2 * libata-eh.c - libata error handling
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2006 Tejun Heo <htejun@gmail.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
35 #include <linux/kernel.h>
36 #include <linux/blkdev.h>
37 #include <linux/pci.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_host.h>
40 #include <scsi/scsi_eh.h>
41 #include <scsi/scsi_device.h>
42 #include <scsi/scsi_cmnd.h>
43 #include <scsi/scsi_dbg.h>
44 #include "../scsi/scsi_transport_api.h"
46 #include <linux/libata.h>
51 /* speed down verdicts */
52 ATA_EH_SPDN_NCQ_OFF = (1 << 0),
53 ATA_EH_SPDN_SPEED_DOWN = (1 << 1),
54 ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2),
55 ATA_EH_SPDN_KEEP_ERRORS = (1 << 3),
58 ATA_EFLAG_IS_IO = (1 << 0),
59 ATA_EFLAG_DUBIOUS_XFER = (1 << 1),
60 ATA_EFLAG_OLD_ER = (1 << 31),
62 /* error categories */
65 ATA_ECAT_TOUT_HSM = 2,
67 ATA_ECAT_DUBIOUS_NONE = 4,
68 ATA_ECAT_DUBIOUS_ATA_BUS = 5,
69 ATA_ECAT_DUBIOUS_TOUT_HSM = 6,
70 ATA_ECAT_DUBIOUS_UNK_DEV = 7,
73 ATA_EH_CMD_DFL_TIMEOUT = 5000,
75 /* always put at least this amount of time between resets */
76 ATA_EH_RESET_COOL_DOWN = 5000,
78 /* Waiting in ->prereset can never be reliable. It's
79 * sometimes nice to wait there but it can't be depended upon;
80 * otherwise, we wouldn't be resetting. Just give it enough
81 * time for most drives to spin up.
83 ATA_EH_PRERESET_TIMEOUT = 10000,
84 ATA_EH_FASTDRAIN_INTERVAL = 3000,
88 /* probe speed down parameters, see ata_eh_schedule_probe() */
89 ATA_EH_PROBE_TRIAL_INTERVAL = 60000, /* 1 min */
90 ATA_EH_PROBE_TRIALS = 2,
93 /* The following table determines how we sequence resets. Each entry
94 * represents timeout for that try. The first try can be soft or
95 * hardreset. All others are hardreset if available. In most cases
96 * the first reset w/ 10sec timeout should succeed. Following entries
97 * are mostly for error handling, hotplug and retarded devices.
99 static const unsigned long ata_eh_reset_timeouts[] = {
100 10000, /* most drives spin up by 10sec */
101 10000, /* > 99% working drives spin up before 20sec */
102 35000, /* give > 30 secs of idleness for retarded devices */
103 5000, /* and sweet one last chance */
104 ULONG_MAX, /* > 1 min has elapsed, give up */
107 static const unsigned long ata_eh_identify_timeouts[] = {
108 5000, /* covers > 99% of successes and not too boring on failures */
109 10000, /* combined time till here is enough even for media access */
110 30000, /* for true idiots */
114 static const unsigned long ata_eh_flush_timeouts[] = {
115 15000, /* be generous with flush */
117 30000, /* and even more generous */
121 static const unsigned long ata_eh_other_timeouts[] = {
122 5000, /* same rationale as identify timeout */
124 /* but no merciful 30sec for other commands, it just isn't worth it */
128 struct ata_eh_cmd_timeout_ent {
130 const unsigned long *timeouts;
133 /* The following table determines timeouts to use for EH internal
134 * commands. Each table entry is a command class and matches the
135 * commands the entry applies to and the timeout table to use.
137 * On the retry after a command timed out, the next timeout value from
138 * the table is used. If the table doesn't contain further entries,
139 * the last value is used.
141 * ehc->cmd_timeout_idx keeps track of which timeout to use per
142 * command class, so if SET_FEATURES times out on the first try, the
143 * next try will use the second timeout value only for that class.
145 #define CMDS(cmds...) (const u8 []){ cmds, 0 }
146 static const struct ata_eh_cmd_timeout_ent
147 ata_eh_cmd_timeout_table[ATA_EH_CMD_TIMEOUT_TABLE_SIZE] = {
148 { .commands = CMDS(ATA_CMD_ID_ATA, ATA_CMD_ID_ATAPI),
149 .timeouts = ata_eh_identify_timeouts, },
150 { .commands = CMDS(ATA_CMD_READ_NATIVE_MAX, ATA_CMD_READ_NATIVE_MAX_EXT),
151 .timeouts = ata_eh_other_timeouts, },
152 { .commands = CMDS(ATA_CMD_SET_MAX, ATA_CMD_SET_MAX_EXT),
153 .timeouts = ata_eh_other_timeouts, },
154 { .commands = CMDS(ATA_CMD_SET_FEATURES),
155 .timeouts = ata_eh_other_timeouts, },
156 { .commands = CMDS(ATA_CMD_INIT_DEV_PARAMS),
157 .timeouts = ata_eh_other_timeouts, },
158 { .commands = CMDS(ATA_CMD_FLUSH, ATA_CMD_FLUSH_EXT),
159 .timeouts = ata_eh_flush_timeouts },
163 static void __ata_port_freeze(struct ata_port *ap);
165 static void ata_eh_handle_port_suspend(struct ata_port *ap);
166 static void ata_eh_handle_port_resume(struct ata_port *ap);
167 #else /* CONFIG_PM */
168 static void ata_eh_handle_port_suspend(struct ata_port *ap)
171 static void ata_eh_handle_port_resume(struct ata_port *ap)
173 #endif /* CONFIG_PM */
175 static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt,
178 ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len,
179 ATA_EH_DESC_LEN - ehi->desc_len,
184 * __ata_ehi_push_desc - push error description without adding separator
186 * @fmt: printf format string
188 * Format string according to @fmt and append it to @ehi->desc.
191 * spin_lock_irqsave(host lock)
193 void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
198 __ata_ehi_pushv_desc(ehi, fmt, args);
203 * ata_ehi_push_desc - push error description with separator
205 * @fmt: printf format string
207 * Format string according to @fmt and append it to @ehi->desc.
208 * If @ehi->desc is not empty, ", " is added in-between.
211 * spin_lock_irqsave(host lock)
213 void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
218 __ata_ehi_push_desc(ehi, ", ");
221 __ata_ehi_pushv_desc(ehi, fmt, args);
226 * ata_ehi_clear_desc - clean error description
232 * spin_lock_irqsave(host lock)
234 void ata_ehi_clear_desc(struct ata_eh_info *ehi)
241 * ata_port_desc - append port description
242 * @ap: target ATA port
243 * @fmt: printf format string
245 * Format string according to @fmt and append it to port
246 * description. If port description is not empty, " " is added
247 * in-between. This function is to be used while initializing
248 * ata_host. The description is printed on host registration.
253 void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
257 WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING));
259 if (ap->link.eh_info.desc_len)
260 __ata_ehi_push_desc(&ap->link.eh_info, " ");
263 __ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
270 * ata_port_pbar_desc - append PCI BAR description
271 * @ap: target ATA port
272 * @bar: target PCI BAR
273 * @offset: offset into PCI BAR
274 * @name: name of the area
276 * If @offset is negative, this function formats a string which
277 * contains the name, address, size and type of the BAR and
278 * appends it to the port description. If @offset is zero or
279 * positive, only name and offsetted address is appended.
284 void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
287 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
289 unsigned long long start, len;
291 if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
293 else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
296 start = (unsigned long long)pci_resource_start(pdev, bar);
297 len = (unsigned long long)pci_resource_len(pdev, bar);
300 ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start);
302 ata_port_desc(ap, "%s 0x%llx", name,
303 start + (unsigned long long)offset);
306 #endif /* CONFIG_PCI */
308 static int ata_lookup_timeout_table(u8 cmd)
312 for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
315 for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
324 * ata_internal_cmd_timeout - determine timeout for an internal command
325 * @dev: target device
326 * @cmd: internal command to be issued
328 * Determine timeout for internal command @cmd for @dev.
334 * Determined timeout.
336 unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd)
338 struct ata_eh_context *ehc = &dev->link->eh_context;
339 int ent = ata_lookup_timeout_table(cmd);
343 return ATA_EH_CMD_DFL_TIMEOUT;
345 idx = ehc->cmd_timeout_idx[dev->devno][ent];
346 return ata_eh_cmd_timeout_table[ent].timeouts[idx];
350 * ata_internal_cmd_timed_out - notification for internal command timeout
351 * @dev: target device
352 * @cmd: internal command which timed out
354 * Notify EH that internal command @cmd for @dev timed out. This
355 * function should be called only for commands whose timeouts are
356 * determined using ata_internal_cmd_timeout().
361 void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd)
363 struct ata_eh_context *ehc = &dev->link->eh_context;
364 int ent = ata_lookup_timeout_table(cmd);
370 idx = ehc->cmd_timeout_idx[dev->devno][ent];
371 if (ata_eh_cmd_timeout_table[ent].timeouts[idx + 1] != ULONG_MAX)
372 ehc->cmd_timeout_idx[dev->devno][ent]++;
375 static void ata_ering_record(struct ata_ering *ering, unsigned int eflags,
376 unsigned int err_mask)
378 struct ata_ering_entry *ent;
383 ering->cursor %= ATA_ERING_SIZE;
385 ent = &ering->ring[ering->cursor];
386 ent->eflags = eflags;
387 ent->err_mask = err_mask;
388 ent->timestamp = get_jiffies_64();
391 static struct ata_ering_entry *ata_ering_top(struct ata_ering *ering)
393 struct ata_ering_entry *ent = &ering->ring[ering->cursor];
400 int ata_ering_map(struct ata_ering *ering,
401 int (*map_fn)(struct ata_ering_entry *, void *),
405 struct ata_ering_entry *ent;
409 ent = &ering->ring[idx];
412 rc = map_fn(ent, arg);
415 idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
416 } while (idx != ering->cursor);
421 int ata_ering_clear_cb(struct ata_ering_entry *ent, void *void_arg)
423 ent->eflags |= ATA_EFLAG_OLD_ER;
427 static void ata_ering_clear(struct ata_ering *ering)
429 ata_ering_map(ering, ata_ering_clear_cb, NULL);
432 static unsigned int ata_eh_dev_action(struct ata_device *dev)
434 struct ata_eh_context *ehc = &dev->link->eh_context;
436 return ehc->i.action | ehc->i.dev_action[dev->devno];
439 static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
440 struct ata_eh_info *ehi, unsigned int action)
442 struct ata_device *tdev;
445 ehi->action &= ~action;
446 ata_for_each_dev(tdev, link, ALL)
447 ehi->dev_action[tdev->devno] &= ~action;
449 /* doesn't make sense for port-wide EH actions */
450 WARN_ON(!(action & ATA_EH_PERDEV_MASK));
452 /* break ehi->action into ehi->dev_action */
453 if (ehi->action & action) {
454 ata_for_each_dev(tdev, link, ALL)
455 ehi->dev_action[tdev->devno] |=
456 ehi->action & action;
457 ehi->action &= ~action;
460 /* turn off the specified per-dev action */
461 ehi->dev_action[dev->devno] &= ~action;
466 * ata_scsi_timed_out - SCSI layer time out callback
467 * @cmd: timed out SCSI command
469 * Handles SCSI layer timeout. We race with normal completion of
470 * the qc for @cmd. If the qc is already gone, we lose and let
471 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
472 * timed out and EH should be invoked. Prevent ata_qc_complete()
473 * from finishing it by setting EH_SCHEDULED and return
476 * TODO: kill this function once old EH is gone.
479 * Called from timer context
482 * EH_HANDLED or EH_NOT_HANDLED
484 enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
486 struct Scsi_Host *host = cmd->device->host;
487 struct ata_port *ap = ata_shost_to_port(host);
489 struct ata_queued_cmd *qc;
490 enum blk_eh_timer_return ret;
494 if (ap->ops->error_handler) {
495 ret = BLK_EH_NOT_HANDLED;
499 ret = BLK_EH_HANDLED;
500 spin_lock_irqsave(ap->lock, flags);
501 qc = ata_qc_from_tag(ap, ap->link.active_tag);
503 WARN_ON(qc->scsicmd != cmd);
504 qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
505 qc->err_mask |= AC_ERR_TIMEOUT;
506 ret = BLK_EH_NOT_HANDLED;
508 spin_unlock_irqrestore(ap->lock, flags);
511 DPRINTK("EXIT, ret=%d\n", ret);
515 static void ata_eh_unload(struct ata_port *ap)
517 struct ata_link *link;
518 struct ata_device *dev;
521 /* Restore SControl IPM and SPD for the next driver and
522 * disable attached devices.
524 ata_for_each_link(link, ap, PMP_FIRST) {
525 sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
526 ata_for_each_dev(dev, link, ALL)
527 ata_dev_disable(dev);
530 /* freeze and set UNLOADED */
531 spin_lock_irqsave(ap->lock, flags);
533 ata_port_freeze(ap); /* won't be thawed */
534 ap->pflags &= ~ATA_PFLAG_EH_PENDING; /* clear pending from freeze */
535 ap->pflags |= ATA_PFLAG_UNLOADED;
537 spin_unlock_irqrestore(ap->lock, flags);
541 * ata_scsi_error - SCSI layer error handler callback
542 * @host: SCSI host on which error occurred
544 * Handles SCSI-layer-thrown error events.
547 * Inherited from SCSI layer (none, can sleep)
552 void ata_scsi_error(struct Scsi_Host *host)
554 struct ata_port *ap = ata_shost_to_port(host);
560 /* make sure sff pio task is not running */
561 ata_sff_flush_pio_task(ap);
563 /* synchronize with host lock and sort out timeouts */
565 /* For new EH, all qcs are finished in one of three ways -
566 * normal completion, error completion, and SCSI timeout.
567 * Both completions can race against SCSI timeout. When normal
568 * completion wins, the qc never reaches EH. When error
569 * completion wins, the qc has ATA_QCFLAG_FAILED set.
571 * When SCSI timeout wins, things are a bit more complex.
572 * Normal or error completion can occur after the timeout but
573 * before this point. In such cases, both types of
574 * completions are honored. A scmd is determined to have
575 * timed out iff its associated qc is active and not failed.
577 if (ap->ops->error_handler) {
578 struct scsi_cmnd *scmd, *tmp;
581 spin_lock_irqsave(ap->lock, flags);
583 /* This must occur under the ap->lock as we don't want
584 a polled recovery to race the real interrupt handler
586 The lost_interrupt handler checks for any completed but
587 non-notified command and completes much like an IRQ handler.
589 We then fall into the error recovery code which will treat
590 this as if normal completion won the race */
592 if (ap->ops->lost_interrupt)
593 ap->ops->lost_interrupt(ap);
595 list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
596 struct ata_queued_cmd *qc;
598 for (i = 0; i < ATA_MAX_QUEUE; i++) {
599 qc = __ata_qc_from_tag(ap, i);
600 if (qc->flags & ATA_QCFLAG_ACTIVE &&
605 if (i < ATA_MAX_QUEUE) {
606 /* the scmd has an associated qc */
607 if (!(qc->flags & ATA_QCFLAG_FAILED)) {
608 /* which hasn't failed yet, timeout */
609 qc->err_mask |= AC_ERR_TIMEOUT;
610 qc->flags |= ATA_QCFLAG_FAILED;
614 /* Normal completion occurred after
615 * SCSI timeout but before this point.
616 * Successfully complete it.
618 scmd->retries = scmd->allowed;
619 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
623 /* If we have timed out qcs. They belong to EH from
624 * this point but the state of the controller is
625 * unknown. Freeze the port to make sure the IRQ
626 * handler doesn't diddle with those qcs. This must
627 * be done atomically w.r.t. setting QCFLAG_FAILED.
630 __ata_port_freeze(ap);
632 spin_unlock_irqrestore(ap->lock, flags);
634 /* initialize eh_tries */
635 ap->eh_tries = ATA_EH_MAX_TRIES;
637 spin_unlock_wait(ap->lock);
639 /* If we timed raced normal completion and there is nothing to
640 recover nr_timedout == 0 why exactly are we doing error recovery ? */
643 /* invoke error handler */
644 if (ap->ops->error_handler) {
645 struct ata_link *link;
647 /* kill fast drain timer */
648 del_timer_sync(&ap->fastdrain_timer);
650 /* process port resume request */
651 ata_eh_handle_port_resume(ap);
653 /* fetch & clear EH info */
654 spin_lock_irqsave(ap->lock, flags);
656 ata_for_each_link(link, ap, HOST_FIRST) {
657 struct ata_eh_context *ehc = &link->eh_context;
658 struct ata_device *dev;
660 memset(&link->eh_context, 0, sizeof(link->eh_context));
661 link->eh_context.i = link->eh_info;
662 memset(&link->eh_info, 0, sizeof(link->eh_info));
664 ata_for_each_dev(dev, link, ENABLED) {
665 int devno = dev->devno;
667 ehc->saved_xfer_mode[devno] = dev->xfer_mode;
668 if (ata_ncq_enabled(dev))
669 ehc->saved_ncq_enabled |= 1 << devno;
673 ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
674 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
675 ap->excl_link = NULL; /* don't maintain exclusion over EH */
677 spin_unlock_irqrestore(ap->lock, flags);
679 /* invoke EH, skip if unloading or suspended */
680 if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
681 ap->ops->error_handler(ap);
683 /* if unloading, commence suicide */
684 if ((ap->pflags & ATA_PFLAG_UNLOADING) &&
685 !(ap->pflags & ATA_PFLAG_UNLOADED))
690 /* process port suspend request */
691 ata_eh_handle_port_suspend(ap);
693 /* Exception might have happend after ->error_handler
694 * recovered the port but before this point. Repeat
697 spin_lock_irqsave(ap->lock, flags);
699 if (ap->pflags & ATA_PFLAG_EH_PENDING) {
700 if (--ap->eh_tries) {
701 spin_unlock_irqrestore(ap->lock, flags);
704 ata_port_printk(ap, KERN_ERR, "EH pending after %d "
705 "tries, giving up\n", ATA_EH_MAX_TRIES);
706 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
709 /* this run is complete, make sure EH info is clear */
710 ata_for_each_link(link, ap, HOST_FIRST)
711 memset(&link->eh_info, 0, sizeof(link->eh_info));
713 /* Clear host_eh_scheduled while holding ap->lock such
714 * that if exception occurs after this point but
715 * before EH completion, SCSI midlayer will
718 host->host_eh_scheduled = 0;
720 spin_unlock_irqrestore(ap->lock, flags);
722 WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
723 ap->ops->eng_timeout(ap);
726 /* finish or retry handled scmd's and clean up */
727 WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
729 scsi_eh_flush_done_q(&ap->eh_done_q);
732 spin_lock_irqsave(ap->lock, flags);
734 if (ap->pflags & ATA_PFLAG_LOADING)
735 ap->pflags &= ~ATA_PFLAG_LOADING;
736 else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
737 schedule_delayed_work(&ap->hotplug_task, 0);
739 if (ap->pflags & ATA_PFLAG_RECOVERED)
740 ata_port_printk(ap, KERN_INFO, "EH complete\n");
742 ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
744 /* tell wait_eh that we're done */
745 ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
746 wake_up_all(&ap->eh_wait_q);
748 spin_unlock_irqrestore(ap->lock, flags);
754 * ata_port_wait_eh - Wait for the currently pending EH to complete
755 * @ap: Port to wait EH for
757 * Wait until the currently pending EH is complete.
760 * Kernel thread context (may sleep).
762 void ata_port_wait_eh(struct ata_port *ap)
768 spin_lock_irqsave(ap->lock, flags);
770 while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
771 prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
772 spin_unlock_irqrestore(ap->lock, flags);
774 spin_lock_irqsave(ap->lock, flags);
776 finish_wait(&ap->eh_wait_q, &wait);
778 spin_unlock_irqrestore(ap->lock, flags);
780 /* make sure SCSI EH is complete */
781 if (scsi_host_in_recovery(ap->scsi_host)) {
787 static int ata_eh_nr_in_flight(struct ata_port *ap)
792 /* count only non-internal commands */
793 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++)
794 if (ata_qc_from_tag(ap, tag))
800 void ata_eh_fastdrain_timerfn(unsigned long arg)
802 struct ata_port *ap = (void *)arg;
806 spin_lock_irqsave(ap->lock, flags);
808 cnt = ata_eh_nr_in_flight(ap);
814 if (cnt == ap->fastdrain_cnt) {
817 /* No progress during the last interval, tag all
818 * in-flight qcs as timed out and freeze the port.
820 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) {
821 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
823 qc->err_mask |= AC_ERR_TIMEOUT;
828 /* some qcs have finished, give it another chance */
829 ap->fastdrain_cnt = cnt;
830 ap->fastdrain_timer.expires =
831 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
832 add_timer(&ap->fastdrain_timer);
836 spin_unlock_irqrestore(ap->lock, flags);
840 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
841 * @ap: target ATA port
842 * @fastdrain: activate fast drain
844 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
845 * is non-zero and EH wasn't pending before. Fast drain ensures
846 * that EH kicks in in timely manner.
849 * spin_lock_irqsave(host lock)
851 static void ata_eh_set_pending(struct ata_port *ap, int fastdrain)
855 /* already scheduled? */
856 if (ap->pflags & ATA_PFLAG_EH_PENDING)
859 ap->pflags |= ATA_PFLAG_EH_PENDING;
864 /* do we have in-flight qcs? */
865 cnt = ata_eh_nr_in_flight(ap);
869 /* activate fast drain */
870 ap->fastdrain_cnt = cnt;
871 ap->fastdrain_timer.expires =
872 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
873 add_timer(&ap->fastdrain_timer);
877 * ata_qc_schedule_eh - schedule qc for error handling
878 * @qc: command to schedule error handling for
880 * Schedule error handling for @qc. EH will kick in as soon as
881 * other commands are drained.
884 * spin_lock_irqsave(host lock)
886 void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
888 struct ata_port *ap = qc->ap;
889 struct request_queue *q = qc->scsicmd->device->request_queue;
892 WARN_ON(!ap->ops->error_handler);
894 qc->flags |= ATA_QCFLAG_FAILED;
895 ata_eh_set_pending(ap, 1);
897 /* The following will fail if timeout has already expired.
898 * ata_scsi_error() takes care of such scmds on EH entry.
899 * Note that ATA_QCFLAG_FAILED is unconditionally set after
900 * this function completes.
902 spin_lock_irqsave(q->queue_lock, flags);
903 blk_abort_request(qc->scsicmd->request);
904 spin_unlock_irqrestore(q->queue_lock, flags);
908 * ata_port_schedule_eh - schedule error handling without a qc
909 * @ap: ATA port to schedule EH for
911 * Schedule error handling for @ap. EH will kick in as soon as
912 * all commands are drained.
915 * spin_lock_irqsave(host lock)
917 void ata_port_schedule_eh(struct ata_port *ap)
919 WARN_ON(!ap->ops->error_handler);
921 if (ap->pflags & ATA_PFLAG_INITIALIZING)
924 ata_eh_set_pending(ap, 1);
925 scsi_schedule_eh(ap->scsi_host);
927 DPRINTK("port EH scheduled\n");
930 static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
932 int tag, nr_aborted = 0;
934 WARN_ON(!ap->ops->error_handler);
936 /* we're gonna abort all commands, no need for fast drain */
937 ata_eh_set_pending(ap, 0);
939 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
940 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
942 if (qc && (!link || qc->dev->link == link)) {
943 qc->flags |= ATA_QCFLAG_FAILED;
950 ata_port_schedule_eh(ap);
956 * ata_link_abort - abort all qc's on the link
957 * @link: ATA link to abort qc's for
959 * Abort all active qc's active on @link and schedule EH.
962 * spin_lock_irqsave(host lock)
965 * Number of aborted qc's.
967 int ata_link_abort(struct ata_link *link)
969 return ata_do_link_abort(link->ap, link);
973 * ata_port_abort - abort all qc's on the port
974 * @ap: ATA port to abort qc's for
976 * Abort all active qc's of @ap and schedule EH.
979 * spin_lock_irqsave(host_set lock)
982 * Number of aborted qc's.
984 int ata_port_abort(struct ata_port *ap)
986 return ata_do_link_abort(ap, NULL);
990 * __ata_port_freeze - freeze port
991 * @ap: ATA port to freeze
993 * This function is called when HSM violation or some other
994 * condition disrupts normal operation of the port. Frozen port
995 * is not allowed to perform any operation until the port is
996 * thawed, which usually follows a successful reset.
998 * ap->ops->freeze() callback can be used for freezing the port
999 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1000 * port cannot be frozen hardware-wise, the interrupt handler
1001 * must ack and clear interrupts unconditionally while the port
1005 * spin_lock_irqsave(host lock)
1007 static void __ata_port_freeze(struct ata_port *ap)
1009 WARN_ON(!ap->ops->error_handler);
1011 if (ap->ops->freeze)
1012 ap->ops->freeze(ap);
1014 ap->pflags |= ATA_PFLAG_FROZEN;
1016 DPRINTK("ata%u port frozen\n", ap->print_id);
1020 * ata_port_freeze - abort & freeze port
1021 * @ap: ATA port to freeze
1023 * Abort and freeze @ap. The freeze operation must be called
1024 * first, because some hardware requires special operations
1025 * before the taskfile registers are accessible.
1028 * spin_lock_irqsave(host lock)
1031 * Number of aborted commands.
1033 int ata_port_freeze(struct ata_port *ap)
1037 WARN_ON(!ap->ops->error_handler);
1039 __ata_port_freeze(ap);
1040 nr_aborted = ata_port_abort(ap);
1046 * sata_async_notification - SATA async notification handler
1047 * @ap: ATA port where async notification is received
1049 * Handler to be called when async notification via SDB FIS is
1050 * received. This function schedules EH if necessary.
1053 * spin_lock_irqsave(host lock)
1056 * 1 if EH is scheduled, 0 otherwise.
1058 int sata_async_notification(struct ata_port *ap)
1063 if (!(ap->flags & ATA_FLAG_AN))
1066 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1068 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1070 if (!sata_pmp_attached(ap) || rc) {
1071 /* PMP is not attached or SNTF is not available */
1072 if (!sata_pmp_attached(ap)) {
1073 /* PMP is not attached. Check whether ATAPI
1074 * AN is configured. If so, notify media
1077 struct ata_device *dev = ap->link.device;
1079 if ((dev->class == ATA_DEV_ATAPI) &&
1080 (dev->flags & ATA_DFLAG_AN))
1081 ata_scsi_media_change_notify(dev);
1084 /* PMP is attached but SNTF is not available.
1085 * ATAPI async media change notification is
1086 * not used. The PMP must be reporting PHY
1087 * status change, schedule EH.
1089 ata_port_schedule_eh(ap);
1093 /* PMP is attached and SNTF is available */
1094 struct ata_link *link;
1096 /* check and notify ATAPI AN */
1097 ata_for_each_link(link, ap, EDGE) {
1098 if (!(sntf & (1 << link->pmp)))
1101 if ((link->device->class == ATA_DEV_ATAPI) &&
1102 (link->device->flags & ATA_DFLAG_AN))
1103 ata_scsi_media_change_notify(link->device);
1106 /* If PMP is reporting that PHY status of some
1107 * downstream ports has changed, schedule EH.
1109 if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
1110 ata_port_schedule_eh(ap);
1119 * ata_eh_freeze_port - EH helper to freeze port
1120 * @ap: ATA port to freeze
1127 void ata_eh_freeze_port(struct ata_port *ap)
1129 unsigned long flags;
1131 if (!ap->ops->error_handler)
1134 spin_lock_irqsave(ap->lock, flags);
1135 __ata_port_freeze(ap);
1136 spin_unlock_irqrestore(ap->lock, flags);
1140 * ata_port_thaw_port - EH helper to thaw port
1141 * @ap: ATA port to thaw
1143 * Thaw frozen port @ap.
1148 void ata_eh_thaw_port(struct ata_port *ap)
1150 unsigned long flags;
1152 if (!ap->ops->error_handler)
1155 spin_lock_irqsave(ap->lock, flags);
1157 ap->pflags &= ~ATA_PFLAG_FROZEN;
1162 spin_unlock_irqrestore(ap->lock, flags);
1164 DPRINTK("ata%u port thawed\n", ap->print_id);
1167 static void ata_eh_scsidone(struct scsi_cmnd *scmd)
1172 static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
1174 struct ata_port *ap = qc->ap;
1175 struct scsi_cmnd *scmd = qc->scsicmd;
1176 unsigned long flags;
1178 spin_lock_irqsave(ap->lock, flags);
1179 qc->scsidone = ata_eh_scsidone;
1180 __ata_qc_complete(qc);
1181 WARN_ON(ata_tag_valid(qc->tag));
1182 spin_unlock_irqrestore(ap->lock, flags);
1184 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
1188 * ata_eh_qc_complete - Complete an active ATA command from EH
1189 * @qc: Command to complete
1191 * Indicate to the mid and upper layers that an ATA command has
1192 * completed. To be used from EH.
1194 void ata_eh_qc_complete(struct ata_queued_cmd *qc)
1196 struct scsi_cmnd *scmd = qc->scsicmd;
1197 scmd->retries = scmd->allowed;
1198 __ata_eh_qc_complete(qc);
1202 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1203 * @qc: Command to retry
1205 * Indicate to the mid and upper layers that an ATA command
1206 * should be retried. To be used from EH.
1208 * SCSI midlayer limits the number of retries to scmd->allowed.
1209 * scmd->retries is decremented for commands which get retried
1210 * due to unrelated failures (qc->err_mask is zero).
1212 void ata_eh_qc_retry(struct ata_queued_cmd *qc)
1214 struct scsi_cmnd *scmd = qc->scsicmd;
1215 if (!qc->err_mask && scmd->retries)
1217 __ata_eh_qc_complete(qc);
1221 * ata_dev_disable - disable ATA device
1222 * @dev: ATA device to disable
1229 void ata_dev_disable(struct ata_device *dev)
1231 if (!ata_dev_enabled(dev))
1234 if (ata_msg_drv(dev->link->ap))
1235 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
1236 ata_acpi_on_disable(dev);
1237 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
1240 /* From now till the next successful probe, ering is used to
1241 * track probe failures. Clear accumulated device error info.
1243 ata_ering_clear(&dev->ering);
1247 * ata_eh_detach_dev - detach ATA device
1248 * @dev: ATA device to detach
1255 void ata_eh_detach_dev(struct ata_device *dev)
1257 struct ata_link *link = dev->link;
1258 struct ata_port *ap = link->ap;
1259 struct ata_eh_context *ehc = &link->eh_context;
1260 unsigned long flags;
1262 ata_dev_disable(dev);
1264 spin_lock_irqsave(ap->lock, flags);
1266 dev->flags &= ~ATA_DFLAG_DETACH;
1268 if (ata_scsi_offline_dev(dev)) {
1269 dev->flags |= ATA_DFLAG_DETACHED;
1270 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
1273 /* clear per-dev EH info */
1274 ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK);
1275 ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK);
1276 ehc->saved_xfer_mode[dev->devno] = 0;
1277 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
1279 spin_unlock_irqrestore(ap->lock, flags);
1283 * ata_eh_about_to_do - about to perform eh_action
1284 * @link: target ATA link
1285 * @dev: target ATA dev for per-dev action (can be NULL)
1286 * @action: action about to be performed
1288 * Called just before performing EH actions to clear related bits
1289 * in @link->eh_info such that eh actions are not unnecessarily
1295 void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
1296 unsigned int action)
1298 struct ata_port *ap = link->ap;
1299 struct ata_eh_info *ehi = &link->eh_info;
1300 struct ata_eh_context *ehc = &link->eh_context;
1301 unsigned long flags;
1303 spin_lock_irqsave(ap->lock, flags);
1305 ata_eh_clear_action(link, dev, ehi, action);
1307 /* About to take EH action, set RECOVERED. Ignore actions on
1308 * slave links as master will do them again.
1310 if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link)
1311 ap->pflags |= ATA_PFLAG_RECOVERED;
1313 spin_unlock_irqrestore(ap->lock, flags);
1317 * ata_eh_done - EH action complete
1318 * @ap: target ATA port
1319 * @dev: target ATA dev for per-dev action (can be NULL)
1320 * @action: action just completed
1322 * Called right after performing EH actions to clear related bits
1323 * in @link->eh_context.
1328 void ata_eh_done(struct ata_link *link, struct ata_device *dev,
1329 unsigned int action)
1331 struct ata_eh_context *ehc = &link->eh_context;
1333 ata_eh_clear_action(link, dev, &ehc->i, action);
1337 * ata_err_string - convert err_mask to descriptive string
1338 * @err_mask: error mask to convert to string
1340 * Convert @err_mask to descriptive string. Errors are
1341 * prioritized according to severity and only the most severe
1342 * error is reported.
1348 * Descriptive string for @err_mask
1350 static const char *ata_err_string(unsigned int err_mask)
1352 if (err_mask & AC_ERR_HOST_BUS)
1353 return "host bus error";
1354 if (err_mask & AC_ERR_ATA_BUS)
1355 return "ATA bus error";
1356 if (err_mask & AC_ERR_TIMEOUT)
1358 if (err_mask & AC_ERR_HSM)
1359 return "HSM violation";
1360 if (err_mask & AC_ERR_SYSTEM)
1361 return "internal error";
1362 if (err_mask & AC_ERR_MEDIA)
1363 return "media error";
1364 if (err_mask & AC_ERR_INVALID)
1365 return "invalid argument";
1366 if (err_mask & AC_ERR_DEV)
1367 return "device error";
1368 return "unknown error";
1372 * ata_read_log_page - read a specific log page
1373 * @dev: target device
1374 * @page: page to read
1375 * @buf: buffer to store read page
1376 * @sectors: number of sectors to read
1378 * Read log page using READ_LOG_EXT command.
1381 * Kernel thread context (may sleep).
1384 * 0 on success, AC_ERR_* mask otherwise.
1386 static unsigned int ata_read_log_page(struct ata_device *dev,
1387 u8 page, void *buf, unsigned int sectors)
1389 struct ata_taskfile tf;
1390 unsigned int err_mask;
1392 DPRINTK("read log page - page %d\n", page);
1394 ata_tf_init(dev, &tf);
1395 tf.command = ATA_CMD_READ_LOG_EXT;
1398 tf.hob_nsect = sectors >> 8;
1399 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
1400 tf.protocol = ATA_PROT_PIO;
1402 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1403 buf, sectors * ATA_SECT_SIZE, 0);
1405 DPRINTK("EXIT, err_mask=%x\n", err_mask);
1410 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1411 * @dev: Device to read log page 10h from
1412 * @tag: Resulting tag of the failed command
1413 * @tf: Resulting taskfile registers of the failed command
1415 * Read log page 10h to obtain NCQ error details and clear error
1419 * Kernel thread context (may sleep).
1422 * 0 on success, -errno otherwise.
1424 static int ata_eh_read_log_10h(struct ata_device *dev,
1425 int *tag, struct ata_taskfile *tf)
1427 u8 *buf = dev->link->ap->sector_buf;
1428 unsigned int err_mask;
1432 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1);
1437 for (i = 0; i < ATA_SECT_SIZE; i++)
1440 ata_dev_printk(dev, KERN_WARNING,
1441 "invalid checksum 0x%x on log page 10h\n", csum);
1446 *tag = buf[0] & 0x1f;
1448 tf->command = buf[2];
1449 tf->feature = buf[3];
1453 tf->device = buf[7];
1454 tf->hob_lbal = buf[8];
1455 tf->hob_lbam = buf[9];
1456 tf->hob_lbah = buf[10];
1457 tf->nsect = buf[12];
1458 tf->hob_nsect = buf[13];
1464 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1465 * @dev: target ATAPI device
1466 * @r_sense_key: out parameter for sense_key
1468 * Perform ATAPI TEST_UNIT_READY.
1471 * EH context (may sleep).
1474 * 0 on success, AC_ERR_* mask on failure.
1476 static unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key)
1478 u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 };
1479 struct ata_taskfile tf;
1480 unsigned int err_mask;
1482 ata_tf_init(dev, &tf);
1484 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1485 tf.command = ATA_CMD_PACKET;
1486 tf.protocol = ATAPI_PROT_NODATA;
1488 err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
1489 if (err_mask == AC_ERR_DEV)
1490 *r_sense_key = tf.feature >> 4;
1495 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1496 * @dev: device to perform REQUEST_SENSE to
1497 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1498 * @dfl_sense_key: default sense key to use
1500 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1501 * SENSE. This function is EH helper.
1504 * Kernel thread context (may sleep).
1507 * 0 on success, AC_ERR_* mask on failure
1509 static unsigned int atapi_eh_request_sense(struct ata_device *dev,
1510 u8 *sense_buf, u8 dfl_sense_key)
1512 u8 cdb[ATAPI_CDB_LEN] =
1513 { REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 };
1514 struct ata_port *ap = dev->link->ap;
1515 struct ata_taskfile tf;
1517 DPRINTK("ATAPI request sense\n");
1519 /* FIXME: is this needed? */
1520 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
1522 /* initialize sense_buf with the error register,
1523 * for the case where they are -not- overwritten
1525 sense_buf[0] = 0x70;
1526 sense_buf[2] = dfl_sense_key;
1528 /* some devices time out if garbage left in tf */
1529 ata_tf_init(dev, &tf);
1531 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1532 tf.command = ATA_CMD_PACKET;
1534 /* is it pointless to prefer PIO for "safety reasons"? */
1535 if (ap->flags & ATA_FLAG_PIO_DMA) {
1536 tf.protocol = ATAPI_PROT_DMA;
1537 tf.feature |= ATAPI_PKT_DMA;
1539 tf.protocol = ATAPI_PROT_PIO;
1540 tf.lbam = SCSI_SENSE_BUFFERSIZE;
1544 return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
1545 sense_buf, SCSI_SENSE_BUFFERSIZE, 0);
1549 * ata_eh_analyze_serror - analyze SError for a failed port
1550 * @link: ATA link to analyze SError for
1552 * Analyze SError if available and further determine cause of
1558 static void ata_eh_analyze_serror(struct ata_link *link)
1560 struct ata_eh_context *ehc = &link->eh_context;
1561 u32 serror = ehc->i.serror;
1562 unsigned int err_mask = 0, action = 0;
1565 if (serror & (SERR_PERSISTENT | SERR_DATA)) {
1566 err_mask |= AC_ERR_ATA_BUS;
1567 action |= ATA_EH_RESET;
1569 if (serror & SERR_PROTOCOL) {
1570 err_mask |= AC_ERR_HSM;
1571 action |= ATA_EH_RESET;
1573 if (serror & SERR_INTERNAL) {
1574 err_mask |= AC_ERR_SYSTEM;
1575 action |= ATA_EH_RESET;
1578 /* Determine whether a hotplug event has occurred. Both
1579 * SError.N/X are considered hotplug events for enabled or
1580 * host links. For disabled PMP links, only N bit is
1581 * considered as X bit is left at 1 for link plugging.
1583 if (link->lpm_policy != ATA_LPM_MAX_POWER)
1584 hotplug_mask = 0; /* hotplug doesn't work w/ LPM */
1585 else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
1586 hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;
1588 hotplug_mask = SERR_PHYRDY_CHG;
1590 if (serror & hotplug_mask)
1591 ata_ehi_hotplugged(&ehc->i);
1593 ehc->i.err_mask |= err_mask;
1594 ehc->i.action |= action;
1598 * ata_eh_analyze_ncq_error - analyze NCQ error
1599 * @link: ATA link to analyze NCQ error for
1601 * Read log page 10h, determine the offending qc and acquire
1602 * error status TF. For NCQ device errors, all LLDDs have to do
1603 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1607 * Kernel thread context (may sleep).
1609 void ata_eh_analyze_ncq_error(struct ata_link *link)
1611 struct ata_port *ap = link->ap;
1612 struct ata_eh_context *ehc = &link->eh_context;
1613 struct ata_device *dev = link->device;
1614 struct ata_queued_cmd *qc;
1615 struct ata_taskfile tf;
1618 /* if frozen, we can't do much */
1619 if (ap->pflags & ATA_PFLAG_FROZEN)
1622 /* is it NCQ device error? */
1623 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
1626 /* has LLDD analyzed already? */
1627 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1628 qc = __ata_qc_from_tag(ap, tag);
1630 if (!(qc->flags & ATA_QCFLAG_FAILED))
1637 /* okay, this error is ours */
1638 memset(&tf, 0, sizeof(tf));
1639 rc = ata_eh_read_log_10h(dev, &tag, &tf);
1641 ata_link_printk(link, KERN_ERR, "failed to read log page 10h "
1642 "(errno=%d)\n", rc);
1646 if (!(link->sactive & (1 << tag))) {
1647 ata_link_printk(link, KERN_ERR, "log page 10h reported "
1648 "inactive tag %d\n", tag);
1652 /* we've got the perpetrator, condemn it */
1653 qc = __ata_qc_from_tag(ap, tag);
1654 memcpy(&qc->result_tf, &tf, sizeof(tf));
1655 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1656 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
1657 ehc->i.err_mask &= ~AC_ERR_DEV;
1661 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1662 * @qc: qc to analyze
1663 * @tf: Taskfile registers to analyze
1665 * Analyze taskfile of @qc and further determine cause of
1666 * failure. This function also requests ATAPI sense data if
1670 * Kernel thread context (may sleep).
1673 * Determined recovery action
1675 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
1676 const struct ata_taskfile *tf)
1678 unsigned int tmp, action = 0;
1679 u8 stat = tf->command, err = tf->feature;
1681 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
1682 qc->err_mask |= AC_ERR_HSM;
1683 return ATA_EH_RESET;
1686 if (stat & (ATA_ERR | ATA_DF))
1687 qc->err_mask |= AC_ERR_DEV;
1691 switch (qc->dev->class) {
1694 qc->err_mask |= AC_ERR_ATA_BUS;
1696 qc->err_mask |= AC_ERR_MEDIA;
1698 qc->err_mask |= AC_ERR_INVALID;
1702 if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
1703 tmp = atapi_eh_request_sense(qc->dev,
1704 qc->scsicmd->sense_buffer,
1705 qc->result_tf.feature >> 4);
1707 /* ATA_QCFLAG_SENSE_VALID is used to
1708 * tell atapi_qc_complete() that sense
1709 * data is already valid.
1711 * TODO: interpret sense data and set
1712 * appropriate err_mask.
1714 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1716 qc->err_mask |= tmp;
1720 if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
1721 action |= ATA_EH_RESET;
1726 static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask,
1731 if (!(eflags & ATA_EFLAG_DUBIOUS_XFER))
1735 base = ATA_ECAT_DUBIOUS_NONE;
1737 if (err_mask & AC_ERR_ATA_BUS)
1738 return base + ATA_ECAT_ATA_BUS;
1740 if (err_mask & AC_ERR_TIMEOUT)
1741 return base + ATA_ECAT_TOUT_HSM;
1743 if (eflags & ATA_EFLAG_IS_IO) {
1744 if (err_mask & AC_ERR_HSM)
1745 return base + ATA_ECAT_TOUT_HSM;
1747 (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
1748 return base + ATA_ECAT_UNK_DEV;
1754 struct speed_down_verdict_arg {
1757 int nr_errors[ATA_ECAT_NR];
1760 static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
1762 struct speed_down_verdict_arg *arg = void_arg;
1765 if ((ent->eflags & ATA_EFLAG_OLD_ER) || (ent->timestamp < arg->since))
1768 cat = ata_eh_categorize_error(ent->eflags, ent->err_mask,
1770 arg->nr_errors[cat]++;
1776 * ata_eh_speed_down_verdict - Determine speed down verdict
1777 * @dev: Device of interest
1779 * This function examines error ring of @dev and determines
1780 * whether NCQ needs to be turned off, transfer speed should be
1781 * stepped down, or falling back to PIO is necessary.
1783 * ECAT_ATA_BUS : ATA_BUS error for any command
1785 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1788 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1790 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1791 * data transfer hasn't been verified.
1795 * NCQ_OFF : Turn off NCQ.
1797 * SPEED_DOWN : Speed down transfer speed but don't fall back
1800 * FALLBACK_TO_PIO : Fall back to PIO.
1802 * Even if multiple verdicts are returned, only one action is
1803 * taken per error. An action triggered by non-DUBIOUS errors
1804 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1805 * This is to expedite speed down decisions right after device is
1806 * initially configured.
1808 * The followings are speed down rules. #1 and #2 deal with
1811 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1812 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1814 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1815 * occurred during last 5 mins, NCQ_OFF.
1817 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1818 * ocurred during last 5 mins, FALLBACK_TO_PIO
1820 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1821 * during last 10 mins, NCQ_OFF.
1823 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1824 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1827 * Inherited from caller.
1830 * OR of ATA_EH_SPDN_* flags.
1832 static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev)
1834 const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ;
1835 u64 j64 = get_jiffies_64();
1836 struct speed_down_verdict_arg arg;
1837 unsigned int verdict = 0;
1839 /* scan past 5 mins of error history */
1840 memset(&arg, 0, sizeof(arg));
1841 arg.since = j64 - min(j64, j5mins);
1842 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
1844 if (arg.nr_errors[ATA_ECAT_DUBIOUS_ATA_BUS] +
1845 arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1)
1846 verdict |= ATA_EH_SPDN_SPEED_DOWN |
1847 ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS;
1849 if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] +
1850 arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1)
1851 verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS;
1853 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
1854 arg.nr_errors[ATA_ECAT_TOUT_HSM] +
1855 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
1856 verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
1858 /* scan past 10 mins of error history */
1859 memset(&arg, 0, sizeof(arg));
1860 arg.since = j64 - min(j64, j10mins);
1861 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
1863 if (arg.nr_errors[ATA_ECAT_TOUT_HSM] +
1864 arg.nr_errors[ATA_ECAT_UNK_DEV] > 3)
1865 verdict |= ATA_EH_SPDN_NCQ_OFF;
1867 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
1868 arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 ||
1869 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
1870 verdict |= ATA_EH_SPDN_SPEED_DOWN;
1876 * ata_eh_speed_down - record error and speed down if necessary
1877 * @dev: Failed device
1878 * @eflags: mask of ATA_EFLAG_* flags
1879 * @err_mask: err_mask of the error
1881 * Record error and examine error history to determine whether
1882 * adjusting transmission speed is necessary. It also sets
1883 * transmission limits appropriately if such adjustment is
1887 * Kernel thread context (may sleep).
1890 * Determined recovery action.
1892 static unsigned int ata_eh_speed_down(struct ata_device *dev,
1893 unsigned int eflags, unsigned int err_mask)
1895 struct ata_link *link = ata_dev_phys_link(dev);
1897 unsigned int verdict;
1898 unsigned int action = 0;
1900 /* don't bother if Cat-0 error */
1901 if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0)
1904 /* record error and determine whether speed down is necessary */
1905 ata_ering_record(&dev->ering, eflags, err_mask);
1906 verdict = ata_eh_speed_down_verdict(dev);
1909 if ((verdict & ATA_EH_SPDN_NCQ_OFF) &&
1910 (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ |
1911 ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) {
1912 dev->flags |= ATA_DFLAG_NCQ_OFF;
1913 ata_dev_printk(dev, KERN_WARNING,
1914 "NCQ disabled due to excessive errors\n");
1919 if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
1920 /* speed down SATA link speed if possible */
1921 if (sata_down_spd_limit(link, 0) == 0) {
1922 action |= ATA_EH_RESET;
1926 /* lower transfer mode */
1927 if (dev->spdn_cnt < 2) {
1928 static const int dma_dnxfer_sel[] =
1929 { ATA_DNXFER_DMA, ATA_DNXFER_40C };
1930 static const int pio_dnxfer_sel[] =
1931 { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 };
1934 if (dev->xfer_shift != ATA_SHIFT_PIO)
1935 sel = dma_dnxfer_sel[dev->spdn_cnt];
1937 sel = pio_dnxfer_sel[dev->spdn_cnt];
1941 if (ata_down_xfermask_limit(dev, sel) == 0) {
1942 action |= ATA_EH_RESET;
1948 /* Fall back to PIO? Slowing down to PIO is meaningless for
1949 * SATA ATA devices. Consider it only for PATA and SATAPI.
1951 if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
1952 (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) &&
1953 (dev->xfer_shift != ATA_SHIFT_PIO)) {
1954 if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
1956 action |= ATA_EH_RESET;
1963 /* device has been slowed down, blow error history */
1964 if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS))
1965 ata_ering_clear(&dev->ering);
1970 * ata_eh_link_autopsy - analyze error and determine recovery action
1971 * @link: host link to perform autopsy on
1973 * Analyze why @link failed and determine which recovery actions
1974 * are needed. This function also sets more detailed AC_ERR_*
1975 * values and fills sense data for ATAPI CHECK SENSE.
1978 * Kernel thread context (may sleep).
1980 static void ata_eh_link_autopsy(struct ata_link *link)
1982 struct ata_port *ap = link->ap;
1983 struct ata_eh_context *ehc = &link->eh_context;
1984 struct ata_device *dev;
1985 unsigned int all_err_mask = 0, eflags = 0;
1992 if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
1995 /* obtain and analyze SError */
1996 rc = sata_scr_read(link, SCR_ERROR, &serror);
1998 ehc->i.serror |= serror;
1999 ata_eh_analyze_serror(link);
2000 } else if (rc != -EOPNOTSUPP) {
2001 /* SError read failed, force reset and probing */
2002 ehc->i.probe_mask |= ATA_ALL_DEVICES;
2003 ehc->i.action |= ATA_EH_RESET;
2004 ehc->i.err_mask |= AC_ERR_OTHER;
2007 /* analyze NCQ failure */
2008 ata_eh_analyze_ncq_error(link);
2010 /* any real error trumps AC_ERR_OTHER */
2011 if (ehc->i.err_mask & ~AC_ERR_OTHER)
2012 ehc->i.err_mask &= ~AC_ERR_OTHER;
2014 all_err_mask |= ehc->i.err_mask;
2016 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2017 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2019 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2020 ata_dev_phys_link(qc->dev) != link)
2023 /* inherit upper level err_mask */
2024 qc->err_mask |= ehc->i.err_mask;
2027 ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
2029 /* DEV errors are probably spurious in case of ATA_BUS error */
2030 if (qc->err_mask & AC_ERR_ATA_BUS)
2031 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
2034 /* any real error trumps unknown error */
2035 if (qc->err_mask & ~AC_ERR_OTHER)
2036 qc->err_mask &= ~AC_ERR_OTHER;
2038 /* SENSE_VALID trumps dev/unknown error and revalidation */
2039 if (qc->flags & ATA_QCFLAG_SENSE_VALID)
2040 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
2042 /* determine whether the command is worth retrying */
2043 if (qc->flags & ATA_QCFLAG_IO ||
2044 (!(qc->err_mask & AC_ERR_INVALID) &&
2045 qc->err_mask != AC_ERR_DEV))
2046 qc->flags |= ATA_QCFLAG_RETRY;
2048 /* accumulate error info */
2049 ehc->i.dev = qc->dev;
2050 all_err_mask |= qc->err_mask;
2051 if (qc->flags & ATA_QCFLAG_IO)
2052 eflags |= ATA_EFLAG_IS_IO;
2055 /* enforce default EH actions */
2056 if (ap->pflags & ATA_PFLAG_FROZEN ||
2057 all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
2058 ehc->i.action |= ATA_EH_RESET;
2059 else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) ||
2060 (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV)))
2061 ehc->i.action |= ATA_EH_REVALIDATE;
2063 /* If we have offending qcs and the associated failed device,
2064 * perform per-dev EH action only on the offending device.
2067 ehc->i.dev_action[ehc->i.dev->devno] |=
2068 ehc->i.action & ATA_EH_PERDEV_MASK;
2069 ehc->i.action &= ~ATA_EH_PERDEV_MASK;
2072 /* propagate timeout to host link */
2073 if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link))
2074 ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT;
2076 /* record error and consider speeding down */
2078 if (!dev && ((ata_link_max_devices(link) == 1 &&
2079 ata_dev_enabled(link->device))))
2083 if (dev->flags & ATA_DFLAG_DUBIOUS_XFER)
2084 eflags |= ATA_EFLAG_DUBIOUS_XFER;
2085 ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
2092 * ata_eh_autopsy - analyze error and determine recovery action
2093 * @ap: host port to perform autopsy on
2095 * Analyze all links of @ap and determine why they failed and
2096 * which recovery actions are needed.
2099 * Kernel thread context (may sleep).
2101 void ata_eh_autopsy(struct ata_port *ap)
2103 struct ata_link *link;
2105 ata_for_each_link(link, ap, EDGE)
2106 ata_eh_link_autopsy(link);
2108 /* Handle the frigging slave link. Autopsy is done similarly
2109 * but actions and flags are transferred over to the master
2110 * link and handled from there.
2112 if (ap->slave_link) {
2113 struct ata_eh_context *mehc = &ap->link.eh_context;
2114 struct ata_eh_context *sehc = &ap->slave_link->eh_context;
2116 /* transfer control flags from master to slave */
2117 sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
2119 /* perform autopsy on the slave link */
2120 ata_eh_link_autopsy(ap->slave_link);
2122 /* transfer actions from slave to master and clear slave */
2123 ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2124 mehc->i.action |= sehc->i.action;
2125 mehc->i.dev_action[1] |= sehc->i.dev_action[1];
2126 mehc->i.flags |= sehc->i.flags;
2127 ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2130 /* Autopsy of fanout ports can affect host link autopsy.
2131 * Perform host link autopsy last.
2133 if (sata_pmp_attached(ap))
2134 ata_eh_link_autopsy(&ap->link);
2138 * ata_get_cmd_descript - get description for ATA command
2139 * @command: ATA command code to get description for
2141 * Return a textual description of the given command, or NULL if the
2142 * command is not known.
2147 const char *ata_get_cmd_descript(u8 command)
2149 #ifdef CONFIG_ATA_VERBOSE_ERROR
2155 { ATA_CMD_DEV_RESET, "DEVICE RESET" },
2156 { ATA_CMD_CHK_POWER, "CHECK POWER MODE" },
2157 { ATA_CMD_STANDBY, "STANDBY" },
2158 { ATA_CMD_IDLE, "IDLE" },
2159 { ATA_CMD_EDD, "EXECUTE DEVICE DIAGNOSTIC" },
2160 { ATA_CMD_DOWNLOAD_MICRO, "DOWNLOAD MICROCODE" },
2161 { ATA_CMD_NOP, "NOP" },
2162 { ATA_CMD_FLUSH, "FLUSH CACHE" },
2163 { ATA_CMD_FLUSH_EXT, "FLUSH CACHE EXT" },
2164 { ATA_CMD_ID_ATA, "IDENTIFY DEVICE" },
2165 { ATA_CMD_ID_ATAPI, "IDENTIFY PACKET DEVICE" },
2166 { ATA_CMD_SERVICE, "SERVICE" },
2167 { ATA_CMD_READ, "READ DMA" },
2168 { ATA_CMD_READ_EXT, "READ DMA EXT" },
2169 { ATA_CMD_READ_QUEUED, "READ DMA QUEUED" },
2170 { ATA_CMD_READ_STREAM_EXT, "READ STREAM EXT" },
2171 { ATA_CMD_READ_STREAM_DMA_EXT, "READ STREAM DMA EXT" },
2172 { ATA_CMD_WRITE, "WRITE DMA" },
2173 { ATA_CMD_WRITE_EXT, "WRITE DMA EXT" },
2174 { ATA_CMD_WRITE_QUEUED, "WRITE DMA QUEUED EXT" },
2175 { ATA_CMD_WRITE_STREAM_EXT, "WRITE STREAM EXT" },
2176 { ATA_CMD_WRITE_STREAM_DMA_EXT, "WRITE STREAM DMA EXT" },
2177 { ATA_CMD_WRITE_FUA_EXT, "WRITE DMA FUA EXT" },
2178 { ATA_CMD_WRITE_QUEUED_FUA_EXT, "WRITE DMA QUEUED FUA EXT" },
2179 { ATA_CMD_FPDMA_READ, "READ FPDMA QUEUED" },
2180 { ATA_CMD_FPDMA_WRITE, "WRITE FPDMA QUEUED" },
2181 { ATA_CMD_PIO_READ, "READ SECTOR(S)" },
2182 { ATA_CMD_PIO_READ_EXT, "READ SECTOR(S) EXT" },
2183 { ATA_CMD_PIO_WRITE, "WRITE SECTOR(S)" },
2184 { ATA_CMD_PIO_WRITE_EXT, "WRITE SECTOR(S) EXT" },
2185 { ATA_CMD_READ_MULTI, "READ MULTIPLE" },
2186 { ATA_CMD_READ_MULTI_EXT, "READ MULTIPLE EXT" },
2187 { ATA_CMD_WRITE_MULTI, "WRITE MULTIPLE" },
2188 { ATA_CMD_WRITE_MULTI_EXT, "WRITE MULTIPLE EXT" },
2189 { ATA_CMD_WRITE_MULTI_FUA_EXT, "WRITE MULTIPLE FUA EXT" },
2190 { ATA_CMD_SET_FEATURES, "SET FEATURES" },
2191 { ATA_CMD_SET_MULTI, "SET MULTIPLE MODE" },
2192 { ATA_CMD_VERIFY, "READ VERIFY SECTOR(S)" },
2193 { ATA_CMD_VERIFY_EXT, "READ VERIFY SECTOR(S) EXT" },
2194 { ATA_CMD_WRITE_UNCORR_EXT, "WRITE UNCORRECTABLE EXT" },
2195 { ATA_CMD_STANDBYNOW1, "STANDBY IMMEDIATE" },
2196 { ATA_CMD_IDLEIMMEDIATE, "IDLE IMMEDIATE" },
2197 { ATA_CMD_SLEEP, "SLEEP" },
2198 { ATA_CMD_INIT_DEV_PARAMS, "INITIALIZE DEVICE PARAMETERS" },
2199 { ATA_CMD_READ_NATIVE_MAX, "READ NATIVE MAX ADDRESS" },
2200 { ATA_CMD_READ_NATIVE_MAX_EXT, "READ NATIVE MAX ADDRESS EXT" },
2201 { ATA_CMD_SET_MAX, "SET MAX ADDRESS" },
2202 { ATA_CMD_SET_MAX_EXT, "SET MAX ADDRESS EXT" },
2203 { ATA_CMD_READ_LOG_EXT, "READ LOG EXT" },
2204 { ATA_CMD_WRITE_LOG_EXT, "WRITE LOG EXT" },
2205 { ATA_CMD_READ_LOG_DMA_EXT, "READ LOG DMA EXT" },
2206 { ATA_CMD_WRITE_LOG_DMA_EXT, "WRITE LOG DMA EXT" },
2207 { ATA_CMD_TRUSTED_RCV, "TRUSTED RECEIVE" },
2208 { ATA_CMD_TRUSTED_RCV_DMA, "TRUSTED RECEIVE DMA" },
2209 { ATA_CMD_TRUSTED_SND, "TRUSTED SEND" },
2210 { ATA_CMD_TRUSTED_SND_DMA, "TRUSTED SEND DMA" },
2211 { ATA_CMD_PMP_READ, "READ BUFFER" },
2212 { ATA_CMD_PMP_WRITE, "WRITE BUFFER" },
2213 { ATA_CMD_CONF_OVERLAY, "DEVICE CONFIGURATION OVERLAY" },
2214 { ATA_CMD_SEC_SET_PASS, "SECURITY SET PASSWORD" },
2215 { ATA_CMD_SEC_UNLOCK, "SECURITY UNLOCK" },
2216 { ATA_CMD_SEC_ERASE_PREP, "SECURITY ERASE PREPARE" },
2217 { ATA_CMD_SEC_ERASE_UNIT, "SECURITY ERASE UNIT" },
2218 { ATA_CMD_SEC_FREEZE_LOCK, "SECURITY FREEZE LOCK" },
2219 { ATA_CMD_SEC_DISABLE_PASS, "SECURITY DISABLE PASSWORD" },
2220 { ATA_CMD_CONFIG_STREAM, "CONFIGURE STREAM" },
2221 { ATA_CMD_SMART, "SMART" },
2222 { ATA_CMD_MEDIA_LOCK, "DOOR LOCK" },
2223 { ATA_CMD_MEDIA_UNLOCK, "DOOR UNLOCK" },
2224 { ATA_CMD_DSM, "DATA SET MANAGEMENT" },
2225 { ATA_CMD_CHK_MED_CRD_TYP, "CHECK MEDIA CARD TYPE" },
2226 { ATA_CMD_CFA_REQ_EXT_ERR, "CFA REQUEST EXTENDED ERROR" },
2227 { ATA_CMD_CFA_WRITE_NE, "CFA WRITE SECTORS WITHOUT ERASE" },
2228 { ATA_CMD_CFA_TRANS_SECT, "CFA TRANSLATE SECTOR" },
2229 { ATA_CMD_CFA_ERASE, "CFA ERASE SECTORS" },
2230 { ATA_CMD_CFA_WRITE_MULT_NE, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2231 { ATA_CMD_READ_LONG, "READ LONG (with retries)" },
2232 { ATA_CMD_READ_LONG_ONCE, "READ LONG (without retries)" },
2233 { ATA_CMD_WRITE_LONG, "WRITE LONG (with retries)" },
2234 { ATA_CMD_WRITE_LONG_ONCE, "WRITE LONG (without retries)" },
2235 { ATA_CMD_RESTORE, "RECALIBRATE" },
2236 { 0, NULL } /* terminate list */
2240 for (i = 0; cmd_descr[i].text; i++)
2241 if (cmd_descr[i].command == command)
2242 return cmd_descr[i].text;
2249 * ata_eh_link_report - report error handling to user
2250 * @link: ATA link EH is going on
2252 * Report EH to user.
2257 static void ata_eh_link_report(struct ata_link *link)
2259 struct ata_port *ap = link->ap;
2260 struct ata_eh_context *ehc = &link->eh_context;
2261 const char *frozen, *desc;
2263 int tag, nr_failed = 0;
2265 if (ehc->i.flags & ATA_EHI_QUIET)
2269 if (ehc->i.desc[0] != '\0')
2272 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2273 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2275 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2276 ata_dev_phys_link(qc->dev) != link ||
2277 ((qc->flags & ATA_QCFLAG_QUIET) &&
2278 qc->err_mask == AC_ERR_DEV))
2280 if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
2286 if (!nr_failed && !ehc->i.err_mask)
2290 if (ap->pflags & ATA_PFLAG_FROZEN)
2293 memset(tries_buf, 0, sizeof(tries_buf));
2294 if (ap->eh_tries < ATA_EH_MAX_TRIES)
2295 snprintf(tries_buf, sizeof(tries_buf) - 1, " t%d",
2299 ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x "
2300 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2301 ehc->i.err_mask, link->sactive, ehc->i.serror,
2302 ehc->i.action, frozen, tries_buf);
2304 ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc);
2306 ata_link_printk(link, KERN_ERR, "exception Emask 0x%x "
2307 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2308 ehc->i.err_mask, link->sactive, ehc->i.serror,
2309 ehc->i.action, frozen, tries_buf);
2311 ata_link_printk(link, KERN_ERR, "%s\n", desc);
2314 #ifdef CONFIG_ATA_VERBOSE_ERROR
2316 ata_link_printk(link, KERN_ERR,
2317 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2318 ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "",
2319 ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "",
2320 ehc->i.serror & SERR_DATA ? "UnrecovData " : "",
2321 ehc->i.serror & SERR_PERSISTENT ? "Persist " : "",
2322 ehc->i.serror & SERR_PROTOCOL ? "Proto " : "",
2323 ehc->i.serror & SERR_INTERNAL ? "HostInt " : "",
2324 ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "",
2325 ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "",
2326 ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "",
2327 ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "",
2328 ehc->i.serror & SERR_DISPARITY ? "Dispar " : "",
2329 ehc->i.serror & SERR_CRC ? "BadCRC " : "",
2330 ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "",
2331 ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "",
2332 ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "",
2333 ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "",
2334 ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : "");
2337 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2338 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2339 struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
2340 const u8 *cdb = qc->cdb;
2341 char data_buf[20] = "";
2342 char cdb_buf[70] = "";
2344 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2345 ata_dev_phys_link(qc->dev) != link || !qc->err_mask)
2348 if (qc->dma_dir != DMA_NONE) {
2349 static const char *dma_str[] = {
2350 [DMA_BIDIRECTIONAL] = "bidi",
2351 [DMA_TO_DEVICE] = "out",
2352 [DMA_FROM_DEVICE] = "in",
2354 static const char *prot_str[] = {
2355 [ATA_PROT_PIO] = "pio",
2356 [ATA_PROT_DMA] = "dma",
2357 [ATA_PROT_NCQ] = "ncq",
2358 [ATAPI_PROT_PIO] = "pio",
2359 [ATAPI_PROT_DMA] = "dma",
2362 snprintf(data_buf, sizeof(data_buf), " %s %u %s",
2363 prot_str[qc->tf.protocol], qc->nbytes,
2364 dma_str[qc->dma_dir]);
2367 if (ata_is_atapi(qc->tf.protocol)) {
2369 scsi_print_command(qc->scsicmd);
2371 snprintf(cdb_buf, sizeof(cdb_buf),
2372 "cdb %02x %02x %02x %02x %02x %02x %02x %02x "
2373 "%02x %02x %02x %02x %02x %02x %02x %02x\n ",
2374 cdb[0], cdb[1], cdb[2], cdb[3],
2375 cdb[4], cdb[5], cdb[6], cdb[7],
2376 cdb[8], cdb[9], cdb[10], cdb[11],
2377 cdb[12], cdb[13], cdb[14], cdb[15]);
2379 const char *descr = ata_get_cmd_descript(cmd->command);
2381 ata_dev_printk(qc->dev, KERN_ERR,
2382 "failed command: %s\n", descr);
2385 ata_dev_printk(qc->dev, KERN_ERR,
2386 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2388 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2389 "Emask 0x%x (%s)%s\n",
2390 cmd->command, cmd->feature, cmd->nsect,
2391 cmd->lbal, cmd->lbam, cmd->lbah,
2392 cmd->hob_feature, cmd->hob_nsect,
2393 cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,
2394 cmd->device, qc->tag, data_buf, cdb_buf,
2395 res->command, res->feature, res->nsect,
2396 res->lbal, res->lbam, res->lbah,
2397 res->hob_feature, res->hob_nsect,
2398 res->hob_lbal, res->hob_lbam, res->hob_lbah,
2399 res->device, qc->err_mask, ata_err_string(qc->err_mask),
2400 qc->err_mask & AC_ERR_NCQ ? " <F>" : "");
2402 #ifdef CONFIG_ATA_VERBOSE_ERROR
2403 if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ |
2405 if (res->command & ATA_BUSY)
2406 ata_dev_printk(qc->dev, KERN_ERR,
2407 "status: { Busy }\n");
2409 ata_dev_printk(qc->dev, KERN_ERR,
2410 "status: { %s%s%s%s}\n",
2411 res->command & ATA_DRDY ? "DRDY " : "",
2412 res->command & ATA_DF ? "DF " : "",
2413 res->command & ATA_DRQ ? "DRQ " : "",
2414 res->command & ATA_ERR ? "ERR " : "");
2417 if (cmd->command != ATA_CMD_PACKET &&
2418 (res->feature & (ATA_ICRC | ATA_UNC | ATA_IDNF |
2420 ata_dev_printk(qc->dev, KERN_ERR,
2421 "error: { %s%s%s%s}\n",
2422 res->feature & ATA_ICRC ? "ICRC " : "",
2423 res->feature & ATA_UNC ? "UNC " : "",
2424 res->feature & ATA_IDNF ? "IDNF " : "",
2425 res->feature & ATA_ABORTED ? "ABRT " : "");
2431 * ata_eh_report - report error handling to user
2432 * @ap: ATA port to report EH about
2434 * Report EH to user.
2439 void ata_eh_report(struct ata_port *ap)
2441 struct ata_link *link;
2443 ata_for_each_link(link, ap, HOST_FIRST)
2444 ata_eh_link_report(link);
2447 static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
2448 unsigned int *classes, unsigned long deadline,
2451 struct ata_device *dev;
2454 ata_for_each_dev(dev, link, ALL)
2455 classes[dev->devno] = ATA_DEV_UNKNOWN;
2457 return reset(link, classes, deadline);
2460 static int ata_eh_followup_srst_needed(struct ata_link *link,
2461 int rc, const unsigned int *classes)
2463 if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link))
2467 if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
2472 int ata_eh_reset(struct ata_link *link, int classify,
2473 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
2474 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
2476 struct ata_port *ap = link->ap;
2477 struct ata_link *slave = ap->slave_link;
2478 struct ata_eh_context *ehc = &link->eh_context;
2479 struct ata_eh_context *sehc = slave ? &slave->eh_context : NULL;
2480 unsigned int *classes = ehc->classes;
2481 unsigned int lflags = link->flags;
2482 int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
2483 int max_tries = 0, try = 0;
2484 struct ata_link *failed_link;
2485 struct ata_device *dev;
2486 unsigned long deadline, now;
2487 ata_reset_fn_t reset;
2488 unsigned long flags;
2495 while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
2497 if (link->flags & ATA_LFLAG_NO_HRST)
2499 if (link->flags & ATA_LFLAG_NO_SRST)
2502 /* make sure each reset attemp is at least COOL_DOWN apart */
2503 if (ehc->i.flags & ATA_EHI_DID_RESET) {
2505 WARN_ON(time_after(ehc->last_reset, now));
2506 deadline = ata_deadline(ehc->last_reset,
2507 ATA_EH_RESET_COOL_DOWN);
2508 if (time_before(now, deadline))
2509 schedule_timeout_uninterruptible(deadline - now);
2512 spin_lock_irqsave(ap->lock, flags);
2513 ap->pflags |= ATA_PFLAG_RESETTING;
2514 spin_unlock_irqrestore(ap->lock, flags);
2516 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
2518 ata_for_each_dev(dev, link, ALL) {
2519 /* If we issue an SRST then an ATA drive (not ATAPI)
2520 * may change configuration and be in PIO0 timing. If
2521 * we do a hard reset (or are coming from power on)
2522 * this is true for ATA or ATAPI. Until we've set a
2523 * suitable controller mode we should not touch the
2524 * bus as we may be talking too fast.
2526 dev->pio_mode = XFER_PIO_0;
2528 /* If the controller has a pio mode setup function
2529 * then use it to set the chipset to rights. Don't
2530 * touch the DMA setup as that will be dealt with when
2531 * configuring devices.
2533 if (ap->ops->set_piomode)
2534 ap->ops->set_piomode(ap, dev);
2537 /* prefer hardreset */
2539 ehc->i.action &= ~ATA_EH_RESET;
2542 ehc->i.action |= ATA_EH_HARDRESET;
2543 } else if (softreset) {
2545 ehc->i.action |= ATA_EH_SOFTRESET;
2549 unsigned long deadline = ata_deadline(jiffies,
2550 ATA_EH_PRERESET_TIMEOUT);
2553 sehc->i.action &= ~ATA_EH_RESET;
2554 sehc->i.action |= ehc->i.action;
2557 rc = prereset(link, deadline);
2559 /* If present, do prereset on slave link too. Reset
2560 * is skipped iff both master and slave links report
2561 * -ENOENT or clear ATA_EH_RESET.
2563 if (slave && (rc == 0 || rc == -ENOENT)) {
2566 tmp = prereset(slave, deadline);
2570 ehc->i.action |= sehc->i.action;
2574 if (rc == -ENOENT) {
2575 ata_link_printk(link, KERN_DEBUG,
2576 "port disabled. ignoring.\n");
2577 ehc->i.action &= ~ATA_EH_RESET;
2579 ata_for_each_dev(dev, link, ALL)
2580 classes[dev->devno] = ATA_DEV_NONE;
2584 ata_link_printk(link, KERN_ERR,
2585 "prereset failed (errno=%d)\n", rc);
2589 /* prereset() might have cleared ATA_EH_RESET. If so,
2590 * bang classes, thaw and return.
2592 if (reset && !(ehc->i.action & ATA_EH_RESET)) {
2593 ata_for_each_dev(dev, link, ALL)
2594 classes[dev->devno] = ATA_DEV_NONE;
2595 if ((ap->pflags & ATA_PFLAG_FROZEN) &&
2596 ata_is_host_link(link))
2597 ata_eh_thaw_port(ap);
2607 if (ata_is_host_link(link))
2608 ata_eh_freeze_port(ap);
2610 deadline = ata_deadline(jiffies, ata_eh_reset_timeouts[try++]);
2614 ata_link_printk(link, KERN_INFO, "%s resetting link\n",
2615 reset == softreset ? "soft" : "hard");
2617 /* mark that this EH session started with reset */
2618 ehc->last_reset = jiffies;
2619 if (reset == hardreset)
2620 ehc->i.flags |= ATA_EHI_DID_HARDRESET;
2622 ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
2624 rc = ata_do_reset(link, reset, classes, deadline, true);
2625 if (rc && rc != -EAGAIN) {
2630 /* hardreset slave link if existent */
2631 if (slave && reset == hardreset) {
2635 ata_link_printk(slave, KERN_INFO,
2636 "hard resetting link\n");
2638 ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
2639 tmp = ata_do_reset(slave, reset, classes, deadline,
2647 failed_link = slave;
2653 /* perform follow-up SRST if necessary */
2654 if (reset == hardreset &&
2655 ata_eh_followup_srst_needed(link, rc, classes)) {
2659 ata_link_printk(link, KERN_ERR,
2660 "follow-up softreset required "
2661 "but no softreset avaliable\n");
2667 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
2668 rc = ata_do_reset(link, reset, classes, deadline, true);
2676 ata_link_printk(link, KERN_INFO, "no reset method "
2677 "available, skipping reset\n");
2678 if (!(lflags & ATA_LFLAG_ASSUME_CLASS))
2679 lflags |= ATA_LFLAG_ASSUME_ATA;
2683 * Post-reset processing
2685 ata_for_each_dev(dev, link, ALL) {
2686 /* After the reset, the device state is PIO 0 and the
2687 * controller state is undefined. Reset also wakes up
2688 * drives from sleeping mode.
2690 dev->pio_mode = XFER_PIO_0;
2691 dev->flags &= ~ATA_DFLAG_SLEEPING;
2693 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
2696 /* apply class override */
2697 if (lflags & ATA_LFLAG_ASSUME_ATA)
2698 classes[dev->devno] = ATA_DEV_ATA;
2699 else if (lflags & ATA_LFLAG_ASSUME_SEMB)
2700 classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
2703 /* record current link speed */
2704 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
2705 link->sata_spd = (sstatus >> 4) & 0xf;
2706 if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0)
2707 slave->sata_spd = (sstatus >> 4) & 0xf;
2710 if (ata_is_host_link(link))
2711 ata_eh_thaw_port(ap);
2713 /* postreset() should clear hardware SError. Although SError
2714 * is cleared during link resume, clearing SError here is
2715 * necessary as some PHYs raise hotplug events after SRST.
2716 * This introduces race condition where hotplug occurs between
2717 * reset and here. This race is mediated by cross checking
2718 * link onlineness and classification result later.
2721 postreset(link, classes);
2723 postreset(slave, classes);
2727 * Some controllers can't be frozen very well and may set
2728 * spuruious error conditions during reset. Clear accumulated
2729 * error information. As reset is the final recovery action,
2730 * nothing is lost by doing this.
2732 spin_lock_irqsave(link->ap->lock, flags);
2733 memset(&link->eh_info, 0, sizeof(link->eh_info));
2735 memset(&slave->eh_info, 0, sizeof(link->eh_info));
2736 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
2737 spin_unlock_irqrestore(link->ap->lock, flags);
2740 * Make sure onlineness and classification result correspond.
2741 * Hotplug could have happened during reset and some
2742 * controllers fail to wait while a drive is spinning up after
2743 * being hotplugged causing misdetection. By cross checking
2744 * link on/offlineness and classification result, those
2745 * conditions can be reliably detected and retried.
2748 ata_for_each_dev(dev, link, ALL) {
2749 if (ata_phys_link_online(ata_dev_phys_link(dev))) {
2750 if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
2751 ata_dev_printk(dev, KERN_DEBUG, "link online "
2752 "but device misclassifed\n");
2753 classes[dev->devno] = ATA_DEV_NONE;
2756 } else if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
2757 if (ata_class_enabled(classes[dev->devno]))
2758 ata_dev_printk(dev, KERN_DEBUG, "link offline, "
2759 "clearing class %d to NONE\n",
2760 classes[dev->devno]);
2761 classes[dev->devno] = ATA_DEV_NONE;
2762 } else if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
2763 ata_dev_printk(dev, KERN_DEBUG, "link status unknown, "
2764 "clearing UNKNOWN to NONE\n");
2765 classes[dev->devno] = ATA_DEV_NONE;
2769 if (classify && nr_unknown) {
2770 if (try < max_tries) {
2771 ata_link_printk(link, KERN_WARNING, "link online but "
2772 "%d devices misclassified, retrying\n",
2778 ata_link_printk(link, KERN_WARNING,
2779 "link online but %d devices misclassified, "
2780 "device detection might fail\n", nr_unknown);
2783 /* reset successful, schedule revalidation */
2784 ata_eh_done(link, NULL, ATA_EH_RESET);
2786 ata_eh_done(slave, NULL, ATA_EH_RESET);
2787 ehc->last_reset = jiffies; /* update to completion time */
2788 ehc->i.action |= ATA_EH_REVALIDATE;
2789 link->lpm_policy = ATA_LPM_UNKNOWN; /* reset LPM state */
2793 /* clear hotplug flag */
2794 ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
2796 sehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
2798 spin_lock_irqsave(ap->lock, flags);
2799 ap->pflags &= ~ATA_PFLAG_RESETTING;
2800 spin_unlock_irqrestore(ap->lock, flags);
2805 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2806 if (!ata_is_host_link(link) &&
2807 sata_scr_read(link, SCR_STATUS, &sstatus))
2810 if (rc == -ERESTART || try >= max_tries)
2814 if (time_before(now, deadline)) {
2815 unsigned long delta = deadline - now;
2817 ata_link_printk(failed_link, KERN_WARNING,
2818 "reset failed (errno=%d), retrying in %u secs\n",
2819 rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
2822 delta = schedule_timeout_uninterruptible(delta);
2825 if (try == max_tries - 1) {
2826 sata_down_spd_limit(link, 0);
2828 sata_down_spd_limit(slave, 0);
2829 } else if (rc == -EPIPE)
2830 sata_down_spd_limit(failed_link, 0);
2837 static inline void ata_eh_pull_park_action(struct ata_port *ap)
2839 struct ata_link *link;
2840 struct ata_device *dev;
2841 unsigned long flags;
2844 * This function can be thought of as an extended version of
2845 * ata_eh_about_to_do() specially crafted to accommodate the
2846 * requirements of ATA_EH_PARK handling. Since the EH thread
2847 * does not leave the do {} while () loop in ata_eh_recover as
2848 * long as the timeout for a park request to *one* device on
2849 * the port has not expired, and since we still want to pick
2850 * up park requests to other devices on the same port or
2851 * timeout updates for the same device, we have to pull
2852 * ATA_EH_PARK actions from eh_info into eh_context.i
2853 * ourselves at the beginning of each pass over the loop.
2855 * Additionally, all write accesses to &ap->park_req_pending
2856 * through INIT_COMPLETION() (see below) or complete_all()
2857 * (see ata_scsi_park_store()) are protected by the host lock.
2858 * As a result we have that park_req_pending.done is zero on
2859 * exit from this function, i.e. when ATA_EH_PARK actions for
2860 * *all* devices on port ap have been pulled into the
2861 * respective eh_context structs. If, and only if,
2862 * park_req_pending.done is non-zero by the time we reach
2863 * wait_for_completion_timeout(), another ATA_EH_PARK action
2864 * has been scheduled for at least one of the devices on port
2865 * ap and we have to cycle over the do {} while () loop in
2866 * ata_eh_recover() again.
2869 spin_lock_irqsave(ap->lock, flags);
2870 INIT_COMPLETION(ap->park_req_pending);
2871 ata_for_each_link(link, ap, EDGE) {
2872 ata_for_each_dev(dev, link, ALL) {
2873 struct ata_eh_info *ehi = &link->eh_info;
2875 link->eh_context.i.dev_action[dev->devno] |=
2876 ehi->dev_action[dev->devno] & ATA_EH_PARK;
2877 ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK);
2880 spin_unlock_irqrestore(ap->lock, flags);
2883 static void ata_eh_park_issue_cmd(struct ata_device *dev, int park)
2885 struct ata_eh_context *ehc = &dev->link->eh_context;
2886 struct ata_taskfile tf;
2887 unsigned int err_mask;
2889 ata_tf_init(dev, &tf);
2891 ehc->unloaded_mask |= 1 << dev->devno;
2892 tf.command = ATA_CMD_IDLEIMMEDIATE;
2898 ehc->unloaded_mask &= ~(1 << dev->devno);
2899 tf.command = ATA_CMD_CHK_POWER;
2902 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
2903 tf.protocol |= ATA_PROT_NODATA;
2904 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
2905 if (park && (err_mask || tf.lbal != 0xc4)) {
2906 ata_dev_printk(dev, KERN_ERR, "head unload failed!\n");
2907 ehc->unloaded_mask &= ~(1 << dev->devno);
2911 static int ata_eh_revalidate_and_attach(struct ata_link *link,
2912 struct ata_device **r_failed_dev)
2914 struct ata_port *ap = link->ap;
2915 struct ata_eh_context *ehc = &link->eh_context;
2916 struct ata_device *dev;
2917 unsigned int new_mask = 0;
2918 unsigned long flags;
2923 /* For PATA drive side cable detection to work, IDENTIFY must
2924 * be done backwards such that PDIAG- is released by the slave
2925 * device before the master device is identified.
2927 ata_for_each_dev(dev, link, ALL_REVERSE) {
2928 unsigned int action = ata_eh_dev_action(dev);
2929 unsigned int readid_flags = 0;
2931 if (ehc->i.flags & ATA_EHI_DID_RESET)
2932 readid_flags |= ATA_READID_POSTRESET;
2934 if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
2935 WARN_ON(dev->class == ATA_DEV_PMP);
2937 if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
2942 ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE);
2943 rc = ata_dev_revalidate(dev, ehc->classes[dev->devno],
2948 ata_eh_done(link, dev, ATA_EH_REVALIDATE);
2950 /* Configuration may have changed, reconfigure
2953 ehc->i.flags |= ATA_EHI_SETMODE;
2955 /* schedule the scsi_rescan_device() here */
2956 schedule_work(&(ap->scsi_rescan_task));
2957 } else if (dev->class == ATA_DEV_UNKNOWN &&
2958 ehc->tries[dev->devno] &&
2959 ata_class_enabled(ehc->classes[dev->devno])) {
2960 /* Temporarily set dev->class, it will be
2961 * permanently set once all configurations are
2962 * complete. This is necessary because new
2963 * device configuration is done in two
2966 dev->class = ehc->classes[dev->devno];
2968 if (dev->class == ATA_DEV_PMP)
2969 rc = sata_pmp_attach(dev);
2971 rc = ata_dev_read_id(dev, &dev->class,
2972 readid_flags, dev->id);
2974 /* read_id might have changed class, store and reset */
2975 ehc->classes[dev->devno] = dev->class;
2976 dev->class = ATA_DEV_UNKNOWN;
2980 /* clear error info accumulated during probe */
2981 ata_ering_clear(&dev->ering);
2982 new_mask |= 1 << dev->devno;
2985 /* IDENTIFY was issued to non-existent
2986 * device. No need to reset. Just
2987 * thaw and ignore the device.
2989 ata_eh_thaw_port(ap);
2997 /* PDIAG- should have been released, ask cable type if post-reset */
2998 if ((ehc->i.flags & ATA_EHI_DID_RESET) && ata_is_host_link(link)) {
2999 if (ap->ops->cable_detect)
3000 ap->cbl = ap->ops->cable_detect(ap);
3004 /* Configure new devices forward such that user doesn't see
3005 * device detection messages backwards.
3007 ata_for_each_dev(dev, link, ALL) {
3008 if (!(new_mask & (1 << dev->devno)))
3011 dev->class = ehc->classes[dev->devno];
3013 if (dev->class == ATA_DEV_PMP)
3016 ehc->i.flags |= ATA_EHI_PRINTINFO;
3017 rc = ata_dev_configure(dev);
3018 ehc->i.flags &= ~ATA_EHI_PRINTINFO;
3020 dev->class = ATA_DEV_UNKNOWN;
3024 spin_lock_irqsave(ap->lock, flags);
3025 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
3026 spin_unlock_irqrestore(ap->lock, flags);
3028 /* new device discovered, configure xfermode */
3029 ehc->i.flags |= ATA_EHI_SETMODE;
3035 *r_failed_dev = dev;
3036 DPRINTK("EXIT rc=%d\n", rc);
3041 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3042 * @link: link on which timings will be programmed
3043 * @r_failed_dev: out parameter for failed device
3045 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3046 * ata_set_mode() fails, pointer to the failing device is
3047 * returned in @r_failed_dev.
3050 * PCI/etc. bus probe sem.
3053 * 0 on success, negative errno otherwise
3055 int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3057 struct ata_port *ap = link->ap;
3058 struct ata_device *dev;
3061 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
3062 ata_for_each_dev(dev, link, ENABLED) {
3063 if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) {
3064 struct ata_ering_entry *ent;
3066 ent = ata_ering_top(&dev->ering);
3068 ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER;
3072 /* has private set_mode? */
3073 if (ap->ops->set_mode)
3074 rc = ap->ops->set_mode(link, r_failed_dev);
3076 rc = ata_do_set_mode(link, r_failed_dev);
3078 /* if transfer mode has changed, set DUBIOUS_XFER on device */
3079 ata_for_each_dev(dev, link, ENABLED) {
3080 struct ata_eh_context *ehc = &link->eh_context;
3081 u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
3082 u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
3084 if (dev->xfer_mode != saved_xfer_mode ||
3085 ata_ncq_enabled(dev) != saved_ncq)
3086 dev->flags |= ATA_DFLAG_DUBIOUS_XFER;
3093 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3094 * @dev: ATAPI device to clear UA for
3096 * Resets and other operations can make an ATAPI device raise
3097 * UNIT ATTENTION which causes the next operation to fail. This
3098 * function clears UA.
3101 * EH context (may sleep).
3104 * 0 on success, -errno on failure.
3106 static int atapi_eh_clear_ua(struct ata_device *dev)
3110 for (i = 0; i < ATA_EH_UA_TRIES; i++) {
3111 u8 *sense_buffer = dev->link->ap->sector_buf;
3113 unsigned int err_mask;
3115 err_mask = atapi_eh_tur(dev, &sense_key);
3116 if (err_mask != 0 && err_mask != AC_ERR_DEV) {
3117 ata_dev_printk(dev, KERN_WARNING, "TEST_UNIT_READY "
3118 "failed (err_mask=0x%x)\n", err_mask);
3122 if (!err_mask || sense_key != UNIT_ATTENTION)
3125 err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
3127 ata_dev_printk(dev, KERN_WARNING, "failed to clear "
3128 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
3133 ata_dev_printk(dev, KERN_WARNING,
3134 "UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES);
3140 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3141 * @dev: ATA device which may need FLUSH retry
3143 * If @dev failed FLUSH, it needs to be reported upper layer
3144 * immediately as it means that @dev failed to remap and already
3145 * lost at least a sector and further FLUSH retrials won't make
3146 * any difference to the lost sector. However, if FLUSH failed
3147 * for other reasons, for example transmission error, FLUSH needs
3150 * This function determines whether FLUSH failure retry is
3151 * necessary and performs it if so.
3154 * 0 if EH can continue, -errno if EH needs to be repeated.
3156 static int ata_eh_maybe_retry_flush(struct ata_device *dev)
3158 struct ata_link *link = dev->link;
3159 struct ata_port *ap = link->ap;
3160 struct ata_queued_cmd *qc;
3161 struct ata_taskfile tf;
3162 unsigned int err_mask;
3165 /* did flush fail for this device? */
3166 if (!ata_tag_valid(link->active_tag))
3169 qc = __ata_qc_from_tag(ap, link->active_tag);
3170 if (qc->dev != dev || (qc->tf.command != ATA_CMD_FLUSH_EXT &&
3171 qc->tf.command != ATA_CMD_FLUSH))
3174 /* if the device failed it, it should be reported to upper layers */
3175 if (qc->err_mask & AC_ERR_DEV)
3178 /* flush failed for some other reason, give it another shot */
3179 ata_tf_init(dev, &tf);
3181 tf.command = qc->tf.command;
3182 tf.flags |= ATA_TFLAG_DEVICE;
3183 tf.protocol = ATA_PROT_NODATA;
3185 ata_dev_printk(dev, KERN_WARNING, "retrying FLUSH 0x%x Emask 0x%x\n",
3186 tf.command, qc->err_mask);
3188 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3191 * FLUSH is complete but there's no way to
3192 * successfully complete a failed command from EH.
3193 * Making sure retry is allowed at least once and
3194 * retrying it should do the trick - whatever was in
3195 * the cache is already on the platter and this won't
3196 * cause infinite loop.
3198 qc->scsicmd->allowed = max(qc->scsicmd->allowed, 1);
3200 ata_dev_printk(dev, KERN_WARNING, "FLUSH failed Emask 0x%x\n",
3204 /* if device failed it, report it to upper layers */
3205 if (err_mask & AC_ERR_DEV) {
3206 qc->err_mask |= AC_ERR_DEV;
3208 if (!(ap->pflags & ATA_PFLAG_FROZEN))
3216 * ata_eh_set_lpm - configure SATA interface power management
3217 * @link: link to configure power management
3218 * @policy: the link power management policy
3219 * @r_failed_dev: out parameter for failed device
3221 * Enable SATA Interface power management. This will enable
3222 * Device Interface Power Management (DIPM) for min_power
3223 * policy, and then call driver specific callbacks for
3224 * enabling Host Initiated Power management.
3230 * 0 on success, -errno on failure.
3232 static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3233 struct ata_device **r_failed_dev)
3235 struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
3236 struct ata_eh_context *ehc = &link->eh_context;
3237 struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
3238 unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
3239 unsigned int err_mask;
3242 /* if the link or host doesn't do LPM, noop */
3243 if ((link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
3247 * DIPM is enabled only for MIN_POWER as some devices
3248 * misbehave when the host NACKs transition to SLUMBER. Order
3249 * device and link configurations such that the host always
3250 * allows DIPM requests.
3252 ata_for_each_dev(dev, link, ENABLED) {
3253 bool hipm = ata_id_has_hipm(dev->id);
3254 bool dipm = ata_id_has_dipm(dev->id);
3256 /* find the first enabled and LPM enabled devices */
3260 if (!lpm_dev && (hipm || dipm))
3263 hints &= ~ATA_LPM_EMPTY;
3265 hints &= ~ATA_LPM_HIPM;
3267 /* disable DIPM before changing link config */
3268 if (policy != ATA_LPM_MIN_POWER && dipm) {
3269 err_mask = ata_dev_set_feature(dev,
3270 SETFEATURES_SATA_DISABLE, SATA_DIPM);
3271 if (err_mask && err_mask != AC_ERR_DEV) {
3272 ata_dev_printk(dev, KERN_WARNING,
3273 "failed to disable DIPM, Emask 0x%x\n",
3282 rc = ap->ops->set_lpm(link, policy, hints);
3283 if (!rc && ap->slave_link)
3284 rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
3286 rc = sata_pmp_set_lpm(link, policy, hints);
3289 * Attribute link config failure to the first (LPM) enabled
3290 * device on the link.
3293 if (rc == -EOPNOTSUPP) {
3294 link->flags |= ATA_LFLAG_NO_LPM;
3297 dev = lpm_dev ? lpm_dev : link_dev;
3301 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3302 ata_for_each_dev(dev, link, ENABLED) {
3303 if (policy == ATA_LPM_MIN_POWER && ata_id_has_dipm(dev->id)) {
3304 err_mask = ata_dev_set_feature(dev,
3305 SETFEATURES_SATA_ENABLE, SATA_DIPM);
3306 if (err_mask && err_mask != AC_ERR_DEV) {
3307 ata_dev_printk(dev, KERN_WARNING,
3308 "failed to enable DIPM, Emask 0x%x\n",
3316 link->lpm_policy = policy;
3317 if (ap && ap->slave_link)
3318 ap->slave_link->lpm_policy = policy;
3322 /* if no device or only one more chance is left, disable LPM */
3323 if (!dev || ehc->tries[dev->devno] <= 2) {
3324 ata_link_printk(link, KERN_WARNING,
3325 "disabling LPM on the link\n");
3326 link->flags |= ATA_LFLAG_NO_LPM;
3329 *r_failed_dev = dev;
3333 static int ata_link_nr_enabled(struct ata_link *link)
3335 struct ata_device *dev;
3338 ata_for_each_dev(dev, link, ENABLED)
3343 static int ata_link_nr_vacant(struct ata_link *link)
3345 struct ata_device *dev;
3348 ata_for_each_dev(dev, link, ALL)
3349 if (dev->class == ATA_DEV_UNKNOWN)
3354 static int ata_eh_skip_recovery(struct ata_link *link)
3356 struct ata_port *ap = link->ap;
3357 struct ata_eh_context *ehc = &link->eh_context;
3358 struct ata_device *dev;
3360 /* skip disabled links */
3361 if (link->flags & ATA_LFLAG_DISABLED)
3364 /* skip if explicitly requested */
3365 if (ehc->i.flags & ATA_EHI_NO_RECOVERY)
3368 /* thaw frozen port and recover failed devices */
3369 if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link))
3372 /* reset at least once if reset is requested */
3373 if ((ehc->i.action & ATA_EH_RESET) &&
3374 !(ehc->i.flags & ATA_EHI_DID_RESET))
3377 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
3378 ata_for_each_dev(dev, link, ALL) {
3379 if (dev->class == ATA_DEV_UNKNOWN &&
3380 ehc->classes[dev->devno] != ATA_DEV_NONE)
3387 static int ata_count_probe_trials_cb(struct ata_ering_entry *ent, void *void_arg)
3389 u64 interval = msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL);
3390 u64 now = get_jiffies_64();
3391 int *trials = void_arg;
3393 if (ent->timestamp < now - min(now, interval))
3400 static int ata_eh_schedule_probe(struct ata_device *dev)
3402 struct ata_eh_context *ehc = &dev->link->eh_context;
3403 struct ata_link *link = ata_dev_phys_link(dev);
3406 if (!(ehc->i.probe_mask & (1 << dev->devno)) ||
3407 (ehc->did_probe_mask & (1 << dev->devno)))
3410 ata_eh_detach_dev(dev);
3412 ehc->did_probe_mask |= (1 << dev->devno);
3413 ehc->i.action |= ATA_EH_RESET;
3414 ehc->saved_xfer_mode[dev->devno] = 0;
3415 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
3417 /* the link maybe in a deep sleep, wake it up */
3418 if (link->lpm_policy > ATA_LPM_MAX_POWER) {
3419 if (ata_is_host_link(link))
3420 link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER,
3423 sata_pmp_set_lpm(link, ATA_LPM_MAX_POWER,
3427 /* Record and count probe trials on the ering. The specific
3428 * error mask used is irrelevant. Because a successful device
3429 * detection clears the ering, this count accumulates only if
3430 * there are consecutive failed probes.
3432 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3433 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3434 * forced to 1.5Gbps.
3436 * This is to work around cases where failed link speed
3437 * negotiation results in device misdetection leading to
3438 * infinite DEVXCHG or PHRDY CHG events.
3440 ata_ering_record(&dev->ering, 0, AC_ERR_OTHER);
3441 ata_ering_map(&dev->ering, ata_count_probe_trials_cb, &trials);
3443 if (trials > ATA_EH_PROBE_TRIALS)
3444 sata_down_spd_limit(link, 1);
3449 static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
3451 struct ata_eh_context *ehc = &dev->link->eh_context;
3453 /* -EAGAIN from EH routine indicates retry without prejudice.
3454 * The requester is responsible for ensuring forward progress.
3457 ehc->tries[dev->devno]--;
3461 /* device missing or wrong IDENTIFY data, schedule probing */
3462 ehc->i.probe_mask |= (1 << dev->devno);
3464 /* give it just one more chance */
3465 ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
3467 if (ehc->tries[dev->devno] == 1) {
3468 /* This is the last chance, better to slow
3469 * down than lose it.
3471 sata_down_spd_limit(ata_dev_phys_link(dev), 0);
3472 if (dev->pio_mode > XFER_PIO_0)
3473 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
3477 if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
3478 /* disable device if it has used up all its chances */
3479 ata_dev_disable(dev);
3481 /* detach if offline */
3482 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
3483 ata_eh_detach_dev(dev);
3485 /* schedule probe if necessary */
3486 if (ata_eh_schedule_probe(dev)) {
3487 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
3488 memset(ehc->cmd_timeout_idx[dev->devno], 0,
3489 sizeof(ehc->cmd_timeout_idx[dev->devno]));
3494 ehc->i.action |= ATA_EH_RESET;
3500 * ata_eh_recover - recover host port after error
3501 * @ap: host port to recover
3502 * @prereset: prereset method (can be NULL)
3503 * @softreset: softreset method (can be NULL)
3504 * @hardreset: hardreset method (can be NULL)
3505 * @postreset: postreset method (can be NULL)
3506 * @r_failed_link: out parameter for failed link
3508 * This is the alpha and omega, eum and yang, heart and soul of
3509 * libata exception handling. On entry, actions required to
3510 * recover each link and hotplug requests are recorded in the
3511 * link's eh_context. This function executes all the operations
3512 * with appropriate retrials and fallbacks to resurrect failed
3513 * devices, detach goners and greet newcomers.
3516 * Kernel thread context (may sleep).
3519 * 0 on success, -errno on failure.
3521 int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
3522 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3523 ata_postreset_fn_t postreset,
3524 struct ata_link **r_failed_link)
3526 struct ata_link *link;
3527 struct ata_device *dev;
3529 unsigned long flags, deadline;
3533 /* prep for recovery */
3534 ata_for_each_link(link, ap, EDGE) {
3535 struct ata_eh_context *ehc = &link->eh_context;
3537 /* re-enable link? */
3538 if (ehc->i.action & ATA_EH_ENABLE_LINK) {
3539 ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK);
3540 spin_lock_irqsave(ap->lock, flags);
3541 link->flags &= ~ATA_LFLAG_DISABLED;
3542 spin_unlock_irqrestore(ap->lock, flags);
3543 ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK);
3546 ata_for_each_dev(dev, link, ALL) {
3547 if (link->flags & ATA_LFLAG_NO_RETRY)
3548 ehc->tries[dev->devno] = 1;
3550 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
3552 /* collect port action mask recorded in dev actions */
3553 ehc->i.action |= ehc->i.dev_action[dev->devno] &
3554 ~ATA_EH_PERDEV_MASK;
3555 ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK;
3557 /* process hotplug request */
3558 if (dev->flags & ATA_DFLAG_DETACH)
3559 ata_eh_detach_dev(dev);
3561 /* schedule probe if necessary */
3562 if (!ata_dev_enabled(dev))
3563 ata_eh_schedule_probe(dev);
3570 /* if UNLOADING, finish immediately */
3571 if (ap->pflags & ATA_PFLAG_UNLOADING)
3575 ata_for_each_link(link, ap, EDGE) {
3576 struct ata_eh_context *ehc = &link->eh_context;
3578 /* skip EH if possible. */
3579 if (ata_eh_skip_recovery(link))
3582 ata_for_each_dev(dev, link, ALL)
3583 ehc->classes[dev->devno] = ATA_DEV_UNKNOWN;
3587 ata_for_each_link(link, ap, EDGE) {
3588 struct ata_eh_context *ehc = &link->eh_context;
3590 if (!(ehc->i.action & ATA_EH_RESET))
3593 rc = ata_eh_reset(link, ata_link_nr_vacant(link),
3594 prereset, softreset, hardreset, postreset);
3596 ata_link_printk(link, KERN_ERR,
3597 "reset failed, giving up\n");
3606 * clears ATA_EH_PARK in eh_info and resets
3607 * ap->park_req_pending
3609 ata_eh_pull_park_action(ap);
3612 ata_for_each_link(link, ap, EDGE) {
3613 ata_for_each_dev(dev, link, ALL) {
3614 struct ata_eh_context *ehc = &link->eh_context;
3617 if (dev->class != ATA_DEV_ATA)
3619 if (!(ehc->i.dev_action[dev->devno] &
3622 tmp = dev->unpark_deadline;
3623 if (time_before(deadline, tmp))
3625 else if (time_before_eq(tmp, jiffies))
3627 if (ehc->unloaded_mask & (1 << dev->devno))
3630 ata_eh_park_issue_cmd(dev, 1);
3635 if (time_before_eq(deadline, now))
3638 deadline = wait_for_completion_timeout(&ap->park_req_pending,
3641 ata_for_each_link(link, ap, EDGE) {
3642 ata_for_each_dev(dev, link, ALL) {
3643 if (!(link->eh_context.unloaded_mask &
3647 ata_eh_park_issue_cmd(dev, 0);
3648 ata_eh_done(link, dev, ATA_EH_PARK);
3654 ata_for_each_link(link, ap, PMP_FIRST) {
3655 struct ata_eh_context *ehc = &link->eh_context;
3657 if (sata_pmp_attached(ap) && ata_is_host_link(link))
3660 /* revalidate existing devices and attach new ones */
3661 rc = ata_eh_revalidate_and_attach(link, &dev);
3665 /* if PMP got attached, return, pmp EH will take care of it */
3666 if (link->device->class == ATA_DEV_PMP) {
3671 /* configure transfer mode if necessary */
3672 if (ehc->i.flags & ATA_EHI_SETMODE) {
3673 rc = ata_set_mode(link, &dev);
3676 ehc->i.flags &= ~ATA_EHI_SETMODE;
3679 /* If reset has been issued, clear UA to avoid
3680 * disrupting the current users of the device.
3682 if (ehc->i.flags & ATA_EHI_DID_RESET) {
3683 ata_for_each_dev(dev, link, ALL) {
3684 if (dev->class != ATA_DEV_ATAPI)
3686 rc = atapi_eh_clear_ua(dev);
3692 /* retry flush if necessary */
3693 ata_for_each_dev(dev, link, ALL) {
3694 if (dev->class != ATA_DEV_ATA)
3696 rc = ata_eh_maybe_retry_flush(dev);
3702 /* configure link power saving */
3703 if (link->lpm_policy != ap->target_lpm_policy) {
3704 rc = ata_eh_set_lpm(link, ap->target_lpm_policy, &dev);
3709 /* this link is okay now */
3716 ata_eh_handle_dev_fail(dev, rc);
3718 if (ap->pflags & ATA_PFLAG_FROZEN) {
3719 /* PMP reset requires working host port.
3720 * Can't retry if it's frozen.
3722 if (sata_pmp_attached(ap))
3732 if (rc && r_failed_link)
3733 *r_failed_link = link;
3735 DPRINTK("EXIT, rc=%d\n", rc);
3740 * ata_eh_finish - finish up EH
3741 * @ap: host port to finish EH for
3743 * Recovery is complete. Clean up EH states and retry or finish
3749 void ata_eh_finish(struct ata_port *ap)
3753 /* retry or finish qcs */
3754 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
3755 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
3757 if (!(qc->flags & ATA_QCFLAG_FAILED))
3761 /* FIXME: Once EH migration is complete,
3762 * generate sense data in this function,
3763 * considering both err_mask and tf.
3765 if (qc->flags & ATA_QCFLAG_RETRY)
3766 ata_eh_qc_retry(qc);
3768 ata_eh_qc_complete(qc);
3770 if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
3771 ata_eh_qc_complete(qc);
3773 /* feed zero TF to sense generation */
3774 memset(&qc->result_tf, 0, sizeof(qc->result_tf));
3775 ata_eh_qc_retry(qc);
3780 /* make sure nr_active_links is zero after EH */
3781 WARN_ON(ap->nr_active_links);
3782 ap->nr_active_links = 0;
3786 * ata_do_eh - do standard error handling
3787 * @ap: host port to handle error for
3789 * @prereset: prereset method (can be NULL)
3790 * @softreset: softreset method (can be NULL)
3791 * @hardreset: hardreset method (can be NULL)
3792 * @postreset: postreset method (can be NULL)
3794 * Perform standard error handling sequence.
3797 * Kernel thread context (may sleep).
3799 void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
3800 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3801 ata_postreset_fn_t postreset)
3803 struct ata_device *dev;
3809 rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset,
3812 ata_for_each_dev(dev, &ap->link, ALL)
3813 ata_dev_disable(dev);
3820 * ata_std_error_handler - standard error handler
3821 * @ap: host port to handle error for
3823 * Standard error handler
3826 * Kernel thread context (may sleep).
3828 void ata_std_error_handler(struct ata_port *ap)
3830 struct ata_port_operations *ops = ap->ops;
3831 ata_reset_fn_t hardreset = ops->hardreset;
3833 /* ignore built-in hardreset if SCR access is not available */
3834 if (hardreset == sata_std_hardreset && !sata_scr_valid(&ap->link))
3837 ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
3842 * ata_eh_handle_port_suspend - perform port suspend operation
3843 * @ap: port to suspend
3848 * Kernel thread context (may sleep).
3850 static void ata_eh_handle_port_suspend(struct ata_port *ap)
3852 unsigned long flags;
3855 /* are we suspending? */
3856 spin_lock_irqsave(ap->lock, flags);
3857 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
3858 ap->pm_mesg.event == PM_EVENT_ON) {
3859 spin_unlock_irqrestore(ap->lock, flags);
3862 spin_unlock_irqrestore(ap->lock, flags);
3864 WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
3866 /* tell ACPI we're suspending */
3867 rc = ata_acpi_on_suspend(ap);
3872 ata_eh_freeze_port(ap);
3874 if (ap->ops->port_suspend)
3875 rc = ap->ops->port_suspend(ap, ap->pm_mesg);
3877 ata_acpi_set_state(ap, PMSG_SUSPEND);
3880 spin_lock_irqsave(ap->lock, flags);
3882 ap->pflags &= ~ATA_PFLAG_PM_PENDING;
3884 ap->pflags |= ATA_PFLAG_SUSPENDED;
3885 else if (ap->pflags & ATA_PFLAG_FROZEN)
3886 ata_port_schedule_eh(ap);
3888 if (ap->pm_result) {
3889 *ap->pm_result = rc;
3890 ap->pm_result = NULL;
3893 spin_unlock_irqrestore(ap->lock, flags);
3899 * ata_eh_handle_port_resume - perform port resume operation
3900 * @ap: port to resume
3905 * Kernel thread context (may sleep).
3907 static void ata_eh_handle_port_resume(struct ata_port *ap)
3909 struct ata_link *link;
3910 struct ata_device *dev;
3911 unsigned long flags;
3914 /* are we resuming? */
3915 spin_lock_irqsave(ap->lock, flags);
3916 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
3917 ap->pm_mesg.event != PM_EVENT_ON) {
3918 spin_unlock_irqrestore(ap->lock, flags);
3921 spin_unlock_irqrestore(ap->lock, flags);
3923 WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
3926 * Error timestamps are in jiffies which doesn't run while
3927 * suspended and PHY events during resume isn't too uncommon.
3928 * When the two are combined, it can lead to unnecessary speed
3929 * downs if the machine is suspended and resumed repeatedly.
3930 * Clear error history.
3932 ata_for_each_link(link, ap, HOST_FIRST)
3933 ata_for_each_dev(dev, link, ALL)
3934 ata_ering_clear(&dev->ering);
3936 ata_acpi_set_state(ap, PMSG_ON);
3938 if (ap->ops->port_resume)
3939 rc = ap->ops->port_resume(ap);
3941 /* tell ACPI that we're resuming */
3942 ata_acpi_on_resume(ap);
3945 spin_lock_irqsave(ap->lock, flags);
3946 ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
3947 if (ap->pm_result) {
3948 *ap->pm_result = rc;
3949 ap->pm_result = NULL;
3951 spin_unlock_irqrestore(ap->lock, flags);
3953 #endif /* CONFIG_PM */