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

/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
 *
 * wrapper/tracepoint.h
 *
 * wrapper around DECLARE_EVENT_CLASS.
 *
 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#ifndef _LTTNG_WRAPPER_TRACEPOINT_H
#define _LTTNG_WRAPPER_TRACEPOINT_H

#include <linux/version.h>
#include <linux/tracepoint.h>
#include <linux/module.h>

#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)) */

#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(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_once(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;
	}
}

#endif /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG)) */

#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE))

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 /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE)) */

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

#endif /* #else #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE)) */

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
static inline struct tracepoint *lttng_tracepoint_ptr_deref(tracepoint_ptr_t *p)
{
	return tracepoint_ptr_deref(p);
}
#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0)) */
static inline struct tracepoint *lttng_tracepoint_ptr_deref(struct tracepoint * const *p)
{
	return *p;
}
#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0)) */

#endif /* _LTTNG_WRAPPER_TRACEPOINT_H */
Commit	Line	Data
b7cdc182	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed	2	*
3a523f5b MD	3	* wrapper/tracepoint.h
	4	*
	5	* wrapper around DECLARE_EVENT_CLASS.
	6	*
	7	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3a523f5b MD	8	*/
3a523f5b MD	9
9f36eaed MJ	10	#ifndef _LTTNG_WRAPPER_TRACEPOINT_H
	11	#define _LTTNG_WRAPPER_TRACEPOINT_H
	12
3a523f5b MD	13	#include <linux/version.h>
3a523f5b MD	14	#include <linux/tracepoint.h>
dd8d5afb	15	#include <linux/module.h>
3a523f5b	16
3a523f5b MD	17	#ifndef HAVE_KABI_2635_TRACEPOINT
	18
	19	#define kabi_2635_tracepoint_probe_register tracepoint_probe_register
	20	#define kabi_2635_tracepoint_probe_unregister tracepoint_probe_unregister
3a523f5b MD	21
	22	#endif /* HAVE_KABI_2635_TRACEPOINT */
	23
20591cf7 MD	24	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0))
20591cf7 MD	25
2df37e95	26	#include <lttng/tracepoint.h>
20591cf7 MD	27
	28	#define lttng_wrapper_tracepoint_probe_register lttng_tracepoint_probe_register
	29	#define lttng_wrapper_tracepoint_probe_unregister lttng_tracepoint_probe_unregister
	30
	31	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */
	32
	33	#define lttng_wrapper_tracepoint_probe_register kabi_2635_tracepoint_probe_register
	34	#define lttng_wrapper_tracepoint_probe_unregister kabi_2635_tracepoint_probe_unregister
	35
	36	static inline
	37	int lttng_tracepoint_init(void)
	38	{
	39	return 0;
	40	}
	41
	42	static inline
	43	void lttng_tracepoint_exit(void)
	44	{
	45	}
	46
	47	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */
	48
b1152922	49	#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG))
dd8d5afb MD	50
dd8d5afb MD	51	#include <linux/kallsyms.h>
5a2f5e92	52	#include <wrapper/kallsyms.h>
dd8d5afb MD	53
	54	static inline
	55	int wrapper_tracepoint_module_notify(struct notifier_block *nb,
	56	unsigned long val, struct module *mod)
	57	{
	58	int (tracepoint_module_notify_sym)(struct notifier_block nb,
	59	unsigned long val, struct module *mod);
	60
	61	tracepoint_module_notify_sym =
	62	(void *) kallsyms_lookup_funcptr("tracepoint_module_notify");
	63	if (tracepoint_module_notify_sym) {
	64	return tracepoint_module_notify_sym(nb, val, mod);
	65	} else {
e36de50d	66	printk_once(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	67	return -ENOSYS;
	68	}
	69	}
	70
b1152922	71	#endif /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG)) */
0147ae64	72
b1152922	73	#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE))
0147ae64	74
dd8d5afb MD	75	static inline
	76	int wrapper_lttng_fixup_sig(struct module *mod)
	77	{
	78	int ret = 0;
	79
	80	/*
	81	* This is for module.c confusing force loaded modules with
	82	* unsigned modules.
	83	*/
	84	if (!THIS_MODULE->sig_ok &&
	85	THIS_MODULE->taints & (1U << TAINT_FORCED_MODULE)) {
	86	THIS_MODULE->taints &= ~(1U << TAINT_FORCED_MODULE);
	87	ret = wrapper_tracepoint_module_notify(NULL,
	88	MODULE_STATE_COMING, mod);
	89	THIS_MODULE->taints \|= (1U << TAINT_FORCED_MODULE);
	90	}
	91	return ret;
	92	}
	93
b1152922	94	#else /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE)) */
dd8d5afb MD	95
	96	static inline
	97	int wrapper_lttng_fixup_sig(struct module *mod)
	98	{
	99	return 0;
	100	}
	101
b1152922	102	#endif /* #else #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE)) */
dd8d5afb	103
c1b0a625 MD	104	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
	105	static inline struct tracepoint lttng_tracepoint_ptr_deref(tracepoint_ptr_t p)
	106	{
	107	return tracepoint_ptr_deref(p);
	108	}
	109	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0)) */
61259e63	110	static inline struct tracepoint lttng_tracepoint_ptr_deref(struct tracepoint const *p)
c1b0a625 MD	111	{
	112	return *p;
	113	}
	114	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0)) */
	115
3a523f5b	116	#endif /* _LTTNG_WRAPPER_TRACEPOINT_H */