linux/mm/pgtable-generic.c
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   1/*
   2 *  mm/pgtable-generic.c
   3 *
   4 *  Generic pgtable methods declared in asm-generic/pgtable.h
   5 *
   6 *  Copyright (C) 2010  Linus Torvalds
   7 */
   8
   9#include <linux/pagemap.h>
  10#include <asm/tlb.h>
  11#include <asm-generic/pgtable.h>
  12
  13#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
  14/*
  15 * Only sets the access flags (dirty, accessed, and
  16 * writable). Furthermore, we know it always gets set to a "more
  17 * permissive" setting, which allows most architectures to optimize
  18 * this. We return whether the PTE actually changed, which in turn
  19 * instructs the caller to do things like update__mmu_cache.  This
  20 * used to be done in the caller, but sparc needs minor faults to
  21 * force that call on sun4c so we changed this macro slightly
  22 */
  23int ptep_set_access_flags(struct vm_area_struct *vma,
  24                          unsigned long address, pte_t *ptep,
  25                          pte_t entry, int dirty)
  26{
  27        int changed = !pte_same(*ptep, entry);
  28        if (changed) {
  29                set_pte_at(vma->vm_mm, address, ptep, entry);
  30                flush_tlb_page(vma, address);
  31        }
  32        return changed;
  33}
  34#endif
  35
  36#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
  37int pmdp_set_access_flags(struct vm_area_struct *vma,
  38                          unsigned long address, pmd_t *pmdp,
  39                          pmd_t entry, int dirty)
  40{
  41#ifdef CONFIG_TRANSPARENT_HUGEPAGE
  42        int changed = !pmd_same(*pmdp, entry);
  43        VM_BUG_ON(address & ~HPAGE_PMD_MASK);
  44        if (changed) {
  45                set_pmd_at(vma->vm_mm, address, pmdp, entry);
  46                flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
  47        }
  48        return changed;
  49#else /* CONFIG_TRANSPARENT_HUGEPAGE */
  50        BUG();
  51        return 0;
  52#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  53}
  54#endif
  55
  56#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
  57int ptep_clear_flush_young(struct vm_area_struct *vma,
  58                           unsigned long address, pte_t *ptep)
  59{
  60        int young;
  61        young = ptep_test_and_clear_young(vma, address, ptep);
  62        if (young)
  63                flush_tlb_page(vma, address);
  64        return young;
  65}
  66#endif
  67
  68#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
  69int pmdp_clear_flush_young(struct vm_area_struct *vma,
  70                           unsigned long address, pmd_t *pmdp)
  71{
  72        int young;
  73#ifdef CONFIG_TRANSPARENT_HUGEPAGE
  74        VM_BUG_ON(address & ~HPAGE_PMD_MASK);
  75#else
  76        BUG();
  77#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  78        young = pmdp_test_and_clear_young(vma, address, pmdp);
  79        if (young)
  80                flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
  81        return young;
  82}
  83#endif
  84
  85#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
  86pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
  87                       pte_t *ptep)
  88{
  89        pte_t pte;
  90        pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
  91        flush_tlb_page(vma, address);
  92        return pte;
  93}
  94#endif
  95
  96#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
  97#ifdef CONFIG_TRANSPARENT_HUGEPAGE
  98pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
  99                       pmd_t *pmdp)
 100{
 101        pmd_t pmd;
 102        VM_BUG_ON(address & ~HPAGE_PMD_MASK);
 103        pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
 104        flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
 105        return pmd;
 106}
 107#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 108#endif
 109
 110#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 111#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 112void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
 113                          pmd_t *pmdp)
 114{
 115        pmd_t pmd = pmd_mksplitting(*pmdp);
 116        VM_BUG_ON(address & ~HPAGE_PMD_MASK);
 117        set_pmd_at(vma->vm_mm, address, pmdp, pmd);
 118        /* tlb flush only to serialize against gup-fast */
 119        flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
 120}
 121#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 122#endif
 123
 124#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
 125#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 126void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable)
 127{
 128        assert_spin_locked(&mm->page_table_lock);
 129
 130        /* FIFO */
 131        if (!mm->pmd_huge_pte)
 132                INIT_LIST_HEAD(&pgtable->lru);
 133        else
 134                list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
 135        mm->pmd_huge_pte = pgtable;
 136}
 137#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 138#endif
 139
 140#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
 141#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 142/* no "address" argument so destroys page coloring of some arch */
 143pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm)
 144{
 145        pgtable_t pgtable;
 146
 147        assert_spin_locked(&mm->page_table_lock);
 148
 149        /* FIFO */
 150        pgtable = mm->pmd_huge_pte;
 151        if (list_empty(&pgtable->lru))
 152                mm->pmd_huge_pte = NULL;
 153        else {
 154                mm->pmd_huge_pte = list_entry(pgtable->lru.next,
 155                                              struct page, lru);
 156                list_del(&pgtable->lru);
 157        }
 158        return pgtable;
 159}
 160#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 161#endif
 162
 163#ifndef __HAVE_ARCH_PMDP_INVALIDATE
 164#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 165void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
 166                     pmd_t *pmdp)
 167{
 168        set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
 169        flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
 170}
 171#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 172#endif
 173
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