ltt-debugfs-abi.h

   1 #ifndef _LTT_DEBUGFS_ABI_H
   2 #define _LTT_DEBUGFS_ABI_H
   3
   4 /*
   5  * ltt-debugfs-abi.h
   6  *
   7  * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * LTTng debugfs ABI header
  10  */
  11
  12 #include <linux/fs.h>
  13
  14 #define LTTNG_SYM_NAME_LEN      128
  15
  16 enum lttng_kernel_instrumentation {
  17         LTTNG_KERNEL_TRACEPOINT,
  18         LTTNG_KERNEL_KPROBE,
  19         LTTNG_KERNEL_FUNCTION,
  20 };
  21
  22 /*
  23  * LTTng DebugFS ABI structures.
  24  */
  25
  26 struct lttng_kernel_channel {
  27         int overwrite;                          /* 1: overwrite, 0: discard */
  28         uint64_t subbuf_size;                   /* in bytes */
  29         uint64_t num_subbuf;
  30         unsigned int switch_timer_interval;     /* usecs */
  31         unsigned int read_timer_interval;       /* usecs */
  32 };
  33
  34 struct lttng_kernel_tracepoint {
  35 };
  36
  37 /*
  38  * Either addr is used, or symbol_name and offset.
  39  */
  40 struct lttng_kernel_kprobe {
  41         uint64_t addr;
  42
  43         uint64_t offset;
  44         char symbol_name[LTTNG_SYM_NAME_LEN];
  45 };
  46
  47 struct lttng_kernel_function_tracer {
  48         char symbol_name[LTTNG_SYM_NAME_LEN];
  49 };
  50
  51 struct lttng_kernel_event {
  52         char name[LTTNG_SYM_NAME_LEN];  /* event name */
  53         enum lttng_kernel_instrumentation instrumentation;
  54         /* Per instrumentation type configuration */
  55         union {
  56                 struct lttng_kernel_tracepoint tracepoint;
  57                 struct lttng_kernel_kprobe kprobe;
  58                 struct lttng_kernel_function_tracer ftrace;
  59         } u;
  60 };
  61
  62 struct lttng_kernel_tracer_version {
  63         uint32_t version;
  64         uint32_t patchlevel;
  65         uint32_t sublevel;
  66 };
  67
  68 /* LTTng file descriptor ioctl */
  69 #define LTTNG_KERNEL_SESSION                    _IO(0xF6, 0x40)
  70 #define LTTNG_KERNEL_TRACER_VERSION             \
  71         _IOR(0xF6, 0x41, struct lttng_kernel_tracer_version)
  72 #define LTTNG_KERNEL_TRACEPOINT_LIST            _IO(0xF6, 0x42)
  73
  74 /* Session FD ioctl */
  75 #define LTTNG_KERNEL_METADATA                   \
  76         _IOW(0xF6, 0x50, struct lttng_kernel_channel)
  77 #define LTTNG_KERNEL_CHANNEL                    \
  78         _IOW(0xF6, 0x51, struct lttng_kernel_channel)
  79 #define LTTNG_KERNEL_SESSION_START              _IO(0xF6, 0x52)
  80 #define LTTNG_KERNEL_SESSION_STOP               _IO(0xF6, 0x53)
  81
  82 /* Channel FD ioctl */
  83 #define LTTNG_KERNEL_STREAM                     _IO(0xF6, 0x60)
  84 #define LTTNG_KERNEL_EVENT                      \
  85         _IOW(0xF6, 0x61, struct lttng_kernel_event)
  86
  87 #endif /* _LTT_DEBUGFS_ABI_H */