lttng-abi.h

   1 #ifndef _LTTNG_ABI_H
   2 #define _LTTNG_ABI_H
   3
   4 /*
   5  * lttng-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      256
  17
  18 enum lttng_kernel_instrumentation {
  19         LTTNG_KERNEL_TRACEPOINT = 0,
  20         LTTNG_KERNEL_KPROBE     = 1,
  21         LTTNG_KERNEL_FUNCTION   = 2,
  22         LTTNG_KERNEL_KRETPROBE  = 3,
  23         LTTNG_KERNEL_NOOP       = 4,    /* not hooked */
  24         LTTNG_KERNEL_SYSCALL    = 5,
  25 };
  26
  27 /*
  28  * LTTng consumer mode
  29  */
  30 enum lttng_kernel_output {
  31         LTTNG_KERNEL_SPLICE     = 0,
  32         LTTNG_KERNEL_MMAP       = 1,
  33 };
  34
  35 /*
  36  * LTTng DebugFS ABI structures.
  37  */
  38
  39 struct lttng_kernel_channel {
  40         int overwrite;                          /* 1: overwrite, 0: discard */
  41         uint64_t subbuf_size;                   /* in bytes */
  42         uint64_t num_subbuf;
  43         unsigned int switch_timer_interval;     /* usecs */
  44         unsigned int read_timer_interval;       /* usecs */
  45         enum lttng_kernel_output output;        /* splice, mmap */
  46 };
  47
  48 struct lttng_kernel_kretprobe {
  49         uint64_t addr;
  50
  51         uint64_t offset;
  52         char symbol_name[LTTNG_SYM_NAME_LEN];
  53 };
  54
  55 /*
  56  * Either addr is used, or symbol_name and offset.
  57  */
  58 struct lttng_kernel_kprobe {
  59         uint64_t addr;
  60
  61         uint64_t offset;
  62         char symbol_name[LTTNG_SYM_NAME_LEN];
  63 };
  64
  65 struct lttng_kernel_function_tracer {
  66         char symbol_name[LTTNG_SYM_NAME_LEN];
  67 };
  68
  69 /*
  70  * For syscall tracing, name = '\0' means "enable all".
  71  */
  72 struct lttng_kernel_event {
  73         char name[LTTNG_SYM_NAME_LEN];  /* event name */
  74         enum lttng_kernel_instrumentation instrumentation;
  75         /* Per instrumentation type configuration */
  76         union {
  77                 struct lttng_kernel_kretprobe kretprobe;
  78                 struct lttng_kernel_kprobe kprobe;
  79                 struct lttng_kernel_function_tracer ftrace;
  80         } u;
  81 };
  82
  83 struct lttng_kernel_tracer_version {
  84         uint32_t version;
  85         uint32_t patchlevel;
  86         uint32_t sublevel;
  87 };
  88
  89 enum lttng_kernel_calibrate_type {
  90         LTTNG_KERNEL_CALIBRATE_KRETPROBE,
  91 };
  92
  93 struct lttng_kernel_calibrate {
  94         enum lttng_kernel_calibrate_type type;  /* type (input) */
  95 };
  96
  97 enum lttng_kernel_context_type {
  98         LTTNG_KERNEL_CONTEXT_PID                = 0,
  99         LTTNG_KERNEL_CONTEXT_PERF_COUNTER       = 1,
 100         LTTNG_KERNEL_CONTEXT_PROCNAME           = 2,
 101         LTTNG_KERNEL_CONTEXT_PRIO               = 3,
 102         LTTNG_KERNEL_CONTEXT_NICE               = 4,
 103         LTTNG_KERNEL_CONTEXT_VPID               = 5,
 104         LTTNG_KERNEL_CONTEXT_TID                = 6,
 105         LTTNG_KERNEL_CONTEXT_VTID               = 7,
 106         LTTNG_KERNEL_CONTEXT_PPID               = 8,
 107         LTTNG_KERNEL_CONTEXT_VPPID              = 9,
 108 };
 109
 110 struct lttng_kernel_perf_counter_ctx {
 111         uint32_t type;
 112         uint64_t config;
 113         char name[LTTNG_SYM_NAME_LEN];
 114 };
 115
 116 struct lttng_kernel_context {
 117         enum lttng_kernel_context_type ctx;
 118         union {
 119                 struct lttng_kernel_perf_counter_ctx perf_counter;
 120         } u;
 121 };
 122
 123 /* LTTng file descriptor ioctl */
 124 #define LTTNG_KERNEL_SESSION                    _IO(0xF6, 0x40)
 125 #define LTTNG_KERNEL_TRACER_VERSION             \
 126         _IOR(0xF6, 0x41, struct lttng_kernel_tracer_version)
 127 #define LTTNG_KERNEL_TRACEPOINT_LIST            _IO(0xF6, 0x42)
 128 #define LTTNG_KERNEL_WAIT_QUIESCENT             _IO(0xF6, 0x43)
 129 #define LTTNG_KERNEL_CALIBRATE                  \
 130         _IOWR(0xF6, 0x44, struct lttng_kernel_calibrate)
 131
 132 /* Session FD ioctl */
 133 #define LTTNG_KERNEL_METADATA                   \
 134         _IOW(0xF6, 0x50, struct lttng_kernel_channel)
 135 #define LTTNG_KERNEL_CHANNEL                    \
 136         _IOW(0xF6, 0x51, struct lttng_kernel_channel)
 137 #define LTTNG_KERNEL_SESSION_START              _IO(0xF6, 0x52)
 138 #define LTTNG_KERNEL_SESSION_STOP               _IO(0xF6, 0x53)
 139
 140 /* Channel FD ioctl */
 141 #define LTTNG_KERNEL_STREAM                     _IO(0xF6, 0x60)
 142 #define LTTNG_KERNEL_EVENT                      \
 143         _IOW(0xF6, 0x61, struct lttng_kernel_event)
 144
 145 /* Event and Channel FD ioctl */
 146 #define LTTNG_KERNEL_CONTEXT                    \
 147         _IOW(0xF6, 0x70, struct lttng_kernel_context)
 148
 149 /* Event, Channel and Session ioctl */
 150 #define LTTNG_KERNEL_ENABLE                     _IO(0xF6, 0x80)
 151 #define LTTNG_KERNEL_DISABLE                    _IO(0xF6, 0x81)
 152
 153 #endif /* _LTTNG_ABI_H */