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Linux/include/linux/vmalloc.h

  1 #ifndef _LINUX_VMALLOC_H
  2 #define _LINUX_VMALLOC_H
  3 
  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>
 10 
 11 struct vm_area_struct;          /* vma defining user mapping in mm_types.h */
 12 struct notifier_block;          /* in notifier.h */
 13 
 14 /* bits in flags of vmalloc's vm_struct below */
 15 #define VM_IOREMAP              0x00000001      /* ioremap() and friends */
 16 #define VM_ALLOC                0x00000002      /* vmalloc() */
 17 #define VM_MAP                  0x00000004      /* vmap()ed pages */
 18 #define VM_USERMAP              0x00000008      /* suitable for remap_vmalloc_range */
 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 /* bits [20..32] reserved for arch specific ioremap internals */
 23 
 24 /*
 25  * Maximum alignment for ioremap() regions.
 26  * Can be overriden by arch-specific value.
 27  */
 28 #ifndef IOREMAP_MAX_ORDER
 29 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
 30 #endif
 31 
 32 struct vm_struct {
 33         struct vm_struct        *next;
 34         void                    *addr;
 35         unsigned long           size;
 36         unsigned long           flags;
 37         struct page             **pages;
 38         unsigned int            nr_pages;
 39         phys_addr_t             phys_addr;
 40         const void              *caller;
 41 };
 42 
 43 struct vmap_area {
 44         unsigned long va_start;
 45         unsigned long va_end;
 46         unsigned long flags;
 47         struct rb_node rb_node;         /* address sorted rbtree */
 48         struct list_head list;          /* address sorted list */
 49         struct llist_node purge_list;    /* "lazy purge" list */
 50         struct vm_struct *vm;
 51         struct rcu_head rcu_head;
 52 };
 53 
 54 /*
 55  *      Highlevel APIs for driver use
 56  */
 57 extern void vm_unmap_ram(const void *mem, unsigned int count);
 58 extern void *vm_map_ram(struct page **pages, unsigned int count,
 59                                 int node, pgprot_t prot);
 60 extern void vm_unmap_aliases(void);
 61 
 62 #ifdef CONFIG_MMU
 63 extern void __init vmalloc_init(void);
 64 #else
 65 static inline void vmalloc_init(void)
 66 {
 67 }
 68 #endif
 69 
 70 extern void *vmalloc(unsigned long size);
 71 extern void *vzalloc(unsigned long size);
 72 extern void *vmalloc_user(unsigned long size);
 73 extern void *vmalloc_node(unsigned long size, int node);
 74 extern void *vzalloc_node(unsigned long size, int node);
 75 extern void *vmalloc_exec(unsigned long size);
 76 extern void *vmalloc_32(unsigned long size);
 77 extern void *vmalloc_32_user(unsigned long size);
 78 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
 79 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 80                         unsigned long start, unsigned long end, gfp_t gfp_mask,
 81                         pgprot_t prot, unsigned long vm_flags, int node,
 82                         const void *caller);
 83 
 84 extern void vfree(const void *addr);
 85 
 86 extern void *vmap(struct page **pages, unsigned int count,
 87                         unsigned long flags, pgprot_t prot);
 88 extern void vunmap(const void *addr);
 89 
 90 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
 91                                        unsigned long uaddr, void *kaddr,
 92                                        unsigned long size);
 93 
 94 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 95                                                         unsigned long pgoff);
 96 void vmalloc_sync_all(void);
 97  
 98 /*
 99  *      Lowlevel-APIs (not for driver use!)
100  */
101 
102 static inline size_t get_vm_area_size(const struct vm_struct *area)
103 {
104         if (!(area->flags & VM_NO_GUARD))
105                 /* return actual size without guard page */
106                 return area->size - PAGE_SIZE;
107         else
108                 return area->size;
109 
110 }
111 
112 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
113 extern struct vm_struct *get_vm_area_caller(unsigned long size,
114                                         unsigned long flags, const void *caller);
115 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
116                                         unsigned long start, unsigned long end);
117 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
118                                         unsigned long flags,
119                                         unsigned long start, unsigned long end,
120                                         const void *caller);
121 extern struct vm_struct *remove_vm_area(const void *addr);
122 extern struct vm_struct *find_vm_area(const void *addr);
123 
124 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
125                         struct page **pages);
126 #ifdef CONFIG_MMU
127 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
128                                     pgprot_t prot, struct page **pages);
129 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
130 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
131 #else
132 static inline int
133 map_kernel_range_noflush(unsigned long start, unsigned long size,
134                         pgprot_t prot, struct page **pages)
135 {
136         return size >> PAGE_SHIFT;
137 }
138 static inline void
139 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
140 {
141 }
142 static inline void
143 unmap_kernel_range(unsigned long addr, unsigned long size)
144 {
145 }
146 #endif
147 
148 /* Allocate/destroy a 'vmalloc' VM area. */
149 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
150 extern void free_vm_area(struct vm_struct *area);
151 
152 /* for /dev/kmem */
153 extern long vread(char *buf, char *addr, unsigned long count);
154 extern long vwrite(char *buf, char *addr, unsigned long count);
155 
156 /*
157  *      Internals.  Dont't use..
158  */
159 extern struct list_head vmap_area_list;
160 extern __init void vm_area_add_early(struct vm_struct *vm);
161 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
162 
163 #ifdef CONFIG_SMP
164 # ifdef CONFIG_MMU
165 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
166                                      const size_t *sizes, int nr_vms,
167                                      size_t align);
168 
169 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
170 # else
171 static inline struct vm_struct **
172 pcpu_get_vm_areas(const unsigned long *offsets,
173                 const size_t *sizes, int nr_vms,
174                 size_t align)
175 {
176         return NULL;
177 }
178 
179 static inline void
180 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
181 {
182 }
183 # endif
184 #endif
185 
186 #ifdef CONFIG_MMU
187 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
188 #else
189 #define VMALLOC_TOTAL 0UL
190 #endif
191 
192 int register_vmap_purge_notifier(struct notifier_block *nb);
193 int unregister_vmap_purge_notifier(struct notifier_block *nb);
194 
195 #endif /* _LINUX_VMALLOC_H */
196 

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