1#ifndef BLK_MQ_H
2#define BLK_MQ_H
3
4#include <linux/blkdev.h>
5#include <linux/rh_kabi.h>
6
7struct blk_mq_tags;
8struct blk_flush_queue;
9
10struct blk_mq_cpu_notifier {
11 struct list_head list;
12 void *data;
13 RH_KABI_REPLACE(void (*notify)(void *data, unsigned long action, unsigned int cpu),
14 int (*notify)(void *data, unsigned long action, unsigned int cpu))
15};
16
17struct blk_mq_ctxmap {
18 unsigned int map_size;
19 unsigned int bits_per_word;
20 struct blk_align_bitmap *map;
21};
22
23struct blk_mq_hw_ctx {
24 struct {
25 spinlock_t lock;
26 struct list_head dispatch;
27 } ____cacheline_aligned_in_smp;
28
29 unsigned long state;
30
31 RH_KABI_REPLACE(struct delayed_work delayed_work,
32 struct delayed_work delay_work)
33
34 unsigned long flags;
35
36 struct request_queue *queue;
37 unsigned int queue_num;
38
39 void *driver_data;
40
41 unsigned int nr_ctx;
42 struct blk_mq_ctx **ctxs;
43
44 RH_KABI_REPLACE(unsigned int nr_ctx_map,
45 atomic_t wait_index)
46
47 RH_KABI_REPLACE(unsigned long *ctx_map,
48 unsigned long *padding1)
49
50 RH_KABI_REPLACE(struct request **rqs,
51 struct request **padding2)
52
53 RH_KABI_REPLACE(struct list_head page_list,
54 struct list_head padding3)
55
56 struct blk_mq_tags *tags;
57
58 unsigned long queued;
59 unsigned long run;
60#define BLK_MQ_MAX_DISPATCH_ORDER 10
61 unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
62
63 unsigned int queue_depth;
64 unsigned int numa_node;
65 RH_KABI_DEPRECATE(unsigned int, cmd_size)
66
67 struct blk_mq_cpu_notifier cpu_notifier;
68 struct kobject kobj;
69
70 RH_KABI_EXTEND(struct delayed_work run_work)
71 RH_KABI_EXTEND(cpumask_var_t cpumask)
72 RH_KABI_EXTEND(int next_cpu)
73 RH_KABI_EXTEND(int next_cpu_batch)
74
75 RH_KABI_EXTEND(struct blk_mq_ctxmap ctx_map)
76
77 RH_KABI_EXTEND(atomic_t nr_active)
78
79 RH_KABI_EXTEND(struct blk_flush_queue *fq)
80 RH_KABI_EXTEND(struct srcu_struct queue_rq_srcu)
81};
82
83#ifdef __GENKSYMS__
84struct blk_mq_reg {
85 struct blk_mq_ops *ops;
86 unsigned int nr_hw_queues;
87 unsigned int queue_depth;
88 unsigned int reserved_tags;
89 unsigned int cmd_size;
90 int numa_node;
91 unsigned int timeout;
92 unsigned int flags;
93};
94#else
95struct blk_mq_tag_set {
96 struct blk_mq_ops *ops;
97 unsigned int nr_hw_queues;
98 unsigned int queue_depth;
99 unsigned int reserved_tags;
100 unsigned int cmd_size;
101 int numa_node;
102 unsigned int timeout;
103 unsigned int flags;
104 void *driver_data;
105
106 struct blk_mq_tags **tags;
107
108 struct mutex tag_list_lock;
109 struct list_head tag_list;
110 unsigned int *mq_map;
111};
112#endif
113
114struct blk_mq_queue_data {
115 struct request *rq;
116 struct list_head *list;
117 bool last;
118};
119
120
121#ifdef __GENKSYMS__
122typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *);
123#else
124typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *);
125#endif
126
127typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
128#ifdef __GENKSYMS__
129typedef struct blk_mq_hw_ctx *(alloc_hctx_fn)(struct blk_mq_reg *,unsigned int);
130typedef void (free_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
131#endif
132typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
133typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
134typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
135typedef int (init_request_fn)(void *, struct request *, unsigned int,
136 unsigned int, unsigned int);
137typedef void (exit_request_fn)(void *, struct request *, unsigned int,
138 unsigned int);
139typedef int (reinit_request_fn)(void *, struct request *);
140
141typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
142 bool);
143typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
144typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
145
146struct blk_mq_ops {
147
148
149
150 queue_rq_fn *queue_rq;
151
152
153
154
155 map_queue_fn *map_queue;
156
157
158
159
160 RH_KABI_REPLACE(rq_timed_out_fn *timeout, timeout_fn *timeout)
161
162 softirq_done_fn *complete;
163
164#ifdef __GENKSYMS__
165
166
167
168
169 alloc_hctx_fn *alloc_hctx;
170 free_hctx_fn *free_hctx;
171#else
172
173
174
175
176
177
178
179
180
181 init_request_fn *init_request;
182 exit_request_fn *exit_request;
183 reinit_request_fn *reinit_request;
184
185 map_queues_fn *map_queues;
186#endif
187
188
189
190
191
192
193 init_hctx_fn *init_hctx;
194 exit_hctx_fn *exit_hctx;
195};
196
197enum {
198 BLK_MQ_RQ_QUEUE_OK = 0,
199 BLK_MQ_RQ_QUEUE_BUSY = 1,
200 BLK_MQ_RQ_QUEUE_ERROR = 2,
201
202 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
203 BLK_MQ_F_SHOULD_SORT = 1 << 1,
204 BLK_MQ_F_TAG_SHARED = 1 << 2,
205 BLK_MQ_F_SG_MERGE = 1 << 3,
206 BLK_MQ_F_DEFER_ISSUE = 1 << 5,
207 BLK_MQ_F_BLOCKING = 1 << 6,
208
209 BLK_MQ_S_STOPPED = 0,
210 BLK_MQ_S_TAG_ACTIVE = 1,
211
212 BLK_MQ_MAX_DEPTH = 10240,
213
214 BLK_MQ_CPU_WORK_BATCH = 8,
215};
216
217struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
218struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
219 struct request_queue *q);
220int blk_mq_register_disk(struct gendisk *);
221void blk_mq_unregister_disk(struct gendisk *);
222
223int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
224void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
225
226void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
227
228void blk_mq_insert_request(struct request *, bool, bool, bool);
229void blk_mq_free_request(struct request *rq);
230void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *, struct request *rq);
231bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
232
233enum {
234 BLK_MQ_REQ_NOWAIT = (1 << 0),
235 BLK_MQ_REQ_RESERVED = (1 << 1),
236};
237
238struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
239 unsigned int flags);
240struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int op,
241 unsigned int flags, unsigned int hctx_idx);
242struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
243struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags);
244
245enum {
246 BLK_MQ_UNIQUE_TAG_BITS = 16,
247 BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
248};
249
250u32 blk_mq_unique_tag(struct request *rq);
251
252static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
253{
254 return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
255}
256
257static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
258{
259 return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
260}
261
262struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
263struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);
264
265int blk_mq_request_started(struct request *rq);
266void blk_mq_start_request(struct request *rq);
267void blk_mq_end_request(struct request *rq, int error);
268void __blk_mq_end_request(struct request *rq, int error);
269
270void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
271void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
272 bool kick_requeue_list);
273void blk_mq_kick_requeue_list(struct request_queue *q);
274void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
275void blk_mq_complete_request(struct request *rq, int error);
276
277bool blk_mq_queue_stopped(struct request_queue *q);
278void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
279void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
280void blk_mq_stop_hw_queues(struct request_queue *q);
281void blk_mq_start_hw_queues(struct request_queue *q);
282void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
283void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
284void blk_mq_run_hw_queues(struct request_queue *q, bool async);
285void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
286void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
287 busy_tag_iter_fn *fn, void *priv);
288void blk_mq_freeze_queue(struct request_queue *q);
289void blk_mq_unfreeze_queue(struct request_queue *q);
290void blk_freeze_queue_start(struct request_queue *q);
291void blk_mq_freeze_queue_wait(struct request_queue *q);
292int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
293 unsigned long timeout);
294int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
295
296void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
297
298
299
300
301
302static inline struct request *blk_mq_rq_from_pdu(void *pdu)
303{
304 return pdu - sizeof(struct request);
305}
306static inline void *blk_mq_rq_to_pdu(struct request *rq)
307{
308 return (void *) rq + sizeof(*rq);
309}
310
311#define queue_for_each_hw_ctx(q, hctx, i) \
312 for ((i) = 0; (i) < (q)->nr_hw_queues && \
313 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
314
315#define hctx_for_each_ctx(hctx, ctx, i) \
316 for ((i) = 0; (i) < (hctx)->nr_ctx && \
317 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
318
319#endif
320