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