2 * scsi_error.c Copyright (C) 1997 Eric Youngdale
4 * SCSI error/timeout handling
5 * Initial versions: Eric Youngdale. Based upon conversations with
6 * Leonard Zubkoff and David Miller at Linux Expo,
7 * ideas originating from all over the place.
9 * Restructured scsi_unjam_host and associated functions.
10 * September 04, 2002 Mike Anderson (andmike@us.ibm.com)
12 * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and
14 * September 30, 2002 Mike Anderson (andmike@us.ibm.com)
17 #include <linux/module.h>
18 #include <linux/sched.h>
19 #include <linux/gfp.h>
20 #include <linux/timer.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/freezer.h>
24 #include <linux/kthread.h>
25 #include <linux/interrupt.h>
26 #include <linux/blkdev.h>
27 #include <linux/delay.h>
28 #include <linux/jiffies.h>
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_dbg.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_driver.h>
35 #include <scsi/scsi_eh.h>
36 #include <scsi/scsi_common.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_host.h>
39 #include <scsi/scsi_ioctl.h>
40 #include <scsi/scsi_dh.h>
41 #include <scsi/scsi_devinfo.h>
44 #include "scsi_priv.h"
45 #include "scsi_logging.h"
46 #include "scsi_transport_api.h"
48 #include <trace/events/scsi.h>
50 #include <asm/unaligned.h>
52 static void scsi_eh_done(struct scsi_cmnd
*scmd
);
55 * These should *probably* be handled by the host itself.
56 * Since it is allowed to sleep, it probably should.
58 #define BUS_RESET_SETTLE_TIME (10)
59 #define HOST_RESET_SETTLE_TIME (10)
61 static int scsi_eh_try_stu(struct scsi_cmnd
*scmd
);
62 static int scsi_try_to_abort_cmd(struct scsi_host_template
*,
65 void scsi_eh_wakeup(struct Scsi_Host
*shost
)
67 lockdep_assert_held(shost
->host_lock
);
69 if (scsi_host_busy(shost
) == shost
->host_failed
) {
70 trace_scsi_eh_wakeup(shost
);
71 wake_up_process(shost
->ehandler
);
72 SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO
, shost
,
73 "Waking error handler thread\n"));
78 * scsi_schedule_eh - schedule EH for SCSI host
79 * @shost: SCSI host to invoke error handling on.
81 * Schedule SCSI EH without scmd.
83 void scsi_schedule_eh(struct Scsi_Host
*shost
)
87 spin_lock_irqsave(shost
->host_lock
, flags
);
89 if (scsi_host_set_state(shost
, SHOST_RECOVERY
) == 0 ||
90 scsi_host_set_state(shost
, SHOST_CANCEL_RECOVERY
) == 0) {
91 shost
->host_eh_scheduled
++;
92 scsi_eh_wakeup(shost
);
95 spin_unlock_irqrestore(shost
->host_lock
, flags
);
97 EXPORT_SYMBOL_GPL(scsi_schedule_eh
);
99 static int scsi_host_eh_past_deadline(struct Scsi_Host
*shost
)
101 if (!shost
->last_reset
|| shost
->eh_deadline
== -1)
105 * 32bit accesses are guaranteed to be atomic
106 * (on all supported architectures), so instead
107 * of using a spinlock we can as well double check
108 * if eh_deadline has been set to 'off' during the
111 if (time_before(jiffies
, shost
->last_reset
+ shost
->eh_deadline
) &&
112 shost
->eh_deadline
> -1)
119 * scmd_eh_abort_handler - Handle command aborts
120 * @work: command to be aborted.
122 * Note: this function must be called only for a command that has timed out.
123 * Because the block layer marks a request as complete before it calls
124 * scsi_times_out(), a .scsi_done() call from the LLD for a command that has
125 * timed out do not have any effect. Hence it is safe to call
126 * scsi_finish_command() from this function.
129 scmd_eh_abort_handler(struct work_struct
*work
)
131 struct scsi_cmnd
*scmd
=
132 container_of(work
, struct scsi_cmnd
, abort_work
.work
);
133 struct scsi_device
*sdev
= scmd
->device
;
136 if (scsi_host_eh_past_deadline(sdev
->host
)) {
137 SCSI_LOG_ERROR_RECOVERY(3,
138 scmd_printk(KERN_INFO
, scmd
,
139 "eh timeout, not aborting\n"));
141 SCSI_LOG_ERROR_RECOVERY(3,
142 scmd_printk(KERN_INFO
, scmd
,
143 "aborting command\n"));
144 rtn
= scsi_try_to_abort_cmd(sdev
->host
->hostt
, scmd
);
145 if (rtn
== SUCCESS
) {
146 set_host_byte(scmd
, DID_TIME_OUT
);
147 if (scsi_host_eh_past_deadline(sdev
->host
)) {
148 SCSI_LOG_ERROR_RECOVERY(3,
149 scmd_printk(KERN_INFO
, scmd
,
150 "eh timeout, not retrying "
151 "aborted command\n"));
152 } else if (!scsi_noretry_cmd(scmd
) &&
153 (++scmd
->retries
<= scmd
->allowed
)) {
154 SCSI_LOG_ERROR_RECOVERY(3,
155 scmd_printk(KERN_WARNING
, scmd
,
156 "retry aborted command\n"));
157 scsi_queue_insert(scmd
, SCSI_MLQUEUE_EH_RETRY
);
160 SCSI_LOG_ERROR_RECOVERY(3,
161 scmd_printk(KERN_WARNING
, scmd
,
162 "finish aborted command\n"));
163 scsi_finish_command(scmd
);
167 SCSI_LOG_ERROR_RECOVERY(3,
168 scmd_printk(KERN_INFO
, scmd
,
170 (rtn
== FAST_IO_FAIL
) ?
171 "not send" : "failed"));
175 scsi_eh_scmd_add(scmd
);
179 * scsi_abort_command - schedule a command abort
180 * @scmd: scmd to abort.
182 * We only need to abort commands after a command timeout
185 scsi_abort_command(struct scsi_cmnd
*scmd
)
187 struct scsi_device
*sdev
= scmd
->device
;
188 struct Scsi_Host
*shost
= sdev
->host
;
191 if (scmd
->eh_eflags
& SCSI_EH_ABORT_SCHEDULED
) {
193 * Retry after abort failed, escalate to next level.
195 SCSI_LOG_ERROR_RECOVERY(3,
196 scmd_printk(KERN_INFO
, scmd
,
197 "previous abort failed\n"));
198 BUG_ON(delayed_work_pending(&scmd
->abort_work
));
202 spin_lock_irqsave(shost
->host_lock
, flags
);
203 if (shost
->eh_deadline
!= -1 && !shost
->last_reset
)
204 shost
->last_reset
= jiffies
;
205 spin_unlock_irqrestore(shost
->host_lock
, flags
);
207 scmd
->eh_eflags
|= SCSI_EH_ABORT_SCHEDULED
;
208 SCSI_LOG_ERROR_RECOVERY(3,
209 scmd_printk(KERN_INFO
, scmd
, "abort scheduled\n"));
210 queue_delayed_work(shost
->tmf_work_q
, &scmd
->abort_work
, HZ
/ 100);
215 * scsi_eh_reset - call into ->eh_action to reset internal counters
216 * @scmd: scmd to run eh on.
218 * The scsi driver might be carrying internal state about the
219 * devices, so we need to call into the driver to reset the
220 * internal state once the error handler is started.
222 static void scsi_eh_reset(struct scsi_cmnd
*scmd
)
224 if (!blk_rq_is_passthrough(scmd
->request
)) {
225 struct scsi_driver
*sdrv
= scsi_cmd_to_driver(scmd
);
227 sdrv
->eh_reset(scmd
);
231 static void scsi_eh_inc_host_failed(struct rcu_head
*head
)
233 struct scsi_cmnd
*scmd
= container_of(head
, typeof(*scmd
), rcu
);
234 struct Scsi_Host
*shost
= scmd
->device
->host
;
237 spin_lock_irqsave(shost
->host_lock
, flags
);
238 shost
->host_failed
++;
239 scsi_eh_wakeup(shost
);
240 spin_unlock_irqrestore(shost
->host_lock
, flags
);
244 * scsi_eh_scmd_add - add scsi cmd to error handling.
245 * @scmd: scmd to run eh on.
247 void scsi_eh_scmd_add(struct scsi_cmnd
*scmd
)
249 struct Scsi_Host
*shost
= scmd
->device
->host
;
253 WARN_ON_ONCE(!shost
->ehandler
);
255 spin_lock_irqsave(shost
->host_lock
, flags
);
256 if (scsi_host_set_state(shost
, SHOST_RECOVERY
)) {
257 ret
= scsi_host_set_state(shost
, SHOST_CANCEL_RECOVERY
);
260 if (shost
->eh_deadline
!= -1 && !shost
->last_reset
)
261 shost
->last_reset
= jiffies
;
264 list_add_tail(&scmd
->eh_entry
, &shost
->eh_cmd_q
);
265 spin_unlock_irqrestore(shost
->host_lock
, flags
);
267 * Ensure that all tasks observe the host state change before the
268 * host_failed change.
270 call_rcu(&scmd
->rcu
, scsi_eh_inc_host_failed
);
274 * scsi_times_out - Timeout function for normal scsi commands.
275 * @req: request that is timing out.
278 * We do not need to lock this. There is the potential for a race
279 * only in that the normal completion handling might run, but if the
280 * normal completion function determines that the timer has already
281 * fired, then it mustn't do anything.
283 enum blk_eh_timer_return
scsi_times_out(struct request
*req
)
285 struct scsi_cmnd
*scmd
= blk_mq_rq_to_pdu(req
);
286 enum blk_eh_timer_return rtn
= BLK_EH_DONE
;
287 struct Scsi_Host
*host
= scmd
->device
->host
;
289 trace_scsi_dispatch_cmd_timeout(scmd
);
290 scsi_log_completion(scmd
, TIMEOUT_ERROR
);
292 if (host
->eh_deadline
!= -1 && !host
->last_reset
)
293 host
->last_reset
= jiffies
;
295 if (host
->hostt
->eh_timed_out
)
296 rtn
= host
->hostt
->eh_timed_out(scmd
);
298 if (rtn
== BLK_EH_DONE
) {
300 * Set the command to complete first in order to prevent a real
301 * completion from releasing the command while error handling
302 * is using it. If the command was already completed, then the
303 * lower level driver beat the timeout handler, and it is safe
304 * to return without escalating error recovery.
306 * If timeout handling lost the race to a real completion, the
307 * block layer may ignore that due to a fake timeout injection,
308 * so return RESET_TIMER to allow error handling another shot
311 if (test_and_set_bit(SCMD_STATE_COMPLETE
, &scmd
->state
))
312 return BLK_EH_RESET_TIMER
;
313 if (scsi_abort_command(scmd
) != SUCCESS
) {
314 set_host_byte(scmd
, DID_TIME_OUT
);
315 scsi_eh_scmd_add(scmd
);
323 * scsi_block_when_processing_errors - Prevent cmds from being queued.
324 * @sdev: Device on which we are performing recovery.
327 * We block until the host is out of error recovery, and then check to
328 * see whether the host or the device is offline.
331 * 0 when dev was taken offline by error recovery. 1 OK to proceed.
333 int scsi_block_when_processing_errors(struct scsi_device
*sdev
)
337 wait_event(sdev
->host
->host_wait
, !scsi_host_in_recovery(sdev
->host
));
339 online
= scsi_device_online(sdev
);
343 EXPORT_SYMBOL(scsi_block_when_processing_errors
);
345 #ifdef CONFIG_SCSI_LOGGING
347 * scsi_eh_prt_fail_stats - Log info on failures.
348 * @shost: scsi host being recovered.
349 * @work_q: Queue of scsi cmds to process.
351 static inline void scsi_eh_prt_fail_stats(struct Scsi_Host
*shost
,
352 struct list_head
*work_q
)
354 struct scsi_cmnd
*scmd
;
355 struct scsi_device
*sdev
;
356 int total_failures
= 0;
359 int devices_failed
= 0;
361 shost_for_each_device(sdev
, shost
) {
362 list_for_each_entry(scmd
, work_q
, eh_entry
) {
363 if (scmd
->device
== sdev
) {
365 if (scmd
->eh_eflags
& SCSI_EH_ABORT_SCHEDULED
)
372 if (cmd_cancel
|| cmd_failed
) {
373 SCSI_LOG_ERROR_RECOVERY(3,
374 shost_printk(KERN_INFO
, shost
,
375 "%s: cmds failed: %d, cancel: %d\n",
376 __func__
, cmd_failed
,
384 SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO
, shost
,
385 "Total of %d commands on %d"
386 " devices require eh work\n",
387 total_failures
, devices_failed
));
392 * scsi_report_lun_change - Set flag on all *other* devices on the same target
393 * to indicate that a UNIT ATTENTION is expected.
394 * @sdev: Device reporting the UNIT ATTENTION
396 static void scsi_report_lun_change(struct scsi_device
*sdev
)
398 sdev
->sdev_target
->expecting_lun_change
= 1;
402 * scsi_report_sense - Examine scsi sense information and log messages for
403 * certain conditions, also issue uevents for some of them.
404 * @sdev: Device reporting the sense code
405 * @sshdr: sshdr to be examined
407 static void scsi_report_sense(struct scsi_device
*sdev
,
408 struct scsi_sense_hdr
*sshdr
)
410 enum scsi_device_event evt_type
= SDEV_EVT_MAXBITS
; /* i.e. none */
412 if (sshdr
->sense_key
== UNIT_ATTENTION
) {
413 if (sshdr
->asc
== 0x3f && sshdr
->ascq
== 0x03) {
414 evt_type
= SDEV_EVT_INQUIRY_CHANGE_REPORTED
;
415 sdev_printk(KERN_WARNING
, sdev
,
416 "Inquiry data has changed");
417 } else if (sshdr
->asc
== 0x3f && sshdr
->ascq
== 0x0e) {
418 evt_type
= SDEV_EVT_LUN_CHANGE_REPORTED
;
419 scsi_report_lun_change(sdev
);
420 sdev_printk(KERN_WARNING
, sdev
,
421 "Warning! Received an indication that the "
422 "LUN assignments on this target have "
423 "changed. The Linux SCSI layer does not "
424 "automatically remap LUN assignments.\n");
425 } else if (sshdr
->asc
== 0x3f)
426 sdev_printk(KERN_WARNING
, sdev
,
427 "Warning! Received an indication that the "
428 "operating parameters on this target have "
429 "changed. The Linux SCSI layer does not "
430 "automatically adjust these parameters.\n");
432 if (sshdr
->asc
== 0x38 && sshdr
->ascq
== 0x07) {
433 evt_type
= SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED
;
434 sdev_printk(KERN_WARNING
, sdev
,
435 "Warning! Received an indication that the "
436 "LUN reached a thin provisioning soft "
440 if (sshdr
->asc
== 0x29) {
441 evt_type
= SDEV_EVT_POWER_ON_RESET_OCCURRED
;
442 sdev_printk(KERN_WARNING
, sdev
,
443 "Power-on or device reset occurred\n");
446 if (sshdr
->asc
== 0x2a && sshdr
->ascq
== 0x01) {
447 evt_type
= SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED
;
448 sdev_printk(KERN_WARNING
, sdev
,
449 "Mode parameters changed");
450 } else if (sshdr
->asc
== 0x2a && sshdr
->ascq
== 0x06) {
451 evt_type
= SDEV_EVT_ALUA_STATE_CHANGE_REPORTED
;
452 sdev_printk(KERN_WARNING
, sdev
,
453 "Asymmetric access state changed");
454 } else if (sshdr
->asc
== 0x2a && sshdr
->ascq
== 0x09) {
455 evt_type
= SDEV_EVT_CAPACITY_CHANGE_REPORTED
;
456 sdev_printk(KERN_WARNING
, sdev
,
457 "Capacity data has changed");
458 } else if (sshdr
->asc
== 0x2a)
459 sdev_printk(KERN_WARNING
, sdev
,
460 "Parameters changed");
463 if (evt_type
!= SDEV_EVT_MAXBITS
) {
464 set_bit(evt_type
, sdev
->pending_events
);
465 schedule_work(&sdev
->event_work
);
470 * scsi_check_sense - Examine scsi cmd sense
471 * @scmd: Cmd to have sense checked.
474 * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE
477 * When a deferred error is detected the current command has
478 * not been executed and needs retrying.
480 int scsi_check_sense(struct scsi_cmnd
*scmd
)
482 struct scsi_device
*sdev
= scmd
->device
;
483 struct scsi_sense_hdr sshdr
;
485 if (! scsi_command_normalize_sense(scmd
, &sshdr
))
486 return FAILED
; /* no valid sense data */
488 scsi_report_sense(sdev
, &sshdr
);
490 if (scsi_sense_is_deferred(&sshdr
))
493 if (sdev
->handler
&& sdev
->handler
->check_sense
) {
496 rc
= sdev
->handler
->check_sense(sdev
, &sshdr
);
497 if (rc
!= SCSI_RETURN_NOT_HANDLED
)
499 /* handler does not care. Drop down to default handling */
502 if (scmd
->cmnd
[0] == TEST_UNIT_READY
&& scmd
->scsi_done
!= scsi_eh_done
)
504 * nasty: for mid-layer issued TURs, we need to return the
505 * actual sense data without any recovery attempt. For eh
506 * issued ones, we need to try to recover and interpret
511 * Previous logic looked for FILEMARK, EOM or ILI which are
512 * mainly associated with tapes and returned SUCCESS.
514 if (sshdr
.response_code
== 0x70) {
516 if (scmd
->sense_buffer
[2] & 0xe0)
520 * descriptor format: look for "stream commands sense data
521 * descriptor" (see SSC-3). Assume single sense data
522 * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG.
524 if ((sshdr
.additional_length
> 3) &&
525 (scmd
->sense_buffer
[8] == 0x4) &&
526 (scmd
->sense_buffer
[11] & 0xe0))
530 switch (sshdr
.sense_key
) {
533 case RECOVERED_ERROR
:
534 return /* soft_error */ SUCCESS
;
536 case ABORTED_COMMAND
:
537 if (sshdr
.asc
== 0x10) /* DIF */
540 if (sshdr
.asc
== 0x44 && sdev
->sdev_bflags
& BLIST_RETRY_ITF
)
541 return ADD_TO_MLQUEUE
;
542 if (sshdr
.asc
== 0xc1 && sshdr
.ascq
== 0x01 &&
543 sdev
->sdev_bflags
& BLIST_RETRY_ASC_C1
)
544 return ADD_TO_MLQUEUE
;
550 * if we are expecting a cc/ua because of a bus reset that we
551 * performed, treat this just as a retry. otherwise this is
552 * information that we should pass up to the upper-level driver
553 * so that we can deal with it there.
555 if (scmd
->device
->expecting_cc_ua
) {
557 * Because some device does not queue unit
558 * attentions correctly, we carefully check
559 * additional sense code and qualifier so as
560 * not to squash media change unit attention.
562 if (sshdr
.asc
!= 0x28 || sshdr
.ascq
!= 0x00) {
563 scmd
->device
->expecting_cc_ua
= 0;
568 * we might also expect a cc/ua if another LUN on the target
569 * reported a UA with an ASC/ASCQ of 3F 0E -
570 * REPORTED LUNS DATA HAS CHANGED.
572 if (scmd
->device
->sdev_target
->expecting_lun_change
&&
573 sshdr
.asc
== 0x3f && sshdr
.ascq
== 0x0e)
576 * if the device is in the process of becoming ready, we
579 if ((sshdr
.asc
== 0x04) && (sshdr
.ascq
== 0x01))
582 * if the device is not started, we need to wake
583 * the error handler to start the motor
585 if (scmd
->device
->allow_restart
&&
586 (sshdr
.asc
== 0x04) && (sshdr
.ascq
== 0x02))
589 * Pass the UA upwards for a determination in the completion
594 /* these are not supported */
596 if (sshdr
.asc
== 0x27 && sshdr
.ascq
== 0x07) {
597 /* Thin provisioning hard threshold reached */
598 set_host_byte(scmd
, DID_ALLOC_FAILURE
);
603 case VOLUME_OVERFLOW
:
606 set_host_byte(scmd
, DID_TARGET_FAILURE
);
610 if (sshdr
.asc
== 0x11 || /* UNRECOVERED READ ERR */
611 sshdr
.asc
== 0x13 || /* AMNF DATA FIELD */
612 sshdr
.asc
== 0x14) { /* RECORD NOT FOUND */
613 set_host_byte(scmd
, DID_MEDIUM_ERROR
);
619 if (scmd
->device
->retry_hwerror
)
620 return ADD_TO_MLQUEUE
;
622 set_host_byte(scmd
, DID_TARGET_FAILURE
);
625 case ILLEGAL_REQUEST
:
626 if (sshdr
.asc
== 0x20 || /* Invalid command operation code */
627 sshdr
.asc
== 0x21 || /* Logical block address out of range */
628 sshdr
.asc
== 0x22 || /* Invalid function */
629 sshdr
.asc
== 0x24 || /* Invalid field in cdb */
630 sshdr
.asc
== 0x26 || /* Parameter value invalid */
631 sshdr
.asc
== 0x27) { /* Write protected */
632 set_host_byte(scmd
, DID_TARGET_FAILURE
);
640 EXPORT_SYMBOL_GPL(scsi_check_sense
);
642 static void scsi_handle_queue_ramp_up(struct scsi_device
*sdev
)
644 struct scsi_host_template
*sht
= sdev
->host
->hostt
;
645 struct scsi_device
*tmp_sdev
;
647 if (!sht
->track_queue_depth
||
648 sdev
->queue_depth
>= sdev
->max_queue_depth
)
651 if (time_before(jiffies
,
652 sdev
->last_queue_ramp_up
+ sdev
->queue_ramp_up_period
))
655 if (time_before(jiffies
,
656 sdev
->last_queue_full_time
+ sdev
->queue_ramp_up_period
))
660 * Walk all devices of a target and do
663 shost_for_each_device(tmp_sdev
, sdev
->host
) {
664 if (tmp_sdev
->channel
!= sdev
->channel
||
665 tmp_sdev
->id
!= sdev
->id
||
666 tmp_sdev
->queue_depth
== sdev
->max_queue_depth
)
669 scsi_change_queue_depth(tmp_sdev
, tmp_sdev
->queue_depth
+ 1);
670 sdev
->last_queue_ramp_up
= jiffies
;
674 static void scsi_handle_queue_full(struct scsi_device
*sdev
)
676 struct scsi_host_template
*sht
= sdev
->host
->hostt
;
677 struct scsi_device
*tmp_sdev
;
679 if (!sht
->track_queue_depth
)
682 shost_for_each_device(tmp_sdev
, sdev
->host
) {
683 if (tmp_sdev
->channel
!= sdev
->channel
||
684 tmp_sdev
->id
!= sdev
->id
)
687 * We do not know the number of commands that were at
688 * the device when we got the queue full so we start
689 * from the highest possible value and work our way down.
691 scsi_track_queue_full(tmp_sdev
, tmp_sdev
->queue_depth
- 1);
696 * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD.
697 * @scmd: SCSI cmd to examine.
700 * This is *only* called when we are examining the status of commands
701 * queued during error recovery. the main difference here is that we
702 * don't allow for the possibility of retries here, and we are a lot
703 * more restrictive about what we consider acceptable.
705 static int scsi_eh_completed_normally(struct scsi_cmnd
*scmd
)
708 * first check the host byte, to see if there is anything in there
709 * that would indicate what we need to do.
711 if (host_byte(scmd
->result
) == DID_RESET
) {
713 * rats. we are already in the error handler, so we now
714 * get to try and figure out what to do next. if the sense
715 * is valid, we have a pretty good idea of what to do.
716 * if not, we mark it as FAILED.
718 return scsi_check_sense(scmd
);
720 if (host_byte(scmd
->result
) != DID_OK
)
724 * next, check the message byte.
726 if (msg_byte(scmd
->result
) != COMMAND_COMPLETE
)
730 * now, check the status byte to see if this indicates
733 switch (status_byte(scmd
->result
)) {
735 scsi_handle_queue_ramp_up(scmd
->device
);
737 case COMMAND_TERMINATED
:
739 case CHECK_CONDITION
:
740 return scsi_check_sense(scmd
);
742 case INTERMEDIATE_GOOD
:
743 case INTERMEDIATE_C_GOOD
:
745 * who knows? FIXME(eric)
748 case RESERVATION_CONFLICT
:
749 if (scmd
->cmnd
[0] == TEST_UNIT_READY
)
750 /* it is a success, we probed the device and
753 /* otherwise, we failed to send the command */
756 scsi_handle_queue_full(scmd
->device
);
767 * scsi_eh_done - Completion function for error handling.
768 * @scmd: Cmd that is done.
770 static void scsi_eh_done(struct scsi_cmnd
*scmd
)
772 struct completion
*eh_action
;
774 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO
, scmd
,
775 "%s result: %x\n", __func__
, scmd
->result
));
777 eh_action
= scmd
->device
->host
->eh_action
;
783 * scsi_try_host_reset - ask host adapter to reset itself
784 * @scmd: SCSI cmd to send host reset.
786 static int scsi_try_host_reset(struct scsi_cmnd
*scmd
)
790 struct Scsi_Host
*host
= scmd
->device
->host
;
791 struct scsi_host_template
*hostt
= host
->hostt
;
793 SCSI_LOG_ERROR_RECOVERY(3,
794 shost_printk(KERN_INFO
, host
, "Snd Host RST\n"));
796 if (!hostt
->eh_host_reset_handler
)
799 rtn
= hostt
->eh_host_reset_handler(scmd
);
801 if (rtn
== SUCCESS
) {
802 if (!hostt
->skip_settle_delay
)
803 ssleep(HOST_RESET_SETTLE_TIME
);
804 spin_lock_irqsave(host
->host_lock
, flags
);
805 scsi_report_bus_reset(host
, scmd_channel(scmd
));
806 spin_unlock_irqrestore(host
->host_lock
, flags
);
813 * scsi_try_bus_reset - ask host to perform a bus reset
814 * @scmd: SCSI cmd to send bus reset.
816 static int scsi_try_bus_reset(struct scsi_cmnd
*scmd
)
820 struct Scsi_Host
*host
= scmd
->device
->host
;
821 struct scsi_host_template
*hostt
= host
->hostt
;
823 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO
, scmd
,
824 "%s: Snd Bus RST\n", __func__
));
826 if (!hostt
->eh_bus_reset_handler
)
829 rtn
= hostt
->eh_bus_reset_handler(scmd
);
831 if (rtn
== SUCCESS
) {
832 if (!hostt
->skip_settle_delay
)
833 ssleep(BUS_RESET_SETTLE_TIME
);
834 spin_lock_irqsave(host
->host_lock
, flags
);
835 scsi_report_bus_reset(host
, scmd_channel(scmd
));
836 spin_unlock_irqrestore(host
->host_lock
, flags
);
842 static void __scsi_report_device_reset(struct scsi_device
*sdev
, void *data
)
845 sdev
->expecting_cc_ua
= 1;
849 * scsi_try_target_reset - Ask host to perform a target reset
850 * @scmd: SCSI cmd used to send a target reset
853 * There is no timeout for this operation. if this operation is
854 * unreliable for a given host, then the host itself needs to put a
855 * timer on it, and set the host back to a consistent state prior to
858 static int scsi_try_target_reset(struct scsi_cmnd
*scmd
)
862 struct Scsi_Host
*host
= scmd
->device
->host
;
863 struct scsi_host_template
*hostt
= host
->hostt
;
865 if (!hostt
->eh_target_reset_handler
)
868 rtn
= hostt
->eh_target_reset_handler(scmd
);
869 if (rtn
== SUCCESS
) {
870 spin_lock_irqsave(host
->host_lock
, flags
);
871 __starget_for_each_device(scsi_target(scmd
->device
), NULL
,
872 __scsi_report_device_reset
);
873 spin_unlock_irqrestore(host
->host_lock
, flags
);
880 * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
881 * @scmd: SCSI cmd used to send BDR
884 * There is no timeout for this operation. if this operation is
885 * unreliable for a given host, then the host itself needs to put a
886 * timer on it, and set the host back to a consistent state prior to
889 static int scsi_try_bus_device_reset(struct scsi_cmnd
*scmd
)
892 struct scsi_host_template
*hostt
= scmd
->device
->host
->hostt
;
894 if (!hostt
->eh_device_reset_handler
)
897 rtn
= hostt
->eh_device_reset_handler(scmd
);
899 __scsi_report_device_reset(scmd
->device
, NULL
);
904 * scsi_try_to_abort_cmd - Ask host to abort a SCSI command
905 * @hostt: SCSI driver host template
906 * @scmd: SCSI cmd used to send a target reset
909 * SUCCESS, FAILED, or FAST_IO_FAIL
912 * SUCCESS does not necessarily indicate that the command
913 * has been aborted; it only indicates that the LLDDs
914 * has cleared all references to that command.
915 * LLDDs should return FAILED only if an abort was required
916 * but could not be executed. LLDDs should return FAST_IO_FAIL
917 * if the device is temporarily unavailable (eg due to a
918 * link down on FibreChannel)
920 static int scsi_try_to_abort_cmd(struct scsi_host_template
*hostt
,
921 struct scsi_cmnd
*scmd
)
923 if (!hostt
->eh_abort_handler
)
926 return hostt
->eh_abort_handler(scmd
);
929 static void scsi_abort_eh_cmnd(struct scsi_cmnd
*scmd
)
931 if (scsi_try_to_abort_cmd(scmd
->device
->host
->hostt
, scmd
) != SUCCESS
)
932 if (scsi_try_bus_device_reset(scmd
) != SUCCESS
)
933 if (scsi_try_target_reset(scmd
) != SUCCESS
)
934 if (scsi_try_bus_reset(scmd
) != SUCCESS
)
935 scsi_try_host_reset(scmd
);
939 * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery
940 * @scmd: SCSI command structure to hijack
941 * @ses: structure to save restore information
942 * @cmnd: CDB to send. Can be NULL if no new cmnd is needed
943 * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB)
944 * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
946 * This function is used to save a scsi command information before re-execution
947 * as part of the error recovery process. If @sense_bytes is 0 the command
948 * sent must be one that does not transfer any data. If @sense_bytes != 0
949 * @cmnd is ignored and this functions sets up a REQUEST_SENSE command
950 * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer.
952 void scsi_eh_prep_cmnd(struct scsi_cmnd
*scmd
, struct scsi_eh_save
*ses
,
953 unsigned char *cmnd
, int cmnd_size
, unsigned sense_bytes
)
955 struct scsi_device
*sdev
= scmd
->device
;
958 * We need saved copies of a number of fields - this is because
959 * error handling may need to overwrite these with different values
960 * to run different commands, and once error handling is complete,
961 * we will need to restore these values prior to running the actual
964 ses
->cmd_len
= scmd
->cmd_len
;
965 ses
->cmnd
= scmd
->cmnd
;
966 ses
->data_direction
= scmd
->sc_data_direction
;
967 ses
->sdb
= scmd
->sdb
;
968 ses
->result
= scmd
->result
;
969 ses
->underflow
= scmd
->underflow
;
970 ses
->prot_op
= scmd
->prot_op
;
971 ses
->eh_eflags
= scmd
->eh_eflags
;
973 scmd
->prot_op
= SCSI_PROT_NORMAL
;
975 scmd
->cmnd
= ses
->eh_cmnd
;
976 memset(scmd
->cmnd
, 0, BLK_MAX_CDB
);
977 memset(&scmd
->sdb
, 0, sizeof(scmd
->sdb
));
981 scmd
->sdb
.length
= min_t(unsigned, SCSI_SENSE_BUFFERSIZE
,
983 sg_init_one(&ses
->sense_sgl
, scmd
->sense_buffer
,
985 scmd
->sdb
.table
.sgl
= &ses
->sense_sgl
;
986 scmd
->sc_data_direction
= DMA_FROM_DEVICE
;
987 scmd
->sdb
.table
.nents
= scmd
->sdb
.table
.orig_nents
= 1;
988 scmd
->cmnd
[0] = REQUEST_SENSE
;
989 scmd
->cmnd
[4] = scmd
->sdb
.length
;
990 scmd
->cmd_len
= COMMAND_SIZE(scmd
->cmnd
[0]);
992 scmd
->sc_data_direction
= DMA_NONE
;
994 BUG_ON(cmnd_size
> BLK_MAX_CDB
);
995 memcpy(scmd
->cmnd
, cmnd
, cmnd_size
);
996 scmd
->cmd_len
= COMMAND_SIZE(scmd
->cmnd
[0]);
1000 scmd
->underflow
= 0;
1002 if (sdev
->scsi_level
<= SCSI_2
&& sdev
->scsi_level
!= SCSI_UNKNOWN
)
1003 scmd
->cmnd
[1] = (scmd
->cmnd
[1] & 0x1f) |
1004 (sdev
->lun
<< 5 & 0xe0);
1007 * Zero the sense buffer. The scsi spec mandates that any
1008 * untransferred sense data should be interpreted as being zero.
1010 memset(scmd
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
1012 EXPORT_SYMBOL(scsi_eh_prep_cmnd
);
1015 * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery
1016 * @scmd: SCSI command structure to restore
1017 * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd
1019 * Undo any damage done by above scsi_eh_prep_cmnd().
1021 void scsi_eh_restore_cmnd(struct scsi_cmnd
* scmd
, struct scsi_eh_save
*ses
)
1024 * Restore original data
1026 scmd
->cmd_len
= ses
->cmd_len
;
1027 scmd
->cmnd
= ses
->cmnd
;
1028 scmd
->sc_data_direction
= ses
->data_direction
;
1029 scmd
->sdb
= ses
->sdb
;
1030 scmd
->result
= ses
->result
;
1031 scmd
->underflow
= ses
->underflow
;
1032 scmd
->prot_op
= ses
->prot_op
;
1033 scmd
->eh_eflags
= ses
->eh_eflags
;
1035 EXPORT_SYMBOL(scsi_eh_restore_cmnd
);
1038 * scsi_send_eh_cmnd - submit a scsi command as part of error recovery
1039 * @scmd: SCSI command structure to hijack
1040 * @cmnd: CDB to send
1041 * @cmnd_size: size in bytes of @cmnd
1042 * @timeout: timeout for this request
1043 * @sense_bytes: size of sense data to copy or 0
1045 * This function is used to send a scsi command down to a target device
1046 * as part of the error recovery process. See also scsi_eh_prep_cmnd() above.
1049 * SUCCESS or FAILED or NEEDS_RETRY
1051 static int scsi_send_eh_cmnd(struct scsi_cmnd
*scmd
, unsigned char *cmnd
,
1052 int cmnd_size
, int timeout
, unsigned sense_bytes
)
1054 struct scsi_device
*sdev
= scmd
->device
;
1055 struct Scsi_Host
*shost
= sdev
->host
;
1056 DECLARE_COMPLETION_ONSTACK(done
);
1057 unsigned long timeleft
= timeout
;
1058 struct scsi_eh_save ses
;
1059 const unsigned long stall_for
= msecs_to_jiffies(100);
1063 scsi_eh_prep_cmnd(scmd
, &ses
, cmnd
, cmnd_size
, sense_bytes
);
1064 shost
->eh_action
= &done
;
1066 scsi_log_send(scmd
);
1067 scmd
->scsi_done
= scsi_eh_done
;
1068 rtn
= shost
->hostt
->queuecommand(shost
, scmd
);
1070 if (timeleft
> stall_for
) {
1071 scsi_eh_restore_cmnd(scmd
, &ses
);
1072 timeleft
-= stall_for
;
1073 msleep(jiffies_to_msecs(stall_for
));
1076 /* signal not to enter either branch of the if () below */
1080 timeleft
= wait_for_completion_timeout(&done
, timeout
);
1084 shost
->eh_action
= NULL
;
1086 scsi_log_completion(scmd
, rtn
);
1088 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO
, scmd
,
1089 "%s timeleft: %ld\n",
1090 __func__
, timeleft
));
1093 * If there is time left scsi_eh_done got called, and we will examine
1094 * the actual status codes to see whether the command actually did
1095 * complete normally, else if we have a zero return and no time left,
1096 * the command must still be pending, so abort it and return FAILED.
1097 * If we never actually managed to issue the command, because
1098 * ->queuecommand() kept returning non zero, use the rtn = FAILED
1099 * value above (so don't execute either branch of the if)
1102 rtn
= scsi_eh_completed_normally(scmd
);
1103 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO
, scmd
,
1104 "%s: scsi_eh_completed_normally %x\n", __func__
, rtn
));
1111 case ADD_TO_MLQUEUE
:
1118 } else if (rtn
!= FAILED
) {
1119 scsi_abort_eh_cmnd(scmd
);
1123 scsi_eh_restore_cmnd(scmd
, &ses
);
1129 * scsi_request_sense - Request sense data from a particular target.
1130 * @scmd: SCSI cmd for request sense.
1133 * Some hosts automatically obtain this information, others require
1134 * that we obtain it on our own. This function will *not* return until
1135 * the command either times out, or it completes.
1137 static int scsi_request_sense(struct scsi_cmnd
*scmd
)
1139 return scsi_send_eh_cmnd(scmd
, NULL
, 0, scmd
->device
->eh_timeout
, ~0);
1142 static int scsi_eh_action(struct scsi_cmnd
*scmd
, int rtn
)
1144 if (!blk_rq_is_passthrough(scmd
->request
)) {
1145 struct scsi_driver
*sdrv
= scsi_cmd_to_driver(scmd
);
1146 if (sdrv
->eh_action
)
1147 rtn
= sdrv
->eh_action(scmd
, rtn
);
1153 * scsi_eh_finish_cmd - Handle a cmd that eh is finished with.
1154 * @scmd: Original SCSI cmd that eh has finished.
1155 * @done_q: Queue for processed commands.
1158 * We don't want to use the normal command completion while we are are
1159 * still handling errors - it may cause other commands to be queued,
1160 * and that would disturb what we are doing. Thus we really want to
1161 * keep a list of pending commands for final completion, and once we
1162 * are ready to leave error handling we handle completion for real.
1164 void scsi_eh_finish_cmd(struct scsi_cmnd
*scmd
, struct list_head
*done_q
)
1166 list_move_tail(&scmd
->eh_entry
, done_q
);
1168 EXPORT_SYMBOL(scsi_eh_finish_cmd
);
1171 * scsi_eh_get_sense - Get device sense data.
1172 * @work_q: Queue of commands to process.
1173 * @done_q: Queue of processed commands.
1176 * See if we need to request sense information. if so, then get it
1177 * now, so we have a better idea of what to do.
1180 * This has the unfortunate side effect that if a shost adapter does
1181 * not automatically request sense information, we end up shutting
1182 * it down before we request it.
1184 * All drivers should request sense information internally these days,
1185 * so for now all I have to say is tough noogies if you end up in here.
1187 * XXX: Long term this code should go away, but that needs an audit of
1190 int scsi_eh_get_sense(struct list_head
*work_q
,
1191 struct list_head
*done_q
)
1193 struct scsi_cmnd
*scmd
, *next
;
1194 struct Scsi_Host
*shost
;
1198 * If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO,
1199 * should not get sense.
1201 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1202 if ((scmd
->eh_eflags
& SCSI_EH_ABORT_SCHEDULED
) ||
1203 SCSI_SENSE_VALID(scmd
))
1206 shost
= scmd
->device
->host
;
1207 if (scsi_host_eh_past_deadline(shost
)) {
1208 SCSI_LOG_ERROR_RECOVERY(3,
1209 scmd_printk(KERN_INFO
, scmd
,
1210 "%s: skip request sense, past eh deadline\n",
1214 if (status_byte(scmd
->result
) != CHECK_CONDITION
)
1216 * don't request sense if there's no check condition
1217 * status because the error we're processing isn't one
1218 * that has a sense code (and some devices get
1219 * confused by sense requests out of the blue)
1223 SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO
, scmd
,
1224 "%s: requesting sense\n",
1226 rtn
= scsi_request_sense(scmd
);
1230 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO
, scmd
,
1231 "sense requested, result %x\n", scmd
->result
));
1232 SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd
));
1234 rtn
= scsi_decide_disposition(scmd
);
1237 * if the result was normal, then just pass it along to the
1241 /* we don't want this command reissued, just
1242 * finished with the sense data, so set
1243 * retries to the max allowed to ensure it
1244 * won't get reissued */
1245 scmd
->retries
= scmd
->allowed
;
1246 else if (rtn
!= NEEDS_RETRY
)
1249 scsi_eh_finish_cmd(scmd
, done_q
);
1252 return list_empty(work_q
);
1254 EXPORT_SYMBOL_GPL(scsi_eh_get_sense
);
1257 * scsi_eh_tur - Send TUR to device.
1258 * @scmd: &scsi_cmnd to send TUR
1261 * 0 - Device is ready. 1 - Device NOT ready.
1263 static int scsi_eh_tur(struct scsi_cmnd
*scmd
)
1265 static unsigned char tur_command
[6] = {TEST_UNIT_READY
, 0, 0, 0, 0, 0};
1266 int retry_cnt
= 1, rtn
;
1269 rtn
= scsi_send_eh_cmnd(scmd
, tur_command
, 6,
1270 scmd
->device
->eh_timeout
, 0);
1272 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO
, scmd
,
1273 "%s return: %x\n", __func__
, rtn
));
1288 * scsi_eh_test_devices - check if devices are responding from error recovery.
1289 * @cmd_list: scsi commands in error recovery.
1290 * @work_q: queue for commands which still need more error recovery
1291 * @done_q: queue for commands which are finished
1292 * @try_stu: boolean on if a STU command should be tried in addition to TUR.
1295 * Tests if devices are in a working state. Commands to devices now in
1296 * a working state are sent to the done_q while commands to devices which
1297 * are still failing to respond are returned to the work_q for more
1300 static int scsi_eh_test_devices(struct list_head
*cmd_list
,
1301 struct list_head
*work_q
,
1302 struct list_head
*done_q
, int try_stu
)
1304 struct scsi_cmnd
*scmd
, *next
;
1305 struct scsi_device
*sdev
;
1308 while (!list_empty(cmd_list
)) {
1309 scmd
= list_entry(cmd_list
->next
, struct scsi_cmnd
, eh_entry
);
1310 sdev
= scmd
->device
;
1313 if (scsi_host_eh_past_deadline(sdev
->host
)) {
1314 /* Push items back onto work_q */
1315 list_splice_init(cmd_list
, work_q
);
1316 SCSI_LOG_ERROR_RECOVERY(3,
1317 sdev_printk(KERN_INFO
, sdev
,
1318 "%s: skip test device, past eh deadline",
1324 finish_cmds
= !scsi_device_online(scmd
->device
) ||
1325 (try_stu
&& !scsi_eh_try_stu(scmd
) &&
1326 !scsi_eh_tur(scmd
)) ||
1329 list_for_each_entry_safe(scmd
, next
, cmd_list
, eh_entry
)
1330 if (scmd
->device
== sdev
) {
1333 scsi_eh_action(scmd
, SUCCESS
) == SUCCESS
))
1334 scsi_eh_finish_cmd(scmd
, done_q
);
1336 list_move_tail(&scmd
->eh_entry
, work_q
);
1339 return list_empty(work_q
);
1343 * scsi_eh_try_stu - Send START_UNIT to device.
1344 * @scmd: &scsi_cmnd to send START_UNIT
1347 * 0 - Device is ready. 1 - Device NOT ready.
1349 static int scsi_eh_try_stu(struct scsi_cmnd
*scmd
)
1351 static unsigned char stu_command
[6] = {START_STOP
, 0, 0, 0, 1, 0};
1353 if (scmd
->device
->allow_restart
) {
1354 int i
, rtn
= NEEDS_RETRY
;
1356 for (i
= 0; rtn
== NEEDS_RETRY
&& i
< 2; i
++)
1357 rtn
= scsi_send_eh_cmnd(scmd
, stu_command
, 6, scmd
->device
->request_queue
->rq_timeout
, 0);
1367 * scsi_eh_stu - send START_UNIT if needed
1368 * @shost: &scsi host being recovered.
1369 * @work_q: &list_head for pending commands.
1370 * @done_q: &list_head for processed commands.
1373 * If commands are failing due to not ready, initializing command required,
1374 * try revalidating the device, which will end up sending a start unit.
1376 static int scsi_eh_stu(struct Scsi_Host
*shost
,
1377 struct list_head
*work_q
,
1378 struct list_head
*done_q
)
1380 struct scsi_cmnd
*scmd
, *stu_scmd
, *next
;
1381 struct scsi_device
*sdev
;
1383 shost_for_each_device(sdev
, shost
) {
1384 if (scsi_host_eh_past_deadline(shost
)) {
1385 SCSI_LOG_ERROR_RECOVERY(3,
1386 sdev_printk(KERN_INFO
, sdev
,
1387 "%s: skip START_UNIT, past eh deadline\n",
1392 list_for_each_entry(scmd
, work_q
, eh_entry
)
1393 if (scmd
->device
== sdev
&& SCSI_SENSE_VALID(scmd
) &&
1394 scsi_check_sense(scmd
) == FAILED
) {
1402 SCSI_LOG_ERROR_RECOVERY(3,
1403 sdev_printk(KERN_INFO
, sdev
,
1404 "%s: Sending START_UNIT\n",
1407 if (!scsi_eh_try_stu(stu_scmd
)) {
1408 if (!scsi_device_online(sdev
) ||
1409 !scsi_eh_tur(stu_scmd
)) {
1410 list_for_each_entry_safe(scmd
, next
,
1412 if (scmd
->device
== sdev
&&
1413 scsi_eh_action(scmd
, SUCCESS
) == SUCCESS
)
1414 scsi_eh_finish_cmd(scmd
, done_q
);
1418 SCSI_LOG_ERROR_RECOVERY(3,
1419 sdev_printk(KERN_INFO
, sdev
,
1420 "%s: START_UNIT failed\n",
1425 return list_empty(work_q
);
1430 * scsi_eh_bus_device_reset - send bdr if needed
1431 * @shost: scsi host being recovered.
1432 * @work_q: &list_head for pending commands.
1433 * @done_q: &list_head for processed commands.
1436 * Try a bus device reset. Still, look to see whether we have multiple
1437 * devices that are jammed or not - if we have multiple devices, it
1438 * makes no sense to try bus_device_reset - we really would need to try
1439 * a bus_reset instead.
1441 static int scsi_eh_bus_device_reset(struct Scsi_Host
*shost
,
1442 struct list_head
*work_q
,
1443 struct list_head
*done_q
)
1445 struct scsi_cmnd
*scmd
, *bdr_scmd
, *next
;
1446 struct scsi_device
*sdev
;
1449 shost_for_each_device(sdev
, shost
) {
1450 if (scsi_host_eh_past_deadline(shost
)) {
1451 SCSI_LOG_ERROR_RECOVERY(3,
1452 sdev_printk(KERN_INFO
, sdev
,
1453 "%s: skip BDR, past eh deadline\n",
1458 list_for_each_entry(scmd
, work_q
, eh_entry
)
1459 if (scmd
->device
== sdev
) {
1467 SCSI_LOG_ERROR_RECOVERY(3,
1468 sdev_printk(KERN_INFO
, sdev
,
1469 "%s: Sending BDR\n", current
->comm
));
1470 rtn
= scsi_try_bus_device_reset(bdr_scmd
);
1471 if (rtn
== SUCCESS
|| rtn
== FAST_IO_FAIL
) {
1472 if (!scsi_device_online(sdev
) ||
1473 rtn
== FAST_IO_FAIL
||
1474 !scsi_eh_tur(bdr_scmd
)) {
1475 list_for_each_entry_safe(scmd
, next
,
1477 if (scmd
->device
== sdev
&&
1478 scsi_eh_action(scmd
, rtn
) != FAILED
)
1479 scsi_eh_finish_cmd(scmd
,
1484 SCSI_LOG_ERROR_RECOVERY(3,
1485 sdev_printk(KERN_INFO
, sdev
,
1486 "%s: BDR failed\n", current
->comm
));
1490 return list_empty(work_q
);
1494 * scsi_eh_target_reset - send target reset if needed
1495 * @shost: scsi host being recovered.
1496 * @work_q: &list_head for pending commands.
1497 * @done_q: &list_head for processed commands.
1500 * Try a target reset.
1502 static int scsi_eh_target_reset(struct Scsi_Host
*shost
,
1503 struct list_head
*work_q
,
1504 struct list_head
*done_q
)
1506 LIST_HEAD(tmp_list
);
1507 LIST_HEAD(check_list
);
1509 list_splice_init(work_q
, &tmp_list
);
1511 while (!list_empty(&tmp_list
)) {
1512 struct scsi_cmnd
*next
, *scmd
;
1516 if (scsi_host_eh_past_deadline(shost
)) {
1517 /* push back on work queue for further processing */
1518 list_splice_init(&check_list
, work_q
);
1519 list_splice_init(&tmp_list
, work_q
);
1520 SCSI_LOG_ERROR_RECOVERY(3,
1521 shost_printk(KERN_INFO
, shost
,
1522 "%s: Skip target reset, past eh deadline\n",
1524 return list_empty(work_q
);
1527 scmd
= list_entry(tmp_list
.next
, struct scsi_cmnd
, eh_entry
);
1530 SCSI_LOG_ERROR_RECOVERY(3,
1531 shost_printk(KERN_INFO
, shost
,
1532 "%s: Sending target reset to target %d\n",
1533 current
->comm
, id
));
1534 rtn
= scsi_try_target_reset(scmd
);
1535 if (rtn
!= SUCCESS
&& rtn
!= FAST_IO_FAIL
)
1536 SCSI_LOG_ERROR_RECOVERY(3,
1537 shost_printk(KERN_INFO
, shost
,
1538 "%s: Target reset failed"
1540 current
->comm
, id
));
1541 list_for_each_entry_safe(scmd
, next
, &tmp_list
, eh_entry
) {
1542 if (scmd_id(scmd
) != id
)
1546 list_move_tail(&scmd
->eh_entry
, &check_list
);
1547 else if (rtn
== FAST_IO_FAIL
)
1548 scsi_eh_finish_cmd(scmd
, done_q
);
1550 /* push back on work queue for further processing */
1551 list_move(&scmd
->eh_entry
, work_q
);
1555 return scsi_eh_test_devices(&check_list
, work_q
, done_q
, 0);
1559 * scsi_eh_bus_reset - send a bus reset
1560 * @shost: &scsi host being recovered.
1561 * @work_q: &list_head for pending commands.
1562 * @done_q: &list_head for processed commands.
1564 static int scsi_eh_bus_reset(struct Scsi_Host
*shost
,
1565 struct list_head
*work_q
,
1566 struct list_head
*done_q
)
1568 struct scsi_cmnd
*scmd
, *chan_scmd
, *next
;
1569 LIST_HEAD(check_list
);
1570 unsigned int channel
;
1574 * we really want to loop over the various channels, and do this on
1575 * a channel by channel basis. we should also check to see if any
1576 * of the failed commands are on soft_reset devices, and if so, skip
1580 for (channel
= 0; channel
<= shost
->max_channel
; channel
++) {
1581 if (scsi_host_eh_past_deadline(shost
)) {
1582 list_splice_init(&check_list
, work_q
);
1583 SCSI_LOG_ERROR_RECOVERY(3,
1584 shost_printk(KERN_INFO
, shost
,
1585 "%s: skip BRST, past eh deadline\n",
1587 return list_empty(work_q
);
1591 list_for_each_entry(scmd
, work_q
, eh_entry
) {
1592 if (channel
== scmd_channel(scmd
)) {
1596 * FIXME add back in some support for
1597 * soft_reset devices.
1604 SCSI_LOG_ERROR_RECOVERY(3,
1605 shost_printk(KERN_INFO
, shost
,
1606 "%s: Sending BRST chan: %d\n",
1607 current
->comm
, channel
));
1608 rtn
= scsi_try_bus_reset(chan_scmd
);
1609 if (rtn
== SUCCESS
|| rtn
== FAST_IO_FAIL
) {
1610 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1611 if (channel
== scmd_channel(scmd
)) {
1612 if (rtn
== FAST_IO_FAIL
)
1613 scsi_eh_finish_cmd(scmd
,
1616 list_move_tail(&scmd
->eh_entry
,
1621 SCSI_LOG_ERROR_RECOVERY(3,
1622 shost_printk(KERN_INFO
, shost
,
1623 "%s: BRST failed chan: %d\n",
1624 current
->comm
, channel
));
1627 return scsi_eh_test_devices(&check_list
, work_q
, done_q
, 0);
1631 * scsi_eh_host_reset - send a host reset
1632 * @shost: host to be reset.
1633 * @work_q: &list_head for pending commands.
1634 * @done_q: &list_head for processed commands.
1636 static int scsi_eh_host_reset(struct Scsi_Host
*shost
,
1637 struct list_head
*work_q
,
1638 struct list_head
*done_q
)
1640 struct scsi_cmnd
*scmd
, *next
;
1641 LIST_HEAD(check_list
);
1644 if (!list_empty(work_q
)) {
1645 scmd
= list_entry(work_q
->next
,
1646 struct scsi_cmnd
, eh_entry
);
1648 SCSI_LOG_ERROR_RECOVERY(3,
1649 shost_printk(KERN_INFO
, shost
,
1650 "%s: Sending HRST\n",
1653 rtn
= scsi_try_host_reset(scmd
);
1654 if (rtn
== SUCCESS
) {
1655 list_splice_init(work_q
, &check_list
);
1656 } else if (rtn
== FAST_IO_FAIL
) {
1657 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1658 scsi_eh_finish_cmd(scmd
, done_q
);
1661 SCSI_LOG_ERROR_RECOVERY(3,
1662 shost_printk(KERN_INFO
, shost
,
1663 "%s: HRST failed\n",
1667 return scsi_eh_test_devices(&check_list
, work_q
, done_q
, 1);
1671 * scsi_eh_offline_sdevs - offline scsi devices that fail to recover
1672 * @work_q: &list_head for pending commands.
1673 * @done_q: &list_head for processed commands.
1675 static void scsi_eh_offline_sdevs(struct list_head
*work_q
,
1676 struct list_head
*done_q
)
1678 struct scsi_cmnd
*scmd
, *next
;
1679 struct scsi_device
*sdev
;
1681 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1682 sdev_printk(KERN_INFO
, scmd
->device
, "Device offlined - "
1683 "not ready after error recovery\n");
1684 sdev
= scmd
->device
;
1686 mutex_lock(&sdev
->state_mutex
);
1687 scsi_device_set_state(sdev
, SDEV_OFFLINE
);
1688 mutex_unlock(&sdev
->state_mutex
);
1690 scsi_eh_finish_cmd(scmd
, done_q
);
1696 * scsi_noretry_cmd - determine if command should be failed fast
1697 * @scmd: SCSI cmd to examine.
1699 int scsi_noretry_cmd(struct scsi_cmnd
*scmd
)
1701 switch (host_byte(scmd
->result
)) {
1707 return (scmd
->request
->cmd_flags
& REQ_FAILFAST_TRANSPORT
);
1709 return (scmd
->request
->cmd_flags
& REQ_FAILFAST_DEV
);
1711 if (msg_byte(scmd
->result
) == COMMAND_COMPLETE
&&
1712 status_byte(scmd
->result
) == RESERVATION_CONFLICT
)
1715 case DID_SOFT_ERROR
:
1716 return (scmd
->request
->cmd_flags
& REQ_FAILFAST_DRIVER
);
1719 if (status_byte(scmd
->result
) != CHECK_CONDITION
)
1724 * assume caller has checked sense and determined
1725 * the check condition was retryable.
1727 if (scmd
->request
->cmd_flags
& REQ_FAILFAST_DEV
||
1728 blk_rq_is_passthrough(scmd
->request
))
1735 * scsi_decide_disposition - Disposition a cmd on return from LLD.
1736 * @scmd: SCSI cmd to examine.
1739 * This is *only* called when we are examining the status after sending
1740 * out the actual data command. any commands that are queued for error
1741 * recovery (e.g. test_unit_ready) do *not* come through here.
1743 * When this routine returns failed, it means the error handler thread
1744 * is woken. In cases where the error code indicates an error that
1745 * doesn't require the error handler read (i.e. we don't need to
1746 * abort/reset), this function should return SUCCESS.
1748 int scsi_decide_disposition(struct scsi_cmnd
*scmd
)
1753 * if the device is offline, then we clearly just pass the result back
1754 * up to the top level.
1756 if (!scsi_device_online(scmd
->device
)) {
1757 SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO
, scmd
,
1758 "%s: device offline - report as SUCCESS\n", __func__
));
1763 * first check the host byte, to see if there is anything in there
1764 * that would indicate what we need to do.
1766 switch (host_byte(scmd
->result
)) {
1767 case DID_PASSTHROUGH
:
1769 * no matter what, pass this through to the upper layer.
1770 * nuke this special code so that it looks like we are saying
1773 scmd
->result
&= 0xff00ffff;
1777 * looks good. drop through, and check the next byte.
1781 if (scmd
->eh_eflags
& SCSI_EH_ABORT_SCHEDULED
) {
1782 set_host_byte(scmd
, DID_TIME_OUT
);
1786 case DID_NO_CONNECT
:
1787 case DID_BAD_TARGET
:
1789 * note - this means that we just report the status back
1790 * to the top level driver, not that we actually think
1791 * that it indicates SUCCESS.
1794 case DID_SOFT_ERROR
:
1796 * when the low level driver returns did_soft_error,
1797 * it is responsible for keeping an internal retry counter
1798 * in order to avoid endless loops (db)
1805 return ADD_TO_MLQUEUE
;
1806 case DID_TRANSPORT_DISRUPTED
:
1808 * LLD/transport was disrupted during processing of the IO.
1809 * The transport class is now blocked/blocking,
1810 * and the transport will decide what to do with the IO
1811 * based on its timers and recovery capablilities if
1812 * there are enough retries.
1815 case DID_TRANSPORT_FAILFAST
:
1817 * The transport decided to failfast the IO (most likely
1818 * the fast io fail tmo fired), so send IO directly upwards.
1822 if (msg_byte(scmd
->result
) == COMMAND_COMPLETE
&&
1823 status_byte(scmd
->result
) == RESERVATION_CONFLICT
)
1825 * execute reservation conflict processing code
1835 * when we scan the bus, we get timeout messages for
1836 * these commands if there is no device available.
1837 * other hosts report did_no_connect for the same thing.
1839 if ((scmd
->cmnd
[0] == TEST_UNIT_READY
||
1840 scmd
->cmnd
[0] == INQUIRY
)) {
1852 * next, check the message byte.
1854 if (msg_byte(scmd
->result
) != COMMAND_COMPLETE
)
1858 * check the status byte to see if this indicates anything special.
1860 switch (status_byte(scmd
->result
)) {
1862 scsi_handle_queue_full(scmd
->device
);
1864 * the case of trying to send too many commands to a
1865 * tagged queueing device.
1870 * device can't talk to us at the moment. Should only
1871 * occur (SAM-3) when the task queue is empty, so will cause
1872 * the empty queue handling to trigger a stall in the
1875 return ADD_TO_MLQUEUE
;
1877 if (scmd
->cmnd
[0] == REPORT_LUNS
)
1878 scmd
->device
->sdev_target
->expecting_lun_change
= 0;
1879 scsi_handle_queue_ramp_up(scmd
->device
);
1881 case COMMAND_TERMINATED
:
1885 case CHECK_CONDITION
:
1886 rtn
= scsi_check_sense(scmd
);
1887 if (rtn
== NEEDS_RETRY
)
1889 /* if rtn == FAILED, we have no sense information;
1890 * returning FAILED will wake the error handler thread
1891 * to collect the sense and redo the decide
1894 case CONDITION_GOOD
:
1895 case INTERMEDIATE_GOOD
:
1896 case INTERMEDIATE_C_GOOD
:
1899 * who knows? FIXME(eric)
1903 case RESERVATION_CONFLICT
:
1904 sdev_printk(KERN_INFO
, scmd
->device
,
1905 "reservation conflict\n");
1906 set_host_byte(scmd
, DID_NEXUS_FAILURE
);
1907 return SUCCESS
; /* causes immediate i/o error */
1915 /* we requeue for retry because the error was retryable, and
1916 * the request was not marked fast fail. Note that above,
1917 * even if the request is marked fast fail, we still requeue
1918 * for queue congestion conditions (QUEUE_FULL or BUSY) */
1919 if ((++scmd
->retries
) <= scmd
->allowed
1920 && !scsi_noretry_cmd(scmd
)) {
1924 * no more retries - report this one back to upper level.
1930 static void eh_lock_door_done(struct request
*req
, blk_status_t status
)
1932 blk_put_request(req
);
1936 * scsi_eh_lock_door - Prevent medium removal for the specified device
1937 * @sdev: SCSI device to prevent medium removal
1940 * We must be called from process context.
1943 * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the
1944 * head of the devices request queue, and continue.
1946 static void scsi_eh_lock_door(struct scsi_device
*sdev
)
1948 struct request
*req
;
1949 struct scsi_request
*rq
;
1951 req
= blk_get_request(sdev
->request_queue
, REQ_OP_SCSI_IN
, 0);
1956 rq
->cmd
[0] = ALLOW_MEDIUM_REMOVAL
;
1960 rq
->cmd
[4] = SCSI_REMOVAL_PREVENT
;
1962 rq
->cmd_len
= COMMAND_SIZE(rq
->cmd
[0]);
1964 req
->rq_flags
|= RQF_QUIET
;
1965 req
->timeout
= 10 * HZ
;
1968 blk_execute_rq_nowait(req
->q
, NULL
, req
, 1, eh_lock_door_done
);
1972 * scsi_restart_operations - restart io operations to the specified host.
1973 * @shost: Host we are restarting.
1976 * When we entered the error handler, we blocked all further i/o to
1977 * this device. we need to 'reverse' this process.
1979 static void scsi_restart_operations(struct Scsi_Host
*shost
)
1981 struct scsi_device
*sdev
;
1982 unsigned long flags
;
1985 * If the door was locked, we need to insert a door lock request
1986 * onto the head of the SCSI request queue for the device. There
1987 * is no point trying to lock the door of an off-line device.
1989 shost_for_each_device(sdev
, shost
) {
1990 if (scsi_device_online(sdev
) && sdev
->was_reset
&& sdev
->locked
) {
1991 scsi_eh_lock_door(sdev
);
1992 sdev
->was_reset
= 0;
1997 * next free up anything directly waiting upon the host. this
1998 * will be requests for character device operations, and also for
1999 * ioctls to queued block devices.
2001 SCSI_LOG_ERROR_RECOVERY(3,
2002 shost_printk(KERN_INFO
, shost
, "waking up host to restart\n"));
2004 spin_lock_irqsave(shost
->host_lock
, flags
);
2005 if (scsi_host_set_state(shost
, SHOST_RUNNING
))
2006 if (scsi_host_set_state(shost
, SHOST_CANCEL
))
2007 BUG_ON(scsi_host_set_state(shost
, SHOST_DEL
));
2008 spin_unlock_irqrestore(shost
->host_lock
, flags
);
2010 wake_up(&shost
->host_wait
);
2013 * finally we need to re-initiate requests that may be pending. we will
2014 * have had everything blocked while error handling is taking place, and
2015 * now that error recovery is done, we will need to ensure that these
2016 * requests are started.
2018 scsi_run_host_queues(shost
);
2021 * if eh is active and host_eh_scheduled is pending we need to re-run
2022 * recovery. we do this check after scsi_run_host_queues() to allow
2023 * everything pent up since the last eh run a chance to make forward
2024 * progress before we sync again. Either we'll immediately re-run
2025 * recovery or scsi_device_unbusy() will wake us again when these
2026 * pending commands complete.
2028 spin_lock_irqsave(shost
->host_lock
, flags
);
2029 if (shost
->host_eh_scheduled
)
2030 if (scsi_host_set_state(shost
, SHOST_RECOVERY
))
2031 WARN_ON(scsi_host_set_state(shost
, SHOST_CANCEL_RECOVERY
));
2032 spin_unlock_irqrestore(shost
->host_lock
, flags
);
2036 * scsi_eh_ready_devs - check device ready state and recover if not.
2037 * @shost: host to be recovered.
2038 * @work_q: &list_head for pending commands.
2039 * @done_q: &list_head for processed commands.
2041 void scsi_eh_ready_devs(struct Scsi_Host
*shost
,
2042 struct list_head
*work_q
,
2043 struct list_head
*done_q
)
2045 if (!scsi_eh_stu(shost
, work_q
, done_q
))
2046 if (!scsi_eh_bus_device_reset(shost
, work_q
, done_q
))
2047 if (!scsi_eh_target_reset(shost
, work_q
, done_q
))
2048 if (!scsi_eh_bus_reset(shost
, work_q
, done_q
))
2049 if (!scsi_eh_host_reset(shost
, work_q
, done_q
))
2050 scsi_eh_offline_sdevs(work_q
,
2053 EXPORT_SYMBOL_GPL(scsi_eh_ready_devs
);
2056 * scsi_eh_flush_done_q - finish processed commands or retry them.
2057 * @done_q: list_head of processed commands.
2059 void scsi_eh_flush_done_q(struct list_head
*done_q
)
2061 struct scsi_cmnd
*scmd
, *next
;
2063 list_for_each_entry_safe(scmd
, next
, done_q
, eh_entry
) {
2064 list_del_init(&scmd
->eh_entry
);
2065 if (scsi_device_online(scmd
->device
) &&
2066 !scsi_noretry_cmd(scmd
) &&
2067 (++scmd
->retries
<= scmd
->allowed
)) {
2068 SCSI_LOG_ERROR_RECOVERY(3,
2069 scmd_printk(KERN_INFO
, scmd
,
2070 "%s: flush retry cmd\n",
2072 scsi_queue_insert(scmd
, SCSI_MLQUEUE_EH_RETRY
);
2075 * If just we got sense for the device (called
2076 * scsi_eh_get_sense), scmd->result is already
2077 * set, do not set DRIVER_TIMEOUT.
2080 scmd
->result
|= (DRIVER_TIMEOUT
<< 24);
2081 SCSI_LOG_ERROR_RECOVERY(3,
2082 scmd_printk(KERN_INFO
, scmd
,
2083 "%s: flush finish cmd\n",
2085 scsi_finish_command(scmd
);
2089 EXPORT_SYMBOL(scsi_eh_flush_done_q
);
2092 * scsi_unjam_host - Attempt to fix a host which has a cmd that failed.
2093 * @shost: Host to unjam.
2096 * When we come in here, we *know* that all commands on the bus have
2097 * either completed, failed or timed out. we also know that no further
2098 * commands are being sent to the host, so things are relatively quiet
2099 * and we have freedom to fiddle with things as we wish.
2101 * This is only the *default* implementation. it is possible for
2102 * individual drivers to supply their own version of this function, and
2103 * if the maintainer wishes to do this, it is strongly suggested that
2104 * this function be taken as a template and modified. this function
2105 * was designed to correctly handle problems for about 95% of the
2106 * different cases out there, and it should always provide at least a
2107 * reasonable amount of error recovery.
2109 * Any command marked 'failed' or 'timeout' must eventually have
2110 * scsi_finish_cmd() called for it. we do all of the retry stuff
2111 * here, so when we restart the host after we return it should have an
2114 static void scsi_unjam_host(struct Scsi_Host
*shost
)
2116 unsigned long flags
;
2117 LIST_HEAD(eh_work_q
);
2118 LIST_HEAD(eh_done_q
);
2120 spin_lock_irqsave(shost
->host_lock
, flags
);
2121 list_splice_init(&shost
->eh_cmd_q
, &eh_work_q
);
2122 spin_unlock_irqrestore(shost
->host_lock
, flags
);
2124 SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost
, &eh_work_q
));
2126 if (!scsi_eh_get_sense(&eh_work_q
, &eh_done_q
))
2127 scsi_eh_ready_devs(shost
, &eh_work_q
, &eh_done_q
);
2129 spin_lock_irqsave(shost
->host_lock
, flags
);
2130 if (shost
->eh_deadline
!= -1)
2131 shost
->last_reset
= 0;
2132 spin_unlock_irqrestore(shost
->host_lock
, flags
);
2133 scsi_eh_flush_done_q(&eh_done_q
);
2137 * scsi_error_handler - SCSI error handler thread
2138 * @data: Host for which we are running.
2141 * This is the main error handling loop. This is run as a kernel thread
2142 * for every SCSI host and handles all error handling activity.
2144 int scsi_error_handler(void *data
)
2146 struct Scsi_Host
*shost
= data
;
2149 * We use TASK_INTERRUPTIBLE so that the thread is not
2150 * counted against the load average as a running process.
2151 * We never actually get interrupted because kthread_run
2152 * disables signal delivery for the created thread.
2156 * The sequence in kthread_stop() sets the stop flag first
2157 * then wakes the process. To avoid missed wakeups, the task
2158 * should always be in a non running state before the stop
2161 set_current_state(TASK_INTERRUPTIBLE
);
2162 if (kthread_should_stop())
2165 if ((shost
->host_failed
== 0 && shost
->host_eh_scheduled
== 0) ||
2166 shost
->host_failed
!= scsi_host_busy(shost
)) {
2167 SCSI_LOG_ERROR_RECOVERY(1,
2168 shost_printk(KERN_INFO
, shost
,
2169 "scsi_eh_%d: sleeping\n",
2175 __set_current_state(TASK_RUNNING
);
2176 SCSI_LOG_ERROR_RECOVERY(1,
2177 shost_printk(KERN_INFO
, shost
,
2178 "scsi_eh_%d: waking up %d/%d/%d\n",
2179 shost
->host_no
, shost
->host_eh_scheduled
,
2181 scsi_host_busy(shost
)));
2184 * We have a host that is failing for some reason. Figure out
2185 * what we need to do to get it up and online again (if we can).
2186 * If we fail, we end up taking the thing offline.
2188 if (!shost
->eh_noresume
&& scsi_autopm_get_host(shost
) != 0) {
2189 SCSI_LOG_ERROR_RECOVERY(1,
2190 shost_printk(KERN_ERR
, shost
,
2191 "scsi_eh_%d: unable to autoresume\n",
2196 if (shost
->transportt
->eh_strategy_handler
)
2197 shost
->transportt
->eh_strategy_handler(shost
);
2199 scsi_unjam_host(shost
);
2201 /* All scmds have been handled */
2202 shost
->host_failed
= 0;
2205 * Note - if the above fails completely, the action is to take
2206 * individual devices offline and flush the queue of any
2207 * outstanding requests that may have been pending. When we
2208 * restart, we restart any I/O to any other devices on the bus
2209 * which are still online.
2211 scsi_restart_operations(shost
);
2212 if (!shost
->eh_noresume
)
2213 scsi_autopm_put_host(shost
);
2215 __set_current_state(TASK_RUNNING
);
2217 SCSI_LOG_ERROR_RECOVERY(1,
2218 shost_printk(KERN_INFO
, shost
,
2219 "Error handler scsi_eh_%d exiting\n",
2221 shost
->ehandler
= NULL
;
2226 * Function: scsi_report_bus_reset()
2228 * Purpose: Utility function used by low-level drivers to report that
2229 * they have observed a bus reset on the bus being handled.
2231 * Arguments: shost - Host in question
2232 * channel - channel on which reset was observed.
2236 * Lock status: Host lock must be held.
2238 * Notes: This only needs to be called if the reset is one which
2239 * originates from an unknown location. Resets originated
2240 * by the mid-level itself don't need to call this, but there
2241 * should be no harm.
2243 * The main purpose of this is to make sure that a CHECK_CONDITION
2244 * is properly treated.
2246 void scsi_report_bus_reset(struct Scsi_Host
*shost
, int channel
)
2248 struct scsi_device
*sdev
;
2250 __shost_for_each_device(sdev
, shost
) {
2251 if (channel
== sdev_channel(sdev
))
2252 __scsi_report_device_reset(sdev
, NULL
);
2255 EXPORT_SYMBOL(scsi_report_bus_reset
);
2258 * Function: scsi_report_device_reset()
2260 * Purpose: Utility function used by low-level drivers to report that
2261 * they have observed a device reset on the device being handled.
2263 * Arguments: shost - Host in question
2264 * channel - channel on which reset was observed
2265 * target - target on which reset was observed
2269 * Lock status: Host lock must be held
2271 * Notes: This only needs to be called if the reset is one which
2272 * originates from an unknown location. Resets originated
2273 * by the mid-level itself don't need to call this, but there
2274 * should be no harm.
2276 * The main purpose of this is to make sure that a CHECK_CONDITION
2277 * is properly treated.
2279 void scsi_report_device_reset(struct Scsi_Host
*shost
, int channel
, int target
)
2281 struct scsi_device
*sdev
;
2283 __shost_for_each_device(sdev
, shost
) {
2284 if (channel
== sdev_channel(sdev
) &&
2285 target
== sdev_id(sdev
))
2286 __scsi_report_device_reset(sdev
, NULL
);
2289 EXPORT_SYMBOL(scsi_report_device_reset
);
2292 scsi_reset_provider_done_command(struct scsi_cmnd
*scmd
)
2297 * scsi_ioctl_reset: explicitly reset a host/bus/target/device
2298 * @dev: scsi_device to operate on
2299 * @arg: reset type (see sg.h)
2302 scsi_ioctl_reset(struct scsi_device
*dev
, int __user
*arg
)
2304 struct scsi_cmnd
*scmd
;
2305 struct Scsi_Host
*shost
= dev
->host
;
2307 unsigned long flags
;
2308 int error
= 0, rtn
, val
;
2310 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
2313 error
= get_user(val
, arg
);
2317 if (scsi_autopm_get_host(shost
) < 0)
2321 rq
= kzalloc(sizeof(struct request
) + sizeof(struct scsi_cmnd
) +
2322 shost
->hostt
->cmd_size
, GFP_KERNEL
);
2324 goto out_put_autopm_host
;
2325 blk_rq_init(NULL
, rq
);
2327 scmd
= (struct scsi_cmnd
*)(rq
+ 1);
2328 scsi_init_command(dev
, scmd
);
2330 scmd
->cmnd
= scsi_req(rq
)->cmd
;
2332 scmd
->scsi_done
= scsi_reset_provider_done_command
;
2333 memset(&scmd
->sdb
, 0, sizeof(scmd
->sdb
));
2337 scmd
->sc_data_direction
= DMA_BIDIRECTIONAL
;
2339 spin_lock_irqsave(shost
->host_lock
, flags
);
2340 shost
->tmf_in_progress
= 1;
2341 spin_unlock_irqrestore(shost
->host_lock
, flags
);
2343 switch (val
& ~SG_SCSI_RESET_NO_ESCALATE
) {
2344 case SG_SCSI_RESET_NOTHING
:
2347 case SG_SCSI_RESET_DEVICE
:
2348 rtn
= scsi_try_bus_device_reset(scmd
);
2349 if (rtn
== SUCCESS
|| (val
& SG_SCSI_RESET_NO_ESCALATE
))
2352 case SG_SCSI_RESET_TARGET
:
2353 rtn
= scsi_try_target_reset(scmd
);
2354 if (rtn
== SUCCESS
|| (val
& SG_SCSI_RESET_NO_ESCALATE
))
2357 case SG_SCSI_RESET_BUS
:
2358 rtn
= scsi_try_bus_reset(scmd
);
2359 if (rtn
== SUCCESS
|| (val
& SG_SCSI_RESET_NO_ESCALATE
))
2362 case SG_SCSI_RESET_HOST
:
2363 rtn
= scsi_try_host_reset(scmd
);
2372 error
= (rtn
== SUCCESS
) ? 0 : -EIO
;
2374 spin_lock_irqsave(shost
->host_lock
, flags
);
2375 shost
->tmf_in_progress
= 0;
2376 spin_unlock_irqrestore(shost
->host_lock
, flags
);
2379 * be sure to wake up anyone who was sleeping or had their queue
2380 * suspended while we performed the TMF.
2382 SCSI_LOG_ERROR_RECOVERY(3,
2383 shost_printk(KERN_INFO
, shost
,
2384 "waking up host to restart after TMF\n"));
2386 wake_up(&shost
->host_wait
);
2387 scsi_run_host_queues(shost
);
2389 scsi_put_command(scmd
);
2392 out_put_autopm_host
:
2393 scsi_autopm_put_host(shost
);
2397 bool scsi_command_normalize_sense(const struct scsi_cmnd
*cmd
,
2398 struct scsi_sense_hdr
*sshdr
)
2400 return scsi_normalize_sense(cmd
->sense_buffer
,
2401 SCSI_SENSE_BUFFERSIZE
, sshdr
);
2403 EXPORT_SYMBOL(scsi_command_normalize_sense
);
2406 * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format)
2407 * @sense_buffer: byte array of sense data
2408 * @sb_len: number of valid bytes in sense_buffer
2409 * @info_out: pointer to 64 integer where 8 or 4 byte information
2410 * field will be placed if found.
2413 * true if information field found, false if not found.
2415 bool scsi_get_sense_info_fld(const u8
*sense_buffer
, int sb_len
,
2422 switch (sense_buffer
[0] & 0x7f) {
2425 if (sense_buffer
[0] & 0x80) {
2426 *info_out
= get_unaligned_be32(&sense_buffer
[3]);
2432 ucp
= scsi_sense_desc_find(sense_buffer
, sb_len
,
2434 if (ucp
&& (0xa == ucp
[1])) {
2435 *info_out
= get_unaligned_be64(&ucp
[4]);
2443 EXPORT_SYMBOL(scsi_get_sense_info_fld
);