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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_VMALLOC_H
2#define _LINUX_VMALLOC_H
3
4#include <linux/spinlock.h>
Nick Piggindb64fe02008-10-18 20:27:03 -07005#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <asm/page.h> /* pgprot_t */
7
Hugh Dickins605d9282008-08-16 11:07:21 +01008struct vm_area_struct; /* vma defining user mapping in mm_types.h */
Nick Piggin83342312006-06-23 02:03:20 -07009
Jeremy Fitzhardingea0d40c82010-03-26 15:28:51 -070010extern bool vmap_lazy_unmap;
11
Hugh Dickins605d9282008-08-16 11:07:21 +010012/* bits in flags of vmalloc's vm_struct below */
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
14#define VM_ALLOC 0x00000002 /* vmalloc() */
15#define VM_MAP 0x00000004 /* vmap()ed pages */
Nick Piggin83342312006-06-23 02:03:20 -070016#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
Jan Kiszka8757d5f2006-07-14 00:23:56 -070017#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018/* bits [20..32] reserved for arch specific ioremap internals */
19
Deepak Saxenafd195c42005-09-03 15:54:58 -070020/*
21 * Maximum alignment for ioremap() regions.
22 * Can be overriden by arch-specific value.
23 */
24#ifndef IOREMAP_MAX_ORDER
25#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
26#endif
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028struct vm_struct {
Eric Dumazet2b4ac442006-11-10 12:27:48 -080029 struct vm_struct *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 void *addr;
31 unsigned long size;
32 unsigned long flags;
33 struct page **pages;
34 unsigned int nr_pages;
Kenji Kaneshigeffa71f32010-06-18 12:22:40 +090035 phys_addr_t phys_addr;
Christoph Lameter23016962008-04-28 02:12:42 -070036 void *caller;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037};
38
39/*
40 * Highlevel APIs for driver use
41 */
Nick Piggindb64fe02008-10-18 20:27:03 -070042extern void vm_unmap_ram(const void *mem, unsigned int count);
43extern void *vm_map_ram(struct page **pages, unsigned int count,
44 int node, pgprot_t prot);
45extern void vm_unmap_aliases(void);
46
47#ifdef CONFIG_MMU
48extern void __init vmalloc_init(void);
49#else
50static inline void vmalloc_init(void)
51{
52}
53#endif
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055extern void *vmalloc(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070056extern void *vmalloc_user(unsigned long size);
Christoph Lameter930fc452005-10-29 18:15:41 -070057extern void *vmalloc_node(unsigned long size, int node);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058extern void *vmalloc_exec(unsigned long size);
59extern void *vmalloc_32(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070060extern void *vmalloc_32_user(unsigned long size);
Al Virodd0fc662005-10-07 07:46:04 +010061extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
Christoph Lameter930fc452005-10-29 18:15:41 -070062extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
63 pgprot_t prot);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080064extern void vfree(const void *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66extern void *vmap(struct page **pages, unsigned int count,
67 unsigned long flags, pgprot_t prot);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080068extern void vunmap(const void *addr);
Nick Piggin83342312006-06-23 02:03:20 -070069
70extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
71 unsigned long pgoff);
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -070072void vmalloc_sync_all(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74/*
75 * Lowlevel-APIs (not for driver use!)
76 */
Jeremy Fitzhardinge95851162007-07-21 17:11:35 +020077
78static inline size_t get_vm_area_size(const struct vm_struct *area)
79{
80 /* return actual size without guard page */
81 return area->size - PAGE_SIZE;
82}
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
Christoph Lameter23016962008-04-28 02:12:42 -070085extern struct vm_struct *get_vm_area_caller(unsigned long size,
86 unsigned long flags, void *caller);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
88 unsigned long start, unsigned long end);
Benjamin Herrenschmidtc2968612009-02-18 14:48:12 -080089extern struct vm_struct *__get_vm_area_caller(unsigned long size,
90 unsigned long flags,
91 unsigned long start, unsigned long end,
92 void *caller);
Christoph Lameter930fc452005-10-29 18:15:41 -070093extern struct vm_struct *get_vm_area_node(unsigned long size,
Giridhar Pemmasani52fd24c2006-10-28 10:38:34 -070094 unsigned long flags, int node,
95 gfp_t gfp_mask);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080096extern struct vm_struct *remove_vm_area(const void *addr);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +100097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
99 struct page ***pages);
Tejun Heo8fc48982009-02-20 16:29:08 +0900100extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
101 pgprot_t prot, struct page **pages);
102extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +1000103extern void unmap_kernel_range(unsigned long addr, unsigned long size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Jeremy Fitzhardinge5f4352f2007-07-17 18:37:04 -0700105/* Allocate/destroy a 'vmalloc' VM area. */
106extern struct vm_struct *alloc_vm_area(size_t size);
107extern void free_vm_area(struct vm_struct *area);
108
KOSAKI Motohiro69beeb12009-01-06 14:39:46 -0800109/* for /dev/kmem */
110extern long vread(char *buf, char *addr, unsigned long count);
111extern long vwrite(char *buf, char *addr, unsigned long count);
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113/*
114 * Internals. Dont't use..
115 */
116extern rwlock_t vmlist_lock;
117extern struct vm_struct *vmlist;
Tejun Heoc0c0a292009-02-24 11:57:21 +0900118extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Tejun Heo4f8b02b2010-09-03 18:22:47 +0200120#ifdef CONFIG_SMP
Tejun Heoca23e402009-08-14 15:00:52 +0900121struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
122 const size_t *sizes, int nr_vms,
123 size_t align, gfp_t gfp_mask);
124
125void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
Tejun Heo4f8b02b2010-09-03 18:22:47 +0200126#endif
Tejun Heoca23e402009-08-14 15:00:52 +0900127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128#endif /* _LINUX_VMALLOC_H */