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e6473092 MM |
1 | #include <linux/mm.h> |
2 | #include <linux/highmem.h> | |
3 | #include <linux/sched.h> | |
d33b9f45 | 4 | #include <linux/hugetlb.h> |
e6473092 MM |
5 | |
6 | static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, | |
2165009b | 7 | struct mm_walk *walk) |
e6473092 MM |
8 | { |
9 | pte_t *pte; | |
10 | int err = 0; | |
11 | ||
12 | pte = pte_offset_map(pmd, addr); | |
556637cd | 13 | for (;;) { |
2165009b | 14 | err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk); |
e6473092 MM |
15 | if (err) |
16 | break; | |
556637cd JW |
17 | addr += PAGE_SIZE; |
18 | if (addr == end) | |
19 | break; | |
20 | pte++; | |
21 | } | |
e6473092 MM |
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, | |
2165009b | 28 | struct mm_walk *walk) |
e6473092 MM |
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); | |
bae9c19b | 37 | split_huge_page_pmd(walk->mm, pmd); |
e6473092 MM |
38 | if (pmd_none_or_clear_bad(pmd)) { |
39 | if (walk->pte_hole) | |
2165009b | 40 | err = walk->pte_hole(addr, next, walk); |
e6473092 MM |
41 | if (err) |
42 | break; | |
43 | continue; | |
44 | } | |
45 | if (walk->pmd_entry) | |
2165009b | 46 | err = walk->pmd_entry(pmd, addr, next, walk); |
e6473092 | 47 | if (!err && walk->pte_entry) |
2165009b | 48 | err = walk_pte_range(pmd, addr, next, walk); |
e6473092 MM |
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, | |
2165009b | 57 | struct mm_walk *walk) |
e6473092 MM |
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) | |
2165009b | 68 | err = walk->pte_hole(addr, next, walk); |
e6473092 MM |
69 | if (err) |
70 | break; | |
71 | continue; | |
72 | } | |
73 | if (walk->pud_entry) | |
2165009b | 74 | err = walk->pud_entry(pud, addr, next, walk); |
e6473092 | 75 | if (!err && (walk->pmd_entry || walk->pte_entry)) |
2165009b | 76 | err = walk_pmd_range(pud, addr, next, walk); |
e6473092 MM |
77 | if (err) |
78 | break; | |
79 | } while (pud++, addr = next, addr != end); | |
80 | ||
81 | return err; | |
82 | } | |
83 | ||
116354d1 NH |
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 | ||
e6473092 MM |
115 | /** |
116 | * walk_page_range - walk a memory map's page tables with a callback | |
7682486b RD |
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 | |
e6473092 MM |
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 | * | |
2165009b DH |
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. | |
e6473092 MM |
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 | */ | |
2165009b DH |
137 | int walk_page_range(unsigned long addr, unsigned long end, |
138 | struct mm_walk *walk) | |
e6473092 MM |
139 | { |
140 | pgd_t *pgd; | |
141 | unsigned long next; | |
142 | int err = 0; | |
143 | ||
144 | if (addr >= end) | |
145 | return err; | |
146 | ||
2165009b DH |
147 | if (!walk->mm) |
148 | return -EINVAL; | |
149 | ||
150 | pgd = pgd_offset(walk->mm, addr); | |
e6473092 | 151 | do { |
5f0af70a DS |
152 | struct vm_area_struct *uninitialized_var(vma); |
153 | ||
e6473092 | 154 | next = pgd_addr_end(addr, end); |
d33b9f45 | 155 | |
5f0af70a | 156 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 NH |
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 | */ | |
d33b9f45 NH |
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; | |
116354d1 NH |
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); | |
5dc37642 NH |
171 | if (err) |
172 | break; | |
116354d1 | 173 | pgd = pgd_offset(walk->mm, next); |
d33b9f45 NH |
174 | continue; |
175 | } | |
5dc37642 | 176 | #endif |
e6473092 MM |
177 | if (pgd_none_or_clear_bad(pgd)) { |
178 | if (walk->pte_hole) | |
2165009b | 179 | err = walk->pte_hole(addr, next, walk); |
e6473092 MM |
180 | if (err) |
181 | break; | |
d33b9f45 | 182 | pgd++; |
e6473092 MM |
183 | continue; |
184 | } | |
185 | if (walk->pgd_entry) | |
2165009b | 186 | err = walk->pgd_entry(pgd, addr, next, walk); |
e6473092 MM |
187 | if (!err && |
188 | (walk->pud_entry || walk->pmd_entry || walk->pte_entry)) | |
2165009b | 189 | err = walk_pud_range(pgd, addr, next, walk); |
e6473092 MM |
190 | if (err) |
191 | break; | |
d33b9f45 NH |
192 | pgd++; |
193 | } while (addr = next, addr != end); | |
e6473092 MM |
194 | |
195 | return err; | |
196 | } |