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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
4struct blk_mq_tag_set;
5
6struct blk_mq_ctx {
7 struct {
8 spinlock_t lock;
9 struct list_head rq_list;
10 } ____cacheline_aligned_in_smp;
11
12 unsigned int cpu;
13 unsigned int index_hw;
14
15 /* incremented at dispatch time */
16 unsigned long rq_dispatched[2];
17 unsigned long rq_merged;
18
19 /* incremented at completion time */
20 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
21
22 struct request_queue *queue;
23 struct kobject kobj;
24} ____cacheline_aligned_in_smp;
25
26void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
27void blk_mq_freeze_queue(struct request_queue *q);
28void blk_mq_free_queue(struct request_queue *q);
29int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
30void blk_mq_wake_waiters(struct request_queue *q);
31
32/*
33 * CPU hotplug helpers
34 */
35void blk_mq_enable_hotplug(void);
36void blk_mq_disable_hotplug(void);
37
38/*
39 * CPU -> queue mappings
40 */
41int blk_mq_map_queues(struct blk_mq_tag_set *set);
42extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
43
44static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
45 int cpu)
46{
47 return q->queue_hw_ctx[q->mq_map[cpu]];
48}
49
50/*
51 * sysfs helpers
52 */
53extern int blk_mq_sysfs_register(struct request_queue *q);
54extern void blk_mq_sysfs_unregister(struct request_queue *q);
55extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
56
57extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
58
59void blk_mq_release(struct request_queue *q);
60
61static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
62 unsigned int cpu)
63{
64 return per_cpu_ptr(q->queue_ctx, cpu);
65}
66
67/*
68 * This assumes per-cpu software queueing queues. They could be per-node
69 * as well, for instance. For now this is hardcoded as-is. Note that we don't
70 * care about preemption, since we know the ctx's are persistent. This does
71 * mean that we can't rely on ctx always matching the currently running CPU.
72 */
73static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
74{
75 return __blk_mq_get_ctx(q, get_cpu());
76}
77
78static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
79{
80 put_cpu();
81}
82
83struct blk_mq_alloc_data {
84 /* input parameter */
85 struct request_queue *q;
86 unsigned int flags;
87
88 /* input & output parameter */
89 struct blk_mq_ctx *ctx;
90 struct blk_mq_hw_ctx *hctx;
91};
92
93static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
94 struct request_queue *q, unsigned int flags,
95 struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
96{
97 data->q = q;
98 data->flags = flags;
99 data->ctx = ctx;
100 data->hctx = hctx;
101}
102
103static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
104{
105 return hctx->nr_ctx && hctx->tags;
106}
107
108#endif