include/linux/vmalloc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_VMALLOC_H
   3 #define _LINUX_VMALLOC_H
   4
   5 #include <linux/spinlock.h>
   6 #include <linux/init.h>
   7 #include <linux/list.h>
   8 #include <linux/llist.h>
   9 #include <asm/page.h>           /* pgprot_t */
  10 #include <linux/rbtree.h>
  11
  12 struct vm_area_struct;          /* vma defining user mapping in mm_types.h */
  13 struct notifier_block;          /* in notifier.h */
  14
  15 /* bits in flags of vmalloc's vm_struct below */
  16 #define VM_IOREMAP              0x00000001      /* ioremap() and friends */
  17 #define VM_ALLOC                0x00000002      /* vmalloc() */
  18 #define VM_MAP                  0x00000004      /* vmap()ed pages */
  19 #define VM_USERMAP              0x00000008      /* suitable for remap_vmalloc_range */
  20 #define VM_UNINITIALIZED        0x00000020      /* vm_struct is not fully initialized */
  21 #define VM_NO_GUARD             0x00000040      /* don't add guard page */
  22 #define VM_KASAN                0x00000080      /* has allocated kasan shadow memory */
  23 /* bits [20..32] reserved for arch specific ioremap internals */
  24
  25 /*
  26  * Maximum alignment for ioremap() regions.
  27  * Can be overriden by arch-specific value.
  28  */
  29 #ifndef IOREMAP_MAX_ORDER
  30 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  31 #endif
  32
  33 struct vm_struct {
  34         struct vm_struct        *next;
  35         void                    *addr;
  36         unsigned long           size;
  37         unsigned long           flags;
  38         struct page             **pages;
  39         unsigned int            nr_pages;
  40         phys_addr_t             phys_addr;
  41         const void              *caller;
  42 };
  43
  44 struct vmap_area {
  45         unsigned long va_start;
  46         unsigned long va_end;
  47         unsigned long flags;
  48         struct rb_node rb_node;         /* address sorted rbtree */
  49         struct list_head list;          /* address sorted list */
  50         struct llist_node purge_list;    /* "lazy purge" list */
  51         struct vm_struct *vm;
  52         struct rcu_head rcu_head;
  53 };
  54
  55 /*
  56  *      Highlevel APIs for driver use
  57  */
  58 extern void vm_unmap_ram(const void *mem, unsigned int count);
  59 extern void *vm_map_ram(struct page **pages, unsigned int count,
  60                                 int node, pgprot_t prot);
  61 extern void vm_unmap_aliases(void);
  62
  63 #ifdef CONFIG_MMU
  64 extern void __init vmalloc_init(void);
  65 #else
  66 static inline void vmalloc_init(void)
  67 {
  68 }
  69 #endif
  70
  71 extern void *vmalloc(unsigned long size);
  72 extern void *vzalloc(unsigned long size);
  73 extern void *vmalloc_user(unsigned long size);
  74 extern void *vmalloc_node(unsigned long size, int node);
  75 extern void *vzalloc_node(unsigned long size, int node);
  76 extern void *vmalloc_exec(unsigned long size);
  77 extern void *vmalloc_32(unsigned long size);
  78 extern void *vmalloc_32_user(unsigned long size);
  79 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  80 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
  81                         unsigned long start, unsigned long end, gfp_t gfp_mask,
  82                         pgprot_t prot, unsigned long vm_flags, int node,
  83                         const void *caller);
  84 #ifndef CONFIG_MMU
  85 extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
  86 static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
  87                                                 gfp_t flags, void *caller)
  88 {
  89         return __vmalloc_node_flags(size, node, flags);
  90 }
  91 #else
  92 extern void *__vmalloc_node_flags_caller(unsigned long size,
  93                                          int node, gfp_t flags, void *caller);
  94 #endif
  95
  96 extern void vfree(const void *addr);
  97 extern void vfree_atomic(const void *addr);
  98
  99 extern void *vmap(struct page **pages, unsigned int count,
 100                         unsigned long flags, pgprot_t prot);
 101 extern void vunmap(const void *addr);
 102
 103 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
 104                                        unsigned long uaddr, void *kaddr,
 105                                        unsigned long size);
 106
 107 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 108                                                         unsigned long pgoff);
 109 void vmalloc_sync_all(void);
 110
 111 /*
 112  *      Lowlevel-APIs (not for driver use!)
 113  */
 114
 115 static inline size_t get_vm_area_size(const struct vm_struct *area)
 116 {
 117         if (!(area->flags & VM_NO_GUARD))
 118                 /* return actual size without guard page */
 119                 return area->size - PAGE_SIZE;
 120         else
 121                 return area->size;
 122
 123 }
 124
 125 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
 126 extern struct vm_struct *get_vm_area_caller(unsigned long size,
 127                                         unsigned long flags, const void *caller);
 128 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
 129                                         unsigned long start, unsigned long end);
 130 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
 131                                         unsigned long flags,
 132                                         unsigned long start, unsigned long end,
 133                                         const void *caller);
 134 extern struct vm_struct *remove_vm_area(const void *addr);
 135 extern struct vm_struct *find_vm_area(const void *addr);
 136
 137 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
 138                         struct page **pages);
 139 #ifdef CONFIG_MMU
 140 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
 141                                     pgprot_t prot, struct page **pages);
 142 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
 143 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 144 #else
 145 static inline int
 146 map_kernel_range_noflush(unsigned long start, unsigned long size,
 147                         pgprot_t prot, struct page **pages)
 148 {
 149         return size >> PAGE_SHIFT;
 150 }
 151 static inline void
 152 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
 153 {
 154 }
 155 static inline void
 156 unmap_kernel_range(unsigned long addr, unsigned long size)
 157 {
 158 }
 159 #endif
 160
 161 /* Allocate/destroy a 'vmalloc' VM area. */
 162 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
 163 extern void free_vm_area(struct vm_struct *area);
 164
 165 /* for /dev/kmem */
 166 extern long vread(char *buf, char *addr, unsigned long count);
 167 extern long vwrite(char *buf, char *addr, unsigned long count);
 168
 169 /*
 170  *      Internals.  Dont't use..
 171  */
 172 extern struct list_head vmap_area_list;
 173 extern __init void vm_area_add_early(struct vm_struct *vm);
 174 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
 175
 176 #ifdef CONFIG_SMP
 177 # ifdef CONFIG_MMU
 178 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 179                                      const size_t *sizes, int nr_vms,
 180                                      size_t align);
 181
 182 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
 183 # else
 184 static inline struct vm_struct **
 185 pcpu_get_vm_areas(const unsigned long *offsets,
 186                 const size_t *sizes, int nr_vms,
 187                 size_t align)
 188 {
 189         return NULL;
 190 }
 191
 192 static inline void
 193 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
 194 {
 195 }
 196 # endif
 197 #endif
 198
 199 #ifdef CONFIG_MMU
 200 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
 201 #else
 202 #define VMALLOC_TOTAL 0UL
 203 #endif
 204
 205 int register_vmap_purge_notifier(struct notifier_block *nb);
 206 int unregister_vmap_purge_notifier(struct notifier_block *nb);
 207
 208 #endif /* _LINUX_VMALLOC_H */