projects/linux·blob v4.8-rc2 · refs

195 lines · 5.8 KiB

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);
85
86extern void *vmap(struct page **pages, unsigned int count,
87 unsigned long flags, pgprot_t prot);
88extern void vunmap(const void *addr);
89
90extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
91 unsigned long uaddr, void *kaddr,
92 unsigned long size);
93
94extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
95 unsigned long pgoff);
96void vmalloc_sync_all(void);
97
98/*
99 * Lowlevel-APIs (not for driver use!)
100 */
101
102static inline size_t get_vm_area_size(const struct vm_struct *area)
103{
104 if (!(area->flags & VM_NO_GUARD))
105 /* return actual size without guard page */
106 return area->size - PAGE_SIZE;
107 else
108 return area->size;
109
110}
111
112extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
113extern struct vm_struct *get_vm_area_caller(unsigned long size,
114 unsigned long flags, const void *caller);
115extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
116 unsigned long start, unsigned long end);
117extern struct vm_struct *__get_vm_area_caller(unsigned long size,
118 unsigned long flags,
119 unsigned long start, unsigned long end,
120 const void *caller);
121extern struct vm_struct *remove_vm_area(const void *addr);
122extern struct vm_struct *find_vm_area(const void *addr);
123
124extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
125 struct page **pages);
126#ifdef CONFIG_MMU
127extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
128 pgprot_t prot, struct page **pages);
129extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
130extern void unmap_kernel_range(unsigned long addr, unsigned long size);
131#else
132static inline int
133map_kernel_range_noflush(unsigned long start, unsigned long size,
134 pgprot_t prot, struct page **pages)
135{
136 return size >> PAGE_SHIFT;
137}
138static inline void
139unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
140{
141}
142static inline void
143unmap_kernel_range(unsigned long addr, unsigned long size)
144{
145}
146#endif
147
148/* Allocate/destroy a 'vmalloc' VM area. */
149extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
150extern void free_vm_area(struct vm_struct *area);
151
152/* for /dev/kmem */
153extern long vread(char *buf, char *addr, unsigned long count);
154extern long vwrite(char *buf, char *addr, unsigned long count);
155
156/*
157 * Internals. Dont't use..
158 */
159extern struct list_head vmap_area_list;
160extern __init void vm_area_add_early(struct vm_struct *vm);
161extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
162
163#ifdef CONFIG_SMP
164# ifdef CONFIG_MMU
165struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
166 const size_t *sizes, int nr_vms,
167 size_t align);
168
169void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
170# else
171static inline struct vm_struct **
172pcpu_get_vm_areas(const unsigned long *offsets,
173 const size_t *sizes, int nr_vms,
174 size_t align)
175{
176 return NULL;
177}
178
179static inline void
180pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
181{
182}
183# endif
184#endif
185
186#ifdef CONFIG_MMU
187#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
188#else
189#define VMALLOC_TOTAL 0UL
190#endif
191
192int register_vmap_purge_notifier(struct notifier_block *nb);
193int unregister_vmap_purge_notifier(struct notifier_block *nb);
194
195#endif /* _LINUX_VMALLOC_H */