powerpc/mm/4k: don't allocate larger pmd page table for 4k
[linux/fpc-iii.git] / block / blk-mq-tag.h
blobd1662734dc539d866f9edcd48f155e2465f63942
1 #ifndef INT_BLK_MQ_TAG_H
2 #define INT_BLK_MQ_TAG_H
4 #include "blk-mq.h"
6 /*
7 * Tag address space map.
8 */
9 struct blk_mq_tags {
10 unsigned int nr_tags;
11 unsigned int nr_reserved_tags;
13 atomic_t active_queues;
15 struct sbitmap_queue bitmap_tags;
16 struct sbitmap_queue breserved_tags;
18 struct request **rqs;
19 struct list_head page_list;
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);
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);
36 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
37 struct blk_mq_hw_ctx *hctx)
39 if (!hctx)
40 return &bt->ws[0];
41 return sbq_wait_ptr(bt, &hctx->wait_index);
44 enum {
45 BLK_MQ_TAG_CACHE_MIN = 1,
46 BLK_MQ_TAG_CACHE_MAX = 64,
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,
55 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
56 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
58 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
60 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
61 return false;
63 return __blk_mq_tag_busy(hctx);
66 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
68 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
69 return;
71 __blk_mq_tag_idle(hctx);
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.
80 static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
81 unsigned int tag, struct request *rq)
83 hctx->tags->rqs[tag] = rq;
86 #endif