linux/include/linux/vmalloc.h
<<
>>
Prefs 
   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_UNINITIALIZED        0x00000020      /* vm_struct is not fully initialized */
  22#define VM_NO_GUARD             0x00000040      /* don't add guard page */
  23#define VM_KASAN                0x00000080      /* has allocated kasan shadow memory */
  24/*
  25 * Memory with VM_FLUSH_RESET_PERMS cannot be freed in an interrupt or with
  26 * vfree_atomic().
  27 */
  28#define VM_FLUSH_RESET_PERMS    0x00000100      /* Reset direct map and flush TLB on unmap */
  29/* bits [20..32] reserved for arch specific ioremap internals */
  30
  31/*
  32 * Maximum alignment for ioremap() regions.
  33 * Can be overriden by arch-specific value.
  34 */
  35#ifndef IOREMAP_MAX_ORDER
  36#define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  37#endif
  38
  39struct vm_struct {
  40        struct vm_struct        *next;
  41        void                    *addr;
  42        unsigned long           size;
  43        unsigned long           flags;
  44        struct page             **pages;
  45        unsigned int            nr_pages;
  46        phys_addr_t             phys_addr;
  47        const void              *caller;
  48};
  49
  50struct vmap_area {
  51        unsigned long va_start;
  52        unsigned long va_end;
  53
  54        /*
  55         * Largest available free size in subtree.
  56         */
  57        unsigned long subtree_max_size;
  58        unsigned long flags;
  59        struct rb_node rb_node;         /* address sorted rbtree */
  60        struct list_head list;          /* address sorted list */
  61        struct llist_node purge_list;    /* "lazy purge" list */
  62        struct vm_struct *vm;
  63};
  64
  65/*
  66 *      Highlevel APIs for driver use
  67 */
  68extern void vm_unmap_ram(const void *mem, unsigned int count);
  69extern void *vm_map_ram(struct page **pages, unsigned int count,
  70                                int node, pgprot_t prot);
  71extern void vm_unmap_aliases(void);
  72
  73#ifdef CONFIG_MMU
  74extern void __init vmalloc_init(void);
  75extern unsigned long vmalloc_nr_pages(void);
  76#else
  77static inline void vmalloc_init(void)
  78{
  79}
  80static inline unsigned long vmalloc_nr_pages(void) { return 0; }
  81#endif
  82
  83extern void *vmalloc(unsigned long size);
  84extern void *vzalloc(unsigned long size);
  85extern void *vmalloc_user(unsigned long size);
  86extern void *vmalloc_node(unsigned long size, int node);
  87extern void *vzalloc_node(unsigned long size, int node);
  88extern void *vmalloc_exec(unsigned long size);
  89extern void *vmalloc_32(unsigned long size);
  90extern void *vmalloc_32_user(unsigned long size);
  91extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  92extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
  93                        unsigned long start, unsigned long end, gfp_t gfp_mask,
  94                        pgprot_t prot, unsigned long vm_flags, int node,
  95                        const void *caller);
  96#ifndef CONFIG_MMU
  97extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
  98static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
  99                                                gfp_t flags, void *caller)
 100{
 101        return __vmalloc_node_flags(size, node, flags);
 102}
 103#else
 104extern void *__vmalloc_node_flags_caller(unsigned long size,
 105                                         int node, gfp_t flags, void *caller);
 106#endif
 107
 108extern void vfree(const void *addr);
 109extern void vfree_atomic(const void *addr);
 110
 111extern void *vmap(struct page **pages, unsigned int count,
 112                        unsigned long flags, pgprot_t prot);
 113extern void vunmap(const void *addr);
 114
 115extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
 116                                       unsigned long uaddr, void *kaddr,
 117                                       unsigned long size);
 118
 119extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 120                                                        unsigned long pgoff);
 121void vmalloc_sync_all(void);
 122 
 123/*
 124 *      Lowlevel-APIs (not for driver use!)
 125 */
 126
 127static inline size_t get_vm_area_size(const struct vm_struct *area)
 128{
 129        if (!(area->flags & VM_NO_GUARD))
 130                /* return actual size without guard page */
 131                return area->size - PAGE_SIZE;
 132        else
 133                return area->size;
 134
 135}
 136
 137extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
 138extern struct vm_struct *get_vm_area_caller(unsigned long size,
 139                                        unsigned long flags, const void *caller);
 140extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
 141                                        unsigned long start, unsigned long end);
 142extern struct vm_struct *__get_vm_area_caller(unsigned long size,
 143                                        unsigned long flags,
 144                                        unsigned long start, unsigned long end,
 145                                        const void *caller);
 146extern struct vm_struct *remove_vm_area(const void *addr);
 147extern struct vm_struct *find_vm_area(const void *addr);
 148
 149extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
 150                        struct page **pages);
 151#ifdef CONFIG_MMU
 152extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
 153                                    pgprot_t prot, struct page **pages);
 154extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
 155extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 156static inline void set_vm_flush_reset_perms(void *addr)
 157{
 158        struct vm_struct *vm = find_vm_area(addr);
 159
 160        if (vm)
 161                vm->flags |= VM_FLUSH_RESET_PERMS;
 162}
 163#else
 164static inline int
 165map_kernel_range_noflush(unsigned long start, unsigned long size,
 166                        pgprot_t prot, struct page **pages)
 167{
 168        return size >> PAGE_SHIFT;
 169}
 170static inline void
 171unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
 172{
 173}
 174static inline void
 175unmap_kernel_range(unsigned long addr, unsigned long size)
 176{
 177}
 178static inline void set_vm_flush_reset_perms(void *addr)
 179{
 180}
 181#endif
 182
 183/* Allocate/destroy a 'vmalloc' VM area. */
 184extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
 185extern void free_vm_area(struct vm_struct *area);
 186
 187/* for /dev/kmem */
 188extern long vread(char *buf, char *addr, unsigned long count);
 189extern long vwrite(char *buf, char *addr, unsigned long count);
 190
 191/*
 192 *      Internals.  Dont't use..
 193 */
 194extern struct list_head vmap_area_list;
 195extern __init void vm_area_add_early(struct vm_struct *vm);
 196extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
 197
 198#ifdef CONFIG_SMP
 199# ifdef CONFIG_MMU
 200struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 201                                     const size_t *sizes, int nr_vms,
 202                                     size_t align);
 203
 204void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
 205# else
 206static inline struct vm_struct **
 207pcpu_get_vm_areas(const unsigned long *offsets,
 208                const size_t *sizes, int nr_vms,
 209                size_t align)
 210{
 211        return NULL;
 212}
 213
 214static inline void
 215pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
 216{
 217}
 218# endif
 219#endif
 220
 221#ifdef CONFIG_MMU
 222#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
 223#else
 224#define VMALLOC_TOTAL 0UL
 225#endif
 226
 227int register_vmap_purge_notifier(struct notifier_block *nb);
 228int unregister_vmap_purge_notifier(struct notifier_block *nb);
 229
 230#endif /* _LINUX_VMALLOC_H */
 231
Hosted by Missing Link Electronics. The original LXR software by the LXR community, this experimental version by lxr@linux.no.