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 <asm/page.h> /* pgprot_t */ 8 #include <linux/rbtree.h> 9 10 struct vm_area_struct; /* vma defining user mapping in mm_types.h */ 11 12 /* bits in flags of vmalloc's vm_struct below */ 13 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */ 14 #define VM_ALLOC 0x00000002 /* vmalloc() */ 15 #define VM_MAP 0x00000004 /* vmap()ed pages */ 16 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */ 17 #define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */ 18 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */ 19 #define VM_NO_GUARD 0x00000040 /* don't add guard page */ 20 #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */ 21 /* bits [20..32] reserved for arch specific ioremap internals */ 22 23 /* 24 * Maximum alignment for ioremap() regions. 25 * Can be overriden by arch-specific value. 26 */ 27 #ifndef IOREMAP_MAX_ORDER 28 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */ 29 #endif 30 31 struct vm_struct { 32 struct vm_struct *next; 33 void *addr; 34 unsigned long size; 35 unsigned long flags; 36 struct page **pages; 37 unsigned int nr_pages; 38 phys_addr_t phys_addr; 39 const void *caller; 40 }; 41 42 struct vmap_area { 43 unsigned long va_start; 44 unsigned long va_end; 45 unsigned long flags; 46 struct rb_node rb_node; /* address sorted rbtree */ 47 struct list_head list; /* address sorted list */ 48 struct list_head purge_list; /* "lazy purge" list */ 49 struct vm_struct *vm; 50 struct rcu_head rcu_head; 51 }; 52 53 /* 54 * Highlevel APIs for driver use 55 */ 56 extern void vm_unmap_ram(const void *mem, unsigned int count); 57 extern void *vm_map_ram(struct page **pages, unsigned int count, 58 int node, pgprot_t prot); 59 extern void vm_unmap_aliases(void); 60 61 #ifdef CONFIG_MMU 62 extern void __init vmalloc_init(void); 63 #else 64 static inline void vmalloc_init(void) 65 { 66 } 67 #endif 68 69 extern void *vmalloc(unsigned long size); 70 extern void *vzalloc(unsigned long size); 71 extern void *vmalloc_user(unsigned long size); 72 extern void *vmalloc_node(unsigned long size, int node); 73 extern void *vzalloc_node(unsigned long size, int node); 74 extern void *vmalloc_exec(unsigned long size); 75 extern void *vmalloc_32(unsigned long size); 76 extern void *vmalloc_32_user(unsigned long size); 77 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 78 extern void *__vmalloc_node_range(unsigned long size, unsigned long align, 79 unsigned long start, unsigned long end, gfp_t gfp_mask, 80 pgprot_t prot, unsigned long vm_flags, int node, 81 const void *caller); 82 83 extern void vfree(const void *addr); 84 85 extern void *vmap(struct page **pages, unsigned int count, 86 unsigned long flags, pgprot_t prot); 87 extern void vunmap(const void *addr); 88 89 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 90 unsigned long uaddr, void *kaddr, 91 unsigned long size); 92 93 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 94 unsigned long pgoff); 95 void vmalloc_sync_all(void); 96 97 /* 98 * Lowlevel-APIs (not for driver use!) 99 */ 100 101 static inline size_t get_vm_area_size(const struct vm_struct *area) 102 { 103 if (!(area->flags & VM_NO_GUARD)) 104 /* return actual size without guard page */ 105 return area->size - PAGE_SIZE; 106 else 107 return area->size; 108 109 } 110 111 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 112 extern struct vm_struct *get_vm_area_caller(unsigned long size, 113 unsigned long flags, const void *caller); 114 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 115 unsigned long start, unsigned long end); 116 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 117 unsigned long flags, 118 unsigned long start, unsigned long end, 119 const void *caller); 120 extern struct vm_struct *remove_vm_area(const void *addr); 121 extern struct vm_struct *find_vm_area(const void *addr); 122 123 extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 124 struct page **pages); 125 #ifdef CONFIG_MMU 126 extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 127 pgprot_t prot, struct page **pages); 128 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 129 extern void unmap_kernel_range(unsigned long addr, unsigned long size); 130 #else 131 static inline int 132 map_kernel_range_noflush(unsigned long start, unsigned long size, 133 pgprot_t prot, struct page **pages) 134 { 135 return size >> PAGE_SHIFT; 136 } 137 static inline void 138 unmap_kernel_range_noflush(unsigned long addr, unsigned long size) 139 { 140 } 141 static inline void 142 unmap_kernel_range(unsigned long addr, unsigned long size) 143 { 144 } 145 #endif 146 147 /* Allocate/destroy a 'vmalloc' VM area. */ 148 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); 149 extern void free_vm_area(struct vm_struct *area); 150 151 /* for /dev/kmem */ 152 extern long vread(char *buf, char *addr, unsigned long count); 153 extern long vwrite(char *buf, char *addr, unsigned long count); 154 155 /* 156 * Internals. Dont't use.. 157 */ 158 extern struct list_head vmap_area_list; 159 extern __init void vm_area_add_early(struct vm_struct *vm); 160 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 161 162 #ifdef CONFIG_SMP 163 # ifdef CONFIG_MMU 164 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 165 const size_t *sizes, int nr_vms, 166 size_t align); 167 168 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 169 # else 170 static inline struct vm_struct ** 171 pcpu_get_vm_areas(const unsigned long *offsets, 172 const size_t *sizes, int nr_vms, 173 size_t align) 174 { 175 return NULL; 176 } 177 178 static inline void 179 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 180 { 181 } 182 # endif 183 #endif 184 185 struct vmalloc_info { 186 unsigned long used; 187 unsigned long largest_chunk; 188 }; 189 190 #ifdef CONFIG_MMU 191 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 192 extern void get_vmalloc_info(struct vmalloc_info *vmi); 193 #else 194 195 #define VMALLOC_TOTAL 0UL 196 #define get_vmalloc_info(vmi) \ 197 do { \ 198 (vmi)->used = 0; \ 199 (vmi)->largest_chunk = 0; \ 200 } while (0) 201 #endif 202 203 #endif /* _LINUX_VMALLOC_H */ 204