include/trace/ftrace.h

   1 /*
   2  * Stage 1 of the trace events.
   3  *
   4  * Override the macros in <trace/trace_events.h> to include the following:
   5  *
   6  * struct ftrace_raw_<call> {
   7  *      struct trace_entry              ent;
   8  *      <type>                          <item>;
   9  *      <type2>                         <item2>[<len>];
  10  *      [...]
  11  * };
  12  *
  13  * The <type> <item> is created by the __field(type, item) macro or
  14  * the __array(type2, item2, len) macro.
  15  * We simply do "type item;", and that will create the fields
  16  * in the structure.
  17  */
  18
  19 #include <linux/ftrace_event.h>
  20
  21 /*
  22  * DECLARE_EVENT_CLASS can be used to add a generic function
  23  * handlers for events. That is, if all events have the same
  24  * parameters and just have distinct trace points.
  25  * Each tracepoint can be defined with DEFINE_EVENT and that
  26  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  27  *
  28  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  29  */
  30 #undef TRACE_EVENT
  31 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  32         DECLARE_EVENT_CLASS(name,                              \
  33                              PARAMS(proto),                    \
  34                              PARAMS(args),                     \
  35                              PARAMS(tstruct),                  \
  36                              PARAMS(assign),                   \
  37                              PARAMS(print));                   \
  38         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  39
  40
  41 #undef __field
  42 #define __field(type, item)             type    item;
  43
  44 #undef __field_ext
  45 #define __field_ext(type, item, filter_type)    type    item;
  46
  47 #undef __array
  48 #define __array(type, item, len)        type    item[len];
  49
  50 #undef __dynamic_array
  51 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
  52
  53 #undef __string
  54 #define __string(item, src) __dynamic_array(char, item, -1)
  55
  56 #undef TP_STRUCT__entry
  57 #define TP_STRUCT__entry(args...) args
  58
  59 #undef DECLARE_EVENT_CLASS
  60 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
  61         struct ftrace_raw_##name {                                      \
  62                 struct trace_entry      ent;                            \
  63                 tstruct                                                 \
  64                 char                    __data[0];                      \
  65         };                                                              \
  66                                                                         \
  67         static struct ftrace_event_class event_class_##name;
  68
  69 #undef DEFINE_EVENT
  70 #define DEFINE_EVENT(template, name, proto, args)       \
  71         static struct ftrace_event_call __used          \
  72         __attribute__((__aligned__(4))) event_##name
  73
  74 #undef DEFINE_EVENT_PRINT
  75 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  76         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  77
  78 #undef __cpparg
  79 #define __cpparg(arg...) arg
  80
  81 /* Callbacks are meaningless to ftrace. */
  82 #undef TRACE_EVENT_FN
  83 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  84                 assign, print, reg, unreg)                              \
  85         TRACE_EVENT(name, __cpparg(proto), __cpparg(args),              \
  86                 __cpparg(tstruct), __cpparg(assign), __cpparg(print))   \
  87
  88 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  89
  90
  91 /*
  92  * Stage 2 of the trace events.
  93  *
  94  * Include the following:
  95  *
  96  * struct ftrace_data_offsets_<call> {
  97  *      u32                             <item1>;
  98  *      u32                             <item2>;
  99  *      [...]
 100  * };
 101  *
 102  * The __dynamic_array() macro will create each u32 <item>, this is
 103  * to keep the offset of each array from the beginning of the event.
 104  * The size of an array is also encoded, in the higher 16 bits of <item>.
 105  */
 106
 107 #undef __field
 108 #define __field(type, item)
 109
 110 #undef __field_ext
 111 #define __field_ext(type, item, filter_type)
 112
 113 #undef __array
 114 #define __array(type, item, len)
 115
 116 #undef __dynamic_array
 117 #define __dynamic_array(type, item, len)        u32 item;
 118
 119 #undef __string
 120 #define __string(item, src) __dynamic_array(char, item, -1)
 121
 122 #undef DECLARE_EVENT_CLASS
 123 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 124         struct ftrace_data_offsets_##call {                             \
 125                 tstruct;                                                \
 126         };
 127
 128 #undef DEFINE_EVENT
 129 #define DEFINE_EVENT(template, name, proto, args)
 130
 131 #undef DEFINE_EVENT_PRINT
 132 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 133         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 134
 135 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 136
 137 /*
 138  * Stage 3 of the trace events.
 139  *
 140  * Override the macros in <trace/trace_events.h> to include the following:
 141  *
 142  * enum print_line_t
 143  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 144  * {
 145  *      struct trace_seq *s = &iter->seq;
 146  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 147  *      struct trace_entry *entry;
 148  *      struct trace_seq *p;
 149  *      int ret;
 150  *
 151  *      entry = iter->ent;
 152  *
 153  *      if (entry->type != event_<call>->event.type) {
 154  *              WARN_ON_ONCE(1);
 155  *              return TRACE_TYPE_UNHANDLED;
 156  *      }
 157  *
 158  *      field = (typeof(field))entry;
 159  *
 160  *      p = &get_cpu_var(ftrace_event_seq);
 161  *      trace_seq_init(p);
 162  *      ret = trace_seq_printf(s, "%s: ", <call>);
 163  *      if (ret)
 164  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 165  *      put_cpu();
 166  *      if (!ret)
 167  *              return TRACE_TYPE_PARTIAL_LINE;
 168  *
 169  *      return TRACE_TYPE_HANDLED;
 170  * }
 171  *
 172  * This is the method used to print the raw event to the trace
 173  * output format. Note, this is not needed if the data is read
 174  * in binary.
 175  */
 176
 177 #undef __entry
 178 #define __entry field
 179
 180 #undef TP_printk
 181 #define TP_printk(fmt, args...) fmt "\n", args
 182
 183 #undef __get_dynamic_array
 184 #define __get_dynamic_array(field)      \
 185                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 186
 187 #undef __get_str
 188 #define __get_str(field) (char *)__get_dynamic_array(field)
 189
 190 #undef __print_flags
 191 #define __print_flags(flag, delim, flag_array...)                       \
 192         ({                                                              \
 193                 static const struct trace_print_flags __flags[] =       \
 194                         { flag_array, { -1, NULL }};                    \
 195                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 196         })
 197
 198 #undef __print_symbolic
 199 #define __print_symbolic(value, symbol_array...)                        \
 200         ({                                                              \
 201                 static const struct trace_print_flags symbols[] =       \
 202                         { symbol_array, { -1, NULL }};                  \
 203                 ftrace_print_symbols_seq(p, value, symbols);            \
 204         })
 205
 206 #undef __print_hex
 207 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
 208
 209 #undef DECLARE_EVENT_CLASS
 210 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 211 static notrace enum print_line_t                                        \
 212 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 213                          struct trace_event *trace_event)               \
 214 {                                                                       \
 215         struct ftrace_event_call *event;                                \
 216         struct trace_seq *s = &iter->seq;                               \
 217         struct ftrace_raw_##call *field;                                \
 218         struct trace_entry *entry;                                      \
 219         struct trace_seq *p;                                            \
 220         int ret;                                                        \
 221                                                                         \
 222         event = container_of(trace_event, struct ftrace_event_call,     \
 223                              event);                                    \
 224                                                                         \
 225         entry = iter->ent;                                              \
 226                                                                         \
 227         if (entry->type != event->event.type) {                         \
 228                 WARN_ON_ONCE(1);                                        \
 229                 return TRACE_TYPE_UNHANDLED;                            \
 230         }                                                               \
 231                                                                         \
 232         field = (typeof(field))entry;                                   \
 233                                                                         \
 234         p = &get_cpu_var(ftrace_event_seq);                             \
 235         trace_seq_init(p);                                              \
 236         ret = trace_seq_printf(s, "%s: ", event->name);                 \
 237         if (ret)                                                        \
 238                 ret = trace_seq_printf(s, print);                       \
 239         put_cpu();                                                      \
 240         if (!ret)                                                       \
 241                 return TRACE_TYPE_PARTIAL_LINE;                         \
 242                                                                         \
 243         return TRACE_TYPE_HANDLED;                                      \
 244 }                                                                       \
 245 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 246         .trace                  = ftrace_raw_output_##call,             \
 247 };
 248
 249 #undef DEFINE_EVENT_PRINT
 250 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 251 static notrace enum print_line_t                                        \
 252 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 253                          struct trace_event *event)                     \
 254 {                                                                       \
 255         struct trace_seq *s = &iter->seq;                               \
 256         struct ftrace_raw_##template *field;                            \
 257         struct trace_entry *entry;                                      \
 258         struct trace_seq *p;                                            \
 259         int ret;                                                        \
 260                                                                         \
 261         entry = iter->ent;                                              \
 262                                                                         \
 263         if (entry->type != event_##call.event.type) {                   \
 264                 WARN_ON_ONCE(1);                                        \
 265                 return TRACE_TYPE_UNHANDLED;                            \
 266         }                                                               \
 267                                                                         \
 268         field = (typeof(field))entry;                                   \
 269                                                                         \
 270         p = &get_cpu_var(ftrace_event_seq);                             \
 271         trace_seq_init(p);                                              \
 272         ret = trace_seq_printf(s, "%s: ", #call);                       \
 273         if (ret)                                                        \
 274                 ret = trace_seq_printf(s, print);                       \
 275         put_cpu();                                                      \
 276         if (!ret)                                                       \
 277                 return TRACE_TYPE_PARTIAL_LINE;                         \
 278                                                                         \
 279         return TRACE_TYPE_HANDLED;                                      \
 280 }                                                                       \
 281 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 282         .trace                  = ftrace_raw_output_##call,             \
 283 };
 284
 285 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 286
 287 #undef __field_ext
 288 #define __field_ext(type, item, filter_type)                            \
 289         ret = trace_define_field(event_call, #type, #item,              \
 290                                  offsetof(typeof(field), item),         \
 291                                  sizeof(field.item),                    \
 292                                  is_signed_type(type), filter_type);    \
 293         if (ret)                                                        \
 294                 return ret;
 295
 296 #undef __field
 297 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 298
 299 #undef __array
 300 #define __array(type, item, len)                                        \
 301         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 302         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 303                                  offsetof(typeof(field), item),         \
 304                                  sizeof(field.item),                    \
 305                                  is_signed_type(type), FILTER_OTHER);   \
 306         if (ret)                                                        \
 307                 return ret;
 308
 309 #undef __dynamic_array
 310 #define __dynamic_array(type, item, len)                                       \
 311         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 312                                  offsetof(typeof(field), __data_loc_##item),   \
 313                                  sizeof(field.__data_loc_##item),              \
 314                                  is_signed_type(type), FILTER_OTHER);
 315
 316 #undef __string
 317 #define __string(item, src) __dynamic_array(char, item, -1)
 318
 319 #undef DECLARE_EVENT_CLASS
 320 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 321 static int notrace                                                      \
 322 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 323 {                                                                       \
 324         struct ftrace_raw_##call field;                                 \
 325         int ret;                                                        \
 326                                                                         \
 327         tstruct;                                                        \
 328                                                                         \
 329         return ret;                                                     \
 330 }
 331
 332 #undef DEFINE_EVENT
 333 #define DEFINE_EVENT(template, name, proto, args)
 334
 335 #undef DEFINE_EVENT_PRINT
 336 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 337         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 338
 339 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 340
 341 /*
 342  * remember the offset of each array from the beginning of the event.
 343  */
 344
 345 #undef __entry
 346 #define __entry entry
 347
 348 #undef __field
 349 #define __field(type, item)
 350
 351 #undef __field_ext
 352 #define __field_ext(type, item, filter_type)
 353
 354 #undef __array
 355 #define __array(type, item, len)
 356
 357 #undef __dynamic_array
 358 #define __dynamic_array(type, item, len)                                \
 359         __data_offsets->item = __data_size +                            \
 360                                offsetof(typeof(*entry), __data);        \
 361         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 362         __data_size += (len) * sizeof(type);
 363
 364 #undef __string
 365 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
 366
 367 #undef DECLARE_EVENT_CLASS
 368 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 369 static inline notrace int ftrace_get_offsets_##call(                    \
 370         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 371 {                                                                       \
 372         int __data_size = 0;                                            \
 373         struct ftrace_raw_##call __maybe_unused *entry;                 \
 374                                                                         \
 375         tstruct;                                                        \
 376                                                                         \
 377         return __data_size;                                             \
 378 }
 379
 380 #undef DEFINE_EVENT
 381 #define DEFINE_EVENT(template, name, proto, args)
 382
 383 #undef DEFINE_EVENT_PRINT
 384 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 385         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 386
 387 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 388
 389 /*
 390  * Stage 4 of the trace events.
 391  *
 392  * Override the macros in <trace/trace_events.h> to include the following:
 393  *
 394  * For those macros defined with TRACE_EVENT:
 395  *
 396  * static struct ftrace_event_call event_<call>;
 397  *
 398  * static void ftrace_raw_event_<call>(void *__data, proto)
 399  * {
 400  *      struct ftrace_event_call *event_call = __data;
 401  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 402  *      struct ring_buffer_event *event;
 403  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 404  *      struct ring_buffer *buffer;
 405  *      unsigned long irq_flags;
 406  *      int __data_size;
 407  *      int pc;
 408  *
 409  *      local_save_flags(irq_flags);
 410  *      pc = preempt_count();
 411  *
 412  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 413  *
 414  *      event = trace_current_buffer_lock_reserve(&buffer,
 415  *                                event_<call>->event.type,
 416  *                                sizeof(*entry) + __data_size,
 417  *                                irq_flags, pc);
 418  *      if (!event)
 419  *              return;
 420  *      entry   = ring_buffer_event_data(event);
 421  *
 422  *      { <assign>; }  <-- Here we assign the entries by the __field and
 423  *                         __array macros.
 424  *
 425  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
 426  *              trace_current_buffer_unlock_commit(buffer,
 427  *                                                 event, irq_flags, pc);
 428  * }
 429  *
 430  * static struct trace_event ftrace_event_type_<call> = {
 431  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 432  * };
 433  *
 434  * static const char print_fmt_<call>[] = <TP_printk>;
 435  *
 436  * static struct ftrace_event_class __used event_class_<template> = {
 437  *      .system                 = "<system>",
 438  *      .define_fields          = ftrace_define_fields_<call>,
 439  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 440  *      .raw_init               = trace_event_raw_init,
 441  *      .probe                  = ftrace_raw_event_##call,
 442  * };
 443  *
 444  * static struct ftrace_event_call __used
 445  * __attribute__((__aligned__(4)))
 446  * __attribute__((section("_ftrace_events"))) event_<call> = {
 447  *      .name                   = "<call>",
 448  *      .class                  = event_class_<template>,
 449  *      .event                  = &ftrace_event_type_<call>,
 450  *      .print_fmt              = print_fmt_<call>,
 451  * };
 452  *
 453  */
 454
 455 #ifdef CONFIG_PERF_EVENTS
 456
 457 #define _TRACE_PERF_PROTO(call, proto)                                  \
 458         static notrace void                                             \
 459         perf_trace_##call(void *__data, proto);
 460
 461 #define _TRACE_PERF_INIT(call)                                          \
 462         .perf_probe             = perf_trace_##call,
 463
 464 #else
 465 #define _TRACE_PERF_PROTO(call, proto)
 466 #define _TRACE_PERF_INIT(call)
 467 #endif /* CONFIG_PERF_EVENTS */
 468
 469 #undef __entry
 470 #define __entry entry
 471
 472 #undef __field
 473 #define __field(type, item)
 474
 475 #undef __array
 476 #define __array(type, item, len)
 477
 478 #undef __dynamic_array
 479 #define __dynamic_array(type, item, len)                                \
 480         __entry->__data_loc_##item = __data_offsets.item;
 481
 482 #undef __string
 483 #define __string(item, src) __dynamic_array(char, item, -1)             \
 484
 485 #undef __assign_str
 486 #define __assign_str(dst, src)                                          \
 487         strcpy(__get_str(dst), src);
 488
 489 #undef TP_fast_assign
 490 #define TP_fast_assign(args...) args
 491
 492 #undef TP_perf_assign
 493 #define TP_perf_assign(args...)
 494
 495 #undef DECLARE_EVENT_CLASS
 496 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 497                                                                         \
 498 static notrace void                                                     \
 499 ftrace_raw_event_##call(void *__data, proto)                            \
 500 {                                                                       \
 501         struct ftrace_event_call *event_call = __data;                  \
 502         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 503         struct ring_buffer_event *event;                                \
 504         struct ftrace_raw_##call *entry;                                \
 505         struct ring_buffer *buffer;                                     \
 506         unsigned long irq_flags;                                        \
 507         int __data_size;                                                \
 508         int pc;                                                         \
 509                                                                         \
 510         local_save_flags(irq_flags);                                    \
 511         pc = preempt_count();                                           \
 512                                                                         \
 513         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 514                                                                         \
 515         event = trace_current_buffer_lock_reserve(&buffer,              \
 516                                  event_call->event.type,                \
 517                                  sizeof(*entry) + __data_size,          \
 518                                  irq_flags, pc);                        \
 519         if (!event)                                                     \
 520                 return;                                                 \
 521         entry   = ring_buffer_event_data(event);                        \
 522                                                                         \
 523         tstruct                                                         \
 524                                                                         \
 525         { assign; }                                                     \
 526                                                                         \
 527         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 528                 trace_nowake_buffer_unlock_commit(buffer,               \
 529                                                   event, irq_flags, pc); \
 530 }
 531 /*
 532  * The ftrace_test_probe is compiled out, it is only here as a build time check
 533  * to make sure that if the tracepoint handling changes, the ftrace probe will
 534  * fail to compile unless it too is updated.
 535  */
 536
 537 #undef DEFINE_EVENT
 538 #define DEFINE_EVENT(template, call, proto, args)                       \
 539 static inline void ftrace_test_probe_##call(void)                       \
 540 {                                                                       \
 541         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
 542 }
 543
 544 #undef DEFINE_EVENT_PRINT
 545 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 546
 547 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 548
 549 #undef __entry
 550 #define __entry REC
 551
 552 #undef __print_flags
 553 #undef __print_symbolic
 554 #undef __get_dynamic_array
 555 #undef __get_str
 556
 557 #undef TP_printk
 558 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 559
 560 #undef DECLARE_EVENT_CLASS
 561 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 562 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 563 static const char print_fmt_##call[] = print;                           \
 564 static struct ftrace_event_class __used event_class_##call = {          \
 565         .system                 = __stringify(TRACE_SYSTEM),            \
 566         .define_fields          = ftrace_define_fields_##call,          \
 567         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 568         .raw_init               = trace_event_raw_init,                 \
 569         .probe                  = ftrace_raw_event_##call,              \
 570         _TRACE_PERF_INIT(call)                                          \
 571 };
 572
 573 #undef DEFINE_EVENT
 574 #define DEFINE_EVENT(template, call, proto, args)                       \
 575                                                                         \
 576 static struct ftrace_event_call __used                                  \
 577 __attribute__((__aligned__(4)))                                         \
 578 __attribute__((section("_ftrace_events"))) event_##call = {             \
 579         .name                   = #call,                                \
 580         .class                  = &event_class_##template,              \
 581         .event.funcs            = &ftrace_event_type_funcs_##template,  \
 582         .print_fmt              = print_fmt_##template,                 \
 583 };
 584
 585 #undef DEFINE_EVENT_PRINT
 586 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 587                                                                         \
 588 static const char print_fmt_##call[] = print;                           \
 589                                                                         \
 590 static struct ftrace_event_call __used                                  \
 591 __attribute__((__aligned__(4)))                                         \
 592 __attribute__((section("_ftrace_events"))) event_##call = {             \
 593         .name                   = #call,                                \
 594         .class                  = &event_class_##template,              \
 595         .event.funcs            = &ftrace_event_type_funcs_##call,      \
 596         .print_fmt              = print_fmt_##call,                     \
 597 }
 598
 599 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 600
 601 /*
 602  * Define the insertion callback to perf events
 603  *
 604  * The job is very similar to ftrace_raw_event_<call> except that we don't
 605  * insert in the ring buffer but in a perf counter.
 606  *
 607  * static void ftrace_perf_<call>(proto)
 608  * {
 609  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 610  *      struct ftrace_event_call *event_call = &event_<call>;
 611  *      extern void perf_tp_event(int, u64, u64, void *, int);
 612  *      struct ftrace_raw_##call *entry;
 613  *      struct perf_trace_buf *trace_buf;
 614  *      u64 __addr = 0, __count = 1;
 615  *      unsigned long irq_flags;
 616  *      struct trace_entry *ent;
 617  *      int __entry_size;
 618  *      int __data_size;
 619  *      int __cpu
 620  *      int pc;
 621  *
 622  *      pc = preempt_count();
 623  *
 624  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 625  *
 626  *      // Below we want to get the aligned size by taking into account
 627  *      // the u32 field that will later store the buffer size
 628  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 629  *                           sizeof(u64));
 630  *      __entry_size -= sizeof(u32);
 631  *
 632  *      // Protect the non nmi buffer
 633  *      // This also protects the rcu read side
 634  *      local_irq_save(irq_flags);
 635  *      __cpu = smp_processor_id();
 636  *
 637  *      if (in_nmi())
 638  *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
 639  *      else
 640  *              trace_buf = rcu_dereference_sched(perf_trace_buf);
 641  *
 642  *      if (!trace_buf)
 643  *              goto end;
 644  *
 645  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
 646  *
 647  *      // Avoid recursion from perf that could mess up the buffer
 648  *      if (trace_buf->recursion++)
 649  *              goto end_recursion;
 650  *
 651  *      raw_data = trace_buf->buf;
 652  *
 653  *      // Make recursion update visible before entering perf_tp_event
 654  *      // so that we protect from perf recursions.
 655  *
 656  *      barrier();
 657  *
 658  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 659  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 660  *      entry = (struct ftrace_raw_<call> *)raw_data;
 661  *      ent = &entry->ent;
 662  *      tracing_generic_entry_update(ent, irq_flags, pc);
 663  *      ent->type = event_call->id;
 664  *
 665  *      <tstruct> <- do some jobs with dynamic arrays
 666  *
 667  *      <assign>  <- affect our values
 668  *
 669  *      perf_tp_event(event_call->id, __addr, __count, entry,
 670  *                   __entry_size);  <- submit them to perf counter
 671  *
 672  * }
 673  */
 674
 675 #ifdef CONFIG_PERF_EVENTS
 676
 677 #undef __entry
 678 #define __entry entry
 679
 680 #undef __get_dynamic_array
 681 #define __get_dynamic_array(field)      \
 682                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 683
 684 #undef __get_str
 685 #define __get_str(field) (char *)__get_dynamic_array(field)
 686
 687 #undef __perf_addr
 688 #define __perf_addr(a) __addr = (a)
 689
 690 #undef __perf_count
 691 #define __perf_count(c) __count = (c)
 692
 693 #undef DECLARE_EVENT_CLASS
 694 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 695 static notrace void                                                     \
 696 perf_trace_##call(void *__data, proto)                                  \
 697 {                                                                       \
 698         struct ftrace_event_call *event_call = __data;                  \
 699         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 700         struct ftrace_raw_##call *entry;                                \
 701         struct pt_regs __regs;                                          \
 702         u64 __addr = 0, __count = 1;                                    \
 703         struct hlist_head *head;                                        \
 704         int __entry_size;                                               \
 705         int __data_size;                                                \
 706         int rctx;                                                       \
 707                                                                         \
 708         perf_fetch_caller_regs(&__regs, 1);                             \
 709                                                                         \
 710         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 711         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 712                              sizeof(u64));                              \
 713         __entry_size -= sizeof(u32);                                    \
 714                                                                         \
 715         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
 716                       "profile buffer not large enough"))               \
 717                 return;                                                 \
 718                                                                         \
 719         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
 720                 __entry_size, event_call->event.type, &__regs, &rctx);  \
 721         if (!entry)                                                     \
 722                 return;                                                 \
 723                                                                         \
 724         tstruct                                                         \
 725                                                                         \
 726         { assign; }                                                     \
 727                                                                         \
 728         head = per_cpu_ptr(event_call->perf_events, smp_processor_id());\
 729         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 730                 __count, &__regs, head);                                \
 731 }
 732
 733 /*
 734  * This part is compiled out, it is only here as a build time check
 735  * to make sure that if the tracepoint handling changes, the
 736  * perf probe will fail to compile unless it too is updated.
 737  */
 738 #undef DEFINE_EVENT
 739 #define DEFINE_EVENT(template, call, proto, args)                       \
 740 static inline void perf_test_probe_##call(void)                         \
 741 {                                                                       \
 742         check_trace_callback_type_##call(perf_trace_##template);        \
 743 }
 744
 745
 746 #undef DEFINE_EVENT_PRINT
 747 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 748         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 749
 750 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 751 #endif /* CONFIG_PERF_EVENTS */
 752
 753 #undef _TRACE_PROFILE_INIT
 754