include/trace/trace_events.h

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