1
2#ifndef _LINUX_VMALLOC_H
3#define _LINUX_VMALLOC_H
4
5#include <linux/spinlock.h>
6#include <linux/init.h>
7#include <linux/list.h>
8#include <linux/llist.h>
9#include <asm/page.h>
10#include <linux/rbtree.h>
11#include <linux/overflow.h>
12
13struct vm_area_struct;
14struct notifier_block;
15
16
17#define VM_IOREMAP 0x00000001
18#define VM_ALLOC 0x00000002
19#define VM_MAP 0x00000004
20#define VM_USERMAP 0x00000008
21#define VM_DMA_COHERENT 0x00000010
22#define VM_UNINITIALIZED 0x00000020
23#define VM_NO_GUARD 0x00000040
24#define VM_KASAN 0x00000080
25
26
27
28
29#define VM_FLUSH_RESET_PERMS 0x00000100
30
31
32
33
34
35
36
37#ifndef IOREMAP_MAX_ORDER
38#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT)
39#endif
40
41struct vm_struct {
42 struct vm_struct *next;
43 void *addr;
44 unsigned long size;
45 unsigned long flags;
46 struct page **pages;
47 unsigned int nr_pages;
48 phys_addr_t phys_addr;
49 const void *caller;
50};
51
52struct vmap_area {
53 unsigned long va_start;
54 unsigned long va_end;
55 unsigned long flags;
56 struct rb_node rb_node;
57 struct list_head list;
58 struct llist_node purge_list;
59 struct vm_struct *vm;
60 struct rcu_head rcu_head;
61};
62
63
64
65
66extern void vm_unmap_ram(const void *mem, unsigned int count);
67extern void *vm_map_ram(struct page **pages, unsigned int count,
68 int node, pgprot_t prot);
69extern void vm_unmap_aliases(void);
70
71#ifdef CONFIG_MMU
72extern void __init vmalloc_init(void);
73#else
74static inline void vmalloc_init(void)
75{
76}
77#endif
78
79extern void *vmalloc(unsigned long size);
80extern void *vzalloc(unsigned long size);
81extern void *vmalloc_user(unsigned long size);
82extern void *vmalloc_node(unsigned long size, int node);
83extern void *vzalloc_node(unsigned long size, int node);
84extern void *vmalloc_user_node_flags(unsigned long size, int node, gfp_t flags);
85extern void *vmalloc_exec(unsigned long size);
86extern void *vmalloc_32(unsigned long size);
87extern void *vmalloc_32_user(unsigned long size);
88extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
89extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
90 unsigned long start, unsigned long end, gfp_t gfp_mask,
91 pgprot_t prot, unsigned long vm_flags, int node,
92 const void *caller);
93#ifndef CONFIG_MMU
94extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
95static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
96 gfp_t flags, void *caller)
97{
98 return __vmalloc_node_flags(size, node, flags);
99}
100#else
101extern void *__vmalloc_node_flags_caller(unsigned long size,
102 int node, gfp_t flags, void *caller);
103#endif
104
105extern void vfree(const void *addr);
106extern void vfree_atomic(const void *addr);
107
108extern void *vmap(struct page **pages, unsigned int count,
109 unsigned long flags, pgprot_t prot);
110extern void vunmap(const void *addr);
111
112extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
113 unsigned long uaddr, void *kaddr,
114 unsigned long pgoff, unsigned long size);
115
116extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
117 unsigned long pgoff);
118void vmalloc_sync_mappings(void);
119void vmalloc_sync_unmappings(void);
120
121
122
123
124
125static inline size_t get_vm_area_size(const struct vm_struct *area)
126{
127 if (!(area->flags & VM_NO_GUARD))
128
129 return area->size - PAGE_SIZE;
130 else
131 return area->size;
132
133}
134
135extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
136extern struct vm_struct *get_vm_area_caller(unsigned long size,
137 unsigned long flags, const void *caller);
138extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
139 unsigned long start, unsigned long end);
140extern struct vm_struct *__get_vm_area_caller(unsigned long size,
141 unsigned long flags,
142 unsigned long start, unsigned long end,
143 const void *caller);
144extern struct vm_struct *remove_vm_area(const void *addr);
145extern struct vm_struct *find_vm_area(const void *addr);
146
147extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
148 struct page **pages);
149#ifdef CONFIG_MMU
150extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
151 pgprot_t prot, struct page **pages);
152extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
153extern void unmap_kernel_range(unsigned long addr, unsigned long size);
154static inline void set_vm_flush_reset_perms(void *addr)
155{
156 struct vm_struct *vm = find_vm_area(addr);
157
158 if (vm)
159 vm->flags |= VM_FLUSH_RESET_PERMS;
160}
161#else
162static inline int
163map_kernel_range_noflush(unsigned long start, unsigned long size,
164 pgprot_t prot, struct page **pages)
165{
166 return size >> PAGE_SHIFT;
167}
168static inline void
169unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
170{
171}
172static inline void
173unmap_kernel_range(unsigned long addr, unsigned long size)
174{
175}
176static inline void set_vm_flush_reset_perms(void *addr)
177{
178}
179#endif
180
181
182extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
183extern void free_vm_area(struct vm_struct *area);
184
185
186extern long vread(char *buf, char *addr, unsigned long count);
187extern long vwrite(char *buf, char *addr, unsigned long count);
188
189
190
191
192extern struct list_head vmap_area_list;
193extern __init void vm_area_add_early(struct vm_struct *vm);
194extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
195
196#ifdef CONFIG_SMP
197# ifdef CONFIG_MMU
198struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
199 const size_t *sizes, int nr_vms,
200 size_t align);
201
202void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
203# else
204static inline struct vm_struct **
205pcpu_get_vm_areas(const unsigned long *offsets,
206 const size_t *sizes, int nr_vms,
207 size_t align)
208{
209 return NULL;
210}
211
212static inline void
213pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
214{
215}
216# endif
217#endif
218
219#ifdef CONFIG_MMU
220#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
221#else
222#define VMALLOC_TOTAL 0UL
223#endif
224
225int register_vmap_purge_notifier(struct notifier_block *nb);
226int unregister_vmap_purge_notifier(struct notifier_block *nb);
227
228#endif
229