probes/lttng-events.h

   1 /*
   2  * lttng-events.h
   3  *
   4  * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
   5  * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; only
  10  * version 2.1 of the License.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #include <linux/uaccess.h>
  22 #include <linux/debugfs.h>
  23 #include "lttng.h"
  24 #include "lttng-types.h"
  25 #include "../wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
  26 #include "../wrapper/ringbuffer/frontend_types.h"
  27 #include "../lttng-events.h"
  28 #include "../lttng-tracer-core.h"
  29
  30 /*
  31  * Macro declarations used for all stages.
  32  */
  33
  34 /*
  35  * DECLARE_EVENT_CLASS can be used to add a generic function
  36  * handlers for events. That is, if all events have the same
  37  * parameters and just have distinct trace points.
  38  * Each tracepoint can be defined with DEFINE_EVENT and that
  39  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  40  *
  41  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  42  */
  43
  44 #undef TRACE_EVENT
  45 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  46         DECLARE_EVENT_CLASS(name,                              \
  47                              PARAMS(proto),                    \
  48                              PARAMS(args),                     \
  49                              PARAMS(tstruct),                  \
  50                              PARAMS(assign),                   \
  51                              PARAMS(print))                    \
  52         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args))
  53
  54 #undef TRACE_EVENT_NOARGS
  55 #define TRACE_EVENT_NOARGS(name, tstruct, assign, print)       \
  56         DECLARE_EVENT_CLASS_NOARGS(name,                       \
  57                              PARAMS(tstruct),                  \
  58                              PARAMS(assign),                   \
  59                              PARAMS(print))                    \
  60         DEFINE_EVENT_NOARGS(name, name)
  61
  62
  63 #undef DEFINE_EVENT_PRINT
  64 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  65         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  66
  67 /* Callbacks are meaningless to LTTng. */
  68 #undef TRACE_EVENT_FN
  69 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  70                 assign, print, reg, unreg)                              \
  71         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
  72                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
  73
  74 /*
  75  * Stage 1 of the trace events.
  76  *
  77  * Create dummy trace calls for each events, verifying that the LTTng module
  78  * TRACE_EVENT headers match the kernel arguments. Will be optimized out by the
  79  * compiler.
  80  */
  81
  82 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
  83
  84 #undef TP_PROTO
  85 #define TP_PROTO(args...) args
  86
  87 #undef TP_ARGS
  88 #define TP_ARGS(args...) args
  89
  90 #undef DEFINE_EVENT
  91 #define DEFINE_EVENT(_template, _name, _proto, _args)                   \
  92 void trace_##_name(_proto);
  93
  94 #undef DEFINE_EVENT_NOARGS
  95 #define DEFINE_EVENT_NOARGS(_template, _name)                           \
  96 void trace_##_name(void *__data);
  97
  98 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  99
 100 /*
 101  * Stage 2 of the trace events.
 102  *
 103  * Create event field type metadata section.
 104  * Each event produce an array of fields.
 105  */
 106
 107 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 108
 109 /* Named field types must be defined in lttng-types.h */
 110
 111 #undef __field_full
 112 #define __field_full(_type, _item, _order, _base)               \
 113         {                                                       \
 114           .name = #_item,                                       \
 115           .type = __type_integer(_type, _order, _base, none),   \
 116         },
 117
 118 #undef __field
 119 #define __field(_type, _item)                                   \
 120         __field_full(_type, _item, __BYTE_ORDER, 10)
 121
 122 #undef __field_ext
 123 #define __field_ext(_type, _item, _filter_type)                 \
 124         __field(_type, _item)
 125
 126 #undef __field_hex
 127 #define __field_hex(_type, _item)                               \
 128         __field_full(_type, _item, __BYTE_ORDER, 16)
 129
 130 #undef __field_network
 131 #define __field_network(_type, _item)                           \
 132         __field_full(_type, _item, __BIG_ENDIAN, 10)
 133
 134 #undef __field_network_hex
 135 #define __field_network_hex(_type, _item)                               \
 136         __field_full(_type, _item, __BIG_ENDIAN, 16)
 137
 138 #undef __array_enc_ext
 139 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 140         {                                                       \
 141           .name = #_item,                                       \
 142           .type =                                               \
 143                 {                                               \
 144                   .atype = atype_array,                         \
 145                   .u.array =                                    \
 146                         {                                       \
 147                             .length = _length,                  \
 148                             .elem_type = __type_integer(_type, _order, _base, _encoding), \
 149                         },                                      \
 150                 },                                              \
 151         },
 152
 153 #undef __array
 154 #define __array(_type, _item, _length)                          \
 155         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
 156
 157 #undef __array_text
 158 #define __array_text(_type, _item, _length)                     \
 159         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
 160
 161 #undef __array_hex
 162 #define __array_hex(_type, _item, _length)                      \
 163         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
 164
 165 #undef __dynamic_array_enc_ext
 166 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
 167         {                                                       \
 168           .name = #_item,                                       \
 169           .type =                                               \
 170                 {                                               \
 171                   .atype = atype_sequence,                      \
 172                   .u.sequence =                                 \
 173                         {                                       \
 174                             .length_type = __type_integer(u32, __BYTE_ORDER, 10, none), \
 175                             .elem_type = __type_integer(_type, _order, _base, _encoding), \
 176                         },                                      \
 177                 },                                              \
 178         },
 179
 180 #undef __dynamic_array
 181 #define __dynamic_array(_type, _item, _length)                  \
 182         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
 183
 184 #undef __dynamic_array_text
 185 #define __dynamic_array_text(_type, _item, _length)             \
 186         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
 187
 188 #undef __dynamic_array_hex
 189 #define __dynamic_array_hex(_type, _item, _length)              \
 190         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
 191
 192 #undef __string
 193 #define __string(_item, _src)                                   \
 194         {                                                       \
 195           .name = #_item,                                       \
 196           .type =                                               \
 197                 {                                               \
 198                   .atype = atype_string,                        \
 199                   .u.basic.string.encoding = lttng_encode_UTF8, \
 200                 },                                              \
 201         },
 202
 203 #undef __string_from_user
 204 #define __string_from_user(_item, _src)                         \
 205         __string(_item, _src)
 206
 207 #undef TP_STRUCT__entry
 208 #define TP_STRUCT__entry(args...) args  /* Only one used in this phase */
 209
 210 #undef DECLARE_EVENT_CLASS_NOARGS
 211 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
 212         static const struct lttng_event_field __event_fields___##_name[] = { \
 213                 _tstruct                                                     \
 214         };
 215
 216 #undef DECLARE_EVENT_CLASS
 217 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
 218         DECLARE_EVENT_CLASS_NOARGS(_name, PARAMS(_tstruct), PARAMS(_assign), \
 219                         PARAMS(_print))
 220
 221 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 222
 223 /*
 224  * Stage 3 of the trace events.
 225  *
 226  * Create probe callback prototypes.
 227  */
 228
 229 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 230
 231 #undef TP_PROTO
 232 #define TP_PROTO(args...) args
 233
 234 #undef DECLARE_EVENT_CLASS
 235 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 236 static void __event_probe__##_name(void *__data, _proto);
 237
 238 #undef DECLARE_EVENT_CLASS_NOARGS
 239 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print)          \
 240 static void __event_probe__##_name(void *__data);
 241
 242 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 243
 244 /*
 245  * Stage 3.9 of the trace events.
 246  *
 247  * Create event descriptions.
 248  */
 249
 250 /* Named field types must be defined in lttng-types.h */
 251
 252 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 253
 254 #ifndef TP_PROBE_CB
 255 #define TP_PROBE_CB(_template)  &__event_probe__##_template
 256 #endif
 257
 258 #undef DEFINE_EVENT_NOARGS
 259 #define DEFINE_EVENT_NOARGS(_template, _name)                           \
 260 static const struct lttng_event_desc __event_desc___##_name = {         \
 261         .fields = __event_fields___##_template,                         \
 262         .name = #_name,                                                 \
 263         .probe_callback = (void *) TP_PROBE_CB(_template),              \
 264         .nr_fields = ARRAY_SIZE(__event_fields___##_template),          \
 265         .owner = THIS_MODULE,                                           \
 266 };
 267
 268 #undef DEFINE_EVENT
 269 #define DEFINE_EVENT(_template, _name, _proto, _args)                   \
 270         DEFINE_EVENT_NOARGS(_template, _name)
 271
 272 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 273
 274
 275 /*
 276  * Stage 4 of the trace events.
 277  *
 278  * Create an array of event description pointers.
 279  */
 280
 281 /* Named field types must be defined in lttng-types.h */
 282
 283 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 284
 285 #undef DEFINE_EVENT_NOARGS
 286 #define DEFINE_EVENT_NOARGS(_template, _name)                                  \
 287                 &__event_desc___##_name,
 288
 289 #undef DEFINE_EVENT
 290 #define DEFINE_EVENT(_template, _name, _proto, _args)                          \
 291         DEFINE_EVENT_NOARGS(_template, _name)
 292
 293 #define TP_ID1(_token, _system) _token##_system
 294 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 295
 296 static const struct lttng_event_desc *TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
 297 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 298 };
 299
 300 #undef TP_ID1
 301 #undef TP_ID
 302
 303
 304 /*
 305  * Stage 5 of the trace events.
 306  *
 307  * Create a toplevel descriptor for the whole probe.
 308  */
 309
 310 #define TP_ID1(_token, _system) _token##_system
 311 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 312
 313 /* non-const because list head will be modified when registered. */
 314 static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = {
 315         .event_desc = TP_ID(__event_desc___, TRACE_SYSTEM),
 316         .nr_events = ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)),
 317 };
 318
 319 #undef TP_ID1
 320 #undef TP_ID
 321
 322 /*
 323  * Stage 6 of the trace events.
 324  *
 325  * Create static inline function that calculates event size.
 326  */
 327
 328 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 329
 330 /* Named field types must be defined in lttng-types.h */
 331
 332 #undef __field_full
 333 #define __field_full(_type, _item, _order, _base)                              \
 334         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 335         __event_len += sizeof(_type);
 336
 337 #undef __array_enc_ext
 338 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)       \
 339         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 340         __event_len += sizeof(_type) * (_length);
 341
 342 #undef __dynamic_array_enc_ext
 343 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 344         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(u32));   \
 345         __event_len += sizeof(u32);                                            \
 346         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 347         __dynamic_len[__dynamic_len_idx] = (_length);                          \
 348         __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx];       \
 349         __dynamic_len_idx++;
 350
 351 #undef __string
 352 #define __string(_item, _src)                                                  \
 353         __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
 354
 355 /*
 356  * strlen_user includes \0. If returns 0, it faulted, so we set size to
 357  * 1 (\0 only).
 358  */
 359 #undef __string_from_user
 360 #define __string_from_user(_item, _src)                                        \
 361         __event_len += __dynamic_len[__dynamic_len_idx++] =                    \
 362                 max_t(size_t, strlen_user(_src), 1);
 363
 364 #undef TP_PROTO
 365 #define TP_PROTO(args...) args
 366
 367 #undef TP_STRUCT__entry
 368 #define TP_STRUCT__entry(args...) args
 369
 370 #undef DECLARE_EVENT_CLASS
 371 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 372 static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \
 373 {                                                                             \
 374         size_t __event_len = 0;                                               \
 375         unsigned int __dynamic_len_idx = 0;                                   \
 376                                                                               \
 377         if (0)                                                                \
 378                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 379         _tstruct                                                              \
 380         return __event_len;                                                   \
 381 }
 382
 383 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 384
 385 /*
 386  * Stage 7 of the trace events.
 387  *
 388  * Create static inline function that calculates event payload alignment.
 389  */
 390
 391 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 392
 393 /* Named field types must be defined in lttng-types.h */
 394
 395 #undef __field_full
 396 #define __field_full(_type, _item, _order, _base)                         \
 397         __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
 398
 399 #undef __array_enc_ext
 400 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)  \
 401         __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
 402
 403 #undef __dynamic_array_enc_ext
 404 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 405         __event_align = max_t(size_t, __event_align, lttng_alignof(u32));         \
 406         __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
 407
 408 #undef __string
 409 #define __string(_item, _src)
 410
 411 #undef __string_from_user
 412 #define __string_from_user(_item, _src)
 413
 414 #undef TP_PROTO
 415 #define TP_PROTO(args...) args
 416
 417 #undef TP_STRUCT__entry
 418 #define TP_STRUCT__entry(args...) args
 419
 420 #undef DECLARE_EVENT_CLASS
 421 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 422 static inline size_t __event_get_align__##_name(_proto)                       \
 423 {                                                                             \
 424         size_t __event_align = 1;                                             \
 425         _tstruct                                                              \
 426         return __event_align;                                                 \
 427 }
 428
 429 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 430
 431
 432 /*
 433  * Stage 8 of the trace events.
 434  *
 435  * Create structure declaration that allows the "assign" macros to access the
 436  * field types.
 437  */
 438
 439 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 440
 441 /* Named field types must be defined in lttng-types.h */
 442
 443 #undef __field_full
 444 #define __field_full(_type, _item, _order, _base)       _type   _item;
 445
 446 #undef __array_enc_ext
 447 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)  \
 448         _type   _item;
 449
 450 #undef __dynamic_array_enc_ext
 451 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 452         _type   _item;
 453
 454 #undef __string
 455 #define __string(_item, _src)                   char _item;
 456
 457 #undef __string_from_user
 458 #define __string_from_user(_item, _src)         \
 459         __string(_item, _src)
 460
 461 #undef TP_STRUCT__entry
 462 #define TP_STRUCT__entry(args...) args
 463
 464 #undef DECLARE_EVENT_CLASS
 465 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 466 struct __event_typemap__##_name {                                             \
 467         _tstruct                                                              \
 468 };
 469
 470 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 471
 472
 473 /*
 474  * Stage 9 of the trace events.
 475  *
 476  * Create the probe function : call even size calculation and write event data
 477  * into the buffer.
 478  *
 479  * We use both the field and assignment macros to write the fields in the order
 480  * defined in the field declaration. The field declarations control the
 481  * execution order, jumping to the appropriate assignment block.
 482  */
 483
 484 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 485
 486 #undef __field_full
 487 #define __field_full(_type, _item, _order, _base)                       \
 488         goto __assign_##_item;                                          \
 489 __end_field_##_item:
 490
 491 #undef __array_enc_ext
 492 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 493         goto __assign_##_item;                                          \
 494 __end_field_##_item:
 495
 496 #undef __dynamic_array_enc_ext
 497 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 498         goto __assign_##_item##_1;                                      \
 499 __end_field_##_item##_1:                                                \
 500         goto __assign_##_item##_2;                                      \
 501 __end_field_##_item##_2:
 502
 503 #undef __string
 504 #define __string(_item, _src)                                           \
 505         goto __assign_##_item;                                          \
 506 __end_field_##_item:
 507
 508 #undef __string_from_user
 509 #define __string_from_user(_item, _src)                                 \
 510         __string(_item, _src)
 511
 512 /*
 513  * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
 514  * strcpy().
 515  */
 516 #undef tp_assign
 517 #define tp_assign(dest, src)                                            \
 518 __assign_##dest:                                                        \
 519         {                                                               \
 520                 __typeof__(__typemap.dest) __tmp = (src);               \
 521                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));        \
 522                 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
 523         }                                                               \
 524         goto __end_field_##dest;
 525
 526 /* fixed length array memcpy */
 527 #undef tp_memcpy_gen
 528 #define tp_memcpy_gen(write_ops, dest, src, len)                        \
 529 __assign_##dest:                                                        \
 530         if (0)                                                          \
 531                 (void) __typemap.dest;                                  \
 532         lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));       \
 533         __chan->ops->write_ops(&__ctx, src, len);                       \
 534         goto __end_field_##dest;
 535
 536 #undef tp_memcpy
 537 #define tp_memcpy(dest, src, len)                                       \
 538         tp_memcpy_gen(event_write, dest, src, len)
 539
 540 #undef tp_memcpy_from_user
 541 #define tp_memcpy_from_user(dest, src, len)                             \
 542         tp_memcpy_gen(event_write_from_user, dest, src, len)
 543
 544 /* variable length sequence memcpy */
 545 #undef tp_memcpy_dyn_gen
 546 #define tp_memcpy_dyn_gen(write_ops, dest, src)                         \
 547 __assign_##dest##_1:                                                    \
 548         {                                                               \
 549                 u32 __tmpl = __dynamic_len[__dynamic_len_idx];          \
 550                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(u32));  \
 551                 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \
 552         }                                                               \
 553         goto __end_field_##dest##_1;                                    \
 554 __assign_##dest##_2:                                                    \
 555         lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));       \
 556         __chan->ops->write_ops(&__ctx, src,                             \
 557                 sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\
 558         goto __end_field_##dest##_2;
 559
 560 #undef tp_memcpy_dyn
 561 #define tp_memcpy_dyn(dest, src)                                        \
 562         tp_memcpy_dyn_gen(event_write, dest, src)
 563
 564 #undef tp_memcpy_dyn_from_user
 565 #define tp_memcpy_dyn_from_user(dest, src)                              \
 566         tp_memcpy_dyn_gen(event_write_from_user, dest, src)
 567
 568 /*
 569  * The string length including the final \0.
 570  */
 571 #undef tp_copy_string_from_user
 572 #define tp_copy_string_from_user(dest, src)                             \
 573         __assign_##dest:                                                \
 574         {                                                               \
 575                 size_t __ustrlen;                                       \
 576                                                                         \
 577                 if (0)                                                  \
 578                         (void) __typemap.dest;                          \
 579                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));\
 580                 __ustrlen = __get_dynamic_array_len(dest);              \
 581                 if (likely(__ustrlen > 1)) {                            \
 582                         __chan->ops->event_write_from_user(&__ctx, src, \
 583                                 __ustrlen - 1);                         \
 584                 }                                                       \
 585                 __chan->ops->event_memset(&__ctx, 0, 1);                \
 586         }                                                               \
 587         goto __end_field_##dest;
 588 #undef tp_strcpy
 589 #define tp_strcpy(dest, src)                                            \
 590         tp_memcpy(dest, src, __get_dynamic_array_len(dest))
 591
 592 /* Named field types must be defined in lttng-types.h */
 593
 594 #undef __get_str
 595 #define __get_str(field)                field
 596
 597 #undef __get_dynamic_array
 598 #define __get_dynamic_array(field)      field
 599
 600 /* Beware: this get len actually consumes the len value */
 601 #undef __get_dynamic_array_len
 602 #define __get_dynamic_array_len(field)  __dynamic_len[__dynamic_len_idx++]
 603
 604 #undef TP_PROTO
 605 #define TP_PROTO(args...) args
 606
 607 #undef TP_ARGS
 608 #define TP_ARGS(args...) args
 609
 610 #undef TP_STRUCT__entry
 611 #define TP_STRUCT__entry(args...) args
 612
 613 #undef TP_fast_assign
 614 #define TP_fast_assign(args...) args
 615
 616 /*
 617  * For state dump, check that "session" argument (mandatory) matches the
 618  * session this event belongs to. Ensures that we write state dump data only
 619  * into the started session, not into all sessions.
 620  */
 621 #ifdef TP_SESSION_CHECK
 622 #define _TP_SESSION_CHECK(session, csession)    (session == csession)
 623 #else /* TP_SESSION_CHECK */
 624 #define _TP_SESSION_CHECK(session, csession)    1
 625 #endif /* TP_SESSION_CHECK */
 626
 627 #undef DECLARE_EVENT_CLASS
 628 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 629 static void __event_probe__##_name(void *__data, _proto)                      \
 630 {                                                                             \
 631         struct lttng_event *__event = __data;                                 \
 632         struct lttng_channel *__chan = __event->chan;                         \
 633         struct lib_ring_buffer_ctx __ctx;                                     \
 634         size_t __event_len, __event_align;                                    \
 635         size_t __dynamic_len_idx = 0;                                         \
 636         size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)];           \
 637         struct __event_typemap__##_name __typemap;                            \
 638         int __ret;                                                            \
 639                                                                               \
 640         if (0) {                                                              \
 641                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 642                 (void) __typemap;               /* don't warn if unused */    \
 643         }                                                                     \
 644         if (!_TP_SESSION_CHECK(session, __chan->session))                     \
 645                 return;                                                       \
 646         if (unlikely(!ACCESS_ONCE(__chan->session->active)))                  \
 647                 return;                                                       \
 648         if (unlikely(!ACCESS_ONCE(__chan->enabled)))                          \
 649                 return;                                                       \
 650         if (unlikely(!ACCESS_ONCE(__event->enabled)))                         \
 651                 return;                                                       \
 652         __event_len = __event_get_size__##_name(__dynamic_len, _args);        \
 653         __event_align = __event_get_align__##_name(_args);                    \
 654         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 655                                  __event_align, -1);                          \
 656         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 657         if (__ret < 0)                                                        \
 658                 return;                                                       \
 659         /* Control code (field ordering) */                                   \
 660         _tstruct                                                              \
 661         __chan->ops->event_commit(&__ctx);                                    \
 662         return;                                                               \
 663         /* Copy code, steered by control code */                              \
 664         _assign                                                               \
 665 }
 666
 667 #undef DECLARE_EVENT_CLASS_NOARGS
 668 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print)          \
 669 static void __event_probe__##_name(void *__data)                              \
 670 {                                                                             \
 671         struct lttng_event *__event = __data;                                 \
 672         struct lttng_channel *__chan = __event->chan;                         \
 673         struct lib_ring_buffer_ctx __ctx;                                     \
 674         size_t __event_len, __event_align;                                    \
 675         int __ret;                                                            \
 676                                                                               \
 677         if (!_TP_SESSION_CHECK(session, __chan->session))                     \
 678                 return;                                                       \
 679         if (unlikely(!ACCESS_ONCE(__chan->session->active)))                  \
 680                 return;                                                       \
 681         if (unlikely(!ACCESS_ONCE(__chan->enabled)))                          \
 682                 return;                                                       \
 683         if (unlikely(!ACCESS_ONCE(__event->enabled)))                         \
 684                 return;                                                       \
 685         __event_len = 0;                                                      \
 686         __event_align = 1;                                                    \
 687         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 688                                  __event_align, -1);                          \
 689         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 690         if (__ret < 0)                                                        \
 691                 return;                                                       \
 692         /* Control code (field ordering) */                                   \
 693         _tstruct                                                              \
 694         __chan->ops->event_commit(&__ctx);                                    \
 695         return;                                                               \
 696         /* Copy code, steered by control code */                              \
 697         _assign                                                               \
 698 }
 699
 700 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 701
 702 /*
 703  * Stage 10 of the trace events.
 704  *
 705  * Register/unregister probes at module load/unload.
 706  */
 707
 708 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 709
 710 #define TP_ID1(_token, _system) _token##_system
 711 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 712 #define module_init_eval1(_token, _system)      module_init(_token##_system)
 713 #define module_init_eval(_token, _system)       module_init_eval1(_token, _system)
 714 #define module_exit_eval1(_token, _system)      module_exit(_token##_system)
 715 #define module_exit_eval(_token, _system)       module_exit_eval1(_token, _system)
 716
 717 #ifndef TP_MODULE_OVERRIDE
 718 static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
 719 {
 720         wrapper_vmalloc_sync_all();
 721         return lttng_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
 722 }
 723
 724 module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
 725
 726 static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
 727 {
 728         lttng_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
 729 }
 730
 731 module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
 732 #endif
 733
 734 #undef module_init_eval
 735 #undef module_exit_eval
 736 #undef TP_ID1
 737 #undef TP_ID
 738
 739 #undef TP_PROTO
 740 #undef TP_ARGS
 741 #undef TRACE_EVENT_FLAGS