1
2#ifndef BLK_MQ_H
3#define BLK_MQ_H
4
5#include <linux/blkdev.h>
6#include <linux/sbitmap.h>
7#include <linux/srcu.h>
8
9struct blk_mq_tags;
10struct blk_flush_queue;
11
12
13
14
15struct blk_mq_hw_ctx {
16 struct {
17 spinlock_t lock;
18 struct list_head dispatch;
19 unsigned long state;
20 } ____cacheline_aligned_in_smp;
21
22 struct delayed_work run_work;
23 cpumask_var_t cpumask;
24 int next_cpu;
25 int next_cpu_batch;
26
27 unsigned long flags;
28
29 void *sched_data;
30 struct request_queue *queue;
31 struct blk_flush_queue *fq;
32
33 void *driver_data;
34
35 struct sbitmap ctx_map;
36
37 struct blk_mq_ctx *dispatch_from;
38 unsigned int dispatch_busy;
39
40 unsigned short type;
41 unsigned short nr_ctx;
42 struct blk_mq_ctx **ctxs;
43
44 spinlock_t dispatch_wait_lock;
45 wait_queue_entry_t dispatch_wait;
46 atomic_t wait_index;
47
48 struct blk_mq_tags *tags;
49 struct blk_mq_tags *sched_tags;
50
51 unsigned long queued;
52 unsigned long run;
53#define BLK_MQ_MAX_DISPATCH_ORDER 7
54 unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
55
56 unsigned int numa_node;
57 unsigned int queue_num;
58
59 atomic_t nr_active;
60
61 struct hlist_node cpuhp_dead;
62 struct kobject kobj;
63
64 unsigned long poll_considered;
65 unsigned long poll_invoked;
66 unsigned long poll_success;
67
68#ifdef CONFIG_BLK_DEBUG_FS
69 struct dentry *debugfs_dir;
70 struct dentry *sched_debugfs_dir;
71#endif
72
73 struct list_head hctx_list;
74
75
76 struct srcu_struct srcu[0];
77};
78
79struct blk_mq_queue_map {
80 unsigned int *mq_map;
81 unsigned int nr_queues;
82 unsigned int queue_offset;
83};
84
85enum hctx_type {
86 HCTX_TYPE_DEFAULT,
87 HCTX_TYPE_READ,
88 HCTX_TYPE_POLL,
89
90 HCTX_MAX_TYPES,
91};
92
93struct blk_mq_tag_set {
94
95
96
97
98
99
100 struct blk_mq_queue_map map[HCTX_MAX_TYPES];
101 unsigned int nr_maps;
102 const struct blk_mq_ops *ops;
103 unsigned int nr_hw_queues;
104 unsigned int queue_depth;
105 unsigned int reserved_tags;
106 unsigned int cmd_size;
107 int numa_node;
108 unsigned int timeout;
109 unsigned int flags;
110 void *driver_data;
111
112 struct blk_mq_tags **tags;
113
114 struct mutex tag_list_lock;
115 struct list_head tag_list;
116};
117
118struct blk_mq_queue_data {
119 struct request *rq;
120 bool last;
121};
122
123typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *,
124 const struct blk_mq_queue_data *);
125typedef void (commit_rqs_fn)(struct blk_mq_hw_ctx *);
126typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *);
127typedef void (put_budget_fn)(struct blk_mq_hw_ctx *);
128typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
129typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
130typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
131typedef int (init_request_fn)(struct blk_mq_tag_set *set, struct request *,
132 unsigned int, unsigned int);
133typedef void (exit_request_fn)(struct blk_mq_tag_set *set, struct request *,
134 unsigned int);
135
136typedef bool (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
137 bool);
138typedef bool (busy_tag_iter_fn)(struct request *, void *, bool);
139typedef int (poll_fn)(struct blk_mq_hw_ctx *);
140typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
141typedef bool (busy_fn)(struct request_queue *);
142typedef void (complete_fn)(struct request *);
143typedef void (cleanup_rq_fn)(struct request *);
144
145
146struct blk_mq_ops {
147
148
149
150 queue_rq_fn *queue_rq;
151
152
153
154
155
156
157
158
159 commit_rqs_fn *commit_rqs;
160
161
162
163
164
165
166
167 get_budget_fn *get_budget;
168 put_budget_fn *put_budget;
169
170
171
172
173 timeout_fn *timeout;
174
175
176
177
178 poll_fn *poll;
179
180 complete_fn *complete;
181
182
183
184
185
186
187 init_hctx_fn *init_hctx;
188 exit_hctx_fn *exit_hctx;
189
190
191
192
193
194
195
196
197
198
199 init_request_fn *init_request;
200 exit_request_fn *exit_request;
201
202 void (*initialize_rq_fn)(struct request *rq);
203
204
205
206
207
208 cleanup_rq_fn *cleanup_rq;
209
210
211
212
213 busy_fn *busy;
214
215 map_queues_fn *map_queues;
216
217#ifdef CONFIG_BLK_DEBUG_FS
218
219
220
221
222 void (*show_rq)(struct seq_file *m, struct request *rq);
223#endif
224};
225
226enum {
227 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
228 BLK_MQ_F_TAG_SHARED = 1 << 1,
229 BLK_MQ_F_BLOCKING = 1 << 5,
230 BLK_MQ_F_NO_SCHED = 1 << 6,
231 BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
232 BLK_MQ_F_ALLOC_POLICY_BITS = 1,
233
234 BLK_MQ_S_STOPPED = 0,
235 BLK_MQ_S_TAG_ACTIVE = 1,
236 BLK_MQ_S_SCHED_RESTART = 2,
237
238 BLK_MQ_MAX_DEPTH = 10240,
239
240 BLK_MQ_CPU_WORK_BATCH = 8,
241};
242#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
243 ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
244 ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
245#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
246 ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
247 << BLK_MQ_F_ALLOC_POLICY_START_BIT)
248
249struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
250struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
251 struct request_queue *q,
252 bool elevator_init);
253struct request_queue *blk_mq_init_sq_queue(struct blk_mq_tag_set *set,
254 const struct blk_mq_ops *ops,
255 unsigned int queue_depth,
256 unsigned int set_flags);
257void blk_mq_unregister_dev(struct device *, struct request_queue *);
258
259int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
260void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
261
262void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
263
264void blk_mq_free_request(struct request *rq);
265bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
266
267bool blk_mq_queue_inflight(struct request_queue *q);
268
269enum {
270
271 BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0),
272
273 BLK_MQ_REQ_RESERVED = (__force blk_mq_req_flags_t)(1 << 1),
274
275 BLK_MQ_REQ_INTERNAL = (__force blk_mq_req_flags_t)(1 << 2),
276
277 BLK_MQ_REQ_PREEMPT = (__force blk_mq_req_flags_t)(1 << 3),
278};
279
280struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,
281 blk_mq_req_flags_t flags);
282struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
283 unsigned int op, blk_mq_req_flags_t flags,
284 unsigned int hctx_idx);
285struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
286
287enum {
288 BLK_MQ_UNIQUE_TAG_BITS = 16,
289 BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
290};
291
292u32 blk_mq_unique_tag(struct request *rq);
293
294static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
295{
296 return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
297}
298
299static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
300{
301 return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
302}
303
304
305int blk_mq_request_started(struct request *rq);
306int blk_mq_request_completed(struct request *rq);
307void blk_mq_start_request(struct request *rq);
308void blk_mq_end_request(struct request *rq, blk_status_t error);
309void __blk_mq_end_request(struct request *rq, blk_status_t error);
310
311void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
312void blk_mq_kick_requeue_list(struct request_queue *q);
313void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
314bool blk_mq_complete_request(struct request *rq);
315bool blk_mq_bio_list_merge(struct request_queue *q, struct list_head *list,
316 struct bio *bio, unsigned int nr_segs);
317bool blk_mq_queue_stopped(struct request_queue *q);
318void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
319void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
320void blk_mq_stop_hw_queues(struct request_queue *q);
321void blk_mq_start_hw_queues(struct request_queue *q);
322void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
323void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
324void blk_mq_quiesce_queue(struct request_queue *q);
325void blk_mq_unquiesce_queue(struct request_queue *q);
326void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
327bool blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
328void blk_mq_run_hw_queues(struct request_queue *q, bool async);
329void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
330 busy_tag_iter_fn *fn, void *priv);
331void blk_mq_tagset_wait_completed_request(struct blk_mq_tag_set *tagset);
332void blk_mq_freeze_queue(struct request_queue *q);
333void blk_mq_unfreeze_queue(struct request_queue *q);
334void blk_freeze_queue_start(struct request_queue *q);
335void blk_mq_freeze_queue_wait(struct request_queue *q);
336int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
337 unsigned long timeout);
338
339int blk_mq_map_queues(struct blk_mq_queue_map *qmap);
340void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
341
342void blk_mq_quiesce_queue_nowait(struct request_queue *q);
343
344unsigned int blk_mq_rq_cpu(struct request *rq);
345
346
347
348
349
350static inline struct request *blk_mq_rq_from_pdu(void *pdu)
351{
352 return pdu - sizeof(struct request);
353}
354static inline void *blk_mq_rq_to_pdu(struct request *rq)
355{
356 return rq + 1;
357}
358
359#define queue_for_each_hw_ctx(q, hctx, i) \
360 for ((i) = 0; (i) < (q)->nr_hw_queues && \
361 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
362
363#define hctx_for_each_ctx(hctx, ctx, i) \
364 for ((i) = 0; (i) < (hctx)->nr_ctx && \
365 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
366
367static inline blk_qc_t request_to_qc_t(struct blk_mq_hw_ctx *hctx,
368 struct request *rq)
369{
370 if (rq->tag != -1)
371 return rq->tag | (hctx->queue_num << BLK_QC_T_SHIFT);
372
373 return rq->internal_tag | (hctx->queue_num << BLK_QC_T_SHIFT) |
374 BLK_QC_T_INTERNAL;
375}
376
377static inline void blk_mq_cleanup_rq(struct request *rq)
378{
379 if (rq->q->mq_ops->cleanup_rq)
380 rq->q->mq_ops->cleanup_rq(rq);
381}
382
383#endif
384