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Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck...
[linux-block.git] / mm / debug_vm_pgtable.c
CommitLineData
399145f9
AK		 1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This kernel test validates architecture page table helpers and
4 * accessors and helps in verifying their continued compliance with
5 * expected generic MM semantics.
6 *
7 * Copyright (C) 2019 ARM Ltd.
8 *
9 * Author: Anshuman Khandual <anshuman.khandual@arm.com>
10 */
6315df41 11#define pr_fmt(fmt) "debug_vm_pgtable: [%-25s]: " fmt, __func__
399145f9
AK		 12
13#include <linux/gfp.h>
14#include <linux/highmem.h>
15#include <linux/hugetlb.h>
16#include <linux/kernel.h>
17#include <linux/kconfig.h>
18#include <linux/mm.h>
19#include <linux/mman.h>
20#include <linux/mm_types.h>
21#include <linux/module.h>
22#include <linux/pfn_t.h>
23#include <linux/printk.h>
a5c3b9ff 24#include <linux/pgtable.h>
399145f9
AK		 25#include <linux/random.h>
26#include <linux/spinlock.h>
27#include <linux/swap.h>
28#include <linux/swapops.h>
29#include <linux/start_kernel.h>
30#include <linux/sched/mm.h>
85a14463 31#include <linux/io.h>
399145f9 32#include <asm/pgalloc.h>
a5c3b9ff 33#include <asm/tlbflush.h>
399145f9 34
b1d00007
AK		 35/*
36 * Please refer Documentation/vm/arch_pgtable_helpers.rst for the semantics
37 * expectations that are being validated here. All future changes in here
38 * or the documentation need to be in sync.
39 */
40
399145f9
AK		 41#define VMFLAGS (VM_READ|VM_WRITE|VM_EXEC)
42
43/*
44 * On s390 platform, the lower 4 bits are used to identify given page table
45 * entry type. But these bits might affect the ability to clear entries with
46 * pxx_clear() because of how dynamic page table folding works on s390. So
47 * while loading up the entries do not change the lower 4 bits. It does not
cfc5bbc4
AK		 48 * have affect any other platform. Also avoid the 62nd bit on ppc64 that is
49 * used to mark a pte entry.
399145f9 50 */
cfc5bbc4
AK		 51#define S390_SKIP_MASK GENMASK(3, 0)
52#if __BITS_PER_LONG == 64
53#define PPC64_SKIP_MASK GENMASK(62, 62)
54#else
55#define PPC64_SKIP_MASK 0x0
56#endif
57#define ARCH_SKIP_MASK (S390_SKIP_MASK | PPC64_SKIP_MASK)
58#define RANDOM_ORVALUE (GENMASK(BITS_PER_LONG - 1, 0) & ~ARCH_SKIP_MASK)
399145f9
AK		 59#define RANDOM_NZVALUE GENMASK(7, 0)
60
61static void __init pte_basic_tests(unsigned long pfn, pgprot_t prot)
62{
63 pte_t pte = pfn_pte(pfn, prot);
64
6315df41 65 pr_debug("Validating PTE basic\n");
399145f9
AK		 66 WARN_ON(!pte_same(pte, pte));
67 WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte))));
68 WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte))));
69 WARN_ON(!pte_write(pte_mkwrite(pte_wrprotect(pte))));
70 WARN_ON(pte_young(pte_mkold(pte_mkyoung(pte))));
71 WARN_ON(pte_dirty(pte_mkclean(pte_mkdirty(pte))));
72 WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte))));
73}
74
a5c3b9ff
AK		 75static void __init pte_advanced_tests(struct mm_struct *mm,
76 struct vm_area_struct *vma, pte_t *ptep,
77 unsigned long pfn, unsigned long vaddr,
78 pgprot_t prot)
79{
80 pte_t pte = pfn_pte(pfn, prot);
81
c3824e18
AK		 82 /*
83 * Architectures optimize set_pte_at by avoiding TLB flush.
84 * This requires set_pte_at to be not used to update an
85 * existing pte entry. Clear pte before we do set_pte_at
86 */
87
6315df41 88 pr_debug("Validating PTE advanced\n");
a5c3b9ff
AK		 89 pte = pfn_pte(pfn, prot);
90 set_pte_at(mm, vaddr, ptep, pte);
91 ptep_set_wrprotect(mm, vaddr, ptep);
92 pte = ptep_get(ptep);
93 WARN_ON(pte_write(pte));
a5c3b9ff
AK		 94 ptep_get_and_clear(mm, vaddr, ptep);
95 pte = ptep_get(ptep);
96 WARN_ON(!pte_none(pte));
97
98 pte = pfn_pte(pfn, prot);
99 pte = pte_wrprotect(pte);
100 pte = pte_mkclean(pte);
101 set_pte_at(mm, vaddr, ptep, pte);
102 pte = pte_mkwrite(pte);
103 pte = pte_mkdirty(pte);
104 ptep_set_access_flags(vma, vaddr, ptep, pte, 1);
105 pte = ptep_get(ptep);
106 WARN_ON(!(pte_write(pte) && pte_dirty(pte)));
a5c3b9ff
AK		 107 ptep_get_and_clear_full(mm, vaddr, ptep, 1);
108 pte = ptep_get(ptep);
109 WARN_ON(!pte_none(pte));
110
c3824e18 111 pte = pfn_pte(pfn, prot);
a5c3b9ff
AK		 112 pte = pte_mkyoung(pte);
113 set_pte_at(mm, vaddr, ptep, pte);
114 ptep_test_and_clear_young(vma, vaddr, ptep);
115 pte = ptep_get(ptep);
116 WARN_ON(pte_young(pte));
117}
118
119static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot)
120{
121 pte_t pte = pfn_pte(pfn, prot);
122
4200605b
AK		 123 if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
124 return;
125
6315df41 126 pr_debug("Validating PTE saved write\n");
a5c3b9ff
AK		 127 WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte))));
128 WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte))));
129}
4200605b 130
399145f9
AK		 131#ifdef CONFIG_TRANSPARENT_HUGEPAGE
132static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot)
133{
134 pmd_t pmd = pfn_pmd(pfn, prot);
135
787d563b
AK		 136 if (!has_transparent_hugepage())
137 return;
138
6315df41 139 pr_debug("Validating PMD basic\n");
399145f9
AK		 140 WARN_ON(!pmd_same(pmd, pmd));
141 WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd))));
142 WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd))));
143 WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd))));
144 WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd))));
145 WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd))));
146 WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd))));
147 /*
148 * A huge page does not point to next level page table
149 * entry. Hence this must qualify as pmd_bad().
150 */
151 WARN_ON(!pmd_bad(pmd_mkhuge(pmd)));
152}
153
a5c3b9ff
AK		 154static void __init pmd_advanced_tests(struct mm_struct *mm,
155 struct vm_area_struct *vma, pmd_t *pmdp,
156 unsigned long pfn, unsigned long vaddr,
87f34986 157 pgprot_t prot, pgtable_t pgtable)
a5c3b9ff
AK		 158{
159 pmd_t pmd = pfn_pmd(pfn, prot);
160
161 if (!has_transparent_hugepage())
162 return;
163
6315df41 164 pr_debug("Validating PMD advanced\n");
a5c3b9ff
AK		 165 /* Align the address wrt HPAGE_PMD_SIZE */
166 vaddr = (vaddr & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE;
167
87f34986
AK		 168 pgtable_trans_huge_deposit(mm, pmdp, pgtable);
169
a5c3b9ff
AK		 170 pmd = pfn_pmd(pfn, prot);
171 set_pmd_at(mm, vaddr, pmdp, pmd);
172 pmdp_set_wrprotect(mm, vaddr, pmdp);
173 pmd = READ_ONCE(*pmdp);
174 WARN_ON(pmd_write(pmd));
a5c3b9ff
AK		 175 pmdp_huge_get_and_clear(mm, vaddr, pmdp);
176 pmd = READ_ONCE(*pmdp);
177 WARN_ON(!pmd_none(pmd));
178
179 pmd = pfn_pmd(pfn, prot);
180 pmd = pmd_wrprotect(pmd);
181 pmd = pmd_mkclean(pmd);
182 set_pmd_at(mm, vaddr, pmdp, pmd);
183 pmd = pmd_mkwrite(pmd);
184 pmd = pmd_mkdirty(pmd);
185 pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1);
186 pmd = READ_ONCE(*pmdp);
187 WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd)));
a5c3b9ff
AK		 188 pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1);
189 pmd = READ_ONCE(*pmdp);
190 WARN_ON(!pmd_none(pmd));
191
c3824e18 192 pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
a5c3b9ff
AK		 193 pmd = pmd_mkyoung(pmd);
194 set_pmd_at(mm, vaddr, pmdp, pmd);
195 pmdp_test_and_clear_young(vma, vaddr, pmdp);
196 pmd = READ_ONCE(*pmdp);
197 WARN_ON(pmd_young(pmd));
87f34986 198
13af0506
AK		 199 /* Clear the pte entries */
200 pmdp_huge_get_and_clear(mm, vaddr, pmdp);
87f34986 201 pgtable = pgtable_trans_huge_withdraw(mm, pmdp);
a5c3b9ff
AK		 202}
203
204static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot)
205{
206 pmd_t pmd = pfn_pmd(pfn, prot);
207
6315df41 208 pr_debug("Validating PMD leaf\n");
a5c3b9ff
AK		 209 /*
210 * PMD based THP is a leaf entry.
211 */
212 pmd = pmd_mkhuge(pmd);
213 WARN_ON(!pmd_leaf(pmd));
214}
215
85a14463 216#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
a5c3b9ff
AK		 217static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
218{
219 pmd_t pmd;
220
85a14463 221 if (!arch_ioremap_pmd_supported())
a5c3b9ff 222 return;
6315df41
AK		 223
224 pr_debug("Validating PMD huge\n");
a5c3b9ff
AK		 225 /*
226 * X86 defined pmd_set_huge() verifies that the given
227 * PMD is not a populated non-leaf entry.
228 */
229 WRITE_ONCE(*pmdp, __pmd(0));
230 WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot));
231 WARN_ON(!pmd_clear_huge(pmdp));
232 pmd = READ_ONCE(*pmdp);
233 WARN_ON(!pmd_none(pmd));
234}
85a14463
AK		 235#else /* CONFIG_HAVE_ARCH_HUGE_VMAP */
236static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) { }
237#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
a5c3b9ff
AK		 238
239static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot)
240{
241 pmd_t pmd = pfn_pmd(pfn, prot);
242
4200605b
AK		 243 if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
244 return;
245
6315df41 246 pr_debug("Validating PMD saved write\n");
a5c3b9ff
AK		 247 WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd))));
248 WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd))));
249}
250
399145f9
AK		 251#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
252static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot)
253{
254 pud_t pud = pfn_pud(pfn, prot);
255
787d563b
AK		 256 if (!has_transparent_hugepage())
257 return;
258
6315df41 259 pr_debug("Validating PUD basic\n");
399145f9
AK		 260 WARN_ON(!pud_same(pud, pud));
261 WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud))));
262 WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud))));
263 WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud))));
264 WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud))));
265
266 if (mm_pmd_folded(mm))
267 return;
268
269 /*
270 * A huge page does not point to next level page table
271 * entry. Hence this must qualify as pud_bad().
272 */
273 WARN_ON(!pud_bad(pud_mkhuge(pud)));
274}
a5c3b9ff
AK		 275
276static void __init pud_advanced_tests(struct mm_struct *mm,
277 struct vm_area_struct *vma, pud_t *pudp,
278 unsigned long pfn, unsigned long vaddr,
279 pgprot_t prot)
280{
281 pud_t pud = pfn_pud(pfn, prot);
282
283 if (!has_transparent_hugepage())
284 return;
285
6315df41 286 pr_debug("Validating PUD advanced\n");
a5c3b9ff
AK		 287 /* Align the address wrt HPAGE_PUD_SIZE */
288 vaddr = (vaddr & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE;
289
290 set_pud_at(mm, vaddr, pudp, pud);
291 pudp_set_wrprotect(mm, vaddr, pudp);
292 pud = READ_ONCE(*pudp);
293 WARN_ON(pud_write(pud));
294
295#ifndef __PAGETABLE_PMD_FOLDED
a5c3b9ff
AK		 296 pudp_huge_get_and_clear(mm, vaddr, pudp);
297 pud = READ_ONCE(*pudp);
298 WARN_ON(!pud_none(pud));
a5c3b9ff
AK		 299#endif /* __PAGETABLE_PMD_FOLDED */
300 pud = pfn_pud(pfn, prot);
301 pud = pud_wrprotect(pud);
302 pud = pud_mkclean(pud);
303 set_pud_at(mm, vaddr, pudp, pud);
304 pud = pud_mkwrite(pud);
305 pud = pud_mkdirty(pud);
306 pudp_set_access_flags(vma, vaddr, pudp, pud, 1);
307 pud = READ_ONCE(*pudp);
308 WARN_ON(!(pud_write(pud) && pud_dirty(pud)));
309
c3824e18
AK		 310#ifndef __PAGETABLE_PMD_FOLDED
311 pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1);
312 pud = READ_ONCE(*pudp);
313 WARN_ON(!pud_none(pud));
314#endif /* __PAGETABLE_PMD_FOLDED */
315
316 pud = pfn_pud(pfn, prot);
a5c3b9ff
AK		 317 pud = pud_mkyoung(pud);
318 set_pud_at(mm, vaddr, pudp, pud);
319 pudp_test_and_clear_young(vma, vaddr, pudp);
320 pud = READ_ONCE(*pudp);
321 WARN_ON(pud_young(pud));
13af0506
AK		 322
323 pudp_huge_get_and_clear(mm, vaddr, pudp);
a5c3b9ff
AK		 324}
325
326static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot)
327{
328 pud_t pud = pfn_pud(pfn, prot);
329
6315df41 330 pr_debug("Validating PUD leaf\n");
a5c3b9ff
AK		 331 /*
332 * PUD based THP is a leaf entry.
333 */
334 pud = pud_mkhuge(pud);
335 WARN_ON(!pud_leaf(pud));
336}
337
85a14463 338#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
a5c3b9ff
AK		 339static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
340{
341 pud_t pud;
342
85a14463 343 if (!arch_ioremap_pud_supported())
a5c3b9ff 344 return;
6315df41
AK		 345
346 pr_debug("Validating PUD huge\n");
a5c3b9ff
AK		 347 /*
348 * X86 defined pud_set_huge() verifies that the given
349 * PUD is not a populated non-leaf entry.
350 */
351 WRITE_ONCE(*pudp, __pud(0));
352 WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot));
353 WARN_ON(!pud_clear_huge(pudp));
354 pud = READ_ONCE(*pudp);
355 WARN_ON(!pud_none(pud));
356}
85a14463
AK		 357#else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
358static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { }
359#endif /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
360
399145f9
AK		 361#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
362static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) { }
a5c3b9ff
AK		 363static void __init pud_advanced_tests(struct mm_struct *mm,
364 struct vm_area_struct *vma, pud_t *pudp,
365 unsigned long pfn, unsigned long vaddr,
366 pgprot_t prot)
367{
368}
369static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { }
370static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
371{
372}
399145f9
AK		 373#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
374#else /* !CONFIG_TRANSPARENT_HUGEPAGE */
375static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot) { }
376static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) { }
a5c3b9ff
AK		 377static void __init pmd_advanced_tests(struct mm_struct *mm,
378 struct vm_area_struct *vma, pmd_t *pmdp,
379 unsigned long pfn, unsigned long vaddr,
87f34986 380 pgprot_t prot, pgtable_t pgtable)
a5c3b9ff
AK		 381{
382}
383static void __init pud_advanced_tests(struct mm_struct *mm,
384 struct vm_area_struct *vma, pud_t *pudp,
385 unsigned long pfn, unsigned long vaddr,
386 pgprot_t prot)
387{
388}
389static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { }
390static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { }
391static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
392{
393}
394static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
395{
396}
397static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { }
399145f9
AK		 398#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
399
400static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot)
401{
402 p4d_t p4d;
403
6315df41 404 pr_debug("Validating P4D basic\n");
399145f9
AK		 405 memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t));
406 WARN_ON(!p4d_same(p4d, p4d));
407}
408
409static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot)
410{
411 pgd_t pgd;
412
6315df41 413 pr_debug("Validating PGD basic\n");
399145f9
AK		 414 memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t));
415 WARN_ON(!pgd_same(pgd, pgd));
416}
417
418#ifndef __PAGETABLE_PUD_FOLDED
419static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp)
420{
421 pud_t pud = READ_ONCE(*pudp);
422
423 if (mm_pmd_folded(mm))
424 return;
425
6315df41 426 pr_debug("Validating PUD clear\n");
399145f9
AK		 427 pud = __pud(pud_val(pud) | RANDOM_ORVALUE);
428 WRITE_ONCE(*pudp, pud);
429 pud_clear(pudp);
430 pud = READ_ONCE(*pudp);
431 WARN_ON(!pud_none(pud));
432}
433
434static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp,
435 pmd_t *pmdp)
436{
437 pud_t pud;
438
439 if (mm_pmd_folded(mm))
440 return;
6315df41
AK		 441
442 pr_debug("Validating PUD populate\n");
399145f9
AK		 443 /*
444 * This entry points to next level page table page.
445 * Hence this must not qualify as pud_bad().
446 */
399145f9
AK		 447 pud_populate(mm, pudp, pmdp);
448 pud = READ_ONCE(*pudp);
449 WARN_ON(pud_bad(pud));
450}
451#else /* !__PAGETABLE_PUD_FOLDED */
452static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) { }
453static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp,
454 pmd_t *pmdp)
455{
456}
457#endif /* PAGETABLE_PUD_FOLDED */
458
459#ifndef __PAGETABLE_P4D_FOLDED
460static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp)
461{
462 p4d_t p4d = READ_ONCE(*p4dp);
463
464 if (mm_pud_folded(mm))
465 return;
466
6315df41 467 pr_debug("Validating P4D clear\n");
399145f9
AK		 468 p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE);
469 WRITE_ONCE(*p4dp, p4d);
470 p4d_clear(p4dp);
471 p4d = READ_ONCE(*p4dp);
472 WARN_ON(!p4d_none(p4d));
473}
474
475static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
476 pud_t *pudp)
477{
478 p4d_t p4d;
479
480 if (mm_pud_folded(mm))
481 return;
482
6315df41 483 pr_debug("Validating P4D populate\n");
399145f9
AK		 484 /*
485 * This entry points to next level page table page.
486 * Hence this must not qualify as p4d_bad().
487 */
488 pud_clear(pudp);
489 p4d_clear(p4dp);
490 p4d_populate(mm, p4dp, pudp);
491 p4d = READ_ONCE(*p4dp);
492 WARN_ON(p4d_bad(p4d));
493}
494
495static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp)
496{
497 pgd_t pgd = READ_ONCE(*pgdp);
498
499 if (mm_p4d_folded(mm))
500 return;
501
6315df41 502 pr_debug("Validating PGD clear\n");
399145f9
AK		 503 pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE);
504 WRITE_ONCE(*pgdp, pgd);
505 pgd_clear(pgdp);
506 pgd = READ_ONCE(*pgdp);
507 WARN_ON(!pgd_none(pgd));
508}
509
510static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
511 p4d_t *p4dp)
512{
513 pgd_t pgd;
514
515 if (mm_p4d_folded(mm))
516 return;
517
6315df41 518 pr_debug("Validating PGD populate\n");
399145f9
AK		 519 /*
520 * This entry points to next level page table page.
521 * Hence this must not qualify as pgd_bad().
522 */
523 p4d_clear(p4dp);
524 pgd_clear(pgdp);
525 pgd_populate(mm, pgdp, p4dp);
526 pgd = READ_ONCE(*pgdp);
527 WARN_ON(pgd_bad(pgd));
528}
529#else /* !__PAGETABLE_P4D_FOLDED */
530static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { }
531static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { }
532static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
533 pud_t *pudp)
534{
535}
536static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
537 p4d_t *p4dp)
538{
539}
540#endif /* PAGETABLE_P4D_FOLDED */
541
542static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep,
401035d5
AK		 543 unsigned long pfn, unsigned long vaddr,
544 pgprot_t prot)
399145f9 545{
401035d5 546 pte_t pte = pfn_pte(pfn, prot);
399145f9 547
6315df41 548 pr_debug("Validating PTE clear\n");
401035d5 549#ifndef CONFIG_RISCV
399145f9 550 pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
401035d5 551#endif
399145f9
AK		 552 set_pte_at(mm, vaddr, ptep, pte);
553 barrier();
554 pte_clear(mm, vaddr, ptep);
9449c9cb 555 pte = ptep_get(ptep);
399145f9
AK		 556 WARN_ON(!pte_none(pte));
557}
558
559static void __init pmd_clear_tests(struct mm_struct *mm, pmd_t *pmdp)
560{
561 pmd_t pmd = READ_ONCE(*pmdp);
562
6315df41 563 pr_debug("Validating PMD clear\n");
399145f9
AK		 564 pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE);
565 WRITE_ONCE(*pmdp, pmd);
566 pmd_clear(pmdp);
567 pmd = READ_ONCE(*pmdp);
568 WARN_ON(!pmd_none(pmd));
569}
570
571static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp,
572 pgtable_t pgtable)
573{
574 pmd_t pmd;
575
6315df41 576 pr_debug("Validating PMD populate\n");
399145f9
AK		 577 /*
578 * This entry points to next level page table page.
579 * Hence this must not qualify as pmd_bad().
580 */
399145f9
AK		 581 pmd_populate(mm, pmdp, pgtable);
582 pmd = READ_ONCE(*pmdp);
583 WARN_ON(pmd_bad(pmd));
584}
585
05289402
AK		 586static void __init pte_special_tests(unsigned long pfn, pgprot_t prot)
587{
588 pte_t pte = pfn_pte(pfn, prot);
589
590 if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL))
591 return;
592
6315df41 593 pr_debug("Validating PTE special\n");
05289402
AK		 594 WARN_ON(!pte_special(pte_mkspecial(pte)));
595}
596
597static void __init pte_protnone_tests(unsigned long pfn, pgprot_t prot)
598{
599 pte_t pte = pfn_pte(pfn, prot);
600
601 if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
602 return;
603
6315df41 604 pr_debug("Validating PTE protnone\n");
05289402
AK		 605 WARN_ON(!pte_protnone(pte));
606 WARN_ON(!pte_present(pte));
607}
608
609#ifdef CONFIG_TRANSPARENT_HUGEPAGE
610static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot)
611{
612 pmd_t pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
613
614 if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
615 return;
616
6315df41 617 pr_debug("Validating PMD protnone\n");
05289402
AK		 618 WARN_ON(!pmd_protnone(pmd));
619 WARN_ON(!pmd_present(pmd));
620}
621#else /* !CONFIG_TRANSPARENT_HUGEPAGE */
622static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) { }
623#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
624
625#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
626static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot)
627{
628 pte_t pte = pfn_pte(pfn, prot);
629
6315df41 630 pr_debug("Validating PTE devmap\n");
05289402
AK		 631 WARN_ON(!pte_devmap(pte_mkdevmap(pte)));
632}
633
634#ifdef CONFIG_TRANSPARENT_HUGEPAGE
635static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot)
636{
637 pmd_t pmd = pfn_pmd(pfn, prot);
638
6315df41 639 pr_debug("Validating PMD devmap\n");
05289402
AK		 640 WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd)));
641}
642
643#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
644static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot)
645{
646 pud_t pud = pfn_pud(pfn, prot);
647
6315df41 648 pr_debug("Validating PUD devmap\n");
05289402
AK		 649 WARN_ON(!pud_devmap(pud_mkdevmap(pud)));
650}
651#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
652static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
653#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
654#else /* CONFIG_TRANSPARENT_HUGEPAGE */
655static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { }
656static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
657#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
658#else
659static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) { }
660static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { }
661static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
662#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */
663
664static void __init pte_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
665{
666 pte_t pte = pfn_pte(pfn, prot);
667
668 if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
669 return;
670
6315df41 671 pr_debug("Validating PTE soft dirty\n");
05289402
AK		 672 WARN_ON(!pte_soft_dirty(pte_mksoft_dirty(pte)));
673 WARN_ON(pte_soft_dirty(pte_clear_soft_dirty(pte)));
674}
675
676static void __init pte_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
677{
678 pte_t pte = pfn_pte(pfn, prot);
679
680 if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
681 return;
682
6315df41 683 pr_debug("Validating PTE swap soft dirty\n");
05289402
AK		 684 WARN_ON(!pte_swp_soft_dirty(pte_swp_mksoft_dirty(pte)));
685 WARN_ON(pte_swp_soft_dirty(pte_swp_clear_soft_dirty(pte)));
686}
687
688#ifdef CONFIG_TRANSPARENT_HUGEPAGE
689static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
690{
691 pmd_t pmd = pfn_pmd(pfn, prot);
692
693 if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
694 return;
695
6315df41 696 pr_debug("Validating PMD soft dirty\n");
05289402
AK		 697 WARN_ON(!pmd_soft_dirty(pmd_mksoft_dirty(pmd)));
698 WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd)));
699}
700
701static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
702{
703 pmd_t pmd = pfn_pmd(pfn, prot);
704
705 if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) ||
706 !IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION))
707 return;
708
6315df41 709 pr_debug("Validating PMD swap soft dirty\n");
05289402
AK		 710 WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd)));
711 WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd)));
712}
713#else /* !CONFIG_ARCH_HAS_PTE_DEVMAP */
714static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) { }
715static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
716{
717}
718#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */
719
720static void __init pte_swap_tests(unsigned long pfn, pgprot_t prot)
721{
722 swp_entry_t swp;
723 pte_t pte;
724
6315df41 725 pr_debug("Validating PTE swap\n");
05289402
AK		 726 pte = pfn_pte(pfn, prot);
727 swp = __pte_to_swp_entry(pte);
728 pte = __swp_entry_to_pte(swp);
729 WARN_ON(pfn != pte_pfn(pte));
730}
731
732#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
733static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot)
734{
735 swp_entry_t swp;
736 pmd_t pmd;
737
6315df41 738 pr_debug("Validating PMD swap\n");
05289402
AK		 739 pmd = pfn_pmd(pfn, prot);
740 swp = __pmd_to_swp_entry(pmd);
741 pmd = __swp_entry_to_pmd(swp);
742 WARN_ON(pfn != pmd_pfn(pmd));
743}
744#else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */
745static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { }
746#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
747
748static void __init swap_migration_tests(void)
749{
750 struct page *page;
751 swp_entry_t swp;
752
753 if (!IS_ENABLED(CONFIG_MIGRATION))
754 return;
6315df41
AK		 755
756 pr_debug("Validating swap migration\n");
05289402
AK		 757 /*
758 * swap_migration_tests() requires a dedicated page as it needs to
759 * be locked before creating a migration entry from it. Locking the
760 * page that actually maps kernel text ('start_kernel') can be real
761 * problematic. Lets allocate a dedicated page explicitly for this
762 * purpose that will be freed subsequently.
763 */
764 page = alloc_page(GFP_KERNEL);
765 if (!page) {
766 pr_err("page allocation failed\n");
767 return;
768 }
769
770 /*
771 * make_migration_entry() expects given page to be
772 * locked, otherwise it stumbles upon a BUG_ON().
773 */
774 __SetPageLocked(page);
775 swp = make_migration_entry(page, 1);
776 WARN_ON(!is_migration_entry(swp));
777 WARN_ON(!is_write_migration_entry(swp));
778
779 make_migration_entry_read(&swp);
780 WARN_ON(!is_migration_entry(swp));
781 WARN_ON(is_write_migration_entry(swp));
782
783 swp = make_migration_entry(page, 0);
784 WARN_ON(!is_migration_entry(swp));
785 WARN_ON(is_write_migration_entry(swp));
786 __ClearPageLocked(page);
787 __free_page(page);
788}
789
790#ifdef CONFIG_HUGETLB_PAGE
791static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot)
792{
793 struct page *page;
794 pte_t pte;
795
6315df41 796 pr_debug("Validating HugeTLB basic\n");
05289402
AK		 797 /*
798 * Accessing the page associated with the pfn is safe here,
799 * as it was previously derived from a real kernel symbol.
800 */
801 page = pfn_to_page(pfn);
802 pte = mk_huge_pte(page, prot);
803
804 WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte)));
805 WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte))));
806 WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte))));
807
808#ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB
809 pte = pfn_pte(pfn, prot);
810
811 WARN_ON(!pte_huge(pte_mkhuge(pte)));
812#endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
813}
814#else /* !CONFIG_HUGETLB_PAGE */
815static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { }
816#endif /* CONFIG_HUGETLB_PAGE */
817
818#ifdef CONFIG_TRANSPARENT_HUGEPAGE
819static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot)
820{
821 pmd_t pmd;
822
823 if (!has_transparent_hugepage())
824 return;
825
6315df41 826 pr_debug("Validating PMD based THP\n");
05289402
AK		 827 /*
828 * pmd_trans_huge() and pmd_present() must return positive after
829 * MMU invalidation with pmd_mkinvalid(). This behavior is an
830 * optimization for transparent huge page. pmd_trans_huge() must
831 * be true if pmd_page() returns a valid THP to avoid taking the
832 * pmd_lock when others walk over non transhuge pmds (i.e. there
833 * are no THP allocated). Especially when splitting a THP and
834 * removing the present bit from the pmd, pmd_trans_huge() still
835 * needs to return true. pmd_present() should be true whenever
836 * pmd_trans_huge() returns true.
837 */
838 pmd = pfn_pmd(pfn, prot);
839 WARN_ON(!pmd_trans_huge(pmd_mkhuge(pmd)));
840
841#ifndef __HAVE_ARCH_PMDP_INVALIDATE
842 WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd))));
843 WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd))));
844#endif /* __HAVE_ARCH_PMDP_INVALIDATE */
845}
846
847#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
848static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot)
849{
850 pud_t pud;
851
852 if (!has_transparent_hugepage())
853 return;
854
6315df41 855 pr_debug("Validating PUD based THP\n");
05289402
AK		 856 pud = pfn_pud(pfn, prot);
857 WARN_ON(!pud_trans_huge(pud_mkhuge(pud)));
858
859 /*
860 * pud_mkinvalid() has been dropped for now. Enable back
861 * these tests when it comes back with a modified pud_present().
862 *
863 * WARN_ON(!pud_trans_huge(pud_mkinvalid(pud_mkhuge(pud))));
864 * WARN_ON(!pud_present(pud_mkinvalid(pud_mkhuge(pud))));
865 */
866}
867#else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
868static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { }
869#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
870#else /* !CONFIG_TRANSPARENT_HUGEPAGE */
871static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) { }
872static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { }
873#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
874
399145f9
AK		 875static unsigned long __init get_random_vaddr(void)
876{
877 unsigned long random_vaddr, random_pages, total_user_pages;
878
879 total_user_pages = (TASK_SIZE - FIRST_USER_ADDRESS) / PAGE_SIZE;
880
881 random_pages = get_random_long() % total_user_pages;
882 random_vaddr = FIRST_USER_ADDRESS + random_pages * PAGE_SIZE;
883
884 return random_vaddr;
885}
886
887static int __init debug_vm_pgtable(void)
888{
a5c3b9ff 889 struct vm_area_struct *vma;
399145f9
AK		 890 struct mm_struct *mm;
891 pgd_t *pgdp;
892 p4d_t *p4dp, *saved_p4dp;
893 pud_t *pudp, *saved_pudp;
894 pmd_t *pmdp, *saved_pmdp, pmd;
895 pte_t *ptep;
896 pgtable_t saved_ptep;
05289402 897 pgprot_t prot, protnone;
399145f9
AK		 898 phys_addr_t paddr;
899 unsigned long vaddr, pte_aligned, pmd_aligned;
900 unsigned long pud_aligned, p4d_aligned, pgd_aligned;
fea1120c 901 spinlock_t *ptl = NULL;
399145f9
AK		 902
903 pr_info("Validating architecture page table helpers\n");
904 prot = vm_get_page_prot(VMFLAGS);
905 vaddr = get_random_vaddr();
906 mm = mm_alloc();
907 if (!mm) {
908 pr_err("mm_struct allocation failed\n");
909 return 1;
910 }
911
05289402
AK		 912 /*
913 * __P000 (or even __S000) will help create page table entries with
914 * PROT_NONE permission as required for pxx_protnone_tests().
915 */
916 protnone = __P000;
917
a5c3b9ff
AK		 918 vma = vm_area_alloc(mm);
919 if (!vma) {
920 pr_err("vma allocation failed\n");
921 return 1;
922 }
923
399145f9
AK		 924 /*
925 * PFN for mapping at PTE level is determined from a standard kernel
926 * text symbol. But pfns for higher page table levels are derived by
927 * masking lower bits of this real pfn. These derived pfns might not
928 * exist on the platform but that does not really matter as pfn_pxx()
929 * helpers will still create appropriate entries for the test. This
930 * helps avoid large memory block allocations to be used for mapping
931 * at higher page table levels.
932 */
933 paddr = __pa_symbol(&start_kernel);
934
935 pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT;
936 pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT;
937 pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT;
938 p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT;
939 pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT;
940 WARN_ON(!pfn_valid(pte_aligned));
941
942 pgdp = pgd_offset(mm, vaddr);
943 p4dp = p4d_alloc(mm, pgdp, vaddr);
944 pudp = pud_alloc(mm, p4dp, vaddr);
945 pmdp = pmd_alloc(mm, pudp, vaddr);
f14312e1
AK		 946 /*
947 * Allocate pgtable_t
948 */
949 if (pte_alloc(mm, pmdp)) {
950 pr_err("pgtable allocation failed\n");
951 return 1;
952 }
399145f9
AK		 953
954 /*
955 * Save all the page table page addresses as the page table
956 * entries will be used for testing with random or garbage
957 * values. These saved addresses will be used for freeing
958 * page table pages.
959 */
960 pmd = READ_ONCE(*pmdp);
961 saved_p4dp = p4d_offset(pgdp, 0UL);
962 saved_pudp = pud_offset(p4dp, 0UL);
963 saved_pmdp = pmd_offset(pudp, 0UL);
964 saved_ptep = pmd_pgtable(pmd);
965
966 pte_basic_tests(pte_aligned, prot);
967 pmd_basic_tests(pmd_aligned, prot);
968 pud_basic_tests(pud_aligned, prot);
969 p4d_basic_tests(p4d_aligned, prot);
970 pgd_basic_tests(pgd_aligned, prot);
971
a5c3b9ff
AK		 972 pmd_leaf_tests(pmd_aligned, prot);
973 pud_leaf_tests(pud_aligned, prot);
974
4200605b
AK		 975 pte_savedwrite_tests(pte_aligned, protnone);
976 pmd_savedwrite_tests(pmd_aligned, protnone);
a5c3b9ff 977
05289402
AK		 978 pte_special_tests(pte_aligned, prot);
979 pte_protnone_tests(pte_aligned, protnone);
980 pmd_protnone_tests(pmd_aligned, protnone);
981
982 pte_devmap_tests(pte_aligned, prot);
983 pmd_devmap_tests(pmd_aligned, prot);
984 pud_devmap_tests(pud_aligned, prot);
985
986 pte_soft_dirty_tests(pte_aligned, prot);
987 pmd_soft_dirty_tests(pmd_aligned, prot);
988 pte_swap_soft_dirty_tests(pte_aligned, prot);
989 pmd_swap_soft_dirty_tests(pmd_aligned, prot);
990
991 pte_swap_tests(pte_aligned, prot);
992 pmd_swap_tests(pmd_aligned, prot);
993
994 swap_migration_tests();
05289402
AK		 995
996 pmd_thp_tests(pmd_aligned, prot);
997 pud_thp_tests(pud_aligned, prot);
998
e8edf0ad
AK		 999 hugetlb_basic_tests(pte_aligned, prot);
1000
6f302e27
AK		 1001 /*
1002 * Page table modifying tests. They need to hold
1003 * proper page table lock.
1004 */
e8edf0ad 1005
f14312e1 1006 ptep = pte_offset_map_lock(mm, pmdp, vaddr, &ptl);
401035d5 1007 pte_clear_tests(mm, ptep, pte_aligned, vaddr, prot);
e8edf0ad 1008 pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
6f302e27 1009 pte_unmap_unlock(ptep, ptl);
e8edf0ad 1010
6f302e27
AK		 1011 ptl = pmd_lock(mm, pmdp);
1012 pmd_clear_tests(mm, pmdp);
87f34986 1013 pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot, saved_ptep);
e8edf0ad 1014 pmd_huge_tests(pmdp, pmd_aligned, prot);
6f302e27
AK		 1015 pmd_populate_tests(mm, pmdp, saved_ptep);
1016 spin_unlock(ptl);
1017
1018 ptl = pud_lock(mm, pudp);
1019 pud_clear_tests(mm, pudp);
1020 pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot);
e8edf0ad 1021 pud_huge_tests(pudp, pud_aligned, prot);
6f302e27
AK		 1022 pud_populate_tests(mm, pudp, saved_pmdp);
1023 spin_unlock(ptl);
e8edf0ad 1024
6f302e27
AK		 1025 spin_lock(&mm->page_table_lock);
1026 p4d_clear_tests(mm, p4dp);
1027 pgd_clear_tests(mm, pgdp);
e8edf0ad
AK		 1028 p4d_populate_tests(mm, p4dp, saved_pudp);
1029 pgd_populate_tests(mm, pgdp, saved_p4dp);
6f302e27 1030 spin_unlock(&mm->page_table_lock);
e8edf0ad 1031
399145f9
AK		 1032 p4d_free(mm, saved_p4dp);
1033 pud_free(mm, saved_pudp);
1034 pmd_free(mm, saved_pmdp);
1035 pte_free(mm, saved_ptep);
1036
a5c3b9ff 1037 vm_area_free(vma);
399145f9
AK		 1038 mm_dec_nr_puds(mm);
1039 mm_dec_nr_pmds(mm);
1040 mm_dec_nr_ptes(mm);
1041 mmdrop(mm);
1042 return 0;
1043}
1044late_initcall(debug_vm_pgtable);
Linux 6.x block layer and io_uring tree(s)