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;
28 struct bt_wait_state *bs;
32 * Tag address space map.
36 unsigned int nr_reserved_tags;
38 atomic_t active_queues;
40 struct blk_mq_bitmap_tags bitmap_tags;
41 struct blk_mq_bitmap_tags breserved_tags;
44 struct list_head page_list;
50 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
51 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
53 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
54 extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
55 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
56 extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
57 extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
58 extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
59 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
60 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
64 BLK_MQ_TAG_CACHE_MIN = 1,
65 BLK_MQ_TAG_CACHE_MAX = 64,
69 BLK_MQ_TAG_FAIL = -1U,
70 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
71 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
74 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
75 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
77 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
79 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
82 return __blk_mq_tag_busy(hctx);
85 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
87 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
90 __blk_mq_tag_idle(hctx);
94 * This helper should only be used for flush request to share tag
95 * with the request cloned from, and both the two requests can't be
96 * in flight at the same time. The caller has to make sure the tag
99 static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
100 unsigned int tag, struct request *rq)
102 hctx->tags->rqs[tag] = rq;