[deliverable/lttng-modules.git] / include / 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>

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,10,0))
#define LTTNG_DEFINE_TRACE(name, proto, args)		\
	DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
#else
#define LTTNG_DEFINE_TRACE(name, proto, args)		\
	DEFINE_TRACE(name)
#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)) */

#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;
	}
}

/*
 * No canary for 'tracepoint_module_notify()', it's only defined in 'kernel/tracepoint.c'.
 *
 * static inline
 * int __canary__tracepoint_module_notify(struct notifier_block *nb,
 * 		unsigned long val, struct module *mod)
 * {
 * 	return tracepoint_module_notify(nb, val, mod);
 * }
 */

#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
0116245f MJ	17	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,10,0))
	18	#define LTTNG_DEFINE_TRACE(name, proto, args) \
	19	DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
	20	#else
	21	#define LTTNG_DEFINE_TRACE(name, proto, args) \
	22	DEFINE_TRACE(name)
	23	#endif
	24
3a523f5b MD	25	#ifndef HAVE_KABI_2635_TRACEPOINT
	26
	27	#define kabi_2635_tracepoint_probe_register tracepoint_probe_register
	28	#define kabi_2635_tracepoint_probe_unregister tracepoint_probe_unregister
3a523f5b MD	29
	30	#endif /* HAVE_KABI_2635_TRACEPOINT */
	31
20591cf7 MD	32	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0))
20591cf7 MD	33
2df37e95	34	#include <lttng/tracepoint.h>
20591cf7 MD	35
	36	#define lttng_wrapper_tracepoint_probe_register lttng_tracepoint_probe_register
	37	#define lttng_wrapper_tracepoint_probe_unregister lttng_tracepoint_probe_unregister
	38
	39	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */
	40
	41	#define lttng_wrapper_tracepoint_probe_register kabi_2635_tracepoint_probe_register
	42	#define lttng_wrapper_tracepoint_probe_unregister kabi_2635_tracepoint_probe_unregister
	43
	44	static inline
	45	int lttng_tracepoint_init(void)
	46	{
	47	return 0;
	48	}
	49
	50	static inline
	51	void lttng_tracepoint_exit(void)
	52	{
	53	}
	54
	55	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,15,0)) */
	56
b1152922	57	#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG))
dd8d5afb MD	58
dd8d5afb MD	59	#include <linux/kallsyms.h>
5a2f5e92	60	#include <wrapper/kallsyms.h>
dd8d5afb MD	61
	62	static inline
	63	int wrapper_tracepoint_module_notify(struct notifier_block *nb,
	64	unsigned long val, struct module *mod)
	65	{
	66	int (tracepoint_module_notify_sym)(struct notifier_block nb,
	67	unsigned long val, struct module *mod);
	68
	69	tracepoint_module_notify_sym =
	70	(void *) kallsyms_lookup_funcptr("tracepoint_module_notify");
	71	if (tracepoint_module_notify_sym) {
	72	return tracepoint_module_notify_sym(nb, val, mod);
	73	} else {
e36de50d	74	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	75	return -ENOSYS;
	76	}
	77	}
	78
3dfec228 MJ	79	/*
	80	* No canary for 'tracepoint_module_notify()', it's only defined in 'kernel/tracepoint.c'.
	81	*
	82	* static inline
	83	* int __canary__tracepoint_module_notify(struct notifier_block *nb,
	84	* unsigned long val, struct module *mod)
	85	* {
	86	* return tracepoint_module_notify(nb, val, mod);
	87	* }
	88	*/
	89
b1152922	90	#endif /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG)) */
0147ae64	91
b1152922	92	#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE))
0147ae64	93
dd8d5afb MD	94	static inline
	95	int wrapper_lttng_fixup_sig(struct module *mod)
	96	{
	97	int ret = 0;
	98
	99	/*
	100	* This is for module.c confusing force loaded modules with
	101	* unsigned modules.
	102	*/
	103	if (!THIS_MODULE->sig_ok &&
	104	THIS_MODULE->taints & (1U << TAINT_FORCED_MODULE)) {
	105	THIS_MODULE->taints &= ~(1U << TAINT_FORCED_MODULE);
	106	ret = wrapper_tracepoint_module_notify(NULL,
	107	MODULE_STATE_COMING, mod);
	108	THIS_MODULE->taints \|= (1U << TAINT_FORCED_MODULE);
	109	}
	110	return ret;
	111	}
	112
b1152922	113	#else /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE)) */
dd8d5afb MD	114
	115	static inline
	116	int wrapper_lttng_fixup_sig(struct module *mod)
	117	{
	118	return 0;
	119	}
	120
b1152922	121	#endif /* #else #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0) && defined(CONFIG_MODULE_SIG) && defined(MODULE)) */
dd8d5afb	122
c1b0a625 MD	123	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0))
	124	static inline struct tracepoint lttng_tracepoint_ptr_deref(tracepoint_ptr_t p)
	125	{
	126	return tracepoint_ptr_deref(p);
	127	}
	128	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0)) */
61259e63	129	static inline struct tracepoint lttng_tracepoint_ptr_deref(struct tracepoint const *p)
c1b0a625 MD	130	{
	131	return *p;
	132	}
	133	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,19,0)) */
	134
3a523f5b	135	#endif /* _LTTNG_WRAPPER_TRACEPOINT_H */