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1 | #ifndef INT_BLK_MQ_H |
2 | #define INT_BLK_MQ_H |
3 | |
4 | struct blk_mq_tag_set; |
5 | |
6 | struct 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 | unsigned int last_tag ____cacheline_aligned_in_smp; |
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_complete_request(struct request *rq); |
29 | void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); |
30 | void blk_mq_freeze_queue(struct request_queue *q); |
31 | void blk_mq_free_queue(struct request_queue *q); |
32 | void blk_mq_clone_flush_request(struct request *flush_rq, |
33 | struct request *orig_rq); |
34 | int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr); |
35 | |
36 | /* |
37 | * CPU hotplug helpers |
38 | */ |
39 | struct blk_mq_cpu_notifier; |
40 | void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier, |
41 | int (*fn)(void *, unsigned long, unsigned int), |
42 | void *data); |
43 | void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier); |
44 | void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier); |
45 | void blk_mq_cpu_init(void); |
46 | void blk_mq_enable_hotplug(void); |
47 | void blk_mq_disable_hotplug(void); |
48 | |
49 | /* |
50 | * CPU -> queue mappings |
51 | */ |
52 | extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set); |
53 | extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues); |
54 | extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int); |
55 | |
56 | /* |
57 | * sysfs helpers |
58 | */ |
59 | extern int blk_mq_sysfs_register(struct request_queue *q); |
60 | extern void blk_mq_sysfs_unregister(struct request_queue *q); |
61 | |
62 | extern void blk_mq_rq_timed_out(struct request *req, bool reserved); |
63 | |
64 | /* |
65 | * Basic implementation of sparser bitmap, allowing the user to spread |
66 | * the bits over more cachelines. |
67 | */ |
68 | struct blk_align_bitmap { |
69 | unsigned long word; |
70 | unsigned long depth; |
71 | } ____cacheline_aligned_in_smp; |
72 | |
73 | static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q, |
74 | unsigned int cpu) |
75 | { |
76 | return per_cpu_ptr(q->queue_ctx, cpu); |
77 | } |
78 | |
79 | /* |
80 | * This assumes per-cpu software queueing queues. They could be per-node |
81 | * as well, for instance. For now this is hardcoded as-is. Note that we don't |
82 | * care about preemption, since we know the ctx's are persistent. This does |
83 | * mean that we can't rely on ctx always matching the currently running CPU. |
84 | */ |
85 | static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q) |
86 | { |
87 | return __blk_mq_get_ctx(q, get_cpu()); |
88 | } |
89 | |
90 | static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) |
91 | { |
92 | put_cpu(); |
93 | } |
94 | |
95 | struct blk_mq_alloc_data { |
96 | /* input parameter */ |
97 | struct request_queue *q; |
98 | gfp_t gfp; |
99 | bool reserved; |
100 | |
101 | /* input & output parameter */ |
102 | struct blk_mq_ctx *ctx; |
103 | struct blk_mq_hw_ctx *hctx; |
104 | }; |
105 | |
106 | static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data, |
107 | struct request_queue *q, gfp_t gfp, bool reserved, |
108 | struct blk_mq_ctx *ctx, |
109 | struct blk_mq_hw_ctx *hctx) |
110 | { |
111 | data->q = q; |
112 | data->gfp = gfp; |
113 | data->reserved = reserved; |
114 | data->ctx = ctx; |
115 | data->hctx = hctx; |
116 | } |
117 | |
118 | #endif |
119 |
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