Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0
2
3#include <asm/pgalloc.h>
4#include <linux/gfp.h>
5#include <linux/kernel.h>
6#include <linux/pgtable.h>
7
8int ptep_set_access_flags(struct vm_area_struct *vma,
9 unsigned long address, pte_t *ptep,
10 pte_t entry, int dirty)
11{
12 if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SVVPTC)) {
13 if (!pte_same(ptep_get(ptep), entry)) {
14 __set_pte_at(vma->vm_mm, ptep, entry);
15 /* Here only not svadu is impacted */
16 flush_tlb_page(vma, address);
17 return true;
18 }
19
20 return false;
21 }
22
23 if (!pte_same(ptep_get(ptep), entry))
24 __set_pte_at(vma->vm_mm, ptep, entry);
25 /*
26 * update_mmu_cache will unconditionally execute, handling both
27 * the case that the PTE changed and the spurious fault case.
28 */
29 return true;
30}
31
32int ptep_test_and_clear_young(struct vm_area_struct *vma,
33 unsigned long address,
34 pte_t *ptep)
35{
36 if (!pte_young(ptep_get(ptep)))
37 return 0;
38 return test_and_clear_bit(_PAGE_ACCESSED_OFFSET, &pte_val(*ptep));
39}
40EXPORT_SYMBOL_GPL(ptep_test_and_clear_young);
41
42#ifdef CONFIG_64BIT
43pud_t *pud_offset(p4d_t *p4d, unsigned long address)
44{
45 if (pgtable_l4_enabled)
46 return p4d_pgtable(p4dp_get(p4d)) + pud_index(address);
47
48 return (pud_t *)p4d;
49}
50
51p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
52{
53 if (pgtable_l5_enabled)
54 return pgd_pgtable(pgdp_get(pgd)) + p4d_index(address);
55
56 return (p4d_t *)pgd;
57}
58#endif
59
60#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
61int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
62{
63 return 0;
64}
65
66void p4d_clear_huge(p4d_t *p4d)
67{
68}
69
70int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
71{
72 pud_t new_pud = pfn_pud(__phys_to_pfn(phys), prot);
73
74 set_pud(pud, new_pud);
75 return 1;
76}
77
78int pud_clear_huge(pud_t *pud)
79{
80 if (!pud_leaf(pudp_get(pud)))
81 return 0;
82 pud_clear(pud);
83 return 1;
84}
85
86int pud_free_pmd_page(pud_t *pud, unsigned long addr)
87{
88 pmd_t *pmd = pud_pgtable(pudp_get(pud));
89 int i;
90
91 pud_clear(pud);
92
93 flush_tlb_kernel_range(addr, addr + PUD_SIZE);
94
95 for (i = 0; i < PTRS_PER_PMD; i++) {
96 if (!pmd_none(pmd[i])) {
97 pte_t *pte = (pte_t *)pmd_page_vaddr(pmd[i]);
98
99 pte_free_kernel(NULL, pte);
100 }
101 }
102
103 pmd_free(NULL, pmd);
104
105 return 1;
106}
107
108int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)
109{
110 pmd_t new_pmd = pfn_pmd(__phys_to_pfn(phys), prot);
111
112 set_pmd(pmd, new_pmd);
113 return 1;
114}
115
116int pmd_clear_huge(pmd_t *pmd)
117{
118 if (!pmd_leaf(pmdp_get(pmd)))
119 return 0;
120 pmd_clear(pmd);
121 return 1;
122}
123
124int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
125{
126 pte_t *pte = (pte_t *)pmd_page_vaddr(pmdp_get(pmd));
127
128 pmd_clear(pmd);
129
130 flush_tlb_kernel_range(addr, addr + PMD_SIZE);
131 pte_free_kernel(NULL, pte);
132 return 1;
133}
134
135#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
136#ifdef CONFIG_TRANSPARENT_HUGEPAGE
137pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
138 unsigned long address, pmd_t *pmdp)
139{
140 pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
141
142 VM_BUG_ON(address & ~HPAGE_PMD_MASK);
143 VM_BUG_ON(pmd_trans_huge(pmdp_get(pmdp)));
144 /*
145 * When leaf PTE entries (regular pages) are collapsed into a leaf
146 * PMD entry (huge page), a valid non-leaf PTE is converted into a
147 * valid leaf PTE at the level 1 page table. Since the sfence.vma
148 * forms that specify an address only apply to leaf PTEs, we need a
149 * global flush here. collapse_huge_page() assumes these flushes are
150 * eager, so just do the fence here.
151 */
152 flush_tlb_mm(vma->vm_mm);
153 return pmd;
154}
155
156pud_t pudp_invalidate(struct vm_area_struct *vma, unsigned long address,
157 pud_t *pudp)
158{
159 VM_WARN_ON_ONCE(!pud_present(*pudp));
160 pud_t old = pudp_establish(vma, address, pudp, pud_mkinvalid(*pudp));
161
162 flush_pud_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
163 return old;
164}
165#endif /* CONFIG_TRANSPARENT_HUGEPAGE */