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 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 void __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 void blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
  54 {
  55         if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
  56                 __blk_mq_tag_busy(hctx);
  57 }
  58
  59 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
  60 {
  61         if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
  62                 return;
  63
  64         __blk_mq_tag_idle(hctx);
  65 }
  66
  67 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
  68                                           unsigned int tag)
  69 {
  70         return tag < tags->nr_reserved_tags;
  71 }
  72
  73 #endif