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TOMOYO Linux Cross Reference
Linux/block/blk-mq-tag.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef INT_BLK_MQ_TAG_H
  3 #define INT_BLK_MQ_TAG_H
  4 
  5 struct blk_mq_alloc_data;
  6 
  7 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
  8                                         unsigned int reserved_tags,
  9                                         int node, int alloc_policy);
 10 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
 11 extern int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
 12                                struct sbitmap_queue *breserved_tags,
 13                                unsigned int queue_depth,
 14                                unsigned int reserved,
 15                                int node, int alloc_policy);
 16 
 17 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
 18 unsigned long blk_mq_get_tags(struct blk_mq_alloc_data *data, int nr_tags,
 19                               unsigned int *offset);
 20 extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
 21                            unsigned int tag);
 22 void blk_mq_put_tags(struct blk_mq_tags *tags, int *tag_array, int nr_tags);
 23 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
 24                                         struct blk_mq_tags **tags,
 25                                         unsigned int depth, bool can_grow);
 26 extern void blk_mq_tag_resize_shared_tags(struct blk_mq_tag_set *set,
 27                                              unsigned int size);
 28 extern void blk_mq_tag_update_sched_shared_tags(struct request_queue *q);
 29 
 30 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
 31 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_tag_iter_fn *fn,
 32                 void *priv);
 33 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
 34                 void *priv);
 35 
 36 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
 37                                                  struct blk_mq_hw_ctx *hctx)
 38 {
 39         if (!hctx)
 40                 return &bt->ws[0];
 41         return sbq_wait_ptr(bt, &hctx->wait_index);
 42 }
 43 
 44 enum {
 45         BLK_MQ_NO_TAG           = -1U,
 46         BLK_MQ_TAG_MIN          = 1,
 47         BLK_MQ_TAG_MAX          = BLK_MQ_NO_TAG - 1,
 48 };
 49 
 50 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
 51 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
 52 
 53 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
 54 {
 55         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
 56                 return false;
 57 
 58         return __blk_mq_tag_busy(hctx);
 59 }
 60 
 61 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
 62 {
 63         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
 64                 return;
 65 
 66         __blk_mq_tag_idle(hctx);
 67 }
 68 
 69 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
 70                                           unsigned int tag)
 71 {
 72         return tag < tags->nr_reserved_tags;
 73 }
 74 
 75 #endif
 76 

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