Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1 | #ifndef INT_BLK_MQ_TAG_H |
| 2 | #define INT_BLK_MQ_TAG_H |
| 3 | |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 4 | enum { |
| 5 | BT_WAIT_QUEUES = 8, |
| 6 | BT_WAIT_BATCH = 8, |
| 7 | }; |
| 8 | |
| 9 | struct bt_wait_state { |
| 10 | atomic_t wait_cnt; |
| 11 | wait_queue_head_t wait; |
| 12 | } ____cacheline_aligned_in_smp; |
| 13 | |
Jens Axboe | 59d13bf | 2014-05-09 13:41:15 -0600 | [diff] [blame^] | 14 | #define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word) |
| 15 | #define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1)) |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 16 | |
| 17 | struct blk_mq_bitmap { |
| 18 | unsigned long word; |
| 19 | unsigned long depth; |
| 20 | } ____cacheline_aligned_in_smp; |
| 21 | |
| 22 | struct blk_mq_bitmap_tags { |
| 23 | unsigned int depth; |
| 24 | unsigned int wake_cnt; |
Jens Axboe | 59d13bf | 2014-05-09 13:41:15 -0600 | [diff] [blame^] | 25 | unsigned int bits_per_word; |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 26 | |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 27 | unsigned int map_nr; |
Jens Axboe | 59d13bf | 2014-05-09 13:41:15 -0600 | [diff] [blame^] | 28 | struct blk_mq_bitmap *map; |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 29 | |
| 30 | unsigned int wake_index; |
| 31 | struct bt_wait_state *bs; |
| 32 | }; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 33 | |
| 34 | /* |
| 35 | * Tag address space map. |
| 36 | */ |
| 37 | struct blk_mq_tags { |
| 38 | unsigned int nr_tags; |
| 39 | unsigned int nr_reserved_tags; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 40 | |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 41 | struct blk_mq_bitmap_tags bitmap_tags; |
| 42 | struct blk_mq_bitmap_tags breserved_tags; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 43 | |
| 44 | struct request **rqs; |
| 45 | struct list_head page_list; |
| 46 | }; |
| 47 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 48 | |
| 49 | extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node); |
| 50 | extern void blk_mq_free_tags(struct blk_mq_tags *tags); |
| 51 | |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 52 | extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, unsigned int *last_tag, gfp_t gfp, bool reserved); |
| 53 | extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, bool reserved); |
| 54 | extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag, unsigned int *last_tag); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 55 | extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data); |
| 56 | extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags); |
| 57 | extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page); |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 58 | extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 59 | |
| 60 | enum { |
| 61 | BLK_MQ_TAG_CACHE_MIN = 1, |
| 62 | BLK_MQ_TAG_CACHE_MAX = 64, |
| 63 | }; |
| 64 | |
| 65 | enum { |
| 66 | BLK_MQ_TAG_FAIL = -1U, |
| 67 | BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN, |
| 68 | BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, |
| 69 | }; |
| 70 | |
| 71 | #endif |