Commit | Line | Data |
---|---|---|
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 | ||
bc4b4448 JK |
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 | ||
e2cda322 AA |
37 | #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
38 | /* | |
cef23d9d RR |
39 | * Only sets the access flags (dirty, accessed), as well as write |
40 | * permission. Furthermore, we know it always gets set to a "more | |
e2cda322 AA |
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); | |
cef23d9d | 54 | flush_tlb_fix_spurious_fault(vma, address); |
e2cda322 AA |
55 | } |
56 | return changed; | |
57 | } | |
58 | #endif | |
59 | ||
52585bcc VG |
60 | #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH |
61 | int ptep_clear_flush_young(struct vm_area_struct *vma, | |
62 | unsigned long address, pte_t *ptep) | |
63 | { | |
64 | int young; | |
65 | young = ptep_test_and_clear_young(vma, address, ptep); | |
66 | if (young) | |
67 | flush_tlb_page(vma, address); | |
68 | return young; | |
69 | } | |
70 | #endif | |
71 | ||
72 | #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH | |
73 | pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address, | |
74 | pte_t *ptep) | |
75 | { | |
76 | struct mm_struct *mm = (vma)->vm_mm; | |
77 | pte_t pte; | |
78 | pte = ptep_get_and_clear(mm, address, ptep); | |
79 | if (pte_accessible(mm, pte)) | |
80 | flush_tlb_page(vma, address); | |
81 | return pte; | |
82 | } | |
83 | #endif | |
84 | ||
bd5e88ad VG |
85 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
86 | ||
e2cda322 AA |
87 | #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS |
88 | int pmdp_set_access_flags(struct vm_area_struct *vma, | |
89 | unsigned long address, pmd_t *pmdp, | |
90 | pmd_t entry, int dirty) | |
91 | { | |
e2cda322 AA |
92 | int changed = !pmd_same(*pmdp, entry); |
93 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
94 | if (changed) { | |
95 | set_pmd_at(vma->vm_mm, address, pmdp, entry); | |
96 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
97 | } | |
98 | return changed; | |
e2cda322 AA |
99 | } |
100 | #endif | |
101 | ||
e2cda322 AA |
102 | #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH |
103 | int pmdp_clear_flush_young(struct vm_area_struct *vma, | |
104 | unsigned long address, pmd_t *pmdp) | |
105 | { | |
106 | int young; | |
d8c37c48 | 107 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); |
e2cda322 AA |
108 | young = pmdp_test_and_clear_young(vma, address, pmdp); |
109 | if (young) | |
110 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
111 | return young; | |
112 | } | |
113 | #endif | |
114 | ||
8809aa2d | 115 | #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH |
8809aa2d AK |
116 | pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address, |
117 | pmd_t *pmdp) | |
e2cda322 AA |
118 | { |
119 | pmd_t pmd; | |
e2cda322 | 120 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); |
f28b6ff8 | 121 | VM_BUG_ON(!pmd_trans_huge(*pmdp)); |
8809aa2d | 122 | pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); |
e2cda322 AA |
123 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
124 | return pmd; | |
125 | } | |
126 | #endif | |
127 | ||
128 | #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH | |
73636b1a CM |
129 | void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, |
130 | pmd_t *pmdp) | |
e2cda322 | 131 | { |
e2cda322 AA |
132 | pmd_t pmd = pmd_mksplitting(*pmdp); |
133 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
134 | set_pmd_at(vma->vm_mm, address, pmdp, pmd); | |
135 | /* tlb flush only to serialize against gup-fast */ | |
136 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); | |
e2cda322 AA |
137 | } |
138 | #endif | |
e3ebcf64 GS |
139 | |
140 | #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT | |
6b0b50b0 AK |
141 | void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, |
142 | pgtable_t pgtable) | |
e3ebcf64 | 143 | { |
c4088ebd | 144 | assert_spin_locked(pmd_lockptr(mm, pmdp)); |
e3ebcf64 GS |
145 | |
146 | /* FIFO */ | |
c389a250 | 147 | if (!pmd_huge_pte(mm, pmdp)) |
e3ebcf64 GS |
148 | INIT_LIST_HEAD(&pgtable->lru); |
149 | else | |
c389a250 KS |
150 | list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru); |
151 | pmd_huge_pte(mm, pmdp) = pgtable; | |
e3ebcf64 | 152 | } |
e3ebcf64 GS |
153 | #endif |
154 | ||
155 | #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW | |
e3ebcf64 | 156 | /* no "address" argument so destroys page coloring of some arch */ |
6b0b50b0 | 157 | pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp) |
e3ebcf64 GS |
158 | { |
159 | pgtable_t pgtable; | |
160 | ||
c4088ebd | 161 | assert_spin_locked(pmd_lockptr(mm, pmdp)); |
e3ebcf64 GS |
162 | |
163 | /* FIFO */ | |
c389a250 | 164 | pgtable = pmd_huge_pte(mm, pmdp); |
e3ebcf64 | 165 | if (list_empty(&pgtable->lru)) |
c389a250 | 166 | pmd_huge_pte(mm, pmdp) = NULL; |
e3ebcf64 | 167 | else { |
c389a250 | 168 | pmd_huge_pte(mm, pmdp) = list_entry(pgtable->lru.next, |
e3ebcf64 GS |
169 | struct page, lru); |
170 | list_del(&pgtable->lru); | |
171 | } | |
172 | return pgtable; | |
173 | } | |
e3ebcf64 | 174 | #endif |
46dcde73 GS |
175 | |
176 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE | |
46dcde73 GS |
177 | void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, |
178 | pmd_t *pmdp) | |
179 | { | |
67f87463 | 180 | pmd_t entry = *pmdp; |
ce8369bc | 181 | set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry)); |
46dcde73 GS |
182 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
183 | } | |
46dcde73 | 184 | #endif |
f28b6ff8 AK |
185 | |
186 | #ifndef pmdp_collapse_flush | |
f28b6ff8 AK |
187 | pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address, |
188 | pmd_t *pmdp) | |
189 | { | |
8809aa2d AK |
190 | /* |
191 | * pmd and hugepage pte format are same. So we could | |
192 | * use the same function. | |
193 | */ | |
f28b6ff8 AK |
194 | pmd_t pmd; |
195 | ||
196 | VM_BUG_ON(address & ~HPAGE_PMD_MASK); | |
197 | VM_BUG_ON(pmd_trans_huge(*pmdp)); | |
8809aa2d | 198 | pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); |
f28b6ff8 AK |
199 | flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
200 | return pmd; | |
201 | } | |
f28b6ff8 | 202 | #endif |
bd5e88ad | 203 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |