/* SPDX-License-Identifier: GPL-2.0 */

  #ifndef INT_BLK_MQ_TAG_H
  #define INT_BLK_MQ_TAG_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 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, unsigned int flags);
  extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);

  extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set,
  				      unsigned int flags);
  extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);

  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_resize_shared_sbitmap(struct blk_mq_tag_set *set,
  					     unsigned int size);

  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_QUEUE_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_QUEUE_SHARED))

  		return;
  
  	__blk_mq_tag_idle(hctx);
  }

  static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
  					  unsigned int tag)
  {
  	return tag < tags->nr_reserved_tags;
  }

  #endif