1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_VMALLOC_H 3 #define _LINUX_VMALLOC_H 4 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> 12 13 #include <asm/vmalloc.h> 14 15 struct vm_area_struct; /* vma defining user mapping in mm_types.h */ 16 struct notifier_block; /* in notifier.h */ 17 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 */ 30 31 /* 32 * VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLOC. 33 * 34 * If IS_ENABLED(CONFIG_KASAN_VMALLOC), VM_KASAN is set on a vm_struct after 35 * shadow memory has been mapped. It's used to handle allocation errors so that 36 * we don't try to poison shadow on free if it was never allocated. 37 * 38 * Otherwise, VM_KASAN is set for kasan_module_alloc() allocations and used to 39 * determine which allocations need the module shadow freed. 40 */ 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 vmap_area_root) 77 * 2) or "busy" tree (root is free_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 }; 84 85 /* archs that select HAVE_ARCH_HUGE_VMAP should override one or more of these */ 86 #ifndef arch_vmap_p4d_supported 87 static inline bool arch_vmap_p4d_supported(pgprot_t prot) 88 { 89 return false; 90 } 91 #endif 92 93 #ifndef arch_vmap_pud_supported 94 static inline bool arch_vmap_pud_supported(pgprot_t prot) 95 { 96 return false; 97 } 98 #endif 99 100 #ifndef arch_vmap_pmd_supported 101 static inline bool arch_vmap_pmd_supported(pgprot_t prot) 102 { 103 return false; 104 } 105 #endif 106 107 /* 108 * Highlevel APIs for driver use 109 */ 110 extern void vm_unmap_ram(const void *mem, unsigned int count); 111 extern void *vm_map_ram(struct page **pages, unsigned int count, int node); 112 extern void vm_unmap_aliases(void); 113 114 #ifdef CONFIG_MMU 115 extern void __init vmalloc_init(void); 116 extern unsigned long vmalloc_nr_pages(void); 117 #else 118 static inline void vmalloc_init(void) 119 { 120 } 121 static inline unsigned long vmalloc_nr_pages(void) { return 0; } 122 #endif 123 124 extern void *vmalloc(unsigned long size); 125 extern void *vzalloc(unsigned long size); 126 extern void *vmalloc_user(unsigned long size); 127 extern void *vmalloc_node(unsigned long size, int node); 128 extern void *vzalloc_node(unsigned long size, int node); 129 extern void *vmalloc_32(unsigned long size); 130 extern void *vmalloc_32_user(unsigned long size); 131 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask); 132 extern void *__vmalloc_node_range(unsigned long size, unsigned long align, 133 unsigned long start, unsigned long end, gfp_t gfp_mask, 134 pgprot_t prot, unsigned long vm_flags, int node, 135 const void *caller); 136 void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask, 137 int node, const void *caller); 138 139 extern void vfree(const void *addr); 140 extern void vfree_atomic(const void *addr); 141 142 extern void *vmap(struct page **pages, unsigned int count, 143 unsigned long flags, pgprot_t prot); 144 void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot); 145 extern void vunmap(const void *addr); 146 147 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, 148 unsigned long uaddr, void *kaddr, 149 unsigned long pgoff, unsigned long size); 150 151 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, 152 unsigned long pgoff); 153 154 /* 155 * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values 156 * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings() 157 * needs to be called. 158 */ 159 #ifndef ARCH_PAGE_TABLE_SYNC_MASK 160 #define ARCH_PAGE_TABLE_SYNC_MASK 0 161 #endif 162 163 /* 164 * There is no default implementation for arch_sync_kernel_mappings(). It is 165 * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK 166 * is 0. 167 */ 168 void arch_sync_kernel_mappings(unsigned long start, unsigned long end); 169 170 /* 171 * Lowlevel-APIs (not for driver use!) 172 */ 173 174 static inline size_t get_vm_area_size(const struct vm_struct *area) 175 { 176 if (!(area->flags & VM_NO_GUARD)) 177 /* return actual size without guard page */ 178 return area->size - PAGE_SIZE; 179 else 180 return area->size; 181 182 } 183 184 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags); 185 extern struct vm_struct *get_vm_area_caller(unsigned long size, 186 unsigned long flags, const void *caller); 187 extern struct vm_struct *__get_vm_area_caller(unsigned long size, 188 unsigned long flags, 189 unsigned long start, unsigned long end, 190 const void *caller); 191 void free_vm_area(struct vm_struct *area); 192 extern struct vm_struct *remove_vm_area(const void *addr); 193 extern struct vm_struct *find_vm_area(const void *addr); 194 195 static inline bool is_vm_area_hugepages(const void *addr) 196 { 197 /* 198 * This may not 100% tell if the area is mapped with > PAGE_SIZE 199 * page table entries, if for some reason the architecture indicates 200 * larger sizes are available but decides not to use them, nothing 201 * prevents that. This only indicates the size of the physical page 202 * allocated in the vmalloc layer. 203 */ 204 #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC 205 return find_vm_area(addr)->page_order > 0; 206 #else 207 return false; 208 #endif 209 } 210 211 #ifdef CONFIG_MMU 212 int vmap_range(unsigned long addr, unsigned long end, 213 phys_addr_t phys_addr, pgprot_t prot, 214 unsigned int max_page_shift); 215 void vunmap_range(unsigned long addr, unsigned long end); 216 static inline void set_vm_flush_reset_perms(void *addr) 217 { 218 struct vm_struct *vm = find_vm_area(addr); 219 220 if (vm) 221 vm->flags |= VM_FLUSH_RESET_PERMS; 222 } 223 224 #else 225 static inline void set_vm_flush_reset_perms(void *addr) 226 { 227 } 228 #endif 229 230 /* for /proc/kcore */ 231 extern long vread(char *buf, char *addr, unsigned long count); 232 233 /* 234 * Internals. Dont't use.. 235 */ 236 extern struct list_head vmap_area_list; 237 extern __init void vm_area_add_early(struct vm_struct *vm); 238 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align); 239 240 #ifdef CONFIG_SMP 241 # ifdef CONFIG_MMU 242 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets, 243 const size_t *sizes, int nr_vms, 244 size_t align); 245 246 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms); 247 # else 248 static inline struct vm_struct ** 249 pcpu_get_vm_areas(const unsigned long *offsets, 250 const size_t *sizes, int nr_vms, 251 size_t align) 252 { 253 return NULL; 254 } 255 256 static inline void 257 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) 258 { 259 } 260 # endif 261 #endif 262 263 #ifdef CONFIG_MMU 264 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) 265 #else 266 #define VMALLOC_TOTAL 0UL 267 #endif 268 269 int register_vmap_purge_notifier(struct notifier_block *nb); 270 int unregister_vmap_purge_notifier(struct notifier_block *nb); 271 272 #if defined(CONFIG_MMU) && defined(CONFIG_PRINTK) 273 bool vmalloc_dump_obj(void *object); 274 #else 275 static inline bool vmalloc_dump_obj(void *object) { return false; } 276 #endif 277 278 #endif /* _LINUX_VMALLOC_H */ 279