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block: support different tag allocation policy

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The libata tag allocation is using a round-robin policy. Next patch will
make libata use block generic tag allocation, so let's add a policy to
tag allocation.

Currently two policies: FIFO (default) and round-robin.

Cc: Jens Axboe <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Shaohua Li <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Shaohua Li 2015-01-15 17:32:25 -08:00 • committed by Jens Axboe
commit ee1b6f7aff
6 changed files with 39 additions and 13 deletions
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3
include/scsi/scsi_host.h
View file

@ -402,6 +402,9 @@ struct scsi_host_template {
*/
unsigned char present;
/* If use block layer to manage tags, this is tag allocation policy */
int tag_alloc_policy;
/*
* Let the block layer assigns tags to all commands.
*/

3
include/scsi/scsi_tcq.h
View file

@ -66,7 +66,8 @@ static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
* devices on the shared host (for libata)
*/
if (!shost->bqt) {
shost->bqt = blk_init_tags(depth);
shost->bqt = blk_init_tags(depth,
shost->hostt->tag_alloc_policy);
if (!shost->bqt)
return -ENOMEM;
}