summaryrefslogtreecommitdiff
path: root/block/blk-rq-qos.h
blob: 6e09e98b93eae8630326a73ee78242f8438c918f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
#ifndef RQ_QOS_H
#define RQ_QOS_H

#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/blk_types.h>
#include <linux/atomic.h>
#include <linux/wait.h>

enum rq_qos_id {
	RQ_QOS_WBT,
	RQ_QOS_CGROUP,
};

struct rq_wait {
	wait_queue_head_t wait;
	atomic_t inflight;
};

struct rq_qos {
	struct rq_qos_ops *ops;
	struct request_queue *q;
	enum rq_qos_id id;
	struct rq_qos *next;
};

struct rq_qos_ops {
	void (*throttle)(struct rq_qos *, struct bio *);
	void (*track)(struct rq_qos *, struct request *, struct bio *);
	void (*issue)(struct rq_qos *, struct request *);
	void (*requeue)(struct rq_qos *, struct request *);
	void (*done)(struct rq_qos *, struct request *);
	void (*done_bio)(struct rq_qos *, struct bio *);
	void (*cleanup)(struct rq_qos *, struct bio *);
	void (*exit)(struct rq_qos *);
};

struct rq_depth {
	unsigned int max_depth;

	int scale_step;
	bool scaled_max;

	unsigned int queue_depth;
	unsigned int default_depth;
};

static inline struct rq_qos *rq_qos_id(struct request_queue *q,
				       enum rq_qos_id id)
{
	struct rq_qos *rqos;
	for (rqos = q->rq_qos; rqos; rqos = rqos->next) {
		if (rqos->id == id)
			break;
	}
	return rqos;
}

static inline struct rq_qos *wbt_rq_qos(struct request_queue *q)
{
	return rq_qos_id(q, RQ_QOS_WBT);
}

static inline struct rq_qos *blkcg_rq_qos(struct request_queue *q)
{
	return rq_qos_id(q, RQ_QOS_CGROUP);
}

static inline void rq_wait_init(struct rq_wait *rq_wait)
{
	atomic_set(&rq_wait->inflight, 0);
	init_waitqueue_head(&rq_wait->wait);
}

static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos)
{
	rqos->next = q->rq_qos;
	q->rq_qos = rqos;
}

static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos)
{
	struct rq_qos *cur, *prev = NULL;
	for (cur = q->rq_qos; cur; cur = cur->next) {
		if (cur == rqos) {
			if (prev)
				prev->next = rqos->next;
			else
				q->rq_qos = cur;
			break;
		}
		prev = cur;
	}
}

bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit);
void rq_depth_scale_up(struct rq_depth *rqd);
void rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);
bool rq_depth_calc_max_depth(struct rq_depth *rqd);

void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio);
void __rq_qos_done(struct rq_qos *rqos, struct request *rq);
void __rq_qos_issue(struct rq_qos *rqos, struct request *rq);
void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq);
void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio);
void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio);
void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio);

static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio)
{
	if (q->rq_qos)
		__rq_qos_cleanup(q->rq_qos, bio);
}

static inline void rq_qos_done(struct request_queue *q, struct request *rq)
{
	if (q->rq_qos)
		__rq_qos_done(q->rq_qos, rq);
}

static inline void rq_qos_issue(struct request_queue *q, struct request *rq)
{
	if (q->rq_qos)
		__rq_qos_issue(q->rq_qos, rq);
}

static inline void rq_qos_requeue(struct request_queue *q, struct request *rq)
{
	if (q->rq_qos)
		__rq_qos_requeue(q->rq_qos, rq);
}

static inline void rq_qos_done_bio(struct request_queue *q, struct bio *bio)
{
	if (q->rq_qos)
		__rq_qos_done_bio(q->rq_qos, bio);
}

static inline void rq_qos_throttle(struct request_queue *q, struct bio *bio)
{
	if (q->rq_qos)
		__rq_qos_throttle(q->rq_qos, bio);
}

static inline void rq_qos_track(struct request_queue *q, struct request *rq,
				struct bio *bio)
{
	if (q->rq_qos)
		__rq_qos_track(q->rq_qos, rq, bio);
}

void rq_qos_exit(struct request_queue *);

#endif