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review.shift-gmbh.com / SHIFTPHONES / kernel / common / 0fbad7c8e2def6a1aa84c3efff23f79539ba530a / . / block / blk-mq.h
blob: cc67b48e3551d3d1b0fd02c083694a8856285f38 [file] [log] [blame]
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]1#ifndef INT_BLK_MQ_H
2#define INT_BLK_MQ_H
3
Jens Axboecf43e6b2016-11-07 21:32:37 -0700[diff] [blame]4#include "blk-stat.h"
5
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]6struct blk_mq_tag_set;
7
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]8struct blk_mq_ctx {
9 struct {
10 spinlock_t lock;
11 struct list_head rq_list;
12 } ____cacheline_aligned_in_smp;
13
14 unsigned int cpu;
15 unsigned int index_hw;
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]16
17 /* incremented at dispatch time */
18 unsigned long rq_dispatched[2];
19 unsigned long rq_merged;
20
21 /* incremented at completion time */
22 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
23
24 struct request_queue *queue;
25 struct kobject kobj;
Jens Axboe4bb659b2014-05-09 09:36:49 -0600[diff] [blame]26} ____cacheline_aligned_in_smp;
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]27
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]28void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
Tejun Heo780db202014-07-01 10:31:13 -0600[diff] [blame]29void blk_mq_freeze_queue(struct request_queue *q);
Ming Lei3edcc0c2013-12-26 21:31:38 +0800[diff] [blame]30void blk_mq_free_queue(struct request_queue *q);
Jens Axboee3a2b3f2014-05-20 11:49:02 -0600[diff] [blame]31int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
Jens Axboeaed3ea92014-12-22 14:04:42 -0700[diff] [blame]32void blk_mq_wake_waiters(struct request_queue *q);
Omar Sandoval81380ca2017-04-07 08:56:26 -0600[diff] [blame]33bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *);
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]34void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
Jens Axboe50e1dab2017-01-26 14:42:34 -0700[diff] [blame]35bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx);
Jens Axboebd6737f2017-01-27 01:00:47 -0700[diff] [blame]36bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
37 bool wait);
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]38
39/*
40 * Internal helpers for allocating/freeing the request map
41 */
Jens Axboecc71a6f2017-01-11 14:29:56 -0700[diff] [blame]42void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
43 unsigned int hctx_idx);
44void blk_mq_free_rq_map(struct blk_mq_tags *tags);
45struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,
46 unsigned int hctx_idx,
47 unsigned int nr_tags,
48 unsigned int reserved_tags);
49int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
50 unsigned int hctx_idx, unsigned int depth);
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]51
52/*
53 * Internal helpers for request insertion into sw queues
54 */
55void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
56 bool at_head);
Jens Axboebd166ef2017-01-17 06:03:22 -0700[diff] [blame]57void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
58 struct list_head *list);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]59/*
60 * CPU hotplug helpers
61 */
Jens Axboe676141e2014-03-20 13:29:18 -0600[diff] [blame]62void blk_mq_enable_hotplug(void);
63void blk_mq_disable_hotplug(void);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]64
65/*
66 * CPU -> queue mappings
67 */
Jens Axboef14bbe72014-05-27 12:06:53 -0600[diff] [blame]68extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]69
Christoph Hellwig7d7e0f92016-09-14 16:18:54 +0200[diff] [blame]70static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
71 int cpu)
72{
73 return q->queue_hw_ctx[q->mq_map[cpu]];
74}
75
Jens Axboee93ecf62014-05-19 09:17:48 -0600[diff] [blame]76/*
Jens Axboe67aec142014-05-30 08:25:36 -0600[diff] [blame]77 * sysfs helpers
78 */
Ming Lei737f98c2017-02-22 18:13:59 +0800[diff] [blame]79extern void blk_mq_sysfs_init(struct request_queue *q);
Ming Lei7ea5fe32017-02-22 18:14:00 +0800[diff] [blame]80extern void blk_mq_sysfs_deinit(struct request_queue *q);
Bart Van Assche2d0364c2017-04-26 13:47:48 -0700[diff] [blame]81extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
Jens Axboe67aec142014-05-30 08:25:36 -0600[diff] [blame]82extern int blk_mq_sysfs_register(struct request_queue *q);
83extern void blk_mq_sysfs_unregister(struct request_queue *q);
Keith Busch868f2f02015-12-17 17:08:14 -0700[diff] [blame]84extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
Jens Axboe67aec142014-05-30 08:25:36 -0600[diff] [blame]85
Christoph Hellwig90415832014-09-22 10:21:48 -0600[diff] [blame]86extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
87
Ming Leie09aae72015-01-29 20:17:27 +0800[diff] [blame]88void blk_mq_release(struct request_queue *q);
89
Ming Lei1aecfe42014-06-01 00:43:36 +0800[diff] [blame]90static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
91 unsigned int cpu)
92{
93 return per_cpu_ptr(q->queue_ctx, cpu);
94}
95
96/*
97 * This assumes per-cpu software queueing queues. They could be per-node
98 * as well, for instance. For now this is hardcoded as-is. Note that we don't
99 * care about preemption, since we know the ctx's are persistent. This does
100 * mean that we can't rely on ctx always matching the currently running CPU.
101 */
102static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
103{
104 return __blk_mq_get_ctx(q, get_cpu());
105}
106
107static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
108{
109 put_cpu();
110}
111
Ming Leicb96a42c2014-06-01 00:43:37 +0800[diff] [blame]112struct blk_mq_alloc_data {
113 /* input parameter */
114 struct request_queue *q;
Christoph Hellwig6f3b0e82015-11-26 09:13:05 +0100[diff] [blame]115 unsigned int flags;
Omar Sandoval229a92872017-04-14 00:59:59 -0700[diff] [blame]116 unsigned int shallow_depth;
Ming Leicb96a42c2014-06-01 00:43:37 +0800[diff] [blame]117
118 /* input & output parameter */
119 struct blk_mq_ctx *ctx;
120 struct blk_mq_hw_ctx *hctx;
121};
122
Jens Axboe49411152017-01-13 08:09:05 -0700[diff] [blame]123static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
124{
Jens Axboebd166ef2017-01-17 06:03:22 -0700[diff] [blame]125 if (data->flags & BLK_MQ_REQ_INTERNAL)
126 return data->hctx->sched_tags;
127
Jens Axboe49411152017-01-13 08:09:05 -0700[diff] [blame]128 return data->hctx->tags;
129}
130
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]131/*
132 * Internal helpers for request allocation/init/free
133 */
134void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
135 struct request *rq, unsigned int op);
Jens Axboebd166ef2017-01-17 06:03:22 -0700[diff] [blame]136void __blk_mq_finish_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]137 struct request *rq);
Jens Axboebd166ef2017-01-17 06:03:22 -0700[diff] [blame]138void blk_mq_finish_request(struct request *rq);
Jens Axboe2c3ad662016-12-14 14:34:47 -0700[diff] [blame]139struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,
140 unsigned int op);
141
Bart Van Assche5d1b25c2016-10-28 17:19:15 -0700[diff] [blame]142static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
143{
144 return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
145}
146
Ming Lei19c66e52014-12-03 19:38:04 +0800[diff] [blame]147static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
148{
149 return hctx->nr_ctx && hctx->tags;
150}
151
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]152#endif