1#ifndef BLK_MQ_H
2#define BLK_MQ_H
3
4#include <linux/blkdev.h>
5
6struct blk_mq_tags;
7struct blk_flush_queue;
8
9struct blk_mq_cpu_notifier {
10 struct list_head list;
11 void *data;
12 int (*notify)(void *data, unsigned long action, unsigned int cpu);
13};
14
15struct blk_mq_ctxmap {
16 unsigned int size;
17 unsigned int bits_per_word;
18 struct blk_align_bitmap *map;
19};
20
21struct blk_mq_hw_ctx {
22 struct {
23 spinlock_t lock;
24 struct list_head dispatch;
25 } ____cacheline_aligned_in_smp;
26
27 unsigned long state;
28 struct delayed_work run_work;
29 struct delayed_work delay_work;
30 cpumask_var_t cpumask;
31 int next_cpu;
32 int next_cpu_batch;
33
34 unsigned long flags;
35
36 struct request_queue *queue;
37 struct blk_flush_queue *fq;
38
39 void *driver_data;
40
41 struct blk_mq_ctxmap ctx_map;
42
43 unsigned int nr_ctx;
44 struct blk_mq_ctx **ctxs;
45
46 atomic_t wait_index;
47
48 struct blk_mq_tags *tags;
49
50 unsigned long queued;
51 unsigned long run;
52#define BLK_MQ_MAX_DISPATCH_ORDER 10
53 unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
54
55 unsigned int numa_node;
56 unsigned int queue_num;
57
58 atomic_t nr_active;
59
60 struct blk_mq_cpu_notifier cpu_notifier;
61 struct kobject kobj;
62};
63
64struct blk_mq_tag_set {
65 struct blk_mq_ops *ops;
66 unsigned int nr_hw_queues;
67 unsigned int queue_depth;
68 unsigned int reserved_tags;
69 unsigned int cmd_size;
70 int numa_node;
71 unsigned int timeout;
72 unsigned int flags;
73 void *driver_data;
74
75 struct blk_mq_tags **tags;
76
77 struct mutex tag_list_lock;
78 struct list_head tag_list;
79};
80
81struct blk_mq_queue_data {
82 struct request *rq;
83 struct list_head *list;
84 bool last;
85};
86
87typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *);
88typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
89typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
90typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
91typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
92typedef int (init_request_fn)(void *, struct request *, unsigned int,
93 unsigned int, unsigned int);
94typedef void (exit_request_fn)(void *, struct request *, unsigned int,
95 unsigned int);
96
97typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
98 bool);
99typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
100
101struct blk_mq_ops {
102
103
104
105 queue_rq_fn *queue_rq;
106
107
108
109
110 map_queue_fn *map_queue;
111
112
113
114
115 timeout_fn *timeout;
116
117 softirq_done_fn *complete;
118
119
120
121
122
123
124 init_hctx_fn *init_hctx;
125 exit_hctx_fn *exit_hctx;
126
127
128
129
130
131
132
133
134
135
136 init_request_fn *init_request;
137 exit_request_fn *exit_request;
138};
139
140enum {
141 BLK_MQ_RQ_QUEUE_OK = 0,
142 BLK_MQ_RQ_QUEUE_BUSY = 1,
143 BLK_MQ_RQ_QUEUE_ERROR = 2,
144
145 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
146 BLK_MQ_F_TAG_SHARED = 1 << 1,
147 BLK_MQ_F_SG_MERGE = 1 << 2,
148 BLK_MQ_F_DEFER_ISSUE = 1 << 4,
149 BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
150 BLK_MQ_F_ALLOC_POLICY_BITS = 1,
151
152 BLK_MQ_S_STOPPED = 0,
153 BLK_MQ_S_TAG_ACTIVE = 1,
154
155 BLK_MQ_MAX_DEPTH = 10240,
156
157 BLK_MQ_CPU_WORK_BATCH = 8,
158};
159#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
160 ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
161 ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
162#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
163 ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
164 << BLK_MQ_F_ALLOC_POLICY_START_BIT)
165
166struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
167struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
168 struct request_queue *q);
169void blk_mq_finish_init(struct request_queue *q);
170int blk_mq_register_disk(struct gendisk *);
171void blk_mq_unregister_disk(struct gendisk *);
172
173int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
174void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
175
176void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
177
178void blk_mq_insert_request(struct request *, bool, bool, bool);
179void blk_mq_free_request(struct request *rq);
180void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *, struct request *rq);
181bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
182struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
183 gfp_t gfp, bool reserved);
184struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
185struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags);
186
187enum {
188 BLK_MQ_UNIQUE_TAG_BITS = 16,
189 BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
190};
191
192u32 blk_mq_unique_tag(struct request *rq);
193
194static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
195{
196 return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
197}
198
199static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
200{
201 return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
202}
203
204struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
205struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);
206
207int blk_mq_request_started(struct request *rq);
208void blk_mq_start_request(struct request *rq);
209void blk_mq_end_request(struct request *rq, int error);
210void __blk_mq_end_request(struct request *rq, int error);
211
212void blk_mq_requeue_request(struct request *rq);
213void blk_mq_add_to_requeue_list(struct request *rq, bool at_head);
214void blk_mq_cancel_requeue_work(struct request_queue *q);
215void blk_mq_kick_requeue_list(struct request_queue *q);
216void blk_mq_abort_requeue_list(struct request_queue *q);
217void blk_mq_complete_request(struct request *rq, int error);
218
219void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
220void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
221void blk_mq_stop_hw_queues(struct request_queue *q);
222void blk_mq_start_hw_queues(struct request_queue *q);
223void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
224void blk_mq_run_hw_queues(struct request_queue *q, bool async);
225void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
226void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
227 void *priv);
228void blk_mq_freeze_queue(struct request_queue *q);
229void blk_mq_unfreeze_queue(struct request_queue *q);
230void blk_mq_freeze_queue_start(struct request_queue *q);
231
232
233
234
235
236static inline struct request *blk_mq_rq_from_pdu(void *pdu)
237{
238 return pdu - sizeof(struct request);
239}
240static inline void *blk_mq_rq_to_pdu(struct request *rq)
241{
242 return rq + 1;
243}
244
245#define queue_for_each_hw_ctx(q, hctx, i) \
246 for ((i) = 0; (i) < (q)->nr_hw_queues && \
247 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
248
249#define queue_for_each_ctx(q, ctx, i) \
250 for ((i) = 0; (i) < (q)->nr_queues && \
251 ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
252
253#define hctx_for_each_ctx(hctx, ctx, i) \
254 for ((i) = 0; (i) < (hctx)->nr_ctx && \
255 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
256
257#define blk_ctx_sum(q, sum) \
258({ \
259 struct blk_mq_ctx *__x; \
260 unsigned int __ret = 0, __i; \
261 \
262 queue_for_each_ctx((q), __x, __i) \
263 __ret += sum; \
264 __ret; \
265})
266
267#endif
268