include/trace/trace_events.h

   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 __bitmask
 106 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
 107
 108 #undef TP_STRUCT__entry
 109 #define TP_STRUCT__entry(args...) args
 110
 111 #undef DECLARE_EVENT_CLASS
 112 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
 113         struct trace_event_raw_##name {                                 \
 114                 struct trace_entry      ent;                            \
 115                 tstruct                                                 \
 116                 char                    __data[0];                      \
 117         };                                                              \
 118                                                                         \
 119         static struct trace_event_class event_class_##name;
 120
 121 #undef DEFINE_EVENT
 122 #define DEFINE_EVENT(template, name, proto, args)       \
 123         static struct trace_event_call  __used          \
 124         __attribute__((__aligned__(4))) event_##name
 125
 126 #undef DEFINE_EVENT_FN
 127 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
 128         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 129
 130 #undef DEFINE_EVENT_PRINT
 131 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 132         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 133
 134 /* Callbacks are meaningless to ftrace. */
 135 #undef TRACE_EVENT_FN
 136 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 137                 assign, print, reg, unreg)                              \
 138         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 139                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 140
 141 #undef TRACE_EVENT_FN_COND
 142 #define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct,   \
 143                 assign, print, reg, unreg)                              \
 144         TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond),          \
 145                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 146
 147 #undef TRACE_EVENT_FLAGS
 148 #define TRACE_EVENT_FLAGS(name, value)                                  \
 149         __TRACE_EVENT_FLAGS(name, value)
 150
 151 #undef TRACE_EVENT_PERF_PERM
 152 #define TRACE_EVENT_PERF_PERM(name, expr...)                            \
 153         __TRACE_EVENT_PERF_PERM(name, expr)
 154
 155 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 156
 157 /*
 158  * Stage 2 of the trace events.
 159  *
 160  * Include the following:
 161  *
 162  * struct trace_event_data_offsets_<call> {
 163  *      u32                             <item1>;
 164  *      u32                             <item2>;
 165  *      [...]
 166  * };
 167  *
 168  * The __dynamic_array() macro will create each u32 <item>, this is
 169  * to keep the offset of each array from the beginning of the event.
 170  * The size of an array is also encoded, in the higher 16 bits of <item>.
 171  */
 172
 173 #undef TRACE_DEFINE_ENUM
 174 #define TRACE_DEFINE_ENUM(a)
 175
 176 #undef TRACE_DEFINE_SIZEOF
 177 #define TRACE_DEFINE_SIZEOF(a)
 178
 179 #undef __field
 180 #define __field(type, item)
 181
 182 #undef __field_ext
 183 #define __field_ext(type, item, filter_type)
 184
 185 #undef __field_struct
 186 #define __field_struct(type, item)
 187
 188 #undef __field_struct_ext
 189 #define __field_struct_ext(type, item, filter_type)
 190
 191 #undef __array
 192 #define __array(type, item, len)
 193
 194 #undef __dynamic_array
 195 #define __dynamic_array(type, item, len)        u32 item;
 196
 197 #undef __string
 198 #define __string(item, src) __dynamic_array(char, item, -1)
 199
 200 #undef __bitmask
 201 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 202
 203 #undef DECLARE_EVENT_CLASS
 204 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 205         struct trace_event_data_offsets_##call {                        \
 206                 tstruct;                                                \
 207         };
 208
 209 #undef DEFINE_EVENT
 210 #define DEFINE_EVENT(template, name, proto, args)
 211
 212 #undef DEFINE_EVENT_PRINT
 213 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 214
 215 #undef TRACE_EVENT_FLAGS
 216 #define TRACE_EVENT_FLAGS(event, flag)
 217
 218 #undef TRACE_EVENT_PERF_PERM
 219 #define TRACE_EVENT_PERF_PERM(event, expr...)
 220
 221 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 222
 223 /*
 224  * Stage 3 of the trace events.
 225  *
 226  * Override the macros in the event tracepoint header <trace/events/XXX.h>
 227  * to include the following:
 228  *
 229  * enum print_line_t
 230  * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
 231  * {
 232  *      struct trace_seq *s = &iter->seq;
 233  *      struct trace_event_raw_<call> *field; <-- defined in stage 1
 234  *      struct trace_entry *entry;
 235  *      struct trace_seq *p = &iter->tmp_seq;
 236  *      int ret;
 237  *
 238  *      entry = iter->ent;
 239  *
 240  *      if (entry->type != event_<call>->event.type) {
 241  *              WARN_ON_ONCE(1);
 242  *              return TRACE_TYPE_UNHANDLED;
 243  *      }
 244  *
 245  *      field = (typeof(field))entry;
 246  *
 247  *      trace_seq_init(p);
 248  *      ret = trace_seq_printf(s, "%s: ", <call>);
 249  *      if (ret)
 250  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 251  *      if (!ret)
 252  *              return TRACE_TYPE_PARTIAL_LINE;
 253  *
 254  *      return TRACE_TYPE_HANDLED;
 255  * }
 256  *
 257  * This is the method used to print the raw event to the trace
 258  * output format. Note, this is not needed if the data is read
 259  * in binary.
 260  */
 261
 262 #undef __entry
 263 #define __entry field
 264
 265 #undef TP_printk
 266 #define TP_printk(fmt, args...) fmt "\n", args
 267
 268 #undef __get_dynamic_array
 269 #define __get_dynamic_array(field)      \
 270                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 271
 272 #undef __get_dynamic_array_len
 273 #define __get_dynamic_array_len(field)  \
 274                 ((__entry->__data_loc_##field >> 16) & 0xffff)
 275
 276 #undef __get_str
 277 #define __get_str(field) ((char *)__get_dynamic_array(field))
 278
 279 #undef __get_bitmask
 280 #define __get_bitmask(field)                                            \
 281         ({                                                              \
 282                 void *__bitmask = __get_dynamic_array(field);           \
 283                 unsigned int __bitmask_size;                            \
 284                 __bitmask_size = __get_dynamic_array_len(field);        \
 285                 trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 286         })
 287
 288 #undef __print_flags
 289 #define __print_flags(flag, delim, flag_array...)                       \
 290         ({                                                              \
 291                 static const struct trace_print_flags __flags[] =       \
 292                         { flag_array, { -1, NULL }};                    \
 293                 trace_print_flags_seq(p, delim, flag, __flags); \
 294         })
 295
 296 #undef __print_symbolic
 297 #define __print_symbolic(value, symbol_array...)                        \
 298         ({                                                              \
 299                 static const struct trace_print_flags symbols[] =       \
 300                         { symbol_array, { -1, NULL }};                  \
 301                 trace_print_symbols_seq(p, value, symbols);             \
 302         })
 303
 304 #undef __print_flags_u64
 305 #undef __print_symbolic_u64
 306 #if BITS_PER_LONG == 32
 307 #define __print_flags_u64(flag, delim, flag_array...)                   \
 308         ({                                                              \
 309                 static const struct trace_print_flags_u64 __flags[] =   \
 310                         { flag_array, { -1, NULL } };                   \
 311                 trace_print_flags_seq_u64(p, delim, flag, __flags);     \
 312         })
 313
 314 #define __print_symbolic_u64(value, symbol_array...)                    \
 315         ({                                                              \
 316                 static const struct trace_print_flags_u64 symbols[] =   \
 317                         { symbol_array, { -1, NULL } };                 \
 318                 trace_print_symbols_seq_u64(p, value, symbols); \
 319         })
 320 #else
 321 #define __print_flags_u64(flag, delim, flag_array...)                   \
 322                         __print_flags(flag, delim, flag_array)
 323
 324 #define __print_symbolic_u64(value, symbol_array...)                    \
 325                         __print_symbolic(value, symbol_array)
 326 #endif
 327
 328 #undef __print_hex
 329 #define __print_hex(buf, buf_len)                                       \
 330         trace_print_hex_seq(p, buf, buf_len, false)
 331
 332 #undef __print_hex_str
 333 #define __print_hex_str(buf, buf_len)                                   \
 334         trace_print_hex_seq(p, buf, buf_len, true)
 335
 336 #undef __print_array
 337 #define __print_array(array, count, el_size)                            \
 338         ({                                                              \
 339                 BUILD_BUG_ON(el_size != 1 && el_size != 2 &&            \
 340                              el_size != 4 && el_size != 8);             \
 341                 trace_print_array_seq(p, array, count, el_size);        \
 342         })
 343
 344 #undef __print_hex_dump
 345 #define __print_hex_dump(prefix_str, prefix_type,                       \
 346                          rowsize, groupsize, buf, len, ascii)           \
 347         trace_print_hex_dump_seq(p, prefix_str, prefix_type,            \
 348                                  rowsize, groupsize, buf, len, ascii)
 349
 350 #undef DECLARE_EVENT_CLASS
 351 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 352 static notrace enum print_line_t                                        \
 353 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 354                         struct trace_event *trace_event)                \
 355 {                                                                       \
 356         struct trace_seq *s = &iter->seq;                               \
 357         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 358         struct trace_event_raw_##call *field;                           \
 359         int ret;                                                        \
 360                                                                         \
 361         field = (typeof(field))iter->ent;                               \
 362                                                                         \
 363         ret = trace_raw_output_prep(iter, trace_event);                 \
 364         if (ret != TRACE_TYPE_HANDLED)                                  \
 365                 return ret;                                             \
 366                                                                         \
 367         trace_seq_printf(s, print);                                     \
 368                                                                         \
 369         return trace_handle_return(s);                                  \
 370 }                                                                       \
 371 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 372         .trace                  = trace_raw_output_##call,              \
 373 };
 374
 375 #undef DEFINE_EVENT_PRINT
 376 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 377 static notrace enum print_line_t                                        \
 378 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 379                          struct trace_event *event)                     \
 380 {                                                                       \
 381         struct trace_event_raw_##template *field;                       \
 382         struct trace_entry *entry;                                      \
 383         struct trace_seq *p = &iter->tmp_seq;                           \
 384                                                                         \
 385         entry = iter->ent;                                              \
 386                                                                         \
 387         if (entry->type != event_##call.event.type) {                   \
 388                 WARN_ON_ONCE(1);                                        \
 389                 return TRACE_TYPE_UNHANDLED;                            \
 390         }                                                               \
 391                                                                         \
 392         field = (typeof(field))entry;                                   \
 393                                                                         \
 394         trace_seq_init(p);                                              \
 395         return trace_output_call(iter, #call, print);                   \
 396 }                                                                       \
 397 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 398         .trace                  = trace_raw_output_##call,              \
 399 };
 400
 401 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 402
 403 #undef __field_ext
 404 #define __field_ext(_type, _item, _filter_type) {                       \
 405         .type = #_type, .name = #_item,                                 \
 406         .size = sizeof(_type), .align = __alignof__(_type),             \
 407         .is_signed = is_signed_type(_type), .filter_type = _filter_type },
 408
 409 #undef __field_struct_ext
 410 #define __field_struct_ext(_type, _item, _filter_type) {                \
 411         .type = #_type, .name = #_item,                                 \
 412         .size = sizeof(_type), .align = __alignof__(_type),             \
 413         0, .filter_type = _filter_type },
 414
 415 #undef __field
 416 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 417
 418 #undef __field_struct
 419 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 420
 421 #undef __array
 422 #define __array(_type, _item, _len) {                                   \
 423         .type = #_type"["__stringify(_len)"]", .name = #_item,          \
 424         .size = sizeof(_type[_len]), .align = __alignof__(_type),       \
 425         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 426
 427 #undef __dynamic_array
 428 #define __dynamic_array(_type, _item, _len) {                           \
 429         .type = "__data_loc " #_type "[]", .name = #_item,              \
 430         .size = 4, .align = 4,                                          \
 431         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 432
 433 #undef __string
 434 #define __string(item, src) __dynamic_array(char, item, -1)
 435
 436 #undef __bitmask
 437 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 438
 439 #undef DECLARE_EVENT_CLASS
 440 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 441 static struct trace_event_fields trace_event_fields_##call[] = {        \
 442         tstruct                                                         \
 443         {} };
 444
 445 #undef DEFINE_EVENT_PRINT
 446 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 447
 448 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 449
 450 /*
 451  * remember the offset of each array from the beginning of the event.
 452  */
 453
 454 #undef __entry
 455 #define __entry entry
 456
 457 #undef __field
 458 #define __field(type, item)
 459
 460 #undef __field_ext
 461 #define __field_ext(type, item, filter_type)
 462
 463 #undef __field_struct
 464 #define __field_struct(type, item)
 465
 466 #undef __field_struct_ext
 467 #define __field_struct_ext(type, item, filter_type)
 468
 469 #undef __array
 470 #define __array(type, item, len)
 471
 472 #undef __dynamic_array
 473 #define __dynamic_array(type, item, len)                                \
 474         __item_length = (len) * sizeof(type);                           \
 475         __data_offsets->item = __data_size +                            \
 476                                offsetof(typeof(*entry), __data);        \
 477         __data_offsets->item |= __item_length << 16;                    \
 478         __data_size += __item_length;
 479
 480 #undef __string
 481 #define __string(item, src) __dynamic_array(char, item,                 \
 482                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 483
 484 /*
 485  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 486  * num_possible_cpus().
 487  */
 488 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 489         (((nr_bits) + 7) / 8)
 490
 491 #define __bitmask_size_in_longs(nr_bits)                        \
 492         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 493           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 494
 495 /*
 496  * __bitmask_size_in_bytes is the number of bytes needed to hold
 497  * num_possible_cpus() padded out to the nearest long. This is what
 498  * is saved in the buffer, just to be consistent.
 499  */
 500 #define __bitmask_size_in_bytes(nr_bits)                                \
 501         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 502
 503 #undef __bitmask
 504 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 505                                          __bitmask_size_in_longs(nr_bits))
 506
 507 #undef DECLARE_EVENT_CLASS
 508 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 509 static inline notrace int trace_event_get_offsets_##call(               \
 510         struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 511 {                                                                       \
 512         int __data_size = 0;                                            \
 513         int __maybe_unused __item_length;                               \
 514         struct trace_event_raw_##call __maybe_unused *entry;            \
 515                                                                         \
 516         tstruct;                                                        \
 517                                                                         \
 518         return __data_size;                                             \
 519 }
 520
 521 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 522
 523 /*
 524  * Stage 4 of the trace events.
 525  *
 526  * Override the macros in the event tracepoint header <trace/events/XXX.h>
 527  * to include the following:
 528  *
 529  * For those macros defined with TRACE_EVENT:
 530  *
 531  * static struct trace_event_call event_<call>;
 532  *
 533  * static void trace_event_raw_event_<call>(void *__data, proto)
 534  * {
 535  *      struct trace_event_file *trace_file = __data;
 536  *      struct trace_event_call *event_call = trace_file->event_call;
 537  *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 538  *      unsigned long eflags = trace_file->flags;
 539  *      enum event_trigger_type __tt = ETT_NONE;
 540  *      struct ring_buffer_event *event;
 541  *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 542  *      struct trace_buffer *buffer;
 543  *      unsigned long irq_flags;
 544  *      int __data_size;
 545  *      int pc;
 546  *
 547  *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 548  *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 549  *                      event_triggers_call(trace_file, NULL);
 550  *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 551  *                      return;
 552  *      }
 553  *
 554  *      local_save_flags(irq_flags);
 555  *      pc = preempt_count();
 556  *
 557  *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 558  *
 559  *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 560  *                                event_<call>->event.type,
 561  *                                sizeof(*entry) + __data_size,
 562  *                                irq_flags, pc);
 563  *      if (!event)
 564  *              return;
 565  *      entry   = ring_buffer_event_data(event);
 566  *
 567  *      { <assign>; }  <-- Here we assign the entries by the __field and
 568  *                         __array macros.
 569  *
 570  *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 571  *              __tt = event_triggers_call(trace_file, entry);
 572  *
 573  *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 574  *                   &trace_file->flags))
 575  *              ring_buffer_discard_commit(buffer, event);
 576  *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 577  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 578  *
 579  *      if (__tt)
 580  *              event_triggers_post_call(trace_file, __tt);
 581  * }
 582  *
 583  * static struct trace_event ftrace_event_type_<call> = {
 584  *      .trace                  = trace_raw_output_<call>, <-- stage 2
 585  * };
 586  *
 587  * static char print_fmt_<call>[] = <TP_printk>;
 588  *
 589  * static struct trace_event_class __used event_class_<template> = {
 590  *      .system                 = "<system>",
 591  *      .fields_array           = trace_event_fields_<call>,
 592  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 593  *      .raw_init               = trace_event_raw_init,
 594  *      .probe                  = trace_event_raw_event_##call,
 595  *      .reg                    = trace_event_reg,
 596  * };
 597  *
 598  * static struct trace_event_call event_<call> = {
 599  *      .class                  = event_class_<template>,
 600  *      {
 601  *              .tp                     = &__tracepoint_<call>,
 602  *      },
 603  *      .event                  = &ftrace_event_type_<call>,
 604  *      .print_fmt              = print_fmt_<call>,
 605  *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 606  * };
 607  * // its only safe to use pointers when doing linker tricks to
 608  * // create an array.
 609  * static struct trace_event_call __used
 610  * __section("_ftrace_events") *__event_<call> = &event_<call>;
 611  *
 612  */
 613
 614 #ifdef CONFIG_PERF_EVENTS
 615
 616 #define _TRACE_PERF_PROTO(call, proto)                                  \
 617         static notrace void                                             \
 618         perf_trace_##call(void *__data, proto);
 619
 620 #define _TRACE_PERF_INIT(call)                                          \
 621         .perf_probe             = perf_trace_##call,
 622
 623 #else
 624 #define _TRACE_PERF_PROTO(call, proto)
 625 #define _TRACE_PERF_INIT(call)
 626 #endif /* CONFIG_PERF_EVENTS */
 627
 628 #undef __entry
 629 #define __entry entry
 630
 631 #undef __field
 632 #define __field(type, item)
 633
 634 #undef __field_struct
 635 #define __field_struct(type, item)
 636
 637 #undef __array
 638 #define __array(type, item, len)
 639
 640 #undef __dynamic_array
 641 #define __dynamic_array(type, item, len)                                \
 642         __entry->__data_loc_##item = __data_offsets.item;
 643
 644 #undef __string
 645 #define __string(item, src) __dynamic_array(char, item, -1)
 646
 647 #undef __assign_str
 648 #define __assign_str(dst, src)                                          \
 649         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 650
 651 #undef __bitmask
 652 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 653
 654 #undef __get_bitmask
 655 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 656
 657 #undef __assign_bitmask
 658 #define __assign_bitmask(dst, src, nr_bits)                                     \
 659         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 660
 661 #undef TP_fast_assign
 662 #define TP_fast_assign(args...) args
 663
 664 #undef __perf_count
 665 #define __perf_count(c) (c)
 666
 667 #undef __perf_task
 668 #define __perf_task(t)  (t)
 669
 670 #undef DECLARE_EVENT_CLASS
 671 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 672                                                                         \
 673 static notrace void                                                     \
 674 trace_event_raw_event_##call(void *__data, proto)                       \
 675 {                                                                       \
 676         struct trace_event_file *trace_file = __data;                   \
 677         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 678         struct trace_event_buffer fbuffer;                              \
 679         struct trace_event_raw_##call *entry;                           \
 680         int __data_size;                                                \
 681                                                                         \
 682         if (trace_trigger_soft_disabled(trace_file))                    \
 683                 return;                                                 \
 684                                                                         \
 685         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 686                                                                         \
 687         entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 688                                  sizeof(*entry) + __data_size);         \
 689                                                                         \
 690         if (!entry)                                                     \
 691                 return;                                                 \
 692                                                                         \
 693         tstruct                                                         \
 694                                                                         \
 695         { assign; }                                                     \
 696                                                                         \
 697         trace_event_buffer_commit(&fbuffer);                            \
 698 }
 699 /*
 700  * The ftrace_test_probe is compiled out, it is only here as a build time check
 701  * to make sure that if the tracepoint handling changes, the ftrace probe will
 702  * fail to compile unless it too is updated.
 703  */
 704
 705 #undef DEFINE_EVENT
 706 #define DEFINE_EVENT(template, call, proto, args)                       \
 707 static inline void ftrace_test_probe_##call(void)                       \
 708 {                                                                       \
 709         check_trace_callback_type_##call(trace_event_raw_event_##template); \
 710 }
 711
 712 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 713
 714 #undef __entry
 715 #define __entry REC
 716
 717 #undef __print_flags
 718 #undef __print_symbolic
 719 #undef __print_hex
 720 #undef __print_hex_str
 721 #undef __get_dynamic_array
 722 #undef __get_dynamic_array_len
 723 #undef __get_str
 724 #undef __get_bitmask
 725 #undef __print_array
 726 #undef __print_hex_dump
 727
 728 #undef TP_printk
 729 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 730
 731 #undef DECLARE_EVENT_CLASS
 732 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 733 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 734 static char print_fmt_##call[] = print;                                 \
 735 static struct trace_event_class __used __refdata event_class_##call = { \
 736         .system                 = TRACE_SYSTEM_STRING,                  \
 737         .fields_array           = trace_event_fields_##call,            \
 738         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 739         .raw_init               = trace_event_raw_init,                 \
 740         .probe                  = trace_event_raw_event_##call,         \
 741         .reg                    = trace_event_reg,                      \
 742         _TRACE_PERF_INIT(call)                                          \
 743 };
 744
 745 #undef DEFINE_EVENT
 746 #define DEFINE_EVENT(template, call, proto, args)                       \
 747                                                                         \
 748 static struct trace_event_call __used event_##call = {                  \
 749         .class                  = &event_class_##template,              \
 750         {                                                               \
 751                 .tp                     = &__tracepoint_##call,         \
 752         },                                                              \
 753         .event.funcs            = &trace_event_type_funcs_##template,   \
 754         .print_fmt              = print_fmt_##template,                 \
 755         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 756 };                                                                      \
 757 static struct trace_event_call __used                                   \
 758 __section("_ftrace_events") *__event_##call = &event_##call
 759
 760 #undef DEFINE_EVENT_PRINT
 761 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 762                                                                         \
 763 static char print_fmt_##call[] = print;                                 \
 764                                                                         \
 765 static struct trace_event_call __used event_##call = {                  \
 766         .class                  = &event_class_##template,              \
 767         {                                                               \
 768                 .tp                     = &__tracepoint_##call,         \
 769         },                                                              \
 770         .event.funcs            = &trace_event_type_funcs_##call,       \
 771         .print_fmt              = print_fmt_##call,                     \
 772         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 773 };                                                                      \
 774 static struct trace_event_call __used                                   \
 775 __section("_ftrace_events") *__event_##call = &event_##call
 776
 777 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)