1 #ifndef _LINUX_VMALLOC_H 2 #define _LINUX_VMALLOC_H 3 4 #include <linux/spinlock.h> 5 #include <linux/init.h> 6 #include <linux/list.h> 7 #include <linux/llist.h> 8 #include <asm/page.h> /* pgprot_t */ 9 #include <linux/rbtree.h> 10 11 struct vm_area_struct; /* vma defining user mapping in mm_types.h */ 12 struct notifier_block; /* in notifier.h */ 13 14 /* bits in flags of vmalloc's vm_struct below */ 15 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */ 16 #define VM_ALLOC 0x00000002 /* vmalloc() */ 17 #define VM_MAP 0x00000004 /* vmap()ed pages */ 18 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */ 19 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */ 20 #define VM_NO_GUARD 0x00000040 /* don't add guard page */ 21 #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */ 22 /* bits [20..32] reserved for arch specific ioremap internals */ 23 24 /* 25 * Maximum alignment for ioremap() regions. 26 * Can be overriden by arch-specific value. 27 */ 28 #ifndef IOREMAP_MAX_ORDER 29 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ 30 #endif 31 32 struct vm_struct { 33 struct vm_struct *next; 34 void *addr; 35 unsigned long size; 36 unsigned long flags; 37 struct page **pages; 38 unsigned int nr_pages; 39 phys_addr_t phys_addr; 40 const void *caller; 41 }; 42 43 struct vmap_area { 44 unsigned long va_start; 45 unsigned long va_end; 46 unsigned long flags; 47 struct rb_node rb_node; /* address sorted rbtree */ 48 struct list_head list; /* address sorted list */ 49 struct llist_node purge_list; /* "lazy purge" list */ 50 struct vm_struct *vm; 51 struct rcu_head rcu_head; 52 }; 53 54 /* 55 * Highlevel APIs for driver use 56 */ 57 extern void vm_unmap_ram(const void *mem, unsigned int count); 58 extern void *vm_map_ram(struct page **pages, unsigned int count, 59 int node, pgprot_t prot); 60 extern void vm_unmap_aliases(void); 61 62 #ifdef CONFIG_MMU 63 extern void __init vmalloc_init(void); 64 #else 65 static inline void vmalloc_init(void) 66 { 67 } 68 #endif 69 70 extern void *vmalloc(unsigned long size); 71 extern void *vzalloc(unsigned long size); 72 extern void *vmalloc_user(unsigned long size); 73 extern void *vmalloc_node(unsigned long size, int node); 74 extern void *vzalloc_node(unsigned long size, int node); 75 extern void *vmalloc_exec(unsigned long size); 76 extern void *vmalloc_32(unsigned long size); 77 extern void *vmalloc_32_user(unsigned long size); 78 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 79 extern void *__vmalloc_node_range(unsigned long size, unsigned long align, 80 unsigned long start, unsigned long end, gfp_t gfp_mask, 81 pgprot_t prot, unsigned long vm_flags, int node, 82 const void *caller); 83 #ifndef CONFIG_MMU 84 extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags); 85 static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, 86 gfp_t flags, void *caller) 87 { 88 return __vmalloc_node_flags(size, node, flags); 89 } 90 #else 91 extern void *__vmalloc_node_flags_caller(unsigned long size, 92 int node, gfp_t flags, void *caller); 93 #endif 94 95 extern void vfree(const void *addr); 96 extern void vfree_atomic(const void *addr); 97 98 extern void *vmap(struct page **pages, unsigned int count, 99 unsigned long flags, pgprot_t prot); 100 extern void vunmap(const void *addr); 101 102 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 103 unsigned long uaddr, void *kaddr, 104 unsigned long size); 105 106 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 107 unsigned long pgoff); 108 void vmalloc_sync_all(void); 109 110 /* 111 * Lowlevel-APIs (not for driver use!) 112 */ 113 114 static inline size_t get_vm_area_size(const struct vm_struct *area) 115 { 116 if (!(area->flags & VM_NO_GUARD)) 117 /* return actual size without guard page */ 118 return area->size - PAGE_SIZE; 119 else 120 return area->size; 121 122 } 123 124 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 125 extern struct vm_struct *get_vm_area_caller(unsigned long size, 126 unsigned long flags, const void *caller); 127 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 128 unsigned long start, unsigned long end); 129 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 130 unsigned long flags, 131 unsigned long start, unsigned long end, 132 const void *caller); 133 extern struct vm_struct *remove_vm_area(const void *addr); 134 extern struct vm_struct *find_vm_area(const void *addr); 135 136 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 137 struct page **pages); 138 #ifdef CONFIG_MMU 139 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 140 pgprot_t prot, struct page **pages); 141 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 142 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 143 #else 144 static inline int 145 map_kernel_range_noflush(unsigned long start, unsigned long size, 146 pgprot_t prot, struct page **pages) 147 { 148 return size >> PAGE_SHIFT; 149 } 150 static inline void 151 unmap_kernel_range_noflush(unsigned long addr, unsigned long size) 152 { 153 } 154 static inline void 155 unmap_kernel_range(unsigned long addr, unsigned long size) 156 { 157 } 158 #endif 159 160 /* Allocate/destroy a 'vmalloc' VM area. */ 161 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); 162 extern void free_vm_area(struct vm_struct *area); 163 164 /* for /dev/kmem */ 165 extern long vread(char *buf, char *addr, unsigned long count); 166 extern long vwrite(char *buf, char *addr, unsigned long count); 167 168 /* 169 * Internals. Dont't use.. 170 */ 171 extern struct list_head vmap_area_list; 172 extern __init void vm_area_add_early(struct vm_struct *vm); 173 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 174 175 #ifdef CONFIG_SMP 176 # ifdef CONFIG_MMU 177 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 178 const size_t *sizes, int nr_vms, 179 size_t align); 180 181 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 182 # else 183 static inline struct vm_struct ** 184 pcpu_get_vm_areas(const unsigned long *offsets, 185 const size_t *sizes, int nr_vms, 186 size_t align) 187 { 188 return NULL; 189 } 190 191 static inline void 192 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 193 { 194 } 195 # endif 196 #endif 197 198 #ifdef CONFIG_MMU 199 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 200 #else 201 #define VMALLOC_TOTAL 0UL 202 #endif 203 204 int register_vmap_purge_notifier(struct notifier_block *nb); 205 int unregister_vmap_purge_notifier(struct notifier_block *nb); 206 207 #endif /* _LINUX_VMALLOC_H */ 208