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>
7#include <scsi/scsi_host.h>
8
9#define SCSI_NO_TAG	(-1)    /* identify no tag in use */
10
11
12#ifdef CONFIG_BLOCK
13/**
14 * scsi_host_find_tag - find the tagged command by host
15 * @shost:	pointer to scsi_host
16 * @tag:	tag
17 *
18 * Note: for devices using multiple hardware queues tag must have been
19 * generated by blk_mq_unique_tag().
20 **/
21static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,
22		int tag)
23{
24	struct request *req = NULL;
25
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 {
37		req = blk_map_queue_find_tag(shost->bqt, tag);
38	}
39
40	if (!req)
41		return NULL;
42	return req->special;
43}
44
45#endif /* CONFIG_BLOCK */
46#endif /* _SCSI_SCSI_TCQ_H */
47