2 * scsi_error.c Copyright (C) 1997 Eric Youngdale
4 * SCSI error/timeout handling
5 * Initial versions: Eric Youngdale. Based upon conversations with
6 * Leonard Zubkoff and David Miller at Linux Expo,
7 * ideas originating from all over the place.
9 * Restructured scsi_unjam_host and associated functions.
10 * September 04, 2002 Mike Anderson (andmike@us.ibm.com)
12 * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and
14 * September 30, 2002 Mike Anderson (andmike@us.ibm.com)
17 #include <linux/module.h>
18 #include <linux/sched.h>
19 #include <linux/gfp.h>
20 #include <linux/timer.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <linux/freezer.h>
24 #include <linux/kthread.h>
25 #include <linux/interrupt.h>
26 #include <linux/blkdev.h>
27 #include <linux/delay.h>
28 #include <linux/jiffies.h>
30 #include <scsi/scsi.h>
31 #include <scsi/scsi_cmnd.h>
32 #include <scsi/scsi_dbg.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_driver.h>
35 #include <scsi/scsi_eh.h>
36 #include <scsi/scsi_common.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_host.h>
39 #include <scsi/scsi_ioctl.h>
40 #include <scsi/scsi_dh.h>
43 #include "scsi_priv.h"
44 #include "scsi_logging.h"
45 #include "scsi_transport_api.h"
47 #include <trace/events/scsi.h>
49 static void scsi_eh_done(struct scsi_cmnd *scmd);
52 * These should *probably* be handled by the host itself.
53 * Since it is allowed to sleep, it probably should.
55 #define BUS_RESET_SETTLE_TIME (10)
56 #define HOST_RESET_SETTLE_TIME (10)
58 static int scsi_eh_try_stu(struct scsi_cmnd *scmd);
59 static int scsi_try_to_abort_cmd(struct scsi_host_template *,
62 /* called with shost->host_lock held */
63 void scsi_eh_wakeup(struct Scsi_Host *shost)
65 if (atomic_read(&shost->host_busy) == shost->host_failed) {
66 trace_scsi_eh_wakeup(shost);
67 wake_up_process(shost->ehandler);
68 SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost,
69 "Waking error handler thread\n"));
74 * scsi_schedule_eh - schedule EH for SCSI host
75 * @shost: SCSI host to invoke error handling on.
77 * Schedule SCSI EH without scmd.
79 void scsi_schedule_eh(struct Scsi_Host *shost)
83 spin_lock_irqsave(shost->host_lock, flags);
85 if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 ||
86 scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) {
87 shost->host_eh_scheduled++;
88 scsi_eh_wakeup(shost);
91 spin_unlock_irqrestore(shost->host_lock, flags);
93 EXPORT_SYMBOL_GPL(scsi_schedule_eh);
95 static int scsi_host_eh_past_deadline(struct Scsi_Host *shost)
97 if (!shost->last_reset || shost->eh_deadline == -1)
101 * 32bit accesses are guaranteed to be atomic
102 * (on all supported architectures), so instead
103 * of using a spinlock we can as well double check
104 * if eh_deadline has been set to 'off' during the
107 if (time_before(jiffies, shost->last_reset + shost->eh_deadline) &&
108 shost->eh_deadline > -1)
115 * scmd_eh_abort_handler - Handle command aborts
116 * @work: command to be aborted.
119 scmd_eh_abort_handler(struct work_struct *work)
121 struct scsi_cmnd *scmd =
122 container_of(work, struct scsi_cmnd, abort_work.work);
123 struct scsi_device *sdev = scmd->device;
126 if (scsi_host_eh_past_deadline(sdev->host)) {
127 SCSI_LOG_ERROR_RECOVERY(3,
128 scmd_printk(KERN_INFO, scmd,
129 "eh timeout, not aborting\n"));
131 SCSI_LOG_ERROR_RECOVERY(3,
132 scmd_printk(KERN_INFO, scmd,
133 "aborting command\n"));
134 rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd);
135 if (rtn == SUCCESS) {
136 set_host_byte(scmd, DID_TIME_OUT);
137 if (scsi_host_eh_past_deadline(sdev->host)) {
138 SCSI_LOG_ERROR_RECOVERY(3,
139 scmd_printk(KERN_INFO, scmd,
140 "eh timeout, not retrying "
141 "aborted command\n"));
142 } else if (!scsi_noretry_cmd(scmd) &&
143 (++scmd->retries <= scmd->allowed)) {
144 SCSI_LOG_ERROR_RECOVERY(3,
145 scmd_printk(KERN_WARNING, scmd,
146 "retry aborted command\n"));
147 scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY);
150 SCSI_LOG_ERROR_RECOVERY(3,
151 scmd_printk(KERN_WARNING, scmd,
152 "finish aborted command\n"));
153 scsi_finish_command(scmd);
157 SCSI_LOG_ERROR_RECOVERY(3,
158 scmd_printk(KERN_INFO, scmd,
160 (rtn == FAST_IO_FAIL) ?
161 "not send" : "failed"));
165 if (!scsi_eh_scmd_add(scmd, 0)) {
166 SCSI_LOG_ERROR_RECOVERY(3,
167 scmd_printk(KERN_WARNING, scmd,
168 "terminate aborted command\n"));
169 set_host_byte(scmd, DID_TIME_OUT);
170 scsi_finish_command(scmd);
175 * scsi_abort_command - schedule a command abort
176 * @scmd: scmd to abort.
178 * We only need to abort commands after a command timeout
181 scsi_abort_command(struct scsi_cmnd *scmd)
183 struct scsi_device *sdev = scmd->device;
184 struct Scsi_Host *shost = sdev->host;
187 if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) {
189 * Retry after abort failed, escalate to next level.
191 scmd->eh_eflags &= ~SCSI_EH_ABORT_SCHEDULED;
192 SCSI_LOG_ERROR_RECOVERY(3,
193 scmd_printk(KERN_INFO, scmd,
194 "previous abort failed\n"));
195 BUG_ON(delayed_work_pending(&scmd->abort_work));
200 * Do not try a command abort if
201 * SCSI EH has already started.
203 spin_lock_irqsave(shost->host_lock, flags);
204 if (scsi_host_in_recovery(shost)) {
205 spin_unlock_irqrestore(shost->host_lock, flags);
206 SCSI_LOG_ERROR_RECOVERY(3,
207 scmd_printk(KERN_INFO, scmd,
208 "not aborting, host in recovery\n"));
212 if (shost->eh_deadline != -1 && !shost->last_reset)
213 shost->last_reset = jiffies;
214 spin_unlock_irqrestore(shost->host_lock, flags);
216 scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED;
217 SCSI_LOG_ERROR_RECOVERY(3,
218 scmd_printk(KERN_INFO, scmd, "abort scheduled\n"));
219 queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100);
224 * scsi_eh_scmd_add - add scsi cmd to error handling.
225 * @scmd: scmd to run eh on.
226 * @eh_flag: optional SCSI_EH flag.
231 int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
233 struct Scsi_Host *shost = scmd->device->host;
237 if (!shost->ehandler)
240 spin_lock_irqsave(shost->host_lock, flags);
241 if (scsi_host_set_state(shost, SHOST_RECOVERY))
242 if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY))
245 if (shost->eh_deadline != -1 && !shost->last_reset)
246 shost->last_reset = jiffies;
249 if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED)
250 eh_flag &= ~SCSI_EH_CANCEL_CMD;
251 scmd->eh_eflags |= eh_flag;
252 list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q);
253 shost->host_failed++;
254 scsi_eh_wakeup(shost);
256 spin_unlock_irqrestore(shost->host_lock, flags);
261 * scsi_times_out - Timeout function for normal scsi commands.
262 * @req: request that is timing out.
265 * We do not need to lock this. There is the potential for a race
266 * only in that the normal completion handling might run, but if the
267 * normal completion function determines that the timer has already
268 * fired, then it mustn't do anything.
270 enum blk_eh_timer_return scsi_times_out(struct request *req)
272 struct scsi_cmnd *scmd = req->special;
273 enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED;
274 struct Scsi_Host *host = scmd->device->host;
276 trace_scsi_dispatch_cmd_timeout(scmd);
277 scsi_log_completion(scmd, TIMEOUT_ERROR);
279 if (host->eh_deadline != -1 && !host->last_reset)
280 host->last_reset = jiffies;
282 if (host->transportt->eh_timed_out)
283 rtn = host->transportt->eh_timed_out(scmd);
284 else if (host->hostt->eh_timed_out)
285 rtn = host->hostt->eh_timed_out(scmd);
287 if (rtn == BLK_EH_NOT_HANDLED) {
288 if (!host->hostt->no_async_abort &&
289 scsi_abort_command(scmd) == SUCCESS)
290 return BLK_EH_NOT_HANDLED;
292 set_host_byte(scmd, DID_TIME_OUT);
293 if (!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))
294 rtn = BLK_EH_HANDLED;
301 * scsi_block_when_processing_errors - Prevent cmds from being queued.
302 * @sdev: Device on which we are performing recovery.
305 * We block until the host is out of error recovery, and then check to
306 * see whether the host or the device is offline.
309 * 0 when dev was taken offline by error recovery. 1 OK to proceed.
311 int scsi_block_when_processing_errors(struct scsi_device *sdev)
315 wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host));
317 online = scsi_device_online(sdev);
319 SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev,
320 "%s: rtn: %d\n", __func__, online));
324 EXPORT_SYMBOL(scsi_block_when_processing_errors);
326 #ifdef CONFIG_SCSI_LOGGING
328 * scsi_eh_prt_fail_stats - Log info on failures.
329 * @shost: scsi host being recovered.
330 * @work_q: Queue of scsi cmds to process.
332 static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost,
333 struct list_head *work_q)
335 struct scsi_cmnd *scmd;
336 struct scsi_device *sdev;
337 int total_failures = 0;
340 int devices_failed = 0;
342 shost_for_each_device(sdev, shost) {
343 list_for_each_entry(scmd, work_q, eh_entry) {
344 if (scmd->device == sdev) {
346 if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD)
353 if (cmd_cancel || cmd_failed) {
354 SCSI_LOG_ERROR_RECOVERY(3,
355 shost_printk(KERN_INFO, shost,
356 "%s: cmds failed: %d, cancel: %d\n",
357 __func__, cmd_failed,
365 SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost,
366 "Total of %d commands on %d"
367 " devices require eh work\n",
368 total_failures, devices_failed));
373 * scsi_report_lun_change - Set flag on all *other* devices on the same target
374 * to indicate that a UNIT ATTENTION is expected.
375 * @sdev: Device reporting the UNIT ATTENTION
377 static void scsi_report_lun_change(struct scsi_device *sdev)
379 sdev->sdev_target->expecting_lun_change = 1;
383 * scsi_report_sense - Examine scsi sense information and log messages for
384 * certain conditions, also issue uevents for some of them.
385 * @sdev: Device reporting the sense code
386 * @sshdr: sshdr to be examined
388 static void scsi_report_sense(struct scsi_device *sdev,
389 struct scsi_sense_hdr *sshdr)
391 enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */
393 if (sshdr->sense_key == UNIT_ATTENTION) {
394 if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) {
395 evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED;
396 sdev_printk(KERN_WARNING, sdev,
397 "Inquiry data has changed");
398 } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) {
399 evt_type = SDEV_EVT_LUN_CHANGE_REPORTED;
400 scsi_report_lun_change(sdev);
401 sdev_printk(KERN_WARNING, sdev,
402 "Warning! Received an indication that the "
403 "LUN assignments on this target have "
404 "changed. The Linux SCSI layer does not "
405 "automatically remap LUN assignments.\n");
406 } else if (sshdr->asc == 0x3f)
407 sdev_printk(KERN_WARNING, sdev,
408 "Warning! Received an indication that the "
409 "operating parameters on this target have "
410 "changed. The Linux SCSI layer does not "
411 "automatically adjust these parameters.\n");
413 if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) {
414 evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED;
415 sdev_printk(KERN_WARNING, sdev,
416 "Warning! Received an indication that the "
417 "LUN reached a thin provisioning soft "
421 if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) {
422 evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED;
423 sdev_printk(KERN_WARNING, sdev,
424 "Mode parameters changed");
425 } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) {
426 evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED;
427 sdev_printk(KERN_WARNING, sdev,
428 "Asymmetric access state changed");
429 } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) {
430 evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED;
431 sdev_printk(KERN_WARNING, sdev,
432 "Capacity data has changed");
433 } else if (sshdr->asc == 0x2a)
434 sdev_printk(KERN_WARNING, sdev,
435 "Parameters changed");
438 if (evt_type != SDEV_EVT_MAXBITS) {
439 set_bit(evt_type, sdev->pending_events);
440 schedule_work(&sdev->event_work);
445 * scsi_check_sense - Examine scsi cmd sense
446 * @scmd: Cmd to have sense checked.
449 * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE
452 * When a deferred error is detected the current command has
453 * not been executed and needs retrying.
455 static int scsi_check_sense(struct scsi_cmnd *scmd)
457 struct scsi_device *sdev = scmd->device;
458 struct scsi_sense_hdr sshdr;
460 if (! scsi_command_normalize_sense(scmd, &sshdr))
461 return FAILED; /* no valid sense data */
463 scsi_report_sense(sdev, &sshdr);
465 if (scsi_sense_is_deferred(&sshdr))
468 if (sdev->handler && sdev->handler->check_sense) {
471 rc = sdev->handler->check_sense(sdev, &sshdr);
472 if (rc != SCSI_RETURN_NOT_HANDLED)
474 /* handler does not care. Drop down to default handling */
477 if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done)
479 * nasty: for mid-layer issued TURs, we need to return the
480 * actual sense data without any recovery attempt. For eh
481 * issued ones, we need to try to recover and interpret
486 * Previous logic looked for FILEMARK, EOM or ILI which are
487 * mainly associated with tapes and returned SUCCESS.
489 if (sshdr.response_code == 0x70) {
491 if (scmd->sense_buffer[2] & 0xe0)
495 * descriptor format: look for "stream commands sense data
496 * descriptor" (see SSC-3). Assume single sense data
497 * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG.
499 if ((sshdr.additional_length > 3) &&
500 (scmd->sense_buffer[8] == 0x4) &&
501 (scmd->sense_buffer[11] & 0xe0))
505 switch (sshdr.sense_key) {
508 case RECOVERED_ERROR:
509 return /* soft_error */ SUCCESS;
511 case ABORTED_COMMAND:
512 if (sshdr.asc == 0x10) /* DIF */
519 * if we are expecting a cc/ua because of a bus reset that we
520 * performed, treat this just as a retry. otherwise this is
521 * information that we should pass up to the upper-level driver
522 * so that we can deal with it there.
524 if (scmd->device->expecting_cc_ua) {
526 * Because some device does not queue unit
527 * attentions correctly, we carefully check
528 * additional sense code and qualifier so as
529 * not to squash media change unit attention.
531 if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) {
532 scmd->device->expecting_cc_ua = 0;
537 * we might also expect a cc/ua if another LUN on the target
538 * reported a UA with an ASC/ASCQ of 3F 0E -
539 * REPORTED LUNS DATA HAS CHANGED.
541 if (scmd->device->sdev_target->expecting_lun_change &&
542 sshdr.asc == 0x3f && sshdr.ascq == 0x0e)
545 * if the device is in the process of becoming ready, we
548 if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01))
551 * if the device is not started, we need to wake
552 * the error handler to start the motor
554 if (scmd->device->allow_restart &&
555 (sshdr.asc == 0x04) && (sshdr.ascq == 0x02))
558 * Pass the UA upwards for a determination in the completion
563 /* these are not supported */
565 if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) {
566 /* Thin provisioning hard threshold reached */
567 set_host_byte(scmd, DID_ALLOC_FAILURE);
571 case VOLUME_OVERFLOW:
574 set_host_byte(scmd, DID_TARGET_FAILURE);
578 if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */
579 sshdr.asc == 0x13 || /* AMNF DATA FIELD */
580 sshdr.asc == 0x14) { /* RECORD NOT FOUND */
581 set_host_byte(scmd, DID_MEDIUM_ERROR);
587 if (scmd->device->retry_hwerror)
588 return ADD_TO_MLQUEUE;
590 set_host_byte(scmd, DID_TARGET_FAILURE);
592 case ILLEGAL_REQUEST:
593 if (sshdr.asc == 0x20 || /* Invalid command operation code */
594 sshdr.asc == 0x21 || /* Logical block address out of range */
595 sshdr.asc == 0x24 || /* Invalid field in cdb */
596 sshdr.asc == 0x26) { /* Parameter value invalid */
597 set_host_byte(scmd, DID_TARGET_FAILURE);
606 static void scsi_handle_queue_ramp_up(struct scsi_device *sdev)
608 struct scsi_host_template *sht = sdev->host->hostt;
609 struct scsi_device *tmp_sdev;
611 if (!sht->track_queue_depth ||
612 sdev->queue_depth >= sdev->max_queue_depth)
615 if (time_before(jiffies,
616 sdev->last_queue_ramp_up + sdev->queue_ramp_up_period))
619 if (time_before(jiffies,
620 sdev->last_queue_full_time + sdev->queue_ramp_up_period))
624 * Walk all devices of a target and do
627 shost_for_each_device(tmp_sdev, sdev->host) {
628 if (tmp_sdev->channel != sdev->channel ||
629 tmp_sdev->id != sdev->id ||
630 tmp_sdev->queue_depth == sdev->max_queue_depth)
633 scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1);
634 sdev->last_queue_ramp_up = jiffies;
638 static void scsi_handle_queue_full(struct scsi_device *sdev)
640 struct scsi_host_template *sht = sdev->host->hostt;
641 struct scsi_device *tmp_sdev;
643 if (!sht->track_queue_depth)
646 shost_for_each_device(tmp_sdev, sdev->host) {
647 if (tmp_sdev->channel != sdev->channel ||
648 tmp_sdev->id != sdev->id)
651 * We do not know the number of commands that were at
652 * the device when we got the queue full so we start
653 * from the highest possible value and work our way down.
655 scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1);
660 * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD.
661 * @scmd: SCSI cmd to examine.
664 * This is *only* called when we are examining the status of commands
665 * queued during error recovery. the main difference here is that we
666 * don't allow for the possibility of retries here, and we are a lot
667 * more restrictive about what we consider acceptable.
669 static int scsi_eh_completed_normally(struct scsi_cmnd *scmd)
672 * first check the host byte, to see if there is anything in there
673 * that would indicate what we need to do.
675 if (host_byte(scmd->result) == DID_RESET) {
677 * rats. we are already in the error handler, so we now
678 * get to try and figure out what to do next. if the sense
679 * is valid, we have a pretty good idea of what to do.
680 * if not, we mark it as FAILED.
682 return scsi_check_sense(scmd);
684 if (host_byte(scmd->result) != DID_OK)
688 * next, check the message byte.
690 if (msg_byte(scmd->result) != COMMAND_COMPLETE)
694 * now, check the status byte to see if this indicates
697 switch (status_byte(scmd->result)) {
699 scsi_handle_queue_ramp_up(scmd->device);
700 case COMMAND_TERMINATED:
702 case CHECK_CONDITION:
703 return scsi_check_sense(scmd);
705 case INTERMEDIATE_GOOD:
706 case INTERMEDIATE_C_GOOD:
708 * who knows? FIXME(eric)
711 case RESERVATION_CONFLICT:
712 if (scmd->cmnd[0] == TEST_UNIT_READY)
713 /* it is a success, we probed the device and
716 /* otherwise, we failed to send the command */
719 scsi_handle_queue_full(scmd->device);
730 * scsi_eh_done - Completion function for error handling.
731 * @scmd: Cmd that is done.
733 static void scsi_eh_done(struct scsi_cmnd *scmd)
735 struct completion *eh_action;
737 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
738 "%s result: %x\n", __func__, scmd->result));
740 eh_action = scmd->device->host->eh_action;
746 * scsi_try_host_reset - ask host adapter to reset itself
747 * @scmd: SCSI cmd to send host reset.
749 static int scsi_try_host_reset(struct scsi_cmnd *scmd)
753 struct Scsi_Host *host = scmd->device->host;
754 struct scsi_host_template *hostt = host->hostt;
756 SCSI_LOG_ERROR_RECOVERY(3,
757 shost_printk(KERN_INFO, host, "Snd Host RST\n"));
759 if (!hostt->eh_host_reset_handler)
762 rtn = hostt->eh_host_reset_handler(scmd);
764 if (rtn == SUCCESS) {
765 if (!hostt->skip_settle_delay)
766 ssleep(HOST_RESET_SETTLE_TIME);
767 spin_lock_irqsave(host->host_lock, flags);
768 scsi_report_bus_reset(host, scmd_channel(scmd));
769 spin_unlock_irqrestore(host->host_lock, flags);
776 * scsi_try_bus_reset - ask host to perform a bus reset
777 * @scmd: SCSI cmd to send bus reset.
779 static int scsi_try_bus_reset(struct scsi_cmnd *scmd)
783 struct Scsi_Host *host = scmd->device->host;
784 struct scsi_host_template *hostt = host->hostt;
786 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
787 "%s: Snd Bus RST\n", __func__));
789 if (!hostt->eh_bus_reset_handler)
792 rtn = hostt->eh_bus_reset_handler(scmd);
794 if (rtn == SUCCESS) {
795 if (!hostt->skip_settle_delay)
796 ssleep(BUS_RESET_SETTLE_TIME);
797 spin_lock_irqsave(host->host_lock, flags);
798 scsi_report_bus_reset(host, scmd_channel(scmd));
799 spin_unlock_irqrestore(host->host_lock, flags);
805 static void __scsi_report_device_reset(struct scsi_device *sdev, void *data)
808 sdev->expecting_cc_ua = 1;
812 * scsi_try_target_reset - Ask host to perform a target reset
813 * @scmd: SCSI cmd used to send a target reset
816 * There is no timeout for this operation. if this operation is
817 * unreliable for a given host, then the host itself needs to put a
818 * timer on it, and set the host back to a consistent state prior to
821 static int scsi_try_target_reset(struct scsi_cmnd *scmd)
825 struct Scsi_Host *host = scmd->device->host;
826 struct scsi_host_template *hostt = host->hostt;
828 if (!hostt->eh_target_reset_handler)
831 rtn = hostt->eh_target_reset_handler(scmd);
832 if (rtn == SUCCESS) {
833 spin_lock_irqsave(host->host_lock, flags);
834 __starget_for_each_device(scsi_target(scmd->device), NULL,
835 __scsi_report_device_reset);
836 spin_unlock_irqrestore(host->host_lock, flags);
843 * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
844 * @scmd: SCSI cmd used to send BDR
847 * There is no timeout for this operation. if this operation is
848 * unreliable for a given host, then the host itself needs to put a
849 * timer on it, and set the host back to a consistent state prior to
852 static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
855 struct scsi_host_template *hostt = scmd->device->host->hostt;
857 if (!hostt->eh_device_reset_handler)
860 rtn = hostt->eh_device_reset_handler(scmd);
862 __scsi_report_device_reset(scmd->device, NULL);
867 * scsi_try_to_abort_cmd - Ask host to abort a SCSI command
868 * @hostt: SCSI driver host template
869 * @scmd: SCSI cmd used to send a target reset
872 * SUCCESS, FAILED, or FAST_IO_FAIL
875 * SUCCESS does not necessarily indicate that the command
876 * has been aborted; it only indicates that the LLDDs
877 * has cleared all references to that command.
878 * LLDDs should return FAILED only if an abort was required
879 * but could not be executed. LLDDs should return FAST_IO_FAIL
880 * if the device is temporarily unavailable (eg due to a
881 * link down on FibreChannel)
883 static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt,
884 struct scsi_cmnd *scmd)
886 if (!hostt->eh_abort_handler)
889 return hostt->eh_abort_handler(scmd);
892 static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd)
894 if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS)
895 if (scsi_try_bus_device_reset(scmd) != SUCCESS)
896 if (scsi_try_target_reset(scmd) != SUCCESS)
897 if (scsi_try_bus_reset(scmd) != SUCCESS)
898 scsi_try_host_reset(scmd);
902 * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery
903 * @scmd: SCSI command structure to hijack
904 * @ses: structure to save restore information
905 * @cmnd: CDB to send. Can be NULL if no new cmnd is needed
906 * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB)
907 * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
909 * This function is used to save a scsi command information before re-execution
910 * as part of the error recovery process. If @sense_bytes is 0 the command
911 * sent must be one that does not transfer any data. If @sense_bytes != 0
912 * @cmnd is ignored and this functions sets up a REQUEST_SENSE command
913 * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer.
915 void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
916 unsigned char *cmnd, int cmnd_size, unsigned sense_bytes)
918 struct scsi_device *sdev = scmd->device;
921 * We need saved copies of a number of fields - this is because
922 * error handling may need to overwrite these with different values
923 * to run different commands, and once error handling is complete,
924 * we will need to restore these values prior to running the actual
927 ses->cmd_len = scmd->cmd_len;
928 ses->cmnd = scmd->cmnd;
929 ses->data_direction = scmd->sc_data_direction;
930 ses->sdb = scmd->sdb;
931 ses->next_rq = scmd->request->next_rq;
932 ses->result = scmd->result;
933 ses->underflow = scmd->underflow;
934 ses->prot_op = scmd->prot_op;
936 scmd->prot_op = SCSI_PROT_NORMAL;
938 scmd->cmnd = ses->eh_cmnd;
939 memset(scmd->cmnd, 0, BLK_MAX_CDB);
940 memset(&scmd->sdb, 0, sizeof(scmd->sdb));
941 scmd->request->next_rq = NULL;
945 scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE,
947 sg_init_one(&ses->sense_sgl, scmd->sense_buffer,
949 scmd->sdb.table.sgl = &ses->sense_sgl;
950 scmd->sc_data_direction = DMA_FROM_DEVICE;
951 scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1;
952 scmd->cmnd[0] = REQUEST_SENSE;
953 scmd->cmnd[4] = scmd->sdb.length;
954 scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
956 scmd->sc_data_direction = DMA_NONE;
958 BUG_ON(cmnd_size > BLK_MAX_CDB);
959 memcpy(scmd->cmnd, cmnd, cmnd_size);
960 scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
966 if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN)
967 scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
968 (sdev->lun << 5 & 0xe0);
971 * Zero the sense buffer. The scsi spec mandates that any
972 * untransferred sense data should be interpreted as being zero.
974 memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
976 EXPORT_SYMBOL(scsi_eh_prep_cmnd);
979 * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery
980 * @scmd: SCSI command structure to restore
981 * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd
983 * Undo any damage done by above scsi_eh_prep_cmnd().
985 void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
988 * Restore original data
990 scmd->cmd_len = ses->cmd_len;
991 scmd->cmnd = ses->cmnd;
992 scmd->sc_data_direction = ses->data_direction;
993 scmd->sdb = ses->sdb;
994 scmd->request->next_rq = ses->next_rq;
995 scmd->result = ses->result;
996 scmd->underflow = ses->underflow;
997 scmd->prot_op = ses->prot_op;
999 EXPORT_SYMBOL(scsi_eh_restore_cmnd);
1002 * scsi_send_eh_cmnd - submit a scsi command as part of error recovery
1003 * @scmd: SCSI command structure to hijack
1004 * @cmnd: CDB to send
1005 * @cmnd_size: size in bytes of @cmnd
1006 * @timeout: timeout for this request
1007 * @sense_bytes: size of sense data to copy or 0
1009 * This function is used to send a scsi command down to a target device
1010 * as part of the error recovery process. See also scsi_eh_prep_cmnd() above.
1013 * SUCCESS or FAILED or NEEDS_RETRY
1015 static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
1016 int cmnd_size, int timeout, unsigned sense_bytes)
1018 struct scsi_device *sdev = scmd->device;
1019 struct Scsi_Host *shost = sdev->host;
1020 DECLARE_COMPLETION_ONSTACK(done);
1021 unsigned long timeleft = timeout;
1022 struct scsi_eh_save ses;
1023 const unsigned long stall_for = msecs_to_jiffies(100);
1027 scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes);
1028 shost->eh_action = &done;
1030 scsi_log_send(scmd);
1031 scmd->scsi_done = scsi_eh_done;
1032 rtn = shost->hostt->queuecommand(shost, scmd);
1034 if (timeleft > stall_for) {
1035 scsi_eh_restore_cmnd(scmd, &ses);
1036 timeleft -= stall_for;
1037 msleep(jiffies_to_msecs(stall_for));
1040 /* signal not to enter either branch of the if () below */
1044 timeleft = wait_for_completion_timeout(&done, timeout);
1048 shost->eh_action = NULL;
1050 scsi_log_completion(scmd, rtn);
1052 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
1053 "%s timeleft: %ld\n",
1054 __func__, timeleft));
1057 * If there is time left scsi_eh_done got called, and we will examine
1058 * the actual status codes to see whether the command actually did
1059 * complete normally, else if we have a zero return and no time left,
1060 * the command must still be pending, so abort it and return FAILED.
1061 * If we never actually managed to issue the command, because
1062 * ->queuecommand() kept returning non zero, use the rtn = FAILED
1063 * value above (so don't execute either branch of the if)
1066 rtn = scsi_eh_completed_normally(scmd);
1067 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
1068 "%s: scsi_eh_completed_normally %x\n", __func__, rtn));
1075 case ADD_TO_MLQUEUE:
1082 } else if (rtn != FAILED) {
1083 scsi_abort_eh_cmnd(scmd);
1087 scsi_eh_restore_cmnd(scmd, &ses);
1093 * scsi_request_sense - Request sense data from a particular target.
1094 * @scmd: SCSI cmd for request sense.
1097 * Some hosts automatically obtain this information, others require
1098 * that we obtain it on our own. This function will *not* return until
1099 * the command either times out, or it completes.
1101 static int scsi_request_sense(struct scsi_cmnd *scmd)
1103 return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0);
1106 static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn)
1108 if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) {
1109 struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd);
1110 if (sdrv->eh_action)
1111 rtn = sdrv->eh_action(scmd, rtn);
1117 * scsi_eh_finish_cmd - Handle a cmd that eh is finished with.
1118 * @scmd: Original SCSI cmd that eh has finished.
1119 * @done_q: Queue for processed commands.
1122 * We don't want to use the normal command completion while we are are
1123 * still handling errors - it may cause other commands to be queued,
1124 * and that would disturb what we are doing. Thus we really want to
1125 * keep a list of pending commands for final completion, and once we
1126 * are ready to leave error handling we handle completion for real.
1128 void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q)
1130 scmd->device->host->host_failed--;
1131 scmd->eh_eflags = 0;
1132 list_move_tail(&scmd->eh_entry, done_q);
1134 EXPORT_SYMBOL(scsi_eh_finish_cmd);
1137 * scsi_eh_get_sense - Get device sense data.
1138 * @work_q: Queue of commands to process.
1139 * @done_q: Queue of processed commands.
1142 * See if we need to request sense information. if so, then get it
1143 * now, so we have a better idea of what to do.
1146 * This has the unfortunate side effect that if a shost adapter does
1147 * not automatically request sense information, we end up shutting
1148 * it down before we request it.
1150 * All drivers should request sense information internally these days,
1151 * so for now all I have to say is tough noogies if you end up in here.
1153 * XXX: Long term this code should go away, but that needs an audit of
1156 int scsi_eh_get_sense(struct list_head *work_q,
1157 struct list_head *done_q)
1159 struct scsi_cmnd *scmd, *next;
1160 struct Scsi_Host *shost;
1164 * If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO,
1165 * should not get sense.
1167 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
1168 if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) ||
1169 (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) ||
1170 SCSI_SENSE_VALID(scmd))
1173 shost = scmd->device->host;
1174 if (scsi_host_eh_past_deadline(shost)) {
1175 SCSI_LOG_ERROR_RECOVERY(3,
1176 scmd_printk(KERN_INFO, scmd,
1177 "%s: skip request sense, past eh deadline\n",
1181 if (status_byte(scmd->result) != CHECK_CONDITION)
1183 * don't request sense if there's no check condition
1184 * status because the error we're processing isn't one
1185 * that has a sense code (and some devices get
1186 * confused by sense requests out of the blue)
1190 SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd,
1191 "%s: requesting sense\n",
1193 rtn = scsi_request_sense(scmd);
1197 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
1198 "sense requested, result %x\n", scmd->result));
1199 SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd));
1201 rtn = scsi_decide_disposition(scmd);
1204 * if the result was normal, then just pass it along to the
1208 /* we don't want this command reissued, just
1209 * finished with the sense data, so set
1210 * retries to the max allowed to ensure it
1211 * won't get reissued */
1212 scmd->retries = scmd->allowed;
1213 else if (rtn != NEEDS_RETRY)
1216 scsi_eh_finish_cmd(scmd, done_q);
1219 return list_empty(work_q);
1221 EXPORT_SYMBOL_GPL(scsi_eh_get_sense);
1224 * scsi_eh_tur - Send TUR to device.
1225 * @scmd: &scsi_cmnd to send TUR
1228 * 0 - Device is ready. 1 - Device NOT ready.
1230 static int scsi_eh_tur(struct scsi_cmnd *scmd)
1232 static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0};
1233 int retry_cnt = 1, rtn;
1236 rtn = scsi_send_eh_cmnd(scmd, tur_command, 6,
1237 scmd->device->eh_timeout, 0);
1239 SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
1240 "%s return: %x\n", __func__, rtn));
1255 * scsi_eh_test_devices - check if devices are responding from error recovery.
1256 * @cmd_list: scsi commands in error recovery.
1257 * @work_q: queue for commands which still need more error recovery
1258 * @done_q: queue for commands which are finished
1259 * @try_stu: boolean on if a STU command should be tried in addition to TUR.
1262 * Tests if devices are in a working state. Commands to devices now in
1263 * a working state are sent to the done_q while commands to devices which
1264 * are still failing to respond are returned to the work_q for more
1267 static int scsi_eh_test_devices(struct list_head *cmd_list,
1268 struct list_head *work_q,
1269 struct list_head *done_q, int try_stu)
1271 struct scsi_cmnd *scmd, *next;
1272 struct scsi_device *sdev;
1275 while (!list_empty(cmd_list)) {
1276 scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry);
1277 sdev = scmd->device;
1280 if (scsi_host_eh_past_deadline(sdev->host)) {
1281 /* Push items back onto work_q */
1282 list_splice_init(cmd_list, work_q);
1283 SCSI_LOG_ERROR_RECOVERY(3,
1284 sdev_printk(KERN_INFO, sdev,
1285 "%s: skip test device, past eh deadline",
1291 finish_cmds = !scsi_device_online(scmd->device) ||
1292 (try_stu && !scsi_eh_try_stu(scmd) &&
1293 !scsi_eh_tur(scmd)) ||
1296 list_for_each_entry_safe(scmd, next, cmd_list, eh_entry)
1297 if (scmd->device == sdev) {
1300 scsi_eh_action(scmd, SUCCESS) == SUCCESS))
1301 scsi_eh_finish_cmd(scmd, done_q);
1303 list_move_tail(&scmd->eh_entry, work_q);
1306 return list_empty(work_q);
1311 * scsi_eh_abort_cmds - abort pending commands.
1312 * @work_q: &list_head for pending commands.
1313 * @done_q: &list_head for processed commands.
1316 * Try and see whether or not it makes sense to try and abort the
1317 * running command. This only works out to be the case if we have one
1318 * command that has timed out. If the command simply failed, it makes
1319 * no sense to try and abort the command, since as far as the shost
1320 * adapter is concerned, it isn't running.
1322 static int scsi_eh_abort_cmds(struct list_head *work_q,
1323 struct list_head *done_q)
1325 struct scsi_cmnd *scmd, *next;
1326 LIST_HEAD(check_list);
1328 struct Scsi_Host *shost;
1330 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
1331 if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD))
1333 shost = scmd->device->host;
1334 if (scsi_host_eh_past_deadline(shost)) {
1335 list_splice_init(&check_list, work_q);
1336 SCSI_LOG_ERROR_RECOVERY(3,
1337 scmd_printk(KERN_INFO, scmd,
1338 "%s: skip aborting cmd, past eh deadline\n",
1340 return list_empty(work_q);
1342 SCSI_LOG_ERROR_RECOVERY(3,
1343 scmd_printk(KERN_INFO, scmd,
1344 "%s: aborting cmd\n", current->comm));
1345 rtn = scsi_try_to_abort_cmd(shost->hostt, scmd);
1346 if (rtn == FAILED) {
1347 SCSI_LOG_ERROR_RECOVERY(3,
1348 scmd_printk(KERN_INFO, scmd,
1349 "%s: aborting cmd failed\n",
1351 list_splice_init(&check_list, work_q);
1352 return list_empty(work_q);
1354 scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD;
1355 if (rtn == FAST_IO_FAIL)
1356 scsi_eh_finish_cmd(scmd, done_q);
1358 list_move_tail(&scmd->eh_entry, &check_list);
1361 return scsi_eh_test_devices(&check_list, work_q, done_q, 0);
1365 * scsi_eh_try_stu - Send START_UNIT to device.
1366 * @scmd: &scsi_cmnd to send START_UNIT
1369 * 0 - Device is ready. 1 - Device NOT ready.
1371 static int scsi_eh_try_stu(struct scsi_cmnd *scmd)
1373 static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0};
1375 if (scmd->device->allow_restart) {
1376 int i, rtn = NEEDS_RETRY;
1378 for (i = 0; rtn == NEEDS_RETRY && i < 2; i++)
1379 rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0);
1389 * scsi_eh_stu - send START_UNIT if needed
1390 * @shost: &scsi host being recovered.
1391 * @work_q: &list_head for pending commands.
1392 * @done_q: &list_head for processed commands.
1395 * If commands are failing due to not ready, initializing command required,
1396 * try revalidating the device, which will end up sending a start unit.
1398 static int scsi_eh_stu(struct Scsi_Host *shost,
1399 struct list_head *work_q,
1400 struct list_head *done_q)
1402 struct scsi_cmnd *scmd, *stu_scmd, *next;
1403 struct scsi_device *sdev;
1405 shost_for_each_device(sdev, shost) {
1406 if (scsi_host_eh_past_deadline(shost)) {
1407 SCSI_LOG_ERROR_RECOVERY(3,
1408 sdev_printk(KERN_INFO, sdev,
1409 "%s: skip START_UNIT, past eh deadline\n",
1414 list_for_each_entry(scmd, work_q, eh_entry)
1415 if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) &&
1416 scsi_check_sense(scmd) == FAILED ) {
1424 SCSI_LOG_ERROR_RECOVERY(3,
1425 sdev_printk(KERN_INFO, sdev,
1426 "%s: Sending START_UNIT\n",
1429 if (!scsi_eh_try_stu(stu_scmd)) {
1430 if (!scsi_device_online(sdev) ||
1431 !scsi_eh_tur(stu_scmd)) {
1432 list_for_each_entry_safe(scmd, next,
1434 if (scmd->device == sdev &&
1435 scsi_eh_action(scmd, SUCCESS) == SUCCESS)
1436 scsi_eh_finish_cmd(scmd, done_q);
1440 SCSI_LOG_ERROR_RECOVERY(3,
1441 sdev_printk(KERN_INFO, sdev,
1442 "%s: START_UNIT failed\n",
1447 return list_empty(work_q);
1452 * scsi_eh_bus_device_reset - send bdr if needed
1453 * @shost: scsi host being recovered.
1454 * @work_q: &list_head for pending commands.
1455 * @done_q: &list_head for processed commands.
1458 * Try a bus device reset. Still, look to see whether we have multiple
1459 * devices that are jammed or not - if we have multiple devices, it
1460 * makes no sense to try bus_device_reset - we really would need to try
1461 * a bus_reset instead.
1463 static int scsi_eh_bus_device_reset(struct Scsi_Host *shost,
1464 struct list_head *work_q,
1465 struct list_head *done_q)
1467 struct scsi_cmnd *scmd, *bdr_scmd, *next;
1468 struct scsi_device *sdev;
1471 shost_for_each_device(sdev, shost) {
1472 if (scsi_host_eh_past_deadline(shost)) {
1473 SCSI_LOG_ERROR_RECOVERY(3,
1474 sdev_printk(KERN_INFO, sdev,
1475 "%s: skip BDR, past eh deadline\n",
1480 list_for_each_entry(scmd, work_q, eh_entry)
1481 if (scmd->device == sdev) {
1489 SCSI_LOG_ERROR_RECOVERY(3,
1490 sdev_printk(KERN_INFO, sdev,
1491 "%s: Sending BDR\n", current->comm));
1492 rtn = scsi_try_bus_device_reset(bdr_scmd);
1493 if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
1494 if (!scsi_device_online(sdev) ||
1495 rtn == FAST_IO_FAIL ||
1496 !scsi_eh_tur(bdr_scmd)) {
1497 list_for_each_entry_safe(scmd, next,
1499 if (scmd->device == sdev &&
1500 scsi_eh_action(scmd, rtn) != FAILED)
1501 scsi_eh_finish_cmd(scmd,
1506 SCSI_LOG_ERROR_RECOVERY(3,
1507 sdev_printk(KERN_INFO, sdev,
1508 "%s: BDR failed\n", current->comm));
1512 return list_empty(work_q);
1516 * scsi_eh_target_reset - send target reset if needed
1517 * @shost: scsi host being recovered.
1518 * @work_q: &list_head for pending commands.
1519 * @done_q: &list_head for processed commands.
1522 * Try a target reset.
1524 static int scsi_eh_target_reset(struct Scsi_Host *shost,
1525 struct list_head *work_q,
1526 struct list_head *done_q)
1528 LIST_HEAD(tmp_list);
1529 LIST_HEAD(check_list);
1531 list_splice_init(work_q, &tmp_list);
1533 while (!list_empty(&tmp_list)) {
1534 struct scsi_cmnd *next, *scmd;
1538 if (scsi_host_eh_past_deadline(shost)) {
1539 /* push back on work queue for further processing */
1540 list_splice_init(&check_list, work_q);
1541 list_splice_init(&tmp_list, work_q);
1542 SCSI_LOG_ERROR_RECOVERY(3,
1543 shost_printk(KERN_INFO, shost,
1544 "%s: Skip target reset, past eh deadline\n",
1546 return list_empty(work_q);
1549 scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry);
1552 SCSI_LOG_ERROR_RECOVERY(3,
1553 shost_printk(KERN_INFO, shost,
1554 "%s: Sending target reset to target %d\n",
1555 current->comm, id));
1556 rtn = scsi_try_target_reset(scmd);
1557 if (rtn != SUCCESS && rtn != FAST_IO_FAIL)
1558 SCSI_LOG_ERROR_RECOVERY(3,
1559 shost_printk(KERN_INFO, shost,
1560 "%s: Target reset failed"
1562 current->comm, id));
1563 list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) {
1564 if (scmd_id(scmd) != id)
1568 list_move_tail(&scmd->eh_entry, &check_list);
1569 else if (rtn == FAST_IO_FAIL)
1570 scsi_eh_finish_cmd(scmd, done_q);
1572 /* push back on work queue for further processing */
1573 list_move(&scmd->eh_entry, work_q);
1577 return scsi_eh_test_devices(&check_list, work_q, done_q, 0);
1581 * scsi_eh_bus_reset - send a bus reset
1582 * @shost: &scsi host being recovered.
1583 * @work_q: &list_head for pending commands.
1584 * @done_q: &list_head for processed commands.
1586 static int scsi_eh_bus_reset(struct Scsi_Host *shost,
1587 struct list_head *work_q,
1588 struct list_head *done_q)
1590 struct scsi_cmnd *scmd, *chan_scmd, *next;
1591 LIST_HEAD(check_list);
1592 unsigned int channel;
1596 * we really want to loop over the various channels, and do this on
1597 * a channel by channel basis. we should also check to see if any
1598 * of the failed commands are on soft_reset devices, and if so, skip
1602 for (channel = 0; channel <= shost->max_channel; channel++) {
1603 if (scsi_host_eh_past_deadline(shost)) {
1604 list_splice_init(&check_list, work_q);
1605 SCSI_LOG_ERROR_RECOVERY(3,
1606 shost_printk(KERN_INFO, shost,
1607 "%s: skip BRST, past eh deadline\n",
1609 return list_empty(work_q);
1613 list_for_each_entry(scmd, work_q, eh_entry) {
1614 if (channel == scmd_channel(scmd)) {
1618 * FIXME add back in some support for
1619 * soft_reset devices.
1626 SCSI_LOG_ERROR_RECOVERY(3,
1627 shost_printk(KERN_INFO, shost,
1628 "%s: Sending BRST chan: %d\n",
1629 current->comm, channel));
1630 rtn = scsi_try_bus_reset(chan_scmd);
1631 if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
1632 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
1633 if (channel == scmd_channel(scmd)) {
1634 if (rtn == FAST_IO_FAIL)
1635 scsi_eh_finish_cmd(scmd,
1638 list_move_tail(&scmd->eh_entry,
1643 SCSI_LOG_ERROR_RECOVERY(3,
1644 shost_printk(KERN_INFO, shost,
1645 "%s: BRST failed chan: %d\n",
1646 current->comm, channel));
1649 return scsi_eh_test_devices(&check_list, work_q, done_q, 0);
1653 * scsi_eh_host_reset - send a host reset
1654 * @shost: host to be reset.
1655 * @work_q: &list_head for pending commands.
1656 * @done_q: &list_head for processed commands.
1658 static int scsi_eh_host_reset(struct Scsi_Host *shost,
1659 struct list_head *work_q,
1660 struct list_head *done_q)
1662 struct scsi_cmnd *scmd, *next;
1663 LIST_HEAD(check_list);
1666 if (!list_empty(work_q)) {
1667 scmd = list_entry(work_q->next,
1668 struct scsi_cmnd, eh_entry);
1670 SCSI_LOG_ERROR_RECOVERY(3,
1671 shost_printk(KERN_INFO, shost,
1672 "%s: Sending HRST\n",
1675 rtn = scsi_try_host_reset(scmd);
1676 if (rtn == SUCCESS) {
1677 list_splice_init(work_q, &check_list);
1678 } else if (rtn == FAST_IO_FAIL) {
1679 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
1680 scsi_eh_finish_cmd(scmd, done_q);
1683 SCSI_LOG_ERROR_RECOVERY(3,
1684 shost_printk(KERN_INFO, shost,
1685 "%s: HRST failed\n",
1689 return scsi_eh_test_devices(&check_list, work_q, done_q, 1);
1693 * scsi_eh_offline_sdevs - offline scsi devices that fail to recover
1694 * @work_q: &list_head for pending commands.
1695 * @done_q: &list_head for processed commands.
1697 static void scsi_eh_offline_sdevs(struct list_head *work_q,
1698 struct list_head *done_q)
1700 struct scsi_cmnd *scmd, *next;
1702 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
1703 sdev_printk(KERN_INFO, scmd->device, "Device offlined - "
1704 "not ready after error recovery\n");
1705 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1706 if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) {
1708 * FIXME: Handle lost cmds.
1711 scsi_eh_finish_cmd(scmd, done_q);
1717 * scsi_noretry_cmd - determine if command should be failed fast
1718 * @scmd: SCSI cmd to examine.
1720 int scsi_noretry_cmd(struct scsi_cmnd *scmd)
1722 switch (host_byte(scmd->result)) {
1728 return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT);
1730 return (scmd->request->cmd_flags & REQ_FAILFAST_DEV);
1732 if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
1733 status_byte(scmd->result) == RESERVATION_CONFLICT)
1736 case DID_SOFT_ERROR:
1737 return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER);
1740 if (status_byte(scmd->result) != CHECK_CONDITION)
1745 * assume caller has checked sense and determined
1746 * the check condition was retryable.
1748 if (scmd->request->cmd_flags & REQ_FAILFAST_DEV ||
1749 scmd->request->cmd_type == REQ_TYPE_BLOCK_PC)
1756 * scsi_decide_disposition - Disposition a cmd on return from LLD.
1757 * @scmd: SCSI cmd to examine.
1760 * This is *only* called when we are examining the status after sending
1761 * out the actual data command. any commands that are queued for error
1762 * recovery (e.g. test_unit_ready) do *not* come through here.
1764 * When this routine returns failed, it means the error handler thread
1765 * is woken. In cases where the error code indicates an error that
1766 * doesn't require the error handler read (i.e. we don't need to
1767 * abort/reset), this function should return SUCCESS.
1769 int scsi_decide_disposition(struct scsi_cmnd *scmd)
1774 * if the device is offline, then we clearly just pass the result back
1775 * up to the top level.
1777 if (!scsi_device_online(scmd->device)) {
1778 SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd,
1779 "%s: device offline - report as SUCCESS\n", __func__));
1784 * first check the host byte, to see if there is anything in there
1785 * that would indicate what we need to do.
1787 switch (host_byte(scmd->result)) {
1788 case DID_PASSTHROUGH:
1790 * no matter what, pass this through to the upper layer.
1791 * nuke this special code so that it looks like we are saying
1794 scmd->result &= 0xff00ffff;
1798 * looks good. drop through, and check the next byte.
1802 if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) {
1803 set_host_byte(scmd, DID_TIME_OUT);
1806 case DID_NO_CONNECT:
1807 case DID_BAD_TARGET:
1809 * note - this means that we just report the status back
1810 * to the top level driver, not that we actually think
1811 * that it indicates SUCCESS.
1815 * when the low level driver returns did_soft_error,
1816 * it is responsible for keeping an internal retry counter
1817 * in order to avoid endless loops (db)
1819 * actually this is a bug in this function here. we should
1820 * be mindful of the maximum number of retries specified
1821 * and not get stuck in a loop.
1823 case DID_SOFT_ERROR:
1829 return ADD_TO_MLQUEUE;
1830 case DID_TRANSPORT_DISRUPTED:
1832 * LLD/transport was disrupted during processing of the IO.
1833 * The transport class is now blocked/blocking,
1834 * and the transport will decide what to do with the IO
1835 * based on its timers and recovery capablilities if
1836 * there are enough retries.
1839 case DID_TRANSPORT_FAILFAST:
1841 * The transport decided to failfast the IO (most likely
1842 * the fast io fail tmo fired), so send IO directly upwards.
1846 if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
1847 status_byte(scmd->result) == RESERVATION_CONFLICT)
1849 * execute reservation conflict processing code
1859 * when we scan the bus, we get timeout messages for
1860 * these commands if there is no device available.
1861 * other hosts report did_no_connect for the same thing.
1863 if ((scmd->cmnd[0] == TEST_UNIT_READY ||
1864 scmd->cmnd[0] == INQUIRY)) {
1876 * next, check the message byte.
1878 if (msg_byte(scmd->result) != COMMAND_COMPLETE)
1882 * check the status byte to see if this indicates anything special.
1884 switch (status_byte(scmd->result)) {
1886 scsi_handle_queue_full(scmd->device);
1888 * the case of trying to send too many commands to a
1889 * tagged queueing device.
1893 * device can't talk to us at the moment. Should only
1894 * occur (SAM-3) when the task queue is empty, so will cause
1895 * the empty queue handling to trigger a stall in the
1898 return ADD_TO_MLQUEUE;
1900 if (scmd->cmnd[0] == REPORT_LUNS)
1901 scmd->device->sdev_target->expecting_lun_change = 0;
1902 scsi_handle_queue_ramp_up(scmd->device);
1903 case COMMAND_TERMINATED:
1907 case CHECK_CONDITION:
1908 rtn = scsi_check_sense(scmd);
1909 if (rtn == NEEDS_RETRY)
1911 /* if rtn == FAILED, we have no sense information;
1912 * returning FAILED will wake the error handler thread
1913 * to collect the sense and redo the decide
1916 case CONDITION_GOOD:
1917 case INTERMEDIATE_GOOD:
1918 case INTERMEDIATE_C_GOOD:
1921 * who knows? FIXME(eric)
1925 case RESERVATION_CONFLICT:
1926 sdev_printk(KERN_INFO, scmd->device,
1927 "reservation conflict\n");
1928 set_host_byte(scmd, DID_NEXUS_FAILURE);
1929 return SUCCESS; /* causes immediate i/o error */
1937 /* we requeue for retry because the error was retryable, and
1938 * the request was not marked fast fail. Note that above,
1939 * even if the request is marked fast fail, we still requeue
1940 * for queue congestion conditions (QUEUE_FULL or BUSY) */
1941 if ((++scmd->retries) <= scmd->allowed
1942 && !scsi_noretry_cmd(scmd)) {
1946 * no more retries - report this one back to upper level.
1952 static void eh_lock_door_done(struct request *req, int uptodate)
1954 __blk_put_request(req->q, req);
1958 * scsi_eh_lock_door - Prevent medium removal for the specified device
1959 * @sdev: SCSI device to prevent medium removal
1962 * We must be called from process context.
1965 * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the
1966 * head of the devices request queue, and continue.
1968 static void scsi_eh_lock_door(struct scsi_device *sdev)
1970 struct request *req;
1973 * blk_get_request with GFP_KERNEL (__GFP_RECLAIM) sleeps until a
1974 * request becomes available
1976 req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL);
1980 blk_rq_set_block_pc(req);
1982 req->cmd[0] = ALLOW_MEDIUM_REMOVAL;
1986 req->cmd[4] = SCSI_REMOVAL_PREVENT;
1989 req->cmd_len = COMMAND_SIZE(req->cmd[0]);
1991 req->cmd_flags |= REQ_QUIET;
1992 req->timeout = 10 * HZ;
1995 blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done);
1999 * scsi_restart_operations - restart io operations to the specified host.
2000 * @shost: Host we are restarting.
2003 * When we entered the error handler, we blocked all further i/o to
2004 * this device. we need to 'reverse' this process.
2006 static void scsi_restart_operations(struct Scsi_Host *shost)
2008 struct scsi_device *sdev;
2009 unsigned long flags;
2012 * If the door was locked, we need to insert a door lock request
2013 * onto the head of the SCSI request queue for the device. There
2014 * is no point trying to lock the door of an off-line device.
2016 shost_for_each_device(sdev, shost) {
2017 if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) {
2018 scsi_eh_lock_door(sdev);
2019 sdev->was_reset = 0;
2024 * next free up anything directly waiting upon the host. this
2025 * will be requests for character device operations, and also for
2026 * ioctls to queued block devices.
2028 SCSI_LOG_ERROR_RECOVERY(3,
2029 shost_printk(KERN_INFO, shost, "waking up host to restart\n"));
2031 spin_lock_irqsave(shost->host_lock, flags);
2032 if (scsi_host_set_state(shost, SHOST_RUNNING))
2033 if (scsi_host_set_state(shost, SHOST_CANCEL))
2034 BUG_ON(scsi_host_set_state(shost, SHOST_DEL));
2035 spin_unlock_irqrestore(shost->host_lock, flags);
2037 wake_up(&shost->host_wait);
2040 * finally we need to re-initiate requests that may be pending. we will
2041 * have had everything blocked while error handling is taking place, and
2042 * now that error recovery is done, we will need to ensure that these
2043 * requests are started.
2045 scsi_run_host_queues(shost);
2048 * if eh is active and host_eh_scheduled is pending we need to re-run
2049 * recovery. we do this check after scsi_run_host_queues() to allow
2050 * everything pent up since the last eh run a chance to make forward
2051 * progress before we sync again. Either we'll immediately re-run
2052 * recovery or scsi_device_unbusy() will wake us again when these
2053 * pending commands complete.
2055 spin_lock_irqsave(shost->host_lock, flags);
2056 if (shost->host_eh_scheduled)
2057 if (scsi_host_set_state(shost, SHOST_RECOVERY))
2058 WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY));
2059 spin_unlock_irqrestore(shost->host_lock, flags);
2063 * scsi_eh_ready_devs - check device ready state and recover if not.
2064 * @shost: host to be recovered.
2065 * @work_q: &list_head for pending commands.
2066 * @done_q: &list_head for processed commands.
2068 void scsi_eh_ready_devs(struct Scsi_Host *shost,
2069 struct list_head *work_q,
2070 struct list_head *done_q)
2072 if (!scsi_eh_stu(shost, work_q, done_q))
2073 if (!scsi_eh_bus_device_reset(shost, work_q, done_q))
2074 if (!scsi_eh_target_reset(shost, work_q, done_q))
2075 if (!scsi_eh_bus_reset(shost, work_q, done_q))
2076 if (!scsi_eh_host_reset(shost, work_q, done_q))
2077 scsi_eh_offline_sdevs(work_q,
2080 EXPORT_SYMBOL_GPL(scsi_eh_ready_devs);
2083 * scsi_eh_flush_done_q - finish processed commands or retry them.
2084 * @done_q: list_head of processed commands.
2086 void scsi_eh_flush_done_q(struct list_head *done_q)
2088 struct scsi_cmnd *scmd, *next;
2090 list_for_each_entry_safe(scmd, next, done_q, eh_entry) {
2091 list_del_init(&scmd->eh_entry);
2092 if (scsi_device_online(scmd->device) &&
2093 !scsi_noretry_cmd(scmd) &&
2094 (++scmd->retries <= scmd->allowed)) {
2095 SCSI_LOG_ERROR_RECOVERY(3,
2096 scmd_printk(KERN_INFO, scmd,
2097 "%s: flush retry cmd\n",
2099 scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY);
2102 * If just we got sense for the device (called
2103 * scsi_eh_get_sense), scmd->result is already
2104 * set, do not set DRIVER_TIMEOUT.
2107 scmd->result |= (DRIVER_TIMEOUT << 24);
2108 SCSI_LOG_ERROR_RECOVERY(3,
2109 scmd_printk(KERN_INFO, scmd,
2110 "%s: flush finish cmd\n",
2112 scsi_finish_command(scmd);
2116 EXPORT_SYMBOL(scsi_eh_flush_done_q);
2119 * scsi_unjam_host - Attempt to fix a host which has a cmd that failed.
2120 * @shost: Host to unjam.
2123 * When we come in here, we *know* that all commands on the bus have
2124 * either completed, failed or timed out. we also know that no further
2125 * commands are being sent to the host, so things are relatively quiet
2126 * and we have freedom to fiddle with things as we wish.
2128 * This is only the *default* implementation. it is possible for
2129 * individual drivers to supply their own version of this function, and
2130 * if the maintainer wishes to do this, it is strongly suggested that
2131 * this function be taken as a template and modified. this function
2132 * was designed to correctly handle problems for about 95% of the
2133 * different cases out there, and it should always provide at least a
2134 * reasonable amount of error recovery.
2136 * Any command marked 'failed' or 'timeout' must eventually have
2137 * scsi_finish_cmd() called for it. we do all of the retry stuff
2138 * here, so when we restart the host after we return it should have an
2141 static void scsi_unjam_host(struct Scsi_Host *shost)
2143 unsigned long flags;
2144 LIST_HEAD(eh_work_q);
2145 LIST_HEAD(eh_done_q);
2147 spin_lock_irqsave(shost->host_lock, flags);
2148 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
2149 spin_unlock_irqrestore(shost->host_lock, flags);
2151 SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q));
2153 if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q))
2154 if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q))
2155 scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q);
2157 spin_lock_irqsave(shost->host_lock, flags);
2158 if (shost->eh_deadline != -1)
2159 shost->last_reset = 0;
2160 spin_unlock_irqrestore(shost->host_lock, flags);
2161 scsi_eh_flush_done_q(&eh_done_q);
2165 * scsi_error_handler - SCSI error handler thread
2166 * @data: Host for which we are running.
2169 * This is the main error handling loop. This is run as a kernel thread
2170 * for every SCSI host and handles all error handling activity.
2172 int scsi_error_handler(void *data)
2174 struct Scsi_Host *shost = data;
2177 * We use TASK_INTERRUPTIBLE so that the thread is not
2178 * counted against the load average as a running process.
2179 * We never actually get interrupted because kthread_run
2180 * disables signal delivery for the created thread.
2184 * The sequence in kthread_stop() sets the stop flag first
2185 * then wakes the process. To avoid missed wakeups, the task
2186 * should always be in a non running state before the stop
2189 set_current_state(TASK_INTERRUPTIBLE);
2190 if (kthread_should_stop())
2193 if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) ||
2194 shost->host_failed != atomic_read(&shost->host_busy)) {
2195 SCSI_LOG_ERROR_RECOVERY(1,
2196 shost_printk(KERN_INFO, shost,
2197 "scsi_eh_%d: sleeping\n",
2203 __set_current_state(TASK_RUNNING);
2204 SCSI_LOG_ERROR_RECOVERY(1,
2205 shost_printk(KERN_INFO, shost,
2206 "scsi_eh_%d: waking up %d/%d/%d\n",
2207 shost->host_no, shost->host_eh_scheduled,
2209 atomic_read(&shost->host_busy)));
2212 * We have a host that is failing for some reason. Figure out
2213 * what we need to do to get it up and online again (if we can).
2214 * If we fail, we end up taking the thing offline.
2216 if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) {
2217 SCSI_LOG_ERROR_RECOVERY(1,
2218 shost_printk(KERN_ERR, shost,
2219 "scsi_eh_%d: unable to autoresume\n",
2224 if (shost->transportt->eh_strategy_handler)
2225 shost->transportt->eh_strategy_handler(shost);
2227 scsi_unjam_host(shost);
2230 * Note - if the above fails completely, the action is to take
2231 * individual devices offline and flush the queue of any
2232 * outstanding requests that may have been pending. When we
2233 * restart, we restart any I/O to any other devices on the bus
2234 * which are still online.
2236 scsi_restart_operations(shost);
2237 if (!shost->eh_noresume)
2238 scsi_autopm_put_host(shost);
2240 __set_current_state(TASK_RUNNING);
2242 SCSI_LOG_ERROR_RECOVERY(1,
2243 shost_printk(KERN_INFO, shost,
2244 "Error handler scsi_eh_%d exiting\n",
2246 shost->ehandler = NULL;
2251 * Function: scsi_report_bus_reset()
2253 * Purpose: Utility function used by low-level drivers to report that
2254 * they have observed a bus reset on the bus being handled.
2256 * Arguments: shost - Host in question
2257 * channel - channel on which reset was observed.
2261 * Lock status: Host lock must be held.
2263 * Notes: This only needs to be called if the reset is one which
2264 * originates from an unknown location. Resets originated
2265 * by the mid-level itself don't need to call this, but there
2266 * should be no harm.
2268 * The main purpose of this is to make sure that a CHECK_CONDITION
2269 * is properly treated.
2271 void scsi_report_bus_reset(struct Scsi_Host *shost, int channel)
2273 struct scsi_device *sdev;
2275 __shost_for_each_device(sdev, shost) {
2276 if (channel == sdev_channel(sdev))
2277 __scsi_report_device_reset(sdev, NULL);
2280 EXPORT_SYMBOL(scsi_report_bus_reset);
2283 * Function: scsi_report_device_reset()
2285 * Purpose: Utility function used by low-level drivers to report that
2286 * they have observed a device reset on the device being handled.
2288 * Arguments: shost - Host in question
2289 * channel - channel on which reset was observed
2290 * target - target on which reset was observed
2294 * Lock status: Host lock must be held
2296 * Notes: This only needs to be called if the reset is one which
2297 * originates from an unknown location. Resets originated
2298 * by the mid-level itself don't need to call this, but there
2299 * should be no harm.
2301 * The main purpose of this is to make sure that a CHECK_CONDITION
2302 * is properly treated.
2304 void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target)
2306 struct scsi_device *sdev;
2308 __shost_for_each_device(sdev, shost) {
2309 if (channel == sdev_channel(sdev) &&
2310 target == sdev_id(sdev))
2311 __scsi_report_device_reset(sdev, NULL);
2314 EXPORT_SYMBOL(scsi_report_device_reset);
2317 scsi_reset_provider_done_command(struct scsi_cmnd *scmd)
2322 * scsi_ioctl_reset: explicitly reset a host/bus/target/device
2323 * @dev: scsi_device to operate on
2324 * @arg: reset type (see sg.h)
2327 scsi_ioctl_reset(struct scsi_device *dev, int __user *arg)
2329 struct scsi_cmnd *scmd;
2330 struct Scsi_Host *shost = dev->host;
2332 unsigned long flags;
2333 int error = 0, rtn, val;
2335 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2338 error = get_user(val, arg);
2342 if (scsi_autopm_get_host(shost) < 0)
2346 scmd = scsi_get_command(dev, GFP_KERNEL);
2348 goto out_put_autopm_host;
2350 blk_rq_init(NULL, &req);
2351 scmd->request = &req;
2353 scmd->cmnd = req.cmd;
2355 scmd->scsi_done = scsi_reset_provider_done_command;
2356 memset(&scmd->sdb, 0, sizeof(scmd->sdb));
2360 scmd->sc_data_direction = DMA_BIDIRECTIONAL;
2362 spin_lock_irqsave(shost->host_lock, flags);
2363 shost->tmf_in_progress = 1;
2364 spin_unlock_irqrestore(shost->host_lock, flags);
2366 switch (val & ~SG_SCSI_RESET_NO_ESCALATE) {
2367 case SG_SCSI_RESET_NOTHING:
2370 case SG_SCSI_RESET_DEVICE:
2371 rtn = scsi_try_bus_device_reset(scmd);
2372 if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
2375 case SG_SCSI_RESET_TARGET:
2376 rtn = scsi_try_target_reset(scmd);
2377 if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
2380 case SG_SCSI_RESET_BUS:
2381 rtn = scsi_try_bus_reset(scmd);
2382 if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
2385 case SG_SCSI_RESET_HOST:
2386 rtn = scsi_try_host_reset(scmd);
2395 error = (rtn == SUCCESS) ? 0 : -EIO;
2397 spin_lock_irqsave(shost->host_lock, flags);
2398 shost->tmf_in_progress = 0;
2399 spin_unlock_irqrestore(shost->host_lock, flags);
2402 * be sure to wake up anyone who was sleeping or had their queue
2403 * suspended while we performed the TMF.
2405 SCSI_LOG_ERROR_RECOVERY(3,
2406 shost_printk(KERN_INFO, shost,
2407 "waking up host to restart after TMF\n"));
2409 wake_up(&shost->host_wait);
2410 scsi_run_host_queues(shost);
2412 scsi_put_command(scmd);
2414 out_put_autopm_host:
2415 scsi_autopm_put_host(shost);
2418 EXPORT_SYMBOL(scsi_ioctl_reset);
2420 bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd,
2421 struct scsi_sense_hdr *sshdr)
2423 return scsi_normalize_sense(cmd->sense_buffer,
2424 SCSI_SENSE_BUFFERSIZE, sshdr);
2426 EXPORT_SYMBOL(scsi_command_normalize_sense);
2429 * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format)
2430 * @sense_buffer: byte array of sense data
2431 * @sb_len: number of valid bytes in sense_buffer
2432 * @info_out: pointer to 64 integer where 8 or 4 byte information
2433 * field will be placed if found.
2436 * 1 if information field found, 0 if not found.
2438 int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
2447 switch (sense_buffer[0] & 0x7f) {
2450 if (sense_buffer[0] & 0x80) {
2451 *info_out = (sense_buffer[3] << 24) +
2452 (sense_buffer[4] << 16) +
2453 (sense_buffer[5] << 8) + sense_buffer[6];
2459 ucp = scsi_sense_desc_find(sense_buffer, sb_len,
2461 if (ucp && (0xa == ucp[1])) {
2463 for (j = 0; j < 8; ++j) {
2476 EXPORT_SYMBOL(scsi_get_sense_info_fld);