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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; | |
f70ced09 | 7 | struct blk_flush_queue; |
320ae51f JA |
8 | |
9 | struct blk_mq_cpu_notifier { | |
10 | struct list_head list; | |
11 | void *data; | |
e814e71b | 12 | int (*notify)(void *data, unsigned long action, unsigned int cpu); |
320ae51f JA |
13 | }; |
14 | ||
1429d7c9 | 15 | struct blk_mq_ctxmap { |
569fd0ce | 16 | unsigned int size; |
1429d7c9 JA |
17 | unsigned int bits_per_word; |
18 | struct blk_align_bitmap *map; | |
19 | }; | |
20 | ||
320ae51f JA |
21 | struct blk_mq_hw_ctx { |
22 | struct { | |
23 | spinlock_t lock; | |
24 | struct list_head dispatch; | |
8d354f13 | 25 | unsigned long state; /* BLK_MQ_S_* flags */ |
320ae51f JA |
26 | } ____cacheline_aligned_in_smp; |
27 | ||
27489a3c | 28 | struct work_struct run_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; | |
f70ced09 | 36 | struct blk_flush_queue *fq; |
320ae51f JA |
37 | |
38 | void *driver_data; | |
39 | ||
1429d7c9 JA |
40 | struct blk_mq_ctxmap ctx_map; |
41 | ||
4bb659b1 | 42 | struct blk_mq_ctx **ctxs; |
8d354f13 | 43 | unsigned int nr_ctx; |
4bb659b1 | 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; | |
8d354f13 | 51 | #define BLK_MQ_MAX_DISPATCH_ORDER 7 |
320ae51f JA |
52 | unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER]; |
53 | ||
320ae51f | 54 | unsigned int numa_node; |
17ded320 | 55 | unsigned int queue_num; |
320ae51f | 56 | |
0d2602ca JA |
57 | atomic_t nr_active; |
58 | ||
8d354f13 JA |
59 | struct delayed_work delay_work; |
60 | ||
320ae51f JA |
61 | struct blk_mq_cpu_notifier cpu_notifier; |
62 | struct kobject kobj; | |
05229bee | 63 | |
6e219353 | 64 | unsigned long poll_considered; |
05229bee JA |
65 | unsigned long poll_invoked; |
66 | unsigned long poll_success; | |
320ae51f JA |
67 | }; |
68 | ||
24d2f903 | 69 | struct blk_mq_tag_set { |
320ae51f JA |
70 | struct blk_mq_ops *ops; |
71 | unsigned int nr_hw_queues; | |
e3a2b3f9 | 72 | unsigned int queue_depth; /* max hw supported */ |
320ae51f JA |
73 | unsigned int reserved_tags; |
74 | unsigned int cmd_size; /* per-request extra data */ | |
75 | int numa_node; | |
76 | unsigned int timeout; | |
77 | unsigned int flags; /* BLK_MQ_F_* */ | |
24d2f903 CH |
78 | void *driver_data; |
79 | ||
80 | struct blk_mq_tags **tags; | |
0d2602ca JA |
81 | |
82 | struct mutex tag_list_lock; | |
83 | struct list_head tag_list; | |
320ae51f JA |
84 | }; |
85 | ||
74c45052 JA |
86 | struct blk_mq_queue_data { |
87 | struct request *rq; | |
88 | struct list_head *list; | |
89 | bool last; | |
90 | }; | |
91 | ||
92 | typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *); | |
320ae51f | 93 | typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int); |
0152fb6b | 94 | typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool); |
320ae51f JA |
95 | typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int); |
96 | typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int); | |
24d2f903 CH |
97 | typedef int (init_request_fn)(void *, struct request *, unsigned int, |
98 | unsigned int, unsigned int); | |
99 | typedef void (exit_request_fn)(void *, struct request *, unsigned int, | |
100 | unsigned int); | |
486cf989 | 101 | typedef int (reinit_request_fn)(void *, struct request *); |
320ae51f | 102 | |
81481eb4 CH |
103 | typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *, |
104 | bool); | |
f26cdc85 | 105 | typedef void (busy_tag_iter_fn)(struct request *, void *, bool); |
05229bee JA |
106 | typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int); |
107 | ||
81481eb4 | 108 | |
320ae51f JA |
109 | struct blk_mq_ops { |
110 | /* | |
111 | * Queue request | |
112 | */ | |
113 | queue_rq_fn *queue_rq; | |
114 | ||
115 | /* | |
116 | * Map to specific hardware queue | |
117 | */ | |
118 | map_queue_fn *map_queue; | |
119 | ||
120 | /* | |
121 | * Called on request timeout | |
122 | */ | |
0152fb6b | 123 | timeout_fn *timeout; |
320ae51f | 124 | |
05229bee JA |
125 | /* |
126 | * Called to poll for completion of a specific tag. | |
127 | */ | |
128 | poll_fn *poll; | |
129 | ||
30a91cb4 CH |
130 | softirq_done_fn *complete; |
131 | ||
320ae51f JA |
132 | /* |
133 | * Called when the block layer side of a hardware queue has been | |
134 | * set up, allowing the driver to allocate/init matching structures. | |
135 | * Ditto for exit/teardown. | |
136 | */ | |
137 | init_hctx_fn *init_hctx; | |
138 | exit_hctx_fn *exit_hctx; | |
e9b267d9 CH |
139 | |
140 | /* | |
141 | * Called for every command allocated by the block layer to allow | |
142 | * the driver to set up driver specific data. | |
f70ced09 ML |
143 | * |
144 | * Tag greater than or equal to queue_depth is for setting up | |
145 | * flush request. | |
146 | * | |
e9b267d9 CH |
147 | * Ditto for exit/teardown. |
148 | */ | |
149 | init_request_fn *init_request; | |
150 | exit_request_fn *exit_request; | |
486cf989 | 151 | reinit_request_fn *reinit_request; |
320ae51f JA |
152 | }; |
153 | ||
154 | enum { | |
155 | BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */ | |
156 | BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */ | |
157 | BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */ | |
158 | ||
159 | BLK_MQ_F_SHOULD_MERGE = 1 << 0, | |
8a58d1f1 JA |
160 | BLK_MQ_F_TAG_SHARED = 1 << 1, |
161 | BLK_MQ_F_SG_MERGE = 1 << 2, | |
e167dfb5 | 162 | BLK_MQ_F_DEFER_ISSUE = 1 << 4, |
24391c0d SL |
163 | BLK_MQ_F_ALLOC_POLICY_START_BIT = 8, |
164 | BLK_MQ_F_ALLOC_POLICY_BITS = 1, | |
320ae51f | 165 | |
5d12f905 | 166 | BLK_MQ_S_STOPPED = 0, |
0d2602ca | 167 | BLK_MQ_S_TAG_ACTIVE = 1, |
320ae51f | 168 | |
a4391c64 | 169 | BLK_MQ_MAX_DEPTH = 10240, |
506e931f JA |
170 | |
171 | BLK_MQ_CPU_WORK_BATCH = 8, | |
320ae51f | 172 | }; |
24391c0d SL |
173 | #define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \ |
174 | ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \ | |
175 | ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) | |
176 | #define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \ | |
177 | ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \ | |
178 | << BLK_MQ_F_ALLOC_POLICY_START_BIT) | |
320ae51f | 179 | |
24d2f903 | 180 | struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *); |
b62c21b7 MS |
181 | struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, |
182 | struct request_queue *q); | |
320ae51f JA |
183 | int blk_mq_register_disk(struct gendisk *); |
184 | void blk_mq_unregister_disk(struct gendisk *); | |
320ae51f | 185 | |
24d2f903 CH |
186 | int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set); |
187 | void blk_mq_free_tag_set(struct blk_mq_tag_set *set); | |
188 | ||
320ae51f JA |
189 | void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule); |
190 | ||
feb71dae | 191 | void blk_mq_insert_request(struct request *, bool, bool, bool); |
320ae51f | 192 | void blk_mq_free_request(struct request *rq); |
7c7f2f2b | 193 | void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *, struct request *rq); |
320ae51f | 194 | bool blk_mq_can_queue(struct blk_mq_hw_ctx *); |
6f3b0e8b CH |
195 | |
196 | enum { | |
197 | BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */ | |
198 | BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */ | |
199 | }; | |
200 | ||
4ce01dd1 | 201 | struct request *blk_mq_alloc_request(struct request_queue *q, int rw, |
6f3b0e8b | 202 | unsigned int flags); |
1f5bd336 ML |
203 | struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int op, |
204 | unsigned int flags, unsigned int hctx_idx); | |
0e62f51f | 205 | struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag); |
f26cdc85 | 206 | struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags); |
320ae51f | 207 | |
205fb5f5 BVA |
208 | enum { |
209 | BLK_MQ_UNIQUE_TAG_BITS = 16, | |
210 | BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1, | |
211 | }; | |
212 | ||
213 | u32 blk_mq_unique_tag(struct request *rq); | |
214 | ||
215 | static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag) | |
216 | { | |
217 | return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS; | |
218 | } | |
219 | ||
220 | static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag) | |
221 | { | |
222 | return unique_tag & BLK_MQ_UNIQUE_TAG_MASK; | |
223 | } | |
224 | ||
320ae51f | 225 | struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index); |
320ae51f | 226 | |
973c0191 | 227 | int blk_mq_request_started(struct request *rq); |
e2490073 | 228 | void blk_mq_start_request(struct request *rq); |
c8a446ad CH |
229 | void blk_mq_end_request(struct request *rq, int error); |
230 | void __blk_mq_end_request(struct request *rq, int error); | |
320ae51f | 231 | |
ed0791b2 | 232 | void blk_mq_requeue_request(struct request *rq); |
6fca6a61 | 233 | void blk_mq_add_to_requeue_list(struct request *rq, bool at_head); |
c68ed59f | 234 | void blk_mq_cancel_requeue_work(struct request_queue *q); |
6fca6a61 | 235 | void blk_mq_kick_requeue_list(struct request_queue *q); |
2849450a | 236 | void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs); |
1885b24d | 237 | void blk_mq_abort_requeue_list(struct request_queue *q); |
f4829a9b | 238 | void blk_mq_complete_request(struct request *rq, int error); |
30a91cb4 | 239 | |
320ae51f JA |
240 | void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx); |
241 | void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx); | |
280d45f6 | 242 | void blk_mq_stop_hw_queues(struct request_queue *q); |
2f268556 | 243 | void blk_mq_start_hw_queues(struct request_queue *q); |
1b4a3258 | 244 | void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async); |
b94ec296 | 245 | void blk_mq_run_hw_queues(struct request_queue *q, bool async); |
70f4db63 | 246 | void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs); |
e0489487 SG |
247 | void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, |
248 | busy_tag_iter_fn *fn, void *priv); | |
c761d96b | 249 | void blk_mq_freeze_queue(struct request_queue *q); |
b4c6a028 KB |
250 | void blk_mq_unfreeze_queue(struct request_queue *q); |
251 | void blk_mq_freeze_queue_start(struct request_queue *q); | |
486cf989 | 252 | int blk_mq_reinit_tagset(struct blk_mq_tag_set *set); |
320ae51f | 253 | |
868f2f0b KB |
254 | void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues); |
255 | ||
320ae51f JA |
256 | /* |
257 | * Driver command data is immediately after the request. So subtract request | |
2963e3f7 | 258 | * size to get back to the original request, add request size to get the PDU. |
320ae51f JA |
259 | */ |
260 | static inline struct request *blk_mq_rq_from_pdu(void *pdu) | |
261 | { | |
262 | return pdu - sizeof(struct request); | |
263 | } | |
264 | static inline void *blk_mq_rq_to_pdu(struct request *rq) | |
265 | { | |
2963e3f7 | 266 | return rq + 1; |
320ae51f JA |
267 | } |
268 | ||
320ae51f | 269 | #define queue_for_each_hw_ctx(q, hctx, i) \ |
0d0b7d42 JA |
270 | for ((i) = 0; (i) < (q)->nr_hw_queues && \ |
271 | ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++) | |
320ae51f | 272 | |
320ae51f | 273 | #define hctx_for_each_ctx(hctx, ctx, i) \ |
0d0b7d42 JA |
274 | for ((i) = 0; (i) < (hctx)->nr_ctx && \ |
275 | ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++) | |
320ae51f | 276 | |
320ae51f | 277 | #endif |