1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _SCSI_SCSI_TCQ_H
3 #define _SCSI_SCSI_TCQ_H
4
5 #include <linux/blkdev.h>
6 #include <scsi/scsi_cmnd.h>
7 #include <scsi/scsi_device.h>
8 #include <scsi/scsi_host.h>
9
10 #define SCSI_NO_TAG (-1) /* identify no tag in use */
11
12
13 #ifdef CONFIG_BLOCK
14 /**
15 * scsi_host_find_tag - find the tagged command by host
16 * @shost: pointer to scsi_host
17 * @tag: tag
18 *
19 * Note: for devices using multiple hardware queues tag must have been
20 * generated by blk_mq_unique_tag().
21 **/
22 static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,
23 int tag)
24 {
25 struct request *req = NULL;
26 u16 hwq;
27
28 if (tag == SCSI_NO_TAG)
29 return NULL;
30
31 hwq = blk_mq_unique_tag_to_hwq(tag);
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
37 if (!req || !blk_mq_request_started(req))
38 return NULL;
39 return blk_mq_rq_to_pdu(req);
40 }
41
42 #endif /* CONFIG_BLOCK */
43 #endif /* _SCSI_SCSI_TCQ_H */
44
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