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