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_seq *p = &iter->tmp_seq;
 235  *
 236  * -------(for event)-------
 237  *
 238  *      struct trace_entry *entry;
 239  *
 240  *      entry = iter->ent;
 241  *
 242  *      if (entry->type != event_<call>->event.type) {
 243  *              WARN_ON_ONCE(1);
 244  *              return TRACE_TYPE_UNHANDLED;
 245  *      }
 246  *
 247  *      field = (typeof(field))entry;
 248  *
 249  *      trace_seq_init(p);
 250  *      return trace_output_call(iter, <call>, <TP_printk> "\n");
 251  *
 252  * ------(or, for event class)------
 253  *
 254  *      int ret;
 255  *
 256  *      field = (typeof(field))iter->ent;
 257  *
 258  *      ret = trace_raw_output_prep(iter, trace_event);
 259  *      if (ret != TRACE_TYPE_HANDLED)
 260  *              return ret;
 261  *
 262  *      trace_event_printf(iter, <TP_printk> "\n");
 263  *
 264  *      return trace_handle_return(s);
 265  * -------
 266  *  }
 267  *
 268  * This is the method used to print the raw event to the trace
 269  * output format. Note, this is not needed if the data is read
 270  * in binary.
 271  */
 272
 273 #undef __entry
 274 #define __entry field
 275
 276 #undef TP_printk
 277 #define TP_printk(fmt, args...) fmt "\n", args
 278
 279 #undef __get_dynamic_array
 280 #define __get_dynamic_array(field)      \
 281                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 282
 283 #undef __get_dynamic_array_len
 284 #define __get_dynamic_array_len(field)  \
 285                 ((__entry->__data_loc_##field >> 16) & 0xffff)
 286
 287 #undef __get_str
 288 #define __get_str(field) ((char *)__get_dynamic_array(field))
 289
 290 #undef __get_bitmask
 291 #define __get_bitmask(field)                                            \
 292         ({                                                              \
 293                 void *__bitmask = __get_dynamic_array(field);           \
 294                 unsigned int __bitmask_size;                            \
 295                 __bitmask_size = __get_dynamic_array_len(field);        \
 296                 trace_print_bitmask_seq(p, __bitmask, __bitmask_size);  \
 297         })
 298
 299 #undef __print_flags
 300 #define __print_flags(flag, delim, flag_array...)                       \
 301         ({                                                              \
 302                 static const struct trace_print_flags __flags[] =       \
 303                         { flag_array, { -1, NULL }};                    \
 304                 trace_print_flags_seq(p, delim, flag, __flags); \
 305         })
 306
 307 #undef __print_symbolic
 308 #define __print_symbolic(value, symbol_array...)                        \
 309         ({                                                              \
 310                 static const struct trace_print_flags symbols[] =       \
 311                         { symbol_array, { -1, NULL }};                  \
 312                 trace_print_symbols_seq(p, value, symbols);             \
 313         })
 314
 315 #undef __print_flags_u64
 316 #undef __print_symbolic_u64
 317 #if BITS_PER_LONG == 32
 318 #define __print_flags_u64(flag, delim, flag_array...)                   \
 319         ({                                                              \
 320                 static const struct trace_print_flags_u64 __flags[] =   \
 321                         { flag_array, { -1, NULL } };                   \
 322                 trace_print_flags_seq_u64(p, delim, flag, __flags);     \
 323         })
 324
 325 #define __print_symbolic_u64(value, symbol_array...)                    \
 326         ({                                                              \
 327                 static const struct trace_print_flags_u64 symbols[] =   \
 328                         { symbol_array, { -1, NULL } };                 \
 329                 trace_print_symbols_seq_u64(p, value, symbols); \
 330         })
 331 #else
 332 #define __print_flags_u64(flag, delim, flag_array...)                   \
 333                         __print_flags(flag, delim, flag_array)
 334
 335 #define __print_symbolic_u64(value, symbol_array...)                    \
 336                         __print_symbolic(value, symbol_array)
 337 #endif
 338
 339 #undef __print_hex
 340 #define __print_hex(buf, buf_len)                                       \
 341         trace_print_hex_seq(p, buf, buf_len, false)
 342
 343 #undef __print_hex_str
 344 #define __print_hex_str(buf, buf_len)                                   \
 345         trace_print_hex_seq(p, buf, buf_len, true)
 346
 347 #undef __print_array
 348 #define __print_array(array, count, el_size)                            \
 349         ({                                                              \
 350                 BUILD_BUG_ON(el_size != 1 && el_size != 2 &&            \
 351                              el_size != 4 && el_size != 8);             \
 352                 trace_print_array_seq(p, array, count, el_size);        \
 353         })
 354
 355 #undef __print_hex_dump
 356 #define __print_hex_dump(prefix_str, prefix_type,                       \
 357                          rowsize, groupsize, buf, len, ascii)           \
 358         trace_print_hex_dump_seq(p, prefix_str, prefix_type,            \
 359                                  rowsize, groupsize, buf, len, ascii)
 360
 361 #undef __print_ns_to_secs
 362 #define __print_ns_to_secs(value)                       \
 363         ({                                              \
 364                 u64 ____val = (u64)(value);             \
 365                 do_div(____val, NSEC_PER_SEC);          \
 366                 ____val;                                \
 367         })
 368
 369 #undef __print_ns_without_secs
 370 #define __print_ns_without_secs(value)                  \
 371         ({                                              \
 372                 u64 ____val = (u64)(value);             \
 373                 (u32) do_div(____val, NSEC_PER_SEC);    \
 374         })
 375
 376 #undef DECLARE_EVENT_CLASS
 377 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 378 static notrace enum print_line_t                                        \
 379 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 380                         struct trace_event *trace_event)                \
 381 {                                                                       \
 382         struct trace_seq *s = &iter->seq;                               \
 383         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 384         struct trace_event_raw_##call *field;                           \
 385         int ret;                                                        \
 386                                                                         \
 387         field = (typeof(field))iter->ent;                               \
 388                                                                         \
 389         ret = trace_raw_output_prep(iter, trace_event);                 \
 390         if (ret != TRACE_TYPE_HANDLED)                                  \
 391                 return ret;                                             \
 392                                                                         \
 393         trace_event_printf(iter, print);                                \
 394                                                                         \
 395         return trace_handle_return(s);                                  \
 396 }                                                                       \
 397 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 398         .trace                  = trace_raw_output_##call,              \
 399 };
 400
 401 #undef DEFINE_EVENT_PRINT
 402 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 403 static notrace enum print_line_t                                        \
 404 trace_raw_output_##call(struct trace_iterator *iter, int flags,         \
 405                          struct trace_event *event)                     \
 406 {                                                                       \
 407         struct trace_event_raw_##template *field;                       \
 408         struct trace_entry *entry;                                      \
 409         struct trace_seq *p = &iter->tmp_seq;                           \
 410                                                                         \
 411         entry = iter->ent;                                              \
 412                                                                         \
 413         if (entry->type != event_##call.event.type) {                   \
 414                 WARN_ON_ONCE(1);                                        \
 415                 return TRACE_TYPE_UNHANDLED;                            \
 416         }                                                               \
 417                                                                         \
 418         field = (typeof(field))entry;                                   \
 419                                                                         \
 420         trace_seq_init(p);                                              \
 421         return trace_output_call(iter, #call, print);                   \
 422 }                                                                       \
 423 static struct trace_event_functions trace_event_type_funcs_##call = {   \
 424         .trace                  = trace_raw_output_##call,              \
 425 };
 426
 427 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 428
 429 #undef __field_ext
 430 #define __field_ext(_type, _item, _filter_type) {                       \
 431         .type = #_type, .name = #_item,                                 \
 432         .size = sizeof(_type), .align = __alignof__(_type),             \
 433         .is_signed = is_signed_type(_type), .filter_type = _filter_type },
 434
 435 #undef __field_struct_ext
 436 #define __field_struct_ext(_type, _item, _filter_type) {                \
 437         .type = #_type, .name = #_item,                                 \
 438         .size = sizeof(_type), .align = __alignof__(_type),             \
 439         0, .filter_type = _filter_type },
 440
 441 #undef __field
 442 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 443
 444 #undef __field_struct
 445 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 446
 447 #undef __array
 448 #define __array(_type, _item, _len) {                                   \
 449         .type = #_type"["__stringify(_len)"]", .name = #_item,          \
 450         .size = sizeof(_type[_len]), .align = __alignof__(_type),       \
 451         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 452
 453 #undef __dynamic_array
 454 #define __dynamic_array(_type, _item, _len) {                           \
 455         .type = "__data_loc " #_type "[]", .name = #_item,              \
 456         .size = 4, .align = 4,                                          \
 457         .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
 458
 459 #undef __string
 460 #define __string(item, src) __dynamic_array(char, item, -1)
 461
 462 #undef __bitmask
 463 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 464
 465 #undef DECLARE_EVENT_CLASS
 466 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 467 static struct trace_event_fields trace_event_fields_##call[] = {        \
 468         tstruct                                                         \
 469         {} };
 470
 471 #undef DEFINE_EVENT_PRINT
 472 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 473
 474 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 475
 476 /*
 477  * remember the offset of each array from the beginning of the event.
 478  */
 479
 480 #undef __entry
 481 #define __entry entry
 482
 483 #undef __field
 484 #define __field(type, item)
 485
 486 #undef __field_ext
 487 #define __field_ext(type, item, filter_type)
 488
 489 #undef __field_struct
 490 #define __field_struct(type, item)
 491
 492 #undef __field_struct_ext
 493 #define __field_struct_ext(type, item, filter_type)
 494
 495 #undef __array
 496 #define __array(type, item, len)
 497
 498 #undef __dynamic_array
 499 #define __dynamic_array(type, item, len)                                \
 500         __item_length = (len) * sizeof(type);                           \
 501         __data_offsets->item = __data_size +                            \
 502                                offsetof(typeof(*entry), __data);        \
 503         __data_offsets->item |= __item_length << 16;                    \
 504         __data_size += __item_length;
 505
 506 #undef __string
 507 #define __string(item, src) __dynamic_array(char, item,                 \
 508                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 509
 510 /*
 511  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 512  * num_possible_cpus().
 513  */
 514 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 515         (((nr_bits) + 7) / 8)
 516
 517 #define __bitmask_size_in_longs(nr_bits)                        \
 518         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 519           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 520
 521 /*
 522  * __bitmask_size_in_bytes is the number of bytes needed to hold
 523  * num_possible_cpus() padded out to the nearest long. This is what
 524  * is saved in the buffer, just to be consistent.
 525  */
 526 #define __bitmask_size_in_bytes(nr_bits)                                \
 527         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 528
 529 #undef __bitmask
 530 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 531                                          __bitmask_size_in_longs(nr_bits))
 532
 533 #undef DECLARE_EVENT_CLASS
 534 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 535 static inline notrace int trace_event_get_offsets_##call(               \
 536         struct trace_event_data_offsets_##call *__data_offsets, proto)  \
 537 {                                                                       \
 538         int __data_size = 0;                                            \
 539         int __maybe_unused __item_length;                               \
 540         struct trace_event_raw_##call __maybe_unused *entry;            \
 541                                                                         \
 542         tstruct;                                                        \
 543                                                                         \
 544         return __data_size;                                             \
 545 }
 546
 547 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 548
 549 /*
 550  * Stage 4 of the trace events.
 551  *
 552  * Override the macros in the event tracepoint header <trace/events/XXX.h>
 553  * to include the following:
 554  *
 555  * For those macros defined with TRACE_EVENT:
 556  *
 557  * static struct trace_event_call event_<call>;
 558  *
 559  * static void trace_event_raw_event_<call>(void *__data, proto)
 560  * {
 561  *      struct trace_event_file *trace_file = __data;
 562  *      struct trace_event_call *event_call = trace_file->event_call;
 563  *      struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
 564  *      unsigned long eflags = trace_file->flags;
 565  *      enum event_trigger_type __tt = ETT_NONE;
 566  *      struct ring_buffer_event *event;
 567  *      struct trace_event_raw_<call> *entry; <-- defined in stage 1
 568  *      struct trace_buffer *buffer;
 569  *      unsigned long irq_flags;
 570  *      int __data_size;
 571  *      int pc;
 572  *
 573  *      if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
 574  *              if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
 575  *                      event_triggers_call(trace_file, NULL);
 576  *              if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
 577  *                      return;
 578  *      }
 579  *
 580  *      local_save_flags(irq_flags);
 581  *      pc = preempt_count();
 582  *
 583  *      __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
 584  *
 585  *      event = trace_event_buffer_lock_reserve(&buffer, trace_file,
 586  *                                event_<call>->event.type,
 587  *                                sizeof(*entry) + __data_size,
 588  *                                irq_flags, pc);
 589  *      if (!event)
 590  *              return;
 591  *      entry   = ring_buffer_event_data(event);
 592  *
 593  *      { <assign>; }  <-- Here we assign the entries by the __field and
 594  *                         __array macros.
 595  *
 596  *      if (eflags & EVENT_FILE_FL_TRIGGER_COND)
 597  *              __tt = event_triggers_call(trace_file, entry);
 598  *
 599  *      if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
 600  *                   &trace_file->flags))
 601  *              ring_buffer_discard_commit(buffer, event);
 602  *      else if (!filter_check_discard(trace_file, entry, buffer, event))
 603  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 604  *
 605  *      if (__tt)
 606  *              event_triggers_post_call(trace_file, __tt);
 607  * }
 608  *
 609  * static struct trace_event ftrace_event_type_<call> = {
 610  *      .trace                  = trace_raw_output_<call>, <-- stage 2
 611  * };
 612  *
 613  * static char print_fmt_<call>[] = <TP_printk>;
 614  *
 615  * static struct trace_event_class __used event_class_<template> = {
 616  *      .system                 = "<system>",
 617  *      .fields_array           = trace_event_fields_<call>,
 618  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 619  *      .raw_init               = trace_event_raw_init,
 620  *      .probe                  = trace_event_raw_event_##call,
 621  *      .reg                    = trace_event_reg,
 622  * };
 623  *
 624  * static struct trace_event_call event_<call> = {
 625  *      .class                  = event_class_<template>,
 626  *      {
 627  *              .tp                     = &__tracepoint_<call>,
 628  *      },
 629  *      .event                  = &ftrace_event_type_<call>,
 630  *      .print_fmt              = print_fmt_<call>,
 631  *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 632  * };
 633  * // its only safe to use pointers when doing linker tricks to
 634  * // create an array.
 635  * static struct trace_event_call __used
 636  * __section("_ftrace_events") *__event_<call> = &event_<call>;
 637  *
 638  */
 639
 640 #ifdef CONFIG_PERF_EVENTS
 641
 642 #define _TRACE_PERF_PROTO(call, proto)                                  \
 643         static notrace void                                             \
 644         perf_trace_##call(void *__data, proto);
 645
 646 #define _TRACE_PERF_INIT(call)                                          \
 647         .perf_probe             = perf_trace_##call,
 648
 649 #else
 650 #define _TRACE_PERF_PROTO(call, proto)
 651 #define _TRACE_PERF_INIT(call)
 652 #endif /* CONFIG_PERF_EVENTS */
 653
 654 #undef __entry
 655 #define __entry entry
 656
 657 #undef __field
 658 #define __field(type, item)
 659
 660 #undef __field_struct
 661 #define __field_struct(type, item)
 662
 663 #undef __array
 664 #define __array(type, item, len)
 665
 666 #undef __dynamic_array
 667 #define __dynamic_array(type, item, len)                                \
 668         __entry->__data_loc_##item = __data_offsets.item;
 669
 670 #undef __string
 671 #define __string(item, src) __dynamic_array(char, item, -1)
 672
 673 #undef __assign_str
 674 #define __assign_str(dst, src)                                          \
 675         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 676
 677 #undef __bitmask
 678 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 679
 680 #undef __get_bitmask
 681 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 682
 683 #undef __assign_bitmask
 684 #define __assign_bitmask(dst, src, nr_bits)                                     \
 685         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 686
 687 #undef TP_fast_assign
 688 #define TP_fast_assign(args...) args
 689
 690 #undef __perf_count
 691 #define __perf_count(c) (c)
 692
 693 #undef __perf_task
 694 #define __perf_task(t)  (t)
 695
 696 #undef DECLARE_EVENT_CLASS
 697 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 698                                                                         \
 699 static notrace void                                                     \
 700 trace_event_raw_event_##call(void *__data, proto)                       \
 701 {                                                                       \
 702         struct trace_event_file *trace_file = __data;                   \
 703         struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
 704         struct trace_event_buffer fbuffer;                              \
 705         struct trace_event_raw_##call *entry;                           \
 706         int __data_size;                                                \
 707                                                                         \
 708         if (trace_trigger_soft_disabled(trace_file))                    \
 709                 return;                                                 \
 710                                                                         \
 711         __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
 712                                                                         \
 713         entry = trace_event_buffer_reserve(&fbuffer, trace_file,        \
 714                                  sizeof(*entry) + __data_size);         \
 715                                                                         \
 716         if (!entry)                                                     \
 717                 return;                                                 \
 718                                                                         \
 719         tstruct                                                         \
 720                                                                         \
 721         { assign; }                                                     \
 722                                                                         \
 723         trace_event_buffer_commit(&fbuffer);                            \
 724 }
 725 /*
 726  * The ftrace_test_probe is compiled out, it is only here as a build time check
 727  * to make sure that if the tracepoint handling changes, the ftrace probe will
 728  * fail to compile unless it too is updated.
 729  */
 730
 731 #undef DEFINE_EVENT
 732 #define DEFINE_EVENT(template, call, proto, args)                       \
 733 static inline void ftrace_test_probe_##call(void)                       \
 734 {                                                                       \
 735         check_trace_callback_type_##call(trace_event_raw_event_##template); \
 736 }
 737
 738 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 739
 740 #undef __entry
 741 #define __entry REC
 742
 743 #undef __print_flags
 744 #undef __print_symbolic
 745 #undef __print_hex
 746 #undef __print_hex_str
 747 #undef __get_dynamic_array
 748 #undef __get_dynamic_array_len
 749 #undef __get_str
 750 #undef __get_bitmask
 751 #undef __print_array
 752 #undef __print_hex_dump
 753
 754 /*
 755  * The below is not executed in the kernel. It is only what is
 756  * displayed in the print format for userspace to parse.
 757  */
 758 #undef __print_ns_to_secs
 759 #define __print_ns_to_secs(val) (val) / 1000000000UL
 760
 761 #undef __print_ns_without_secs
 762 #define __print_ns_without_secs(val) (val) % 1000000000UL
 763
 764 #undef TP_printk
 765 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 766
 767 #undef DECLARE_EVENT_CLASS
 768 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 769 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 770 static char print_fmt_##call[] = print;                                 \
 771 static struct trace_event_class __used __refdata event_class_##call = { \
 772         .system                 = TRACE_SYSTEM_STRING,                  \
 773         .fields_array           = trace_event_fields_##call,            \
 774         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 775         .raw_init               = trace_event_raw_init,                 \
 776         .probe                  = trace_event_raw_event_##call,         \
 777         .reg                    = trace_event_reg,                      \
 778         _TRACE_PERF_INIT(call)                                          \
 779 };
 780
 781 #undef DEFINE_EVENT
 782 #define DEFINE_EVENT(template, call, proto, args)                       \
 783                                                                         \
 784 static struct trace_event_call __used event_##call = {                  \
 785         .class                  = &event_class_##template,              \
 786         {                                                               \
 787                 .tp                     = &__tracepoint_##call,         \
 788         },                                                              \
 789         .event.funcs            = &trace_event_type_funcs_##template,   \
 790         .print_fmt              = print_fmt_##template,                 \
 791         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 792 };                                                                      \
 793 static struct trace_event_call __used                                   \
 794 __section("_ftrace_events") *__event_##call = &event_##call
 795
 796 #undef DEFINE_EVENT_PRINT
 797 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 798                                                                         \
 799 static char print_fmt_##call[] = print;                                 \
 800                                                                         \
 801 static struct trace_event_call __used event_##call = {                  \
 802         .class                  = &event_class_##template,              \
 803         {                                                               \
 804                 .tp                     = &__tracepoint_##call,         \
 805         },                                                              \
 806         .event.funcs            = &trace_event_type_funcs_##call,       \
 807         .print_fmt              = print_fmt_##call,                     \
 808         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 809 };                                                                      \
 810 static struct trace_event_call __used                                   \
 811 __section("_ftrace_events") *__event_##call = &event_##call
 812
 813 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)