Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
10struct 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
29struct 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
40struct 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 */
54extern void vm_unmap_ram(const void *mem, unsigned int count);
55extern void *vm_map_ram(struct page **pages, unsigned int count,
56 int node, pgprot_t prot);
57extern void vm_unmap_aliases(void);
58
59#ifdef CONFIG_MMU
60extern void __init vmalloc_init(void);
61#else
62static inline void vmalloc_init(void)
63{
64}
65#endif
66
67extern void *vmalloc(unsigned long size);
68extern void *vzalloc(unsigned long size);
69extern void *vmalloc_user(unsigned long size);
70extern void *vmalloc_node(unsigned long size, int node);
71extern void *vzalloc_node(unsigned long size, int node);
72extern void *vmalloc_exec(unsigned long size);
73extern void *vmalloc_32(unsigned long size);
74extern void *vmalloc_32_user(unsigned long size);
75extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
76extern 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);
79extern void vfree(const void *addr);
80
81extern void *vmap(struct page **pages, unsigned int count,
82 unsigned long flags, pgprot_t prot);
83extern void vunmap(const void *addr);
84
85extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
86 unsigned long uaddr, void *kaddr,
87 unsigned long size);
88
89extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
90 unsigned long pgoff);
91void vmalloc_sync_all(void);
92
93/*
94 * Lowlevel-APIs (not for driver use!)
95 */
96
97static 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
103extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
104extern struct vm_struct *get_vm_area_caller(unsigned long size,
105 unsigned long flags, const void *caller);
106extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
107 unsigned long start, unsigned long end);
108extern 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);
112extern struct vm_struct *remove_vm_area(const void *addr);
113extern struct vm_struct *find_vm_area(const void *addr);
114
115extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
116 struct page ***pages);
117#ifdef CONFIG_MMU
118extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
119 pgprot_t prot, struct page **pages);
120extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
121extern void unmap_kernel_range(unsigned long addr, unsigned long size);
122#else
123static inline int
124map_kernel_range_noflush(unsigned long start, unsigned long size,
125 pgprot_t prot, struct page **pages)
126{
127 return size >> PAGE_SHIFT;
128}
129static inline void
130unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
131{
132}
133static inline void
134unmap_kernel_range(unsigned long addr, unsigned long size)
135{
136}
137#endif
138
139/* Allocate/destroy a 'vmalloc' VM area. */
140extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
141extern void free_vm_area(struct vm_struct *area);
142
143/* for /dev/kmem */
144extern long vread(char *buf, char *addr, unsigned long count);
145extern long vwrite(char *buf, char *addr, unsigned long count);
146
147/*
148 * Internals. Dont't use..
149 */
150extern struct list_head vmap_area_list;
151extern __init void vm_area_add_early(struct vm_struct *vm);
152extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
153
154#ifdef CONFIG_SMP
155# ifdef CONFIG_MMU
156struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
157 const size_t *sizes, int nr_vms,
158 size_t align);
159
160void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
161# else
162static inline struct vm_struct **
163pcpu_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
170static inline void
171pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
172{
173}
174# endif
175#endif
176
177struct 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)
184extern void get_vmalloc_info(struct vmalloc_info *vmi);
185#else
186
187#define VMALLOC_TOTAL 0UL
188#define get_vmalloc_info(vmi) \
189do { \
190 (vmi)->used = 0; \
191 (vmi)->largest_chunk = 0; \
192} while (0)
193#endif
194
195#endif /* _LINUX_VMALLOC_H */