1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com> 4 * Copyright (C) 2012 Regents of the University of California 5 */ 6 7 #ifndef _ASM_RISCV_PGALLOC_H 8 #define _ASM_RISCV_PGALLOC_H 9 10 #include <linux/mm.h> 11 #include <asm/tlb.h> 12 13 #ifdef CONFIG_MMU 14 #define __HAVE_ARCH_PUD_ALLOC_ONE 15 #define __HAVE_ARCH_PUD_FREE 16 #include <asm-generic/pgalloc.h> 17 18 static inline void pmd_populate_kernel(struct mm_struct *mm, 19 pmd_t *pmd, pte_t *pte) 20 { 21 unsigned long pfn = virt_to_pfn(pte); 22 23 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 24 } 25 26 static inline void pmd_populate(struct mm_struct *mm, 27 pmd_t *pmd, pgtable_t pte) 28 { 29 unsigned long pfn = virt_to_pfn(page_address(pte)); 30 31 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 32 } 33 34 #ifndef __PAGETABLE_PMD_FOLDED 35 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 36 { 37 unsigned long pfn = virt_to_pfn(pmd); 38 39 set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 40 } 41 42 static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) 43 { 44 if (pgtable_l4_enabled) { 45 unsigned long pfn = virt_to_pfn(pud); 46 47 set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 48 } 49 } 50 51 static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, 52 pud_t *pud) 53 { 54 if (pgtable_l4_enabled) { 55 unsigned long pfn = virt_to_pfn(pud); 56 57 set_p4d_safe(p4d, 58 __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 59 } 60 } 61 62 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) 63 { 64 if (pgtable_l5_enabled) { 65 unsigned long pfn = virt_to_pfn(p4d); 66 67 set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 68 } 69 } 70 71 static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, 72 p4d_t *p4d) 73 { 74 if (pgtable_l5_enabled) { 75 unsigned long pfn = virt_to_pfn(p4d); 76 77 set_pgd_safe(pgd, 78 __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE)); 79 } 80 } 81 82 #define pud_alloc_one pud_alloc_one 83 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 84 { 85 if (pgtable_l4_enabled) 86 return __pud_alloc_one(mm, addr); 87 88 return NULL; 89 } 90 91 #define pud_free pud_free 92 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 93 { 94 if (pgtable_l4_enabled) 95 __pud_free(mm, pud); 96 } 97 98 #define __pud_free_tlb(tlb, pud, addr) pud_free((tlb)->mm, pud) 99 100 #define p4d_alloc_one p4d_alloc_one 101 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr) 102 { 103 if (pgtable_l5_enabled) { 104 gfp_t gfp = GFP_PGTABLE_USER; 105 106 if (mm == &init_mm) 107 gfp = GFP_PGTABLE_KERNEL; 108 return (p4d_t *)get_zeroed_page(gfp); 109 } 110 111 return NULL; 112 } 113 114 static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d) 115 { 116 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1)); 117 free_page((unsigned long)p4d); 118 } 119 120 #define p4d_free p4d_free 121 static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) 122 { 123 if (pgtable_l5_enabled) 124 __p4d_free(mm, p4d); 125 } 126 127 #define __p4d_free_tlb(tlb, p4d, addr) p4d_free((tlb)->mm, p4d) 128 #endif /* __PAGETABLE_PMD_FOLDED */ 129 130 static inline void sync_kernel_mappings(pgd_t *pgd) 131 { 132 memcpy(pgd + USER_PTRS_PER_PGD, 133 init_mm.pgd + USER_PTRS_PER_PGD, 134 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); 135 } 136 137 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 138 { 139 pgd_t *pgd; 140 141 pgd = (pgd_t *)__get_free_page(GFP_KERNEL); 142 if (likely(pgd != NULL)) { 143 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); 144 /* Copy kernel mappings */ 145 sync_kernel_mappings(pgd); 146 } 147 return pgd; 148 } 149 150 #ifndef __PAGETABLE_PMD_FOLDED 151 152 #define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd) 153 154 #endif /* __PAGETABLE_PMD_FOLDED */ 155 156 #define __pte_free_tlb(tlb, pte, buf) \ 157 do { \ 158 pagetable_pte_dtor(page_ptdesc(pte)); \ 159 tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));\ 160 } while (0) 161 #endif /* CONFIG_MMU */ 162 163 #endif /* _ASM_RISCV_PGALLOC_H */ 164