projects / deliverable / 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 |
| d285203c | 13 | static inline struct scsi_cmnd *scsi_mq_find_tag(struct Scsi_Host *shost, |
| 1ee8e889 | 14 | int unique_tag) |
| d285203c | 15 | { |
| 1ee8e889 BVA |
16 | u16 hwq = blk_mq_unique_tag_to_hwq(unique_tag); |
| 17 | struct request *req = NULL; | |
| d285203c | 18 | |
| 1ee8e889 BVA |
19 | if (hwq < shost->tag_set.nr_hw_queues) |
| 20 | req = blk_mq_tag_to_rq(shost->tag_set.tags[hwq], | |
| 21 | blk_mq_unique_tag_to_tag(unique_tag)); | |
| d285203c CH |
22 | return req ? (struct scsi_cmnd *)req->special : NULL; |
| 23 | } | |
| 24 | ||
| 1da177e4 LT |
25 | /** |
| 26 | * scsi_find_tag - find a tagged command by device | |
| 27 | * @SDpnt: pointer to the ScSI device | |
| 1ee8e889 | 28 | * @tag: tag generated by blk_mq_unique_tag() |
| 1da177e4 LT |
29 | * |
| 30 | * Notes: | |
| 31 | * Only works with tags allocated by the generic blk layer. | |
| 32 | **/ | |
| 33 | static inline struct scsi_cmnd *scsi_find_tag(struct scsi_device *sdev, int tag) | |
| 34 | { | |
| 1da177e4 LT |
35 | struct request *req; |
| 36 | ||
| 37 | if (tag != SCSI_NO_TAG) { | |
| d285203c | 38 | if (shost_use_blk_mq(sdev->host)) |
| 1ee8e889 | 39 | return scsi_mq_find_tag(sdev->host, tag); |
| d285203c | 40 | |
| 1ee8e889 | 41 | req = blk_queue_find_tag(sdev->request_queue, tag); |
| 1da177e4 LT |
42 | return req ? (struct scsi_cmnd *)req->special : NULL; |
| 43 | } | |
| 44 | ||
| 45 | /* single command, look in space */ | |
| 46 | return sdev->current_cmnd; | |
| 47 | } | |
| 48 | ||
| d285203c | 49 | |
| 86e33a29 JB |
50 | /** |
| 51 | * scsi_init_shared_tag_map - create a shared tag map | |
| 52 | * @shost: the host to share the tag map among all devices | |
| 53 | * @depth: the total depth of the map | |
| 54 | */ | |
| deb81d80 | 55 | static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth) |
| 86e33a29 | 56 | { |
| d285203c CH |
57 | /* |
| 58 | * We always have a shared tag map around when using blk-mq. | |
| 59 | */ | |
| 60 | if (shost_use_blk_mq(shost)) | |
| 61 | return 0; | |
| 62 | ||
| 3070f69b JA |
63 | /* |
| 64 | * If the shared tag map isn't already initialized, do it now. | |
| 65 | * This saves callers from having to check ->bqt when setting up | |
| 66 | * devices on the shared host (for libata) | |
| 67 | */ | |
| 68 | if (!shost->bqt) { | |
| 69 | shost->bqt = blk_init_tags(depth); | |
| 70 | if (!shost->bqt) | |
| 71 | return -ENOMEM; | |
| 72 | } | |
| 73 | ||
| 74 | return 0; | |
| 86e33a29 JB |
75 | } |
| 76 | ||
| f583f492 DS |
77 | /** |
| 78 | * scsi_host_find_tag - find the tagged command by host | |
| 79 | * @shost: pointer to scsi_host | |
| 1ee8e889 | 80 | * @tag: tag generated by blk_mq_unique_tag() |
| f583f492 DS |
81 | * |
| 82 | * Notes: | |
| 83 | * Only works with tags allocated by the generic blk layer. | |
| 84 | **/ | |
| 85 | static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost, | |
| 86 | int tag) | |
| 87 | { | |
| 88 | struct request *req; | |
| 89 | ||
| 90 | if (tag != SCSI_NO_TAG) { | |
| d285203c | 91 | if (shost_use_blk_mq(shost)) |
| 1ee8e889 | 92 | return scsi_mq_find_tag(shost, tag); |
| f583f492 DS |
93 | req = blk_map_queue_find_tag(shost->bqt, tag); |
| 94 | return req ? (struct scsi_cmnd *)req->special : NULL; | |
| 95 | } | |
| 96 | return NULL; | |
| 97 | } | |
| 98 | ||
| 9361401e | 99 | #endif /* CONFIG_BLOCK */ |
| 1da177e4 | 100 | #endif /* _SCSI_SCSI_TCQ_H */ |