[linux-2.6-block.git] / include / linux / vmalloc.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_VMALLOC_H
#define _LINUX_VMALLOC_H

#include <linux/alloc_tag.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/llist.h>
#include <asm/page.h>		/* pgprot_t */
#include <linux/rbtree.h>
#include <linux/overflow.h>

#include <asm/vmalloc.h>

struct vm_area_struct;		/* vma defining user mapping in mm_types.h */
struct notifier_block;		/* in notifier.h */
struct iov_iter;		/* in uio.h */

/* bits in flags of vmalloc's vm_struct below */
#define VM_IOREMAP		0x00000001	/* ioremap() and friends */
#define VM_ALLOC		0x00000002	/* vmalloc() */
#define VM_MAP			0x00000004	/* vmap()ed pages */
#define VM_USERMAP		0x00000008	/* suitable for remap_vmalloc_range */
#define VM_DMA_COHERENT		0x00000010	/* dma_alloc_coherent */
#define VM_UNINITIALIZED	0x00000020	/* vm_struct is not fully initialized */
#define VM_NO_GUARD		0x00000040      /* ***DANGEROUS*** don't add guard page */
#define VM_KASAN		0x00000080      /* has allocated kasan shadow memory */
#define VM_FLUSH_RESET_PERMS	0x00000100	/* reset direct map and flush TLB on unmap, can't be freed in atomic context */
#define VM_MAP_PUT_PAGES	0x00000200	/* put pages and free array in vfree */
#define VM_ALLOW_HUGE_VMAP	0x00000400      /* Allow for huge pages on archs with HAVE_ARCH_HUGE_VMALLOC */

#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
	!defined(CONFIG_KASAN_VMALLOC)
#define VM_DEFER_KMEMLEAK	0x00000800	/* defer kmemleak object creation */
#else
#define VM_DEFER_KMEMLEAK	0
#endif
#define VM_SPARSE		0x00001000	/* sparse vm_area. not all pages are present. */

/* bits [20..32] reserved for arch specific ioremap internals */

/*
 * Maximum alignment for ioremap() regions.
 * Can be overridden by arch-specific value.
 */
#ifndef IOREMAP_MAX_ORDER
#define IOREMAP_MAX_ORDER	(7 + PAGE_SHIFT)	/* 128 pages */
#endif

struct vm_struct {
	struct vm_struct	*next;
	void			*addr;
	unsigned long		size;
	unsigned long		flags;
	struct page		**pages;
#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
	unsigned int		page_order;
#endif
	unsigned int		nr_pages;
	phys_addr_t		phys_addr;
	const void		*caller;
};

struct vmap_area {
	unsigned long va_start;
	unsigned long va_end;

	struct rb_node rb_node;         /* address sorted rbtree */
	struct list_head list;          /* address sorted list */

	/*
	 * The following two variables can be packed, because
	 * a vmap_area object can be either:
	 *    1) in "free" tree (root is free_vmap_area_root)
	 *    2) or "busy" tree (root is vmap_area_root)
	 */
	union {
		unsigned long subtree_max_size; /* in "free" tree */
		struct vm_struct *vm;           /* in "busy" tree */
	};
	unsigned long flags; /* mark type of vm_map_ram area */
};

/* archs that select HAVE_ARCH_HUGE_VMAP should override one or more of these */
#ifndef arch_vmap_p4d_supported
static inline bool arch_vmap_p4d_supported(pgprot_t prot)
{
	return false;
}
#endif

#ifndef arch_vmap_pud_supported
static inline bool arch_vmap_pud_supported(pgprot_t prot)
{
	return false;
}
#endif

#ifndef arch_vmap_pmd_supported
static inline bool arch_vmap_pmd_supported(pgprot_t prot)
{
	return false;
}
#endif

#ifndef arch_vmap_pte_range_map_size
static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr, unsigned long end,
							 u64 pfn, unsigned int max_page_shift)
{
	return PAGE_SIZE;
}
#endif

#ifndef arch_vmap_pte_supported_shift
static inline int arch_vmap_pte_supported_shift(unsigned long size)
{
	return PAGE_SHIFT;
}
#endif

#ifndef arch_vmap_pgprot_tagged
static inline pgprot_t arch_vmap_pgprot_tagged(pgprot_t prot)
{
	return prot;
}
#endif

/*
 *	Highlevel APIs for driver use
 */
extern void vm_unmap_ram(const void *mem, unsigned int count);
extern void *vm_map_ram(struct page **pages, unsigned int count, int node);
extern void vm_unmap_aliases(void);

#ifdef CONFIG_MMU
extern unsigned long vmalloc_nr_pages(void);
#else
static inline unsigned long vmalloc_nr_pages(void) { return 0; }
#endif

extern void *vmalloc_noprof(unsigned long size) __alloc_size(1);
#define vmalloc(...)		alloc_hooks(vmalloc_noprof(__VA_ARGS__))

extern void *vzalloc_noprof(unsigned long size) __alloc_size(1);
#define vzalloc(...)		alloc_hooks(vzalloc_noprof(__VA_ARGS__))

extern void *vmalloc_user_noprof(unsigned long size) __alloc_size(1);
#define vmalloc_user(...)	alloc_hooks(vmalloc_user_noprof(__VA_ARGS__))

extern void *vmalloc_node_noprof(unsigned long size, int node) __alloc_size(1);
#define vmalloc_node(...)	alloc_hooks(vmalloc_node_noprof(__VA_ARGS__))

extern void *vzalloc_node_noprof(unsigned long size, int node) __alloc_size(1);
#define vzalloc_node(...)	alloc_hooks(vzalloc_node_noprof(__VA_ARGS__))

extern void *vmalloc_32_noprof(unsigned long size) __alloc_size(1);
#define vmalloc_32(...)		alloc_hooks(vmalloc_32_noprof(__VA_ARGS__))

extern void *vmalloc_32_user_noprof(unsigned long size) __alloc_size(1);
#define vmalloc_32_user(...)	alloc_hooks(vmalloc_32_user_noprof(__VA_ARGS__))

extern void *__vmalloc_noprof(unsigned long size, gfp_t gfp_mask) __alloc_size(1);
#define __vmalloc(...)		alloc_hooks(__vmalloc_noprof(__VA_ARGS__))

extern void *__vmalloc_node_range_noprof(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) __alloc_size(1);
#define __vmalloc_node_range(...)	alloc_hooks(__vmalloc_node_range_noprof(__VA_ARGS__))

void *__vmalloc_node_noprof(unsigned long size, unsigned long align, gfp_t gfp_mask,
		int node, const void *caller) __alloc_size(1);
#define __vmalloc_node(...)	alloc_hooks(__vmalloc_node_noprof(__VA_ARGS__))

void *vmalloc_huge_noprof(unsigned long size, gfp_t gfp_mask) __alloc_size(1);
#define vmalloc_huge(...)	alloc_hooks(vmalloc_huge_noprof(__VA_ARGS__))

extern void *__vmalloc_array_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
#define __vmalloc_array(...)	alloc_hooks(__vmalloc_array_noprof(__VA_ARGS__))

extern void *vmalloc_array_noprof(size_t n, size_t size) __alloc_size(1, 2);
#define vmalloc_array(...)	alloc_hooks(vmalloc_array_noprof(__VA_ARGS__))

extern void *__vcalloc_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
#define __vcalloc(...)		alloc_hooks(__vcalloc_noprof(__VA_ARGS__))

extern void *vcalloc_noprof(size_t n, size_t size) __alloc_size(1, 2);
#define vcalloc(...)		alloc_hooks(vcalloc_noprof(__VA_ARGS__))

void * __must_check vrealloc_noprof(const void *p, size_t size, gfp_t flags)
		__realloc_size(2);
#define vrealloc(...)		alloc_hooks(vrealloc_noprof(__VA_ARGS__))

extern void vfree(const void *addr);
extern void vfree_atomic(const void *addr);

extern void *vmap(struct page **pages, unsigned int count,
			unsigned long flags, pgprot_t prot);
void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot);
extern void vunmap(const void *addr);

extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
				       unsigned long uaddr, void *kaddr,
				       unsigned long pgoff, unsigned long size);

extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
							unsigned long pgoff);

/*
 * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values
 * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings()
 * needs to be called.
 */
#ifndef ARCH_PAGE_TABLE_SYNC_MASK
#define ARCH_PAGE_TABLE_SYNC_MASK 0
#endif

/*
 * There is no default implementation for arch_sync_kernel_mappings(). It is
 * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK
 * is 0.
 */
void arch_sync_kernel_mappings(unsigned long start, unsigned long end);

/*
 *	Lowlevel-APIs (not for driver use!)
 */

static inline size_t get_vm_area_size(const struct vm_struct *area)
{
	if (!(area->flags & VM_NO_GUARD))
		/* return actual size without guard page */
		return area->size - PAGE_SIZE;
	else
		return area->size;

}

extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
extern struct vm_struct *get_vm_area_caller(unsigned long size,
					unsigned long flags, const void *caller);
extern struct vm_struct *__get_vm_area_caller(unsigned long size,
					unsigned long flags,
					unsigned long start, unsigned long end,
					const void *caller);
void free_vm_area(struct vm_struct *area);
extern struct vm_struct *remove_vm_area(const void *addr);
extern struct vm_struct *find_vm_area(const void *addr);
struct vmap_area *find_vmap_area(unsigned long addr);

static inline bool is_vm_area_hugepages(const void *addr)
{
	/*
	 * This may not 100% tell if the area is mapped with > PAGE_SIZE
	 * page table entries, if for some reason the architecture indicates
	 * larger sizes are available but decides not to use them, nothing
	 * prevents that. This only indicates the size of the physical page
	 * allocated in the vmalloc layer.
	 */
#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
	return find_vm_area(addr)->page_order > 0;
#else
	return false;
#endif
}

#ifdef CONFIG_MMU
int vm_area_map_pages(struct vm_struct *area, unsigned long start,
		      unsigned long end, struct page **pages);
void vm_area_unmap_pages(struct vm_struct *area, unsigned long start,
			 unsigned long end);
void vunmap_range(unsigned long addr, unsigned long end);
static inline void set_vm_flush_reset_perms(void *addr)
{
	struct vm_struct *vm = find_vm_area(addr);

	if (vm)
		vm->flags |= VM_FLUSH_RESET_PERMS;
}

#else
static inline void set_vm_flush_reset_perms(void *addr)
{
}
#endif

/* for /proc/kcore */
extern long vread_iter(struct iov_iter *iter, const char *addr, size_t count);

/*
 *	Internals.  Don't use..
 */
extern __init void vm_area_add_early(struct vm_struct *vm);
extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);

#ifdef CONFIG_SMP
# ifdef CONFIG_MMU
struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
				     const size_t *sizes, int nr_vms,
				     size_t align);

void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
# else
static inline struct vm_struct **
pcpu_get_vm_areas(const unsigned long *offsets,
		const size_t *sizes, int nr_vms,
		size_t align)
{
	return NULL;
}

static inline void
pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
{
}
# endif
#endif

#ifdef CONFIG_MMU
#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
#else
#define VMALLOC_TOTAL 0UL
#endif

int register_vmap_purge_notifier(struct notifier_block *nb);
int unregister_vmap_purge_notifier(struct notifier_block *nb);

#if defined(CONFIG_MMU) && defined(CONFIG_PRINTK)
bool vmalloc_dump_obj(void *object);
#else
static inline bool vmalloc_dump_obj(void *object) { return false; }
#endif

#endif /* _LINUX_VMALLOC_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_VMALLOC_H
	3	#define _LINUX_VMALLOC_H
	4
88ae5fb7 KO	5	#include <linux/alloc_tag.h>
88ae5fb7 KO	6	#include <linux/sched.h>
1da177e4	7	#include <linux/spinlock.h>
db64fe02	8	#include <linux/init.h>
13ba3fcb	9	#include <linux/list.h>
80c4bd7a	10	#include <linux/llist.h>
1da177e4	11	#include <asm/page.h> /* pgprot_t */
13ba3fcb	12	#include <linux/rbtree.h>
3b3b1a29	13	#include <linux/overflow.h>
1da177e4	14
1f059dfd IM	15	#include <asm/vmalloc.h>
1f059dfd IM	16
605d9288	17	struct vm_area_struct; /* vma defining user mapping in mm_types.h */
4da56b99	18	struct notifier_block; /* in notifier.h */
4c91c07c	19	struct iov_iter; /* in uio.h */
83342314	20
605d9288	21	/* bits in flags of vmalloc's vm_struct below */
20fc02b4 ZY	22	#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
	23	#define VM_ALLOC 0x00000002 /* vmalloc() */
	24	#define VM_MAP 0x00000004 /* vmap()ed pages */
	25	#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
fe9041c2	26	#define VM_DMA_COHERENT 0x00000010 /* dma_alloc_coherent */
20fc02b4	27	#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
bd1a8fb2	28	#define VM_NO_GUARD 0x00000040 /* *DANGEROUS* don't add guard page */
a5af5aa8	29	#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
4f6ec860 RE	30	#define VM_FLUSH_RESET_PERMS 0x00000100 /* reset direct map and flush TLB on unmap, can't be freed in atomic context */
4f6ec860 RE	31	#define VM_MAP_PUT_PAGES 0x00000200 /* put pages and free array in vfree */
559089e0	32	#define VM_ALLOW_HUGE_VMAP 0x00000400 /* Allow for huge pages on archs with HAVE_ARCH_HUGE_VMALLOC */
3c5c3cfb	33
60115fa5 KW	34	#if (defined(CONFIG_KASAN_GENERIC) \|\| defined(CONFIG_KASAN_SW_TAGS)) && \
	35	!defined(CONFIG_KASAN_VMALLOC)
	36	#define VM_DEFER_KMEMLEAK 0x00000800 /* defer kmemleak object creation */
	37	#else
	38	#define VM_DEFER_KMEMLEAK 0
	39	#endif
e6f79822	40	#define VM_SPARSE 0x00001000 /* sparse vm_area. not all pages are present. */
60115fa5	41
1da177e4 LT	42	/* bits [20..32] reserved for arch specific ioremap internals */
1da177e4 LT	43
fd195c49 DS	44	/*
fd195c49 DS	45	* Maximum alignment for ioremap() regions.
f0953a1b	46	* Can be overridden by arch-specific value.
fd195c49 DS	47	*/
	48	#ifndef IOREMAP_MAX_ORDER
	49	#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
	50	#endif
	51
1da177e4	52	struct vm_struct {
2b4ac44e	53	struct vm_struct *next;
1da177e4 LT	54	void *addr;
	55	unsigned long size;
	56	unsigned long flags;
	57	struct page **pages;
121e6f32 NP	58	#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
	59	unsigned int page_order;
	60	#endif
1da177e4	61	unsigned int nr_pages;
ffa71f33	62	phys_addr_t phys_addr;
5e6cafc8	63	const void *caller;
1da177e4 LT	64	};
1da177e4 LT	65
13ba3fcb AK	66	struct vmap_area {
	67	unsigned long va_start;
	68	unsigned long va_end;
68ad4a33	69
13ba3fcb AK	70	struct rb_node rb_node; /* address sorted rbtree */
13ba3fcb AK	71	struct list_head list; /* address sorted list */
688fcbfc PL	72
688fcbfc PL	73	/*
96e2db45 URS	74	* The following two variables can be packed, because
96e2db45 URS	75	* a vmap_area object can be either:
ff11a7ce BL	76	* 1) in "free" tree (root is free_vmap_area_root)
ff11a7ce BL	77	* 2) or "busy" tree (root is vmap_area_root)
688fcbfc PL	78	*/
	79	union {
	80	unsigned long subtree_max_size; /* in "free" tree */
	81	struct vm_struct vm; / in "busy" tree */
688fcbfc	82	};
869176a0	83	unsigned long flags; /* mark type of vm_map_ram area */
13ba3fcb AK	84	};
13ba3fcb AK	85
6f680e70 NP	86	/* archs that select HAVE_ARCH_HUGE_VMAP should override one or more of these */
	87	#ifndef arch_vmap_p4d_supported
	88	static inline bool arch_vmap_p4d_supported(pgprot_t prot)
	89	{
	90	return false;
	91	}
	92	#endif
	93
	94	#ifndef arch_vmap_pud_supported
	95	static inline bool arch_vmap_pud_supported(pgprot_t prot)
	96	{
	97	return false;
	98	}
	99	#endif
	100
	101	#ifndef arch_vmap_pmd_supported
	102	static inline bool arch_vmap_pmd_supported(pgprot_t prot)
	103	{
	104	return false;
	105	}
bbc180a5 NP	106	#endif
bbc180a5 NP	107
f7ee1f13 CL	108	#ifndef arch_vmap_pte_range_map_size
	109	static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr, unsigned long end,
	110	u64 pfn, unsigned int max_page_shift)
	111	{
	112	return PAGE_SIZE;
	113	}
	114	#endif
	115
3382bbee CL	116	#ifndef arch_vmap_pte_supported_shift
	117	static inline int arch_vmap_pte_supported_shift(unsigned long size)
	118	{
	119	return PAGE_SHIFT;
	120	}
	121	#endif
	122
01d92c7f AK	123	#ifndef arch_vmap_pgprot_tagged
	124	static inline pgprot_t arch_vmap_pgprot_tagged(pgprot_t prot)
	125	{
	126	return prot;
	127	}
	128	#endif
	129
1da177e4 LT	130	/*
	131	* Highlevel APIs for driver use
	132	*/
db64fe02	133	extern void vm_unmap_ram(const void *mem, unsigned int count);
d4efd79a	134	extern void vm_map_ram(struct page *pages, unsigned int count, int node);
db64fe02 NP	135	extern void vm_unmap_aliases(void);
	136
	137	#ifdef CONFIG_MMU
97105f0a	138	extern unsigned long vmalloc_nr_pages(void);
db64fe02	139	#else
97105f0a	140	static inline unsigned long vmalloc_nr_pages(void) { return 0; }
db64fe02 NP	141	#endif
db64fe02 NP	142
88ae5fb7 KO	143	extern void *vmalloc_noprof(unsigned long size) __alloc_size(1);
	144	#define vmalloc(...) alloc_hooks(vmalloc_noprof(__VA_ARGS__))
	145
	146	extern void *vzalloc_noprof(unsigned long size) __alloc_size(1);
	147	#define vzalloc(...) alloc_hooks(vzalloc_noprof(__VA_ARGS__))
	148
	149	extern void *vmalloc_user_noprof(unsigned long size) __alloc_size(1);
	150	#define vmalloc_user(...) alloc_hooks(vmalloc_user_noprof(__VA_ARGS__))
	151
	152	extern void *vmalloc_node_noprof(unsigned long size, int node) __alloc_size(1);
	153	#define vmalloc_node(...) alloc_hooks(vmalloc_node_noprof(__VA_ARGS__))
	154
	155	extern void *vzalloc_node_noprof(unsigned long size, int node) __alloc_size(1);
	156	#define vzalloc_node(...) alloc_hooks(vzalloc_node_noprof(__VA_ARGS__))
	157
	158	extern void *vmalloc_32_noprof(unsigned long size) __alloc_size(1);
	159	#define vmalloc_32(...) alloc_hooks(vmalloc_32_noprof(__VA_ARGS__))
	160
	161	extern void *vmalloc_32_user_noprof(unsigned long size) __alloc_size(1);
	162	#define vmalloc_32_user(...) alloc_hooks(vmalloc_32_user_noprof(__VA_ARGS__))
	163
	164	extern void *__vmalloc_noprof(unsigned long size, gfp_t gfp_mask) __alloc_size(1);
	165	#define __vmalloc(...) alloc_hooks(__vmalloc_noprof(__VA_ARGS__))
	166
	167	extern void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,
d0a21265	168	unsigned long start, unsigned long end, gfp_t gfp_mask,
cb9e3c29	169	pgprot_t prot, unsigned long vm_flags, int node,
894f24bb	170	const void *caller) __alloc_size(1);
88ae5fb7 KO	171	#define __vmalloc_node_range(...) alloc_hooks(__vmalloc_node_range_noprof(__VA_ARGS__))
	172
	173	void *__vmalloc_node_noprof(unsigned long size, unsigned long align, gfp_t gfp_mask,
894f24bb	174	int node, const void *caller) __alloc_size(1);
88ae5fb7 KO	175	#define __vmalloc_node(...) alloc_hooks(__vmalloc_node_noprof(__VA_ARGS__))
	176
	177	void *vmalloc_huge_noprof(unsigned long size, gfp_t gfp_mask) __alloc_size(1);
	178	#define vmalloc_huge(...) alloc_hooks(vmalloc_huge_noprof(__VA_ARGS__))
	179
	180	extern void *__vmalloc_array_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
	181	#define __vmalloc_array(...) alloc_hooks(__vmalloc_array_noprof(__VA_ARGS__))
	182
	183	extern void *vmalloc_array_noprof(size_t n, size_t size) __alloc_size(1, 2);
	184	#define vmalloc_array(...) alloc_hooks(vmalloc_array_noprof(__VA_ARGS__))
	185
	186	extern void *__vcalloc_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
	187	#define __vcalloc(...) alloc_hooks(__vcalloc_noprof(__VA_ARGS__))
cb9e3c29	188
88ae5fb7 KO	189	extern void *vcalloc_noprof(size_t n, size_t size) __alloc_size(1, 2);
88ae5fb7 KO	190	#define vcalloc(...) alloc_hooks(vcalloc_noprof(__VA_ARGS__))
a8749a35	191
3ddc2fef DK	192	void * __must_check vrealloc_noprof(const void *p, size_t size, gfp_t flags)
	193	__realloc_size(2);
	194	#define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__))
	195
b3bdda02	196	extern void vfree(const void *addr);
bf22e37a	197	extern void vfree_atomic(const void *addr);
1da177e4 LT	198
	199	extern void vmap(struct page *pages, unsigned int count,
	200	unsigned long flags, pgprot_t prot);
3e9a9e25	201	void vmap_pfn(unsigned long pfns, unsigned int count, pgprot_t prot);
b3bdda02	202	extern void vunmap(const void *addr);
83342314	203
e69e9d4a HD	204	extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
e69e9d4a HD	205	unsigned long uaddr, void *kaddr,
bdebd6a2	206	unsigned long pgoff, unsigned long size);
e69e9d4a	207
83342314 NP	208	extern int remap_vmalloc_range(struct vm_area_struct vma, void addr,
83342314 NP	209	unsigned long pgoff);
763802b5	210
2ba3e694 JR	211	/*
	212	* Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values
	213	* and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings()
	214	* needs to be called.
	215	*/
	216	#ifndef ARCH_PAGE_TABLE_SYNC_MASK
	217	#define ARCH_PAGE_TABLE_SYNC_MASK 0
	218	#endif
	219
	220	/*
	221	* There is no default implementation for arch_sync_kernel_mappings(). It is
	222	* relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK
	223	* is 0.
	224	*/
	225	void arch_sync_kernel_mappings(unsigned long start, unsigned long end);
	226
1da177e4 LT	227	/*
	228	* Lowlevel-APIs (not for driver use!)
	229	*/
9585116b JF	230
	231	static inline size_t get_vm_area_size(const struct vm_struct *area)
	232	{
71394fe5 AR	233	if (!(area->flags & VM_NO_GUARD))
	234	/* return actual size without guard page */
	235	return area->size - PAGE_SIZE;
	236	else
	237	return area->size;
	238
9585116b JF	239	}
9585116b JF	240
1da177e4	241	extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
23016969	242	extern struct vm_struct *get_vm_area_caller(unsigned long size,
5e6cafc8	243	unsigned long flags, const void *caller);
c2968612 BH	244	extern struct vm_struct *__get_vm_area_caller(unsigned long size,
	245	unsigned long flags,
	246	unsigned long start, unsigned long end,
5e6cafc8	247	const void *caller);
301fa9f2	248	void free_vm_area(struct vm_struct *area);
b3bdda02	249	extern struct vm_struct remove_vm_area(const void addr);
e9da6e99	250	extern struct vm_struct find_vm_area(const void addr);
993d0b28	251	struct vmap_area *find_vmap_area(unsigned long addr);
c19c03fc	252
121e6f32 NP	253	static inline bool is_vm_area_hugepages(const void *addr)
	254	{
	255	/*
	256	* This may not 100% tell if the area is mapped with > PAGE_SIZE
	257	* page table entries, if for some reason the architecture indicates
	258	* larger sizes are available but decides not to use them, nothing
	259	* prevents that. This only indicates the size of the physical page
	260	* allocated in the vmalloc layer.
	261	*/
	262	#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
	263	return find_vm_area(addr)->page_order > 0;
	264	#else
	265	return false;
	266	#endif
	267	}
	268
b554cb42	269	#ifdef CONFIG_MMU
e6f79822 AS	270	int vm_area_map_pages(struct vm_struct *area, unsigned long start,
	271	unsigned long end, struct page **pages);
	272	void vm_area_unmap_pages(struct vm_struct *area, unsigned long start,
	273	unsigned long end);
4ad0ae8c	274	void vunmap_range(unsigned long addr, unsigned long end);
868b104d RE	275	static inline void set_vm_flush_reset_perms(void *addr)
	276	{
	277	struct vm_struct *vm = find_vm_area(addr);
	278
	279	if (vm)
	280	vm->flags \|= VM_FLUSH_RESET_PERMS;
	281	}
121e6f32	282
b554cb42	283	#else
868b104d RE	284	static inline void set_vm_flush_reset_perms(void *addr)
	285	{
	286	}
b554cb42	287	#endif
1da177e4	288
bbcd53c9	289	/* for /proc/kcore */
4c91c07c	290	extern long vread_iter(struct iov_iter iter, const char addr, size_t count);
69beeb1d	291
1da177e4	292	/*
06c88398	293	* Internals. Don't use..
1da177e4	294	*/
be9b7335	295	extern __init void vm_area_add_early(struct vm_struct *vm);
c0c0a293	296	extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
1da177e4	297
4f8b02b4	298	#ifdef CONFIG_SMP
b554cb42	299	# ifdef CONFIG_MMU
ca23e405 TH	300	struct vm_struct *pcpu_get_vm_areas(const unsigned long offsets,
ca23e405 TH	301	const size_t *sizes, int nr_vms,
ec3f64fc	302	size_t align);
ca23e405 TH	303
ca23e405 TH	304	void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
b554cb42 GY	305	# else
	306	static inline struct vm_struct **
	307	pcpu_get_vm_areas(const unsigned long *offsets,
	308	const size_t *sizes, int nr_vms,
	309	size_t align)
	310	{
	311	return NULL;
	312	}
	313
	314	static inline void
	315	pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
	316	{
	317	}
	318	# endif
4f8b02b4	319	#endif
ca23e405	320
db3808c1 JK	321	#ifdef CONFIG_MMU
db3808c1 JK	322	#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
db3808c1	323	#else
db3808c1	324	#define VMALLOC_TOTAL 0UL
db3808c1 JK	325	#endif
db3808c1 JK	326
4da56b99 CW	327	int register_vmap_purge_notifier(struct notifier_block *nb);
	328	int unregister_vmap_purge_notifier(struct notifier_block *nb);
	329
5bb1bb35	330	#if defined(CONFIG_MMU) && defined(CONFIG_PRINTK)
98f18083 PM	331	bool vmalloc_dump_obj(void *object);
	332	#else
	333	static inline bool vmalloc_dump_obj(void *object) { return false; }
	334	#endif
	335
1da177e4	336	#endif /* _LINUX_VMALLOC_H */