lttng-abi.h

   1 #ifndef _LTTNG_ABI_H
   2 #define _LTTNG_ABI_H
   3
   4 /*
   5  * lttng-abi.h
   6  *
   7  * LTTng ABI header
   8  *
   9  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; only
  14  * version 2.1 of the License.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <linux/fs.h>
  27
  28 #define LTTNG_KERNEL_SYM_NAME_LEN       256
  29
  30 enum lttng_kernel_instrumentation {
  31         LTTNG_KERNEL_TRACEPOINT = 0,
  32         LTTNG_KERNEL_KPROBE     = 1,
  33         LTTNG_KERNEL_FUNCTION   = 2,
  34         LTTNG_KERNEL_KRETPROBE  = 3,
  35         LTTNG_KERNEL_NOOP       = 4,    /* not hooked */
  36         LTTNG_KERNEL_SYSCALL    = 5,
  37 };
  38
  39 /*
  40  * LTTng consumer mode
  41  */
  42 enum lttng_kernel_output {
  43         LTTNG_KERNEL_SPLICE     = 0,
  44         LTTNG_KERNEL_MMAP       = 1,
  45 };
  46
  47 /*
  48  * LTTng DebugFS ABI structures.
  49  */
  50 #define LTTNG_KERNEL_CHANNEL_PADDING    LTTNG_KERNEL_SYM_NAME_LEN + 32
  51 struct lttng_kernel_channel {
  52         uint64_t subbuf_size;                   /* in bytes */
  53         uint64_t num_subbuf;
  54         unsigned int switch_timer_interval;     /* usecs */
  55         unsigned int read_timer_interval;       /* usecs */
  56         enum lttng_kernel_output output;        /* splice, mmap */
  57         int overwrite;                          /* 1: overwrite, 0: discard */
  58         char padding[LTTNG_KERNEL_CHANNEL_PADDING];
  59 }__attribute__((packed));
  60
  61 struct lttng_kernel_kretprobe {
  62         uint64_t addr;
  63
  64         uint64_t offset;
  65         char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
  66 }__attribute__((packed));
  67
  68 /*
  69  * Either addr is used, or symbol_name and offset.
  70  */
  71 struct lttng_kernel_kprobe {
  72         uint64_t addr;
  73
  74         uint64_t offset;
  75         char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
  76 }__attribute__((packed));
  77
  78 struct lttng_kernel_function_tracer {
  79         char symbol_name[LTTNG_KERNEL_SYM_NAME_LEN];
  80 }__attribute__((packed));
  81
  82 struct lttng_kernel_syscall {
  83         char disable;
  84 } __attribute__((packed));
  85
  86 /*
  87  * For syscall tracing, name = '\0' means "enable all".
  88  */
  89 #define LTTNG_KERNEL_EVENT_PADDING1     16
  90 #define LTTNG_KERNEL_EVENT_PADDING2     LTTNG_KERNEL_SYM_NAME_LEN + 32
  91 struct lttng_kernel_event {
  92         char name[LTTNG_KERNEL_SYM_NAME_LEN];   /* event name */
  93         enum lttng_kernel_instrumentation instrumentation;
  94         char padding[LTTNG_KERNEL_EVENT_PADDING1];
  95
  96         /* Per instrumentation type configuration */
  97         union {
  98                 struct lttng_kernel_kretprobe kretprobe;
  99                 struct lttng_kernel_kprobe kprobe;
 100                 struct lttng_kernel_function_tracer ftrace;
 101                 struct lttng_kernel_syscall syscall;
 102                 char padding[LTTNG_KERNEL_EVENT_PADDING2];
 103         } u;
 104 }__attribute__((packed));
 105
 106 struct lttng_kernel_tracer_version {
 107         uint32_t major;
 108         uint32_t minor;
 109         uint32_t patchlevel;
 110 }__attribute__((packed));
 111
 112 enum lttng_kernel_calibrate_type {
 113         LTTNG_KERNEL_CALIBRATE_KRETPROBE,
 114 };
 115
 116 struct lttng_kernel_calibrate {
 117         enum lttng_kernel_calibrate_type type;  /* type (input) */
 118 }__attribute__((packed));
 119
 120 enum lttng_kernel_context_type {
 121         LTTNG_KERNEL_CONTEXT_PID                = 0,
 122         LTTNG_KERNEL_CONTEXT_PERF_COUNTER       = 1,
 123         LTTNG_KERNEL_CONTEXT_PROCNAME           = 2,
 124         LTTNG_KERNEL_CONTEXT_PRIO               = 3,
 125         LTTNG_KERNEL_CONTEXT_NICE               = 4,
 126         LTTNG_KERNEL_CONTEXT_VPID               = 5,
 127         LTTNG_KERNEL_CONTEXT_TID                = 6,
 128         LTTNG_KERNEL_CONTEXT_VTID               = 7,
 129         LTTNG_KERNEL_CONTEXT_PPID               = 8,
 130         LTTNG_KERNEL_CONTEXT_VPPID              = 9,
 131         LTTNG_KERNEL_CONTEXT_HOSTNAME           = 10,
 132 };
 133
 134 struct lttng_kernel_perf_counter_ctx {
 135         uint32_t type;
 136         uint64_t config;
 137         char name[LTTNG_KERNEL_SYM_NAME_LEN];
 138 }__attribute__((packed));
 139
 140 #define LTTNG_KERNEL_CONTEXT_PADDING1   16
 141 #define LTTNG_KERNEL_CONTEXT_PADDING2   LTTNG_KERNEL_SYM_NAME_LEN + 32
 142 struct lttng_kernel_context {
 143         enum lttng_kernel_context_type ctx;
 144         char padding[LTTNG_KERNEL_CONTEXT_PADDING1];
 145
 146         union {
 147                 struct lttng_kernel_perf_counter_ctx perf_counter;
 148                 char padding[LTTNG_KERNEL_CONTEXT_PADDING2];
 149         } u;
 150 }__attribute__((packed));
 151
 152 /* LTTng file descriptor ioctl */
 153 #define LTTNG_KERNEL_SESSION                    _IO(0xF6, 0x45)
 154 #define LTTNG_KERNEL_TRACER_VERSION             \
 155         _IOR(0xF6, 0x46, struct lttng_kernel_tracer_version)
 156 #define LTTNG_KERNEL_TRACEPOINT_LIST            _IO(0xF6, 0x47)
 157 #define LTTNG_KERNEL_WAIT_QUIESCENT             _IO(0xF6, 0x48)
 158 #define LTTNG_KERNEL_CALIBRATE                  \
 159         _IOWR(0xF6, 0x49, struct lttng_kernel_calibrate)
 160
 161 /* Session FD ioctl */
 162 #define LTTNG_KERNEL_METADATA                   \
 163         _IOW(0xF6, 0x54, struct lttng_kernel_channel)
 164 #define LTTNG_KERNEL_CHANNEL                    \
 165         _IOW(0xF6, 0x55, struct lttng_kernel_channel)
 166 #define LTTNG_KERNEL_SESSION_START              _IO(0xF6, 0x56)
 167 #define LTTNG_KERNEL_SESSION_STOP               _IO(0xF6, 0x57)
 168
 169 /* Channel FD ioctl */
 170 #define LTTNG_KERNEL_STREAM                     _IO(0xF6, 0x62)
 171 #define LTTNG_KERNEL_EVENT                      \
 172         _IOW(0xF6, 0x63, struct lttng_kernel_event)
 173
 174 /* Event and Channel FD ioctl */
 175 #define LTTNG_KERNEL_CONTEXT                    \
 176         _IOW(0xF6, 0x71, struct lttng_kernel_context)
 177
 178 /* Event, Channel and Session ioctl */
 179 #define LTTNG_KERNEL_ENABLE                     _IO(0xF6, 0x82)
 180 #define LTTNG_KERNEL_DISABLE                    _IO(0xF6, 0x83)
 181
 182 /* LTTng-specific ioctls for the lib ringbuffer */
 183 /* returns the timestamp begin of the current sub-buffer */
 184 #define LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN   _IOR(0xF6, 0x20, uint64_t)
 185 /* returns the timestamp end of the current sub-buffer */
 186 #define LTTNG_RING_BUFFER_GET_TIMESTAMP_END     _IOR(0xF6, 0x21, uint64_t)
 187 /* returns the number of events discarded */
 188 #define LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED  _IOR(0xF6, 0x22, uint64_t)
 189 /* returns the packet payload size */
 190 #define LTTNG_RING_BUFFER_GET_CONTENT_SIZE      _IOR(0xF6, 0x23, uint64_t)
 191 /* returns the actual packet size */
 192 #define LTTNG_RING_BUFFER_GET_PACKET_SIZE       _IOR(0xF6, 0x24, uint64_t)
 193 /* returns the stream id */
 194 #define LTTNG_RING_BUFFER_GET_STREAM_ID         _IOR(0xF6, 0x25, uint64_t)
 195 /* returns the current timestamp */
 196 #define LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP _IOR(0xF6, 0x26, uint64_t)
 197
 198 #ifdef CONFIG_COMPAT
 199 /* returns the timestamp begin of the current sub-buffer */
 200 #define LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN \
 201         LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
 202 /* returns the timestamp end of the current sub-buffer */
 203 #define LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END \
 204         LTTNG_RING_BUFFER_GET_TIMESTAMP_END
 205 /* returns the number of events discarded */
 206 #define LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED \
 207         LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
 208 /* returns the packet payload size */
 209 #define LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE \
 210         LTTNG_RING_BUFFER_GET_CONTENT_SIZE
 211 /* returns the actual packet size */
 212 #define LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE \
 213         LTTNG_RING_BUFFER_GET_PACKET_SIZE
 214 /* returns the stream id */
 215 #define LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID \
 216         LTTNG_RING_BUFFER_GET_STREAM_ID
 217 /* returns the current timestamp */
 218 #define LTTNG_RING_BUFFER_COMPAT_GET_CURRENT_TIMESTAMP \
 219         LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
 220 #endif /* CONFIG_COMPAT */
 221
 222 #endif /* _LTTNG_ABI_H */