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   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 __print_hex
 204 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
 205
 206 #undef DECLARE_EVENT_CLASS
 207 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 208 static notrace enum print_line_t                                        \
 209 ftrace_raw_output_id_##call(int event_id, const char *name,             \
 210                             struct trace_iterator *iter, int flags)     \
 211 {                                                                       \
 212         struct trace_seq *s = &iter->seq;                               \
 213         struct ftrace_raw_##call *field;                                \
 214         struct trace_entry *entry;                                      \
 215         struct trace_seq *p;                                            \
 216         int ret;                                                        \
 217                                                                         \
 218         entry = iter->ent;                                              \
 219                                                                         \
 220         if (entry->type != event_id) {                                  \
 221                 WARN_ON_ONCE(1);                                        \
 222                 return TRACE_TYPE_UNHANDLED;                            \
 223         }                                                               \
 224                                                                         \
 225         field = (typeof(field))entry;                                   \
 226                                                                         \
 227         p = &get_cpu_var(ftrace_event_seq);                             \
 228         trace_seq_init(p);                                              \
 229         ret = trace_seq_printf(s, "%s: ", name);                        \
 230         if (ret)                                                        \
 231                 ret = trace_seq_printf(s, print);                       \
 232         put_cpu();                                                      \
 233         if (!ret)                                                       \
 234                 return TRACE_TYPE_PARTIAL_LINE;                         \
 235                                                                         \
 236         return TRACE_TYPE_HANDLED;                                      \
 237 }
 238
 239 #undef DEFINE_EVENT
 240 #define DEFINE_EVENT(template, name, proto, args)                       \
 241 static notrace enum print_line_t                                        \
 242 ftrace_raw_output_##name(struct trace_iterator *iter, int flags)        \
 243 {                                                                       \
 244         return ftrace_raw_output_id_##template(event_##name.id,         \
 245                                                #name, iter, flags);     \
 246 }
 247
 248 #undef DEFINE_EVENT_PRINT
 249 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 250 static notrace enum print_line_t                                        \
 251 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
 252 {                                                                       \
 253         struct trace_seq *s = &iter->seq;                               \
 254         struct ftrace_raw_##template *field;                            \
 255         struct trace_entry *entry;                                      \
 256         struct trace_seq *p;                                            \
 257         int ret;                                                        \
 258                                                                         \
 259         entry = iter->ent;                                              \
 260                                                                         \
 261         if (entry->type != event_##call.id) {                           \
 262                 WARN_ON_ONCE(1);                                        \
 263                 return TRACE_TYPE_UNHANDLED;                            \
 264         }                                                               \
 265                                                                         \
 266         field = (typeof(field))entry;                                   \
 267                                                                         \
 268         p = &get_cpu_var(ftrace_event_seq);                             \
 269         trace_seq_init(p);                                              \
 270         ret = trace_seq_printf(s, "%s: ", #call);                       \
 271         if (ret)                                                        \
 272                 ret = trace_seq_printf(s, print);                       \
 273         put_cpu();                                                      \
 274         if (!ret)                                                       \
 275                 return TRACE_TYPE_PARTIAL_LINE;                         \
 276                                                                         \
 277         return TRACE_TYPE_HANDLED;                                      \
 278 }
 279
 280 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 281
 282 #undef __field_ext
 283 #define __field_ext(type, item, filter_type)                            \
 284         ret = trace_define_field(event_call, #type, #item,              \
 285                                  offsetof(typeof(field), item),         \
 286                                  sizeof(field.item),                    \
 287                                  is_signed_type(type), filter_type);    \
 288         if (ret)                                                        \
 289                 return ret;
 290
 291 #undef __field
 292 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
 293
 294 #undef __array
 295 #define __array(type, item, len)                                        \
 296         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
 297         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
 298                                  offsetof(typeof(field), item),         \
 299                                  sizeof(field.item),                    \
 300                                  is_signed_type(type), FILTER_OTHER);   \
 301         if (ret)                                                        \
 302                 return ret;
 303
 304 #undef __dynamic_array
 305 #define __dynamic_array(type, item, len)                                       \
 306         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 307                                  offsetof(typeof(field), __data_loc_##item),   \
 308                                  sizeof(field.__data_loc_##item),              \
 309                                  is_signed_type(type), FILTER_OTHER);
 310
 311 #undef __string
 312 #define __string(item, src) __dynamic_array(char, item, -1)
 313
 314 #undef DECLARE_EVENT_CLASS
 315 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
 316 static int notrace                                                      \
 317 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
 318 {                                                                       \
 319         struct ftrace_raw_##call field;                                 \
 320         int ret;                                                        \
 321                                                                         \
 322         tstruct;                                                        \
 323                                                                         \
 324         return ret;                                                     \
 325 }
 326
 327 #undef DEFINE_EVENT
 328 #define DEFINE_EVENT(template, name, proto, args)
 329
 330 #undef DEFINE_EVENT_PRINT
 331 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 332         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 333
 334 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 335
 336 /*
 337  * remember the offset of each array from the beginning of the event.
 338  */
 339
 340 #undef __entry
 341 #define __entry entry
 342
 343 #undef __field
 344 #define __field(type, item)
 345
 346 #undef __field_ext
 347 #define __field_ext(type, item, filter_type)
 348
 349 #undef __array
 350 #define __array(type, item, len)
 351
 352 #undef __dynamic_array
 353 #define __dynamic_array(type, item, len)                                \
 354         __data_offsets->item = __data_size +                            \
 355                                offsetof(typeof(*entry), __data);        \
 356         __data_offsets->item |= (len * sizeof(type)) << 16;             \
 357         __data_size += (len) * sizeof(type);
 358
 359 #undef __string
 360 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
 361
 362 #undef DECLARE_EVENT_CLASS
 363 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 364 static inline notrace int ftrace_get_offsets_##call(                    \
 365         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 366 {                                                                       \
 367         int __data_size = 0;                                            \
 368         struct ftrace_raw_##call __maybe_unused *entry;                 \
 369                                                                         \
 370         tstruct;                                                        \
 371                                                                         \
 372         return __data_size;                                             \
 373 }
 374
 375 #undef DEFINE_EVENT
 376 #define DEFINE_EVENT(template, name, proto, args)
 377
 378 #undef DEFINE_EVENT_PRINT
 379 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 380         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 381
 382 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 383
 384 #ifdef CONFIG_PERF_EVENTS
 385
 386 /*
 387  * Generate the functions needed for tracepoint perf_event support.
 388  *
 389  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
 390  *
 391  * static int ftrace_profile_enable_<call>(void)
 392  * {
 393  *      return register_trace_<call>(ftrace_profile_<call>);
 394  * }
 395  *
 396  * static void ftrace_profile_disable_<call>(void)
 397  * {
 398  *      unregister_trace_<call>(ftrace_profile_<call>);
 399  * }
 400  *
 401  */
 402
 403 #undef DECLARE_EVENT_CLASS
 404 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
 405
 406 #undef DEFINE_EVENT
 407 #define DEFINE_EVENT(template, name, proto, args)                       \
 408                                                                         \
 409 static void perf_trace_##name(proto);                                   \
 410                                                                         \
 411 static notrace int                                                      \
 412 perf_trace_enable_##name(struct ftrace_event_call *unused)              \
 413 {                                                                       \
 414         return register_trace_##name(perf_trace_##name);                \
 415 }                                                                       \
 416                                                                         \
 417 static notrace void                                                     \
 418 perf_trace_disable_##name(struct ftrace_event_call *unused)             \
 419 {                                                                       \
 420         unregister_trace_##name(perf_trace_##name);                     \
 421 }
 422
 423 #undef DEFINE_EVENT_PRINT
 424 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 425         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 426
 427 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 428
 429 #endif /* CONFIG_PERF_EVENTS */
 430
 431 /*
 432  * Stage 4 of the trace events.
 433  *
 434  * Override the macros in <trace/trace_events.h> to include the following:
 435  *
 436  * static void ftrace_event_<call>(proto)
 437  * {
 438  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
 439  * }
 440  *
 441  * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
 442  * {
 443  *      return register_trace_<call>(ftrace_event_<call>);
 444  * }
 445  *
 446  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
 447  * {
 448  *      unregister_trace_<call>(ftrace_event_<call>);
 449  * }
 450  *
 451  *
 452  * For those macros defined with TRACE_EVENT:
 453  *
 454  * static struct ftrace_event_call event_<call>;
 455  *
 456  * static void ftrace_raw_event_<call>(proto)
 457  * {
 458  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 459  *      struct ring_buffer_event *event;
 460  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
 461  *      struct ring_buffer *buffer;
 462  *      unsigned long irq_flags;
 463  *      int __data_size;
 464  *      int pc;
 465  *
 466  *      local_save_flags(irq_flags);
 467  *      pc = preempt_count();
 468  *
 469  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 470  *
 471  *      event = trace_current_buffer_lock_reserve(&buffer,
 472  *                                event_<call>.id,
 473  *                                sizeof(*entry) + __data_size,
 474  *                                irq_flags, pc);
 475  *      if (!event)
 476  *              return;
 477  *      entry   = ring_buffer_event_data(event);
 478  *
 479  *      { <assign>; }  <-- Here we assign the entries by the __field and
 480  *                         __array macros.
 481  *
 482  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
 483  *              trace_current_buffer_unlock_commit(buffer,
 484  *                                                 event, irq_flags, pc);
 485  * }
 486  *
 487  * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
 488  * {
 489  *      return register_trace_<call>(ftrace_raw_event_<call>);
 490  * }
 491  *
 492  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
 493  * {
 494  *      unregister_trace_<call>(ftrace_raw_event_<call>);
 495  * }
 496  *
 497  * static struct trace_event ftrace_event_type_<call> = {
 498  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
 499  * };
 500  *
 501  * static const char print_fmt_<call>[] = <TP_printk>;
 502  *
 503  * static struct ftrace_event_call __used
 504  * __attribute__((__aligned__(4)))
 505  * __attribute__((section("_ftrace_events"))) event_<call> = {
 506  *      .name                   = "<call>",
 507  *      .system                 = "<system>",
 508  *      .raw_init               = trace_event_raw_init,
 509  *      .regfunc                = ftrace_reg_event_<call>,
 510  *      .unregfunc              = ftrace_unreg_event_<call>,
 511  *      .print_fmt              = print_fmt_<call>,
 512  *      .define_fields          = ftrace_define_fields_<call>,
 513  * }
 514  *
 515  */
 516
 517 #ifdef CONFIG_PERF_EVENTS
 518
 519 #define _TRACE_PERF_INIT(call)                                          \
 520         .perf_event_enable = perf_trace_enable_##call,                  \
 521         .perf_event_disable = perf_trace_disable_##call,
 522
 523 #else
 524 #define _TRACE_PERF_INIT(call)
 525 #endif /* CONFIG_PERF_EVENTS */
 526
 527 #undef __entry
 528 #define __entry entry
 529
 530 #undef __field
 531 #define __field(type, item)
 532
 533 #undef __array
 534 #define __array(type, item, len)
 535
 536 #undef __dynamic_array
 537 #define __dynamic_array(type, item, len)                                \
 538         __entry->__data_loc_##item = __data_offsets.item;
 539
 540 #undef __string
 541 #define __string(item, src) __dynamic_array(char, item, -1)             \
 542
 543 #undef __assign_str
 544 #define __assign_str(dst, src)                                          \
 545         strcpy(__get_str(dst), src);
 546
 547 #undef TP_fast_assign
 548 #define TP_fast_assign(args...) args
 549
 550 #undef TP_perf_assign
 551 #define TP_perf_assign(args...)
 552
 553 #undef DECLARE_EVENT_CLASS
 554 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 555                                                                         \
 556 static notrace void                                                     \
 557 ftrace_raw_event_id_##call(struct ftrace_event_call *event_call,        \
 558                                        proto)                           \
 559 {                                                                       \
 560         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 561         struct ring_buffer_event *event;                                \
 562         struct ftrace_raw_##call *entry;                                \
 563         struct ring_buffer *buffer;                                     \
 564         unsigned long irq_flags;                                        \
 565         int __data_size;                                                \
 566         int pc;                                                         \
 567                                                                         \
 568         local_save_flags(irq_flags);                                    \
 569         pc = preempt_count();                                           \
 570                                                                         \
 571         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 572                                                                         \
 573         event = trace_current_buffer_lock_reserve(&buffer,              \
 574                                  event_call->id,                        \
 575                                  sizeof(*entry) + __data_size,          \
 576                                  irq_flags, pc);                        \
 577         if (!event)                                                     \
 578                 return;                                                 \
 579         entry   = ring_buffer_event_data(event);                        \
 580                                                                         \
 581         tstruct                                                         \
 582                                                                         \
 583         { assign; }                                                     \
 584                                                                         \
 585         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 586                 trace_nowake_buffer_unlock_commit(buffer,               \
 587                                                   event, irq_flags, pc); \
 588 }
 589
 590 #undef DEFINE_EVENT
 591 #define DEFINE_EVENT(template, call, proto, args)                       \
 592                                                                         \
 593 static notrace void ftrace_raw_event_##call(proto)                      \
 594 {                                                                       \
 595         ftrace_raw_event_id_##template(&event_##call, args);            \
 596 }                                                                       \
 597                                                                         \
 598 static notrace int                                                      \
 599 ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)           \
 600 {                                                                       \
 601         return register_trace_##call(ftrace_raw_event_##call);          \
 602 }                                                                       \
 603                                                                         \
 604 static notrace void                                                     \
 605 ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)         \
 606 {                                                                       \
 607         unregister_trace_##call(ftrace_raw_event_##call);               \
 608 }                                                                       \
 609                                                                         \
 610 static struct trace_event ftrace_event_type_##call = {                  \
 611         .trace                  = ftrace_raw_output_##call,             \
 612 };
 613
 614 #undef DEFINE_EVENT_PRINT
 615 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 616         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 617
 618 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 619
 620 #undef __entry
 621 #define __entry REC
 622
 623 #undef __print_flags
 624 #undef __print_symbolic
 625 #undef __get_dynamic_array
 626 #undef __get_str
 627
 628 #undef TP_printk
 629 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
 630
 631 #undef DECLARE_EVENT_CLASS
 632 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 633 static const char print_fmt_##call[] = print;
 634
 635 #undef DEFINE_EVENT
 636 #define DEFINE_EVENT(template, call, proto, args)                       \
 637                                                                         \
 638 static struct ftrace_event_call __used                                  \
 639 __attribute__((__aligned__(4)))                                         \
 640 __attribute__((section("_ftrace_events"))) event_##call = {             \
 641         .name                   = #call,                                \
 642         .system                 = __stringify(TRACE_SYSTEM),            \
 643         .event                  = &ftrace_event_type_##call,            \
 644         .raw_init               = trace_event_raw_init,                 \
 645         .regfunc                = ftrace_raw_reg_event_##call,          \
 646         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 647         .print_fmt              = print_fmt_##template,                 \
 648         .define_fields          = ftrace_define_fields_##template,      \
 649         _TRACE_PERF_INIT(call)                                  \
 650 }
 651
 652 #undef DEFINE_EVENT_PRINT
 653 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
 654                                                                         \
 655 static const char print_fmt_##call[] = print;                           \
 656                                                                         \
 657 static struct ftrace_event_call __used                                  \
 658 __attribute__((__aligned__(4)))                                         \
 659 __attribute__((section("_ftrace_events"))) event_##call = {             \
 660         .name                   = #call,                                \
 661         .system                 = __stringify(TRACE_SYSTEM),            \
 662         .event                  = &ftrace_event_type_##call,            \
 663         .raw_init               = trace_event_raw_init,                 \
 664         .regfunc                = ftrace_raw_reg_event_##call,          \
 665         .unregfunc              = ftrace_raw_unreg_event_##call,        \
 666         .print_fmt              = print_fmt_##call,                     \
 667         .define_fields          = ftrace_define_fields_##template,      \
 668         _TRACE_PERF_INIT(call)                                  \
 669 }
 670
 671 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 672
 673 /*
 674  * Define the insertion callback to perf events
 675  *
 676  * The job is very similar to ftrace_raw_event_<call> except that we don't
 677  * insert in the ring buffer but in a perf counter.
 678  *
 679  * static void ftrace_perf_<call>(proto)
 680  * {
 681  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
 682  *      struct ftrace_event_call *event_call = &event_<call>;
 683  *      extern void perf_tp_event(int, u64, u64, void *, int);
 684  *      struct ftrace_raw_##call *entry;
 685  *      struct perf_trace_buf *trace_buf;
 686  *      u64 __addr = 0, __count = 1;
 687  *      unsigned long irq_flags;
 688  *      struct trace_entry *ent;
 689  *      int __entry_size;
 690  *      int __data_size;
 691  *      int __cpu
 692  *      int pc;
 693  *
 694  *      pc = preempt_count();
 695  *
 696  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
 697  *
 698  *      // Below we want to get the aligned size by taking into account
 699  *      // the u32 field that will later store the buffer size
 700  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
 701  *                           sizeof(u64));
 702  *      __entry_size -= sizeof(u32);
 703  *
 704  *      // Protect the non nmi buffer
 705  *      // This also protects the rcu read side
 706  *      local_irq_save(irq_flags);
 707  *      __cpu = smp_processor_id();
 708  *
 709  *      if (in_nmi())
 710  *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
 711  *      else
 712  *              trace_buf = rcu_dereference_sched(perf_trace_buf);
 713  *
 714  *      if (!trace_buf)
 715  *              goto end;
 716  *
 717  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
 718  *
 719  *      // Avoid recursion from perf that could mess up the buffer
 720  *      if (trace_buf->recursion++)
 721  *              goto end_recursion;
 722  *
 723  *      raw_data = trace_buf->buf;
 724  *
 725  *      // Make recursion update visible before entering perf_tp_event
 726  *      // so that we protect from perf recursions.
 727  *
 728  *      barrier();
 729  *
 730  *      //zero dead bytes from alignment to avoid stack leak to userspace:
 731  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
 732  *      entry = (struct ftrace_raw_<call> *)raw_data;
 733  *      ent = &entry->ent;
 734  *      tracing_generic_entry_update(ent, irq_flags, pc);
 735  *      ent->type = event_call->id;
 736  *
 737  *      <tstruct> <- do some jobs with dynamic arrays
 738  *
 739  *      <assign>  <- affect our values
 740  *
 741  *      perf_tp_event(event_call->id, __addr, __count, entry,
 742  *                   __entry_size);  <- submit them to perf counter
 743  *
 744  * }
 745  */
 746
 747 #ifdef CONFIG_PERF_EVENTS
 748
 749 #undef __entry
 750 #define __entry entry
 751
 752 #undef __get_dynamic_array
 753 #define __get_dynamic_array(field)      \
 754                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
 755
 756 #undef __get_str
 757 #define __get_str(field) (char *)__get_dynamic_array(field)
 758
 759 #undef __perf_addr
 760 #define __perf_addr(a) __addr = (a)
 761
 762 #undef __perf_count
 763 #define __perf_count(c) __count = (c)
 764
 765 #undef DECLARE_EVENT_CLASS
 766 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
 767 static notrace void                                                     \
 768 perf_trace_templ_##call(struct ftrace_event_call *event_call,           \
 769                         struct pt_regs *__regs, proto)                  \
 770 {                                                                       \
 771         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 772         struct ftrace_raw_##call *entry;                                \
 773         u64 __addr = 0, __count = 1;                                    \
 774         unsigned long irq_flags;                                        \
 775         int __entry_size;                                               \
 776         int __data_size;                                                \
 777         int rctx;                                                       \
 778                                                                         \
 779         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 780         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 781                              sizeof(u64));                              \
 782         __entry_size -= sizeof(u32);                                    \
 783                                                                         \
 784         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
 785                       "profile buffer not large enough"))               \
 786                 return;                                                 \
 787         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
 788                 __entry_size, event_call->id, &rctx, &irq_flags);       \
 789         if (!entry)                                                     \
 790                 return;                                                 \
 791         tstruct                                                         \
 792                                                                         \
 793         { assign; }                                                     \
 794                                                                         \
 795         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
 796                                __count, irq_flags, __regs);             \
 797 }
 798
 799 #undef DEFINE_EVENT
 800 #define DEFINE_EVENT(template, call, proto, args)                       \
 801 static notrace void perf_trace_##call(proto)                            \
 802 {                                                                       \
 803         struct ftrace_event_call *event_call = &event_##call;           \
 804         struct pt_regs *__regs = &get_cpu_var(perf_trace_regs);         \
 805                                                                         \
 806         perf_fetch_caller_regs(__regs, 1);                              \
 807                                                                         \
 808         perf_trace_templ_##template(event_call, __regs, args);          \
 809                                                                         \
 810         put_cpu_var(perf_trace_regs);                                   \
 811 }
 812
 813 #undef DEFINE_EVENT_PRINT
 814 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 815         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 816
 817 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 818 #endif /* CONFIG_PERF_EVENTS */
 819
 820 #undef _TRACE_PROFILE_INIT
 821