499 строки
13 KiB
C
499 строки
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_HUGE_MM_H
|
|
#define _LINUX_HUGE_MM_H
|
|
|
|
#include <linux/sched/coredump.h>
|
|
#include <linux/mm_types.h>
|
|
|
|
#include <linux/fs.h> /* only for vma_is_dax() */
|
|
|
|
vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
|
|
int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
|
|
pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
|
|
struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma);
|
|
void huge_pmd_set_accessed(struct vm_fault *vmf);
|
|
int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
|
|
pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
|
|
struct vm_area_struct *vma);
|
|
|
|
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
|
|
void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
|
|
#else
|
|
static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf);
|
|
struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
|
|
unsigned long addr, pmd_t *pmd,
|
|
unsigned int flags);
|
|
bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
|
|
pmd_t *pmd, unsigned long addr, unsigned long next);
|
|
int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd,
|
|
unsigned long addr);
|
|
int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud,
|
|
unsigned long addr);
|
|
bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
|
|
unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd);
|
|
int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr,
|
|
pgprot_t newprot, unsigned long cp_flags);
|
|
vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn,
|
|
pgprot_t pgprot, bool write);
|
|
|
|
/**
|
|
* vmf_insert_pfn_pmd - insert a pmd size pfn
|
|
* @vmf: Structure describing the fault
|
|
* @pfn: pfn to insert
|
|
* @pgprot: page protection to use
|
|
* @write: whether it's a write fault
|
|
*
|
|
* Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
|
|
*
|
|
* Return: vm_fault_t value.
|
|
*/
|
|
static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn,
|
|
bool write)
|
|
{
|
|
return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
|
|
}
|
|
vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn,
|
|
pgprot_t pgprot, bool write);
|
|
|
|
/**
|
|
* vmf_insert_pfn_pud - insert a pud size pfn
|
|
* @vmf: Structure describing the fault
|
|
* @pfn: pfn to insert
|
|
* @pgprot: page protection to use
|
|
* @write: whether it's a write fault
|
|
*
|
|
* Insert a pud size pfn. See vmf_insert_pfn() for additional info.
|
|
*
|
|
* Return: vm_fault_t value.
|
|
*/
|
|
static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
|
|
bool write)
|
|
{
|
|
return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
|
|
}
|
|
|
|
enum transparent_hugepage_flag {
|
|
TRANSPARENT_HUGEPAGE_NEVER_DAX,
|
|
TRANSPARENT_HUGEPAGE_FLAG,
|
|
TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
|
|
TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
|
|
TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
|
|
TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
|
|
TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
|
|
TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
|
|
TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
|
|
};
|
|
|
|
struct kobject;
|
|
struct kobj_attribute;
|
|
|
|
ssize_t single_hugepage_flag_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t count,
|
|
enum transparent_hugepage_flag flag);
|
|
ssize_t single_hugepage_flag_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf,
|
|
enum transparent_hugepage_flag flag);
|
|
extern struct kobj_attribute shmem_enabled_attr;
|
|
|
|
#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
|
|
#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
#define HPAGE_PMD_SHIFT PMD_SHIFT
|
|
#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
|
|
#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
|
|
|
|
#define HPAGE_PUD_SHIFT PUD_SHIFT
|
|
#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
|
|
#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
|
|
|
|
extern unsigned long transparent_hugepage_flags;
|
|
|
|
static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
|
|
unsigned long haddr)
|
|
{
|
|
/* Don't have to check pgoff for anonymous vma */
|
|
if (!vma_is_anonymous(vma)) {
|
|
if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
|
|
HPAGE_PMD_NR))
|
|
return false;
|
|
}
|
|
|
|
if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
|
|
unsigned long vm_flags)
|
|
{
|
|
/* Explicitly disabled through madvise. */
|
|
if ((vm_flags & VM_NOHUGEPAGE) ||
|
|
test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* to be used on vmas which are known to support THP.
|
|
* Use transparent_hugepage_active otherwise
|
|
*/
|
|
static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
|
|
{
|
|
|
|
/*
|
|
* If the hardware/firmware marked hugepage support disabled.
|
|
*/
|
|
if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_NEVER_DAX))
|
|
return false;
|
|
|
|
if (!transhuge_vma_enabled(vma, vma->vm_flags))
|
|
return false;
|
|
|
|
if (vma_is_temporary_stack(vma))
|
|
return false;
|
|
|
|
if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
|
|
return true;
|
|
|
|
if (vma_is_dax(vma))
|
|
return true;
|
|
|
|
if (transparent_hugepage_flags &
|
|
(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
|
|
return !!(vma->vm_flags & VM_HUGEPAGE);
|
|
|
|
return false;
|
|
}
|
|
|
|
bool transparent_hugepage_active(struct vm_area_struct *vma);
|
|
|
|
#define transparent_hugepage_use_zero_page() \
|
|
(transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
|
|
|
|
unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff, unsigned long flags);
|
|
|
|
void prep_transhuge_page(struct page *page);
|
|
void free_transhuge_page(struct page *page);
|
|
bool is_transparent_hugepage(struct page *page);
|
|
|
|
bool can_split_huge_page(struct page *page, int *pextra_pins);
|
|
int split_huge_page_to_list(struct page *page, struct list_head *list);
|
|
static inline int split_huge_page(struct page *page)
|
|
{
|
|
return split_huge_page_to_list(page, NULL);
|
|
}
|
|
void deferred_split_huge_page(struct page *page);
|
|
|
|
void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
|
|
unsigned long address, bool freeze, struct page *page);
|
|
|
|
#define split_huge_pmd(__vma, __pmd, __address) \
|
|
do { \
|
|
pmd_t *____pmd = (__pmd); \
|
|
if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
|
|
|| pmd_devmap(*____pmd)) \
|
|
__split_huge_pmd(__vma, __pmd, __address, \
|
|
false, NULL); \
|
|
} while (0)
|
|
|
|
|
|
void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
|
|
bool freeze, struct page *page);
|
|
|
|
void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
|
|
unsigned long address);
|
|
|
|
#define split_huge_pud(__vma, __pud, __address) \
|
|
do { \
|
|
pud_t *____pud = (__pud); \
|
|
if (pud_trans_huge(*____pud) \
|
|
|| pud_devmap(*____pud)) \
|
|
__split_huge_pud(__vma, __pud, __address); \
|
|
} while (0)
|
|
|
|
int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags,
|
|
int advice);
|
|
void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
|
|
unsigned long end, long adjust_next);
|
|
spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
|
|
spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma);
|
|
|
|
static inline int is_swap_pmd(pmd_t pmd)
|
|
{
|
|
return !pmd_none(pmd) && !pmd_present(pmd);
|
|
}
|
|
|
|
/* mmap_lock must be held on entry */
|
|
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
|
|
return __pmd_trans_huge_lock(pmd, vma);
|
|
else
|
|
return NULL;
|
|
}
|
|
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
if (pud_trans_huge(*pud) || pud_devmap(*pud))
|
|
return __pud_trans_huge_lock(pud, vma);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* thp_head - Head page of a transparent huge page.
|
|
* @page: Any page (tail, head or regular) found in the page cache.
|
|
*/
|
|
static inline struct page *thp_head(struct page *page)
|
|
{
|
|
return compound_head(page);
|
|
}
|
|
|
|
/**
|
|
* thp_order - Order of a transparent huge page.
|
|
* @page: Head page of a transparent huge page.
|
|
*/
|
|
static inline unsigned int thp_order(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
if (PageHead(page))
|
|
return HPAGE_PMD_ORDER;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* thp_nr_pages - The number of regular pages in this huge page.
|
|
* @page: The head page of a huge page.
|
|
*/
|
|
static inline int thp_nr_pages(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
if (PageHead(page))
|
|
return HPAGE_PMD_NR;
|
|
return 1;
|
|
}
|
|
|
|
struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
|
|
pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
|
|
struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
|
|
pud_t *pud, int flags, struct dev_pagemap **pgmap);
|
|
|
|
vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);
|
|
|
|
extern struct page *huge_zero_page;
|
|
extern unsigned long huge_zero_pfn;
|
|
|
|
static inline bool is_huge_zero_page(struct page *page)
|
|
{
|
|
return READ_ONCE(huge_zero_page) == page;
|
|
}
|
|
|
|
static inline bool is_huge_zero_pmd(pmd_t pmd)
|
|
{
|
|
return READ_ONCE(huge_zero_pfn) == pmd_pfn(pmd) && pmd_present(pmd);
|
|
}
|
|
|
|
static inline bool is_huge_zero_pud(pud_t pud)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
struct page *mm_get_huge_zero_page(struct mm_struct *mm);
|
|
void mm_put_huge_zero_page(struct mm_struct *mm);
|
|
|
|
#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
|
|
|
|
static inline bool thp_migration_supported(void)
|
|
{
|
|
return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
|
|
}
|
|
|
|
static inline struct list_head *page_deferred_list(struct page *page)
|
|
{
|
|
/*
|
|
* Global or memcg deferred list in the second tail pages is
|
|
* occupied by compound_head.
|
|
*/
|
|
return &page[2].deferred_list;
|
|
}
|
|
|
|
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
|
|
|
|
#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
|
|
#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
|
|
|
|
static inline struct page *thp_head(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
return page;
|
|
}
|
|
|
|
static inline unsigned int thp_order(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
return 0;
|
|
}
|
|
|
|
static inline int thp_nr_pages(struct page *page)
|
|
{
|
|
VM_BUG_ON_PGFLAGS(PageTail(page), page);
|
|
return 1;
|
|
}
|
|
|
|
static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool transparent_hugepage_active(struct vm_area_struct *vma)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
|
|
unsigned long haddr)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool transhuge_vma_enabled(struct vm_area_struct *vma,
|
|
unsigned long vm_flags)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void prep_transhuge_page(struct page *page) {}
|
|
|
|
static inline bool is_transparent_hugepage(struct page *page)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#define transparent_hugepage_flags 0UL
|
|
|
|
#define thp_get_unmapped_area NULL
|
|
|
|
static inline bool
|
|
can_split_huge_page(struct page *page, int *pextra_pins)
|
|
{
|
|
BUILD_BUG();
|
|
return false;
|
|
}
|
|
static inline int
|
|
split_huge_page_to_list(struct page *page, struct list_head *list)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int split_huge_page(struct page *page)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void deferred_split_huge_page(struct page *page) {}
|
|
#define split_huge_pmd(__vma, __pmd, __address) \
|
|
do { } while (0)
|
|
|
|
static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
|
|
unsigned long address, bool freeze, struct page *page) {}
|
|
static inline void split_huge_pmd_address(struct vm_area_struct *vma,
|
|
unsigned long address, bool freeze, struct page *page) {}
|
|
|
|
#define split_huge_pud(__vma, __pmd, __address) \
|
|
do { } while (0)
|
|
|
|
static inline int hugepage_madvise(struct vm_area_struct *vma,
|
|
unsigned long *vm_flags, int advice)
|
|
{
|
|
BUG();
|
|
return 0;
|
|
}
|
|
static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
|
|
unsigned long start,
|
|
unsigned long end,
|
|
long adjust_next)
|
|
{
|
|
}
|
|
static inline int is_swap_pmd(pmd_t pmd)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline bool is_huge_zero_page(struct page *page)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_huge_zero_pmd(pmd_t pmd)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_huge_zero_pud(pud_t pud)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void mm_put_huge_zero_page(struct mm_struct *mm)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
|
|
unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
|
|
unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline bool thp_migration_supported(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
/**
|
|
* thp_size - Size of a transparent huge page.
|
|
* @page: Head page of a transparent huge page.
|
|
*
|
|
* Return: Number of bytes in this page.
|
|
*/
|
|
static inline unsigned long thp_size(struct page *page)
|
|
{
|
|
return PAGE_SIZE << thp_order(page);
|
|
}
|
|
|
|
#endif /* _LINUX_HUGE_MM_H */
|