Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _LINUX_VMALLOC_H
2#define _LINUX_VMALLOC_H
3
4#include <linux/spinlock.h>
5#include <linux/init.h>
6#include <linux/list.h>
7#include <asm/page.h> /* pgprot_t */
8#include <linux/rbtree.h>
9
10struct vm_area_struct; /* vma defining user mapping in mm_types.h */
11
12/* bits in flags of vmalloc's vm_struct below */
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_UNLIST 0x00000020 /* vm_struct is not listed in vmlist */
19/* bits [20..32] reserved for arch specific ioremap internals */
20
21/*
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
29struct vm_struct {
30 struct vm_struct *next;
31 void *addr;
32 unsigned long size;
33 unsigned long flags;
34 struct page **pages;
35 unsigned int nr_pages;
36 phys_addr_t phys_addr;
37 const void *caller;
38};
39
40struct 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
51/*
52 * Highlevel APIs for driver use
53 */
54extern 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
67extern void *vmalloc(unsigned long size);
68extern void *vzalloc(unsigned long size);
69extern void *vmalloc_user(unsigned long size);
70extern void *vmalloc_node(unsigned long size, int node);
71extern void *vzalloc_node(unsigned long size, int node);
72extern void *vmalloc_exec(unsigned long size);
73extern void *vmalloc_32(unsigned long size);
74extern void *vmalloc_32_user(unsigned long size);
75extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
76extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
77 unsigned long start, unsigned long end, gfp_t gfp_mask,
78 pgprot_t prot, int node, const void *caller);
79extern void vfree(const void *addr);
80
81extern void *vmap(struct page **pages, unsigned int count,
82 unsigned long flags, pgprot_t prot);
83extern void vunmap(const void *addr);
84
85extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
86 unsigned long pgoff);
87void vmalloc_sync_all(void);
88
89/*
90 * Lowlevel-APIs (not for driver use!)
91 */
92
93static inline size_t get_vm_area_size(const struct vm_struct *area)
94{
95 /* return actual size without guard page */
96 return area->size - PAGE_SIZE;
97}
98
99extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
100extern struct vm_struct *get_vm_area_caller(unsigned long size,
101 unsigned long flags, const void *caller);
102extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
103 unsigned long start, unsigned long end);
104extern struct vm_struct *__get_vm_area_caller(unsigned long size,
105 unsigned long flags,
106 unsigned long start, unsigned long end,
107 const void *caller);
108extern struct vm_struct *remove_vm_area(const void *addr);
109extern struct vm_struct *find_vm_area(const void *addr);
110
111extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
112 struct page ***pages);
113#ifdef CONFIG_MMU
114extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
115 pgprot_t prot, struct page **pages);
116extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
117extern void unmap_kernel_range(unsigned long addr, unsigned long size);
118#else
119static inline int
120map_kernel_range_noflush(unsigned long start, unsigned long size,
121 pgprot_t prot, struct page **pages)
122{
123 return size >> PAGE_SHIFT;
124}
125static inline void
126unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
127{
128}
129static inline void
130unmap_kernel_range(unsigned long addr, unsigned long size)
131{
132}
133#endif
134
135/* Allocate/destroy a 'vmalloc' VM area. */
136extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
137extern void free_vm_area(struct vm_struct *area);
138
139/* for /dev/kmem */
140extern long vread(char *buf, char *addr, unsigned long count);
141extern long vwrite(char *buf, char *addr, unsigned long count);
142
143/*
144 * Internals. Dont't use..
145 */
146extern struct list_head vmap_area_list;
147extern __init void vm_area_add_early(struct vm_struct *vm);
148extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
149
150#ifdef CONFIG_SMP
151# ifdef CONFIG_MMU
152struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
153 const size_t *sizes, int nr_vms,
154 size_t align);
155
156void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
157# else
158static inline struct vm_struct **
159pcpu_get_vm_areas(const unsigned long *offsets,
160 const size_t *sizes, int nr_vms,
161 size_t align)
162{
163 return NULL;
164}
165
166static inline void
167pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
168{
169}
170# endif
171#endif
172
173struct vmalloc_info {
174 unsigned long used;
175 unsigned long largest_chunk;
176};
177
178#ifdef CONFIG_MMU
179#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
180extern void get_vmalloc_info(struct vmalloc_info *vmi);
181#else
182
183#define VMALLOC_TOTAL 0UL
184#define get_vmalloc_info(vmi) \
185do { \
186 (vmi)->used = 0; \
187 (vmi)->largest_chunk = 0; \
188} while (0)
189#endif
190
191#endif /* _LINUX_VMALLOC_H */