Linux kernel mirror (for testing)
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1#ifndef INT_BLK_MQ_H
2#define INT_BLK_MQ_H
3
4#include "blk-stat.h"
5
6struct blk_mq_tag_set;
7
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;
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;
26} ____cacheline_aligned_in_smp;
27
28void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
29void blk_mq_freeze_queue(struct request_queue *q);
30void blk_mq_free_queue(struct request_queue *q);
31int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
32void blk_mq_wake_waiters(struct request_queue *q);
33bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *);
34void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
35bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx);
36bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
37 bool wait);
38
39/*
40 * Internal helpers for allocating/freeing the request map
41 */
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);
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);
57void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
58 struct list_head *list);
59/*
60 * CPU hotplug helpers
61 */
62void blk_mq_enable_hotplug(void);
63void blk_mq_disable_hotplug(void);
64
65/*
66 * CPU -> queue mappings
67 */
68extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
69
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
76/*
77 * sysfs helpers
78 */
79extern void blk_mq_sysfs_init(struct request_queue *q);
80extern void blk_mq_sysfs_deinit(struct request_queue *q);
81extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
82extern int blk_mq_sysfs_register(struct request_queue *q);
83extern void blk_mq_sysfs_unregister(struct request_queue *q);
84extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
85
86extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
87
88void blk_mq_release(struct request_queue *q);
89
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
112struct blk_mq_alloc_data {
113 /* input parameter */
114 struct request_queue *q;
115 unsigned int flags;
116 unsigned int shallow_depth;
117
118 /* input & output parameter */
119 struct blk_mq_ctx *ctx;
120 struct blk_mq_hw_ctx *hctx;
121};
122
123static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
124{
125 if (data->flags & BLK_MQ_REQ_INTERNAL)
126 return data->hctx->sched_tags;
127
128 return data->hctx->tags;
129}
130
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);
136void __blk_mq_finish_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
137 struct request *rq);
138void blk_mq_finish_request(struct request *rq);
139struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,
140 unsigned int op);
141
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
147static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
148{
149 return hctx->nr_ctx && hctx->tags;
150}
151
152#endif