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