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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
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> | |
86e33a29 | 8 | #include <scsi/scsi_host.h> |
1da177e4 | 9 | |
1da177e4 LT |
10 | #define SCSI_NO_TAG (-1) /* identify no tag in use */ |
11 | ||
12 | ||
9361401e | 13 | #ifdef CONFIG_BLOCK |
f583f492 DS |
14 | /** |
15 | * scsi_host_find_tag - find the tagged command by host | |
16 | * @shost: pointer to scsi_host | |
64d513ac | 17 | * @tag: tag |
f583f492 | 18 | * |
64d513ac CH |
19 | * Note: for devices using multiple hardware queues tag must have been |
20 | * generated by blk_mq_unique_tag(). | |
f583f492 DS |
21 | **/ |
22 | static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, | |
64d513ac | 23 | int tag) |
f583f492 | 24 | { |
64d513ac | 25 | struct request *req = NULL; |
f664a3cc | 26 | u16 hwq; |
f583f492 | 27 | |
64d513ac CH |
28 | if (tag == SCSI_NO_TAG) |
29 | return NULL; | |
30 | ||
f664a3cc JA |
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)); | |
f583f492 | 35 | } |
64d513ac CH |
36 | |
37 | if (!req) | |
38 | return NULL; | |
bed2213d | 39 | return blk_mq_rq_to_pdu(req); |
f583f492 DS |
40 | } |
41 | ||
9361401e | 42 | #endif /* CONFIG_BLOCK */ |
1da177e4 | 43 | #endif /* _SCSI_SCSI_TCQ_H */ |