projects / linux.git / blame
| 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 |
| 19 | * generated by blk_mq_unique_tag(). | |
| f583f492 DS |
20 | **/ |
| 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 | } |
| 44 | ||
| 9361401e | 45 | #endif /* CONFIG_BLOCK */ |
| 1da177e4 | 46 | #endif /* _SCSI_SCSI_TCQ_H */ |