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