[lttng-modules.git] / wrapper / ftrace.h

#ifndef _LTTNG_WRAPPER_FTRACE_H
#define _LTTNG_WRAPPER_FTRACE_H

/*
 * wrapper/ftrace.h
 *
 * wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
 * available, else we need to have a kernel that exports this function to GPL
 * modules.
 *
 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; only
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <linux/ftrace.h>
#include <linux/version.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
#include <../kernel/trace/trace.h>
#endif

#ifdef CONFIG_KALLSYMS

#include <linux/kallsyms.h>
#include <wrapper/kallsyms.h>

static inline
int wrapper_register_ftrace_function_probe(char *glob,
		struct ftrace_probe_ops *ops, void *data)
{
	int (*register_ftrace_function_probe_sym)(char *glob,
			struct ftrace_probe_ops *ops, void *data);

	register_ftrace_function_probe_sym = (void *) kallsyms_lookup_funcptr("register_ftrace_function_probe");
	if (register_ftrace_function_probe_sym) {
		return register_ftrace_function_probe_sym(glob, ops, data);
	} else {
		printk_once(KERN_WARNING "LTTng: register_ftrace_function_probe symbol lookup failed.\n");
		return -EINVAL;
	}
}

static inline
void wrapper_unregister_ftrace_function_probe(char *glob,
		struct ftrace_probe_ops *ops, void *data)
{
	void (*unregister_ftrace_function_probe_sym)(char *glob,
			struct ftrace_probe_ops *ops, void *data);

	unregister_ftrace_function_probe_sym = (void *) kallsyms_lookup_funcptr("unregister_ftrace_function_probe");
	if (unregister_ftrace_function_probe_sym) {
		unregister_ftrace_function_probe_sym(glob, ops, data);
	} else {
		printk_once(KERN_WARNING "LTTng: unregister_ftrace_function_probe symbol lookup failed.\n");
		WARN_ON(1);
	}
}

#else

static inline
int wrapper_register_ftrace_function_probe(char *glob,
		struct ftrace_probe_ops *ops, void *data)
{
	return register_ftrace_function_probe(glob, ops, data);
}

static inline
void wrapper_unregister_ftrace_function_probe(char *glob,
		struct ftrace_probe_ops *ops, void *data)
{
	return unregister_ftrace_function_probe(glob, ops, data);
}
#endif

#endif /* _LTTNG_WRAPPER_FTRACE_H */
Commit	Line	Data
	1	#ifndef _LTTNG_WRAPPER_FTRACE_H
	2	#define _LTTNG_WRAPPER_FTRACE_H
	3
	4	/*
	5	* wrapper/ftrace.h
	6	*
	7	* wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
	8	* available, else we need to have a kernel that exports this function to GPL
	9	* modules.
	10	*
	11	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	12	*
	13	* This library is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU Lesser General Public
	15	* License as published by the Free Software Foundation; only
	16	* version 2.1 of the License.
	17	*
	18	* This library is distributed in the hope that it will be useful,
	19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	21	* Lesser General Public License for more details.
	22	*
	23	* You should have received a copy of the GNU Lesser General Public
	24	* License along with this library; if not, write to the Free Software
	25	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	26	*/
	27
	28	#include <linux/ftrace.h>
	29	#include <linux/version.h>
	30	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
	31	#include <../kernel/trace/trace.h>
	32	#endif
	33
	34	#ifdef CONFIG_KALLSYMS
	35
	36	#include <linux/kallsyms.h>
	37	#include <wrapper/kallsyms.h>
	38
	39	static inline
	40	int wrapper_register_ftrace_function_probe(char *glob,
	41	struct ftrace_probe_ops ops, void data)
	42	{
	43	int (register_ftrace_function_probe_sym)(char glob,
	44	struct ftrace_probe_ops ops, void data);
	45
	46	register_ftrace_function_probe_sym = (void *) kallsyms_lookup_funcptr("register_ftrace_function_probe");
	47	if (register_ftrace_function_probe_sym) {
	48	return register_ftrace_function_probe_sym(glob, ops, data);
	49	} else {
	50	printk_once(KERN_WARNING "LTTng: register_ftrace_function_probe symbol lookup failed.\n");
	51	return -EINVAL;
	52	}
	53	}
	54
	55	static inline
	56	void wrapper_unregister_ftrace_function_probe(char *glob,
	57	struct ftrace_probe_ops ops, void data)
	58	{
	59	void (unregister_ftrace_function_probe_sym)(char glob,
	60	struct ftrace_probe_ops ops, void data);
	61
	62	unregister_ftrace_function_probe_sym = (void *) kallsyms_lookup_funcptr("unregister_ftrace_function_probe");
	63	if (unregister_ftrace_function_probe_sym) {
	64	unregister_ftrace_function_probe_sym(glob, ops, data);
	65	} else {
	66	printk_once(KERN_WARNING "LTTng: unregister_ftrace_function_probe symbol lookup failed.\n");
	67	WARN_ON(1);
	68	}
	69	}
	70
	71	#else
	72
	73	static inline
	74	int wrapper_register_ftrace_function_probe(char *glob,
	75	struct ftrace_probe_ops ops, void data)
	76	{
	77	return register_ftrace_function_probe(glob, ops, data);
	78	}
	79
	80	static inline
	81	void wrapper_unregister_ftrace_function_probe(char *glob,
	82	struct ftrace_probe_ops ops, void data)
	83	{
	84	return unregister_ftrace_function_probe(glob, ops, data);
	85	}
	86	#endif
	87
	88	#endif /* _LTTNG_WRAPPER_FTRACE_H */