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TOMOYO Linux Cross Reference
Linux/include/trace/ftrace.h

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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                                                                         \
 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_FN
 75 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)        \
 76         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 77 
 78 #undef DEFINE_EVENT_PRINT
 79 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
 80         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
 81 
 82 /* Callbacks are meaningless to ftrace. */
 83 #undef TRACE_EVENT_FN
 84 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
 85                 assign, print, reg, unreg)                              \
 86         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
 87                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
 88 
 89 #undef TRACE_EVENT_FLAGS
 90 #define TRACE_EVENT_FLAGS(name, value)                                  \
 91         __TRACE_EVENT_FLAGS(name, value)
 92 
 93 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 94 
 95 
 96 /*
 97  * Stage 2 of the trace events.
 98  *
 99  * Include the following:
100  *
101  * struct ftrace_data_offsets_<call> {
102  *      u32                             <item1>;
103  *      u32                             <item2>;
104  *      [...]
105  * };
106  *
107  * The __dynamic_array() macro will create each u32 <item>, this is
108  * to keep the offset of each array from the beginning of the event.
109  * The size of an array is also encoded, in the higher 16 bits of <item>.
110  */
111 
112 #undef __field
113 #define __field(type, item)
114 
115 #undef __field_ext
116 #define __field_ext(type, item, filter_type)
117 
118 #undef __array
119 #define __array(type, item, len)
120 
121 #undef __dynamic_array
122 #define __dynamic_array(type, item, len)        u32 item;
123 
124 #undef __string
125 #define __string(item, src) __dynamic_array(char, item, -1)
126 
127 #undef DECLARE_EVENT_CLASS
128 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
129         struct ftrace_data_offsets_##call {                             \
130                 tstruct;                                                \
131         };
132 
133 #undef DEFINE_EVENT
134 #define DEFINE_EVENT(template, name, proto, args)
135 
136 #undef DEFINE_EVENT_PRINT
137 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
138         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
139 
140 #undef TRACE_EVENT_FLAGS
141 #define TRACE_EVENT_FLAGS(event, flag)
142 
143 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
144 
145 /*
146  * Stage 3 of the trace events.
147  *
148  * Override the macros in <trace/trace_events.h> to include the following:
149  *
150  * enum print_line_t
151  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
152  * {
153  *      struct trace_seq *s = &iter->seq;
154  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
155  *      struct trace_entry *entry;
156  *      struct trace_seq *p = &iter->tmp_seq;
157  *      int ret;
158  *
159  *      entry = iter->ent;
160  *
161  *      if (entry->type != event_<call>->event.type) {
162  *              WARN_ON_ONCE(1);
163  *              return TRACE_TYPE_UNHANDLED;
164  *      }
165  *
166  *      field = (typeof(field))entry;
167  *
168  *      trace_seq_init(p);
169  *      ret = trace_seq_printf(s, "%s: ", <call>);
170  *      if (ret)
171  *              ret = trace_seq_printf(s, <TP_printk> "\n");
172  *      if (!ret)
173  *              return TRACE_TYPE_PARTIAL_LINE;
174  *
175  *      return TRACE_TYPE_HANDLED;
176  * }
177  *
178  * This is the method used to print the raw event to the trace
179  * output format. Note, this is not needed if the data is read
180  * in binary.
181  */
182 
183 #undef __entry
184 #define __entry field
185 
186 #undef TP_printk
187 #define TP_printk(fmt, args...) fmt "\n", args
188 
189 #undef __get_dynamic_array
190 #define __get_dynamic_array(field)      \
191                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
192 
193 #undef __get_str
194 #define __get_str(field) (char *)__get_dynamic_array(field)
195 
196 #undef __print_flags
197 #define __print_flags(flag, delim, flag_array...)                       \
198         ({                                                              \
199                 static const struct trace_print_flags __flags[] =       \
200                         { flag_array, { -1, NULL }};                    \
201                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
202         })
203 
204 #undef __print_symbolic
205 #define __print_symbolic(value, symbol_array...)                        \
206         ({                                                              \
207                 static const struct trace_print_flags symbols[] =       \
208                         { symbol_array, { -1, NULL }};                  \
209                 ftrace_print_symbols_seq(p, value, symbols);            \
210         })
211 
212 #undef __print_symbolic_u64
213 #if BITS_PER_LONG == 32
214 #define __print_symbolic_u64(value, symbol_array...)                    \
215         ({                                                              \
216                 static const struct trace_print_flags_u64 symbols[] =   \
217                         { symbol_array, { -1, NULL } };                 \
218                 ftrace_print_symbols_seq_u64(p, value, symbols);        \
219         })
220 #else
221 #define __print_symbolic_u64(value, symbol_array...)                    \
222                         __print_symbolic(value, symbol_array)
223 #endif
224 
225 #undef __print_hex
226 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
227 
228 #undef DECLARE_EVENT_CLASS
229 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
230 static notrace enum print_line_t                                        \
231 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
232                          struct trace_event *trace_event)               \
233 {                                                                       \
234         struct trace_seq *s = &iter->seq;                               \
235         struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
236         struct ftrace_raw_##call *field;                                \
237         int ret;                                                        \
238                                                                         \
239         field = (typeof(field))iter->ent;                               \
240                                                                         \
241         ret = ftrace_raw_output_prep(iter, trace_event);                \
242         if (ret)                                                        \
243                 return ret;                                             \
244                                                                         \
245         ret = trace_seq_printf(s, print);                               \
246         if (!ret)                                                       \
247                 return TRACE_TYPE_PARTIAL_LINE;                         \
248                                                                         \
249         return TRACE_TYPE_HANDLED;                                      \
250 }                                                                       \
251 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
252         .trace                  = ftrace_raw_output_##call,             \
253 };
254 
255 #undef DEFINE_EVENT_PRINT
256 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
257 static notrace enum print_line_t                                        \
258 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
259                          struct trace_event *event)                     \
260 {                                                                       \
261         struct trace_seq *s = &iter->seq;                               \
262         struct ftrace_raw_##template *field;                            \
263         struct trace_entry *entry;                                      \
264         struct trace_seq *p = &iter->tmp_seq;                           \
265         int ret;                                                        \
266                                                                         \
267         entry = iter->ent;                                              \
268                                                                         \
269         if (entry->type != event_##call.event.type) {                   \
270                 WARN_ON_ONCE(1);                                        \
271                 return TRACE_TYPE_UNHANDLED;                            \
272         }                                                               \
273                                                                         \
274         field = (typeof(field))entry;                                   \
275                                                                         \
276         trace_seq_init(p);                                              \
277         ret = trace_seq_printf(s, "%s: ", #call);                       \
278         if (ret)                                                        \
279                 ret = trace_seq_printf(s, print);                       \
280         if (!ret)                                                       \
281                 return TRACE_TYPE_PARTIAL_LINE;                         \
282                                                                         \
283         return TRACE_TYPE_HANDLED;                                      \
284 }                                                                       \
285 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
286         .trace                  = ftrace_raw_output_##call,             \
287 };
288 
289 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
290 
291 #undef __field_ext
292 #define __field_ext(type, item, filter_type)                            \
293         ret = trace_define_field(event_call, #type, #item,              \
294                                  offsetof(typeof(field), item),         \
295                                  sizeof(field.item),                    \
296                                  is_signed_type(type), filter_type);    \
297         if (ret)                                                        \
298                 return ret;
299 
300 #undef __field
301 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
302 
303 #undef __array
304 #define __array(type, item, len)                                        \
305         do {                                                            \
306                 mutex_lock(&event_storage_mutex);                       \
307                 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                 \
308                 snprintf(event_storage, sizeof(event_storage),          \
309                          "%s[%d]", #type, len);                         \
310                 ret = trace_define_field(event_call, event_storage, #item, \
311                                  offsetof(typeof(field), item),         \
312                                  sizeof(field.item),                    \
313                                  is_signed_type(type), FILTER_OTHER);   \
314                 mutex_unlock(&event_storage_mutex);                     \
315                 if (ret)                                                \
316                         return ret;                                     \
317         } while (0);
318 
319 #undef __dynamic_array
320 #define __dynamic_array(type, item, len)                                       \
321         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
322                                  offsetof(typeof(field), __data_loc_##item),   \
323                                  sizeof(field.__data_loc_##item),              \
324                                  is_signed_type(type), FILTER_OTHER);
325 
326 #undef __string
327 #define __string(item, src) __dynamic_array(char, item, -1)
328 
329 #undef DECLARE_EVENT_CLASS
330 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
331 static int notrace __init                                               \
332 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
333 {                                                                       \
334         struct ftrace_raw_##call field;                                 \
335         int ret;                                                        \
336                                                                         \
337         tstruct;                                                        \
338                                                                         \
339         return ret;                                                     \
340 }
341 
342 #undef DEFINE_EVENT
343 #define DEFINE_EVENT(template, name, proto, args)
344 
345 #undef DEFINE_EVENT_PRINT
346 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
347         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
348 
349 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
350 
351 /*
352  * remember the offset of each array from the beginning of the event.
353  */
354 
355 #undef __entry
356 #define __entry entry
357 
358 #undef __field
359 #define __field(type, item)
360 
361 #undef __field_ext
362 #define __field_ext(type, item, filter_type)
363 
364 #undef __array
365 #define __array(type, item, len)
366 
367 #undef __dynamic_array
368 #define __dynamic_array(type, item, len)                                \
369         __data_offsets->item = __data_size +                            \
370                                offsetof(typeof(*entry), __data);        \
371         __data_offsets->item |= (len * sizeof(type)) << 16;             \
372         __data_size += (len) * sizeof(type);
373 
374 #undef __string
375 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
376 
377 #undef DECLARE_EVENT_CLASS
378 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
379 static inline notrace int ftrace_get_offsets_##call(                    \
380         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
381 {                                                                       \
382         int __data_size = 0;                                            \
383         struct ftrace_raw_##call __maybe_unused *entry;                 \
384                                                                         \
385         tstruct;                                                        \
386                                                                         \
387         return __data_size;                                             \
388 }
389 
390 #undef DEFINE_EVENT
391 #define DEFINE_EVENT(template, name, proto, args)
392 
393 #undef DEFINE_EVENT_PRINT
394 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
395         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
396 
397 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
398 
399 /*
400  * Stage 4 of the trace events.
401  *
402  * Override the macros in <trace/trace_events.h> to include the following:
403  *
404  * For those macros defined with TRACE_EVENT:
405  *
406  * static struct ftrace_event_call event_<call>;
407  *
408  * static void ftrace_raw_event_<call>(void *__data, proto)
409  * {
410  *      struct ftrace_event_file *ftrace_file = __data;
411  *      struct ftrace_event_call *event_call = ftrace_file->event_call;
412  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
413  *      struct ring_buffer_event *event;
414  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
415  *      struct ring_buffer *buffer;
416  *      unsigned long irq_flags;
417  *      int __data_size;
418  *      int pc;
419  *
420  *      if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
421  *                   &ftrace_file->flags))
422  *              return;
423  *
424  *      local_save_flags(irq_flags);
425  *      pc = preempt_count();
426  *
427  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
428  *
429  *      event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
430  *                                event_<call>->event.type,
431  *                                sizeof(*entry) + __data_size,
432  *                                irq_flags, pc);
433  *      if (!event)
434  *              return;
435  *      entry   = ring_buffer_event_data(event);
436  *
437  *      { <assign>; }  <-- Here we assign the entries by the __field and
438  *                         __array macros.
439  *
440  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
441  *              trace_nowake_buffer_unlock_commit(buffer,
442  *                                                 event, irq_flags, pc);
443  * }
444  *
445  * static struct trace_event ftrace_event_type_<call> = {
446  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
447  * };
448  *
449  * static const char print_fmt_<call>[] = <TP_printk>;
450  *
451  * static struct ftrace_event_class __used event_class_<template> = {
452  *      .system                 = "<system>",
453  *      .define_fields          = ftrace_define_fields_<call>,
454  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
455  *      .raw_init               = trace_event_raw_init,
456  *      .probe                  = ftrace_raw_event_##call,
457  *      .reg                    = ftrace_event_reg,
458  * };
459  *
460  * static struct ftrace_event_call event_<call> = {
461  *      .name                   = "<call>",
462  *      .class                  = event_class_<template>,
463  *      .event                  = &ftrace_event_type_<call>,
464  *      .print_fmt              = print_fmt_<call>,
465  * };
466  * // its only safe to use pointers when doing linker tricks to
467  * // create an array.
468  * static struct ftrace_event_call __used
469  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
470  *
471  */
472 
473 #ifdef CONFIG_PERF_EVENTS
474 
475 #define _TRACE_PERF_PROTO(call, proto)                                  \
476         static notrace void                                             \
477         perf_trace_##call(void *__data, proto);
478 
479 #define _TRACE_PERF_INIT(call)                                          \
480         .perf_probe             = perf_trace_##call,
481 
482 #else
483 #define _TRACE_PERF_PROTO(call, proto)
484 #define _TRACE_PERF_INIT(call)
485 #endif /* CONFIG_PERF_EVENTS */
486 
487 #undef __entry
488 #define __entry entry
489 
490 #undef __field
491 #define __field(type, item)
492 
493 #undef __array
494 #define __array(type, item, len)
495 
496 #undef __dynamic_array
497 #define __dynamic_array(type, item, len)                                \
498         __entry->__data_loc_##item = __data_offsets.item;
499 
500 #undef __string
501 #define __string(item, src) __dynamic_array(char, item, -1)             \
502 
503 #undef __assign_str
504 #define __assign_str(dst, src)                                          \
505         strcpy(__get_str(dst), src);
506 
507 #undef TP_fast_assign
508 #define TP_fast_assign(args...) args
509 
510 #undef TP_perf_assign
511 #define TP_perf_assign(args...)
512 
513 #undef DECLARE_EVENT_CLASS
514 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
515                                                                         \
516 static notrace void                                                     \
517 ftrace_raw_event_##call(void *__data, proto)                            \
518 {                                                                       \
519         struct ftrace_event_file *ftrace_file = __data;                 \
520         struct ftrace_event_call *event_call = ftrace_file->event_call; \
521         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
522         struct ring_buffer_event *event;                                \
523         struct ftrace_raw_##call *entry;                                \
524         struct ring_buffer *buffer;                                     \
525         unsigned long irq_flags;                                        \
526         int __data_size;                                                \
527         int pc;                                                         \
528                                                                         \
529         if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,                 \
530                      &ftrace_file->flags))                              \
531                 return;                                                 \
532                                                                         \
533         local_save_flags(irq_flags);                                    \
534         pc = preempt_count();                                           \
535                                                                         \
536         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
537                                                                         \
538         event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,   \
539                                  event_call->event.type,                \
540                                  sizeof(*entry) + __data_size,          \
541                                  irq_flags, pc);                        \
542         if (!event)                                                     \
543                 return;                                                 \
544         entry   = ring_buffer_event_data(event);                        \
545                                                                         \
546         tstruct                                                         \
547                                                                         \
548         { assign; }                                                     \
549                                                                         \
550         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
551                 trace_buffer_unlock_commit(buffer, event, irq_flags, pc); \
552 }
553 /*
554  * The ftrace_test_probe is compiled out, it is only here as a build time check
555  * to make sure that if the tracepoint handling changes, the ftrace probe will
556  * fail to compile unless it too is updated.
557  */
558 
559 #undef DEFINE_EVENT
560 #define DEFINE_EVENT(template, call, proto, args)                       \
561 static inline void ftrace_test_probe_##call(void)                       \
562 {                                                                       \
563         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
564 }
565 
566 #undef DEFINE_EVENT_PRINT
567 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
568 
569 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
570 
571 #undef __entry
572 #define __entry REC
573 
574 #undef __print_flags
575 #undef __print_symbolic
576 #undef __print_hex
577 #undef __get_dynamic_array
578 #undef __get_str
579 
580 #undef TP_printk
581 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
582 
583 #undef DECLARE_EVENT_CLASS
584 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
585 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
586 static const char print_fmt_##call[] = print;                           \
587 static struct ftrace_event_class __used __refdata event_class_##call = { \
588         .system                 = __stringify(TRACE_SYSTEM),            \
589         .define_fields          = ftrace_define_fields_##call,          \
590         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
591         .raw_init               = trace_event_raw_init,                 \
592         .probe                  = ftrace_raw_event_##call,              \
593         .reg                    = ftrace_event_reg,                     \
594         _TRACE_PERF_INIT(call)                                          \
595 };
596 
597 #undef DEFINE_EVENT
598 #define DEFINE_EVENT(template, call, proto, args)                       \
599                                                                         \
600 static struct ftrace_event_call __used event_##call = {                 \
601         .name                   = #call,                                \
602         .class                  = &event_class_##template,              \
603         .event.funcs            = &ftrace_event_type_funcs_##template,  \
604         .print_fmt              = print_fmt_##template,                 \
605 };                                                                      \
606 static struct ftrace_event_call __used                                  \
607 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
608 
609 #undef DEFINE_EVENT_PRINT
610 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
611                                                                         \
612 static const char print_fmt_##call[] = print;                           \
613                                                                         \
614 static struct ftrace_event_call __used event_##call = {                 \
615         .name                   = #call,                                \
616         .class                  = &event_class_##template,              \
617         .event.funcs            = &ftrace_event_type_funcs_##call,      \
618         .print_fmt              = print_fmt_##call,                     \
619 };                                                                      \
620 static struct ftrace_event_call __used                                  \
621 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
622 
623 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
624 
625 
626 #ifdef CONFIG_PERF_EVENTS
627 
628 #undef __entry
629 #define __entry entry
630 
631 #undef __get_dynamic_array
632 #define __get_dynamic_array(field)      \
633                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
634 
635 #undef __get_str
636 #define __get_str(field) (char *)__get_dynamic_array(field)
637 
638 #undef __perf_addr
639 #define __perf_addr(a) __addr = (a)
640 
641 #undef __perf_count
642 #define __perf_count(c) __count = (c)
643 
644 #undef __perf_task
645 #define __perf_task(t) __task = (t)
646 
647 #undef TP_perf_assign
648 #define TP_perf_assign(args...) args
649 
650 #undef DECLARE_EVENT_CLASS
651 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
652 static notrace void                                                     \
653 perf_trace_##call(void *__data, proto)                                  \
654 {                                                                       \
655         struct ftrace_event_call *event_call = __data;                  \
656         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
657         struct ftrace_raw_##call *entry;                                \
658         struct pt_regs __regs;                                          \
659         u64 __addr = 0, __count = 1;                                    \
660         struct task_struct *__task = NULL;                              \
661         struct hlist_head *head;                                        \
662         int __entry_size;                                               \
663         int __data_size;                                                \
664         int rctx;                                                       \
665                                                                         \
666         perf_fetch_caller_regs(&__regs);                                \
667                                                                         \
668         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
669         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
670                              sizeof(u64));                              \
671         __entry_size -= sizeof(u32);                                    \
672                                                                         \
673         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
674                 __entry_size, event_call->event.type, &__regs, &rctx);  \
675         if (!entry)                                                     \
676                 return;                                                 \
677                                                                         \
678         tstruct                                                         \
679                                                                         \
680         { assign; }                                                     \
681                                                                         \
682         head = this_cpu_ptr(event_call->perf_events);                   \
683         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
684                 __count, &__regs, head, __task);                        \
685 }
686 
687 /*
688  * This part is compiled out, it is only here as a build time check
689  * to make sure that if the tracepoint handling changes, the
690  * perf probe will fail to compile unless it too is updated.
691  */
692 #undef DEFINE_EVENT
693 #define DEFINE_EVENT(template, call, proto, args)                       \
694 static inline void perf_test_probe_##call(void)                         \
695 {                                                                       \
696         check_trace_callback_type_##call(perf_trace_##template);        \
697 }
698 
699 
700 #undef DEFINE_EVENT_PRINT
701 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
702         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
703 
704 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
705 #endif /* CONFIG_PERF_EVENTS */
706 
707 

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