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 enable;
  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 struct lttng_kernel_syscall_mask {
 121         uint32_t len;   /* in bits */
 122         char mask[];
 123 } __attribute__((packed));
 124
 125 enum lttng_kernel_context_type {
 126         LTTNG_KERNEL_CONTEXT_PID                = 0,
 127         LTTNG_KERNEL_CONTEXT_PERF_COUNTER       = 1,
 128         LTTNG_KERNEL_CONTEXT_PROCNAME           = 2,
 129         LTTNG_KERNEL_CONTEXT_PRIO               = 3,
 130         LTTNG_KERNEL_CONTEXT_NICE               = 4,
 131         LTTNG_KERNEL_CONTEXT_VPID               = 5,
 132         LTTNG_KERNEL_CONTEXT_TID                = 6,
 133         LTTNG_KERNEL_CONTEXT_VTID               = 7,
 134         LTTNG_KERNEL_CONTEXT_PPID               = 8,
 135         LTTNG_KERNEL_CONTEXT_VPPID              = 9,
 136         LTTNG_KERNEL_CONTEXT_HOSTNAME           = 10,
 137 };
 138
 139 struct lttng_kernel_perf_counter_ctx {
 140         uint32_t type;
 141         uint64_t config;
 142         char name[LTTNG_KERNEL_SYM_NAME_LEN];
 143 } __attribute__((packed));
 144
 145 #define LTTNG_KERNEL_CONTEXT_PADDING1   16
 146 #define LTTNG_KERNEL_CONTEXT_PADDING2   LTTNG_KERNEL_SYM_NAME_LEN + 32
 147 struct lttng_kernel_context {
 148         enum lttng_kernel_context_type ctx;
 149         char padding[LTTNG_KERNEL_CONTEXT_PADDING1];
 150
 151         union {
 152                 struct lttng_kernel_perf_counter_ctx perf_counter;
 153                 char padding[LTTNG_KERNEL_CONTEXT_PADDING2];
 154         } u;
 155 } __attribute__((packed));
 156
 157 /* LTTng file descriptor ioctl */
 158 #define LTTNG_KERNEL_SESSION                    _IO(0xF6, 0x45)
 159 #define LTTNG_KERNEL_TRACER_VERSION             \
 160         _IOR(0xF6, 0x46, struct lttng_kernel_tracer_version)
 161 #define LTTNG_KERNEL_TRACEPOINT_LIST            _IO(0xF6, 0x47)
 162 #define LTTNG_KERNEL_WAIT_QUIESCENT             _IO(0xF6, 0x48)
 163 #define LTTNG_KERNEL_CALIBRATE                  \
 164         _IOWR(0xF6, 0x49, struct lttng_kernel_calibrate)
 165 #define LTTNG_KERNEL_SYSCALL_LIST               _IO(0xF6, 0x49)
 166
 167 /* Session FD ioctl */
 168 #define LTTNG_KERNEL_METADATA                   \
 169         _IOW(0xF6, 0x54, struct lttng_kernel_channel)
 170 #define LTTNG_KERNEL_CHANNEL                    \
 171         _IOW(0xF6, 0x55, struct lttng_kernel_channel)
 172 #define LTTNG_KERNEL_SESSION_START              _IO(0xF6, 0x56)
 173 #define LTTNG_KERNEL_SESSION_STOP               _IO(0xF6, 0x57)
 174
 175 /* Channel FD ioctl */
 176 #define LTTNG_KERNEL_STREAM                     _IO(0xF6, 0x62)
 177 #define LTTNG_KERNEL_EVENT                      \
 178         _IOW(0xF6, 0x63, struct lttng_kernel_event)
 179 #define LTTNG_KERNEL_SYSCALL_MASK               \
 180         _IOWR(0xF6, 0x64, struct lttng_kernel_syscall_mask)
 181
 182 /* Event and Channel FD ioctl */
 183 #define LTTNG_KERNEL_CONTEXT                    \
 184         _IOW(0xF6, 0x71, struct lttng_kernel_context)
 185
 186 /* Event, Channel and Session ioctl */
 187 #define LTTNG_KERNEL_ENABLE                     _IO(0xF6, 0x82)
 188 #define LTTNG_KERNEL_DISABLE                    _IO(0xF6, 0x83)
 189
 190 /* LTTng-specific ioctls for the lib ringbuffer */
 191 /* returns the timestamp begin of the current sub-buffer */
 192 #define LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN   _IOR(0xF6, 0x20, uint64_t)
 193 /* returns the timestamp end of the current sub-buffer */
 194 #define LTTNG_RING_BUFFER_GET_TIMESTAMP_END     _IOR(0xF6, 0x21, uint64_t)
 195 /* returns the number of events discarded */
 196 #define LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED  _IOR(0xF6, 0x22, uint64_t)
 197 /* returns the packet payload size */
 198 #define LTTNG_RING_BUFFER_GET_CONTENT_SIZE      _IOR(0xF6, 0x23, uint64_t)
 199 /* returns the actual packet size */
 200 #define LTTNG_RING_BUFFER_GET_PACKET_SIZE       _IOR(0xF6, 0x24, uint64_t)
 201 /* returns the stream id */
 202 #define LTTNG_RING_BUFFER_GET_STREAM_ID         _IOR(0xF6, 0x25, uint64_t)
 203 /* returns the current timestamp */
 204 #define LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP _IOR(0xF6, 0x26, uint64_t)
 205
 206 #ifdef CONFIG_COMPAT
 207 /* returns the timestamp begin of the current sub-buffer */
 208 #define LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_BEGIN \
 209         LTTNG_RING_BUFFER_GET_TIMESTAMP_BEGIN
 210 /* returns the timestamp end of the current sub-buffer */
 211 #define LTTNG_RING_BUFFER_COMPAT_GET_TIMESTAMP_END \
 212         LTTNG_RING_BUFFER_GET_TIMESTAMP_END
 213 /* returns the number of events discarded */
 214 #define LTTNG_RING_BUFFER_COMPAT_GET_EVENTS_DISCARDED \
 215         LTTNG_RING_BUFFER_GET_EVENTS_DISCARDED
 216 /* returns the packet payload size */
 217 #define LTTNG_RING_BUFFER_COMPAT_GET_CONTENT_SIZE \
 218         LTTNG_RING_BUFFER_GET_CONTENT_SIZE
 219 /* returns the actual packet size */
 220 #define LTTNG_RING_BUFFER_COMPAT_GET_PACKET_SIZE \
 221         LTTNG_RING_BUFFER_GET_PACKET_SIZE
 222 /* returns the stream id */
 223 #define LTTNG_RING_BUFFER_COMPAT_GET_STREAM_ID \
 224         LTTNG_RING_BUFFER_GET_STREAM_ID
 225 /* returns the current timestamp */
 226 #define LTTNG_RING_BUFFER_COMPAT_GET_CURRENT_TIMESTAMP \
 227         LTTNG_RING_BUFFER_GET_CURRENT_TIMESTAMP
 228 #endif /* CONFIG_COMPAT */
 229
 230 #endif /* _LTTNG_ABI_H */