Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull first round of SCSI updates from James Bottomley:
 "The most important feature of this patch set is the new async
  infrastructure that makes sure async_synchronize_full() synchronizes
  all domains and allows us to remove all the hacks (like having
  scsi_complete_async_scans() in the device base code) and means that
  the async infrastructure will "just work" in future.

  The rest is assorted driver updates (aacraid, bnx2fc, virto-scsi,
  megaraid, bfa, lpfc, qla2xxx, qla4xxx) plus a lot of infrastructure
  work in sas and FC.

  Signed-off-by: James Bottomley <JBottomley@Parallels.com>"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (97 commits)
  [SCSI] Revert "[SCSI] fix async probe regression"
  [SCSI] cleanup usages of scsi_complete_async_scans
  [SCSI] queue async scan work to an async_schedule domain
  [SCSI] async: make async_synchronize_full() flush all work regardless of domain
  [SCSI] async: introduce 'async_domain' type
  [SCSI] bfa: Fix to set correct return error codes and misc cleanup.
  [SCSI] aacraid: Series 7 Async. (performance) mode support
  [SCSI] aha152x: Allow use on 64bit systems
  [SCSI] virtio-scsi: Add vdrv->scan for post VIRTIO_CONFIG_S_DRIVER_OK LUN scanning
  [SCSI] bfa: squelch lockdep complaint with a spin_lock_init
  [SCSI] qla2xxx: remove unnecessary reads of PCI_CAP_ID_EXP
  [SCSI] qla4xxx: remove unnecessary read of PCI_CAP_ID_EXP
  [SCSI] ufs: fix incorrect return value about SUCCESS and FAILED
  [SCSI] ufs: reverse the ufshcd_is_device_present logic
  [SCSI] ufs: use module_pci_driver
  [SCSI] usb-storage: update usb devices for write cache quirk in quirk list.
  [SCSI] usb-storage: add support for write cache quirk
  [SCSI] set to WCE if usb cache quirk is present.
  [SCSI] virtio-scsi: hotplug support for virtio-scsi
  [SCSI] virtio-scsi: split scatterlist per target
  ...

2 files changed, 97 insertions, 12 deletions

diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
index 48e46f5b77cc..33e422e75835 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -468,7 +468,8 @@ EXPORT_SYMBOL_GPL(scsi_dh_handler_exist);
 
 /*
  * scsi_dh_attach - Attach device handler
- * @sdev - sdev the handler should be attached to
+ * @q - Request queue that is associated with the scsi_device
+ *      the handler should be attached to
  * @name - name of the handler to attach
  */
 int scsi_dh_attach(struct request_queue *q, const char *name)
@@ -498,7 +499,8 @@ EXPORT_SYMBOL_GPL(scsi_dh_attach);
 
 /*
  * scsi_dh_detach - Detach device handler
- * @sdev - sdev the handler should be detached from
+ * @q - Request queue that is associated with the scsi_device
+ *      the handler should be detached from
  *
  * This function will detach the device handler only
  * if the sdev is not part of the internal list, ie
@@ -527,6 +529,38 @@ void scsi_dh_detach(struct request_queue *q)
 }
 EXPORT_SYMBOL_GPL(scsi_dh_detach);
 
+/*
+ * scsi_dh_attached_handler_name - Get attached device handler's name
+ * @q - Request queue that is associated with the scsi_device
+ *      that may have a device handler attached
+ * @gfp - the GFP mask used in the kmalloc() call when allocating memory
+ *
+ * Returns name of attached handler, NULL if no handler is attached.
+ * Caller must take care to free the returned string.
+ */
+const char *scsi_dh_attached_handler_name(struct request_queue *q, gfp_t gfp)
+{
+	unsigned long flags;
+	struct scsi_device *sdev;
+	const char *handler_name = NULL;
+
+	spin_lock_irqsave(q->queue_lock, flags);
+	sdev = q->queuedata;
+	if (!sdev || !get_device(&sdev->sdev_gendev))
+		sdev = NULL;
+	spin_unlock_irqrestore(q->queue_lock, flags);
+
+	if (!sdev)
+		return NULL;
+
+	if (sdev->scsi_dh_data)
+		handler_name = kstrdup(sdev->scsi_dh_data->scsi_dh->name, gfp);
+
+	put_device(&sdev->sdev_gendev);
+	return handler_name;
+}
+EXPORT_SYMBOL_GPL(scsi_dh_attached_handler_name);
+
 static struct notifier_block scsi_dh_nb = {
 	.notifier_call = scsi_dh_notifier
 };
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index fda9cdea0e60..08d80a6d272a 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -46,13 +46,16 @@
 #define TPGS_SUPPORT_OFFLINE		0x40
 #define TPGS_SUPPORT_TRANSITION		0x80
 
+#define RTPG_FMT_MASK			0x70
+#define RTPG_FMT_EXT_HDR		0x10
+
 #define TPGS_MODE_UNINITIALIZED		 -1
 #define TPGS_MODE_NONE			0x0
 #define TPGS_MODE_IMPLICIT		0x1
 #define TPGS_MODE_EXPLICIT		0x2
 
 #define ALUA_INQUIRY_SIZE		36
-#define ALUA_FAILOVER_TIMEOUT		(60 * HZ)
+#define ALUA_FAILOVER_TIMEOUT		60
 #define ALUA_FAILOVER_RETRIES		5
 
 /* flags passed from user level */
@@ -68,6 +71,7 @@ struct alua_dh_data {
 	unsigned char		inq[ALUA_INQUIRY_SIZE];
 	unsigned char		*buff;
 	int			bufflen;
+	unsigned char		transition_tmo;
 	unsigned char		sense[SCSI_SENSE_BUFFERSIZE];
 	int			senselen;
 	struct scsi_device	*sdev;
@@ -128,7 +132,7 @@ static struct request *get_alua_req(struct scsi_device *sdev,
 	rq->cmd_flags |= REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
 			 REQ_FAILFAST_DRIVER;
 	rq->retries = ALUA_FAILOVER_RETRIES;
-	rq->timeout = ALUA_FAILOVER_TIMEOUT;
+	rq->timeout = ALUA_FAILOVER_TIMEOUT * HZ;
 
 	return rq;
 }
@@ -174,7 +178,8 @@ done:
  * submit_rtpg - Issue a REPORT TARGET GROUP STATES command
  * @sdev: sdev the command should be sent to
  */
-static unsigned submit_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
+static unsigned submit_rtpg(struct scsi_device *sdev, struct alua_dh_data *h,
+			    bool rtpg_ext_hdr_req)
 {
 	struct request *rq;
 	int err = SCSI_DH_RES_TEMP_UNAVAIL;
@@ -185,7 +190,10 @@ static unsigned submit_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
 
 	/* Prepare the command. */
 	rq->cmd[0] = MAINTENANCE_IN;
-	rq->cmd[1] = MI_REPORT_TARGET_PGS;
+	if (rtpg_ext_hdr_req)
+		rq->cmd[1] = MI_REPORT_TARGET_PGS | MI_EXT_HDR_PARAM_FMT;
+	else
+		rq->cmd[1] = MI_REPORT_TARGET_PGS;
 	rq->cmd[6] = (h->bufflen >> 24) & 0xff;
 	rq->cmd[7] = (h->bufflen >> 16) & 0xff;
 	rq->cmd[8] = (h->bufflen >>  8) & 0xff;
@@ -518,11 +526,18 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
 	int len, k, off, valid_states = 0;
 	unsigned char *ucp;
 	unsigned err;
-	unsigned long expiry, interval = 1000;
+	bool rtpg_ext_hdr_req = 1;
+	unsigned long expiry, interval = 0;
+	unsigned int tpg_desc_tbl_off;
+	unsigned char orig_transition_tmo;
+
+	if (!h->transition_tmo)
+		expiry = round_jiffies_up(jiffies + ALUA_FAILOVER_TIMEOUT * HZ);
+	else
+		expiry = round_jiffies_up(jiffies + h->transition_tmo * HZ);
 
-	expiry = round_jiffies_up(jiffies + ALUA_FAILOVER_TIMEOUT);
  retry:
-	err = submit_rtpg(sdev, h);
+	err = submit_rtpg(sdev, h, rtpg_ext_hdr_req);
 
 	if (err == SCSI_DH_IO && h->senselen > 0) {
 		err = scsi_normalize_sense(h->sense, SCSI_SENSE_BUFFERSIZE,
@@ -530,6 +545,21 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
 		if (!err)
 			return SCSI_DH_IO;
 
+		/*
+		 * submit_rtpg() has failed on existing arrays
+		 * when requesting extended header info, and
+		 * the array doesn't support extended headers,
+		 * even though it shouldn't according to T10.
+		 * The retry without rtpg_ext_hdr_req set
+		 * handles this.
+		 */
+		if (rtpg_ext_hdr_req == 1 &&
+		    sense_hdr.sense_key == ILLEGAL_REQUEST &&
+		    sense_hdr.asc == 0x24 && sense_hdr.ascq == 0) {
+			rtpg_ext_hdr_req = 0;
+			goto retry;
+		}
+
 		err = alua_check_sense(sdev, &sense_hdr);
 		if (err == ADD_TO_MLQUEUE && time_before(jiffies, expiry))
 			goto retry;
@@ -556,7 +586,28 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
 		goto retry;
 	}
 
-	for (k = 4, ucp = h->buff + 4; k < len; k += off, ucp += off) {
+	orig_transition_tmo = h->transition_tmo;
+	if ((h->buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR && h->buff[5] != 0)
+		h->transition_tmo = h->buff[5];
+	else
+		h->transition_tmo = ALUA_FAILOVER_TIMEOUT;
+
+	if (orig_transition_tmo != h->transition_tmo) {
+		sdev_printk(KERN_INFO, sdev,
+			    "%s: transition timeout set to %d seconds\n",
+			    ALUA_DH_NAME, h->transition_tmo);
+		expiry = jiffies + h->transition_tmo * HZ;
+	}
+
+	if ((h->buff[4] & RTPG_FMT_MASK) == RTPG_FMT_EXT_HDR)
+		tpg_desc_tbl_off = 8;
+	else
+		tpg_desc_tbl_off = 4;
+
+	for (k = tpg_desc_tbl_off, ucp = h->buff + tpg_desc_tbl_off;
+	     k < len;
+	     k += off, ucp += off) {
+
 		if (h->group_id == (ucp[2] << 8) + ucp[3]) {
 			h->state = ucp[0] & 0x0f;
 			h->pref = ucp[0] >> 7;
@@ -581,7 +632,7 @@ static int alua_rtpg(struct scsi_device *sdev, struct alua_dh_data *h)
 	case TPGS_STATE_TRANSITIONING:
 		if (time_before(jiffies, expiry)) {
 			/* State transition, retry */
-			interval *= 2;
+			interval += 2000;
 			msleep(interval);
 			goto retry;
 		}
@@ -691,9 +742,9 @@ static int alua_activate(struct scsi_device *sdev,
 				stpg = 0;
 			break;
 		case TPGS_STATE_STANDBY:
+		case TPGS_STATE_UNAVAILABLE:
 			stpg = 1;
 			break;
-		case TPGS_STATE_UNAVAILABLE:
 		case TPGS_STATE_OFFLINE:
 			err = SCSI_DH_IO;
 			break;