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