projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e6473092 MM |
1 | #include <linux/mm.h> |
| 2 | #include <linux/highmem.h> | |
| 3 | #include <linux/sched.h> | |
| 4 | ||
| 5 | static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, | |
| 6 | const struct mm_walk *walk, void *private) | |
| 7 | { | |
| 8 | pte_t *pte; | |
| 9 | int err = 0; | |
| 10 | ||
| 11 | pte = pte_offset_map(pmd, addr); | |
| 556637cd | 12 | for (;;) { |
| e6473092 MM |
13 | err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, private); |
| 14 | if (err) | |
| 15 | break; | |
| 556637cd JW |
16 | addr += PAGE_SIZE; |
| 17 | if (addr == end) | |
| 18 | break; | |
| 19 | pte++; | |
| 20 | } | |
| e6473092 MM |
21 | |
| 22 | pte_unmap(pte); | |
| 23 | return err; | |
| 24 | } | |
| 25 | ||
| 26 | static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, | |
| 27 | const struct mm_walk *walk, void *private) | |
| 28 | { | |
| 29 | pmd_t *pmd; | |
| 30 | unsigned long next; | |
| 31 | int err = 0; | |
| 32 | ||
| 33 | pmd = pmd_offset(pud, addr); | |
| 34 | do { | |
| 35 | next = pmd_addr_end(addr, end); | |
| 36 | if (pmd_none_or_clear_bad(pmd)) { | |
| 37 | if (walk->pte_hole) | |
| 38 | err = walk->pte_hole(addr, next, private); | |
| 39 | if (err) | |
| 40 | break; | |
| 41 | continue; | |
| 42 | } | |
| 43 | if (walk->pmd_entry) | |
| 44 | err = walk->pmd_entry(pmd, addr, next, private); | |
| 45 | if (!err && walk->pte_entry) | |
| 46 | err = walk_pte_range(pmd, addr, next, walk, private); | |
| 47 | if (err) | |
| 48 | break; | |
| 49 | } while (pmd++, addr = next, addr != end); | |
| 50 | ||
| 51 | return err; | |
| 52 | } | |
| 53 | ||
| 54 | static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end, | |
| 55 | const struct mm_walk *walk, void *private) | |
| 56 | { | |
| 57 | pud_t *pud; | |
| 58 | unsigned long next; | |
| 59 | int err = 0; | |
| 60 | ||
| 61 | pud = pud_offset(pgd, addr); | |
| 62 | do { | |
| 63 | next = pud_addr_end(addr, end); | |
| 64 | if (pud_none_or_clear_bad(pud)) { | |
| 65 | if (walk->pte_hole) | |
| 66 | err = walk->pte_hole(addr, next, private); | |
| 67 | if (err) | |
| 68 | break; | |
| 69 | continue; | |
| 70 | } | |
| 71 | if (walk->pud_entry) | |
| 72 | err = walk->pud_entry(pud, addr, next, private); | |
| 73 | if (!err && (walk->pmd_entry || walk->pte_entry)) | |
| 74 | err = walk_pmd_range(pud, addr, next, walk, private); | |
| 75 | if (err) | |
| 76 | break; | |
| 77 | } while (pud++, addr = next, addr != end); | |
| 78 | ||
| 79 | return err; | |
| 80 | } | |
| 81 | ||
| 82 | /** | |
| 83 | * walk_page_range - walk a memory map's page tables with a callback | |
| 7682486b RD |
84 | * @mm: memory map to walk |
| 85 | * @addr: starting address | |
| 86 | * @end: ending address | |
| 87 | * @walk: set of callbacks to invoke for each level of the tree | |
| 88 | * @private: private data passed to the callback function | |
| e6473092 MM |
89 | * |
| 90 | * Recursively walk the page table for the memory area in a VMA, | |
| 91 | * calling supplied callbacks. Callbacks are called in-order (first | |
| 92 | * PGD, first PUD, first PMD, first PTE, second PTE... second PMD, | |
| 93 | * etc.). If lower-level callbacks are omitted, walking depth is reduced. | |
| 94 | * | |
| 95 | * Each callback receives an entry pointer, the start and end of the | |
| 96 | * associated range, and a caller-supplied private data pointer. | |
| 97 | * | |
| 98 | * No locks are taken, but the bottom level iterator will map PTE | |
| 99 | * directories from highmem if necessary. | |
| 100 | * | |
| 101 | * If any callback returns a non-zero value, the walk is aborted and | |
| 102 | * the return value is propagated back to the caller. Otherwise 0 is returned. | |
| 103 | */ | |
| 104 | int walk_page_range(const struct mm_struct *mm, | |
| 105 | unsigned long addr, unsigned long end, | |
| 106 | const struct mm_walk *walk, void *private) | |
| 107 | { | |
| 108 | pgd_t *pgd; | |
| 109 | unsigned long next; | |
| 110 | int err = 0; | |
| 111 | ||
| 112 | if (addr >= end) | |
| 113 | return err; | |
| 114 | ||
| 115 | pgd = pgd_offset(mm, addr); | |
| 116 | do { | |
| 117 | next = pgd_addr_end(addr, end); | |
| 118 | if (pgd_none_or_clear_bad(pgd)) { | |
| 119 | if (walk->pte_hole) | |
| 120 | err = walk->pte_hole(addr, next, private); | |
| 121 | if (err) | |
| 122 | break; | |
| 123 | continue; | |
| 124 | } | |
| 125 | if (walk->pgd_entry) | |
| 126 | err = walk->pgd_entry(pgd, addr, next, private); | |
| 127 | if (!err && | |
| 128 | (walk->pud_entry || walk->pmd_entry || walk->pte_entry)) | |
| 129 | err = walk_pud_range(pgd, addr, next, walk, private); | |
| 130 | if (err) | |
| 131 | break; | |
| 132 | } while (pgd++, addr = next, addr != end); | |
| 133 | ||
| 134 | return err; | |
| 135 | } |