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Diffstat (limited to 'include/linux/vmalloc.h')
| -rw-r--r-- | include/linux/vmalloc.h | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h new file mode 100644 index 000000000..096d48aa3 --- /dev/null +++ b/include/linux/vmalloc.h @@ -0,0 +1,300 @@ +/* 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 <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 /* ***DANGEROUS*** 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 */ +#define VM_ALLOW_HUGE_VMAP 0x00000400 /* Allow for huge pages on archs with HAVE_ARCH_HUGE_VMALLOC */ + +#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \ + !defined(CONFIG_KASAN_VMALLOC) +#define VM_DEFER_KMEMLEAK 0x00000800 /* defer kmemleak object creation */ +#else +#define VM_DEFER_KMEMLEAK 0 +#endif + +/* bits [20..32] reserved for arch specific ioremap internals */ + +/* + * Maximum alignment for ioremap() regions. + * Can be overridden 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; +#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC + unsigned int page_order; +#endif + unsigned int nr_pages; + phys_addr_t phys_addr; + const void *caller; +}; + +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 two variables can be packed, because + * a vmap_area object can be either: + * 1) in "free" tree (root is free_vmap_area_root) + * 2) or "busy" tree (root is vmap_area_root) + */ + union { + unsigned long subtree_max_size; /* in "free" tree */ + struct vm_struct *vm; /* in "busy" tree */ + }; +}; + +/* archs that select HAVE_ARCH_HUGE_VMAP should override one or more of these */ +#ifndef arch_vmap_p4d_supported +static inline bool arch_vmap_p4d_supported(pgprot_t prot) +{ + return false; +} +#endif + +#ifndef arch_vmap_pud_supported +static inline bool arch_vmap_pud_supported(pgprot_t prot) +{ + return false; +} +#endif + +#ifndef arch_vmap_pmd_supported +static inline bool arch_vmap_pmd_supported(pgprot_t prot) +{ + return false; +} +#endif + +#ifndef arch_vmap_pte_range_map_size +static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr, unsigned long end, + u64 pfn, unsigned int max_page_shift) +{ + return PAGE_SIZE; +} +#endif + +#ifndef arch_vmap_pte_supported_shift +static inline int arch_vmap_pte_supported_shift(unsigned long size) +{ + return PAGE_SHIFT; +} +#endif + +#ifndef arch_vmap_pgprot_tagged +static inline pgprot_t arch_vmap_pgprot_tagged(pgprot_t prot) +{ + return prot; +} +#endif + +/* + * 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) __alloc_size(1); +extern void *vzalloc(unsigned long size) __alloc_size(1); +extern void *vmalloc_user(unsigned long size) __alloc_size(1); +extern void *vmalloc_node(unsigned long size, int node) __alloc_size(1); +extern void *vzalloc_node(unsigned long size, int node) __alloc_size(1); +extern void *vmalloc_32(unsigned long size) __alloc_size(1); +extern void *vmalloc_32_user(unsigned long size) __alloc_size(1); +extern void *__vmalloc(unsigned long size, gfp_t gfp_mask) __alloc_size(1); +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) __alloc_size(1); +void *__vmalloc_node(unsigned long size, unsigned long align, gfp_t gfp_mask, + int node, const void *caller) __alloc_size(1); +void *vmalloc_huge(unsigned long size, gfp_t gfp_mask) __alloc_size(1); + +extern void *__vmalloc_array(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2); +extern void *vmalloc_array(size_t n, size_t size) __alloc_size(1, 2); +extern void *__vcalloc(size_t n, size_t size, gfp_t flags) __alloc_size(1, 2); +extern void *vcalloc(size_t n, size_t size) __alloc_size(1, 2); + +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); +struct vmap_area *find_vmap_area(unsigned long addr); + +static inline bool is_vm_area_hugepages(const void *addr) +{ + /* + * This may not 100% tell if the area is mapped with > PAGE_SIZE + * page table entries, if for some reason the architecture indicates + * larger sizes are available but decides not to use them, nothing + * prevents that. This only indicates the size of the physical page + * allocated in the vmalloc layer. + */ +#ifdef CONFIG_HAVE_ARCH_HUGE_VMALLOC + return find_vm_area(addr)->page_order > 0; +#else + return false; +#endif +} + +#ifdef CONFIG_MMU +void vunmap_range(unsigned long addr, unsigned long end); +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 void set_vm_flush_reset_perms(void *addr) +{ +} +#endif + +/* for /proc/kcore */ +extern long vread(char *buf, char *addr, unsigned long count); + +/* + * Internals. Don'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); + +#if defined(CONFIG_MMU) && defined(CONFIG_PRINTK) +bool vmalloc_dump_obj(void *object); +#else +static inline bool vmalloc_dump_obj(void *object) { return false; } +#endif + +#endif /* _LINUX_VMALLOC_H */ |