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git.ipfire.org Git - thirdparty/linux.git/blob - mm/pgtable-generic.c
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>
13 #include <linux/mm_inline.h>
17 * If a p?d_bad entry is found while walking page tables, report
18 * the error, before resetting entry to p?d_none. Usually (but
19 * very seldom) called out from the p?d_none_or_clear_bad macros.
22 void pgd_clear_bad(pgd_t
*pgd
)
28 #ifndef __PAGETABLE_P4D_FOLDED
29 void p4d_clear_bad(p4d_t
*p4d
)
36 #ifndef __PAGETABLE_PUD_FOLDED
37 void pud_clear_bad(pud_t
*pud
)
45 * Note that the pmd variant below can't be stub'ed out just as for p4d/pud
46 * above. pmd folding is special and typically pmd_* macros refer to upper
47 * level even when folded
49 void pmd_clear_bad(pmd_t
*pmd
)
55 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
57 * Only sets the access flags (dirty, accessed), as well as write
58 * permission. Furthermore, we know it always gets set to a "more
59 * permissive" setting, which allows most architectures to optimize
60 * this. We return whether the PTE actually changed, which in turn
61 * instructs the caller to do things like update__mmu_cache. This
62 * used to be done in the caller, but sparc needs minor faults to
63 * force that call on sun4c so we changed this macro slightly
65 int ptep_set_access_flags(struct vm_area_struct
*vma
,
66 unsigned long address
, pte_t
*ptep
,
67 pte_t entry
, int dirty
)
69 int changed
= !pte_same(*ptep
, entry
);
71 set_pte_at(vma
->vm_mm
, address
, ptep
, entry
);
72 flush_tlb_fix_spurious_fault(vma
, address
);
78 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
79 int ptep_clear_flush_young(struct vm_area_struct
*vma
,
80 unsigned long address
, pte_t
*ptep
)
83 young
= ptep_test_and_clear_young(vma
, address
, ptep
);
85 flush_tlb_page(vma
, address
);
90 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
91 pte_t
ptep_clear_flush(struct vm_area_struct
*vma
, unsigned long address
,
94 struct mm_struct
*mm
= (vma
)->vm_mm
;
96 pte
= ptep_get_and_clear(mm
, address
, ptep
);
97 if (pte_accessible(mm
, pte
))
98 flush_tlb_page(vma
, address
);
103 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
105 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
106 int pmdp_set_access_flags(struct vm_area_struct
*vma
,
107 unsigned long address
, pmd_t
*pmdp
,
108 pmd_t entry
, int dirty
)
110 int changed
= !pmd_same(*pmdp
, entry
);
111 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
113 set_pmd_at(vma
->vm_mm
, address
, pmdp
, entry
);
114 flush_pmd_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
120 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
121 int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
122 unsigned long address
, pmd_t
*pmdp
)
125 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
126 young
= pmdp_test_and_clear_young(vma
, address
, pmdp
);
128 flush_pmd_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
133 #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
134 pmd_t
pmdp_huge_clear_flush(struct vm_area_struct
*vma
, unsigned long address
,
138 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
139 VM_BUG_ON(pmd_present(*pmdp
) && !pmd_trans_huge(*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 __HAVE_ARCH_PMDP_INVALIDATE_AD
205 pmd_t
pmdp_invalidate_ad(struct vm_area_struct
*vma
, unsigned long address
,
208 return pmdp_invalidate(vma
, address
, pmdp
);
212 #ifndef pmdp_collapse_flush
213 pmd_t
pmdp_collapse_flush(struct vm_area_struct
*vma
, unsigned long address
,
217 * pmd and hugepage pte format are same. So we could
218 * use the same function.
222 VM_BUG_ON(address
& ~HPAGE_PMD_MASK
);
223 VM_BUG_ON(pmd_trans_huge(*pmdp
));
224 pmd
= pmdp_huge_get_and_clear(vma
->vm_mm
, address
, pmdp
);
226 /* collapse entails shooting down ptes not pmd */
227 flush_tlb_range(vma
, address
, address
+ HPAGE_PMD_SIZE
);
231 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */