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(unique_tag: tag); |
32 | if (hwq < shost->tag_set.nr_hw_queues) { |
33 | req = blk_mq_tag_to_rq(tags: shost->tag_set.tags[hwq], |
34 | tag: blk_mq_unique_tag_to_tag(unique_tag: tag)); |
35 | } |
36 | |
37 | if (!req || !blk_mq_request_started(rq: req)) |
38 | return NULL; |
39 | return blk_mq_rq_to_pdu(rq: req); |
40 | } |
41 | |
42 | #endif /* CONFIG_BLOCK */ |
43 | #endif /* _SCSI_SCSI_TCQ_H */ |
44 |