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_revalidate_timeouts[] = {
118 15000, /* Some drives are slow to read log pages when waking-up */
119 15000, /* combined time till here is enough even for media access */
123 static const unsigned long ata_eh_flush_timeouts[] = {
124 15000, /* be generous with flush */
126 30000, /* and even more generous */
130 static const unsigned long ata_eh_other_timeouts[] = {
131 5000, /* same rationale as identify timeout */
133 /* but no merciful 30sec for other commands, it just isn't worth it */
137 struct ata_eh_cmd_timeout_ent {
139 const unsigned long *timeouts;
142 /* The following table determines timeouts to use for EH internal
143 * commands. Each table entry is a command class and matches the
144 * commands the entry applies to and the timeout table to use.
146 * On the retry after a command timed out, the next timeout value from
147 * the table is used. If the table doesn't contain further entries,
148 * the last value is used.
150 * ehc->cmd_timeout_idx keeps track of which timeout to use per
151 * command class, so if SET_FEATURES times out on the first try, the
152 * next try will use the second timeout value only for that class.
154 #define CMDS(cmds...) (const u8 []){ cmds, 0 }
155 static const struct ata_eh_cmd_timeout_ent
156 ata_eh_cmd_timeout_table[ATA_EH_CMD_TIMEOUT_TABLE_SIZE] = {
157 { .commands = CMDS(ATA_CMD_ID_ATA, ATA_CMD_ID_ATAPI),
158 .timeouts = ata_eh_identify_timeouts, },
159 { .commands = CMDS(ATA_CMD_READ_LOG_EXT, ATA_CMD_READ_LOG_DMA_EXT),
160 .timeouts = ata_eh_revalidate_timeouts, },
161 { .commands = CMDS(ATA_CMD_READ_NATIVE_MAX, ATA_CMD_READ_NATIVE_MAX_EXT),
162 .timeouts = ata_eh_other_timeouts, },
163 { .commands = CMDS(ATA_CMD_SET_MAX, ATA_CMD_SET_MAX_EXT),
164 .timeouts = ata_eh_other_timeouts, },
165 { .commands = CMDS(ATA_CMD_SET_FEATURES),
166 .timeouts = ata_eh_other_timeouts, },
167 { .commands = CMDS(ATA_CMD_INIT_DEV_PARAMS),
168 .timeouts = ata_eh_other_timeouts, },
169 { .commands = CMDS(ATA_CMD_FLUSH, ATA_CMD_FLUSH_EXT),
170 .timeouts = ata_eh_flush_timeouts },
174 static void __ata_port_freeze(struct ata_port *ap);
176 static void ata_eh_handle_port_suspend(struct ata_port *ap);
177 static void ata_eh_handle_port_resume(struct ata_port *ap);
178 #else /* CONFIG_PM */
179 static void ata_eh_handle_port_suspend(struct ata_port *ap)
182 static void ata_eh_handle_port_resume(struct ata_port *ap)
184 #endif /* CONFIG_PM */
186 static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt,
189 ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len,
190 ATA_EH_DESC_LEN - ehi->desc_len,
195 * __ata_ehi_push_desc - push error description without adding separator
197 * @fmt: printf format string
199 * Format string according to @fmt and append it to @ehi->desc.
202 * spin_lock_irqsave(host lock)
204 void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
209 __ata_ehi_pushv_desc(ehi, fmt, args);
214 * ata_ehi_push_desc - push error description with separator
216 * @fmt: printf format string
218 * Format string according to @fmt and append it to @ehi->desc.
219 * If @ehi->desc is not empty, ", " is added in-between.
222 * spin_lock_irqsave(host lock)
224 void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
229 __ata_ehi_push_desc(ehi, ", ");
232 __ata_ehi_pushv_desc(ehi, fmt, args);
237 * ata_ehi_clear_desc - clean error description
243 * spin_lock_irqsave(host lock)
245 void ata_ehi_clear_desc(struct ata_eh_info *ehi)
252 * ata_port_desc - append port description
253 * @ap: target ATA port
254 * @fmt: printf format string
256 * Format string according to @fmt and append it to port
257 * description. If port description is not empty, " " is added
258 * in-between. This function is to be used while initializing
259 * ata_host. The description is printed on host registration.
264 void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
268 WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING));
270 if (ap->link.eh_info.desc_len)
271 __ata_ehi_push_desc(&ap->link.eh_info, " ");
274 __ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
281 * ata_port_pbar_desc - append PCI BAR description
282 * @ap: target ATA port
283 * @bar: target PCI BAR
284 * @offset: offset into PCI BAR
285 * @name: name of the area
287 * If @offset is negative, this function formats a string which
288 * contains the name, address, size and type of the BAR and
289 * appends it to the port description. If @offset is zero or
290 * positive, only name and offsetted address is appended.
295 void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
298 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
300 unsigned long long start, len;
302 if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
304 else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
307 start = (unsigned long long)pci_resource_start(pdev, bar);
308 len = (unsigned long long)pci_resource_len(pdev, bar);
311 ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start);
313 ata_port_desc(ap, "%s 0x%llx", name,
314 start + (unsigned long long)offset);
317 #endif /* CONFIG_PCI */
319 static int ata_lookup_timeout_table(u8 cmd)
323 for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
326 for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
335 * ata_internal_cmd_timeout - determine timeout for an internal command
336 * @dev: target device
337 * @cmd: internal command to be issued
339 * Determine timeout for internal command @cmd for @dev.
345 * Determined timeout.
347 unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd)
349 struct ata_eh_context *ehc = &dev->link->eh_context;
350 int ent = ata_lookup_timeout_table(cmd);
354 return ATA_EH_CMD_DFL_TIMEOUT;
356 idx = ehc->cmd_timeout_idx[dev->devno][ent];
357 return ata_eh_cmd_timeout_table[ent].timeouts[idx];
361 * ata_internal_cmd_timed_out - notification for internal command timeout
362 * @dev: target device
363 * @cmd: internal command which timed out
365 * Notify EH that internal command @cmd for @dev timed out. This
366 * function should be called only for commands whose timeouts are
367 * determined using ata_internal_cmd_timeout().
372 void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd)
374 struct ata_eh_context *ehc = &dev->link->eh_context;
375 int ent = ata_lookup_timeout_table(cmd);
381 idx = ehc->cmd_timeout_idx[dev->devno][ent];
382 if (ata_eh_cmd_timeout_table[ent].timeouts[idx + 1] != ULONG_MAX)
383 ehc->cmd_timeout_idx[dev->devno][ent]++;
386 static void ata_ering_record(struct ata_ering *ering, unsigned int eflags,
387 unsigned int err_mask)
389 struct ata_ering_entry *ent;
394 ering->cursor %= ATA_ERING_SIZE;
396 ent = &ering->ring[ering->cursor];
397 ent->eflags = eflags;
398 ent->err_mask = err_mask;
399 ent->timestamp = get_jiffies_64();
402 static struct ata_ering_entry *ata_ering_top(struct ata_ering *ering)
404 struct ata_ering_entry *ent = &ering->ring[ering->cursor];
411 int ata_ering_map(struct ata_ering *ering,
412 int (*map_fn)(struct ata_ering_entry *, void *),
416 struct ata_ering_entry *ent;
420 ent = &ering->ring[idx];
423 rc = map_fn(ent, arg);
426 idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
427 } while (idx != ering->cursor);
432 static int ata_ering_clear_cb(struct ata_ering_entry *ent, void *void_arg)
434 ent->eflags |= ATA_EFLAG_OLD_ER;
438 static void ata_ering_clear(struct ata_ering *ering)
440 ata_ering_map(ering, ata_ering_clear_cb, NULL);
443 static unsigned int ata_eh_dev_action(struct ata_device *dev)
445 struct ata_eh_context *ehc = &dev->link->eh_context;
447 return ehc->i.action | ehc->i.dev_action[dev->devno];
450 static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
451 struct ata_eh_info *ehi, unsigned int action)
453 struct ata_device *tdev;
456 ehi->action &= ~action;
457 ata_for_each_dev(tdev, link, ALL)
458 ehi->dev_action[tdev->devno] &= ~action;
460 /* doesn't make sense for port-wide EH actions */
461 WARN_ON(!(action & ATA_EH_PERDEV_MASK));
463 /* break ehi->action into ehi->dev_action */
464 if (ehi->action & action) {
465 ata_for_each_dev(tdev, link, ALL)
466 ehi->dev_action[tdev->devno] |=
467 ehi->action & action;
468 ehi->action &= ~action;
471 /* turn off the specified per-dev action */
472 ehi->dev_action[dev->devno] &= ~action;
477 * ata_eh_acquire - acquire EH ownership
478 * @ap: ATA port to acquire EH ownership for
480 * Acquire EH ownership for @ap. This is the basic exclusion
481 * mechanism for ports sharing a host. Only one port hanging off
482 * the same host can claim the ownership of EH.
487 void ata_eh_acquire(struct ata_port *ap)
489 mutex_lock(&ap->host->eh_mutex);
490 WARN_ON_ONCE(ap->host->eh_owner);
491 ap->host->eh_owner = current;
495 * ata_eh_release - release EH ownership
496 * @ap: ATA port to release EH ownership for
498 * Release EH ownership for @ap if the caller. The caller must
499 * have acquired EH ownership using ata_eh_acquire() previously.
504 void ata_eh_release(struct ata_port *ap)
506 WARN_ON_ONCE(ap->host->eh_owner != current);
507 ap->host->eh_owner = NULL;
508 mutex_unlock(&ap->host->eh_mutex);
512 * ata_scsi_timed_out - SCSI layer time out callback
513 * @cmd: timed out SCSI command
515 * Handles SCSI layer timeout. We race with normal completion of
516 * the qc for @cmd. If the qc is already gone, we lose and let
517 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
518 * timed out and EH should be invoked. Prevent ata_qc_complete()
519 * from finishing it by setting EH_SCHEDULED and return
522 * TODO: kill this function once old EH is gone.
525 * Called from timer context
528 * EH_HANDLED or EH_NOT_HANDLED
530 enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
532 struct Scsi_Host *host = cmd->device->host;
533 struct ata_port *ap = ata_shost_to_port(host);
535 struct ata_queued_cmd *qc;
536 enum blk_eh_timer_return ret;
540 if (ap->ops->error_handler) {
541 ret = BLK_EH_NOT_HANDLED;
545 ret = BLK_EH_HANDLED;
546 spin_lock_irqsave(ap->lock, flags);
547 qc = ata_qc_from_tag(ap, ap->link.active_tag);
549 WARN_ON(qc->scsicmd != cmd);
550 qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
551 qc->err_mask |= AC_ERR_TIMEOUT;
552 ret = BLK_EH_NOT_HANDLED;
554 spin_unlock_irqrestore(ap->lock, flags);
557 DPRINTK("EXIT, ret=%d\n", ret);
561 static void ata_eh_unload(struct ata_port *ap)
563 struct ata_link *link;
564 struct ata_device *dev;
567 /* Restore SControl IPM and SPD for the next driver and
568 * disable attached devices.
570 ata_for_each_link(link, ap, PMP_FIRST) {
571 sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
572 ata_for_each_dev(dev, link, ALL)
573 ata_dev_disable(dev);
576 /* freeze and set UNLOADED */
577 spin_lock_irqsave(ap->lock, flags);
579 ata_port_freeze(ap); /* won't be thawed */
580 ap->pflags &= ~ATA_PFLAG_EH_PENDING; /* clear pending from freeze */
581 ap->pflags |= ATA_PFLAG_UNLOADED;
583 spin_unlock_irqrestore(ap->lock, flags);
587 * ata_scsi_error - SCSI layer error handler callback
588 * @host: SCSI host on which error occurred
590 * Handles SCSI-layer-thrown error events.
593 * Inherited from SCSI layer (none, can sleep)
598 void ata_scsi_error(struct Scsi_Host *host)
600 struct ata_port *ap = ata_shost_to_port(host);
602 LIST_HEAD(eh_work_q);
606 spin_lock_irqsave(host->host_lock, flags);
607 list_splice_init(&host->eh_cmd_q, &eh_work_q);
608 spin_unlock_irqrestore(host->host_lock, flags);
610 ata_scsi_cmd_error_handler(host, ap, &eh_work_q);
612 /* If we timed raced normal completion and there is nothing to
613 recover nr_timedout == 0 why exactly are we doing error recovery ? */
614 ata_scsi_port_error_handler(host, ap);
616 /* finish or retry handled scmd's and clean up */
617 WARN_ON(!list_empty(&eh_work_q));
623 * ata_scsi_cmd_error_handler - error callback for a list of commands
624 * @host: scsi host containing the port
625 * @ap: ATA port within the host
626 * @eh_work_q: list of commands to process
628 * process the given list of commands and return those finished to the
629 * ap->eh_done_q. This function is the first part of the libata error
630 * handler which processes a given list of failed commands.
632 void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap,
633 struct list_head *eh_work_q)
638 /* make sure sff pio task is not running */
639 ata_sff_flush_pio_task(ap);
641 /* synchronize with host lock and sort out timeouts */
643 /* For new EH, all qcs are finished in one of three ways -
644 * normal completion, error completion, and SCSI timeout.
645 * Both completions can race against SCSI timeout. When normal
646 * completion wins, the qc never reaches EH. When error
647 * completion wins, the qc has ATA_QCFLAG_FAILED set.
649 * When SCSI timeout wins, things are a bit more complex.
650 * Normal or error completion can occur after the timeout but
651 * before this point. In such cases, both types of
652 * completions are honored. A scmd is determined to have
653 * timed out iff its associated qc is active and not failed.
655 if (ap->ops->error_handler) {
656 struct scsi_cmnd *scmd, *tmp;
659 spin_lock_irqsave(ap->lock, flags);
661 /* This must occur under the ap->lock as we don't want
662 a polled recovery to race the real interrupt handler
664 The lost_interrupt handler checks for any completed but
665 non-notified command and completes much like an IRQ handler.
667 We then fall into the error recovery code which will treat
668 this as if normal completion won the race */
670 if (ap->ops->lost_interrupt)
671 ap->ops->lost_interrupt(ap);
673 list_for_each_entry_safe(scmd, tmp, eh_work_q, eh_entry) {
674 struct ata_queued_cmd *qc;
676 for (i = 0; i < ATA_MAX_QUEUE; i++) {
677 qc = __ata_qc_from_tag(ap, i);
678 if (qc->flags & ATA_QCFLAG_ACTIVE &&
683 if (i < ATA_MAX_QUEUE) {
684 /* the scmd has an associated qc */
685 if (!(qc->flags & ATA_QCFLAG_FAILED)) {
686 /* which hasn't failed yet, timeout */
687 qc->err_mask |= AC_ERR_TIMEOUT;
688 qc->flags |= ATA_QCFLAG_FAILED;
692 /* Normal completion occurred after
693 * SCSI timeout but before this point.
694 * Successfully complete it.
696 scmd->retries = scmd->allowed;
697 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
701 /* If we have timed out qcs. They belong to EH from
702 * this point but the state of the controller is
703 * unknown. Freeze the port to make sure the IRQ
704 * handler doesn't diddle with those qcs. This must
705 * be done atomically w.r.t. setting QCFLAG_FAILED.
708 __ata_port_freeze(ap);
710 spin_unlock_irqrestore(ap->lock, flags);
712 /* initialize eh_tries */
713 ap->eh_tries = ATA_EH_MAX_TRIES;
715 spin_unlock_wait(ap->lock);
718 EXPORT_SYMBOL(ata_scsi_cmd_error_handler);
721 * ata_scsi_port_error_handler - recover the port after the commands
722 * @host: SCSI host containing the port
725 * Handle the recovery of the port @ap after all the commands
726 * have been recovered.
728 void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap)
732 /* invoke error handler */
733 if (ap->ops->error_handler) {
734 struct ata_link *link;
736 /* acquire EH ownership */
739 /* kill fast drain timer */
740 del_timer_sync(&ap->fastdrain_timer);
742 /* process port resume request */
743 ata_eh_handle_port_resume(ap);
745 /* fetch & clear EH info */
746 spin_lock_irqsave(ap->lock, flags);
748 ata_for_each_link(link, ap, HOST_FIRST) {
749 struct ata_eh_context *ehc = &link->eh_context;
750 struct ata_device *dev;
752 memset(&link->eh_context, 0, sizeof(link->eh_context));
753 link->eh_context.i = link->eh_info;
754 memset(&link->eh_info, 0, sizeof(link->eh_info));
756 ata_for_each_dev(dev, link, ENABLED) {
757 int devno = dev->devno;
759 ehc->saved_xfer_mode[devno] = dev->xfer_mode;
760 if (ata_ncq_enabled(dev))
761 ehc->saved_ncq_enabled |= 1 << devno;
765 ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
766 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
767 ap->excl_link = NULL; /* don't maintain exclusion over EH */
769 spin_unlock_irqrestore(ap->lock, flags);
771 /* invoke EH, skip if unloading or suspended */
772 if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
773 ap->ops->error_handler(ap);
775 /* if unloading, commence suicide */
776 if ((ap->pflags & ATA_PFLAG_UNLOADING) &&
777 !(ap->pflags & ATA_PFLAG_UNLOADED))
782 /* process port suspend request */
783 ata_eh_handle_port_suspend(ap);
785 /* Exception might have happened after ->error_handler
786 * recovered the port but before this point. Repeat
789 spin_lock_irqsave(ap->lock, flags);
791 if (ap->pflags & ATA_PFLAG_EH_PENDING) {
792 if (--ap->eh_tries) {
793 spin_unlock_irqrestore(ap->lock, flags);
797 "EH pending after %d tries, giving up\n",
799 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
802 /* this run is complete, make sure EH info is clear */
803 ata_for_each_link(link, ap, HOST_FIRST)
804 memset(&link->eh_info, 0, sizeof(link->eh_info));
806 /* end eh (clear host_eh_scheduled) while holding
807 * ap->lock such that if exception occurs after this
808 * point but before EH completion, SCSI midlayer will
813 spin_unlock_irqrestore(ap->lock, flags);
816 WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
817 ap->ops->eng_timeout(ap);
820 scsi_eh_flush_done_q(&ap->eh_done_q);
823 spin_lock_irqsave(ap->lock, flags);
825 if (ap->pflags & ATA_PFLAG_LOADING)
826 ap->pflags &= ~ATA_PFLAG_LOADING;
827 else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
828 schedule_delayed_work(&ap->hotplug_task, 0);
830 if (ap->pflags & ATA_PFLAG_RECOVERED)
831 ata_port_info(ap, "EH complete\n");
833 ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
835 /* tell wait_eh that we're done */
836 ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
837 wake_up_all(&ap->eh_wait_q);
839 spin_unlock_irqrestore(ap->lock, flags);
841 EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler);
844 * ata_port_wait_eh - Wait for the currently pending EH to complete
845 * @ap: Port to wait EH for
847 * Wait until the currently pending EH is complete.
850 * Kernel thread context (may sleep).
852 void ata_port_wait_eh(struct ata_port *ap)
858 spin_lock_irqsave(ap->lock, flags);
860 while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
861 prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
862 spin_unlock_irqrestore(ap->lock, flags);
864 spin_lock_irqsave(ap->lock, flags);
866 finish_wait(&ap->eh_wait_q, &wait);
868 spin_unlock_irqrestore(ap->lock, flags);
870 /* make sure SCSI EH is complete */
871 if (scsi_host_in_recovery(ap->scsi_host)) {
876 EXPORT_SYMBOL_GPL(ata_port_wait_eh);
878 static int ata_eh_nr_in_flight(struct ata_port *ap)
883 /* count only non-internal commands */
884 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++)
885 if (ata_qc_from_tag(ap, tag))
891 void ata_eh_fastdrain_timerfn(unsigned long arg)
893 struct ata_port *ap = (void *)arg;
897 spin_lock_irqsave(ap->lock, flags);
899 cnt = ata_eh_nr_in_flight(ap);
905 if (cnt == ap->fastdrain_cnt) {
908 /* No progress during the last interval, tag all
909 * in-flight qcs as timed out and freeze the port.
911 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) {
912 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
914 qc->err_mask |= AC_ERR_TIMEOUT;
919 /* some qcs have finished, give it another chance */
920 ap->fastdrain_cnt = cnt;
921 ap->fastdrain_timer.expires =
922 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
923 add_timer(&ap->fastdrain_timer);
927 spin_unlock_irqrestore(ap->lock, flags);
931 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
932 * @ap: target ATA port
933 * @fastdrain: activate fast drain
935 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
936 * is non-zero and EH wasn't pending before. Fast drain ensures
937 * that EH kicks in in timely manner.
940 * spin_lock_irqsave(host lock)
942 static void ata_eh_set_pending(struct ata_port *ap, int fastdrain)
946 /* already scheduled? */
947 if (ap->pflags & ATA_PFLAG_EH_PENDING)
950 ap->pflags |= ATA_PFLAG_EH_PENDING;
955 /* do we have in-flight qcs? */
956 cnt = ata_eh_nr_in_flight(ap);
960 /* activate fast drain */
961 ap->fastdrain_cnt = cnt;
962 ap->fastdrain_timer.expires =
963 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
964 add_timer(&ap->fastdrain_timer);
968 * ata_qc_schedule_eh - schedule qc for error handling
969 * @qc: command to schedule error handling for
971 * Schedule error handling for @qc. EH will kick in as soon as
972 * other commands are drained.
975 * spin_lock_irqsave(host lock)
977 void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
979 struct ata_port *ap = qc->ap;
980 struct request_queue *q = qc->scsicmd->device->request_queue;
983 WARN_ON(!ap->ops->error_handler);
985 qc->flags |= ATA_QCFLAG_FAILED;
986 ata_eh_set_pending(ap, 1);
988 /* The following will fail if timeout has already expired.
989 * ata_scsi_error() takes care of such scmds on EH entry.
990 * Note that ATA_QCFLAG_FAILED is unconditionally set after
991 * this function completes.
993 spin_lock_irqsave(q->queue_lock, flags);
994 blk_abort_request(qc->scsicmd->request);
995 spin_unlock_irqrestore(q->queue_lock, flags);
999 * ata_std_sched_eh - non-libsas ata_ports issue eh with this common routine
1000 * @ap: ATA port to schedule EH for
1002 * LOCKING: inherited from ata_port_schedule_eh
1003 * spin_lock_irqsave(host lock)
1005 void ata_std_sched_eh(struct ata_port *ap)
1007 WARN_ON(!ap->ops->error_handler);
1009 if (ap->pflags & ATA_PFLAG_INITIALIZING)
1012 ata_eh_set_pending(ap, 1);
1013 scsi_schedule_eh(ap->scsi_host);
1015 DPRINTK("port EH scheduled\n");
1017 EXPORT_SYMBOL_GPL(ata_std_sched_eh);
1020 * ata_std_end_eh - non-libsas ata_ports complete eh with this common routine
1021 * @ap: ATA port to end EH for
1023 * In the libata object model there is a 1:1 mapping of ata_port to
1024 * shost, so host fields can be directly manipulated under ap->lock, in
1025 * the libsas case we need to hold a lock at the ha->level to coordinate
1029 * spin_lock_irqsave(host lock)
1031 void ata_std_end_eh(struct ata_port *ap)
1033 struct Scsi_Host *host = ap->scsi_host;
1035 host->host_eh_scheduled = 0;
1037 EXPORT_SYMBOL(ata_std_end_eh);
1041 * ata_port_schedule_eh - schedule error handling without a qc
1042 * @ap: ATA port to schedule EH for
1044 * Schedule error handling for @ap. EH will kick in as soon as
1045 * all commands are drained.
1048 * spin_lock_irqsave(host lock)
1050 void ata_port_schedule_eh(struct ata_port *ap)
1052 /* see: ata_std_sched_eh, unless you know better */
1053 ap->ops->sched_eh(ap);
1056 static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
1058 int tag, nr_aborted = 0;
1060 WARN_ON(!ap->ops->error_handler);
1062 /* we're gonna abort all commands, no need for fast drain */
1063 ata_eh_set_pending(ap, 0);
1065 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1066 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
1068 if (qc && (!link || qc->dev->link == link)) {
1069 qc->flags |= ATA_QCFLAG_FAILED;
1070 ata_qc_complete(qc);
1076 ata_port_schedule_eh(ap);
1082 * ata_link_abort - abort all qc's on the link
1083 * @link: ATA link to abort qc's for
1085 * Abort all active qc's active on @link and schedule EH.
1088 * spin_lock_irqsave(host lock)
1091 * Number of aborted qc's.
1093 int ata_link_abort(struct ata_link *link)
1095 return ata_do_link_abort(link->ap, link);
1099 * ata_port_abort - abort all qc's on the port
1100 * @ap: ATA port to abort qc's for
1102 * Abort all active qc's of @ap and schedule EH.
1105 * spin_lock_irqsave(host_set lock)
1108 * Number of aborted qc's.
1110 int ata_port_abort(struct ata_port *ap)
1112 return ata_do_link_abort(ap, NULL);
1116 * __ata_port_freeze - freeze port
1117 * @ap: ATA port to freeze
1119 * This function is called when HSM violation or some other
1120 * condition disrupts normal operation of the port. Frozen port
1121 * is not allowed to perform any operation until the port is
1122 * thawed, which usually follows a successful reset.
1124 * ap->ops->freeze() callback can be used for freezing the port
1125 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1126 * port cannot be frozen hardware-wise, the interrupt handler
1127 * must ack and clear interrupts unconditionally while the port
1131 * spin_lock_irqsave(host lock)
1133 static void __ata_port_freeze(struct ata_port *ap)
1135 WARN_ON(!ap->ops->error_handler);
1137 if (ap->ops->freeze)
1138 ap->ops->freeze(ap);
1140 ap->pflags |= ATA_PFLAG_FROZEN;
1142 DPRINTK("ata%u port frozen\n", ap->print_id);
1146 * ata_port_freeze - abort & freeze port
1147 * @ap: ATA port to freeze
1149 * Abort and freeze @ap. The freeze operation must be called
1150 * first, because some hardware requires special operations
1151 * before the taskfile registers are accessible.
1154 * spin_lock_irqsave(host lock)
1157 * Number of aborted commands.
1159 int ata_port_freeze(struct ata_port *ap)
1163 WARN_ON(!ap->ops->error_handler);
1165 __ata_port_freeze(ap);
1166 nr_aborted = ata_port_abort(ap);
1172 * sata_async_notification - SATA async notification handler
1173 * @ap: ATA port where async notification is received
1175 * Handler to be called when async notification via SDB FIS is
1176 * received. This function schedules EH if necessary.
1179 * spin_lock_irqsave(host lock)
1182 * 1 if EH is scheduled, 0 otherwise.
1184 int sata_async_notification(struct ata_port *ap)
1189 if (!(ap->flags & ATA_FLAG_AN))
1192 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1194 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1196 if (!sata_pmp_attached(ap) || rc) {
1197 /* PMP is not attached or SNTF is not available */
1198 if (!sata_pmp_attached(ap)) {
1199 /* PMP is not attached. Check whether ATAPI
1200 * AN is configured. If so, notify media
1203 struct ata_device *dev = ap->link.device;
1205 if ((dev->class == ATA_DEV_ATAPI) &&
1206 (dev->flags & ATA_DFLAG_AN))
1207 ata_scsi_media_change_notify(dev);
1210 /* PMP is attached but SNTF is not available.
1211 * ATAPI async media change notification is
1212 * not used. The PMP must be reporting PHY
1213 * status change, schedule EH.
1215 ata_port_schedule_eh(ap);
1219 /* PMP is attached and SNTF is available */
1220 struct ata_link *link;
1222 /* check and notify ATAPI AN */
1223 ata_for_each_link(link, ap, EDGE) {
1224 if (!(sntf & (1 << link->pmp)))
1227 if ((link->device->class == ATA_DEV_ATAPI) &&
1228 (link->device->flags & ATA_DFLAG_AN))
1229 ata_scsi_media_change_notify(link->device);
1232 /* If PMP is reporting that PHY status of some
1233 * downstream ports has changed, schedule EH.
1235 if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
1236 ata_port_schedule_eh(ap);
1245 * ata_eh_freeze_port - EH helper to freeze port
1246 * @ap: ATA port to freeze
1253 void ata_eh_freeze_port(struct ata_port *ap)
1255 unsigned long flags;
1257 if (!ap->ops->error_handler)
1260 spin_lock_irqsave(ap->lock, flags);
1261 __ata_port_freeze(ap);
1262 spin_unlock_irqrestore(ap->lock, flags);
1266 * ata_port_thaw_port - EH helper to thaw port
1267 * @ap: ATA port to thaw
1269 * Thaw frozen port @ap.
1274 void ata_eh_thaw_port(struct ata_port *ap)
1276 unsigned long flags;
1278 if (!ap->ops->error_handler)
1281 spin_lock_irqsave(ap->lock, flags);
1283 ap->pflags &= ~ATA_PFLAG_FROZEN;
1288 spin_unlock_irqrestore(ap->lock, flags);
1290 DPRINTK("ata%u port thawed\n", ap->print_id);
1293 static void ata_eh_scsidone(struct scsi_cmnd *scmd)
1298 static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
1300 struct ata_port *ap = qc->ap;
1301 struct scsi_cmnd *scmd = qc->scsicmd;
1302 unsigned long flags;
1304 spin_lock_irqsave(ap->lock, flags);
1305 qc->scsidone = ata_eh_scsidone;
1306 __ata_qc_complete(qc);
1307 WARN_ON(ata_tag_valid(qc->tag));
1308 spin_unlock_irqrestore(ap->lock, flags);
1310 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
1314 * ata_eh_qc_complete - Complete an active ATA command from EH
1315 * @qc: Command to complete
1317 * Indicate to the mid and upper layers that an ATA command has
1318 * completed. To be used from EH.
1320 void ata_eh_qc_complete(struct ata_queued_cmd *qc)
1322 struct scsi_cmnd *scmd = qc->scsicmd;
1323 scmd->retries = scmd->allowed;
1324 __ata_eh_qc_complete(qc);
1328 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1329 * @qc: Command to retry
1331 * Indicate to the mid and upper layers that an ATA command
1332 * should be retried. To be used from EH.
1334 * SCSI midlayer limits the number of retries to scmd->allowed.
1335 * scmd->allowed is incremented for commands which get retried
1336 * due to unrelated failures (qc->err_mask is zero).
1338 void ata_eh_qc_retry(struct ata_queued_cmd *qc)
1340 struct scsi_cmnd *scmd = qc->scsicmd;
1343 __ata_eh_qc_complete(qc);
1347 * ata_dev_disable - disable ATA device
1348 * @dev: ATA device to disable
1355 void ata_dev_disable(struct ata_device *dev)
1357 if (!ata_dev_enabled(dev))
1360 if (ata_msg_drv(dev->link->ap))
1361 ata_dev_warn(dev, "disabled\n");
1362 ata_acpi_on_disable(dev);
1363 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
1366 /* From now till the next successful probe, ering is used to
1367 * track probe failures. Clear accumulated device error info.
1369 ata_ering_clear(&dev->ering);
1373 * ata_eh_detach_dev - detach ATA device
1374 * @dev: ATA device to detach
1381 void ata_eh_detach_dev(struct ata_device *dev)
1383 struct ata_link *link = dev->link;
1384 struct ata_port *ap = link->ap;
1385 struct ata_eh_context *ehc = &link->eh_context;
1386 unsigned long flags;
1388 ata_dev_disable(dev);
1390 spin_lock_irqsave(ap->lock, flags);
1392 dev->flags &= ~ATA_DFLAG_DETACH;
1394 if (ata_scsi_offline_dev(dev)) {
1395 dev->flags |= ATA_DFLAG_DETACHED;
1396 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
1399 /* clear per-dev EH info */
1400 ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK);
1401 ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK);
1402 ehc->saved_xfer_mode[dev->devno] = 0;
1403 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
1405 spin_unlock_irqrestore(ap->lock, flags);
1409 * ata_eh_about_to_do - about to perform eh_action
1410 * @link: target ATA link
1411 * @dev: target ATA dev for per-dev action (can be NULL)
1412 * @action: action about to be performed
1414 * Called just before performing EH actions to clear related bits
1415 * in @link->eh_info such that eh actions are not unnecessarily
1421 void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
1422 unsigned int action)
1424 struct ata_port *ap = link->ap;
1425 struct ata_eh_info *ehi = &link->eh_info;
1426 struct ata_eh_context *ehc = &link->eh_context;
1427 unsigned long flags;
1429 spin_lock_irqsave(ap->lock, flags);
1431 ata_eh_clear_action(link, dev, ehi, action);
1433 /* About to take EH action, set RECOVERED. Ignore actions on
1434 * slave links as master will do them again.
1436 if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link)
1437 ap->pflags |= ATA_PFLAG_RECOVERED;
1439 spin_unlock_irqrestore(ap->lock, flags);
1443 * ata_eh_done - EH action complete
1444 * @ap: target ATA port
1445 * @dev: target ATA dev for per-dev action (can be NULL)
1446 * @action: action just completed
1448 * Called right after performing EH actions to clear related bits
1449 * in @link->eh_context.
1454 void ata_eh_done(struct ata_link *link, struct ata_device *dev,
1455 unsigned int action)
1457 struct ata_eh_context *ehc = &link->eh_context;
1459 ata_eh_clear_action(link, dev, &ehc->i, action);
1463 * ata_err_string - convert err_mask to descriptive string
1464 * @err_mask: error mask to convert to string
1466 * Convert @err_mask to descriptive string. Errors are
1467 * prioritized according to severity and only the most severe
1468 * error is reported.
1474 * Descriptive string for @err_mask
1476 static const char *ata_err_string(unsigned int err_mask)
1478 if (err_mask & AC_ERR_HOST_BUS)
1479 return "host bus error";
1480 if (err_mask & AC_ERR_ATA_BUS)
1481 return "ATA bus error";
1482 if (err_mask & AC_ERR_TIMEOUT)
1484 if (err_mask & AC_ERR_HSM)
1485 return "HSM violation";
1486 if (err_mask & AC_ERR_SYSTEM)
1487 return "internal error";
1488 if (err_mask & AC_ERR_MEDIA)
1489 return "media error";
1490 if (err_mask & AC_ERR_INVALID)
1491 return "invalid argument";
1492 if (err_mask & AC_ERR_DEV)
1493 return "device error";
1494 return "unknown error";
1498 * ata_read_log_page - read a specific log page
1499 * @dev: target device
1501 * @page: page to read
1502 * @buf: buffer to store read page
1503 * @sectors: number of sectors to read
1505 * Read log page using READ_LOG_EXT command.
1508 * Kernel thread context (may sleep).
1511 * 0 on success, AC_ERR_* mask otherwise.
1513 unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
1514 u8 page, void *buf, unsigned int sectors)
1516 unsigned long ap_flags = dev->link->ap->flags;
1517 struct ata_taskfile tf;
1518 unsigned int err_mask;
1521 DPRINTK("read log page - log 0x%x, page 0x%x\n", log, page);
1524 * Return error without actually issuing the command on controllers
1525 * which e.g. lockup on a read log page.
1527 if (ap_flags & ATA_FLAG_NO_LOG_PAGE)
1531 ata_tf_init(dev, &tf);
1532 if (dev->dma_mode && ata_id_has_read_log_dma_ext(dev->id) &&
1533 !(dev->horkage & ATA_HORKAGE_NO_NCQ_LOG)) {
1534 tf.command = ATA_CMD_READ_LOG_DMA_EXT;
1535 tf.protocol = ATA_PROT_DMA;
1538 tf.command = ATA_CMD_READ_LOG_EXT;
1539 tf.protocol = ATA_PROT_PIO;
1545 tf.hob_nsect = sectors >> 8;
1546 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
1548 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1549 buf, sectors * ATA_SECT_SIZE, 0);
1551 if (err_mask && dma) {
1552 dev->horkage |= ATA_HORKAGE_NO_NCQ_LOG;
1553 ata_dev_warn(dev, "READ LOG DMA EXT failed, trying unqueued\n");
1557 DPRINTK("EXIT, err_mask=%x\n", err_mask);
1562 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1563 * @dev: Device to read log page 10h from
1564 * @tag: Resulting tag of the failed command
1565 * @tf: Resulting taskfile registers of the failed command
1567 * Read log page 10h to obtain NCQ error details and clear error
1571 * Kernel thread context (may sleep).
1574 * 0 on success, -errno otherwise.
1576 static int ata_eh_read_log_10h(struct ata_device *dev,
1577 int *tag, struct ata_taskfile *tf)
1579 u8 *buf = dev->link->ap->sector_buf;
1580 unsigned int err_mask;
1584 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1);
1589 for (i = 0; i < ATA_SECT_SIZE; i++)
1592 ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n",
1598 *tag = buf[0] & 0x1f;
1600 tf->command = buf[2];
1601 tf->feature = buf[3];
1605 tf->device = buf[7];
1606 tf->hob_lbal = buf[8];
1607 tf->hob_lbam = buf[9];
1608 tf->hob_lbah = buf[10];
1609 tf->nsect = buf[12];
1610 tf->hob_nsect = buf[13];
1616 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1617 * @dev: target ATAPI device
1618 * @r_sense_key: out parameter for sense_key
1620 * Perform ATAPI TEST_UNIT_READY.
1623 * EH context (may sleep).
1626 * 0 on success, AC_ERR_* mask on failure.
1628 unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key)
1630 u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 };
1631 struct ata_taskfile tf;
1632 unsigned int err_mask;
1634 ata_tf_init(dev, &tf);
1636 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1637 tf.command = ATA_CMD_PACKET;
1638 tf.protocol = ATAPI_PROT_NODATA;
1640 err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
1641 if (err_mask == AC_ERR_DEV)
1642 *r_sense_key = tf.feature >> 4;
1647 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1648 * @dev: device to perform REQUEST_SENSE to
1649 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1650 * @dfl_sense_key: default sense key to use
1652 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1653 * SENSE. This function is EH helper.
1656 * Kernel thread context (may sleep).
1659 * 0 on success, AC_ERR_* mask on failure
1661 unsigned int atapi_eh_request_sense(struct ata_device *dev,
1662 u8 *sense_buf, u8 dfl_sense_key)
1664 u8 cdb[ATAPI_CDB_LEN] =
1665 { REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 };
1666 struct ata_port *ap = dev->link->ap;
1667 struct ata_taskfile tf;
1669 DPRINTK("ATAPI request sense\n");
1671 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
1673 /* initialize sense_buf with the error register,
1674 * for the case where they are -not- overwritten
1676 sense_buf[0] = 0x70;
1677 sense_buf[2] = dfl_sense_key;
1679 /* some devices time out if garbage left in tf */
1680 ata_tf_init(dev, &tf);
1682 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1683 tf.command = ATA_CMD_PACKET;
1685 /* is it pointless to prefer PIO for "safety reasons"? */
1686 if (ap->flags & ATA_FLAG_PIO_DMA) {
1687 tf.protocol = ATAPI_PROT_DMA;
1688 tf.feature |= ATAPI_PKT_DMA;
1690 tf.protocol = ATAPI_PROT_PIO;
1691 tf.lbam = SCSI_SENSE_BUFFERSIZE;
1695 return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
1696 sense_buf, SCSI_SENSE_BUFFERSIZE, 0);
1700 * ata_eh_analyze_serror - analyze SError for a failed port
1701 * @link: ATA link to analyze SError for
1703 * Analyze SError if available and further determine cause of
1709 static void ata_eh_analyze_serror(struct ata_link *link)
1711 struct ata_eh_context *ehc = &link->eh_context;
1712 u32 serror = ehc->i.serror;
1713 unsigned int err_mask = 0, action = 0;
1716 if (serror & (SERR_PERSISTENT | SERR_DATA)) {
1717 err_mask |= AC_ERR_ATA_BUS;
1718 action |= ATA_EH_RESET;
1720 if (serror & SERR_PROTOCOL) {
1721 err_mask |= AC_ERR_HSM;
1722 action |= ATA_EH_RESET;
1724 if (serror & SERR_INTERNAL) {
1725 err_mask |= AC_ERR_SYSTEM;
1726 action |= ATA_EH_RESET;
1729 /* Determine whether a hotplug event has occurred. Both
1730 * SError.N/X are considered hotplug events for enabled or
1731 * host links. For disabled PMP links, only N bit is
1732 * considered as X bit is left at 1 for link plugging.
1734 if (link->lpm_policy > ATA_LPM_MAX_POWER)
1735 hotplug_mask = 0; /* hotplug doesn't work w/ LPM */
1736 else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
1737 hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;
1739 hotplug_mask = SERR_PHYRDY_CHG;
1741 if (serror & hotplug_mask)
1742 ata_ehi_hotplugged(&ehc->i);
1744 ehc->i.err_mask |= err_mask;
1745 ehc->i.action |= action;
1749 * ata_eh_analyze_ncq_error - analyze NCQ error
1750 * @link: ATA link to analyze NCQ error for
1752 * Read log page 10h, determine the offending qc and acquire
1753 * error status TF. For NCQ device errors, all LLDDs have to do
1754 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1758 * Kernel thread context (may sleep).
1760 void ata_eh_analyze_ncq_error(struct ata_link *link)
1762 struct ata_port *ap = link->ap;
1763 struct ata_eh_context *ehc = &link->eh_context;
1764 struct ata_device *dev = link->device;
1765 struct ata_queued_cmd *qc;
1766 struct ata_taskfile tf;
1769 /* if frozen, we can't do much */
1770 if (ap->pflags & ATA_PFLAG_FROZEN)
1773 /* is it NCQ device error? */
1774 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
1777 /* has LLDD analyzed already? */
1778 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1779 qc = __ata_qc_from_tag(ap, tag);
1781 if (!(qc->flags & ATA_QCFLAG_FAILED))
1788 /* okay, this error is ours */
1789 memset(&tf, 0, sizeof(tf));
1790 rc = ata_eh_read_log_10h(dev, &tag, &tf);
1792 ata_link_err(link, "failed to read log page 10h (errno=%d)\n",
1797 if (!(link->sactive & (1 << tag))) {
1798 ata_link_err(link, "log page 10h reported inactive tag %d\n",
1803 /* we've got the perpetrator, condemn it */
1804 qc = __ata_qc_from_tag(ap, tag);
1805 memcpy(&qc->result_tf, &tf, sizeof(tf));
1806 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1807 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
1808 ehc->i.err_mask &= ~AC_ERR_DEV;
1812 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1813 * @qc: qc to analyze
1814 * @tf: Taskfile registers to analyze
1816 * Analyze taskfile of @qc and further determine cause of
1817 * failure. This function also requests ATAPI sense data if
1821 * Kernel thread context (may sleep).
1824 * Determined recovery action
1826 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
1827 const struct ata_taskfile *tf)
1829 unsigned int tmp, action = 0;
1830 u8 stat = tf->command, err = tf->feature;
1832 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
1833 qc->err_mask |= AC_ERR_HSM;
1834 return ATA_EH_RESET;
1837 if (stat & (ATA_ERR | ATA_DF))
1838 qc->err_mask |= AC_ERR_DEV;
1842 switch (qc->dev->class) {
1846 qc->err_mask |= AC_ERR_ATA_BUS;
1847 if (err & (ATA_UNC | ATA_AMNF))
1848 qc->err_mask |= AC_ERR_MEDIA;
1850 qc->err_mask |= AC_ERR_INVALID;
1854 if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
1855 tmp = atapi_eh_request_sense(qc->dev,
1856 qc->scsicmd->sense_buffer,
1857 qc->result_tf.feature >> 4);
1859 /* ATA_QCFLAG_SENSE_VALID is used to
1860 * tell atapi_qc_complete() that sense
1861 * data is already valid.
1863 * TODO: interpret sense data and set
1864 * appropriate err_mask.
1866 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1868 qc->err_mask |= tmp;
1872 if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
1873 action |= ATA_EH_RESET;
1878 static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask,
1883 if (!(eflags & ATA_EFLAG_DUBIOUS_XFER))
1887 base = ATA_ECAT_DUBIOUS_NONE;
1889 if (err_mask & AC_ERR_ATA_BUS)
1890 return base + ATA_ECAT_ATA_BUS;
1892 if (err_mask & AC_ERR_TIMEOUT)
1893 return base + ATA_ECAT_TOUT_HSM;
1895 if (eflags & ATA_EFLAG_IS_IO) {
1896 if (err_mask & AC_ERR_HSM)
1897 return base + ATA_ECAT_TOUT_HSM;
1899 (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
1900 return base + ATA_ECAT_UNK_DEV;
1906 struct speed_down_verdict_arg {
1909 int nr_errors[ATA_ECAT_NR];
1912 static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
1914 struct speed_down_verdict_arg *arg = void_arg;
1917 if ((ent->eflags & ATA_EFLAG_OLD_ER) || (ent->timestamp < arg->since))
1920 cat = ata_eh_categorize_error(ent->eflags, ent->err_mask,
1922 arg->nr_errors[cat]++;
1928 * ata_eh_speed_down_verdict - Determine speed down verdict
1929 * @dev: Device of interest
1931 * This function examines error ring of @dev and determines
1932 * whether NCQ needs to be turned off, transfer speed should be
1933 * stepped down, or falling back to PIO is necessary.
1935 * ECAT_ATA_BUS : ATA_BUS error for any command
1937 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1940 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1942 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1943 * data transfer hasn't been verified.
1947 * NCQ_OFF : Turn off NCQ.
1949 * SPEED_DOWN : Speed down transfer speed but don't fall back
1952 * FALLBACK_TO_PIO : Fall back to PIO.
1954 * Even if multiple verdicts are returned, only one action is
1955 * taken per error. An action triggered by non-DUBIOUS errors
1956 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1957 * This is to expedite speed down decisions right after device is
1958 * initially configured.
1960 * The followings are speed down rules. #1 and #2 deal with
1963 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1964 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1966 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1967 * occurred during last 5 mins, NCQ_OFF.
1969 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1970 * occurred during last 5 mins, FALLBACK_TO_PIO
1972 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1973 * during last 10 mins, NCQ_OFF.
1975 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1976 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1979 * Inherited from caller.
1982 * OR of ATA_EH_SPDN_* flags.
1984 static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev)
1986 const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ;
1987 u64 j64 = get_jiffies_64();
1988 struct speed_down_verdict_arg arg;
1989 unsigned int verdict = 0;
1991 /* scan past 5 mins of error history */
1992 memset(&arg, 0, sizeof(arg));
1993 arg.since = j64 - min(j64, j5mins);
1994 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
1996 if (arg.nr_errors[ATA_ECAT_DUBIOUS_ATA_BUS] +
1997 arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1)
1998 verdict |= ATA_EH_SPDN_SPEED_DOWN |
1999 ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS;
2001 if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] +
2002 arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1)
2003 verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS;
2005 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
2006 arg.nr_errors[ATA_ECAT_TOUT_HSM] +
2007 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
2008 verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
2010 /* scan past 10 mins of error history */
2011 memset(&arg, 0, sizeof(arg));
2012 arg.since = j64 - min(j64, j10mins);
2013 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
2015 if (arg.nr_errors[ATA_ECAT_TOUT_HSM] +
2016 arg.nr_errors[ATA_ECAT_UNK_DEV] > 3)
2017 verdict |= ATA_EH_SPDN_NCQ_OFF;
2019 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
2020 arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 ||
2021 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
2022 verdict |= ATA_EH_SPDN_SPEED_DOWN;
2028 * ata_eh_speed_down - record error and speed down if necessary
2029 * @dev: Failed device
2030 * @eflags: mask of ATA_EFLAG_* flags
2031 * @err_mask: err_mask of the error
2033 * Record error and examine error history to determine whether
2034 * adjusting transmission speed is necessary. It also sets
2035 * transmission limits appropriately if such adjustment is
2039 * Kernel thread context (may sleep).
2042 * Determined recovery action.
2044 static unsigned int ata_eh_speed_down(struct ata_device *dev,
2045 unsigned int eflags, unsigned int err_mask)
2047 struct ata_link *link = ata_dev_phys_link(dev);
2049 unsigned int verdict;
2050 unsigned int action = 0;
2052 /* don't bother if Cat-0 error */
2053 if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0)
2056 /* record error and determine whether speed down is necessary */
2057 ata_ering_record(&dev->ering, eflags, err_mask);
2058 verdict = ata_eh_speed_down_verdict(dev);
2061 if ((verdict & ATA_EH_SPDN_NCQ_OFF) &&
2062 (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ |
2063 ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) {
2064 dev->flags |= ATA_DFLAG_NCQ_OFF;
2065 ata_dev_warn(dev, "NCQ disabled due to excessive errors\n");
2070 if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
2071 /* speed down SATA link speed if possible */
2072 if (sata_down_spd_limit(link, 0) == 0) {
2073 action |= ATA_EH_RESET;
2077 /* lower transfer mode */
2078 if (dev->spdn_cnt < 2) {
2079 static const int dma_dnxfer_sel[] =
2080 { ATA_DNXFER_DMA, ATA_DNXFER_40C };
2081 static const int pio_dnxfer_sel[] =
2082 { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 };
2085 if (dev->xfer_shift != ATA_SHIFT_PIO)
2086 sel = dma_dnxfer_sel[dev->spdn_cnt];
2088 sel = pio_dnxfer_sel[dev->spdn_cnt];
2092 if (ata_down_xfermask_limit(dev, sel) == 0) {
2093 action |= ATA_EH_RESET;
2099 /* Fall back to PIO? Slowing down to PIO is meaningless for
2100 * SATA ATA devices. Consider it only for PATA and SATAPI.
2102 if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
2103 (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) &&
2104 (dev->xfer_shift != ATA_SHIFT_PIO)) {
2105 if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
2107 action |= ATA_EH_RESET;
2114 /* device has been slowed down, blow error history */
2115 if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS))
2116 ata_ering_clear(&dev->ering);
2121 * ata_eh_worth_retry - analyze error and decide whether to retry
2122 * @qc: qc to possibly retry
2124 * Look at the cause of the error and decide if a retry
2125 * might be useful or not. We don't want to retry media errors
2126 * because the drive itself has probably already taken 10-30 seconds
2127 * doing its own internal retries before reporting the failure.
2129 static inline int ata_eh_worth_retry(struct ata_queued_cmd *qc)
2131 if (qc->err_mask & AC_ERR_MEDIA)
2132 return 0; /* don't retry media errors */
2133 if (qc->flags & ATA_QCFLAG_IO)
2134 return 1; /* otherwise retry anything from fs stack */
2135 if (qc->err_mask & AC_ERR_INVALID)
2136 return 0; /* don't retry these */
2137 return qc->err_mask != AC_ERR_DEV; /* retry if not dev error */
2141 * ata_eh_link_autopsy - analyze error and determine recovery action
2142 * @link: host link to perform autopsy on
2144 * Analyze why @link failed and determine which recovery actions
2145 * are needed. This function also sets more detailed AC_ERR_*
2146 * values and fills sense data for ATAPI CHECK SENSE.
2149 * Kernel thread context (may sleep).
2151 static void ata_eh_link_autopsy(struct ata_link *link)
2153 struct ata_port *ap = link->ap;
2154 struct ata_eh_context *ehc = &link->eh_context;
2155 struct ata_device *dev;
2156 unsigned int all_err_mask = 0, eflags = 0;
2163 if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
2166 /* obtain and analyze SError */
2167 rc = sata_scr_read(link, SCR_ERROR, &serror);
2169 ehc->i.serror |= serror;
2170 ata_eh_analyze_serror(link);
2171 } else if (rc != -EOPNOTSUPP) {
2172 /* SError read failed, force reset and probing */
2173 ehc->i.probe_mask |= ATA_ALL_DEVICES;
2174 ehc->i.action |= ATA_EH_RESET;
2175 ehc->i.err_mask |= AC_ERR_OTHER;
2178 /* analyze NCQ failure */
2179 ata_eh_analyze_ncq_error(link);
2181 /* any real error trumps AC_ERR_OTHER */
2182 if (ehc->i.err_mask & ~AC_ERR_OTHER)
2183 ehc->i.err_mask &= ~AC_ERR_OTHER;
2185 all_err_mask |= ehc->i.err_mask;
2187 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2188 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2190 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2191 ata_dev_phys_link(qc->dev) != link)
2194 /* inherit upper level err_mask */
2195 qc->err_mask |= ehc->i.err_mask;
2198 ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
2200 /* DEV errors are probably spurious in case of ATA_BUS error */
2201 if (qc->err_mask & AC_ERR_ATA_BUS)
2202 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
2205 /* any real error trumps unknown error */
2206 if (qc->err_mask & ~AC_ERR_OTHER)
2207 qc->err_mask &= ~AC_ERR_OTHER;
2210 * SENSE_VALID trumps dev/unknown error and revalidation. Upper
2211 * layers will determine whether the command is worth retrying
2212 * based on the sense data and device class/type. Otherwise,
2213 * determine directly if the command is worth retrying using its
2214 * error mask and flags.
2216 if (qc->flags & ATA_QCFLAG_SENSE_VALID)
2217 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
2218 else if (ata_eh_worth_retry(qc))
2219 qc->flags |= ATA_QCFLAG_RETRY;
2221 /* accumulate error info */
2222 ehc->i.dev = qc->dev;
2223 all_err_mask |= qc->err_mask;
2224 if (qc->flags & ATA_QCFLAG_IO)
2225 eflags |= ATA_EFLAG_IS_IO;
2226 trace_ata_eh_link_autopsy_qc(qc);
2229 /* enforce default EH actions */
2230 if (ap->pflags & ATA_PFLAG_FROZEN ||
2231 all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
2232 ehc->i.action |= ATA_EH_RESET;
2233 else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) ||
2234 (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV)))
2235 ehc->i.action |= ATA_EH_REVALIDATE;
2237 /* If we have offending qcs and the associated failed device,
2238 * perform per-dev EH action only on the offending device.
2241 ehc->i.dev_action[ehc->i.dev->devno] |=
2242 ehc->i.action & ATA_EH_PERDEV_MASK;
2243 ehc->i.action &= ~ATA_EH_PERDEV_MASK;
2246 /* propagate timeout to host link */
2247 if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link))
2248 ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT;
2250 /* record error and consider speeding down */
2252 if (!dev && ((ata_link_max_devices(link) == 1 &&
2253 ata_dev_enabled(link->device))))
2257 if (dev->flags & ATA_DFLAG_DUBIOUS_XFER)
2258 eflags |= ATA_EFLAG_DUBIOUS_XFER;
2259 ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
2260 trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask);
2266 * ata_eh_autopsy - analyze error and determine recovery action
2267 * @ap: host port to perform autopsy on
2269 * Analyze all links of @ap and determine why they failed and
2270 * which recovery actions are needed.
2273 * Kernel thread context (may sleep).
2275 void ata_eh_autopsy(struct ata_port *ap)
2277 struct ata_link *link;
2279 ata_for_each_link(link, ap, EDGE)
2280 ata_eh_link_autopsy(link);
2282 /* Handle the frigging slave link. Autopsy is done similarly
2283 * but actions and flags are transferred over to the master
2284 * link and handled from there.
2286 if (ap->slave_link) {
2287 struct ata_eh_context *mehc = &ap->link.eh_context;
2288 struct ata_eh_context *sehc = &ap->slave_link->eh_context;
2290 /* transfer control flags from master to slave */
2291 sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
2293 /* perform autopsy on the slave link */
2294 ata_eh_link_autopsy(ap->slave_link);
2296 /* transfer actions from slave to master and clear slave */
2297 ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2298 mehc->i.action |= sehc->i.action;
2299 mehc->i.dev_action[1] |= sehc->i.dev_action[1];
2300 mehc->i.flags |= sehc->i.flags;
2301 ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2304 /* Autopsy of fanout ports can affect host link autopsy.
2305 * Perform host link autopsy last.
2307 if (sata_pmp_attached(ap))
2308 ata_eh_link_autopsy(&ap->link);
2312 * ata_get_cmd_descript - get description for ATA command
2313 * @command: ATA command code to get description for
2315 * Return a textual description of the given command, or NULL if the
2316 * command is not known.
2321 const char *ata_get_cmd_descript(u8 command)
2323 #ifdef CONFIG_ATA_VERBOSE_ERROR
2329 { ATA_CMD_DEV_RESET, "DEVICE RESET" },
2330 { ATA_CMD_CHK_POWER, "CHECK POWER MODE" },
2331 { ATA_CMD_STANDBY, "STANDBY" },
2332 { ATA_CMD_IDLE, "IDLE" },
2333 { ATA_CMD_EDD, "EXECUTE DEVICE DIAGNOSTIC" },
2334 { ATA_CMD_DOWNLOAD_MICRO, "DOWNLOAD MICROCODE" },
2335 { ATA_CMD_DOWNLOAD_MICRO_DMA, "DOWNLOAD MICROCODE DMA" },
2336 { ATA_CMD_NOP, "NOP" },
2337 { ATA_CMD_FLUSH, "FLUSH CACHE" },
2338 { ATA_CMD_FLUSH_EXT, "FLUSH CACHE EXT" },
2339 { ATA_CMD_ID_ATA, "IDENTIFY DEVICE" },
2340 { ATA_CMD_ID_ATAPI, "IDENTIFY PACKET DEVICE" },
2341 { ATA_CMD_SERVICE, "SERVICE" },
2342 { ATA_CMD_READ, "READ DMA" },
2343 { ATA_CMD_READ_EXT, "READ DMA EXT" },
2344 { ATA_CMD_READ_QUEUED, "READ DMA QUEUED" },
2345 { ATA_CMD_READ_STREAM_EXT, "READ STREAM EXT" },
2346 { ATA_CMD_READ_STREAM_DMA_EXT, "READ STREAM DMA EXT" },
2347 { ATA_CMD_WRITE, "WRITE DMA" },
2348 { ATA_CMD_WRITE_EXT, "WRITE DMA EXT" },
2349 { ATA_CMD_WRITE_QUEUED, "WRITE DMA QUEUED EXT" },
2350 { ATA_CMD_WRITE_STREAM_EXT, "WRITE STREAM EXT" },
2351 { ATA_CMD_WRITE_STREAM_DMA_EXT, "WRITE STREAM DMA EXT" },
2352 { ATA_CMD_WRITE_FUA_EXT, "WRITE DMA FUA EXT" },
2353 { ATA_CMD_WRITE_QUEUED_FUA_EXT, "WRITE DMA QUEUED FUA EXT" },
2354 { ATA_CMD_FPDMA_READ, "READ FPDMA QUEUED" },
2355 { ATA_CMD_FPDMA_WRITE, "WRITE FPDMA QUEUED" },
2356 { ATA_CMD_FPDMA_SEND, "SEND FPDMA QUEUED" },
2357 { ATA_CMD_FPDMA_RECV, "RECEIVE FPDMA QUEUED" },
2358 { ATA_CMD_PIO_READ, "READ SECTOR(S)" },
2359 { ATA_CMD_PIO_READ_EXT, "READ SECTOR(S) EXT" },
2360 { ATA_CMD_PIO_WRITE, "WRITE SECTOR(S)" },
2361 { ATA_CMD_PIO_WRITE_EXT, "WRITE SECTOR(S) EXT" },
2362 { ATA_CMD_READ_MULTI, "READ MULTIPLE" },
2363 { ATA_CMD_READ_MULTI_EXT, "READ MULTIPLE EXT" },
2364 { ATA_CMD_WRITE_MULTI, "WRITE MULTIPLE" },
2365 { ATA_CMD_WRITE_MULTI_EXT, "WRITE MULTIPLE EXT" },
2366 { ATA_CMD_WRITE_MULTI_FUA_EXT, "WRITE MULTIPLE FUA EXT" },
2367 { ATA_CMD_SET_FEATURES, "SET FEATURES" },
2368 { ATA_CMD_SET_MULTI, "SET MULTIPLE MODE" },
2369 { ATA_CMD_VERIFY, "READ VERIFY SECTOR(S)" },
2370 { ATA_CMD_VERIFY_EXT, "READ VERIFY SECTOR(S) EXT" },
2371 { ATA_CMD_WRITE_UNCORR_EXT, "WRITE UNCORRECTABLE EXT" },
2372 { ATA_CMD_STANDBYNOW1, "STANDBY IMMEDIATE" },
2373 { ATA_CMD_IDLEIMMEDIATE, "IDLE IMMEDIATE" },
2374 { ATA_CMD_SLEEP, "SLEEP" },
2375 { ATA_CMD_INIT_DEV_PARAMS, "INITIALIZE DEVICE PARAMETERS" },
2376 { ATA_CMD_READ_NATIVE_MAX, "READ NATIVE MAX ADDRESS" },
2377 { ATA_CMD_READ_NATIVE_MAX_EXT, "READ NATIVE MAX ADDRESS EXT" },
2378 { ATA_CMD_SET_MAX, "SET MAX ADDRESS" },
2379 { ATA_CMD_SET_MAX_EXT, "SET MAX ADDRESS EXT" },
2380 { ATA_CMD_READ_LOG_EXT, "READ LOG EXT" },
2381 { ATA_CMD_WRITE_LOG_EXT, "WRITE LOG EXT" },
2382 { ATA_CMD_READ_LOG_DMA_EXT, "READ LOG DMA EXT" },
2383 { ATA_CMD_WRITE_LOG_DMA_EXT, "WRITE LOG DMA EXT" },
2384 { ATA_CMD_TRUSTED_NONDATA, "TRUSTED NON-DATA" },
2385 { ATA_CMD_TRUSTED_RCV, "TRUSTED RECEIVE" },
2386 { ATA_CMD_TRUSTED_RCV_DMA, "TRUSTED RECEIVE DMA" },
2387 { ATA_CMD_TRUSTED_SND, "TRUSTED SEND" },
2388 { ATA_CMD_TRUSTED_SND_DMA, "TRUSTED SEND DMA" },
2389 { ATA_CMD_PMP_READ, "READ BUFFER" },
2390 { ATA_CMD_PMP_READ_DMA, "READ BUFFER DMA" },
2391 { ATA_CMD_PMP_WRITE, "WRITE BUFFER" },
2392 { ATA_CMD_PMP_WRITE_DMA, "WRITE BUFFER DMA" },
2393 { ATA_CMD_CONF_OVERLAY, "DEVICE CONFIGURATION OVERLAY" },
2394 { ATA_CMD_SEC_SET_PASS, "SECURITY SET PASSWORD" },
2395 { ATA_CMD_SEC_UNLOCK, "SECURITY UNLOCK" },
2396 { ATA_CMD_SEC_ERASE_PREP, "SECURITY ERASE PREPARE" },
2397 { ATA_CMD_SEC_ERASE_UNIT, "SECURITY ERASE UNIT" },
2398 { ATA_CMD_SEC_FREEZE_LOCK, "SECURITY FREEZE LOCK" },
2399 { ATA_CMD_SEC_DISABLE_PASS, "SECURITY DISABLE PASSWORD" },
2400 { ATA_CMD_CONFIG_STREAM, "CONFIGURE STREAM" },
2401 { ATA_CMD_SMART, "SMART" },
2402 { ATA_CMD_MEDIA_LOCK, "DOOR LOCK" },
2403 { ATA_CMD_MEDIA_UNLOCK, "DOOR UNLOCK" },
2404 { ATA_CMD_DSM, "DATA SET MANAGEMENT" },
2405 { ATA_CMD_CHK_MED_CRD_TYP, "CHECK MEDIA CARD TYPE" },
2406 { ATA_CMD_CFA_REQ_EXT_ERR, "CFA REQUEST EXTENDED ERROR" },
2407 { ATA_CMD_CFA_WRITE_NE, "CFA WRITE SECTORS WITHOUT ERASE" },
2408 { ATA_CMD_CFA_TRANS_SECT, "CFA TRANSLATE SECTOR" },
2409 { ATA_CMD_CFA_ERASE, "CFA ERASE SECTORS" },
2410 { ATA_CMD_CFA_WRITE_MULT_NE, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2411 { ATA_CMD_REQ_SENSE_DATA, "REQUEST SENSE DATA EXT" },
2412 { ATA_CMD_SANITIZE_DEVICE, "SANITIZE DEVICE" },
2413 { ATA_CMD_READ_LONG, "READ LONG (with retries)" },
2414 { ATA_CMD_READ_LONG_ONCE, "READ LONG (without retries)" },
2415 { ATA_CMD_WRITE_LONG, "WRITE LONG (with retries)" },
2416 { ATA_CMD_WRITE_LONG_ONCE, "WRITE LONG (without retries)" },
2417 { ATA_CMD_RESTORE, "RECALIBRATE" },
2418 { 0, NULL } /* terminate list */
2422 for (i = 0; cmd_descr[i].text; i++)
2423 if (cmd_descr[i].command == command)
2424 return cmd_descr[i].text;
2429 EXPORT_SYMBOL_GPL(ata_get_cmd_descript);
2432 * ata_eh_link_report - report error handling to user
2433 * @link: ATA link EH is going on
2435 * Report EH to user.
2440 static void ata_eh_link_report(struct ata_link *link)
2442 struct ata_port *ap = link->ap;
2443 struct ata_eh_context *ehc = &link->eh_context;
2444 const char *frozen, *desc;
2445 char tries_buf[6] = "";
2446 int tag, nr_failed = 0;
2448 if (ehc->i.flags & ATA_EHI_QUIET)
2452 if (ehc->i.desc[0] != '\0')
2455 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2456 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2458 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2459 ata_dev_phys_link(qc->dev) != link ||
2460 ((qc->flags & ATA_QCFLAG_QUIET) &&
2461 qc->err_mask == AC_ERR_DEV))
2463 if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
2469 if (!nr_failed && !ehc->i.err_mask)
2473 if (ap->pflags & ATA_PFLAG_FROZEN)
2476 if (ap->eh_tries < ATA_EH_MAX_TRIES)
2477 snprintf(tries_buf, sizeof(tries_buf), " t%d",
2481 ata_dev_err(ehc->i.dev, "exception Emask 0x%x "
2482 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2483 ehc->i.err_mask, link->sactive, ehc->i.serror,
2484 ehc->i.action, frozen, tries_buf);
2486 ata_dev_err(ehc->i.dev, "%s\n", desc);
2488 ata_link_err(link, "exception Emask 0x%x "
2489 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2490 ehc->i.err_mask, link->sactive, ehc->i.serror,
2491 ehc->i.action, frozen, tries_buf);
2493 ata_link_err(link, "%s\n", desc);
2496 #ifdef CONFIG_ATA_VERBOSE_ERROR
2499 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2500 ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "",
2501 ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "",
2502 ehc->i.serror & SERR_DATA ? "UnrecovData " : "",
2503 ehc->i.serror & SERR_PERSISTENT ? "Persist " : "",
2504 ehc->i.serror & SERR_PROTOCOL ? "Proto " : "",
2505 ehc->i.serror & SERR_INTERNAL ? "HostInt " : "",
2506 ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "",
2507 ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "",
2508 ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "",
2509 ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "",
2510 ehc->i.serror & SERR_DISPARITY ? "Dispar " : "",
2511 ehc->i.serror & SERR_CRC ? "BadCRC " : "",
2512 ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "",
2513 ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "",
2514 ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "",
2515 ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "",
2516 ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : "");
2519 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2520 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2521 struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
2522 char data_buf[20] = "";
2523 char cdb_buf[70] = "";
2525 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2526 ata_dev_phys_link(qc->dev) != link || !qc->err_mask)
2529 if (qc->dma_dir != DMA_NONE) {
2530 static const char *dma_str[] = {
2531 [DMA_BIDIRECTIONAL] = "bidi",
2532 [DMA_TO_DEVICE] = "out",
2533 [DMA_FROM_DEVICE] = "in",
2535 static const char *prot_str[] = {
2536 [ATA_PROT_PIO] = "pio",
2537 [ATA_PROT_DMA] = "dma",
2538 [ATA_PROT_NCQ] = "ncq",
2539 [ATAPI_PROT_PIO] = "pio",
2540 [ATAPI_PROT_DMA] = "dma",
2543 snprintf(data_buf, sizeof(data_buf), " %s %u %s",
2544 prot_str[qc->tf.protocol], qc->nbytes,
2545 dma_str[qc->dma_dir]);
2548 if (ata_is_atapi(qc->tf.protocol)) {
2549 const u8 *cdb = qc->cdb;
2550 size_t cdb_len = qc->dev->cdb_len;
2553 cdb = qc->scsicmd->cmnd;
2554 cdb_len = qc->scsicmd->cmd_len;
2556 __scsi_format_command(cdb_buf, sizeof(cdb_buf),
2559 const char *descr = ata_get_cmd_descript(cmd->command);
2561 ata_dev_err(qc->dev, "failed command: %s\n",
2565 ata_dev_err(qc->dev,
2566 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2568 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2569 "Emask 0x%x (%s)%s\n",
2570 cmd->command, cmd->feature, cmd->nsect,
2571 cmd->lbal, cmd->lbam, cmd->lbah,
2572 cmd->hob_feature, cmd->hob_nsect,
2573 cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,
2574 cmd->device, qc->tag, data_buf, cdb_buf,
2575 res->command, res->feature, res->nsect,
2576 res->lbal, res->lbam, res->lbah,
2577 res->hob_feature, res->hob_nsect,
2578 res->hob_lbal, res->hob_lbam, res->hob_lbah,
2579 res->device, qc->err_mask, ata_err_string(qc->err_mask),
2580 qc->err_mask & AC_ERR_NCQ ? " <F>" : "");
2582 #ifdef CONFIG_ATA_VERBOSE_ERROR
2583 if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ |
2585 if (res->command & ATA_BUSY)
2586 ata_dev_err(qc->dev, "status: { Busy }\n");
2588 ata_dev_err(qc->dev, "status: { %s%s%s%s}\n",
2589 res->command & ATA_DRDY ? "DRDY " : "",
2590 res->command & ATA_DF ? "DF " : "",
2591 res->command & ATA_DRQ ? "DRQ " : "",
2592 res->command & ATA_ERR ? "ERR " : "");
2595 if (cmd->command != ATA_CMD_PACKET &&
2596 (res->feature & (ATA_ICRC | ATA_UNC | ATA_AMNF |
2597 ATA_IDNF | ATA_ABORTED)))
2598 ata_dev_err(qc->dev, "error: { %s%s%s%s%s}\n",
2599 res->feature & ATA_ICRC ? "ICRC " : "",
2600 res->feature & ATA_UNC ? "UNC " : "",
2601 res->feature & ATA_AMNF ? "AMNF " : "",
2602 res->feature & ATA_IDNF ? "IDNF " : "",
2603 res->feature & ATA_ABORTED ? "ABRT " : "");
2609 * ata_eh_report - report error handling to user
2610 * @ap: ATA port to report EH about
2612 * Report EH to user.
2617 void ata_eh_report(struct ata_port *ap)
2619 struct ata_link *link;
2621 ata_for_each_link(link, ap, HOST_FIRST)
2622 ata_eh_link_report(link);
2625 static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
2626 unsigned int *classes, unsigned long deadline,
2629 struct ata_device *dev;
2632 ata_for_each_dev(dev, link, ALL)
2633 classes[dev->devno] = ATA_DEV_UNKNOWN;
2635 return reset(link, classes, deadline);
2638 static int ata_eh_followup_srst_needed(struct ata_link *link, int rc)
2640 if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link))
2644 if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
2649 int ata_eh_reset(struct ata_link *link, int classify,
2650 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
2651 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
2653 struct ata_port *ap = link->ap;
2654 struct ata_link *slave = ap->slave_link;
2655 struct ata_eh_context *ehc = &link->eh_context;
2656 struct ata_eh_context *sehc = slave ? &slave->eh_context : NULL;
2657 unsigned int *classes = ehc->classes;
2658 unsigned int lflags = link->flags;
2659 int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
2660 int max_tries = 0, try = 0;
2661 struct ata_link *failed_link;
2662 struct ata_device *dev;
2663 unsigned long deadline, now;
2664 ata_reset_fn_t reset;
2665 unsigned long flags;
2672 while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
2674 if (link->flags & ATA_LFLAG_RST_ONCE)
2676 if (link->flags & ATA_LFLAG_NO_HRST)
2678 if (link->flags & ATA_LFLAG_NO_SRST)
2681 /* make sure each reset attempt is at least COOL_DOWN apart */
2682 if (ehc->i.flags & ATA_EHI_DID_RESET) {
2684 WARN_ON(time_after(ehc->last_reset, now));
2685 deadline = ata_deadline(ehc->last_reset,
2686 ATA_EH_RESET_COOL_DOWN);
2687 if (time_before(now, deadline))
2688 schedule_timeout_uninterruptible(deadline - now);
2691 spin_lock_irqsave(ap->lock, flags);
2692 ap->pflags |= ATA_PFLAG_RESETTING;
2693 spin_unlock_irqrestore(ap->lock, flags);
2695 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
2697 ata_for_each_dev(dev, link, ALL) {
2698 /* If we issue an SRST then an ATA drive (not ATAPI)
2699 * may change configuration and be in PIO0 timing. If
2700 * we do a hard reset (or are coming from power on)
2701 * this is true for ATA or ATAPI. Until we've set a
2702 * suitable controller mode we should not touch the
2703 * bus as we may be talking too fast.
2705 dev->pio_mode = XFER_PIO_0;
2706 dev->dma_mode = 0xff;
2708 /* If the controller has a pio mode setup function
2709 * then use it to set the chipset to rights. Don't
2710 * touch the DMA setup as that will be dealt with when
2711 * configuring devices.
2713 if (ap->ops->set_piomode)
2714 ap->ops->set_piomode(ap, dev);
2717 /* prefer hardreset */
2719 ehc->i.action &= ~ATA_EH_RESET;
2722 ehc->i.action |= ATA_EH_HARDRESET;
2723 } else if (softreset) {
2725 ehc->i.action |= ATA_EH_SOFTRESET;
2729 unsigned long deadline = ata_deadline(jiffies,
2730 ATA_EH_PRERESET_TIMEOUT);
2733 sehc->i.action &= ~ATA_EH_RESET;
2734 sehc->i.action |= ehc->i.action;
2737 rc = prereset(link, deadline);
2739 /* If present, do prereset on slave link too. Reset
2740 * is skipped iff both master and slave links report
2741 * -ENOENT or clear ATA_EH_RESET.
2743 if (slave && (rc == 0 || rc == -ENOENT)) {
2746 tmp = prereset(slave, deadline);
2750 ehc->i.action |= sehc->i.action;
2754 if (rc == -ENOENT) {
2755 ata_link_dbg(link, "port disabled--ignoring\n");
2756 ehc->i.action &= ~ATA_EH_RESET;
2758 ata_for_each_dev(dev, link, ALL)
2759 classes[dev->devno] = ATA_DEV_NONE;
2764 "prereset failed (errno=%d)\n",
2769 /* prereset() might have cleared ATA_EH_RESET. If so,
2770 * bang classes, thaw and return.
2772 if (reset && !(ehc->i.action & ATA_EH_RESET)) {
2773 ata_for_each_dev(dev, link, ALL)
2774 classes[dev->devno] = ATA_DEV_NONE;
2775 if ((ap->pflags & ATA_PFLAG_FROZEN) &&
2776 ata_is_host_link(link))
2777 ata_eh_thaw_port(ap);
2787 if (ata_is_host_link(link))
2788 ata_eh_freeze_port(ap);
2790 deadline = ata_deadline(jiffies, ata_eh_reset_timeouts[try++]);
2794 ata_link_info(link, "%s resetting link\n",
2795 reset == softreset ? "soft" : "hard");
2797 /* mark that this EH session started with reset */
2798 ehc->last_reset = jiffies;
2799 if (reset == hardreset)
2800 ehc->i.flags |= ATA_EHI_DID_HARDRESET;
2802 ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
2804 rc = ata_do_reset(link, reset, classes, deadline, true);
2805 if (rc && rc != -EAGAIN) {
2810 /* hardreset slave link if existent */
2811 if (slave && reset == hardreset) {
2815 ata_link_info(slave, "hard resetting link\n");
2817 ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
2818 tmp = ata_do_reset(slave, reset, classes, deadline,
2826 failed_link = slave;
2832 /* perform follow-up SRST if necessary */
2833 if (reset == hardreset &&
2834 ata_eh_followup_srst_needed(link, rc)) {
2839 "follow-up softreset required but no softreset available\n");
2845 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
2846 rc = ata_do_reset(link, reset, classes, deadline, true);
2855 "no reset method available, skipping reset\n");
2856 if (!(lflags & ATA_LFLAG_ASSUME_CLASS))
2857 lflags |= ATA_LFLAG_ASSUME_ATA;
2861 * Post-reset processing
2863 ata_for_each_dev(dev, link, ALL) {
2864 /* After the reset, the device state is PIO 0 and the
2865 * controller state is undefined. Reset also wakes up
2866 * drives from sleeping mode.
2868 dev->pio_mode = XFER_PIO_0;
2869 dev->flags &= ~ATA_DFLAG_SLEEPING;
2871 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
2874 /* apply class override */
2875 if (lflags & ATA_LFLAG_ASSUME_ATA)
2876 classes[dev->devno] = ATA_DEV_ATA;
2877 else if (lflags & ATA_LFLAG_ASSUME_SEMB)
2878 classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
2881 /* record current link speed */
2882 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
2883 link->sata_spd = (sstatus >> 4) & 0xf;
2884 if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0)
2885 slave->sata_spd = (sstatus >> 4) & 0xf;
2888 if (ata_is_host_link(link))
2889 ata_eh_thaw_port(ap);
2891 /* postreset() should clear hardware SError. Although SError
2892 * is cleared during link resume, clearing SError here is
2893 * necessary as some PHYs raise hotplug events after SRST.
2894 * This introduces race condition where hotplug occurs between
2895 * reset and here. This race is mediated by cross checking
2896 * link onlineness and classification result later.
2899 postreset(link, classes);
2901 postreset(slave, classes);
2905 * Some controllers can't be frozen very well and may set spurious
2906 * error conditions during reset. Clear accumulated error
2907 * information and re-thaw the port if frozen. As reset is the
2908 * final recovery action and we cross check link onlineness against
2909 * device classification later, no hotplug event is lost by this.
2911 spin_lock_irqsave(link->ap->lock, flags);
2912 memset(&link->eh_info, 0, sizeof(link->eh_info));
2914 memset(&slave->eh_info, 0, sizeof(link->eh_info));
2915 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
2916 spin_unlock_irqrestore(link->ap->lock, flags);
2918 if (ap->pflags & ATA_PFLAG_FROZEN)
2919 ata_eh_thaw_port(ap);
2922 * Make sure onlineness and classification result correspond.
2923 * Hotplug could have happened during reset and some
2924 * controllers fail to wait while a drive is spinning up after
2925 * being hotplugged causing misdetection. By cross checking
2926 * link on/offlineness and classification result, those
2927 * conditions can be reliably detected and retried.
2930 ata_for_each_dev(dev, link, ALL) {
2931 if (ata_phys_link_online(ata_dev_phys_link(dev))) {
2932 if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
2933 ata_dev_dbg(dev, "link online but device misclassified\n");
2934 classes[dev->devno] = ATA_DEV_NONE;
2937 } else if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
2938 if (ata_class_enabled(classes[dev->devno]))
2940 "link offline, clearing class %d to NONE\n",
2941 classes[dev->devno]);
2942 classes[dev->devno] = ATA_DEV_NONE;
2943 } else if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
2945 "link status unknown, clearing UNKNOWN to NONE\n");
2946 classes[dev->devno] = ATA_DEV_NONE;
2950 if (classify && nr_unknown) {
2951 if (try < max_tries) {
2953 "link online but %d devices misclassified, retrying\n",
2960 "link online but %d devices misclassified, "
2961 "device detection might fail\n", nr_unknown);
2964 /* reset successful, schedule revalidation */
2965 ata_eh_done(link, NULL, ATA_EH_RESET);
2967 ata_eh_done(slave, NULL, ATA_EH_RESET);
2968 ehc->last_reset = jiffies; /* update to completion time */
2969 ehc->i.action |= ATA_EH_REVALIDATE;
2970 link->lpm_policy = ATA_LPM_UNKNOWN; /* reset LPM state */
2974 /* clear hotplug flag */
2975 ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
2977 sehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
2979 spin_lock_irqsave(ap->lock, flags);
2980 ap->pflags &= ~ATA_PFLAG_RESETTING;
2981 spin_unlock_irqrestore(ap->lock, flags);
2986 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2987 if (!ata_is_host_link(link) &&
2988 sata_scr_read(link, SCR_STATUS, &sstatus))
2991 if (try >= max_tries) {
2993 * Thaw host port even if reset failed, so that the port
2994 * can be retried on the next phy event. This risks
2995 * repeated EH runs but seems to be a better tradeoff than
2996 * shutting down a port after a botched hotplug attempt.
2998 if (ata_is_host_link(link))
2999 ata_eh_thaw_port(ap);
3004 if (time_before(now, deadline)) {
3005 unsigned long delta = deadline - now;
3007 ata_link_warn(failed_link,
3008 "reset failed (errno=%d), retrying in %u secs\n",
3009 rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
3013 delta = schedule_timeout_uninterruptible(delta);
3018 * While disks spinup behind PMP, some controllers fail sending SRST.
3019 * They need to be reset - as well as the PMP - before retrying.
3021 if (rc == -ERESTART) {
3022 if (ata_is_host_link(link))
3023 ata_eh_thaw_port(ap);
3027 if (try == max_tries - 1) {
3028 sata_down_spd_limit(link, 0);
3030 sata_down_spd_limit(slave, 0);
3031 } else if (rc == -EPIPE)
3032 sata_down_spd_limit(failed_link, 0);
3039 static inline void ata_eh_pull_park_action(struct ata_port *ap)
3041 struct ata_link *link;
3042 struct ata_device *dev;
3043 unsigned long flags;
3046 * This function can be thought of as an extended version of
3047 * ata_eh_about_to_do() specially crafted to accommodate the
3048 * requirements of ATA_EH_PARK handling. Since the EH thread
3049 * does not leave the do {} while () loop in ata_eh_recover as
3050 * long as the timeout for a park request to *one* device on
3051 * the port has not expired, and since we still want to pick
3052 * up park requests to other devices on the same port or
3053 * timeout updates for the same device, we have to pull
3054 * ATA_EH_PARK actions from eh_info into eh_context.i
3055 * ourselves at the beginning of each pass over the loop.
3057 * Additionally, all write accesses to &ap->park_req_pending
3058 * through reinit_completion() (see below) or complete_all()
3059 * (see ata_scsi_park_store()) are protected by the host lock.
3060 * As a result we have that park_req_pending.done is zero on
3061 * exit from this function, i.e. when ATA_EH_PARK actions for
3062 * *all* devices on port ap have been pulled into the
3063 * respective eh_context structs. If, and only if,
3064 * park_req_pending.done is non-zero by the time we reach
3065 * wait_for_completion_timeout(), another ATA_EH_PARK action
3066 * has been scheduled for at least one of the devices on port
3067 * ap and we have to cycle over the do {} while () loop in
3068 * ata_eh_recover() again.
3071 spin_lock_irqsave(ap->lock, flags);
3072 reinit_completion(&ap->park_req_pending);
3073 ata_for_each_link(link, ap, EDGE) {
3074 ata_for_each_dev(dev, link, ALL) {
3075 struct ata_eh_info *ehi = &link->eh_info;
3077 link->eh_context.i.dev_action[dev->devno] |=
3078 ehi->dev_action[dev->devno] & ATA_EH_PARK;
3079 ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK);
3082 spin_unlock_irqrestore(ap->lock, flags);
3085 static void ata_eh_park_issue_cmd(struct ata_device *dev, int park)
3087 struct ata_eh_context *ehc = &dev->link->eh_context;
3088 struct ata_taskfile tf;
3089 unsigned int err_mask;
3091 ata_tf_init(dev, &tf);
3093 ehc->unloaded_mask |= 1 << dev->devno;
3094 tf.command = ATA_CMD_IDLEIMMEDIATE;
3100 ehc->unloaded_mask &= ~(1 << dev->devno);
3101 tf.command = ATA_CMD_CHK_POWER;
3104 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3105 tf.protocol |= ATA_PROT_NODATA;
3106 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3107 if (park && (err_mask || tf.lbal != 0xc4)) {
3108 ata_dev_err(dev, "head unload failed!\n");
3109 ehc->unloaded_mask &= ~(1 << dev->devno);
3113 static int ata_eh_revalidate_and_attach(struct ata_link *link,
3114 struct ata_device **r_failed_dev)
3116 struct ata_port *ap = link->ap;
3117 struct ata_eh_context *ehc = &link->eh_context;
3118 struct ata_device *dev;
3119 unsigned int new_mask = 0;
3120 unsigned long flags;
3125 /* For PATA drive side cable detection to work, IDENTIFY must
3126 * be done backwards such that PDIAG- is released by the slave
3127 * device before the master device is identified.
3129 ata_for_each_dev(dev, link, ALL_REVERSE) {
3130 unsigned int action = ata_eh_dev_action(dev);
3131 unsigned int readid_flags = 0;
3133 if (ehc->i.flags & ATA_EHI_DID_RESET)
3134 readid_flags |= ATA_READID_POSTRESET;
3136 if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
3137 WARN_ON(dev->class == ATA_DEV_PMP);
3139 if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
3144 ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE);
3145 rc = ata_dev_revalidate(dev, ehc->classes[dev->devno],
3150 ata_eh_done(link, dev, ATA_EH_REVALIDATE);
3152 /* Configuration may have changed, reconfigure
3155 ehc->i.flags |= ATA_EHI_SETMODE;
3157 /* schedule the scsi_rescan_device() here */
3158 schedule_work(&(ap->scsi_rescan_task));
3159 } else if (dev->class == ATA_DEV_UNKNOWN &&
3160 ehc->tries[dev->devno] &&
3161 ata_class_enabled(ehc->classes[dev->devno])) {
3162 /* Temporarily set dev->class, it will be
3163 * permanently set once all configurations are
3164 * complete. This is necessary because new
3165 * device configuration is done in two
3168 dev->class = ehc->classes[dev->devno];
3170 if (dev->class == ATA_DEV_PMP)
3171 rc = sata_pmp_attach(dev);
3173 rc = ata_dev_read_id(dev, &dev->class,
3174 readid_flags, dev->id);
3176 /* read_id might have changed class, store and reset */
3177 ehc->classes[dev->devno] = dev->class;
3178 dev->class = ATA_DEV_UNKNOWN;
3182 /* clear error info accumulated during probe */
3183 ata_ering_clear(&dev->ering);
3184 new_mask |= 1 << dev->devno;
3187 /* IDENTIFY was issued to non-existent
3188 * device. No need to reset. Just
3189 * thaw and ignore the device.
3191 ata_eh_thaw_port(ap);
3199 /* PDIAG- should have been released, ask cable type if post-reset */
3200 if ((ehc->i.flags & ATA_EHI_DID_RESET) && ata_is_host_link(link)) {
3201 if (ap->ops->cable_detect)
3202 ap->cbl = ap->ops->cable_detect(ap);
3206 /* Configure new devices forward such that user doesn't see
3207 * device detection messages backwards.
3209 ata_for_each_dev(dev, link, ALL) {
3210 if (!(new_mask & (1 << dev->devno)))
3213 dev->class = ehc->classes[dev->devno];
3215 if (dev->class == ATA_DEV_PMP)
3218 ehc->i.flags |= ATA_EHI_PRINTINFO;
3219 rc = ata_dev_configure(dev);
3220 ehc->i.flags &= ~ATA_EHI_PRINTINFO;
3222 dev->class = ATA_DEV_UNKNOWN;
3226 spin_lock_irqsave(ap->lock, flags);
3227 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
3228 spin_unlock_irqrestore(ap->lock, flags);
3230 /* new device discovered, configure xfermode */
3231 ehc->i.flags |= ATA_EHI_SETMODE;
3237 *r_failed_dev = dev;
3238 DPRINTK("EXIT rc=%d\n", rc);
3243 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3244 * @link: link on which timings will be programmed
3245 * @r_failed_dev: out parameter for failed device
3247 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3248 * ata_set_mode() fails, pointer to the failing device is
3249 * returned in @r_failed_dev.
3252 * PCI/etc. bus probe sem.
3255 * 0 on success, negative errno otherwise
3257 int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3259 struct ata_port *ap = link->ap;
3260 struct ata_device *dev;
3263 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
3264 ata_for_each_dev(dev, link, ENABLED) {
3265 if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) {
3266 struct ata_ering_entry *ent;
3268 ent = ata_ering_top(&dev->ering);
3270 ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER;
3274 /* has private set_mode? */
3275 if (ap->ops->set_mode)
3276 rc = ap->ops->set_mode(link, r_failed_dev);
3278 rc = ata_do_set_mode(link, r_failed_dev);
3280 /* if transfer mode has changed, set DUBIOUS_XFER on device */
3281 ata_for_each_dev(dev, link, ENABLED) {
3282 struct ata_eh_context *ehc = &link->eh_context;
3283 u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
3284 u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
3286 if (dev->xfer_mode != saved_xfer_mode ||
3287 ata_ncq_enabled(dev) != saved_ncq)
3288 dev->flags |= ATA_DFLAG_DUBIOUS_XFER;
3295 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3296 * @dev: ATAPI device to clear UA for
3298 * Resets and other operations can make an ATAPI device raise
3299 * UNIT ATTENTION which causes the next operation to fail. This
3300 * function clears UA.
3303 * EH context (may sleep).
3306 * 0 on success, -errno on failure.
3308 static int atapi_eh_clear_ua(struct ata_device *dev)
3312 for (i = 0; i < ATA_EH_UA_TRIES; i++) {
3313 u8 *sense_buffer = dev->link->ap->sector_buf;
3315 unsigned int err_mask;
3317 err_mask = atapi_eh_tur(dev, &sense_key);
3318 if (err_mask != 0 && err_mask != AC_ERR_DEV) {
3320 "TEST_UNIT_READY failed (err_mask=0x%x)\n",
3325 if (!err_mask || sense_key != UNIT_ATTENTION)
3328 err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
3330 ata_dev_warn(dev, "failed to clear "
3331 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
3336 ata_dev_warn(dev, "UNIT ATTENTION persists after %d tries\n",
3343 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3344 * @dev: ATA device which may need FLUSH retry
3346 * If @dev failed FLUSH, it needs to be reported upper layer
3347 * immediately as it means that @dev failed to remap and already
3348 * lost at least a sector and further FLUSH retrials won't make
3349 * any difference to the lost sector. However, if FLUSH failed
3350 * for other reasons, for example transmission error, FLUSH needs
3353 * This function determines whether FLUSH failure retry is
3354 * necessary and performs it if so.
3357 * 0 if EH can continue, -errno if EH needs to be repeated.
3359 static int ata_eh_maybe_retry_flush(struct ata_device *dev)
3361 struct ata_link *link = dev->link;
3362 struct ata_port *ap = link->ap;
3363 struct ata_queued_cmd *qc;
3364 struct ata_taskfile tf;
3365 unsigned int err_mask;
3368 /* did flush fail for this device? */
3369 if (!ata_tag_valid(link->active_tag))
3372 qc = __ata_qc_from_tag(ap, link->active_tag);
3373 if (qc->dev != dev || (qc->tf.command != ATA_CMD_FLUSH_EXT &&
3374 qc->tf.command != ATA_CMD_FLUSH))
3377 /* if the device failed it, it should be reported to upper layers */
3378 if (qc->err_mask & AC_ERR_DEV)
3381 /* flush failed for some other reason, give it another shot */
3382 ata_tf_init(dev, &tf);
3384 tf.command = qc->tf.command;
3385 tf.flags |= ATA_TFLAG_DEVICE;
3386 tf.protocol = ATA_PROT_NODATA;
3388 ata_dev_warn(dev, "retrying FLUSH 0x%x Emask 0x%x\n",
3389 tf.command, qc->err_mask);
3391 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3394 * FLUSH is complete but there's no way to
3395 * successfully complete a failed command from EH.
3396 * Making sure retry is allowed at least once and
3397 * retrying it should do the trick - whatever was in
3398 * the cache is already on the platter and this won't
3399 * cause infinite loop.
3401 qc->scsicmd->allowed = max(qc->scsicmd->allowed, 1);
3403 ata_dev_warn(dev, "FLUSH failed Emask 0x%x\n",
3407 /* if device failed it, report it to upper layers */
3408 if (err_mask & AC_ERR_DEV) {
3409 qc->err_mask |= AC_ERR_DEV;
3411 if (!(ap->pflags & ATA_PFLAG_FROZEN))
3419 * ata_eh_set_lpm - configure SATA interface power management
3420 * @link: link to configure power management
3421 * @policy: the link power management policy
3422 * @r_failed_dev: out parameter for failed device
3424 * Enable SATA Interface power management. This will enable
3425 * Device Interface Power Management (DIPM) for min_power
3426 * policy, and then call driver specific callbacks for
3427 * enabling Host Initiated Power management.
3433 * 0 on success, -errno on failure.
3435 static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3436 struct ata_device **r_failed_dev)
3438 struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
3439 struct ata_eh_context *ehc = &link->eh_context;
3440 struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
3441 enum ata_lpm_policy old_policy = link->lpm_policy;
3442 bool no_dipm = link->ap->flags & ATA_FLAG_NO_DIPM;
3443 unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
3444 unsigned int err_mask;
3447 /* if the link or host doesn't do LPM, noop */
3448 if ((link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
3452 * DIPM is enabled only for MIN_POWER as some devices
3453 * misbehave when the host NACKs transition to SLUMBER. Order
3454 * device and link configurations such that the host always
3455 * allows DIPM requests.
3457 ata_for_each_dev(dev, link, ENABLED) {
3458 bool hipm = ata_id_has_hipm(dev->id);
3459 bool dipm = ata_id_has_dipm(dev->id) && !no_dipm;
3461 /* find the first enabled and LPM enabled devices */
3465 if (!lpm_dev && (hipm || dipm))
3468 hints &= ~ATA_LPM_EMPTY;
3470 hints &= ~ATA_LPM_HIPM;
3472 /* disable DIPM before changing link config */
3473 if (policy != ATA_LPM_MIN_POWER && dipm) {
3474 err_mask = ata_dev_set_feature(dev,
3475 SETFEATURES_SATA_DISABLE, SATA_DIPM);
3476 if (err_mask && err_mask != AC_ERR_DEV) {
3478 "failed to disable DIPM, Emask 0x%x\n",
3487 rc = ap->ops->set_lpm(link, policy, hints);
3488 if (!rc && ap->slave_link)
3489 rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
3491 rc = sata_pmp_set_lpm(link, policy, hints);
3494 * Attribute link config failure to the first (LPM) enabled
3495 * device on the link.
3498 if (rc == -EOPNOTSUPP) {
3499 link->flags |= ATA_LFLAG_NO_LPM;
3502 dev = lpm_dev ? lpm_dev : link_dev;
3507 * Low level driver acked the transition. Issue DIPM command
3508 * with the new policy set.
3510 link->lpm_policy = policy;
3511 if (ap && ap->slave_link)
3512 ap->slave_link->lpm_policy = policy;
3514 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3515 ata_for_each_dev(dev, link, ENABLED) {
3516 if (policy == ATA_LPM_MIN_POWER && !no_dipm &&
3517 ata_id_has_dipm(dev->id)) {
3518 err_mask = ata_dev_set_feature(dev,
3519 SETFEATURES_SATA_ENABLE, SATA_DIPM);
3520 if (err_mask && err_mask != AC_ERR_DEV) {
3522 "failed to enable DIPM, Emask 0x%x\n",
3530 link->last_lpm_change = jiffies;
3531 link->flags |= ATA_LFLAG_CHANGED;
3536 /* restore the old policy */
3537 link->lpm_policy = old_policy;
3538 if (ap && ap->slave_link)
3539 ap->slave_link->lpm_policy = old_policy;
3541 /* if no device or only one more chance is left, disable LPM */
3542 if (!dev || ehc->tries[dev->devno] <= 2) {
3543 ata_link_warn(link, "disabling LPM on the link\n");
3544 link->flags |= ATA_LFLAG_NO_LPM;
3547 *r_failed_dev = dev;
3551 int ata_link_nr_enabled(struct ata_link *link)
3553 struct ata_device *dev;
3556 ata_for_each_dev(dev, link, ENABLED)
3561 static int ata_link_nr_vacant(struct ata_link *link)
3563 struct ata_device *dev;
3566 ata_for_each_dev(dev, link, ALL)
3567 if (dev->class == ATA_DEV_UNKNOWN)
3572 static int ata_eh_skip_recovery(struct ata_link *link)
3574 struct ata_port *ap = link->ap;
3575 struct ata_eh_context *ehc = &link->eh_context;
3576 struct ata_device *dev;
3578 /* skip disabled links */
3579 if (link->flags & ATA_LFLAG_DISABLED)
3582 /* skip if explicitly requested */
3583 if (ehc->i.flags & ATA_EHI_NO_RECOVERY)
3586 /* thaw frozen port and recover failed devices */
3587 if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link))
3590 /* reset at least once if reset is requested */
3591 if ((ehc->i.action & ATA_EH_RESET) &&
3592 !(ehc->i.flags & ATA_EHI_DID_RESET))
3595 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
3596 ata_for_each_dev(dev, link, ALL) {
3597 if (dev->class == ATA_DEV_UNKNOWN &&
3598 ehc->classes[dev->devno] != ATA_DEV_NONE)
3605 static int ata_count_probe_trials_cb(struct ata_ering_entry *ent, void *void_arg)
3607 u64 interval = msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL);
3608 u64 now = get_jiffies_64();
3609 int *trials = void_arg;
3611 if ((ent->eflags & ATA_EFLAG_OLD_ER) ||
3612 (ent->timestamp < now - min(now, interval)))
3619 static int ata_eh_schedule_probe(struct ata_device *dev)
3621 struct ata_eh_context *ehc = &dev->link->eh_context;
3622 struct ata_link *link = ata_dev_phys_link(dev);
3625 if (!(ehc->i.probe_mask & (1 << dev->devno)) ||
3626 (ehc->did_probe_mask & (1 << dev->devno)))
3629 ata_eh_detach_dev(dev);
3631 ehc->did_probe_mask |= (1 << dev->devno);
3632 ehc->i.action |= ATA_EH_RESET;
3633 ehc->saved_xfer_mode[dev->devno] = 0;
3634 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
3636 /* the link maybe in a deep sleep, wake it up */
3637 if (link->lpm_policy > ATA_LPM_MAX_POWER) {
3638 if (ata_is_host_link(link))
3639 link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER,
3642 sata_pmp_set_lpm(link, ATA_LPM_MAX_POWER,
3646 /* Record and count probe trials on the ering. The specific
3647 * error mask used is irrelevant. Because a successful device
3648 * detection clears the ering, this count accumulates only if
3649 * there are consecutive failed probes.
3651 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3652 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3653 * forced to 1.5Gbps.
3655 * This is to work around cases where failed link speed
3656 * negotiation results in device misdetection leading to
3657 * infinite DEVXCHG or PHRDY CHG events.
3659 ata_ering_record(&dev->ering, 0, AC_ERR_OTHER);
3660 ata_ering_map(&dev->ering, ata_count_probe_trials_cb, &trials);
3662 if (trials > ATA_EH_PROBE_TRIALS)
3663 sata_down_spd_limit(link, 1);
3668 static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
3670 struct ata_eh_context *ehc = &dev->link->eh_context;
3672 /* -EAGAIN from EH routine indicates retry without prejudice.
3673 * The requester is responsible for ensuring forward progress.
3676 ehc->tries[dev->devno]--;
3680 /* device missing or wrong IDENTIFY data, schedule probing */
3681 ehc->i.probe_mask |= (1 << dev->devno);
3683 /* give it just one more chance */
3684 ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
3686 if (ehc->tries[dev->devno] == 1) {
3687 /* This is the last chance, better to slow
3688 * down than lose it.
3690 sata_down_spd_limit(ata_dev_phys_link(dev), 0);
3691 if (dev->pio_mode > XFER_PIO_0)
3692 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
3696 if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
3697 /* disable device if it has used up all its chances */
3698 ata_dev_disable(dev);
3700 /* detach if offline */
3701 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
3702 ata_eh_detach_dev(dev);
3704 /* schedule probe if necessary */
3705 if (ata_eh_schedule_probe(dev)) {
3706 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
3707 memset(ehc->cmd_timeout_idx[dev->devno], 0,
3708 sizeof(ehc->cmd_timeout_idx[dev->devno]));
3713 ehc->i.action |= ATA_EH_RESET;
3719 * ata_eh_recover - recover host port after error
3720 * @ap: host port to recover
3721 * @prereset: prereset method (can be NULL)
3722 * @softreset: softreset method (can be NULL)
3723 * @hardreset: hardreset method (can be NULL)
3724 * @postreset: postreset method (can be NULL)
3725 * @r_failed_link: out parameter for failed link
3727 * This is the alpha and omega, eum and yang, heart and soul of
3728 * libata exception handling. On entry, actions required to
3729 * recover each link and hotplug requests are recorded in the
3730 * link's eh_context. This function executes all the operations
3731 * with appropriate retrials and fallbacks to resurrect failed
3732 * devices, detach goners and greet newcomers.
3735 * Kernel thread context (may sleep).
3738 * 0 on success, -errno on failure.
3740 int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
3741 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3742 ata_postreset_fn_t postreset,
3743 struct ata_link **r_failed_link)
3745 struct ata_link *link;
3746 struct ata_device *dev;
3748 unsigned long flags, deadline;
3752 /* prep for recovery */
3753 ata_for_each_link(link, ap, EDGE) {
3754 struct ata_eh_context *ehc = &link->eh_context;
3756 /* re-enable link? */
3757 if (ehc->i.action & ATA_EH_ENABLE_LINK) {
3758 ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK);
3759 spin_lock_irqsave(ap->lock, flags);
3760 link->flags &= ~ATA_LFLAG_DISABLED;
3761 spin_unlock_irqrestore(ap->lock, flags);
3762 ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK);
3765 ata_for_each_dev(dev, link, ALL) {
3766 if (link->flags & ATA_LFLAG_NO_RETRY)
3767 ehc->tries[dev->devno] = 1;
3769 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
3771 /* collect port action mask recorded in dev actions */
3772 ehc->i.action |= ehc->i.dev_action[dev->devno] &
3773 ~ATA_EH_PERDEV_MASK;
3774 ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK;
3776 /* process hotplug request */
3777 if (dev->flags & ATA_DFLAG_DETACH)
3778 ata_eh_detach_dev(dev);
3780 /* schedule probe if necessary */
3781 if (!ata_dev_enabled(dev))
3782 ata_eh_schedule_probe(dev);
3789 /* if UNLOADING, finish immediately */
3790 if (ap->pflags & ATA_PFLAG_UNLOADING)
3794 ata_for_each_link(link, ap, EDGE) {
3795 struct ata_eh_context *ehc = &link->eh_context;
3797 /* skip EH if possible. */
3798 if (ata_eh_skip_recovery(link))
3801 ata_for_each_dev(dev, link, ALL)
3802 ehc->classes[dev->devno] = ATA_DEV_UNKNOWN;
3806 ata_for_each_link(link, ap, EDGE) {
3807 struct ata_eh_context *ehc = &link->eh_context;
3809 if (!(ehc->i.action & ATA_EH_RESET))
3812 rc = ata_eh_reset(link, ata_link_nr_vacant(link),
3813 prereset, softreset, hardreset, postreset);
3815 ata_link_err(link, "reset failed, giving up\n");
3824 * clears ATA_EH_PARK in eh_info and resets
3825 * ap->park_req_pending
3827 ata_eh_pull_park_action(ap);
3830 ata_for_each_link(link, ap, EDGE) {
3831 ata_for_each_dev(dev, link, ALL) {
3832 struct ata_eh_context *ehc = &link->eh_context;
3835 if (dev->class != ATA_DEV_ATA &&
3836 dev->class != ATA_DEV_ZAC)
3838 if (!(ehc->i.dev_action[dev->devno] &
3841 tmp = dev->unpark_deadline;
3842 if (time_before(deadline, tmp))
3844 else if (time_before_eq(tmp, jiffies))
3846 if (ehc->unloaded_mask & (1 << dev->devno))
3849 ata_eh_park_issue_cmd(dev, 1);
3854 if (time_before_eq(deadline, now))
3858 deadline = wait_for_completion_timeout(&ap->park_req_pending,
3862 ata_for_each_link(link, ap, EDGE) {
3863 ata_for_each_dev(dev, link, ALL) {
3864 if (!(link->eh_context.unloaded_mask &
3868 ata_eh_park_issue_cmd(dev, 0);
3869 ata_eh_done(link, dev, ATA_EH_PARK);
3875 ata_for_each_link(link, ap, PMP_FIRST) {
3876 struct ata_eh_context *ehc = &link->eh_context;
3878 if (sata_pmp_attached(ap) && ata_is_host_link(link))
3881 /* revalidate existing devices and attach new ones */
3882 rc = ata_eh_revalidate_and_attach(link, &dev);
3886 /* if PMP got attached, return, pmp EH will take care of it */
3887 if (link->device->class == ATA_DEV_PMP) {
3892 /* configure transfer mode if necessary */
3893 if (ehc->i.flags & ATA_EHI_SETMODE) {
3894 rc = ata_set_mode(link, &dev);
3897 ehc->i.flags &= ~ATA_EHI_SETMODE;
3900 /* If reset has been issued, clear UA to avoid
3901 * disrupting the current users of the device.
3903 if (ehc->i.flags & ATA_EHI_DID_RESET) {
3904 ata_for_each_dev(dev, link, ALL) {
3905 if (dev->class != ATA_DEV_ATAPI)
3907 rc = atapi_eh_clear_ua(dev);
3910 if (zpodd_dev_enabled(dev))
3911 zpodd_post_poweron(dev);
3915 /* retry flush if necessary */
3916 ata_for_each_dev(dev, link, ALL) {
3917 if (dev->class != ATA_DEV_ATA &&
3918 dev->class != ATA_DEV_ZAC)
3920 rc = ata_eh_maybe_retry_flush(dev);
3926 /* configure link power saving */
3927 if (link->lpm_policy != ap->target_lpm_policy) {
3928 rc = ata_eh_set_lpm(link, ap->target_lpm_policy, &dev);
3933 /* this link is okay now */
3940 ata_eh_handle_dev_fail(dev, rc);
3942 if (ap->pflags & ATA_PFLAG_FROZEN) {
3943 /* PMP reset requires working host port.
3944 * Can't retry if it's frozen.
3946 if (sata_pmp_attached(ap))
3956 if (rc && r_failed_link)
3957 *r_failed_link = link;
3959 DPRINTK("EXIT, rc=%d\n", rc);
3964 * ata_eh_finish - finish up EH
3965 * @ap: host port to finish EH for
3967 * Recovery is complete. Clean up EH states and retry or finish
3973 void ata_eh_finish(struct ata_port *ap)
3977 /* retry or finish qcs */
3978 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
3979 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
3981 if (!(qc->flags & ATA_QCFLAG_FAILED))
3985 /* FIXME: Once EH migration is complete,
3986 * generate sense data in this function,
3987 * considering both err_mask and tf.
3989 if (qc->flags & ATA_QCFLAG_RETRY)
3990 ata_eh_qc_retry(qc);
3992 ata_eh_qc_complete(qc);
3994 if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
3995 ata_eh_qc_complete(qc);
3997 /* feed zero TF to sense generation */
3998 memset(&qc->result_tf, 0, sizeof(qc->result_tf));
3999 ata_eh_qc_retry(qc);
4004 /* make sure nr_active_links is zero after EH */
4005 WARN_ON(ap->nr_active_links);
4006 ap->nr_active_links = 0;
4010 * ata_do_eh - do standard error handling
4011 * @ap: host port to handle error for
4013 * @prereset: prereset method (can be NULL)
4014 * @softreset: softreset method (can be NULL)
4015 * @hardreset: hardreset method (can be NULL)
4016 * @postreset: postreset method (can be NULL)
4018 * Perform standard error handling sequence.
4021 * Kernel thread context (may sleep).
4023 void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
4024 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
4025 ata_postreset_fn_t postreset)
4027 struct ata_device *dev;
4033 rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset,
4036 ata_for_each_dev(dev, &ap->link, ALL)
4037 ata_dev_disable(dev);
4044 * ata_std_error_handler - standard error handler
4045 * @ap: host port to handle error for
4047 * Standard error handler
4050 * Kernel thread context (may sleep).
4052 void ata_std_error_handler(struct ata_port *ap)
4054 struct ata_port_operations *ops = ap->ops;
4055 ata_reset_fn_t hardreset = ops->hardreset;
4057 /* ignore built-in hardreset if SCR access is not available */
4058 if (hardreset == sata_std_hardreset && !sata_scr_valid(&ap->link))
4061 ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
4066 * ata_eh_handle_port_suspend - perform port suspend operation
4067 * @ap: port to suspend
4072 * Kernel thread context (may sleep).
4074 static void ata_eh_handle_port_suspend(struct ata_port *ap)
4076 unsigned long flags;
4078 struct ata_device *dev;
4080 /* are we suspending? */
4081 spin_lock_irqsave(ap->lock, flags);
4082 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
4083 ap->pm_mesg.event & PM_EVENT_RESUME) {
4084 spin_unlock_irqrestore(ap->lock, flags);
4087 spin_unlock_irqrestore(ap->lock, flags);
4089 WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
4092 * If we have a ZPODD attached, check its zero
4093 * power ready status before the port is frozen.
4094 * Only needed for runtime suspend.
4096 if (PMSG_IS_AUTO(ap->pm_mesg)) {
4097 ata_for_each_dev(dev, &ap->link, ENABLED) {
4098 if (zpodd_dev_enabled(dev))
4099 zpodd_on_suspend(dev);
4103 /* tell ACPI we're suspending */
4104 rc = ata_acpi_on_suspend(ap);
4109 ata_eh_freeze_port(ap);
4111 if (ap->ops->port_suspend)
4112 rc = ap->ops->port_suspend(ap, ap->pm_mesg);
4114 ata_acpi_set_state(ap, ap->pm_mesg);
4116 /* update the flags */
4117 spin_lock_irqsave(ap->lock, flags);
4119 ap->pflags &= ~ATA_PFLAG_PM_PENDING;
4121 ap->pflags |= ATA_PFLAG_SUSPENDED;
4122 else if (ap->pflags & ATA_PFLAG_FROZEN)
4123 ata_port_schedule_eh(ap);
4125 spin_unlock_irqrestore(ap->lock, flags);
4131 * ata_eh_handle_port_resume - perform port resume operation
4132 * @ap: port to resume
4137 * Kernel thread context (may sleep).
4139 static void ata_eh_handle_port_resume(struct ata_port *ap)
4141 struct ata_link *link;
4142 struct ata_device *dev;
4143 unsigned long flags;
4146 /* are we resuming? */
4147 spin_lock_irqsave(ap->lock, flags);
4148 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
4149 !(ap->pm_mesg.event & PM_EVENT_RESUME)) {
4150 spin_unlock_irqrestore(ap->lock, flags);
4153 spin_unlock_irqrestore(ap->lock, flags);
4155 WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
4158 * Error timestamps are in jiffies which doesn't run while
4159 * suspended and PHY events during resume isn't too uncommon.
4160 * When the two are combined, it can lead to unnecessary speed
4161 * downs if the machine is suspended and resumed repeatedly.
4162 * Clear error history.
4164 ata_for_each_link(link, ap, HOST_FIRST)
4165 ata_for_each_dev(dev, link, ALL)
4166 ata_ering_clear(&dev->ering);
4168 ata_acpi_set_state(ap, ap->pm_mesg);
4170 if (ap->ops->port_resume)
4171 rc = ap->ops->port_resume(ap);
4173 /* tell ACPI that we're resuming */
4174 ata_acpi_on_resume(ap);
4176 /* update the flags */
4177 spin_lock_irqsave(ap->lock, flags);
4178 ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
4179 spin_unlock_irqrestore(ap->lock, flags);
4181 #endif /* CONFIG_PM */