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