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 /* Callbacks are meaningless to ftrace. */
  46 #undef TRACE_EVENT_FN
  47 #define TRACE_EVENT_FN(name, proto, args, tstruct,              \
  48                 assign, print, reg, unreg)                      \
  49         TRACE_EVENT(name, TP_PROTO(proto), TP_ARGS(args),       \
  50                 TP_STRUCT__entry(tstruct),                      \
  51                 TP_fast_assign(assign),                         \
  52                 TP_printk(print))
  53
  54 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  55
  56
  57 /*
  58  * Stage 2 of the trace events.
  59  *
  60  * Include the following:
  61  *
  62  * struct ftrace_data_offsets_<call> {
  63  *      u32                             <item1>;
  64  *      u32                             <item2>;
  65  *      [...]
  66  * };
  67  *
  68  * The __dynamic_array() macro will create each u32 <item>, this is
  69  * to keep the offset of each array from the beginning of the event.
  70  * The size of an array is also encoded, in the higher 16 bits of <item>.
  71  */
  72
  73 #undef __field
  74 #define __field(type, item);
  75
  76 #undef __array
  77 #define __array(type, item, len)
  78
  79 #undef __dynamic_array
  80 #define __dynamic_array(type, item, len)        u32 item;
  81
  82 #undef __string
  83 #define __string(item, src) __dynamic_array(char, item, -1)
  84
  85 #undef TRACE_EVENT
  86 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
  87         struct ftrace_data_offsets_##call {                             \
  88                 tstruct;                                                \
  89         };
  90
  91 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  92
  93 /*
  94  * Setup the showing format of trace point.
  95  *
  96  * int
  97  * ftrace_format_##call(struct trace_seq *s)
  98  * {
  99  *      struct ftrace_raw_##call field;
 100  *      int ret;
 101  *
 102  *      ret = trace_seq_printf(s, #type " " #item ";"
 103  *                             " offset:%u; size:%u;\n",
 104  *                             offsetof(struct ftrace_raw_##call, item),
 105  *                             sizeof(field.type));
 106  *
 107  * }
 108  */
 109
 110 #undef TP_STRUCT__entry
 111 #define TP_STRUCT__entry(args...) args
 112
 113 #undef __field
 114 #define __field(type, item)                                     \
 115         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\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 __array
 123 #define __array(type, item, len)                                                \
 124         ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
 125                                "offset:%u;\tsize:%u;\n",                \
 126                                (unsigned int)offsetof(typeof(field), item), \
 127                                (unsigned int)sizeof(field.item));       \
 128         if (!ret)                                                       \
 129                 return 0;
 130
 131 #undef __dynamic_array
 132 #define __dynamic_array(type, item, len)                                       \
 133         ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
 134                                "offset:%u;\tsize:%u;\n",                       \
 135                                (unsigned int)offsetof(typeof(field),           \
 136                                         __data_loc_##item),                    \
 137                                (unsigned int)sizeof(field.__data_loc_##item)); \
 138         if (!ret)                                                              \
 139                 return 0;
 140
 141 #undef __string
 142 #define __string(item, src) __dynamic_array(char, item, -1)
 143
 144 #undef __entry
 145 #define __entry REC
 146
 147 #undef __print_symbolic
 148 #undef __get_dynamic_array
 149 #undef __get_str
 150
 151 #undef TP_printk
 152 #define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
 153
 154 #undef TP_fast_assign
 155 #define TP_fast_assign(args...) args
 156
 157 #undef TP_perf_assign
 158 #define TP_perf_assign(args...)
 159
 160 #undef TRACE_EVENT
 161 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
 162 static int                                                              \
 163 ftrace_format_##call(struct ftrace_event_call *unused,                  \
 164                       struct trace_seq *s)                              \
 165 {                                                                       \
 166         struct ftrace_raw_##call field __attribute__((unused));         \
 167         int ret = 0;                                                    \
 168                                                                         \
 169         tstruct;                                                        \
 170                                                                         \
 171         trace_seq_printf(s, "\nprint fmt: " print);                     \
 172                                                                         \
 173         return ret;                                                     \
 174 }
 175
 176 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 177
 178 /*
 179  * Stage 3 of the trace events.
 180  *
 181  * Override the macros in <trace/trace_events.h> to include the following:
 182  *
 183  * enum print_line_t
 184  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 185  * {
 186  *      struct trace_seq *s = &iter->seq;
 187  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 188  *      struct trace_entry *entry;
 189  *      struct trace_seq *p;
 190  *      int ret;
 191  *
 192  *      entry = iter->ent;
 193  *
 194  *      if (entry->type != event_<call>.id) {
 195  *              WARN_ON_ONCE(1);
 196  *              return TRACE_TYPE_UNHANDLED;
 197  *      }
 198  *
 199  *      field = (typeof(field))entry;
 200  *
 201  *      p = get_cpu_var(ftrace_event_seq);
 202  *      trace_seq_init(p);
 203  *      ret = trace_seq_printf(s, <TP_printk> "\n");
 204  *      put_cpu();
 205  *      if (!ret)
 206  *              return TRACE_TYPE_PARTIAL_LINE;
 207  *
 208  *      return TRACE_TYPE_HANDLED;
 209  * }
 210  *
 211  * This is the method used to print the raw event to the trace
 212  * output format. Note, this is not needed if the data is read
 213  * in binary.
 214  */
 215
 216 #undef __entry
 217 #define __entry field
 218
 219 #undef TP_printk
 220 #define TP_printk(fmt, args...) fmt "\n", args
 221
 222 #undef __get_dynamic_array
 223 #define __get_dynamic_array(field)      \
 224                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 225
 226 #undef __get_str
 227 #define __get_str(field) (char *)__get_dynamic_array(field)
 228
 229 #undef __print_flags
 230 #define __print_flags(flag, delim, flag_array...)                       \
 231         ({                                                              \
 232                 static const struct trace_print_flags flags[] =         \
 233                         { flag_array, { -1, NULL }};                    \
 234                 ftrace_print_flags_seq(p, delim, flag, flags);          \
 235         })
 236
 237 #undef __print_symbolic
 238 #define __print_symbolic(value, symbol_array...)                        \
 239         ({                                                              \
 240                 static const struct trace_print_flags symbols[] =       \
 241                         { symbol_array, { -1, NULL }};                  \
 242                 ftrace_print_symbols_seq(p, value, symbols);            \
 243         })
 244
 245 #undef TRACE_EVENT
 246 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 247 enum print_line_t                                                       \
 248 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
 249 {                                                                       \
 250         struct trace_seq *s = &iter->seq;                               \
 251         struct ftrace_raw_##call *field;                                \
 252         struct trace_entry *entry;                                      \
 253         struct trace_seq *p;                                            \
 254         int ret;                                                        \
 255                                                                         \
 256         entry = iter->ent;                                              \
 257                                                                         \
 258         if (entry->type != event_##call.id) {                           \
 259                 WARN_ON_ONCE(1);                                        \
 260                 return TRACE_TYPE_UNHANDLED;                            \
 261         }                                                               \
 262                                                                         \
 263         field = (typeof(field))entry;                                   \
 264                                                                         \
 265         p = &get_cpu_var(ftrace_event_seq);                             \
 266         trace_seq_init(p);                                              \
 267         ret = trace_seq_printf(s, #call ": " print);                    \
 268         put_cpu();                                                      \
 269         if (!ret)                                                       \
 270                 return TRACE_TYPE_PARTIAL_LINE;                         \
 271                                                                         \
 272         return TRACE_TYPE_HANDLED;                                      \
 273 }
 274
 275 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 276
 277 #undef __field
 278 #define __field(type, item)                                             \
 279         ret = trace_define_field(event_call, #type, #item,              \
 280                                  offsetof(typeof(field), item),         \
 281                                  sizeof(field.item), is_signed_type(type));     \
 282         if (ret)                                                        \
 283                 return ret;
 284
 285 #undef __array
 286 #define __array(type, item, len)                                        \
 287         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 288         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 289                                  offsetof(typeof(field), item),         \
 290                                  sizeof(field.item), 0);                \
 291         if (ret)                                                        \
 292                 return ret;
 293
 294 #undef __dynamic_array
 295 #define __dynamic_array(type, item, len)                                       \
 296         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 297                                 offsetof(typeof(field), __data_loc_##item),    \
 298                                  sizeof(field.__data_loc_##item), 0);
 299
 300 #undef __string
 301 #define __string(item, src) __dynamic_array(char, item, -1)
 302
 303 #undef TRACE_EVENT
 304 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
 305 int                                                                     \
 306 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 307 {                                                                       \
 308         struct ftrace_raw_##call field;                                 \
 309         int ret;                                                        \
 310                                                                         \
 311         ret = trace_define_common_fields(event_call);                   \
 312         if (ret)                                                        \
 313                 return ret;                                             \
 314                                                                         \
 315         tstruct;                                                        \
 316                                                                         \
 317         return ret;                                                     \
 318 }
 319
 320 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 321
 322 /*
 323  * remember the offset of each array from the beginning of the event.
 324  */
 325
 326 #undef __entry
 327 #define __entry entry
 328
 329 #undef __field
 330 #define __field(type, item)
 331
 332 #undef __array
 333 #define __array(type, item, len)
 334
 335 #undef __dynamic_array
 336 #define __dynamic_array(type, item, len)                                \
 337         __data_offsets->item = __data_size +                            \
 338                                offsetof(typeof(*entry), __data);        \
 339         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 340         __data_size += (len) * sizeof(type);
 341
 342 #undef __string
 343 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)       \
 344
 345 #undef TRACE_EVENT
 346 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 347 static inline int ftrace_get_offsets_##call(                            \
 348         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 349 {                                                                       \
 350         int __data_size = 0;                                            \
 351         struct ftrace_raw_##call __maybe_unused *entry;                 \
 352                                                                         \
 353         tstruct;                                                        \
 354                                                                         \
 355         return __data_size;                                             \
 356 }
 357
 358 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 359
 360 #ifdef CONFIG_EVENT_PROFILE
 361
 362 /*
 363  * Generate the functions needed for tracepoint perf_counter support.
 364  *
 365  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
 366  *
 367  * static int ftrace_profile_enable_<call>(struct ftrace_event_call *event_call)
 368  * {
 369  *      int ret = 0;
 370  *
 371  *      if (!atomic_inc_return(&event_call->profile_count))
 372  *              ret = register_trace_<call>(ftrace_profile_<call>);
 373  *
 374  *      return ret;
 375  * }
 376  *
 377  * static void ftrace_profile_disable_<call>(struct ftrace_event_call *event_call)
 378  * {
 379  *      if (atomic_add_negative(-1, &event->call->profile_count))
 380  *              unregister_trace_<call>(ftrace_profile_<call>);
 381  * }
 382  *
 383  */
 384
 385 #undef TRACE_EVENT
 386 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 387                                                                         \
 388 static void ftrace_profile_##call(proto);                               \
 389                                                                         \
 390 static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
 391 {                                                                       \
 392         int ret = 0;                                                    \
 393                                                                         \
 394         if (!atomic_inc_return(&event_call->profile_count))             \
 395                 ret = register_trace_##call(ftrace_profile_##call);     \
 396                                                                         \
 397         return ret;                                                     \
 398 }                                                                       \
 399                                                                         \
 400 static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
 401 {                                                                       \
 402         if (atomic_add_negative(-1, &event_call->profile_count))        \
 403                 unregister_trace_##call(ftrace_profile_##call);         \
 404 }
 405
 406 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 407
 408 #endif
 409
 410 /*
 411  * Stage 4 of the trace events.
 412  *
 413  * Override the macros in <trace/trace_events.h> to include the following:
 414  *
 415  * static void ftrace_event_<call>(proto)
 416  * {
 417  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
 418  * }
 419  *
 420  * static int ftrace_reg_event_<call>(void)
 421  * {
 422  *      int ret;
 423  *
 424  *      ret = register_trace_<call>(ftrace_event_<call>);
 425  *      if (!ret)
 426  *              pr_info("event trace: Could not activate trace point "
 427  *                      "probe to  <call>");
 428  *      return ret;
 429  * }
 430  *
 431  * static void ftrace_unreg_event_<call>(void)
 432  * {
 433  *      unregister_trace_<call>(ftrace_event_<call>);
 434  * }
 435  *
 436  *
 437  * For those macros defined with TRACE_EVENT:
 438  *
 439  * static struct ftrace_event_call event_<call>;
 440  *
 441  * static void ftrace_raw_event_<call>(proto)
 442  * {
 443  *      struct ring_buffer_event *event;
 444  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 445  *      unsigned long irq_flags;
 446  *      int pc;
 447  *
 448  *      local_save_flags(irq_flags);
 449  *      pc = preempt_count();
 450  *
 451  *      event = trace_current_buffer_lock_reserve(event_<call>.id,
 452  *                                sizeof(struct ftrace_raw_<call>),
 453  *                                irq_flags, pc);
 454  *      if (!event)
 455  *              return;
 456  *      entry   = ring_buffer_event_data(event);
 457  *
 458  *      <assign>;  <-- Here we assign the entries by the __field and
 459  *                      __array macros.
 460  *
 461  *      trace_current_buffer_unlock_commit(event, irq_flags, pc);
 462  * }
 463  *
 464  * static int ftrace_raw_reg_event_<call>(void)
 465  * {
 466  *      int ret;
 467  *
 468  *      ret = register_trace_<call>(ftrace_raw_event_<call>);
 469  *      if (!ret)
 470  *              pr_info("event trace: Could not activate trace point "
 471  *                      "probe to <call>");
 472  *      return ret;
 473  * }
 474  *
 475  * static void ftrace_unreg_event_<call>(void)
 476  * {
 477  *      unregister_trace_<call>(ftrace_raw_event_<call>);
 478  * }
 479  *
 480  * static struct trace_event ftrace_event_type_<call> = {
 481  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 482  * };
 483  *
 484  * static int ftrace_raw_init_event_<call>(void)
 485  * {
 486  *      int id;
 487  *
 488  *      id = register_ftrace_event(&ftrace_event_type_<call>);
 489  *      if (!id)
 490  *              return -ENODEV;
 491  *      event_<call>.id = id;
 492  *      return 0;
 493  * }
 494  *
 495  * static struct ftrace_event_call __used
 496  * __attribute__((__aligned__(4)))
 497  * __attribute__((section("_ftrace_events"))) event_<call> = {
 498  *      .name                   = "<call>",
 499  *      .system                 = "<system>",
 500  *      .raw_init               = ftrace_raw_init_event_<call>,
 501  *      .regfunc                = ftrace_reg_event_<call>,
 502  *      .unregfunc              = ftrace_unreg_event_<call>,
 503  *      .show_format            = ftrace_format_<call>,
 504  * }
 505  *
 506  */
 507
 508 #undef TP_FMT
 509 #define TP_FMT(fmt, args...)    fmt "\n", ##args
 510
 511 #ifdef CONFIG_EVENT_PROFILE
 512
 513 #define _TRACE_PROFILE_INIT(call)                                       \
 514         .profile_count = ATOMIC_INIT(-1),                               \
 515         .profile_enable = ftrace_profile_enable_##call,                 \
 516         .profile_disable = ftrace_profile_disable_##call,
 517
 518 #else
 519 #define _TRACE_PROFILE_INIT(call)
 520 #endif
 521
 522 #undef __entry
 523 #define __entry entry
 524
 525 #undef __field
 526 #define __field(type, item)
 527
 528 #undef __array
 529 #define __array(type, item, len)
 530
 531 #undef __dynamic_array
 532 #define __dynamic_array(type, item, len)                                \
 533         __entry->__data_loc_##item = __data_offsets.item;
 534
 535 #undef __string
 536 #define __string(item, src) __dynamic_array(char, item, -1)             \
 537
 538 #undef __assign_str
 539 #define __assign_str(dst, src)                                          \
 540         strcpy(__get_str(dst), src);
 541
 542 #undef TRACE_EVENT
 543 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 544                                                                         \
 545 static struct ftrace_event_call event_##call;                           \
 546                                                                         \
 547 static void ftrace_raw_event_##call(proto)                              \
 548 {                                                                       \
 549         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 550         struct ftrace_event_call *event_call = &event_##call;           \
 551         struct ring_buffer_event *event;                                \
 552         struct ftrace_raw_##call *entry;                                \
 553         unsigned long irq_flags;                                        \
 554         int __data_size;                                                \
 555         int pc;                                                         \
 556                                                                         \
 557         local_save_flags(irq_flags);                                    \
 558         pc = preempt_count();                                           \
 559                                                                         \
 560         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 561                                                                         \
 562         event = trace_current_buffer_lock_reserve(event_##call.id,      \
 563                                  sizeof(*entry) + __data_size,          \
 564                                  irq_flags, pc);                        \
 565         if (!event)                                                     \
 566                 return;                                                 \
 567         entry   = ring_buffer_event_data(event);                        \
 568                                                                         \
 569                                                                         \
 570         tstruct                                                         \
 571                                                                         \
 572         { assign; }                                                     \
 573                                                                         \
 574         if (!filter_current_check_discard(event_call, entry, event))    \
 575                 trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \
 576 }                                                                       \
 577                                                                         \
 578 static int ftrace_raw_reg_event_##call(void *ptr)                       \
 579 {                                                                       \
 580         int ret;                                                        \
 581                                                                         \
 582         ret = register_trace_##call(ftrace_raw_event_##call);           \
 583         if (ret)                                                        \
 584                 pr_info("event trace: Could not activate trace point "  \
 585                         "probe to " #call "\n");                        \
 586         return ret;                                                     \
 587 }                                                                       \
 588                                                                         \
 589 static void ftrace_raw_unreg_event_##call(void *ptr)                    \
 590 {                                                                       \
 591         unregister_trace_##call(ftrace_raw_event_##call);               \
 592 }                                                                       \
 593                                                                         \
 594 static struct trace_event ftrace_event_type_##call = {                  \
 595         .trace                  = ftrace_raw_output_##call,             \
 596 };                                                                      \
 597                                                                         \
 598 static int ftrace_raw_init_event_##call(void)                           \
 599 {                                                                       \
 600         int id;                                                         \
 601                                                                         \
 602         id = register_ftrace_event(&ftrace_event_type_##call);          \
 603         if (!id)                                                        \
 604                 return -ENODEV;                                         \
 605         event_##call.id = id;                                           \
 606         INIT_LIST_HEAD(&event_##call.fields);                           \
 607         init_preds(&event_##call);                                      \
 608         return 0;                                                       \
 609 }                                                                       \
 610                                                                         \
 611 static struct ftrace_event_call __used                                  \
 612 __attribute__((__aligned__(4)))                                         \
 613 __attribute__((section("_ftrace_events"))) event_##call = {             \
 614         .name                   = #call,                                \
 615         .system                 = __stringify(TRACE_SYSTEM),            \
 616         .event                  = &ftrace_event_type_##call,            \
 617         .raw_init               = ftrace_raw_init_event_##call,         \
 618         .regfunc                = ftrace_raw_reg_event_##call,          \
 619         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 620         .show_format            = ftrace_format_##call,                 \
 621         .define_fields          = ftrace_define_fields_##call,          \
 622         _TRACE_PROFILE_INIT(call)                                       \
 623 }
 624
 625 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 626
 627 /*
 628  * Define the insertion callback to profile events
 629  *
 630  * The job is very similar to ftrace_raw_event_<call> except that we don't
 631  * insert in the ring buffer but in a perf counter.
 632  *
 633  * static void ftrace_profile_<call>(proto)
 634  * {
 635  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 636  *      struct ftrace_event_call *event_call = &event_<call>;
 637  *      extern void perf_tpcounter_event(int, u64, u64, void *, int);
 638  *      struct ftrace_raw_##call *entry;
 639  *      u64 __addr = 0, __count = 1;
 640  *      unsigned long irq_flags;
 641  *      int __entry_size;
 642  *      int __data_size;
 643  *      int pc;
 644  *
 645  *      local_save_flags(irq_flags);
 646  *      pc = preempt_count();
 647  *
 648  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 649  *
 650  *      // Below we want to get the aligned size by taking into account
 651  *      // the u32 field that will later store the buffer size
 652  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 653  *                           sizeof(u64));
 654  *      __entry_size -= sizeof(u32);
 655  *
 656  *      do {
 657  *              char raw_data[__entry_size]; <- allocate our sample in the stack
 658  *              struct trace_entry *ent;
 659  *
 660  *              zero dead bytes from alignment to avoid stack leak to userspace:
 661  *
 662  *              *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 663  *              entry = (struct ftrace_raw_<call> *)raw_data;
 664  *              ent = &entry->ent;
 665  *              tracing_generic_entry_update(ent, irq_flags, pc);
 666  *              ent->type = event_call->id;
 667  *
 668  *              <tstruct> <- do some jobs with dynamic arrays
 669  *
 670  *              <assign>  <- affect our values
 671  *
 672  *              perf_tpcounter_event(event_call->id, __addr, __count, entry,
 673  *                           __entry_size);  <- submit them to perf counter
 674  *      } while (0);
 675  *
 676  * }
 677  */
 678
 679 #ifdef CONFIG_EVENT_PROFILE
 680
 681 #undef __perf_addr
 682 #define __perf_addr(a) __addr = (a)
 683
 684 #undef __perf_count
 685 #define __perf_count(c) __count = (c)
 686
 687 #undef TRACE_EVENT
 688 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
 689 static void ftrace_profile_##call(proto)                                \
 690 {                                                                       \
 691         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 692         struct ftrace_event_call *event_call = &event_##call;           \
 693         extern void perf_tpcounter_event(int, u64, u64, void *, int);   \
 694         struct ftrace_raw_##call *entry;                                \
 695         u64 __addr = 0, __count = 1;                                    \
 696         unsigned long irq_flags;                                        \
 697         int __entry_size;                                               \
 698         int __data_size;                                                \
 699         int pc;                                                         \
 700                                                                         \
 701         local_save_flags(irq_flags);                                    \
 702         pc = preempt_count();                                           \
 703                                                                         \
 704         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 705         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 706                              sizeof(u64));                              \
 707         __entry_size -= sizeof(u32);                                    \
 708                                                                         \
 709         do {                                                            \
 710                 char raw_data[__entry_size];                            \
 711                 struct trace_entry *ent;                                \
 712                                                                         \
 713                 *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
 714                 entry = (struct ftrace_raw_##call *)raw_data;           \
 715                 ent = &entry->ent;                                      \
 716                 tracing_generic_entry_update(ent, irq_flags, pc);       \
 717                 ent->type = event_call->id;                             \
 718                                                                         \
 719                 tstruct                                                 \
 720                                                                         \
 721                 { assign; }                                             \
 722                                                                         \
 723                 perf_tpcounter_event(event_call->id, __addr, __count, entry,\
 724                              __entry_size);                             \
 725         } while (0);                                                    \
 726                                                                         \
 727 }
 728
 729 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 730 #endif /* CONFIG_EVENT_PROFILE */
 731
 732 #undef _TRACE_PROFILE_INIT
 733