1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_VMALLOC_H
3 #define _LINUX_VMALLOC_H
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>
13 struct vm_area_struct; /* vma defining user mapping in mm_types.h */
14 struct notifier_block; /* in notifier.h */
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 */
26 * Memory with VM_FLUSH_RESET_PERMS cannot be freed in an interrupt or with
29 #define VM_FLUSH_RESET_PERMS 0x00000100 /* Reset direct map and flush TLB on unmap */
31 /* bits [20..32] reserved for arch specific ioremap internals */
34 * Maximum alignment for ioremap() regions.
35 * Can be overriden by arch-specific value.
37 #ifndef IOREMAP_MAX_ORDER
38 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
42 struct vm_struct *next;
47 unsigned int nr_pages;
48 phys_addr_t phys_addr;
53 unsigned long va_start;
57 * Largest available free size in subtree.
59 unsigned long subtree_max_size;
61 struct rb_node rb_node; /* address sorted rbtree */
62 struct list_head list; /* address sorted list */
63 struct llist_node purge_list; /* "lazy purge" list */
68 * Highlevel APIs for driver use
70 extern void vm_unmap_ram(const void *mem, unsigned int count);
71 extern void *vm_map_ram(struct page **pages, unsigned int count,
72 int node, pgprot_t prot);
73 extern void vm_unmap_aliases(void);
76 extern void __init vmalloc_init(void);
77 extern unsigned long vmalloc_nr_pages(void);
79 static inline void vmalloc_init(void)
82 static inline unsigned long vmalloc_nr_pages(void) { return 0; }
85 extern void *vmalloc(unsigned long size);
86 extern void *vzalloc(unsigned long size);
87 extern void *vmalloc_user(unsigned long size);
88 extern void *vmalloc_node(unsigned long size, int node);
89 extern void *vzalloc_node(unsigned long size, int node);
90 extern void *vmalloc_exec(unsigned long size);
91 extern void *vmalloc_32(unsigned long size);
92 extern void *vmalloc_32_user(unsigned long size);
93 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
94 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
95 unsigned long start, unsigned long end, gfp_t gfp_mask,
96 pgprot_t prot, unsigned long vm_flags, int node,
99 extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
100 static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
101 gfp_t flags, void *caller)
103 return __vmalloc_node_flags(size, node, flags);
106 extern void *__vmalloc_node_flags_caller(unsigned long size,
107 int node, gfp_t flags, void *caller);
110 extern void vfree(const void *addr);
111 extern void vfree_atomic(const void *addr);
113 extern void *vmap(struct page **pages, unsigned int count,
114 unsigned long flags, pgprot_t prot);
115 extern void vunmap(const void *addr);
117 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
118 unsigned long uaddr, void *kaddr,
121 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
122 unsigned long pgoff);
123 void vmalloc_sync_all(void);
126 * Lowlevel-APIs (not for driver use!)
129 static inline size_t get_vm_area_size(const struct vm_struct *area)
131 if (!(area->flags & VM_NO_GUARD))
132 /* return actual size without guard page */
133 return area->size - PAGE_SIZE;
139 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
140 extern struct vm_struct *get_vm_area_caller(unsigned long size,
141 unsigned long flags, const void *caller);
142 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
143 unsigned long start, unsigned long end);
144 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
146 unsigned long start, unsigned long end,
148 extern struct vm_struct *remove_vm_area(const void *addr);
149 extern struct vm_struct *find_vm_area(const void *addr);
151 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
152 struct page **pages);
154 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
155 pgprot_t prot, struct page **pages);
156 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
157 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
158 static inline void set_vm_flush_reset_perms(void *addr)
160 struct vm_struct *vm = find_vm_area(addr);
163 vm->flags |= VM_FLUSH_RESET_PERMS;
167 map_kernel_range_noflush(unsigned long start, unsigned long size,
168 pgprot_t prot, struct page **pages)
170 return size >> PAGE_SHIFT;
173 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
177 unmap_kernel_range(unsigned long addr, unsigned long size)
180 static inline void set_vm_flush_reset_perms(void *addr)
185 /* Allocate/destroy a 'vmalloc' VM area. */
186 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
187 extern void free_vm_area(struct vm_struct *area);
190 extern long vread(char *buf, char *addr, unsigned long count);
191 extern long vwrite(char *buf, char *addr, unsigned long count);
194 * Internals. Dont't use..
196 extern struct list_head vmap_area_list;
197 extern __init void vm_area_add_early(struct vm_struct *vm);
198 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
202 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
203 const size_t *sizes, int nr_vms,
206 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
208 static inline struct vm_struct **
209 pcpu_get_vm_areas(const unsigned long *offsets,
210 const size_t *sizes, int nr_vms,
217 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
224 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
226 #define VMALLOC_TOTAL 0UL
229 int register_vmap_purge_notifier(struct notifier_block *nb);
230 int unregister_vmap_purge_notifier(struct notifier_block *nb);
232 #endif /* _LINUX_VMALLOC_H */