Merge tag 'arc-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

[firefly-linux-kernel-4.4.55.git] / include / scsi / scsi_tcq.h

diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index 56ed843969ca8211deedb7ea564d0b96ee74e03b..fe4a70299419cedc7160b08942bce7367517f3ab 100644 (file)
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -16,20 +16,16 @@
 
 #ifdef CONFIG_BLOCK
 
+int scsi_change_queue_type(struct scsi_device *sdev, int tag_type);
+
 /**
  * scsi_get_tag_type - get the type of tag the device supports
  * @sdev:      the scsi device
- *
- * Notes:
- *     If the drive only supports simple tags, returns MSG_SIMPLE_TAG
- *     if it supports all tag types, returns MSG_ORDERED_TAG.
  */
 static inline int scsi_get_tag_type(struct scsi_device *sdev)
 {
        if (!sdev->tagged_supported)
                return 0;
-       if (sdev->ordered_tags)
-               return MSG_ORDERED_TAG;
        if (sdev->simple_tags)
                return MSG_SIMPLE_TAG;
        return 0;
@@ -39,90 +35,33 @@ static inline void scsi_set_tag_type(struct scsi_device *sdev, int tag)
 {
        switch (tag) {
        case MSG_ORDERED_TAG:
-               sdev->ordered_tags = 1;
-               /* fall through */
        case MSG_SIMPLE_TAG:
                sdev->simple_tags = 1;
                break;
        case 0:
                /* fall through */
        default:
-               sdev->ordered_tags = 0;
                sdev->simple_tags = 0;
                break;
        }
 }
-/**
- * scsi_activate_tcq - turn on tag command queueing
- * @SDpnt:     device to turn on TCQ for
- * @depth:     queue depth
- *
- * Notes:
- *     Eventually, I hope depth would be the maximum depth
- *     the device could cope with and the real queue depth
- *     would be adjustable from 0 to depth.
- **/
-static inline void scsi_activate_tcq(struct scsi_device *sdev, int depth)
-{
-       if (!sdev->tagged_supported)
-               return;
-
-       if (shost_use_blk_mq(sdev->host))
-               queue_flag_set_unlocked(QUEUE_FLAG_QUEUED, sdev->request_queue);
-       else if (!blk_queue_tagged(sdev->request_queue))
-               blk_queue_init_tags(sdev->request_queue, depth,
-                                   sdev->host->bqt);
-
-       scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
-}
-
-/**
- * scsi_deactivate_tcq - turn off tag command queueing
- * @SDpnt:     device to turn off TCQ for
- **/
-static inline void scsi_deactivate_tcq(struct scsi_device *sdev, int depth)
-{
-       if (blk_queue_tagged(sdev->request_queue))
-               blk_queue_free_tags(sdev->request_queue);
-       scsi_adjust_queue_depth(sdev, 0, depth);
-}
-
-/**
- * scsi_populate_tag_msg - place a tag message in a buffer
- * @SCpnt:     pointer to the Scsi_Cmnd for the tag
- * @msg:       pointer to the area to place the tag
- *
- * Notes:
- *     designed to create the correct type of tag message for the 
- *     particular request.  Returns the size of the tag message.
- *     May return 0 if TCQ is disabled for this device.
- **/
-static inline int scsi_populate_tag_msg(struct scsi_cmnd *cmd, char *msg)
-{
-        struct request *req = cmd->request;
-
-        if (blk_rq_tagged(req)) {
-               *msg++ = MSG_SIMPLE_TAG;
-               *msg++ = req->tag;
-               return 2;
-       }
-
-       return 0;
-}
 
 static inline struct scsi_cmnd *scsi_mq_find_tag(struct Scsi_Host *shost,
-               unsigned int hw_ctx, int tag)
+                                                int unique_tag)
 {
-       struct request *req;
+       u16 hwq = blk_mq_unique_tag_to_hwq(unique_tag);
+       struct request *req = NULL;
 
-       req = blk_mq_tag_to_rq(shost->tag_set.tags[hw_ctx], tag);
+       if (hwq < shost->tag_set.nr_hw_queues)
+               req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq],
+                                      blk_mq_unique_tag_to_tag(unique_tag));
        return req ? (struct scsi_cmnd *)req->special : NULL;
 }
 
 /**
  * scsi_find_tag - find a tagged command by device
  * @SDpnt:     pointer to the ScSI device
- * @tag:       the tag number
+ * @tag:       tag generated by blk_mq_unique_tag()
  *
  * Notes:
  *     Only works with tags allocated by the generic blk layer.
@@ -133,9 +72,9 @@ static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag)
 
         if (tag != SCSI_NO_TAG) {
                if (shost_use_blk_mq(sdev->host))
-                       return scsi_mq_find_tag(sdev->host, 0, tag);
+                       return scsi_mq_find_tag(sdev->host, tag);
 
-               req = blk_queue_find_tag(sdev->request_queue, tag);
+               req = blk_queue_find_tag(sdev->request_queue, tag);
                return req ? (struct scsi_cmnd *)req->special : NULL;
        }
 
@@ -174,7 +113,7 @@ static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
 /**
  * scsi_host_find_tag - find the tagged command by host
  * @shost:     pointer to scsi_host
- * @tag:       tag of the scsi_cmnd
+ * @tag:       tag generated by blk_mq_unique_tag()
  *
  * Notes:
  *     Only works with tags allocated by the generic blk layer.
@@ -186,7 +125,7 @@ static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,
 
        if (tag != SCSI_NO_TAG) {
                if (shost_use_blk_mq(shost))
-                       return scsi_mq_find_tag(shost, 0, tag);
+                       return scsi_mq_find_tag(shost, tag);
                req = blk_map_queue_find_tag(shost->bqt, tag);
                return req ? (struct scsi_cmnd *)req->special : NULL;
        }