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