551 lines
16 KiB
C
551 lines
16 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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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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/*
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* Mask of all large folio orders supported for anonymous THP; all orders up to
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* and including PMD_ORDER, except order-0 (which is not "huge") and order-1
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* (which is a limitation of the THP implementation).
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*/
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#define THP_ORDERS_ALL_ANON ((BIT(PMD_ORDER + 1) - 1) & ~(BIT(0) | BIT(1)))
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/*
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* Mask of all large folio orders supported for file THP.
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*/
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#define THP_ORDERS_ALL_FILE (BIT(PMD_ORDER) | BIT(PUD_ORDER))
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/*
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* Mask of all large folio orders supported for THP.
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*/
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#define THP_ORDERS_ALL (THP_ORDERS_ALL_ANON | THP_ORDERS_ALL_FILE)
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#define thp_vma_allowable_order(vma, vm_flags, smaps, in_pf, enforce_sysfs, order) \
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(!!thp_vma_allowable_orders(vma, vm_flags, smaps, in_pf, enforce_sysfs, BIT(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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extern unsigned long huge_anon_orders_always;
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extern unsigned long huge_anon_orders_madvise;
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extern unsigned long huge_anon_orders_inherit;
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static inline bool hugepage_global_enabled(void)
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{
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return 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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}
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static inline bool hugepage_global_always(void)
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{
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return transparent_hugepage_flags &
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(1<<TRANSPARENT_HUGEPAGE_FLAG);
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}
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static inline bool hugepage_flags_enabled(void)
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{
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/*
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* We cover both the anon and the file-backed case here; we must return
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* true if globally enabled, even when all anon sizes are set to never.
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* So we don't need to look at huge_anon_orders_inherit.
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*/
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return hugepage_global_enabled() ||
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huge_anon_orders_always ||
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huge_anon_orders_madvise;
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}
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static inline int highest_order(unsigned long orders)
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{
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return fls_long(orders) - 1;
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}
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static inline int next_order(unsigned long *orders, int prev)
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{
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*orders &= ~BIT(prev);
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return highest_order(*orders);
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}
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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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* order-aligned within the file. The hugepage is
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* guaranteed to be order-aligned within the file, but we must
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* check that the order-aligned addresses in the VMA map to
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* order-aligned offsets within the file, else the hugepage will
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* not be mappable.
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* - For all vmas, check if the haddr is in an aligned hugepage
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* area.
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*/
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static inline bool thp_vma_suitable_order(struct vm_area_struct *vma,
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unsigned long addr, int order)
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{
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unsigned long hpage_size = PAGE_SIZE << order;
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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_size >> PAGE_SHIFT))
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return false;
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}
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haddr = ALIGN_DOWN(addr, hpage_size);
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if (haddr < vma->vm_start || haddr + hpage_size > vma->vm_end)
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return false;
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return true;
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}
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/*
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* Filter the bitfield of input orders to the ones suitable for use in the vma.
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* See thp_vma_suitable_order().
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* All orders that pass the checks are returned as a bitfield.
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*/
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static inline unsigned long thp_vma_suitable_orders(struct vm_area_struct *vma,
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unsigned long addr, unsigned long orders)
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{
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int order;
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/*
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* Iterate over orders, highest to lowest, removing orders that don't
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* meet alignment requirements from the set. Exit loop at first order
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* that meets requirements, since all lower orders must also meet
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* requirements.
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*/
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order = highest_order(orders);
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while (orders) {
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if (thp_vma_suitable_order(vma, addr, order))
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break;
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order = next_order(&orders, order);
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}
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return orders;
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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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!inode_is_open_for_write(inode) && S_ISREG(inode->i_mode);
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}
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unsigned long __thp_vma_allowable_orders(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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unsigned long orders);
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/**
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* thp_vma_allowable_orders - determine hugepage orders that are allowed for vma
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* @vma: the vm area to check
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* @vm_flags: use these vm_flags instead of vma->vm_flags
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* @smaps: whether answer will be used for smaps file
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* @in_pf: whether answer will be used by page fault handler
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* @enforce_sysfs: whether sysfs config should be taken into account
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* @orders: bitfield of all orders to consider
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*
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* Calculates the intersection of the requested hugepage orders and the allowed
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* hugepage orders for the provided vma. Permitted orders are encoded as a set
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* bit at the corresponding bit position (bit-2 corresponds to order-2, bit-3
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* corresponds to order-3, etc). Order-0 is never considered a hugepage order.
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*
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* Return: bitfield of orders allowed for hugepage in the vma. 0 if no hugepage
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* orders are allowed.
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*/
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static inline
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unsigned long thp_vma_allowable_orders(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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unsigned long orders)
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{
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/* Optimization to check if required orders are enabled early. */
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if (enforce_sysfs && vma_is_anonymous(vma)) {
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unsigned long mask = READ_ONCE(huge_anon_orders_always);
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if (vm_flags & VM_HUGEPAGE)
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mask |= READ_ONCE(huge_anon_orders_madvise);
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if (hugepage_global_always() ||
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((vm_flags & VM_HUGEPAGE) && hugepage_global_enabled()))
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mask |= READ_ONCE(huge_anon_orders_inherit);
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orders &= mask;
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if (!orders)
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return 0;
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}
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return __thp_vma_allowable_orders(vma, vm_flags, smaps, in_pf,
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enforce_sysfs, orders);
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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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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 folio_prep_large_rmappable(struct folio *folio);
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bool can_split_folio(struct folio *folio, int *pextra_pins);
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int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
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unsigned int new_order);
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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_to_order(page, NULL, 0);
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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 thp_vma_suitable_order(struct vm_area_struct *vma,
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unsigned long addr, int order)
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{
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return false;
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}
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static inline unsigned long thp_vma_suitable_orders(struct vm_area_struct *vma,
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unsigned long addr, unsigned long orders)
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{
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return 0;
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}
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static inline unsigned long thp_vma_allowable_orders(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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unsigned long orders)
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{
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return 0;
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}
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static inline void folio_prep_large_rmappable(struct folio *folio) {}
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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_to_order(struct page *page, struct list_head *list,
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unsigned int new_order)
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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)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
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 */
|
|
|
|
static inline int split_folio_to_list_to_order(struct folio *folio,
|
|
struct list_head *list, int new_order)
|
|
{
|
|
return split_huge_page_to_list_to_order(&folio->page, list, new_order);
|
|
}
|
|
|
|
static inline int split_folio_to_order(struct folio *folio, int new_order)
|
|
{
|
|
return split_folio_to_list_to_order(folio, NULL, new_order);
|
|
}
|
|
|
|
#define split_folio_to_list(f, l) split_folio_to_list_to_order(f, l, 0)
|
|
#define split_folio(f) split_folio_to_order(f, 0)
|
|
|
|
/*
|
|
* archs that select ARCH_WANTS_THP_SWAP but don't support THP_SWP due to
|
|
* limitations in the implementation like arm64 MTE can override this to
|
|
* false
|
|
*/
|
|
#ifndef arch_thp_swp_supported
|
|
static inline bool arch_thp_swp_supported(void)
|
|
{
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
#endif /* _LINUX_HUGE_MM_H */
|