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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 extern void vfree_atomic(const void *addr);
 86 
 87 extern void *vmap(struct page **pages, unsigned int count,
 88                         unsigned long flags, pgprot_t prot);
 89 extern void vunmap(const void *addr);
 90 
 91 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
 92                                        unsigned long uaddr, void *kaddr,
 93                                        unsigned long size);
 94 
 95 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 96                                                         unsigned long pgoff);
 97 void vmalloc_sync_all(void);
 98  
 99 /*
100  *      Lowlevel-APIs (not for driver use!)
101  */
102 
103 static inline size_t get_vm_area_size(const struct vm_struct *area)
104 {
105         if (!(area->flags & VM_NO_GUARD))
106                 /* return actual size without guard page */
107                 return area->size - PAGE_SIZE;
108         else
109                 return area->size;
110 
111 }
112 
113 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
114 extern struct vm_struct *get_vm_area_caller(unsigned long size,
115                                         unsigned long flags, const void *caller);
116 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
117                                         unsigned long start, unsigned long end);
118 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
119                                         unsigned long flags,
120                                         unsigned long start, unsigned long end,
121                                         const void *caller);
122 extern struct vm_struct *remove_vm_area(const void *addr);
123 extern struct vm_struct *find_vm_area(const void *addr);
124 
125 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
126                         struct page **pages);
127 #ifdef CONFIG_MMU
128 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
129                                     pgprot_t prot, struct page **pages);
130 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
131 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
132 #else
133 static inline int
134 map_kernel_range_noflush(unsigned long start, unsigned long size,
135                         pgprot_t prot, struct page **pages)
136 {
137         return size >> PAGE_SHIFT;
138 }
139 static inline void
140 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
141 {
142 }
143 static inline void
144 unmap_kernel_range(unsigned long addr, unsigned long size)
145 {
146 }
147 #endif
148 
149 /* Allocate/destroy a 'vmalloc' VM area. */
150 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
151 extern void free_vm_area(struct vm_struct *area);
152 
153 /* for /dev/kmem */
154 extern long vread(char *buf, char *addr, unsigned long count);
155 extern long vwrite(char *buf, char *addr, unsigned long count);
156 
157 /*
158  *      Internals.  Dont't use..
159  */
160 extern struct list_head vmap_area_list;
161 extern __init void vm_area_add_early(struct vm_struct *vm);
162 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
163 
164 #ifdef CONFIG_SMP
165 # ifdef CONFIG_MMU
166 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
167                                      const size_t *sizes, int nr_vms,
168                                      size_t align);
169 
170 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
171 # else
172 static inline struct vm_struct **
173 pcpu_get_vm_areas(const unsigned long *offsets,
174                 const size_t *sizes, int nr_vms,
175                 size_t align)
176 {
177         return NULL;
178 }
179 
180 static inline void
181 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
182 {
183 }
184 # endif
185 #endif
186 
187 #ifdef CONFIG_MMU
188 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
189 #else
190 #define VMALLOC_TOTAL 0UL
191 #endif
192 
193 int register_vmap_purge_notifier(struct notifier_block *nb);
194 int unregister_vmap_purge_notifier(struct notifier_block *nb);
195 
196 #endif /* _LINUX_VMALLOC_H */
197 

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