scsi: always assign block layer tags if enabled

Allow a driver to ask for block layer tags by setting .use_blk_tags in the
host template, in which case it will always see a valid value in
request->tag, similar to the behavior when using blk-mq.  This means even
SCSI "untagged" commands will now have a tag, which is especially useful
when using a host-wide tag map.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>

1 files changed, 0 insertions, 34 deletions

diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index 005f68da5adb..fe4a70299419 100644
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -45,40 +45,6 @@ static inline void scsi_set_tag_type(struct scsi_device *sdev, int tag)
                 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);
-}
 
 static inline struct scsi_cmnd *scsi_mq_find_tag(struct Scsi_Host *shost,
                                                  int unique_tag)