Release 4.11 drivers/scsi/scsi_error.c

/*
 *  scsi_error.c Copyright (C) 1997 Eric Youngdale
 *
 *  SCSI error/timeout handling
 *      Initial versions: Eric Youngdale.  Based upon conversations with
 *                        Leonard Zubkoff and David Miller at Linux Expo,
 *                        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
 *      minor cleanups.
 *      September 30, 2002 Mike Anderson (andmike@us.ibm.com)
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/gfp.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/jiffies.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_common.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsi_dh.h>
#include <scsi/sg.h>

#include "scsi_priv.h"
#include "scsi_logging.h"
#include "scsi_transport_api.h"

#include <trace/events/scsi.h>

static void scsi_eh_done(struct scsi_cmnd *scmd);

/*
 * 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)

static int scsi_eh_try_stu(struct scsi_cmnd *scmd);
static int scsi_try_to_abort_cmd(struct scsi_host_template *,
				 struct scsi_cmnd *);

/* called with shost->host_lock held */


void scsi_eh_wakeup(struct Scsi_Host *shost)
{
	if (atomic_read(&shost->host_busy) == shost->host_failed) {
		trace_scsi_eh_wakeup(shost);
		wake_up_process(shost->ehandler);
		SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost,
			"Waking error handler thread\n"));
	}
}

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5
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1
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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.
 */


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);
}
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EXPORT_SYMBOL_GPL(scsi_schedule_eh);



static int scsi_host_eh_past_deadline(struct Scsi_Host *shost)
{
	if (!shost->last_reset || shost->eh_deadline == -1)
		return 0;

	/*
         * 32bit accesses are guaranteed to be atomic
         * (on all supported architectures), so instead
         * of using a spinlock we can as well double check
         * if eh_deadline has been set to 'off' during the
         * time_before call.
         */
	if (time_before(jiffies, shost->last_reset + shost->eh_deadline) &&
	    shost->eh_deadline > -1)
		return 0;

	return 1;
}

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3
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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;
	int rtn;

	if (scsi_host_eh_past_deadline(sdev->host)) {
		SCSI_LOG_ERROR_RECOVERY(3,
			scmd_printk(KERN_INFO, scmd,
				    "eh timeout, not aborting\n"));
	} else {
		SCSI_LOG_ERROR_RECOVERY(3,
			scmd_printk(KERN_INFO, scmd,
				    "aborting command\n"));
		rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd);
		if (rtn == SUCCESS) {
			set_host_byte(scmd, DID_TIME_OUT);
			if (scsi_host_eh_past_deadline(sdev->host)) {
				SCSI_LOG_ERROR_RECOVERY(3,
					scmd_printk(KERN_INFO, scmd,
						    "eh timeout, not retrying "
						    "aborted command\n"));
			} else if (!scsi_noretry_cmd(scmd) &&
			    (++scmd->retries <= scmd->allowed)) {
				SCSI_LOG_ERROR_RECOVERY(3,
					scmd_printk(KERN_WARNING, scmd,
						    "retry aborted command\n"));
				scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY);
				return;
			} else {
				SCSI_LOG_ERROR_RECOVERY(3,
					scmd_printk(KERN_WARNING, scmd,
						    "finish aborted command\n"));
				scsi_finish_command(scmd);
				return;
			}
		} else {
			SCSI_LOG_ERROR_RECOVERY(3,
				scmd_printk(KERN_INFO, scmd,
					    "cmd abort %s\n",
					    (rtn == FAST_IO_FAIL) ?
					    "not send" : "failed"));
		}
	}

	if (!scsi_eh_scmd_add(scmd, 0)) {
		SCSI_LOG_ERROR_RECOVERY(3,
			scmd_printk(KERN_WARNING, scmd,
				    "terminate aborted command\n"));
		set_host_byte(scmd, DID_TIME_OUT);
		scsi_finish_command(scmd);
	}
}

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8
3.00%
1
20.00%
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267
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5
100.00%

/**
 * 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.
                 */
		scmd->eh_eflags &= ~SCSI_EH_ABORT_SCHEDULED;
		SCSI_LOG_ERROR_RECOVERY(3,
			scmd_printk(KERN_INFO, scmd,
				    "previous abort failed\n"));
		BUG_ON(delayed_work_pending(&scmd->abort_work));
		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,
				    "not aborting, host in recovery\n"));
		return FAILED;
	}

	if (shost->eh_deadline != -1 && !shost->last_reset)
		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, "abort scheduled\n"));
	queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100);
	return SUCCESS;
}

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8
4.17%
1
11.11%
Bart Van Assche
4
2.08%
1
11.11%
Ren Mingxin
3
1.56%
1
11.11%
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9
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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.
 */


int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
{
	struct Scsi_Host *shost = scmd->device->host;
	unsigned long flags;
	int ret = 0;

	if (!shost->ehandler)
		return 0;

	spin_lock_irqsave(shost->host_lock, flags);
	if (scsi_host_set_state(shost, SHOST_RECOVERY))
		if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY))
			goto out_unlock;

	if (shost->eh_deadline != -1 && !shost->last_reset)
		shost->last_reset = jiffies;

	ret = 1;
	if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED)
		eh_flag &= ~SCSI_EH_CANCEL_CMD;
	scmd->eh_eflags |= eh_flag;
	list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q);
	shost->host_failed++;
	scsi_eh_wakeup(shost);
 out_unlock:
	spin_unlock_irqrestore(shost->host_lock, flags);
	return ret;
}

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19.61%
2
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4
2.61%
2
22.22%
Ren Mingxin
3
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1
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9
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/**
 * scsi_times_out - Timeout function for normal scsi commands.
 * @req:        request that is timing out.
 *
 * 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.
 */


enum blk_eh_timer_return scsi_times_out(struct request *req)
{
	struct scsi_cmnd *scmd = req->special;
	enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED;
	struct Scsi_Host *host = scmd->device->host;

	trace_scsi_dispatch_cmd_timeout(scmd);
	scsi_log_completion(scmd, TIMEOUT_ERROR);

	if (host->eh_deadline != -1 && !host->last_reset)
		host->last_reset = jiffies;

	if (host->hostt->eh_timed_out)
		rtn = host->hostt->eh_timed_out(scmd);

	if (rtn == BLK_EH_NOT_HANDLED) {
		if (!host->hostt->no_async_abort &&
		    scsi_abort_command(scmd) == SUCCESS)
			return BLK_EH_NOT_HANDLED;

		set_host_byte(scmd, DID_TIME_OUT);
		if (!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))
			rtn = BLK_EH_HANDLED;
	}

	return rtn;
}

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11
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1
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Linus Torvalds (pre-git)
10
7.19%
1
5.56%
Christoph Hellwig
8
5.76%
2
11.11%
Mike Anderson
8
5.76%
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Patrick Mansfield
7
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2
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Keiichiro Tokunaga
5
3.60%
1
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Ulrich Obergfell
4
2.88%
1
5.56%
Ren Mingxin
3
2.16%
1
5.56%
Martin K. Petersen
3
2.16%
1
5.56%
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18
100.00%

/**
 * 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.
 */


int scsi_block_when_processing_errors(struct scsi_device *sdev)
{
	int online;

	wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host));

	online = scsi_device_online(sdev);

	SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev,
		"%s: rtn: %d\n", __func__, online));

	return online;
}
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3.45%
1
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1
1.72%
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58
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10
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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.
 */


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;
				if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD)
					++cmd_cancel;
				else
					++cmd_failed;
			}
		}

		if (cmd_cancel || cmd_failed) {
			SCSI_LOG_ERROR_RECOVERY(3,
				shost_printk(KERN_INFO, shost,
					    "%s: cmds failed: %d, cancel: %d\n",
					    __func__, cmd_failed,
					    cmd_cancel));
			cmd_cancel = 0;
			cmd_failed = 0;
			++devices_failed;
		}
	}

	SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost,
				   "Total of %d commands on %d"
				   " devices require eh work\n",
				   total_failures, devices_failed));
}
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7
4.64%
2
14.29%
Christoph Hellwig
5
3.31%
2
14.29%
Doug Ledford
4
2.65%
1
7.14%
James Bottomley
2
1.32%
1
7.14%
Alan Cox
2
1.32%
1
7.14%
Harvey Harrison
1
0.66%
1
7.14%
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151
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14
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#endif

 /**
 * 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;
}

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/**
 * 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.\n");
		} 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.\n");

		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.\n");
		}

		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 == 0x06) {
			evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED;
			sdev_printk(KERN_WARNING, sdev,
				    "Asymmetric access state 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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2
100.00%

/**
 * scsi_check_sense - Examine scsi cmd sense
 * @scmd:       Cmd to have sense checked.
 *
 * Return value:
 *      SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE
 *
 * Notes:
 *      When a deferred error is detected the current command has
 *      not been executed and needs retrying.
 */


int scsi_check_sense(struct scsi_cmnd *scmd)
{
	struct scsi_device *sdev = scmd->device;
	struct scsi_sense_hdr sshdr;

	if (! scsi_command_normalize_sense(scmd, &sshdr))
		return FAILED;	/* no valid sense data */

	scsi_report_sense(sdev, &sshdr);

	if (scsi_sense_is_deferred(&sshdr))
		return NEEDS_RETRY;

	if (sdev->handler && sdev->handler->check_sense) {
		int rc;

		rc = sdev->handler->check_sense(sdev, &sshdr);
		if (rc != SCSI_RETURN_NOT_HANDLED)
			return rc;
		/* handler does not care. Drop down to default handling */
	}

	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;

	/*
         * 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:
		if (sshdr.asc == 0x10) /* DIF */
			return SUCCESS;

		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) {
			/*
                         * 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;
			}
		}
		/*
                 * 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;
		/*
                 * if the device is in the process of becoming ready, we
                 * 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;
		/*
                 * Pass the UA upwards for a determination in the completion
                 * functions.
                 */
		return SUCCESS;

		/* these are not supported */
	case DATA_PROTECT:
		if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) {
			/* Thin provisioning hard threshold reached */
			set_host_byte(scmd, DID_ALLOC_FAILURE);
			return SUCCESS;
		}
	case COPY_ABORTED:
	case VOLUME_OVERFLOW:
	case MISCOMPARE:
	case BLANK_CHECK:
		set_host_byte(scmd, DID_TARGET_FAILURE);
		return SUCCESS;

	case MEDIUM_ERROR:
		if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */
		    sshdr.asc == 0x13 || /* AMNF DATA FIELD */
		    sshdr.asc == 0x14) { /* RECORD NOT FOUND */
			set_host_byte(scmd, DID_MEDIUM_ERROR);
			return SUCCESS;
		}
		return NEEDS_RETRY;

	case HARDWARE_ERROR:
		if (scmd->device->retry_hwerror)
			return ADD_TO_MLQUEUE;
		else
			set_host_byte(scmd, DID_TARGET_FAILURE);

	case ILLEGAL_REQUEST:
		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 */
			set_host_byte(scmd, DID_TARGET_FAILURE);
		}
		return SUCCESS;

	default:
		return SUCCESS;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Anderson
105
20.47%
2
8.70%
Douglas Gilbert
79
15.40%
1
4.35%
Hannes Reinecke
64
12.48%
4
17.39%
Chandra Seetharaman
47
9.16%
1
4.35%
Mike Snitzer
35
6.82%
1
4.35%
Ewan D. Milne
34
6.63%
1
4.35%
Linus Torvalds (pre-git)
27
5.26%
1
4.35%
Luben Tuikov
27
5.26%
1
4.35%
Christoph Hellwig
27
5.26%
4
17.39%
Brian King
22
4.29%
1
4.35%
TARUISI Hiroaki
17
3.31%
1
4.35%
Alan Stern
14
2.73%
2
8.70%
Martin K. Petersen
12
2.34%
1
4.35%
James Bottomley
2
0.39%
1
4.35%
Jesper Juhl
1
0.19%
1
4.35%
Total
513
100.00%
23
100.00%


EXPORT_SYMBOL_GPL(scsi_check_sense);



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->track_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;

		scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1);
		sdev->last_queue_ramp_up = jiffies;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Vasu Dev
126
98.44%
1
33.33%
Christoph Hellwig
2
1.56%
2
66.67%
Total
128
100.00%
3
100.00%



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->track_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.
                 */
		scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Christie
72
97.30%
1
50.00%
Christoph Hellwig
2
2.70%
1
50.00%
Total
74
100.00%
2
100.00%

/**
 * 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.
 */


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:
		scsi_handle_queue_ramp_up(scmd->device);
	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;
	case RESERVATION_CONFLICT:
		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;
	case QUEUE_FULL:
		scsi_handle_queue_full(scmd->device);
		/* fall through */
	case BUSY:
		return NEEDS_RETRY;
	default:
		return FAILED;
	}
	return FAILED;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Anderson
87
55.41%
1
9.09%
Linus Torvalds (pre-git)
22
14.01%
2
18.18%
James Bottomley
16
10.19%
1
9.09%
Mike Christie
10
6.37%
1
9.09%
Vasu Dev
7
4.46%
1
9.09%
Linus Torvalds
4
2.55%
1
9.09%
Michael Reed
4
2.55%
1
9.09%
Hannes Reinecke
3
1.91%
1
9.09%
Christoph Hellwig
2
1.27%
1
9.09%
Alan Cox
2
1.27%
1
9.09%
Total
157
100.00%
11
100.00%

/**
 * scsi_eh_done - Completion function for error handling.
 * @scmd:       Cmd that is done.
 */


static void scsi_eh_done(struct scsi_cmnd *scmd)
{
	struct completion *eh_action;

	SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
			"%s result: %x\n", __func__, scmd->result));

	eh_action = scmd->device->host->eh_action;
	if (eh_action)
		complete(eh_action);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Anderson
18
32.73%
1
11.11%
Michael Reed
15
27.27%
1
11.11%
Linus Torvalds (pre-git)
10
18.18%
1
11.11%
Hannes Reinecke
6
10.91%
2
22.22%
Luben Tuikov
2
3.64%
1
11.11%
Christoph Hellwig
2
3.64%
1
11.11%
Harvey Harrison
1
1.82%
1
11.11%
Alan Cox
1
1.82%
1
11.11%
Total
55
100.00%
9
100.00%

/**
 * scsi_try_host_reset - ask host adapter to reset itself
 * @scmd:       SCSI cmd to send host reset.
 */


static int scsi_try_host_reset(struct scsi_cmnd *scmd)
{
	unsigned long flags;
	int rtn;
	struct Scsi_Host *host = scmd->device->host;
	struct scsi_host_template *hostt = host->hostt;

	SCSI_LOG_ERROR_RECOVERY(3,
		shost_printk(KERN_INFO, host, "Snd Host RST\n"));

	if (!hostt->eh_host_reset_handler)
		return FAILED;

	rtn = hostt->eh_host_reset_handler(scmd);

	if (rtn == SUCCESS) {
		if (!hostt->skip_settle_delay)
			ssleep(HOST_RESET_SETTLE_TIME);
		spin_lock_irqsave(host->host_lock, flags);
		scsi_report_bus_reset(host, scmd_channel(scmd));
		spin_unlock_irqrestore(host->host_lock, flags);
	}

	return rtn;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Brian King
54
44.26%
1
11.11%
Christoph Hellwig
29
23.77%
4
44.44%
Jesper Juhl
20
16.39%
1
11.11%
Mike Anderson
10
8.20%
1
11.11%
Hannes Reinecke
5
4.10%
1
11.11%
Mike Christie
4
3.28%
1
11.11%
Total
122
100.00%
9
100.00%

/**
 * scsi_try_bus_reset - ask host to perform a bus reset
 * @scmd:       SCSI cmd to send bus reset.
 */


static int scsi_try_bus_reset(struct scsi_cmnd *scmd)
{
	unsigned long flags;
	int rtn;
	struct Scsi_Host *host = scmd->device->host;
	struct scsi_host_template *hostt = host->hostt;

	SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
		"%s: Snd Bus RST\n", __func__));

	if (!hostt->eh_bus_reset_handler)
		return FAILED;

	rtn = hostt->eh_bus_reset_handler(scmd);

	if (rtn == SUCCESS) {
		if (!hostt->skip_settle_delay)
			ssleep(BUS_RESET_SETTLE_TIME);
		spin_lock_irqsave(host->host_lock, flags);
		scsi_report_bus_reset(host, scmd_channel(scmd));
		spin_unlock_irqrestore(host->host_lock, flags);
	}

	return rtn;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Brian King
62
50.00%
1
10.00%
Jesper Juhl
20
16.13%
1
10.00%
Mike Anderson
18
14.52%
1
10.00%
Christoph Hellwig
12
9.68%
1
10.00%
Hannes Reinecke
5
4.03%
1
10.00%
Linus Torvalds (pre-git)
4
3.23%
2
20.00%
Patrick Mansfield
2
1.61%
2
20.00%
Harvey Harrison
1
0.81%
1
10.00%
Total
124
100.00%
10
100.00%



static void __scsi_report_device_reset(struct scsi_device *sdev, void *data)
{
	sdev->was_reset = 1;
	sdev->expecting_cc_ua = 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Christie
27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%

/**
 * 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;
	struct Scsi_Host *host = scmd->device->host;
	struct scsi_host_template *hostt = host->hostt;

	if (!hostt->eh_target_reset_handler)
		return FAILED;

	rtn = hostt->eh_target_reset_handler(scmd);
	if (rtn == SUCCESS) {
		spin_lock_irqsave(host->host_lock, flags);
		__starget_for_each_device(scsi_target(scmd->device), NULL,
					  __scsi_report_device_reset);
		spin_unlock_irqrestore(host->host_lock, flags);
	}

	return rtn;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Brian King
35
35.00%
1
20.00%
Mike Christie
34
34.00%
1
20.00%
Jesper Juhl
17
17.00%
1
20.00%
Mike Anderson
13
13.00%
1
20.00%
Linus Torvalds (pre-git)
1
1.00%
1
20.00%
Total
100
100.00%
5
100.00%

/**
 * 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.
 */


static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
{
	int rtn;
	struct scsi_host_template *hostt = scmd->device->host->hostt;

	if (!hostt->eh_device_reset_handler)
		return FAILED;

	rtn = hostt->eh_device_reset_handler(scmd);
	if (rtn == SUCCESS)
		__scsi_report_device_reset(scmd->device, NULL)