| | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| | 2 | #ifndef INT_BLK_MQ_TAG_H |
| | 3 | #define INT_BLK_MQ_TAG_H |
| | 4 | |
| | 5 | #include "blk-mq.h" |
| | 6 | |
| | 7 | /* |
| | 8 | * Tag address space map. |
| | 9 | */ |
| | 10 | struct blk_mq_tags { |
| | 11 | unsigned int nr_tags; |
| | 12 | unsigned int nr_reserved_tags; |
| | 13 | |
| | 14 | atomic_t active_queues; |
| | 15 | |
| | 16 | struct sbitmap_queue bitmap_tags; |
| | 17 | struct sbitmap_queue breserved_tags; |
| | 18 | |
| | 19 | struct request **rqs; |
| | 20 | struct request **static_rqs; |
| | 21 | struct list_head page_list; |
| | 22 | }; |
| | 23 | |
| | 24 | |
| | 25 | extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy); |
| | 26 | extern void blk_mq_free_tags(struct blk_mq_tags *tags); |
| | 27 | |
| | 28 | extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |
| | 29 | extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_tags *tags, |
| | 30 | struct blk_mq_ctx *ctx, unsigned int tag); |
| | 31 | extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags); |
| | 32 | extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx, |
| | 33 | struct blk_mq_tags **tags, |
| | 34 | unsigned int depth, bool can_grow); |
| | 35 | extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool); |
| | 36 | void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, |
| | 37 | void *priv); |
| | 38 | |
| | 39 | static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt, |
| | 40 | struct blk_mq_hw_ctx *hctx) |
| | 41 | { |
| | 42 | if (!hctx) |
| | 43 | return &bt->ws[0]; |
| | 44 | return sbq_wait_ptr(bt, &hctx->wait_index); |
| | 45 | } |
| | 46 | |
| | 47 | enum { |
| | 48 | BLK_MQ_TAG_FAIL = -1U, |
| | 49 | BLK_MQ_TAG_MIN = 1, |
| | 50 | BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, |
| | 51 | }; |
| | 52 | |
| | 53 | extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *); |
| | 54 | extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *); |
| | 55 | |
| | 56 | static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) |
| | 57 | { |
| | 58 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) |
| | 59 | return false; |
| | 60 | |
| | 61 | return __blk_mq_tag_busy(hctx); |
| | 62 | } |
| | 63 | |
| | 64 | static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) |
| | 65 | { |
| | 66 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) |
| | 67 | return; |
| | 68 | |
| | 69 | __blk_mq_tag_idle(hctx); |
| | 70 | } |
| | 71 | |
| | 72 | /* |
| | 73 | * This helper should only be used for flush request to share tag |
| | 74 | * with the request cloned from, and both the two requests can't be |
| | 75 | * in flight at the same time. The caller has to make sure the tag |
| | 76 | * can't be freed. |
| | 77 | */ |
| | 78 | static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx, |
| | 79 | unsigned int tag, struct request *rq) |
| | 80 | { |
| | 81 | hctx->tags->rqs[tag] = rq; |
| | 82 | } |
| | 83 | |
| | 84 | static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags, |
| | 85 | unsigned int tag) |
| | 86 | { |
| | 87 | return tag < tags->nr_reserved_tags; |
| | 88 | } |
| | 89 | |
| | 90 | #endif |
projects / mirror_ubuntu-bionic-kernel.git / blame_incremental