[mirror_ubuntu-artful-kernel.git] / include / scsi / scsi_tcq.h

#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 */
Commit	Line	Data
1da177e4 LT	1	#ifndef _SCSI_SCSI_TCQ_H
	2	#define _SCSI_SCSI_TCQ_H
	3
	4	#include <linux/blkdev.h>
	5	#include <scsi/scsi_cmnd.h>
	6	#include <scsi/scsi_device.h>
86e33a29	7	#include <scsi/scsi_host.h>
1da177e4	8
1da177e4 LT	9	#define SCSI_NO_TAG (-1) /* identify no tag in use */
	10
	11
9361401e	12	#ifdef CONFIG_BLOCK
f583f492 DS	13	/**
	14	* scsi_host_find_tag - find the tagged command by host
	15	* @shost: pointer to scsi_host
64d513ac	16	* @tag: tag
f583f492	17	*
64d513ac CH	18	* Note: for devices using multiple hardware queues tag must have been
64d513ac CH	19	* generated by blk_mq_unique_tag().
f583f492 DS	20	**/
f583f492 DS	21	static inline struct scsi_cmnd scsi_host_find_tag(struct Scsi_Host shost,
64d513ac	22	int tag)
f583f492	23	{
64d513ac	24	struct request *req = NULL;
f583f492	25
64d513ac CH	26	if (tag == SCSI_NO_TAG)
	27	return NULL;
	28
	29	if (shost_use_blk_mq(shost)) {
	30	u16 hwq = blk_mq_unique_tag_to_hwq(tag);
	31
	32	if (hwq < shost->tag_set.nr_hw_queues) {
	33	req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq],
	34	blk_mq_unique_tag_to_tag(tag));
	35	}
	36	} else {
f583f492	37	req = blk_map_queue_find_tag(shost->bqt, tag);
f583f492	38	}
64d513ac CH	39
	40	if (!req)
	41	return NULL;
	42	return req->special;
f583f492 DS	43	}
f583f492 DS	44
9361401e	45	#endif /* CONFIG_BLOCK */
1da177e4	46	#endif /* _SCSI_SCSI_TCQ_H */