probes/lttng-events.h

   1 /*
   2  * lttng-events.h
   3  *
   4  * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
   5  * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * Dual LGPL v2.1/GPL v2 license.
   8  */
   9
  10 #include <linux/debugfs.h>
  11 #include "lttng.h"
  12 #include "lttng-types.h"
  13 #include "../wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
  14 #include "../wrapper/ringbuffer/frontend_types.h"
  15 #include "../ltt-events.h"
  16 #include "../ltt-tracer-core.h"
  17
  18 /*
  19  * Macro declarations used for all stages.
  20  */
  21
  22 /*
  23  * DECLARE_EVENT_CLASS can be used to add a generic function
  24  * handlers for events. That is, if all events have the same
  25  * parameters and just have distinct trace points.
  26  * Each tracepoint can be defined with DEFINE_EVENT and that
  27  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  28  *
  29  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  30  */
  31
  32 #undef TRACE_EVENT
  33 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  34         DECLARE_EVENT_CLASS(name,                              \
  35                              PARAMS(proto),                    \
  36                              PARAMS(args),                     \
  37                              PARAMS(tstruct),                  \
  38                              PARAMS(assign),                   \
  39                              PARAMS(print))                    \
  40         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args))
  41
  42 #undef TRACE_EVENT_NOARGS
  43 #define TRACE_EVENT_NOARGS(name, tstruct, assign, print)       \
  44         DECLARE_EVENT_CLASS_NOARGS(name,                       \
  45                              PARAMS(tstruct),                  \
  46                              PARAMS(assign),                   \
  47                              PARAMS(print))                    \
  48         DEFINE_EVENT_NOARGS(name, name)
  49
  50
  51 #undef DEFINE_EVENT_PRINT
  52 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  53         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  54
  55 /* Callbacks are meaningless to LTTng. */
  56 #undef TRACE_EVENT_FN
  57 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  58                 assign, print, reg, unreg)                              \
  59         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
  60                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
  61
  62 /*
  63  * Stage 1 of the trace events.
  64  *
  65  * Create dummy trace calls for each events, verifying that the LTTng module
  66  * TRACE_EVENT headers match the kernel arguments. Will be optimized out by the
  67  * compiler.
  68  */
  69
  70 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
  71
  72 #undef TP_PROTO
  73 #define TP_PROTO(args...) args
  74
  75 #undef TP_ARGS
  76 #define TP_ARGS(args...) args
  77
  78 #undef DEFINE_EVENT
  79 #define DEFINE_EVENT(_template, _name, _proto, _args)                   \
  80 void trace_##_name(_proto);
  81
  82 #undef DEFINE_EVENT_NOARGS
  83 #define DEFINE_EVENT_NOARGS(_template, _name)                           \
  84 void trace_##_name(void *__data);
  85
  86 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  87
  88 /*
  89  * Stage 2 of the trace events.
  90  *
  91  * Create event field type metadata section.
  92  * Each event produce an array of fields.
  93  */
  94
  95 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
  96
  97 /* Named field types must be defined in lttng-types.h */
  98
  99 #undef __field_full
 100 #define __field_full(_type, _item, _order, _base)               \
 101         {                                                       \
 102           .name = #_item,                                       \
 103           .type = __type_integer(_type, _order, _base, none),   \
 104         },
 105
 106 #undef __field
 107 #define __field(_type, _item)                                   \
 108         __field_full(_type, _item, __BYTE_ORDER, 10)
 109
 110 #undef __field_ext
 111 #define __field_ext(_type, _item, _filter_type)                 \
 112         __field(_type, _item)
 113
 114 #undef __field_hex
 115 #define __field_hex(_type, _item)                               \
 116         __field_full(_type, _item, __BYTE_ORDER, 16)
 117
 118 #undef __field_network
 119 #define __field_network(_type, _item)                           \
 120         __field_full(_type, _item, __BIG_ENDIAN, 10)
 121
 122 #undef __field_network_hex
 123 #define __field_network_hex(_type, _item)                               \
 124         __field_full(_type, _item, __BIG_ENDIAN, 16)
 125
 126 #undef __array_enc_ext
 127 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 128         {                                                       \
 129           .name = #_item,                                       \
 130           .type =                                               \
 131                 {                                               \
 132                   .atype = atype_array,                         \
 133                   .u.array =                                    \
 134                         {                                       \
 135                             .length = _length,                  \
 136                             .elem_type = __type_integer(_type, _order, _base, _encoding), \
 137                         },                                      \
 138                 },                                              \
 139         },
 140
 141 #undef __array
 142 #define __array(_type, _item, _length)                          \
 143         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
 144
 145 #undef __array_text
 146 #define __array_text(_type, _item, _length)                     \
 147         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
 148
 149 #undef __array_hex
 150 #define __array_hex(_type, _item, _length)                      \
 151         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
 152
 153 #undef __dynamic_array_enc_ext
 154 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
 155         {                                                       \
 156           .name = #_item,                                       \
 157           .type =                                               \
 158                 {                                               \
 159                   .atype = atype_sequence,                      \
 160                   .u.sequence =                                 \
 161                         {                                       \
 162                             .length_type = __type_integer(u32, __BYTE_ORDER, 10, none), \
 163                             .elem_type = __type_integer(_type, _order, _base, _encoding), \
 164                         },                                      \
 165                 },                                              \
 166         },
 167
 168 #undef __dynamic_array
 169 #define __dynamic_array(_type, _item, _length)                  \
 170         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
 171
 172 #undef __dynamic_array_text
 173 #define __dynamic_array_text(_type, _item, _length)             \
 174         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
 175
 176 #undef __dynamic_array_hex
 177 #define __dynamic_array_hex(_type, _item, _length)              \
 178         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
 179
 180 #undef __string
 181 #define __string(_item, _src)                                   \
 182         {                                                       \
 183           .name = #_item,                                       \
 184           .type =                                               \
 185                 {                                               \
 186                   .atype = atype_string,                        \
 187                   .u.basic.string.encoding = lttng_encode_UTF8, \
 188                 },                                              \
 189         },
 190
 191 #undef __string_from_user
 192 #define __string_from_user(_item, _src)                         \
 193         __string(_item, _src)
 194
 195 #undef TP_STRUCT__entry
 196 #define TP_STRUCT__entry(args...) args  /* Only one used in this phase */
 197
 198 #undef DECLARE_EVENT_CLASS_NOARGS
 199 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
 200         static const struct lttng_event_field __event_fields___##_name[] = { \
 201                 _tstruct                                                     \
 202         };
 203
 204 #undef DECLARE_EVENT_CLASS
 205 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
 206         DECLARE_EVENT_CLASS_NOARGS(_name, PARAMS(_tstruct), PARAMS(_assign), \
 207                         PARAMS(_print))
 208
 209 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 210
 211 /*
 212  * Stage 3 of the trace events.
 213  *
 214  * Create probe callback prototypes.
 215  */
 216
 217 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 218
 219 #undef TP_PROTO
 220 #define TP_PROTO(args...) args
 221
 222 #undef DECLARE_EVENT_CLASS
 223 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 224 static void __event_probe__##_name(void *__data, _proto);
 225
 226 #undef DECLARE_EVENT_CLASS_NOARGS
 227 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print)          \
 228 static void __event_probe__##_name(void *__data);
 229
 230 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 231
 232 /*
 233  * Stage 3.9 of the trace events.
 234  *
 235  * Create event descriptions.
 236  */
 237
 238 /* Named field types must be defined in lttng-types.h */
 239
 240 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 241
 242 #ifndef TP_PROBE_CB
 243 #define TP_PROBE_CB(_template)  &__event_probe__##_template
 244 #endif
 245
 246 #undef DEFINE_EVENT_NOARGS
 247 #define DEFINE_EVENT_NOARGS(_template, _name)                           \
 248 static const struct lttng_event_desc __event_desc___##_name = {         \
 249         .fields = __event_fields___##_template,                         \
 250         .name = #_name,                                                 \
 251         .probe_callback = (void *) TP_PROBE_CB(_template),              \
 252         .nr_fields = ARRAY_SIZE(__event_fields___##_template),          \
 253         .owner = THIS_MODULE,                                           \
 254 };
 255
 256 #undef DEFINE_EVENT
 257 #define DEFINE_EVENT(_template, _name, _proto, _args)                   \
 258         DEFINE_EVENT_NOARGS(_template, _name)
 259
 260 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 261
 262
 263 /*
 264  * Stage 4 of the trace events.
 265  *
 266  * Create an array of event description pointers.
 267  */
 268
 269 /* Named field types must be defined in lttng-types.h */
 270
 271 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 272
 273 #undef DEFINE_EVENT_NOARGS
 274 #define DEFINE_EVENT_NOARGS(_template, _name)                                  \
 275                 &__event_desc___##_name,
 276
 277 #undef DEFINE_EVENT
 278 #define DEFINE_EVENT(_template, _name, _proto, _args)                          \
 279         DEFINE_EVENT_NOARGS(_template, _name)
 280
 281 #define TP_ID1(_token, _system) _token##_system
 282 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 283
 284 static const struct lttng_event_desc *TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
 285 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 286 };
 287
 288 #undef TP_ID1
 289 #undef TP_ID
 290
 291
 292 /*
 293  * Stage 5 of the trace events.
 294  *
 295  * Create a toplevel descriptor for the whole probe.
 296  */
 297
 298 #define TP_ID1(_token, _system) _token##_system
 299 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 300
 301 /* non-const because list head will be modified when registered. */
 302 static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = {
 303         .event_desc = TP_ID(__event_desc___, TRACE_SYSTEM),
 304         .nr_events = ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)),
 305 };
 306
 307 #undef TP_ID1
 308 #undef TP_ID
 309
 310 /*
 311  * Stage 6 of the trace events.
 312  *
 313  * Create static inline function that calculates event size.
 314  */
 315
 316 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 317
 318 /* Named field types must be defined in lttng-types.h */
 319
 320 #undef __field_full
 321 #define __field_full(_type, _item, _order, _base)                              \
 322         __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
 323         __event_len += sizeof(_type);
 324
 325 #undef __array_enc_ext
 326 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)       \
 327         __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
 328         __event_len += sizeof(_type) * (_length);
 329
 330 #undef __dynamic_array_enc_ext
 331 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 332         __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(u32));   \
 333         __event_len += sizeof(u32);                                            \
 334         __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
 335         __dynamic_len[__dynamic_len_idx] = (_length);                          \
 336         __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx];       \
 337         __dynamic_len_idx++;
 338
 339 #undef __string
 340 #define __string(_item, _src)                                                  \
 341         __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
 342
 343 /*
 344  * strlen_user includes \0. If returns 0, it faulted, so we set size to
 345  * 1 (\0 only).
 346  */
 347 #undef __string_from_user
 348 #define __string_from_user(_item, _src)                                        \
 349         __event_len += __dynamic_len[__dynamic_len_idx++] =                    \
 350                 max_t(size_t, strlen_user(_src), 1);
 351
 352 #undef TP_PROTO
 353 #define TP_PROTO(args...) args
 354
 355 #undef TP_STRUCT__entry
 356 #define TP_STRUCT__entry(args...) args
 357
 358 #undef DECLARE_EVENT_CLASS
 359 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 360 static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \
 361 {                                                                             \
 362         size_t __event_len = 0;                                               \
 363         unsigned int __dynamic_len_idx = 0;                                   \
 364                                                                               \
 365         if (0)                                                                \
 366                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 367         _tstruct                                                              \
 368         return __event_len;                                                   \
 369 }
 370
 371 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 372
 373 /*
 374  * Stage 7 of the trace events.
 375  *
 376  * Create static inline function that calculates event payload alignment.
 377  */
 378
 379 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 380
 381 /* Named field types must be defined in lttng-types.h */
 382
 383 #undef __field_full
 384 #define __field_full(_type, _item, _order, _base)                         \
 385         __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
 386
 387 #undef __array_enc_ext
 388 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)  \
 389         __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
 390
 391 #undef __dynamic_array_enc_ext
 392 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 393         __event_align = max_t(size_t, __event_align, ltt_alignof(u32));   \
 394         __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
 395
 396 #undef __string
 397 #define __string(_item, _src)
 398
 399 #undef __string_from_user
 400 #define __string_from_user(_item, _src)
 401
 402 #undef TP_PROTO
 403 #define TP_PROTO(args...) args
 404
 405 #undef TP_STRUCT__entry
 406 #define TP_STRUCT__entry(args...) args
 407
 408 #undef DECLARE_EVENT_CLASS
 409 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 410 static inline size_t __event_get_align__##_name(_proto)                       \
 411 {                                                                             \
 412         size_t __event_align = 1;                                             \
 413         _tstruct                                                              \
 414         return __event_align;                                                 \
 415 }
 416
 417 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 418
 419
 420 /*
 421  * Stage 8 of the trace events.
 422  *
 423  * Create structure declaration that allows the "assign" macros to access the
 424  * field types.
 425  */
 426
 427 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 428
 429 /* Named field types must be defined in lttng-types.h */
 430
 431 #undef __field_full
 432 #define __field_full(_type, _item, _order, _base)       _type   _item;
 433
 434 #undef __array_enc_ext
 435 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)  \
 436         _type   _item;
 437
 438 #undef __dynamic_array_enc_ext
 439 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 440         _type   _item;
 441
 442 #undef __string
 443 #define __string(_item, _src)                   char _item;
 444
 445 #undef __string_from_user
 446 #define __string_from_user(_item, _src)         \
 447         __string(_item, _src)
 448
 449 #undef TP_STRUCT__entry
 450 #define TP_STRUCT__entry(args...) args
 451
 452 #undef DECLARE_EVENT_CLASS
 453 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 454 struct __event_typemap__##_name {                                             \
 455         _tstruct                                                              \
 456 };
 457
 458 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 459
 460
 461 /*
 462  * Stage 9 of the trace events.
 463  *
 464  * Create the probe function : call even size calculation and write event data
 465  * into the buffer.
 466  *
 467  * We use both the field and assignment macros to write the fields in the order
 468  * defined in the field declaration. The field declarations control the
 469  * execution order, jumping to the appropriate assignment block.
 470  */
 471
 472 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 473
 474 #undef __field_full
 475 #define __field_full(_type, _item, _order, _base)                       \
 476         goto __assign_##_item;                                          \
 477 __end_field_##_item:
 478
 479 #undef __array_enc_ext
 480 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 481         goto __assign_##_item;                                          \
 482 __end_field_##_item:
 483
 484 #undef __dynamic_array_enc_ext
 485 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 486         goto __assign_##_item##_1;                                      \
 487 __end_field_##_item##_1:                                                \
 488         goto __assign_##_item##_2;                                      \
 489 __end_field_##_item##_2:
 490
 491 #undef __string
 492 #define __string(_item, _src)                                           \
 493         goto __assign_##_item;                                          \
 494 __end_field_##_item:
 495
 496 #undef __string_from_user
 497 #define __string_from_user(_item, _src)                                 \
 498         __string(_item, _src)
 499
 500 /*
 501  * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
 502  * strcpy().
 503  */
 504 #undef tp_assign
 505 #define tp_assign(dest, src)                                            \
 506 __assign_##dest:                                                        \
 507         {                                                               \
 508                 __typeof__(__typemap.dest) __tmp = (src);               \
 509                 lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__tmp));  \
 510                 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
 511         }                                                               \
 512         goto __end_field_##dest;
 513
 514 #undef tp_memcpy
 515 #define tp_memcpy(dest, src, len)                                       \
 516 __assign_##dest:                                                        \
 517         if (0)                                                          \
 518                 (void) __typemap.dest;                                  \
 519         lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
 520         __chan->ops->event_write(&__ctx, src, len);                     \
 521         goto __end_field_##dest;
 522
 523 #undef tp_memcpy_dyn
 524 #define tp_memcpy_dyn(dest, src)                                        \
 525 __assign_##dest##_1:                                                    \
 526         {                                                               \
 527                 u32 __tmpl = __dynamic_len[__dynamic_len_idx];          \
 528                 lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(u32));    \
 529                 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \
 530         }                                                               \
 531         goto __end_field_##dest##_1;                                    \
 532 __assign_##dest##_2:                                                    \
 533         lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
 534         __chan->ops->event_write(&__ctx, src,                           \
 535                 sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\
 536         goto __end_field_##dest##_2;
 537
 538 #undef tp_memcpy_from_user
 539 #define tp_memcpy_from_user(dest, src, len)                             \
 540         __assign_##dest:                                                \
 541         if (0)                                                          \
 542                 (void) __typemap.dest;                                  \
 543         lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
 544         __chan->ops->event_write_from_user(&__ctx, src, len);           \
 545         goto __end_field_##dest;
 546
 547 /*
 548  * The string length including the final \0.
 549  */
 550 #undef tp_copy_string_from_user
 551 #define tp_copy_string_from_user(dest, src)                             \
 552         __assign_##dest:                                                \
 553         {                                                               \
 554                 size_t __ustrlen;                                       \
 555                                                                         \
 556                 if (0)                                                  \
 557                         (void) __typemap.dest;                          \
 558                 lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest));\
 559                 __ustrlen = __get_dynamic_array_len(dest);              \
 560                 if (likely(__ustrlen > 1)) {                            \
 561                         __chan->ops->event_write_from_user(&__ctx, src, \
 562                                 __ustrlen - 1);                         \
 563                 }                                                       \
 564                 __chan->ops->event_memset(&__ctx, 0, 1);                \
 565         }                                                               \
 566         goto __end_field_##dest;
 567 #undef tp_strcpy
 568 #define tp_strcpy(dest, src)                                            \
 569         tp_memcpy(dest, src, __get_dynamic_array_len(dest))
 570
 571 /* Named field types must be defined in lttng-types.h */
 572
 573 #undef __get_str
 574 #define __get_str(field)                field
 575
 576 #undef __get_dynamic_array
 577 #define __get_dynamic_array(field)      field
 578
 579 /* Beware: this get len actually consumes the len value */
 580 #undef __get_dynamic_array_len
 581 #define __get_dynamic_array_len(field)  __dynamic_len[__dynamic_len_idx++]
 582
 583 #undef TP_PROTO
 584 #define TP_PROTO(args...) args
 585
 586 #undef TP_ARGS
 587 #define TP_ARGS(args...) args
 588
 589 #undef TP_STRUCT__entry
 590 #define TP_STRUCT__entry(args...) args
 591
 592 #undef TP_fast_assign
 593 #define TP_fast_assign(args...) args
 594
 595 #undef DECLARE_EVENT_CLASS
 596 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 597 static void __event_probe__##_name(void *__data, _proto)                      \
 598 {                                                                             \
 599         struct ltt_event *__event = __data;                                   \
 600         struct ltt_channel *__chan = __event->chan;                           \
 601         struct lib_ring_buffer_ctx __ctx;                                     \
 602         size_t __event_len, __event_align;                                    \
 603         size_t __dynamic_len_idx = 0;                                         \
 604         size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)];           \
 605         struct __event_typemap__##_name __typemap;                            \
 606         int __ret;                                                            \
 607                                                                               \
 608         if (0)                                                                \
 609                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 610         if (unlikely(!ACCESS_ONCE(__chan->session->active)))                  \
 611                 return;                                                       \
 612         if (unlikely(!ACCESS_ONCE(__chan->enabled)))                          \
 613                 return;                                                       \
 614         if (unlikely(!ACCESS_ONCE(__event->enabled)))                         \
 615                 return;                                                       \
 616         __event_len = __event_get_size__##_name(__dynamic_len, _args);        \
 617         __event_align = __event_get_align__##_name(_args);                    \
 618         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 619                                  __event_align, -1);                          \
 620         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 621         if (__ret < 0)                                                        \
 622                 return;                                                       \
 623         /* Control code (field ordering) */                                   \
 624         _tstruct                                                              \
 625         __chan->ops->event_commit(&__ctx);                                    \
 626         return;                                                               \
 627         /* Copy code, steered by control code */                              \
 628         _assign                                                               \
 629 }
 630
 631 #undef DECLARE_EVENT_CLASS_NOARGS
 632 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print)          \
 633 static void __event_probe__##_name(void *__data)                              \
 634 {                                                                             \
 635         struct ltt_event *__event = __data;                                   \
 636         struct ltt_channel *__chan = __event->chan;                           \
 637         struct lib_ring_buffer_ctx __ctx;                                     \
 638         size_t __event_len, __event_align;                                    \
 639         int __ret;                                                            \
 640                                                                               \
 641         if (unlikely(!ACCESS_ONCE(__chan->session->active)))                  \
 642                 return;                                                       \
 643         if (unlikely(!ACCESS_ONCE(__chan->enabled)))                          \
 644                 return;                                                       \
 645         if (unlikely(!ACCESS_ONCE(__event->enabled)))                         \
 646                 return;                                                       \
 647         __event_len = 0;                                                      \
 648         __event_align = 1;                                                    \
 649         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 650                                  __event_align, -1);                          \
 651         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 652         if (__ret < 0)                                                        \
 653                 return;                                                       \
 654         /* Control code (field ordering) */                                   \
 655         _tstruct                                                              \
 656         __chan->ops->event_commit(&__ctx);                                    \
 657         return;                                                               \
 658         /* Copy code, steered by control code */                              \
 659         _assign                                                               \
 660 }
 661
 662 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 663
 664 /*
 665  * Stage 10 of the trace events.
 666  *
 667  * Register/unregister probes at module load/unload.
 668  */
 669
 670 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 671
 672 #define TP_ID1(_token, _system) _token##_system
 673 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 674 #define module_init_eval1(_token, _system)      module_init(_token##_system)
 675 #define module_init_eval(_token, _system)       module_init_eval1(_token, _system)
 676 #define module_exit_eval1(_token, _system)      module_exit(_token##_system)
 677 #define module_exit_eval(_token, _system)       module_exit_eval1(_token, _system)
 678
 679 #ifndef TP_MODULE_OVERRIDE
 680 static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
 681 {
 682         wrapper_vmalloc_sync_all();
 683         return ltt_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
 684 }
 685
 686 module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
 687
 688 static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
 689 {
 690         ltt_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
 691 }
 692
 693 module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
 694 #endif
 695
 696 #undef module_init_eval
 697 #undef module_exit_eval
 698 #undef TP_ID1
 699 #undef TP_ID
 700
 701 #undef TP_PROTO
 702 #undef TP_ARGS
 703 #undef TRACE_EVENT_FLAGS