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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/x86_64/mm/init.c
4 *
5 * Copyright (C) 1995 Linus Torvalds
6 * Copyright (C) 2000 Pavel Machek <pavel@ucw.cz>
7 * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
8 */
9
10#include <linux/signal.h>
11#include <linux/sched.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/string.h>
15#include <linux/types.h>
16#include <linux/ptrace.h>
17#include <linux/mman.h>
18#include <linux/mm.h>
19#include <linux/swap.h>
20#include <linux/smp.h>
21#include <linux/init.h>
22#include <linux/initrd.h>
23#include <linux/pagemap.h>
24#include <linux/memblock.h>
25#include <linux/proc_fs.h>
26#include <linux/pci.h>
27#include <linux/pfn.h>
28#include <linux/poison.h>
29#include <linux/dma-mapping.h>
30#include <linux/memory.h>
31#include <linux/memory_hotplug.h>
32#include <linux/memremap.h>
33#include <linux/nmi.h>
34#include <linux/gfp.h>
35#include <linux/kcore.h>
36#include <linux/bootmem_info.h>
37
38#include <asm/processor.h>
39#include <asm/bios_ebda.h>
40#include <linux/uaccess.h>
41#include <asm/pgalloc.h>
42#include <asm/dma.h>
43#include <asm/fixmap.h>
44#include <asm/e820/api.h>
45#include <asm/apic.h>
46#include <asm/tlb.h>
47#include <asm/mmu_context.h>
48#include <asm/proto.h>
49#include <asm/smp.h>
50#include <asm/sections.h>
51#include <asm/kdebug.h>
52#include <asm/numa.h>
53#include <asm/set_memory.h>
54#include <asm/init.h>
55#include <asm/uv/uv.h>
56#include <asm/setup.h>
57#include <asm/ftrace.h>
58
59#include "mm_internal.h"
60
61#include "ident_map.c"
62
63#define DEFINE_POPULATE(fname, type1, type2, init) \
64static inline void fname##_init(struct mm_struct *mm, \
65 type1##_t *arg1, type2##_t *arg2, bool init) \
66{ \
67 if (init) \
68 fname##_safe(mm, arg1, arg2); \
69 else \
70 fname(mm, arg1, arg2); \
71}
72
73DEFINE_POPULATE(p4d_populate, p4d, pud, init)
74DEFINE_POPULATE(pgd_populate, pgd, p4d, init)
75DEFINE_POPULATE(pud_populate, pud, pmd, init)
76DEFINE_POPULATE(pmd_populate_kernel, pmd, pte, init)
77
78#define DEFINE_ENTRY(type1, type2, init) \
79static inline void set_##type1##_init(type1##_t *arg1, \
80 type2##_t arg2, bool init) \
81{ \
82 if (init) \
83 set_##type1##_safe(arg1, arg2); \
84 else \
85 set_##type1(arg1, arg2); \
86}
87
88DEFINE_ENTRY(p4d, p4d, init)
89DEFINE_ENTRY(pud, pud, init)
90DEFINE_ENTRY(pmd, pmd, init)
91DEFINE_ENTRY(pte, pte, init)
92
93static inline pgprot_t prot_sethuge(pgprot_t prot)
94{
95 WARN_ON_ONCE(pgprot_val(prot) & _PAGE_PAT);
96
97 return __pgprot(pgprot_val(prot) | _PAGE_PSE);
98}
99
100/*
101 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
102 * physical space so we can cache the place of the first one and move
103 * around without checking the pgd every time.
104 */
105
106/* Bits supported by the hardware: */
107pteval_t __supported_pte_mask __read_mostly = ~0;
108/* Bits allowed in normal kernel mappings: */
109pteval_t __default_kernel_pte_mask __read_mostly = ~0;
110EXPORT_SYMBOL_GPL(__supported_pte_mask);
111/* Used in PAGE_KERNEL_* macros which are reasonably used out-of-tree: */
112EXPORT_SYMBOL(__default_kernel_pte_mask);
113
114int force_personality32;
115
116/*
117 * noexec32=on|off
118 * Control non executable heap for 32bit processes.
119 *
120 * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
121 * off PROT_READ implies PROT_EXEC
122 */
123static int __init nonx32_setup(char *str)
124{
125 if (!strcmp(str, "on"))
126 force_personality32 &= ~READ_IMPLIES_EXEC;
127 else if (!strcmp(str, "off"))
128 force_personality32 |= READ_IMPLIES_EXEC;
129 return 1;
130}
131__setup("noexec32=", nonx32_setup);
132
133static void sync_global_pgds_l5(unsigned long start, unsigned long end)
134{
135 unsigned long addr;
136
137 for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
138 const pgd_t *pgd_ref = pgd_offset_k(addr);
139 struct page *page;
140
141 /* Check for overflow */
142 if (addr < start)
143 break;
144
145 if (pgd_none(*pgd_ref))
146 continue;
147
148 spin_lock(&pgd_lock);
149 list_for_each_entry(page, &pgd_list, lru) {
150 pgd_t *pgd;
151 spinlock_t *pgt_lock;
152
153 pgd = (pgd_t *)page_address(page) + pgd_index(addr);
154 /* the pgt_lock only for Xen */
155 pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
156 spin_lock(pgt_lock);
157
158 if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
159 BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
160
161 if (pgd_none(*pgd))
162 set_pgd(pgd, *pgd_ref);
163
164 spin_unlock(pgt_lock);
165 }
166 spin_unlock(&pgd_lock);
167 }
168}
169
170static void sync_global_pgds_l4(unsigned long start, unsigned long end)
171{
172 unsigned long addr;
173
174 for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
175 pgd_t *pgd_ref = pgd_offset_k(addr);
176 const p4d_t *p4d_ref;
177 struct page *page;
178
179 /*
180 * With folded p4d, pgd_none() is always false, we need to
181 * handle synchronization on p4d level.
182 */
183 MAYBE_BUILD_BUG_ON(pgd_none(*pgd_ref));
184 p4d_ref = p4d_offset(pgd_ref, addr);
185
186 if (p4d_none(*p4d_ref))
187 continue;
188
189 spin_lock(&pgd_lock);
190 list_for_each_entry(page, &pgd_list, lru) {
191 pgd_t *pgd;
192 p4d_t *p4d;
193 spinlock_t *pgt_lock;
194
195 pgd = (pgd_t *)page_address(page) + pgd_index(addr);
196 p4d = p4d_offset(pgd, addr);
197 /* the pgt_lock only for Xen */
198 pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
199 spin_lock(pgt_lock);
200
201 if (!p4d_none(*p4d_ref) && !p4d_none(*p4d))
202 BUG_ON(p4d_pgtable(*p4d)
203 != p4d_pgtable(*p4d_ref));
204
205 if (p4d_none(*p4d))
206 set_p4d(p4d, *p4d_ref);
207
208 spin_unlock(pgt_lock);
209 }
210 spin_unlock(&pgd_lock);
211 }
212}
213
214/*
215 * When memory was added make sure all the processes MM have
216 * suitable PGD entries in the local PGD level page.
217 */
218static void sync_global_pgds(unsigned long start, unsigned long end)
219{
220 if (pgtable_l5_enabled())
221 sync_global_pgds_l5(start, end);
222 else
223 sync_global_pgds_l4(start, end);
224}
225
226/*
227 * NOTE: This function is marked __ref because it calls __init function
228 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
229 */
230static __ref void *spp_getpage(void)
231{
232 void *ptr;
233
234 if (after_bootmem)
235 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
236 else
237 ptr = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
238
239 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
240 panic("set_pte_phys: cannot allocate page data %s\n",
241 after_bootmem ? "after bootmem" : "");
242 }
243
244 pr_debug("spp_getpage %p\n", ptr);
245
246 return ptr;
247}
248
249static p4d_t *fill_p4d(pgd_t *pgd, unsigned long vaddr)
250{
251 if (pgd_none(*pgd)) {
252 p4d_t *p4d = (p4d_t *)spp_getpage();
253 pgd_populate(&init_mm, pgd, p4d);
254 if (p4d != p4d_offset(pgd, 0))
255 printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
256 p4d, p4d_offset(pgd, 0));
257 }
258 return p4d_offset(pgd, vaddr);
259}
260
261static pud_t *fill_pud(p4d_t *p4d, unsigned long vaddr)
262{
263 if (p4d_none(*p4d)) {
264 pud_t *pud = (pud_t *)spp_getpage();
265 p4d_populate(&init_mm, p4d, pud);
266 if (pud != pud_offset(p4d, 0))
267 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
268 pud, pud_offset(p4d, 0));
269 }
270 return pud_offset(p4d, vaddr);
271}
272
273static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
274{
275 if (pud_none(*pud)) {
276 pmd_t *pmd = (pmd_t *) spp_getpage();
277 pud_populate(&init_mm, pud, pmd);
278 if (pmd != pmd_offset(pud, 0))
279 printk(KERN_ERR "PAGETABLE BUG #02! %p <-> %p\n",
280 pmd, pmd_offset(pud, 0));
281 }
282 return pmd_offset(pud, vaddr);
283}
284
285static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
286{
287 if (pmd_none(*pmd)) {
288 pte_t *pte = (pte_t *) spp_getpage();
289 pmd_populate_kernel(&init_mm, pmd, pte);
290 if (pte != pte_offset_kernel(pmd, 0))
291 printk(KERN_ERR "PAGETABLE BUG #03!\n");
292 }
293 return pte_offset_kernel(pmd, vaddr);
294}
295
296static void __set_pte_vaddr(pud_t *pud, unsigned long vaddr, pte_t new_pte)
297{
298 pmd_t *pmd = fill_pmd(pud, vaddr);
299 pte_t *pte = fill_pte(pmd, vaddr);
300
301 set_pte(pte, new_pte);
302
303 /*
304 * It's enough to flush this one mapping.
305 * (PGE mappings get flushed as well)
306 */
307 flush_tlb_one_kernel(vaddr);
308}
309
310void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte)
311{
312 p4d_t *p4d = p4d_page + p4d_index(vaddr);
313 pud_t *pud = fill_pud(p4d, vaddr);
314
315 __set_pte_vaddr(pud, vaddr, new_pte);
316}
317
318void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
319{
320 pud_t *pud = pud_page + pud_index(vaddr);
321
322 __set_pte_vaddr(pud, vaddr, new_pte);
323}
324
325void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
326{
327 pgd_t *pgd;
328 p4d_t *p4d_page;
329
330 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
331
332 pgd = pgd_offset_k(vaddr);
333 if (pgd_none(*pgd)) {
334 printk(KERN_ERR
335 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
336 return;
337 }
338
339 p4d_page = p4d_offset(pgd, 0);
340 set_pte_vaddr_p4d(p4d_page, vaddr, pteval);
341}
342
343pmd_t * __init populate_extra_pmd(unsigned long vaddr)
344{
345 pgd_t *pgd;
346 p4d_t *p4d;
347 pud_t *pud;
348
349 pgd = pgd_offset_k(vaddr);
350 p4d = fill_p4d(pgd, vaddr);
351 pud = fill_pud(p4d, vaddr);
352 return fill_pmd(pud, vaddr);
353}
354
355pte_t * __init populate_extra_pte(unsigned long vaddr)
356{
357 pmd_t *pmd;
358
359 pmd = populate_extra_pmd(vaddr);
360 return fill_pte(pmd, vaddr);
361}
362
363/*
364 * Create large page table mappings for a range of physical addresses.
365 */
366static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
367 enum page_cache_mode cache)
368{
369 pgd_t *pgd;
370 p4d_t *p4d;
371 pud_t *pud;
372 pmd_t *pmd;
373 pgprot_t prot;
374
375 pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) |
376 protval_4k_2_large(cachemode2protval(cache));
377 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
378 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
379 pgd = pgd_offset_k((unsigned long)__va(phys));
380 if (pgd_none(*pgd)) {
381 p4d = (p4d_t *) spp_getpage();
382 set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE |
383 _PAGE_USER));
384 }
385 p4d = p4d_offset(pgd, (unsigned long)__va(phys));
386 if (p4d_none(*p4d)) {
387 pud = (pud_t *) spp_getpage();
388 set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE |
389 _PAGE_USER));
390 }
391 pud = pud_offset(p4d, (unsigned long)__va(phys));
392 if (pud_none(*pud)) {
393 pmd = (pmd_t *) spp_getpage();
394 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
395 _PAGE_USER));
396 }
397 pmd = pmd_offset(pud, phys);
398 BUG_ON(!pmd_none(*pmd));
399 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
400 }
401}
402
403void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
404{
405 __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB);
406}
407
408void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
409{
410 __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC);
411}
412
413/*
414 * The head.S code sets up the kernel high mapping:
415 *
416 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
417 *
418 * phys_base holds the negative offset to the kernel, which is added
419 * to the compile time generated pmds. This results in invalid pmds up
420 * to the point where we hit the physaddr 0 mapping.
421 *
422 * We limit the mappings to the region from _text to _brk_end. _brk_end
423 * is rounded up to the 2MB boundary. This catches the invalid pmds as
424 * well, as they are located before _text:
425 */
426void __init cleanup_highmap(void)
427{
428 unsigned long vaddr = __START_KERNEL_map;
429 unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;
430 unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
431 pmd_t *pmd = level2_kernel_pgt;
432
433 /*
434 * Native path, max_pfn_mapped is not set yet.
435 * Xen has valid max_pfn_mapped set in
436 * arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().
437 */
438 if (max_pfn_mapped)
439 vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
440
441 for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
442 if (pmd_none(*pmd))
443 continue;
444 if (vaddr < (unsigned long) _text || vaddr > end)
445 set_pmd(pmd, __pmd(0));
446 }
447}
448
449/*
450 * Create PTE level page table mapping for physical addresses.
451 * It returns the last physical address mapped.
452 */
453static unsigned long __meminit
454phys_pte_init(pte_t *pte_page, unsigned long paddr, unsigned long paddr_end,
455 pgprot_t prot, bool init)
456{
457 unsigned long pages = 0, paddr_next;
458 unsigned long paddr_last = paddr_end;
459 pte_t *pte;
460 int i;
461
462 pte = pte_page + pte_index(paddr);
463 i = pte_index(paddr);
464
465 for (; i < PTRS_PER_PTE; i++, paddr = paddr_next, pte++) {
466 paddr_next = (paddr & PAGE_MASK) + PAGE_SIZE;
467 if (paddr >= paddr_end) {
468 if (!after_bootmem &&
469 !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
470 E820_TYPE_RAM) &&
471 !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
472 E820_TYPE_RESERVED_KERN))
473 set_pte_init(pte, __pte(0), init);
474 continue;
475 }
476
477 /*
478 * We will re-use the existing mapping.
479 * Xen for example has some special requirements, like mapping
480 * pagetable pages as RO. So assume someone who pre-setup
481 * these mappings are more intelligent.
482 */
483 if (!pte_none(*pte)) {
484 if (!after_bootmem)
485 pages++;
486 continue;
487 }
488
489 if (0)
490 pr_info(" pte=%p addr=%lx pte=%016lx\n", pte, paddr,
491 pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL).pte);
492 pages++;
493 set_pte_init(pte, pfn_pte(paddr >> PAGE_SHIFT, prot), init);
494 paddr_last = (paddr & PAGE_MASK) + PAGE_SIZE;
495 }
496
497 update_page_count(PG_LEVEL_4K, pages);
498
499 return paddr_last;
500}
501
502/*
503 * Create PMD level page table mapping for physical addresses. The virtual
504 * and physical address have to be aligned at this level.
505 * It returns the last physical address mapped.
506 */
507static unsigned long __meminit
508phys_pmd_init(pmd_t *pmd_page, unsigned long paddr, unsigned long paddr_end,
509 unsigned long page_size_mask, pgprot_t prot, bool init)
510{
511 unsigned long pages = 0, paddr_next;
512 unsigned long paddr_last = paddr_end;
513
514 int i = pmd_index(paddr);
515
516 for (; i < PTRS_PER_PMD; i++, paddr = paddr_next) {
517 pmd_t *pmd = pmd_page + pmd_index(paddr);
518 pte_t *pte;
519 pgprot_t new_prot = prot;
520
521 paddr_next = (paddr & PMD_MASK) + PMD_SIZE;
522 if (paddr >= paddr_end) {
523 if (!after_bootmem &&
524 !e820__mapped_any(paddr & PMD_MASK, paddr_next,
525 E820_TYPE_RAM) &&
526 !e820__mapped_any(paddr & PMD_MASK, paddr_next,
527 E820_TYPE_RESERVED_KERN))
528 set_pmd_init(pmd, __pmd(0), init);
529 continue;
530 }
531
532 if (!pmd_none(*pmd)) {
533 if (!pmd_large(*pmd)) {
534 spin_lock(&init_mm.page_table_lock);
535 pte = (pte_t *)pmd_page_vaddr(*pmd);
536 paddr_last = phys_pte_init(pte, paddr,
537 paddr_end, prot,
538 init);
539 spin_unlock(&init_mm.page_table_lock);
540 continue;
541 }
542 /*
543 * If we are ok with PG_LEVEL_2M mapping, then we will
544 * use the existing mapping,
545 *
546 * Otherwise, we will split the large page mapping but
547 * use the same existing protection bits except for
548 * large page, so that we don't violate Intel's TLB
549 * Application note (317080) which says, while changing
550 * the page sizes, new and old translations should
551 * not differ with respect to page frame and
552 * attributes.
553 */
554 if (page_size_mask & (1 << PG_LEVEL_2M)) {
555 if (!after_bootmem)
556 pages++;
557 paddr_last = paddr_next;
558 continue;
559 }
560 new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
561 }
562
563 if (page_size_mask & (1<<PG_LEVEL_2M)) {
564 pages++;
565 spin_lock(&init_mm.page_table_lock);
566 set_pmd_init(pmd,
567 pfn_pmd(paddr >> PAGE_SHIFT, prot_sethuge(prot)),
568 init);
569 spin_unlock(&init_mm.page_table_lock);
570 paddr_last = paddr_next;
571 continue;
572 }
573
574 pte = alloc_low_page();
575 paddr_last = phys_pte_init(pte, paddr, paddr_end, new_prot, init);
576
577 spin_lock(&init_mm.page_table_lock);
578 pmd_populate_kernel_init(&init_mm, pmd, pte, init);
579 spin_unlock(&init_mm.page_table_lock);
580 }
581 update_page_count(PG_LEVEL_2M, pages);
582 return paddr_last;
583}
584
585/*
586 * Create PUD level page table mapping for physical addresses. The virtual
587 * and physical address do not have to be aligned at this level. KASLR can
588 * randomize virtual addresses up to this level.
589 * It returns the last physical address mapped.
590 */
591static unsigned long __meminit
592phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
593 unsigned long page_size_mask, pgprot_t _prot, bool init)
594{
595 unsigned long pages = 0, paddr_next;
596 unsigned long paddr_last = paddr_end;
597 unsigned long vaddr = (unsigned long)__va(paddr);
598 int i = pud_index(vaddr);
599
600 for (; i < PTRS_PER_PUD; i++, paddr = paddr_next) {
601 pud_t *pud;
602 pmd_t *pmd;
603 pgprot_t prot = _prot;
604
605 vaddr = (unsigned long)__va(paddr);
606 pud = pud_page + pud_index(vaddr);
607 paddr_next = (paddr & PUD_MASK) + PUD_SIZE;
608
609 if (paddr >= paddr_end) {
610 if (!after_bootmem &&
611 !e820__mapped_any(paddr & PUD_MASK, paddr_next,
612 E820_TYPE_RAM) &&
613 !e820__mapped_any(paddr & PUD_MASK, paddr_next,
614 E820_TYPE_RESERVED_KERN))
615 set_pud_init(pud, __pud(0), init);
616 continue;
617 }
618
619 if (!pud_none(*pud)) {
620 if (!pud_large(*pud)) {
621 pmd = pmd_offset(pud, 0);
622 paddr_last = phys_pmd_init(pmd, paddr,
623 paddr_end,
624 page_size_mask,
625 prot, init);
626 continue;
627 }
628 /*
629 * If we are ok with PG_LEVEL_1G mapping, then we will
630 * use the existing mapping.
631 *
632 * Otherwise, we will split the gbpage mapping but use
633 * the same existing protection bits except for large
634 * page, so that we don't violate Intel's TLB
635 * Application note (317080) which says, while changing
636 * the page sizes, new and old translations should
637 * not differ with respect to page frame and
638 * attributes.
639 */
640 if (page_size_mask & (1 << PG_LEVEL_1G)) {
641 if (!after_bootmem)
642 pages++;
643 paddr_last = paddr_next;
644 continue;
645 }
646 prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
647 }
648
649 if (page_size_mask & (1<<PG_LEVEL_1G)) {
650 pages++;
651 spin_lock(&init_mm.page_table_lock);
652 set_pud_init(pud,
653 pfn_pud(paddr >> PAGE_SHIFT, prot_sethuge(prot)),
654 init);
655 spin_unlock(&init_mm.page_table_lock);
656 paddr_last = paddr_next;
657 continue;
658 }
659
660 pmd = alloc_low_page();
661 paddr_last = phys_pmd_init(pmd, paddr, paddr_end,
662 page_size_mask, prot, init);
663
664 spin_lock(&init_mm.page_table_lock);
665 pud_populate_init(&init_mm, pud, pmd, init);
666 spin_unlock(&init_mm.page_table_lock);
667 }
668
669 update_page_count(PG_LEVEL_1G, pages);
670
671 return paddr_last;
672}
673
674static unsigned long __meminit
675phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end,
676 unsigned long page_size_mask, pgprot_t prot, bool init)
677{
678 unsigned long vaddr, vaddr_end, vaddr_next, paddr_next, paddr_last;
679
680 paddr_last = paddr_end;
681 vaddr = (unsigned long)__va(paddr);
682 vaddr_end = (unsigned long)__va(paddr_end);
683
684 if (!pgtable_l5_enabled())
685 return phys_pud_init((pud_t *) p4d_page, paddr, paddr_end,
686 page_size_mask, prot, init);
687
688 for (; vaddr < vaddr_end; vaddr = vaddr_next) {
689 p4d_t *p4d = p4d_page + p4d_index(vaddr);
690 pud_t *pud;
691
692 vaddr_next = (vaddr & P4D_MASK) + P4D_SIZE;
693 paddr = __pa(vaddr);
694
695 if (paddr >= paddr_end) {
696 paddr_next = __pa(vaddr_next);
697 if (!after_bootmem &&
698 !e820__mapped_any(paddr & P4D_MASK, paddr_next,
699 E820_TYPE_RAM) &&
700 !e820__mapped_any(paddr & P4D_MASK, paddr_next,
701 E820_TYPE_RESERVED_KERN))
702 set_p4d_init(p4d, __p4d(0), init);
703 continue;
704 }
705
706 if (!p4d_none(*p4d)) {
707 pud = pud_offset(p4d, 0);
708 paddr_last = phys_pud_init(pud, paddr, __pa(vaddr_end),
709 page_size_mask, prot, init);
710 continue;
711 }
712
713 pud = alloc_low_page();
714 paddr_last = phys_pud_init(pud, paddr, __pa(vaddr_end),
715 page_size_mask, prot, init);
716
717 spin_lock(&init_mm.page_table_lock);
718 p4d_populate_init(&init_mm, p4d, pud, init);
719 spin_unlock(&init_mm.page_table_lock);
720 }
721
722 return paddr_last;
723}
724
725static unsigned long __meminit
726__kernel_physical_mapping_init(unsigned long paddr_start,
727 unsigned long paddr_end,
728 unsigned long page_size_mask,
729 pgprot_t prot, bool init)
730{
731 bool pgd_changed = false;
732 unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last;
733
734 paddr_last = paddr_end;
735 vaddr = (unsigned long)__va(paddr_start);
736 vaddr_end = (unsigned long)__va(paddr_end);
737 vaddr_start = vaddr;
738
739 for (; vaddr < vaddr_end; vaddr = vaddr_next) {
740 pgd_t *pgd = pgd_offset_k(vaddr);
741 p4d_t *p4d;
742
743 vaddr_next = (vaddr & PGDIR_MASK) + PGDIR_SIZE;
744
745 if (pgd_val(*pgd)) {
746 p4d = (p4d_t *)pgd_page_vaddr(*pgd);
747 paddr_last = phys_p4d_init(p4d, __pa(vaddr),
748 __pa(vaddr_end),
749 page_size_mask,
750 prot, init);
751 continue;
752 }
753
754 p4d = alloc_low_page();
755 paddr_last = phys_p4d_init(p4d, __pa(vaddr), __pa(vaddr_end),
756 page_size_mask, prot, init);
757
758 spin_lock(&init_mm.page_table_lock);
759 if (pgtable_l5_enabled())
760 pgd_populate_init(&init_mm, pgd, p4d, init);
761 else
762 p4d_populate_init(&init_mm, p4d_offset(pgd, vaddr),
763 (pud_t *) p4d, init);
764
765 spin_unlock(&init_mm.page_table_lock);
766 pgd_changed = true;
767 }
768
769 if (pgd_changed)
770 sync_global_pgds(vaddr_start, vaddr_end - 1);
771
772 return paddr_last;
773}
774
775
776/*
777 * Create page table mapping for the physical memory for specific physical
778 * addresses. Note that it can only be used to populate non-present entries.
779 * The virtual and physical addresses have to be aligned on PMD level
780 * down. It returns the last physical address mapped.
781 */
782unsigned long __meminit
783kernel_physical_mapping_init(unsigned long paddr_start,
784 unsigned long paddr_end,
785 unsigned long page_size_mask, pgprot_t prot)
786{
787 return __kernel_physical_mapping_init(paddr_start, paddr_end,
788 page_size_mask, prot, true);
789}
790
791/*
792 * This function is similar to kernel_physical_mapping_init() above with the
793 * exception that it uses set_{pud,pmd}() instead of the set_{pud,pte}_safe()
794 * when updating the mapping. The caller is responsible to flush the TLBs after
795 * the function returns.
796 */
797unsigned long __meminit
798kernel_physical_mapping_change(unsigned long paddr_start,
799 unsigned long paddr_end,
800 unsigned long page_size_mask)
801{
802 return __kernel_physical_mapping_init(paddr_start, paddr_end,
803 page_size_mask, PAGE_KERNEL,
804 false);
805}
806
807#ifndef CONFIG_NUMA
808void __init initmem_init(void)
809{
810 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
811}
812#endif
813
814void __init paging_init(void)
815{
816 sparse_init();
817
818 /*
819 * clear the default setting with node 0
820 * note: don't use nodes_clear here, that is really clearing when
821 * numa support is not compiled in, and later node_set_state
822 * will not set it back.
823 */
824 node_clear_state(0, N_MEMORY);
825 node_clear_state(0, N_NORMAL_MEMORY);
826
827 zone_sizes_init();
828}
829
830#ifdef CONFIG_SPARSEMEM_VMEMMAP
831#define PAGE_UNUSED 0xFD
832
833/*
834 * The unused vmemmap range, which was not yet memset(PAGE_UNUSED), ranges
835 * from unused_pmd_start to next PMD_SIZE boundary.
836 */
837static unsigned long unused_pmd_start __meminitdata;
838
839static void __meminit vmemmap_flush_unused_pmd(void)
840{
841 if (!unused_pmd_start)
842 return;
843 /*
844 * Clears (unused_pmd_start, PMD_END]
845 */
846 memset((void *)unused_pmd_start, PAGE_UNUSED,
847 ALIGN(unused_pmd_start, PMD_SIZE) - unused_pmd_start);
848 unused_pmd_start = 0;
849}
850
851#ifdef CONFIG_MEMORY_HOTPLUG
852/* Returns true if the PMD is completely unused and thus it can be freed */
853static bool __meminit vmemmap_pmd_is_unused(unsigned long addr, unsigned long end)
854{
855 unsigned long start = ALIGN_DOWN(addr, PMD_SIZE);
856
857 /*
858 * Flush the unused range cache to ensure that memchr_inv() will work
859 * for the whole range.
860 */
861 vmemmap_flush_unused_pmd();
862 memset((void *)addr, PAGE_UNUSED, end - addr);
863
864 return !memchr_inv((void *)start, PAGE_UNUSED, PMD_SIZE);
865}
866#endif
867
868static void __meminit __vmemmap_use_sub_pmd(unsigned long start)
869{
870 /*
871 * As we expect to add in the same granularity as we remove, it's
872 * sufficient to mark only some piece used to block the memmap page from
873 * getting removed when removing some other adjacent memmap (just in
874 * case the first memmap never gets initialized e.g., because the memory
875 * block never gets onlined).
876 */
877 memset((void *)start, 0, sizeof(struct page));
878}
879
880static void __meminit vmemmap_use_sub_pmd(unsigned long start, unsigned long end)
881{
882 /*
883 * We only optimize if the new used range directly follows the
884 * previously unused range (esp., when populating consecutive sections).
885 */
886 if (unused_pmd_start == start) {
887 if (likely(IS_ALIGNED(end, PMD_SIZE)))
888 unused_pmd_start = 0;
889 else
890 unused_pmd_start = end;
891 return;
892 }
893
894 /*
895 * If the range does not contiguously follows previous one, make sure
896 * to mark the unused range of the previous one so it can be removed.
897 */
898 vmemmap_flush_unused_pmd();
899 __vmemmap_use_sub_pmd(start);
900}
901
902
903static void __meminit vmemmap_use_new_sub_pmd(unsigned long start, unsigned long end)
904{
905 const unsigned long page = ALIGN_DOWN(start, PMD_SIZE);
906
907 vmemmap_flush_unused_pmd();
908
909 /*
910 * Could be our memmap page is filled with PAGE_UNUSED already from a
911 * previous remove. Make sure to reset it.
912 */
913 __vmemmap_use_sub_pmd(start);
914
915 /*
916 * Mark with PAGE_UNUSED the unused parts of the new memmap range
917 */
918 if (!IS_ALIGNED(start, PMD_SIZE))
919 memset((void *)page, PAGE_UNUSED, start - page);
920
921 /*
922 * We want to avoid memset(PAGE_UNUSED) when populating the vmemmap of
923 * consecutive sections. Remember for the last added PMD where the
924 * unused range begins.
925 */
926 if (!IS_ALIGNED(end, PMD_SIZE))
927 unused_pmd_start = end;
928}
929#endif
930
931/*
932 * Memory hotplug specific functions
933 */
934#ifdef CONFIG_MEMORY_HOTPLUG
935/*
936 * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
937 * updating.
938 */
939static void update_end_of_memory_vars(u64 start, u64 size)
940{
941 unsigned long end_pfn = PFN_UP(start + size);
942
943 if (end_pfn > max_pfn) {
944 max_pfn = end_pfn;
945 max_low_pfn = end_pfn;
946 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
947 }
948}
949
950int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
951 struct mhp_params *params)
952{
953 int ret;
954
955 ret = __add_pages(nid, start_pfn, nr_pages, params);
956 WARN_ON_ONCE(ret);
957
958 /* update max_pfn, max_low_pfn and high_memory */
959 update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
960 nr_pages << PAGE_SHIFT);
961
962 return ret;
963}
964
965int arch_add_memory(int nid, u64 start, u64 size,
966 struct mhp_params *params)
967{
968 unsigned long start_pfn = start >> PAGE_SHIFT;
969 unsigned long nr_pages = size >> PAGE_SHIFT;
970
971 init_memory_mapping(start, start + size, params->pgprot);
972
973 return add_pages(nid, start_pfn, nr_pages, params);
974}
975
976static void __meminit free_pagetable(struct page *page, int order)
977{
978 unsigned long magic;
979 unsigned int nr_pages = 1 << order;
980
981 /* bootmem page has reserved flag */
982 if (PageReserved(page)) {
983 __ClearPageReserved(page);
984
985 magic = page->index;
986 if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
987 while (nr_pages--)
988 put_page_bootmem(page++);
989 } else
990 while (nr_pages--)
991 free_reserved_page(page++);
992 } else
993 free_pages((unsigned long)page_address(page), order);
994}
995
996static void __meminit free_hugepage_table(struct page *page,
997 struct vmem_altmap *altmap)
998{
999 if (altmap)
1000 vmem_altmap_free(altmap, PMD_SIZE / PAGE_SIZE);
1001 else
1002 free_pagetable(page, get_order(PMD_SIZE));
1003}
1004
1005static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
1006{
1007 pte_t *pte;
1008 int i;
1009
1010 for (i = 0; i < PTRS_PER_PTE; i++) {
1011 pte = pte_start + i;
1012 if (!pte_none(*pte))
1013 return;
1014 }
1015
1016 /* free a pte talbe */
1017 free_pagetable(pmd_page(*pmd), 0);
1018 spin_lock(&init_mm.page_table_lock);
1019 pmd_clear(pmd);
1020 spin_unlock(&init_mm.page_table_lock);
1021}
1022
1023static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
1024{
1025 pmd_t *pmd;
1026 int i;
1027
1028 for (i = 0; i < PTRS_PER_PMD; i++) {
1029 pmd = pmd_start + i;
1030 if (!pmd_none(*pmd))
1031 return;
1032 }
1033
1034 /* free a pmd talbe */
1035 free_pagetable(pud_page(*pud), 0);
1036 spin_lock(&init_mm.page_table_lock);
1037 pud_clear(pud);
1038 spin_unlock(&init_mm.page_table_lock);
1039}
1040
1041static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
1042{
1043 pud_t *pud;
1044 int i;
1045
1046 for (i = 0; i < PTRS_PER_PUD; i++) {
1047 pud = pud_start + i;
1048 if (!pud_none(*pud))
1049 return;
1050 }
1051
1052 /* free a pud talbe */
1053 free_pagetable(p4d_page(*p4d), 0);
1054 spin_lock(&init_mm.page_table_lock);
1055 p4d_clear(p4d);
1056 spin_unlock(&init_mm.page_table_lock);
1057}
1058
1059static void __meminit
1060remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
1061 bool direct)
1062{
1063 unsigned long next, pages = 0;
1064 pte_t *pte;
1065 phys_addr_t phys_addr;
1066
1067 pte = pte_start + pte_index(addr);
1068 for (; addr < end; addr = next, pte++) {
1069 next = (addr + PAGE_SIZE) & PAGE_MASK;
1070 if (next > end)
1071 next = end;
1072
1073 if (!pte_present(*pte))
1074 continue;
1075
1076 /*
1077 * We mapped [0,1G) memory as identity mapping when
1078 * initializing, in arch/x86/kernel/head_64.S. These
1079 * pagetables cannot be removed.
1080 */
1081 phys_addr = pte_val(*pte) + (addr & PAGE_MASK);
1082 if (phys_addr < (phys_addr_t)0x40000000)
1083 return;
1084
1085 if (!direct)
1086 free_pagetable(pte_page(*pte), 0);
1087
1088 spin_lock(&init_mm.page_table_lock);
1089 pte_clear(&init_mm, addr, pte);
1090 spin_unlock(&init_mm.page_table_lock);
1091
1092 /* For non-direct mapping, pages means nothing. */
1093 pages++;
1094 }
1095
1096 /* Call free_pte_table() in remove_pmd_table(). */
1097 flush_tlb_all();
1098 if (direct)
1099 update_page_count(PG_LEVEL_4K, -pages);
1100}
1101
1102static void __meminit
1103remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
1104 bool direct, struct vmem_altmap *altmap)
1105{
1106 unsigned long next, pages = 0;
1107 pte_t *pte_base;
1108 pmd_t *pmd;
1109
1110 pmd = pmd_start + pmd_index(addr);
1111 for (; addr < end; addr = next, pmd++) {
1112 next = pmd_addr_end(addr, end);
1113
1114 if (!pmd_present(*pmd))
1115 continue;
1116
1117 if (pmd_large(*pmd)) {
1118 if (IS_ALIGNED(addr, PMD_SIZE) &&
1119 IS_ALIGNED(next, PMD_SIZE)) {
1120 if (!direct)
1121 free_hugepage_table(pmd_page(*pmd),
1122 altmap);
1123
1124 spin_lock(&init_mm.page_table_lock);
1125 pmd_clear(pmd);
1126 spin_unlock(&init_mm.page_table_lock);
1127 pages++;
1128 }
1129#ifdef CONFIG_SPARSEMEM_VMEMMAP
1130 else if (vmemmap_pmd_is_unused(addr, next)) {
1131 free_hugepage_table(pmd_page(*pmd),
1132 altmap);
1133 spin_lock(&init_mm.page_table_lock);
1134 pmd_clear(pmd);
1135 spin_unlock(&init_mm.page_table_lock);
1136 }
1137#endif
1138 continue;
1139 }
1140
1141 pte_base = (pte_t *)pmd_page_vaddr(*pmd);
1142 remove_pte_table(pte_base, addr, next, direct);
1143 free_pte_table(pte_base, pmd);
1144 }
1145
1146 /* Call free_pmd_table() in remove_pud_table(). */
1147 if (direct)
1148 update_page_count(PG_LEVEL_2M, -pages);
1149}
1150
1151static void __meminit
1152remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
1153 struct vmem_altmap *altmap, bool direct)
1154{
1155 unsigned long next, pages = 0;
1156 pmd_t *pmd_base;
1157 pud_t *pud;
1158
1159 pud = pud_start + pud_index(addr);
1160 for (; addr < end; addr = next, pud++) {
1161 next = pud_addr_end(addr, end);
1162
1163 if (!pud_present(*pud))
1164 continue;
1165
1166 if (pud_large(*pud) &&
1167 IS_ALIGNED(addr, PUD_SIZE) &&
1168 IS_ALIGNED(next, PUD_SIZE)) {
1169 spin_lock(&init_mm.page_table_lock);
1170 pud_clear(pud);
1171 spin_unlock(&init_mm.page_table_lock);
1172 pages++;
1173 continue;
1174 }
1175
1176 pmd_base = pmd_offset(pud, 0);
1177 remove_pmd_table(pmd_base, addr, next, direct, altmap);
1178 free_pmd_table(pmd_base, pud);
1179 }
1180
1181 if (direct)
1182 update_page_count(PG_LEVEL_1G, -pages);
1183}
1184
1185static void __meminit
1186remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
1187 struct vmem_altmap *altmap, bool direct)
1188{
1189 unsigned long next, pages = 0;
1190 pud_t *pud_base;
1191 p4d_t *p4d;
1192
1193 p4d = p4d_start + p4d_index(addr);
1194 for (; addr < end; addr = next, p4d++) {
1195 next = p4d_addr_end(addr, end);
1196
1197 if (!p4d_present(*p4d))
1198 continue;
1199
1200 BUILD_BUG_ON(p4d_large(*p4d));
1201
1202 pud_base = pud_offset(p4d, 0);
1203 remove_pud_table(pud_base, addr, next, altmap, direct);
1204 /*
1205 * For 4-level page tables we do not want to free PUDs, but in the
1206 * 5-level case we should free them. This code will have to change
1207 * to adapt for boot-time switching between 4 and 5 level page tables.
1208 */
1209 if (pgtable_l5_enabled())
1210 free_pud_table(pud_base, p4d);
1211 }
1212
1213 if (direct)
1214 update_page_count(PG_LEVEL_512G, -pages);
1215}
1216
1217/* start and end are both virtual address. */
1218static void __meminit
1219remove_pagetable(unsigned long start, unsigned long end, bool direct,
1220 struct vmem_altmap *altmap)
1221{
1222 unsigned long next;
1223 unsigned long addr;
1224 pgd_t *pgd;
1225 p4d_t *p4d;
1226
1227 for (addr = start; addr < end; addr = next) {
1228 next = pgd_addr_end(addr, end);
1229
1230 pgd = pgd_offset_k(addr);
1231 if (!pgd_present(*pgd))
1232 continue;
1233
1234 p4d = p4d_offset(pgd, 0);
1235 remove_p4d_table(p4d, addr, next, altmap, direct);
1236 }
1237
1238 flush_tlb_all();
1239}
1240
1241void __ref vmemmap_free(unsigned long start, unsigned long end,
1242 struct vmem_altmap *altmap)
1243{
1244 VM_BUG_ON(!PAGE_ALIGNED(start));
1245 VM_BUG_ON(!PAGE_ALIGNED(end));
1246
1247 remove_pagetable(start, end, false, altmap);
1248}
1249
1250static void __meminit
1251kernel_physical_mapping_remove(unsigned long start, unsigned long end)
1252{
1253 start = (unsigned long)__va(start);
1254 end = (unsigned long)__va(end);
1255
1256 remove_pagetable(start, end, true, NULL);
1257}
1258
1259void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
1260{
1261 unsigned long start_pfn = start >> PAGE_SHIFT;
1262 unsigned long nr_pages = size >> PAGE_SHIFT;
1263
1264 __remove_pages(start_pfn, nr_pages, altmap);
1265 kernel_physical_mapping_remove(start, start + size);
1266}
1267#endif /* CONFIG_MEMORY_HOTPLUG */
1268
1269static struct kcore_list kcore_vsyscall;
1270
1271static void __init register_page_bootmem_info(void)
1272{
1273#if defined(CONFIG_NUMA) || defined(CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP)
1274 int i;
1275
1276 for_each_online_node(i)
1277 register_page_bootmem_info_node(NODE_DATA(i));
1278#endif
1279}
1280
1281/*
1282 * Pre-allocates page-table pages for the vmalloc area in the kernel page-table.
1283 * Only the level which needs to be synchronized between all page-tables is
1284 * allocated because the synchronization can be expensive.
1285 */
1286static void __init preallocate_vmalloc_pages(void)
1287{
1288 unsigned long addr;
1289 const char *lvl;
1290
1291 for (addr = VMALLOC_START; addr <= VMEMORY_END; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
1292 pgd_t *pgd = pgd_offset_k(addr);
1293 p4d_t *p4d;
1294 pud_t *pud;
1295
1296 lvl = "p4d";
1297 p4d = p4d_alloc(&init_mm, pgd, addr);
1298 if (!p4d)
1299 goto failed;
1300
1301 if (pgtable_l5_enabled())
1302 continue;
1303
1304 /*
1305 * The goal here is to allocate all possibly required
1306 * hardware page tables pointed to by the top hardware
1307 * level.
1308 *
1309 * On 4-level systems, the P4D layer is folded away and
1310 * the above code does no preallocation. Below, go down
1311 * to the pud _software_ level to ensure the second
1312 * hardware level is allocated on 4-level systems too.
1313 */
1314 lvl = "pud";
1315 pud = pud_alloc(&init_mm, p4d, addr);
1316 if (!pud)
1317 goto failed;
1318 }
1319
1320 return;
1321
1322failed:
1323
1324 /*
1325 * The pages have to be there now or they will be missing in
1326 * process page-tables later.
1327 */
1328 panic("Failed to pre-allocate %s pages for vmalloc area\n", lvl);
1329}
1330
1331void __init mem_init(void)
1332{
1333 pci_iommu_alloc();
1334
1335 /* clear_bss() already clear the empty_zero_page */
1336
1337 /* this will put all memory onto the freelists */
1338 memblock_free_all();
1339 after_bootmem = 1;
1340 x86_init.hyper.init_after_bootmem();
1341
1342 /*
1343 * Must be done after boot memory is put on freelist, because here we
1344 * might set fields in deferred struct pages that have not yet been
1345 * initialized, and memblock_free_all() initializes all the reserved
1346 * deferred pages for us.
1347 */
1348 register_page_bootmem_info();
1349
1350 /* Register memory areas for /proc/kcore */
1351 if (get_gate_vma(&init_mm))
1352 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, PAGE_SIZE, KCORE_USER);
1353
1354 preallocate_vmalloc_pages();
1355}
1356
1357#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
1358int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask)
1359{
1360 /*
1361 * More CPUs always led to greater speedups on tested systems, up to
1362 * all the nodes' CPUs. Use all since the system is otherwise idle
1363 * now.
1364 */
1365 return max_t(int, cpumask_weight(node_cpumask), 1);
1366}
1367#endif
1368
1369int kernel_set_to_readonly;
1370
1371void mark_rodata_ro(void)
1372{
1373 unsigned long start = PFN_ALIGN(_text);
1374 unsigned long rodata_start = PFN_ALIGN(__start_rodata);
1375 unsigned long end = (unsigned long)__end_rodata_hpage_align;
1376 unsigned long text_end = PFN_ALIGN(_etext);
1377 unsigned long rodata_end = PFN_ALIGN(__end_rodata);
1378 unsigned long all_end;
1379
1380 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
1381 (end - start) >> 10);
1382 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
1383
1384 kernel_set_to_readonly = 1;
1385
1386 /*
1387 * The rodata/data/bss/brk section (but not the kernel text!)
1388 * should also be not-executable.
1389 *
1390 * We align all_end to PMD_SIZE because the existing mapping
1391 * is a full PMD. If we would align _brk_end to PAGE_SIZE we
1392 * split the PMD and the reminder between _brk_end and the end
1393 * of the PMD will remain mapped executable.
1394 *
1395 * Any PMD which was setup after the one which covers _brk_end
1396 * has been zapped already via cleanup_highmem().
1397 */
1398 all_end = roundup((unsigned long)_brk_end, PMD_SIZE);
1399 set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT);
1400
1401 set_ftrace_ops_ro();
1402
1403#ifdef CONFIG_CPA_DEBUG
1404 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
1405 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
1406
1407 printk(KERN_INFO "Testing CPA: again\n");
1408 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
1409#endif
1410
1411 free_kernel_image_pages("unused kernel image (text/rodata gap)",
1412 (void *)text_end, (void *)rodata_start);
1413 free_kernel_image_pages("unused kernel image (rodata/data gap)",
1414 (void *)rodata_end, (void *)_sdata);
1415
1416 debug_checkwx();
1417}
1418
1419/*
1420 * Block size is the minimum amount of memory which can be hotplugged or
1421 * hotremoved. It must be power of two and must be equal or larger than
1422 * MIN_MEMORY_BLOCK_SIZE.
1423 */
1424#define MAX_BLOCK_SIZE (2UL << 30)
1425
1426/* Amount of ram needed to start using large blocks */
1427#define MEM_SIZE_FOR_LARGE_BLOCK (64UL << 30)
1428
1429/* Adjustable memory block size */
1430static unsigned long set_memory_block_size;
1431int __init set_memory_block_size_order(unsigned int order)
1432{
1433 unsigned long size = 1UL << order;
1434
1435 if (size > MEM_SIZE_FOR_LARGE_BLOCK || size < MIN_MEMORY_BLOCK_SIZE)
1436 return -EINVAL;
1437
1438 set_memory_block_size = size;
1439 return 0;
1440}
1441
1442static unsigned long probe_memory_block_size(void)
1443{
1444 unsigned long boot_mem_end = max_pfn << PAGE_SHIFT;
1445 unsigned long bz;
1446
1447 /* If memory block size has been set, then use it */
1448 bz = set_memory_block_size;
1449 if (bz)
1450 goto done;
1451
1452 /* Use regular block if RAM is smaller than MEM_SIZE_FOR_LARGE_BLOCK */
1453 if (boot_mem_end < MEM_SIZE_FOR_LARGE_BLOCK) {
1454 bz = MIN_MEMORY_BLOCK_SIZE;
1455 goto done;
1456 }
1457
1458 /*
1459 * Use max block size to minimize overhead on bare metal, where
1460 * alignment for memory hotplug isn't a concern.
1461 */
1462 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
1463 bz = MAX_BLOCK_SIZE;
1464 goto done;
1465 }
1466
1467 /* Find the largest allowed block size that aligns to memory end */
1468 for (bz = MAX_BLOCK_SIZE; bz > MIN_MEMORY_BLOCK_SIZE; bz >>= 1) {
1469 if (IS_ALIGNED(boot_mem_end, bz))
1470 break;
1471 }
1472done:
1473 pr_info("x86/mm: Memory block size: %ldMB\n", bz >> 20);
1474
1475 return bz;
1476}
1477
1478static unsigned long memory_block_size_probed;
1479unsigned long memory_block_size_bytes(void)
1480{
1481 if (!memory_block_size_probed)
1482 memory_block_size_probed = probe_memory_block_size();
1483
1484 return memory_block_size_probed;
1485}
1486
1487#ifdef CONFIG_SPARSEMEM_VMEMMAP
1488/*
1489 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
1490 */
1491static long __meminitdata addr_start, addr_end;
1492static void __meminitdata *p_start, *p_end;
1493static int __meminitdata node_start;
1494
1495void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
1496 unsigned long addr, unsigned long next)
1497{
1498 pte_t entry;
1499
1500 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
1501 PAGE_KERNEL_LARGE);
1502 set_pmd(pmd, __pmd(pte_val(entry)));
1503
1504 /* check to see if we have contiguous blocks */
1505 if (p_end != p || node_start != node) {
1506 if (p_start)
1507 pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1508 addr_start, addr_end-1, p_start, p_end-1, node_start);
1509 addr_start = addr;
1510 node_start = node;
1511 p_start = p;
1512 }
1513
1514 addr_end = addr + PMD_SIZE;
1515 p_end = p + PMD_SIZE;
1516
1517 if (!IS_ALIGNED(addr, PMD_SIZE) ||
1518 !IS_ALIGNED(next, PMD_SIZE))
1519 vmemmap_use_new_sub_pmd(addr, next);
1520}
1521
1522int __meminit vmemmap_check_pmd(pmd_t *pmd, int node,
1523 unsigned long addr, unsigned long next)
1524{
1525 int large = pmd_large(*pmd);
1526
1527 if (pmd_large(*pmd)) {
1528 vmemmap_verify((pte_t *)pmd, node, addr, next);
1529 vmemmap_use_sub_pmd(addr, next);
1530 }
1531
1532 return large;
1533}
1534
1535int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
1536 struct vmem_altmap *altmap)
1537{
1538 int err;
1539
1540 VM_BUG_ON(!PAGE_ALIGNED(start));
1541 VM_BUG_ON(!PAGE_ALIGNED(end));
1542
1543 if (end - start < PAGES_PER_SECTION * sizeof(struct page))
1544 err = vmemmap_populate_basepages(start, end, node, NULL);
1545 else if (boot_cpu_has(X86_FEATURE_PSE))
1546 err = vmemmap_populate_hugepages(start, end, node, altmap);
1547 else if (altmap) {
1548 pr_err_once("%s: no cpu support for altmap allocations\n",
1549 __func__);
1550 err = -ENOMEM;
1551 } else
1552 err = vmemmap_populate_basepages(start, end, node, NULL);
1553 if (!err)
1554 sync_global_pgds(start, end - 1);
1555 return err;
1556}
1557
1558#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
1559void register_page_bootmem_memmap(unsigned long section_nr,
1560 struct page *start_page, unsigned long nr_pages)
1561{
1562 unsigned long addr = (unsigned long)start_page;
1563 unsigned long end = (unsigned long)(start_page + nr_pages);
1564 unsigned long next;
1565 pgd_t *pgd;
1566 p4d_t *p4d;
1567 pud_t *pud;
1568 pmd_t *pmd;
1569 unsigned int nr_pmd_pages;
1570 struct page *page;
1571
1572 for (; addr < end; addr = next) {
1573 pte_t *pte = NULL;
1574
1575 pgd = pgd_offset_k(addr);
1576 if (pgd_none(*pgd)) {
1577 next = (addr + PAGE_SIZE) & PAGE_MASK;
1578 continue;
1579 }
1580 get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
1581
1582 p4d = p4d_offset(pgd, addr);
1583 if (p4d_none(*p4d)) {
1584 next = (addr + PAGE_SIZE) & PAGE_MASK;
1585 continue;
1586 }
1587 get_page_bootmem(section_nr, p4d_page(*p4d), MIX_SECTION_INFO);
1588
1589 pud = pud_offset(p4d, addr);
1590 if (pud_none(*pud)) {
1591 next = (addr + PAGE_SIZE) & PAGE_MASK;
1592 continue;
1593 }
1594 get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
1595
1596 if (!boot_cpu_has(X86_FEATURE_PSE)) {
1597 next = (addr + PAGE_SIZE) & PAGE_MASK;
1598 pmd = pmd_offset(pud, addr);
1599 if (pmd_none(*pmd))
1600 continue;
1601 get_page_bootmem(section_nr, pmd_page(*pmd),
1602 MIX_SECTION_INFO);
1603
1604 pte = pte_offset_kernel(pmd, addr);
1605 if (pte_none(*pte))
1606 continue;
1607 get_page_bootmem(section_nr, pte_page(*pte),
1608 SECTION_INFO);
1609 } else {
1610 next = pmd_addr_end(addr, end);
1611
1612 pmd = pmd_offset(pud, addr);
1613 if (pmd_none(*pmd))
1614 continue;
1615
1616 nr_pmd_pages = 1 << get_order(PMD_SIZE);
1617 page = pmd_page(*pmd);
1618 while (nr_pmd_pages--)
1619 get_page_bootmem(section_nr, page++,
1620 SECTION_INFO);
1621 }
1622 }
1623}
1624#endif
1625
1626void __meminit vmemmap_populate_print_last(void)
1627{
1628 if (p_start) {
1629 pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1630 addr_start, addr_end-1, p_start, p_end-1, node_start);
1631 p_start = NULL;
1632 p_end = NULL;
1633 node_start = 0;
1634 }
1635}
1636#endif
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/x86_64/mm/init.c
4 *
5 * Copyright (C) 1995 Linus Torvalds
6 * Copyright (C) 2000 Pavel Machek <pavel@ucw.cz>
7 * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
8 */
9
10#include <linux/signal.h>
11#include <linux/sched.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/string.h>
15#include <linux/types.h>
16#include <linux/ptrace.h>
17#include <linux/mman.h>
18#include <linux/mm.h>
19#include <linux/swap.h>
20#include <linux/smp.h>
21#include <linux/init.h>
22#include <linux/initrd.h>
23#include <linux/pagemap.h>
24#include <linux/memblock.h>
25#include <linux/proc_fs.h>
26#include <linux/pci.h>
27#include <linux/pfn.h>
28#include <linux/poison.h>
29#include <linux/dma-mapping.h>
30#include <linux/memory.h>
31#include <linux/memory_hotplug.h>
32#include <linux/memremap.h>
33#include <linux/nmi.h>
34#include <linux/gfp.h>
35#include <linux/kcore.h>
36
37#include <asm/processor.h>
38#include <asm/bios_ebda.h>
39#include <linux/uaccess.h>
40#include <asm/pgalloc.h>
41#include <asm/dma.h>
42#include <asm/fixmap.h>
43#include <asm/e820/api.h>
44#include <asm/apic.h>
45#include <asm/tlb.h>
46#include <asm/mmu_context.h>
47#include <asm/proto.h>
48#include <asm/smp.h>
49#include <asm/sections.h>
50#include <asm/kdebug.h>
51#include <asm/numa.h>
52#include <asm/set_memory.h>
53#include <asm/init.h>
54#include <asm/uv/uv.h>
55#include <asm/setup.h>
56#include <asm/ftrace.h>
57
58#include "mm_internal.h"
59
60#include "ident_map.c"
61
62#define DEFINE_POPULATE(fname, type1, type2, init) \
63static inline void fname##_init(struct mm_struct *mm, \
64 type1##_t *arg1, type2##_t *arg2, bool init) \
65{ \
66 if (init) \
67 fname##_safe(mm, arg1, arg2); \
68 else \
69 fname(mm, arg1, arg2); \
70}
71
72DEFINE_POPULATE(p4d_populate, p4d, pud, init)
73DEFINE_POPULATE(pgd_populate, pgd, p4d, init)
74DEFINE_POPULATE(pud_populate, pud, pmd, init)
75DEFINE_POPULATE(pmd_populate_kernel, pmd, pte, init)
76
77#define DEFINE_ENTRY(type1, type2, init) \
78static inline void set_##type1##_init(type1##_t *arg1, \
79 type2##_t arg2, bool init) \
80{ \
81 if (init) \
82 set_##type1##_safe(arg1, arg2); \
83 else \
84 set_##type1(arg1, arg2); \
85}
86
87DEFINE_ENTRY(p4d, p4d, init)
88DEFINE_ENTRY(pud, pud, init)
89DEFINE_ENTRY(pmd, pmd, init)
90DEFINE_ENTRY(pte, pte, init)
91
92
93/*
94 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
95 * physical space so we can cache the place of the first one and move
96 * around without checking the pgd every time.
97 */
98
99/* Bits supported by the hardware: */
100pteval_t __supported_pte_mask __read_mostly = ~0;
101/* Bits allowed in normal kernel mappings: */
102pteval_t __default_kernel_pte_mask __read_mostly = ~0;
103EXPORT_SYMBOL_GPL(__supported_pte_mask);
104/* Used in PAGE_KERNEL_* macros which are reasonably used out-of-tree: */
105EXPORT_SYMBOL(__default_kernel_pte_mask);
106
107int force_personality32;
108
109/*
110 * noexec32=on|off
111 * Control non executable heap for 32bit processes.
112 * To control the stack too use noexec=off
113 *
114 * on PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
115 * off PROT_READ implies PROT_EXEC
116 */
117static int __init nonx32_setup(char *str)
118{
119 if (!strcmp(str, "on"))
120 force_personality32 &= ~READ_IMPLIES_EXEC;
121 else if (!strcmp(str, "off"))
122 force_personality32 |= READ_IMPLIES_EXEC;
123 return 1;
124}
125__setup("noexec32=", nonx32_setup);
126
127static void sync_global_pgds_l5(unsigned long start, unsigned long end)
128{
129 unsigned long addr;
130
131 for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
132 const pgd_t *pgd_ref = pgd_offset_k(addr);
133 struct page *page;
134
135 /* Check for overflow */
136 if (addr < start)
137 break;
138
139 if (pgd_none(*pgd_ref))
140 continue;
141
142 spin_lock(&pgd_lock);
143 list_for_each_entry(page, &pgd_list, lru) {
144 pgd_t *pgd;
145 spinlock_t *pgt_lock;
146
147 pgd = (pgd_t *)page_address(page) + pgd_index(addr);
148 /* the pgt_lock only for Xen */
149 pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
150 spin_lock(pgt_lock);
151
152 if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
153 BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
154
155 if (pgd_none(*pgd))
156 set_pgd(pgd, *pgd_ref);
157
158 spin_unlock(pgt_lock);
159 }
160 spin_unlock(&pgd_lock);
161 }
162}
163
164static void sync_global_pgds_l4(unsigned long start, unsigned long end)
165{
166 unsigned long addr;
167
168 for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
169 pgd_t *pgd_ref = pgd_offset_k(addr);
170 const p4d_t *p4d_ref;
171 struct page *page;
172
173 /*
174 * With folded p4d, pgd_none() is always false, we need to
175 * handle synchonization on p4d level.
176 */
177 MAYBE_BUILD_BUG_ON(pgd_none(*pgd_ref));
178 p4d_ref = p4d_offset(pgd_ref, addr);
179
180 if (p4d_none(*p4d_ref))
181 continue;
182
183 spin_lock(&pgd_lock);
184 list_for_each_entry(page, &pgd_list, lru) {
185 pgd_t *pgd;
186 p4d_t *p4d;
187 spinlock_t *pgt_lock;
188
189 pgd = (pgd_t *)page_address(page) + pgd_index(addr);
190 p4d = p4d_offset(pgd, addr);
191 /* the pgt_lock only for Xen */
192 pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
193 spin_lock(pgt_lock);
194
195 if (!p4d_none(*p4d_ref) && !p4d_none(*p4d))
196 BUG_ON(p4d_page_vaddr(*p4d)
197 != p4d_page_vaddr(*p4d_ref));
198
199 if (p4d_none(*p4d))
200 set_p4d(p4d, *p4d_ref);
201
202 spin_unlock(pgt_lock);
203 }
204 spin_unlock(&pgd_lock);
205 }
206}
207
208/*
209 * When memory was added make sure all the processes MM have
210 * suitable PGD entries in the local PGD level page.
211 */
212static void sync_global_pgds(unsigned long start, unsigned long end)
213{
214 if (pgtable_l5_enabled())
215 sync_global_pgds_l5(start, end);
216 else
217 sync_global_pgds_l4(start, end);
218}
219
220void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
221{
222 sync_global_pgds(start, end);
223}
224
225/*
226 * NOTE: This function is marked __ref because it calls __init function
227 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
228 */
229static __ref void *spp_getpage(void)
230{
231 void *ptr;
232
233 if (after_bootmem)
234 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
235 else
236 ptr = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
237
238 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
239 panic("set_pte_phys: cannot allocate page data %s\n",
240 after_bootmem ? "after bootmem" : "");
241 }
242
243 pr_debug("spp_getpage %p\n", ptr);
244
245 return ptr;
246}
247
248static p4d_t *fill_p4d(pgd_t *pgd, unsigned long vaddr)
249{
250 if (pgd_none(*pgd)) {
251 p4d_t *p4d = (p4d_t *)spp_getpage();
252 pgd_populate(&init_mm, pgd, p4d);
253 if (p4d != p4d_offset(pgd, 0))
254 printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
255 p4d, p4d_offset(pgd, 0));
256 }
257 return p4d_offset(pgd, vaddr);
258}
259
260static pud_t *fill_pud(p4d_t *p4d, unsigned long vaddr)
261{
262 if (p4d_none(*p4d)) {
263 pud_t *pud = (pud_t *)spp_getpage();
264 p4d_populate(&init_mm, p4d, pud);
265 if (pud != pud_offset(p4d, 0))
266 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
267 pud, pud_offset(p4d, 0));
268 }
269 return pud_offset(p4d, vaddr);
270}
271
272static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
273{
274 if (pud_none(*pud)) {
275 pmd_t *pmd = (pmd_t *) spp_getpage();
276 pud_populate(&init_mm, pud, pmd);
277 if (pmd != pmd_offset(pud, 0))
278 printk(KERN_ERR "PAGETABLE BUG #02! %p <-> %p\n",
279 pmd, pmd_offset(pud, 0));
280 }
281 return pmd_offset(pud, vaddr);
282}
283
284static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
285{
286 if (pmd_none(*pmd)) {
287 pte_t *pte = (pte_t *) spp_getpage();
288 pmd_populate_kernel(&init_mm, pmd, pte);
289 if (pte != pte_offset_kernel(pmd, 0))
290 printk(KERN_ERR "PAGETABLE BUG #03!\n");
291 }
292 return pte_offset_kernel(pmd, vaddr);
293}
294
295static void __set_pte_vaddr(pud_t *pud, unsigned long vaddr, pte_t new_pte)
296{
297 pmd_t *pmd = fill_pmd(pud, vaddr);
298 pte_t *pte = fill_pte(pmd, vaddr);
299
300 set_pte(pte, new_pte);
301
302 /*
303 * It's enough to flush this one mapping.
304 * (PGE mappings get flushed as well)
305 */
306 flush_tlb_one_kernel(vaddr);
307}
308
309void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte)
310{
311 p4d_t *p4d = p4d_page + p4d_index(vaddr);
312 pud_t *pud = fill_pud(p4d, vaddr);
313
314 __set_pte_vaddr(pud, vaddr, new_pte);
315}
316
317void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
318{
319 pud_t *pud = pud_page + pud_index(vaddr);
320
321 __set_pte_vaddr(pud, vaddr, new_pte);
322}
323
324void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
325{
326 pgd_t *pgd;
327 p4d_t *p4d_page;
328
329 pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
330
331 pgd = pgd_offset_k(vaddr);
332 if (pgd_none(*pgd)) {
333 printk(KERN_ERR
334 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
335 return;
336 }
337
338 p4d_page = p4d_offset(pgd, 0);
339 set_pte_vaddr_p4d(p4d_page, vaddr, pteval);
340}
341
342pmd_t * __init populate_extra_pmd(unsigned long vaddr)
343{
344 pgd_t *pgd;
345 p4d_t *p4d;
346 pud_t *pud;
347
348 pgd = pgd_offset_k(vaddr);
349 p4d = fill_p4d(pgd, vaddr);
350 pud = fill_pud(p4d, vaddr);
351 return fill_pmd(pud, vaddr);
352}
353
354pte_t * __init populate_extra_pte(unsigned long vaddr)
355{
356 pmd_t *pmd;
357
358 pmd = populate_extra_pmd(vaddr);
359 return fill_pte(pmd, vaddr);
360}
361
362/*
363 * Create large page table mappings for a range of physical addresses.
364 */
365static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
366 enum page_cache_mode cache)
367{
368 pgd_t *pgd;
369 p4d_t *p4d;
370 pud_t *pud;
371 pmd_t *pmd;
372 pgprot_t prot;
373
374 pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) |
375 protval_4k_2_large(cachemode2protval(cache));
376 BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
377 for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
378 pgd = pgd_offset_k((unsigned long)__va(phys));
379 if (pgd_none(*pgd)) {
380 p4d = (p4d_t *) spp_getpage();
381 set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE |
382 _PAGE_USER));
383 }
384 p4d = p4d_offset(pgd, (unsigned long)__va(phys));
385 if (p4d_none(*p4d)) {
386 pud = (pud_t *) spp_getpage();
387 set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE |
388 _PAGE_USER));
389 }
390 pud = pud_offset(p4d, (unsigned long)__va(phys));
391 if (pud_none(*pud)) {
392 pmd = (pmd_t *) spp_getpage();
393 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
394 _PAGE_USER));
395 }
396 pmd = pmd_offset(pud, phys);
397 BUG_ON(!pmd_none(*pmd));
398 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
399 }
400}
401
402void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
403{
404 __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB);
405}
406
407void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
408{
409 __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC);
410}
411
412/*
413 * The head.S code sets up the kernel high mapping:
414 *
415 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
416 *
417 * phys_base holds the negative offset to the kernel, which is added
418 * to the compile time generated pmds. This results in invalid pmds up
419 * to the point where we hit the physaddr 0 mapping.
420 *
421 * We limit the mappings to the region from _text to _brk_end. _brk_end
422 * is rounded up to the 2MB boundary. This catches the invalid pmds as
423 * well, as they are located before _text:
424 */
425void __init cleanup_highmap(void)
426{
427 unsigned long vaddr = __START_KERNEL_map;
428 unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;
429 unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
430 pmd_t *pmd = level2_kernel_pgt;
431
432 /*
433 * Native path, max_pfn_mapped is not set yet.
434 * Xen has valid max_pfn_mapped set in
435 * arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().
436 */
437 if (max_pfn_mapped)
438 vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
439
440 for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
441 if (pmd_none(*pmd))
442 continue;
443 if (vaddr < (unsigned long) _text || vaddr > end)
444 set_pmd(pmd, __pmd(0));
445 }
446}
447
448/*
449 * Create PTE level page table mapping for physical addresses.
450 * It returns the last physical address mapped.
451 */
452static unsigned long __meminit
453phys_pte_init(pte_t *pte_page, unsigned long paddr, unsigned long paddr_end,
454 pgprot_t prot, bool init)
455{
456 unsigned long pages = 0, paddr_next;
457 unsigned long paddr_last = paddr_end;
458 pte_t *pte;
459 int i;
460
461 pte = pte_page + pte_index(paddr);
462 i = pte_index(paddr);
463
464 for (; i < PTRS_PER_PTE; i++, paddr = paddr_next, pte++) {
465 paddr_next = (paddr & PAGE_MASK) + PAGE_SIZE;
466 if (paddr >= paddr_end) {
467 if (!after_bootmem &&
468 !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
469 E820_TYPE_RAM) &&
470 !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
471 E820_TYPE_RESERVED_KERN))
472 set_pte_init(pte, __pte(0), init);
473 continue;
474 }
475
476 /*
477 * We will re-use the existing mapping.
478 * Xen for example has some special requirements, like mapping
479 * pagetable pages as RO. So assume someone who pre-setup
480 * these mappings are more intelligent.
481 */
482 if (!pte_none(*pte)) {
483 if (!after_bootmem)
484 pages++;
485 continue;
486 }
487
488 if (0)
489 pr_info(" pte=%p addr=%lx pte=%016lx\n", pte, paddr,
490 pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL).pte);
491 pages++;
492 set_pte_init(pte, pfn_pte(paddr >> PAGE_SHIFT, prot), init);
493 paddr_last = (paddr & PAGE_MASK) + PAGE_SIZE;
494 }
495
496 update_page_count(PG_LEVEL_4K, pages);
497
498 return paddr_last;
499}
500
501/*
502 * Create PMD level page table mapping for physical addresses. The virtual
503 * and physical address have to be aligned at this level.
504 * It returns the last physical address mapped.
505 */
506static unsigned long __meminit
507phys_pmd_init(pmd_t *pmd_page, unsigned long paddr, unsigned long paddr_end,
508 unsigned long page_size_mask, pgprot_t prot, bool init)
509{
510 unsigned long pages = 0, paddr_next;
511 unsigned long paddr_last = paddr_end;
512
513 int i = pmd_index(paddr);
514
515 for (; i < PTRS_PER_PMD; i++, paddr = paddr_next) {
516 pmd_t *pmd = pmd_page + pmd_index(paddr);
517 pte_t *pte;
518 pgprot_t new_prot = prot;
519
520 paddr_next = (paddr & PMD_MASK) + PMD_SIZE;
521 if (paddr >= paddr_end) {
522 if (!after_bootmem &&
523 !e820__mapped_any(paddr & PMD_MASK, paddr_next,
524 E820_TYPE_RAM) &&
525 !e820__mapped_any(paddr & PMD_MASK, paddr_next,
526 E820_TYPE_RESERVED_KERN))
527 set_pmd_init(pmd, __pmd(0), init);
528 continue;
529 }
530
531 if (!pmd_none(*pmd)) {
532 if (!pmd_large(*pmd)) {
533 spin_lock(&init_mm.page_table_lock);
534 pte = (pte_t *)pmd_page_vaddr(*pmd);
535 paddr_last = phys_pte_init(pte, paddr,
536 paddr_end, prot,
537 init);
538 spin_unlock(&init_mm.page_table_lock);
539 continue;
540 }
541 /*
542 * If we are ok with PG_LEVEL_2M mapping, then we will
543 * use the existing mapping,
544 *
545 * Otherwise, we will split the large page mapping but
546 * use the same existing protection bits except for
547 * large page, so that we don't violate Intel's TLB
548 * Application note (317080) which says, while changing
549 * the page sizes, new and old translations should
550 * not differ with respect to page frame and
551 * attributes.
552 */
553 if (page_size_mask & (1 << PG_LEVEL_2M)) {
554 if (!after_bootmem)
555 pages++;
556 paddr_last = paddr_next;
557 continue;
558 }
559 new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
560 }
561
562 if (page_size_mask & (1<<PG_LEVEL_2M)) {
563 pages++;
564 spin_lock(&init_mm.page_table_lock);
565 set_pte_init((pte_t *)pmd,
566 pfn_pte((paddr & PMD_MASK) >> PAGE_SHIFT,
567 __pgprot(pgprot_val(prot) | _PAGE_PSE)),
568 init);
569 spin_unlock(&init_mm.page_table_lock);
570 paddr_last = paddr_next;
571 continue;
572 }
573
574 pte = alloc_low_page();
575 paddr_last = phys_pte_init(pte, paddr, paddr_end, new_prot, init);
576
577 spin_lock(&init_mm.page_table_lock);
578 pmd_populate_kernel_init(&init_mm, pmd, pte, init);
579 spin_unlock(&init_mm.page_table_lock);
580 }
581 update_page_count(PG_LEVEL_2M, pages);
582 return paddr_last;
583}
584
585/*
586 * Create PUD level page table mapping for physical addresses. The virtual
587 * and physical address do not have to be aligned at this level. KASLR can
588 * randomize virtual addresses up to this level.
589 * It returns the last physical address mapped.
590 */
591static unsigned long __meminit
592phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
593 unsigned long page_size_mask, pgprot_t _prot, bool init)
594{
595 unsigned long pages = 0, paddr_next;
596 unsigned long paddr_last = paddr_end;
597 unsigned long vaddr = (unsigned long)__va(paddr);
598 int i = pud_index(vaddr);
599
600 for (; i < PTRS_PER_PUD; i++, paddr = paddr_next) {
601 pud_t *pud;
602 pmd_t *pmd;
603 pgprot_t prot = _prot;
604
605 vaddr = (unsigned long)__va(paddr);
606 pud = pud_page + pud_index(vaddr);
607 paddr_next = (paddr & PUD_MASK) + PUD_SIZE;
608
609 if (paddr >= paddr_end) {
610 if (!after_bootmem &&
611 !e820__mapped_any(paddr & PUD_MASK, paddr_next,
612 E820_TYPE_RAM) &&
613 !e820__mapped_any(paddr & PUD_MASK, paddr_next,
614 E820_TYPE_RESERVED_KERN))
615 set_pud_init(pud, __pud(0), init);
616 continue;
617 }
618
619 if (!pud_none(*pud)) {
620 if (!pud_large(*pud)) {
621 pmd = pmd_offset(pud, 0);
622 paddr_last = phys_pmd_init(pmd, paddr,
623 paddr_end,
624 page_size_mask,
625 prot, init);
626 continue;
627 }
628 /*
629 * If we are ok with PG_LEVEL_1G mapping, then we will
630 * use the existing mapping.
631 *
632 * Otherwise, we will split the gbpage mapping but use
633 * the same existing protection bits except for large
634 * page, so that we don't violate Intel's TLB
635 * Application note (317080) which says, while changing
636 * the page sizes, new and old translations should
637 * not differ with respect to page frame and
638 * attributes.
639 */
640 if (page_size_mask & (1 << PG_LEVEL_1G)) {
641 if (!after_bootmem)
642 pages++;
643 paddr_last = paddr_next;
644 continue;
645 }
646 prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
647 }
648
649 if (page_size_mask & (1<<PG_LEVEL_1G)) {
650 pages++;
651 spin_lock(&init_mm.page_table_lock);
652
653 prot = __pgprot(pgprot_val(prot) | __PAGE_KERNEL_LARGE);
654
655 set_pte_init((pte_t *)pud,
656 pfn_pte((paddr & PUD_MASK) >> PAGE_SHIFT,
657 prot),
658 init);
659 spin_unlock(&init_mm.page_table_lock);
660 paddr_last = paddr_next;
661 continue;
662 }
663
664 pmd = alloc_low_page();
665 paddr_last = phys_pmd_init(pmd, paddr, paddr_end,
666 page_size_mask, prot, init);
667
668 spin_lock(&init_mm.page_table_lock);
669 pud_populate_init(&init_mm, pud, pmd, init);
670 spin_unlock(&init_mm.page_table_lock);
671 }
672
673 update_page_count(PG_LEVEL_1G, pages);
674
675 return paddr_last;
676}
677
678static unsigned long __meminit
679phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end,
680 unsigned long page_size_mask, pgprot_t prot, bool init)
681{
682 unsigned long vaddr, vaddr_end, vaddr_next, paddr_next, paddr_last;
683
684 paddr_last = paddr_end;
685 vaddr = (unsigned long)__va(paddr);
686 vaddr_end = (unsigned long)__va(paddr_end);
687
688 if (!pgtable_l5_enabled())
689 return phys_pud_init((pud_t *) p4d_page, paddr, paddr_end,
690 page_size_mask, prot, init);
691
692 for (; vaddr < vaddr_end; vaddr = vaddr_next) {
693 p4d_t *p4d = p4d_page + p4d_index(vaddr);
694 pud_t *pud;
695
696 vaddr_next = (vaddr & P4D_MASK) + P4D_SIZE;
697 paddr = __pa(vaddr);
698
699 if (paddr >= paddr_end) {
700 paddr_next = __pa(vaddr_next);
701 if (!after_bootmem &&
702 !e820__mapped_any(paddr & P4D_MASK, paddr_next,
703 E820_TYPE_RAM) &&
704 !e820__mapped_any(paddr & P4D_MASK, paddr_next,
705 E820_TYPE_RESERVED_KERN))
706 set_p4d_init(p4d, __p4d(0), init);
707 continue;
708 }
709
710 if (!p4d_none(*p4d)) {
711 pud = pud_offset(p4d, 0);
712 paddr_last = phys_pud_init(pud, paddr, __pa(vaddr_end),
713 page_size_mask, prot, init);
714 continue;
715 }
716
717 pud = alloc_low_page();
718 paddr_last = phys_pud_init(pud, paddr, __pa(vaddr_end),
719 page_size_mask, prot, init);
720
721 spin_lock(&init_mm.page_table_lock);
722 p4d_populate_init(&init_mm, p4d, pud, init);
723 spin_unlock(&init_mm.page_table_lock);
724 }
725
726 return paddr_last;
727}
728
729static unsigned long __meminit
730__kernel_physical_mapping_init(unsigned long paddr_start,
731 unsigned long paddr_end,
732 unsigned long page_size_mask,
733 pgprot_t prot, bool init)
734{
735 bool pgd_changed = false;
736 unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last;
737
738 paddr_last = paddr_end;
739 vaddr = (unsigned long)__va(paddr_start);
740 vaddr_end = (unsigned long)__va(paddr_end);
741 vaddr_start = vaddr;
742
743 for (; vaddr < vaddr_end; vaddr = vaddr_next) {
744 pgd_t *pgd = pgd_offset_k(vaddr);
745 p4d_t *p4d;
746
747 vaddr_next = (vaddr & PGDIR_MASK) + PGDIR_SIZE;
748
749 if (pgd_val(*pgd)) {
750 p4d = (p4d_t *)pgd_page_vaddr(*pgd);
751 paddr_last = phys_p4d_init(p4d, __pa(vaddr),
752 __pa(vaddr_end),
753 page_size_mask,
754 prot, init);
755 continue;
756 }
757
758 p4d = alloc_low_page();
759 paddr_last = phys_p4d_init(p4d, __pa(vaddr), __pa(vaddr_end),
760 page_size_mask, prot, init);
761
762 spin_lock(&init_mm.page_table_lock);
763 if (pgtable_l5_enabled())
764 pgd_populate_init(&init_mm, pgd, p4d, init);
765 else
766 p4d_populate_init(&init_mm, p4d_offset(pgd, vaddr),
767 (pud_t *) p4d, init);
768
769 spin_unlock(&init_mm.page_table_lock);
770 pgd_changed = true;
771 }
772
773 if (pgd_changed)
774 sync_global_pgds(vaddr_start, vaddr_end - 1);
775
776 return paddr_last;
777}
778
779
780/*
781 * Create page table mapping for the physical memory for specific physical
782 * addresses. Note that it can only be used to populate non-present entries.
783 * The virtual and physical addresses have to be aligned on PMD level
784 * down. It returns the last physical address mapped.
785 */
786unsigned long __meminit
787kernel_physical_mapping_init(unsigned long paddr_start,
788 unsigned long paddr_end,
789 unsigned long page_size_mask, pgprot_t prot)
790{
791 return __kernel_physical_mapping_init(paddr_start, paddr_end,
792 page_size_mask, prot, true);
793}
794
795/*
796 * This function is similar to kernel_physical_mapping_init() above with the
797 * exception that it uses set_{pud,pmd}() instead of the set_{pud,pte}_safe()
798 * when updating the mapping. The caller is responsible to flush the TLBs after
799 * the function returns.
800 */
801unsigned long __meminit
802kernel_physical_mapping_change(unsigned long paddr_start,
803 unsigned long paddr_end,
804 unsigned long page_size_mask)
805{
806 return __kernel_physical_mapping_init(paddr_start, paddr_end,
807 page_size_mask, PAGE_KERNEL,
808 false);
809}
810
811#ifndef CONFIG_NUMA
812void __init initmem_init(void)
813{
814 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
815}
816#endif
817
818void __init paging_init(void)
819{
820 sparse_init();
821
822 /*
823 * clear the default setting with node 0
824 * note: don't use nodes_clear here, that is really clearing when
825 * numa support is not compiled in, and later node_set_state
826 * will not set it back.
827 */
828 node_clear_state(0, N_MEMORY);
829 node_clear_state(0, N_NORMAL_MEMORY);
830
831 zone_sizes_init();
832}
833
834/*
835 * Memory hotplug specific functions
836 */
837#ifdef CONFIG_MEMORY_HOTPLUG
838/*
839 * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
840 * updating.
841 */
842static void update_end_of_memory_vars(u64 start, u64 size)
843{
844 unsigned long end_pfn = PFN_UP(start + size);
845
846 if (end_pfn > max_pfn) {
847 max_pfn = end_pfn;
848 max_low_pfn = end_pfn;
849 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
850 }
851}
852
853int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
854 struct mhp_params *params)
855{
856 int ret;
857
858 ret = __add_pages(nid, start_pfn, nr_pages, params);
859 WARN_ON_ONCE(ret);
860
861 /* update max_pfn, max_low_pfn and high_memory */
862 update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
863 nr_pages << PAGE_SHIFT);
864
865 return ret;
866}
867
868int arch_add_memory(int nid, u64 start, u64 size,
869 struct mhp_params *params)
870{
871 unsigned long start_pfn = start >> PAGE_SHIFT;
872 unsigned long nr_pages = size >> PAGE_SHIFT;
873
874 init_memory_mapping(start, start + size, params->pgprot);
875
876 return add_pages(nid, start_pfn, nr_pages, params);
877}
878
879#define PAGE_INUSE 0xFD
880
881static void __meminit free_pagetable(struct page *page, int order)
882{
883 unsigned long magic;
884 unsigned int nr_pages = 1 << order;
885
886 /* bootmem page has reserved flag */
887 if (PageReserved(page)) {
888 __ClearPageReserved(page);
889
890 magic = (unsigned long)page->freelist;
891 if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
892 while (nr_pages--)
893 put_page_bootmem(page++);
894 } else
895 while (nr_pages--)
896 free_reserved_page(page++);
897 } else
898 free_pages((unsigned long)page_address(page), order);
899}
900
901static void __meminit free_hugepage_table(struct page *page,
902 struct vmem_altmap *altmap)
903{
904 if (altmap)
905 vmem_altmap_free(altmap, PMD_SIZE / PAGE_SIZE);
906 else
907 free_pagetable(page, get_order(PMD_SIZE));
908}
909
910static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
911{
912 pte_t *pte;
913 int i;
914
915 for (i = 0; i < PTRS_PER_PTE; i++) {
916 pte = pte_start + i;
917 if (!pte_none(*pte))
918 return;
919 }
920
921 /* free a pte talbe */
922 free_pagetable(pmd_page(*pmd), 0);
923 spin_lock(&init_mm.page_table_lock);
924 pmd_clear(pmd);
925 spin_unlock(&init_mm.page_table_lock);
926}
927
928static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
929{
930 pmd_t *pmd;
931 int i;
932
933 for (i = 0; i < PTRS_PER_PMD; i++) {
934 pmd = pmd_start + i;
935 if (!pmd_none(*pmd))
936 return;
937 }
938
939 /* free a pmd talbe */
940 free_pagetable(pud_page(*pud), 0);
941 spin_lock(&init_mm.page_table_lock);
942 pud_clear(pud);
943 spin_unlock(&init_mm.page_table_lock);
944}
945
946static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
947{
948 pud_t *pud;
949 int i;
950
951 for (i = 0; i < PTRS_PER_PUD; i++) {
952 pud = pud_start + i;
953 if (!pud_none(*pud))
954 return;
955 }
956
957 /* free a pud talbe */
958 free_pagetable(p4d_page(*p4d), 0);
959 spin_lock(&init_mm.page_table_lock);
960 p4d_clear(p4d);
961 spin_unlock(&init_mm.page_table_lock);
962}
963
964static void __meminit
965remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
966 bool direct)
967{
968 unsigned long next, pages = 0;
969 pte_t *pte;
970 void *page_addr;
971 phys_addr_t phys_addr;
972
973 pte = pte_start + pte_index(addr);
974 for (; addr < end; addr = next, pte++) {
975 next = (addr + PAGE_SIZE) & PAGE_MASK;
976 if (next > end)
977 next = end;
978
979 if (!pte_present(*pte))
980 continue;
981
982 /*
983 * We mapped [0,1G) memory as identity mapping when
984 * initializing, in arch/x86/kernel/head_64.S. These
985 * pagetables cannot be removed.
986 */
987 phys_addr = pte_val(*pte) + (addr & PAGE_MASK);
988 if (phys_addr < (phys_addr_t)0x40000000)
989 return;
990
991 if (PAGE_ALIGNED(addr) && PAGE_ALIGNED(next)) {
992 /*
993 * Do not free direct mapping pages since they were
994 * freed when offlining, or simplely not in use.
995 */
996 if (!direct)
997 free_pagetable(pte_page(*pte), 0);
998
999 spin_lock(&init_mm.page_table_lock);
1000 pte_clear(&init_mm, addr, pte);
1001 spin_unlock(&init_mm.page_table_lock);
1002
1003 /* For non-direct mapping, pages means nothing. */
1004 pages++;
1005 } else {
1006 /*
1007 * If we are here, we are freeing vmemmap pages since
1008 * direct mapped memory ranges to be freed are aligned.
1009 *
1010 * If we are not removing the whole page, it means
1011 * other page structs in this page are being used and
1012 * we canot remove them. So fill the unused page_structs
1013 * with 0xFD, and remove the page when it is wholly
1014 * filled with 0xFD.
1015 */
1016 memset((void *)addr, PAGE_INUSE, next - addr);
1017
1018 page_addr = page_address(pte_page(*pte));
1019 if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) {
1020 free_pagetable(pte_page(*pte), 0);
1021
1022 spin_lock(&init_mm.page_table_lock);
1023 pte_clear(&init_mm, addr, pte);
1024 spin_unlock(&init_mm.page_table_lock);
1025 }
1026 }
1027 }
1028
1029 /* Call free_pte_table() in remove_pmd_table(). */
1030 flush_tlb_all();
1031 if (direct)
1032 update_page_count(PG_LEVEL_4K, -pages);
1033}
1034
1035static void __meminit
1036remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
1037 bool direct, struct vmem_altmap *altmap)
1038{
1039 unsigned long next, pages = 0;
1040 pte_t *pte_base;
1041 pmd_t *pmd;
1042 void *page_addr;
1043
1044 pmd = pmd_start + pmd_index(addr);
1045 for (; addr < end; addr = next, pmd++) {
1046 next = pmd_addr_end(addr, end);
1047
1048 if (!pmd_present(*pmd))
1049 continue;
1050
1051 if (pmd_large(*pmd)) {
1052 if (IS_ALIGNED(addr, PMD_SIZE) &&
1053 IS_ALIGNED(next, PMD_SIZE)) {
1054 if (!direct)
1055 free_hugepage_table(pmd_page(*pmd),
1056 altmap);
1057
1058 spin_lock(&init_mm.page_table_lock);
1059 pmd_clear(pmd);
1060 spin_unlock(&init_mm.page_table_lock);
1061 pages++;
1062 } else {
1063 /* If here, we are freeing vmemmap pages. */
1064 memset((void *)addr, PAGE_INUSE, next - addr);
1065
1066 page_addr = page_address(pmd_page(*pmd));
1067 if (!memchr_inv(page_addr, PAGE_INUSE,
1068 PMD_SIZE)) {
1069 free_hugepage_table(pmd_page(*pmd),
1070 altmap);
1071
1072 spin_lock(&init_mm.page_table_lock);
1073 pmd_clear(pmd);
1074 spin_unlock(&init_mm.page_table_lock);
1075 }
1076 }
1077
1078 continue;
1079 }
1080
1081 pte_base = (pte_t *)pmd_page_vaddr(*pmd);
1082 remove_pte_table(pte_base, addr, next, direct);
1083 free_pte_table(pte_base, pmd);
1084 }
1085
1086 /* Call free_pmd_table() in remove_pud_table(). */
1087 if (direct)
1088 update_page_count(PG_LEVEL_2M, -pages);
1089}
1090
1091static void __meminit
1092remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
1093 struct vmem_altmap *altmap, bool direct)
1094{
1095 unsigned long next, pages = 0;
1096 pmd_t *pmd_base;
1097 pud_t *pud;
1098 void *page_addr;
1099
1100 pud = pud_start + pud_index(addr);
1101 for (; addr < end; addr = next, pud++) {
1102 next = pud_addr_end(addr, end);
1103
1104 if (!pud_present(*pud))
1105 continue;
1106
1107 if (pud_large(*pud)) {
1108 if (IS_ALIGNED(addr, PUD_SIZE) &&
1109 IS_ALIGNED(next, PUD_SIZE)) {
1110 if (!direct)
1111 free_pagetable(pud_page(*pud),
1112 get_order(PUD_SIZE));
1113
1114 spin_lock(&init_mm.page_table_lock);
1115 pud_clear(pud);
1116 spin_unlock(&init_mm.page_table_lock);
1117 pages++;
1118 } else {
1119 /* If here, we are freeing vmemmap pages. */
1120 memset((void *)addr, PAGE_INUSE, next - addr);
1121
1122 page_addr = page_address(pud_page(*pud));
1123 if (!memchr_inv(page_addr, PAGE_INUSE,
1124 PUD_SIZE)) {
1125 free_pagetable(pud_page(*pud),
1126 get_order(PUD_SIZE));
1127
1128 spin_lock(&init_mm.page_table_lock);
1129 pud_clear(pud);
1130 spin_unlock(&init_mm.page_table_lock);
1131 }
1132 }
1133
1134 continue;
1135 }
1136
1137 pmd_base = pmd_offset(pud, 0);
1138 remove_pmd_table(pmd_base, addr, next, direct, altmap);
1139 free_pmd_table(pmd_base, pud);
1140 }
1141
1142 if (direct)
1143 update_page_count(PG_LEVEL_1G, -pages);
1144}
1145
1146static void __meminit
1147remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
1148 struct vmem_altmap *altmap, bool direct)
1149{
1150 unsigned long next, pages = 0;
1151 pud_t *pud_base;
1152 p4d_t *p4d;
1153
1154 p4d = p4d_start + p4d_index(addr);
1155 for (; addr < end; addr = next, p4d++) {
1156 next = p4d_addr_end(addr, end);
1157
1158 if (!p4d_present(*p4d))
1159 continue;
1160
1161 BUILD_BUG_ON(p4d_large(*p4d));
1162
1163 pud_base = pud_offset(p4d, 0);
1164 remove_pud_table(pud_base, addr, next, altmap, direct);
1165 /*
1166 * For 4-level page tables we do not want to free PUDs, but in the
1167 * 5-level case we should free them. This code will have to change
1168 * to adapt for boot-time switching between 4 and 5 level page tables.
1169 */
1170 if (pgtable_l5_enabled())
1171 free_pud_table(pud_base, p4d);
1172 }
1173
1174 if (direct)
1175 update_page_count(PG_LEVEL_512G, -pages);
1176}
1177
1178/* start and end are both virtual address. */
1179static void __meminit
1180remove_pagetable(unsigned long start, unsigned long end, bool direct,
1181 struct vmem_altmap *altmap)
1182{
1183 unsigned long next;
1184 unsigned long addr;
1185 pgd_t *pgd;
1186 p4d_t *p4d;
1187
1188 for (addr = start; addr < end; addr = next) {
1189 next = pgd_addr_end(addr, end);
1190
1191 pgd = pgd_offset_k(addr);
1192 if (!pgd_present(*pgd))
1193 continue;
1194
1195 p4d = p4d_offset(pgd, 0);
1196 remove_p4d_table(p4d, addr, next, altmap, direct);
1197 }
1198
1199 flush_tlb_all();
1200}
1201
1202void __ref vmemmap_free(unsigned long start, unsigned long end,
1203 struct vmem_altmap *altmap)
1204{
1205 remove_pagetable(start, end, false, altmap);
1206}
1207
1208static void __meminit
1209kernel_physical_mapping_remove(unsigned long start, unsigned long end)
1210{
1211 start = (unsigned long)__va(start);
1212 end = (unsigned long)__va(end);
1213
1214 remove_pagetable(start, end, true, NULL);
1215}
1216
1217void __ref arch_remove_memory(int nid, u64 start, u64 size,
1218 struct vmem_altmap *altmap)
1219{
1220 unsigned long start_pfn = start >> PAGE_SHIFT;
1221 unsigned long nr_pages = size >> PAGE_SHIFT;
1222
1223 __remove_pages(start_pfn, nr_pages, altmap);
1224 kernel_physical_mapping_remove(start, start + size);
1225}
1226#endif /* CONFIG_MEMORY_HOTPLUG */
1227
1228static struct kcore_list kcore_vsyscall;
1229
1230static void __init register_page_bootmem_info(void)
1231{
1232#ifdef CONFIG_NUMA
1233 int i;
1234
1235 for_each_online_node(i)
1236 register_page_bootmem_info_node(NODE_DATA(i));
1237#endif
1238}
1239
1240/*
1241 * Pre-allocates page-table pages for the vmalloc area in the kernel page-table.
1242 * Only the level which needs to be synchronized between all page-tables is
1243 * allocated because the synchronization can be expensive.
1244 */
1245static void __init preallocate_vmalloc_pages(void)
1246{
1247 unsigned long addr;
1248 const char *lvl;
1249
1250 for (addr = VMALLOC_START; addr <= VMALLOC_END; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
1251 pgd_t *pgd = pgd_offset_k(addr);
1252 p4d_t *p4d;
1253 pud_t *pud;
1254
1255 lvl = "p4d";
1256 p4d = p4d_alloc(&init_mm, pgd, addr);
1257 if (!p4d)
1258 goto failed;
1259
1260 /*
1261 * With 5-level paging the P4D level is not folded. So the PGDs
1262 * are now populated and there is no need to walk down to the
1263 * PUD level.
1264 */
1265 if (pgtable_l5_enabled())
1266 continue;
1267
1268 lvl = "pud";
1269 pud = pud_alloc(&init_mm, p4d, addr);
1270 if (!pud)
1271 goto failed;
1272 }
1273
1274 return;
1275
1276failed:
1277
1278 /*
1279 * The pages have to be there now or they will be missing in
1280 * process page-tables later.
1281 */
1282 panic("Failed to pre-allocate %s pages for vmalloc area\n", lvl);
1283}
1284
1285void __init mem_init(void)
1286{
1287 pci_iommu_alloc();
1288
1289 /* clear_bss() already clear the empty_zero_page */
1290
1291 /* this will put all memory onto the freelists */
1292 memblock_free_all();
1293 after_bootmem = 1;
1294 x86_init.hyper.init_after_bootmem();
1295
1296 /*
1297 * Must be done after boot memory is put on freelist, because here we
1298 * might set fields in deferred struct pages that have not yet been
1299 * initialized, and memblock_free_all() initializes all the reserved
1300 * deferred pages for us.
1301 */
1302 register_page_bootmem_info();
1303
1304 /* Register memory areas for /proc/kcore */
1305 if (get_gate_vma(&init_mm))
1306 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, PAGE_SIZE, KCORE_USER);
1307
1308 preallocate_vmalloc_pages();
1309
1310 mem_init_print_info(NULL);
1311}
1312
1313#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
1314int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask)
1315{
1316 /*
1317 * More CPUs always led to greater speedups on tested systems, up to
1318 * all the nodes' CPUs. Use all since the system is otherwise idle
1319 * now.
1320 */
1321 return max_t(int, cpumask_weight(node_cpumask), 1);
1322}
1323#endif
1324
1325int kernel_set_to_readonly;
1326
1327void mark_rodata_ro(void)
1328{
1329 unsigned long start = PFN_ALIGN(_text);
1330 unsigned long rodata_start = PFN_ALIGN(__start_rodata);
1331 unsigned long end = (unsigned long)__end_rodata_hpage_align;
1332 unsigned long text_end = PFN_ALIGN(_etext);
1333 unsigned long rodata_end = PFN_ALIGN(__end_rodata);
1334 unsigned long all_end;
1335
1336 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
1337 (end - start) >> 10);
1338 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
1339
1340 kernel_set_to_readonly = 1;
1341
1342 /*
1343 * The rodata/data/bss/brk section (but not the kernel text!)
1344 * should also be not-executable.
1345 *
1346 * We align all_end to PMD_SIZE because the existing mapping
1347 * is a full PMD. If we would align _brk_end to PAGE_SIZE we
1348 * split the PMD and the reminder between _brk_end and the end
1349 * of the PMD will remain mapped executable.
1350 *
1351 * Any PMD which was setup after the one which covers _brk_end
1352 * has been zapped already via cleanup_highmem().
1353 */
1354 all_end = roundup((unsigned long)_brk_end, PMD_SIZE);
1355 set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT);
1356
1357 set_ftrace_ops_ro();
1358
1359#ifdef CONFIG_CPA_DEBUG
1360 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
1361 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
1362
1363 printk(KERN_INFO "Testing CPA: again\n");
1364 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
1365#endif
1366
1367 free_kernel_image_pages("unused kernel image (text/rodata gap)",
1368 (void *)text_end, (void *)rodata_start);
1369 free_kernel_image_pages("unused kernel image (rodata/data gap)",
1370 (void *)rodata_end, (void *)_sdata);
1371
1372 debug_checkwx();
1373}
1374
1375int kern_addr_valid(unsigned long addr)
1376{
1377 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
1378 pgd_t *pgd;
1379 p4d_t *p4d;
1380 pud_t *pud;
1381 pmd_t *pmd;
1382 pte_t *pte;
1383
1384 if (above != 0 && above != -1UL)
1385 return 0;
1386
1387 pgd = pgd_offset_k(addr);
1388 if (pgd_none(*pgd))
1389 return 0;
1390
1391 p4d = p4d_offset(pgd, addr);
1392 if (p4d_none(*p4d))
1393 return 0;
1394
1395 pud = pud_offset(p4d, addr);
1396 if (pud_none(*pud))
1397 return 0;
1398
1399 if (pud_large(*pud))
1400 return pfn_valid(pud_pfn(*pud));
1401
1402 pmd = pmd_offset(pud, addr);
1403 if (pmd_none(*pmd))
1404 return 0;
1405
1406 if (pmd_large(*pmd))
1407 return pfn_valid(pmd_pfn(*pmd));
1408
1409 pte = pte_offset_kernel(pmd, addr);
1410 if (pte_none(*pte))
1411 return 0;
1412
1413 return pfn_valid(pte_pfn(*pte));
1414}
1415
1416/*
1417 * Block size is the minimum amount of memory which can be hotplugged or
1418 * hotremoved. It must be power of two and must be equal or larger than
1419 * MIN_MEMORY_BLOCK_SIZE.
1420 */
1421#define MAX_BLOCK_SIZE (2UL << 30)
1422
1423/* Amount of ram needed to start using large blocks */
1424#define MEM_SIZE_FOR_LARGE_BLOCK (64UL << 30)
1425
1426/* Adjustable memory block size */
1427static unsigned long set_memory_block_size;
1428int __init set_memory_block_size_order(unsigned int order)
1429{
1430 unsigned long size = 1UL << order;
1431
1432 if (size > MEM_SIZE_FOR_LARGE_BLOCK || size < MIN_MEMORY_BLOCK_SIZE)
1433 return -EINVAL;
1434
1435 set_memory_block_size = size;
1436 return 0;
1437}
1438
1439static unsigned long probe_memory_block_size(void)
1440{
1441 unsigned long boot_mem_end = max_pfn << PAGE_SHIFT;
1442 unsigned long bz;
1443
1444 /* If memory block size has been set, then use it */
1445 bz = set_memory_block_size;
1446 if (bz)
1447 goto done;
1448
1449 /* Use regular block if RAM is smaller than MEM_SIZE_FOR_LARGE_BLOCK */
1450 if (boot_mem_end < MEM_SIZE_FOR_LARGE_BLOCK) {
1451 bz = MIN_MEMORY_BLOCK_SIZE;
1452 goto done;
1453 }
1454
1455 /*
1456 * Use max block size to minimize overhead on bare metal, where
1457 * alignment for memory hotplug isn't a concern.
1458 */
1459 if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
1460 bz = MAX_BLOCK_SIZE;
1461 goto done;
1462 }
1463
1464 /* Find the largest allowed block size that aligns to memory end */
1465 for (bz = MAX_BLOCK_SIZE; bz > MIN_MEMORY_BLOCK_SIZE; bz >>= 1) {
1466 if (IS_ALIGNED(boot_mem_end, bz))
1467 break;
1468 }
1469done:
1470 pr_info("x86/mm: Memory block size: %ldMB\n", bz >> 20);
1471
1472 return bz;
1473}
1474
1475static unsigned long memory_block_size_probed;
1476unsigned long memory_block_size_bytes(void)
1477{
1478 if (!memory_block_size_probed)
1479 memory_block_size_probed = probe_memory_block_size();
1480
1481 return memory_block_size_probed;
1482}
1483
1484#ifdef CONFIG_SPARSEMEM_VMEMMAP
1485/*
1486 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
1487 */
1488static long __meminitdata addr_start, addr_end;
1489static void __meminitdata *p_start, *p_end;
1490static int __meminitdata node_start;
1491
1492static int __meminit vmemmap_populate_hugepages(unsigned long start,
1493 unsigned long end, int node, struct vmem_altmap *altmap)
1494{
1495 unsigned long addr;
1496 unsigned long next;
1497 pgd_t *pgd;
1498 p4d_t *p4d;
1499 pud_t *pud;
1500 pmd_t *pmd;
1501
1502 for (addr = start; addr < end; addr = next) {
1503 next = pmd_addr_end(addr, end);
1504
1505 pgd = vmemmap_pgd_populate(addr, node);
1506 if (!pgd)
1507 return -ENOMEM;
1508
1509 p4d = vmemmap_p4d_populate(pgd, addr, node);
1510 if (!p4d)
1511 return -ENOMEM;
1512
1513 pud = vmemmap_pud_populate(p4d, addr, node);
1514 if (!pud)
1515 return -ENOMEM;
1516
1517 pmd = pmd_offset(pud, addr);
1518 if (pmd_none(*pmd)) {
1519 void *p;
1520
1521 p = vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
1522 if (p) {
1523 pte_t entry;
1524
1525 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
1526 PAGE_KERNEL_LARGE);
1527 set_pmd(pmd, __pmd(pte_val(entry)));
1528
1529 /* check to see if we have contiguous blocks */
1530 if (p_end != p || node_start != node) {
1531 if (p_start)
1532 pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1533 addr_start, addr_end-1, p_start, p_end-1, node_start);
1534 addr_start = addr;
1535 node_start = node;
1536 p_start = p;
1537 }
1538
1539 addr_end = addr + PMD_SIZE;
1540 p_end = p + PMD_SIZE;
1541 continue;
1542 } else if (altmap)
1543 return -ENOMEM; /* no fallback */
1544 } else if (pmd_large(*pmd)) {
1545 vmemmap_verify((pte_t *)pmd, node, addr, next);
1546 continue;
1547 }
1548 if (vmemmap_populate_basepages(addr, next, node, NULL))
1549 return -ENOMEM;
1550 }
1551 return 0;
1552}
1553
1554int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
1555 struct vmem_altmap *altmap)
1556{
1557 int err;
1558
1559 if (end - start < PAGES_PER_SECTION * sizeof(struct page))
1560 err = vmemmap_populate_basepages(start, end, node, NULL);
1561 else if (boot_cpu_has(X86_FEATURE_PSE))
1562 err = vmemmap_populate_hugepages(start, end, node, altmap);
1563 else if (altmap) {
1564 pr_err_once("%s: no cpu support for altmap allocations\n",
1565 __func__);
1566 err = -ENOMEM;
1567 } else
1568 err = vmemmap_populate_basepages(start, end, node, NULL);
1569 if (!err)
1570 sync_global_pgds(start, end - 1);
1571 return err;
1572}
1573
1574#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)
1575void register_page_bootmem_memmap(unsigned long section_nr,
1576 struct page *start_page, unsigned long nr_pages)
1577{
1578 unsigned long addr = (unsigned long)start_page;
1579 unsigned long end = (unsigned long)(start_page + nr_pages);
1580 unsigned long next;
1581 pgd_t *pgd;
1582 p4d_t *p4d;
1583 pud_t *pud;
1584 pmd_t *pmd;
1585 unsigned int nr_pmd_pages;
1586 struct page *page;
1587
1588 for (; addr < end; addr = next) {
1589 pte_t *pte = NULL;
1590
1591 pgd = pgd_offset_k(addr);
1592 if (pgd_none(*pgd)) {
1593 next = (addr + PAGE_SIZE) & PAGE_MASK;
1594 continue;
1595 }
1596 get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
1597
1598 p4d = p4d_offset(pgd, addr);
1599 if (p4d_none(*p4d)) {
1600 next = (addr + PAGE_SIZE) & PAGE_MASK;
1601 continue;
1602 }
1603 get_page_bootmem(section_nr, p4d_page(*p4d), MIX_SECTION_INFO);
1604
1605 pud = pud_offset(p4d, addr);
1606 if (pud_none(*pud)) {
1607 next = (addr + PAGE_SIZE) & PAGE_MASK;
1608 continue;
1609 }
1610 get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
1611
1612 if (!boot_cpu_has(X86_FEATURE_PSE)) {
1613 next = (addr + PAGE_SIZE) & PAGE_MASK;
1614 pmd = pmd_offset(pud, addr);
1615 if (pmd_none(*pmd))
1616 continue;
1617 get_page_bootmem(section_nr, pmd_page(*pmd),
1618 MIX_SECTION_INFO);
1619
1620 pte = pte_offset_kernel(pmd, addr);
1621 if (pte_none(*pte))
1622 continue;
1623 get_page_bootmem(section_nr, pte_page(*pte),
1624 SECTION_INFO);
1625 } else {
1626 next = pmd_addr_end(addr, end);
1627
1628 pmd = pmd_offset(pud, addr);
1629 if (pmd_none(*pmd))
1630 continue;
1631
1632 nr_pmd_pages = 1 << get_order(PMD_SIZE);
1633 page = pmd_page(*pmd);
1634 while (nr_pmd_pages--)
1635 get_page_bootmem(section_nr, page++,
1636 SECTION_INFO);
1637 }
1638 }
1639}
1640#endif
1641
1642void __meminit vmemmap_populate_print_last(void)
1643{
1644 if (p_start) {
1645 pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1646 addr_start, addr_end-1, p_start, p_end-1, node_start);
1647 p_start = NULL;
1648 p_end = NULL;
1649 node_start = 0;
1650 }
1651}
1652#endif