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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 <asm/page.h>           /* pgprot_t */
  8 #include <linux/rbtree.h>
  9 
 10 struct vm_area_struct;          /* vma defining user mapping in mm_types.h */
 11 
 12 /* bits in flags of vmalloc's vm_struct below */
 13 #define VM_IOREMAP              0x00000001      /* ioremap() and friends */
 14 #define VM_ALLOC                0x00000002      /* vmalloc() */
 15 #define VM_MAP                  0x00000004      /* vmap()ed pages */
 16 #define VM_USERMAP              0x00000008      /* suitable for remap_vmalloc_range */
 17 #define VM_UNINITIALIZED        0x00000020      /* vm_struct is not fully initialized */
 18 #define VM_NO_GUARD             0x00000040      /* don't add guard page */
 19 #define VM_KASAN                0x00000080      /* has allocated kasan shadow memory */
 20 /* bits [20..32] reserved for arch specific ioremap internals */
 21 
 22 /*
 23  * Maximum alignment for ioremap() regions.
 24  * Can be overriden by arch-specific value.
 25  */
 26 #ifndef IOREMAP_MAX_ORDER
 27 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
 28 #endif
 29 
 30 struct vm_struct {
 31         struct vm_struct        *next;
 32         void                    *addr;
 33         unsigned long           size;
 34         unsigned long           flags;
 35         struct page             **pages;
 36         unsigned int            nr_pages;
 37         phys_addr_t             phys_addr;
 38         const void              *caller;
 39 };
 40 
 41 struct vmap_area {
 42         unsigned long va_start;
 43         unsigned long va_end;
 44         unsigned long flags;
 45         struct rb_node rb_node;         /* address sorted rbtree */
 46         struct list_head list;          /* address sorted list */
 47         struct list_head purge_list;    /* "lazy purge" list */
 48         struct vm_struct *vm;
 49         struct rcu_head rcu_head;
 50 };
 51 
 52 /*
 53  *      Highlevel APIs for driver use
 54  */
 55 extern void vm_unmap_ram(const void *mem, unsigned int count);
 56 extern void *vm_map_ram(struct page **pages, unsigned int count,
 57                                 int node, pgprot_t prot);
 58 extern void vm_unmap_aliases(void);
 59 
 60 #ifdef CONFIG_MMU
 61 extern void __init vmalloc_init(void);
 62 #else
 63 static inline void vmalloc_init(void)
 64 {
 65 }
 66 #endif
 67 
 68 extern void *vmalloc(unsigned long size);
 69 extern void *vzalloc(unsigned long size);
 70 extern void *vmalloc_user(unsigned long size);
 71 extern void *vmalloc_node(unsigned long size, int node);
 72 extern void *vzalloc_node(unsigned long size, int node);
 73 extern void *vmalloc_exec(unsigned long size);
 74 extern void *vmalloc_32(unsigned long size);
 75 extern void *vmalloc_32_user(unsigned long size);
 76 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
 77 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 78                         unsigned long start, unsigned long end, gfp_t gfp_mask,
 79                         pgprot_t prot, unsigned long vm_flags, int node,
 80                         const void *caller);
 81 
 82 extern void vfree(const void *addr);
 83 
 84 extern void *vmap(struct page **pages, unsigned int count,
 85                         unsigned long flags, pgprot_t prot);
 86 extern void vunmap(const void *addr);
 87 
 88 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
 89                                        unsigned long uaddr, void *kaddr,
 90                                        unsigned long size);
 91 
 92 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 93                                                         unsigned long pgoff);
 94 void vmalloc_sync_all(void);
 95  
 96 /*
 97  *      Lowlevel-APIs (not for driver use!)
 98  */
 99 
100 static inline size_t get_vm_area_size(const struct vm_struct *area)
101 {
102         if (!(area->flags & VM_NO_GUARD))
103                 /* return actual size without guard page */
104                 return area->size - PAGE_SIZE;
105         else
106                 return area->size;
107 
108 }
109 
110 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
111 extern struct vm_struct *get_vm_area_caller(unsigned long size,
112                                         unsigned long flags, const void *caller);
113 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
114                                         unsigned long start, unsigned long end);
115 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
116                                         unsigned long flags,
117                                         unsigned long start, unsigned long end,
118                                         const void *caller);
119 extern struct vm_struct *remove_vm_area(const void *addr);
120 extern struct vm_struct *find_vm_area(const void *addr);
121 
122 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
123                         struct page **pages);
124 #ifdef CONFIG_MMU
125 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
126                                     pgprot_t prot, struct page **pages);
127 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
128 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
129 #else
130 static inline int
131 map_kernel_range_noflush(unsigned long start, unsigned long size,
132                         pgprot_t prot, struct page **pages)
133 {
134         return size >> PAGE_SHIFT;
135 }
136 static inline void
137 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
138 {
139 }
140 static inline void
141 unmap_kernel_range(unsigned long addr, unsigned long size)
142 {
143 }
144 #endif
145 
146 /* Allocate/destroy a 'vmalloc' VM area. */
147 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
148 extern void free_vm_area(struct vm_struct *area);
149 
150 /* for /dev/kmem */
151 extern long vread(char *buf, char *addr, unsigned long count);
152 extern long vwrite(char *buf, char *addr, unsigned long count);
153 
154 /*
155  *      Internals.  Dont't use..
156  */
157 extern struct list_head vmap_area_list;
158 extern __init void vm_area_add_early(struct vm_struct *vm);
159 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
160 
161 #ifdef CONFIG_SMP
162 # ifdef CONFIG_MMU
163 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
164                                      const size_t *sizes, int nr_vms,
165                                      size_t align);
166 
167 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
168 # else
169 static inline struct vm_struct **
170 pcpu_get_vm_areas(const unsigned long *offsets,
171                 const size_t *sizes, int nr_vms,
172                 size_t align)
173 {
174         return NULL;
175 }
176 
177 static inline void
178 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
179 {
180 }
181 # endif
182 #endif
183 
184 #ifdef CONFIG_MMU
185 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
186 #else
187 #define VMALLOC_TOTAL 0UL
188 #endif
189 
190 #endif /* _LINUX_VMALLOC_H */
191 

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