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drivers/scsi/scsi_error.c
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/* * scsi_error.c Copyright (C) 1997 Eric Youngdale * * SCSI error/timeout handling * Initial versions: Eric Youngdale. Based upon conversations with |
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* Leonard Zubkoff and David Miller at Linux Expo, |
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* ideas originating from all over the place. * * Restructured scsi_unjam_host and associated functions. * September 04, 2002 Mike Anderson (andmike@us.ibm.com) * * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and |
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* minor cleanups. |
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* September 30, 2002 Mike Anderson (andmike@us.ibm.com) */ #include <linux/module.h> #include <linux/sched.h> |
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#include <linux/gfp.h> |
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#include <linux/timer.h> #include <linux/string.h> |
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#include <linux/kernel.h> |
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#include <linux/freezer.h> |
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#include <linux/kthread.h> |
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#include <linux/interrupt.h> #include <linux/blkdev.h> #include <linux/delay.h> |
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#include <linux/jiffies.h> |
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#include <scsi/scsi.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_dbg.h> #include <scsi/scsi_device.h> |
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#include <scsi/scsi_driver.h> |
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#include <scsi/scsi_eh.h> |
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#include <scsi/scsi_transport.h> |
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#include <scsi/scsi_host.h> #include <scsi/scsi_ioctl.h> |
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#include "scsi_priv.h" #include "scsi_logging.h" |
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#include "scsi_transport_api.h" |
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|
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#include <trace/events/scsi.h> |
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static void scsi_eh_done(struct scsi_cmnd *scmd); |
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/* * These should *probably* be handled by the host itself. * Since it is allowed to sleep, it probably should. */ #define BUS_RESET_SETTLE_TIME (10) #define HOST_RESET_SETTLE_TIME (10) |
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static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
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static int scsi_try_to_abort_cmd(struct scsi_host_template *, struct scsi_cmnd *); |
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|
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/* called with shost->host_lock held */ void scsi_eh_wakeup(struct Scsi_Host *shost) { |
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if (atomic_read(&shost->host_busy) == shost->host_failed) { |
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trace_scsi_eh_wakeup(shost); |
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wake_up_process(shost->ehandler); |
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SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost, "Waking error handler thread ")); |
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} } |
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/** * scsi_schedule_eh - schedule EH for SCSI host * @shost: SCSI host to invoke error handling on. * * Schedule SCSI EH without scmd. |
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*/ |
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void scsi_schedule_eh(struct Scsi_Host *shost) { unsigned long flags; spin_lock_irqsave(shost->host_lock, flags); if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { shost->host_eh_scheduled++; scsi_eh_wakeup(shost); } spin_unlock_irqrestore(shost->host_lock, flags); } EXPORT_SYMBOL_GPL(scsi_schedule_eh); |
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|
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static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) { |
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if (!shost->last_reset || shost->eh_deadline == -1) |
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return 0; |
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/* * 32bit accesses are guaranteed to be atomic * (on all supported architectures), so instead * of using a spinlock we can as well double check |
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* if eh_deadline has been set to 'off' during the |
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* time_before call. */ if (time_before(jiffies, shost->last_reset + shost->eh_deadline) && |
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shost->eh_deadline > -1) |
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return 0; return 1; } |
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/** |
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* scmd_eh_abort_handler - Handle command aborts * @work: command to be aborted. */ void scmd_eh_abort_handler(struct work_struct *work) { struct scsi_cmnd *scmd = container_of(work, struct scsi_cmnd, abort_work.work); struct scsi_device *sdev = scmd->device; |
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int rtn; |
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if (scsi_host_eh_past_deadline(sdev->host)) { |
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SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "scmd %p eh timeout, not aborting ", scmd)); } else { |
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SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "aborting command %p ", scmd)); rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); if (rtn == SUCCESS) { |
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set_host_byte(scmd, DID_TIME_OUT); |
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if (scsi_host_eh_past_deadline(sdev->host)) { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "scmd %p eh timeout, " "not retrying aborted " "command ", scmd)); } else if (!scsi_noretry_cmd(scmd) && |
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(++scmd->retries <= scmd->allowed)) { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_WARNING, scmd, "scmd %p retry " "aborted command ", scmd)); scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
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return; |
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} else { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_WARNING, scmd, "scmd %p finish " "aborted command ", scmd)); scsi_finish_command(scmd); |
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return; |
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} |
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} else { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "scmd %p abort failed, rtn %d ", scmd, rtn)); |
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} |
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} if (!scsi_eh_scmd_add(scmd, 0)) { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_WARNING, scmd, "scmd %p terminate " "aborted command ", scmd)); |
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set_host_byte(scmd, DID_TIME_OUT); |
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scsi_finish_command(scmd); } } /** * scsi_abort_command - schedule a command abort * @scmd: scmd to abort. * * We only need to abort commands after a command timeout */ static int scsi_abort_command(struct scsi_cmnd *scmd) { struct scsi_device *sdev = scmd->device; struct Scsi_Host *shost = sdev->host; unsigned long flags; if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { /* * Retry after abort failed, escalate to next level. */ |
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scmd->eh_eflags &= ~SCSI_EH_ABORT_SCHEDULED; |
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SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "scmd %p previous abort failed ", scmd)); |
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BUG_ON(delayed_work_pending(&scmd->abort_work)); |
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return FAILED; } /* * Do not try a command abort if * SCSI EH has already started. */ spin_lock_irqsave(shost->host_lock, flags); if (scsi_host_in_recovery(shost)) { spin_unlock_irqrestore(shost->host_lock, flags); SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "scmd %p not aborting, host in recovery ", scmd)); return FAILED; } |
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if (shost->eh_deadline != -1 && !shost->last_reset) |
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shost->last_reset = jiffies; spin_unlock_irqrestore(shost->host_lock, flags); scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "scmd %p abort scheduled ", scmd)); queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); return SUCCESS; } /** |
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* scsi_eh_scmd_add - add scsi cmd to error handling. * @scmd: scmd to run eh on. * @eh_flag: optional SCSI_EH flag. * * Return value: * 0 on failure. |
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*/ |
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int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) { struct Scsi_Host *shost = scmd->device->host; unsigned long flags; |
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int ret = 0; |
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|
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if (!shost->ehandler) |
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return 0; spin_lock_irqsave(shost->host_lock, flags); |
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if (scsi_host_set_state(shost, SHOST_RECOVERY)) if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) goto out_unlock; |
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|
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if (shost->eh_deadline != -1 && !shost->last_reset) |
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shost->last_reset = jiffies; |
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ret = 1; |
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if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) eh_flag &= ~SCSI_EH_CANCEL_CMD; |
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scmd->eh_eflags |= eh_flag; |
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list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
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shost->host_failed++; scsi_eh_wakeup(shost); |
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out_unlock: |
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spin_unlock_irqrestore(shost->host_lock, flags); |
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return ret; |
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} /** |
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* scsi_times_out - Timeout function for normal scsi commands. |
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* @req: request that is timing out. |
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* * Notes: * We do not need to lock this. There is the potential for a race * only in that the normal completion handling might run, but if the * normal completion function determines that the timer has already * fired, then it mustn't do anything. |
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*/ |
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enum blk_eh_timer_return scsi_times_out(struct request *req) |
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{ |
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struct scsi_cmnd *scmd = req->special; |
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enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
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struct Scsi_Host *host = scmd->device->host; |
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|
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trace_scsi_dispatch_cmd_timeout(scmd); |
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scsi_log_completion(scmd, TIMEOUT_ERROR); |
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if (host->eh_deadline != -1 && !host->last_reset) |
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host->last_reset = jiffies; |
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if (host->transportt->eh_timed_out) rtn = host->transportt->eh_timed_out(scmd); else if (host->hostt->eh_timed_out) rtn = host->hostt->eh_timed_out(scmd); |
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|
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if (rtn == BLK_EH_NOT_HANDLED) { if (!host->hostt->no_async_abort && scsi_abort_command(scmd) == SUCCESS) |
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return BLK_EH_NOT_HANDLED; |
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set_host_byte(scmd, DID_TIME_OUT); if (!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)) rtn = BLK_EH_HANDLED; } |
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|
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return rtn; |
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} /** * scsi_block_when_processing_errors - Prevent cmds from being queued. * @sdev: Device on which we are performing recovery. * * Description: * We block until the host is out of error recovery, and then check to * see whether the host or the device is offline. * * Return value: * 0 when dev was taken offline by error recovery. 1 OK to proceed. |
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*/ |
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int scsi_block_when_processing_errors(struct scsi_device *sdev) { int online; |
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wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
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online = scsi_device_online(sdev); |
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SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev, "%s: rtn: %d ", __func__, online)); |
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return online; } EXPORT_SYMBOL(scsi_block_when_processing_errors); #ifdef CONFIG_SCSI_LOGGING /** * scsi_eh_prt_fail_stats - Log info on failures. * @shost: scsi host being recovered. * @work_q: Queue of scsi cmds to process. |
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*/ |
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static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, struct list_head *work_q) { struct scsi_cmnd *scmd; struct scsi_device *sdev; int total_failures = 0; int cmd_failed = 0; int cmd_cancel = 0; int devices_failed = 0; shost_for_each_device(sdev, shost) { list_for_each_entry(scmd, work_q, eh_entry) { if (scmd->device == sdev) { ++total_failures; |
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if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
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++cmd_cancel; |
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else |
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++cmd_failed; } } if (cmd_cancel || cmd_failed) { SCSI_LOG_ERROR_RECOVERY(3, |
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sdev_printk(KERN_INFO, sdev, "%s: cmds failed: %d, cancel: %d ", |
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__func__, cmd_failed, |
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cmd_cancel)); |
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cmd_cancel = 0; cmd_failed = 0; ++devices_failed; } } |
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SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, "Total of %d commands on %d" " devices require eh work ", |
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total_failures, devices_failed)); |
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} #endif |
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/** * scsi_report_lun_change - Set flag on all *other* devices on the same target * to indicate that a UNIT ATTENTION is expected. * @sdev: Device reporting the UNIT ATTENTION */ static void scsi_report_lun_change(struct scsi_device *sdev) { sdev->sdev_target->expecting_lun_change = 1; } /** * scsi_report_sense - Examine scsi sense information and log messages for * certain conditions, also issue uevents for some of them. * @sdev: Device reporting the sense code * @sshdr: sshdr to be examined */ static void scsi_report_sense(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) { enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ if (sshdr->sense_key == UNIT_ATTENTION) { if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; sdev_printk(KERN_WARNING, sdev, "Inquiry data has changed"); } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; scsi_report_lun_change(sdev); sdev_printk(KERN_WARNING, sdev, "Warning! Received an indication that the " "LUN assignments on this target have " "changed. The Linux SCSI layer does not " "automatically remap LUN assignments. "); } else if (sshdr->asc == 0x3f) sdev_printk(KERN_WARNING, sdev, "Warning! Received an indication that the " "operating parameters on this target have " "changed. The Linux SCSI layer does not " "automatically adjust these parameters. "); if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; sdev_printk(KERN_WARNING, sdev, "Warning! Received an indication that the " "LUN reached a thin provisioning soft " "threshold. "); } if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; sdev_printk(KERN_WARNING, sdev, "Mode parameters changed"); } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; sdev_printk(KERN_WARNING, sdev, "Capacity data has changed"); } else if (sshdr->asc == 0x2a) sdev_printk(KERN_WARNING, sdev, "Parameters changed"); } if (evt_type != SDEV_EVT_MAXBITS) { set_bit(evt_type, sdev->pending_events); schedule_work(&sdev->event_work); } } |
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/** * scsi_check_sense - Examine scsi cmd sense * @scmd: Cmd to have sense checked. * * Return value: |
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* SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
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* * Notes: * When a deferred error is detected the current command has * not been executed and needs retrying. |
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*/ |
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static int scsi_check_sense(struct scsi_cmnd *scmd) { |
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struct scsi_device *sdev = scmd->device; |
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struct scsi_sense_hdr sshdr; if (! scsi_command_normalize_sense(scmd, &sshdr)) return FAILED; /* no valid sense data */ |
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scsi_report_sense(sdev, &sshdr); |
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if (scsi_sense_is_deferred(&sshdr)) return NEEDS_RETRY; |
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465 466 467 468 469 470 471 472 473 |
if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && sdev->scsi_dh_data->scsi_dh->check_sense) { int rc; rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); if (rc != SCSI_RETURN_NOT_HANDLED) return rc; /* handler does not care. Drop down to default handling */ } |
e925cc431 scsi: call device... |
474 475 476 477 478 479 480 |
if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) /* * nasty: for mid-layer issued TURs, we need to return the * actual sense data without any recovery attempt. For eh * issued ones, we need to try to recover and interpret */ return SUCCESS; |
1da177e4c Linux-2.6.12-rc2 |
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 |
/* * Previous logic looked for FILEMARK, EOM or ILI which are * mainly associated with tapes and returned SUCCESS. */ if (sshdr.response_code == 0x70) { /* fixed format */ if (scmd->sense_buffer[2] & 0xe0) return SUCCESS; } else { /* * descriptor format: look for "stream commands sense data * descriptor" (see SSC-3). Assume single sense data * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. */ if ((sshdr.additional_length > 3) && (scmd->sense_buffer[8] == 0x4) && (scmd->sense_buffer[11] & 0xe0)) return SUCCESS; } switch (sshdr.sense_key) { case NO_SENSE: return SUCCESS; case RECOVERED_ERROR: return /* soft_error */ SUCCESS; case ABORTED_COMMAND: |
511e44f42 [SCSI] Do not ret... |
508 509 |
if (sshdr.asc == 0x10) /* DIF */ return SUCCESS; |
1da177e4c Linux-2.6.12-rc2 |
510 511 512 513 514 515 516 517 518 519 |
return NEEDS_RETRY; case NOT_READY: case UNIT_ATTENTION: /* * if we are expecting a cc/ua because of a bus reset that we * performed, treat this just as a retry. otherwise this is * information that we should pass up to the upper-level driver * so that we can deal with it there. */ if (scmd->device->expecting_cc_ua) { |
dfcf77758 [SCSI] Fix out of... |
520 521 522 523 524 525 526 527 528 529 |
/* * Because some device does not queue unit * attentions correctly, we carefully check * additional sense code and qualifier so as * not to squash media change unit attention. */ if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { scmd->device->expecting_cc_ua = 0; return NEEDS_RETRY; } |
1da177e4c Linux-2.6.12-rc2 |
530 531 |
} /* |
279afdfe7 [SCSI] Generate u... |
532 533 534 535 536 537 538 539 |
* we might also expect a cc/ua if another LUN on the target * reported a UA with an ASC/ASCQ of 3F 0E - * REPORTED LUNS DATA HAS CHANGED. */ if (scmd->device->sdev_target->expecting_lun_change && sshdr.asc == 0x3f && sshdr.ascq == 0x0e) return NEEDS_RETRY; /* |
0bf8c8697 Reduce sequential... |
540 |
* if the device is in the process of becoming ready, we |
1da177e4c Linux-2.6.12-rc2 |
541 542 543 544 545 546 547 548 549 550 551 |
* should retry. */ if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) return NEEDS_RETRY; /* * if the device is not started, we need to wake * the error handler to start the motor */ if (scmd->device->allow_restart && (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) return FAILED; |
02e031cbc block: remove REQ... |
552 553 554 555 556 |
/* * Pass the UA upwards for a determination in the completion * functions. */ return SUCCESS; |
1da177e4c Linux-2.6.12-rc2 |
557 |
|
63583cca7 [SCSI] Add detail... |
558 |
/* these are not supported */ |
a9d6ceb83 [SCSI] return ENO... |
559 560 561 562 563 564 |
case DATA_PROTECT: if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { /* Thin provisioning hard threshold reached */ set_host_byte(scmd, DID_ALLOC_FAILURE); return SUCCESS; } |
1da177e4c Linux-2.6.12-rc2 |
565 566 567 |
case COPY_ABORTED: case VOLUME_OVERFLOW: case MISCOMPARE: |
63583cca7 [SCSI] Add detail... |
568 |
case BLANK_CHECK: |
87f14e658 [SCSI] Set hostby... |
569 570 |
set_host_byte(scmd, DID_TARGET_FAILURE); return SUCCESS; |
1da177e4c Linux-2.6.12-rc2 |
571 572 |
case MEDIUM_ERROR: |
fd1b494d4 [SCSI] Fix sense ... |
573 574 575 |
if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ sshdr.asc == 0x13 || /* AMNF DATA FIELD */ sshdr.asc == 0x14) { /* RECORD NOT FOUND */ |
7e782af57 [SCSI] Return ENO... |
576 |
set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e658 [SCSI] Set hostby... |
577 |
return SUCCESS; |
fd1b494d4 [SCSI] Fix sense ... |
578 |
} |
1da177e4c Linux-2.6.12-rc2 |
579 580 581 582 |
return NEEDS_RETRY; case HARDWARE_ERROR: if (scmd->device->retry_hwerror) |
bb0003c1e [SCSI] make scsi_... |
583 |
return ADD_TO_MLQUEUE; |
1da177e4c Linux-2.6.12-rc2 |
584 |
else |
87f14e658 [SCSI] Set hostby... |
585 |
set_host_byte(scmd, DID_TARGET_FAILURE); |
1da177e4c Linux-2.6.12-rc2 |
586 587 |
case ILLEGAL_REQUEST: |
47ac56db1 [SCSI] scsi_error... |
588 589 590 591 |
if (sshdr.asc == 0x20 || /* Invalid command operation code */ sshdr.asc == 0x21 || /* Logical block address out of range */ sshdr.asc == 0x24 || /* Invalid field in cdb */ sshdr.asc == 0x26) { /* Parameter value invalid */ |
87f14e658 [SCSI] Set hostby... |
592 |
set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db1 [SCSI] scsi_error... |
593 594 |
} return SUCCESS; |
1da177e4c Linux-2.6.12-rc2 |
595 596 597 598 |
default: return SUCCESS; } } |
4a84067db [SCSI] add queue_... |
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 |
static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) { struct scsi_host_template *sht = sdev->host->hostt; struct scsi_device *tmp_sdev; if (!sht->change_queue_depth || sdev->queue_depth >= sdev->max_queue_depth) return; if (time_before(jiffies, sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) return; if (time_before(jiffies, sdev->last_queue_full_time + sdev->queue_ramp_up_period)) return; /* * Walk all devices of a target and do * ramp up on them. */ shost_for_each_device(tmp_sdev, sdev->host) { if (tmp_sdev->channel != sdev->channel || tmp_sdev->id != sdev->id || tmp_sdev->queue_depth == sdev->max_queue_depth) continue; /* * call back into LLD to increase queue_depth by one * with ramp up reason code. */ sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, SCSI_QDEPTH_RAMP_UP); sdev->last_queue_ramp_up = jiffies; } } |
42a6a9183 [SCSI] scsi error... |
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 |
static void scsi_handle_queue_full(struct scsi_device *sdev) { struct scsi_host_template *sht = sdev->host->hostt; struct scsi_device *tmp_sdev; if (!sht->change_queue_depth) return; shost_for_each_device(tmp_sdev, sdev->host) { if (tmp_sdev->channel != sdev->channel || tmp_sdev->id != sdev->id) continue; /* * We do not know the number of commands that were at * the device when we got the queue full so we start * from the highest possible value and work our way down. */ sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, SCSI_QDEPTH_QFULL); } } |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 658 659 660 661 662 663 |
/** * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. * @scmd: SCSI cmd to examine. * * Notes: * This is *only* called when we are examining the status of commands * queued during error recovery. the main difference here is that we * don't allow for the possibility of retries here, and we are a lot * more restrictive about what we consider acceptable. |
dc8875e10 [SCSI] docbook an... |
664 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 |
static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) { /* * first check the host byte, to see if there is anything in there * that would indicate what we need to do. */ if (host_byte(scmd->result) == DID_RESET) { /* * rats. we are already in the error handler, so we now * get to try and figure out what to do next. if the sense * is valid, we have a pretty good idea of what to do. * if not, we mark it as FAILED. */ return scsi_check_sense(scmd); } if (host_byte(scmd->result) != DID_OK) return FAILED; /* * next, check the message byte. */ if (msg_byte(scmd->result) != COMMAND_COMPLETE) return FAILED; /* * now, check the status byte to see if this indicates * anything special. */ switch (status_byte(scmd->result)) { case GOOD: |
4a84067db [SCSI] add queue_... |
695 |
scsi_handle_queue_ramp_up(scmd->device); |
1da177e4c Linux-2.6.12-rc2 |
696 697 698 699 700 701 702 703 704 705 706 |
case COMMAND_TERMINATED: return SUCCESS; case CHECK_CONDITION: return scsi_check_sense(scmd); case CONDITION_GOOD: case INTERMEDIATE_GOOD: case INTERMEDIATE_C_GOOD: /* * who knows? FIXME(eric) */ return SUCCESS; |
5f91bb050 [SCSI] reservatio... |
707 |
case RESERVATION_CONFLICT: |
67110dfd4 [SCSI] make error... |
708 709 710 711 712 713 |
if (scmd->cmnd[0] == TEST_UNIT_READY) /* it is a success, we probed the device and * found it */ return SUCCESS; /* otherwise, we failed to send the command */ return FAILED; |
1da177e4c Linux-2.6.12-rc2 |
714 |
case QUEUE_FULL: |
42a6a9183 [SCSI] scsi error... |
715 716 717 |
scsi_handle_queue_full(scmd->device); /* fall through */ case BUSY: |
3eb3a9285 [SCSI] Return NEE... |
718 |
return NEEDS_RETRY; |
1da177e4c Linux-2.6.12-rc2 |
719 720 721 722 723 724 725 |
default: return FAILED; } return FAILED; } /** |
1da177e4c Linux-2.6.12-rc2 |
726 727 |
* scsi_eh_done - Completion function for error handling. * @scmd: Cmd that is done. |
dc8875e10 [SCSI] docbook an... |
728 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
729 730 |
static void scsi_eh_done(struct scsi_cmnd *scmd) { |
0bf8c8697 Reduce sequential... |
731 |
struct completion *eh_action; |
85631672e [SCSI] fix OOPS d... |
732 |
|
91921e016 scsi: use dev_pri... |
733 734 735 |
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "%s scmd: %p result: %x ", |
cadbd4a5e [SCSI] replace __... |
736 |
__func__, scmd, scmd->result)); |
85631672e [SCSI] fix OOPS d... |
737 738 739 740 |
eh_action = scmd->device->host->eh_action; if (eh_action) complete(eh_action); |
1da177e4c Linux-2.6.12-rc2 |
741 742 743 |
} /** |
292148f8b [SCSI] scsi_error... |
744 |
* scsi_try_host_reset - ask host adapter to reset itself |
c2b3ebd0d scsi: Spelling hs... |
745 |
* @scmd: SCSI cmd to send host reset. |
dc8875e10 [SCSI] docbook an... |
746 |
*/ |
292148f8b [SCSI] scsi_error... |
747 748 749 750 |
static int scsi_try_host_reset(struct scsi_cmnd *scmd) { unsigned long flags; int rtn; |
0bf8c8697 Reduce sequential... |
751 752 |
struct Scsi_Host *host = scmd->device->host; struct scsi_host_template *hostt = host->hostt; |
292148f8b [SCSI] scsi_error... |
753 |
|
91921e016 scsi: use dev_pri... |
754 755 756 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, host, "Snd Host RST ")); |
292148f8b [SCSI] scsi_error... |
757 |
|
0bf8c8697 Reduce sequential... |
758 |
if (!hostt->eh_host_reset_handler) |
292148f8b [SCSI] scsi_error... |
759 |
return FAILED; |
0bf8c8697 Reduce sequential... |
760 |
rtn = hostt->eh_host_reset_handler(scmd); |
292148f8b [SCSI] scsi_error... |
761 762 |
if (rtn == SUCCESS) { |
0bf8c8697 Reduce sequential... |
763 |
if (!hostt->skip_settle_delay) |
292148f8b [SCSI] scsi_error... |
764 |
ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c8697 Reduce sequential... |
765 766 767 |
spin_lock_irqsave(host->host_lock, flags); scsi_report_bus_reset(host, scmd_channel(scmd)); spin_unlock_irqrestore(host->host_lock, flags); |
292148f8b [SCSI] scsi_error... |
768 769 770 771 772 773 774 775 |
} return rtn; } /** * scsi_try_bus_reset - ask host to perform a bus reset * @scmd: SCSI cmd to send bus reset. |
dc8875e10 [SCSI] docbook an... |
776 |
*/ |
292148f8b [SCSI] scsi_error... |
777 778 779 780 |
static int scsi_try_bus_reset(struct scsi_cmnd *scmd) { unsigned long flags; int rtn; |
0bf8c8697 Reduce sequential... |
781 782 |
struct Scsi_Host *host = scmd->device->host; struct scsi_host_template *hostt = host->hostt; |
292148f8b [SCSI] scsi_error... |
783 |
|
91921e016 scsi: use dev_pri... |
784 785 786 |
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "%s: Snd Bus RST ", __func__)); |
292148f8b [SCSI] scsi_error... |
787 |
|
0bf8c8697 Reduce sequential... |
788 |
if (!hostt->eh_bus_reset_handler) |
292148f8b [SCSI] scsi_error... |
789 |
return FAILED; |
0bf8c8697 Reduce sequential... |
790 |
rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8b [SCSI] scsi_error... |
791 792 |
if (rtn == SUCCESS) { |
0bf8c8697 Reduce sequential... |
793 |
if (!hostt->skip_settle_delay) |
292148f8b [SCSI] scsi_error... |
794 |
ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c8697 Reduce sequential... |
795 796 797 |
spin_lock_irqsave(host->host_lock, flags); scsi_report_bus_reset(host, scmd_channel(scmd)); spin_unlock_irqrestore(host->host_lock, flags); |
292148f8b [SCSI] scsi_error... |
798 799 800 801 |
} return rtn; } |
30bd7df8c [SCSI] scsi_error... |
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 |
static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) { sdev->was_reset = 1; sdev->expecting_cc_ua = 1; } /** * scsi_try_target_reset - Ask host to perform a target reset * @scmd: SCSI cmd used to send a target reset * * Notes: * There is no timeout for this operation. if this operation is * unreliable for a given host, then the host itself needs to put a * timer on it, and set the host back to a consistent state prior to * returning. */ static int scsi_try_target_reset(struct scsi_cmnd *scmd) { unsigned long flags; int rtn; |
0bf8c8697 Reduce sequential... |
822 823 |
struct Scsi_Host *host = scmd->device->host; struct scsi_host_template *hostt = host->hostt; |
30bd7df8c [SCSI] scsi_error... |
824 |
|
0bf8c8697 Reduce sequential... |
825 |
if (!hostt->eh_target_reset_handler) |
30bd7df8c [SCSI] scsi_error... |
826 |
return FAILED; |
0bf8c8697 Reduce sequential... |
827 |
rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8c [SCSI] scsi_error... |
828 |
if (rtn == SUCCESS) { |
0bf8c8697 Reduce sequential... |
829 |
spin_lock_irqsave(host->host_lock, flags); |
30bd7df8c [SCSI] scsi_error... |
830 831 |
__starget_for_each_device(scsi_target(scmd->device), NULL, __scsi_report_device_reset); |
0bf8c8697 Reduce sequential... |
832 |
spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8c [SCSI] scsi_error... |
833 834 835 836 |
} return rtn; } |
292148f8b [SCSI] scsi_error... |
837 838 839 840 841 842 843 844 845 |
/** * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev * @scmd: SCSI cmd used to send BDR * * Notes: * There is no timeout for this operation. if this operation is * unreliable for a given host, then the host itself needs to put a * timer on it, and set the host back to a consistent state prior to * returning. |
dc8875e10 [SCSI] docbook an... |
846 |
*/ |
292148f8b [SCSI] scsi_error... |
847 848 849 |
static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) { int rtn; |
0bf8c8697 Reduce sequential... |
850 |
struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8b [SCSI] scsi_error... |
851 |
|
0bf8c8697 Reduce sequential... |
852 |
if (!hostt->eh_device_reset_handler) |
292148f8b [SCSI] scsi_error... |
853 |
return FAILED; |
0bf8c8697 Reduce sequential... |
854 |
rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8c [SCSI] scsi_error... |
855 856 |
if (rtn == SUCCESS) __scsi_report_device_reset(scmd->device, NULL); |
292148f8b [SCSI] scsi_error... |
857 858 |
return rtn; } |
0bf8c8697 Reduce sequential... |
859 |
static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8b [SCSI] scsi_error... |
860 |
{ |
0bf8c8697 Reduce sequential... |
861 |
if (!hostt->eh_abort_handler) |
292148f8b [SCSI] scsi_error... |
862 |
return FAILED; |
0bf8c8697 Reduce sequential... |
863 |
return hostt->eh_abort_handler(scmd); |
292148f8b [SCSI] scsi_error... |
864 |
} |
292148f8b [SCSI] scsi_error... |
865 866 |
static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) { |
0bf8c8697 Reduce sequential... |
867 |
if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8b [SCSI] scsi_error... |
868 |
if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8c [SCSI] scsi_error... |
869 870 871 |
if (scsi_try_target_reset(scmd) != SUCCESS) if (scsi_try_bus_reset(scmd) != SUCCESS) scsi_try_host_reset(scmd); |
292148f8b [SCSI] scsi_error... |
872 873 874 |
} /** |
3b729f764 scsi: fix comment... |
875 |
* scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de5 [SCSI] use one-el... |
876 |
* @scmd: SCSI command structure to hijack |
e1c234685 [SCSI] scsi_error... |
877 |
* @ses: structure to save restore information |
55db6c1b8 [SCSI] scsi_error... |
878 |
* @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b244 [SCSI] Let scsi_c... |
879 |
* @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b8 [SCSI] scsi_error... |
880 |
* @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de5 [SCSI] use one-el... |
881 |
* |
e1c234685 [SCSI] scsi_error... |
882 |
* This function is used to save a scsi command information before re-execution |
55db6c1b8 [SCSI] scsi_error... |
883 884 885 886 |
* as part of the error recovery process. If @sense_bytes is 0 the command * sent must be one that does not transfer any data. If @sense_bytes != 0 * @cmnd is ignored and this functions sets up a REQUEST_SENSE command * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. |
dc8875e10 [SCSI] docbook an... |
887 |
*/ |
e1c234685 [SCSI] scsi_error... |
888 889 |
void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) |
1da177e4c Linux-2.6.12-rc2 |
890 |
{ |
f59114b7b [PATCH] scsi: scs... |
891 |
struct scsi_device *sdev = scmd->device; |
1da177e4c Linux-2.6.12-rc2 |
892 |
|
631c228cd [SCSI] hide EH ba... |
893 894 895 896 897 898 899 |
/* * We need saved copies of a number of fields - this is because * error handling may need to overwrite these with different values * to run different commands, and once error handling is complete, * we will need to restore these values prior to running the actual * command. */ |
e1c234685 [SCSI] scsi_error... |
900 |
ses->cmd_len = scmd->cmd_len; |
64a87b244 [SCSI] Let scsi_c... |
901 |
ses->cmnd = scmd->cmnd; |
e1c234685 [SCSI] scsi_error... |
902 |
ses->data_direction = scmd->sc_data_direction; |
30b0c37b2 [SCSI] implement ... |
903 |
ses->sdb = scmd->sdb; |
6f9a35e2d [SCSI] bidirectio... |
904 |
ses->next_rq = scmd->request->next_rq; |
e1c234685 [SCSI] scsi_error... |
905 |
ses->result = scmd->result; |
12265709a [SCSI] scsi_eh_pr... |
906 |
ses->underflow = scmd->underflow; |
db007fc5e [SCSI] Command pr... |
907 |
ses->prot_op = scmd->prot_op; |
631c228cd [SCSI] hide EH ba... |
908 |
|
db007fc5e [SCSI] Command pr... |
909 |
scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f812 [SCSI] More USB d... |
910 |
scmd->eh_eflags = 0; |
64a87b244 [SCSI] Let scsi_c... |
911 912 |
scmd->cmnd = ses->eh_cmnd; memset(scmd->cmnd, 0, BLK_MAX_CDB); |
30b0c37b2 [SCSI] implement ... |
913 |
memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2d [SCSI] bidirectio... |
914 |
scmd->request->next_rq = NULL; |
644373a42 [SCSI] Fix comman... |
915 |
scmd->result = 0; |
30b0c37b2 [SCSI] implement ... |
916 |
|
55db6c1b8 [SCSI] scsi_error... |
917 |
if (sense_bytes) { |
30b0c37b2 [SCSI] implement ... |
918 919 |
scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, sense_bytes); |
e1c234685 [SCSI] scsi_error... |
920 |
sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b2 [SCSI] implement ... |
921 922 |
scmd->sdb.length); scmd->sdb.table.sgl = &ses->sense_sgl; |
55db6c1b8 [SCSI] scsi_error... |
923 |
scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b2 [SCSI] implement ... |
924 |
scmd->sdb.table.nents = 1; |
55db6c1b8 [SCSI] scsi_error... |
925 |
scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b2 [SCSI] implement ... |
926 |
scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b8 [SCSI] scsi_error... |
927 |
scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228cd [SCSI] hide EH ba... |
928 |
} else { |
631c228cd [SCSI] hide EH ba... |
929 |
scmd->sc_data_direction = DMA_NONE; |
55db6c1b8 [SCSI] scsi_error... |
930 |
if (cmnd) { |
64a87b244 [SCSI] Let scsi_c... |
931 |
BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b8 [SCSI] scsi_error... |
932 933 934 |
memcpy(scmd->cmnd, cmnd, cmnd_size); scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); } |
631c228cd [SCSI] hide EH ba... |
935 936 937 |
} scmd->underflow = 0; |
631c228cd [SCSI] hide EH ba... |
938 |
|
55db6c1b8 [SCSI] scsi_error... |
939 |
if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4c Linux-2.6.12-rc2 |
940 |
scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7b [PATCH] scsi: scs... |
941 |
(sdev->lun << 5 & 0xe0); |
1da177e4c Linux-2.6.12-rc2 |
942 |
|
631c228cd [SCSI] hide EH ba... |
943 944 945 946 |
/* * Zero the sense buffer. The scsi spec mandates that any * untransferred sense data should be interpreted as being zero. */ |
b80ca4f7e [SCSI] replace si... |
947 |
memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c234685 [SCSI] scsi_error... |
948 949 950 951 |
} EXPORT_SYMBOL(scsi_eh_prep_cmnd); /** |
3b729f764 scsi: fix comment... |
952 |
* scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c234685 [SCSI] scsi_error... |
953 |
* @scmd: SCSI command structure to restore |
477e608c0 [SCSI] fix docume... |
954 |
* @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c234685 [SCSI] scsi_error... |
955 |
* |
477e608c0 [SCSI] fix docume... |
956 |
* Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e10 [SCSI] docbook an... |
957 |
*/ |
e1c234685 [SCSI] scsi_error... |
958 959 960 961 962 963 |
void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) { /* * Restore original data */ scmd->cmd_len = ses->cmd_len; |
64a87b244 [SCSI] Let scsi_c... |
964 |
scmd->cmnd = ses->cmnd; |
e1c234685 [SCSI] scsi_error... |
965 |
scmd->sc_data_direction = ses->data_direction; |
30b0c37b2 [SCSI] implement ... |
966 |
scmd->sdb = ses->sdb; |
6f9a35e2d [SCSI] bidirectio... |
967 |
scmd->request->next_rq = ses->next_rq; |
e1c234685 [SCSI] scsi_error... |
968 |
scmd->result = ses->result; |
12265709a [SCSI] scsi_eh_pr... |
969 |
scmd->underflow = ses->underflow; |
db007fc5e [SCSI] Command pr... |
970 |
scmd->prot_op = ses->prot_op; |
e1c234685 [SCSI] scsi_error... |
971 972 |
} EXPORT_SYMBOL(scsi_eh_restore_cmnd); |
631c228cd [SCSI] hide EH ba... |
973 |
|
e1c234685 [SCSI] scsi_error... |
974 |
/** |
3b729f764 scsi: fix comment... |
975 |
* scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c234685 [SCSI] scsi_error... |
976 977 978 979 980 981 982 983 984 985 986 |
* @scmd: SCSI command structure to hijack * @cmnd: CDB to send * @cmnd_size: size in bytes of @cmnd * @timeout: timeout for this request * @sense_bytes: size of sense data to copy or 0 * * This function is used to send a scsi command down to a target device * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. * * Return value: * SUCCESS or FAILED or NEEDS_RETRY |
dc8875e10 [SCSI] docbook an... |
987 |
*/ |
e1c234685 [SCSI] scsi_error... |
988 989 990 991 992 993 |
static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, int cmnd_size, int timeout, unsigned sense_bytes) { struct scsi_device *sdev = scmd->device; struct Scsi_Host *shost = sdev->host; DECLARE_COMPLETION_ONSTACK(done); |
fc73648a5 [SCSI] Handle MLQ... |
994 |
unsigned long timeleft = timeout; |
e1c234685 [SCSI] scsi_error... |
995 |
struct scsi_eh_save ses; |
fc73648a5 [SCSI] Handle MLQ... |
996 |
const unsigned long stall_for = msecs_to_jiffies(100); |
e1c234685 [SCSI] scsi_error... |
997 |
int rtn; |
fc73648a5 [SCSI] Handle MLQ... |
998 |
retry: |
e1c234685 [SCSI] scsi_error... |
999 |
scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a52 [SCSI] use a comp... |
1000 |
shost->eh_action = &done; |
1da177e4c Linux-2.6.12-rc2 |
1001 |
|
1da177e4c Linux-2.6.12-rc2 |
1002 |
scsi_log_send(scmd); |
f281233d3 SCSI host lock pu... |
1003 |
scmd->scsi_done = scsi_eh_done; |
fc73648a5 [SCSI] Handle MLQ... |
1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 |
rtn = shost->hostt->queuecommand(shost, scmd); if (rtn) { if (timeleft > stall_for) { scsi_eh_restore_cmnd(scmd, &ses); timeleft -= stall_for; msleep(jiffies_to_msecs(stall_for)); goto retry; } /* signal not to enter either branch of the if () below */ timeleft = 0; rtn = NEEDS_RETRY; } else { timeleft = wait_for_completion_timeout(&done, timeout); |
ac61d1955 scsi: set correct... |
1017 |
rtn = SUCCESS; |
fc73648a5 [SCSI] Handle MLQ... |
1018 |
} |
1da177e4c Linux-2.6.12-rc2 |
1019 |
|
f59114b7b [PATCH] scsi: scs... |
1020 |
shost->eh_action = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1021 |
|
fc73648a5 [SCSI] Handle MLQ... |
1022 |
scsi_log_completion(scmd, rtn); |
1da177e4c Linux-2.6.12-rc2 |
1023 |
|
91921e016 scsi: use dev_pri... |
1024 1025 1026 |
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "%s: scmd: %p, timeleft: %ld ", |
cadbd4a5e [SCSI] replace __... |
1027 |
__func__, scmd, timeleft)); |
1da177e4c Linux-2.6.12-rc2 |
1028 1029 |
/* |
fc73648a5 [SCSI] Handle MLQ... |
1030 1031 1032 1033 1034 1035 1036 |
* If there is time left scsi_eh_done got called, and we will examine * the actual status codes to see whether the command actually did * complete normally, else if we have a zero return and no time left, * the command must still be pending, so abort it and return FAILED. * If we never actually managed to issue the command, because * ->queuecommand() kept returning non zero, use the rtn = FAILED * value above (so don't execute either branch of the if) |
1da177e4c Linux-2.6.12-rc2 |
1037 |
*/ |
7dfdc9a52 [SCSI] use a comp... |
1038 |
if (timeleft) { |
1da177e4c Linux-2.6.12-rc2 |
1039 |
rtn = scsi_eh_completed_normally(scmd); |
91921e016 scsi: use dev_pri... |
1040 1041 1042 |
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "%s: scsi_eh_completed_normally %x ", __func__, rtn)); |
7dfdc9a52 [SCSI] use a comp... |
1043 |
|
1da177e4c Linux-2.6.12-rc2 |
1044 1045 1046 1047 1048 |
switch (rtn) { case SUCCESS: case NEEDS_RETRY: case FAILED: break; |
6e883b0e4 [SCSI] Retry ADD_... |
1049 1050 1051 |
case ADD_TO_MLQUEUE: rtn = NEEDS_RETRY; break; |
1da177e4c Linux-2.6.12-rc2 |
1052 1053 1054 1055 |
default: rtn = FAILED; break; } |
fc73648a5 [SCSI] Handle MLQ... |
1056 |
} else if (!rtn) { |
292148f8b [SCSI] scsi_error... |
1057 |
scsi_abort_eh_cmnd(scmd); |
7dfdc9a52 [SCSI] use a comp... |
1058 |
rtn = FAILED; |
1da177e4c Linux-2.6.12-rc2 |
1059 |
} |
e1c234685 [SCSI] scsi_error... |
1060 |
scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a22 [SCSI] Handle dis... |
1061 |
|
1da177e4c Linux-2.6.12-rc2 |
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 |
return rtn; } /** * scsi_request_sense - Request sense data from a particular target. * @scmd: SCSI cmd for request sense. * * Notes: * Some hosts automatically obtain this information, others require * that we obtain it on our own. This function will *not* return until * the command either times out, or it completes. |
dc8875e10 [SCSI] docbook an... |
1073 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1074 1075 |
static int scsi_request_sense(struct scsi_cmnd *scmd) { |
0816c9251 [SCSI] Allow erro... |
1076 |
return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4c Linux-2.6.12-rc2 |
1077 |
} |
2451079bc [SCSI] Fix errati... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 |
static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn) { if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); if (sdrv->eh_action) rtn = sdrv->eh_action(scmd, rtn); } return rtn; } |
1da177e4c Linux-2.6.12-rc2 |
1087 1088 1089 1090 1091 1092 1093 1094 |
/** * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. * @scmd: Original SCSI cmd that eh has finished. * @done_q: Queue for processed commands. * * Notes: * We don't want to use the normal command completion while we are are * still handling errors - it may cause other commands to be queued, |
eb44820c2 [SCSI] Add Docume... |
1095 |
* and that would disturb what we are doing. Thus we really want to |
1da177e4c Linux-2.6.12-rc2 |
1096 1097 |
* keep a list of pending commands for final completion, and once we * are ready to leave error handling we handle completion for real. |
dc8875e10 [SCSI] docbook an... |
1098 |
*/ |
041c5fc33 [PATCH] SCSI: exp... |
1099 |
void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4c Linux-2.6.12-rc2 |
1100 1101 |
{ scmd->device->host->host_failed--; |
3111b0d16 [SCSI] remove scs... |
1102 |
scmd->eh_eflags = 0; |
1da177e4c Linux-2.6.12-rc2 |
1103 1104 |
list_move_tail(&scmd->eh_entry, done_q); } |
041c5fc33 [PATCH] SCSI: exp... |
1105 |
EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4c Linux-2.6.12-rc2 |
1106 1107 1108 1109 |
/** * scsi_eh_get_sense - Get device sense data. * @work_q: Queue of commands to process. |
eb44820c2 [SCSI] Add Docume... |
1110 |
* @done_q: Queue of processed commands. |
1da177e4c Linux-2.6.12-rc2 |
1111 1112 1113 |
* * Description: * See if we need to request sense information. if so, then get it |
0bf8c8697 Reduce sequential... |
1114 |
* now, so we have a better idea of what to do. |
1da177e4c Linux-2.6.12-rc2 |
1115 1116 1117 |
* * Notes: * This has the unfortunate side effect that if a shost adapter does |
eb44820c2 [SCSI] Add Docume... |
1118 |
* not automatically request sense information, we end up shutting |
1da177e4c Linux-2.6.12-rc2 |
1119 1120 1121 1122 1123 1124 1125 |
* it down before we request it. * * All drivers should request sense information internally these days, * so for now all I have to say is tough noogies if you end up in here. * * XXX: Long term this code should go away, but that needs an audit of * all LLDDs first. |
dc8875e10 [SCSI] docbook an... |
1126 |
*/ |
dca84e469 [SCSI] scsi_error... |
1127 1128 |
int scsi_eh_get_sense(struct list_head *work_q, struct list_head *done_q) |
1da177e4c Linux-2.6.12-rc2 |
1129 |
{ |
937abeaad [SCSI] use list_f... |
1130 |
struct scsi_cmnd *scmd, *next; |
b45620229 [SCSI] Add 'eh_de... |
1131 |
struct Scsi_Host *shost; |
1da177e4c Linux-2.6.12-rc2 |
1132 |
int rtn; |
937abeaad [SCSI] use list_f... |
1133 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d16 [SCSI] remove scs... |
1134 |
if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4c Linux-2.6.12-rc2 |
1135 1136 |
SCSI_SENSE_VALID(scmd)) continue; |
b45620229 [SCSI] Add 'eh_de... |
1137 |
shost = scmd->device->host; |
b45620229 [SCSI] Add 'eh_de... |
1138 |
if (scsi_host_eh_past_deadline(shost)) { |
b45620229 [SCSI] Add 'eh_de... |
1139 1140 1141 1142 1143 1144 1145 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "skip %s, past eh deadline ", __func__)); break; } |
d555a2abf [SCSI] Fix spurio... |
1146 1147 1148 1149 1150 1151 1152 1153 |
if (status_byte(scmd->result) != CHECK_CONDITION) /* * don't request sense if there's no check condition * status because the error we're processing isn't one * that has a sense code (and some devices get * confused by sense requests out of the blue) */ continue; |
3bf743e7c [SCSI] use {sdev,... |
1154 1155 1156 1157 |
SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, "%s: requesting sense ", current->comm)); |
1da177e4c Linux-2.6.12-rc2 |
1158 1159 1160 |
rtn = scsi_request_sense(scmd); if (rtn != SUCCESS) continue; |
91921e016 scsi: use dev_pri... |
1161 1162 1163 1164 |
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "sense requested for %p result %x ", scmd, scmd->result)); |
1da177e4c Linux-2.6.12-rc2 |
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 |
SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); rtn = scsi_decide_disposition(scmd); /* * if the result was normal, then just pass it along to the * upper level. */ if (rtn == SUCCESS) /* we don't want this command reissued, just * finished with the sense data, so set * retries to the max allowed to ensure it * won't get reissued */ scmd->retries = scmd->allowed; else if (rtn != NEEDS_RETRY) continue; scsi_eh_finish_cmd(scmd, done_q); } return list_empty(work_q); } |
dca84e469 [SCSI] scsi_error... |
1187 |
EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4c Linux-2.6.12-rc2 |
1188 1189 |
/** |
1da177e4c Linux-2.6.12-rc2 |
1190 |
* scsi_eh_tur - Send TUR to device. |
eb44820c2 [SCSI] Add Docume... |
1191 |
* @scmd: &scsi_cmnd to send TUR |
1da177e4c Linux-2.6.12-rc2 |
1192 1193 1194 |
* * Return value: * 0 - Device is ready. 1 - Device NOT ready. |
dc8875e10 [SCSI] docbook an... |
1195 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1196 1197 1198 1199 1200 1201 |
static int scsi_eh_tur(struct scsi_cmnd *scmd) { static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; int retry_cnt = 1, rtn; retry_tur: |
0816c9251 [SCSI] Allow erro... |
1202 1203 |
rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, scmd->device->eh_timeout, 0); |
1da177e4c Linux-2.6.12-rc2 |
1204 |
|
91921e016 scsi: use dev_pri... |
1205 1206 1207 |
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "%s: scmd %p rtn %x ", __func__, scmd, rtn)); |
631c228cd [SCSI] hide EH ba... |
1208 1209 1210 |
switch (rtn) { case NEEDS_RETRY: |
1da177e4c Linux-2.6.12-rc2 |
1211 1212 |
if (retry_cnt--) goto retry_tur; |
631c228cd [SCSI] hide EH ba... |
1213 1214 |
/*FALLTHRU*/ case SUCCESS: |
e47373ec1 [SCSI] return suc... |
1215 |
return 0; |
631c228cd [SCSI] hide EH ba... |
1216 1217 |
default: return 1; |
e47373ec1 [SCSI] return suc... |
1218 |
} |
1da177e4c Linux-2.6.12-rc2 |
1219 1220 1221 |
} /** |
3eef6257d [SCSI] Reduce err... |
1222 1223 |
* scsi_eh_test_devices - check if devices are responding from error recovery. * @cmd_list: scsi commands in error recovery. |
74cf298fe scsi: fix various... |
1224 1225 1226 |
* @work_q: queue for commands which still need more error recovery * @done_q: queue for commands which are finished * @try_stu: boolean on if a STU command should be tried in addition to TUR. |
3eef6257d [SCSI] Reduce err... |
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 |
* * Decription: * Tests if devices are in a working state. Commands to devices now in * a working state are sent to the done_q while commands to devices which * are still failing to respond are returned to the work_q for more * processing. **/ static int scsi_eh_test_devices(struct list_head *cmd_list, struct list_head *work_q, struct list_head *done_q, int try_stu) { struct scsi_cmnd *scmd, *next; struct scsi_device *sdev; int finish_cmds; while (!list_empty(cmd_list)) { scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); sdev = scmd->device; |
b45620229 [SCSI] Add 'eh_de... |
1245 |
if (!try_stu) { |
b45620229 [SCSI] Add 'eh_de... |
1246 1247 1248 |
if (scsi_host_eh_past_deadline(sdev->host)) { /* Push items back onto work_q */ list_splice_init(cmd_list, work_q); |
b45620229 [SCSI] Add 'eh_de... |
1249 1250 1251 1252 1253 1254 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, sdev->host, "skip %s, past eh deadline", __func__)); break; } |
b45620229 [SCSI] Add 'eh_de... |
1255 |
} |
3eef6257d [SCSI] Reduce err... |
1256 1257 1258 1259 1260 1261 1262 |
finish_cmds = !scsi_device_online(scmd->device) || (try_stu && !scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) || !scsi_eh_tur(scmd); list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) if (scmd->device == sdev) { |
2451079bc [SCSI] Fix errati... |
1263 1264 1265 |
if (finish_cmds && (try_stu || scsi_eh_action(scmd, SUCCESS) == SUCCESS)) |
3eef6257d [SCSI] Reduce err... |
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 |
scsi_eh_finish_cmd(scmd, done_q); else list_move_tail(&scmd->eh_entry, work_q); } } return list_empty(work_q); } /** |
eb44820c2 [SCSI] Add Docume... |
1276 1277 1278 |
* scsi_eh_abort_cmds - abort pending commands. * @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. |
1da177e4c Linux-2.6.12-rc2 |
1279 1280 1281 |
* * Decription: * Try and see whether or not it makes sense to try and abort the |
eb44820c2 [SCSI] Add Docume... |
1282 1283 |
* running command. This only works out to be the case if we have one * command that has timed out. If the command simply failed, it makes |
1da177e4c Linux-2.6.12-rc2 |
1284 1285 |
* no sense to try and abort the command, since as far as the shost * adapter is concerned, it isn't running. |
dc8875e10 [SCSI] docbook an... |
1286 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1287 1288 1289 |
static int scsi_eh_abort_cmds(struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1290 |
struct scsi_cmnd *scmd, *next; |
3eef6257d [SCSI] Reduce err... |
1291 |
LIST_HEAD(check_list); |
1da177e4c Linux-2.6.12-rc2 |
1292 |
int rtn; |
b45620229 [SCSI] Add 'eh_de... |
1293 |
struct Scsi_Host *shost; |
1da177e4c Linux-2.6.12-rc2 |
1294 |
|
937abeaad [SCSI] use list_f... |
1295 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d16 [SCSI] remove scs... |
1296 |
if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4c Linux-2.6.12-rc2 |
1297 |
continue; |
b45620229 [SCSI] Add 'eh_de... |
1298 |
shost = scmd->device->host; |
b45620229 [SCSI] Add 'eh_de... |
1299 |
if (scsi_host_eh_past_deadline(shost)) { |
b45620229 [SCSI] Add 'eh_de... |
1300 1301 1302 1303 1304 1305 1306 1307 |
list_splice_init(&check_list, work_q); SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "skip %s, past eh deadline ", __func__)); return list_empty(work_q); } |
91921e016 scsi: use dev_pri... |
1308 1309 1310 1311 1312 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: aborting cmd: 0x%p ", current->comm, scmd)); |
b45620229 [SCSI] Add 'eh_de... |
1313 |
rtn = scsi_try_to_abort_cmd(shost->hostt, scmd); |
6fd046f96 [SCSI] scsi_error... |
1314 |
if (rtn == FAILED) { |
91921e016 scsi: use dev_pri... |
1315 1316 1317 1318 1319 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: aborting cmd failed: 0x%p ", current->comm, scmd)); |
6fd046f96 [SCSI] scsi_error... |
1320 1321 1322 1323 1324 1325 1326 1327 |
list_splice_init(&check_list, work_q); return list_empty(work_q); } scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; if (rtn == FAST_IO_FAIL) scsi_eh_finish_cmd(scmd, done_q); else list_move_tail(&scmd->eh_entry, &check_list); |
1da177e4c Linux-2.6.12-rc2 |
1328 |
} |
3eef6257d [SCSI] Reduce err... |
1329 |
return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4c Linux-2.6.12-rc2 |
1330 1331 1332 |
} /** |
1da177e4c Linux-2.6.12-rc2 |
1333 |
* scsi_eh_try_stu - Send START_UNIT to device. |
eb44820c2 [SCSI] Add Docume... |
1334 |
* @scmd: &scsi_cmnd to send START_UNIT |
1da177e4c Linux-2.6.12-rc2 |
1335 1336 1337 |
* * Return value: * 0 - Device is ready. 1 - Device NOT ready. |
dc8875e10 [SCSI] docbook an... |
1338 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1339 1340 1341 |
static int scsi_eh_try_stu(struct scsi_cmnd *scmd) { static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; |
1da177e4c Linux-2.6.12-rc2 |
1342 |
|
631c228cd [SCSI] hide EH ba... |
1343 |
if (scmd->device->allow_restart) { |
ed773e664 [SCSI] scsi_error... |
1344 1345 1346 |
int i, rtn = NEEDS_RETRY; for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) |
9728c0814 [SCSI] make scsi_... |
1347 |
rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4c Linux-2.6.12-rc2 |
1348 |
|
631c228cd [SCSI] hide EH ba... |
1349 1350 1351 |
if (rtn == SUCCESS) return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1352 |
|
1da177e4c Linux-2.6.12-rc2 |
1353 1354 1355 1356 1357 |
return 1; } /** * scsi_eh_stu - send START_UNIT if needed |
eb44820c2 [SCSI] Add Docume... |
1358 |
* @shost: &scsi host being recovered. |
74cf298fe scsi: fix various... |
1359 |
* @work_q: &list_head for pending commands. |
eb44820c2 [SCSI] Add Docume... |
1360 |
* @done_q: &list_head for processed commands. |
1da177e4c Linux-2.6.12-rc2 |
1361 1362 1363 |
* * Notes: * If commands are failing due to not ready, initializing command required, |
0bf8c8697 Reduce sequential... |
1364 |
* try revalidating the device, which will end up sending a start unit. |
dc8875e10 [SCSI] docbook an... |
1365 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1366 1367 1368 1369 |
static int scsi_eh_stu(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1370 |
struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
1371 1372 1373 |
struct scsi_device *sdev; shost_for_each_device(sdev, shost) { |
b45620229 [SCSI] Add 'eh_de... |
1374 |
if (scsi_host_eh_past_deadline(shost)) { |
b45620229 [SCSI] Add 'eh_de... |
1375 1376 1377 1378 1379 1380 1381 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "skip %s, past eh deadline ", __func__)); break; } |
1da177e4c Linux-2.6.12-rc2 |
1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 |
stu_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && scsi_check_sense(scmd) == FAILED ) { stu_scmd = scmd; break; } if (!stu_scmd) continue; |
91921e016 scsi: use dev_pri... |
1392 1393 1394 1395 1396 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: Sending START_UNIT to sdev: 0x%p ", current->comm, sdev)); |
1da177e4c Linux-2.6.12-rc2 |
1397 1398 1399 1400 |
if (!scsi_eh_try_stu(stu_scmd)) { if (!scsi_device_online(sdev) || !scsi_eh_tur(stu_scmd)) { |
937abeaad [SCSI] use list_f... |
1401 1402 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
2451079bc [SCSI] Fix errati... |
1403 1404 |
if (scmd->device == sdev && scsi_eh_action(scmd, SUCCESS) == SUCCESS) |
1da177e4c Linux-2.6.12-rc2 |
1405 1406 1407 1408 1409 |
scsi_eh_finish_cmd(scmd, done_q); } } } else { SCSI_LOG_ERROR_RECOVERY(3, |
91921e016 scsi: use dev_pri... |
1410 1411 1412 1413 |
shost_printk(KERN_INFO, shost, "%s: START_UNIT failed to sdev:" " 0x%p ", current->comm, sdev)); |
1da177e4c Linux-2.6.12-rc2 |
1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 |
} } return list_empty(work_q); } /** * scsi_eh_bus_device_reset - send bdr if needed * @shost: scsi host being recovered. |
74cf298fe scsi: fix various... |
1424 |
* @work_q: &list_head for pending commands. |
eb44820c2 [SCSI] Add Docume... |
1425 |
* @done_q: &list_head for processed commands. |
1da177e4c Linux-2.6.12-rc2 |
1426 1427 |
* * Notes: |
eb44820c2 [SCSI] Add Docume... |
1428 |
* Try a bus device reset. Still, look to see whether we have multiple |
1da177e4c Linux-2.6.12-rc2 |
1429 1430 |
* devices that are jammed or not - if we have multiple devices, it * makes no sense to try bus_device_reset - we really would need to try |
0bf8c8697 Reduce sequential... |
1431 |
* a bus_reset instead. |
dc8875e10 [SCSI] docbook an... |
1432 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1433 1434 1435 1436 |
static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1437 |
struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
1438 1439 1440 1441 |
struct scsi_device *sdev; int rtn; shost_for_each_device(sdev, shost) { |
b45620229 [SCSI] Add 'eh_de... |
1442 |
if (scsi_host_eh_past_deadline(shost)) { |
b45620229 [SCSI] Add 'eh_de... |
1443 1444 1445 1446 1447 1448 1449 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "skip %s, past eh deadline ", __func__)); break; } |
1da177e4c Linux-2.6.12-rc2 |
1450 1451 1452 1453 1454 1455 1456 1457 1458 |
bdr_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) if (scmd->device == sdev) { bdr_scmd = scmd; break; } if (!bdr_scmd) continue; |
91921e016 scsi: use dev_pri... |
1459 1460 1461 1462 1463 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: Sending BDR sdev: 0x%p ", current->comm, sdev)); |
1da177e4c Linux-2.6.12-rc2 |
1464 |
rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb5876 [SCSI] Allow FC ... |
1465 |
if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4c Linux-2.6.12-rc2 |
1466 |
if (!scsi_device_online(sdev) || |
2f2eb5876 [SCSI] Allow FC ... |
1467 |
rtn == FAST_IO_FAIL || |
1da177e4c Linux-2.6.12-rc2 |
1468 |
!scsi_eh_tur(bdr_scmd)) { |
937abeaad [SCSI] use list_f... |
1469 1470 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
2451079bc [SCSI] Fix errati... |
1471 1472 |
if (scmd->device == sdev && scsi_eh_action(scmd, rtn) != FAILED) |
1da177e4c Linux-2.6.12-rc2 |
1473 1474 1475 1476 1477 |
scsi_eh_finish_cmd(scmd, done_q); } } } else { |
91921e016 scsi: use dev_pri... |
1478 1479 1480 1481 1482 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: BDR failed sdev: 0x%p ", current->comm, sdev)); |
1da177e4c Linux-2.6.12-rc2 |
1483 1484 1485 1486 1487 1488 1489 |
} } return list_empty(work_q); } /** |
30bd7df8c [SCSI] scsi_error... |
1490 1491 |
* scsi_eh_target_reset - send target reset if needed * @shost: scsi host being recovered. |
74cf298fe scsi: fix various... |
1492 |
* @work_q: &list_head for pending commands. |
30bd7df8c [SCSI] scsi_error... |
1493 1494 1495 1496 1497 1498 1499 1500 1501 |
* @done_q: &list_head for processed commands. * * Notes: * Try a target reset. */ static int scsi_eh_target_reset(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { |
98db51957 [SCSI] fix id com... |
1502 |
LIST_HEAD(tmp_list); |
3eef6257d [SCSI] Reduce err... |
1503 |
LIST_HEAD(check_list); |
30bd7df8c [SCSI] scsi_error... |
1504 |
|
98db51957 [SCSI] fix id com... |
1505 1506 1507 1508 1509 1510 |
list_splice_init(work_q, &tmp_list); while (!list_empty(&tmp_list)) { struct scsi_cmnd *next, *scmd; int rtn; unsigned int id; |
b45620229 [SCSI] Add 'eh_de... |
1511 |
|
b45620229 [SCSI] Add 'eh_de... |
1512 |
if (scsi_host_eh_past_deadline(shost)) { |
b45620229 [SCSI] Add 'eh_de... |
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 |
/* push back on work queue for further processing */ list_splice_init(&check_list, work_q); list_splice_init(&tmp_list, work_q); SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "skip %s, past eh deadline ", __func__)); return list_empty(work_q); } |
98db51957 [SCSI] fix id com... |
1523 1524 1525 |
scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); id = scmd_id(scmd); |
30bd7df8c [SCSI] scsi_error... |
1526 |
|
91921e016 scsi: use dev_pri... |
1527 1528 1529 1530 1531 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: Sending target reset to target %d ", current->comm, id)); |
98db51957 [SCSI] fix id com... |
1532 1533 |
rtn = scsi_try_target_reset(scmd); if (rtn != SUCCESS && rtn != FAST_IO_FAIL) |
91921e016 scsi: use dev_pri... |
1534 1535 1536 1537 1538 1539 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: Target reset failed" " target: %d ", current->comm, id)); |
98db51957 [SCSI] fix id com... |
1540 1541 1542 |
list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { if (scmd_id(scmd) != id) continue; |
3eef6257d [SCSI] Reduce err... |
1543 1544 1545 |
if (rtn == SUCCESS) list_move_tail(&scmd->eh_entry, &check_list); else if (rtn == FAST_IO_FAIL) |
98db51957 [SCSI] fix id com... |
1546 1547 1548 1549 1550 1551 |
scsi_eh_finish_cmd(scmd, done_q); else /* push back on work queue for further processing */ list_move(&scmd->eh_entry, work_q); } } |
30bd7df8c [SCSI] scsi_error... |
1552 |
|
3eef6257d [SCSI] Reduce err... |
1553 |
return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8c [SCSI] scsi_error... |
1554 1555 1556 |
} /** |
0bf8c8697 Reduce sequential... |
1557 |
* scsi_eh_bus_reset - send a bus reset |
eb44820c2 [SCSI] Add Docume... |
1558 |
* @shost: &scsi host being recovered. |
74cf298fe scsi: fix various... |
1559 |
* @work_q: &list_head for pending commands. |
eb44820c2 [SCSI] Add Docume... |
1560 |
* @done_q: &list_head for processed commands. |
dc8875e10 [SCSI] docbook an... |
1561 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1562 1563 1564 1565 |
static int scsi_eh_bus_reset(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1566 |
struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257d [SCSI] Reduce err... |
1567 |
LIST_HEAD(check_list); |
1da177e4c Linux-2.6.12-rc2 |
1568 1569 1570 1571 1572 1573 1574 |
unsigned int channel; int rtn; /* * we really want to loop over the various channels, and do this on * a channel by channel basis. we should also check to see if any * of the failed commands are on soft_reset devices, and if so, skip |
0bf8c8697 Reduce sequential... |
1575 |
* the reset. |
1da177e4c Linux-2.6.12-rc2 |
1576 1577 1578 |
*/ for (channel = 0; channel <= shost->max_channel; channel++) { |
b45620229 [SCSI] Add 'eh_de... |
1579 |
if (scsi_host_eh_past_deadline(shost)) { |
b45620229 [SCSI] Add 'eh_de... |
1580 1581 1582 1583 1584 1585 1586 1587 |
list_splice_init(&check_list, work_q); SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "skip %s, past eh deadline ", __func__)); return list_empty(work_q); } |
b45620229 [SCSI] Add 'eh_de... |
1588 |
|
1da177e4c Linux-2.6.12-rc2 |
1589 1590 |
chan_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) { |
422c0d61d [SCSI] use scmd_i... |
1591 |
if (channel == scmd_channel(scmd)) { |
1da177e4c Linux-2.6.12-rc2 |
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 |
chan_scmd = scmd; break; /* * FIXME add back in some support for * soft_reset devices. */ } } if (!chan_scmd) continue; |
91921e016 scsi: use dev_pri... |
1603 1604 1605 1606 1607 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: Sending BRST chan: %d ", current->comm, channel)); |
1da177e4c Linux-2.6.12-rc2 |
1608 |
rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb5876 [SCSI] Allow FC ... |
1609 |
if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaad [SCSI] use list_f... |
1610 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257d [SCSI] Reduce err... |
1611 1612 |
if (channel == scmd_channel(scmd)) { if (rtn == FAST_IO_FAIL) |
1da177e4c Linux-2.6.12-rc2 |
1613 1614 |
scsi_eh_finish_cmd(scmd, done_q); |
3eef6257d [SCSI] Reduce err... |
1615 1616 1617 1618 |
else list_move_tail(&scmd->eh_entry, &check_list); } |
1da177e4c Linux-2.6.12-rc2 |
1619 1620 |
} } else { |
91921e016 scsi: use dev_pri... |
1621 1622 1623 1624 1625 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: BRST failed chan: %d ", current->comm, channel)); |
1da177e4c Linux-2.6.12-rc2 |
1626 1627 |
} } |
3eef6257d [SCSI] Reduce err... |
1628 |
return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4c Linux-2.6.12-rc2 |
1629 1630 1631 |
} /** |
0bf8c8697 Reduce sequential... |
1632 |
* scsi_eh_host_reset - send a host reset |
74cf298fe scsi: fix various... |
1633 1634 1635 |
* @shost: host to be reset. * @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. |
dc8875e10 [SCSI] docbook an... |
1636 |
*/ |
91921e016 scsi: use dev_pri... |
1637 1638 |
static int scsi_eh_host_reset(struct Scsi_Host *shost, struct list_head *work_q, |
1da177e4c Linux-2.6.12-rc2 |
1639 1640 |
struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1641 |
struct scsi_cmnd *scmd, *next; |
3eef6257d [SCSI] Reduce err... |
1642 |
LIST_HEAD(check_list); |
1da177e4c Linux-2.6.12-rc2 |
1643 |
int rtn; |
1da177e4c Linux-2.6.12-rc2 |
1644 1645 1646 1647 |
if (!list_empty(work_q)) { scmd = list_entry(work_q->next, struct scsi_cmnd, eh_entry); |
91921e016 scsi: use dev_pri... |
1648 1649 1650 1651 1652 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: Sending HRST ", current->comm)); |
1da177e4c Linux-2.6.12-rc2 |
1653 1654 |
rtn = scsi_try_host_reset(scmd); |
3eef6257d [SCSI] Reduce err... |
1655 1656 1657 |
if (rtn == SUCCESS) { list_splice_init(work_q, &check_list); } else if (rtn == FAST_IO_FAIL) { |
937abeaad [SCSI] use list_f... |
1658 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4c Linux-2.6.12-rc2 |
1659 1660 1661 |
scsi_eh_finish_cmd(scmd, done_q); } } else { |
91921e016 scsi: use dev_pri... |
1662 1663 1664 1665 1666 |
SCSI_LOG_ERROR_RECOVERY(3, shost_printk(KERN_INFO, shost, "%s: HRST failed ", current->comm)); |
1da177e4c Linux-2.6.12-rc2 |
1667 1668 |
} } |
3eef6257d [SCSI] Reduce err... |
1669 |
return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4c Linux-2.6.12-rc2 |
1670 1671 1672 1673 |
} /** * scsi_eh_offline_sdevs - offline scsi devices that fail to recover |
74cf298fe scsi: fix various... |
1674 1675 |
* @work_q: &list_head for pending commands. * @done_q: &list_head for processed commands. |
dc8875e10 [SCSI] docbook an... |
1676 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1677 1678 1679 |
static void scsi_eh_offline_sdevs(struct list_head *work_q, struct list_head *done_q) { |
937abeaad [SCSI] use list_f... |
1680 |
struct scsi_cmnd *scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
1681 |
|
937abeaad [SCSI] use list_f... |
1682 |
list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d3 [SCSI] Improve er... |
1683 1684 1685 |
sdev_printk(KERN_INFO, scmd->device, "Device offlined - " "not ready after error recovery "); |
1da177e4c Linux-2.6.12-rc2 |
1686 |
scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d16 [SCSI] remove scs... |
1687 |
if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4c Linux-2.6.12-rc2 |
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 |
/* * FIXME: Handle lost cmds. */ } scsi_eh_finish_cmd(scmd, done_q); } return; } /** |
e494f6a72 [SCSI] improved e... |
1698 |
* scsi_noretry_cmd - determine if command should be failed fast |
4a27446f3 [SCSI] modify scs... |
1699 1700 1701 1702 1703 1704 1705 |
* @scmd: SCSI cmd to examine. */ int scsi_noretry_cmd(struct scsi_cmnd *scmd) { switch (host_byte(scmd->result)) { case DID_OK: break; |
e494f6a72 [SCSI] improved e... |
1706 1707 |
case DID_TIME_OUT: goto check_type; |
4a27446f3 [SCSI] modify scs... |
1708 |
case DID_BUS_BUSY: |
33659ebba block: remove wra... |
1709 |
return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f3 [SCSI] modify scs... |
1710 |
case DID_PARITY: |
33659ebba block: remove wra... |
1711 |
return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f3 [SCSI] modify scs... |
1712 1713 1714 1715 1716 1717 |
case DID_ERROR: if (msg_byte(scmd->result) == COMMAND_COMPLETE && status_byte(scmd->result) == RESERVATION_CONFLICT) return 0; /* fall through */ case DID_SOFT_ERROR: |
33659ebba block: remove wra... |
1718 |
return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f3 [SCSI] modify scs... |
1719 |
} |
e494f6a72 [SCSI] improved e... |
1720 1721 |
if (status_byte(scmd->result) != CHECK_CONDITION) return 0; |
4a27446f3 [SCSI] modify scs... |
1722 |
|
e494f6a72 [SCSI] improved e... |
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 |
check_type: /* * assume caller has checked sense and determined * the check condition was retryable. */ if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) return 1; else return 0; |
4a27446f3 [SCSI] modify scs... |
1733 1734 1735 |
} /** |
1da177e4c Linux-2.6.12-rc2 |
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 |
* scsi_decide_disposition - Disposition a cmd on return from LLD. * @scmd: SCSI cmd to examine. * * Notes: * This is *only* called when we are examining the status after sending * out the actual data command. any commands that are queued for error * recovery (e.g. test_unit_ready) do *not* come through here. * * When this routine returns failed, it means the error handler thread * is woken. In cases where the error code indicates an error that * doesn't require the error handler read (i.e. we don't need to * abort/reset), this function should return SUCCESS. |
dc8875e10 [SCSI] docbook an... |
1748 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1749 1750 1751 1752 1753 1754 1755 1756 1757 |
int scsi_decide_disposition(struct scsi_cmnd *scmd) { int rtn; /* * if the device is offline, then we clearly just pass the result back * up to the top level. */ if (!scsi_device_online(scmd->device)) { |
91921e016 scsi: use dev_pri... |
1758 1759 1760 |
SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, "%s: device offline - report as SUCCESS ", __func__)); |
1da177e4c Linux-2.6.12-rc2 |
1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 |
return SUCCESS; } /* * first check the host byte, to see if there is anything in there * that would indicate what we need to do. */ switch (host_byte(scmd->result)) { case DID_PASSTHROUGH: /* * no matter what, pass this through to the upper layer. * nuke this special code so that it looks like we are saying * did_ok. */ scmd->result &= 0xff00ffff; return SUCCESS; case DID_OK: /* * looks good. drop through, and check the next byte. */ break; |
e494f6a72 [SCSI] improved e... |
1782 1783 |
case DID_ABORT: if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { |
8922a9089 scsi_error: fix i... |
1784 |
set_host_byte(scmd, DID_TIME_OUT); |
e494f6a72 [SCSI] improved e... |
1785 1786 |
return SUCCESS; } |
1da177e4c Linux-2.6.12-rc2 |
1787 1788 |
case DID_NO_CONNECT: case DID_BAD_TARGET: |
1da177e4c Linux-2.6.12-rc2 |
1789 1790 1791 1792 1793 1794 1795 1796 |
/* * note - this means that we just report the status back * to the top level driver, not that we actually think * that it indicates SUCCESS. */ return SUCCESS; /* * when the low level driver returns did_soft_error, |
0bf8c8697 Reduce sequential... |
1797 |
* it is responsible for keeping an internal retry counter |
1da177e4c Linux-2.6.12-rc2 |
1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 |
* in order to avoid endless loops (db) * * actually this is a bug in this function here. we should * be mindful of the maximum number of retries specified * and not get stuck in a loop. */ case DID_SOFT_ERROR: goto maybe_retry; case DID_IMM_RETRY: return NEEDS_RETRY; |
bf341919d scsi: add DID_REQ... |
1808 1809 |
case DID_REQUEUE: return ADD_TO_MLQUEUE; |
a4dfaa6f2 [SCSI] scsi: add ... |
1810 1811 1812 1813 1814 |
case DID_TRANSPORT_DISRUPTED: /* * LLD/transport was disrupted during processing of the IO. * The transport class is now blocked/blocking, * and the transport will decide what to do with the IO |
939c2288c [SCSI] scsi_error... |
1815 1816 |
* based on its timers and recovery capablilities if * there are enough retries. |
a4dfaa6f2 [SCSI] scsi: add ... |
1817 |
*/ |
939c2288c [SCSI] scsi_error... |
1818 |
goto maybe_retry; |
a4dfaa6f2 [SCSI] scsi: add ... |
1819 1820 1821 1822 1823 1824 |
case DID_TRANSPORT_FAILFAST: /* * The transport decided to failfast the IO (most likely * the fast io fail tmo fired), so send IO directly upwards. */ return SUCCESS; |
1da177e4c Linux-2.6.12-rc2 |
1825 1826 1827 1828 1829 1830 1831 1832 1833 |
case DID_ERROR: if (msg_byte(scmd->result) == COMMAND_COMPLETE && status_byte(scmd->result) == RESERVATION_CONFLICT) /* * execute reservation conflict processing code * lower down */ break; /* fallthrough */ |
1da177e4c Linux-2.6.12-rc2 |
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 |
case DID_BUS_BUSY: case DID_PARITY: goto maybe_retry; case DID_TIME_OUT: /* * when we scan the bus, we get timeout messages for * these commands if there is no device available. * other hosts report did_no_connect for the same thing. */ if ((scmd->cmnd[0] == TEST_UNIT_READY || scmd->cmnd[0] == INQUIRY)) { return SUCCESS; } else { return FAILED; } case DID_RESET: return SUCCESS; default: return FAILED; } /* * next, check the message byte. */ if (msg_byte(scmd->result) != COMMAND_COMPLETE) return FAILED; /* * check the status byte to see if this indicates anything special. */ switch (status_byte(scmd->result)) { case QUEUE_FULL: |
42a6a9183 [SCSI] scsi error... |
1866 |
scsi_handle_queue_full(scmd->device); |
1da177e4c Linux-2.6.12-rc2 |
1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 |
/* * the case of trying to send too many commands to a * tagged queueing device. */ case BUSY: /* * device can't talk to us at the moment. Should only * occur (SAM-3) when the task queue is empty, so will cause * the empty queue handling to trigger a stall in the * device. */ return ADD_TO_MLQUEUE; case GOOD: |
279afdfe7 [SCSI] Generate u... |
1880 1881 |
if (scmd->cmnd[0] == REPORT_LUNS) scmd->device->sdev_target->expecting_lun_change = 0; |
4a84067db [SCSI] add queue_... |
1882 |
scsi_handle_queue_ramp_up(scmd->device); |
1da177e4c Linux-2.6.12-rc2 |
1883 |
case COMMAND_TERMINATED: |
1da177e4c Linux-2.6.12-rc2 |
1884 |
return SUCCESS; |
a9b589d90 [SCSI] scsi_error... |
1885 1886 |
case TASK_ABORTED: goto maybe_retry; |
1da177e4c Linux-2.6.12-rc2 |
1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 |
case CHECK_CONDITION: rtn = scsi_check_sense(scmd); if (rtn == NEEDS_RETRY) goto maybe_retry; /* if rtn == FAILED, we have no sense information; * returning FAILED will wake the error handler thread * to collect the sense and redo the decide * disposition */ return rtn; case CONDITION_GOOD: case INTERMEDIATE_GOOD: case INTERMEDIATE_C_GOOD: case ACA_ACTIVE: /* * who knows? FIXME(eric) */ return SUCCESS; case RESERVATION_CONFLICT: |
9ccfc756a [SCSI] move the m... |
1906 1907 1908 |
sdev_printk(KERN_INFO, scmd->device, "reservation conflict "); |
2082ebc45 [SCSI] fix the ne... |
1909 |
set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4c Linux-2.6.12-rc2 |
1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 |
return SUCCESS; /* causes immediate i/o error */ default: return FAILED; } return FAILED; maybe_retry: /* we requeue for retry because the error was retryable, and * the request was not marked fast fail. Note that above, * even if the request is marked fast fail, we still requeue * for queue congestion conditions (QUEUE_FULL or BUSY) */ |
8884efab1 [SCSI] scsi: scsi... |
1922 |
if ((++scmd->retries) <= scmd->allowed |
4a27446f3 [SCSI] modify scs... |
1923 |
&& !scsi_noretry_cmd(scmd)) { |
1da177e4c Linux-2.6.12-rc2 |
1924 1925 1926 1927 1928 1929 1930 1931 |
return NEEDS_RETRY; } else { /* * no more retries - report this one back to upper level. */ return SUCCESS; } } |
f078727b2 [SCSI] remove scs... |
1932 1933 1934 1935 |
static void eh_lock_door_done(struct request *req, int uptodate) { __blk_put_request(req->q, req); } |
1da177e4c Linux-2.6.12-rc2 |
1936 |
/** |
1da177e4c Linux-2.6.12-rc2 |
1937 1938 1939 1940 |
* scsi_eh_lock_door - Prevent medium removal for the specified device * @sdev: SCSI device to prevent medium removal * * Locking: |
91bc31fb3 [SCSI] fix up scs... |
1941 |
* We must be called from process context. |
1da177e4c Linux-2.6.12-rc2 |
1942 1943 1944 1945 |
* * Notes: * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the * head of the devices request queue, and continue. |
dc8875e10 [SCSI] docbook an... |
1946 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1947 1948 |
static void scsi_eh_lock_door(struct scsi_device *sdev) { |
f078727b2 [SCSI] remove scs... |
1949 |
struct request *req; |
1da177e4c Linux-2.6.12-rc2 |
1950 |
|
91bc31fb3 [SCSI] fix up scs... |
1951 1952 1953 1954 |
/* * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a * request becomes available */ |
f078727b2 [SCSI] remove scs... |
1955 |
req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
a492f0754 block,scsi: fixup... |
1956 |
if (IS_ERR(req)) |
eb571eead block,scsi: verif... |
1957 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1958 |
|
f27b087b8 block: add blk_rq... |
1959 |
blk_rq_set_block_pc(req); |
f078727b2 [SCSI] remove scs... |
1960 1961 1962 1963 1964 1965 |
req->cmd[0] = ALLOW_MEDIUM_REMOVAL; req->cmd[1] = 0; req->cmd[2] = 0; req->cmd[3] = 0; req->cmd[4] = SCSI_REMOVAL_PREVENT; req->cmd[5] = 0; |
1da177e4c Linux-2.6.12-rc2 |
1966 |
|
f078727b2 [SCSI] remove scs... |
1967 |
req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
f078727b2 [SCSI] remove scs... |
1968 1969 1970 1971 1972 1973 |
req->cmd_flags |= REQ_QUIET; req->timeout = 10 * HZ; req->retries = 5; blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); } |
1da177e4c Linux-2.6.12-rc2 |
1974 1975 1976 1977 1978 1979 1980 1981 |
/** * scsi_restart_operations - restart io operations to the specified host. * @shost: Host we are restarting. * * Notes: * When we entered the error handler, we blocked all further i/o to * this device. we need to 'reverse' this process. |
dc8875e10 [SCSI] docbook an... |
1982 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
1983 1984 1985 |
static void scsi_restart_operations(struct Scsi_Host *shost) { struct scsi_device *sdev; |
939647ee3 [SCSI] fix oops o... |
1986 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
1987 1988 1989 1990 1991 1992 1993 |
/* * If the door was locked, we need to insert a door lock request * onto the head of the SCSI request queue for the device. There * is no point trying to lock the door of an off-line device. */ shost_for_each_device(sdev, shost) { |
48379270f scsi: only re-loc... |
1994 |
if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
1da177e4c Linux-2.6.12-rc2 |
1995 |
scsi_eh_lock_door(sdev); |
48379270f scsi: only re-loc... |
1996 1997 |
sdev->was_reset = 0; } |
1da177e4c Linux-2.6.12-rc2 |
1998 1999 2000 2001 2002 2003 2004 |
} /* * next free up anything directly waiting upon the host. this * will be requests for character device operations, and also for * ioctls to queued block devices. */ |
b45620229 [SCSI] Add 'eh_de... |
2005 |
SCSI_LOG_ERROR_RECOVERY(3, |
91921e016 scsi: use dev_pri... |
2006 2007 |
shost_printk(KERN_INFO, shost, "waking up host to restart ")); |
1da177e4c Linux-2.6.12-rc2 |
2008 |
|
939647ee3 [SCSI] fix oops o... |
2009 2010 2011 2012 2013 |
spin_lock_irqsave(shost->host_lock, flags); if (scsi_host_set_state(shost, SHOST_RUNNING)) if (scsi_host_set_state(shost, SHOST_CANCEL)) BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); spin_unlock_irqrestore(shost->host_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 |
wake_up(&shost->host_wait); /* * finally we need to re-initiate requests that may be pending. we will * have had everything blocked while error handling is taking place, and * now that error recovery is done, we will need to ensure that these * requests are started. */ scsi_run_host_queues(shost); |
57fc2e335 [SCSI] fix eh wak... |
2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 |
/* * if eh is active and host_eh_scheduled is pending we need to re-run * recovery. we do this check after scsi_run_host_queues() to allow * everything pent up since the last eh run a chance to make forward * progress before we sync again. Either we'll immediately re-run * recovery or scsi_device_unbusy() will wake us again when these * pending commands complete. */ spin_lock_irqsave(shost->host_lock, flags); if (shost->host_eh_scheduled) if (scsi_host_set_state(shost, SHOST_RECOVERY)) WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); spin_unlock_irqrestore(shost->host_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
2038 2039 2040 2041 |
} /** * scsi_eh_ready_devs - check device ready state and recover if not. |
74cf298fe scsi: fix various... |
2042 2043 |
* @shost: host to be recovered. * @work_q: &list_head for pending commands. |
eb44820c2 [SCSI] Add Docume... |
2044 |
* @done_q: &list_head for processed commands. |
dc8875e10 [SCSI] docbook an... |
2045 |
*/ |
dca84e469 [SCSI] scsi_error... |
2046 2047 2048 |
void scsi_eh_ready_devs(struct Scsi_Host *shost, struct list_head *work_q, struct list_head *done_q) |
1da177e4c Linux-2.6.12-rc2 |
2049 2050 2051 |
{ if (!scsi_eh_stu(shost, work_q, done_q)) if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) |
30bd7df8c [SCSI] scsi_error... |
2052 2053 |
if (!scsi_eh_target_reset(shost, work_q, done_q)) if (!scsi_eh_bus_reset(shost, work_q, done_q)) |
91921e016 scsi: use dev_pri... |
2054 |
if (!scsi_eh_host_reset(shost, work_q, done_q)) |
30bd7df8c [SCSI] scsi_error... |
2055 2056 |
scsi_eh_offline_sdevs(work_q, done_q); |
1da177e4c Linux-2.6.12-rc2 |
2057 |
} |
dca84e469 [SCSI] scsi_error... |
2058 |
EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4c Linux-2.6.12-rc2 |
2059 2060 2061 2062 |
/** * scsi_eh_flush_done_q - finish processed commands or retry them. * @done_q: list_head of processed commands. |
dc8875e10 [SCSI] docbook an... |
2063 |
*/ |
041c5fc33 [PATCH] SCSI: exp... |
2064 |
void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4c Linux-2.6.12-rc2 |
2065 |
{ |
937abeaad [SCSI] use list_f... |
2066 |
struct scsi_cmnd *scmd, *next; |
1da177e4c Linux-2.6.12-rc2 |
2067 |
|
937abeaad [SCSI] use list_f... |
2068 2069 |
list_for_each_entry_safe(scmd, next, done_q, eh_entry) { list_del_init(&scmd->eh_entry); |
1da177e4c Linux-2.6.12-rc2 |
2070 |
if (scsi_device_online(scmd->device) && |
4a27446f3 [SCSI] modify scs... |
2071 |
!scsi_noretry_cmd(scmd) && |
8884efab1 [SCSI] scsi: scsi... |
2072 |
(++scmd->retries <= scmd->allowed)) { |
91921e016 scsi: use dev_pri... |
2073 2074 2075 2076 2077 |
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "%s: flush retry cmd: %p ", current->comm, scmd)); |
1da177e4c Linux-2.6.12-rc2 |
2078 2079 |
scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); } else { |
793698ce2 [SCSI] saved and ... |
2080 2081 2082 2083 2084 |
/* * If just we got sense for the device (called * scsi_eh_get_sense), scmd->result is already * set, do not set DRIVER_TIMEOUT. */ |
1da177e4c Linux-2.6.12-rc2 |
2085 2086 |
if (!scmd->result) scmd->result |= (DRIVER_TIMEOUT << 24); |
91921e016 scsi: use dev_pri... |
2087 2088 2089 2090 2091 |
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "%s: flush finish cmd: %p ", current->comm, scmd)); |
1da177e4c Linux-2.6.12-rc2 |
2092 2093 2094 2095 |
scsi_finish_command(scmd); } } } |
041c5fc33 [PATCH] SCSI: exp... |
2096 |
EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4c Linux-2.6.12-rc2 |
2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 |
/** * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. * @shost: Host to unjam. * * Notes: * When we come in here, we *know* that all commands on the bus have * either completed, failed or timed out. we also know that no further * commands are being sent to the host, so things are relatively quiet * and we have freedom to fiddle with things as we wish. * * This is only the *default* implementation. it is possible for * individual drivers to supply their own version of this function, and * if the maintainer wishes to do this, it is strongly suggested that * this function be taken as a template and modified. this function * was designed to correctly handle problems for about 95% of the * different cases out there, and it should always provide at least a * reasonable amount of error recovery. * * Any command marked 'failed' or 'timeout' must eventually have * scsi_finish_cmd() called for it. we do all of the retry stuff * here, so when we restart the host after we return it should have an * empty queue. |
dc8875e10 [SCSI] docbook an... |
2120 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 |
static void scsi_unjam_host(struct Scsi_Host *shost) { unsigned long flags; LIST_HEAD(eh_work_q); LIST_HEAD(eh_done_q); spin_lock_irqsave(shost->host_lock, flags); list_splice_init(&shost->eh_cmd_q, &eh_work_q); spin_unlock_irqrestore(shost->host_lock, flags); SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); |
b45620229 [SCSI] Add 'eh_de... |
2136 |
spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a3 [SCSI] Set the mi... |
2137 |
if (shost->eh_deadline != -1) |
b45620229 [SCSI] Add 'eh_de... |
2138 2139 |
shost->last_reset = 0; spin_unlock_irqrestore(shost->host_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
2140 2141 2142 2143 |
scsi_eh_flush_done_q(&eh_done_q); } /** |
ad42eb1b7 [SCSI] tidy up sc... |
2144 |
* scsi_error_handler - SCSI error handler thread |
1da177e4c Linux-2.6.12-rc2 |
2145 2146 2147 |
* @data: Host for which we are running. * * Notes: |
ad42eb1b7 [SCSI] tidy up sc... |
2148 2149 |
* This is the main error handling loop. This is run as a kernel thread * for every SCSI host and handles all error handling activity. |
dc8875e10 [SCSI] docbook an... |
2150 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2151 2152 |
int scsi_error_handler(void *data) { |
ad42eb1b7 [SCSI] tidy up sc... |
2153 |
struct Scsi_Host *shost = data; |
1da177e4c Linux-2.6.12-rc2 |
2154 |
|
1da177e4c Linux-2.6.12-rc2 |
2155 |
/* |
ad42eb1b7 [SCSI] tidy up sc... |
2156 2157 2158 |
* We use TASK_INTERRUPTIBLE so that the thread is not * counted against the load average as a running process. * We never actually get interrupted because kthread_run |
c03264a79 trivial: fix sing... |
2159 |
* disables signal delivery for the created thread. |
1da177e4c Linux-2.6.12-rc2 |
2160 |
*/ |
3ed7a4704 [SCSI] Fix thread... |
2161 |
while (!kthread_should_stop()) { |
b9d5c6b7e [SCSI] cleanup se... |
2162 |
set_current_state(TASK_INTERRUPTIBLE); |
ee7863bc6 [PATCH] SCSI: imp... |
2163 |
if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
746650160 scsi: convert hos... |
2164 |
shost->host_failed != atomic_read(&shost->host_busy)) { |
ad42eb1b7 [SCSI] tidy up sc... |
2165 |
SCSI_LOG_ERROR_RECOVERY(1, |
91921e016 scsi: use dev_pri... |
2166 2167 2168 2169 |
shost_printk(KERN_INFO, shost, "scsi_eh_%d: sleeping ", shost->host_no)); |
3ed7a4704 [SCSI] Fix thread... |
2170 |
schedule(); |
3ed7a4704 [SCSI] Fix thread... |
2171 2172 |
continue; } |
1da177e4c Linux-2.6.12-rc2 |
2173 |
|
3ed7a4704 [SCSI] Fix thread... |
2174 |
__set_current_state(TASK_RUNNING); |
ad42eb1b7 [SCSI] tidy up sc... |
2175 |
SCSI_LOG_ERROR_RECOVERY(1, |
91921e016 scsi: use dev_pri... |
2176 2177 2178 2179 |
shost_printk(KERN_INFO, shost, "scsi_eh_%d: waking up %d/%d/%d ", shost->host_no, shost->host_eh_scheduled, |
746650160 scsi: convert hos... |
2180 2181 |
shost->host_failed, atomic_read(&shost->host_busy))); |
1da177e4c Linux-2.6.12-rc2 |
2182 |
|
1da177e4c Linux-2.6.12-rc2 |
2183 2184 2185 2186 2187 |
/* * We have a host that is failing for some reason. Figure out * what we need to do to get it up and online again (if we can). * If we fail, we end up taking the thing offline. */ |
ae0751ffc [SCSI] add flag t... |
2188 |
if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f24014 [SCSI] implement ... |
2189 2190 2191 2192 2193 2194 2195 |
SCSI_LOG_ERROR_RECOVERY(1, printk(KERN_ERR "Error handler scsi_eh_%d " "unable to autoresume ", shost->host_no)); continue; } |
9227c33de [PATCH] move ->eh... |
2196 2197 |
if (shost->transportt->eh_strategy_handler) shost->transportt->eh_strategy_handler(shost); |
1da177e4c Linux-2.6.12-rc2 |
2198 2199 |
else scsi_unjam_host(shost); |
1da177e4c Linux-2.6.12-rc2 |
2200 2201 2202 2203 2204 2205 2206 2207 |
/* * Note - if the above fails completely, the action is to take * individual devices offline and flush the queue of any * outstanding requests that may have been pending. When we * restart, we restart any I/O to any other devices on the bus * which are still online. */ scsi_restart_operations(shost); |
ae0751ffc [SCSI] add flag t... |
2208 2209 |
if (!shost->eh_noresume) scsi_autopm_put_host(shost); |
1da177e4c Linux-2.6.12-rc2 |
2210 |
} |
461a0ffbe [PATCH] scsi_erro... |
2211 |
__set_current_state(TASK_RUNNING); |
ad42eb1b7 [SCSI] tidy up sc... |
2212 |
SCSI_LOG_ERROR_RECOVERY(1, |
91921e016 scsi: use dev_pri... |
2213 2214 2215 2216 |
shost_printk(KERN_INFO, shost, "Error handler scsi_eh_%d exiting ", shost->host_no)); |
3ed7a4704 [SCSI] Fix thread... |
2217 |
shost->ehandler = NULL; |
1da177e4c Linux-2.6.12-rc2 |
2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 |
return 0; } /* * Function: scsi_report_bus_reset() * * Purpose: Utility function used by low-level drivers to report that * they have observed a bus reset on the bus being handled. * * Arguments: shost - Host in question * channel - channel on which reset was observed. * * Returns: Nothing * * Lock status: Host lock must be held. * * Notes: This only needs to be called if the reset is one which * originates from an unknown location. Resets originated * by the mid-level itself don't need to call this, but there * should be no harm. * * The main purpose of this is to make sure that a CHECK_CONDITION * is properly treated. */ void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) { struct scsi_device *sdev; __shost_for_each_device(sdev, shost) { |
30bd7df8c [SCSI] scsi_error... |
2247 2248 |
if (channel == sdev_channel(sdev)) __scsi_report_device_reset(sdev, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 |
} } EXPORT_SYMBOL(scsi_report_bus_reset); /* * Function: scsi_report_device_reset() * * Purpose: Utility function used by low-level drivers to report that * they have observed a device reset on the device being handled. * * Arguments: shost - Host in question * channel - channel on which reset was observed * target - target on which reset was observed * * Returns: Nothing * * Lock status: Host lock must be held * * Notes: This only needs to be called if the reset is one which * originates from an unknown location. Resets originated * by the mid-level itself don't need to call this, but there * should be no harm. * * The main purpose of this is to make sure that a CHECK_CONDITION * is properly treated. */ void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) { struct scsi_device *sdev; __shost_for_each_device(sdev, shost) { |
422c0d61d [SCSI] use scmd_i... |
2280 |
if (channel == sdev_channel(sdev) && |
30bd7df8c [SCSI] scsi_error... |
2281 2282 |
target == sdev_id(sdev)) __scsi_report_device_reset(sdev, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 |
} } EXPORT_SYMBOL(scsi_report_device_reset); static void scsi_reset_provider_done_command(struct scsi_cmnd *scmd) { } /* * Function: scsi_reset_provider * * Purpose: Send requested reset to a bus or device at any phase. * * Arguments: device - device to send reset to * flag - reset type (see scsi.h) * * Returns: SUCCESS/FAILURE. * * Notes: This is used by the SCSI Generic driver to provide * Bus/Device reset capability. */ int scsi_reset_provider(struct scsi_device *dev, int flag) { |
bc4f24014 [SCSI] implement ... |
2308 |
struct scsi_cmnd *scmd; |
d7a1bb0a0 [SCSI] Block I/O ... |
2309 |
struct Scsi_Host *shost = dev->host; |
1da177e4c Linux-2.6.12-rc2 |
2310 |
struct request req; |
d7a1bb0a0 [SCSI] Block I/O ... |
2311 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
2312 |
int rtn; |
bc4f24014 [SCSI] implement ... |
2313 2314 |
if (scsi_autopm_get_host(shost) < 0) return FAILED; |
047963368 [SCSI] do not man... |
2315 2316 2317 2318 |
if (!get_device(&dev->sdev_gendev)) { rtn = FAILED; goto out_put_autopm_host; } |
bc4f24014 [SCSI] implement ... |
2319 |
scmd = scsi_get_command(dev, GFP_KERNEL); |
95eeb5f58 scsi: handle comm... |
2320 2321 2322 2323 2324 |
if (!scmd) { rtn = FAILED; put_device(&dev->sdev_gendev); goto out_put_autopm_host; } |
4f54eec83 block: use blk_rq... |
2325 |
blk_rq_init(NULL, &req); |
1da177e4c Linux-2.6.12-rc2 |
2326 |
scmd->request = &req; |
b4edcbcaf [SCSI] remove scs... |
2327 |
|
64a87b244 [SCSI] Let scsi_c... |
2328 |
scmd->cmnd = req.cmd; |
1da177e4c Linux-2.6.12-rc2 |
2329 |
scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b2 [SCSI] implement ... |
2330 |
memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4c Linux-2.6.12-rc2 |
2331 2332 2333 2334 |
scmd->cmd_len = 0; scmd->sc_data_direction = DMA_BIDIRECTIONAL; |
1da177e4c Linux-2.6.12-rc2 |
2335 |
|
d7a1bb0a0 [SCSI] Block I/O ... |
2336 2337 2338 |
spin_lock_irqsave(shost->host_lock, flags); shost->tmf_in_progress = 1; spin_unlock_irqrestore(shost->host_lock, flags); |
1da177e4c Linux-2.6.12-rc2 |
2339 2340 2341 2342 2343 2344 |
switch (flag) { case SCSI_TRY_RESET_DEVICE: rtn = scsi_try_bus_device_reset(scmd); if (rtn == SUCCESS) break; /* FALLTHROUGH */ |
30bd7df8c [SCSI] scsi_error... |
2345 2346 2347 2348 2349 |
case SCSI_TRY_RESET_TARGET: rtn = scsi_try_target_reset(scmd); if (rtn == SUCCESS) break; /* FALLTHROUGH */ |
1da177e4c Linux-2.6.12-rc2 |
2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 |
case SCSI_TRY_RESET_BUS: rtn = scsi_try_bus_reset(scmd); if (rtn == SUCCESS) break; /* FALLTHROUGH */ case SCSI_TRY_RESET_HOST: rtn = scsi_try_host_reset(scmd); break; default: rtn = FAILED; } |
d7a1bb0a0 [SCSI] Block I/O ... |
2361 2362 2363 2364 2365 2366 2367 2368 2369 |
spin_lock_irqsave(shost->host_lock, flags); shost->tmf_in_progress = 0; spin_unlock_irqrestore(shost->host_lock, flags); /* * be sure to wake up anyone who was sleeping or had their queue * suspended while we performed the TMF. */ SCSI_LOG_ERROR_RECOVERY(3, |
91921e016 scsi: use dev_pri... |
2370 2371 2372 |
shost_printk(KERN_INFO, shost, "waking up host to restart after TMF ")); |
d7a1bb0a0 [SCSI] Block I/O ... |
2373 2374 2375 2376 |
wake_up(&shost->host_wait); scsi_run_host_queues(shost); |
1da177e4c Linux-2.6.12-rc2 |
2377 |
scsi_next_command(scmd); |
047963368 [SCSI] do not man... |
2378 |
out_put_autopm_host: |
bc4f24014 [SCSI] implement ... |
2379 |
scsi_autopm_put_host(shost); |
1da177e4c Linux-2.6.12-rc2 |
2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 |
return rtn; } EXPORT_SYMBOL(scsi_reset_provider); /** * scsi_normalize_sense - normalize main elements from either fixed or * descriptor sense data format into a common format. * * @sense_buffer: byte array containing sense data returned by device * @sb_len: number of valid bytes in sense_buffer * @sshdr: pointer to instance of structure that common * elements are written to. * * Notes: * The "main elements" from sense data are: response_code, sense_key, * asc, ascq and additional_length (only for descriptor format). * * Typically this function can be called after a device has * responded to a SCSI command with the CHECK_CONDITION status. * * Return value: * 1 if valid sense data information found, else 0; |
dc8875e10 [SCSI] docbook an... |
2402 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2403 2404 2405 |
int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, struct scsi_sense_hdr *sshdr) { |
33aa687db [SCSI] convert SP... |
2406 |
if (!sense_buffer || !sb_len) |
1da177e4c Linux-2.6.12-rc2 |
2407 2408 2409 2410 2411 |
return 0; memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); sshdr->response_code = (sense_buffer[0] & 0x7f); |
33aa687db [SCSI] convert SP... |
2412 2413 2414 |
if (!scsi_sense_valid(sshdr)) return 0; |
1da177e4c Linux-2.6.12-rc2 |
2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 |
if (sshdr->response_code >= 0x72) { /* * descriptor format */ if (sb_len > 1) sshdr->sense_key = (sense_buffer[1] & 0xf); if (sb_len > 2) sshdr->asc = sense_buffer[2]; if (sb_len > 3) sshdr->ascq = sense_buffer[3]; if (sb_len > 7) sshdr->additional_length = sense_buffer[7]; } else { |
0bf8c8697 Reduce sequential... |
2428 |
/* |
1da177e4c Linux-2.6.12-rc2 |
2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 |
* fixed format */ if (sb_len > 2) sshdr->sense_key = (sense_buffer[2] & 0xf); if (sb_len > 7) { sb_len = (sb_len < (sense_buffer[7] + 8)) ? sb_len : (sense_buffer[7] + 8); if (sb_len > 12) sshdr->asc = sense_buffer[12]; if (sb_len > 13) sshdr->ascq = sense_buffer[13]; } } return 1; } EXPORT_SYMBOL(scsi_normalize_sense); |
1da177e4c Linux-2.6.12-rc2 |
2446 2447 2448 2449 |
int scsi_command_normalize_sense(struct scsi_cmnd *cmd, struct scsi_sense_hdr *sshdr) { return scsi_normalize_sense(cmd->sense_buffer, |
b80ca4f7e [SCSI] replace si... |
2450 |
SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4c Linux-2.6.12-rc2 |
2451 2452 2453 2454 |
} EXPORT_SYMBOL(scsi_command_normalize_sense); /** |
eb44820c2 [SCSI] Add Docume... |
2455 |
* scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4c Linux-2.6.12-rc2 |
2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 |
* @sense_buffer: byte array of descriptor format sense data * @sb_len: number of valid bytes in sense_buffer * @desc_type: value of descriptor type to find * (e.g. 0 -> information) * * Notes: * only valid when sense data is in descriptor format * * Return value: * pointer to start of (first) descriptor if found else NULL |
dc8875e10 [SCSI] docbook an... |
2466 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 |
const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, int desc_type) { int add_sen_len, add_len, desc_len, k; const u8 * descp; if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) return NULL; if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) return NULL; add_sen_len = (add_sen_len < (sb_len - 8)) ? add_sen_len : (sb_len - 8); descp = &sense_buffer[8]; for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { descp += desc_len; add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; desc_len = add_len + 2; if (descp[0] == desc_type) return descp; if (add_len < 0) // short descriptor ?? break; } return NULL; } EXPORT_SYMBOL(scsi_sense_desc_find); /** |
eb44820c2 [SCSI] Add Docume... |
2494 |
* scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4c Linux-2.6.12-rc2 |
2495 2496 2497 2498 2499 2500 2501 |
* @sense_buffer: byte array of sense data * @sb_len: number of valid bytes in sense_buffer * @info_out: pointer to 64 integer where 8 or 4 byte information * field will be placed if found. * * Return value: * 1 if information field found, 0 if not found. |
dc8875e10 [SCSI] docbook an... |
2502 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 |
int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, u64 * info_out) { int j; const u8 * ucp; u64 ull; if (sb_len < 7) return 0; switch (sense_buffer[0] & 0x7f) { case 0x70: case 0x71: if (sense_buffer[0] & 0x80) { *info_out = (sense_buffer[3] << 24) + (sense_buffer[4] << 16) + (sense_buffer[5] << 8) + sense_buffer[6]; return 1; } else return 0; case 0x72: case 0x73: ucp = scsi_sense_desc_find(sense_buffer, sb_len, 0 /* info desc */); if (ucp && (0xa == ucp[1])) { ull = 0; for (j = 0; j < 8; ++j) { if (j > 0) ull <<= 8; ull |= ucp[4 + j]; } *info_out = ull; return 1; } else return 0; default: return 0; } } EXPORT_SYMBOL(scsi_get_sense_info_fld); |
3bc6a2619 [SCSI] add scsi_b... |
2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 |
/** * scsi_build_sense_buffer - build sense data in a buffer * @desc: Sense format (non zero == descriptor format, * 0 == fixed format) * @buf: Where to build sense data * @key: Sense key * @asc: Additional sense code * @ascq: Additional sense code qualifier * **/ void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) { if (desc) { buf[0] = 0x72; /* descriptor, current */ buf[1] = key; buf[2] = asc; buf[3] = ascq; buf[7] = 0; } else { buf[0] = 0x70; /* fixed, current */ buf[2] = key; buf[7] = 0xa; buf[12] = asc; buf[13] = ascq; } } EXPORT_SYMBOL(scsi_build_sense_buffer); |