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10#include <linux/pagemap.h>
11#include <linux/hugetlb.h>
12#include <linux/pgtable.h>
13#include <linux/mm_inline.h>
14#include <asm/tlb.h>
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21
22void pgd_clear_bad(pgd_t *pgd)
23{
24 pgd_ERROR(*pgd);
25 pgd_clear(pgd);
26}
27
28#ifndef __PAGETABLE_P4D_FOLDED
29void p4d_clear_bad(p4d_t *p4d)
30{
31 p4d_ERROR(*p4d);
32 p4d_clear(p4d);
33}
34#endif
35
36#ifndef __PAGETABLE_PUD_FOLDED
37void pud_clear_bad(pud_t *pud)
38{
39 pud_ERROR(*pud);
40 pud_clear(pud);
41}
42#endif
43
44
45
46
47
48
49void pmd_clear_bad(pmd_t *pmd)
50{
51 pmd_ERROR(*pmd);
52 pmd_clear(pmd);
53}
54
55#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
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63
64
65int ptep_set_access_flags(struct vm_area_struct *vma,
66 unsigned long address, pte_t *ptep,
67 pte_t entry, int dirty)
68{
69 int changed = !pte_same(*ptep, entry);
70 if (changed) {
71 set_pte_at(vma->vm_mm, address, ptep, entry);
72 flush_tlb_fix_spurious_fault(vma, address);
73 }
74 return changed;
75}
76#endif
77
78#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
79int ptep_clear_flush_young(struct vm_area_struct *vma,
80 unsigned long address, pte_t *ptep)
81{
82 int young;
83 young = ptep_test_and_clear_young(vma, address, ptep);
84 if (young)
85 flush_tlb_page(vma, address);
86 return young;
87}
88#endif
89
90#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
91pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
92 pte_t *ptep)
93{
94 struct mm_struct *mm = (vma)->vm_mm;
95 pte_t pte;
96 pte = ptep_get_and_clear(mm, address, ptep);
97 if (pte_accessible(mm, pte))
98 flush_tlb_page(vma, address);
99 return pte;
100}
101#endif
102
103#ifdef CONFIG_TRANSPARENT_HUGEPAGE
104
105#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
106int pmdp_set_access_flags(struct vm_area_struct *vma,
107 unsigned long address, pmd_t *pmdp,
108 pmd_t entry, int dirty)
109{
110 int changed = !pmd_same(*pmdp, entry);
111 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
112 if (changed) {
113 set_pmd_at(vma->vm_mm, address, pmdp, entry);
114 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
115 }
116 return changed;
117}
118#endif
119
120#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
121int pmdp_clear_flush_young(struct vm_area_struct *vma,
122 unsigned long address, pmd_t *pmdp)
123{
124 int young;
125 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
126 young = pmdp_test_and_clear_young(vma, address, pmdp);
127 if (young)
128 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
129 return young;
130}
131#endif
132
133#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
134pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
135 pmd_t *pmdp)
136{
137 pmd_t pmd;
138 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
139 VM_BUG_ON(pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
140 !pmd_devmap(*pmdp));
141 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
142 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
143 return pmd;
144}
145
146#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
147pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
148 pud_t *pudp)
149{
150 pud_t pud;
151
152 VM_BUG_ON(address & ~HPAGE_PUD_MASK);
153 VM_BUG_ON(!pud_trans_huge(*pudp) && !pud_devmap(*pudp));
154 pud = pudp_huge_get_and_clear(vma->vm_mm, address, pudp);
155 flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
156 return pud;
157}
158#endif
159#endif
160
161#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
162void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
163 pgtable_t pgtable)
164{
165 assert_spin_locked(pmd_lockptr(mm, pmdp));
166
167
168 if (!pmd_huge_pte(mm, pmdp))
169 INIT_LIST_HEAD(&pgtable->lru);
170 else
171 list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
172 pmd_huge_pte(mm, pmdp) = pgtable;
173}
174#endif
175
176#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
177
178pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
179{
180 pgtable_t pgtable;
181
182 assert_spin_locked(pmd_lockptr(mm, pmdp));
183
184
185 pgtable = pmd_huge_pte(mm, pmdp);
186 pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru,
187 struct page, lru);
188 if (pmd_huge_pte(mm, pmdp))
189 list_del(&pgtable->lru);
190 return pgtable;
191}
192#endif
193
194#ifndef __HAVE_ARCH_PMDP_INVALIDATE
195pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
196 pmd_t *pmdp)
197{
198 pmd_t old = pmdp_establish(vma, address, pmdp, pmd_mkinvalid(*pmdp));
199 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
200 return old;
201}
202#endif
203
204#ifndef pmdp_collapse_flush
205pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
206 pmd_t *pmdp)
207{
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211
212 pmd_t pmd;
213
214 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
215 VM_BUG_ON(pmd_trans_huge(*pmdp));
216 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
217
218
219 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
220 return pmd;
221}
222#endif
223#endif
224