1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright 2021 Google LLC
4 * Author: Daeho Jeong <daehojeong@google.com>
5 */
6#ifndef __F2FS_IOSTAT_H__
7#define __F2FS_IOSTAT_H__
8
9struct bio_post_read_ctx;
10
11enum iostat_lat_type {
12	READ_IO = 0,
13	WRITE_SYNC_IO,
14	WRITE_ASYNC_IO,
15	MAX_IO_TYPE,
16};
17
18#ifdef CONFIG_F2FS_IOSTAT
19
20#define NUM_PREALLOC_IOSTAT_CTXS	128
21#define DEFAULT_IOSTAT_PERIOD_MS	3000
22#define MIN_IOSTAT_PERIOD_MS		100
23/* maximum period of iostat tracing is 1 day */
24#define MAX_IOSTAT_PERIOD_MS		8640000
25
26struct iostat_lat_info {
27	unsigned long sum_lat[MAX_IO_TYPE][NR_PAGE_TYPE];	/* sum of io latencies */
28	unsigned long peak_lat[MAX_IO_TYPE][NR_PAGE_TYPE];	/* peak io latency */
29	unsigned int bio_cnt[MAX_IO_TYPE][NR_PAGE_TYPE];	/* bio count */
30};
31
32extern int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
33			void *offset);
34extern void f2fs_reset_iostat(struct f2fs_sb_info *sbi);
35extern void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
36			enum iostat_type type, unsigned long long io_bytes);
37
38struct bio_iostat_ctx {
39	struct f2fs_sb_info *sbi;
40	unsigned long submit_ts;
41	enum page_type type;
42	struct bio_post_read_ctx *post_read_ctx;
43};
44
45static inline void iostat_update_submit_ctx(struct bio *bio,
46			enum page_type type)
47{
48	struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
49
50	iostat_ctx->submit_ts = jiffies;
51	iostat_ctx->type = type;
52}
53
54static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
55{
56	struct bio_iostat_ctx *iostat_ctx = bio->bi_private;
57
58	return iostat_ctx->post_read_ctx;
59}
60
61extern void iostat_update_and_unbind_ctx(struct bio *bio);
62extern void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
63		struct bio *bio, struct bio_post_read_ctx *ctx);
64extern int f2fs_init_iostat_processing(void);
65extern void f2fs_destroy_iostat_processing(void);
66extern int f2fs_init_iostat(struct f2fs_sb_info *sbi);
67extern void f2fs_destroy_iostat(struct f2fs_sb_info *sbi);
68#else
69static inline void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
70		enum iostat_type type, unsigned long long io_bytes) {}
71static inline void iostat_update_and_unbind_ctx(struct bio *bio) {}
72static inline void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
73		struct bio *bio, struct bio_post_read_ctx *ctx) {}
74static inline void iostat_update_submit_ctx(struct bio *bio,
75		enum page_type type) {}
76static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
77{
78	return bio->bi_private;
79}
80static inline int f2fs_init_iostat_processing(void) { return 0; }
81static inline void f2fs_destroy_iostat_processing(void) {}
82static inline int f2fs_init_iostat(struct f2fs_sb_info *sbi) { return 0; }
83static inline void f2fs_destroy_iostat(struct f2fs_sb_info *sbi) {}
84#endif
85#endif /* __F2FS_IOSTAT_H__ */
86