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 unsigned long flags; 54 struct rb_node rb_node; /* address sorted rbtree */ 55 struct list_head list; /* address sorted list */ 56 struct llist_node purge_list; /* "lazy purge" list */ 57 struct vm_struct *vm; 58 struct rcu_head rcu_head; 59 }; 60 61 /* 62 * Highlevel APIs for driver use 63 */ 64 extern void vm_unmap_ram(const void *mem, unsigned int count); 65 extern void *vm_map_ram(struct page **pages, unsigned int count, 66 int node, pgprot_t prot); 67 extern void vm_unmap_aliases(void); 68 69 #ifdef CONFIG_MMU 70 extern void __init vmalloc_init(void); 71 #else 72 static inline void vmalloc_init(void) 73 { 74 } 75 #endif 76 77 extern void *vmalloc(unsigned long size); 78 extern void *vzalloc(unsigned long size); 79 extern void *vmalloc_user(unsigned long size); 80 extern void *vmalloc_node(unsigned long size, int node); 81 extern void *vzalloc_node(unsigned long size, int node); 82 extern void *vmalloc_exec(unsigned long size); 83 extern void *vmalloc_32(unsigned long size); 84 extern void *vmalloc_32_user(unsigned long size); 85 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 86 extern void *__vmalloc_node_range(unsigned long size, unsigned long align, 87 unsigned long start, unsigned long end, gfp_t gfp_mask, 88 pgprot_t prot, unsigned long vm_flags, int node, 89 const void *caller); 90 #ifndef CONFIG_MMU 91 extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags); 92 static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, 93 gfp_t flags, void *caller) 94 { 95 return __vmalloc_node_flags(size, node, flags); 96 } 97 #else 98 extern void *__vmalloc_node_flags_caller(unsigned long size, 99 int node, gfp_t flags, void *caller); 100 #endif 101 102 extern void vfree(const void *addr); 103 extern void vfree_atomic(const void *addr); 104 105 extern void *vmap(struct page **pages, unsigned int count, 106 unsigned long flags, pgprot_t prot); 107 extern void vunmap(const void *addr); 108 109 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 110 unsigned long uaddr, void *kaddr, 111 unsigned long size); 112 113 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 114 unsigned long pgoff); 115 void vmalloc_sync_all(void); 116 117 /* 118 * Lowlevel-APIs (not for driver use!) 119 */ 120 121 static inline size_t get_vm_area_size(const struct vm_struct *area) 122 { 123 if (!(area->flags & VM_NO_GUARD)) 124 /* return actual size without guard page */ 125 return area->size - PAGE_SIZE; 126 else 127 return area->size; 128 129 } 130 131 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 132 extern struct vm_struct *get_vm_area_caller(unsigned long size, 133 unsigned long flags, const void *caller); 134 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 135 unsigned long start, unsigned long end); 136 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 137 unsigned long flags, 138 unsigned long start, unsigned long end, 139 const void *caller); 140 extern struct vm_struct *remove_vm_area(const void *addr); 141 extern struct vm_struct *find_vm_area(const void *addr); 142 143 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 144 struct page **pages); 145 #ifdef CONFIG_MMU 146 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 147 pgprot_t prot, struct page **pages); 148 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 149 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 150 static inline void set_vm_flush_reset_perms(void *addr) 151 { 152 struct vm_struct *vm = find_vm_area(addr); 153 154 if (vm) 155 vm->flags |= VM_FLUSH_RESET_PERMS; 156 } 157 #else 158 static inline int 159 map_kernel_range_noflush(unsigned long start, unsigned long size, 160 pgprot_t prot, struct page **pages) 161 { 162 return size >> PAGE_SHIFT; 163 } 164 static inline void 165 unmap_kernel_range_noflush(unsigned long addr, unsigned long size) 166 { 167 } 168 static inline void 169 unmap_kernel_range(unsigned long addr, unsigned long size) 170 { 171 } 172 static inline void set_vm_flush_reset_perms(void *addr) 173 { 174 } 175 #endif 176 177 /* Allocate/destroy a 'vmalloc' VM area. */ 178 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); 179 extern void free_vm_area(struct vm_struct *area); 180 181 /* for /dev/kmem */ 182 extern long vread(char *buf, char *addr, unsigned long count); 183 extern long vwrite(char *buf, char *addr, unsigned long count); 184 185 /* 186 * Internals. Dont't use.. 187 */ 188 extern struct list_head vmap_area_list; 189 extern __init void vm_area_add_early(struct vm_struct *vm); 190 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 191 192 #ifdef CONFIG_SMP 193 # ifdef CONFIG_MMU 194 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 195 const size_t *sizes, int nr_vms, 196 size_t align); 197 198 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 199 # else 200 static inline struct vm_struct ** 201 pcpu_get_vm_areas(const unsigned long *offsets, 202 const size_t *sizes, int nr_vms, 203 size_t align) 204 { 205 return NULL; 206 } 207 208 static inline void 209 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 210 { 211 } 212 # endif 213 #endif 214 215 #ifdef CONFIG_MMU 216 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 217 #else 218 #define VMALLOC_TOTAL 0UL 219 #endif 220 221 int register_vmap_purge_notifier(struct notifier_block *nb); 222 int unregister_vmap_purge_notifier(struct notifier_block *nb); 223 224 #endif /* _LINUX_VMALLOC_H */ 225