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