1 #include <linux/mm.h>
2 #include <linux/highmem.h>
3 #include <linux/sched.h>
4 #include <linux/hugetlb.h>
5
walk_pte_range(pmd_t * pmd,unsigned long addr,unsigned long end,struct mm_walk * walk)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
walk_pmd_range(pud_t * pud,unsigned long addr,unsigned long end,struct mm_walk * walk)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 again:
37 next = pmd_addr_end(addr, end);
38 if (pmd_none(*pmd)) {
39 if (walk->pte_hole)
40 err = walk->pte_hole(addr, next, walk);
41 if (err)
42 break;
43 continue;
44 }
45 /*
46 * This implies that each ->pmd_entry() handler
47 * needs to know about pmd_trans_huge() pmds
48 */
49 if (walk->pmd_entry)
50 err = walk->pmd_entry(pmd, addr, next, walk);
51 if (err)
52 break;
53
54 /*
55 * Check this here so we only break down trans_huge
56 * pages when we _need_ to
57 */
58 if (!walk->pte_entry)
59 continue;
60
61 split_huge_page_pmd_mm(walk->mm, addr, pmd);
62 if (pmd_none_or_trans_huge_or_clear_bad(pmd))
63 goto again;
64 err = walk_pte_range(pmd, addr, next, walk);
65 if (err)
66 break;
67 } while (pmd++, addr = next, addr != end);
68
69 return err;
70 }
71
walk_pud_range(pgd_t * pgd,unsigned long addr,unsigned long end,struct mm_walk * walk)72 static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
73 struct mm_walk *walk)
74 {
75 pud_t *pud;
76 unsigned long next;
77 int err = 0;
78
79 pud = pud_offset(pgd, addr);
80 do {
81 next = pud_addr_end(addr, end);
82 if (pud_none_or_clear_bad(pud)) {
83 if (walk->pte_hole)
84 err = walk->pte_hole(addr, next, walk);
85 if (err)
86 break;
87 continue;
88 }
89 if (walk->pud_entry)
90 err = walk->pud_entry(pud, addr, next, walk);
91 if (!err && (walk->pmd_entry || walk->pte_entry))
92 err = walk_pmd_range(pud, addr, next, walk);
93 if (err)
94 break;
95 } while (pud++, addr = next, addr != end);
96
97 return err;
98 }
99
100 #ifdef CONFIG_HUGETLB_PAGE
hugetlb_entry_end(struct hstate * h,unsigned long addr,unsigned long end)101 static unsigned long hugetlb_entry_end(struct hstate *h, unsigned long addr,
102 unsigned long end)
103 {
104 unsigned long boundary = (addr & huge_page_mask(h)) + huge_page_size(h);
105 return boundary < end ? boundary : end;
106 }
107
walk_hugetlb_range(struct vm_area_struct * vma,unsigned long addr,unsigned long end,struct mm_walk * walk)108 static int walk_hugetlb_range(struct vm_area_struct *vma,
109 unsigned long addr, unsigned long end,
110 struct mm_walk *walk)
111 {
112 struct hstate *h = hstate_vma(vma);
113 unsigned long next;
114 unsigned long hmask = huge_page_mask(h);
115 pte_t *pte;
116 int err = 0;
117
118 do {
119 next = hugetlb_entry_end(h, addr, end);
120 pte = huge_pte_offset(walk->mm, addr & hmask);
121 if (pte && walk->hugetlb_entry)
122 err = walk->hugetlb_entry(pte, hmask, addr, next, walk);
123 if (err)
124 return err;
125 } while (addr = next, addr != end);
126
127 return 0;
128 }
129
130 #else /* CONFIG_HUGETLB_PAGE */
walk_hugetlb_range(struct vm_area_struct * vma,unsigned long addr,unsigned long end,struct mm_walk * walk)131 static int walk_hugetlb_range(struct vm_area_struct *vma,
132 unsigned long addr, unsigned long end,
133 struct mm_walk *walk)
134 {
135 return 0;
136 }
137
138 #endif /* CONFIG_HUGETLB_PAGE */
139
140
141
142 /**
143 * walk_page_range - walk a memory map's page tables with a callback
144 * @addr: starting address
145 * @end: ending address
146 * @walk: set of callbacks to invoke for each level of the tree
147 *
148 * Recursively walk the page table for the memory area in a VMA,
149 * calling supplied callbacks. Callbacks are called in-order (first
150 * PGD, first PUD, first PMD, first PTE, second PTE... second PMD,
151 * etc.). If lower-level callbacks are omitted, walking depth is reduced.
152 *
153 * Each callback receives an entry pointer and the start and end of the
154 * associated range, and a copy of the original mm_walk for access to
155 * the ->private or ->mm fields.
156 *
157 * Usually no locks are taken, but splitting transparent huge page may
158 * take page table lock. And the bottom level iterator will map PTE
159 * directories from highmem if necessary.
160 *
161 * If any callback returns a non-zero value, the walk is aborted and
162 * the return value is propagated back to the caller. Otherwise 0 is returned.
163 *
164 * walk->mm->mmap_sem must be held for at least read if walk->hugetlb_entry
165 * is !NULL.
166 */
walk_page_range(unsigned long addr,unsigned long end,struct mm_walk * walk)167 int walk_page_range(unsigned long addr, unsigned long end,
168 struct mm_walk *walk)
169 {
170 pgd_t *pgd;
171 unsigned long next;
172 int err = 0;
173
174 if (addr >= end)
175 return err;
176
177 if (!walk->mm)
178 return -EINVAL;
179
180 VM_BUG_ON_MM(!rwsem_is_locked(&walk->mm->mmap_sem), walk->mm);
181
182 pgd = pgd_offset(walk->mm, addr);
183 do {
184 struct vm_area_struct *vma = NULL;
185
186 next = pgd_addr_end(addr, end);
187
188 /*
189 * This function was not intended to be vma based.
190 * But there are vma special cases to be handled:
191 * - hugetlb vma's
192 * - VM_PFNMAP vma's
193 */
194 vma = find_vma(walk->mm, addr);
195 if (vma) {
196 /*
197 * There are no page structures backing a VM_PFNMAP
198 * range, so do not allow split_huge_page_pmd().
199 */
200 if ((vma->vm_start <= addr) &&
201 (vma->vm_flags & VM_PFNMAP)) {
202 if (walk->pte_hole)
203 err = walk->pte_hole(addr, next, walk);
204 if (err)
205 break;
206 pgd = pgd_offset(walk->mm, next);
207 continue;
208 }
209 /*
210 * Handle hugetlb vma individually because pagetable
211 * walk for the hugetlb page is dependent on the
212 * architecture and we can't handled it in the same
213 * manner as non-huge pages.
214 */
215 if (walk->hugetlb_entry && (vma->vm_start <= addr) &&
216 is_vm_hugetlb_page(vma)) {
217 if (vma->vm_end < next)
218 next = vma->vm_end;
219 /*
220 * Hugepage is very tightly coupled with vma,
221 * so walk through hugetlb entries within a
222 * given vma.
223 */
224 err = walk_hugetlb_range(vma, addr, next, walk);
225 if (err)
226 break;
227 pgd = pgd_offset(walk->mm, next);
228 continue;
229 }
230 }
231
232 if (pgd_none_or_clear_bad(pgd)) {
233 if (walk->pte_hole)
234 err = walk->pte_hole(addr, next, walk);
235 if (err)
236 break;
237 pgd++;
238 continue;
239 }
240 if (walk->pgd_entry)
241 err = walk->pgd_entry(pgd, addr, next, walk);
242 if (!err &&
243 (walk->pud_entry || walk->pmd_entry || walk->pte_entry))
244 err = walk_pud_range(pgd, addr, next, walk);
245 if (err)
246 break;
247 pgd++;
248 } while (addr = next, addr < end);
249
250 return err;
251 }
252