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                                                                         \
  67         static struct ftrace_event_class event_class_##name;
  68
  69 #undef DEFINE_EVENT
  70 #define DEFINE_EVENT(template, name, proto, args)       \
  71         static struct ftrace_event_call __used          \
  72         __attribute__((__aligned__(4))) event_##name
  73
  74 #undef DEFINE_EVENT_PRINT
  75 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
  76         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
  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, PARAMS(proto), PARAMS(args),                  \
  83                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
  84
  85 #undef TRACE_EVENT_FLAGS
  86 #define TRACE_EVENT_FLAGS(name, value)                                  \
  87         __TRACE_EVENT_FLAGS(name, value)
  88
  89 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
  90
  91
  92 /*
  93  * Stage 2 of the trace events.
  94  *
  95  * Include the following:
  96  *
  97  * struct ftrace_data_offsets_<call> {
  98  *      u32                             <item1>;
  99  *      u32                             <item2>;
 100  *      [...]
 101  * };
 102  *
 103  * The __dynamic_array() macro will create each u32 <item>, this is
 104  * to keep the offset of each array from the beginning of the event.
 105  * The size of an array is also encoded, in the higher 16 bits of <item>.
 106  */
 107
 108 #undef __field
 109 #define __field(type, item)
 110
 111 #undef __field_ext
 112 #define __field_ext(type, item, filter_type)
 113
 114 #undef __array
 115 #define __array(type, item, len)
 116
 117 #undef __dynamic_array
 118 #define __dynamic_array(type, item, len)        u32 item;
 119
 120 #undef __string
 121 #define __string(item, src) __dynamic_array(char, item, -1)
 122
 123 #undef DECLARE_EVENT_CLASS
 124 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 125         struct ftrace_data_offsets_##call {                             \
 126                 tstruct;                                                \
 127         };
 128
 129 #undef DEFINE_EVENT
 130 #define DEFINE_EVENT(template, name, proto, args)
 131
 132 #undef DEFINE_EVENT_PRINT
 133 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 134         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 135
 136 #undef TRACE_EVENT_FLAGS
 137 #define TRACE_EVENT_FLAGS(event, flag)
 138
 139 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 140
 141 /*
 142  * Stage 3 of the trace events.
 143  *
 144  * Override the macros in <trace/trace_events.h> to include the following:
 145  *
 146  * enum print_line_t
 147  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
 148  * {
 149  *      struct trace_seq *s = &iter->seq;
 150  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
 151  *      struct trace_entry *entry;
 152  *      struct trace_seq *p = &iter->tmp_seq;
 153  *      int ret;
 154  *
 155  *      entry = iter->ent;
 156  *
 157  *      if (entry->type != event_<call>->event.type) {
 158  *              WARN_ON_ONCE(1);
 159  *              return TRACE_TYPE_UNHANDLED;
 160  *      }
 161  *
 162  *      field = (typeof(field))entry;
 163  *
 164  *      trace_seq_init(p);
 165  *      ret = trace_seq_printf(s, "%s: ", <call>);
 166  *      if (ret)
 167  *              ret = trace_seq_printf(s, <TP_printk> "\n");
 168  *      if (!ret)
 169  *              return TRACE_TYPE_PARTIAL_LINE;
 170  *
 171  *      return TRACE_TYPE_HANDLED;
 172  * }
 173  *
 174  * This is the method used to print the raw event to the trace
 175  * output format. Note, this is not needed if the data is read
 176  * in binary.
 177  */
 178
 179 #undef __entry
 180 #define __entry field
 181
 182 #undef TP_printk
 183 #define TP_printk(fmt, args...) fmt "\n", args
 184
 185 #undef __get_dynamic_array
 186 #define __get_dynamic_array(field)      \
 187                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 188
 189 #undef __get_str
 190 #define __get_str(field) (char *)__get_dynamic_array(field)
 191
 192 #undef __print_flags
 193 #define __print_flags(flag, delim, flag_array...)                       \
 194         ({                                                              \
 195                 static const struct trace_print_flags __flags[] =       \
 196                         { flag_array, { -1, NULL }};                    \
 197                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
 198         })
 199
 200 #undef __print_symbolic
 201 #define __print_symbolic(value, symbol_array...)                        \
 202         ({                                                              \
 203                 static const struct trace_print_flags symbols[] =       \
 204                         { symbol_array, { -1, NULL }};                  \
 205                 ftrace_print_symbols_seq(p, value, symbols);            \
 206         })
 207
 208 #undef __print_symbolic_u64
 209 #if BITS_PER_LONG == 32
 210 #define __print_symbolic_u64(value, symbol_array...)                    \
 211         ({                                                              \
 212                 static const struct trace_print_flags_u64 symbols[] =   \
 213                         { symbol_array, { -1, NULL } };                 \
 214                 ftrace_print_symbols_seq_u64(p, value, symbols);        \
 215         })
 216 #else
 217 #define __print_symbolic_u64(value, symbol_array...)                    \
 218                         __print_symbolic(value, symbol_array)
 219 #endif
 220
 221 #undef __print_hex
 222 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
 223
 224 #undef DECLARE_EVENT_CLASS
 225 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 226 static notrace enum print_line_t                                        \
 227 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 228                          struct trace_event *trace_event)               \
 229 {                                                                       \
 230         struct ftrace_event_call *event;                                \
 231         struct trace_seq *s = &iter->seq;                               \
 232         struct ftrace_raw_##call *field;                                \
 233         struct trace_entry *entry;                                      \
 234         struct trace_seq *p = &iter->tmp_seq;                           \
 235         int ret;                                                        \
 236                                                                         \
 237         event = container_of(trace_event, struct ftrace_event_call,     \
 238                              event);                                    \
 239                                                                         \
 240         entry = iter->ent;                                              \
 241                                                                         \
 242         if (entry->type != event->event.type) {                         \
 243                 WARN_ON_ONCE(1);                                        \
 244                 return TRACE_TYPE_UNHANDLED;                            \
 245         }                                                               \
 246                                                                         \
 247         field = (typeof(field))entry;                                   \
 248                                                                         \
 249         trace_seq_init(p);                                              \
 250         ret = trace_seq_printf(s, "%s: ", event->name);                 \
 251         if (ret)                                                        \
 252                 ret = trace_seq_printf(s, print);                       \
 253         if (!ret)                                                       \
 254                 return TRACE_TYPE_PARTIAL_LINE;                         \
 255                                                                         \
 256         return TRACE_TYPE_HANDLED;                                      \
 257 }                                                                       \
 258 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 259         .trace                  = ftrace_raw_output_##call,             \
 260 };
 261
 262 #undef DEFINE_EVENT_PRINT
 263 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 264 static notrace enum print_line_t                                        \
 265 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
 266                          struct trace_event *event)                     \
 267 {                                                                       \
 268         struct trace_seq *s = &iter->seq;                               \
 269         struct ftrace_raw_##template *field;                            \
 270         struct trace_entry *entry;                                      \
 271         struct trace_seq *p = &iter->tmp_seq;                           \
 272         int ret;                                                        \
 273                                                                         \
 274         entry = iter->ent;                                              \
 275                                                                         \
 276         if (entry->type != event_##call.event.type) {                   \
 277                 WARN_ON_ONCE(1);                                        \
 278                 return TRACE_TYPE_UNHANDLED;                            \
 279         }                                                               \
 280                                                                         \
 281         field = (typeof(field))entry;                                   \
 282                                                                         \
 283         trace_seq_init(p);                                              \
 284         ret = trace_seq_printf(s, "%s: ", #call);                       \
 285         if (ret)                                                        \
 286                 ret = trace_seq_printf(s, print);                       \
 287         if (!ret)                                                       \
 288                 return TRACE_TYPE_PARTIAL_LINE;                         \
 289                                                                         \
 290         return TRACE_TYPE_HANDLED;                                      \
 291 }                                                                       \
 292 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
 293         .trace                  = ftrace_raw_output_##call,             \
 294 };
 295
 296 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 297
 298 #undef __field_ext
 299 #define __field_ext(type, item, filter_type)                            \
 300         ret = trace_define_field(event_call, #type, #item,              \
 301                                  offsetof(typeof(field), item),         \
 302                                  sizeof(field.item),                    \
 303                                  is_signed_type(type), filter_type);    \
 304         if (ret)                                                        \
 305                 return ret;
 306
 307 #undef __field
 308 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 309
 310 #undef __array
 311 #define __array(type, item, len)                                        \
 312         do {                                                            \
 313                 mutex_lock(&event_storage_mutex);                       \
 314                 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
 315                 snprintf(event_storage, sizeof(event_storage),          \
 316                          "%s[%d]", #type, len);                         \
 317                 ret = trace_define_field(event_call, event_storage, #item, \
 318                                  offsetof(typeof(field), item),         \
 319                                  sizeof(field.item),                    \
 320                                  is_signed_type(type), FILTER_OTHER);   \
 321                 mutex_unlock(&event_storage_mutex);                     \
 322                 if (ret)                                                \
 323                         return ret;                                     \
 324         } while (0);
 325
 326 #undef __dynamic_array
 327 #define __dynamic_array(type, item, len)                                       \
 328         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 329                                  offsetof(typeof(field), __data_loc_##item),   \
 330                                  sizeof(field.__data_loc_##item),              \
 331                                  is_signed_type(type), FILTER_OTHER);
 332
 333 #undef __string
 334 #define __string(item, src) __dynamic_array(char, item, -1)
 335
 336 #undef DECLARE_EVENT_CLASS
 337 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 338 static int notrace                                                      \
 339 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 340 {                                                                       \
 341         struct ftrace_raw_##call field;                                 \
 342         int ret;                                                        \
 343                                                                         \
 344         tstruct;                                                        \
 345                                                                         \
 346         return ret;                                                     \
 347 }
 348
 349 #undef DEFINE_EVENT
 350 #define DEFINE_EVENT(template, name, proto, args)
 351
 352 #undef DEFINE_EVENT_PRINT
 353 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 354         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 355
 356 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 357
 358 /*
 359  * remember the offset of each array from the beginning of the event.
 360  */
 361
 362 #undef __entry
 363 #define __entry entry
 364
 365 #undef __field
 366 #define __field(type, item)
 367
 368 #undef __field_ext
 369 #define __field_ext(type, item, filter_type)
 370
 371 #undef __array
 372 #define __array(type, item, len)
 373
 374 #undef __dynamic_array
 375 #define __dynamic_array(type, item, len)                                \
 376         __data_offsets->item = __data_size +                            \
 377                                offsetof(typeof(*entry), __data);        \
 378         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 379         __data_size += (len) * sizeof(type);
 380
 381 #undef __string
 382 #define __string(item, src) __dynamic_array(char, item,                 \
 383                     strlen((src) ? (const char *)(src) : "(null)") + 1)
 384
 385 #undef DECLARE_EVENT_CLASS
 386 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 387 static inline notrace int ftrace_get_offsets_##call(                    \
 388         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 389 {                                                                       \
 390         int __data_size = 0;                                            \
 391         struct ftrace_raw_##call __maybe_unused *entry;                 \
 392                                                                         \
 393         tstruct;                                                        \
 394                                                                         \
 395         return __data_size;                                             \
 396 }
 397
 398 #undef DEFINE_EVENT
 399 #define DEFINE_EVENT(template, name, proto, args)
 400
 401 #undef DEFINE_EVENT_PRINT
 402 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 403         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 404
 405 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 406
 407 /*
 408  * Stage 4 of the trace events.
 409  *
 410  * Override the macros in <trace/trace_events.h> to include the following:
 411  *
 412  * For those macros defined with TRACE_EVENT:
 413  *
 414  * static struct ftrace_event_call event_<call>;
 415  *
 416  * static void ftrace_raw_event_<call>(void *__data, proto)
 417  * {
 418  *      struct ftrace_event_call *event_call = __data;
 419  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 420  *      struct ring_buffer_event *event;
 421  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 422  *      struct ring_buffer *buffer;
 423  *      unsigned long irq_flags;
 424  *      int __data_size;
 425  *      int pc;
 426  *
 427  *      local_save_flags(irq_flags);
 428  *      pc = preempt_count();
 429  *
 430  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 431  *
 432  *      event = trace_current_buffer_lock_reserve(&buffer,
 433  *                                event_<call>->event.type,
 434  *                                sizeof(*entry) + __data_size,
 435  *                                irq_flags, pc);
 436  *      if (!event)
 437  *              return;
 438  *      entry   = ring_buffer_event_data(event);
 439  *
 440  *      { <assign>; }  <-- Here we assign the entries by the __field and
 441  *                         __array macros.
 442  *
 443  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
 444  *              trace_current_buffer_unlock_commit(buffer,
 445  *                                                 event, irq_flags, pc);
 446  * }
 447  *
 448  * static struct trace_event ftrace_event_type_<call> = {
 449  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 450  * };
 451  *
 452  * static const char print_fmt_<call>[] = <TP_printk>;
 453  *
 454  * static struct ftrace_event_class __used event_class_<template> = {
 455  *      .system                 = "<system>",
 456  *      .define_fields          = ftrace_define_fields_<call>,
 457  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
 458  *      .raw_init               = trace_event_raw_init,
 459  *      .probe                  = ftrace_raw_event_##call,
 460  *      .reg                    = ftrace_event_reg,
 461  * };
 462  *
 463  * static struct ftrace_event_call event_<call> = {
 464  *      .name                   = "<call>",
 465  *      .class                  = event_class_<template>,
 466  *      .event                  = &ftrace_event_type_<call>,
 467  *      .print_fmt              = print_fmt_<call>,
 468  * };
 469  * // its only safe to use pointers when doing linker tricks to
 470  * // create an array.
 471  * static struct ftrace_event_call __used
 472  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
 473  *
 474  */
 475
 476 #ifdef CONFIG_PERF_EVENTS
 477
 478 #define _TRACE_PERF_PROTO(call, proto)                                  \
 479         static notrace void                                             \
 480         perf_trace_##call(void *__data, proto);
 481
 482 #define _TRACE_PERF_INIT(call)                                          \
 483         .perf_probe             = perf_trace_##call,
 484
 485 #else
 486 #define _TRACE_PERF_PROTO(call, proto)
 487 #define _TRACE_PERF_INIT(call)
 488 #endif /* CONFIG_PERF_EVENTS */
 489
 490 #undef __entry
 491 #define __entry entry
 492
 493 #undef __field
 494 #define __field(type, item)
 495
 496 #undef __array
 497 #define __array(type, item, len)
 498
 499 #undef __dynamic_array
 500 #define __dynamic_array(type, item, len)                                \
 501         __entry->__data_loc_##item = __data_offsets.item;
 502
 503 #undef __string
 504 #define __string(item, src) __dynamic_array(char, item, -1)             \
 505
 506 #undef __assign_str
 507 #define __assign_str(dst, src)                                          \
 508         strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
 509
 510 #undef TP_fast_assign
 511 #define TP_fast_assign(args...) args
 512
 513 #undef TP_perf_assign
 514 #define TP_perf_assign(args...)
 515
 516 #undef DECLARE_EVENT_CLASS
 517 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 518                                                                         \
 519 static notrace void                                                     \
 520 ftrace_raw_event_##call(void *__data, proto)                            \
 521 {                                                                       \
 522         struct ftrace_event_call *event_call = __data;                  \
 523         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 524         struct ring_buffer_event *event;                                \
 525         struct ftrace_raw_##call *entry;                                \
 526         struct ring_buffer *buffer;                                     \
 527         unsigned long irq_flags;                                        \
 528         int __data_size;                                                \
 529         int pc;                                                         \
 530                                                                         \
 531         local_save_flags(irq_flags);                                    \
 532         pc = preempt_count();                                           \
 533                                                                         \
 534         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 535                                                                         \
 536         event = trace_current_buffer_lock_reserve(&buffer,              \
 537                                  event_call->event.type,                \
 538                                  sizeof(*entry) + __data_size,          \
 539                                  irq_flags, pc);                        \
 540         if (!event)                                                     \
 541                 return;                                                 \
 542         entry   = ring_buffer_event_data(event);                        \
 543                                                                         \
 544         tstruct                                                         \
 545                                                                         \
 546         { assign; }                                                     \
 547                                                                         \
 548         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 549                 trace_nowake_buffer_unlock_commit(buffer,               \
 550                                                   event, irq_flags, pc); \
 551 }
 552 /*
 553  * The ftrace_test_probe is compiled out, it is only here as a build time check
 554  * to make sure that if the tracepoint handling changes, the ftrace probe will
 555  * fail to compile unless it too is updated.
 556  */
 557
 558 #undef DEFINE_EVENT
 559 #define DEFINE_EVENT(template, call, proto, args)                       \
 560 static inline void ftrace_test_probe_##call(void)                       \
 561 {                                                                       \
 562         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
 563 }
 564
 565 #undef DEFINE_EVENT_PRINT
 566 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
 567
 568 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 569
 570 #undef __entry
 571 #define __entry REC
 572
 573 #undef __print_flags
 574 #undef __print_symbolic
 575 #undef __get_dynamic_array
 576 #undef __get_str
 577
 578 #undef TP_printk
 579 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 580
 581 #undef DECLARE_EVENT_CLASS
 582 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 583 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
 584 static const char print_fmt_##call[] = print;                           \
 585 static struct ftrace_event_class __used event_class_##call = {          \
 586         .system                 = __stringify(TRACE_SYSTEM),            \
 587         .define_fields          = ftrace_define_fields_##call,          \
 588         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
 589         .raw_init               = trace_event_raw_init,                 \
 590         .probe                  = ftrace_raw_event_##call,              \
 591         .reg                    = ftrace_event_reg,                     \
 592         _TRACE_PERF_INIT(call)                                          \
 593 };
 594
 595 #undef DEFINE_EVENT
 596 #define DEFINE_EVENT(template, call, proto, args)                       \
 597                                                                         \
 598 static struct ftrace_event_call __used event_##call = {                 \
 599         .name                   = #call,                                \
 600         .class                  = &event_class_##template,              \
 601         .event.funcs            = &ftrace_event_type_funcs_##template,  \
 602         .print_fmt              = print_fmt_##template,                 \
 603 };                                                                      \
 604 static struct ftrace_event_call __used                                  \
 605 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 606
 607 #undef DEFINE_EVENT_PRINT
 608 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 609                                                                         \
 610 static const char print_fmt_##call[] = print;                           \
 611                                                                         \
 612 static struct ftrace_event_call __used event_##call = {                 \
 613         .name                   = #call,                                \
 614         .class                  = &event_class_##template,              \
 615         .event.funcs            = &ftrace_event_type_funcs_##call,      \
 616         .print_fmt              = print_fmt_##call,                     \
 617 };                                                                      \
 618 static struct ftrace_event_call __used                                  \
 619 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 620
 621 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 622
 623 /*
 624  * Define the insertion callback to perf events
 625  *
 626  * The job is very similar to ftrace_raw_event_<call> except that we don't
 627  * insert in the ring buffer but in a perf counter.
 628  *
 629  * static void ftrace_perf_<call>(proto)
 630  * {
 631  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 632  *      struct ftrace_event_call *event_call = &event_<call>;
 633  *      extern void perf_tp_event(int, u64, u64, void *, int);
 634  *      struct ftrace_raw_##call *entry;
 635  *      struct perf_trace_buf *trace_buf;
 636  *      u64 __addr = 0, __count = 1;
 637  *      unsigned long irq_flags;
 638  *      struct trace_entry *ent;
 639  *      int __entry_size;
 640  *      int __data_size;
 641  *      int __cpu
 642  *      int pc;
 643  *
 644  *      pc = preempt_count();
 645  *
 646  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 647  *
 648  *      // Below we want to get the aligned size by taking into account
 649  *      // the u32 field that will later store the buffer size
 650  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 651  *                           sizeof(u64));
 652  *      __entry_size -= sizeof(u32);
 653  *
 654  *      // Protect the non nmi buffer
 655  *      // This also protects the rcu read side
 656  *      local_irq_save(irq_flags);
 657  *      __cpu = smp_processor_id();
 658  *
 659  *      if (in_nmi())
 660  *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
 661  *      else
 662  *              trace_buf = rcu_dereference_sched(perf_trace_buf);
 663  *
 664  *      if (!trace_buf)
 665  *              goto end;
 666  *
 667  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
 668  *
 669  *      // Avoid recursion from perf that could mess up the buffer
 670  *      if (trace_buf->recursion++)
 671  *              goto end_recursion;
 672  *
 673  *      raw_data = trace_buf->buf;
 674  *
 675  *      // Make recursion update visible before entering perf_tp_event
 676  *      // so that we protect from perf recursions.
 677  *
 678  *      barrier();
 679  *
 680  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 681  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 682  *      entry = (struct ftrace_raw_<call> *)raw_data;
 683  *      ent = &entry->ent;
 684  *      tracing_generic_entry_update(ent, irq_flags, pc);
 685  *      ent->type = event_call->id;
 686  *
 687  *      <tstruct> <- do some jobs with dynamic arrays
 688  *
 689  *      <assign>  <- affect our values
 690  *
 691  *      perf_tp_event(event_call->id, __addr, __count, entry,
 692  *                   __entry_size);  <- submit them to perf counter
 693  *
 694  * }
 695  */
 696
 697 #ifdef CONFIG_PERF_EVENTS
 698
 699 #undef __entry
 700 #define __entry entry
 701
 702 #undef __get_dynamic_array
 703 #define __get_dynamic_array(field)      \
 704                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 705
 706 #undef __get_str
 707 #define __get_str(field) (char *)__get_dynamic_array(field)
 708
 709 #undef __perf_addr
 710 #define __perf_addr(a) __addr = (a)
 711
 712 #undef __perf_count
 713 #define __perf_count(c) __count = (c)
 714
 715 #undef TP_perf_assign
 716 #define TP_perf_assign(args...) args
 717
 718 #undef DECLARE_EVENT_CLASS
 719 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 720 static notrace void                                                     \
 721 perf_trace_##call(void *__data, proto)                                  \
 722 {                                                                       \
 723         struct ftrace_event_call *event_call = __data;                  \
 724         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 725         struct ftrace_raw_##call *entry;                                \
 726         struct pt_regs __regs;                                          \
 727         u64 __addr = 0, __count = 1;                                    \
 728         struct hlist_head *head;                                        \
 729         int __entry_size;                                               \
 730         int __data_size;                                                \
 731         int rctx;                                                       \
 732                                                                         \
 733         perf_fetch_caller_regs(&__regs);                                \
 734                                                                         \
 735         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 736         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 737                              sizeof(u64));                              \
 738         __entry_size -= sizeof(u32);                                    \
 739                                                                         \
 740         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
 741                       "profile buffer not large enough"))               \
 742                 return;                                                 \
 743                                                                         \
 744         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
 745                 __entry_size, event_call->event.type, &__regs, &rctx);  \
 746         if (!entry)                                                     \
 747                 return;                                                 \
 748                                                                         \
 749         tstruct                                                         \
 750                                                                         \
 751         { assign; }                                                     \
 752                                                                         \
 753         head = this_cpu_ptr(event_call->perf_events);                   \
 754         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 755                 __count, &__regs, head);                                \
 756 }
 757
 758 /*
 759  * This part is compiled out, it is only here as a build time check
 760  * to make sure that if the tracepoint handling changes, the
 761  * perf probe will fail to compile unless it too is updated.
 762  */
 763 #undef DEFINE_EVENT
 764 #define DEFINE_EVENT(template, call, proto, args)                       \
 765 static inline void perf_test_probe_##call(void)                         \
 766 {                                                                       \
 767         check_trace_callback_type_##call(perf_trace_##template);        \
 768 }
 769
 770
 771 #undef DEFINE_EVENT_PRINT
 772 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 773         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 774
 775 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 776 #endif /* CONFIG_PERF_EVENTS */
 777
 778 #undef _TRACE_PROFILE_INIT
 779