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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; | |
e814e71b | 11 | int (*notify)(void *data, unsigned long action, unsigned int cpu); |
320ae51f JA |
12 | }; |
13 | ||
1429d7c9 JA |
14 | struct blk_mq_ctxmap { |
15 | unsigned int map_size; | |
16 | unsigned int bits_per_word; | |
17 | struct blk_align_bitmap *map; | |
18 | }; | |
19 | ||
320ae51f JA |
20 | struct blk_mq_hw_ctx { |
21 | struct { | |
22 | spinlock_t lock; | |
23 | struct list_head dispatch; | |
24 | } ____cacheline_aligned_in_smp; | |
25 | ||
26 | unsigned long state; /* BLK_MQ_S_* flags */ | |
70f4db63 CH |
27 | struct delayed_work run_work; |
28 | struct delayed_work delay_work; | |
e4043dcf | 29 | cpumask_var_t cpumask; |
506e931f JA |
30 | int next_cpu; |
31 | int next_cpu_batch; | |
320ae51f JA |
32 | |
33 | unsigned long flags; /* BLK_MQ_F_* flags */ | |
34 | ||
35 | struct request_queue *queue; | |
36 | unsigned int queue_num; | |
37 | ||
38 | void *driver_data; | |
39 | ||
1429d7c9 JA |
40 | struct blk_mq_ctxmap ctx_map; |
41 | ||
4bb659b1 JA |
42 | unsigned int nr_ctx; |
43 | struct blk_mq_ctx **ctxs; | |
44 | ||
8537b120 | 45 | atomic_t wait_index; |
320ae51f | 46 | |
320ae51f JA |
47 | struct blk_mq_tags *tags; |
48 | ||
49 | unsigned long queued; | |
50 | unsigned long run; | |
51 | #define BLK_MQ_MAX_DISPATCH_ORDER 10 | |
52 | unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER]; | |
53 | ||
320ae51f JA |
54 | unsigned int numa_node; |
55 | unsigned int cmd_size; /* per-request extra data */ | |
56 | ||
0d2602ca JA |
57 | atomic_t nr_active; |
58 | ||
320ae51f JA |
59 | struct blk_mq_cpu_notifier cpu_notifier; |
60 | struct kobject kobj; | |
61 | }; | |
62 | ||
24d2f903 | 63 | struct blk_mq_tag_set { |
320ae51f JA |
64 | struct blk_mq_ops *ops; |
65 | unsigned int nr_hw_queues; | |
e3a2b3f9 | 66 | unsigned int queue_depth; /* max hw supported */ |
320ae51f JA |
67 | unsigned int reserved_tags; |
68 | unsigned int cmd_size; /* per-request extra data */ | |
69 | int numa_node; | |
70 | unsigned int timeout; | |
71 | unsigned int flags; /* BLK_MQ_F_* */ | |
24d2f903 CH |
72 | void *driver_data; |
73 | ||
74 | struct blk_mq_tags **tags; | |
0d2602ca JA |
75 | |
76 | struct mutex tag_list_lock; | |
77 | struct list_head tag_list; | |
320ae51f JA |
78 | }; |
79 | ||
80 | typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *); | |
81 | typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int); | |
320ae51f JA |
82 | typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int); |
83 | typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int); | |
24d2f903 CH |
84 | typedef int (init_request_fn)(void *, struct request *, unsigned int, |
85 | unsigned int, unsigned int); | |
86 | typedef void (exit_request_fn)(void *, struct request *, unsigned int, | |
87 | unsigned int); | |
320ae51f JA |
88 | |
89 | struct blk_mq_ops { | |
90 | /* | |
91 | * Queue request | |
92 | */ | |
93 | queue_rq_fn *queue_rq; | |
94 | ||
95 | /* | |
96 | * Map to specific hardware queue | |
97 | */ | |
98 | map_queue_fn *map_queue; | |
99 | ||
100 | /* | |
101 | * Called on request timeout | |
102 | */ | |
103 | rq_timed_out_fn *timeout; | |
104 | ||
30a91cb4 CH |
105 | softirq_done_fn *complete; |
106 | ||
320ae51f JA |
107 | /* |
108 | * Called when the block layer side of a hardware queue has been | |
109 | * set up, allowing the driver to allocate/init matching structures. | |
110 | * Ditto for exit/teardown. | |
111 | */ | |
112 | init_hctx_fn *init_hctx; | |
113 | exit_hctx_fn *exit_hctx; | |
e9b267d9 CH |
114 | |
115 | /* | |
116 | * Called for every command allocated by the block layer to allow | |
117 | * the driver to set up driver specific data. | |
118 | * Ditto for exit/teardown. | |
119 | */ | |
120 | init_request_fn *init_request; | |
121 | exit_request_fn *exit_request; | |
320ae51f JA |
122 | }; |
123 | ||
124 | enum { | |
125 | BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */ | |
126 | BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */ | |
127 | BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */ | |
128 | ||
129 | BLK_MQ_F_SHOULD_MERGE = 1 << 0, | |
8a58d1f1 JA |
130 | BLK_MQ_F_TAG_SHARED = 1 << 1, |
131 | BLK_MQ_F_SG_MERGE = 1 << 2, | |
132 | BLK_MQ_F_SYSFS_UP = 1 << 3, | |
320ae51f | 133 | |
5d12f905 | 134 | BLK_MQ_S_STOPPED = 0, |
0d2602ca | 135 | BLK_MQ_S_TAG_ACTIVE = 1, |
320ae51f | 136 | |
a4391c64 | 137 | BLK_MQ_MAX_DEPTH = 10240, |
506e931f JA |
138 | |
139 | BLK_MQ_CPU_WORK_BATCH = 8, | |
320ae51f JA |
140 | }; |
141 | ||
24d2f903 | 142 | struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *); |
320ae51f JA |
143 | int blk_mq_register_disk(struct gendisk *); |
144 | void blk_mq_unregister_disk(struct gendisk *); | |
320ae51f | 145 | |
24d2f903 CH |
146 | int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set); |
147 | void blk_mq_free_tag_set(struct blk_mq_tag_set *set); | |
148 | ||
320ae51f JA |
149 | void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule); |
150 | ||
feb71dae | 151 | void blk_mq_insert_request(struct request *, bool, bool, bool); |
320ae51f JA |
152 | void blk_mq_run_queues(struct request_queue *q, bool async); |
153 | void blk_mq_free_request(struct request *rq); | |
154 | bool blk_mq_can_queue(struct blk_mq_hw_ctx *); | |
4ce01dd1 CH |
155 | struct request *blk_mq_alloc_request(struct request_queue *q, int rw, |
156 | gfp_t gfp, bool reserved); | |
0e62f51f | 157 | struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag); |
320ae51f JA |
158 | |
159 | struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index); | |
f14bbe77 | 160 | struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int); |
320ae51f | 161 | |
63151a44 CH |
162 | void blk_mq_end_io(struct request *rq, int error); |
163 | void __blk_mq_end_io(struct request *rq, int error); | |
320ae51f | 164 | |
ed0791b2 | 165 | void blk_mq_requeue_request(struct request *rq); |
6fca6a61 CH |
166 | void blk_mq_add_to_requeue_list(struct request *rq, bool at_head); |
167 | void blk_mq_kick_requeue_list(struct request_queue *q); | |
30a91cb4 CH |
168 | void blk_mq_complete_request(struct request *rq); |
169 | ||
320ae51f JA |
170 | void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx); |
171 | void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx); | |
280d45f6 | 172 | void blk_mq_stop_hw_queues(struct request_queue *q); |
2f268556 | 173 | void blk_mq_start_hw_queues(struct request_queue *q); |
1b4a3258 | 174 | void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async); |
70f4db63 | 175 | void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs); |
edf866b3 | 176 | void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data); |
320ae51f JA |
177 | |
178 | /* | |
179 | * Driver command data is immediately after the request. So subtract request | |
180 | * size to get back to the original request. | |
181 | */ | |
182 | static inline struct request *blk_mq_rq_from_pdu(void *pdu) | |
183 | { | |
184 | return pdu - sizeof(struct request); | |
185 | } | |
186 | static inline void *blk_mq_rq_to_pdu(struct request *rq) | |
187 | { | |
188 | return (void *) rq + sizeof(*rq); | |
189 | } | |
190 | ||
320ae51f | 191 | #define queue_for_each_hw_ctx(q, hctx, i) \ |
0d0b7d42 JA |
192 | for ((i) = 0; (i) < (q)->nr_hw_queues && \ |
193 | ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++) | |
320ae51f JA |
194 | |
195 | #define queue_for_each_ctx(q, ctx, i) \ | |
0d0b7d42 JA |
196 | for ((i) = 0; (i) < (q)->nr_queues && \ |
197 | ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++) | |
320ae51f JA |
198 | |
199 | #define hctx_for_each_ctx(hctx, ctx, i) \ | |
0d0b7d42 JA |
200 | for ((i) = 0; (i) < (hctx)->nr_ctx && \ |
201 | ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++) | |
320ae51f JA |
202 | |
203 | #define blk_ctx_sum(q, sum) \ | |
204 | ({ \ | |
205 | struct blk_mq_ctx *__x; \ | |
206 | unsigned int __ret = 0, __i; \ | |
207 | \ | |
208 | queue_for_each_ctx((q), __x, __i) \ | |
209 | __ret += sum; \ | |
210 | __ret; \ | |
211 | }) | |
212 | ||
213 | #endif |