1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <asm/pgalloc.h> 4 #include <linux/gfp.h> 5 #include <linux/kernel.h> 6 #include <linux/pgtable.h> 7 8 int ptep_set_access_flags(struct vm_area_struct *vma, 9 unsigned long address, pte_t *ptep, 10 pte_t entry, int dirty) 11 { 12 if (!pte_same(ptep_get(ptep), entry)) 13 __set_pte_at(vma->vm_mm, ptep, entry); 14 /* 15 * update_mmu_cache will unconditionally execute, handling both 16 * the case that the PTE changed and the spurious fault case. 17 */ 18 return true; 19 } 20 21 int ptep_test_and_clear_young(struct vm_area_struct *vma, 22 unsigned long address, 23 pte_t *ptep) 24 { 25 if (!pte_young(ptep_get(ptep))) 26 return 0; 27 return test_and_clear_bit(_PAGE_ACCESSED_OFFSET, &pte_val(*ptep)); 28 } 29 EXPORT_SYMBOL_GPL(ptep_test_and_clear_young); 30 31 #ifdef CONFIG_64BIT 32 pud_t *pud_offset(p4d_t *p4d, unsigned long address) 33 { 34 if (pgtable_l4_enabled) 35 return p4d_pgtable(p4dp_get(p4d)) + pud_index(address); 36 37 return (pud_t *)p4d; 38 } 39 40 p4d_t *p4d_offset(pgd_t *pgd, unsigned long address) 41 { 42 if (pgtable_l5_enabled) 43 return pgd_pgtable(pgdp_get(pgd)) + p4d_index(address); 44 45 return (p4d_t *)pgd; 46 } 47 #endif 48 49 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP 50 int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot) 51 { 52 return 0; 53 } 54 55 void p4d_clear_huge(p4d_t *p4d) 56 { 57 } 58 59 int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot) 60 { 61 pud_t new_pud = pfn_pud(__phys_to_pfn(phys), prot); 62 63 set_pud(pud, new_pud); 64 return 1; 65 } 66 67 int pud_clear_huge(pud_t *pud) 68 { 69 if (!pud_leaf(pudp_get(pud))) 70 return 0; 71 pud_clear(pud); 72 return 1; 73 } 74 75 int pud_free_pmd_page(pud_t *pud, unsigned long addr) 76 { 77 pmd_t *pmd = pud_pgtable(pudp_get(pud)); 78 int i; 79 80 pud_clear(pud); 81 82 flush_tlb_kernel_range(addr, addr + PUD_SIZE); 83 84 for (i = 0; i < PTRS_PER_PMD; i++) { 85 if (!pmd_none(pmd[i])) { 86 pte_t *pte = (pte_t *)pmd_page_vaddr(pmd[i]); 87 88 pte_free_kernel(NULL, pte); 89 } 90 } 91 92 pmd_free(NULL, pmd); 93 94 return 1; 95 } 96 97 int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot) 98 { 99 pmd_t new_pmd = pfn_pmd(__phys_to_pfn(phys), prot); 100 101 set_pmd(pmd, new_pmd); 102 return 1; 103 } 104 105 int pmd_clear_huge(pmd_t *pmd) 106 { 107 if (!pmd_leaf(pmdp_get(pmd))) 108 return 0; 109 pmd_clear(pmd); 110 return 1; 111 } 112 113 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr) 114 { 115 pte_t *pte = (pte_t *)pmd_page_vaddr(pmdp_get(pmd)); 116 117 pmd_clear(pmd); 118 119 flush_tlb_kernel_range(addr, addr + PMD_SIZE); 120 pte_free_kernel(NULL, pte); 121 return 1; 122 } 123 124 #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ 125 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 126 pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, 127 unsigned long address, pmd_t *pmdp) 128 { 129 pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp); 130 131 VM_BUG_ON(address & ~HPAGE_PMD_MASK); 132 VM_BUG_ON(pmd_trans_huge(pmdp_get(pmdp))); 133 /* 134 * When leaf PTE entries (regular pages) are collapsed into a leaf 135 * PMD entry (huge page), a valid non-leaf PTE is converted into a 136 * valid leaf PTE at the level 1 page table. Since the sfence.vma 137 * forms that specify an address only apply to leaf PTEs, we need a 138 * global flush here. collapse_huge_page() assumes these flushes are 139 * eager, so just do the fence here. 140 */ 141 flush_tlb_mm(vma->vm_mm); 142 return pmd; 143 } 144 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 145