SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  49
  50
  51 /*
  52  * Stage 2 of the trace events.
  53  *
  54  * Include the following:
  55  *
  56  * struct ftrace_data_offsets_<call> {
  57  *      u32                             <item1>;
  58  *      u32                             <item2>;
  59  *      [...]
  60  * };
  61  *
  62  * The __dynamic_array() macro will create each u32 <item>, this is
  63  * to keep the offset of each array from the beginning of the event.
  64  * The size of an array is also encoded, in the higher 16 bits of <item>.
  65  */
  66
  67 #undef __field
  68 #define __field(type, item)
  69
  70 #undef __field_ext
  71 #define __field_ext(type, item, filter_type)
  72
  73 #undef __array
  74 #define __array(type, item, len)
  75
  76 #undef __dynamic_array
  77 #define __dynamic_array(type, item, len)        u32 item;
  78
  79 #undef __string
  80 #define __string(item, src) __dynamic_array(char, item, -1)
  81
  82 #undef TRACE_EVENT
  83 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
  84         struct ftrace_data_offsets_##call {                             \
  85                 tstruct;                                                \
  86         };
  87
  88 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  89
  90 /*
  91  * Setup the showing format of trace point.
  92  *
  93  * int
  94  * ftrace_format_##call(struct trace_seq *s)
  95  * {
  96  *      struct ftrace_raw_##call field;
  97  *      int ret;
  98  *
  99  *      ret = trace_seq_printf(s, #type " " #item ";"
 100  *                             " offset:%u; size:%u;\n",
 101  *                             offsetof(struct ftrace_raw_##call, item),
 102  *                             sizeof(field.type));
 103  *
 104  * }
 105  */
 106
 107 #undef TP_STRUCT__entry
 108 #define TP_STRUCT__entry(args...) args
 109
 110 #undef __field
 111 #define __field(type, item)                                     \
 112         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
 113                                "offset:%u;\tsize:%u;\n",                \
 114                                (unsigned int)offsetof(typeof(field), item), \
 115                                (unsigned int)sizeof(field.item));       \
 116         if (!ret)                                                       \
 117                 return 0;
 118
 119 #undef __field_ext
 120 #define __field_ext(type, item, filter_type)    __field(type, item)
 121
 122 #undef __array
 123 #define __array(type, item, len)                                                \
 124         ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
 125                                "offset:%u;\tsize:%u;\n",                \
 126                                (unsigned int)offsetof(typeof(field), item), \
 127                                (unsigned int)sizeof(field.item));       \
 128         if (!ret)                                                       \
 129                 return 0;
 130
 131 #undef __dynamic_array
 132 #define __dynamic_array(type, item, len)                                       \
 133         ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
 134                                "offset:%u;\tsize:%u;\n",                       \
 135                                (unsigned int)offsetof(typeof(field),           \
 136                                         __data_loc_##item),                    \
 137                                (unsigned int)sizeof(field.__data_loc_##item)); \
 138         if (!ret)                                                              \
 139                 return 0;
 140
 141 #undef __string
 142 #define __string(item, src) __dynamic_array(char, item, -1)
 143
 144 #undef __entry
 145 #define __entry REC
 146
 147 #undef __print_symbolic
 148 #undef __get_dynamic_array
 149 #undef __get_str
 150
 151 #undef TP_printk
 152 #define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
 153
 154 #undef TP_fast_assign
 155 #define TP_fast_assign(args...) args
 156
 157 #undef TP_perf_assign
 158 #define TP_perf_assign(args...)
 159
 160 #undef TRACE_EVENT
 161 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
 162 static int                                                              \
 163 ftrace_format_##call(struct ftrace_event_call *unused,                  \
 164                       struct trace_seq *s)                              \
 165 {                                                                       \
 166         struct ftrace_raw_##call field __attribute__((unused));         \
 167         int ret = 0;                                                    \
 168                                                                         \
 169         tstruct;                                                        \
 170                                                                         \
 171         trace_seq_printf(s, "\nprint fmt: " print);                     \
 172                                                                         \
 173         return ret;                                                     \
 174 }
 175
 176 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 177
 178 /*
 179  * Stage 3 of the trace events.
 180  *
 181  * Override the macros in <trace/trace_events.h> to include the following:
 182  *
 183  * enum print_line_t
 184  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 185  * {
 186  *      struct trace_seq *s = &iter->seq;
 187  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 188  *      struct trace_entry *entry;
 189  *      struct trace_seq *p;
 190  *      int ret;
 191  *
 192  *      entry = iter->ent;
 193  *
 194  *      if (entry->type != event_<call>.id) {
 195  *              WARN_ON_ONCE(1);
 196  *              return TRACE_TYPE_UNHANDLED;
 197  *      }
 198  *
 199  *      field = (typeof(field))entry;
 200  *
 201  *      p = get_cpu_var(ftrace_event_seq);
 202  *      trace_seq_init(p);
 203  *      ret = trace_seq_printf(s, <TP_printk> "\n");
 204  *      put_cpu();
 205  *      if (!ret)
 206  *              return TRACE_TYPE_PARTIAL_LINE;
 207  *
 208  *      return TRACE_TYPE_HANDLED;
 209  * }
 210  *
 211  * This is the method used to print the raw event to the trace
 212  * output format. Note, this is not needed if the data is read
 213  * in binary.
 214  */
 215
 216 #undef __entry
 217 #define __entry field
 218
 219 #undef TP_printk
 220 #define TP_printk(fmt, args...) fmt "\n", args
 221
 222 #undef __get_dynamic_array
 223 #define __get_dynamic_array(field)      \
 224                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 225
 226 #undef __get_str
 227 #define __get_str(field) (char *)__get_dynamic_array(field)
 228
 229 #undef __print_flags
 230 #define __print_flags(flag, delim, flag_array...)                       \
 231         ({                                                              \
 232                 static const struct trace_print_flags flags[] =         \
 233                         { flag_array, { -1, NULL }};                    \
 234                 ftrace_print_flags_seq(p, delim, flag, flags);          \
 235         })
 236
 237 #undef __print_symbolic
 238 #define __print_symbolic(value, symbol_array...)                        \
 239         ({                                                              \
 240                 static const struct trace_print_flags symbols[] =       \
 241                         { symbol_array, { -1, NULL }};                  \
 242                 ftrace_print_symbols_seq(p, value, symbols);            \
 243         })
 244
 245 #undef TRACE_EVENT
 246 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 247 enum print_line_t                                                       \
 248 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
 249 {                                                                       \
 250         struct trace_seq *s = &iter->seq;                               \
 251         struct ftrace_raw_##call *field;                                \
 252         struct trace_entry *entry;                                      \
 253         struct trace_seq *p;                                            \
 254         int ret;                                                        \
 255                                                                         \
 256         entry = iter->ent;                                              \
 257                                                                         \
 258         if (entry->type != event_##call.id) {                           \
 259                 WARN_ON_ONCE(1);                                        \
 260                 return TRACE_TYPE_UNHANDLED;                            \
 261         }                                                               \
 262                                                                         \
 263         field = (typeof(field))entry;                                   \
 264                                                                         \
 265         p = &get_cpu_var(ftrace_event_seq);                             \
 266         trace_seq_init(p);                                              \
 267         ret = trace_seq_printf(s, #call ": " print);                    \
 268         put_cpu();                                                      \
 269         if (!ret)                                                       \
 270                 return TRACE_TYPE_PARTIAL_LINE;                         \
 271                                                                         \
 272         return TRACE_TYPE_HANDLED;                                      \
 273 }
 274
 275 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 276
 277 #undef __field_ext
 278 #define __field_ext(type, item, filter_type)                            \
 279         ret = trace_define_field(event_call, #type, #item,              \
 280                                  offsetof(typeof(field), item),         \
 281                                  sizeof(field.item),                    \
 282                                  is_signed_type(type), filter_type);    \
 283         if (ret)                                                        \
 284                 return ret;
 285
 286 #undef __field
 287 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 288
 289 #undef __array
 290 #define __array(type, item, len)                                        \
 291         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 292         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 293                                  offsetof(typeof(field), item),         \
 294                                  sizeof(field.item), 0, 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), 0,           \
 303                                  FILTER_OTHER);
 304
 305 #undef __string
 306 #define __string(item, src) __dynamic_array(char, item, -1)
 307
 308 #undef TRACE_EVENT
 309 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
 310 int                                                                     \
 311 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 312 {                                                                       \
 313         struct ftrace_raw_##call field;                                 \
 314         int ret;                                                        \
 315                                                                         \
 316         ret = trace_define_common_fields(event_call);                   \
 317         if (ret)                                                        \
 318                 return ret;                                             \
 319                                                                         \
 320         tstruct;                                                        \
 321                                                                         \
 322         return ret;                                                     \
 323 }
 324
 325 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 326
 327 /*
 328  * remember the offset of each array from the beginning of the event.
 329  */
 330
 331 #undef __entry
 332 #define __entry entry
 333
 334 #undef __field
 335 #define __field(type, item)
 336
 337 #undef __field_ext
 338 #define __field_ext(type, item, filter_type)
 339
 340 #undef __array
 341 #define __array(type, item, len)
 342
 343 #undef __dynamic_array
 344 #define __dynamic_array(type, item, len)                                \
 345         __data_offsets->item = __data_size +                            \
 346                                offsetof(typeof(*entry), __data);        \
 347         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 348         __data_size += (len) * sizeof(type);
 349
 350 #undef __string
 351 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)       \
 352
 353 #undef TRACE_EVENT
 354 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 355 static inline int ftrace_get_offsets_##call(                            \
 356         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 357 {                                                                       \
 358         int __data_size = 0;                                            \
 359         struct ftrace_raw_##call __maybe_unused *entry;                 \
 360                                                                         \
 361         tstruct;                                                        \
 362                                                                         \
 363         return __data_size;                                             \
 364 }
 365
 366 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 367
 368 #ifdef CONFIG_EVENT_PROFILE
 369
 370 /*
 371  * Generate the functions needed for tracepoint perf_counter support.
 372  *
 373  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
 374  *
 375  * static int ftrace_profile_enable_<call>(struct ftrace_event_call *event_call)
 376  * {
 377  *      int ret = 0;
 378  *
 379  *      if (!atomic_inc_return(&event_call->profile_count))
 380  *              ret = register_trace_<call>(ftrace_profile_<call>);
 381  *
 382  *      return ret;
 383  * }
 384  *
 385  * static void ftrace_profile_disable_<call>(struct ftrace_event_call *event_call)
 386  * {
 387  *      if (atomic_add_negative(-1, &event->call->profile_count))
 388  *              unregister_trace_<call>(ftrace_profile_<call>);
 389  * }
 390  *
 391  */
 392
 393 #undef TRACE_EVENT
 394 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 395                                                                         \
 396 static void ftrace_profile_##call(proto);                               \
 397                                                                         \
 398 static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
 399 {                                                                       \
 400         int ret = 0;                                                    \
 401                                                                         \
 402         if (!atomic_inc_return(&event_call->profile_count))             \
 403                 ret = register_trace_##call(ftrace_profile_##call);     \
 404                                                                         \
 405         return ret;                                                     \
 406 }                                                                       \
 407                                                                         \
 408 static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
 409 {                                                                       \
 410         if (atomic_add_negative(-1, &event_call->profile_count))        \
 411                 unregister_trace_##call(ftrace_profile_##call);         \
 412 }
 413
 414 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 415
 416 #endif
 417
 418 /*
 419  * Stage 4 of the trace events.
 420  *
 421  * Override the macros in <trace/trace_events.h> to include the following:
 422  *
 423  * static void ftrace_event_<call>(proto)
 424  * {
 425  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
 426  * }
 427  *
 428  * static int ftrace_reg_event_<call>(void)
 429  * {
 430  *      int ret;
 431  *
 432  *      ret = register_trace_<call>(ftrace_event_<call>);
 433  *      if (!ret)
 434  *              pr_info("event trace: Could not activate trace point "
 435  *                      "probe to  <call>");
 436  *      return ret;
 437  * }
 438  *
 439  * static void ftrace_unreg_event_<call>(void)
 440  * {
 441  *      unregister_trace_<call>(ftrace_event_<call>);
 442  * }
 443  *
 444  *
 445  * For those macros defined with TRACE_EVENT:
 446  *
 447  * static struct ftrace_event_call event_<call>;
 448  *
 449  * static void ftrace_raw_event_<call>(proto)
 450  * {
 451  *      struct ring_buffer_event *event;
 452  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 453  *      unsigned long irq_flags;
 454  *      int pc;
 455  *
 456  *      local_save_flags(irq_flags);
 457  *      pc = preempt_count();
 458  *
 459  *      event = trace_current_buffer_lock_reserve(event_<call>.id,
 460  *                                sizeof(struct ftrace_raw_<call>),
 461  *                                irq_flags, pc);
 462  *      if (!event)
 463  *              return;
 464  *      entry   = ring_buffer_event_data(event);
 465  *
 466  *      <assign>;  <-- Here we assign the entries by the __field and
 467  *                      __array macros.
 468  *
 469  *      trace_current_buffer_unlock_commit(event, irq_flags, pc);
 470  * }
 471  *
 472  * static int ftrace_raw_reg_event_<call>(void)
 473  * {
 474  *      int ret;
 475  *
 476  *      ret = register_trace_<call>(ftrace_raw_event_<call>);
 477  *      if (!ret)
 478  *              pr_info("event trace: Could not activate trace point "
 479  *                      "probe to <call>");
 480  *      return ret;
 481  * }
 482  *
 483  * static void ftrace_unreg_event_<call>(void)
 484  * {
 485  *      unregister_trace_<call>(ftrace_raw_event_<call>);
 486  * }
 487  *
 488  * static struct trace_event ftrace_event_type_<call> = {
 489  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 490  * };
 491  *
 492  * static int ftrace_raw_init_event_<call>(void)
 493  * {
 494  *      int id;
 495  *
 496  *      id = register_ftrace_event(&ftrace_event_type_<call>);
 497  *      if (!id)
 498  *              return -ENODEV;
 499  *      event_<call>.id = id;
 500  *      return 0;
 501  * }
 502  *
 503  * static struct ftrace_event_call __used
 504  * __attribute__((__aligned__(4)))
 505  * __attribute__((section("_ftrace_events"))) event_<call> = {
 506  *      .name                   = "<call>",
 507  *      .system                 = "<system>",
 508  *      .raw_init               = ftrace_raw_init_event_<call>,
 509  *      .regfunc                = ftrace_reg_event_<call>,
 510  *      .unregfunc              = ftrace_unreg_event_<call>,
 511  *      .show_format            = ftrace_format_<call>,
 512  * }
 513  *
 514  */
 515
 516 #undef TP_FMT
 517 #define TP_FMT(fmt, args...)    fmt "\n", ##args
 518
 519 #ifdef CONFIG_EVENT_PROFILE
 520
 521 #define _TRACE_PROFILE_INIT(call)                                       \
 522         .profile_count = ATOMIC_INIT(-1),                               \
 523         .profile_enable = ftrace_profile_enable_##call,                 \
 524         .profile_disable = ftrace_profile_disable_##call,
 525
 526 #else
 527 #define _TRACE_PROFILE_INIT(call)
 528 #endif
 529
 530 #undef __entry
 531 #define __entry entry
 532
 533 #undef __field
 534 #define __field(type, item)
 535
 536 #undef __array
 537 #define __array(type, item, len)
 538
 539 #undef __dynamic_array
 540 #define __dynamic_array(type, item, len)                                \
 541         __entry->__data_loc_##item = __data_offsets.item;
 542
 543 #undef __string
 544 #define __string(item, src) __dynamic_array(char, item, -1)             \
 545
 546 #undef __assign_str
 547 #define __assign_str(dst, src)                                          \
 548         strcpy(__get_str(dst), src);
 549
 550 #undef TRACE_EVENT
 551 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 552                                                                         \
 553 static struct ftrace_event_call event_##call;                           \
 554                                                                         \
 555 static void ftrace_raw_event_##call(proto)                              \
 556 {                                                                       \
 557         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 558         struct ftrace_event_call *event_call = &event_##call;           \
 559         struct ring_buffer_event *event;                                \
 560         struct ftrace_raw_##call *entry;                                \
 561         unsigned long irq_flags;                                        \
 562         int __data_size;                                                \
 563         int pc;                                                         \
 564                                                                         \
 565         local_save_flags(irq_flags);                                    \
 566         pc = preempt_count();                                           \
 567                                                                         \
 568         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 569                                                                         \
 570         event = trace_current_buffer_lock_reserve(event_##call.id,      \
 571                                  sizeof(*entry) + __data_size,          \
 572                                  irq_flags, pc);                        \
 573         if (!event)                                                     \
 574                 return;                                                 \
 575         entry   = ring_buffer_event_data(event);                        \
 576                                                                         \
 577                                                                         \
 578         tstruct                                                         \
 579                                                                         \
 580         { assign; }                                                     \
 581                                                                         \
 582         if (!filter_current_check_discard(event_call, entry, event))    \
 583                 trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
 584 }                                                                       \
 585                                                                         \
 586 static int ftrace_raw_reg_event_##call(void *ptr)                       \
 587 {                                                                       \
 588         int ret;                                                        \
 589                                                                         \
 590         ret = register_trace_##call(ftrace_raw_event_##call);           \
 591         if (ret)                                                        \
 592                 pr_info("event trace: Could not activate trace point "  \
 593                         "probe to " #call "\n");                        \
 594         return ret;                                                     \
 595 }                                                                       \
 596                                                                         \
 597 static void ftrace_raw_unreg_event_##call(void *ptr)                    \
 598 {                                                                       \
 599         unregister_trace_##call(ftrace_raw_event_##call);               \
 600 }                                                                       \
 601                                                                         \
 602 static struct trace_event ftrace_event_type_##call = {                  \
 603         .trace                  = ftrace_raw_output_##call,             \
 604 };                                                                      \
 605                                                                         \
 606 static int ftrace_raw_init_event_##call(void)                           \
 607 {                                                                       \
 608         int id;                                                         \
 609                                                                         \
 610         id = register_ftrace_event(&ftrace_event_type_##call);          \
 611         if (!id)                                                        \
 612                 return -ENODEV;                                         \
 613         event_##call.id = id;                                           \
 614         INIT_LIST_HEAD(&event_##call.fields);                           \
 615         init_preds(&event_##call);                                      \
 616         return 0;                                                       \
 617 }                                                                       \
 618                                                                         \
 619 static struct ftrace_event_call __used                                  \
 620 __attribute__((__aligned__(4)))                                         \
 621 __attribute__((section("_ftrace_events"))) event_##call = {             \
 622         .name                   = #call,                                \
 623         .system                 = __stringify(TRACE_SYSTEM),            \
 624         .event                  = &ftrace_event_type_##call,            \
 625         .raw_init               = ftrace_raw_init_event_##call,         \
 626         .regfunc                = ftrace_raw_reg_event_##call,          \
 627         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 628         .show_format            = ftrace_format_##call,                 \
 629         .define_fields          = ftrace_define_fields_##call,          \
 630         _TRACE_PROFILE_INIT(call)                                       \
 631 }
 632
 633 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 634
 635 /*
 636  * Define the insertion callback to profile events
 637  *
 638  * The job is very similar to ftrace_raw_event_<call> except that we don't
 639  * insert in the ring buffer but in a perf counter.
 640  *
 641  * static void ftrace_profile_<call>(proto)
 642  * {
 643  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 644  *      struct ftrace_event_call *event_call = &event_<call>;
 645  *      extern void perf_tpcounter_event(int, u64, u64, void *, int);
 646  *      struct ftrace_raw_##call *entry;
 647  *      u64 __addr = 0, __count = 1;
 648  *      unsigned long irq_flags;
 649  *      int __entry_size;
 650  *      int __data_size;
 651  *      int pc;
 652  *
 653  *      local_save_flags(irq_flags);
 654  *      pc = preempt_count();
 655  *
 656  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 657  *
 658  *      // Below we want to get the aligned size by taking into account
 659  *      // the u32 field that will later store the buffer size
 660  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 661  *                           sizeof(u64));
 662  *      __entry_size -= sizeof(u32);
 663  *
 664  *      do {
 665  *              char raw_data[__entry_size]; <- allocate our sample in the stack
 666  *              struct trace_entry *ent;
 667  *
 668  *              zero dead bytes from alignment to avoid stack leak to userspace:
 669  *
 670  *              *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 671  *              entry = (struct ftrace_raw_<call> *)raw_data;
 672  *              ent = &entry->ent;
 673  *              tracing_generic_entry_update(ent, irq_flags, pc);
 674  *              ent->type = event_call->id;
 675  *
 676  *              <tstruct> <- do some jobs with dynamic arrays
 677  *
 678  *              <assign>  <- affect our values
 679  *
 680  *              perf_tpcounter_event(event_call->id, __addr, __count, entry,
 681  *                           __entry_size);  <- submit them to perf counter
 682  *      } while (0);
 683  *
 684  * }
 685  */
 686
 687 #ifdef CONFIG_EVENT_PROFILE
 688
 689 #undef __perf_addr
 690 #define __perf_addr(a) __addr = (a)
 691
 692 #undef __perf_count
 693 #define __perf_count(c) __count = (c)
 694
 695 #undef TRACE_EVENT
 696 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 697 static void ftrace_profile_##call(proto)                                \
 698 {                                                                       \
 699         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 700         struct ftrace_event_call *event_call = &event_##call;           \
 701         extern void perf_tpcounter_event(int, u64, u64, void *, int);   \
 702         struct ftrace_raw_##call *entry;                                \
 703         u64 __addr = 0, __count = 1;                                    \
 704         unsigned long irq_flags;                                        \
 705         int __entry_size;                                               \
 706         int __data_size;                                                \
 707         int pc;                                                         \
 708                                                                         \
 709         local_save_flags(irq_flags);                                    \
 710         pc = preempt_count();                                           \
 711                                                                         \
 712         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 713         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 714                              sizeof(u64));                              \
 715         __entry_size -= sizeof(u32);                                    \
 716                                                                         \
 717         do {                                                            \
 718                 char raw_data[__entry_size];                            \
 719                 struct trace_entry *ent;                                \
 720                                                                         \
 721                 *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
 722                 entry = (struct ftrace_raw_##call *)raw_data;           \
 723                 ent = &entry->ent;                                      \
 724                 tracing_generic_entry_update(ent, irq_flags, pc);       \
 725                 ent->type = event_call->id;                             \
 726                                                                         \
 727                 tstruct                                                 \
 728                                                                         \
 729                 { assign; }                                             \
 730                                                                         \
 731                 perf_tpcounter_event(event_call->id, __addr, __count, entry,\
 732                              __entry_size);                             \
 733         } while (0);                                                    \
 734                                                                         \
 735 }
 736
 737 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 738 #endif /* CONFIG_EVENT_PROFILE */
 739
 740 #undef _TRACE_PROFILE_INIT
 741