probes/lttng-events.h

   1 #include <lttng.h>
   2
   3 /*
   4  * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
   5  * strcpy().
   6  */
   7 #define tp_assign(dest, src)                                            \
   8         lib_ring_buffer_align_ctx(config, &ctx, sizeof(src));           \
   9         lib_ring_buffer_write(config, &ctx, &src, sizeof(src));
  10
  11 #define tp_memcpy(dest, src, len)                                       \
  12         lib_ring_buffer_align_ctx(config, &ctx, sizeof(*(src)));        \
  13         lib_ring_buffer_write(config, &ctx, &src, len);
  14
  15 /* TODO */
  16 #define tp_strcpy(dest, src)            __assign_str(dest, src)
  17
  18 /*
  19  * Stage 1 of the trace events.
  20  *
  21  * Create event field type metadata section.
  22  */
  23
  24 /*
  25  * DECLARE_EVENT_CLASS can be used to add a generic function
  26  * handlers for events. That is, if all events have the same
  27  * parameters and just have distinct trace points.
  28  * Each tracepoint can be defined with DEFINE_EVENT and that
  29  * will map the DECLARE_EVENT_CLASS to the tracepoint.
  30  *
  31  * TRACE_EVENT is a one to one mapping between tracepoint and template.
  32  */
  33 #undef TRACE_EVENT
  34 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
  35         DECLARE_EVENT_CLASS(name,                              \
  36                              PARAMS(proto),                    \
  37                              PARAMS(args),                     \
  38                              PARAMS(tstruct),                  \
  39                              PARAMS(assign),                   \
  40                              PARAMS(print));                   \
  41         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
  42
  43 /* Field types must be defined in lttng-types.h */
  44
  45 #undef __field
  46 #define __field(type, item)             type    item;
  47
  48 #undef __field_ext
  49 #define __field_ext(type, item, filter_type)    type    item;
  50
  51 #undef __array
  52 #define __array(type, item, len)                                \
  53         type { parent = array; length = len; elem_type = type; } item;
  54
  55 /* TODO */
  56
  57 #undef __dynamic_array
  58 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
  59
  60 #undef __string
  61 #define __string(item, src) __dynamic_array(char, item, -1)
  62
  63 #undef TP_STRUCT__entry
  64 #define TP_STRUCT__entry(args...) args
  65
  66 #undef DECLARE_EVENT_CLASS
  67 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
  68         struct ftrace_raw_##name {                                      \
  69                 struct trace_entry      ent;                            \
  70                 tstruct                                                 \
  71                 char                    __data[0];                      \
  72         };                                                              \
  73                                                                         \
  74         static struct ftrace_event_class event_class_##name;
  75
  76 #undef DEFINE_EVENT
  77 #define DEFINE_EVENT(template, name, proto, args)       \
  78         static struct ftrace_event_call __used          \
  79         __attribute__((__aligned__(4))) event_##name
  80
  81 #undef DEFINE_EVENT_PRINT
  82 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  83         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  84
  85 /* Callbacks are meaningless to ftrace. */
  86 #undef TRACE_EVENT_FN
  87 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
  88                 assign, print, reg, unreg)                              \
  89         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
  90                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
  91
  92
  93
  94
  95 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  96
  97 /*
  98  * Stage 2 of the trace events.
  99  *
 100  * Create static inline function that calculates event size.
 101  */
 102
 103
 104
 105 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 106
 107 /*
 108  * Stage 3 of the trace events.
 109  *
 110  * Create the probe function : call even size calculation and write event data
 111  * into the buffer.
 112  */
 113
 114
 115
 116 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 117
 118
 119
 120
 121 #include <linux/ftrace_event.h>
 122
 123 /*
 124  * DECLARE_EVENT_CLASS can be used to add a generic function
 125  * handlers for events. That is, if all events have the same
 126  * parameters and just have distinct trace points.
 127  * Each tracepoint can be defined with DEFINE_EVENT and that
 128  * will map the DECLARE_EVENT_CLASS to the tracepoint.
 129  *
 130  * TRACE_EVENT is a one to one mapping between tracepoint and template.
 131  */
 132 #undef TRACE_EVENT
 133 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
 134         DECLARE_EVENT_CLASS(name,                              \
 135                              PARAMS(proto),                    \
 136                              PARAMS(args),                     \
 137                              PARAMS(tstruct),                  \
 138                              PARAMS(assign),                   \
 139                              PARAMS(print));                   \
 140         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
 141
 142
 143 #undef __field
 144 #define __field(type, item)             type    item;
 145
 146 #undef __field_ext
 147 #define __field_ext(type, item, filter_type)    type    item;
 148
 149 #undef __array
 150 #define __array(type, item, len)        type    item[len];
 151
 152 #undef __dynamic_array
 153 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
 154
 155 #undef __string
 156 #define __string(item, src) __dynamic_array(char, item, -1)
 157
 158 #undef TP_STRUCT__entry
 159 #define TP_STRUCT__entry(args...) args
 160
 161 #undef DECLARE_EVENT_CLASS
 162 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
 163         struct ftrace_raw_##name {                                      \
 164                 struct trace_entry      ent;                            \
 165                 tstruct                                                 \
 166                 char                    __data[0];                      \
 167         };                                                              \
 168                                                                         \
 169         static struct ftrace_event_class event_class_##name;
 170
 171 #undef DEFINE_EVENT
 172 #define DEFINE_EVENT(template, name, proto, args)       \
 173         static struct ftrace_event_call __used          \
 174         __attribute__((__aligned__(4))) event_##name
 175
 176 #undef DEFINE_EVENT_PRINT
 177 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 178         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 179
 180 /* Callbacks are meaningless to ftrace. */
 181 #undef TRACE_EVENT_FN
 182 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 183                 assign, print, reg, unreg)                              \
 184         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 185                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 186
 187 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 188
 189
 190 /*
 191  * Stage 2 of the trace events.
 192  *
 193  * Create static inline function that calculates event size.
 194  */
 195
 196 #undef __field
 197 #define __field(type, item)
 198
 199 #undef __field_ext
 200 #define __field_ext(type, item, filter_type)
 201
 202 #undef __array
 203 #define __array(type, item, len)
 204
 205 #undef __dynamic_array
 206 #define __dynamic_array(type, item, len)        u32 item;
 207
 208 #undef __string
 209 #define __string(item, src) __dynamic_array(char, item, -1)
 210
 211 #undef DECLARE_EVENT_CLASS
 212 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 213         struct ftrace_data_offsets_##call {                             \
 214                 tstruct;                                                \
 215         };
 216
 217 #undef DEFINE_EVENT
 218 #define DEFINE_EVENT(template, name, proto, args)
 219
 220 #undef DEFINE_EVENT_PRINT
 221 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 222         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 223
 224 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 225
 226 /*
 227  * Stage 3 of the trace events.
 228  *
 229  * Create the probe function : call even size calculation and write event data
 230  * into the buffer.
 231  */
 232
 233 #undef __entry
 234 #define __entry field
 235
 236 #undef TP_printk
 237 #define TP_printk(fmt, args...) fmt "\n", args
 238
 239 #undef __get_dynamic_array
 240 #define __get_dynamic_array(field)      \
 241                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 242
 243 #undef __get_str
 244 #define __get_str(field) (char *)__get_dynamic_array(field)
 245
 246 #undef __print_flags
 247 #define __print_flags(flag, delim, flag_array...)                       \
 248         ({                                                              \
 249                 static const struct trace_print_flags __flags[] =       \
 250                         { flag_array, { -1, NULL }};                    \
 251                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 252         })
 253
 254 #undef __print_symbolic
 255 #define __print_symbolic(value, symbol_array...)                        \
 256         ({                                                              \
 257                 static const struct trace_print_flags symbols[] =       \
 258                         { symbol_array, { -1, NULL }};                  \
 259                 ftrace_print_symbols_seq(p, value, symbols);            \
 260         })
 261
 262 #undef __print_hex
 263 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
 264
 265 #undef DECLARE_EVENT_CLASS
 266 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 267 static notrace enum print_line_t                                        \
 268 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 269                          struct trace_event *trace_event)               \
 270 {                                                                       \
 271         struct ftrace_event_call *event;                                \
 272         struct trace_seq *s = &iter->seq;                               \
 273         struct ftrace_raw_##call *field;                                \
 274         struct trace_entry *entry;                                      \
 275         struct trace_seq *p = &iter->tmp_seq;                           \
 276         int ret;                                                        \
 277                                                                         \
 278         event = container_of(trace_event, struct ftrace_event_call,     \
 279                              event);                                    \
 280                                                                         \
 281         entry = iter->ent;                                              \
 282                                                                         \
 283         if (entry->type != event->event.type) {                         \
 284                 WARN_ON_ONCE(1);                                        \
 285                 return TRACE_TYPE_UNHANDLED;                            \
 286         }                                                               \
 287                                                                         \
 288         field = (typeof(field))entry;                                   \
 289                                                                         \
 290         trace_seq_init(p);                                              \
 291         ret = trace_seq_printf(s, "%s: ", event->name);                 \
 292         if (ret)                                                        \
 293                 ret = trace_seq_printf(s, print);                       \
 294         if (!ret)                                                       \
 295                 return TRACE_TYPE_PARTIAL_LINE;                         \
 296                                                                         \
 297         return TRACE_TYPE_HANDLED;                                      \
 298 }                                                                       \
 299 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 300         .trace                  = ftrace_raw_output_##call,             \
 301 };
 302
 303 #undef DEFINE_EVENT_PRINT
 304 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 305 static notrace enum print_line_t                                        \
 306 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 307                          struct trace_event *event)                     \
 308 {                                                                       \
 309         struct trace_seq *s = &iter->seq;                               \
 310         struct ftrace_raw_##template *field;                            \
 311         struct trace_entry *entry;                                      \
 312         struct trace_seq *p = &iter->tmp_seq;                           \
 313         int ret;                                                        \
 314                                                                         \
 315         entry = iter->ent;                                              \
 316                                                                         \
 317         if (entry->type != event_##call.event.type) {                   \
 318                 WARN_ON_ONCE(1);                                        \
 319                 return TRACE_TYPE_UNHANDLED;                            \
 320         }                                                               \
 321                                                                         \
 322         field = (typeof(field))entry;                                   \
 323                                                                         \
 324         trace_seq_init(p);                                              \
 325         ret = trace_seq_printf(s, "%s: ", #call);                       \
 326         if (ret)                                                        \
 327                 ret = trace_seq_printf(s, print);                       \
 328         if (!ret)                                                       \
 329                 return TRACE_TYPE_PARTIAL_LINE;                         \
 330                                                                         \
 331         return TRACE_TYPE_HANDLED;                                      \
 332 }                                                                       \
 333 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 334         .trace                  = ftrace_raw_output_##call,             \
 335 };
 336
 337 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 338
 339 #undef __field_ext
 340 #define __field_ext(type, item, filter_type)                            \
 341         ret = trace_define_field(event_call, #type, #item,              \
 342                                  offsetof(typeof(field), item),         \
 343                                  sizeof(field.item),                    \
 344                                  is_signed_type(type), filter_type);    \
 345         if (ret)                                                        \
 346                 return ret;
 347
 348 #undef __field
 349 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 350
 351 #undef __array
 352 #define __array(type, item, len)                                        \
 353         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 354         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 355                                  offsetof(typeof(field), item),         \
 356                                  sizeof(field.item),                    \
 357                                  is_signed_type(type), FILTER_OTHER);   \
 358         if (ret)                                                        \
 359                 return ret;
 360
 361 #undef __dynamic_array
 362 #define __dynamic_array(type, item, len)                                       \
 363         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 364                                  offsetof(typeof(field), __data_loc_##item),   \
 365                                  sizeof(field.__data_loc_##item),              \
 366                                  is_signed_type(type), FILTER_OTHER);
 367
 368 #undef __string
 369 #define __string(item, src) __dynamic_array(char, item, -1)
 370
 371 #undef DECLARE_EVENT_CLASS
 372 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 373 static int notrace                                                      \
 374 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 375 {                                                                       \
 376         struct ftrace_raw_##call field;                                 \
 377         int ret;                                                        \
 378                                                                         \
 379         tstruct;                                                        \
 380                                                                         \
 381         return ret;                                                     \
 382 }
 383
 384 #undef DEFINE_EVENT
 385 #define DEFINE_EVENT(template, name, proto, args)
 386
 387 #undef DEFINE_EVENT_PRINT
 388 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 389         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 390
 391 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 392
 393 /*
 394  * remember the offset of each array from the beginning of the event.
 395  */
 396
 397 #undef __entry
 398 #define __entry entry
 399
 400 #undef __field
 401 #define __field(type, item)
 402
 403 #undef __field_ext
 404 #define __field_ext(type, item, filter_type)
 405
 406 #undef __array
 407 #define __array(type, item, len)
 408
 409 #undef __dynamic_array
 410 #define __dynamic_array(type, item, len)                                \
 411         __data_offsets->item = __data_size +                            \
 412                                offsetof(typeof(*entry), __data);        \
 413         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 414         __data_size += (len) * sizeof(type);
 415
 416 #undef __string
 417 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
 418
 419 #undef DECLARE_EVENT_CLASS
 420 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 421 static inline notrace int ftrace_get_offsets_##call(                    \
 422         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 423 {                                                                       \
 424         int __data_size = 0;                                            \
 425         struct ftrace_raw_##call __maybe_unused *entry;                 \
 426                                                                         \
 427         tstruct;                                                        \
 428                                                                         \
 429         return __data_size;                                             \
 430 }
 431
 432 #undef DEFINE_EVENT
 433 #define DEFINE_EVENT(template, name, proto, args)
 434
 435 #undef DEFINE_EVENT_PRINT
 436 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 437         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 438
 439 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 440
 441 /*
 442  * Stage 4 of the trace events.
 443  *
 444  * Override the macros in <trace/trace_events.h> to include the following:
 445  *
 446  * For those macros defined with TRACE_EVENT:
 447  *
 448  * static struct ftrace_event_call event_<call>;
 449  *
 450  * static void ftrace_raw_event_<call>(void *__data, proto)
 451  * {
 452  *      struct ftrace_event_call *event_call = __data;
 453  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 454  *      struct ring_buffer_event *event;
 455  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 456  *      struct ring_buffer *buffer;
 457  *      unsigned long irq_flags;
 458  *      int __data_size;
 459  *      int pc;
 460  *
 461  *      local_save_flags(irq_flags);
 462  *      pc = preempt_count();
 463  *
 464  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 465  *
 466  *      event = trace_current_buffer_lock_reserve(&buffer,
 467  *                                event_<call>->event.type,
 468  *                                sizeof(*entry) + __data_size,
 469  *                                irq_flags, pc);
 470  *      if (!event)
 471  *              return;
 472  *      entry   = ring_buffer_event_data(event);
 473  *
 474  *      { <assign>; }  <-- Here we assign the entries by the __field and
 475  *                         __array macros.
 476  *
 477  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
 478  *              trace_current_buffer_unlock_commit(buffer,
 479  *                                                 event, irq_flags, pc);
 480  * }
 481  *
 482  * static struct trace_event ftrace_event_type_<call> = {
 483  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 484  * };
 485  *
 486  * static const char print_fmt_<call>[] = <TP_printk>;
 487  *
 488  * static struct ftrace_event_class __used event_class_<template> = {
 489  *      .system                 = "<system>",
 490  *      .define_fields          = ftrace_define_fields_<call>,
 491  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 492  *      .raw_init               = trace_event_raw_init,
 493  *      .probe                  = ftrace_raw_event_##call,
 494  *      .reg                    = ftrace_event_reg,
 495  * };
 496  *
 497  * static struct ftrace_event_call __used
 498  * __attribute__((__aligned__(4)))
 499  * __attribute__((section("_ftrace_events"))) event_<call> = {
 500  *      .name                   = "<call>",
 501  *      .class                  = event_class_<template>,
 502  *      .event                  = &ftrace_event_type_<call>,
 503  *      .print_fmt              = print_fmt_<call>,
 504  * };
 505  *
 506  */
 507
 508 #ifdef CONFIG_PERF_EVENTS
 509
 510 #define _TRACE_PERF_PROTO(call, proto)                                  \
 511         static notrace void                                             \
 512         perf_trace_##call(void *__data, proto);
 513
 514 #define _TRACE_PERF_INIT(call)                                          \
 515         .perf_probe             = perf_trace_##call,
 516
 517 #else
 518 #define _TRACE_PERF_PROTO(call, proto)
 519 #define _TRACE_PERF_INIT(call)
 520 #endif /* CONFIG_PERF_EVENTS */
 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 TP_fast_assign
 543 #define TP_fast_assign(args...) args
 544
 545 #undef TP_perf_assign
 546 #define TP_perf_assign(args...)
 547
 548 #undef DECLARE_EVENT_CLASS
 549 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 550                                                                         \
 551 static notrace void                                                     \
 552 ftrace_raw_event_##call(void *__data, proto)                            \
 553 {                                                                       \
 554         struct ftrace_event_call *event_call = __data;                  \
 555         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 556         struct ring_buffer_event *event;                                \
 557         struct ftrace_raw_##call *entry;                                \
 558         struct ring_buffer *buffer;                                     \
 559         unsigned long irq_flags;                                        \
 560         int __data_size;                                                \
 561         int pc;                                                         \
 562                                                                         \
 563         local_save_flags(irq_flags);                                    \
 564         pc = preempt_count();                                           \
 565                                                                         \
 566         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 567                                                                         \
 568         event = trace_current_buffer_lock_reserve(&buffer,              \
 569                                  event_call->event.type,                \
 570                                  sizeof(*entry) + __data_size,          \
 571                                  irq_flags, pc);                        \
 572         if (!event)                                                     \
 573                 return;                                                 \
 574         entry   = ring_buffer_event_data(event);                        \
 575                                                                         \
 576         tstruct                                                         \
 577                                                                         \
 578         { assign; }                                                     \
 579                                                                         \
 580         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 581                 trace_nowake_buffer_unlock_commit(buffer,               \
 582                                                   event, irq_flags, pc); \
 583 }
 584 /*
 585  * The ftrace_test_probe is compiled out, it is only here as a build time check
 586  * to make sure that if the tracepoint handling changes, the ftrace probe will
 587  * fail to compile unless it too is updated.
 588  */
 589
 590 #undef DEFINE_EVENT
 591 #define DEFINE_EVENT(template, call, proto, args)                       \
 592 static inline void ftrace_test_probe_##call(void)                       \
 593 {                                                                       \
 594         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
 595 }
 596
 597 #undef DEFINE_EVENT_PRINT
 598 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 599
 600 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 601
 602 #undef __entry
 603 #define __entry REC
 604
 605 #undef __print_flags
 606 #undef __print_symbolic
 607 #undef __get_dynamic_array
 608 #undef __get_str
 609
 610 #undef TP_printk
 611 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 612
 613 #undef DECLARE_EVENT_CLASS
 614 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 615 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 616 static const char print_fmt_##call[] = print;                           \
 617 static struct ftrace_event_class __used event_class_##call = {          \
 618         .system                 = __stringify(TRACE_SYSTEM),            \
 619         .define_fields          = ftrace_define_fields_##call,          \
 620         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 621         .raw_init               = trace_event_raw_init,                 \
 622         .probe                  = ftrace_raw_event_##call,              \
 623         .reg                    = ftrace_event_reg,                     \
 624         _TRACE_PERF_INIT(call)                                          \
 625 };
 626
 627 #undef DEFINE_EVENT
 628 #define DEFINE_EVENT(template, call, proto, args)                       \
 629                                                                         \
 630 static struct ftrace_event_call __used                                  \
 631 __attribute__((__aligned__(4)))                                         \
 632 __attribute__((section("_ftrace_events"))) event_##call = {             \
 633         .name                   = #call,                                \
 634         .class                  = &event_class_##template,              \
 635         .event.funcs            = &ftrace_event_type_funcs_##template,  \
 636         .print_fmt              = print_fmt_##template,                 \
 637 };
 638
 639 #undef DEFINE_EVENT_PRINT
 640 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 641                                                                         \
 642 static const char print_fmt_##call[] = print;                           \
 643                                                                         \
 644 static struct ftrace_event_call __used                                  \
 645 __attribute__((__aligned__(4)))                                         \
 646 __attribute__((section("_ftrace_events"))) event_##call = {             \
 647         .name                   = #call,                                \
 648         .class                  = &event_class_##template,              \
 649         .event.funcs            = &ftrace_event_type_funcs_##call,      \
 650         .print_fmt              = print_fmt_##call,                     \
 651 }
 652
 653 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 654
 655 /*
 656  * Define the insertion callback to perf events
 657  *
 658  * The job is very similar to ftrace_raw_event_<call> except that we don't
 659  * insert in the ring buffer but in a perf counter.
 660  *
 661  * static void ftrace_perf_<call>(proto)
 662  * {
 663  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 664  *      struct ftrace_event_call *event_call = &event_<call>;
 665  *      extern void perf_tp_event(int, u64, u64, void *, int);
 666  *      struct ftrace_raw_##call *entry;
 667  *      struct perf_trace_buf *trace_buf;
 668  *      u64 __addr = 0, __count = 1;
 669  *      unsigned long irq_flags;
 670  *      struct trace_entry *ent;
 671  *      int __entry_size;
 672  *      int __data_size;
 673  *      int __cpu
 674  *      int pc;
 675  *
 676  *      pc = preempt_count();
 677  *
 678  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 679  *
 680  *      // Below we want to get the aligned size by taking into account
 681  *      // the u32 field that will later store the buffer size
 682  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 683  *                           sizeof(u64));
 684  *      __entry_size -= sizeof(u32);
 685  *
 686  *      // Protect the non nmi buffer
 687  *      // This also protects the rcu read side
 688  *      local_irq_save(irq_flags);
 689  *      __cpu = smp_processor_id();
 690  *
 691  *      if (in_nmi())
 692  *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
 693  *      else
 694  *              trace_buf = rcu_dereference_sched(perf_trace_buf);
 695  *
 696  *      if (!trace_buf)
 697  *              goto end;
 698  *
 699  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
 700  *
 701  *      // Avoid recursion from perf that could mess up the buffer
 702  *      if (trace_buf->recursion++)
 703  *              goto end_recursion;
 704  *
 705  *      raw_data = trace_buf->buf;
 706  *
 707  *      // Make recursion update visible before entering perf_tp_event
 708  *      // so that we protect from perf recursions.
 709  *
 710  *      barrier();
 711  *
 712  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 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> <- do some jobs with dynamic arrays
 720  *
 721  *      <assign>  <- affect our values
 722  *
 723  *      perf_tp_event(event_call->id, __addr, __count, entry,
 724  *                   __entry_size);  <- submit them to perf counter
 725  *
 726  * }
 727  */
 728
 729 #ifdef CONFIG_PERF_EVENTS
 730
 731 #undef __entry
 732 #define __entry entry
 733
 734 #undef __get_dynamic_array
 735 #define __get_dynamic_array(field)      \
 736                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 737
 738 #undef __get_str
 739 #define __get_str(field) (char *)__get_dynamic_array(field)
 740
 741 #undef __perf_addr
 742 #define __perf_addr(a) __addr = (a)
 743
 744 #undef __perf_count
 745 #define __perf_count(c) __count = (c)
 746
 747 #undef DECLARE_EVENT_CLASS
 748 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 749 static notrace void                                                     \
 750 perf_trace_##call(void *__data, proto)                                  \
 751 {                                                                       \
 752         struct ftrace_event_call *event_call = __data;                  \
 753         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 754         struct ftrace_raw_##call *entry;                                \
 755         struct pt_regs __regs;                                          \
 756         u64 __addr = 0, __count = 1;                                    \
 757         struct hlist_head *head;                                        \
 758         int __entry_size;                                               \
 759         int __data_size;                                                \
 760         int rctx;                                                       \
 761                                                                         \
 762         perf_fetch_caller_regs(&__regs);                                \
 763                                                                         \
 764         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 765         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 766                              sizeof(u64));                              \
 767         __entry_size -= sizeof(u32);                                    \
 768                                                                         \
 769         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
 770                       "profile buffer not large enough"))               \
 771                 return;                                                 \
 772                                                                         \
 773         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
 774                 __entry_size, event_call->event.type, &__regs, &rctx);  \
 775         if (!entry)                                                     \
 776                 return;                                                 \
 777                                                                         \
 778         tstruct                                                         \
 779                                                                         \
 780         { assign; }                                                     \
 781                                                                         \
 782         head = this_cpu_ptr(event_call->perf_events);                   \
 783         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 784                 __count, &__regs, head);                                \
 785 }
 786
 787 /*
 788  * This part is compiled out, it is only here as a build time check
 789  * to make sure that if the tracepoint handling changes, the
 790  * perf probe will fail to compile unless it too is updated.
 791  */
 792 #undef DEFINE_EVENT
 793 #define DEFINE_EVENT(template, call, proto, args)                       \
 794 static inline void perf_test_probe_##call(void)                         \
 795 {                                                                       \
 796         check_trace_callback_type_##call(perf_trace_##template);        \
 797 }
 798
 799
 800 #undef DEFINE_EVENT_PRINT
 801 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 802         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 803
 804 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 805 #endif /* CONFIG_PERF_EVENTS */
 806
 807 #undef _TRACE_PROFILE_INIT
 808