src/bin/lttng-sessiond/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  * Copyright 2010-2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * LTTng-UST ABI header
  10  *
  11  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
  12  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a copy
  15  * of this software and associated documentation files (the "Software"), to deal
  16  * in the Software without restriction, including without limitation the rights
  17  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  18  * copies of the Software, and to permit persons to whom the Software is
  19  * furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice shall be included in
  22  * all copies or substantial portions of the Software.
  23  */
  24
  25 #include <stdint.h>
  26
  27 #define LTTNG_UST_SYM_NAME_LEN  256
  28
  29 #define LTTNG_UST_COMM_VERSION_MAJOR            2
  30 #define LTTNG_UST_COMM_VERSION_MINOR            0
  31
  32 enum lttng_ust_instrumentation {
  33         LTTNG_UST_TRACEPOINT            = 0,
  34         LTTNG_UST_PROBE                 = 1,
  35         LTTNG_UST_FUNCTION              = 2,
  36 };
  37
  38 enum lttng_ust_loglevel_type {
  39         LTTNG_UST_LOGLEVEL_ALL          = 0,
  40         LTTNG_UST_LOGLEVEL_RANGE        = 1,
  41         LTTNG_UST_LOGLEVEL_SINGLE       = 2,
  42 };
  43
  44 enum lttng_ust_output {
  45         LTTNG_UST_MMAP          = 0,
  46 };
  47
  48 struct lttng_ust_tracer_version {
  49         uint32_t major;
  50         uint32_t minor;
  51         uint32_t patchlevel;
  52 };
  53
  54 #define LTTNG_UST_CHANNEL_PADDING       LTTNG_UST_SYM_NAME_LEN + 32
  55 struct lttng_ust_channel {
  56         int overwrite;                          /* 1: overwrite, 0: discard */
  57         uint64_t subbuf_size;                   /* in bytes */
  58         uint64_t num_subbuf;
  59         unsigned int switch_timer_interval;     /* usecs */
  60         unsigned int read_timer_interval;       /* usecs */
  61         enum lttng_ust_output output;           /* output mode */
  62         char padding[LTTNG_UST_CHANNEL_PADDING];
  63 };
  64
  65 #define LTTNG_UST_STREAM_PADDING1       16
  66 #define LTTNG_UST_STREAM_PADDING2       LTTNG_UST_SYM_NAME_LEN + 32
  67 struct lttng_ust_stream {
  68         char padding[LTTNG_UST_STREAM_PADDING1];
  69
  70         union {
  71                 char padding[LTTNG_UST_STREAM_PADDING2];
  72         } u;
  73 };
  74
  75 #define LTTNG_UST_EVENT_PADDING1        16
  76 #define LTTNG_UST_EVENT_PADDING2        LTTNG_UST_SYM_NAME_LEN + 32
  77 struct lttng_ust_event {
  78         enum lttng_ust_instrumentation instrumentation;
  79         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
  80
  81         enum lttng_ust_loglevel_type loglevel_type;
  82         int loglevel;   /* value, -1: all */
  83         char padding[LTTNG_UST_EVENT_PADDING1];
  84
  85         /* Per instrumentation type configuration */
  86         union {
  87                 char padding[LTTNG_UST_EVENT_PADDING2];
  88         } u;
  89 };
  90
  91 enum lttng_ust_context_type {
  92         LTTNG_UST_CONTEXT_VTID                  = 0,
  93         LTTNG_UST_CONTEXT_VPID                  = 1,
  94         LTTNG_UST_CONTEXT_PTHREAD_ID            = 2,
  95         LTTNG_UST_CONTEXT_PROCNAME              = 3,
  96 };
  97
  98 #define LTTNG_UST_CONTEXT_PADDING1      16
  99 #define LTTNG_UST_CONTEXT_PADDING2      LTTNG_UST_SYM_NAME_LEN + 32
 100 struct lttng_ust_context {
 101         enum lttng_ust_context_type ctx;
 102         char padding[LTTNG_UST_CONTEXT_PADDING1];
 103
 104         union {
 105                 char padding[LTTNG_UST_CONTEXT_PADDING2];
 106         } u;
 107 };
 108
 109 /*
 110  * Tracer channel attributes.
 111  */
 112 #define LTTNG_UST_CHANNEL_ATTR_PADDING  LTTNG_UST_SYM_NAME_LEN + 32
 113 struct lttng_ust_channel_attr {
 114         int overwrite;                          /* 1: overwrite, 0: discard */
 115         uint64_t subbuf_size;                   /* bytes */
 116         uint64_t num_subbuf;                    /* power of 2 */
 117         unsigned int switch_timer_interval;     /* usec */
 118         unsigned int read_timer_interval;       /* usec */
 119         enum lttng_ust_output output;           /* splice, mmap */
 120         char padding[LTTNG_UST_CHANNEL_ATTR_PADDING];
 121 };
 122
 123 #define LTTNG_UST_TRACEPOINT_ITER_PADDING       16
 124 struct lttng_ust_tracepoint_iter {
 125         char name[LTTNG_UST_SYM_NAME_LEN];      /* provider:name */
 126         int loglevel;
 127         char padding[LTTNG_UST_TRACEPOINT_ITER_PADDING];
 128 };
 129
 130 #define LTTNG_UST_OBJECT_DATA_PADDING           LTTNG_UST_SYM_NAME_LEN + 32
 131 struct lttng_ust_object_data {
 132         int handle;
 133         int shm_fd;
 134         char *shm_path;
 135         int wait_fd;
 136         char *wait_pipe_path;
 137         uint64_t memory_map_size;
 138         char padding[LTTNG_UST_OBJECT_DATA_PADDING];
 139 };
 140
 141 enum lttng_ust_calibrate_type {
 142         LTTNG_UST_CALIBRATE_TRACEPOINT,
 143 };
 144
 145 #define LTTNG_UST_CALIBRATE_PADDING1    16
 146 #define LTTNG_UST_CALIBRATE_PADDING2    LTTNG_UST_SYM_NAME_LEN + 32
 147 struct lttng_ust_calibrate {
 148         enum lttng_ust_calibrate_type type;     /* type (input) */
 149         char padding[LTTNG_UST_CALIBRATE_PADDING1];
 150
 151         union {
 152                 char padding[LTTNG_UST_CALIBRATE_PADDING2];
 153         } u;
 154 };
 155
 156 #define _UST_CMD(minor)                         (minor)
 157 #define _UST_CMDR(minor, type)                  (minor)
 158 #define _UST_CMDW(minor, type)                  (minor)
 159
 160 /* Handled by object descriptor */
 161 #define LTTNG_UST_RELEASE                       _UST_CMD(0x1)
 162
 163 /* Handled by object cmd */
 164
 165 /* LTTng-UST commands */
 166 #define LTTNG_UST_SESSION                       _UST_CMD(0x40)
 167 #define LTTNG_UST_TRACER_VERSION                \
 168         _UST_CMDR(0x41, struct lttng_ust_tracer_version)
 169 #define LTTNG_UST_TRACEPOINT_LIST               _UST_CMD(0x42)
 170 #define LTTNG_UST_WAIT_QUIESCENT                _UST_CMD(0x43)
 171 #define LTTNG_UST_REGISTER_DONE                 _UST_CMD(0x44)
 172
 173 /* Session FD commands */
 174 #define LTTNG_UST_METADATA                      \
 175         _UST_CMDW(0x50, struct lttng_ust_channel)
 176 #define LTTNG_UST_CHANNEL                       \
 177         _UST_CMDW(0x51, struct lttng_ust_channel)
 178 #define LTTNG_UST_SESSION_START                 _UST_CMD(0x52)
 179 #define LTTNG_UST_SESSION_STOP                  _UST_CMD(0x53)
 180
 181 /* Channel FD commands */
 182 #define LTTNG_UST_STREAM                        _UST_CMD(0x60)
 183 #define LTTNG_UST_EVENT                 \
 184         _UST_CMDW(0x61, struct lttng_ust_event)
 185
 186 /* Event and Channel FD commands */
 187 #define LTTNG_UST_CONTEXT                       \
 188         _UST_CMDW(0x70, struct lttng_ust_context)
 189 #define LTTNG_UST_FLUSH_BUFFER                  \
 190         _UST_CMD(0x71)
 191
 192 /* Event, Channel and Session commands */
 193 #define LTTNG_UST_ENABLE                        _UST_CMD(0x80)
 194 #define LTTNG_UST_DISABLE                       _UST_CMD(0x81)
 195
 196 /* Tracepoint list commands */
 197 #define LTTNG_UST_TRACEPOINT_LIST_GET           _UST_CMD(0x90)
 198
 199 #define LTTNG_UST_ROOT_HANDLE   0
 200
 201 struct lttng_ust_obj;
 202
 203 union ust_args {
 204         struct {
 205                 int *shm_fd;
 206                 char *shm_path;
 207                 int *wait_fd;
 208                 char *wait_pipe_path;
 209                 uint64_t *memory_map_size;
 210         } channel;
 211         struct {
 212                 int *shm_fd;
 213                 char *shm_path;
 214                 int *wait_fd;
 215                 char *wait_pipe_path;
 216                 uint64_t *memory_map_size;
 217         } stream;
 218 };
 219
 220 struct lttng_ust_objd_ops {
 221         long (*cmd)(int objd, unsigned int cmd, unsigned long arg,
 222                 union ust_args *args);
 223         int (*release)(int objd);
 224 };
 225
 226 /* Create root handle. Always ID 0. */
 227 int lttng_abi_create_root_handle(void);
 228
 229 const struct lttng_ust_objd_ops *objd_ops(int id);
 230 int lttng_ust_objd_unref(int id);
 231
 232 void lttng_ust_abi_exit(void);
 233 void lttng_ust_events_exit(void);
 234
 235 #endif /* _LTTNG_UST_ABI_H */