64d513ac31
This patch changes the !blk-mq path to the same defaults as the blk-mq I/O path by always enabling block tagging, and always using host wide tags. We've had blk-mq available for a few releases so bugs with this mode should have been ironed out, and this ensures we get better coverage of over tagging setup over different configs. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Odin.com>
47 lines
1,005 B
C
47 lines
1,005 B
C
#ifndef _SCSI_SCSI_TCQ_H
|
|
#define _SCSI_SCSI_TCQ_H
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_host.h>
|
|
|
|
#define SCSI_NO_TAG (-1) /* identify no tag in use */
|
|
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
/**
|
|
* scsi_host_find_tag - find the tagged command by host
|
|
* @shost: pointer to scsi_host
|
|
* @tag: tag
|
|
*
|
|
* Note: for devices using multiple hardware queues tag must have been
|
|
* generated by blk_mq_unique_tag().
|
|
**/
|
|
static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,
|
|
int tag)
|
|
{
|
|
struct request *req = NULL;
|
|
|
|
if (tag == SCSI_NO_TAG)
|
|
return NULL;
|
|
|
|
if (shost_use_blk_mq(shost)) {
|
|
u16 hwq = blk_mq_unique_tag_to_hwq(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(tag));
|
|
}
|
|
} else {
|
|
req = blk_map_queue_find_tag(shost->bqt, tag);
|
|
}
|
|
|
|
if (!req)
|
|
return NULL;
|
|
return req->special;
|
|
}
|
|
|
|
#endif /* CONFIG_BLOCK */
|
|
#endif /* _SCSI_SCSI_TCQ_H */
|