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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_VPAGES               0x00000010      /* buffer for pages was vmalloc'ed */
 18 #define VM_UNINITIALIZED        0x00000020      /* vm_struct is not fully initialized */
 19 /* bits [20..32] reserved for arch specific ioremap internals */
 20 
 21 /*
 22  * Maximum alignment for ioremap() regions.
 23  * Can be overriden by arch-specific value.
 24  */
 25 #ifndef IOREMAP_MAX_ORDER
 26 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
 27 #endif
 28 
 29 struct vm_struct {
 30         struct vm_struct        *next;
 31         void                    *addr;
 32         unsigned long           size;
 33         unsigned long           flags;
 34         struct page             **pages;
 35         unsigned int            nr_pages;
 36         phys_addr_t             phys_addr;
 37         const void              *caller;
 38 };
 39 
 40 struct vmap_area {
 41         unsigned long va_start;
 42         unsigned long va_end;
 43         unsigned long flags;
 44         struct rb_node rb_node;         /* address sorted rbtree */
 45         struct list_head list;          /* address sorted list */
 46         struct list_head purge_list;    /* "lazy purge" list */
 47         struct vm_struct *vm;
 48         struct rcu_head rcu_head;
 49 };
 50 
 51 /*
 52  *      Highlevel APIs for driver use
 53  */
 54 extern void vm_unmap_ram(const void *mem, unsigned int count);
 55 extern void *vm_map_ram(struct page **pages, unsigned int count,
 56                                 int node, pgprot_t prot);
 57 extern void vm_unmap_aliases(void);
 58 
 59 #ifdef CONFIG_MMU
 60 extern void __init vmalloc_init(void);
 61 #else
 62 static inline void vmalloc_init(void)
 63 {
 64 }
 65 #endif
 66 
 67 extern void *vmalloc(unsigned long size);
 68 extern void *vzalloc(unsigned long size);
 69 extern void *vmalloc_user(unsigned long size);
 70 extern void *vmalloc_node(unsigned long size, int node);
 71 extern void *vzalloc_node(unsigned long size, int node);
 72 extern void *vmalloc_exec(unsigned long size);
 73 extern void *vmalloc_32(unsigned long size);
 74 extern void *vmalloc_32_user(unsigned long size);
 75 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
 76 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 77                         unsigned long start, unsigned long end, gfp_t gfp_mask,
 78                         pgprot_t prot, int node, const void *caller);
 79 extern void vfree(const void *addr);
 80 
 81 extern void *vmap(struct page **pages, unsigned int count,
 82                         unsigned long flags, pgprot_t prot);
 83 extern void vunmap(const void *addr);
 84 
 85 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
 86                                        unsigned long uaddr, void *kaddr,
 87                                        unsigned long size);
 88 
 89 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 90                                                         unsigned long pgoff);
 91 void vmalloc_sync_all(void);
 92  
 93 /*
 94  *      Lowlevel-APIs (not for driver use!)
 95  */
 96 
 97 static inline size_t get_vm_area_size(const struct vm_struct *area)
 98 {
 99         /* return actual size without guard page */
100         return area->size - PAGE_SIZE;
101 }
102 
103 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
104 extern struct vm_struct *get_vm_area_caller(unsigned long size,
105                                         unsigned long flags, const void *caller);
106 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
107                                         unsigned long start, unsigned long end);
108 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
109                                         unsigned long flags,
110                                         unsigned long start, unsigned long end,
111                                         const void *caller);
112 extern struct vm_struct *remove_vm_area(const void *addr);
113 extern struct vm_struct *find_vm_area(const void *addr);
114 
115 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
116                         struct page ***pages);
117 #ifdef CONFIG_MMU
118 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
119                                     pgprot_t prot, struct page **pages);
120 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
121 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
122 #else
123 static inline int
124 map_kernel_range_noflush(unsigned long start, unsigned long size,
125                         pgprot_t prot, struct page **pages)
126 {
127         return size >> PAGE_SHIFT;
128 }
129 static inline void
130 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
131 {
132 }
133 static inline void
134 unmap_kernel_range(unsigned long addr, unsigned long size)
135 {
136 }
137 #endif
138 
139 /* Allocate/destroy a 'vmalloc' VM area. */
140 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
141 extern void free_vm_area(struct vm_struct *area);
142 
143 /* for /dev/kmem */
144 extern long vread(char *buf, char *addr, unsigned long count);
145 extern long vwrite(char *buf, char *addr, unsigned long count);
146 
147 /*
148  *      Internals.  Dont't use..
149  */
150 extern struct list_head vmap_area_list;
151 extern __init void vm_area_add_early(struct vm_struct *vm);
152 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
153 
154 #ifdef CONFIG_SMP
155 # ifdef CONFIG_MMU
156 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
157                                      const size_t *sizes, int nr_vms,
158                                      size_t align);
159 
160 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
161 # else
162 static inline struct vm_struct **
163 pcpu_get_vm_areas(const unsigned long *offsets,
164                 const size_t *sizes, int nr_vms,
165                 size_t align)
166 {
167         return NULL;
168 }
169 
170 static inline void
171 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
172 {
173 }
174 # endif
175 #endif
176 
177 struct vmalloc_info {
178         unsigned long   used;
179         unsigned long   largest_chunk;
180 };
181 
182 #ifdef CONFIG_MMU
183 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
184 extern void get_vmalloc_info(struct vmalloc_info *vmi);
185 #else
186 
187 #define VMALLOC_TOTAL 0UL
188 #define get_vmalloc_info(vmi)                   \
189 do {                                            \
190         (vmi)->used = 0;                        \
191         (vmi)->largest_chunk = 0;               \
192 } while (0)
193 #endif
194 
195 #endif /* _LINUX_VMALLOC_H */
196 

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