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          * used to clear request reference in rqs[] before freeing one
  26          * request pool
  27          */
  28         spinlock_t lock;
  29 };
  30
  31 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
  32                                         unsigned int reserved_tags,
  33                                         int node, unsigned int flags);
  34 extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);
  35
  36 extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set,
  37                                       unsigned int flags);
  38 extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
  39
  40 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
  41 extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
  42                            unsigned int tag);
  43 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
  44                                         struct blk_mq_tags **tags,
  45                                         unsigned int depth, bool can_grow);
  46 extern void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set,
  47                                              unsigned int size);
  48
  49 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
  50 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
  51                 void *priv);
  52 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
  53                 void *priv);
  54
  55 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
  56                                                  struct blk_mq_hw_ctx *hctx)
  57 {
  58         if (!hctx)
  59                 return &bt->ws[0];
  60         return sbq_wait_ptr(bt, &hctx->wait_index);
  61 }
  62
  63 enum {
  64         BLK_MQ_NO_TAG           = -1U,
  65         BLK_MQ_TAG_MIN          = 1,
  66         BLK_MQ_TAG_MAX          = BLK_MQ_NO_TAG - 1,
  67 };
  68
  69 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
  70 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
  71
  72 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
  73 {
  74         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
  75                 return false;
  76
  77         return __blk_mq_tag_busy(hctx);
  78 }
  79
  80 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
  81 {
  82         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
  83                 return;
  84
  85         __blk_mq_tag_idle(hctx);
  86 }
  87
  88 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
  89                                           unsigned int tag)
  90 {
  91         return tag < tags->nr_reserved_tags;
  92 }
  93
  94 #endif