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/kernel.h>
22 #include <linux/kthread.h>
23 #include <linux/interrupt.h>
24 #include <linux/blkdev.h>
25 #include <linux/delay.h>
26 #include <linux/scatterlist.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)
43 * These should *probably* be handled by the host itself.
44 * Since it is allowed to sleep, it probably should.
46 #define BUS_RESET_SETTLE_TIME (10)
47 #define HOST_RESET_SETTLE_TIME (10)
49 /* called with shost->host_lock held */
50 void scsi_eh_wakeup(struct Scsi_Host
*shost
)
52 if (shost
->host_busy
== shost
->host_failed
) {
53 wake_up_process(shost
->ehandler
);
54 SCSI_LOG_ERROR_RECOVERY(5,
55 printk("Waking error handler thread\n"));
60 * scsi_schedule_eh - schedule EH for SCSI host
61 * @shost: SCSI host to invoke error handling on.
63 * Schedule SCSI EH without scmd.
65 void scsi_schedule_eh(struct Scsi_Host
*shost
)
69 spin_lock_irqsave(shost
->host_lock
, flags
);
71 if (scsi_host_set_state(shost
, SHOST_RECOVERY
) == 0 ||
72 scsi_host_set_state(shost
, SHOST_CANCEL_RECOVERY
) == 0) {
73 shost
->host_eh_scheduled
++;
74 scsi_eh_wakeup(shost
);
77 spin_unlock_irqrestore(shost
->host_lock
, flags
);
79 EXPORT_SYMBOL_GPL(scsi_schedule_eh
);
82 * scsi_eh_scmd_add - add scsi cmd to error handling.
83 * @scmd: scmd to run eh on.
84 * @eh_flag: optional SCSI_EH flag.
89 int scsi_eh_scmd_add(struct scsi_cmnd
*scmd
, int eh_flag
)
91 struct Scsi_Host
*shost
= scmd
->device
->host
;
98 spin_lock_irqsave(shost
->host_lock
, flags
);
99 if (scsi_host_set_state(shost
, SHOST_RECOVERY
))
100 if (scsi_host_set_state(shost
, SHOST_CANCEL_RECOVERY
))
104 scmd
->eh_eflags
|= eh_flag
;
105 list_add_tail(&scmd
->eh_entry
, &shost
->eh_cmd_q
);
106 shost
->host_failed
++;
107 scsi_eh_wakeup(shost
);
109 spin_unlock_irqrestore(shost
->host_lock
, flags
);
114 * scsi_add_timer - Start timeout timer for a single scsi command.
115 * @scmd: scsi command that is about to start running.
116 * @timeout: amount of time to allow this command to run.
117 * @complete: timeout function to call if timer isn't canceled.
120 * This should be turned into an inline function. Each scsi command
121 * has its own timer, and as it is added to the queue, we set up the
122 * timer. When the command completes, we cancel the timer.
124 void scsi_add_timer(struct scsi_cmnd
*scmd
, int timeout
,
125 void (*complete
)(struct scsi_cmnd
*))
129 * If the clock was already running for this command, then
130 * first delete the timer. The timer handling code gets rather
131 * confused if we don't do this.
133 if (scmd
->eh_timeout
.function
)
134 del_timer(&scmd
->eh_timeout
);
136 scmd
->eh_timeout
.data
= (unsigned long)scmd
;
137 scmd
->eh_timeout
.expires
= jiffies
+ timeout
;
138 scmd
->eh_timeout
.function
= (void (*)(unsigned long)) complete
;
140 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p, time:"
141 " %d, (%p)\n", __FUNCTION__
,
142 scmd
, timeout
, complete
));
144 add_timer(&scmd
->eh_timeout
);
148 * scsi_delete_timer - Delete/cancel timer for a given function.
149 * @scmd: Cmd that we are canceling timer for
152 * This should be turned into an inline function.
155 * 1 if we were able to detach the timer. 0 if we blew it, and the
156 * timer function has already started to run.
158 int scsi_delete_timer(struct scsi_cmnd
*scmd
)
162 rtn
= del_timer(&scmd
->eh_timeout
);
164 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p,"
165 " rtn: %d\n", __FUNCTION__
,
168 scmd
->eh_timeout
.data
= (unsigned long)NULL
;
169 scmd
->eh_timeout
.function
= NULL
;
175 * scsi_times_out - Timeout function for normal scsi commands.
176 * @scmd: Cmd that is timing out.
179 * We do not need to lock this. There is the potential for a race
180 * only in that the normal completion handling might run, but if the
181 * normal completion function determines that the timer has already
182 * fired, then it mustn't do anything.
184 void scsi_times_out(struct scsi_cmnd
*scmd
)
186 enum scsi_eh_timer_return (* eh_timed_out
)(struct scsi_cmnd
*);
188 scsi_log_completion(scmd
, TIMEOUT_ERROR
);
190 if (scmd
->device
->host
->transportt
->eh_timed_out
)
191 eh_timed_out
= scmd
->device
->host
->transportt
->eh_timed_out
;
192 else if (scmd
->device
->host
->hostt
->eh_timed_out
)
193 eh_timed_out
= scmd
->device
->host
->hostt
->eh_timed_out
;
198 switch (eh_timed_out(scmd
)) {
203 scsi_add_timer(scmd
, scmd
->timeout_per_command
,
210 if (unlikely(!scsi_eh_scmd_add(scmd
, SCSI_EH_CANCEL_CMD
))) {
211 scmd
->result
|= DID_TIME_OUT
<< 16;
217 * scsi_block_when_processing_errors - Prevent cmds from being queued.
218 * @sdev: Device on which we are performing recovery.
221 * We block until the host is out of error recovery, and then check to
222 * see whether the host or the device is offline.
225 * 0 when dev was taken offline by error recovery. 1 OK to proceed.
227 int scsi_block_when_processing_errors(struct scsi_device
*sdev
)
231 wait_event(sdev
->host
->host_wait
, !scsi_host_in_recovery(sdev
->host
));
233 online
= scsi_device_online(sdev
);
235 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __FUNCTION__
,
240 EXPORT_SYMBOL(scsi_block_when_processing_errors
);
242 #ifdef CONFIG_SCSI_LOGGING
244 * scsi_eh_prt_fail_stats - Log info on failures.
245 * @shost: scsi host being recovered.
246 * @work_q: Queue of scsi cmds to process.
248 static inline void scsi_eh_prt_fail_stats(struct Scsi_Host
*shost
,
249 struct list_head
*work_q
)
251 struct scsi_cmnd
*scmd
;
252 struct scsi_device
*sdev
;
253 int total_failures
= 0;
256 int devices_failed
= 0;
258 shost_for_each_device(sdev
, shost
) {
259 list_for_each_entry(scmd
, work_q
, eh_entry
) {
260 if (scmd
->device
== sdev
) {
262 if (scmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
)
269 if (cmd_cancel
|| cmd_failed
) {
270 SCSI_LOG_ERROR_RECOVERY(3,
271 sdev_printk(KERN_INFO
, sdev
,
272 "%s: cmds failed: %d, cancel: %d\n",
273 __FUNCTION__
, cmd_failed
,
281 SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d"
282 " devices require eh work\n",
283 total_failures
, devices_failed
));
288 * scsi_check_sense - Examine scsi cmd sense
289 * @scmd: Cmd to have sense checked.
292 * SUCCESS or FAILED or NEEDS_RETRY
295 * When a deferred error is detected the current command has
296 * not been executed and needs retrying.
298 static int scsi_check_sense(struct scsi_cmnd
*scmd
)
300 struct scsi_sense_hdr sshdr
;
302 if (! scsi_command_normalize_sense(scmd
, &sshdr
))
303 return FAILED
; /* no valid sense data */
305 if (scsi_sense_is_deferred(&sshdr
))
309 * Previous logic looked for FILEMARK, EOM or ILI which are
310 * mainly associated with tapes and returned SUCCESS.
312 if (sshdr
.response_code
== 0x70) {
314 if (scmd
->sense_buffer
[2] & 0xe0)
318 * descriptor format: look for "stream commands sense data
319 * descriptor" (see SSC-3). Assume single sense data
320 * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG.
322 if ((sshdr
.additional_length
> 3) &&
323 (scmd
->sense_buffer
[8] == 0x4) &&
324 (scmd
->sense_buffer
[11] & 0xe0))
328 switch (sshdr
.sense_key
) {
331 case RECOVERED_ERROR
:
332 return /* soft_error */ SUCCESS
;
334 case ABORTED_COMMAND
:
339 * if we are expecting a cc/ua because of a bus reset that we
340 * performed, treat this just as a retry. otherwise this is
341 * information that we should pass up to the upper-level driver
342 * so that we can deal with it there.
344 if (scmd
->device
->expecting_cc_ua
) {
345 scmd
->device
->expecting_cc_ua
= 0;
349 * if the device is in the process of becoming ready, we
352 if ((sshdr
.asc
== 0x04) && (sshdr
.ascq
== 0x01))
355 * if the device is not started, we need to wake
356 * the error handler to start the motor
358 if (scmd
->device
->allow_restart
&&
359 (sshdr
.asc
== 0x04) && (sshdr
.ascq
== 0x02))
363 /* these three are not supported */
365 case VOLUME_OVERFLOW
:
370 if (sshdr
.asc
== 0x11 || /* UNRECOVERED READ ERR */
371 sshdr
.asc
== 0x13 || /* AMNF DATA FIELD */
372 sshdr
.asc
== 0x14) { /* RECORD NOT FOUND */
378 if (scmd
->device
->retry_hwerror
)
383 case ILLEGAL_REQUEST
:
392 * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD.
393 * @scmd: SCSI cmd to examine.
396 * This is *only* called when we are examining the status of commands
397 * queued during error recovery. the main difference here is that we
398 * don't allow for the possibility of retries here, and we are a lot
399 * more restrictive about what we consider acceptable.
401 static int scsi_eh_completed_normally(struct scsi_cmnd
*scmd
)
404 * first check the host byte, to see if there is anything in there
405 * that would indicate what we need to do.
407 if (host_byte(scmd
->result
) == DID_RESET
) {
409 * rats. we are already in the error handler, so we now
410 * get to try and figure out what to do next. if the sense
411 * is valid, we have a pretty good idea of what to do.
412 * if not, we mark it as FAILED.
414 return scsi_check_sense(scmd
);
416 if (host_byte(scmd
->result
) != DID_OK
)
420 * next, check the message byte.
422 if (msg_byte(scmd
->result
) != COMMAND_COMPLETE
)
426 * now, check the status byte to see if this indicates
429 switch (status_byte(scmd
->result
)) {
431 case COMMAND_TERMINATED
:
433 case CHECK_CONDITION
:
434 return scsi_check_sense(scmd
);
436 case INTERMEDIATE_GOOD
:
437 case INTERMEDIATE_C_GOOD
:
439 * who knows? FIXME(eric)
444 case RESERVATION_CONFLICT
:
452 * scsi_eh_done - Completion function for error handling.
453 * @scmd: Cmd that is done.
455 static void scsi_eh_done(struct scsi_cmnd
*scmd
)
457 struct completion
*eh_action
;
459 SCSI_LOG_ERROR_RECOVERY(3,
460 printk("%s scmd: %p result: %x\n",
461 __FUNCTION__
, scmd
, scmd
->result
));
463 eh_action
= scmd
->device
->host
->eh_action
;
469 * scsi_try_host_reset - ask host adapter to reset itself
470 * @scmd: SCSI cmd to send hsot reset.
472 static int scsi_try_host_reset(struct scsi_cmnd
*scmd
)
477 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
480 if (!scmd
->device
->host
->hostt
->eh_host_reset_handler
)
483 rtn
= scmd
->device
->host
->hostt
->eh_host_reset_handler(scmd
);
485 if (rtn
== SUCCESS
) {
486 if (!scmd
->device
->host
->hostt
->skip_settle_delay
)
487 ssleep(HOST_RESET_SETTLE_TIME
);
488 spin_lock_irqsave(scmd
->device
->host
->host_lock
, flags
);
489 scsi_report_bus_reset(scmd
->device
->host
,
491 spin_unlock_irqrestore(scmd
->device
->host
->host_lock
, flags
);
498 * scsi_try_bus_reset - ask host to perform a bus reset
499 * @scmd: SCSI cmd to send bus reset.
501 static int scsi_try_bus_reset(struct scsi_cmnd
*scmd
)
506 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
509 if (!scmd
->device
->host
->hostt
->eh_bus_reset_handler
)
512 rtn
= scmd
->device
->host
->hostt
->eh_bus_reset_handler(scmd
);
514 if (rtn
== SUCCESS
) {
515 if (!scmd
->device
->host
->hostt
->skip_settle_delay
)
516 ssleep(BUS_RESET_SETTLE_TIME
);
517 spin_lock_irqsave(scmd
->device
->host
->host_lock
, flags
);
518 scsi_report_bus_reset(scmd
->device
->host
,
520 spin_unlock_irqrestore(scmd
->device
->host
->host_lock
, flags
);
527 * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
528 * @scmd: SCSI cmd used to send BDR
531 * There is no timeout for this operation. if this operation is
532 * unreliable for a given host, then the host itself needs to put a
533 * timer on it, and set the host back to a consistent state prior to
536 static int scsi_try_bus_device_reset(struct scsi_cmnd
*scmd
)
540 if (!scmd
->device
->host
->hostt
->eh_device_reset_handler
)
543 rtn
= scmd
->device
->host
->hostt
->eh_device_reset_handler(scmd
);
544 if (rtn
== SUCCESS
) {
545 scmd
->device
->was_reset
= 1;
546 scmd
->device
->expecting_cc_ua
= 1;
552 static int __scsi_try_to_abort_cmd(struct scsi_cmnd
*scmd
)
554 if (!scmd
->device
->host
->hostt
->eh_abort_handler
)
557 return scmd
->device
->host
->hostt
->eh_abort_handler(scmd
);
561 * scsi_try_to_abort_cmd - Ask host to abort a running command.
562 * @scmd: SCSI cmd to abort from Lower Level.
565 * This function will not return until the user's completion function
566 * has been called. there is no timeout on this operation. if the
567 * author of the low-level driver wishes this operation to be timed,
568 * they can provide this facility themselves. helper functions in
569 * scsi_error.c can be supplied to make this easier to do.
571 static int scsi_try_to_abort_cmd(struct scsi_cmnd
*scmd
)
574 * scsi_done was called just after the command timed out and before
575 * we had a chance to process it. (db)
577 if (scmd
->serial_number
== 0)
579 return __scsi_try_to_abort_cmd(scmd
);
582 static void scsi_abort_eh_cmnd(struct scsi_cmnd
*scmd
)
584 if (__scsi_try_to_abort_cmd(scmd
) != SUCCESS
)
585 if (scsi_try_bus_device_reset(scmd
) != SUCCESS
)
586 if (scsi_try_bus_reset(scmd
) != SUCCESS
)
587 scsi_try_host_reset(scmd
);
591 * scsi_send_eh_cmnd - submit a scsi command as part of error recory
592 * @scmd: SCSI command structure to hijack
594 * @cmnd_size: size in bytes of @cmnd
595 * @timeout: timeout for this request
596 * @copy_sense: request sense data if set to 1
598 * This function is used to send a scsi command down to a target device
599 * as part of the error recovery process. If @copy_sense is 0 the command
600 * sent must be one that does not transfer any data. If @copy_sense is 1
601 * the command must be REQUEST_SENSE and this functions copies out the
602 * sense buffer it got into @scmd->sense_buffer.
605 * SUCCESS or FAILED or NEEDS_RETRY
607 static int scsi_send_eh_cmnd(struct scsi_cmnd
*scmd
, unsigned char *cmnd
,
608 int cmnd_size
, int timeout
, int copy_sense
)
610 struct scsi_device
*sdev
= scmd
->device
;
611 struct Scsi_Host
*shost
= sdev
->host
;
612 int old_result
= scmd
->result
;
613 DECLARE_COMPLETION_ONSTACK(done
);
614 unsigned long timeleft
;
616 struct scatterlist sgl
;
617 unsigned char old_cmnd
[MAX_COMMAND_SIZE
];
618 enum dma_data_direction old_data_direction
;
619 unsigned short old_use_sg
;
620 unsigned char old_cmd_len
;
621 unsigned old_bufflen
;
626 * We need saved copies of a number of fields - this is because
627 * error handling may need to overwrite these with different values
628 * to run different commands, and once error handling is complete,
629 * we will need to restore these values prior to running the actual
632 old_buffer
= scmd
->request_buffer
;
633 old_bufflen
= scmd
->request_bufflen
;
634 memcpy(old_cmnd
, scmd
->cmnd
, sizeof(scmd
->cmnd
));
635 old_data_direction
= scmd
->sc_data_direction
;
636 old_cmd_len
= scmd
->cmd_len
;
637 old_use_sg
= scmd
->use_sg
;
639 memset(scmd
->cmnd
, 0, sizeof(scmd
->cmnd
));
640 memcpy(scmd
->cmnd
, cmnd
, cmnd_size
);
643 sg_init_one(&sgl
, scmd
->sense_buffer
,
644 sizeof(scmd
->sense_buffer
));
646 scmd
->sc_data_direction
= DMA_FROM_DEVICE
;
647 scmd
->request_bufflen
= sgl
.length
;
648 scmd
->request_buffer
= &sgl
;
651 scmd
->request_buffer
= NULL
;
652 scmd
->request_bufflen
= 0;
653 scmd
->sc_data_direction
= DMA_NONE
;
658 scmd
->cmd_len
= COMMAND_SIZE(scmd
->cmnd
[0]);
660 if (sdev
->scsi_level
<= SCSI_2
)
661 scmd
->cmnd
[1] = (scmd
->cmnd
[1] & 0x1f) |
662 (sdev
->lun
<< 5 & 0xe0);
665 * Zero the sense buffer. The scsi spec mandates that any
666 * untransferred sense data should be interpreted as being zero.
668 memset(scmd
->sense_buffer
, 0, sizeof(scmd
->sense_buffer
));
670 shost
->eh_action
= &done
;
672 spin_lock_irqsave(shost
->host_lock
, flags
);
674 shost
->hostt
->queuecommand(scmd
, scsi_eh_done
);
675 spin_unlock_irqrestore(shost
->host_lock
, flags
);
677 timeleft
= wait_for_completion_timeout(&done
, timeout
);
679 shost
->eh_action
= NULL
;
681 scsi_log_completion(scmd
, SUCCESS
);
683 SCSI_LOG_ERROR_RECOVERY(3,
684 printk("%s: scmd: %p, timeleft: %ld\n",
685 __FUNCTION__
, scmd
, timeleft
));
688 * If there is time left scsi_eh_done got called, and we will
689 * examine the actual status codes to see whether the command
690 * actually did complete normally, else tell the host to forget
691 * about this command.
694 rtn
= scsi_eh_completed_normally(scmd
);
695 SCSI_LOG_ERROR_RECOVERY(3,
696 printk("%s: scsi_eh_completed_normally %x\n",
709 scsi_abort_eh_cmnd(scmd
);
715 * Restore original data
717 scmd
->request_buffer
= old_buffer
;
718 scmd
->request_bufflen
= old_bufflen
;
719 memcpy(scmd
->cmnd
, old_cmnd
, sizeof(scmd
->cmnd
));
720 scmd
->sc_data_direction
= old_data_direction
;
721 scmd
->cmd_len
= old_cmd_len
;
722 scmd
->use_sg
= old_use_sg
;
723 scmd
->result
= old_result
;
728 * scsi_request_sense - Request sense data from a particular target.
729 * @scmd: SCSI cmd for request sense.
732 * Some hosts automatically obtain this information, others require
733 * that we obtain it on our own. This function will *not* return until
734 * the command either times out, or it completes.
736 static int scsi_request_sense(struct scsi_cmnd
*scmd
)
738 static unsigned char generic_sense
[6] =
739 {REQUEST_SENSE
, 0, 0, 0, 252, 0};
741 return scsi_send_eh_cmnd(scmd
, generic_sense
, 6, SENSE_TIMEOUT
, 1);
745 * scsi_eh_finish_cmd - Handle a cmd that eh is finished with.
746 * @scmd: Original SCSI cmd that eh has finished.
747 * @done_q: Queue for processed commands.
750 * We don't want to use the normal command completion while we are are
751 * still handling errors - it may cause other commands to be queued,
752 * and that would disturb what we are doing. thus we really want to
753 * keep a list of pending commands for final completion, and once we
754 * are ready to leave error handling we handle completion for real.
756 void scsi_eh_finish_cmd(struct scsi_cmnd
*scmd
, struct list_head
*done_q
)
758 scmd
->device
->host
->host_failed
--;
760 list_move_tail(&scmd
->eh_entry
, done_q
);
762 EXPORT_SYMBOL(scsi_eh_finish_cmd
);
765 * scsi_eh_get_sense - Get device sense data.
766 * @work_q: Queue of commands to process.
767 * @done_q: Queue of proccessed commands..
770 * See if we need to request sense information. if so, then get it
771 * now, so we have a better idea of what to do.
774 * This has the unfortunate side effect that if a shost adapter does
775 * not automatically request sense information, that we end up shutting
776 * it down before we request it.
778 * All drivers should request sense information internally these days,
779 * so for now all I have to say is tough noogies if you end up in here.
781 * XXX: Long term this code should go away, but that needs an audit of
784 int scsi_eh_get_sense(struct list_head
*work_q
,
785 struct list_head
*done_q
)
787 struct scsi_cmnd
*scmd
, *next
;
790 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
791 if ((scmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
) ||
792 SCSI_SENSE_VALID(scmd
))
795 SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO
, scmd
,
796 "%s: requesting sense\n",
798 rtn
= scsi_request_sense(scmd
);
802 SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p"
803 " result %x\n", scmd
,
805 SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd
));
807 rtn
= scsi_decide_disposition(scmd
);
810 * if the result was normal, then just pass it along to the
814 /* we don't want this command reissued, just
815 * finished with the sense data, so set
816 * retries to the max allowed to ensure it
817 * won't get reissued */
818 scmd
->retries
= scmd
->allowed
;
819 else if (rtn
!= NEEDS_RETRY
)
822 scsi_eh_finish_cmd(scmd
, done_q
);
825 return list_empty(work_q
);
827 EXPORT_SYMBOL_GPL(scsi_eh_get_sense
);
830 * scsi_eh_tur - Send TUR to device.
831 * @scmd: Scsi cmd to send TUR
834 * 0 - Device is ready. 1 - Device NOT ready.
836 static int scsi_eh_tur(struct scsi_cmnd
*scmd
)
838 static unsigned char tur_command
[6] = {TEST_UNIT_READY
, 0, 0, 0, 0, 0};
839 int retry_cnt
= 1, rtn
;
842 rtn
= scsi_send_eh_cmnd(scmd
, tur_command
, 6, SENSE_TIMEOUT
, 0);
844 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
845 __FUNCTION__
, scmd
, rtn
));
860 * scsi_eh_abort_cmds - abort canceled commands.
861 * @shost: scsi host being recovered.
862 * @eh_done_q: list_head for processed commands.
865 * Try and see whether or not it makes sense to try and abort the
866 * running command. this only works out to be the case if we have one
867 * command that has timed out. if the command simply failed, it makes
868 * no sense to try and abort the command, since as far as the shost
869 * adapter is concerned, it isn't running.
871 static int scsi_eh_abort_cmds(struct list_head
*work_q
,
872 struct list_head
*done_q
)
874 struct scsi_cmnd
*scmd
, *next
;
877 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
878 if (!(scmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
))
880 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:"
881 "0x%p\n", current
->comm
,
883 rtn
= scsi_try_to_abort_cmd(scmd
);
884 if (rtn
== SUCCESS
) {
885 scmd
->eh_eflags
&= ~SCSI_EH_CANCEL_CMD
;
886 if (!scsi_device_online(scmd
->device
) ||
887 !scsi_eh_tur(scmd
)) {
888 scsi_eh_finish_cmd(scmd
, done_q
);
892 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting"
899 return list_empty(work_q
);
903 * scsi_eh_try_stu - Send START_UNIT to device.
904 * @scmd: Scsi cmd to send START_UNIT
907 * 0 - Device is ready. 1 - Device NOT ready.
909 static int scsi_eh_try_stu(struct scsi_cmnd
*scmd
)
911 static unsigned char stu_command
[6] = {START_STOP
, 0, 0, 0, 1, 0};
913 if (scmd
->device
->allow_restart
) {
914 int i
, rtn
= NEEDS_RETRY
;
916 for (i
= 0; rtn
== NEEDS_RETRY
&& i
< 2; i
++)
917 rtn
= scsi_send_eh_cmnd(scmd
, stu_command
, 6,
918 scmd
->device
->timeout
, 0);
928 * scsi_eh_stu - send START_UNIT if needed
929 * @shost: scsi host being recovered.
930 * @eh_done_q: list_head for processed commands.
933 * If commands are failing due to not ready, initializing command required,
934 * try revalidating the device, which will end up sending a start unit.
936 static int scsi_eh_stu(struct Scsi_Host
*shost
,
937 struct list_head
*work_q
,
938 struct list_head
*done_q
)
940 struct scsi_cmnd
*scmd
, *stu_scmd
, *next
;
941 struct scsi_device
*sdev
;
943 shost_for_each_device(sdev
, shost
) {
945 list_for_each_entry(scmd
, work_q
, eh_entry
)
946 if (scmd
->device
== sdev
&& SCSI_SENSE_VALID(scmd
) &&
947 scsi_check_sense(scmd
) == FAILED
) {
955 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:"
956 " 0x%p\n", current
->comm
, sdev
));
958 if (!scsi_eh_try_stu(stu_scmd
)) {
959 if (!scsi_device_online(sdev
) ||
960 !scsi_eh_tur(stu_scmd
)) {
961 list_for_each_entry_safe(scmd
, next
,
963 if (scmd
->device
== sdev
)
964 scsi_eh_finish_cmd(scmd
, done_q
);
968 SCSI_LOG_ERROR_RECOVERY(3,
969 printk("%s: START_UNIT failed to sdev:"
970 " 0x%p\n", current
->comm
, sdev
));
974 return list_empty(work_q
);
979 * scsi_eh_bus_device_reset - send bdr if needed
980 * @shost: scsi host being recovered.
981 * @eh_done_q: list_head for processed commands.
984 * Try a bus device reset. still, look to see whether we have multiple
985 * devices that are jammed or not - if we have multiple devices, it
986 * makes no sense to try bus_device_reset - we really would need to try
987 * a bus_reset instead.
989 static int scsi_eh_bus_device_reset(struct Scsi_Host
*shost
,
990 struct list_head
*work_q
,
991 struct list_head
*done_q
)
993 struct scsi_cmnd
*scmd
, *bdr_scmd
, *next
;
994 struct scsi_device
*sdev
;
997 shost_for_each_device(sdev
, shost
) {
999 list_for_each_entry(scmd
, work_q
, eh_entry
)
1000 if (scmd
->device
== sdev
) {
1008 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:"
1009 " 0x%p\n", current
->comm
,
1011 rtn
= scsi_try_bus_device_reset(bdr_scmd
);
1012 if (rtn
== SUCCESS
) {
1013 if (!scsi_device_online(sdev
) ||
1014 !scsi_eh_tur(bdr_scmd
)) {
1015 list_for_each_entry_safe(scmd
, next
,
1017 if (scmd
->device
== sdev
)
1018 scsi_eh_finish_cmd(scmd
,
1023 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR"
1031 return list_empty(work_q
);
1035 * scsi_eh_bus_reset - send a bus reset
1036 * @shost: scsi host being recovered.
1037 * @eh_done_q: list_head for processed commands.
1039 static int scsi_eh_bus_reset(struct Scsi_Host
*shost
,
1040 struct list_head
*work_q
,
1041 struct list_head
*done_q
)
1043 struct scsi_cmnd
*scmd
, *chan_scmd
, *next
;
1044 unsigned int channel
;
1048 * we really want to loop over the various channels, and do this on
1049 * a channel by channel basis. we should also check to see if any
1050 * of the failed commands are on soft_reset devices, and if so, skip
1054 for (channel
= 0; channel
<= shost
->max_channel
; channel
++) {
1056 list_for_each_entry(scmd
, work_q
, eh_entry
) {
1057 if (channel
== scmd_channel(scmd
)) {
1061 * FIXME add back in some support for
1062 * soft_reset devices.
1069 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:"
1070 " %d\n", current
->comm
,
1072 rtn
= scsi_try_bus_reset(chan_scmd
);
1073 if (rtn
== SUCCESS
) {
1074 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1075 if (channel
== scmd_channel(scmd
))
1076 if (!scsi_device_online(scmd
->device
) ||
1078 scsi_eh_finish_cmd(scmd
,
1082 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST"
1083 " failed chan: %d\n",
1088 return list_empty(work_q
);
1092 * scsi_eh_host_reset - send a host reset
1093 * @work_q: list_head for processed commands.
1094 * @done_q: list_head for processed commands.
1096 static int scsi_eh_host_reset(struct list_head
*work_q
,
1097 struct list_head
*done_q
)
1099 struct scsi_cmnd
*scmd
, *next
;
1102 if (!list_empty(work_q
)) {
1103 scmd
= list_entry(work_q
->next
,
1104 struct scsi_cmnd
, eh_entry
);
1106 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n"
1109 rtn
= scsi_try_host_reset(scmd
);
1110 if (rtn
== SUCCESS
) {
1111 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1112 if (!scsi_device_online(scmd
->device
) ||
1113 (!scsi_eh_try_stu(scmd
) && !scsi_eh_tur(scmd
)) ||
1115 scsi_eh_finish_cmd(scmd
, done_q
);
1118 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST"
1123 return list_empty(work_q
);
1127 * scsi_eh_offline_sdevs - offline scsi devices that fail to recover
1128 * @work_q: list_head for processed commands.
1129 * @done_q: list_head for processed commands.
1132 static void scsi_eh_offline_sdevs(struct list_head
*work_q
,
1133 struct list_head
*done_q
)
1135 struct scsi_cmnd
*scmd
, *next
;
1137 list_for_each_entry_safe(scmd
, next
, work_q
, eh_entry
) {
1138 sdev_printk(KERN_INFO
, scmd
->device
,
1139 "scsi: Device offlined - not"
1140 " ready after error recovery\n");
1141 scsi_device_set_state(scmd
->device
, SDEV_OFFLINE
);
1142 if (scmd
->eh_eflags
& SCSI_EH_CANCEL_CMD
) {
1144 * FIXME: Handle lost cmds.
1147 scsi_eh_finish_cmd(scmd
, done_q
);
1153 * scsi_decide_disposition - Disposition a cmd on return from LLD.
1154 * @scmd: SCSI cmd to examine.
1157 * This is *only* called when we are examining the status after sending
1158 * out the actual data command. any commands that are queued for error
1159 * recovery (e.g. test_unit_ready) do *not* come through here.
1161 * When this routine returns failed, it means the error handler thread
1162 * is woken. In cases where the error code indicates an error that
1163 * doesn't require the error handler read (i.e. we don't need to
1164 * abort/reset), this function should return SUCCESS.
1166 int scsi_decide_disposition(struct scsi_cmnd
*scmd
)
1171 * if the device is offline, then we clearly just pass the result back
1172 * up to the top level.
1174 if (!scsi_device_online(scmd
->device
)) {
1175 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report"
1182 * first check the host byte, to see if there is anything in there
1183 * that would indicate what we need to do.
1185 switch (host_byte(scmd
->result
)) {
1186 case DID_PASSTHROUGH
:
1188 * no matter what, pass this through to the upper layer.
1189 * nuke this special code so that it looks like we are saying
1192 scmd
->result
&= 0xff00ffff;
1196 * looks good. drop through, and check the next byte.
1199 case DID_NO_CONNECT
:
1200 case DID_BAD_TARGET
:
1203 * note - this means that we just report the status back
1204 * to the top level driver, not that we actually think
1205 * that it indicates SUCCESS.
1209 * when the low level driver returns did_soft_error,
1210 * it is responsible for keeping an internal retry counter
1211 * in order to avoid endless loops (db)
1213 * actually this is a bug in this function here. we should
1214 * be mindful of the maximum number of retries specified
1215 * and not get stuck in a loop.
1217 case DID_SOFT_ERROR
:
1223 return ADD_TO_MLQUEUE
;
1226 if (msg_byte(scmd
->result
) == COMMAND_COMPLETE
&&
1227 status_byte(scmd
->result
) == RESERVATION_CONFLICT
)
1229 * execute reservation conflict processing code
1240 * when we scan the bus, we get timeout messages for
1241 * these commands if there is no device available.
1242 * other hosts report did_no_connect for the same thing.
1244 if ((scmd
->cmnd
[0] == TEST_UNIT_READY
||
1245 scmd
->cmnd
[0] == INQUIRY
)) {
1257 * next, check the message byte.
1259 if (msg_byte(scmd
->result
) != COMMAND_COMPLETE
)
1263 * check the status byte to see if this indicates anything special.
1265 switch (status_byte(scmd
->result
)) {
1268 * the case of trying to send too many commands to a
1269 * tagged queueing device.
1273 * device can't talk to us at the moment. Should only
1274 * occur (SAM-3) when the task queue is empty, so will cause
1275 * the empty queue handling to trigger a stall in the
1278 return ADD_TO_MLQUEUE
;
1280 case COMMAND_TERMINATED
:
1283 case CHECK_CONDITION
:
1284 rtn
= scsi_check_sense(scmd
);
1285 if (rtn
== NEEDS_RETRY
)
1287 /* if rtn == FAILED, we have no sense information;
1288 * returning FAILED will wake the error handler thread
1289 * to collect the sense and redo the decide
1292 case CONDITION_GOOD
:
1293 case INTERMEDIATE_GOOD
:
1294 case INTERMEDIATE_C_GOOD
:
1297 * who knows? FIXME(eric)
1301 case RESERVATION_CONFLICT
:
1302 sdev_printk(KERN_INFO
, scmd
->device
,
1303 "reservation conflict\n");
1304 return SUCCESS
; /* causes immediate i/o error */
1312 /* we requeue for retry because the error was retryable, and
1313 * the request was not marked fast fail. Note that above,
1314 * even if the request is marked fast fail, we still requeue
1315 * for queue congestion conditions (QUEUE_FULL or BUSY) */
1316 if ((++scmd
->retries
) <= scmd
->allowed
1317 && !blk_noretry_request(scmd
->request
)) {
1321 * no more retries - report this one back to upper level.
1328 * scsi_eh_lock_door - Prevent medium removal for the specified device
1329 * @sdev: SCSI device to prevent medium removal
1332 * We must be called from process context; scsi_allocate_request()
1336 * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the
1337 * head of the devices request queue, and continue.
1340 * scsi_allocate_request() may sleep waiting for existing requests to
1341 * be processed. However, since we haven't kicked off any request
1342 * processing for this host, this may deadlock.
1344 * If scsi_allocate_request() fails for what ever reason, we
1345 * completely forget to lock the door.
1347 static void scsi_eh_lock_door(struct scsi_device
*sdev
)
1349 unsigned char cmnd
[MAX_COMMAND_SIZE
];
1351 cmnd
[0] = ALLOW_MEDIUM_REMOVAL
;
1355 cmnd
[4] = SCSI_REMOVAL_PREVENT
;
1358 scsi_execute_async(sdev
, cmnd
, 6, DMA_NONE
, NULL
, 0, 0, 10 * HZ
,
1359 5, NULL
, NULL
, GFP_KERNEL
);
1364 * scsi_restart_operations - restart io operations to the specified host.
1365 * @shost: Host we are restarting.
1368 * When we entered the error handler, we blocked all further i/o to
1369 * this device. we need to 'reverse' this process.
1371 static void scsi_restart_operations(struct Scsi_Host
*shost
)
1373 struct scsi_device
*sdev
;
1374 unsigned long flags
;
1377 * If the door was locked, we need to insert a door lock request
1378 * onto the head of the SCSI request queue for the device. There
1379 * is no point trying to lock the door of an off-line device.
1381 shost_for_each_device(sdev
, shost
) {
1382 if (scsi_device_online(sdev
) && sdev
->locked
)
1383 scsi_eh_lock_door(sdev
);
1387 * next free up anything directly waiting upon the host. this
1388 * will be requests for character device operations, and also for
1389 * ioctls to queued block devices.
1391 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n",
1394 spin_lock_irqsave(shost
->host_lock
, flags
);
1395 if (scsi_host_set_state(shost
, SHOST_RUNNING
))
1396 if (scsi_host_set_state(shost
, SHOST_CANCEL
))
1397 BUG_ON(scsi_host_set_state(shost
, SHOST_DEL
));
1398 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1400 wake_up(&shost
->host_wait
);
1403 * finally we need to re-initiate requests that may be pending. we will
1404 * have had everything blocked while error handling is taking place, and
1405 * now that error recovery is done, we will need to ensure that these
1406 * requests are started.
1408 scsi_run_host_queues(shost
);
1412 * scsi_eh_ready_devs - check device ready state and recover if not.
1413 * @shost: host to be recovered.
1414 * @eh_done_q: list_head for processed commands.
1417 void scsi_eh_ready_devs(struct Scsi_Host
*shost
,
1418 struct list_head
*work_q
,
1419 struct list_head
*done_q
)
1421 if (!scsi_eh_stu(shost
, work_q
, done_q
))
1422 if (!scsi_eh_bus_device_reset(shost
, work_q
, done_q
))
1423 if (!scsi_eh_bus_reset(shost
, work_q
, done_q
))
1424 if (!scsi_eh_host_reset(work_q
, done_q
))
1425 scsi_eh_offline_sdevs(work_q
, done_q
);
1427 EXPORT_SYMBOL_GPL(scsi_eh_ready_devs
);
1430 * scsi_eh_flush_done_q - finish processed commands or retry them.
1431 * @done_q: list_head of processed commands.
1434 void scsi_eh_flush_done_q(struct list_head
*done_q
)
1436 struct scsi_cmnd
*scmd
, *next
;
1438 list_for_each_entry_safe(scmd
, next
, done_q
, eh_entry
) {
1439 list_del_init(&scmd
->eh_entry
);
1440 if (scsi_device_online(scmd
->device
) &&
1441 !blk_noretry_request(scmd
->request
) &&
1442 (++scmd
->retries
<= scmd
->allowed
)) {
1443 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush"
1447 scsi_queue_insert(scmd
, SCSI_MLQUEUE_EH_RETRY
);
1450 * If just we got sense for the device (called
1451 * scsi_eh_get_sense), scmd->result is already
1452 * set, do not set DRIVER_TIMEOUT.
1455 scmd
->result
|= (DRIVER_TIMEOUT
<< 24);
1456 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish"
1458 current
->comm
, scmd
));
1459 scsi_finish_command(scmd
);
1463 EXPORT_SYMBOL(scsi_eh_flush_done_q
);
1466 * scsi_unjam_host - Attempt to fix a host which has a cmd that failed.
1467 * @shost: Host to unjam.
1470 * When we come in here, we *know* that all commands on the bus have
1471 * either completed, failed or timed out. we also know that no further
1472 * commands are being sent to the host, so things are relatively quiet
1473 * and we have freedom to fiddle with things as we wish.
1475 * This is only the *default* implementation. it is possible for
1476 * individual drivers to supply their own version of this function, and
1477 * if the maintainer wishes to do this, it is strongly suggested that
1478 * this function be taken as a template and modified. this function
1479 * was designed to correctly handle problems for about 95% of the
1480 * different cases out there, and it should always provide at least a
1481 * reasonable amount of error recovery.
1483 * Any command marked 'failed' or 'timeout' must eventually have
1484 * scsi_finish_cmd() called for it. we do all of the retry stuff
1485 * here, so when we restart the host after we return it should have an
1488 static void scsi_unjam_host(struct Scsi_Host
*shost
)
1490 unsigned long flags
;
1491 LIST_HEAD(eh_work_q
);
1492 LIST_HEAD(eh_done_q
);
1494 spin_lock_irqsave(shost
->host_lock
, flags
);
1495 list_splice_init(&shost
->eh_cmd_q
, &eh_work_q
);
1496 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1498 SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost
, &eh_work_q
));
1500 if (!scsi_eh_get_sense(&eh_work_q
, &eh_done_q
))
1501 if (!scsi_eh_abort_cmds(&eh_work_q
, &eh_done_q
))
1502 scsi_eh_ready_devs(shost
, &eh_work_q
, &eh_done_q
);
1504 scsi_eh_flush_done_q(&eh_done_q
);
1508 * scsi_error_handler - SCSI error handler thread
1509 * @data: Host for which we are running.
1512 * This is the main error handling loop. This is run as a kernel thread
1513 * for every SCSI host and handles all error handling activity.
1515 int scsi_error_handler(void *data
)
1517 struct Scsi_Host
*shost
= data
;
1519 current
->flags
|= PF_NOFREEZE
;
1522 * We use TASK_INTERRUPTIBLE so that the thread is not
1523 * counted against the load average as a running process.
1524 * We never actually get interrupted because kthread_run
1525 * disables singal delivery for the created thread.
1527 set_current_state(TASK_INTERRUPTIBLE
);
1528 while (!kthread_should_stop()) {
1529 if ((shost
->host_failed
== 0 && shost
->host_eh_scheduled
== 0) ||
1530 shost
->host_failed
!= shost
->host_busy
) {
1531 SCSI_LOG_ERROR_RECOVERY(1,
1532 printk("Error handler scsi_eh_%d sleeping\n",
1535 set_current_state(TASK_INTERRUPTIBLE
);
1539 __set_current_state(TASK_RUNNING
);
1540 SCSI_LOG_ERROR_RECOVERY(1,
1541 printk("Error handler scsi_eh_%d waking up\n",
1545 * We have a host that is failing for some reason. Figure out
1546 * what we need to do to get it up and online again (if we can).
1547 * If we fail, we end up taking the thing offline.
1549 if (shost
->transportt
->eh_strategy_handler
)
1550 shost
->transportt
->eh_strategy_handler(shost
);
1552 scsi_unjam_host(shost
);
1555 * Note - if the above fails completely, the action is to take
1556 * individual devices offline and flush the queue of any
1557 * outstanding requests that may have been pending. When we
1558 * restart, we restart any I/O to any other devices on the bus
1559 * which are still online.
1561 scsi_restart_operations(shost
);
1562 set_current_state(TASK_INTERRUPTIBLE
);
1564 __set_current_state(TASK_RUNNING
);
1566 SCSI_LOG_ERROR_RECOVERY(1,
1567 printk("Error handler scsi_eh_%d exiting\n", shost
->host_no
));
1568 shost
->ehandler
= NULL
;
1573 * Function: scsi_report_bus_reset()
1575 * Purpose: Utility function used by low-level drivers to report that
1576 * they have observed a bus reset on the bus being handled.
1578 * Arguments: shost - Host in question
1579 * channel - channel on which reset was observed.
1583 * Lock status: Host lock must be held.
1585 * Notes: This only needs to be called if the reset is one which
1586 * originates from an unknown location. Resets originated
1587 * by the mid-level itself don't need to call this, but there
1588 * should be no harm.
1590 * The main purpose of this is to make sure that a CHECK_CONDITION
1591 * is properly treated.
1593 void scsi_report_bus_reset(struct Scsi_Host
*shost
, int channel
)
1595 struct scsi_device
*sdev
;
1597 __shost_for_each_device(sdev
, shost
) {
1598 if (channel
== sdev_channel(sdev
)) {
1599 sdev
->was_reset
= 1;
1600 sdev
->expecting_cc_ua
= 1;
1604 EXPORT_SYMBOL(scsi_report_bus_reset
);
1607 * Function: scsi_report_device_reset()
1609 * Purpose: Utility function used by low-level drivers to report that
1610 * they have observed a device reset on the device being handled.
1612 * Arguments: shost - Host in question
1613 * channel - channel on which reset was observed
1614 * target - target on which reset was observed
1618 * Lock status: Host lock must be held
1620 * Notes: This only needs to be called if the reset is one which
1621 * originates from an unknown location. Resets originated
1622 * by the mid-level itself don't need to call this, but there
1623 * should be no harm.
1625 * The main purpose of this is to make sure that a CHECK_CONDITION
1626 * is properly treated.
1628 void scsi_report_device_reset(struct Scsi_Host
*shost
, int channel
, int target
)
1630 struct scsi_device
*sdev
;
1632 __shost_for_each_device(sdev
, shost
) {
1633 if (channel
== sdev_channel(sdev
) &&
1634 target
== sdev_id(sdev
)) {
1635 sdev
->was_reset
= 1;
1636 sdev
->expecting_cc_ua
= 1;
1640 EXPORT_SYMBOL(scsi_report_device_reset
);
1643 scsi_reset_provider_done_command(struct scsi_cmnd
*scmd
)
1648 * Function: scsi_reset_provider
1650 * Purpose: Send requested reset to a bus or device at any phase.
1652 * Arguments: device - device to send reset to
1653 * flag - reset type (see scsi.h)
1655 * Returns: SUCCESS/FAILURE.
1657 * Notes: This is used by the SCSI Generic driver to provide
1658 * Bus/Device reset capability.
1661 scsi_reset_provider(struct scsi_device
*dev
, int flag
)
1663 struct scsi_cmnd
*scmd
= scsi_get_command(dev
, GFP_KERNEL
);
1664 struct Scsi_Host
*shost
= dev
->host
;
1666 unsigned long flags
;
1669 scmd
->request
= &req
;
1670 memset(&scmd
->eh_timeout
, 0, sizeof(scmd
->eh_timeout
));
1672 memset(&scmd
->cmnd
, '\0', sizeof(scmd
->cmnd
));
1674 scmd
->scsi_done
= scsi_reset_provider_done_command
;
1676 scmd
->request_buffer
= NULL
;
1677 scmd
->request_bufflen
= 0;
1681 scmd
->sc_data_direction
= DMA_BIDIRECTIONAL
;
1683 init_timer(&scmd
->eh_timeout
);
1686 * Sometimes the command can get back into the timer chain,
1687 * so use the pid as an identifier.
1691 spin_lock_irqsave(shost
->host_lock
, flags
);
1692 shost
->tmf_in_progress
= 1;
1693 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1696 case SCSI_TRY_RESET_DEVICE
:
1697 rtn
= scsi_try_bus_device_reset(scmd
);
1701 case SCSI_TRY_RESET_BUS
:
1702 rtn
= scsi_try_bus_reset(scmd
);
1706 case SCSI_TRY_RESET_HOST
:
1707 rtn
= scsi_try_host_reset(scmd
);
1713 spin_lock_irqsave(shost
->host_lock
, flags
);
1714 shost
->tmf_in_progress
= 0;
1715 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1718 * be sure to wake up anyone who was sleeping or had their queue
1719 * suspended while we performed the TMF.
1721 SCSI_LOG_ERROR_RECOVERY(3,
1722 printk("%s: waking up host to restart after TMF\n",
1725 wake_up(&shost
->host_wait
);
1727 scsi_run_host_queues(shost
);
1729 scsi_next_command(scmd
);
1732 EXPORT_SYMBOL(scsi_reset_provider
);
1735 * scsi_normalize_sense - normalize main elements from either fixed or
1736 * descriptor sense data format into a common format.
1738 * @sense_buffer: byte array containing sense data returned by device
1739 * @sb_len: number of valid bytes in sense_buffer
1740 * @sshdr: pointer to instance of structure that common
1741 * elements are written to.
1744 * The "main elements" from sense data are: response_code, sense_key,
1745 * asc, ascq and additional_length (only for descriptor format).
1747 * Typically this function can be called after a device has
1748 * responded to a SCSI command with the CHECK_CONDITION status.
1751 * 1 if valid sense data information found, else 0;
1753 int scsi_normalize_sense(const u8
*sense_buffer
, int sb_len
,
1754 struct scsi_sense_hdr
*sshdr
)
1756 if (!sense_buffer
|| !sb_len
)
1759 memset(sshdr
, 0, sizeof(struct scsi_sense_hdr
));
1761 sshdr
->response_code
= (sense_buffer
[0] & 0x7f);
1763 if (!scsi_sense_valid(sshdr
))
1766 if (sshdr
->response_code
>= 0x72) {
1771 sshdr
->sense_key
= (sense_buffer
[1] & 0xf);
1773 sshdr
->asc
= sense_buffer
[2];
1775 sshdr
->ascq
= sense_buffer
[3];
1777 sshdr
->additional_length
= sense_buffer
[7];
1783 sshdr
->sense_key
= (sense_buffer
[2] & 0xf);
1785 sb_len
= (sb_len
< (sense_buffer
[7] + 8)) ?
1786 sb_len
: (sense_buffer
[7] + 8);
1788 sshdr
->asc
= sense_buffer
[12];
1790 sshdr
->ascq
= sense_buffer
[13];
1796 EXPORT_SYMBOL(scsi_normalize_sense
);
1798 int scsi_command_normalize_sense(struct scsi_cmnd
*cmd
,
1799 struct scsi_sense_hdr
*sshdr
)
1801 return scsi_normalize_sense(cmd
->sense_buffer
,
1802 sizeof(cmd
->sense_buffer
), sshdr
);
1804 EXPORT_SYMBOL(scsi_command_normalize_sense
);
1807 * scsi_sense_desc_find - search for a given descriptor type in
1808 * descriptor sense data format.
1810 * @sense_buffer: byte array of descriptor format sense data
1811 * @sb_len: number of valid bytes in sense_buffer
1812 * @desc_type: value of descriptor type to find
1813 * (e.g. 0 -> information)
1816 * only valid when sense data is in descriptor format
1819 * pointer to start of (first) descriptor if found else NULL
1821 const u8
* scsi_sense_desc_find(const u8
* sense_buffer
, int sb_len
,
1824 int add_sen_len
, add_len
, desc_len
, k
;
1827 if ((sb_len
< 8) || (0 == (add_sen_len
= sense_buffer
[7])))
1829 if ((sense_buffer
[0] < 0x72) || (sense_buffer
[0] > 0x73))
1831 add_sen_len
= (add_sen_len
< (sb_len
- 8)) ?
1832 add_sen_len
: (sb_len
- 8);
1833 descp
= &sense_buffer
[8];
1834 for (desc_len
= 0, k
= 0; k
< add_sen_len
; k
+= desc_len
) {
1836 add_len
= (k
< (add_sen_len
- 1)) ? descp
[1]: -1;
1837 desc_len
= add_len
+ 2;
1838 if (descp
[0] == desc_type
)
1840 if (add_len
< 0) // short descriptor ??
1845 EXPORT_SYMBOL(scsi_sense_desc_find
);
1848 * scsi_get_sense_info_fld - attempts to get information field from
1849 * sense data (either fixed or descriptor format)
1851 * @sense_buffer: byte array of sense data
1852 * @sb_len: number of valid bytes in sense_buffer
1853 * @info_out: pointer to 64 integer where 8 or 4 byte information
1854 * field will be placed if found.
1857 * 1 if information field found, 0 if not found.
1859 int scsi_get_sense_info_fld(const u8
* sense_buffer
, int sb_len
,
1868 switch (sense_buffer
[0] & 0x7f) {
1871 if (sense_buffer
[0] & 0x80) {
1872 *info_out
= (sense_buffer
[3] << 24) +
1873 (sense_buffer
[4] << 16) +
1874 (sense_buffer
[5] << 8) + sense_buffer
[6];
1880 ucp
= scsi_sense_desc_find(sense_buffer
, sb_len
,
1882 if (ucp
&& (0xa == ucp
[1])) {
1884 for (j
= 0; j
< 8; ++j
) {
1897 EXPORT_SYMBOL(scsi_get_sense_info_fld
);