4 * Generic pgtable methods declared in asm-generic/pgtable.h
6 * Copyright (C) 2010 Linus Torvalds
9 #include <linux/pagemap.h>
11 #include <asm-generic/pgtable.h>
13 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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
23 int ptep_set_access_flags(struct vm_area_struct *vma,
24 unsigned long address, pte_t *ptep,
25 pte_t entry, int dirty)
27 int changed = !pte_same(*ptep, entry);
29 set_pte_at(vma->vm_mm, address, ptep, entry);
30 flush_tlb_fix_spurious_fault(vma, address);
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)
41 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
42 int changed = !pmd_same(*pmdp, entry);
43 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
45 set_pmd_at(vma->vm_mm, address, pmdp, entry);
46 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
49 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
52 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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)
61 young = ptep_test_and_clear_young(vma, address, ptep);
63 flush_tlb_page(vma, address);
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)
73 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
74 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
77 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
78 young = pmdp_test_and_clear_young(vma, address, pmdp);
80 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
85 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
86 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
90 pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
91 if (pte_accessible(pte))
92 flush_tlb_page(vma, address);
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,
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);
108 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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,
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);
122 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
125 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
126 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
127 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
130 assert_spin_locked(&mm->page_table_lock);
133 if (!mm->pmd_huge_pte)
134 INIT_LIST_HEAD(&pgtable->lru);
136 list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
137 mm->pmd_huge_pte = pgtable;
139 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
142 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
143 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
144 /* no "address" argument so destroys page coloring of some arch */
145 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
149 assert_spin_locked(&mm->page_table_lock);
152 pgtable = mm->pmd_huge_pte;
153 if (list_empty(&pgtable->lru))
154 mm->pmd_huge_pte = NULL;
156 mm->pmd_huge_pte = list_entry(pgtable->lru.next,
158 list_del(&pgtable->lru);
162 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
165 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
166 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
167 void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
170 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
171 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
173 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */