include/trace/ftrace.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 ftrace_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/ftrace_event.h>
  20
  21 /*
  22  * DECLARE_EVENT_CLASS can be used to add a generic function
  23  * handlers for events. That is, if all events have the same
  24  * parameters and just have distinct trace points.
  25  * Each tracepoint can be defined with DEFINE_EVENT and that
  26  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  27  *
  28  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  29  */
  30 #undef TRACE_EVENT
  31 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  32         DECLARE_EVENT_CLASS(name,                              \
  33                              PARAMS(proto),                    \
  34                              PARAMS(args),                     \
  35                              PARAMS(tstruct),                  \
  36                              PARAMS(assign),                   \
  37                              PARAMS(print));                   \
  38         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  39
  40
  41 #undef __field
  42 #define __field(type, item)             type    item;
  43
  44 #undef __field_ext
  45 #define __field_ext(type, item, filter_type)    type    item;
  46
  47 #undef __array
  48 #define __array(type, item, len)        type    item[len];
  49
  50 #undef __dynamic_array
  51 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
  52
  53 #undef __string
  54 #define __string(item, src) __dynamic_array(char, item, -1)
  55
  56 #undef __bitmask
  57 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
  58
  59 #undef TP_STRUCT__entry
  60 #define TP_STRUCT__entry(args...) args
  61
  62 #undef DECLARE_EVENT_CLASS
  63 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
  64         struct ftrace_raw_##name {                                      \
  65                 struct trace_entry      ent;                            \
  66                 tstruct                                                 \
  67                 char                    __data[0];                      \
  68         };                                                              \
  69                                                                         \
  70         static struct ftrace_event_class event_class_##name;
  71
  72 #undef DEFINE_EVENT
  73 #define DEFINE_EVENT(template, name, proto, args)       \
  74         static struct ftrace_event_call __used          \
  75         __attribute__((__aligned__(4))) event_##name
  76
  77 #undef DEFINE_EVENT_PRINT
  78 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  79         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  80
  81 /* Callbacks are meaningless to ftrace. */
  82 #undef TRACE_EVENT_FN
  83 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  84                 assign, print, reg, unreg)                              \
  85         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
  86                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
  87
  88 #undef TRACE_EVENT_FLAGS
  89 #define TRACE_EVENT_FLAGS(name, value)                                  \
  90         __TRACE_EVENT_FLAGS(name, value)
  91
  92 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  93
  94
  95 /*
  96  * Stage 2 of the trace events.
  97  *
  98  * Include the following:
  99  *
 100  * struct ftrace_data_offsets_<call> {
 101  *      u32                             <item1>;
 102  *      u32                             <item2>;
 103  *      [...]
 104  * };
 105  *
 106  * The __dynamic_array() macro will create each u32 <item>, this is
 107  * to keep the offset of each array from the beginning of the event.
 108  * The size of an array is also encoded, in the higher 16 bits of <item>.
 109  */
 110
 111 #undef __field
 112 #define __field(type, item)
 113
 114 #undef __field_ext
 115 #define __field_ext(type, item, filter_type)
 116
 117 #undef __array
 118 #define __array(type, item, len)
 119
 120 #undef __dynamic_array
 121 #define __dynamic_array(type, item, len)        u32 item;
 122
 123 #undef __string
 124 #define __string(item, src) __dynamic_array(char, item, -1)
 125
 126 #undef __bitmask
 127 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 128
 129 #undef DECLARE_EVENT_CLASS
 130 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 131         struct ftrace_data_offsets_##call {                             \
 132                 tstruct;                                                \
 133         };
 134
 135 #undef DEFINE_EVENT
 136 #define DEFINE_EVENT(template, name, proto, args)
 137
 138 #undef DEFINE_EVENT_PRINT
 139 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 140         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 141
 142 #undef TRACE_EVENT_FLAGS
 143 #define TRACE_EVENT_FLAGS(event, flag)
 144
 145 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 146
 147 /*
 148  * Stage 3 of the trace events.
 149  *
 150  * Override the macros in <trace/trace_events.h> to include the following:
 151  *
 152  * enum print_line_t
 153  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 154  * {
 155  *      struct trace_seq *s = &iter->seq;
 156  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 157  *      struct trace_entry *entry;
 158  *      struct trace_seq *p = &iter->tmp_seq;
 159  *      int ret;
 160  *
 161  *      entry = iter->ent;
 162  *
 163  *      if (entry->type != event_<call>->event.type) {
 164  *              WARN_ON_ONCE(1);
 165  *              return TRACE_TYPE_UNHANDLED;
 166  *      }
 167  *
 168  *      field = (typeof(field))entry;
 169  *
 170  *      trace_seq_init(p);
 171  *      ret = trace_seq_printf(s, "%s: ", <call>);
 172  *      if (ret)
 173  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 174  *      if (!ret)
 175  *              return TRACE_TYPE_PARTIAL_LINE;
 176  *
 177  *      return TRACE_TYPE_HANDLED;
 178  * }
 179  *
 180  * This is the method used to print the raw event to the trace
 181  * output format. Note, this is not needed if the data is read
 182  * in binary.
 183  */
 184
 185 #undef __entry
 186 #define __entry field
 187
 188 #undef TP_printk
 189 #define TP_printk(fmt, args...) fmt "\n", args
 190
 191 #undef __get_dynamic_array
 192 #define __get_dynamic_array(field)      \
 193                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 194
 195 #undef __get_str
 196 #define __get_str(field) (char *)__get_dynamic_array(field)
 197
 198 #undef __get_bitmask
 199 #define __get_bitmask(field)                                            \
 200         ({                                                              \
 201                 void *__bitmask = __get_dynamic_array(field);           \
 202                 unsigned int __bitmask_size;                            \
 203                 __bitmask_size = (__entry->__data_loc_##field >> 16) & 0xffff; \
 204                 ftrace_print_bitmask_seq(p, __bitmask, __bitmask_size); \
 205         })
 206
 207 #undef __print_flags
 208 #define __print_flags(flag, delim, flag_array...)                       \
 209         ({                                                              \
 210                 static const struct trace_print_flags __flags[] =       \
 211                         { flag_array, { -1, NULL }};                    \
 212                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 213         })
 214
 215 #undef __print_symbolic
 216 #define __print_symbolic(value, symbol_array...)                        \
 217         ({                                                              \
 218                 static const struct trace_print_flags symbols[] =       \
 219                         { symbol_array, { -1, NULL }};                  \
 220                 ftrace_print_symbols_seq(p, value, symbols);            \
 221         })
 222
 223 #undef __print_symbolic_u64
 224 #if BITS_PER_LONG == 32
 225 #define __print_symbolic_u64(value, symbol_array...)                    \
 226         ({                                                              \
 227                 static const struct trace_print_flags_u64 symbols[] =   \
 228                         { symbol_array, { -1, NULL } };                 \
 229                 ftrace_print_symbols_seq_u64(p, value, symbols);        \
 230         })
 231 #else
 232 #define __print_symbolic_u64(value, symbol_array...)                    \
 233                         __print_symbolic(value, symbol_array)
 234 #endif
 235
 236 #undef __print_hex
 237 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
 238
 239 #undef DECLARE_EVENT_CLASS
 240 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 241 static notrace enum print_line_t                                        \
 242 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 243                          struct trace_event *trace_event)               \
 244 {                                                                       \
 245         struct trace_seq *s = &iter->seq;                               \
 246         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 247         struct ftrace_raw_##call *field;                                \
 248         int ret;                                                        \
 249                                                                         \
 250         field = (typeof(field))iter->ent;                               \
 251                                                                         \
 252         ret = ftrace_raw_output_prep(iter, trace_event);                \
 253         if (ret)                                                        \
 254                 return ret;                                             \
 255                                                                         \
 256         ret = trace_seq_printf(s, print);                               \
 257         if (!ret)                                                       \
 258                 return TRACE_TYPE_PARTIAL_LINE;                         \
 259                                                                         \
 260         return TRACE_TYPE_HANDLED;                                      \
 261 }                                                                       \
 262 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 263         .trace                  = ftrace_raw_output_##call,             \
 264 };
 265
 266 #undef DEFINE_EVENT_PRINT
 267 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 268 static notrace enum print_line_t                                        \
 269 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 270                          struct trace_event *event)                     \
 271 {                                                                       \
 272         struct trace_seq *s = &iter->seq;                               \
 273         struct ftrace_raw_##template *field;                            \
 274         struct trace_entry *entry;                                      \
 275         struct trace_seq *p = &iter->tmp_seq;                           \
 276         int ret;                                                        \
 277                                                                         \
 278         entry = iter->ent;                                              \
 279                                                                         \
 280         if (entry->type != event_##call.event.type) {                   \
 281                 WARN_ON_ONCE(1);                                        \
 282                 return TRACE_TYPE_UNHANDLED;                            \
 283         }                                                               \
 284                                                                         \
 285         field = (typeof(field))entry;                                   \
 286                                                                         \
 287         trace_seq_init(p);                                              \
 288         ret = trace_seq_printf(s, "%s: ", #call);                       \
 289         if (ret)                                                        \
 290                 ret = trace_seq_printf(s, print);                       \
 291         if (!ret)                                                       \
 292                 return TRACE_TYPE_PARTIAL_LINE;                         \
 293                                                                         \
 294         return TRACE_TYPE_HANDLED;                                      \
 295 }                                                                       \
 296 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 297         .trace                  = ftrace_raw_output_##call,             \
 298 };
 299
 300 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 301
 302 #undef __field_ext
 303 #define __field_ext(type, item, filter_type)                            \
 304         ret = trace_define_field(event_call, #type, #item,              \
 305                                  offsetof(typeof(field), item),         \
 306                                  sizeof(field.item),                    \
 307                                  is_signed_type(type), filter_type);    \
 308         if (ret)                                                        \
 309                 return ret;
 310
 311 #undef __field
 312 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 313
 314 #undef __array
 315 #define __array(type, item, len)                                        \
 316         do {                                                            \
 317                 char *type_str = #type"["__stringify(len)"]";           \
 318                 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
 319                 ret = trace_define_field(event_call, type_str, #item,   \
 320                                  offsetof(typeof(field), item),         \
 321                                  sizeof(field.item),                    \
 322                                  is_signed_type(type), FILTER_OTHER);   \
 323                 if (ret)                                                \
 324                         return ret;                                     \
 325         } while (0);
 326
 327 #undef __dynamic_array
 328 #define __dynamic_array(type, item, len)                                       \
 329         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 330                                  offsetof(typeof(field), __data_loc_##item),   \
 331                                  sizeof(field.__data_loc_##item),              \
 332                                  is_signed_type(type), FILTER_OTHER);
 333
 334 #undef __string
 335 #define __string(item, src) __dynamic_array(char, item, -1)
 336
 337 #undef __bitmask
 338 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 339
 340 #undef DECLARE_EVENT_CLASS
 341 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 342 static int notrace __init                                               \
 343 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 344 {                                                                       \
 345         struct ftrace_raw_##call field;                                 \
 346         int ret;                                                        \
 347                                                                         \
 348         tstruct;                                                        \
 349                                                                         \
 350         return ret;                                                     \
 351 }
 352
 353 #undef DEFINE_EVENT
 354 #define DEFINE_EVENT(template, name, proto, args)
 355
 356 #undef DEFINE_EVENT_PRINT
 357 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 358         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 359
 360 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 361
 362 /*
 363  * remember the offset of each array from the beginning of the event.
 364  */
 365
 366 #undef __entry
 367 #define __entry entry
 368
 369 #undef __field
 370 #define __field(type, item)
 371
 372 #undef __field_ext
 373 #define __field_ext(type, item, filter_type)
 374
 375 #undef __array
 376 #define __array(type, item, len)
 377
 378 #undef __dynamic_array
 379 #define __dynamic_array(type, item, len)                                \
 380         __data_offsets->item = __data_size +                            \
 381                                offsetof(typeof(*entry), __data);        \
 382         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 383         __data_size += (len) * sizeof(type);
 384
 385 #undef __string
 386 #define __string(item, src) __dynamic_array(char, item,                 \
 387                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 388
 389 /*
 390  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 391  * num_possible_cpus().
 392  */
 393 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 394         (((nr_bits) + 7) / 8)
 395
 396 #define __bitmask_size_in_longs(nr_bits)                        \
 397         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 398           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 399
 400 /*
 401  * __bitmask_size_in_bytes is the number of bytes needed to hold
 402  * num_possible_cpus() padded out to the nearest long. This is what
 403  * is saved in the buffer, just to be consistent.
 404  */
 405 #define __bitmask_size_in_bytes(nr_bits)                                \
 406         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 407
 408 #undef __bitmask
 409 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 410                                          __bitmask_size_in_longs(nr_bits))
 411
 412 #undef DECLARE_EVENT_CLASS
 413 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 414 static inline notrace int ftrace_get_offsets_##call(                    \
 415         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 416 {                                                                       \
 417         int __data_size = 0;                                            \
 418         struct ftrace_raw_##call __maybe_unused *entry;                 \
 419                                                                         \
 420         tstruct;                                                        \
 421                                                                         \
 422         return __data_size;                                             \
 423 }
 424
 425 #undef DEFINE_EVENT
 426 #define DEFINE_EVENT(template, name, proto, args)
 427
 428 #undef DEFINE_EVENT_PRINT
 429 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 430         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 431
 432 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 433
 434 /*
 435  * Stage 4 of the trace events.
 436  *
 437  * Override the macros in <trace/trace_events.h> to include the following:
 438  *
 439  * For those macros defined with TRACE_EVENT:
 440  *
 441  * static struct ftrace_event_call event_<call>;
 442  *
 443  * static void ftrace_raw_event_<call>(void *__data, proto)
 444  * {
 445  *      struct ftrace_event_file *ftrace_file = __data;
 446  *      struct ftrace_event_call *event_call = ftrace_file->event_call;
 447  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 448  *      struct ring_buffer_event *event;
 449  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 450  *      struct ring_buffer *buffer;
 451  *      unsigned long irq_flags;
 452  *      int __data_size;
 453  *      int pc;
 454  *
 455  *      if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
 456  *                   &ftrace_file->flags))
 457  *              return;
 458  *
 459  *      local_save_flags(irq_flags);
 460  *      pc = preempt_count();
 461  *
 462  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 463  *
 464  *      event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
 465  *                                event_<call>->event.type,
 466  *                                sizeof(*entry) + __data_size,
 467  *                                irq_flags, pc);
 468  *      if (!event)
 469  *              return;
 470  *      entry   = ring_buffer_event_data(event);
 471  *
 472  *      { <assign>; }  <-- Here we assign the entries by the __field and
 473  *                         __array macros.
 474  *
 475  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
 476  *              trace_nowake_buffer_unlock_commit(buffer,
 477  *                                                 event, irq_flags, pc);
 478  * }
 479  *
 480  * static struct trace_event ftrace_event_type_<call> = {
 481  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 482  * };
 483  *
 484  * static const char print_fmt_<call>[] = <TP_printk>;
 485  *
 486  * static struct ftrace_event_class __used event_class_<template> = {
 487  *      .system                 = "<system>",
 488  *      .define_fields          = ftrace_define_fields_<call>,
 489  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 490  *      .raw_init               = trace_event_raw_init,
 491  *      .probe                  = ftrace_raw_event_##call,
 492  *      .reg                    = ftrace_event_reg,
 493  * };
 494  *
 495  * static struct ftrace_event_call event_<call> = {
 496  *      .name                   = "<call>",
 497  *      .class                  = event_class_<template>,
 498  *      .event                  = &ftrace_event_type_<call>,
 499  *      .print_fmt              = print_fmt_<call>,
 500  * };
 501  * // its only safe to use pointers when doing linker tricks to
 502  * // create an array.
 503  * static struct ftrace_event_call __used
 504  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 505  *
 506  */
 507
 508 #ifdef CONFIG_PERF_EVENTS
 509
 510 #define _TRACE_PERF_PROTO(call, proto)                                  \
 511         static notrace void                                             \
 512         perf_trace_##call(void *__data, proto);
 513
 514 #define _TRACE_PERF_INIT(call)                                          \
 515         .perf_probe             = perf_trace_##call,
 516
 517 #else
 518 #define _TRACE_PERF_PROTO(call, proto)
 519 #define _TRACE_PERF_INIT(call)
 520 #endif /* CONFIG_PERF_EVENTS */
 521
 522 #undef __entry
 523 #define __entry entry
 524
 525 #undef __field
 526 #define __field(type, item)
 527
 528 #undef __array
 529 #define __array(type, item, len)
 530
 531 #undef __dynamic_array
 532 #define __dynamic_array(type, item, len)                                \
 533         __entry->__data_loc_##item = __data_offsets.item;
 534
 535 #undef __string
 536 #define __string(item, src) __dynamic_array(char, item, -1)
 537
 538 #undef __assign_str
 539 #define __assign_str(dst, src)                                          \
 540         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 541
 542 #undef __bitmask
 543 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 544
 545 #undef __get_bitmask
 546 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 547
 548 #undef __assign_bitmask
 549 #define __assign_bitmask(dst, src, nr_bits)                                     \
 550         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 551
 552 #undef TP_fast_assign
 553 #define TP_fast_assign(args...) args
 554
 555 #undef TP_perf_assign
 556 #define TP_perf_assign(args...)
 557
 558 #undef DECLARE_EVENT_CLASS
 559 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 560                                                                         \
 561 static notrace void                                                     \
 562 ftrace_raw_event_##call(void *__data, proto)                            \
 563 {                                                                       \
 564         struct ftrace_event_file *ftrace_file = __data;                 \
 565         struct ftrace_event_call *event_call = ftrace_file->event_call; \
 566         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 567         struct ring_buffer_event *event;                                \
 568         struct ftrace_raw_##call *entry;                                \
 569         struct ring_buffer *buffer;                                     \
 570         unsigned long irq_flags;                                        \
 571         int __data_size;                                                \
 572         int pc;                                                         \
 573                                                                         \
 574         if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,                 \
 575                      &ftrace_file->flags))                              \
 576                 return;                                                 \
 577                                                                         \
 578         local_save_flags(irq_flags);                                    \
 579         pc = preempt_count();                                           \
 580                                                                         \
 581         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 582                                                                         \
 583         event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,   \
 584                                  event_call->event.type,                \
 585                                  sizeof(*entry) + __data_size,          \
 586                                  irq_flags, pc);                        \
 587         if (!event)                                                     \
 588                 return;                                                 \
 589         entry   = ring_buffer_event_data(event);                        \
 590                                                                         \
 591         tstruct                                                         \
 592                                                                         \
 593         { assign; }                                                     \
 594                                                                         \
 595         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 596                 trace_buffer_unlock_commit(buffer, event, irq_flags, pc); \
 597 }
 598 /*
 599  * The ftrace_test_probe is compiled out, it is only here as a build time check
 600  * to make sure that if the tracepoint handling changes, the ftrace probe will
 601  * fail to compile unless it too is updated.
 602  */
 603
 604 #undef DEFINE_EVENT
 605 #define DEFINE_EVENT(template, call, proto, args)                       \
 606 static inline void ftrace_test_probe_##call(void)                       \
 607 {                                                                       \
 608         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
 609 }
 610
 611 #undef DEFINE_EVENT_PRINT
 612 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 613
 614 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 615
 616 #undef __entry
 617 #define __entry REC
 618
 619 #undef __print_flags
 620 #undef __print_symbolic
 621 #undef __print_hex
 622 #undef __get_dynamic_array
 623 #undef __get_str
 624 #undef __get_bitmask
 625
 626 #undef TP_printk
 627 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 628
 629 #undef DECLARE_EVENT_CLASS
 630 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 631 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 632 static const char print_fmt_##call[] = print;                           \
 633 static struct ftrace_event_class __used __refdata event_class_##call = { \
 634         .system                 = __stringify(TRACE_SYSTEM),            \
 635         .define_fields          = ftrace_define_fields_##call,          \
 636         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 637         .raw_init               = trace_event_raw_init,                 \
 638         .probe                  = ftrace_raw_event_##call,              \
 639         .reg                    = ftrace_event_reg,                     \
 640         _TRACE_PERF_INIT(call)                                          \
 641 };
 642
 643 #undef DEFINE_EVENT
 644 #define DEFINE_EVENT(template, call, proto, args)                       \
 645                                                                         \
 646 static struct ftrace_event_call __used event_##call = {                 \
 647         .name                   = #call,                                \
 648         .class                  = &event_class_##template,              \
 649         .event.funcs            = &ftrace_event_type_funcs_##template,  \
 650         .print_fmt              = print_fmt_##template,                 \
 651 };                                                                      \
 652 static struct ftrace_event_call __used                                  \
 653 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 654
 655 #undef DEFINE_EVENT_PRINT
 656 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 657                                                                         \
 658 static const char print_fmt_##call[] = print;                           \
 659                                                                         \
 660 static struct ftrace_event_call __used event_##call = {                 \
 661         .name                   = #call,                                \
 662         .class                  = &event_class_##template,              \
 663         .event.funcs            = &ftrace_event_type_funcs_##call,      \
 664         .print_fmt              = print_fmt_##call,                     \
 665 };                                                                      \
 666 static struct ftrace_event_call __used                                  \
 667 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 668
 669 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 670
 671
 672 #ifdef CONFIG_PERF_EVENTS
 673
 674 #undef __entry
 675 #define __entry entry
 676
 677 #undef __get_dynamic_array
 678 #define __get_dynamic_array(field)      \
 679                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 680
 681 #undef __get_str
 682 #define __get_str(field) (char *)__get_dynamic_array(field)
 683
 684 #undef __get_bitmask
 685 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 686
 687 #undef __perf_addr
 688 #define __perf_addr(a) __addr = (a)
 689
 690 #undef __perf_count
 691 #define __perf_count(c) __count = (c)
 692
 693 #undef __perf_task
 694 #define __perf_task(t) __task = (t)
 695
 696 #undef TP_perf_assign
 697 #define TP_perf_assign(args...) args
 698
 699 #undef DECLARE_EVENT_CLASS
 700 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 701 static notrace void                                                     \
 702 perf_trace_##call(void *__data, proto)                                  \
 703 {                                                                       \
 704         struct ftrace_event_call *event_call = __data;                  \
 705         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 706         struct ftrace_raw_##call *entry;                                \
 707         struct pt_regs __regs;                                          \
 708         u64 __addr = 0, __count = 1;                                    \
 709         struct task_struct *__task = NULL;                              \
 710         struct hlist_head *head;                                        \
 711         int __entry_size;                                               \
 712         int __data_size;                                                \
 713         int rctx;                                                       \
 714                                                                         \
 715         perf_fetch_caller_regs(&__regs);                                \
 716                                                                         \
 717         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 718         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 719                              sizeof(u64));                              \
 720         __entry_size -= sizeof(u32);                                    \
 721                                                                         \
 722         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
 723                       "profile buffer not large enough"))               \
 724                 return;                                                 \
 725                                                                         \
 726         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
 727                 __entry_size, event_call->event.type, &__regs, &rctx);  \
 728         if (!entry)                                                     \
 729                 return;                                                 \
 730                                                                         \
 731         tstruct                                                         \
 732                                                                         \
 733         { assign; }                                                     \
 734                                                                         \
 735         head = this_cpu_ptr(event_call->perf_events);                   \
 736         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 737                 __count, &__regs, head, __task);                        \
 738 }
 739
 740 /*
 741  * This part is compiled out, it is only here as a build time check
 742  * to make sure that if the tracepoint handling changes, the
 743  * perf probe will fail to compile unless it too is updated.
 744  */
 745 #undef DEFINE_EVENT
 746 #define DEFINE_EVENT(template, call, proto, args)                       \
 747 static inline void perf_test_probe_##call(void)                         \
 748 {                                                                       \
 749         check_trace_callback_type_##call(perf_trace_##template);        \
 750 }
 751
 752
 753 #undef DEFINE_EVENT_PRINT
 754 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 755         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 756
 757 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 758 #endif /* CONFIG_PERF_EVENTS */
 759