1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_VMALLOC_H 3 #define _LINUX_VMALLOC_H 4 5 #include <linux/spinlock.h> 6 #include <linux/init.h> 7 #include <linux/list.h> 8 #include <linux/llist.h> 9 #include <asm/page.h> /* pgprot_t */ 10 #include <linux/rbtree.h> 11 #include <linux/overflow.h> 12 13 struct vm_area_struct; /* vma defining user mapping in mm_types.h */ 14 struct notifier_block; /* in notifier.h */ 15 16 /* bits in flags of vmalloc's vm_struct below */ 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 */ 21 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */ 22 #define VM_NO_GUARD 0x00000040 /* don't add guard page */ 23 #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */ 24 /* 25 * Memory with VM_FLUSH_RESET_PERMS cannot be freed in an interrupt or with 26 * vfree_atomic(). 27 */ 28 #define VM_FLUSH_RESET_PERMS 0x00000100 /* Reset direct map and flush TLB on unmap */ 29 /* bits [20..32] reserved for arch specific ioremap internals */ 30 31 /* 32 * Maximum alignment for ioremap() regions. 33 * Can be overriden by arch-specific value. 34 */ 35 #ifndef IOREMAP_MAX_ORDER 36 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ 37 #endif 38 39 struct vm_struct { 40 struct vm_struct *next; 41 void *addr; 42 unsigned long size; 43 unsigned long flags; 44 struct page **pages; 45 unsigned int nr_pages; 46 phys_addr_t phys_addr; 47 const void *caller; 48 }; 49 50 struct vmap_area { 51 unsigned long va_start; 52 unsigned long va_end; 53 54 /* 55 * Largest available free size in subtree. 56 */ 57 unsigned long subtree_max_size; 58 unsigned long flags; 59 struct rb_node rb_node; /* address sorted rbtree */ 60 struct list_head list; /* address sorted list */ 61 struct llist_node purge_list; /* "lazy purge" list */ 62 struct vm_struct *vm; 63 }; 64 65 /* 66 * Highlevel APIs for driver use 67 */ 68 extern void vm_unmap_ram(const void *mem, unsigned int count); 69 extern void *vm_map_ram(struct page **pages, unsigned int count, 70 int node, pgprot_t prot); 71 extern void vm_unmap_aliases(void); 72 73 #ifdef CONFIG_MMU 74 extern void __init vmalloc_init(void); 75 #else 76 static inline void vmalloc_init(void) 77 { 78 } 79 #endif 80 81 extern void *vmalloc(unsigned long size); 82 extern void *vzalloc(unsigned long size); 83 extern void *vmalloc_user(unsigned long size); 84 extern void *vmalloc_node(unsigned long size, int node); 85 extern void *vzalloc_node(unsigned long size, int node); 86 extern void *vmalloc_exec(unsigned long size); 87 extern void *vmalloc_32(unsigned long size); 88 extern void *vmalloc_32_user(unsigned long size); 89 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 90 extern void *__vmalloc_node_range(unsigned long size, unsigned long align, 91 unsigned long start, unsigned long end, gfp_t gfp_mask, 92 pgprot_t prot, unsigned long vm_flags, int node, 93 const void *caller); 94 #ifndef CONFIG_MMU 95 extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags); 96 static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, 97 gfp_t flags, void *caller) 98 { 99 return __vmalloc_node_flags(size, node, flags); 100 } 101 #else 102 extern void *__vmalloc_node_flags_caller(unsigned long size, 103 int node, gfp_t flags, void *caller); 104 #endif 105 106 extern void vfree(const void *addr); 107 extern void vfree_atomic(const void *addr); 108 109 extern void *vmap(struct page **pages, unsigned int count, 110 unsigned long flags, pgprot_t prot); 111 extern void vunmap(const void *addr); 112 113 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 114 unsigned long uaddr, void *kaddr, 115 unsigned long size); 116 117 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 118 unsigned long pgoff); 119 void vmalloc_sync_all(void); 120 121 /* 122 * Lowlevel-APIs (not for driver use!) 123 */ 124 125 static inline size_t get_vm_area_size(const struct vm_struct *area) 126 { 127 if (!(area->flags & VM_NO_GUARD)) 128 /* return actual size without guard page */ 129 return area->size - PAGE_SIZE; 130 else 131 return area->size; 132 133 } 134 135 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 136 extern struct vm_struct *get_vm_area_caller(unsigned long size, 137 unsigned long flags, const void *caller); 138 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 139 unsigned long start, unsigned long end); 140 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 141 unsigned long flags, 142 unsigned long start, unsigned long end, 143 const void *caller); 144 extern struct vm_struct *remove_vm_area(const void *addr); 145 extern struct vm_struct *find_vm_area(const void *addr); 146 147 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 148 struct page **pages); 149 #ifdef CONFIG_MMU 150 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 151 pgprot_t prot, struct page **pages); 152 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 153 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 154 static inline void set_vm_flush_reset_perms(void *addr) 155 { 156 struct vm_struct *vm = find_vm_area(addr); 157 158 if (vm) 159 vm->flags |= VM_FLUSH_RESET_PERMS; 160 } 161 #else 162 static inline int 163 map_kernel_range_noflush(unsigned long start, unsigned long size, 164 pgprot_t prot, struct page **pages) 165 { 166 return size >> PAGE_SHIFT; 167 } 168 static inline void 169 unmap_kernel_range_noflush(unsigned long addr, unsigned long size) 170 { 171 } 172 static inline void 173 unmap_kernel_range(unsigned long addr, unsigned long size) 174 { 175 } 176 static inline void set_vm_flush_reset_perms(void *addr) 177 { 178 } 179 #endif 180 181 /* Allocate/destroy a 'vmalloc' VM area. */ 182 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); 183 extern void free_vm_area(struct vm_struct *area); 184 185 /* for /dev/kmem */ 186 extern long vread(char *buf, char *addr, unsigned long count); 187 extern long vwrite(char *buf, char *addr, unsigned long count); 188 189 /* 190 * Internals. Dont't use.. 191 */ 192 extern struct list_head vmap_area_list; 193 extern __init void vm_area_add_early(struct vm_struct *vm); 194 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 195 196 #ifdef CONFIG_SMP 197 # ifdef CONFIG_MMU 198 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 199 const size_t *sizes, int nr_vms, 200 size_t align); 201 202 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 203 # else 204 static inline struct vm_struct ** 205 pcpu_get_vm_areas(const unsigned long *offsets, 206 const size_t *sizes, int nr_vms, 207 size_t align) 208 { 209 return NULL; 210 } 211 212 static inline void 213 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 214 { 215 } 216 # endif 217 #endif 218 219 #ifdef CONFIG_MMU 220 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 221 #else 222 #define VMALLOC_TOTAL 0UL 223 #endif 224 225 int register_vmap_purge_notifier(struct notifier_block *nb); 226 int unregister_vmap_purge_notifier(struct notifier_block *nb); 227 228 #endif /* _LINUX_VMALLOC_H */ 229