[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / tracepoint.h

#ifndef _LINUX_TRACEPOINT_H
#define _LINUX_TRACEPOINT_H

/*
 * Kernel Tracepoint API.
 *
 * See Documentation/trace/tracepoints.txt.
 *
 * (C) Copyright 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
 *
 * Heavily inspired from the Linux Kernel Markers.
 *
 * This file is released under the GPLv2.
 * See the file COPYING for more details.
 */

#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/percpu.h>
#include <linux/cpumask.h>
#include <linux/rcupdate.h>
#include <linux/static_key.h>

struct module;
struct tracepoint;

struct tracepoint_func {
	void *func;
	void *data;
};

struct tracepoint {
	const char *name;		/* Tracepoint name */
	struct static_key key;
	void (*regfunc)(void);
	void (*unregfunc)(void);
	struct tracepoint_func __rcu *funcs;
};

/*
 * Connect a probe to a tracepoint.
 * Internal API, should not be used directly.
 */
extern int tracepoint_probe_register(const char *name, void *probe, void *data);

/*
 * Disconnect a probe from a tracepoint.
 * Internal API, should not be used directly.
 */
extern int
tracepoint_probe_unregister(const char *name, void *probe, void *data);

extern int tracepoint_probe_register_noupdate(const char *name, void *probe,
					      void *data);
extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe,
						void *data);
extern void tracepoint_probe_update_all(void);

#ifdef CONFIG_MODULES
struct tp_module {
	struct list_head list;
	unsigned int num_tracepoints;
	struct tracepoint * const *tracepoints_ptrs;
};
bool trace_module_has_bad_taint(struct module *mod);
#else
static inline bool trace_module_has_bad_taint(struct module *mod)
{
	return false;
}
#endif /* CONFIG_MODULES */

struct tracepoint_iter {
#ifdef CONFIG_MODULES
	struct tp_module *module;
#endif /* CONFIG_MODULES */
	struct tracepoint * const *tracepoint;
};

extern void tracepoint_iter_start(struct tracepoint_iter *iter);
extern void tracepoint_iter_next(struct tracepoint_iter *iter);
extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
extern void tracepoint_iter_reset(struct tracepoint_iter *iter);

/*
 * tracepoint_synchronize_unregister must be called between the last tracepoint
 * probe unregistration and the end of module exit to make sure there is no
 * caller executing a probe when it is freed.
 */
static inline void tracepoint_synchronize_unregister(void)
{
	synchronize_sched();
}

#define PARAMS(args...) args

#endif /* _LINUX_TRACEPOINT_H */

/*
 * Note: we keep the TRACE_EVENT and DECLARE_TRACE outside the include
 *  file ifdef protection.
 *  This is due to the way trace events work. If a file includes two
 *  trace event headers under one "CREATE_TRACE_POINTS" the first include
 *  will override the TRACE_EVENT and break the second include.
 */

#ifndef DECLARE_TRACE

#define TP_PROTO(args...)	args
#define TP_ARGS(args...)	args
#define TP_CONDITION(args...)	args

#ifdef CONFIG_TRACEPOINTS

/*
 * it_func[0] is never NULL because there is at least one element in the array
 * when the array itself is non NULL.
 *
 * Note, the proto and args passed in includes "__data" as the first parameter.
 * The reason for this is to handle the "void" prototype. If a tracepoint
 * has a "void" prototype, then it is invalid to declare a function
 * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just
 * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto".
 */
#define __DO_TRACE(tp, proto, args, cond, prercu, postrcu)		\
	do {								\
		struct tracepoint_func *it_func_ptr;			\
		void *it_func;						\
		void *__data;						\
									\
		if (!cpu_online(raw_smp_processor_id()))		\
			return;						\
									\
		if (!(cond))						\
			return;						\
		prercu;							\
		rcu_read_lock_sched_notrace();				\
		it_func_ptr = rcu_dereference_sched((tp)->funcs);	\
		if (it_func_ptr) {					\
			do {						\
				it_func = (it_func_ptr)->func;		\
				__data = (it_func_ptr)->data;		\
				((void(*)(proto))(it_func))(args);	\
			} while ((++it_func_ptr)->func);		\
		}							\
		rcu_read_unlock_sched_notrace();			\
		postrcu;						\
	} while (0)

#ifndef MODULE
#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)	\
	static inline void trace_##name##_rcuidle(proto)		\
	{								\
		if (static_key_false(&__tracepoint_##name.key))		\
			__DO_TRACE(&__tracepoint_##name,		\
				TP_PROTO(data_proto),			\
				TP_ARGS(data_args),			\
				TP_CONDITION(cond),			\
				rcu_irq_enter(),			\
				rcu_irq_exit());			\
	}
#else
#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)
#endif

/*
 * Make sure the alignment of the structure in the __tracepoints section will
 * not add unwanted padding between the beginning of the section and the
 * structure. Force alignment to the same alignment as the section start.
 */
#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
	extern struct tracepoint __tracepoint_##name;			\
	static inline void trace_##name(proto)				\
	{								\
		if (static_key_false(&__tracepoint_##name.key))		\
			__DO_TRACE(&__tracepoint_##name,		\
				TP_PROTO(data_proto),			\
				TP_ARGS(data_args),			\
				TP_CONDITION(cond),,);			\
	}								\
	__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args),		\
		PARAMS(cond), PARAMS(data_proto), PARAMS(data_args))	\
	static inline int						\
	register_trace_##name(void (*probe)(data_proto), void *data)	\
	{								\
		return tracepoint_probe_register(#name, (void *)probe,	\
						 data);			\
	}								\
	static inline int						\
	unregister_trace_##name(void (*probe)(data_proto), void *data)	\
	{								\
		return tracepoint_probe_unregister(#name, (void *)probe, \
						   data);		\
	}								\
	static inline void						\
	check_trace_callback_type_##name(void (*cb)(data_proto))	\
	{								\
	}

/*
 * We have no guarantee that gcc and the linker won't up-align the tracepoint
 * structures, so we create an array of pointers that will be used for iteration
 * on the tracepoints.
 */
#define DEFINE_TRACE_FN(name, reg, unreg)				 \
	static const char __tpstrtab_##name[]				 \
	__attribute__((section("__tracepoints_strings"))) = #name;	 \
	struct tracepoint __tracepoint_##name				 \
	__attribute__((section("__tracepoints"))) =			 \
		{ __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\
	static struct tracepoint * const __tracepoint_ptr_##name __used	 \
	__attribute__((section("__tracepoints_ptrs"))) =		 \
		&__tracepoint_##name;

#define DEFINE_TRACE(name)						\
	DEFINE_TRACE_FN(name, NULL, NULL);

#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)				\
	EXPORT_SYMBOL_GPL(__tracepoint_##name)
#define EXPORT_TRACEPOINT_SYMBOL(name)					\
	EXPORT_SYMBOL(__tracepoint_##name)

#else /* !CONFIG_TRACEPOINTS */
#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
	static inline void trace_##name(proto)				\
	{ }								\
	static inline void trace_##name##_rcuidle(proto)		\
	{ }								\
	static inline int						\
	register_trace_##name(void (*probe)(data_proto),		\
			      void *data)				\
	{								\
		return -ENOSYS;						\
	}								\
	static inline int						\
	unregister_trace_##name(void (*probe)(data_proto),		\
				void *data)				\
	{								\
		return -ENOSYS;						\
	}								\
	static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
	{								\
	}

#define DEFINE_TRACE_FN(name, reg, unreg)
#define DEFINE_TRACE(name)
#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
#define EXPORT_TRACEPOINT_SYMBOL(name)

#endif /* CONFIG_TRACEPOINTS */

/*
 * The need for the DECLARE_TRACE_NOARGS() is to handle the prototype
 * (void). "void" is a special value in a function prototype and can
 * not be combined with other arguments. Since the DECLARE_TRACE()
 * macro adds a data element at the beginning of the prototype,
 * we need a way to differentiate "(void *data, proto)" from
 * "(void *data, void)". The second prototype is invalid.
 *
 * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype
 * and "void *__data" as the callback prototype.
 *
 * DECLARE_TRACE() passes "proto" as the tracepoint protoype and
 * "void *__data, proto" as the callback prototype.
 */
#define DECLARE_TRACE_NOARGS(name)					\
		__DECLARE_TRACE(name, void, , 1, void *__data, __data)

#define DECLARE_TRACE(name, proto, args)				\
		__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), 1,	\
				PARAMS(void *__data, proto),		\
				PARAMS(__data, args))

#define DECLARE_TRACE_CONDITION(name, proto, args, cond)		\
	__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), PARAMS(cond), \
			PARAMS(void *__data, proto),			\
			PARAMS(__data, args))

#define TRACE_EVENT_FLAGS(event, flag)

#endif /* DECLARE_TRACE */

#ifndef TRACE_EVENT
/*
 * For use with the TRACE_EVENT macro:
 *
 * We define a tracepoint, its arguments, its printk format
 * and its 'fast binay record' layout.
 *
 * Firstly, name your tracepoint via TRACE_EVENT(name : the
 * 'subsystem_event' notation is fine.
 *
 * Think about this whole construct as the
 * 'trace_sched_switch() function' from now on.
 *
 *
 *  TRACE_EVENT(sched_switch,
 *
 *	*
 *	* A function has a regular function arguments
 *	* prototype, declare it via TP_PROTO():
 *	*
 *
 *	TP_PROTO(struct rq *rq, struct task_struct *prev,
 *		 struct task_struct *next),
 *
 *	*
 *	* Define the call signature of the 'function'.
 *	* (Design sidenote: we use this instead of a
 *	*  TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
 *	*
 *
 *	TP_ARGS(rq, prev, next),
 *
 *	*
 *	* Fast binary tracing: define the trace record via
 *	* TP_STRUCT__entry(). You can think about it like a
 *	* regular C structure local variable definition.
 *	*
 *	* This is how the trace record is structured and will
 *	* be saved into the ring buffer. These are the fields
 *	* that will be exposed to user-space in
 *	* /sys/kernel/debug/tracing/events/<*>/format.
 *	*
 *	* The declared 'local variable' is called '__entry'
 *	*
 *	* __field(pid_t, prev_prid) is equivalent to a standard declariton:
 *	*
 *	*	pid_t	prev_pid;
 *	*
 *	* __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
 *	*
 *	*	char	prev_comm[TASK_COMM_LEN];
 *	*
 *
 *	TP_STRUCT__entry(
 *		__array(	char,	prev_comm,	TASK_COMM_LEN	)
 *		__field(	pid_t,	prev_pid			)
 *		__field(	int,	prev_prio			)
 *		__array(	char,	next_comm,	TASK_COMM_LEN	)
 *		__field(	pid_t,	next_pid			)
 *		__field(	int,	next_prio			)
 *	),
 *
 *	*
 *	* Assign the entry into the trace record, by embedding
 *	* a full C statement block into TP_fast_assign(). You
 *	* can refer to the trace record as '__entry' -
 *	* otherwise you can put arbitrary C code in here.
 *	*
 *	* Note: this C code will execute every time a trace event
 *	* happens, on an active tracepoint.
 *	*
 *
 *	TP_fast_assign(
 *		memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
 *		__entry->prev_pid	= prev->pid;
 *		__entry->prev_prio	= prev->prio;
 *		memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
 *		__entry->next_pid	= next->pid;
 *		__entry->next_prio	= next->prio;
 *	),
 *
 *	*
 *	* Formatted output of a trace record via TP_printk().
 *	* This is how the tracepoint will appear under ftrace
 *	* plugins that make use of this tracepoint.
 *	*
 *	* (raw-binary tracing wont actually perform this step.)
 *	*
 *
 *	TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
 *		__entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
 *		__entry->next_comm, __entry->next_pid, __entry->next_prio),
 *
 * );
 *
 * This macro construct is thus used for the regular printk format
 * tracing setup, it is used to construct a function pointer based
 * tracepoint callback (this is used by programmatic plugins and
 * can also by used by generic instrumentation like SystemTap), and
 * it is also used to expose a structured trace record in
 * /sys/kernel/debug/tracing/events/.
 *
 * A set of (un)registration functions can be passed to the variant
 * TRACE_EVENT_FN to perform any (un)registration work.
 */

#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
#define DEFINE_EVENT(template, name, proto, args)		\
	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_CONDITION(template, name, proto,		\
			       args, cond)			\
	DECLARE_TRACE_CONDITION(name, PARAMS(proto),		\
				PARAMS(args), PARAMS(cond))

#define TRACE_EVENT(name, proto, args, struct, assign, print)	\
	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define TRACE_EVENT_FN(name, proto, args, struct,		\
		assign, print, reg, unreg)			\
	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define TRACE_EVENT_CONDITION(name, proto, args, cond,		\
			      struct, assign, print)		\
	DECLARE_TRACE_CONDITION(name, PARAMS(proto),		\
				PARAMS(args), PARAMS(cond))

#define TRACE_EVENT_FLAGS(event, flag)

#endif /* ifdef TRACE_EVENT (see note above) */
Commit	Line	Data
97e1c18e MD	1	#ifndef _LINUX_TRACEPOINT_H
	2	#define _LINUX_TRACEPOINT_H
	3
	4	/*
	5	* Kernel Tracepoint API.
	6	*
8cd09a59	7	* See Documentation/trace/tracepoints.txt.
97e1c18e MD	8	*
	9	* (C) Copyright 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
	10	*
	11	* Heavily inspired from the Linux Kernel Markers.
	12	*
	13	* This file is released under the GPLv2.
	14	* See the file COPYING for more details.
	15	*/
	16
c3e07084	17	#include <linux/smp.h>
b70e4f05	18	#include <linux/errno.h>
97e1c18e	19	#include <linux/types.h>
c3e07084 SRRH	20	#include <linux/percpu.h>
c3e07084 SRRH	21	#include <linux/cpumask.h>
97e1c18e	22	#include <linux/rcupdate.h>
c5905afb	23	#include <linux/static_key.h>
97e1c18e MD	24
	25	struct module;
	26	struct tracepoint;
	27
38516ab5 SR	28	struct tracepoint_func {
	29	void *func;
	30	void *data;
	31	};
	32
97e1c18e MD	33	struct tracepoint {
97e1c18e MD	34	const char name; / Tracepoint name */
c5905afb	35	struct static_key key;
97419875 JS	36	void (*regfunc)(void);
97419875 JS	37	void (*unregfunc)(void);
bd1c8b22	38	struct tracepoint_func __rcu *funcs;
65498646	39	};
97e1c18e	40
2e26ca71 SR	41	/*
	42	* Connect a probe to a tracepoint.
	43	* Internal API, should not be used directly.
	44	*/
38516ab5	45	extern int tracepoint_probe_register(const char name, void probe, void *data);
2e26ca71 SR	46
	47	/*
	48	* Disconnect a probe from a tracepoint.
	49	* Internal API, should not be used directly.
	50	*/
38516ab5 SR	51	extern int
38516ab5 SR	52	tracepoint_probe_unregister(const char name, void probe, void *data);
2e26ca71	53
38516ab5 SR	54	extern int tracepoint_probe_register_noupdate(const char name, void probe,
	55	void *data);
	56	extern int tracepoint_probe_unregister_noupdate(const char name, void probe,
	57	void *data);
2e26ca71 SR	58	extern void tracepoint_probe_update_all(void);
2e26ca71 SR	59
b75ef8b4 MD	60	#ifdef CONFIG_MODULES
	61	struct tp_module {
	62	struct list_head list;
	63	unsigned int num_tracepoints;
	64	struct tracepoint * const *tracepoints_ptrs;
	65	};
d6a6d1f3 SRRH	66	bool trace_module_has_bad_taint(struct module *mod);
	67	#else
	68	static inline bool trace_module_has_bad_taint(struct module *mod)
	69	{
	70	return false;
	71	}
b75ef8b4 MD	72	#endif /* CONFIG_MODULES */
b75ef8b4 MD	73
2e26ca71	74	struct tracepoint_iter {
b75ef8b4 MD	75	#ifdef CONFIG_MODULES
	76	struct tp_module *module;
	77	#endif /* CONFIG_MODULES */
65498646	78	struct tracepoint * const *tracepoint;
2e26ca71 SR	79	};
	80
	81	extern void tracepoint_iter_start(struct tracepoint_iter *iter);
	82	extern void tracepoint_iter_next(struct tracepoint_iter *iter);
	83	extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
	84	extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
2e26ca71 SR	85
	86	/*
	87	* tracepoint_synchronize_unregister must be called between the last tracepoint
	88	* probe unregistration and the end of module exit to make sure there is no
	89	* caller executing a probe when it is freed.
	90	*/
	91	static inline void tracepoint_synchronize_unregister(void)
	92	{
	93	synchronize_sched();
	94	}
	95
	96	#define PARAMS(args...) args
	97
2e26ca71 SR	98	#endif /* _LINUX_TRACEPOINT_H */
	99
	100	/*
	101	* Note: we keep the TRACE_EVENT and DECLARE_TRACE outside the include
	102	* file ifdef protection.
	103	* This is due to the way trace events work. If a file includes two
	104	* trace event headers under one "CREATE_TRACE_POINTS" the first include
	105	* will override the TRACE_EVENT and break the second include.
	106	*/
	107
ea20d929 SR	108	#ifndef DECLARE_TRACE
ea20d929 SR	109
2939b046	110	#define TP_PROTO(args...) args
8cd09a59	111	#define TP_ARGS(args...) args
287050d3	112	#define TP_CONDITION(args...) args
97e1c18e MD	113
	114	#ifdef CONFIG_TRACEPOINTS
	115
	116	/*
	117	* it_func[0] is never NULL because there is at least one element in the array
	118	* when the array itself is non NULL.
38516ab5 SR	119	*
	120	* Note, the proto and args passed in includes "__data" as the first parameter.
	121	* The reason for this is to handle the "void" prototype. If a tracepoint
	122	* has a "void" prototype, then it is invalid to declare a function
	123	* as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just
	124	* "void data", where as the DECLARE_TRACE() will pass in "void data, proto".
97e1c18e	125	*/
2fbb90db	126	#define __DO_TRACE(tp, proto, args, cond, prercu, postrcu) \
97e1c18e	127	do { \
38516ab5 SR	128	struct tracepoint_func *it_func_ptr; \
	129	void *it_func; \
	130	void *__data; \
c3e07084 SRRH	131	\
	132	if (!cpu_online(raw_smp_processor_id())) \
	133	return; \
97e1c18e	134	\
287050d3 SR	135	if (!(cond)) \
287050d3 SR	136	return; \
2fbb90db	137	prercu; \
da7b3eab	138	rcu_read_lock_sched_notrace(); \
38516ab5 SR	139	it_func_ptr = rcu_dereference_sched((tp)->funcs); \
38516ab5 SR	140	if (it_func_ptr) { \
97e1c18e	141	do { \
38516ab5 SR	142	it_func = (it_func_ptr)->func; \
	143	__data = (it_func_ptr)->data; \
	144	((void(*)(proto))(it_func))(args); \
	145	} while ((++it_func_ptr)->func); \
97e1c18e	146	} \
da7b3eab	147	rcu_read_unlock_sched_notrace(); \
2fbb90db	148	postrcu; \
97e1c18e MD	149	} while (0)
97e1c18e MD	150
7ece55a4 JT	151	#ifndef MODULE
	152	#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args) \
	153	static inline void trace_##name##_rcuidle(proto) \
	154	{ \
	155	if (static_key_false(&__tracepoint_##name.key)) \
	156	__DO_TRACE(&__tracepoint_##name, \
	157	TP_PROTO(data_proto), \
	158	TP_ARGS(data_args), \
	159	TP_CONDITION(cond), \
d6284099 PM	160	rcu_irq_enter(), \
d6284099 PM	161	rcu_irq_exit()); \
7ece55a4 JT	162	}
	163	#else
	164	#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args)
	165	#endif
	166
97e1c18e MD	167	/*
	168	* Make sure the alignment of the structure in the __tracepoints section will
	169	* not add unwanted padding between the beginning of the section and the
	170	* structure. Force alignment to the same alignment as the section start.
	171	*/
2fbb90db	172	#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
7e066fb8	173	extern struct tracepoint __tracepoint_##name; \
97e1c18e MD	174	static inline void trace_##name(proto) \
97e1c18e MD	175	{ \
c5905afb	176	if (static_key_false(&__tracepoint_##name.key)) \
97e1c18e	177	__DO_TRACE(&__tracepoint_##name, \
38516ab5	178	TP_PROTO(data_proto), \
287050d3	179	TP_ARGS(data_args), \
2fbb90db SR	180	TP_CONDITION(cond),,); \
2fbb90db SR	181	} \
7ece55a4 JT	182	__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args), \
7ece55a4 JT	183	PARAMS(cond), PARAMS(data_proto), PARAMS(data_args)) \
38516ab5 SR	184	static inline int \
38516ab5 SR	185	register_trace_##name(void (probe)(data_proto), void data) \
97e1c18e	186	{ \
38516ab5 SR	187	return tracepoint_probe_register(#name, (void *)probe, \
38516ab5 SR	188	data); \
97e1c18e	189	} \
38516ab5 SR	190	static inline int \
38516ab5 SR	191	unregister_trace_##name(void (probe)(data_proto), void data) \
97e1c18e	192	{ \
38516ab5 SR	193	return tracepoint_probe_unregister(#name, (void *)probe, \
38516ab5 SR	194	data); \
53da59aa	195	} \
38516ab5 SR	196	static inline void \
38516ab5 SR	197	check_trace_callback_type_##name(void (*cb)(data_proto)) \
53da59aa	198	{ \
97e1c18e MD	199	}
97e1c18e MD	200
65498646 MD	201	/*
	202	* We have no guarantee that gcc and the linker won't up-align the tracepoint
	203	* structures, so we create an array of pointers that will be used for iteration
	204	* on the tracepoints.
	205	*/
d430d3d7 JB	206	#define DEFINE_TRACE_FN(name, reg, unreg) \
	207	static const char __tpstrtab_##name[] \
	208	__attribute__((section("__tracepoints_strings"))) = #name; \
	209	struct tracepoint __tracepoint_##name \
	210	__attribute__((section("__tracepoints"))) = \
c5905afb	211	{ __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\
d430d3d7 JB	212	static struct tracepoint * const __tracepoint_ptr_##name __used \
d430d3d7 JB	213	__attribute__((section("__tracepoints_ptrs"))) = \
65498646	214	&__tracepoint_##name;
97419875 JS	215
	216	#define DEFINE_TRACE(name) \
	217	DEFINE_TRACE_FN(name, NULL, NULL);
7e066fb8 MD	218
	219	#define EXPORT_TRACEPOINT_SYMBOL_GPL(name) \
	220	EXPORT_SYMBOL_GPL(__tracepoint_##name)
	221	#define EXPORT_TRACEPOINT_SYMBOL(name) \
	222	EXPORT_SYMBOL(__tracepoint_##name)
	223
97e1c18e	224	#else /* !CONFIG_TRACEPOINTS */
2fbb90db	225	#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
97e1c18e MD	226	static inline void trace_##name(proto) \
97e1c18e MD	227	{ } \
2fbb90db SR	228	static inline void trace_##name##_rcuidle(proto) \
2fbb90db SR	229	{ } \
38516ab5 SR	230	static inline int \
	231	register_trace_##name(void (*probe)(data_proto), \
	232	void *data) \
97e1c18e MD	233	{ \
	234	return -ENOSYS; \
	235	} \
38516ab5 SR	236	static inline int \
	237	unregister_trace_##name(void (*probe)(data_proto), \
	238	void *data) \
c420970e MD	239	{ \
c420970e MD	240	return -ENOSYS; \
53da59aa	241	} \
38516ab5	242	static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \
53da59aa	243	{ \
c420970e	244	}
97e1c18e	245
97419875	246	#define DEFINE_TRACE_FN(name, reg, unreg)
7e066fb8 MD	247	#define DEFINE_TRACE(name)
	248	#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
	249	#define EXPORT_TRACEPOINT_SYMBOL(name)
	250
97e1c18e	251	#endif /* CONFIG_TRACEPOINTS */
38516ab5 SR	252
	253	/*
	254	* The need for the DECLARE_TRACE_NOARGS() is to handle the prototype
	255	* (void). "void" is a special value in a function prototype and can
	256	* not be combined with other arguments. Since the DECLARE_TRACE()
	257	* macro adds a data element at the beginning of the prototype,
	258	* we need a way to differentiate "(void *data, proto)" from
	259	* "(void *data, void)". The second prototype is invalid.
	260	*
	261	* DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype
	262	* and "void *__data" as the callback prototype.
	263	*
	264	* DECLARE_TRACE() passes "proto" as the tracepoint protoype and
	265	* "void *__data, proto" as the callback prototype.
	266	*/
	267	#define DECLARE_TRACE_NOARGS(name) \
287050d3	268	__DECLARE_TRACE(name, void, , 1, void *__data, __data)
38516ab5 SR	269
38516ab5 SR	270	#define DECLARE_TRACE(name, proto, args) \
287050d3	271	__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), 1, \
38516ab5 SR	272	PARAMS(void *__data, proto), \
	273	PARAMS(__data, args))
	274
287050d3 SR	275	#define DECLARE_TRACE_CONDITION(name, proto, args, cond) \
	276	__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), PARAMS(cond), \
	277	PARAMS(void *__data, proto), \
	278	PARAMS(__data, args))
	279
1ed0c597 FW	280	#define TRACE_EVENT_FLAGS(event, flag)
1ed0c597 FW	281
ea20d929	282	#endif /* DECLARE_TRACE */
97e1c18e	283
ea20d929	284	#ifndef TRACE_EVENT
823f9124 SR	285	/*
	286	* For use with the TRACE_EVENT macro:
	287	*
	288	* We define a tracepoint, its arguments, its printk format
	289	* and its 'fast binay record' layout.
	290	*
	291	* Firstly, name your tracepoint via TRACE_EVENT(name : the
	292	* 'subsystem_event' notation is fine.
	293	*
	294	* Think about this whole construct as the
	295	* 'trace_sched_switch() function' from now on.
	296	*
	297	*
	298	* TRACE_EVENT(sched_switch,
	299	*
	300	* *
	301	* * A function has a regular function arguments
	302	* * prototype, declare it via TP_PROTO():
	303	* *
	304	*
ef18012b SR	305	* TP_PROTO(struct rq rq, struct task_struct prev,
ef18012b SR	306	* struct task_struct *next),
823f9124 SR	307	*
	308	* *
	309	* * Define the call signature of the 'function'.
	310	* * (Design sidenote: we use this instead of a
	311	* * TP_PROTO1/TP_PROTO2/TP_PROTO3 ugliness.)
	312	* *
	313	*
ef18012b	314	* TP_ARGS(rq, prev, next),
823f9124 SR	315	*
	316	* *
	317	* * Fast binary tracing: define the trace record via
	318	* * TP_STRUCT__entry(). You can think about it like a
	319	* * regular C structure local variable definition.
	320	* *
	321	* * This is how the trace record is structured and will
	322	* * be saved into the ring buffer. These are the fields
	323	* * that will be exposed to user-space in
156f5a78	324	* * /sys/kernel/debug/tracing/events/<*>/format.
823f9124 SR	325	* *
	326	* * The declared 'local variable' is called '__entry'
	327	* *
	328	* * __field(pid_t, prev_prid) is equivalent to a standard declariton:
	329	* *
	330	* * pid_t prev_pid;
	331	* *
	332	* * __array(char, prev_comm, TASK_COMM_LEN) is equivalent to:
	333	* *
	334	* * char prev_comm[TASK_COMM_LEN];
	335	* *
	336	*
	337	* TP_STRUCT__entry(
	338	* __array( char, prev_comm, TASK_COMM_LEN )
	339	* __field( pid_t, prev_pid )
	340	* __field( int, prev_prio )
	341	* __array( char, next_comm, TASK_COMM_LEN )
	342	* __field( pid_t, next_pid )
	343	* __field( int, next_prio )
	344	* ),
	345	*
	346	* *
	347	* * Assign the entry into the trace record, by embedding
	348	* * a full C statement block into TP_fast_assign(). You
	349	* * can refer to the trace record as '__entry' -
	350	* * otherwise you can put arbitrary C code in here.
	351	* *
	352	* * Note: this C code will execute every time a trace event
	353	* * happens, on an active tracepoint.
	354	* *
	355	*
ef18012b SR	356	* TP_fast_assign(
	357	* memcpy(__entry->next_comm, next->comm, TASK_COMM_LEN);
	358	* __entry->prev_pid = prev->pid;
	359	* __entry->prev_prio = prev->prio;
823f9124 SR	360	* memcpy(__entry->prev_comm, prev->comm, TASK_COMM_LEN);
823f9124 SR	361	* __entry->next_pid = next->pid;
ef18012b	362	* __entry->next_prio = next->prio;
ec6e7c3a	363	* ),
823f9124 SR	364	*
	365	* *
	366	* * Formatted output of a trace record via TP_printk().
	367	* * This is how the tracepoint will appear under ftrace
	368	* * plugins that make use of this tracepoint.
	369	* *
	370	* * (raw-binary tracing wont actually perform this step.)
	371	* *
	372	*
	373	* TP_printk("task %s:%d [%d] ==> %s:%d [%d]",
	374	* __entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
	375	* __entry->next_comm, __entry->next_pid, __entry->next_prio),
	376	*
	377	* );
	378	*
	379	* This macro construct is thus used for the regular printk format
	380	* tracing setup, it is used to construct a function pointer based
	381	* tracepoint callback (this is used by programmatic plugins and
	382	* can also by used by generic instrumentation like SystemTap), and
	383	* it is also used to expose a structured trace record in
156f5a78	384	* /sys/kernel/debug/tracing/events/.
97419875 JS	385	*
	386	* A set of (un)registration functions can be passed to the variant
	387	* TRACE_EVENT_FN to perform any (un)registration work.
823f9124 SR	388	*/
823f9124 SR	389
091ad365	390	#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
ff038f5c SR	391	#define DEFINE_EVENT(template, name, proto, args) \
ff038f5c SR	392	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
e5bc9721 SR	393	#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
e5bc9721 SR	394	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
287050d3 SR	395	#define DEFINE_EVENT_CONDITION(template, name, proto, \
	396	args, cond) \
	397	DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
	398	PARAMS(args), PARAMS(cond))
ff038f5c	399
30a8fecc	400	#define TRACE_EVENT(name, proto, args, struct, assign, print) \
da4d0302	401	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
97419875 JS	402	#define TRACE_EVENT_FN(name, proto, args, struct, \
	403	assign, print, reg, unreg) \
	404	DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
287050d3 SR	405	#define TRACE_EVENT_CONDITION(name, proto, args, cond, \
	406	struct, assign, print) \
	407	DECLARE_TRACE_CONDITION(name, PARAMS(proto), \
	408	PARAMS(args), PARAMS(cond))
7cb2e3ee	409
1ed0c597 FW	410	#define TRACE_EVENT_FLAGS(event, flag)
1ed0c597 FW	411
7cb2e3ee	412	#endif /* ifdef TRACE_EVENT (see note above) */