summaryrefslogtreecommitdiffstats
path: root/drivers/block/cciss.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/block/cciss.c')
-rw-r--r--drivers/block/cciss.c88
1 files changed, 86 insertions, 2 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index f15b17708537..4e5441baa49d 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -51,6 +51,7 @@
#include <scsi/scsi_ioctl.h>
#include <linux/cdrom.h>
#include <linux/scatterlist.h>
+#include <linux/kthread.h>
#define CCISS_DRIVER_VERSION(maj,min,submin) ((maj<<16)|(min<<8)|(submin))
#define DRIVER_NAME "HP CISS Driver (v 3.6.20)"
@@ -186,6 +187,8 @@ static int sendcmd_withirq(__u8 cmd, int ctlr, void *buff, size_t size,
__u8 page_code, int cmd_type);
static void fail_all_cmds(unsigned long ctlr);
+static int scan_thread(void *data);
+static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c);
#ifdef CONFIG_PROC_FS
static void cciss_procinit(int i);
@@ -735,6 +738,12 @@ static int cciss_getgeo(struct block_device *bdev, struct hd_geometry *geo)
return 0;
}
+static void check_ioctl_unit_attention(ctlr_info_t *host, CommandList_struct *c)
+{
+ if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
+ c->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION)
+ (void)check_for_unit_attention(host, c);
+}
/*
* ioctl
*/
@@ -1029,6 +1038,8 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
iocommand.buf_size,
PCI_DMA_BIDIRECTIONAL);
+ check_ioctl_unit_attention(host, c);
+
/* Copy the error information out */
iocommand.error_info = *(c->err_info);
if (copy_to_user
@@ -1180,6 +1191,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
(dma_addr_t) temp64.val, buff_size[i],
PCI_DMA_BIDIRECTIONAL);
}
+ check_ioctl_unit_attention(host, c);
/* Copy the error information out */
ioc->error_info = *(c->err_info);
if (copy_to_user(argp, ioc, sizeof(*ioc))) {
@@ -2593,12 +2605,14 @@ static inline unsigned int make_status_bytes(unsigned int scsi_status_byte,
((driver_byte & 0xff) << 24);
}
-static inline int evaluate_target_status(CommandList_struct *cmd)
+static inline int evaluate_target_status(ctlr_info_t *h,
+ CommandList_struct *cmd, int *retry_cmd)
{
unsigned char sense_key;
unsigned char status_byte, msg_byte, host_byte, driver_byte;
int error_value;
+ *retry_cmd = 0;
/* If we get in here, it means we got "target status", that is, scsi status */
status_byte = cmd->err_info->ScsiStatus;
driver_byte = DRIVER_OK;
@@ -2626,6 +2640,11 @@ static inline int evaluate_target_status(CommandList_struct *cmd)
if (((sense_key == 0x0) || (sense_key == 0x1)) && !blk_pc_request(cmd->rq))
error_value = 0;
+ if (check_for_unit_attention(h, cmd)) {
+ *retry_cmd = !blk_pc_request(cmd->rq);
+ return 0;
+ }
+
if (!blk_pc_request(cmd->rq)) { /* Not SG_IO or similar? */
if (error_value != 0)
printk(KERN_WARNING "cciss: cmd %p has CHECK CONDITION"
@@ -2665,7 +2684,7 @@ static inline void complete_command(ctlr_info_t *h, CommandList_struct *cmd,
switch (cmd->err_info->CommandStatus) {
case CMD_TARGET_STATUS:
- rq->errors = evaluate_target_status(cmd);
+ rq->errors = evaluate_target_status(h, cmd, &retry_cmd);
break;
case CMD_DATA_UNDERRUN:
if (blk_fs_request(cmd->rq)) {
@@ -3016,6 +3035,63 @@ static irqreturn_t do_cciss_intr(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static int scan_thread(void *data)
+{
+ ctlr_info_t *h = data;
+ int rc;
+ DECLARE_COMPLETION_ONSTACK(wait);
+ h->rescan_wait = &wait;
+
+ for (;;) {
+ rc = wait_for_completion_interruptible(&wait);
+ if (kthread_should_stop())
+ break;
+ if (!rc)
+ rebuild_lun_table(h, 0);
+ }
+ return 0;
+}
+
+static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c)
+{
+ if (c->err_info->SenseInfo[2] != UNIT_ATTENTION)
+ return 0;
+
+ switch (c->err_info->SenseInfo[12]) {
+ case STATE_CHANGED:
+ printk(KERN_WARNING "cciss%d: a state change "
+ "detected, command retried\n", h->ctlr);
+ return 1;
+ break;
+ case LUN_FAILED:
+ printk(KERN_WARNING "cciss%d: LUN failure "
+ "detected, action required\n", h->ctlr);
+ return 1;
+ break;
+ case REPORT_LUNS_CHANGED:
+ printk(KERN_WARNING "cciss%d: report LUN data "
+ "changed\n", h->ctlr);
+ if (h->rescan_wait)
+ complete(h->rescan_wait);
+ return 1;
+ break;
+ case POWER_OR_RESET:
+ printk(KERN_WARNING "cciss%d: a power on "
+ "or device reset detected\n", h->ctlr);
+ return 1;
+ break;
+ case UNIT_ATTENTION_CLEARED:
+ printk(KERN_WARNING "cciss%d: unit attention "
+ "cleared by another initiator\n", h->ctlr);
+ return 1;
+ break;
+ default:
+ printk(KERN_WARNING "cciss%d: unknown "
+ "unit attention detected\n", h->ctlr);
+ return 1;
+ }
+}
+
/*
* We cannot read the structure directly, for portability we must use
* the io functions.
@@ -3761,6 +3837,11 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
hba[i]->busy_initializing = 0;
rebuild_lun_table(hba[i], 1);
+ hba[i]->cciss_scan_thread = kthread_run(scan_thread, hba[i],
+ "cciss_scan%02d", i);
+ if (IS_ERR(hba[i]->cciss_scan_thread))
+ return PTR_ERR(hba[i]->cciss_scan_thread);
+
return 1;
clean4:
@@ -3836,6 +3917,7 @@ static void __devexit cciss_remove_one(struct pci_dev *pdev)
printk(KERN_ERR "cciss: Unable to remove device \n");
return;
}
+
tmp_ptr = pci_get_drvdata(pdev);
i = tmp_ptr->ctlr;
if (hba[i] == NULL) {
@@ -3844,6 +3926,8 @@ static void __devexit cciss_remove_one(struct pci_dev *pdev)
return;
}
+ kthread_stop(hba[i]->cciss_scan_thread);
+
remove_proc_entry(hba[i]->devname, proc_cciss);
unregister_blkdev(hba[i]->major, hba[i]->devname);