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 event_##name
  69
  70 #undef DEFINE_EVENT_PRINT
  71 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  72         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  73
  74 #undef __cpparg
  75 #define __cpparg(arg...) arg
  76
  77 /* Callbacks are meaningless to ftrace. */
  78 #undef TRACE_EVENT_FN
  79 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  80                 assign, print, reg, unreg)                              \
  81         TRACE_EVENT(name, __cpparg(proto), __cpparg(args),              \
  82                 __cpparg(tstruct), __cpparg(assign), __cpparg(print))   \
  83
  84 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  85
  86
  87 /*
  88  * Stage 2 of the trace events.
  89  *
  90  * Include the following:
  91  *
  92  * struct ftrace_data_offsets_<call> {
  93  *      u32                             <item1>;
  94  *      u32                             <item2>;
  95  *      [...]
  96  * };
  97  *
  98  * The __dynamic_array() macro will create each u32 <item>, this is
  99  * to keep the offset of each array from the beginning of the event.
 100  * The size of an array is also encoded, in the higher 16 bits of <item>.
 101  */
 102
 103 #undef __field
 104 #define __field(type, item)
 105
 106 #undef __field_ext
 107 #define __field_ext(type, item, filter_type)
 108
 109 #undef __array
 110 #define __array(type, item, len)
 111
 112 #undef __dynamic_array
 113 #define __dynamic_array(type, item, len)        u32 item;
 114
 115 #undef __string
 116 #define __string(item, src) __dynamic_array(char, item, -1)
 117
 118 #undef DECLARE_EVENT_CLASS
 119 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 120         struct ftrace_data_offsets_##call {                             \
 121                 tstruct;                                                \
 122         };
 123
 124 #undef DEFINE_EVENT
 125 #define DEFINE_EVENT(template, name, proto, args)
 126
 127 #undef DEFINE_EVENT_PRINT
 128 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 129         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 130
 131 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 132
 133 /*
 134  * Stage 3 of the trace events.
 135  *
 136  * Override the macros in <trace/trace_events.h> to include the following:
 137  *
 138  * enum print_line_t
 139  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 140  * {
 141  *      struct trace_seq *s = &iter->seq;
 142  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 143  *      struct trace_entry *entry;
 144  *      struct trace_seq *p;
 145  *      int ret;
 146  *
 147  *      entry = iter->ent;
 148  *
 149  *      if (entry->type != event_<call>.id) {
 150  *              WARN_ON_ONCE(1);
 151  *              return TRACE_TYPE_UNHANDLED;
 152  *      }
 153  *
 154  *      field = (typeof(field))entry;
 155  *
 156  *      p = get_cpu_var(ftrace_event_seq);
 157  *      trace_seq_init(p);
 158  *      ret = trace_seq_printf(s, <TP_printk> "\n");
 159  *      put_cpu();
 160  *      if (!ret)
 161  *              return TRACE_TYPE_PARTIAL_LINE;
 162  *
 163  *      return TRACE_TYPE_HANDLED;
 164  * }
 165  *
 166  * This is the method used to print the raw event to the trace
 167  * output format. Note, this is not needed if the data is read
 168  * in binary.
 169  */
 170
 171 #undef __entry
 172 #define __entry field
 173
 174 #undef TP_printk
 175 #define TP_printk(fmt, args...) fmt "\n", args
 176
 177 #undef __get_dynamic_array
 178 #define __get_dynamic_array(field)      \
 179                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 180
 181 #undef __get_str
 182 #define __get_str(field) (char *)__get_dynamic_array(field)
 183
 184 #undef __print_flags
 185 #define __print_flags(flag, delim, flag_array...)                       \
 186         ({                                                              \
 187                 static const struct trace_print_flags __flags[] =       \
 188                         { flag_array, { -1, NULL }};                    \
 189                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 190         })
 191
 192 #undef __print_symbolic
 193 #define __print_symbolic(value, symbol_array...)                        \
 194         ({                                                              \
 195                 static const struct trace_print_flags symbols[] =       \
 196                         { symbol_array, { -1, NULL }};                  \
 197                 ftrace_print_symbols_seq(p, value, symbols);            \
 198         })
 199
 200 #undef DECLARE_EVENT_CLASS
 201 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 202 static notrace enum print_line_t                                        \
 203 ftrace_raw_output_id_##call(int event_id, const char *name,             \
 204                             struct trace_iterator *iter, int flags)     \
 205 {                                                                       \
 206         struct trace_seq *s = &iter->seq;                               \
 207         struct ftrace_raw_##call *field;                                \
 208         struct trace_entry *entry;                                      \
 209         struct trace_seq *p;                                            \
 210         int ret;                                                        \
 211                                                                         \
 212         entry = iter->ent;                                              \
 213                                                                         \
 214         if (entry->type != event_id) {                                  \
 215                 WARN_ON_ONCE(1);                                        \
 216                 return TRACE_TYPE_UNHANDLED;                            \
 217         }                                                               \
 218                                                                         \
 219         field = (typeof(field))entry;                                   \
 220                                                                         \
 221         p = &get_cpu_var(ftrace_event_seq);                             \
 222         trace_seq_init(p);                                              \
 223         ret = trace_seq_printf(s, "%s: ", name);                        \
 224         if (ret)                                                        \
 225                 ret = trace_seq_printf(s, print);                       \
 226         put_cpu();                                                      \
 227         if (!ret)                                                       \
 228                 return TRACE_TYPE_PARTIAL_LINE;                         \
 229                                                                         \
 230         return TRACE_TYPE_HANDLED;                                      \
 231 }
 232
 233 #undef DEFINE_EVENT
 234 #define DEFINE_EVENT(template, name, proto, args)                       \
 235 static notrace enum print_line_t                                        \
 236 ftrace_raw_output_##name(struct trace_iterator *iter, int flags)        \
 237 {                                                                       \
 238         return ftrace_raw_output_id_##template(event_##name.id,         \
 239                                                #name, iter, flags);     \
 240 }
 241
 242 #undef DEFINE_EVENT_PRINT
 243 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 244 static notrace enum print_line_t                                        \
 245 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
 246 {                                                                       \
 247         struct trace_seq *s = &iter->seq;                               \
 248         struct ftrace_raw_##template *field;                            \
 249         struct trace_entry *entry;                                      \
 250         struct trace_seq *p;                                            \
 251         int ret;                                                        \
 252                                                                         \
 253         entry = iter->ent;                                              \
 254                                                                         \
 255         if (entry->type != event_##call.id) {                           \
 256                 WARN_ON_ONCE(1);                                        \
 257                 return TRACE_TYPE_UNHANDLED;                            \
 258         }                                                               \
 259                                                                         \
 260         field = (typeof(field))entry;                                   \
 261                                                                         \
 262         p = &get_cpu_var(ftrace_event_seq);                             \
 263         trace_seq_init(p);                                              \
 264         ret = trace_seq_printf(s, "%s: ", #call);                       \
 265         if (ret)                                                        \
 266                 ret = trace_seq_printf(s, print);                       \
 267         put_cpu();                                                      \
 268         if (!ret)                                                       \
 269                 return TRACE_TYPE_PARTIAL_LINE;                         \
 270                                                                         \
 271         return TRACE_TYPE_HANDLED;                                      \
 272 }
 273
 274 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 275
 276 #undef __field_ext
 277 #define __field_ext(type, item, filter_type)                            \
 278         ret = trace_define_field(event_call, #type, #item,              \
 279                                  offsetof(typeof(field), item),         \
 280                                  sizeof(field.item),                    \
 281                                  is_signed_type(type), filter_type);    \
 282         if (ret)                                                        \
 283                 return ret;
 284
 285 #undef __field
 286 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 287
 288 #undef __array
 289 #define __array(type, item, len)                                        \
 290         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 291         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 292                                  offsetof(typeof(field), item),         \
 293                                  sizeof(field.item),                    \
 294                                  is_signed_type(type), FILTER_OTHER);   \
 295         if (ret)                                                        \
 296                 return ret;
 297
 298 #undef __dynamic_array
 299 #define __dynamic_array(type, item, len)                                       \
 300         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 301                                  offsetof(typeof(field), __data_loc_##item),   \
 302                                  sizeof(field.__data_loc_##item),              \
 303                                  is_signed_type(type), FILTER_OTHER);
 304
 305 #undef __string
 306 #define __string(item, src) __dynamic_array(char, item, -1)
 307
 308 #undef DECLARE_EVENT_CLASS
 309 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 310 static int notrace                                                      \
 311 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 312 {                                                                       \
 313         struct ftrace_raw_##call field;                                 \
 314         int ret;                                                        \
 315                                                                         \
 316         tstruct;                                                        \
 317                                                                         \
 318         return ret;                                                     \
 319 }
 320
 321 #undef DEFINE_EVENT
 322 #define DEFINE_EVENT(template, name, proto, args)
 323
 324 #undef DEFINE_EVENT_PRINT
 325 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 326         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 327
 328 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 329
 330 /*
 331  * remember the offset of each array from the beginning of the event.
 332  */
 333
 334 #undef __entry
 335 #define __entry entry
 336
 337 #undef __field
 338 #define __field(type, item)
 339
 340 #undef __field_ext
 341 #define __field_ext(type, item, filter_type)
 342
 343 #undef __array
 344 #define __array(type, item, len)
 345
 346 #undef __dynamic_array
 347 #define __dynamic_array(type, item, len)                                \
 348         __data_offsets->item = __data_size +                            \
 349                                offsetof(typeof(*entry), __data);        \
 350         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 351         __data_size += (len) * sizeof(type);
 352
 353 #undef __string
 354 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
 355
 356 #undef DECLARE_EVENT_CLASS
 357 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 358 static inline notrace int ftrace_get_offsets_##call(                    \
 359         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 360 {                                                                       \
 361         int __data_size = 0;                                            \
 362         struct ftrace_raw_##call __maybe_unused *entry;                 \
 363                                                                         \
 364         tstruct;                                                        \
 365                                                                         \
 366         return __data_size;                                             \
 367 }
 368
 369 #undef DEFINE_EVENT
 370 #define DEFINE_EVENT(template, name, proto, args)
 371
 372 #undef DEFINE_EVENT_PRINT
 373 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 374         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 375
 376 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 377
 378 #ifdef CONFIG_EVENT_PROFILE
 379
 380 /*
 381  * Generate the functions needed for tracepoint perf_event support.
 382  *
 383  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
 384  *
 385  * static int ftrace_profile_enable_<call>(void)
 386  * {
 387  *      return register_trace_<call>(ftrace_profile_<call>);
 388  * }
 389  *
 390  * static void ftrace_profile_disable_<call>(void)
 391  * {
 392  *      unregister_trace_<call>(ftrace_profile_<call>);
 393  * }
 394  *
 395  */
 396
 397 #undef DECLARE_EVENT_CLASS
 398 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
 399
 400 #undef DEFINE_EVENT
 401 #define DEFINE_EVENT(template, name, proto, args)                       \
 402                                                                         \
 403 static void ftrace_profile_##name(proto);                               \
 404                                                                         \
 405 static notrace int                                                      \
 406 ftrace_profile_enable_##name(struct ftrace_event_call *unused)          \
 407 {                                                                       \
 408         return register_trace_##name(ftrace_profile_##name);            \
 409 }                                                                       \
 410                                                                         \
 411 static notrace void                                                     \
 412 ftrace_profile_disable_##name(struct ftrace_event_call *unused)         \
 413 {                                                                       \
 414         unregister_trace_##name(ftrace_profile_##name);                 \
 415 }
 416
 417 #undef DEFINE_EVENT_PRINT
 418 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 419         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 420
 421 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 422
 423 #endif
 424
 425 /*
 426  * Stage 4 of the trace events.
 427  *
 428  * Override the macros in <trace/trace_events.h> to include the following:
 429  *
 430  * static void ftrace_event_<call>(proto)
 431  * {
 432  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
 433  * }
 434  *
 435  * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
 436  * {
 437  *      return register_trace_<call>(ftrace_event_<call>);
 438  * }
 439  *
 440  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
 441  * {
 442  *      unregister_trace_<call>(ftrace_event_<call>);
 443  * }
 444  *
 445  *
 446  * For those macros defined with TRACE_EVENT:
 447  *
 448  * static struct ftrace_event_call event_<call>;
 449  *
 450  * static void ftrace_raw_event_<call>(proto)
 451  * {
 452  *      struct ring_buffer_event *event;
 453  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 454  *      struct ring_buffer *buffer;
 455  *      unsigned long irq_flags;
 456  *      int pc;
 457  *
 458  *      local_save_flags(irq_flags);
 459  *      pc = preempt_count();
 460  *
 461  *      event = trace_current_buffer_lock_reserve(&buffer,
 462  *                                event_<call>.id,
 463  *                                sizeof(struct ftrace_raw_<call>),
 464  *                                irq_flags, pc);
 465  *      if (!event)
 466  *              return;
 467  *      entry   = ring_buffer_event_data(event);
 468  *
 469  *      <assign>;  <-- Here we assign the entries by the __field and
 470  *                      __array macros.
 471  *
 472  *      trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
 473  * }
 474  *
 475  * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
 476  * {
 477  *      int ret;
 478  *
 479  *      ret = register_trace_<call>(ftrace_raw_event_<call>);
 480  *      if (!ret)
 481  *              pr_info("event trace: Could not activate trace point "
 482  *                      "probe to <call>");
 483  *      return ret;
 484  * }
 485  *
 486  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
 487  * {
 488  *      unregister_trace_<call>(ftrace_raw_event_<call>);
 489  * }
 490  *
 491  * static struct trace_event ftrace_event_type_<call> = {
 492  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 493  * };
 494  *
 495  * static struct ftrace_event_call __used
 496  * __attribute__((__aligned__(4)))
 497  * __attribute__((section("_ftrace_events"))) event_<call> = {
 498  *      .name                   = "<call>",
 499  *      .system                 = "<system>",
 500  *      .raw_init               = trace_event_raw_init,
 501  *      .regfunc                = ftrace_reg_event_<call>,
 502  *      .unregfunc              = ftrace_unreg_event_<call>,
 503  * }
 504  *
 505  */
 506
 507 #ifdef CONFIG_EVENT_PROFILE
 508
 509 #define _TRACE_PROFILE_INIT(call)                                       \
 510         .profile_enable = ftrace_profile_enable_##call,                 \
 511         .profile_disable = ftrace_profile_disable_##call,
 512
 513 #else
 514 #define _TRACE_PROFILE_INIT(call)
 515 #endif
 516
 517 #undef __entry
 518 #define __entry entry
 519
 520 #undef __field
 521 #define __field(type, item)
 522
 523 #undef __array
 524 #define __array(type, item, len)
 525
 526 #undef __dynamic_array
 527 #define __dynamic_array(type, item, len)                                \
 528         __entry->__data_loc_##item = __data_offsets.item;
 529
 530 #undef __string
 531 #define __string(item, src) __dynamic_array(char, item, -1)             \
 532
 533 #undef __assign_str
 534 #define __assign_str(dst, src)                                          \
 535         strcpy(__get_str(dst), src);
 536
 537 #undef TP_fast_assign
 538 #define TP_fast_assign(args...) args
 539
 540 #undef TP_perf_assign
 541 #define TP_perf_assign(args...)
 542
 543 #undef DECLARE_EVENT_CLASS
 544 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 545                                                                         \
 546 static notrace void                                                     \
 547 ftrace_raw_event_id_##call(struct ftrace_event_call *event_call,        \
 548                                        proto)                           \
 549 {                                                                       \
 550         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 551         struct ring_buffer_event *event;                                \
 552         struct ftrace_raw_##call *entry;                                \
 553         struct ring_buffer *buffer;                                     \
 554         unsigned long irq_flags;                                        \
 555         int __data_size;                                                \
 556         int pc;                                                         \
 557                                                                         \
 558         local_save_flags(irq_flags);                                    \
 559         pc = preempt_count();                                           \
 560                                                                         \
 561         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 562                                                                         \
 563         event = trace_current_buffer_lock_reserve(&buffer,              \
 564                                  event_call->id,                        \
 565                                  sizeof(*entry) + __data_size,          \
 566                                  irq_flags, pc);                        \
 567         if (!event)                                                     \
 568                 return;                                                 \
 569         entry   = ring_buffer_event_data(event);                        \
 570                                                                         \
 571                                                                         \
 572         tstruct                                                         \
 573                                                                         \
 574         { assign; }                                                     \
 575                                                                         \
 576         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 577                 trace_nowake_buffer_unlock_commit(buffer,               \
 578                                                   event, irq_flags, pc); \
 579 }
 580
 581 #undef DEFINE_EVENT
 582 #define DEFINE_EVENT(template, call, proto, args)                       \
 583                                                                         \
 584 static notrace void ftrace_raw_event_##call(proto)                      \
 585 {                                                                       \
 586         ftrace_raw_event_id_##template(&event_##call, args);            \
 587 }                                                                       \
 588                                                                         \
 589 static notrace int                                                      \
 590 ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)           \
 591 {                                                                       \
 592         return register_trace_##call(ftrace_raw_event_##call);          \
 593 }                                                                       \
 594                                                                         \
 595 static notrace void                                                     \
 596 ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)         \
 597 {                                                                       \
 598         unregister_trace_##call(ftrace_raw_event_##call);               \
 599 }                                                                       \
 600                                                                         \
 601 static struct trace_event ftrace_event_type_##call = {                  \
 602         .trace                  = ftrace_raw_output_##call,             \
 603 };
 604
 605 #undef DEFINE_EVENT_PRINT
 606 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 607         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 608
 609 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 610
 611 #undef __entry
 612 #define __entry REC
 613
 614 #undef __print_flags
 615 #undef __print_symbolic
 616 #undef __get_dynamic_array
 617 #undef __get_str
 618
 619 #undef TP_printk
 620 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 621
 622 #undef DECLARE_EVENT_CLASS
 623 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 624 static const char print_fmt_##call[] = print;
 625
 626 #undef DEFINE_EVENT
 627 #define DEFINE_EVENT(template, call, proto, args)                       \
 628                                                                         \
 629 static struct ftrace_event_call __used                                  \
 630 __attribute__((__aligned__(4)))                                         \
 631 __attribute__((section("_ftrace_events"))) event_##call = {             \
 632         .name                   = #call,                                \
 633         .system                 = __stringify(TRACE_SYSTEM),            \
 634         .event                  = &ftrace_event_type_##call,            \
 635         .raw_init               = trace_event_raw_init,                 \
 636         .regfunc                = ftrace_raw_reg_event_##call,          \
 637         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 638         .print_fmt              = print_fmt_##template,                 \
 639         .define_fields          = ftrace_define_fields_##template,      \
 640         _TRACE_PROFILE_INIT(call)                                       \
 641 }
 642
 643 #undef DEFINE_EVENT_PRINT
 644 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 645                                                                         \
 646 static const char print_fmt_##call[] = print;                           \
 647                                                                         \
 648 static struct ftrace_event_call __used                                  \
 649 __attribute__((__aligned__(4)))                                         \
 650 __attribute__((section("_ftrace_events"))) event_##call = {             \
 651         .name                   = #call,                                \
 652         .system                 = __stringify(TRACE_SYSTEM),            \
 653         .event                  = &ftrace_event_type_##call,            \
 654         .raw_init               = trace_event_raw_init,                 \
 655         .regfunc                = ftrace_raw_reg_event_##call,          \
 656         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 657         .print_fmt              = print_fmt_##call,                     \
 658         .define_fields          = ftrace_define_fields_##template,      \
 659         _TRACE_PROFILE_INIT(call)                                       \
 660 }
 661
 662 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 663
 664 /*
 665  * Define the insertion callback to profile events
 666  *
 667  * The job is very similar to ftrace_raw_event_<call> except that we don't
 668  * insert in the ring buffer but in a perf counter.
 669  *
 670  * static void ftrace_profile_<call>(proto)
 671  * {
 672  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 673  *      struct ftrace_event_call *event_call = &event_<call>;
 674  *      extern void perf_tp_event(int, u64, u64, void *, int);
 675  *      struct ftrace_raw_##call *entry;
 676  *      struct perf_trace_buf *trace_buf;
 677  *      u64 __addr = 0, __count = 1;
 678  *      unsigned long irq_flags;
 679  *      struct trace_entry *ent;
 680  *      int __entry_size;
 681  *      int __data_size;
 682  *      int __cpu
 683  *      int pc;
 684  *
 685  *      pc = preempt_count();
 686  *
 687  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 688  *
 689  *      // Below we want to get the aligned size by taking into account
 690  *      // the u32 field that will later store the buffer size
 691  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 692  *                           sizeof(u64));
 693  *      __entry_size -= sizeof(u32);
 694  *
 695  *      // Protect the non nmi buffer
 696  *      // This also protects the rcu read side
 697  *      local_irq_save(irq_flags);
 698  *      __cpu = smp_processor_id();
 699  *
 700  *      if (in_nmi())
 701  *              trace_buf = rcu_dereference(perf_trace_buf_nmi);
 702  *      else
 703  *              trace_buf = rcu_dereference(perf_trace_buf);
 704  *
 705  *      if (!trace_buf)
 706  *              goto end;
 707  *
 708  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
 709  *
 710  *      // Avoid recursion from perf that could mess up the buffer
 711  *      if (trace_buf->recursion++)
 712  *              goto end_recursion;
 713  *
 714  *      raw_data = trace_buf->buf;
 715  *
 716  *      // Make recursion update visible before entering perf_tp_event
 717  *      // so that we protect from perf recursions.
 718  *
 719  *      barrier();
 720  *
 721  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 722  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 723  *      entry = (struct ftrace_raw_<call> *)raw_data;
 724  *      ent = &entry->ent;
 725  *      tracing_generic_entry_update(ent, irq_flags, pc);
 726  *      ent->type = event_call->id;
 727  *
 728  *      <tstruct> <- do some jobs with dynamic arrays
 729  *
 730  *      <assign>  <- affect our values
 731  *
 732  *      perf_tp_event(event_call->id, __addr, __count, entry,
 733  *                   __entry_size);  <- submit them to perf counter
 734  *
 735  * }
 736  */
 737
 738 #ifdef CONFIG_EVENT_PROFILE
 739
 740 #undef __entry
 741 #define __entry entry
 742
 743 #undef __get_dynamic_array
 744 #define __get_dynamic_array(field)      \
 745                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 746
 747 #undef __get_str
 748 #define __get_str(field) (char *)__get_dynamic_array(field)
 749
 750 #undef __perf_addr
 751 #define __perf_addr(a) __addr = (a)
 752
 753 #undef __perf_count
 754 #define __perf_count(c) __count = (c)
 755
 756 #undef DECLARE_EVENT_CLASS
 757 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 758 static notrace void                                                     \
 759 ftrace_profile_templ_##call(struct ftrace_event_call *event_call,       \
 760                             proto)                                      \
 761 {                                                                       \
 762         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 763         extern int perf_swevent_get_recursion_context(void);            \
 764         extern void perf_swevent_put_recursion_context(int rctx);       \
 765         extern void perf_tp_event(int, u64, u64, void *, int);          \
 766         struct ftrace_raw_##call *entry;                                \
 767         u64 __addr = 0, __count = 1;                                    \
 768         unsigned long irq_flags;                                        \
 769         struct trace_entry *ent;                                        \
 770         int __entry_size;                                               \
 771         int __data_size;                                                \
 772         char *trace_buf;                                                \
 773         char *raw_data;                                                 \
 774         int __cpu;                                                      \
 775         int rctx;                                                       \
 776         int pc;                                                         \
 777                                                                         \
 778         pc = preempt_count();                                           \
 779                                                                         \
 780         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 781         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 782                              sizeof(u64));                              \
 783         __entry_size -= sizeof(u32);                                    \
 784                                                                         \
 785         if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE,           \
 786                       "profile buffer not large enough"))               \
 787                 return;                                                 \
 788                                                                         \
 789         local_irq_save(irq_flags);                                      \
 790                                                                         \
 791         rctx = perf_swevent_get_recursion_context();                    \
 792         if (rctx < 0)                                                   \
 793                 goto end_recursion;                                     \
 794                                                                         \
 795         __cpu = smp_processor_id();                                     \
 796                                                                         \
 797         if (in_nmi())                                                   \
 798                 trace_buf = rcu_dereference(perf_trace_buf_nmi);        \
 799         else                                                            \
 800                 trace_buf = rcu_dereference(perf_trace_buf);            \
 801                                                                         \
 802         if (!trace_buf)                                                 \
 803                 goto end;                                               \
 804                                                                         \
 805         raw_data = per_cpu_ptr(trace_buf, __cpu);                       \
 806                                                                         \
 807         *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;         \
 808         entry = (struct ftrace_raw_##call *)raw_data;                   \
 809         ent = &entry->ent;                                              \
 810         tracing_generic_entry_update(ent, irq_flags, pc);               \
 811         ent->type = event_call->id;                                     \
 812                                                                         \
 813         tstruct                                                         \
 814                                                                         \
 815         { assign; }                                                     \
 816                                                                         \
 817         perf_tp_event(event_call->id, __addr, __count, entry,           \
 818                              __entry_size);                             \
 819                                                                         \
 820 end:                                                                    \
 821         perf_swevent_put_recursion_context(rctx);                       \
 822 end_recursion:                                                          \
 823         local_irq_restore(irq_flags);                                   \
 824 }
 825
 826 #undef DEFINE_EVENT
 827 #define DEFINE_EVENT(template, call, proto, args)               \
 828 static notrace void ftrace_profile_##call(proto)                \
 829 {                                                               \
 830         struct ftrace_event_call *event_call = &event_##call;   \
 831                                                                 \
 832         ftrace_profile_templ_##template(event_call, args);      \
 833 }
 834
 835 #undef DEFINE_EVENT_PRINT
 836 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 837         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 838
 839 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 840 #endif /* CONFIG_EVENT_PROFILE */
 841
 842 #undef _TRACE_PROFILE_INIT
 843