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 TP_STRUCT__entry
 192 #define TP_STRUCT__entry(args...) args  /* Only one used in this phase */
 193
 194 #undef DECLARE_EVENT_CLASS_NOARGS
 195 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
 196         static const struct lttng_event_field __event_fields___##_name[] = { \
 197                 _tstruct                                                     \
 198         };
 199
 200 #undef DECLARE_EVENT_CLASS
 201 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
 202         DECLARE_EVENT_CLASS_NOARGS(_name, PARAMS(_tstruct), PARAMS(_assign), \
 203                         PARAMS(_print))
 204
 205 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 206
 207 /*
 208  * Stage 3 of the trace events.
 209  *
 210  * Create probe callback prototypes.
 211  */
 212
 213 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 214
 215 #undef TP_PROTO
 216 #define TP_PROTO(args...) args
 217
 218 #undef DECLARE_EVENT_CLASS
 219 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 220 static void __event_probe__##_name(void *__data, _proto);
 221
 222 #undef DECLARE_EVENT_CLASS_NOARGS
 223 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print)          \
 224 static void __event_probe__##_name(void *__data);
 225
 226 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 227
 228 /*
 229  * Stage 3.9 of the trace events.
 230  *
 231  * Create event descriptions.
 232  */
 233
 234 /* Named field types must be defined in lttng-types.h */
 235
 236 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 237
 238 #ifndef TP_PROBE_CB
 239 #define TP_PROBE_CB(_template)  &__event_probe__##_template
 240 #endif
 241
 242 #undef DEFINE_EVENT_NOARGS
 243 #define DEFINE_EVENT_NOARGS(_template, _name)                           \
 244 static const struct lttng_event_desc __event_desc___##_name = {         \
 245         .fields = __event_fields___##_template,                         \
 246         .name = #_name,                                                 \
 247         .probe_callback = (void *) TP_PROBE_CB(_template),              \
 248         .nr_fields = ARRAY_SIZE(__event_fields___##_template),          \
 249         .owner = THIS_MODULE,                                           \
 250 };
 251
 252 #undef DEFINE_EVENT
 253 #define DEFINE_EVENT(_template, _name, _proto, _args)                   \
 254         DEFINE_EVENT_NOARGS(_template, _name)
 255
 256 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 257
 258
 259 /*
 260  * Stage 4 of the trace events.
 261  *
 262  * Create an array of event description pointers.
 263  */
 264
 265 /* Named field types must be defined in lttng-types.h */
 266
 267 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 268
 269 #undef DEFINE_EVENT_NOARGS
 270 #define DEFINE_EVENT_NOARGS(_template, _name)                                  \
 271                 &__event_desc___##_name,
 272
 273 #undef DEFINE_EVENT
 274 #define DEFINE_EVENT(_template, _name, _proto, _args)                          \
 275         DEFINE_EVENT_NOARGS(_template, _name)
 276
 277 #define TP_ID1(_token, _system) _token##_system
 278 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 279
 280 static const struct lttng_event_desc *TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
 281 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 282 };
 283
 284 #undef TP_ID1
 285 #undef TP_ID
 286
 287
 288 /*
 289  * Stage 5 of the trace events.
 290  *
 291  * Create a toplevel descriptor for the whole probe.
 292  */
 293
 294 #define TP_ID1(_token, _system) _token##_system
 295 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 296
 297 /* non-const because list head will be modified when registered. */
 298 static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = {
 299         .event_desc = TP_ID(__event_desc___, TRACE_SYSTEM),
 300         .nr_events = ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)),
 301 };
 302
 303 #undef TP_ID1
 304 #undef TP_ID
 305
 306 /*
 307  * Stage 6 of the trace events.
 308  *
 309  * Create static inline function that calculates event size.
 310  */
 311
 312 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 313
 314 /* Named field types must be defined in lttng-types.h */
 315
 316 #undef __field_full
 317 #define __field_full(_type, _item, _order, _base)                              \
 318         __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
 319         __event_len += sizeof(_type);
 320
 321 #undef __array_enc_ext
 322 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)       \
 323         __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
 324         __event_len += sizeof(_type) * (_length);
 325
 326 #undef __dynamic_array_enc_ext
 327 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 328         __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(u32));   \
 329         __event_len += sizeof(u32);                                            \
 330         __event_len += lib_ring_buffer_align(__event_len, ltt_alignof(_type)); \
 331         __dynamic_len[__dynamic_len_idx] = (_length);                          \
 332         __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx];       \
 333         __dynamic_len_idx++;
 334
 335 #undef __string
 336 #define __string(_item, _src)                                                  \
 337         __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
 338
 339 #undef TP_PROTO
 340 #define TP_PROTO(args...) args
 341
 342 #undef TP_STRUCT__entry
 343 #define TP_STRUCT__entry(args...) args
 344
 345 #undef DECLARE_EVENT_CLASS
 346 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 347 static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \
 348 {                                                                             \
 349         size_t __event_len = 0;                                               \
 350         unsigned int __dynamic_len_idx = 0;                                   \
 351                                                                               \
 352         if (0)                                                                \
 353                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 354         _tstruct                                                              \
 355         return __event_len;                                                   \
 356 }
 357
 358 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 359
 360 /*
 361  * Stage 7 of the trace events.
 362  *
 363  * Create static inline function that calculates event payload alignment.
 364  */
 365
 366 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 367
 368 /* Named field types must be defined in lttng-types.h */
 369
 370 #undef __field_full
 371 #define __field_full(_type, _item, _order, _base)                         \
 372         __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
 373
 374 #undef __array_enc_ext
 375 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)  \
 376         __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
 377
 378 #undef __dynamic_array_enc_ext
 379 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 380         __event_align = max_t(size_t, __event_align, ltt_alignof(u32));   \
 381         __event_align = max_t(size_t, __event_align, ltt_alignof(_type));
 382
 383 #undef __string
 384 #define __string(_item, _src)
 385
 386 #undef TP_PROTO
 387 #define TP_PROTO(args...) args
 388
 389 #undef TP_STRUCT__entry
 390 #define TP_STRUCT__entry(args...) args
 391
 392 #undef DECLARE_EVENT_CLASS
 393 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 394 static inline size_t __event_get_align__##_name(_proto)                       \
 395 {                                                                             \
 396         size_t __event_align = 1;                                             \
 397         _tstruct                                                              \
 398         return __event_align;                                                 \
 399 }
 400
 401 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 402
 403
 404 /*
 405  * Stage 8 of the trace events.
 406  *
 407  * Create structure declaration that allows the "assign" macros to access the
 408  * field types.
 409  */
 410
 411 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 412
 413 /* Named field types must be defined in lttng-types.h */
 414
 415 #undef __field_full
 416 #define __field_full(_type, _item, _order, _base)       _type   _item;
 417
 418 #undef __array_enc_ext
 419 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)  \
 420         _type   _item;
 421
 422 #undef __dynamic_array_enc_ext
 423 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 424         _type   _item;
 425
 426 #undef __string
 427 #define __string(_item, _src)   char _item;
 428
 429 #undef TP_STRUCT__entry
 430 #define TP_STRUCT__entry(args...) args
 431
 432 #undef DECLARE_EVENT_CLASS
 433 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 434 struct __event_typemap__##_name {                                             \
 435         _tstruct                                                              \
 436 };
 437
 438 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 439
 440
 441 /*
 442  * Stage 9 of the trace events.
 443  *
 444  * Create the probe function : call even size calculation and write event data
 445  * into the buffer.
 446  *
 447  * We use both the field and assignment macros to write the fields in the order
 448  * defined in the field declaration. The field declarations control the
 449  * execution order, jumping to the appropriate assignment block.
 450  */
 451
 452 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 453
 454 #undef __field_full
 455 #define __field_full(_type, _item, _order, _base)                       \
 456         goto __assign_##_item;                                          \
 457 __end_field_##_item:
 458
 459 #undef __array_enc_ext
 460 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 461         goto __assign_##_item;                                          \
 462 __end_field_##_item:
 463
 464 #undef __dynamic_array_enc_ext
 465 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 466         goto __assign_##_item##_1;                                      \
 467 __end_field_##_item##_1:                                                \
 468         goto __assign_##_item##_2;                                      \
 469 __end_field_##_item##_2:
 470
 471 #undef __string
 472 #define __string(_item, _src)                                           \
 473         goto __assign_##_item;                                          \
 474 __end_field_##_item:
 475
 476 /*
 477  * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
 478  * strcpy().
 479  */
 480 #undef tp_assign
 481 #define tp_assign(dest, src)                                            \
 482 __assign_##dest:                                                        \
 483         {                                                               \
 484                 __typeof__(__typemap.dest) __tmp = (src);               \
 485                 lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__tmp));  \
 486                 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
 487         }                                                               \
 488         goto __end_field_##dest;
 489
 490 #undef tp_memcpy
 491 #define tp_memcpy(dest, src, len)                                       \
 492 __assign_##dest:                                                        \
 493         if (0)                                                          \
 494                 (void) __typemap.dest;                                  \
 495         lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
 496         __chan->ops->event_write(&__ctx, src, len);                     \
 497         goto __end_field_##dest;
 498
 499 #undef tp_memcpy_dyn
 500 #define tp_memcpy_dyn(dest, src)                                        \
 501 __assign_##dest##_1:                                                    \
 502         {                                                               \
 503                 u32 __tmpl = __dynamic_len[__dynamic_len_idx];          \
 504                 lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(u32));    \
 505                 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \
 506         }                                                               \
 507         goto __end_field_##dest##_1;                                    \
 508 __assign_##dest##_2:                                                    \
 509         lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
 510         __chan->ops->event_write(&__ctx, src,                           \
 511                 sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\
 512         goto __end_field_##dest##_2;
 513 #undef tp_memcpy_from_user
 514 #define tp_memcpy_from_user(dest, src, len)                             \
 515         __assign_##dest:                                                \
 516         if (0)                                                          \
 517                 (void) __typemap.dest;                                  \
 518         lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
 519         __chan->ops->event_write_from_user(&__ctx, src, len);           \
 520         goto __end_field_##dest;
 521 /*
 522  * tp_copy_string_from_user "len" parameter is the length of the string
 523  * excluding the final \0.
 524  */
 525 #undef tp_copy_string_from_user
 526 #define tp_copy_string_from_user(dest, src, len)                        \
 527         __assign_##dest:                                                \
 528         if (0)                                                          \
 529                 (void) __typemap.dest;                                  \
 530         lib_ring_buffer_align_ctx(&__ctx, ltt_alignof(__typemap.dest)); \
 531         __chan->ops->event_write_from_user(&__ctx, src, len);           \
 532         __chan->ops->event_memset(&__ctx, 0, 1);                        \
 533         goto __end_field_##dest;
 534
 535 #undef tp_strcpy
 536 #define tp_strcpy(dest, src)                                            \
 537         tp_memcpy(dest, src, __get_dynamic_array_len(dest))
 538
 539 /* Named field types must be defined in lttng-types.h */
 540
 541 #undef __get_str
 542 #define __get_str(field)                field
 543
 544 #undef __get_dynamic_array
 545 #define __get_dynamic_array(field)      field
 546
 547 /* Beware: this get len actually consumes the len value */
 548 #undef __get_dynamic_array_len
 549 #define __get_dynamic_array_len(field)  __dynamic_len[__dynamic_len_idx++]
 550
 551 #undef TP_PROTO
 552 #define TP_PROTO(args...) args
 553
 554 #undef TP_ARGS
 555 #define TP_ARGS(args...) args
 556
 557 #undef TP_STRUCT__entry
 558 #define TP_STRUCT__entry(args...) args
 559
 560 #undef TP_fast_assign
 561 #define TP_fast_assign(args...) args
 562
 563 #undef DECLARE_EVENT_CLASS
 564 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 565 static void __event_probe__##_name(void *__data, _proto)                      \
 566 {                                                                             \
 567         struct ltt_event *__event = __data;                                   \
 568         struct ltt_channel *__chan = __event->chan;                           \
 569         struct lib_ring_buffer_ctx __ctx;                                     \
 570         size_t __event_len, __event_align;                                    \
 571         size_t __dynamic_len_idx = 0;                                         \
 572         size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)];           \
 573         struct __event_typemap__##_name __typemap;                            \
 574         int __ret;                                                            \
 575                                                                               \
 576         if (0)                                                                \
 577                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 578         if (unlikely(!ACCESS_ONCE(__chan->session->active)))                  \
 579                 return;                                                       \
 580         if (unlikely(!ACCESS_ONCE(__chan->enabled)))                          \
 581                 return;                                                       \
 582         if (unlikely(!ACCESS_ONCE(__event->enabled)))                         \
 583                 return;                                                       \
 584         __event_len = __event_get_size__##_name(__dynamic_len, _args);        \
 585         __event_align = __event_get_align__##_name(_args);                    \
 586         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 587                                  __event_align, -1);                          \
 588         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 589         if (__ret < 0)                                                        \
 590                 return;                                                       \
 591         /* Control code (field ordering) */                                   \
 592         _tstruct                                                              \
 593         __chan->ops->event_commit(&__ctx);                                    \
 594         return;                                                               \
 595         /* Copy code, steered by control code */                              \
 596         _assign                                                               \
 597 }
 598
 599 #undef DECLARE_EVENT_CLASS_NOARGS
 600 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print)          \
 601 static void __event_probe__##_name(void *__data)                              \
 602 {                                                                             \
 603         struct ltt_event *__event = __data;                                   \
 604         struct ltt_channel *__chan = __event->chan;                           \
 605         struct lib_ring_buffer_ctx __ctx;                                     \
 606         size_t __event_len, __event_align;                                    \
 607         int __ret;                                                            \
 608                                                                               \
 609         if (unlikely(!ACCESS_ONCE(__chan->session->active)))                  \
 610                 return;                                                       \
 611         if (unlikely(!ACCESS_ONCE(__chan->enabled)))                          \
 612                 return;                                                       \
 613         if (unlikely(!ACCESS_ONCE(__event->enabled)))                         \
 614                 return;                                                       \
 615         __event_len = 0;                                                      \
 616         __event_align = 1;                                                    \
 617         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 618                                  __event_align, -1);                          \
 619         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 620         if (__ret < 0)                                                        \
 621                 return;                                                       \
 622         /* Control code (field ordering) */                                   \
 623         _tstruct                                                              \
 624         __chan->ops->event_commit(&__ctx);                                    \
 625         return;                                                               \
 626         /* Copy code, steered by control code */                              \
 627         _assign                                                               \
 628 }
 629
 630 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 631
 632 /*
 633  * Stage 10 of the trace events.
 634  *
 635  * Register/unregister probes at module load/unload.
 636  */
 637
 638 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 639
 640 #define TP_ID1(_token, _system) _token##_system
 641 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 642 #define module_init_eval1(_token, _system)      module_init(_token##_system)
 643 #define module_init_eval(_token, _system)       module_init_eval1(_token, _system)
 644 #define module_exit_eval1(_token, _system)      module_exit(_token##_system)
 645 #define module_exit_eval(_token, _system)       module_exit_eval1(_token, _system)
 646
 647 #ifndef TP_MODULE_OVERRIDE
 648 static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
 649 {
 650         wrapper_vmalloc_sync_all();
 651         return ltt_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
 652 }
 653
 654 module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
 655
 656 static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
 657 {
 658         ltt_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
 659 }
 660
 661 module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
 662 #endif
 663
 664 #undef module_init_eval
 665 #undef module_exit_eval
 666 #undef TP_ID1
 667 #undef TP_ID
 668
 669 #undef TP_PROTO
 670 #undef TP_ARGS
 671 #undef TRACE_EVENT_FLAGS