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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>
Atsushi Kumagai13ba3fc2013-04-29 15:07:40 -07006#include <linux/list.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <asm/page.h> /* pgprot_t */
Atsushi Kumagai13ba3fc2013-04-29 15:07:40 -07008#include <linux/rbtree.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
Hugh Dickins605d9282008-08-16 11:07:21 +010010struct vm_area_struct; /* vma defining user mapping in mm_types.h */
Nick Piggin83342312006-06-23 02:03:20 -070011
Hugh Dickins605d9282008-08-16 11:07:21 +010012/* bits in flags of vmalloc's vm_struct below */
Zhang Yanfei20fc02b2013-07-08 15:59:58 -070013#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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070019/* bits [20..32] reserved for arch specific ioremap internals */
20
Deepak Saxenafd195c42005-09-03 15:54:58 -070021/*
22 * Maximum alignment for ioremap() regions.
23 * Can be overriden by arch-specific value.
24 */
25#ifndef IOREMAP_MAX_ORDER
26#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
27#endif
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029struct vm_struct {
Eric Dumazet2b4ac442006-11-10 12:27:48 -080030 struct vm_struct *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 void *addr;
32 unsigned long size;
33 unsigned long flags;
34 struct page **pages;
35 unsigned int nr_pages;
Kenji Kaneshigeffa71f32010-06-18 12:22:40 +090036 phys_addr_t phys_addr;
Marek Szyprowski5e6cafc2012-04-13 12:32:09 +020037 const void *caller;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038};
39
Atsushi Kumagai13ba3fc2013-04-29 15:07:40 -070040struct vmap_area {
41 unsigned long va_start;
42 unsigned long va_end;
43 unsigned long flags;
44 struct rb_node rb_node; /* address sorted rbtree */
45 struct list_head list; /* address sorted list */
46 struct list_head purge_list; /* "lazy purge" list */
47 struct vm_struct *vm;
48 struct rcu_head rcu_head;
49};
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051/*
52 * Highlevel APIs for driver use
53 */
Nick Piggindb64fe02008-10-18 20:27:03 -070054extern void vm_unmap_ram(const void *mem, unsigned int count);
55extern void *vm_map_ram(struct page **pages, unsigned int count,
56 int node, pgprot_t prot);
57extern void vm_unmap_aliases(void);
58
59#ifdef CONFIG_MMU
60extern void __init vmalloc_init(void);
61#else
62static inline void vmalloc_init(void)
63{
64}
65#endif
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067extern void *vmalloc(unsigned long size);
Dave Younge1ca7782010-10-26 14:22:06 -070068extern void *vzalloc(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070069extern void *vmalloc_user(unsigned long size);
Christoph Lameter930fc452005-10-29 18:15:41 -070070extern void *vmalloc_node(unsigned long size, int node);
Dave Younge1ca7782010-10-26 14:22:06 -070071extern void *vzalloc_node(unsigned long size, int node);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072extern void *vmalloc_exec(unsigned long size);
73extern void *vmalloc_32(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070074extern void *vmalloc_32_user(unsigned long size);
Al Virodd0fc662005-10-07 07:46:04 +010075extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
David Rientjesd0a21262011-01-13 15:46:02 -080076extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
77 unsigned long start, unsigned long end, gfp_t gfp_mask,
Marek Szyprowski5e6cafc2012-04-13 12:32:09 +020078 pgprot_t prot, int node, const void *caller);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080079extern void vfree(const void *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81extern void *vmap(struct page **pages, unsigned int count,
82 unsigned long flags, pgprot_t prot);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080083extern void vunmap(const void *addr);
Nick Piggin83342312006-06-23 02:03:20 -070084
HATAYAMA Daisukee69e9d4a2013-07-03 15:02:18 -070085extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
86 unsigned long uaddr, void *kaddr,
87 unsigned long size);
88
Nick Piggin83342312006-06-23 02:03:20 -070089extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
90 unsigned long pgoff);
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -070091void vmalloc_sync_all(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93/*
94 * Lowlevel-APIs (not for driver use!)
95 */
Jeremy Fitzhardinge95851162007-07-21 17:11:35 +020096
97static inline size_t get_vm_area_size(const struct vm_struct *area)
98{
99 /* return actual size without guard page */
100 return area->size - PAGE_SIZE;
101}
102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
Christoph Lameter23016962008-04-28 02:12:42 -0700104extern struct vm_struct *get_vm_area_caller(unsigned long size,
Marek Szyprowski5e6cafc2012-04-13 12:32:09 +0200105 unsigned long flags, const void *caller);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
107 unsigned long start, unsigned long end);
Benjamin Herrenschmidtc2968612009-02-18 14:48:12 -0800108extern struct vm_struct *__get_vm_area_caller(unsigned long size,
109 unsigned long flags,
110 unsigned long start, unsigned long end,
Marek Szyprowski5e6cafc2012-04-13 12:32:09 +0200111 const void *caller);
Christoph Lameterb3bdda02008-02-04 22:28:32 -0800112extern struct vm_struct *remove_vm_area(const void *addr);
Marek Szyprowskie9da6e92012-07-30 09:11:33 +0200113extern struct vm_struct *find_vm_area(const void *addr);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +1000114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
WANG Chaof6f8ed42014-08-06 16:06:58 -0700116 struct page **pages);
Graf Yangb554cb42011-03-28 12:53:29 +0100117#ifdef CONFIG_MMU
Tejun Heo8fc48982009-02-20 16:29:08 +0900118extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
119 pgprot_t prot, struct page **pages);
120extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +1000121extern void unmap_kernel_range(unsigned long addr, unsigned long size);
Graf Yangb554cb42011-03-28 12:53:29 +0100122#else
123static inline int
124map_kernel_range_noflush(unsigned long start, unsigned long size,
125 pgprot_t prot, struct page **pages)
126{
127 return size >> PAGE_SHIFT;
128}
129static inline void
130unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
131{
132}
133static inline void
134unmap_kernel_range(unsigned long addr, unsigned long size)
135{
136}
137#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Jeremy Fitzhardinge5f4352f2007-07-17 18:37:04 -0700139/* Allocate/destroy a 'vmalloc' VM area. */
David Vrabelcd129092011-09-29 16:53:32 +0100140extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
Jeremy Fitzhardinge5f4352f2007-07-17 18:37:04 -0700141extern void free_vm_area(struct vm_struct *area);
142
KOSAKI Motohiro69beeb1d2009-01-06 14:39:46 -0800143/* for /dev/kmem */
144extern long vread(char *buf, char *addr, unsigned long count);
145extern long vwrite(char *buf, char *addr, unsigned long count);
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147/*
148 * Internals. Dont't use..
149 */
Joonsoo Kimf1c40692013-04-29 15:07:37 -0700150extern struct list_head vmap_area_list;
Nicolas Pitrebe9b7332011-08-25 00:24:21 -0400151extern __init void vm_area_add_early(struct vm_struct *vm);
Tejun Heoc0c0a292009-02-24 11:57:21 +0900152extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Tejun Heo4f8b02b2010-09-03 18:22:47 +0200154#ifdef CONFIG_SMP
Graf Yangb554cb42011-03-28 12:53:29 +0100155# ifdef CONFIG_MMU
Tejun Heoca23e402009-08-14 15:00:52 +0900156struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
157 const size_t *sizes, int nr_vms,
David Rientjesec3f64f2011-01-13 15:46:01 -0800158 size_t align);
Tejun Heoca23e402009-08-14 15:00:52 +0900159
160void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
Graf Yangb554cb42011-03-28 12:53:29 +0100161# else
162static inline struct vm_struct **
163pcpu_get_vm_areas(const unsigned long *offsets,
164 const size_t *sizes, int nr_vms,
165 size_t align)
166{
167 return NULL;
168}
169
170static inline void
171pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
172{
173}
174# endif
Tejun Heo4f8b02b2010-09-03 18:22:47 +0200175#endif
Tejun Heoca23e402009-08-14 15:00:52 +0900176
Joonsoo Kimdb3808c2013-04-29 15:07:28 -0700177struct vmalloc_info {
178 unsigned long used;
179 unsigned long largest_chunk;
180};
181
182#ifdef CONFIG_MMU
183#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
184extern void get_vmalloc_info(struct vmalloc_info *vmi);
185#else
186
187#define VMALLOC_TOTAL 0UL
188#define get_vmalloc_info(vmi) \
189do { \
190 (vmi)->used = 0; \
191 (vmi)->largest_chunk = 0; \
192} while (0)
193#endif
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195#endif /* _LINUX_VMALLOC_H */