2 * scsi_error.c Copyright (C) 1997 Eric Youngdale
4 * SCSI error/timeout handling
5 * Initial versions: Eric Youngdale. Based upon conversations with
6 * Leonard Zubkoff and David Miller at Linux Expo,
7 * ideas originating from all over the place.
9 * Restructured scsi_unjam_host and associated functions.
10 * September 04, 2002 Mike Anderson (andmike@us.ibm.com)
12 * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and
14 * September 30, 2002 Mike Anderson (andmike@us.ibm.com)
17 #include <linux/module.h>
18 #include <linux/sched.h>
19 #include <linux/timer.h>
20 #include <linux/string.h>
21 #include <linux/slab.h>
22 #include <linux/kernel.h>
23 #include <linux/kthread.h>
24 #include <linux/interrupt.h>
25 #include <linux/blkdev.h>
26 #include <linux/delay.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_dbg.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_ioctl.h>
37 #include "scsi_priv.h"
38 #include "scsi_logging.h"
40 #define SENSE_TIMEOUT (10*HZ)
41 #define START_UNIT_TIMEOUT (30*HZ)
44 * These should *probably* be handled by the host itself.
45 * Since it is allowed to sleep, it probably should.
47 #define BUS_RESET_SETTLE_TIME (10)
48 #define HOST_RESET_SETTLE_TIME (10)
50 /* called with shost->host_lock held */
51 void scsi_eh_wakeup(struct Scsi_Host *shost)
53 if (shost->host_busy == shost->host_failed) {
54 wake_up_process(shost->ehandler);
55 SCSI_LOG_ERROR_RECOVERY(5,
56 printk("Waking error handler thread\n"));
61 * scsi_schedule_eh - schedule EH for SCSI host
62 * @shost: SCSI host to invoke error handling on.
64 * Schedule SCSI EH without scmd.
66 void scsi_schedule_eh(struct Scsi_Host *shost)
70 spin_lock_irqsave(shost->host_lock, flags);
72 if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 ||
73 scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) {
74 shost->host_eh_scheduled++;
75 scsi_eh_wakeup(shost);
78 spin_unlock_irqrestore(shost->host_lock, flags);
80 EXPORT_SYMBOL_GPL(scsi_schedule_eh);
83 * scsi_eh_scmd_add - add scsi cmd to error handling.
84 * @scmd: scmd to run eh on.
85 * @eh_flag: optional SCSI_EH flag.
90 int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
92 struct Scsi_Host *shost = scmd->device->host;
99 spin_lock_irqsave(shost->host_lock, flags);
100 if (scsi_host_set_state(shost, SHOST_RECOVERY))
101 if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY))
105 scmd->eh_eflags |= eh_flag;
106 list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q);
107 shost->host_failed++;
108 scsi_eh_wakeup(shost);
110 spin_unlock_irqrestore(shost->host_lock, flags);
115 * scsi_add_timer - Start timeout timer for a single scsi command.
116 * @scmd: scsi command that is about to start running.
117 * @timeout: amount of time to allow this command to run.
118 * @complete: timeout function to call if timer isn't canceled.
121 * This should be turned into an inline function. Each scsi command
122 * has its own timer, and as it is added to the queue, we set up the
123 * timer. When the command completes, we cancel the timer.
125 void scsi_add_timer(struct scsi_cmnd *scmd, int timeout,
126 void (*complete)(struct scsi_cmnd *))
130 * If the clock was already running for this command, then
131 * first delete the timer. The timer handling code gets rather
132 * confused if we don't do this.
134 if (scmd->eh_timeout.function)
135 del_timer(&scmd->eh_timeout);
137 scmd->eh_timeout.data = (unsigned long)scmd;
138 scmd->eh_timeout.expires = jiffies + timeout;
139 scmd->eh_timeout.function = (void (*)(unsigned long)) complete;
141 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p, time:"
142 " %d, (%p)\n", __FUNCTION__,
143 scmd, timeout, complete));
145 add_timer(&scmd->eh_timeout);
149 * scsi_delete_timer - Delete/cancel timer for a given function.
150 * @scmd: Cmd that we are canceling timer for
153 * This should be turned into an inline function.
156 * 1 if we were able to detach the timer. 0 if we blew it, and the
157 * timer function has already started to run.
159 int scsi_delete_timer(struct scsi_cmnd *scmd)
163 rtn = del_timer(&scmd->eh_timeout);
165 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p,"
166 " rtn: %d\n", __FUNCTION__,
169 scmd->eh_timeout.data = (unsigned long)NULL;
170 scmd->eh_timeout.function = NULL;
176 * scsi_times_out - Timeout function for normal scsi commands.
177 * @scmd: Cmd that is timing out.
180 * We do not need to lock this. There is the potential for a race
181 * only in that the normal completion handling might run, but if the
182 * normal completion function determines that the timer has already
183 * fired, then it mustn't do anything.
185 void scsi_times_out(struct scsi_cmnd *scmd)
187 scsi_log_completion(scmd, TIMEOUT_ERROR);
189 if (scmd->device->host->transportt->eh_timed_out)
190 switch (scmd->device->host->transportt->eh_timed_out(scmd)) {
195 scsi_add_timer(scmd, scmd->timeout_per_command,
202 if (unlikely(!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) {
203 scmd->result |= DID_TIME_OUT << 16;
209 * scsi_block_when_processing_errors - Prevent cmds from being queued.
210 * @sdev: Device on which we are performing recovery.
213 * We block until the host is out of error recovery, and then check to
214 * see whether the host or the device is offline.
217 * 0 when dev was taken offline by error recovery. 1 OK to proceed.
219 int scsi_block_when_processing_errors(struct scsi_device *sdev)
223 wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host));
225 online = scsi_device_online(sdev);
227 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __FUNCTION__,
232 EXPORT_SYMBOL(scsi_block_when_processing_errors);
234 #ifdef CONFIG_SCSI_LOGGING
236 * scsi_eh_prt_fail_stats - Log info on failures.
237 * @shost: scsi host being recovered.
238 * @work_q: Queue of scsi cmds to process.
240 static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost,
241 struct list_head *work_q)
243 struct scsi_cmnd *scmd;
244 struct scsi_device *sdev;
245 int total_failures = 0;
248 int devices_failed = 0;
250 shost_for_each_device(sdev, shost) {
251 list_for_each_entry(scmd, work_q, eh_entry) {
252 if (scmd->device == sdev) {
254 if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD)
261 if (cmd_cancel || cmd_failed) {
262 SCSI_LOG_ERROR_RECOVERY(3,
263 sdev_printk(KERN_INFO, sdev,
264 "%s: cmds failed: %d, cancel: %d\n",
265 __FUNCTION__, cmd_failed,
273 SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d"
274 " devices require eh work\n",
275 total_failures, devices_failed));
280 * scsi_check_sense - Examine scsi cmd sense
281 * @scmd: Cmd to have sense checked.
284 * SUCCESS or FAILED or NEEDS_RETRY
287 * When a deferred error is detected the current command has
288 * not been executed and needs retrying.
290 static int scsi_check_sense(struct scsi_cmnd *scmd)
292 struct scsi_sense_hdr sshdr;
294 if (! scsi_command_normalize_sense(scmd, &sshdr))
295 return FAILED; /* no valid sense data */
297 if (scsi_sense_is_deferred(&sshdr))
301 * Previous logic looked for FILEMARK, EOM or ILI which are
302 * mainly associated with tapes and returned SUCCESS.
304 if (sshdr.response_code == 0x70) {
306 if (scmd->sense_buffer[2] & 0xe0)
310 * descriptor format: look for "stream commands sense data
311 * descriptor" (see SSC-3). Assume single sense data
312 * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG.
314 if ((sshdr.additional_length > 3) &&
315 (scmd->sense_buffer[8] == 0x4) &&
316 (scmd->sense_buffer[11] & 0xe0))
320 switch (sshdr.sense_key) {
323 case RECOVERED_ERROR:
324 return /* soft_error */ SUCCESS;
326 case ABORTED_COMMAND:
331 * if we are expecting a cc/ua because of a bus reset that we
332 * performed, treat this just as a retry. otherwise this is
333 * information that we should pass up to the upper-level driver
334 * so that we can deal with it there.
336 if (scmd->device->expecting_cc_ua) {
337 scmd->device->expecting_cc_ua = 0;
341 * if the device is in the process of becoming ready, we
344 if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01))
347 * if the device is not started, we need to wake
348 * the error handler to start the motor
350 if (scmd->device->allow_restart &&
351 (sshdr.asc == 0x04) && (sshdr.ascq == 0x02))
355 /* these three are not supported */
357 case VOLUME_OVERFLOW:
362 if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */
363 sshdr.asc == 0x13 || /* AMNF DATA FIELD */
364 sshdr.asc == 0x14) { /* RECORD NOT FOUND */
370 if (scmd->device->retry_hwerror)
375 case ILLEGAL_REQUEST:
384 * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD.
385 * @scmd: SCSI cmd to examine.
388 * This is *only* called when we are examining the status of commands
389 * queued during error recovery. the main difference here is that we
390 * don't allow for the possibility of retries here, and we are a lot
391 * more restrictive about what we consider acceptable.
393 static int scsi_eh_completed_normally(struct scsi_cmnd *scmd)
396 * first check the host byte, to see if there is anything in there
397 * that would indicate what we need to do.
399 if (host_byte(scmd->result) == DID_RESET) {
401 * rats. we are already in the error handler, so we now
402 * get to try and figure out what to do next. if the sense
403 * is valid, we have a pretty good idea of what to do.
404 * if not, we mark it as FAILED.
406 return scsi_check_sense(scmd);
408 if (host_byte(scmd->result) != DID_OK)
412 * next, check the message byte.
414 if (msg_byte(scmd->result) != COMMAND_COMPLETE)
418 * now, check the status byte to see if this indicates
421 switch (status_byte(scmd->result)) {
423 case COMMAND_TERMINATED:
425 case CHECK_CONDITION:
426 return scsi_check_sense(scmd);
428 case INTERMEDIATE_GOOD:
429 case INTERMEDIATE_C_GOOD:
431 * who knows? FIXME(eric)
436 case RESERVATION_CONFLICT:
444 * scsi_eh_done - Completion function for error handling.
445 * @scmd: Cmd that is done.
447 static void scsi_eh_done(struct scsi_cmnd *scmd)
449 struct completion *eh_action;
451 SCSI_LOG_ERROR_RECOVERY(3,
452 printk("%s scmd: %p result: %x\n",
453 __FUNCTION__, scmd, scmd->result));
455 eh_action = scmd->device->host->eh_action;
461 * scsi_send_eh_cmnd - submit a scsi command as part of error recory
462 * @scmd: SCSI command structure to hijack
464 * @cmnd_size: size in bytes of @cmnd
465 * @timeout: timeout for this request
466 * @copy_sense: request sense data if set to 1
468 * This function is used to send a scsi command down to a target device
469 * as part of the error recovery process. If @copy_sense is 0 the command
470 * sent must be one that does not transfer any data. If @copy_sense is 1
471 * the command must be REQUEST_SENSE and this functions copies out the
472 * sense buffer it got into @scmd->sense_buffer.
475 * SUCCESS or FAILED or NEEDS_RETRY
477 static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
478 int cmnd_size, int timeout, int copy_sense)
480 struct scsi_device *sdev = scmd->device;
481 struct Scsi_Host *shost = sdev->host;
482 int old_result = scmd->result;
483 DECLARE_COMPLETION_ONSTACK(done);
484 unsigned long timeleft;
486 struct scatterlist sgl;
487 unsigned char old_cmnd[MAX_COMMAND_SIZE];
488 enum dma_data_direction old_data_direction;
489 unsigned short old_use_sg;
490 unsigned char old_cmd_len;
491 unsigned old_bufflen;
496 * We need saved copies of a number of fields - this is because
497 * error handling may need to overwrite these with different values
498 * to run different commands, and once error handling is complete,
499 * we will need to restore these values prior to running the actual
502 old_buffer = scmd->request_buffer;
503 old_bufflen = scmd->request_bufflen;
504 memcpy(old_cmnd, scmd->cmnd, sizeof(scmd->cmnd));
505 old_data_direction = scmd->sc_data_direction;
506 old_cmd_len = scmd->cmd_len;
507 old_use_sg = scmd->use_sg;
509 memset(scmd->cmnd, 0, sizeof(scmd->cmnd));
510 memcpy(scmd->cmnd, cmnd, cmnd_size);
513 gfp_t gfp_mask = GFP_ATOMIC;
515 if (shost->hostt->unchecked_isa_dma)
516 gfp_mask |= __GFP_DMA;
518 sgl.page = alloc_page(gfp_mask);
524 scmd->sc_data_direction = DMA_FROM_DEVICE;
525 scmd->request_bufflen = sgl.length;
526 scmd->request_buffer = &sgl;
529 scmd->request_buffer = NULL;
530 scmd->request_bufflen = 0;
531 scmd->sc_data_direction = DMA_NONE;
536 scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
538 if (sdev->scsi_level <= SCSI_2)
539 scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
540 (sdev->lun << 5 & 0xe0);
543 * Zero the sense buffer. The scsi spec mandates that any
544 * untransferred sense data should be interpreted as being zero.
546 memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
548 shost->eh_action = &done;
550 spin_lock_irqsave(shost->host_lock, flags);
552 shost->hostt->queuecommand(scmd, scsi_eh_done);
553 spin_unlock_irqrestore(shost->host_lock, flags);
555 timeleft = wait_for_completion_timeout(&done, timeout);
557 shost->eh_action = NULL;
559 scsi_log_completion(scmd, SUCCESS);
561 SCSI_LOG_ERROR_RECOVERY(3,
562 printk("%s: scmd: %p, timeleft: %ld\n",
563 __FUNCTION__, scmd, timeleft));
566 * If there is time left scsi_eh_done got called, and we will
567 * examine the actual status codes to see whether the command
568 * actually did complete normally, else tell the host to forget
569 * about this command.
572 rtn = scsi_eh_completed_normally(scmd);
573 SCSI_LOG_ERROR_RECOVERY(3,
574 printk("%s: scsi_eh_completed_normally %x\n",
588 * FIXME(eric) - we are not tracking whether we could
589 * abort a timed out command or not. not sure how
590 * we should treat them differently anyways.
592 if (shost->hostt->eh_abort_handler)
593 shost->hostt->eh_abort_handler(scmd);
599 * Last chance to have valid sense data.
602 if (!SCSI_SENSE_VALID(scmd)) {
603 memcpy(scmd->sense_buffer, scmd->request_buffer,
604 sizeof(scmd->sense_buffer));
606 __free_page(sgl.page);
611 * Restore original data
613 scmd->request_buffer = old_buffer;
614 scmd->request_bufflen = old_bufflen;
615 memcpy(scmd->cmnd, old_cmnd, sizeof(scmd->cmnd));
616 scmd->sc_data_direction = old_data_direction;
617 scmd->cmd_len = old_cmd_len;
618 scmd->use_sg = old_use_sg;
619 scmd->result = old_result;
624 * scsi_request_sense - Request sense data from a particular target.
625 * @scmd: SCSI cmd for request sense.
628 * Some hosts automatically obtain this information, others require
629 * that we obtain it on our own. This function will *not* return until
630 * the command either times out, or it completes.
632 static int scsi_request_sense(struct scsi_cmnd *scmd)
634 static unsigned char generic_sense[6] =
635 {REQUEST_SENSE, 0, 0, 0, 252, 0};
637 return scsi_send_eh_cmnd(scmd, generic_sense, 6, SENSE_TIMEOUT, 1);
641 * scsi_eh_finish_cmd - Handle a cmd that eh is finished with.
642 * @scmd: Original SCSI cmd that eh has finished.
643 * @done_q: Queue for processed commands.
646 * We don't want to use the normal command completion while we are are
647 * still handling errors - it may cause other commands to be queued,
648 * and that would disturb what we are doing. thus we really want to
649 * keep a list of pending commands for final completion, and once we
650 * are ready to leave error handling we handle completion for real.
652 void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q)
654 scmd->device->host->host_failed--;
656 list_move_tail(&scmd->eh_entry, done_q);
658 EXPORT_SYMBOL(scsi_eh_finish_cmd);
661 * scsi_eh_get_sense - Get device sense data.
662 * @work_q: Queue of commands to process.
663 * @done_q: Queue of proccessed commands..
666 * See if we need to request sense information. if so, then get it
667 * now, so we have a better idea of what to do.
670 * This has the unfortunate side effect that if a shost adapter does
671 * not automatically request sense information, that we end up shutting
672 * it down before we request it.
674 * All drivers should request sense information internally these days,
675 * so for now all I have to say is tough noogies if you end up in here.
677 * XXX: Long term this code should go away, but that needs an audit of
680 int scsi_eh_get_sense(struct list_head *work_q,
681 struct list_head *done_q)
683 struct scsi_cmnd *scmd, *next;
686 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
687 if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) ||
688 SCSI_SENSE_VALID(scmd))
691 SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd,
692 "%s: requesting sense\n",
694 rtn = scsi_request_sense(scmd);
698 SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p"
699 " result %x\n", scmd,
701 SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd));
703 rtn = scsi_decide_disposition(scmd);
706 * if the result was normal, then just pass it along to the
710 /* we don't want this command reissued, just
711 * finished with the sense data, so set
712 * retries to the max allowed to ensure it
713 * won't get reissued */
714 scmd->retries = scmd->allowed;
715 else if (rtn != NEEDS_RETRY)
718 scsi_eh_finish_cmd(scmd, done_q);
721 return list_empty(work_q);
723 EXPORT_SYMBOL_GPL(scsi_eh_get_sense);
726 * scsi_try_to_abort_cmd - Ask host to abort a running command.
727 * @scmd: SCSI cmd to abort from Lower Level.
730 * This function will not return until the user's completion function
731 * has been called. there is no timeout on this operation. if the
732 * author of the low-level driver wishes this operation to be timed,
733 * they can provide this facility themselves. helper functions in
734 * scsi_error.c can be supplied to make this easier to do.
736 static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd)
738 if (!scmd->device->host->hostt->eh_abort_handler)
742 * scsi_done was called just after the command timed out and before
743 * we had a chance to process it. (db)
745 if (scmd->serial_number == 0)
747 return scmd->device->host->hostt->eh_abort_handler(scmd);
751 * scsi_eh_tur - Send TUR to device.
752 * @scmd: Scsi cmd to send TUR
755 * 0 - Device is ready. 1 - Device NOT ready.
757 static int scsi_eh_tur(struct scsi_cmnd *scmd)
759 static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0};
760 int retry_cnt = 1, rtn;
763 rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0);
765 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n",
766 __FUNCTION__, scmd, rtn));
781 * scsi_eh_abort_cmds - abort canceled commands.
782 * @shost: scsi host being recovered.
783 * @eh_done_q: list_head for processed commands.
786 * Try and see whether or not it makes sense to try and abort the
787 * running command. this only works out to be the case if we have one
788 * command that has timed out. if the command simply failed, it makes
789 * no sense to try and abort the command, since as far as the shost
790 * adapter is concerned, it isn't running.
792 static int scsi_eh_abort_cmds(struct list_head *work_q,
793 struct list_head *done_q)
795 struct scsi_cmnd *scmd, *next;
798 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
799 if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD))
801 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:"
802 "0x%p\n", current->comm,
804 rtn = scsi_try_to_abort_cmd(scmd);
805 if (rtn == SUCCESS) {
806 scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD;
807 if (!scsi_device_online(scmd->device) ||
808 !scsi_eh_tur(scmd)) {
809 scsi_eh_finish_cmd(scmd, done_q);
813 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting"
820 return list_empty(work_q);
824 * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
825 * @scmd: SCSI cmd used to send BDR
828 * There is no timeout for this operation. if this operation is
829 * unreliable for a given host, then the host itself needs to put a
830 * timer on it, and set the host back to a consistent state prior to
833 static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
837 if (!scmd->device->host->hostt->eh_device_reset_handler)
840 rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd);
841 if (rtn == SUCCESS) {
842 scmd->device->was_reset = 1;
843 scmd->device->expecting_cc_ua = 1;
850 * scsi_eh_try_stu - Send START_UNIT to device.
851 * @scmd: Scsi cmd to send START_UNIT
854 * 0 - Device is ready. 1 - Device NOT ready.
856 static int scsi_eh_try_stu(struct scsi_cmnd *scmd)
858 static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0};
860 if (scmd->device->allow_restart) {
863 rtn = scsi_send_eh_cmnd(scmd, stu_command, 6,
864 START_UNIT_TIMEOUT, 0);
873 * scsi_eh_stu - send START_UNIT if needed
874 * @shost: scsi host being recovered.
875 * @eh_done_q: list_head for processed commands.
878 * If commands are failing due to not ready, initializing command required,
879 * try revalidating the device, which will end up sending a start unit.
881 static int scsi_eh_stu(struct Scsi_Host *shost,
882 struct list_head *work_q,
883 struct list_head *done_q)
885 struct scsi_cmnd *scmd, *stu_scmd, *next;
886 struct scsi_device *sdev;
888 shost_for_each_device(sdev, shost) {
890 list_for_each_entry(scmd, work_q, eh_entry)
891 if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) &&
892 scsi_check_sense(scmd) == FAILED ) {
900 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:"
901 " 0x%p\n", current->comm, sdev));
903 if (!scsi_eh_try_stu(stu_scmd)) {
904 if (!scsi_device_online(sdev) ||
905 !scsi_eh_tur(stu_scmd)) {
906 list_for_each_entry_safe(scmd, next,
908 if (scmd->device == sdev)
909 scsi_eh_finish_cmd(scmd, done_q);
913 SCSI_LOG_ERROR_RECOVERY(3,
914 printk("%s: START_UNIT failed to sdev:"
915 " 0x%p\n", current->comm, sdev));
919 return list_empty(work_q);
924 * scsi_eh_bus_device_reset - send bdr if needed
925 * @shost: scsi host being recovered.
926 * @eh_done_q: list_head for processed commands.
929 * Try a bus device reset. still, look to see whether we have multiple
930 * devices that are jammed or not - if we have multiple devices, it
931 * makes no sense to try bus_device_reset - we really would need to try
932 * a bus_reset instead.
934 static int scsi_eh_bus_device_reset(struct Scsi_Host *shost,
935 struct list_head *work_q,
936 struct list_head *done_q)
938 struct scsi_cmnd *scmd, *bdr_scmd, *next;
939 struct scsi_device *sdev;
942 shost_for_each_device(sdev, shost) {
944 list_for_each_entry(scmd, work_q, eh_entry)
945 if (scmd->device == sdev) {
953 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:"
954 " 0x%p\n", current->comm,
956 rtn = scsi_try_bus_device_reset(bdr_scmd);
957 if (rtn == SUCCESS) {
958 if (!scsi_device_online(sdev) ||
959 !scsi_eh_tur(bdr_scmd)) {
960 list_for_each_entry_safe(scmd, next,
962 if (scmd->device == sdev)
963 scsi_eh_finish_cmd(scmd,
968 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR"
976 return list_empty(work_q);
980 * scsi_try_bus_reset - ask host to perform a bus reset
981 * @scmd: SCSI cmd to send bus reset.
983 static int scsi_try_bus_reset(struct scsi_cmnd *scmd)
988 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n",
991 if (!scmd->device->host->hostt->eh_bus_reset_handler)
994 rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd);
996 if (rtn == SUCCESS) {
997 if (!scmd->device->host->hostt->skip_settle_delay)
998 ssleep(BUS_RESET_SETTLE_TIME);
999 spin_lock_irqsave(scmd->device->host->host_lock, flags);
1000 scsi_report_bus_reset(scmd->device->host,
1001 scmd_channel(scmd));
1002 spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
1009 * scsi_try_host_reset - ask host adapter to reset itself
1010 * @scmd: SCSI cmd to send hsot reset.
1012 static int scsi_try_host_reset(struct scsi_cmnd *scmd)
1014 unsigned long flags;
1017 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n",
1020 if (!scmd->device->host->hostt->eh_host_reset_handler)
1023 rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd);
1025 if (rtn == SUCCESS) {
1026 if (!scmd->device->host->hostt->skip_settle_delay)
1027 ssleep(HOST_RESET_SETTLE_TIME);
1028 spin_lock_irqsave(scmd->device->host->host_lock, flags);
1029 scsi_report_bus_reset(scmd->device->host,
1030 scmd_channel(scmd));
1031 spin_unlock_irqrestore(scmd->device->host->host_lock, flags);
1038 * scsi_eh_bus_reset - send a bus reset
1039 * @shost: scsi host being recovered.
1040 * @eh_done_q: list_head for processed commands.
1042 static int scsi_eh_bus_reset(struct Scsi_Host *shost,
1043 struct list_head *work_q,
1044 struct list_head *done_q)
1046 struct scsi_cmnd *scmd, *chan_scmd, *next;
1047 unsigned int channel;
1051 * we really want to loop over the various channels, and do this on
1052 * a channel by channel basis. we should also check to see if any
1053 * of the failed commands are on soft_reset devices, and if so, skip
1057 for (channel = 0; channel <= shost->max_channel; channel++) {
1059 list_for_each_entry(scmd, work_q, eh_entry) {
1060 if (channel == scmd_channel(scmd)) {
1064 * FIXME add back in some support for
1065 * soft_reset devices.
1072 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:"
1073 " %d\n", current->comm,
1075 rtn = scsi_try_bus_reset(chan_scmd);
1076 if (rtn == SUCCESS) {
1077 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
1078 if (channel == scmd_channel(scmd))
1079 if (!scsi_device_online(scmd->device) ||
1081 scsi_eh_finish_cmd(scmd,
1085 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST"
1086 " failed chan: %d\n",
1091 return list_empty(work_q);
1095 * scsi_eh_host_reset - send a host reset
1096 * @work_q: list_head for processed commands.
1097 * @done_q: list_head for processed commands.
1099 static int scsi_eh_host_reset(struct list_head *work_q,
1100 struct list_head *done_q)
1102 struct scsi_cmnd *scmd, *next;
1105 if (!list_empty(work_q)) {
1106 scmd = list_entry(work_q->next,
1107 struct scsi_cmnd, eh_entry);
1109 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n"
1112 rtn = scsi_try_host_reset(scmd);
1113 if (rtn == SUCCESS) {
1114 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
1115 if (!scsi_device_online(scmd->device) ||
1116 (!scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) ||
1118 scsi_eh_finish_cmd(scmd, done_q);
1121 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST"
1126 return list_empty(work_q);
1130 * scsi_eh_offline_sdevs - offline scsi devices that fail to recover
1131 * @work_q: list_head for processed commands.
1132 * @done_q: list_head for processed commands.
1135 static void scsi_eh_offline_sdevs(struct list_head *work_q,
1136 struct list_head *done_q)
1138 struct scsi_cmnd *scmd, *next;
1140 list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
1141 sdev_printk(KERN_INFO, scmd->device,
1142 "scsi: Device offlined - not"
1143 " ready after error recovery\n");
1144 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1145 if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) {
1147 * FIXME: Handle lost cmds.
1150 scsi_eh_finish_cmd(scmd, done_q);
1156 * scsi_decide_disposition - Disposition a cmd on return from LLD.
1157 * @scmd: SCSI cmd to examine.
1160 * This is *only* called when we are examining the status after sending
1161 * out the actual data command. any commands that are queued for error
1162 * recovery (e.g. test_unit_ready) do *not* come through here.
1164 * When this routine returns failed, it means the error handler thread
1165 * is woken. In cases where the error code indicates an error that
1166 * doesn't require the error handler read (i.e. we don't need to
1167 * abort/reset), this function should return SUCCESS.
1169 int scsi_decide_disposition(struct scsi_cmnd *scmd)
1174 * if the device is offline, then we clearly just pass the result back
1175 * up to the top level.
1177 if (!scsi_device_online(scmd->device)) {
1178 SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report"
1185 * first check the host byte, to see if there is anything in there
1186 * that would indicate what we need to do.
1188 switch (host_byte(scmd->result)) {
1189 case DID_PASSTHROUGH:
1191 * no matter what, pass this through to the upper layer.
1192 * nuke this special code so that it looks like we are saying
1195 scmd->result &= 0xff00ffff;
1199 * looks good. drop through, and check the next byte.
1202 case DID_NO_CONNECT:
1203 case DID_BAD_TARGET:
1206 * note - this means that we just report the status back
1207 * to the top level driver, not that we actually think
1208 * that it indicates SUCCESS.
1212 * when the low level driver returns did_soft_error,
1213 * it is responsible for keeping an internal retry counter
1214 * in order to avoid endless loops (db)
1216 * actually this is a bug in this function here. we should
1217 * be mindful of the maximum number of retries specified
1218 * and not get stuck in a loop.
1220 case DID_SOFT_ERROR:
1226 return ADD_TO_MLQUEUE;
1229 if (msg_byte(scmd->result) == COMMAND_COMPLETE &&
1230 status_byte(scmd->result) == RESERVATION_CONFLICT)
1232 * execute reservation conflict processing code
1243 * when we scan the bus, we get timeout messages for
1244 * these commands if there is no device available.
1245 * other hosts report did_no_connect for the same thing.
1247 if ((scmd->cmnd[0] == TEST_UNIT_READY ||
1248 scmd->cmnd[0] == INQUIRY)) {
1260 * next, check the message byte.
1262 if (msg_byte(scmd->result) != COMMAND_COMPLETE)
1266 * check the status byte to see if this indicates anything special.
1268 switch (status_byte(scmd->result)) {
1271 * the case of trying to send too many commands to a
1272 * tagged queueing device.
1276 * device can't talk to us at the moment. Should only
1277 * occur (SAM-3) when the task queue is empty, so will cause
1278 * the empty queue handling to trigger a stall in the
1281 return ADD_TO_MLQUEUE;
1283 case COMMAND_TERMINATED:
1286 case CHECK_CONDITION:
1287 rtn = scsi_check_sense(scmd);
1288 if (rtn == NEEDS_RETRY)
1290 /* if rtn == FAILED, we have no sense information;
1291 * returning FAILED will wake the error handler thread
1292 * to collect the sense and redo the decide
1295 case CONDITION_GOOD:
1296 case INTERMEDIATE_GOOD:
1297 case INTERMEDIATE_C_GOOD:
1300 * who knows? FIXME(eric)
1304 case RESERVATION_CONFLICT:
1305 sdev_printk(KERN_INFO, scmd->device,
1306 "reservation conflict\n");
1307 return SUCCESS; /* causes immediate i/o error */
1315 /* we requeue for retry because the error was retryable, and
1316 * the request was not marked fast fail. Note that above,
1317 * even if the request is marked fast fail, we still requeue
1318 * for queue congestion conditions (QUEUE_FULL or BUSY) */
1319 if ((++scmd->retries) <= scmd->allowed
1320 && !blk_noretry_request(scmd->request)) {
1324 * no more retries - report this one back to upper level.
1331 * scsi_eh_lock_door - Prevent medium removal for the specified device
1332 * @sdev: SCSI device to prevent medium removal
1335 * We must be called from process context; scsi_allocate_request()
1339 * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the
1340 * head of the devices request queue, and continue.
1343 * scsi_allocate_request() may sleep waiting for existing requests to
1344 * be processed. However, since we haven't kicked off any request
1345 * processing for this host, this may deadlock.
1347 * If scsi_allocate_request() fails for what ever reason, we
1348 * completely forget to lock the door.
1350 static void scsi_eh_lock_door(struct scsi_device *sdev)
1352 unsigned char cmnd[MAX_COMMAND_SIZE];
1354 cmnd[0] = ALLOW_MEDIUM_REMOVAL;
1358 cmnd[4] = SCSI_REMOVAL_PREVENT;
1361 scsi_execute_async(sdev, cmnd, 6, DMA_NONE, NULL, 0, 0, 10 * HZ,
1362 5, NULL, NULL, GFP_KERNEL);
1367 * scsi_restart_operations - restart io operations to the specified host.
1368 * @shost: Host we are restarting.
1371 * When we entered the error handler, we blocked all further i/o to
1372 * this device. we need to 'reverse' this process.
1374 static void scsi_restart_operations(struct Scsi_Host *shost)
1376 struct scsi_device *sdev;
1377 unsigned long flags;
1380 * If the door was locked, we need to insert a door lock request
1381 * onto the head of the SCSI request queue for the device. There
1382 * is no point trying to lock the door of an off-line device.
1384 shost_for_each_device(sdev, shost) {
1385 if (scsi_device_online(sdev) && sdev->locked)
1386 scsi_eh_lock_door(sdev);
1390 * next free up anything directly waiting upon the host. this
1391 * will be requests for character device operations, and also for
1392 * ioctls to queued block devices.
1394 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n",
1397 spin_lock_irqsave(shost->host_lock, flags);
1398 if (scsi_host_set_state(shost, SHOST_RUNNING))
1399 if (scsi_host_set_state(shost, SHOST_CANCEL))
1400 BUG_ON(scsi_host_set_state(shost, SHOST_DEL));
1401 spin_unlock_irqrestore(shost->host_lock, flags);
1403 wake_up(&shost->host_wait);
1406 * finally we need to re-initiate requests that may be pending. we will
1407 * have had everything blocked while error handling is taking place, and
1408 * now that error recovery is done, we will need to ensure that these
1409 * requests are started.
1411 scsi_run_host_queues(shost);
1415 * scsi_eh_ready_devs - check device ready state and recover if not.
1416 * @shost: host to be recovered.
1417 * @eh_done_q: list_head for processed commands.
1420 void scsi_eh_ready_devs(struct Scsi_Host *shost,
1421 struct list_head *work_q,
1422 struct list_head *done_q)
1424 if (!scsi_eh_stu(shost, work_q, done_q))
1425 if (!scsi_eh_bus_device_reset(shost, work_q, done_q))
1426 if (!scsi_eh_bus_reset(shost, work_q, done_q))
1427 if (!scsi_eh_host_reset(work_q, done_q))
1428 scsi_eh_offline_sdevs(work_q, done_q);
1430 EXPORT_SYMBOL_GPL(scsi_eh_ready_devs);
1433 * scsi_eh_flush_done_q - finish processed commands or retry them.
1434 * @done_q: list_head of processed commands.
1437 void scsi_eh_flush_done_q(struct list_head *done_q)
1439 struct scsi_cmnd *scmd, *next;
1441 list_for_each_entry_safe(scmd, next, done_q, eh_entry) {
1442 list_del_init(&scmd->eh_entry);
1443 if (scsi_device_online(scmd->device) &&
1444 !blk_noretry_request(scmd->request) &&
1445 (++scmd->retries <= scmd->allowed)) {
1446 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush"
1450 scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY);
1453 * If just we got sense for the device (called
1454 * scsi_eh_get_sense), scmd->result is already
1455 * set, do not set DRIVER_TIMEOUT.
1458 scmd->result |= (DRIVER_TIMEOUT << 24);
1459 SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish"
1461 current->comm, scmd));
1462 scsi_finish_command(scmd);
1466 EXPORT_SYMBOL(scsi_eh_flush_done_q);
1469 * scsi_unjam_host - Attempt to fix a host which has a cmd that failed.
1470 * @shost: Host to unjam.
1473 * When we come in here, we *know* that all commands on the bus have
1474 * either completed, failed or timed out. we also know that no further
1475 * commands are being sent to the host, so things are relatively quiet
1476 * and we have freedom to fiddle with things as we wish.
1478 * This is only the *default* implementation. it is possible for
1479 * individual drivers to supply their own version of this function, and
1480 * if the maintainer wishes to do this, it is strongly suggested that
1481 * this function be taken as a template and modified. this function
1482 * was designed to correctly handle problems for about 95% of the
1483 * different cases out there, and it should always provide at least a
1484 * reasonable amount of error recovery.
1486 * Any command marked 'failed' or 'timeout' must eventually have
1487 * scsi_finish_cmd() called for it. we do all of the retry stuff
1488 * here, so when we restart the host after we return it should have an
1491 static void scsi_unjam_host(struct Scsi_Host *shost)
1493 unsigned long flags;
1494 LIST_HEAD(eh_work_q);
1495 LIST_HEAD(eh_done_q);
1497 spin_lock_irqsave(shost->host_lock, flags);
1498 list_splice_init(&shost->eh_cmd_q, &eh_work_q);
1499 spin_unlock_irqrestore(shost->host_lock, flags);
1501 SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q));
1503 if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q))
1504 if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q))
1505 scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q);
1507 scsi_eh_flush_done_q(&eh_done_q);
1511 * scsi_error_handler - SCSI error handler thread
1512 * @data: Host for which we are running.
1515 * This is the main error handling loop. This is run as a kernel thread
1516 * for every SCSI host and handles all error handling activity.
1518 int scsi_error_handler(void *data)
1520 struct Scsi_Host *shost = data;
1522 current->flags |= PF_NOFREEZE;
1525 * We use TASK_INTERRUPTIBLE so that the thread is not
1526 * counted against the load average as a running process.
1527 * We never actually get interrupted because kthread_run
1528 * disables singal delivery for the created thread.
1530 set_current_state(TASK_INTERRUPTIBLE);
1531 while (!kthread_should_stop()) {
1532 if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) ||
1533 shost->host_failed != shost->host_busy) {
1534 SCSI_LOG_ERROR_RECOVERY(1,
1535 printk("Error handler scsi_eh_%d sleeping\n",
1538 set_current_state(TASK_INTERRUPTIBLE);
1542 __set_current_state(TASK_RUNNING);
1543 SCSI_LOG_ERROR_RECOVERY(1,
1544 printk("Error handler scsi_eh_%d waking up\n",
1548 * We have a host that is failing for some reason. Figure out
1549 * what we need to do to get it up and online again (if we can).
1550 * If we fail, we end up taking the thing offline.
1552 if (shost->transportt->eh_strategy_handler)
1553 shost->transportt->eh_strategy_handler(shost);
1555 scsi_unjam_host(shost);
1558 * Note - if the above fails completely, the action is to take
1559 * individual devices offline and flush the queue of any
1560 * outstanding requests that may have been pending. When we
1561 * restart, we restart any I/O to any other devices on the bus
1562 * which are still online.
1564 scsi_restart_operations(shost);
1565 set_current_state(TASK_INTERRUPTIBLE);
1567 __set_current_state(TASK_RUNNING);
1569 SCSI_LOG_ERROR_RECOVERY(1,
1570 printk("Error handler scsi_eh_%d exiting\n", shost->host_no));
1571 shost->ehandler = NULL;
1576 * Function: scsi_report_bus_reset()
1578 * Purpose: Utility function used by low-level drivers to report that
1579 * they have observed a bus reset on the bus being handled.
1581 * Arguments: shost - Host in question
1582 * channel - channel on which reset was observed.
1586 * Lock status: Host lock must be held.
1588 * Notes: This only needs to be called if the reset is one which
1589 * originates from an unknown location. Resets originated
1590 * by the mid-level itself don't need to call this, but there
1591 * should be no harm.
1593 * The main purpose of this is to make sure that a CHECK_CONDITION
1594 * is properly treated.
1596 void scsi_report_bus_reset(struct Scsi_Host *shost, int channel)
1598 struct scsi_device *sdev;
1600 __shost_for_each_device(sdev, shost) {
1601 if (channel == sdev_channel(sdev)) {
1602 sdev->was_reset = 1;
1603 sdev->expecting_cc_ua = 1;
1607 EXPORT_SYMBOL(scsi_report_bus_reset);
1610 * Function: scsi_report_device_reset()
1612 * Purpose: Utility function used by low-level drivers to report that
1613 * they have observed a device reset on the device being handled.
1615 * Arguments: shost - Host in question
1616 * channel - channel on which reset was observed
1617 * target - target on which reset was observed
1621 * Lock status: Host lock must be held
1623 * Notes: This only needs to be called if the reset is one which
1624 * originates from an unknown location. Resets originated
1625 * by the mid-level itself don't need to call this, but there
1626 * should be no harm.
1628 * The main purpose of this is to make sure that a CHECK_CONDITION
1629 * is properly treated.
1631 void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target)
1633 struct scsi_device *sdev;
1635 __shost_for_each_device(sdev, shost) {
1636 if (channel == sdev_channel(sdev) &&
1637 target == sdev_id(sdev)) {
1638 sdev->was_reset = 1;
1639 sdev->expecting_cc_ua = 1;
1643 EXPORT_SYMBOL(scsi_report_device_reset);
1646 scsi_reset_provider_done_command(struct scsi_cmnd *scmd)
1651 * Function: scsi_reset_provider
1653 * Purpose: Send requested reset to a bus or device at any phase.
1655 * Arguments: device - device to send reset to
1656 * flag - reset type (see scsi.h)
1658 * Returns: SUCCESS/FAILURE.
1660 * Notes: This is used by the SCSI Generic driver to provide
1661 * Bus/Device reset capability.
1664 scsi_reset_provider(struct scsi_device *dev, int flag)
1666 struct scsi_cmnd *scmd = scsi_get_command(dev, GFP_KERNEL);
1667 struct Scsi_Host *shost = dev->host;
1669 unsigned long flags;
1672 scmd->request = &req;
1673 memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout));
1675 memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));
1677 scmd->scsi_done = scsi_reset_provider_done_command;
1679 scmd->request_buffer = NULL;
1680 scmd->request_bufflen = 0;
1684 scmd->sc_data_direction = DMA_BIDIRECTIONAL;
1686 init_timer(&scmd->eh_timeout);
1689 * Sometimes the command can get back into the timer chain,
1690 * so use the pid as an identifier.
1694 spin_lock_irqsave(shost->host_lock, flags);
1695 shost->tmf_in_progress = 1;
1696 spin_unlock_irqrestore(shost->host_lock, flags);
1699 case SCSI_TRY_RESET_DEVICE:
1700 rtn = scsi_try_bus_device_reset(scmd);
1704 case SCSI_TRY_RESET_BUS:
1705 rtn = scsi_try_bus_reset(scmd);
1709 case SCSI_TRY_RESET_HOST:
1710 rtn = scsi_try_host_reset(scmd);
1716 spin_lock_irqsave(shost->host_lock, flags);
1717 shost->tmf_in_progress = 0;
1718 spin_unlock_irqrestore(shost->host_lock, flags);
1721 * be sure to wake up anyone who was sleeping or had their queue
1722 * suspended while we performed the TMF.
1724 SCSI_LOG_ERROR_RECOVERY(3,
1725 printk("%s: waking up host to restart after TMF\n",
1728 wake_up(&shost->host_wait);
1730 scsi_run_host_queues(shost);
1732 scsi_next_command(scmd);
1735 EXPORT_SYMBOL(scsi_reset_provider);
1738 * scsi_normalize_sense - normalize main elements from either fixed or
1739 * descriptor sense data format into a common format.
1741 * @sense_buffer: byte array containing sense data returned by device
1742 * @sb_len: number of valid bytes in sense_buffer
1743 * @sshdr: pointer to instance of structure that common
1744 * elements are written to.
1747 * The "main elements" from sense data are: response_code, sense_key,
1748 * asc, ascq and additional_length (only for descriptor format).
1750 * Typically this function can be called after a device has
1751 * responded to a SCSI command with the CHECK_CONDITION status.
1754 * 1 if valid sense data information found, else 0;
1756 int scsi_normalize_sense(const u8 *sense_buffer, int sb_len,
1757 struct scsi_sense_hdr *sshdr)
1759 if (!sense_buffer || !sb_len)
1762 memset(sshdr, 0, sizeof(struct scsi_sense_hdr));
1764 sshdr->response_code = (sense_buffer[0] & 0x7f);
1766 if (!scsi_sense_valid(sshdr))
1769 if (sshdr->response_code >= 0x72) {
1774 sshdr->sense_key = (sense_buffer[1] & 0xf);
1776 sshdr->asc = sense_buffer[2];
1778 sshdr->ascq = sense_buffer[3];
1780 sshdr->additional_length = sense_buffer[7];
1786 sshdr->sense_key = (sense_buffer[2] & 0xf);
1788 sb_len = (sb_len < (sense_buffer[7] + 8)) ?
1789 sb_len : (sense_buffer[7] + 8);
1791 sshdr->asc = sense_buffer[12];
1793 sshdr->ascq = sense_buffer[13];
1799 EXPORT_SYMBOL(scsi_normalize_sense);
1801 int scsi_command_normalize_sense(struct scsi_cmnd *cmd,
1802 struct scsi_sense_hdr *sshdr)
1804 return scsi_normalize_sense(cmd->sense_buffer,
1805 sizeof(cmd->sense_buffer), sshdr);
1807 EXPORT_SYMBOL(scsi_command_normalize_sense);
1810 * scsi_sense_desc_find - search for a given descriptor type in
1811 * descriptor sense data format.
1813 * @sense_buffer: byte array of descriptor format sense data
1814 * @sb_len: number of valid bytes in sense_buffer
1815 * @desc_type: value of descriptor type to find
1816 * (e.g. 0 -> information)
1819 * only valid when sense data is in descriptor format
1822 * pointer to start of (first) descriptor if found else NULL
1824 const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len,
1827 int add_sen_len, add_len, desc_len, k;
1830 if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7])))
1832 if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73))
1834 add_sen_len = (add_sen_len < (sb_len - 8)) ?
1835 add_sen_len : (sb_len - 8);
1836 descp = &sense_buffer[8];
1837 for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) {
1839 add_len = (k < (add_sen_len - 1)) ? descp[1]: -1;
1840 desc_len = add_len + 2;
1841 if (descp[0] == desc_type)
1843 if (add_len < 0) // short descriptor ??
1848 EXPORT_SYMBOL(scsi_sense_desc_find);
1851 * scsi_get_sense_info_fld - attempts to get information field from
1852 * sense data (either fixed or descriptor format)
1854 * @sense_buffer: byte array of sense data
1855 * @sb_len: number of valid bytes in sense_buffer
1856 * @info_out: pointer to 64 integer where 8 or 4 byte information
1857 * field will be placed if found.
1860 * 1 if information field found, 0 if not found.
1862 int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len,
1871 switch (sense_buffer[0] & 0x7f) {
1874 if (sense_buffer[0] & 0x80) {
1875 *info_out = (sense_buffer[3] << 24) +
1876 (sense_buffer[4] << 16) +
1877 (sense_buffer[5] << 8) + sense_buffer[6];
1883 ucp = scsi_sense_desc_find(sense_buffer, sb_len,
1885 if (ucp && (0xa == ucp[1])) {
1887 for (j = 0; j < 8; ++j) {
1900 EXPORT_SYMBOL(scsi_get_sense_info_fld);