1 #ifndef _LINUX_TRACE_SEQ_H
2 #define _LINUX_TRACE_SEQ_H
3
4 #include <linux/fs.h>
5
6 #include <asm/page.h>
7
8 /*
9 * Trace sequences are used to allow a function to call several other functions
10 * to create a string of data to use (up to a max of PAGE_SIZE).
11 */
12
13 struct trace_seq {
14 unsigned char buffer[PAGE_SIZE];
15 unsigned int len;
16 unsigned int readpos;
17 int full;
18 };
19
20 static inline void
trace_seq_init(struct trace_seq * s)21 trace_seq_init(struct trace_seq *s)
22 {
23 s->len = 0;
24 s->readpos = 0;
25 s->full = 0;
26 }
27
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 *
trace_seq_buffer_ptr(struct trace_seq * s)38 trace_seq_buffer_ptr(struct trace_seq *s)
39 {
40 return s->buffer + s->len;
41 }
42
43 /*
44 * Currently only defined when tracing is enabled.
45 */
46 #ifdef CONFIG_TRACING
47 extern __printf(2, 3)
48 int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
49 extern __printf(2, 0)
50 int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args);
51 extern int
52 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
53 extern int trace_print_seq(struct seq_file *m, struct trace_seq *s);
54 extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
55 int cnt);
56 extern int trace_seq_puts(struct trace_seq *s, const char *str);
57 extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
58 extern int trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len);
59 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
60 unsigned int len);
61 extern int trace_seq_path(struct trace_seq *s, const struct path *path);
62
63 extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
64 int nmaskbits);
65
66 #else /* CONFIG_TRACING */
trace_seq_printf(struct trace_seq * s,const char * fmt,...)67 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
68 {
69 return 0;
70 }
71 static inline int
trace_seq_bprintf(struct trace_seq * s,const char * fmt,const u32 * binary)72 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
73 {
74 return 0;
75 }
76
77 static inline int
trace_seq_bitmask(struct trace_seq * s,const unsigned long * maskp,int nmaskbits)78 trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
79 int nmaskbits)
80 {
81 return 0;
82 }
83
trace_print_seq(struct seq_file * m,struct trace_seq * s)84 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
85 {
86 return 0;
87 }
trace_seq_to_user(struct trace_seq * s,char __user * ubuf,int cnt)88 static inline int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
89 int cnt)
90 {
91 return 0;
92 }
trace_seq_puts(struct trace_seq * s,const char * str)93 static inline int trace_seq_puts(struct trace_seq *s, const char *str)
94 {
95 return 0;
96 }
trace_seq_putc(struct trace_seq * s,unsigned char c)97 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
98 {
99 return 0;
100 }
101 static inline int
trace_seq_putmem(struct trace_seq * s,const void * mem,unsigned int len)102 trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len)
103 {
104 return 0;
105 }
trace_seq_putmem_hex(struct trace_seq * s,const void * mem,unsigned int len)106 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
107 unsigned int len)
108 {
109 return 0;
110 }
trace_seq_path(struct trace_seq * s,const struct path * path)111 static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
112 {
113 return 0;
114 }
115 #endif /* CONFIG_TRACING */
116
117 #endif /* _LINUX_TRACE_SEQ_H */
118