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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
13#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
14/*
Rik van Rielcef23d92012-11-06 09:56:01 +000015 * Only sets the access flags (dirty, accessed), as well as write
16 * permission. Furthermore, we know it always gets set to a "more
Andrea Arcangelie2cda322011-01-13 15:46:40 -080017 * permissive" setting, which allows most architectures to optimize
18 * this. We return whether the PTE actually changed, which in turn
19 * instructs the caller to do things like update__mmu_cache. This
20 * used to be done in the caller, but sparc needs minor faults to
21 * force that call on sun4c so we changed this macro slightly
22 */
23int ptep_set_access_flags(struct vm_area_struct *vma,
24 unsigned long address, pte_t *ptep,
25 pte_t entry, int dirty)
26{
27 int changed = !pte_same(*ptep, entry);
28 if (changed) {
29 set_pte_at(vma->vm_mm, address, ptep, entry);
Rik van Rielcef23d92012-11-06 09:56:01 +000030 flush_tlb_fix_spurious_fault(vma, address);
Andrea Arcangelie2cda322011-01-13 15:46:40 -080031 }
32 return changed;
33}
34#endif
35
36#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
37int pmdp_set_access_flags(struct vm_area_struct *vma,
38 unsigned long address, pmd_t *pmdp,
39 pmd_t entry, int dirty)
40{
41#ifdef CONFIG_TRANSPARENT_HUGEPAGE
42 int changed = !pmd_same(*pmdp, entry);
43 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
44 if (changed) {
45 set_pmd_at(vma->vm_mm, address, pmdp, entry);
46 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
47 }
48 return changed;
49#else /* CONFIG_TRANSPARENT_HUGEPAGE */
50 BUG();
51 return 0;
52#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
53}
54#endif
55
56#ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
57int ptep_clear_flush_young(struct vm_area_struct *vma,
58 unsigned long address, pte_t *ptep)
59{
60 int young;
61 young = ptep_test_and_clear_young(vma, address, ptep);
62 if (young)
63 flush_tlb_page(vma, address);
64 return young;
65}
66#endif
67
68#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
69int pmdp_clear_flush_young(struct vm_area_struct *vma,
70 unsigned long address, pmd_t *pmdp)
71{
72 int young;
Naoya Horiguchid8c37c42012-03-21 16:34:27 -070073#ifdef CONFIG_TRANSPARENT_HUGEPAGE
74 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
75#else
Andrea Arcangelie2cda322011-01-13 15:46:40 -080076 BUG();
77#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
Andrea Arcangelie2cda322011-01-13 15:46:40 -080078 young = pmdp_test_and_clear_young(vma, address, pmdp);
79 if (young)
80 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
81 return young;
82}
83#endif
84
85#ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
86pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
87 pte_t *ptep)
88{
89 pte_t pte;
90 pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
Rik van Riel8d1acce2012-10-09 15:31:59 +020091 if (pte_accessible(pte))
92 flush_tlb_page(vma, address);
Andrea Arcangelie2cda322011-01-13 15:46:40 -080093 return pte;
94}
95#endif
96
97#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
Andrea Arcangelib3697c02011-01-16 13:10:39 -080098#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Andrea Arcangelie2cda322011-01-13 15:46:40 -080099pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
100 pmd_t *pmdp)
101{
102 pmd_t pmd;
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800103 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
104 pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
105 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
106 return pmd;
107}
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800108#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800109#endif
110
111#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800112#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Chris Metcalf73636b12012-03-28 13:59:18 -0400113void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
114 pmd_t *pmdp)
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800115{
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800116 pmd_t pmd = pmd_mksplitting(*pmdp);
117 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
118 set_pmd_at(vma->vm_mm, address, pmdp, pmd);
119 /* tlb flush only to serialize against gup-fast */
120 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800121}
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800122#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800123#endif
Gerald Schaefere3ebcf642012-10-08 16:30:07 -0700124
125#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
126#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Aneesh Kumar K.V6b0b50b2013-06-05 17:14:02 -0700127void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
128 pgtable_t pgtable)
Gerald Schaefere3ebcf642012-10-08 16:30:07 -0700129{
130 assert_spin_locked(&mm->page_table_lock);
131
132 /* FIFO */
133 if (!mm->pmd_huge_pte)
134 INIT_LIST_HEAD(&pgtable->lru);
135 else
136 list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
137 mm->pmd_huge_pte = pgtable;
138}
139#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
140#endif
141
142#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
143#ifdef CONFIG_TRANSPARENT_HUGEPAGE
144/* no "address" argument so destroys page coloring of some arch */
Aneesh Kumar K.V6b0b50b2013-06-05 17:14:02 -0700145pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
Gerald Schaefere3ebcf642012-10-08 16:30:07 -0700146{
147 pgtable_t pgtable;
148
149 assert_spin_locked(&mm->page_table_lock);
150
151 /* FIFO */
152 pgtable = mm->pmd_huge_pte;
153 if (list_empty(&pgtable->lru))
154 mm->pmd_huge_pte = NULL;
155 else {
156 mm->pmd_huge_pte = list_entry(pgtable->lru.next,
157 struct page, lru);
158 list_del(&pgtable->lru);
159 }
160 return pgtable;
161}
162#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
163#endif
Gerald Schaefer46dcde72012-10-08 16:30:09 -0700164
165#ifndef __HAVE_ARCH_PMDP_INVALIDATE
166#ifdef CONFIG_TRANSPARENT_HUGEPAGE
167void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
168 pmd_t *pmdp)
169{
170 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
171 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
172}
173#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
174#endif