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