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Date: Wed, 11 Nov 2009 10:51:24 -0600
From: "Stephen M. Cameron" <scameron@...rdog.cce.hp.com>
To: akpm@...ux-foundation.org, James.Bottomley@...senPartnership.com
Cc: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
scameron@...rdog.cce.hp.com, mikem@...rdog.cce.hp.com
Subject: [PATCH 12/17] hpsa: decode unit attention condition and retry
commands.
hpsa: decode unit attention condition and mark commands with DID_SOFT_ERROR
to make the mid-layer retry them.
Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
Signed-off-by: Mike Miller <mikem@...rdog.cce.hp.com>
---
drivers/scsi/hpsa.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++-
drivers/scsi/hpsa_cmd.h | 23 ++++++++++++++++
2 files changed, 91 insertions(+), 1 deletions(-)
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index f893a53..6f63d45 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -149,6 +149,10 @@ static ssize_t unique_id_show(struct device *dev,
static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno);
static ssize_t host_store_rescan(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count);
+static int check_for_unit_attention(struct ctlr_info *h,
+ struct CommandList *c);
+static void check_ioctl_unit_attention(struct ctlr_info *h,
+ struct CommandList *c);
DEVICE_ATTR(raid_level, S_IRUGO, raid_level_show, NULL);
DEVICE_ATTR(lunid, S_IRUGO, lunid_show, NULL);
@@ -317,6 +321,57 @@ static int scan_thread(__attribute__((unused)) void *data)
return 0;
}
+static int check_for_unit_attention(struct ctlr_info *h,
+ struct CommandList *c)
+{
+ if (c->err_info->SenseInfo[2] != UNIT_ATTENTION)
+ return 0;
+
+ switch (c->err_info->SenseInfo[12]) {
+ case STATE_CHANGED:
+ dev_warn(&h->pdev->dev, "hpsa%d: a state change "
+ "detected, command retried\n", h->ctlr);
+ break;
+ case LUN_FAILED:
+ dev_warn(&h->pdev->dev, "hpsa%d: LUN failure "
+ "detected, action required\n", h->ctlr);
+ break;
+ case REPORT_LUNS_CHANGED:
+ dev_warn(&h->pdev->dev, "hpsa%d: report LUN data "
+ "changed\n", h->ctlr);
+ /*
+ * Here, we could call add_to_scan_list and wake up the scan thread,
+ * except that it's quite likely that we will get more than one
+ * REPORT_LUNS_CHANGED condition in quick succession, which means
+ * that those which occur after the first one will likely happen
+ * *during* the scan_thread's rescan. And the rescan code is not
+ * robust enough to restart in the middle, undoing what it has already
+ * done, and it's not clear that it's even possible to do this, since
+ * part of what it does is notify the SCSI mid layer, which starts
+ * doing it's own i/o to read partition tables and so on, and the
+ * driver doesn't have visibility to know what might need undoing.
+ * In any event, if possible, it is horribly complicated to get right
+ * so we just don't do it for now.
+ *
+ * Note: this REPORT_LUNS_CHANGED condition only occurs on the MSA2012.
+ */
+ break;
+ case POWER_OR_RESET:
+ dev_warn(&h->pdev->dev, "hpsa%d: a power on "
+ "or device reset detected\n", h->ctlr);
+ break;
+ case UNIT_ATTENTION_CLEARED:
+ dev_warn(&h->pdev->dev, "hpsa%d: unit attention "
+ "cleared by another initiator\n", h->ctlr);
+ break;
+ default:
+ dev_warn(&h->pdev->dev, "hpsa%d: unknown "
+ "unit attention detected\n", h->ctlr);
+ break;
+ }
+ return 1;
+}
+
static ssize_t host_store_rescan(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@@ -903,7 +958,10 @@ static void complete_scsi_command(struct CommandList *cp,
}
if (ei->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
-
+ if (check_for_unit_attention(h, cp)) {
+ cmd->result = DID_SOFT_ERROR << 16;
+ break;
+ }
if (sense_key == ILLEGAL_REQUEST) {
/* If ASC/ASCQ indicate Logical Unit
* Not Supported condition,
@@ -2295,6 +2353,7 @@ static int hpsa_passthru_ioctl(struct ctlr_info *h, void __user *argp)
}
hpsa_scsi_do_simple_cmd_core(h, c);
hpsa_pci_unmap(h->pdev, c, 1, PCI_DMA_BIDIRECTIONAL);
+ check_ioctl_unit_attention(h, c);
/* Copy the error information out */
memcpy(&iocommand.error_info, c->err_info,
@@ -2423,6 +2482,7 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
}
hpsa_scsi_do_simple_cmd_core(h, c);
hpsa_pci_unmap(h->pdev, c, sg_used, PCI_DMA_BIDIRECTIONAL);
+ check_ioctl_unit_attention(h, c);
/* Copy the error information out */
memcpy(&ioc->error_info, c->err_info, sizeof(ioc->error_info));
if (copy_to_user(argp, ioc, sizeof(*ioc))) {
@@ -2455,6 +2515,13 @@ cleanup1:
return status;
}
+static void check_ioctl_unit_attention(struct ctlr_info *h,
+ struct CommandList *c)
+{
+ if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
+ c->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION)
+ (void) check_for_unit_attention(h, c);
+}
/*
* ioctl
*/
diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
index 0564df2..12d7138 100644
--- a/drivers/scsi/hpsa_cmd.h
+++ b/drivers/scsi/hpsa_cmd.h
@@ -41,6 +41,29 @@
#define CMD_TIMEOUT 0x000B
#define CMD_UNABORTABLE 0x000C
+/* Unit Attentions ASC's as defined for the MSA2012sa */
+#define POWER_OR_RESET 0x29
+#define STATE_CHANGED 0x2a
+#define UNIT_ATTENTION_CLEARED 0x2f
+#define LUN_FAILED 0x3e
+#define REPORT_LUNS_CHANGED 0x3f
+
+/* Unit Attentions ASCQ's as defined for the MSA2012sa */
+
+ /* These ASCQ's defined for ASC = POWER_OR_RESET */
+#define POWER_ON_RESET 0x00
+#define POWER_ON_REBOOT 0x01
+#define SCSI_BUS_RESET 0x02
+#define MSA_TARGET_RESET 0x03
+#define CONTROLLER_FAILOVER 0x04
+#define TRANSCEIVER_SE 0x05
+#define TRANSCEIVER_LVD 0x06
+
+ /* These ASCQ's defined for ASC = STATE_CHANGED */
+#define RESERVATION_PREEMPTED 0x03
+#define ASYM_ACCESS_CHANGED 0x06
+#define LUN_CAPACITY_CHANGED 0x09
+
/* transfer direction */
#define XFER_NONE 0x00
#define XFER_WRITE 0x01
--
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