Merge tag 'char-misc-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[linux-2.6-block.git] / mm / pgtable-generic.c
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b2441318 1// SPDX-License-Identifier: GPL-2.0
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2/*
3 * mm/pgtable-generic.c
4 *
5 * Generic pgtable methods declared in asm-generic/pgtable.h
6 *
7 * Copyright (C) 2010 Linus Torvalds
8 */
9
f95ba941 10#include <linux/pagemap.h>
a31acd3e 11#include <linux/hugetlb.h>
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12#include <asm/tlb.h>
13#include <asm-generic/pgtable.h>
14
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15/*
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.
19 */
20
21void pgd_clear_bad(pgd_t *pgd)
22{
23 pgd_ERROR(*pgd);
24 pgd_clear(pgd);
25}
26
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27void p4d_clear_bad(p4d_t *p4d)
28{
29 p4d_ERROR(*p4d);
30 p4d_clear(p4d);
31}
32
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33void pud_clear_bad(pud_t *pud)
34{
35 pud_ERROR(*pud);
36 pud_clear(pud);
37}
38
39void pmd_clear_bad(pmd_t *pmd)
40{
41 pmd_ERROR(*pmd);
42 pmd_clear(pmd);
43}
44
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45#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
46/*
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47 * Only sets the access flags (dirty, accessed), as well as write
48 * permission. Furthermore, we know it always gets set to a "more
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49 * permissive" setting, which allows most architectures to optimize
50 * this. We return whether the PTE actually changed, which in turn
51 * instructs the caller to do things like update__mmu_cache. This
52 * used to be done in the caller, but sparc needs minor faults to
53 * force that call on sun4c so we changed this macro slightly
54 */
55int ptep_set_access_flags(struct vm_area_struct *vma,
56 unsigned long address, pte_t *ptep,
57 pte_t entry, int dirty)
58{
59 int changed = !pte_same(*ptep, entry);
60 if (changed) {
61 set_pte_at(vma->vm_mm, address, ptep, entry);
cef23d9d 62 flush_tlb_fix_spurious_fault(vma, address);
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63 }
64 return changed;
65}
66#endif
67
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68#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
69int ptep_clear_flush_young(struct vm_area_struct *vma,
70 unsigned long address, pte_t *ptep)
71{
72 int young;
73 young = ptep_test_and_clear_young(vma, address, ptep);
74 if (young)
75 flush_tlb_page(vma, address);
76 return young;
77}
78#endif
79
80#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
81pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
82 pte_t *ptep)
83{
84 struct mm_struct *mm = (vma)->vm_mm;
85 pte_t pte;
86 pte = ptep_get_and_clear(mm, address, ptep);
87 if (pte_accessible(mm, pte))
88 flush_tlb_page(vma, address);
89 return pte;
90}
91#endif
92
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93#ifdef CONFIG_TRANSPARENT_HUGEPAGE
94
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95#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
96int pmdp_set_access_flags(struct vm_area_struct *vma,
97 unsigned long address, pmd_t *pmdp,
98 pmd_t entry, int dirty)
99{
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100 int changed = !pmd_same(*pmdp, entry);
101 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
102 if (changed) {
103 set_pmd_at(vma->vm_mm, address, pmdp, entry);
12ebc158 104 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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105 }
106 return changed;
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107}
108#endif
109
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110#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
111int pmdp_clear_flush_young(struct vm_area_struct *vma,
112 unsigned long address, pmd_t *pmdp)
113{
114 int young;
d8c37c48 115 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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116 young = pmdp_test_and_clear_young(vma, address, pmdp);
117 if (young)
12ebc158 118 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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119 return young;
120}
121#endif
122
8809aa2d 123#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
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124pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
125 pmd_t *pmdp)
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126{
127 pmd_t pmd;
e2cda322 128 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
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129 VM_BUG_ON((pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
130 !pmd_devmap(*pmdp)) || !pmd_present(*pmdp));
8809aa2d 131 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
12ebc158 132 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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133 return pmd;
134}
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135
136#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
137pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
138 pud_t *pudp)
139{
140 pud_t pud;
141
142 VM_BUG_ON(address & ~HPAGE_PUD_MASK);
143 VM_BUG_ON(!pud_trans_huge(*pudp) && !pud_devmap(*pudp));
144 pud = pudp_huge_get_and_clear(vma->vm_mm, address, pudp);
145 flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
146 return pud;
147}
148#endif
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149#endif
150
e3ebcf64 151#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
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152void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
153 pgtable_t pgtable)
e3ebcf64 154{
c4088ebd 155 assert_spin_locked(pmd_lockptr(mm, pmdp));
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156
157 /* FIFO */
c389a250 158 if (!pmd_huge_pte(mm, pmdp))
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159 INIT_LIST_HEAD(&pgtable->lru);
160 else
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161 list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
162 pmd_huge_pte(mm, pmdp) = pgtable;
e3ebcf64 163}
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164#endif
165
166#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
e3ebcf64 167/* no "address" argument so destroys page coloring of some arch */
6b0b50b0 168pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
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169{
170 pgtable_t pgtable;
171
c4088ebd 172 assert_spin_locked(pmd_lockptr(mm, pmdp));
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173
174 /* FIFO */
c389a250 175 pgtable = pmd_huge_pte(mm, pmdp);
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176 pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru,
177 struct page, lru);
178 if (pmd_huge_pte(mm, pmdp))
e3ebcf64 179 list_del(&pgtable->lru);
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180 return pgtable;
181}
e3ebcf64 182#endif
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183
184#ifndef __HAVE_ARCH_PMDP_INVALIDATE
d52605d7 185pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
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186 pmd_t *pmdp)
187{
d52605d7 188 pmd_t old = pmdp_establish(vma, address, pmdp, pmd_mknotpresent(*pmdp));
12ebc158 189 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
d52605d7 190 return old;
46dcde73 191}
46dcde73 192#endif
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193
194#ifndef pmdp_collapse_flush
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195pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
196 pmd_t *pmdp)
197{
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198 /*
199 * pmd and hugepage pte format are same. So we could
200 * use the same function.
201 */
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202 pmd_t pmd;
203
204 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
205 VM_BUG_ON(pmd_trans_huge(*pmdp));
8809aa2d 206 pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
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207
208 /* collapse entails shooting down ptes not pmd */
209 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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210 return pmd;
211}
f28b6ff8 212#endif
bd5e88ad 213#endif /* CONFIG_TRANSPARENT_HUGEPAGE */