projects/linux·blob v4.14-rc3 · refs

207 lines · 6.2 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#ifndef CONFIG_MMU
84extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
85static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
86 gfp_t flags, void *caller)
87{
88 return __vmalloc_node_flags(size, node, flags);
89}
90#else
91extern void *__vmalloc_node_flags_caller(unsigned long size,
92 int node, gfp_t flags, void *caller);
93#endif
94
95extern void vfree(const void *addr);
96extern void vfree_atomic(const void *addr);
97
98extern void *vmap(struct page **pages, unsigned int count,
99 unsigned long flags, pgprot_t prot);
100extern void vunmap(const void *addr);
101
102extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
103 unsigned long uaddr, void *kaddr,
104 unsigned long size);
105
106extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
107 unsigned long pgoff);
108void vmalloc_sync_all(void);
109
110/*
111 * Lowlevel-APIs (not for driver use!)
112 */
113
114static inline size_t get_vm_area_size(const struct vm_struct *area)
115{
116 if (!(area->flags & VM_NO_GUARD))
117 /* return actual size without guard page */
118 return area->size - PAGE_SIZE;
119 else
120 return area->size;
121
122}
123
124extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
125extern struct vm_struct *get_vm_area_caller(unsigned long size,
126 unsigned long flags, const void *caller);
127extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
128 unsigned long start, unsigned long end);
129extern struct vm_struct *__get_vm_area_caller(unsigned long size,
130 unsigned long flags,
131 unsigned long start, unsigned long end,
132 const void *caller);
133extern struct vm_struct *remove_vm_area(const void *addr);
134extern struct vm_struct *find_vm_area(const void *addr);
135
136extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
137 struct page **pages);
138#ifdef CONFIG_MMU
139extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
140 pgprot_t prot, struct page **pages);
141extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
142extern void unmap_kernel_range(unsigned long addr, unsigned long size);
143#else
144static inline int
145map_kernel_range_noflush(unsigned long start, unsigned long size,
146 pgprot_t prot, struct page **pages)
147{
148 return size >> PAGE_SHIFT;
149}
150static inline void
151unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
152{
153}
154static inline void
155unmap_kernel_range(unsigned long addr, unsigned long size)
156{
157}
158#endif
159
160/* Allocate/destroy a 'vmalloc' VM area. */
161extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
162extern void free_vm_area(struct vm_struct *area);
163
164/* for /dev/kmem */
165extern long vread(char *buf, char *addr, unsigned long count);
166extern long vwrite(char *buf, char *addr, unsigned long count);
167
168/*
169 * Internals. Dont't use..
170 */
171extern struct list_head vmap_area_list;
172extern __init void vm_area_add_early(struct vm_struct *vm);
173extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
174
175#ifdef CONFIG_SMP
176# ifdef CONFIG_MMU
177struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
178 const size_t *sizes, int nr_vms,
179 size_t align);
180
181void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
182# else
183static inline struct vm_struct **
184pcpu_get_vm_areas(const unsigned long *offsets,
185 const size_t *sizes, int nr_vms,
186 size_t align)
187{
188 return NULL;
189}
190
191static inline void
192pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
193{
194}
195# endif
196#endif
197
198#ifdef CONFIG_MMU
199#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
200#else
201#define VMALLOC_TOTAL 0UL
202#endif
203
204int register_vmap_purge_notifier(struct notifier_block *nb);
205int unregister_vmap_purge_notifier(struct notifier_block *nb);
206
207#endif /* _LINUX_VMALLOC_H */