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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 | // SPDX-License-Identifier: GPL-2.0 /* * IBM System z Huge TLB Page Support for Kernel. * * Copyright IBM Corp. 2007,2016 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com> */ #define KMSG_COMPONENT "hugetlb" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include <linux/mm.h> #include <linux/hugetlb.h> /* * If the bit selected by single-bit bitmask "a" is set within "x", move * it to the position indicated by single-bit bitmask "b". */ #define move_set_bit(x, a, b) (((x) & (a)) >> ilog2(a) << ilog2(b)) static inline unsigned long __pte_to_rste(pte_t pte) { unsigned long rste; /* * Convert encoding pte bits pmd / pud bits * lIR.uswrdy.p dy..R...I...wr * empty 010.000000.0 -> 00..0...1...00 * prot-none, clean, old 111.000000.1 -> 00..1...1...00 * prot-none, clean, young 111.000001.1 -> 01..1...1...00 * prot-none, dirty, old 111.000010.1 -> 10..1...1...00 * prot-none, dirty, young 111.000011.1 -> 11..1...1...00 * read-only, clean, old 111.000100.1 -> 00..1...1...01 * read-only, clean, young 101.000101.1 -> 01..1...0...01 * read-only, dirty, old 111.000110.1 -> 10..1...1...01 * read-only, dirty, young 101.000111.1 -> 11..1...0...01 * read-write, clean, old 111.001100.1 -> 00..1...1...11 * read-write, clean, young 101.001101.1 -> 01..1...0...11 * read-write, dirty, old 110.001110.1 -> 10..0...1...11 * read-write, dirty, young 100.001111.1 -> 11..0...0...11 * HW-bits: R read-only, I invalid * SW-bits: p present, y young, d dirty, r read, w write, s special, * u unused, l large */ if (pte_present(pte)) { rste = pte_val(pte) & PAGE_MASK; rste |= move_set_bit(pte_val(pte), _PAGE_READ, _SEGMENT_ENTRY_READ); rste |= move_set_bit(pte_val(pte), _PAGE_WRITE, _SEGMENT_ENTRY_WRITE); rste |= move_set_bit(pte_val(pte), _PAGE_INVALID, _SEGMENT_ENTRY_INVALID); rste |= move_set_bit(pte_val(pte), _PAGE_PROTECT, _SEGMENT_ENTRY_PROTECT); rste |= move_set_bit(pte_val(pte), _PAGE_DIRTY, _SEGMENT_ENTRY_DIRTY); rste |= move_set_bit(pte_val(pte), _PAGE_YOUNG, _SEGMENT_ENTRY_YOUNG); #ifdef CONFIG_MEM_SOFT_DIRTY rste |= move_set_bit(pte_val(pte), _PAGE_SOFT_DIRTY, _SEGMENT_ENTRY_SOFT_DIRTY); #endif rste |= move_set_bit(pte_val(pte), _PAGE_NOEXEC, _SEGMENT_ENTRY_NOEXEC); } else rste = _SEGMENT_ENTRY_EMPTY; return rste; } static inline pte_t __rste_to_pte(unsigned long rste) { int present; pte_t pte; if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) present = pud_present(__pud(rste)); else present = pmd_present(__pmd(rste)); /* * Convert encoding pmd / pud bits pte bits * dy..R...I...wr lIR.uswrdy.p * empty 00..0...1...00 -> 010.000000.0 * prot-none, clean, old 00..1...1...00 -> 111.000000.1 * prot-none, clean, young 01..1...1...00 -> 111.000001.1 * prot-none, dirty, old 10..1...1...00 -> 111.000010.1 * prot-none, dirty, young 11..1...1...00 -> 111.000011.1 * read-only, clean, old 00..1...1...01 -> 111.000100.1 * read-only, clean, young 01..1...0...01 -> 101.000101.1 * read-only, dirty, old 10..1...1...01 -> 111.000110.1 * read-only, dirty, young 11..1...0...01 -> 101.000111.1 * read-write, clean, old 00..1...1...11 -> 111.001100.1 * read-write, clean, young 01..1...0...11 -> 101.001101.1 * read-write, dirty, old 10..0...1...11 -> 110.001110.1 * read-write, dirty, young 11..0...0...11 -> 100.001111.1 * HW-bits: R read-only, I invalid * SW-bits: p present, y young, d dirty, r read, w write, s special, * u unused, l large */ if (present) { pte_val(pte) = rste & _SEGMENT_ENTRY_ORIGIN_LARGE; pte_val(pte) |= _PAGE_LARGE | _PAGE_PRESENT; pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_READ, _PAGE_READ); pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_WRITE, _PAGE_WRITE); pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_INVALID, _PAGE_INVALID); pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_PROTECT, _PAGE_PROTECT); pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_DIRTY, _PAGE_DIRTY); pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_YOUNG, _PAGE_YOUNG); #ifdef CONFIG_MEM_SOFT_DIRTY pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_SOFT_DIRTY, _PAGE_DIRTY); #endif pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_NOEXEC, _PAGE_NOEXEC); } else pte_val(pte) = _PAGE_INVALID; return pte; } void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) { unsigned long rste; rste = __pte_to_rste(pte); if (!MACHINE_HAS_NX) rste &= ~_SEGMENT_ENTRY_NOEXEC; /* Set correct table type for 2G hugepages */ if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) rste |= _REGION_ENTRY_TYPE_R3 | _REGION3_ENTRY_LARGE; else rste |= _SEGMENT_ENTRY_LARGE; pte_val(*ptep) = rste; } pte_t huge_ptep_get(pte_t *ptep) { return __rste_to_pte(pte_val(*ptep)); } pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { pte_t pte = huge_ptep_get(ptep); pmd_t *pmdp = (pmd_t *) ptep; pud_t *pudp = (pud_t *) ptep; if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) pudp_xchg_direct(mm, addr, pudp, __pud(_REGION3_ENTRY_EMPTY)); else pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY)); return pte; } pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) { pgd_t *pgdp; p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp = NULL; pgdp = pgd_offset(mm, addr); p4dp = p4d_alloc(mm, pgdp, addr); if (p4dp) { pudp = pud_alloc(mm, p4dp, addr); if (pudp) { if (sz == PUD_SIZE) return (pte_t *) pudp; else if (sz == PMD_SIZE) pmdp = pmd_alloc(mm, pudp, addr); } } return (pte_t *) pmdp; } pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, unsigned long sz) { pgd_t *pgdp; p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp = NULL; pgdp = pgd_offset(mm, addr); if (pgd_present(*pgdp)) { p4dp = p4d_offset(pgdp, addr); if (p4d_present(*p4dp)) { pudp = pud_offset(p4dp, addr); if (pud_present(*pudp)) { if (pud_large(*pudp)) return (pte_t *) pudp; pmdp = pmd_offset(pudp, addr); } } } return (pte_t *) pmdp; } int pmd_huge(pmd_t pmd) { return pmd_large(pmd); } int pud_huge(pud_t pud) { return pud_large(pud); } struct page * follow_huge_pud(struct mm_struct *mm, unsigned long address, pud_t *pud, int flags) { if (flags & FOLL_GET) return NULL; return pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); } static __init int setup_hugepagesz(char *opt) { unsigned long size; char *string = opt; size = memparse(opt, &opt); if (MACHINE_HAS_EDAT1 && size == PMD_SIZE) { hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); } else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE) { hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); } else { hugetlb_bad_size(); pr_err("hugepagesz= specifies an unsupported page size %s\n", string); return 0; } return 1; } __setup("hugepagesz=", setup_hugepagesz); |