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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 */ | |
70f4db63 CH |
21 | struct delayed_work run_work; |
22 | struct delayed_work delay_work; | |
e4043dcf | 23 | cpumask_var_t cpumask; |
320ae51f JA |
24 | |
25 | unsigned long flags; /* BLK_MQ_F_* flags */ | |
26 | ||
27 | struct request_queue *queue; | |
28 | unsigned int queue_num; | |
29 | ||
30 | void *driver_data; | |
31 | ||
32 | unsigned int nr_ctx; | |
33 | struct blk_mq_ctx **ctxs; | |
34 | unsigned int nr_ctx_map; | |
35 | unsigned long *ctx_map; | |
36 | ||
320ae51f JA |
37 | struct blk_mq_tags *tags; |
38 | ||
39 | unsigned long queued; | |
40 | unsigned long run; | |
41 | #define BLK_MQ_MAX_DISPATCH_ORDER 10 | |
42 | unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER]; | |
43 | ||
320ae51f JA |
44 | unsigned int numa_node; |
45 | unsigned int cmd_size; /* per-request extra data */ | |
46 | ||
47 | struct blk_mq_cpu_notifier cpu_notifier; | |
48 | struct kobject kobj; | |
49 | }; | |
50 | ||
24d2f903 | 51 | struct blk_mq_tag_set { |
320ae51f JA |
52 | struct blk_mq_ops *ops; |
53 | unsigned int nr_hw_queues; | |
54 | unsigned int queue_depth; | |
55 | unsigned int reserved_tags; | |
56 | unsigned int cmd_size; /* per-request extra data */ | |
57 | int numa_node; | |
58 | unsigned int timeout; | |
59 | unsigned int flags; /* BLK_MQ_F_* */ | |
24d2f903 CH |
60 | void *driver_data; |
61 | ||
62 | struct blk_mq_tags **tags; | |
320ae51f JA |
63 | }; |
64 | ||
65 | typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *); | |
66 | typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int); | |
24d2f903 CH |
67 | typedef struct blk_mq_hw_ctx *(alloc_hctx_fn)(struct blk_mq_tag_set *, |
68 | unsigned int); | |
320ae51f JA |
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); | |
24d2f903 CH |
72 | typedef int (init_request_fn)(void *, struct request *, unsigned int, |
73 | unsigned int, unsigned int); | |
74 | typedef void (exit_request_fn)(void *, struct request *, unsigned int, | |
75 | unsigned int); | |
320ae51f JA |
76 | |
77 | struct blk_mq_ops { | |
78 | /* | |
79 | * Queue request | |
80 | */ | |
81 | queue_rq_fn *queue_rq; | |
82 | ||
83 | /* | |
84 | * Map to specific hardware queue | |
85 | */ | |
86 | map_queue_fn *map_queue; | |
87 | ||
88 | /* | |
89 | * Called on request timeout | |
90 | */ | |
91 | rq_timed_out_fn *timeout; | |
92 | ||
30a91cb4 CH |
93 | softirq_done_fn *complete; |
94 | ||
320ae51f JA |
95 | /* |
96 | * Override for hctx allocations (should probably go) | |
97 | */ | |
98 | alloc_hctx_fn *alloc_hctx; | |
99 | free_hctx_fn *free_hctx; | |
100 | ||
101 | /* | |
102 | * Called when the block layer side of a hardware queue has been | |
103 | * set up, allowing the driver to allocate/init matching structures. | |
104 | * Ditto for exit/teardown. | |
105 | */ | |
106 | init_hctx_fn *init_hctx; | |
107 | exit_hctx_fn *exit_hctx; | |
e9b267d9 CH |
108 | |
109 | /* | |
110 | * Called for every command allocated by the block layer to allow | |
111 | * the driver to set up driver specific data. | |
112 | * Ditto for exit/teardown. | |
113 | */ | |
114 | init_request_fn *init_request; | |
115 | exit_request_fn *exit_request; | |
320ae51f JA |
116 | }; |
117 | ||
118 | enum { | |
119 | BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */ | |
120 | BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */ | |
121 | BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */ | |
122 | ||
123 | BLK_MQ_F_SHOULD_MERGE = 1 << 0, | |
124 | BLK_MQ_F_SHOULD_SORT = 1 << 1, | |
125 | BLK_MQ_F_SHOULD_IPI = 1 << 2, | |
126 | ||
5d12f905 | 127 | BLK_MQ_S_STOPPED = 0, |
320ae51f JA |
128 | |
129 | BLK_MQ_MAX_DEPTH = 2048, | |
130 | }; | |
131 | ||
24d2f903 | 132 | struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *); |
320ae51f JA |
133 | int blk_mq_register_disk(struct gendisk *); |
134 | void blk_mq_unregister_disk(struct gendisk *); | |
320ae51f | 135 | |
24d2f903 CH |
136 | int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set); |
137 | void blk_mq_free_tag_set(struct blk_mq_tag_set *set); | |
138 | ||
320ae51f JA |
139 | void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule); |
140 | ||
feb71dae | 141 | void blk_mq_insert_request(struct request *, bool, bool, bool); |
320ae51f JA |
142 | void blk_mq_run_queues(struct request_queue *q, bool async); |
143 | void blk_mq_free_request(struct request *rq); | |
144 | bool blk_mq_can_queue(struct blk_mq_hw_ctx *); | |
18741986 | 145 | struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp); |
320ae51f | 146 | struct request *blk_mq_alloc_reserved_request(struct request_queue *q, int rw, gfp_t gfp); |
24d2f903 | 147 | struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag); |
320ae51f JA |
148 | |
149 | struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index); | |
24d2f903 | 150 | struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int); |
320ae51f JA |
151 | void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int); |
152 | ||
63151a44 CH |
153 | void blk_mq_end_io(struct request *rq, int error); |
154 | void __blk_mq_end_io(struct request *rq, int error); | |
320ae51f | 155 | |
30a91cb4 CH |
156 | void blk_mq_complete_request(struct request *rq); |
157 | ||
320ae51f JA |
158 | void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx); |
159 | void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx); | |
280d45f6 | 160 | void blk_mq_stop_hw_queues(struct request_queue *q); |
2f268556 | 161 | void blk_mq_start_hw_queues(struct request_queue *q); |
1b4a3258 | 162 | void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async); |
70f4db63 | 163 | void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs); |
320ae51f JA |
164 | |
165 | /* | |
166 | * Driver command data is immediately after the request. So subtract request | |
167 | * size to get back to the original request. | |
168 | */ | |
169 | static inline struct request *blk_mq_rq_from_pdu(void *pdu) | |
170 | { | |
171 | return pdu - sizeof(struct request); | |
172 | } | |
173 | static inline void *blk_mq_rq_to_pdu(struct request *rq) | |
174 | { | |
175 | return (void *) rq + sizeof(*rq); | |
176 | } | |
177 | ||
320ae51f | 178 | #define queue_for_each_hw_ctx(q, hctx, i) \ |
0d0b7d42 JA |
179 | for ((i) = 0; (i) < (q)->nr_hw_queues && \ |
180 | ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++) | |
320ae51f JA |
181 | |
182 | #define queue_for_each_ctx(q, ctx, i) \ | |
0d0b7d42 JA |
183 | for ((i) = 0; (i) < (q)->nr_queues && \ |
184 | ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++) | |
320ae51f JA |
185 | |
186 | #define hctx_for_each_ctx(hctx, ctx, i) \ | |
0d0b7d42 JA |
187 | for ((i) = 0; (i) < (hctx)->nr_ctx && \ |
188 | ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++) | |
320ae51f JA |
189 | |
190 | #define blk_ctx_sum(q, sum) \ | |
191 | ({ \ | |
192 | struct blk_mq_ctx *__x; \ | |
193 | unsigned int __ret = 0, __i; \ | |
194 | \ | |
195 | queue_for_each_ctx((q), __x, __i) \ | |
196 | __ret += sum; \ | |
197 | __ret; \ | |
198 | }) | |
199 | ||
200 | #endif |