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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/*
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;
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);
91 flush_tlb_page(vma, address);
92 return pte;
93}
94#endif
95
96#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
Andrea Arcangelib3697c02011-01-16 13:10:39 -080097#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Andrea Arcangelie2cda322011-01-13 15:46:40 -080098pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
99 pmd_t *pmdp)
100{
101 pmd_t pmd;
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800102 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}
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800107#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800108#endif
109
110#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800111#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Chris Metcalf73636b12012-03-28 13:59:18 -0400112void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
113 pmd_t *pmdp)
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800114{
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800115 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);
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800120}
Andrea Arcangelib3697c02011-01-16 13:10:39 -0800121#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
Andrea Arcangelie2cda322011-01-13 15:46:40 -0800122#endif