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Andrea Arcangelie2cda322011-01-13 15:46:40 -08001/*
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
Andrew Mortonf95ba942011-01-25 15:07:11 -08009#include <linux/pagemap.h>
Andrea Arcangelie2cda322011-01-13 15:46:40 -080010#include <asm/tlb.h>
11#include <asm-generic/pgtable.h>
12
Joonsoo Kimbc4b4442013-09-11 14:21:28 -070013/*
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
Andrea Arcangelie2cda322011-01-13 15:46:40 -080037#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
38/*
Rik van Rielcef23d92012-11-06 09:56:01 +000039 * Only sets the access flags (dirty, accessed), as well as write
40 * permission. Furthermore, we know it always gets set to a "more
Andrea Arcangelie2cda322011-01-13 15:46:40 -080041 * 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);
Rik van Rielcef23d92012-11-06 09:56:01 +000054 flush_tlb_fix_spurious_fault(vma, address);
Andrea Arcangelie2cda322011-01-13 15:46:40 -080055 }
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;
Naoya Horiguchid8c37c42012-03-21 16:34:27 -070097#ifdef CONFIG_TRANSPARENT_HUGEPAGE
98 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
99#else
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800100 BUG();
101#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800102 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{
Rik van Riel20841402013-12-18 17:08:44 -0800113 struct mm_struct *mm = (vma)->vm_mm;
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800114 pte_t pte;
Rik van Riel20841402013-12-18 17:08:44 -0800115 pte = ptep_get_and_clear(mm, address, ptep);
116 if (pte_accessible(mm, pte))
Rik van Riel8d1acce2012-10-09 15:31:59 +0200117 flush_tlb_page(vma, address);
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800118 return pte;
119}
120#endif
121
122#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800123#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800124pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
125 pmd_t *pmdp)
126{
127 pmd_t pmd;
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800128 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}
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800133#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800134#endif
135
136#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800137#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Chris Metcalf73636b12012-03-28 13:59:18 -0400138void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
139 pmd_t *pmdp)
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800140{
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800141 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);
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800146}
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800147#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800148#endif
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700149
150#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
151#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Aneesh Kumar K.V6b0b50b2013-06-05 17:14:02 -0700152void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
153 pgtable_t pgtable)
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700154{
Kirill A. Shutemovc4088eb2013-11-14 14:31:04 -0800155 assert_spin_locked(pmd_lockptr(mm, pmdp));
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700156
157 /* FIFO */
Kirill A. Shutemovc389a252013-11-14 14:30:59 -0800158 if (!pmd_huge_pte(mm, pmdp))
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700159 INIT_LIST_HEAD(&pgtable->lru);
160 else
Kirill A. Shutemovc389a252013-11-14 14:30:59 -0800161 list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
162 pmd_huge_pte(mm, pmdp) = pgtable;
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700163}
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 */
Aneesh Kumar K.V6b0b50b2013-06-05 17:14:02 -0700170pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700171{
172 pgtable_t pgtable;
173
Kirill A. Shutemovc4088eb2013-11-14 14:31:04 -0800174 assert_spin_locked(pmd_lockptr(mm, pmdp));
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700175
176 /* FIFO */
Kirill A. Shutemovc389a252013-11-14 14:30:59 -0800177 pgtable = pmd_huge_pte(mm, pmdp);
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700178 if (list_empty(&pgtable->lru))
Kirill A. Shutemovc389a252013-11-14 14:30:59 -0800179 pmd_huge_pte(mm, pmdp) = NULL;
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700180 else {
Kirill A. Shutemovc389a252013-11-14 14:30:59 -0800181 pmd_huge_pte(mm, pmdp) = list_entry(pgtable->lru.next,
Gerald Schaefere3ebcf62012-10-08 16:30:07 -0700182 struct page, lru);
183 list_del(&pgtable->lru);
184 }
185 return pgtable;
186}
187#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
188#endif
Gerald Schaefer46dcde72012-10-08 16:30:09 -0700189
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{
Mel Gorman67f87462013-12-18 17:08:34 -0800195 pmd_t entry = *pmdp;
Matthew Wilcoxce8369b2014-08-29 15:18:33 -0700196 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
Gerald Schaefer46dcde72012-10-08 16:30:09 -0700197 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
198}
199#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
200#endif