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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 #define VM_NO_GUARD             0x00000040      /* don't add guard page */
 20 #define VM_KASAN                0x00000080      /* has allocated kasan shadow memory */
 21 /* bits [20..32] reserved for arch specific ioremap internals */
 22 
 23 /*
 24  * Maximum alignment for ioremap() regions.
 25  * Can be overriden by arch-specific value.
 26  */
 27 #ifndef IOREMAP_MAX_ORDER
 28 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
 29 #endif
 30 
 31 struct vm_struct {
 32         struct vm_struct        *next;
 33         void                    *addr;
 34         unsigned long           size;
 35         unsigned long           flags;
 36         struct page             **pages;
 37         unsigned int            nr_pages;
 38         phys_addr_t             phys_addr;
 39         const void              *caller;
 40 };
 41 
 42 struct vmap_area {
 43         unsigned long va_start;
 44         unsigned long va_end;
 45         unsigned long flags;
 46         struct rb_node rb_node;         /* address sorted rbtree */
 47         struct list_head list;          /* address sorted list */
 48         struct list_head purge_list;    /* "lazy purge" list */
 49         struct vm_struct *vm;
 50         struct rcu_head rcu_head;
 51 };
 52 
 53 /*
 54  *      Highlevel APIs for driver use
 55  */
 56 extern void vm_unmap_ram(const void *mem, unsigned int count);
 57 extern void *vm_map_ram(struct page **pages, unsigned int count,
 58                                 int node, pgprot_t prot);
 59 extern void vm_unmap_aliases(void);
 60 
 61 #ifdef CONFIG_MMU
 62 extern void __init vmalloc_init(void);
 63 #else
 64 static inline void vmalloc_init(void)
 65 {
 66 }
 67 #endif
 68 
 69 extern void *vmalloc(unsigned long size);
 70 extern void *vzalloc(unsigned long size);
 71 extern void *vmalloc_user(unsigned long size);
 72 extern void *vmalloc_node(unsigned long size, int node);
 73 extern void *vzalloc_node(unsigned long size, int node);
 74 extern void *vmalloc_exec(unsigned long size);
 75 extern void *vmalloc_32(unsigned long size);
 76 extern void *vmalloc_32_user(unsigned long size);
 77 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
 78 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
 79                         unsigned long start, unsigned long end, gfp_t gfp_mask,
 80                         pgprot_t prot, unsigned long vm_flags, int node,
 81                         const void *caller);
 82 
 83 extern void vfree(const void *addr);
 84 
 85 extern void *vmap(struct page **pages, unsigned int count,
 86                         unsigned long flags, pgprot_t prot);
 87 extern void vunmap(const void *addr);
 88 
 89 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
 90                                        unsigned long uaddr, void *kaddr,
 91                                        unsigned long size);
 92 
 93 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 94                                                         unsigned long pgoff);
 95 void vmalloc_sync_all(void);
 96  
 97 /*
 98  *      Lowlevel-APIs (not for driver use!)
 99  */
100 
101 static inline size_t get_vm_area_size(const struct vm_struct *area)
102 {
103         if (!(area->flags & VM_NO_GUARD))
104                 /* return actual size without guard page */
105                 return area->size - PAGE_SIZE;
106         else
107                 return area->size;
108 
109 }
110 
111 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
112 extern struct vm_struct *get_vm_area_caller(unsigned long size,
113                                         unsigned long flags, const void *caller);
114 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
115                                         unsigned long start, unsigned long end);
116 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
117                                         unsigned long flags,
118                                         unsigned long start, unsigned long end,
119                                         const void *caller);
120 extern struct vm_struct *remove_vm_area(const void *addr);
121 extern struct vm_struct *find_vm_area(const void *addr);
122 
123 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
124                         struct page **pages);
125 #ifdef CONFIG_MMU
126 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
127                                     pgprot_t prot, struct page **pages);
128 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
129 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
130 #else
131 static inline int
132 map_kernel_range_noflush(unsigned long start, unsigned long size,
133                         pgprot_t prot, struct page **pages)
134 {
135         return size >> PAGE_SHIFT;
136 }
137 static inline void
138 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
139 {
140 }
141 static inline void
142 unmap_kernel_range(unsigned long addr, unsigned long size)
143 {
144 }
145 #endif
146 
147 /* Allocate/destroy a 'vmalloc' VM area. */
148 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
149 extern void free_vm_area(struct vm_struct *area);
150 
151 /* for /dev/kmem */
152 extern long vread(char *buf, char *addr, unsigned long count);
153 extern long vwrite(char *buf, char *addr, unsigned long count);
154 
155 /*
156  *      Internals.  Dont't use..
157  */
158 extern struct list_head vmap_area_list;
159 extern __init void vm_area_add_early(struct vm_struct *vm);
160 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
161 
162 #ifdef CONFIG_SMP
163 # ifdef CONFIG_MMU
164 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
165                                      const size_t *sizes, int nr_vms,
166                                      size_t align);
167 
168 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
169 # else
170 static inline struct vm_struct **
171 pcpu_get_vm_areas(const unsigned long *offsets,
172                 const size_t *sizes, int nr_vms,
173                 size_t align)
174 {
175         return NULL;
176 }
177 
178 static inline void
179 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
180 {
181 }
182 # endif
183 #endif
184 
185 struct vmalloc_info {
186         unsigned long   used;
187         unsigned long   largest_chunk;
188 };
189 
190 #ifdef CONFIG_MMU
191 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
192 extern void get_vmalloc_info(struct vmalloc_info *vmi);
193 #else
194 
195 #define VMALLOC_TOTAL 0UL
196 #define get_vmalloc_info(vmi)                   \
197 do {                                            \
198         (vmi)->used = 0;                        \
199         (vmi)->largest_chunk = 0;               \
200 } while (0)
201 #endif
202 
203 #endif /* _LINUX_VMALLOC_H */
204 

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