[people/ms/linux.git] / include / linux / vmalloc.h

#ifndef _LINUX_VMALLOC_H
#define _LINUX_VMALLOC_H

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

struct vm_area_struct;		/* vma defining user mapping in mm_types.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_VPAGES		0x00000010	/* buffer for pages was vmalloc'ed */
#define VM_UNINITIALIZED	0x00000020	/* vm_struct is not fully initialized */

#if defined(CONFIG_X86) && defined(CONFIG_PAX_KERNEXEC)
#define VM_KERNEXEC		0x00000040	/* allocate from executable kernel memory range */
#endif

/* 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 list_head 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)
{
}
#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, int node, const void *caller);
extern void vfree(const void *addr);

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

#ifdef CONFIG_GRKERNSEC_KSTACKOVERFLOW
extern void unmap_process_stacks(struct task_struct *task);
#endif

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)
{
	/* return actual size without guard page */
	return area->size - PAGE_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(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;
}
static inline void
unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
{
}
static inline void
unmap_kernel_range(unsigned long addr, unsigned long size)
{
}
#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) __size_overflow(3);

/*
 *	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;
}

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

struct vmalloc_info {
	unsigned long   used;
	unsigned long   largest_chunk;
};

#ifdef CONFIG_MMU
#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
extern void get_vmalloc_info(struct vmalloc_info *vmi);
#else

#define VMALLOC_TOTAL 0UL
#define get_vmalloc_info(vmi)			\
do {						\
	(vmi)->used = 0;			\
	(vmi)->largest_chunk = 0;		\
} while (0)
#endif

#endif /* _LINUX_VMALLOC_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_VMALLOC_H
	2	#define _LINUX_VMALLOC_H
	3
	4	#include <linux/spinlock.h>
db64fe02	5	#include <linux/init.h>
13ba3fcb	6	#include <linux/list.h>
1da177e4	7	#include <asm/page.h> /* pgprot_t */
13ba3fcb	8	#include <linux/rbtree.h>
1da177e4	9
605d9288	10	struct vm_area_struct; /* vma defining user mapping in mm_types.h */
83342314	11
605d9288	12	/* bits in flags of vmalloc's vm_struct below */
20fc02b4 ZY	13	#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
	14	#define VM_ALLOC 0x00000002 /* vmalloc() */
	15	#define VM_MAP 0x00000004 /* vmap()ed pages */
	16	#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
	17	#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
	18	#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
63d9c273 MT	19
	20	#if defined(CONFIG_X86) && defined(CONFIG_PAX_KERNEXEC)
	21	#define VM_KERNEXEC 0x00000040 /* allocate from executable kernel memory range */
	22	#endif
	23
1da177e4 LT	24	/* bits [20..32] reserved for arch specific ioremap internals */
1da177e4 LT	25
fd195c49 DS	26	/*
	27	* Maximum alignment for ioremap() regions.
	28	* Can be overriden by arch-specific value.
	29	*/
	30	#ifndef IOREMAP_MAX_ORDER
	31	#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
	32	#endif
	33
1da177e4	34	struct vm_struct {
2b4ac44e	35	struct vm_struct *next;
1da177e4 LT	36	void *addr;
	37	unsigned long size;
	38	unsigned long flags;
	39	struct page **pages;
	40	unsigned int nr_pages;
ffa71f33	41	phys_addr_t phys_addr;
5e6cafc8	42	const void *caller;
1da177e4 LT	43	};
1da177e4 LT	44
13ba3fcb AK	45	struct vmap_area {
	46	unsigned long va_start;
	47	unsigned long va_end;
	48	unsigned long flags;
	49	struct rb_node rb_node; /* address sorted rbtree */
	50	struct list_head list; /* address sorted list */
	51	struct list_head purge_list; /* "lazy purge" list */
	52	struct vm_struct *vm;
	53	struct rcu_head rcu_head;
	54	};
	55
1da177e4 LT	56	/*
	57	* Highlevel APIs for driver use
	58	*/
db64fe02 NP	59	extern void vm_unmap_ram(const void *mem, unsigned int count);
	60	extern void vm_map_ram(struct page *pages, unsigned int count,
	61	int node, pgprot_t prot);
	62	extern void vm_unmap_aliases(void);
	63
	64	#ifdef CONFIG_MMU
	65	extern void __init vmalloc_init(void);
	66	#else
	67	static inline void vmalloc_init(void)
	68	{
	69	}
	70	#endif
	71
1da177e4	72	extern void *vmalloc(unsigned long size);
e1ca7788	73	extern void *vzalloc(unsigned long size);
83342314	74	extern void *vmalloc_user(unsigned long size);
930fc45a	75	extern void *vmalloc_node(unsigned long size, int node);
e1ca7788	76	extern void *vzalloc_node(unsigned long size, int node);
1da177e4 LT	77	extern void *vmalloc_exec(unsigned long size);
1da177e4 LT	78	extern void *vmalloc_32(unsigned long size);
83342314	79	extern void *vmalloc_32_user(unsigned long size);
dd0fc66f	80	extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
d0a21265 DR	81	extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
d0a21265 DR	82	unsigned long start, unsigned long end, gfp_t gfp_mask,
5e6cafc8	83	pgprot_t prot, int node, const void *caller);
b3bdda02	84	extern void vfree(const void *addr);
1da177e4 LT	85
	86	extern void vmap(struct page *pages, unsigned int count,
	87	unsigned long flags, pgprot_t prot);
b3bdda02	88	extern void vunmap(const void *addr);
83342314	89
63d9c273 MT	90	#ifdef CONFIG_GRKERNSEC_KSTACKOVERFLOW
	91	extern void unmap_process_stacks(struct task_struct *task);
	92	#endif
	93
e69e9d4a HD	94	extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
	95	unsigned long uaddr, void *kaddr,
	96	unsigned long size);
	97
83342314 NP	98	extern int remap_vmalloc_range(struct vm_area_struct vma, void addr,
83342314 NP	99	unsigned long pgoff);
1eeb66a1	100	void vmalloc_sync_all(void);
1da177e4 LT	101
	102	/*
	103	* Lowlevel-APIs (not for driver use!)
	104	*/
9585116b JF	105
	106	static inline size_t get_vm_area_size(const struct vm_struct *area)
	107	{
	108	/* return actual size without guard page */
	109	return area->size - PAGE_SIZE;
	110	}
	111
1da177e4	112	extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
23016969	113	extern struct vm_struct *get_vm_area_caller(unsigned long size,
5e6cafc8	114	unsigned long flags, const void *caller);
1da177e4 LT	115	extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
1da177e4 LT	116	unsigned long start, unsigned long end);
c2968612 BH	117	extern struct vm_struct *__get_vm_area_caller(unsigned long size,
	118	unsigned long flags,
	119	unsigned long start, unsigned long end,
5e6cafc8	120	const void *caller);
b3bdda02	121	extern struct vm_struct remove_vm_area(const void addr);
e9da6e99	122	extern struct vm_struct find_vm_area(const void addr);
c19c03fc	123
1da177e4	124	extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
f6f8ed47	125	struct page **pages);
b554cb42	126	#ifdef CONFIG_MMU
8fc48985 TH	127	extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
	128	pgprot_t prot, struct page **pages);
	129	extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
c19c03fc	130	extern void unmap_kernel_range(unsigned long addr, unsigned long size);
b554cb42 GY	131	#else
	132	static inline int
	133	map_kernel_range_noflush(unsigned long start, unsigned long size,
	134	pgprot_t prot, struct page **pages)
	135	{
	136	return size >> PAGE_SHIFT;
	137	}
	138	static inline void
	139	unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
	140	{
	141	}
	142	static inline void
	143	unmap_kernel_range(unsigned long addr, unsigned long size)
	144	{
	145	}
	146	#endif
1da177e4	147
5f4352fb	148	/* Allocate/destroy a 'vmalloc' VM area. */
cd12909c	149	extern struct vm_struct alloc_vm_area(size_t size, pte_t *ptes);
5f4352fb JF	150	extern void free_vm_area(struct vm_struct *area);
5f4352fb JF	151
69beeb1d KM	152	/* for /dev/kmem */
69beeb1d KM	153	extern long vread(char buf, char addr, unsigned long count);
63d9c273	154	extern long vwrite(char buf, char addr, unsigned long count) __size_overflow(3);
69beeb1d	155
1da177e4 LT	156	/*
	157	* Internals. Dont't use..
	158	*/
f1c4069e	159	extern struct list_head vmap_area_list;
be9b7335	160	extern __init void vm_area_add_early(struct vm_struct *vm);
c0c0a293	161	extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
1da177e4	162
4f8b02b4	163	#ifdef CONFIG_SMP
b554cb42	164	# ifdef CONFIG_MMU
ca23e405 TH	165	struct vm_struct *pcpu_get_vm_areas(const unsigned long offsets,
ca23e405 TH	166	const size_t *sizes, int nr_vms,
ec3f64fc	167	size_t align);
ca23e405 TH	168
ca23e405 TH	169	void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
b554cb42 GY	170	# else
	171	static inline struct vm_struct **
	172	pcpu_get_vm_areas(const unsigned long *offsets,
	173	const size_t *sizes, int nr_vms,
	174	size_t align)
	175	{
	176	return NULL;
	177	}
	178
	179	static inline void
	180	pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
	181	{
	182	}
	183	# endif
4f8b02b4	184	#endif
ca23e405	185
db3808c1 JK	186	struct vmalloc_info {
	187	unsigned long used;
	188	unsigned long largest_chunk;
	189	};
	190
	191	#ifdef CONFIG_MMU
	192	#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
	193	extern void get_vmalloc_info(struct vmalloc_info *vmi);
	194	#else
	195
	196	#define VMALLOC_TOTAL 0UL
	197	#define get_vmalloc_info(vmi) \
	198	do { \
	199	(vmi)->used = 0; \
	200	(vmi)->largest_chunk = 0; \
	201	} while (0)
	202	#endif
	203
1da177e4	204	#endif /* _LINUX_VMALLOC_H */