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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 | |
1f059dfd IM |
13 | #include <asm/vmalloc.h> |
14 | ||
605d9288 | 15 | struct vm_area_struct; /* vma defining user mapping in mm_types.h */ |
4da56b99 | 16 | struct notifier_block; /* in notifier.h */ |
83342314 | 17 | |
605d9288 | 18 | /* bits in flags of vmalloc's vm_struct below */ |
20fc02b4 ZY |
19 | #define VM_IOREMAP 0x00000001 /* ioremap() and friends */ |
20 | #define VM_ALLOC 0x00000002 /* vmalloc() */ | |
21 | #define VM_MAP 0x00000004 /* vmap()ed pages */ | |
22 | #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */ | |
fe9041c2 | 23 | #define VM_DMA_COHERENT 0x00000010 /* dma_alloc_coherent */ |
20fc02b4 | 24 | #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */ |
71394fe5 | 25 | #define VM_NO_GUARD 0x00000040 /* don't add guard page */ |
a5af5aa8 | 26 | #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */ |
3c5c3cfb DA |
27 | |
28 | /* | |
29 | * VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLOC. | |
30 | * | |
31 | * If IS_ENABLED(CONFIG_KASAN_VMALLOC), VM_KASAN is set on a vm_struct after | |
32 | * shadow memory has been mapped. It's used to handle allocation errors so that | |
33 | * we don't try to poision shadow on free if it was never allocated. | |
34 | * | |
35 | * Otherwise, VM_KASAN is set for kasan_module_alloc() allocations and used to | |
36 | * determine which allocations need the module shadow freed. | |
37 | */ | |
38 | ||
868b104d RE |
39 | /* |
40 | * Memory with VM_FLUSH_RESET_PERMS cannot be freed in an interrupt or with | |
41 | * vfree_atomic(). | |
42 | */ | |
43 | #define VM_FLUSH_RESET_PERMS 0x00000100 /* Reset direct map and flush TLB on unmap */ | |
fe9041c2 | 44 | |
1da177e4 LT |
45 | /* bits [20..32] reserved for arch specific ioremap internals */ |
46 | ||
fd195c49 DS |
47 | /* |
48 | * Maximum alignment for ioremap() regions. | |
49 | * Can be overriden by arch-specific value. | |
50 | */ | |
51 | #ifndef IOREMAP_MAX_ORDER | |
52 | #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ | |
53 | #endif | |
54 | ||
1da177e4 | 55 | struct vm_struct { |
2b4ac44e | 56 | struct vm_struct *next; |
1da177e4 LT |
57 | void *addr; |
58 | unsigned long size; | |
59 | unsigned long flags; | |
60 | struct page **pages; | |
61 | unsigned int nr_pages; | |
ffa71f33 | 62 | phys_addr_t phys_addr; |
5e6cafc8 | 63 | const void *caller; |
1da177e4 LT |
64 | }; |
65 | ||
13ba3fcb AK |
66 | struct vmap_area { |
67 | unsigned long va_start; | |
68 | unsigned long va_end; | |
68ad4a33 | 69 | |
13ba3fcb AK |
70 | struct rb_node rb_node; /* address sorted rbtree */ |
71 | struct list_head list; /* address sorted list */ | |
688fcbfc PL |
72 | |
73 | /* | |
74 | * The following three variables can be packed, because | |
75 | * a vmap_area object is always one of the three states: | |
76 | * 1) in "free" tree (root is vmap_area_root) | |
77 | * 2) in "busy" tree (root is free_vmap_area_root) | |
78 | * 3) in purge list (head is vmap_purge_list) | |
79 | */ | |
80 | union { | |
81 | unsigned long subtree_max_size; /* in "free" tree */ | |
82 | struct vm_struct *vm; /* in "busy" tree */ | |
83 | struct llist_node purge_list; /* in purge list */ | |
84 | }; | |
13ba3fcb AK |
85 | }; |
86 | ||
1da177e4 LT |
87 | /* |
88 | * Highlevel APIs for driver use | |
89 | */ | |
db64fe02 | 90 | extern void vm_unmap_ram(const void *mem, unsigned int count); |
d4efd79a | 91 | extern void *vm_map_ram(struct page **pages, unsigned int count, int node); |
db64fe02 NP |
92 | extern void vm_unmap_aliases(void); |
93 | ||
94 | #ifdef CONFIG_MMU | |
95 | extern void __init vmalloc_init(void); | |
97105f0a | 96 | extern unsigned long vmalloc_nr_pages(void); |
db64fe02 NP |
97 | #else |
98 | static inline void vmalloc_init(void) | |
99 | { | |
100 | } | |
97105f0a | 101 | static inline unsigned long vmalloc_nr_pages(void) { return 0; } |
db64fe02 NP |
102 | #endif |
103 | ||
1da177e4 | 104 | extern void *vmalloc(unsigned long size); |
e1ca7788 | 105 | extern void *vzalloc(unsigned long size); |
83342314 | 106 | extern void *vmalloc_user(unsigned long size); |
930fc45a | 107 | extern void *vmalloc_node(unsigned long size, int node); |
e1ca7788 | 108 | extern void *vzalloc_node(unsigned long size, int node); |
fc970227 | 109 | extern void *vmalloc_user_node_flags(unsigned long size, int node, gfp_t flags); |
1da177e4 LT |
110 | extern void *vmalloc_exec(unsigned long size); |
111 | extern void *vmalloc_32(unsigned long size); | |
83342314 | 112 | extern void *vmalloc_32_user(unsigned long size); |
88dca4ca | 113 | extern void *__vmalloc(unsigned long size, gfp_t gfp_mask); |
d0a21265 DR |
114 | extern void *__vmalloc_node_range(unsigned long size, unsigned long align, |
115 | unsigned long start, unsigned long end, gfp_t gfp_mask, | |
cb9e3c29 AR |
116 | pgprot_t prot, unsigned long vm_flags, int node, |
117 | const void *caller); | |
8594a21c MH |
118 | extern void *__vmalloc_node_flags_caller(unsigned long size, |
119 | int node, gfp_t flags, void *caller); | |
cb9e3c29 | 120 | |
b3bdda02 | 121 | extern void vfree(const void *addr); |
bf22e37a | 122 | extern void vfree_atomic(const void *addr); |
1da177e4 LT |
123 | |
124 | extern void *vmap(struct page **pages, unsigned int count, | |
125 | unsigned long flags, pgprot_t prot); | |
b3bdda02 | 126 | extern void vunmap(const void *addr); |
83342314 | 127 | |
e69e9d4a HD |
128 | extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, |
129 | unsigned long uaddr, void *kaddr, | |
bdebd6a2 | 130 | unsigned long pgoff, unsigned long size); |
e69e9d4a | 131 | |
83342314 NP |
132 | extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, |
133 | unsigned long pgoff); | |
763802b5 JR |
134 | void vmalloc_sync_mappings(void); |
135 | void vmalloc_sync_unmappings(void); | |
136 | ||
1da177e4 LT |
137 | /* |
138 | * Lowlevel-APIs (not for driver use!) | |
139 | */ | |
9585116b JF |
140 | |
141 | static inline size_t get_vm_area_size(const struct vm_struct *area) | |
142 | { | |
71394fe5 AR |
143 | if (!(area->flags & VM_NO_GUARD)) |
144 | /* return actual size without guard page */ | |
145 | return area->size - PAGE_SIZE; | |
146 | else | |
147 | return area->size; | |
148 | ||
9585116b JF |
149 | } |
150 | ||
1da177e4 | 151 | extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); |
23016969 | 152 | extern struct vm_struct *get_vm_area_caller(unsigned long size, |
5e6cafc8 | 153 | unsigned long flags, const void *caller); |
c2968612 BH |
154 | extern struct vm_struct *__get_vm_area_caller(unsigned long size, |
155 | unsigned long flags, | |
156 | unsigned long start, unsigned long end, | |
5e6cafc8 | 157 | const void *caller); |
b3bdda02 | 158 | extern struct vm_struct *remove_vm_area(const void *addr); |
e9da6e99 | 159 | extern struct vm_struct *find_vm_area(const void *addr); |
c19c03fc | 160 | |
b554cb42 | 161 | #ifdef CONFIG_MMU |
8fc48985 TH |
162 | extern int map_kernel_range_noflush(unsigned long start, unsigned long size, |
163 | pgprot_t prot, struct page **pages); | |
ed1f324c CH |
164 | int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot, |
165 | struct page **pages); | |
8fc48985 | 166 | extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); |
c19c03fc | 167 | extern void unmap_kernel_range(unsigned long addr, unsigned long size); |
868b104d RE |
168 | static inline void set_vm_flush_reset_perms(void *addr) |
169 | { | |
170 | struct vm_struct *vm = find_vm_area(addr); | |
171 | ||
172 | if (vm) | |
173 | vm->flags |= VM_FLUSH_RESET_PERMS; | |
174 | } | |
b554cb42 GY |
175 | #else |
176 | static inline int | |
177 | map_kernel_range_noflush(unsigned long start, unsigned long size, | |
178 | pgprot_t prot, struct page **pages) | |
179 | { | |
180 | return size >> PAGE_SHIFT; | |
181 | } | |
ed1f324c | 182 | #define map_kernel_range map_kernel_range_noflush |
b554cb42 GY |
183 | static inline void |
184 | unmap_kernel_range_noflush(unsigned long addr, unsigned long size) | |
185 | { | |
186 | } | |
ed1f324c | 187 | #define unmap_kernel_range unmap_kernel_range_noflush |
868b104d RE |
188 | static inline void set_vm_flush_reset_perms(void *addr) |
189 | { | |
190 | } | |
b554cb42 | 191 | #endif |
1da177e4 | 192 | |
5f4352fb | 193 | /* Allocate/destroy a 'vmalloc' VM area. */ |
cd12909c | 194 | extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); |
5f4352fb JF |
195 | extern void free_vm_area(struct vm_struct *area); |
196 | ||
69beeb1d KM |
197 | /* for /dev/kmem */ |
198 | extern long vread(char *buf, char *addr, unsigned long count); | |
199 | extern long vwrite(char *buf, char *addr, unsigned long count); | |
200 | ||
1da177e4 LT |
201 | /* |
202 | * Internals. Dont't use.. | |
203 | */ | |
f1c4069e | 204 | extern struct list_head vmap_area_list; |
be9b7335 | 205 | extern __init void vm_area_add_early(struct vm_struct *vm); |
c0c0a293 | 206 | extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); |
1da177e4 | 207 | |
4f8b02b4 | 208 | #ifdef CONFIG_SMP |
b554cb42 | 209 | # ifdef CONFIG_MMU |
ca23e405 TH |
210 | struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, |
211 | const size_t *sizes, int nr_vms, | |
ec3f64fc | 212 | size_t align); |
ca23e405 TH |
213 | |
214 | void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); | |
b554cb42 GY |
215 | # else |
216 | static inline struct vm_struct ** | |
217 | pcpu_get_vm_areas(const unsigned long *offsets, | |
218 | const size_t *sizes, int nr_vms, | |
219 | size_t align) | |
220 | { | |
221 | return NULL; | |
222 | } | |
223 | ||
224 | static inline void | |
225 | pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) | |
226 | { | |
227 | } | |
228 | # endif | |
4f8b02b4 | 229 | #endif |
ca23e405 | 230 | |
db3808c1 JK |
231 | #ifdef CONFIG_MMU |
232 | #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) | |
db3808c1 | 233 | #else |
db3808c1 | 234 | #define VMALLOC_TOTAL 0UL |
db3808c1 JK |
235 | #endif |
236 | ||
4da56b99 CW |
237 | int register_vmap_purge_notifier(struct notifier_block *nb); |
238 | int unregister_vmap_purge_notifier(struct notifier_block *nb); | |
239 | ||
1da177e4 | 240 | #endif /* _LINUX_VMALLOC_H */ |