---

yaml
---
r: 142739
b: refs/heads/master
c: 0a9279c
h: refs/heads/master
i:
  142737: 0e9ed54
  142735: 25d3192
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ac44e5b2ed62bf4acf9df84575d3f18c7a6fdf22
+refs/heads/master: 0a9279cc7cbe726e995c44a1acae81d446775816

trunk/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);
 

trunk/drivers/block/cciss.h

@@ -121,6 +121,8 @@ struct ctlr_info
 	struct sendcmd_reject_list scsi_rejects;
 #endif
 	unsigned char alive;
+	struct completion *rescan_wait;
+	struct task_struct *cciss_scan_thread;
 };
 
 /*  Defining the diffent access_menthods */

trunk/drivers/block/cciss_cmd.h

@@ -25,6 +25,29 @@
 #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