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  * Dual LGPL v2.1/GPL v2 license.
  12  */
  13
  14 #include <linux/fs.h>
  15
  16 #define LTTNG_SYM_NAME_LEN      128
  17
  18 enum lttng_kernel_instrumentation {
  19         LTTNG_KERNEL_TRACEPOINT,
  20         LTTNG_KERNEL_KPROBE,
  21         LTTNG_KERNEL_FUNCTION,
  22 };
  23
  24 /*
  25  * LTTng DebugFS ABI structures.
  26  */
  27
  28 struct lttng_kernel_channel {
  29         int overwrite;                          /* 1: overwrite, 0: discard */
  30         uint64_t subbuf_size;                   /* in bytes */
  31         uint64_t num_subbuf;
  32         unsigned int switch_timer_interval;     /* usecs */
  33         unsigned int read_timer_interval;       /* usecs */
  34 };
  35
  36 /*
  37  * Either addr is used, or symbol_name and offset.
  38  */
  39 struct lttng_kernel_kprobe {
  40         uint64_t addr;
  41
  42         uint64_t offset;
  43         char symbol_name[LTTNG_SYM_NAME_LEN];
  44 };
  45
  46 struct lttng_kernel_function_tracer {
  47         char symbol_name[LTTNG_SYM_NAME_LEN];
  48 };
  49
  50 struct lttng_kernel_event {
  51         char name[LTTNG_SYM_NAME_LEN];  /* event name */
  52         enum lttng_kernel_instrumentation instrumentation;
  53         /* Per instrumentation type configuration */
  54         union {
  55                 struct lttng_kernel_kprobe kprobe;
  56                 struct lttng_kernel_function_tracer ftrace;
  57         } u;
  58 };
  59
  60 struct lttng_kernel_tracer_version {
  61         uint32_t version;
  62         uint32_t patchlevel;
  63         uint32_t sublevel;
  64 };
  65
  66 enum lttng_kernel_context_type {
  67         LTTNG_KERNEL_CONTEXT_PID,
  68         LTTNG_KERNEL_CONTEXT_PERF_COUNTER,
  69         LTTNG_KERNEL_CONTEXT_COMM,
  70         LTTNG_KERNEL_CONTEXT_PRIO,
  71         LTTNG_KERNEL_CONTEXT_NICE,
  72 };
  73
  74 struct lttng_kernel_perf_counter_ctx {
  75         uint32_t type;
  76         uint64_t config;
  77 };
  78
  79 struct lttng_kernel_context {
  80         enum lttng_kernel_context_type ctx;
  81         union {
  82                 struct lttng_kernel_perf_counter_ctx perf_counter;
  83         } u;
  84 };
  85
  86 /* LTTng file descriptor ioctl */
  87 #define LTTNG_KERNEL_SESSION                    _IO(0xF6, 0x40)
  88 #define LTTNG_KERNEL_TRACER_VERSION             \
  89         _IOR(0xF6, 0x41, struct lttng_kernel_tracer_version)
  90 #define LTTNG_KERNEL_TRACEPOINT_LIST            _IO(0xF6, 0x42)
  91
  92 /* Session FD ioctl */
  93 #define LTTNG_KERNEL_METADATA                   \
  94         _IOW(0xF6, 0x50, struct lttng_kernel_channel)
  95 #define LTTNG_KERNEL_CHANNEL                    \
  96         _IOW(0xF6, 0x51, struct lttng_kernel_channel)
  97 #define LTTNG_KERNEL_SESSION_START              _IO(0xF6, 0x52)
  98 #define LTTNG_KERNEL_SESSION_STOP               _IO(0xF6, 0x53)
  99
 100 /* Channel FD ioctl */
 101 #define LTTNG_KERNEL_STREAM                     _IO(0xF6, 0x60)
 102 #define LTTNG_KERNEL_EVENT                      \
 103         _IOW(0xF6, 0x61, struct lttng_kernel_event)
 104
 105 /* Event and Channel FD ioctl */
 106 #define LTTNG_KERNEL_CONTEXT                    \
 107         _IOW(0xF6, 0x70, struct lttng_kernel_context)
 108
 109 #endif /* _LTT_DEBUGFS_ABI_H */