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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_VMALLOC_H |
3 | #define _LINUX_VMALLOC_H | |
4 | ||
5 | #include <linux/spinlock.h> | |
db64fe02 | 6 | #include <linux/init.h> |
13ba3fcb | 7 | #include <linux/list.h> |
80c4bd7a | 8 | #include <linux/llist.h> |
1da177e4 | 9 | #include <asm/page.h> /* pgprot_t */ |
13ba3fcb | 10 | #include <linux/rbtree.h> |
3b3b1a29 | 11 | #include <linux/overflow.h> |
1da177e4 | 12 | |
605d9288 | 13 | struct vm_area_struct; /* vma defining user mapping in mm_types.h */ |
4da56b99 | 14 | struct notifier_block; /* in notifier.h */ |
83342314 | 15 | |
605d9288 | 16 | /* bits in flags of vmalloc's vm_struct below */ |
20fc02b4 ZY |
17 | #define VM_IOREMAP 0x00000001 /* ioremap() and friends */ |
18 | #define VM_ALLOC 0x00000002 /* vmalloc() */ | |
19 | #define VM_MAP 0x00000004 /* vmap()ed pages */ | |
20 | #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */ | |
fe9041c2 | 21 | #define VM_DMA_COHERENT 0x00000010 /* dma_alloc_coherent */ |
20fc02b4 | 22 | #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */ |
71394fe5 | 23 | #define VM_NO_GUARD 0x00000040 /* don't add guard page */ |
a5af5aa8 | 24 | #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */ |
868b104d RE |
25 | /* |
26 | * Memory with VM_FLUSH_RESET_PERMS cannot be freed in an interrupt or with | |
27 | * vfree_atomic(). | |
28 | */ | |
29 | #define VM_FLUSH_RESET_PERMS 0x00000100 /* Reset direct map and flush TLB on unmap */ | |
fe9041c2 | 30 | |
1da177e4 LT |
31 | /* bits [20..32] reserved for arch specific ioremap internals */ |
32 | ||
fd195c49 DS |
33 | /* |
34 | * Maximum alignment for ioremap() regions. | |
35 | * Can be overriden by arch-specific value. | |
36 | */ | |
37 | #ifndef IOREMAP_MAX_ORDER | |
38 | #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ | |
39 | #endif | |
40 | ||
1da177e4 | 41 | struct vm_struct { |
2b4ac44e | 42 | struct vm_struct *next; |
1da177e4 LT |
43 | void *addr; |
44 | unsigned long size; | |
45 | unsigned long flags; | |
46 | struct page **pages; | |
47 | unsigned int nr_pages; | |
ffa71f33 | 48 | phys_addr_t phys_addr; |
5e6cafc8 | 49 | const void *caller; |
1da177e4 LT |
50 | }; |
51 | ||
13ba3fcb AK |
52 | struct vmap_area { |
53 | unsigned long va_start; | |
54 | unsigned long va_end; | |
68ad4a33 | 55 | |
13ba3fcb AK |
56 | struct rb_node rb_node; /* address sorted rbtree */ |
57 | struct list_head list; /* address sorted list */ | |
688fcbfc PL |
58 | |
59 | /* | |
60 | * The following three variables can be packed, because | |
61 | * a vmap_area object is always one of the three states: | |
62 | * 1) in "free" tree (root is vmap_area_root) | |
63 | * 2) in "busy" tree (root is free_vmap_area_root) | |
64 | * 3) in purge list (head is vmap_purge_list) | |
65 | */ | |
66 | union { | |
67 | unsigned long subtree_max_size; /* in "free" tree */ | |
68 | struct vm_struct *vm; /* in "busy" tree */ | |
69 | struct llist_node purge_list; /* in purge list */ | |
70 | }; | |
13ba3fcb AK |
71 | }; |
72 | ||
1da177e4 LT |
73 | /* |
74 | * Highlevel APIs for driver use | |
75 | */ | |
db64fe02 NP |
76 | extern void vm_unmap_ram(const void *mem, unsigned int count); |
77 | extern void *vm_map_ram(struct page **pages, unsigned int count, | |
78 | int node, pgprot_t prot); | |
79 | extern void vm_unmap_aliases(void); | |
80 | ||
81 | #ifdef CONFIG_MMU | |
82 | extern void __init vmalloc_init(void); | |
97105f0a | 83 | extern unsigned long vmalloc_nr_pages(void); |
db64fe02 NP |
84 | #else |
85 | static inline void vmalloc_init(void) | |
86 | { | |
87 | } | |
97105f0a | 88 | static inline unsigned long vmalloc_nr_pages(void) { return 0; } |
db64fe02 NP |
89 | #endif |
90 | ||
1da177e4 | 91 | extern void *vmalloc(unsigned long size); |
e1ca7788 | 92 | extern void *vzalloc(unsigned long size); |
83342314 | 93 | extern void *vmalloc_user(unsigned long size); |
930fc45a | 94 | extern void *vmalloc_node(unsigned long size, int node); |
e1ca7788 | 95 | extern void *vzalloc_node(unsigned long size, int node); |
fc970227 | 96 | extern void *vmalloc_user_node_flags(unsigned long size, int node, gfp_t flags); |
1da177e4 LT |
97 | extern void *vmalloc_exec(unsigned long size); |
98 | extern void *vmalloc_32(unsigned long size); | |
83342314 | 99 | extern void *vmalloc_32_user(unsigned long size); |
dd0fc66f | 100 | extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); |
d0a21265 DR |
101 | extern void *__vmalloc_node_range(unsigned long size, unsigned long align, |
102 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
cb9e3c29 AR |
103 | pgprot_t prot, unsigned long vm_flags, int node, |
104 | const void *caller); | |
1f5307b1 | 105 | #ifndef CONFIG_MMU |
a7c3e901 | 106 | extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags); |
8594a21c MH |
107 | static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, |
108 | gfp_t flags, void *caller) | |
1f5307b1 | 109 | { |
8594a21c | 110 | return __vmalloc_node_flags(size, node, flags); |
1f5307b1 | 111 | } |
8594a21c MH |
112 | #else |
113 | extern void *__vmalloc_node_flags_caller(unsigned long size, | |
114 | int node, gfp_t flags, void *caller); | |
1f5307b1 | 115 | #endif |
cb9e3c29 | 116 | |
b3bdda02 | 117 | extern void vfree(const void *addr); |
bf22e37a | 118 | extern void vfree_atomic(const void *addr); |
1da177e4 LT |
119 | |
120 | extern void *vmap(struct page **pages, unsigned int count, | |
121 | unsigned long flags, pgprot_t prot); | |
b3bdda02 | 122 | extern void vunmap(const void *addr); |
83342314 | 123 | |
e69e9d4a HD |
124 | extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, |
125 | unsigned long uaddr, void *kaddr, | |
126 | unsigned long size); | |
127 | ||
83342314 NP |
128 | extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, |
129 | unsigned long pgoff); | |
1eeb66a1 | 130 | void vmalloc_sync_all(void); |
1da177e4 LT |
131 | |
132 | /* | |
133 | * Lowlevel-APIs (not for driver use!) | |
134 | */ | |
9585116b JF |
135 | |
136 | static inline size_t get_vm_area_size(const struct vm_struct *area) | |
137 | { | |
71394fe5 AR |
138 | if (!(area->flags & VM_NO_GUARD)) |
139 | /* return actual size without guard page */ | |
140 | return area->size - PAGE_SIZE; | |
141 | else | |
142 | return area->size; | |
143 | ||
9585116b JF |
144 | } |
145 | ||
1da177e4 | 146 | extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); |
23016969 | 147 | extern struct vm_struct *get_vm_area_caller(unsigned long size, |
5e6cafc8 | 148 | unsigned long flags, const void *caller); |
1da177e4 LT |
149 | extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, |
150 | unsigned long start, unsigned long end); | |
c2968612 BH |
151 | extern struct vm_struct *__get_vm_area_caller(unsigned long size, |
152 | unsigned long flags, | |
153 | unsigned long start, unsigned long end, | |
5e6cafc8 | 154 | const void *caller); |
b3bdda02 | 155 | extern struct vm_struct *remove_vm_area(const void *addr); |
e9da6e99 | 156 | extern struct vm_struct *find_vm_area(const void *addr); |
c19c03fc | 157 | |
1da177e4 | 158 | extern int map_vm_area(struct vm_struct *area, pgprot_t prot, |
f6f8ed47 | 159 | struct page **pages); |
b554cb42 | 160 | #ifdef CONFIG_MMU |
8fc48985 TH |
161 | extern int map_kernel_range_noflush(unsigned long start, unsigned long size, |
162 | pgprot_t prot, struct page **pages); | |
163 | extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); | |
c19c03fc | 164 | extern void unmap_kernel_range(unsigned long addr, unsigned long size); |
868b104d RE |
165 | static inline void set_vm_flush_reset_perms(void *addr) |
166 | { | |
167 | struct vm_struct *vm = find_vm_area(addr); | |
168 | ||
169 | if (vm) | |
170 | vm->flags |= VM_FLUSH_RESET_PERMS; | |
171 | } | |
b554cb42 GY |
172 | #else |
173 | static inline int | |
174 | map_kernel_range_noflush(unsigned long start, unsigned long size, | |
175 | pgprot_t prot, struct page **pages) | |
176 | { | |
177 | return size >> PAGE_SHIFT; | |
178 | } | |
179 | static inline void | |
180 | unmap_kernel_range_noflush(unsigned long addr, unsigned long size) | |
181 | { | |
182 | } | |
183 | static inline void | |
184 | unmap_kernel_range(unsigned long addr, unsigned long size) | |
185 | { | |
186 | } | |
868b104d RE |
187 | static inline void set_vm_flush_reset_perms(void *addr) |
188 | { | |
189 | } | |
b554cb42 | 190 | #endif |
1da177e4 | 191 | |
5f4352fb | 192 | /* Allocate/destroy a 'vmalloc' VM area. */ |
cd12909c | 193 | extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); |
5f4352fb JF |
194 | extern void free_vm_area(struct vm_struct *area); |
195 | ||
69beeb1d KM |
196 | /* for /dev/kmem */ |
197 | extern long vread(char *buf, char *addr, unsigned long count); | |
198 | extern long vwrite(char *buf, char *addr, unsigned long count); | |
199 | ||
1da177e4 LT |
200 | /* |
201 | * Internals. Dont't use.. | |
202 | */ | |
f1c4069e | 203 | extern struct list_head vmap_area_list; |
be9b7335 | 204 | extern __init void vm_area_add_early(struct vm_struct *vm); |
c0c0a293 | 205 | extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); |
1da177e4 | 206 | |
4f8b02b4 | 207 | #ifdef CONFIG_SMP |
b554cb42 | 208 | # ifdef CONFIG_MMU |
ca23e405 TH |
209 | struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, |
210 | const size_t *sizes, int nr_vms, | |
ec3f64fc | 211 | size_t align); |
ca23e405 TH |
212 | |
213 | void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); | |
b554cb42 GY |
214 | # else |
215 | static inline struct vm_struct ** | |
216 | pcpu_get_vm_areas(const unsigned long *offsets, | |
217 | const size_t *sizes, int nr_vms, | |
218 | size_t align) | |
219 | { | |
220 | return NULL; | |
221 | } | |
222 | ||
223 | static inline void | |
224 | pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) | |
225 | { | |
226 | } | |
227 | # endif | |
4f8b02b4 | 228 | #endif |
ca23e405 | 229 | |
db3808c1 JK |
230 | #ifdef CONFIG_MMU |
231 | #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) | |
db3808c1 | 232 | #else |
db3808c1 | 233 | #define VMALLOC_TOTAL 0UL |
db3808c1 JK |
234 | #endif |
235 | ||
4da56b99 CW |
236 | int register_vmap_purge_notifier(struct notifier_block *nb); |
237 | int unregister_vmap_purge_notifier(struct notifier_block *nb); | |
238 | ||
1da177e4 | 239 | #endif /* _LINUX_VMALLOC_H */ |