projects/linux·blob v3.7 · refs

172 lines · 4.5 KiB

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#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
14/*
15 * Only sets the access flags (dirty, accessed, and
16 * writable). Furthermore, we know it always gets set to a "more
17 * 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);
30 flush_tlb_page(vma, address);
31 }
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;
73#ifdef CONFIG_TRANSPARENT_HUGEPAGE
74 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
75#else
76 BUG();
77#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
78 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);
91 flush_tlb_page(vma, address);
92 return pte;
93}
94#endif
95
96#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
97#ifdef CONFIG_TRANSPARENT_HUGEPAGE
98pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
99 pmd_t *pmdp)
100{
101 pmd_t pmd;
102 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
103 pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
104 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
105 return pmd;
106}
107#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
108#endif
109
110#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
111#ifdef CONFIG_TRANSPARENT_HUGEPAGE
112void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
113 pmd_t *pmdp)
114{
115 pmd_t pmd = pmd_mksplitting(*pmdp);
116 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
117 set_pmd_at(vma->vm_mm, address, pmdp, pmd);
118 /* tlb flush only to serialize against gup-fast */
119 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
120}
121#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
122#endif
123
124#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
125#ifdef CONFIG_TRANSPARENT_HUGEPAGE
126void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable)
127{
128 assert_spin_locked(&mm->page_table_lock);
129
130 /* FIFO */
131 if (!mm->pmd_huge_pte)
132 INIT_LIST_HEAD(&pgtable->lru);
133 else
134 list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
135 mm->pmd_huge_pte = pgtable;
136}
137#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
138#endif
139
140#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
141#ifdef CONFIG_TRANSPARENT_HUGEPAGE
142/* no "address" argument so destroys page coloring of some arch */
143pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm)
144{
145 pgtable_t pgtable;
146
147 assert_spin_locked(&mm->page_table_lock);
148
149 /* FIFO */
150 pgtable = mm->pmd_huge_pte;
151 if (list_empty(&pgtable->lru))
152 mm->pmd_huge_pte = NULL;
153 else {
154 mm->pmd_huge_pte = list_entry(pgtable->lru.next,
155 struct page, lru);
156 list_del(&pgtable->lru);
157 }
158 return pgtable;
159}
160#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
161#endif
162
163#ifndef __HAVE_ARCH_PMDP_INVALIDATE
164#ifdef CONFIG_TRANSPARENT_HUGEPAGE
165void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
166 pmd_t *pmdp)
167{
168 set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
169 flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
170}
171#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
172#endif