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 84 extern void vfree(const void *addr); 85 extern void vfree_atomic(const void *addr); 86 87 extern void *vmap(struct page **pages, unsigned int count, 88 unsigned long flags, pgprot_t prot); 89 extern void vunmap(const void *addr); 90 91 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 92 unsigned long uaddr, void *kaddr, 93 unsigned long size); 94 95 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 96 unsigned long pgoff); 97 void vmalloc_sync_all(void); 98 99 /* 100 * Lowlevel-APIs (not for driver use!) 101 */ 102 103 static inline size_t get_vm_area_size(const struct vm_struct *area) 104 { 105 if (!(area->flags & VM_NO_GUARD)) 106 /* return actual size without guard page */ 107 return area->size - PAGE_SIZE; 108 else 109 return area->size; 110 111 } 112 113 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 114 extern struct vm_struct *get_vm_area_caller(unsigned long size, 115 unsigned long flags, const void *caller); 116 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 117 unsigned long start, unsigned long end); 118 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 119 unsigned long flags, 120 unsigned long start, unsigned long end, 121 const void *caller); 122 extern struct vm_struct *remove_vm_area(const void *addr); 123 extern struct vm_struct *find_vm_area(const void *addr); 124 125 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 126 struct page **pages); 127 #ifdef CONFIG_MMU 128 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 129 pgprot_t prot, struct page **pages); 130 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 131 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 132 #else 133 static inline int 134 map_kernel_range_noflush(unsigned long start, unsigned long size, 135 pgprot_t prot, struct page **pages) 136 { 137 return size >> PAGE_SHIFT; 138 } 139 static inline void 140 unmap_kernel_range_noflush(unsigned long addr, unsigned long size) 141 { 142 } 143 static inline void 144 unmap_kernel_range(unsigned long addr, unsigned long size) 145 { 146 } 147 #endif 148 149 /* Allocate/destroy a 'vmalloc' VM area. */ 150 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); 151 extern void free_vm_area(struct vm_struct *area); 152 153 /* for /dev/kmem */ 154 extern long vread(char *buf, char *addr, unsigned long count); 155 extern long vwrite(char *buf, char *addr, unsigned long count); 156 157 /* 158 * Internals. Dont't use.. 159 */ 160 extern struct list_head vmap_area_list; 161 extern __init void vm_area_add_early(struct vm_struct *vm); 162 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 163 164 #ifdef CONFIG_SMP 165 # ifdef CONFIG_MMU 166 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 167 const size_t *sizes, int nr_vms, 168 size_t align); 169 170 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 171 # else 172 static inline struct vm_struct ** 173 pcpu_get_vm_areas(const unsigned long *offsets, 174 const size_t *sizes, int nr_vms, 175 size_t align) 176 { 177 return NULL; 178 } 179 180 static inline void 181 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 182 { 183 } 184 # endif 185 #endif 186 187 #ifdef CONFIG_MMU 188 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 189 #else 190 #define VMALLOC_TOTAL 0UL 191 #endif 192 193 int register_vmap_purge_notifier(struct notifier_block *nb); 194 int unregister_vmap_purge_notifier(struct notifier_block *nb); 195 196 #endif /* _LINUX_VMALLOC_H */ 197