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 __field_struct
  48 #define __field_struct(type, item)      type    item;
  49
  50 #undef __field_struct_ext
  51 #define __field_struct_ext(type, item, filter_type)     type    item;
  52
  53 #undef __array
  54 #define __array(type, item, len)        type    item[len];
  55
  56 #undef __dynamic_array
  57 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
  58
  59 #undef __string
  60 #define __string(item, src) __dynamic_array(char, item, -1)
  61
  62 #undef __bitmask
  63 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
  64
  65 #undef TP_STRUCT__entry
  66 #define TP_STRUCT__entry(args...) args
  67
  68 #undef DECLARE_EVENT_CLASS
  69 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
  70         struct ftrace_raw_##name {                                      \
  71                 struct trace_entry      ent;                            \
  72                 tstruct                                                 \
  73                 char                    __data[0];                      \
  74         };                                                              \
  75                                                                         \
  76         static struct ftrace_event_class event_class_##name;
  77
  78 #undef DEFINE_EVENT
  79 #define DEFINE_EVENT(template, name, proto, args)       \
  80         static struct ftrace_event_call __used          \
  81         __attribute__((__aligned__(4))) event_##name
  82
  83 #undef DEFINE_EVENT_FN
  84 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
  85         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  86
  87 #undef DEFINE_EVENT_PRINT
  88 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  89         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  90
  91 /* Callbacks are meaningless to ftrace. */
  92 #undef TRACE_EVENT_FN
  93 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  94                 assign, print, reg, unreg)                              \
  95         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
  96                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
  97
  98 #undef TRACE_EVENT_FLAGS
  99 #define TRACE_EVENT_FLAGS(name, value)                                  \
 100         __TRACE_EVENT_FLAGS(name, value)
 101
 102 #undef TRACE_EVENT_PERF_PERM
 103 #define TRACE_EVENT_PERF_PERM(name, expr...)                            \
 104         __TRACE_EVENT_PERF_PERM(name, expr)
 105
 106 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 107
 108
 109 /*
 110  * Stage 2 of the trace events.
 111  *
 112  * Include the following:
 113  *
 114  * struct ftrace_data_offsets_<call> {
 115  *      u32                             <item1>;
 116  *      u32                             <item2>;
 117  *      [...]
 118  * };
 119  *
 120  * The __dynamic_array() macro will create each u32 <item>, this is
 121  * to keep the offset of each array from the beginning of the event.
 122  * The size of an array is also encoded, in the higher 16 bits of <item>.
 123  */
 124
 125 #undef __field
 126 #define __field(type, item)
 127
 128 #undef __field_ext
 129 #define __field_ext(type, item, filter_type)
 130
 131 #undef __field_struct
 132 #define __field_struct(type, item)
 133
 134 #undef __field_struct_ext
 135 #define __field_struct_ext(type, item, filter_type)
 136
 137 #undef __array
 138 #define __array(type, item, len)
 139
 140 #undef __dynamic_array
 141 #define __dynamic_array(type, item, len)        u32 item;
 142
 143 #undef __string
 144 #define __string(item, src) __dynamic_array(char, item, -1)
 145
 146 #undef __bitmask
 147 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 148
 149 #undef DECLARE_EVENT_CLASS
 150 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 151         struct ftrace_data_offsets_##call {                             \
 152                 tstruct;                                                \
 153         };
 154
 155 #undef DEFINE_EVENT
 156 #define DEFINE_EVENT(template, name, proto, args)
 157
 158 #undef DEFINE_EVENT_PRINT
 159 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 160         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 161
 162 #undef TRACE_EVENT_FLAGS
 163 #define TRACE_EVENT_FLAGS(event, flag)
 164
 165 #undef TRACE_EVENT_PERF_PERM
 166 #define TRACE_EVENT_PERF_PERM(event, expr...)
 167
 168 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 169
 170 /*
 171  * Stage 3 of the trace events.
 172  *
 173  * Override the macros in <trace/trace_events.h> to include the following:
 174  *
 175  * enum print_line_t
 176  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 177  * {
 178  *      struct trace_seq *s = &iter->seq;
 179  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 180  *      struct trace_entry *entry;
 181  *      struct trace_seq *p = &iter->tmp_seq;
 182  *      int ret;
 183  *
 184  *      entry = iter->ent;
 185  *
 186  *      if (entry->type != event_<call>->event.type) {
 187  *              WARN_ON_ONCE(1);
 188  *              return TRACE_TYPE_UNHANDLED;
 189  *      }
 190  *
 191  *      field = (typeof(field))entry;
 192  *
 193  *      trace_seq_init(p);
 194  *      ret = trace_seq_printf(s, "%s: ", <call>);
 195  *      if (ret)
 196  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 197  *      if (!ret)
 198  *              return TRACE_TYPE_PARTIAL_LINE;
 199  *
 200  *      return TRACE_TYPE_HANDLED;
 201  * }
 202  *
 203  * This is the method used to print the raw event to the trace
 204  * output format. Note, this is not needed if the data is read
 205  * in binary.
 206  */
 207
 208 #undef __entry
 209 #define __entry field
 210
 211 #undef TP_printk
 212 #define TP_printk(fmt, args...) fmt "\n", args
 213
 214 #undef __get_dynamic_array
 215 #define __get_dynamic_array(field)      \
 216                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 217
 218 #undef __get_dynamic_array_len
 219 #define __get_dynamic_array_len(field)  \
 220                 ((__entry->__data_loc_##field >> 16) & 0xffff)
 221
 222 #undef __get_str
 223 #define __get_str(field) (char *)__get_dynamic_array(field)
 224
 225 #undef __get_bitmask
 226 #define __get_bitmask(field)                                            \
 227         ({                                                              \
 228                 void *__bitmask = __get_dynamic_array(field);           \
 229                 unsigned int __bitmask_size;                            \
 230                 __bitmask_size = __get_dynamic_array_len(field);        \
 231                 ftrace_print_bitmask_seq(p, __bitmask, __bitmask_size); \
 232         })
 233
 234 #undef __print_flags
 235 #define __print_flags(flag, delim, flag_array...)                       \
 236         ({                                                              \
 237                 static const struct trace_print_flags __flags[] =       \
 238                         { flag_array, { -1, NULL }};                    \
 239                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 240         })
 241
 242 #undef __print_symbolic
 243 #define __print_symbolic(value, symbol_array...)                        \
 244         ({                                                              \
 245                 static const struct trace_print_flags symbols[] =       \
 246                         { symbol_array, { -1, NULL }};                  \
 247                 ftrace_print_symbols_seq(p, value, symbols);            \
 248         })
 249
 250 #undef __print_symbolic_u64
 251 #if BITS_PER_LONG == 32
 252 #define __print_symbolic_u64(value, symbol_array...)                    \
 253         ({                                                              \
 254                 static const struct trace_print_flags_u64 symbols[] =   \
 255                         { symbol_array, { -1, NULL } };                 \
 256                 ftrace_print_symbols_seq_u64(p, value, symbols);        \
 257         })
 258 #else
 259 #define __print_symbolic_u64(value, symbol_array...)                    \
 260                         __print_symbolic(value, symbol_array)
 261 #endif
 262
 263 #undef __print_hex
 264 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
 265
 266 #undef DECLARE_EVENT_CLASS
 267 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 268 static notrace enum print_line_t                                        \
 269 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 270                          struct trace_event *trace_event)               \
 271 {                                                                       \
 272         struct trace_seq *s = &iter->seq;                               \
 273         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
 274         struct ftrace_raw_##call *field;                                \
 275         int ret;                                                        \
 276                                                                         \
 277         field = (typeof(field))iter->ent;                               \
 278                                                                         \
 279         ret = ftrace_raw_output_prep(iter, trace_event);                \
 280         if (ret)                                                        \
 281                 return ret;                                             \
 282                                                                         \
 283         ret = trace_seq_printf(s, print);                               \
 284         if (!ret)                                                       \
 285                 return TRACE_TYPE_PARTIAL_LINE;                         \
 286                                                                         \
 287         return TRACE_TYPE_HANDLED;                                      \
 288 }                                                                       \
 289 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 290         .trace                  = ftrace_raw_output_##call,             \
 291 };
 292
 293 #undef DEFINE_EVENT_PRINT
 294 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 295 static notrace enum print_line_t                                        \
 296 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 297                          struct trace_event *event)                     \
 298 {                                                                       \
 299         struct ftrace_raw_##template *field;                            \
 300         struct trace_entry *entry;                                      \
 301         struct trace_seq *p = &iter->tmp_seq;                           \
 302                                                                         \
 303         entry = iter->ent;                                              \
 304                                                                         \
 305         if (entry->type != event_##call.event.type) {                   \
 306                 WARN_ON_ONCE(1);                                        \
 307                 return TRACE_TYPE_UNHANDLED;                            \
 308         }                                                               \
 309                                                                         \
 310         field = (typeof(field))entry;                                   \
 311                                                                         \
 312         trace_seq_init(p);                                              \
 313         return ftrace_output_call(iter, #call, print);                  \
 314 }                                                                       \
 315 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 316         .trace                  = ftrace_raw_output_##call,             \
 317 };
 318
 319 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 320
 321 #undef __field_ext
 322 #define __field_ext(type, item, filter_type)                            \
 323         ret = trace_define_field(event_call, #type, #item,              \
 324                                  offsetof(typeof(field), item),         \
 325                                  sizeof(field.item),                    \
 326                                  is_signed_type(type), filter_type);    \
 327         if (ret)                                                        \
 328                 return ret;
 329
 330 #undef __field_struct_ext
 331 #define __field_struct_ext(type, item, filter_type)                     \
 332         ret = trace_define_field(event_call, #type, #item,              \
 333                                  offsetof(typeof(field), item),         \
 334                                  sizeof(field.item),                    \
 335                                  0, filter_type);                       \
 336         if (ret)                                                        \
 337                 return ret;
 338
 339 #undef __field
 340 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 341
 342 #undef __field_struct
 343 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
 344
 345 #undef __array
 346 #define __array(type, item, len)                                        \
 347         do {                                                            \
 348                 char *type_str = #type"["__stringify(len)"]";           \
 349                 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
 350                 ret = trace_define_field(event_call, type_str, #item,   \
 351                                  offsetof(typeof(field), item),         \
 352                                  sizeof(field.item),                    \
 353                                  is_signed_type(type), FILTER_OTHER);   \
 354                 if (ret)                                                \
 355                         return ret;                                     \
 356         } while (0);
 357
 358 #undef __dynamic_array
 359 #define __dynamic_array(type, item, len)                                       \
 360         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 361                                  offsetof(typeof(field), __data_loc_##item),   \
 362                                  sizeof(field.__data_loc_##item),              \
 363                                  is_signed_type(type), FILTER_OTHER);
 364
 365 #undef __string
 366 #define __string(item, src) __dynamic_array(char, item, -1)
 367
 368 #undef __bitmask
 369 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 370
 371 #undef DECLARE_EVENT_CLASS
 372 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 373 static int notrace __init                                               \
 374 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 375 {                                                                       \
 376         struct ftrace_raw_##call field;                                 \
 377         int ret;                                                        \
 378                                                                         \
 379         tstruct;                                                        \
 380                                                                         \
 381         return ret;                                                     \
 382 }
 383
 384 #undef DEFINE_EVENT
 385 #define DEFINE_EVENT(template, name, proto, args)
 386
 387 #undef DEFINE_EVENT_PRINT
 388 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 389         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 390
 391 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 392
 393 /*
 394  * remember the offset of each array from the beginning of the event.
 395  */
 396
 397 #undef __entry
 398 #define __entry entry
 399
 400 #undef __field
 401 #define __field(type, item)
 402
 403 #undef __field_ext
 404 #define __field_ext(type, item, filter_type)
 405
 406 #undef __field_struct
 407 #define __field_struct(type, item)
 408
 409 #undef __field_struct_ext
 410 #define __field_struct_ext(type, item, filter_type)
 411
 412 #undef __array
 413 #define __array(type, item, len)
 414
 415 #undef __dynamic_array
 416 #define __dynamic_array(type, item, len)                                \
 417         __item_length = (len) * sizeof(type);                           \
 418         __data_offsets->item = __data_size +                            \
 419                                offsetof(typeof(*entry), __data);        \
 420         __data_offsets->item |= __item_length << 16;                    \
 421         __data_size += __item_length;
 422
 423 #undef __string
 424 #define __string(item, src) __dynamic_array(char, item,                 \
 425                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 426
 427 /*
 428  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
 429  * num_possible_cpus().
 430  */
 431 #define __bitmask_size_in_bytes_raw(nr_bits)    \
 432         (((nr_bits) + 7) / 8)
 433
 434 #define __bitmask_size_in_longs(nr_bits)                        \
 435         ((__bitmask_size_in_bytes_raw(nr_bits) +                \
 436           ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
 437
 438 /*
 439  * __bitmask_size_in_bytes is the number of bytes needed to hold
 440  * num_possible_cpus() padded out to the nearest long. This is what
 441  * is saved in the buffer, just to be consistent.
 442  */
 443 #define __bitmask_size_in_bytes(nr_bits)                                \
 444         (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
 445
 446 #undef __bitmask
 447 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,   \
 448                                          __bitmask_size_in_longs(nr_bits))
 449
 450 #undef DECLARE_EVENT_CLASS
 451 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 452 static inline notrace int ftrace_get_offsets_##call(                    \
 453         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 454 {                                                                       \
 455         int __data_size = 0;                                            \
 456         int __maybe_unused __item_length;                               \
 457         struct ftrace_raw_##call __maybe_unused *entry;                 \
 458                                                                         \
 459         tstruct;                                                        \
 460                                                                         \
 461         return __data_size;                                             \
 462 }
 463
 464 #undef DEFINE_EVENT
 465 #define DEFINE_EVENT(template, name, proto, args)
 466
 467 #undef DEFINE_EVENT_PRINT
 468 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 469         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 470
 471 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 472
 473 /*
 474  * Stage 4 of the trace events.
 475  *
 476  * Override the macros in <trace/trace_events.h> to include the following:
 477  *
 478  * For those macros defined with TRACE_EVENT:
 479  *
 480  * static struct ftrace_event_call event_<call>;
 481  *
 482  * static void ftrace_raw_event_<call>(void *__data, proto)
 483  * {
 484  *      struct ftrace_event_file *ftrace_file = __data;
 485  *      struct ftrace_event_call *event_call = ftrace_file->event_call;
 486  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 487  *      unsigned long eflags = ftrace_file->flags;
 488  *      enum event_trigger_type __tt = ETT_NONE;
 489  *      struct ring_buffer_event *event;
 490  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 491  *      struct ring_buffer *buffer;
 492  *      unsigned long irq_flags;
 493  *      int __data_size;
 494  *      int pc;
 495  *
 496  *      if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
 497  *              if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
 498  *                      event_triggers_call(ftrace_file, NULL);
 499  *              if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
 500  *                      return;
 501  *      }
 502  *
 503  *      local_save_flags(irq_flags);
 504  *      pc = preempt_count();
 505  *
 506  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 507  *
 508  *      event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
 509  *                                event_<call>->event.type,
 510  *                                sizeof(*entry) + __data_size,
 511  *                                irq_flags, pc);
 512  *      if (!event)
 513  *              return;
 514  *      entry   = ring_buffer_event_data(event);
 515  *
 516  *      { <assign>; }  <-- Here we assign the entries by the __field and
 517  *                         __array macros.
 518  *
 519  *      if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
 520  *              __tt = event_triggers_call(ftrace_file, entry);
 521  *
 522  *      if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
 523  *                   &ftrace_file->flags))
 524  *              ring_buffer_discard_commit(buffer, event);
 525  *      else if (!filter_check_discard(ftrace_file, entry, buffer, event))
 526  *              trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
 527  *
 528  *      if (__tt)
 529  *              event_triggers_post_call(ftrace_file, __tt);
 530  * }
 531  *
 532  * static struct trace_event ftrace_event_type_<call> = {
 533  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 534  * };
 535  *
 536  * static const char print_fmt_<call>[] = <TP_printk>;
 537  *
 538  * static struct ftrace_event_class __used event_class_<template> = {
 539  *      .system                 = "<system>",
 540  *      .define_fields          = ftrace_define_fields_<call>,
 541  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 542  *      .raw_init               = trace_event_raw_init,
 543  *      .probe                  = ftrace_raw_event_##call,
 544  *      .reg                    = ftrace_event_reg,
 545  * };
 546  *
 547  * static struct ftrace_event_call event_<call> = {
 548  *      .class                  = event_class_<template>,
 549  *      {
 550  *              .tp                     = &__tracepoint_<call>,
 551  *      },
 552  *      .event                  = &ftrace_event_type_<call>,
 553  *      .print_fmt              = print_fmt_<call>,
 554  *      .flags                  = TRACE_EVENT_FL_TRACEPOINT,
 555  * };
 556  * // its only safe to use pointers when doing linker tricks to
 557  * // create an array.
 558  * static struct ftrace_event_call __used
 559  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 560  *
 561  */
 562
 563 #ifdef CONFIG_PERF_EVENTS
 564
 565 #define _TRACE_PERF_PROTO(call, proto)                                  \
 566         static notrace void                                             \
 567         perf_trace_##call(void *__data, proto);
 568
 569 #define _TRACE_PERF_INIT(call)                                          \
 570         .perf_probe             = perf_trace_##call,
 571
 572 #else
 573 #define _TRACE_PERF_PROTO(call, proto)
 574 #define _TRACE_PERF_INIT(call)
 575 #endif /* CONFIG_PERF_EVENTS */
 576
 577 #undef __entry
 578 #define __entry entry
 579
 580 #undef __field
 581 #define __field(type, item)
 582
 583 #undef __field_struct
 584 #define __field_struct(type, item)
 585
 586 #undef __array
 587 #define __array(type, item, len)
 588
 589 #undef __dynamic_array
 590 #define __dynamic_array(type, item, len)                                \
 591         __entry->__data_loc_##item = __data_offsets.item;
 592
 593 #undef __string
 594 #define __string(item, src) __dynamic_array(char, item, -1)
 595
 596 #undef __assign_str
 597 #define __assign_str(dst, src)                                          \
 598         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 599
 600 #undef __bitmask
 601 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
 602
 603 #undef __get_bitmask
 604 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 605
 606 #undef __assign_bitmask
 607 #define __assign_bitmask(dst, src, nr_bits)                                     \
 608         memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
 609
 610 #undef TP_fast_assign
 611 #define TP_fast_assign(args...) args
 612
 613 #undef __perf_addr
 614 #define __perf_addr(a)  (a)
 615
 616 #undef __perf_count
 617 #define __perf_count(c) (c)
 618
 619 #undef __perf_task
 620 #define __perf_task(t)  (t)
 621
 622 #undef DECLARE_EVENT_CLASS
 623 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 624                                                                         \
 625 static notrace void                                                     \
 626 ftrace_raw_event_##call(void *__data, proto)                            \
 627 {                                                                       \
 628         struct ftrace_event_file *ftrace_file = __data;                 \
 629         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 630         struct ftrace_event_buffer fbuffer;                             \
 631         struct ftrace_raw_##call *entry;                                \
 632         int __data_size;                                                \
 633                                                                         \
 634         if (ftrace_trigger_soft_disabled(ftrace_file))                  \
 635                 return;                                                 \
 636                                                                         \
 637         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 638                                                                         \
 639         entry = ftrace_event_buffer_reserve(&fbuffer, ftrace_file,      \
 640                                  sizeof(*entry) + __data_size);         \
 641                                                                         \
 642         if (!entry)                                                     \
 643                 return;                                                 \
 644                                                                         \
 645         tstruct                                                         \
 646                                                                         \
 647         { assign; }                                                     \
 648                                                                         \
 649         ftrace_event_buffer_commit(&fbuffer);                           \
 650 }
 651 /*
 652  * The ftrace_test_probe is compiled out, it is only here as a build time check
 653  * to make sure that if the tracepoint handling changes, the ftrace probe will
 654  * fail to compile unless it too is updated.
 655  */
 656
 657 #undef DEFINE_EVENT
 658 #define DEFINE_EVENT(template, call, proto, args)                       \
 659 static inline void ftrace_test_probe_##call(void)                       \
 660 {                                                                       \
 661         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
 662 }
 663
 664 #undef DEFINE_EVENT_PRINT
 665 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 666
 667 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 668
 669 #undef __entry
 670 #define __entry REC
 671
 672 #undef __print_flags
 673 #undef __print_symbolic
 674 #undef __print_hex
 675 #undef __get_dynamic_array
 676 #undef __get_dynamic_array_len
 677 #undef __get_str
 678 #undef __get_bitmask
 679
 680 #undef TP_printk
 681 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 682
 683 #undef DECLARE_EVENT_CLASS
 684 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 685 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 686 static const char print_fmt_##call[] = print;                           \
 687 static struct ftrace_event_class __used __refdata event_class_##call = { \
 688         .system                 = __stringify(TRACE_SYSTEM),            \
 689         .define_fields          = ftrace_define_fields_##call,          \
 690         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 691         .raw_init               = trace_event_raw_init,                 \
 692         .probe                  = ftrace_raw_event_##call,              \
 693         .reg                    = ftrace_event_reg,                     \
 694         _TRACE_PERF_INIT(call)                                          \
 695 };
 696
 697 #undef DEFINE_EVENT
 698 #define DEFINE_EVENT(template, call, proto, args)                       \
 699                                                                         \
 700 static struct ftrace_event_call __used event_##call = {                 \
 701         .class                  = &event_class_##template,              \
 702         {                                                               \
 703                 .tp                     = &__tracepoint_##call,         \
 704         },                                                              \
 705         .event.funcs            = &ftrace_event_type_funcs_##template,  \
 706         .print_fmt              = print_fmt_##template,                 \
 707         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 708 };                                                                      \
 709 static struct ftrace_event_call __used                                  \
 710 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 711
 712 #undef DEFINE_EVENT_PRINT
 713 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 714                                                                         \
 715 static const char print_fmt_##call[] = print;                           \
 716                                                                         \
 717 static struct ftrace_event_call __used event_##call = {                 \
 718         .class                  = &event_class_##template,              \
 719         {                                                               \
 720                 .tp                     = &__tracepoint_##call,         \
 721         },                                                              \
 722         .event.funcs            = &ftrace_event_type_funcs_##call,      \
 723         .print_fmt              = print_fmt_##call,                     \
 724         .flags                  = TRACE_EVENT_FL_TRACEPOINT,            \
 725 };                                                                      \
 726 static struct ftrace_event_call __used                                  \
 727 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 728
 729 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 730
 731
 732 #ifdef CONFIG_PERF_EVENTS
 733
 734 #undef __entry
 735 #define __entry entry
 736
 737 #undef __get_dynamic_array
 738 #define __get_dynamic_array(field)      \
 739                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 740
 741 #undef __get_dynamic_array_len
 742 #define __get_dynamic_array_len(field)  \
 743                 ((__entry->__data_loc_##field >> 16) & 0xffff)
 744
 745 #undef __get_str
 746 #define __get_str(field) (char *)__get_dynamic_array(field)
 747
 748 #undef __get_bitmask
 749 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
 750
 751 #undef __perf_addr
 752 #define __perf_addr(a)  (__addr = (a))
 753
 754 #undef __perf_count
 755 #define __perf_count(c) (__count = (c))
 756
 757 #undef __perf_task
 758 #define __perf_task(t)  (__task = (t))
 759
 760 #undef DECLARE_EVENT_CLASS
 761 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 762 static notrace void                                                     \
 763 perf_trace_##call(void *__data, proto)                                  \
 764 {                                                                       \
 765         struct ftrace_event_call *event_call = __data;                  \
 766         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 767         struct ftrace_raw_##call *entry;                                \
 768         struct pt_regs __regs;                                          \
 769         u64 __addr = 0, __count = 1;                                    \
 770         struct task_struct *__task = NULL;                              \
 771         struct hlist_head *head;                                        \
 772         int __entry_size;                                               \
 773         int __data_size;                                                \
 774         int rctx;                                                       \
 775                                                                         \
 776         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 777                                                                         \
 778         head = this_cpu_ptr(event_call->perf_events);                   \
 779         if (__builtin_constant_p(!__task) && !__task &&                 \
 780                                 hlist_empty(head))                      \
 781                 return;                                                 \
 782                                                                         \
 783         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 784                              sizeof(u64));                              \
 785         __entry_size -= sizeof(u32);                                    \
 786                                                                         \
 787         perf_fetch_caller_regs(&__regs);                                \
 788         entry = perf_trace_buf_prepare(__entry_size,                    \
 789                         event_call->event.type, &__regs, &rctx);        \
 790         if (!entry)                                                     \
 791                 return;                                                 \
 792                                                                         \
 793         tstruct                                                         \
 794                                                                         \
 795         { assign; }                                                     \
 796                                                                         \
 797         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 798                 __count, &__regs, head, __task);                        \
 799 }
 800
 801 /*
 802  * This part is compiled out, it is only here as a build time check
 803  * to make sure that if the tracepoint handling changes, the
 804  * perf probe will fail to compile unless it too is updated.
 805  */
 806 #undef DEFINE_EVENT
 807 #define DEFINE_EVENT(template, call, proto, args)                       \
 808 static inline void perf_test_probe_##call(void)                         \
 809 {                                                                       \
 810         check_trace_callback_type_##call(perf_trace_##template);        \
 811 }
 812
 813
 814 #undef DEFINE_EVENT_PRINT
 815 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 816         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 817
 818 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 819 #endif /* CONFIG_PERF_EVENTS */
 820