| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef INT_BLK_MQ_TAG_H |
| #define INT_BLK_MQ_TAG_H |
| |
| #include "blk-mq.h" |
| |
| /* |
| * Tag address space map. |
| */ |
| struct blk_mq_tags { |
| unsigned int nr_tags; |
| unsigned int nr_reserved_tags; |
| |
| atomic_t active_queues; |
| |
| struct sbitmap_queue bitmap_tags; |
| struct sbitmap_queue breserved_tags; |
| |
| struct request **rqs; |
| struct request **static_rqs; |
| struct list_head page_list; |
| }; |
| |
| |
| extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy); |
| extern void blk_mq_free_tags(struct blk_mq_tags *tags); |
| |
| extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |
| extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx, |
| unsigned int tag); |
| extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx, |
| struct blk_mq_tags **tags, |
| unsigned int depth, bool can_grow); |
| extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool); |
| void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, |
| void *priv); |
| void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn, |
| void *priv); |
| |
| static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt, |
| struct blk_mq_hw_ctx *hctx) |
| { |
| if (!hctx) |
| return &bt->ws[0]; |
| return sbq_wait_ptr(bt, &hctx->wait_index); |
| } |
| |
| enum { |
| BLK_MQ_NO_TAG = -1U, |
| BLK_MQ_TAG_MIN = 1, |
| BLK_MQ_TAG_MAX = BLK_MQ_NO_TAG - 1, |
| }; |
| |
| extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *); |
| extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *); |
| |
| static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) |
| { |
| if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) |
| return false; |
| |
| return __blk_mq_tag_busy(hctx); |
| } |
| |
| static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) |
| { |
| if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) |
| return; |
| |
| __blk_mq_tag_idle(hctx); |
| } |
| |
| /* |
| * This helper should only be used for flush request to share tag |
| * with the request cloned from, and both the two requests can't be |
| * in flight at the same time. The caller has to make sure the tag |
| * can't be freed. |
| */ |
| static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx, |
| unsigned int tag, struct request *rq) |
| { |
| hctx->tags->rqs[tag] = rq; |
| } |
| |
| static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags, |
| unsigned int tag) |
| { |
| return tag < tags->nr_reserved_tags; |
| } |
| |
| #endif |