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Commit | Line | Data |
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9504504c SR |
1 | #ifndef _LINUX_TRACE_SEQ_H |
2 | #define _LINUX_TRACE_SEQ_H | |
3 | ||
6d723736 SR |
4 | #include <linux/fs.h> |
5 | ||
78be6914 WZ |
6 | #include <asm/page.h> |
7 | ||
9504504c SR |
8 | /* |
9 | * Trace sequences are used to allow a function to call several other functions | |
6d3f1e12 | 10 | * to create a string of data to use (up to a max of PAGE_SIZE). |
9504504c SR |
11 | */ |
12 | ||
13 | struct trace_seq { | |
14 | unsigned char buffer[PAGE_SIZE]; | |
15 | unsigned int len; | |
16 | unsigned int readpos; | |
d184b31c | 17 | int full; |
9504504c SR |
18 | }; |
19 | ||
20 | static inline void | |
21 | trace_seq_init(struct trace_seq *s) | |
22 | { | |
23 | s->len = 0; | |
24 | s->readpos = 0; | |
d184b31c | 25 | s->full = 0; |
9504504c SR |
26 | } |
27 | ||
7b039cb4 SRRH |
28 | /** |
29 | * trace_seq_buffer_ptr - return pointer to next location in buffer | |
30 | * @s: trace sequence descriptor | |
31 | * | |
32 | * Returns the pointer to the buffer where the next write to | |
33 | * the buffer will happen. This is useful to save the location | |
34 | * that is about to be written to and then return the result | |
35 | * of that write. | |
36 | */ | |
37 | static inline unsigned char * | |
38 | trace_seq_buffer_ptr(struct trace_seq *s) | |
39 | { | |
40 | return s->buffer + s->len; | |
41 | } | |
42 | ||
19a7fe20 SRRH |
43 | /** |
44 | * trace_seq_has_overflowed - return true if the trace_seq took too much | |
45 | * @s: trace sequence descriptor | |
46 | * | |
47 | * Returns true if too much data was added to the trace_seq and it is | |
48 | * now full and will not take anymore. | |
49 | */ | |
50 | static inline bool trace_seq_has_overflowed(struct trace_seq *s) | |
51 | { | |
52 | return s->full || s->len > PAGE_SIZE - 1; | |
53 | } | |
54 | ||
9504504c SR |
55 | /* |
56 | * Currently only defined when tracing is enabled. | |
57 | */ | |
58 | #ifdef CONFIG_TRACING | |
b9075fa9 | 59 | extern __printf(2, 3) |
dba39448 | 60 | void trace_seq_printf(struct trace_seq *s, const char *fmt, ...); |
b9075fa9 | 61 | extern __printf(2, 0) |
dba39448 SRRH |
62 | void trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args); |
63 | extern void | |
9504504c | 64 | trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary); |
a63ce5b3 | 65 | extern int trace_print_seq(struct seq_file *m, struct trace_seq *s); |
36aabfff SRRH |
66 | extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, |
67 | int cnt); | |
dba39448 SRRH |
68 | extern void trace_seq_puts(struct trace_seq *s, const char *str); |
69 | extern void trace_seq_putc(struct trace_seq *s, unsigned char c); | |
70 | extern void trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len); | |
71 | extern void trace_seq_putmem_hex(struct trace_seq *s, const void *mem, | |
36aabfff | 72 | unsigned int len); |
38eff289 | 73 | extern int trace_seq_path(struct trace_seq *s, const struct path *path); |
9504504c | 74 | |
dba39448 | 75 | extern void trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, |
4449bf92 SRRH |
76 | int nmaskbits); |
77 | ||
9504504c | 78 | #else /* CONFIG_TRACING */ |
dba39448 | 79 | static inline void trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
9504504c | 80 | { |
9504504c | 81 | } |
dba39448 | 82 | static inline void |
9504504c SR |
83 | trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) |
84 | { | |
9504504c SR |
85 | } |
86 | ||
dba39448 | 87 | static inline void |
4449bf92 SRRH |
88 | trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, |
89 | int nmaskbits) | |
90 | { | |
4449bf92 SRRH |
91 | } |
92 | ||
a63ce5b3 | 93 | static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s) |
9504504c | 94 | { |
a63ce5b3 | 95 | return 0; |
9504504c | 96 | } |
36aabfff SRRH |
97 | static inline int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, |
98 | int cnt) | |
9504504c SR |
99 | { |
100 | return 0; | |
101 | } | |
dba39448 | 102 | static inline void trace_seq_puts(struct trace_seq *s, const char *str) |
9504504c | 103 | { |
9504504c | 104 | } |
dba39448 | 105 | static inline void trace_seq_putc(struct trace_seq *s, unsigned char c) |
9504504c | 106 | { |
9504504c | 107 | } |
dba39448 | 108 | static inline void |
36aabfff | 109 | trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len) |
9504504c | 110 | { |
9504504c | 111 | } |
dba39448 | 112 | static inline void trace_seq_putmem_hex(struct trace_seq *s, const void *mem, |
36aabfff | 113 | unsigned int len) |
9504504c | 114 | { |
9504504c | 115 | } |
38eff289 | 116 | static inline int trace_seq_path(struct trace_seq *s, const struct path *path) |
9504504c SR |
117 | { |
118 | return 0; | |
119 | } | |
120 | #endif /* CONFIG_TRACING */ | |
121 | ||
122 | #endif /* _LINUX_TRACE_SEQ_H */ |