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TOMOYO Linux Cross Reference
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 
 12 struct vm_area_struct;          /* vma defining user mapping in mm_types.h */
 13 struct notifier_block;          /* in notifier.h */
 14 
 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 */
 24 
 25 /*
 26  * Maximum alignment for ioremap() regions.
 27  * Can be overriden by arch-specific value.
 28  */
 29 #ifndef IOREMAP_MAX_ORDER
 30 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
 31 #endif
 32 
 33 struct vm_struct {
 34         struct vm_struct        *next;
 35         void                    *addr;
 36         unsigned long           size;
 37         unsigned long           flags;
 38         struct page             **pages;
 39         unsigned int            nr_pages;
 40         phys_addr_t             phys_addr;
 41         const void              *caller;
 42 };
 43 
 44 struct vmap_area {
 45         unsigned long va_start;
 46         unsigned long va_end;
 47         unsigned long flags;
 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 */
 51         struct vm_struct *vm;
 52         struct rcu_head rcu_head;
 53 };
 54 
 55 /*
 56  *      Highlevel APIs for driver use
 57  */
 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);
 62 
 63 #ifdef CONFIG_MMU
 64 extern void __init vmalloc_init(void);
 65 #else
 66 static inline void vmalloc_init(void)
 67 {
 68 }
 69 #endif
 70 
 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,
 83                         const void *caller);
 84 #ifndef CONFIG_MMU
 85 extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags);
 86 static inline void *__vmalloc_node_flags_caller(unsigned long size, int node,
 87                                                 gfp_t flags, void *caller)
 88 {
 89         return __vmalloc_node_flags(size, node, flags);
 90 }
 91 #else
 92 extern void *__vmalloc_node_flags_caller(unsigned long size,
 93                                          int node, gfp_t flags, void *caller);
 94 #endif
 95 
 96 extern void vfree(const void *addr);
 97 extern void vfree_atomic(const void *addr);
 98 
 99 extern void *vmap(struct page **pages, unsigned int count,
100                         unsigned long flags, pgprot_t prot);
101 extern void vunmap(const void *addr);
102 
103 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
104                                        unsigned long uaddr, void *kaddr,
105                                        unsigned long size);
106 
107 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
108                                                         unsigned long pgoff);
109 void vmalloc_sync_all(void);
110  
111 /*
112  *      Lowlevel-APIs (not for driver use!)
113  */
114 
115 static inline size_t get_vm_area_size(const struct vm_struct *area)
116 {
117         if (!(area->flags & VM_NO_GUARD))
118                 /* return actual size without guard page */
119                 return area->size - PAGE_SIZE;
120         else
121                 return area->size;
122 
123 }
124 
125 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
126 extern struct vm_struct *get_vm_area_caller(unsigned long size,
127                                         unsigned long flags, const void *caller);
128 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
129                                         unsigned long start, unsigned long end);
130 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
131                                         unsigned long flags,
132                                         unsigned long start, unsigned long end,
133                                         const void *caller);
134 extern struct vm_struct *remove_vm_area(const void *addr);
135 extern struct vm_struct *find_vm_area(const void *addr);
136 
137 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
138                         struct page **pages);
139 #ifdef CONFIG_MMU
140 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
141                                     pgprot_t prot, struct page **pages);
142 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
143 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
144 #else
145 static inline int
146 map_kernel_range_noflush(unsigned long start, unsigned long size,
147                         pgprot_t prot, struct page **pages)
148 {
149         return size >> PAGE_SHIFT;
150 }
151 static inline void
152 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
153 {
154 }
155 static inline void
156 unmap_kernel_range(unsigned long addr, unsigned long size)
157 {
158 }
159 #endif
160 
161 /* Allocate/destroy a 'vmalloc' VM area. */
162 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
163 extern void free_vm_area(struct vm_struct *area);
164 
165 /* for /dev/kmem */
166 extern long vread(char *buf, char *addr, unsigned long count);
167 extern long vwrite(char *buf, char *addr, unsigned long count);
168 
169 /*
170  *      Internals.  Dont't use..
171  */
172 extern struct list_head vmap_area_list;
173 extern __init void vm_area_add_early(struct vm_struct *vm);
174 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
175 
176 #ifdef CONFIG_SMP
177 # ifdef CONFIG_MMU
178 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
179                                      const size_t *sizes, int nr_vms,
180                                      size_t align);
181 
182 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
183 # else
184 static inline struct vm_struct **
185 pcpu_get_vm_areas(const unsigned long *offsets,
186                 const size_t *sizes, int nr_vms,
187                 size_t align)
188 {
189         return NULL;
190 }
191 
192 static inline void
193 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
194 {
195 }
196 # endif
197 #endif
198 
199 #ifdef CONFIG_MMU
200 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
201 #else
202 #define VMALLOC_TOTAL 0UL
203 #endif
204 
205 int register_vmap_purge_notifier(struct notifier_block *nb);
206 int unregister_vmap_purge_notifier(struct notifier_block *nb);
207 
208 #endif /* _LINUX_VMALLOC_H */
209 

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