1 #ifndef _LINUX_VMALLOC_H
2 #define _LINUX_VMALLOC_H
4 #include <linux/spinlock.h>
5 #include <linux/init.h>
6 #include <linux/list.h>
7 #include <linux/llist.h>
8 #include <asm/page.h> /* pgprot_t */
9 #include <linux/rbtree.h>
11 struct vm_area_struct; /* vma defining user mapping in mm_types.h */
13 /* bits in flags of vmalloc's vm_struct below */
14 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */
15 #define VM_ALLOC 0x00000002 /* vmalloc() */
16 #define VM_MAP 0x00000004 /* vmap()ed pages */
17 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
18 #define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
19 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
20 #define VM_NO_GUARD 0x00000040 /* don't add guard page */
21 #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
22 #define VM_LOWMEM 0x00000100 /* Tracking of direct mapped lowmem */
24 /* bits [20..32] reserved for arch specific ioremap internals */
27 * Maximum alignment for ioremap() regions.
28 * Can be overriden by arch-specific value.
30 #ifndef IOREMAP_MAX_ORDER
31 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
35 struct vm_struct *next;
40 unsigned int nr_pages;
41 phys_addr_t phys_addr;
46 unsigned long va_start;
49 struct rb_node rb_node; /* address sorted rbtree */
50 struct list_head list; /* address sorted list */
51 struct llist_node purge_list; /* "lazy purge" list */
53 struct rcu_head rcu_head;
57 * Highlevel APIs for driver use
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);
65 extern void __init vmalloc_init(void);
67 static inline void vmalloc_init(void)
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, unsigned long vm_flags, int node,
86 extern void vfree(const void *addr);
87 extern void vfree_atomic(const void *addr);
89 extern void *vmap(struct page **pages, unsigned int count,
90 unsigned long flags, pgprot_t prot);
91 extern void vunmap(const void *addr);
93 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
94 unsigned long uaddr, void *kaddr,
97 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
99 void vmalloc_sync_all(void);
102 * Lowlevel-APIs (not for driver use!)
105 static inline size_t get_vm_area_size(const struct vm_struct *area)
107 if (!(area->flags & VM_NO_GUARD))
108 /* return actual size without guard page */
109 return area->size - PAGE_SIZE;
115 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
116 extern struct vm_struct *get_vm_area_caller(unsigned long size,
117 unsigned long flags, const void *caller);
118 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
119 unsigned long start, unsigned long end);
120 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
122 unsigned long start, unsigned long end,
124 extern struct vm_struct *remove_vm_area(const void *addr);
125 extern struct vm_struct *find_vm_area(const void *addr);
127 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
128 struct page **pages);
130 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
131 pgprot_t prot, struct page **pages);
132 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
133 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
136 map_kernel_range_noflush(unsigned long start, unsigned long size,
137 pgprot_t prot, struct page **pages)
139 return size >> PAGE_SHIFT;
142 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
146 unmap_kernel_range(unsigned long addr, unsigned long size)
151 /* Allocate/destroy a 'vmalloc' VM area. */
152 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
153 extern void free_vm_area(struct vm_struct *area);
156 extern long vread(char *buf, char *addr, unsigned long count);
157 extern long vwrite(char *buf, char *addr, unsigned long count);
160 * Internals. Dont't use..
162 extern struct list_head vmap_area_list;
163 extern __init void vm_area_add_early(struct vm_struct *vm);
164 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
165 extern __init int vm_area_check_early(struct vm_struct *vm);
166 #ifdef CONFIG_ENABLE_VMALLOC_SAVING
167 extern void mark_vmalloc_reserved_area(void *addr, unsigned long size);
169 static inline void mark_vmalloc_reserved_area(void *addr, unsigned long size)
175 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
176 const size_t *sizes, int nr_vms,
179 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
181 static inline struct vm_struct **
182 pcpu_get_vm_areas(const unsigned long *offsets,
183 const size_t *sizes, int nr_vms,
190 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
197 #ifdef CONFIG_ENABLE_VMALLOC_SAVING
198 extern unsigned long total_vmalloc_size;
199 #define VMALLOC_TOTAL total_vmalloc_size
201 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
204 #define VMALLOC_TOTAL 0UL
207 #endif /* _LINUX_VMALLOC_H */