~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/mm/pgtable-generic.c

Version: ~ [ linux-5.13-rc5 ] ~ [ linux-5.12.9 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.42 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.124 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.193 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.235 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.271 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.271 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  mm/pgtable-generic.c
  4  *
  5  *  Generic pgtable methods declared in asm-generic/pgtable.h
  6  *
  7  *  Copyright (C) 2010  Linus Torvalds
  8  */
  9 
 10 #include <linux/pagemap.h>
 11 #include <linux/hugetlb.h>
 12 #include <asm/tlb.h>
 13 #include <asm-generic/pgtable.h>
 14 
 15 /*
 16  * If a p?d_bad entry is found while walking page tables, report
 17  * the error, before resetting entry to p?d_none.  Usually (but
 18  * very seldom) called out from the p?d_none_or_clear_bad macros.
 19  */
 20 
 21 void pgd_clear_bad(pgd_t *pgd)
 22 {
 23         pgd_ERROR(*pgd);
 24         pgd_clear(pgd);
 25 }
 26 
 27 #ifndef __PAGETABLE_P4D_FOLDED
 28 void p4d_clear_bad(p4d_t *p4d)
 29 {
 30         p4d_ERROR(*p4d);
 31         p4d_clear(p4d);
 32 }
 33 #endif
 34 
 35 #ifndef __PAGETABLE_PUD_FOLDED
 36 void pud_clear_bad(pud_t *pud)
 37 {
 38         pud_ERROR(*pud);
 39         pud_clear(pud);
 40 }
 41 #endif
 42 
 43 /*
 44  * Note that the pmd variant below can't be stub'ed out just as for p4d/pud
 45  * above. pmd folding is special and typically pmd_* macros refer to upper
 46  * level even when folded
 47  */
 48 void pmd_clear_bad(pmd_t *pmd)
 49 {
 50         pmd_ERROR(*pmd);
 51         pmd_clear(pmd);
 52 }
 53 
 54 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 55 /*
 56  * Only sets the access flags (dirty, accessed), as well as write 
 57  * permission. Furthermore, we know it always gets set to a "more
 58  * permissive" setting, which allows most architectures to optimize
 59  * this. We return whether the PTE actually changed, which in turn
 60  * instructs the caller to do things like update__mmu_cache.  This
 61  * used to be done in the caller, but sparc needs minor faults to
 62  * force that call on sun4c so we changed this macro slightly
 63  */
 64 int ptep_set_access_flags(struct vm_area_struct *vma,
 65                           unsigned long address, pte_t *ptep,
 66                           pte_t entry, int dirty)
 67 {
 68         int changed = !pte_same(*ptep, entry);
 69         if (changed) {
 70                 set_pte_at(vma->vm_mm, address, ptep, entry);
 71                 flush_tlb_fix_spurious_fault(vma, address);
 72         }
 73         return changed;
 74 }
 75 #endif
 76 
 77 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 78 int ptep_clear_flush_young(struct vm_area_struct *vma,
 79                            unsigned long address, pte_t *ptep)
 80 {
 81         int young;
 82         young = ptep_test_and_clear_young(vma, address, ptep);
 83         if (young)
 84                 flush_tlb_page(vma, address);
 85         return young;
 86 }
 87 #endif
 88 
 89 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
 90 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
 91                        pte_t *ptep)
 92 {
 93         struct mm_struct *mm = (vma)->vm_mm;
 94         pte_t pte;
 95         pte = ptep_get_and_clear(mm, address, ptep);
 96         if (pte_accessible(mm, pte))
 97                 flush_tlb_page(vma, address);
 98         return pte;
 99 }
100 #endif
101 
102 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
103 
104 #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
105 int pmdp_set_access_flags(struct vm_area_struct *vma,
106                           unsigned long address, pmd_t *pmdp,
107                           pmd_t entry, int dirty)
108 {
109         int changed = !pmd_same(*pmdp, entry);
110         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
111         if (changed) {
112                 set_pmd_at(vma->vm_mm, address, pmdp, entry);
113                 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
114         }
115         return changed;
116 }
117 #endif
118 
119 #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
120 int pmdp_clear_flush_young(struct vm_area_struct *vma,
121                            unsigned long address, pmd_t *pmdp)
122 {
123         int young;
124         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
125         young = pmdp_test_and_clear_young(vma, address, pmdp);
126         if (young)
127                 flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
128         return young;
129 }
130 #endif
131 
132 #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
133 pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
134                             pmd_t *pmdp)
135 {
136         pmd_t pmd;
137         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
138         VM_BUG_ON((pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
139                            !pmd_devmap(*pmdp)) || !pmd_present(*pmdp));
140         pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
141         flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
142         return pmd;
143 }
144 
145 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
146 pud_t pudp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
147                             pud_t *pudp)
148 {
149         pud_t pud;
150 
151         VM_BUG_ON(address & ~HPAGE_PUD_MASK);
152         VM_BUG_ON(!pud_trans_huge(*pudp) && !pud_devmap(*pudp));
153         pud = pudp_huge_get_and_clear(vma->vm_mm, address, pudp);
154         flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
155         return pud;
156 }
157 #endif
158 #endif
159 
160 #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
161 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
162                                 pgtable_t pgtable)
163 {
164         assert_spin_locked(pmd_lockptr(mm, pmdp));
165 
166         /* FIFO */
167         if (!pmd_huge_pte(mm, pmdp))
168                 INIT_LIST_HEAD(&pgtable->lru);
169         else
170                 list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
171         pmd_huge_pte(mm, pmdp) = pgtable;
172 }
173 #endif
174 
175 #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
176 /* no "address" argument so destroys page coloring of some arch */
177 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
178 {
179         pgtable_t pgtable;
180 
181         assert_spin_locked(pmd_lockptr(mm, pmdp));
182 
183         /* FIFO */
184         pgtable = pmd_huge_pte(mm, pmdp);
185         pmd_huge_pte(mm, pmdp) = list_first_entry_or_null(&pgtable->lru,
186                                                           struct page, lru);
187         if (pmd_huge_pte(mm, pmdp))
188                 list_del(&pgtable->lru);
189         return pgtable;
190 }
191 #endif
192 
193 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
194 pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
195                      pmd_t *pmdp)
196 {
197         pmd_t old = pmdp_establish(vma, address, pmdp, pmd_mknotpresent(*pmdp));
198         flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
199         return old;
200 }
201 #endif
202 
203 #ifndef pmdp_collapse_flush
204 pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
205                           pmd_t *pmdp)
206 {
207         /*
208          * pmd and hugepage pte format are same. So we could
209          * use the same function.
210          */
211         pmd_t pmd;
212 
213         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
214         VM_BUG_ON(pmd_trans_huge(*pmdp));
215         pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
216 
217         /* collapse entails shooting down ptes not pmd */
218         flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
219         return pmd;
220 }
221 #endif
222 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
223 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp