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 #undef DEFINE_EVENT
  67 #define DEFINE_EVENT(template, name, proto, args)       \
  68         static struct ftrace_event_call                 \
  69         __attribute__((__aligned__(4))) event_##name
  70
  71 #undef DEFINE_EVENT_PRINT
  72 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  73         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  74
  75 #undef __cpparg
  76 #define __cpparg(arg...) arg
  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, __cpparg(proto), __cpparg(args),              \
  83                 __cpparg(tstruct), __cpparg(assign), __cpparg(print))   \
  84
  85 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  86
  87
  88 /*
  89  * Stage 2 of the trace events.
  90  *
  91  * Include the following:
  92  *
  93  * struct ftrace_data_offsets_<call> {
  94  *      u32                             <item1>;
  95  *      u32                             <item2>;
  96  *      [...]
  97  * };
  98  *
  99  * The __dynamic_array() macro will create each u32 <item>, this is
 100  * to keep the offset of each array from the beginning of the event.
 101  * The size of an array is also encoded, in the higher 16 bits of <item>.
 102  */
 103
 104 #undef __field
 105 #define __field(type, item)
 106
 107 #undef __field_ext
 108 #define __field_ext(type, item, filter_type)
 109
 110 #undef __array
 111 #define __array(type, item, len)
 112
 113 #undef __dynamic_array
 114 #define __dynamic_array(type, item, len)        u32 item;
 115
 116 #undef __string
 117 #define __string(item, src) __dynamic_array(char, item, -1)
 118
 119 #undef DECLARE_EVENT_CLASS
 120 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 121         struct ftrace_data_offsets_##call {                             \
 122                 tstruct;                                                \
 123         };
 124
 125 #undef DEFINE_EVENT
 126 #define DEFINE_EVENT(template, name, proto, args)
 127
 128 #undef DEFINE_EVENT_PRINT
 129 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 130         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 131
 132 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 133
 134 /*
 135  * Stage 3 of the trace events.
 136  *
 137  * Override the macros in <trace/trace_events.h> to include the following:
 138  *
 139  * enum print_line_t
 140  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 141  * {
 142  *      struct trace_seq *s = &iter->seq;
 143  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 144  *      struct trace_entry *entry;
 145  *      struct trace_seq *p;
 146  *      int ret;
 147  *
 148  *      entry = iter->ent;
 149  *
 150  *      if (entry->type != event_<call>.id) {
 151  *              WARN_ON_ONCE(1);
 152  *              return TRACE_TYPE_UNHANDLED;
 153  *      }
 154  *
 155  *      field = (typeof(field))entry;
 156  *
 157  *      p = get_cpu_var(ftrace_event_seq);
 158  *      trace_seq_init(p);
 159  *      ret = trace_seq_printf(s, <TP_printk> "\n");
 160  *      put_cpu();
 161  *      if (!ret)
 162  *              return TRACE_TYPE_PARTIAL_LINE;
 163  *
 164  *      return TRACE_TYPE_HANDLED;
 165  * }
 166  *
 167  * This is the method used to print the raw event to the trace
 168  * output format. Note, this is not needed if the data is read
 169  * in binary.
 170  */
 171
 172 #undef __entry
 173 #define __entry field
 174
 175 #undef TP_printk
 176 #define TP_printk(fmt, args...) fmt "\n", args
 177
 178 #undef __get_dynamic_array
 179 #define __get_dynamic_array(field)      \
 180                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 181
 182 #undef __get_str
 183 #define __get_str(field) (char *)__get_dynamic_array(field)
 184
 185 #undef __print_flags
 186 #define __print_flags(flag, delim, flag_array...)                       \
 187         ({                                                              \
 188                 static const struct trace_print_flags __flags[] =       \
 189                         { flag_array, { -1, NULL }};                    \
 190                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 191         })
 192
 193 #undef __print_symbolic
 194 #define __print_symbolic(value, symbol_array...)                        \
 195         ({                                                              \
 196                 static const struct trace_print_flags symbols[] =       \
 197                         { symbol_array, { -1, NULL }};                  \
 198                 ftrace_print_symbols_seq(p, value, symbols);            \
 199         })
 200
 201 #undef DECLARE_EVENT_CLASS
 202 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 203 static notrace enum print_line_t                                        \
 204 ftrace_raw_output_id_##call(int event_id, const char *name,             \
 205                             struct trace_iterator *iter, int flags)     \
 206 {                                                                       \
 207         struct trace_seq *s = &iter->seq;                               \
 208         struct ftrace_raw_##call *field;                                \
 209         struct trace_entry *entry;                                      \
 210         struct trace_seq *p;                                            \
 211         int ret;                                                        \
 212                                                                         \
 213         entry = iter->ent;                                              \
 214                                                                         \
 215         if (entry->type != event_id) {                                  \
 216                 WARN_ON_ONCE(1);                                        \
 217                 return TRACE_TYPE_UNHANDLED;                            \
 218         }                                                               \
 219                                                                         \
 220         field = (typeof(field))entry;                                   \
 221                                                                         \
 222         p = &get_cpu_var(ftrace_event_seq);                             \
 223         trace_seq_init(p);                                              \
 224         ret = trace_seq_printf(s, "%s: ", name);                        \
 225         if (ret)                                                        \
 226                 ret = trace_seq_printf(s, print);                       \
 227         put_cpu();                                                      \
 228         if (!ret)                                                       \
 229                 return TRACE_TYPE_PARTIAL_LINE;                         \
 230                                                                         \
 231         return TRACE_TYPE_HANDLED;                                      \
 232 }
 233
 234 #undef DEFINE_EVENT
 235 #define DEFINE_EVENT(template, name, proto, args)                       \
 236 static notrace enum print_line_t                                        \
 237 ftrace_raw_output_##name(struct trace_iterator *iter, int flags)        \
 238 {                                                                       \
 239         return ftrace_raw_output_id_##template(event_##name.id,         \
 240                                                #name, iter, flags);     \
 241 }
 242
 243 #undef DEFINE_EVENT_PRINT
 244 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 245 static notrace enum print_line_t                                        \
 246 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
 247 {                                                                       \
 248         struct trace_seq *s = &iter->seq;                               \
 249         struct ftrace_raw_##template *field;                            \
 250         struct trace_entry *entry;                                      \
 251         struct trace_seq *p;                                            \
 252         int ret;                                                        \
 253                                                                         \
 254         entry = iter->ent;                                              \
 255                                                                         \
 256         if (entry->type != event_##call.id) {                           \
 257                 WARN_ON_ONCE(1);                                        \
 258                 return TRACE_TYPE_UNHANDLED;                            \
 259         }                                                               \
 260                                                                         \
 261         field = (typeof(field))entry;                                   \
 262                                                                         \
 263         p = &get_cpu_var(ftrace_event_seq);                             \
 264         trace_seq_init(p);                                              \
 265         ret = trace_seq_printf(s, "%s: ", #call);                       \
 266         if (ret)                                                        \
 267                 ret = trace_seq_printf(s, print);                       \
 268         put_cpu();                                                      \
 269         if (!ret)                                                       \
 270                 return TRACE_TYPE_PARTIAL_LINE;                         \
 271                                                                         \
 272         return TRACE_TYPE_HANDLED;                                      \
 273 }
 274
 275 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 276
 277 #undef __field_ext
 278 #define __field_ext(type, item, filter_type)                            \
 279         ret = trace_define_field(event_call, #type, #item,              \
 280                                  offsetof(typeof(field), item),         \
 281                                  sizeof(field.item),                    \
 282                                  is_signed_type(type), filter_type);    \
 283         if (ret)                                                        \
 284                 return ret;
 285
 286 #undef __field
 287 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 288
 289 #undef __array
 290 #define __array(type, item, len)                                        \
 291         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 292         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 293                                  offsetof(typeof(field), item),         \
 294                                  sizeof(field.item),                    \
 295                                  is_signed_type(type), FILTER_OTHER);   \
 296         if (ret)                                                        \
 297                 return ret;
 298
 299 #undef __dynamic_array
 300 #define __dynamic_array(type, item, len)                                       \
 301         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 302                                  offsetof(typeof(field), __data_loc_##item),   \
 303                                  sizeof(field.__data_loc_##item),              \
 304                                  is_signed_type(type), FILTER_OTHER);
 305
 306 #undef __string
 307 #define __string(item, src) __dynamic_array(char, item, -1)
 308
 309 #undef DECLARE_EVENT_CLASS
 310 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 311 static int notrace                                                      \
 312 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 313 {                                                                       \
 314         struct ftrace_raw_##call field;                                 \
 315         int ret;                                                        \
 316                                                                         \
 317         tstruct;                                                        \
 318                                                                         \
 319         return ret;                                                     \
 320 }
 321
 322 #undef DEFINE_EVENT
 323 #define DEFINE_EVENT(template, name, proto, args)
 324
 325 #undef DEFINE_EVENT_PRINT
 326 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 327         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 328
 329 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 330
 331 /*
 332  * remember the offset of each array from the beginning of the event.
 333  */
 334
 335 #undef __entry
 336 #define __entry entry
 337
 338 #undef __field
 339 #define __field(type, item)
 340
 341 #undef __field_ext
 342 #define __field_ext(type, item, filter_type)
 343
 344 #undef __array
 345 #define __array(type, item, len)
 346
 347 #undef __dynamic_array
 348 #define __dynamic_array(type, item, len)                                \
 349         __data_offsets->item = __data_size +                            \
 350                                offsetof(typeof(*entry), __data);        \
 351         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 352         __data_size += (len) * sizeof(type);
 353
 354 #undef __string
 355 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
 356
 357 #undef DECLARE_EVENT_CLASS
 358 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 359 static inline notrace int ftrace_get_offsets_##call(                    \
 360         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 361 {                                                                       \
 362         int __data_size = 0;                                            \
 363         struct ftrace_raw_##call __maybe_unused *entry;                 \
 364                                                                         \
 365         tstruct;                                                        \
 366                                                                         \
 367         return __data_size;                                             \
 368 }
 369
 370 #undef DEFINE_EVENT
 371 #define DEFINE_EVENT(template, name, proto, args)
 372
 373 #undef DEFINE_EVENT_PRINT
 374 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 375         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 376
 377 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 378
 379 #ifdef CONFIG_PERF_EVENTS
 380
 381 /*
 382  * Generate the functions needed for tracepoint perf_event support.
 383  *
 384  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
 385  *
 386  * static int ftrace_profile_enable_<call>(void)
 387  * {
 388  *      return register_trace_<call>(ftrace_profile_<call>);
 389  * }
 390  *
 391  * static void ftrace_profile_disable_<call>(void)
 392  * {
 393  *      unregister_trace_<call>(ftrace_profile_<call>);
 394  * }
 395  *
 396  */
 397
 398 #undef DECLARE_EVENT_CLASS
 399 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
 400
 401 #undef DEFINE_EVENT
 402 #define DEFINE_EVENT(template, name, proto, args)                       \
 403                                                                         \
 404 static void perf_trace_##name(proto);                                   \
 405                                                                         \
 406 static notrace int                                                      \
 407 perf_trace_enable_##name(struct ftrace_event_call *unused)              \
 408 {                                                                       \
 409         return register_trace_##name(perf_trace_##name);                \
 410 }                                                                       \
 411                                                                         \
 412 static notrace void                                                     \
 413 perf_trace_disable_##name(struct ftrace_event_call *unused)             \
 414 {                                                                       \
 415         unregister_trace_##name(perf_trace_##name);                     \
 416 }
 417
 418 #undef DEFINE_EVENT_PRINT
 419 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 420         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 421
 422 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 423
 424 #endif /* CONFIG_PERF_EVENTS */
 425
 426 /*
 427  * Stage 4 of the trace events.
 428  *
 429  * Override the macros in <trace/trace_events.h> to include the following:
 430  *
 431  * static void ftrace_event_<call>(proto)
 432  * {
 433  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
 434  * }
 435  *
 436  * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
 437  * {
 438  *      return register_trace_<call>(ftrace_event_<call>);
 439  * }
 440  *
 441  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
 442  * {
 443  *      unregister_trace_<call>(ftrace_event_<call>);
 444  * }
 445  *
 446  *
 447  * For those macros defined with TRACE_EVENT:
 448  *
 449  * static struct ftrace_event_call event_<call>;
 450  *
 451  * static void ftrace_raw_event_<call>(proto)
 452  * {
 453  *      struct ring_buffer_event *event;
 454  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 455  *      struct ring_buffer *buffer;
 456  *      unsigned long irq_flags;
 457  *      int pc;
 458  *
 459  *      local_save_flags(irq_flags);
 460  *      pc = preempt_count();
 461  *
 462  *      event = trace_current_buffer_lock_reserve(&buffer,
 463  *                                event_<call>.id,
 464  *                                sizeof(struct ftrace_raw_<call>),
 465  *                                irq_flags, pc);
 466  *      if (!event)
 467  *              return;
 468  *      entry   = ring_buffer_event_data(event);
 469  *
 470  *      <assign>;  <-- Here we assign the entries by the __field and
 471  *                      __array macros.
 472  *
 473  *      trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
 474  * }
 475  *
 476  * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
 477  * {
 478  *      int ret;
 479  *
 480  *      ret = register_trace_<call>(ftrace_raw_event_<call>);
 481  *      if (!ret)
 482  *              pr_info("event trace: Could not activate trace point "
 483  *                      "probe to <call>");
 484  *      return ret;
 485  * }
 486  *
 487  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
 488  * {
 489  *      unregister_trace_<call>(ftrace_raw_event_<call>);
 490  * }
 491  *
 492  * static struct trace_event ftrace_event_type_<call> = {
 493  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 494  * };
 495  *
 496  * static struct ftrace_event_call __used
 497  * __attribute__((__aligned__(4)))
 498  * __attribute__((section("_ftrace_events"))) event_<call> = {
 499  *      .name                   = "<call>",
 500  *      .system                 = "<system>",
 501  *      .raw_init               = trace_event_raw_init,
 502  *      .regfunc                = ftrace_reg_event_<call>,
 503  *      .unregfunc              = ftrace_unreg_event_<call>,
 504  * }
 505  *
 506  */
 507
 508 #ifdef CONFIG_PERF_EVENTS
 509
 510 #define _TRACE_PERF_INIT(call)                                          \
 511         .perf_event_enable = perf_trace_enable_##call,                  \
 512         .perf_event_disable = perf_trace_disable_##call,
 513
 514 #else
 515 #define _TRACE_PERF_INIT(call)
 516 #endif /* CONFIG_PERF_EVENTS */
 517
 518 #undef __entry
 519 #define __entry entry
 520
 521 #undef __field
 522 #define __field(type, item)
 523
 524 #undef __array
 525 #define __array(type, item, len)
 526
 527 #undef __dynamic_array
 528 #define __dynamic_array(type, item, len)                                \
 529         __entry->__data_loc_##item = __data_offsets.item;
 530
 531 #undef __string
 532 #define __string(item, src) __dynamic_array(char, item, -1)             \
 533
 534 #undef __assign_str
 535 #define __assign_str(dst, src)                                          \
 536         strcpy(__get_str(dst), src);
 537
 538 #undef TP_fast_assign
 539 #define TP_fast_assign(args...) args
 540
 541 #undef TP_perf_assign
 542 #define TP_perf_assign(args...)
 543
 544 #undef DECLARE_EVENT_CLASS
 545 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 546                                                                         \
 547 static notrace void                                                     \
 548 ftrace_raw_event_id_##call(struct ftrace_event_call *event_call,        \
 549                                        proto)                           \
 550 {                                                                       \
 551         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 552         struct ring_buffer_event *event;                                \
 553         struct ftrace_raw_##call *entry;                                \
 554         struct ring_buffer *buffer;                                     \
 555         unsigned long irq_flags;                                        \
 556         int __data_size;                                                \
 557         int pc;                                                         \
 558                                                                         \
 559         local_save_flags(irq_flags);                                    \
 560         pc = preempt_count();                                           \
 561                                                                         \
 562         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 563                                                                         \
 564         event = trace_current_buffer_lock_reserve(&buffer,              \
 565                                  event_call->id,                        \
 566                                  sizeof(*entry) + __data_size,          \
 567                                  irq_flags, pc);                        \
 568         if (!event)                                                     \
 569                 return;                                                 \
 570         entry   = ring_buffer_event_data(event);                        \
 571                                                                         \
 572                                                                         \
 573         tstruct                                                         \
 574                                                                         \
 575         { assign; }                                                     \
 576                                                                         \
 577         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 578                 trace_nowake_buffer_unlock_commit(buffer,               \
 579                                                   event, irq_flags, pc); \
 580 }
 581
 582 #undef DEFINE_EVENT
 583 #define DEFINE_EVENT(template, call, proto, args)                       \
 584                                                                         \
 585 static notrace void ftrace_raw_event_##call(proto)                      \
 586 {                                                                       \
 587         ftrace_raw_event_id_##template(&event_##call, args);            \
 588 }                                                                       \
 589                                                                         \
 590 static notrace int                                                      \
 591 ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)           \
 592 {                                                                       \
 593         return register_trace_##call(ftrace_raw_event_##call);          \
 594 }                                                                       \
 595                                                                         \
 596 static notrace void                                                     \
 597 ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)         \
 598 {                                                                       \
 599         unregister_trace_##call(ftrace_raw_event_##call);               \
 600 }                                                                       \
 601                                                                         \
 602 static struct trace_event ftrace_event_type_##call = {                  \
 603         .trace                  = ftrace_raw_output_##call,             \
 604 };
 605
 606 #undef DEFINE_EVENT_PRINT
 607 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 608         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 609
 610 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 611
 612 #undef __entry
 613 #define __entry REC
 614
 615 #undef __print_flags
 616 #undef __print_symbolic
 617 #undef __get_dynamic_array
 618 #undef __get_str
 619
 620 #undef TP_printk
 621 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 622
 623 #undef DECLARE_EVENT_CLASS
 624 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 625 static const char print_fmt_##call[] = print;
 626
 627 #undef DEFINE_EVENT
 628 #define DEFINE_EVENT(template, call, proto, args)                       \
 629                                                                         \
 630 static struct ftrace_event_call __used                                  \
 631 __attribute__((__aligned__(4)))                                         \
 632 __attribute__((section("_ftrace_events"))) event_##call = {             \
 633         .name                   = #call,                                \
 634         .system                 = __stringify(TRACE_SYSTEM),            \
 635         .event                  = &ftrace_event_type_##call,            \
 636         .raw_init               = trace_event_raw_init,                 \
 637         .regfunc                = ftrace_raw_reg_event_##call,          \
 638         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 639         .print_fmt              = print_fmt_##template,                 \
 640         .define_fields          = ftrace_define_fields_##template,      \
 641         _TRACE_PERF_INIT(call)                                  \
 642 }
 643
 644 #undef DEFINE_EVENT_PRINT
 645 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 646                                                                         \
 647 static const char print_fmt_##call[] = print;                           \
 648                                                                         \
 649 static struct ftrace_event_call __used                                  \
 650 __attribute__((__aligned__(4)))                                         \
 651 __attribute__((section("_ftrace_events"))) event_##call = {             \
 652         .name                   = #call,                                \
 653         .system                 = __stringify(TRACE_SYSTEM),            \
 654         .event                  = &ftrace_event_type_##call,            \
 655         .raw_init               = trace_event_raw_init,                 \
 656         .regfunc                = ftrace_raw_reg_event_##call,          \
 657         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 658         .print_fmt              = print_fmt_##call,                     \
 659         .define_fields          = ftrace_define_fields_##template,      \
 660         _TRACE_PERF_INIT(call)                                  \
 661 }
 662
 663 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 664
 665 /*
 666  * Define the insertion callback to perf events
 667  *
 668  * The job is very similar to ftrace_raw_event_<call> except that we don't
 669  * insert in the ring buffer but in a perf counter.
 670  *
 671  * static void ftrace_perf_<call>(proto)
 672  * {
 673  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 674  *      struct ftrace_event_call *event_call = &event_<call>;
 675  *      extern void perf_tp_event(int, u64, u64, void *, int);
 676  *      struct ftrace_raw_##call *entry;
 677  *      struct perf_trace_buf *trace_buf;
 678  *      u64 __addr = 0, __count = 1;
 679  *      unsigned long irq_flags;
 680  *      struct trace_entry *ent;
 681  *      int __entry_size;
 682  *      int __data_size;
 683  *      int __cpu
 684  *      int pc;
 685  *
 686  *      pc = preempt_count();
 687  *
 688  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 689  *
 690  *      // Below we want to get the aligned size by taking into account
 691  *      // the u32 field that will later store the buffer size
 692  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 693  *                           sizeof(u64));
 694  *      __entry_size -= sizeof(u32);
 695  *
 696  *      // Protect the non nmi buffer
 697  *      // This also protects the rcu read side
 698  *      local_irq_save(irq_flags);
 699  *      __cpu = smp_processor_id();
 700  *
 701  *      if (in_nmi())
 702  *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
 703  *      else
 704  *              trace_buf = rcu_dereference_sched(perf_trace_buf);
 705  *
 706  *      if (!trace_buf)
 707  *              goto end;
 708  *
 709  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
 710  *
 711  *      // Avoid recursion from perf that could mess up the buffer
 712  *      if (trace_buf->recursion++)
 713  *              goto end_recursion;
 714  *
 715  *      raw_data = trace_buf->buf;
 716  *
 717  *      // Make recursion update visible before entering perf_tp_event
 718  *      // so that we protect from perf recursions.
 719  *
 720  *      barrier();
 721  *
 722  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 723  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 724  *      entry = (struct ftrace_raw_<call> *)raw_data;
 725  *      ent = &entry->ent;
 726  *      tracing_generic_entry_update(ent, irq_flags, pc);
 727  *      ent->type = event_call->id;
 728  *
 729  *      <tstruct> <- do some jobs with dynamic arrays
 730  *
 731  *      <assign>  <- affect our values
 732  *
 733  *      perf_tp_event(event_call->id, __addr, __count, entry,
 734  *                   __entry_size);  <- submit them to perf counter
 735  *
 736  * }
 737  */
 738
 739 #ifdef CONFIG_PERF_EVENTS
 740
 741 #undef __entry
 742 #define __entry entry
 743
 744 #undef __get_dynamic_array
 745 #define __get_dynamic_array(field)      \
 746                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 747
 748 #undef __get_str
 749 #define __get_str(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 DECLARE_EVENT_CLASS
 758 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 759 static notrace void                                                     \
 760 perf_trace_templ_##call(struct ftrace_event_call *event_call,           \
 761                             proto)                                      \
 762 {                                                                       \
 763         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 764         struct ftrace_raw_##call *entry;                                \
 765         u64 __addr = 0, __count = 1;                                    \
 766         unsigned long irq_flags;                                        \
 767         struct pt_regs *__regs;                                         \
 768         int __entry_size;                                               \
 769         int __data_size;                                                \
 770         int rctx;                                                       \
 771                                                                         \
 772         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 773         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 774                              sizeof(u64));                              \
 775         __entry_size -= sizeof(u32);                                    \
 776                                                                         \
 777         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
 778                       "profile buffer not large enough"))               \
 779                 return;                                                 \
 780         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
 781                 __entry_size, event_call->id, &rctx, &irq_flags);       \
 782         if (!entry)                                                     \
 783                 return;                                                 \
 784         tstruct                                                         \
 785                                                                         \
 786         { assign; }                                                     \
 787                                                                         \
 788         __regs = &__get_cpu_var(perf_trace_regs);                       \
 789         perf_fetch_caller_regs(__regs, 2);                              \
 790                                                                         \
 791         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 792                                __count, irq_flags, __regs);             \
 793 }
 794
 795 #undef DEFINE_EVENT
 796 #define DEFINE_EVENT(template, call, proto, args)               \
 797 static notrace void perf_trace_##call(proto)                    \
 798 {                                                               \
 799         struct ftrace_event_call *event_call = &event_##call;   \
 800                                                                 \
 801         perf_trace_templ_##template(event_call, args);          \
 802 }
 803
 804 #undef DEFINE_EVENT_PRINT
 805 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 806         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 807
 808 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 809 #endif /* CONFIG_PERF_EVENTS */
 810
 811 #undef _TRACE_PROFILE_INIT
 812