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gerrit-public.fairphone.software / kernel / msm-4.9 / 98d95416dbfaf4910caadfb4ddc75e4aacbdff8c / . / block / blk-mq-tag.h
blob: 09f4cc0aaa84c9d7e83da2c86277c09693f07afe [file] [log] [blame]
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]1#ifndef INT_BLK_MQ_TAG_H
2#define INT_BLK_MQ_TAG_H
3
Jens Axboee93ecf62014-05-19 09:17:48 -0600[diff] [blame]4#include "blk-mq.h"
5
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]6/*
7 * Tag address space map.
8 */
9struct blk_mq_tags {
10 unsigned int nr_tags;
11 unsigned int nr_reserved_tags;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]12
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]13 atomic_t active_queues;
14
Omar Sandoval88459642016-09-17 08:38:44 -0600[diff] [blame]15 struct sbitmap_queue bitmap_tags;
16 struct sbitmap_queue breserved_tags;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]17
18 struct request **rqs;
19 struct list_head page_list;
Shaohua Li24391c02015-01-23 14:18:00 -0700[diff] [blame]20
Keith Buschf26cdc82015-06-01 09:29:53 -0600[diff] [blame]21 cpumask_var_t cpumask;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]22};
23
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]24
Shaohua Li24391c02015-01-23 14:18:00 -0700[diff] [blame]25extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]26extern void blk_mq_free_tags(struct blk_mq_tags *tags);
27
Ming Leicb96a422014-06-01 00:43:37 +0800[diff] [blame]28extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
Omar Sandoval40aabb62016-09-17 01:28:23 -0700[diff] [blame]29extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
30 unsigned int tag);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]31extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
32extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
Jens Axboee3a2b3f2014-05-20 11:49:02 -0600[diff] [blame]33extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
Jens Axboeaed3ea92014-12-22 14:04:42 -0700[diff] [blame]34extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
Christoph Hellwig0bf6cd52015-09-27 21:01:51 +0200[diff] [blame]35void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
36 void *priv);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]37
Omar Sandoval88459642016-09-17 08:38:44 -0600[diff] [blame]38static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
39 struct blk_mq_hw_ctx *hctx)
40{
41 if (!hctx)
42 return &bt->ws[0];
43 return sbq_wait_ptr(bt, &hctx->wait_index);
44}
45
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]46enum {
47 BLK_MQ_TAG_CACHE_MIN = 1,
48 BLK_MQ_TAG_CACHE_MAX = 64,
49};
50
51enum {
52 BLK_MQ_TAG_FAIL = -1U,
53 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
54 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
55};
56
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]57extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
58extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
59
60static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
61{
62 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
63 return false;
64
65 return __blk_mq_tag_busy(hctx);
66}
67
68static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
69{
70 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
71 return;
72
73 __blk_mq_tag_idle(hctx);
74}
75
Ming Lei0048b482015-08-09 03:41:51 -0400[diff] [blame]76/*
77 * This helper should only be used for flush request to share tag
78 * with the request cloned from, and both the two requests can't be
79 * in flight at the same time. The caller has to make sure the tag
80 * can't be freed.
81 */
82static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
83 unsigned int tag, struct request *rq)
84{
85 hctx->tags->rqs[tag] = rq;
86}
87
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]88#endif