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gerrit-public.fairphone.software / kernel / msm-4.9 / 24391c0dc57c3756a219defaa781e68637d6ab7d / . / block / blk-mq-tag.h
blob: 90767b370308daab9bdd7efe3903dd72af2a6dad [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
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]6enum {
7 BT_WAIT_QUEUES = 8,
8 BT_WAIT_BATCH = 8,
9};
10
11struct bt_wait_state {
12 atomic_t wait_cnt;
13 wait_queue_head_t wait;
14} ____cacheline_aligned_in_smp;
15
Jens Axboe59d13bf2014-05-09 13:41:15 -0600[diff] [blame]16#define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word)
17#define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1))
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]18
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]19struct blk_mq_bitmap_tags {
20 unsigned int depth;
21 unsigned int wake_cnt;
Jens Axboe59d13bf2014-05-09 13:41:15 -0600[diff] [blame]22 unsigned int bits_per_word;
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]23
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]24 unsigned int map_nr;
Jens Axboee93ecf62014-05-19 09:17:48 -0600[diff] [blame]25 struct blk_align_bitmap *map;
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]26
Alexander Gordeev8537b122014-06-17 22:12:35 -0700[diff] [blame]27 atomic_t wake_index;
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]28 struct bt_wait_state *bs;
29};
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]30
31/*
32 * Tag address space map.
33 */
34struct blk_mq_tags {
35 unsigned int nr_tags;
36 unsigned int nr_reserved_tags;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]37
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]38 atomic_t active_queues;
39
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]40 struct blk_mq_bitmap_tags bitmap_tags;
41 struct blk_mq_bitmap_tags breserved_tags;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]42
43 struct request **rqs;
44 struct list_head page_list;
Shaohua Li24391c02015-01-23 14:18:00 -0700[diff] [blame^]45
46 int alloc_policy;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]47};
48
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]49
Shaohua Li24391c02015-01-23 14:18:00 -0700[diff] [blame^]50extern 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]51extern void blk_mq_free_tags(struct blk_mq_tags *tags);
52
Ming Leicb96a422014-06-01 00:43:37 +0800[diff] [blame]53extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]54extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]55extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
56extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]57extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
Jens Axboee3a2b3f2014-05-20 11:49:02 -0600[diff] [blame]58extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
Jens Axboeaed3ea92014-12-22 14:04:42 -0700[diff] [blame]59extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]60
61enum {
62 BLK_MQ_TAG_CACHE_MIN = 1,
63 BLK_MQ_TAG_CACHE_MAX = 64,
64};
65
66enum {
67 BLK_MQ_TAG_FAIL = -1U,
68 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
69 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
70};
71
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]72extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
73extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
74
75static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
76{
77 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
78 return false;
79
80 return __blk_mq_tag_busy(hctx);
81}
82
83static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
84{
85 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
86 return;
87
88 __blk_mq_tag_idle(hctx);
89}
90
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]91#endif