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1 | #ifndef INT_BLK_MQ_H | |
2 | #define INT_BLK_MQ_H | |
3 | ||
4 | #include "blk-stat.h" | |
5 | ||
6 | struct blk_mq_tag_set; | |
7 | ||
8 | struct 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 | ||
28 | void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); | |
29 | void blk_mq_freeze_queue(struct request_queue *q); | |
30 | void blk_mq_free_queue(struct request_queue *q); | |
31 | int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr); | |
32 | void blk_mq_wake_waiters(struct request_queue *q); | |
33 | bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool); | |
34 | void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list); | |
35 | bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx); | |
36 | bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx, | |
37 | bool wait); | |
38 | struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx, | |
39 | struct blk_mq_ctx *start); | |
40 | ||
41 | /* | |
42 | * Internal helpers for allocating/freeing the request map | |
43 | */ | |
44 | void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, | |
45 | unsigned int hctx_idx); | |
46 | void blk_mq_free_rq_map(struct blk_mq_tags *tags); | |
47 | struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set, | |
48 | unsigned int hctx_idx, | |
49 | unsigned int nr_tags, | |
50 | unsigned int reserved_tags); | |
51 | int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, | |
52 | unsigned int hctx_idx, unsigned int depth); | |
53 | ||
54 | /* | |
55 | * Internal helpers for request insertion into sw queues | |
56 | */ | |
57 | void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, | |
58 | bool at_head); | |
59 | void blk_mq_request_bypass_insert(struct request *rq); | |
60 | void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, | |
61 | struct list_head *list); | |
62 | ||
63 | /* | |
64 | * CPU -> queue mappings | |
65 | */ | |
66 | extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int); | |
67 | ||
68 | static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, | |
69 | int cpu) | |
70 | { | |
71 | return q->queue_hw_ctx[q->mq_map[cpu]]; | |
72 | } | |
73 | ||
74 | /* | |
75 | * sysfs helpers | |
76 | */ | |
77 | extern void blk_mq_sysfs_init(struct request_queue *q); | |
78 | extern void blk_mq_sysfs_deinit(struct request_queue *q); | |
79 | extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q); | |
80 | extern int blk_mq_sysfs_register(struct request_queue *q); | |
81 | extern void blk_mq_sysfs_unregister(struct request_queue *q); | |
82 | extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx); | |
83 | ||
84 | extern void blk_mq_rq_timed_out(struct request *req, bool reserved); | |
85 | ||
86 | void blk_mq_release(struct request_queue *q); | |
87 | ||
88 | static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, | |
89 | unsigned int cpu) | |
90 | { | |
91 | return per_cpu_ptr(q->queue_ctx, cpu); | |
92 | } | |
93 | ||
94 | /* | |
95 | * This assumes per-cpu software queueing queues. They could be per-node | |
96 | * as well, for instance. For now this is hardcoded as-is. Note that we don't | |
97 | * care about preemption, since we know the ctx's are persistent. This does | |
98 | * mean that we can't rely on ctx always matching the currently running CPU. | |
99 | */ | |
100 | static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) | |
101 | { | |
102 | return __blk_mq_get_ctx(q, get_cpu()); | |
103 | } | |
104 | ||
105 | static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) | |
106 | { | |
107 | put_cpu(); | |
108 | } | |
109 | ||
110 | struct blk_mq_alloc_data { | |
111 | /* input parameter */ | |
112 | struct request_queue *q; | |
113 | unsigned int flags; | |
114 | unsigned int shallow_depth; | |
115 | ||
116 | /* input & output parameter */ | |
117 | struct blk_mq_ctx *ctx; | |
118 | struct blk_mq_hw_ctx *hctx; | |
119 | }; | |
120 | ||
121 | static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data) | |
122 | { | |
123 | if (data->flags & BLK_MQ_REQ_INTERNAL) | |
124 | return data->hctx->sched_tags; | |
125 | ||
126 | return data->hctx->tags; | |
127 | } | |
128 | ||
129 | static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx) | |
130 | { | |
131 | return test_bit(BLK_MQ_S_STOPPED, &hctx->state); | |
132 | } | |
133 | ||
134 | static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) | |
135 | { | |
136 | return hctx->nr_ctx && hctx->tags; | |
137 | } | |
138 | ||
139 | void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part, | |
140 | unsigned int inflight[2]); | |
141 | ||
142 | static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx) | |
143 | { | |
144 | struct request_queue *q = hctx->queue; | |
145 | ||
146 | if (q->mq_ops->put_budget) | |
147 | q->mq_ops->put_budget(hctx); | |
148 | } | |
149 | ||
150 | static inline blk_status_t blk_mq_get_dispatch_budget( | |
151 | struct blk_mq_hw_ctx *hctx) | |
152 | { | |
153 | struct request_queue *q = hctx->queue; | |
154 | ||
155 | if (q->mq_ops->get_budget) | |
156 | return q->mq_ops->get_budget(hctx); | |
157 | return BLK_STS_OK; | |
158 | } | |
159 | ||
160 | #endif |