4945d1c998645548a818a939bf1ad30b0a497734
[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 #undef __field
22 #define __field(type, item)             type    item;
23
24 #undef __field_ext
25 #define __field_ext(type, item, filter_type)    type    item;
26
27 #undef __array
28 #define __array(type, item, len)        type    item[len];
29
30 #undef __dynamic_array
31 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
32
33 #undef __string
34 #define __string(item, src) __dynamic_array(char, item, -1)
35
36 #undef TP_STRUCT__entry
37 #define TP_STRUCT__entry(args...) args
38
39 #undef TRACE_EVENT
40 #define TRACE_EVENT(name, proto, args, tstruct, assign, print)  \
41         struct ftrace_raw_##name {                              \
42                 struct trace_entry      ent;                    \
43                 tstruct                                         \
44                 char                    __data[0];              \
45         };                                                      \
46         static struct ftrace_event_call event_##name
47
48 #undef __cpparg
49 #define __cpparg(arg...) arg
50
51 /* Callbacks are meaningless to ftrace. */
52 #undef TRACE_EVENT_FN
53 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
54                 assign, print, reg, unreg)                              \
55         TRACE_EVENT(name, __cpparg(proto), __cpparg(args),              \
56                 __cpparg(tstruct), __cpparg(assign), __cpparg(print))   \
57
58 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
59
60
61 /*
62  * Stage 2 of the trace events.
63  *
64  * Include the following:
65  *
66  * struct ftrace_data_offsets_<call> {
67  *      u32                             <item1>;
68  *      u32                             <item2>;
69  *      [...]
70  * };
71  *
72  * The __dynamic_array() macro will create each u32 <item>, this is
73  * to keep the offset of each array from the beginning of the event.
74  * The size of an array is also encoded, in the higher 16 bits of <item>.
75  */
76
77 #undef __field
78 #define __field(type, item)
79
80 #undef __field_ext
81 #define __field_ext(type, item, filter_type)
82
83 #undef __array
84 #define __array(type, item, len)
85
86 #undef __dynamic_array
87 #define __dynamic_array(type, item, len)        u32 item;
88
89 #undef __string
90 #define __string(item, src) __dynamic_array(char, item, -1)
91
92 #undef TRACE_EVENT
93 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
94         struct ftrace_data_offsets_##call {                             \
95                 tstruct;                                                \
96         };
97
98 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
99
100 /*
101  * Setup the showing format of trace point.
102  *
103  * int
104  * ftrace_format_##call(struct trace_seq *s)
105  * {
106  *      struct ftrace_raw_##call field;
107  *      int ret;
108  *
109  *      ret = trace_seq_printf(s, #type " " #item ";"
110  *                             " offset:%u; size:%u;\n",
111  *                             offsetof(struct ftrace_raw_##call, item),
112  *                             sizeof(field.type));
113  *
114  * }
115  */
116
117 #undef TP_STRUCT__entry
118 #define TP_STRUCT__entry(args...) args
119
120 #undef __field
121 #define __field(type, item)                                     \
122         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
123                                "offset:%u;\tsize:%u;\tsigned:%u;\n",    \
124                                (unsigned int)offsetof(typeof(field), item), \
125                                (unsigned int)sizeof(field.item),        \
126                                (unsigned int)is_signed_type(type));     \
127         if (!ret)                                                       \
128                 return 0;
129
130 #undef __field_ext
131 #define __field_ext(type, item, filter_type)    __field(type, item)
132
133 #undef __array
134 #define __array(type, item, len)                                                \
135         ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
136                                "offset:%u;\tsize:%u;\tsigned:%u;\n",    \
137                                (unsigned int)offsetof(typeof(field), item), \
138                                (unsigned int)sizeof(field.item),        \
139                                (unsigned int)is_signed_type(type));     \
140         if (!ret)                                                       \
141                 return 0;
142
143 #undef __dynamic_array
144 #define __dynamic_array(type, item, len)                                       \
145         ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
146                                "offset:%u;\tsize:%u;\tsigned:%u;\n",           \
147                                (unsigned int)offsetof(typeof(field),           \
148                                         __data_loc_##item),                    \
149                                (unsigned int)sizeof(field.__data_loc_##item), \
150                                (unsigned int)is_signed_type(type));     \
151         if (!ret)                                                              \
152                 return 0;
153
154 #undef __string
155 #define __string(item, src) __dynamic_array(char, item, -1)
156
157 #undef __entry
158 #define __entry REC
159
160 #undef __print_symbolic
161 #undef __get_dynamic_array
162 #undef __get_str
163
164 #undef TP_printk
165 #define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
166
167 #undef TP_fast_assign
168 #define TP_fast_assign(args...) args
169
170 #undef TP_perf_assign
171 #define TP_perf_assign(args...)
172
173 #undef TRACE_EVENT
174 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
175 static int                                                              \
176 ftrace_format_##call(struct ftrace_event_call *unused,                  \
177                       struct trace_seq *s)                              \
178 {                                                                       \
179         struct ftrace_raw_##call field __attribute__((unused));         \
180         int ret = 0;                                                    \
181                                                                         \
182         tstruct;                                                        \
183                                                                         \
184         trace_seq_printf(s, "\nprint fmt: " print);                     \
185                                                                         \
186         return ret;                                                     \
187 }
188
189 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
190
191 /*
192  * Stage 3 of the trace events.
193  *
194  * Override the macros in <trace/trace_events.h> to include the following:
195  *
196  * enum print_line_t
197  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
198  * {
199  *      struct trace_seq *s = &iter->seq;
200  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
201  *      struct trace_entry *entry;
202  *      struct trace_seq *p;
203  *      int ret;
204  *
205  *      entry = iter->ent;
206  *
207  *      if (entry->type != event_<call>.id) {
208  *              WARN_ON_ONCE(1);
209  *              return TRACE_TYPE_UNHANDLED;
210  *      }
211  *
212  *      field = (typeof(field))entry;
213  *
214  *      p = get_cpu_var(ftrace_event_seq);
215  *      trace_seq_init(p);
216  *      ret = trace_seq_printf(s, <TP_printk> "\n");
217  *      put_cpu();
218  *      if (!ret)
219  *              return TRACE_TYPE_PARTIAL_LINE;
220  *
221  *      return TRACE_TYPE_HANDLED;
222  * }
223  *
224  * This is the method used to print the raw event to the trace
225  * output format. Note, this is not needed if the data is read
226  * in binary.
227  */
228
229 #undef __entry
230 #define __entry field
231
232 #undef TP_printk
233 #define TP_printk(fmt, args...) fmt "\n", args
234
235 #undef __get_dynamic_array
236 #define __get_dynamic_array(field)      \
237                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
238
239 #undef __get_str
240 #define __get_str(field) (char *)__get_dynamic_array(field)
241
242 #undef __print_flags
243 #define __print_flags(flag, delim, flag_array...)                       \
244         ({                                                              \
245                 static const struct trace_print_flags __flags[] =       \
246                         { flag_array, { -1, NULL }};                    \
247                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
248         })
249
250 #undef __print_symbolic
251 #define __print_symbolic(value, symbol_array...)                        \
252         ({                                                              \
253                 static const struct trace_print_flags symbols[] =       \
254                         { symbol_array, { -1, NULL }};                  \
255                 ftrace_print_symbols_seq(p, value, symbols);            \
256         })
257
258 #undef TRACE_EVENT
259 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
260 static enum print_line_t                                                \
261 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
262 {                                                                       \
263         struct trace_seq *s = &iter->seq;                               \
264         struct ftrace_raw_##call *field;                                \
265         struct trace_entry *entry;                                      \
266         struct trace_seq *p;                                            \
267         int ret;                                                        \
268                                                                         \
269         entry = iter->ent;                                              \
270                                                                         \
271         if (entry->type != event_##call.id) {                           \
272                 WARN_ON_ONCE(1);                                        \
273                 return TRACE_TYPE_UNHANDLED;                            \
274         }                                                               \
275                                                                         \
276         field = (typeof(field))entry;                                   \
277                                                                         \
278         p = &get_cpu_var(ftrace_event_seq);                             \
279         trace_seq_init(p);                                              \
280         ret = trace_seq_printf(s, #call ": " print);                    \
281         put_cpu();                                                      \
282         if (!ret)                                                       \
283                 return TRACE_TYPE_PARTIAL_LINE;                         \
284                                                                         \
285         return TRACE_TYPE_HANDLED;                                      \
286 }
287         
288 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
289
290 #undef __field_ext
291 #define __field_ext(type, item, filter_type)                            \
292         ret = trace_define_field(event_call, #type, #item,              \
293                                  offsetof(typeof(field), item),         \
294                                  sizeof(field.item),                    \
295                                  is_signed_type(type), filter_type);    \
296         if (ret)                                                        \
297                 return ret;
298
299 #undef __field
300 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
301
302 #undef __array
303 #define __array(type, item, len)                                        \
304         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
305         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
306                                  offsetof(typeof(field), item),         \
307                                  sizeof(field.item), 0, FILTER_OTHER);  \
308         if (ret)                                                        \
309                 return ret;
310
311 #undef __dynamic_array
312 #define __dynamic_array(type, item, len)                                       \
313         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
314                                  offsetof(typeof(field), __data_loc_##item),   \
315                                  sizeof(field.__data_loc_##item), 0,           \
316                                  FILTER_OTHER);
317
318 #undef __string
319 #define __string(item, src) __dynamic_array(char, item, -1)
320
321 #undef TRACE_EVENT
322 #define TRACE_EVENT(call, proto, args, tstruct, func, print)            \
323 static int                                                              \
324 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
325 {                                                                       \
326         struct ftrace_raw_##call field;                                 \
327         int ret;                                                        \
328                                                                         \
329         ret = trace_define_common_fields(event_call);                   \
330         if (ret)                                                        \
331                 return ret;                                             \
332                                                                         \
333         tstruct;                                                        \
334                                                                         \
335         return ret;                                                     \
336 }
337
338 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
339
340 /*
341  * remember the offset of each array from the beginning of the event.
342  */
343
344 #undef __entry
345 #define __entry entry
346
347 #undef __field
348 #define __field(type, item)
349
350 #undef __field_ext
351 #define __field_ext(type, item, filter_type)
352
353 #undef __array
354 #define __array(type, item, len)
355
356 #undef __dynamic_array
357 #define __dynamic_array(type, item, len)                                \
358         __data_offsets->item = __data_size +                            \
359                                offsetof(typeof(*entry), __data);        \
360         __data_offsets->item |= (len * sizeof(type)) << 16;             \
361         __data_size += (len) * sizeof(type);
362
363 #undef __string
364 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)       \
365
366 #undef TRACE_EVENT
367 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
368 static inline int ftrace_get_offsets_##call(                            \
369         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
370 {                                                                       \
371         int __data_size = 0;                                            \
372         struct ftrace_raw_##call __maybe_unused *entry;                 \
373                                                                         \
374         tstruct;                                                        \
375                                                                         \
376         return __data_size;                                             \
377 }
378
379 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
380
381 #ifdef CONFIG_EVENT_PROFILE
382
383 /*
384  * Generate the functions needed for tracepoint perf_event support.
385  *
386  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
387  *
388  * static int ftrace_profile_enable_<call>(void)
389  * {
390  *      return register_trace_<call>(ftrace_profile_<call>);
391  * }
392  *
393  * static void ftrace_profile_disable_<call>(void)
394  * {
395  *      unregister_trace_<call>(ftrace_profile_<call>);
396  * }
397  *
398  */
399
400 #undef TRACE_EVENT
401 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
402                                                                         \
403 static void ftrace_profile_##call(proto);                               \
404                                                                         \
405 static int ftrace_profile_enable_##call(struct ftrace_event_call *unused)\
406 {                                                                       \
407         return register_trace_##call(ftrace_profile_##call);            \
408 }                                                                       \
409                                                                         \
410 static void ftrace_profile_disable_##call(struct ftrace_event_call *unused)\
411 {                                                                       \
412         unregister_trace_##call(ftrace_profile_##call);                 \
413 }
414
415 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
416
417 #endif
418
419 /*
420  * Stage 4 of the trace events.
421  *
422  * Override the macros in <trace/trace_events.h> to include the following:
423  *
424  * static void ftrace_event_<call>(proto)
425  * {
426  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
427  * }
428  *
429  * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
430  * {
431  *      int ret;
432  *
433  *      ret = register_trace_<call>(ftrace_event_<call>);
434  *      if (!ret)
435  *              pr_info("event trace: Could not activate trace point "
436  *                      "probe to  <call>");
437  *      return ret;
438  * }
439  *
440  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
441  * {
442  *      unregister_trace_<call>(ftrace_event_<call>);
443  * }
444  *
445  *
446  * For those macros defined with TRACE_EVENT:
447  *
448  * static struct ftrace_event_call event_<call>;
449  *
450  * static void ftrace_raw_event_<call>(proto)
451  * {
452  *      struct ring_buffer_event *event;
453  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
454  *      struct ring_buffer *buffer;
455  *      unsigned long irq_flags;
456  *      int pc;
457  *
458  *      local_save_flags(irq_flags);
459  *      pc = preempt_count();
460  *
461  *      event = trace_current_buffer_lock_reserve(&buffer,
462  *                                event_<call>.id,
463  *                                sizeof(struct ftrace_raw_<call>),
464  *                                irq_flags, pc);
465  *      if (!event)
466  *              return;
467  *      entry   = ring_buffer_event_data(event);
468  *
469  *      <assign>;  <-- Here we assign the entries by the __field and
470  *                      __array macros.
471  *
472  *      trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
473  * }
474  *
475  * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
476  * {
477  *      int ret;
478  *
479  *      ret = register_trace_<call>(ftrace_raw_event_<call>);
480  *      if (!ret)
481  *              pr_info("event trace: Could not activate trace point "
482  *                      "probe to <call>");
483  *      return ret;
484  * }
485  *
486  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
487  * {
488  *      unregister_trace_<call>(ftrace_raw_event_<call>);
489  * }
490  *
491  * static struct trace_event ftrace_event_type_<call> = {
492  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
493  * };
494  *
495  * static int ftrace_raw_init_event_<call>(struct ftrace_event_call *unused)
496  * {
497  *      int id;
498  *
499  *      id = register_ftrace_event(&ftrace_event_type_<call>);
500  *      if (!id)
501  *              return -ENODEV;
502  *      event_<call>.id = id;
503  *      return 0;
504  * }
505  *
506  * static struct ftrace_event_call __used
507  * __attribute__((__aligned__(4)))
508  * __attribute__((section("_ftrace_events"))) event_<call> = {
509  *      .name                   = "<call>",
510  *      .system                 = "<system>",
511  *      .raw_init               = ftrace_raw_init_event_<call>,
512  *      .regfunc                = ftrace_reg_event_<call>,
513  *      .unregfunc              = ftrace_unreg_event_<call>,
514  *      .show_format            = ftrace_format_<call>,
515  * }
516  *
517  */
518
519 #undef TP_FMT
520 #define TP_FMT(fmt, args...)    fmt "\n", ##args
521
522 #ifdef CONFIG_EVENT_PROFILE
523
524 #define _TRACE_PROFILE_INIT(call)                                       \
525         .profile_count = ATOMIC_INIT(-1),                               \
526         .profile_enable = ftrace_profile_enable_##call,                 \
527         .profile_disable = ftrace_profile_disable_##call,
528
529 #else
530 #define _TRACE_PROFILE_INIT(call)
531 #endif
532
533 #undef __entry
534 #define __entry entry
535
536 #undef __field
537 #define __field(type, item)
538
539 #undef __array
540 #define __array(type, item, len)
541
542 #undef __dynamic_array
543 #define __dynamic_array(type, item, len)                                \
544         __entry->__data_loc_##item = __data_offsets.item;
545
546 #undef __string
547 #define __string(item, src) __dynamic_array(char, item, -1)             \
548
549 #undef __assign_str
550 #define __assign_str(dst, src)                                          \
551         strcpy(__get_str(dst), src);
552
553 #undef TRACE_EVENT
554 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
555                                                                         \
556 static struct ftrace_event_call event_##call;                           \
557                                                                         \
558 static void ftrace_raw_event_##call(proto)                              \
559 {                                                                       \
560         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
561         struct ftrace_event_call *event_call = &event_##call;           \
562         struct ring_buffer_event *event;                                \
563         struct ftrace_raw_##call *entry;                                \
564         struct ring_buffer *buffer;                                     \
565         unsigned long irq_flags;                                        \
566         int __data_size;                                                \
567         int pc;                                                         \
568                                                                         \
569         local_save_flags(irq_flags);                                    \
570         pc = preempt_count();                                           \
571                                                                         \
572         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
573                                                                         \
574         event = trace_current_buffer_lock_reserve(&buffer,              \
575                                  event_##call.id,                       \
576                                  sizeof(*entry) + __data_size,          \
577                                  irq_flags, pc);                        \
578         if (!event)                                                     \
579                 return;                                                 \
580         entry   = ring_buffer_event_data(event);                        \
581                                                                         \
582                                                                         \
583         tstruct                                                         \
584                                                                         \
585         { assign; }                                                     \
586                                                                         \
587         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
588                 trace_nowake_buffer_unlock_commit(buffer,               \
589                                                   event, irq_flags, pc); \
590 }                                                                       \
591                                                                         \
592 static int ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)\
593 {                                                                       \
594         int ret;                                                        \
595                                                                         \
596         ret = register_trace_##call(ftrace_raw_event_##call);           \
597         if (ret)                                                        \
598                 pr_info("event trace: Could not activate trace point "  \
599                         "probe to " #call "\n");                        \
600         return ret;                                                     \
601 }                                                                       \
602                                                                         \
603 static void ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)\
604 {                                                                       \
605         unregister_trace_##call(ftrace_raw_event_##call);               \
606 }                                                                       \
607                                                                         \
608 static struct trace_event ftrace_event_type_##call = {                  \
609         .trace                  = ftrace_raw_output_##call,             \
610 };                                                                      \
611                                                                         \
612 static int ftrace_raw_init_event_##call(struct ftrace_event_call *unused)\
613 {                                                                       \
614         int id;                                                         \
615                                                                         \
616         id = register_ftrace_event(&ftrace_event_type_##call);          \
617         if (!id)                                                        \
618                 return -ENODEV;                                         \
619         event_##call.id = id;                                           \
620         INIT_LIST_HEAD(&event_##call.fields);                           \
621         return 0;                                                       \
622 }                                                                       \
623                                                                         \
624 static struct ftrace_event_call __used                                  \
625 __attribute__((__aligned__(4)))                                         \
626 __attribute__((section("_ftrace_events"))) event_##call = {             \
627         .name                   = #call,                                \
628         .system                 = __stringify(TRACE_SYSTEM),            \
629         .event                  = &ftrace_event_type_##call,            \
630         .raw_init               = ftrace_raw_init_event_##call,         \
631         .regfunc                = ftrace_raw_reg_event_##call,          \
632         .unregfunc              = ftrace_raw_unreg_event_##call,        \
633         .show_format            = ftrace_format_##call,                 \
634         .define_fields          = ftrace_define_fields_##call,          \
635         _TRACE_PROFILE_INIT(call)                                       \
636 }
637
638 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
639
640 /*
641  * Define the insertion callback to profile events
642  *
643  * The job is very similar to ftrace_raw_event_<call> except that we don't
644  * insert in the ring buffer but in a perf counter.
645  *
646  * static void ftrace_profile_<call>(proto)
647  * {
648  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
649  *      struct ftrace_event_call *event_call = &event_<call>;
650  *      extern void perf_tp_event(int, u64, u64, void *, int);
651  *      struct ftrace_raw_##call *entry;
652  *      struct perf_trace_buf *trace_buf;
653  *      u64 __addr = 0, __count = 1;
654  *      unsigned long irq_flags;
655  *      struct trace_entry *ent;
656  *      int __entry_size;
657  *      int __data_size;
658  *      int __cpu
659  *      int pc;
660  *
661  *      pc = preempt_count();
662  *
663  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
664  *
665  *      // Below we want to get the aligned size by taking into account
666  *      // the u32 field that will later store the buffer size
667  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
668  *                           sizeof(u64));
669  *      __entry_size -= sizeof(u32);
670  *
671  *      // Protect the non nmi buffer
672  *      // This also protects the rcu read side
673  *      local_irq_save(irq_flags);
674  *      __cpu = smp_processor_id();
675  *
676  *      if (in_nmi())
677  *              trace_buf = rcu_dereference(perf_trace_buf_nmi);
678  *      else
679  *              trace_buf = rcu_dereference(perf_trace_buf);
680  *
681  *      if (!trace_buf)
682  *              goto end;
683  *
684  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
685  *
686  *      // Avoid recursion from perf that could mess up the buffer
687  *      if (trace_buf->recursion++)
688  *              goto end_recursion;
689  *
690  *      raw_data = trace_buf->buf;
691  *
692  *      // Make recursion update visible before entering perf_tp_event
693  *      // so that we protect from perf recursions.
694  *
695  *      barrier();
696  *
697  *      //zero dead bytes from alignment to avoid stack leak to userspace:
698  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
699  *      entry = (struct ftrace_raw_<call> *)raw_data;
700  *      ent = &entry->ent;
701  *      tracing_generic_entry_update(ent, irq_flags, pc);
702  *      ent->type = event_call->id;
703  *
704  *      <tstruct> <- do some jobs with dynamic arrays
705  *
706  *      <assign>  <- affect our values
707  *
708  *      perf_tp_event(event_call->id, __addr, __count, entry,
709  *                   __entry_size);  <- submit them to perf counter
710  *
711  * }
712  */
713
714 #ifdef CONFIG_EVENT_PROFILE
715
716 #undef __perf_addr
717 #define __perf_addr(a) __addr = (a)
718
719 #undef __perf_count
720 #define __perf_count(c) __count = (c)
721
722 #undef TRACE_EVENT
723 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)          \
724 static void ftrace_profile_##call(proto)                                \
725 {                                                                       \
726         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
727         struct ftrace_event_call *event_call = &event_##call;           \
728         extern void perf_tp_event(int, u64, u64, void *, int);          \
729         struct ftrace_raw_##call *entry;                                \
730         struct perf_trace_buf *trace_buf;                               \
731         u64 __addr = 0, __count = 1;                                    \
732         unsigned long irq_flags;                                        \
733         struct trace_entry *ent;                                        \
734         int __entry_size;                                               \
735         int __data_size;                                                \
736         char *raw_data;                                                 \
737         int __cpu;                                                      \
738         int pc;                                                         \
739                                                                         \
740         pc = preempt_count();                                           \
741                                                                         \
742         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
743         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
744                              sizeof(u64));                              \
745         __entry_size -= sizeof(u32);                                    \
746                                                                         \
747         if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE,           \
748                       "profile buffer not large enough"))               \
749                 return;                                                 \
750                                                                         \
751         local_irq_save(irq_flags);                                      \
752         __cpu = smp_processor_id();                                     \
753                                                                         \
754         if (in_nmi())                                                   \
755                 trace_buf = rcu_dereference(perf_trace_buf_nmi);        \
756         else                                                            \
757                 trace_buf = rcu_dereference(perf_trace_buf);            \
758                                                                         \
759         if (!trace_buf)                                                 \
760                 goto end;                                               \
761                                                                         \
762         trace_buf = per_cpu_ptr(trace_buf, __cpu);                      \
763         if (trace_buf->recursion++)                                     \
764                 goto end_recursion;                                     \
765                                                                         \
766         barrier();                                                      \
767                                                                         \
768         raw_data = trace_buf->buf;                                      \
769                                                                         \
770         *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;         \
771         entry = (struct ftrace_raw_##call *)raw_data;                   \
772         ent = &entry->ent;                                              \
773         tracing_generic_entry_update(ent, irq_flags, pc);               \
774         ent->type = event_call->id;                                     \
775                                                                         \
776         tstruct                                                         \
777                                                                         \
778         { assign; }                                                     \
779                                                                         \
780         perf_tp_event(event_call->id, __addr, __count, entry,           \
781                              __entry_size);                             \
782                                                                         \
783 end_recursion:                                                          \
784         trace_buf->recursion--;                                         \
785 end:                                                                    \
786         local_irq_restore(irq_flags);                                   \
787                                                                         \
788 }
789
790 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
791 #endif /* CONFIG_EVENT_PROFILE */
792
793 #undef _TRACE_PROFILE_INIT
794