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_event support.
 382  *
 383  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
 384  *
 385  * static int ftrace_profile_enable_<call>(void)
 386  * {
 387  *      return register_trace_<call>(ftrace_profile_<call>);
 388  * }
 389  *
 390  * static void ftrace_profile_disable_<call>(void)
 391  * {
 392  *      unregister_trace_<call>(ftrace_profile_<call>);
 393  * }
 394  *
 395  */
 396
 397 #undef TRACE_EVENT
 398 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 399                                                                         \
 400 static void ftrace_profile_##call(proto);                               \
 401                                                                         \
 402 static int ftrace_profile_enable_##call(void)                           \
 403 {                                                                       \
 404         return register_trace_##call(ftrace_profile_##call);            \
 405 }                                                                       \
 406                                                                         \
 407 static void ftrace_profile_disable_##call(void)                         \
 408 {                                                                       \
 409         unregister_trace_##call(ftrace_profile_##call);                 \
 410 }
 411
 412 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 413
 414 #endif
 415
 416 /*
 417  * Stage 4 of the trace events.
 418  *
 419  * Override the macros in <trace/trace_events.h> to include the following:
 420  *
 421  * static void ftrace_event_<call>(proto)
 422  * {
 423  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
 424  * }
 425  *
 426  * static int ftrace_reg_event_<call>(void)
 427  * {
 428  *      int ret;
 429  *
 430  *      ret = register_trace_<call>(ftrace_event_<call>);
 431  *      if (!ret)
 432  *              pr_info("event trace: Could not activate trace point "
 433  *                      "probe to  <call>");
 434  *      return ret;
 435  * }
 436  *
 437  * static void ftrace_unreg_event_<call>(void)
 438  * {
 439  *      unregister_trace_<call>(ftrace_event_<call>);
 440  * }
 441  *
 442  *
 443  * For those macros defined with TRACE_EVENT:
 444  *
 445  * static struct ftrace_event_call event_<call>;
 446  *
 447  * static void ftrace_raw_event_<call>(proto)
 448  * {
 449  *      struct ring_buffer_event *event;
 450  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 451  *      struct ring_buffer *buffer;
 452  *      unsigned long irq_flags;
 453  *      int pc;
 454  *
 455  *      local_save_flags(irq_flags);
 456  *      pc = preempt_count();
 457  *
 458  *      event = trace_current_buffer_lock_reserve(&buffer,
 459  *                                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(buffer, 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         struct ring_buffer *buffer;                                     \
 562         unsigned long irq_flags;                                        \
 563         int __data_size;                                                \
 564         int pc;                                                         \
 565                                                                         \
 566         local_save_flags(irq_flags);                                    \
 567         pc = preempt_count();                                           \
 568                                                                         \
 569         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 570                                                                         \
 571         event = trace_current_buffer_lock_reserve(&buffer,              \
 572                                  event_##call.id,                       \
 573                                  sizeof(*entry) + __data_size,          \
 574                                  irq_flags, pc);                        \
 575         if (!event)                                                     \
 576                 return;                                                 \
 577         entry   = ring_buffer_event_data(event);                        \
 578                                                                         \
 579                                                                         \
 580         tstruct                                                         \
 581                                                                         \
 582         { assign; }                                                     \
 583                                                                         \
 584         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 585                 trace_nowake_buffer_unlock_commit(buffer,               \
 586                                                   event, irq_flags, pc); \
 587 }                                                                       \
 588                                                                         \
 589 static int ftrace_raw_reg_event_##call(void *ptr)                       \
 590 {                                                                       \
 591         int ret;                                                        \
 592                                                                         \
 593         ret = register_trace_##call(ftrace_raw_event_##call);           \
 594         if (ret)                                                        \
 595                 pr_info("event trace: Could not activate trace point "  \
 596                         "probe to " #call "\n");                        \
 597         return ret;                                                     \
 598 }                                                                       \
 599                                                                         \
 600 static void ftrace_raw_unreg_event_##call(void *ptr)                    \
 601 {                                                                       \
 602         unregister_trace_##call(ftrace_raw_event_##call);               \
 603 }                                                                       \
 604                                                                         \
 605 static struct trace_event ftrace_event_type_##call = {                  \
 606         .trace                  = ftrace_raw_output_##call,             \
 607 };                                                                      \
 608                                                                         \
 609 static int ftrace_raw_init_event_##call(void)                           \
 610 {                                                                       \
 611         int id;                                                         \
 612                                                                         \
 613         id = register_ftrace_event(&ftrace_event_type_##call);          \
 614         if (!id)                                                        \
 615                 return -ENODEV;                                         \
 616         event_##call.id = id;                                           \
 617         INIT_LIST_HEAD(&event_##call.fields);                           \
 618         return 0;                                                       \
 619 }                                                                       \
 620                                                                         \
 621 static struct ftrace_event_call __used                                  \
 622 __attribute__((__aligned__(4)))                                         \
 623 __attribute__((section("_ftrace_events"))) event_##call = {             \
 624         .name                   = #call,                                \
 625         .system                 = __stringify(TRACE_SYSTEM),            \
 626         .event                  = &ftrace_event_type_##call,            \
 627         .raw_init               = ftrace_raw_init_event_##call,         \
 628         .regfunc                = ftrace_raw_reg_event_##call,          \
 629         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 630         .show_format            = ftrace_format_##call,                 \
 631         .define_fields          = ftrace_define_fields_##call,          \
 632         _TRACE_PROFILE_INIT(call)                                       \
 633 }
 634
 635 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 636
 637 /*
 638  * Define the insertion callback to profile events
 639  *
 640  * The job is very similar to ftrace_raw_event_<call> except that we don't
 641  * insert in the ring buffer but in a perf counter.
 642  *
 643  * static void ftrace_profile_<call>(proto)
 644  * {
 645  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 646  *      struct ftrace_event_call *event_call = &event_<call>;
 647  *      extern void perf_tp_event(int, u64, u64, void *, int);
 648  *      struct ftrace_raw_##call *entry;
 649  *      u64 __addr = 0, __count = 1;
 650  *      unsigned long irq_flags;
 651  *      struct trace_entry *ent;
 652  *      int __entry_size;
 653  *      int __data_size;
 654  *      int __cpu
 655  *      int pc;
 656  *
 657  *      pc = preempt_count();
 658  *
 659  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 660  *
 661  *      // Below we want to get the aligned size by taking into account
 662  *      // the u32 field that will later store the buffer size
 663  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 664  *                           sizeof(u64));
 665  *      __entry_size -= sizeof(u32);
 666  *
 667  *      // Protect the non nmi buffer
 668  *      // This also protects the rcu read side
 669  *      local_irq_save(irq_flags);
 670  *      __cpu = smp_processor_id();
 671  *
 672  *      if (in_nmi())
 673  *              raw_data = rcu_dereference(trace_profile_buf_nmi);
 674  *      else
 675  *              raw_data = rcu_dereference(trace_profile_buf);
 676  *
 677  *      if (!raw_data)
 678  *              goto end;
 679  *
 680  *      raw_data = per_cpu_ptr(raw_data, __cpu);
 681  *
 682  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 683  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 684  *      entry = (struct ftrace_raw_<call> *)raw_data;
 685  *      ent = &entry->ent;
 686  *      tracing_generic_entry_update(ent, irq_flags, pc);
 687  *      ent->type = event_call->id;
 688  *
 689  *      <tstruct> <- do some jobs with dynamic arrays
 690  *
 691  *      <assign>  <- affect our values
 692  *
 693  *      perf_tp_event(event_call->id, __addr, __count, entry,
 694  *                   __entry_size);  <- submit them to perf counter
 695  *
 696  * }
 697  */
 698
 699 #ifdef CONFIG_EVENT_PROFILE
 700
 701 #undef __perf_addr
 702 #define __perf_addr(a) __addr = (a)
 703
 704 #undef __perf_count
 705 #define __perf_count(c) __count = (c)
 706
 707 #undef TRACE_EVENT
 708 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 709 static void ftrace_profile_##call(proto)                                \
 710 {                                                                       \
 711         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 712         struct ftrace_event_call *event_call = &event_##call;           \
 713         extern void perf_tp_event(int, u64, u64, void *, int);  \
 714         struct ftrace_raw_##call *entry;                                \
 715         u64 __addr = 0, __count = 1;                                    \
 716         unsigned long irq_flags;                                        \
 717         struct trace_entry *ent;                                        \
 718         int __entry_size;                                               \
 719         int __data_size;                                                \
 720         char *raw_data;                                                 \
 721         int __cpu;                                                      \
 722         int pc;                                                         \
 723                                                                         \
 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         if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE,           \
 732                       "profile buffer not large enough"))               \
 733                 return;                                                 \
 734                                                                         \
 735         local_irq_save(irq_flags);                                      \
 736         __cpu = smp_processor_id();                                     \
 737                                                                         \
 738         if (in_nmi())                                                   \
 739                 raw_data = rcu_dereference(trace_profile_buf_nmi);              \
 740         else                                                            \
 741                 raw_data = rcu_dereference(trace_profile_buf);          \
 742                                                                         \
 743         if (!raw_data)                                                  \
 744                 goto end;                                               \
 745                                                                         \
 746         raw_data = per_cpu_ptr(raw_data, __cpu);                        \
 747                                                                         \
 748         *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;         \
 749         entry = (struct ftrace_raw_##call *)raw_data;                   \
 750         ent = &entry->ent;                                              \
 751         tracing_generic_entry_update(ent, irq_flags, pc);               \
 752         ent->type = event_call->id;                                     \
 753                                                                         \
 754         tstruct                                                         \
 755                                                                         \
 756         { assign; }                                                     \
 757                                                                         \
 758         perf_tp_event(event_call->id, __addr, __count, entry,           \
 759                              __entry_size);                             \
 760                                                                         \
 761 end:                                                                    \
 762         local_irq_restore(irq_flags);                                   \
 763                                                                         \
 764 }
 765
 766 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 767 #endif /* CONFIG_EVENT_PROFILE */
 768
 769 #undef _TRACE_PROFILE_INIT
 770