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mm/pgtable-generic.c
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// SPDX-License-Identifier: GPL-2.0 |
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/* * mm/pgtable-generic.c * * Generic pgtable methods declared in asm-generic/pgtable.h * * Copyright (C) 2010 Linus Torvalds */ |
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#include <linux/pagemap.h> |
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#include <linux/hugetlb.h> |
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#include <asm/tlb.h> #include <asm-generic/pgtable.h> |
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/* * If a p?d_bad entry is found while walking page tables, report * the error, before resetting entry to p?d_none. Usually (but * very seldom) called out from the p?d_none_or_clear_bad macros. */ void pgd_clear_bad(pgd_t *pgd) { pgd_ERROR(*pgd); pgd_clear(pgd); } |
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#ifndef __PAGETABLE_P4D_FOLDED |
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void p4d_clear_bad(p4d_t *p4d) { p4d_ERROR(*p4d); p4d_clear(p4d); } |
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#endif |
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#ifndef __PAGETABLE_PUD_FOLDED |
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void pud_clear_bad(pud_t *pud) { pud_ERROR(*pud); pud_clear(pud); } |
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#endif |
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/* * Note that the pmd variant below can't be stub'ed out just as for p4d/pud * above. pmd folding is special and typically pmd_* macros refer to upper * level even when folded */ |
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void pmd_clear_bad(pmd_t *pmd) { pmd_ERROR(*pmd); pmd_clear(pmd); } |
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#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS /* |
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* Only sets the access flags (dirty, accessed), as well as write * permission. Furthermore, we know it always gets set to a "more |
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* permissive" setting, which allows most architectures to optimize * this. We return whether the PTE actually changed, which in turn * instructs the caller to do things like update__mmu_cache. This * used to be done in the caller, but sparc needs minor faults to * force that call on sun4c so we changed this macro slightly */ int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address, pte_t *ptep, pte_t entry, int dirty) { int changed = !pte_same(*ptep, entry); if (changed) { set_pte_at(vma->vm_mm, address, ptep, entry); |
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flush_tlb_fix_spurious_fault(vma, address); |
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} return changed; } #endif |
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#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH int ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) { int young; young = ptep_test_and_clear_young(vma, address, ptep); if (young) flush_tlb_page(vma, address); return young; } #endif #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) { struct mm_struct *mm = (vma)->vm_mm; pte_t pte; pte = ptep_get_and_clear(mm, address, ptep); if (pte_accessible(mm, pte)) flush_tlb_page(vma, address); return pte; } #endif |
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
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#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp, pmd_t entry, int dirty) { |
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int changed = !pmd_same(*pmdp, entry); VM_BUG_ON(address & ~HPAGE_PMD_MASK); if (changed) { set_pmd_at(vma->vm_mm, address, pmdp, entry); |
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flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
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} return changed; |
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} #endif |
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#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH int pmdp_clear_flush_young(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { int young; |
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VM_BUG_ON(address & ~HPAGE_PMD_MASK); |
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young = pmdp_test_and_clear_young(vma, address, pmdp); if (young) |
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flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
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return young; } #endif |
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#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH |
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pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) |
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{ pmd_t pmd; |
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VM_BUG_ON(address & ~HPAGE_PMD_MASK); |
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VM_BUG_ON((pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp)) || !pmd_present(*pmdp)); |
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pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); |
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flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
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return pmd; } |
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address, pud_t *pudp) { pud_t pud; VM_BUG_ON(address & ~HPAGE_PUD_MASK); VM_BUG_ON(!pud_trans_huge(*pudp) && !pud_devmap(*pudp)); pud = pudp_huge_get_and_clear(vma->vm_mm, address, pudp); flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE); return pud; } #endif |
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#endif |
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#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT |
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void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, pgtable_t pgtable) |
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{ |
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assert_spin_locked(pmd_lockptr(mm, pmdp)); |
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/* FIFO */ |
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if (!pmd_huge_pte(mm, pmdp)) |
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INIT_LIST_HEAD(&pgtable->lru); else |
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list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru); pmd_huge_pte(mm, pmdp) = pgtable; |
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} |
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#endif #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW |
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/* no "address" argument so destroys page coloring of some arch */ |
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pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) |
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{ pgtable_t pgtable; |
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assert_spin_locked(pmd_lockptr(mm, pmdp)); |
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/* FIFO */ |
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pgtable = pmd_huge_pte(mm, pmdp); |
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pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru, struct page, lru); if (pmd_huge_pte(mm, pmdp)) |
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list_del(&pgtable->lru); |
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return pgtable; } |
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#endif |
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#ifndef __HAVE_ARCH_PMDP_INVALIDATE |
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pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, |
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pmd_t *pmdp) { |
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pmd_t old = pmdp_establish(vma, address, pmdp, pmd_mknotpresent(*pmdp)); |
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flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
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return old; |
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} |
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#endif |
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#ifndef pmdp_collapse_flush |
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pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { |
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/* * pmd and hugepage pte format are same. So we could * use the same function. */ |
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pmd_t pmd; VM_BUG_ON(address & ~HPAGE_PMD_MASK); VM_BUG_ON(pmd_trans_huge(*pmdp)); |
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pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); |
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/* collapse entails shooting down ptes not pmd */ flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
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return pmd; } |
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#endif |
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |