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e2cda322 AA |
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 | ||
f95ba941 | 9 | #include <linux/pagemap.h> |
e2cda322 AA |
10 | #include <asm/tlb.h> |
11 | #include <asm-generic/pgtable.h> | |
12 | ||
13 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS | |
14 | /* | |
cef23d9d RR |
15 | * Only sets the access flags (dirty, accessed), as well as write |
16 | * permission. Furthermore, we know it always gets set to a "more | |
e2cda322 AA |
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); | |
cef23d9d | 30 | flush_tlb_fix_spurious_fault(vma, address); |
e2cda322 AA |
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; | |
d8c37c48 NH |
73 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
74 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
75 | #else | |
e2cda322 AA |
76 | BUG(); |
77 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
e2cda322 AA |
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); | |
8d1acce4 RR |
91 | if (pte_accessible(pte)) |
92 | flush_tlb_page(vma, address); | |
e2cda322 AA |
93 | return pte; |
94 | } | |
95 | #endif | |
96 | ||
97 | #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH | |
b3697c02 | 98 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
e2cda322 AA |
99 | pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address, |
100 | pmd_t *pmdp) | |
101 | { | |
102 | pmd_t pmd; | |
e2cda322 AA |
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 | } | |
b3697c02 | 108 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
e2cda322 AA |
109 | #endif |
110 | ||
111 | #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH | |
b3697c02 | 112 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
73636b1a CM |
113 | void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, |
114 | pmd_t *pmdp) | |
e2cda322 | 115 | { |
e2cda322 AA |
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); | |
e2cda322 | 121 | } |
b3697c02 | 122 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
e2cda322 | 123 | #endif |
e3ebcf64 GS |
124 | |
125 | #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT | |
126 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
6b0b50b0 AK |
127 | void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, |
128 | pgtable_t pgtable) | |
e3ebcf64 GS |
129 | { |
130 | assert_spin_locked(&mm->page_table_lock); | |
131 | ||
132 | /* FIFO */ | |
133 | if (!mm->pmd_huge_pte) | |
134 | INIT_LIST_HEAD(&pgtable->lru); | |
135 | else | |
136 | list_add(&pgtable->lru, &mm->pmd_huge_pte->lru); | |
137 | mm->pmd_huge_pte = pgtable; | |
138 | } | |
139 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
140 | #endif | |
141 | ||
142 | #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW | |
143 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
144 | /* no "address" argument so destroys page coloring of some arch */ | |
6b0b50b0 | 145 | pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) |
e3ebcf64 GS |
146 | { |
147 | pgtable_t pgtable; | |
148 | ||
149 | assert_spin_locked(&mm->page_table_lock); | |
150 | ||
151 | /* FIFO */ | |
152 | pgtable = mm->pmd_huge_pte; | |
153 | if (list_empty(&pgtable->lru)) | |
154 | mm->pmd_huge_pte = NULL; | |
155 | else { | |
156 | mm->pmd_huge_pte = list_entry(pgtable->lru.next, | |
157 | struct page, lru); | |
158 | list_del(&pgtable->lru); | |
159 | } | |
160 | return pgtable; | |
161 | } | |
162 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
163 | #endif | |
46dcde73 GS |
164 | |
165 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE | |
166 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
167 | void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, | |
168 | pmd_t *pmdp) | |
169 | { | |
170 | set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp)); | |
171 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
172 | } | |
173 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
174 | #endif |