1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 * Copyright (C) 2019 Western Digital Corporation or its affiliates. 5 * Copyright (C) 2020 FORTH-ICS/CARV 6 * Nick Kossifidis <mick@ics.forth.gr> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/mm.h> 11 #include <linux/memblock.h> 12 #include <linux/initrd.h> 13 #include <linux/swap.h> 14 #include <linux/swiotlb.h> 15 #include <linux/sizes.h> 16 #include <linux/of_fdt.h> 17 #include <linux/of_reserved_mem.h> 18 #include <linux/libfdt.h> 19 #include <linux/set_memory.h> 20 #include <linux/dma-map-ops.h> 21 #include <linux/crash_dump.h> 22 #include <linux/hugetlb.h> 23 #ifdef CONFIG_RELOCATABLE 24 #include <linux/elf.h> 25 #endif 26 #include <linux/kfence.h> 27 #include <linux/execmem.h> 28 29 #include <asm/fixmap.h> 30 #include <asm/io.h> 31 #include <asm/kasan.h> 32 #include <asm/numa.h> 33 #include <asm/pgtable.h> 34 #include <asm/sections.h> 35 #include <asm/soc.h> 36 #include <asm/tlbflush.h> 37 38 #include "../kernel/head.h" 39 40 u64 new_vmalloc[NR_CPUS / sizeof(u64) + 1]; 41 42 struct kernel_mapping kernel_map __ro_after_init; 43 EXPORT_SYMBOL(kernel_map); 44 #ifdef CONFIG_XIP_KERNEL 45 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map)) 46 #endif 47 48 #ifdef CONFIG_64BIT 49 u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39; 50 #else 51 u64 satp_mode __ro_after_init = SATP_MODE_32; 52 #endif 53 EXPORT_SYMBOL(satp_mode); 54 55 #ifdef CONFIG_64BIT 56 bool pgtable_l4_enabled __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL); 57 bool pgtable_l5_enabled __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL); 58 EXPORT_SYMBOL(pgtable_l4_enabled); 59 EXPORT_SYMBOL(pgtable_l5_enabled); 60 #endif 61 62 phys_addr_t phys_ram_base __ro_after_init; 63 EXPORT_SYMBOL(phys_ram_base); 64 65 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 66 __page_aligned_bss; 67 EXPORT_SYMBOL(empty_zero_page); 68 69 extern char _start[]; 70 void *_dtb_early_va __initdata; 71 uintptr_t _dtb_early_pa __initdata; 72 73 phys_addr_t dma32_phys_limit __initdata; 74 75 static void __init zone_sizes_init(void) 76 { 77 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 78 79 #ifdef CONFIG_ZONE_DMA32 80 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 81 #endif 82 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 83 84 free_area_init(max_zone_pfns); 85 } 86 87 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 88 89 #define LOG2_SZ_1K ilog2(SZ_1K) 90 #define LOG2_SZ_1M ilog2(SZ_1M) 91 #define LOG2_SZ_1G ilog2(SZ_1G) 92 #define LOG2_SZ_1T ilog2(SZ_1T) 93 94 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 95 { 96 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 97 (((t) - (b)) >> LOG2_SZ_1K)); 98 } 99 100 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 101 { 102 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 103 (((t) - (b)) >> LOG2_SZ_1M)); 104 } 105 106 static inline void print_mlg(char *name, unsigned long b, unsigned long t) 107 { 108 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t, 109 (((t) - (b)) >> LOG2_SZ_1G)); 110 } 111 112 #ifdef CONFIG_64BIT 113 static inline void print_mlt(char *name, unsigned long b, unsigned long t) 114 { 115 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t, 116 (((t) - (b)) >> LOG2_SZ_1T)); 117 } 118 #else 119 #define print_mlt(n, b, t) do {} while (0) 120 #endif 121 122 static inline void print_ml(char *name, unsigned long b, unsigned long t) 123 { 124 unsigned long diff = t - b; 125 126 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10) 127 print_mlt(name, b, t); 128 else if ((diff >> LOG2_SZ_1G) >= 10) 129 print_mlg(name, b, t); 130 else if ((diff >> LOG2_SZ_1M) >= 10) 131 print_mlm(name, b, t); 132 else 133 print_mlk(name, b, t); 134 } 135 136 static void __init print_vm_layout(void) 137 { 138 pr_notice("Virtual kernel memory layout:\n"); 139 print_ml("fixmap", (unsigned long)FIXADDR_START, 140 (unsigned long)FIXADDR_TOP); 141 print_ml("pci io", (unsigned long)PCI_IO_START, 142 (unsigned long)PCI_IO_END); 143 print_ml("vmemmap", (unsigned long)VMEMMAP_START, 144 (unsigned long)VMEMMAP_END); 145 print_ml("vmalloc", (unsigned long)VMALLOC_START, 146 (unsigned long)VMALLOC_END); 147 #ifdef CONFIG_64BIT 148 print_ml("modules", (unsigned long)MODULES_VADDR, 149 (unsigned long)MODULES_END); 150 #endif 151 print_ml("lowmem", (unsigned long)PAGE_OFFSET, 152 (unsigned long)high_memory); 153 if (IS_ENABLED(CONFIG_64BIT)) { 154 #ifdef CONFIG_KASAN 155 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END); 156 #endif 157 158 print_ml("kernel", (unsigned long)kernel_map.virt_addr, 159 (unsigned long)ADDRESS_SPACE_END); 160 } 161 } 162 #else 163 static void print_vm_layout(void) { } 164 #endif /* CONFIG_DEBUG_VM */ 165 166 void __init mem_init(void) 167 { 168 bool swiotlb = max_pfn > PFN_DOWN(dma32_phys_limit); 169 #ifdef CONFIG_FLATMEM 170 BUG_ON(!mem_map); 171 #endif /* CONFIG_FLATMEM */ 172 173 if (IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) && !swiotlb && 174 dma_cache_alignment != 1) { 175 /* 176 * If no bouncing needed for ZONE_DMA, allocate 1MB swiotlb 177 * buffer per 1GB of RAM for kmalloc() bouncing on 178 * non-coherent platforms. 179 */ 180 unsigned long size = 181 DIV_ROUND_UP(memblock_phys_mem_size(), 1024); 182 swiotlb_adjust_size(min(swiotlb_size_or_default(), size)); 183 swiotlb = true; 184 } 185 186 swiotlb_init(swiotlb, SWIOTLB_VERBOSE); 187 memblock_free_all(); 188 189 print_vm_layout(); 190 } 191 192 /* Limit the memory size via mem. */ 193 static phys_addr_t memory_limit; 194 #ifdef CONFIG_XIP_KERNEL 195 #define memory_limit (*(phys_addr_t *)XIP_FIXUP(&memory_limit)) 196 #endif /* CONFIG_XIP_KERNEL */ 197 198 static int __init early_mem(char *p) 199 { 200 u64 size; 201 202 if (!p) 203 return 1; 204 205 size = memparse(p, &p) & PAGE_MASK; 206 memory_limit = min_t(u64, size, memory_limit); 207 208 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); 209 210 return 0; 211 } 212 early_param("mem", early_mem); 213 214 static void __init setup_bootmem(void) 215 { 216 phys_addr_t vmlinux_end = __pa_symbol(&_end); 217 phys_addr_t max_mapped_addr; 218 phys_addr_t phys_ram_end, vmlinux_start; 219 220 if (IS_ENABLED(CONFIG_XIP_KERNEL)) 221 vmlinux_start = __pa_symbol(&_sdata); 222 else 223 vmlinux_start = __pa_symbol(&_start); 224 225 memblock_enforce_memory_limit(memory_limit); 226 227 /* 228 * Make sure we align the reservation on PMD_SIZE since we will 229 * map the kernel in the linear mapping as read-only: we do not want 230 * any allocation to happen between _end and the next pmd aligned page. 231 */ 232 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) 233 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK; 234 /* 235 * Reserve from the start of the kernel to the end of the kernel 236 */ 237 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 238 239 /* 240 * Make sure we align the start of the memory on a PMD boundary so that 241 * at worst, we map the linear mapping with PMD mappings. 242 */ 243 if (!IS_ENABLED(CONFIG_XIP_KERNEL)) 244 phys_ram_base = memblock_start_of_DRAM() & PMD_MASK; 245 246 /* 247 * In 64-bit, any use of __va/__pa before this point is wrong as we 248 * did not know the start of DRAM before. 249 */ 250 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) 251 kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base; 252 253 /* 254 * The size of the linear page mapping may restrict the amount of 255 * usable RAM. 256 */ 257 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) { 258 max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE; 259 memblock_cap_memory_range(phys_ram_base, 260 max_mapped_addr - phys_ram_base); 261 } 262 263 /* 264 * Reserve physical address space that would be mapped to virtual 265 * addresses greater than (void *)(-PAGE_SIZE) because: 266 * - This memory would overlap with ERR_PTR 267 * - This memory belongs to high memory, which is not supported 268 * 269 * This is not applicable to 64-bit kernel, because virtual addresses 270 * after (void *)(-PAGE_SIZE) are not linearly mapped: they are 271 * occupied by kernel mapping. Also it is unrealistic for high memory 272 * to exist on 64-bit platforms. 273 */ 274 if (!IS_ENABLED(CONFIG_64BIT)) { 275 max_mapped_addr = __va_to_pa_nodebug(-PAGE_SIZE); 276 memblock_reserve(max_mapped_addr, (phys_addr_t)-max_mapped_addr); 277 } 278 279 phys_ram_end = memblock_end_of_DRAM(); 280 min_low_pfn = PFN_UP(phys_ram_base); 281 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end); 282 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 283 284 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 285 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); 286 287 reserve_initrd_mem(); 288 289 /* 290 * No allocation should be done before reserving the memory as defined 291 * in the device tree, otherwise the allocation could end up in a 292 * reserved region. 293 */ 294 early_init_fdt_scan_reserved_mem(); 295 296 /* 297 * If DTB is built in, no need to reserve its memblock. 298 * Otherwise, do reserve it but avoid using 299 * early_init_fdt_reserve_self() since __pa() does 300 * not work for DTB pointers that are fixmap addresses 301 */ 302 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) 303 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 304 305 dma_contiguous_reserve(dma32_phys_limit); 306 if (IS_ENABLED(CONFIG_64BIT)) 307 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 308 } 309 310 #ifdef CONFIG_MMU 311 struct pt_alloc_ops pt_ops __meminitdata; 312 313 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 314 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 315 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 316 317 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 318 319 #ifdef CONFIG_XIP_KERNEL 320 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops)) 321 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir)) 322 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte)) 323 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir)) 324 #endif /* CONFIG_XIP_KERNEL */ 325 326 static const pgprot_t protection_map[16] = { 327 [VM_NONE] = PAGE_NONE, 328 [VM_READ] = PAGE_READ, 329 [VM_WRITE] = PAGE_COPY, 330 [VM_WRITE | VM_READ] = PAGE_COPY, 331 [VM_EXEC] = PAGE_EXEC, 332 [VM_EXEC | VM_READ] = PAGE_READ_EXEC, 333 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC, 334 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC, 335 [VM_SHARED] = PAGE_NONE, 336 [VM_SHARED | VM_READ] = PAGE_READ, 337 [VM_SHARED | VM_WRITE] = PAGE_SHARED, 338 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, 339 [VM_SHARED | VM_EXEC] = PAGE_EXEC, 340 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC, 341 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, 342 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC 343 }; 344 DECLARE_VM_GET_PAGE_PROT 345 346 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 347 { 348 unsigned long addr = __fix_to_virt(idx); 349 pte_t *ptep; 350 351 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 352 353 ptep = &fixmap_pte[pte_index(addr)]; 354 355 if (pgprot_val(prot)) 356 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 357 else 358 pte_clear(&init_mm, addr, ptep); 359 local_flush_tlb_page(addr); 360 } 361 362 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 363 { 364 return (pte_t *)((uintptr_t)pa); 365 } 366 367 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 368 { 369 clear_fixmap(FIX_PTE); 370 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 371 } 372 373 static inline pte_t *__meminit get_pte_virt_late(phys_addr_t pa) 374 { 375 return (pte_t *) __va(pa); 376 } 377 378 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 379 { 380 /* 381 * We only create PMD or PGD early mappings so we 382 * should never reach here with MMU disabled. 383 */ 384 BUG(); 385 } 386 387 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 388 { 389 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 390 } 391 392 static phys_addr_t __meminit alloc_pte_late(uintptr_t va) 393 { 394 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0); 395 396 BUG_ON(!ptdesc || !pagetable_pte_ctor(ptdesc)); 397 return __pa((pte_t *)ptdesc_address(ptdesc)); 398 } 399 400 static void __meminit create_pte_mapping(pte_t *ptep, uintptr_t va, phys_addr_t pa, phys_addr_t sz, 401 pgprot_t prot) 402 { 403 uintptr_t pte_idx = pte_index(va); 404 405 BUG_ON(sz != PAGE_SIZE); 406 407 if (pte_none(ptep[pte_idx])) 408 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 409 } 410 411 #ifndef __PAGETABLE_PMD_FOLDED 412 413 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 414 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 415 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 416 417 #ifdef CONFIG_XIP_KERNEL 418 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd)) 419 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd)) 420 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd)) 421 #endif /* CONFIG_XIP_KERNEL */ 422 423 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss; 424 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss; 425 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 426 427 #ifdef CONFIG_XIP_KERNEL 428 #define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d)) 429 #define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d)) 430 #define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d)) 431 #endif /* CONFIG_XIP_KERNEL */ 432 433 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss; 434 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss; 435 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 436 437 #ifdef CONFIG_XIP_KERNEL 438 #define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud)) 439 #define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud)) 440 #define early_pud ((pud_t *)XIP_FIXUP(early_pud)) 441 #endif /* CONFIG_XIP_KERNEL */ 442 443 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 444 { 445 /* Before MMU is enabled */ 446 return (pmd_t *)((uintptr_t)pa); 447 } 448 449 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 450 { 451 clear_fixmap(FIX_PMD); 452 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 453 } 454 455 static pmd_t *__meminit get_pmd_virt_late(phys_addr_t pa) 456 { 457 return (pmd_t *) __va(pa); 458 } 459 460 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 461 { 462 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT); 463 464 return (uintptr_t)early_pmd; 465 } 466 467 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 468 { 469 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 470 } 471 472 static phys_addr_t __meminit alloc_pmd_late(uintptr_t va) 473 { 474 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0); 475 476 BUG_ON(!ptdesc || !pagetable_pmd_ctor(ptdesc)); 477 return __pa((pmd_t *)ptdesc_address(ptdesc)); 478 } 479 480 static void __meminit create_pmd_mapping(pmd_t *pmdp, 481 uintptr_t va, phys_addr_t pa, 482 phys_addr_t sz, pgprot_t prot) 483 { 484 pte_t *ptep; 485 phys_addr_t pte_phys; 486 uintptr_t pmd_idx = pmd_index(va); 487 488 if (sz == PMD_SIZE) { 489 if (pmd_none(pmdp[pmd_idx])) 490 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 491 return; 492 } 493 494 if (pmd_none(pmdp[pmd_idx])) { 495 pte_phys = pt_ops.alloc_pte(va); 496 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 497 ptep = pt_ops.get_pte_virt(pte_phys); 498 memset(ptep, 0, PAGE_SIZE); 499 } else { 500 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 501 ptep = pt_ops.get_pte_virt(pte_phys); 502 } 503 504 create_pte_mapping(ptep, va, pa, sz, prot); 505 } 506 507 static pud_t *__init get_pud_virt_early(phys_addr_t pa) 508 { 509 return (pud_t *)((uintptr_t)pa); 510 } 511 512 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa) 513 { 514 clear_fixmap(FIX_PUD); 515 return (pud_t *)set_fixmap_offset(FIX_PUD, pa); 516 } 517 518 static pud_t *__meminit get_pud_virt_late(phys_addr_t pa) 519 { 520 return (pud_t *)__va(pa); 521 } 522 523 static phys_addr_t __init alloc_pud_early(uintptr_t va) 524 { 525 /* Only one PUD is available for early mapping */ 526 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 527 528 return (uintptr_t)early_pud; 529 } 530 531 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va) 532 { 533 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 534 } 535 536 static phys_addr_t __meminit alloc_pud_late(uintptr_t va) 537 { 538 unsigned long vaddr; 539 540 vaddr = __get_free_page(GFP_KERNEL); 541 BUG_ON(!vaddr); 542 return __pa(vaddr); 543 } 544 545 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa) 546 { 547 return (p4d_t *)((uintptr_t)pa); 548 } 549 550 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa) 551 { 552 clear_fixmap(FIX_P4D); 553 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa); 554 } 555 556 static p4d_t *__meminit get_p4d_virt_late(phys_addr_t pa) 557 { 558 return (p4d_t *)__va(pa); 559 } 560 561 static phys_addr_t __init alloc_p4d_early(uintptr_t va) 562 { 563 /* Only one P4D is available for early mapping */ 564 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 565 566 return (uintptr_t)early_p4d; 567 } 568 569 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va) 570 { 571 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 572 } 573 574 static phys_addr_t __meminit alloc_p4d_late(uintptr_t va) 575 { 576 unsigned long vaddr; 577 578 vaddr = __get_free_page(GFP_KERNEL); 579 BUG_ON(!vaddr); 580 return __pa(vaddr); 581 } 582 583 static void __meminit create_pud_mapping(pud_t *pudp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, 584 pgprot_t prot) 585 { 586 pmd_t *nextp; 587 phys_addr_t next_phys; 588 uintptr_t pud_index = pud_index(va); 589 590 if (sz == PUD_SIZE) { 591 if (pud_val(pudp[pud_index]) == 0) 592 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot); 593 return; 594 } 595 596 if (pud_val(pudp[pud_index]) == 0) { 597 next_phys = pt_ops.alloc_pmd(va); 598 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE); 599 nextp = pt_ops.get_pmd_virt(next_phys); 600 memset(nextp, 0, PAGE_SIZE); 601 } else { 602 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index])); 603 nextp = pt_ops.get_pmd_virt(next_phys); 604 } 605 606 create_pmd_mapping(nextp, va, pa, sz, prot); 607 } 608 609 static void __meminit create_p4d_mapping(p4d_t *p4dp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, 610 pgprot_t prot) 611 { 612 pud_t *nextp; 613 phys_addr_t next_phys; 614 uintptr_t p4d_index = p4d_index(va); 615 616 if (sz == P4D_SIZE) { 617 if (p4d_val(p4dp[p4d_index]) == 0) 618 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot); 619 return; 620 } 621 622 if (p4d_val(p4dp[p4d_index]) == 0) { 623 next_phys = pt_ops.alloc_pud(va); 624 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE); 625 nextp = pt_ops.get_pud_virt(next_phys); 626 memset(nextp, 0, PAGE_SIZE); 627 } else { 628 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index])); 629 nextp = pt_ops.get_pud_virt(next_phys); 630 } 631 632 create_pud_mapping(nextp, va, pa, sz, prot); 633 } 634 635 #define pgd_next_t p4d_t 636 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \ 637 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \ 638 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va))) 639 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \ 640 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \ 641 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa))) 642 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 643 (pgtable_l5_enabled ? \ 644 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \ 645 (pgtable_l4_enabled ? \ 646 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \ 647 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot))) 648 #define fixmap_pgd_next (pgtable_l5_enabled ? \ 649 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \ 650 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd)) 651 #define trampoline_pgd_next (pgtable_l5_enabled ? \ 652 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \ 653 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd)) 654 #else 655 #define pgd_next_t pte_t 656 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 657 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 658 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 659 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 660 #define fixmap_pgd_next ((uintptr_t)fixmap_pte) 661 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 662 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 663 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 664 #endif /* __PAGETABLE_PMD_FOLDED */ 665 666 void __meminit create_pgd_mapping(pgd_t *pgdp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, 667 pgprot_t prot) 668 { 669 pgd_next_t *nextp; 670 phys_addr_t next_phys; 671 uintptr_t pgd_idx = pgd_index(va); 672 673 if (sz == PGDIR_SIZE) { 674 if (pgd_val(pgdp[pgd_idx]) == 0) 675 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 676 return; 677 } 678 679 if (pgd_val(pgdp[pgd_idx]) == 0) { 680 next_phys = alloc_pgd_next(va); 681 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 682 nextp = get_pgd_next_virt(next_phys); 683 memset(nextp, 0, PAGE_SIZE); 684 } else { 685 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 686 nextp = get_pgd_next_virt(next_phys); 687 } 688 689 create_pgd_next_mapping(nextp, va, pa, sz, prot); 690 } 691 692 static uintptr_t __meminit best_map_size(phys_addr_t pa, uintptr_t va, phys_addr_t size) 693 { 694 if (debug_pagealloc_enabled()) 695 return PAGE_SIZE; 696 697 if (pgtable_l5_enabled && 698 !(pa & (P4D_SIZE - 1)) && !(va & (P4D_SIZE - 1)) && size >= P4D_SIZE) 699 return P4D_SIZE; 700 701 if (pgtable_l4_enabled && 702 !(pa & (PUD_SIZE - 1)) && !(va & (PUD_SIZE - 1)) && size >= PUD_SIZE) 703 return PUD_SIZE; 704 705 if (IS_ENABLED(CONFIG_64BIT) && 706 !(pa & (PMD_SIZE - 1)) && !(va & (PMD_SIZE - 1)) && size >= PMD_SIZE) 707 return PMD_SIZE; 708 709 return PAGE_SIZE; 710 } 711 712 #ifdef CONFIG_XIP_KERNEL 713 #define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base)) 714 extern char _xiprom[], _exiprom[], __data_loc; 715 716 /* called from head.S with MMU off */ 717 asmlinkage void __init __copy_data(void) 718 { 719 void *from = (void *)(&__data_loc); 720 void *to = (void *)CONFIG_PHYS_RAM_BASE; 721 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata)); 722 723 memcpy(to, from, sz); 724 } 725 #endif 726 727 #ifdef CONFIG_STRICT_KERNEL_RWX 728 static __meminit pgprot_t pgprot_from_va(uintptr_t va) 729 { 730 if (is_va_kernel_text(va)) 731 return PAGE_KERNEL_READ_EXEC; 732 733 /* 734 * In 64-bit kernel, the kernel mapping is outside the linear mapping so 735 * we must protect its linear mapping alias from being executed and 736 * written. 737 * And rodata section is marked readonly in mark_rodata_ro. 738 */ 739 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) 740 return PAGE_KERNEL_READ; 741 742 return PAGE_KERNEL; 743 } 744 745 void mark_rodata_ro(void) 746 { 747 set_kernel_memory(__start_rodata, _data, set_memory_ro); 748 if (IS_ENABLED(CONFIG_64BIT)) 749 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), 750 set_memory_ro); 751 } 752 #else 753 static __meminit pgprot_t pgprot_from_va(uintptr_t va) 754 { 755 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) 756 return PAGE_KERNEL; 757 758 return PAGE_KERNEL_EXEC; 759 } 760 #endif /* CONFIG_STRICT_KERNEL_RWX */ 761 762 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 763 u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa); 764 765 static void __init disable_pgtable_l5(void) 766 { 767 pgtable_l5_enabled = false; 768 kernel_map.page_offset = PAGE_OFFSET_L4; 769 satp_mode = SATP_MODE_48; 770 } 771 772 static void __init disable_pgtable_l4(void) 773 { 774 pgtable_l4_enabled = false; 775 kernel_map.page_offset = PAGE_OFFSET_L3; 776 satp_mode = SATP_MODE_39; 777 } 778 779 static int __init print_no4lvl(char *p) 780 { 781 pr_info("Disabled 4-level and 5-level paging"); 782 return 0; 783 } 784 early_param("no4lvl", print_no4lvl); 785 786 static int __init print_no5lvl(char *p) 787 { 788 pr_info("Disabled 5-level paging"); 789 return 0; 790 } 791 early_param("no5lvl", print_no5lvl); 792 793 static void __init set_mmap_rnd_bits_max(void) 794 { 795 mmap_rnd_bits_max = MMAP_VA_BITS - PAGE_SHIFT - 3; 796 } 797 798 /* 799 * There is a simple way to determine if 4-level is supported by the 800 * underlying hardware: establish 1:1 mapping in 4-level page table mode 801 * then read SATP to see if the configuration was taken into account 802 * meaning sv48 is supported. 803 */ 804 static __init void set_satp_mode(uintptr_t dtb_pa) 805 { 806 u64 identity_satp, hw_satp; 807 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; 808 u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa); 809 810 if (satp_mode_cmdline == SATP_MODE_57) { 811 disable_pgtable_l5(); 812 } else if (satp_mode_cmdline == SATP_MODE_48) { 813 disable_pgtable_l5(); 814 disable_pgtable_l4(); 815 return; 816 } 817 818 create_p4d_mapping(early_p4d, 819 set_satp_mode_pmd, (uintptr_t)early_pud, 820 P4D_SIZE, PAGE_TABLE); 821 create_pud_mapping(early_pud, 822 set_satp_mode_pmd, (uintptr_t)early_pmd, 823 PUD_SIZE, PAGE_TABLE); 824 /* Handle the case where set_satp_mode straddles 2 PMDs */ 825 create_pmd_mapping(early_pmd, 826 set_satp_mode_pmd, set_satp_mode_pmd, 827 PMD_SIZE, PAGE_KERNEL_EXEC); 828 create_pmd_mapping(early_pmd, 829 set_satp_mode_pmd + PMD_SIZE, 830 set_satp_mode_pmd + PMD_SIZE, 831 PMD_SIZE, PAGE_KERNEL_EXEC); 832 retry: 833 create_pgd_mapping(early_pg_dir, 834 set_satp_mode_pmd, 835 pgtable_l5_enabled ? 836 (uintptr_t)early_p4d : (uintptr_t)early_pud, 837 PGDIR_SIZE, PAGE_TABLE); 838 839 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode; 840 841 local_flush_tlb_all(); 842 csr_write(CSR_SATP, identity_satp); 843 hw_satp = csr_swap(CSR_SATP, 0ULL); 844 local_flush_tlb_all(); 845 846 if (hw_satp != identity_satp) { 847 if (pgtable_l5_enabled) { 848 disable_pgtable_l5(); 849 memset(early_pg_dir, 0, PAGE_SIZE); 850 goto retry; 851 } 852 disable_pgtable_l4(); 853 } 854 855 memset(early_pg_dir, 0, PAGE_SIZE); 856 memset(early_p4d, 0, PAGE_SIZE); 857 memset(early_pud, 0, PAGE_SIZE); 858 memset(early_pmd, 0, PAGE_SIZE); 859 } 860 #endif 861 862 /* 863 * setup_vm() is called from head.S with MMU-off. 864 * 865 * Following requirements should be honoured for setup_vm() to work 866 * correctly: 867 * 1) It should use PC-relative addressing for accessing kernel symbols. 868 * To achieve this we always use GCC cmodel=medany. 869 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 870 * so disable compiler instrumentation when FTRACE is enabled. 871 * 872 * Currently, the above requirements are honoured by using custom CFLAGS 873 * for init.o in mm/Makefile. 874 */ 875 876 #ifndef __riscv_cmodel_medany 877 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 878 #endif 879 880 #ifdef CONFIG_RELOCATABLE 881 extern unsigned long __rela_dyn_start, __rela_dyn_end; 882 883 static void __init relocate_kernel(void) 884 { 885 Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start; 886 /* 887 * This holds the offset between the linked virtual address and the 888 * relocated virtual address. 889 */ 890 uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR; 891 /* 892 * This holds the offset between kernel linked virtual address and 893 * physical address. 894 */ 895 uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr; 896 897 for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) { 898 Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset); 899 Elf64_Addr relocated_addr = rela->r_addend; 900 901 if (rela->r_info != R_RISCV_RELATIVE) 902 continue; 903 904 /* 905 * Make sure to not relocate vdso symbols like rt_sigreturn 906 * which are linked from the address 0 in vmlinux since 907 * vdso symbol addresses are actually used as an offset from 908 * mm->context.vdso in VDSO_OFFSET macro. 909 */ 910 if (relocated_addr >= KERNEL_LINK_ADDR) 911 relocated_addr += reloc_offset; 912 913 *(Elf64_Addr *)addr = relocated_addr; 914 } 915 } 916 #endif /* CONFIG_RELOCATABLE */ 917 918 #ifdef CONFIG_XIP_KERNEL 919 static void __init create_kernel_page_table(pgd_t *pgdir, 920 __always_unused bool early) 921 { 922 uintptr_t va, start_va, end_va; 923 924 /* Map the flash resident part */ 925 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz; 926 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 927 create_pgd_mapping(pgdir, va, 928 kernel_map.xiprom + (va - kernel_map.virt_addr), 929 PMD_SIZE, PAGE_KERNEL_EXEC); 930 931 /* Map the data in RAM */ 932 start_va = kernel_map.virt_addr + (uintptr_t)&_sdata - (uintptr_t)&_start; 933 end_va = kernel_map.virt_addr + kernel_map.size; 934 for (va = start_va; va < end_va; va += PMD_SIZE) 935 create_pgd_mapping(pgdir, va, 936 kernel_map.phys_addr + (va - start_va), 937 PMD_SIZE, PAGE_KERNEL); 938 } 939 #else 940 static void __init create_kernel_page_table(pgd_t *pgdir, bool early) 941 { 942 uintptr_t va, end_va; 943 944 end_va = kernel_map.virt_addr + kernel_map.size; 945 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 946 create_pgd_mapping(pgdir, va, 947 kernel_map.phys_addr + (va - kernel_map.virt_addr), 948 PMD_SIZE, 949 early ? 950 PAGE_KERNEL_EXEC : pgprot_from_va(va)); 951 } 952 #endif 953 954 /* 955 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel, 956 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR 957 * entry. 958 */ 959 static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va, 960 uintptr_t dtb_pa) 961 { 962 #ifndef CONFIG_BUILTIN_DTB 963 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1); 964 965 /* Make sure the fdt fixmap address is always aligned on PMD size */ 966 BUILD_BUG_ON(FIX_FDT % (PMD_SIZE / PAGE_SIZE)); 967 968 /* In 32-bit only, the fdt lies in its own PGD */ 969 if (!IS_ENABLED(CONFIG_64BIT)) { 970 create_pgd_mapping(early_pg_dir, fix_fdt_va, 971 pa, MAX_FDT_SIZE, PAGE_KERNEL); 972 } else { 973 create_pmd_mapping(fixmap_pmd, fix_fdt_va, 974 pa, PMD_SIZE, PAGE_KERNEL); 975 create_pmd_mapping(fixmap_pmd, fix_fdt_va + PMD_SIZE, 976 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 977 } 978 979 dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1)); 980 #else 981 /* 982 * For 64-bit kernel, __va can't be used since it would return a linear 983 * mapping address whereas dtb_early_va will be used before 984 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the 985 * kernel is mapped in the linear mapping, that makes no difference. 986 */ 987 dtb_early_va = kernel_mapping_pa_to_va(dtb_pa); 988 #endif 989 990 dtb_early_pa = dtb_pa; 991 } 992 993 /* 994 * MMU is not enabled, the page tables are allocated directly using 995 * early_pmd/pud/p4d and the address returned is the physical one. 996 */ 997 static void __init pt_ops_set_early(void) 998 { 999 pt_ops.alloc_pte = alloc_pte_early; 1000 pt_ops.get_pte_virt = get_pte_virt_early; 1001 #ifndef __PAGETABLE_PMD_FOLDED 1002 pt_ops.alloc_pmd = alloc_pmd_early; 1003 pt_ops.get_pmd_virt = get_pmd_virt_early; 1004 pt_ops.alloc_pud = alloc_pud_early; 1005 pt_ops.get_pud_virt = get_pud_virt_early; 1006 pt_ops.alloc_p4d = alloc_p4d_early; 1007 pt_ops.get_p4d_virt = get_p4d_virt_early; 1008 #endif 1009 } 1010 1011 /* 1012 * MMU is enabled but page table setup is not complete yet. 1013 * fixmap page table alloc functions must be used as a means to temporarily 1014 * map the allocated physical pages since the linear mapping does not exist yet. 1015 * 1016 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va, 1017 * but it will be used as described above. 1018 */ 1019 static void __init pt_ops_set_fixmap(void) 1020 { 1021 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap); 1022 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap); 1023 #ifndef __PAGETABLE_PMD_FOLDED 1024 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap); 1025 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap); 1026 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap); 1027 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap); 1028 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap); 1029 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap); 1030 #endif 1031 } 1032 1033 /* 1034 * MMU is enabled and page table setup is complete, so from now, we can use 1035 * generic page allocation functions to setup page table. 1036 */ 1037 static void __init pt_ops_set_late(void) 1038 { 1039 pt_ops.alloc_pte = alloc_pte_late; 1040 pt_ops.get_pte_virt = get_pte_virt_late; 1041 #ifndef __PAGETABLE_PMD_FOLDED 1042 pt_ops.alloc_pmd = alloc_pmd_late; 1043 pt_ops.get_pmd_virt = get_pmd_virt_late; 1044 pt_ops.alloc_pud = alloc_pud_late; 1045 pt_ops.get_pud_virt = get_pud_virt_late; 1046 pt_ops.alloc_p4d = alloc_p4d_late; 1047 pt_ops.get_p4d_virt = get_p4d_virt_late; 1048 #endif 1049 } 1050 1051 #ifdef CONFIG_RANDOMIZE_BASE 1052 extern bool __init __pi_set_nokaslr_from_cmdline(uintptr_t dtb_pa); 1053 extern u64 __init __pi_get_kaslr_seed(uintptr_t dtb_pa); 1054 extern u64 __init __pi_get_kaslr_seed_zkr(const uintptr_t dtb_pa); 1055 1056 static int __init print_nokaslr(char *p) 1057 { 1058 pr_info("Disabled KASLR"); 1059 return 0; 1060 } 1061 early_param("nokaslr", print_nokaslr); 1062 1063 unsigned long kaslr_offset(void) 1064 { 1065 return kernel_map.virt_offset; 1066 } 1067 #endif 1068 1069 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1070 { 1071 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd; 1072 1073 #ifdef CONFIG_RANDOMIZE_BASE 1074 if (!__pi_set_nokaslr_from_cmdline(dtb_pa)) { 1075 u64 kaslr_seed = __pi_get_kaslr_seed_zkr(dtb_pa); 1076 u32 kernel_size = (uintptr_t)(&_end) - (uintptr_t)(&_start); 1077 u32 nr_pos; 1078 1079 if (kaslr_seed == 0) 1080 kaslr_seed = __pi_get_kaslr_seed(dtb_pa); 1081 /* 1082 * Compute the number of positions available: we are limited 1083 * by the early page table that only has one PUD and we must 1084 * be aligned on PMD_SIZE. 1085 */ 1086 nr_pos = (PUD_SIZE - kernel_size) / PMD_SIZE; 1087 1088 kernel_map.virt_offset = (kaslr_seed % nr_pos) * PMD_SIZE; 1089 } 1090 #endif 1091 1092 kernel_map.virt_addr = KERNEL_LINK_ADDR + kernel_map.virt_offset; 1093 1094 #ifdef CONFIG_XIP_KERNEL 1095 #ifdef CONFIG_64BIT 1096 kernel_map.page_offset = PAGE_OFFSET_L3; 1097 #else 1098 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL); 1099 #endif 1100 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR; 1101 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom); 1102 1103 phys_ram_base = CONFIG_PHYS_RAM_BASE; 1104 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE; 1105 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_start); 1106 1107 kernel_map.va_kernel_xip_text_pa_offset = kernel_map.virt_addr - kernel_map.xiprom; 1108 kernel_map.va_kernel_xip_data_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr 1109 + (uintptr_t)&_sdata - (uintptr_t)&_start; 1110 #else 1111 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL); 1112 kernel_map.phys_addr = (uintptr_t)(&_start); 1113 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr; 1114 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; 1115 #endif 1116 1117 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 1118 set_satp_mode(dtb_pa); 1119 set_mmap_rnd_bits_max(); 1120 #endif 1121 1122 /* 1123 * In 64-bit, we defer the setup of va_pa_offset to setup_bootmem, 1124 * where we have the system memory layout: this allows us to align 1125 * the physical and virtual mappings and then make use of PUD/P4D/PGD 1126 * for the linear mapping. This is only possible because the kernel 1127 * mapping lies outside the linear mapping. 1128 * In 32-bit however, as the kernel resides in the linear mapping, 1129 * setup_vm_final can not change the mapping established here, 1130 * otherwise the same kernel addresses would get mapped to different 1131 * physical addresses (if the start of dram is different from the 1132 * kernel physical address start). 1133 */ 1134 kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ? 1135 0UL : PAGE_OFFSET - kernel_map.phys_addr; 1136 1137 memory_limit = KERN_VIRT_SIZE; 1138 1139 /* Sanity check alignment and size */ 1140 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 1141 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0); 1142 1143 #ifdef CONFIG_64BIT 1144 /* 1145 * The last 4K bytes of the addressable memory can not be mapped because 1146 * of IS_ERR_VALUE macro. 1147 */ 1148 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); 1149 #endif 1150 1151 #ifdef CONFIG_RELOCATABLE 1152 /* 1153 * Early page table uses only one PUD, which makes it possible 1154 * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset 1155 * makes the kernel cross over a PUD_SIZE boundary, raise a bug 1156 * since a part of the kernel would not get mapped. 1157 */ 1158 BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size); 1159 relocate_kernel(); 1160 #endif 1161 1162 apply_early_boot_alternatives(); 1163 pt_ops_set_early(); 1164 1165 /* Setup early PGD for fixmap */ 1166 create_pgd_mapping(early_pg_dir, FIXADDR_START, 1167 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1168 1169 #ifndef __PAGETABLE_PMD_FOLDED 1170 /* Setup fixmap P4D and PUD */ 1171 if (pgtable_l5_enabled) 1172 create_p4d_mapping(fixmap_p4d, FIXADDR_START, 1173 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE); 1174 /* Setup fixmap PUD and PMD */ 1175 if (pgtable_l4_enabled) 1176 create_pud_mapping(fixmap_pud, FIXADDR_START, 1177 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE); 1178 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 1179 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 1180 /* Setup trampoline PGD and PMD */ 1181 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1182 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1183 if (pgtable_l5_enabled) 1184 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr, 1185 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE); 1186 if (pgtable_l4_enabled) 1187 create_pud_mapping(trampoline_pud, kernel_map.virt_addr, 1188 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE); 1189 #ifdef CONFIG_XIP_KERNEL 1190 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1191 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC); 1192 #else 1193 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1194 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC); 1195 #endif 1196 #else 1197 /* Setup trampoline PGD */ 1198 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1199 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC); 1200 #endif 1201 1202 /* 1203 * Setup early PGD covering entire kernel which will allow 1204 * us to reach paging_init(). We map all memory banks later 1205 * in setup_vm_final() below. 1206 */ 1207 create_kernel_page_table(early_pg_dir, true); 1208 1209 /* Setup early mapping for FDT early scan */ 1210 create_fdt_early_page_table(__fix_to_virt(FIX_FDT), dtb_pa); 1211 1212 /* 1213 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 1214 * range can not span multiple pmds. 1215 */ 1216 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 1217 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 1218 1219 #ifndef __PAGETABLE_PMD_FOLDED 1220 /* 1221 * Early ioremap fixmap is already created as it lies within first 2MB 1222 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 1223 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 1224 * the user if not. 1225 */ 1226 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 1227 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 1228 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 1229 WARN_ON(1); 1230 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 1231 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 1232 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 1233 fix_to_virt(FIX_BTMAP_BEGIN)); 1234 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 1235 fix_to_virt(FIX_BTMAP_END)); 1236 1237 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 1238 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 1239 } 1240 #endif 1241 1242 pt_ops_set_fixmap(); 1243 } 1244 1245 static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end, 1246 uintptr_t fixed_map_size, const pgprot_t *pgprot) 1247 { 1248 phys_addr_t pa; 1249 uintptr_t va, map_size; 1250 1251 for (pa = start; pa < end; pa += map_size) { 1252 va = (uintptr_t)__va(pa); 1253 map_size = fixed_map_size ? fixed_map_size : 1254 best_map_size(pa, va, end - pa); 1255 1256 create_pgd_mapping(swapper_pg_dir, va, pa, map_size, 1257 pgprot ? *pgprot : pgprot_from_va(va)); 1258 } 1259 } 1260 1261 static void __init create_linear_mapping_page_table(void) 1262 { 1263 phys_addr_t start, end; 1264 phys_addr_t kfence_pool __maybe_unused; 1265 u64 i; 1266 1267 #ifdef CONFIG_STRICT_KERNEL_RWX 1268 phys_addr_t ktext_start = __pa_symbol(_start); 1269 phys_addr_t ktext_size = __init_data_begin - _start; 1270 phys_addr_t krodata_start = __pa_symbol(__start_rodata); 1271 phys_addr_t krodata_size = _data - __start_rodata; 1272 1273 /* Isolate kernel text and rodata so they don't get mapped with a PUD */ 1274 memblock_mark_nomap(ktext_start, ktext_size); 1275 memblock_mark_nomap(krodata_start, krodata_size); 1276 #endif 1277 1278 #ifdef CONFIG_KFENCE 1279 /* 1280 * kfence pool must be backed by PAGE_SIZE mappings, so allocate it 1281 * before we setup the linear mapping so that we avoid using hugepages 1282 * for this region. 1283 */ 1284 kfence_pool = memblock_phys_alloc(KFENCE_POOL_SIZE, PAGE_SIZE); 1285 BUG_ON(!kfence_pool); 1286 1287 memblock_mark_nomap(kfence_pool, KFENCE_POOL_SIZE); 1288 __kfence_pool = __va(kfence_pool); 1289 #endif 1290 1291 /* Map all memory banks in the linear mapping */ 1292 for_each_mem_range(i, &start, &end) { 1293 if (start >= end) 1294 break; 1295 if (start <= __pa(PAGE_OFFSET) && 1296 __pa(PAGE_OFFSET) < end) 1297 start = __pa(PAGE_OFFSET); 1298 1299 create_linear_mapping_range(start, end, 0, NULL); 1300 } 1301 1302 #ifdef CONFIG_STRICT_KERNEL_RWX 1303 create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0, NULL); 1304 create_linear_mapping_range(krodata_start, krodata_start + krodata_size, 0, NULL); 1305 1306 memblock_clear_nomap(ktext_start, ktext_size); 1307 memblock_clear_nomap(krodata_start, krodata_size); 1308 #endif 1309 1310 #ifdef CONFIG_KFENCE 1311 create_linear_mapping_range(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, PAGE_SIZE, NULL); 1312 1313 memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE); 1314 #endif 1315 } 1316 1317 static void __init setup_vm_final(void) 1318 { 1319 /* Setup swapper PGD for fixmap */ 1320 #if !defined(CONFIG_64BIT) 1321 /* 1322 * In 32-bit, the device tree lies in a pgd entry, so it must be copied 1323 * directly in swapper_pg_dir in addition to the pgd entry that points 1324 * to fixmap_pte. 1325 */ 1326 unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT)); 1327 1328 set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]); 1329 #endif 1330 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 1331 __pa_symbol(fixmap_pgd_next), 1332 PGDIR_SIZE, PAGE_TABLE); 1333 1334 /* Map the linear mapping */ 1335 create_linear_mapping_page_table(); 1336 1337 /* Map the kernel */ 1338 if (IS_ENABLED(CONFIG_64BIT)) 1339 create_kernel_page_table(swapper_pg_dir, false); 1340 1341 #ifdef CONFIG_KASAN 1342 kasan_swapper_init(); 1343 #endif 1344 1345 /* Clear fixmap PTE and PMD mappings */ 1346 clear_fixmap(FIX_PTE); 1347 clear_fixmap(FIX_PMD); 1348 clear_fixmap(FIX_PUD); 1349 clear_fixmap(FIX_P4D); 1350 1351 /* Move to swapper page table */ 1352 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode); 1353 local_flush_tlb_all(); 1354 1355 pt_ops_set_late(); 1356 } 1357 #else 1358 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1359 { 1360 dtb_early_va = (void *)dtb_pa; 1361 dtb_early_pa = dtb_pa; 1362 } 1363 1364 static inline void setup_vm_final(void) 1365 { 1366 } 1367 #endif /* CONFIG_MMU */ 1368 1369 /* 1370 * reserve_crashkernel() - reserves memory for crash kernel 1371 * 1372 * This function reserves memory area given in "crashkernel=" kernel command 1373 * line parameter. The memory reserved is used by dump capture kernel when 1374 * primary kernel is crashing. 1375 */ 1376 static void __init arch_reserve_crashkernel(void) 1377 { 1378 unsigned long long low_size = 0; 1379 unsigned long long crash_base, crash_size; 1380 char *cmdline = boot_command_line; 1381 bool high = false; 1382 int ret; 1383 1384 if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) 1385 return; 1386 1387 ret = parse_crashkernel(cmdline, memblock_phys_mem_size(), 1388 &crash_size, &crash_base, 1389 &low_size, &high); 1390 if (ret) 1391 return; 1392 1393 reserve_crashkernel_generic(cmdline, crash_size, crash_base, 1394 low_size, high); 1395 } 1396 1397 void __init paging_init(void) 1398 { 1399 setup_bootmem(); 1400 setup_vm_final(); 1401 1402 /* Depend on that Linear Mapping is ready */ 1403 memblock_allow_resize(); 1404 } 1405 1406 void __init misc_mem_init(void) 1407 { 1408 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 1409 arch_numa_init(); 1410 sparse_init(); 1411 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1412 /* The entire VMEMMAP region has been populated. Flush TLB for this region */ 1413 local_flush_tlb_kernel_range(VMEMMAP_START, VMEMMAP_END); 1414 #endif 1415 zone_sizes_init(); 1416 arch_reserve_crashkernel(); 1417 memblock_dump_all(); 1418 } 1419 1420 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1421 void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node, 1422 unsigned long addr, unsigned long next) 1423 { 1424 pmd_set_huge(pmd, virt_to_phys(p), PAGE_KERNEL); 1425 } 1426 1427 int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node, 1428 unsigned long addr, unsigned long next) 1429 { 1430 vmemmap_verify((pte_t *)pmdp, node, addr, next); 1431 return 1; 1432 } 1433 1434 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 1435 struct vmem_altmap *altmap) 1436 { 1437 /* 1438 * Note that SPARSEMEM_VMEMMAP is only selected for rv64 and that we 1439 * can't use hugepage mappings for 2-level page table because in case of 1440 * memory hotplug, we are not able to update all the page tables with 1441 * the new PMDs. 1442 */ 1443 return vmemmap_populate_hugepages(start, end, node, altmap); 1444 } 1445 #endif 1446 1447 #if defined(CONFIG_MMU) && defined(CONFIG_64BIT) 1448 /* 1449 * Pre-allocates page-table pages for a specific area in the kernel 1450 * page-table. Only the level which needs to be synchronized between 1451 * all page-tables is allocated because the synchronization can be 1452 * expensive. 1453 */ 1454 static void __init preallocate_pgd_pages_range(unsigned long start, unsigned long end, 1455 const char *area) 1456 { 1457 unsigned long addr; 1458 const char *lvl; 1459 1460 for (addr = start; addr < end && addr >= start; addr = ALIGN(addr + 1, PGDIR_SIZE)) { 1461 pgd_t *pgd = pgd_offset_k(addr); 1462 p4d_t *p4d; 1463 pud_t *pud; 1464 pmd_t *pmd; 1465 1466 lvl = "p4d"; 1467 p4d = p4d_alloc(&init_mm, pgd, addr); 1468 if (!p4d) 1469 goto failed; 1470 1471 if (pgtable_l5_enabled) 1472 continue; 1473 1474 lvl = "pud"; 1475 pud = pud_alloc(&init_mm, p4d, addr); 1476 if (!pud) 1477 goto failed; 1478 1479 if (pgtable_l4_enabled) 1480 continue; 1481 1482 lvl = "pmd"; 1483 pmd = pmd_alloc(&init_mm, pud, addr); 1484 if (!pmd) 1485 goto failed; 1486 } 1487 return; 1488 1489 failed: 1490 /* 1491 * The pages have to be there now or they will be missing in 1492 * process page-tables later. 1493 */ 1494 panic("Failed to pre-allocate %s pages for %s area\n", lvl, area); 1495 } 1496 1497 #define PAGE_END KASAN_SHADOW_START 1498 1499 void __init pgtable_cache_init(void) 1500 { 1501 preallocate_pgd_pages_range(VMALLOC_START, VMALLOC_END, "vmalloc"); 1502 if (IS_ENABLED(CONFIG_MODULES)) 1503 preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules"); 1504 if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) { 1505 preallocate_pgd_pages_range(VMEMMAP_START, VMEMMAP_END, "vmemmap"); 1506 preallocate_pgd_pages_range(PAGE_OFFSET, PAGE_END, "direct map"); 1507 if (IS_ENABLED(CONFIG_KASAN)) 1508 preallocate_pgd_pages_range(KASAN_SHADOW_START, KASAN_SHADOW_END, "kasan"); 1509 } 1510 } 1511 #endif 1512 1513 #ifdef CONFIG_EXECMEM 1514 #ifdef CONFIG_MMU 1515 static struct execmem_info execmem_info __ro_after_init; 1516 1517 struct execmem_info __init *execmem_arch_setup(void) 1518 { 1519 execmem_info = (struct execmem_info){ 1520 .ranges = { 1521 [EXECMEM_DEFAULT] = { 1522 .start = MODULES_VADDR, 1523 .end = MODULES_END, 1524 .pgprot = PAGE_KERNEL, 1525 .alignment = 1, 1526 }, 1527 [EXECMEM_KPROBES] = { 1528 .start = VMALLOC_START, 1529 .end = VMALLOC_END, 1530 .pgprot = PAGE_KERNEL_READ_EXEC, 1531 .alignment = 1, 1532 }, 1533 [EXECMEM_BPF] = { 1534 .start = BPF_JIT_REGION_START, 1535 .end = BPF_JIT_REGION_END, 1536 .pgprot = PAGE_KERNEL, 1537 .alignment = PAGE_SIZE, 1538 }, 1539 }, 1540 }; 1541 1542 return &execmem_info; 1543 } 1544 #endif /* CONFIG_MMU */ 1545 #endif /* CONFIG_EXECMEM */ 1546 1547 #ifdef CONFIG_MEMORY_HOTPLUG 1548 static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) 1549 { 1550 struct page *page = pmd_page(*pmd); 1551 struct ptdesc *ptdesc = page_ptdesc(page); 1552 pte_t *pte; 1553 int i; 1554 1555 for (i = 0; i < PTRS_PER_PTE; i++) { 1556 pte = pte_start + i; 1557 if (!pte_none(*pte)) 1558 return; 1559 } 1560 1561 pagetable_pte_dtor(ptdesc); 1562 if (PageReserved(page)) 1563 free_reserved_page(page); 1564 else 1565 pagetable_free(ptdesc); 1566 pmd_clear(pmd); 1567 } 1568 1569 static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud) 1570 { 1571 struct page *page = pud_page(*pud); 1572 struct ptdesc *ptdesc = page_ptdesc(page); 1573 pmd_t *pmd; 1574 int i; 1575 1576 for (i = 0; i < PTRS_PER_PMD; i++) { 1577 pmd = pmd_start + i; 1578 if (!pmd_none(*pmd)) 1579 return; 1580 } 1581 1582 pagetable_pmd_dtor(ptdesc); 1583 if (PageReserved(page)) 1584 free_reserved_page(page); 1585 else 1586 pagetable_free(ptdesc); 1587 pud_clear(pud); 1588 } 1589 1590 static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d) 1591 { 1592 struct page *page = p4d_page(*p4d); 1593 pud_t *pud; 1594 int i; 1595 1596 for (i = 0; i < PTRS_PER_PUD; i++) { 1597 pud = pud_start + i; 1598 if (!pud_none(*pud)) 1599 return; 1600 } 1601 1602 if (PageReserved(page)) 1603 free_reserved_page(page); 1604 else 1605 free_pages((unsigned long)page_address(page), 0); 1606 p4d_clear(p4d); 1607 } 1608 1609 static void __meminit free_vmemmap_storage(struct page *page, size_t size, 1610 struct vmem_altmap *altmap) 1611 { 1612 int order = get_order(size); 1613 1614 if (altmap) { 1615 vmem_altmap_free(altmap, size >> PAGE_SHIFT); 1616 return; 1617 } 1618 1619 if (PageReserved(page)) { 1620 unsigned int nr_pages = 1 << order; 1621 1622 while (nr_pages--) 1623 free_reserved_page(page++); 1624 return; 1625 } 1626 1627 free_pages((unsigned long)page_address(page), order); 1628 } 1629 1630 static void __meminit remove_pte_mapping(pte_t *pte_base, unsigned long addr, unsigned long end, 1631 bool is_vmemmap, struct vmem_altmap *altmap) 1632 { 1633 unsigned long next; 1634 pte_t *ptep, pte; 1635 1636 for (; addr < end; addr = next) { 1637 next = (addr + PAGE_SIZE) & PAGE_MASK; 1638 if (next > end) 1639 next = end; 1640 1641 ptep = pte_base + pte_index(addr); 1642 pte = ptep_get(ptep); 1643 if (!pte_present(*ptep)) 1644 continue; 1645 1646 pte_clear(&init_mm, addr, ptep); 1647 if (is_vmemmap) 1648 free_vmemmap_storage(pte_page(pte), PAGE_SIZE, altmap); 1649 } 1650 } 1651 1652 static void __meminit remove_pmd_mapping(pmd_t *pmd_base, unsigned long addr, unsigned long end, 1653 bool is_vmemmap, struct vmem_altmap *altmap) 1654 { 1655 unsigned long next; 1656 pte_t *pte_base; 1657 pmd_t *pmdp, pmd; 1658 1659 for (; addr < end; addr = next) { 1660 next = pmd_addr_end(addr, end); 1661 pmdp = pmd_base + pmd_index(addr); 1662 pmd = pmdp_get(pmdp); 1663 if (!pmd_present(pmd)) 1664 continue; 1665 1666 if (pmd_leaf(pmd)) { 1667 pmd_clear(pmdp); 1668 if (is_vmemmap) 1669 free_vmemmap_storage(pmd_page(pmd), PMD_SIZE, altmap); 1670 continue; 1671 } 1672 1673 pte_base = (pte_t *)pmd_page_vaddr(*pmdp); 1674 remove_pte_mapping(pte_base, addr, next, is_vmemmap, altmap); 1675 free_pte_table(pte_base, pmdp); 1676 } 1677 } 1678 1679 static void __meminit remove_pud_mapping(pud_t *pud_base, unsigned long addr, unsigned long end, 1680 bool is_vmemmap, struct vmem_altmap *altmap) 1681 { 1682 unsigned long next; 1683 pud_t *pudp, pud; 1684 pmd_t *pmd_base; 1685 1686 for (; addr < end; addr = next) { 1687 next = pud_addr_end(addr, end); 1688 pudp = pud_base + pud_index(addr); 1689 pud = pudp_get(pudp); 1690 if (!pud_present(pud)) 1691 continue; 1692 1693 if (pud_leaf(pud)) { 1694 if (pgtable_l4_enabled) { 1695 pud_clear(pudp); 1696 if (is_vmemmap) 1697 free_vmemmap_storage(pud_page(pud), PUD_SIZE, altmap); 1698 } 1699 continue; 1700 } 1701 1702 pmd_base = pmd_offset(pudp, 0); 1703 remove_pmd_mapping(pmd_base, addr, next, is_vmemmap, altmap); 1704 1705 if (pgtable_l4_enabled) 1706 free_pmd_table(pmd_base, pudp); 1707 } 1708 } 1709 1710 static void __meminit remove_p4d_mapping(p4d_t *p4d_base, unsigned long addr, unsigned long end, 1711 bool is_vmemmap, struct vmem_altmap *altmap) 1712 { 1713 unsigned long next; 1714 p4d_t *p4dp, p4d; 1715 pud_t *pud_base; 1716 1717 for (; addr < end; addr = next) { 1718 next = p4d_addr_end(addr, end); 1719 p4dp = p4d_base + p4d_index(addr); 1720 p4d = p4dp_get(p4dp); 1721 if (!p4d_present(p4d)) 1722 continue; 1723 1724 if (p4d_leaf(p4d)) { 1725 if (pgtable_l5_enabled) { 1726 p4d_clear(p4dp); 1727 if (is_vmemmap) 1728 free_vmemmap_storage(p4d_page(p4d), P4D_SIZE, altmap); 1729 } 1730 continue; 1731 } 1732 1733 pud_base = pud_offset(p4dp, 0); 1734 remove_pud_mapping(pud_base, addr, next, is_vmemmap, altmap); 1735 1736 if (pgtable_l5_enabled) 1737 free_pud_table(pud_base, p4dp); 1738 } 1739 } 1740 1741 static void __meminit remove_pgd_mapping(unsigned long va, unsigned long end, bool is_vmemmap, 1742 struct vmem_altmap *altmap) 1743 { 1744 unsigned long addr, next; 1745 p4d_t *p4d_base; 1746 pgd_t *pgd; 1747 1748 for (addr = va; addr < end; addr = next) { 1749 next = pgd_addr_end(addr, end); 1750 pgd = pgd_offset_k(addr); 1751 1752 if (!pgd_present(*pgd)) 1753 continue; 1754 1755 if (pgd_leaf(*pgd)) 1756 continue; 1757 1758 p4d_base = p4d_offset(pgd, 0); 1759 remove_p4d_mapping(p4d_base, addr, next, is_vmemmap, altmap); 1760 } 1761 1762 flush_tlb_all(); 1763 } 1764 1765 static void __meminit remove_linear_mapping(phys_addr_t start, u64 size) 1766 { 1767 unsigned long va = (unsigned long)__va(start); 1768 unsigned long end = (unsigned long)__va(start + size); 1769 1770 remove_pgd_mapping(va, end, false, NULL); 1771 } 1772 1773 struct range arch_get_mappable_range(void) 1774 { 1775 struct range mhp_range; 1776 1777 mhp_range.start = __pa(PAGE_OFFSET); 1778 mhp_range.end = __pa(PAGE_END - 1); 1779 return mhp_range; 1780 } 1781 1782 int __ref arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params) 1783 { 1784 int ret = 0; 1785 1786 create_linear_mapping_range(start, start + size, 0, ¶ms->pgprot); 1787 ret = __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT, params); 1788 if (ret) { 1789 remove_linear_mapping(start, size); 1790 goto out; 1791 } 1792 1793 max_pfn = PFN_UP(start + size); 1794 max_low_pfn = max_pfn; 1795 1796 out: 1797 flush_tlb_all(); 1798 return ret; 1799 } 1800 1801 void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) 1802 { 1803 __remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT, altmap); 1804 remove_linear_mapping(start, size); 1805 flush_tlb_all(); 1806 } 1807 1808 void __ref vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap) 1809 { 1810 remove_pgd_mapping(start, end, true, altmap); 1811 } 1812 #endif /* CONFIG_MEMORY_HOTPLUG */ 1813