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 <linux/llist.h>
8#include <asm/page.h> /* pgprot_t */
9#include <linux/rbtree.h>
10
11struct vm_area_struct; /* vma defining user mapping in mm_types.h */
12struct notifier_block; /* in notifier.h */
13
14/* bits in flags of vmalloc's vm_struct below */
15#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
16#define VM_ALLOC 0x00000002 /* vmalloc() */
17#define VM_MAP 0x00000004 /* vmap()ed pages */
18#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
19#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
20#define VM_NO_GUARD 0x00000040 /* don't add guard page */
21#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
22/* bits [20..32] reserved for arch specific ioremap internals */
23
24/*
25 * Maximum alignment for ioremap() regions.
26 * Can be overriden by arch-specific value.
27 */
28#ifndef IOREMAP_MAX_ORDER
29#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
30#endif
31
32struct vm_struct {
33 struct vm_struct *next;
34 void *addr;
35 unsigned long size;
36 unsigned long flags;
37 struct page **pages;
38 unsigned int nr_pages;
39 phys_addr_t phys_addr;
40 const void *caller;
41};
42
43struct vmap_area {
44 unsigned long va_start;
45 unsigned long va_end;
46 unsigned long flags;
47 struct rb_node rb_node; /* address sorted rbtree */
48 struct list_head list; /* address sorted list */
49 struct llist_node purge_list; /* "lazy purge" list */
50 struct vm_struct *vm;
51 struct rcu_head rcu_head;
52};
53
54/*
55 * Highlevel APIs for driver use
56 */
57extern void vm_unmap_ram(const void *mem, unsigned int count);
58extern void *vm_map_ram(struct page **pages, unsigned int count,
59 int node, pgprot_t prot);
60extern void vm_unmap_aliases(void);
61
62#ifdef CONFIG_MMU
63extern void __init vmalloc_init(void);
64#else
65static inline void vmalloc_init(void)
66{
67}
68#endif
69
70extern void *vmalloc(unsigned long size);
71extern void *vzalloc(unsigned long size);
72extern void *vmalloc_user(unsigned long size);
73extern void *vmalloc_node(unsigned long size, int node);
74extern void *vzalloc_node(unsigned long size, int node);
75extern void *vmalloc_exec(unsigned long size);
76extern void *vmalloc_32(unsigned long size);
77extern void *vmalloc_32_user(unsigned long size);
78extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
79extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
80 unsigned long start, unsigned long end, gfp_t gfp_mask,
81 pgprot_t prot, unsigned long vm_flags, int node,
82 const void *caller);
83
84extern void vfree(const void *addr);
85extern void vfree_atomic(const void *addr);
86
87extern void *vmap(struct page **pages, unsigned int count,
88 unsigned long flags, pgprot_t prot);
89extern void vunmap(const void *addr);
90
91extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
92 unsigned long uaddr, void *kaddr,
93 unsigned long size);
94
95extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
96 unsigned long pgoff);
97void vmalloc_sync_all(void);
98
99/*
100 * Lowlevel-APIs (not for driver use!)
101 */
102
103static inline size_t get_vm_area_size(const struct vm_struct *area)
104{
105 if (!(area->flags & VM_NO_GUARD))
106 /* return actual size without guard page */
107 return area->size - PAGE_SIZE;
108 else
109 return area->size;
110
111}
112
113extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
114extern struct vm_struct *get_vm_area_caller(unsigned long size,
115 unsigned long flags, const void *caller);
116extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
117 unsigned long start, unsigned long end);
118extern struct vm_struct *__get_vm_area_caller(unsigned long size,
119 unsigned long flags,
120 unsigned long start, unsigned long end,
121 const void *caller);
122extern struct vm_struct *remove_vm_area(const void *addr);
123extern struct vm_struct *find_vm_area(const void *addr);
124
125extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
126 struct page **pages);
127#ifdef CONFIG_MMU
128extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
129 pgprot_t prot, struct page **pages);
130extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
131extern void unmap_kernel_range(unsigned long addr, unsigned long size);
132#else
133static inline int
134map_kernel_range_noflush(unsigned long start, unsigned long size,
135 pgprot_t prot, struct page **pages)
136{
137 return size >> PAGE_SHIFT;
138}
139static inline void
140unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
141{
142}
143static inline void
144unmap_kernel_range(unsigned long addr, unsigned long size)
145{
146}
147#endif
148
149/* Allocate/destroy a 'vmalloc' VM area. */
150extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
151extern void free_vm_area(struct vm_struct *area);
152
153/* for /dev/kmem */
154extern long vread(char *buf, char *addr, unsigned long count);
155extern long vwrite(char *buf, char *addr, unsigned long count);
156
157/*
158 * Internals. Dont't use..
159 */
160extern struct list_head vmap_area_list;
161extern __init void vm_area_add_early(struct vm_struct *vm);
162extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
163
164#ifdef CONFIG_SMP
165# ifdef CONFIG_MMU
166struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
167 const size_t *sizes, int nr_vms,
168 size_t align);
169
170void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
171# else
172static inline struct vm_struct **
173pcpu_get_vm_areas(const unsigned long *offsets,
174 const size_t *sizes, int nr_vms,
175 size_t align)
176{
177 return NULL;
178}
179
180static inline void
181pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
182{
183}
184# endif
185#endif
186
187#ifdef CONFIG_MMU
188#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
189#else
190#define VMALLOC_TOTAL 0UL
191#endif
192
193int register_vmap_purge_notifier(struct notifier_block *nb);
194int unregister_vmap_purge_notifier(struct notifier_block *nb);
195
196#endif /* _LINUX_VMALLOC_H */