1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_VMALLOC_H
3#define _LINUX_VMALLOC_H
4
5#include <linux/alloc_tag.h>
6#include <linux/sched.h>
7#include <linux/spinlock.h>
8#include <linux/init.h>
9#include <linux/list.h>
10#include <linux/llist.h>
11#include <asm/page.h> /* pgprot_t */
12#include <linux/rbtree.h>
13#include <linux/overflow.h>
14
15#include <asm/vmalloc.h>
16
17struct vm_area_struct; /* vma defining user mapping in mm_types.h */
18struct notifier_block; /* in notifier.h */
19struct iov_iter; /* in uio.h */
20
21/* bits in flags of vmalloc's vm_struct below */
22#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
23#define VM_ALLOC 0x00000002 /* vmalloc() */
24#define VM_MAP 0x00000004 /* vmap()ed pages */
25#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
26#define VM_DMA_COHERENT 0x00000010 /* dma_alloc_coherent */
27#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
28#define VM_NO_GUARD 0x00000040 /* ***DANGEROUS*** don't add guard page */
29#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
30#define VM_FLUSH_RESET_PERMS 0x00000100 /* reset direct map and flush TLB on unmap, can't be freed in atomic context */
31#define VM_MAP_PUT_PAGES 0x00000200 /* put pages and free array in vfree */
32#define VM_ALLOW_HUGE_VMAP 0x00000400 /* Allow for huge pages on archs with HAVE_ARCH_HUGE_VMALLOC */
33
34#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
35 !defined(CONFIG_KASAN_VMALLOC)
36#define VM_DEFER_KMEMLEAK 0x00000800 /* defer kmemleak object creation */
37#else
38#define VM_DEFER_KMEMLEAK 0
39#endif
40#define VM_SPARSE 0x00001000 /* sparse vm_area. not all pages are present. */
41
42/* bits [20..32] reserved for arch specific ioremap internals */
43
44/*
45 * Maximum alignment for ioremap() regions.
46 * Can be overridden by arch-specific value.
47 */
48#ifndef IOREMAP_MAX_ORDER
49#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
50#endif
51
52struct vm_struct {
53 struct vm_struct *next;
54 void *addr;
55 unsigned long size;
56 unsigned long flags;
57 struct page **pages;
58#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
59 unsigned int page_order;
60#endif
61 unsigned int nr_pages;
62 phys_addr_t phys_addr;
63 const void *caller;
64 unsigned long requested_size;
65};
66
67struct vmap_area {
68 unsigned long va_start;
69 unsigned long va_end;
70
71 struct rb_node rb_node; /* address sorted rbtree */
72 struct list_head list; /* address sorted list */
73
74 /*
75 * The following two variables can be packed, because
76 * a vmap_area object can be either:
77 * 1) in "free" tree (root is free_vmap_area_root)
78 * 2) or "busy" tree (root is vmap_area_root)
79 */
80 union {
81 unsigned long subtree_max_size; /* in "free" tree */
82 struct vm_struct *vm; /* in "busy" tree */
83 };
84 unsigned long flags; /* mark type of vm_map_ram area */
85};
86
87/* archs that select HAVE_ARCH_HUGE_VMAP should override one or more of these */
88#ifndef arch_vmap_p4d_supported
89static inline bool arch_vmap_p4d_supported(pgprot_t prot)
90{
91 return false;
92}
93#endif
94
95#ifndef arch_vmap_pud_supported
96static inline bool arch_vmap_pud_supported(pgprot_t prot)
97{
98 return false;
99}
100#endif
101
102#ifndef arch_vmap_pmd_supported
103static inline bool arch_vmap_pmd_supported(pgprot_t prot)
104{
105 return false;
106}
107#endif
108
109#ifndef arch_vmap_pte_range_map_size
110static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr, unsigned long end,
111 u64 pfn, unsigned int max_page_shift)
112{
113 return PAGE_SIZE;
114}
115#endif
116
117#ifndef arch_vmap_pte_range_unmap_size
118static inline unsigned long arch_vmap_pte_range_unmap_size(unsigned long addr,
119 pte_t *ptep)
120{
121 return PAGE_SIZE;
122}
123#endif
124
125#ifndef arch_vmap_pte_supported_shift
126static inline int arch_vmap_pte_supported_shift(unsigned long size)
127{
128 return PAGE_SHIFT;
129}
130#endif
131
132#ifndef arch_vmap_pgprot_tagged
133static inline pgprot_t arch_vmap_pgprot_tagged(pgprot_t prot)
134{
135 return prot;
136}
137#endif
138
139/*
140 * Highlevel APIs for driver use
141 */
142extern void vm_unmap_ram(const void *mem, unsigned int count);
143extern void *vm_map_ram(struct page **pages, unsigned int count, int node);
144extern void vm_unmap_aliases(void);
145
146extern void *vmalloc_noprof(unsigned long size) __alloc_size(1);
147#define vmalloc(...) alloc_hooks(vmalloc_noprof(__VA_ARGS__))
148
149extern void *vzalloc_noprof(unsigned long size) __alloc_size(1);
150#define vzalloc(...) alloc_hooks(vzalloc_noprof(__VA_ARGS__))
151
152extern void *vmalloc_user_noprof(unsigned long size) __alloc_size(1);
153#define vmalloc_user(...) alloc_hooks(vmalloc_user_noprof(__VA_ARGS__))
154
155extern void *vmalloc_node_noprof(unsigned long size, int node) __alloc_size(1);
156#define vmalloc_node(...) alloc_hooks(vmalloc_node_noprof(__VA_ARGS__))
157
158extern void *vzalloc_node_noprof(unsigned long size, int node) __alloc_size(1);
159#define vzalloc_node(...) alloc_hooks(vzalloc_node_noprof(__VA_ARGS__))
160
161extern void *vmalloc_32_noprof(unsigned long size) __alloc_size(1);
162#define vmalloc_32(...) alloc_hooks(vmalloc_32_noprof(__VA_ARGS__))
163
164extern void *vmalloc_32_user_noprof(unsigned long size) __alloc_size(1);
165#define vmalloc_32_user(...) alloc_hooks(vmalloc_32_user_noprof(__VA_ARGS__))
166
167extern void *__vmalloc_noprof(unsigned long size, gfp_t gfp_mask) __alloc_size(1);
168#define __vmalloc(...) alloc_hooks(__vmalloc_noprof(__VA_ARGS__))
169
170extern void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,
171 unsigned long start, unsigned long end, gfp_t gfp_mask,
172 pgprot_t prot, unsigned long vm_flags, int node,
173 const void *caller) __alloc_size(1);
174#define __vmalloc_node_range(...) alloc_hooks(__vmalloc_node_range_noprof(__VA_ARGS__))
175
176void *__vmalloc_node_noprof(unsigned long size, unsigned long align, gfp_t gfp_mask,
177 int node, const void *caller) __alloc_size(1);
178#define __vmalloc_node(...) alloc_hooks(__vmalloc_node_noprof(__VA_ARGS__))
179
180void *vmalloc_huge_node_noprof(unsigned long size, gfp_t gfp_mask, int node) __alloc_size(1);
181#define vmalloc_huge_node(...) alloc_hooks(vmalloc_huge_node_noprof(__VA_ARGS__))
182
183static inline void *vmalloc_huge(unsigned long size, gfp_t gfp_mask)
184{
185 return vmalloc_huge_node(size, gfp_mask, NUMA_NO_NODE);
186}
187
188extern void *__vmalloc_array_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
189#define __vmalloc_array(...) alloc_hooks(__vmalloc_array_noprof(__VA_ARGS__))
190
191extern void *vmalloc_array_noprof(size_t n, size_t size) __alloc_size(1, 2);
192#define vmalloc_array(...) alloc_hooks(vmalloc_array_noprof(__VA_ARGS__))
193
194extern void *__vcalloc_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
195#define __vcalloc(...) alloc_hooks(__vcalloc_noprof(__VA_ARGS__))
196
197extern void *vcalloc_noprof(size_t n, size_t size) __alloc_size(1, 2);
198#define vcalloc(...) alloc_hooks(vcalloc_noprof(__VA_ARGS__))
199
200void * __must_check vrealloc_noprof(const void *p, size_t size, gfp_t flags)
201 __realloc_size(2);
202#define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__))
203
204extern void vfree(const void *addr);
205extern void vfree_atomic(const void *addr);
206
207extern void *vmap(struct page **pages, unsigned int count,
208 unsigned long flags, pgprot_t prot);
209void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot);
210extern void vunmap(const void *addr);
211
212extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
213 unsigned long uaddr, void *kaddr,
214 unsigned long pgoff, unsigned long size);
215
216extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
217 unsigned long pgoff);
218
219int vmap_pages_range(unsigned long addr, unsigned long end, pgprot_t prot,
220 struct page **pages, unsigned int page_shift);
221
222/*
223 * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values
224 * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings()
225 * needs to be called.
226 */
227#ifndef ARCH_PAGE_TABLE_SYNC_MASK
228#define ARCH_PAGE_TABLE_SYNC_MASK 0
229#endif
230
231/*
232 * There is no default implementation for arch_sync_kernel_mappings(). It is
233 * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK
234 * is 0.
235 */
236void arch_sync_kernel_mappings(unsigned long start, unsigned long end);
237
238/*
239 * Lowlevel-APIs (not for driver use!)
240 */
241
242static inline size_t get_vm_area_size(const struct vm_struct *area)
243{
244 if (!(area->flags & VM_NO_GUARD))
245 /* return actual size without guard page */
246 return area->size - PAGE_SIZE;
247 else
248 return area->size;
249
250}
251
252extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
253extern struct vm_struct *get_vm_area_caller(unsigned long size,
254 unsigned long flags, const void *caller);
255extern struct vm_struct *__get_vm_area_caller(unsigned long size,
256 unsigned long flags,
257 unsigned long start, unsigned long end,
258 const void *caller);
259void free_vm_area(struct vm_struct *area);
260extern struct vm_struct *remove_vm_area(const void *addr);
261extern struct vm_struct *find_vm_area(const void *addr);
262struct vmap_area *find_vmap_area(unsigned long addr);
263
264static inline bool is_vm_area_hugepages(const void *addr)
265{
266 /*
267 * This may not 100% tell if the area is mapped with > PAGE_SIZE
268 * page table entries, if for some reason the architecture indicates
269 * larger sizes are available but decides not to use them, nothing
270 * prevents that. This only indicates the size of the physical page
271 * allocated in the vmalloc layer.
272 */
273#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
274 return find_vm_area(addr)->page_order > 0;
275#else
276 return false;
277#endif
278}
279
280/* for /proc/kcore */
281long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
282
283/*
284 * Internals. Don't use..
285 */
286__init void vm_area_add_early(struct vm_struct *vm);
287__init void vm_area_register_early(struct vm_struct *vm, size_t align);
288
289int register_vmap_purge_notifier(struct notifier_block *nb);
290int unregister_vmap_purge_notifier(struct notifier_block *nb);
291
292#ifdef CONFIG_MMU
293#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
294
295unsigned long vmalloc_nr_pages(void);
296
297int vm_area_map_pages(struct vm_struct *area, unsigned long start,
298 unsigned long end, struct page **pages);
299void vm_area_unmap_pages(struct vm_struct *area, unsigned long start,
300 unsigned long end);
301void vunmap_range(unsigned long addr, unsigned long end);
302
303static inline void set_vm_flush_reset_perms(void *addr)
304{
305 struct vm_struct *vm = find_vm_area(addr);
306
307 if (vm)
308 vm->flags |= VM_FLUSH_RESET_PERMS;
309}
310#else /* !CONFIG_MMU */
311#define VMALLOC_TOTAL 0UL
312
313static inline unsigned long vmalloc_nr_pages(void) { return 0; }
314static inline void set_vm_flush_reset_perms(void *addr) {}
315#endif /* CONFIG_MMU */
316
317#if defined(CONFIG_MMU) && defined(CONFIG_SMP)
318struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
319 const size_t *sizes, int nr_vms,
320 size_t align);
321
322void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
323# else
324static inline struct vm_struct **
325pcpu_get_vm_areas(const unsigned long *offsets,
326 const size_t *sizes, int nr_vms,
327 size_t align)
328{
329 return NULL;
330}
331
332static inline void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) {}
333#endif
334
335#if defined(CONFIG_MMU) && defined(CONFIG_PRINTK)
336bool vmalloc_dump_obj(void *object);
337#else
338static inline bool vmalloc_dump_obj(void *object) { return false; }
339#endif
340
341#endif /* _LINUX_VMALLOC_H */
342

source code of linux/include/linux/vmalloc.h

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