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55c1fd1bbc3d7470af712db6a3cf772bcb899537
[deliverable/linux.git] / include / trace / ftrace.h
1 /*
2 * Stage 1 of the trace events.
3 *
4 * Override the macros in <trace/trace_events.h> to include the following:
5 *
6 * struct ftrace_raw_<call> {
7 * struct trace_entry ent;
8 * <type> <item>;
9 * <type2> <item2>[<len>];
10 * [...]
11 * };
12 *
13 * The <type> <item> is created by the __field(type, item) macro or
14 * the __array(type2, item2, len) macro.
15 * We simply do "type item;", and that will create the fields
16 * in the structure.
17 */
18
19 #include <linux/ftrace_event.h>
20
21 /*
22 * DECLARE_EVENT_CLASS can be used to add a generic function
23 * handlers for events. That is, if all events have the same
24 * parameters and just have distinct trace points.
25 * Each tracepoint can be defined with DEFINE_EVENT and that
26 * will map the DECLARE_EVENT_CLASS to the tracepoint.
27 *
28 * TRACE_EVENT is a one to one mapping between tracepoint and template.
29 */
30 #undef TRACE_EVENT
31 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
32 DECLARE_EVENT_CLASS(name, \
33 PARAMS(proto), \
34 PARAMS(args), \
35 PARAMS(tstruct), \
36 PARAMS(assign), \
37 PARAMS(print)); \
38 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
39
40
41 #undef __field
42 #define __field(type, item) type item;
43
44 #undef __field_ext
45 #define __field_ext(type, item, filter_type) type item;
46
47 #undef __array
48 #define __array(type, item, len) type item[len];
49
50 #undef __dynamic_array
51 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
52
53 #undef __string
54 #define __string(item, src) __dynamic_array(char, item, -1)
55
56 #undef TP_STRUCT__entry
57 #define TP_STRUCT__entry(args...) args
58
59 #undef DECLARE_EVENT_CLASS
60 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
61 struct ftrace_raw_##name { \
62 struct trace_entry ent; \
63 tstruct \
64 char __data[0]; \
65 }; \
66 \
67 static struct ftrace_event_class event_class_##name;
68
69 #undef DEFINE_EVENT
70 #define DEFINE_EVENT(template, name, proto, args) \
71 static struct ftrace_event_call __used \
72 __attribute__((__aligned__(4))) event_##name
73
74 #undef DEFINE_EVENT_PRINT
75 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
76 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
77
78 #undef __cpparg
79 #define __cpparg(arg...) arg
80
81 /* Callbacks are meaningless to ftrace. */
82 #undef TRACE_EVENT_FN
83 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
84 assign, print, reg, unreg) \
85 TRACE_EVENT(name, __cpparg(proto), __cpparg(args), \
86 __cpparg(tstruct), __cpparg(assign), __cpparg(print)) \
87
88 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
89
90
91 /*
92 * Stage 2 of the trace events.
93 *
94 * Include the following:
95 *
96 * struct ftrace_data_offsets_<call> {
97 * u32 <item1>;
98 * u32 <item2>;
99 * [...]
100 * };
101 *
102 * The __dynamic_array() macro will create each u32 <item>, this is
103 * to keep the offset of each array from the beginning of the event.
104 * The size of an array is also encoded, in the higher 16 bits of <item>.
105 */
106
107 #undef __field
108 #define __field(type, item)
109
110 #undef __field_ext
111 #define __field_ext(type, item, filter_type)
112
113 #undef __array
114 #define __array(type, item, len)
115
116 #undef __dynamic_array
117 #define __dynamic_array(type, item, len) u32 item;
118
119 #undef __string
120 #define __string(item, src) __dynamic_array(char, item, -1)
121
122 #undef DECLARE_EVENT_CLASS
123 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
124 struct ftrace_data_offsets_##call { \
125 tstruct; \
126 };
127
128 #undef DEFINE_EVENT
129 #define DEFINE_EVENT(template, name, proto, args)
130
131 #undef DEFINE_EVENT_PRINT
132 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
133 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
134
135 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
136
137 /*
138 * Stage 3 of the trace events.
139 *
140 * Override the macros in <trace/trace_events.h> to include the following:
141 *
142 * enum print_line_t
143 * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
144 * {
145 * struct trace_seq *s = &iter->seq;
146 * struct ftrace_raw_<call> *field; <-- defined in stage 1
147 * struct trace_entry *entry;
148 * struct trace_seq *p;
149 * int ret;
150 *
151 * entry = iter->ent;
152 *
153 * if (entry->type != event_<call>->event.type) {
154 * WARN_ON_ONCE(1);
155 * return TRACE_TYPE_UNHANDLED;
156 * }
157 *
158 * field = (typeof(field))entry;
159 *
160 * p = &get_cpu_var(ftrace_event_seq);
161 * trace_seq_init(p);
162 * ret = trace_seq_printf(s, "%s: ", <call>);
163 * if (ret)
164 * ret = trace_seq_printf(s, <TP_printk> "\n");
165 * put_cpu();
166 * if (!ret)
167 * return TRACE_TYPE_PARTIAL_LINE;
168 *
169 * return TRACE_TYPE_HANDLED;
170 * }
171 *
172 * This is the method used to print the raw event to the trace
173 * output format. Note, this is not needed if the data is read
174 * in binary.
175 */
176
177 #undef __entry
178 #define __entry field
179
180 #undef TP_printk
181 #define TP_printk(fmt, args...) fmt "\n", args
182
183 #undef __get_dynamic_array
184 #define __get_dynamic_array(field) \
185 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
186
187 #undef __get_str
188 #define __get_str(field) (char *)__get_dynamic_array(field)
189
190 #undef __print_flags
191 #define __print_flags(flag, delim, flag_array...) \
192 ({ \
193 static const struct trace_print_flags __flags[] = \
194 { flag_array, { -1, NULL }}; \
195 ftrace_print_flags_seq(p, delim, flag, __flags); \
196 })
197
198 #undef __print_symbolic
199 #define __print_symbolic(value, symbol_array...) \
200 ({ \
201 static const struct trace_print_flags symbols[] = \
202 { symbol_array, { -1, NULL }}; \
203 ftrace_print_symbols_seq(p, value, symbols); \
204 })
205
206 #undef __print_hex
207 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
208
209 #undef DECLARE_EVENT_CLASS
210 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
211 static notrace enum print_line_t \
212 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
213 struct trace_event *trace_event) \
214 { \
215 struct ftrace_event_call *event; \
216 struct trace_seq *s = &iter->seq; \
217 struct ftrace_raw_##call *field; \
218 struct trace_entry *entry; \
219 struct trace_seq *p; \
220 int ret; \
221 \
222 event = container_of(trace_event, struct ftrace_event_call, \
223 event); \
224 \
225 entry = iter->ent; \
226 \
227 if (entry->type != event->event.type) { \
228 WARN_ON_ONCE(1); \
229 return TRACE_TYPE_UNHANDLED; \
230 } \
231 \
232 field = (typeof(field))entry; \
233 \
234 p = &get_cpu_var(ftrace_event_seq); \
235 trace_seq_init(p); \
236 ret = trace_seq_printf(s, "%s: ", event->name); \
237 if (ret) \
238 ret = trace_seq_printf(s, print); \
239 put_cpu(); \
240 if (!ret) \
241 return TRACE_TYPE_PARTIAL_LINE; \
242 \
243 return TRACE_TYPE_HANDLED; \
244 } \
245 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
246 .trace = ftrace_raw_output_##call, \
247 };
248
249 #undef DEFINE_EVENT_PRINT
250 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
251 static notrace enum print_line_t \
252 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
253 struct trace_event *event) \
254 { \
255 struct trace_seq *s = &iter->seq; \
256 struct ftrace_raw_##template *field; \
257 struct trace_entry *entry; \
258 struct trace_seq *p; \
259 int ret; \
260 \
261 entry = iter->ent; \
262 \
263 if (entry->type != event_##call.event.type) { \
264 WARN_ON_ONCE(1); \
265 return TRACE_TYPE_UNHANDLED; \
266 } \
267 \
268 field = (typeof(field))entry; \
269 \
270 p = &get_cpu_var(ftrace_event_seq); \
271 trace_seq_init(p); \
272 ret = trace_seq_printf(s, "%s: ", #call); \
273 if (ret) \
274 ret = trace_seq_printf(s, print); \
275 put_cpu(); \
276 if (!ret) \
277 return TRACE_TYPE_PARTIAL_LINE; \
278 \
279 return TRACE_TYPE_HANDLED; \
280 } \
281 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
282 .trace = ftrace_raw_output_##call, \
283 };
284
285 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
286
287 #undef __field_ext
288 #define __field_ext(type, item, filter_type) \
289 ret = trace_define_field(event_call, #type, #item, \
290 offsetof(typeof(field), item), \
291 sizeof(field.item), \
292 is_signed_type(type), filter_type); \
293 if (ret) \
294 return ret;
295
296 #undef __field
297 #define __field(type, item) __field_ext(type, item, FILTER_OTHER)
298
299 #undef __array
300 #define __array(type, item, len) \
301 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
302 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
303 offsetof(typeof(field), item), \
304 sizeof(field.item), \
305 is_signed_type(type), FILTER_OTHER); \
306 if (ret) \
307 return ret;
308
309 #undef __dynamic_array
310 #define __dynamic_array(type, item, len) \
311 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
312 offsetof(typeof(field), __data_loc_##item), \
313 sizeof(field.__data_loc_##item), \
314 is_signed_type(type), FILTER_OTHER);
315
316 #undef __string
317 #define __string(item, src) __dynamic_array(char, item, -1)
318
319 #undef DECLARE_EVENT_CLASS
320 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
321 static int notrace \
322 ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
323 { \
324 struct ftrace_raw_##call field; \
325 int ret; \
326 \
327 tstruct; \
328 \
329 return ret; \
330 }
331
332 #undef DEFINE_EVENT
333 #define DEFINE_EVENT(template, name, proto, args)
334
335 #undef DEFINE_EVENT_PRINT
336 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
337 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
338
339 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
340
341 /*
342 * remember the offset of each array from the beginning of the event.
343 */
344
345 #undef __entry
346 #define __entry entry
347
348 #undef __field
349 #define __field(type, item)
350
351 #undef __field_ext
352 #define __field_ext(type, item, filter_type)
353
354 #undef __array
355 #define __array(type, item, len)
356
357 #undef __dynamic_array
358 #define __dynamic_array(type, item, len) \
359 __data_offsets->item = __data_size + \
360 offsetof(typeof(*entry), __data); \
361 __data_offsets->item |= (len * sizeof(type)) << 16; \
362 __data_size += (len) * sizeof(type);
363
364 #undef __string
365 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
366
367 #undef DECLARE_EVENT_CLASS
368 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
369 static inline notrace int ftrace_get_offsets_##call( \
370 struct ftrace_data_offsets_##call *__data_offsets, proto) \
371 { \
372 int __data_size = 0; \
373 struct ftrace_raw_##call __maybe_unused *entry; \
374 \
375 tstruct; \
376 \
377 return __data_size; \
378 }
379
380 #undef DEFINE_EVENT
381 #define DEFINE_EVENT(template, name, proto, args)
382
383 #undef DEFINE_EVENT_PRINT
384 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
385 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
386
387 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
388
389 /*
390 * Stage 4 of the trace events.
391 *
392 * Override the macros in <trace/trace_events.h> to include the following:
393 *
394 * For those macros defined with TRACE_EVENT:
395 *
396 * static struct ftrace_event_call event_<call>;
397 *
398 * static void ftrace_raw_event_<call>(void *__data, proto)
399 * {
400 * struct ftrace_event_call *event_call = __data;
401 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
402 * struct ring_buffer_event *event;
403 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
404 * struct ring_buffer *buffer;
405 * unsigned long irq_flags;
406 * int __data_size;
407 * int pc;
408 *
409 * local_save_flags(irq_flags);
410 * pc = preempt_count();
411 *
412 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
413 *
414 * event = trace_current_buffer_lock_reserve(&buffer,
415 * event_<call>->event.type,
416 * sizeof(*entry) + __data_size,
417 * irq_flags, pc);
418 * if (!event)
419 * return;
420 * entry = ring_buffer_event_data(event);
421 *
422 * { <assign>; } <-- Here we assign the entries by the __field and
423 * __array macros.
424 *
425 * if (!filter_current_check_discard(buffer, event_call, entry, event))
426 * trace_current_buffer_unlock_commit(buffer,
427 * event, irq_flags, pc);
428 * }
429 *
430 * static struct trace_event ftrace_event_type_<call> = {
431 * .trace = ftrace_raw_output_<call>, <-- stage 2
432 * };
433 *
434 * static const char print_fmt_<call>[] = <TP_printk>;
435 *
436 * static struct ftrace_event_class __used event_class_<template> = {
437 * .system = "<system>",
438 * .define_fields = ftrace_define_fields_<call>,
439 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
440 * .raw_init = trace_event_raw_init,
441 * .probe = ftrace_raw_event_##call,
442 * .reg = ftrace_event_reg,
443 * };
444 *
445 * static struct ftrace_event_call __used
446 * __attribute__((__aligned__(4)))
447 * __attribute__((section("_ftrace_events"))) event_<call> = {
448 * .name = "<call>",
449 * .class = event_class_<template>,
450 * .event = &ftrace_event_type_<call>,
451 * .print_fmt = print_fmt_<call>,
452 * };
453 *
454 */
455
456 #ifdef CONFIG_PERF_EVENTS
457
458 #define _TRACE_PERF_PROTO(call, proto) \
459 static notrace void \
460 perf_trace_##call(void *__data, proto);
461
462 #define _TRACE_PERF_INIT(call) \
463 .perf_probe = perf_trace_##call,
464
465 #else
466 #define _TRACE_PERF_PROTO(call, proto)
467 #define _TRACE_PERF_INIT(call)
468 #endif /* CONFIG_PERF_EVENTS */
469
470 #undef __entry
471 #define __entry entry
472
473 #undef __field
474 #define __field(type, item)
475
476 #undef __array
477 #define __array(type, item, len)
478
479 #undef __dynamic_array
480 #define __dynamic_array(type, item, len) \
481 __entry->__data_loc_##item = __data_offsets.item;
482
483 #undef __string
484 #define __string(item, src) __dynamic_array(char, item, -1) \
485
486 #undef __assign_str
487 #define __assign_str(dst, src) \
488 strcpy(__get_str(dst), src);
489
490 #undef TP_fast_assign
491 #define TP_fast_assign(args...) args
492
493 #undef TP_perf_assign
494 #define TP_perf_assign(args...)
495
496 #undef DECLARE_EVENT_CLASS
497 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
498 \
499 static notrace void \
500 ftrace_raw_event_##call(void *__data, proto) \
501 { \
502 struct ftrace_event_call *event_call = __data; \
503 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
504 struct ring_buffer_event *event; \
505 struct ftrace_raw_##call *entry; \
506 struct ring_buffer *buffer; \
507 unsigned long irq_flags; \
508 int __data_size; \
509 int pc; \
510 \
511 local_save_flags(irq_flags); \
512 pc = preempt_count(); \
513 \
514 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
515 \
516 event = trace_current_buffer_lock_reserve(&buffer, \
517 event_call->event.type, \
518 sizeof(*entry) + __data_size, \
519 irq_flags, pc); \
520 if (!event) \
521 return; \
522 entry = ring_buffer_event_data(event); \
523 \
524 tstruct \
525 \
526 { assign; } \
527 \
528 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
529 trace_nowake_buffer_unlock_commit(buffer, \
530 event, irq_flags, pc); \
531 }
532 /*
533 * The ftrace_test_probe is compiled out, it is only here as a build time check
534 * to make sure that if the tracepoint handling changes, the ftrace probe will
535 * fail to compile unless it too is updated.
536 */
537
538 #undef DEFINE_EVENT
539 #define DEFINE_EVENT(template, call, proto, args) \
540 static inline void ftrace_test_probe_##call(void) \
541 { \
542 check_trace_callback_type_##call(ftrace_raw_event_##template); \
543 }
544
545 #undef DEFINE_EVENT_PRINT
546 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
547
548 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
549
550 #undef __entry
551 #define __entry REC
552
553 #undef __print_flags
554 #undef __print_symbolic
555 #undef __get_dynamic_array
556 #undef __get_str
557
558 #undef TP_printk
559 #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
560
561 #undef DECLARE_EVENT_CLASS
562 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
563 _TRACE_PERF_PROTO(call, PARAMS(proto)); \
564 static const char print_fmt_##call[] = print; \
565 static struct ftrace_event_class __used event_class_##call = { \
566 .system = __stringify(TRACE_SYSTEM), \
567 .define_fields = ftrace_define_fields_##call, \
568 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
569 .raw_init = trace_event_raw_init, \
570 .probe = ftrace_raw_event_##call, \
571 .reg = ftrace_event_reg, \
572 _TRACE_PERF_INIT(call) \
573 };
574
575 #undef DEFINE_EVENT
576 #define DEFINE_EVENT(template, call, proto, args) \
577 \
578 static struct ftrace_event_call __used \
579 __attribute__((__aligned__(4))) \
580 __attribute__((section("_ftrace_events"))) event_##call = { \
581 .name = #call, \
582 .class = &event_class_##template, \
583 .event.funcs = &ftrace_event_type_funcs_##template, \
584 .print_fmt = print_fmt_##template, \
585 };
586
587 #undef DEFINE_EVENT_PRINT
588 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
589 \
590 static const char print_fmt_##call[] = print; \
591 \
592 static struct ftrace_event_call __used \
593 __attribute__((__aligned__(4))) \
594 __attribute__((section("_ftrace_events"))) event_##call = { \
595 .name = #call, \
596 .class = &event_class_##template, \
597 .event.funcs = &ftrace_event_type_funcs_##call, \
598 .print_fmt = print_fmt_##call, \
599 }
600
601 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
602
603 /*
604 * Define the insertion callback to perf events
605 *
606 * The job is very similar to ftrace_raw_event_<call> except that we don't
607 * insert in the ring buffer but in a perf counter.
608 *
609 * static void ftrace_perf_<call>(proto)
610 * {
611 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
612 * struct ftrace_event_call *event_call = &event_<call>;
613 * extern void perf_tp_event(int, u64, u64, void *, int);
614 * struct ftrace_raw_##call *entry;
615 * struct perf_trace_buf *trace_buf;
616 * u64 __addr = 0, __count = 1;
617 * unsigned long irq_flags;
618 * struct trace_entry *ent;
619 * int __entry_size;
620 * int __data_size;
621 * int __cpu
622 * int pc;
623 *
624 * pc = preempt_count();
625 *
626 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
627 *
628 * // Below we want to get the aligned size by taking into account
629 * // the u32 field that will later store the buffer size
630 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
631 * sizeof(u64));
632 * __entry_size -= sizeof(u32);
633 *
634 * // Protect the non nmi buffer
635 * // This also protects the rcu read side
636 * local_irq_save(irq_flags);
637 * __cpu = smp_processor_id();
638 *
639 * if (in_nmi())
640 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
641 * else
642 * trace_buf = rcu_dereference_sched(perf_trace_buf);
643 *
644 * if (!trace_buf)
645 * goto end;
646 *
647 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
648 *
649 * // Avoid recursion from perf that could mess up the buffer
650 * if (trace_buf->recursion++)
651 * goto end_recursion;
652 *
653 * raw_data = trace_buf->buf;
654 *
655 * // Make recursion update visible before entering perf_tp_event
656 * // so that we protect from perf recursions.
657 *
658 * barrier();
659 *
660 * //zero dead bytes from alignment to avoid stack leak to userspace:
661 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
662 * entry = (struct ftrace_raw_<call> *)raw_data;
663 * ent = &entry->ent;
664 * tracing_generic_entry_update(ent, irq_flags, pc);
665 * ent->type = event_call->id;
666 *
667 * <tstruct> <- do some jobs with dynamic arrays
668 *
669 * <assign> <- affect our values
670 *
671 * perf_tp_event(event_call->id, __addr, __count, entry,
672 * __entry_size); <- submit them to perf counter
673 *
674 * }
675 */
676
677 #ifdef CONFIG_PERF_EVENTS
678
679 #undef __entry
680 #define __entry entry
681
682 #undef __get_dynamic_array
683 #define __get_dynamic_array(field) \
684 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
685
686 #undef __get_str
687 #define __get_str(field) (char *)__get_dynamic_array(field)
688
689 #undef __perf_addr
690 #define __perf_addr(a) __addr = (a)
691
692 #undef __perf_count
693 #define __perf_count(c) __count = (c)
694
695 #undef DECLARE_EVENT_CLASS
696 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
697 static notrace void \
698 perf_trace_##call(void *__data, proto) \
699 { \
700 struct ftrace_event_call *event_call = __data; \
701 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
702 struct ftrace_raw_##call *entry; \
703 struct pt_regs __regs; \
704 u64 __addr = 0, __count = 1; \
705 struct hlist_head *head; \
706 int __entry_size; \
707 int __data_size; \
708 int rctx; \
709 \
710 perf_fetch_caller_regs(&__regs); \
711 \
712 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
713 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
714 sizeof(u64)); \
715 __entry_size -= sizeof(u32); \
716 \
717 if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
718 "profile buffer not large enough")) \
719 return; \
720 \
721 entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
722 __entry_size, event_call->event.type, &__regs, &rctx); \
723 if (!entry) \
724 return; \
725 \
726 tstruct \
727 \
728 { assign; } \
729 \
730 head = this_cpu_ptr(event_call->perf_events); \
731 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
732 __count, &__regs, head); \
733 }
734
735 /*
736 * This part is compiled out, it is only here as a build time check
737 * to make sure that if the tracepoint handling changes, the
738 * perf probe will fail to compile unless it too is updated.
739 */
740 #undef DEFINE_EVENT
741 #define DEFINE_EVENT(template, call, proto, args) \
742 static inline void perf_test_probe_##call(void) \
743 { \
744 check_trace_callback_type_##call(perf_trace_##template); \
745 }
746
747
748 #undef DEFINE_EVENT_PRINT
749 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
750 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
751
752 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
753 #endif /* CONFIG_PERF_EVENTS */
754
755 #undef _TRACE_PROFILE_INIT
756
Linux kernel - Deliverables
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