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  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  26  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  */
  29
  30 #include <stdint.h>
  31
  32 #define lttng_ust_notrace __attribute__((no_instrument_function))
  33 #define LTTNG_PACKED    __attribute__((__packed__))
  34
  35 #ifndef __ust_stringify
  36 #define __ust_stringify1(x)     #x
  37 #define __ust_stringify(x)      __ust_stringify1(x)
  38 #endif /* __ust_stringify */
  39
  40 #define LTTNG_UST_SYM_NAME_LEN                  256
  41 #define LTTNG_UST_ABI_PROCNAME_LEN              16
  42
  43 /* UST comm magic number, used to validate protocol and endianness. */
  44 #define LTTNG_UST_COMM_MAGIC                    0xC57C57C5
  45
  46 /* Version for ABI between liblttng-ust, sessiond, consumerd */
  47 #define LTTNG_UST_ABI_MAJOR_VERSION             7
  48 #define LTTNG_UST_ABI_MINOR_VERSION             2
  49
  50 struct lttng_ust_calibrate;
  51
  52 enum lttng_ust_instrumentation {
  53         LTTNG_UST_TRACEPOINT            = 0,
  54         LTTNG_UST_PROBE                 = 1,
  55         LTTNG_UST_FUNCTION              = 2,
  56 };
  57
  58 enum lttng_ust_loglevel_type {
  59         LTTNG_UST_LOGLEVEL_ALL          = 0,
  60         LTTNG_UST_LOGLEVEL_RANGE        = 1,
  61         LTTNG_UST_LOGLEVEL_SINGLE       = 2,
  62 };
  63
  64 enum lttng_ust_output {
  65         LTTNG_UST_MMAP          = 0,
  66 };
  67
  68 enum lttng_ust_chan_type {
  69         LTTNG_UST_CHAN_PER_CPU = 0,
  70         LTTNG_UST_CHAN_METADATA = 1,
  71 };
  72
  73 struct lttng_ust_tracer_version {
  74         uint32_t major;
  75         uint32_t minor;
  76         uint32_t patchlevel;
  77 } LTTNG_PACKED;
  78
  79 #define LTTNG_UST_CHANNEL_PADDING       (LTTNG_UST_SYM_NAME_LEN + 32)
  80 /*
  81  * Given that the consumerd is limited to 64k file descriptors, we
  82  * cannot expect much more than 1MB channel structure size. This size is
  83  * depends on the number of streams within a channel, which depends on
  84  * the number of possible CPUs on the system.
  85  */
  86 #define LTTNG_UST_CHANNEL_DATA_MAX_LEN  1048576U
  87 struct lttng_ust_channel {
  88         uint64_t len;
  89         enum lttng_ust_chan_type type;
  90         char padding[LTTNG_UST_CHANNEL_PADDING];
  91         char data[];    /* variable sized data */
  92 } LTTNG_PACKED;
  93
  94 #define LTTNG_UST_STREAM_PADDING1       (LTTNG_UST_SYM_NAME_LEN + 32)
  95 struct lttng_ust_stream {
  96         uint64_t len;           /* shm len */
  97         uint32_t stream_nr;     /* stream number */
  98         char padding[LTTNG_UST_STREAM_PADDING1];
  99         /*
 100          * shm_fd and wakeup_fd are send over unix socket as file
 101          * descriptors after this structure.
 102          */
 103 } LTTNG_PACKED;
 104
 105 #define LTTNG_UST_EVENT_PADDING1        16
 106 #define LTTNG_UST_EVENT_PADDING2        (LTTNG_UST_SYM_NAME_LEN + 32)
 107 struct lttng_ust_event {
 108         enum lttng_ust_instrumentation instrumentation;
 109         char name[LTTNG_UST_SYM_NAME_LEN];      /* event name */
 110
 111         enum lttng_ust_loglevel_type loglevel_type;
 112         int loglevel;   /* value, -1: all */
 113         char padding[LTTNG_UST_EVENT_PADDING1];
 114
 115         /* Per instrumentation type configuration */
 116         union {
 117                 char padding[LTTNG_UST_EVENT_PADDING2];
 118         } u;
 119 } LTTNG_PACKED;
 120
 121 enum lttng_ust_field_type {
 122         LTTNG_UST_FIELD_OTHER                   = 0,
 123         LTTNG_UST_FIELD_INTEGER                 = 1,
 124         LTTNG_UST_FIELD_ENUM                    = 2,
 125         LTTNG_UST_FIELD_FLOAT                   = 3,
 126         LTTNG_UST_FIELD_STRING                  = 4,
 127 };
 128
 129 #define LTTNG_UST_FIELD_ITER_PADDING    (LTTNG_UST_SYM_NAME_LEN + 28)
 130 struct lttng_ust_field_iter {
 131         char event_name[LTTNG_UST_SYM_NAME_LEN];
 132         char field_name[LTTNG_UST_SYM_NAME_LEN];
 133         enum lttng_ust_field_type type;
 134         int loglevel;                           /* event loglevel */
 135         int nowrite;
 136         char padding[LTTNG_UST_FIELD_ITER_PADDING];
 137 } LTTNG_PACKED;
 138
 139 enum lttng_ust_context_type {
 140         LTTNG_UST_CONTEXT_VTID                  = 0,
 141         LTTNG_UST_CONTEXT_VPID                  = 1,
 142         LTTNG_UST_CONTEXT_PTHREAD_ID            = 2,
 143         LTTNG_UST_CONTEXT_PROCNAME              = 3,
 144         LTTNG_UST_CONTEXT_IP                    = 4,
 145         LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER   = 5,
 146         LTTNG_UST_CONTEXT_CPU_ID                = 6,
 147         LTTNG_UST_CONTEXT_APP_CONTEXT           = 7,
 148 };
 149
 150 struct lttng_ust_perf_counter_ctx {
 151         uint32_t type;
 152         uint64_t config;
 153         char name[LTTNG_UST_SYM_NAME_LEN];
 154 } LTTNG_PACKED;
 155
 156 #define LTTNG_UST_CONTEXT_PADDING1      16
 157 #define LTTNG_UST_CONTEXT_PADDING2      (LTTNG_UST_SYM_NAME_LEN + 32)
 158 struct lttng_ust_context {
 159         enum lttng_ust_context_type ctx;
 160         char padding[LTTNG_UST_CONTEXT_PADDING1];
 161
 162         union {
 163                 struct lttng_ust_perf_counter_ctx perf_counter;
 164                 struct {
 165                         /* Includes trailing '\0'. */
 166                         uint32_t provider_name_len;
 167                         uint32_t ctx_name_len;
 168                 } app_ctx;
 169                 char padding[LTTNG_UST_CONTEXT_PADDING2];
 170         } u;
 171 } LTTNG_PACKED;
 172
 173 /*
 174  * Tracer channel attributes.
 175  */
 176 #define LTTNG_UST_CHANNEL_ATTR_PADDING  (LTTNG_UST_SYM_NAME_LEN + 32)
 177 struct lttng_ust_channel_attr {
 178         uint64_t subbuf_size;                   /* bytes, power of 2 */
 179         uint64_t num_subbuf;                    /* power of 2 */
 180         int overwrite;                          /* 1: overwrite, 0: discard */
 181         unsigned int switch_timer_interval;     /* usec */
 182         unsigned int read_timer_interval;       /* usec */
 183         enum lttng_ust_output output;           /* splice, mmap */
 184         union {
 185                 struct {
 186                         int64_t blocking_timeout;       /* Retry timeout (usec) */
 187                 } s;
 188                 char padding[LTTNG_UST_CHANNEL_ATTR_PADDING];
 189         } u;
 190 } LTTNG_PACKED;
 191
 192 #define LTTNG_UST_TRACEPOINT_ITER_PADDING       16
 193 struct lttng_ust_tracepoint_iter {
 194         char name[LTTNG_UST_SYM_NAME_LEN];      /* provider:name */
 195         int loglevel;
 196         char padding[LTTNG_UST_TRACEPOINT_ITER_PADDING];
 197 } LTTNG_PACKED;
 198
 199 enum lttng_ust_object_type {
 200         LTTNG_UST_OBJECT_TYPE_UNKNOWN = -1,
 201         LTTNG_UST_OBJECT_TYPE_CHANNEL = 0,
 202         LTTNG_UST_OBJECT_TYPE_STREAM = 1,
 203         LTTNG_UST_OBJECT_TYPE_EVENT = 2,
 204         LTTNG_UST_OBJECT_TYPE_CONTEXT = 3,
 205 };
 206
 207 #define LTTNG_UST_OBJECT_DATA_PADDING1  32
 208 #define LTTNG_UST_OBJECT_DATA_PADDING2  (LTTNG_UST_SYM_NAME_LEN + 32)
 209
 210 struct lttng_ust_object_data {
 211         enum lttng_ust_object_type type;
 212         int handle;
 213         uint64_t size;
 214         char padding1[LTTNG_UST_OBJECT_DATA_PADDING1];
 215         union {
 216                 struct {
 217                         void *data;
 218                         enum lttng_ust_chan_type type;
 219                         int wakeup_fd;
 220                 } channel;
 221                 struct {
 222                         int shm_fd;
 223                         int wakeup_fd;
 224                         uint32_t stream_nr;
 225                 } stream;
 226                 char padding2[LTTNG_UST_OBJECT_DATA_PADDING2];
 227         } u;
 228 } LTTNG_PACKED;
 229
 230 #define FILTER_BYTECODE_MAX_LEN         65536
 231 #define LTTNG_UST_FILTER_PADDING        32
 232 struct lttng_ust_filter_bytecode {
 233         uint32_t len;
 234         uint32_t reloc_offset;
 235         uint64_t seqnum;
 236         char padding[LTTNG_UST_FILTER_PADDING];
 237         char data[0];
 238 } LTTNG_PACKED;
 239
 240 #define LTTNG_UST_EXCLUSION_PADDING     32
 241 struct lttng_ust_event_exclusion {
 242         uint32_t count;
 243         char padding[LTTNG_UST_EXCLUSION_PADDING];
 244         char names[LTTNG_UST_SYM_NAME_LEN][0];
 245 } LTTNG_PACKED;
 246
 247 #define _UST_CMD(minor)                         (minor)
 248 #define _UST_CMDR(minor, type)                  (minor)
 249 #define _UST_CMDW(minor, type)                  (minor)
 250
 251 /* Handled by object descriptor */
 252 #define LTTNG_UST_RELEASE                       _UST_CMD(0x1)
 253
 254 /* Handled by object cmd */
 255
 256 /* LTTng-UST commands */
 257 #define LTTNG_UST_SESSION                       _UST_CMD(0x40)
 258 #define LTTNG_UST_TRACER_VERSION                \
 259         _UST_CMDR(0x41, struct lttng_ust_tracer_version)
 260 #define LTTNG_UST_TRACEPOINT_LIST               _UST_CMD(0x42)
 261 #define LTTNG_UST_WAIT_QUIESCENT                _UST_CMD(0x43)
 262 #define LTTNG_UST_REGISTER_DONE                 _UST_CMD(0x44)
 263 #define LTTNG_UST_TRACEPOINT_FIELD_LIST         _UST_CMD(0x45)
 264
 265 /* Session FD commands */
 266 #define LTTNG_UST_CHANNEL                       \
 267         _UST_CMDW(0x51, struct lttng_ust_channel)
 268 #define LTTNG_UST_SESSION_START                 _UST_CMD(0x52)
 269 #define LTTNG_UST_SESSION_STOP                  _UST_CMD(0x53)
 270 #define LTTNG_UST_SESSION_STATEDUMP             _UST_CMD(0x54)
 271
 272 /* Channel FD commands */
 273 #define LTTNG_UST_STREAM                        _UST_CMD(0x60)
 274 #define LTTNG_UST_EVENT                 \
 275         _UST_CMDW(0x61, struct lttng_ust_event)
 276
 277 /* Event and Channel FD commands */
 278 #define LTTNG_UST_CONTEXT                       \
 279         _UST_CMDW(0x70, struct lttng_ust_context)
 280 #define LTTNG_UST_FLUSH_BUFFER                  \
 281         _UST_CMD(0x71)
 282
 283 /* Event, Channel and Session commands */
 284 #define LTTNG_UST_ENABLE                        _UST_CMD(0x80)
 285 #define LTTNG_UST_DISABLE                       _UST_CMD(0x81)
 286
 287 /* Tracepoint list commands */
 288 #define LTTNG_UST_TRACEPOINT_LIST_GET           _UST_CMD(0x90)
 289 #define LTTNG_UST_TRACEPOINT_FIELD_LIST_GET     _UST_CMD(0x91)
 290
 291 /* Event FD commands */
 292 #define LTTNG_UST_FILTER                        _UST_CMD(0xA0)
 293
 294 #define LTTNG_UST_ROOT_HANDLE   0
 295
 296 struct lttng_ust_obj;
 297
 298 union ust_args {
 299         struct {
 300                 void *chan_data;
 301                 int wakeup_fd;
 302         } channel;
 303         struct {
 304                 int shm_fd;
 305                 int wakeup_fd;
 306         } stream;
 307         struct {
 308                 struct lttng_ust_field_iter entry;
 309         } field_list;
 310 };
 311
 312 struct lttng_ust_objd_ops {
 313         long (*cmd)(int objd, unsigned int cmd, unsigned long arg,
 314                 union ust_args *args, void *owner);
 315         int (*release)(int objd);
 316 };
 317
 318 /* Create root handle. Always ID 0. */
 319 int lttng_abi_create_root_handle(void);
 320
 321 const struct lttng_ust_objd_ops *objd_ops(int id);
 322 int lttng_ust_objd_unref(int id, int is_owner);
 323
 324 void lttng_ust_abi_exit(void);
 325 void lttng_ust_events_exit(void);
 326 void lttng_ust_objd_table_owner_cleanup(void *owner);
 327
 328 #endif /* _LTTNG_UST_ABI_H */