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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 <asm/tlb.h> | |
10 | #include <asm-generic/pgtable.h> | |
11 | ||
12 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS | |
13 | /* | |
14 | * Only sets the access flags (dirty, accessed, and | |
15 | * writable). Furthermore, we know it always gets set to a "more | |
16 | * permissive" setting, which allows most architectures to optimize | |
17 | * this. We return whether the PTE actually changed, which in turn | |
18 | * instructs the caller to do things like update__mmu_cache. This | |
19 | * used to be done in the caller, but sparc needs minor faults to | |
20 | * force that call on sun4c so we changed this macro slightly | |
21 | */ | |
22 | int ptep_set_access_flags(struct vm_area_struct *vma, | |
23 | unsigned long address, pte_t *ptep, | |
24 | pte_t entry, int dirty) | |
25 | { | |
26 | int changed = !pte_same(*ptep, entry); | |
27 | if (changed) { | |
28 | set_pte_at(vma->vm_mm, address, ptep, entry); | |
29 | flush_tlb_page(vma, address); | |
30 | } | |
31 | return changed; | |
32 | } | |
33 | #endif | |
34 | ||
35 | #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS | |
36 | int pmdp_set_access_flags(struct vm_area_struct *vma, | |
37 | unsigned long address, pmd_t *pmdp, | |
38 | pmd_t entry, int dirty) | |
39 | { | |
40 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
41 | int changed = !pmd_same(*pmdp, entry); | |
42 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
43 | if (changed) { | |
44 | set_pmd_at(vma->vm_mm, address, pmdp, entry); | |
45 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
46 | } | |
47 | return changed; | |
48 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
49 | BUG(); | |
50 | return 0; | |
51 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
52 | } | |
53 | #endif | |
54 | ||
55 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
56 | int ptep_clear_flush_young(struct vm_area_struct *vma, | |
57 | unsigned long address, pte_t *ptep) | |
58 | { | |
59 | int young; | |
60 | young = ptep_test_and_clear_young(vma, address, ptep); | |
61 | if (young) | |
62 | flush_tlb_page(vma, address); | |
63 | return young; | |
64 | } | |
65 | #endif | |
66 | ||
67 | #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH | |
68 | int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
69 | unsigned long address, pmd_t *pmdp) | |
70 | { | |
71 | int young; | |
72 | #ifndef CONFIG_TRANSPARENT_HUGEPAGE | |
73 | BUG(); | |
74 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
75 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
76 | young = pmdp_test_and_clear_young(vma, address, pmdp); | |
77 | if (young) | |
78 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
79 | return young; | |
80 | } | |
81 | #endif | |
82 | ||
83 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH | |
84 | pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, | |
85 | pte_t *ptep) | |
86 | { | |
87 | pte_t pte; | |
88 | pte = ptep_get_and_clear((vma)->vm_mm, address, ptep); | |
89 | flush_tlb_page(vma, address); | |
90 | return pte; | |
91 | } | |
92 | #endif | |
93 | ||
94 | #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH | |
95 | pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address, | |
96 | pmd_t *pmdp) | |
97 | { | |
98 | pmd_t pmd; | |
99 | #ifndef CONFIG_TRANSPARENT_HUGEPAGE | |
100 | BUG(); | |
101 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
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 | |
108 | ||
109 | #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH | |
110 | pmd_t pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, | |
111 | pmd_t *pmdp) | |
112 | { | |
113 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
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 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
120 | BUG(); | |
121 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
122 | } | |
123 | #endif |