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Linux/block/blk-mq-tag.h

  1 #ifndef INT_BLK_MQ_TAG_H
  2 #define INT_BLK_MQ_TAG_H
  3 
  4 #include "blk-mq.h"
  5 
  6 /*
  7  * Tag address space map.
  8  */
  9 struct blk_mq_tags {
 10         unsigned int nr_tags;
 11         unsigned int nr_reserved_tags;
 12 
 13         atomic_t active_queues;
 14 
 15         struct sbitmap_queue bitmap_tags;
 16         struct sbitmap_queue breserved_tags;
 17 
 18         struct request **rqs;
 19         struct list_head page_list;
 20 };
 21 
 22 
 23 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
 24 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
 25 
 26 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
 27 extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
 28                            unsigned int tag);
 29 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
 30 extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
 31 extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
 32 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
 33 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_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_TAG_CACHE_MIN    = 1,
 46         BLK_MQ_TAG_CACHE_MAX    = 64,
 47 };
 48 
 49 enum {
 50         BLK_MQ_TAG_FAIL         = -1U,
 51         BLK_MQ_TAG_MIN          = BLK_MQ_TAG_CACHE_MIN,
 52         BLK_MQ_TAG_MAX          = BLK_MQ_TAG_FAIL - 1,
 53 };
 54 
 55 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
 56 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
 57 
 58 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
 59 {
 60         if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
 61                 return false;
 62 
 63         return __blk_mq_tag_busy(hctx);
 64 }
 65 
 66 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
 67 {
 68         if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
 69                 return;
 70 
 71         __blk_mq_tag_idle(hctx);
 72 }
 73 
 74 /*
 75  * This helper should only be used for flush request to share tag
 76  * with the request cloned from, and both the two requests can't be
 77  * in flight at the same time. The caller has to make sure the tag
 78  * can't be freed.
 79  */
 80 static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
 81                 unsigned int tag, struct request *rq)
 82 {
 83         hctx->tags->rqs[tag] = rq;
 84 }
 85 
 86 #endif
 87 

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