_irqrestore(ap->lock, flags);
1258 * ata_port_thaw_port - EH helper to thaw port
1259 * @ap: ATA port to thaw
1261 * Thaw frozen port @ap.
1266 void ata_eh_thaw_port(struct ata_port *ap)
1268 unsigned long flags;
1270 if (!ap->ops->error_handler)
1273 spin_lock_irqsave(ap->lock, flags);
1275 ap->pflags &= ~ATA_PFLAG_FROZEN;
1280 spin_unlock_irqrestore(ap->lock, flags);
1282 DPRINTK("ata%u port thawed\n", ap->print_id);
1285 static void ata_eh_scsidone(struct scsi_cmnd *scmd)
1290 static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
1292 struct ata_port *ap = qc->ap;
1293 struct scsi_cmnd *scmd = qc->scsicmd;
1294 unsigned long flags;
1296 spin_lock_irqsave(ap->lock, flags);
1297 qc->scsidone = ata_eh_scsidone;
1298 __ata_qc_complete(qc);
1299 WARN_ON(ata_tag_valid(qc->tag));
1300 spin_unlock_irqrestore(ap->lock, flags);
1302 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
1306 * ata_eh_qc_complete - Complete an active ATA command from EH
1307 * @qc: Command to complete
1309 * Indicate to the mid and upper layers that an ATA command has
1310 * completed. To be used from EH.
1312 void ata_eh_qc_complete(struct ata_queued_cmd *qc)
1314 struct scsi_cmnd *scmd = qc->scsicmd;
1315 scmd->retries = scmd->allowed;
1316 __ata_eh_qc_complete(qc);
1320 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1321 * @qc: Command to retry
1323 * Indicate to the mid and upper layers that an ATA command
1324 * should be retried. To be used from EH.
1326 * SCSI midlayer limits the number of retries to scmd->allowed.
1327 * scmd->allowed is incremented for commands which get retried
1328 * due to unrelated failures (qc->err_mask is zero).
1330 void ata_eh_qc_retry(struct ata_queued_cmd *qc)
1332 struct scsi_cmnd *scmd = qc->scsicmd;
1335 __ata_eh_qc_complete(qc);
1339 * ata_dev_disable - disable ATA device
1340 * @dev: ATA device to disable
1347 void ata_dev_disable(struct ata_device *dev)
1349 if (!ata_dev_enabled(dev))
1352 if (ata_msg_drv(dev->link->ap))
1353 ata_dev_warn(dev, "disabled\n");
1354 ata_acpi_on_disable(dev);
1355 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
1358 /* From now till the next successful probe, ering is used to
1359 * track probe failures. Clear accumulated device error info.
1361 ata_ering_clear(&dev->ering);
1365 * ata_eh_detach_dev - detach ATA device
1366 * @dev: ATA device to detach
1373 void ata_eh_detach_dev(struct ata_device *dev)
1375 struct ata_link *link = dev->link;
1376 struct ata_port *ap = link->ap;
1377 struct ata_eh_context *ehc = &link->eh_context;
1378 unsigned long flags;
1380 ata_dev_disable(dev);
1382 spin_lock_irqsave(ap->lock, flags);
1384 dev->flags &= ~ATA_DFLAG_DETACH;
1386 if (ata_scsi_offline_dev(dev)) {
1387 dev->flags |= ATA_DFLAG_DETACHED;
1388 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
1391 /* clear per-dev EH info */
1392 ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK);
1393 ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK);
1394 ehc->saved_xfer_mode[dev->devno] = 0;
1395 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
1397 spin_unlock_irqrestore(ap->lock, flags);
1401 * ata_eh_about_to_do - about to perform eh_action
1402 * @link: target ATA link
1403 * @dev: target ATA dev for per-dev action (can be NULL)
1404 * @action: action about to be performed
1406 * Called just before performing EH actions to clear related bits
1407 * in @link->eh_info such that eh actions are not unnecessarily
1413 void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
1414 unsigned int action)
1416 struct ata_port *ap = link->ap;
1417 struct ata_eh_info *ehi = &link->eh_info;
1418 struct ata_eh_context *ehc = &link->eh_context;
1419 unsigned long flags;
1421 spin_lock_irqsave(ap->lock, flags);
1423 ata_eh_clear_action(link, dev, ehi, action);
1425 /* About to take EH action, set RECOVERED. Ignore actions on
1426 * slave links as master will do them again.
1428 if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link)
1429 ap->pflags |= ATA_PFLAG_RECOVERED;
1431 spin_unlock_irqrestore(ap->lock, flags);
1435 * ata_eh_done - EH action complete
1436 * @ap: target ATA port
1437 * @dev: target ATA dev for per-dev action (can be NULL)
1438 * @action: action just completed
1440 * Called right after performing EH actions to clear related bits
1441 * in @link->eh_context.
1446 void ata_eh_done(struct ata_link *link, struct ata_device *dev,
1447 unsigned int action)
1449 struct ata_eh_context *ehc = &link->eh_context;
1451 ata_eh_clear_action(link, dev, &ehc->i, action);
1455 * ata_err_string - convert err_mask to descriptive string
1456 * @err_mask: error mask to convert to string
1458 * Convert @err_mask to descriptive string. Errors are
1459 * prioritized according to severity and only the most severe
1460 * error is reported.
1466 * Descriptive string for @err_mask
1468 static const char *ata_err_string(unsigned int err_mask)
1470 if (err_mask & AC_ERR_HOST_BUS)
1471 return "host bus error";
1472 if (err_mask & AC_ERR_ATA_BUS)
1473 return "ATA bus error";
1474 if (err_mask & AC_ERR_TIMEOUT)
1476 if (err_mask & AC_ERR_HSM)
1477 return "HSM violation";
1478 if (err_mask & AC_ERR_SYSTEM)
1479 return "internal error";
1480 if (err_mask & AC_ERR_MEDIA)
1481 return "media error";
1482 if (err_mask & AC_ERR_INVALID)
1483 return "invalid argument";
1484 if (err_mask & AC_ERR_DEV)
1485 return "device error";
1486 return "unknown error";
1490 * ata_read_log_page - read a specific log page
1491 * @dev: target device
1493 * @page: page to read
1494 * @buf: buffer to store read page
1495 * @sectors: number of sectors to read
1497 * Read log page using READ_LOG_EXT command.
1500 * Kernel thread context (may sleep).
1503 * 0 on success, AC_ERR_* mask otherwise.
1505 unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
1506 u8 page, void *buf, unsigned int sectors)
1508 struct ata_taskfile tf;
1509 unsigned int err_mask;
1511 DPRINTK("read log page - log 0x%x, page 0x%x\n", log, page);
1513 ata_tf_init(dev, &tf);
1514 if (dev->dma_mode && ata_id_has_read_log_dma_ext(dev->id)) {
1515 tf.command = ATA_CMD_READ_LOG_DMA_EXT;
1516 tf.protocol = ATA_PROT_DMA;
1518 tf.command = ATA_CMD_READ_LOG_EXT;
1519 tf.protocol = ATA_PROT_PIO;
1524 tf.hob_nsect = sectors >> 8;
1525 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
1527 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1528 buf, sectors * ATA_SECT_SIZE, 0);
1530 DPRINTK("EXIT, err_mask=%x\n", err_mask);
1535 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1536 * @dev: Device to read log page 10h from
1537 * @tag: Resulting tag of the failed command
1538 * @tf: Resulting taskfile registers of the failed command
1540 * Read log page 10h to obtain NCQ error details and clear error
1544 * Kernel thread context (may sleep).
1547 * 0 on success, -errno otherwise.
1549 static int ata_eh_read_log_10h(struct ata_device *dev,
1550 int *tag, struct ata_taskfile *tf)
1552 u8 *buf = dev->link->ap->sector_buf;
1553 unsigned int err_mask;
1557 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1);
1562 for (i = 0; i < ATA_SECT_SIZE; i++)
1565 ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n",
1571 *tag = buf[0] & 0x1f;
1573 tf->command = buf[2];
1574 tf->feature = buf[3];
1578 tf->device = buf[7];
1579 tf->hob_lbal = buf[8];
1580 tf->hob_lbam = buf[9];
1581 tf->hob_lbah = buf[10];
1582 tf->nsect = buf[12];
1583 tf->hob_nsect = buf[13];
1584 if (ata_id_has_ncq_autosense(dev->id))
1585 tf->auxiliary = buf[14] << 16 | buf[15] << 8 | buf[16];
1591 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1592 * @dev: target ATAPI device
1593 * @r_sense_key: out parameter for sense_key
1595 * Perform ATAPI TEST_UNIT_READY.
1598 * EH context (may sleep).
1601 * 0 on success, AC_ERR_* mask on failure.
1603 unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key)
1605 u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 };
1606 struct ata_taskfile tf;
1607 unsigned int err_mask;
1609 ata_tf_init(dev, &tf);
1611 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1612 tf.command = ATA_CMD_PACKET;
1613 tf.protocol = ATAPI_PROT_NODATA;
1615 err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
1616 if (err_mask == AC_ERR_DEV)
1617 *r_sense_key = tf.feature >> 4;
1622 * ata_eh_request_sense - perform REQUEST_SENSE_DATA_EXT
1623 * @dev: device to perform REQUEST_SENSE_SENSE_DATA_EXT to
1624 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1625 * @dfl_sense_key: default sense key to use
1627 * Perform REQUEST_SENSE_DATA_EXT after the device reported CHECK
1628 * SENSE. This function is EH helper.
1631 * Kernel thread context (may sleep).
1634 * encoded sense data on success, 0 on failure or if sense data
1637 static u32 ata_eh_request_sense(struct ata_queued_cmd *qc,
1638 struct scsi_cmnd *cmd)
1640 struct ata_device *dev = qc->dev;
1641 struct ata_taskfile tf;
1642 unsigned int err_mask;
1647 DPRINTK("ATA request sense\n");
1648 ata_dev_warn(dev, "request sense\n");
1649 if (!ata_id_sense_reporting_enabled(dev->id)) {
1650 ata_dev_warn(qc->dev, "sense data reporting disabled\n");
1653 ata_tf_init(dev, &tf);
1655 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1656 tf.flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1657 tf.command = ATA_CMD_REQ_SENSE_DATA;
1658 tf.protocol = ATA_PROT_NODATA;
1660 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1663 * The device may set the SENSE DATA AVAILABLE bit to one in the
1664 * STATUS field and clear the ERROR bit to zero in the STATUS field
1665 * to indicate that the command returned completion without an error
1666 * and the sense data described in table 306 is available.
1668 * IOW the 'ATA_SENSE' bit might not be set even though valid
1669 * sense data is available.
1670 * So check for both.
1672 if ((tf.command & ATA_SENSE) ||
1673 tf.lbah != 0 || tf.lbam != 0 || tf.lbal != 0) {
1674 ata_scsi_set_sense(cmd, tf.lbah, tf.lbam, tf.lbal);
1675 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1676 ata_dev_warn(dev, "sense data %02x/%02x/%02x\n",
1677 tf.lbah, tf.lbam, tf.lbal);
1679 ata_dev_warn(dev, "request sense failed stat %02x emask %x\n",
1680 tf.command, err_mask);
1686 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1687 * @dev: device to perform REQUEST_SENSE to
1688 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1689 * @dfl_sense_key: default sense key to use
1691 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1692 * SENSE. This function is EH helper.
1695 * Kernel thread context (may sleep).
1698 * 0 on success, AC_ERR_* mask on failure
1700 unsigned int atapi_eh_request_sense(struct ata_device *dev,
1701 u8 *sense_buf, u8 dfl_sense_key)
1703 u8 cdb[ATAPI_CDB_LEN] =
1704 { REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 };
1705 struct ata_port *ap = dev->link->ap;
1706 struct ata_taskfile tf;
1708 DPRINTK("ATAPI request sense\n");
1710 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
1712 /* initialize sense_buf with the error register,
1713 * for the case where they are -not- overwritten
1715 sense_buf[0] = 0x70;
1716 sense_buf[2] = dfl_sense_key;
1718 /* some devices time out if garbage left in tf */
1719 ata_tf_init(dev, &tf);
1721 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1722 tf.command = ATA_CMD_PACKET;
1724 /* is it pointless to prefer PIO for "safety reasons"? */
1725 if (ap->flags & ATA_FLAG_PIO_DMA) {
1726 tf.protocol = ATAPI_PROT_DMA;
1727 tf.feature |= ATAPI_PKT_DMA;
1729 tf.protocol = ATAPI_PROT_PIO;
1730 tf.lbam = SCSI_SENSE_BUFFERSIZE;
1734 return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
1735 sense_buf, SCSI_SENSE_BUFFERSIZE, 0);
1739 * ata_eh_analyze_serror - analyze SError for a failed port
1740 * @link: ATA link to analyze SError for
1742 * Analyze SError if available and further determine cause of
1748 static void ata_eh_analyze_serror(struct ata_link *link)
1750 struct ata_eh_context *ehc = &link->eh_context;
1751 u32 serror = ehc->i.serror;
1752 unsigned int err_mask = 0, action = 0;
1755 if (serror & (SERR_PERSISTENT | SERR_DATA)) {
1756 err_mask |= AC_ERR_ATA_BUS;
1757 action |= ATA_EH_RESET;
1759 if (serror & SERR_PROTOCOL) {
1760 err_mask |= AC_ERR_HSM;
1761 action |= ATA_EH_RESET;
1763 if (serror & SERR_INTERNAL) {
1764 err_mask |= AC_ERR_SYSTEM;
1765 action |= ATA_EH_RESET;
1768 /* Determine whether a hotplug event has occurred. Both
1769 * SError.N/X are considered hotplug events for enabled or
1770 * host links. For disabled PMP links, only N bit is
1771 * considered as X bit is left at 1 for link plugging.
1773 if (link->lpm_policy > ATA_LPM_MAX_POWER)
1774 hotplug_mask = 0; /* hotplug doesn't work w/ LPM */
1775 else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
1776 hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;
1778 hotplug_mask = SERR_PHYRDY_CHG;
1780 if (serror & hotplug_mask)
1781 ata_ehi_hotplugged(&ehc->i);
1783 ehc->i.err_mask |= err_mask;
1784 ehc->i.action |= action;
1788 * ata_eh_analyze_ncq_error - analyze NCQ error
1789 * @link: ATA link to analyze NCQ error for
1791 * Read log page 10h, determine the offending qc and acquire
1792 * error status TF. For NCQ device errors, all LLDDs have to do
1793 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1797 * Kernel thread context (may sleep).
1799 void ata_eh_analyze_ncq_error(struct ata_link *link)
1801 struct ata_port *ap = link->ap;
1802 struct ata_eh_context *ehc = &link->eh_context;
1803 struct ata_device *dev = link->device;
1804 struct ata_queued_cmd *qc;
1805 struct ata_taskfile tf;
1808 /* if frozen, we can't do much */
1809 if (ap->pflags & ATA_PFLAG_FROZEN)
1812 /* is it NCQ device error? */
1813 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
1816 /* has LLDD analyzed already? */
1817 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1818 qc = __ata_qc_from_tag(ap, tag);
1820 if (!(qc->flags & ATA_QCFLAG_FAILED))
1827 /* okay, this error is ours */
1828 memset(&tf, 0, sizeof(tf));
1829 rc = ata_eh_read_log_10h(dev, &tag, &tf);
1831 ata_link_err(link, "failed to read log page 10h (errno=%d)\n",
1836 if (!(link->sactive & (1 << tag))) {
1837 ata_link_err(link, "log page 10h reported inactive tag %d\n",
1842 /* we've got the perpetrator, condemn it */
1843 qc = __ata_qc_from_tag(ap, tag);
1844 memcpy(&qc->result_tf, &tf, sizeof(tf));
1845 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1846 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
1847 if (qc->result_tf.auxiliary) {
1848 char sense_key, asc, ascq;
1850 sense_key = (qc->result_tf.auxiliary >> 16) & 0xff;
1851 asc = (qc->result_tf.auxiliary >> 8) & 0xff;
1852 ascq = qc->result_tf.auxiliary & 0xff;
1853 ata_dev_dbg(dev, "NCQ Autosense %02x/%02x/%02x\n",
1854 sense_key, asc, ascq);
1855 ata_scsi_set_sense(qc->scsicmd, sense_key, asc, ascq);
1856 ata_scsi_set_sense_information(qc->scsicmd, &qc->result_tf);
1857 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1860 ehc->i.err_mask &= ~AC_ERR_DEV;
1864 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1865 * @qc: qc to analyze
1866 * @tf: Taskfile registers to analyze
1868 * Analyze taskfile of @qc and further determine cause of
1869 * failure. This function also requests ATAPI sense data if
1873 * Kernel thread context (may sleep).
1876 * Determined recovery action
1878 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
1879 const struct ata_taskfile *tf)
1881 unsigned int tmp, action = 0;
1882 u8 stat = tf->command, err = tf->feature;
1884 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
1885 qc->err_mask |= AC_ERR_HSM;
1886 return ATA_EH_RESET;
1890 * Sense data reporting does not work if the
1891 * device fault bit is set.
1893 if ((stat & ATA_SENSE) && !(stat & ATA_DF) &&
1894 !(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
1895 if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
1896 tmp = ata_eh_request_sense(qc, qc->scsicmd);
1898 qc->err_mask |= tmp;
1900 ata_scsi_set_sense_information(qc->scsicmd, tf);
1902 ata_dev_warn(qc->dev, "sense data available but port frozen\n");
1906 /* Set by NCQ autosense or request sense above */
1907 if (qc->flags & ATA_QCFLAG_SENSE_VALID)
1910 if (stat & (ATA_ERR | ATA_DF))
1911 qc->err_mask |= AC_ERR_DEV;
1915 switch (qc->dev->class) {
1919 qc->err_mask |= AC_ERR_ATA_BUS;
1920 if (err & (ATA_UNC | ATA_AMNF))
1921 qc->err_mask |= AC_ERR_MEDIA;
1923 qc->err_mask |= AC_ERR_INVALID;
1927 if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
1928 tmp = atapi_eh_request_sense(qc->dev,
1929 qc->scsicmd->sense_buffer,
1930 qc->result_tf.feature >> 4);
1932 /* ATA_QCFLAG_SENSE_VALID is used to
1933 * tell atapi_qc_complete() that sense
1934 * data is already valid.
1936 * TODO: interpret sense data and set
1937 * appropriate err_mask.
1939 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1941 qc->err_mask |= tmp;
1945 if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
1946 action |= ATA_EH_RESET;
1951 static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask,
1956 if (!(eflags & ATA_EFLAG_DUBIOUS_XFER))
1960 base = ATA_ECAT_DUBIOUS_NONE;
1962 if (err_mask & AC_ERR_ATA_BUS)
1963 return base + ATA_ECAT_ATA_BUS;
1965 if (err_mask & AC_ERR_TIMEOUT)
1966 return base + ATA_ECAT_TOUT_HSM;
1968 if (eflags & ATA_EFLAG_IS_IO) {
1969 if (err_mask & AC_ERR_HSM)
1970 return base + ATA_ECAT_TOUT_HSM;
1972 (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
1973 return base + ATA_ECAT_UNK_DEV;
1979 struct speed_down_verdict_arg {
1982 int nr_errors[ATA_ECAT_NR];
1985 static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
1987 struct speed_down_verdict_arg *arg = void_arg;
1990 if ((ent->eflags & ATA_EFLAG_OLD_ER) || (ent->timestamp < arg->since))
1993 cat = ata_eh_categorize_error(ent->eflags, ent->err_mask,
1995 arg->nr_errors[cat]++;
2001 * ata_eh_speed_down_verdict - Determine speed down verdict
2002 * @dev: Device of interest
2004 * This function examines error ring of @dev and determines
2005 * whether NCQ needs to be turned off, transfer speed should be
2006 * stepped down, or falling back to PIO is necessary.
2008 * ECAT_ATA_BUS : ATA_BUS error for any command
2010 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
2013 * ECAT_UNK_DEV : Unknown DEV error for IO commands
2015 * ECAT_DUBIOUS_* : Identical to above three but occurred while
2016 * data transfer hasn't been verified.
2020 * NCQ_OFF : Turn off NCQ.
2022 * SPEED_DOWN : Speed down transfer speed but don't fall back
2025 * FALLBACK_TO_PIO : Fall back to PIO.
2027 * Even if multiple verdicts are returned, only one action is
2028 * taken per error. An action triggered by non-DUBIOUS errors
2029 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
2030 * This is to expedite speed down decisions right after device is
2031 * initially configured.
2033 * The followings are speed down rules. #1 and #2 deal with
2036 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
2037 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
2039 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
2040 * occurred during last 5 mins, NCQ_OFF.
2042 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
2043 * occurred during last 5 mins, FALLBACK_TO_PIO
2045 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
2046 * during last 10 mins, NCQ_OFF.
2048 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
2049 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
2052 * Inherited from caller.
2055 * OR of ATA_EH_SPDN_* flags.
2057 static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev)
2059 const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ;
2060 u64 j64 = get_jiffies_64();
2061 struct speed_down_verdict_arg arg;
2062 unsigned int verdict = 0;
2064 /* scan past 5 mins of error history */
2065 memset(&arg, 0, sizeof(arg));
2066 arg.since = j64 - min(j64, j5mins);
2067 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
2069 if (arg.nr_errors[ATA_ECAT_DUBIOUS_ATA_BUS] +
2070 arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1)
2071 verdict |= ATA_EH_SPDN_SPEED_DOWN |
2072 ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS;
2074 if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] +
2075 arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1)
2076 verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS;
2078 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
2079 arg.nr_errors[ATA_ECAT_TOUT_HSM] +
2080 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
2081 verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
2083 /* scan past 10 mins of error history */
2084 memset(&arg, 0, sizeof(arg));
2085 arg.since = j64 - min(j64, j10mins);
2086 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
2088 if (arg.nr_errors[ATA_ECAT_TOUT_HSM] +
2089 arg.nr_errors[ATA_ECAT_UNK_DEV] > 3)
2090 verdict |= ATA_EH_SPDN_NCQ_OFF;
2092 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
2093 arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 ||
2094 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
2095 verdict |= ATA_EH_SPDN_SPEED_DOWN;
2101 * ata_eh_speed_down - record error and speed down if necessary
2102 * @dev: Failed device
2103 * @eflags: mask of ATA_EFLAG_* flags
2104 * @err_mask: err_mask of the error
2106 * Record error and examine error history to determine whether
2107 * adjusting transmission speed is necessary. It also sets
2108 * transmission limits appropriately if such adjustment is
2112 * Kernel thread context (may sleep).
2115 * Determined recovery action.
2117 static unsigned int ata_eh_speed_down(struct ata_device *dev,
2118 unsigned int eflags, unsigned int err_mask)
2120 struct ata_link *link = ata_dev_phys_link(dev);
2122 unsigned int verdict;
2123 unsigned int action = 0;
2125 /* don't bother if Cat-0 error */
2126 if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0)
2129 /* record error and determine whether speed down is necessary */
2130 ata_ering_record(&dev->ering, eflags, err_mask);
2131 verdict = ata_eh_speed_down_verdict(dev);
2134 if ((verdict & ATA_EH_SPDN_NCQ_OFF) &&
2135 (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ |
2136 ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) {
2137 dev->flags |= ATA_DFLAG_NCQ_OFF;
2138 ata_dev_warn(dev, "NCQ disabled due to excessive errors\n");
2143 if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
2144 /* speed down SATA link speed if possible */
2145 if (sata_down_spd_limit(link, 0) == 0) {
2146 action |= ATA_EH_RESET;
2150 /* lower transfer mode */
2151 if (dev->spdn_cnt < 2) {
2152 static const int dma_dnxfer_sel[] =
2153 { ATA_DNXFER_DMA, ATA_DNXFER_40C };
2154 static const int pio_dnxfer_sel[] =
2155 { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 };
2158 if (dev->xfer_shift != ATA_SHIFT_PIO)
2159 sel = dma_dnxfer_sel[dev->spdn_cnt];
2161 sel = pio_dnxfer_sel[dev->spdn_cnt];
2165 if (ata_down_xfermask_limit(dev, sel) == 0) {
2166 action |= ATA_EH_RESET;
2172 /* Fall back to PIO? Slowing down to PIO is meaningless for
2173 * SATA ATA devices. Consider it only for PATA and SATAPI.
2175 if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
2176 (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) &&
2177 (dev->xfer_shift != ATA_SHIFT_PIO)) {
2178 if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
2180 action |= ATA_EH_RESET;
2187 /* device has been slowed down, blow error history */
2188 if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS))
2189 ata_ering_clear(&dev->ering);
2194 * ata_eh_worth_retry - analyze error and decide whether to retry
2195 * @qc: qc to possibly retry
2197 * Look at the cause of the error and decide if a retry
2198 * might be useful or not. We don't want to retry media errors
2199 * because the drive itself has probably already taken 10-30 seconds
2200 * doing its own internal retries before reporting the failure.
2202 static inline int ata_eh_worth_retry(struct ata_queued_cmd *qc)
2204 if (qc->err_mask & AC_ERR_MEDIA)
2205 return 0; /* don't retry media errors */
2206 if (qc->flags & ATA_QCFLAG_IO)
2207 return 1; /* otherwise retry anything from fs stack */
2208 if (qc->err_mask & AC_ERR_INVALID)
2209 return 0; /* don't retry these */
2210 return qc->err_mask != AC_ERR_DEV; /* retry if not dev error */
2214 * ata_eh_link_autopsy - analyze error and determine recovery action
2215 * @link: host link to perform autopsy on
2217 * Analyze why @link failed and determine which recovery actions
2218 * are needed. This function also sets more detailed AC_ERR_*
2219 * values and fills sense data for ATAPI CHECK SENSE.
2222 * Kernel thread context (may sleep).
2224 static void ata_eh_link_autopsy(struct ata_link *link)
2226 struct ata_port *ap = link->ap;
2227 struct ata_eh_context *ehc = &link->eh_context;
2228 struct ata_device *dev;
2229 unsigned int all_err_mask = 0, eflags = 0;
2236 if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
2239 /* obtain and analyze SError */
2240 rc = sata_scr_read(link, SCR_ERROR, &serror);
2242 ehc->i.serror |= serror;
2243 ata_eh_analyze_serror(link);
2244 } else if (rc != -EOPNOTSUPP) {
2245 /* SError read failed, force reset and probing */
2246 ehc->i.probe_mask |= ATA_ALL_DEVICES;
2247 ehc->i.action |= ATA_EH_RESET;
2248 ehc->i.err_mask |= AC_ERR_OTHER;
2251 /* analyze NCQ failure */
2252 ata_eh_analyze_ncq_error(link);
2254 /* any real error trumps AC_ERR_OTHER */
2255 if (ehc->i.err_mask & ~AC_ERR_OTHER)
2256 ehc->i.err_mask &= ~AC_ERR_OTHER;
2258 all_err_mask |= ehc->i.err_mask;
2260 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2261 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2263 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2264 ata_dev_phys_link(qc->dev) != link)
2267 /* inherit upper level err_mask */
2268 qc->err_mask |= ehc->i.err_mask;
2271 ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
2273 /* DEV errors are probably spurious in case of ATA_BUS error */
2274 if (qc->err_mask & AC_ERR_ATA_BUS)
2275 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
2278 /* any real error trumps unknown error */
2279 if (qc->err_mask & ~AC_ERR_OTHER)
2280 qc->err_mask &= ~AC_ERR_OTHER;
2282 /* SENSE_VALID trumps dev/unknown error and revalidation */
2283 if (qc->flags & ATA_QCFLAG_SENSE_VALID)
2284 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
2286 /* determine whether the command is worth retrying */
2287 if (ata_eh_worth_retry(qc))
2288 qc->flags |= ATA_QCFLAG_RETRY;
2290 /* accumulate error info */
2291 ehc->i.dev = qc->dev;
2292 all_err_mask |= qc->err_mask;
2293 if (qc->flags & ATA_QCFLAG_IO)
2294 eflags |= ATA_EFLAG_IS_IO;
2295 trace_ata_eh_link_autopsy_qc(qc);
2298 /* enforce default EH actions */
2299 if (ap->pflags & ATA_PFLAG_FROZEN ||
2300 all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
2301 ehc->i.action |= ATA_EH_RESET;
2302 else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) ||
2303 (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV)))
2304 ehc->i.action |= ATA_EH_REVALIDATE;
2306 /* If we have offending qcs and the associated failed device,
2307 * perform per-dev EH action only on the offending device.
2310 ehc->i.dev_action[ehc->i.dev->devno] |=
2311 ehc->i.action & ATA_EH_PERDEV_MASK;
2312 ehc->i.action &= ~ATA_EH_PERDEV_MASK;
2315 /* propagate timeout to host link */
2316 if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link))
2317 ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT;
2319 /* record error and consider speeding down */
2321 if (!dev && ((ata_link_max_devices(link) == 1 &&
2322 ata_dev_enabled(link->device))))
2326 if (dev->flags & ATA_DFLAG_DUBIOUS_XFER)
2327 eflags |= ATA_EFLAG_DUBIOUS_XFER;
2328 ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
2330 trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask);
2335 * ata_eh_autopsy - analyze error and determine recovery action
2336 * @ap: host port to perform autopsy on
2338 * Analyze all links of @ap and determine why they failed and
2339 * which recovery actions are needed.
2342 * Kernel thread context (may sleep).
2344 void ata_eh_autopsy(struct ata_port *ap)
2346 struct ata_link *link;
2348 ata_for_each_link(link, ap, EDGE)
2349 ata_eh_link_autopsy(link);
2351 /* Handle the frigging slave link. Autopsy is done similarly
2352 * but actions and flags are transferred over to the master
2353 * link and handled from there.
2355 if (ap->slave_link) {
2356 struct ata_eh_context *mehc = &ap->link.eh_context;
2357 struct ata_eh_context *sehc = &ap->slave_link->eh_context;
2359 /* transfer control flags from master to slave */
2360 sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
2362 /* perform autopsy on the slave link */
2363 ata_eh_link_autopsy(ap->slave_link);
2365 /* transfer actions from slave to master and clear slave */
2366 ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2367 mehc->i.action |= sehc->i.action;
2368 mehc->i.dev_action[1] |= sehc->i.dev_action[1];
2369 mehc->i.flags |= sehc->i.flags;
2370 ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2373 /* Autopsy of fanout ports can affect host link autopsy.
2374 * Perform host link autopsy last.
2376 if (sata_pmp_attached(ap))
2377 ata_eh_link_autopsy(&ap->link);
2381 * ata_get_cmd_descript - get description for ATA command
2382 * @command: ATA command code to get description for
2384 * Return a textual description of the given command, or NULL if the
2385 * command is not known.
2390 const char *ata_get_cmd_descript(u8 command)
2392 #ifdef CONFIG_ATA_VERBOSE_ERROR
2398 { ATA_CMD_DEV_RESET, "DEVICE RESET" },
2399 { ATA_CMD_CHK_POWER, "CHECK POWER MODE" },
2400 { ATA_CMD_STANDBY, "STANDBY" },
2401 { ATA_CMD_IDLE, "IDLE" },
2402 { ATA_CMD_EDD, "EXECUTE DEVICE DIAGNOSTIC" },
2403 { ATA_CMD_DOWNLOAD_MICRO, "DOWNLOAD MICROCODE" },
2404 { ATA_CMD_DOWNLOAD_MICRO_DMA, "DOWNLOAD MICROCODE DMA" },
2405 { ATA_CMD_NOP, "NOP" },
2406 { ATA_CMD_FLUSH, "FLUSH CACHE" },
2407 { ATA_CMD_FLUSH_EXT, "FLUSH CACHE EXT" },
2408 { ATA_CMD_ID_ATA, "IDENTIFY DEVICE" },
2409 { ATA_CMD_ID_ATAPI, "IDENTIFY PACKET DEVICE" },
2410 { ATA_CMD_SERVICE, "SERVICE" },
2411 { ATA_CMD_READ, "READ DMA" },
2412 { ATA_CMD_READ_EXT, "READ DMA EXT" },
2413 { ATA_CMD_READ_QUEUED, "READ DMA QUEUED" },
2414 { ATA_CMD_READ_STREAM_EXT, "READ STREAM EXT" },
2415 { ATA_CMD_READ_STREAM_DMA_EXT, "READ STREAM DMA EXT" },
2416 { ATA_CMD_WRITE, "WRITE DMA" },
2417 { ATA_CMD_WRITE_EXT, "WRITE DMA EXT" },
2418 { ATA_CMD_WRITE_QUEUED, "WRITE DMA QUEUED EXT" },
2419 { ATA_CMD_WRITE_STREAM_EXT, "WRITE STREAM EXT" },
2420 { ATA_CMD_WRITE_STREAM_DMA_EXT, "WRITE STREAM DMA EXT" },
2421 { ATA_CMD_WRITE_FUA_EXT, "WRITE DMA FUA EXT" },
2422 { ATA_CMD_WRITE_QUEUED_FUA_EXT, "WRITE DMA QUEUED FUA EXT" },
2423 { ATA_CMD_FPDMA_READ, "READ FPDMA QUEUED" },
2424 { ATA_CMD_FPDMA_WRITE, "WRITE FPDMA QUEUED" },
2425 { ATA_CMD_FPDMA_SEND, "SEND FPDMA QUEUED" },
2426 { ATA_CMD_FPDMA_RECV, "RECEIVE FPDMA QUEUED" },
2427 { ATA_CMD_PIO_READ, "READ SECTOR(S)" },
2428 { ATA_CMD_PIO_READ_EXT, "READ SECTOR(S) EXT" },
2429 { ATA_CMD_PIO_WRITE, "WRITE SECTOR(S)" },
2430 { ATA_CMD_PIO_WRITE_EXT, "WRITE SECTOR(S) EXT" },
2431 { ATA_CMD_READ_MULTI, "READ MULTIPLE" },
2432 { ATA_CMD_READ_MULTI_EXT, "READ MULTIPLE EXT" },
2433 { ATA_CMD_WRITE_MULTI, "WRITE MULTIPLE" },
2434 { ATA_CMD_WRITE_MULTI_EXT, "WRITE MULTIPLE EXT" },
2435 { ATA_CMD_WRITE_MULTI_FUA_EXT, "WRITE MULTIPLE FUA EXT" },
2436 { ATA_CMD_SET_FEATURES, "SET FEATURES" },
2437 { ATA_CMD_SET_MULTI, "SET MULTIPLE MODE" },
2438 { ATA_CMD_VERIFY, "READ VERIFY SECTOR(S)" },
2439 { ATA_CMD_VERIFY_EXT, "READ VERIFY SECTOR(S) EXT" },
2440 { ATA_CMD_WRITE_UNCORR_EXT, "WRITE UNCORRECTABLE EXT" },
2441 { ATA_CMD_STANDBYNOW1, "STANDBY IMMEDIATE" },
2442 { ATA_CMD_IDLEIMMEDIATE, "IDLE IMMEDIATE" },
2443 { ATA_CMD_SLEEP, "SLEEP" },
2444 { ATA_CMD_INIT_DEV_PARAMS, "INITIALIZE DEVICE PARAMETERS" },
2445 { ATA_CMD_READ_NATIVE_MAX, "READ NATIVE MAX ADDRESS" },
2446 { ATA_CMD_READ_NATIVE_MAX_EXT, "READ NATIVE MAX ADDRESS EXT" },
2447 { ATA_CMD_SET_MAX, "SET MAX ADDRESS" },
2448 { ATA_CMD_SET_MAX_EXT, "SET MAX ADDRESS EXT" },
2449 { ATA_CMD_READ_LOG_EXT, "READ LOG EXT" },
2450 { ATA_CMD_WRITE_LOG_EXT, "WRITE LOG EXT" },
2451 { ATA_CMD_READ_LOG_DMA_EXT, "READ LOG DMA EXT" },
2452 { ATA_CMD_WRITE_LOG_DMA_EXT, "WRITE LOG DMA EXT" },
2453 { ATA_CMD_TRUSTED_NONDATA, "TRUSTED NON-DATA" },
2454 { ATA_CMD_TRUSTED_RCV, "TRUSTED RECEIVE" },
2455 { ATA_CMD_TRUSTED_RCV_DMA, "TRUSTED RECEIVE DMA" },
2456 { ATA_CMD_TRUSTED_SND, "TRUSTED SEND" },
2457 { ATA_CMD_TRUSTED_SND_DMA, "TRUSTED SEND DMA" },
2458 { ATA_CMD_PMP_READ, "READ BUFFER" },
2459 { ATA_CMD_PMP_READ_DMA, "READ BUFFER DMA" },
2460 { ATA_CMD_PMP_WRITE, "WRITE BUFFER" },
2461 { ATA_CMD_PMP_WRITE_DMA, "WRITE BUFFER DMA" },
2462 { ATA_CMD_CONF_OVERLAY, "DEVICE CONFIGURATION OVERLAY" },
2463 { ATA_CMD_SEC_SET_PASS, "SECURITY SET PASSWORD" },
2464 { ATA_CMD_SEC_UNLOCK, "SECURITY UNLOCK" },
2465 { ATA_CMD_SEC_ERASE_PREP, "SECURITY ERASE PREPARE" },
2466 { ATA_CMD_SEC_ERASE_UNIT, "SECURITY ERASE UNIT" },
2467 { ATA_CMD_SEC_FREEZE_LOCK, "SECURITY FREEZE LOCK" },
2468 { ATA_CMD_SEC_DISABLE_PASS, "SECURITY DISABLE PASSWORD" },
2469 { ATA_CMD_CONFIG_STREAM, "CONFIGURE STREAM" },
2470 { ATA_CMD_SMART, "SMART" },
2471 { ATA_CMD_MEDIA_LOCK, "DOOR LOCK" },
2472 { ATA_CMD_MEDIA_UNLOCK, "DOOR UNLOCK" },
2473 { ATA_CMD_DSM, "DATA SET MANAGEMENT" },
2474 { ATA_CMD_CHK_MED_CRD_TYP, "CHECK MEDIA CARD TYPE" },
2475 { ATA_CMD_CFA_REQ_EXT_ERR, "CFA REQUEST EXTENDED ERROR" },
2476 { ATA_CMD_CFA_WRITE_NE, "CFA WRITE SECTORS WITHOUT ERASE" },
2477 { ATA_CMD_CFA_TRANS_SECT, "CFA TRANSLATE SECTOR" },
2478 { ATA_CMD_CFA_ERASE, "CFA ERASE SECTORS" },
2479 { ATA_CMD_CFA_WRITE_MULT_NE, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2480 { ATA_CMD_REQ_SENSE_DATA, "REQUEST SENSE DATA EXT" },
2481 { ATA_CMD_SANITIZE_DEVICE, "SANITIZE DEVICE" },
2482 { ATA_CMD_READ_LONG, "READ LONG (with retries)" },
2483 { ATA_CMD_READ_LONG_ONCE, "READ LONG (without retries)" },
2484 { ATA_CMD_WRITE_LONG, "WRITE LONG (with retries)" },
2485 { ATA_CMD_WRITE_LONG_ONCE, "WRITE LONG (without retries)" },
2486 { ATA_CMD_RESTORE, "RECALIBRATE" },
2487 { 0, NULL } /* terminate list */
2491 for (i = 0; cmd_descr[i].text; i++)
2492 if (cmd_descr[i].command == command)
2493 return cmd_descr[i].text;
2498 EXPORT_SYMBOL_GPL(ata_get_cmd_descript);
2501 * ata_eh_link_report - report error handling to user
2502 * @link: ATA link EH is going on
2504 * Report EH to user.
2509 static void ata_eh_link_report(struct ata_link *link)
2511 struct ata_port *ap = link->ap;
2512 struct ata_eh_context *ehc = &link->eh_context;
2513 const char *frozen, *desc;
2514 char tries_buf[6] = "";
2515 int tag, nr_failed = 0;
2517 if (ehc->i.flags & ATA_EHI_QUIET)
2521 if (ehc->i.desc[0] != '\0')
2524 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2525 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2527 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2528 ata_dev_phys_link(qc->dev) != link ||
2529 ((qc->flags & ATA_QCFLAG_QUIET) &&
2530 qc->err_mask == AC_ERR_DEV))
2532 if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
2538 if (!nr_failed && !ehc->i.err_mask)
2542 if (ap->pflags & ATA_PFLAG_FROZEN)
2545 if (ap->eh_tries < ATA_EH_MAX_TRIES)
2546 snprintf(tries_buf, sizeof(tries_buf), " t%d",
2550 ata_dev_err(ehc->i.dev, "exception Emask 0x%x "
2551 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2552 ehc->i.err_mask, link->sactive, ehc->i.serror,
2553 ehc->i.action, frozen, tries_buf);
2555 ata_dev_err(ehc->i.dev, "%s\n", desc);
2557 ata_link_err(link, "exception Emask 0x%x "
2558 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2559 ehc->i.err_mask, link->sactive, ehc->i.serror,
2560 ehc->i.action, frozen, tries_buf);
2562 ata_link_err(link, "%s\n", desc);
2565 #ifdef CONFIG_ATA_VERBOSE_ERROR
2568 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2569 ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "",
2570 ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "",
2571 ehc->i.serror & SERR_DATA ? "UnrecovData " : "",
2572 ehc->i.serror & SERR_PERSISTENT ? "Persist " : "",
2573 ehc->i.serror & SERR_PROTOCOL ? "Proto " : "",
2574 ehc->i.serror & SERR_INTERNAL ? "HostInt " : "",
2575 ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "",
2576 ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "",
2577 ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "",
2578 ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "",
2579 ehc->i.serror & SERR_DISPARITY ? "Dispar " : "",
2580 ehc->i.serror & SERR_CRC ? "BadCRC " : "",
2581 ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "",
2582 ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "",
2583 ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "",
2584 ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "",
2585 ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : "");
2588 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2589 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2590 struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
2591 char data_buf[20] = "";
2592 char cdb_buf[70] = "";
2594 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2595 ata_dev_phys_link(qc->dev) != link || !qc->err_mask)
2598 if (qc->dma_dir != DMA_NONE) {
2599 static const char *dma_str[] = {
2600 [DMA_BIDIRECTIONAL] = "bidi",
2601 [DMA_TO_DEVICE] = "out",
2602 [DMA_FROM_DEVICE] = "in",
2604 static const char *prot_str[] = {
2605 [ATA_PROT_PIO] = "pio",
2606 [ATA_PROT_DMA] = "dma",
2607 [ATA_PROT_NCQ] = "ncq",
2608 [ATAPI_PROT_PIO] = "pio",
2609 [ATAPI_PROT_DMA] = "dma",
2612 snprintf(data_buf, sizeof(data_buf), " %s %u %s",
2613 prot_str[qc->tf.protocol], qc->nbytes,
2614 dma_str[qc->dma_dir]);
2617 if (ata_is_atapi(qc->tf.protocol)) {
2618 const u8 *cdb = qc->cdb;
2619 size_t cdb_len = qc->dev->cdb_len;
2622 cdb = qc->scsicmd->cmnd;
2623 cdb_len = qc->scsicmd->cmd_len;
2625 __scsi_format_command(cdb_buf, sizeof(cdb_buf),
2628 const char *descr = ata_get_cmd_descript(cmd->command);
2630 ata_dev_err(qc->dev, "failed command: %s\n",
2634 ata_dev_err(qc->dev,
2635 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2637 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2638 "Emask 0x%x (%s)%s\n",
2639 cmd->command, cmd->feature, cmd->nsect,
2640 cmd->lbal, cmd->lbam, cmd->lbah,
2641 cmd->hob_feature, cmd->hob_nsect,
2642 cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,
2643 cmd->device, qc->tag, data_buf, cdb_buf,
2644 res->command, res->feature, res->nsect,
2645 res->lbal, res->lbam, res->lbah,
2646 res->hob_feature, res->hob_nsect,
2647 res->hob_lbal, res->hob_lbam, res->hob_lbah,
2648 res->device, qc->err_mask, ata_err_string(qc->err_mask),
2649 qc->err_mask & AC_ERR_NCQ ? " <F>" : "");
2651 #ifdef CONFIG_ATA_VERBOSE_ERROR
2652 if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ |
2653 ATA_SENSE | ATA_ERR)) {
2654 if (res->command & ATA_BUSY)
2655 ata_dev_err(qc->dev, "status: { Busy }\n");
2657 ata_dev_err(qc->dev, "status: { %s%s%s%s%s}\n",
2658 res->command & ATA_DRDY ? "DRDY " : "",
2659 res->command & ATA_DF ? "DF " : "",
2660 res->command & ATA_DRQ ? "DRQ " : "",
2661 res->command & ATA_SENSE ? "SENSE " : "",
2662 res->command & ATA_ERR ? "ERR " : "");
2665 if (cmd->command != ATA_CMD_PACKET &&
2666 (res->feature & (ATA_ICRC | ATA_UNC | ATA_AMNF |
2667 ATA_IDNF | ATA_ABORTED)))
2668 ata_dev_err(qc->dev, "error: { %s%s%s%s%s}\n",
2669 res->feature & ATA_ICRC ? "ICRC " : "",
2670 res->feature & ATA_UNC ? "UNC " : "",
2671 res->feature & ATA_AMNF ? "AMNF " : "",
2672 res->feature & ATA_IDNF ? "IDNF " : "",
2673 res->feature & ATA_ABORTED ? "ABRT " : "");
2679 * ata_eh_report - report error handling to user
2680 * @ap: ATA port to report EH about
2682 * Report EH to user.
2687 void ata_eh_report(struct ata_port *ap)
2689 struct ata_link *link;
2691 ata_for_each_link(link, ap, HOST_FIRST)
2692 ata_eh_link_report(link);
2695 static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
2696 unsigned int *classes, unsigned long deadline,
2699 struct ata_device *dev;
2702 ata_for_each_dev(dev, link, ALL)
2703 classes[dev->devno] = ATA_DEV_UNKNOWN;
2705 return reset(link, classes, deadline);
2708 static int ata_eh_followup_srst_needed(struct ata_link *link, int rc)
2710 if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link))
2714 if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
2719 int ata_eh_reset(struct ata_link *link, int classify,
2720 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
2721 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
2723 struct ata_port *ap = link->ap;
2724 struct ata_link *slave = ap->slave_link;
2725 struct ata_eh_context *ehc = &link->eh_context;
2726 struct ata_eh_context *sehc = slave ? &slave->eh_context : NULL;
2727 unsigned int *classes = ehc->classes;
2728 unsigned int lflags = link->flags;
2729 int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
2730 int max_tries = 0, try = 0;
2731 struct ata_link *failed_link;
2732 struct ata_device *dev;
2733 unsigned long deadline, now;
2734 ata_reset_fn_t reset;
2735 unsigned long flags;
2742 while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
2744 if (link->flags & ATA_LFLAG_RST_ONCE)
2746 if (link->flags & ATA_LFLAG_NO_HRST)
2748 if (link->flags & ATA_LFLAG_NO_SRST)
2751 /* make sure each reset attempt is at least COOL_DOWN apart */
2752 if (ehc->i.flags & ATA_EHI_DID_RESET) {
2754 WARN_ON(time_after(ehc->last_reset, now));
2755 deadline = ata_deadline(ehc->last_reset,
2756 ATA_EH_RESET_COOL_DOWN);
2757 if (time_before(now, deadline))
2758 schedule_timeout_uninterruptible(deadline - now);
2761 spin_lock_irqsave(ap->lock, flags);
2762 ap->pflags |= ATA_PFLAG_RESETTING;
2763 spin_unlock_irqrestore(ap->lock, flags);
2765 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
2767 ata_for_each_dev(dev, link, ALL) {
2768 /* If we issue an SRST then an ATA drive (not ATAPI)
2769 * may change configuration and be in PIO0 timing. If
2770 * we do a hard reset (or are coming from power on)
2771 * this is true for ATA or ATAPI. Until we've set a
2772 * suitable controller mode we should not touch the
2773 * bus as we may be talking too fast.
2775 dev->pio_mode = XFER_PIO_0;
2776 dev->dma_mode = 0xff;
2778 /* If the controller has a pio mode setup function
2779 * then use it to set the chipset to rights. Don't
2780 * touch the DMA setup as that will be dealt with when
2781 * configuring devices.
2783 if (ap->ops->set_piomode)
2784 ap->ops->set_piomode(ap, dev);
2787 /* prefer hardreset */
2789 ehc->i.action &= ~ATA_EH_RESET;
2792 ehc->i.action |= ATA_EH_HARDRESET;
2793 } else if (softreset) {
2795 ehc->i.action |= ATA_EH_SOFTRESET;
2799 unsigned long deadline = ata_deadline(jiffies,
2800 ATA_EH_PRERESET_TIMEOUT);
2803 sehc->i.action &= ~ATA_EH_RESET;
2804 sehc->i.action |= ehc->i.action;
2807 rc = prereset(link, deadline);
2809 /* If present, do prereset on slave link too. Reset
2810 * is skipped iff both master and slave links report
2811 * -ENOENT or clear ATA_EH_RESET.
2813 if (slave && (rc == 0 || rc == -ENOENT)) {
2816 tmp = prereset(slave, deadline);
2820 ehc->i.action |= sehc->i.action;
2824 if (rc == -ENOENT) {
2825 ata_link_dbg(link, "port disabled--ignoring\n");
2826 ehc->i.action &= ~ATA_EH_RESET;
2828 ata_for_each_dev(dev, link, ALL)
2829 classes[dev->devno] = ATA_DEV_NONE;
2834 "prereset failed (errno=%d)\n",
2839 /* prereset() might have cleared ATA_EH_RESET. If so,
2840 * bang classes, thaw and return.
2842 if (reset && !(ehc->i.action & ATA_EH_RESET)) {
2843 ata_for_each_dev(dev, link, ALL)
2844 classes[dev->devno] = ATA_DEV_NONE;
2845 if ((ap->pflags & ATA_PFLAG_FROZEN) &&
2846 ata_is_host_link(link))
2847 ata_eh_thaw_port(ap);
2857 if (ata_is_host_link(link))
2858 ata_eh_freeze_port(ap);
2860 deadline = ata_deadline(jiffies, ata_eh_reset_timeouts[try++]);
2864 ata_link_info(link, "%s resetting link\n",
2865 reset == softreset ? "soft" : "hard");
2867 /* mark that this EH session started with reset */
2868 ehc->last_reset = jiffies;
2869 if (reset == hardreset)
2870 ehc->i.flags |= ATA_EHI_DID_HARDRESET;
2872 ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
2874 rc = ata_do_reset(link, reset, classes, deadline, true);
2875 if (rc && rc != -EAGAIN) {
2880 /* hardreset slave link if existent */
2881 if (slave && reset == hardreset) {
2885 ata_link_info(slave, "hard resetting link\n");
2887 ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
2888 tmp = ata_do_reset(slave, reset, classes, deadline,
2896 failed_link = slave;
2902 /* perform follow-up SRST if necessary */
2903 if (reset == hardreset &&
2904 ata_eh_followup_srst_needed(link, rc)) {
2909 "follow-up softreset required but no softreset available\n");
2915 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
2916 rc = ata_do_reset(link, reset, classes, deadline, true);
2925 "no reset method available, skipping reset\n");
2926 if (!(lflags & ATA_LFLAG_ASSUME_CLASS))
2927 lflags |= ATA_LFLAG_ASSUME_ATA;
2931 * Post-reset processing
2933 ata_for_each_dev(dev, link, ALL) {
2934 /* After the reset, the device state is PIO 0 and the
2935 * controller state is undefined. Reset also wakes up
2936 * drives from sleeping mode.
2938 dev->pio_mode = XFER_PIO_0;
2939 dev->flags &= ~ATA_DFLAG_SLEEPING;
2941 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
2944 /* apply class override */
2945 if (lflags & ATA_LFLAG_ASSUME_ATA)
2946 classes[dev->devno] = ATA_DEV_ATA;
2947 else if (lflags & ATA_LFLAG_ASSUME_SEMB)
2948 classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
2951 /* record current link speed */
2952 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
2953 link->sata_spd = (sstatus >> 4) & 0xf;
2954 if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0)
2955 slave->sata_spd = (sstatus >> 4) & 0xf;
2958 if (ata_is_host_link(link))
2959 ata_eh_thaw_port(ap);
2961 /* postreset() should clear hardware SError. Although SError
2962 * is cleared during link resume, clearing SError here is
2963 * necessary as some PHYs raise hotplug events after SRST.
2964 * This introduces race condition where hotplug occurs between
2965 * reset and here. This race is mediated by cross checking
2966 * link onlineness and classification result later.
2969 postreset(link, classes);
2971 postreset(slave, classes);
2975 * Some controllers can't be frozen very well and may set spurious
2976 * error conditions during reset. Clear accumulated error
2977 * information and re-thaw the port if frozen. As reset is the
2978 * final recovery action and we cross check link onlineness against
2979 * device classification later, no hotplug event is lost by this.
2981 spin_lock_irqsave(link->ap->lock, flags);
2982 memset(&link->eh_info, 0, sizeof(link->eh_info));
2984 memset(&slave->eh_info, 0, sizeof(link->eh_info));
2985 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
2986 spin_unlock_irqrestore(link->ap->lock, flags);
2988 if (ap->pflags & ATA_PFLAG_FROZEN)
2989 ata_eh_thaw_port(ap);
2992 * Make sure onlineness and classification result correspond.
2993 * Hotplug could have happened during reset and some
2994 * controllers fail to wait while a drive is spinning up after
2995 * being hotplugged causing misdetection. By cross checking
2996 * link on/offlineness and classification result, those
2997 * conditions can be reliably detected and retried.
3000 ata_for_each_dev(dev, link, ALL) {
3001 if (ata_phys_link_online(ata_dev_phys_link(dev))) {
3002 if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
3003 ata_dev_dbg(dev, "link online but device misclassified\n");
3004 classes[dev->devno] = ATA_DEV_NONE;
3007 } else if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
3008 if (ata_class_enabled(classes[dev->devno]))
3010 "link offline, clearing class %d to NONE\n",
3011 classes[dev->devno]);
3012 classes[dev->devno] = ATA_DEV_NONE;
3013 } else if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
3015 "link status unknown, clearing UNKNOWN to NONE\n");
3016 classes[dev->devno] = ATA_DEV_NONE;
3020 if (classify && nr_unknown) {
3021 if (try < max_tries) {
3023 "link online but %d devices misclassified, retrying\n",
3030 "link online but %d devices misclassified, "
3031 "device detection might fail\n", nr_unknown);
3034 /* reset successful, schedule revalidation */
3035 ata_eh_done(link, NULL, ATA_EH_RESET);
3037 ata_eh_done(slave, NULL, ATA_EH_RESET);
3038 ehc->last_reset = jiffies; /* update to completion time */
3039 ehc->i.action |= ATA_EH_REVALIDATE;
3040 link->lpm_policy = ATA_LPM_UNKNOWN; /* reset LPM state */
3044 /* clear hotplug flag */
3045 ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
3047 sehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
3049 spin_lock_irqsave(ap->lock, flags);
3050 ap->pflags &= ~ATA_PFLAG_RESETTING;
3051 spin_unlock_irqrestore(ap->lock, flags);
3056 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
3057 if (!ata_is_host_link(link) &&
3058 sata_scr_read(link, SCR_STATUS, &sstatus))
3061 if (try >= max_tries) {
3063 * Thaw host port even if reset failed, so that the port
3064 * can be retried on the next phy event. This risks
3065 * repeated EH runs but seems to be a better tradeoff than
3066 * shutting down a port after a botched hotplug attempt.
3068 if (ata_is_host_link(link))
3069 ata_eh_thaw_port(ap);
3074 if (time_before(now, deadline)) {
3075 unsigned long delta = deadline - now;
3077 ata_link_warn(failed_link,
3078 "reset failed (errno=%d), retrying in %u secs\n",
3079 rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
3083 delta = schedule_timeout_uninterruptible(delta);
3088 * While disks spinup behind PMP, some controllers fail sending SRST.
3089 * They need to be reset - as well as the PMP - before retrying.
3091 if (rc == -ERESTART) {
3092 if (ata_is_host_link(link))
3093 ata_eh_thaw_port(ap);
3097 if (try == max_tries - 1) {
3098 sata_down_spd_limit(link, 0);
3100 sata_down_spd_limit(slave, 0);
3101 } else if (rc == -EPIPE)
3102 sata_down_spd_limit(failed_link, 0);
3109 static inline void ata_eh_pull_park_action(struct ata_port *ap)
3111 struct ata_link *link;
3112 struct ata_device *dev;
3113 unsigned long flags;
3116 * This function can be thought of as an extended version of
3117 * ata_eh_about_to_do() specially crafted to accommodate the
3118 * requirements of ATA_EH_PARK handling. Since the EH thread
3119 * does not leave the do {} while () loop in ata_eh_recover as
3120 * long as the timeout for a park request to *one* device on
3121 * the port has not expired, and since we still want to pick
3122 * up park requests to other devices on the same port or
3123 * timeout updates for the same device, we have to pull
3124 * ATA_EH_PARK actions from eh_info into eh_context.i
3125 * ourselves at the beginning of each pass over the loop.
3127 * Additionally, all write accesses to &ap->park_req_pending
3128 * through reinit_completion() (see below) or complete_all()
3129 * (see ata_scsi_park_store()) are protected by the host lock.
3130 * As a result we have that park_req_pending.done is zero on
3131 * exit from this function, i.e. when ATA_EH_PARK actions for
3132 * *all* devices on port ap have been pulled into the
3133 * respective eh_context structs. If, and only if,
3134 * park_req_pending.done is non-zero by the time we reach
3135 * wait_for_completion_timeout(), another ATA_EH_PARK action
3136 * has been scheduled for at least one of the devices on port
3137 * ap and we have to cycle over the do {} while () loop in
3138 * ata_eh_recover() again.
3141 spin_lock_irqsave(ap->lock, flags);
3142 reinit_completion(&ap->park_req_pending);
3143 ata_for_each_link(link, ap, EDGE) {
3144 ata_for_each_dev(dev, link, ALL) {
3145 struct ata_eh_info *ehi = &link->eh_info;
3147 link->eh_context.i.dev_action[dev->devno] |=
3148 ehi->dev_action[dev->devno] & ATA_EH_PARK;
3149 ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK);
3152 spin_unlock_irqrestore(ap->lock, flags);
3155 static void ata_eh_park_issue_cmd(struct ata_device *dev, int park)
3157 struct ata_eh_context *ehc = &dev->link->eh_context;
3158 struct ata_taskfile tf;
3159 unsigned int err_mask;
3161 ata_tf_init(dev, &tf);
3163 ehc->unloaded_mask |= 1 << dev->devno;
3164 tf.command = ATA_CMD_IDLEIMMEDIATE;
3170 ehc->unloaded_mask &= ~(1 << dev->devno);
3171 tf.command = ATA_CMD_CHK_POWER;
3174 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3175 tf.protocol |= ATA_PROT_NODATA;
3176 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3177 if (park && (err_mask || tf.lbal != 0xc4)) {
3178 ata_dev_err(dev, "head unload failed!\n");
3179 ehc->unloaded_mask &= ~(1 << dev->devno);
3183 static int ata_eh_revalidate_and_attach(struct ata_link *link,
3184 struct ata_device **r_failed_dev)
3186 struct ata_port *ap = link->ap;
3187 struct ata_eh_context *ehc = &link->eh_context;
3188 struct ata_device *dev;
3189 unsigned int new_mask = 0;
3190 unsigned long flags;
3195 /* For PATA drive side cable detection to work, IDENTIFY must
3196 * be done backwards such that PDIAG- is released by the slave
3197 * device before the master device is identified.
3199 ata_for_each_dev(dev, link, ALL_REVERSE) {
3200 unsigned int action = ata_eh_dev_action(dev);
3201 unsigned int readid_flags = 0;
3203 if (ehc->i.flags & ATA_EHI_DID_RESET)
3204 readid_flags |= ATA_READID_POSTRESET;
3206 if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
3207 WARN_ON(dev->class == ATA_DEV_PMP);
3209 if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
3214 ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE);
3215 rc = ata_dev_revalidate(dev, ehc->classes[dev->devno],
3220 ata_eh_done(link, dev, ATA_EH_REVALIDATE);
3222 /* Configuration may have changed, reconfigure
3225 ehc->i.flags |= ATA_EHI_SETMODE;
3227 /* schedule the scsi_rescan_device() here */
3228 schedule_work(&(ap->scsi_rescan_task));
3229 } else if (dev->class == ATA_DEV_UNKNOWN &&
3230 ehc->tries[dev->devno] &&
3231 ata_class_enabled(ehc->classes[dev->devno])) {
3232 /* Temporarily set dev->class, it will be
3233 * permanently set once all configurations are
3234 * complete. This is necessary because new
3235 * device configuration is done in two
3238 dev->class = ehc->classes[dev->devno];
3240 if (dev->class == ATA_DEV_PMP)
3241 rc = sata_pmp_attach(dev);
3243 rc = ata_dev_read_id(dev, &dev->class,
3244 readid_flags, dev->id);
3246 /* read_id might have changed class, store and reset */
3247 ehc->classes[dev->devno] = dev->class;
3248 dev->class = ATA_DEV_UNKNOWN;
3252 /* clear error info accumulated during probe */
3253 ata_ering_clear(&dev->ering);
3254 new_mask |= 1 << dev->devno;
3257 /* IDENTIFY was issued to non-existent
3258 * device. No need to reset. Just
3259 * thaw and ignore the device.
3261 ata_eh_thaw_port(ap);
3269 /* PDIAG- should have been released, ask cable type if post-reset */
3270 if ((ehc->i.flags & ATA_EHI_DID_RESET) && ata_is_host_link(link)) {
3271 if (ap->ops->cable_detect)
3272 ap->cbl = ap->ops->cable_detect(ap);
3276 /* Configure new devices forward such that user doesn't see
3277 * device detection messages backwards.
3279 ata_for_each_dev(dev, link, ALL) {
3280 if (!(new_mask & (1 << dev->devno)))
3283 dev->class = ehc->classes[dev->devno];
3285 if (dev->class == ATA_DEV_PMP)
3288 ehc->i.flags |= ATA_EHI_PRINTINFO;
3289 rc = ata_dev_configure(dev);
3290 ehc->i.flags &= ~ATA_EHI_PRINTINFO;
3292 dev->class = ATA_DEV_UNKNOWN;
3296 spin_lock_irqsave(ap->lock, flags);
3297 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
3298 spin_unlock_irqrestore(ap->lock, flags);
3300 /* new device discovered, configure xfermode */
3301 ehc->i.flags |= ATA_EHI_SETMODE;
3307 *r_failed_dev = dev;
3308 DPRINTK("EXIT rc=%d\n", rc);
3313 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3314 * @link: link on which timings will be programmed
3315 * @r_failed_dev: out parameter for failed device
3317 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3318 * ata_set_mode() fails, pointer to the failing device is
3319 * returned in @r_failed_dev.
3322 * PCI/etc. bus probe sem.
3325 * 0 on success, negative errno otherwise
3327 int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3329 struct ata_port *ap = link->ap;
3330 struct ata_device *dev;
3333 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
3334 ata_for_each_dev(dev, link, ENABLED) {
3335 if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) {
3336 struct ata_ering_entry *ent;
3338 ent = ata_ering_top(&dev->ering);
3340 ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER;
3344 /* has private set_mode? */
3345 if (ap->ops->set_mode)
3346 rc = ap->ops->set_mode(link, r_failed_dev);
3348 rc = ata_do_set_mode(link, r_failed_dev);
3350 /* if transfer mode has changed, set DUBIOUS_XFER on device */
3351 ata_for_each_dev(dev, link, ENABLED) {
3352 struct ata_eh_context *ehc = &link->eh_context;
3353 u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
3354 u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
3356 if (dev->xfer_mode != saved_xfer_mode ||
3357 ata_ncq_enabled(dev) != saved_ncq)
3358 dev->flags |= ATA_DFLAG_DUBIOUS_XFER;
3365 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3366 * @dev: ATAPI device to clear UA for
3368 * Resets and other operations can make an ATAPI device raise
3369 * UNIT ATTENTION which causes the next operation to fail. This
3370 * function clears UA.
3373 * EH context (may sleep).
3376 * 0 on success, -errno on failure.
3378 static int atapi_eh_clear_ua(struct ata_device *dev)
3382 for (i = 0; i < ATA_EH_UA_TRIES; i++) {
3383 u8 *sense_buffer = dev->link->ap->sector_buf;
3385 unsigned int err_mask;
3387 err_mask = atapi_eh_tur(dev, &sense_key);
3388 if (err_mask != 0 && err_mask != AC_ERR_DEV) {
3390 "TEST_UNIT_READY failed (err_mask=0x%x)\n",
3395 if (!err_mask || sense_key != UNIT_ATTENTION)
3398 err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
3400 ata_dev_warn(dev, "failed to clear "
3401 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
3406 ata_dev_warn(dev, "UNIT ATTENTION persists after %d tries\n",
3413 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3414 * @dev: ATA device which may need FLUSH retry
3416 * If @dev failed FLUSH, it needs to be reported upper layer
3417 * immediately as it means that @dev failed to remap and already
3418 * lost at least a sector and further FLUSH retrials won't make
3419 * any difference to the lost sector. However, if FLUSH failed
3420 * for other reasons, for example transmission error, FLUSH needs
3423 * This function determines whether FLUSH failure retry is
3424 * necessary and performs it if so.
3427 * 0 if EH can continue, -errno if EH needs to be repeated.
3429 static int ata_eh_maybe_retry_flush(struct ata_device *dev)
3431 struct ata_link *link = dev->link;
3432 struct ata_port *ap = link->ap;
3433 struct ata_queued_cmd *qc;
3434 struct ata_taskfile tf;
3435 unsigned int err_mask;
3438 /* did flush fail for this device? */
3439 if (!ata_tag_valid(link->active_tag))
3442 qc = __ata_qc_from_tag(ap, link->active_tag);
3443 if (qc->dev != dev || (qc->tf.command != ATA_CMD_FLUSH_EXT &&
3444 qc->tf.command != ATA_CMD_FLUSH))
3447 /* if the device failed it, it should be reported to upper layers */
3448 if (qc->err_mask & AC_ERR_DEV)
3451 /* flush failed for some other reason, give it another shot */
3452 ata_tf_init(dev, &tf);
3454 tf.command = qc->tf.command;
3455 tf.flags |= ATA_TFLAG_DEVICE;
3456 tf.protocol = ATA_PROT_NODATA;
3458 ata_dev_warn(dev, "retrying FLUSH 0x%x Emask 0x%x\n",
3459 tf.command, qc->err_mask);
3461 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3464 * FLUSH is complete but there's no way to
3465 * successfully complete a failed command from EH.
3466 * Making sure retry is allowed at least once and
3467 * retrying it should do the trick - whatever was in
3468 * the cache is already on the platter and this won't
3469 * cause infinite loop.
3471 qc->scsicmd->allowed = max(qc->scsicmd->allowed, 1);
3473 ata_dev_warn(dev, "FLUSH failed Emask 0x%x\n",
3477 /* if device failed it, report it to upper layers */
3478 if (err_mask & AC_ERR_DEV) {
3479 qc->err_mask |= AC_ERR_DEV;
3481 if (!(ap->pflags & ATA_PFLAG_FROZEN))
3489 * ata_eh_set_lpm - configure SATA interface power management
3490 * @link: link to configure power management
3491 * @policy: the link power management policy
3492 * @r_failed_dev: out parameter for failed device
3494 * Enable SATA Interface power management. This will enable
3495 * Device Interface Power Management (DIPM) for min_power
3496 * policy, and then call driver specific callbacks for
3497 * enabling Host Initiated Power management.
3503 * 0 on success, -errno on failure.
3505 static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3506 struct ata_device **r_failed_dev)
3508 struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
3509 struct ata_eh_context *ehc = &link->eh_context;
3510 struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
3511 enum ata_lpm_policy old_policy = link->lpm_policy;
3512 bool no_dipm = link->ap->flags & ATA_FLAG_NO_DIPM;
3513 unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
3514 unsigned int err_mask;
3517 /* if the link or host doesn't do LPM, noop */
3518 if ((link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
3522 * DIPM is enabled only for MIN_POWER as some devices
3523 * misbehave when the host NACKs transition to SLUMBER. Order
3524 * device and link configurations such that the host always
3525 * allows DIPM requests.
3527 ata_for_each_dev(dev, link, ENABLED) {
3528 bool hipm = ata_id_has_hipm(dev->id);
3529 bool dipm = ata_id_has_dipm(dev->id) && !no_dipm;
3531 /* find the first enabled and LPM enabled devices */
3535 if (!lpm_dev && (hipm || dipm))
3538 hints &= ~ATA_LPM_EMPTY;
3540 hints &= ~ATA_LPM_HIPM;
3542 /* disable DIPM before changing link config */
3543 if (policy != ATA_LPM_MIN_POWER && dipm) {
3544 err_mask = ata_dev_set_feature(dev,
3545 SETFEATURES_SATA_DISABLE, SATA_DIPM);
3546 if (err_mask && err_mask != AC_ERR_DEV) {
3548 "failed to disable DIPM, Emask 0x%x\n",
3557 rc = ap->ops->set_lpm(link, policy, hints);
3558 if (!rc && ap->slave_link)
3559 rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
3561 rc = sata_pmp_set_lpm(link, policy, hints);
3564 * Attribute link config failure to the first (LPM) enabled
3565 * device on the link.
3568 if (rc == -EOPNOTSUPP) {
3569 link->flags |= ATA_LFLAG_NO_LPM;
3572 dev = lpm_dev ? lpm_dev : link_dev;
3577 * Low level driver acked the transition. Issue DIPM command
3578 * with the new policy set.
3580 link->lpm_policy = policy;
3581 if (ap && ap->slave_link)
3582 ap->slave_link->lpm_policy = policy;
3584 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3585 ata_for_each_dev(dev, link, ENABLED) {
3586 if (policy == ATA_LPM_MIN_POWER && !no_dipm &&
3587 ata_id_has_dipm(dev->id)) {
3588 err_mask = ata_dev_set_feature(dev,
3589 SETFEATURES_SATA_ENABLE, SATA_DIPM);
3590 if (err_mask && err_mask != AC_ERR_DEV) {
3592 "failed to enable DIPM, Emask 0x%x\n",
3600 link->last_lpm_change = jiffies;
3601 link->flags |= ATA_LFLAG_CHANGED;
3606 /* restore the old policy */
3607 link->lpm_policy = old_policy;
3608 if (ap && ap->slave_link)
3609 ap->slave_link->lpm_policy = old_policy;
3611 /* if no device or only one more chance is left, disable LPM */
3612 if (!dev || ehc->tries[dev->devno] <= 2) {
3613 ata_link_warn(link, "disabling LPM on the link\n");
3614 link->flags |= ATA_LFLAG_NO_LPM;
3617 *r_failed_dev = dev;
3621 int ata_link_nr_enabled(struct ata_link *link)
3623 struct ata_device *dev;
3626 ata_for_each_dev(dev, link, ENABLED)
3631 static int ata_link_nr_vacant(struct ata_link *link)
3633 struct ata_device *dev;
3636 ata_for_each_dev(dev, link, ALL)
3637 if (dev->class == ATA_DEV_UNKNOWN)
3642 static int ata_eh_skip_recovery(struct ata_link *link)
3644 struct ata_port *ap = link->ap;
3645 struct ata_eh_context *ehc = &link->eh_context;
3646 struct ata_device *dev;
3648 /* skip disabled links */
3649 if (link->flags & ATA_LFLAG_DISABLED)
3652 /* skip if explicitly requested */
3653 if (ehc->i.flags & ATA_EHI_NO_RECOVERY)
3656 /* thaw frozen port and recover failed devices */
3657 if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link))
3660 /* reset at least once if reset is requested */
3661 if ((ehc->i.action & ATA_EH_RESET) &&
3662 !(ehc->i.flags & ATA_EHI_DID_RESET))
3665 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
3666 ata_for_each_dev(dev, link, ALL) {
3667 if (dev->class == ATA_DEV_UNKNOWN &&
3668 ehc->classes[dev->devno] != ATA_DEV_NONE)
3675 static int ata_count_probe_trials_cb(struct ata_ering_entry *ent, void *void_arg)
3677 u64 interval = msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL);
3678 u64 now = get_jiffies_64();
3679 int *trials = void_arg;
3681 if ((ent->eflags & ATA_EFLAG_OLD_ER) ||
3682 (ent->timestamp < now - min(now, interval)))
3689 static int ata_eh_schedule_probe(struct ata_device *dev)
3691 struct ata_eh_context *ehc = &dev->link->eh_context;
3692 struct ata_link *link = ata_dev_phys_link(dev);
3695 if (!(ehc->i.probe_mask & (1 << dev->devno)) ||
3696 (ehc->did_probe_mask & (1 << dev->devno)))
3699 ata_eh_detach_dev(dev);
3701 ehc->did_probe_mask |= (1 << dev->devno);
3702 ehc->i.action |= ATA_EH_RESET;
3703 ehc->saved_xfer_mode[dev->devno] = 0;
3704 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
3706 /* the link maybe in a deep sleep, wake it up */
3707 if (link->lpm_policy > ATA_LPM_MAX_POWER) {
3708 if (ata_is_host_link(link))
3709 link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER,
3712 sata_pmp_set_lpm(link, ATA_LPM_MAX_POWER,
3716 /* Record and count probe trials on the ering. The specific
3717 * error mask used is irrelevant. Because a successful device
3718 * detection clears the ering, this count accumulates only if
3719 * there are consecutive failed probes.
3721 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3722 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3723 * forced to 1.5Gbps.
3725 * This is to work around cases where failed link speed
3726 * negotiation results in device misdetection leading to
3727 * infinite DEVXCHG or PHRDY CHG events.
3729 ata_ering_record(&dev->ering, 0, AC_ERR_OTHER);
3730 ata_ering_map(&dev->ering, ata_count_probe_trials_cb, &trials);
3732 if (trials > ATA_EH_PROBE_TRIALS)
3733 sata_down_spd_limit(link, 1);
3738 static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
3740 struct ata_eh_context *ehc = &dev->link->eh_context;
3742 /* -EAGAIN from EH routine indicates retry without prejudice.
3743 * The requester is responsible for ensuring forward progress.
3746 ehc->tries[dev->devno]--;
3750 /* device missing or wrong IDENTIFY data, schedule probing */
3751 ehc->i.probe_mask |= (1 << dev->devno);
3753 /* give it just one more chance */
3754 ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
3756 if (ehc->tries[dev->devno] == 1) {
3757 /* This is the last chance, better to slow
3758 * down than lose it.
3760 sata_down_spd_limit(ata_dev_phys_link(dev), 0);
3761 if (dev->pio_mode > XFER_PIO_0)
3762 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
3766 if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
3767 /* disable device if it has used up all its chances */
3768 ata_dev_disable(dev);
3770 /* detach if offline */
3771 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
3772 ata_eh_detach_dev(dev);
3774 /* schedule probe if necessary */
3775 if (ata_eh_schedule_probe(dev)) {
3776 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
3777 memset(ehc->cmd_timeout_idx[dev->devno], 0,
3778 sizeof(ehc->cmd_timeout_idx[dev->devno]));
3783 ehc->i.action |= ATA_EH_RESET;
3789 * ata_eh_recover - recover host port after error
3790 * @ap: host port to recover
3791 * @prereset: prereset method (can be NULL)
3792 * @softreset: softreset method (can be NULL)
3793 * @hardreset: hardreset method (can be NULL)
3794 * @postreset: postreset method (can be NULL)
3795 * @r_failed_link: out parameter for failed link
3797 * This is the alpha and omega, eum and yang, heart and soul of
3798 * libata exception handling. On entry, actions required to
3799 * recover each link and hotplug requests are recorded in the
3800 * link's eh_context. This function executes all the operations
3801 * with appropriate retrials and fallbacks to resurrect failed
3802 * devices, detach goners and greet newcomers.
3805 * Kernel thread context (may sleep).
3808 * 0 on success, -errno on failure.
3810 int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
3811 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3812 ata_postreset_fn_t postreset,
3813 struct ata_link **r_failed_link)
3815 struct ata_link *link;
3816 struct ata_device *dev;
3818 unsigned long flags, deadline;
3822 /* prep for recovery */
3823 ata_for_each_link(link, ap, EDGE) {
3824 struct ata_eh_context *ehc = &link->eh_context;
3826 /* re-enable link? */
3827 if (ehc->i.action & ATA_EH_ENABLE_LINK) {
3828 ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK);
3829 spin_lock_irqsave(ap->lock, flags);
3830 link->flags &= ~ATA_LFLAG_DISABLED;
3831 spin_unlock_irqrestore(ap->lock, flags);
3832 ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK);
3835 ata_for_each_dev(dev, link, ALL) {
3836 if (link->flags & ATA_LFLAG_NO_RETRY)
3837 ehc->tries[dev->devno] = 1;
3839 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
3841 /* collect port action mask recorded in dev actions */
3842 ehc->i.action |= ehc->i.dev_action[dev->devno] &
3843 ~ATA_EH_PERDEV_MASK;
3844 ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK;
3846 /* process hotplug request */
3847 if (dev->flags & ATA_DFLAG_DETACH)
3848 ata_eh_detach_dev(dev);
3850 /* schedule probe if necessary */
3851 if (!ata_dev_enabled(dev))
3852 ata_eh_schedule_probe(dev);
3859 /* if UNLOADING, finish immediately */
3860 if (ap->pflags & ATA_PFLAG_UNLOADING)
3864 ata_for_each_link(link, ap, EDGE) {
3865 struct ata_eh_context *ehc = &link->eh_context;
3867 /* skip EH if possible. */
3868 if (ata_eh_skip_recovery(link))
3871 ata_for_each_dev(dev, link, ALL)
3872 ehc->classes[dev->devno] = ATA_DEV_UNKNOWN;
3876 ata_for_each_link(link, ap, EDGE) {
3877 struct ata_eh_context *ehc = &link->eh_context;
3879 if (!(ehc->i.action & ATA_EH_RESET))
3882 rc = ata_eh_reset(link, ata_link_nr_vacant(link),
3883 prereset, softreset, hardreset, postreset);
3885 ata_link_err(link, "reset failed, giving up\n");
3894 * clears ATA_EH_PARK in eh_info and resets
3895 * ap->park_req_pending
3897 ata_eh_pull_park_action(ap);
3900 ata_for_each_link(link, ap, EDGE) {
3901 ata_for_each_dev(dev, link, ALL) {
3902 struct ata_eh_context *ehc = &link->eh_context;
3905 if (dev->class != ATA_DEV_ATA &&
3906 dev->class != ATA_DEV_ZAC)
3908 if (!(ehc->i.dev_action[dev->devno] &
3911 tmp = dev->unpark_deadline;
3912 if (time_before(deadline, tmp))
3914 else if (time_before_eq(tmp, jiffies))
3916 if (ehc->unloaded_mask & (1 << dev->devno))
3919 ata_eh_park_issue_cmd(dev, 1);
3924 if (time_before_eq(deadline, now))
3928 deadline = wait_for_completion_timeout(&ap->park_req_pending,
3932 ata_for_each_link(link, ap, EDGE) {
3933 ata_for_each_dev(dev, link, ALL) {
3934 if (!(link->eh_context.unloaded_mask &
3938 ata_eh_park_issue_cmd(dev, 0);
3939 ata_eh_done(link, dev, ATA_EH_PARK);
3945 ata_for_each_link(link, ap, PMP_FIRST) {
3946 struct ata_eh_context *ehc = &link->eh_context;
3948 if (sata_pmp_attached(ap) && ata_is_host_link(link))
3951 /* revalidate existing devices and attach new ones */
3952 rc = ata_eh_revalidate_and_attach(link, &dev);
3956 /* if PMP got attached, return, pmp EH will take care of it */
3957 if (link->device->class == ATA_DEV_PMP) {
3962 /* configure transfer mode if necessary */
3963 if (ehc->i.flags & ATA_EHI_SETMODE) {
3964 rc = ata_set_mode(link, &dev);
3967 ehc->i.flags &= ~ATA_EHI_SETMODE;
3970 /* If reset has been issued, clear UA to avoid
3971 * disrupting the current users of the device.
3973 if (ehc->i.flags & ATA_EHI_DID_RESET) {
3974 ata_for_each_dev(dev, link, ALL) {
3975 if (dev->class != ATA_DEV_ATAPI)
3977 rc = atapi_eh_clear_ua(dev);
3980 if (zpodd_dev_enabled(dev))
3981 zpodd_post_poweron(dev);
3985 /* retry flush if necessary */
3986 ata_for_each_dev(dev, link, ALL) {
3987 if (dev->class != ATA_DEV_ATA &&
3988 dev->class != ATA_DEV_ZAC)
3990 rc = ata_eh_maybe_retry_flush(dev);
3996 /* configure link power saving */
3997 if (link->lpm_policy != ap->target_lpm_policy) {
3998 rc = ata_eh_set_lpm(link, ap->target_lpm_policy, &dev);
4003 /* this link is okay now */
4010 ata_eh_handle_dev_fail(dev, rc);
4012 if (ap->pflags & ATA_PFLAG_FROZEN) {
4013 /* PMP reset requires working host port.
4014 * Can't retry if it's frozen.
4016 if (sata_pmp_attached(ap))
4026 if (rc && r_failed_link)
4027 *r_failed_link = link;
4029 DPRINTK("EXIT, rc=%d\n", rc);
4034 * ata_eh_finish - finish up EH
4035 * @ap: host port to finish EH for
4037 * Recovery is complete. Clean up EH states and retry or finish
4043 void ata_eh_finish(struct ata_port *ap)
4047 /* retry or finish qcs */
4048 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
4049 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
4051 if (!(qc->flags & ATA_QCFLAG_FAILED))
4055 /* FIXME: Once EH migration is complete,
4056 * generate sense data in this function,
4057 * considering both err_mask and tf.
4059 if (qc->flags & ATA_QCFLAG_RETRY)
4060 ata_eh_qc_retry(qc);
4062 ata_eh_qc_complete(qc);
4064 if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
4065 ata_eh_qc_complete(qc);
4067 /* feed zero TF to sense generation */
4068 memset(&qc->result_tf, 0, sizeof(qc->result_tf));
4069 ata_eh_qc_retry(qc);
4074 /* make sure nr_active_links is zero after EH */
4075 WARN_ON(ap->nr_active_links);
4076 ap->nr_active_links = 0;
4080 * ata_do_eh - do standard error handling
4081 * @ap: host port to handle error for
4083 * @prereset: prereset method (can be NULL)
4084 * @softreset: softreset method (can be NULL)
4085 * @hardreset: hardreset method (can be NULL)
4086 * @postreset: postreset method (can be NULL)
4088 * Perform standard error handling sequence.
4091 * Kernel thread context (may sleep).
4093 void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
4094 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
4095 ata_postreset_fn_t postreset)
4097 struct ata_device *dev;
4103 rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset,
4106 ata_for_each_dev(dev, &ap->link, ALL)
4107 ata_dev_disable(dev);
4114 * ata_std_error_handler - standard error handler
4115 * @ap: host port to handle error for
4117 * Standard error handler
4120 * Kernel thread context (may sleep).
4122 void ata_std_error_handler(struct ata_port *ap)
4124 struct ata_port_operations *ops = ap->ops;
4125 ata_reset_fn_t hardreset = ops->hardreset;
4127 /* ignore built-in hardreset if SCR access is not available */
4128 if (hardreset == sata_std_hardreset && !sata_scr_valid(&ap->link))
4131 ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
4136 * ata_eh_handle_port_suspend - perform port suspend operation
4137 * @ap: port to suspend
4142 * Kernel thread context (may sleep).
4144 static void ata_eh_handle_port_suspend(struct ata_port *ap)
4146 unsigned long flags;
4148 struct ata_device *dev;
4150 /* are we suspending? */
4151 spin_lock_irqsave(ap->lock, flags);
4152 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
4153 ap->pm_mesg.event & PM_EVENT_RESUME) {
4154 spin_unlock_irqrestore(ap->lock, flags);
4157 spin_unlock_irqrestore(ap->lock, flags);
4159 WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
4162 * If we have a ZPODD attached, check its zero
4163 * power ready status before the port is frozen.
4164 * Only needed for runtime suspend.
4166 if (PMSG_IS_AUTO(ap->pm_mesg)) {
4167 ata_for_each_dev(dev, &ap->link, ENABLED) {
4168 if (zpodd_dev_enabled(dev))
4169 zpodd_on_suspend(dev);
4173 /* tell ACPI we're suspending */
4174 rc = ata_acpi_on_suspend(ap);
4179 ata_eh_freeze_port(ap);
4181 if (ap->ops->port_suspend)
4182 rc = ap->ops->port_suspend(ap, ap->pm_mesg);
4184 ata_acpi_set_state(ap, ap->pm_mesg);
4186 /* update the flags */
4187 spin_lock_irqsave(ap->lock, flags);
4189 ap->pflags &= ~ATA_PFLAG_PM_PENDING;
4191 ap->pflags |= ATA_PFLAG_SUSPENDED;
4192 else if (ap->pflags & ATA_PFLAG_FROZEN)
4193 ata_port_schedule_eh(ap);
4195 spin_unlock_irqrestore(ap->lock, flags);
4201 * ata_eh_handle_port_resume - perform port resume operation
4202 * @ap: port to resume
4207 * Kernel thread context (may sleep).
4209 static void ata_eh_handle_port_resume(struct ata_port *ap)
4211 struct ata_link *link;
4212 struct ata_device *dev;
4213 unsigned long flags;
4216 /* are we resuming? */
4217 spin_lock_irqsave(ap->lock, flags);
4218 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
4219 !(ap->pm_mesg.event & PM_EVENT_RESUME)) {
4220 spin_unlock_irqrestore(ap->lock, flags);
4223 spin_unlock_irqrestore(ap->lock, flags);
4225 WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
4228 * Error timestamps are in jiffies which doesn't run while
4229 * suspended and PHY events during resume isn't too uncommon.
4230 * When the two are combined, it can lead to unnecessary speed
4231 * downs if the machine is suspended and resumed repeatedly.
4232 * Clear error history.
4234 ata_for_each_link(link, ap, HOST_FIRST)
4235 ata_for_each_dev(dev, link, ALL)
4236 ata_ering_clear(&dev->ering);
4238 ata_acpi_set_state(ap, ap->pm_mesg);
4240 if (ap->ops->port_resume)
4241 rc = ap->ops->port_resume(ap);
4243 /* tell ACPI that we're resuming */
4244 ata_acpi_on_resume(ap);
4246 /* update the flags */
4247 spin_lock_irqsave(ap->lock, flags);
4248 ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
4249 spin_unlock_irqrestore(ap->lock, flags);
4251 #endif /* CONFIG_PM */