1 // SPDX-License-Identifier: GPL-2.0-only
66 	lockdep_assert_held(shost->host_lock);  in scsi_eh_wakeup()
68 	if (busy == shost->host_failed) {  in scsi_eh_wakeup()
70 		wake_up_process(shost->ehandler);  in scsi_eh_wakeup()
77  * scsi_schedule_eh - schedule EH for SCSI host
86 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_schedule_eh()
90 		shost->host_eh_scheduled++;  in scsi_schedule_eh()
94 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_schedule_eh()
100 	if (!shost->last_reset || shost->eh_deadline == -1)  in scsi_host_eh_past_deadline()
110 	if (time_before(jiffies, shost->last_reset + shost->eh_deadline) &&  in scsi_host_eh_past_deadline()
111 	    shost->eh_deadline > -1)  in scsi_host_eh_past_deadline()
119 	if (cmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT)  in scsi_cmd_retry_allowed()
122 	return ++cmd->retries <= cmd->allowed;  in scsi_cmd_retry_allowed()
127 	struct scsi_device *sdev = cmd->device;  in scsi_eh_should_retry_cmd()
128 	struct Scsi_Host *host = sdev->host;  in scsi_eh_should_retry_cmd()
130 	if (host->hostt->eh_should_retry_cmd)  in scsi_eh_should_retry_cmd()
131 		return  host->hostt->eh_should_retry_cmd(cmd);  in scsi_eh_should_retry_cmd()
137  * scmd_eh_abort_handler - Handle command aborts
151 	struct scsi_device *sdev = scmd->device;  in scmd_eh_abort_handler()
152 	struct Scsi_Host *shost = sdev->host;  in scmd_eh_abort_handler()
166 	rtn = scsi_try_to_abort_cmd(shost->hostt, scmd);  in scmd_eh_abort_handler()
184 	spin_lock_irqsave(shost->host_lock, flags);  in scmd_eh_abort_handler()
185 	list_del_init(&scmd->eh_entry);  in scmd_eh_abort_handler()
189 	 * EH action, clear the ->last_reset time.  in scmd_eh_abort_handler()
191 	if (list_empty(&shost->eh_abort_list) &&  in scmd_eh_abort_handler()
192 	    list_empty(&shost->eh_cmd_q))  in scmd_eh_abort_handler()
193 		if (shost->eh_deadline != -1)  in scmd_eh_abort_handler()
194 			shost->last_reset = 0;  in scmd_eh_abort_handler()
196 	spin_unlock_irqrestore(shost->host_lock, flags);  in scmd_eh_abort_handler()
214 	spin_lock_irqsave(shost->host_lock, flags);  in scmd_eh_abort_handler()
215 	list_del_init(&scmd->eh_entry);  in scmd_eh_abort_handler()
216 	spin_unlock_irqrestore(shost->host_lock, flags);  in scmd_eh_abort_handler()
222  * scsi_abort_command - schedule a command abort
230 	struct scsi_device *sdev = scmd->device;  in scsi_abort_command()
231 	struct Scsi_Host *shost = sdev->host;  in scsi_abort_command()
234 	if (!shost->hostt->eh_abort_handler) {  in scsi_abort_command()
239 	if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) {  in scsi_abort_command()
246 		BUG_ON(delayed_work_pending(&scmd->abort_work));  in scsi_abort_command()
250 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_abort_command()
251 	if (shost->eh_deadline != -1 && !shost->last_reset)  in scsi_abort_command()
252 		shost->last_reset = jiffies;  in scsi_abort_command()
253 	BUG_ON(!list_empty(&scmd->eh_entry));  in scsi_abort_command()
254 	list_add_tail(&scmd->eh_entry, &shost->eh_abort_list);  in scsi_abort_command()
255 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_abort_command()
257 	scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED;  in scsi_abort_command()
260 	queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100);  in scsi_abort_command()
265  * scsi_eh_reset - call into ->eh_action to reset internal counters
276 		if (sdrv->eh_reset)  in scsi_eh_reset()
277 			sdrv->eh_reset(scmd);  in scsi_eh_reset()
284 	struct Scsi_Host *shost = scmd->device->host;  in scsi_eh_inc_host_failed()
288 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_eh_inc_host_failed()
289 	shost->host_failed++;  in scsi_eh_inc_host_failed()
291 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_eh_inc_host_failed()
295  * scsi_eh_scmd_add - add scsi cmd to error handling.
300 	struct Scsi_Host *shost = scmd->device->host;  in scsi_eh_scmd_add()
304 	WARN_ON_ONCE(!shost->ehandler);  in scsi_eh_scmd_add()
305 	WARN_ON_ONCE(!test_bit(SCMD_STATE_INFLIGHT, &scmd->state));  in scsi_eh_scmd_add()
307 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_eh_scmd_add()
312 	if (shost->eh_deadline != -1 && !shost->last_reset)  in scsi_eh_scmd_add()
313 		shost->last_reset = jiffies;  in scsi_eh_scmd_add()
316 	list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q);  in scsi_eh_scmd_add()
317 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_eh_scmd_add()
322 	call_rcu_hurry(&scmd->rcu, scsi_eh_inc_host_failed);  in scsi_eh_scmd_add()
326  * scsi_timeout - Timeout function for normal scsi commands.
338 	struct Scsi_Host *host = scmd->device->host;  in scsi_timeout()
343 	atomic_inc(&scmd->device->iotmo_cnt);  in scsi_timeout()
344 	if (host->eh_deadline != -1 && !host->last_reset)  in scsi_timeout()
345 		host->last_reset = jiffies;  in scsi_timeout()
347 	if (host->hostt->eh_timed_out) {  in scsi_timeout()
348 		switch (host->hostt->eh_timed_out(scmd)) {  in scsi_timeout()
362 	if (test_and_set_bit(SCMD_STATE_COMPLETE, &scmd->state))  in scsi_timeout()
364 	atomic_inc(&scmd->device->iodone_cnt);  in scsi_timeout()
374  * scsi_block_when_processing_errors - Prevent cmds from being queued.
388 	wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host));  in scsi_block_when_processing_errors()
398  * scsi_eh_prt_fail_stats - Log info on failures.
414 			if (scmd->device == sdev) {  in scsi_eh_prt_fail_stats()
416 				if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED)  in scsi_eh_prt_fail_stats()
443  * scsi_report_lun_change - Set flag on all *other* devices on the same target
449 	sdev->sdev_target->expecting_lun_change = 1;  in scsi_report_lun_change()
453  * scsi_report_sense - Examine scsi sense information and log messages for
455  * @sdev:	Device reporting the sense code
463 	if (sshdr->sense_key == UNIT_ATTENTION) {  in scsi_report_sense()
464 		if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) {  in scsi_report_sense()
468 		} else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) {  in scsi_report_sense()
475 		} else if (sshdr->asc == 0x3f)  in scsi_report_sense()
481 		if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) {  in scsi_report_sense()
489 		if (sshdr->asc == 0x29) {  in scsi_report_sense()
492 			 * Do not print message if it is an expected side-effect  in scsi_report_sense()
495 			if (!sdev->silence_suspend)  in scsi_report_sense()
497 					    "Power-on or device reset occurred\n");  in scsi_report_sense()
500 		if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) {  in scsi_report_sense()
504 		} else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) {  in scsi_report_sense()
508 		} else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) {  in scsi_report_sense()
512 		} else if (sshdr->asc == 0x2a)  in scsi_report_sense()
518 		set_bit(evt_type, sdev->pending_events);  in scsi_report_sense()
519 		schedule_work(&sdev->event_work);  in scsi_report_sense()
525 	cmd->result = (cmd->result & 0xffff00ff) | (status << 8);  in set_scsi_ml_byte()
529  * scsi_check_sense - Examine scsi cmd sense
530  * @scmd:	Cmd to have sense checked.
536  *	When a deferred error is detected the current command has
542 	struct scsi_device *sdev = scmd->device;  in scsi_check_sense()
546 		return FAILED;	/* no valid sense data */  in scsi_check_sense()
554 		 * happened, even if someone else gets the sense data.  in scsi_check_sense()
557 			atomic_inc(&sdev->ua_new_media_ctr);  in scsi_check_sense()
559 			atomic_inc(&sdev->ua_por_ctr);  in scsi_check_sense()
565 	if (sdev->handler && sdev->handler->check_sense) {  in scsi_check_sense()
568 		rc = sdev->handler->check_sense(sdev, &sshdr);  in scsi_check_sense()
574 	if (scmd->cmnd[0] == TEST_UNIT_READY &&  in scsi_check_sense()
575 	    scmd->submitter != SUBMITTED_BY_SCSI_ERROR_HANDLER)  in scsi_check_sense()
577 		 * nasty: for mid-layer issued TURs, we need to return the  in scsi_check_sense()
578 		 * actual sense data without any recovery attempt.  For eh  in scsi_check_sense()
589 		if (scmd->sense_buffer[2] & 0xe0)  in scsi_check_sense()
593 		 * descriptor format: look for "stream commands sense data  in scsi_check_sense()
594 		 * descriptor" (see SSC-3). Assume single sense data  in scsi_check_sense()
595 		 * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG.  in scsi_check_sense()
598 		    (scmd->sense_buffer[8] == 0x4) &&  in scsi_check_sense()
599 		    (scmd->sense_buffer[11] & 0xe0))  in scsi_check_sense()
615 		 * ABORTED COMMAND additional sense code with the  in scsi_check_sense()
619 		 * additional sense code qualifiers.  in scsi_check_sense()
624 			req->cmd_flags |= REQ_FAILFAST_DEV;  in scsi_check_sense()
625 			req->rq_flags |= RQF_QUIET;  in scsi_check_sense()
629 		if (sshdr.asc == 0x44 && sdev->sdev_bflags & BLIST_RETRY_ITF)  in scsi_check_sense()
632 		    sdev->sdev_bflags & BLIST_RETRY_ASC_C1)  in scsi_check_sense()
641 		 * information that we should pass up to the upper-level driver  in scsi_check_sense()
644 		if (scmd->device->expecting_cc_ua) {  in scsi_check_sense()
648 			 * additional sense code and qualifier so as  in scsi_check_sense()
652 				scmd->device->expecting_cc_ua = 0;  in scsi_check_sense()
658 		 * reported a UA with an ASC/ASCQ of 3F 0E -  in scsi_check_sense()
661 		if (scmd->device->sdev_target->expecting_lun_change &&  in scsi_check_sense()
675 		if (scmd->device->allow_restart &&  in scsi_check_sense()
709 		if (scmd->device->retry_hwerror)  in scsi_check_sense()
730 		 * and the sense data DATA CURRENTLY UNAVAILABLE, indicating  in scsi_check_sense()
736 			req->cmd_flags |= REQ_FAILFAST_DEV;  in scsi_check_sense()
737 			req->rq_flags |= RQF_QUIET;  in scsi_check_sense()
749 	const struct scsi_host_template *sht = sdev->host->hostt;  in scsi_handle_queue_ramp_up()
752 	if (!sht->track_queue_depth ||  in scsi_handle_queue_ramp_up()
753 	    sdev->queue_depth >= sdev->max_queue_depth)  in scsi_handle_queue_ramp_up()
757 	    sdev->last_queue_ramp_up + sdev->queue_ramp_up_period))  in scsi_handle_queue_ramp_up()
761 	    sdev->last_queue_full_time + sdev->queue_ramp_up_period))  in scsi_handle_queue_ramp_up()
768 	shost_for_each_device(tmp_sdev, sdev->host) {  in scsi_handle_queue_ramp_up()
769 		if (tmp_sdev->channel != sdev->channel ||  in scsi_handle_queue_ramp_up()
770 		    tmp_sdev->id != sdev->id ||  in scsi_handle_queue_ramp_up()
771 		    tmp_sdev->queue_depth == sdev->max_queue_depth)  in scsi_handle_queue_ramp_up()
774 		scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1);  in scsi_handle_queue_ramp_up()
775 		sdev->last_queue_ramp_up = jiffies;  in scsi_handle_queue_ramp_up()
781 	const struct scsi_host_template *sht = sdev->host->hostt;  in scsi_handle_queue_full()
784 	if (!sht->track_queue_depth)  in scsi_handle_queue_full()
787 	shost_for_each_device(tmp_sdev, sdev->host) {  in scsi_handle_queue_full()
788 		if (tmp_sdev->channel != sdev->channel ||  in scsi_handle_queue_full()
789 		    tmp_sdev->id != sdev->id)  in scsi_handle_queue_full()
796 		scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1);  in scsi_handle_queue_full()
801  * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD.
816 	if (host_byte(scmd->result) == DID_RESET) {  in scsi_eh_completed_normally()
819 		 * get to try and figure out what to do next.  if the sense  in scsi_eh_completed_normally()
825 	if (host_byte(scmd->result) != DID_OK)  in scsi_eh_completed_normally()
834 		scsi_handle_queue_ramp_up(scmd->device);  in scsi_eh_completed_normally()
835 		if (scmd->sense_buffer && SCSI_SENSE_VALID(scmd))  in scsi_eh_completed_normally()
837 			 * If we have sense data, call scsi_check_sense() in  in scsi_eh_completed_normally()
856 		if (scmd->cmnd[0] == TEST_UNIT_READY)  in scsi_eh_completed_normally()
863 		scsi_handle_queue_full(scmd->device);  in scsi_eh_completed_normally()
874  * scsi_eh_done - Completion function for error handling.
882 			"%s result: %x\n", __func__, scmd->result));  in scsi_eh_done()
884 	eh_action = scmd->device->host->eh_action;  in scsi_eh_done()
890  * scsi_try_host_reset - ask host adapter to reset itself
897 	struct Scsi_Host *host = scmd->device->host;  in scsi_try_host_reset()
898 	const struct scsi_host_template *hostt = host->hostt;  in scsi_try_host_reset()
903 	if (!hostt->eh_host_reset_handler)  in scsi_try_host_reset()
906 	rtn = hostt->eh_host_reset_handler(scmd);  in scsi_try_host_reset()
909 		if (!hostt->skip_settle_delay)  in scsi_try_host_reset()
911 		spin_lock_irqsave(host->host_lock, flags);  in scsi_try_host_reset()
913 		spin_unlock_irqrestore(host->host_lock, flags);  in scsi_try_host_reset()
920  * scsi_try_bus_reset - ask host to perform a bus reset
927 	struct Scsi_Host *host = scmd->device->host;  in scsi_try_bus_reset()
928 	const struct scsi_host_template *hostt = host->hostt;  in scsi_try_bus_reset()
933 	if (!hostt->eh_bus_reset_handler)  in scsi_try_bus_reset()
936 	rtn = hostt->eh_bus_reset_handler(scmd);  in scsi_try_bus_reset()
939 		if (!hostt->skip_settle_delay)  in scsi_try_bus_reset()
941 		spin_lock_irqsave(host->host_lock, flags);  in scsi_try_bus_reset()
943 		spin_unlock_irqrestore(host->host_lock, flags);  in scsi_try_bus_reset()
951 	sdev->was_reset = 1;  in __scsi_report_device_reset()
952 	sdev->expecting_cc_ua = 1;  in __scsi_report_device_reset()
956  * scsi_try_target_reset - Ask host to perform a target reset
969 	struct Scsi_Host *host = scmd->device->host;  in scsi_try_target_reset()
970 	const struct scsi_host_template *hostt = host->hostt;  in scsi_try_target_reset()
972 	if (!hostt->eh_target_reset_handler)  in scsi_try_target_reset()
975 	rtn = hostt->eh_target_reset_handler(scmd);  in scsi_try_target_reset()
977 		spin_lock_irqsave(host->host_lock, flags);  in scsi_try_target_reset()
978 		__starget_for_each_device(scsi_target(scmd->device), NULL,  in scsi_try_target_reset()
980 		spin_unlock_irqrestore(host->host_lock, flags);  in scsi_try_target_reset()
987  * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev
999 	const struct scsi_host_template *hostt = scmd->device->host->hostt;  in scsi_try_bus_device_reset()
1001 	if (!hostt->eh_device_reset_handler)  in scsi_try_bus_device_reset()
1004 	rtn = hostt->eh_device_reset_handler(scmd);  in scsi_try_bus_device_reset()
1006 		__scsi_report_device_reset(scmd->device, NULL);  in scsi_try_bus_device_reset()
1011  * scsi_try_to_abort_cmd - Ask host to abort a SCSI command
1030 	if (!hostt->eh_abort_handler)  in scsi_try_to_abort_cmd()
1033 	return hostt->eh_abort_handler(scmd);  in scsi_try_to_abort_cmd()
1038 	if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS)  in scsi_abort_eh_cmnd()
1046  * scsi_eh_prep_cmnd  - Save a scsi command info as part of error recovery
1051  * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
1053  * This function is used to save a scsi command information before re-execution
1057  * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer.
1062 	struct scsi_device *sdev = scmd->device;  in scsi_eh_prep_cmnd()
1065 	 * We need saved copies of a number of fields - this is because  in scsi_eh_prep_cmnd()
1071 	ses->cmd_len = scmd->cmd_len;  in scsi_eh_prep_cmnd()
1072 	ses->data_direction = scmd->sc_data_direction;  in scsi_eh_prep_cmnd()
1073 	ses->sdb = scmd->sdb;  in scsi_eh_prep_cmnd()
1074 	ses->result = scmd->result;  in scsi_eh_prep_cmnd()
1075 	ses->resid_len = scmd->resid_len;  in scsi_eh_prep_cmnd()
1076 	ses->underflow = scmd->underflow;  in scsi_eh_prep_cmnd()
1077 	ses->prot_op = scmd->prot_op;  in scsi_eh_prep_cmnd()
1078 	ses->eh_eflags = scmd->eh_eflags;  in scsi_eh_prep_cmnd()
1080 	scmd->prot_op = SCSI_PROT_NORMAL;  in scsi_eh_prep_cmnd()
1081 	scmd->eh_eflags = 0;  in scsi_eh_prep_cmnd()
1082 	memcpy(ses->cmnd, scmd->cmnd, sizeof(ses->cmnd));  in scsi_eh_prep_cmnd()
1083 	memset(scmd->cmnd, 0, sizeof(scmd->cmnd));  in scsi_eh_prep_cmnd()
1084 	memset(&scmd->sdb, 0, sizeof(scmd->sdb));  in scsi_eh_prep_cmnd()
1085 	scmd->result = 0;  in scsi_eh_prep_cmnd()
1086 	scmd->resid_len = 0;  in scsi_eh_prep_cmnd()
1089 		scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE,  in scsi_eh_prep_cmnd()
1091 		sg_init_one(&ses->sense_sgl, scmd->sense_buffer,  in scsi_eh_prep_cmnd()
1092 			    scmd->sdb.length);  in scsi_eh_prep_cmnd()
1093 		scmd->sdb.table.sgl = &ses->sense_sgl;  in scsi_eh_prep_cmnd()
1094 		scmd->sc_data_direction = DMA_FROM_DEVICE;  in scsi_eh_prep_cmnd()
1095 		scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1;  in scsi_eh_prep_cmnd()
1096 		scmd->cmnd[0] = REQUEST_SENSE;  in scsi_eh_prep_cmnd()
1097 		scmd->cmnd[4] = scmd->sdb.length;  in scsi_eh_prep_cmnd()
1098 		scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);  in scsi_eh_prep_cmnd()
1100 		scmd->sc_data_direction = DMA_NONE;  in scsi_eh_prep_cmnd()
1102 			BUG_ON(cmnd_size > sizeof(scmd->cmnd));  in scsi_eh_prep_cmnd()
1103 			memcpy(scmd->cmnd, cmnd, cmnd_size);  in scsi_eh_prep_cmnd()
1104 			scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);  in scsi_eh_prep_cmnd()
1108 	scmd->underflow = 0;  in scsi_eh_prep_cmnd()
1110 	if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN)  in scsi_eh_prep_cmnd()
1111 		scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |  in scsi_eh_prep_cmnd()
1112 			(sdev->lun << 5 & 0xe0);  in scsi_eh_prep_cmnd()
1115 	 * Zero the sense buffer.  The scsi spec mandates that any  in scsi_eh_prep_cmnd()
1116 	 * untransferred sense data should be interpreted as being zero.  in scsi_eh_prep_cmnd()
1118 	memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);  in scsi_eh_prep_cmnd()
1123  * scsi_eh_restore_cmnd  - Restore a scsi command info as part of error recovery
1134 	scmd->cmd_len = ses->cmd_len;  in scsi_eh_restore_cmnd()
1135 	memcpy(scmd->cmnd, ses->cmnd, sizeof(ses->cmnd));  in scsi_eh_restore_cmnd()
1136 	scmd->sc_data_direction = ses->data_direction;  in scsi_eh_restore_cmnd()
1137 	scmd->sdb = ses->sdb;  in scsi_eh_restore_cmnd()
1138 	scmd->result = ses->result;  in scsi_eh_restore_cmnd()
1139 	scmd->resid_len = ses->resid_len;  in scsi_eh_restore_cmnd()
1140 	scmd->underflow = ses->underflow;  in scsi_eh_restore_cmnd()
1141 	scmd->prot_op = ses->prot_op;  in scsi_eh_restore_cmnd()
1142 	scmd->eh_eflags = ses->eh_eflags;  in scsi_eh_restore_cmnd()
1147  * scsi_send_eh_cmnd  - submit a scsi command as part of error recovery
1152  * @sense_bytes: size of sense data to copy or 0
1163 	struct scsi_device *sdev = scmd->device;  in scsi_send_eh_cmnd()
1164 	struct Scsi_Host *shost = sdev->host;  in scsi_send_eh_cmnd()
1173 	shost->eh_action = &done;  in scsi_send_eh_cmnd()
1176 	scmd->submitter = SUBMITTED_BY_SCSI_ERROR_HANDLER;  in scsi_send_eh_cmnd()
1177 	scmd->flags |= SCMD_LAST;  in scsi_send_eh_cmnd()
1180 	 * Lock sdev->state_mutex to avoid that scsi_device_quiesce() can  in scsi_send_eh_cmnd()
1184 	mutex_lock(&sdev->state_mutex);  in scsi_send_eh_cmnd()
1185 	while (sdev->sdev_state == SDEV_BLOCK && timeleft > 0) {  in scsi_send_eh_cmnd()
1186 		mutex_unlock(&sdev->state_mutex);  in scsi_send_eh_cmnd()
1188 			"%s: state %d <> %d\n", __func__, sdev->sdev_state,  in scsi_send_eh_cmnd()
1191 		timeleft -= delay;  in scsi_send_eh_cmnd()
1193 		mutex_lock(&sdev->state_mutex);  in scsi_send_eh_cmnd()
1195 	if (sdev->sdev_state != SDEV_BLOCK)  in scsi_send_eh_cmnd()
1196 		rtn = shost->hostt->queuecommand(shost, scmd);  in scsi_send_eh_cmnd()
1199 	mutex_unlock(&sdev->state_mutex);  in scsi_send_eh_cmnd()
1205 			timeleft -= stall_for;  in scsi_send_eh_cmnd()
1217 	shost->eh_action = NULL;  in scsi_send_eh_cmnd()
1231 	 * ->queuecommand() kept returning non zero, use the rtn = FAILED  in scsi_send_eh_cmnd()
1262  * scsi_request_sense - Request sense data from a particular target.
1263  * @scmd:	SCSI cmd for request sense.
1272 	return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0);  in scsi_request_sense()
1280 		if (sdrv->eh_action)  in scsi_eh_action()
1281 			rtn = sdrv->eh_action(scmd, rtn);  in scsi_eh_action()
1287  * scsi_eh_finish_cmd - Handle a cmd that eh is finished with.
1293  *    still handling errors - it may cause other commands to be queued,
1300 	list_move_tail(&scmd->eh_entry, done_q);  in scsi_eh_finish_cmd()
1305  * scsi_eh_get_sense - Get device sense data.
1310  *    See if we need to request sense information.  if so, then get it
1315  *    not automatically request sense information, we end up shutting
1318  *    All drivers should request sense information internally these days,
1333 	 * should not get sense.  in scsi_eh_get_sense()
1336 		if ((scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) ||  in scsi_eh_get_sense()
1340 		shost = scmd->device->host;  in scsi_eh_get_sense()
1344 					    "%s: skip request sense, past eh deadline\n",  in scsi_eh_get_sense()
1345 					     current->comm));  in scsi_eh_get_sense()
1348 		if (!scsi_status_is_check_condition(scmd->result))  in scsi_eh_get_sense()
1350 			 * don't request sense if there's no check condition  in scsi_eh_get_sense()
1352 			 * that has a sense code (and some devices get  in scsi_eh_get_sense()
1353 			 * confused by sense requests out of the blue)  in scsi_eh_get_sense()
1358 						  "%s: requesting sense\n",  in scsi_eh_get_sense()
1359 						  current->comm));  in scsi_eh_get_sense()
1365 			"sense requested, result %x\n", scmd->result));  in scsi_eh_get_sense()
1377 			 * with the sense data, so set retries to the max  in scsi_eh_get_sense()
1383 			if (scmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT)  in scsi_eh_get_sense()
1384 				scmd->retries = scmd->allowed = 1;  in scsi_eh_get_sense()
1386 				scmd->retries = scmd->allowed;  in scsi_eh_get_sense()
1398  * scsi_eh_tur - Send TUR to device.
1402  *    0 - Device is ready. 1 - Device NOT ready.
1412 				scmd->device->eh_timeout, 0);  in scsi_eh_tur()
1419 		if (retry_cnt--)  in scsi_eh_tur()
1430  * scsi_eh_test_devices - check if devices are responding from error recovery.
1451 		scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry);  in scsi_eh_test_devices()
1452 		sdev = scmd->device;  in scsi_eh_test_devices()
1455 			if (scsi_host_eh_past_deadline(sdev->host)) {  in scsi_eh_test_devices()
1461 						    current->comm));  in scsi_eh_test_devices()
1466 		finish_cmds = !scsi_device_online(scmd->device) ||  in scsi_eh_test_devices()
1472 			if (scmd->device == sdev) {  in scsi_eh_test_devices()
1478 					list_move_tail(&scmd->eh_entry, work_q);  in scsi_eh_test_devices()
1485  * scsi_eh_try_stu - Send START_UNIT to device.
1489  *    0 - Device is ready. 1 - Device NOT ready.
1495 	if (scmd->device->allow_restart) {  in scsi_eh_try_stu()
1501 						scmd->device->eh_timeout, 0);  in scsi_eh_try_stu()
1511  * scsi_eh_stu - send START_UNIT if needed
1532 					    current->comm));  in scsi_eh_stu()
1538 			if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) &&  in scsi_eh_stu()
1550 				    current->comm));  in scsi_eh_stu()
1557 					if (scmd->device == sdev &&  in scsi_eh_stu()
1566 					    current->comm));  in scsi_eh_stu()
1575  * scsi_eh_bus_device_reset - send bdr if needed
1582  *    devices that are jammed or not - if we have multiple devices, it
1583  *    makes no sense to try bus_device_reset - we really would need to try
1599 					     current->comm));  in scsi_eh_bus_device_reset()
1605 			if (scmd->device == sdev) {  in scsi_eh_bus_device_reset()
1615 				     "%s: Sending BDR\n", current->comm));  in scsi_eh_bus_device_reset()
1623 					if (scmd->device == sdev &&  in scsi_eh_bus_device_reset()
1632 					    "%s: BDR failed\n", current->comm));  in scsi_eh_bus_device_reset()
1640  * scsi_eh_target_reset - send target reset if needed
1669 					     current->comm));  in scsi_eh_target_reset()
1679 				     current->comm, id));  in scsi_eh_target_reset()
1686 					     current->comm, id));  in scsi_eh_target_reset()
1692 				list_move_tail(&scmd->eh_entry, &check_list);  in scsi_eh_target_reset()
1697 				list_move(&scmd->eh_entry, work_q);  in scsi_eh_target_reset()
1705  * scsi_eh_bus_reset - send a bus reset
1726 	for (channel = 0; channel <= shost->max_channel; channel++) {  in scsi_eh_bus_reset()
1732 					     current->comm));  in scsi_eh_bus_reset()
1753 				     current->comm, channel));  in scsi_eh_bus_reset()
1762 						list_move_tail(&scmd->eh_entry,  in scsi_eh_bus_reset()
1770 					     current->comm, channel));  in scsi_eh_bus_reset()
1777  * scsi_eh_host_reset - send a host reset
1791 		scmd = list_entry(work_q->next,  in scsi_eh_host_reset()
1797 				     current->comm));  in scsi_eh_host_reset()
1810 					     current->comm));  in scsi_eh_host_reset()
1817  * scsi_eh_offline_sdevs - offline scsi devices that fail to recover
1828 		sdev_printk(KERN_INFO, scmd->device, "Device offlined - "  in scsi_eh_offline_sdevs()
1830 		sdev = scmd->device;  in scsi_eh_offline_sdevs()
1832 		mutex_lock(&sdev->state_mutex);  in scsi_eh_offline_sdevs()
1834 		mutex_unlock(&sdev->state_mutex);  in scsi_eh_offline_sdevs()
1842  * scsi_noretry_cmd - determine if command should be failed fast
1849 	switch (host_byte(scmd->result)) {  in scsi_noretry_cmd()
1855 		return !!(req->cmd_flags & REQ_FAILFAST_TRANSPORT);  in scsi_noretry_cmd()
1857 		return !!(req->cmd_flags & REQ_FAILFAST_DEV);  in scsi_noretry_cmd()
1863 		return !!(req->cmd_flags & REQ_FAILFAST_DRIVER);  in scsi_noretry_cmd()
1867 	if (scsi_ml_byte(scmd->result) == SCSIML_STAT_DL_TIMEOUT)  in scsi_noretry_cmd()
1870 	if (!scsi_status_is_check_condition(scmd->result))  in scsi_noretry_cmd()
1875 	 * assume caller has checked sense and determined  in scsi_noretry_cmd()
1878 	if (req->cmd_flags & REQ_FAILFAST_DEV || blk_rq_is_passthrough(req))  in scsi_noretry_cmd()
1885  * scsi_decide_disposition - Disposition a cmd on return from LLD.
1906 	if (!scsi_device_online(scmd->device)) {  in scsi_decide_disposition()
1908 			"%s: device offline - report as SUCCESS\n", __func__));  in scsi_decide_disposition()
1916 	switch (host_byte(scmd->result)) {  in scsi_decide_disposition()
1923 		scmd->result &= 0xff00ffff;  in scsi_decide_disposition()
1931 		if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) {  in scsi_decide_disposition()
1939 		 * note - this means that we just report the status back  in scsi_decide_disposition()
1994 		if ((scmd->cmnd[0] == TEST_UNIT_READY ||  in scsi_decide_disposition()
1995 		     scmd->cmnd[0] == INQUIRY)) {  in scsi_decide_disposition()
2011 		scsi_handle_queue_full(scmd->device);  in scsi_decide_disposition()
2020 		 * occur (SAM-3) when the task queue is empty, so will cause  in scsi_decide_disposition()
2026 		if (scmd->cmnd[0] == REPORT_LUNS)  in scsi_decide_disposition()
2027 			scmd->device->sdev_target->expecting_lun_change = 0;  in scsi_decide_disposition()
2028 		scsi_handle_queue_ramp_up(scmd->device);  in scsi_decide_disposition()
2029 		if (scmd->sense_buffer && SCSI_SENSE_VALID(scmd))  in scsi_decide_disposition()
2031 			 * If we have sense data, call scsi_check_sense() in  in scsi_decide_disposition()
2046 		/* if rtn == FAILED, we have no sense information;  in scsi_decide_disposition()
2048 		 * to collect the sense and redo the decide  in scsi_decide_disposition()
2061 		sdev_printk(KERN_INFO, scmd->device,  in scsi_decide_disposition()
2078 		 * no more retries - report this one back to upper level.  in scsi_decide_disposition()
2092  * scsi_eh_lock_door - Prevent medium removal for the specified device
2107 	req = scsi_alloc_request(sdev->request_queue, REQ_OP_DRV_IN, 0);  in scsi_eh_lock_door()
2112 	scmd->cmnd[0] = ALLOW_MEDIUM_REMOVAL;  in scsi_eh_lock_door()
2113 	scmd->cmnd[1] = 0;  in scsi_eh_lock_door()
2114 	scmd->cmnd[2] = 0;  in scsi_eh_lock_door()
2115 	scmd->cmnd[3] = 0;  in scsi_eh_lock_door()
2116 	scmd->cmnd[4] = SCSI_REMOVAL_PREVENT;  in scsi_eh_lock_door()
2117 	scmd->cmnd[5] = 0;  in scsi_eh_lock_door()
2118 	scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);  in scsi_eh_lock_door()
2119 	scmd->allowed = 5;  in scsi_eh_lock_door()
2121 	req->rq_flags |= RQF_QUIET;  in scsi_eh_lock_door()
2122 	req->timeout = 10 * HZ;  in scsi_eh_lock_door()
2123 	req->end_io = eh_lock_door_done;  in scsi_eh_lock_door()
2129  * scsi_restart_operations - restart io operations to the specified host.
2144 	 * is no point trying to lock the door of an off-line device.  in scsi_restart_operations()
2147 		if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) {  in scsi_restart_operations()
2149 			sdev->was_reset = 0;  in scsi_restart_operations()
2161 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_restart_operations()
2165 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_restart_operations()
2167 	wake_up(&shost->host_wait);  in scsi_restart_operations()
2170 	 * finally we need to re-initiate requests that may be pending.  we will  in scsi_restart_operations()
2178 	 * if eh is active and host_eh_scheduled is pending we need to re-run  in scsi_restart_operations()
2181 	 * progress before we sync again.  Either we'll immediately re-run  in scsi_restart_operations()
2185 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_restart_operations()
2186 	if (shost->host_eh_scheduled)  in scsi_restart_operations()
2189 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_restart_operations()
2193  * scsi_eh_ready_devs - check device ready state and recover if not.
2213  * scsi_eh_flush_done_q - finish processed commands or retry them.
2221 		struct scsi_device *sdev = scmd->device;  in scsi_eh_flush_done_q()
2223 		list_del_init(&scmd->eh_entry);  in scsi_eh_flush_done_q()
2230 					     current->comm));  in scsi_eh_flush_done_q()
2232 				blk_mq_kick_requeue_list(sdev->request_queue);  in scsi_eh_flush_done_q()
2235 			 * If just we got sense for the device (called  in scsi_eh_flush_done_q()
2236 			 * scsi_eh_get_sense), scmd->result is already  in scsi_eh_flush_done_q()
2239 			if (!scmd->result &&  in scsi_eh_flush_done_q()
2240 			    !(scmd->flags & SCMD_FORCE_EH_SUCCESS))  in scsi_eh_flush_done_q()
2241 				scmd->result |= (DID_TIME_OUT << 16);  in scsi_eh_flush_done_q()
2245 					     current->comm));  in scsi_eh_flush_done_q()
2253  * scsi_unjam_host - Attempt to fix a host which has a cmd that failed.
2281 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_unjam_host()
2282 	list_splice_init(&shost->eh_cmd_q, &eh_work_q);  in scsi_unjam_host()
2283 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_unjam_host()
2290 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_unjam_host()
2291 	if (shost->eh_deadline != -1)  in scsi_unjam_host()
2292 		shost->last_reset = 0;  in scsi_unjam_host()
2293 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_unjam_host()
2298  * scsi_error_handler - SCSI error handler thread
2326 		if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) ||  in scsi_error_handler()
2327 		    shost->host_failed != scsi_host_busy(shost)) {  in scsi_error_handler()
2331 					     shost->host_no));  in scsi_error_handler()
2340 				     shost->host_no, shost->host_eh_scheduled,  in scsi_error_handler()
2341 				     shost->host_failed,  in scsi_error_handler()
2349 		if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) {  in scsi_error_handler()
2353 					     shost->host_no));  in scsi_error_handler()
2357 		if (shost->transportt->eh_strategy_handler)  in scsi_error_handler()
2358 			shost->transportt->eh_strategy_handler(shost);  in scsi_error_handler()
2363 		shost->host_failed = 0;  in scsi_error_handler()
2366 		 * Note - if the above fails completely, the action is to take  in scsi_error_handler()
2373 		if (!shost->eh_noresume)  in scsi_error_handler()
2381 			     shost->host_no));  in scsi_error_handler()
2382 	shost->ehandler = NULL;  in scsi_error_handler()
2387  * scsi_report_bus_reset() - report bus reset observed
2389  * Utility function used by low-level drivers to report that
2401  *		by the mid-level itself don't need to call this, but there
2419  * scsi_report_device_reset() - report device reset observed
2421  * Utility function used by low-level drivers to report that
2434  *		by the mid-level itself don't need to call this, but there
2461 	struct Scsi_Host *shost = dev->host;  in scsi_ioctl_reset()
2468 		return -EACCES;  in scsi_ioctl_reset()
2475 		return -EIO;  in scsi_ioctl_reset()
2477 	error = -EIO;  in scsi_ioctl_reset()
2479 			shost->hostt->cmd_size, GFP_KERNEL);  in scsi_ioctl_reset()
2487 	scmd->submitter = SUBMITTED_BY_SCSI_RESET_IOCTL;  in scsi_ioctl_reset()
2488 	scmd->flags |= SCMD_LAST;  in scsi_ioctl_reset()
2489 	memset(&scmd->sdb, 0, sizeof(scmd->sdb));  in scsi_ioctl_reset()
2491 	scmd->cmd_len			= 0;  in scsi_ioctl_reset()
2493 	scmd->sc_data_direction		= DMA_BIDIRECTIONAL;  in scsi_ioctl_reset()
2495 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_ioctl_reset()
2496 	shost->tmf_in_progress = 1;  in scsi_ioctl_reset()
2497 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_ioctl_reset()
2528 	error = (rtn == SUCCESS) ? 0 : -EIO;  in scsi_ioctl_reset()
2530 	spin_lock_irqsave(shost->host_lock, flags);  in scsi_ioctl_reset()
2531 	shost->tmf_in_progress = 0;  in scsi_ioctl_reset()
2532 	spin_unlock_irqrestore(shost->host_lock, flags);  in scsi_ioctl_reset()
2542 	wake_up(&shost->host_wait);  in scsi_ioctl_reset()
2555 	return scsi_normalize_sense(cmd->sense_buffer,  in scsi_command_normalize_sense()
2561 …* scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor form…
2562  * @sense_buffer:	byte array of sense data