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| author | James Bottomley <James.Bottomley@steeleye.com> | 2006-08-30 15:45:51 +0200 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.il.steeleye.com> | 2006-08-31 17:18:03 +0200 |
| commit | 86e33a296c2c9ed6eece0bfff4ac776f42040504 (patch) | |
| tree | 7c4a11084b233e1899aec6c247435f3478bbd3b5 /include/scsi/scsi_tcq.h | |
| parent | [SCSI] block: add support for shared tag maps (diff) | |
| download | linux-86e33a296c2c9ed6eece0bfff4ac776f42040504.tar.xz linux-86e33a296c2c9ed6eece0bfff4ac776f42040504.zip | |
[SCSI] add shared tag map helpers
This patch adds support for sharing tag maps at the host level
(i.e. either every queue [LUN] has its own tag map or there's a single
one for the entire host). This formulation is primarily intended to
help single issue queue hardware, like the aic7xxx
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'include/scsi/scsi_tcq.h')
| -rw-r--r-- | include/scsi/scsi_tcq.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h index e47e36a4ef49..4eea254b1ce9 100644 --- a/include/scsi/scsi_tcq.h +++ b/include/scsi/scsi_tcq.h @@ -4,6 +4,7 @@ #include <linux/blkdev.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> #define MSG_SIMPLE_TAG 0x20 @@ -66,7 +67,8 @@ static inline void scsi_activate_tcq(struct scsi_device *sdev, int depth) return; if (!blk_queue_tagged(sdev->request_queue)) - blk_queue_init_tags(sdev->request_queue, depth, NULL); + blk_queue_init_tags(sdev->request_queue, depth, + sdev->host->bqt); scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); } @@ -131,4 +133,14 @@ static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag) return sdev->current_cmnd; } +/** + * scsi_init_shared_tag_map - create a shared tag map + * @shost: the host to share the tag map among all devices + * @depth: the total depth of the map + */ +static inline void scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth) +{ + shost->bqt = blk_init_tags(depth); +} + #endif /* _SCSI_SCSI_TCQ_H */ |