| /* 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> |
| |
| 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_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 */ |
| /* 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; |
| }; |
| |
| struct vmap_area { |
| unsigned long va_start; |
| unsigned long va_end; |
| unsigned long flags; |
| struct rb_node rb_node; /* address sorted rbtree */ |
| struct list_head list; /* address sorted list */ |
| struct llist_node purge_list; /* "lazy purge" list */ |
| struct vm_struct *vm; |
| struct rcu_head rcu_head; |
| }; |
| |
| /* |
| * 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, pgprot_t prot); |
| 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_exec(unsigned long size); |
| 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, pgprot_t prot); |
| 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); |
| #ifndef CONFIG_MMU |
| extern void *__vmalloc_node_flags(unsigned long size, int node, gfp_t flags); |
| static inline void *__vmalloc_node_flags_caller(unsigned long size, int node, |
| gfp_t flags, void *caller) |
| { |
| return __vmalloc_node_flags(size, node, flags); |
| } |
| #else |
| extern void *__vmalloc_node_flags_caller(unsigned long size, |
| int node, gfp_t flags, void *caller); |
| #endif |
| |
| 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); |
| extern void vunmap(const void *addr); |
| |
| extern int remap_vmalloc_range_partial(struct vm_area_struct *vma, |
| unsigned long uaddr, void *kaddr, |
| unsigned long size); |
| |
| extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, |
| unsigned long pgoff); |
| void vmalloc_sync_all(void); |
| |
| /* |
| * 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(unsigned long size, unsigned long flags, |
| unsigned long start, unsigned long end); |
| extern struct vm_struct *__get_vm_area_caller(unsigned long size, |
| unsigned long flags, |
| unsigned long start, unsigned long end, |
| const void *caller); |
| extern struct vm_struct *remove_vm_area(const void *addr); |
| extern struct vm_struct *find_vm_area(const void *addr); |
| |
| extern int map_vm_area(struct vm_struct *area, pgprot_t prot, |
| struct page **pages); |
| #ifdef CONFIG_MMU |
| extern int map_kernel_range_noflush(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); |
| #else |
| static inline int |
| map_kernel_range_noflush(unsigned long start, unsigned long size, |
| pgprot_t prot, struct page **pages) |
| { |
| return size >> PAGE_SHIFT; |
| } |
| static inline void |
| unmap_kernel_range_noflush(unsigned long addr, unsigned long size) |
| { |
| } |
| static inline void |
| unmap_kernel_range(unsigned long addr, unsigned long size) |
| { |
| } |
| #endif |
| |
| /* Allocate/destroy a 'vmalloc' VM area. */ |
| extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes); |
| extern void free_vm_area(struct vm_struct *area); |
| |
| /* 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 */ |