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a7905043 JB |
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 { | |
d5337560 | 28 | void (*throttle)(struct rq_qos *, struct bio *); |
c1c80384 | 29 | void (*track)(struct rq_qos *, struct request *, struct bio *); |
a7905043 JB |
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 | ||
84f60324 JB |
96 | typedef bool (acquire_inflight_cb_t)(struct rq_wait *rqw, void *private_data); |
97 | typedef void (cleanup_cb_t)(struct rq_wait *rqw, void *private_data); | |
98 | ||
99 | void rq_qos_wait(struct rq_wait *rqw, void *private_data, | |
100 | acquire_inflight_cb_t *acquire_inflight_cb, | |
101 | cleanup_cb_t *cleanup_cb); | |
22f17952 | 102 | bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit); |
a7905043 JB |
103 | void rq_depth_scale_up(struct rq_depth *rqd); |
104 | void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle); | |
105 | bool rq_depth_calc_max_depth(struct rq_depth *rqd); | |
106 | ||
e5045454 JA |
107 | void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio); |
108 | void __rq_qos_done(struct rq_qos *rqos, struct request *rq); | |
109 | void __rq_qos_issue(struct rq_qos *rqos, struct request *rq); | |
110 | void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq); | |
111 | void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio); | |
112 | void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio); | |
113 | void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio); | |
114 | ||
115 | static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio) | |
116 | { | |
117 | if (q->rq_qos) | |
118 | __rq_qos_cleanup(q->rq_qos, bio); | |
119 | } | |
120 | ||
121 | static inline void rq_qos_done(struct request_queue *q, struct request *rq) | |
122 | { | |
123 | if (q->rq_qos) | |
124 | __rq_qos_done(q->rq_qos, rq); | |
125 | } | |
126 | ||
127 | static inline void rq_qos_issue(struct request_queue *q, struct request *rq) | |
128 | { | |
129 | if (q->rq_qos) | |
130 | __rq_qos_issue(q->rq_qos, rq); | |
131 | } | |
132 | ||
133 | static inline void rq_qos_requeue(struct request_queue *q, struct request *rq) | |
134 | { | |
135 | if (q->rq_qos) | |
136 | __rq_qos_requeue(q->rq_qos, rq); | |
137 | } | |
138 | ||
139 | static inline void rq_qos_done_bio(struct request_queue *q, struct bio *bio) | |
140 | { | |
141 | if (q->rq_qos) | |
142 | __rq_qos_done_bio(q->rq_qos, bio); | |
143 | } | |
144 | ||
145 | static inline void rq_qos_throttle(struct request_queue *q, struct bio *bio) | |
146 | { | |
147 | if (q->rq_qos) | |
148 | __rq_qos_throttle(q->rq_qos, bio); | |
149 | } | |
150 | ||
151 | static inline void rq_qos_track(struct request_queue *q, struct request *rq, | |
152 | struct bio *bio) | |
153 | { | |
154 | if (q->rq_qos) | |
155 | __rq_qos_track(q->rq_qos, rq, bio); | |
156 | } | |
157 | ||
a7905043 | 158 | void rq_qos_exit(struct request_queue *); |
e5045454 | 159 | |
a7905043 | 160 | #endif |