1 #ifndef INT_BLK_MQ_TAG_H
2 #define INT_BLK_MQ_TAG_H
11 wait_queue_head_t wait;
12 } ____cacheline_aligned_in_smp;
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))
17 struct blk_mq_bitmap {
20 } ____cacheline_aligned_in_smp;
22 struct blk_mq_bitmap_tags {
24 unsigned int wake_cnt;
25 unsigned int bits_per_word;
28 struct blk_mq_bitmap *map;
30 unsigned int wake_index;
31 struct bt_wait_state *bs;
35 * Tag address space map.
39 unsigned int nr_reserved_tags;
41 struct blk_mq_bitmap_tags bitmap_tags;
42 struct blk_mq_bitmap_tags breserved_tags;
45 struct list_head page_list;
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);
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);
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);
58 extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
61 BLK_MQ_TAG_CACHE_MIN = 1,
62 BLK_MQ_TAG_CACHE_MAX = 64,
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,