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
  20 #if defined(CONFIG_X86) && defined(CONFIG_PAX_KERNEXEC)
  21 #define VM_KERNEXEC             0x00000040      /* allocate from executable kernel memory range */
  22 #endif
  23
  24 /* bits [20..32] reserved for arch specific ioremap internals */
  25
  26 /*
  27  * Maximum alignment for ioremap() regions.
  28  * Can be overriden by arch-specific value.
  29  */
  30 #ifndef IOREMAP_MAX_ORDER
  31 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  32 #endif
  33
  34 struct vm_struct {
  35         struct vm_struct        *next;
  36         void                    *addr;
  37         unsigned long           size;
  38         unsigned long           flags;
  39         struct page             **pages;
  40         unsigned int            nr_pages;
  41         phys_addr_t             phys_addr;
  42         const void              *caller;
  43 };
  44
  45 struct vmap_area {
  46         unsigned long va_start;
  47         unsigned long va_end;
  48         unsigned long flags;
  49         struct rb_node rb_node;         /* address sorted rbtree */
  50         struct list_head list;          /* address sorted list */
  51         struct list_head purge_list;    /* "lazy purge" list */
  52         struct vm_struct *vm;
  53         struct rcu_head rcu_head;
  54 };
  55
  56 /*
  57  *      Highlevel APIs for driver use
  58  */
  59 extern void vm_unmap_ram(const void *mem, unsigned int count);
  60 extern void *vm_map_ram(struct page **pages, unsigned int count,
  61                                 int node, pgprot_t prot);
  62 extern void vm_unmap_aliases(void);
  63
  64 #ifdef CONFIG_MMU
  65 extern void __init vmalloc_init(void);
  66 #else
  67 static inline void vmalloc_init(void)
  68 {
  69 }
  70 #endif
  71
  72 extern void *vmalloc(unsigned long size);
  73 extern void *vzalloc(unsigned long size);
  74 extern void *vmalloc_user(unsigned long size);
  75 extern void *vmalloc_node(unsigned long size, int node);
  76 extern void *vzalloc_node(unsigned long size, int node);
  77 extern void *vmalloc_exec(unsigned long size);
  78 extern void *vmalloc_32(unsigned long size);
  79 extern void *vmalloc_32_user(unsigned long size);
  80 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  81 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
  82                         unsigned long start, unsigned long end, gfp_t gfp_mask,
  83                         pgprot_t prot, int node, const void *caller);
  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 #ifdef CONFIG_GRKERNSEC_KSTACKOVERFLOW
  91 extern void unmap_process_stacks(struct task_struct *task);
  92 #endif
  93
  94 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
  95                                        unsigned long uaddr, void *kaddr,
  96                                        unsigned long size);
  97
  98 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
  99                                                         unsigned long pgoff);
 100 void vmalloc_sync_all(void);
 101
 102 /*
 103  *      Lowlevel-APIs (not for driver use!)
 104  */
 105
 106 static inline size_t get_vm_area_size(const struct vm_struct *area)
 107 {
 108         /* return actual size without guard page */
 109         return area->size - PAGE_SIZE;
 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) __size_overflow(3);
 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 struct vmalloc_info {
 187         unsigned long   used;
 188         unsigned long   largest_chunk;
 189 };
 190
 191 #ifdef CONFIG_MMU
 192 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
 193 extern void get_vmalloc_info(struct vmalloc_info *vmi);
 194 #else
 195
 196 #define VMALLOC_TOTAL 0UL
 197 #define get_vmalloc_info(vmi)                   \
 198 do {                                            \
 199         (vmi)->used = 0;                        \
 200         (vmi)->largest_chunk = 0;               \
 201 } while (0)
 202 #endif
 203
 204 #endif /* _LINUX_VMALLOC_H */