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320ae51f JA |
1 | #ifndef BLK_MQ_H |
2 | #define BLK_MQ_H | |
3 | ||
4 | #include <linux/blkdev.h> | |
5 | ||
6 | struct blk_mq_tags; | |
7 | ||
8 | struct blk_mq_cpu_notifier { | |
9 | struct list_head list; | |
10 | void *data; | |
11 | void (*notify)(void *data, unsigned long action, unsigned int cpu); | |
12 | }; | |
13 | ||
14 | struct blk_mq_hw_ctx { | |
15 | struct { | |
16 | spinlock_t lock; | |
17 | struct list_head dispatch; | |
18 | } ____cacheline_aligned_in_smp; | |
19 | ||
20 | unsigned long state; /* BLK_MQ_S_* flags */ | |
21 | struct delayed_work delayed_work; | |
22 | ||
23 | unsigned long flags; /* BLK_MQ_F_* flags */ | |
24 | ||
25 | struct request_queue *queue; | |
26 | unsigned int queue_num; | |
27 | ||
28 | void *driver_data; | |
29 | ||
30 | unsigned int nr_ctx; | |
31 | struct blk_mq_ctx **ctxs; | |
32 | unsigned int nr_ctx_map; | |
33 | unsigned long *ctx_map; | |
34 | ||
35 | struct request **rqs; | |
36 | struct list_head page_list; | |
37 | struct blk_mq_tags *tags; | |
38 | ||
f0276924 SL |
39 | atomic_t pending_flush; |
40 | ||
320ae51f JA |
41 | unsigned long queued; |
42 | unsigned long run; | |
43 | #define BLK_MQ_MAX_DISPATCH_ORDER 10 | |
44 | unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER]; | |
45 | ||
46 | unsigned int queue_depth; | |
f0276924 | 47 | unsigned int reserved_tags; |
320ae51f JA |
48 | unsigned int numa_node; |
49 | unsigned int cmd_size; /* per-request extra data */ | |
50 | ||
51 | struct blk_mq_cpu_notifier cpu_notifier; | |
52 | struct kobject kobj; | |
53 | }; | |
54 | ||
55 | struct blk_mq_reg { | |
56 | struct blk_mq_ops *ops; | |
57 | unsigned int nr_hw_queues; | |
58 | unsigned int queue_depth; | |
59 | unsigned int reserved_tags; | |
60 | unsigned int cmd_size; /* per-request extra data */ | |
61 | int numa_node; | |
62 | unsigned int timeout; | |
63 | unsigned int flags; /* BLK_MQ_F_* */ | |
64 | }; | |
65 | ||
66 | typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *); | |
67 | typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int); | |
68 | typedef struct blk_mq_hw_ctx *(alloc_hctx_fn)(struct blk_mq_reg *,unsigned int); | |
69 | typedef void (free_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int); | |
70 | typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int); | |
71 | typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int); | |
72 | ||
73 | struct blk_mq_ops { | |
74 | /* | |
75 | * Queue request | |
76 | */ | |
77 | queue_rq_fn *queue_rq; | |
78 | ||
79 | /* | |
80 | * Map to specific hardware queue | |
81 | */ | |
82 | map_queue_fn *map_queue; | |
83 | ||
84 | /* | |
85 | * Called on request timeout | |
86 | */ | |
87 | rq_timed_out_fn *timeout; | |
88 | ||
30a91cb4 CH |
89 | softirq_done_fn *complete; |
90 | ||
320ae51f JA |
91 | /* |
92 | * Override for hctx allocations (should probably go) | |
93 | */ | |
94 | alloc_hctx_fn *alloc_hctx; | |
95 | free_hctx_fn *free_hctx; | |
96 | ||
97 | /* | |
98 | * Called when the block layer side of a hardware queue has been | |
99 | * set up, allowing the driver to allocate/init matching structures. | |
100 | * Ditto for exit/teardown. | |
101 | */ | |
102 | init_hctx_fn *init_hctx; | |
103 | exit_hctx_fn *exit_hctx; | |
104 | }; | |
105 | ||
106 | enum { | |
107 | BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */ | |
108 | BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */ | |
109 | BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */ | |
110 | ||
111 | BLK_MQ_F_SHOULD_MERGE = 1 << 0, | |
112 | BLK_MQ_F_SHOULD_SORT = 1 << 1, | |
113 | BLK_MQ_F_SHOULD_IPI = 1 << 2, | |
114 | ||
115 | BLK_MQ_S_STOPPED = 1 << 0, | |
116 | ||
117 | BLK_MQ_MAX_DEPTH = 2048, | |
118 | }; | |
119 | ||
120 | struct request_queue *blk_mq_init_queue(struct blk_mq_reg *, void *); | |
320ae51f JA |
121 | int blk_mq_register_disk(struct gendisk *); |
122 | void blk_mq_unregister_disk(struct gendisk *); | |
123 | void blk_mq_init_commands(struct request_queue *, void (*init)(void *data, struct blk_mq_hw_ctx *, struct request *, unsigned int), void *data); | |
124 | ||
125 | void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule); | |
126 | ||
72a0a36e CH |
127 | void blk_mq_insert_request(struct request_queue *, struct request *, |
128 | bool, bool); | |
320ae51f JA |
129 | void blk_mq_run_queues(struct request_queue *q, bool async); |
130 | void blk_mq_free_request(struct request *rq); | |
131 | bool blk_mq_can_queue(struct blk_mq_hw_ctx *); | |
3228f48b | 132 | struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp, bool reserved); |
320ae51f JA |
133 | struct request *blk_mq_alloc_reserved_request(struct request_queue *q, int rw, gfp_t gfp); |
134 | struct request *blk_mq_rq_from_tag(struct request_queue *q, unsigned int tag); | |
135 | ||
136 | struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index); | |
137 | struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_reg *, unsigned int); | |
138 | void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int); | |
139 | ||
140 | void blk_mq_end_io(struct request *rq, int error); | |
141 | ||
30a91cb4 CH |
142 | void blk_mq_complete_request(struct request *rq); |
143 | ||
320ae51f JA |
144 | void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx); |
145 | void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx); | |
280d45f6 | 146 | void blk_mq_stop_hw_queues(struct request_queue *q); |
320ae51f JA |
147 | void blk_mq_start_stopped_hw_queues(struct request_queue *q); |
148 | ||
149 | /* | |
150 | * Driver command data is immediately after the request. So subtract request | |
151 | * size to get back to the original request. | |
152 | */ | |
153 | static inline struct request *blk_mq_rq_from_pdu(void *pdu) | |
154 | { | |
155 | return pdu - sizeof(struct request); | |
156 | } | |
157 | static inline void *blk_mq_rq_to_pdu(struct request *rq) | |
158 | { | |
159 | return (void *) rq + sizeof(*rq); | |
160 | } | |
161 | ||
162 | static inline struct request *blk_mq_tag_to_rq(struct blk_mq_hw_ctx *hctx, | |
163 | unsigned int tag) | |
164 | { | |
165 | return hctx->rqs[tag]; | |
166 | } | |
167 | ||
168 | #define queue_for_each_hw_ctx(q, hctx, i) \ | |
0d0b7d42 JA |
169 | for ((i) = 0; (i) < (q)->nr_hw_queues && \ |
170 | ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++) | |
320ae51f JA |
171 | |
172 | #define queue_for_each_ctx(q, ctx, i) \ | |
0d0b7d42 JA |
173 | for ((i) = 0; (i) < (q)->nr_queues && \ |
174 | ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++) | |
320ae51f JA |
175 | |
176 | #define hctx_for_each_ctx(hctx, ctx, i) \ | |
0d0b7d42 JA |
177 | for ((i) = 0; (i) < (hctx)->nr_ctx && \ |
178 | ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++) | |
320ae51f JA |
179 | |
180 | #define blk_ctx_sum(q, sum) \ | |
181 | ({ \ | |
182 | struct blk_mq_ctx *__x; \ | |
183 | unsigned int __ret = 0, __i; \ | |
184 | \ | |
185 | queue_for_each_ctx((q), __x, __i) \ | |
186 | __ret += sum; \ | |
187 | __ret; \ | |
188 | }) | |
189 | ||
190 | #endif |