1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_VMALLOC_H
3 #define _LINUX_VMALLOC_H
5 #include <linux/spinlock.h>
6 #include <linux/init.h>
7 #include <linux/list.h>
8 #include <linux/llist.h>
9 #include <asm/page.h> /* pgprot_t */
10 #include <linux/rbtree.h>
11 #include <linux/overflow.h>
13 #include <asm/vmalloc.h>
15 struct vm_area_struct; /* vma defining user mapping in mm_types.h */
16 struct notifier_block; /* in notifier.h */
18 /* bits in flags of vmalloc's vm_struct below */
19 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */
20 #define VM_ALLOC 0x00000002 /* vmalloc() */
21 #define VM_MAP 0x00000004 /* vmap()ed pages */
22 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
23 #define VM_DMA_COHERENT 0x00000010 /* dma_alloc_coherent */
24 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
25 #define VM_NO_GUARD 0x00000040 /* don't add guard page */
26 #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
27 #define VM_FLUSH_RESET_PERMS 0x00000100 /* reset direct map and flush TLB on unmap, can't be freed in atomic context */
28 #define VM_MAP_PUT_PAGES 0x00000200 /* put pages and free array in vfree */
29 #define VM_NO_HUGE_VMAP 0x00000400 /* force PAGE_SIZE pte mapping */
31 #if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
32 !defined(CONFIG_KASAN_VMALLOC)
33 #define VM_DEFER_KMEMLEAK 0x00000800 /* defer kmemleak object creation */
35 #define VM_DEFER_KMEMLEAK 0
39 * VM_KASAN is used slightly differently depending on CONFIG_KASAN_VMALLOC.
41 * If IS_ENABLED(CONFIG_KASAN_VMALLOC), VM_KASAN is set on a vm_struct after
42 * shadow memory has been mapped. It's used to handle allocation errors so that
43 * we don't try to poison shadow on free if it was never allocated.
45 * Otherwise, VM_KASAN is set for kasan_module_alloc() allocations and used to
46 * determine which allocations need the module shadow freed.
49 /* bits [20..32] reserved for arch specific ioremap internals */
52 * Maximum alignment for ioremap() regions.
53 * Can be overridden by arch-specific value.
55 #ifndef IOREMAP_MAX_ORDER
56 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
60 struct vm_struct *next;
65 #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
66 unsigned int page_order;
68 unsigned int nr_pages;
69 phys_addr_t phys_addr;
74 unsigned long va_start;
77 struct rb_node rb_node; /* address sorted rbtree */
78 struct list_head list; /* address sorted list */
81 * The following two variables can be packed, because
82 * a vmap_area object can be either:
83 * 1) in "free" tree (root is vmap_area_root)
84 * 2) or "busy" tree (root is free_vmap_area_root)
87 unsigned long subtree_max_size; /* in "free" tree */
88 struct vm_struct *vm; /* in "busy" tree */
92 /* archs that select HAVE_ARCH_HUGE_VMAP should override one or more of these */
93 #ifndef arch_vmap_p4d_supported
94 static inline bool arch_vmap_p4d_supported(pgprot_t prot)
100 #ifndef arch_vmap_pud_supported
101 static inline bool arch_vmap_pud_supported(pgprot_t prot)
107 #ifndef arch_vmap_pmd_supported
108 static inline bool arch_vmap_pmd_supported(pgprot_t prot)
114 #ifndef arch_vmap_pte_range_map_size
115 static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr, unsigned long end,
116 u64 pfn, unsigned int max_page_shift)
122 #ifndef arch_vmap_pte_supported_shift
123 static inline int arch_vmap_pte_supported_shift(unsigned long size)
130 * Highlevel APIs for driver use
132 extern void vm_unmap_ram(const void *mem, unsigned int count);
133 extern void *vm_map_ram(struct page **pages, unsigned int count, int node);
134 extern void vm_unmap_aliases(void);
137 extern void __init vmalloc_init(void);
138 extern unsigned long vmalloc_nr_pages(void);
140 static inline void vmalloc_init(void)
143 static inline unsigned long vmalloc_nr_pages(void) { return 0; }
146 extern void *vmalloc(unsigned long size);
147 extern void *vzalloc(unsigned long size);
148 extern void *vmalloc_user(unsigned long size);
149 extern void *vmalloc_node(unsigned long size, int node);
150 extern void *vzalloc_node(unsigned long size, int node);
151 extern void *vmalloc_32(unsigned long size);
152 extern void *vmalloc_32_user(unsigned long size);
153 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask);
154 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
155 unsigned long start, unsigned long end, gfp_t gfp_mask,
156 pgprot_t prot, unsigned long vm_flags, int node,
158 void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask,
159 int node, const void *caller);
160 void *vmalloc_no_huge(unsigned long size);
162 extern void *__vmalloc_array(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
163 extern void *vmalloc_array(size_t n, size_t size) __alloc_size(1, 2);
164 extern void *__vcalloc(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2);
165 extern void *vcalloc(size_t n, size_t size) __alloc_size(1, 2);
167 extern void vfree(const void *addr);
168 extern void vfree_atomic(const void *addr);
170 extern void *vmap(struct page **pages, unsigned int count,
171 unsigned long flags, pgprot_t prot);
172 void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot);
173 extern void vunmap(const void *addr);
175 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
176 unsigned long uaddr, void *kaddr,
177 unsigned long pgoff, unsigned long size);
179 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
180 unsigned long pgoff);
183 * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values
184 * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings()
185 * needs to be called.
187 #ifndef ARCH_PAGE_TABLE_SYNC_MASK
188 #define ARCH_PAGE_TABLE_SYNC_MASK 0
192 * There is no default implementation for arch_sync_kernel_mappings(). It is
193 * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK
196 void arch_sync_kernel_mappings(unsigned long start, unsigned long end);
199 * Lowlevel-APIs (not for driver use!)
202 static inline size_t get_vm_area_size(const struct vm_struct *area)
204 if (!(area->flags & VM_NO_GUARD))
205 /* return actual size without guard page */
206 return area->size - PAGE_SIZE;
212 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
213 extern struct vm_struct *get_vm_area_caller(unsigned long size,
214 unsigned long flags, const void *caller);
215 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
217 unsigned long start, unsigned long end,
219 void free_vm_area(struct vm_struct *area);
220 extern struct vm_struct *remove_vm_area(const void *addr);
221 extern struct vm_struct *find_vm_area(const void *addr);
223 static inline bool is_vm_area_hugepages(const void *addr)
226 * This may not 100% tell if the area is mapped with > PAGE_SIZE
227 * page table entries, if for some reason the architecture indicates
228 * larger sizes are available but decides not to use them, nothing
229 * prevents that. This only indicates the size of the physical page
230 * allocated in the vmalloc layer.
232 #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
233 return find_vm_area(addr)->page_order > 0;
240 void vunmap_range(unsigned long addr, unsigned long end);
241 static inline void set_vm_flush_reset_perms(void *addr)
243 struct vm_struct *vm = find_vm_area(addr);
246 vm->flags |= VM_FLUSH_RESET_PERMS;
250 static inline void set_vm_flush_reset_perms(void *addr)
255 /* for /proc/kcore */
256 extern long vread(char *buf, char *addr, unsigned long count);
259 * Internals. Don't use..
261 extern struct list_head vmap_area_list;
262 extern __init void vm_area_add_early(struct vm_struct *vm);
263 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
267 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
268 const size_t *sizes, int nr_vms,
271 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
273 static inline struct vm_struct **
274 pcpu_get_vm_areas(const unsigned long *offsets,
275 const size_t *sizes, int nr_vms,
282 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
289 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
291 #define VMALLOC_TOTAL 0UL
294 int register_vmap_purge_notifier(struct notifier_block *nb);
295 int unregister_vmap_purge_notifier(struct notifier_block *nb);
297 #if defined(CONFIG_MMU) && defined(CONFIG_PRINTK)
298 bool vmalloc_dump_obj(void *object);
300 static inline bool vmalloc_dump_obj(void *object) { return false; }
303 #endif /* _LINUX_VMALLOC_H */