ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / drivers / ata / libata-eh.c
blob311c92d1db251e08a44a2587e90bda9a49bcd770
1 /*
2 * libata-eh.c - libata error handling
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
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,
24 * USA.
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>
48 #include "libata.h"
50 enum {
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),
57 /* error flags */
58 ATA_EFLAG_IS_IO = (1 << 0),
59 ATA_EFLAG_DUBIOUS_XFER = (1 << 1),
60 ATA_EFLAG_OLD_ER = (1 << 31),
62 /* error categories */
63 ATA_ECAT_NONE = 0,
64 ATA_ECAT_ATA_BUS = 1,
65 ATA_ECAT_TOUT_HSM = 2,
66 ATA_ECAT_UNK_DEV = 3,
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,
71 ATA_ECAT_NR = 8,
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,
86 ATA_EH_UA_TRIES = 5,
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 */
111 ULONG_MAX,
114 static const unsigned long ata_eh_flush_timeouts[] = {
115 15000, /* be generous with flush */
116 15000, /* ditto */
117 30000, /* and even more generous */
118 ULONG_MAX,
121 static const unsigned long ata_eh_other_timeouts[] = {
122 5000, /* same rationale as identify timeout */
123 10000, /* ditto */
124 /* but no merciful 30sec for other commands, it just isn't worth it */
125 ULONG_MAX,
128 struct ata_eh_cmd_timeout_ent {
129 const u8 *commands;
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 },
161 #undef CMDS
163 static void __ata_port_freeze(struct ata_port *ap);
164 #ifdef CONFIG_PM
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,
176 va_list args)
178 ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len,
179 ATA_EH_DESC_LEN - ehi->desc_len,
180 fmt, args);
184 * __ata_ehi_push_desc - push error description without adding separator
185 * @ehi: target EHI
186 * @fmt: printf format string
188 * Format string according to @fmt and append it to @ehi->desc.
190 * LOCKING:
191 * spin_lock_irqsave(host lock)
193 void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
195 va_list args;
197 va_start(args, fmt);
198 __ata_ehi_pushv_desc(ehi, fmt, args);
199 va_end(args);
203 * ata_ehi_push_desc - push error description with separator
204 * @ehi: target EHI
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.
210 * LOCKING:
211 * spin_lock_irqsave(host lock)
213 void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
215 va_list args;
217 if (ehi->desc_len)
218 __ata_ehi_push_desc(ehi, ", ");
220 va_start(args, fmt);
221 __ata_ehi_pushv_desc(ehi, fmt, args);
222 va_end(args);
226 * ata_ehi_clear_desc - clean error description
227 * @ehi: target EHI
229 * Clear @ehi->desc.
231 * LOCKING:
232 * spin_lock_irqsave(host lock)
234 void ata_ehi_clear_desc(struct ata_eh_info *ehi)
236 ehi->desc[0] = '\0';
237 ehi->desc_len = 0;
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.
250 * LOCKING:
251 * None.
253 void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
255 va_list args;
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, " ");
262 va_start(args, fmt);
263 __ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
264 va_end(args);
267 #ifdef CONFIG_PCI
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.
281 * LOCKING:
282 * None.
284 void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
285 const char *name)
287 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
288 char *type = "";
289 unsigned long long start, len;
291 if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
292 type = "m";
293 else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
294 type = "i";
296 start = (unsigned long long)pci_resource_start(pdev, bar);
297 len = (unsigned long long)pci_resource_len(pdev, bar);
299 if (offset < 0)
300 ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start);
301 else
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)
310 int i;
312 for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
313 const u8 *cur;
315 for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
316 if (*cur == cmd)
317 return i;
320 return -1;
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.
330 * LOCKING:
331 * EH context.
333 * RETURNS:
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);
340 int idx;
342 if (ent < 0)
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().
358 * LOCKING:
359 * EH context.
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);
365 int idx;
367 if (ent < 0)
368 return;
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;
380 WARN_ON(!err_mask);
382 ering->cursor++;
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];
395 if (ent->err_mask)
396 return ent;
397 return NULL;
400 int ata_ering_map(struct ata_ering *ering,
401 int (*map_fn)(struct ata_ering_entry *, void *),
402 void *arg)
404 int idx, rc = 0;
405 struct ata_ering_entry *ent;
407 idx = ering->cursor;
408 do {
409 ent = &ering->ring[idx];
410 if (!ent->err_mask)
411 break;
412 rc = map_fn(ent, arg);
413 if (rc)
414 break;
415 idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
416 } while (idx != ering->cursor);
418 return rc;
421 int ata_ering_clear_cb(struct ata_ering_entry *ent, void *void_arg)
423 ent->eflags |= ATA_EFLAG_OLD_ER;
424 return 0;
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;
444 if (!dev) {
445 ehi->action &= ~action;
446 ata_for_each_dev(tdev, link, ALL)
447 ehi->dev_action[tdev->devno] &= ~action;
448 } else {
449 /* doesn't make sense for port-wide EH actions */
450 WARN_ON(!(action & ATA_EH_PERDEV_MASK));
452 /* break ehi->action into ehi->dev_action */
453 if (ehi->action & action) {
454 ata_for_each_dev(tdev, link, ALL)
455 ehi->dev_action[tdev->devno] |=
456 ehi->action & action;
457 ehi->action &= ~action;
460 /* turn off the specified per-dev action */
461 ehi->dev_action[dev->devno] &= ~action;
466 * ata_eh_acquire - acquire EH ownership
467 * @ap: ATA port to acquire EH ownership for
469 * Acquire EH ownership for @ap. This is the basic exclusion
470 * mechanism for ports sharing a host. Only one port hanging off
471 * the same host can claim the ownership of EH.
473 * LOCKING:
474 * EH context.
476 void ata_eh_acquire(struct ata_port *ap)
478 mutex_lock(&ap->host->eh_mutex);
479 WARN_ON_ONCE(ap->host->eh_owner);
480 ap->host->eh_owner = current;
484 * ata_eh_release - release EH ownership
485 * @ap: ATA port to release EH ownership for
487 * Release EH ownership for @ap if the caller. The caller must
488 * have acquired EH ownership using ata_eh_acquire() previously.
490 * LOCKING:
491 * EH context.
493 void ata_eh_release(struct ata_port *ap)
495 WARN_ON_ONCE(ap->host->eh_owner != current);
496 ap->host->eh_owner = NULL;
497 mutex_unlock(&ap->host->eh_mutex);
501 * ata_scsi_timed_out - SCSI layer time out callback
502 * @cmd: timed out SCSI command
504 * Handles SCSI layer timeout. We race with normal completion of
505 * the qc for @cmd. If the qc is already gone, we lose and let
506 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
507 * timed out and EH should be invoked. Prevent ata_qc_complete()
508 * from finishing it by setting EH_SCHEDULED and return
509 * EH_NOT_HANDLED.
511 * TODO: kill this function once old EH is gone.
513 * LOCKING:
514 * Called from timer context
516 * RETURNS:
517 * EH_HANDLED or EH_NOT_HANDLED
519 enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
521 struct Scsi_Host *host = cmd->device->host;
522 struct ata_port *ap = ata_shost_to_port(host);
523 unsigned long flags;
524 struct ata_queued_cmd *qc;
525 enum blk_eh_timer_return ret;
527 DPRINTK("ENTER\n");
529 if (ap->ops->error_handler) {
530 ret = BLK_EH_NOT_HANDLED;
531 goto out;
534 ret = BLK_EH_HANDLED;
535 spin_lock_irqsave(ap->lock, flags);
536 qc = ata_qc_from_tag(ap, ap->link.active_tag);
537 if (qc) {
538 WARN_ON(qc->scsicmd != cmd);
539 qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
540 qc->err_mask |= AC_ERR_TIMEOUT;
541 ret = BLK_EH_NOT_HANDLED;
543 spin_unlock_irqrestore(ap->lock, flags);
545 out:
546 DPRINTK("EXIT, ret=%d\n", ret);
547 return ret;
550 static void ata_eh_unload(struct ata_port *ap)
552 struct ata_link *link;
553 struct ata_device *dev;
554 unsigned long flags;
556 /* Restore SControl IPM and SPD for the next driver and
557 * disable attached devices.
559 ata_for_each_link(link, ap, PMP_FIRST) {
560 sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
561 ata_for_each_dev(dev, link, ALL)
562 ata_dev_disable(dev);
565 /* freeze and set UNLOADED */
566 spin_lock_irqsave(ap->lock, flags);
568 ata_port_freeze(ap); /* won't be thawed */
569 ap->pflags &= ~ATA_PFLAG_EH_PENDING; /* clear pending from freeze */
570 ap->pflags |= ATA_PFLAG_UNLOADED;
572 spin_unlock_irqrestore(ap->lock, flags);
576 * ata_scsi_error - SCSI layer error handler callback
577 * @host: SCSI host on which error occurred
579 * Handles SCSI-layer-thrown error events.
581 * LOCKING:
582 * Inherited from SCSI layer (none, can sleep)
584 * RETURNS:
585 * Zero.
587 void ata_scsi_error(struct Scsi_Host *host)
589 struct ata_port *ap = ata_shost_to_port(host);
590 unsigned long flags;
591 LIST_HEAD(eh_work_q);
593 DPRINTK("ENTER\n");
595 spin_lock_irqsave(host->host_lock, flags);
596 list_splice_init(&host->eh_cmd_q, &eh_work_q);
597 spin_unlock_irqrestore(host->host_lock, flags);
599 ata_scsi_cmd_error_handler(host, ap, &eh_work_q);
601 /* If we timed raced normal completion and there is nothing to
602 recover nr_timedout == 0 why exactly are we doing error recovery ? */
603 ata_scsi_port_error_handler(host, ap);
605 /* finish or retry handled scmd's and clean up */
606 WARN_ON(host->host_failed || !list_empty(&eh_work_q));
608 DPRINTK("EXIT\n");
612 * ata_scsi_cmd_error_handler - error callback for a list of commands
613 * @host: scsi host containing the port
614 * @ap: ATA port within the host
615 * @eh_work_q: list of commands to process
617 * process the given list of commands and return those finished to the
618 * ap->eh_done_q. This function is the first part of the libata error
619 * handler which processes a given list of failed commands.
621 void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap,
622 struct list_head *eh_work_q)
624 int i;
625 unsigned long flags;
627 /* make sure sff pio task is not running */
628 ata_sff_flush_pio_task(ap);
630 /* synchronize with host lock and sort out timeouts */
632 /* For new EH, all qcs are finished in one of three ways -
633 * normal completion, error completion, and SCSI timeout.
634 * Both completions can race against SCSI timeout. When normal
635 * completion wins, the qc never reaches EH. When error
636 * completion wins, the qc has ATA_QCFLAG_FAILED set.
638 * When SCSI timeout wins, things are a bit more complex.
639 * Normal or error completion can occur after the timeout but
640 * before this point. In such cases, both types of
641 * completions are honored. A scmd is determined to have
642 * timed out iff its associated qc is active and not failed.
644 if (ap->ops->error_handler) {
645 struct scsi_cmnd *scmd, *tmp;
646 int nr_timedout = 0;
648 spin_lock_irqsave(ap->lock, flags);
650 /* This must occur under the ap->lock as we don't want
651 a polled recovery to race the real interrupt handler
653 The lost_interrupt handler checks for any completed but
654 non-notified command and completes much like an IRQ handler.
656 We then fall into the error recovery code which will treat
657 this as if normal completion won the race */
659 if (ap->ops->lost_interrupt)
660 ap->ops->lost_interrupt(ap);
662 list_for_each_entry_safe(scmd, tmp, eh_work_q, eh_entry) {
663 struct ata_queued_cmd *qc;
665 for (i = 0; i < ATA_MAX_QUEUE; i++) {
666 qc = __ata_qc_from_tag(ap, i);
667 if (qc->flags & ATA_QCFLAG_ACTIVE &&
668 qc->scsicmd == scmd)
669 break;
672 if (i < ATA_MAX_QUEUE) {
673 /* the scmd has an associated qc */
674 if (!(qc->flags & ATA_QCFLAG_FAILED)) {
675 /* which hasn't failed yet, timeout */
676 qc->err_mask |= AC_ERR_TIMEOUT;
677 qc->flags |= ATA_QCFLAG_FAILED;
678 nr_timedout++;
680 } else {
681 /* Normal completion occurred after
682 * SCSI timeout but before this point.
683 * Successfully complete it.
685 scmd->retries = scmd->allowed;
686 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
690 /* If we have timed out qcs. They belong to EH from
691 * this point but the state of the controller is
692 * unknown. Freeze the port to make sure the IRQ
693 * handler doesn't diddle with those qcs. This must
694 * be done atomically w.r.t. setting QCFLAG_FAILED.
696 if (nr_timedout)
697 __ata_port_freeze(ap);
699 spin_unlock_irqrestore(ap->lock, flags);
701 /* initialize eh_tries */
702 ap->eh_tries = ATA_EH_MAX_TRIES;
703 } else
704 spin_unlock_wait(ap->lock);
707 EXPORT_SYMBOL(ata_scsi_cmd_error_handler);
710 * ata_scsi_port_error_handler - recover the port after the commands
711 * @host: SCSI host containing the port
712 * @ap: the ATA port
714 * Handle the recovery of the port @ap after all the commands
715 * have been recovered.
717 void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap)
719 unsigned long flags;
721 /* invoke error handler */
722 if (ap->ops->error_handler) {
723 struct ata_link *link;
725 /* acquire EH ownership */
726 ata_eh_acquire(ap);
727 repeat:
728 /* kill fast drain timer */
729 del_timer_sync(&ap->fastdrain_timer);
731 /* process port resume request */
732 ata_eh_handle_port_resume(ap);
734 /* fetch & clear EH info */
735 spin_lock_irqsave(ap->lock, flags);
737 ata_for_each_link(link, ap, HOST_FIRST) {
738 struct ata_eh_context *ehc = &link->eh_context;
739 struct ata_device *dev;
741 memset(&link->eh_context, 0, sizeof(link->eh_context));
742 link->eh_context.i = link->eh_info;
743 memset(&link->eh_info, 0, sizeof(link->eh_info));
745 ata_for_each_dev(dev, link, ENABLED) {
746 int devno = dev->devno;
748 ehc->saved_xfer_mode[devno] = dev->xfer_mode;
749 if (ata_ncq_enabled(dev))
750 ehc->saved_ncq_enabled |= 1 << devno;
754 ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
755 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
756 ap->excl_link = NULL; /* don't maintain exclusion over EH */
758 spin_unlock_irqrestore(ap->lock, flags);
760 /* invoke EH, skip if unloading or suspended */
761 if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
762 ap->ops->error_handler(ap);
763 else {
764 /* if unloading, commence suicide */
765 if ((ap->pflags & ATA_PFLAG_UNLOADING) &&
766 !(ap->pflags & ATA_PFLAG_UNLOADED))
767 ata_eh_unload(ap);
768 ata_eh_finish(ap);
771 /* process port suspend request */
772 ata_eh_handle_port_suspend(ap);
774 /* Exception might have happened after ->error_handler
775 * recovered the port but before this point. Repeat
776 * EH in such case.
778 spin_lock_irqsave(ap->lock, flags);
780 if (ap->pflags & ATA_PFLAG_EH_PENDING) {
781 if (--ap->eh_tries) {
782 spin_unlock_irqrestore(ap->lock, flags);
783 goto repeat;
785 ata_port_printk(ap, KERN_ERR, "EH pending after %d "
786 "tries, giving up\n", ATA_EH_MAX_TRIES);
787 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
790 /* this run is complete, make sure EH info is clear */
791 ata_for_each_link(link, ap, HOST_FIRST)
792 memset(&link->eh_info, 0, sizeof(link->eh_info));
794 /* Clear host_eh_scheduled while holding ap->lock such
795 * that if exception occurs after this point but
796 * before EH completion, SCSI midlayer will
797 * re-initiate EH.
799 host->host_eh_scheduled = 0;
801 spin_unlock_irqrestore(ap->lock, flags);
802 ata_eh_release(ap);
803 } else {
804 WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
805 ap->ops->eng_timeout(ap);
808 scsi_eh_flush_done_q(&ap->eh_done_q);
810 /* clean up */
811 spin_lock_irqsave(ap->lock, flags);
813 if (ap->pflags & ATA_PFLAG_LOADING)
814 ap->pflags &= ~ATA_PFLAG_LOADING;
815 else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
816 schedule_delayed_work(&ap->hotplug_task, 0);
818 if (ap->pflags & ATA_PFLAG_RECOVERED)
819 ata_port_printk(ap, KERN_INFO, "EH complete\n");
821 ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
823 /* tell wait_eh that we're done */
824 ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
825 wake_up_all(&ap->eh_wait_q);
827 spin_unlock_irqrestore(ap->lock, flags);
829 EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler);
832 * ata_port_wait_eh - Wait for the currently pending EH to complete
833 * @ap: Port to wait EH for
835 * Wait until the currently pending EH is complete.
837 * LOCKING:
838 * Kernel thread context (may sleep).
840 void ata_port_wait_eh(struct ata_port *ap)
842 unsigned long flags;
843 DEFINE_WAIT(wait);
845 retry:
846 spin_lock_irqsave(ap->lock, flags);
848 while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
849 prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
850 spin_unlock_irqrestore(ap->lock, flags);
851 schedule();
852 spin_lock_irqsave(ap->lock, flags);
854 finish_wait(&ap->eh_wait_q, &wait);
856 spin_unlock_irqrestore(ap->lock, flags);
858 /* make sure SCSI EH is complete */
859 if (scsi_host_in_recovery(ap->scsi_host)) {
860 ata_msleep(ap, 10);
861 goto retry;
865 static int ata_eh_nr_in_flight(struct ata_port *ap)
867 unsigned int tag;
868 int nr = 0;
870 /* count only non-internal commands */
871 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++)
872 if (ata_qc_from_tag(ap, tag))
873 nr++;
875 return nr;
878 void ata_eh_fastdrain_timerfn(unsigned long arg)
880 struct ata_port *ap = (void *)arg;
881 unsigned long flags;
882 int cnt;
884 spin_lock_irqsave(ap->lock, flags);
886 cnt = ata_eh_nr_in_flight(ap);
888 /* are we done? */
889 if (!cnt)
890 goto out_unlock;
892 if (cnt == ap->fastdrain_cnt) {
893 unsigned int tag;
895 /* No progress during the last interval, tag all
896 * in-flight qcs as timed out and freeze the port.
898 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) {
899 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
900 if (qc)
901 qc->err_mask |= AC_ERR_TIMEOUT;
904 ata_port_freeze(ap);
905 } else {
906 /* some qcs have finished, give it another chance */
907 ap->fastdrain_cnt = cnt;
908 ap->fastdrain_timer.expires =
909 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
910 add_timer(&ap->fastdrain_timer);
913 out_unlock:
914 spin_unlock_irqrestore(ap->lock, flags);
918 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
919 * @ap: target ATA port
920 * @fastdrain: activate fast drain
922 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
923 * is non-zero and EH wasn't pending before. Fast drain ensures
924 * that EH kicks in in timely manner.
926 * LOCKING:
927 * spin_lock_irqsave(host lock)
929 static void ata_eh_set_pending(struct ata_port *ap, int fastdrain)
931 int cnt;
933 /* already scheduled? */
934 if (ap->pflags & ATA_PFLAG_EH_PENDING)
935 return;
937 ap->pflags |= ATA_PFLAG_EH_PENDING;
939 if (!fastdrain)
940 return;
942 /* do we have in-flight qcs? */
943 cnt = ata_eh_nr_in_flight(ap);
944 if (!cnt)
945 return;
947 /* activate fast drain */
948 ap->fastdrain_cnt = cnt;
949 ap->fastdrain_timer.expires =
950 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
951 add_timer(&ap->fastdrain_timer);
955 * ata_qc_schedule_eh - schedule qc for error handling
956 * @qc: command to schedule error handling for
958 * Schedule error handling for @qc. EH will kick in as soon as
959 * other commands are drained.
961 * LOCKING:
962 * spin_lock_irqsave(host lock)
964 void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
966 struct ata_port *ap = qc->ap;
967 struct request_queue *q = qc->scsicmd->device->request_queue;
968 unsigned long flags;
970 WARN_ON(!ap->ops->error_handler);
972 qc->flags |= ATA_QCFLAG_FAILED;
973 ata_eh_set_pending(ap, 1);
975 /* The following will fail if timeout has already expired.
976 * ata_scsi_error() takes care of such scmds on EH entry.
977 * Note that ATA_QCFLAG_FAILED is unconditionally set after
978 * this function completes.
980 spin_lock_irqsave(q->queue_lock, flags);
981 blk_abort_request(qc->scsicmd->request);
982 spin_unlock_irqrestore(q->queue_lock, flags);
986 * ata_port_schedule_eh - schedule error handling without a qc
987 * @ap: ATA port to schedule EH for
989 * Schedule error handling for @ap. EH will kick in as soon as
990 * all commands are drained.
992 * LOCKING:
993 * spin_lock_irqsave(host lock)
995 void ata_port_schedule_eh(struct ata_port *ap)
997 WARN_ON(!ap->ops->error_handler);
999 if (ap->pflags & ATA_PFLAG_INITIALIZING)
1000 return;
1002 ata_eh_set_pending(ap, 1);
1003 scsi_schedule_eh(ap->scsi_host);
1005 DPRINTK("port EH scheduled\n");
1008 static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
1010 int tag, nr_aborted = 0;
1012 WARN_ON(!ap->ops->error_handler);
1014 /* we're gonna abort all commands, no need for fast drain */
1015 ata_eh_set_pending(ap, 0);
1017 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1018 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
1020 if (qc && (!link || qc->dev->link == link)) {
1021 qc->flags |= ATA_QCFLAG_FAILED;
1022 ata_qc_complete(qc);
1023 nr_aborted++;
1027 if (!nr_aborted)
1028 ata_port_schedule_eh(ap);
1030 return nr_aborted;
1034 * ata_link_abort - abort all qc's on the link
1035 * @link: ATA link to abort qc's for
1037 * Abort all active qc's active on @link and schedule EH.
1039 * LOCKING:
1040 * spin_lock_irqsave(host lock)
1042 * RETURNS:
1043 * Number of aborted qc's.
1045 int ata_link_abort(struct ata_link *link)
1047 return ata_do_link_abort(link->ap, link);
1051 * ata_port_abort - abort all qc's on the port
1052 * @ap: ATA port to abort qc's for
1054 * Abort all active qc's of @ap and schedule EH.
1056 * LOCKING:
1057 * spin_lock_irqsave(host_set lock)
1059 * RETURNS:
1060 * Number of aborted qc's.
1062 int ata_port_abort(struct ata_port *ap)
1064 return ata_do_link_abort(ap, NULL);
1068 * __ata_port_freeze - freeze port
1069 * @ap: ATA port to freeze
1071 * This function is called when HSM violation or some other
1072 * condition disrupts normal operation of the port. Frozen port
1073 * is not allowed to perform any operation until the port is
1074 * thawed, which usually follows a successful reset.
1076 * ap->ops->freeze() callback can be used for freezing the port
1077 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1078 * port cannot be frozen hardware-wise, the interrupt handler
1079 * must ack and clear interrupts unconditionally while the port
1080 * is frozen.
1082 * LOCKING:
1083 * spin_lock_irqsave(host lock)
1085 static void __ata_port_freeze(struct ata_port *ap)
1087 WARN_ON(!ap->ops->error_handler);
1089 if (ap->ops->freeze)
1090 ap->ops->freeze(ap);
1092 ap->pflags |= ATA_PFLAG_FROZEN;
1094 DPRINTK("ata%u port frozen\n", ap->print_id);
1098 * ata_port_freeze - abort & freeze port
1099 * @ap: ATA port to freeze
1101 * Abort and freeze @ap. The freeze operation must be called
1102 * first, because some hardware requires special operations
1103 * before the taskfile registers are accessible.
1105 * LOCKING:
1106 * spin_lock_irqsave(host lock)
1108 * RETURNS:
1109 * Number of aborted commands.
1111 int ata_port_freeze(struct ata_port *ap)
1113 int nr_aborted;
1115 WARN_ON(!ap->ops->error_handler);
1117 __ata_port_freeze(ap);
1118 nr_aborted = ata_port_abort(ap);
1120 return nr_aborted;
1124 * sata_async_notification - SATA async notification handler
1125 * @ap: ATA port where async notification is received
1127 * Handler to be called when async notification via SDB FIS is
1128 * received. This function schedules EH if necessary.
1130 * LOCKING:
1131 * spin_lock_irqsave(host lock)
1133 * RETURNS:
1134 * 1 if EH is scheduled, 0 otherwise.
1136 int sata_async_notification(struct ata_port *ap)
1138 u32 sntf;
1139 int rc;
1141 if (!(ap->flags & ATA_FLAG_AN))
1142 return 0;
1144 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1145 if (rc == 0)
1146 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1148 if (!sata_pmp_attached(ap) || rc) {
1149 /* PMP is not attached or SNTF is not available */
1150 if (!sata_pmp_attached(ap)) {
1151 /* PMP is not attached. Check whether ATAPI
1152 * AN is configured. If so, notify media
1153 * change.
1155 struct ata_device *dev = ap->link.device;
1157 if ((dev->class == ATA_DEV_ATAPI) &&
1158 (dev->flags & ATA_DFLAG_AN))
1159 ata_scsi_media_change_notify(dev);
1160 return 0;
1161 } else {
1162 /* PMP is attached but SNTF is not available.
1163 * ATAPI async media change notification is
1164 * not used. The PMP must be reporting PHY
1165 * status change, schedule EH.
1167 ata_port_schedule_eh(ap);
1168 return 1;
1170 } else {
1171 /* PMP is attached and SNTF is available */
1172 struct ata_link *link;
1174 /* check and notify ATAPI AN */
1175 ata_for_each_link(link, ap, EDGE) {
1176 if (!(sntf & (1 << link->pmp)))
1177 continue;
1179 if ((link->device->class == ATA_DEV_ATAPI) &&
1180 (link->device->flags & ATA_DFLAG_AN))
1181 ata_scsi_media_change_notify(link->device);
1184 /* If PMP is reporting that PHY status of some
1185 * downstream ports has changed, schedule EH.
1187 if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
1188 ata_port_schedule_eh(ap);
1189 return 1;
1192 return 0;
1197 * ata_eh_freeze_port - EH helper to freeze port
1198 * @ap: ATA port to freeze
1200 * Freeze @ap.
1202 * LOCKING:
1203 * None.
1205 void ata_eh_freeze_port(struct ata_port *ap)
1207 unsigned long flags;
1209 if (!ap->ops->error_handler)
1210 return;
1212 spin_lock_irqsave(ap->lock, flags);
1213 __ata_port_freeze(ap);
1214 spin_unlock_irqrestore(ap->lock, flags);
1218 * ata_port_thaw_port - EH helper to thaw port
1219 * @ap: ATA port to thaw
1221 * Thaw frozen port @ap.
1223 * LOCKING:
1224 * None.
1226 void ata_eh_thaw_port(struct ata_port *ap)
1228 unsigned long flags;
1230 if (!ap->ops->error_handler)
1231 return;
1233 spin_lock_irqsave(ap->lock, flags);
1235 ap->pflags &= ~ATA_PFLAG_FROZEN;
1237 if (ap->ops->thaw)
1238 ap->ops->thaw(ap);
1240 spin_unlock_irqrestore(ap->lock, flags);
1242 DPRINTK("ata%u port thawed\n", ap->print_id);
1245 static void ata_eh_scsidone(struct scsi_cmnd *scmd)
1247 /* nada */
1250 static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
1252 struct ata_port *ap = qc->ap;
1253 struct scsi_cmnd *scmd = qc->scsicmd;
1254 unsigned long flags;
1256 spin_lock_irqsave(ap->lock, flags);
1257 qc->scsidone = ata_eh_scsidone;
1258 __ata_qc_complete(qc);
1259 WARN_ON(ata_tag_valid(qc->tag));
1260 spin_unlock_irqrestore(ap->lock, flags);
1262 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
1266 * ata_eh_qc_complete - Complete an active ATA command from EH
1267 * @qc: Command to complete
1269 * Indicate to the mid and upper layers that an ATA command has
1270 * completed. To be used from EH.
1272 void ata_eh_qc_complete(struct ata_queued_cmd *qc)
1274 struct scsi_cmnd *scmd = qc->scsicmd;
1275 scmd->retries = scmd->allowed;
1276 __ata_eh_qc_complete(qc);
1280 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1281 * @qc: Command to retry
1283 * Indicate to the mid and upper layers that an ATA command
1284 * should be retried. To be used from EH.
1286 * SCSI midlayer limits the number of retries to scmd->allowed.
1287 * scmd->retries is decremented for commands which get retried
1288 * due to unrelated failures (qc->err_mask is zero).
1290 void ata_eh_qc_retry(struct ata_queued_cmd *qc)
1292 struct scsi_cmnd *scmd = qc->scsicmd;
1293 if (!qc->err_mask && scmd->retries)
1294 scmd->retries--;
1295 __ata_eh_qc_complete(qc);
1299 * ata_dev_disable - disable ATA device
1300 * @dev: ATA device to disable
1302 * Disable @dev.
1304 * Locking:
1305 * EH context.
1307 void ata_dev_disable(struct ata_device *dev)
1309 if (!ata_dev_enabled(dev))
1310 return;
1312 if (ata_msg_drv(dev->link->ap))
1313 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
1314 ata_acpi_on_disable(dev);
1315 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
1316 dev->class++;
1318 /* From now till the next successful probe, ering is used to
1319 * track probe failures. Clear accumulated device error info.
1321 ata_ering_clear(&dev->ering);
1325 * ata_eh_detach_dev - detach ATA device
1326 * @dev: ATA device to detach
1328 * Detach @dev.
1330 * LOCKING:
1331 * None.
1333 void ata_eh_detach_dev(struct ata_device *dev)
1335 struct ata_link *link = dev->link;
1336 struct ata_port *ap = link->ap;
1337 struct ata_eh_context *ehc = &link->eh_context;
1338 unsigned long flags;
1340 ata_dev_disable(dev);
1342 spin_lock_irqsave(ap->lock, flags);
1344 dev->flags &= ~ATA_DFLAG_DETACH;
1346 if (ata_scsi_offline_dev(dev)) {
1347 dev->flags |= ATA_DFLAG_DETACHED;
1348 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
1351 /* clear per-dev EH info */
1352 ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK);
1353 ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK);
1354 ehc->saved_xfer_mode[dev->devno] = 0;
1355 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
1357 spin_unlock_irqrestore(ap->lock, flags);
1361 * ata_eh_about_to_do - about to perform eh_action
1362 * @link: target ATA link
1363 * @dev: target ATA dev for per-dev action (can be NULL)
1364 * @action: action about to be performed
1366 * Called just before performing EH actions to clear related bits
1367 * in @link->eh_info such that eh actions are not unnecessarily
1368 * repeated.
1370 * LOCKING:
1371 * None.
1373 void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
1374 unsigned int action)
1376 struct ata_port *ap = link->ap;
1377 struct ata_eh_info *ehi = &link->eh_info;
1378 struct ata_eh_context *ehc = &link->eh_context;
1379 unsigned long flags;
1381 spin_lock_irqsave(ap->lock, flags);
1383 ata_eh_clear_action(link, dev, ehi, action);
1385 /* About to take EH action, set RECOVERED. Ignore actions on
1386 * slave links as master will do them again.
1388 if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link)
1389 ap->pflags |= ATA_PFLAG_RECOVERED;
1391 spin_unlock_irqrestore(ap->lock, flags);
1395 * ata_eh_done - EH action complete
1396 * @ap: target ATA port
1397 * @dev: target ATA dev for per-dev action (can be NULL)
1398 * @action: action just completed
1400 * Called right after performing EH actions to clear related bits
1401 * in @link->eh_context.
1403 * LOCKING:
1404 * None.
1406 void ata_eh_done(struct ata_link *link, struct ata_device *dev,
1407 unsigned int action)
1409 struct ata_eh_context *ehc = &link->eh_context;
1411 ata_eh_clear_action(link, dev, &ehc->i, action);
1415 * ata_err_string - convert err_mask to descriptive string
1416 * @err_mask: error mask to convert to string
1418 * Convert @err_mask to descriptive string. Errors are
1419 * prioritized according to severity and only the most severe
1420 * error is reported.
1422 * LOCKING:
1423 * None.
1425 * RETURNS:
1426 * Descriptive string for @err_mask
1428 static const char *ata_err_string(unsigned int err_mask)
1430 if (err_mask & AC_ERR_HOST_BUS)
1431 return "host bus error";
1432 if (err_mask & AC_ERR_ATA_BUS)
1433 return "ATA bus error";
1434 if (err_mask & AC_ERR_TIMEOUT)
1435 return "timeout";
1436 if (err_mask & AC_ERR_HSM)
1437 return "HSM violation";
1438 if (err_mask & AC_ERR_SYSTEM)
1439 return "internal error";
1440 if (err_mask & AC_ERR_MEDIA)
1441 return "media error";
1442 if (err_mask & AC_ERR_INVALID)
1443 return "invalid argument";
1444 if (err_mask & AC_ERR_DEV)
1445 return "device error";
1446 return "unknown error";
1450 * ata_read_log_page - read a specific log page
1451 * @dev: target device
1452 * @page: page to read
1453 * @buf: buffer to store read page
1454 * @sectors: number of sectors to read
1456 * Read log page using READ_LOG_EXT command.
1458 * LOCKING:
1459 * Kernel thread context (may sleep).
1461 * RETURNS:
1462 * 0 on success, AC_ERR_* mask otherwise.
1464 static unsigned int ata_read_log_page(struct ata_device *dev,
1465 u8 page, void *buf, unsigned int sectors)
1467 struct ata_taskfile tf;
1468 unsigned int err_mask;
1470 DPRINTK("read log page - page %d\n", page);
1472 ata_tf_init(dev, &tf);
1473 tf.command = ATA_CMD_READ_LOG_EXT;
1474 tf.lbal = page;
1475 tf.nsect = sectors;
1476 tf.hob_nsect = sectors >> 8;
1477 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
1478 tf.protocol = ATA_PROT_PIO;
1480 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1481 buf, sectors * ATA_SECT_SIZE, 0);
1483 DPRINTK("EXIT, err_mask=%x\n", err_mask);
1484 return err_mask;
1488 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1489 * @dev: Device to read log page 10h from
1490 * @tag: Resulting tag of the failed command
1491 * @tf: Resulting taskfile registers of the failed command
1493 * Read log page 10h to obtain NCQ error details and clear error
1494 * condition.
1496 * LOCKING:
1497 * Kernel thread context (may sleep).
1499 * RETURNS:
1500 * 0 on success, -errno otherwise.
1502 static int ata_eh_read_log_10h(struct ata_device *dev,
1503 int *tag, struct ata_taskfile *tf)
1505 u8 *buf = dev->link->ap->sector_buf;
1506 unsigned int err_mask;
1507 u8 csum;
1508 int i;
1510 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1);
1511 if (err_mask)
1512 return -EIO;
1514 csum = 0;
1515 for (i = 0; i < ATA_SECT_SIZE; i++)
1516 csum += buf[i];
1517 if (csum)
1518 ata_dev_printk(dev, KERN_WARNING,
1519 "invalid checksum 0x%x on log page 10h\n", csum);
1521 if (buf[0] & 0x80)
1522 return -ENOENT;
1524 *tag = buf[0] & 0x1f;
1526 tf->command = buf[2];
1527 tf->feature = buf[3];
1528 tf->lbal = buf[4];
1529 tf->lbam = buf[5];
1530 tf->lbah = buf[6];
1531 tf->device = buf[7];
1532 tf->hob_lbal = buf[8];
1533 tf->hob_lbam = buf[9];
1534 tf->hob_lbah = buf[10];
1535 tf->nsect = buf[12];
1536 tf->hob_nsect = buf[13];
1538 return 0;
1542 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1543 * @dev: target ATAPI device
1544 * @r_sense_key: out parameter for sense_key
1546 * Perform ATAPI TEST_UNIT_READY.
1548 * LOCKING:
1549 * EH context (may sleep).
1551 * RETURNS:
1552 * 0 on success, AC_ERR_* mask on failure.
1554 static unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key)
1556 u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 };
1557 struct ata_taskfile tf;
1558 unsigned int err_mask;
1560 ata_tf_init(dev, &tf);
1562 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1563 tf.command = ATA_CMD_PACKET;
1564 tf.protocol = ATAPI_PROT_NODATA;
1566 err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
1567 if (err_mask == AC_ERR_DEV)
1568 *r_sense_key = tf.feature >> 4;
1569 return err_mask;
1573 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1574 * @dev: device to perform REQUEST_SENSE to
1575 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
1576 * @dfl_sense_key: default sense key to use
1578 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1579 * SENSE. This function is EH helper.
1581 * LOCKING:
1582 * Kernel thread context (may sleep).
1584 * RETURNS:
1585 * 0 on success, AC_ERR_* mask on failure
1587 static unsigned int atapi_eh_request_sense(struct ata_device *dev,
1588 u8 *sense_buf, u8 dfl_sense_key)
1590 u8 cdb[ATAPI_CDB_LEN] =
1591 { REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 };
1592 struct ata_port *ap = dev->link->ap;
1593 struct ata_taskfile tf;
1595 DPRINTK("ATAPI request sense\n");
1597 /* FIXME: is this needed? */
1598 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
1600 /* initialize sense_buf with the error register,
1601 * for the case where they are -not- overwritten
1603 sense_buf[0] = 0x70;
1604 sense_buf[2] = dfl_sense_key;
1606 /* some devices time out if garbage left in tf */
1607 ata_tf_init(dev, &tf);
1609 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1610 tf.command = ATA_CMD_PACKET;
1612 /* is it pointless to prefer PIO for "safety reasons"? */
1613 if (ap->flags & ATA_FLAG_PIO_DMA) {
1614 tf.protocol = ATAPI_PROT_DMA;
1615 tf.feature |= ATAPI_PKT_DMA;
1616 } else {
1617 tf.protocol = ATAPI_PROT_PIO;
1618 tf.lbam = SCSI_SENSE_BUFFERSIZE;
1619 tf.lbah = 0;
1622 return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
1623 sense_buf, SCSI_SENSE_BUFFERSIZE, 0);
1627 * ata_eh_analyze_serror - analyze SError for a failed port
1628 * @link: ATA link to analyze SError for
1630 * Analyze SError if available and further determine cause of
1631 * failure.
1633 * LOCKING:
1634 * None.
1636 static void ata_eh_analyze_serror(struct ata_link *link)
1638 struct ata_eh_context *ehc = &link->eh_context;
1639 u32 serror = ehc->i.serror;
1640 unsigned int err_mask = 0, action = 0;
1641 u32 hotplug_mask;
1643 if (serror & (SERR_PERSISTENT | SERR_DATA)) {
1644 err_mask |= AC_ERR_ATA_BUS;
1645 action |= ATA_EH_RESET;
1647 if (serror & SERR_PROTOCOL) {
1648 err_mask |= AC_ERR_HSM;
1649 action |= ATA_EH_RESET;
1651 if (serror & SERR_INTERNAL) {
1652 err_mask |= AC_ERR_SYSTEM;
1653 action |= ATA_EH_RESET;
1656 /* Determine whether a hotplug event has occurred. Both
1657 * SError.N/X are considered hotplug events for enabled or
1658 * host links. For disabled PMP links, only N bit is
1659 * considered as X bit is left at 1 for link plugging.
1661 if (link->lpm_policy > ATA_LPM_MAX_POWER)
1662 hotplug_mask = 0; /* hotplug doesn't work w/ LPM */
1663 else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
1664 hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;
1665 else
1666 hotplug_mask = SERR_PHYRDY_CHG;
1668 if (serror & hotplug_mask)
1669 ata_ehi_hotplugged(&ehc->i);
1671 ehc->i.err_mask |= err_mask;
1672 ehc->i.action |= action;
1676 * ata_eh_analyze_ncq_error - analyze NCQ error
1677 * @link: ATA link to analyze NCQ error for
1679 * Read log page 10h, determine the offending qc and acquire
1680 * error status TF. For NCQ device errors, all LLDDs have to do
1681 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1682 * care of the rest.
1684 * LOCKING:
1685 * Kernel thread context (may sleep).
1687 void ata_eh_analyze_ncq_error(struct ata_link *link)
1689 struct ata_port *ap = link->ap;
1690 struct ata_eh_context *ehc = &link->eh_context;
1691 struct ata_device *dev = link->device;
1692 struct ata_queued_cmd *qc;
1693 struct ata_taskfile tf;
1694 int tag, rc;
1696 /* if frozen, we can't do much */
1697 if (ap->pflags & ATA_PFLAG_FROZEN)
1698 return;
1700 /* is it NCQ device error? */
1701 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
1702 return;
1704 /* has LLDD analyzed already? */
1705 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1706 qc = __ata_qc_from_tag(ap, tag);
1708 if (!(qc->flags & ATA_QCFLAG_FAILED))
1709 continue;
1711 if (qc->err_mask)
1712 return;
1715 /* okay, this error is ours */
1716 memset(&tf, 0, sizeof(tf));
1717 rc = ata_eh_read_log_10h(dev, &tag, &tf);
1718 if (rc) {
1719 ata_link_printk(link, KERN_ERR, "failed to read log page 10h "
1720 "(errno=%d)\n", rc);
1721 return;
1724 if (!(link->sactive & (1 << tag))) {
1725 ata_link_printk(link, KERN_ERR, "log page 10h reported "
1726 "inactive tag %d\n", tag);
1727 return;
1730 /* we've got the perpetrator, condemn it */
1731 qc = __ata_qc_from_tag(ap, tag);
1732 memcpy(&qc->result_tf, &tf, sizeof(tf));
1733 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1734 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
1735 ehc->i.err_mask &= ~AC_ERR_DEV;
1739 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1740 * @qc: qc to analyze
1741 * @tf: Taskfile registers to analyze
1743 * Analyze taskfile of @qc and further determine cause of
1744 * failure. This function also requests ATAPI sense data if
1745 * available.
1747 * LOCKING:
1748 * Kernel thread context (may sleep).
1750 * RETURNS:
1751 * Determined recovery action
1753 static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
1754 const struct ata_taskfile *tf)
1756 unsigned int tmp, action = 0;
1757 u8 stat = tf->command, err = tf->feature;
1759 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
1760 qc->err_mask |= AC_ERR_HSM;
1761 return ATA_EH_RESET;
1764 if (stat & (ATA_ERR | ATA_DF))
1765 qc->err_mask |= AC_ERR_DEV;
1766 else
1767 return 0;
1769 switch (qc->dev->class) {
1770 case ATA_DEV_ATA:
1771 if (err & ATA_ICRC)
1772 qc->err_mask |= AC_ERR_ATA_BUS;
1773 if (err & ATA_UNC)
1774 qc->err_mask |= AC_ERR_MEDIA;
1775 if (err & ATA_IDNF)
1776 qc->err_mask |= AC_ERR_INVALID;
1777 break;
1779 case ATA_DEV_ATAPI:
1780 if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
1781 tmp = atapi_eh_request_sense(qc->dev,
1782 qc->scsicmd->sense_buffer,
1783 qc->result_tf.feature >> 4);
1784 if (!tmp) {
1785 /* ATA_QCFLAG_SENSE_VALID is used to
1786 * tell atapi_qc_complete() that sense
1787 * data is already valid.
1789 * TODO: interpret sense data and set
1790 * appropriate err_mask.
1792 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1793 } else
1794 qc->err_mask |= tmp;
1798 if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
1799 action |= ATA_EH_RESET;
1801 return action;
1804 static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask,
1805 int *xfer_ok)
1807 int base = 0;
1809 if (!(eflags & ATA_EFLAG_DUBIOUS_XFER))
1810 *xfer_ok = 1;
1812 if (!*xfer_ok)
1813 base = ATA_ECAT_DUBIOUS_NONE;
1815 if (err_mask & AC_ERR_ATA_BUS)
1816 return base + ATA_ECAT_ATA_BUS;
1818 if (err_mask & AC_ERR_TIMEOUT)
1819 return base + ATA_ECAT_TOUT_HSM;
1821 if (eflags & ATA_EFLAG_IS_IO) {
1822 if (err_mask & AC_ERR_HSM)
1823 return base + ATA_ECAT_TOUT_HSM;
1824 if ((err_mask &
1825 (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
1826 return base + ATA_ECAT_UNK_DEV;
1829 return 0;
1832 struct speed_down_verdict_arg {
1833 u64 since;
1834 int xfer_ok;
1835 int nr_errors[ATA_ECAT_NR];
1838 static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
1840 struct speed_down_verdict_arg *arg = void_arg;
1841 int cat;
1843 if ((ent->eflags & ATA_EFLAG_OLD_ER) || (ent->timestamp < arg->since))
1844 return -1;
1846 cat = ata_eh_categorize_error(ent->eflags, ent->err_mask,
1847 &arg->xfer_ok);
1848 arg->nr_errors[cat]++;
1850 return 0;
1854 * ata_eh_speed_down_verdict - Determine speed down verdict
1855 * @dev: Device of interest
1857 * This function examines error ring of @dev and determines
1858 * whether NCQ needs to be turned off, transfer speed should be
1859 * stepped down, or falling back to PIO is necessary.
1861 * ECAT_ATA_BUS : ATA_BUS error for any command
1863 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1864 * IO commands
1866 * ECAT_UNK_DEV : Unknown DEV error for IO commands
1868 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1869 * data transfer hasn't been verified.
1871 * Verdicts are
1873 * NCQ_OFF : Turn off NCQ.
1875 * SPEED_DOWN : Speed down transfer speed but don't fall back
1876 * to PIO.
1878 * FALLBACK_TO_PIO : Fall back to PIO.
1880 * Even if multiple verdicts are returned, only one action is
1881 * taken per error. An action triggered by non-DUBIOUS errors
1882 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1883 * This is to expedite speed down decisions right after device is
1884 * initially configured.
1886 * The followings are speed down rules. #1 and #2 deal with
1887 * DUBIOUS errors.
1889 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1890 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1892 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1893 * occurred during last 5 mins, NCQ_OFF.
1895 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
1896 * occurred during last 5 mins, FALLBACK_TO_PIO
1898 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
1899 * during last 10 mins, NCQ_OFF.
1901 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
1902 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
1904 * LOCKING:
1905 * Inherited from caller.
1907 * RETURNS:
1908 * OR of ATA_EH_SPDN_* flags.
1910 static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev)
1912 const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ;
1913 u64 j64 = get_jiffies_64();
1914 struct speed_down_verdict_arg arg;
1915 unsigned int verdict = 0;
1917 /* scan past 5 mins of error history */
1918 memset(&arg, 0, sizeof(arg));
1919 arg.since = j64 - min(j64, j5mins);
1920 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
1922 if (arg.nr_errors[ATA_ECAT_DUBIOUS_ATA_BUS] +
1923 arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1)
1924 verdict |= ATA_EH_SPDN_SPEED_DOWN |
1925 ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS;
1927 if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] +
1928 arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1)
1929 verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS;
1931 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
1932 arg.nr_errors[ATA_ECAT_TOUT_HSM] +
1933 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
1934 verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
1936 /* scan past 10 mins of error history */
1937 memset(&arg, 0, sizeof(arg));
1938 arg.since = j64 - min(j64, j10mins);
1939 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
1941 if (arg.nr_errors[ATA_ECAT_TOUT_HSM] +
1942 arg.nr_errors[ATA_ECAT_UNK_DEV] > 3)
1943 verdict |= ATA_EH_SPDN_NCQ_OFF;
1945 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
1946 arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 ||
1947 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
1948 verdict |= ATA_EH_SPDN_SPEED_DOWN;
1950 return verdict;
1954 * ata_eh_speed_down - record error and speed down if necessary
1955 * @dev: Failed device
1956 * @eflags: mask of ATA_EFLAG_* flags
1957 * @err_mask: err_mask of the error
1959 * Record error and examine error history to determine whether
1960 * adjusting transmission speed is necessary. It also sets
1961 * transmission limits appropriately if such adjustment is
1962 * necessary.
1964 * LOCKING:
1965 * Kernel thread context (may sleep).
1967 * RETURNS:
1968 * Determined recovery action.
1970 static unsigned int ata_eh_speed_down(struct ata_device *dev,
1971 unsigned int eflags, unsigned int err_mask)
1973 struct ata_link *link = ata_dev_phys_link(dev);
1974 int xfer_ok = 0;
1975 unsigned int verdict;
1976 unsigned int action = 0;
1978 /* don't bother if Cat-0 error */
1979 if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0)
1980 return 0;
1982 /* record error and determine whether speed down is necessary */
1983 ata_ering_record(&dev->ering, eflags, err_mask);
1984 verdict = ata_eh_speed_down_verdict(dev);
1986 /* turn off NCQ? */
1987 if ((verdict & ATA_EH_SPDN_NCQ_OFF) &&
1988 (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ |
1989 ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) {
1990 dev->flags |= ATA_DFLAG_NCQ_OFF;
1991 ata_dev_printk(dev, KERN_WARNING,
1992 "NCQ disabled due to excessive errors\n");
1993 goto done;
1996 /* speed down? */
1997 if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
1998 /* speed down SATA link speed if possible */
1999 if (sata_down_spd_limit(link, 0) == 0) {
2000 action |= ATA_EH_RESET;
2001 goto done;
2004 /* lower transfer mode */
2005 if (dev->spdn_cnt < 2) {
2006 static const int dma_dnxfer_sel[] =
2007 { ATA_DNXFER_DMA, ATA_DNXFER_40C };
2008 static const int pio_dnxfer_sel[] =
2009 { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 };
2010 int sel;
2012 if (dev->xfer_shift != ATA_SHIFT_PIO)
2013 sel = dma_dnxfer_sel[dev->spdn_cnt];
2014 else
2015 sel = pio_dnxfer_sel[dev->spdn_cnt];
2017 dev->spdn_cnt++;
2019 if (ata_down_xfermask_limit(dev, sel) == 0) {
2020 action |= ATA_EH_RESET;
2021 goto done;
2026 /* Fall back to PIO? Slowing down to PIO is meaningless for
2027 * SATA ATA devices. Consider it only for PATA and SATAPI.
2029 if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
2030 (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) &&
2031 (dev->xfer_shift != ATA_SHIFT_PIO)) {
2032 if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
2033 dev->spdn_cnt = 0;
2034 action |= ATA_EH_RESET;
2035 goto done;
2039 return 0;
2040 done:
2041 /* device has been slowed down, blow error history */
2042 if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS))
2043 ata_ering_clear(&dev->ering);
2044 return action;
2048 * ata_eh_link_autopsy - analyze error and determine recovery action
2049 * @link: host link to perform autopsy on
2051 * Analyze why @link failed and determine which recovery actions
2052 * are needed. This function also sets more detailed AC_ERR_*
2053 * values and fills sense data for ATAPI CHECK SENSE.
2055 * LOCKING:
2056 * Kernel thread context (may sleep).
2058 static void ata_eh_link_autopsy(struct ata_link *link)
2060 struct ata_port *ap = link->ap;
2061 struct ata_eh_context *ehc = &link->eh_context;
2062 struct ata_device *dev;
2063 unsigned int all_err_mask = 0, eflags = 0;
2064 int tag;
2065 u32 serror;
2066 int rc;
2068 DPRINTK("ENTER\n");
2070 if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
2071 return;
2073 /* obtain and analyze SError */
2074 rc = sata_scr_read(link, SCR_ERROR, &serror);
2075 if (rc == 0) {
2076 ehc->i.serror |= serror;
2077 ata_eh_analyze_serror(link);
2078 } else if (rc != -EOPNOTSUPP) {
2079 /* SError read failed, force reset and probing */
2080 ehc->i.probe_mask |= ATA_ALL_DEVICES;
2081 ehc->i.action |= ATA_EH_RESET;
2082 ehc->i.err_mask |= AC_ERR_OTHER;
2085 /* analyze NCQ failure */
2086 ata_eh_analyze_ncq_error(link);
2088 /* any real error trumps AC_ERR_OTHER */
2089 if (ehc->i.err_mask & ~AC_ERR_OTHER)
2090 ehc->i.err_mask &= ~AC_ERR_OTHER;
2092 all_err_mask |= ehc->i.err_mask;
2094 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2095 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2097 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2098 ata_dev_phys_link(qc->dev) != link)
2099 continue;
2101 /* inherit upper level err_mask */
2102 qc->err_mask |= ehc->i.err_mask;
2104 /* analyze TF */
2105 ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
2107 /* DEV errors are probably spurious in case of ATA_BUS error */
2108 if (qc->err_mask & AC_ERR_ATA_BUS)
2109 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
2110 AC_ERR_INVALID);
2112 /* any real error trumps unknown error */
2113 if (qc->err_mask & ~AC_ERR_OTHER)
2114 qc->err_mask &= ~AC_ERR_OTHER;
2116 /* SENSE_VALID trumps dev/unknown error and revalidation */
2117 if (qc->flags & ATA_QCFLAG_SENSE_VALID)
2118 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
2120 /* determine whether the command is worth retrying */
2121 if (qc->flags & ATA_QCFLAG_IO ||
2122 (!(qc->err_mask & AC_ERR_INVALID) &&
2123 qc->err_mask != AC_ERR_DEV))
2124 qc->flags |= ATA_QCFLAG_RETRY;
2126 /* accumulate error info */
2127 ehc->i.dev = qc->dev;
2128 all_err_mask |= qc->err_mask;
2129 if (qc->flags & ATA_QCFLAG_IO)
2130 eflags |= ATA_EFLAG_IS_IO;
2133 /* enforce default EH actions */
2134 if (ap->pflags & ATA_PFLAG_FROZEN ||
2135 all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
2136 ehc->i.action |= ATA_EH_RESET;
2137 else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) ||
2138 (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV)))
2139 ehc->i.action |= ATA_EH_REVALIDATE;
2141 /* If we have offending qcs and the associated failed device,
2142 * perform per-dev EH action only on the offending device.
2144 if (ehc->i.dev) {
2145 ehc->i.dev_action[ehc->i.dev->devno] |=
2146 ehc->i.action & ATA_EH_PERDEV_MASK;
2147 ehc->i.action &= ~ATA_EH_PERDEV_MASK;
2150 /* propagate timeout to host link */
2151 if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link))
2152 ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT;
2154 /* record error and consider speeding down */
2155 dev = ehc->i.dev;
2156 if (!dev && ((ata_link_max_devices(link) == 1 &&
2157 ata_dev_enabled(link->device))))
2158 dev = link->device;
2160 if (dev) {
2161 if (dev->flags & ATA_DFLAG_DUBIOUS_XFER)
2162 eflags |= ATA_EFLAG_DUBIOUS_XFER;
2163 ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
2166 DPRINTK("EXIT\n");
2170 * ata_eh_autopsy - analyze error and determine recovery action
2171 * @ap: host port to perform autopsy on
2173 * Analyze all links of @ap and determine why they failed and
2174 * which recovery actions are needed.
2176 * LOCKING:
2177 * Kernel thread context (may sleep).
2179 void ata_eh_autopsy(struct ata_port *ap)
2181 struct ata_link *link;
2183 ata_for_each_link(link, ap, EDGE)
2184 ata_eh_link_autopsy(link);
2186 /* Handle the frigging slave link. Autopsy is done similarly
2187 * but actions and flags are transferred over to the master
2188 * link and handled from there.
2190 if (ap->slave_link) {
2191 struct ata_eh_context *mehc = &ap->link.eh_context;
2192 struct ata_eh_context *sehc = &ap->slave_link->eh_context;
2194 /* transfer control flags from master to slave */
2195 sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
2197 /* perform autopsy on the slave link */
2198 ata_eh_link_autopsy(ap->slave_link);
2200 /* transfer actions from slave to master and clear slave */
2201 ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2202 mehc->i.action |= sehc->i.action;
2203 mehc->i.dev_action[1] |= sehc->i.dev_action[1];
2204 mehc->i.flags |= sehc->i.flags;
2205 ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2208 /* Autopsy of fanout ports can affect host link autopsy.
2209 * Perform host link autopsy last.
2211 if (sata_pmp_attached(ap))
2212 ata_eh_link_autopsy(&ap->link);
2216 * ata_get_cmd_descript - get description for ATA command
2217 * @command: ATA command code to get description for
2219 * Return a textual description of the given command, or NULL if the
2220 * command is not known.
2222 * LOCKING:
2223 * None
2225 const char *ata_get_cmd_descript(u8 command)
2227 #ifdef CONFIG_ATA_VERBOSE_ERROR
2228 static const struct
2230 u8 command;
2231 const char *text;
2232 } cmd_descr[] = {
2233 { ATA_CMD_DEV_RESET, "DEVICE RESET" },
2234 { ATA_CMD_CHK_POWER, "CHECK POWER MODE" },
2235 { ATA_CMD_STANDBY, "STANDBY" },
2236 { ATA_CMD_IDLE, "IDLE" },
2237 { ATA_CMD_EDD, "EXECUTE DEVICE DIAGNOSTIC" },
2238 { ATA_CMD_DOWNLOAD_MICRO, "DOWNLOAD MICROCODE" },
2239 { ATA_CMD_NOP, "NOP" },
2240 { ATA_CMD_FLUSH, "FLUSH CACHE" },
2241 { ATA_CMD_FLUSH_EXT, "FLUSH CACHE EXT" },
2242 { ATA_CMD_ID_ATA, "IDENTIFY DEVICE" },
2243 { ATA_CMD_ID_ATAPI, "IDENTIFY PACKET DEVICE" },
2244 { ATA_CMD_SERVICE, "SERVICE" },
2245 { ATA_CMD_READ, "READ DMA" },
2246 { ATA_CMD_READ_EXT, "READ DMA EXT" },
2247 { ATA_CMD_READ_QUEUED, "READ DMA QUEUED" },
2248 { ATA_CMD_READ_STREAM_EXT, "READ STREAM EXT" },
2249 { ATA_CMD_READ_STREAM_DMA_EXT, "READ STREAM DMA EXT" },
2250 { ATA_CMD_WRITE, "WRITE DMA" },
2251 { ATA_CMD_WRITE_EXT, "WRITE DMA EXT" },
2252 { ATA_CMD_WRITE_QUEUED, "WRITE DMA QUEUED EXT" },
2253 { ATA_CMD_WRITE_STREAM_EXT, "WRITE STREAM EXT" },
2254 { ATA_CMD_WRITE_STREAM_DMA_EXT, "WRITE STREAM DMA EXT" },
2255 { ATA_CMD_WRITE_FUA_EXT, "WRITE DMA FUA EXT" },
2256 { ATA_CMD_WRITE_QUEUED_FUA_EXT, "WRITE DMA QUEUED FUA EXT" },
2257 { ATA_CMD_FPDMA_READ, "READ FPDMA QUEUED" },
2258 { ATA_CMD_FPDMA_WRITE, "WRITE FPDMA QUEUED" },
2259 { ATA_CMD_PIO_READ, "READ SECTOR(S)" },
2260 { ATA_CMD_PIO_READ_EXT, "READ SECTOR(S) EXT" },
2261 { ATA_CMD_PIO_WRITE, "WRITE SECTOR(S)" },
2262 { ATA_CMD_PIO_WRITE_EXT, "WRITE SECTOR(S) EXT" },
2263 { ATA_CMD_READ_MULTI, "READ MULTIPLE" },
2264 { ATA_CMD_READ_MULTI_EXT, "READ MULTIPLE EXT" },
2265 { ATA_CMD_WRITE_MULTI, "WRITE MULTIPLE" },
2266 { ATA_CMD_WRITE_MULTI_EXT, "WRITE MULTIPLE EXT" },
2267 { ATA_CMD_WRITE_MULTI_FUA_EXT, "WRITE MULTIPLE FUA EXT" },
2268 { ATA_CMD_SET_FEATURES, "SET FEATURES" },
2269 { ATA_CMD_SET_MULTI, "SET MULTIPLE MODE" },
2270 { ATA_CMD_VERIFY, "READ VERIFY SECTOR(S)" },
2271 { ATA_CMD_VERIFY_EXT, "READ VERIFY SECTOR(S) EXT" },
2272 { ATA_CMD_WRITE_UNCORR_EXT, "WRITE UNCORRECTABLE EXT" },
2273 { ATA_CMD_STANDBYNOW1, "STANDBY IMMEDIATE" },
2274 { ATA_CMD_IDLEIMMEDIATE, "IDLE IMMEDIATE" },
2275 { ATA_CMD_SLEEP, "SLEEP" },
2276 { ATA_CMD_INIT_DEV_PARAMS, "INITIALIZE DEVICE PARAMETERS" },
2277 { ATA_CMD_READ_NATIVE_MAX, "READ NATIVE MAX ADDRESS" },
2278 { ATA_CMD_READ_NATIVE_MAX_EXT, "READ NATIVE MAX ADDRESS EXT" },
2279 { ATA_CMD_SET_MAX, "SET MAX ADDRESS" },
2280 { ATA_CMD_SET_MAX_EXT, "SET MAX ADDRESS EXT" },
2281 { ATA_CMD_READ_LOG_EXT, "READ LOG EXT" },
2282 { ATA_CMD_WRITE_LOG_EXT, "WRITE LOG EXT" },
2283 { ATA_CMD_READ_LOG_DMA_EXT, "READ LOG DMA EXT" },
2284 { ATA_CMD_WRITE_LOG_DMA_EXT, "WRITE LOG DMA EXT" },
2285 { ATA_CMD_TRUSTED_RCV, "TRUSTED RECEIVE" },
2286 { ATA_CMD_TRUSTED_RCV_DMA, "TRUSTED RECEIVE DMA" },
2287 { ATA_CMD_TRUSTED_SND, "TRUSTED SEND" },
2288 { ATA_CMD_TRUSTED_SND_DMA, "TRUSTED SEND DMA" },
2289 { ATA_CMD_PMP_READ, "READ BUFFER" },
2290 { ATA_CMD_PMP_WRITE, "WRITE BUFFER" },
2291 { ATA_CMD_CONF_OVERLAY, "DEVICE CONFIGURATION OVERLAY" },
2292 { ATA_CMD_SEC_SET_PASS, "SECURITY SET PASSWORD" },
2293 { ATA_CMD_SEC_UNLOCK, "SECURITY UNLOCK" },
2294 { ATA_CMD_SEC_ERASE_PREP, "SECURITY ERASE PREPARE" },
2295 { ATA_CMD_SEC_ERASE_UNIT, "SECURITY ERASE UNIT" },
2296 { ATA_CMD_SEC_FREEZE_LOCK, "SECURITY FREEZE LOCK" },
2297 { ATA_CMD_SEC_DISABLE_PASS, "SECURITY DISABLE PASSWORD" },
2298 { ATA_CMD_CONFIG_STREAM, "CONFIGURE STREAM" },
2299 { ATA_CMD_SMART, "SMART" },
2300 { ATA_CMD_MEDIA_LOCK, "DOOR LOCK" },
2301 { ATA_CMD_MEDIA_UNLOCK, "DOOR UNLOCK" },
2302 { ATA_CMD_DSM, "DATA SET MANAGEMENT" },
2303 { ATA_CMD_CHK_MED_CRD_TYP, "CHECK MEDIA CARD TYPE" },
2304 { ATA_CMD_CFA_REQ_EXT_ERR, "CFA REQUEST EXTENDED ERROR" },
2305 { ATA_CMD_CFA_WRITE_NE, "CFA WRITE SECTORS WITHOUT ERASE" },
2306 { ATA_CMD_CFA_TRANS_SECT, "CFA TRANSLATE SECTOR" },
2307 { ATA_CMD_CFA_ERASE, "CFA ERASE SECTORS" },
2308 { ATA_CMD_CFA_WRITE_MULT_NE, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2309 { ATA_CMD_READ_LONG, "READ LONG (with retries)" },
2310 { ATA_CMD_READ_LONG_ONCE, "READ LONG (without retries)" },
2311 { ATA_CMD_WRITE_LONG, "WRITE LONG (with retries)" },
2312 { ATA_CMD_WRITE_LONG_ONCE, "WRITE LONG (without retries)" },
2313 { ATA_CMD_RESTORE, "RECALIBRATE" },
2314 { 0, NULL } /* terminate list */
2317 unsigned int i;
2318 for (i = 0; cmd_descr[i].text; i++)
2319 if (cmd_descr[i].command == command)
2320 return cmd_descr[i].text;
2321 #endif
2323 return NULL;
2327 * ata_eh_link_report - report error handling to user
2328 * @link: ATA link EH is going on
2330 * Report EH to user.
2332 * LOCKING:
2333 * None.
2335 static void ata_eh_link_report(struct ata_link *link)
2337 struct ata_port *ap = link->ap;
2338 struct ata_eh_context *ehc = &link->eh_context;
2339 const char *frozen, *desc;
2340 char tries_buf[6];
2341 int tag, nr_failed = 0;
2343 if (ehc->i.flags & ATA_EHI_QUIET)
2344 return;
2346 desc = NULL;
2347 if (ehc->i.desc[0] != '\0')
2348 desc = ehc->i.desc;
2350 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2351 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2353 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2354 ata_dev_phys_link(qc->dev) != link ||
2355 ((qc->flags & ATA_QCFLAG_QUIET) &&
2356 qc->err_mask == AC_ERR_DEV))
2357 continue;
2358 if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
2359 continue;
2361 nr_failed++;
2364 if (!nr_failed && !ehc->i.err_mask)
2365 return;
2367 frozen = "";
2368 if (ap->pflags & ATA_PFLAG_FROZEN)
2369 frozen = " frozen";
2371 memset(tries_buf, 0, sizeof(tries_buf));
2372 if (ap->eh_tries < ATA_EH_MAX_TRIES)
2373 snprintf(tries_buf, sizeof(tries_buf) - 1, " t%d",
2374 ap->eh_tries);
2376 if (ehc->i.dev) {
2377 ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x "
2378 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2379 ehc->i.err_mask, link->sactive, ehc->i.serror,
2380 ehc->i.action, frozen, tries_buf);
2381 if (desc)
2382 ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc);
2383 } else {
2384 ata_link_printk(link, KERN_ERR, "exception Emask 0x%x "
2385 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2386 ehc->i.err_mask, link->sactive, ehc->i.serror,
2387 ehc->i.action, frozen, tries_buf);
2388 if (desc)
2389 ata_link_printk(link, KERN_ERR, "%s\n", desc);
2392 #ifdef CONFIG_ATA_VERBOSE_ERROR
2393 if (ehc->i.serror)
2394 ata_link_printk(link, KERN_ERR,
2395 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2396 ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "",
2397 ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "",
2398 ehc->i.serror & SERR_DATA ? "UnrecovData " : "",
2399 ehc->i.serror & SERR_PERSISTENT ? "Persist " : "",
2400 ehc->i.serror & SERR_PROTOCOL ? "Proto " : "",
2401 ehc->i.serror & SERR_INTERNAL ? "HostInt " : "",
2402 ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "",
2403 ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "",
2404 ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "",
2405 ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "",
2406 ehc->i.serror & SERR_DISPARITY ? "Dispar " : "",
2407 ehc->i.serror & SERR_CRC ? "BadCRC " : "",
2408 ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "",
2409 ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "",
2410 ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "",
2411 ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "",
2412 ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : "");
2413 #endif
2415 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2416 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2417 struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
2418 const u8 *cdb = qc->cdb;
2419 char data_buf[20] = "";
2420 char cdb_buf[70] = "";
2422 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2423 ata_dev_phys_link(qc->dev) != link || !qc->err_mask)
2424 continue;
2426 if (qc->dma_dir != DMA_NONE) {
2427 static const char *dma_str[] = {
2428 [DMA_BIDIRECTIONAL] = "bidi",
2429 [DMA_TO_DEVICE] = "out",
2430 [DMA_FROM_DEVICE] = "in",
2432 static const char *prot_str[] = {
2433 [ATA_PROT_PIO] = "pio",
2434 [ATA_PROT_DMA] = "dma",
2435 [ATA_PROT_NCQ] = "ncq",
2436 [ATAPI_PROT_PIO] = "pio",
2437 [ATAPI_PROT_DMA] = "dma",
2440 snprintf(data_buf, sizeof(data_buf), " %s %u %s",
2441 prot_str[qc->tf.protocol], qc->nbytes,
2442 dma_str[qc->dma_dir]);
2445 if (ata_is_atapi(qc->tf.protocol)) {
2446 if (qc->scsicmd)
2447 scsi_print_command(qc->scsicmd);
2448 else
2449 snprintf(cdb_buf, sizeof(cdb_buf),
2450 "cdb %02x %02x %02x %02x %02x %02x %02x %02x "
2451 "%02x %02x %02x %02x %02x %02x %02x %02x\n ",
2452 cdb[0], cdb[1], cdb[2], cdb[3],
2453 cdb[4], cdb[5], cdb[6], cdb[7],
2454 cdb[8], cdb[9], cdb[10], cdb[11],
2455 cdb[12], cdb[13], cdb[14], cdb[15]);
2456 } else {
2457 const char *descr = ata_get_cmd_descript(cmd->command);
2458 if (descr)
2459 ata_dev_printk(qc->dev, KERN_ERR,
2460 "failed command: %s\n", descr);
2463 ata_dev_printk(qc->dev, KERN_ERR,
2464 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2465 "tag %d%s\n %s"
2466 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
2467 "Emask 0x%x (%s)%s\n",
2468 cmd->command, cmd->feature, cmd->nsect,
2469 cmd->lbal, cmd->lbam, cmd->lbah,
2470 cmd->hob_feature, cmd->hob_nsect,
2471 cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,
2472 cmd->device, qc->tag, data_buf, cdb_buf,
2473 res->command, res->feature, res->nsect,
2474 res->lbal, res->lbam, res->lbah,
2475 res->hob_feature, res->hob_nsect,
2476 res->hob_lbal, res->hob_lbam, res->hob_lbah,
2477 res->device, qc->err_mask, ata_err_string(qc->err_mask),
2478 qc->err_mask & AC_ERR_NCQ ? " <F>" : "");
2480 #ifdef CONFIG_ATA_VERBOSE_ERROR
2481 if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ |
2482 ATA_ERR)) {
2483 if (res->command & ATA_BUSY)
2484 ata_dev_printk(qc->dev, KERN_ERR,
2485 "status: { Busy }\n");
2486 else
2487 ata_dev_printk(qc->dev, KERN_ERR,
2488 "status: { %s%s%s%s}\n",
2489 res->command & ATA_DRDY ? "DRDY " : "",
2490 res->command & ATA_DF ? "DF " : "",
2491 res->command & ATA_DRQ ? "DRQ " : "",
2492 res->command & ATA_ERR ? "ERR " : "");
2495 if (cmd->command != ATA_CMD_PACKET &&
2496 (res->feature & (ATA_ICRC | ATA_UNC | ATA_IDNF |
2497 ATA_ABORTED)))
2498 ata_dev_printk(qc->dev, KERN_ERR,
2499 "error: { %s%s%s%s}\n",
2500 res->feature & ATA_ICRC ? "ICRC " : "",
2501 res->feature & ATA_UNC ? "UNC " : "",
2502 res->feature & ATA_IDNF ? "IDNF " : "",
2503 res->feature & ATA_ABORTED ? "ABRT " : "");
2504 #endif
2509 * ata_eh_report - report error handling to user
2510 * @ap: ATA port to report EH about
2512 * Report EH to user.
2514 * LOCKING:
2515 * None.
2517 void ata_eh_report(struct ata_port *ap)
2519 struct ata_link *link;
2521 ata_for_each_link(link, ap, HOST_FIRST)
2522 ata_eh_link_report(link);
2525 static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
2526 unsigned int *classes, unsigned long deadline,
2527 bool clear_classes)
2529 struct ata_device *dev;
2531 if (clear_classes)
2532 ata_for_each_dev(dev, link, ALL)
2533 classes[dev->devno] = ATA_DEV_UNKNOWN;
2535 return reset(link, classes, deadline);
2538 static int ata_eh_followup_srst_needed(struct ata_link *link,
2539 int rc, const unsigned int *classes)
2541 if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link))
2542 return 0;
2543 if (rc == -EAGAIN)
2544 return 1;
2545 if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
2546 return 1;
2547 return 0;
2550 int ata_eh_reset(struct ata_link *link, int classify,
2551 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
2552 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
2554 struct ata_port *ap = link->ap;
2555 struct ata_link *slave = ap->slave_link;
2556 struct ata_eh_context *ehc = &link->eh_context;
2557 struct ata_eh_context *sehc = slave ? &slave->eh_context : NULL;
2558 unsigned int *classes = ehc->classes;
2559 unsigned int lflags = link->flags;
2560 int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
2561 int max_tries = 0, try = 0;
2562 struct ata_link *failed_link;
2563 struct ata_device *dev;
2564 unsigned long deadline, now;
2565 ata_reset_fn_t reset;
2566 unsigned long flags;
2567 u32 sstatus;
2568 int nr_unknown, rc;
2571 * Prepare to reset
2573 while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
2574 max_tries++;
2575 if (link->flags & ATA_LFLAG_NO_HRST)
2576 hardreset = NULL;
2577 if (link->flags & ATA_LFLAG_NO_SRST)
2578 softreset = NULL;
2580 /* make sure each reset attempt is at least COOL_DOWN apart */
2581 if (ehc->i.flags & ATA_EHI_DID_RESET) {
2582 now = jiffies;
2583 WARN_ON(time_after(ehc->last_reset, now));
2584 deadline = ata_deadline(ehc->last_reset,
2585 ATA_EH_RESET_COOL_DOWN);
2586 if (time_before(now, deadline))
2587 schedule_timeout_uninterruptible(deadline - now);
2590 spin_lock_irqsave(ap->lock, flags);
2591 ap->pflags |= ATA_PFLAG_RESETTING;
2592 spin_unlock_irqrestore(ap->lock, flags);
2594 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
2596 ata_for_each_dev(dev, link, ALL) {
2597 /* If we issue an SRST then an ATA drive (not ATAPI)
2598 * may change configuration and be in PIO0 timing. If
2599 * we do a hard reset (or are coming from power on)
2600 * this is true for ATA or ATAPI. Until we've set a
2601 * suitable controller mode we should not touch the
2602 * bus as we may be talking too fast.
2604 dev->pio_mode = XFER_PIO_0;
2606 /* If the controller has a pio mode setup function
2607 * then use it to set the chipset to rights. Don't
2608 * touch the DMA setup as that will be dealt with when
2609 * configuring devices.
2611 if (ap->ops->set_piomode)
2612 ap->ops->set_piomode(ap, dev);
2615 /* prefer hardreset */
2616 reset = NULL;
2617 ehc->i.action &= ~ATA_EH_RESET;
2618 if (hardreset) {
2619 reset = hardreset;
2620 ehc->i.action |= ATA_EH_HARDRESET;
2621 } else if (softreset) {
2622 reset = softreset;
2623 ehc->i.action |= ATA_EH_SOFTRESET;
2626 if (prereset) {
2627 unsigned long deadline = ata_deadline(jiffies,
2628 ATA_EH_PRERESET_TIMEOUT);
2630 if (slave) {
2631 sehc->i.action &= ~ATA_EH_RESET;
2632 sehc->i.action |= ehc->i.action;
2635 rc = prereset(link, deadline);
2637 /* If present, do prereset on slave link too. Reset
2638 * is skipped iff both master and slave links report
2639 * -ENOENT or clear ATA_EH_RESET.
2641 if (slave && (rc == 0 || rc == -ENOENT)) {
2642 int tmp;
2644 tmp = prereset(slave, deadline);
2645 if (tmp != -ENOENT)
2646 rc = tmp;
2648 ehc->i.action |= sehc->i.action;
2651 if (rc) {
2652 if (rc == -ENOENT) {
2653 ata_link_printk(link, KERN_DEBUG,
2654 "port disabled. ignoring.\n");
2655 ehc->i.action &= ~ATA_EH_RESET;
2657 ata_for_each_dev(dev, link, ALL)
2658 classes[dev->devno] = ATA_DEV_NONE;
2660 rc = 0;
2661 } else
2662 ata_link_printk(link, KERN_ERR,
2663 "prereset failed (errno=%d)\n", rc);
2664 goto out;
2667 /* prereset() might have cleared ATA_EH_RESET. If so,
2668 * bang classes, thaw and return.
2670 if (reset && !(ehc->i.action & ATA_EH_RESET)) {
2671 ata_for_each_dev(dev, link, ALL)
2672 classes[dev->devno] = ATA_DEV_NONE;
2673 if ((ap->pflags & ATA_PFLAG_FROZEN) &&
2674 ata_is_host_link(link))
2675 ata_eh_thaw_port(ap);
2676 rc = 0;
2677 goto out;
2681 retry:
2683 * Perform reset
2685 if (ata_is_host_link(link))
2686 ata_eh_freeze_port(ap);
2688 deadline = ata_deadline(jiffies, ata_eh_reset_timeouts[try++]);
2690 if (reset) {
2691 if (verbose)
2692 ata_link_printk(link, KERN_INFO, "%s resetting link\n",
2693 reset == softreset ? "soft" : "hard");
2695 /* mark that this EH session started with reset */
2696 ehc->last_reset = jiffies;
2697 if (reset == hardreset)
2698 ehc->i.flags |= ATA_EHI_DID_HARDRESET;
2699 else
2700 ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
2702 rc = ata_do_reset(link, reset, classes, deadline, true);
2703 if (rc && rc != -EAGAIN) {
2704 failed_link = link;
2705 goto fail;
2708 /* hardreset slave link if existent */
2709 if (slave && reset == hardreset) {
2710 int tmp;
2712 if (verbose)
2713 ata_link_printk(slave, KERN_INFO,
2714 "hard resetting link\n");
2716 ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
2717 tmp = ata_do_reset(slave, reset, classes, deadline,
2718 false);
2719 switch (tmp) {
2720 case -EAGAIN:
2721 rc = -EAGAIN;
2722 case 0:
2723 break;
2724 default:
2725 failed_link = slave;
2726 rc = tmp;
2727 goto fail;
2731 /* perform follow-up SRST if necessary */
2732 if (reset == hardreset &&
2733 ata_eh_followup_srst_needed(link, rc, classes)) {
2734 reset = softreset;
2736 if (!reset) {
2737 ata_link_printk(link, KERN_ERR,
2738 "follow-up softreset required "
2739 "but no softreset available\n");
2740 failed_link = link;
2741 rc = -EINVAL;
2742 goto fail;
2745 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
2746 rc = ata_do_reset(link, reset, classes, deadline, true);
2747 if (rc) {
2748 failed_link = link;
2749 goto fail;
2752 } else {
2753 if (verbose)
2754 ata_link_printk(link, KERN_INFO, "no reset method "
2755 "available, skipping reset\n");
2756 if (!(lflags & ATA_LFLAG_ASSUME_CLASS))
2757 lflags |= ATA_LFLAG_ASSUME_ATA;
2761 * Post-reset processing
2763 ata_for_each_dev(dev, link, ALL) {
2764 /* After the reset, the device state is PIO 0 and the
2765 * controller state is undefined. Reset also wakes up
2766 * drives from sleeping mode.
2768 dev->pio_mode = XFER_PIO_0;
2769 dev->flags &= ~ATA_DFLAG_SLEEPING;
2771 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
2772 continue;
2774 /* apply class override */
2775 if (lflags & ATA_LFLAG_ASSUME_ATA)
2776 classes[dev->devno] = ATA_DEV_ATA;
2777 else if (lflags & ATA_LFLAG_ASSUME_SEMB)
2778 classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
2781 /* record current link speed */
2782 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
2783 link->sata_spd = (sstatus >> 4) & 0xf;
2784 if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0)
2785 slave->sata_spd = (sstatus >> 4) & 0xf;
2787 /* thaw the port */
2788 if (ata_is_host_link(link))
2789 ata_eh_thaw_port(ap);
2791 /* postreset() should clear hardware SError. Although SError
2792 * is cleared during link resume, clearing SError here is
2793 * necessary as some PHYs raise hotplug events after SRST.
2794 * This introduces race condition where hotplug occurs between
2795 * reset and here. This race is mediated by cross checking
2796 * link onlineness and classification result later.
2798 if (postreset) {
2799 postreset(link, classes);
2800 if (slave)
2801 postreset(slave, classes);
2805 * Some controllers can't be frozen very well and may set spurious
2806 * error conditions during reset. Clear accumulated error
2807 * information and re-thaw the port if frozen. As reset is the
2808 * final recovery action and we cross check link onlineness against
2809 * device classification later, no hotplug event is lost by this.
2811 spin_lock_irqsave(link->ap->lock, flags);
2812 memset(&link->eh_info, 0, sizeof(link->eh_info));
2813 if (slave)
2814 memset(&slave->eh_info, 0, sizeof(link->eh_info));
2815 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
2816 spin_unlock_irqrestore(link->ap->lock, flags);
2818 if (ap->pflags & ATA_PFLAG_FROZEN)
2819 ata_eh_thaw_port(ap);
2822 * Make sure onlineness and classification result correspond.
2823 * Hotplug could have happened during reset and some
2824 * controllers fail to wait while a drive is spinning up after
2825 * being hotplugged causing misdetection. By cross checking
2826 * link on/offlineness and classification result, those
2827 * conditions can be reliably detected and retried.
2829 nr_unknown = 0;
2830 ata_for_each_dev(dev, link, ALL) {
2831 if (ata_phys_link_online(ata_dev_phys_link(dev))) {
2832 if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
2833 ata_dev_printk(dev, KERN_DEBUG, "link online "
2834 "but device misclassifed\n");
2835 classes[dev->devno] = ATA_DEV_NONE;
2836 nr_unknown++;
2838 } else if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
2839 if (ata_class_enabled(classes[dev->devno]))
2840 ata_dev_printk(dev, KERN_DEBUG, "link offline, "
2841 "clearing class %d to NONE\n",
2842 classes[dev->devno]);
2843 classes[dev->devno] = ATA_DEV_NONE;
2844 } else if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
2845 ata_dev_printk(dev, KERN_DEBUG, "link status unknown, "
2846 "clearing UNKNOWN to NONE\n");
2847 classes[dev->devno] = ATA_DEV_NONE;
2851 if (classify && nr_unknown) {
2852 if (try < max_tries) {
2853 ata_link_printk(link, KERN_WARNING, "link online but "
2854 "%d devices misclassified, retrying\n",
2855 nr_unknown);
2856 failed_link = link;
2857 rc = -EAGAIN;
2858 goto fail;
2860 ata_link_printk(link, KERN_WARNING,
2861 "link online but %d devices misclassified, "
2862 "device detection might fail\n", nr_unknown);
2865 /* reset successful, schedule revalidation */
2866 ata_eh_done(link, NULL, ATA_EH_RESET);
2867 if (slave)
2868 ata_eh_done(slave, NULL, ATA_EH_RESET);
2869 ehc->last_reset = jiffies; /* update to completion time */
2870 ehc->i.action |= ATA_EH_REVALIDATE;
2871 link->lpm_policy = ATA_LPM_UNKNOWN; /* reset LPM state */
2873 rc = 0;
2874 out:
2875 /* clear hotplug flag */
2876 ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
2877 if (slave)
2878 sehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
2880 spin_lock_irqsave(ap->lock, flags);
2881 ap->pflags &= ~ATA_PFLAG_RESETTING;
2882 spin_unlock_irqrestore(ap->lock, flags);
2884 return rc;
2886 fail:
2887 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2888 if (!ata_is_host_link(link) &&
2889 sata_scr_read(link, SCR_STATUS, &sstatus))
2890 rc = -ERESTART;
2892 if (rc == -ERESTART || try >= max_tries)
2893 goto out;
2895 now = jiffies;
2896 if (time_before(now, deadline)) {
2897 unsigned long delta = deadline - now;
2899 ata_link_printk(failed_link, KERN_WARNING,
2900 "reset failed (errno=%d), retrying in %u secs\n",
2901 rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
2903 ata_eh_release(ap);
2904 while (delta)
2905 delta = schedule_timeout_uninterruptible(delta);
2906 ata_eh_acquire(ap);
2909 if (try == max_tries - 1) {
2910 sata_down_spd_limit(link, 0);
2911 if (slave)
2912 sata_down_spd_limit(slave, 0);
2913 } else if (rc == -EPIPE)
2914 sata_down_spd_limit(failed_link, 0);
2916 if (hardreset)
2917 reset = hardreset;
2918 goto retry;
2921 static inline void ata_eh_pull_park_action(struct ata_port *ap)
2923 struct ata_link *link;
2924 struct ata_device *dev;
2925 unsigned long flags;
2928 * This function can be thought of as an extended version of
2929 * ata_eh_about_to_do() specially crafted to accommodate the
2930 * requirements of ATA_EH_PARK handling. Since the EH thread
2931 * does not leave the do {} while () loop in ata_eh_recover as
2932 * long as the timeout for a park request to *one* device on
2933 * the port has not expired, and since we still want to pick
2934 * up park requests to other devices on the same port or
2935 * timeout updates for the same device, we have to pull
2936 * ATA_EH_PARK actions from eh_info into eh_context.i
2937 * ourselves at the beginning of each pass over the loop.
2939 * Additionally, all write accesses to &ap->park_req_pending
2940 * through INIT_COMPLETION() (see below) or complete_all()
2941 * (see ata_scsi_park_store()) are protected by the host lock.
2942 * As a result we have that park_req_pending.done is zero on
2943 * exit from this function, i.e. when ATA_EH_PARK actions for
2944 * *all* devices on port ap have been pulled into the
2945 * respective eh_context structs. If, and only if,
2946 * park_req_pending.done is non-zero by the time we reach
2947 * wait_for_completion_timeout(), another ATA_EH_PARK action
2948 * has been scheduled for at least one of the devices on port
2949 * ap and we have to cycle over the do {} while () loop in
2950 * ata_eh_recover() again.
2953 spin_lock_irqsave(ap->lock, flags);
2954 INIT_COMPLETION(ap->park_req_pending);
2955 ata_for_each_link(link, ap, EDGE) {
2956 ata_for_each_dev(dev, link, ALL) {
2957 struct ata_eh_info *ehi = &link->eh_info;
2959 link->eh_context.i.dev_action[dev->devno] |=
2960 ehi->dev_action[dev->devno] & ATA_EH_PARK;
2961 ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK);
2964 spin_unlock_irqrestore(ap->lock, flags);
2967 static void ata_eh_park_issue_cmd(struct ata_device *dev, int park)
2969 struct ata_eh_context *ehc = &dev->link->eh_context;
2970 struct ata_taskfile tf;
2971 unsigned int err_mask;
2973 ata_tf_init(dev, &tf);
2974 if (park) {
2975 ehc->unloaded_mask |= 1 << dev->devno;
2976 tf.command = ATA_CMD_IDLEIMMEDIATE;
2977 tf.feature = 0x44;
2978 tf.lbal = 0x4c;
2979 tf.lbam = 0x4e;
2980 tf.lbah = 0x55;
2981 } else {
2982 ehc->unloaded_mask &= ~(1 << dev->devno);
2983 tf.command = ATA_CMD_CHK_POWER;
2986 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
2987 tf.protocol |= ATA_PROT_NODATA;
2988 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
2989 if (park && (err_mask || tf.lbal != 0xc4)) {
2990 ata_dev_printk(dev, KERN_ERR, "head unload failed!\n");
2991 ehc->unloaded_mask &= ~(1 << dev->devno);
2995 static int ata_eh_revalidate_and_attach(struct ata_link *link,
2996 struct ata_device **r_failed_dev)
2998 struct ata_port *ap = link->ap;
2999 struct ata_eh_context *ehc = &link->eh_context;
3000 struct ata_device *dev;
3001 unsigned int new_mask = 0;
3002 unsigned long flags;
3003 int rc = 0;
3005 DPRINTK("ENTER\n");
3007 /* For PATA drive side cable detection to work, IDENTIFY must
3008 * be done backwards such that PDIAG- is released by the slave
3009 * device before the master device is identified.
3011 ata_for_each_dev(dev, link, ALL_REVERSE) {
3012 unsigned int action = ata_eh_dev_action(dev);
3013 unsigned int readid_flags = 0;
3015 if (ehc->i.flags & ATA_EHI_DID_RESET)
3016 readid_flags |= ATA_READID_POSTRESET;
3018 if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
3019 WARN_ON(dev->class == ATA_DEV_PMP);
3021 if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
3022 rc = -EIO;
3023 goto err;
3026 ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE);
3027 rc = ata_dev_revalidate(dev, ehc->classes[dev->devno],
3028 readid_flags);
3029 if (rc)
3030 goto err;
3032 ata_eh_done(link, dev, ATA_EH_REVALIDATE);
3034 /* Configuration may have changed, reconfigure
3035 * transfer mode.
3037 ehc->i.flags |= ATA_EHI_SETMODE;
3039 /* schedule the scsi_rescan_device() here */
3040 schedule_work(&(ap->scsi_rescan_task));
3041 } else if (dev->class == ATA_DEV_UNKNOWN &&
3042 ehc->tries[dev->devno] &&
3043 ata_class_enabled(ehc->classes[dev->devno])) {
3044 /* Temporarily set dev->class, it will be
3045 * permanently set once all configurations are
3046 * complete. This is necessary because new
3047 * device configuration is done in two
3048 * separate loops.
3050 dev->class = ehc->classes[dev->devno];
3052 if (dev->class == ATA_DEV_PMP)
3053 rc = sata_pmp_attach(dev);
3054 else
3055 rc = ata_dev_read_id(dev, &dev->class,
3056 readid_flags, dev->id);
3058 /* read_id might have changed class, store and reset */
3059 ehc->classes[dev->devno] = dev->class;
3060 dev->class = ATA_DEV_UNKNOWN;
3062 switch (rc) {
3063 case 0:
3064 /* clear error info accumulated during probe */
3065 ata_ering_clear(&dev->ering);
3066 new_mask |= 1 << dev->devno;
3067 break;
3068 case -ENOENT:
3069 /* IDENTIFY was issued to non-existent
3070 * device. No need to reset. Just
3071 * thaw and ignore the device.
3073 ata_eh_thaw_port(ap);
3074 break;
3075 default:
3076 goto err;
3081 /* PDIAG- should have been released, ask cable type if post-reset */
3082 if ((ehc->i.flags & ATA_EHI_DID_RESET) && ata_is_host_link(link)) {
3083 if (ap->ops->cable_detect)
3084 ap->cbl = ap->ops->cable_detect(ap);
3085 ata_force_cbl(ap);
3088 /* Configure new devices forward such that user doesn't see
3089 * device detection messages backwards.
3091 ata_for_each_dev(dev, link, ALL) {
3092 if (!(new_mask & (1 << dev->devno)))
3093 continue;
3095 dev->class = ehc->classes[dev->devno];
3097 if (dev->class == ATA_DEV_PMP)
3098 continue;
3100 ehc->i.flags |= ATA_EHI_PRINTINFO;
3101 rc = ata_dev_configure(dev);
3102 ehc->i.flags &= ~ATA_EHI_PRINTINFO;
3103 if (rc) {
3104 dev->class = ATA_DEV_UNKNOWN;
3105 goto err;
3108 spin_lock_irqsave(ap->lock, flags);
3109 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
3110 spin_unlock_irqrestore(ap->lock, flags);
3112 /* new device discovered, configure xfermode */
3113 ehc->i.flags |= ATA_EHI_SETMODE;
3116 return 0;
3118 err:
3119 *r_failed_dev = dev;
3120 DPRINTK("EXIT rc=%d\n", rc);
3121 return rc;
3125 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3126 * @link: link on which timings will be programmed
3127 * @r_failed_dev: out parameter for failed device
3129 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3130 * ata_set_mode() fails, pointer to the failing device is
3131 * returned in @r_failed_dev.
3133 * LOCKING:
3134 * PCI/etc. bus probe sem.
3136 * RETURNS:
3137 * 0 on success, negative errno otherwise
3139 int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3141 struct ata_port *ap = link->ap;
3142 struct ata_device *dev;
3143 int rc;
3145 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
3146 ata_for_each_dev(dev, link, ENABLED) {
3147 if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) {
3148 struct ata_ering_entry *ent;
3150 ent = ata_ering_top(&dev->ering);
3151 if (ent)
3152 ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER;
3156 /* has private set_mode? */
3157 if (ap->ops->set_mode)
3158 rc = ap->ops->set_mode(link, r_failed_dev);
3159 else
3160 rc = ata_do_set_mode(link, r_failed_dev);
3162 /* if transfer mode has changed, set DUBIOUS_XFER on device */
3163 ata_for_each_dev(dev, link, ENABLED) {
3164 struct ata_eh_context *ehc = &link->eh_context;
3165 u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
3166 u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
3168 if (dev->xfer_mode != saved_xfer_mode ||
3169 ata_ncq_enabled(dev) != saved_ncq)
3170 dev->flags |= ATA_DFLAG_DUBIOUS_XFER;
3173 return rc;
3177 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3178 * @dev: ATAPI device to clear UA for
3180 * Resets and other operations can make an ATAPI device raise
3181 * UNIT ATTENTION which causes the next operation to fail. This
3182 * function clears UA.
3184 * LOCKING:
3185 * EH context (may sleep).
3187 * RETURNS:
3188 * 0 on success, -errno on failure.
3190 static int atapi_eh_clear_ua(struct ata_device *dev)
3192 int i;
3194 for (i = 0; i < ATA_EH_UA_TRIES; i++) {
3195 u8 *sense_buffer = dev->link->ap->sector_buf;
3196 u8 sense_key = 0;
3197 unsigned int err_mask;
3199 err_mask = atapi_eh_tur(dev, &sense_key);
3200 if (err_mask != 0 && err_mask != AC_ERR_DEV) {
3201 ata_dev_printk(dev, KERN_WARNING, "TEST_UNIT_READY "
3202 "failed (err_mask=0x%x)\n", err_mask);
3203 return -EIO;
3206 if (!err_mask || sense_key != UNIT_ATTENTION)
3207 return 0;
3209 err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
3210 if (err_mask) {
3211 ata_dev_printk(dev, KERN_WARNING, "failed to clear "
3212 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
3213 return -EIO;
3217 ata_dev_printk(dev, KERN_WARNING,
3218 "UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES);
3220 return 0;
3224 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3225 * @dev: ATA device which may need FLUSH retry
3227 * If @dev failed FLUSH, it needs to be reported upper layer
3228 * immediately as it means that @dev failed to remap and already
3229 * lost at least a sector and further FLUSH retrials won't make
3230 * any difference to the lost sector. However, if FLUSH failed
3231 * for other reasons, for example transmission error, FLUSH needs
3232 * to be retried.
3234 * This function determines whether FLUSH failure retry is
3235 * necessary and performs it if so.
3237 * RETURNS:
3238 * 0 if EH can continue, -errno if EH needs to be repeated.
3240 static int ata_eh_maybe_retry_flush(struct ata_device *dev)
3242 struct ata_link *link = dev->link;
3243 struct ata_port *ap = link->ap;
3244 struct ata_queued_cmd *qc;
3245 struct ata_taskfile tf;
3246 unsigned int err_mask;
3247 int rc = 0;
3249 /* did flush fail for this device? */
3250 if (!ata_tag_valid(link->active_tag))
3251 return 0;
3253 qc = __ata_qc_from_tag(ap, link->active_tag);
3254 if (qc->dev != dev || (qc->tf.command != ATA_CMD_FLUSH_EXT &&
3255 qc->tf.command != ATA_CMD_FLUSH))
3256 return 0;
3258 /* if the device failed it, it should be reported to upper layers */
3259 if (qc->err_mask & AC_ERR_DEV)
3260 return 0;
3262 /* flush failed for some other reason, give it another shot */
3263 ata_tf_init(dev, &tf);
3265 tf.command = qc->tf.command;
3266 tf.flags |= ATA_TFLAG_DEVICE;
3267 tf.protocol = ATA_PROT_NODATA;
3269 ata_dev_printk(dev, KERN_WARNING, "retrying FLUSH 0x%x Emask 0x%x\n",
3270 tf.command, qc->err_mask);
3272 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3273 if (!err_mask) {
3275 * FLUSH is complete but there's no way to
3276 * successfully complete a failed command from EH.
3277 * Making sure retry is allowed at least once and
3278 * retrying it should do the trick - whatever was in
3279 * the cache is already on the platter and this won't
3280 * cause infinite loop.
3282 qc->scsicmd->allowed = max(qc->scsicmd->allowed, 1);
3283 } else {
3284 ata_dev_printk(dev, KERN_WARNING, "FLUSH failed Emask 0x%x\n",
3285 err_mask);
3286 rc = -EIO;
3288 /* if device failed it, report it to upper layers */
3289 if (err_mask & AC_ERR_DEV) {
3290 qc->err_mask |= AC_ERR_DEV;
3291 qc->result_tf = tf;
3292 if (!(ap->pflags & ATA_PFLAG_FROZEN))
3293 rc = 0;
3296 return rc;
3300 * ata_eh_set_lpm - configure SATA interface power management
3301 * @link: link to configure power management
3302 * @policy: the link power management policy
3303 * @r_failed_dev: out parameter for failed device
3305 * Enable SATA Interface power management. This will enable
3306 * Device Interface Power Management (DIPM) for min_power
3307 * policy, and then call driver specific callbacks for
3308 * enabling Host Initiated Power management.
3310 * LOCKING:
3311 * EH context.
3313 * RETURNS:
3314 * 0 on success, -errno on failure.
3316 static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3317 struct ata_device **r_failed_dev)
3319 struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
3320 struct ata_eh_context *ehc = &link->eh_context;
3321 struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
3322 enum ata_lpm_policy old_policy = link->lpm_policy;
3323 bool no_dipm = link->ap->flags & ATA_FLAG_NO_DIPM;
3324 unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
3325 unsigned int err_mask;
3326 int rc;
3328 /* if the link or host doesn't do LPM, noop */
3329 if ((link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
3330 return 0;
3333 * DIPM is enabled only for MIN_POWER as some devices
3334 * misbehave when the host NACKs transition to SLUMBER. Order
3335 * device and link configurations such that the host always
3336 * allows DIPM requests.
3338 ata_for_each_dev(dev, link, ENABLED) {
3339 bool hipm = ata_id_has_hipm(dev->id);
3340 bool dipm = ata_id_has_dipm(dev->id) && !no_dipm;
3342 /* find the first enabled and LPM enabled devices */
3343 if (!link_dev)
3344 link_dev = dev;
3346 if (!lpm_dev && (hipm || dipm))
3347 lpm_dev = dev;
3349 hints &= ~ATA_LPM_EMPTY;
3350 if (!hipm)
3351 hints &= ~ATA_LPM_HIPM;
3353 /* disable DIPM before changing link config */
3354 if (policy != ATA_LPM_MIN_POWER && dipm) {
3355 err_mask = ata_dev_set_feature(dev,
3356 SETFEATURES_SATA_DISABLE, SATA_DIPM);
3357 if (err_mask && err_mask != AC_ERR_DEV) {
3358 ata_dev_printk(dev, KERN_WARNING,
3359 "failed to disable DIPM, Emask 0x%x\n",
3360 err_mask);
3361 rc = -EIO;
3362 goto fail;
3367 if (ap) {
3368 rc = ap->ops->set_lpm(link, policy, hints);
3369 if (!rc && ap->slave_link)
3370 rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
3371 } else
3372 rc = sata_pmp_set_lpm(link, policy, hints);
3375 * Attribute link config failure to the first (LPM) enabled
3376 * device on the link.
3378 if (rc) {
3379 if (rc == -EOPNOTSUPP) {
3380 link->flags |= ATA_LFLAG_NO_LPM;
3381 return 0;
3383 dev = lpm_dev ? lpm_dev : link_dev;
3384 goto fail;
3388 * Low level driver acked the transition. Issue DIPM command
3389 * with the new policy set.
3391 link->lpm_policy = policy;
3392 if (ap && ap->slave_link)
3393 ap->slave_link->lpm_policy = policy;
3395 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3396 ata_for_each_dev(dev, link, ENABLED) {
3397 if (policy == ATA_LPM_MIN_POWER && !no_dipm &&
3398 ata_id_has_dipm(dev->id)) {
3399 err_mask = ata_dev_set_feature(dev,
3400 SETFEATURES_SATA_ENABLE, SATA_DIPM);
3401 if (err_mask && err_mask != AC_ERR_DEV) {
3402 ata_dev_printk(dev, KERN_WARNING,
3403 "failed to enable DIPM, Emask 0x%x\n",
3404 err_mask);
3405 rc = -EIO;
3406 goto fail;
3411 return 0;
3413 fail:
3414 /* restore the old policy */
3415 link->lpm_policy = old_policy;
3416 if (ap && ap->slave_link)
3417 ap->slave_link->lpm_policy = old_policy;
3419 /* if no device or only one more chance is left, disable LPM */
3420 if (!dev || ehc->tries[dev->devno] <= 2) {
3421 ata_link_printk(link, KERN_WARNING,
3422 "disabling LPM on the link\n");
3423 link->flags |= ATA_LFLAG_NO_LPM;
3425 if (r_failed_dev)
3426 *r_failed_dev = dev;
3427 return rc;
3430 int ata_link_nr_enabled(struct ata_link *link)
3432 struct ata_device *dev;
3433 int cnt = 0;
3435 ata_for_each_dev(dev, link, ENABLED)
3436 cnt++;
3437 return cnt;
3440 static int ata_link_nr_vacant(struct ata_link *link)
3442 struct ata_device *dev;
3443 int cnt = 0;
3445 ata_for_each_dev(dev, link, ALL)
3446 if (dev->class == ATA_DEV_UNKNOWN)
3447 cnt++;
3448 return cnt;
3451 static int ata_eh_skip_recovery(struct ata_link *link)
3453 struct ata_port *ap = link->ap;
3454 struct ata_eh_context *ehc = &link->eh_context;
3455 struct ata_device *dev;
3457 /* skip disabled links */
3458 if (link->flags & ATA_LFLAG_DISABLED)
3459 return 1;
3461 /* skip if explicitly requested */
3462 if (ehc->i.flags & ATA_EHI_NO_RECOVERY)
3463 return 1;
3465 /* thaw frozen port and recover failed devices */
3466 if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link))
3467 return 0;
3469 /* reset at least once if reset is requested */
3470 if ((ehc->i.action & ATA_EH_RESET) &&
3471 !(ehc->i.flags & ATA_EHI_DID_RESET))
3472 return 0;
3474 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
3475 ata_for_each_dev(dev, link, ALL) {
3476 if (dev->class == ATA_DEV_UNKNOWN &&
3477 ehc->classes[dev->devno] != ATA_DEV_NONE)
3478 return 0;
3481 return 1;
3484 static int ata_count_probe_trials_cb(struct ata_ering_entry *ent, void *void_arg)
3486 u64 interval = msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL);
3487 u64 now = get_jiffies_64();
3488 int *trials = void_arg;
3490 if ((ent->eflags & ATA_EFLAG_OLD_ER) ||
3491 (ent->timestamp < now - min(now, interval)))
3492 return -1;
3494 (*trials)++;
3495 return 0;
3498 static int ata_eh_schedule_probe(struct ata_device *dev)
3500 struct ata_eh_context *ehc = &dev->link->eh_context;
3501 struct ata_link *link = ata_dev_phys_link(dev);
3502 int trials = 0;
3504 if (!(ehc->i.probe_mask & (1 << dev->devno)) ||
3505 (ehc->did_probe_mask & (1 << dev->devno)))
3506 return 0;
3508 ata_eh_detach_dev(dev);
3509 ata_dev_init(dev);
3510 ehc->did_probe_mask |= (1 << dev->devno);
3511 ehc->i.action |= ATA_EH_RESET;
3512 ehc->saved_xfer_mode[dev->devno] = 0;
3513 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
3515 /* the link maybe in a deep sleep, wake it up */
3516 if (link->lpm_policy > ATA_LPM_MAX_POWER) {
3517 if (ata_is_host_link(link))
3518 link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER,
3519 ATA_LPM_EMPTY);
3520 else
3521 sata_pmp_set_lpm(link, ATA_LPM_MAX_POWER,
3522 ATA_LPM_EMPTY);
3525 /* Record and count probe trials on the ering. The specific
3526 * error mask used is irrelevant. Because a successful device
3527 * detection clears the ering, this count accumulates only if
3528 * there are consecutive failed probes.
3530 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3531 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3532 * forced to 1.5Gbps.
3534 * This is to work around cases where failed link speed
3535 * negotiation results in device misdetection leading to
3536 * infinite DEVXCHG or PHRDY CHG events.
3538 ata_ering_record(&dev->ering, 0, AC_ERR_OTHER);
3539 ata_ering_map(&dev->ering, ata_count_probe_trials_cb, &trials);
3541 if (trials > ATA_EH_PROBE_TRIALS)
3542 sata_down_spd_limit(link, 1);
3544 return 1;
3547 static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
3549 struct ata_eh_context *ehc = &dev->link->eh_context;
3551 /* -EAGAIN from EH routine indicates retry without prejudice.
3552 * The requester is responsible for ensuring forward progress.
3554 if (err != -EAGAIN)
3555 ehc->tries[dev->devno]--;
3557 switch (err) {
3558 case -ENODEV:
3559 /* device missing or wrong IDENTIFY data, schedule probing */
3560 ehc->i.probe_mask |= (1 << dev->devno);
3561 case -EINVAL:
3562 /* give it just one more chance */
3563 ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
3564 case -EIO:
3565 if (ehc->tries[dev->devno] == 1) {
3566 /* This is the last chance, better to slow
3567 * down than lose it.
3569 sata_down_spd_limit(ata_dev_phys_link(dev), 0);
3570 if (dev->pio_mode > XFER_PIO_0)
3571 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
3575 if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
3576 /* disable device if it has used up all its chances */
3577 ata_dev_disable(dev);
3579 /* detach if offline */
3580 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
3581 ata_eh_detach_dev(dev);
3583 /* schedule probe if necessary */
3584 if (ata_eh_schedule_probe(dev)) {
3585 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
3586 memset(ehc->cmd_timeout_idx[dev->devno], 0,
3587 sizeof(ehc->cmd_timeout_idx[dev->devno]));
3590 return 1;
3591 } else {
3592 ehc->i.action |= ATA_EH_RESET;
3593 return 0;
3598 * ata_eh_recover - recover host port after error
3599 * @ap: host port to recover
3600 * @prereset: prereset method (can be NULL)
3601 * @softreset: softreset method (can be NULL)
3602 * @hardreset: hardreset method (can be NULL)
3603 * @postreset: postreset method (can be NULL)
3604 * @r_failed_link: out parameter for failed link
3606 * This is the alpha and omega, eum and yang, heart and soul of
3607 * libata exception handling. On entry, actions required to
3608 * recover each link and hotplug requests are recorded in the
3609 * link's eh_context. This function executes all the operations
3610 * with appropriate retrials and fallbacks to resurrect failed
3611 * devices, detach goners and greet newcomers.
3613 * LOCKING:
3614 * Kernel thread context (may sleep).
3616 * RETURNS:
3617 * 0 on success, -errno on failure.
3619 int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
3620 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3621 ata_postreset_fn_t postreset,
3622 struct ata_link **r_failed_link)
3624 struct ata_link *link;
3625 struct ata_device *dev;
3626 int rc, nr_fails;
3627 unsigned long flags, deadline;
3629 DPRINTK("ENTER\n");
3631 /* prep for recovery */
3632 ata_for_each_link(link, ap, EDGE) {
3633 struct ata_eh_context *ehc = &link->eh_context;
3635 /* re-enable link? */
3636 if (ehc->i.action & ATA_EH_ENABLE_LINK) {
3637 ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK);
3638 spin_lock_irqsave(ap->lock, flags);
3639 link->flags &= ~ATA_LFLAG_DISABLED;
3640 spin_unlock_irqrestore(ap->lock, flags);
3641 ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK);
3644 ata_for_each_dev(dev, link, ALL) {
3645 if (link->flags & ATA_LFLAG_NO_RETRY)
3646 ehc->tries[dev->devno] = 1;
3647 else
3648 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
3650 /* collect port action mask recorded in dev actions */
3651 ehc->i.action |= ehc->i.dev_action[dev->devno] &
3652 ~ATA_EH_PERDEV_MASK;
3653 ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK;
3655 /* process hotplug request */
3656 if (dev->flags & ATA_DFLAG_DETACH)
3657 ata_eh_detach_dev(dev);
3659 /* schedule probe if necessary */
3660 if (!ata_dev_enabled(dev))
3661 ata_eh_schedule_probe(dev);
3665 retry:
3666 rc = 0;
3668 /* if UNLOADING, finish immediately */
3669 if (ap->pflags & ATA_PFLAG_UNLOADING)
3670 goto out;
3672 /* prep for EH */
3673 ata_for_each_link(link, ap, EDGE) {
3674 struct ata_eh_context *ehc = &link->eh_context;
3676 /* skip EH if possible. */
3677 if (ata_eh_skip_recovery(link))
3678 ehc->i.action = 0;
3680 ata_for_each_dev(dev, link, ALL)
3681 ehc->classes[dev->devno] = ATA_DEV_UNKNOWN;
3684 /* reset */
3685 ata_for_each_link(link, ap, EDGE) {
3686 struct ata_eh_context *ehc = &link->eh_context;
3688 if (!(ehc->i.action & ATA_EH_RESET))
3689 continue;
3691 rc = ata_eh_reset(link, ata_link_nr_vacant(link),
3692 prereset, softreset, hardreset, postreset);
3693 if (rc) {
3694 ata_link_printk(link, KERN_ERR,
3695 "reset failed, giving up\n");
3696 goto out;
3700 do {
3701 unsigned long now;
3704 * clears ATA_EH_PARK in eh_info and resets
3705 * ap->park_req_pending
3707 ata_eh_pull_park_action(ap);
3709 deadline = jiffies;
3710 ata_for_each_link(link, ap, EDGE) {
3711 ata_for_each_dev(dev, link, ALL) {
3712 struct ata_eh_context *ehc = &link->eh_context;
3713 unsigned long tmp;
3715 if (dev->class != ATA_DEV_ATA)
3716 continue;
3717 if (!(ehc->i.dev_action[dev->devno] &
3718 ATA_EH_PARK))
3719 continue;
3720 tmp = dev->unpark_deadline;
3721 if (time_before(deadline, tmp))
3722 deadline = tmp;
3723 else if (time_before_eq(tmp, jiffies))
3724 continue;
3725 if (ehc->unloaded_mask & (1 << dev->devno))
3726 continue;
3728 ata_eh_park_issue_cmd(dev, 1);
3732 now = jiffies;
3733 if (time_before_eq(deadline, now))
3734 break;
3736 ata_eh_release(ap);
3737 deadline = wait_for_completion_timeout(&ap->park_req_pending,
3738 deadline - now);
3739 ata_eh_acquire(ap);
3740 } while (deadline);
3741 ata_for_each_link(link, ap, EDGE) {
3742 ata_for_each_dev(dev, link, ALL) {
3743 if (!(link->eh_context.unloaded_mask &
3744 (1 << dev->devno)))
3745 continue;
3747 ata_eh_park_issue_cmd(dev, 0);
3748 ata_eh_done(link, dev, ATA_EH_PARK);
3752 /* the rest */
3753 nr_fails = 0;
3754 ata_for_each_link(link, ap, PMP_FIRST) {
3755 struct ata_eh_context *ehc = &link->eh_context;
3757 if (sata_pmp_attached(ap) && ata_is_host_link(link))
3758 goto config_lpm;
3760 /* revalidate existing devices and attach new ones */
3761 rc = ata_eh_revalidate_and_attach(link, &dev);
3762 if (rc)
3763 goto rest_fail;
3765 /* if PMP got attached, return, pmp EH will take care of it */
3766 if (link->device->class == ATA_DEV_PMP) {
3767 ehc->i.action = 0;
3768 return 0;
3771 /* configure transfer mode if necessary */
3772 if (ehc->i.flags & ATA_EHI_SETMODE) {
3773 rc = ata_set_mode(link, &dev);
3774 if (rc)
3775 goto rest_fail;
3776 ehc->i.flags &= ~ATA_EHI_SETMODE;
3779 /* If reset has been issued, clear UA to avoid
3780 * disrupting the current users of the device.
3782 if (ehc->i.flags & ATA_EHI_DID_RESET) {
3783 ata_for_each_dev(dev, link, ALL) {
3784 if (dev->class != ATA_DEV_ATAPI)
3785 continue;
3786 rc = atapi_eh_clear_ua(dev);
3787 if (rc)
3788 goto rest_fail;
3792 /* retry flush if necessary */
3793 ata_for_each_dev(dev, link, ALL) {
3794 if (dev->class != ATA_DEV_ATA)
3795 continue;
3796 rc = ata_eh_maybe_retry_flush(dev);
3797 if (rc)
3798 goto rest_fail;
3801 config_lpm:
3802 /* configure link power saving */
3803 if (link->lpm_policy != ap->target_lpm_policy) {
3804 rc = ata_eh_set_lpm(link, ap->target_lpm_policy, &dev);
3805 if (rc)
3806 goto rest_fail;
3809 /* this link is okay now */
3810 ehc->i.flags = 0;
3811 continue;
3813 rest_fail:
3814 nr_fails++;
3815 if (dev)
3816 ata_eh_handle_dev_fail(dev, rc);
3818 if (ap->pflags & ATA_PFLAG_FROZEN) {
3819 /* PMP reset requires working host port.
3820 * Can't retry if it's frozen.
3822 if (sata_pmp_attached(ap))
3823 goto out;
3824 break;
3828 if (nr_fails)
3829 goto retry;
3831 out:
3832 if (rc && r_failed_link)
3833 *r_failed_link = link;
3835 DPRINTK("EXIT, rc=%d\n", rc);
3836 return rc;
3840 * ata_eh_finish - finish up EH
3841 * @ap: host port to finish EH for
3843 * Recovery is complete. Clean up EH states and retry or finish
3844 * failed qcs.
3846 * LOCKING:
3847 * None.
3849 void ata_eh_finish(struct ata_port *ap)
3851 int tag;
3853 /* retry or finish qcs */
3854 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
3855 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
3857 if (!(qc->flags & ATA_QCFLAG_FAILED))
3858 continue;
3860 if (qc->err_mask) {
3861 /* FIXME: Once EH migration is complete,
3862 * generate sense data in this function,
3863 * considering both err_mask and tf.
3865 if (qc->flags & ATA_QCFLAG_RETRY)
3866 ata_eh_qc_retry(qc);
3867 else
3868 ata_eh_qc_complete(qc);
3869 } else {
3870 if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
3871 ata_eh_qc_complete(qc);
3872 } else {
3873 /* feed zero TF to sense generation */
3874 memset(&qc->result_tf, 0, sizeof(qc->result_tf));
3875 ata_eh_qc_retry(qc);
3880 /* make sure nr_active_links is zero after EH */
3881 WARN_ON(ap->nr_active_links);
3882 ap->nr_active_links = 0;
3886 * ata_do_eh - do standard error handling
3887 * @ap: host port to handle error for
3889 * @prereset: prereset method (can be NULL)
3890 * @softreset: softreset method (can be NULL)
3891 * @hardreset: hardreset method (can be NULL)
3892 * @postreset: postreset method (can be NULL)
3894 * Perform standard error handling sequence.
3896 * LOCKING:
3897 * Kernel thread context (may sleep).
3899 void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
3900 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3901 ata_postreset_fn_t postreset)
3903 struct ata_device *dev;
3904 int rc;
3906 ata_eh_autopsy(ap);
3907 ata_eh_report(ap);
3909 rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset,
3910 NULL);
3911 if (rc) {
3912 ata_for_each_dev(dev, &ap->link, ALL)
3913 ata_dev_disable(dev);
3916 ata_eh_finish(ap);
3920 * ata_std_error_handler - standard error handler
3921 * @ap: host port to handle error for
3923 * Standard error handler
3925 * LOCKING:
3926 * Kernel thread context (may sleep).
3928 void ata_std_error_handler(struct ata_port *ap)
3930 struct ata_port_operations *ops = ap->ops;
3931 ata_reset_fn_t hardreset = ops->hardreset;
3933 /* ignore built-in hardreset if SCR access is not available */
3934 if (hardreset == sata_std_hardreset && !sata_scr_valid(&ap->link))
3935 hardreset = NULL;
3937 ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
3940 #ifdef CONFIG_PM
3942 * ata_eh_handle_port_suspend - perform port suspend operation
3943 * @ap: port to suspend
3945 * Suspend @ap.
3947 * LOCKING:
3948 * Kernel thread context (may sleep).
3950 static void ata_eh_handle_port_suspend(struct ata_port *ap)
3952 unsigned long flags;
3953 int rc = 0;
3955 /* are we suspending? */
3956 spin_lock_irqsave(ap->lock, flags);
3957 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
3958 ap->pm_mesg.event == PM_EVENT_ON) {
3959 spin_unlock_irqrestore(ap->lock, flags);
3960 return;
3962 spin_unlock_irqrestore(ap->lock, flags);
3964 WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
3966 /* tell ACPI we're suspending */
3967 rc = ata_acpi_on_suspend(ap);
3968 if (rc)
3969 goto out;
3971 /* suspend */
3972 ata_eh_freeze_port(ap);
3974 if (ap->ops->port_suspend)
3975 rc = ap->ops->port_suspend(ap, ap->pm_mesg);
3977 ata_acpi_set_state(ap, PMSG_SUSPEND);
3978 out:
3979 /* report result */
3980 spin_lock_irqsave(ap->lock, flags);
3982 ap->pflags &= ~ATA_PFLAG_PM_PENDING;
3983 if (rc == 0)
3984 ap->pflags |= ATA_PFLAG_SUSPENDED;
3985 else if (ap->pflags & ATA_PFLAG_FROZEN)
3986 ata_port_schedule_eh(ap);
3988 if (ap->pm_result) {
3989 *ap->pm_result = rc;
3990 ap->pm_result = NULL;
3993 spin_unlock_irqrestore(ap->lock, flags);
3995 return;
3999 * ata_eh_handle_port_resume - perform port resume operation
4000 * @ap: port to resume
4002 * Resume @ap.
4004 * LOCKING:
4005 * Kernel thread context (may sleep).
4007 static void ata_eh_handle_port_resume(struct ata_port *ap)
4009 struct ata_link *link;
4010 struct ata_device *dev;
4011 unsigned long flags;
4012 int rc = 0;
4014 /* are we resuming? */
4015 spin_lock_irqsave(ap->lock, flags);
4016 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
4017 ap->pm_mesg.event != PM_EVENT_ON) {
4018 spin_unlock_irqrestore(ap->lock, flags);
4019 return;
4021 spin_unlock_irqrestore(ap->lock, flags);
4023 WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
4026 * Error timestamps are in jiffies which doesn't run while
4027 * suspended and PHY events during resume isn't too uncommon.
4028 * When the two are combined, it can lead to unnecessary speed
4029 * downs if the machine is suspended and resumed repeatedly.
4030 * Clear error history.
4032 ata_for_each_link(link, ap, HOST_FIRST)
4033 ata_for_each_dev(dev, link, ALL)
4034 ata_ering_clear(&dev->ering);
4036 ata_acpi_set_state(ap, PMSG_ON);
4038 if (ap->ops->port_resume)
4039 rc = ap->ops->port_resume(ap);
4041 /* tell ACPI that we're resuming */
4042 ata_acpi_on_resume(ap);
4044 /* report result */
4045 spin_lock_irqsave(ap->lock, flags);
4046 ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
4047 if (ap->pm_result) {
4048 *ap->pm_result = rc;
4049 ap->pm_result = NULL;
4051 spin_unlock_irqrestore(ap->lock, flags);
4053 #endif /* CONFIG_PM */