include/lttng/ust-abi.h

   1 #ifndef _LTTNG_UST_ABI_H
   2 #define _LTTNG_UST_ABI_H
   3
   4 /*
   5  * lttng/ust-abi.h
   6  *
   7  * LTTng-UST ABI header
   8  *
   9  * Copyright 2010-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  */
  21
  22 #include <stdint.h>
  23
  24 #define LTTNG_UST_SYM_NAME_LEN  256
  25
  26 #define LTTNG_UST_COMM_VERSION_MAJOR            2
  27 #define LTTNG_UST_COMM_VERSION_MINOR            0
  28
  29 enum lttng_ust_instrumentation {
  30         LTTNG_UST_TRACEPOINT            = 0,
  31         LTTNG_UST_PROBE                 = 1,
  32         LTTNG_UST_FUNCTION              = 2,
  33 };
  34
  35 enum lttng_ust_loglevel_type {
  36         LTTNG_UST_LOGLEVEL_ALL          = 0,
  37         LTTNG_UST_LOGLEVEL_RANGE        = 1,
  38         LTTNG_UST_LOGLEVEL_SINGLE       = 2,
  39 };
  40
  41 enum lttng_ust_output {
  42         LTTNG_UST_MMAP          = 0,
  43 };
  44
  45 struct lttng_ust_tracer_version {
  46         uint32_t major;
  47         uint32_t minor;
  48         uint32_t patchlevel;
  49 };
  50
  51 #define LTTNG_UST_CHANNEL_PADDING       LTTNG_UST_SYM_NAME_LEN + 32
  52 struct lttng_ust_channel {
  53         int overwrite;                          /* 1: overwrite, 0: discard */
  54         uint64_t subbuf_size;                   /* in bytes */
  55         uint64_t num_subbuf;
  56         unsigned int switch_timer_interval;     /* usecs */
  57         unsigned int read_timer_interval;       /* usecs */
  58         enum lttng_ust_output output;           /* output mode */
  59         char padding[LTTNG_UST_CHANNEL_PADDING];
  60 };
  61
  62 #define LTTNG_UST_STREAM_PADDING1       16
  63 #define LTTNG_UST_STREAM_PADDING2       LTTNG_UST_SYM_NAME_LEN + 32
  64 struct lttng_ust_stream {
  65         char padding[LTTNG_UST_STREAM_PADDING1];
  66
  67         union {
  68                 char padding[LTTNG_UST_STREAM_PADDING2];
  69         } u;
  70 };
  71
  72 #define LTTNG_UST_EVENT_PADDING1        16
  73 #define LTTNG_UST_EVENT_PADDING2        LTTNG_UST_SYM_NAME_LEN + 32
  74 struct lttng_ust_event {
  75         enum lttng_ust_instrumentation instrumentation;
  76         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
  77
  78         enum lttng_ust_loglevel_type loglevel_type;
  79         int loglevel;   /* value, -1: all */
  80         char padding[LTTNG_UST_EVENT_PADDING1];
  81
  82         /* Per instrumentation type configuration */
  83         union {
  84                 char padding[LTTNG_UST_EVENT_PADDING2];
  85         } u;
  86 };
  87
  88 enum lttng_ust_context_type {
  89         LTTNG_UST_CONTEXT_VTID                  = 0,
  90         LTTNG_UST_CONTEXT_VPID                  = 1,
  91         LTTNG_UST_CONTEXT_PTHREAD_ID            = 2,
  92         LTTNG_UST_CONTEXT_PROCNAME              = 3,
  93 };
  94
  95 #define LTTNG_UST_CONTEXT_PADDING1      16
  96 #define LTTNG_UST_CONTEXT_PADDING2      LTTNG_UST_SYM_NAME_LEN + 32
  97 struct lttng_ust_context {
  98         enum lttng_ust_context_type ctx;
  99         char padding[LTTNG_UST_CONTEXT_PADDING1];
 100
 101         union {
 102                 char padding[LTTNG_UST_CONTEXT_PADDING2];
 103         } u;
 104 };
 105
 106 /*
 107  * Tracer channel attributes.
 108  */
 109 #define LTTNG_UST_CHANNEL_ATTR_PADDING  LTTNG_UST_SYM_NAME_LEN + 32
 110 struct lttng_ust_channel_attr {
 111         int overwrite;                          /* 1: overwrite, 0: discard */
 112         uint64_t subbuf_size;                   /* bytes */
 113         uint64_t num_subbuf;                    /* power of 2 */
 114         unsigned int switch_timer_interval;     /* usec */
 115         unsigned int read_timer_interval;       /* usec */
 116         enum lttng_ust_output output;           /* splice, mmap */
 117         char padding[LTTNG_UST_CHANNEL_ATTR_PADDING];
 118 };
 119
 120 #define LTTNG_UST_TRACEPOINT_ITER_PADDING       16
 121 struct lttng_ust_tracepoint_iter {
 122         char name[LTTNG_UST_SYM_NAME_LEN];      /* provider:name */
 123         int loglevel;
 124         char padding[LTTNG_UST_TRACEPOINT_ITER_PADDING];
 125 };
 126
 127 #define LTTNG_UST_OBJECT_DATA_PADDING           LTTNG_UST_SYM_NAME_LEN + 32
 128 struct lttng_ust_object_data {
 129         int handle;
 130         int shm_fd;
 131         char *shm_path;
 132         int wait_fd;
 133         char *wait_pipe_path;
 134         uint64_t memory_map_size;
 135         char padding[LTTNG_UST_OBJECT_DATA_PADDING];
 136 };
 137
 138 enum lttng_ust_calibrate_type {
 139         LTTNG_UST_CALIBRATE_TRACEPOINT,
 140 };
 141
 142 #define LTTNG_UST_CALIBRATE_PADDING1    16
 143 #define LTTNG_UST_CALIBRATE_PADDING2    LTTNG_UST_SYM_NAME_LEN + 32
 144 struct lttng_ust_calibrate {
 145         enum lttng_ust_calibrate_type type;     /* type (input) */
 146         char padding[LTTNG_UST_CALIBRATE_PADDING1];
 147
 148         union {
 149                 char padding[LTTNG_UST_CALIBRATE_PADDING2];
 150         } u;
 151 };
 152
 153 #define _UST_CMD(minor)                         (minor)
 154 #define _UST_CMDR(minor, type)                  (minor)
 155 #define _UST_CMDW(minor, type)                  (minor)
 156
 157 /* Handled by object descriptor */
 158 #define LTTNG_UST_RELEASE                       _UST_CMD(0x1)
 159
 160 /* Handled by object cmd */
 161
 162 /* LTTng-UST commands */
 163 #define LTTNG_UST_SESSION                       _UST_CMD(0x40)
 164 #define LTTNG_UST_TRACER_VERSION                \
 165         _UST_CMDR(0x41, struct lttng_ust_tracer_version)
 166 #define LTTNG_UST_TRACEPOINT_LIST               _UST_CMD(0x42)
 167 #define LTTNG_UST_WAIT_QUIESCENT                _UST_CMD(0x43)
 168 #define LTTNG_UST_REGISTER_DONE                 _UST_CMD(0x44)
 169
 170 /* Session FD commands */
 171 #define LTTNG_UST_METADATA                      \
 172         _UST_CMDW(0x50, struct lttng_ust_channel)
 173 #define LTTNG_UST_CHANNEL                       \
 174         _UST_CMDW(0x51, struct lttng_ust_channel)
 175 #define LTTNG_UST_SESSION_START                 _UST_CMD(0x52)
 176 #define LTTNG_UST_SESSION_STOP                  _UST_CMD(0x53)
 177
 178 /* Channel FD commands */
 179 #define LTTNG_UST_STREAM                        _UST_CMD(0x60)
 180 #define LTTNG_UST_EVENT                 \
 181         _UST_CMDW(0x61, struct lttng_ust_event)
 182
 183 /* Event and Channel FD commands */
 184 #define LTTNG_UST_CONTEXT                       \
 185         _UST_CMDW(0x70, struct lttng_ust_context)
 186 #define LTTNG_UST_FLUSH_BUFFER                  \
 187         _UST_CMD(0x71)
 188
 189 /* Event, Channel and Session commands */
 190 #define LTTNG_UST_ENABLE                        _UST_CMD(0x80)
 191 #define LTTNG_UST_DISABLE                       _UST_CMD(0x81)
 192
 193 /* Tracepoint list commands */
 194 #define LTTNG_UST_TRACEPOINT_LIST_GET           _UST_CMD(0x90)
 195
 196 #define LTTNG_UST_ROOT_HANDLE   0
 197
 198 struct lttng_ust_obj;
 199
 200 union ust_args {
 201         struct {
 202                 int *shm_fd;
 203                 char *shm_path;
 204                 int *wait_fd;
 205                 char *wait_pipe_path;
 206                 uint64_t *memory_map_size;
 207         } channel;
 208         struct {
 209                 int *shm_fd;
 210                 char *shm_path;
 211                 int *wait_fd;
 212                 char *wait_pipe_path;
 213                 uint64_t *memory_map_size;
 214         } stream;
 215 };
 216
 217 struct lttng_ust_objd_ops {
 218         long (*cmd)(int objd, unsigned int cmd, unsigned long arg,
 219                 union ust_args *args);
 220         int (*release)(int objd);
 221 };
 222
 223 /* Create root handle. Always ID 0. */
 224 int lttng_abi_create_root_handle(void);
 225
 226 const struct lttng_ust_objd_ops *objd_ops(int id);
 227 int lttng_ust_objd_unref(int id);
 228
 229 void lttng_ust_abi_exit(void);
 230 void lttng_ust_events_exit(void);
 231
 232 #endif /* _LTTNG_UST_ABI_H */