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#ifndef CONFIG_TRANSPARENT_HUGEPAGE
  74        BUG();
  75#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  76        VM_BUG_ON(address & ~HPAGE_PMD_MASK);
  77        young = pmdp_test_and_clear_young(vma, address, pmdp);
  78        if (young)
  79                flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
  80        return young;
  81}
  82#endif
  83
  84#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
  85pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
  86                       pte_t *ptep)
  87{
  88        pte_t pte;
  89        pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
  90        flush_tlb_page(vma, address);
  91        return pte;
  92}
  93#endif
  94
  95#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
  96#ifdef CONFIG_TRANSPARENT_HUGEPAGE
  97pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
  98                       pmd_t *pmdp)
  99{
 100        pmd_t pmd;
 101        VM_BUG_ON(address & ~HPAGE_PMD_MASK);
 102        pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
 103        flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
 104        return pmd;
 105}
 106#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 107#endif
 108
 109#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 110#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 111pmd_t pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
 112                           pmd_t *pmdp)
 113{
 114        pmd_t pmd = pmd_mksplitting(*pmdp);
 115        VM_BUG_ON(address & ~HPAGE_PMD_MASK);
 116        set_pmd_at(vma->vm_mm, address, pmdp, pmd);
 117        /* tlb flush only to serialize against gup-fast */
 118        flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
 119}
 120#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 121#endif
 122
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