Root/mm/pgtable-generic.c

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/*
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
37#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
38/*
39 * Only sets the access flags (dirty, accessed), as well as write
40 * permission. Furthermore, we know it always gets set to a "more
41 * 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);
54        flush_tlb_fix_spurious_fault(vma, address);
55    }
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;
97#ifdef CONFIG_TRANSPARENT_HUGEPAGE
98    VM_BUG_ON(address & ~HPAGE_PMD_MASK);
99#else
100    BUG();
101#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
102    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{
113    pte_t pte;
114    pte = ptep_get_and_clear((vma)->vm_mm, address, ptep);
115    if (pte_accessible(pte))
116        flush_tlb_page(vma, address);
117    return pte;
118}
119#endif
120
121#ifndef __HAVE_ARCH_PMDP_CLEAR_FLUSH
122#ifdef CONFIG_TRANSPARENT_HUGEPAGE
123pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
124               pmd_t *pmdp)
125{
126    pmd_t pmd;
127    VM_BUG_ON(address & ~HPAGE_PMD_MASK);
128    pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
129    flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
130    return pmd;
131}
132#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
133#endif
134
135#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
136#ifdef CONFIG_TRANSPARENT_HUGEPAGE
137void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
138              pmd_t *pmdp)
139{
140    pmd_t pmd = pmd_mksplitting(*pmdp);
141    VM_BUG_ON(address & ~HPAGE_PMD_MASK);
142    set_pmd_at(vma->vm_mm, address, pmdp, pmd);
143    /* tlb flush only to serialize against gup-fast */
144    flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
145}
146#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
147#endif
148
149#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
150#ifdef CONFIG_TRANSPARENT_HUGEPAGE
151void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
152                pgtable_t pgtable)
153{
154    assert_spin_locked(&mm->page_table_lock);
155
156    /* FIFO */
157    if (!mm->pmd_huge_pte)
158        INIT_LIST_HEAD(&pgtable->lru);
159    else
160        list_add(&pgtable->lru, &mm->pmd_huge_pte->lru);
161    mm->pmd_huge_pte = pgtable;
162}
163#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
164#endif
165
166#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
167#ifdef CONFIG_TRANSPARENT_HUGEPAGE
168/* no "address" argument so destroys page coloring of some arch */
169pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
170{
171    pgtable_t pgtable;
172
173    assert_spin_locked(&mm->page_table_lock);
174
175    /* FIFO */
176    pgtable = mm->pmd_huge_pte;
177    if (list_empty(&pgtable->lru))
178        mm->pmd_huge_pte = NULL;
179    else {
180        mm->pmd_huge_pte = list_entry(pgtable->lru.next,
181                          struct page, lru);
182        list_del(&pgtable->lru);
183    }
184    return pgtable;
185}
186#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
187#endif
188
189#ifndef __HAVE_ARCH_PMDP_INVALIDATE
190#ifdef CONFIG_TRANSPARENT_HUGEPAGE
191void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
192             pmd_t *pmdp)
193{
194    set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
195    flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
196}
197#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
198#endif
199

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