scsi: hpsa: correct device resets
Correct a race condition that occurs between the reset handler and the
completion handler. There are times when the wait_event condition is
never met due to this race condition and the reset never completes.
The reset_pending field is NULL initially.
t Reset Handler Thread Completion Thread
-- -------------------- -----------------
t1 if (c->reset_pending)
t2 c->reset_pending = dev; if (atomic_dev_and_test(counter))
t3 atomic_inc(counter) wait_up_all(event_sync_wait_queue)
t4
t5 wait_event(...counter == 0)
Kernel.org Bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=1994350
Bug 199435 - HPSA + P420i resetting logical Direct-Access
never complete
Reviewed-by: Justin Lindley <justin.lindley@microsemi.com>
Reviewed-by: David Carroll <david.carroll@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Don Brace
Martin K. Petersen
Родитель
9e33f0d578
Коммит
c5dfd10641
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@ -346,11 +346,6 @@ static inline bool hpsa_is_cmd_idle(struct CommandList *c)
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return c->scsi_cmd == SCSI_CMD_IDLE;
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}
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static inline bool hpsa_is_pending_event(struct CommandList *c)
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{
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return c->reset_pending;
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}
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/* extract sense key, asc, and ascq from sense data. -1 means invalid. */
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static void decode_sense_data(const u8 *sense_data, int sense_data_len,
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u8 *sense_key, u8 *asc, u8 *ascq)
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@ -1146,6 +1141,8 @@ static void __enqueue_cmd_and_start_io(struct ctlr_info *h,
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{
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dial_down_lockup_detection_during_fw_flash(h, c);
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atomic_inc(&h->commands_outstanding);
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if (c->device)
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atomic_inc(&c->device->commands_outstanding);
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reply_queue = h->reply_map[raw_smp_processor_id()];
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switch (c->cmd_type) {
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@ -1169,9 +1166,6 @@ static void __enqueue_cmd_and_start_io(struct ctlr_info *h,
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static void enqueue_cmd_and_start_io(struct ctlr_info *h, struct CommandList *c)
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{
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if (unlikely(hpsa_is_pending_event(c)))
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return finish_cmd(c);
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__enqueue_cmd_and_start_io(h, c, DEFAULT_REPLY_QUEUE);
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}
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@ -2434,13 +2428,16 @@ static int handle_ioaccel_mode2_error(struct ctlr_info *h,
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break;
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}
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if (dev->in_reset)
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retry = 0;
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return retry; /* retry on raid path? */
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}
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static void hpsa_cmd_resolve_events(struct ctlr_info *h,
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struct CommandList *c)
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{
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bool do_wake = false;
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struct hpsa_scsi_dev_t *dev = c->device;
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/*
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* Reset c->scsi_cmd here so that the reset handler will know
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@ -2449,25 +2446,12 @@ static void hpsa_cmd_resolve_events(struct ctlr_info *h,
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*/
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c->scsi_cmd = SCSI_CMD_IDLE;
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mb(); /* Declare command idle before checking for pending events. */
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if (c->reset_pending) {
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unsigned long flags;
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struct hpsa_scsi_dev_t *dev;
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/*
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* There appears to be a reset pending; lock the lock and
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* reconfirm. If so, then decrement the count of outstanding
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* commands and wake the reset command if this is the last one.
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*/
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spin_lock_irqsave(&h->lock, flags);
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dev = c->reset_pending; /* Re-fetch under the lock. */
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if (dev && atomic_dec_and_test(&dev->reset_cmds_out))
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do_wake = true;
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c->reset_pending = NULL;
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spin_unlock_irqrestore(&h->lock, flags);
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if (dev) {
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atomic_dec(&dev->commands_outstanding);
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if (dev->in_reset &&
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atomic_read(&dev->commands_outstanding) <= 0)
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wake_up_all(&h->event_sync_wait_queue);
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}
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if (do_wake)
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wake_up_all(&h->event_sync_wait_queue);
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}
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static void hpsa_cmd_resolve_and_free(struct ctlr_info *h,
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@ -2516,6 +2500,11 @@ static void process_ioaccel2_completion(struct ctlr_info *h,
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dev->offload_to_be_enabled = 0;
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}
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if (dev->in_reset) {
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cmd->result = DID_RESET << 16;
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return hpsa_cmd_free_and_done(h, c, cmd);
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}
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return hpsa_retry_cmd(h, c);
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}
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@ -2621,10 +2610,6 @@ static void complete_scsi_command(struct CommandList *cp)
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return hpsa_cmd_free_and_done(h, cp, cmd);
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}
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if ((unlikely(hpsa_is_pending_event(cp))))
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if (cp->reset_pending)
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return hpsa_cmd_free_and_done(h, cp, cmd);
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if (cp->cmd_type == CMD_IOACCEL2)
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return process_ioaccel2_completion(h, cp, cmd, dev);
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@ -3074,7 +3059,7 @@ out:
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return rc;
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}
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static int hpsa_send_reset(struct ctlr_info *h, unsigned char *scsi3addr,
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static int hpsa_send_reset(struct ctlr_info *h, struct hpsa_scsi_dev_t *dev,
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u8 reset_type, int reply_queue)
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{
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int rc = IO_OK;
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@ -3082,11 +3067,10 @@ static int hpsa_send_reset(struct ctlr_info *h, unsigned char *scsi3addr,
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struct ErrorInfo *ei;
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c = cmd_alloc(h);
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c->device = dev;
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/* fill_cmd can't fail here, no data buffer to map. */
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(void) fill_cmd(c, reset_type, h, NULL, 0, 0,
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scsi3addr, TYPE_MSG);
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(void) fill_cmd(c, reset_type, h, NULL, 0, 0, dev->scsi3addr, TYPE_MSG);
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rc = hpsa_scsi_do_simple_cmd(h, c, reply_queue, NO_TIMEOUT);
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if (rc) {
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dev_warn(&h->pdev->dev, "Failed to send reset command\n");
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@ -3164,9 +3148,8 @@ static bool hpsa_cmd_dev_match(struct ctlr_info *h, struct CommandList *c,
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}
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static int hpsa_do_reset(struct ctlr_info *h, struct hpsa_scsi_dev_t *dev,
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unsigned char *scsi3addr, u8 reset_type, int reply_queue)
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u8 reset_type, int reply_queue)
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{
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int i;
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int rc = 0;
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/* We can really only handle one reset at a time */
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@ -3175,38 +3158,14 @@ static int hpsa_do_reset(struct ctlr_info *h, struct hpsa_scsi_dev_t *dev,
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return -EINTR;
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}
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BUG_ON(atomic_read(&dev->reset_cmds_out) != 0);
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for (i = 0; i < h->nr_cmds; i++) {
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struct CommandList *c = h->cmd_pool + i;
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int refcount = atomic_inc_return(&c->refcount);
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if (refcount > 1 && hpsa_cmd_dev_match(h, c, dev, scsi3addr)) {
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unsigned long flags;
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/*
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* Mark the target command as having a reset pending,
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* then lock a lock so that the command cannot complete
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* while we're considering it. If the command is not
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* idle then count it; otherwise revoke the event.
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*/
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c->reset_pending = dev;
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spin_lock_irqsave(&h->lock, flags); /* Implied MB */
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if (!hpsa_is_cmd_idle(c))
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atomic_inc(&dev->reset_cmds_out);
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else
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c->reset_pending = NULL;
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spin_unlock_irqrestore(&h->lock, flags);
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}
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cmd_free(h, c);
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}
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rc = hpsa_send_reset(h, scsi3addr, reset_type, reply_queue);
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if (!rc)
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rc = hpsa_send_reset(h, dev, reset_type, reply_queue);
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if (!rc) {
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/* incremented by sending the reset request */
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atomic_dec(&dev->commands_outstanding);
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wait_event(h->event_sync_wait_queue,
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atomic_read(&dev->reset_cmds_out) == 0 ||
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atomic_read(&dev->commands_outstanding) <= 0 ||
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lockup_detected(h));
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}
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if (unlikely(lockup_detected(h))) {
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dev_warn(&h->pdev->dev,
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@ -3214,10 +3173,8 @@ static int hpsa_do_reset(struct ctlr_info *h, struct hpsa_scsi_dev_t *dev,
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rc = -ENODEV;
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}
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if (unlikely(rc))
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atomic_set(&dev->reset_cmds_out, 0);
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else
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rc = wait_for_device_to_become_ready(h, scsi3addr, 0);
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if (!rc)
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rc = wait_for_device_to_become_ready(h, dev->scsi3addr, 0);
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mutex_unlock(&h->reset_mutex);
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return rc;
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@ -4846,6 +4803,9 @@ static int hpsa_scsi_ioaccel_direct_map(struct ctlr_info *h,
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c->phys_disk = dev;
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if (dev->in_reset)
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return -1;
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return hpsa_scsi_ioaccel_queue_command(h, c, dev->ioaccel_handle,
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cmd->cmnd, cmd->cmd_len, dev->scsi3addr, dev);
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}
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@ -5031,6 +4991,11 @@ static int hpsa_scsi_ioaccel2_queue_command(struct ctlr_info *h,
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} else
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cp->sg_count = (u8) use_sg;
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if (phys_disk->in_reset) {
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cmd->result = DID_RESET << 16;
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return -1;
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}
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enqueue_cmd_and_start_io(h, c);
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return 0;
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}
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@ -5048,6 +5013,9 @@ static int hpsa_scsi_ioaccel_queue_command(struct ctlr_info *h,
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if (!c->scsi_cmd->device->hostdata)
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return -1;
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if (phys_disk->in_reset)
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return -1;
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/* Try to honor the device's queue depth */
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if (atomic_inc_return(&phys_disk->ioaccel_cmds_out) >
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phys_disk->queue_depth) {
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@ -5131,6 +5099,9 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_info *h,
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if (!dev)
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return -1;
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if (dev->in_reset)
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return -1;
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/* check for valid opcode, get LBA and block count */
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switch (cmd->cmnd[0]) {
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case WRITE_6:
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@ -5435,13 +5406,13 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_info *h,
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*/
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static int hpsa_ciss_submit(struct ctlr_info *h,
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struct CommandList *c, struct scsi_cmnd *cmd,
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unsigned char scsi3addr[])
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struct hpsa_scsi_dev_t *dev)
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{
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cmd->host_scribble = (unsigned char *) c;
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c->cmd_type = CMD_SCSI;
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c->scsi_cmd = cmd;
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c->Header.ReplyQueue = 0; /* unused in simple mode */
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memcpy(&c->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
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memcpy(&c->Header.LUN.LunAddrBytes[0], &dev->scsi3addr[0], 8);
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c->Header.tag = cpu_to_le64((c->cmdindex << DIRECT_LOOKUP_SHIFT));
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/* Fill in the request block... */
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@ -5492,6 +5463,12 @@ static int hpsa_ciss_submit(struct ctlr_info *h,
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hpsa_cmd_resolve_and_free(h, c);
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return SCSI_MLQUEUE_HOST_BUSY;
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}
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if (dev->in_reset) {
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hpsa_cmd_resolve_and_free(h, c);
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return SCSI_MLQUEUE_HOST_BUSY;
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}
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enqueue_cmd_and_start_io(h, c);
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/* the cmd'll come back via intr handler in complete_scsi_command() */
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return 0;
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@ -5543,8 +5520,7 @@ static inline void hpsa_cmd_partial_init(struct ctlr_info *h, int index,
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}
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static int hpsa_ioaccel_submit(struct ctlr_info *h,
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struct CommandList *c, struct scsi_cmnd *cmd,
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unsigned char *scsi3addr)
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struct CommandList *c, struct scsi_cmnd *cmd)
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{
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struct hpsa_scsi_dev_t *dev = cmd->device->hostdata;
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int rc = IO_ACCEL_INELIGIBLE;
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@ -5552,6 +5528,9 @@ static int hpsa_ioaccel_submit(struct ctlr_info *h,
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if (!dev)
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return SCSI_MLQUEUE_HOST_BUSY;
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if (dev->in_reset)
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return SCSI_MLQUEUE_HOST_BUSY;
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if (hpsa_simple_mode)
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return IO_ACCEL_INELIGIBLE;
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@ -5587,8 +5566,12 @@ static void hpsa_command_resubmit_worker(struct work_struct *work)
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cmd->result = DID_NO_CONNECT << 16;
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return hpsa_cmd_free_and_done(c->h, c, cmd);
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}
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if (c->reset_pending)
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if (dev->in_reset) {
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cmd->result = DID_RESET << 16;
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return hpsa_cmd_free_and_done(c->h, c, cmd);
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}
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if (c->cmd_type == CMD_IOACCEL2) {
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struct ctlr_info *h = c->h;
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struct io_accel2_cmd *c2 = &h->ioaccel2_cmd_pool[c->cmdindex];
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@ -5596,7 +5579,7 @@ static void hpsa_command_resubmit_worker(struct work_struct *work)
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if (c2->error_data.serv_response ==
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IOACCEL2_STATUS_SR_TASK_COMP_SET_FULL) {
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rc = hpsa_ioaccel_submit(h, c, cmd, dev->scsi3addr);
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rc = hpsa_ioaccel_submit(h, c, cmd);
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if (rc == 0)
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return;
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if (rc == SCSI_MLQUEUE_HOST_BUSY) {
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@ -5612,7 +5595,7 @@ static void hpsa_command_resubmit_worker(struct work_struct *work)
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}
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}
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hpsa_cmd_partial_init(c->h, c->cmdindex, c);
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if (hpsa_ciss_submit(c->h, c, cmd, dev->scsi3addr)) {
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if (hpsa_ciss_submit(c->h, c, cmd, dev)) {
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/*
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* If we get here, it means dma mapping failed. Try
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* again via scsi mid layer, which will then get
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@ -5631,7 +5614,6 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
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{
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struct ctlr_info *h;
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struct hpsa_scsi_dev_t *dev;
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unsigned char scsi3addr[8];
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struct CommandList *c;
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int rc = 0;
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@ -5653,13 +5635,15 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
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return 0;
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}
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memcpy(scsi3addr, dev->scsi3addr, sizeof(scsi3addr));
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if (unlikely(lockup_detected(h))) {
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cmd->result = DID_NO_CONNECT << 16;
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cmd->scsi_done(cmd);
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return 0;
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}
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if (dev->in_reset)
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return SCSI_MLQUEUE_DEVICE_BUSY;
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c = cmd_tagged_alloc(h, cmd);
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if (c == NULL)
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return SCSI_MLQUEUE_DEVICE_BUSY;
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|
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@ -5671,7 +5655,7 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
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if (likely(cmd->retries == 0 &&
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!blk_rq_is_passthrough(cmd->request) &&
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h->acciopath_status)) {
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rc = hpsa_ioaccel_submit(h, c, cmd, scsi3addr);
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rc = hpsa_ioaccel_submit(h, c, cmd);
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if (rc == 0)
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return 0;
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if (rc == SCSI_MLQUEUE_HOST_BUSY) {
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@ -5679,7 +5663,7 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
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return SCSI_MLQUEUE_HOST_BUSY;
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}
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}
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return hpsa_ciss_submit(h, c, cmd, scsi3addr);
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return hpsa_ciss_submit(h, c, cmd, dev);
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}
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static void hpsa_scan_complete(struct ctlr_info *h)
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|
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@ -5961,6 +5945,7 @@ static int wait_for_device_to_become_ready(struct ctlr_info *h,
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static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
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{
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int rc = SUCCESS;
|
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int i;
|
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struct ctlr_info *h;
|
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struct hpsa_scsi_dev_t *dev;
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u8 reset_type;
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|
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@ -6028,9 +6013,19 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
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reset_type == HPSA_DEVICE_RESET_MSG ? "logical " : "physical ");
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hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
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/*
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* wait to see if any commands will complete before sending reset
|
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*/
|
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dev->in_reset = true; /* block any new cmds from OS for this device */
|
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for (i = 0; i < 10; i++) {
|
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if (atomic_read(&dev->commands_outstanding) > 0)
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msleep(1000);
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else
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break;
|
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}
|
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|
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/* send a reset to the SCSI LUN which the command was sent to */
|
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rc = hpsa_do_reset(h, dev, dev->scsi3addr, reset_type,
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||||
DEFAULT_REPLY_QUEUE);
|
||||
rc = hpsa_do_reset(h, dev, reset_type, DEFAULT_REPLY_QUEUE);
|
||||
if (rc == 0)
|
||||
rc = SUCCESS;
|
||||
else
|
||||
|
|
@ -6044,6 +6039,8 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
|
|||
return_reset_status:
|
||||
spin_lock_irqsave(&h->reset_lock, flags);
|
||||
h->reset_in_progress = 0;
|
||||
if (dev)
|
||||
dev->in_reset = false;
|
||||
spin_unlock_irqrestore(&h->reset_lock, flags);
|
||||
return rc;
|
||||
}
|
||||
|
|
@ -6157,6 +6154,7 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h)
|
|||
break; /* it's ours now. */
|
||||
}
|
||||
hpsa_cmd_partial_init(h, i, c);
|
||||
c->device = NULL;
|
||||
return c;
|
||||
}
|
||||
|
||||
|
|
@ -6610,8 +6608,7 @@ static int hpsa_ioctl(struct scsi_device *dev, unsigned int cmd,
|
|||
}
|
||||
}
|
||||
|
||||
static void hpsa_send_host_reset(struct ctlr_info *h, unsigned char *scsi3addr,
|
||||
u8 reset_type)
|
||||
static void hpsa_send_host_reset(struct ctlr_info *h, u8 reset_type)
|
||||
{
|
||||
struct CommandList *c;
|
||||
|
||||
|
|
@ -8105,7 +8102,7 @@ static int hpsa_request_irqs(struct ctlr_info *h,
|
|||
static int hpsa_kdump_soft_reset(struct ctlr_info *h)
|
||||
{
|
||||
int rc;
|
||||
hpsa_send_host_reset(h, RAID_CTLR_LUNID, HPSA_RESET_TYPE_CONTROLLER);
|
||||
hpsa_send_host_reset(h, HPSA_RESET_TYPE_CONTROLLER);
|
||||
|
||||
dev_info(&h->pdev->dev, "Waiting for board to soft reset.\n");
|
||||
rc = hpsa_wait_for_board_state(h->pdev, h->vaddr, BOARD_NOT_READY);
|
||||
|
|
|
|||
|
|
@ -76,11 +76,12 @@ struct hpsa_scsi_dev_t {
|
|||
unsigned char raid_level; /* from inquiry page 0xC1 */
|
||||
unsigned char volume_offline; /* discovered via TUR or VPD */
|
||||
u16 queue_depth; /* max queue_depth for this device */
|
||||
atomic_t reset_cmds_out; /* Count of commands to-be affected */
|
||||
atomic_t commands_outstanding; /* track commands sent to device */
|
||||
atomic_t ioaccel_cmds_out; /* Only used for physical devices
|
||||
* counts commands sent to physical
|
||||
* device via "ioaccel" path.
|
||||
*/
|
||||
bool in_reset;
|
||||
u32 ioaccel_handle;
|
||||
u8 active_path_index;
|
||||
u8 path_map;
|
||||
|
|
|
|||
|
|
@ -448,7 +448,7 @@ struct CommandList {
|
|||
struct hpsa_scsi_dev_t *phys_disk;
|
||||
|
||||
int abort_pending;
|
||||
struct hpsa_scsi_dev_t *reset_pending;
|
||||
struct hpsa_scsi_dev_t *device;
|
||||
atomic_t refcount; /* Must be last to avoid memset in hpsa_cmd_init() */
|
||||
} __aligned(COMMANDLIST_ALIGNMENT);
|
||||
|
||||
|
|
|
|||
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