1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_PAGEWALK_H 3 #define _LINUX_PAGEWALK_H 4 5 #include <linux/mm.h> 6 7 struct mm_walk; 8 9 /** 10 * mm_walk_ops - callbacks for walk_page_range 11 * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry 12 * this handler should only handle pud_trans_huge() puds. 13 * the pmd_entry or pte_entry callbacks will be used for 14 * regular PUDs. 15 * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry 16 * this handler is required to be able to handle 17 * pmd_trans_huge() pmds. They may simply choose to 18 * split_huge_page() instead of handling it explicitly. 19 * @pte_entry: if set, called for each non-empty PTE (4th-level) entry 20 * @pte_hole: if set, called for each hole at all levels 21 * @hugetlb_entry: if set, called for each hugetlb entry 22 * @test_walk: caller specific callback function to determine whether 23 * we walk over the current vma or not. Returning 0 means 24 * "do page table walk over the current vma", returning 25 * a negative value means "abort current page table walk 26 * right now" and returning 1 means "skip the current vma" 27 */ 28 struct mm_walk_ops { 29 int (*pud_entry)(pud_t *pud, unsigned long addr, 30 unsigned long next, struct mm_walk *walk); 31 int (*pmd_entry)(pmd_t *pmd, unsigned long addr, 32 unsigned long next, struct mm_walk *walk); 33 int (*pte_entry)(pte_t *pte, unsigned long addr, 34 unsigned long next, struct mm_walk *walk); 35 int (*pte_hole)(unsigned long addr, unsigned long next, 36 struct mm_walk *walk); 37 int (*hugetlb_entry)(pte_t *pte, unsigned long hmask, 38 unsigned long addr, unsigned long next, 39 struct mm_walk *walk); 40 int (*test_walk)(unsigned long addr, unsigned long next, 41 struct mm_walk *walk); 42 }; 43 44 /** 45 * mm_walk - walk_page_range data 46 * @ops: operation to call during the walk 47 * @mm: mm_struct representing the target process of page table walk 48 * @vma: vma currently walked (NULL if walking outside vmas) 49 * @private: private data for callbacks' usage 50 * 51 * (see the comment on walk_page_range() for more details) 52 */ 53 struct mm_walk { 54 const struct mm_walk_ops *ops; 55 struct mm_struct *mm; 56 struct vm_area_struct *vma; 57 void *private; 58 }; 59 60 int walk_page_range(struct mm_struct *mm, unsigned long start, 61 unsigned long end, const struct mm_walk_ops *ops, 62 void *private); 63 int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, 64 void *private); 65 66 #endif /* _LINUX_PAGEWALK_H */ 67