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  * 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 /* Version for comm protocol between sessiond and ust */
  27 #define LTTNG_UST_COMM_VERSION_MAJOR            2
  28 #define LTTNG_UST_COMM_VERSION_MINOR            0
  29
  30 /* Version for ABI between liblttng-ust, sessiond, consumerd */
  31 #define LTTNG_UST_INTERNAL_MAJOR_VERSION        3
  32 #define LTTNG_UST_INTERNAL_MINOR_VERSION        0
  33 #define LTTNG_UST_INTERNAL_PATCHLEVEL_VERSION   0
  34
  35 enum lttng_ust_instrumentation {
  36         LTTNG_UST_TRACEPOINT            = 0,
  37         LTTNG_UST_PROBE                 = 1,
  38         LTTNG_UST_FUNCTION              = 2,
  39 };
  40
  41 enum lttng_ust_loglevel_type {
  42         LTTNG_UST_LOGLEVEL_ALL          = 0,
  43         LTTNG_UST_LOGLEVEL_RANGE        = 1,
  44         LTTNG_UST_LOGLEVEL_SINGLE       = 2,
  45 };
  46
  47 enum lttng_ust_output {
  48         LTTNG_UST_MMAP          = 0,
  49 };
  50
  51 struct lttng_ust_tracer_version {
  52         uint32_t major;
  53         uint32_t minor;
  54         uint32_t patchlevel;
  55 };
  56
  57 #define LTTNG_UST_CHANNEL_PADDING       LTTNG_UST_SYM_NAME_LEN + 32
  58 struct lttng_ust_channel {
  59         int overwrite;                          /* 1: overwrite, 0: discard */
  60         uint64_t subbuf_size;                   /* in bytes */
  61         uint64_t num_subbuf;
  62         unsigned int switch_timer_interval;     /* usecs */
  63         unsigned int read_timer_interval;       /* usecs */
  64         enum lttng_ust_output output;           /* output mode */
  65         char padding[LTTNG_UST_CHANNEL_PADDING];
  66 };
  67
  68 #define LTTNG_UST_STREAM_PADDING1       16
  69 #define LTTNG_UST_STREAM_PADDING2       LTTNG_UST_SYM_NAME_LEN + 32
  70 struct lttng_ust_stream {
  71         char padding[LTTNG_UST_STREAM_PADDING1];
  72
  73         union {
  74                 char padding[LTTNG_UST_STREAM_PADDING2];
  75         } u;
  76 };
  77
  78 #define LTTNG_UST_EVENT_PADDING1        16
  79 #define LTTNG_UST_EVENT_PADDING2        LTTNG_UST_SYM_NAME_LEN + 32
  80 struct lttng_ust_event {
  81         enum lttng_ust_instrumentation instrumentation;
  82         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
  83
  84         enum lttng_ust_loglevel_type loglevel_type;
  85         int loglevel;   /* value, -1: all */
  86         char padding[LTTNG_UST_EVENT_PADDING1];
  87
  88         /* Per instrumentation type configuration */
  89         union {
  90                 char padding[LTTNG_UST_EVENT_PADDING2];
  91         } u;
  92 };
  93
  94 enum lttng_ust_field_type {
  95         LTTNG_UST_FIELD_OTHER                   = 0,
  96         LTTNG_UST_FIELD_INTEGER                 = 1,
  97         LTTNG_UST_FIELD_ENUM                    = 2,
  98         LTTNG_UST_FIELD_FLOAT                   = 3,
  99         LTTNG_UST_FIELD_STRING                  = 4,
 100 };
 101
 102 #define LTTNG_UST_FIELD_ITER_PADDING            LTTNG_UST_SYM_NAME_LEN + 28
 103 struct lttng_ust_field_iter {
 104         char event_name[LTTNG_UST_SYM_NAME_LEN];
 105         char field_name[LTTNG_UST_SYM_NAME_LEN];
 106         enum lttng_ust_field_type type;
 107         int loglevel;                           /* event loglevel */
 108         int written;
 109         char padding[LTTNG_UST_FIELD_ITER_PADDING];
 110 };
 111
 112 enum lttng_ust_context_type {
 113         LTTNG_UST_CONTEXT_VTID                  = 0,
 114         LTTNG_UST_CONTEXT_VPID                  = 1,
 115         LTTNG_UST_CONTEXT_PTHREAD_ID            = 2,
 116         LTTNG_UST_CONTEXT_PROCNAME              = 3,
 117 };
 118
 119 #define LTTNG_UST_CONTEXT_PADDING1      16
 120 #define LTTNG_UST_CONTEXT_PADDING2      LTTNG_UST_SYM_NAME_LEN + 32
 121 struct lttng_ust_context {
 122         enum lttng_ust_context_type ctx;
 123         char padding[LTTNG_UST_CONTEXT_PADDING1];
 124
 125         union {
 126                 char padding[LTTNG_UST_CONTEXT_PADDING2];
 127         } u;
 128 };
 129
 130 /*
 131  * Tracer channel attributes.
 132  */
 133 #define LTTNG_UST_CHANNEL_ATTR_PADDING  LTTNG_UST_SYM_NAME_LEN + 32
 134 struct lttng_ust_channel_attr {
 135         int overwrite;                          /* 1: overwrite, 0: discard */
 136         uint64_t subbuf_size;                   /* bytes */
 137         uint64_t num_subbuf;                    /* power of 2 */
 138         unsigned int switch_timer_interval;     /* usec */
 139         unsigned int read_timer_interval;       /* usec */
 140         enum lttng_ust_output output;           /* splice, mmap */
 141         char padding[LTTNG_UST_CHANNEL_ATTR_PADDING];
 142 };
 143
 144 #define LTTNG_UST_TRACEPOINT_ITER_PADDING       16
 145 struct lttng_ust_tracepoint_iter {
 146         char name[LTTNG_UST_SYM_NAME_LEN];      /* provider:name */
 147         int loglevel;
 148         char padding[LTTNG_UST_TRACEPOINT_ITER_PADDING];
 149 };
 150
 151 #define LTTNG_UST_OBJECT_DATA_PADDING           LTTNG_UST_SYM_NAME_LEN + 32
 152 struct lttng_ust_object_data {
 153         int handle;
 154         int shm_fd;
 155         int wait_fd;
 156         uint64_t memory_map_size;
 157         char padding[LTTNG_UST_OBJECT_DATA_PADDING];
 158 };
 159
 160 enum lttng_ust_calibrate_type {
 161         LTTNG_UST_CALIBRATE_TRACEPOINT,
 162 };
 163
 164 #define LTTNG_UST_CALIBRATE_PADDING1    16
 165 #define LTTNG_UST_CALIBRATE_PADDING2    LTTNG_UST_SYM_NAME_LEN + 32
 166 struct lttng_ust_calibrate {
 167         enum lttng_ust_calibrate_type type;     /* type (input) */
 168         char padding[LTTNG_UST_CALIBRATE_PADDING1];
 169
 170         union {
 171                 char padding[LTTNG_UST_CALIBRATE_PADDING2];
 172         } u;
 173 };
 174
 175 #define FILTER_BYTECODE_MAX_LEN         65536
 176 struct lttng_ust_filter_bytecode {
 177         uint32_t len;
 178         uint32_t reloc_offset;
 179         char data[0];
 180 };
 181
 182 #define _UST_CMD(minor)                         (minor)
 183 #define _UST_CMDR(minor, type)                  (minor)
 184 #define _UST_CMDW(minor, type)                  (minor)
 185
 186 /* Handled by object descriptor */
 187 #define LTTNG_UST_RELEASE                       _UST_CMD(0x1)
 188
 189 /* Handled by object cmd */
 190
 191 /* LTTng-UST commands */
 192 #define LTTNG_UST_SESSION                       _UST_CMD(0x40)
 193 #define LTTNG_UST_TRACER_VERSION                \
 194         _UST_CMDR(0x41, struct lttng_ust_tracer_version)
 195 #define LTTNG_UST_TRACEPOINT_LIST               _UST_CMD(0x42)
 196 #define LTTNG_UST_WAIT_QUIESCENT                _UST_CMD(0x43)
 197 #define LTTNG_UST_REGISTER_DONE                 _UST_CMD(0x44)
 198 #define LTTNG_UST_TRACEPOINT_FIELD_LIST         _UST_CMD(0x45)
 199
 200 /* Session FD commands */
 201 #define LTTNG_UST_METADATA                      \
 202         _UST_CMDW(0x50, struct lttng_ust_channel)
 203 #define LTTNG_UST_CHANNEL                       \
 204         _UST_CMDW(0x51, struct lttng_ust_channel)
 205 #define LTTNG_UST_SESSION_START                 _UST_CMD(0x52)
 206 #define LTTNG_UST_SESSION_STOP                  _UST_CMD(0x53)
 207
 208 /* Channel FD commands */
 209 #define LTTNG_UST_STREAM                        _UST_CMD(0x60)
 210 #define LTTNG_UST_EVENT                 \
 211         _UST_CMDW(0x61, struct lttng_ust_event)
 212
 213 /* Event and Channel FD commands */
 214 #define LTTNG_UST_CONTEXT                       \
 215         _UST_CMDW(0x70, struct lttng_ust_context)
 216 #define LTTNG_UST_FLUSH_BUFFER                  \
 217         _UST_CMD(0x71)
 218
 219 /* Event, Channel and Session commands */
 220 #define LTTNG_UST_ENABLE                        _UST_CMD(0x80)
 221 #define LTTNG_UST_DISABLE                       _UST_CMD(0x81)
 222
 223 /* Tracepoint list commands */
 224 #define LTTNG_UST_TRACEPOINT_LIST_GET           _UST_CMD(0x90)
 225 #define LTTNG_UST_TRACEPOINT_FIELD_LIST_GET     _UST_CMD(0x91)
 226
 227 /* Event FD commands */
 228 #define LTTNG_UST_FILTER                        _UST_CMD(0xA0)
 229
 230 #define LTTNG_UST_ROOT_HANDLE   0
 231
 232 struct lttng_ust_obj;
 233
 234 union ust_args {
 235         struct {
 236                 int *shm_fd;
 237                 int *wait_fd;
 238                 uint64_t *memory_map_size;
 239         } channel;
 240         struct {
 241                 int *shm_fd;
 242                 int *wait_fd;
 243                 uint64_t *memory_map_size;
 244         } stream;
 245         struct {
 246                 struct lttng_ust_field_iter entry;
 247         } field_list;
 248 };
 249
 250 struct lttng_ust_objd_ops {
 251         long (*cmd)(int objd, unsigned int cmd, unsigned long arg,
 252                 union ust_args *args);
 253         int (*release)(int objd);
 254 };
 255
 256 /* Create root handle. Always ID 0. */
 257 int lttng_abi_create_root_handle(void);
 258
 259 const struct lttng_ust_objd_ops *objd_ops(int id);
 260 int lttng_ust_objd_unref(int id);
 261
 262 void lttng_ust_abi_exit(void);
 263 void lttng_ust_events_exit(void);
 264
 265 #endif /* _LTTNG_UST_ABI_H */