mm/debug_vm_pgtable.c

   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  */
  11 #define pr_fmt(fmt) "debug_vm_pgtable: [%-25s]: " fmt, __func__
  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>
  24 #include <linux/pgtable.h>
  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>
  31 #include <linux/io.h>
  32 #include <asm/pgalloc.h>
  33 #include <asm/tlbflush.h>
  34
  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
  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
  48  * have affect any other platform. Also avoid the 62nd bit on ppc64 that is
  49  * used to mark a pte entry.
  50  */
  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)
  59 #define RANDOM_NZVALUE  GENMASK(7, 0)
  60
  61 static void __init pte_basic_tests(unsigned long pfn, int idx)
  62 {
  63         pgprot_t prot = protection_map[idx];
  64         pte_t pte = pfn_pte(pfn, prot);
  65         unsigned long val = idx, *ptr = &val;
  66
  67         pr_debug("Validating PTE basic (%pGv)\n", ptr);
  68
  69         /*
  70          * This test needs to be executed after the given page table entry
  71          * is created with pfn_pte() to make sure that protection_map[idx]
  72          * does not have the dirty bit enabled from the beginning. This is
  73          * important for platforms like arm64 where (!PTE_RDONLY) indicate
  74          * dirty bit being set.
  75          */
  76         WARN_ON(pte_dirty(pte_wrprotect(pte)));
  77
  78         WARN_ON(!pte_same(pte, pte));
  79         WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte))));
  80         WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte))));
  81         WARN_ON(!pte_write(pte_mkwrite(pte_wrprotect(pte))));
  82         WARN_ON(pte_young(pte_mkold(pte_mkyoung(pte))));
  83         WARN_ON(pte_dirty(pte_mkclean(pte_mkdirty(pte))));
  84         WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte))));
  85         WARN_ON(pte_dirty(pte_wrprotect(pte_mkclean(pte))));
  86         WARN_ON(!pte_dirty(pte_wrprotect(pte_mkdirty(pte))));
  87 }
  88
  89 static void __init pte_advanced_tests(struct mm_struct *mm,
  90                                       struct vm_area_struct *vma, pte_t *ptep,
  91                                       unsigned long pfn, unsigned long vaddr,
  92                                       pgprot_t prot)
  93 {
  94         pte_t pte = pfn_pte(pfn, prot);
  95
  96         /*
  97          * Architectures optimize set_pte_at by avoiding TLB flush.
  98          * This requires set_pte_at to be not used to update an
  99          * existing pte entry. Clear pte before we do set_pte_at
 100          */
 101
 102         pr_debug("Validating PTE advanced\n");
 103         pte = pfn_pte(pfn, prot);
 104         set_pte_at(mm, vaddr, ptep, pte);
 105         ptep_set_wrprotect(mm, vaddr, ptep);
 106         pte = ptep_get(ptep);
 107         WARN_ON(pte_write(pte));
 108         ptep_get_and_clear(mm, vaddr, ptep);
 109         pte = ptep_get(ptep);
 110         WARN_ON(!pte_none(pte));
 111
 112         pte = pfn_pte(pfn, prot);
 113         pte = pte_wrprotect(pte);
 114         pte = pte_mkclean(pte);
 115         set_pte_at(mm, vaddr, ptep, pte);
 116         pte = pte_mkwrite(pte);
 117         pte = pte_mkdirty(pte);
 118         ptep_set_access_flags(vma, vaddr, ptep, pte, 1);
 119         pte = ptep_get(ptep);
 120         WARN_ON(!(pte_write(pte) && pte_dirty(pte)));
 121         ptep_get_and_clear_full(mm, vaddr, ptep, 1);
 122         pte = ptep_get(ptep);
 123         WARN_ON(!pte_none(pte));
 124
 125         pte = pfn_pte(pfn, prot);
 126         pte = pte_mkyoung(pte);
 127         set_pte_at(mm, vaddr, ptep, pte);
 128         ptep_test_and_clear_young(vma, vaddr, ptep);
 129         pte = ptep_get(ptep);
 130         WARN_ON(pte_young(pte));
 131 }
 132
 133 static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot)
 134 {
 135         pte_t pte = pfn_pte(pfn, prot);
 136
 137         if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
 138                 return;
 139
 140         pr_debug("Validating PTE saved write\n");
 141         WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte))));
 142         WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte))));
 143 }
 144
 145 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 146 static void __init pmd_basic_tests(unsigned long pfn, int idx)
 147 {
 148         pgprot_t prot = protection_map[idx];
 149         unsigned long val = idx, *ptr = &val;
 150         pmd_t pmd;
 151
 152         if (!has_transparent_hugepage())
 153                 return;
 154
 155         pr_debug("Validating PMD basic (%pGv)\n", ptr);
 156         pmd = pfn_pmd(pfn, prot);
 157
 158         /*
 159          * This test needs to be executed after the given page table entry
 160          * is created with pfn_pmd() to make sure that protection_map[idx]
 161          * does not have the dirty bit enabled from the beginning. This is
 162          * important for platforms like arm64 where (!PTE_RDONLY) indicate
 163          * dirty bit being set.
 164          */
 165         WARN_ON(pmd_dirty(pmd_wrprotect(pmd)));
 166
 167
 168         WARN_ON(!pmd_same(pmd, pmd));
 169         WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd))));
 170         WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd))));
 171         WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd))));
 172         WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd))));
 173         WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd))));
 174         WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd))));
 175         WARN_ON(pmd_dirty(pmd_wrprotect(pmd_mkclean(pmd))));
 176         WARN_ON(!pmd_dirty(pmd_wrprotect(pmd_mkdirty(pmd))));
 177         /*
 178          * A huge page does not point to next level page table
 179          * entry. Hence this must qualify as pmd_bad().
 180          */
 181         WARN_ON(!pmd_bad(pmd_mkhuge(pmd)));
 182 }
 183
 184 static void __init pmd_advanced_tests(struct mm_struct *mm,
 185                                       struct vm_area_struct *vma, pmd_t *pmdp,
 186                                       unsigned long pfn, unsigned long vaddr,
 187                                       pgprot_t prot, pgtable_t pgtable)
 188 {
 189         pmd_t pmd;
 190
 191         if (!has_transparent_hugepage())
 192                 return;
 193
 194         pr_debug("Validating PMD advanced\n");
 195         /* Align the address wrt HPAGE_PMD_SIZE */
 196         vaddr &= HPAGE_PMD_MASK;
 197
 198         pgtable_trans_huge_deposit(mm, pmdp, pgtable);
 199
 200         pmd = pfn_pmd(pfn, prot);
 201         set_pmd_at(mm, vaddr, pmdp, pmd);
 202         pmdp_set_wrprotect(mm, vaddr, pmdp);
 203         pmd = READ_ONCE(*pmdp);
 204         WARN_ON(pmd_write(pmd));
 205         pmdp_huge_get_and_clear(mm, vaddr, pmdp);
 206         pmd = READ_ONCE(*pmdp);
 207         WARN_ON(!pmd_none(pmd));
 208
 209         pmd = pfn_pmd(pfn, prot);
 210         pmd = pmd_wrprotect(pmd);
 211         pmd = pmd_mkclean(pmd);
 212         set_pmd_at(mm, vaddr, pmdp, pmd);
 213         pmd = pmd_mkwrite(pmd);
 214         pmd = pmd_mkdirty(pmd);
 215         pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1);
 216         pmd = READ_ONCE(*pmdp);
 217         WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd)));
 218         pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1);
 219         pmd = READ_ONCE(*pmdp);
 220         WARN_ON(!pmd_none(pmd));
 221
 222         pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
 223         pmd = pmd_mkyoung(pmd);
 224         set_pmd_at(mm, vaddr, pmdp, pmd);
 225         pmdp_test_and_clear_young(vma, vaddr, pmdp);
 226         pmd = READ_ONCE(*pmdp);
 227         WARN_ON(pmd_young(pmd));
 228
 229         /*  Clear the pte entries  */
 230         pmdp_huge_get_and_clear(mm, vaddr, pmdp);
 231         pgtable = pgtable_trans_huge_withdraw(mm, pmdp);
 232 }
 233
 234 static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot)
 235 {
 236         pmd_t pmd;
 237
 238         if (!has_transparent_hugepage())
 239                 return;
 240
 241         pr_debug("Validating PMD leaf\n");
 242         pmd = pfn_pmd(pfn, prot);
 243
 244         /*
 245          * PMD based THP is a leaf entry.
 246          */
 247         pmd = pmd_mkhuge(pmd);
 248         WARN_ON(!pmd_leaf(pmd));
 249 }
 250
 251 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
 252 static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
 253 {
 254         pmd_t pmd;
 255
 256         if (!arch_vmap_pmd_supported(prot))
 257                 return;
 258
 259         pr_debug("Validating PMD huge\n");
 260         /*
 261          * X86 defined pmd_set_huge() verifies that the given
 262          * PMD is not a populated non-leaf entry.
 263          */
 264         WRITE_ONCE(*pmdp, __pmd(0));
 265         WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot));
 266         WARN_ON(!pmd_clear_huge(pmdp));
 267         pmd = READ_ONCE(*pmdp);
 268         WARN_ON(!pmd_none(pmd));
 269 }
 270 #else /* CONFIG_HAVE_ARCH_HUGE_VMAP */
 271 static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) { }
 272 #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
 273
 274 static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot)
 275 {
 276         pmd_t pmd;
 277
 278         if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
 279                 return;
 280
 281         if (!has_transparent_hugepage())
 282                 return;
 283
 284         pr_debug("Validating PMD saved write\n");
 285         pmd = pfn_pmd(pfn, prot);
 286         WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd))));
 287         WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd))));
 288 }
 289
 290 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 291 static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx)
 292 {
 293         pgprot_t prot = protection_map[idx];
 294         unsigned long val = idx, *ptr = &val;
 295         pud_t pud;
 296
 297         if (!has_transparent_hugepage())
 298                 return;
 299
 300         pr_debug("Validating PUD basic (%pGv)\n", ptr);
 301         pud = pfn_pud(pfn, prot);
 302
 303         /*
 304          * This test needs to be executed after the given page table entry
 305          * is created with pfn_pud() to make sure that protection_map[idx]
 306          * does not have the dirty bit enabled from the beginning. This is
 307          * important for platforms like arm64 where (!PTE_RDONLY) indicate
 308          * dirty bit being set.
 309          */
 310         WARN_ON(pud_dirty(pud_wrprotect(pud)));
 311
 312         WARN_ON(!pud_same(pud, pud));
 313         WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud))));
 314         WARN_ON(!pud_dirty(pud_mkdirty(pud_mkclean(pud))));
 315         WARN_ON(pud_dirty(pud_mkclean(pud_mkdirty(pud))));
 316         WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud))));
 317         WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud))));
 318         WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud))));
 319         WARN_ON(pud_dirty(pud_wrprotect(pud_mkclean(pud))));
 320         WARN_ON(!pud_dirty(pud_wrprotect(pud_mkdirty(pud))));
 321
 322         if (mm_pmd_folded(mm))
 323                 return;
 324
 325         /*
 326          * A huge page does not point to next level page table
 327          * entry. Hence this must qualify as pud_bad().
 328          */
 329         WARN_ON(!pud_bad(pud_mkhuge(pud)));
 330 }
 331
 332 static void __init pud_advanced_tests(struct mm_struct *mm,
 333                                       struct vm_area_struct *vma, pud_t *pudp,
 334                                       unsigned long pfn, unsigned long vaddr,
 335                                       pgprot_t prot)
 336 {
 337         pud_t pud;
 338
 339         if (!has_transparent_hugepage())
 340                 return;
 341
 342         pr_debug("Validating PUD advanced\n");
 343         /* Align the address wrt HPAGE_PUD_SIZE */
 344         vaddr &= HPAGE_PUD_MASK;
 345
 346         pud = pfn_pud(pfn, prot);
 347         set_pud_at(mm, vaddr, pudp, pud);
 348         pudp_set_wrprotect(mm, vaddr, pudp);
 349         pud = READ_ONCE(*pudp);
 350         WARN_ON(pud_write(pud));
 351
 352 #ifndef __PAGETABLE_PMD_FOLDED
 353         pudp_huge_get_and_clear(mm, vaddr, pudp);
 354         pud = READ_ONCE(*pudp);
 355         WARN_ON(!pud_none(pud));
 356 #endif /* __PAGETABLE_PMD_FOLDED */
 357         pud = pfn_pud(pfn, prot);
 358         pud = pud_wrprotect(pud);
 359         pud = pud_mkclean(pud);
 360         set_pud_at(mm, vaddr, pudp, pud);
 361         pud = pud_mkwrite(pud);
 362         pud = pud_mkdirty(pud);
 363         pudp_set_access_flags(vma, vaddr, pudp, pud, 1);
 364         pud = READ_ONCE(*pudp);
 365         WARN_ON(!(pud_write(pud) && pud_dirty(pud)));
 366
 367 #ifndef __PAGETABLE_PMD_FOLDED
 368         pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1);
 369         pud = READ_ONCE(*pudp);
 370         WARN_ON(!pud_none(pud));
 371 #endif /* __PAGETABLE_PMD_FOLDED */
 372
 373         pud = pfn_pud(pfn, prot);
 374         pud = pud_mkyoung(pud);
 375         set_pud_at(mm, vaddr, pudp, pud);
 376         pudp_test_and_clear_young(vma, vaddr, pudp);
 377         pud = READ_ONCE(*pudp);
 378         WARN_ON(pud_young(pud));
 379
 380         pudp_huge_get_and_clear(mm, vaddr, pudp);
 381 }
 382
 383 static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot)
 384 {
 385         pud_t pud;
 386
 387         if (!has_transparent_hugepage())
 388                 return;
 389
 390         pr_debug("Validating PUD leaf\n");
 391         pud = pfn_pud(pfn, prot);
 392         /*
 393          * PUD based THP is a leaf entry.
 394          */
 395         pud = pud_mkhuge(pud);
 396         WARN_ON(!pud_leaf(pud));
 397 }
 398
 399 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
 400 static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
 401 {
 402         pud_t pud;
 403
 404         if (!arch_vmap_pud_supported(prot))
 405                 return;
 406
 407         pr_debug("Validating PUD huge\n");
 408         /*
 409          * X86 defined pud_set_huge() verifies that the given
 410          * PUD is not a populated non-leaf entry.
 411          */
 412         WRITE_ONCE(*pudp, __pud(0));
 413         WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot));
 414         WARN_ON(!pud_clear_huge(pudp));
 415         pud = READ_ONCE(*pudp);
 416         WARN_ON(!pud_none(pud));
 417 }
 418 #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
 419 static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { }
 420 #endif /* !CONFIG_HAVE_ARCH_HUGE_VMAP */
 421
 422 #else  /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 423 static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { }
 424 static void __init pud_advanced_tests(struct mm_struct *mm,
 425                                       struct vm_area_struct *vma, pud_t *pudp,
 426                                       unsigned long pfn, unsigned long vaddr,
 427                                       pgprot_t prot)
 428 {
 429 }
 430 static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { }
 431 static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
 432 {
 433 }
 434 #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 435 #else  /* !CONFIG_TRANSPARENT_HUGEPAGE */
 436 static void __init pmd_basic_tests(unsigned long pfn, int idx) { }
 437 static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { }
 438 static void __init pmd_advanced_tests(struct mm_struct *mm,
 439                                       struct vm_area_struct *vma, pmd_t *pmdp,
 440                                       unsigned long pfn, unsigned long vaddr,
 441                                       pgprot_t prot, pgtable_t pgtable)
 442 {
 443 }
 444 static void __init pud_advanced_tests(struct mm_struct *mm,
 445                                       struct vm_area_struct *vma, pud_t *pudp,
 446                                       unsigned long pfn, unsigned long vaddr,
 447                                       pgprot_t prot)
 448 {
 449 }
 450 static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { }
 451 static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { }
 452 static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot)
 453 {
 454 }
 455 static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot)
 456 {
 457 }
 458 static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { }
 459 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 460
 461 static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot)
 462 {
 463         p4d_t p4d;
 464
 465         pr_debug("Validating P4D basic\n");
 466         memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t));
 467         WARN_ON(!p4d_same(p4d, p4d));
 468 }
 469
 470 static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot)
 471 {
 472         pgd_t pgd;
 473
 474         pr_debug("Validating PGD basic\n");
 475         memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t));
 476         WARN_ON(!pgd_same(pgd, pgd));
 477 }
 478
 479 #ifndef __PAGETABLE_PUD_FOLDED
 480 static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp)
 481 {
 482         pud_t pud = READ_ONCE(*pudp);
 483
 484         if (mm_pmd_folded(mm))
 485                 return;
 486
 487         pr_debug("Validating PUD clear\n");
 488         pud = __pud(pud_val(pud) | RANDOM_ORVALUE);
 489         WRITE_ONCE(*pudp, pud);
 490         pud_clear(pudp);
 491         pud = READ_ONCE(*pudp);
 492         WARN_ON(!pud_none(pud));
 493 }
 494
 495 static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp,
 496                                       pmd_t *pmdp)
 497 {
 498         pud_t pud;
 499
 500         if (mm_pmd_folded(mm))
 501                 return;
 502
 503         pr_debug("Validating PUD populate\n");
 504         /*
 505          * This entry points to next level page table page.
 506          * Hence this must not qualify as pud_bad().
 507          */
 508         pud_populate(mm, pudp, pmdp);
 509         pud = READ_ONCE(*pudp);
 510         WARN_ON(pud_bad(pud));
 511 }
 512 #else  /* !__PAGETABLE_PUD_FOLDED */
 513 static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) { }
 514 static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp,
 515                                       pmd_t *pmdp)
 516 {
 517 }
 518 #endif /* PAGETABLE_PUD_FOLDED */
 519
 520 #ifndef __PAGETABLE_P4D_FOLDED
 521 static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp)
 522 {
 523         p4d_t p4d = READ_ONCE(*p4dp);
 524
 525         if (mm_pud_folded(mm))
 526                 return;
 527
 528         pr_debug("Validating P4D clear\n");
 529         p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE);
 530         WRITE_ONCE(*p4dp, p4d);
 531         p4d_clear(p4dp);
 532         p4d = READ_ONCE(*p4dp);
 533         WARN_ON(!p4d_none(p4d));
 534 }
 535
 536 static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
 537                                       pud_t *pudp)
 538 {
 539         p4d_t p4d;
 540
 541         if (mm_pud_folded(mm))
 542                 return;
 543
 544         pr_debug("Validating P4D populate\n");
 545         /*
 546          * This entry points to next level page table page.
 547          * Hence this must not qualify as p4d_bad().
 548          */
 549         pud_clear(pudp);
 550         p4d_clear(p4dp);
 551         p4d_populate(mm, p4dp, pudp);
 552         p4d = READ_ONCE(*p4dp);
 553         WARN_ON(p4d_bad(p4d));
 554 }
 555
 556 static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp)
 557 {
 558         pgd_t pgd = READ_ONCE(*pgdp);
 559
 560         if (mm_p4d_folded(mm))
 561                 return;
 562
 563         pr_debug("Validating PGD clear\n");
 564         pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE);
 565         WRITE_ONCE(*pgdp, pgd);
 566         pgd_clear(pgdp);
 567         pgd = READ_ONCE(*pgdp);
 568         WARN_ON(!pgd_none(pgd));
 569 }
 570
 571 static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
 572                                       p4d_t *p4dp)
 573 {
 574         pgd_t pgd;
 575
 576         if (mm_p4d_folded(mm))
 577                 return;
 578
 579         pr_debug("Validating PGD populate\n");
 580         /*
 581          * This entry points to next level page table page.
 582          * Hence this must not qualify as pgd_bad().
 583          */
 584         p4d_clear(p4dp);
 585         pgd_clear(pgdp);
 586         pgd_populate(mm, pgdp, p4dp);
 587         pgd = READ_ONCE(*pgdp);
 588         WARN_ON(pgd_bad(pgd));
 589 }
 590 #else  /* !__PAGETABLE_P4D_FOLDED */
 591 static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { }
 592 static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { }
 593 static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp,
 594                                       pud_t *pudp)
 595 {
 596 }
 597 static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp,
 598                                       p4d_t *p4dp)
 599 {
 600 }
 601 #endif /* PAGETABLE_P4D_FOLDED */
 602
 603 static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep,
 604                                    unsigned long pfn, unsigned long vaddr,
 605                                    pgprot_t prot)
 606 {
 607         pte_t pte = pfn_pte(pfn, prot);
 608
 609         pr_debug("Validating PTE clear\n");
 610 #ifndef CONFIG_RISCV
 611         pte = __pte(pte_val(pte) | RANDOM_ORVALUE);
 612 #endif
 613         set_pte_at(mm, vaddr, ptep, pte);
 614         barrier();
 615         pte_clear(mm, vaddr, ptep);
 616         pte = ptep_get(ptep);
 617         WARN_ON(!pte_none(pte));
 618 }
 619
 620 static void __init pmd_clear_tests(struct mm_struct *mm, pmd_t *pmdp)
 621 {
 622         pmd_t pmd = READ_ONCE(*pmdp);
 623
 624         pr_debug("Validating PMD clear\n");
 625         pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE);
 626         WRITE_ONCE(*pmdp, pmd);
 627         pmd_clear(pmdp);
 628         pmd = READ_ONCE(*pmdp);
 629         WARN_ON(!pmd_none(pmd));
 630 }
 631
 632 static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp,
 633                                       pgtable_t pgtable)
 634 {
 635         pmd_t pmd;
 636
 637         pr_debug("Validating PMD populate\n");
 638         /*
 639          * This entry points to next level page table page.
 640          * Hence this must not qualify as pmd_bad().
 641          */
 642         pmd_populate(mm, pmdp, pgtable);
 643         pmd = READ_ONCE(*pmdp);
 644         WARN_ON(pmd_bad(pmd));
 645 }
 646
 647 static void __init pte_special_tests(unsigned long pfn, pgprot_t prot)
 648 {
 649         pte_t pte = pfn_pte(pfn, prot);
 650
 651         if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL))
 652                 return;
 653
 654         pr_debug("Validating PTE special\n");
 655         WARN_ON(!pte_special(pte_mkspecial(pte)));
 656 }
 657
 658 static void __init pte_protnone_tests(unsigned long pfn, pgprot_t prot)
 659 {
 660         pte_t pte = pfn_pte(pfn, prot);
 661
 662         if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
 663                 return;
 664
 665         pr_debug("Validating PTE protnone\n");
 666         WARN_ON(!pte_protnone(pte));
 667         WARN_ON(!pte_present(pte));
 668 }
 669
 670 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 671 static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot)
 672 {
 673         pmd_t pmd;
 674
 675         if (!IS_ENABLED(CONFIG_NUMA_BALANCING))
 676                 return;
 677
 678         if (!has_transparent_hugepage())
 679                 return;
 680
 681         pr_debug("Validating PMD protnone\n");
 682         pmd = pmd_mkhuge(pfn_pmd(pfn, prot));
 683         WARN_ON(!pmd_protnone(pmd));
 684         WARN_ON(!pmd_present(pmd));
 685 }
 686 #else  /* !CONFIG_TRANSPARENT_HUGEPAGE */
 687 static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) { }
 688 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 689
 690 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
 691 static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot)
 692 {
 693         pte_t pte = pfn_pte(pfn, prot);
 694
 695         pr_debug("Validating PTE devmap\n");
 696         WARN_ON(!pte_devmap(pte_mkdevmap(pte)));
 697 }
 698
 699 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 700 static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot)
 701 {
 702         pmd_t pmd;
 703
 704         if (!has_transparent_hugepage())
 705                 return;
 706
 707         pr_debug("Validating PMD devmap\n");
 708         pmd = pfn_pmd(pfn, prot);
 709         WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd)));
 710 }
 711
 712 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 713 static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot)
 714 {
 715         pud_t pud;
 716
 717         if (!has_transparent_hugepage())
 718                 return;
 719
 720         pr_debug("Validating PUD devmap\n");
 721         pud = pfn_pud(pfn, prot);
 722         WARN_ON(!pud_devmap(pud_mkdevmap(pud)));
 723 }
 724 #else  /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 725 static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
 726 #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 727 #else  /* CONFIG_TRANSPARENT_HUGEPAGE */
 728 static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { }
 729 static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
 730 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 731 #else
 732 static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) { }
 733 static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { }
 734 static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { }
 735 #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */
 736
 737 static void __init pte_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
 738 {
 739         pte_t pte = pfn_pte(pfn, prot);
 740
 741         if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
 742                 return;
 743
 744         pr_debug("Validating PTE soft dirty\n");
 745         WARN_ON(!pte_soft_dirty(pte_mksoft_dirty(pte)));
 746         WARN_ON(pte_soft_dirty(pte_clear_soft_dirty(pte)));
 747 }
 748
 749 static void __init pte_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
 750 {
 751         pte_t pte = pfn_pte(pfn, prot);
 752
 753         if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
 754                 return;
 755
 756         pr_debug("Validating PTE swap soft dirty\n");
 757         WARN_ON(!pte_swp_soft_dirty(pte_swp_mksoft_dirty(pte)));
 758         WARN_ON(pte_swp_soft_dirty(pte_swp_clear_soft_dirty(pte)));
 759 }
 760
 761 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 762 static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
 763 {
 764         pmd_t pmd;
 765
 766         if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY))
 767                 return;
 768
 769         if (!has_transparent_hugepage())
 770                 return;
 771
 772         pr_debug("Validating PMD soft dirty\n");
 773         pmd = pfn_pmd(pfn, prot);
 774         WARN_ON(!pmd_soft_dirty(pmd_mksoft_dirty(pmd)));
 775         WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd)));
 776 }
 777
 778 static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
 779 {
 780         pmd_t pmd;
 781
 782         if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) ||
 783                 !IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION))
 784                 return;
 785
 786         if (!has_transparent_hugepage())
 787                 return;
 788
 789         pr_debug("Validating PMD swap soft dirty\n");
 790         pmd = pfn_pmd(pfn, prot);
 791         WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd)));
 792         WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd)));
 793 }
 794 #else  /* !CONFIG_ARCH_HAS_PTE_DEVMAP */
 795 static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) { }
 796 static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot)
 797 {
 798 }
 799 #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */
 800
 801 static void __init pte_swap_tests(unsigned long pfn, pgprot_t prot)
 802 {
 803         swp_entry_t swp;
 804         pte_t pte;
 805
 806         pr_debug("Validating PTE swap\n");
 807         pte = pfn_pte(pfn, prot);
 808         swp = __pte_to_swp_entry(pte);
 809         pte = __swp_entry_to_pte(swp);
 810         WARN_ON(pfn != pte_pfn(pte));
 811 }
 812
 813 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
 814 static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot)
 815 {
 816         swp_entry_t swp;
 817         pmd_t pmd;
 818
 819         if (!has_transparent_hugepage())
 820                 return;
 821
 822         pr_debug("Validating PMD swap\n");
 823         pmd = pfn_pmd(pfn, prot);
 824         swp = __pmd_to_swp_entry(pmd);
 825         pmd = __swp_entry_to_pmd(swp);
 826         WARN_ON(pfn != pmd_pfn(pmd));
 827 }
 828 #else  /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */
 829 static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { }
 830 #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
 831
 832 static void __init swap_migration_tests(void)
 833 {
 834         struct page *page;
 835         swp_entry_t swp;
 836
 837         if (!IS_ENABLED(CONFIG_MIGRATION))
 838                 return;
 839
 840         pr_debug("Validating swap migration\n");
 841         /*
 842          * swap_migration_tests() requires a dedicated page as it needs to
 843          * be locked before creating a migration entry from it. Locking the
 844          * page that actually maps kernel text ('start_kernel') can be real
 845          * problematic. Lets allocate a dedicated page explicitly for this
 846          * purpose that will be freed subsequently.
 847          */
 848         page = alloc_page(GFP_KERNEL);
 849         if (!page) {
 850                 pr_err("page allocation failed\n");
 851                 return;
 852         }
 853
 854         /*
 855          * make_migration_entry() expects given page to be
 856          * locked, otherwise it stumbles upon a BUG_ON().
 857          */
 858         __SetPageLocked(page);
 859         swp = make_migration_entry(page, 1);
 860         WARN_ON(!is_migration_entry(swp));
 861         WARN_ON(!is_write_migration_entry(swp));
 862
 863         make_migration_entry_read(&swp);
 864         WARN_ON(!is_migration_entry(swp));
 865         WARN_ON(is_write_migration_entry(swp));
 866
 867         swp = make_migration_entry(page, 0);
 868         WARN_ON(!is_migration_entry(swp));
 869         WARN_ON(is_write_migration_entry(swp));
 870         __ClearPageLocked(page);
 871         __free_page(page);
 872 }
 873
 874 #ifdef CONFIG_HUGETLB_PAGE
 875 static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot)
 876 {
 877         struct page *page;
 878         pte_t pte;
 879
 880         pr_debug("Validating HugeTLB basic\n");
 881         /*
 882          * Accessing the page associated with the pfn is safe here,
 883          * as it was previously derived from a real kernel symbol.
 884          */
 885         page = pfn_to_page(pfn);
 886         pte = mk_huge_pte(page, prot);
 887
 888         WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte)));
 889         WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte))));
 890         WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte))));
 891
 892 #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB
 893         pte = pfn_pte(pfn, prot);
 894
 895         WARN_ON(!pte_huge(pte_mkhuge(pte)));
 896 #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
 897 }
 898 #else  /* !CONFIG_HUGETLB_PAGE */
 899 static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { }
 900 #endif /* CONFIG_HUGETLB_PAGE */
 901
 902 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 903 static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot)
 904 {
 905         pmd_t pmd;
 906
 907         if (!has_transparent_hugepage())
 908                 return;
 909
 910         pr_debug("Validating PMD based THP\n");
 911         /*
 912          * pmd_trans_huge() and pmd_present() must return positive after
 913          * MMU invalidation with pmd_mkinvalid(). This behavior is an
 914          * optimization for transparent huge page. pmd_trans_huge() must
 915          * be true if pmd_page() returns a valid THP to avoid taking the
 916          * pmd_lock when others walk over non transhuge pmds (i.e. there
 917          * are no THP allocated). Especially when splitting a THP and
 918          * removing the present bit from the pmd, pmd_trans_huge() still
 919          * needs to return true. pmd_present() should be true whenever
 920          * pmd_trans_huge() returns true.
 921          */
 922         pmd = pfn_pmd(pfn, prot);
 923         WARN_ON(!pmd_trans_huge(pmd_mkhuge(pmd)));
 924
 925 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
 926         WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd))));
 927         WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd))));
 928 #endif /* __HAVE_ARCH_PMDP_INVALIDATE */
 929 }
 930
 931 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 932 static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot)
 933 {
 934         pud_t pud;
 935
 936         if (!has_transparent_hugepage())
 937                 return;
 938
 939         pr_debug("Validating PUD based THP\n");
 940         pud = pfn_pud(pfn, prot);
 941         WARN_ON(!pud_trans_huge(pud_mkhuge(pud)));
 942
 943         /*
 944          * pud_mkinvalid() has been dropped for now. Enable back
 945          * these tests when it comes back with a modified pud_present().
 946          *
 947          * WARN_ON(!pud_trans_huge(pud_mkinvalid(pud_mkhuge(pud))));
 948          * WARN_ON(!pud_present(pud_mkinvalid(pud_mkhuge(pud))));
 949          */
 950 }
 951 #else  /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 952 static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { }
 953 #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
 954 #else  /* !CONFIG_TRANSPARENT_HUGEPAGE */
 955 static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) { }
 956 static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { }
 957 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 958
 959 static unsigned long __init get_random_vaddr(void)
 960 {
 961         unsigned long random_vaddr, random_pages, total_user_pages;
 962
 963         total_user_pages = (TASK_SIZE - FIRST_USER_ADDRESS) / PAGE_SIZE;
 964
 965         random_pages = get_random_long() % total_user_pages;
 966         random_vaddr = FIRST_USER_ADDRESS + random_pages * PAGE_SIZE;
 967
 968         return random_vaddr;
 969 }
 970
 971 static int __init debug_vm_pgtable(void)
 972 {
 973         struct vm_area_struct *vma;
 974         struct mm_struct *mm;
 975         pgd_t *pgdp;
 976         p4d_t *p4dp, *saved_p4dp;
 977         pud_t *pudp, *saved_pudp;
 978         pmd_t *pmdp, *saved_pmdp, pmd;
 979         pte_t *ptep;
 980         pgtable_t saved_ptep;
 981         pgprot_t prot, protnone;
 982         phys_addr_t paddr;
 983         unsigned long vaddr, pte_aligned, pmd_aligned;
 984         unsigned long pud_aligned, p4d_aligned, pgd_aligned;
 985         spinlock_t *ptl = NULL;
 986         int idx;
 987
 988         pr_info("Validating architecture page table helpers\n");
 989         prot = vm_get_page_prot(VMFLAGS);
 990         vaddr = get_random_vaddr();
 991         mm = mm_alloc();
 992         if (!mm) {
 993                 pr_err("mm_struct allocation failed\n");
 994                 return 1;
 995         }
 996
 997         /*
 998          * __P000 (or even __S000) will help create page table entries with
 999          * PROT_NONE permission as required for pxx_protnone_tests().
1000          */
1001         protnone = __P000;
1002
1003         vma = vm_area_alloc(mm);
1004         if (!vma) {
1005                 pr_err("vma allocation failed\n");
1006                 return 1;
1007         }
1008
1009         /*
1010          * PFN for mapping at PTE level is determined from a standard kernel
1011          * text symbol. But pfns for higher page table levels are derived by
1012          * masking lower bits of this real pfn. These derived pfns might not
1013          * exist on the platform but that does not really matter as pfn_pxx()
1014          * helpers will still create appropriate entries for the test. This
1015          * helps avoid large memory block allocations to be used for mapping
1016          * at higher page table levels.
1017          */
1018         paddr = __pa_symbol(&start_kernel);
1019
1020         pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT;
1021         pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT;
1022         pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT;
1023         p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT;
1024         pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT;
1025         WARN_ON(!pfn_valid(pte_aligned));
1026
1027         pgdp = pgd_offset(mm, vaddr);
1028         p4dp = p4d_alloc(mm, pgdp, vaddr);
1029         pudp = pud_alloc(mm, p4dp, vaddr);
1030         pmdp = pmd_alloc(mm, pudp, vaddr);
1031         /*
1032          * Allocate pgtable_t
1033          */
1034         if (pte_alloc(mm, pmdp)) {
1035                 pr_err("pgtable allocation failed\n");
1036                 return 1;
1037         }
1038
1039         /*
1040          * Save all the page table page addresses as the page table
1041          * entries will be used for testing with random or garbage
1042          * values. These saved addresses will be used for freeing
1043          * page table pages.
1044          */
1045         pmd = READ_ONCE(*pmdp);
1046         saved_p4dp = p4d_offset(pgdp, 0UL);
1047         saved_pudp = pud_offset(p4dp, 0UL);
1048         saved_pmdp = pmd_offset(pudp, 0UL);
1049         saved_ptep = pmd_pgtable(pmd);
1050
1051         /*
1052          * Iterate over the protection_map[] to make sure that all
1053          * the basic page table transformation validations just hold
1054          * true irrespective of the starting protection value for a
1055          * given page table entry.
1056          */
1057         for (idx = 0; idx < ARRAY_SIZE(protection_map); idx++) {
1058                 pte_basic_tests(pte_aligned, idx);
1059                 pmd_basic_tests(pmd_aligned, idx);
1060                 pud_basic_tests(mm, pud_aligned, idx);
1061         }
1062
1063         /*
1064          * Both P4D and PGD level tests are very basic which do not
1065          * involve creating page table entries from the protection
1066          * value and the given pfn. Hence just keep them out from
1067          * the above iteration for now to save some test execution
1068          * time.
1069          */
1070         p4d_basic_tests(p4d_aligned, prot);
1071         pgd_basic_tests(pgd_aligned, prot);
1072
1073         pmd_leaf_tests(pmd_aligned, prot);
1074         pud_leaf_tests(pud_aligned, prot);
1075
1076         pte_savedwrite_tests(pte_aligned, protnone);
1077         pmd_savedwrite_tests(pmd_aligned, protnone);
1078
1079         pte_special_tests(pte_aligned, prot);
1080         pte_protnone_tests(pte_aligned, protnone);
1081         pmd_protnone_tests(pmd_aligned, protnone);
1082
1083         pte_devmap_tests(pte_aligned, prot);
1084         pmd_devmap_tests(pmd_aligned, prot);
1085         pud_devmap_tests(pud_aligned, prot);
1086
1087         pte_soft_dirty_tests(pte_aligned, prot);
1088         pmd_soft_dirty_tests(pmd_aligned, prot);
1089         pte_swap_soft_dirty_tests(pte_aligned, prot);
1090         pmd_swap_soft_dirty_tests(pmd_aligned, prot);
1091
1092         pte_swap_tests(pte_aligned, prot);
1093         pmd_swap_tests(pmd_aligned, prot);
1094
1095         swap_migration_tests();
1096
1097         pmd_thp_tests(pmd_aligned, prot);
1098         pud_thp_tests(pud_aligned, prot);
1099
1100         hugetlb_basic_tests(pte_aligned, prot);
1101
1102         /*
1103          * Page table modifying tests. They need to hold
1104          * proper page table lock.
1105          */
1106
1107         ptep = pte_offset_map_lock(mm, pmdp, vaddr, &ptl);
1108         pte_clear_tests(mm, ptep, pte_aligned, vaddr, prot);
1109         pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
1110         pte_unmap_unlock(ptep, ptl);
1111
1112         ptl = pmd_lock(mm, pmdp);
1113         pmd_clear_tests(mm, pmdp);
1114         pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot, saved_ptep);
1115         pmd_huge_tests(pmdp, pmd_aligned, prot);
1116         pmd_populate_tests(mm, pmdp, saved_ptep);
1117         spin_unlock(ptl);
1118
1119         ptl = pud_lock(mm, pudp);
1120         pud_clear_tests(mm, pudp);
1121         pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot);
1122         pud_huge_tests(pudp, pud_aligned, prot);
1123         pud_populate_tests(mm, pudp, saved_pmdp);
1124         spin_unlock(ptl);
1125
1126         spin_lock(&mm->page_table_lock);
1127         p4d_clear_tests(mm, p4dp);
1128         pgd_clear_tests(mm, pgdp);
1129         p4d_populate_tests(mm, p4dp, saved_pudp);
1130         pgd_populate_tests(mm, pgdp, saved_p4dp);
1131         spin_unlock(&mm->page_table_lock);
1132
1133         p4d_free(mm, saved_p4dp);
1134         pud_free(mm, saved_pudp);
1135         pmd_free(mm, saved_pmdp);
1136         pte_free(mm, saved_ptep);
1137
1138         vm_area_free(vma);
1139         mm_dec_nr_puds(mm);
1140         mm_dec_nr_pmds(mm);
1141         mm_dec_nr_ptes(mm);
1142         mmdrop(mm);
1143         return 0;
1144 }
1145 late_initcall(debug_vm_pgtable);