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[]; \ 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 + \ 323 offsetof(typeof(*__entry), __rel_loc_##field) + \ 324 sizeof(__entry->__rel_loc_##field) + \ 325 (__entry->__rel_loc_##field & 0xffff)) 326 327 #undef __get_rel_dynamic_array_len 328 #define __get_rel_dynamic_array_len(field) \ 329 ((__entry->__rel_loc_##field >> 16) & 0xffff) 330 331 #undef __get_rel_str 332 #define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field)) 333 334 #undef __get_bitmask 335 #define __get_bitmask(field) \ 336 ({ \ 337 void *__bitmask = __get_dynamic_array(field); \ 338 unsigned int __bitmask_size; \ 339 __bitmask_size = __get_dynamic_array_len(field); \ 340 trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \ 341 }) 342 343 #undef __get_rel_bitmask 344 #define __get_rel_bitmask(field) \ 345 ({ \ 346 void *__bitmask = __get_rel_dynamic_array(field); \ 347 unsigned int __bitmask_size; \ 348 __bitmask_size = __get_rel_dynamic_array_len(field); \ 349 trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \ 350 }) 351 352 #undef __print_flags 353 #define __print_flags(flag, delim, flag_array...) \ 354 ({ \ 355 static const struct trace_print_flags __flags[] = \ 356 { flag_array, { -1, NULL }}; \ 357 trace_print_flags_seq(p, delim, flag, __flags); \ 358 }) 359 360 #undef __print_symbolic 361 #define __print_symbolic(value, symbol_array...) \ 362 ({ \ 363 static const struct trace_print_flags symbols[] = \ 364 { symbol_array, { -1, NULL }}; \ 365 trace_print_symbols_seq(p, value, symbols); \ 366 }) 367 368 #undef __print_flags_u64 369 #undef __print_symbolic_u64 370 #if BITS_PER_LONG == 32 371 #define __print_flags_u64(flag, delim, flag_array...) \ 372 ({ \ 373 static const struct trace_print_flags_u64 __flags[] = \ 374 { flag_array, { -1, NULL } }; \ 375 trace_print_flags_seq_u64(p, delim, flag, __flags); \ 376 }) 377 378 #define __print_symbolic_u64(value, symbol_array...) \ 379 ({ \ 380 static const struct trace_print_flags_u64 symbols[] = \ 381 { symbol_array, { -1, NULL } }; \ 382 trace_print_symbols_seq_u64(p, value, symbols); \ 383 }) 384 #else 385 #define __print_flags_u64(flag, delim, flag_array...) \ 386 __print_flags(flag, delim, flag_array) 387 388 #define __print_symbolic_u64(value, symbol_array...) \ 389 __print_symbolic(value, symbol_array) 390 #endif 391 392 #undef __print_hex 393 #define __print_hex(buf, buf_len) \ 394 trace_print_hex_seq(p, buf, buf_len, false) 395 396 #undef __print_hex_str 397 #define __print_hex_str(buf, buf_len) \ 398 trace_print_hex_seq(p, buf, buf_len, true) 399 400 #undef __print_array 401 #define __print_array(array, count, el_size) \ 402 ({ \ 403 BUILD_BUG_ON(el_size != 1 && el_size != 2 && \ 404 el_size != 4 && el_size != 8); \ 405 trace_print_array_seq(p, array, count, el_size); \ 406 }) 407 408 #undef __print_hex_dump 409 #define __print_hex_dump(prefix_str, prefix_type, \ 410 rowsize, groupsize, buf, len, ascii) \ 411 trace_print_hex_dump_seq(p, prefix_str, prefix_type, \ 412 rowsize, groupsize, buf, len, ascii) 413 414 #undef __print_ns_to_secs 415 #define __print_ns_to_secs(value) \ 416 ({ \ 417 u64 ____val = (u64)(value); \ 418 do_div(____val, NSEC_PER_SEC); \ 419 ____val; \ 420 }) 421 422 #undef __print_ns_without_secs 423 #define __print_ns_without_secs(value) \ 424 ({ \ 425 u64 ____val = (u64)(value); \ 426 (u32) do_div(____val, NSEC_PER_SEC); \ 427 }) 428 429 #undef DECLARE_EVENT_CLASS 430 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 431 static notrace enum print_line_t \ 432 trace_raw_output_##call(struct trace_iterator *iter, int flags, \ 433 struct trace_event *trace_event) \ 434 { \ 435 struct trace_seq *s = &iter->seq; \ 436 struct trace_seq __maybe_unused *p = &iter->tmp_seq; \ 437 struct trace_event_raw_##call *field; \ 438 int ret; \ 439 \ 440 field = (typeof(field))iter->ent; \ 441 \ 442 ret = trace_raw_output_prep(iter, trace_event); \ 443 if (ret != TRACE_TYPE_HANDLED) \ 444 return ret; \ 445 \ 446 trace_event_printf(iter, print); \ 447 \ 448 return trace_handle_return(s); \ 449 } \ 450 static struct trace_event_functions trace_event_type_funcs_##call = { \ 451 .trace = trace_raw_output_##call, \ 452 }; 453 454 #undef DEFINE_EVENT_PRINT 455 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \ 456 static notrace enum print_line_t \ 457 trace_raw_output_##call(struct trace_iterator *iter, int flags, \ 458 struct trace_event *event) \ 459 { \ 460 struct trace_event_raw_##template *field; \ 461 struct trace_entry *entry; \ 462 struct trace_seq *p = &iter->tmp_seq; \ 463 \ 464 entry = iter->ent; \ 465 \ 466 if (entry->type != event_##call.event.type) { \ 467 WARN_ON_ONCE(1); \ 468 return TRACE_TYPE_UNHANDLED; \ 469 } \ 470 \ 471 field = (typeof(field))entry; \ 472 \ 473 trace_seq_init(p); \ 474 return trace_output_call(iter, #call, print); \ 475 } \ 476 static struct trace_event_functions trace_event_type_funcs_##call = { \ 477 .trace = trace_raw_output_##call, \ 478 }; 479 480 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 481 482 #undef __field_ext 483 #define __field_ext(_type, _item, _filter_type) { \ 484 .type = #_type, .name = #_item, \ 485 .size = sizeof(_type), .align = __alignof__(_type), \ 486 .is_signed = is_signed_type(_type), .filter_type = _filter_type }, 487 488 #undef __field_struct_ext 489 #define __field_struct_ext(_type, _item, _filter_type) { \ 490 .type = #_type, .name = #_item, \ 491 .size = sizeof(_type), .align = __alignof__(_type), \ 492 0, .filter_type = _filter_type }, 493 494 #undef __field 495 #define __field(type, item) __field_ext(type, item, FILTER_OTHER) 496 497 #undef __field_struct 498 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER) 499 500 #undef __array 501 #define __array(_type, _item, _len) { \ 502 .type = #_type"["__stringify(_len)"]", .name = #_item, \ 503 .size = sizeof(_type[_len]), .align = __alignof__(_type), \ 504 .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER }, 505 506 #undef __dynamic_array 507 #define __dynamic_array(_type, _item, _len) { \ 508 .type = "__data_loc " #_type "[]", .name = #_item, \ 509 .size = 4, .align = 4, \ 510 .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER }, 511 512 #undef __string 513 #define __string(item, src) __dynamic_array(char, item, -1) 514 515 #undef __string_len 516 #define __string_len(item, src, len) __dynamic_array(char, item, -1) 517 518 #undef __bitmask 519 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1) 520 521 #undef __rel_dynamic_array 522 #define __rel_dynamic_array(_type, _item, _len) { \ 523 .type = "__rel_loc " #_type "[]", .name = #_item, \ 524 .size = 4, .align = 4, \ 525 .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER }, 526 527 #undef __rel_string 528 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1) 529 530 #undef __rel_string_len 531 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1) 532 533 #undef __rel_bitmask 534 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1) 535 536 #undef DECLARE_EVENT_CLASS 537 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \ 538 static struct trace_event_fields trace_event_fields_##call[] = { \ 539 tstruct \ 540 {} }; 541 542 #undef DEFINE_EVENT_PRINT 543 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) 544 545 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 546 547 /* 548 * remember the offset of each array from the beginning of the event. 549 */ 550 551 #undef __entry 552 #define __entry entry 553 554 #undef __field 555 #define __field(type, item) 556 557 #undef __field_ext 558 #define __field_ext(type, item, filter_type) 559 560 #undef __field_struct 561 #define __field_struct(type, item) 562 563 #undef __field_struct_ext 564 #define __field_struct_ext(type, item, filter_type) 565 566 #undef __array 567 #define __array(type, item, len) 568 569 #undef __dynamic_array 570 #define __dynamic_array(type, item, len) \ 571 __item_length = (len) * sizeof(type); \ 572 __data_offsets->item = __data_size + \ 573 offsetof(typeof(*entry), __data); \ 574 __data_offsets->item |= __item_length << 16; \ 575 __data_size += __item_length; 576 577 #undef __string 578 #define __string(item, src) __dynamic_array(char, item, \ 579 strlen((src) ? (const char *)(src) : "(null)") + 1) 580 581 #undef __string_len 582 #define __string_len(item, src, len) __dynamic_array(char, item, (len) + 1) 583 584 #undef __rel_dynamic_array 585 #define __rel_dynamic_array(type, item, len) \ 586 __item_length = (len) * sizeof(type); \ 587 __data_offsets->item = __data_size + \ 588 offsetof(typeof(*entry), __data) - \ 589 offsetof(typeof(*entry), __rel_loc_##item) - \ 590 sizeof(u32); \ 591 __data_offsets->item |= __item_length << 16; \ 592 __data_size += __item_length; 593 594 #undef __rel_string 595 #define __rel_string(item, src) __rel_dynamic_array(char, item, \ 596 strlen((src) ? (const char *)(src) : "(null)") + 1) 597 598 #undef __rel_string_len 599 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, (len) + 1) 600 /* 601 * __bitmask_size_in_bytes_raw is the number of bytes needed to hold 602 * num_possible_cpus(). 603 */ 604 #define __bitmask_size_in_bytes_raw(nr_bits) \ 605 (((nr_bits) + 7) / 8) 606 607 #define __bitmask_size_in_longs(nr_bits) \ 608 ((__bitmask_size_in_bytes_raw(nr_bits) + \ 609 ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8)) 610 611 /* 612 * __bitmask_size_in_bytes is the number of bytes needed to hold 613 * num_possible_cpus() padded out to the nearest long. This is what 614 * is saved in the buffer, just to be consistent. 615 */ 616 #define __bitmask_size_in_bytes(nr_bits) \ 617 (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8)) 618 619 #undef __bitmask 620 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, \ 621 __bitmask_size_in_longs(nr_bits)) 622 623 #undef __rel_bitmask 624 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, \ 625 __bitmask_size_in_longs(nr_bits)) 626 627 #undef DECLARE_EVENT_CLASS 628 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 629 static inline notrace int trace_event_get_offsets_##call( \ 630 struct trace_event_data_offsets_##call *__data_offsets, proto) \ 631 { \ 632 int __data_size = 0; \ 633 int __maybe_unused __item_length; \ 634 struct trace_event_raw_##call __maybe_unused *entry; \ 635 \ 636 tstruct; \ 637 \ 638 return __data_size; \ 639 } 640 641 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 642 643 /* 644 * Stage 4 of the trace events. 645 * 646 * Override the macros in the event tracepoint header <trace/events/XXX.h> 647 * to include the following: 648 * 649 * For those macros defined with TRACE_EVENT: 650 * 651 * static struct trace_event_call event_<call>; 652 * 653 * static void trace_event_raw_event_<call>(void *__data, proto) 654 * { 655 * struct trace_event_file *trace_file = __data; 656 * struct trace_event_call *event_call = trace_file->event_call; 657 * struct trace_event_data_offsets_<call> __maybe_unused __data_offsets; 658 * unsigned long eflags = trace_file->flags; 659 * enum event_trigger_type __tt = ETT_NONE; 660 * struct ring_buffer_event *event; 661 * struct trace_event_raw_<call> *entry; <-- defined in stage 1 662 * struct trace_buffer *buffer; 663 * unsigned long irq_flags; 664 * int __data_size; 665 * int pc; 666 * 667 * if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) { 668 * if (eflags & EVENT_FILE_FL_TRIGGER_MODE) 669 * event_triggers_call(trace_file, NULL); 670 * if (eflags & EVENT_FILE_FL_SOFT_DISABLED) 671 * return; 672 * } 673 * 674 * local_save_flags(irq_flags); 675 * pc = preempt_count(); 676 * 677 * __data_size = trace_event_get_offsets_<call>(&__data_offsets, args); 678 * 679 * event = trace_event_buffer_lock_reserve(&buffer, trace_file, 680 * event_<call>->event.type, 681 * sizeof(*entry) + __data_size, 682 * irq_flags, pc); 683 * if (!event) 684 * return; 685 * entry = ring_buffer_event_data(event); 686 * 687 * { <assign>; } <-- Here we assign the entries by the __field and 688 * __array macros. 689 * 690 * if (eflags & EVENT_FILE_FL_TRIGGER_COND) 691 * __tt = event_triggers_call(trace_file, entry); 692 * 693 * if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, 694 * &trace_file->flags)) 695 * ring_buffer_discard_commit(buffer, event); 696 * else if (!filter_check_discard(trace_file, entry, buffer, event)) 697 * trace_buffer_unlock_commit(buffer, event, irq_flags, pc); 698 * 699 * if (__tt) 700 * event_triggers_post_call(trace_file, __tt); 701 * } 702 * 703 * static struct trace_event ftrace_event_type_<call> = { 704 * .trace = trace_raw_output_<call>, <-- stage 2 705 * }; 706 * 707 * static char print_fmt_<call>[] = <TP_printk>; 708 * 709 * static struct trace_event_class __used event_class_<template> = { 710 * .system = "<system>", 711 * .fields_array = trace_event_fields_<call>, 712 * .fields = LIST_HEAD_INIT(event_class_##call.fields), 713 * .raw_init = trace_event_raw_init, 714 * .probe = trace_event_raw_event_##call, 715 * .reg = trace_event_reg, 716 * }; 717 * 718 * static struct trace_event_call event_<call> = { 719 * .class = event_class_<template>, 720 * { 721 * .tp = &__tracepoint_<call>, 722 * }, 723 * .event = &ftrace_event_type_<call>, 724 * .print_fmt = print_fmt_<call>, 725 * .flags = TRACE_EVENT_FL_TRACEPOINT, 726 * }; 727 * // its only safe to use pointers when doing linker tricks to 728 * // create an array. 729 * static struct trace_event_call __used 730 * __section("_ftrace_events") *__event_<call> = &event_<call>; 731 * 732 */ 733 734 #ifdef CONFIG_PERF_EVENTS 735 736 #define _TRACE_PERF_PROTO(call, proto) \ 737 static notrace void \ 738 perf_trace_##call(void *__data, proto); 739 740 #define _TRACE_PERF_INIT(call) \ 741 .perf_probe = perf_trace_##call, 742 743 #else 744 #define _TRACE_PERF_PROTO(call, proto) 745 #define _TRACE_PERF_INIT(call) 746 #endif /* CONFIG_PERF_EVENTS */ 747 748 #undef __entry 749 #define __entry entry 750 751 #undef __field 752 #define __field(type, item) 753 754 #undef __field_struct 755 #define __field_struct(type, item) 756 757 #undef __array 758 #define __array(type, item, len) 759 760 #undef __dynamic_array 761 #define __dynamic_array(type, item, len) \ 762 __entry->__data_loc_##item = __data_offsets.item; 763 764 #undef __string 765 #define __string(item, src) __dynamic_array(char, item, -1) 766 767 #undef __string_len 768 #define __string_len(item, src, len) __dynamic_array(char, item, -1) 769 770 #undef __assign_str 771 #define __assign_str(dst, src) \ 772 strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)"); 773 774 #undef __assign_str_len 775 #define __assign_str_len(dst, src, len) \ 776 do { \ 777 memcpy(__get_str(dst), (src), (len)); \ 778 __get_str(dst)[len] = '\0'; \ 779 } while(0) 780 781 #undef __bitmask 782 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1) 783 784 #undef __get_bitmask 785 #define __get_bitmask(field) (char *)__get_dynamic_array(field) 786 787 #undef __assign_bitmask 788 #define __assign_bitmask(dst, src, nr_bits) \ 789 memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits)) 790 791 #undef __rel_dynamic_array 792 #define __rel_dynamic_array(type, item, len) \ 793 __entry->__rel_loc_##item = __data_offsets.item; 794 795 #undef __rel_string 796 #define __rel_string(item, src) __rel_dynamic_array(char, item, -1) 797 798 #undef __rel_string_len 799 #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1) 800 801 #undef __assign_rel_str 802 #define __assign_rel_str(dst, src) \ 803 strcpy(__get_rel_str(dst), (src) ? (const char *)(src) : "(null)"); 804 805 #undef __assign_rel_str_len 806 #define __assign_rel_str_len(dst, src, len) \ 807 do { \ 808 memcpy(__get_rel_str(dst), (src), (len)); \ 809 __get_rel_str(dst)[len] = '\0'; \ 810 } while (0) 811 812 #undef __rel_bitmask 813 #define __rel_bitmask(item, nr_bits) __rel_dynamic_array(unsigned long, item, -1) 814 815 #undef __get_rel_bitmask 816 #define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field) 817 818 #undef __assign_rel_bitmask 819 #define __assign_rel_bitmask(dst, src, nr_bits) \ 820 memcpy(__get_rel_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits)) 821 822 #undef TP_fast_assign 823 #define TP_fast_assign(args...) args 824 825 #undef __perf_count 826 #define __perf_count(c) (c) 827 828 #undef __perf_task 829 #define __perf_task(t) (t) 830 831 #undef DECLARE_EVENT_CLASS 832 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 833 \ 834 static notrace void \ 835 trace_event_raw_event_##call(void *__data, proto) \ 836 { \ 837 struct trace_event_file *trace_file = __data; \ 838 struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\ 839 struct trace_event_buffer fbuffer; \ 840 struct trace_event_raw_##call *entry; \ 841 int __data_size; \ 842 \ 843 if (trace_trigger_soft_disabled(trace_file)) \ 844 return; \ 845 \ 846 __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \ 847 \ 848 entry = trace_event_buffer_reserve(&fbuffer, trace_file, \ 849 sizeof(*entry) + __data_size); \ 850 \ 851 if (!entry) \ 852 return; \ 853 \ 854 tstruct \ 855 \ 856 { assign; } \ 857 \ 858 trace_event_buffer_commit(&fbuffer); \ 859 } 860 /* 861 * The ftrace_test_probe is compiled out, it is only here as a build time check 862 * to make sure that if the tracepoint handling changes, the ftrace probe will 863 * fail to compile unless it too is updated. 864 */ 865 866 #undef DEFINE_EVENT 867 #define DEFINE_EVENT(template, call, proto, args) \ 868 static inline void ftrace_test_probe_##call(void) \ 869 { \ 870 check_trace_callback_type_##call(trace_event_raw_event_##template); \ 871 } 872 873 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 874 875 #undef __entry 876 #define __entry REC 877 878 #undef __print_flags 879 #undef __print_symbolic 880 #undef __print_hex 881 #undef __print_hex_str 882 #undef __get_dynamic_array 883 #undef __get_dynamic_array_len 884 #undef __get_str 885 #undef __get_bitmask 886 #undef __get_rel_dynamic_array 887 #undef __get_rel_dynamic_array_len 888 #undef __get_rel_str 889 #undef __get_rel_bitmask 890 #undef __print_array 891 #undef __print_hex_dump 892 893 /* 894 * The below is not executed in the kernel. It is only what is 895 * displayed in the print format for userspace to parse. 896 */ 897 #undef __print_ns_to_secs 898 #define __print_ns_to_secs(val) (val) / 1000000000UL 899 900 #undef __print_ns_without_secs 901 #define __print_ns_without_secs(val) (val) % 1000000000UL 902 903 #undef TP_printk 904 #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args) 905 906 #undef DECLARE_EVENT_CLASS 907 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \ 908 _TRACE_PERF_PROTO(call, PARAMS(proto)); \ 909 static char print_fmt_##call[] = print; \ 910 static struct trace_event_class __used __refdata event_class_##call = { \ 911 .system = TRACE_SYSTEM_STRING, \ 912 .fields_array = trace_event_fields_##call, \ 913 .fields = LIST_HEAD_INIT(event_class_##call.fields),\ 914 .raw_init = trace_event_raw_init, \ 915 .probe = trace_event_raw_event_##call, \ 916 .reg = trace_event_reg, \ 917 _TRACE_PERF_INIT(call) \ 918 }; 919 920 #undef DEFINE_EVENT 921 #define DEFINE_EVENT(template, call, proto, args) \ 922 \ 923 static struct trace_event_call __used event_##call = { \ 924 .class = &event_class_##template, \ 925 { \ 926 .tp = &__tracepoint_##call, \ 927 }, \ 928 .event.funcs = &trace_event_type_funcs_##template, \ 929 .print_fmt = print_fmt_##template, \ 930 .flags = TRACE_EVENT_FL_TRACEPOINT, \ 931 }; \ 932 static struct trace_event_call __used \ 933 __section("_ftrace_events") *__event_##call = &event_##call 934 935 #undef DEFINE_EVENT_PRINT 936 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \ 937 \ 938 static char print_fmt_##call[] = print; \ 939 \ 940 static struct trace_event_call __used event_##call = { \ 941 .class = &event_class_##template, \ 942 { \ 943 .tp = &__tracepoint_##call, \ 944 }, \ 945 .event.funcs = &trace_event_type_funcs_##call, \ 946 .print_fmt = print_fmt_##call, \ 947 .flags = TRACE_EVENT_FL_TRACEPOINT, \ 948 }; \ 949 static struct trace_event_call __used \ 950 __section("_ftrace_events") *__event_##call = &event_##call 951 952 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 953