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Linux kernel mirror (for testing)
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kernel
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linux
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/*
61 * CPU -> queue mappings
62 */
63extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
64
65static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
66 int cpu)
67{
68 return q->queue_hw_ctx[q->mq_map[cpu]];
69}
70
71/*
72 * sysfs helpers
73 */
74extern void blk_mq_sysfs_init(struct request_queue *q);
75extern void blk_mq_sysfs_deinit(struct request_queue *q);
76extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
77extern int blk_mq_sysfs_register(struct request_queue *q);
78extern void blk_mq_sysfs_unregister(struct request_queue *q);
79extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
80
81extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
82
83void blk_mq_release(struct request_queue *q);
84
85static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
86 unsigned int cpu)
87{
88 return per_cpu_ptr(q->queue_ctx, cpu);
89}
90
91/*
92 * This assumes per-cpu software queueing queues. They could be per-node
93 * as well, for instance. For now this is hardcoded as-is. Note that we don't
94 * care about preemption, since we know the ctx's are persistent. This does
95 * mean that we can't rely on ctx always matching the currently running CPU.
96 */
97static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
98{
99 return __blk_mq_get_ctx(q, get_cpu());
100}
101
102static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
103{
104 put_cpu();
105}
106
107struct blk_mq_alloc_data {
108 /* input parameter */
109 struct request_queue *q;
110 unsigned int flags;
111 unsigned int shallow_depth;
112
113 /* input & output parameter */
114 struct blk_mq_ctx *ctx;
115 struct blk_mq_hw_ctx *hctx;
116};
117
118static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
119{
120 if (data->flags & BLK_MQ_REQ_INTERNAL)
121 return data->hctx->sched_tags;
122
123 return data->hctx->tags;
124}
125
126static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
127{
128 return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
129}
130
131static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
132{
133 return hctx->nr_ctx && hctx->tags;
134}
135
136#endif