include/linux/vmalloc.h

   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 int vmap_pages_range(unsigned long addr, unsigned long end, pgprot_t prot,
 206                      struct page **pages, unsigned int page_shift);
 207
 208 /*
 209  * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values
 210  * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings()
 211  * needs to be called.
 212  */
 213 #ifndef ARCH_PAGE_TABLE_SYNC_MASK
 214 #define ARCH_PAGE_TABLE_SYNC_MASK 0
 215 #endif
 216
 217 /*
 218  * There is no default implementation for arch_sync_kernel_mappings(). It is
 219  * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK
 220  * is 0.
 221  */
 222 void arch_sync_kernel_mappings(unsigned long start, unsigned long end);
 223
 224 /*
 225  *      Lowlevel-APIs (not for driver use!)
 226  */
 227
 228 static inline size_t get_vm_area_size(const struct vm_struct *area)
 229 {
 230         if (!(area->flags & VM_NO_GUARD))
 231                 /* return actual size without guard page */
 232                 return area->size - PAGE_SIZE;
 233         else
 234                 return area->size;
 235
 236 }
 237
 238 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
 239 extern struct vm_struct *get_vm_area_caller(unsigned long size,
 240                                         unsigned long flags, const void *caller);
 241 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
 242                                         unsigned long flags,
 243                                         unsigned long start, unsigned long end,
 244                                         const void *caller);
 245 void free_vm_area(struct vm_struct *area);
 246 extern struct vm_struct *remove_vm_area(const void *addr);
 247 extern struct vm_struct *find_vm_area(const void *addr);
 248 struct vmap_area *find_vmap_area(unsigned long addr);
 249
 250 static inline bool is_vm_area_hugepages(const void *addr)
 251 {
 252         /*
 253          * This may not 100% tell if the area is mapped with > PAGE_SIZE
 254          * page table entries, if for some reason the architecture indicates
 255          * larger sizes are available but decides not to use them, nothing
 256          * prevents that. This only indicates the size of the physical page
 257          * allocated in the vmalloc layer.
 258          */
 259 #ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC
 260         return find_vm_area(addr)->page_order > 0;
 261 #else
 262         return false;
 263 #endif
 264 }
 265
 266 /* for /proc/kcore */
 267 long vread_iter(struct iov_iter *iter, const char *addr, size_t count);
 268
 269 /*
 270  *      Internals.  Don't use..
 271  */
 272 __init void vm_area_add_early(struct vm_struct *vm);
 273 __init void vm_area_register_early(struct vm_struct *vm, size_t align);
 274
 275 int register_vmap_purge_notifier(struct notifier_block *nb);
 276 int unregister_vmap_purge_notifier(struct notifier_block *nb);
 277
 278 #ifdef CONFIG_MMU
 279 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
 280
 281 unsigned long vmalloc_nr_pages(void);
 282
 283 int vm_area_map_pages(struct vm_struct *area, unsigned long start,
 284                       unsigned long end, struct page **pages);
 285 void vm_area_unmap_pages(struct vm_struct *area, unsigned long start,
 286                          unsigned long end);
 287 void vunmap_range(unsigned long addr, unsigned long end);
 288
 289 static inline void set_vm_flush_reset_perms(void *addr)
 290 {
 291         struct vm_struct *vm = find_vm_area(addr);
 292
 293         if (vm)
 294                 vm->flags |= VM_FLUSH_RESET_PERMS;
 295 }
 296 #else  /* !CONFIG_MMU */
 297 #define VMALLOC_TOTAL 0UL
 298
 299 static inline unsigned long vmalloc_nr_pages(void) { return 0; }
 300 static inline void set_vm_flush_reset_perms(void *addr) {}
 301 #endif /* CONFIG_MMU */
 302
 303 #if defined(CONFIG_MMU) && defined(CONFIG_SMP)
 304 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 305                                      const size_t *sizes, int nr_vms,
 306                                      size_t align);
 307
 308 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
 309 # else
 310 static inline struct vm_struct **
 311 pcpu_get_vm_areas(const unsigned long *offsets,
 312                 const size_t *sizes, int nr_vms,
 313                 size_t align)
 314 {
 315         return NULL;
 316 }
 317
 318 static inline void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) {}
 319 #endif
 320
 321 #if defined(CONFIG_MMU) && defined(CONFIG_PRINTK)
 322 bool vmalloc_dump_obj(void *object);
 323 #else
 324 static inline bool vmalloc_dump_obj(void *object) { return false; }
 325 #endif
 326
 327 #endif /* _LINUX_VMALLOC_H */