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