Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
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> /* pgprot_t */
10#include <linux/rbtree.h>
11
12struct vm_area_struct; /* vma defining user mapping in mm_types.h */
13struct notifier_block; /* in notifier.h */
14
15/* bits in flags of vmalloc's vm_struct below */
16#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
17#define VM_ALLOC 0x00000002 /* vmalloc() */
18#define VM_MAP 0x00000004 /* vmap()ed pages */
19#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
20#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
21#define VM_NO_GUARD 0x00000040 /* don't add guard page */
22#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
23/* bits [20..32] reserved for arch specific ioremap internals */
24
25/*
26 * Maximum alignment for ioremap() regions.
27 * Can be overriden by arch-specific value.
28 */
29#ifndef IOREMAP_MAX_ORDER
30#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
31#endif
32
33struct vm_struct {
34 struct vm_struct *next;
35 void *addr;
36 unsigned long size;
37 unsigned long flags;
38 struct page **pages;
39 unsigned int nr_pages;
40 phys_addr_t phys_addr;
41 const void *caller;
42};
43
44struct vmap_area {
45 unsigned long va_start;
46 unsigned long va_end;
47 unsigned long flags;
48 struct rb_node rb_node; /* address sorted rbtree */
49 struct list_head list; /* address sorted list */
50 struct llist_node purge_list; /* "lazy purge" list */
51 struct vm_struct *vm;
52 struct rcu_head rcu_head;
53};
54
55/*
56 * Highlevel APIs for driver use
57 */
58extern void vm_unmap_ram(const void *mem, unsigned int count);
59extern void *vm_map_ram(struct page **pages, unsigned int count,
60 int node, pgprot_t prot);
61extern void vm_unmap_aliases(void);
62
63#ifdef CONFIG_MMU
64extern void __init vmalloc_init(void);
65#else
66static inline void vmalloc_init(void)
67{
68}
69#endif
70
71extern void *vmalloc(unsigned long size);
72extern void *vzalloc(unsigned long size);
73extern void *vmalloc_user(unsigned long size);
74extern void *vmalloc_node(unsigned long size, int node);
75extern void *vzalloc_node(unsigned long size, int node);
76extern void *vmalloc_exec(unsigned long size);
77extern void *vmalloc_32(unsigned long size);
78extern void *vmalloc_32_user(unsigned long size);
79extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
80extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
81 unsigned long start, unsigned long end, gfp_t gfp_mask,
82 pgprot_t prot, unsigned long vm_flags, int node,
83 const void *caller);
84#ifndef CONFIG_MMU
85extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
86static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
87 gfp_t flags, void *caller)
88{
89 return __vmalloc_node_flags(size, node, flags);
90}
91#else
92extern void *__vmalloc_node_flags_caller(unsigned long size,
93 int node, gfp_t flags, void *caller);
94#endif
95
96extern void vfree(const void *addr);
97extern void vfree_atomic(const void *addr);
98
99extern void *vmap(struct page **pages, unsigned int count,
100 unsigned long flags, pgprot_t prot);
101extern void vunmap(const void *addr);
102
103extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
104 unsigned long uaddr, void *kaddr,
105 unsigned long size);
106
107extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
108 unsigned long pgoff);
109void vmalloc_sync_all(void);
110
111/*
112 * Lowlevel-APIs (not for driver use!)
113 */
114
115static inline size_t get_vm_area_size(const struct vm_struct *area)
116{
117 if (!(area->flags & VM_NO_GUARD))
118 /* return actual size without guard page */
119 return area->size - PAGE_SIZE;
120 else
121 return area->size;
122
123}
124
125extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
126extern struct vm_struct *get_vm_area_caller(unsigned long size,
127 unsigned long flags, const void *caller);
128extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
129 unsigned long start, unsigned long end);
130extern struct vm_struct *__get_vm_area_caller(unsigned long size,
131 unsigned long flags,
132 unsigned long start, unsigned long end,
133 const void *caller);
134extern struct vm_struct *remove_vm_area(const void *addr);
135extern struct vm_struct *find_vm_area(const void *addr);
136
137extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
138 struct page **pages);
139#ifdef CONFIG_MMU
140extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
141 pgprot_t prot, struct page **pages);
142extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
143extern void unmap_kernel_range(unsigned long addr, unsigned long size);
144#else
145static inline int
146map_kernel_range_noflush(unsigned long start, unsigned long size,
147 pgprot_t prot, struct page **pages)
148{
149 return size >> PAGE_SHIFT;
150}
151static inline void
152unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
153{
154}
155static inline void
156unmap_kernel_range(unsigned long addr, unsigned long size)
157{
158}
159#endif
160
161/* Allocate/destroy a 'vmalloc' VM area. */
162extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
163extern void free_vm_area(struct vm_struct *area);
164
165/* for /dev/kmem */
166extern long vread(char *buf, char *addr, unsigned long count);
167extern long vwrite(char *buf, char *addr, unsigned long count);
168
169/*
170 * Internals. Dont't use..
171 */
172extern struct list_head vmap_area_list;
173extern __init void vm_area_add_early(struct vm_struct *vm);
174extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
175
176#ifdef CONFIG_SMP
177# ifdef CONFIG_MMU
178struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
179 const size_t *sizes, int nr_vms,
180 size_t align);
181
182void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
183# else
184static inline struct vm_struct **
185pcpu_get_vm_areas(const unsigned long *offsets,
186 const size_t *sizes, int nr_vms,
187 size_t align)
188{
189 return NULL;
190}
191
192static inline void
193pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
194{
195}
196# endif
197#endif
198
199#ifdef CONFIG_MMU
200#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
201#else
202#define VMALLOC_TOTAL 0UL
203#endif
204
205int register_vmap_purge_notifier(struct notifier_block *nb);
206int unregister_vmap_purge_notifier(struct notifier_block *nb);
207
208#endif /* _LINUX_VMALLOC_H */