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 /*
  22  * TRACE_EVENT_TEMPLATE can be used to add a generic function
  23  * handlers for events. That is, if all events have the same
  24  * parameters and just have distinct trace points.
  25  * Each tracepoint can be defined with DEFINE_EVENT and that
  26  * will map the TRACE_EVENT_TEMPLATE to the tracepoint.
  27  *
  28  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  29  */
  30 #undef TRACE_EVENT
  31 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  32         TRACE_EVENT_TEMPLATE(name,                             \
  33                              PARAMS(proto),                    \
  34                              PARAMS(args),                     \
  35                              PARAMS(tstruct),                  \
  36                              PARAMS(assign),                   \
  37                              PARAMS(print));                   \
  38         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  39
  40
  41 #undef __field
  42 #define __field(type, item)             type    item;
  43
  44 #undef __field_ext
  45 #define __field_ext(type, item, filter_type)    type    item;
  46
  47 #undef __array
  48 #define __array(type, item, len)        type    item[len];
  49
  50 #undef __dynamic_array
  51 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
  52
  53 #undef __string
  54 #define __string(item, src) __dynamic_array(char, item, -1)
  55
  56 #undef TP_STRUCT__entry
  57 #define TP_STRUCT__entry(args...) args
  58
  59 #undef TRACE_EVENT_TEMPLATE
  60 #define TRACE_EVENT_TEMPLATE(name, proto, args, tstruct, assign, print) \
  61         struct ftrace_raw_##name {                                      \
  62                 struct trace_entry      ent;                            \
  63                 tstruct                                                 \
  64                 char                    __data[0];                      \
  65         };
  66 #undef DEFINE_EVENT
  67 #define DEFINE_EVENT(template, name, proto, args)       \
  68         static struct ftrace_event_call event_##name
  69
  70 #undef __cpparg
  71 #define __cpparg(arg...) arg
  72
  73 /* Callbacks are meaningless to ftrace. */
  74 #undef TRACE_EVENT_FN
  75 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  76                 assign, print, reg, unreg)                              \
  77         TRACE_EVENT(name, __cpparg(proto), __cpparg(args),              \
  78                 __cpparg(tstruct), __cpparg(assign), __cpparg(print))   \
  79
  80 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  81
  82
  83 /*
  84  * Stage 2 of the trace events.
  85  *
  86  * Include the following:
  87  *
  88  * struct ftrace_data_offsets_<call> {
  89  *      u32                             <item1>;
  90  *      u32                             <item2>;
  91  *      [...]
  92  * };
  93  *
  94  * The __dynamic_array() macro will create each u32 <item>, this is
  95  * to keep the offset of each array from the beginning of the event.
  96  * The size of an array is also encoded, in the higher 16 bits of <item>.
  97  */
  98
  99 #undef __field
 100 #define __field(type, item)
 101
 102 #undef __field_ext
 103 #define __field_ext(type, item, filter_type)
 104
 105 #undef __array
 106 #define __array(type, item, len)
 107
 108 #undef __dynamic_array
 109 #define __dynamic_array(type, item, len)        u32 item;
 110
 111 #undef __string
 112 #define __string(item, src) __dynamic_array(char, item, -1)
 113
 114 #undef TRACE_EVENT_TEMPLATE
 115 #define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
 116         struct ftrace_data_offsets_##call {                             \
 117                 tstruct;                                                \
 118         };
 119
 120 #undef DEFINE_EVENT
 121 #define DEFINE_EVENT(template, name, proto, args)
 122
 123 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 124
 125 /*
 126  * Setup the showing format of trace point.
 127  *
 128  * int
 129  * ftrace_format_##call(struct trace_seq *s)
 130  * {
 131  *      struct ftrace_raw_##call field;
 132  *      int ret;
 133  *
 134  *      ret = trace_seq_printf(s, #type " " #item ";"
 135  *                             " offset:%u; size:%u;\n",
 136  *                             offsetof(struct ftrace_raw_##call, item),
 137  *                             sizeof(field.type));
 138  *
 139  * }
 140  */
 141
 142 #undef TP_STRUCT__entry
 143 #define TP_STRUCT__entry(args...) args
 144
 145 #undef __field
 146 #define __field(type, item)                                     \
 147         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
 148                                "offset:%u;\tsize:%u;\tsigned:%u;\n",    \
 149                                (unsigned int)offsetof(typeof(field), item), \
 150                                (unsigned int)sizeof(field.item),        \
 151                                (unsigned int)is_signed_type(type));     \
 152         if (!ret)                                                       \
 153                 return 0;
 154
 155 #undef __field_ext
 156 #define __field_ext(type, item, filter_type)    __field(type, item)
 157
 158 #undef __array
 159 #define __array(type, item, len)                                                \
 160         ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
 161                                "offset:%u;\tsize:%u;\tsigned:%u;\n",    \
 162                                (unsigned int)offsetof(typeof(field), item), \
 163                                (unsigned int)sizeof(field.item),        \
 164                                (unsigned int)is_signed_type(type));     \
 165         if (!ret)                                                       \
 166                 return 0;
 167
 168 #undef __dynamic_array
 169 #define __dynamic_array(type, item, len)                                       \
 170         ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
 171                                "offset:%u;\tsize:%u;\tsigned:%u;\n",           \
 172                                (unsigned int)offsetof(typeof(field),           \
 173                                         __data_loc_##item),                    \
 174                                (unsigned int)sizeof(field.__data_loc_##item), \
 175                                (unsigned int)is_signed_type(type));     \
 176         if (!ret)                                                              \
 177                 return 0;
 178
 179 #undef __string
 180 #define __string(item, src) __dynamic_array(char, item, -1)
 181
 182 #undef __entry
 183 #define __entry REC
 184
 185 #undef __print_symbolic
 186 #undef __get_dynamic_array
 187 #undef __get_str
 188
 189 #undef TP_printk
 190 #define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
 191
 192 #undef TP_fast_assign
 193 #define TP_fast_assign(args...) args
 194
 195 #undef TP_perf_assign
 196 #define TP_perf_assign(args...)
 197
 198 #undef TRACE_EVENT_TEMPLATE
 199 #define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, func, print)   \
 200 static int                                                              \
 201 ftrace_format_##call(struct ftrace_event_call *unused,                  \
 202                       struct trace_seq *s)                              \
 203 {                                                                       \
 204         struct ftrace_raw_##call field __attribute__((unused));         \
 205         int ret = 0;                                                    \
 206                                                                         \
 207         tstruct;                                                        \
 208                                                                         \
 209         trace_seq_printf(s, "\nprint fmt: " print);                     \
 210                                                                         \
 211         return ret;                                                     \
 212 }
 213
 214 #undef DEFINE_EVENT
 215 #define DEFINE_EVENT(template, name, proto, args)
 216
 217 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 218
 219 /*
 220  * Stage 3 of the trace events.
 221  *
 222  * Override the macros in <trace/trace_events.h> to include the following:
 223  *
 224  * enum print_line_t
 225  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 226  * {
 227  *      struct trace_seq *s = &iter->seq;
 228  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 229  *      struct trace_entry *entry;
 230  *      struct trace_seq *p;
 231  *      int ret;
 232  *
 233  *      entry = iter->ent;
 234  *
 235  *      if (entry->type != event_<call>.id) {
 236  *              WARN_ON_ONCE(1);
 237  *              return TRACE_TYPE_UNHANDLED;
 238  *      }
 239  *
 240  *      field = (typeof(field))entry;
 241  *
 242  *      p = get_cpu_var(ftrace_event_seq);
 243  *      trace_seq_init(p);
 244  *      ret = trace_seq_printf(s, <TP_printk> "\n");
 245  *      put_cpu();
 246  *      if (!ret)
 247  *              return TRACE_TYPE_PARTIAL_LINE;
 248  *
 249  *      return TRACE_TYPE_HANDLED;
 250  * }
 251  *
 252  * This is the method used to print the raw event to the trace
 253  * output format. Note, this is not needed if the data is read
 254  * in binary.
 255  */
 256
 257 #undef __entry
 258 #define __entry field
 259
 260 #undef TP_printk
 261 #define TP_printk(fmt, args...) fmt "\n", args
 262
 263 #undef __get_dynamic_array
 264 #define __get_dynamic_array(field)      \
 265                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 266
 267 #undef __get_str
 268 #define __get_str(field) (char *)__get_dynamic_array(field)
 269
 270 #undef __print_flags
 271 #define __print_flags(flag, delim, flag_array...)                       \
 272         ({                                                              \
 273                 static const struct trace_print_flags __flags[] =       \
 274                         { flag_array, { -1, NULL }};                    \
 275                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 276         })
 277
 278 #undef __print_symbolic
 279 #define __print_symbolic(value, symbol_array...)                        \
 280         ({                                                              \
 281                 static const struct trace_print_flags symbols[] =       \
 282                         { symbol_array, { -1, NULL }};                  \
 283                 ftrace_print_symbols_seq(p, value, symbols);            \
 284         })
 285
 286 #undef TRACE_EVENT_TEMPLATE
 287 #define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
 288 static enum print_line_t                                                \
 289 ftrace_raw_output_id_##call(int event_id, const char *name,             \
 290                             struct trace_iterator *iter, int flags)     \
 291 {                                                                       \
 292         struct trace_seq *s = &iter->seq;                               \
 293         struct ftrace_raw_##call *field;                                \
 294         struct trace_entry *entry;                                      \
 295         struct trace_seq *p;                                            \
 296         int ret;                                                        \
 297                                                                         \
 298         entry = iter->ent;                                              \
 299                                                                         \
 300         if (entry->type != event_id) {                                  \
 301                 WARN_ON_ONCE(1);                                        \
 302                 return TRACE_TYPE_UNHANDLED;                            \
 303         }                                                               \
 304                                                                         \
 305         field = (typeof(field))entry;                                   \
 306                                                                         \
 307         p = &get_cpu_var(ftrace_event_seq);                             \
 308         trace_seq_init(p);                                              \
 309         ret = trace_seq_printf(s, "%s: ", name);                        \
 310         if (ret)                                                        \
 311                 ret = trace_seq_printf(s, print);                       \
 312         put_cpu();                                                      \
 313         if (!ret)                                                       \
 314                 return TRACE_TYPE_PARTIAL_LINE;                         \
 315                                                                         \
 316         return TRACE_TYPE_HANDLED;                                      \
 317 }
 318
 319 #undef DEFINE_EVENT
 320 #define DEFINE_EVENT(template, name, proto, args)                       \
 321 static enum print_line_t                                                \
 322 ftrace_raw_output_##name(struct trace_iterator *iter, int flags)        \
 323 {                                                                       \
 324         return ftrace_raw_output_id_##template(event_##name.id,         \
 325                                                #name, iter, flags);     \
 326 }
 327
 328 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 329
 330 #undef __field_ext
 331 #define __field_ext(type, item, filter_type)                            \
 332         ret = trace_define_field(event_call, #type, #item,              \
 333                                  offsetof(typeof(field), item),         \
 334                                  sizeof(field.item),                    \
 335                                  is_signed_type(type), filter_type);    \
 336         if (ret)                                                        \
 337                 return ret;
 338
 339 #undef __field
 340 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 341
 342 #undef __array
 343 #define __array(type, item, len)                                        \
 344         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 345         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 346                                  offsetof(typeof(field), item),         \
 347                                  sizeof(field.item), 0, FILTER_OTHER);  \
 348         if (ret)                                                        \
 349                 return ret;
 350
 351 #undef __dynamic_array
 352 #define __dynamic_array(type, item, len)                                       \
 353         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 354                                  offsetof(typeof(field), __data_loc_##item),   \
 355                                  sizeof(field.__data_loc_##item), 0,           \
 356                                  FILTER_OTHER);
 357
 358 #undef __string
 359 #define __string(item, src) __dynamic_array(char, item, -1)
 360
 361 #undef TRACE_EVENT_TEMPLATE
 362 #define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, func, print)   \
 363 static int                                                              \
 364 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 365 {                                                                       \
 366         struct ftrace_raw_##call field;                                 \
 367         int ret;                                                        \
 368                                                                         \
 369         ret = trace_define_common_fields(event_call);                   \
 370         if (ret)                                                        \
 371                 return ret;                                             \
 372                                                                         \
 373         tstruct;                                                        \
 374                                                                         \
 375         return ret;                                                     \
 376 }
 377
 378 #undef DEFINE_EVENT
 379 #define DEFINE_EVENT(template, name, proto, args)
 380
 381 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 382
 383 /*
 384  * remember the offset of each array from the beginning of the event.
 385  */
 386
 387 #undef __entry
 388 #define __entry entry
 389
 390 #undef __field
 391 #define __field(type, item)
 392
 393 #undef __field_ext
 394 #define __field_ext(type, item, filter_type)
 395
 396 #undef __array
 397 #define __array(type, item, len)
 398
 399 #undef __dynamic_array
 400 #define __dynamic_array(type, item, len)                                \
 401         __data_offsets->item = __data_size +                            \
 402                                offsetof(typeof(*entry), __data);        \
 403         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 404         __data_size += (len) * sizeof(type);
 405
 406 #undef __string
 407 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
 408
 409 #undef TRACE_EVENT_TEMPLATE
 410 #define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
 411 static inline int ftrace_get_offsets_##call(                            \
 412         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 413 {                                                                       \
 414         int __data_size = 0;                                            \
 415         struct ftrace_raw_##call __maybe_unused *entry;                 \
 416                                                                         \
 417         tstruct;                                                        \
 418                                                                         \
 419         return __data_size;                                             \
 420 }
 421
 422 #undef DEFINE_EVENT
 423 #define DEFINE_EVENT(template, name, proto, args)
 424
 425 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 426
 427 #ifdef CONFIG_EVENT_PROFILE
 428
 429 /*
 430  * Generate the functions needed for tracepoint perf_event support.
 431  *
 432  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
 433  *
 434  * static int ftrace_profile_enable_<call>(void)
 435  * {
 436  *      return register_trace_<call>(ftrace_profile_<call>);
 437  * }
 438  *
 439  * static void ftrace_profile_disable_<call>(void)
 440  * {
 441  *      unregister_trace_<call>(ftrace_profile_<call>);
 442  * }
 443  *
 444  */
 445
 446 #undef TRACE_EVENT_TEMPLATE
 447 #define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print)
 448
 449 #undef DEFINE_EVENT
 450 #define DEFINE_EVENT(template, name, proto, args)                       \
 451                                                                         \
 452 static void ftrace_profile_##name(proto);                               \
 453                                                                         \
 454 static int ftrace_profile_enable_##name(struct ftrace_event_call *unused)\
 455 {                                                                       \
 456         return register_trace_##name(ftrace_profile_##name);            \
 457 }                                                                       \
 458                                                                         \
 459 static void ftrace_profile_disable_##name(struct ftrace_event_call *unused)\
 460 {                                                                       \
 461         unregister_trace_##name(ftrace_profile_##name);                 \
 462 }
 463
 464 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 465
 466 #endif
 467
 468 /*
 469  * Stage 4 of the trace events.
 470  *
 471  * Override the macros in <trace/trace_events.h> to include the following:
 472  *
 473  * static void ftrace_event_<call>(proto)
 474  * {
 475  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
 476  * }
 477  *
 478  * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
 479  * {
 480  *      int ret;
 481  *
 482  *      ret = register_trace_<call>(ftrace_event_<call>);
 483  *      if (!ret)
 484  *              pr_info("event trace: Could not activate trace point "
 485  *                      "probe to  <call>");
 486  *      return ret;
 487  * }
 488  *
 489  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
 490  * {
 491  *      unregister_trace_<call>(ftrace_event_<call>);
 492  * }
 493  *
 494  *
 495  * For those macros defined with TRACE_EVENT:
 496  *
 497  * static struct ftrace_event_call event_<call>;
 498  *
 499  * static void ftrace_raw_event_<call>(proto)
 500  * {
 501  *      struct ring_buffer_event *event;
 502  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 503  *      struct ring_buffer *buffer;
 504  *      unsigned long irq_flags;
 505  *      int pc;
 506  *
 507  *      local_save_flags(irq_flags);
 508  *      pc = preempt_count();
 509  *
 510  *      event = trace_current_buffer_lock_reserve(&buffer,
 511  *                                event_<call>.id,
 512  *                                sizeof(struct ftrace_raw_<call>),
 513  *                                irq_flags, pc);
 514  *      if (!event)
 515  *              return;
 516  *      entry   = ring_buffer_event_data(event);
 517  *
 518  *      <assign>;  <-- Here we assign the entries by the __field and
 519  *                      __array macros.
 520  *
 521  *      trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
 522  * }
 523  *
 524  * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
 525  * {
 526  *      int ret;
 527  *
 528  *      ret = register_trace_<call>(ftrace_raw_event_<call>);
 529  *      if (!ret)
 530  *              pr_info("event trace: Could not activate trace point "
 531  *                      "probe to <call>");
 532  *      return ret;
 533  * }
 534  *
 535  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
 536  * {
 537  *      unregister_trace_<call>(ftrace_raw_event_<call>);
 538  * }
 539  *
 540  * static struct trace_event ftrace_event_type_<call> = {
 541  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 542  * };
 543  *
 544  * static int ftrace_raw_init_event_<call>(struct ftrace_event_call *unused)
 545  * {
 546  *      int id;
 547  *
 548  *      id = register_ftrace_event(&ftrace_event_type_<call>);
 549  *      if (!id)
 550  *              return -ENODEV;
 551  *      event_<call>.id = id;
 552  *      return 0;
 553  * }
 554  *
 555  * static struct ftrace_event_call __used
 556  * __attribute__((__aligned__(4)))
 557  * __attribute__((section("_ftrace_events"))) event_<call> = {
 558  *      .name                   = "<call>",
 559  *      .system                 = "<system>",
 560  *      .raw_init               = ftrace_raw_init_event_<call>,
 561  *      .regfunc                = ftrace_reg_event_<call>,
 562  *      .unregfunc              = ftrace_unreg_event_<call>,
 563  *      .show_format            = ftrace_format_<call>,
 564  * }
 565  *
 566  */
 567
 568 #undef TP_FMT
 569 #define TP_FMT(fmt, args...)    fmt "\n", ##args
 570
 571 #ifdef CONFIG_EVENT_PROFILE
 572
 573 #define _TRACE_PROFILE_INIT(call)                                       \
 574         .profile_count = ATOMIC_INIT(-1),                               \
 575         .profile_enable = ftrace_profile_enable_##call,                 \
 576         .profile_disable = ftrace_profile_disable_##call,
 577
 578 #else
 579 #define _TRACE_PROFILE_INIT(call)
 580 #endif
 581
 582 #undef __entry
 583 #define __entry entry
 584
 585 #undef __field
 586 #define __field(type, item)
 587
 588 #undef __array
 589 #define __array(type, item, len)
 590
 591 #undef __dynamic_array
 592 #define __dynamic_array(type, item, len)                                \
 593         __entry->__data_loc_##item = __data_offsets.item;
 594
 595 #undef __string
 596 #define __string(item, src) __dynamic_array(char, item, -1)             \
 597
 598 #undef __assign_str
 599 #define __assign_str(dst, src)                                          \
 600         strcpy(__get_str(dst), src);
 601
 602 #undef TRACE_EVENT_TEMPLATE
 603 #define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
 604                                                                         \
 605 static void ftrace_raw_event_id_##call(struct ftrace_event_call *event_call, \
 606                                        proto)                           \
 607 {                                                                       \
 608         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 609         struct ring_buffer_event *event;                                \
 610         struct ftrace_raw_##call *entry;                                \
 611         struct ring_buffer *buffer;                                     \
 612         unsigned long irq_flags;                                        \
 613         int __data_size;                                                \
 614         int pc;                                                         \
 615                                                                         \
 616         local_save_flags(irq_flags);                                    \
 617         pc = preempt_count();                                           \
 618                                                                         \
 619         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 620                                                                         \
 621         event = trace_current_buffer_lock_reserve(&buffer,              \
 622                                  event_call->id,                        \
 623                                  sizeof(*entry) + __data_size,          \
 624                                  irq_flags, pc);                        \
 625         if (!event)                                                     \
 626                 return;                                                 \
 627         entry   = ring_buffer_event_data(event);                        \
 628                                                                         \
 629                                                                         \
 630         tstruct                                                         \
 631                                                                         \
 632         { assign; }                                                     \
 633                                                                         \
 634         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 635                 trace_nowake_buffer_unlock_commit(buffer,               \
 636                                                   event, irq_flags, pc); \
 637 }
 638
 639 #undef DEFINE_EVENT
 640 #define DEFINE_EVENT(template, call, proto, args)                       \
 641                                                                         \
 642 static void ftrace_raw_event_##call(proto)                              \
 643 {                                                                       \
 644         ftrace_raw_event_id_##template(&event_##call, args);            \
 645 }                                                                       \
 646                                                                         \
 647 static int ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)\
 648 {                                                                       \
 649         int ret;                                                        \
 650                                                                         \
 651         ret = register_trace_##call(ftrace_raw_event_##call);           \
 652         if (ret)                                                        \
 653                 pr_info("event trace: Could not activate trace point "  \
 654                         "probe to " #call "\n");                        \
 655         return ret;                                                     \
 656 }                                                                       \
 657                                                                         \
 658 static void ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)\
 659 {                                                                       \
 660         unregister_trace_##call(ftrace_raw_event_##call);               \
 661 }                                                                       \
 662                                                                         \
 663 static struct trace_event ftrace_event_type_##call = {                  \
 664         .trace                  = ftrace_raw_output_##call,             \
 665 };                                                                      \
 666                                                                         \
 667 static int ftrace_raw_init_event_##call(struct ftrace_event_call *unused)\
 668 {                                                                       \
 669         int id;                                                         \
 670                                                                         \
 671         id = register_ftrace_event(&ftrace_event_type_##call);          \
 672         if (!id)                                                        \
 673                 return -ENODEV;                                         \
 674         event_##call.id = id;                                           \
 675         INIT_LIST_HEAD(&event_##call.fields);                           \
 676         return 0;                                                       \
 677 }                                                                       \
 678                                                                         \
 679 static struct ftrace_event_call __used                                  \
 680 __attribute__((__aligned__(4)))                                         \
 681 __attribute__((section("_ftrace_events"))) event_##call = {             \
 682         .name                   = #call,                                \
 683         .system                 = __stringify(TRACE_SYSTEM),            \
 684         .event                  = &ftrace_event_type_##call,            \
 685         .raw_init               = ftrace_raw_init_event_##call,         \
 686         .regfunc                = ftrace_raw_reg_event_##call,          \
 687         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 688         .show_format            = ftrace_format_##template,             \
 689         .define_fields          = ftrace_define_fields_##template,      \
 690         _TRACE_PROFILE_INIT(call)                                       \
 691 }
 692
 693 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 694
 695 /*
 696  * Define the insertion callback to profile events
 697  *
 698  * The job is very similar to ftrace_raw_event_<call> except that we don't
 699  * insert in the ring buffer but in a perf counter.
 700  *
 701  * static void ftrace_profile_<call>(proto)
 702  * {
 703  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 704  *      struct ftrace_event_call *event_call = &event_<call>;
 705  *      extern void perf_tp_event(int, u64, u64, void *, int);
 706  *      struct ftrace_raw_##call *entry;
 707  *      struct perf_trace_buf *trace_buf;
 708  *      u64 __addr = 0, __count = 1;
 709  *      unsigned long irq_flags;
 710  *      struct trace_entry *ent;
 711  *      int __entry_size;
 712  *      int __data_size;
 713  *      int __cpu
 714  *      int pc;
 715  *
 716  *      pc = preempt_count();
 717  *
 718  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 719  *
 720  *      // Below we want to get the aligned size by taking into account
 721  *      // the u32 field that will later store the buffer size
 722  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 723  *                           sizeof(u64));
 724  *      __entry_size -= sizeof(u32);
 725  *
 726  *      // Protect the non nmi buffer
 727  *      // This also protects the rcu read side
 728  *      local_irq_save(irq_flags);
 729  *      __cpu = smp_processor_id();
 730  *
 731  *      if (in_nmi())
 732  *              trace_buf = rcu_dereference(perf_trace_buf_nmi);
 733  *      else
 734  *              trace_buf = rcu_dereference(perf_trace_buf);
 735  *
 736  *      if (!trace_buf)
 737  *              goto end;
 738  *
 739  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
 740  *
 741  *      // Avoid recursion from perf that could mess up the buffer
 742  *      if (trace_buf->recursion++)
 743  *              goto end_recursion;
 744  *
 745  *      raw_data = trace_buf->buf;
 746  *
 747  *      // Make recursion update visible before entering perf_tp_event
 748  *      // so that we protect from perf recursions.
 749  *
 750  *      barrier();
 751  *
 752  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 753  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 754  *      entry = (struct ftrace_raw_<call> *)raw_data;
 755  *      ent = &entry->ent;
 756  *      tracing_generic_entry_update(ent, irq_flags, pc);
 757  *      ent->type = event_call->id;
 758  *
 759  *      <tstruct> <- do some jobs with dynamic arrays
 760  *
 761  *      <assign>  <- affect our values
 762  *
 763  *      perf_tp_event(event_call->id, __addr, __count, entry,
 764  *                   __entry_size);  <- submit them to perf counter
 765  *
 766  * }
 767  */
 768
 769 #ifdef CONFIG_EVENT_PROFILE
 770
 771 #undef __perf_addr
 772 #define __perf_addr(a) __addr = (a)
 773
 774 #undef __perf_count
 775 #define __perf_count(c) __count = (c)
 776
 777 #undef TRACE_EVENT_TEMPLATE
 778 #define TRACE_EVENT_TEMPLATE(call, proto, args, tstruct, assign, print) \
 779 static void                                                             \
 780 ftrace_profile_templ_##call(struct ftrace_event_call *event_call,       \
 781                             proto)                                      \
 782 {                                                                       \
 783         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 784         extern int perf_swevent_get_recursion_context(void);            \
 785         extern void perf_swevent_put_recursion_context(int rctx);       \
 786         extern void perf_tp_event(int, u64, u64, void *, int);          \
 787         struct ftrace_raw_##call *entry;                                \
 788         u64 __addr = 0, __count = 1;                                    \
 789         unsigned long irq_flags;                                        \
 790         struct trace_entry *ent;                                        \
 791         int __entry_size;                                               \
 792         int __data_size;                                                \
 793         char *trace_buf;                                                \
 794         char *raw_data;                                                 \
 795         int __cpu;                                                      \
 796         int rctx;                                                       \
 797         int pc;                                                         \
 798                                                                         \
 799         pc = preempt_count();                                           \
 800                                                                         \
 801         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 802         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 803                              sizeof(u64));                              \
 804         __entry_size -= sizeof(u32);                                    \
 805                                                                         \
 806         if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE,           \
 807                       "profile buffer not large enough"))               \
 808                 return;                                                 \
 809                                                                         \
 810         local_irq_save(irq_flags);                                      \
 811                                                                         \
 812         rctx = perf_swevent_get_recursion_context();                    \
 813         if (rctx < 0)                                                   \
 814                 goto end_recursion;                                     \
 815                                                                         \
 816         __cpu = smp_processor_id();                                     \
 817                                                                         \
 818         if (in_nmi())                                                   \
 819                 trace_buf = rcu_dereference(perf_trace_buf_nmi);        \
 820         else                                                            \
 821                 trace_buf = rcu_dereference(perf_trace_buf);            \
 822                                                                         \
 823         if (!trace_buf)                                                 \
 824                 goto end;                                               \
 825                                                                         \
 826         raw_data = per_cpu_ptr(trace_buf, __cpu);                       \
 827                                                                         \
 828         *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;         \
 829         entry = (struct ftrace_raw_##call *)raw_data;                   \
 830         ent = &entry->ent;                                              \
 831         tracing_generic_entry_update(ent, irq_flags, pc);               \
 832         ent->type = event_call->id;                                     \
 833                                                                         \
 834         tstruct                                                         \
 835                                                                         \
 836         { assign; }                                                     \
 837                                                                         \
 838         perf_tp_event(event_call->id, __addr, __count, entry,           \
 839                              __entry_size);                             \
 840                                                                         \
 841 end:                                                                    \
 842         perf_swevent_put_recursion_context(rctx);                       \
 843 end_recursion:                                                          \
 844         local_irq_restore(irq_flags);                                   \
 845                                                                         \
 846 }
 847
 848 #undef DEFINE_EVENT
 849 #define DEFINE_EVENT(template, call, proto, args)               \
 850 static void ftrace_profile_##call(proto)                        \
 851 {                                                               \
 852         struct ftrace_event_call *event_call = &event_##call;   \
 853                                                                 \
 854         ftrace_profile_templ_##template(event_call, args);      \
 855 }
 856
 857 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 858 #endif /* CONFIG_EVENT_PROFILE */
 859
 860 #undef _TRACE_PROFILE_INIT
 861