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 extern int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
  36                                struct sbitmap_queue *breserved_tags,
  37                                unsigned int queue_depth,
  38                                unsigned int reserved,
  39                                int node, int alloc_policy);
  40
  41 extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set);
  42 extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
  43 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
  44 extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
  45                            unsigned int tag);
  46 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
  47                                         struct blk_mq_tags **tags,
  48                                         unsigned int depth, bool can_grow);
  49 extern void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set,
  50                                              unsigned int size);
  51
  52 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
  53 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
  54                 void *priv);
  55 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
  56                 void *priv);
  57
  58 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
  59                                                  struct blk_mq_hw_ctx *hctx)
  60 {
  61         if (!hctx)
  62                 return &bt->ws[0];
  63         return sbq_wait_ptr(bt, &hctx->wait_index);
  64 }
  65
  66 enum {
  67         BLK_MQ_NO_TAG           = -1U,
  68         BLK_MQ_TAG_MIN          = 1,
  69         BLK_MQ_TAG_MAX          = BLK_MQ_NO_TAG - 1,
  70 };
  71
  72 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
  73 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
  74
  75 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
  76 {
  77         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
  78                 return false;
  79
  80         return __blk_mq_tag_busy(hctx);
  81 }
  82
  83 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
  84 {
  85         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
  86                 return;
  87
  88         __blk_mq_tag_idle(hctx);
  89 }
  90
  91 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
  92                                           unsigned int tag)
  93 {
  94         return tag < tags->nr_reserved_tags;
  95 }
  96
  97 #endif