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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
19void pgd_clear_bad(pgd_t *pgd)
20{
21 pgd_ERROR(*pgd);
22 pgd_clear(pgd);
23}
24
25void pud_clear_bad(pud_t *pud)
26{
27 pud_ERROR(*pud);
28 pud_clear(pud);
29}
30
31void 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 */
47int 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
61int 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
81int 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
93int 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
110pte_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
124pmd_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
138void 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
152void 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 */
170pgtable_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
192void 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
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * mm/pgtable-generic.c
4 *
5 * Generic pgtable methods declared in linux/pgtable.h
6 *
7 * Copyright (C) 2010 Linus Torvalds
8 */
9
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>
15
16/*
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.
20 */
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 * 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
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
56/*
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
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 /* FIFO */
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/* no "address" argument so destroys page coloring of some arch */
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 /* FIFO */
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 __HAVE_ARCH_PMDP_INVALIDATE_AD
205pmd_t pmdp_invalidate_ad(struct vm_area_struct *vma, unsigned long address,
206 pmd_t *pmdp)
207{
208 return pmdp_invalidate(vma, address, pmdp);
209}
210#endif
211
212#ifndef pmdp_collapse_flush
213pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
214 pmd_t *pmdp)
215{
216 /*
217 * pmd and hugepage pte format are same. So we could
218 * use the same function.
219 */
220 pmd_t pmd;
221
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);
225
226 /* collapse entails shooting down ptes not pmd */
227 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
228 return pmd;
229}
230#endif
231#endif /* CONFIG_TRANSPARENT_HUGEPAGE */