1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Stage 1 of the trace events.
4  *
5  * Override the macros in <trace/trace_events.h> to include the following:
6  *
7  * struct trace_event_raw_<call> {
8  *	struct trace_entry		ent;
9  *	<type>				<item>;
10  *	<type2>				<item2>[<len>];
11  *	[...]
12  * };
13  *
14  * The <type> <item> is created by the __field(type, item) macro or
15  * the __array(type2, item2, len) macro.
16  * We simply do "type item;", and that will create the fields
17  * in the structure.
18  */
19 
20 #include <linux/trace_events.h>
21 
22 #ifndef TRACE_SYSTEM_VAR
23 #define TRACE_SYSTEM_VAR TRACE_SYSTEM
24 #endif
25 
26 #define __app__(x, y) str__##x##y
27 #define __app(x, y) __app__(x, y)
28 
29 #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
30 
31 #define TRACE_MAKE_SYSTEM_STR()				\
32 	static const char TRACE_SYSTEM_STRING[] =	\
33 		__stringify(TRACE_SYSTEM)
34 
35 TRACE_MAKE_SYSTEM_STR();
36 
37 #undef TRACE_DEFINE_ENUM
38 #define TRACE_DEFINE_ENUM(a)				\
39 	static struct trace_eval_map __used __initdata	\
40 	__##TRACE_SYSTEM##_##a =			\
41 	{						\
42 		.system = TRACE_SYSTEM_STRING,		\
43 		.eval_string = #a,			\
44 		.eval_value = a				\
45 	};						\
46 	static struct trace_eval_map __used		\
47 	__attribute__((section("_ftrace_eval_map")))	\
48 	*TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
49 
50 #undef TRACE_DEFINE_SIZEOF
51 #define TRACE_DEFINE_SIZEOF(a)				\
52 	static struct trace_eval_map __used __initdata	\
53 	__##TRACE_SYSTEM##_##a =			\
54 	{						\
55 		.system = TRACE_SYSTEM_STRING,		\
56 		.eval_string = "sizeof(" #a ")",	\
57 		.eval_value = sizeof(a)			\
58 	};						\
59 	static struct trace_eval_map __used		\
60 	__attribute__((section("_ftrace_eval_map")))	\
61 	*TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
62 
63 /*
64  * DECLARE_EVENT_CLASS can be used to add a generic function
65  * handlers for events. That is, if all events have the same
66  * parameters and just have distinct trace points.
67  * Each tracepoint can be defined with DEFINE_EVENT and that
68  * will map the DECLARE_EVENT_CLASS to the tracepoint.
69  *
70  * TRACE_EVENT is a one to one mapping between tracepoint and template.
71  */
72 #undef TRACE_EVENT
73 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
74 	DECLARE_EVENT_CLASS(name,			       \
75 			     PARAMS(proto),		       \
76 			     PARAMS(args),		       \
77 			     PARAMS(tstruct),		       \
78 			     PARAMS(assign),		       \
79 			     PARAMS(print));		       \
80 	DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
81 
82 
83 #undef __field
84 #define __field(type, item)		type	item;
85 
86 #undef __field_ext
87 #define __field_ext(type, item, filter_type)	type	item;
88 
89 #undef __field_struct
90 #define __field_struct(type, item)	type	item;
91 
92 #undef __field_struct_ext
93 #define __field_struct_ext(type, item, filter_type)	type	item;
94 
95 #undef __array
96 #define __array(type, item, len)	type	item[len];
97 
98 #undef __dynamic_array
99 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
100 
101 #undef __string
102 #define __string(item, src) __dynamic_array(char, item, -1)
103 
104 #undef __bitmask
105 #define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
106 
107 #undef TP_STRUCT__entry
108 #define TP_STRUCT__entry(args...) args
109 
110 #undef DECLARE_EVENT_CLASS
111 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)	\
112 	struct trace_event_raw_##name {					\
113 		struct trace_entry	ent;				\
114 		tstruct							\
115 		char			__data[0];			\
116 	};								\
117 									\
118 	static struct trace_event_class event_class_##name;
119 
120 #undef DEFINE_EVENT
121 #define DEFINE_EVENT(template, name, proto, args)	\
122 	static struct trace_event_call	__used		\
123 	__attribute__((__aligned__(4))) event_##name
124 
125 #undef DEFINE_EVENT_FN
126 #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)	\
127 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
128 
129 #undef DEFINE_EVENT_PRINT
130 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
131 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
132 
133 /* Callbacks are meaningless to ftrace. */
134 #undef TRACE_EVENT_FN
135 #define TRACE_EVENT_FN(name, proto, args, tstruct,			\
136 		assign, print, reg, unreg)				\
137 	TRACE_EVENT(name, PARAMS(proto), PARAMS(args),			\
138 		PARAMS(tstruct), PARAMS(assign), PARAMS(print))		\
139 
140 #undef TRACE_EVENT_FN_COND
141 #define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct,	\
142 		assign, print, reg, unreg)				\
143 	TRACE_EVENT_CONDITION(name, PARAMS(proto), PARAMS(args), PARAMS(cond),		\
144 		PARAMS(tstruct), PARAMS(assign), PARAMS(print))		\
145 
146 #undef TRACE_EVENT_FLAGS
147 #define TRACE_EVENT_FLAGS(name, value)					\
148 	__TRACE_EVENT_FLAGS(name, value)
149 
150 #undef TRACE_EVENT_PERF_PERM
151 #define TRACE_EVENT_PERF_PERM(name, expr...)				\
152 	__TRACE_EVENT_PERF_PERM(name, expr)
153 
154 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
155 
156 /*
157  * Stage 2 of the trace events.
158  *
159  * Include the following:
160  *
161  * struct trace_event_data_offsets_<call> {
162  *	u32				<item1>;
163  *	u32				<item2>;
164  *	[...]
165  * };
166  *
167  * The __dynamic_array() macro will create each u32 <item>, this is
168  * to keep the offset of each array from the beginning of the event.
169  * The size of an array is also encoded, in the higher 16 bits of <item>.
170  */
171 
172 #undef TRACE_DEFINE_ENUM
173 #define TRACE_DEFINE_ENUM(a)
174 
175 #undef TRACE_DEFINE_SIZEOF
176 #define TRACE_DEFINE_SIZEOF(a)
177 
178 #undef __field
179 #define __field(type, item)
180 
181 #undef __field_ext
182 #define __field_ext(type, item, filter_type)
183 
184 #undef __field_struct
185 #define __field_struct(type, item)
186 
187 #undef __field_struct_ext
188 #define __field_struct_ext(type, item, filter_type)
189 
190 #undef __array
191 #define __array(type, item, len)
192 
193 #undef __dynamic_array
194 #define __dynamic_array(type, item, len)	u32 item;
195 
196 #undef __string
197 #define __string(item, src) __dynamic_array(char, item, -1)
198 
199 #undef __bitmask
200 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
201 
202 #undef DECLARE_EVENT_CLASS
203 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
204 	struct trace_event_data_offsets_##call {			\
205 		tstruct;						\
206 	};
207 
208 #undef DEFINE_EVENT
209 #define DEFINE_EVENT(template, name, proto, args)
210 
211 #undef DEFINE_EVENT_PRINT
212 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
213 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
214 
215 #undef TRACE_EVENT_FLAGS
216 #define TRACE_EVENT_FLAGS(event, flag)
217 
218 #undef TRACE_EVENT_PERF_PERM
219 #define TRACE_EVENT_PERF_PERM(event, expr...)
220 
221 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
222 
223 /*
224  * Stage 3 of the trace events.
225  *
226  * Override the macros in <trace/trace_events.h> to include the following:
227  *
228  * enum print_line_t
229  * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
230  * {
231  *	struct trace_seq *s = &iter->seq;
232  *	struct trace_event_raw_<call> *field; <-- defined in stage 1
233  *	struct trace_entry *entry;
234  *	struct trace_seq *p = &iter->tmp_seq;
235  *	int ret;
236  *
237  *	entry = iter->ent;
238  *
239  *	if (entry->type != event_<call>->event.type) {
240  *		WARN_ON_ONCE(1);
241  *		return TRACE_TYPE_UNHANDLED;
242  *	}
243  *
244  *	field = (typeof(field))entry;
245  *
246  *	trace_seq_init(p);
247  *	ret = trace_seq_printf(s, "%s: ", <call>);
248  *	if (ret)
249  *		ret = trace_seq_printf(s, <TP_printk> "\n");
250  *	if (!ret)
251  *		return TRACE_TYPE_PARTIAL_LINE;
252  *
253  *	return TRACE_TYPE_HANDLED;
254  * }
255  *
256  * This is the method used to print the raw event to the trace
257  * output format. Note, this is not needed if the data is read
258  * in binary.
259  */
260 
261 #undef __entry
262 #define __entry field
263 
264 #undef TP_printk
265 #define TP_printk(fmt, args...) fmt "\n", args
266 
267 #undef __get_dynamic_array
268 #define __get_dynamic_array(field)	\
269 		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
270 
271 #undef __get_dynamic_array_len
272 #define __get_dynamic_array_len(field)	\
273 		((__entry->__data_loc_##field >> 16) & 0xffff)
274 
275 #undef __get_str
276 #define __get_str(field) ((char *)__get_dynamic_array(field))
277 
278 #undef __get_bitmask
279 #define __get_bitmask(field)						\
280 	({								\
281 		void *__bitmask = __get_dynamic_array(field);		\
282 		unsigned int __bitmask_size;				\
283 		__bitmask_size = __get_dynamic_array_len(field);	\
284 		trace_print_bitmask_seq(p, __bitmask, __bitmask_size);	\
285 	})
286 
287 #undef __print_flags
288 #define __print_flags(flag, delim, flag_array...)			\
289 	({								\
290 		static const struct trace_print_flags __flags[] =	\
291 			{ flag_array, { -1, NULL }};			\
292 		trace_print_flags_seq(p, delim, flag, __flags);	\
293 	})
294 
295 #undef __print_symbolic
296 #define __print_symbolic(value, symbol_array...)			\
297 	({								\
298 		static const struct trace_print_flags symbols[] =	\
299 			{ symbol_array, { -1, NULL }};			\
300 		trace_print_symbols_seq(p, value, symbols);		\
301 	})
302 
303 #undef __print_flags_u64
304 #undef __print_symbolic_u64
305 #if BITS_PER_LONG == 32
306 #define __print_flags_u64(flag, delim, flag_array...)			\
307 	({								\
308 		static const struct trace_print_flags_u64 __flags[] =	\
309 			{ flag_array, { -1, NULL } };			\
310 		trace_print_flags_seq_u64(p, delim, flag, __flags);	\
311 	})
312 
313 #define __print_symbolic_u64(value, symbol_array...)			\
314 	({								\
315 		static const struct trace_print_flags_u64 symbols[] =	\
316 			{ symbol_array, { -1, NULL } };			\
317 		trace_print_symbols_seq_u64(p, value, symbols);	\
318 	})
319 #else
320 #define __print_flags_u64(flag, delim, flag_array...)			\
321 			__print_flags(flag, delim, flag_array)
322 
323 #define __print_symbolic_u64(value, symbol_array...)			\
324 			__print_symbolic(value, symbol_array)
325 #endif
326 
327 #undef __print_hex
328 #define __print_hex(buf, buf_len)					\
329 	trace_print_hex_seq(p, buf, buf_len, false)
330 
331 #undef __print_hex_str
332 #define __print_hex_str(buf, buf_len)					\
333 	trace_print_hex_seq(p, buf, buf_len, true)
334 
335 #undef __print_array
336 #define __print_array(array, count, el_size)				\
337 	({								\
338 		BUILD_BUG_ON(el_size != 1 && el_size != 2 &&		\
339 			     el_size != 4 && el_size != 8);		\
340 		trace_print_array_seq(p, array, count, el_size);	\
341 	})
342 
343 #undef DECLARE_EVENT_CLASS
344 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
345 static notrace enum print_line_t					\
346 trace_raw_output_##call(struct trace_iterator *iter, int flags,		\
347 			struct trace_event *trace_event)		\
348 {									\
349 	struct trace_seq *s = &iter->seq;				\
350 	struct trace_seq __maybe_unused *p = &iter->tmp_seq;		\
351 	struct trace_event_raw_##call *field;				\
352 	int ret;							\
353 									\
354 	field = (typeof(field))iter->ent;				\
355 									\
356 	ret = trace_raw_output_prep(iter, trace_event);			\
357 	if (ret != TRACE_TYPE_HANDLED)					\
358 		return ret;						\
359 									\
360 	trace_seq_printf(s, print);					\
361 									\
362 	return trace_handle_return(s);					\
363 }									\
364 static struct trace_event_functions trace_event_type_funcs_##call = {	\
365 	.trace			= trace_raw_output_##call,		\
366 };
367 
368 #undef DEFINE_EVENT_PRINT
369 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
370 static notrace enum print_line_t					\
371 trace_raw_output_##call(struct trace_iterator *iter, int flags,		\
372 			 struct trace_event *event)			\
373 {									\
374 	struct trace_event_raw_##template *field;			\
375 	struct trace_entry *entry;					\
376 	struct trace_seq *p = &iter->tmp_seq;				\
377 									\
378 	entry = iter->ent;						\
379 									\
380 	if (entry->type != event_##call.event.type) {			\
381 		WARN_ON_ONCE(1);					\
382 		return TRACE_TYPE_UNHANDLED;				\
383 	}								\
384 									\
385 	field = (typeof(field))entry;					\
386 									\
387 	trace_seq_init(p);						\
388 	return trace_output_call(iter, #call, print);			\
389 }									\
390 static struct trace_event_functions trace_event_type_funcs_##call = {	\
391 	.trace			= trace_raw_output_##call,		\
392 };
393 
394 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
395 
396 #undef __field_ext
397 #define __field_ext(type, item, filter_type)				\
398 	ret = trace_define_field(event_call, #type, #item,		\
399 				 offsetof(typeof(field), item),		\
400 				 sizeof(field.item),			\
401 				 is_signed_type(type), filter_type);	\
402 	if (ret)							\
403 		return ret;
404 
405 #undef __field_struct_ext
406 #define __field_struct_ext(type, item, filter_type)			\
407 	ret = trace_define_field(event_call, #type, #item,		\
408 				 offsetof(typeof(field), item),		\
409 				 sizeof(field.item),			\
410 				 0, filter_type);			\
411 	if (ret)							\
412 		return ret;
413 
414 #undef __field
415 #define __field(type, item)	__field_ext(type, item, FILTER_OTHER)
416 
417 #undef __field_struct
418 #define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
419 
420 #undef __array
421 #define __array(type, item, len)					\
422 	do {								\
423 		char *type_str = #type"["__stringify(len)"]";		\
424 		BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);			\
425 		BUILD_BUG_ON(len <= 0);					\
426 		ret = trace_define_field(event_call, type_str, #item,	\
427 				 offsetof(typeof(field), item),		\
428 				 sizeof(field.item),			\
429 				 is_signed_type(type), FILTER_OTHER);	\
430 		if (ret)						\
431 			return ret;					\
432 	} while (0);
433 
434 #undef __dynamic_array
435 #define __dynamic_array(type, item, len)				       \
436 	ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
437 				 offsetof(typeof(field), __data_loc_##item),   \
438 				 sizeof(field.__data_loc_##item),	       \
439 				 is_signed_type(type), FILTER_OTHER);
440 
441 #undef __string
442 #define __string(item, src) __dynamic_array(char, item, -1)
443 
444 #undef __bitmask
445 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
446 
447 #undef DECLARE_EVENT_CLASS
448 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print)	\
449 static int notrace __init						\
450 trace_event_define_fields_##call(struct trace_event_call *event_call)	\
451 {									\
452 	struct trace_event_raw_##call field;				\
453 	int ret;							\
454 									\
455 	tstruct;							\
456 									\
457 	return ret;							\
458 }
459 
460 #undef DEFINE_EVENT
461 #define DEFINE_EVENT(template, name, proto, args)
462 
463 #undef DEFINE_EVENT_PRINT
464 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
465 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
466 
467 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
468 
469 /*
470  * remember the offset of each array from the beginning of the event.
471  */
472 
473 #undef __entry
474 #define __entry entry
475 
476 #undef __field
477 #define __field(type, item)
478 
479 #undef __field_ext
480 #define __field_ext(type, item, filter_type)
481 
482 #undef __field_struct
483 #define __field_struct(type, item)
484 
485 #undef __field_struct_ext
486 #define __field_struct_ext(type, item, filter_type)
487 
488 #undef __array
489 #define __array(type, item, len)
490 
491 #undef __dynamic_array
492 #define __dynamic_array(type, item, len)				\
493 	__item_length = (len) * sizeof(type);				\
494 	__data_offsets->item = __data_size +				\
495 			       offsetof(typeof(*entry), __data);	\
496 	__data_offsets->item |= __item_length << 16;			\
497 	__data_size += __item_length;
498 
499 #undef __string
500 #define __string(item, src) __dynamic_array(char, item,			\
501 		    strlen((src) ? (const char *)(src) : "(null)") + 1)
502 
503 /*
504  * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
505  * num_possible_cpus().
506  */
507 #define __bitmask_size_in_bytes_raw(nr_bits)	\
508 	(((nr_bits) + 7) / 8)
509 
510 #define __bitmask_size_in_longs(nr_bits)			\
511 	((__bitmask_size_in_bytes_raw(nr_bits) +		\
512 	  ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
513 
514 /*
515  * __bitmask_size_in_bytes is the number of bytes needed to hold
516  * num_possible_cpus() padded out to the nearest long. This is what
517  * is saved in the buffer, just to be consistent.
518  */
519 #define __bitmask_size_in_bytes(nr_bits)				\
520 	(__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
521 
522 #undef __bitmask
523 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item,	\
524 					 __bitmask_size_in_longs(nr_bits))
525 
526 #undef DECLARE_EVENT_CLASS
527 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
528 static inline notrace int trace_event_get_offsets_##call(		\
529 	struct trace_event_data_offsets_##call *__data_offsets, proto)	\
530 {									\
531 	int __data_size = 0;						\
532 	int __maybe_unused __item_length;				\
533 	struct trace_event_raw_##call __maybe_unused *entry;		\
534 									\
535 	tstruct;							\
536 									\
537 	return __data_size;						\
538 }
539 
540 #undef DEFINE_EVENT
541 #define DEFINE_EVENT(template, name, proto, args)
542 
543 #undef DEFINE_EVENT_PRINT
544 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
545 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
546 
547 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
548 
549 /*
550  * Stage 4 of the trace events.
551  *
552  * Override the macros in <trace/trace_events.h> to include the following:
553  *
554  * For those macros defined with TRACE_EVENT:
555  *
556  * static struct trace_event_call event_<call>;
557  *
558  * static void trace_event_raw_event_<call>(void *__data, proto)
559  * {
560  *	struct trace_event_file *trace_file = __data;
561  *	struct trace_event_call *event_call = trace_file->event_call;
562  *	struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
563  *	unsigned long eflags = trace_file->flags;
564  *	enum event_trigger_type __tt = ETT_NONE;
565  *	struct ring_buffer_event *event;
566  *	struct trace_event_raw_<call> *entry; <-- defined in stage 1
567  *	struct ring_buffer *buffer;
568  *	unsigned long irq_flags;
569  *	int __data_size;
570  *	int pc;
571  *
572  *	if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
573  *		if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
574  *			event_triggers_call(trace_file, NULL);
575  *		if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
576  *			return;
577  *	}
578  *
579  *	local_save_flags(irq_flags);
580  *	pc = preempt_count();
581  *
582  *	__data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
583  *
584  *	event = trace_event_buffer_lock_reserve(&buffer, trace_file,
585  *				  event_<call>->event.type,
586  *				  sizeof(*entry) + __data_size,
587  *				  irq_flags, pc);
588  *	if (!event)
589  *		return;
590  *	entry	= ring_buffer_event_data(event);
591  *
592  *	{ <assign>; }  <-- Here we assign the entries by the __field and
593  *			   __array macros.
594  *
595  *	if (eflags & EVENT_FILE_FL_TRIGGER_COND)
596  *		__tt = event_triggers_call(trace_file, entry);
597  *
598  *	if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
599  *		     &trace_file->flags))
600  *		ring_buffer_discard_commit(buffer, event);
601  *	else if (!filter_check_discard(trace_file, entry, buffer, event))
602  *		trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
603  *
604  *	if (__tt)
605  *		event_triggers_post_call(trace_file, __tt);
606  * }
607  *
608  * static struct trace_event ftrace_event_type_<call> = {
609  *	.trace			= trace_raw_output_<call>, <-- stage 2
610  * };
611  *
612  * static char print_fmt_<call>[] = <TP_printk>;
613  *
614  * static struct trace_event_class __used event_class_<template> = {
615  *	.system			= "<system>",
616  *	.define_fields		= trace_event_define_fields_<call>,
617  *	.fields			= LIST_HEAD_INIT(event_class_##call.fields),
618  *	.raw_init		= trace_event_raw_init,
619  *	.probe			= trace_event_raw_event_##call,
620  *	.reg			= trace_event_reg,
621  * };
622  *
623  * static struct trace_event_call event_<call> = {
624  *	.class			= event_class_<template>,
625  *	{
626  *		.tp			= &__tracepoint_<call>,
627  *	},
628  *	.event			= &ftrace_event_type_<call>,
629  *	.print_fmt		= print_fmt_<call>,
630  *	.flags			= TRACE_EVENT_FL_TRACEPOINT,
631  * };
632  * // its only safe to use pointers when doing linker tricks to
633  * // create an array.
634  * static struct trace_event_call __used
635  * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
636  *
637  */
638 
639 #ifdef CONFIG_PERF_EVENTS
640 
641 #define _TRACE_PERF_PROTO(call, proto)					\
642 	static notrace void						\
643 	perf_trace_##call(void *__data, proto);
644 
645 #define _TRACE_PERF_INIT(call)						\
646 	.perf_probe		= perf_trace_##call,
647 
648 #else
649 #define _TRACE_PERF_PROTO(call, proto)
650 #define _TRACE_PERF_INIT(call)
651 #endif /* CONFIG_PERF_EVENTS */
652 
653 #undef __entry
654 #define __entry entry
655 
656 #undef __field
657 #define __field(type, item)
658 
659 #undef __field_struct
660 #define __field_struct(type, item)
661 
662 #undef __array
663 #define __array(type, item, len)
664 
665 #undef __dynamic_array
666 #define __dynamic_array(type, item, len)				\
667 	__entry->__data_loc_##item = __data_offsets.item;
668 
669 #undef __string
670 #define __string(item, src) __dynamic_array(char, item, -1)
671 
672 #undef __assign_str
673 #define __assign_str(dst, src)						\
674 	strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
675 
676 #undef __bitmask
677 #define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
678 
679 #undef __get_bitmask
680 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
681 
682 #undef __assign_bitmask
683 #define __assign_bitmask(dst, src, nr_bits)					\
684 	memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
685 
686 #undef TP_fast_assign
687 #define TP_fast_assign(args...) args
688 
689 #undef __perf_count
690 #define __perf_count(c)	(c)
691 
692 #undef __perf_task
693 #define __perf_task(t)	(t)
694 
695 #undef DECLARE_EVENT_CLASS
696 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
697 									\
698 static notrace void							\
699 trace_event_raw_event_##call(void *__data, proto)			\
700 {									\
701 	struct trace_event_file *trace_file = __data;			\
702 	struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
703 	struct trace_event_buffer fbuffer;				\
704 	struct trace_event_raw_##call *entry;				\
705 	int __data_size;						\
706 									\
707 	if (trace_trigger_soft_disabled(trace_file))			\
708 		return;							\
709 									\
710 	__data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
711 									\
712 	entry = trace_event_buffer_reserve(&fbuffer, trace_file,	\
713 				 sizeof(*entry) + __data_size);		\
714 									\
715 	if (!entry)							\
716 		return;							\
717 									\
718 	tstruct								\
719 									\
720 	{ assign; }							\
721 									\
722 	trace_event_buffer_commit(&fbuffer);				\
723 }
724 /*
725  * The ftrace_test_probe is compiled out, it is only here as a build time check
726  * to make sure that if the tracepoint handling changes, the ftrace probe will
727  * fail to compile unless it too is updated.
728  */
729 
730 #undef DEFINE_EVENT
731 #define DEFINE_EVENT(template, call, proto, args)			\
732 static inline void ftrace_test_probe_##call(void)			\
733 {									\
734 	check_trace_callback_type_##call(trace_event_raw_event_##template); \
735 }
736 
737 #undef DEFINE_EVENT_PRINT
738 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
739 
740 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
741 
742 #undef __entry
743 #define __entry REC
744 
745 #undef __print_flags
746 #undef __print_symbolic
747 #undef __print_hex
748 #undef __print_hex_str
749 #undef __get_dynamic_array
750 #undef __get_dynamic_array_len
751 #undef __get_str
752 #undef __get_bitmask
753 #undef __print_array
754 
755 #undef TP_printk
756 #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
757 
758 #undef DECLARE_EVENT_CLASS
759 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
760 _TRACE_PERF_PROTO(call, PARAMS(proto));					\
761 static char print_fmt_##call[] = print;					\
762 static struct trace_event_class __used __refdata event_class_##call = { \
763 	.system			= TRACE_SYSTEM_STRING,			\
764 	.define_fields		= trace_event_define_fields_##call,	\
765 	.fields			= LIST_HEAD_INIT(event_class_##call.fields),\
766 	.raw_init		= trace_event_raw_init,			\
767 	.probe			= trace_event_raw_event_##call,		\
768 	.reg			= trace_event_reg,			\
769 	_TRACE_PERF_INIT(call)						\
770 };
771 
772 #undef DEFINE_EVENT
773 #define DEFINE_EVENT(template, call, proto, args)			\
774 									\
775 static struct trace_event_call __used event_##call = {			\
776 	.class			= &event_class_##template,		\
777 	{								\
778 		.tp			= &__tracepoint_##call,		\
779 	},								\
780 	.event.funcs		= &trace_event_type_funcs_##template,	\
781 	.print_fmt		= print_fmt_##template,			\
782 	.flags			= TRACE_EVENT_FL_TRACEPOINT,		\
783 };									\
784 static struct trace_event_call __used					\
785 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
786 
787 #undef DEFINE_EVENT_PRINT
788 #define DEFINE_EVENT_PRINT(template, call, proto, args, print)		\
789 									\
790 static char print_fmt_##call[] = print;					\
791 									\
792 static struct trace_event_call __used event_##call = {			\
793 	.class			= &event_class_##template,		\
794 	{								\
795 		.tp			= &__tracepoint_##call,		\
796 	},								\
797 	.event.funcs		= &trace_event_type_funcs_##call,	\
798 	.print_fmt		= print_fmt_##call,			\
799 	.flags			= TRACE_EVENT_FL_TRACEPOINT,		\
800 };									\
801 static struct trace_event_call __used					\
802 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
803 
804 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
805