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 10struct 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 31struct 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 42struct 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 */ 56extern void vm_unmap_ram(const void *mem, unsigned int count); 57extern void *vm_map_ram(struct page **pages, unsigned int count, 58 int node, pgprot_t prot); 59extern void vm_unmap_aliases(void); 60 61#ifdef CONFIG_MMU 62extern void __init vmalloc_init(void); 63#else 64static inline void vmalloc_init(void) 65{ 66} 67#endif 68 69extern void *vmalloc(unsigned long size); 70extern void *vzalloc(unsigned long size); 71extern void *vmalloc_user(unsigned long size); 72extern void *vmalloc_node(unsigned long size, int node); 73extern void *vzalloc_node(unsigned long size, int node); 74extern void *vmalloc_exec(unsigned long size); 75extern void *vmalloc_32(unsigned long size); 76extern void *vmalloc_32_user(unsigned long size); 77extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot); 78extern 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 83extern void vfree(const void *addr); 84 85extern void *vmap(struct page **pages, unsigned int count, 86 unsigned long flags, pgprot_t prot); 87extern void vunmap(const void *addr); 88 89extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 90 unsigned long uaddr, void *kaddr, 91 unsigned long size); 92 93extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 94 unsigned long pgoff); 95void vmalloc_sync_all(void); 96 97/* 98 * Lowlevel-APIs (not for driver use!) 99 */ 100 101static 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 111extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 112extern struct vm_struct *get_vm_area_caller(unsigned long size, 113 unsigned long flags, const void *caller); 114extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags, 115 unsigned long start, unsigned long end); 116extern 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); 120extern struct vm_struct *remove_vm_area(const void *addr); 121extern struct vm_struct *find_vm_area(const void *addr); 122 123extern int map_vm_area(struct vm_struct *area, pgprot_t prot, 124 struct page **pages); 125#ifdef CONFIG_MMU 126extern int map_kernel_range_noflush(unsigned long start, unsigned long size, 127 pgprot_t prot, struct page **pages); 128extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size); 129extern void unmap_kernel_range(unsigned long addr, unsigned long size); 130#else 131static inline int 132map_kernel_range_noflush(unsigned long start, unsigned long size, 133 pgprot_t prot, struct page **pages) 134{ 135 return size >> PAGE_SHIFT; 136} 137static inline void 138unmap_kernel_range_noflush(unsigned long addr, unsigned long size) 139{ 140} 141static inline void 142unmap_kernel_range(unsigned long addr, unsigned long size) 143{ 144} 145#endif 146 147/* Allocate/destroy a 'vmalloc' VM area. */ 148extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); 149extern void free_vm_area(struct vm_struct *area); 150 151/* for /dev/kmem */ 152extern long vread(char *buf, char *addr, unsigned long count); 153extern long vwrite(char *buf, char *addr, unsigned long count); 154 155/* 156 * Internals. Dont't use.. 157 */ 158extern struct list_head vmap_area_list; 159extern __init void vm_area_add_early(struct vm_struct *vm); 160extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 161 162#ifdef CONFIG_SMP 163# ifdef CONFIG_MMU 164struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 165 const size_t *sizes, int nr_vms, 166 size_t align); 167 168void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 169# else 170static inline struct vm_struct ** 171pcpu_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 178static inline void 179pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 180{ 181} 182# endif 183#endif 184 185struct 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) 192extern void get_vmalloc_info(struct vmalloc_info *vmi); 193#else 194 195#define VMALLOC_TOTAL 0UL 196#define get_vmalloc_info(vmi) \ 197do { \ 198 (vmi)->used = 0; \ 199 (vmi)->largest_chunk = 0; \ 200} while (0) 201#endif 202 203#endif /* _LINUX_VMALLOC_H */ 204