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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_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, strlen(src) + 1)
383 
384 #undef DECLARE_EVENT_CLASS
385 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
386 static inline notrace int ftrace_get_offsets_##call(                    \
387         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
388 {                                                                       \
389         int __data_size = 0;                                            \
390         struct ftrace_raw_##call __maybe_unused *entry;                 \
391                                                                         \
392         tstruct;                                                        \
393                                                                         \
394         return __data_size;                                             \
395 }
396 
397 #undef DEFINE_EVENT
398 #define DEFINE_EVENT(template, name, proto, args)
399 
400 #undef DEFINE_EVENT_PRINT
401 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
402         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
403 
404 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
405 
406 /*
407  * Stage 4 of the trace events.
408  *
409  * Override the macros in <trace/trace_events.h> to include the following:
410  *
411  * For those macros defined with TRACE_EVENT:
412  *
413  * static struct ftrace_event_call event_<call>;
414  *
415  * static void ftrace_raw_event_<call>(void *__data, proto)
416  * {
417  *      struct ftrace_event_call *event_call = __data;
418  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
419  *      struct ring_buffer_event *event;
420  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
421  *      struct ring_buffer *buffer;
422  *      unsigned long irq_flags;
423  *      int __data_size;
424  *      int pc;
425  *
426  *      local_save_flags(irq_flags);
427  *      pc = preempt_count();
428  *
429  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
430  *
431  *      event = trace_current_buffer_lock_reserve(&buffer,
432  *                                event_<call>->event.type,
433  *                                sizeof(*entry) + __data_size,
434  *                                irq_flags, pc);
435  *      if (!event)
436  *              return;
437  *      entry   = ring_buffer_event_data(event);
438  *
439  *      { <assign>; }  <-- Here we assign the entries by the __field and
440  *                         __array macros.
441  *
442  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
443  *              trace_current_buffer_unlock_commit(buffer,
444  *                                                 event, irq_flags, pc);
445  * }
446  *
447  * static struct trace_event ftrace_event_type_<call> = {
448  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
449  * };
450  *
451  * static const char print_fmt_<call>[] = <TP_printk>;
452  *
453  * static struct ftrace_event_class __used event_class_<template> = {
454  *      .system                 = "<system>",
455  *      .define_fields          = ftrace_define_fields_<call>,
456  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
457  *      .raw_init               = trace_event_raw_init,
458  *      .probe                  = ftrace_raw_event_##call,
459  *      .reg                    = ftrace_event_reg,
460  * };
461  *
462  * static struct ftrace_event_call event_<call> = {
463  *      .name                   = "<call>",
464  *      .class                  = event_class_<template>,
465  *      .event                  = &ftrace_event_type_<call>,
466  *      .print_fmt              = print_fmt_<call>,
467  * };
468  * // its only safe to use pointers when doing linker tricks to
469  * // create an array.
470  * static struct ftrace_event_call __used
471  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
472  *
473  */
474 
475 #ifdef CONFIG_PERF_EVENTS
476 
477 #define _TRACE_PERF_PROTO(call, proto)                                  \
478         static notrace void                                             \
479         perf_trace_##call(void *__data, proto);
480 
481 #define _TRACE_PERF_INIT(call)                                          \
482         .perf_probe             = perf_trace_##call,
483 
484 #else
485 #define _TRACE_PERF_PROTO(call, proto)
486 #define _TRACE_PERF_INIT(call)
487 #endif /* CONFIG_PERF_EVENTS */
488 
489 #undef __entry
490 #define __entry entry
491 
492 #undef __field
493 #define __field(type, item)
494 
495 #undef __array
496 #define __array(type, item, len)
497 
498 #undef __dynamic_array
499 #define __dynamic_array(type, item, len)                                \
500         __entry->__data_loc_##item = __data_offsets.item;
501 
502 #undef __string
503 #define __string(item, src) __dynamic_array(char, item, -1)             \
504 
505 #undef __assign_str
506 #define __assign_str(dst, src)                                          \
507         strcpy(__get_str(dst), src);
508 
509 #undef TP_fast_assign
510 #define TP_fast_assign(args...) args
511 
512 #undef TP_perf_assign
513 #define TP_perf_assign(args...)
514 
515 #undef DECLARE_EVENT_CLASS
516 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
517                                                                         \
518 static notrace void                                                     \
519 ftrace_raw_event_##call(void *__data, proto)                            \
520 {                                                                       \
521         struct ftrace_event_call *event_call = __data;                  \
522         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
523         struct ring_buffer_event *event;                                \
524         struct ftrace_raw_##call *entry;                                \
525         struct ring_buffer *buffer;                                     \
526         unsigned long irq_flags;                                        \
527         int __data_size;                                                \
528         int pc;                                                         \
529                                                                         \
530         local_save_flags(irq_flags);                                    \
531         pc = preempt_count();                                           \
532                                                                         \
533         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
534                                                                         \
535         event = trace_current_buffer_lock_reserve(&buffer,              \
536                                  event_call->event.type,                \
537                                  sizeof(*entry) + __data_size,          \
538                                  irq_flags, pc);                        \
539         if (!event)                                                     \
540                 return;                                                 \
541         entry   = ring_buffer_event_data(event);                        \
542                                                                         \
543         tstruct                                                         \
544                                                                         \
545         { assign; }                                                     \
546                                                                         \
547         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
548                 trace_nowake_buffer_unlock_commit(buffer,               \
549                                                   event, irq_flags, pc); \
550 }
551 /*
552  * The ftrace_test_probe is compiled out, it is only here as a build time check
553  * to make sure that if the tracepoint handling changes, the ftrace probe will
554  * fail to compile unless it too is updated.
555  */
556 
557 #undef DEFINE_EVENT
558 #define DEFINE_EVENT(template, call, proto, args)                       \
559 static inline void ftrace_test_probe_##call(void)                       \
560 {                                                                       \
561         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
562 }
563 
564 #undef DEFINE_EVENT_PRINT
565 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
566 
567 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
568 
569 #undef __entry
570 #define __entry REC
571 
572 #undef __print_flags
573 #undef __print_symbolic
574 #undef __get_dynamic_array
575 #undef __get_str
576 
577 #undef TP_printk
578 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
579 
580 #undef DECLARE_EVENT_CLASS
581 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
582 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
583 static const char print_fmt_##call[] = print;                           \
584 static struct ftrace_event_class __used event_class_##call = {          \
585         .system                 = __stringify(TRACE_SYSTEM),            \
586         .define_fields          = ftrace_define_fields_##call,          \
587         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
588         .raw_init               = trace_event_raw_init,                 \
589         .probe                  = ftrace_raw_event_##call,              \
590         .reg                    = ftrace_event_reg,                     \
591         _TRACE_PERF_INIT(call)                                          \
592 };
593 
594 #undef DEFINE_EVENT
595 #define DEFINE_EVENT(template, call, proto, args)                       \
596                                                                         \
597 static struct ftrace_event_call __used event_##call = {                 \
598         .name                   = #call,                                \
599         .class                  = &event_class_##template,              \
600         .event.funcs            = &ftrace_event_type_funcs_##template,  \
601         .print_fmt              = print_fmt_##template,                 \
602 };                                                                      \
603 static struct ftrace_event_call __used                                  \
604 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
605 
606 #undef DEFINE_EVENT_PRINT
607 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
608                                                                         \
609 static const char print_fmt_##call[] = print;                           \
610                                                                         \
611 static struct ftrace_event_call __used event_##call = {                 \
612         .name                   = #call,                                \
613         .class                  = &event_class_##template,              \
614         .event.funcs            = &ftrace_event_type_funcs_##call,      \
615         .print_fmt              = print_fmt_##call,                     \
616 };                                                                      \
617 static struct ftrace_event_call __used                                  \
618 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
619 
620 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
621 
622 /*
623  * Define the insertion callback to perf events
624  *
625  * The job is very similar to ftrace_raw_event_<call> except that we don't
626  * insert in the ring buffer but in a perf counter.
627  *
628  * static void ftrace_perf_<call>(proto)
629  * {
630  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
631  *      struct ftrace_event_call *event_call = &event_<call>;
632  *      extern void perf_tp_event(int, u64, u64, void *, int);
633  *      struct ftrace_raw_##call *entry;
634  *      struct perf_trace_buf *trace_buf;
635  *      u64 __addr = 0, __count = 1;
636  *      unsigned long irq_flags;
637  *      struct trace_entry *ent;
638  *      int __entry_size;
639  *      int __data_size;
640  *      int __cpu
641  *      int pc;
642  *
643  *      pc = preempt_count();
644  *
645  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
646  *
647  *      // Below we want to get the aligned size by taking into account
648  *      // the u32 field that will later store the buffer size
649  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
650  *                           sizeof(u64));
651  *      __entry_size -= sizeof(u32);
652  *
653  *      // Protect the non nmi buffer
654  *      // This also protects the rcu read side
655  *      local_irq_save(irq_flags);
656  *      __cpu = smp_processor_id();
657  *
658  *      if (in_nmi())
659  *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
660  *      else
661  *              trace_buf = rcu_dereference_sched(perf_trace_buf);
662  *
663  *      if (!trace_buf)
664  *              goto end;
665  *
666  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
667  *
668  *      // Avoid recursion from perf that could mess up the buffer
669  *      if (trace_buf->recursion++)
670  *              goto end_recursion;
671  *
672  *      raw_data = trace_buf->buf;
673  *
674  *      // Make recursion update visible before entering perf_tp_event
675  *      // so that we protect from perf recursions.
676  *
677  *      barrier();
678  *
679  *      //zero dead bytes from alignment to avoid stack leak to userspace:
680  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
681  *      entry = (struct ftrace_raw_<call> *)raw_data;
682  *      ent = &entry->ent;
683  *      tracing_generic_entry_update(ent, irq_flags, pc);
684  *      ent->type = event_call->id;
685  *
686  *      <tstruct> <- do some jobs with dynamic arrays
687  *
688  *      <assign>  <- affect our values
689  *
690  *      perf_tp_event(event_call->id, __addr, __count, entry,
691  *                   __entry_size);  <- submit them to perf counter
692  *
693  * }
694  */
695 
696 #ifdef CONFIG_PERF_EVENTS
697 
698 #undef __entry
699 #define __entry entry
700 
701 #undef __get_dynamic_array
702 #define __get_dynamic_array(field)      \
703                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
704 
705 #undef __get_str
706 #define __get_str(field) (char *)__get_dynamic_array(field)
707 
708 #undef __perf_addr
709 #define __perf_addr(a) __addr = (a)
710 
711 #undef __perf_count
712 #define __perf_count(c) __count = (c)
713 
714 #undef DECLARE_EVENT_CLASS
715 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
716 static notrace void                                                     \
717 perf_trace_##call(void *__data, proto)                                  \
718 {                                                                       \
719         struct ftrace_event_call *event_call = __data;                  \
720         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
721         struct ftrace_raw_##call *entry;                                \
722         struct pt_regs __regs;                                          \
723         u64 __addr = 0, __count = 1;                                    \
724         struct hlist_head *head;                                        \
725         int __entry_size;                                               \
726         int __data_size;                                                \
727         int rctx;                                                       \
728                                                                         \
729         perf_fetch_caller_regs(&__regs);                                \
730                                                                         \
731         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
732         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
733                              sizeof(u64));                              \
734         __entry_size -= sizeof(u32);                                    \
735                                                                         \
736         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
737                       "profile buffer not large enough"))               \
738                 return;                                                 \
739                                                                         \
740         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
741                 __entry_size, event_call->event.type, &__regs, &rctx);  \
742         if (!entry)                                                     \
743                 return;                                                 \
744                                                                         \
745         tstruct                                                         \
746                                                                         \
747         { assign; }                                                     \
748                                                                         \
749         head = this_cpu_ptr(event_call->perf_events);                   \
750         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
751                 __count, &__regs, head);                                \
752 }
753 
754 /*
755  * This part is compiled out, it is only here as a build time check
756  * to make sure that if the tracepoint handling changes, the
757  * perf probe will fail to compile unless it too is updated.
758  */
759 #undef DEFINE_EVENT
760 #define DEFINE_EVENT(template, call, proto, args)                       \
761 static inline void perf_test_probe_##call(void)                         \
762 {                                                                       \
763         check_trace_callback_type_##call(perf_trace_##template);        \
764 }
765 
766 
767 #undef DEFINE_EVENT_PRINT
768 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
769         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
770 
771 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
772 #endif /* CONFIG_PERF_EVENTS */
773 
774 #undef _TRACE_PROFILE_INIT
775 
776 

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