linux/include/linux/vmalloc.h
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   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#include <linux/overflow.h>
  12
  13struct vm_area_struct;          /* vma defining user mapping in mm_types.h */
  14struct notifier_block;          /* in notifier.h */
  15
  16/* bits in flags of vmalloc's vm_struct below */
  17#define VM_IOREMAP              0x00000001      /* ioremap() and friends */
  18#define VM_ALLOC                0x00000002      /* vmalloc() */
  19#define VM_MAP                  0x00000004      /* vmap()ed pages */
  20#define VM_USERMAP              0x00000008      /* suitable for remap_vmalloc_range */
  21#define VM_DMA_COHERENT         0x00000010      /* dma_alloc_coherent */
  22#define VM_UNINITIALIZED        0x00000020      /* vm_struct is not fully initialized */
  23#define VM_NO_GUARD             0x00000040      /* don't add guard page */
  24#define VM_KASAN                0x00000080      /* has allocated kasan shadow memory */
  25/*
  26 * Memory with VM_FLUSH_RESET_PERMS cannot be freed in an interrupt or with
  27 * vfree_atomic().
  28 */
  29#define VM_FLUSH_RESET_PERMS    0x00000100      /* Reset direct map and flush TLB on unmap */
  30
  31/* bits [20..32] reserved for arch specific ioremap internals */
  32
  33/*
  34 * Maximum alignment for ioremap() regions.
  35 * Can be overriden by arch-specific value.
  36 */
  37#ifndef IOREMAP_MAX_ORDER
  38#define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  39#endif
  40
  41struct vm_struct {
  42        struct vm_struct        *next;
  43        void                    *addr;
  44        unsigned long           size;
  45        unsigned long           flags;
  46        struct page             **pages;
  47        unsigned int            nr_pages;
  48        phys_addr_t             phys_addr;
  49        const void              *caller;
  50};
  51
  52struct vmap_area {
  53        unsigned long va_start;
  54        unsigned long va_end;
  55
  56        struct rb_node rb_node;         /* address sorted rbtree */
  57        struct list_head list;          /* address sorted list */
  58
  59        /*
  60         * The following three variables can be packed, because
  61         * a vmap_area object is always one of the three states:
  62         *    1) in "free" tree (root is vmap_area_root)
  63         *    2) in "busy" tree (root is free_vmap_area_root)
  64         *    3) in purge list  (head is vmap_purge_list)
  65         */
  66        union {
  67                unsigned long subtree_max_size; /* in "free" tree */
  68                struct vm_struct *vm;           /* in "busy" tree */
  69                struct llist_node purge_list;   /* in purge list */
  70        };
  71};
  72
  73/*
  74 *      Highlevel APIs for driver use
  75 */
  76extern void vm_unmap_ram(const void *mem, unsigned int count);
  77extern void *vm_map_ram(struct page **pages, unsigned int count,
  78                                int node, pgprot_t prot);
  79extern void vm_unmap_aliases(void);
  80
  81#ifdef CONFIG_MMU
  82extern void __init vmalloc_init(void);
  83extern unsigned long vmalloc_nr_pages(void);
  84#else
  85static inline void vmalloc_init(void)
  86{
  87}
  88static inline unsigned long vmalloc_nr_pages(void) { return 0; }
  89#endif
  90
  91extern void *vmalloc(unsigned long size);
  92extern void *vzalloc(unsigned long size);
  93extern void *vmalloc_user(unsigned long size);
  94extern void *vmalloc_node(unsigned long size, int node);
  95extern void *vzalloc_node(unsigned long size, int node);
  96extern void *vmalloc_exec(unsigned long size);
  97extern void *vmalloc_32(unsigned long size);
  98extern void *vmalloc_32_user(unsigned long size);
  99extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
 100extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 101                        unsigned long start, unsigned long end, gfp_t gfp_mask,
 102                        pgprot_t prot, unsigned long vm_flags, int node,
 103                        const void *caller);
 104#ifndef CONFIG_MMU
 105extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
 106static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
 107                                                gfp_t flags, void *caller)
 108{
 109        return __vmalloc_node_flags(size, node, flags);
 110}
 111#else
 112extern void *__vmalloc_node_flags_caller(unsigned long size,
 113                                         int node, gfp_t flags, void *caller);
 114#endif
 115
 116extern void vfree(const void *addr);
 117extern void vfree_atomic(const void *addr);
 118
 119extern void *vmap(struct page **pages, unsigned int count,
 120                        unsigned long flags, pgprot_t prot);
 121extern void vunmap(const void *addr);
 122
 123extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
 124                                       unsigned long uaddr, void *kaddr,
 125                                       unsigned long size);
 126
 127extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 128                                                        unsigned long pgoff);
 129void vmalloc_sync_all(void);
 130 
 131/*
 132 *      Lowlevel-APIs (not for driver use!)
 133 */
 134
 135static inline size_t get_vm_area_size(const struct vm_struct *area)
 136{
 137        if (!(area->flags & VM_NO_GUARD))
 138                /* return actual size without guard page */
 139                return area->size - PAGE_SIZE;
 140        else
 141                return area->size;
 142
 143}
 144
 145extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
 146extern struct vm_struct *get_vm_area_caller(unsigned long size,
 147                                        unsigned long flags, const void *caller);
 148extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
 149                                        unsigned long start, unsigned long end);
 150extern struct vm_struct *__get_vm_area_caller(unsigned long size,
 151                                        unsigned long flags,
 152                                        unsigned long start, unsigned long end,
 153                                        const void *caller);
 154extern struct vm_struct *remove_vm_area(const void *addr);
 155extern struct vm_struct *find_vm_area(const void *addr);
 156
 157extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
 158                        struct page **pages);
 159#ifdef CONFIG_MMU
 160extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
 161                                    pgprot_t prot, struct page **pages);
 162extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
 163extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 164static inline void set_vm_flush_reset_perms(void *addr)
 165{
 166        struct vm_struct *vm = find_vm_area(addr);
 167
 168        if (vm)
 169                vm->flags |= VM_FLUSH_RESET_PERMS;
 170}
 171#else
 172static inline int
 173map_kernel_range_noflush(unsigned long start, unsigned long size,
 174                        pgprot_t prot, struct page **pages)
 175{
 176        return size >> PAGE_SHIFT;
 177}
 178static inline void
 179unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
 180{
 181}
 182static inline void
 183unmap_kernel_range(unsigned long addr, unsigned long size)
 184{
 185}
 186static inline void set_vm_flush_reset_perms(void *addr)
 187{
 188}
 189#endif
 190
 191/* Allocate/destroy a 'vmalloc' VM area. */
 192extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
 193extern void free_vm_area(struct vm_struct *area);
 194
 195/* for /dev/kmem */
 196extern long vread(char *buf, char *addr, unsigned long count);
 197extern long vwrite(char *buf, char *addr, unsigned long count);
 198
 199/*
 200 *      Internals.  Dont't use..
 201 */
 202extern struct list_head vmap_area_list;
 203extern __init void vm_area_add_early(struct vm_struct *vm);
 204extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
 205
 206#ifdef CONFIG_SMP
 207# ifdef CONFIG_MMU
 208struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 209                                     const size_t *sizes, int nr_vms,
 210                                     size_t align);
 211
 212void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
 213# else
 214static inline struct vm_struct **
 215pcpu_get_vm_areas(const unsigned long *offsets,
 216                const size_t *sizes, int nr_vms,
 217                size_t align)
 218{
 219        return NULL;
 220}
 221
 222static inline void
 223pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
 224{
 225}
 226# endif
 227#endif
 228
 229#ifdef CONFIG_MMU
 230#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
 231#else
 232#define VMALLOC_TOTAL 0UL
 233#endif
 234
 235int register_vmap_purge_notifier(struct notifier_block *nb);
 236int unregister_vmap_purge_notifier(struct notifier_block *nb);
 237
 238#endif /* _LINUX_VMALLOC_H */
 239
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