Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 : #ifndef RQ_QOS_H
3 : #define RQ_QOS_H
4 :
5 : #include <linux/kernel.h>
6 : #include <linux/blkdev.h>
7 : #include <linux/blk_types.h>
8 : #include <linux/atomic.h>
9 : #include <linux/wait.h>
10 : #include <linux/blk-mq.h>
11 :
12 : #include "blk-mq-debugfs.h"
13 :
14 : struct blk_mq_debugfs_attr;
15 :
16 : enum rq_qos_id {
17 : RQ_QOS_WBT,
18 : RQ_QOS_LATENCY,
19 : RQ_QOS_COST,
20 : };
21 :
22 : struct rq_wait {
23 : wait_queue_head_t wait;
24 : atomic_t inflight;
25 : };
26 :
27 : struct rq_qos {
28 : const struct rq_qos_ops *ops;
29 : struct gendisk *disk;
30 : enum rq_qos_id id;
31 : struct rq_qos *next;
32 : #ifdef CONFIG_BLK_DEBUG_FS
33 : struct dentry *debugfs_dir;
34 : #endif
35 : };
36 :
37 : struct rq_qos_ops {
38 : void (*throttle)(struct rq_qos *, struct bio *);
39 : void (*track)(struct rq_qos *, struct request *, struct bio *);
40 : void (*merge)(struct rq_qos *, struct request *, struct bio *);
41 : void (*issue)(struct rq_qos *, struct request *);
42 : void (*requeue)(struct rq_qos *, struct request *);
43 : void (*done)(struct rq_qos *, struct request *);
44 : void (*done_bio)(struct rq_qos *, struct bio *);
45 : void (*cleanup)(struct rq_qos *, struct bio *);
46 : void (*queue_depth_changed)(struct rq_qos *);
47 : void (*exit)(struct rq_qos *);
48 : const struct blk_mq_debugfs_attr *debugfs_attrs;
49 : };
50 :
51 : struct rq_depth {
52 : unsigned int max_depth;
53 :
54 : int scale_step;
55 : bool scaled_max;
56 :
57 : unsigned int queue_depth;
58 : unsigned int default_depth;
59 : };
60 :
61 : static inline struct rq_qos *rq_qos_id(struct request_queue *q,
62 : enum rq_qos_id id)
63 : {
64 : struct rq_qos *rqos;
65 0 : for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
66 0 : if (rqos->id == id)
67 : break;
68 : }
69 : return rqos;
70 : }
71 :
72 : static inline struct rq_qos *wbt_rq_qos(struct request_queue *q)
73 : {
74 : return rq_qos_id(q, RQ_QOS_WBT);
75 : }
76 :
77 : static inline struct rq_qos *iolat_rq_qos(struct request_queue *q)
78 : {
79 : return rq_qos_id(q, RQ_QOS_LATENCY);
80 : }
81 :
82 : static inline void rq_wait_init(struct rq_wait *rq_wait)
83 : {
84 : atomic_set(&rq_wait->inflight, 0);
85 : init_waitqueue_head(&rq_wait->wait);
86 : }
87 :
88 : int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,
89 : const struct rq_qos_ops *ops);
90 : void rq_qos_del(struct rq_qos *rqos);
91 :
92 : typedef bool (acquire_inflight_cb_t)(struct rq_wait *rqw, void *private_data);
93 : typedef void (cleanup_cb_t)(struct rq_wait *rqw, void *private_data);
94 :
95 : void rq_qos_wait(struct rq_wait *rqw, void *private_data,
96 : acquire_inflight_cb_t *acquire_inflight_cb,
97 : cleanup_cb_t *cleanup_cb);
98 : bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit);
99 : bool rq_depth_scale_up(struct rq_depth *rqd);
100 : bool rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);
101 : bool rq_depth_calc_max_depth(struct rq_depth *rqd);
102 :
103 : void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio);
104 : void __rq_qos_done(struct rq_qos *rqos, struct request *rq);
105 : void __rq_qos_issue(struct rq_qos *rqos, struct request *rq);
106 : void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq);
107 : void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio);
108 : void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio);
109 : void __rq_qos_merge(struct rq_qos *rqos, struct request *rq, struct bio *bio);
110 : void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio);
111 : void __rq_qos_queue_depth_changed(struct rq_qos *rqos);
112 :
113 : static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio)
114 : {
115 0 : if (q->rq_qos)
116 0 : __rq_qos_cleanup(q->rq_qos, bio);
117 : }
118 :
119 : static inline void rq_qos_done(struct request_queue *q, struct request *rq)
120 : {
121 0 : if (q->rq_qos)
122 0 : __rq_qos_done(q->rq_qos, rq);
123 : }
124 :
125 : static inline void rq_qos_issue(struct request_queue *q, struct request *rq)
126 : {
127 0 : if (q->rq_qos)
128 0 : __rq_qos_issue(q->rq_qos, rq);
129 : }
130 :
131 : static inline void rq_qos_requeue(struct request_queue *q, struct request *rq)
132 : {
133 0 : if (q->rq_qos)
134 0 : __rq_qos_requeue(q->rq_qos, rq);
135 : }
136 :
137 0 : static inline void rq_qos_done_bio(struct bio *bio)
138 : {
139 0 : if (bio->bi_bdev && (bio_flagged(bio, BIO_QOS_THROTTLED) ||
140 0 : bio_flagged(bio, BIO_QOS_MERGED))) {
141 0 : struct request_queue *q = bdev_get_queue(bio->bi_bdev);
142 0 : if (q->rq_qos)
143 0 : __rq_qos_done_bio(q->rq_qos, bio);
144 : }
145 0 : }
146 :
147 : static inline void rq_qos_throttle(struct request_queue *q, struct bio *bio)
148 : {
149 0 : if (q->rq_qos) {
150 0 : bio_set_flag(bio, BIO_QOS_THROTTLED);
151 0 : __rq_qos_throttle(q->rq_qos, bio);
152 : }
153 : }
154 :
155 : static inline void rq_qos_track(struct request_queue *q, struct request *rq,
156 : struct bio *bio)
157 : {
158 0 : if (q->rq_qos)
159 0 : __rq_qos_track(q->rq_qos, rq, bio);
160 : }
161 :
162 : static inline void rq_qos_merge(struct request_queue *q, struct request *rq,
163 : struct bio *bio)
164 : {
165 0 : if (q->rq_qos) {
166 0 : bio_set_flag(bio, BIO_QOS_MERGED);
167 0 : __rq_qos_merge(q->rq_qos, rq, bio);
168 : }
169 : }
170 :
171 : static inline void rq_qos_queue_depth_changed(struct request_queue *q)
172 : {
173 0 : if (q->rq_qos)
174 0 : __rq_qos_queue_depth_changed(q->rq_qos);
175 : }
176 :
177 : void rq_qos_exit(struct request_queue *);
178 :
179 : #endif
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