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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 | /* | |
14 | * If a p?d_bad entry is found while walking page tables, report | |
15 | * the error, before resetting entry to p?d_none. Usually (but | |
16 | * very seldom) called out from the p?d_none_or_clear_bad macros. | |
17 | */ | |
18 | ||
19 | void pgd_clear_bad(pgd_t *pgd) | |
20 | { | |
21 | pgd_ERROR(*pgd); | |
22 | pgd_clear(pgd); | |
23 | } | |
24 | ||
25 | void pud_clear_bad(pud_t *pud) | |
26 | { | |
27 | pud_ERROR(*pud); | |
28 | pud_clear(pud); | |
29 | } | |
30 | ||
31 | void pmd_clear_bad(pmd_t *pmd) | |
32 | { | |
33 | pmd_ERROR(*pmd); | |
34 | pmd_clear(pmd); | |
35 | } | |
36 | ||
37 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS | |
38 | /* | |
39 | * Only sets the access flags (dirty, accessed), as well as write | |
40 | * permission. Furthermore, we know it always gets set to a "more | |
41 | * permissive" setting, which allows most architectures to optimize | |
42 | * this. We return whether the PTE actually changed, which in turn | |
43 | * instructs the caller to do things like update__mmu_cache. This | |
44 | * used to be done in the caller, but sparc needs minor faults to | |
45 | * force that call on sun4c so we changed this macro slightly | |
46 | */ | |
47 | int ptep_set_access_flags(struct vm_area_struct *vma, | |
48 | unsigned long address, pte_t *ptep, | |
49 | pte_t entry, int dirty) | |
50 | { | |
51 | int changed = !pte_same(*ptep, entry); | |
52 | if (changed) { | |
53 | set_pte_at(vma->vm_mm, address, ptep, entry); | |
54 | flush_tlb_fix_spurious_fault(vma, address); | |
55 | } | |
56 | return changed; | |
57 | } | |
58 | #endif | |
59 | ||
60 | #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS | |
61 | int pmdp_set_access_flags(struct vm_area_struct *vma, | |
62 | unsigned long address, pmd_t *pmdp, | |
63 | pmd_t entry, int dirty) | |
64 | { | |
65 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
66 | int changed = !pmd_same(*pmdp, entry); | |
67 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
68 | if (changed) { | |
69 | set_pmd_at(vma->vm_mm, address, pmdp, entry); | |
70 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
71 | } | |
72 | return changed; | |
73 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
74 | BUG(); | |
75 | return 0; | |
76 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
77 | } | |
78 | #endif | |
79 | ||
80 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
81 | int ptep_clear_flush_young(struct vm_area_struct *vma, | |
82 | unsigned long address, pte_t *ptep) | |
83 | { | |
84 | int young; | |
85 | young = ptep_test_and_clear_young(vma, address, ptep); | |
86 | if (young) | |
87 | flush_tlb_page(vma, address); | |
88 | return young; | |
89 | } | |
90 | #endif | |
91 | ||
92 | #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH | |
93 | int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
94 | unsigned long address, pmd_t *pmdp) | |
95 | { | |
96 | int young; | |
97 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
98 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
99 | #else | |
100 | BUG(); | |
101 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
102 | young = pmdp_test_and_clear_young(vma, address, pmdp); | |
103 | if (young) | |
104 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
105 | return young; | |
106 | } | |
107 | #endif | |
108 | ||
109 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH | |
110 | pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, | |
111 | pte_t *ptep) | |
112 | { | |
113 | struct mm_struct *mm = (vma)->vm_mm; | |
114 | pte_t pte; | |
115 | pte = ptep_get_and_clear(mm, address, ptep); | |
116 | if (pte_accessible(mm, pte)) | |
117 | flush_tlb_page(vma, address); | |
118 | return pte; | |
119 | } | |
120 | #endif | |
121 | ||
122 | #ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH | |
123 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
124 | pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address, | |
125 | pmd_t *pmdp) | |
126 | { | |
127 | pmd_t pmd; | |
128 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
129 | pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp); | |
130 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
131 | return pmd; | |
132 | } | |
133 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
134 | #endif | |
135 | ||
136 | #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH | |
137 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
138 | void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, | |
139 | pmd_t *pmdp) | |
140 | { | |
141 | pmd_t pmd = pmd_mksplitting(*pmdp); | |
142 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
143 | set_pmd_at(vma->vm_mm, address, pmdp, pmd); | |
144 | /* tlb flush only to serialize against gup-fast */ | |
145 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
146 | } | |
147 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
148 | #endif | |
149 | ||
150 | #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT | |
151 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
152 | void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, | |
153 | pgtable_t pgtable) | |
154 | { | |
155 | assert_spin_locked(pmd_lockptr(mm, pmdp)); | |
156 | ||
157 | /* FIFO */ | |
158 | if (!pmd_huge_pte(mm, pmdp)) | |
159 | INIT_LIST_HEAD(&pgtable->lru); | |
160 | else | |
161 | list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru); | |
162 | pmd_huge_pte(mm, pmdp) = pgtable; | |
163 | } | |
164 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
165 | #endif | |
166 | ||
167 | #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW | |
168 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
169 | /* no "address" argument so destroys page coloring of some arch */ | |
170 | pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) | |
171 | { | |
172 | pgtable_t pgtable; | |
173 | ||
174 | assert_spin_locked(pmd_lockptr(mm, pmdp)); | |
175 | ||
176 | /* FIFO */ | |
177 | pgtable = pmd_huge_pte(mm, pmdp); | |
178 | if (list_empty(&pgtable->lru)) | |
179 | pmd_huge_pte(mm, pmdp) = NULL; | |
180 | else { | |
181 | pmd_huge_pte(mm, pmdp) = list_entry(pgtable->lru.next, | |
182 | struct page, lru); | |
183 | list_del(&pgtable->lru); | |
184 | } | |
185 | return pgtable; | |
186 | } | |
187 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
188 | #endif | |
189 | ||
190 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE | |
191 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
192 | void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, | |
193 | pmd_t *pmdp) | |
194 | { | |
195 | pmd_t entry = *pmdp; | |
196 | if (pmd_numa(entry)) | |
197 | entry = pmd_mknonnuma(entry); | |
198 | set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp)); | |
199 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
200 | } | |
201 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
202 | #endif |