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

#ifndef _LTTNG_WRAPPER_TRACEPOINT_H
#define _LTTNG_WRAPPER_TRACEPOINT_H

/*
 * wrapper/tracepoint.h
 *
 * wrapper around DECLARE_EVENT_CLASS.
 *
 * 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/version.h>
#include <linux/tracepoint.h>
#include <linux/module.h>

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35))

#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)

#endif

#ifndef HAVE_KABI_2635_TRACEPOINT

#define kabi_2635_tracepoint_probe_register tracepoint_probe_register
#define kabi_2635_tracepoint_probe_unregister tracepoint_probe_unregister

#endif /* HAVE_KABI_2635_TRACEPOINT */

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0))

#include <lttng-tracepoint.h>

#define lttng_wrapper_tracepoint_probe_register lttng_tracepoint_probe_register
#define lttng_wrapper_tracepoint_probe_unregister lttng_tracepoint_probe_unregister

#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */

#define lttng_wrapper_tracepoint_probe_register kabi_2635_tracepoint_probe_register
#define lttng_wrapper_tracepoint_probe_unregister kabi_2635_tracepoint_probe_unregister

static inline
int lttng_tracepoint_init(void)
{
	return 0;
}

static inline
void lttng_tracepoint_exit(void)
{
}

#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */

#ifdef CONFIG_MODULE_SIG

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

static inline
int wrapper_tracepoint_module_notify(struct notifier_block *nb,
		unsigned long val, struct module *mod)
{
	int (*tracepoint_module_notify_sym)(struct notifier_block *nb,
			unsigned long val, struct module *mod);

	tracepoint_module_notify_sym =
		(void *) kallsyms_lookup_funcptr("tracepoint_module_notify");
	if (tracepoint_module_notify_sym) {
		return tracepoint_module_notify_sym(nb, val, mod);
	} else {
		printk(KERN_WARNING "LTTng: tracepoint_module_notify symbol lookup failed. It probably means you kernel don't need this work-around. Please consider upgrading LTTng modules to make this warning go away.\n");
		return -ENOSYS;
	}
}

static inline
int wrapper_lttng_fixup_sig(struct module *mod)
{
	int ret = 0;

	/*
	 * This is for module.c confusing force loaded modules with
	 * unsigned modules.
	 */
	if (!THIS_MODULE->sig_ok &&
			THIS_MODULE->taints & (1U << TAINT_FORCED_MODULE)) {
		THIS_MODULE->taints &= ~(1U << TAINT_FORCED_MODULE);
		ret = wrapper_tracepoint_module_notify(NULL,
				MODULE_STATE_COMING, mod);
		THIS_MODULE->taints |= (1U << TAINT_FORCED_MODULE);
	}
	return ret;
}

#else /* CONFIG_MODULE_SIG */

static inline
int wrapper_lttng_fixup_sig(struct module *mod)
{
	return 0;
}

#endif /* #else CONFIG_MODULE_SIG */

#endif /* _LTTNG_WRAPPER_TRACEPOINT_H */
Commit	Line	Data
3a523f5b MD	1	#ifndef _LTTNG_WRAPPER_TRACEPOINT_H
	2	#define _LTTNG_WRAPPER_TRACEPOINT_H
	3
	4	/*
	5	* wrapper/tracepoint.h
	6	*
	7	* wrapper around DECLARE_EVENT_CLASS.
	8	*
	9	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	10	*
	11	* This library is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU Lesser General Public
	13	* License as published by the Free Software Foundation; only
	14	* version 2.1 of the License.
	15	*
	16	* This library is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	19	* Lesser General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU Lesser General Public
	22	* License along with this library; if not, write to the Free Software
	23	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	24	*/
	25
	26	#include <linux/version.h>
	27	#include <linux/tracepoint.h>
dd8d5afb	28	#include <linux/module.h>
3a523f5b MD	29
	30	#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35))
	31
	32	#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
	33
	34	#endif
	35
	36	#ifndef HAVE_KABI_2635_TRACEPOINT
	37
	38	#define kabi_2635_tracepoint_probe_register tracepoint_probe_register
	39	#define kabi_2635_tracepoint_probe_unregister tracepoint_probe_unregister
3a523f5b MD	40
	41	#endif /* HAVE_KABI_2635_TRACEPOINT */
	42
20591cf7 MD	43	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0))
20591cf7 MD	44
5a2f5e92	45	#include <lttng-tracepoint.h>
20591cf7 MD	46
	47	#define lttng_wrapper_tracepoint_probe_register lttng_tracepoint_probe_register
	48	#define lttng_wrapper_tracepoint_probe_unregister lttng_tracepoint_probe_unregister
	49
	50	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */
	51
	52	#define lttng_wrapper_tracepoint_probe_register kabi_2635_tracepoint_probe_register
	53	#define lttng_wrapper_tracepoint_probe_unregister kabi_2635_tracepoint_probe_unregister
	54
	55	static inline
	56	int lttng_tracepoint_init(void)
	57	{
	58	return 0;
	59	}
	60
	61	static inline
	62	void lttng_tracepoint_exit(void)
	63	{
	64	}
	65
	66	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */
	67
dd8d5afb MD	68	#ifdef CONFIG_MODULE_SIG
	69
	70	#include <linux/kallsyms.h>
5a2f5e92	71	#include <wrapper/kallsyms.h>
dd8d5afb MD	72
	73	static inline
	74	int wrapper_tracepoint_module_notify(struct notifier_block *nb,
	75	unsigned long val, struct module *mod)
	76	{
	77	int (tracepoint_module_notify_sym)(struct notifier_block nb,
	78	unsigned long val, struct module *mod);
	79
	80	tracepoint_module_notify_sym =
	81	(void *) kallsyms_lookup_funcptr("tracepoint_module_notify");
	82	if (tracepoint_module_notify_sym) {
	83	return tracepoint_module_notify_sym(nb, val, mod);
	84	} else {
d16aa9c9	85	printk(KERN_WARNING "LTTng: tracepoint_module_notify symbol lookup failed. It probably means you kernel don't need this work-around. Please consider upgrading LTTng modules to make this warning go away.\n");
dd8d5afb MD	86	return -ENOSYS;
	87	}
	88	}
	89
	90	static inline
	91	int wrapper_lttng_fixup_sig(struct module *mod)
	92	{
	93	int ret = 0;
	94
	95	/*
	96	* This is for module.c confusing force loaded modules with
	97	* unsigned modules.
	98	*/
	99	if (!THIS_MODULE->sig_ok &&
	100	THIS_MODULE->taints & (1U << TAINT_FORCED_MODULE)) {
	101	THIS_MODULE->taints &= ~(1U << TAINT_FORCED_MODULE);
	102	ret = wrapper_tracepoint_module_notify(NULL,
	103	MODULE_STATE_COMING, mod);
	104	THIS_MODULE->taints \|= (1U << TAINT_FORCED_MODULE);
	105	}
	106	return ret;
	107	}
	108
	109	#else /* CONFIG_MODULE_SIG */
	110
	111	static inline
	112	int wrapper_lttng_fixup_sig(struct module *mod)
	113	{
	114	return 0;
	115	}
	116
	117	#endif /* #else CONFIG_MODULE_SIG */
	118
3a523f5b	119	#endif /* _LTTNG_WRAPPER_TRACEPOINT_H */