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/timer.h>
20 #include <linux/string.h>
21 #include <linux/slab.h>
22 #include <linux/kernel.h>
23 #include <linux/kthread.h>
24 #include <linux/interrupt.h>
25 #include <linux/blkdev.h>
26 #include <linux/delay.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_dbg.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_ioctl.h>
37 #include "scsi_priv.h"
38 #include "scsi_logging.h"
40 #define SENSE_TIMEOUT (10*HZ)
41 #define START_UNIT_TIMEOUT (30*HZ)
44 * These should *probably* be handled by the host itself.
45 * Since it is allowed to sleep, it probably should.
47 #define BUS_RESET_SETTLE_TIME (10)
48 #define HOST_RESET_SETTLE_TIME (10)
50 /* called with shost->host_lock held */
51 void scsi_eh_wakeup(struct Scsi_Host
*shost
)
53 if (shost
->host_busy
== shost
->host_failed
) {
54 wake_up_process(shost
->ehandler
);
55 SCSI_LOG_ERROR_RECOVERY(5,
56 printk("Waking error handler thread\n"));
61 * scsi_schedule_eh - schedule EH for SCSI host
62 * @shost: SCSI host to invoke error handling on.
64 * Schedule SCSI EH without scmd.
66 void scsi_schedule_eh(struct Scsi_Host
*shost
)
70 spin_lock_irqsave(shost
->host_lock
, flags
);
72 if (scsi_host_set_state(shost
, SHOST_RECOVERY
) == 0 ||
73 scsi_host_set_state(shost
, SHOST_CANCEL_RECOVERY
) == 0) {
74 shost
->host_eh_scheduled
++;
75 scsi_eh_wakeup(shost
);
78 spin_unlock_irqrestore(shost
->host_lock
, flags
);
80 EXPORT_SYMBOL_GPL(scsi_schedule_eh
);
83 * scsi_eh_scmd_add - add scsi cmd to error handling.
84 * @scmd: scmd to run eh on.
85 * @eh_flag: optional SCSI_EH flag.
90 int scsi_eh_scmd_add(struct scsi_cmnd
*scmd
, int eh_flag
)
92 struct Scsi_Host
*shost
= scmd
->device
->host
;
99 spin_lock_irqsave(shost
->host_lock
, flags
);
100 if (scsi_host_set_state(shost
, SHOST_RECOVERY
))
101 if (scsi_host_set_state(shost
, SHOST_CANCEL_RECOVERY
))
105 scmd
->eh_eflags
|= eh_flag
;
106 list_add_tail(&scmd
->eh_entry
, &shost
->eh_cmd_q
);
107 shost
->host_failed
++;
108 scsi_eh_wakeup(shost
);
110 spin_unlock_irqrestore(shost
->host_lock
, flags
);
115 * scsi_add_timer - Start timeout timer for a single scsi command.
116 * @scmd: scsi command that is about to start running.
117 * @timeout: amount of time to allow this command to run.
118 * @complete: timeout function to call if timer isn't canceled.
121 * This should be turned into an inline function. Each scsi command
122 * has its own timer, and as it is added to the queue, we set up the
123 * timer. When the command completes, we cancel the timer.
125 void scsi_add_timer(struct scsi_cmnd
*scmd
, int timeout
,
126 void (*complete
)(struct scsi_cmnd
*))
130 * If the clock was already running for this command, then
131 * first delete the timer. The timer handling code gets rather
132 * confused if we don't do this.
134 if (scmd
->eh_timeout
.function
)
135 del_timer(&scmd
->eh_timeout
);
137 scmd
->eh_timeout
.data
= (unsigned long)scmd
;
138 scmd
->eh_timeout
.expires
= jiffies
+ timeout
;
139 scmd
->eh_timeout
.function
= (void (*)(unsigned long)) complete
;
141 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p, time:"
142 " %d, (%p)\n", __FUNCTION__
,
143 scmd
, timeout
, complete
));
145 add_timer(&scmd
->eh_timeout
);
149 * scsi_delete_timer - Delete/cancel timer for a given function.
150 * @scmd: Cmd that we are canceling timer for
153 * This should be turned into an inline function.
156 * 1 if we were able to detach the timer. 0 if we blew it, and the
157 * timer function has already started to run.
159 int scsi_delete_timer(struct scsi_cmnd
*scmd
)
163 rtn
= del_timer(&scmd
->eh_timeout
);
165 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p,"
166 " rtn: %d\n", __FUNCTION__
,
169 scmd
->eh_timeout
.data
= (unsigned long)NULL
;
170 scmd
->eh_timeout
.function
= NULL
;
176 * scsi_times_out - Timeout function for normal scsi commands.
177 * @scmd: Cmd that is timing out.
180 * We do not need to lock this. There is the potential for a race
181 * only in that the normal completion handling might run, but if the
182 * normal completion function determines that the timer has already
183 * fired, then it mustn't do anything.
185 void scsi_times_out(struct scsi_cmnd
*scmd
)
187 enum scsi_eh_timer_return (* eh_timed_out
)(struct scsi_cmnd
*);
189 scsi_log_completion(scmd
, TIMEOUT_ERROR
);
191 if (scmd
->device
->host
->transportt
->eh_timed_out
)
192 eh_timed_out
= scmd
->device
->host
->transportt
->eh_timed_out
;
193 else if (scmd
->device
->host
->hostt
->eh_timed_out
)
194 eh_timed_out
= scmd
->device
->host
->hostt
->eh_timed_out
;
199 switch (eh_timed_out(scmd
)) {
204 scsi_add_timer(scmd
, scmd
->timeout_per_command
,
211 if (unlikely(!scsi_eh_scmd_add(scmd
, SCSI_EH_CANCEL_CMD
))) {
212 scmd
->result
|= DID_TIME_OUT
<< 16;
218 * scsi_block_when_processing_errors - Prevent cmds from being queued.
219 * @sdev: Device on which we are performing recovery.
222 * We block until the host is out of error recovery, and then check to
223 * see whether the host or the device is offline.
226 * 0 when dev was taken offline by error recovery. 1 OK to proceed.
228 int scsi_block_when_processing_errors(struct scsi_device
*sdev
)
232 wait_event(sdev
->host
->host_wait
, !scsi_host_in_recovery(sdev
->host
));
234 online
= scsi_device_online(sdev
);
236 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __FUNCTION__
,
241 EXPORT_SYMBOL(scsi_block_when_processing_errors
);
243 #ifdef CONFIG_SCSI_LOGGING
245 * scsi_eh_prt_fail_stats - Log info on failures.
246 * @shost: scsi host being recovered.
247 * @work_q: Queue of scsi cmds to process.
249 static inline void scsi_eh_prt_fail_stats(struct Scsi_Host
*shost
,
250 struct list_head
*work_q
)
252 struct scsi_cmnd
*scmd
;
253 struct scsi_device
*sdev
;
254 int total_failures
= 0;
257 int devices_failed
= 0;
259 shost_for_each_device(sdev
, shost
) {
260 list_for_each_entry(scmd
, work_q
, eh_entry
) {
261 if (scmd
->device
== sdev
) {
263 if (scmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
)
270 if (cmd_cancel
|| cmd_failed
) {
271 SCSI_LOG_ERROR_RECOVERY(3,
272 sdev_printk(KERN_INFO
, sdev
,
273 "%s: cmds failed: %d, cancel: %d\n",
274 __FUNCTION__
, cmd_failed
,
282 SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d"
283 " devices require eh work\n",
284 total_failures
, devices_failed
));
289 * scsi_check_sense - Examine scsi cmd sense
290 * @scmd: Cmd to have sense checked.
293 * SUCCESS or FAILED or NEEDS_RETRY
296 * When a deferred error is detected the current command has
297 * not been executed and needs retrying.
299 static int scsi_check_sense(struct scsi_cmnd
*scmd
)
301 struct scsi_sense_hdr sshdr
;
303 if (! scsi_command_normalize_sense(scmd
, &sshdr
))
304 return FAILED
; /* no valid sense data */
306 if (scsi_sense_is_deferred(&sshdr
))
310 * Previous logic looked for FILEMARK, EOM or ILI which are
311 * mainly associated with tapes and returned SUCCESS.
313 if (sshdr
.response_code
== 0x70) {
315 if (scmd
->sense_buffer
[2] & 0xe0)
319 * descriptor format: look for "stream commands sense data
320 * descriptor" (see SSC-3). Assume single sense data
321 * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG.
323 if ((sshdr
.additional_length
> 3) &&
324 (scmd
->sense_buffer
[8] == 0x4) &&
325 (scmd
->sense_buffer
[11] & 0xe0))
329 switch (sshdr
.sense_key
) {
332 case RECOVERED_ERROR
:
333 return /* soft_error */ SUCCESS
;
335 case ABORTED_COMMAND
:
340 * if we are expecting a cc/ua because of a bus reset that we
341 * performed, treat this just as a retry. otherwise this is
342 * information that we should pass up to the upper-level driver
343 * so that we can deal with it there.
345 if (scmd
->device
->expecting_cc_ua
) {
346 scmd
->device
->expecting_cc_ua
= 0;
350 * if the device is in the process of becoming ready, we
353 if ((sshdr
.asc
== 0x04) && (sshdr
.ascq
== 0x01))
356 * if the device is not started, we need to wake
357 * the error handler to start the motor
359 if (scmd
->device
->allow_restart
&&
360 (sshdr
.asc
== 0x04) && (sshdr
.ascq
== 0x02))
364 /* these three are not supported */
366 case VOLUME_OVERFLOW
:
371 if (sshdr
.asc
== 0x11 || /* UNRECOVERED READ ERR */
372 sshdr
.asc
== 0x13 || /* AMNF DATA FIELD */
373 sshdr
.asc
== 0x14) { /* RECORD NOT FOUND */
379 if (scmd
->device
->retry_hwerror
)
384 case ILLEGAL_REQUEST
:
393 * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD.
394 * @scmd: SCSI cmd to examine.
397 * This is *only* called when we are examining the status of commands
398 * queued during error recovery. the main difference here is that we
399 * don't allow for the possibility of retries here, and we are a lot
400 * more restrictive about what we consider acceptable.
402 static int scsi_eh_completed_normally(struct scsi_cmnd
*scmd
)
405 * first check the host byte, to see if there is anything in there
406 * that would indicate what we need to do.
408 if (host_byte(scmd
->result
) == DID_RESET
) {
410 * rats. we are already in the error handler, so we now
411 * get to try and figure out what to do next. if the sense
412 * is valid, we have a pretty good idea of what to do.
413 * if not, we mark it as FAILED.
415 return scsi_check_sense(scmd
);
417 if (host_byte(scmd
->result
) != DID_OK
)
421 * next, check the message byte.
423 if (msg_byte(scmd
->result
) != COMMAND_COMPLETE
)
427 * now, check the status byte to see if this indicates
430 switch (status_byte(scmd
->result
)) {
432 case COMMAND_TERMINATED
:
434 case CHECK_CONDITION
:
435 return scsi_check_sense(scmd
);
437 case INTERMEDIATE_GOOD
:
438 case INTERMEDIATE_C_GOOD
:
440 * who knows? FIXME(eric)
445 case RESERVATION_CONFLICT
:
453 * scsi_eh_done - Completion function for error handling.
454 * @scmd: Cmd that is done.
456 static void scsi_eh_done(struct scsi_cmnd
*scmd
)
458 struct completion
*eh_action
;
460 SCSI_LOG_ERROR_RECOVERY(3,
461 printk("%s scmd: %p result: %x\n",
462 __FUNCTION__
, scmd
, scmd
->result
));
464 eh_action
= scmd
->device
->host
->eh_action
;
470 * scsi_try_host_reset - ask host adapter to reset itself
471 * @scmd: SCSI cmd to send hsot reset.
473 static int scsi_try_host_reset(struct scsi_cmnd
*scmd
)
478 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
481 if (!scmd
->device
->host
->hostt
->eh_host_reset_handler
)
484 rtn
= scmd
->device
->host
->hostt
->eh_host_reset_handler(scmd
);
486 if (rtn
== SUCCESS
) {
487 if (!scmd
->device
->host
->hostt
->skip_settle_delay
)
488 ssleep(HOST_RESET_SETTLE_TIME
);
489 spin_lock_irqsave(scmd
->device
->host
->host_lock
, flags
);
490 scsi_report_bus_reset(scmd
->device
->host
,
492 spin_unlock_irqrestore(scmd
->device
->host
->host_lock
, flags
);
499 * scsi_try_bus_reset - ask host to perform a bus reset
500 * @scmd: SCSI cmd to send bus reset.
502 static int scsi_try_bus_reset(struct scsi_cmnd
*scmd
)
507 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
510 if (!scmd
->device
->host
->hostt
->eh_bus_reset_handler
)
513 rtn
= scmd
->device
->host
->hostt
->eh_bus_reset_handler(scmd
);
515 if (rtn
== SUCCESS
) {
516 if (!scmd
->device
->host
->hostt
->skip_settle_delay
)
517 ssleep(BUS_RESET_SETTLE_TIME
);
518 spin_lock_irqsave(scmd
->device
->host
->host_lock
, flags
);
519 scsi_report_bus_reset(scmd
->device
->host
,
521 spin_unlock_irqrestore(scmd
->device
->host
->host_lock
, flags
);
528 * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
529 * @scmd: SCSI cmd used to send BDR
532 * There is no timeout for this operation. if this operation is
533 * unreliable for a given host, then the host itself needs to put a
534 * timer on it, and set the host back to a consistent state prior to
537 static int scsi_try_bus_device_reset(struct scsi_cmnd
*scmd
)
541 if (!scmd
->device
->host
->hostt
->eh_device_reset_handler
)
544 rtn
= scmd
->device
->host
->hostt
->eh_device_reset_handler(scmd
);
545 if (rtn
== SUCCESS
) {
546 scmd
->device
->was_reset
= 1;
547 scmd
->device
->expecting_cc_ua
= 1;
553 static int __scsi_try_to_abort_cmd(struct scsi_cmnd
*scmd
)
555 if (!scmd
->device
->host
->hostt
->eh_abort_handler
)
558 return scmd
->device
->host
->hostt
->eh_abort_handler(scmd
);
562 * scsi_try_to_abort_cmd - Ask host to abort a running command.
563 * @scmd: SCSI cmd to abort from Lower Level.
566 * This function will not return until the user's completion function
567 * has been called. there is no timeout on this operation. if the
568 * author of the low-level driver wishes this operation to be timed,
569 * they can provide this facility themselves. helper functions in
570 * scsi_error.c can be supplied to make this easier to do.
572 static int scsi_try_to_abort_cmd(struct scsi_cmnd
*scmd
)
575 * scsi_done was called just after the command timed out and before
576 * we had a chance to process it. (db)
578 if (scmd
->serial_number
== 0)
580 return __scsi_try_to_abort_cmd(scmd
);
583 static void scsi_abort_eh_cmnd(struct scsi_cmnd
*scmd
)
585 if (__scsi_try_to_abort_cmd(scmd
) != SUCCESS
)
586 if (scsi_try_bus_device_reset(scmd
) != SUCCESS
)
587 if (scsi_try_bus_reset(scmd
) != SUCCESS
)
588 scsi_try_host_reset(scmd
);
592 * scsi_send_eh_cmnd - submit a scsi command as part of error recory
593 * @scmd: SCSI command structure to hijack
595 * @cmnd_size: size in bytes of @cmnd
596 * @timeout: timeout for this request
597 * @copy_sense: request sense data if set to 1
599 * This function is used to send a scsi command down to a target device
600 * as part of the error recovery process. If @copy_sense is 0 the command
601 * sent must be one that does not transfer any data. If @copy_sense is 1
602 * the command must be REQUEST_SENSE and this functions copies out the
603 * sense buffer it got into @scmd->sense_buffer.
606 * SUCCESS or FAILED or NEEDS_RETRY
608 static int scsi_send_eh_cmnd(struct scsi_cmnd
*scmd
, unsigned char *cmnd
,
609 int cmnd_size
, int timeout
, int copy_sense
)
611 struct scsi_device
*sdev
= scmd
->device
;
612 struct Scsi_Host
*shost
= sdev
->host
;
613 int old_result
= scmd
->result
;
614 DECLARE_COMPLETION_ONSTACK(done
);
615 unsigned long timeleft
;
617 struct scatterlist sgl
;
618 unsigned char old_cmnd
[MAX_COMMAND_SIZE
];
619 enum dma_data_direction old_data_direction
;
620 unsigned short old_use_sg
;
621 unsigned char old_cmd_len
;
622 unsigned old_bufflen
;
627 * We need saved copies of a number of fields - this is because
628 * error handling may need to overwrite these with different values
629 * to run different commands, and once error handling is complete,
630 * we will need to restore these values prior to running the actual
633 old_buffer
= scmd
->request_buffer
;
634 old_bufflen
= scmd
->request_bufflen
;
635 memcpy(old_cmnd
, scmd
->cmnd
, sizeof(scmd
->cmnd
));
636 old_data_direction
= scmd
->sc_data_direction
;
637 old_cmd_len
= scmd
->cmd_len
;
638 old_use_sg
= scmd
->use_sg
;
640 memset(scmd
->cmnd
, 0, sizeof(scmd
->cmnd
));
641 memcpy(scmd
->cmnd
, cmnd
, cmnd_size
);
644 gfp_t gfp_mask
= GFP_ATOMIC
;
646 if (shost
->hostt
->unchecked_isa_dma
)
647 gfp_mask
|= __GFP_DMA
;
649 sgl
.page
= alloc_page(gfp_mask
);
655 scmd
->sc_data_direction
= DMA_FROM_DEVICE
;
656 scmd
->request_bufflen
= sgl
.length
;
657 scmd
->request_buffer
= &sgl
;
660 scmd
->request_buffer
= NULL
;
661 scmd
->request_bufflen
= 0;
662 scmd
->sc_data_direction
= DMA_NONE
;
667 scmd
->cmd_len
= COMMAND_SIZE(scmd
->cmnd
[0]);
669 if (sdev
->scsi_level
<= SCSI_2
)
670 scmd
->cmnd
[1] = (scmd
->cmnd
[1] & 0x1f) |
671 (sdev
->lun
<< 5 & 0xe0);
674 * Zero the sense buffer. The scsi spec mandates that any
675 * untransferred sense data should be interpreted as being zero.
677 memset(scmd
->sense_buffer
, 0, sizeof(scmd
->sense_buffer
));
679 shost
->eh_action
= &done
;
681 spin_lock_irqsave(shost
->host_lock
, flags
);
683 shost
->hostt
->queuecommand(scmd
, scsi_eh_done
);
684 spin_unlock_irqrestore(shost
->host_lock
, flags
);
686 timeleft
= wait_for_completion_timeout(&done
, timeout
);
688 shost
->eh_action
= NULL
;
690 scsi_log_completion(scmd
, SUCCESS
);
692 SCSI_LOG_ERROR_RECOVERY(3,
693 printk("%s: scmd: %p, timeleft: %ld\n",
694 __FUNCTION__
, scmd
, timeleft
));
697 * If there is time left scsi_eh_done got called, and we will
698 * examine the actual status codes to see whether the command
699 * actually did complete normally, else tell the host to forget
700 * about this command.
703 rtn
= scsi_eh_completed_normally(scmd
);
704 SCSI_LOG_ERROR_RECOVERY(3,
705 printk("%s: scsi_eh_completed_normally %x\n",
718 scsi_abort_eh_cmnd(scmd
);
724 * Last chance to have valid sense data.
727 if (!SCSI_SENSE_VALID(scmd
)) {
728 memcpy(scmd
->sense_buffer
, page_address(sgl
.page
),
729 sizeof(scmd
->sense_buffer
));
731 __free_page(sgl
.page
);
736 * Restore original data
738 scmd
->request_buffer
= old_buffer
;
739 scmd
->request_bufflen
= old_bufflen
;
740 memcpy(scmd
->cmnd
, old_cmnd
, sizeof(scmd
->cmnd
));
741 scmd
->sc_data_direction
= old_data_direction
;
742 scmd
->cmd_len
= old_cmd_len
;
743 scmd
->use_sg
= old_use_sg
;
744 scmd
->result
= old_result
;
749 * scsi_request_sense - Request sense data from a particular target.
750 * @scmd: SCSI cmd for request sense.
753 * Some hosts automatically obtain this information, others require
754 * that we obtain it on our own. This function will *not* return until
755 * the command either times out, or it completes.
757 static int scsi_request_sense(struct scsi_cmnd
*scmd
)
759 static unsigned char generic_sense
[6] =
760 {REQUEST_SENSE
, 0, 0, 0, 252, 0};
762 return scsi_send_eh_cmnd(scmd
, generic_sense
, 6, SENSE_TIMEOUT
, 1);
766 * scsi_eh_finish_cmd - Handle a cmd that eh is finished with.
767 * @scmd: Original SCSI cmd that eh has finished.
768 * @done_q: Queue for processed commands.
771 * We don't want to use the normal command completion while we are are
772 * still handling errors - it may cause other commands to be queued,
773 * and that would disturb what we are doing. thus we really want to
774 * keep a list of pending commands for final completion, and once we
775 * are ready to leave error handling we handle completion for real.
777 void scsi_eh_finish_cmd(struct scsi_cmnd
*scmd
, struct list_head
*done_q
)
779 scmd
->device
->host
->host_failed
--;
781 list_move_tail(&scmd
->eh_entry
, done_q
);
783 EXPORT_SYMBOL(scsi_eh_finish_cmd
);
786 * scsi_eh_get_sense - Get device sense data.
787 * @work_q: Queue of commands to process.
788 * @done_q: Queue of proccessed commands..
791 * See if we need to request sense information. if so, then get it
792 * now, so we have a better idea of what to do.
795 * This has the unfortunate side effect that if a shost adapter does
796 * not automatically request sense information, that we end up shutting
797 * it down before we request it.
799 * All drivers should request sense information internally these days,
800 * so for now all I have to say is tough noogies if you end up in here.
802 * XXX: Long term this code should go away, but that needs an audit of
805 int scsi_eh_get_sense(struct list_head
*work_q
,
806 struct list_head
*done_q
)
808 struct scsi_cmnd
*scmd
, *next
;
811 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
812 if ((scmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
) ||
813 SCSI_SENSE_VALID(scmd
))
816 SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO
, scmd
,
817 "%s: requesting sense\n",
819 rtn
= scsi_request_sense(scmd
);
823 SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p"
824 " result %x\n", scmd
,
826 SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd
));
828 rtn
= scsi_decide_disposition(scmd
);
831 * if the result was normal, then just pass it along to the
835 /* we don't want this command reissued, just
836 * finished with the sense data, so set
837 * retries to the max allowed to ensure it
838 * won't get reissued */
839 scmd
->retries
= scmd
->allowed
;
840 else if (rtn
!= NEEDS_RETRY
)
843 scsi_eh_finish_cmd(scmd
, done_q
);
846 return list_empty(work_q
);
848 EXPORT_SYMBOL_GPL(scsi_eh_get_sense
);
851 * scsi_eh_tur - Send TUR to device.
852 * @scmd: Scsi cmd to send TUR
855 * 0 - Device is ready. 1 - Device NOT ready.
857 static int scsi_eh_tur(struct scsi_cmnd
*scmd
)
859 static unsigned char tur_command
[6] = {TEST_UNIT_READY
, 0, 0, 0, 0, 0};
860 int retry_cnt
= 1, rtn
;
863 rtn
= scsi_send_eh_cmnd(scmd
, tur_command
, 6, SENSE_TIMEOUT
, 0);
865 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
866 __FUNCTION__
, scmd
, rtn
));
881 * scsi_eh_abort_cmds - abort canceled commands.
882 * @shost: scsi host being recovered.
883 * @eh_done_q: list_head for processed commands.
886 * Try and see whether or not it makes sense to try and abort the
887 * running command. this only works out to be the case if we have one
888 * command that has timed out. if the command simply failed, it makes
889 * no sense to try and abort the command, since as far as the shost
890 * adapter is concerned, it isn't running.
892 static int scsi_eh_abort_cmds(struct list_head
*work_q
,
893 struct list_head
*done_q
)
895 struct scsi_cmnd
*scmd
, *next
;
898 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
899 if (!(scmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
))
901 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:"
902 "0x%p\n", current
->comm
,
904 rtn
= scsi_try_to_abort_cmd(scmd
);
905 if (rtn
== SUCCESS
) {
906 scmd
->eh_eflags
&= ~SCSI_EH_CANCEL_CMD
;
907 if (!scsi_device_online(scmd
->device
) ||
908 !scsi_eh_tur(scmd
)) {
909 scsi_eh_finish_cmd(scmd
, done_q
);
913 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting"
920 return list_empty(work_q
);
924 * scsi_eh_try_stu - Send START_UNIT to device.
925 * @scmd: Scsi cmd to send START_UNIT
928 * 0 - Device is ready. 1 - Device NOT ready.
930 static int scsi_eh_try_stu(struct scsi_cmnd
*scmd
)
932 static unsigned char stu_command
[6] = {START_STOP
, 0, 0, 0, 1, 0};
934 if (scmd
->device
->allow_restart
) {
935 int i
, rtn
= NEEDS_RETRY
;
937 for (i
= 0; rtn
== NEEDS_RETRY
&& i
< 2; i
++)
938 rtn
= scsi_send_eh_cmnd(scmd
, stu_command
, 6,
939 START_UNIT_TIMEOUT
, 0);
949 * scsi_eh_stu - send START_UNIT if needed
950 * @shost: scsi host being recovered.
951 * @eh_done_q: list_head for processed commands.
954 * If commands are failing due to not ready, initializing command required,
955 * try revalidating the device, which will end up sending a start unit.
957 static int scsi_eh_stu(struct Scsi_Host
*shost
,
958 struct list_head
*work_q
,
959 struct list_head
*done_q
)
961 struct scsi_cmnd
*scmd
, *stu_scmd
, *next
;
962 struct scsi_device
*sdev
;
964 shost_for_each_device(sdev
, shost
) {
966 list_for_each_entry(scmd
, work_q
, eh_entry
)
967 if (scmd
->device
== sdev
&& SCSI_SENSE_VALID(scmd
) &&
968 scsi_check_sense(scmd
) == FAILED
) {
976 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:"
977 " 0x%p\n", current
->comm
, sdev
));
979 if (!scsi_eh_try_stu(stu_scmd
)) {
980 if (!scsi_device_online(sdev
) ||
981 !scsi_eh_tur(stu_scmd
)) {
982 list_for_each_entry_safe(scmd
, next
,
984 if (scmd
->device
== sdev
)
985 scsi_eh_finish_cmd(scmd
, done_q
);
989 SCSI_LOG_ERROR_RECOVERY(3,
990 printk("%s: START_UNIT failed to sdev:"
991 " 0x%p\n", current
->comm
, sdev
));
995 return list_empty(work_q
);
1000 * scsi_eh_bus_device_reset - send bdr if needed
1001 * @shost: scsi host being recovered.
1002 * @eh_done_q: list_head for processed commands.
1005 * Try a bus device reset. still, look to see whether we have multiple
1006 * devices that are jammed or not - if we have multiple devices, it
1007 * makes no sense to try bus_device_reset - we really would need to try
1008 * a bus_reset instead.
1010 static int scsi_eh_bus_device_reset(struct Scsi_Host
*shost
,
1011 struct list_head
*work_q
,
1012 struct list_head
*done_q
)
1014 struct scsi_cmnd
*scmd
, *bdr_scmd
, *next
;
1015 struct scsi_device
*sdev
;
1018 shost_for_each_device(sdev
, shost
) {
1020 list_for_each_entry(scmd
, work_q
, eh_entry
)
1021 if (scmd
->device
== sdev
) {
1029 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:"
1030 " 0x%p\n", current
->comm
,
1032 rtn
= scsi_try_bus_device_reset(bdr_scmd
);
1033 if (rtn
== SUCCESS
) {
1034 if (!scsi_device_online(sdev
) ||
1035 !scsi_eh_tur(bdr_scmd
)) {
1036 list_for_each_entry_safe(scmd
, next
,
1038 if (scmd
->device
== sdev
)
1039 scsi_eh_finish_cmd(scmd
,
1044 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR"
1052 return list_empty(work_q
);
1056 * scsi_eh_bus_reset - send a bus reset
1057 * @shost: scsi host being recovered.
1058 * @eh_done_q: list_head for processed commands.
1060 static int scsi_eh_bus_reset(struct Scsi_Host
*shost
,
1061 struct list_head
*work_q
,
1062 struct list_head
*done_q
)
1064 struct scsi_cmnd
*scmd
, *chan_scmd
, *next
;
1065 unsigned int channel
;
1069 * we really want to loop over the various channels, and do this on
1070 * a channel by channel basis. we should also check to see if any
1071 * of the failed commands are on soft_reset devices, and if so, skip
1075 for (channel
= 0; channel
<= shost
->max_channel
; channel
++) {
1077 list_for_each_entry(scmd
, work_q
, eh_entry
) {
1078 if (channel
== scmd_channel(scmd
)) {
1082 * FIXME add back in some support for
1083 * soft_reset devices.
1090 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:"
1091 " %d\n", current
->comm
,
1093 rtn
= scsi_try_bus_reset(chan_scmd
);
1094 if (rtn
== SUCCESS
) {
1095 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1096 if (channel
== scmd_channel(scmd
))
1097 if (!scsi_device_online(scmd
->device
) ||
1099 scsi_eh_finish_cmd(scmd
,
1103 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST"
1104 " failed chan: %d\n",
1109 return list_empty(work_q
);
1113 * scsi_eh_host_reset - send a host reset
1114 * @work_q: list_head for processed commands.
1115 * @done_q: list_head for processed commands.
1117 static int scsi_eh_host_reset(struct list_head
*work_q
,
1118 struct list_head
*done_q
)
1120 struct scsi_cmnd
*scmd
, *next
;
1123 if (!list_empty(work_q
)) {
1124 scmd
= list_entry(work_q
->next
,
1125 struct scsi_cmnd
, eh_entry
);
1127 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n"
1130 rtn
= scsi_try_host_reset(scmd
);
1131 if (rtn
== SUCCESS
) {
1132 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1133 if (!scsi_device_online(scmd
->device
) ||
1134 (!scsi_eh_try_stu(scmd
) && !scsi_eh_tur(scmd
)) ||
1136 scsi_eh_finish_cmd(scmd
, done_q
);
1139 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST"
1144 return list_empty(work_q
);
1148 * scsi_eh_offline_sdevs - offline scsi devices that fail to recover
1149 * @work_q: list_head for processed commands.
1150 * @done_q: list_head for processed commands.
1153 static void scsi_eh_offline_sdevs(struct list_head
*work_q
,
1154 struct list_head
*done_q
)
1156 struct scsi_cmnd
*scmd
, *next
;
1158 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1159 sdev_printk(KERN_INFO
, scmd
->device
,
1160 "scsi: Device offlined - not"
1161 " ready after error recovery\n");
1162 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1163 if (scmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
) {
1165 * FIXME: Handle lost cmds.
1168 scsi_eh_finish_cmd(scmd
, done_q
);
1174 * scsi_decide_disposition - Disposition a cmd on return from LLD.
1175 * @scmd: SCSI cmd to examine.
1178 * This is *only* called when we are examining the status after sending
1179 * out the actual data command. any commands that are queued for error
1180 * recovery (e.g. test_unit_ready) do *not* come through here.
1182 * When this routine returns failed, it means the error handler thread
1183 * is woken. In cases where the error code indicates an error that
1184 * doesn't require the error handler read (i.e. we don't need to
1185 * abort/reset), this function should return SUCCESS.
1187 int scsi_decide_disposition(struct scsi_cmnd
*scmd
)
1192 * if the device is offline, then we clearly just pass the result back
1193 * up to the top level.
1195 if (!scsi_device_online(scmd
->device
)) {
1196 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report"
1203 * first check the host byte, to see if there is anything in there
1204 * that would indicate what we need to do.
1206 switch (host_byte(scmd
->result
)) {
1207 case DID_PASSTHROUGH
:
1209 * no matter what, pass this through to the upper layer.
1210 * nuke this special code so that it looks like we are saying
1213 scmd
->result
&= 0xff00ffff;
1217 * looks good. drop through, and check the next byte.
1220 case DID_NO_CONNECT
:
1221 case DID_BAD_TARGET
:
1224 * note - this means that we just report the status back
1225 * to the top level driver, not that we actually think
1226 * that it indicates SUCCESS.
1230 * when the low level driver returns did_soft_error,
1231 * it is responsible for keeping an internal retry counter
1232 * in order to avoid endless loops (db)
1234 * actually this is a bug in this function here. we should
1235 * be mindful of the maximum number of retries specified
1236 * and not get stuck in a loop.
1238 case DID_SOFT_ERROR
:
1244 return ADD_TO_MLQUEUE
;
1247 if (msg_byte(scmd
->result
) == COMMAND_COMPLETE
&&
1248 status_byte(scmd
->result
) == RESERVATION_CONFLICT
)
1250 * execute reservation conflict processing code
1261 * when we scan the bus, we get timeout messages for
1262 * these commands if there is no device available.
1263 * other hosts report did_no_connect for the same thing.
1265 if ((scmd
->cmnd
[0] == TEST_UNIT_READY
||
1266 scmd
->cmnd
[0] == INQUIRY
)) {
1278 * next, check the message byte.
1280 if (msg_byte(scmd
->result
) != COMMAND_COMPLETE
)
1284 * check the status byte to see if this indicates anything special.
1286 switch (status_byte(scmd
->result
)) {
1289 * the case of trying to send too many commands to a
1290 * tagged queueing device.
1294 * device can't talk to us at the moment. Should only
1295 * occur (SAM-3) when the task queue is empty, so will cause
1296 * the empty queue handling to trigger a stall in the
1299 return ADD_TO_MLQUEUE
;
1301 case COMMAND_TERMINATED
:
1304 case CHECK_CONDITION
:
1305 rtn
= scsi_check_sense(scmd
);
1306 if (rtn
== NEEDS_RETRY
)
1308 /* if rtn == FAILED, we have no sense information;
1309 * returning FAILED will wake the error handler thread
1310 * to collect the sense and redo the decide
1313 case CONDITION_GOOD
:
1314 case INTERMEDIATE_GOOD
:
1315 case INTERMEDIATE_C_GOOD
:
1318 * who knows? FIXME(eric)
1322 case RESERVATION_CONFLICT
:
1323 sdev_printk(KERN_INFO
, scmd
->device
,
1324 "reservation conflict\n");
1325 return SUCCESS
; /* causes immediate i/o error */
1333 /* we requeue for retry because the error was retryable, and
1334 * the request was not marked fast fail. Note that above,
1335 * even if the request is marked fast fail, we still requeue
1336 * for queue congestion conditions (QUEUE_FULL or BUSY) */
1337 if ((++scmd
->retries
) <= scmd
->allowed
1338 && !blk_noretry_request(scmd
->request
)) {
1342 * no more retries - report this one back to upper level.
1349 * scsi_eh_lock_door - Prevent medium removal for the specified device
1350 * @sdev: SCSI device to prevent medium removal
1353 * We must be called from process context; scsi_allocate_request()
1357 * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the
1358 * head of the devices request queue, and continue.
1361 * scsi_allocate_request() may sleep waiting for existing requests to
1362 * be processed. However, since we haven't kicked off any request
1363 * processing for this host, this may deadlock.
1365 * If scsi_allocate_request() fails for what ever reason, we
1366 * completely forget to lock the door.
1368 static void scsi_eh_lock_door(struct scsi_device
*sdev
)
1370 unsigned char cmnd
[MAX_COMMAND_SIZE
];
1372 cmnd
[0] = ALLOW_MEDIUM_REMOVAL
;
1376 cmnd
[4] = SCSI_REMOVAL_PREVENT
;
1379 scsi_execute_async(sdev
, cmnd
, 6, DMA_NONE
, NULL
, 0, 0, 10 * HZ
,
1380 5, NULL
, NULL
, GFP_KERNEL
);
1385 * scsi_restart_operations - restart io operations to the specified host.
1386 * @shost: Host we are restarting.
1389 * When we entered the error handler, we blocked all further i/o to
1390 * this device. we need to 'reverse' this process.
1392 static void scsi_restart_operations(struct Scsi_Host
*shost
)
1394 struct scsi_device
*sdev
;
1395 unsigned long flags
;
1398 * If the door was locked, we need to insert a door lock request
1399 * onto the head of the SCSI request queue for the device. There
1400 * is no point trying to lock the door of an off-line device.
1402 shost_for_each_device(sdev
, shost
) {
1403 if (scsi_device_online(sdev
) && sdev
->locked
)
1404 scsi_eh_lock_door(sdev
);
1408 * next free up anything directly waiting upon the host. this
1409 * will be requests for character device operations, and also for
1410 * ioctls to queued block devices.
1412 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n",
1415 spin_lock_irqsave(shost
->host_lock
, flags
);
1416 if (scsi_host_set_state(shost
, SHOST_RUNNING
))
1417 if (scsi_host_set_state(shost
, SHOST_CANCEL
))
1418 BUG_ON(scsi_host_set_state(shost
, SHOST_DEL
));
1419 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1421 wake_up(&shost
->host_wait
);
1424 * finally we need to re-initiate requests that may be pending. we will
1425 * have had everything blocked while error handling is taking place, and
1426 * now that error recovery is done, we will need to ensure that these
1427 * requests are started.
1429 scsi_run_host_queues(shost
);
1433 * scsi_eh_ready_devs - check device ready state and recover if not.
1434 * @shost: host to be recovered.
1435 * @eh_done_q: list_head for processed commands.
1438 void scsi_eh_ready_devs(struct Scsi_Host
*shost
,
1439 struct list_head
*work_q
,
1440 struct list_head
*done_q
)
1442 if (!scsi_eh_stu(shost
, work_q
, done_q
))
1443 if (!scsi_eh_bus_device_reset(shost
, work_q
, done_q
))
1444 if (!scsi_eh_bus_reset(shost
, work_q
, done_q
))
1445 if (!scsi_eh_host_reset(work_q
, done_q
))
1446 scsi_eh_offline_sdevs(work_q
, done_q
);
1448 EXPORT_SYMBOL_GPL(scsi_eh_ready_devs
);
1451 * scsi_eh_flush_done_q - finish processed commands or retry them.
1452 * @done_q: list_head of processed commands.
1455 void scsi_eh_flush_done_q(struct list_head
*done_q
)
1457 struct scsi_cmnd
*scmd
, *next
;
1459 list_for_each_entry_safe(scmd
, next
, done_q
, eh_entry
) {
1460 list_del_init(&scmd
->eh_entry
);
1461 if (scsi_device_online(scmd
->device
) &&
1462 !blk_noretry_request(scmd
->request
) &&
1463 (++scmd
->retries
<= scmd
->allowed
)) {
1464 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush"
1468 scsi_queue_insert(scmd
, SCSI_MLQUEUE_EH_RETRY
);
1471 * If just we got sense for the device (called
1472 * scsi_eh_get_sense), scmd->result is already
1473 * set, do not set DRIVER_TIMEOUT.
1476 scmd
->result
|= (DRIVER_TIMEOUT
<< 24);
1477 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish"
1479 current
->comm
, scmd
));
1480 scsi_finish_command(scmd
);
1484 EXPORT_SYMBOL(scsi_eh_flush_done_q
);
1487 * scsi_unjam_host - Attempt to fix a host which has a cmd that failed.
1488 * @shost: Host to unjam.
1491 * When we come in here, we *know* that all commands on the bus have
1492 * either completed, failed or timed out. we also know that no further
1493 * commands are being sent to the host, so things are relatively quiet
1494 * and we have freedom to fiddle with things as we wish.
1496 * This is only the *default* implementation. it is possible for
1497 * individual drivers to supply their own version of this function, and
1498 * if the maintainer wishes to do this, it is strongly suggested that
1499 * this function be taken as a template and modified. this function
1500 * was designed to correctly handle problems for about 95% of the
1501 * different cases out there, and it should always provide at least a
1502 * reasonable amount of error recovery.
1504 * Any command marked 'failed' or 'timeout' must eventually have
1505 * scsi_finish_cmd() called for it. we do all of the retry stuff
1506 * here, so when we restart the host after we return it should have an
1509 static void scsi_unjam_host(struct Scsi_Host
*shost
)
1511 unsigned long flags
;
1512 LIST_HEAD(eh_work_q
);
1513 LIST_HEAD(eh_done_q
);
1515 spin_lock_irqsave(shost
->host_lock
, flags
);
1516 list_splice_init(&shost
->eh_cmd_q
, &eh_work_q
);
1517 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1519 SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost
, &eh_work_q
));
1521 if (!scsi_eh_get_sense(&eh_work_q
, &eh_done_q
))
1522 if (!scsi_eh_abort_cmds(&eh_work_q
, &eh_done_q
))
1523 scsi_eh_ready_devs(shost
, &eh_work_q
, &eh_done_q
);
1525 scsi_eh_flush_done_q(&eh_done_q
);
1529 * scsi_error_handler - SCSI error handler thread
1530 * @data: Host for which we are running.
1533 * This is the main error handling loop. This is run as a kernel thread
1534 * for every SCSI host and handles all error handling activity.
1536 int scsi_error_handler(void *data
)
1538 struct Scsi_Host
*shost
= data
;
1540 current
->flags
|= PF_NOFREEZE
;
1543 * We use TASK_INTERRUPTIBLE so that the thread is not
1544 * counted against the load average as a running process.
1545 * We never actually get interrupted because kthread_run
1546 * disables singal delivery for the created thread.
1548 set_current_state(TASK_INTERRUPTIBLE
);
1549 while (!kthread_should_stop()) {
1550 if ((shost
->host_failed
== 0 && shost
->host_eh_scheduled
== 0) ||
1551 shost
->host_failed
!= shost
->host_busy
) {
1552 SCSI_LOG_ERROR_RECOVERY(1,
1553 printk("Error handler scsi_eh_%d sleeping\n",
1556 set_current_state(TASK_INTERRUPTIBLE
);
1560 __set_current_state(TASK_RUNNING
);
1561 SCSI_LOG_ERROR_RECOVERY(1,
1562 printk("Error handler scsi_eh_%d waking up\n",
1566 * We have a host that is failing for some reason. Figure out
1567 * what we need to do to get it up and online again (if we can).
1568 * If we fail, we end up taking the thing offline.
1570 if (shost
->transportt
->eh_strategy_handler
)
1571 shost
->transportt
->eh_strategy_handler(shost
);
1573 scsi_unjam_host(shost
);
1576 * Note - if the above fails completely, the action is to take
1577 * individual devices offline and flush the queue of any
1578 * outstanding requests that may have been pending. When we
1579 * restart, we restart any I/O to any other devices on the bus
1580 * which are still online.
1582 scsi_restart_operations(shost
);
1583 set_current_state(TASK_INTERRUPTIBLE
);
1585 __set_current_state(TASK_RUNNING
);
1587 SCSI_LOG_ERROR_RECOVERY(1,
1588 printk("Error handler scsi_eh_%d exiting\n", shost
->host_no
));
1589 shost
->ehandler
= NULL
;
1594 * Function: scsi_report_bus_reset()
1596 * Purpose: Utility function used by low-level drivers to report that
1597 * they have observed a bus reset on the bus being handled.
1599 * Arguments: shost - Host in question
1600 * channel - channel on which reset was observed.
1604 * Lock status: Host lock must be held.
1606 * Notes: This only needs to be called if the reset is one which
1607 * originates from an unknown location. Resets originated
1608 * by the mid-level itself don't need to call this, but there
1609 * should be no harm.
1611 * The main purpose of this is to make sure that a CHECK_CONDITION
1612 * is properly treated.
1614 void scsi_report_bus_reset(struct Scsi_Host
*shost
, int channel
)
1616 struct scsi_device
*sdev
;
1618 __shost_for_each_device(sdev
, shost
) {
1619 if (channel
== sdev_channel(sdev
)) {
1620 sdev
->was_reset
= 1;
1621 sdev
->expecting_cc_ua
= 1;
1625 EXPORT_SYMBOL(scsi_report_bus_reset
);
1628 * Function: scsi_report_device_reset()
1630 * Purpose: Utility function used by low-level drivers to report that
1631 * they have observed a device reset on the device being handled.
1633 * Arguments: shost - Host in question
1634 * channel - channel on which reset was observed
1635 * target - target on which reset was observed
1639 * Lock status: Host lock must be held
1641 * Notes: This only needs to be called if the reset is one which
1642 * originates from an unknown location. Resets originated
1643 * by the mid-level itself don't need to call this, but there
1644 * should be no harm.
1646 * The main purpose of this is to make sure that a CHECK_CONDITION
1647 * is properly treated.
1649 void scsi_report_device_reset(struct Scsi_Host
*shost
, int channel
, int target
)
1651 struct scsi_device
*sdev
;
1653 __shost_for_each_device(sdev
, shost
) {
1654 if (channel
== sdev_channel(sdev
) &&
1655 target
== sdev_id(sdev
)) {
1656 sdev
->was_reset
= 1;
1657 sdev
->expecting_cc_ua
= 1;
1661 EXPORT_SYMBOL(scsi_report_device_reset
);
1664 scsi_reset_provider_done_command(struct scsi_cmnd
*scmd
)
1669 * Function: scsi_reset_provider
1671 * Purpose: Send requested reset to a bus or device at any phase.
1673 * Arguments: device - device to send reset to
1674 * flag - reset type (see scsi.h)
1676 * Returns: SUCCESS/FAILURE.
1678 * Notes: This is used by the SCSI Generic driver to provide
1679 * Bus/Device reset capability.
1682 scsi_reset_provider(struct scsi_device
*dev
, int flag
)
1684 struct scsi_cmnd
*scmd
= scsi_get_command(dev
, GFP_KERNEL
);
1685 struct Scsi_Host
*shost
= dev
->host
;
1687 unsigned long flags
;
1690 scmd
->request
= &req
;
1691 memset(&scmd
->eh_timeout
, 0, sizeof(scmd
->eh_timeout
));
1693 memset(&scmd
->cmnd
, '\0', sizeof(scmd
->cmnd
));
1695 scmd
->scsi_done
= scsi_reset_provider_done_command
;
1697 scmd
->request_buffer
= NULL
;
1698 scmd
->request_bufflen
= 0;
1702 scmd
->sc_data_direction
= DMA_BIDIRECTIONAL
;
1704 init_timer(&scmd
->eh_timeout
);
1707 * Sometimes the command can get back into the timer chain,
1708 * so use the pid as an identifier.
1712 spin_lock_irqsave(shost
->host_lock
, flags
);
1713 shost
->tmf_in_progress
= 1;
1714 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1717 case SCSI_TRY_RESET_DEVICE
:
1718 rtn
= scsi_try_bus_device_reset(scmd
);
1722 case SCSI_TRY_RESET_BUS
:
1723 rtn
= scsi_try_bus_reset(scmd
);
1727 case SCSI_TRY_RESET_HOST
:
1728 rtn
= scsi_try_host_reset(scmd
);
1734 spin_lock_irqsave(shost
->host_lock
, flags
);
1735 shost
->tmf_in_progress
= 0;
1736 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1739 * be sure to wake up anyone who was sleeping or had their queue
1740 * suspended while we performed the TMF.
1742 SCSI_LOG_ERROR_RECOVERY(3,
1743 printk("%s: waking up host to restart after TMF\n",
1746 wake_up(&shost
->host_wait
);
1748 scsi_run_host_queues(shost
);
1750 scsi_next_command(scmd
);
1753 EXPORT_SYMBOL(scsi_reset_provider
);
1756 * scsi_normalize_sense - normalize main elements from either fixed or
1757 * descriptor sense data format into a common format.
1759 * @sense_buffer: byte array containing sense data returned by device
1760 * @sb_len: number of valid bytes in sense_buffer
1761 * @sshdr: pointer to instance of structure that common
1762 * elements are written to.
1765 * The "main elements" from sense data are: response_code, sense_key,
1766 * asc, ascq and additional_length (only for descriptor format).
1768 * Typically this function can be called after a device has
1769 * responded to a SCSI command with the CHECK_CONDITION status.
1772 * 1 if valid sense data information found, else 0;
1774 int scsi_normalize_sense(const u8
*sense_buffer
, int sb_len
,
1775 struct scsi_sense_hdr
*sshdr
)
1777 if (!sense_buffer
|| !sb_len
)
1780 memset(sshdr
, 0, sizeof(struct scsi_sense_hdr
));
1782 sshdr
->response_code
= (sense_buffer
[0] & 0x7f);
1784 if (!scsi_sense_valid(sshdr
))
1787 if (sshdr
->response_code
>= 0x72) {
1792 sshdr
->sense_key
= (sense_buffer
[1] & 0xf);
1794 sshdr
->asc
= sense_buffer
[2];
1796 sshdr
->ascq
= sense_buffer
[3];
1798 sshdr
->additional_length
= sense_buffer
[7];
1804 sshdr
->sense_key
= (sense_buffer
[2] & 0xf);
1806 sb_len
= (sb_len
< (sense_buffer
[7] + 8)) ?
1807 sb_len
: (sense_buffer
[7] + 8);
1809 sshdr
->asc
= sense_buffer
[12];
1811 sshdr
->ascq
= sense_buffer
[13];
1817 EXPORT_SYMBOL(scsi_normalize_sense
);
1819 int scsi_command_normalize_sense(struct scsi_cmnd
*cmd
,
1820 struct scsi_sense_hdr
*sshdr
)
1822 return scsi_normalize_sense(cmd
->sense_buffer
,
1823 sizeof(cmd
->sense_buffer
), sshdr
);
1825 EXPORT_SYMBOL(scsi_command_normalize_sense
);
1828 * scsi_sense_desc_find - search for a given descriptor type in
1829 * descriptor sense data format.
1831 * @sense_buffer: byte array of descriptor format sense data
1832 * @sb_len: number of valid bytes in sense_buffer
1833 * @desc_type: value of descriptor type to find
1834 * (e.g. 0 -> information)
1837 * only valid when sense data is in descriptor format
1840 * pointer to start of (first) descriptor if found else NULL
1842 const u8
* scsi_sense_desc_find(const u8
* sense_buffer
, int sb_len
,
1845 int add_sen_len
, add_len
, desc_len
, k
;
1848 if ((sb_len
< 8) || (0 == (add_sen_len
= sense_buffer
[7])))
1850 if ((sense_buffer
[0] < 0x72) || (sense_buffer
[0] > 0x73))
1852 add_sen_len
= (add_sen_len
< (sb_len
- 8)) ?
1853 add_sen_len
: (sb_len
- 8);
1854 descp
= &sense_buffer
[8];
1855 for (desc_len
= 0, k
= 0; k
< add_sen_len
; k
+= desc_len
) {
1857 add_len
= (k
< (add_sen_len
- 1)) ? descp
[1]: -1;
1858 desc_len
= add_len
+ 2;
1859 if (descp
[0] == desc_type
)
1861 if (add_len
< 0) // short descriptor ??
1866 EXPORT_SYMBOL(scsi_sense_desc_find
);
1869 * scsi_get_sense_info_fld - attempts to get information field from
1870 * sense data (either fixed or descriptor format)
1872 * @sense_buffer: byte array of sense data
1873 * @sb_len: number of valid bytes in sense_buffer
1874 * @info_out: pointer to 64 integer where 8 or 4 byte information
1875 * field will be placed if found.
1878 * 1 if information field found, 0 if not found.
1880 int scsi_get_sense_info_fld(const u8
* sense_buffer
, int sb_len
,
1889 switch (sense_buffer
[0] & 0x7f) {
1892 if (sense_buffer
[0] & 0x80) {
1893 *info_out
= (sense_buffer
[3] << 24) +
1894 (sense_buffer
[4] << 16) +
1895 (sense_buffer
[5] << 8) + sense_buffer
[6];
1901 ucp
= scsi_sense_desc_find(sense_buffer
, sb_len
,
1903 if (ucp
&& (0xa == ucp
[1])) {
1905 for (j
= 0; j
< 8; ++j
) {
1918 EXPORT_SYMBOL(scsi_get_sense_info_fld
);