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1 | #ifndef RQ_QOS_H |
2 | #define RQ_QOS_H | |
3 | ||
4 | #include <linux/kernel.h> | |
5 | #include <linux/blkdev.h> | |
6 | #include <linux/blk_types.h> | |
7 | #include <linux/atomic.h> | |
8 | #include <linux/wait.h> | |
9 | ||
10 | enum rq_qos_id { | |
11 | RQ_QOS_WBT, | |
12 | RQ_QOS_CGROUP, | |
13 | }; | |
14 | ||
15 | struct rq_wait { | |
16 | wait_queue_head_t wait; | |
17 | atomic_t inflight; | |
18 | }; | |
19 | ||
20 | struct rq_qos { | |
21 | struct rq_qos_ops *ops; | |
22 | struct request_queue *q; | |
23 | enum rq_qos_id id; | |
24 | struct rq_qos *next; | |
25 | }; | |
26 | ||
27 | struct rq_qos_ops { | |
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28 | void (*throttle)(struct rq_qos *, struct bio *, spinlock_t *); |
29 | void (*track)(struct rq_qos *, struct request *, struct bio *); | |
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30 | void (*issue)(struct rq_qos *, struct request *); |
31 | void (*requeue)(struct rq_qos *, struct request *); | |
32 | void (*done)(struct rq_qos *, struct request *); | |
67b42d0b | 33 | void (*done_bio)(struct rq_qos *, struct bio *); |
c1c80384 | 34 | void (*cleanup)(struct rq_qos *, struct bio *); |
a7905043 JB |
35 | void (*exit)(struct rq_qos *); |
36 | }; | |
37 | ||
38 | struct rq_depth { | |
39 | unsigned int max_depth; | |
40 | ||
41 | int scale_step; | |
42 | bool scaled_max; | |
43 | ||
44 | unsigned int queue_depth; | |
45 | unsigned int default_depth; | |
46 | }; | |
47 | ||
48 | static inline struct rq_qos *rq_qos_id(struct request_queue *q, | |
49 | enum rq_qos_id id) | |
50 | { | |
51 | struct rq_qos *rqos; | |
52 | for (rqos = q->rq_qos; rqos; rqos = rqos->next) { | |
53 | if (rqos->id == id) | |
54 | break; | |
55 | } | |
56 | return rqos; | |
57 | } | |
58 | ||
59 | static inline struct rq_qos *wbt_rq_qos(struct request_queue *q) | |
60 | { | |
61 | return rq_qos_id(q, RQ_QOS_WBT); | |
62 | } | |
63 | ||
64 | static inline struct rq_qos *blkcg_rq_qos(struct request_queue *q) | |
65 | { | |
66 | return rq_qos_id(q, RQ_QOS_CGROUP); | |
67 | } | |
68 | ||
69 | static inline void rq_wait_init(struct rq_wait *rq_wait) | |
70 | { | |
71 | atomic_set(&rq_wait->inflight, 0); | |
72 | init_waitqueue_head(&rq_wait->wait); | |
73 | } | |
74 | ||
75 | static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos) | |
76 | { | |
77 | rqos->next = q->rq_qos; | |
78 | q->rq_qos = rqos; | |
79 | } | |
80 | ||
81 | static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos) | |
82 | { | |
83 | struct rq_qos *cur, *prev = NULL; | |
84 | for (cur = q->rq_qos; cur; cur = cur->next) { | |
85 | if (cur == rqos) { | |
86 | if (prev) | |
87 | prev->next = rqos->next; | |
88 | else | |
89 | q->rq_qos = cur; | |
90 | break; | |
91 | } | |
92 | prev = cur; | |
93 | } | |
94 | } | |
95 | ||
22f17952 | 96 | bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit); |
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97 | void rq_depth_scale_up(struct rq_depth *rqd); |
98 | void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle); | |
99 | bool rq_depth_calc_max_depth(struct rq_depth *rqd); | |
100 | ||
c1c80384 | 101 | void rq_qos_cleanup(struct request_queue *, struct bio *); |
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102 | void rq_qos_done(struct request_queue *, struct request *); |
103 | void rq_qos_issue(struct request_queue *, struct request *); | |
104 | void rq_qos_requeue(struct request_queue *, struct request *); | |
67b42d0b | 105 | void rq_qos_done_bio(struct request_queue *q, struct bio *bio); |
c1c80384 JB |
106 | void rq_qos_throttle(struct request_queue *, struct bio *, spinlock_t *); |
107 | void rq_qos_track(struct request_queue *q, struct request *, struct bio *); | |
a7905043 JB |
108 | void rq_qos_exit(struct request_queue *); |
109 | #endif |