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 
9 struct bio_post_read_ctx;
10 
11 enum 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 
26 struct 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 
32 extern int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
33 			void *offset);
34 extern void f2fs_reset_iostat(struct f2fs_sb_info *sbi);
35 extern void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
36 			enum iostat_type type, unsigned long long io_bytes);
37 
38 struct 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 
iostat_update_submit_ctx(struct bio * bio,enum page_type type)45 static 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 
get_post_read_ctx(struct bio * bio)54 static 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 
61 extern void iostat_update_and_unbind_ctx(struct bio *bio);
62 extern void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
63 		struct bio *bio, struct bio_post_read_ctx *ctx);
64 extern int f2fs_init_iostat_processing(void);
65 extern void f2fs_destroy_iostat_processing(void);
66 extern int f2fs_init_iostat(struct f2fs_sb_info *sbi);
67 extern void f2fs_destroy_iostat(struct f2fs_sb_info *sbi);
68 #else
f2fs_update_iostat(struct f2fs_sb_info * sbi,struct inode * inode,enum iostat_type type,unsigned long long io_bytes)69 static inline void f2fs_update_iostat(struct f2fs_sb_info *sbi, struct inode *inode,
70 		enum iostat_type type, unsigned long long io_bytes) {}
iostat_update_and_unbind_ctx(struct bio * bio)71 static inline void iostat_update_and_unbind_ctx(struct bio *bio) {}
iostat_alloc_and_bind_ctx(struct f2fs_sb_info * sbi,struct bio * bio,struct bio_post_read_ctx * ctx)72 static inline void iostat_alloc_and_bind_ctx(struct f2fs_sb_info *sbi,
73 		struct bio *bio, struct bio_post_read_ctx *ctx) {}
iostat_update_submit_ctx(struct bio * bio,enum page_type type)74 static inline void iostat_update_submit_ctx(struct bio *bio,
75 		enum page_type type) {}
get_post_read_ctx(struct bio * bio)76 static inline struct bio_post_read_ctx *get_post_read_ctx(struct bio *bio)
77 {
78 	return bio->bi_private;
79 }
f2fs_init_iostat_processing(void)80 static inline int f2fs_init_iostat_processing(void) { return 0; }
f2fs_destroy_iostat_processing(void)81 static inline void f2fs_destroy_iostat_processing(void) {}
f2fs_init_iostat(struct f2fs_sb_info * sbi)82 static inline int f2fs_init_iostat(struct f2fs_sb_info *sbi) { return 0; }
f2fs_destroy_iostat(struct f2fs_sb_info * sbi)83 static inline void f2fs_destroy_iostat(struct f2fs_sb_info *sbi) {}
84 #endif
85 #endif /* __F2FS_IOSTAT_H__ */
86