fs: cleanup files_lock locking
[linux-2.6.git] / include / trace / ftrace.h
1 /*
2  * Stage 1 of the trace events.
3  *
4  * Override the macros in <trace/trace_events.h> to include the following:
5  *
6  * struct ftrace_raw_<call> {
7  *      struct trace_entry              ent;
8  *      <type>                          <item>;
9  *      <type2>                         <item2>[<len>];
10  *      [...]
11  * };
12  *
13  * The <type> <item> is created by the __field(type, item) macro or
14  * the __array(type2, item2, len) macro.
15  * We simply do "type item;", and that will create the fields
16  * in the structure.
17  */
18
19 #include <linux/ftrace_event.h>
20
21 /*
22  * DECLARE_EVENT_CLASS can be used to add a generic function
23  * handlers for events. That is, if all events have the same
24  * parameters and just have distinct trace points.
25  * Each tracepoint can be defined with DEFINE_EVENT and that
26  * will map the DECLARE_EVENT_CLASS to the tracepoint.
27  *
28  * TRACE_EVENT is a one to one mapping between tracepoint and template.
29  */
30 #undef TRACE_EVENT
31 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
32         DECLARE_EVENT_CLASS(name,                              \
33                              PARAMS(proto),                    \
34                              PARAMS(args),                     \
35                              PARAMS(tstruct),                  \
36                              PARAMS(assign),                   \
37                              PARAMS(print));                   \
38         DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
39
40
41 #undef __field
42 #define __field(type, item)             type    item;
43
44 #undef __field_ext
45 #define __field_ext(type, item, filter_type)    type    item;
46
47 #undef __array
48 #define __array(type, item, len)        type    item[len];
49
50 #undef __dynamic_array
51 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
52
53 #undef __string
54 #define __string(item, src) __dynamic_array(char, item, -1)
55
56 #undef TP_STRUCT__entry
57 #define TP_STRUCT__entry(args...) args
58
59 #undef DECLARE_EVENT_CLASS
60 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)  \
61         struct ftrace_raw_##name {                                      \
62                 struct trace_entry      ent;                            \
63                 tstruct                                                 \
64                 char                    __data[0];                      \
65         };                                                              \
66                                                                         \
67         static struct ftrace_event_class event_class_##name;
68
69 #undef DEFINE_EVENT
70 #define DEFINE_EVENT(template, name, proto, args)       \
71         static struct ftrace_event_call __used          \
72         __attribute__((__aligned__(4))) event_##name
73
74 #undef DEFINE_EVENT_PRINT
75 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
76         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
77
78 /* Callbacks are meaningless to ftrace. */
79 #undef TRACE_EVENT_FN
80 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
81                 assign, print, reg, unreg)                              \
82         TRACE_EVENT(name, PARAMS(proto), PARAMS(args),                  \
83                 PARAMS(tstruct), PARAMS(assign), PARAMS(print))         \
84
85 #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 = &iter->tmp_seq;
146  *      int ret;
147  *
148  *      entry = iter->ent;
149  *
150  *      if (entry->type != event_<call>->event.type) {
151  *              WARN_ON_ONCE(1);
152  *              return TRACE_TYPE_UNHANDLED;
153  *      }
154  *
155  *      field = (typeof(field))entry;
156  *
157  *      trace_seq_init(p);
158  *      ret = trace_seq_printf(s, "%s: ", <call>);
159  *      if (ret)
160  *              ret = trace_seq_printf(s, <TP_printk> "\n");
161  *      if (!ret)
162  *              return TRACE_TYPE_PARTIAL_LINE;
163  *
164  *      return TRACE_TYPE_HANDLED;
165  * }
166  *
167  * This is the method used to print the raw event to the trace
168  * output format. Note, this is not needed if the data is read
169  * in binary.
170  */
171
172 #undef __entry
173 #define __entry field
174
175 #undef TP_printk
176 #define TP_printk(fmt, args...) fmt "\n", args
177
178 #undef __get_dynamic_array
179 #define __get_dynamic_array(field)      \
180                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
181
182 #undef __get_str
183 #define __get_str(field) (char *)__get_dynamic_array(field)
184
185 #undef __print_flags
186 #define __print_flags(flag, delim, flag_array...)                       \
187         ({                                                              \
188                 static const struct trace_print_flags __flags[] =       \
189                         { flag_array, { -1, NULL }};                    \
190                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
191         })
192
193 #undef __print_symbolic
194 #define __print_symbolic(value, symbol_array...)                        \
195         ({                                                              \
196                 static const struct trace_print_flags symbols[] =       \
197                         { symbol_array, { -1, NULL }};                  \
198                 ftrace_print_symbols_seq(p, value, symbols);            \
199         })
200
201 #undef __print_hex
202 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
203
204 #undef DECLARE_EVENT_CLASS
205 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
206 static notrace enum print_line_t                                        \
207 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
208                          struct trace_event *trace_event)               \
209 {                                                                       \
210         struct ftrace_event_call *event;                                \
211         struct trace_seq *s = &iter->seq;                               \
212         struct ftrace_raw_##call *field;                                \
213         struct trace_entry *entry;                                      \
214         struct trace_seq *p = &iter->tmp_seq;                           \
215         int ret;                                                        \
216                                                                         \
217         event = container_of(trace_event, struct ftrace_event_call,     \
218                              event);                                    \
219                                                                         \
220         entry = iter->ent;                                              \
221                                                                         \
222         if (entry->type != event->event.type) {                         \
223                 WARN_ON_ONCE(1);                                        \
224                 return TRACE_TYPE_UNHANDLED;                            \
225         }                                                               \
226                                                                         \
227         field = (typeof(field))entry;                                   \
228                                                                         \
229         trace_seq_init(p);                                              \
230         ret = trace_seq_printf(s, "%s: ", event->name);                 \
231         if (ret)                                                        \
232                 ret = trace_seq_printf(s, print);                       \
233         if (!ret)                                                       \
234                 return TRACE_TYPE_PARTIAL_LINE;                         \
235                                                                         \
236         return TRACE_TYPE_HANDLED;                                      \
237 }                                                                       \
238 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
239         .trace                  = ftrace_raw_output_##call,             \
240 };
241
242 #undef DEFINE_EVENT_PRINT
243 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
244 static notrace enum print_line_t                                        \
245 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
246                          struct trace_event *event)                     \
247 {                                                                       \
248         struct trace_seq *s = &iter->seq;                               \
249         struct ftrace_raw_##template *field;                            \
250         struct trace_entry *entry;                                      \
251         struct trace_seq *p = &iter->tmp_seq;                           \
252         int ret;                                                        \
253                                                                         \
254         entry = iter->ent;                                              \
255                                                                         \
256         if (entry->type != event_##call.event.type) {                   \
257                 WARN_ON_ONCE(1);                                        \
258                 return TRACE_TYPE_UNHANDLED;                            \
259         }                                                               \
260                                                                         \
261         field = (typeof(field))entry;                                   \
262                                                                         \
263         trace_seq_init(p);                                              \
264         ret = trace_seq_printf(s, "%s: ", #call);                       \
265         if (ret)                                                        \
266                 ret = trace_seq_printf(s, print);                       \
267         if (!ret)                                                       \
268                 return TRACE_TYPE_PARTIAL_LINE;                         \
269                                                                         \
270         return TRACE_TYPE_HANDLED;                                      \
271 }                                                                       \
272 static struct trace_event_functions ftrace_event_type_funcs_##call = {  \
273         .trace                  = ftrace_raw_output_##call,             \
274 };
275
276 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
277
278 #undef __field_ext
279 #define __field_ext(type, item, filter_type)                            \
280         ret = trace_define_field(event_call, #type, #item,              \
281                                  offsetof(typeof(field), item),         \
282                                  sizeof(field.item),                    \
283                                  is_signed_type(type), filter_type);    \
284         if (ret)                                                        \
285                 return ret;
286
287 #undef __field
288 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
289
290 #undef __array
291 #define __array(type, item, len)                                        \
292         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
293         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
294                                  offsetof(typeof(field), item),         \
295                                  sizeof(field.item),                    \
296                                  is_signed_type(type), FILTER_OTHER);   \
297         if (ret)                                                        \
298                 return ret;
299
300 #undef __dynamic_array
301 #define __dynamic_array(type, item, len)                                       \
302         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
303                                  offsetof(typeof(field), __data_loc_##item),   \
304                                  sizeof(field.__data_loc_##item),              \
305                                  is_signed_type(type), FILTER_OTHER);
306
307 #undef __string
308 #define __string(item, src) __dynamic_array(char, item, -1)
309
310 #undef DECLARE_EVENT_CLASS
311 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
312 static int notrace                                                      \
313 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
314 {                                                                       \
315         struct ftrace_raw_##call field;                                 \
316         int ret;                                                        \
317                                                                         \
318         tstruct;                                                        \
319                                                                         \
320         return ret;                                                     \
321 }
322
323 #undef DEFINE_EVENT
324 #define DEFINE_EVENT(template, name, proto, args)
325
326 #undef DEFINE_EVENT_PRINT
327 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
328         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
329
330 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
331
332 /*
333  * remember the offset of each array from the beginning of the event.
334  */
335
336 #undef __entry
337 #define __entry entry
338
339 #undef __field
340 #define __field(type, item)
341
342 #undef __field_ext
343 #define __field_ext(type, item, filter_type)
344
345 #undef __array
346 #define __array(type, item, len)
347
348 #undef __dynamic_array
349 #define __dynamic_array(type, item, len)                                \
350         __data_offsets->item = __data_size +                            \
351                                offsetof(typeof(*entry), __data);        \
352         __data_offsets->item |= (len * sizeof(type)) << 16;             \
353         __data_size += (len) * sizeof(type);
354
355 #undef __string
356 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
357
358 #undef DECLARE_EVENT_CLASS
359 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
360 static inline notrace int ftrace_get_offsets_##call(                    \
361         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
362 {                                                                       \
363         int __data_size = 0;                                            \
364         struct ftrace_raw_##call __maybe_unused *entry;                 \
365                                                                         \
366         tstruct;                                                        \
367                                                                         \
368         return __data_size;                                             \
369 }
370
371 #undef DEFINE_EVENT
372 #define DEFINE_EVENT(template, name, proto, args)
373
374 #undef DEFINE_EVENT_PRINT
375 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
376         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
377
378 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
379
380 /*
381  * Stage 4 of the trace events.
382  *
383  * Override the macros in <trace/trace_events.h> to include the following:
384  *
385  * For those macros defined with TRACE_EVENT:
386  *
387  * static struct ftrace_event_call event_<call>;
388  *
389  * static void ftrace_raw_event_<call>(void *__data, proto)
390  * {
391  *      struct ftrace_event_call *event_call = __data;
392  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
393  *      struct ring_buffer_event *event;
394  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
395  *      struct ring_buffer *buffer;
396  *      unsigned long irq_flags;
397  *      int __data_size;
398  *      int pc;
399  *
400  *      local_save_flags(irq_flags);
401  *      pc = preempt_count();
402  *
403  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
404  *
405  *      event = trace_current_buffer_lock_reserve(&buffer,
406  *                                event_<call>->event.type,
407  *                                sizeof(*entry) + __data_size,
408  *                                irq_flags, pc);
409  *      if (!event)
410  *              return;
411  *      entry   = ring_buffer_event_data(event);
412  *
413  *      { <assign>; }  <-- Here we assign the entries by the __field and
414  *                         __array macros.
415  *
416  *      if (!filter_current_check_discard(buffer, event_call, entry, event))
417  *              trace_current_buffer_unlock_commit(buffer,
418  *                                                 event, irq_flags, pc);
419  * }
420  *
421  * static struct trace_event ftrace_event_type_<call> = {
422  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
423  * };
424  *
425  * static const char print_fmt_<call>[] = <TP_printk>;
426  *
427  * static struct ftrace_event_class __used event_class_<template> = {
428  *      .system                 = "<system>",
429  *      .define_fields          = ftrace_define_fields_<call>,
430  *      .fields                 = LIST_HEAD_INIT(event_class_##call.fields),
431  *      .raw_init               = trace_event_raw_init,
432  *      .probe                  = ftrace_raw_event_##call,
433  *      .reg                    = ftrace_event_reg,
434  * };
435  *
436  * static struct ftrace_event_call __used
437  * __attribute__((__aligned__(4)))
438  * __attribute__((section("_ftrace_events"))) event_<call> = {
439  *      .name                   = "<call>",
440  *      .class                  = event_class_<template>,
441  *      .event                  = &ftrace_event_type_<call>,
442  *      .print_fmt              = print_fmt_<call>,
443  * };
444  *
445  */
446
447 #ifdef CONFIG_PERF_EVENTS
448
449 #define _TRACE_PERF_PROTO(call, proto)                                  \
450         static notrace void                                             \
451         perf_trace_##call(void *__data, proto);
452
453 #define _TRACE_PERF_INIT(call)                                          \
454         .perf_probe             = perf_trace_##call,
455
456 #else
457 #define _TRACE_PERF_PROTO(call, proto)
458 #define _TRACE_PERF_INIT(call)
459 #endif /* CONFIG_PERF_EVENTS */
460
461 #undef __entry
462 #define __entry entry
463
464 #undef __field
465 #define __field(type, item)
466
467 #undef __array
468 #define __array(type, item, len)
469
470 #undef __dynamic_array
471 #define __dynamic_array(type, item, len)                                \
472         __entry->__data_loc_##item = __data_offsets.item;
473
474 #undef __string
475 #define __string(item, src) __dynamic_array(char, item, -1)             \
476
477 #undef __assign_str
478 #define __assign_str(dst, src)                                          \
479         strcpy(__get_str(dst), src);
480
481 #undef TP_fast_assign
482 #define TP_fast_assign(args...) args
483
484 #undef TP_perf_assign
485 #define TP_perf_assign(args...)
486
487 #undef DECLARE_EVENT_CLASS
488 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
489                                                                         \
490 static notrace void                                                     \
491 ftrace_raw_event_##call(void *__data, proto)                            \
492 {                                                                       \
493         struct ftrace_event_call *event_call = __data;                  \
494         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
495         struct ring_buffer_event *event;                                \
496         struct ftrace_raw_##call *entry;                                \
497         struct ring_buffer *buffer;                                     \
498         unsigned long irq_flags;                                        \
499         int __data_size;                                                \
500         int pc;                                                         \
501                                                                         \
502         local_save_flags(irq_flags);                                    \
503         pc = preempt_count();                                           \
504                                                                         \
505         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
506                                                                         \
507         event = trace_current_buffer_lock_reserve(&buffer,              \
508                                  event_call->event.type,                \
509                                  sizeof(*entry) + __data_size,          \
510                                  irq_flags, pc);                        \
511         if (!event)                                                     \
512                 return;                                                 \
513         entry   = ring_buffer_event_data(event);                        \
514                                                                         \
515         tstruct                                                         \
516                                                                         \
517         { assign; }                                                     \
518                                                                         \
519         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
520                 trace_nowake_buffer_unlock_commit(buffer,               \
521                                                   event, irq_flags, pc); \
522 }
523 /*
524  * The ftrace_test_probe is compiled out, it is only here as a build time check
525  * to make sure that if the tracepoint handling changes, the ftrace probe will
526  * fail to compile unless it too is updated.
527  */
528
529 #undef DEFINE_EVENT
530 #define DEFINE_EVENT(template, call, proto, args)                       \
531 static inline void ftrace_test_probe_##call(void)                       \
532 {                                                                       \
533         check_trace_callback_type_##call(ftrace_raw_event_##template);  \
534 }
535
536 #undef DEFINE_EVENT_PRINT
537 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
538
539 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
540
541 #undef __entry
542 #define __entry REC
543
544 #undef __print_flags
545 #undef __print_symbolic
546 #undef __get_dynamic_array
547 #undef __get_str
548
549 #undef TP_printk
550 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
551
552 #undef DECLARE_EVENT_CLASS
553 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
554 _TRACE_PERF_PROTO(call, PARAMS(proto));                                 \
555 static const char print_fmt_##call[] = print;                           \
556 static struct ftrace_event_class __used event_class_##call = {          \
557         .system                 = __stringify(TRACE_SYSTEM),            \
558         .define_fields          = ftrace_define_fields_##call,          \
559         .fields                 = LIST_HEAD_INIT(event_class_##call.fields),\
560         .raw_init               = trace_event_raw_init,                 \
561         .probe                  = ftrace_raw_event_##call,              \
562         .reg                    = ftrace_event_reg,                     \
563         _TRACE_PERF_INIT(call)                                          \
564 };
565
566 #undef DEFINE_EVENT
567 #define DEFINE_EVENT(template, call, proto, args)                       \
568                                                                         \
569 static struct ftrace_event_call __used                                  \
570 __attribute__((__aligned__(4)))                                         \
571 __attribute__((section("_ftrace_events"))) event_##call = {             \
572         .name                   = #call,                                \
573         .class                  = &event_class_##template,              \
574         .event.funcs            = &ftrace_event_type_funcs_##template,  \
575         .print_fmt              = print_fmt_##template,                 \
576 };
577
578 #undef DEFINE_EVENT_PRINT
579 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
580                                                                         \
581 static const char print_fmt_##call[] = print;                           \
582                                                                         \
583 static struct ftrace_event_call __used                                  \
584 __attribute__((__aligned__(4)))                                         \
585 __attribute__((section("_ftrace_events"))) event_##call = {             \
586         .name                   = #call,                                \
587         .class                  = &event_class_##template,              \
588         .event.funcs            = &ftrace_event_type_funcs_##call,      \
589         .print_fmt              = print_fmt_##call,                     \
590 }
591
592 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
593
594 /*
595  * Define the insertion callback to perf events
596  *
597  * The job is very similar to ftrace_raw_event_<call> except that we don't
598  * insert in the ring buffer but in a perf counter.
599  *
600  * static void ftrace_perf_<call>(proto)
601  * {
602  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
603  *      struct ftrace_event_call *event_call = &event_<call>;
604  *      extern void perf_tp_event(int, u64, u64, void *, int);
605  *      struct ftrace_raw_##call *entry;
606  *      struct perf_trace_buf *trace_buf;
607  *      u64 __addr = 0, __count = 1;
608  *      unsigned long irq_flags;
609  *      struct trace_entry *ent;
610  *      int __entry_size;
611  *      int __data_size;
612  *      int __cpu
613  *      int pc;
614  *
615  *      pc = preempt_count();
616  *
617  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
618  *
619  *      // Below we want to get the aligned size by taking into account
620  *      // the u32 field that will later store the buffer size
621  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
622  *                           sizeof(u64));
623  *      __entry_size -= sizeof(u32);
624  *
625  *      // Protect the non nmi buffer
626  *      // This also protects the rcu read side
627  *      local_irq_save(irq_flags);
628  *      __cpu = smp_processor_id();
629  *
630  *      if (in_nmi())
631  *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
632  *      else
633  *              trace_buf = rcu_dereference_sched(perf_trace_buf);
634  *
635  *      if (!trace_buf)
636  *              goto end;
637  *
638  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
639  *
640  *      // Avoid recursion from perf that could mess up the buffer
641  *      if (trace_buf->recursion++)
642  *              goto end_recursion;
643  *
644  *      raw_data = trace_buf->buf;
645  *
646  *      // Make recursion update visible before entering perf_tp_event
647  *      // so that we protect from perf recursions.
648  *
649  *      barrier();
650  *
651  *      //zero dead bytes from alignment to avoid stack leak to userspace:
652  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
653  *      entry = (struct ftrace_raw_<call> *)raw_data;
654  *      ent = &entry->ent;
655  *      tracing_generic_entry_update(ent, irq_flags, pc);
656  *      ent->type = event_call->id;
657  *
658  *      <tstruct> <- do some jobs with dynamic arrays
659  *
660  *      <assign>  <- affect our values
661  *
662  *      perf_tp_event(event_call->id, __addr, __count, entry,
663  *                   __entry_size);  <- submit them to perf counter
664  *
665  * }
666  */
667
668 #ifdef CONFIG_PERF_EVENTS
669
670 #undef __entry
671 #define __entry entry
672
673 #undef __get_dynamic_array
674 #define __get_dynamic_array(field)      \
675                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
676
677 #undef __get_str
678 #define __get_str(field) (char *)__get_dynamic_array(field)
679
680 #undef __perf_addr
681 #define __perf_addr(a) __addr = (a)
682
683 #undef __perf_count
684 #define __perf_count(c) __count = (c)
685
686 #undef DECLARE_EVENT_CLASS
687 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
688 static notrace void                                                     \
689 perf_trace_##call(void *__data, proto)                                  \
690 {                                                                       \
691         struct ftrace_event_call *event_call = __data;                  \
692         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
693         struct ftrace_raw_##call *entry;                                \
694         struct pt_regs __regs;                                          \
695         u64 __addr = 0, __count = 1;                                    \
696         struct hlist_head *head;                                        \
697         int __entry_size;                                               \
698         int __data_size;                                                \
699         int rctx;                                                       \
700                                                                         \
701         perf_fetch_caller_regs(&__regs);                                \
702                                                                         \
703         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
704         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
705                              sizeof(u64));                              \
706         __entry_size -= sizeof(u32);                                    \
707                                                                         \
708         if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE,               \
709                       "profile buffer not large enough"))               \
710                 return;                                                 \
711                                                                         \
712         entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare(     \
713                 __entry_size, event_call->event.type, &__regs, &rctx);  \
714         if (!entry)                                                     \
715                 return;                                                 \
716                                                                         \
717         tstruct                                                         \
718                                                                         \
719         { assign; }                                                     \
720                                                                         \
721         head = this_cpu_ptr(event_call->perf_events);                   \
722         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
723                 __count, &__regs, head);                                \
724 }
725
726 /*
727  * This part is compiled out, it is only here as a build time check
728  * to make sure that if the tracepoint handling changes, the
729  * perf probe will fail to compile unless it too is updated.
730  */
731 #undef DEFINE_EVENT
732 #define DEFINE_EVENT(template, call, proto, args)                       \
733 static inline void perf_test_probe_##call(void)                         \
734 {                                                                       \
735         check_trace_callback_type_##call(perf_trace_##template);        \
736 }
737
738
739 #undef DEFINE_EVENT_PRINT
740 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
741         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
742
743 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
744 #endif /* CONFIG_PERF_EVENTS */
745
746 #undef _TRACE_PROFILE_INIT
747