the-tree/block/blk-mq-tag.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef INT_BLK_MQ_TAG_H
0003 #define INT_BLK_MQ_TAG_H
0004
0005 struct blk_mq_alloc_data;
0006
0007 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
0008                     unsigned int reserved_tags,
0009                     int node, int alloc_policy);
0010 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
0011 extern int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
0012                    struct sbitmap_queue *breserved_tags,
0013                    unsigned int queue_depth,
0014                    unsigned int reserved,
0015                    int node, int alloc_policy);
0016
0017 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
0018 unsigned long blk_mq_get_tags(struct blk_mq_alloc_data *data, int nr_tags,
0019                   unsigned int *offset);
0020 extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
0021                unsigned int tag);
0022 void blk_mq_put_tags(struct blk_mq_tags *tags, int *tag_array, int nr_tags);
0023 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
0024                     struct blk_mq_tags **tags,
0025                     unsigned int depth, bool can_grow);
0026 extern void blk_mq_tag_resize_shared_tags(struct blk_mq_tag_set *set,
0027                          unsigned int size);
0028 extern void blk_mq_tag_update_sched_shared_tags(struct request_queue *q);
0029
0030 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
0031 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_tag_iter_fn *fn,
0032         void *priv);
0033 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
0034         void *priv);
0035
0036 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
0037                          struct blk_mq_hw_ctx *hctx)
0038 {
0039     if (!hctx)
0040         return &bt->ws[0];
0041     return sbq_wait_ptr(bt, &hctx->wait_index);
0042 }
0043
0044 enum {
0045     BLK_MQ_NO_TAG       = -1U,
0046     BLK_MQ_TAG_MIN      = 1,
0047     BLK_MQ_TAG_MAX      = BLK_MQ_NO_TAG - 1,
0048 };
0049
0050 extern void __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
0051 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
0052
0053 static inline void blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
0054 {
0055     if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
0056         __blk_mq_tag_busy(hctx);
0057 }
0058
0059 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
0060 {
0061     if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
0062         return;
0063
0064     __blk_mq_tag_idle(hctx);
0065 }
0066
0067 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
0068                       unsigned int tag)
0069 {
0070     return tag < tags->nr_reserved_tags;
0071 }
0072
0073 #endif