root/include/linux/vmalloc.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. vmalloc_init
  2. get_vm_area_size
  3. map_kernel_range_noflush
  4. unmap_kernel_range_noflush
  5. unmap_kernel_range
  6. pcpu_get_vm_areas
  7. pcpu_free_vm_areas

#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 */
/* 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, 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)
{
        /* return actual size without guard page */
        return area->size - PAGE_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 */

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