block/blk-mq-tag.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef INT_BLK_MQ_TAG_H
   3 #define INT_BLK_MQ_TAG_H
   4
   5 /*
   6  * Tag address space map.
   7  */
   8 struct blk_mq_tags {
   9         unsigned int nr_tags;
  10         unsigned int nr_reserved_tags;
  11
  12         atomic_t active_queues;
  13
  14         struct sbitmap_queue *bitmap_tags;
  15         struct sbitmap_queue *breserved_tags;
  16
  17         struct sbitmap_queue __bitmap_tags;
  18         struct sbitmap_queue __breserved_tags;
  19
  20         struct request **rqs;
  21         struct request **static_rqs;
  22         struct list_head page_list;
  23 };
  24
  25 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
  26                                         unsigned int reserved_tags,
  27                                         int node, unsigned int flags);
  28 extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);
  29
  30 extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set,
  31                                       unsigned int flags);
  32 extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
  33
  34 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
  35 extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
  36                            unsigned int tag);
  37 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
  38                                         struct blk_mq_tags **tags,
  39                                         unsigned int depth, bool can_grow);
  40 extern void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set,
  41                                              unsigned int size);
  42
  43 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
  44 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
  45                 void *priv);
  46 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
  47                 void *priv);
  48
  49 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
  50                                                  struct blk_mq_hw_ctx *hctx)
  51 {
  52         if (!hctx)
  53                 return &bt->ws[0];
  54         return sbq_wait_ptr(bt, &hctx->wait_index);
  55 }
  56
  57 enum {
  58         BLK_MQ_NO_TAG           = -1U,
  59         BLK_MQ_TAG_MIN          = 1,
  60         BLK_MQ_TAG_MAX          = BLK_MQ_NO_TAG - 1,
  61 };
  62
  63 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
  64 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
  65
  66 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
  67 {
  68         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
  69                 return false;
  70
  71         return __blk_mq_tag_busy(hctx);
  72 }
  73
  74 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
  75 {
  76         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
  77                 return;
  78
  79         __blk_mq_tag_idle(hctx);
  80 }
  81
  82 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
  83                                           unsigned int tag)
  84 {
  85         return tag < tags->nr_reserved_tags;
  86 }
  87
  88 #endif