Release 4.16 include/linux/vmalloc.h

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

#define _LINUX_VMALLOC_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>

struct vm_area_struct;		/* vma defining user mapping in mm_types.h */
struct notifier_block;		/* in notifier.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_UNINITIALIZED	0x00000020	
/* vm_struct is not fully initialized */

#define VM_NO_GUARD		0x00000040      
/* don't add guard page */

#define VM_KASAN		0x00000080      
/* has allocated kasan shadow memory */
/* bits [20..32] reserved for arch specific ioremap internals */

/*
 * Maximum alignment for ioremap() regions.
 * Can be overriden 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;
	
unsigned int		nr_pages;
	
phys_addr_t		phys_addr;
	
const void		*caller;
};


struct vmap_area {
	
unsigned long va_start;
	
unsigned long va_end;
	
unsigned long flags;
	
struct rb_node rb_node;         /* address sorted rbtree */
	
struct list_head list;          /* address sorted list */
	
struct llist_node purge_list;    /* "lazy purge" list */
	
struct vm_struct *vm;
	
struct rcu_head rcu_head;
};

/*
 *      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, pgprot_t prot);
extern void vm_unmap_aliases(void);

#ifdef CONFIG_MMU
extern void __init vmalloc_init(void);
#else


static inline void vmalloc_init(void)
{
}
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#endif

extern void *vmalloc(unsigned long size);
extern void *vzalloc(unsigned long size);
extern void *vmalloc_user(unsigned long size);
extern void *vmalloc_node(unsigned long size, int node);
extern void *vzalloc_node(unsigned long size, int node);
extern void *vmalloc_exec(unsigned long size);
extern void *vmalloc_32(unsigned long size);
extern void *vmalloc_32_user(unsigned long size);
extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
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);
#ifndef CONFIG_MMU
extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);


static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
						gfp_t flags, void *caller)
{
	return __vmalloc_node_flags(size, node, flags);
}
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#else
extern void *__vmalloc_node_flags_caller(unsigned long size,
					 int node, gfp_t flags, void *caller);
#endif

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);
extern void vunmap(const void *addr);

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

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

}

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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(unsigned long size, unsigned long flags,
					unsigned long start, unsigned long end);
extern struct vm_struct *__get_vm_area_caller(unsigned long size,
					unsigned long flags,
					unsigned long start, unsigned long end,
					const void *caller);
extern struct vm_struct *remove_vm_area(const void *addr);
extern struct vm_struct *find_vm_area(const void *addr);

extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
			struct page **pages);
#ifdef CONFIG_MMU
extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
				    pgprot_t prot, struct page **pages);
extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
extern void unmap_kernel_range(unsigned long addr, unsigned long size);
#else

static inline int

map_kernel_range_noflush(unsigned long start, unsigned long size,
			pgprot_t prot, struct page **pages)
{
	return size >> PAGE_SHIFT;
}
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static inline void

unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
{
}
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static inline void

unmap_kernel_range(unsigned long addr, unsigned long size)
{
}
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#endif

/* Allocate/destroy a 'vmalloc' VM area. */
extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
extern void free_vm_area(struct vm_struct *area);

/* for /dev/kmem */
extern long vread(char *buf, char *addr, unsigned long count);
extern long vwrite(char *buf, char *addr, unsigned long count);

/*
 *      Internals.  Dont't use..
 */
extern struct list_head vmap_area_list;
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;
}

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static inline void

pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
{
}
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# 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);

#endif /* _LINUX_VMALLOC_H */
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Directory: include/linux

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