1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Stage 1 of the trace events. 4 * 5 * Override the macros in the event tracepoint header <trace/events/XXX.h> 6 * to include the following: 7 * 8 * struct trace_event_raw_<call> { 9 * struct trace_entry ent; 10 * <type> <item>; 11 * <type2> <item2>[<len>]; 12 * [...] 13 * }; 14 * 15 * The <type> <item> is created by the __field(type, item) macro or 16 * the __array(type2, item2, len) macro. 17 * We simply do "type item;", and that will create the fields 18 * in the structure. 19 */ 20 21 #include <linux/trace_events.h> 22 23 #ifndef TRACE_SYSTEM_VAR 24 #define TRACE_SYSTEM_VAR TRACE_SYSTEM 25 #endif 26 27 #define __app__(x, y) str__##x##y 28 #define __app(x, y) __app__(x, y) 29 30 #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name) 31 32 #define TRACE_MAKE_SYSTEM_STR() \ 33 static const char TRACE_SYSTEM_STRING[] = \ 34 __stringify(TRACE_SYSTEM) 35 36 TRACE_MAKE_SYSTEM_STR(); 37 38 #undef TRACE_DEFINE_ENUM 39 #define TRACE_DEFINE_ENUM(a) \ 40 static struct trace_eval_map __used __initdata \ 41 __##TRACE_SYSTEM##_##a = \ 42 { \ 43 .system = TRACE_SYSTEM_STRING, \ 44 .eval_string = #a, \ 45 .eval_value = a \ 46 }; \ 47 static struct trace_eval_map __used \ 48 __section("_ftrace_eval_map") \ 49 *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a 50 51 #undef TRACE_DEFINE_SIZEOF 52 #define TRACE_DEFINE_SIZEOF(a) \ 53 static struct trace_eval_map __used __initdata \ 54 __##TRACE_SYSTEM##_##a = \ 55 { \ 56 .system = TRACE_SYSTEM_STRING, \ 57 .eval_string = "sizeof(" #a ")", \ 58 .eval_value = sizeof(a) \ 59 }; \ 60 static struct trace_eval_map __used \ 61 __section("_ftrace_eval_map") \ 62 *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a 63 64 /* 65 * DECLARE_EVENT_CLASS can be used to add a generic function 66 * handlers for events. That is, if all events have the same 67 * parameters and just have distinct trace points. 68 * Each tracepoint can be defined with DEFINE_EVENT and that 69 * will map the DECLARE_EVENT_CLASS to the tracepoint. 70 * 71 * TRACE_EVENT is a one to one mapping between tracepoint and template. 72 */ 73 #undef TRACE_EVENT 74 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \ 75 DECLARE_EVENT_CLASS(name, \ 76 PARAMS(proto), \ 77 PARAMS(args), \ 78 PARAMS(tstruct), \ 79 PARAMS(assign), \ 80 PARAMS(print)); \ 81 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args)); 82 83 84 #undef __field 85 #define __field(type, item) type item; 86 87 #undef __field_ext 88 #define __field_ext(type, item, filter_type) type item; 89 90 #undef __field_struct 91 #define __field_struct(type, item) type item; 92 93 #undef __field_struct_ext 94 #define __field_struct_ext(type, item, filter_type) type item; 95 96 #undef __array 97 #define __array(type, item, len) type item[len]; 98 99 #undef __dynamic_array 100 #define __dynamic_array(type, item, len) u32 __data_loc_##item; 101 102 #undef __string 103 #define __string(item, src) __dynamic_array(char, item, -1) 104 105 #undef __string_len 106 #define __string_len(item, src, len) __dynamic_array(char, item, -1) 107 108 #undef __bitmask 109 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1) 110 111 #undef __rel_dynamic_array 112 #define __rel_dynamic_array(type, item, len) u32 __rel_loc_##item; 113 114 #undef __rel_string 115 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1) 116 117 #undef __rel_string_len 118 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1) 119 120 #undef __rel_bitmask 121 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(char, item, -1) 122 123 #undef TP_STRUCT__entry 124 #define TP_STRUCT__entry(args...) args 125 126 #undef DECLARE_EVENT_CLASS 127 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \ 128 struct trace_event_raw_##name { \ 129 struct trace_entry ent; \ 130 tstruct \ 131 char __data[0]; \ 132 }; \ 133 \ 134 static struct trace_event_class event_class_##name; 135 136 #undef DEFINE_EVENT 137 #define DEFINE_EVENT(template, name, proto, args) \ 138 static struct trace_event_call __used \ 139 __attribute__((__aligned__(4))) event_##name 140 141 #undef DEFINE_EVENT_FN 142 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \ 143 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 144 145 #undef DEFINE_EVENT_PRINT 146 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ 147 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args)) 148 149 /* Callbacks are meaningless to ftrace. */ 150 #undef TRACE_EVENT_FN 151 #define TRACE_EVENT_FN(name, proto, args, tstruct, \ 152 assign, print, reg, unreg) \ 153 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \ 154 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \ 155 156 #undef TRACE_EVENT_FN_COND 157 #define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct, \ 158 assign, print, reg, unreg) \ 159 TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond), \ 160 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \ 161 162 #undef TRACE_EVENT_FLAGS 163 #define TRACE_EVENT_FLAGS(name, value) \ 164 __TRACE_EVENT_FLAGS(name, value) 165 166 #undef TRACE_EVENT_PERF_PERM 167 #define TRACE_EVENT_PERF_PERM(name, expr...) \ 168 __TRACE_EVENT_PERF_PERM(name, expr) 169 170 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 171 172 /* 173 * Stage 2 of the trace events. 174 * 175 * Include the following: 176 * 177 * struct trace_event_data_offsets_<call> { 178 * u32 <item1>; 179 * u32 <item2>; 180 * [...] 181 * }; 182 * 183 * The __dynamic_array() macro will create each u32 <item>, this is 184 * to keep the offset of each array from the beginning of the event. 185 * The size of an array is also encoded, in the higher 16 bits of <item>. 186 */ 187 188 #undef TRACE_DEFINE_ENUM 189 #define TRACE_DEFINE_ENUM(a) 190 191 #undef TRACE_DEFINE_SIZEOF 192 #define TRACE_DEFINE_SIZEOF(a) 193 194 #undef __field 195 #define __field(type, item) 196 197 #undef __field_ext 198 #define __field_ext(type, item, filter_type) 199 200 #undef __field_struct 201 #define __field_struct(type, item) 202 203 #undef __field_struct_ext 204 #define __field_struct_ext(type, item, filter_type) 205 206 #undef __array 207 #define __array(type, item, len) 208 209 #undef __dynamic_array 210 #define __dynamic_array(type, item, len) u32 item; 211 212 #undef __string 213 #define __string(item, src) __dynamic_array(char, item, -1) 214 215 #undef __bitmask 216 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1) 217 218 #undef __string_len 219 #define __string_len(item, src, len) __dynamic_array(char, item, -1) 220 221 #undef __rel_dynamic_array 222 #define __rel_dynamic_array(type, item, len) u32 item; 223 224 #undef __rel_string 225 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1) 226 227 #undef __rel_string_len 228 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1) 229 230 #undef __rel_bitmask 231 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1) 232 233 #undef DECLARE_EVENT_CLASS 234 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 235 struct trace_event_data_offsets_##call { \ 236 tstruct; \ 237 }; 238 239 #undef DEFINE_EVENT 240 #define DEFINE_EVENT(template, name, proto, args) 241 242 #undef DEFINE_EVENT_PRINT 243 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) 244 245 #undef TRACE_EVENT_FLAGS 246 #define TRACE_EVENT_FLAGS(event, flag) 247 248 #undef TRACE_EVENT_PERF_PERM 249 #define TRACE_EVENT_PERF_PERM(event, expr...) 250 251 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 252 253 /* 254 * Stage 3 of the trace events. 255 * 256 * Override the macros in the event tracepoint header <trace/events/XXX.h> 257 * to include the following: 258 * 259 * enum print_line_t 260 * trace_raw_output_<call>(struct trace_iterator *iter, int flags) 261 * { 262 * struct trace_seq *s = &iter->seq; 263 * struct trace_event_raw_<call> *field; <-- defined in stage 1 264 * struct trace_seq *p = &iter->tmp_seq; 265 * 266 * -------(for event)------- 267 * 268 * struct trace_entry *entry; 269 * 270 * entry = iter->ent; 271 * 272 * if (entry->type != event_<call>->event.type) { 273 * WARN_ON_ONCE(1); 274 * return TRACE_TYPE_UNHANDLED; 275 * } 276 * 277 * field = (typeof(field))entry; 278 * 279 * trace_seq_init(p); 280 * return trace_output_call(iter, <call>, <TP_printk> "\n"); 281 * 282 * ------(or, for event class)------ 283 * 284 * int ret; 285 * 286 * field = (typeof(field))iter->ent; 287 * 288 * ret = trace_raw_output_prep(iter, trace_event); 289 * if (ret != TRACE_TYPE_HANDLED) 290 * return ret; 291 * 292 * trace_event_printf(iter, <TP_printk> "\n"); 293 * 294 * return trace_handle_return(s); 295 * ------- 296 * } 297 * 298 * This is the method used to print the raw event to the trace 299 * output format. Note, this is not needed if the data is read 300 * in binary. 301 */ 302 303 #undef __entry 304 #define __entry field 305 306 #undef TP_printk 307 #define TP_printk(fmt, args...) fmt "\n", args 308 309 #undef __get_dynamic_array 310 #define __get_dynamic_array(field) \ 311 ((void *)__entry + (__entry->__data_loc_##field & 0xffff)) 312 313 #undef __get_dynamic_array_len 314 #define __get_dynamic_array_len(field) \ 315 ((__entry->__data_loc_##field >> 16) & 0xffff) 316 317 #undef __get_str 318 #define __get_str(field) ((char *)__get_dynamic_array(field)) 319 320 #undef __get_rel_dynamic_array 321 #define __get_rel_dynamic_array(field) \ 322 ((void *)(&__entry->__rel_loc_##field) + \ 323 sizeof(__entry->__rel_loc_##field) + \ 324 (__entry->__rel_loc_##field & 0xffff)) 325 326 #undef __get_rel_dynamic_array_len 327 #define __get_rel_dynamic_array_len(field) \ 328 ((__entry->__rel_loc_##field >> 16) & 0xffff) 329 330 #undef __get_rel_str 331 #define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field)) 332 333 #undef __get_bitmask 334 #define __get_bitmask(field) \ 335 ({ \ 336 void *__bitmask = __get_dynamic_array(field); \ 337 unsigned int __bitmask_size; \ 338 __bitmask_size = __get_dynamic_array_len(field); \ 339 trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \ 340 }) 341 342 #undef __get_rel_bitmask 343 #define __get_rel_bitmask(field) \ 344 ({ \ 345 void *__bitmask = __get_rel_dynamic_array(field); \ 346 unsigned int __bitmask_size; \ 347 __bitmask_size = __get_rel_dynamic_array_len(field); \ 348 trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \ 349 }) 350 351 #undef __print_flags 352 #define __print_flags(flag, delim, flag_array...) \ 353 ({ \ 354 static const struct trace_print_flags __flags[] = \ 355 { flag_array, { -1, NULL }}; \ 356 trace_print_flags_seq(p, delim, flag, __flags); \ 357 }) 358 359 #undef __print_symbolic 360 #define __print_symbolic(value, symbol_array...) \ 361 ({ \ 362 static const struct trace_print_flags symbols[] = \ 363 { symbol_array, { -1, NULL }}; \ 364 trace_print_symbols_seq(p, value, symbols); \ 365 }) 366 367 #undef __print_flags_u64 368 #undef __print_symbolic_u64 369 #if BITS_PER_LONG == 32 370 #define __print_flags_u64(flag, delim, flag_array...) \ 371 ({ \ 372 static const struct trace_print_flags_u64 __flags[] = \ 373 { flag_array, { -1, NULL } }; \ 374 trace_print_flags_seq_u64(p, delim, flag, __flags); \ 375 }) 376 377 #define __print_symbolic_u64(value, symbol_array...) \ 378 ({ \ 379 static const struct trace_print_flags_u64 symbols[] = \ 380 { symbol_array, { -1, NULL } }; \ 381 trace_print_symbols_seq_u64(p, value, symbols); \ 382 }) 383 #else 384 #define __print_flags_u64(flag, delim, flag_array...) \ 385 __print_flags(flag, delim, flag_array) 386 387 #define __print_symbolic_u64(value, symbol_array...) \ 388 __print_symbolic(value, symbol_array) 389 #endif 390 391 #undef __print_hex 392 #define __print_hex(buf, buf_len) \ 393 trace_print_hex_seq(p, buf, buf_len, false) 394 395 #undef __print_hex_str 396 #define __print_hex_str(buf, buf_len) \ 397 trace_print_hex_seq(p, buf, buf_len, true) 398 399 #undef __print_array 400 #define __print_array(array, count, el_size) \ 401 ({ \ 402 BUILD_BUG_ON(el_size != 1 && el_size != 2 && \ 403 el_size != 4 && el_size != 8); \ 404 trace_print_array_seq(p, array, count, el_size); \ 405 }) 406 407 #undef __print_hex_dump 408 #define __print_hex_dump(prefix_str, prefix_type, \ 409 rowsize, groupsize, buf, len, ascii) \ 410 trace_print_hex_dump_seq(p, prefix_str, prefix_type, \ 411 rowsize, groupsize, buf, len, ascii) 412 413 #undef __print_ns_to_secs 414 #define __print_ns_to_secs(value) \ 415 ({ \ 416 u64 ____val = (u64)(value); \ 417 do_div(____val, NSEC_PER_SEC); \ 418 ____val; \ 419 }) 420 421 #undef __print_ns_without_secs 422 #define __print_ns_without_secs(value) \ 423 ({ \ 424 u64 ____val = (u64)(value); \ 425 (u32) do_div(____val, NSEC_PER_SEC); \ 426 }) 427 428 #undef DECLARE_EVENT_CLASS 429 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 430 static notrace enum print_line_t \ 431 trace_raw_output_##call(struct trace_iterator *iter, int flags, \ 432 struct trace_event *trace_event) \ 433 { \ 434 struct trace_seq *s = &iter->seq; \ 435 struct trace_seq __maybe_unused *p = &iter->tmp_seq; \ 436 struct trace_event_raw_##call *field; \ 437 int ret; \ 438 \ 439 field = (typeof(field))iter->ent; \ 440 \ 441 ret = trace_raw_output_prep(iter, trace_event); \ 442 if (ret != TRACE_TYPE_HANDLED) \ 443 return ret; \ 444 \ 445 trace_event_printf(iter, print); \ 446 \ 447 return trace_handle_return(s); \ 448 } \ 449 static struct trace_event_functions trace_event_type_funcs_##call = { \ 450 .trace = trace_raw_output_##call, \ 451 }; 452 453 #undef DEFINE_EVENT_PRINT 454 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \ 455 static notrace enum print_line_t \ 456 trace_raw_output_##call(struct trace_iterator *iter, int flags, \ 457 struct trace_event *event) \ 458 { \ 459 struct trace_event_raw_##template *field; \ 460 struct trace_entry *entry; \ 461 struct trace_seq *p = &iter->tmp_seq; \ 462 \ 463 entry = iter->ent; \ 464 \ 465 if (entry->type != event_##call.event.type) { \ 466 WARN_ON_ONCE(1); \ 467 return TRACE_TYPE_UNHANDLED; \ 468 } \ 469 \ 470 field = (typeof(field))entry; \ 471 \ 472 trace_seq_init(p); \ 473 return trace_output_call(iter, #call, print); \ 474 } \ 475 static struct trace_event_functions trace_event_type_funcs_##call = { \ 476 .trace = trace_raw_output_##call, \ 477 }; 478 479 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 480 481 #undef __field_ext 482 #define __field_ext(_type, _item, _filter_type) { \ 483 .type = #_type, .name = #_item, \ 484 .size = sizeof(_type), .align = __alignof__(_type), \ 485 .is_signed = is_signed_type(_type), .filter_type = _filter_type }, 486 487 #undef __field_struct_ext 488 #define __field_struct_ext(_type, _item, _filter_type) { \ 489 .type = #_type, .name = #_item, \ 490 .size = sizeof(_type), .align = __alignof__(_type), \ 491 0, .filter_type = _filter_type }, 492 493 #undef __field 494 #define __field(type, item) __field_ext(type, item, FILTER_OTHER) 495 496 #undef __field_struct 497 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER) 498 499 #undef __array 500 #define __array(_type, _item, _len) { \ 501 .type = #_type"["__stringify(_len)"]", .name = #_item, \ 502 .size = sizeof(_type[_len]), .align = __alignof__(_type), \ 503 .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER }, 504 505 #undef __dynamic_array 506 #define __dynamic_array(_type, _item, _len) { \ 507 .type = "__data_loc " #_type "[]", .name = #_item, \ 508 .size = 4, .align = 4, \ 509 .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER }, 510 511 #undef __string 512 #define __string(item, src) __dynamic_array(char, item, -1) 513 514 #undef __string_len 515 #define __string_len(item, src, len) __dynamic_array(char, item, -1) 516 517 #undef __bitmask 518 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1) 519 520 #undef __rel_dynamic_array 521 #define __rel_dynamic_array(_type, _item, _len) { \ 522 .type = "__rel_loc " #_type "[]", .name = #_item, \ 523 .size = 4, .align = 4, \ 524 .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER }, 525 526 #undef __rel_string 527 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1) 528 529 #undef __rel_string_len 530 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1) 531 532 #undef __rel_bitmask 533 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1) 534 535 #undef DECLARE_EVENT_CLASS 536 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \ 537 static struct trace_event_fields trace_event_fields_##call[] = { \ 538 tstruct \ 539 {} }; 540 541 #undef DEFINE_EVENT_PRINT 542 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) 543 544 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 545 546 /* 547 * remember the offset of each array from the beginning of the event. 548 */ 549 550 #undef __entry 551 #define __entry entry 552 553 #undef __field 554 #define __field(type, item) 555 556 #undef __field_ext 557 #define __field_ext(type, item, filter_type) 558 559 #undef __field_struct 560 #define __field_struct(type, item) 561 562 #undef __field_struct_ext 563 #define __field_struct_ext(type, item, filter_type) 564 565 #undef __array 566 #define __array(type, item, len) 567 568 #undef __dynamic_array 569 #define __dynamic_array(type, item, len) \ 570 __item_length = (len) * sizeof(type); \ 571 __data_offsets->item = __data_size + \ 572 offsetof(typeof(*entry), __data); \ 573 __data_offsets->item |= __item_length << 16; \ 574 __data_size += __item_length; 575 576 #undef __string 577 #define __string(item, src) __dynamic_array(char, item, \ 578 strlen((src) ? (const char *)(src) : "(null)") + 1) 579 580 #undef __string_len 581 #define __string_len(item, src, len) __dynamic_array(char, item, (len) + 1) 582 583 #undef __rel_dynamic_array 584 #define __rel_dynamic_array(type, item, len) \ 585 __item_length = (len) * sizeof(type); \ 586 __data_offsets->item = __data_size + \ 587 offsetof(typeof(*entry), __data) - \ 588 offsetof(typeof(*entry), __rel_loc_##item) - \ 589 sizeof(u32); \ 590 __data_offsets->item |= __item_length << 16; \ 591 __data_size += __item_length; 592 593 #undef __rel_string 594 #define __rel_string(item, src) __rel_dynamic_array(char, item, \ 595 strlen((src) ? (const char *)(src) : "(null)") + 1) 596 597 #undef __rel_string_len 598 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, (len) + 1) 599 /* 600 * __bitmask_size_in_bytes_raw is the number of bytes needed to hold 601 * num_possible_cpus(). 602 */ 603 #define __bitmask_size_in_bytes_raw(nr_bits) \ 604 (((nr_bits) + 7) / 8) 605 606 #define __bitmask_size_in_longs(nr_bits) \ 607 ((__bitmask_size_in_bytes_raw(nr_bits) + \ 608 ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8)) 609 610 /* 611 * __bitmask_size_in_bytes is the number of bytes needed to hold 612 * num_possible_cpus() padded out to the nearest long. This is what 613 * is saved in the buffer, just to be consistent. 614 */ 615 #define __bitmask_size_in_bytes(nr_bits) \ 616 (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8)) 617 618 #undef __bitmask 619 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, \ 620 __bitmask_size_in_longs(nr_bits)) 621 622 #undef __rel_bitmask 623 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, \ 624 __bitmask_size_in_longs(nr_bits)) 625 626 #undef DECLARE_EVENT_CLASS 627 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 628 static inline notrace int trace_event_get_offsets_##call( \ 629 struct trace_event_data_offsets_##call *__data_offsets, proto) \ 630 { \ 631 int __data_size = 0; \ 632 int __maybe_unused __item_length; \ 633 struct trace_event_raw_##call __maybe_unused *entry; \ 634 \ 635 tstruct; \ 636 \ 637 return __data_size; \ 638 } 639 640 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 641 642 /* 643 * Stage 4 of the trace events. 644 * 645 * Override the macros in the event tracepoint header <trace/events/XXX.h> 646 * to include the following: 647 * 648 * For those macros defined with TRACE_EVENT: 649 * 650 * static struct trace_event_call event_<call>; 651 * 652 * static void trace_event_raw_event_<call>(void *__data, proto) 653 * { 654 * struct trace_event_file *trace_file = __data; 655 * struct trace_event_call *event_call = trace_file->event_call; 656 * struct trace_event_data_offsets_<call> __maybe_unused __data_offsets; 657 * unsigned long eflags = trace_file->flags; 658 * enum event_trigger_type __tt = ETT_NONE; 659 * struct ring_buffer_event *event; 660 * struct trace_event_raw_<call> *entry; <-- defined in stage 1 661 * struct trace_buffer *buffer; 662 * unsigned long irq_flags; 663 * int __data_size; 664 * int pc; 665 * 666 * if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) { 667 * if (eflags & EVENT_FILE_FL_TRIGGER_MODE) 668 * event_triggers_call(trace_file, NULL); 669 * if (eflags & EVENT_FILE_FL_SOFT_DISABLED) 670 * return; 671 * } 672 * 673 * local_save_flags(irq_flags); 674 * pc = preempt_count(); 675 * 676 * __data_size = trace_event_get_offsets_<call>(&__data_offsets, args); 677 * 678 * event = trace_event_buffer_lock_reserve(&buffer, trace_file, 679 * event_<call>->event.type, 680 * sizeof(*entry) + __data_size, 681 * irq_flags, pc); 682 * if (!event) 683 * return; 684 * entry = ring_buffer_event_data(event); 685 * 686 * { <assign>; } <-- Here we assign the entries by the __field and 687 * __array macros. 688 * 689 * if (eflags & EVENT_FILE_FL_TRIGGER_COND) 690 * __tt = event_triggers_call(trace_file, entry); 691 * 692 * if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, 693 * &trace_file->flags)) 694 * ring_buffer_discard_commit(buffer, event); 695 * else if (!filter_check_discard(trace_file, entry, buffer, event)) 696 * trace_buffer_unlock_commit(buffer, event, irq_flags, pc); 697 * 698 * if (__tt) 699 * event_triggers_post_call(trace_file, __tt); 700 * } 701 * 702 * static struct trace_event ftrace_event_type_<call> = { 703 * .trace = trace_raw_output_<call>, <-- stage 2 704 * }; 705 * 706 * static char print_fmt_<call>[] = <TP_printk>; 707 * 708 * static struct trace_event_class __used event_class_<template> = { 709 * .system = "<system>", 710 * .fields_array = trace_event_fields_<call>, 711 * .fields = LIST_HEAD_INIT(event_class_##call.fields), 712 * .raw_init = trace_event_raw_init, 713 * .probe = trace_event_raw_event_##call, 714 * .reg = trace_event_reg, 715 * }; 716 * 717 * static struct trace_event_call event_<call> = { 718 * .class = event_class_<template>, 719 * { 720 * .tp = &__tracepoint_<call>, 721 * }, 722 * .event = &ftrace_event_type_<call>, 723 * .print_fmt = print_fmt_<call>, 724 * .flags = TRACE_EVENT_FL_TRACEPOINT, 725 * }; 726 * // its only safe to use pointers when doing linker tricks to 727 * // create an array. 728 * static struct trace_event_call __used 729 * __section("_ftrace_events") *__event_<call> = &event_<call>; 730 * 731 */ 732 733 #ifdef CONFIG_PERF_EVENTS 734 735 #define _TRACE_PERF_PROTO(call, proto) \ 736 static notrace void \ 737 perf_trace_##call(void *__data, proto); 738 739 #define _TRACE_PERF_INIT(call) \ 740 .perf_probe = perf_trace_##call, 741 742 #else 743 #define _TRACE_PERF_PROTO(call, proto) 744 #define _TRACE_PERF_INIT(call) 745 #endif /* CONFIG_PERF_EVENTS */ 746 747 #undef __entry 748 #define __entry entry 749 750 #undef __field 751 #define __field(type, item) 752 753 #undef __field_struct 754 #define __field_struct(type, item) 755 756 #undef __array 757 #define __array(type, item, len) 758 759 #undef __dynamic_array 760 #define __dynamic_array(type, item, len) \ 761 __entry->__data_loc_##item = __data_offsets.item; 762 763 #undef __string 764 #define __string(item, src) __dynamic_array(char, item, -1) 765 766 #undef __string_len 767 #define __string_len(item, src, len) __dynamic_array(char, item, -1) 768 769 #undef __assign_str 770 #define __assign_str(dst, src) \ 771 strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)"); 772 773 #undef __assign_str_len 774 #define __assign_str_len(dst, src, len) \ 775 do { \ 776 memcpy(__get_str(dst), (src), (len)); \ 777 __get_str(dst)[len] = '\0'; \ 778 } while(0) 779 780 #undef __bitmask 781 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1) 782 783 #undef __get_bitmask 784 #define __get_bitmask(field) (char *)__get_dynamic_array(field) 785 786 #undef __assign_bitmask 787 #define __assign_bitmask(dst, src, nr_bits) \ 788 memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits)) 789 790 #undef __rel_dynamic_array 791 #define __rel_dynamic_array(type, item, len) \ 792 __entry->__rel_loc_##item = __data_offsets.item; 793 794 #undef __rel_string 795 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1) 796 797 #undef __rel_string_len 798 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1) 799 800 #undef __assign_rel_str 801 #define __assign_rel_str(dst, src) \ 802 strcpy(__get_rel_str(dst), (src) ? (const char *)(src) : "(null)"); 803 804 #undef __assign_rel_str_len 805 #define __assign_rel_str_len(dst, src, len) \ 806 do { \ 807 memcpy(__get_rel_str(dst), (src), (len)); \ 808 __get_rel_str(dst)[len] = '\0'; \ 809 } while (0) 810 811 #undef __rel_bitmask 812 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1) 813 814 #undef __get_rel_bitmask 815 #define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field) 816 817 #undef __assign_rel_bitmask 818 #define __assign_rel_bitmask(dst, src, nr_bits) \ 819 memcpy(__get_rel_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits)) 820 821 #undef TP_fast_assign 822 #define TP_fast_assign(args...) args 823 824 #undef __perf_count 825 #define __perf_count(c) (c) 826 827 #undef __perf_task 828 #define __perf_task(t) (t) 829 830 #undef DECLARE_EVENT_CLASS 831 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 832 \ 833 static notrace void \ 834 trace_event_raw_event_##call(void *__data, proto) \ 835 { \ 836 struct trace_event_file *trace_file = __data; \ 837 struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\ 838 struct trace_event_buffer fbuffer; \ 839 struct trace_event_raw_##call *entry; \ 840 int __data_size; \ 841 \ 842 if (trace_trigger_soft_disabled(trace_file)) \ 843 return; \ 844 \ 845 __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \ 846 \ 847 entry = trace_event_buffer_reserve(&fbuffer, trace_file, \ 848 sizeof(*entry) + __data_size); \ 849 \ 850 if (!entry) \ 851 return; \ 852 \ 853 tstruct \ 854 \ 855 { assign; } \ 856 \ 857 trace_event_buffer_commit(&fbuffer); \ 858 } 859 /* 860 * The ftrace_test_probe is compiled out, it is only here as a build time check 861 * to make sure that if the tracepoint handling changes, the ftrace probe will 862 * fail to compile unless it too is updated. 863 */ 864 865 #undef DEFINE_EVENT 866 #define DEFINE_EVENT(template, call, proto, args) \ 867 static inline void ftrace_test_probe_##call(void) \ 868 { \ 869 check_trace_callback_type_##call(trace_event_raw_event_##template); \ 870 } 871 872 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 873 874 #undef __entry 875 #define __entry REC 876 877 #undef __print_flags 878 #undef __print_symbolic 879 #undef __print_hex 880 #undef __print_hex_str 881 #undef __get_dynamic_array 882 #undef __get_dynamic_array_len 883 #undef __get_str 884 #undef __get_bitmask 885 #undef __get_rel_dynamic_array 886 #undef __get_rel_dynamic_array_len 887 #undef __get_rel_str 888 #undef __get_rel_bitmask 889 #undef __print_array 890 #undef __print_hex_dump 891 892 /* 893 * The below is not executed in the kernel. It is only what is 894 * displayed in the print format for userspace to parse. 895 */ 896 #undef __print_ns_to_secs 897 #define __print_ns_to_secs(val) (val) / 1000000000UL 898 899 #undef __print_ns_without_secs 900 #define __print_ns_without_secs(val) (val) % 1000000000UL 901 902 #undef TP_printk 903 #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args) 904 905 #undef DECLARE_EVENT_CLASS 906 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 907 _TRACE_PERF_PROTO(call, PARAMS(proto)); \ 908 static char print_fmt_##call[] = print; \ 909 static struct trace_event_class __used __refdata event_class_##call = { \ 910 .system = TRACE_SYSTEM_STRING, \ 911 .fields_array = trace_event_fields_##call, \ 912 .fields = LIST_HEAD_INIT(event_class_##call.fields),\ 913 .raw_init = trace_event_raw_init, \ 914 .probe = trace_event_raw_event_##call, \ 915 .reg = trace_event_reg, \ 916 _TRACE_PERF_INIT(call) \ 917 }; 918 919 #undef DEFINE_EVENT 920 #define DEFINE_EVENT(template, call, proto, args) \ 921 \ 922 static struct trace_event_call __used event_##call = { \ 923 .class = &event_class_##template, \ 924 { \ 925 .tp = &__tracepoint_##call, \ 926 }, \ 927 .event.funcs = &trace_event_type_funcs_##template, \ 928 .print_fmt = print_fmt_##template, \ 929 .flags = TRACE_EVENT_FL_TRACEPOINT, \ 930 }; \ 931 static struct trace_event_call __used \ 932 __section("_ftrace_events") *__event_##call = &event_##call 933 934 #undef DEFINE_EVENT_PRINT 935 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \ 936 \ 937 static char print_fmt_##call[] = print; \ 938 \ 939 static struct trace_event_call __used event_##call = { \ 940 .class = &event_class_##template, \ 941 { \ 942 .tp = &__tracepoint_##call, \ 943 }, \ 944 .event.funcs = &trace_event_type_funcs_##call, \ 945 .print_fmt = print_fmt_##call, \ 946 .flags = TRACE_EVENT_FL_TRACEPOINT, \ 947 }; \ 948 static struct trace_event_call __used \ 949 __section("_ftrace_events") *__event_##call = &event_##call 950 951 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 952