1
2
3
4
5
6#include <linux/highmem.h>
7#include <linux/memblock.h>
8#include <linux/sched.h>
9#include <linux/mm.h>
10#include <linux/interrupt.h>
11#include <linux/seq_file.h>
12#include <linux/debugfs.h>
13#include <linux/pfn.h>
14#include <linux/percpu.h>
15#include <linux/gfp.h>
16#include <linux/pci.h>
17#include <linux/vmalloc.h>
18
19#include <asm/e820/api.h>
20#include <asm/processor.h>
21#include <asm/tlbflush.h>
22#include <asm/sections.h>
23#include <asm/setup.h>
24#include <linux/uaccess.h>
25#include <asm/pgalloc.h>
26#include <asm/proto.h>
27#include <asm/pat.h>
28#include <asm/set_memory.h>
29
30#include "mm_internal.h"
31
32
33
34
35struct cpa_data {
36 unsigned long *vaddr;
37 pgd_t *pgd;
38 pgprot_t mask_set;
39 pgprot_t mask_clr;
40 unsigned long numpages;
41 unsigned long curpage;
42 unsigned long pfn;
43 unsigned int flags;
44 unsigned int force_split : 1,
45 force_static_prot : 1;
46 struct page **pages;
47};
48
49enum cpa_warn {
50 CPA_CONFLICT,
51 CPA_PROTECT,
52 CPA_DETECT,
53};
54
55static const int cpa_warn_level = CPA_PROTECT;
56
57
58
59
60
61
62
63static DEFINE_SPINLOCK(cpa_lock);
64
65#define CPA_FLUSHTLB 1
66#define CPA_ARRAY 2
67#define CPA_PAGES_ARRAY 4
68#define CPA_NO_CHECK_ALIAS 8
69
70#ifdef CONFIG_PROC_FS
71static unsigned long direct_pages_count[PG_LEVEL_NUM];
72
73void update_page_count(int level, unsigned long pages)
74{
75
76 spin_lock(&pgd_lock);
77 direct_pages_count[level] += pages;
78 spin_unlock(&pgd_lock);
79}
80
81static void split_page_count(int level)
82{
83 if (direct_pages_count[level] == 0)
84 return;
85
86 direct_pages_count[level]--;
87 direct_pages_count[level - 1] += PTRS_PER_PTE;
88}
89
90void arch_report_meminfo(struct seq_file *m)
91{
92 seq_printf(m, "DirectMap4k: %8lu kB\n",
93 direct_pages_count[PG_LEVEL_4K] << 2);
94#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
95 seq_printf(m, "DirectMap2M: %8lu kB\n",
96 direct_pages_count[PG_LEVEL_2M] << 11);
97#else
98 seq_printf(m, "DirectMap4M: %8lu kB\n",
99 direct_pages_count[PG_LEVEL_2M] << 12);
100#endif
101 if (direct_gbpages)
102 seq_printf(m, "DirectMap1G: %8lu kB\n",
103 direct_pages_count[PG_LEVEL_1G] << 20);
104}
105#else
106static inline void split_page_count(int level) { }
107#endif
108
109#ifdef CONFIG_X86_CPA_STATISTICS
110
111static unsigned long cpa_1g_checked;
112static unsigned long cpa_1g_sameprot;
113static unsigned long cpa_1g_preserved;
114static unsigned long cpa_2m_checked;
115static unsigned long cpa_2m_sameprot;
116static unsigned long cpa_2m_preserved;
117static unsigned long cpa_4k_install;
118
119static inline void cpa_inc_1g_checked(void)
120{
121 cpa_1g_checked++;
122}
123
124static inline void cpa_inc_2m_checked(void)
125{
126 cpa_2m_checked++;
127}
128
129static inline void cpa_inc_4k_install(void)
130{
131 cpa_4k_install++;
132}
133
134static inline void cpa_inc_lp_sameprot(int level)
135{
136 if (level == PG_LEVEL_1G)
137 cpa_1g_sameprot++;
138 else
139 cpa_2m_sameprot++;
140}
141
142static inline void cpa_inc_lp_preserved(int level)
143{
144 if (level == PG_LEVEL_1G)
145 cpa_1g_preserved++;
146 else
147 cpa_2m_preserved++;
148}
149
150static int cpastats_show(struct seq_file *m, void *p)
151{
152 seq_printf(m, "1G pages checked: %16lu\n", cpa_1g_checked);
153 seq_printf(m, "1G pages sameprot: %16lu\n", cpa_1g_sameprot);
154 seq_printf(m, "1G pages preserved: %16lu\n", cpa_1g_preserved);
155 seq_printf(m, "2M pages checked: %16lu\n", cpa_2m_checked);
156 seq_printf(m, "2M pages sameprot: %16lu\n", cpa_2m_sameprot);
157 seq_printf(m, "2M pages preserved: %16lu\n", cpa_2m_preserved);
158 seq_printf(m, "4K pages set-checked: %16lu\n", cpa_4k_install);
159 return 0;
160}
161
162static int cpastats_open(struct inode *inode, struct file *file)
163{
164 return single_open(file, cpastats_show, NULL);
165}
166
167static const struct file_operations cpastats_fops = {
168 .open = cpastats_open,
169 .read = seq_read,
170 .llseek = seq_lseek,
171 .release = single_release,
172};
173
174static int __init cpa_stats_init(void)
175{
176 debugfs_create_file("cpa_stats", S_IRUSR, arch_debugfs_dir, NULL,
177 &cpastats_fops);
178 return 0;
179}
180late_initcall(cpa_stats_init);
181#else
182static inline void cpa_inc_1g_checked(void) { }
183static inline void cpa_inc_2m_checked(void) { }
184static inline void cpa_inc_4k_install(void) { }
185static inline void cpa_inc_lp_sameprot(int level) { }
186static inline void cpa_inc_lp_preserved(int level) { }
187#endif
188
189
190static inline int
191within(unsigned long addr, unsigned long start, unsigned long end)
192{
193 return addr >= start && addr < end;
194}
195
196static inline int
197within_inclusive(unsigned long addr, unsigned long start, unsigned long end)
198{
199 return addr >= start && addr <= end;
200}
201
202#ifdef CONFIG_X86_64
203
204static inline unsigned long highmap_start_pfn(void)
205{
206 return __pa_symbol(_text) >> PAGE_SHIFT;
207}
208
209static inline unsigned long highmap_end_pfn(void)
210{
211
212 return __pa_symbol(roundup(_brk_end, PMD_SIZE) - 1) >> PAGE_SHIFT;
213}
214
215static bool __cpa_pfn_in_highmap(unsigned long pfn)
216{
217
218
219
220
221 return within_inclusive(pfn, highmap_start_pfn(), highmap_end_pfn());
222}
223
224#else
225
226static bool __cpa_pfn_in_highmap(unsigned long pfn)
227{
228
229 return false;
230}
231
232#endif
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248static inline unsigned long fix_addr(unsigned long addr)
249{
250#ifdef CONFIG_X86_64
251 return (long)(addr << 1) >> 1;
252#else
253 return addr;
254#endif
255}
256
257static unsigned long __cpa_addr(struct cpa_data *cpa, unsigned long idx)
258{
259 if (cpa->flags & CPA_PAGES_ARRAY) {
260 struct page *page = cpa->pages[idx];
261
262 if (unlikely(PageHighMem(page)))
263 return 0;
264
265 return (unsigned long)page_address(page);
266 }
267
268 if (cpa->flags & CPA_ARRAY)
269 return cpa->vaddr[idx];
270
271 return *cpa->vaddr + idx * PAGE_SIZE;
272}
273
274
275
276
277
278static void clflush_cache_range_opt(void *vaddr, unsigned int size)
279{
280 const unsigned long clflush_size = boot_cpu_data.x86_clflush_size;
281 void *p = (void *)((unsigned long)vaddr & ~(clflush_size - 1));
282 void *vend = vaddr + size;
283
284 if (p >= vend)
285 return;
286
287 for (; p < vend; p += clflush_size)
288 clflushopt(p);
289}
290
291
292
293
294
295
296
297
298
299void clflush_cache_range(void *vaddr, unsigned int size)
300{
301 mb();
302 clflush_cache_range_opt(vaddr, size);
303 mb();
304}
305EXPORT_SYMBOL_GPL(clflush_cache_range);
306
307void arch_invalidate_pmem(void *addr, size_t size)
308{
309 clflush_cache_range(addr, size);
310}
311EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
312
313static void __cpa_flush_all(void *arg)
314{
315 unsigned long cache = (unsigned long)arg;
316
317
318
319
320
321 __flush_tlb_all();
322
323 if (cache && boot_cpu_data.x86 >= 4)
324 wbinvd();
325}
326
327static void cpa_flush_all(unsigned long cache)
328{
329 BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
330
331 on_each_cpu(__cpa_flush_all, (void *) cache, 1);
332}
333
334void __cpa_flush_tlb(void *data)
335{
336 struct cpa_data *cpa = data;
337 unsigned int i;
338
339 for (i = 0; i < cpa->numpages; i++)
340 __flush_tlb_one_kernel(fix_addr(__cpa_addr(cpa, i)));
341}
342
343static void cpa_flush(struct cpa_data *data, int cache)
344{
345 struct cpa_data *cpa = data;
346 unsigned int i;
347
348 BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
349
350 if (cache && !static_cpu_has(X86_FEATURE_CLFLUSH)) {
351 cpa_flush_all(cache);
352 return;
353 }
354
355 if (cpa->numpages <= tlb_single_page_flush_ceiling)
356 on_each_cpu(__cpa_flush_tlb, cpa, 1);
357 else
358 flush_tlb_all();
359
360 if (!cache)
361 return;
362
363 mb();
364 for (i = 0; i < cpa->numpages; i++) {
365 unsigned long addr = __cpa_addr(cpa, i);
366 unsigned int level;
367
368 pte_t *pte = lookup_address(addr, &level);
369
370
371
372
373 if (pte && (pte_val(*pte) & _PAGE_PRESENT))
374 clflush_cache_range_opt((void *)fix_addr(addr), PAGE_SIZE);
375 }
376 mb();
377}
378
379static bool overlaps(unsigned long r1_start, unsigned long r1_end,
380 unsigned long r2_start, unsigned long r2_end)
381{
382 return (r1_start <= r2_end && r1_end >= r2_start) ||
383 (r2_start <= r1_end && r2_end >= r1_start);
384}
385
386#ifdef CONFIG_PCI_BIOS
387
388
389
390
391#define BIOS_PFN PFN_DOWN(BIOS_BEGIN)
392#define BIOS_PFN_END PFN_DOWN(BIOS_END - 1)
393
394static pgprotval_t protect_pci_bios(unsigned long spfn, unsigned long epfn)
395{
396 if (pcibios_enabled && overlaps(spfn, epfn, BIOS_PFN, BIOS_PFN_END))
397 return _PAGE_NX;
398 return 0;
399}
400#else
401static pgprotval_t protect_pci_bios(unsigned long spfn, unsigned long epfn)
402{
403 return 0;
404}
405#endif
406
407
408
409
410
411
412static pgprotval_t protect_rodata(unsigned long spfn, unsigned long epfn)
413{
414 unsigned long epfn_ro, spfn_ro = PFN_DOWN(__pa_symbol(__start_rodata));
415
416
417
418
419
420 epfn_ro = PFN_DOWN(__pa_symbol(__end_rodata)) - 1;
421
422 if (kernel_set_to_readonly && overlaps(spfn, epfn, spfn_ro, epfn_ro))
423 return _PAGE_RW;
424 return 0;
425}
426
427
428
429
430
431
432
433
434
435static pgprotval_t protect_kernel_text(unsigned long start, unsigned long end)
436{
437 unsigned long t_end = (unsigned long)_etext - 1;
438 unsigned long t_start = (unsigned long)_text;
439
440 if (overlaps(start, end, t_start, t_end))
441 return _PAGE_NX;
442 return 0;
443}
444
445#if defined(CONFIG_X86_64)
446
447
448
449
450
451
452
453
454
455static pgprotval_t protect_kernel_text_ro(unsigned long start,
456 unsigned long end)
457{
458 unsigned long t_end = (unsigned long)__end_rodata_hpage_align - 1;
459 unsigned long t_start = (unsigned long)_text;
460 unsigned int level;
461
462 if (!kernel_set_to_readonly || !overlaps(start, end, t_start, t_end))
463 return 0;
464
465
466
467
468
469
470
471
472
473
474
475
476 if (lookup_address(start, &level) && (level != PG_LEVEL_4K))
477 return _PAGE_RW;
478 return 0;
479}
480#else
481static pgprotval_t protect_kernel_text_ro(unsigned long start,
482 unsigned long end)
483{
484 return 0;
485}
486#endif
487
488static inline bool conflicts(pgprot_t prot, pgprotval_t val)
489{
490 return (pgprot_val(prot) & ~val) != pgprot_val(prot);
491}
492
493static inline void check_conflict(int warnlvl, pgprot_t prot, pgprotval_t val,
494 unsigned long start, unsigned long end,
495 unsigned long pfn, const char *txt)
496{
497 static const char *lvltxt[] = {
498 [CPA_CONFLICT] = "conflict",
499 [CPA_PROTECT] = "protect",
500 [CPA_DETECT] = "detect",
501 };
502
503 if (warnlvl > cpa_warn_level || !conflicts(prot, val))
504 return;
505
506 pr_warn("CPA %8s %10s: 0x%016lx - 0x%016lx PFN %lx req %016llx prevent %016llx\n",
507 lvltxt[warnlvl], txt, start, end, pfn, (unsigned long long)pgprot_val(prot),
508 (unsigned long long)val);
509}
510
511
512
513
514
515
516
517static inline pgprot_t static_protections(pgprot_t prot, unsigned long start,
518 unsigned long pfn, unsigned long npg,
519 int warnlvl)
520{
521 pgprotval_t forbidden, res;
522 unsigned long end;
523
524
525
526
527
528 if (!(pgprot_val(prot) & _PAGE_PRESENT))
529 return prot;
530
531
532 end = start + npg * PAGE_SIZE - 1;
533
534 res = protect_kernel_text(start, end);
535 check_conflict(warnlvl, prot, res, start, end, pfn, "Text NX");
536 forbidden = res;
537
538 res = protect_kernel_text_ro(start, end);
539 check_conflict(warnlvl, prot, res, start, end, pfn, "Text RO");
540 forbidden |= res;
541
542
543 res = protect_pci_bios(pfn, pfn + npg - 1);
544 check_conflict(warnlvl, prot, res, start, end, pfn, "PCIBIOS NX");
545 forbidden |= res;
546
547 res = protect_rodata(pfn, pfn + npg - 1);
548 check_conflict(warnlvl, prot, res, start, end, pfn, "Rodata RO");
549 forbidden |= res;
550
551 return __pgprot(pgprot_val(prot) & ~forbidden);
552}
553
554
555
556
557
558pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
559 unsigned int *level)
560{
561 p4d_t *p4d;
562 pud_t *pud;
563 pmd_t *pmd;
564
565 *level = PG_LEVEL_NONE;
566
567 if (pgd_none(*pgd))
568 return NULL;
569
570 p4d = p4d_offset(pgd, address);
571 if (p4d_none(*p4d))
572 return NULL;
573
574 *level = PG_LEVEL_512G;
575 if (p4d_large(*p4d) || !p4d_present(*p4d))
576 return (pte_t *)p4d;
577
578 pud = pud_offset(p4d, address);
579 if (pud_none(*pud))
580 return NULL;
581
582 *level = PG_LEVEL_1G;
583 if (pud_large(*pud) || !pud_present(*pud))
584 return (pte_t *)pud;
585
586 pmd = pmd_offset(pud, address);
587 if (pmd_none(*pmd))
588 return NULL;
589
590 *level = PG_LEVEL_2M;
591 if (pmd_large(*pmd) || !pmd_present(*pmd))
592 return (pte_t *)pmd;
593
594 *level = PG_LEVEL_4K;
595
596 return pte_offset_kernel(pmd, address);
597}
598
599
600
601
602
603
604
605
606
607pte_t *lookup_address(unsigned long address, unsigned int *level)
608{
609 return lookup_address_in_pgd(pgd_offset_k(address), address, level);
610}
611EXPORT_SYMBOL_GPL(lookup_address);
612
613static pte_t *_lookup_address_cpa(struct cpa_data *cpa, unsigned long address,
614 unsigned int *level)
615{
616 if (cpa->pgd)
617 return lookup_address_in_pgd(cpa->pgd + pgd_index(address),
618 address, level);
619
620 return lookup_address(address, level);
621}
622
623
624
625
626
627pmd_t *lookup_pmd_address(unsigned long address)
628{
629 pgd_t *pgd;
630 p4d_t *p4d;
631 pud_t *pud;
632
633 pgd = pgd_offset_k(address);
634 if (pgd_none(*pgd))
635 return NULL;
636
637 p4d = p4d_offset(pgd, address);
638 if (p4d_none(*p4d) || p4d_large(*p4d) || !p4d_present(*p4d))
639 return NULL;
640
641 pud = pud_offset(p4d, address);
642 if (pud_none(*pud) || pud_large(*pud) || !pud_present(*pud))
643 return NULL;
644
645 return pmd_offset(pud, address);
646}
647
648
649
650
651
652
653
654
655
656
657
658
659phys_addr_t slow_virt_to_phys(void *__virt_addr)
660{
661 unsigned long virt_addr = (unsigned long)__virt_addr;
662 phys_addr_t phys_addr;
663 unsigned long offset;
664 enum pg_level level;
665 pte_t *pte;
666
667 pte = lookup_address(virt_addr, &level);
668 BUG_ON(!pte);
669
670
671
672
673
674
675 switch (level) {
676 case PG_LEVEL_1G:
677 phys_addr = (phys_addr_t)pud_pfn(*(pud_t *)pte) << PAGE_SHIFT;
678 offset = virt_addr & ~PUD_PAGE_MASK;
679 break;
680 case PG_LEVEL_2M:
681 phys_addr = (phys_addr_t)pmd_pfn(*(pmd_t *)pte) << PAGE_SHIFT;
682 offset = virt_addr & ~PMD_PAGE_MASK;
683 break;
684 default:
685 phys_addr = (phys_addr_t)pte_pfn(*pte) << PAGE_SHIFT;
686 offset = virt_addr & ~PAGE_MASK;
687 }
688
689 return (phys_addr_t)(phys_addr | offset);
690}
691EXPORT_SYMBOL_GPL(slow_virt_to_phys);
692
693
694
695
696static void __set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
697{
698
699 set_pte_atomic(kpte, pte);
700#ifdef CONFIG_X86_32
701 if (!SHARED_KERNEL_PMD) {
702 struct page *page;
703
704 list_for_each_entry(page, &pgd_list, lru) {
705 pgd_t *pgd;
706 p4d_t *p4d;
707 pud_t *pud;
708 pmd_t *pmd;
709
710 pgd = (pgd_t *)page_address(page) + pgd_index(address);
711 p4d = p4d_offset(pgd, address);
712 pud = pud_offset(p4d, address);
713 pmd = pmd_offset(pud, address);
714 set_pte_atomic((pte_t *)pmd, pte);
715 }
716 }
717#endif
718}
719
720static pgprot_t pgprot_clear_protnone_bits(pgprot_t prot)
721{
722
723
724
725
726
727
728
729
730
731 if (!(pgprot_val(prot) & _PAGE_PRESENT))
732 pgprot_val(prot) &= ~_PAGE_GLOBAL;
733
734 return prot;
735}
736
737static int __should_split_large_page(pte_t *kpte, unsigned long address,
738 struct cpa_data *cpa)
739{
740 unsigned long numpages, pmask, psize, lpaddr, pfn, old_pfn;
741 pgprot_t old_prot, new_prot, req_prot, chk_prot;
742 pte_t new_pte, *tmp;
743 enum pg_level level;
744
745
746
747
748
749 tmp = _lookup_address_cpa(cpa, address, &level);
750 if (tmp != kpte)
751 return 1;
752
753 switch (level) {
754 case PG_LEVEL_2M:
755 old_prot = pmd_pgprot(*(pmd_t *)kpte);
756 old_pfn = pmd_pfn(*(pmd_t *)kpte);
757 cpa_inc_2m_checked();
758 break;
759 case PG_LEVEL_1G:
760 old_prot = pud_pgprot(*(pud_t *)kpte);
761 old_pfn = pud_pfn(*(pud_t *)kpte);
762 cpa_inc_1g_checked();
763 break;
764 default:
765 return -EINVAL;
766 }
767
768 psize = page_level_size(level);
769 pmask = page_level_mask(level);
770
771
772
773
774
775 lpaddr = (address + psize) & pmask;
776 numpages = (lpaddr - address) >> PAGE_SHIFT;
777 if (numpages < cpa->numpages)
778 cpa->numpages = numpages;
779
780
781
782
783
784
785
786
787 req_prot = pgprot_large_2_4k(old_prot);
788
789 pgprot_val(req_prot) &= ~pgprot_val(cpa->mask_clr);
790 pgprot_val(req_prot) |= pgprot_val(cpa->mask_set);
791
792
793
794
795
796
797 req_prot = pgprot_4k_2_large(req_prot);
798 req_prot = pgprot_clear_protnone_bits(req_prot);
799 if (pgprot_val(req_prot) & _PAGE_PRESENT)
800 pgprot_val(req_prot) |= _PAGE_PSE;
801
802
803
804
805
806 pfn = old_pfn + ((address & (psize - 1)) >> PAGE_SHIFT);
807 cpa->pfn = pfn;
808
809
810
811
812
813 lpaddr = address & pmask;
814 numpages = psize >> PAGE_SHIFT;
815
816
817
818
819
820
821 chk_prot = static_protections(old_prot, lpaddr, old_pfn, numpages,
822 CPA_CONFLICT);
823
824 if (WARN_ON_ONCE(pgprot_val(chk_prot) != pgprot_val(old_prot))) {
825
826
827
828
829 cpa->force_static_prot = 1;
830 return 1;
831 }
832
833
834
835
836
837
838
839
840
841
842 if (pgprot_val(req_prot) == pgprot_val(old_prot)) {
843 cpa_inc_lp_sameprot(level);
844 return 0;
845 }
846
847
848
849
850 if (address != lpaddr || cpa->numpages != numpages)
851 return 1;
852
853
854
855
856
857 new_prot = static_protections(req_prot, lpaddr, old_pfn, numpages,
858 CPA_DETECT);
859
860
861
862
863
864
865
866
867
868
869 if (pgprot_val(req_prot) != pgprot_val(new_prot))
870 return 1;
871
872
873 new_pte = pfn_pte(old_pfn, new_prot);
874 __set_pmd_pte(kpte, address, new_pte);
875 cpa->flags |= CPA_FLUSHTLB;
876 cpa_inc_lp_preserved(level);
877 return 0;
878}
879
880static int should_split_large_page(pte_t *kpte, unsigned long address,
881 struct cpa_data *cpa)
882{
883 int do_split;
884
885 if (cpa->force_split)
886 return 1;
887
888 spin_lock(&pgd_lock);
889 do_split = __should_split_large_page(kpte, address, cpa);
890 spin_unlock(&pgd_lock);
891
892 return do_split;
893}
894
895static void split_set_pte(struct cpa_data *cpa, pte_t *pte, unsigned long pfn,
896 pgprot_t ref_prot, unsigned long address,
897 unsigned long size)
898{
899 unsigned int npg = PFN_DOWN(size);
900 pgprot_t prot;
901
902
903
904
905
906 if (!cpa->force_static_prot)
907 goto set;
908
909 prot = static_protections(ref_prot, address, pfn, npg, CPA_PROTECT);
910
911 if (pgprot_val(prot) == pgprot_val(ref_prot))
912 goto set;
913
914
915
916
917
918
919
920
921
922 if (size == PAGE_SIZE)
923 ref_prot = prot;
924 else
925 pr_warn_once("CPA: Cannot fixup static protections for PUD split\n");
926set:
927 set_pte(pte, pfn_pte(pfn, ref_prot));
928}
929
930static int
931__split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address,
932 struct page *base)
933{
934 unsigned long lpaddr, lpinc, ref_pfn, pfn, pfninc = 1;
935 pte_t *pbase = (pte_t *)page_address(base);
936 unsigned int i, level;
937 pgprot_t ref_prot;
938 pte_t *tmp;
939
940 spin_lock(&pgd_lock);
941
942
943
944
945 tmp = _lookup_address_cpa(cpa, address, &level);
946 if (tmp != kpte) {
947 spin_unlock(&pgd_lock);
948 return 1;
949 }
950
951 paravirt_alloc_pte(&init_mm, page_to_pfn(base));
952
953 switch (level) {
954 case PG_LEVEL_2M:
955 ref_prot = pmd_pgprot(*(pmd_t *)kpte);
956
957
958
959
960 ref_prot = pgprot_large_2_4k(ref_prot);
961 ref_pfn = pmd_pfn(*(pmd_t *)kpte);
962 lpaddr = address & PMD_MASK;
963 lpinc = PAGE_SIZE;
964 break;
965
966 case PG_LEVEL_1G:
967 ref_prot = pud_pgprot(*(pud_t *)kpte);
968 ref_pfn = pud_pfn(*(pud_t *)kpte);
969 pfninc = PMD_PAGE_SIZE >> PAGE_SHIFT;
970 lpaddr = address & PUD_MASK;
971 lpinc = PMD_SIZE;
972
973
974
975
976
977 if (!(pgprot_val(ref_prot) & _PAGE_PRESENT))
978 pgprot_val(ref_prot) &= ~_PAGE_PSE;
979 break;
980
981 default:
982 spin_unlock(&pgd_lock);
983 return 1;
984 }
985
986 ref_prot = pgprot_clear_protnone_bits(ref_prot);
987
988
989
990
991 pfn = ref_pfn;
992 for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc, lpaddr += lpinc)
993 split_set_pte(cpa, pbase + i, pfn, ref_prot, lpaddr, lpinc);
994
995 if (virt_addr_valid(address)) {
996 unsigned long pfn = PFN_DOWN(__pa(address));
997
998 if (pfn_range_is_mapped(pfn, pfn + 1))
999 split_page_count(level);
1000 }
1001
1002
1003
1004
1005
1006
1007
1008
1009 __set_pmd_pte(kpte, address, mk_pte(base, __pgprot(_KERNPG_TABLE)));
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029 flush_tlb_all();
1030 spin_unlock(&pgd_lock);
1031
1032 return 0;
1033}
1034
1035static int split_large_page(struct cpa_data *cpa, pte_t *kpte,
1036 unsigned long address)
1037{
1038 struct page *base;
1039
1040 if (!debug_pagealloc_enabled())
1041 spin_unlock(&cpa_lock);
1042 base = alloc_pages(GFP_KERNEL, 0);
1043 if (!debug_pagealloc_enabled())
1044 spin_lock(&cpa_lock);
1045 if (!base)
1046 return -ENOMEM;
1047
1048 if (__split_large_page(cpa, kpte, address, base))
1049 __free_page(base);
1050
1051 return 0;
1052}
1053
1054static bool try_to_free_pte_page(pte_t *pte)
1055{
1056 int i;
1057
1058 for (i = 0; i < PTRS_PER_PTE; i++)
1059 if (!pte_none(pte[i]))
1060 return false;
1061
1062 free_page((unsigned long)pte);
1063 return true;
1064}
1065
1066static bool try_to_free_pmd_page(pmd_t *pmd)
1067{
1068 int i;
1069
1070 for (i = 0; i < PTRS_PER_PMD; i++)
1071 if (!pmd_none(pmd[i]))
1072 return false;
1073
1074 free_page((unsigned long)pmd);
1075 return true;
1076}
1077
1078static bool unmap_pte_range(pmd_t *pmd, unsigned long start, unsigned long end)
1079{
1080 pte_t *pte = pte_offset_kernel(pmd, start);
1081
1082 while (start < end) {
1083 set_pte(pte, __pte(0));
1084
1085 start += PAGE_SIZE;
1086 pte++;
1087 }
1088
1089 if (try_to_free_pte_page((pte_t *)pmd_page_vaddr(*pmd))) {
1090 pmd_clear(pmd);
1091 return true;
1092 }
1093 return false;
1094}
1095
1096static void __unmap_pmd_range(pud_t *pud, pmd_t *pmd,
1097 unsigned long start, unsigned long end)
1098{
1099 if (unmap_pte_range(pmd, start, end))
1100 if (try_to_free_pmd_page((pmd_t *)pud_page_vaddr(*pud)))
1101 pud_clear(pud);
1102}
1103
1104static void unmap_pmd_range(pud_t *pud, unsigned long start, unsigned long end)
1105{
1106 pmd_t *pmd = pmd_offset(pud, start);
1107
1108
1109
1110
1111 if (start & (PMD_SIZE - 1)) {
1112 unsigned long next_page = (start + PMD_SIZE) & PMD_MASK;
1113 unsigned long pre_end = min_t(unsigned long, end, next_page);
1114
1115 __unmap_pmd_range(pud, pmd, start, pre_end);
1116
1117 start = pre_end;
1118 pmd++;
1119 }
1120
1121
1122
1123
1124 while (end - start >= PMD_SIZE) {
1125 if (pmd_large(*pmd))
1126 pmd_clear(pmd);
1127 else
1128 __unmap_pmd_range(pud, pmd, start, start + PMD_SIZE);
1129
1130 start += PMD_SIZE;
1131 pmd++;
1132 }
1133
1134
1135
1136
1137 if (start < end)
1138 return __unmap_pmd_range(pud, pmd, start, end);
1139
1140
1141
1142
1143 if (!pud_none(*pud))
1144 if (try_to_free_pmd_page((pmd_t *)pud_page_vaddr(*pud)))
1145 pud_clear(pud);
1146}
1147
1148static void unmap_pud_range(p4d_t *p4d, unsigned long start, unsigned long end)
1149{
1150 pud_t *pud = pud_offset(p4d, start);
1151
1152
1153
1154
1155 if (start & (PUD_SIZE - 1)) {
1156 unsigned long next_page = (start + PUD_SIZE) & PUD_MASK;
1157 unsigned long pre_end = min_t(unsigned long, end, next_page);
1158
1159 unmap_pmd_range(pud, start, pre_end);
1160
1161 start = pre_end;
1162 pud++;
1163 }
1164
1165
1166
1167
1168 while (end - start >= PUD_SIZE) {
1169
1170 if (pud_large(*pud))
1171 pud_clear(pud);
1172 else
1173 unmap_pmd_range(pud, start, start + PUD_SIZE);
1174
1175 start += PUD_SIZE;
1176 pud++;
1177 }
1178
1179
1180
1181
1182 if (start < end)
1183 unmap_pmd_range(pud, start, end);
1184
1185
1186
1187
1188
1189}
1190
1191static int alloc_pte_page(pmd_t *pmd)
1192{
1193 pte_t *pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
1194 if (!pte)
1195 return -1;
1196
1197 set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE));
1198 return 0;
1199}
1200
1201static int alloc_pmd_page(pud_t *pud)
1202{
1203 pmd_t *pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
1204 if (!pmd)
1205 return -1;
1206
1207 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
1208 return 0;
1209}
1210
1211static void populate_pte(struct cpa_data *cpa,
1212 unsigned long start, unsigned long end,
1213 unsigned num_pages, pmd_t *pmd, pgprot_t pgprot)
1214{
1215 pte_t *pte;
1216
1217 pte = pte_offset_kernel(pmd, start);
1218
1219 pgprot = pgprot_clear_protnone_bits(pgprot);
1220
1221 while (num_pages-- && start < end) {
1222 set_pte(pte, pfn_pte(cpa->pfn, pgprot));
1223
1224 start += PAGE_SIZE;
1225 cpa->pfn++;
1226 pte++;
1227 }
1228}
1229
1230static long populate_pmd(struct cpa_data *cpa,
1231 unsigned long start, unsigned long end,
1232 unsigned num_pages, pud_t *pud, pgprot_t pgprot)
1233{
1234 long cur_pages = 0;
1235 pmd_t *pmd;
1236 pgprot_t pmd_pgprot;
1237
1238
1239
1240
1241 if (start & (PMD_SIZE - 1)) {
1242 unsigned long pre_end = start + (num_pages << PAGE_SHIFT);
1243 unsigned long next_page = (start + PMD_SIZE) & PMD_MASK;
1244
1245 pre_end = min_t(unsigned long, pre_end, next_page);
1246 cur_pages = (pre_end - start) >> PAGE_SHIFT;
1247 cur_pages = min_t(unsigned int, num_pages, cur_pages);
1248
1249
1250
1251
1252 pmd = pmd_offset(pud, start);
1253 if (pmd_none(*pmd))
1254 if (alloc_pte_page(pmd))
1255 return -1;
1256
1257 populate_pte(cpa, start, pre_end, cur_pages, pmd, pgprot);
1258
1259 start = pre_end;
1260 }
1261
1262
1263
1264
1265 if (num_pages == cur_pages)
1266 return cur_pages;
1267
1268 pmd_pgprot = pgprot_4k_2_large(pgprot);
1269
1270 while (end - start >= PMD_SIZE) {
1271
1272
1273
1274
1275 if (pud_none(*pud))
1276 if (alloc_pmd_page(pud))
1277 return -1;
1278
1279 pmd = pmd_offset(pud, start);
1280
1281 set_pmd(pmd, pmd_mkhuge(pfn_pmd(cpa->pfn,
1282 canon_pgprot(pmd_pgprot))));
1283
1284 start += PMD_SIZE;
1285 cpa->pfn += PMD_SIZE >> PAGE_SHIFT;
1286 cur_pages += PMD_SIZE >> PAGE_SHIFT;
1287 }
1288
1289
1290
1291
1292 if (start < end) {
1293 pmd = pmd_offset(pud, start);
1294 if (pmd_none(*pmd))
1295 if (alloc_pte_page(pmd))
1296 return -1;
1297
1298 populate_pte(cpa, start, end, num_pages - cur_pages,
1299 pmd, pgprot);
1300 }
1301 return num_pages;
1302}
1303
1304static int populate_pud(struct cpa_data *cpa, unsigned long start, p4d_t *p4d,
1305 pgprot_t pgprot)
1306{
1307 pud_t *pud;
1308 unsigned long end;
1309 long cur_pages = 0;
1310 pgprot_t pud_pgprot;
1311
1312 end = start + (cpa->numpages << PAGE_SHIFT);
1313
1314
1315
1316
1317
1318 if (start & (PUD_SIZE - 1)) {
1319 unsigned long pre_end;
1320 unsigned long next_page = (start + PUD_SIZE) & PUD_MASK;
1321
1322 pre_end = min_t(unsigned long, end, next_page);
1323 cur_pages = (pre_end - start) >> PAGE_SHIFT;
1324 cur_pages = min_t(int, (int)cpa->numpages, cur_pages);
1325
1326 pud = pud_offset(p4d, start);
1327
1328
1329
1330
1331 if (pud_none(*pud))
1332 if (alloc_pmd_page(pud))
1333 return -1;
1334
1335 cur_pages = populate_pmd(cpa, start, pre_end, cur_pages,
1336 pud, pgprot);
1337 if (cur_pages < 0)
1338 return cur_pages;
1339
1340 start = pre_end;
1341 }
1342
1343
1344 if (cpa->numpages == cur_pages)
1345 return cur_pages;
1346
1347 pud = pud_offset(p4d, start);
1348 pud_pgprot = pgprot_4k_2_large(pgprot);
1349
1350
1351
1352
1353 while (boot_cpu_has(X86_FEATURE_GBPAGES) && end - start >= PUD_SIZE) {
1354 set_pud(pud, pud_mkhuge(pfn_pud(cpa->pfn,
1355 canon_pgprot(pud_pgprot))));
1356
1357 start += PUD_SIZE;
1358 cpa->pfn += PUD_SIZE >> PAGE_SHIFT;
1359 cur_pages += PUD_SIZE >> PAGE_SHIFT;
1360 pud++;
1361 }
1362
1363
1364 if (start < end) {
1365 long tmp;
1366
1367 pud = pud_offset(p4d, start);
1368 if (pud_none(*pud))
1369 if (alloc_pmd_page(pud))
1370 return -1;
1371
1372 tmp = populate_pmd(cpa, start, end, cpa->numpages - cur_pages,
1373 pud, pgprot);
1374 if (tmp < 0)
1375 return cur_pages;
1376
1377 cur_pages += tmp;
1378 }
1379 return cur_pages;
1380}
1381
1382
1383
1384
1385
1386static int populate_pgd(struct cpa_data *cpa, unsigned long addr)
1387{
1388 pgprot_t pgprot = __pgprot(_KERNPG_TABLE);
1389 pud_t *pud = NULL;
1390 p4d_t *p4d;
1391 pgd_t *pgd_entry;
1392 long ret;
1393
1394 pgd_entry = cpa->pgd + pgd_index(addr);
1395
1396 if (pgd_none(*pgd_entry)) {
1397 p4d = (p4d_t *)get_zeroed_page(GFP_KERNEL);
1398 if (!p4d)
1399 return -1;
1400
1401 set_pgd(pgd_entry, __pgd(__pa(p4d) | _KERNPG_TABLE));
1402 }
1403
1404
1405
1406
1407 p4d = p4d_offset(pgd_entry, addr);
1408 if (p4d_none(*p4d)) {
1409 pud = (pud_t *)get_zeroed_page(GFP_KERNEL);
1410 if (!pud)
1411 return -1;
1412
1413 set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE));
1414 }
1415
1416 pgprot_val(pgprot) &= ~pgprot_val(cpa->mask_clr);
1417 pgprot_val(pgprot) |= pgprot_val(cpa->mask_set);
1418
1419 ret = populate_pud(cpa, addr, p4d, pgprot);
1420 if (ret < 0) {
1421
1422
1423
1424
1425
1426 unmap_pud_range(p4d, addr,
1427 addr + (cpa->numpages << PAGE_SHIFT));
1428 return ret;
1429 }
1430
1431 cpa->numpages = ret;
1432 return 0;
1433}
1434
1435static int __cpa_process_fault(struct cpa_data *cpa, unsigned long vaddr,
1436 int primary)
1437{
1438 if (cpa->pgd) {
1439
1440
1441
1442
1443
1444 return populate_pgd(cpa, vaddr);
1445 }
1446
1447
1448
1449
1450 if (!primary) {
1451 cpa->numpages = 1;
1452 return 0;
1453 }
1454
1455
1456
1457
1458
1459
1460
1461
1462 if (within(vaddr, PAGE_OFFSET,
1463 PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT))) {
1464 cpa->numpages = 1;
1465 cpa->pfn = __pa(vaddr) >> PAGE_SHIFT;
1466 return 0;
1467
1468 } else if (__cpa_pfn_in_highmap(cpa->pfn)) {
1469
1470 return -EFAULT;
1471 } else {
1472 WARN(1, KERN_WARNING "CPA: called for zero pte. "
1473 "vaddr = %lx cpa->vaddr = %lx\n", vaddr,
1474 *cpa->vaddr);
1475
1476 return -EFAULT;
1477 }
1478}
1479
1480static int __change_page_attr(struct cpa_data *cpa, int primary)
1481{
1482 unsigned long address;
1483 int do_split, err;
1484 unsigned int level;
1485 pte_t *kpte, old_pte;
1486
1487 address = __cpa_addr(cpa, cpa->curpage);
1488repeat:
1489 kpte = _lookup_address_cpa(cpa, address, &level);
1490 if (!kpte)
1491 return __cpa_process_fault(cpa, address, primary);
1492
1493 old_pte = *kpte;
1494 if (pte_none(old_pte))
1495 return __cpa_process_fault(cpa, address, primary);
1496
1497 if (level == PG_LEVEL_4K) {
1498 pte_t new_pte;
1499 pgprot_t new_prot = pte_pgprot(old_pte);
1500 unsigned long pfn = pte_pfn(old_pte);
1501
1502 pgprot_val(new_prot) &= ~pgprot_val(cpa->mask_clr);
1503 pgprot_val(new_prot) |= pgprot_val(cpa->mask_set);
1504
1505 cpa_inc_4k_install();
1506 new_prot = static_protections(new_prot, address, pfn, 1,
1507 CPA_PROTECT);
1508
1509 new_prot = pgprot_clear_protnone_bits(new_prot);
1510
1511
1512
1513
1514
1515
1516 new_pte = pfn_pte(pfn, new_prot);
1517 cpa->pfn = pfn;
1518
1519
1520
1521 if (pte_val(old_pte) != pte_val(new_pte)) {
1522 set_pte_atomic(kpte, new_pte);
1523 cpa->flags |= CPA_FLUSHTLB;
1524 }
1525 cpa->numpages = 1;
1526 return 0;
1527 }
1528
1529
1530
1531
1532
1533 do_split = should_split_large_page(kpte, address, cpa);
1534
1535
1536
1537
1538
1539 if (do_split <= 0)
1540 return do_split;
1541
1542
1543
1544
1545 err = split_large_page(cpa, kpte, address);
1546 if (!err)
1547 goto repeat;
1548
1549 return err;
1550}
1551
1552static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias);
1553
1554static int cpa_process_alias(struct cpa_data *cpa)
1555{
1556 struct cpa_data alias_cpa;
1557 unsigned long laddr = (unsigned long)__va(cpa->pfn << PAGE_SHIFT);
1558 unsigned long vaddr;
1559 int ret;
1560
1561 if (!pfn_range_is_mapped(cpa->pfn, cpa->pfn + 1))
1562 return 0;
1563
1564
1565
1566
1567
1568 vaddr = __cpa_addr(cpa, cpa->curpage);
1569 if (!(within(vaddr, PAGE_OFFSET,
1570 PAGE_OFFSET + (max_pfn_mapped << PAGE_SHIFT)))) {
1571
1572 alias_cpa = *cpa;
1573 alias_cpa.vaddr = &laddr;
1574 alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY);
1575 alias_cpa.curpage = 0;
1576
1577 ret = __change_page_attr_set_clr(&alias_cpa, 0);
1578 if (ret)
1579 return ret;
1580 }
1581
1582#ifdef CONFIG_X86_64
1583
1584
1585
1586
1587
1588 if (!within(vaddr, (unsigned long)_text, _brk_end) &&
1589 __cpa_pfn_in_highmap(cpa->pfn)) {
1590 unsigned long temp_cpa_vaddr = (cpa->pfn << PAGE_SHIFT) +
1591 __START_KERNEL_map - phys_base;
1592 alias_cpa = *cpa;
1593 alias_cpa.vaddr = &temp_cpa_vaddr;
1594 alias_cpa.flags &= ~(CPA_PAGES_ARRAY | CPA_ARRAY);
1595 alias_cpa.curpage = 0;
1596
1597
1598
1599
1600
1601 __change_page_attr_set_clr(&alias_cpa, 0);
1602 }
1603#endif
1604
1605 return 0;
1606}
1607
1608static int __change_page_attr_set_clr(struct cpa_data *cpa, int checkalias)
1609{
1610 unsigned long numpages = cpa->numpages;
1611 unsigned long rempages = numpages;
1612 int ret = 0;
1613
1614 while (rempages) {
1615
1616
1617
1618
1619 cpa->numpages = rempages;
1620
1621 if (cpa->flags & (CPA_ARRAY | CPA_PAGES_ARRAY))
1622 cpa->numpages = 1;
1623
1624 if (!debug_pagealloc_enabled())
1625 spin_lock(&cpa_lock);
1626 ret = __change_page_attr(cpa, checkalias);
1627 if (!debug_pagealloc_enabled())
1628 spin_unlock(&cpa_lock);
1629 if (ret)
1630 goto out;
1631
1632 if (checkalias) {
1633 ret = cpa_process_alias(cpa);
1634 if (ret)
1635 goto out;
1636 }
1637
1638
1639
1640
1641
1642
1643 BUG_ON(cpa->numpages > rempages || !cpa->numpages);
1644 rempages -= cpa->numpages;
1645 cpa->curpage += cpa->numpages;
1646 }
1647
1648out:
1649
1650 cpa->numpages = numpages;
1651 return ret;
1652}
1653
1654static int change_page_attr_set_clr(unsigned long *addr, int numpages,
1655 pgprot_t mask_set, pgprot_t mask_clr,
1656 int force_split, int in_flag,
1657 struct page **pages)
1658{
1659 struct cpa_data cpa;
1660 int ret, cache, checkalias;
1661
1662 memset(&cpa, 0, sizeof(cpa));
1663
1664
1665
1666
1667
1668 mask_set = canon_pgprot(mask_set);
1669
1670 if (!pgprot_val(mask_set) && !pgprot_val(mask_clr) && !force_split)
1671 return 0;
1672
1673
1674 if (in_flag & CPA_ARRAY) {
1675 int i;
1676 for (i = 0; i < numpages; i++) {
1677 if (addr[i] & ~PAGE_MASK) {
1678 addr[i] &= PAGE_MASK;
1679 WARN_ON_ONCE(1);
1680 }
1681 }
1682 } else if (!(in_flag & CPA_PAGES_ARRAY)) {
1683
1684
1685
1686
1687 if (*addr & ~PAGE_MASK) {
1688 *addr &= PAGE_MASK;
1689
1690
1691
1692 WARN_ON_ONCE(1);
1693 }
1694 }
1695
1696
1697 kmap_flush_unused();
1698
1699 vm_unmap_aliases();
1700
1701 cpa.vaddr = addr;
1702 cpa.pages = pages;
1703 cpa.numpages = numpages;
1704 cpa.mask_set = mask_set;
1705 cpa.mask_clr = mask_clr;
1706 cpa.flags = 0;
1707 cpa.curpage = 0;
1708 cpa.force_split = force_split;
1709
1710 if (in_flag & (CPA_ARRAY | CPA_PAGES_ARRAY))
1711 cpa.flags |= in_flag;
1712
1713
1714 checkalias = (pgprot_val(mask_set) | pgprot_val(mask_clr)) != _PAGE_NX;
1715
1716 if (in_flag & CPA_NO_CHECK_ALIAS)
1717 checkalias = 0;
1718
1719 ret = __change_page_attr_set_clr(&cpa, checkalias);
1720
1721
1722
1723
1724 if (!(cpa.flags & CPA_FLUSHTLB))
1725 goto out;
1726
1727
1728
1729
1730
1731 cache = !!pgprot2cachemode(mask_set);
1732
1733
1734
1735
1736 if (ret) {
1737 cpa_flush_all(cache);
1738 goto out;
1739 }
1740
1741 cpa_flush(&cpa, cache);
1742out:
1743 return ret;
1744}
1745
1746static inline int change_page_attr_set(unsigned long *addr, int numpages,
1747 pgprot_t mask, int array)
1748{
1749 return change_page_attr_set_clr(addr, numpages, mask, __pgprot(0), 0,
1750 (array ? CPA_ARRAY : 0), NULL);
1751}
1752
1753static inline int change_page_attr_clear(unsigned long *addr, int numpages,
1754 pgprot_t mask, int array)
1755{
1756 return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask, 0,
1757 (array ? CPA_ARRAY : 0), NULL);
1758}
1759
1760static inline int cpa_set_pages_array(struct page **pages, int numpages,
1761 pgprot_t mask)
1762{
1763 return change_page_attr_set_clr(NULL, numpages, mask, __pgprot(0), 0,
1764 CPA_PAGES_ARRAY, pages);
1765}
1766
1767static inline int cpa_clear_pages_array(struct page **pages, int numpages,
1768 pgprot_t mask)
1769{
1770 return change_page_attr_set_clr(NULL, numpages, __pgprot(0), mask, 0,
1771 CPA_PAGES_ARRAY, pages);
1772}
1773
1774int _set_memory_uc(unsigned long addr, int numpages)
1775{
1776
1777
1778
1779
1780
1781
1782 return change_page_attr_set(&addr, numpages,
1783 cachemode2pgprot(_PAGE_CACHE_MODE_UC_MINUS),
1784 0);
1785}
1786
1787int set_memory_uc(unsigned long addr, int numpages)
1788{
1789 int ret;
1790
1791
1792
1793
1794 ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
1795 _PAGE_CACHE_MODE_UC_MINUS, NULL);
1796 if (ret)
1797 goto out_err;
1798
1799 ret = _set_memory_uc(addr, numpages);
1800 if (ret)
1801 goto out_free;
1802
1803 return 0;
1804
1805out_free:
1806 free_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE);
1807out_err:
1808 return ret;
1809}
1810EXPORT_SYMBOL(set_memory_uc);
1811
1812static int _set_memory_array(unsigned long *addr, int numpages,
1813 enum page_cache_mode new_type)
1814{
1815 enum page_cache_mode set_type;
1816 int i, j;
1817 int ret;
1818
1819 for (i = 0; i < numpages; i++) {
1820 ret = reserve_memtype(__pa(addr[i]), __pa(addr[i]) + PAGE_SIZE,
1821 new_type, NULL);
1822 if (ret)
1823 goto out_free;
1824 }
1825
1826
1827 set_type = (new_type == _PAGE_CACHE_MODE_WC) ?
1828 _PAGE_CACHE_MODE_UC_MINUS : new_type;
1829
1830 ret = change_page_attr_set(addr, numpages,
1831 cachemode2pgprot(set_type), 1);
1832
1833 if (!ret && new_type == _PAGE_CACHE_MODE_WC)
1834 ret = change_page_attr_set_clr(addr, numpages,
1835 cachemode2pgprot(
1836 _PAGE_CACHE_MODE_WC),
1837 __pgprot(_PAGE_CACHE_MASK),
1838 0, CPA_ARRAY, NULL);
1839 if (ret)
1840 goto out_free;
1841
1842 return 0;
1843
1844out_free:
1845 for (j = 0; j < i; j++)
1846 free_memtype(__pa(addr[j]), __pa(addr[j]) + PAGE_SIZE);
1847
1848 return ret;
1849}
1850
1851int set_memory_array_uc(unsigned long *addr, int numpages)
1852{
1853 return _set_memory_array(addr, numpages, _PAGE_CACHE_MODE_UC_MINUS);
1854}
1855EXPORT_SYMBOL(set_memory_array_uc);
1856
1857int set_memory_array_wc(unsigned long *addr, int numpages)
1858{
1859 return _set_memory_array(addr, numpages, _PAGE_CACHE_MODE_WC);
1860}
1861EXPORT_SYMBOL(set_memory_array_wc);
1862
1863int set_memory_array_wt(unsigned long *addr, int numpages)
1864{
1865 return _set_memory_array(addr, numpages, _PAGE_CACHE_MODE_WT);
1866}
1867EXPORT_SYMBOL_GPL(set_memory_array_wt);
1868
1869int _set_memory_wc(unsigned long addr, int numpages)
1870{
1871 int ret;
1872
1873 ret = change_page_attr_set(&addr, numpages,
1874 cachemode2pgprot(_PAGE_CACHE_MODE_UC_MINUS),
1875 0);
1876 if (!ret) {
1877 ret = change_page_attr_set_clr(&addr, numpages,
1878 cachemode2pgprot(_PAGE_CACHE_MODE_WC),
1879 __pgprot(_PAGE_CACHE_MASK),
1880 0, 0, NULL);
1881 }
1882 return ret;
1883}
1884
1885int set_memory_wc(unsigned long addr, int numpages)
1886{
1887 int ret;
1888
1889 ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
1890 _PAGE_CACHE_MODE_WC, NULL);
1891 if (ret)
1892 return ret;
1893
1894 ret = _set_memory_wc(addr, numpages);
1895 if (ret)
1896 free_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE);
1897
1898 return ret;
1899}
1900EXPORT_SYMBOL(set_memory_wc);
1901
1902int _set_memory_wt(unsigned long addr, int numpages)
1903{
1904 return change_page_attr_set(&addr, numpages,
1905 cachemode2pgprot(_PAGE_CACHE_MODE_WT), 0);
1906}
1907
1908int set_memory_wt(unsigned long addr, int numpages)
1909{
1910 int ret;
1911
1912 ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
1913 _PAGE_CACHE_MODE_WT, NULL);
1914 if (ret)
1915 return ret;
1916
1917 ret = _set_memory_wt(addr, numpages);
1918 if (ret)
1919 free_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE);
1920
1921 return ret;
1922}
1923EXPORT_SYMBOL_GPL(set_memory_wt);
1924
1925int _set_memory_wb(unsigned long addr, int numpages)
1926{
1927
1928 return change_page_attr_clear(&addr, numpages,
1929 __pgprot(_PAGE_CACHE_MASK), 0);
1930}
1931
1932int set_memory_wb(unsigned long addr, int numpages)
1933{
1934 int ret;
1935
1936 ret = _set_memory_wb(addr, numpages);
1937 if (ret)
1938 return ret;
1939
1940 free_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE);
1941 return 0;
1942}
1943EXPORT_SYMBOL(set_memory_wb);
1944
1945int set_memory_array_wb(unsigned long *addr, int numpages)
1946{
1947 int i;
1948 int ret;
1949
1950
1951 ret = change_page_attr_clear(addr, numpages,
1952 __pgprot(_PAGE_CACHE_MASK), 1);
1953 if (ret)
1954 return ret;
1955
1956 for (i = 0; i < numpages; i++)
1957 free_memtype(__pa(addr[i]), __pa(addr[i]) + PAGE_SIZE);
1958
1959 return 0;
1960}
1961EXPORT_SYMBOL(set_memory_array_wb);
1962
1963int set_memory_x(unsigned long addr, int numpages)
1964{
1965 if (!(__supported_pte_mask & _PAGE_NX))
1966 return 0;
1967
1968 return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_NX), 0);
1969}
1970EXPORT_SYMBOL(set_memory_x);
1971
1972int set_memory_nx(unsigned long addr, int numpages)
1973{
1974 if (!(__supported_pte_mask & _PAGE_NX))
1975 return 0;
1976
1977 return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_NX), 0);
1978}
1979EXPORT_SYMBOL(set_memory_nx);
1980
1981int set_memory_ro(unsigned long addr, int numpages)
1982{
1983 return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_RW), 0);
1984}
1985
1986int set_memory_rw(unsigned long addr, int numpages)
1987{
1988 return change_page_attr_set(&addr, numpages, __pgprot(_PAGE_RW), 0);
1989}
1990
1991int set_memory_np(unsigned long addr, int numpages)
1992{
1993 return change_page_attr_clear(&addr, numpages, __pgprot(_PAGE_PRESENT), 0);
1994}
1995
1996int set_memory_np_noalias(unsigned long addr, int numpages)
1997{
1998 int cpa_flags = CPA_NO_CHECK_ALIAS;
1999
2000 return change_page_attr_set_clr(&addr, numpages, __pgprot(0),
2001 __pgprot(_PAGE_PRESENT), 0,
2002 cpa_flags, NULL);
2003}
2004
2005int set_memory_4k(unsigned long addr, int numpages)
2006{
2007 return change_page_attr_set_clr(&addr, numpages, __pgprot(0),
2008 __pgprot(0), 1, 0, NULL);
2009}
2010
2011int set_memory_nonglobal(unsigned long addr, int numpages)
2012{
2013 return change_page_attr_clear(&addr, numpages,
2014 __pgprot(_PAGE_GLOBAL), 0);
2015}
2016
2017int set_memory_global(unsigned long addr, int numpages)
2018{
2019 return change_page_attr_set(&addr, numpages,
2020 __pgprot(_PAGE_GLOBAL), 0);
2021}
2022
2023static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
2024{
2025 struct cpa_data cpa;
2026 int ret;
2027
2028
2029 if (!mem_encrypt_active())
2030 return 0;
2031
2032
2033 if (WARN_ONCE(addr & ~PAGE_MASK, "misaligned address: %#lx\n", addr))
2034 addr &= PAGE_MASK;
2035
2036 memset(&cpa, 0, sizeof(cpa));
2037 cpa.vaddr = &addr;
2038 cpa.numpages = numpages;
2039 cpa.mask_set = enc ? __pgprot(_PAGE_ENC) : __pgprot(0);
2040 cpa.mask_clr = enc ? __pgprot(0) : __pgprot(_PAGE_ENC);
2041 cpa.pgd = init_mm.pgd;
2042
2043
2044 kmap_flush_unused();
2045 vm_unmap_aliases();
2046
2047
2048
2049
2050 cpa_flush(&cpa, 1);
2051
2052 ret = __change_page_attr_set_clr(&cpa, 1);
2053
2054
2055
2056
2057
2058
2059
2060
2061 cpa_flush(&cpa, 0);
2062
2063 return ret;
2064}
2065
2066int set_memory_encrypted(unsigned long addr, int numpages)
2067{
2068 return __set_memory_enc_dec(addr, numpages, true);
2069}
2070EXPORT_SYMBOL_GPL(set_memory_encrypted);
2071
2072int set_memory_decrypted(unsigned long addr, int numpages)
2073{
2074 return __set_memory_enc_dec(addr, numpages, false);
2075}
2076EXPORT_SYMBOL_GPL(set_memory_decrypted);
2077
2078int set_pages_uc(struct page *page, int numpages)
2079{
2080 unsigned long addr = (unsigned long)page_address(page);
2081
2082 return set_memory_uc(addr, numpages);
2083}
2084EXPORT_SYMBOL(set_pages_uc);
2085
2086static int _set_pages_array(struct page **pages, int numpages,
2087 enum page_cache_mode new_type)
2088{
2089 unsigned long start;
2090 unsigned long end;
2091 enum page_cache_mode set_type;
2092 int i;
2093 int free_idx;
2094 int ret;
2095
2096 for (i = 0; i < numpages; i++) {
2097 if (PageHighMem(pages[i]))
2098 continue;
2099 start = page_to_pfn(pages[i]) << PAGE_SHIFT;
2100 end = start + PAGE_SIZE;
2101 if (reserve_memtype(start, end, new_type, NULL))
2102 goto err_out;
2103 }
2104
2105
2106 set_type = (new_type == _PAGE_CACHE_MODE_WC) ?
2107 _PAGE_CACHE_MODE_UC_MINUS : new_type;
2108
2109 ret = cpa_set_pages_array(pages, numpages,
2110 cachemode2pgprot(set_type));
2111 if (!ret && new_type == _PAGE_CACHE_MODE_WC)
2112 ret = change_page_attr_set_clr(NULL, numpages,
2113 cachemode2pgprot(
2114 _PAGE_CACHE_MODE_WC),
2115 __pgprot(_PAGE_CACHE_MASK),
2116 0, CPA_PAGES_ARRAY, pages);
2117 if (ret)
2118 goto err_out;
2119 return 0;
2120err_out:
2121 free_idx = i;
2122 for (i = 0; i < free_idx; i++) {
2123 if (PageHighMem(pages[i]))
2124 continue;
2125 start = page_to_pfn(pages[i]) << PAGE_SHIFT;
2126 end = start + PAGE_SIZE;
2127 free_memtype(start, end);
2128 }
2129 return -EINVAL;
2130}
2131
2132int set_pages_array_uc(struct page **pages, int numpages)
2133{
2134 return _set_pages_array(pages, numpages, _PAGE_CACHE_MODE_UC_MINUS);
2135}
2136EXPORT_SYMBOL(set_pages_array_uc);
2137
2138int set_pages_array_wc(struct page **pages, int numpages)
2139{
2140 return _set_pages_array(pages, numpages, _PAGE_CACHE_MODE_WC);
2141}
2142EXPORT_SYMBOL(set_pages_array_wc);
2143
2144int set_pages_array_wt(struct page **pages, int numpages)
2145{
2146 return _set_pages_array(pages, numpages, _PAGE_CACHE_MODE_WT);
2147}
2148EXPORT_SYMBOL_GPL(set_pages_array_wt);
2149
2150int set_pages_wb(struct page *page, int numpages)
2151{
2152 unsigned long addr = (unsigned long)page_address(page);
2153
2154 return set_memory_wb(addr, numpages);
2155}
2156EXPORT_SYMBOL(set_pages_wb);
2157
2158int set_pages_array_wb(struct page **pages, int numpages)
2159{
2160 int retval;
2161 unsigned long start;
2162 unsigned long end;
2163 int i;
2164
2165
2166 retval = cpa_clear_pages_array(pages, numpages,
2167 __pgprot(_PAGE_CACHE_MASK));
2168 if (retval)
2169 return retval;
2170
2171 for (i = 0; i < numpages; i++) {
2172 if (PageHighMem(pages[i]))
2173 continue;
2174 start = page_to_pfn(pages[i]) << PAGE_SHIFT;
2175 end = start + PAGE_SIZE;
2176 free_memtype(start, end);
2177 }
2178
2179 return 0;
2180}
2181EXPORT_SYMBOL(set_pages_array_wb);
2182
2183int set_pages_x(struct page *page, int numpages)
2184{
2185 unsigned long addr = (unsigned long)page_address(page);
2186
2187 return set_memory_x(addr, numpages);
2188}
2189EXPORT_SYMBOL(set_pages_x);
2190
2191int set_pages_nx(struct page *page, int numpages)
2192{
2193 unsigned long addr = (unsigned long)page_address(page);
2194
2195 return set_memory_nx(addr, numpages);
2196}
2197EXPORT_SYMBOL(set_pages_nx);
2198
2199int set_pages_ro(struct page *page, int numpages)
2200{
2201 unsigned long addr = (unsigned long)page_address(page);
2202
2203 return set_memory_ro(addr, numpages);
2204}
2205
2206int set_pages_rw(struct page *page, int numpages)
2207{
2208 unsigned long addr = (unsigned long)page_address(page);
2209
2210 return set_memory_rw(addr, numpages);
2211}
2212
2213static int __set_pages_p(struct page *page, int numpages)
2214{
2215 unsigned long tempaddr = (unsigned long) page_address(page);
2216 struct cpa_data cpa = { .vaddr = &tempaddr,
2217 .pgd = NULL,
2218 .numpages = numpages,
2219 .mask_set = __pgprot(_PAGE_PRESENT | _PAGE_RW),
2220 .mask_clr = __pgprot(0),
2221 .flags = 0};
2222
2223
2224
2225
2226
2227
2228
2229 return __change_page_attr_set_clr(&cpa, 0);
2230}
2231
2232static int __set_pages_np(struct page *page, int numpages)
2233{
2234 unsigned long tempaddr = (unsigned long) page_address(page);
2235 struct cpa_data cpa = { .vaddr = &tempaddr,
2236 .pgd = NULL,
2237 .numpages = numpages,
2238 .mask_set = __pgprot(0),
2239 .mask_clr = __pgprot(_PAGE_PRESENT | _PAGE_RW),
2240 .flags = 0};
2241
2242
2243
2244
2245
2246
2247
2248 return __change_page_attr_set_clr(&cpa, 0);
2249}
2250
2251int set_direct_map_invalid_noflush(struct page *page)
2252{
2253 return __set_pages_np(page, 1);
2254}
2255
2256int set_direct_map_default_noflush(struct page *page)
2257{
2258 return __set_pages_p(page, 1);
2259}
2260
2261void __kernel_map_pages(struct page *page, int numpages, int enable)
2262{
2263 if (PageHighMem(page))
2264 return;
2265 if (!enable) {
2266 debug_check_no_locks_freed(page_address(page),
2267 numpages * PAGE_SIZE);
2268 }
2269
2270
2271
2272
2273
2274
2275 if (enable)
2276 __set_pages_p(page, numpages);
2277 else
2278 __set_pages_np(page, numpages);
2279
2280
2281
2282
2283
2284
2285
2286 preempt_disable();
2287 __flush_tlb_all();
2288 preempt_enable();
2289
2290 arch_flush_lazy_mmu_mode();
2291}
2292
2293#ifdef CONFIG_HIBERNATION
2294bool kernel_page_present(struct page *page)
2295{
2296 unsigned int level;
2297 pte_t *pte;
2298
2299 if (PageHighMem(page))
2300 return false;
2301
2302 pte = lookup_address((unsigned long)page_address(page), &level);
2303 return (pte_val(*pte) & _PAGE_PRESENT);
2304}
2305#endif
2306
2307int __init kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
2308 unsigned numpages, unsigned long page_flags)
2309{
2310 int retval = -EINVAL;
2311
2312 struct cpa_data cpa = {
2313 .vaddr = &address,
2314 .pfn = pfn,
2315 .pgd = pgd,
2316 .numpages = numpages,
2317 .mask_set = __pgprot(0),
2318 .mask_clr = __pgprot(0),
2319 .flags = 0,
2320 };
2321
2322 WARN_ONCE(num_online_cpus() > 1, "Don't call after initializing SMP");
2323
2324 if (!(__supported_pte_mask & _PAGE_NX))
2325 goto out;
2326
2327 if (!(page_flags & _PAGE_NX))
2328 cpa.mask_clr = __pgprot(_PAGE_NX);
2329
2330 if (!(page_flags & _PAGE_RW))
2331 cpa.mask_clr = __pgprot(_PAGE_RW);
2332
2333 if (!(page_flags & _PAGE_ENC))
2334 cpa.mask_clr = pgprot_encrypted(cpa.mask_clr);
2335
2336 cpa.mask_set = __pgprot(_PAGE_PRESENT | page_flags);
2337
2338 retval = __change_page_attr_set_clr(&cpa, 0);
2339 __flush_tlb_all();
2340
2341out:
2342 return retval;
2343}
2344
2345
2346
2347
2348
2349
2350int __init kernel_unmap_pages_in_pgd(pgd_t *pgd, unsigned long address,
2351 unsigned long numpages)
2352{
2353 int retval;
2354
2355
2356
2357
2358
2359
2360
2361 struct cpa_data cpa = {
2362 .vaddr = &address,
2363 .pfn = 0,
2364 .pgd = pgd,
2365 .numpages = numpages,
2366 .mask_set = __pgprot(0),
2367 .mask_clr = __pgprot(_PAGE_PRESENT | _PAGE_RW),
2368 .flags = 0,
2369 };
2370
2371 WARN_ONCE(num_online_cpus() > 1, "Don't call after initializing SMP");
2372
2373 retval = __change_page_attr_set_clr(&cpa, 0);
2374 __flush_tlb_all();
2375
2376 return retval;
2377}
2378
2379
2380
2381
2382
2383#ifdef CONFIG_CPA_DEBUG
2384#include "pageattr-test.c"
2385#endif
2386