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 17 struct vm_area_struct; /* vma defining user mapping in mm_types.h */ 18 struct notifier_block; /* in notifier.h */ 19 struct 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 52 struct 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 }; 65 66 struct vmap_area { 67 unsigned long va_start; 68 unsigned long va_end; 69 70 struct rb_node rb_node; /* address sorted rbtree */ 71 struct list_head list; /* address sorted list */ 72 73 /* 74 * The following two variables can be packed, because 75 * a vmap_area object can be either: 76 * 1) in "free" tree (root is free_vmap_area_root) 77 * 2) or "busy" tree (root is vmap_area_root) 78 */ 79 union { 80 unsigned long subtree_max_size; /* in "free" tree */ 81 struct vm_struct *vm; /* in "busy" tree */ 82 }; 83 unsigned long flags; /* mark type of vm_map_ram area */ 84 }; 85 86 /* archs that select HAVE_ARCH_HUGE_VMAP should override one or more of these */ 87 #ifndef arch_vmap_p4d_supported 88 static inline bool arch_vmap_p4d_supported(pgprot_t prot) 89 { 90 return false; 91 } 92 #endif 93 94 #ifndef arch_vmap_pud_supported 95 static inline bool arch_vmap_pud_supported(pgprot_t prot) 96 { 97 return false; 98 } 99 #endif 100 101 #ifndef arch_vmap_pmd_supported 102 static inline bool arch_vmap_pmd_supported(pgprot_t prot) 103 { 104 return false; 105 } 106 #endif 107 108 #ifndef arch_vmap_pte_range_map_size 109 static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr, unsigned long end, 110 u64 pfn, unsigned int max_page_shift) 111 { 112 return PAGE_SIZE; 113 } 114 #endif 115 116 #ifndef arch_vmap_pte_supported_shift 117 static inline int arch_vmap_pte_supported_shift(unsigned long size) 118 { 119 return PAGE_SHIFT; 120 } 121 #endif 122 123 #ifndef arch_vmap_pgprot_tagged 124 static inline pgprot_t arch_vmap_pgprot_tagged(pgprot_t prot) 125 { 126 return prot; 127 } 128 #endif 129 130 /* 131 * Highlevel APIs for driver use 132 */ 133 extern void vm_unmap_ram(const void *mem, unsigned int count); 134 extern void *vm_map_ram(struct page **pages, unsigned int count, int node); 135 extern void vm_unmap_aliases(void); 136 137 extern void *vmalloc_noprof(unsigned long size) __alloc_size(1); 138 #define vmalloc(...) alloc_hooks(vmalloc_noprof(__VA_ARGS__)) 139 140 extern void *vzalloc_noprof(unsigned long size) __alloc_size(1); 141 #define vzalloc(...) alloc_hooks(vzalloc_noprof(__VA_ARGS__)) 142 143 extern void *vmalloc_user_noprof(unsigned long size) __alloc_size(1); 144 #define vmalloc_user(...) alloc_hooks(vmalloc_user_noprof(__VA_ARGS__)) 145 146 extern void *vmalloc_node_noprof(unsigned long size, int node) __alloc_size(1); 147 #define vmalloc_node(...) alloc_hooks(vmalloc_node_noprof(__VA_ARGS__)) 148 149 extern void *vzalloc_node_noprof(unsigned long size, int node) __alloc_size(1); 150 #define vzalloc_node(...) alloc_hooks(vzalloc_node_noprof(__VA_ARGS__)) 151 152 extern void *vmalloc_32_noprof(unsigned long size) __alloc_size(1); 153 #define vmalloc_32(...) alloc_hooks(vmalloc_32_noprof(__VA_ARGS__)) 154 155 extern void *vmalloc_32_user_noprof(unsigned long size) __alloc_size(1); 156 #define vmalloc_32_user(...) alloc_hooks(vmalloc_32_user_noprof(__VA_ARGS__)) 157 158 extern void *__vmalloc_noprof(unsigned long size, gfp_t gfp_mask) __alloc_size(1); 159 #define __vmalloc(...) alloc_hooks(__vmalloc_noprof(__VA_ARGS__)) 160 161 extern void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align, 162 unsigned long start, unsigned long end, gfp_t gfp_mask, 163 pgprot_t prot, unsigned long vm_flags, int node, 164 const void *caller) __alloc_size(1); 165 #define __vmalloc_node_range(...) alloc_hooks(__vmalloc_node_range_noprof(__VA_ARGS__)) 166 167 void *__vmalloc_node_noprof(unsigned long size, unsigned long align, gfp_t gfp_mask, 168 int node, const void *caller) __alloc_size(1); 169 #define __vmalloc_node(...) alloc_hooks(__vmalloc_node_noprof(__VA_ARGS__)) 170 171 void *vmalloc_huge_noprof(unsigned long size, gfp_t gfp_mask) __alloc_size(1); 172 #define vmalloc_huge(...) alloc_hooks(vmalloc_huge_noprof(__VA_ARGS__)) 173 174 extern void *__vmalloc_array_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2); 175 #define __vmalloc_array(...) alloc_hooks(__vmalloc_array_noprof(__VA_ARGS__)) 176 177 extern void *vmalloc_array_noprof(size_t n, size_t size) __alloc_size(1, 2); 178 #define vmalloc_array(...) alloc_hooks(vmalloc_array_noprof(__VA_ARGS__)) 179 180 extern void *__vcalloc_noprof(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2); 181 #define __vcalloc(...) alloc_hooks(__vcalloc_noprof(__VA_ARGS__)) 182 183 extern void *vcalloc_noprof(size_t n, size_t size) __alloc_size(1, 2); 184 #define vcalloc(...) alloc_hooks(vcalloc_noprof(__VA_ARGS__)) 185 186 void * __must_check vrealloc_noprof(const void *p, size_t size, gfp_t flags) 187 __realloc_size(2); 188 #define vrealloc(...) alloc_hooks(vrealloc_noprof(__VA_ARGS__)) 189 190 extern void vfree(const void *addr); 191 extern void vfree_atomic(const void *addr); 192 193 extern void *vmap(struct page **pages, unsigned int count, 194 unsigned long flags, pgprot_t prot); 195 void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot); 196 extern void vunmap(const void *addr); 197 198 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 199 unsigned long uaddr, void *kaddr, 200 unsigned long pgoff, unsigned long size); 201 202 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 203 unsigned long pgoff); 204 205 /* 206 * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values 207 * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings() 208 * needs to be called. 209 */ 210 #ifndef ARCH_PAGE_TABLE_SYNC_MASK 211 #define ARCH_PAGE_TABLE_SYNC_MASK 0 212 #endif 213 214 /* 215 * There is no default implementation for arch_sync_kernel_mappings(). It is 216 * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK 217 * is 0. 218 */ 219 void arch_sync_kernel_mappings(unsigned long start, unsigned long end); 220 221 /* 222 * Lowlevel-APIs (not for driver use!) 223 */ 224 225 static inline size_t get_vm_area_size(const struct vm_struct *area) 226 { 227 if (!(area->flags & VM_NO_GUARD)) 228 /* return actual size without guard page */ 229 return area->size - PAGE_SIZE; 230 else 231 return area->size; 232 233 } 234 235 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 236 extern struct vm_struct *get_vm_area_caller(unsigned long size, 237 unsigned long flags, const void *caller); 238 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 239 unsigned long flags, 240 unsigned long start, unsigned long end, 241 const void *caller); 242 void free_vm_area(struct vm_struct *area); 243 extern struct vm_struct *remove_vm_area(const void *addr); 244 extern struct vm_struct *find_vm_area(const void *addr); 245 struct vmap_area *find_vmap_area(unsigned long addr); 246 247 static inline bool is_vm_area_hugepages(const void *addr) 248 { 249 /* 250 * This may not 100% tell if the area is mapped with > PAGE_SIZE 251 * page table entries, if for some reason the architecture indicates 252 * larger sizes are available but decides not to use them, nothing 253 * prevents that. This only indicates the size of the physical page 254 * allocated in the vmalloc layer. 255 */ 256 #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC 257 return find_vm_area(addr)->page_order > 0; 258 #else 259 return false; 260 #endif 261 } 262 263 /* for /proc/kcore */ 264 long vread_iter(struct iov_iter *iter, const char *addr, size_t count); 265 266 /* 267 * Internals. Don't use.. 268 */ 269 __init void vm_area_add_early(struct vm_struct *vm); 270 __init void vm_area_register_early(struct vm_struct *vm, size_t align); 271 272 int register_vmap_purge_notifier(struct notifier_block *nb); 273 int unregister_vmap_purge_notifier(struct notifier_block *nb); 274 275 #ifdef CONFIG_MMU 276 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 277 278 unsigned long vmalloc_nr_pages(void); 279 280 int vm_area_map_pages(struct vm_struct *area, unsigned long start, 281 unsigned long end, struct page **pages); 282 void vm_area_unmap_pages(struct vm_struct *area, unsigned long start, 283 unsigned long end); 284 void vunmap_range(unsigned long addr, unsigned long end); 285 286 static inline void set_vm_flush_reset_perms(void *addr) 287 { 288 struct vm_struct *vm = find_vm_area(addr); 289 290 if (vm) 291 vm->flags |= VM_FLUSH_RESET_PERMS; 292 } 293 #else /* !CONFIG_MMU */ 294 #define VMALLOC_TOTAL 0UL 295 296 static inline unsigned long vmalloc_nr_pages(void) { return 0; } 297 static inline void set_vm_flush_reset_perms(void *addr) {} 298 #endif /* CONFIG_MMU */ 299 300 #if defined(CONFIG_MMU) && defined(CONFIG_SMP) 301 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 302 const size_t *sizes, int nr_vms, 303 size_t align); 304 305 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 306 # else 307 static inline struct vm_struct ** 308 pcpu_get_vm_areas(const unsigned long *offsets, 309 const size_t *sizes, int nr_vms, 310 size_t align) 311 { 312 return NULL; 313 } 314 315 static inline void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) {} 316 #endif 317 318 #if defined(CONFIG_MMU) && defined(CONFIG_PRINTK) 319 bool vmalloc_dump_obj(void *object); 320 #else 321 static inline bool vmalloc_dump_obj(void *object) { return false; } 322 #endif 323 324 #endif /* _LINUX_VMALLOC_H */ 325