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![Bart Van Assche](/assets/img/avatar_default.png)
Since all scsi_cmnd.request users are gone, remove the request pointer from struct scsi_cmnd. Link: https://lore.kernel.org/r/20210809230355.8186-53-bvanassche@acm.org Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Ming Lei <ming.lei@redhat.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2492 lines
69 KiB
C
2492 lines
69 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* scsi_error.c Copyright (C) 1997 Eric Youngdale
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*
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* SCSI error/timeout handling
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* 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.
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*
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* Restructured scsi_unjam_host and associated functions.
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* September 04, 2002 Mike Anderson (andmike@us.ibm.com)
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*
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* 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)
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/gfp.h>
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#include <linux/timer.h>
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#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>
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#include <linux/blkdev.h>
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#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>
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#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_common.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/scsi_dh.h>
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#include <scsi/scsi_devinfo.h>
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#include <scsi/sg.h>
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#include "scsi_priv.h"
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#include "scsi_logging.h"
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#include "scsi_transport_api.h"
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#include <trace/events/scsi.h>
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#include <asm/unaligned.h>
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static void scsi_eh_done(struct scsi_cmnd *scmd);
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/*
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* These should *probably* be handled by the host itself.
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* Since it is allowed to sleep, it probably should.
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*/
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#define BUS_RESET_SETTLE_TIME (10)
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#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 enum scsi_disposition scsi_try_to_abort_cmd(struct scsi_host_template *,
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struct scsi_cmnd *);
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void scsi_eh_wakeup(struct Scsi_Host *shost)
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{
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lockdep_assert_held(shost->host_lock);
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if (scsi_host_busy(shost) == 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,
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"Waking error handler thread\n"));
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}
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}
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/**
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* scsi_schedule_eh - schedule EH for SCSI host
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* @shost: SCSI host to invoke error handling on.
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*
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* Schedule SCSI EH without scmd.
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*/
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void scsi_schedule_eh(struct Scsi_Host *shost)
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{
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unsigned long flags;
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spin_lock_irqsave(shost->host_lock, flags);
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if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 ||
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scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) {
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shost->host_eh_scheduled++;
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scsi_eh_wakeup(shost);
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}
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spin_unlock_irqrestore(shost->host_lock, flags);
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}
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EXPORT_SYMBOL_GPL(scsi_schedule_eh);
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static int scsi_host_eh_past_deadline(struct Scsi_Host *shost)
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{
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if (!shost->last_reset || shost->eh_deadline == -1)
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return 0;
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/*
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* 32bit accesses are guaranteed to be atomic
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* (on all supported architectures), so instead
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* 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.
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*/
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if (time_before(jiffies, shost->last_reset + shost->eh_deadline) &&
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shost->eh_deadline > -1)
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return 0;
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return 1;
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}
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static bool scsi_cmd_retry_allowed(struct scsi_cmnd *cmd)
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{
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if (cmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT)
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return true;
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return ++cmd->retries <= cmd->allowed;
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}
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static bool scsi_eh_should_retry_cmd(struct scsi_cmnd *cmd)
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{
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struct scsi_device *sdev = cmd->device;
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struct Scsi_Host *host = sdev->host;
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if (host->hostt->eh_should_retry_cmd)
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return host->hostt->eh_should_retry_cmd(cmd);
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return true;
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}
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/**
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* scmd_eh_abort_handler - Handle command aborts
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* @work: command to be aborted.
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*
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* Note: this function must be called only for a command that has timed out.
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* Because the block layer marks a request as complete before it calls
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* scsi_times_out(), a .scsi_done() call from the LLD for a command that has
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* timed out do not have any effect. Hence it is safe to call
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* scsi_finish_command() from this function.
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*/
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void
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scmd_eh_abort_handler(struct work_struct *work)
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{
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struct scsi_cmnd *scmd =
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container_of(work, struct scsi_cmnd, abort_work.work);
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struct scsi_device *sdev = scmd->device;
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enum scsi_disposition rtn;
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if (scsi_host_eh_past_deadline(sdev->host)) {
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SCSI_LOG_ERROR_RECOVERY(3,
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scmd_printk(KERN_INFO, scmd,
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"eh timeout, not aborting\n"));
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} else {
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SCSI_LOG_ERROR_RECOVERY(3,
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scmd_printk(KERN_INFO, scmd,
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"aborting command\n"));
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rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd);
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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)) {
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SCSI_LOG_ERROR_RECOVERY(3,
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scmd_printk(KERN_INFO, scmd,
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"eh timeout, not retrying "
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"aborted command\n"));
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} else if (!scsi_noretry_cmd(scmd) &&
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scsi_cmd_retry_allowed(scmd) &&
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scsi_eh_should_retry_cmd(scmd)) {
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SCSI_LOG_ERROR_RECOVERY(3,
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scmd_printk(KERN_WARNING, scmd,
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"retry aborted command\n"));
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scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY);
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return;
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} else {
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SCSI_LOG_ERROR_RECOVERY(3,
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scmd_printk(KERN_WARNING, scmd,
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"finish aborted command\n"));
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scsi_finish_command(scmd);
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return;
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}
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} else {
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SCSI_LOG_ERROR_RECOVERY(3,
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scmd_printk(KERN_INFO, scmd,
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"cmd abort %s\n",
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(rtn == FAST_IO_FAIL) ?
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"not send" : "failed"));
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}
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}
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scsi_eh_scmd_add(scmd);
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}
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/**
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* scsi_abort_command - schedule a command abort
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* @scmd: scmd to abort.
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*
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* We only need to abort commands after a command timeout
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*/
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static int
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scsi_abort_command(struct scsi_cmnd *scmd)
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{
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struct scsi_device *sdev = scmd->device;
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struct Scsi_Host *shost = sdev->host;
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unsigned long flags;
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if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) {
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/*
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* Retry after abort failed, escalate to next level.
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*/
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SCSI_LOG_ERROR_RECOVERY(3,
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scmd_printk(KERN_INFO, scmd,
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"previous abort failed\n"));
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BUG_ON(delayed_work_pending(&scmd->abort_work));
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return FAILED;
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}
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spin_lock_irqsave(shost->host_lock, flags);
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if (shost->eh_deadline != -1 && !shost->last_reset)
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shost->last_reset = jiffies;
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spin_unlock_irqrestore(shost->host_lock, flags);
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scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED;
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SCSI_LOG_ERROR_RECOVERY(3,
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scmd_printk(KERN_INFO, scmd, "abort scheduled\n"));
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queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100);
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return SUCCESS;
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}
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/**
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* scsi_eh_reset - call into ->eh_action to reset internal counters
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* @scmd: scmd to run eh on.
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*
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* The scsi driver might be carrying internal state about the
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* devices, so we need to call into the driver to reset the
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* internal state once the error handler is started.
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*/
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static void scsi_eh_reset(struct scsi_cmnd *scmd)
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{
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if (!blk_rq_is_passthrough(scsi_cmd_to_rq(scmd))) {
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struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd);
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if (sdrv->eh_reset)
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sdrv->eh_reset(scmd);
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}
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}
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static void scsi_eh_inc_host_failed(struct rcu_head *head)
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{
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struct scsi_cmnd *scmd = container_of(head, typeof(*scmd), rcu);
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struct Scsi_Host *shost = scmd->device->host;
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unsigned long flags;
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spin_lock_irqsave(shost->host_lock, flags);
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shost->host_failed++;
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scsi_eh_wakeup(shost);
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spin_unlock_irqrestore(shost->host_lock, flags);
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}
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/**
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* scsi_eh_scmd_add - add scsi cmd to error handling.
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* @scmd: scmd to run eh on.
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*/
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void scsi_eh_scmd_add(struct scsi_cmnd *scmd)
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{
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struct Scsi_Host *shost = scmd->device->host;
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unsigned long flags;
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int ret;
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WARN_ON_ONCE(!shost->ehandler);
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spin_lock_irqsave(shost->host_lock, flags);
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if (scsi_host_set_state(shost, SHOST_RECOVERY)) {
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ret = scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY);
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WARN_ON_ONCE(ret);
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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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scsi_eh_reset(scmd);
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list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q);
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spin_unlock_irqrestore(shost->host_lock, flags);
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/*
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* Ensure that all tasks observe the host state change before the
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* host_failed change.
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*/
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call_rcu(&scmd->rcu, scsi_eh_inc_host_failed);
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}
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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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*
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* Notes:
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* We do not need to lock this. There is the potential for a race
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* only in that the normal completion handling might run, but if the
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* normal completion function determines that the timer has already
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* 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 = blk_mq_rq_to_pdu(req);
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enum blk_eh_timer_return rtn = BLK_EH_DONE;
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struct Scsi_Host *host = scmd->device->host;
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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->hostt->eh_timed_out)
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rtn = host->hostt->eh_timed_out(scmd);
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if (rtn == BLK_EH_DONE) {
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/*
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* Set the command to complete first in order to prevent a real
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* completion from releasing the command while error handling
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* is using it. If the command was already completed, then the
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* lower level driver beat the timeout handler, and it is safe
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* to return without escalating error recovery.
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*
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* If timeout handling lost the race to a real completion, the
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* block layer may ignore that due to a fake timeout injection,
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* so return RESET_TIMER to allow error handling another shot
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* at this command.
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*/
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if (test_and_set_bit(SCMD_STATE_COMPLETE, &scmd->state))
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return BLK_EH_RESET_TIMER;
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if (scsi_abort_command(scmd) != SUCCESS) {
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set_host_byte(scmd, DID_TIME_OUT);
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scsi_eh_scmd_add(scmd);
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}
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}
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return rtn;
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}
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/**
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* scsi_block_when_processing_errors - Prevent cmds from being queued.
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* @sdev: Device on which we are performing recovery.
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*
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* Description:
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* We block until the host is out of error recovery, and then check to
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* see whether the host or the device is offline.
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*
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* Return value:
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* 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)
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{
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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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return online;
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}
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EXPORT_SYMBOL(scsi_block_when_processing_errors);
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#ifdef CONFIG_SCSI_LOGGING
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/**
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* scsi_eh_prt_fail_stats - Log info on failures.
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* @shost: scsi host being recovered.
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* @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,
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struct list_head *work_q)
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{
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struct scsi_cmnd *scmd;
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struct scsi_device *sdev;
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int total_failures = 0;
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int cmd_failed = 0;
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int cmd_cancel = 0;
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int devices_failed = 0;
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shost_for_each_device(sdev, shost) {
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list_for_each_entry(scmd, work_q, eh_entry) {
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if (scmd->device == sdev) {
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++total_failures;
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if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED)
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++cmd_cancel;
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else
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++cmd_failed;
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}
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}
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if (cmd_cancel || cmd_failed) {
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SCSI_LOG_ERROR_RECOVERY(3,
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shost_printk(KERN_INFO, shost,
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"%s: cmds failed: %d, cancel: %d\n",
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__func__, cmd_failed,
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cmd_cancel));
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cmd_cancel = 0;
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cmd_failed = 0;
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++devices_failed;
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}
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}
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SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost,
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"Total of %d commands on %d"
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" devices require eh work\n",
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total_failures, devices_failed));
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}
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#endif
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/**
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* scsi_report_lun_change - Set flag on all *other* devices on the same target
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* to indicate that a UNIT ATTENTION is expected.
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* @sdev: Device reporting the UNIT ATTENTION
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*/
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static void scsi_report_lun_change(struct scsi_device *sdev)
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{
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sdev->sdev_target->expecting_lun_change = 1;
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}
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/**
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* scsi_report_sense - Examine scsi sense information and log messages for
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* certain conditions, also issue uevents for some of them.
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* @sdev: Device reporting the sense code
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* @sshdr: sshdr to be examined
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*/
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static void scsi_report_sense(struct scsi_device *sdev,
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struct scsi_sense_hdr *sshdr)
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{
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enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */
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if (sshdr->sense_key == UNIT_ATTENTION) {
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if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) {
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evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED;
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sdev_printk(KERN_WARNING, sdev,
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"Inquiry data has changed");
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} else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) {
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evt_type = SDEV_EVT_LUN_CHANGE_REPORTED;
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scsi_report_lun_change(sdev);
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sdev_printk(KERN_WARNING, sdev,
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"Warning! Received an indication that the "
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"LUN assignments on this target have "
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"changed. The Linux SCSI layer does not "
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"automatically remap LUN assignments.\n");
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} else if (sshdr->asc == 0x3f)
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sdev_printk(KERN_WARNING, sdev,
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"Warning! Received an indication that the "
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"operating parameters on this target have "
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"changed. The Linux SCSI layer does not "
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"automatically adjust these parameters.\n");
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if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) {
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evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED;
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sdev_printk(KERN_WARNING, sdev,
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"Warning! Received an indication that the "
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"LUN reached a thin provisioning soft "
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"threshold.\n");
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}
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if (sshdr->asc == 0x29) {
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evt_type = SDEV_EVT_POWER_ON_RESET_OCCURRED;
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sdev_printk(KERN_WARNING, sdev,
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"Power-on or device reset occurred\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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
enum scsi_disposition 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) {
|
|
enum scsi_disposition 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;
|
|
|
|
if (sshdr.asc == 0x44 && sdev->sdev_bflags & BLIST_RETRY_ITF)
|
|
return ADD_TO_MLQUEUE;
|
|
if (sshdr.asc == 0xc1 && sshdr.ascq == 0x01 &&
|
|
sdev->sdev_bflags & BLIST_RETRY_ASC_C1)
|
|
return ADD_TO_MLQUEUE;
|
|
|
|
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;
|
|
}
|
|
fallthrough;
|
|
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);
|
|
fallthrough;
|
|
|
|
case ILLEGAL_REQUEST:
|
|
if (sshdr.asc == 0x20 || /* Invalid command operation code */
|
|
sshdr.asc == 0x21 || /* Logical block address out of range */
|
|
sshdr.asc == 0x22 || /* Invalid function */
|
|
sshdr.asc == 0x24 || /* Invalid field in cdb */
|
|
sshdr.asc == 0x26 || /* Parameter value invalid */
|
|
sshdr.asc == 0x27) { /* Write protected */
|
|
set_host_byte(scmd, DID_TARGET_FAILURE);
|
|
}
|
|
return SUCCESS;
|
|
|
|
default:
|
|
return SUCCESS;
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 enum scsi_disposition 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;
|
|
|
|
/*
|
|
* now, check the status byte to see if this indicates
|
|
* anything special.
|
|
*/
|
|
switch (get_status_byte(scmd)) {
|
|
case SAM_STAT_GOOD:
|
|
scsi_handle_queue_ramp_up(scmd->device);
|
|
fallthrough;
|
|
case SAM_STAT_COMMAND_TERMINATED:
|
|
return SUCCESS;
|
|
case SAM_STAT_CHECK_CONDITION:
|
|
return scsi_check_sense(scmd);
|
|
case SAM_STAT_CONDITION_MET:
|
|
case SAM_STAT_INTERMEDIATE:
|
|
case SAM_STAT_INTERMEDIATE_CONDITION_MET:
|
|
/*
|
|
* who knows? FIXME(eric)
|
|
*/
|
|
return SUCCESS;
|
|
case SAM_STAT_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 SAM_STAT_TASK_SET_FULL:
|
|
scsi_handle_queue_full(scmd->device);
|
|
fallthrough;
|
|
case SAM_STAT_BUSY:
|
|
return NEEDS_RETRY;
|
|
default:
|
|
return FAILED;
|
|
}
|
|
return FAILED;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* scsi_try_host_reset - ask host adapter to reset itself
|
|
* @scmd: SCSI cmd to send host reset.
|
|
*/
|
|
static enum scsi_disposition scsi_try_host_reset(struct scsi_cmnd *scmd)
|
|
{
|
|
unsigned long flags;
|
|
enum scsi_disposition 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;
|
|
}
|
|
|
|
/**
|
|
* scsi_try_bus_reset - ask host to perform a bus reset
|
|
* @scmd: SCSI cmd to send bus reset.
|
|
*/
|
|
static enum scsi_disposition scsi_try_bus_reset(struct scsi_cmnd *scmd)
|
|
{
|
|
unsigned long flags;
|
|
enum scsi_disposition 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;
|
|
}
|
|
|
|
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 enum scsi_disposition scsi_try_target_reset(struct scsi_cmnd *scmd)
|
|
{
|
|
unsigned long flags;
|
|
enum scsi_disposition 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;
|
|
}
|
|
|
|
/**
|
|
* 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 enum scsi_disposition scsi_try_bus_device_reset(struct scsi_cmnd *scmd)
|
|
{
|
|
enum scsi_disposition 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);
|
|
return rtn;
|
|
}
|
|
|
|
/**
|
|
* scsi_try_to_abort_cmd - Ask host to abort a SCSI command
|
|
* @hostt: SCSI driver host template
|
|
* @scmd: SCSI cmd used to send a target reset
|
|
*
|
|
* Return value:
|
|
* SUCCESS, FAILED, or FAST_IO_FAIL
|
|
*
|
|
* Notes:
|
|
* SUCCESS does not necessarily indicate that the command
|
|
* has been aborted; it only indicates that the LLDDs
|
|
* has cleared all references to that command.
|
|
* LLDDs should return FAILED only if an abort was required
|
|
* but could not be executed. LLDDs should return FAST_IO_FAIL
|
|
* if the device is temporarily unavailable (eg due to a
|
|
* link down on FibreChannel)
|
|
*/
|
|
static enum scsi_disposition
|
|
scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd)
|
|
{
|
|
if (!hostt->eh_abort_handler)
|
|
return FAILED;
|
|
|
|
return hostt->eh_abort_handler(scmd);
|
|
}
|
|
|
|
static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd)
|
|
{
|
|
if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS)
|
|
if (scsi_try_bus_device_reset(scmd) != SUCCESS)
|
|
if (scsi_try_target_reset(scmd) != SUCCESS)
|
|
if (scsi_try_bus_reset(scmd) != SUCCESS)
|
|
scsi_try_host_reset(scmd);
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery
|
|
* @scmd: SCSI command structure to hijack
|
|
* @ses: structure to save restore information
|
|
* @cmnd: CDB to send. Can be NULL if no new cmnd is needed
|
|
* @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB)
|
|
* @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored)
|
|
*
|
|
* This function is used to save a scsi command information before re-execution
|
|
* 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.
|
|
*/
|
|
void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses,
|
|
unsigned char *cmnd, int cmnd_size, unsigned sense_bytes)
|
|
{
|
|
struct scsi_device *sdev = scmd->device;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
ses->cmd_len = scmd->cmd_len;
|
|
ses->cmnd = scmd->cmnd;
|
|
ses->data_direction = scmd->sc_data_direction;
|
|
ses->sdb = scmd->sdb;
|
|
ses->result = scmd->result;
|
|
ses->resid_len = scmd->req.resid_len;
|
|
ses->underflow = scmd->underflow;
|
|
ses->prot_op = scmd->prot_op;
|
|
ses->eh_eflags = scmd->eh_eflags;
|
|
|
|
scmd->prot_op = SCSI_PROT_NORMAL;
|
|
scmd->eh_eflags = 0;
|
|
scmd->cmnd = ses->eh_cmnd;
|
|
memset(scmd->cmnd, 0, BLK_MAX_CDB);
|
|
memset(&scmd->sdb, 0, sizeof(scmd->sdb));
|
|
scmd->result = 0;
|
|
scmd->req.resid_len = 0;
|
|
|
|
if (sense_bytes) {
|
|
scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE,
|
|
sense_bytes);
|
|
sg_init_one(&ses->sense_sgl, scmd->sense_buffer,
|
|
scmd->sdb.length);
|
|
scmd->sdb.table.sgl = &ses->sense_sgl;
|
|
scmd->sc_data_direction = DMA_FROM_DEVICE;
|
|
scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1;
|
|
scmd->cmnd[0] = REQUEST_SENSE;
|
|
scmd->cmnd[4] = scmd->sdb.length;
|
|
scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
|
|
} else {
|
|
scmd->sc_data_direction = DMA_NONE;
|
|
if (cmnd) {
|
|
BUG_ON(cmnd_size > BLK_MAX_CDB);
|
|
memcpy(scmd->cmnd, cmnd, cmnd_size);
|
|
scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
|
|
}
|
|
}
|
|
|
|
scmd->underflow = 0;
|
|
|
|
if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN)
|
|
scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) |
|
|
(sdev->lun << 5 & 0xe0);
|
|
|
|
/*
|
|
* Zero the sense buffer. The scsi spec mandates that any
|
|
* untransferred sense data should be interpreted as being zero.
|
|
*/
|
|
memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
|
|
}
|
|
EXPORT_SYMBOL(scsi_eh_prep_cmnd);
|
|
|
|
/**
|
|
* scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery
|
|
* @scmd: SCSI command structure to restore
|
|
* @ses: saved information from a coresponding call to scsi_eh_prep_cmnd
|
|
*
|
|
* Undo any damage done by above scsi_eh_prep_cmnd().
|
|
*/
|
|
void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses)
|
|
{
|
|
/*
|
|
* Restore original data
|
|
*/
|
|
scmd->cmd_len = ses->cmd_len;
|
|
scmd->cmnd = ses->cmnd;
|
|
scmd->sc_data_direction = ses->data_direction;
|
|
scmd->sdb = ses->sdb;
|
|
scmd->result = ses->result;
|
|
scmd->req.resid_len = ses->resid_len;
|
|
scmd->underflow = ses->underflow;
|
|
scmd->prot_op = ses->prot_op;
|
|
scmd->eh_eflags = ses->eh_eflags;
|
|
}
|
|
EXPORT_SYMBOL(scsi_eh_restore_cmnd);
|
|
|
|
/**
|
|
* scsi_send_eh_cmnd - submit a scsi command as part of error recovery
|
|
* @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
|
|
*/
|
|
static enum scsi_disposition 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);
|
|
unsigned long timeleft = timeout, delay;
|
|
struct scsi_eh_save ses;
|
|
const unsigned long stall_for = msecs_to_jiffies(100);
|
|
int rtn;
|
|
|
|
retry:
|
|
scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes);
|
|
shost->eh_action = &done;
|
|
|
|
scsi_log_send(scmd);
|
|
scmd->scsi_done = scsi_eh_done;
|
|
|
|
/*
|
|
* Lock sdev->state_mutex to avoid that scsi_device_quiesce() can
|
|
* change the SCSI device state after we have examined it and before
|
|
* .queuecommand() is called.
|
|
*/
|
|
mutex_lock(&sdev->state_mutex);
|
|
while (sdev->sdev_state == SDEV_BLOCK && timeleft > 0) {
|
|
mutex_unlock(&sdev->state_mutex);
|
|
SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_DEBUG, sdev,
|
|
"%s: state %d <> %d\n", __func__, sdev->sdev_state,
|
|
SDEV_BLOCK));
|
|
delay = min(timeleft, stall_for);
|
|
timeleft -= delay;
|
|
msleep(jiffies_to_msecs(delay));
|
|
mutex_lock(&sdev->state_mutex);
|
|
}
|
|
if (sdev->sdev_state != SDEV_BLOCK)
|
|
rtn = shost->hostt->queuecommand(shost, scmd);
|
|
else
|
|
rtn = FAILED;
|
|
mutex_unlock(&sdev->state_mutex);
|
|
|
|
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 = FAILED;
|
|
} else {
|
|
timeleft = wait_for_completion_timeout(&done, timeout);
|
|
rtn = SUCCESS;
|
|
}
|
|
|
|
shost->eh_action = NULL;
|
|
|
|
scsi_log_completion(scmd, rtn);
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
|
|
"%s timeleft: %ld\n",
|
|
__func__, timeleft));
|
|
|
|
/*
|
|
* 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)
|
|
*/
|
|
if (timeleft) {
|
|
rtn = scsi_eh_completed_normally(scmd);
|
|
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
|
|
"%s: scsi_eh_completed_normally %x\n", __func__, rtn));
|
|
|
|
switch (rtn) {
|
|
case SUCCESS:
|
|
case NEEDS_RETRY:
|
|
case FAILED:
|
|
break;
|
|
case ADD_TO_MLQUEUE:
|
|
rtn = NEEDS_RETRY;
|
|
break;
|
|
default:
|
|
rtn = FAILED;
|
|
break;
|
|
}
|
|
} else if (rtn != FAILED) {
|
|
scsi_abort_eh_cmnd(scmd);
|
|
rtn = FAILED;
|
|
}
|
|
|
|
scsi_eh_restore_cmnd(scmd, &ses);
|
|
|
|
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.
|
|
*/
|
|
static enum scsi_disposition scsi_request_sense(struct scsi_cmnd *scmd)
|
|
{
|
|
return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0);
|
|
}
|
|
|
|
static enum scsi_disposition
|
|
scsi_eh_action(struct scsi_cmnd *scmd, enum scsi_disposition rtn)
|
|
{
|
|
if (!blk_rq_is_passthrough(scsi_cmd_to_rq(scmd))) {
|
|
struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd);
|
|
if (sdrv->eh_action)
|
|
rtn = sdrv->eh_action(scmd, rtn);
|
|
}
|
|
return rtn;
|
|
}
|
|
|
|
/**
|
|
* 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,
|
|
* and that would disturb what we are doing. Thus we really want to
|
|
* keep a list of pending commands for final completion, and once we
|
|
* are ready to leave error handling we handle completion for real.
|
|
*/
|
|
void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q)
|
|
{
|
|
list_move_tail(&scmd->eh_entry, done_q);
|
|
}
|
|
EXPORT_SYMBOL(scsi_eh_finish_cmd);
|
|
|
|
/**
|
|
* scsi_eh_get_sense - Get device sense data.
|
|
* @work_q: Queue of commands to process.
|
|
* @done_q: Queue of processed commands.
|
|
*
|
|
* Description:
|
|
* See if we need to request sense information. if so, then get it
|
|
* now, so we have a better idea of what to do.
|
|
*
|
|
* Notes:
|
|
* This has the unfortunate side effect that if a shost adapter does
|
|
* not automatically request sense information, we end up shutting
|
|
* 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.
|
|
*/
|
|
int scsi_eh_get_sense(struct list_head *work_q,
|
|
struct list_head *done_q)
|
|
{
|
|
struct scsi_cmnd *scmd, *next;
|
|
struct Scsi_Host *shost;
|
|
enum scsi_disposition rtn;
|
|
|
|
/*
|
|
* If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO,
|
|
* should not get sense.
|
|
*/
|
|
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
|
|
if ((scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) ||
|
|
SCSI_SENSE_VALID(scmd))
|
|
continue;
|
|
|
|
shost = scmd->device->host;
|
|
if (scsi_host_eh_past_deadline(shost)) {
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
scmd_printk(KERN_INFO, scmd,
|
|
"%s: skip request sense, past eh deadline\n",
|
|
current->comm));
|
|
break;
|
|
}
|
|
if (!scsi_status_is_check_condition(scmd->result))
|
|
/*
|
|
* 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;
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd,
|
|
"%s: requesting sense\n",
|
|
current->comm));
|
|
rtn = scsi_request_sense(scmd);
|
|
if (rtn != SUCCESS)
|
|
continue;
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
|
|
"sense requested, result %x\n", scmd->result));
|
|
SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(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. If the user
|
|
* has requested infinite retries, we also want to
|
|
* finish this command, so force completion by setting
|
|
* retries and allowed to the same value.
|
|
*/
|
|
if (scmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT)
|
|
scmd->retries = scmd->allowed = 1;
|
|
else
|
|
scmd->retries = scmd->allowed;
|
|
else if (rtn != NEEDS_RETRY)
|
|
continue;
|
|
|
|
scsi_eh_finish_cmd(scmd, done_q);
|
|
}
|
|
|
|
return list_empty(work_q);
|
|
}
|
|
EXPORT_SYMBOL_GPL(scsi_eh_get_sense);
|
|
|
|
/**
|
|
* scsi_eh_tur - Send TUR to device.
|
|
* @scmd: &scsi_cmnd to send TUR
|
|
*
|
|
* Return value:
|
|
* 0 - Device is ready. 1 - Device NOT ready.
|
|
*/
|
|
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;
|
|
enum scsi_disposition rtn;
|
|
|
|
retry_tur:
|
|
rtn = scsi_send_eh_cmnd(scmd, tur_command, 6,
|
|
scmd->device->eh_timeout, 0);
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd,
|
|
"%s return: %x\n", __func__, rtn));
|
|
|
|
switch (rtn) {
|
|
case NEEDS_RETRY:
|
|
if (retry_cnt--)
|
|
goto retry_tur;
|
|
fallthrough;
|
|
case SUCCESS:
|
|
return 0;
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_test_devices - check if devices are responding from error recovery.
|
|
* @cmd_list: scsi commands in error recovery.
|
|
* @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.
|
|
*
|
|
* 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;
|
|
|
|
if (!try_stu) {
|
|
if (scsi_host_eh_past_deadline(sdev->host)) {
|
|
/* Push items back onto work_q */
|
|
list_splice_init(cmd_list, work_q);
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
sdev_printk(KERN_INFO, sdev,
|
|
"%s: skip test device, past eh deadline",
|
|
current->comm));
|
|
break;
|
|
}
|
|
}
|
|
|
|
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) {
|
|
if (finish_cmds &&
|
|
(try_stu ||
|
|
scsi_eh_action(scmd, SUCCESS) == SUCCESS))
|
|
scsi_eh_finish_cmd(scmd, done_q);
|
|
else
|
|
list_move_tail(&scmd->eh_entry, work_q);
|
|
}
|
|
}
|
|
return list_empty(work_q);
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_try_stu - Send START_UNIT to device.
|
|
* @scmd: &scsi_cmnd to send START_UNIT
|
|
*
|
|
* Return value:
|
|
* 0 - Device is ready. 1 - Device NOT ready.
|
|
*/
|
|
static int scsi_eh_try_stu(struct scsi_cmnd *scmd)
|
|
{
|
|
static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0};
|
|
|
|
if (scmd->device->allow_restart) {
|
|
int i;
|
|
enum scsi_disposition rtn = NEEDS_RETRY;
|
|
|
|
for (i = 0; rtn == NEEDS_RETRY && i < 2; i++)
|
|
rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0);
|
|
|
|
if (rtn == SUCCESS)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_stu - send START_UNIT if needed
|
|
* @shost: &scsi host being recovered.
|
|
* @work_q: &list_head for pending commands.
|
|
* @done_q: &list_head for processed commands.
|
|
*
|
|
* Notes:
|
|
* If commands are failing due to not ready, initializing command required,
|
|
* try revalidating the device, which will end up sending a start unit.
|
|
*/
|
|
static int scsi_eh_stu(struct Scsi_Host *shost,
|
|
struct list_head *work_q,
|
|
struct list_head *done_q)
|
|
{
|
|
struct scsi_cmnd *scmd, *stu_scmd, *next;
|
|
struct scsi_device *sdev;
|
|
|
|
shost_for_each_device(sdev, shost) {
|
|
if (scsi_host_eh_past_deadline(shost)) {
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
sdev_printk(KERN_INFO, sdev,
|
|
"%s: skip START_UNIT, past eh deadline\n",
|
|
current->comm));
|
|
scsi_device_put(sdev);
|
|
break;
|
|
}
|
|
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;
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
sdev_printk(KERN_INFO, sdev,
|
|
"%s: Sending START_UNIT\n",
|
|
current->comm));
|
|
|
|
if (!scsi_eh_try_stu(stu_scmd)) {
|
|
if (!scsi_device_online(sdev) ||
|
|
!scsi_eh_tur(stu_scmd)) {
|
|
list_for_each_entry_safe(scmd, next,
|
|
work_q, eh_entry) {
|
|
if (scmd->device == sdev &&
|
|
scsi_eh_action(scmd, SUCCESS) == SUCCESS)
|
|
scsi_eh_finish_cmd(scmd, done_q);
|
|
}
|
|
}
|
|
} else {
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
sdev_printk(KERN_INFO, sdev,
|
|
"%s: START_UNIT failed\n",
|
|
current->comm));
|
|
}
|
|
}
|
|
|
|
return list_empty(work_q);
|
|
}
|
|
|
|
|
|
/**
|
|
* scsi_eh_bus_device_reset - send bdr if needed
|
|
* @shost: scsi host being recovered.
|
|
* @work_q: &list_head for pending commands.
|
|
* @done_q: &list_head for processed commands.
|
|
*
|
|
* Notes:
|
|
* Try a bus device reset. Still, look to see whether we have multiple
|
|
* 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
|
|
* a bus_reset instead.
|
|
*/
|
|
static int scsi_eh_bus_device_reset(struct Scsi_Host *shost,
|
|
struct list_head *work_q,
|
|
struct list_head *done_q)
|
|
{
|
|
struct scsi_cmnd *scmd, *bdr_scmd, *next;
|
|
struct scsi_device *sdev;
|
|
enum scsi_disposition rtn;
|
|
|
|
shost_for_each_device(sdev, shost) {
|
|
if (scsi_host_eh_past_deadline(shost)) {
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
sdev_printk(KERN_INFO, sdev,
|
|
"%s: skip BDR, past eh deadline\n",
|
|
current->comm));
|
|
scsi_device_put(sdev);
|
|
break;
|
|
}
|
|
bdr_scmd = NULL;
|
|
list_for_each_entry(scmd, work_q, eh_entry)
|
|
if (scmd->device == sdev) {
|
|
bdr_scmd = scmd;
|
|
break;
|
|
}
|
|
|
|
if (!bdr_scmd)
|
|
continue;
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
sdev_printk(KERN_INFO, sdev,
|
|
"%s: Sending BDR\n", current->comm));
|
|
rtn = scsi_try_bus_device_reset(bdr_scmd);
|
|
if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
|
|
if (!scsi_device_online(sdev) ||
|
|
rtn == FAST_IO_FAIL ||
|
|
!scsi_eh_tur(bdr_scmd)) {
|
|
list_for_each_entry_safe(scmd, next,
|
|
work_q, eh_entry) {
|
|
if (scmd->device == sdev &&
|
|
scsi_eh_action(scmd, rtn) != FAILED)
|
|
scsi_eh_finish_cmd(scmd,
|
|
done_q);
|
|
}
|
|
}
|
|
} else {
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
sdev_printk(KERN_INFO, sdev,
|
|
"%s: BDR failed\n", current->comm));
|
|
}
|
|
}
|
|
|
|
return list_empty(work_q);
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_target_reset - send target reset if needed
|
|
* @shost: scsi host being recovered.
|
|
* @work_q: &list_head for pending commands.
|
|
* @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)
|
|
{
|
|
LIST_HEAD(tmp_list);
|
|
LIST_HEAD(check_list);
|
|
|
|
list_splice_init(work_q, &tmp_list);
|
|
|
|
while (!list_empty(&tmp_list)) {
|
|
struct scsi_cmnd *next, *scmd;
|
|
enum scsi_disposition rtn;
|
|
unsigned int id;
|
|
|
|
if (scsi_host_eh_past_deadline(shost)) {
|
|
/* 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,
|
|
"%s: Skip target reset, past eh deadline\n",
|
|
current->comm));
|
|
return list_empty(work_q);
|
|
}
|
|
|
|
scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry);
|
|
id = scmd_id(scmd);
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: Sending target reset to target %d\n",
|
|
current->comm, id));
|
|
rtn = scsi_try_target_reset(scmd);
|
|
if (rtn != SUCCESS && rtn != FAST_IO_FAIL)
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: Target reset failed"
|
|
" target: %d\n",
|
|
current->comm, id));
|
|
list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) {
|
|
if (scmd_id(scmd) != id)
|
|
continue;
|
|
|
|
if (rtn == SUCCESS)
|
|
list_move_tail(&scmd->eh_entry, &check_list);
|
|
else if (rtn == FAST_IO_FAIL)
|
|
scsi_eh_finish_cmd(scmd, done_q);
|
|
else
|
|
/* push back on work queue for further processing */
|
|
list_move(&scmd->eh_entry, work_q);
|
|
}
|
|
}
|
|
|
|
return scsi_eh_test_devices(&check_list, work_q, done_q, 0);
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_bus_reset - send a bus reset
|
|
* @shost: &scsi host being recovered.
|
|
* @work_q: &list_head for pending commands.
|
|
* @done_q: &list_head for processed commands.
|
|
*/
|
|
static int scsi_eh_bus_reset(struct Scsi_Host *shost,
|
|
struct list_head *work_q,
|
|
struct list_head *done_q)
|
|
{
|
|
struct scsi_cmnd *scmd, *chan_scmd, *next;
|
|
LIST_HEAD(check_list);
|
|
unsigned int channel;
|
|
enum scsi_disposition 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
|
|
* the reset.
|
|
*/
|
|
|
|
for (channel = 0; channel <= shost->max_channel; channel++) {
|
|
if (scsi_host_eh_past_deadline(shost)) {
|
|
list_splice_init(&check_list, work_q);
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: skip BRST, past eh deadline\n",
|
|
current->comm));
|
|
return list_empty(work_q);
|
|
}
|
|
|
|
chan_scmd = NULL;
|
|
list_for_each_entry(scmd, work_q, eh_entry) {
|
|
if (channel == scmd_channel(scmd)) {
|
|
chan_scmd = scmd;
|
|
break;
|
|
/*
|
|
* FIXME add back in some support for
|
|
* soft_reset devices.
|
|
*/
|
|
}
|
|
}
|
|
|
|
if (!chan_scmd)
|
|
continue;
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: Sending BRST chan: %d\n",
|
|
current->comm, channel));
|
|
rtn = scsi_try_bus_reset(chan_scmd);
|
|
if (rtn == SUCCESS || rtn == FAST_IO_FAIL) {
|
|
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
|
|
if (channel == scmd_channel(scmd)) {
|
|
if (rtn == FAST_IO_FAIL)
|
|
scsi_eh_finish_cmd(scmd,
|
|
done_q);
|
|
else
|
|
list_move_tail(&scmd->eh_entry,
|
|
&check_list);
|
|
}
|
|
}
|
|
} else {
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: BRST failed chan: %d\n",
|
|
current->comm, channel));
|
|
}
|
|
}
|
|
return scsi_eh_test_devices(&check_list, work_q, done_q, 0);
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_host_reset - send a host reset
|
|
* @shost: host to be reset.
|
|
* @work_q: &list_head for pending commands.
|
|
* @done_q: &list_head for processed commands.
|
|
*/
|
|
static int scsi_eh_host_reset(struct Scsi_Host *shost,
|
|
struct list_head *work_q,
|
|
struct list_head *done_q)
|
|
{
|
|
struct scsi_cmnd *scmd, *next;
|
|
LIST_HEAD(check_list);
|
|
enum scsi_disposition rtn;
|
|
|
|
if (!list_empty(work_q)) {
|
|
scmd = list_entry(work_q->next,
|
|
struct scsi_cmnd, eh_entry);
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: Sending HRST\n",
|
|
current->comm));
|
|
|
|
rtn = scsi_try_host_reset(scmd);
|
|
if (rtn == SUCCESS) {
|
|
list_splice_init(work_q, &check_list);
|
|
} else if (rtn == FAST_IO_FAIL) {
|
|
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
|
|
scsi_eh_finish_cmd(scmd, done_q);
|
|
}
|
|
} else {
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
shost_printk(KERN_INFO, shost,
|
|
"%s: HRST failed\n",
|
|
current->comm));
|
|
}
|
|
}
|
|
return scsi_eh_test_devices(&check_list, work_q, done_q, 1);
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_offline_sdevs - offline scsi devices that fail to recover
|
|
* @work_q: &list_head for pending commands.
|
|
* @done_q: &list_head for processed commands.
|
|
*/
|
|
static void scsi_eh_offline_sdevs(struct list_head *work_q,
|
|
struct list_head *done_q)
|
|
{
|
|
struct scsi_cmnd *scmd, *next;
|
|
struct scsi_device *sdev;
|
|
|
|
list_for_each_entry_safe(scmd, next, work_q, eh_entry) {
|
|
sdev_printk(KERN_INFO, scmd->device, "Device offlined - "
|
|
"not ready after error recovery\n");
|
|
sdev = scmd->device;
|
|
|
|
mutex_lock(&sdev->state_mutex);
|
|
scsi_device_set_state(sdev, SDEV_OFFLINE);
|
|
mutex_unlock(&sdev->state_mutex);
|
|
|
|
scsi_eh_finish_cmd(scmd, done_q);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* scsi_noretry_cmd - determine if command should be failed fast
|
|
* @scmd: SCSI cmd to examine.
|
|
*/
|
|
int scsi_noretry_cmd(struct scsi_cmnd *scmd)
|
|
{
|
|
struct request *req = scsi_cmd_to_rq(scmd);
|
|
|
|
switch (host_byte(scmd->result)) {
|
|
case DID_OK:
|
|
break;
|
|
case DID_TIME_OUT:
|
|
goto check_type;
|
|
case DID_BUS_BUSY:
|
|
return req->cmd_flags & REQ_FAILFAST_TRANSPORT;
|
|
case DID_PARITY:
|
|
return req->cmd_flags & REQ_FAILFAST_DEV;
|
|
case DID_ERROR:
|
|
if (get_status_byte(scmd) == SAM_STAT_RESERVATION_CONFLICT)
|
|
return 0;
|
|
fallthrough;
|
|
case DID_SOFT_ERROR:
|
|
return req->cmd_flags & REQ_FAILFAST_DRIVER;
|
|
}
|
|
|
|
if (!scsi_status_is_check_condition(scmd->result))
|
|
return 0;
|
|
|
|
check_type:
|
|
/*
|
|
* assume caller has checked sense and determined
|
|
* the check condition was retryable.
|
|
*/
|
|
if (req->cmd_flags & REQ_FAILFAST_DEV || blk_rq_is_passthrough(req))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
enum scsi_disposition scsi_decide_disposition(struct scsi_cmnd *scmd)
|
|
{
|
|
enum scsi_disposition 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)) {
|
|
SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd,
|
|
"%s: device offline - report as SUCCESS\n", __func__));
|
|
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;
|
|
case DID_ABORT:
|
|
if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) {
|
|
set_host_byte(scmd, DID_TIME_OUT);
|
|
return SUCCESS;
|
|
}
|
|
fallthrough;
|
|
case DID_NO_CONNECT:
|
|
case DID_BAD_TARGET:
|
|
/*
|
|
* 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;
|
|
case DID_SOFT_ERROR:
|
|
/*
|
|
* when the low level driver returns did_soft_error,
|
|
* it is responsible for keeping an internal retry counter
|
|
* in order to avoid endless loops (db)
|
|
*/
|
|
goto maybe_retry;
|
|
case DID_IMM_RETRY:
|
|
return NEEDS_RETRY;
|
|
|
|
case DID_REQUEUE:
|
|
return ADD_TO_MLQUEUE;
|
|
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
|
|
* based on its timers and recovery capablilities if
|
|
* there are enough retries.
|
|
*/
|
|
goto maybe_retry;
|
|
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;
|
|
case DID_TRANSPORT_MARGINAL:
|
|
/*
|
|
* caller has decided not to do retries on
|
|
* abort success, so send IO directly upwards
|
|
*/
|
|
return SUCCESS;
|
|
case DID_ERROR:
|
|
if (get_status_byte(scmd) == SAM_STAT_RESERVATION_CONFLICT)
|
|
/*
|
|
* execute reservation conflict processing code
|
|
* lower down
|
|
*/
|
|
break;
|
|
fallthrough;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* check the status byte to see if this indicates anything special.
|
|
*/
|
|
switch (get_status_byte(scmd)) {
|
|
case SAM_STAT_TASK_SET_FULL:
|
|
scsi_handle_queue_full(scmd->device);
|
|
/*
|
|
* the case of trying to send too many commands to a
|
|
* tagged queueing device.
|
|
*/
|
|
fallthrough;
|
|
case SAM_STAT_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 SAM_STAT_GOOD:
|
|
if (scmd->cmnd[0] == REPORT_LUNS)
|
|
scmd->device->sdev_target->expecting_lun_change = 0;
|
|
scsi_handle_queue_ramp_up(scmd->device);
|
|
fallthrough;
|
|
case SAM_STAT_COMMAND_TERMINATED:
|
|
return SUCCESS;
|
|
case SAM_STAT_TASK_ABORTED:
|
|
goto maybe_retry;
|
|
case SAM_STAT_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 SAM_STAT_CONDITION_MET:
|
|
case SAM_STAT_INTERMEDIATE:
|
|
case SAM_STAT_INTERMEDIATE_CONDITION_MET:
|
|
case SAM_STAT_ACA_ACTIVE:
|
|
/*
|
|
* who knows? FIXME(eric)
|
|
*/
|
|
return SUCCESS;
|
|
|
|
case SAM_STAT_RESERVATION_CONFLICT:
|
|
sdev_printk(KERN_INFO, scmd->device,
|
|
"reservation conflict\n");
|
|
set_host_byte(scmd, DID_NEXUS_FAILURE);
|
|
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) */
|
|
if (scsi_cmd_retry_allowed(scmd) && !scsi_noretry_cmd(scmd)) {
|
|
return NEEDS_RETRY;
|
|
} else {
|
|
/*
|
|
* no more retries - report this one back to upper level.
|
|
*/
|
|
return SUCCESS;
|
|
}
|
|
}
|
|
|
|
static void eh_lock_door_done(struct request *req, blk_status_t status)
|
|
{
|
|
blk_put_request(req);
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_lock_door - Prevent medium removal for the specified device
|
|
* @sdev: SCSI device to prevent medium removal
|
|
*
|
|
* Locking:
|
|
* We must be called from process context.
|
|
*
|
|
* Notes:
|
|
* We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the
|
|
* head of the devices request queue, and continue.
|
|
*/
|
|
static void scsi_eh_lock_door(struct scsi_device *sdev)
|
|
{
|
|
struct request *req;
|
|
struct scsi_request *rq;
|
|
|
|
req = blk_get_request(sdev->request_queue, REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(req))
|
|
return;
|
|
rq = scsi_req(req);
|
|
|
|
rq->cmd[0] = ALLOW_MEDIUM_REMOVAL;
|
|
rq->cmd[1] = 0;
|
|
rq->cmd[2] = 0;
|
|
rq->cmd[3] = 0;
|
|
rq->cmd[4] = SCSI_REMOVAL_PREVENT;
|
|
rq->cmd[5] = 0;
|
|
rq->cmd_len = COMMAND_SIZE(rq->cmd[0]);
|
|
|
|
req->rq_flags |= RQF_QUIET;
|
|
req->timeout = 10 * HZ;
|
|
rq->retries = 5;
|
|
|
|
blk_execute_rq_nowait(NULL, req, 1, eh_lock_door_done);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
static void scsi_restart_operations(struct Scsi_Host *shost)
|
|
{
|
|
struct scsi_device *sdev;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* 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) {
|
|
if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) {
|
|
scsi_eh_lock_door(sdev);
|
|
sdev->was_reset = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
shost_printk(KERN_INFO, shost, "waking up host to restart\n"));
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/**
|
|
* scsi_eh_ready_devs - check device ready state and recover if not.
|
|
* @shost: host to be recovered.
|
|
* @work_q: &list_head for pending commands.
|
|
* @done_q: &list_head for processed commands.
|
|
*/
|
|
void scsi_eh_ready_devs(struct Scsi_Host *shost,
|
|
struct list_head *work_q,
|
|
struct list_head *done_q)
|
|
{
|
|
if (!scsi_eh_stu(shost, work_q, done_q))
|
|
if (!scsi_eh_bus_device_reset(shost, work_q, done_q))
|
|
if (!scsi_eh_target_reset(shost, work_q, done_q))
|
|
if (!scsi_eh_bus_reset(shost, work_q, done_q))
|
|
if (!scsi_eh_host_reset(shost, work_q, done_q))
|
|
scsi_eh_offline_sdevs(work_q,
|
|
done_q);
|
|
}
|
|
EXPORT_SYMBOL_GPL(scsi_eh_ready_devs);
|
|
|
|
/**
|
|
* scsi_eh_flush_done_q - finish processed commands or retry them.
|
|
* @done_q: list_head of processed commands.
|
|
*/
|
|
void scsi_eh_flush_done_q(struct list_head *done_q)
|
|
{
|
|
struct scsi_cmnd *scmd, *next;
|
|
|
|
list_for_each_entry_safe(scmd, next, done_q, eh_entry) {
|
|
list_del_init(&scmd->eh_entry);
|
|
if (scsi_device_online(scmd->device) &&
|
|
!scsi_noretry_cmd(scmd) && scsi_cmd_retry_allowed(scmd) &&
|
|
scsi_eh_should_retry_cmd(scmd)) {
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
scmd_printk(KERN_INFO, scmd,
|
|
"%s: flush retry cmd\n",
|
|
current->comm));
|
|
scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY);
|
|
} else {
|
|
/*
|
|
* If just we got sense for the device (called
|
|
* scsi_eh_get_sense), scmd->result is already
|
|
* set, do not set DID_TIME_OUT.
|
|
*/
|
|
if (!scmd->result)
|
|
scmd->result |= (DID_TIME_OUT << 16);
|
|
SCSI_LOG_ERROR_RECOVERY(3,
|
|
scmd_printk(KERN_INFO, scmd,
|
|
"%s: flush finish cmd\n",
|
|
current->comm));
|
|
scsi_finish_command(scmd);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(scsi_eh_flush_done_q);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
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))
|
|
scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q);
|
|
|
|
spin_lock_irqsave(shost->host_lock, flags);
|
|
if (shost->eh_deadline != -1)
|
|
shost->last_reset = 0;
|
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
scsi_eh_flush_done_q(&eh_done_q);
|
|
}
|
|
|
|
/**
|
|
* scsi_error_handler - SCSI error handler thread
|
|
* @data: Host for which we are running.
|
|
*
|
|
* Notes:
|
|
* This is the main error handling loop. This is run as a kernel thread
|
|
* for every SCSI host and handles all error handling activity.
|
|
*/
|
|
int scsi_error_handler(void *data)
|
|
{
|
|
struct Scsi_Host *shost = data;
|
|
|
|
/*
|
|
* 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
|
|
* disables signal delivery for the created thread.
|
|
*/
|
|
while (true) {
|
|
/*
|
|
* The sequence in kthread_stop() sets the stop flag first
|
|
* then wakes the process. To avoid missed wakeups, the task
|
|
* should always be in a non running state before the stop
|
|
* flag is checked
|
|
*/
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (kthread_should_stop())
|
|
break;
|
|
|
|
if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) ||
|
|
shost->host_failed != scsi_host_busy(shost)) {
|
|
SCSI_LOG_ERROR_RECOVERY(1,
|
|
shost_printk(KERN_INFO, shost,
|
|
"scsi_eh_%d: sleeping\n",
|
|
shost->host_no));
|
|
schedule();
|
|
continue;
|
|
}
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
SCSI_LOG_ERROR_RECOVERY(1,
|
|
shost_printk(KERN_INFO, shost,
|
|
"scsi_eh_%d: waking up %d/%d/%d\n",
|
|
shost->host_no, shost->host_eh_scheduled,
|
|
shost->host_failed,
|
|
scsi_host_busy(shost)));
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) {
|
|
SCSI_LOG_ERROR_RECOVERY(1,
|
|
shost_printk(KERN_ERR, shost,
|
|
"scsi_eh_%d: unable to autoresume\n",
|
|
shost->host_no));
|
|
continue;
|
|
}
|
|
|
|
if (shost->transportt->eh_strategy_handler)
|
|
shost->transportt->eh_strategy_handler(shost);
|
|
else
|
|
scsi_unjam_host(shost);
|
|
|
|
/* All scmds have been handled */
|
|
shost->host_failed = 0;
|
|
|
|
/*
|
|
* 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);
|
|
if (!shost->eh_noresume)
|
|
scsi_autopm_put_host(shost);
|
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
SCSI_LOG_ERROR_RECOVERY(1,
|
|
shost_printk(KERN_INFO, shost,
|
|
"Error handler scsi_eh_%d exiting\n",
|
|
shost->host_no));
|
|
shost->ehandler = NULL;
|
|
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) {
|
|
if (channel == sdev_channel(sdev))
|
|
__scsi_report_device_reset(sdev, NULL);
|
|
}
|
|
}
|
|
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) {
|
|
if (channel == sdev_channel(sdev) &&
|
|
target == sdev_id(sdev))
|
|
__scsi_report_device_reset(sdev, NULL);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(scsi_report_device_reset);
|
|
|
|
static void
|
|
scsi_reset_provider_done_command(struct scsi_cmnd *scmd)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* scsi_ioctl_reset: explicitly reset a host/bus/target/device
|
|
* @dev: scsi_device to operate on
|
|
* @arg: reset type (see sg.h)
|
|
*/
|
|
int
|
|
scsi_ioctl_reset(struct scsi_device *dev, int __user *arg)
|
|
{
|
|
struct scsi_cmnd *scmd;
|
|
struct Scsi_Host *shost = dev->host;
|
|
struct request *rq;
|
|
unsigned long flags;
|
|
int error = 0, val;
|
|
enum scsi_disposition rtn;
|
|
|
|
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
|
|
return -EACCES;
|
|
|
|
error = get_user(val, arg);
|
|
if (error)
|
|
return error;
|
|
|
|
if (scsi_autopm_get_host(shost) < 0)
|
|
return -EIO;
|
|
|
|
error = -EIO;
|
|
rq = kzalloc(sizeof(struct request) + sizeof(struct scsi_cmnd) +
|
|
shost->hostt->cmd_size, GFP_KERNEL);
|
|
if (!rq)
|
|
goto out_put_autopm_host;
|
|
blk_rq_init(NULL, rq);
|
|
|
|
scmd = (struct scsi_cmnd *)(rq + 1);
|
|
scsi_init_command(dev, scmd);
|
|
scmd->cmnd = scsi_req(rq)->cmd;
|
|
|
|
scmd->scsi_done = scsi_reset_provider_done_command;
|
|
memset(&scmd->sdb, 0, sizeof(scmd->sdb));
|
|
|
|
scmd->cmd_len = 0;
|
|
|
|
scmd->sc_data_direction = DMA_BIDIRECTIONAL;
|
|
|
|
spin_lock_irqsave(shost->host_lock, flags);
|
|
shost->tmf_in_progress = 1;
|
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
|
|
switch (val & ~SG_SCSI_RESET_NO_ESCALATE) {
|
|
case SG_SCSI_RESET_NOTHING:
|
|
rtn = SUCCESS;
|
|
break;
|
|
case SG_SCSI_RESET_DEVICE:
|
|
rtn = scsi_try_bus_device_reset(scmd);
|
|
if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
|
|
break;
|
|
fallthrough;
|
|
case SG_SCSI_RESET_TARGET:
|
|
rtn = scsi_try_target_reset(scmd);
|
|
if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
|
|
break;
|
|
fallthrough;
|
|
case SG_SCSI_RESET_BUS:
|
|
rtn = scsi_try_bus_reset(scmd);
|
|
if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE))
|
|
break;
|
|
fallthrough;
|
|
case SG_SCSI_RESET_HOST:
|
|
rtn = scsi_try_host_reset(scmd);
|
|
if (rtn == SUCCESS)
|
|
break;
|
|
fallthrough;
|
|
default:
|
|
rtn = FAILED;
|
|
break;
|
|
}
|
|
|
|
error = (rtn == SUCCESS) ? 0 : -EIO;
|
|
|
|
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,
|
|
shost_printk(KERN_INFO, shost,
|
|
"waking up host to restart after TMF\n"));
|
|
|
|
wake_up(&shost->host_wait);
|
|
scsi_run_host_queues(shost);
|
|
|
|
kfree(rq);
|
|
|
|
out_put_autopm_host:
|
|
scsi_autopm_put_host(shost);
|
|
return error;
|
|
}
|
|
|
|
bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd,
|
|
struct scsi_sense_hdr *sshdr)
|
|
{
|
|
return scsi_normalize_sense(cmd->sense_buffer,
|
|
SCSI_SENSE_BUFFERSIZE, sshdr);
|
|
}
|
|
EXPORT_SYMBOL(scsi_command_normalize_sense);
|
|
|
|
/**
|
|
* scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format)
|
|
* @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:
|
|
* true if information field found, false if not found.
|
|
*/
|
|
bool scsi_get_sense_info_fld(const u8 *sense_buffer, int sb_len,
|
|
u64 *info_out)
|
|
{
|
|
const u8 * ucp;
|
|
|
|
if (sb_len < 7)
|
|
return false;
|
|
switch (sense_buffer[0] & 0x7f) {
|
|
case 0x70:
|
|
case 0x71:
|
|
if (sense_buffer[0] & 0x80) {
|
|
*info_out = get_unaligned_be32(&sense_buffer[3]);
|
|
return true;
|
|
}
|
|
return false;
|
|
case 0x72:
|
|
case 0x73:
|
|
ucp = scsi_sense_desc_find(sense_buffer, sb_len,
|
|
0 /* info desc */);
|
|
if (ucp && (0xa == ucp[1])) {
|
|
*info_out = get_unaligned_be64(&ucp[4]);
|
|
return true;
|
|
}
|
|
return false;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(scsi_get_sense_info_fld);
|