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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
Hugh Dickins605d9282008-08-16 11:07:21 +010010/* bits in flags of vmalloc's vm_struct below */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
12#define VM_ALLOC 0x00000002 /* vmalloc() */
13#define VM_MAP 0x00000004 /* vmap()ed pages */
Nick Piggin83342312006-06-23 02:03:20 -070014#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
Jan Kiszka8757d5f2006-07-14 00:23:56 -070015#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
Mitsuo Hayasakaf5252e02011-10-31 17:08:13 -070016#define VM_UNLIST 0x00000020 /* vm_struct is not listed in vmlist */
Linus Torvalds1da177e2005-04-16 15:20:36 -070017/* bits [20..32] reserved for arch specific ioremap internals */
18
Deepak Saxenafd195c42005-09-03 15:54:58 -070019/*
20 * Maximum alignment for ioremap() regions.
21 * Can be overriden by arch-specific value.
22 */
23#ifndef IOREMAP_MAX_ORDER
24#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
25#endif
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027struct vm_struct {
Eric Dumazet2b4ac442006-11-10 12:27:48 -080028 struct vm_struct *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 void *addr;
30 unsigned long size;
31 unsigned long flags;
32 struct page **pages;
33 unsigned int nr_pages;
Kenji Kaneshigeffa71f32010-06-18 12:22:40 +090034 phys_addr_t phys_addr;
Marek Szyprowski5e6cafc2012-04-13 12:32:09 +020035 const void *caller;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036};
37
38/*
39 * Highlevel APIs for driver use
40 */
Nick Piggindb64fe02008-10-18 20:27:03 -070041extern void vm_unmap_ram(const void *mem, unsigned int count);
42extern void *vm_map_ram(struct page **pages, unsigned int count,
43 int node, pgprot_t prot);
44extern void vm_unmap_aliases(void);
45
46#ifdef CONFIG_MMU
47extern void __init vmalloc_init(void);
48#else
49static inline void vmalloc_init(void)
50{
51}
52#endif
53
Linus Torvalds1da177e2005-04-16 15:20:36 -070054extern void *vmalloc(unsigned long size);
Dave Younge1ca7782010-10-26 14:22:06 -070055extern void *vzalloc(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);
Dave Younge1ca7782010-10-26 14:22:06 -070058extern void *vzalloc_node(unsigned long size, int node);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059extern void *vmalloc_exec(unsigned long size);
60extern void *vmalloc_32(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070061extern void *vmalloc_32_user(unsigned long size);
Al Virodd0fc662005-10-07 07:46:04 +010062extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
David Rientjesd0a21262011-01-13 15:46:02 -080063extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
64 unsigned long start, unsigned long end, gfp_t gfp_mask,
Marek Szyprowski5e6cafc2012-04-13 12:32:09 +020065 pgprot_t prot, int node, const void *caller);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080066extern void vfree(const void *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68extern void *vmap(struct page **pages, unsigned int count,
69 unsigned long flags, pgprot_t prot);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080070extern void vunmap(const void *addr);
Nick Piggin83342312006-06-23 02:03:20 -070071
72extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
73 unsigned long pgoff);
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -070074void vmalloc_sync_all(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76/*
77 * Lowlevel-APIs (not for driver use!)
78 */
Jeremy Fitzhardinge95851162007-07-21 17:11:35 +020079
80static inline size_t get_vm_area_size(const struct vm_struct *area)
81{
82 /* return actual size without guard page */
83 return area->size - PAGE_SIZE;
84}
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
Christoph Lameter23016962008-04-28 02:12:42 -070087extern struct vm_struct *get_vm_area_caller(unsigned long size,
Marek Szyprowski5e6cafc2012-04-13 12:32:09 +020088 unsigned long flags, const void *caller);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
90 unsigned long start, unsigned long end);
Benjamin Herrenschmidtc2968612009-02-18 14:48:12 -080091extern struct vm_struct *__get_vm_area_caller(unsigned long size,
92 unsigned long flags,
93 unsigned long start, unsigned long end,
Marek Szyprowski5e6cafc2012-04-13 12:32:09 +020094 const void *caller);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080095extern struct vm_struct *remove_vm_area(const void *addr);
Marek Szyprowskie9da6e92012-07-30 09:11:33 +020096extern struct vm_struct *find_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);
Graf Yangb554cb42011-03-28 12:53:29 +0100100#ifdef CONFIG_MMU
Tejun Heo8fc48982009-02-20 16:29:08 +0900101extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
102 pgprot_t prot, struct page **pages);
103extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +1000104extern void unmap_kernel_range(unsigned long addr, unsigned long size);
Graf Yangb554cb42011-03-28 12:53:29 +0100105#else
106static inline int
107map_kernel_range_noflush(unsigned long start, unsigned long size,
108 pgprot_t prot, struct page **pages)
109{
110 return size >> PAGE_SHIFT;
111}
112static inline void
113unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
114{
115}
116static inline void
117unmap_kernel_range(unsigned long addr, unsigned long size)
118{
119}
120#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Jeremy Fitzhardinge5f4352f2007-07-17 18:37:04 -0700122/* Allocate/destroy a 'vmalloc' VM area. */
David Vrabelcd129092011-09-29 16:53:32 +0100123extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
Jeremy Fitzhardinge5f4352f2007-07-17 18:37:04 -0700124extern void free_vm_area(struct vm_struct *area);
125
KOSAKI Motohiro69beeb1d2009-01-06 14:39:46 -0800126/* for /dev/kmem */
127extern long vread(char *buf, char *addr, unsigned long count);
128extern long vwrite(char *buf, char *addr, unsigned long count);
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/*
131 * Internals. Dont't use..
132 */
133extern rwlock_t vmlist_lock;
134extern struct vm_struct *vmlist;
Nicolas Pitrebe9b7332011-08-25 00:24:21 -0400135extern __init void vm_area_add_early(struct vm_struct *vm);
Tejun Heoc0c0a292009-02-24 11:57:21 +0900136extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Tejun Heo4f8b02b2010-09-03 18:22:47 +0200138#ifdef CONFIG_SMP
Graf Yangb554cb42011-03-28 12:53:29 +0100139# ifdef CONFIG_MMU
Tejun Heoca23e402009-08-14 15:00:52 +0900140struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
141 const size_t *sizes, int nr_vms,
David Rientjesec3f64f2011-01-13 15:46:01 -0800142 size_t align);
Tejun Heoca23e402009-08-14 15:00:52 +0900143
144void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
Graf Yangb554cb42011-03-28 12:53:29 +0100145# else
146static inline struct vm_struct **
147pcpu_get_vm_areas(const unsigned long *offsets,
148 const size_t *sizes, int nr_vms,
149 size_t align)
150{
151 return NULL;
152}
153
154static inline void
155pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
156{
157}
158# endif
Tejun Heo4f8b02b2010-09-03 18:22:47 +0200159#endif
Tejun Heoca23e402009-08-14 15:00:52 +0900160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161#endif /* _LINUX_VMALLOC_H */