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), as well as write 
   16  * permission. 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  */
   23 int 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_fix_spurious_fault(vma, address);
   31         }
   32         return changed;
   33 }
   34 #endif
   35 
   36 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
   37 int 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
   57 int 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
   69 int 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
   86 pte_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         if (pte_accessible(pte))
   92                 flush_tlb_page(vma, address);
   93         return pte;
   94 }
   95 #endif
   96 
   97 #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
   98 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
   99 pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
  100                        pmd_t *pmdp)
  101 {
  102         pmd_t pmd;
  103         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
  104         pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
  105         flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
  106         return pmd;
  107 }
  108 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  109 #endif
  110 
  111 #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
  112 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  113 void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
  114                           pmd_t *pmdp)
  115 {
  116         pmd_t pmd = pmd_mksplitting(*pmdp);
  117         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
  118         set_pmd_at(vma->vm_mm, address, pmdp, pmd);
  119         /* tlb flush only to serialize against gup-fast */
  120         flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
  121 }
  122 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  123 #endif
  124 
  125 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
  126 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  127 void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable)
  128 {
  129         assert_spin_locked(&mm->page_table_lock);
  130 
  131         /* FIFO */
  132         if (!mm->pmd_huge_pte)
  133                 INIT_LIST_HEAD(&pgtable->lru);
  134         else
  135                 list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
  136         mm->pmd_huge_pte = pgtable;
  137 }
  138 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  139 #endif
  140 
  141 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
  142 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  143 /* no "address" argument so destroys page coloring of some arch */
  144 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm)
  145 {
  146         pgtable_t pgtable;
  147 
  148         assert_spin_locked(&mm->page_table_lock);
  149 
  150         /* FIFO */
  151         pgtable = mm->pmd_huge_pte;
  152         if (list_empty(&pgtable->lru))
  153                 mm->pmd_huge_pte = NULL;
  154         else {
  155                 mm->pmd_huge_pte = list_entry(pgtable->lru.next,
  156                                               struct page, lru);
  157                 list_del(&pgtable->lru);
  158         }
  159         return pgtable;
  160 }
  161 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  162 #endif
  163 
  164 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
  165 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  166 void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
  167                      pmd_t *pmdp)
  168 {
  169         set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
  170         flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
  171 }
  172 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
  173 #endif

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FreeBSD/Linux Kernel Cross Reference sys/mm/pgtable-generic.c

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sys/mm/pgtable-generic.c