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