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