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1 | #include <linux/mm.h> |
2 | #include <linux/highmem.h> |
3 | #include <linux/sched.h> |
4 | #include <linux/hugetlb.h> |
5 | |
6 | static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
7 | struct mm_walk *walk) |
8 | { |
9 | pte_t *pte; |
10 | int err = 0; |
11 | |
12 | pte = pte_offset_map(pmd, addr); |
13 | for (;;) { |
14 | err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk); |
15 | if (err) |
16 | break; |
17 | addr += PAGE_SIZE; |
18 | if (addr == end) |
19 | break; |
20 | pte++; |
21 | } |
22 | |
23 | pte_unmap(pte); |
24 | return err; |
25 | } |
26 | |
27 | static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, |
28 | struct mm_walk *walk) |
29 | { |
30 | pmd_t *pmd; |
31 | unsigned long next; |
32 | int err = 0; |
33 | |
34 | pmd = pmd_offset(pud, addr); |
35 | do { |
36 | next = pmd_addr_end(addr, end); |
37 | split_huge_page_pmd(walk->mm, pmd); |
38 | if (pmd_none_or_clear_bad(pmd)) { |
39 | if (walk->pte_hole) |
40 | err = walk->pte_hole(addr, next, walk); |
41 | if (err) |
42 | break; |
43 | continue; |
44 | } |
45 | if (walk->pmd_entry) |
46 | err = walk->pmd_entry(pmd, addr, next, walk); |
47 | if (!err && walk->pte_entry) |
48 | err = walk_pte_range(pmd, addr, next, walk); |
49 | if (err) |
50 | break; |
51 | } while (pmd++, addr = next, addr != end); |
52 | |
53 | return err; |
54 | } |
55 | |
56 | static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end, |
57 | struct mm_walk *walk) |
58 | { |
59 | pud_t *pud; |
60 | unsigned long next; |
61 | int err = 0; |
62 | |
63 | pud = pud_offset(pgd, addr); |
64 | do { |
65 | next = pud_addr_end(addr, end); |
66 | if (pud_none_or_clear_bad(pud)) { |
67 | if (walk->pte_hole) |
68 | err = walk->pte_hole(addr, next, walk); |
69 | if (err) |
70 | break; |
71 | continue; |
72 | } |
73 | if (walk->pud_entry) |
74 | err = walk->pud_entry(pud, addr, next, walk); |
75 | if (!err && (walk->pmd_entry || walk->pte_entry)) |
76 | err = walk_pmd_range(pud, addr, next, walk); |
77 | if (err) |
78 | break; |
79 | } while (pud++, addr = next, addr != end); |
80 | |
81 | return err; |
82 | } |
83 | |
84 | #ifdef CONFIG_HUGETLB_PAGE |
85 | static unsigned long hugetlb_entry_end(struct hstate *h, unsigned long addr, |
86 | unsigned long end) |
87 | { |
88 | unsigned long boundary = (addr & huge_page_mask(h)) + huge_page_size(h); |
89 | return boundary < end ? boundary : end; |
90 | } |
91 | |
92 | static int walk_hugetlb_range(struct vm_area_struct *vma, |
93 | unsigned long addr, unsigned long end, |
94 | struct mm_walk *walk) |
95 | { |
96 | struct hstate *h = hstate_vma(vma); |
97 | unsigned long next; |
98 | unsigned long hmask = huge_page_mask(h); |
99 | pte_t *pte; |
100 | int err = 0; |
101 | |
102 | do { |
103 | next = hugetlb_entry_end(h, addr, end); |
104 | pte = huge_pte_offset(walk->mm, addr & hmask); |
105 | if (pte && walk->hugetlb_entry) |
106 | err = walk->hugetlb_entry(pte, hmask, addr, next, walk); |
107 | if (err) |
108 | return err; |
109 | } while (addr = next, addr != end); |
110 | |
111 | return 0; |
112 | } |
113 | #endif |
114 | |
115 | /** |
116 | * walk_page_range - walk a memory map's page tables with a callback |
117 | * @mm: memory map to walk |
118 | * @addr: starting address |
119 | * @end: ending address |
120 | * @walk: set of callbacks to invoke for each level of the tree |
121 | * |
122 | * Recursively walk the page table for the memory area in a VMA, |
123 | * calling supplied callbacks. Callbacks are called in-order (first |
124 | * PGD, first PUD, first PMD, first PTE, second PTE... second PMD, |
125 | * etc.). If lower-level callbacks are omitted, walking depth is reduced. |
126 | * |
127 | * Each callback receives an entry pointer and the start and end of the |
128 | * associated range, and a copy of the original mm_walk for access to |
129 | * the ->private or ->mm fields. |
130 | * |
131 | * No locks are taken, but the bottom level iterator will map PTE |
132 | * directories from highmem if necessary. |
133 | * |
134 | * If any callback returns a non-zero value, the walk is aborted and |
135 | * the return value is propagated back to the caller. Otherwise 0 is returned. |
136 | */ |
137 | int walk_page_range(unsigned long addr, unsigned long end, |
138 | struct mm_walk *walk) |
139 | { |
140 | pgd_t *pgd; |
141 | unsigned long next; |
142 | int err = 0; |
143 | |
144 | if (addr >= end) |
145 | return err; |
146 | |
147 | if (!walk->mm) |
148 | return -EINVAL; |
149 | |
150 | pgd = pgd_offset(walk->mm, addr); |
151 | do { |
152 | struct vm_area_struct *uninitialized_var(vma); |
153 | |
154 | next = pgd_addr_end(addr, end); |
155 | |
156 | #ifdef CONFIG_HUGETLB_PAGE |
157 | /* |
158 | * handle hugetlb vma individually because pagetable walk for |
159 | * the hugetlb page is dependent on the architecture and |
160 | * we can't handled it in the same manner as non-huge pages. |
161 | */ |
162 | vma = find_vma(walk->mm, addr); |
163 | if (vma && is_vm_hugetlb_page(vma)) { |
164 | if (vma->vm_end < next) |
165 | next = vma->vm_end; |
166 | /* |
167 | * Hugepage is very tightly coupled with vma, so |
168 | * walk through hugetlb entries within a given vma. |
169 | */ |
170 | err = walk_hugetlb_range(vma, addr, next, walk); |
171 | if (err) |
172 | break; |
173 | pgd = pgd_offset(walk->mm, next); |
174 | continue; |
175 | } |
176 | #endif |
177 | if (pgd_none_or_clear_bad(pgd)) { |
178 | if (walk->pte_hole) |
179 | err = walk->pte_hole(addr, next, walk); |
180 | if (err) |
181 | break; |
182 | pgd++; |
183 | continue; |
184 | } |
185 | if (walk->pgd_entry) |
186 | err = walk->pgd_entry(pgd, addr, next, walk); |
187 | if (!err && |
188 | (walk->pud_entry || walk->pmd_entry || walk->pte_entry)) |
189 | err = walk_pud_range(pgd, addr, next, walk); |
190 | if (err) |
191 | break; |
192 | pgd++; |
193 | } while (addr = next, addr != end); |
194 | |
195 | return err; |
196 | } |
197 |
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