include/linux/vmalloc.h

   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 */