tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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) \
208static int \
209ftrace_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 \
220static int \
221ftrace_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) \
240static int \
241ftrace_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) \
326static enum print_line_t \
327ftrace_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) \
359static enum print_line_t \
360ftrace_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) \
368static enum print_line_t \
369ftrace_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), \
418 is_signed_type(type), FILTER_OTHER); \
419 if (ret) \
420 return ret;
421
422#undef __dynamic_array
423#define __dynamic_array(type, item, len) \
424 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
425 offsetof(typeof(field), __data_loc_##item), \
426 sizeof(field.__data_loc_##item), \
427 is_signed_type(type), FILTER_OTHER);
428
429#undef __string
430#define __string(item, src) __dynamic_array(char, item, -1)
431
432#undef DECLARE_EVENT_CLASS
433#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
434static int \
435ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
436{ \
437 struct ftrace_raw_##call field; \
438 int ret; \
439 \
440 tstruct; \
441 \
442 return ret; \
443}
444
445#undef DEFINE_EVENT
446#define DEFINE_EVENT(template, name, proto, args)
447
448#undef DEFINE_EVENT_PRINT
449#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
450 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
451
452#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
453
454/*
455 * remember the offset of each array from the beginning of the event.
456 */
457
458#undef __entry
459#define __entry entry
460
461#undef __field
462#define __field(type, item)
463
464#undef __field_ext
465#define __field_ext(type, item, filter_type)
466
467#undef __array
468#define __array(type, item, len)
469
470#undef __dynamic_array
471#define __dynamic_array(type, item, len) \
472 __data_offsets->item = __data_size + \
473 offsetof(typeof(*entry), __data); \
474 __data_offsets->item |= (len * sizeof(type)) << 16; \
475 __data_size += (len) * sizeof(type);
476
477#undef __string
478#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
479
480#undef DECLARE_EVENT_CLASS
481#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
482static inline int ftrace_get_offsets_##call( \
483 struct ftrace_data_offsets_##call *__data_offsets, proto) \
484{ \
485 int __data_size = 0; \
486 struct ftrace_raw_##call __maybe_unused *entry; \
487 \
488 tstruct; \
489 \
490 return __data_size; \
491}
492
493#undef DEFINE_EVENT
494#define DEFINE_EVENT(template, name, proto, args)
495
496#undef DEFINE_EVENT_PRINT
497#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
498 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
499
500#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
501
502#ifdef CONFIG_EVENT_PROFILE
503
504/*
505 * Generate the functions needed for tracepoint perf_event support.
506 *
507 * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
508 *
509 * static int ftrace_profile_enable_<call>(void)
510 * {
511 * return register_trace_<call>(ftrace_profile_<call>);
512 * }
513 *
514 * static void ftrace_profile_disable_<call>(void)
515 * {
516 * unregister_trace_<call>(ftrace_profile_<call>);
517 * }
518 *
519 */
520
521#undef DECLARE_EVENT_CLASS
522#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
523
524#undef DEFINE_EVENT
525#define DEFINE_EVENT(template, name, proto, args) \
526 \
527static void ftrace_profile_##name(proto); \
528 \
529static int ftrace_profile_enable_##name(struct ftrace_event_call *unused)\
530{ \
531 return register_trace_##name(ftrace_profile_##name); \
532} \
533 \
534static void ftrace_profile_disable_##name(struct ftrace_event_call *unused)\
535{ \
536 unregister_trace_##name(ftrace_profile_##name); \
537}
538
539#undef DEFINE_EVENT_PRINT
540#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
541 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
542
543#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
544
545#endif
546
547/*
548 * Stage 4 of the trace events.
549 *
550 * Override the macros in <trace/trace_events.h> to include the following:
551 *
552 * static void ftrace_event_<call>(proto)
553 * {
554 * event_trace_printk(_RET_IP_, "<call>: " <fmt>);
555 * }
556 *
557 * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
558 * {
559 * return register_trace_<call>(ftrace_event_<call>);
560 * }
561 *
562 * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
563 * {
564 * unregister_trace_<call>(ftrace_event_<call>);
565 * }
566 *
567 *
568 * For those macros defined with TRACE_EVENT:
569 *
570 * static struct ftrace_event_call event_<call>;
571 *
572 * static void ftrace_raw_event_<call>(proto)
573 * {
574 * struct ring_buffer_event *event;
575 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
576 * struct ring_buffer *buffer;
577 * unsigned long irq_flags;
578 * int pc;
579 *
580 * local_save_flags(irq_flags);
581 * pc = preempt_count();
582 *
583 * event = trace_current_buffer_lock_reserve(&buffer,
584 * event_<call>.id,
585 * sizeof(struct ftrace_raw_<call>),
586 * irq_flags, pc);
587 * if (!event)
588 * return;
589 * entry = ring_buffer_event_data(event);
590 *
591 * <assign>; <-- Here we assign the entries by the __field and
592 * __array macros.
593 *
594 * trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
595 * }
596 *
597 * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
598 * {
599 * int ret;
600 *
601 * ret = register_trace_<call>(ftrace_raw_event_<call>);
602 * if (!ret)
603 * pr_info("event trace: Could not activate trace point "
604 * "probe to <call>");
605 * return ret;
606 * }
607 *
608 * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
609 * {
610 * unregister_trace_<call>(ftrace_raw_event_<call>);
611 * }
612 *
613 * static struct trace_event ftrace_event_type_<call> = {
614 * .trace = ftrace_raw_output_<call>, <-- stage 2
615 * };
616 *
617 * static struct ftrace_event_call __used
618 * __attribute__((__aligned__(4)))
619 * __attribute__((section("_ftrace_events"))) event_<call> = {
620 * .name = "<call>",
621 * .system = "<system>",
622 * .raw_init = trace_event_raw_init,
623 * .regfunc = ftrace_reg_event_<call>,
624 * .unregfunc = ftrace_unreg_event_<call>,
625 * .show_format = ftrace_format_<call>,
626 * }
627 *
628 */
629
630#ifdef CONFIG_EVENT_PROFILE
631
632#define _TRACE_PROFILE_INIT(call) \
633 .profile_enable = ftrace_profile_enable_##call, \
634 .profile_disable = ftrace_profile_disable_##call,
635
636#else
637#define _TRACE_PROFILE_INIT(call)
638#endif
639
640#undef __entry
641#define __entry entry
642
643#undef __field
644#define __field(type, item)
645
646#undef __array
647#define __array(type, item, len)
648
649#undef __dynamic_array
650#define __dynamic_array(type, item, len) \
651 __entry->__data_loc_##item = __data_offsets.item;
652
653#undef __string
654#define __string(item, src) __dynamic_array(char, item, -1) \
655
656#undef __assign_str
657#define __assign_str(dst, src) \
658 strcpy(__get_str(dst), src);
659
660#undef DECLARE_EVENT_CLASS
661#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
662 \
663static void ftrace_raw_event_id_##call(struct ftrace_event_call *event_call, \
664 proto) \
665{ \
666 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
667 struct ring_buffer_event *event; \
668 struct ftrace_raw_##call *entry; \
669 struct ring_buffer *buffer; \
670 unsigned long irq_flags; \
671 int __data_size; \
672 int pc; \
673 \
674 local_save_flags(irq_flags); \
675 pc = preempt_count(); \
676 \
677 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
678 \
679 event = trace_current_buffer_lock_reserve(&buffer, \
680 event_call->id, \
681 sizeof(*entry) + __data_size, \
682 irq_flags, pc); \
683 if (!event) \
684 return; \
685 entry = ring_buffer_event_data(event); \
686 \
687 \
688 tstruct \
689 \
690 { assign; } \
691 \
692 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
693 trace_nowake_buffer_unlock_commit(buffer, \
694 event, irq_flags, pc); \
695}
696
697#undef DEFINE_EVENT
698#define DEFINE_EVENT(template, call, proto, args) \
699 \
700static void ftrace_raw_event_##call(proto) \
701{ \
702 ftrace_raw_event_id_##template(&event_##call, args); \
703} \
704 \
705static int ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)\
706{ \
707 return register_trace_##call(ftrace_raw_event_##call); \
708} \
709 \
710static void ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)\
711{ \
712 unregister_trace_##call(ftrace_raw_event_##call); \
713} \
714 \
715static struct trace_event ftrace_event_type_##call = { \
716 .trace = ftrace_raw_output_##call, \
717};
718
719#undef DEFINE_EVENT_PRINT
720#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
721 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
722
723#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
724
725#undef DECLARE_EVENT_CLASS
726#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
727
728#undef DEFINE_EVENT
729#define DEFINE_EVENT(template, call, proto, args) \
730 \
731static struct ftrace_event_call __used \
732__attribute__((__aligned__(4))) \
733__attribute__((section("_ftrace_events"))) event_##call = { \
734 .name = #call, \
735 .system = __stringify(TRACE_SYSTEM), \
736 .event = &ftrace_event_type_##call, \
737 .raw_init = trace_event_raw_init, \
738 .regfunc = ftrace_raw_reg_event_##call, \
739 .unregfunc = ftrace_raw_unreg_event_##call, \
740 .show_format = ftrace_format_##template, \
741 .define_fields = ftrace_define_fields_##template, \
742 _TRACE_PROFILE_INIT(call) \
743}
744
745#undef DEFINE_EVENT_PRINT
746#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
747 \
748static struct ftrace_event_call __used \
749__attribute__((__aligned__(4))) \
750__attribute__((section("_ftrace_events"))) event_##call = { \
751 .name = #call, \
752 .system = __stringify(TRACE_SYSTEM), \
753 .event = &ftrace_event_type_##call, \
754 .raw_init = trace_event_raw_init, \
755 .regfunc = ftrace_raw_reg_event_##call, \
756 .unregfunc = ftrace_raw_unreg_event_##call, \
757 .show_format = ftrace_format_##call, \
758 .define_fields = ftrace_define_fields_##template, \
759 _TRACE_PROFILE_INIT(call) \
760}
761
762#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
763
764/*
765 * Define the insertion callback to profile events
766 *
767 * The job is very similar to ftrace_raw_event_<call> except that we don't
768 * insert in the ring buffer but in a perf counter.
769 *
770 * static void ftrace_profile_<call>(proto)
771 * {
772 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
773 * struct ftrace_event_call *event_call = &event_<call>;
774 * extern void perf_tp_event(int, u64, u64, void *, int);
775 * struct ftrace_raw_##call *entry;
776 * struct perf_trace_buf *trace_buf;
777 * u64 __addr = 0, __count = 1;
778 * unsigned long irq_flags;
779 * struct trace_entry *ent;
780 * int __entry_size;
781 * int __data_size;
782 * int __cpu
783 * int pc;
784 *
785 * pc = preempt_count();
786 *
787 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
788 *
789 * // Below we want to get the aligned size by taking into account
790 * // the u32 field that will later store the buffer size
791 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
792 * sizeof(u64));
793 * __entry_size -= sizeof(u32);
794 *
795 * // Protect the non nmi buffer
796 * // This also protects the rcu read side
797 * local_irq_save(irq_flags);
798 * __cpu = smp_processor_id();
799 *
800 * if (in_nmi())
801 * trace_buf = rcu_dereference(perf_trace_buf_nmi);
802 * else
803 * trace_buf = rcu_dereference(perf_trace_buf);
804 *
805 * if (!trace_buf)
806 * goto end;
807 *
808 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
809 *
810 * // Avoid recursion from perf that could mess up the buffer
811 * if (trace_buf->recursion++)
812 * goto end_recursion;
813 *
814 * raw_data = trace_buf->buf;
815 *
816 * // Make recursion update visible before entering perf_tp_event
817 * // so that we protect from perf recursions.
818 *
819 * barrier();
820 *
821 * //zero dead bytes from alignment to avoid stack leak to userspace:
822 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
823 * entry = (struct ftrace_raw_<call> *)raw_data;
824 * ent = &entry->ent;
825 * tracing_generic_entry_update(ent, irq_flags, pc);
826 * ent->type = event_call->id;
827 *
828 * <tstruct> <- do some jobs with dynamic arrays
829 *
830 * <assign> <- affect our values
831 *
832 * perf_tp_event(event_call->id, __addr, __count, entry,
833 * __entry_size); <- submit them to perf counter
834 *
835 * }
836 */
837
838#ifdef CONFIG_EVENT_PROFILE
839
840#undef __perf_addr
841#define __perf_addr(a) __addr = (a)
842
843#undef __perf_count
844#define __perf_count(c) __count = (c)
845
846#undef DECLARE_EVENT_CLASS
847#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
848static void \
849ftrace_profile_templ_##call(struct ftrace_event_call *event_call, \
850 proto) \
851{ \
852 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
853 extern int perf_swevent_get_recursion_context(void); \
854 extern void perf_swevent_put_recursion_context(int rctx); \
855 extern void perf_tp_event(int, u64, u64, void *, int); \
856 struct ftrace_raw_##call *entry; \
857 u64 __addr = 0, __count = 1; \
858 unsigned long irq_flags; \
859 struct trace_entry *ent; \
860 int __entry_size; \
861 int __data_size; \
862 char *trace_buf; \
863 char *raw_data; \
864 int __cpu; \
865 int rctx; \
866 int pc; \
867 \
868 pc = preempt_count(); \
869 \
870 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
871 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
872 sizeof(u64)); \
873 __entry_size -= sizeof(u32); \
874 \
875 if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE, \
876 "profile buffer not large enough")) \
877 return; \
878 \
879 local_irq_save(irq_flags); \
880 \
881 rctx = perf_swevent_get_recursion_context(); \
882 if (rctx < 0) \
883 goto end_recursion; \
884 \
885 __cpu = smp_processor_id(); \
886 \
887 if (in_nmi()) \
888 trace_buf = rcu_dereference(perf_trace_buf_nmi); \
889 else \
890 trace_buf = rcu_dereference(perf_trace_buf); \
891 \
892 if (!trace_buf) \
893 goto end; \
894 \
895 raw_data = per_cpu_ptr(trace_buf, __cpu); \
896 \
897 *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
898 entry = (struct ftrace_raw_##call *)raw_data; \
899 ent = &entry->ent; \
900 tracing_generic_entry_update(ent, irq_flags, pc); \
901 ent->type = event_call->id; \
902 \
903 tstruct \
904 \
905 { assign; } \
906 \
907 perf_tp_event(event_call->id, __addr, __count, entry, \
908 __entry_size); \
909 \
910end: \
911 perf_swevent_put_recursion_context(rctx); \
912end_recursion: \
913 local_irq_restore(irq_flags); \
914}
915
916#undef DEFINE_EVENT
917#define DEFINE_EVENT(template, call, proto, args) \
918static void ftrace_profile_##call(proto) \
919{ \
920 struct ftrace_event_call *event_call = &event_##call; \
921 \
922 ftrace_profile_templ_##template(event_call, args); \
923}
924
925#undef DEFINE_EVENT_PRINT
926#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
927 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
928
929#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
930#endif /* CONFIG_EVENT_PROFILE */
931
932#undef _TRACE_PROFILE_INIT
933