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 /*
  35  * Either addr is used, or symbol_name and offset.
  36  */
  37 struct lttng_kernel_kprobe {
  38         uint64_t addr;
  39
  40         uint64_t offset;
  41         char symbol_name[LTTNG_SYM_NAME_LEN];
  42 };
  43
  44 struct lttng_kernel_function_tracer {
  45         char symbol_name[LTTNG_SYM_NAME_LEN];
  46 };
  47
  48 struct lttng_kernel_event {
  49         char name[LTTNG_SYM_NAME_LEN];  /* event name */
  50         enum lttng_kernel_instrumentation instrumentation;
  51         /* Per instrumentation type configuration */
  52         union {
  53                 struct lttng_kernel_kprobe kprobe;
  54                 struct lttng_kernel_function_tracer ftrace;
  55         } u;
  56 };
  57
  58 struct lttng_kernel_tracer_version {
  59         uint32_t version;
  60         uint32_t patchlevel;
  61         uint32_t sublevel;
  62 };
  63
  64 enum lttng_kernel_context_type {
  65         LTTNG_KERNEL_CONTEXT_PID,
  66         LTTNG_KERNEL_CONTEXT_PERF_COUNTER,
  67         LTTNG_KERNEL_CONTEXT_COMM,
  68 };
  69
  70 struct lttng_kernel_perf_counter_ctx {
  71         uint32_t type;
  72         uint64_t config;
  73 };
  74
  75 struct lttng_kernel_context {
  76         enum lttng_kernel_context_type ctx;
  77         union {
  78                 struct lttng_kernel_perf_counter_ctx perf_counter;
  79         } u;
  80 };
  81
  82 /* LTTng file descriptor ioctl */
  83 #define LTTNG_KERNEL_SESSION                    _IO(0xF6, 0x40)
  84 #define LTTNG_KERNEL_TRACER_VERSION             \
  85         _IOR(0xF6, 0x41, struct lttng_kernel_tracer_version)
  86 #define LTTNG_KERNEL_TRACEPOINT_LIST            _IO(0xF6, 0x42)
  87
  88 /* Session FD ioctl */
  89 #define LTTNG_KERNEL_METADATA                   \
  90         _IOW(0xF6, 0x50, struct lttng_kernel_channel)
  91 #define LTTNG_KERNEL_CHANNEL                    \
  92         _IOW(0xF6, 0x51, struct lttng_kernel_channel)
  93 #define LTTNG_KERNEL_SESSION_START              _IO(0xF6, 0x52)
  94 #define LTTNG_KERNEL_SESSION_STOP               _IO(0xF6, 0x53)
  95
  96 /* Channel FD ioctl */
  97 #define LTTNG_KERNEL_STREAM                     _IO(0xF6, 0x60)
  98 #define LTTNG_KERNEL_EVENT                      \
  99         _IOW(0xF6, 0x61, struct lttng_kernel_event)
 100
 101 /* Event and Channel FD ioctl */
 102 #define LTTNG_KERNEL_CONTEXT                    \
 103         _IOW(0xF6, 0x70, struct lttng_kernel_context)
 104
 105 #endif /* _LTT_DEBUGFS_ABI_H */