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 <asm/page.h> /* pgprot_t */
8 #include <linux/rbtree.h>
9
10 struct vm_area_struct; /* vma defining user mapping in mm_types.h */
11
12 /* bits in flags of vmalloc's vm_struct below */
13 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */
14 #define VM_ALLOC 0x00000002 /* vmalloc() */
15 #define VM_MAP 0x00000004 /* vmap()ed pages */
16 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
17 #define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
18 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
19 /* bits [20..32] reserved for arch specific ioremap internals */
20
21 /*
22 * Maximum alignment for ioremap() regions.
23 * Can be overriden by arch-specific value.
24 */
25 #ifndef IOREMAP_MAX_ORDER
26 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
27 #endif
28
29 struct vm_struct {
30 struct vm_struct *next;
31 void *addr;
32 unsigned long size;
33 unsigned long flags;
34 struct page **pages;
35 unsigned int nr_pages;
36 phys_addr_t phys_addr;
37 const void *caller;
38 };
39
40 struct vmap_area {
41 unsigned long va_start;
42 unsigned long va_end;
43 unsigned long flags;
44 struct rb_node rb_node; /* address sorted rbtree */
45 struct list_head list; /* address sorted list */
46 struct list_head purge_list; /* "lazy purge" list */
47 struct vm_struct *vm;
48 struct rcu_head rcu_head;
49 };
50
51 /*
52 * Highlevel APIs for driver use
53 */
54 extern void vm_unmap_ram(const void *mem, unsigned int count);
55 extern void *vm_map_ram(struct page **pages, unsigned int count,
56 int node, pgprot_t prot);
57 extern void vm_unmap_aliases(void);
58
59 #ifdef CONFIG_MMU
60 extern void __init vmalloc_init(void);
61 #else
vmalloc_init(void)62 static inline void vmalloc_init(void)
63 {
64 }
65 #endif
66
67 extern void *vmalloc(unsigned long size);
68 extern void *vzalloc(unsigned long size);
69 extern void *vmalloc_user(unsigned long size);
70 extern void *vmalloc_node(unsigned long size, int node);
71 extern void *vzalloc_node(unsigned long size, int node);
72 extern void *vmalloc_exec(unsigned long size);
73 extern void *vmalloc_32(unsigned long size);
74 extern void *vmalloc_32_user(unsigned long size);
75 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
76 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
77 unsigned long start, unsigned long end, gfp_t gfp_mask,
78 pgprot_t prot, int node, const void *caller);
79 extern void vfree(const void *addr);
80
81 extern void *vmap(struct page **pages, unsigned int count,
82 unsigned long flags, pgprot_t prot);
83 extern void vunmap(const void *addr);
84
85 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
86 unsigned long uaddr, void *kaddr,
87 unsigned long size);
88
89 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
90 unsigned long pgoff);
91 void vmalloc_sync_all(void);
92
93 /*
94 * Lowlevel-APIs (not for driver use!)
95 */
96
get_vm_area_size(const struct vm_struct * area)97 static inline size_t get_vm_area_size(const struct vm_struct *area)
98 {
99 /* return actual size without guard page */
100 return area->size - PAGE_SIZE;
101 }
102
103 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
104 extern struct vm_struct *get_vm_area_caller(unsigned long size,
105 unsigned long flags, const void *caller);
106 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
107 unsigned long start, unsigned long end);
108 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
109 unsigned long flags,
110 unsigned long start, unsigned long end,
111 const void *caller);
112 extern struct vm_struct *remove_vm_area(const void *addr);
113 extern struct vm_struct *find_vm_area(const void *addr);
114
115 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
116 struct page **pages);
117 #ifdef CONFIG_MMU
118 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
119 pgprot_t prot, struct page **pages);
120 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
121 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
122 #else
123 static inline int
map_kernel_range_noflush(unsigned long start,unsigned long size,pgprot_t prot,struct page ** pages)124 map_kernel_range_noflush(unsigned long start, unsigned long size,
125 pgprot_t prot, struct page **pages)
126 {
127 return size >> PAGE_SHIFT;
128 }
129 static inline void
unmap_kernel_range_noflush(unsigned long addr,unsigned long size)130 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
131 {
132 }
133 static inline void
unmap_kernel_range(unsigned long addr,unsigned long size)134 unmap_kernel_range(unsigned long addr, unsigned long size)
135 {
136 }
137 #endif
138
139 /* Allocate/destroy a 'vmalloc' VM area. */
140 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
141 extern void free_vm_area(struct vm_struct *area);
142
143 /* for /dev/kmem */
144 extern long vread(char *buf, char *addr, unsigned long count);
145 extern long vwrite(char *buf, char *addr, unsigned long count);
146
147 /*
148 * Internals. Dont't use..
149 */
150 extern struct list_head vmap_area_list;
151 extern __init void vm_area_add_early(struct vm_struct *vm);
152 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
153
154 #ifdef CONFIG_SMP
155 # ifdef CONFIG_MMU
156 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
157 const size_t *sizes, int nr_vms,
158 size_t align);
159
160 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
161 # else
162 static inline struct vm_struct **
pcpu_get_vm_areas(const unsigned long * offsets,const size_t * sizes,int nr_vms,size_t align)163 pcpu_get_vm_areas(const unsigned long *offsets,
164 const size_t *sizes, int nr_vms,
165 size_t align)
166 {
167 return NULL;
168 }
169
170 static inline void
pcpu_free_vm_areas(struct vm_struct ** vms,int nr_vms)171 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
172 {
173 }
174 # endif
175 #endif
176
177 struct vmalloc_info {
178 unsigned long used;
179 unsigned long largest_chunk;
180 };
181
182 #ifdef CONFIG_MMU
183 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
184 extern void get_vmalloc_info(struct vmalloc_info *vmi);
185 #else
186
187 #define VMALLOC_TOTAL 0UL
188 #define get_vmalloc_info(vmi) \
189 do { \
190 (vmi)->used = 0; \
191 (vmi)->largest_chunk = 0; \
192 } while (0)
193 #endif
194
195 #endif /* _LINUX_VMALLOC_H */
196