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Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.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_FN
75 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
76 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
77
78 #undef DEFINE_EVENT_PRINT
79 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
80 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
81
82 /* Callbacks are meaningless to ftrace. */
83 #undef TRACE_EVENT_FN
84 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
85 assign, print, reg, unreg) \
86 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
87 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
88
89 #undef TRACE_EVENT_FLAGS
90 #define TRACE_EVENT_FLAGS(name, value) \
91 __TRACE_EVENT_FLAGS(name, value)
92
93 #undef TRACE_EVENT_PERF_PERM
94 #define TRACE_EVENT_PERF_PERM(name, expr...) \
95 __TRACE_EVENT_PERF_PERM(name, expr)
96
97 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
98
99
100 /*
101 * Stage 2 of the trace events.
102 *
103 * Include the following:
104 *
105 * struct ftrace_data_offsets_<call> {
106 * u32 <item1>;
107 * u32 <item2>;
108 * [...]
109 * };
110 *
111 * The __dynamic_array() macro will create each u32 <item>, this is
112 * to keep the offset of each array from the beginning of the event.
113 * The size of an array is also encoded, in the higher 16 bits of <item>.
114 */
115
116 #undef __field
117 #define __field(type, item)
118
119 #undef __field_ext
120 #define __field_ext(type, item, filter_type)
121
122 #undef __array
123 #define __array(type, item, len)
124
125 #undef __dynamic_array
126 #define __dynamic_array(type, item, len) u32 item;
127
128 #undef __string
129 #define __string(item, src) __dynamic_array(char, item, -1)
130
131 #undef DECLARE_EVENT_CLASS
132 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
133 struct ftrace_data_offsets_##call { \
134 tstruct; \
135 };
136
137 #undef DEFINE_EVENT
138 #define DEFINE_EVENT(template, name, proto, args)
139
140 #undef DEFINE_EVENT_PRINT
141 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
142 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
143
144 #undef TRACE_EVENT_FLAGS
145 #define TRACE_EVENT_FLAGS(event, flag)
146
147 #undef TRACE_EVENT_PERF_PERM
148 #define TRACE_EVENT_PERF_PERM(event, expr...)
149
150 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
151
152 /*
153 * Stage 3 of the trace events.
154 *
155 * Override the macros in <trace/trace_events.h> to include the following:
156 *
157 * enum print_line_t
158 * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
159 * {
160 * struct trace_seq *s = &iter->seq;
161 * struct ftrace_raw_<call> *field; <-- defined in stage 1
162 * struct trace_entry *entry;
163 * struct trace_seq *p = &iter->tmp_seq;
164 * int ret;
165 *
166 * entry = iter->ent;
167 *
168 * if (entry->type != event_<call>->event.type) {
169 * WARN_ON_ONCE(1);
170 * return TRACE_TYPE_UNHANDLED;
171 * }
172 *
173 * field = (typeof(field))entry;
174 *
175 * trace_seq_init(p);
176 * ret = trace_seq_printf(s, "%s: ", <call>);
177 * if (ret)
178 * ret = trace_seq_printf(s, <TP_printk> "\n");
179 * if (!ret)
180 * return TRACE_TYPE_PARTIAL_LINE;
181 *
182 * return TRACE_TYPE_HANDLED;
183 * }
184 *
185 * This is the method used to print the raw event to the trace
186 * output format. Note, this is not needed if the data is read
187 * in binary.
188 */
189
190 #undef __entry
191 #define __entry field
192
193 #undef TP_printk
194 #define TP_printk(fmt, args...) fmt "\n", args
195
196 #undef __get_dynamic_array
197 #define __get_dynamic_array(field) \
198 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
199
200 #undef __get_str
201 #define __get_str(field) (char *)__get_dynamic_array(field)
202
203 #undef __print_flags
204 #define __print_flags(flag, delim, flag_array...) \
205 ({ \
206 static const struct trace_print_flags __flags[] = \
207 { flag_array, { -1, NULL }}; \
208 ftrace_print_flags_seq(p, delim, flag, __flags); \
209 })
210
211 #undef __print_symbolic
212 #define __print_symbolic(value, symbol_array...) \
213 ({ \
214 static const struct trace_print_flags symbols[] = \
215 { symbol_array, { -1, NULL }}; \
216 ftrace_print_symbols_seq(p, value, symbols); \
217 })
218
219 #undef __print_symbolic_u64
220 #if BITS_PER_LONG == 32
221 #define __print_symbolic_u64(value, symbol_array...) \
222 ({ \
223 static const struct trace_print_flags_u64 symbols[] = \
224 { symbol_array, { -1, NULL } }; \
225 ftrace_print_symbols_seq_u64(p, value, symbols); \
226 })
227 #else
228 #define __print_symbolic_u64(value, symbol_array...) \
229 __print_symbolic(value, symbol_array)
230 #endif
231
232 #undef __print_hex
233 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
234
235 #undef DECLARE_EVENT_CLASS
236 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
237 static notrace enum print_line_t \
238 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
239 struct trace_event *trace_event) \
240 { \
241 struct trace_seq *s = &iter->seq; \
242 struct trace_seq __maybe_unused *p = &iter->tmp_seq; \
243 struct ftrace_raw_##call *field; \
244 int ret; \
245 \
246 field = (typeof(field))iter->ent; \
247 \
248 ret = ftrace_raw_output_prep(iter, trace_event); \
249 if (ret) \
250 return ret; \
251 \
252 ret = trace_seq_printf(s, print); \
253 if (!ret) \
254 return TRACE_TYPE_PARTIAL_LINE; \
255 \
256 return TRACE_TYPE_HANDLED; \
257 } \
258 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
259 .trace = ftrace_raw_output_##call, \
260 };
261
262 #undef DEFINE_EVENT_PRINT
263 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
264 static notrace enum print_line_t \
265 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
266 struct trace_event *event) \
267 { \
268 struct trace_seq *s = &iter->seq; \
269 struct ftrace_raw_##template *field; \
270 struct trace_entry *entry; \
271 struct trace_seq *p = &iter->tmp_seq; \
272 int ret; \
273 \
274 entry = iter->ent; \
275 \
276 if (entry->type != event_##call.event.type) { \
277 WARN_ON_ONCE(1); \
278 return TRACE_TYPE_UNHANDLED; \
279 } \
280 \
281 field = (typeof(field))entry; \
282 \
283 trace_seq_init(p); \
284 ret = trace_seq_printf(s, "%s: ", #call); \
285 if (ret) \
286 ret = trace_seq_printf(s, print); \
287 if (!ret) \
288 return TRACE_TYPE_PARTIAL_LINE; \
289 \
290 return TRACE_TYPE_HANDLED; \
291 } \
292 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
293 .trace = ftrace_raw_output_##call, \
294 };
295
296 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
297
298 #undef __field_ext
299 #define __field_ext(type, item, filter_type) \
300 ret = trace_define_field(event_call, #type, #item, \
301 offsetof(typeof(field), item), \
302 sizeof(field.item), \
303 is_signed_type(type), filter_type); \
304 if (ret) \
305 return ret;
306
307 #undef __field
308 #define __field(type, item) __field_ext(type, item, FILTER_OTHER)
309
310 #undef __array
311 #define __array(type, item, len) \
312 do { \
313 char *type_str = #type"["__stringify(len)"]"; \
314 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
315 ret = trace_define_field(event_call, type_str, #item, \
316 offsetof(typeof(field), item), \
317 sizeof(field.item), \
318 is_signed_type(type), FILTER_OTHER); \
319 if (ret) \
320 return ret; \
321 } while (0);
322
323 #undef __dynamic_array
324 #define __dynamic_array(type, item, len) \
325 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
326 offsetof(typeof(field), __data_loc_##item), \
327 sizeof(field.__data_loc_##item), \
328 is_signed_type(type), FILTER_OTHER);
329
330 #undef __string
331 #define __string(item, src) __dynamic_array(char, item, -1)
332
333 #undef DECLARE_EVENT_CLASS
334 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
335 static int notrace __init \
336 ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
337 { \
338 struct ftrace_raw_##call field; \
339 int ret; \
340 \
341 tstruct; \
342 \
343 return ret; \
344 }
345
346 #undef DEFINE_EVENT
347 #define DEFINE_EVENT(template, name, proto, args)
348
349 #undef DEFINE_EVENT_PRINT
350 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
351 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
352
353 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
354
355 /*
356 * remember the offset of each array from the beginning of the event.
357 */
358
359 #undef __entry
360 #define __entry entry
361
362 #undef __field
363 #define __field(type, item)
364
365 #undef __field_ext
366 #define __field_ext(type, item, filter_type)
367
368 #undef __array
369 #define __array(type, item, len)
370
371 #undef __dynamic_array
372 #define __dynamic_array(type, item, len) \
373 __data_offsets->item = __data_size + \
374 offsetof(typeof(*entry), __data); \
375 __data_offsets->item |= (len * sizeof(type)) << 16; \
376 __data_size += (len) * sizeof(type);
377
378 #undef __string
379 #define __string(item, src) __dynamic_array(char, item, \
380 strlen((src) ? (const char *)(src) : "(null)") + 1)
381
382 #undef DECLARE_EVENT_CLASS
383 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
384 static inline notrace int ftrace_get_offsets_##call( \
385 struct ftrace_data_offsets_##call *__data_offsets, proto) \
386 { \
387 int __data_size = 0; \
388 struct ftrace_raw_##call __maybe_unused *entry; \
389 \
390 tstruct; \
391 \
392 return __data_size; \
393 }
394
395 #undef DEFINE_EVENT
396 #define DEFINE_EVENT(template, name, proto, args)
397
398 #undef DEFINE_EVENT_PRINT
399 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
400 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
401
402 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
403
404 /*
405 * Stage 4 of the trace events.
406 *
407 * Override the macros in <trace/trace_events.h> to include the following:
408 *
409 * For those macros defined with TRACE_EVENT:
410 *
411 * static struct ftrace_event_call event_<call>;
412 *
413 * static void ftrace_raw_event_<call>(void *__data, proto)
414 * {
415 * struct ftrace_event_file *ftrace_file = __data;
416 * struct ftrace_event_call *event_call = ftrace_file->event_call;
417 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
418 * unsigned long eflags = ftrace_file->flags;
419 * enum event_trigger_type __tt = ETT_NONE;
420 * struct ring_buffer_event *event;
421 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
422 * struct ring_buffer *buffer;
423 * unsigned long irq_flags;
424 * int __data_size;
425 * int pc;
426 *
427 * if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
428 * if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
429 * event_triggers_call(ftrace_file, NULL);
430 * if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
431 * return;
432 * }
433 *
434 * local_save_flags(irq_flags);
435 * pc = preempt_count();
436 *
437 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
438 *
439 * event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
440 * event_<call>->event.type,
441 * sizeof(*entry) + __data_size,
442 * irq_flags, pc);
443 * if (!event)
444 * return;
445 * entry = ring_buffer_event_data(event);
446 *
447 * { <assign>; } <-- Here we assign the entries by the __field and
448 * __array macros.
449 *
450 * if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
451 * __tt = event_triggers_call(ftrace_file, entry);
452 *
453 * if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
454 * &ftrace_file->flags))
455 * ring_buffer_discard_commit(buffer, event);
456 * else if (!filter_check_discard(ftrace_file, entry, buffer, event))
457 * trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
458 *
459 * if (__tt)
460 * event_triggers_post_call(ftrace_file, __tt);
461 * }
462 *
463 * static struct trace_event ftrace_event_type_<call> = {
464 * .trace = ftrace_raw_output_<call>, <-- stage 2
465 * };
466 *
467 * static const char print_fmt_<call>[] = <TP_printk>;
468 *
469 * static struct ftrace_event_class __used event_class_<template> = {
470 * .system = "<system>",
471 * .define_fields = ftrace_define_fields_<call>,
472 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
473 * .raw_init = trace_event_raw_init,
474 * .probe = ftrace_raw_event_##call,
475 * .reg = ftrace_event_reg,
476 * };
477 *
478 * static struct ftrace_event_call event_<call> = {
479 * .name = "<call>",
480 * .class = event_class_<template>,
481 * .event = &ftrace_event_type_<call>,
482 * .print_fmt = print_fmt_<call>,
483 * };
484 * // its only safe to use pointers when doing linker tricks to
485 * // create an array.
486 * static struct ftrace_event_call __used
487 * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
488 *
489 */
490
491 #ifdef CONFIG_PERF_EVENTS
492
493 #define _TRACE_PERF_PROTO(call, proto) \
494 static notrace void \
495 perf_trace_##call(void *__data, proto);
496
497 #define _TRACE_PERF_INIT(call) \
498 .perf_probe = perf_trace_##call,
499
500 #else
501 #define _TRACE_PERF_PROTO(call, proto)
502 #define _TRACE_PERF_INIT(call)
503 #endif /* CONFIG_PERF_EVENTS */
504
505 #undef __entry
506 #define __entry entry
507
508 #undef __field
509 #define __field(type, item)
510
511 #undef __array
512 #define __array(type, item, len)
513
514 #undef __dynamic_array
515 #define __dynamic_array(type, item, len) \
516 __entry->__data_loc_##item = __data_offsets.item;
517
518 #undef __string
519 #define __string(item, src) __dynamic_array(char, item, -1) \
520
521 #undef __assign_str
522 #define __assign_str(dst, src) \
523 strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
524
525 #undef TP_fast_assign
526 #define TP_fast_assign(args...) args
527
528 #undef __perf_addr
529 #define __perf_addr(a) (a)
530
531 #undef __perf_count
532 #define __perf_count(c) (c)
533
534 #undef __perf_task
535 #define __perf_task(t) (t)
536
537 #undef DECLARE_EVENT_CLASS
538 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
539 \
540 static notrace void \
541 ftrace_raw_event_##call(void *__data, proto) \
542 { \
543 struct ftrace_event_file *ftrace_file = __data; \
544 struct ftrace_event_call *event_call = ftrace_file->event_call; \
545 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
546 struct ring_buffer_event *event; \
547 struct ftrace_raw_##call *entry; \
548 struct ring_buffer *buffer; \
549 unsigned long irq_flags; \
550 int __data_size; \
551 int pc; \
552 \
553 if (ftrace_trigger_soft_disabled(ftrace_file)) \
554 return; \
555 \
556 local_save_flags(irq_flags); \
557 pc = preempt_count(); \
558 \
559 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
560 \
561 event = trace_event_buffer_lock_reserve(&buffer, ftrace_file, \
562 event_call->event.type, \
563 sizeof(*entry) + __data_size, \
564 irq_flags, pc); \
565 if (!event) \
566 return; \
567 entry = ring_buffer_event_data(event); \
568 \
569 tstruct \
570 \
571 { assign; } \
572 \
573 event_trigger_unlock_commit(ftrace_file, buffer, event, entry, \
574 irq_flags, pc); \
575 }
576 /*
577 * The ftrace_test_probe is compiled out, it is only here as a build time check
578 * to make sure that if the tracepoint handling changes, the ftrace probe will
579 * fail to compile unless it too is updated.
580 */
581
582 #undef DEFINE_EVENT
583 #define DEFINE_EVENT(template, call, proto, args) \
584 static inline void ftrace_test_probe_##call(void) \
585 { \
586 check_trace_callback_type_##call(ftrace_raw_event_##template); \
587 }
588
589 #undef DEFINE_EVENT_PRINT
590 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
591
592 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
593
594 #undef __entry
595 #define __entry REC
596
597 #undef __print_flags
598 #undef __print_symbolic
599 #undef __print_hex
600 #undef __get_dynamic_array
601 #undef __get_str
602
603 #undef TP_printk
604 #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
605
606 #undef DECLARE_EVENT_CLASS
607 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
608 _TRACE_PERF_PROTO(call, PARAMS(proto)); \
609 static const char print_fmt_##call[] = print; \
610 static struct ftrace_event_class __used __refdata event_class_##call = { \
611 .system = __stringify(TRACE_SYSTEM), \
612 .define_fields = ftrace_define_fields_##call, \
613 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
614 .raw_init = trace_event_raw_init, \
615 .probe = ftrace_raw_event_##call, \
616 .reg = ftrace_event_reg, \
617 _TRACE_PERF_INIT(call) \
618 };
619
620 #undef DEFINE_EVENT
621 #define DEFINE_EVENT(template, call, proto, args) \
622 \
623 static struct ftrace_event_call __used event_##call = { \
624 .name = #call, \
625 .class = &event_class_##template, \
626 .event.funcs = &ftrace_event_type_funcs_##template, \
627 .print_fmt = print_fmt_##template, \
628 }; \
629 static struct ftrace_event_call __used \
630 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
631
632 #undef DEFINE_EVENT_PRINT
633 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
634 \
635 static const char print_fmt_##call[] = print; \
636 \
637 static struct ftrace_event_call __used event_##call = { \
638 .name = #call, \
639 .class = &event_class_##template, \
640 .event.funcs = &ftrace_event_type_funcs_##call, \
641 .print_fmt = print_fmt_##call, \
642 }; \
643 static struct ftrace_event_call __used \
644 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
645
646 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
647
648
649 #ifdef CONFIG_PERF_EVENTS
650
651 #undef __entry
652 #define __entry entry
653
654 #undef __get_dynamic_array
655 #define __get_dynamic_array(field) \
656 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
657
658 #undef __get_str
659 #define __get_str(field) (char *)__get_dynamic_array(field)
660
661 #undef __perf_addr
662 #define __perf_addr(a) (__addr = (a))
663
664 #undef __perf_count
665 #define __perf_count(c) (__count = (c))
666
667 #undef __perf_task
668 #define __perf_task(t) (__task = (t))
669
670 #undef DECLARE_EVENT_CLASS
671 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
672 static notrace void \
673 perf_trace_##call(void *__data, proto) \
674 { \
675 struct ftrace_event_call *event_call = __data; \
676 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
677 struct ftrace_raw_##call *entry; \
678 struct pt_regs __regs; \
679 u64 __addr = 0, __count = 1; \
680 struct task_struct *__task = NULL; \
681 struct hlist_head *head; \
682 int __entry_size; \
683 int __data_size; \
684 int rctx; \
685 \
686 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
687 \
688 head = this_cpu_ptr(event_call->perf_events); \
689 if (__builtin_constant_p(!__task) && !__task && \
690 hlist_empty(head)) \
691 return; \
692 \
693 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
694 sizeof(u64)); \
695 __entry_size -= sizeof(u32); \
696 \
697 perf_fetch_caller_regs(&__regs); \
698 entry = perf_trace_buf_prepare(__entry_size, \
699 event_call->event.type, &__regs, &rctx); \
700 if (!entry) \
701 return; \
702 \
703 tstruct \
704 \
705 { assign; } \
706 \
707 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
708 __count, &__regs, head, __task); \
709 }
710
711 /*
712 * This part is compiled out, it is only here as a build time check
713 * to make sure that if the tracepoint handling changes, the
714 * perf probe will fail to compile unless it too is updated.
715 */
716 #undef DEFINE_EVENT
717 #define DEFINE_EVENT(template, call, proto, args) \
718 static inline void perf_test_probe_##call(void) \
719 { \
720 check_trace_callback_type_##call(perf_trace_##template); \
721 }
722
723
724 #undef DEFINE_EVENT_PRINT
725 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
726 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
727
728 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
729 #endif /* CONFIG_PERF_EVENTS */
730
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