include/trace/ftrace.h - arm/linux-arm64-legacy - Git at Google

 /*
  * Stage 1 of the trace events.
  *
  * Override the macros in <trace/trace_events.h> to include the following:
  *
  * struct ftrace_raw_<call> {
  *	struct trace_entry		ent;
  *	<type>				<item>;
  *	<type2>				<item2>[<len>];
  *	[...]
  * };
  *
  * The <type> <item> is created by the __field(type, item) macro or
  * the __array(type2, item2, len) macro.
  * We simply do "type item;", and that will create the fields
  * in the structure.
  */

 #include <linux/ftrace_event.h>

 #undef __field
 #define __field(type, item)		type	item;

 #undef __field_ext
 #define __field_ext(type, item, filter_type)	type	item;

 #undef __array
 #define __array(type, item, len)	type	item[len];

 #undef __dynamic_array
 #define __dynamic_array(type, item, len) u32 __data_loc_##item;

 #undef __string
 #define __string(item, src) __dynamic_array(char, item, -1)

 #undef TP_STRUCT__entry
 #define TP_STRUCT__entry(args...) args

 #undef TRACE_EVENT
 #define TRACE_EVENT(name, proto, args, tstruct, assign, print)	\
 	struct ftrace_raw_##name {				\
 		struct trace_entry	ent;			\
 		tstruct						\
 		char			__data[0];		\
 	};							\
 	static struct ftrace_event_call event_##name

 #undef __cpparg
 #define __cpparg(arg...) arg

 /* Callbacks are meaningless to ftrace. */
 #undef TRACE_EVENT_FN
 #define TRACE_EVENT_FN(name, proto, args, tstruct,			\
 		assign, print, reg, unreg)				\
 	TRACE_EVENT(name, __cpparg(proto), __cpparg(args),		\
 		__cpparg(tstruct), __cpparg(assign), __cpparg(print))	\

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)


 /*
  * Stage 2 of the trace events.
  *
  * Include the following:
  *
  * struct ftrace_data_offsets_<call> {
  *	u32				<item1>;
  *	u32				<item2>;
  *	[...]
  * };
  *
  * The __dynamic_array() macro will create each u32 <item>, this is
  * to keep the offset of each array from the beginning of the event.
  * The size of an array is also encoded, in the higher 16 bits of <item>.
  */

 #undef __field
 #define __field(type, item)

 #undef __field_ext
 #define __field_ext(type, item, filter_type)

 #undef __array
 #define __array(type, item, len)

 #undef __dynamic_array
 #define __dynamic_array(type, item, len)	u32 item;

 #undef __string
 #define __string(item, src) __dynamic_array(char, item, -1)

 #undef TRACE_EVENT
 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)		\
 	struct ftrace_data_offsets_##call {				\
 		tstruct;						\
 	};

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

 /*
  * Setup the showing format of trace point.
  *
  * int
  * ftrace_format_##call(struct trace_seq *s)
  * {
  *	struct ftrace_raw_##call field;
  *	int ret;
  *
  *	ret = trace_seq_printf(s, #type " " #item ";"
  *			       " offset:%u; size:%u;\n",
  *			       offsetof(struct ftrace_raw_##call, item),
  *			       sizeof(field.type));
  *
  * }
  */

 #undef TP_STRUCT__entry
 #define TP_STRUCT__entry(args...) args

 #undef __field
 #define __field(type, item)					\
 	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t"	\
 			       "offset:%u;\tsize:%u;\n",		\
 			       (unsigned int)offsetof(typeof(field), item), \
 			       (unsigned int)sizeof(field.item));	\
 	if (!ret)							\
 		return 0;

 #undef __field_ext
 #define __field_ext(type, item, filter_type)	__field(type, item)

 #undef __array
 #define __array(type, item, len)						\
 	ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"	\
 			       "offset:%u;\tsize:%u;\n",		\
 			       (unsigned int)offsetof(typeof(field), item), \
 			       (unsigned int)sizeof(field.item));	\
 	if (!ret)							\
 		return 0;

 #undef __dynamic_array
 #define __dynamic_array(type, item, len)				       \
 	ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
 			       "offset:%u;\tsize:%u;\n",		       \
 			       (unsigned int)offsetof(typeof(field),	       \
 					__data_loc_##item),		       \
 			       (unsigned int)sizeof(field.__data_loc_##item)); \
 	if (!ret)							       \
 		return 0;

 #undef __string
 #define __string(item, src) __dynamic_array(char, item, -1)

 #undef __entry
 #define __entry REC

 #undef __print_symbolic
 #undef __get_dynamic_array
 #undef __get_str

 #undef TP_printk
 #define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)

 #undef TP_fast_assign
 #define TP_fast_assign(args...) args

 #undef TP_perf_assign
 #define TP_perf_assign(args...)

 #undef TRACE_EVENT
 #define TRACE_EVENT(call, proto, args, tstruct, func, print)		\
 static int								\
 ftrace_format_##call(struct ftrace_event_call *unused,			\
 		      struct trace_seq *s)				\
 {									\
 	struct ftrace_raw_##call field __attribute__((unused));		\
 	int ret = 0;							\
 									\
 	tstruct;							\
 									\
 	trace_seq_printf(s, "\nprint fmt: " print);			\
 									\
 	return ret;							\
 }

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

 /*
  * Stage 3 of the trace events.
  *
  * Override the macros in <trace/trace_events.h> to include the following:
  *
  * enum print_line_t
  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
  * {
  *	struct trace_seq *s = &iter->seq;
  *	struct ftrace_raw_<call> *field; <-- defined in stage 1
  *	struct trace_entry *entry;
  *	struct trace_seq *p;
  *	int ret;
  *
  *	entry = iter->ent;
  *
  *	if (entry->type != event_<call>.id) {
  *		WARN_ON_ONCE(1);
  *		return TRACE_TYPE_UNHANDLED;
  *	}
  *
  *	field = (typeof(field))entry;
  *
  *	p = get_cpu_var(ftrace_event_seq);
  *	trace_seq_init(p);
  *	ret = trace_seq_printf(s, <TP_printk> "\n");
  *	put_cpu();
  *	if (!ret)
  *		return TRACE_TYPE_PARTIAL_LINE;
  *
  *	return TRACE_TYPE_HANDLED;
  * }
  *
  * This is the method used to print the raw event to the trace
  * output format. Note, this is not needed if the data is read
  * in binary.
  */

 #undef __entry
 #define __entry field

 #undef TP_printk
 #define TP_printk(fmt, args...) fmt "\n", args

 #undef __get_dynamic_array
 #define __get_dynamic_array(field)	\
 		((void *)__entry + (__entry->__data_loc_##field & 0xffff))

 #undef __get_str
 #define __get_str(field) (char *)__get_dynamic_array(field)

 #undef __print_flags
 #define __print_flags(flag, delim, flag_array...)			\
 	({								\
 		static const struct trace_print_flags __flags[] =	\
 			{ flag_array, { -1, NULL }};			\
 		ftrace_print_flags_seq(p, delim, flag, __flags);	\
 	})

 #undef __print_symbolic
 #define __print_symbolic(value, symbol_array...)			\
 	({								\
 		static const struct trace_print_flags symbols[] =	\
 			{ symbol_array, { -1, NULL }};			\
 		ftrace_print_symbols_seq(p, value, symbols);		\
 	})

 #undef TRACE_EVENT
 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)		\
 static enum print_line_t						\
 ftrace_raw_output_##call(struct trace_iterator *iter, int flags)	\
 {									\
 	struct trace_seq *s = &iter->seq;				\
 	struct ftrace_raw_##call *field;				\
 	struct trace_entry *entry;					\
 	struct trace_seq *p;						\
 	int ret;							\
 									\
 	entry = iter->ent;						\
 									\
 	if (entry->type != event_##call.id) {				\
 		WARN_ON_ONCE(1);					\
 		return TRACE_TYPE_UNHANDLED;				\
 	}								\
 									\
 	field = (typeof(field))entry;					\
 									\
 	p = &get_cpu_var(ftrace_event_seq);				\
 	trace_seq_init(p);						\
 	ret = trace_seq_printf(s, #call ": " print);			\
 	put_cpu();							\
 	if (!ret)							\
 		return TRACE_TYPE_PARTIAL_LINE;				\
 									\
 	return TRACE_TYPE_HANDLED;					\
 }

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

 #undef __field_ext
 #define __field_ext(type, item, filter_type)				\
 	ret = trace_define_field(event_call, #type, #item,		\
 				 offsetof(typeof(field), item),		\
 				 sizeof(field.item),			\
 				 is_signed_type(type), filter_type);	\
 	if (ret)							\
 		return ret;

 #undef __field
 #define __field(type, item)	__field_ext(type, item, FILTER_OTHER)

 #undef __array
 #define __array(type, item, len)					\
 	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);				\
 	ret = trace_define_field(event_call, #type "[" #len "]", #item,	\
 				 offsetof(typeof(field), item),		\
 				 sizeof(field.item), 0, FILTER_OTHER);	\
 	if (ret)							\
 		return ret;

 #undef __dynamic_array
 #define __dynamic_array(type, item, len)				       \
 	ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
 				 offsetof(typeof(field), __data_loc_##item),   \
 				 sizeof(field.__data_loc_##item), 0,	       \
 				 FILTER_OTHER);

 #undef __string
 #define __string(item, src) __dynamic_array(char, item, -1)

 #undef TRACE_EVENT
 #define TRACE_EVENT(call, proto, args, tstruct, func, print)		\
 static int								\
 ftrace_define_fields_##call(struct ftrace_event_call *event_call)	\
 {									\
 	struct ftrace_raw_##call field;					\
 	int ret;							\
 									\
 	ret = trace_define_common_fields(event_call);			\
 	if (ret)							\
 		return ret;						\
 									\
 	tstruct;							\
 									\
 	return ret;							\
 }

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

 /*
  * remember the offset of each array from the beginning of the event.
  */

 #undef __entry
 #define __entry entry

 #undef __field
 #define __field(type, item)

 #undef __field_ext
 #define __field_ext(type, item, filter_type)

 #undef __array
 #define __array(type, item, len)

 #undef __dynamic_array
 #define __dynamic_array(type, item, len)				\
 	__data_offsets->item = __data_size +				\
 			       offsetof(typeof(*entry), __data);	\
 	__data_offsets->item |= (len * sizeof(type)) << 16;		\
 	__data_size += (len) * sizeof(type);

 #undef __string
 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)       \

 #undef TRACE_EVENT
 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)		\
 static inline int ftrace_get_offsets_##call(				\
 	struct ftrace_data_offsets_##call *__data_offsets, proto)       \
 {									\
 	int __data_size = 0;						\
 	struct ftrace_raw_##call __maybe_unused *entry;			\
 									\
 	tstruct;							\
 									\
 	return __data_size;						\
 }

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

 #ifdef CONFIG_EVENT_PROFILE

 /*
  * Generate the functions needed for tracepoint perf_event support.
  *
  * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
  *
  * static int ftrace_profile_enable_<call>(struct ftrace_event_call *event_call)
  * {
  * 	int ret = 0;
  *
  * 	if (!atomic_inc_return(&event_call->profile_count))
  * 		ret = register_trace_<call>(ftrace_profile_<call>);
  *
  * 	return ret;
  * }
  *
  * static void ftrace_profile_disable_<call>(struct ftrace_event_call *event_call)
  * {
  * 	if (atomic_add_negative(-1, &event->call->profile_count))
  * 		unregister_trace_<call>(ftrace_profile_<call>);
  * }
  *
  */

 #undef TRACE_EVENT
 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)		\
 									\
 static void ftrace_profile_##call(proto);				\
 									\
 static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
 {									\
 	int ret = 0;							\
 									\
 	if (!atomic_inc_return(&event_call->profile_count))		\
 		ret = register_trace_##call(ftrace_profile_##call);	\
 									\
 	return ret;							\
 }									\
 									\
 static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
 {									\
 	if (atomic_add_negative(-1, &event_call->profile_count))	\
 		unregister_trace_##call(ftrace_profile_##call);		\
 }

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

 #endif

 /*
  * Stage 4 of the trace events.
  *
  * Override the macros in <trace/trace_events.h> to include the following:
  *
  * static void ftrace_event_<call>(proto)
  * {
  *	event_trace_printk(_RET_IP_, "<call>: " <fmt>);
  * }
  *
  * static int ftrace_reg_event_<call>(void)
  * {
  *	int ret;
  *
  *	ret = register_trace_<call>(ftrace_event_<call>);
  *	if (!ret)
  *		pr_info("event trace: Could not activate trace point "
  *			"probe to  <call>");
  *	return ret;
  * }
  *
  * static void ftrace_unreg_event_<call>(void)
  * {
  *	unregister_trace_<call>(ftrace_event_<call>);
  * }
  *
  *
  * For those macros defined with TRACE_EVENT:
  *
  * static struct ftrace_event_call event_<call>;
  *
  * static void ftrace_raw_event_<call>(proto)
  * {
  *	struct ring_buffer_event *event;
  *	struct ftrace_raw_<call> *entry; <-- defined in stage 1
  *	struct ring_buffer *buffer;
  *	unsigned long irq_flags;
  *	int pc;
  *
  *	local_save_flags(irq_flags);
  *	pc = preempt_count();
  *
  *	event = trace_current_buffer_lock_reserve(&buffer,
  *				  event_<call>.id,
  *				  sizeof(struct ftrace_raw_<call>),
  *				  irq_flags, pc);
  *	if (!event)
  *		return;
  *	entry	= ring_buffer_event_data(event);
  *
  *	<assign>;  <-- Here we assign the entries by the __field and
  *			__array macros.
  *
  *	trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
  * }
  *
  * static int ftrace_raw_reg_event_<call>(void)
  * {
  *	int ret;
  *
  *	ret = register_trace_<call>(ftrace_raw_event_<call>);
  *	if (!ret)
  *		pr_info("event trace: Could not activate trace point "
  *			"probe to <call>");
  *	return ret;
  * }
  *
  * static void ftrace_unreg_event_<call>(void)
  * {
  *	unregister_trace_<call>(ftrace_raw_event_<call>);
  * }
  *
  * static struct trace_event ftrace_event_type_<call> = {
  *	.trace			= ftrace_raw_output_<call>, <-- stage 2
  * };
  *
  * static int ftrace_raw_init_event_<call>(void)
  * {
  *	int id;
  *
  *	id = register_ftrace_event(&ftrace_event_type_<call>);
  *	if (!id)
  *		return -ENODEV;
  *	event_<call>.id = id;
  *	return 0;
  * }
  *
  * static struct ftrace_event_call __used
  * __attribute__((__aligned__(4)))
  * __attribute__((section("_ftrace_events"))) event_<call> = {
  *	.name			= "<call>",
  *	.system			= "<system>",
  *	.raw_init		= ftrace_raw_init_event_<call>,
  *	.regfunc		= ftrace_reg_event_<call>,
  *	.unregfunc		= ftrace_unreg_event_<call>,
  *	.show_format		= ftrace_format_<call>,
  * }
  *
  */

 #undef TP_FMT
 #define TP_FMT(fmt, args...)	fmt "\n", ##args

 #ifdef CONFIG_EVENT_PROFILE

 #define _TRACE_PROFILE_INIT(call)					\
 	.profile_count = ATOMIC_INIT(-1),				\
 	.profile_enable = ftrace_profile_enable_##call,			\
 	.profile_disable = ftrace_profile_disable_##call,

 #else
 #define _TRACE_PROFILE_INIT(call)
 #endif

 #undef __entry
 #define __entry entry

 #undef __field
 #define __field(type, item)

 #undef __array
 #define __array(type, item, len)

 #undef __dynamic_array
 #define __dynamic_array(type, item, len)				\
 	__entry->__data_loc_##item = __data_offsets.item;

 #undef __string
 #define __string(item, src) __dynamic_array(char, item, -1)       	\

 #undef __assign_str
 #define __assign_str(dst, src)						\
 	strcpy(__get_str(dst), src);

 #undef TRACE_EVENT
 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)		\
 									\
 static struct ftrace_event_call event_##call;				\
 									\
 static void ftrace_raw_event_##call(proto)				\
 {									\
 	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 	struct ftrace_event_call *event_call = &event_##call;		\
 	struct ring_buffer_event *event;				\
 	struct ftrace_raw_##call *entry;				\
 	struct ring_buffer *buffer;					\
 	unsigned long irq_flags;					\
 	int __data_size;						\
 	int pc;								\
 									\
 	local_save_flags(irq_flags);					\
 	pc = preempt_count();						\
 									\
 	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 									\
 	event = trace_current_buffer_lock_reserve(&buffer,		\
 				 event_##call.id,			\
 				 sizeof(*entry) + __data_size,		\
 				 irq_flags, pc);			\
 	if (!event)							\
 		return;							\
 	entry	= ring_buffer_event_data(event);			\
 									\
 									\
 	tstruct								\
 									\
 	{ assign; }							\
 									\
 	if (!filter_current_check_discard(buffer, event_call, entry, event)) \
 		trace_nowake_buffer_unlock_commit(buffer,		\
 						  event, irq_flags, pc); \
 }									\
 									\
 static int ftrace_raw_reg_event_##call(void *ptr)			\
 {									\
 	int ret;							\
 									\
 	ret = register_trace_##call(ftrace_raw_event_##call);		\
 	if (ret)							\
 		pr_info("event trace: Could not activate trace point "	\
 			"probe to " #call "\n");			\
 	return ret;							\
 }									\
 									\
 static void ftrace_raw_unreg_event_##call(void *ptr)			\
 {									\
 	unregister_trace_##call(ftrace_raw_event_##call);		\
 }									\
 									\
 static struct trace_event ftrace_event_type_##call = {			\
 	.trace			= ftrace_raw_output_##call,		\
 };									\
 									\
 static int ftrace_raw_init_event_##call(void)				\
 {									\
 	int id;								\
 									\
 	id = register_ftrace_event(&ftrace_event_type_##call);		\
 	if (!id)							\
 		return -ENODEV;						\
 	event_##call.id = id;						\
 	INIT_LIST_HEAD(&event_##call.fields);				\
 	return 0;							\
 }									\
 									\
 static struct ftrace_event_call __used					\
 __attribute__((__aligned__(4)))						\
 __attribute__((section("_ftrace_events"))) event_##call = {		\
 	.name			= #call,				\
 	.system			= __stringify(TRACE_SYSTEM),		\
 	.event			= &ftrace_event_type_##call,		\
 	.raw_init		= ftrace_raw_init_event_##call,		\
 	.regfunc		= ftrace_raw_reg_event_##call,		\
 	.unregfunc		= ftrace_raw_unreg_event_##call,	\
 	.show_format		= ftrace_format_##call,			\
 	.define_fields		= ftrace_define_fields_##call,		\
 	_TRACE_PROFILE_INIT(call)					\
 }

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

 /*
  * Define the insertion callback to profile events
  *
  * The job is very similar to ftrace_raw_event_<call> except that we don't
  * insert in the ring buffer but in a perf counter.
  *
  * static void ftrace_profile_<call>(proto)
  * {
  *	struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
  *	struct ftrace_event_call *event_call = &event_<call>;
  *	extern void perf_tp_event(int, u64, u64, void *, int);
  *	struct ftrace_raw_##call *entry;
  *	u64 __addr = 0, __count = 1;
  *	unsigned long irq_flags;
  *	int __entry_size;
  *	int __data_size;
  *	int pc;
  *
  *	local_save_flags(irq_flags);
  *	pc = preempt_count();
  *
  *	__data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
  *
  *	// Below we want to get the aligned size by taking into account
  *	// the u32 field that will later store the buffer size
  *	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
  *			     sizeof(u64));
  *	__entry_size -= sizeof(u32);
  *
  *	do {
  *		char raw_data[__entry_size]; <- allocate our sample in the stack
  *		struct trace_entry *ent;
  *
  *		zero dead bytes from alignment to avoid stack leak to userspace:
  *
  *		*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
  *		entry = (struct ftrace_raw_<call> *)raw_data;
  *		ent = &entry->ent;
  *		tracing_generic_entry_update(ent, irq_flags, pc);
  *		ent->type = event_call->id;
  *
  *		<tstruct> <- do some jobs with dynamic arrays
  *
  *		<assign>  <- affect our values
  *
  *		perf_tp_event(event_call->id, __addr, __count, entry,
  *			     __entry_size);  <- submit them to perf counter
  *	} while (0);
  *
  * }
  */

 #ifdef CONFIG_EVENT_PROFILE

 #undef __perf_addr
 #define __perf_addr(a) __addr = (a)

 #undef __perf_count
 #define __perf_count(c) __count = (c)

 #undef TRACE_EVENT
 #define TRACE_EVENT(call, proto, args, tstruct, assign, print)		\
 static void ftrace_profile_##call(proto)				\
 {									\
 	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
 	struct ftrace_event_call *event_call = &event_##call;		\
 	extern void perf_tp_event(int, u64, u64, void *, int);	\
 	struct ftrace_raw_##call *entry;				\
 	u64 __addr = 0, __count = 1;					\
 	unsigned long irq_flags;					\
 	int __entry_size;						\
 	int __data_size;						\
 	int pc;								\
 									\
 	local_save_flags(irq_flags);					\
 	pc = preempt_count();						\
 									\
 	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
 	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
 			     sizeof(u64));				\
 	__entry_size -= sizeof(u32);					\
 									\
 	do {								\
 		char raw_data[__entry_size];				\
 		struct trace_entry *ent;				\
 									\
 		*(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;	\
 		entry = (struct ftrace_raw_##call *)raw_data;		\
 		ent = &entry->ent;					\
 		tracing_generic_entry_update(ent, irq_flags, pc);	\
 		ent->type = event_call->id;				\
 									\
 		tstruct							\
 									\
 		{ assign; }						\
 									\
 		perf_tp_event(event_call->id, __addr, __count, entry,\
 			     __entry_size);				\
 	} while (0);							\
 									\
 }

 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 #endif /* CONFIG_EVENT_PROFILE */

 #undef _TRACE_PROFILE_INIT
	/*
	* Stage 1 of the trace events.
	*
	* Override the macros in <trace/trace_events.h> to include the following:
	*
	* struct ftrace_raw_<call> {
	* struct trace_entry ent;
	* <type> <item>;
	* <type2> <item2>[<len>];
	* [...]
	* };
	*
	* The <type> <item> is created by the __field(type, item) macro or
	* the __array(type2, item2, len) macro.
	* We simply do "type item;", and that will create the fields
	* in the structure.
	*/

	#include <linux/ftrace_event.h>

	#undef __field
	#define __field(type, item) type item;

	#undef __field_ext
	#define __field_ext(type, item, filter_type) type item;

	#undef __array
	#define __array(type, item, len) type item[len];

	#undef __dynamic_array
	#define __dynamic_array(type, item, len) u32 __data_loc_##item;

	#undef __string
	#define __string(item, src) __dynamic_array(char, item, -1)

	#undef TP_STRUCT__entry
	#define TP_STRUCT__entry(args...) args

	#undef TRACE_EVENT
	#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
	struct ftrace_raw_##name { \
	struct trace_entry ent; \
	tstruct \
	char __data[0]; \
	}; \
	static struct ftrace_event_call event_##name

	#undef __cpparg
	#define __cpparg(arg...) arg

	/* Callbacks are meaningless to ftrace. */
	#undef TRACE_EVENT_FN
	#define TRACE_EVENT_FN(name, proto, args, tstruct, \
	assign, print, reg, unreg) \
	TRACE_EVENT(name, __cpparg(proto), __cpparg(args), \
	__cpparg(tstruct), __cpparg(assign), __cpparg(print)) \

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)


	/*
	* Stage 2 of the trace events.
	*
	* Include the following:
	*
	* struct ftrace_data_offsets_<call> {
	* u32 <item1>;
	* u32 <item2>;
	* [...]
	* };
	*
	* The __dynamic_array() macro will create each u32 <item>, this is
	* to keep the offset of each array from the beginning of the event.
	* The size of an array is also encoded, in the higher 16 bits of <item>.
	*/

	#undef __field
	#define __field(type, item)

	#undef __field_ext
	#define __field_ext(type, item, filter_type)

	#undef __array
	#define __array(type, item, len)

	#undef __dynamic_array
	#define __dynamic_array(type, item, len) u32 item;

	#undef __string
	#define __string(item, src) __dynamic_array(char, item, -1)

	#undef TRACE_EVENT
	#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
	struct ftrace_data_offsets_##call { \
	tstruct; \
	};

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

	/*
	* Setup the showing format of trace point.
	*
	* int
	* ftrace_format_##call(struct trace_seq *s)
	* {
	* struct ftrace_raw_##call field;
	* int ret;
	*
	* ret = trace_seq_printf(s, #type " " #item ";"
	* " offset:%u; size:%u;\n",
	* offsetof(struct ftrace_raw_##call, item),
	* sizeof(field.type));
	*
	* }
	*/

	#undef TP_STRUCT__entry
	#define TP_STRUCT__entry(args...) args

	#undef __field
	#define __field(type, item) \
	ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
	"offset:%u;\tsize:%u;\n", \
	(unsigned int)offsetof(typeof(field), item), \
	(unsigned int)sizeof(field.item)); \
	if (!ret) \
	return 0;

	#undef __field_ext
	#define __field_ext(type, item, filter_type) __field(type, item)

	#undef __array
	#define __array(type, item, len) \
	ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
	"offset:%u;\tsize:%u;\n", \
	(unsigned int)offsetof(typeof(field), item), \
	(unsigned int)sizeof(field.item)); \
	if (!ret) \
	return 0;

	#undef __dynamic_array
	#define __dynamic_array(type, item, len) \
	ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
	"offset:%u;\tsize:%u;\n", \
	(unsigned int)offsetof(typeof(field), \
	__data_loc_##item), \
	(unsigned int)sizeof(field.__data_loc_##item)); \
	if (!ret) \
	return 0;

	#undef __string
	#define __string(item, src) __dynamic_array(char, item, -1)

	#undef __entry
	#define __entry REC

	#undef __print_symbolic
	#undef __get_dynamic_array
	#undef __get_str

	#undef TP_printk
	#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)

	#undef TP_fast_assign
	#define TP_fast_assign(args...) args

	#undef TP_perf_assign
	#define TP_perf_assign(args...)

	#undef TRACE_EVENT
	#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
	static int \
	ftrace_format_##call(struct ftrace_event_call *unused, \
	struct trace_seq *s) \
	{ \
	struct ftrace_raw_##call field __attribute__((unused)); \
	int ret = 0; \
	\
	tstruct; \
	\
	trace_seq_printf(s, "\nprint fmt: " print); \
	\
	return ret; \
	}

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

	/*
	* Stage 3 of the trace events.
	*
	* Override the macros in <trace/trace_events.h> to include the following:
	*
	* enum print_line_t
	* ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
	* {
	* struct trace_seq *s = &iter->seq;
	* struct ftrace_raw_<call> *field; <-- defined in stage 1
	* struct trace_entry *entry;
	* struct trace_seq *p;
	* int ret;
	*
	* entry = iter->ent;
	*
	* if (entry->type != event_<call>.id) {
	* WARN_ON_ONCE(1);
	* return TRACE_TYPE_UNHANDLED;
	* }
	*
	* field = (typeof(field))entry;
	*
	* p = get_cpu_var(ftrace_event_seq);
	* trace_seq_init(p);
	* ret = trace_seq_printf(s, <TP_printk> "\n");
	* put_cpu();
	* if (!ret)
	* return TRACE_TYPE_PARTIAL_LINE;
	*
	* return TRACE_TYPE_HANDLED;
	* }
	*
	* This is the method used to print the raw event to the trace
	* output format. Note, this is not needed if the data is read
	* in binary.
	*/

	#undef __entry
	#define __entry field

	#undef TP_printk
	#define TP_printk(fmt, args...) fmt "\n", args

	#undef __get_dynamic_array
	#define __get_dynamic_array(field) \
	((void *)__entry + (__entry->__data_loc_##field & 0xffff))

	#undef __get_str
	#define __get_str(field) (char *)__get_dynamic_array(field)

	#undef __print_flags
	#define __print_flags(flag, delim, flag_array...) \
	({ \
	static const struct trace_print_flags __flags[] = \
	{ flag_array, { -1, NULL }}; \
	ftrace_print_flags_seq(p, delim, flag, __flags); \
	})

	#undef __print_symbolic
	#define __print_symbolic(value, symbol_array...) \
	({ \
	static const struct trace_print_flags symbols[] = \
	{ symbol_array, { -1, NULL }}; \
	ftrace_print_symbols_seq(p, value, symbols); \
	})

	#undef TRACE_EVENT
	#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
	static enum print_line_t \
	ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
	{ \
	struct trace_seq *s = &iter->seq; \
	struct ftrace_raw_##call *field; \
	struct trace_entry *entry; \
	struct trace_seq *p; \
	int ret; \
	\
	entry = iter->ent; \
	\
	if (entry->type != event_##call.id) { \
	WARN_ON_ONCE(1); \
	return TRACE_TYPE_UNHANDLED; \
	} \
	\
	field = (typeof(field))entry; \
	\
	p = &get_cpu_var(ftrace_event_seq); \
	trace_seq_init(p); \
	ret = trace_seq_printf(s, #call ": " print); \
	put_cpu(); \
	if (!ret) \
	return TRACE_TYPE_PARTIAL_LINE; \
	\
	return TRACE_TYPE_HANDLED; \
	}

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

	#undef __field_ext
	#define __field_ext(type, item, filter_type) \
	ret = trace_define_field(event_call, #type, #item, \
	offsetof(typeof(field), item), \
	sizeof(field.item), \
	is_signed_type(type), filter_type); \
	if (ret) \
	return ret;

	#undef __field
	#define __field(type, item) __field_ext(type, item, FILTER_OTHER)

	#undef __array
	#define __array(type, item, len) \
	BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
	ret = trace_define_field(event_call, #type "[" #len "]", #item, \
	offsetof(typeof(field), item), \
	sizeof(field.item), 0, FILTER_OTHER); \
	if (ret) \
	return ret;

	#undef __dynamic_array
	#define __dynamic_array(type, item, len) \
	ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
	offsetof(typeof(field), __data_loc_##item), \
	sizeof(field.__data_loc_##item), 0, \
	FILTER_OTHER);

	#undef __string
	#define __string(item, src) __dynamic_array(char, item, -1)

	#undef TRACE_EVENT
	#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
	static int \
	ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
	{ \
	struct ftrace_raw_##call field; \
	int ret; \
	\
	ret = trace_define_common_fields(event_call); \
	if (ret) \
	return ret; \
	\
	tstruct; \
	\
	return ret; \
	}

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

	/*
	* remember the offset of each array from the beginning of the event.
	*/

	#undef __entry
	#define __entry entry

	#undef __field
	#define __field(type, item)

	#undef __field_ext
	#define __field_ext(type, item, filter_type)

	#undef __array
	#define __array(type, item, len)

	#undef __dynamic_array
	#define __dynamic_array(type, item, len) \
	__data_offsets->item = __data_size + \
	offsetof(typeof(*entry), __data); \
	__data_offsets->item \|= (len * sizeof(type)) << 16; \
	__data_size += (len) * sizeof(type);

	#undef __string
	#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1) \

	#undef TRACE_EVENT
	#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
	static inline int ftrace_get_offsets_##call( \
	struct ftrace_data_offsets_##call *__data_offsets, proto) \
	{ \
	int __data_size = 0; \
	struct ftrace_raw_##call __maybe_unused *entry; \
	\
	tstruct; \
	\
	return __data_size; \
	}

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

	#ifdef CONFIG_EVENT_PROFILE

	/*
	* Generate the functions needed for tracepoint perf_event support.
	*
	* NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
	*
	* static int ftrace_profile_enable_<call>(struct ftrace_event_call *event_call)
	* {
	* int ret = 0;
	*
	* if (!atomic_inc_return(&event_call->profile_count))
	* ret = register_trace_<call>(ftrace_profile_<call>);
	*
	* return ret;
	* }
	*
	* static void ftrace_profile_disable_<call>(struct ftrace_event_call *event_call)
	* {
	* if (atomic_add_negative(-1, &event->call->profile_count))
	* unregister_trace_<call>(ftrace_profile_<call>);
	* }
	*
	*/

	#undef TRACE_EVENT
	#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
	\
	static void ftrace_profile_##call(proto); \
	\
	static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
	{ \
	int ret = 0; \
	\
	if (!atomic_inc_return(&event_call->profile_count)) \
	ret = register_trace_##call(ftrace_profile_##call); \
	\
	return ret; \
	} \
	\
	static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
	{ \
	if (atomic_add_negative(-1, &event_call->profile_count)) \
	unregister_trace_##call(ftrace_profile_##call); \
	}

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

	#endif

	/*
	* Stage 4 of the trace events.
	*
	* Override the macros in <trace/trace_events.h> to include the following:
	*
	* static void ftrace_event_<call>(proto)
	* {
	* event_trace_printk(_RET_IP_, "<call>: " <fmt>);
	* }
	*
	* static int ftrace_reg_event_<call>(void)
	* {
	* int ret;
	*
	* ret = register_trace_<call>(ftrace_event_<call>);
	* if (!ret)
	* pr_info("event trace: Could not activate trace point "
	* "probe to <call>");
	* return ret;
	* }
	*
	* static void ftrace_unreg_event_<call>(void)
	* {
	* unregister_trace_<call>(ftrace_event_<call>);
	* }
	*
	*
	* For those macros defined with TRACE_EVENT:
	*
	* static struct ftrace_event_call event_<call>;
	*
	* static void ftrace_raw_event_<call>(proto)
	* {
	* struct ring_buffer_event *event;
	* struct ftrace_raw_<call> *entry; <-- defined in stage 1
	* struct ring_buffer *buffer;
	* unsigned long irq_flags;
	* int pc;
	*
	* local_save_flags(irq_flags);
	* pc = preempt_count();
	*
	* event = trace_current_buffer_lock_reserve(&buffer,
	* event_<call>.id,
	* sizeof(struct ftrace_raw_<call>),
	* irq_flags, pc);
	* if (!event)
	* return;
	* entry = ring_buffer_event_data(event);
	*
	* <assign>; <-- Here we assign the entries by the __field and
	* __array macros.
	*
	* trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
	* }
	*
	* static int ftrace_raw_reg_event_<call>(void)
	* {
	* int ret;
	*
	* ret = register_trace_<call>(ftrace_raw_event_<call>);
	* if (!ret)
	* pr_info("event trace: Could not activate trace point "
	* "probe to <call>");
	* return ret;
	* }
	*
	* static void ftrace_unreg_event_<call>(void)
	* {
	* unregister_trace_<call>(ftrace_raw_event_<call>);
	* }
	*
	* static struct trace_event ftrace_event_type_<call> = {
	* .trace = ftrace_raw_output_<call>, <-- stage 2
	* };
	*
	* static int ftrace_raw_init_event_<call>(void)
	* {
	* int id;
	*
	* id = register_ftrace_event(&ftrace_event_type_<call>);
	* if (!id)
	* return -ENODEV;
	* event_<call>.id = id;
	* return 0;
	* }
	*
	* static struct ftrace_event_call __used
	* __attribute__((__aligned__(4)))
	* __attribute__((section("_ftrace_events"))) event_<call> = {
	* .name = "<call>",
	* .system = "<system>",
	* .raw_init = ftrace_raw_init_event_<call>,
	* .regfunc = ftrace_reg_event_<call>,
	* .unregfunc = ftrace_unreg_event_<call>,
	* .show_format = ftrace_format_<call>,
	* }
	*
	*/

	#undef TP_FMT
	#define TP_FMT(fmt, args...) fmt "\n", ##args

	#ifdef CONFIG_EVENT_PROFILE

	#define _TRACE_PROFILE_INIT(call) \
	.profile_count = ATOMIC_INIT(-1), \
	.profile_enable = ftrace_profile_enable_##call, \
	.profile_disable = ftrace_profile_disable_##call,

	#else
	#define _TRACE_PROFILE_INIT(call)
	#endif

	#undef __entry
	#define __entry entry

	#undef __field
	#define __field(type, item)

	#undef __array
	#define __array(type, item, len)

	#undef __dynamic_array
	#define __dynamic_array(type, item, len) \
	__entry->__data_loc_##item = __data_offsets.item;

	#undef __string
	#define __string(item, src) __dynamic_array(char, item, -1) \

	#undef __assign_str
	#define __assign_str(dst, src) \
	strcpy(__get_str(dst), src);

	#undef TRACE_EVENT
	#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
	\
	static struct ftrace_event_call event_##call; \
	\
	static void ftrace_raw_event_##call(proto) \
	{ \
	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
	struct ftrace_event_call *event_call = &event_##call; \
	struct ring_buffer_event *event; \
	struct ftrace_raw_##call *entry; \
	struct ring_buffer *buffer; \
	unsigned long irq_flags; \
	int __data_size; \
	int pc; \
	\
	local_save_flags(irq_flags); \
	pc = preempt_count(); \
	\
	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
	\
	event = trace_current_buffer_lock_reserve(&buffer, \
	event_##call.id, \
	sizeof(*entry) + __data_size, \
	irq_flags, pc); \
	if (!event) \
	return; \
	entry = ring_buffer_event_data(event); \
	\
	\
	tstruct \
	\
	{ assign; } \
	\
	if (!filter_current_check_discard(buffer, event_call, entry, event)) \
	trace_nowake_buffer_unlock_commit(buffer, \
	event, irq_flags, pc); \
	} \
	\
	static int ftrace_raw_reg_event_##call(void *ptr) \
	{ \
	int ret; \
	\
	ret = register_trace_##call(ftrace_raw_event_##call); \
	if (ret) \
	pr_info("event trace: Could not activate trace point " \
	"probe to " #call "\n"); \
	return ret; \
	} \
	\
	static void ftrace_raw_unreg_event_##call(void *ptr) \
	{ \
	unregister_trace_##call(ftrace_raw_event_##call); \
	} \
	\
	static struct trace_event ftrace_event_type_##call = { \
	.trace = ftrace_raw_output_##call, \
	}; \
	\
	static int ftrace_raw_init_event_##call(void) \
	{ \
	int id; \
	\
	id = register_ftrace_event(&ftrace_event_type_##call); \
	if (!id) \
	return -ENODEV; \
	event_##call.id = id; \
	INIT_LIST_HEAD(&event_##call.fields); \
	return 0; \
	} \
	\
	static struct ftrace_event_call __used \
	__attribute__((__aligned__(4))) \
	__attribute__((section("_ftrace_events"))) event_##call = { \
	.name = #call, \
	.system = __stringify(TRACE_SYSTEM), \
	.event = &ftrace_event_type_##call, \
	.raw_init = ftrace_raw_init_event_##call, \
	.regfunc = ftrace_raw_reg_event_##call, \
	.unregfunc = ftrace_raw_unreg_event_##call, \
	.show_format = ftrace_format_##call, \
	.define_fields = ftrace_define_fields_##call, \
	_TRACE_PROFILE_INIT(call) \
	}

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

	/*
	* Define the insertion callback to profile events
	*
	* The job is very similar to ftrace_raw_event_<call> except that we don't
	* insert in the ring buffer but in a perf counter.
	*
	* static void ftrace_profile_<call>(proto)
	* {
	* struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
	* struct ftrace_event_call *event_call = &event_<call>;
	* extern void perf_tp_event(int, u64, u64, void *, int);
	* struct ftrace_raw_##call *entry;
	* u64 __addr = 0, __count = 1;
	* unsigned long irq_flags;
	* int __entry_size;
	* int __data_size;
	* int pc;
	*
	* local_save_flags(irq_flags);
	* pc = preempt_count();
	*
	* __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
	*
	* // Below we want to get the aligned size by taking into account
	* // the u32 field that will later store the buffer size
	* __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
	* sizeof(u64));
	* __entry_size -= sizeof(u32);
	*
	* do {
	* char raw_data[__entry_size]; <- allocate our sample in the stack
	* struct trace_entry *ent;
	*
	* zero dead bytes from alignment to avoid stack leak to userspace:
	*
	* (u64 )(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
	* entry = (struct ftrace_raw_<call> *)raw_data;
	* ent = &entry->ent;
	* tracing_generic_entry_update(ent, irq_flags, pc);
	* ent->type = event_call->id;
	*
	* <tstruct> <- do some jobs with dynamic arrays
	*
	* <assign> <- affect our values
	*
	* perf_tp_event(event_call->id, __addr, __count, entry,
	* __entry_size); <- submit them to perf counter
	* } while (0);
	*
	* }
	*/

	#ifdef CONFIG_EVENT_PROFILE

	#undef __perf_addr
	#define __perf_addr(a) __addr = (a)

	#undef __perf_count
	#define __perf_count(c) __count = (c)

	#undef TRACE_EVENT
	#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
	static void ftrace_profile_##call(proto) \
	{ \
	struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
	struct ftrace_event_call *event_call = &event_##call; \
	extern void perf_tp_event(int, u64, u64, void *, int); \
	struct ftrace_raw_##call *entry; \
	u64 __addr = 0, __count = 1; \
	unsigned long irq_flags; \
	int __entry_size; \
	int __data_size; \
	int pc; \
	\
	local_save_flags(irq_flags); \
	pc = preempt_count(); \
	\
	__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
	sizeof(u64)); \
	__entry_size -= sizeof(u32); \
	\
	do { \
	char raw_data[__entry_size]; \
	struct trace_entry *ent; \
	\
	(u64 )(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
	entry = (struct ftrace_raw_##call *)raw_data; \
	ent = &entry->ent; \
	tracing_generic_entry_update(ent, irq_flags, pc); \
	ent->type = event_call->id; \
	\
	tstruct \
	\
	{ assign; } \
	\
	perf_tp_event(event_call->id, __addr, __count, entry,\
	__entry_size); \
	} while (0); \
	\
	}

	#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
	#endif /* CONFIG_EVENT_PROFILE */

	#undef _TRACE_PROFILE_INIT