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 21 trace_seq_init(struct trace_seq *s) 22 { 23 s->len = 0; 24 s->readpos = 0; 25 s->full = 0; 26 } 27 28 #define MAX_MEMHEX_BYTES 8 29 30 /* 31 * Currently only defined when tracing is enabled. 32 */ 33 #ifdef CONFIG_TRACING 34 extern __printf(2, 3) 35 int trace_seq_printf(struct trace_seq *s, const char *fmt, ...); 36 extern __printf(2, 0) 37 int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args); 38 extern int 39 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary); 40 extern int trace_print_seq(struct seq_file *m, struct trace_seq *s); 41 extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 42 int cnt); 43 extern int trace_seq_puts(struct trace_seq *s, const char *str); 44 extern int trace_seq_putc(struct trace_seq *s, unsigned char c); 45 extern int trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len); 46 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 47 unsigned int len); 48 extern void *trace_seq_reserve(struct trace_seq *s, unsigned int len); 49 extern int trace_seq_path(struct trace_seq *s, const struct path *path); 50 51 extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, 52 int nmaskbits); 53 54 #else /* CONFIG_TRACING */ 55 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...) 56 { 57 return 0; 58 } 59 static inline int 60 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary) 61 { 62 return 0; 63 } 64 65 static inline int 66 trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, 67 int nmaskbits) 68 { 69 return 0; 70 } 71 72 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s) 73 { 74 return 0; 75 } 76 static inline int trace_seq_to_user(struct trace_seq *s, char __user *ubuf, 77 int cnt) 78 { 79 return 0; 80 } 81 static inline int trace_seq_puts(struct trace_seq *s, const char *str) 82 { 83 return 0; 84 } 85 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c) 86 { 87 return 0; 88 } 89 static inline int 90 trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len) 91 { 92 return 0; 93 } 94 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, 95 unsigned int len) 96 { 97 return 0; 98 } 99 static inline void *trace_seq_reserve(struct trace_seq *s, unsigned int len) 100 { 101 return NULL; 102 } 103 static inline int trace_seq_path(struct trace_seq *s, const struct path *path) 104 { 105 return 0; 106 } 107 #endif /* CONFIG_TRACING */ 108 109 #endif /* _LINUX_TRACE_SEQ_H */ 110