diff options
author | Hannes Reinecke <hare@suse.de> | 2013-10-23 10:51:21 +0200 |
---|---|---|
committer | James Bottomley <JBottomley@Parallels.com> | 2013-10-25 12:17:59 +0100 |
commit | b45620229dd67ff1daffa8adce57f37b37860f78 (patch) | |
tree | 22f8577437188e6699fa9d1f05841ea1f545a68f /drivers/scsi/scsi_error.c | |
parent | 6b1e5a45d4eaa75e28f2d170ea43ab8fc6dd34d8 (diff) |
[SCSI] Add 'eh_deadline' to limit SCSI EH runtime
This patchs adds an 'eh_deadline' sysfs attribute to the scsi
host which limits the overall runtime of the SCSI EH.
The 'eh_deadline' value is stored in the now obsolete field
'resetting'.
When a command is failed the start time of the EH is stored
in 'last_reset'. If the overall runtime of the SCSI EH is longer
than last_reset + eh_deadline, the EH is short-circuited and
falls through to issue a host reset only.
[jejb: add comments in Scsi_Host about new fields]
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/scsi_error.c')
-rw-r--r-- | drivers/scsi/scsi_error.c | 130 |
1 files changed, 124 insertions, 6 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 83e591b60193..edae9e20f886 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -87,6 +87,18 @@ void scsi_schedule_eh(struct Scsi_Host *shost) } EXPORT_SYMBOL_GPL(scsi_schedule_eh); +static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) +{ + if (!shost->last_reset || !shost->eh_deadline) + return 0; + + if (time_before(jiffies, + shost->last_reset + shost->eh_deadline)) + return 0; + + return 1; +} + /** * scsi_eh_scmd_add - add scsi cmd to error handling. * @scmd: scmd to run eh on. @@ -109,6 +121,9 @@ int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) goto out_unlock; + if (shost->eh_deadline && !shost->last_reset) + shost->last_reset = jiffies; + ret = 1; scmd->eh_eflags |= eh_flag; list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); @@ -138,6 +153,9 @@ enum blk_eh_timer_return scsi_times_out(struct request *req) trace_scsi_dispatch_cmd_timeout(scmd); scsi_log_completion(scmd, TIMEOUT_ERROR); + if (host->eh_deadline && !host->last_reset) + host->last_reset = jiffies; + if (host->transportt->eh_timed_out) rtn = host->transportt->eh_timed_out(scmd); else if (host->hostt->eh_timed_out) @@ -990,13 +1008,26 @@ int scsi_eh_get_sense(struct list_head *work_q, struct list_head *done_q) { struct scsi_cmnd *scmd, *next; + struct Scsi_Host *shost; int rtn; + unsigned long flags; list_for_each_entry_safe(scmd, next, work_q, eh_entry) { if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || SCSI_SENSE_VALID(scmd)) continue; + shost = scmd->device->host; + spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_eh_past_deadline(shost)) { + spin_unlock_irqrestore(shost->host_lock, flags); + SCSI_LOG_ERROR_RECOVERY(3, + shost_printk(KERN_INFO, shost, + "skip %s, past eh deadline\n", + __func__)); + break; + } + spin_unlock_irqrestore(shost->host_lock, flags); SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, "%s: requesting sense\n", current->comm)); @@ -1082,11 +1113,28 @@ static int scsi_eh_test_devices(struct list_head *cmd_list, struct scsi_cmnd *scmd, *next; struct scsi_device *sdev; int finish_cmds; + unsigned long flags; while (!list_empty(cmd_list)) { scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); sdev = scmd->device; + if (!try_stu) { + spin_lock_irqsave(sdev->host->host_lock, flags); + if (scsi_host_eh_past_deadline(sdev->host)) { + /* Push items back onto work_q */ + list_splice_init(cmd_list, work_q); + spin_unlock_irqrestore(sdev->host->host_lock, + flags); + SCSI_LOG_ERROR_RECOVERY(3, + shost_printk(KERN_INFO, sdev->host, + "skip %s, past eh deadline", + __func__)); + break; + } + spin_unlock_irqrestore(sdev->host->host_lock, flags); + } + finish_cmds = !scsi_device_online(scmd->device) || (try_stu && !scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) || @@ -1122,14 +1170,28 @@ static int scsi_eh_abort_cmds(struct list_head *work_q, struct scsi_cmnd *scmd, *next; LIST_HEAD(check_list); int rtn; + struct Scsi_Host *shost; + unsigned long flags; list_for_each_entry_safe(scmd, next, work_q, eh_entry) { if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) continue; + shost = scmd->device->host; + spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_eh_past_deadline(shost)) { + spin_unlock_irqrestore(shost->host_lock, flags); + list_splice_init(&check_list, work_q); + SCSI_LOG_ERROR_RECOVERY(3, + shost_printk(KERN_INFO, shost, + "skip %s, past eh deadline\n", + __func__)); + return list_empty(work_q); + } + spin_unlock_irqrestore(shost->host_lock, flags); SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" "0x%p\n", current->comm, scmd)); - rtn = scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd); + rtn = scsi_try_to_abort_cmd(shost->hostt, scmd); if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; if (rtn == FAST_IO_FAIL) @@ -1187,8 +1249,19 @@ static int scsi_eh_stu(struct Scsi_Host *shost, { struct scsi_cmnd *scmd, *stu_scmd, *next; struct scsi_device *sdev; + unsigned long flags; shost_for_each_device(sdev, shost) { + spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_eh_past_deadline(shost)) { + spin_unlock_irqrestore(shost->host_lock, flags); + SCSI_LOG_ERROR_RECOVERY(3, + shost_printk(KERN_INFO, shost, + "skip %s, past eh deadline\n", + __func__)); + break; + } + spin_unlock_irqrestore(shost->host_lock, flags); stu_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && @@ -1241,9 +1314,20 @@ static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, { struct scsi_cmnd *scmd, *bdr_scmd, *next; struct scsi_device *sdev; + unsigned long flags; int rtn; shost_for_each_device(sdev, shost) { + spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_eh_past_deadline(shost)) { + spin_unlock_irqrestore(shost->host_lock, flags); + SCSI_LOG_ERROR_RECOVERY(3, + shost_printk(KERN_INFO, shost, + "skip %s, past eh deadline\n", + __func__)); + break; + } + spin_unlock_irqrestore(shost->host_lock, flags); bdr_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) if (scmd->device == sdev) { @@ -1303,6 +1387,21 @@ static int scsi_eh_target_reset(struct Scsi_Host *shost, struct scsi_cmnd *next, *scmd; int rtn; unsigned int id; + unsigned long flags; + + spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_eh_past_deadline(shost)) { + spin_unlock_irqrestore(shost->host_lock, flags); + /* push back on work queue for further processing */ + list_splice_init(&check_list, work_q); + list_splice_init(&tmp_list, work_q); + SCSI_LOG_ERROR_RECOVERY(3, + shost_printk(KERN_INFO, shost, + "skip %s, past eh deadline\n", + __func__)); + return list_empty(work_q); + } + spin_unlock_irqrestore(shost->host_lock, flags); scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); id = scmd_id(scmd); @@ -1347,6 +1446,7 @@ static int scsi_eh_bus_reset(struct Scsi_Host *shost, LIST_HEAD(check_list); unsigned int channel; int rtn; + unsigned long flags; /* * we really want to loop over the various channels, and do this on @@ -1356,6 +1456,18 @@ static int scsi_eh_bus_reset(struct Scsi_Host *shost, */ for (channel = 0; channel <= shost->max_channel; channel++) { + spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_eh_past_deadline(shost)) { + spin_unlock_irqrestore(shost->host_lock, flags); + list_splice_init(&check_list, work_q); + SCSI_LOG_ERROR_RECOVERY(3, + shost_printk(KERN_INFO, shost, + "skip %s, past eh deadline\n", + __func__)); + return list_empty(work_q); + } + spin_unlock_irqrestore(shost->host_lock, flags); + chan_scmd = NULL; list_for_each_entry(scmd, work_q, eh_entry) { if (channel == scmd_channel(scmd)) { @@ -1755,8 +1867,9 @@ static void scsi_restart_operations(struct Scsi_Host *shost) * will be requests for character device operations, and also for * ioctls to queued block devices. */ - SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", - __func__)); + SCSI_LOG_ERROR_RECOVERY(3, + printk("scsi_eh_%d waking up host to restart\n", + shost->host_no)); spin_lock_irqsave(shost->host_lock, flags); if (scsi_host_set_state(shost, SHOST_RUNNING)) @@ -1883,6 +1996,10 @@ static void scsi_unjam_host(struct Scsi_Host *shost) if (!scsi_eh_abort_cmds(&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) + shost->last_reset = 0; + spin_unlock_irqrestore(shost->host_lock, flags); scsi_eh_flush_done_q(&eh_done_q); } @@ -1909,7 +2026,7 @@ int scsi_error_handler(void *data) if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || shost->host_failed != shost->host_busy) { SCSI_LOG_ERROR_RECOVERY(1, - printk("Error handler scsi_eh_%d sleeping\n", + printk("scsi_eh_%d: sleeping\n", shost->host_no)); schedule(); continue; @@ -1917,8 +2034,9 @@ int scsi_error_handler(void *data) __set_current_state(TASK_RUNNING); SCSI_LOG_ERROR_RECOVERY(1, - printk("Error handler scsi_eh_%d waking up\n", - shost->host_no)); + printk("scsi_eh_%d: waking up %d/%d/%d\n", + shost->host_no, shost->host_eh_scheduled, + shost->host_failed, shost->host_busy)); /* * We have a host that is failing for some reason. Figure out |