1 #ifndef INT_BLK_MQ_TAG_H
2 #define INT_BLK_MQ_TAG_H
11 struct bt_wait_state {
13 wait_queue_head_t wait;
14 } ____cacheline_aligned_in_smp;
16 #define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word)
17 #define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1))
19 struct blk_mq_bitmap_tags {
21 unsigned int wake_cnt;
22 unsigned int bits_per_word;
25 struct blk_align_bitmap *map;
27 unsigned int wake_index;
28 struct bt_wait_state *bs;
32 * Tag address space map.
36 unsigned int nr_reserved_tags;
38 struct blk_mq_bitmap_tags bitmap_tags;
39 struct blk_mq_bitmap_tags breserved_tags;
42 struct list_head page_list;
46 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
47 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
49 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);
50 extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, bool reserved);
51 extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag, unsigned int *last_tag);
52 extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
53 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
54 extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
55 extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
58 BLK_MQ_TAG_CACHE_MIN = 1,
59 BLK_MQ_TAG_CACHE_MAX = 64,
63 BLK_MQ_TAG_FAIL = -1U,
64 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
65 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,