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gerrit-public.fairphone.software / kernel / msm-4.9 / 2d4df13c0f9ef56452b1d9a9016cb3946e17bfe5 / . / block / blk-mq-tag.h
blob: 9eb2cf4f01cb874706d64af87a01e94e0121f7e4 [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;
Keith Buschf26cdc82015-06-01 09:29:53 -0600[diff] [blame]47 cpumask_var_t cpumask;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]48};
49
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]50
Shaohua Li24391c02015-01-23 14:18:00 -0700[diff] [blame]51extern 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]52extern void blk_mq_free_tags(struct blk_mq_tags *tags);
53
Ming Leicb96a422014-06-01 00:43:37 +0800[diff] [blame]54extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]55extern 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]56extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
57extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]58extern 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]59extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
Jens Axboeaed3ea92014-12-22 14:04:42 -0700[diff] [blame]60extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]61
62enum {
63 BLK_MQ_TAG_CACHE_MIN = 1,
64 BLK_MQ_TAG_CACHE_MAX = 64,
65};
66
67enum {
68 BLK_MQ_TAG_FAIL = -1U,
69 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
70 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
71};
72
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]73extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
74extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
75
76static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
77{
78 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
79 return false;
80
81 return __blk_mq_tag_busy(hctx);
82}
83
84static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
85{
86 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
87 return;
88
89 __blk_mq_tag_idle(hctx);
90}
91
Ming Lei0048b482015-08-09 03:41:51 -0400[diff] [blame]92/*
93 * This helper should only be used for flush request to share tag
94 * with the request cloned from, and both the two requests can't be
95 * in flight at the same time. The caller has to make sure the tag
96 * can't be freed.
97 */
98static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
99 unsigned int tag, struct request *rq)
100{
101 hctx->tags->rqs[tag] = rq;
102}
103
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]104#endif