421 lines
12 KiB
C
421 lines
12 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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vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
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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 *dst_vma, struct vm_area_struct *src_vma);
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void huge_pmd_set_accessed(struct vm_fault *vmf);
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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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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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vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf);
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struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
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unsigned long addr, pmd_t *pmd,
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unsigned int flags);
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bool madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
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pmd_t *pmd, unsigned long addr, unsigned long next);
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int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd,
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unsigned long addr);
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int zap_huge_pud(struct mmu_gather *tlb, struct vm_area_struct *vma, pud_t *pud,
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unsigned long addr);
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bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
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unsigned long new_addr, pmd_t *old_pmd, pmd_t *new_pmd);
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int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
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pmd_t *pmd, 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(struct vm_fault *vmf, pfn_t pfn, bool write);
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vm_fault_t vmf_insert_pfn_pud(struct vm_fault *vmf, pfn_t pfn, bool write);
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enum transparent_hugepage_flag {
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TRANSPARENT_HUGEPAGE_UNSUPPORTED,
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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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};
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struct kobject;
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struct kobj_attribute;
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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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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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#define hugepage_flags_enabled() \
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(transparent_hugepage_flags & \
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((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
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(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
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#define hugepage_flags_always() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_FLAG))
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/*
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* Do the below checks:
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* - For file vma, check if the linear page offset of vma is
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* HPAGE_PMD_NR aligned within the file. The hugepage is
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* guaranteed to be hugepage-aligned within the file, but we must
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* check that the PMD-aligned addresses in the VMA map to
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* PMD-aligned offsets within the file, else the hugepage will
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* not be PMD-mappable.
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* - For all vmas, check if the haddr is in an aligned HPAGE_PMD_SIZE
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* area.
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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 addr)
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{
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unsigned long haddr;
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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 (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
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HPAGE_PMD_NR))
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return false;
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}
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haddr = addr & HPAGE_PMD_MASK;
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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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static inline bool file_thp_enabled(struct vm_area_struct *vma)
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{
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struct inode *inode;
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if (!vma->vm_file)
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return false;
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inode = vma->vm_file->f_inode;
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return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) &&
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(vma->vm_flags & VM_EXEC) &&
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!inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
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}
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bool hugepage_vma_check(struct vm_area_struct *vma, unsigned long vm_flags,
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bool smaps, bool in_pf, bool enforce_sysfs);
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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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unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags);
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void prep_transhuge_page(struct page *page);
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void free_transhuge_page(struct page *page);
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bool can_split_folio(struct folio *folio, 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_folio(struct folio *folio);
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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 folio *folio);
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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 folio *folio);
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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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int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags,
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int advice);
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int madvise_collapse(struct vm_area_struct *vma,
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struct vm_area_struct **prev,
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unsigned long start, unsigned long end);
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void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
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unsigned long end, long adjust_next);
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spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
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spinlock_t *__pud_trans_huge_lock(pud_t *pud, 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_lock 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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/**
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* folio_test_pmd_mappable - Can we map this folio with a PMD?
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* @folio: The folio to test
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*/
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static inline bool folio_test_pmd_mappable(struct folio *folio)
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{
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return folio_order(folio) >= HPAGE_PMD_ORDER;
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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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vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf);
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extern struct page *huge_zero_page;
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extern unsigned long huge_zero_pfn;
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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 pmd_present(pmd) && READ_ONCE(huge_zero_pfn) == pmd_pfn(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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#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 bool folio_test_pmd_mappable(struct folio *folio)
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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 addr)
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{
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return false;
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}
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static inline bool hugepage_vma_check(struct vm_area_struct *vma,
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unsigned long vm_flags, bool smaps,
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bool in_pf, bool enforce_sysfs)
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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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#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_folio(struct folio *folio, int *pextra_pins)
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{
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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_folio(struct folio *folio) {}
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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 folio *folio) {}
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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 folio *folio) {}
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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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return -EINVAL;
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}
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static inline int madvise_collapse(struct vm_area_struct *vma,
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struct vm_area_struct **prev,
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unsigned long start, unsigned long end)
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{
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return -EINVAL;
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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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{
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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_pmd(pmd_t pmd)
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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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static inline int split_folio_to_list(struct folio *folio,
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struct list_head *list)
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{
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return split_huge_page_to_list(&folio->page, list);
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}
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static inline int split_folio(struct folio *folio)
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{
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return split_folio_to_list(folio, NULL);
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}
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/*
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* archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to
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* limitations in the implementation like arm64 MTE can override this to
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* false
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*/
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#ifndef arch_thp_swp_supported
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static inline bool arch_thp_swp_supported(void)
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{
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return true;
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}
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#endif
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#endif /* _LINUX_HUGE_MM_H */
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