[lttng-ust.git] / libmarkers / marker.h

#ifndef _LINUX_MARKER_H
#define _LINUX_MARKER_H

/*
 * Code markup for dynamic and static tracing.
 *
 * See Documentation/marker.txt.
 *
 * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
 * (C) Copyright 2009 Pierre-Marc Fournier <pierre-marc dot fournier at polymtl dot ca>
 *
 * This file is released under the GPLv2.
 * See the file COPYING for more details.
 */

#include <stdarg.h>
//ust// #include <linux/types.h>
#include "immediate.h"
//ust// #include <linux/ltt-channels.h>
#include "kernelcompat.h"
#include "compiler.h"
#include "list.h"

//ust// struct module;
//ust// struct task_struct;
struct marker;

/**
 * marker_probe_func - Type of a marker probe function
 * @mdata: marker data
 * @probe_private: probe private data
 * @call_private: call site private data
 * @fmt: format string
 * @args: variable argument list pointer. Use a pointer to overcome C's
 *        inability to pass this around as a pointer in a portable manner in
 *        the callee otherwise.
 *
 * Type of marker probe functions. They receive the mdata and need to parse the
 * format string to recover the variable argument list.
 */
typedef void marker_probe_func(const struct marker *mdata,
		void *probe_private, void *call_private,
		const char *fmt, va_list *args);

struct marker_probe_closure {
	marker_probe_func *func;	/* Callback */
	void *probe_private;		/* Private probe data */
};

struct marker {
	const char *channel;	/* Name of channel where to send data */
	const char *name;	/* Marker name */
	const char *format;	/* Marker format string, describing the
				 * variable argument list.
				 */
 	DEFINE_IMV(char, state);/* Immediate value state. */
	char ptype;		/* probe type : 0 : single, 1 : multi */
				/* Probe wrapper */
	u16 channel_id;		/* Numeric channel identifier, dynamic */
	u16 event_id;		/* Numeric event identifier, dynamic */
	void (*call)(const struct marker *mdata, void *call_private, ...);
	struct marker_probe_closure single;
	struct marker_probe_closure *multi;
	const char *tp_name;	/* Optional tracepoint name */
	void *tp_cb;		/* Optional tracepoint callback */
} __attribute__((aligned(8)));

//ust// #ifdef CONFIG_MARKERS

#define _DEFINE_MARKER(channel, name, tp_name_str, tp_cb, format)	\
		static const char __mstrtab_##channel##_##name[]	\
		__attribute__((section("__markers_strings")))		\
		= #channel "\0" #name "\0" format;			\
		static struct marker __mark_##channel##_##name		\
		__attribute__((section("__markers"), aligned(8))) =	\
		{ __mstrtab_##channel##_##name,				\
		  &__mstrtab_##channel##_##name[sizeof(#channel)],	\
		  &__mstrtab_##channel##_##name[sizeof(#channel) +	\
						sizeof(#name)],		\
		  0, 0, 0, 0, marker_probe_cb,				\
		  { __mark_empty_function, NULL},			\
		  NULL, tp_name_str, tp_cb }

#define DEFINE_MARKER(channel, name, format)				\
		_DEFINE_MARKER(channel, name, NULL, NULL, format)

#define DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format)		\
		_DEFINE_MARKER(channel, name, #tp_name, tp_cb, format)

/*
 * Make sure the alignment of the structure in the __markers 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.
 *
 * The "generic" argument controls which marker enabling mechanism must be used.
 * If generic is true, a variable read is used.
 * If generic is false, immediate values are used.
 */
#define __trace_mark(generic, channel, name, call_private, format, args...) \
	do {								\
		DEFINE_MARKER(channel, name, format);			\
		__mark_check_format(format, ## args);			\
		if (!generic) {						\
			if (unlikely(imv_read(				\
					__mark_##channel##_##name.state))) \
				(*__mark_##channel##_##name.call)	\
					(&__mark_##channel##_##name,	\
					call_private, ## args);		\
		} else {						\
			if (unlikely(_imv_read(				\
					__mark_##channel##_##name.state))) \
				(*__mark_##channel##_##name.call)	\
					(&__mark_##channel##_##name,	\
					call_private, ## args);		\
		}							\
	} while (0)

#define __trace_mark_tp(channel, name, call_private, tp_name, tp_cb,	\
			format, args...)				\
	do {								\
		void __check_tp_type(void)				\
		{							\
			register_trace_##tp_name(tp_cb);		\
		}							\
		DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format);\
		__mark_check_format(format, ## args);			\
		(*__mark_##channel##_##name.call)(&__mark_##channel##_##name, \
			call_private, ## args);				\
	} while (0)

extern void marker_update_probe_range(struct marker *begin,
	struct marker *end);

#define GET_MARKER(channel, name)	(__mark_##channel##_##name)

//ust// #else /* !CONFIG_MARKERS */
//ust// #define DEFINE_MARKER(channel, name, tp_name, tp_cb, format)
//ust// #define __trace_mark(generic, channel, name, call_private, format, args...) \
//ust// 		__mark_check_format(format, ## args)
//ust// #define __trace_mark_tp(channel, name, call_private, tp_name, tp_cb,	\
//ust// 		format, args...)					\
//ust// 	do {								\
//ust// 		void __check_tp_type(void)				\
//ust// 		{							\
//ust// 			register_trace_##tp_name(tp_cb);		\
//ust// 		}							\
//ust// 		__mark_check_format(format, ## args);			\
//ust// 	} while (0)
//ust// static inline void marker_update_probe_range(struct marker *begin,
//ust// 	struct marker *end)
//ust// { }
//ust// #define GET_MARKER(channel, name)
//ust// #endif /* CONFIG_MARKERS */

/**
 * trace_mark - Marker using code patching
 * @channel: marker channel (where to send the data), not quoted.
 * @name: marker name, not quoted.
 * @format: format string
 * @args...: variable argument list
 *
 * Places a marker using optimized code patching technique (imv_read())
 * to be enabled when immediate values are present.
 */
#define trace_mark(channel, name, format, args...) \
	__trace_mark(0, channel, name, NULL, format, ## args)

/**
 * _trace_mark - Marker using variable read
 * @channel: marker channel (where to send the data), not quoted.
 * @name: marker name, not quoted.
 * @format: format string
 * @args...: variable argument list
 *
 * Places a marker using a standard memory read (_imv_read()) to be
 * enabled. Should be used for markers in code paths where instruction
 * modification based enabling is not welcome. (__init and __exit functions,
 * lockdep, some traps, printk).
 */
#define _trace_mark(channel, name, format, args...) \
	__trace_mark(1, channel, name, NULL, format, ## args)

/**
 * trace_mark_tp - Marker in a tracepoint callback
 * @channel: marker channel (where to send the data), not quoted.
 * @name: marker name, not quoted.
 * @tp_name: tracepoint name, not quoted.
 * @tp_cb: tracepoint callback. Should have an associated global symbol so it
 *         is not optimized away by the compiler (should not be static).
 * @format: format string
 * @args...: variable argument list
 *
 * Places a marker in a tracepoint callback.
 */
#define trace_mark_tp(channel, name, tp_name, tp_cb, format, args...)	\
	__trace_mark_tp(channel, name, NULL, tp_name, tp_cb, format, ## args)

/**
 * MARK_NOARGS - Format string for a marker with no argument.
 */
#define MARK_NOARGS " "

extern void lock_markers(void);
extern void unlock_markers(void);

extern void markers_compact_event_ids(void);

/* To be used for string format validity checking with gcc */
static inline void __printf(1, 2) ___mark_check_format(const char *fmt, ...)
{
}

#define __mark_check_format(format, args...)				\
	do {								\
		if (0)							\
			___mark_check_format(format, ## args);		\
	} while (0)

extern marker_probe_func __mark_empty_function;

extern void marker_probe_cb(const struct marker *mdata,
	void *call_private, ...);

/*
 * Connect a probe to a marker.
 * private data pointer must be a valid allocated memory address, or NULL.
 */
extern int marker_probe_register(const char *channel, const char *name,
	const char *format, marker_probe_func *probe, void *probe_private);

/*
 * Returns the private data given to marker_probe_register.
 */
extern int marker_probe_unregister(const char *channel, const char *name,
	marker_probe_func *probe, void *probe_private);
/*
 * Unregister a marker by providing the registered private data.
 */
extern int marker_probe_unregister_private_data(marker_probe_func *probe,
	void *probe_private);

extern void *marker_get_private_data(const char *channel, const char *name,
	marker_probe_func *probe, int num);

/*
 * marker_synchronize_unregister must be called between the last marker probe
 * unregistration and the first one of
 * - the end of module exit function
 * - the free of any resource used by the probes
 * to ensure the code and data are valid for any possibly running probes.
 */
#define marker_synchronize_unregister() synchronize_sched()

struct marker_iter {
//ust//	struct module *module;
	struct lib *lib;
	struct marker *marker;
};

extern void marker_iter_start(struct marker_iter *iter);
extern void marker_iter_next(struct marker_iter *iter);
extern void marker_iter_stop(struct marker_iter *iter);
extern void marker_iter_reset(struct marker_iter *iter);
extern int marker_get_iter_range(struct marker **marker, struct marker *begin,
	struct marker *end);

extern void marker_update_process(void);
extern int is_marker_enabled(const char *channel, const char *name);

//ust// #ifdef CONFIG_MARKERS_USERSPACE
//ust// extern void exit_user_markers(struct task_struct *p);
//ust// #else
//ust// static inline void exit_user_markers(struct task_struct *p)
//ust// {
//ust// }
//ust// #endif


struct lib {
	struct marker *markers_start;
	int markers_count;
	struct list_head list;
};

int marker_register_lib(struct marker *markers_start, int markers_count);

#define MARKER_LIB									\
extern struct marker __start___markers[] __attribute__((visibility("hidden")));		\
extern struct marker __stop___markers[] __attribute__((visibility("hidden")));		\
											\
static void __attribute__((constructor)) __markers__init(void) 				\
{											\
	marker_register_lib(__start___markers, (((long)__stop___markers)-((long)__start___markers))/sizeof(struct marker));\
}

#endif
Commit	Line	Data
	1	#ifndef _LINUX_MARKER_H
	2	#define _LINUX_MARKER_H
	3
	4	/*
	5	* Code markup for dynamic and static tracing.
	6	*
	7	* See Documentation/marker.txt.
	8	*
	9	* (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
	10	* (C) Copyright 2009 Pierre-Marc Fournier <pierre-marc dot fournier at polymtl dot ca>
	11	*
	12	* This file is released under the GPLv2.
	13	* See the file COPYING for more details.
	14	*/
	15
	16	#include <stdarg.h>
	17	//ust// #include <linux/types.h>
	18	#include "immediate.h"
	19	//ust// #include <linux/ltt-channels.h>
	20	#include "kernelcompat.h"
	21	#include "compiler.h"
	22	#include "list.h"
	23
	24	//ust// struct module;
	25	//ust// struct task_struct;
	26	struct marker;
	27
	28	/**
	29	* marker_probe_func - Type of a marker probe function
	30	* @mdata: marker data
	31	* @probe_private: probe private data
	32	* @call_private: call site private data
	33	* @fmt: format string
	34	* @args: variable argument list pointer. Use a pointer to overcome C's
	35	* inability to pass this around as a pointer in a portable manner in
	36	* the callee otherwise.
	37	*
	38	* Type of marker probe functions. They receive the mdata and need to parse the
	39	* format string to recover the variable argument list.
	40	*/
	41	typedef void marker_probe_func(const struct marker *mdata,
	42	void probe_private, void call_private,
	43	const char fmt, va_list args);
	44
	45	struct marker_probe_closure {
	46	marker_probe_func func; / Callback */
	47	void probe_private; / Private probe data */
	48	};
	49
	50	struct marker {
	51	const char channel; / Name of channel where to send data */
	52	const char name; / Marker name */
	53	const char format; / Marker format string, describing the
	54	* variable argument list.
	55	*/
	56	DEFINE_IMV(char, state);/* Immediate value state. */
	57	char ptype; /* probe type : 0 : single, 1 : multi */
	58	/* Probe wrapper */
	59	u16 channel_id; /* Numeric channel identifier, dynamic */
	60	u16 event_id; /* Numeric event identifier, dynamic */
	61	void (call)(const struct marker mdata, void *call_private, ...);
	62	struct marker_probe_closure single;
	63	struct marker_probe_closure *multi;
	64	const char tp_name; / Optional tracepoint name */
	65	void tp_cb; / Optional tracepoint callback */
	66	} __attribute__((aligned(8)));
	67
	68	//ust// #ifdef CONFIG_MARKERS
	69
	70	#define _DEFINE_MARKER(channel, name, tp_name_str, tp_cb, format) \
	71	static const char __mstrtab_##channel##_##name[] \
	72	__attribute__((section("__markers_strings"))) \
	73	= #channel "\0" #name "\0" format; \
	74	static struct marker __mark_##channel##_##name \
	75	__attribute__((section("__markers"), aligned(8))) = \
	76	{ __mstrtab_##channel##_##name, \
	77	&__mstrtab_##channel##_##name[sizeof(#channel)], \
	78	&__mstrtab_##channel##_##name[sizeof(#channel) + \
	79	sizeof(#name)], \
	80	0, 0, 0, 0, marker_probe_cb, \
	81	{ __mark_empty_function, NULL}, \
	82	NULL, tp_name_str, tp_cb }
	83
	84	#define DEFINE_MARKER(channel, name, format) \
	85	_DEFINE_MARKER(channel, name, NULL, NULL, format)
	86
	87	#define DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format) \
	88	_DEFINE_MARKER(channel, name, #tp_name, tp_cb, format)
	89
	90	/*
	91	* Make sure the alignment of the structure in the __markers section will
	92	* not add unwanted padding between the beginning of the section and the
	93	* structure. Force alignment to the same alignment as the section start.
	94	*
	95	* The "generic" argument controls which marker enabling mechanism must be used.
	96	* If generic is true, a variable read is used.
	97	* If generic is false, immediate values are used.
	98	*/
	99	#define __trace_mark(generic, channel, name, call_private, format, args...) \
	100	do { \
	101	DEFINE_MARKER(channel, name, format); \
	102	__mark_check_format(format, ## args); \
	103	if (!generic) { \
	104	if (unlikely(imv_read( \
	105	__mark_##channel##_##name.state))) \
	106	(*__mark_##channel##_##name.call) \
	107	(&__mark_##channel##_##name, \
	108	call_private, ## args); \
	109	} else { \
	110	if (unlikely(_imv_read( \
	111	__mark_##channel##_##name.state))) \
	112	(*__mark_##channel##_##name.call) \
	113	(&__mark_##channel##_##name, \
	114	call_private, ## args); \
	115	} \
	116	} while (0)
	117
	118	#define __trace_mark_tp(channel, name, call_private, tp_name, tp_cb, \
	119	format, args...) \
	120	do { \
	121	void __check_tp_type(void) \
	122	{ \
	123	register_trace_##tp_name(tp_cb); \
	124	} \
	125	DEFINE_MARKER_TP(channel, name, tp_name, tp_cb, format);\
	126	__mark_check_format(format, ## args); \
	127	(*__mark_##channel##_##name.call)(&__mark_##channel##_##name, \
	128	call_private, ## args); \
	129	} while (0)
	130
	131	extern void marker_update_probe_range(struct marker *begin,
	132	struct marker *end);
	133
	134	#define GET_MARKER(channel, name) (__mark_##channel##_##name)
	135
	136	//ust// #else /* !CONFIG_MARKERS */
	137	//ust// #define DEFINE_MARKER(channel, name, tp_name, tp_cb, format)
	138	//ust// #define __trace_mark(generic, channel, name, call_private, format, args...) \
	139	//ust// __mark_check_format(format, ## args)
	140	//ust// #define __trace_mark_tp(channel, name, call_private, tp_name, tp_cb, \
	141	//ust// format, args...) \
	142	//ust// do { \
	143	//ust// void __check_tp_type(void) \
	144	//ust// { \
	145	//ust// register_trace_##tp_name(tp_cb); \
	146	//ust// } \
	147	//ust// __mark_check_format(format, ## args); \
	148	//ust// } while (0)
	149	//ust// static inline void marker_update_probe_range(struct marker *begin,
	150	//ust// struct marker *end)
	151	//ust// { }
	152	//ust// #define GET_MARKER(channel, name)
	153	//ust// #endif /* CONFIG_MARKERS */
	154
	155	/**
	156	* trace_mark - Marker using code patching
	157	* @channel: marker channel (where to send the data), not quoted.
	158	* @name: marker name, not quoted.
	159	* @format: format string
	160	* @args...: variable argument list
	161	*
	162	* Places a marker using optimized code patching technique (imv_read())
	163	* to be enabled when immediate values are present.
	164	*/
	165	#define trace_mark(channel, name, format, args...) \
	166	__trace_mark(0, channel, name, NULL, format, ## args)
	167
	168	/**
	169	* _trace_mark - Marker using variable read
	170	* @channel: marker channel (where to send the data), not quoted.
	171	* @name: marker name, not quoted.
	172	* @format: format string
	173	* @args...: variable argument list
	174	*
	175	* Places a marker using a standard memory read (_imv_read()) to be
	176	* enabled. Should be used for markers in code paths where instruction
	177	* modification based enabling is not welcome. (__init and __exit functions,
	178	* lockdep, some traps, printk).
	179	*/
	180	#define _trace_mark(channel, name, format, args...) \
	181	__trace_mark(1, channel, name, NULL, format, ## args)
	182
	183	/**
	184	* trace_mark_tp - Marker in a tracepoint callback
	185	* @channel: marker channel (where to send the data), not quoted.
	186	* @name: marker name, not quoted.
	187	* @tp_name: tracepoint name, not quoted.
	188	* @tp_cb: tracepoint callback. Should have an associated global symbol so it
	189	* is not optimized away by the compiler (should not be static).
	190	* @format: format string
	191	* @args...: variable argument list
	192	*
	193	* Places a marker in a tracepoint callback.
	194	*/
	195	#define trace_mark_tp(channel, name, tp_name, tp_cb, format, args...) \
	196	__trace_mark_tp(channel, name, NULL, tp_name, tp_cb, format, ## args)
	197
	198	/**
	199	* MARK_NOARGS - Format string for a marker with no argument.
	200	*/
	201	#define MARK_NOARGS " "
	202
	203	extern void lock_markers(void);
	204	extern void unlock_markers(void);
	205
	206	extern void markers_compact_event_ids(void);
	207
	208	/* To be used for string format validity checking with gcc */
	209	static inline void __printf(1, 2) ___mark_check_format(const char *fmt, ...)
	210	{
	211	}
	212
	213	#define __mark_check_format(format, args...) \
	214	do { \
	215	if (0) \
	216	___mark_check_format(format, ## args); \
	217	} while (0)
	218
	219	extern marker_probe_func __mark_empty_function;
	220
	221	extern void marker_probe_cb(const struct marker *mdata,
	222	void *call_private, ...);
	223
	224	/*
	225	* Connect a probe to a marker.
	226	* private data pointer must be a valid allocated memory address, or NULL.
	227	*/
	228	extern int marker_probe_register(const char channel, const char name,
	229	const char format, marker_probe_func probe, void *probe_private);
	230
	231	/*
	232	* Returns the private data given to marker_probe_register.
	233	*/
	234	extern int marker_probe_unregister(const char channel, const char name,
	235	marker_probe_func probe, void probe_private);
	236	/*
	237	* Unregister a marker by providing the registered private data.
	238	*/
	239	extern int marker_probe_unregister_private_data(marker_probe_func *probe,
	240	void *probe_private);
	241
	242	extern void marker_get_private_data(const char channel, const char *name,
	243	marker_probe_func *probe, int num);
	244
	245	/*
	246	* marker_synchronize_unregister must be called between the last marker probe
	247	* unregistration and the first one of
	248	* - the end of module exit function
	249	* - the free of any resource used by the probes
	250	* to ensure the code and data are valid for any possibly running probes.
	251	*/
	252	#define marker_synchronize_unregister() synchronize_sched()
	253
	254	struct marker_iter {
	255	//ust// struct module *module;
	256	struct lib *lib;
	257	struct marker *marker;
	258	};
	259
	260	extern void marker_iter_start(struct marker_iter *iter);
	261	extern void marker_iter_next(struct marker_iter *iter);
	262	extern void marker_iter_stop(struct marker_iter *iter);
	263	extern void marker_iter_reset(struct marker_iter *iter);
	264	extern int marker_get_iter_range(struct marker *marker, struct marker begin,
	265	struct marker *end);
	266
	267	extern void marker_update_process(void);
	268	extern int is_marker_enabled(const char channel, const char name);
	269
	270	//ust// #ifdef CONFIG_MARKERS_USERSPACE
	271	//ust// extern void exit_user_markers(struct task_struct *p);
	272	//ust// #else
	273	//ust// static inline void exit_user_markers(struct task_struct *p)
	274	//ust// {
	275	//ust// }
	276	//ust// #endif
	277
	278
	279	struct lib {
	280	struct marker *markers_start;
	281	int markers_count;
	282	struct list_head list;
	283	};
	284
	285	int marker_register_lib(struct marker *markers_start, int markers_count);
	286
	287	#define MARKER_LIB \
	288	extern struct marker __start___markers[] __attribute__((visibility("hidden"))); \
	289	extern struct marker __stop___markers[] __attribute__((visibility("hidden"))); \
	290	\
	291	static void __attribute__((constructor)) __markers__init(void) \
	292	{ \
	293	marker_register_lib(__start___markers, (((long)__stop___markers)-((long)__start___markers))/sizeof(struct marker));\
	294	}
	295
	296	#endif