#include <linux/mm.h> #include <linux/highmem.h> #include <linux/sched.h> #include <linux/hugetlb.h> static int walk_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) { pte_t *pte; int err = 0; pte = pte_offset_map(pmd, addr); for (;;) { err = walk->pte_entry(pte, addr, addr + PAGE_SIZE, walk); if (err) break; addr += PAGE_SIZE; if (addr == end) break; pte++; } pte_unmap(pte); return err; } static int walk_pmd_range(pud_t *pud, unsigned long addr, unsigned long end, struct mm_walk *walk) { pmd_t *pmd; unsigned long next; int err = 0; pmd = pmd_offset(pud, addr); do { next = pmd_addr_end(addr, end); if (pmd_none_or_clear_bad(pmd)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); if (err) break; continue; } if (walk->pmd_entry) err = walk->pmd_entry(pmd, addr, next, walk); if (!err && walk->pte_entry) err = walk_pte_range(pmd, addr, next, walk); if (err) break; } while (pmd++, addr = next, addr != end); return err; } static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end, struct mm_walk *walk) { pud_t *pud; unsigned long next; int err = 0; pud = pud_offset(pgd, addr); do { next = pud_addr_end(addr, end); if (pud_none_or_clear_bad(pud)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); if (err) break; continue; } if (walk->pud_entry) err = walk->pud_entry(pud, addr, next, walk); if (!err && (walk->pmd_entry || walk->pte_entry)) err = walk_pmd_range(pud, addr, next, walk); if (err) break; } while (pud++, addr = next, addr != end); return err; } /** * walk_page_range - walk a memory map's page tables with a callback * @mm: memory map to walk * @addr: starting address * @end: ending address * @walk: set of callbacks to invoke for each level of the tree * * Recursively walk the page table for the memory area in a VMA, * calling supplied callbacks. Callbacks are called in-order (first * PGD, first PUD, first PMD, first PTE, second PTE... second PMD, * etc.). If lower-level callbacks are omitted, walking depth is reduced. * * Each callback receives an entry pointer and the start and end of the * associated range, and a copy of the original mm_walk for access to * the ->private or ->mm fields. * * No locks are taken, but the bottom level iterator will map PTE * directories from highmem if necessary. * * If any callback returns a non-zero value, the walk is aborted and * the return value is propagated back to the caller. Otherwise 0 is returned. */ int walk_page_range(unsigned long addr, unsigned long end, struct mm_walk *walk) { pgd_t *pgd; unsigned long next; int err = 0; struct vm_area_struct *vma; if (addr >= end) return err; if (!walk->mm) return -EINVAL; pgd = pgd_offset(walk->mm, addr); do { next = pgd_addr_end(addr, end); /* * handle hugetlb vma individually because pagetable walk for * the hugetlb page is dependent on the architecture and * we can't handled it in the same manner as non-huge pages. */ vma = find_vma(walk->mm, addr); #ifdef CONFIG_HUGETLB_PAGE if (vma && is_vm_hugetlb_page(vma)) { pte_t *pte; struct hstate *hs; if (vma->vm_end < next) next = vma->vm_end; hs = hstate_vma(vma); pte = huge_pte_offset(walk->mm, addr & huge_page_mask(hs)); if (pte && !huge_pte_none(huge_ptep_get(pte)) && walk->hugetlb_entry) err = walk->hugetlb_entry(pte, addr, next, walk); if (err) break; continue; } #endif if (pgd_none_or_clear_bad(pgd)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); if (err) break; pgd++; continue; } if (walk->pgd_entry) err = walk->pgd_entry(pgd, addr, next, walk); if (!err && (walk->pud_entry || walk->pmd_entry || walk->pte_entry)) err = walk_pud_range(pgd, addr, next, walk); if (err) break; pgd++; } while (addr = next, addr != end); return err; }