include/linux/trace_seq.h

   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 */