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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef _LINUX_VMALLOC_H
- #define _LINUX_VMALLOC_H
- #include <linux/spinlock.h>
- #include <linux/init.h>
- #include <linux/list.h>
- #include <linux/llist.h>
- #include <asm/page.h> /* pgprot_t */
- #include <linux/rbtree.h>
- #include <linux/overflow.h>
- #include <linux/android_vendor.h>
- #include <asm/vmalloc.h>
- struct vm_area_struct; /* vma defining user mapping in mm_types.h */
- struct notifier_block; /* in notifier.h */
- /* bits in flags of vmalloc's vm_struct below */
- #define VM_IOREMAP 0x00000001 /* ioremap() and friends */
- #define VM_ALLOC 0x00000002 /* vmalloc() */
- #define VM_MAP 0x00000004 /* vmap()ed pages */
- #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
- #define VM_DMA_COHERENT 0x00000010 /* dma_alloc_coherent */
- #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
- #define VM_NO_GUARD 0x00000040 /* don't add guard page */
- #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
- #define VM_FLUSH_RESET_PERMS 0x00000100 /* reset direct map and flush TLB on unmap, can't be freed in atomic context */
- #define VM_MAP_PUT_PAGES 0x00000200 /* put pages and free array in vfree */
- /*
- * VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLOC.
- *
- * If IS_ENABLED(CONFIG_KASAN_VMALLOC), VM_KASAN is set on a vm_struct after
- * shadow memory has been mapped. It's used to handle allocation errors so that
- * we don't try to poision shadow on free if it was never allocated.
- *
- * Otherwise, VM_KASAN is set for kasan_module_alloc() allocations and used to
- * determine which allocations need the module shadow freed.
- */
- /* bits [20..32] reserved for arch specific ioremap internals */
- /*
- * Maximum alignment for ioremap() regions.
- * Can be overriden by arch-specific value.
- */
- #ifndef IOREMAP_MAX_ORDER
- #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
- #endif
- struct vm_struct {
- struct vm_struct *next;
- void *addr;
- unsigned long size;
- unsigned long flags;
- struct page **pages;
- unsigned int nr_pages;
- phys_addr_t phys_addr;
- const void *caller;
- ANDROID_OEM_DATA(1);
- };
- struct vmap_area {
- unsigned long va_start;
- unsigned long va_end;
- struct rb_node rb_node; /* address sorted rbtree */
- struct list_head list; /* address sorted list */
- /*
- * The following three variables can be packed, because
- * a vmap_area object is always one of the three states:
- * 1) in "free" tree (root is vmap_area_root)
- * 2) in "busy" tree (root is free_vmap_area_root)
- * 3) in purge list (head is vmap_purge_list)
- */
- union {
- unsigned long subtree_max_size; /* in "free" tree */
- struct vm_struct *vm; /* in "busy" tree */
- struct llist_node purge_list; /* in purge list */
- };
- };
- /*
- * Highlevel APIs for driver use
- */
- extern void vm_unmap_ram(const void *mem, unsigned int count);
- extern void *vm_map_ram(struct page **pages, unsigned int count, int node);
- extern void vm_unmap_aliases(void);
- #ifdef CONFIG_MMU
- extern void __init vmalloc_init(void);
- extern unsigned long vmalloc_nr_pages(void);
- #else
- static inline void vmalloc_init(void)
- {
- }
- static inline unsigned long vmalloc_nr_pages(void) { return 0; }
- #endif
- extern void *vmalloc(unsigned long size);
- extern void *vzalloc(unsigned long size);
- extern void *vmalloc_user(unsigned long size);
- extern void *vmalloc_node(unsigned long size, int node);
- extern void *vzalloc_node(unsigned long size, int node);
- extern void *vmalloc_32(unsigned long size);
- extern void *vmalloc_32_user(unsigned long size);
- extern void *__vmalloc(unsigned long size, gfp_t gfp_mask);
- extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
- unsigned long start, unsigned long end, gfp_t gfp_mask,
- pgprot_t prot, unsigned long vm_flags, int node,
- const void *caller);
- void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask,
- int node, const void *caller);
- extern void vfree(const void *addr);
- extern void vfree_atomic(const void *addr);
- extern void *vmap(struct page **pages, unsigned int count,
- unsigned long flags, pgprot_t prot);
- void *vmap_pfn(unsigned long *pfns, unsigned int count, pgprot_t prot);
- extern void vunmap(const void *addr);
- extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
- unsigned long uaddr, void *kaddr,
- unsigned long pgoff, unsigned long size);
- extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
- unsigned long pgoff);
- /*
- * Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values
- * and let generic vmalloc and ioremap code know when arch_sync_kernel_mappings()
- * needs to be called.
- */
- #ifndef ARCH_PAGE_TABLE_SYNC_MASK
- #define ARCH_PAGE_TABLE_SYNC_MASK 0
- #endif
- /*
- * There is no default implementation for arch_sync_kernel_mappings(). It is
- * relied upon the compiler to optimize calls out if ARCH_PAGE_TABLE_SYNC_MASK
- * is 0.
- */
- void arch_sync_kernel_mappings(unsigned long start, unsigned long end);
- /*
- * Lowlevel-APIs (not for driver use!)
- */
- static inline size_t get_vm_area_size(const struct vm_struct *area)
- {
- if (!(area->flags & VM_NO_GUARD))
- /* return actual size without guard page */
- return area->size - PAGE_SIZE;
- else
- return area->size;
- }
- extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
- extern struct vm_struct *get_vm_area_caller(unsigned long size,
- unsigned long flags, const void *caller);
- extern struct vm_struct *__get_vm_area_caller(unsigned long size,
- unsigned long flags,
- unsigned long start, unsigned long end,
- const void *caller);
- void free_vm_area(struct vm_struct *area);
- extern struct vm_struct *remove_vm_area(const void *addr);
- extern struct vm_struct *find_vm_area(const void *addr);
- #ifdef CONFIG_MMU
- extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
- pgprot_t prot, struct page **pages);
- int map_kernel_range(unsigned long start, unsigned long size, pgprot_t prot,
- struct page **pages);
- extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
- extern void unmap_kernel_range(unsigned long addr, unsigned long size);
- static inline void set_vm_flush_reset_perms(void *addr)
- {
- struct vm_struct *vm = find_vm_area(addr);
- if (vm)
- vm->flags |= VM_FLUSH_RESET_PERMS;
- }
- #else
- static inline int
- map_kernel_range_noflush(unsigned long start, unsigned long size,
- pgprot_t prot, struct page **pages)
- {
- return size >> PAGE_SHIFT;
- }
- #define map_kernel_range map_kernel_range_noflush
- static inline void
- unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
- {
- }
- #define unmap_kernel_range unmap_kernel_range_noflush
- static inline void set_vm_flush_reset_perms(void *addr)
- {
- }
- #endif
- /* for /dev/kmem */
- extern long vread(char *buf, char *addr, unsigned long count);
- extern long vwrite(char *buf, char *addr, unsigned long count);
- /*
- * Internals. Dont't use..
- */
- extern struct list_head vmap_area_list;
- extern __init void vm_area_add_early(struct vm_struct *vm);
- extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
- #ifdef CONFIG_SMP
- # ifdef CONFIG_MMU
- struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
- const size_t *sizes, int nr_vms,
- size_t align);
- void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
- # else
- static inline struct vm_struct **
- pcpu_get_vm_areas(const unsigned long *offsets,
- const size_t *sizes, int nr_vms,
- size_t align)
- {
- return NULL;
- }
- static inline void
- pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
- {
- }
- # endif
- #endif
- #ifdef CONFIG_MMU
- #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
- #else
- #define VMALLOC_TOTAL 0UL
- #endif
- int register_vmap_purge_notifier(struct notifier_block *nb);
- int unregister_vmap_purge_notifier(struct notifier_block *nb);
- #endif /* _LINUX_VMALLOC_H */
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