454 lines
13 KiB
C
454 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_HUGE_MM_H
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#define _LINUX_HUGE_MM_H
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#include <linux/sched/coredump.h>
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#include <linux/mm_types.h>
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#include <linux/fs.h> /* only for vma_is_dax() */
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extern vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
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extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
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pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
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struct vm_area_struct *vma);
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extern void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
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extern int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
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pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
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struct vm_area_struct *vma);
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
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extern void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud);
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#else
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static inline void huge_pud_set_accessed(struct vm_fault *vmf, pud_t orig_pud)
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{
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}
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#endif
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extern vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd);
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extern struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
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unsigned long addr,
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pmd_t *pmd,
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unsigned int flags);
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extern bool madvise_free_huge_pmd(struct mmu_gather *tlb,
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struct vm_area_struct *vma,
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pmd_t *pmd, unsigned long addr, unsigned long next);
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extern int zap_huge_pmd(struct mmu_gather *tlb,
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struct vm_area_struct *vma,
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pmd_t *pmd, unsigned long addr);
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extern int zap_huge_pud(struct mmu_gather *tlb,
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struct vm_area_struct *vma,
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pud_t *pud, unsigned long addr);
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extern int mincore_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long addr, unsigned long end,
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unsigned char *vec);
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extern bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
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unsigned long new_addr, unsigned long old_end,
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pmd_t *old_pmd, pmd_t *new_pmd);
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extern int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long addr, pgprot_t newprot,
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unsigned long cp_flags);
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vm_fault_t vmf_insert_pfn_pmd_prot(struct vm_fault *vmf, pfn_t pfn,
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pgprot_t pgprot, bool write);
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/**
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* vmf_insert_pfn_pmd - insert a pmd size pfn
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* @vmf: Structure describing the fault
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* @pfn: pfn to insert
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* @pgprot: page protection to use
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* @write: whether it's a write fault
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*
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* Insert a pmd size pfn. See vmf_insert_pfn() for additional info.
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*
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* Return: vm_fault_t value.
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*/
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static inline vm_fault_t vmf_insert_pfn_pmd(struct vm_fault *vmf, pfn_t pfn,
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bool write)
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{
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return vmf_insert_pfn_pmd_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
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}
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vm_fault_t vmf_insert_pfn_pud_prot(struct vm_fault *vmf, pfn_t pfn,
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pgprot_t pgprot, bool write);
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/**
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* vmf_insert_pfn_pud - insert a pud size pfn
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* @vmf: Structure describing the fault
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* @pfn: pfn to insert
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* @pgprot: page protection to use
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* @write: whether it's a write fault
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*
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* Insert a pud size pfn. See vmf_insert_pfn() for additional info.
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*
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* Return: vm_fault_t value.
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*/
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static inline vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn,
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bool write)
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{
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return vmf_insert_pfn_pud_prot(vmf, pfn, vmf->vma->vm_page_prot, write);
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}
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enum transparent_hugepage_flag {
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TRANSPARENT_HUGEPAGE_FLAG,
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TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
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TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG,
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TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG,
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#ifdef CONFIG_DEBUG_VM
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TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG,
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#endif
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};
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struct kobject;
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struct kobj_attribute;
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extern ssize_t single_hugepage_flag_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t count,
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enum transparent_hugepage_flag flag);
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extern ssize_t single_hugepage_flag_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf,
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enum transparent_hugepage_flag flag);
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extern struct kobj_attribute shmem_enabled_attr;
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#define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
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#define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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#define HPAGE_PMD_SHIFT PMD_SHIFT
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#define HPAGE_PMD_SIZE ((1UL) << HPAGE_PMD_SHIFT)
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#define HPAGE_PMD_MASK (~(HPAGE_PMD_SIZE - 1))
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#define HPAGE_PUD_SHIFT PUD_SHIFT
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#define HPAGE_PUD_SIZE ((1UL) << HPAGE_PUD_SHIFT)
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#define HPAGE_PUD_MASK (~(HPAGE_PUD_SIZE - 1))
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extern unsigned long transparent_hugepage_flags;
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/*
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* to be used on vmas which are known to support THP.
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* Use transparent_hugepage_enabled otherwise
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*/
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static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
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{
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if (vma->vm_flags & VM_NOHUGEPAGE)
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return false;
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if (vma_is_temporary_stack(vma))
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return false;
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if (test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
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return false;
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if (transparent_hugepage_flags & (1 << TRANSPARENT_HUGEPAGE_FLAG))
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return true;
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/*
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* For dax vmas, try to always use hugepage mappings. If the kernel does
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* not support hugepages, fsdax mappings will fallback to PAGE_SIZE
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* mappings, and device-dax namespaces, that try to guarantee a given
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* mapping size, will fail to enable
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*/
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if (vma_is_dax(vma))
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return true;
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if (transparent_hugepage_flags &
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(1 << TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
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return !!(vma->vm_flags & VM_HUGEPAGE);
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return false;
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}
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bool transparent_hugepage_enabled(struct vm_area_struct *vma);
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#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
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static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
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unsigned long haddr)
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{
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/* Don't have to check pgoff for anonymous vma */
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if (!vma_is_anonymous(vma)) {
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if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
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(vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
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return false;
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}
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if (haddr < vma->vm_start || haddr + HPAGE_PMD_SIZE > vma->vm_end)
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return false;
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return true;
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}
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#define transparent_hugepage_use_zero_page() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_USE_ZERO_PAGE_FLAG))
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#ifdef CONFIG_DEBUG_VM
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#define transparent_hugepage_debug_cow() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_DEBUG_COW_FLAG))
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#else /* CONFIG_DEBUG_VM */
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#define transparent_hugepage_debug_cow() 0
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#endif /* CONFIG_DEBUG_VM */
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extern unsigned long thp_get_unmapped_area(struct file *filp,
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unsigned long addr, unsigned long len, unsigned long pgoff,
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unsigned long flags);
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extern void prep_transhuge_page(struct page *page);
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extern void free_transhuge_page(struct page *page);
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bool is_transparent_hugepage(struct page *page);
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bool can_split_huge_page(struct page *page, int *pextra_pins);
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int split_huge_page_to_list(struct page *page, struct list_head *list);
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static inline int split_huge_page(struct page *page)
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{
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return split_huge_page_to_list(page, NULL);
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}
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void deferred_split_huge_page(struct page *page);
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void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long address, bool freeze, struct page *page);
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#define split_huge_pmd(__vma, __pmd, __address) \
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do { \
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pmd_t *____pmd = (__pmd); \
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if (is_swap_pmd(*____pmd) || pmd_trans_huge(*____pmd) \
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|| pmd_devmap(*____pmd)) \
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__split_huge_pmd(__vma, __pmd, __address, \
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false, NULL); \
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} while (0)
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void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address,
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bool freeze, struct page *page);
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void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud,
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unsigned long address);
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#define split_huge_pud(__vma, __pud, __address) \
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do { \
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pud_t *____pud = (__pud); \
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if (pud_trans_huge(*____pud) \
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|| pud_devmap(*____pud)) \
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__split_huge_pud(__vma, __pud, __address); \
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} while (0)
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extern int hugepage_madvise(struct vm_area_struct *vma,
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unsigned long *vm_flags, int advice);
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extern void vma_adjust_trans_huge(struct vm_area_struct *vma,
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unsigned long start,
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unsigned long end,
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long adjust_next);
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extern spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd,
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struct vm_area_struct *vma);
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extern spinlock_t *__pud_trans_huge_lock(pud_t *pud,
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struct vm_area_struct *vma);
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static inline int is_swap_pmd(pmd_t pmd)
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{
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return !pmd_none(pmd) && !pmd_present(pmd);
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}
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/* mmap_sem must be held on entry */
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static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
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struct vm_area_struct *vma)
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{
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if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd))
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return __pmd_trans_huge_lock(pmd, vma);
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else
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return NULL;
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}
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static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
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struct vm_area_struct *vma)
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{
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if (pud_trans_huge(*pud) || pud_devmap(*pud))
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return __pud_trans_huge_lock(pud, vma);
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else
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return NULL;
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}
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static inline int hpage_nr_pages(struct page *page)
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{
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if (unlikely(PageTransHuge(page)))
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return HPAGE_PMD_NR;
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return 1;
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}
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struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
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pmd_t *pmd, int flags, struct dev_pagemap **pgmap);
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struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
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pud_t *pud, int flags, struct dev_pagemap **pgmap);
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extern vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t orig_pmd);
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extern struct page *huge_zero_page;
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static inline bool is_huge_zero_page(struct page *page)
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{
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return READ_ONCE(huge_zero_page) == page;
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}
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static inline bool is_huge_zero_pmd(pmd_t pmd)
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{
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return is_huge_zero_page(pmd_page(pmd));
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}
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static inline bool is_huge_zero_pud(pud_t pud)
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{
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return false;
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}
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struct page *mm_get_huge_zero_page(struct mm_struct *mm);
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void mm_put_huge_zero_page(struct mm_struct *mm);
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#define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
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static inline bool thp_migration_supported(void)
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{
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return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
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}
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static inline struct list_head *page_deferred_list(struct page *page)
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{
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/*
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* Global or memcg deferred list in the second tail pages is
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* occupied by compound_head.
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*/
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return &page[2].deferred_list;
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}
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
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#define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
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#define HPAGE_PMD_SIZE ({ BUILD_BUG(); 0; })
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#define HPAGE_PUD_SHIFT ({ BUILD_BUG(); 0; })
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#define HPAGE_PUD_MASK ({ BUILD_BUG(); 0; })
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#define HPAGE_PUD_SIZE ({ BUILD_BUG(); 0; })
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static inline int hpage_nr_pages(struct page *page)
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{
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VM_BUG_ON_PAGE(PageTail(page), page);
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return 1;
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}
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static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
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{
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return false;
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}
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static inline bool transparent_hugepage_enabled(struct vm_area_struct *vma)
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{
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return false;
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}
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static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
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unsigned long haddr)
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{
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return false;
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}
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static inline void prep_transhuge_page(struct page *page) {}
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static inline bool is_transparent_hugepage(struct page *page)
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{
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return false;
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}
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#define transparent_hugepage_flags 0UL
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#define thp_get_unmapped_area NULL
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static inline bool
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can_split_huge_page(struct page *page, int *pextra_pins)
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{
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BUILD_BUG();
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return false;
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}
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static inline int
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split_huge_page_to_list(struct page *page, struct list_head *list)
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{
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return 0;
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}
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static inline int split_huge_page(struct page *page)
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{
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return 0;
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}
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static inline void deferred_split_huge_page(struct page *page) {}
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#define split_huge_pmd(__vma, __pmd, __address) \
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do { } while (0)
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static inline void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long address, bool freeze, struct page *page) {}
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static inline void split_huge_pmd_address(struct vm_area_struct *vma,
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unsigned long address, bool freeze, struct page *page) {}
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#define split_huge_pud(__vma, __pmd, __address) \
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do { } while (0)
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static inline int hugepage_madvise(struct vm_area_struct *vma,
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unsigned long *vm_flags, int advice)
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{
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BUG();
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return 0;
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}
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static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
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unsigned long start,
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unsigned long end,
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long adjust_next)
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{
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}
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static inline int is_swap_pmd(pmd_t pmd)
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{
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return 0;
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}
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static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
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struct vm_area_struct *vma)
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{
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return NULL;
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}
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static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
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struct vm_area_struct *vma)
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{
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return NULL;
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}
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static inline vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf,
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pmd_t orig_pmd)
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{
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return 0;
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}
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static inline bool is_huge_zero_page(struct page *page)
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{
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return false;
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}
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static inline bool is_huge_zero_pud(pud_t pud)
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{
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return false;
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}
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static inline void mm_put_huge_zero_page(struct mm_struct *mm)
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{
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return;
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}
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static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
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unsigned long addr, pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
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{
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return NULL;
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}
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static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
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unsigned long addr, pud_t *pud, int flags, struct dev_pagemap **pgmap)
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{
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return NULL;
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}
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static inline bool thp_migration_supported(void)
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{
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return false;
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif /* _LINUX_HUGE_MM_H */
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