Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-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 #undef DEFINE_EVENT
67 #define DEFINE_EVENT(template, name, proto, args)       \
68         static struct ftrace_event_call event_##name
69
70 #undef DEFINE_EVENT_PRINT
71 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
72         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
73
74 #undef __cpparg
75 #define __cpparg(arg...) arg
76
77 /* Callbacks are meaningless to ftrace. */
78 #undef TRACE_EVENT_FN
79 #define TRACE_EVENT_FN(name, proto, args, tstruct,                      \
80                 assign, print, reg, unreg)                              \
81         TRACE_EVENT(name, __cpparg(proto), __cpparg(args),              \
82                 __cpparg(tstruct), __cpparg(assign), __cpparg(print))   \
83
84 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
85
86
87 /*
88  * Stage 2 of the trace events.
89  *
90  * Include the following:
91  *
92  * struct ftrace_data_offsets_<call> {
93  *      u32                             <item1>;
94  *      u32                             <item2>;
95  *      [...]
96  * };
97  *
98  * The __dynamic_array() macro will create each u32 <item>, this is
99  * to keep the offset of each array from the beginning of the event.
100  * The size of an array is also encoded, in the higher 16 bits of <item>.
101  */
102
103 #undef __field
104 #define __field(type, item)
105
106 #undef __field_ext
107 #define __field_ext(type, item, filter_type)
108
109 #undef __array
110 #define __array(type, item, len)
111
112 #undef __dynamic_array
113 #define __dynamic_array(type, item, len)        u32 item;
114
115 #undef __string
116 #define __string(item, src) __dynamic_array(char, item, -1)
117
118 #undef DECLARE_EVENT_CLASS
119 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
120         struct ftrace_data_offsets_##call {                             \
121                 tstruct;                                                \
122         };
123
124 #undef DEFINE_EVENT
125 #define DEFINE_EVENT(template, name, proto, args)
126
127 #undef DEFINE_EVENT_PRINT
128 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
129         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
130
131 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
132
133 /*
134  * Setup the showing format of trace point.
135  *
136  * int
137  * ftrace_format_##call(struct trace_seq *s)
138  * {
139  *      struct ftrace_raw_##call field;
140  *      int ret;
141  *
142  *      ret = trace_seq_printf(s, #type " " #item ";"
143  *                             " offset:%u; size:%u;\n",
144  *                             offsetof(struct ftrace_raw_##call, item),
145  *                             sizeof(field.type));
146  *
147  * }
148  */
149
150 #undef TP_STRUCT__entry
151 #define TP_STRUCT__entry(args...) args
152
153 #undef __field
154 #define __field(type, item)                                     \
155         ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"      \
156                                "offset:%u;\tsize:%u;\tsigned:%u;\n",    \
157                                (unsigned int)offsetof(typeof(field), item), \
158                                (unsigned int)sizeof(field.item),        \
159                                (unsigned int)is_signed_type(type));     \
160         if (!ret)                                                       \
161                 return 0;
162
163 #undef __field_ext
164 #define __field_ext(type, item, filter_type)    __field(type, item)
165
166 #undef __array
167 #define __array(type, item, len)                                                \
168         ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
169                                "offset:%u;\tsize:%u;\tsigned:%u;\n",    \
170                                (unsigned int)offsetof(typeof(field), item), \
171                                (unsigned int)sizeof(field.item),        \
172                                (unsigned int)is_signed_type(type));     \
173         if (!ret)                                                       \
174                 return 0;
175
176 #undef __dynamic_array
177 #define __dynamic_array(type, item, len)                                       \
178         ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
179                                "offset:%u;\tsize:%u;\tsigned:%u;\n",           \
180                                (unsigned int)offsetof(typeof(field),           \
181                                         __data_loc_##item),                    \
182                                (unsigned int)sizeof(field.__data_loc_##item), \
183                                (unsigned int)is_signed_type(type));     \
184         if (!ret)                                                              \
185                 return 0;
186
187 #undef __string
188 #define __string(item, src) __dynamic_array(char, item, -1)
189
190 #undef __entry
191 #define __entry REC
192
193 #undef __print_symbolic
194 #undef __get_dynamic_array
195 #undef __get_str
196
197 #undef TP_printk
198 #define TP_printk(fmt, args...) "\"%s\", %s\n", fmt, __stringify(args)
199
200 #undef TP_fast_assign
201 #define TP_fast_assign(args...) args
202
203 #undef TP_perf_assign
204 #define TP_perf_assign(args...)
205
206 #undef DECLARE_EVENT_CLASS
207 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
208 static int                                                              \
209 ftrace_format_setup_##call(struct ftrace_event_call *unused,            \
210                            struct trace_seq *s)                         \
211 {                                                                       \
212         struct ftrace_raw_##call field __attribute__((unused));         \
213         int ret = 0;                                                    \
214                                                                         \
215         tstruct;                                                        \
216                                                                         \
217         return ret;                                                     \
218 }                                                                       \
219                                                                         \
220 static int                                                              \
221 ftrace_format_##call(struct ftrace_event_call *unused,                  \
222                      struct trace_seq *s)                               \
223 {                                                                       \
224         int ret = 0;                                                    \
225                                                                         \
226         ret = ftrace_format_setup_##call(unused, s);                    \
227         if (!ret)                                                       \
228                 return ret;                                             \
229                                                                         \
230         ret = trace_seq_printf(s, "\nprint fmt: " print);               \
231                                                                         \
232         return ret;                                                     \
233 }
234
235 #undef DEFINE_EVENT
236 #define DEFINE_EVENT(template, name, proto, args)
237
238 #undef DEFINE_EVENT_PRINT
239 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)          \
240 static int                                                              \
241 ftrace_format_##name(struct ftrace_event_call *unused,                  \
242                       struct trace_seq *s)                              \
243 {                                                                       \
244         int ret = 0;                                                    \
245                                                                         \
246         ret = ftrace_format_setup_##template(unused, s);                \
247         if (!ret)                                                       \
248                 return ret;                                             \
249                                                                         \
250         trace_seq_printf(s, "\nprint fmt: " print);                     \
251                                                                         \
252         return ret;                                                     \
253 }
254
255 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
256
257 /*
258  * Stage 3 of the trace events.
259  *
260  * Override the macros in <trace/trace_events.h> to include the following:
261  *
262  * enum print_line_t
263  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
264  * {
265  *      struct trace_seq *s = &iter->seq;
266  *      struct ftrace_raw_<call> *field; <-- defined in stage 1
267  *      struct trace_entry *entry;
268  *      struct trace_seq *p;
269  *      int ret;
270  *
271  *      entry = iter->ent;
272  *
273  *      if (entry->type != event_<call>.id) {
274  *              WARN_ON_ONCE(1);
275  *              return TRACE_TYPE_UNHANDLED;
276  *      }
277  *
278  *      field = (typeof(field))entry;
279  *
280  *      p = get_cpu_var(ftrace_event_seq);
281  *      trace_seq_init(p);
282  *      ret = trace_seq_printf(s, <TP_printk> "\n");
283  *      put_cpu();
284  *      if (!ret)
285  *              return TRACE_TYPE_PARTIAL_LINE;
286  *
287  *      return TRACE_TYPE_HANDLED;
288  * }
289  *
290  * This is the method used to print the raw event to the trace
291  * output format. Note, this is not needed if the data is read
292  * in binary.
293  */
294
295 #undef __entry
296 #define __entry field
297
298 #undef TP_printk
299 #define TP_printk(fmt, args...) fmt "\n", args
300
301 #undef __get_dynamic_array
302 #define __get_dynamic_array(field)      \
303                 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
304
305 #undef __get_str
306 #define __get_str(field) (char *)__get_dynamic_array(field)
307
308 #undef __print_flags
309 #define __print_flags(flag, delim, flag_array...)                       \
310         ({                                                              \
311                 static const struct trace_print_flags __flags[] =       \
312                         { flag_array, { -1, NULL }};                    \
313                 ftrace_print_flags_seq(p, delim, flag, __flags);        \
314         })
315
316 #undef __print_symbolic
317 #define __print_symbolic(value, symbol_array...)                        \
318         ({                                                              \
319                 static const struct trace_print_flags symbols[] =       \
320                         { symbol_array, { -1, NULL }};                  \
321                 ftrace_print_symbols_seq(p, value, symbols);            \
322         })
323
324 #undef DECLARE_EVENT_CLASS
325 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
326 static enum print_line_t                                                \
327 ftrace_raw_output_id_##call(int event_id, const char *name,             \
328                             struct trace_iterator *iter, int flags)     \
329 {                                                                       \
330         struct trace_seq *s = &iter->seq;                               \
331         struct ftrace_raw_##call *field;                                \
332         struct trace_entry *entry;                                      \
333         struct trace_seq *p;                                            \
334         int ret;                                                        \
335                                                                         \
336         entry = iter->ent;                                              \
337                                                                         \
338         if (entry->type != event_id) {                                  \
339                 WARN_ON_ONCE(1);                                        \
340                 return TRACE_TYPE_UNHANDLED;                            \
341         }                                                               \
342                                                                         \
343         field = (typeof(field))entry;                                   \
344                                                                         \
345         p = &get_cpu_var(ftrace_event_seq);                             \
346         trace_seq_init(p);                                              \
347         ret = trace_seq_printf(s, "%s: ", name);                        \
348         if (ret)                                                        \
349                 ret = trace_seq_printf(s, print);                       \
350         put_cpu();                                                      \
351         if (!ret)                                                       \
352                 return TRACE_TYPE_PARTIAL_LINE;                         \
353                                                                         \
354         return TRACE_TYPE_HANDLED;                                      \
355 }
356
357 #undef DEFINE_EVENT
358 #define DEFINE_EVENT(template, name, proto, args)                       \
359 static enum print_line_t                                                \
360 ftrace_raw_output_##name(struct trace_iterator *iter, int flags)        \
361 {                                                                       \
362         return ftrace_raw_output_id_##template(event_##name.id,         \
363                                                #name, iter, flags);     \
364 }
365
366 #undef DEFINE_EVENT_PRINT
367 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
368 static enum print_line_t                                                \
369 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)        \
370 {                                                                       \
371         struct trace_seq *s = &iter->seq;                               \
372         struct ftrace_raw_##template *field;                            \
373         struct trace_entry *entry;                                      \
374         struct trace_seq *p;                                            \
375         int ret;                                                        \
376                                                                         \
377         entry = iter->ent;                                              \
378                                                                         \
379         if (entry->type != event_##call.id) {                           \
380                 WARN_ON_ONCE(1);                                        \
381                 return TRACE_TYPE_UNHANDLED;                            \
382         }                                                               \
383                                                                         \
384         field = (typeof(field))entry;                                   \
385                                                                         \
386         p = &get_cpu_var(ftrace_event_seq);                             \
387         trace_seq_init(p);                                              \
388         ret = trace_seq_printf(s, "%s: ", #call);                       \
389         if (ret)                                                        \
390                 ret = trace_seq_printf(s, print);                       \
391         put_cpu();                                                      \
392         if (!ret)                                                       \
393                 return TRACE_TYPE_PARTIAL_LINE;                         \
394                                                                         \
395         return TRACE_TYPE_HANDLED;                                      \
396 }
397
398 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
399
400 #undef __field_ext
401 #define __field_ext(type, item, filter_type)                            \
402         ret = trace_define_field(event_call, #type, #item,              \
403                                  offsetof(typeof(field), item),         \
404                                  sizeof(field.item),                    \
405                                  is_signed_type(type), filter_type);    \
406         if (ret)                                                        \
407                 return ret;
408
409 #undef __field
410 #define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
411
412 #undef __array
413 #define __array(type, item, len)                                        \
414         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
415         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
416                                  offsetof(typeof(field), item),         \
417                                  sizeof(field.item), 0, FILTER_OTHER);  \
418         if (ret)                                                        \
419                 return ret;
420
421 #undef __dynamic_array
422 #define __dynamic_array(type, item, len)                                       \
423         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
424                                  offsetof(typeof(field), __data_loc_##item),   \
425                                  sizeof(field.__data_loc_##item), 0,           \
426                                  FILTER_OTHER);
427
428 #undef __string
429 #define __string(item, src) __dynamic_array(char, item, -1)
430
431 #undef DECLARE_EVENT_CLASS
432 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)    \
433 static int                                                              \
434 ftrace_define_fields_##call(struct ftrace_event_call *event_call)       \
435 {                                                                       \
436         struct ftrace_raw_##call field;                                 \
437         int ret;                                                        \
438                                                                         \
439         ret = trace_define_common_fields(event_call);                   \
440         if (ret)                                                        \
441                 return ret;                                             \
442                                                                         \
443         tstruct;                                                        \
444                                                                         \
445         return ret;                                                     \
446 }
447
448 #undef DEFINE_EVENT
449 #define DEFINE_EVENT(template, name, proto, args)
450
451 #undef DEFINE_EVENT_PRINT
452 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
453         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
454
455 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
456
457 /*
458  * remember the offset of each array from the beginning of the event.
459  */
460
461 #undef __entry
462 #define __entry entry
463
464 #undef __field
465 #define __field(type, item)
466
467 #undef __field_ext
468 #define __field_ext(type, item, filter_type)
469
470 #undef __array
471 #define __array(type, item, len)
472
473 #undef __dynamic_array
474 #define __dynamic_array(type, item, len)                                \
475         __data_offsets->item = __data_size +                            \
476                                offsetof(typeof(*entry), __data);        \
477         __data_offsets->item |= (len * sizeof(type)) << 16;             \
478         __data_size += (len) * sizeof(type);
479
480 #undef __string
481 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
482
483 #undef DECLARE_EVENT_CLASS
484 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
485 static inline int ftrace_get_offsets_##call(                            \
486         struct ftrace_data_offsets_##call *__data_offsets, proto)       \
487 {                                                                       \
488         int __data_size = 0;                                            \
489         struct ftrace_raw_##call __maybe_unused *entry;                 \
490                                                                         \
491         tstruct;                                                        \
492                                                                         \
493         return __data_size;                                             \
494 }
495
496 #undef DEFINE_EVENT
497 #define DEFINE_EVENT(template, name, proto, args)
498
499 #undef DEFINE_EVENT_PRINT
500 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
501         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
502
503 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
504
505 #ifdef CONFIG_EVENT_PROFILE
506
507 /*
508  * Generate the functions needed for tracepoint perf_event support.
509  *
510  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
511  *
512  * static int ftrace_profile_enable_<call>(void)
513  * {
514  *      return register_trace_<call>(ftrace_profile_<call>);
515  * }
516  *
517  * static void ftrace_profile_disable_<call>(void)
518  * {
519  *      unregister_trace_<call>(ftrace_profile_<call>);
520  * }
521  *
522  */
523
524 #undef DECLARE_EVENT_CLASS
525 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
526
527 #undef DEFINE_EVENT
528 #define DEFINE_EVENT(template, name, proto, args)                       \
529                                                                         \
530 static void ftrace_profile_##name(proto);                               \
531                                                                         \
532 static int ftrace_profile_enable_##name(struct ftrace_event_call *unused)\
533 {                                                                       \
534         return register_trace_##name(ftrace_profile_##name);            \
535 }                                                                       \
536                                                                         \
537 static void ftrace_profile_disable_##name(struct ftrace_event_call *unused)\
538 {                                                                       \
539         unregister_trace_##name(ftrace_profile_##name);                 \
540 }
541
542 #undef DEFINE_EVENT_PRINT
543 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
544         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
545
546 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
547
548 #endif
549
550 /*
551  * Stage 4 of the trace events.
552  *
553  * Override the macros in <trace/trace_events.h> to include the following:
554  *
555  * static void ftrace_event_<call>(proto)
556  * {
557  *      event_trace_printk(_RET_IP_, "<call>: " <fmt>);
558  * }
559  *
560  * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
561  * {
562  *      int ret;
563  *
564  *      ret = register_trace_<call>(ftrace_event_<call>);
565  *      if (!ret)
566  *              pr_info("event trace: Could not activate trace point "
567  *                      "probe to  <call>");
568  *      return ret;
569  * }
570  *
571  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
572  * {
573  *      unregister_trace_<call>(ftrace_event_<call>);
574  * }
575  *
576  *
577  * For those macros defined with TRACE_EVENT:
578  *
579  * static struct ftrace_event_call event_<call>;
580  *
581  * static void ftrace_raw_event_<call>(proto)
582  * {
583  *      struct ring_buffer_event *event;
584  *      struct ftrace_raw_<call> *entry; <-- defined in stage 1
585  *      struct ring_buffer *buffer;
586  *      unsigned long irq_flags;
587  *      int pc;
588  *
589  *      local_save_flags(irq_flags);
590  *      pc = preempt_count();
591  *
592  *      event = trace_current_buffer_lock_reserve(&buffer,
593  *                                event_<call>.id,
594  *                                sizeof(struct ftrace_raw_<call>),
595  *                                irq_flags, pc);
596  *      if (!event)
597  *              return;
598  *      entry   = ring_buffer_event_data(event);
599  *
600  *      <assign>;  <-- Here we assign the entries by the __field and
601  *                      __array macros.
602  *
603  *      trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
604  * }
605  *
606  * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
607  * {
608  *      int ret;
609  *
610  *      ret = register_trace_<call>(ftrace_raw_event_<call>);
611  *      if (!ret)
612  *              pr_info("event trace: Could not activate trace point "
613  *                      "probe to <call>");
614  *      return ret;
615  * }
616  *
617  * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
618  * {
619  *      unregister_trace_<call>(ftrace_raw_event_<call>);
620  * }
621  *
622  * static struct trace_event ftrace_event_type_<call> = {
623  *      .trace                  = ftrace_raw_output_<call>, <-- stage 2
624  * };
625  *
626  * static int ftrace_raw_init_event_<call>(struct ftrace_event_call *unused)
627  * {
628  *      int id;
629  *
630  *      id = register_ftrace_event(&ftrace_event_type_<call>);
631  *      if (!id)
632  *              return -ENODEV;
633  *      event_<call>.id = id;
634  *      return 0;
635  * }
636  *
637  * static struct ftrace_event_call __used
638  * __attribute__((__aligned__(4)))
639  * __attribute__((section("_ftrace_events"))) event_<call> = {
640  *      .name                   = "<call>",
641  *      .system                 = "<system>",
642  *      .raw_init               = ftrace_raw_init_event_<call>,
643  *      .regfunc                = ftrace_reg_event_<call>,
644  *      .unregfunc              = ftrace_unreg_event_<call>,
645  *      .show_format            = ftrace_format_<call>,
646  * }
647  *
648  */
649
650 #undef TP_FMT
651 #define TP_FMT(fmt, args...)    fmt "\n", ##args
652
653 #ifdef CONFIG_EVENT_PROFILE
654
655 #define _TRACE_PROFILE_INIT(call)                                       \
656         .profile_count = ATOMIC_INIT(-1),                               \
657         .profile_enable = ftrace_profile_enable_##call,                 \
658         .profile_disable = ftrace_profile_disable_##call,
659
660 #else
661 #define _TRACE_PROFILE_INIT(call)
662 #endif
663
664 #undef __entry
665 #define __entry entry
666
667 #undef __field
668 #define __field(type, item)
669
670 #undef __array
671 #define __array(type, item, len)
672
673 #undef __dynamic_array
674 #define __dynamic_array(type, item, len)                                \
675         __entry->__data_loc_##item = __data_offsets.item;
676
677 #undef __string
678 #define __string(item, src) __dynamic_array(char, item, -1)             \
679
680 #undef __assign_str
681 #define __assign_str(dst, src)                                          \
682         strcpy(__get_str(dst), src);
683
684 #undef DECLARE_EVENT_CLASS
685 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
686                                                                         \
687 static void ftrace_raw_event_id_##call(struct ftrace_event_call *event_call, \
688                                        proto)                           \
689 {                                                                       \
690         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
691         struct ring_buffer_event *event;                                \
692         struct ftrace_raw_##call *entry;                                \
693         struct ring_buffer *buffer;                                     \
694         unsigned long irq_flags;                                        \
695         int __data_size;                                                \
696         int pc;                                                         \
697                                                                         \
698         local_save_flags(irq_flags);                                    \
699         pc = preempt_count();                                           \
700                                                                         \
701         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
702                                                                         \
703         event = trace_current_buffer_lock_reserve(&buffer,              \
704                                  event_call->id,                        \
705                                  sizeof(*entry) + __data_size,          \
706                                  irq_flags, pc);                        \
707         if (!event)                                                     \
708                 return;                                                 \
709         entry   = ring_buffer_event_data(event);                        \
710                                                                         \
711                                                                         \
712         tstruct                                                         \
713                                                                         \
714         { assign; }                                                     \
715                                                                         \
716         if (!filter_current_check_discard(buffer, event_call, entry, event)) \
717                 trace_nowake_buffer_unlock_commit(buffer,               \
718                                                   event, irq_flags, pc); \
719 }
720
721 #undef DEFINE_EVENT
722 #define DEFINE_EVENT(template, call, proto, args)                       \
723                                                                         \
724 static void ftrace_raw_event_##call(proto)                              \
725 {                                                                       \
726         ftrace_raw_event_id_##template(&event_##call, args);            \
727 }                                                                       \
728                                                                         \
729 static int ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)\
730 {                                                                       \
731         int ret;                                                        \
732                                                                         \
733         ret = register_trace_##call(ftrace_raw_event_##call);           \
734         if (ret)                                                        \
735                 pr_info("event trace: Could not activate trace point "  \
736                         "probe to " #call "\n");                        \
737         return ret;                                                     \
738 }                                                                       \
739                                                                         \
740 static void ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)\
741 {                                                                       \
742         unregister_trace_##call(ftrace_raw_event_##call);               \
743 }                                                                       \
744                                                                         \
745 static struct trace_event ftrace_event_type_##call = {                  \
746         .trace                  = ftrace_raw_output_##call,             \
747 };                                                                      \
748                                                                         \
749 static int ftrace_raw_init_event_##call(struct ftrace_event_call *unused)\
750 {                                                                       \
751         int id;                                                         \
752                                                                         \
753         id = register_ftrace_event(&ftrace_event_type_##call);          \
754         if (!id)                                                        \
755                 return -ENODEV;                                         \
756         event_##call.id = id;                                           \
757         INIT_LIST_HEAD(&event_##call.fields);                           \
758         return 0;                                                       \
759 }
760
761 #undef DEFINE_EVENT_PRINT
762 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
763         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
764
765 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
766
767 #undef DECLARE_EVENT_CLASS
768 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
769
770 #undef DEFINE_EVENT
771 #define DEFINE_EVENT(template, call, proto, args)                       \
772                                                                         \
773 static struct ftrace_event_call __used                                  \
774 __attribute__((__aligned__(4)))                                         \
775 __attribute__((section("_ftrace_events"))) event_##call = {             \
776         .name                   = #call,                                \
777         .system                 = __stringify(TRACE_SYSTEM),            \
778         .event                  = &ftrace_event_type_##call,            \
779         .raw_init               = ftrace_raw_init_event_##call,         \
780         .regfunc                = ftrace_raw_reg_event_##call,          \
781         .unregfunc              = ftrace_raw_unreg_event_##call,        \
782         .show_format            = ftrace_format_##template,             \
783         .define_fields          = ftrace_define_fields_##template,      \
784         _TRACE_PROFILE_INIT(call)                                       \
785 }
786
787 #undef DEFINE_EVENT_PRINT
788 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)          \
789                                                                         \
790 static struct ftrace_event_call __used                                  \
791 __attribute__((__aligned__(4)))                                         \
792 __attribute__((section("_ftrace_events"))) event_##call = {             \
793         .name                   = #call,                                \
794         .system                 = __stringify(TRACE_SYSTEM),            \
795         .event                  = &ftrace_event_type_##call,            \
796         .raw_init               = ftrace_raw_init_event_##call,         \
797         .regfunc                = ftrace_raw_reg_event_##call,          \
798         .unregfunc              = ftrace_raw_unreg_event_##call,        \
799         .show_format            = ftrace_format_##call,                 \
800         .define_fields          = ftrace_define_fields_##template,      \
801         _TRACE_PROFILE_INIT(call)                                       \
802 }
803
804 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
805
806 /*
807  * Define the insertion callback to profile events
808  *
809  * The job is very similar to ftrace_raw_event_<call> except that we don't
810  * insert in the ring buffer but in a perf counter.
811  *
812  * static void ftrace_profile_<call>(proto)
813  * {
814  *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
815  *      struct ftrace_event_call *event_call = &event_<call>;
816  *      extern void perf_tp_event(int, u64, u64, void *, int);
817  *      struct ftrace_raw_##call *entry;
818  *      struct perf_trace_buf *trace_buf;
819  *      u64 __addr = 0, __count = 1;
820  *      unsigned long irq_flags;
821  *      struct trace_entry *ent;
822  *      int __entry_size;
823  *      int __data_size;
824  *      int __cpu
825  *      int pc;
826  *
827  *      pc = preempt_count();
828  *
829  *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
830  *
831  *      // Below we want to get the aligned size by taking into account
832  *      // the u32 field that will later store the buffer size
833  *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
834  *                           sizeof(u64));
835  *      __entry_size -= sizeof(u32);
836  *
837  *      // Protect the non nmi buffer
838  *      // This also protects the rcu read side
839  *      local_irq_save(irq_flags);
840  *      __cpu = smp_processor_id();
841  *
842  *      if (in_nmi())
843  *              trace_buf = rcu_dereference(perf_trace_buf_nmi);
844  *      else
845  *              trace_buf = rcu_dereference(perf_trace_buf);
846  *
847  *      if (!trace_buf)
848  *              goto end;
849  *
850  *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
851  *
852  *      // Avoid recursion from perf that could mess up the buffer
853  *      if (trace_buf->recursion++)
854  *              goto end_recursion;
855  *
856  *      raw_data = trace_buf->buf;
857  *
858  *      // Make recursion update visible before entering perf_tp_event
859  *      // so that we protect from perf recursions.
860  *
861  *      barrier();
862  *
863  *      //zero dead bytes from alignment to avoid stack leak to userspace:
864  *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
865  *      entry = (struct ftrace_raw_<call> *)raw_data;
866  *      ent = &entry->ent;
867  *      tracing_generic_entry_update(ent, irq_flags, pc);
868  *      ent->type = event_call->id;
869  *
870  *      <tstruct> <- do some jobs with dynamic arrays
871  *
872  *      <assign>  <- affect our values
873  *
874  *      perf_tp_event(event_call->id, __addr, __count, entry,
875  *                   __entry_size);  <- submit them to perf counter
876  *
877  * }
878  */
879
880 #ifdef CONFIG_EVENT_PROFILE
881
882 #undef __perf_addr
883 #define __perf_addr(a) __addr = (a)
884
885 #undef __perf_count
886 #define __perf_count(c) __count = (c)
887
888 #undef DECLARE_EVENT_CLASS
889 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)  \
890 static void                                                             \
891 ftrace_profile_templ_##call(struct ftrace_event_call *event_call,       \
892                             proto)                                      \
893 {                                                                       \
894         struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
895         extern int perf_swevent_get_recursion_context(void);            \
896         extern void perf_swevent_put_recursion_context(int rctx);       \
897         extern void perf_tp_event(int, u64, u64, void *, int);          \
898         struct ftrace_raw_##call *entry;                                \
899         u64 __addr = 0, __count = 1;                                    \
900         unsigned long irq_flags;                                        \
901         struct trace_entry *ent;                                        \
902         int __entry_size;                                               \
903         int __data_size;                                                \
904         char *trace_buf;                                                \
905         char *raw_data;                                                 \
906         int __cpu;                                                      \
907         int rctx;                                                       \
908         int pc;                                                         \
909                                                                         \
910         pc = preempt_count();                                           \
911                                                                         \
912         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
913         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
914                              sizeof(u64));                              \
915         __entry_size -= sizeof(u32);                                    \
916                                                                         \
917         if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE,           \
918                       "profile buffer not large enough"))               \
919                 return;                                                 \
920                                                                         \
921         local_irq_save(irq_flags);                                      \
922                                                                         \
923         rctx = perf_swevent_get_recursion_context();                    \
924         if (rctx < 0)                                                   \
925                 goto end_recursion;                                     \
926                                                                         \
927         __cpu = smp_processor_id();                                     \
928                                                                         \
929         if (in_nmi())                                                   \
930                 trace_buf = rcu_dereference(perf_trace_buf_nmi);        \
931         else                                                            \
932                 trace_buf = rcu_dereference(perf_trace_buf);            \
933                                                                         \
934         if (!trace_buf)                                                 \
935                 goto end;                                               \
936                                                                         \
937         raw_data = per_cpu_ptr(trace_buf, __cpu);                       \
938                                                                         \
939         *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;         \
940         entry = (struct ftrace_raw_##call *)raw_data;                   \
941         ent = &entry->ent;                                              \
942         tracing_generic_entry_update(ent, irq_flags, pc);               \
943         ent->type = event_call->id;                                     \
944                                                                         \
945         tstruct                                                         \
946                                                                         \
947         { assign; }                                                     \
948                                                                         \
949         perf_tp_event(event_call->id, __addr, __count, entry,           \
950                              __entry_size);                             \
951                                                                         \
952 end:                                                                    \
953         perf_swevent_put_recursion_context(rctx);                       \
954 end_recursion:                                                          \
955         local_irq_restore(irq_flags);                                   \
956                                                                         \
957 }
958
959 #undef DEFINE_EVENT
960 #define DEFINE_EVENT(template, call, proto, args)               \
961 static void ftrace_profile_##call(proto)                        \
962 {                                                               \
963         struct ftrace_event_call *event_call = &event_##call;   \
964                                                                 \
965         ftrace_profile_templ_##template(event_call, args);      \
966 }
967
968 #undef DEFINE_EVENT_PRINT
969 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)  \
970         DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
971
972 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
973 #endif /* CONFIG_EVENT_PROFILE */
974
975 #undef _TRACE_PROFILE_INIT
976