1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 ARM Ltd. 4 */ 5 #ifndef __ASM_PGTABLE_H 6 #define __ASM_PGTABLE_H 7 8 #include <asm/bug.h> 9 #include <asm/proc-fns.h> 10 11 #include <asm/memory.h> 12 #include <asm/mte.h> 13 #include <asm/pgtable-hwdef.h> 14 #include <asm/pgtable-prot.h> 15 #include <asm/tlbflush.h> 16 17 /* 18 * VMALLOC range. 19 * 20 * VMALLOC_START: beginning of the kernel vmalloc space 21 * VMALLOC_END: extends to the available space below vmemmap, PCI I/O space 22 * and fixed mappings 23 */ 24 #define VMALLOC_START (MODULES_END) 25 #define VMALLOC_END (- PUD_SIZE - VMEMMAP_SIZE - SZ_64K) 26 27 #define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT)) 28 29 #define FIRST_USER_ADDRESS 0UL 30 31 #ifndef __ASSEMBLY__ 32 33 #include <asm/cmpxchg.h> 34 #include <asm/fixmap.h> 35 #include <linux/mmdebug.h> 36 #include <linux/mm_types.h> 37 #include <linux/sched.h> 38 39 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 40 #define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE 41 42 /* Set stride and tlb_level in flush_*_tlb_range */ 43 #define flush_pmd_tlb_range(vma, addr, end) \ 44 __flush_tlb_range(vma, addr, end, PMD_SIZE, false, 2) 45 #define flush_pud_tlb_range(vma, addr, end) \ 46 __flush_tlb_range(vma, addr, end, PUD_SIZE, false, 1) 47 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 48 49 /* 50 * Outside of a few very special situations (e.g. hibernation), we always 51 * use broadcast TLB invalidation instructions, therefore a spurious page 52 * fault on one CPU which has been handled concurrently by another CPU 53 * does not need to perform additional invalidation. 54 */ 55 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0) 56 57 /* 58 * ZERO_PAGE is a global shared page that is always zero: used 59 * for zero-mapped memory areas etc.. 60 */ 61 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 62 #define ZERO_PAGE(vaddr) phys_to_page(__pa_symbol(empty_zero_page)) 63 64 #define pte_ERROR(e) \ 65 pr_err("%s:%d: bad pte %016llx.\n", __FILE__, __LINE__, pte_val(e)) 66 67 /* 68 * Macros to convert between a physical address and its placement in a 69 * page table entry, taking care of 52-bit addresses. 70 */ 71 #ifdef CONFIG_ARM64_PA_BITS_52 72 #define __pte_to_phys(pte) \ 73 ((pte_val(pte) & PTE_ADDR_LOW) | ((pte_val(pte) & PTE_ADDR_HIGH) << 36)) 74 #define __phys_to_pte_val(phys) (((phys) | ((phys) >> 36)) & PTE_ADDR_MASK) 75 #else 76 #define __pte_to_phys(pte) (pte_val(pte) & PTE_ADDR_MASK) 77 #define __phys_to_pte_val(phys) (phys) 78 #endif 79 80 #define pte_pfn(pte) (__pte_to_phys(pte) >> PAGE_SHIFT) 81 #define pfn_pte(pfn,prot) \ 82 __pte(__phys_to_pte_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) 83 84 #define pte_none(pte) (!pte_val(pte)) 85 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) 86 #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 87 88 /* 89 * The following only work if pte_present(). Undefined behaviour otherwise. 90 */ 91 #define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))) 92 #define pte_young(pte) (!!(pte_val(pte) & PTE_AF)) 93 #define pte_special(pte) (!!(pte_val(pte) & PTE_SPECIAL)) 94 #define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE)) 95 #define pte_user_exec(pte) (!(pte_val(pte) & PTE_UXN)) 96 #define pte_cont(pte) (!!(pte_val(pte) & PTE_CONT)) 97 #define pte_devmap(pte) (!!(pte_val(pte) & PTE_DEVMAP)) 98 #define pte_tagged(pte) ((pte_val(pte) & PTE_ATTRINDX_MASK) == \ 99 PTE_ATTRINDX(MT_NORMAL_TAGGED)) 100 101 #define pte_cont_addr_end(addr, end) \ 102 ({ unsigned long __boundary = ((addr) + CONT_PTE_SIZE) & CONT_PTE_MASK; \ 103 (__boundary - 1 < (end) - 1) ? __boundary : (end); \ 104 }) 105 106 #define pmd_cont_addr_end(addr, end) \ 107 ({ unsigned long __boundary = ((addr) + CONT_PMD_SIZE) & CONT_PMD_MASK; \ 108 (__boundary - 1 < (end) - 1) ? __boundary : (end); \ 109 }) 110 111 #define pte_hw_dirty(pte) (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY)) 112 #define pte_sw_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY)) 113 #define pte_dirty(pte) (pte_sw_dirty(pte) || pte_hw_dirty(pte)) 114 115 #define pte_valid(pte) (!!(pte_val(pte) & PTE_VALID)) 116 #define pte_valid_not_user(pte) \ 117 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID) 118 #define pte_valid_user(pte) \ 119 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) 120 121 /* 122 * Could the pte be present in the TLB? We must check mm_tlb_flush_pending 123 * so that we don't erroneously return false for pages that have been 124 * remapped as PROT_NONE but are yet to be flushed from the TLB. 125 * Note that we can't make any assumptions based on the state of the access 126 * flag, since ptep_clear_flush_young() elides a DSB when invalidating the 127 * TLB. 128 */ 129 #define pte_accessible(mm, pte) \ 130 (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid(pte)) 131 132 /* 133 * p??_access_permitted() is true for valid user mappings (subject to the 134 * write permission check). PROT_NONE mappings do not have the PTE_VALID bit 135 * set. 136 */ 137 #define pte_access_permitted(pte, write) \ 138 (pte_valid_user(pte) && (!(write) || pte_write(pte))) 139 #define pmd_access_permitted(pmd, write) \ 140 (pte_access_permitted(pmd_pte(pmd), (write))) 141 #define pud_access_permitted(pud, write) \ 142 (pte_access_permitted(pud_pte(pud), (write))) 143 144 static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot) 145 { 146 pte_val(pte) &= ~pgprot_val(prot); 147 return pte; 148 } 149 150 static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot) 151 { 152 pte_val(pte) |= pgprot_val(prot); 153 return pte; 154 } 155 156 static inline pmd_t clear_pmd_bit(pmd_t pmd, pgprot_t prot) 157 { 158 pmd_val(pmd) &= ~pgprot_val(prot); 159 return pmd; 160 } 161 162 static inline pmd_t set_pmd_bit(pmd_t pmd, pgprot_t prot) 163 { 164 pmd_val(pmd) |= pgprot_val(prot); 165 return pmd; 166 } 167 168 static inline pte_t pte_mkwrite(pte_t pte) 169 { 170 pte = set_pte_bit(pte, __pgprot(PTE_WRITE)); 171 pte = clear_pte_bit(pte, __pgprot(PTE_RDONLY)); 172 return pte; 173 } 174 175 static inline pte_t pte_mkclean(pte_t pte) 176 { 177 pte = clear_pte_bit(pte, __pgprot(PTE_DIRTY)); 178 pte = set_pte_bit(pte, __pgprot(PTE_RDONLY)); 179 180 return pte; 181 } 182 183 static inline pte_t pte_mkdirty(pte_t pte) 184 { 185 pte = set_pte_bit(pte, __pgprot(PTE_DIRTY)); 186 187 if (pte_write(pte)) 188 pte = clear_pte_bit(pte, __pgprot(PTE_RDONLY)); 189 190 return pte; 191 } 192 193 static inline pte_t pte_wrprotect(pte_t pte) 194 { 195 /* 196 * If hardware-dirty (PTE_WRITE/DBM bit set and PTE_RDONLY 197 * clear), set the PTE_DIRTY bit. 198 */ 199 if (pte_hw_dirty(pte)) 200 pte = pte_mkdirty(pte); 201 202 pte = clear_pte_bit(pte, __pgprot(PTE_WRITE)); 203 pte = set_pte_bit(pte, __pgprot(PTE_RDONLY)); 204 return pte; 205 } 206 207 static inline pte_t pte_mkold(pte_t pte) 208 { 209 return clear_pte_bit(pte, __pgprot(PTE_AF)); 210 } 211 212 static inline pte_t pte_mkyoung(pte_t pte) 213 { 214 return set_pte_bit(pte, __pgprot(PTE_AF)); 215 } 216 217 static inline pte_t pte_mkspecial(pte_t pte) 218 { 219 return set_pte_bit(pte, __pgprot(PTE_SPECIAL)); 220 } 221 222 static inline pte_t pte_mkcont(pte_t pte) 223 { 224 pte = set_pte_bit(pte, __pgprot(PTE_CONT)); 225 return set_pte_bit(pte, __pgprot(PTE_TYPE_PAGE)); 226 } 227 228 static inline pte_t pte_mknoncont(pte_t pte) 229 { 230 return clear_pte_bit(pte, __pgprot(PTE_CONT)); 231 } 232 233 static inline pte_t pte_mkpresent(pte_t pte) 234 { 235 return set_pte_bit(pte, __pgprot(PTE_VALID)); 236 } 237 238 static inline pmd_t pmd_mkcont(pmd_t pmd) 239 { 240 return __pmd(pmd_val(pmd) | PMD_SECT_CONT); 241 } 242 243 static inline pte_t pte_mkdevmap(pte_t pte) 244 { 245 return set_pte_bit(pte, __pgprot(PTE_DEVMAP | PTE_SPECIAL)); 246 } 247 248 static inline void set_pte(pte_t *ptep, pte_t pte) 249 { 250 WRITE_ONCE(*ptep, pte); 251 252 /* 253 * Only if the new pte is valid and kernel, otherwise TLB maintenance 254 * or update_mmu_cache() have the necessary barriers. 255 */ 256 if (pte_valid_not_user(pte)) { 257 dsb(ishst); 258 isb(); 259 } 260 } 261 262 extern void __sync_icache_dcache(pte_t pteval); 263 264 /* 265 * PTE bits configuration in the presence of hardware Dirty Bit Management 266 * (PTE_WRITE == PTE_DBM): 267 * 268 * Dirty Writable | PTE_RDONLY PTE_WRITE PTE_DIRTY (sw) 269 * 0 0 | 1 0 0 270 * 0 1 | 1 1 0 271 * 1 0 | 1 0 1 272 * 1 1 | 0 1 x 273 * 274 * When hardware DBM is not present, the sofware PTE_DIRTY bit is updated via 275 * the page fault mechanism. Checking the dirty status of a pte becomes: 276 * 277 * PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY) 278 */ 279 280 static inline void __check_racy_pte_update(struct mm_struct *mm, pte_t *ptep, 281 pte_t pte) 282 { 283 pte_t old_pte; 284 285 if (!IS_ENABLED(CONFIG_DEBUG_VM)) 286 return; 287 288 old_pte = READ_ONCE(*ptep); 289 290 if (!pte_valid(old_pte) || !pte_valid(pte)) 291 return; 292 if (mm != current->active_mm && atomic_read(&mm->mm_users) <= 1) 293 return; 294 295 /* 296 * Check for potential race with hardware updates of the pte 297 * (ptep_set_access_flags safely changes valid ptes without going 298 * through an invalid entry). 299 */ 300 VM_WARN_ONCE(!pte_young(pte), 301 "%s: racy access flag clearing: 0x%016llx -> 0x%016llx", 302 __func__, pte_val(old_pte), pte_val(pte)); 303 VM_WARN_ONCE(pte_write(old_pte) && !pte_dirty(pte), 304 "%s: racy dirty state clearing: 0x%016llx -> 0x%016llx", 305 __func__, pte_val(old_pte), pte_val(pte)); 306 } 307 308 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, 309 pte_t *ptep, pte_t pte) 310 { 311 if (pte_present(pte) && pte_user_exec(pte) && !pte_special(pte)) 312 __sync_icache_dcache(pte); 313 314 if (system_supports_mte() && 315 pte_present(pte) && pte_tagged(pte) && !pte_special(pte)) 316 mte_sync_tags(ptep, pte); 317 318 __check_racy_pte_update(mm, ptep, pte); 319 320 set_pte(ptep, pte); 321 } 322 323 /* 324 * Huge pte definitions. 325 */ 326 #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) 327 328 /* 329 * Hugetlb definitions. 330 */ 331 #define HUGE_MAX_HSTATE 4 332 #define HPAGE_SHIFT PMD_SHIFT 333 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 334 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 335 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 336 337 static inline pte_t pgd_pte(pgd_t pgd) 338 { 339 return __pte(pgd_val(pgd)); 340 } 341 342 static inline pte_t p4d_pte(p4d_t p4d) 343 { 344 return __pte(p4d_val(p4d)); 345 } 346 347 static inline pte_t pud_pte(pud_t pud) 348 { 349 return __pte(pud_val(pud)); 350 } 351 352 static inline pud_t pte_pud(pte_t pte) 353 { 354 return __pud(pte_val(pte)); 355 } 356 357 static inline pmd_t pud_pmd(pud_t pud) 358 { 359 return __pmd(pud_val(pud)); 360 } 361 362 static inline pte_t pmd_pte(pmd_t pmd) 363 { 364 return __pte(pmd_val(pmd)); 365 } 366 367 static inline pmd_t pte_pmd(pte_t pte) 368 { 369 return __pmd(pte_val(pte)); 370 } 371 372 static inline pgprot_t mk_pud_sect_prot(pgprot_t prot) 373 { 374 return __pgprot((pgprot_val(prot) & ~PUD_TABLE_BIT) | PUD_TYPE_SECT); 375 } 376 377 static inline pgprot_t mk_pmd_sect_prot(pgprot_t prot) 378 { 379 return __pgprot((pgprot_val(prot) & ~PMD_TABLE_BIT) | PMD_TYPE_SECT); 380 } 381 382 #ifdef CONFIG_NUMA_BALANCING 383 /* 384 * See the comment in include/linux/pgtable.h 385 */ 386 static inline int pte_protnone(pte_t pte) 387 { 388 return (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) == PTE_PROT_NONE; 389 } 390 391 static inline int pmd_protnone(pmd_t pmd) 392 { 393 return pte_protnone(pmd_pte(pmd)); 394 } 395 #endif 396 397 #define pmd_present_invalid(pmd) (!!(pmd_val(pmd) & PMD_PRESENT_INVALID)) 398 399 static inline int pmd_present(pmd_t pmd) 400 { 401 return pte_present(pmd_pte(pmd)) || pmd_present_invalid(pmd); 402 } 403 404 /* 405 * THP definitions. 406 */ 407 408 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 409 static inline int pmd_trans_huge(pmd_t pmd) 410 { 411 return pmd_val(pmd) && pmd_present(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT); 412 } 413 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 414 415 #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd)) 416 #define pmd_young(pmd) pte_young(pmd_pte(pmd)) 417 #define pmd_valid(pmd) pte_valid(pmd_pte(pmd)) 418 #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) 419 #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) 420 #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) 421 #define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd))) 422 #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) 423 #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) 424 425 static inline pmd_t pmd_mkinvalid(pmd_t pmd) 426 { 427 pmd = set_pmd_bit(pmd, __pgprot(PMD_PRESENT_INVALID)); 428 pmd = clear_pmd_bit(pmd, __pgprot(PMD_SECT_VALID)); 429 430 return pmd; 431 } 432 433 #define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd)) 434 435 #define pmd_write(pmd) pte_write(pmd_pte(pmd)) 436 437 #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) 438 439 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 440 #define pmd_devmap(pmd) pte_devmap(pmd_pte(pmd)) 441 #endif 442 static inline pmd_t pmd_mkdevmap(pmd_t pmd) 443 { 444 return pte_pmd(set_pte_bit(pmd_pte(pmd), __pgprot(PTE_DEVMAP))); 445 } 446 447 #define __pmd_to_phys(pmd) __pte_to_phys(pmd_pte(pmd)) 448 #define __phys_to_pmd_val(phys) __phys_to_pte_val(phys) 449 #define pmd_pfn(pmd) ((__pmd_to_phys(pmd) & PMD_MASK) >> PAGE_SHIFT) 450 #define pfn_pmd(pfn,prot) __pmd(__phys_to_pmd_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) 451 #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) 452 453 #define pud_young(pud) pte_young(pud_pte(pud)) 454 #define pud_mkyoung(pud) pte_pud(pte_mkyoung(pud_pte(pud))) 455 #define pud_write(pud) pte_write(pud_pte(pud)) 456 457 #define pud_mkhuge(pud) (__pud(pud_val(pud) & ~PUD_TABLE_BIT)) 458 459 #define __pud_to_phys(pud) __pte_to_phys(pud_pte(pud)) 460 #define __phys_to_pud_val(phys) __phys_to_pte_val(phys) 461 #define pud_pfn(pud) ((__pud_to_phys(pud) & PUD_MASK) >> PAGE_SHIFT) 462 #define pfn_pud(pfn,prot) __pud(__phys_to_pud_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)) 463 464 #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd)) 465 #define set_pud_at(mm, addr, pudp, pud) set_pte_at(mm, addr, (pte_t *)pudp, pud_pte(pud)) 466 467 #define __p4d_to_phys(p4d) __pte_to_phys(p4d_pte(p4d)) 468 #define __phys_to_p4d_val(phys) __phys_to_pte_val(phys) 469 470 #define __pgd_to_phys(pgd) __pte_to_phys(pgd_pte(pgd)) 471 #define __phys_to_pgd_val(phys) __phys_to_pte_val(phys) 472 473 #define __pgprot_modify(prot,mask,bits) \ 474 __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) 475 476 #define pgprot_nx(prot) \ 477 __pgprot_modify(prot, PTE_MAYBE_GP, PTE_PXN) 478 479 /* 480 * Mark the prot value as uncacheable and unbufferable. 481 */ 482 #define pgprot_noncached(prot) \ 483 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN) 484 #define pgprot_writecombine(prot) \ 485 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN) 486 #define pgprot_device(prot) \ 487 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN) 488 /* 489 * DMA allocations for non-coherent devices use what the Arm architecture calls 490 * "Normal non-cacheable" memory, which permits speculation, unaligned accesses 491 * and merging of writes. This is different from "Device-nGnR[nE]" memory which 492 * is intended for MMIO and thus forbids speculation, preserves access size, 493 * requires strict alignment and can also force write responses to come from the 494 * endpoint. 495 */ 496 #define pgprot_dmacoherent(prot) \ 497 __pgprot_modify(prot, PTE_ATTRINDX_MASK, \ 498 PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN) 499 500 #define __HAVE_PHYS_MEM_ACCESS_PROT 501 struct file; 502 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, 503 unsigned long size, pgprot_t vma_prot); 504 505 #define pmd_none(pmd) (!pmd_val(pmd)) 506 507 #define pmd_bad(pmd) (!(pmd_val(pmd) & PMD_TABLE_BIT)) 508 509 #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 510 PMD_TYPE_TABLE) 511 #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ 512 PMD_TYPE_SECT) 513 #define pmd_leaf(pmd) pmd_sect(pmd) 514 515 #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3 516 static inline bool pud_sect(pud_t pud) { return false; } 517 static inline bool pud_table(pud_t pud) { return true; } 518 #else 519 #define pud_sect(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ 520 PUD_TYPE_SECT) 521 #define pud_table(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ 522 PUD_TYPE_TABLE) 523 #endif 524 525 extern pgd_t init_pg_dir[PTRS_PER_PGD]; 526 extern pgd_t init_pg_end[]; 527 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 528 extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; 529 extern pgd_t idmap_pg_end[]; 530 extern pgd_t tramp_pg_dir[PTRS_PER_PGD]; 531 532 extern void set_swapper_pgd(pgd_t *pgdp, pgd_t pgd); 533 534 static inline bool in_swapper_pgdir(void *addr) 535 { 536 return ((unsigned long)addr & PAGE_MASK) == 537 ((unsigned long)swapper_pg_dir & PAGE_MASK); 538 } 539 540 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) 541 { 542 #ifdef __PAGETABLE_PMD_FOLDED 543 if (in_swapper_pgdir(pmdp)) { 544 set_swapper_pgd((pgd_t *)pmdp, __pgd(pmd_val(pmd))); 545 return; 546 } 547 #endif /* __PAGETABLE_PMD_FOLDED */ 548 549 WRITE_ONCE(*pmdp, pmd); 550 551 if (pmd_valid(pmd)) { 552 dsb(ishst); 553 isb(); 554 } 555 } 556 557 static inline void pmd_clear(pmd_t *pmdp) 558 { 559 set_pmd(pmdp, __pmd(0)); 560 } 561 562 static inline phys_addr_t pmd_page_paddr(pmd_t pmd) 563 { 564 return __pmd_to_phys(pmd); 565 } 566 567 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 568 { 569 return (unsigned long)__va(pmd_page_paddr(pmd)); 570 } 571 572 /* Find an entry in the third-level page table. */ 573 #define pte_offset_phys(dir,addr) (pmd_page_paddr(READ_ONCE(*(dir))) + pte_index(addr) * sizeof(pte_t)) 574 575 #define pte_set_fixmap(addr) ((pte_t *)set_fixmap_offset(FIX_PTE, addr)) 576 #define pte_set_fixmap_offset(pmd, addr) pte_set_fixmap(pte_offset_phys(pmd, addr)) 577 #define pte_clear_fixmap() clear_fixmap(FIX_PTE) 578 579 #define pmd_page(pmd) phys_to_page(__pmd_to_phys(pmd)) 580 581 /* use ONLY for statically allocated translation tables */ 582 #define pte_offset_kimg(dir,addr) ((pte_t *)__phys_to_kimg(pte_offset_phys((dir), (addr)))) 583 584 /* 585 * Conversion functions: convert a page and protection to a page entry, 586 * and a page entry and page directory to the page they refer to. 587 */ 588 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) 589 590 #if CONFIG_PGTABLE_LEVELS > 2 591 592 #define pmd_ERROR(e) \ 593 pr_err("%s:%d: bad pmd %016llx.\n", __FILE__, __LINE__, pmd_val(e)) 594 595 #define pud_none(pud) (!pud_val(pud)) 596 #define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT)) 597 #define pud_present(pud) pte_present(pud_pte(pud)) 598 #define pud_leaf(pud) pud_sect(pud) 599 #define pud_valid(pud) pte_valid(pud_pte(pud)) 600 601 static inline void set_pud(pud_t *pudp, pud_t pud) 602 { 603 #ifdef __PAGETABLE_PUD_FOLDED 604 if (in_swapper_pgdir(pudp)) { 605 set_swapper_pgd((pgd_t *)pudp, __pgd(pud_val(pud))); 606 return; 607 } 608 #endif /* __PAGETABLE_PUD_FOLDED */ 609 610 WRITE_ONCE(*pudp, pud); 611 612 if (pud_valid(pud)) { 613 dsb(ishst); 614 isb(); 615 } 616 } 617 618 static inline void pud_clear(pud_t *pudp) 619 { 620 set_pud(pudp, __pud(0)); 621 } 622 623 static inline phys_addr_t pud_page_paddr(pud_t pud) 624 { 625 return __pud_to_phys(pud); 626 } 627 628 static inline unsigned long pud_page_vaddr(pud_t pud) 629 { 630 return (unsigned long)__va(pud_page_paddr(pud)); 631 } 632 633 /* Find an entry in the second-level page table. */ 634 #define pmd_offset_phys(dir, addr) (pud_page_paddr(READ_ONCE(*(dir))) + pmd_index(addr) * sizeof(pmd_t)) 635 636 #define pmd_set_fixmap(addr) ((pmd_t *)set_fixmap_offset(FIX_PMD, addr)) 637 #define pmd_set_fixmap_offset(pud, addr) pmd_set_fixmap(pmd_offset_phys(pud, addr)) 638 #define pmd_clear_fixmap() clear_fixmap(FIX_PMD) 639 640 #define pud_page(pud) phys_to_page(__pud_to_phys(pud)) 641 642 /* use ONLY for statically allocated translation tables */ 643 #define pmd_offset_kimg(dir,addr) ((pmd_t *)__phys_to_kimg(pmd_offset_phys((dir), (addr)))) 644 645 #else 646 647 #define pud_page_paddr(pud) ({ BUILD_BUG(); 0; }) 648 649 /* Match pmd_offset folding in <asm/generic/pgtable-nopmd.h> */ 650 #define pmd_set_fixmap(addr) NULL 651 #define pmd_set_fixmap_offset(pudp, addr) ((pmd_t *)pudp) 652 #define pmd_clear_fixmap() 653 654 #define pmd_offset_kimg(dir,addr) ((pmd_t *)dir) 655 656 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 657 658 #if CONFIG_PGTABLE_LEVELS > 3 659 660 #define pud_ERROR(e) \ 661 pr_err("%s:%d: bad pud %016llx.\n", __FILE__, __LINE__, pud_val(e)) 662 663 #define p4d_none(p4d) (!p4d_val(p4d)) 664 #define p4d_bad(p4d) (!(p4d_val(p4d) & 2)) 665 #define p4d_present(p4d) (p4d_val(p4d)) 666 667 static inline void set_p4d(p4d_t *p4dp, p4d_t p4d) 668 { 669 if (in_swapper_pgdir(p4dp)) { 670 set_swapper_pgd((pgd_t *)p4dp, __pgd(p4d_val(p4d))); 671 return; 672 } 673 674 WRITE_ONCE(*p4dp, p4d); 675 dsb(ishst); 676 isb(); 677 } 678 679 static inline void p4d_clear(p4d_t *p4dp) 680 { 681 set_p4d(p4dp, __p4d(0)); 682 } 683 684 static inline phys_addr_t p4d_page_paddr(p4d_t p4d) 685 { 686 return __p4d_to_phys(p4d); 687 } 688 689 static inline unsigned long p4d_page_vaddr(p4d_t p4d) 690 { 691 return (unsigned long)__va(p4d_page_paddr(p4d)); 692 } 693 694 /* Find an entry in the frst-level page table. */ 695 #define pud_offset_phys(dir, addr) (p4d_page_paddr(READ_ONCE(*(dir))) + pud_index(addr) * sizeof(pud_t)) 696 697 #define pud_set_fixmap(addr) ((pud_t *)set_fixmap_offset(FIX_PUD, addr)) 698 #define pud_set_fixmap_offset(p4d, addr) pud_set_fixmap(pud_offset_phys(p4d, addr)) 699 #define pud_clear_fixmap() clear_fixmap(FIX_PUD) 700 701 #define p4d_page(p4d) pfn_to_page(__phys_to_pfn(__p4d_to_phys(p4d))) 702 703 /* use ONLY for statically allocated translation tables */ 704 #define pud_offset_kimg(dir,addr) ((pud_t *)__phys_to_kimg(pud_offset_phys((dir), (addr)))) 705 706 #else 707 708 #define p4d_page_paddr(p4d) ({ BUILD_BUG(); 0;}) 709 #define pgd_page_paddr(pgd) ({ BUILD_BUG(); 0;}) 710 711 /* Match pud_offset folding in <asm/generic/pgtable-nopud.h> */ 712 #define pud_set_fixmap(addr) NULL 713 #define pud_set_fixmap_offset(pgdp, addr) ((pud_t *)pgdp) 714 #define pud_clear_fixmap() 715 716 #define pud_offset_kimg(dir,addr) ((pud_t *)dir) 717 718 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 719 720 #define pgd_ERROR(e) \ 721 pr_err("%s:%d: bad pgd %016llx.\n", __FILE__, __LINE__, pgd_val(e)) 722 723 #define pgd_set_fixmap(addr) ((pgd_t *)set_fixmap_offset(FIX_PGD, addr)) 724 #define pgd_clear_fixmap() clear_fixmap(FIX_PGD) 725 726 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 727 { 728 /* 729 * Normal and Normal-Tagged are two different memory types and indices 730 * in MAIR_EL1. The mask below has to include PTE_ATTRINDX_MASK. 731 */ 732 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | 733 PTE_PROT_NONE | PTE_VALID | PTE_WRITE | PTE_GP | 734 PTE_ATTRINDX_MASK; 735 /* preserve the hardware dirty information */ 736 if (pte_hw_dirty(pte)) 737 pte = pte_mkdirty(pte); 738 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); 739 return pte; 740 } 741 742 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 743 { 744 return pte_pmd(pte_modify(pmd_pte(pmd), newprot)); 745 } 746 747 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 748 extern int ptep_set_access_flags(struct vm_area_struct *vma, 749 unsigned long address, pte_t *ptep, 750 pte_t entry, int dirty); 751 752 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 753 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS 754 static inline int pmdp_set_access_flags(struct vm_area_struct *vma, 755 unsigned long address, pmd_t *pmdp, 756 pmd_t entry, int dirty) 757 { 758 return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty); 759 } 760 761 static inline int pud_devmap(pud_t pud) 762 { 763 return 0; 764 } 765 766 static inline int pgd_devmap(pgd_t pgd) 767 { 768 return 0; 769 } 770 #endif 771 772 /* 773 * Atomic pte/pmd modifications. 774 */ 775 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 776 static inline int __ptep_test_and_clear_young(pte_t *ptep) 777 { 778 pte_t old_pte, pte; 779 780 pte = READ_ONCE(*ptep); 781 do { 782 old_pte = pte; 783 pte = pte_mkold(pte); 784 pte_val(pte) = cmpxchg_relaxed(&pte_val(*ptep), 785 pte_val(old_pte), pte_val(pte)); 786 } while (pte_val(pte) != pte_val(old_pte)); 787 788 return pte_young(pte); 789 } 790 791 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, 792 unsigned long address, 793 pte_t *ptep) 794 { 795 return __ptep_test_and_clear_young(ptep); 796 } 797 798 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 799 static inline int ptep_clear_flush_young(struct vm_area_struct *vma, 800 unsigned long address, pte_t *ptep) 801 { 802 int young = ptep_test_and_clear_young(vma, address, ptep); 803 804 if (young) { 805 /* 806 * We can elide the trailing DSB here since the worst that can 807 * happen is that a CPU continues to use the young entry in its 808 * TLB and we mistakenly reclaim the associated page. The 809 * window for such an event is bounded by the next 810 * context-switch, which provides a DSB to complete the TLB 811 * invalidation. 812 */ 813 flush_tlb_page_nosync(vma, address); 814 } 815 816 return young; 817 } 818 819 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 820 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 821 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, 822 unsigned long address, 823 pmd_t *pmdp) 824 { 825 return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp); 826 } 827 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 828 829 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 830 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, 831 unsigned long address, pte_t *ptep) 832 { 833 return __pte(xchg_relaxed(&pte_val(*ptep), 0)); 834 } 835 836 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 837 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 838 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 839 unsigned long address, pmd_t *pmdp) 840 { 841 return pte_pmd(ptep_get_and_clear(mm, address, (pte_t *)pmdp)); 842 } 843 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 844 845 /* 846 * ptep_set_wrprotect - mark read-only while trasferring potential hardware 847 * dirty status (PTE_DBM && !PTE_RDONLY) to the software PTE_DIRTY bit. 848 */ 849 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 850 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) 851 { 852 pte_t old_pte, pte; 853 854 pte = READ_ONCE(*ptep); 855 do { 856 old_pte = pte; 857 pte = pte_wrprotect(pte); 858 pte_val(pte) = cmpxchg_relaxed(&pte_val(*ptep), 859 pte_val(old_pte), pte_val(pte)); 860 } while (pte_val(pte) != pte_val(old_pte)); 861 } 862 863 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 864 #define __HAVE_ARCH_PMDP_SET_WRPROTECT 865 static inline void pmdp_set_wrprotect(struct mm_struct *mm, 866 unsigned long address, pmd_t *pmdp) 867 { 868 ptep_set_wrprotect(mm, address, (pte_t *)pmdp); 869 } 870 871 #define pmdp_establish pmdp_establish 872 static inline pmd_t pmdp_establish(struct vm_area_struct *vma, 873 unsigned long address, pmd_t *pmdp, pmd_t pmd) 874 { 875 return __pmd(xchg_relaxed(&pmd_val(*pmdp), pmd_val(pmd))); 876 } 877 #endif 878 879 /* 880 * Encode and decode a swap entry: 881 * bits 0-1: present (must be zero) 882 * bits 2-7: swap type 883 * bits 8-57: swap offset 884 * bit 58: PTE_PROT_NONE (must be zero) 885 */ 886 #define __SWP_TYPE_SHIFT 2 887 #define __SWP_TYPE_BITS 6 888 #define __SWP_OFFSET_BITS 50 889 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) 890 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) 891 #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) 892 893 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) 894 #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) 895 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) 896 897 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 898 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) 899 900 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION 901 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) 902 #define __swp_entry_to_pmd(swp) __pmd((swp).val) 903 #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ 904 905 /* 906 * Ensure that there are not more swap files than can be encoded in the kernel 907 * PTEs. 908 */ 909 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) 910 911 extern int kern_addr_valid(unsigned long addr); 912 913 #ifdef CONFIG_ARM64_MTE 914 915 #define __HAVE_ARCH_PREPARE_TO_SWAP 916 static inline int arch_prepare_to_swap(struct page *page) 917 { 918 if (system_supports_mte()) 919 return mte_save_tags(page); 920 return 0; 921 } 922 923 #define __HAVE_ARCH_SWAP_INVALIDATE 924 static inline void arch_swap_invalidate_page(int type, pgoff_t offset) 925 { 926 if (system_supports_mte()) 927 mte_invalidate_tags(type, offset); 928 } 929 930 static inline void arch_swap_invalidate_area(int type) 931 { 932 if (system_supports_mte()) 933 mte_invalidate_tags_area(type); 934 } 935 936 #define __HAVE_ARCH_SWAP_RESTORE 937 static inline void arch_swap_restore(swp_entry_t entry, struct page *page) 938 { 939 if (system_supports_mte() && mte_restore_tags(entry, page)) 940 set_bit(PG_mte_tagged, &page->flags); 941 } 942 943 #endif /* CONFIG_ARM64_MTE */ 944 945 /* 946 * On AArch64, the cache coherency is handled via the set_pte_at() function. 947 */ 948 static inline void update_mmu_cache(struct vm_area_struct *vma, 949 unsigned long addr, pte_t *ptep) 950 { 951 /* 952 * We don't do anything here, so there's a very small chance of 953 * us retaking a user fault which we just fixed up. The alternative 954 * is doing a dsb(ishst), but that penalises the fastpath. 955 */ 956 } 957 958 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) 959 960 #ifdef CONFIG_ARM64_PA_BITS_52 961 #define phys_to_ttbr(addr) (((addr) | ((addr) >> 46)) & TTBR_BADDR_MASK_52) 962 #else 963 #define phys_to_ttbr(addr) (addr) 964 #endif 965 966 /* 967 * On arm64 without hardware Access Flag, copying from user will fail because 968 * the pte is old and cannot be marked young. So we always end up with zeroed 969 * page after fork() + CoW for pfn mappings. We don't always have a 970 * hardware-managed access flag on arm64. 971 */ 972 static inline bool arch_faults_on_old_pte(void) 973 { 974 WARN_ON(preemptible()); 975 976 return !cpu_has_hw_af(); 977 } 978 #define arch_faults_on_old_pte arch_faults_on_old_pte 979 980 #endif /* !__ASSEMBLY__ */ 981 982 #endif /* __ASM_PGTABLE_H */ 983