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 */
ptep_set_access_flags(struct vm_area_struct * vma,unsigned long address,pte_t * ptep,pte_t entry,int dirty)23 int 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
pmdp_set_access_flags(struct vm_area_struct * vma,unsigned long address,pmd_t * pmdp,pmd_t entry,int dirty)37 int 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
ptep_clear_flush_young(struct vm_area_struct * vma,unsigned long address,pte_t * ptep)57 int 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
pmdp_clear_flush_young(struct vm_area_struct * vma,unsigned long address,pmd_t * pmdp)69 int 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
ptep_clear_flush(struct vm_area_struct * vma,unsigned long address,pte_t * ptep)86 pte_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
pmdp_clear_flush(struct vm_area_struct * vma,unsigned long address,pmd_t * pmdp)98 pmd_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
pmdp_splitting_flush(struct vm_area_struct * vma,unsigned long address,pmd_t * pmdp)112 pmd_t 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