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 <asm/pgtable.h> /* PAGE_KERNEL */
10 #include <linux/rbtree.h>
12 struct vm_area_struct; /* vma defining user mapping in mm_types.h */
13 struct notifier_block; /* in notifier.h */
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 */
26 * Maximum alignment for ioremap() regions.
27 * Can be overriden by arch-specific value.
29 #ifndef IOREMAP_MAX_ORDER
30 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
34 struct vm_struct *next;
39 unsigned int nr_pages;
40 phys_addr_t phys_addr;
45 unsigned long va_start;
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 */
52 struct rcu_head rcu_head;
56 * Highlevel APIs for driver use
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);
64 extern void __init vmalloc_init(void);
66 static inline void vmalloc_init(void)
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,
85 extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
87 extern void *__vmalloc_node(unsigned long size, unsigned long align,
88 gfp_t gfp_mask, pgprot_t prot,
89 int node, const void *caller);
92 * We really want to have this inlined due to caller tracking. This
93 * function is used by the highlevel vmalloc apis and so we want to track
94 * their callers and inlining will achieve that.
96 static inline void *__vmalloc_node_flags(unsigned long size,
97 int node, gfp_t flags)
99 return __vmalloc_node(size, 1, flags, PAGE_KERNEL,
100 node, __builtin_return_address(0));
104 extern void vfree(const void *addr);
105 extern void vfree_atomic(const void *addr);
107 extern void *vmap(struct page **pages, unsigned int count,
108 unsigned long flags, pgprot_t prot);
109 extern void vunmap(const void *addr);
111 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
112 unsigned long uaddr, void *kaddr,
115 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
116 unsigned long pgoff);
117 void vmalloc_sync_all(void);
120 * Lowlevel-APIs (not for driver use!)
123 static inline size_t get_vm_area_size(const struct vm_struct *area)
125 if (!(area->flags & VM_NO_GUARD))
126 /* return actual size without guard page */
127 return area->size - PAGE_SIZE;
133 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
134 extern struct vm_struct *get_vm_area_caller(unsigned long size,
135 unsigned long flags, const void *caller);
136 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
137 unsigned long start, unsigned long end);
138 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
140 unsigned long start, unsigned long end,
142 extern struct vm_struct *remove_vm_area(const void *addr);
143 extern struct vm_struct *find_vm_area(const void *addr);
145 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
146 struct page **pages);
148 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
149 pgprot_t prot, struct page **pages);
150 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
151 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
154 map_kernel_range_noflush(unsigned long start, unsigned long size,
155 pgprot_t prot, struct page **pages)
157 return size >> PAGE_SHIFT;
160 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
164 unmap_kernel_range(unsigned long addr, unsigned long size)
169 /* Allocate/destroy a 'vmalloc' VM area. */
170 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
171 extern void free_vm_area(struct vm_struct *area);
174 extern long vread(char *buf, char *addr, unsigned long count);
175 extern long vwrite(char *buf, char *addr, unsigned long count);
178 * Internals. Dont't use..
180 extern struct list_head vmap_area_list;
181 extern __init void vm_area_add_early(struct vm_struct *vm);
182 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
186 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
187 const size_t *sizes, int nr_vms,
190 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
192 static inline struct vm_struct **
193 pcpu_get_vm_areas(const unsigned long *offsets,
194 const size_t *sizes, int nr_vms,
201 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
208 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
210 #define VMALLOC_TOTAL 0UL
213 int register_vmap_purge_notifier(struct notifier_block *nb);
214 int unregister_vmap_purge_notifier(struct notifier_block *nb);
216 #endif /* _LINUX_VMALLOC_H */