[lttng-modules.git] / include / wrapper / vmalloc.h

/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
 *
 * wrapper/vmalloc.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>
 */

#ifndef _LTTNG_WRAPPER_VMALLOC_H
#define _LTTNG_WRAPPER_VMALLOC_H

#include <linux/version.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>

#ifdef CONFIG_KALLSYMS

#include <linux/kallsyms.h>
#include <wrapper/kallsyms.h>
#include <lttng/kernel-version.h>

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))

/*
 * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
 * are now synchronized when they are created or torn down.
 */
static inline
void wrapper_vmalloc_sync_mappings(void)
{}

#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
  || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0)            \
  || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0)            \
  || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0)            \
  || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0)         \
  || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0)         \
  || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0)          \
  || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0))	  \
  || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \
  || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0)   \
  || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)

static inline
void wrapper_vmalloc_sync_mappings(void)
{
	void (*vmalloc_sync_mappings_sym)(void);

	vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings");
	if (vmalloc_sync_mappings_sym) {
		vmalloc_sync_mappings_sym();
	} else {
#ifdef CONFIG_X86
		/*
		 * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not
		 * trigger recursive page faults.
		 */
		printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n");
		printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
#endif
	}
}

/*
 * Canary function to check for 'vmalloc_sync_mappings()' at compile time.
 *
 * From 'include/linux/vmalloc.h':
 *
 *   void vmalloc_sync_mappings(void);
 */
static inline
void __canary__vmalloc_sync_mappings(void)
{
	vmalloc_sync_mappings();
}

#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */

/*
 * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.6.
 */
static inline
void wrapper_vmalloc_sync_mappings(void)
{
	void (*vmalloc_sync_all_sym)(void);

	vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all");
	if (vmalloc_sync_all_sym) {
		vmalloc_sync_all_sym();
	} else {
#ifdef CONFIG_X86
		/*
		 * Only x86 needs vmalloc_sync_all to make sure LTTng does not
		 * trigger recursive page faults.
		 */
		printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
		printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
#endif
	}
}

/*
 * Canary function to check for 'vmalloc_sync_all()' at compile time.
 *
 * From 'include/linux/vmalloc.h':
 *
 *   void vmalloc_sync_all(void);
 */
static inline
void __canary__vmalloc_sync_all(void)
{
	vmalloc_sync_all();
}

#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */

#else /* CONFIG_KALLSYMS */

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))

/*
 * wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
 * are now synchronized when they are created or torn down.
 */
static inline
void wrapper_vmalloc_sync_mappings(void)
{}

#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
  || LTTNG_KERNEL_RANGE(5,5,12, 5,6,0)            \
  || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0)            \
  || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0)            \
  || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0)         \
  || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0)         \
  || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0)          \
  || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0))	  \
  || LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \
  || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0)   \
  || LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)

static inline
void wrapper_vmalloc_sync_mappings(void)
{
	return vmalloc_sync_mappings();
}

#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */

static inline
void wrapper_vmalloc_sync_mappings(void)
{
	return vmalloc_sync_all();
}

#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */

#endif

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
static inline
void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
{
	void *ret;

	ret = kvmalloc_node(size, flags, node);
	if (is_vmalloc_addr(ret)) {
		/*
		 * Make sure we don't trigger recursive page faults in the
		 * tracing fast path.
		 */
		wrapper_vmalloc_sync_mappings();
	}
	return ret;
}

static inline
void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
{
	return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node);
}

static inline
void *lttng_kvmalloc(unsigned long size, gfp_t flags)
{
	return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
}

static inline
void *lttng_kvzalloc(unsigned long size, gfp_t flags)
{
	return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
}

static inline
void lttng_kvfree(const void *addr)
{
	kvfree(addr);
}

#else

#include <linux/slab.h>

static inline
void print_vmalloc_node_range_warning(void)
{
	printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n");
	printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n");
	printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n");
}

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0))

/*
 * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
 */
static inline
void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			const void *caller)
{
#ifdef CONFIG_KALLSYMS
	/*
	 * If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
	 */
	void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			const void *caller);

	lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
	if (lttng__vmalloc_node_range)
		return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
				vm_flags, node, caller);
#endif
	if (node != NUMA_NO_NODE)
		print_vmalloc_node_range_warning();
	return __vmalloc(size, gfp_mask, prot);
}

/*
 * Canary function to check for '__vmalloc_node_range()' at compile time.
 *
 * From 'include/linux/vmalloc.h':
 *
 *   extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 *                           unsigned long start, unsigned long end, gfp_t gfp_mask,
 *                           pgprot_t prot, unsigned long vm_flags, int node,
 *                           const void *caller);
 */
static inline
void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			const void *caller)
{
	return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
			vm_flags, node, caller);
}

#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0))

/*
 * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
 */
static inline
void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			const void *caller)
{
#ifdef CONFIG_KALLSYMS
	/*
	 * If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
	 */
	void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, int node, const void *caller);

	lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
	if (lttng__vmalloc_node_range)
		return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
				node, caller);
#endif
	if (node != NUMA_NO_NODE)
		print_vmalloc_node_range_warning();
	return __vmalloc(size, gfp_mask, prot);
}

/*
 * Canary function to check for '__vmalloc_node_range()' at compile time.
 *
 * From 'include/linux/vmalloc.h':
 *
 *   extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 *                           unsigned long start, unsigned long end, gfp_t gfp_mask,
 *                           pgprot_t prot, unsigned long vm_flags, int node,
 *                           const void *caller);
 */
static inline
void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, int node, const void *caller)
{
	return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
			node, caller);
}

#else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)) */

/*
 * kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
 */
static inline
void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			void *caller)
{
#ifdef CONFIG_KALLSYMS
	/*
	 * If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
	 */
	void *(*lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, int node, void *caller);

	lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
	if (lttng__vmalloc_node_range)
		return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
				node, caller);
#endif
	if (node != NUMA_NO_NODE)
		print_vmalloc_node_range_warning();
	return __vmalloc(size, gfp_mask, prot);
}

/*
 * Canary function to check for '__vmalloc_node_range()' at compile time.
 *
 * From 'include/linux/vmalloc.h':
 *
 *   extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 *                           unsigned long start, unsigned long end, gfp_t gfp_mask,
 *                           pgprot_t prot, unsigned long vm_flags, int node,
 *                           void *caller);
 */
static inline
void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, int node, void *caller)
{
	return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
			node, caller);
}

#endif

/**
 * lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon
 * failure, fall back to non-contiguous (vmalloc) allocation.
 * @size: size of the request.
 * @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL.
 *
 * Uses kmalloc to get the memory but if the allocation fails then falls back
 * to the vmalloc allocator. Use lttng_kvfree to free the memory.
 *
 * Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported
 */
static inline
void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
{
	void *ret;

	/*
	 * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
	 * so the given set of flags has to be compatible.
	 */
	WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL);

	/*
	 * If the allocation fits in a single page, do not fallback.
	 */
	if (size <= PAGE_SIZE) {
		return kmalloc_node(size, flags, node);
	}

	/*
	 * Make sure that larger requests are not too disruptive - no OOM
	 * killer and no allocation failure warnings as we have a fallback
	 */
	ret = kmalloc_node(size, flags | __GFP_NOWARN | __GFP_NORETRY, node);
	if (!ret) {
		ret = __lttng_vmalloc_node_range(size, 1,
				VMALLOC_START, VMALLOC_END,
				flags | __GFP_HIGHMEM, PAGE_KERNEL, 0,
				node, __builtin_return_address(0));
		/*
		 * Make sure we don't trigger recursive page faults in the
		 * tracing fast path.
		 */
		wrapper_vmalloc_sync_mappings();
	}
	return ret;
}

static inline
void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
{
	return lttng_kvmalloc_node(size, flags | __GFP_ZERO, node);
}

static inline
void *lttng_kvmalloc(unsigned long size, gfp_t flags)
{
	return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
}

static inline
void *lttng_kvzalloc(unsigned long size, gfp_t flags)
{
	return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
}

static inline
void lttng_kvfree(const void *addr)
{
	if (is_vmalloc_addr(addr)) {
		vfree(addr);
	} else {
		kfree(addr);
	}
}
#endif

#endif /* _LTTNG_WRAPPER_VMALLOC_H */
Commit	Line	Data
b7cdc182	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed	2	*
886d51a3	3	* wrapper/vmalloc.h
6d2a620c MD	4	*
	5	* wrapper around vmalloc_sync_all. Using KALLSYMS to get its address when
	6	* available, else we need to have a kernel that exports this function to GPL
	7	* modules.
	8	*
886d51a3	9	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6d2a620c MD	10	*/
6d2a620c MD	11
9f36eaed MJ	12	#ifndef _LTTNG_WRAPPER_VMALLOC_H
	13	#define _LTTNG_WRAPPER_VMALLOC_H
	14
48f5e0b5 MJ	15	#include <linux/version.h>
48f5e0b5 MJ	16	#include <linux/vmalloc.h>
01ab5113	17	#include <linux/mm.h>
48f5e0b5	18
6d2a620c MD	19	#ifdef CONFIG_KALLSYMS
	20
	21	#include <linux/kallsyms.h>
5a2f5e92	22	#include <wrapper/kallsyms.h>
2b3dbafc	23	#include <lttng/kernel-version.h>
6d2a620c	24
0dcc94fa MJ	25	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))
	26
	27	/*
	28	* wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
	29	* are now synchronized when they are created or torn down.
	30	*/
	31	static inline
	32	void wrapper_vmalloc_sync_mappings(void)
	33	{}
	34
	35	#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
9bfe744a	36	\|\| LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \
2b3dbafc OP	37	\|\| LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \
	38	\|\| LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \
	39	\|\| LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \
	40	\|\| LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \
	41	\|\| LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \
2e4c781e SB	42	\|\| LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \
	43	\|\| LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,16,0,0) \
	44	\|\| LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \
	45	\|\| LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)
263b6c88 MD	46
	47	static inline
	48	void wrapper_vmalloc_sync_mappings(void)
	49	{
	50	void (*vmalloc_sync_mappings_sym)(void);
	51
	52	vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings");
	53	if (vmalloc_sync_mappings_sym) {
	54	vmalloc_sync_mappings_sym();
	55	} else {
	56	#ifdef CONFIG_X86
	57	/*
	58	* Only x86 needs vmalloc_sync_mappings to make sure LTTng does not
	59	* trigger recursive page faults.
	60	*/
	61	printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n");
	62	printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
	63	#endif
	64	}
	65	}
	66
3dfec228 MJ	67	/*
	68	* Canary function to check for 'vmalloc_sync_mappings()' at compile time.
	69	*
	70	* From 'include/linux/vmalloc.h':
	71	*
	72	* void vmalloc_sync_mappings(void);
	73	*/
	74	static inline
	75	void __canary__vmalloc_sync_mappings(void)
	76	{
	77	vmalloc_sync_mappings();
	78	}
	79
1d618748	80	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
263b6c88 MD	81
263b6c88 MD	82	/*
3dfec228	83	* Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.6.
263b6c88	84	*/
6d2a620c	85	static inline
263b6c88	86	void wrapper_vmalloc_sync_mappings(void)
6d2a620c MD	87	{
	88	void (*vmalloc_sync_all_sym)(void);
	89
c539a324	90	vmalloc_sync_all_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_all");
6d2a620c MD	91	if (vmalloc_sync_all_sym) {
	92	vmalloc_sync_all_sym();
	93	} else {
	94	#ifdef CONFIG_X86
	95	/*
	96	* Only x86 needs vmalloc_sync_all to make sure LTTng does not
	97	* trigger recursive page faults.
	98	*/
e36de50d MD	99	printk_once(KERN_WARNING "LTTng: vmalloc_sync_all symbol lookup failed.\n");
e36de50d MD	100	printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
6d2a620c MD	101	#endif
	102	}
	103	}
263b6c88	104
3dfec228 MJ	105	/*
	106	* Canary function to check for 'vmalloc_sync_all()' at compile time.
	107	*
	108	* From 'include/linux/vmalloc.h':
	109	*
	110	* void vmalloc_sync_all(void);
	111	*/
	112	static inline
	113	void __canary__vmalloc_sync_all(void)
	114	{
	115	vmalloc_sync_all();
	116	}
	117
1d618748	118	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
263b6c88	119
f740341a	120	#else /* CONFIG_KALLSYMS */
6d2a620c	121
f740341a MJ	122	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))
	123
	124	/*
	125	* wrapper_vmalloc_sync_mappings was removed in v5.8, the vmalloc mappings
	126	* are now synchronized when they are created or torn down.
	127	*/
	128	static inline
	129	void wrapper_vmalloc_sync_mappings(void)
	130	{}
	131
	132	#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
9bfe744a	133	\|\| LTTNG_KERNEL_RANGE(5,5,12, 5,6,0) \
2b3dbafc OP	134	\|\| LTTNG_KERNEL_RANGE(5,4,28, 5,5,0) \
	135	\|\| LTTNG_KERNEL_RANGE(5,2,37, 5,3,0) \
	136	\|\| LTTNG_KERNEL_RANGE(4,19,113, 4,20,0) \
	137	\|\| LTTNG_KERNEL_RANGE(4,14,175, 4,15,0) \
	138	\|\| LTTNG_KERNEL_RANGE(4,9,218, 4,10,0) \
2e4c781e SB	139	\|\| LTTNG_KERNEL_RANGE(4,4,218, 4,5,0)) \
	140	\|\| LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,97, 4,18,0,0) \
	141	\|\| LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,48, 5,1,0,0) \
	142	\|\| LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,52, 5,4,0,0)
263b6c88	143
6d2a620c	144	static inline
263b6c88 MD	145	void wrapper_vmalloc_sync_mappings(void)
	146	{
	147	return vmalloc_sync_mappings();
	148	}
	149
1d618748	150	#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
263b6c88 MD	151
	152	static inline
	153	void wrapper_vmalloc_sync_mappings(void)
6d2a620c MD	154	{
	155	return vmalloc_sync_all();
	156	}
263b6c88	157
1d618748	158	#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
263b6c88	159
6d2a620c	160	#endif
b13f3ebe	161
48f5e0b5 MJ	162	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
	163	static inline
	164	void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
	165	{
	166	void *ret;
	167
	168	ret = kvmalloc_node(size, flags, node);
	169	if (is_vmalloc_addr(ret)) {
	170	/*
	171	* Make sure we don't trigger recursive page faults in the
	172	* tracing fast path.
	173	*/
263b6c88	174	wrapper_vmalloc_sync_mappings();
48f5e0b5 MJ	175	}
	176	return ret;
	177	}
	178
	179	static inline
	180	void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
	181	{
	182	return lttng_kvmalloc_node(size, flags \| __GFP_ZERO, node);
	183	}
	184
	185	static inline
	186	void *lttng_kvmalloc(unsigned long size, gfp_t flags)
	187	{
	188	return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
	189	}
	190
	191	static inline
	192	void *lttng_kvzalloc(unsigned long size, gfp_t flags)
	193	{
	194	return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
	195	}
	196
	197	static inline
	198	void lttng_kvfree(const void *addr)
	199	{
	200	kvfree(addr);
	201	}
	202
	203	#else
	204
	205	#include <linux/slab.h>
48f5e0b5	206
20eb87c9 MD	207	static inline
	208	void print_vmalloc_node_range_warning(void)
	209	{
	210	printk_once(KERN_WARNING "LTTng: __vmalloc_node_range symbol lookup failed.\n");
	211	printk_once(KERN_WARNING "Tracer performance will be degraded on NUMA systems.\n");
	212	printk_once(KERN_WARNING "Please rebuild your kernel with CONFIG_KALLSYMS enabled.\n");
	213	}
	214
fd094ddf MJ	215	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0))
fd094ddf MJ	216
48f5e0b5 MJ	217	/*
	218	* kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
	219	*/
	220	static inline
20eb87c9 MD	221	void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
	222	unsigned long start, unsigned long end, gfp_t gfp_mask,
	223	pgprot_t prot, unsigned long vm_flags, int node,
	224	const void *caller)
48f5e0b5	225	{
48f5e0b5 MJ	226	#ifdef CONFIG_KALLSYMS
48f5e0b5 MJ	227	/*
20eb87c9	228	* If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
48f5e0b5	229	*/
20eb87c9 MD	230	void (lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
	231	unsigned long start, unsigned long end, gfp_t gfp_mask,
	232	pgprot_t prot, unsigned long vm_flags, int node,
	233	const void *caller);
	234
	235	lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
	236	if (lttng__vmalloc_node_range)
	237	return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
	238	vm_flags, node, caller);
48f5e0b5	239	#endif
20eb87c9 MD	240	if (node != NUMA_NO_NODE)
	241	print_vmalloc_node_range_warning();
	242	return __vmalloc(size, gfp_mask, prot);
48f5e0b5	243	}
3dfec228 MJ	244
	245	/*
	246	* Canary function to check for '__vmalloc_node_range()' at compile time.
	247	*
	248	* From 'include/linux/vmalloc.h':
	249	*
	250	* extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
	251	* unsigned long start, unsigned long end, gfp_t gfp_mask,
	252	* pgprot_t prot, unsigned long vm_flags, int node,
	253	* const void *caller);
	254	*/
	255	static inline
	256	void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
	257	unsigned long start, unsigned long end, gfp_t gfp_mask,
	258	pgprot_t prot, unsigned long vm_flags, int node,
	259	const void *caller)
	260	{
	261	return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
	262	vm_flags, node, caller);
	263	}
48f5e0b5	264
0c8a119a	265	#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0))
fd094ddf MJ	266
	267	/*
	268	* kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
	269	*/
	270	static inline
	271	void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
	272	unsigned long start, unsigned long end, gfp_t gfp_mask,
	273	pgprot_t prot, unsigned long vm_flags, int node,
	274	const void *caller)
	275	{
	276	#ifdef CONFIG_KALLSYMS
	277	/*
	278	* If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
	279	*/
	280	void (lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
	281	unsigned long start, unsigned long end, gfp_t gfp_mask,
	282	pgprot_t prot, int node, const void *caller);
	283
	284	lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
	285	if (lttng__vmalloc_node_range)
	286	return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
	287	node, caller);
	288	#endif
	289	if (node != NUMA_NO_NODE)
	290	print_vmalloc_node_range_warning();
	291	return __vmalloc(size, gfp_mask, prot);
	292	}
	293
	294	/*
	295	* Canary function to check for '__vmalloc_node_range()' at compile time.
	296	*
	297	* From 'include/linux/vmalloc.h':
	298	*
	299	* extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
	300	* unsigned long start, unsigned long end, gfp_t gfp_mask,
	301	* pgprot_t prot, unsigned long vm_flags, int node,
	302	* const void *caller);
	303	*/
	304	static inline
	305	void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
	306	unsigned long start, unsigned long end, gfp_t gfp_mask,
	307	pgprot_t prot, int node, const void *caller)
	308	{
	309	return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
	310	node, caller);
	311	}
	312
0c8a119a MJ	313	#else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,6,0)) */
	314
	315	/*
	316	* kallsyms wrapper of __vmalloc_node with a fallback to kmalloc_node.
	317	*/
	318	static inline
	319	void *__lttng_vmalloc_node_range(unsigned long size, unsigned long align,
	320	unsigned long start, unsigned long end, gfp_t gfp_mask,
	321	pgprot_t prot, unsigned long vm_flags, int node,
	322	void *caller)
	323	{
	324	#ifdef CONFIG_KALLSYMS
	325	/*
	326	* If we have KALLSYMS, get * __vmalloc_node_range which is not exported.
	327	*/
	328	void (lttng__vmalloc_node_range)(unsigned long size, unsigned long align,
	329	unsigned long start, unsigned long end, gfp_t gfp_mask,
	330	pgprot_t prot, int node, void *caller);
	331
	332	lttng__vmalloc_node_range = (void *) kallsyms_lookup_funcptr("__vmalloc_node_range");
	333	if (lttng__vmalloc_node_range)
	334	return lttng__vmalloc_node_range(size, align, start, end, gfp_mask, prot,
	335	node, caller);
	336	#endif
	337	if (node != NUMA_NO_NODE)
	338	print_vmalloc_node_range_warning();
	339	return __vmalloc(size, gfp_mask, prot);
	340	}
	341
	342	/*
	343	* Canary function to check for '__vmalloc_node_range()' at compile time.
	344	*
	345	* From 'include/linux/vmalloc.h':
	346	*
	347	* extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
	348	* unsigned long start, unsigned long end, gfp_t gfp_mask,
	349	* pgprot_t prot, unsigned long vm_flags, int node,
	350	* void *caller);
	351	*/
	352	static inline
	353	void *__canary____lttng_vmalloc_node_range(unsigned long size, unsigned long align,
	354	unsigned long start, unsigned long end, gfp_t gfp_mask,
	355	pgprot_t prot, int node, void *caller)
	356	{
	357	return __vmalloc_node_range(size, align, start, end, gfp_mask, prot,
	358	node, caller);
	359	}
	360
fd094ddf MJ	361	#endif
fd094ddf MJ	362
48f5e0b5 MJ	363	/**
	364	* lttng_kvmalloc_node - attempt to allocate physically contiguous memory, but upon
	365	* failure, fall back to non-contiguous (vmalloc) allocation.
	366	* @size: size of the request.
	367	* @flags: gfp mask for the allocation - must be compatible with GFP_KERNEL.
	368	*
	369	* Uses kmalloc to get the memory but if the allocation fails then falls back
	370	* to the vmalloc allocator. Use lttng_kvfree to free the memory.
	371	*
	372	* Reclaim modifiers - __GFP_NORETRY, __GFP_REPEAT and __GFP_NOFAIL are not supported
	373	*/
	374	static inline
	375	void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
	376	{
	377	void *ret;
	378
	379	/*
	380	* vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
	381	* so the given set of flags has to be compatible.
	382	*/
	383	WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL);
	384
	385	/*
	386	* If the allocation fits in a single page, do not fallback.
	387	*/
	388	if (size <= PAGE_SIZE) {
	389	return kmalloc_node(size, flags, node);
	390	}
	391
	392	/*
	393	* Make sure that larger requests are not too disruptive - no OOM
	394	* killer and no allocation failure warnings as we have a fallback
	395	*/
	396	ret = kmalloc_node(size, flags \| __GFP_NOWARN \| __GFP_NORETRY, node);
	397	if (!ret) {
20eb87c9 MD	398	ret = __lttng_vmalloc_node_range(size, 1,
	399	VMALLOC_START, VMALLOC_END,
	400	flags \| __GFP_HIGHMEM, PAGE_KERNEL, 0,
	401	node, __builtin_return_address(0));
48f5e0b5 MJ	402	/*
	403	* Make sure we don't trigger recursive page faults in the
	404	* tracing fast path.
	405	*/
f3e4ba5d	406	wrapper_vmalloc_sync_mappings();
48f5e0b5 MJ	407	}
	408	return ret;
	409	}
	410
	411	static inline
	412	void *lttng_kvzalloc_node(unsigned long size, gfp_t flags, int node)
	413	{
	414	return lttng_kvmalloc_node(size, flags \| __GFP_ZERO, node);
	415	}
	416
	417	static inline
	418	void *lttng_kvmalloc(unsigned long size, gfp_t flags)
	419	{
	420	return lttng_kvmalloc_node(size, flags, NUMA_NO_NODE);
	421	}
	422
	423	static inline
	424	void *lttng_kvzalloc(unsigned long size, gfp_t flags)
	425	{
	426	return lttng_kvzalloc_node(size, flags, NUMA_NO_NODE);
	427	}
	428
	429	static inline
	430	void lttng_kvfree(const void *addr)
	431	{
	432	if (is_vmalloc_addr(addr)) {
	433	vfree(addr);
	434	} else {
	435	kfree(addr);
	436	}
	437	}
	438	#endif
	439
a90917c3	440	#endif /* _LTTNG_WRAPPER_VMALLOC_H */