| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <linux/hugetlb.h> |
| 3 | #include <linux/err.h> |
| 4 | |
| 5 | #ifdef CONFIG_RISCV_ISA_SVNAPOT |
| 6 | pte_t huge_ptep_get(pte_t *ptep) |
| 7 | { |
| 8 | unsigned long pte_num; |
| 9 | int i; |
| 10 | pte_t orig_pte = ptep_get(ptep); |
| 11 | |
| 12 | if (!pte_present(orig_pte) || !pte_napot(orig_pte)) |
| 13 | return orig_pte; |
| 14 | |
| 15 | pte_num = napot_pte_num(napot_cont_order(orig_pte)); |
| 16 | |
| 17 | for (i = 0; i < pte_num; i++, ptep++) { |
| 18 | pte_t pte = ptep_get(ptep); |
| 19 | |
| 20 | if (pte_dirty(pte)) |
| 21 | orig_pte = pte_mkdirty(orig_pte); |
| 22 | |
| 23 | if (pte_young(pte)) |
| 24 | orig_pte = pte_mkyoung(orig_pte); |
| 25 | } |
| 26 | |
| 27 | return orig_pte; |
| 28 | } |
| 29 | |
| 30 | pte_t *huge_pte_alloc(struct mm_struct *mm, |
| 31 | struct vm_area_struct *vma, |
| 32 | unsigned long addr, |
| 33 | unsigned long sz) |
| 34 | { |
| 35 | unsigned long order; |
| 36 | pte_t *pte = NULL; |
| 37 | pgd_t *pgd; |
| 38 | p4d_t *p4d; |
| 39 | pud_t *pud; |
| 40 | pmd_t *pmd; |
| 41 | |
| 42 | pgd = pgd_offset(mm, addr); |
| 43 | p4d = p4d_alloc(mm, pgd, addr); |
| 44 | if (!p4d) |
| 45 | return NULL; |
| 46 | |
| 47 | pud = pud_alloc(mm, p4d, addr); |
| 48 | if (!pud) |
| 49 | return NULL; |
| 50 | |
| 51 | if (sz == PUD_SIZE) { |
| 52 | pte = (pte_t *)pud; |
| 53 | goto out; |
| 54 | } |
| 55 | |
| 56 | if (sz == PMD_SIZE) { |
| 57 | if (want_pmd_share(vma, addr) && pud_none(pudp_get(pud))) |
| 58 | pte = huge_pmd_share(mm, vma, addr, pud); |
| 59 | else |
| 60 | pte = (pte_t *)pmd_alloc(mm, pud, addr); |
| 61 | goto out; |
| 62 | } |
| 63 | |
| 64 | pmd = pmd_alloc(mm, pud, addr); |
| 65 | if (!pmd) |
| 66 | return NULL; |
| 67 | |
| 68 | for_each_napot_order(order) { |
| 69 | if (napot_cont_size(order) == sz) { |
| 70 | pte = pte_alloc_huge(mm, pmd, addr & napot_cont_mask(order)); |
| 71 | break; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | out: |
| 76 | if (pte) { |
| 77 | pte_t pteval = ptep_get_lockless(pte); |
| 78 | |
| 79 | WARN_ON_ONCE(pte_present(pteval) && !pte_huge(pteval)); |
| 80 | } |
| 81 | return pte; |
| 82 | } |
| 83 | |
| 84 | pte_t *huge_pte_offset(struct mm_struct *mm, |
| 85 | unsigned long addr, |
| 86 | unsigned long sz) |
| 87 | { |
| 88 | unsigned long order; |
| 89 | pte_t *pte = NULL; |
| 90 | pgd_t *pgd; |
| 91 | p4d_t *p4d; |
| 92 | pud_t *pud; |
| 93 | pmd_t *pmd; |
| 94 | |
| 95 | pgd = pgd_offset(mm, addr); |
| 96 | if (!pgd_present(pgdp_get(pgd))) |
| 97 | return NULL; |
| 98 | |
| 99 | p4d = p4d_offset(pgd, addr); |
| 100 | if (!p4d_present(p4dp_get(p4d))) |
| 101 | return NULL; |
| 102 | |
| 103 | pud = pud_offset(p4d, addr); |
| 104 | if (sz == PUD_SIZE) |
| 105 | /* must be pud huge, non-present or none */ |
| 106 | return (pte_t *)pud; |
| 107 | |
| 108 | if (!pud_present(pudp_get(pud))) |
| 109 | return NULL; |
| 110 | |
| 111 | pmd = pmd_offset(pud, addr); |
| 112 | if (sz == PMD_SIZE) |
| 113 | /* must be pmd huge, non-present or none */ |
| 114 | return (pte_t *)pmd; |
| 115 | |
| 116 | if (!pmd_present(pmdp_get(pmd))) |
| 117 | return NULL; |
| 118 | |
| 119 | for_each_napot_order(order) { |
| 120 | if (napot_cont_size(order) == sz) { |
| 121 | pte = pte_offset_huge(pmd, addr & napot_cont_mask(order)); |
| 122 | break; |
| 123 | } |
| 124 | } |
| 125 | return pte; |
| 126 | } |
| 127 | |
| 128 | static pte_t get_clear_contig(struct mm_struct *mm, |
| 129 | unsigned long addr, |
| 130 | pte_t *ptep, |
| 131 | unsigned long pte_num) |
| 132 | { |
| 133 | pte_t orig_pte = ptep_get(ptep); |
| 134 | unsigned long i; |
| 135 | |
| 136 | for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) { |
| 137 | pte_t pte = ptep_get_and_clear(mm, addr, ptep); |
| 138 | |
| 139 | if (pte_dirty(pte)) |
| 140 | orig_pte = pte_mkdirty(orig_pte); |
| 141 | |
| 142 | if (pte_young(pte)) |
| 143 | orig_pte = pte_mkyoung(orig_pte); |
| 144 | } |
| 145 | |
| 146 | return orig_pte; |
| 147 | } |
| 148 | |
| 149 | static pte_t get_clear_contig_flush(struct mm_struct *mm, |
| 150 | unsigned long addr, |
| 151 | pte_t *ptep, |
| 152 | unsigned long pte_num) |
| 153 | { |
| 154 | pte_t orig_pte = get_clear_contig(mm, addr, ptep, pte_num); |
| 155 | struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0); |
| 156 | bool valid = !pte_none(orig_pte); |
| 157 | |
| 158 | if (valid) |
| 159 | flush_tlb_range(&vma, addr, addr + (PAGE_SIZE * pte_num)); |
| 160 | |
| 161 | return orig_pte; |
| 162 | } |
| 163 | |
| 164 | pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) |
| 165 | { |
| 166 | unsigned long order; |
| 167 | |
| 168 | for_each_napot_order(order) { |
| 169 | if (shift == napot_cont_shift(order)) { |
| 170 | entry = pte_mknapot(entry, order); |
| 171 | break; |
| 172 | } |
| 173 | } |
| 174 | if (order == NAPOT_ORDER_MAX) |
| 175 | entry = pte_mkhuge(entry); |
| 176 | |
| 177 | return entry; |
| 178 | } |
| 179 | |
| 180 | void set_huge_pte_at(struct mm_struct *mm, |
| 181 | unsigned long addr, |
| 182 | pte_t *ptep, |
| 183 | pte_t pte, |
| 184 | unsigned long sz) |
| 185 | { |
| 186 | unsigned long hugepage_shift; |
| 187 | int i, pte_num; |
| 188 | |
| 189 | if (sz >= PGDIR_SIZE) |
| 190 | hugepage_shift = PGDIR_SHIFT; |
| 191 | else if (sz >= P4D_SIZE) |
| 192 | hugepage_shift = P4D_SHIFT; |
| 193 | else if (sz >= PUD_SIZE) |
| 194 | hugepage_shift = PUD_SHIFT; |
| 195 | else if (sz >= PMD_SIZE) |
| 196 | hugepage_shift = PMD_SHIFT; |
| 197 | else |
| 198 | hugepage_shift = PAGE_SHIFT; |
| 199 | |
| 200 | pte_num = sz >> hugepage_shift; |
| 201 | for (i = 0; i < pte_num; i++, ptep++, addr += (1 << hugepage_shift)) |
| 202 | set_pte_at(mm, addr, ptep, pte); |
| 203 | } |
| 204 | |
| 205 | int huge_ptep_set_access_flags(struct vm_area_struct *vma, |
| 206 | unsigned long addr, |
| 207 | pte_t *ptep, |
| 208 | pte_t pte, |
| 209 | int dirty) |
| 210 | { |
| 211 | struct mm_struct *mm = vma->vm_mm; |
| 212 | unsigned long order; |
| 213 | pte_t orig_pte; |
| 214 | int i, pte_num; |
| 215 | |
| 216 | if (!pte_napot(pte)) |
| 217 | return ptep_set_access_flags(vma, addr, ptep, pte, dirty); |
| 218 | |
| 219 | order = napot_cont_order(pte); |
| 220 | pte_num = napot_pte_num(order); |
| 221 | ptep = huge_pte_offset(mm, addr, napot_cont_size(order)); |
| 222 | orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num); |
| 223 | |
| 224 | if (pte_dirty(orig_pte)) |
| 225 | pte = pte_mkdirty(pte); |
| 226 | |
| 227 | if (pte_young(orig_pte)) |
| 228 | pte = pte_mkyoung(pte); |
| 229 | |
| 230 | for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) |
| 231 | set_pte_at(mm, addr, ptep, pte); |
| 232 | |
| 233 | return true; |
| 234 | } |
| 235 | |
| 236 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, |
| 237 | unsigned long addr, |
| 238 | pte_t *ptep) |
| 239 | { |
| 240 | pte_t orig_pte = ptep_get(ptep); |
| 241 | int pte_num; |
| 242 | |
| 243 | if (!pte_napot(orig_pte)) |
| 244 | return ptep_get_and_clear(mm, addr, ptep); |
| 245 | |
| 246 | pte_num = napot_pte_num(napot_cont_order(orig_pte)); |
| 247 | |
| 248 | return get_clear_contig(mm, addr, ptep, pte_num); |
| 249 | } |
| 250 | |
| 251 | void huge_ptep_set_wrprotect(struct mm_struct *mm, |
| 252 | unsigned long addr, |
| 253 | pte_t *ptep) |
| 254 | { |
| 255 | pte_t pte = ptep_get(ptep); |
| 256 | unsigned long order; |
| 257 | pte_t orig_pte; |
| 258 | int i, pte_num; |
| 259 | |
| 260 | if (!pte_napot(pte)) { |
| 261 | ptep_set_wrprotect(mm, addr, ptep); |
| 262 | return; |
| 263 | } |
| 264 | |
| 265 | order = napot_cont_order(pte); |
| 266 | pte_num = napot_pte_num(order); |
| 267 | ptep = huge_pte_offset(mm, addr, napot_cont_size(order)); |
| 268 | orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num); |
| 269 | |
| 270 | orig_pte = pte_wrprotect(orig_pte); |
| 271 | |
| 272 | for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) |
| 273 | set_pte_at(mm, addr, ptep, orig_pte); |
| 274 | } |
| 275 | |
| 276 | pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, |
| 277 | unsigned long addr, |
| 278 | pte_t *ptep) |
| 279 | { |
| 280 | pte_t pte = ptep_get(ptep); |
| 281 | int pte_num; |
| 282 | |
| 283 | if (!pte_napot(pte)) |
| 284 | return ptep_clear_flush(vma, addr, ptep); |
| 285 | |
| 286 | pte_num = napot_pte_num(napot_cont_order(pte)); |
| 287 | |
| 288 | return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num); |
| 289 | } |
| 290 | |
| 291 | void huge_pte_clear(struct mm_struct *mm, |
| 292 | unsigned long addr, |
| 293 | pte_t *ptep, |
| 294 | unsigned long sz) |
| 295 | { |
| 296 | pte_t pte = ptep_get(ptep); |
| 297 | int i, pte_num; |
| 298 | |
| 299 | if (!pte_napot(pte)) { |
| 300 | pte_clear(mm, addr, ptep); |
| 301 | return; |
| 302 | } |
| 303 | |
| 304 | pte_num = napot_pte_num(napot_cont_order(pte)); |
| 305 | for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) |
| 306 | pte_clear(mm, addr, ptep); |
| 307 | } |
| 308 | |
| 309 | static __init bool is_napot_size(unsigned long size) |
| 310 | { |
| 311 | unsigned long order; |
| 312 | |
| 313 | if (!has_svnapot()) |
| 314 | return false; |
| 315 | |
| 316 | for_each_napot_order(order) { |
| 317 | if (size == napot_cont_size(order)) |
| 318 | return true; |
| 319 | } |
| 320 | return false; |
| 321 | } |
| 322 | |
| 323 | static __init int napot_hugetlbpages_init(void) |
| 324 | { |
| 325 | if (has_svnapot()) { |
| 326 | unsigned long order; |
| 327 | |
| 328 | for_each_napot_order(order) |
| 329 | hugetlb_add_hstate(order); |
| 330 | } |
| 331 | return 0; |
| 332 | } |
| 333 | arch_initcall(napot_hugetlbpages_init); |
| 334 | |
| 335 | #else |
| 336 | |
| 337 | static __init bool is_napot_size(unsigned long size) |
| 338 | { |
| 339 | return false; |
| 340 | } |
| 341 | |
| 342 | #endif /*CONFIG_RISCV_ISA_SVNAPOT*/ |
| 343 | |
| 344 | int pud_huge(pud_t pud) |
| 345 | { |
| 346 | return pud_leaf(pud); |
| 347 | } |
| 348 | |
| 349 | int pmd_huge(pmd_t pmd) |
| 350 | { |
| 351 | return pmd_leaf(pmd); |
| 352 | } |
| 353 | |
| 354 | bool __init arch_hugetlb_valid_size(unsigned long size) |
| 355 | { |
| 356 | if (size == HPAGE_SIZE) |
| 357 | return true; |
| 358 | else if (IS_ENABLED(CONFIG_64BIT) && size == PUD_SIZE) |
| 359 | return true; |
| 360 | else if (is_napot_size(size)) |
| 361 | return true; |
| 362 | else |
| 363 | return false; |
| 364 | } |
| 365 | |
| 366 | #ifdef CONFIG_CONTIG_ALLOC |
| 367 | static __init int gigantic_pages_init(void) |
| 368 | { |
| 369 | /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */ |
| 370 | if (IS_ENABLED(CONFIG_64BIT)) |
| 371 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); |
| 372 | return 0; |
| 373 | } |
| 374 | arch_initcall(gigantic_pages_init); |
| 375 | #endif |