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1 // SPDX-License-Identifier: GPL-2.0
5 * Generic pgtable methods declared in linux/pgtable.h
7 * Copyright (C) 2010 Linus Torvalds
10 #include <linux/pagemap.h>
11 #include <linux/hugetlb.h>
12 #include <linux/pgtable.h>
16 * If a p?d_bad entry is found while walking page tables, report
17 * the error, before resetting entry to p?d_none. Usually (but
18 * very seldom) called out from the p?d_none_or_clear_bad macros.
21 void pgd_clear_bad(pgd_t
*pgd
)
27 #ifndef __PAGETABLE_P4D_FOLDED
28 void p4d_clear_bad(p4d_t
*p4d
)
35 #ifndef __PAGETABLE_PUD_FOLDED
36 void pud_clear_bad(pud_t
*pud
)
44 * Note that the pmd variant below can't be stub'ed out just as for p4d/pud
45 * above. pmd folding is special and typically pmd_* macros refer to upper
46 * level even when folded
48 void pmd_clear_bad(pmd_t
*pmd
)
54 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
56 * Only sets the access flags (dirty, accessed), as well as write
57 * permission. Furthermore, we know it always gets set to a "more
58 * permissive" setting, which allows most architectures to optimize
59 * this. We return whether the PTE actually changed, which in turn
60 * instructs the caller to do things like update__mmu_cache. This
61 * used to be done in the caller, but sparc needs minor faults to
62 * force that call on sun4c so we changed this macro slightly
64 int ptep_set_access_flags(struct vm_area_struct
*vma
,
65 unsigned long address
, pte_t
*ptep
,
66 pte_t entry
, int dirty
)
68 int changed
= !pte_same(*ptep
, entry
);
70 set_pte_at(vma
->vm_mm
, address
, ptep
, entry
);
71 flush_tlb_fix_spurious_fault(vma
, address
);
77 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
78 int ptep_clear_flush_young(struct vm_area_struct
*vma
,
79 unsigned long address
, pte_t
*ptep
)
82 young
= ptep_test_and_clear_young(vma
, address
, ptep
);
84 flush_tlb_page(vma
, address
);
89 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
90 pte_t
ptep_clear_flush(struct vm_area_struct
*vma
, unsigned long address
,
93 struct mm_struct
*mm
= (vma
)->vm_mm
;
95 pte
= ptep_get_and_clear(mm
, address
, ptep
);
96 if (pte_accessible(mm
, pte
))
97 flush_tlb_page(vma
, address
);
102 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
104 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
105 int pmdp_set_access_flags(struct vm_area_struct
*vma
,
106 unsigned long address
, pmd_t
*pmdp
,
107 pmd_t entry
, int dirty
)
109 int changed
= !pmd_same(*pmdp
, entry
);
110 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
112 set_pmd_at(vma
->vm_mm
, address
, pmdp
, entry
);
113 flush_pmd_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
119 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
120 int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
121 unsigned long address
, pmd_t
*pmdp
)
124 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
125 young
= pmdp_test_and_clear_young(vma
, address
, pmdp
);
127 flush_pmd_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
132 #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
133 pmd_t
pmdp_huge_clear_flush(struct vm_area_struct
*vma
, unsigned long address
,
137 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
138 VM_BUG_ON(!pmd_present(*pmdp
));
139 /* Below assumes pmd_present() is true */
140 VM_BUG_ON(!pmd_trans_huge(*pmdp
) && !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
);
146 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
147 pud_t
pudp_huge_clear_flush(struct vm_area_struct
*vma
, unsigned long address
,
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
);
161 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
162 void pgtable_trans_huge_deposit(struct mm_struct
*mm
, pmd_t
*pmdp
,
165 assert_spin_locked(pmd_lockptr(mm
, pmdp
));
168 if (!pmd_huge_pte(mm
, pmdp
))
169 INIT_LIST_HEAD(&pgtable
->lru
);
171 list_add(&pgtable
->lru
, &pmd_huge_pte(mm
, pmdp
)->lru
);
172 pmd_huge_pte(mm
, pmdp
) = pgtable
;
176 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
177 /* no "address" argument so destroys page coloring of some arch */
178 pgtable_t
pgtable_trans_huge_withdraw(struct mm_struct
*mm
, pmd_t
*pmdp
)
182 assert_spin_locked(pmd_lockptr(mm
, pmdp
));
185 pgtable
= pmd_huge_pte(mm
, pmdp
);
186 pmd_huge_pte(mm
, pmdp
) = list_first_entry_or_null(&pgtable
->lru
,
188 if (pmd_huge_pte(mm
, pmdp
))
189 list_del(&pgtable
->lru
);
194 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
195 pmd_t
pmdp_invalidate(struct vm_area_struct
*vma
, unsigned long address
,
198 pmd_t old
= pmdp_establish(vma
, address
, pmdp
, pmd_mkinvalid(*pmdp
));
199 flush_pmd_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
204 #ifndef pmdp_collapse_flush
205 pmd_t
pmdp_collapse_flush(struct vm_area_struct
*vma
, unsigned long address
,
209 * pmd and hugepage pte format are same. So we could
210 * use the same function.
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
);
218 /* collapse entails shooting down ptes not pmd */
219 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
223 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */