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_DMA_COHERENT 0x00000010 /* dma_alloc_coherent */ 22 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */ 23 #define VM_NO_GUARD 0x00000040 /* don't add guard page */ 24 #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */ 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 */ 30 31 /* bits [20..32] reserved for arch specific ioremap internals */ 32 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 41 struct vm_struct { 42 struct vm_struct *next; 43 void *addr; 44 unsigned long size; 45 unsigned long flags; 46 struct page **pages; 47 unsigned int nr_pages; 48 phys_addr_t phys_addr; 49 const void *caller; 50 }; 51 52 struct vmap_area { 53 unsigned long va_start; 54 unsigned long va_end; 55 56 /* 57 * Largest available free size in subtree. 58 */ 59 unsigned long subtree_max_size; 60 unsigned long flags; 61 struct rb_node rb_node; /* address sorted rbtree */ 62 struct list_head list; /* address sorted list */ 63 struct llist_node purge_list; /* "lazy purge" list */ 64 struct vm_struct *vm; 65 }; 66 67 /* 68 * Highlevel APIs for driver use 69 */ 70 extern void vm_unmap_ram(const void *mem, unsigned int count); 71 extern void *vm_map_ram(struct page **pages, unsigned int count, 72 int node, pgprot_t prot); 73 extern void vm_unmap_aliases(void); 74 75 #ifdef CONFIG_MMU 76 extern void __init vmalloc_init(void); 77 extern unsigned long vmalloc_nr_pages(void); 78 #else 79 static inline void vmalloc_init(void) 80 { 81 } 82 static inline unsigned long vmalloc_nr_pages(void) { return 0; } 83 #endif 84 85 extern void *vmalloc(unsigned long size); 86 extern void *vzalloc(unsigned long size); 87 extern void *vmalloc_user(unsigned long size); 88 extern void *vmalloc_node(unsigned long size, int node); 89 extern void *vzalloc_node(unsigned long size, int node); 90 extern void *vmalloc_exec(unsigned long size); 91 extern void *vmalloc_32(unsigned long size); 92 extern void *vmalloc_32_user(unsigned long size); 93 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 94 extern void *__vmalloc_node_range(unsigned long size, unsigned long align, 95 unsigned long start, unsigned long end, gfp_t gfp_mask, 96 pgprot_t prot, unsigned long vm_flags, int node, 97 const void *caller); 98 #ifndef CONFIG_MMU 99 extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags); 100 static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, 101 gfp_t flags, void *caller) 102 { 103 return __vmalloc_node_flags(size, node, flags); 104 } 105 #else 106 extern void *__vmalloc_node_flags_caller(unsigned long size, 107 int node, gfp_t flags, void *caller); 108 #endif 109 110 extern void vfree(const void *addr); 111 extern void vfree_atomic(const void *addr); 112 113 extern void *vmap(struct page **pages, unsigned int count, 114 unsigned long flags, pgprot_t prot); 115 extern void vunmap(const void *addr); 116 117 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 118 unsigned long uaddr, void *kaddr, 119 unsigned long size); 120 121 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 122 unsigned long pgoff); 123 void vmalloc_sync_all(void); 124 125 /* 126 * Lowlevel-APIs (not for driver use!) 127 */ 128 129 static inline size_t get_vm_area_size(const struct vm_struct *area) 130 { 131 if (!(area->flags & VM_NO_GUARD)) 132 /* return actual size without guard page */ 133 return area->size - PAGE_SIZE; 134 else 135 return area->size; 136 137 } 138 139 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 140 extern struct vm_struct *get_vm_area_caller(unsigned long size, 141 unsigned long flags, const void *caller); 142 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 143 unsigned long start, unsigned long end); 144 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 145 unsigned long flags, 146 unsigned long start, unsigned long end, 147 const void *caller); 148 extern struct vm_struct *remove_vm_area(const void *addr); 149 extern struct vm_struct *find_vm_area(const void *addr); 150 151 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 152 struct page **pages); 153 #ifdef CONFIG_MMU 154 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 155 pgprot_t prot, struct page **pages); 156 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 157 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 158 static inline void set_vm_flush_reset_perms(void *addr) 159 { 160 struct vm_struct *vm = find_vm_area(addr); 161 162 if (vm) 163 vm->flags |= VM_FLUSH_RESET_PERMS; 164 } 165 #else 166 static inline int 167 map_kernel_range_noflush(unsigned long start, unsigned long size, 168 pgprot_t prot, struct page **pages) 169 { 170 return size >> PAGE_SHIFT; 171 } 172 static inline void 173 unmap_kernel_range_noflush(unsigned long addr, unsigned long size) 174 { 175 } 176 static inline void 177 unmap_kernel_range(unsigned long addr, unsigned long size) 178 { 179 } 180 static inline void set_vm_flush_reset_perms(void *addr) 181 { 182 } 183 #endif 184 185 /* Allocate/destroy a 'vmalloc' VM area. */ 186 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); 187 extern void free_vm_area(struct vm_struct *area); 188 189 /* for /dev/kmem */ 190 extern long vread(char *buf, char *addr, unsigned long count); 191 extern long vwrite(char *buf, char *addr, unsigned long count); 192 193 /* 194 * Internals. Dont't use.. 195 */ 196 extern struct list_head vmap_area_list; 197 extern __init void vm_area_add_early(struct vm_struct *vm); 198 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 199 200 #ifdef CONFIG_SMP 201 # ifdef CONFIG_MMU 202 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 203 const size_t *sizes, int nr_vms, 204 size_t align); 205 206 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 207 # else 208 static inline struct vm_struct ** 209 pcpu_get_vm_areas(const unsigned long *offsets, 210 const size_t *sizes, int nr_vms, 211 size_t align) 212 { 213 return NULL; 214 } 215 216 static inline void 217 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 218 { 219 } 220 # endif 221 #endif 222 223 #ifdef CONFIG_MMU 224 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 225 #else 226 #define VMALLOC_TOTAL 0UL 227 #endif 228 229 int register_vmap_purge_notifier(struct notifier_block *nb); 230 int unregister_vmap_purge_notifier(struct notifier_block *nb); 231 232 #endif /* _LINUX_VMALLOC_H */ 233