diff options
Diffstat (limited to 'kernel/include/linux/vmalloc.h')
| -rw-r--r-- | kernel/include/linux/vmalloc.h | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/kernel/include/linux/vmalloc.h b/kernel/include/linux/vmalloc.h new file mode 100644 index 000000000..0ec598381 --- /dev/null +++ b/kernel/include/linux/vmalloc.h @@ -0,0 +1,203 @@ +#ifndef _LINUX_VMALLOC_H +#define _LINUX_VMALLOC_H + +#include <linux/spinlock.h> +#include <linux/init.h> +#include <linux/list.h> +#include <asm/page.h> /* pgprot_t */ +#include <linux/rbtree.h> + +struct vm_area_struct; /* vma defining user mapping in mm_types.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_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */ +#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 list_head 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); +#else +static inline void vmalloc_init(void) +{ +} +#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); + +extern void vfree(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 + +struct vmalloc_info { + unsigned long used; + unsigned long largest_chunk; +}; + +#ifdef CONFIG_MMU +#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START) +extern void get_vmalloc_info(struct vmalloc_info *vmi); +#else + +#define VMALLOC_TOTAL 0UL +#define get_vmalloc_info(vmi) \ +do { \ + (vmi)->used = 0; \ + (vmi)->largest_chunk = 0; \ +} while (0) +#endif + +#endif /* _LINUX_VMALLOC_H */ |