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