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 #undef __field
  22 #define __field(type, item)             type    item;
  23
  24 #undef __field_ext
  25 #define __field_ext(type, item, filter_type)    type    item;
  26
  27 #undef __array
  28 #define __array(type, item, len)        type    item[len];
  29
  30 #undef __dynamic_array
  31 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
  32
  33 #undef __string
  34 #define __string(item, src) __dynamic_array(char, item, -1)
  35
  36 #undef TP_STRUCT__entry
  37 #define TP_STRUCT__entry(args...) args
  38
  39 #undef TRACE_EVENT
  40 #define TRACE_EVENT(name, proto, args, tstruct, assign, print)  \
  41         struct ftrace_raw_##name {                              \
  42                 struct trace_entry      ent;                    \
  43                 tstruct                                         \
  44                 char                    __data[0];              \
  45         };                                                      \
  46         static struct ftrace_event_call event_##name
  47
  48 #undef __cpparg
  49 #define __cpparg(arg...) arg
  50
  51 /* Callbacks are meaningless to ftrace. */
  52 #undef TRACE_EVENT_FN
  53 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  54                 assign, print, reg, unreg)                              \
  55         TRACE_EVENT(name, __cpparg(proto), __cpparg(args),              \
  56                 __cpparg(tstruct), __cpparg(assign), __cpparg(print))   \
  57
  58 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  59
  60
  61 /*
  62  * Stage 2 of the trace events.
  63  *
  64  * Include the following:
  65  *
  66  * struct ftrace_data_offsets_<call> {
  67  *      u32                             <item1>;
  68  *      u32                             <item2>;
  69  *      [...]
  70  * };
  71  *
  72  * The __dynamic_array() macro will create each u32 <item>, this is
  73  * to keep the offset of each array from the beginning of the event.
  74  * The size of an array is also encoded, in the higher 16 bits of <item>.
  75  */
  76
  77 #undef __field
  78 #define __field(type, item)
  79
  80 #undef __field_ext
  81 #define __field_ext(type, item, filter_type)
  82
  83 #undef __array
  84 #define __array(type, item, len)
  85
  86 #undef __dynamic_array
  87 #define __dynamic_array(type, item, len)        u32 item;
  88
  89 #undef __string
  90 #define __string(item, src) __dynamic_array(char, item, -1)
  91
  92 #undef TRACE_EVENT
  93 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
  94         struct ftrace_data_offsets_##call {                             \
  95                 tstruct;                                                \
  96         };
  97
  98 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  99
 100 /*
 101  * Setup the showing format of trace point.
 102  *
 103  * int
 104  * ftrace_format_##call(struct trace_seq *s)
 105  * {
 106  *      struct ftrace_raw_##call field;
 107  *      int ret;
 108  *
 109  *      ret = trace_seq_printf(s, #type " " #item ";"
 110  *                             " offset:%u; size:%u;\n",
 111  *                             offsetof(struct ftrace_raw_##call, item),
 112  *                             sizeof(field.type));
 113  *
 114  * }
 115  */
 116
 117 #undef TP_STRUCT__entry
 118 #define TP_STRUCT__entry(args...) args
 119
 120 #undef __field
 121 #define __field(type, item)                                     \
 122         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
 123                                "offset:%u;\tsize:%u;\n",                \
 124                                (unsigned int)offsetof(typeof(field), item), \
 125                                (unsigned int)sizeof(field.item));       \
 126         if (!ret)                                                       \
 127                 return 0;
 128
 129 #undef __field_ext
 130 #define __field_ext(type, item, filter_type)    __field(type, item)
 131
 132 #undef __array
 133 #define __array(type, item, len)                                                \
 134         ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
 135                                "offset:%u;\tsize:%u;\n",                \
 136                                (unsigned int)offsetof(typeof(field), item), \
 137                                (unsigned int)sizeof(field.item));       \
 138         if (!ret)                                                       \
 139                 return 0;
 140
 141 #undef __dynamic_array
 142 #define __dynamic_array(type, item, len)                                       \
 143         ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
 144                                "offset:%u;\tsize:%u;\n",                       \
 145                                (unsigned int)offsetof(typeof(field),           \
 146                                         __data_loc_##item),                    \
 147                                (unsigned int)sizeof(field.__data_loc_##item)); \
 148         if (!ret)                                                              \
 149                 return 0;
 150
 151 #undef __string
 152 #define __string(item, src) __dynamic_array(char, item, -1)
 153
 154 #undef __entry
 155 #define __entry REC
 156
 157 #undef __print_symbolic
 158 #undef __get_dynamic_array
 159 #undef __get_str
 160
 161 #undef TP_printk
 162 #define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
 163
 164 #undef TP_fast_assign
 165 #define TP_fast_assign(args...) args
 166
 167 #undef TP_perf_assign
 168 #define TP_perf_assign(args...)
 169
 170 #undef TRACE_EVENT
 171 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
 172 static int                                                              \
 173 ftrace_format_##call(struct ftrace_event_call *unused,                  \
 174                       struct trace_seq *s)                              \
 175 {                                                                       \
 176         struct ftrace_raw_##call field __attribute__((unused));         \
 177         int ret = 0;                                                    \
 178                                                                         \
 179         tstruct;                                                        \
 180                                                                         \
 181         trace_seq_printf(s, "\nprint fmt: " print);                     \
 182                                                                         \
 183         return ret;                                                     \
 184 }
 185
 186 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 187
 188 /*
 189  * Stage 3 of the trace events.
 190  *
 191  * Override the macros in <trace/trace_events.h> to include the following:
 192  *
 193  * enum print_line_t
 194  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 195  * {
 196  *      struct trace_seq *s = &iter->seq;
 197  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 198  *      struct trace_entry *entry;
 199  *      struct trace_seq *p;
 200  *      int ret;
 201  *
 202  *      entry = iter->ent;
 203  *
 204  *      if (entry->type != event_<call>.id) {
 205  *              WARN_ON_ONCE(1);
 206  *              return TRACE_TYPE_UNHANDLED;
 207  *      }
 208  *
 209  *      field = (typeof(field))entry;
 210  *
 211  *      p = get_cpu_var(ftrace_event_seq);
 212  *      trace_seq_init(p);
 213  *      ret = trace_seq_printf(s, <TP_printk> "\n");
 214  *      put_cpu();
 215  *      if (!ret)
 216  *              return TRACE_TYPE_PARTIAL_LINE;
 217  *
 218  *      return TRACE_TYPE_HANDLED;
 219  * }
 220  *
 221  * This is the method used to print the raw event to the trace
 222  * output format. Note, this is not needed if the data is read
 223  * in binary.
 224  */
 225
 226 #undef __entry
 227 #define __entry field
 228
 229 #undef TP_printk
 230 #define TP_printk(fmt, args...) fmt "\n", args
 231
 232 #undef __get_dynamic_array
 233 #define __get_dynamic_array(field)      \
 234                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 235
 236 #undef __get_str
 237 #define __get_str(field) (char *)__get_dynamic_array(field)
 238
 239 #undef __print_flags
 240 #define __print_flags(flag, delim, flag_array...)                       \
 241         ({                                                              \
 242                 static const struct trace_print_flags __flags[] =       \
 243                         { flag_array, { -1, NULL }};                    \
 244                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 245         })
 246
 247 #undef __print_symbolic
 248 #define __print_symbolic(value, symbol_array...)                        \
 249         ({                                                              \
 250                 static const struct trace_print_flags symbols[] =       \
 251                         { symbol_array, { -1, NULL }};                  \
 252                 ftrace_print_symbols_seq(p, value, symbols);            \
 253         })
 254
 255 #undef TRACE_EVENT
 256 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 257 static enum print_line_t                                                \
 258 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
 259 {                                                                       \
 260         struct trace_seq *s = &iter->seq;                               \
 261         struct ftrace_raw_##call *field;                                \
 262         struct trace_entry *entry;                                      \
 263         struct trace_seq *p;                                            \
 264         int ret;                                                        \
 265                                                                         \
 266         entry = iter->ent;                                              \
 267                                                                         \
 268         if (entry->type != event_##call.id) {                           \
 269                 WARN_ON_ONCE(1);                                        \
 270                 return TRACE_TYPE_UNHANDLED;                            \
 271         }                                                               \
 272                                                                         \
 273         field = (typeof(field))entry;                                   \
 274                                                                         \
 275         p = &get_cpu_var(ftrace_event_seq);                             \
 276         trace_seq_init(p);                                              \
 277         ret = trace_seq_printf(s, #call ": " print);                    \
 278         put_cpu();                                                      \
 279         if (!ret)                                                       \
 280                 return TRACE_TYPE_PARTIAL_LINE;                         \
 281                                                                         \
 282         return TRACE_TYPE_HANDLED;                                      \
 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), 0, FILTER_OTHER);  \
 305         if (ret)                                                        \
 306                 return ret;
 307
 308 #undef __dynamic_array
 309 #define __dynamic_array(type, item, len)                                       \
 310         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 311                                  offsetof(typeof(field), __data_loc_##item),   \
 312                                  sizeof(field.__data_loc_##item), 0,           \
 313                                  FILTER_OTHER);
 314
 315 #undef __string
 316 #define __string(item, src) __dynamic_array(char, item, -1)
 317
 318 #undef TRACE_EVENT
 319 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
 320 static int                                                              \
 321 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 322 {                                                                       \
 323         struct ftrace_raw_##call field;                                 \
 324         int ret;                                                        \
 325                                                                         \
 326         ret = trace_define_common_fields(event_call);                   \
 327         if (ret)                                                        \
 328                 return ret;                                             \
 329                                                                         \
 330         tstruct;                                                        \
 331                                                                         \
 332         return ret;                                                     \
 333 }
 334
 335 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 336
 337 /*
 338  * remember the offset of each array from the beginning of the event.
 339  */
 340
 341 #undef __entry
 342 #define __entry entry
 343
 344 #undef __field
 345 #define __field(type, item)
 346
 347 #undef __field_ext
 348 #define __field_ext(type, item, filter_type)
 349
 350 #undef __array
 351 #define __array(type, item, len)
 352
 353 #undef __dynamic_array
 354 #define __dynamic_array(type, item, len)                                \
 355         __data_offsets->item = __data_size +                            \
 356                                offsetof(typeof(*entry), __data);        \
 357         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 358         __data_size += (len) * sizeof(type);
 359
 360 #undef __string
 361 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)       \
 362
 363 #undef TRACE_EVENT
 364 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 365 static inline int ftrace_get_offsets_##call(                            \
 366         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 367 {                                                                       \
 368         int __data_size = 0;                                            \
 369         struct ftrace_raw_##call __maybe_unused *entry;                 \
 370                                                                         \
 371         tstruct;                                                        \
 372                                                                         \
 373         return __data_size;                                             \
 374 }
 375
 376 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 377
 378 #ifdef CONFIG_EVENT_PROFILE
 379
 380 /*
 381  * Generate the functions needed for tracepoint perf_counter support.
 382  *
 383  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
 384  *
 385  * static int ftrace_profile_enable_<call>(struct ftrace_event_call *event_call)
 386  * {
 387  *      int ret = 0;
 388  *
 389  *      if (!atomic_inc_return(&event_call->profile_count))
 390  *              ret = register_trace_<call>(ftrace_profile_<call>);
 391  *
 392  *      return ret;
 393  * }
 394  *
 395  * static void ftrace_profile_disable_<call>(struct ftrace_event_call *event_call)
 396  * {
 397  *      if (atomic_add_negative(-1, &event->call->profile_count))
 398  *              unregister_trace_<call>(ftrace_profile_<call>);
 399  * }
 400  *
 401  */
 402
 403 #undef TRACE_EVENT
 404 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 405                                                                         \
 406 static void ftrace_profile_##call(proto);                               \
 407                                                                         \
 408 static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
 409 {                                                                       \
 410         int ret = 0;                                                    \
 411                                                                         \
 412         if (!atomic_inc_return(&event_call->profile_count))             \
 413                 ret = register_trace_##call(ftrace_profile_##call);     \
 414                                                                         \
 415         return ret;                                                     \
 416 }                                                                       \
 417                                                                         \
 418 static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
 419 {                                                                       \
 420         if (atomic_add_negative(-1, &event_call->profile_count))        \
 421                 unregister_trace_##call(ftrace_profile_##call);         \
 422 }
 423
 424 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 425
 426 #endif
 427
 428 /*
 429  * Stage 4 of the trace events.
 430  *
 431  * Override the macros in <trace/trace_events.h> to include the following:
 432  *
 433  * static void ftrace_event_<call>(proto)
 434  * {
 435  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
 436  * }
 437  *
 438  * static int ftrace_reg_event_<call>(void)
 439  * {
 440  *      int ret;
 441  *
 442  *      ret = register_trace_<call>(ftrace_event_<call>);
 443  *      if (!ret)
 444  *              pr_info("event trace: Could not activate trace point "
 445  *                      "probe to  <call>");
 446  *      return ret;
 447  * }
 448  *
 449  * static void ftrace_unreg_event_<call>(void)
 450  * {
 451  *      unregister_trace_<call>(ftrace_event_<call>);
 452  * }
 453  *
 454  *
 455  * For those macros defined with TRACE_EVENT:
 456  *
 457  * static struct ftrace_event_call event_<call>;
 458  *
 459  * static void ftrace_raw_event_<call>(proto)
 460  * {
 461  *      struct ring_buffer_event *event;
 462  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 463  *      struct ring_buffer *buffer;
 464  *      unsigned long irq_flags;
 465  *      int pc;
 466  *
 467  *      local_save_flags(irq_flags);
 468  *      pc = preempt_count();
 469  *
 470  *      event = trace_current_buffer_lock_reserve(&buffer,
 471  *                                event_<call>.id,
 472  *                                sizeof(struct ftrace_raw_<call>),
 473  *                                irq_flags, pc);
 474  *      if (!event)
 475  *              return;
 476  *      entry   = ring_buffer_event_data(event);
 477  *
 478  *      <assign>;  <-- Here we assign the entries by the __field and
 479  *                      __array macros.
 480  *
 481  *      trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
 482  * }
 483  *
 484  * static int ftrace_raw_reg_event_<call>(void)
 485  * {
 486  *      int ret;
 487  *
 488  *      ret = register_trace_<call>(ftrace_raw_event_<call>);
 489  *      if (!ret)
 490  *              pr_info("event trace: Could not activate trace point "
 491  *                      "probe to <call>");
 492  *      return ret;
 493  * }
 494  *
 495  * static void ftrace_unreg_event_<call>(void)
 496  * {
 497  *      unregister_trace_<call>(ftrace_raw_event_<call>);
 498  * }
 499  *
 500  * static struct trace_event ftrace_event_type_<call> = {
 501  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 502  * };
 503  *
 504  * static int ftrace_raw_init_event_<call>(void)
 505  * {
 506  *      int id;
 507  *
 508  *      id = register_ftrace_event(&ftrace_event_type_<call>);
 509  *      if (!id)
 510  *              return -ENODEV;
 511  *      event_<call>.id = id;
 512  *      return 0;
 513  * }
 514  *
 515  * static struct ftrace_event_call __used
 516  * __attribute__((__aligned__(4)))
 517  * __attribute__((section("_ftrace_events"))) event_<call> = {
 518  *      .name                   = "<call>",
 519  *      .system                 = "<system>",
 520  *      .raw_init               = ftrace_raw_init_event_<call>,
 521  *      .regfunc                = ftrace_reg_event_<call>,
 522  *      .unregfunc              = ftrace_unreg_event_<call>,
 523  *      .show_format            = ftrace_format_<call>,
 524  * }
 525  *
 526  */
 527
 528 #undef TP_FMT
 529 #define TP_FMT(fmt, args...)    fmt "\n", ##args
 530
 531 #ifdef CONFIG_EVENT_PROFILE
 532
 533 #define _TRACE_PROFILE_INIT(call)                                       \
 534         .profile_count = ATOMIC_INIT(-1),                               \
 535         .profile_enable = ftrace_profile_enable_##call,                 \
 536         .profile_disable = ftrace_profile_disable_##call,
 537
 538 #else
 539 #define _TRACE_PROFILE_INIT(call)
 540 #endif
 541
 542 #undef __entry
 543 #define __entry entry
 544
 545 #undef __field
 546 #define __field(type, item)
 547
 548 #undef __array
 549 #define __array(type, item, len)
 550
 551 #undef __dynamic_array
 552 #define __dynamic_array(type, item, len)                                \
 553         __entry->__data_loc_##item = __data_offsets.item;
 554
 555 #undef __string
 556 #define __string(item, src) __dynamic_array(char, item, -1)             \
 557
 558 #undef __assign_str
 559 #define __assign_str(dst, src)                                          \
 560         strcpy(__get_str(dst), src);
 561
 562 #undef TRACE_EVENT
 563 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 564                                                                         \
 565 static struct ftrace_event_call event_##call;                           \
 566                                                                         \
 567 static void ftrace_raw_event_##call(proto)                              \
 568 {                                                                       \
 569         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 570         struct ftrace_event_call *event_call = &event_##call;           \
 571         struct ring_buffer_event *event;                                \
 572         struct ftrace_raw_##call *entry;                                \
 573         struct ring_buffer *buffer;                                     \
 574         unsigned long irq_flags;                                        \
 575         int __data_size;                                                \
 576         int pc;                                                         \
 577                                                                         \
 578         local_save_flags(irq_flags);                                    \
 579         pc = preempt_count();                                           \
 580                                                                         \
 581         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 582                                                                         \
 583         event = trace_current_buffer_lock_reserve(&buffer,              \
 584                                  event_##call.id,                       \
 585                                  sizeof(*entry) + __data_size,          \
 586                                  irq_flags, pc);                        \
 587         if (!event)                                                     \
 588                 return;                                                 \
 589         entry   = ring_buffer_event_data(event);                        \
 590                                                                         \
 591                                                                         \
 592         tstruct                                                         \
 593                                                                         \
 594         { assign; }                                                     \
 595                                                                         \
 596         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 597                 trace_nowake_buffer_unlock_commit(buffer,               \
 598                                                   event, irq_flags, pc); \
 599 }                                                                       \
 600                                                                         \
 601 static int ftrace_raw_reg_event_##call(void *ptr)                       \
 602 {                                                                       \
 603         int ret;                                                        \
 604                                                                         \
 605         ret = register_trace_##call(ftrace_raw_event_##call);           \
 606         if (ret)                                                        \
 607                 pr_info("event trace: Could not activate trace point "  \
 608                         "probe to " #call "\n");                        \
 609         return ret;                                                     \
 610 }                                                                       \
 611                                                                         \
 612 static void ftrace_raw_unreg_event_##call(void *ptr)                    \
 613 {                                                                       \
 614         unregister_trace_##call(ftrace_raw_event_##call);               \
 615 }                                                                       \
 616                                                                         \
 617 static struct trace_event ftrace_event_type_##call = {                  \
 618         .trace                  = ftrace_raw_output_##call,             \
 619 };                                                                      \
 620                                                                         \
 621 static int ftrace_raw_init_event_##call(void)                           \
 622 {                                                                       \
 623         int id;                                                         \
 624                                                                         \
 625         id = register_ftrace_event(&ftrace_event_type_##call);          \
 626         if (!id)                                                        \
 627                 return -ENODEV;                                         \
 628         event_##call.id = id;                                           \
 629         INIT_LIST_HEAD(&event_##call.fields);                           \
 630         return 0;                                                       \
 631 }                                                                       \
 632                                                                         \
 633 static struct ftrace_event_call __used                                  \
 634 __attribute__((__aligned__(4)))                                         \
 635 __attribute__((section("_ftrace_events"))) event_##call = {             \
 636         .name                   = #call,                                \
 637         .system                 = __stringify(TRACE_SYSTEM),            \
 638         .event                  = &ftrace_event_type_##call,            \
 639         .raw_init               = ftrace_raw_init_event_##call,         \
 640         .regfunc                = ftrace_raw_reg_event_##call,          \
 641         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 642         .show_format            = ftrace_format_##call,                 \
 643         .define_fields          = ftrace_define_fields_##call,          \
 644         _TRACE_PROFILE_INIT(call)                                       \
 645 }
 646
 647 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 648
 649 /*
 650  * Define the insertion callback to profile events
 651  *
 652  * The job is very similar to ftrace_raw_event_<call> except that we don't
 653  * insert in the ring buffer but in a perf counter.
 654  *
 655  * static void ftrace_profile_<call>(proto)
 656  * {
 657  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 658  *      struct ftrace_event_call *event_call = &event_<call>;
 659  *      extern void perf_tpcounter_event(int, u64, u64, void *, int);
 660  *      struct ftrace_raw_##call *entry;
 661  *      u64 __addr = 0, __count = 1;
 662  *      unsigned long irq_flags;
 663  *      int __entry_size;
 664  *      int __data_size;
 665  *      int pc;
 666  *
 667  *      local_save_flags(irq_flags);
 668  *      pc = preempt_count();
 669  *
 670  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 671  *
 672  *      // Below we want to get the aligned size by taking into account
 673  *      // the u32 field that will later store the buffer size
 674  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 675  *                           sizeof(u64));
 676  *      __entry_size -= sizeof(u32);
 677  *
 678  *      do {
 679  *              char raw_data[__entry_size]; <- allocate our sample in the stack
 680  *              struct trace_entry *ent;
 681  *
 682  *              zero dead bytes from alignment to avoid stack leak to userspace:
 683  *
 684  *              *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 685  *              entry = (struct ftrace_raw_<call> *)raw_data;
 686  *              ent = &entry->ent;
 687  *              tracing_generic_entry_update(ent, irq_flags, pc);
 688  *              ent->type = event_call->id;
 689  *
 690  *              <tstruct> <- do some jobs with dynamic arrays
 691  *
 692  *              <assign>  <- affect our values
 693  *
 694  *              perf_tpcounter_event(event_call->id, __addr, __count, entry,
 695  *                           __entry_size);  <- submit them to perf counter
 696  *      } while (0);
 697  *
 698  * }
 699  */
 700
 701 #ifdef CONFIG_EVENT_PROFILE
 702
 703 #undef __perf_addr
 704 #define __perf_addr(a) __addr = (a)
 705
 706 #undef __perf_count
 707 #define __perf_count(c) __count = (c)
 708
 709 #undef TRACE_EVENT
 710 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 711 static void ftrace_profile_##call(proto)                                \
 712 {                                                                       \
 713         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 714         struct ftrace_event_call *event_call = &event_##call;           \
 715         extern void perf_tpcounter_event(int, u64, u64, void *, int);   \
 716         struct ftrace_raw_##call *entry;                                \
 717         u64 __addr = 0, __count = 1;                                    \
 718         unsigned long irq_flags;                                        \
 719         int __entry_size;                                               \
 720         int __data_size;                                                \
 721         int pc;                                                         \
 722                                                                         \
 723         local_save_flags(irq_flags);                                    \
 724         pc = preempt_count();                                           \
 725                                                                         \
 726         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 727         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 728                              sizeof(u64));                              \
 729         __entry_size -= sizeof(u32);                                    \
 730                                                                         \
 731         do {                                                            \
 732                 char raw_data[__entry_size];                            \
 733                 struct trace_entry *ent;                                \
 734                                                                         \
 735                 *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
 736                 entry = (struct ftrace_raw_##call *)raw_data;           \
 737                 ent = &entry->ent;                                      \
 738                 tracing_generic_entry_update(ent, irq_flags, pc);       \
 739                 ent->type = event_call->id;                             \
 740                                                                         \
 741                 tstruct                                                 \
 742                                                                         \
 743                 { assign; }                                             \
 744                                                                         \
 745                 perf_tpcounter_event(event_call->id, __addr, __count, entry,\
 746                              __entry_size);                             \
 747         } while (0);                                                    \
 748                                                                         \
 749 }
 750
 751 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 752 #endif /* CONFIG_EVENT_PROFILE */
 753
 754 #undef _TRACE_PROFILE_INIT
 755