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 "lttng-probe-user.h"
  26 #include "../wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
  27 #include "../wrapper/ringbuffer/frontend_types.h"
  28 #include "../lttng-events.h"
  29 #include "../lttng-tracer-core.h"
  30
  31 /*
  32  * Macro declarations used for all stages.
  33  */
  34
  35 /*
  36  * LTTng name mapping macros. LTTng remaps some of the kernel events to
  37  * enforce name-spacing.
  38  */
  39 #undef TRACE_EVENT_MAP
  40 #define TRACE_EVENT_MAP(name, map, proto, args, tstruct, assign, print) \
  41         DECLARE_EVENT_CLASS(map,                                        \
  42                              PARAMS(proto),                             \
  43                              PARAMS(args),                              \
  44                              PARAMS(tstruct),                           \
  45                              PARAMS(assign),                            \
  46                              PARAMS(print))                             \
  47         DEFINE_EVENT_MAP(map, name, map, PARAMS(proto), PARAMS(args))
  48
  49 #undef TRACE_EVENT_MAP_NOARGS
  50 #define TRACE_EVENT_MAP_NOARGS(name, map, tstruct, assign, print)       \
  51         DECLARE_EVENT_CLASS_NOARGS(map,                                 \
  52                              PARAMS(tstruct),                           \
  53                              PARAMS(assign),                            \
  54                              PARAMS(print))                             \
  55         DEFINE_EVENT_MAP_NOARGS(map, name, map)
  56
  57 #undef DEFINE_EVENT_PRINT_MAP
  58 #define DEFINE_EVENT_PRINT_MAP(template, name, map, proto, args, print) \
  59         DEFINE_EVENT_MAP(template, name, map, PARAMS(proto), PARAMS(args))
  60
  61 /* Callbacks are meaningless to LTTng. */
  62 #undef TRACE_EVENT_FN_MAP
  63 #define TRACE_EVENT_FN_MAP(name, map, proto, args, tstruct,             \
  64                 assign, print, reg, unreg)                              \
  65         TRACE_EVENT_MAP(name, map, PARAMS(proto), PARAMS(args),         \
  66                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
  67
  68 #undef TRACE_EVENT_CONDITION_MAP
  69 #define TRACE_EVENT_CONDITION_MAP(name, map, proto, args, cond, tstruct, assign, print) \
  70         TRACE_EVENT_MAP(name, map,                                      \
  71                 PARAMS(proto),                                          \
  72                 PARAMS(args),                                           \
  73                 PARAMS(tstruct),                                        \
  74                 PARAMS(assign),                                         \
  75                 PARAMS(print))
  76
  77 /*
  78  * DECLARE_EVENT_CLASS can be used to add a generic function
  79  * handlers for events. That is, if all events have the same
  80  * parameters and just have distinct trace points.
  81  * Each tracepoint can be defined with DEFINE_EVENT and that
  82  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  83  *
  84  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  85  */
  86
  87 #undef TRACE_EVENT
  88 #define TRACE_EVENT(name, proto, args, tstruct, assign, print)  \
  89         TRACE_EVENT_MAP(name, name,                             \
  90                         PARAMS(proto),                          \
  91                         PARAMS(args),                           \
  92                         PARAMS(tstruct),                        \
  93                         PARAMS(assign),                         \
  94                         PARAMS(print))
  95
  96 #undef TRACE_EVENT_NOARGS
  97 #define TRACE_EVENT_NOARGS(name, tstruct, assign, print)        \
  98         TRACE_EVENT_MAP_NOARGS(name, name,                      \
  99                         PARAMS(tstruct),                        \
 100                         PARAMS(assign),                         \
 101                         PARAMS(print))
 102
 103 #undef DEFINE_EVENT_PRINT
 104 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 105         DEFINE_EVENT_PRINT_MAP(template, name, name,            \
 106                         PARAMS(proto), PARAMS(args), PARAMS(print_))
 107
 108 #undef TRACE_EVENT_FN
 109 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 110                 assign, print, reg, unreg)                              \
 111         TRACE_EVENT_FN_MAP(name, name, PARAMS(proto), PARAMS(args),     \
 112                 PARAMS(tstruct), PARAMS(assign), PARAMS(print),         \
 113                 PARAMS(reg), PARAMS(unreg))                             \
 114
 115 #undef DEFINE_EVENT
 116 #define DEFINE_EVENT(template, name, proto, args)                       \
 117         DEFINE_EVENT_MAP(template, name, name, PARAMS(proto), PARAMS(args))
 118
 119 #undef DEFINE_EVENT_NOARGS
 120 #define DEFINE_EVENT_NOARGS(template, name)                             \
 121         DEFINE_EVENT_MAP_NOARGS(template, name, name)
 122
 123 #undef TRACE_EVENT_CONDITION
 124 #define TRACE_EVENT_CONDITION(name, proto, args, cond, tstruct, assign, print) \
 125         TRACE_EVENT_CONDITION_MAP(name, name,                           \
 126                 PARAMS(proto),                                          \
 127                 PARAMS(args),                                           \
 128                 PARAMS(cond),                                           \
 129                 PARAMS(tstruct),                                        \
 130                 PARAMS(assign),                                         \
 131                 PARAMS(print))
 132
 133 /*
 134  * Stage 1 of the trace events.
 135  *
 136  * Create dummy trace calls for each events, verifying that the LTTng module
 137  * TRACE_EVENT headers match the kernel arguments. Will be optimized out by the
 138  * compiler.
 139  */
 140
 141 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 142
 143 #undef TP_PROTO
 144 #define TP_PROTO(args...) args
 145
 146 #undef TP_ARGS
 147 #define TP_ARGS(args...) args
 148
 149 #undef DEFINE_EVENT_MAP
 150 #define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args)         \
 151 void trace_##_name(_proto);
 152
 153 #undef DEFINE_EVENT_MAP_NOARGS
 154 #define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map)                 \
 155 void trace_##_name(void *__data);
 156
 157 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 158
 159 /*
 160  * Stage 2 of the trace events.
 161  *
 162  * Create event field type metadata section.
 163  * Each event produce an array of fields.
 164  */
 165
 166 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 167
 168 /* Named field types must be defined in lttng-types.h */
 169
 170 #undef __field_full
 171 #define __field_full(_type, _item, _order, _base)               \
 172         {                                                       \
 173           .name = #_item,                                       \
 174           .type = __type_integer(_type, _order, _base, none),   \
 175         },
 176
 177 #undef __field
 178 #define __field(_type, _item)                                   \
 179         __field_full(_type, _item, __BYTE_ORDER, 10)
 180
 181 #undef __field_ext
 182 #define __field_ext(_type, _item, _filter_type)                 \
 183         __field(_type, _item)
 184
 185 #undef __field_hex
 186 #define __field_hex(_type, _item)                               \
 187         __field_full(_type, _item, __BYTE_ORDER, 16)
 188
 189 #undef __field_network
 190 #define __field_network(_type, _item)                           \
 191         __field_full(_type, _item, __BIG_ENDIAN, 10)
 192
 193 #undef __field_network_hex
 194 #define __field_network_hex(_type, _item)                               \
 195         __field_full(_type, _item, __BIG_ENDIAN, 16)
 196
 197 #undef __array_enc_ext
 198 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 199         {                                                       \
 200           .name = #_item,                                       \
 201           .type =                                               \
 202                 {                                               \
 203                   .atype = atype_array,                         \
 204                   .u.array =                                    \
 205                         {                                       \
 206                             .length = _length,                  \
 207                             .elem_type = __type_integer(_type, _order, _base, _encoding), \
 208                         },                                      \
 209                 },                                              \
 210         },
 211
 212 #undef __array
 213 #define __array(_type, _item, _length)                          \
 214         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
 215
 216 #undef __array_text
 217 #define __array_text(_type, _item, _length)                     \
 218         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
 219
 220 #undef __array_hex
 221 #define __array_hex(_type, _item, _length)                      \
 222         __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
 223
 224 #undef __dynamic_array_enc_ext
 225 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
 226         {                                                       \
 227           .name = #_item,                                       \
 228           .type =                                               \
 229                 {                                               \
 230                   .atype = atype_sequence,                      \
 231                   .u.sequence =                                 \
 232                         {                                       \
 233                             .length_type = __type_integer(u32, __BYTE_ORDER, 10, none), \
 234                             .elem_type = __type_integer(_type, _order, _base, _encoding), \
 235                         },                                      \
 236                 },                                              \
 237         },
 238
 239 #undef __dynamic_array
 240 #define __dynamic_array(_type, _item, _length)                  \
 241         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
 242
 243 #undef __dynamic_array_text
 244 #define __dynamic_array_text(_type, _item, _length)             \
 245         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
 246
 247 #undef __dynamic_array_hex
 248 #define __dynamic_array_hex(_type, _item, _length)              \
 249         __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
 250
 251 #undef __string
 252 #define __string(_item, _src)                                   \
 253         {                                                       \
 254           .name = #_item,                                       \
 255           .type =                                               \
 256                 {                                               \
 257                   .atype = atype_string,                        \
 258                   .u.basic.string.encoding = lttng_encode_UTF8, \
 259                 },                                              \
 260         },
 261
 262 #undef __string_from_user
 263 #define __string_from_user(_item, _src)                         \
 264         __string(_item, _src)
 265
 266 #undef TP_STRUCT__entry
 267 #define TP_STRUCT__entry(args...) args  /* Only one used in this phase */
 268
 269 #undef DECLARE_EVENT_CLASS_NOARGS
 270 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
 271         static const struct lttng_event_field __event_fields___##_name[] = { \
 272                 _tstruct                                                     \
 273         };
 274
 275 #undef DECLARE_EVENT_CLASS
 276 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
 277         DECLARE_EVENT_CLASS_NOARGS(_name, PARAMS(_tstruct), PARAMS(_assign), \
 278                         PARAMS(_print))
 279
 280 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 281
 282 /*
 283  * Stage 3 of the trace events.
 284  *
 285  * Create probe callback prototypes.
 286  */
 287
 288 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 289
 290 #undef TP_PROTO
 291 #define TP_PROTO(args...) args
 292
 293 #undef DECLARE_EVENT_CLASS
 294 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 295 static void __event_probe__##_name(void *__data, _proto);
 296
 297 #undef DECLARE_EVENT_CLASS_NOARGS
 298 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print)          \
 299 static void __event_probe__##_name(void *__data);
 300
 301 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 302
 303 /*
 304  * Stage 3.9 of the trace events.
 305  *
 306  * Create event descriptions.
 307  */
 308
 309 /* Named field types must be defined in lttng-types.h */
 310
 311 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 312
 313 #ifndef TP_PROBE_CB
 314 #define TP_PROBE_CB(_template)  &__event_probe__##_template
 315 #endif
 316
 317 #undef DEFINE_EVENT_MAP_NOARGS
 318 #define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map)                 \
 319 static const struct lttng_event_desc __event_desc___##_map = {          \
 320         .fields = __event_fields___##_template,                         \
 321         .name = #_map,                                                  \
 322         .probe_callback = (void *) TP_PROBE_CB(_template),              \
 323         .nr_fields = ARRAY_SIZE(__event_fields___##_template),          \
 324         .owner = THIS_MODULE,                                           \
 325 };
 326
 327 #undef DEFINE_EVENT_MAP
 328 #define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args)         \
 329         DEFINE_EVENT_MAP_NOARGS(_template, _name, _map)
 330
 331 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 332
 333
 334 /*
 335  * Stage 4 of the trace events.
 336  *
 337  * Create an array of event description pointers.
 338  */
 339
 340 /* Named field types must be defined in lttng-types.h */
 341
 342 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 343
 344 #undef DEFINE_EVENT_MAP_NOARGS
 345 #define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map)                        \
 346                 &__event_desc___##_map,
 347
 348 #undef DEFINE_EVENT_MAP
 349 #define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args)                \
 350         DEFINE_EVENT_MAP_NOARGS(_template, _name, _map)
 351
 352 #define TP_ID1(_token, _system) _token##_system
 353 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 354
 355 static const struct lttng_event_desc *TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
 356 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 357 };
 358
 359 #undef TP_ID1
 360 #undef TP_ID
 361
 362
 363 /*
 364  * Stage 5 of the trace events.
 365  *
 366  * Create a toplevel descriptor for the whole probe.
 367  */
 368
 369 #define TP_ID1(_token, _system) _token##_system
 370 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 371
 372 /* non-const because list head will be modified when registered. */
 373 static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = {
 374         .event_desc = TP_ID(__event_desc___, TRACE_SYSTEM),
 375         .nr_events = ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)),
 376 };
 377
 378 #undef TP_ID1
 379 #undef TP_ID
 380
 381 /*
 382  * Stage 6 of the trace events.
 383  *
 384  * Create static inline function that calculates event size.
 385  */
 386
 387 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 388
 389 /* Named field types must be defined in lttng-types.h */
 390
 391 #undef __field_full
 392 #define __field_full(_type, _item, _order, _base)                              \
 393         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 394         __event_len += sizeof(_type);
 395
 396 #undef __array_enc_ext
 397 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)       \
 398         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 399         __event_len += sizeof(_type) * (_length);
 400
 401 #undef __dynamic_array_enc_ext
 402 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 403         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(u32));   \
 404         __event_len += sizeof(u32);                                            \
 405         __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
 406         __dynamic_len[__dynamic_len_idx] = (_length);                          \
 407         __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx];       \
 408         __dynamic_len_idx++;
 409
 410 #undef __string
 411 #define __string(_item, _src)                                                  \
 412         __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
 413
 414 /*
 415  * strlen_user includes \0. If returns 0, it faulted, so we set size to
 416  * 1 (\0 only).
 417  */
 418 #undef __string_from_user
 419 #define __string_from_user(_item, _src)                                        \
 420         __event_len += __dynamic_len[__dynamic_len_idx++] =                    \
 421                 max_t(size_t, lttng_strlen_user_inatomic(_src), 1);
 422
 423 #undef TP_PROTO
 424 #define TP_PROTO(args...) args
 425
 426 #undef TP_STRUCT__entry
 427 #define TP_STRUCT__entry(args...) args
 428
 429 #undef DECLARE_EVENT_CLASS
 430 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 431 static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \
 432 {                                                                             \
 433         size_t __event_len = 0;                                               \
 434         unsigned int __dynamic_len_idx = 0;                                   \
 435                                                                               \
 436         if (0)                                                                \
 437                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 438         _tstruct                                                              \
 439         return __event_len;                                                   \
 440 }
 441
 442 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 443
 444 /*
 445  * Stage 7 of the trace events.
 446  *
 447  * Create static inline function that calculates event payload alignment.
 448  */
 449
 450 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 451
 452 /* Named field types must be defined in lttng-types.h */
 453
 454 #undef __field_full
 455 #define __field_full(_type, _item, _order, _base)                         \
 456         __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
 457
 458 #undef __array_enc_ext
 459 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)  \
 460         __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
 461
 462 #undef __dynamic_array_enc_ext
 463 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 464         __event_align = max_t(size_t, __event_align, lttng_alignof(u32));         \
 465         __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
 466
 467 #undef __string
 468 #define __string(_item, _src)
 469
 470 #undef __string_from_user
 471 #define __string_from_user(_item, _src)
 472
 473 #undef TP_PROTO
 474 #define TP_PROTO(args...) args
 475
 476 #undef TP_STRUCT__entry
 477 #define TP_STRUCT__entry(args...) args
 478
 479 #undef DECLARE_EVENT_CLASS
 480 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 481 static inline size_t __event_get_align__##_name(_proto)                       \
 482 {                                                                             \
 483         size_t __event_align = 1;                                             \
 484         _tstruct                                                              \
 485         return __event_align;                                                 \
 486 }
 487
 488 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 489
 490
 491 /*
 492  * Stage 8 of the trace events.
 493  *
 494  * Create structure declaration that allows the "assign" macros to access the
 495  * field types.
 496  */
 497
 498 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 499
 500 /* Named field types must be defined in lttng-types.h */
 501
 502 #undef __field_full
 503 #define __field_full(_type, _item, _order, _base)       _type   _item;
 504
 505 #undef __array_enc_ext
 506 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)  \
 507         _type   _item;
 508
 509 #undef __dynamic_array_enc_ext
 510 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 511         _type   _item;
 512
 513 #undef __string
 514 #define __string(_item, _src)                   char _item;
 515
 516 #undef __string_from_user
 517 #define __string_from_user(_item, _src)         \
 518         __string(_item, _src)
 519
 520 #undef TP_STRUCT__entry
 521 #define TP_STRUCT__entry(args...) args
 522
 523 #undef DECLARE_EVENT_CLASS
 524 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 525 struct __event_typemap__##_name {                                             \
 526         _tstruct                                                              \
 527 };
 528
 529 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 530
 531
 532 /*
 533  * Stage 9 of the trace events.
 534  *
 535  * Create the probe function : call even size calculation and write event data
 536  * into the buffer.
 537  *
 538  * We use both the field and assignment macros to write the fields in the order
 539  * defined in the field declaration. The field declarations control the
 540  * execution order, jumping to the appropriate assignment block.
 541  */
 542
 543 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 544
 545 #undef __field_full
 546 #define __field_full(_type, _item, _order, _base)                       \
 547         goto __assign_##_item;                                          \
 548 __end_field_##_item:
 549
 550 #undef __array_enc_ext
 551 #define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 552         goto __assign_##_item;                                          \
 553 __end_field_##_item:
 554
 555 #undef __dynamic_array_enc_ext
 556 #define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
 557         goto __assign_##_item##_1;                                      \
 558 __end_field_##_item##_1:                                                \
 559         goto __assign_##_item##_2;                                      \
 560 __end_field_##_item##_2:
 561
 562 #undef __string
 563 #define __string(_item, _src)                                           \
 564         goto __assign_##_item;                                          \
 565 __end_field_##_item:
 566
 567 #undef __string_from_user
 568 #define __string_from_user(_item, _src)                                 \
 569         __string(_item, _src)
 570
 571 /*
 572  * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
 573  * strcpy().
 574  */
 575 #undef tp_assign
 576 #define tp_assign(dest, src)                                            \
 577 __assign_##dest:                                                        \
 578         {                                                               \
 579                 __typeof__(__typemap.dest) __tmp = (src);               \
 580                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp));        \
 581                 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
 582         }                                                               \
 583         goto __end_field_##dest;
 584
 585 /* fixed length array memcpy */
 586 #undef tp_memcpy_gen
 587 #define tp_memcpy_gen(write_ops, dest, src, len)                        \
 588 __assign_##dest:                                                        \
 589         if (0)                                                          \
 590                 (void) __typemap.dest;                                  \
 591         lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));       \
 592         __chan->ops->write_ops(&__ctx, src, len);                       \
 593         goto __end_field_##dest;
 594
 595 #undef tp_memcpy
 596 #define tp_memcpy(dest, src, len)                                       \
 597         tp_memcpy_gen(event_write, dest, src, len)
 598
 599 #undef tp_memcpy_from_user
 600 #define tp_memcpy_from_user(dest, src, len)                             \
 601         tp_memcpy_gen(event_write_from_user, dest, src, len)
 602
 603 /* variable length sequence memcpy */
 604 #undef tp_memcpy_dyn_gen
 605 #define tp_memcpy_dyn_gen(write_ops, dest, src)                         \
 606 __assign_##dest##_1:                                                    \
 607         {                                                               \
 608                 u32 __tmpl = __dynamic_len[__dynamic_len_idx];          \
 609                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(u32));  \
 610                 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \
 611         }                                                               \
 612         goto __end_field_##dest##_1;                                    \
 613 __assign_##dest##_2:                                                    \
 614         lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));       \
 615         __chan->ops->write_ops(&__ctx, src,                             \
 616                 sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\
 617         goto __end_field_##dest##_2;
 618
 619 #undef tp_memcpy_dyn
 620 #define tp_memcpy_dyn(dest, src)                                        \
 621         tp_memcpy_dyn_gen(event_write, dest, src)
 622
 623 #undef tp_memcpy_dyn_from_user
 624 #define tp_memcpy_dyn_from_user(dest, src)                              \
 625         tp_memcpy_dyn_gen(event_write_from_user, dest, src)
 626
 627 /*
 628  * The string length including the final \0.
 629  */
 630 #undef tp_copy_string_from_user
 631 #define tp_copy_string_from_user(dest, src)                             \
 632         __assign_##dest:                                                \
 633         {                                                               \
 634                 size_t __ustrlen;                                       \
 635                                                                         \
 636                 if (0)                                                  \
 637                         (void) __typemap.dest;                          \
 638                 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));\
 639                 __ustrlen = __get_dynamic_array_len(dest);              \
 640                 if (likely(__ustrlen > 1)) {                            \
 641                         __chan->ops->event_write_from_user(&__ctx, src, \
 642                                 __ustrlen - 1);                         \
 643                 }                                                       \
 644                 __chan->ops->event_memset(&__ctx, 0, 1);                \
 645         }                                                               \
 646         goto __end_field_##dest;
 647 #undef tp_strcpy
 648 #define tp_strcpy(dest, src)                                            \
 649         tp_memcpy(dest, src, __get_dynamic_array_len(dest))
 650
 651 /* Named field types must be defined in lttng-types.h */
 652
 653 #undef __get_str
 654 #define __get_str(field)                field
 655
 656 #undef __get_dynamic_array
 657 #define __get_dynamic_array(field)      field
 658
 659 /* Beware: this get len actually consumes the len value */
 660 #undef __get_dynamic_array_len
 661 #define __get_dynamic_array_len(field)  __dynamic_len[__dynamic_len_idx++]
 662
 663 #undef TP_PROTO
 664 #define TP_PROTO(args...) args
 665
 666 #undef TP_ARGS
 667 #define TP_ARGS(args...) args
 668
 669 #undef TP_STRUCT__entry
 670 #define TP_STRUCT__entry(args...) args
 671
 672 #undef TP_fast_assign
 673 #define TP_fast_assign(args...) args
 674
 675 /*
 676  * For state dump, check that "session" argument (mandatory) matches the
 677  * session this event belongs to. Ensures that we write state dump data only
 678  * into the started session, not into all sessions.
 679  */
 680 #ifdef TP_SESSION_CHECK
 681 #define _TP_SESSION_CHECK(session, csession)    (session == csession)
 682 #else /* TP_SESSION_CHECK */
 683 #define _TP_SESSION_CHECK(session, csession)    1
 684 #endif /* TP_SESSION_CHECK */
 685
 686 #undef DECLARE_EVENT_CLASS
 687 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print)  \
 688 static void __event_probe__##_name(void *__data, _proto)                      \
 689 {                                                                             \
 690         struct lttng_event *__event = __data;                                 \
 691         struct lttng_channel *__chan = __event->chan;                         \
 692         struct lib_ring_buffer_ctx __ctx;                                     \
 693         size_t __event_len, __event_align;                                    \
 694         size_t __dynamic_len_idx = 0;                                         \
 695         size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)];           \
 696         struct __event_typemap__##_name __typemap;                            \
 697         int __ret;                                                            \
 698                                                                               \
 699         if (0) {                                                              \
 700                 (void) __dynamic_len_idx;       /* don't warn if unused */    \
 701                 (void) __typemap;               /* don't warn if unused */    \
 702         }                                                                     \
 703         if (!_TP_SESSION_CHECK(session, __chan->session))                     \
 704                 return;                                                       \
 705         if (unlikely(!ACCESS_ONCE(__chan->session->active)))                  \
 706                 return;                                                       \
 707         if (unlikely(!ACCESS_ONCE(__chan->enabled)))                          \
 708                 return;                                                       \
 709         if (unlikely(!ACCESS_ONCE(__event->enabled)))                         \
 710                 return;                                                       \
 711         __event_len = __event_get_size__##_name(__dynamic_len, _args);        \
 712         __event_align = __event_get_align__##_name(_args);                    \
 713         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 714                                  __event_align, -1);                          \
 715         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 716         if (__ret < 0)                                                        \
 717                 return;                                                       \
 718         /* Control code (field ordering) */                                   \
 719         _tstruct                                                              \
 720         __chan->ops->event_commit(&__ctx);                                    \
 721         return;                                                               \
 722         /* Copy code, steered by control code */                              \
 723         _assign                                                               \
 724 }
 725
 726 #undef DECLARE_EVENT_CLASS_NOARGS
 727 #define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print)          \
 728 static void __event_probe__##_name(void *__data)                              \
 729 {                                                                             \
 730         struct lttng_event *__event = __data;                                 \
 731         struct lttng_channel *__chan = __event->chan;                         \
 732         struct lib_ring_buffer_ctx __ctx;                                     \
 733         size_t __event_len, __event_align;                                    \
 734         int __ret;                                                            \
 735                                                                               \
 736         if (!_TP_SESSION_CHECK(session, __chan->session))                     \
 737                 return;                                                       \
 738         if (unlikely(!ACCESS_ONCE(__chan->session->active)))                  \
 739                 return;                                                       \
 740         if (unlikely(!ACCESS_ONCE(__chan->enabled)))                          \
 741                 return;                                                       \
 742         if (unlikely(!ACCESS_ONCE(__event->enabled)))                         \
 743                 return;                                                       \
 744         __event_len = 0;                                                      \
 745         __event_align = 1;                                                    \
 746         lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len,  \
 747                                  __event_align, -1);                          \
 748         __ret = __chan->ops->event_reserve(&__ctx, __event->id);              \
 749         if (__ret < 0)                                                        \
 750                 return;                                                       \
 751         /* Control code (field ordering) */                                   \
 752         _tstruct                                                              \
 753         __chan->ops->event_commit(&__ctx);                                    \
 754         return;                                                               \
 755         /* Copy code, steered by control code */                              \
 756         _assign                                                               \
 757 }
 758
 759 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 760
 761 /*
 762  * Stage 10 of the trace events.
 763  *
 764  * Register/unregister probes at module load/unload.
 765  */
 766
 767 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
 768
 769 #define TP_ID1(_token, _system) _token##_system
 770 #define TP_ID(_token, _system)  TP_ID1(_token, _system)
 771 #define module_init_eval1(_token, _system)      module_init(_token##_system)
 772 #define module_init_eval(_token, _system)       module_init_eval1(_token, _system)
 773 #define module_exit_eval1(_token, _system)      module_exit(_token##_system)
 774 #define module_exit_eval(_token, _system)       module_exit_eval1(_token, _system)
 775
 776 #ifndef TP_MODULE_NOINIT
 777 static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
 778 {
 779         wrapper_vmalloc_sync_all();
 780         return lttng_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
 781 }
 782
 783 static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
 784 {
 785         lttng_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
 786 }
 787
 788 #ifndef TP_MODULE_NOAUTOLOAD
 789 module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
 790 module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
 791 #endif
 792
 793 #endif
 794
 795 #undef module_init_eval
 796 #undef module_exit_eval
 797 #undef TP_ID1
 798 #undef TP_ID
 799
 800 #undef TP_PROTO
 801 #undef TP_ARGS
 802 #undef TRACE_EVENT_FLAGS