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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> | |
c4876ff6 | 18 | #include <linux/memblock.h> |
399145f9 AK |
19 | #include <linux/mm.h> |
20 | #include <linux/mman.h> | |
21 | #include <linux/mm_types.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/pfn_t.h> | |
24 | #include <linux/printk.h> | |
a5c3b9ff | 25 | #include <linux/pgtable.h> |
399145f9 AK |
26 | #include <linux/random.h> |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/swap.h> | |
29 | #include <linux/swapops.h> | |
30 | #include <linux/start_kernel.h> | |
31 | #include <linux/sched/mm.h> | |
85a14463 | 32 | #include <linux/io.h> |
8c5b3a8a GS |
33 | |
34 | #include <asm/cacheflush.h> | |
399145f9 | 35 | #include <asm/pgalloc.h> |
a5c3b9ff | 36 | #include <asm/tlbflush.h> |
399145f9 | 37 | |
b1d00007 | 38 | /* |
ee65728e | 39 | * Please refer Documentation/mm/arch_pgtable_helpers.rst for the semantics |
b1d00007 AK |
40 | * expectations that are being validated here. All future changes in here |
41 | * or the documentation need to be in sync. | |
d7e679b6 | 42 | * |
399145f9 AK |
43 | * On s390 platform, the lower 4 bits are used to identify given page table |
44 | * entry type. But these bits might affect the ability to clear entries with | |
45 | * pxx_clear() because of how dynamic page table folding works on s390. So | |
46 | * while loading up the entries do not change the lower 4 bits. It does not | |
cfc5bbc4 AK |
47 | * have affect any other platform. Also avoid the 62nd bit on ppc64 that is |
48 | * used to mark a pte entry. | |
399145f9 | 49 | */ |
cfc5bbc4 AK |
50 | #define S390_SKIP_MASK GENMASK(3, 0) |
51 | #if __BITS_PER_LONG == 64 | |
52 | #define PPC64_SKIP_MASK GENMASK(62, 62) | |
53 | #else | |
54 | #define PPC64_SKIP_MASK 0x0 | |
55 | #endif | |
56 | #define ARCH_SKIP_MASK (S390_SKIP_MASK | PPC64_SKIP_MASK) | |
57 | #define RANDOM_ORVALUE (GENMASK(BITS_PER_LONG - 1, 0) & ~ARCH_SKIP_MASK) | |
399145f9 AK |
58 | #define RANDOM_NZVALUE GENMASK(7, 0) |
59 | ||
3c9b84f0 GS |
60 | struct pgtable_debug_args { |
61 | struct mm_struct *mm; | |
62 | struct vm_area_struct *vma; | |
63 | ||
64 | pgd_t *pgdp; | |
65 | p4d_t *p4dp; | |
66 | pud_t *pudp; | |
67 | pmd_t *pmdp; | |
68 | pte_t *ptep; | |
69 | ||
70 | p4d_t *start_p4dp; | |
71 | pud_t *start_pudp; | |
72 | pmd_t *start_pmdp; | |
73 | pgtable_t start_ptep; | |
74 | ||
75 | unsigned long vaddr; | |
76 | pgprot_t page_prot; | |
77 | pgprot_t page_prot_none; | |
78 | ||
79 | bool is_contiguous_page; | |
80 | unsigned long pud_pfn; | |
81 | unsigned long pmd_pfn; | |
82 | unsigned long pte_pfn; | |
83 | ||
c4876ff6 | 84 | unsigned long fixed_alignment; |
3c9b84f0 GS |
85 | unsigned long fixed_pgd_pfn; |
86 | unsigned long fixed_p4d_pfn; | |
87 | unsigned long fixed_pud_pfn; | |
88 | unsigned long fixed_pmd_pfn; | |
89 | unsigned long fixed_pte_pfn; | |
90 | }; | |
91 | ||
36b77d1e | 92 | static void __init pte_basic_tests(struct pgtable_debug_args *args, int idx) |
399145f9 | 93 | { |
31d17076 | 94 | pgprot_t prot = vm_get_page_prot(idx); |
36b77d1e | 95 | pte_t pte = pfn_pte(args->fixed_pte_pfn, prot); |
2e326c07 | 96 | unsigned long val = idx, *ptr = &val; |
399145f9 | 97 | |
2e326c07 | 98 | pr_debug("Validating PTE basic (%pGv)\n", ptr); |
bb5c47ce AK |
99 | |
100 | /* | |
101 | * This test needs to be executed after the given page table entry | |
31d17076 | 102 | * is created with pfn_pte() to make sure that vm_get_page_prot(idx) |
bb5c47ce AK |
103 | * does not have the dirty bit enabled from the beginning. This is |
104 | * important for platforms like arm64 where (!PTE_RDONLY) indicate | |
105 | * dirty bit being set. | |
106 | */ | |
107 | WARN_ON(pte_dirty(pte_wrprotect(pte))); | |
108 | ||
399145f9 AK |
109 | WARN_ON(!pte_same(pte, pte)); |
110 | WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte)))); | |
111 | WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte)))); | |
112 | WARN_ON(!pte_write(pte_mkwrite(pte_wrprotect(pte)))); | |
113 | WARN_ON(pte_young(pte_mkold(pte_mkyoung(pte)))); | |
114 | WARN_ON(pte_dirty(pte_mkclean(pte_mkdirty(pte)))); | |
115 | WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte)))); | |
bb5c47ce AK |
116 | WARN_ON(pte_dirty(pte_wrprotect(pte_mkclean(pte)))); |
117 | WARN_ON(!pte_dirty(pte_wrprotect(pte_mkdirty(pte)))); | |
399145f9 AK |
118 | } |
119 | ||
44966c44 | 120 | static void __init pte_advanced_tests(struct pgtable_debug_args *args) |
a5c3b9ff | 121 | { |
8c5b3a8a | 122 | struct page *page; |
b593b90d | 123 | pte_t pte; |
a5c3b9ff | 124 | |
c3824e18 AK |
125 | /* |
126 | * Architectures optimize set_pte_at by avoiding TLB flush. | |
127 | * This requires set_pte_at to be not used to update an | |
128 | * existing pte entry. Clear pte before we do set_pte_at | |
8c5b3a8a GS |
129 | * |
130 | * flush_dcache_page() is called after set_pte_at() to clear | |
131 | * PG_arch_1 for the page on ARM64. The page flag isn't cleared | |
132 | * when it's released and page allocation check will fail when | |
133 | * the page is allocated again. For architectures other than ARM64, | |
134 | * the unexpected overhead of cache flushing is acceptable. | |
c3824e18 | 135 | */ |
8c5b3a8a GS |
136 | page = (args->pte_pfn != ULONG_MAX) ? pfn_to_page(args->pte_pfn) : NULL; |
137 | if (!page) | |
44966c44 | 138 | return; |
c3824e18 | 139 | |
6315df41 | 140 | pr_debug("Validating PTE advanced\n"); |
9f2bad09 HD |
141 | if (WARN_ON(!args->ptep)) |
142 | return; | |
143 | ||
44966c44 GS |
144 | pte = pfn_pte(args->pte_pfn, args->page_prot); |
145 | set_pte_at(args->mm, args->vaddr, args->ptep, pte); | |
8c5b3a8a | 146 | flush_dcache_page(page); |
44966c44 GS |
147 | ptep_set_wrprotect(args->mm, args->vaddr, args->ptep); |
148 | pte = ptep_get(args->ptep); | |
a5c3b9ff | 149 | WARN_ON(pte_write(pte)); |
44966c44 GS |
150 | ptep_get_and_clear(args->mm, args->vaddr, args->ptep); |
151 | pte = ptep_get(args->ptep); | |
a5c3b9ff AK |
152 | WARN_ON(!pte_none(pte)); |
153 | ||
44966c44 | 154 | pte = pfn_pte(args->pte_pfn, args->page_prot); |
a5c3b9ff AK |
155 | pte = pte_wrprotect(pte); |
156 | pte = pte_mkclean(pte); | |
44966c44 | 157 | set_pte_at(args->mm, args->vaddr, args->ptep, pte); |
8c5b3a8a | 158 | flush_dcache_page(page); |
a5c3b9ff AK |
159 | pte = pte_mkwrite(pte); |
160 | pte = pte_mkdirty(pte); | |
44966c44 GS |
161 | ptep_set_access_flags(args->vma, args->vaddr, args->ptep, pte, 1); |
162 | pte = ptep_get(args->ptep); | |
a5c3b9ff | 163 | WARN_ON(!(pte_write(pte) && pte_dirty(pte))); |
44966c44 GS |
164 | ptep_get_and_clear_full(args->mm, args->vaddr, args->ptep, 1); |
165 | pte = ptep_get(args->ptep); | |
a5c3b9ff AK |
166 | WARN_ON(!pte_none(pte)); |
167 | ||
44966c44 | 168 | pte = pfn_pte(args->pte_pfn, args->page_prot); |
a5c3b9ff | 169 | pte = pte_mkyoung(pte); |
44966c44 | 170 | set_pte_at(args->mm, args->vaddr, args->ptep, pte); |
8c5b3a8a | 171 | flush_dcache_page(page); |
44966c44 GS |
172 | ptep_test_and_clear_young(args->vma, args->vaddr, args->ptep); |
173 | pte = ptep_get(args->ptep); | |
a5c3b9ff | 174 | WARN_ON(pte_young(pte)); |
fb5222aa PT |
175 | |
176 | ptep_get_and_clear_full(args->mm, args->vaddr, args->ptep, 1); | |
a5c3b9ff AK |
177 | } |
178 | ||
399145f9 | 179 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
36b77d1e | 180 | static void __init pmd_basic_tests(struct pgtable_debug_args *args, int idx) |
399145f9 | 181 | { |
31d17076 | 182 | pgprot_t prot = vm_get_page_prot(idx); |
2e326c07 | 183 | unsigned long val = idx, *ptr = &val; |
65ac1a60 | 184 | pmd_t pmd; |
399145f9 | 185 | |
787d563b AK |
186 | if (!has_transparent_hugepage()) |
187 | return; | |
188 | ||
2e326c07 | 189 | pr_debug("Validating PMD basic (%pGv)\n", ptr); |
36b77d1e | 190 | pmd = pfn_pmd(args->fixed_pmd_pfn, prot); |
bb5c47ce AK |
191 | |
192 | /* | |
193 | * This test needs to be executed after the given page table entry | |
31d17076 | 194 | * is created with pfn_pmd() to make sure that vm_get_page_prot(idx) |
bb5c47ce AK |
195 | * does not have the dirty bit enabled from the beginning. This is |
196 | * important for platforms like arm64 where (!PTE_RDONLY) indicate | |
197 | * dirty bit being set. | |
198 | */ | |
199 | WARN_ON(pmd_dirty(pmd_wrprotect(pmd))); | |
200 | ||
201 | ||
399145f9 AK |
202 | WARN_ON(!pmd_same(pmd, pmd)); |
203 | WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd)))); | |
204 | WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd)))); | |
205 | WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd)))); | |
206 | WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd)))); | |
207 | WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd)))); | |
208 | WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd)))); | |
bb5c47ce AK |
209 | WARN_ON(pmd_dirty(pmd_wrprotect(pmd_mkclean(pmd)))); |
210 | WARN_ON(!pmd_dirty(pmd_wrprotect(pmd_mkdirty(pmd)))); | |
399145f9 AK |
211 | /* |
212 | * A huge page does not point to next level page table | |
213 | * entry. Hence this must qualify as pmd_bad(). | |
214 | */ | |
215 | WARN_ON(!pmd_bad(pmd_mkhuge(pmd))); | |
216 | } | |
217 | ||
c0fe07b0 | 218 | static void __init pmd_advanced_tests(struct pgtable_debug_args *args) |
a5c3b9ff | 219 | { |
8c5b3a8a | 220 | struct page *page; |
65ac1a60 | 221 | pmd_t pmd; |
c0fe07b0 | 222 | unsigned long vaddr = args->vaddr; |
a5c3b9ff AK |
223 | |
224 | if (!has_transparent_hugepage()) | |
225 | return; | |
226 | ||
8c5b3a8a GS |
227 | page = (args->pmd_pfn != ULONG_MAX) ? pfn_to_page(args->pmd_pfn) : NULL; |
228 | if (!page) | |
c0fe07b0 GS |
229 | return; |
230 | ||
8c5b3a8a GS |
231 | /* |
232 | * flush_dcache_page() is called after set_pmd_at() to clear | |
233 | * PG_arch_1 for the page on ARM64. The page flag isn't cleared | |
234 | * when it's released and page allocation check will fail when | |
235 | * the page is allocated again. For architectures other than ARM64, | |
236 | * the unexpected overhead of cache flushing is acceptable. | |
237 | */ | |
6315df41 | 238 | pr_debug("Validating PMD advanced\n"); |
a5c3b9ff | 239 | /* Align the address wrt HPAGE_PMD_SIZE */ |
04f7ce3f | 240 | vaddr &= HPAGE_PMD_MASK; |
a5c3b9ff | 241 | |
c0fe07b0 | 242 | pgtable_trans_huge_deposit(args->mm, args->pmdp, args->start_ptep); |
87f34986 | 243 | |
c0fe07b0 GS |
244 | pmd = pfn_pmd(args->pmd_pfn, args->page_prot); |
245 | set_pmd_at(args->mm, vaddr, args->pmdp, pmd); | |
8c5b3a8a | 246 | flush_dcache_page(page); |
c0fe07b0 GS |
247 | pmdp_set_wrprotect(args->mm, vaddr, args->pmdp); |
248 | pmd = READ_ONCE(*args->pmdp); | |
a5c3b9ff | 249 | WARN_ON(pmd_write(pmd)); |
c0fe07b0 GS |
250 | pmdp_huge_get_and_clear(args->mm, vaddr, args->pmdp); |
251 | pmd = READ_ONCE(*args->pmdp); | |
a5c3b9ff AK |
252 | WARN_ON(!pmd_none(pmd)); |
253 | ||
c0fe07b0 | 254 | pmd = pfn_pmd(args->pmd_pfn, args->page_prot); |
a5c3b9ff AK |
255 | pmd = pmd_wrprotect(pmd); |
256 | pmd = pmd_mkclean(pmd); | |
c0fe07b0 | 257 | set_pmd_at(args->mm, vaddr, args->pmdp, pmd); |
8c5b3a8a | 258 | flush_dcache_page(page); |
a5c3b9ff AK |
259 | pmd = pmd_mkwrite(pmd); |
260 | pmd = pmd_mkdirty(pmd); | |
c0fe07b0 GS |
261 | pmdp_set_access_flags(args->vma, vaddr, args->pmdp, pmd, 1); |
262 | pmd = READ_ONCE(*args->pmdp); | |
a5c3b9ff | 263 | WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); |
c0fe07b0 GS |
264 | pmdp_huge_get_and_clear_full(args->vma, vaddr, args->pmdp, 1); |
265 | pmd = READ_ONCE(*args->pmdp); | |
a5c3b9ff AK |
266 | WARN_ON(!pmd_none(pmd)); |
267 | ||
c0fe07b0 | 268 | pmd = pmd_mkhuge(pfn_pmd(args->pmd_pfn, args->page_prot)); |
a5c3b9ff | 269 | pmd = pmd_mkyoung(pmd); |
c0fe07b0 | 270 | set_pmd_at(args->mm, vaddr, args->pmdp, pmd); |
8c5b3a8a | 271 | flush_dcache_page(page); |
c0fe07b0 GS |
272 | pmdp_test_and_clear_young(args->vma, vaddr, args->pmdp); |
273 | pmd = READ_ONCE(*args->pmdp); | |
a5c3b9ff | 274 | WARN_ON(pmd_young(pmd)); |
87f34986 | 275 | |
13af0506 | 276 | /* Clear the pte entries */ |
c0fe07b0 GS |
277 | pmdp_huge_get_and_clear(args->mm, vaddr, args->pmdp); |
278 | pgtable_trans_huge_withdraw(args->mm, args->pmdp); | |
a5c3b9ff AK |
279 | } |
280 | ||
8983d231 | 281 | static void __init pmd_leaf_tests(struct pgtable_debug_args *args) |
a5c3b9ff | 282 | { |
65ac1a60 AK |
283 | pmd_t pmd; |
284 | ||
285 | if (!has_transparent_hugepage()) | |
286 | return; | |
a5c3b9ff | 287 | |
6315df41 | 288 | pr_debug("Validating PMD leaf\n"); |
8983d231 | 289 | pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
65ac1a60 | 290 | |
a5c3b9ff AK |
291 | /* |
292 | * PMD based THP is a leaf entry. | |
293 | */ | |
294 | pmd = pmd_mkhuge(pmd); | |
295 | WARN_ON(!pmd_leaf(pmd)); | |
296 | } | |
297 | ||
399145f9 | 298 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
36b77d1e | 299 | static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx) |
399145f9 | 300 | { |
31d17076 | 301 | pgprot_t prot = vm_get_page_prot(idx); |
2e326c07 | 302 | unsigned long val = idx, *ptr = &val; |
65ac1a60 | 303 | pud_t pud; |
399145f9 | 304 | |
787d563b AK |
305 | if (!has_transparent_hugepage()) |
306 | return; | |
307 | ||
2e326c07 | 308 | pr_debug("Validating PUD basic (%pGv)\n", ptr); |
36b77d1e | 309 | pud = pfn_pud(args->fixed_pud_pfn, prot); |
bb5c47ce AK |
310 | |
311 | /* | |
312 | * This test needs to be executed after the given page table entry | |
31d17076 | 313 | * is created with pfn_pud() to make sure that vm_get_page_prot(idx) |
bb5c47ce AK |
314 | * does not have the dirty bit enabled from the beginning. This is |
315 | * important for platforms like arm64 where (!PTE_RDONLY) indicate | |
316 | * dirty bit being set. | |
317 | */ | |
318 | WARN_ON(pud_dirty(pud_wrprotect(pud))); | |
319 | ||
399145f9 AK |
320 | WARN_ON(!pud_same(pud, pud)); |
321 | WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud)))); | |
bb5c47ce AK |
322 | WARN_ON(!pud_dirty(pud_mkdirty(pud_mkclean(pud)))); |
323 | WARN_ON(pud_dirty(pud_mkclean(pud_mkdirty(pud)))); | |
399145f9 AK |
324 | WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud)))); |
325 | WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud)))); | |
326 | WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud)))); | |
bb5c47ce AK |
327 | WARN_ON(pud_dirty(pud_wrprotect(pud_mkclean(pud)))); |
328 | WARN_ON(!pud_dirty(pud_wrprotect(pud_mkdirty(pud)))); | |
399145f9 | 329 | |
36b77d1e | 330 | if (mm_pmd_folded(args->mm)) |
399145f9 AK |
331 | return; |
332 | ||
333 | /* | |
334 | * A huge page does not point to next level page table | |
335 | * entry. Hence this must qualify as pud_bad(). | |
336 | */ | |
337 | WARN_ON(!pud_bad(pud_mkhuge(pud))); | |
338 | } | |
a5c3b9ff | 339 | |
4cbde03b | 340 | static void __init pud_advanced_tests(struct pgtable_debug_args *args) |
a5c3b9ff | 341 | { |
8c5b3a8a | 342 | struct page *page; |
4cbde03b | 343 | unsigned long vaddr = args->vaddr; |
65ac1a60 | 344 | pud_t pud; |
a5c3b9ff AK |
345 | |
346 | if (!has_transparent_hugepage()) | |
347 | return; | |
348 | ||
8c5b3a8a GS |
349 | page = (args->pud_pfn != ULONG_MAX) ? pfn_to_page(args->pud_pfn) : NULL; |
350 | if (!page) | |
4cbde03b GS |
351 | return; |
352 | ||
8c5b3a8a GS |
353 | /* |
354 | * flush_dcache_page() is called after set_pud_at() to clear | |
355 | * PG_arch_1 for the page on ARM64. The page flag isn't cleared | |
356 | * when it's released and page allocation check will fail when | |
357 | * the page is allocated again. For architectures other than ARM64, | |
358 | * the unexpected overhead of cache flushing is acceptable. | |
359 | */ | |
6315df41 | 360 | pr_debug("Validating PUD advanced\n"); |
a5c3b9ff | 361 | /* Align the address wrt HPAGE_PUD_SIZE */ |
04f7ce3f | 362 | vaddr &= HPAGE_PUD_MASK; |
a5c3b9ff | 363 | |
4cbde03b GS |
364 | pud = pfn_pud(args->pud_pfn, args->page_prot); |
365 | set_pud_at(args->mm, vaddr, args->pudp, pud); | |
8c5b3a8a | 366 | flush_dcache_page(page); |
4cbde03b GS |
367 | pudp_set_wrprotect(args->mm, vaddr, args->pudp); |
368 | pud = READ_ONCE(*args->pudp); | |
a5c3b9ff AK |
369 | WARN_ON(pud_write(pud)); |
370 | ||
371 | #ifndef __PAGETABLE_PMD_FOLDED | |
4cbde03b GS |
372 | pudp_huge_get_and_clear(args->mm, vaddr, args->pudp); |
373 | pud = READ_ONCE(*args->pudp); | |
a5c3b9ff | 374 | WARN_ON(!pud_none(pud)); |
a5c3b9ff | 375 | #endif /* __PAGETABLE_PMD_FOLDED */ |
4cbde03b | 376 | pud = pfn_pud(args->pud_pfn, args->page_prot); |
a5c3b9ff AK |
377 | pud = pud_wrprotect(pud); |
378 | pud = pud_mkclean(pud); | |
4cbde03b | 379 | set_pud_at(args->mm, vaddr, args->pudp, pud); |
8c5b3a8a | 380 | flush_dcache_page(page); |
a5c3b9ff AK |
381 | pud = pud_mkwrite(pud); |
382 | pud = pud_mkdirty(pud); | |
4cbde03b GS |
383 | pudp_set_access_flags(args->vma, vaddr, args->pudp, pud, 1); |
384 | pud = READ_ONCE(*args->pudp); | |
a5c3b9ff AK |
385 | WARN_ON(!(pud_write(pud) && pud_dirty(pud))); |
386 | ||
c3824e18 | 387 | #ifndef __PAGETABLE_PMD_FOLDED |
4cbde03b GS |
388 | pudp_huge_get_and_clear_full(args->mm, vaddr, args->pudp, 1); |
389 | pud = READ_ONCE(*args->pudp); | |
c3824e18 AK |
390 | WARN_ON(!pud_none(pud)); |
391 | #endif /* __PAGETABLE_PMD_FOLDED */ | |
392 | ||
4cbde03b | 393 | pud = pfn_pud(args->pud_pfn, args->page_prot); |
a5c3b9ff | 394 | pud = pud_mkyoung(pud); |
4cbde03b | 395 | set_pud_at(args->mm, vaddr, args->pudp, pud); |
8c5b3a8a | 396 | flush_dcache_page(page); |
4cbde03b GS |
397 | pudp_test_and_clear_young(args->vma, vaddr, args->pudp); |
398 | pud = READ_ONCE(*args->pudp); | |
a5c3b9ff | 399 | WARN_ON(pud_young(pud)); |
13af0506 | 400 | |
4cbde03b | 401 | pudp_huge_get_and_clear(args->mm, vaddr, args->pudp); |
a5c3b9ff AK |
402 | } |
403 | ||
8983d231 | 404 | static void __init pud_leaf_tests(struct pgtable_debug_args *args) |
a5c3b9ff | 405 | { |
65ac1a60 AK |
406 | pud_t pud; |
407 | ||
408 | if (!has_transparent_hugepage()) | |
409 | return; | |
a5c3b9ff | 410 | |
6315df41 | 411 | pr_debug("Validating PUD leaf\n"); |
8983d231 | 412 | pud = pfn_pud(args->fixed_pud_pfn, args->page_prot); |
a5c3b9ff AK |
413 | /* |
414 | * PUD based THP is a leaf entry. | |
415 | */ | |
416 | pud = pud_mkhuge(pud); | |
417 | WARN_ON(!pud_leaf(pud)); | |
418 | } | |
399145f9 | 419 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
36b77d1e | 420 | static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx) { } |
4cbde03b | 421 | static void __init pud_advanced_tests(struct pgtable_debug_args *args) { } |
8983d231 | 422 | static void __init pud_leaf_tests(struct pgtable_debug_args *args) { } |
399145f9 AK |
423 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
424 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
36b77d1e GS |
425 | static void __init pmd_basic_tests(struct pgtable_debug_args *args, int idx) { } |
426 | static void __init pud_basic_tests(struct pgtable_debug_args *args, int idx) { } | |
c0fe07b0 | 427 | static void __init pmd_advanced_tests(struct pgtable_debug_args *args) { } |
4cbde03b | 428 | static void __init pud_advanced_tests(struct pgtable_debug_args *args) { } |
8983d231 GS |
429 | static void __init pmd_leaf_tests(struct pgtable_debug_args *args) { } |
430 | static void __init pud_leaf_tests(struct pgtable_debug_args *args) { } | |
5fe77be6 SL |
431 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
432 | ||
433 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP | |
c0fe07b0 | 434 | static void __init pmd_huge_tests(struct pgtable_debug_args *args) |
a5c3b9ff | 435 | { |
5fe77be6 SL |
436 | pmd_t pmd; |
437 | ||
c4876ff6 FL |
438 | if (!arch_vmap_pmd_supported(args->page_prot) || |
439 | args->fixed_alignment < PMD_SIZE) | |
5fe77be6 SL |
440 | return; |
441 | ||
442 | pr_debug("Validating PMD huge\n"); | |
443 | /* | |
444 | * X86 defined pmd_set_huge() verifies that the given | |
445 | * PMD is not a populated non-leaf entry. | |
446 | */ | |
c0fe07b0 GS |
447 | WRITE_ONCE(*args->pmdp, __pmd(0)); |
448 | WARN_ON(!pmd_set_huge(args->pmdp, __pfn_to_phys(args->fixed_pmd_pfn), args->page_prot)); | |
449 | WARN_ON(!pmd_clear_huge(args->pmdp)); | |
450 | pmd = READ_ONCE(*args->pmdp); | |
5fe77be6 | 451 | WARN_ON(!pmd_none(pmd)); |
a5c3b9ff | 452 | } |
5fe77be6 | 453 | |
4cbde03b | 454 | static void __init pud_huge_tests(struct pgtable_debug_args *args) |
a5c3b9ff | 455 | { |
5fe77be6 SL |
456 | pud_t pud; |
457 | ||
c4876ff6 FL |
458 | if (!arch_vmap_pud_supported(args->page_prot) || |
459 | args->fixed_alignment < PUD_SIZE) | |
5fe77be6 SL |
460 | return; |
461 | ||
462 | pr_debug("Validating PUD huge\n"); | |
463 | /* | |
464 | * X86 defined pud_set_huge() verifies that the given | |
465 | * PUD is not a populated non-leaf entry. | |
466 | */ | |
4cbde03b GS |
467 | WRITE_ONCE(*args->pudp, __pud(0)); |
468 | WARN_ON(!pud_set_huge(args->pudp, __pfn_to_phys(args->fixed_pud_pfn), args->page_prot)); | |
469 | WARN_ON(!pud_clear_huge(args->pudp)); | |
470 | pud = READ_ONCE(*args->pudp); | |
5fe77be6 | 471 | WARN_ON(!pud_none(pud)); |
a5c3b9ff | 472 | } |
5fe77be6 | 473 | #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ |
c0fe07b0 | 474 | static void __init pmd_huge_tests(struct pgtable_debug_args *args) { } |
4cbde03b | 475 | static void __init pud_huge_tests(struct pgtable_debug_args *args) { } |
5fe77be6 | 476 | #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ |
399145f9 | 477 | |
36b77d1e | 478 | static void __init p4d_basic_tests(struct pgtable_debug_args *args) |
399145f9 AK |
479 | { |
480 | p4d_t p4d; | |
481 | ||
6315df41 | 482 | pr_debug("Validating P4D basic\n"); |
399145f9 AK |
483 | memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t)); |
484 | WARN_ON(!p4d_same(p4d, p4d)); | |
485 | } | |
486 | ||
36b77d1e | 487 | static void __init pgd_basic_tests(struct pgtable_debug_args *args) |
399145f9 AK |
488 | { |
489 | pgd_t pgd; | |
490 | ||
6315df41 | 491 | pr_debug("Validating PGD basic\n"); |
399145f9 AK |
492 | memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t)); |
493 | WARN_ON(!pgd_same(pgd, pgd)); | |
494 | } | |
495 | ||
496 | #ifndef __PAGETABLE_PUD_FOLDED | |
4cbde03b | 497 | static void __init pud_clear_tests(struct pgtable_debug_args *args) |
399145f9 | 498 | { |
4cbde03b | 499 | pud_t pud = READ_ONCE(*args->pudp); |
399145f9 | 500 | |
4cbde03b | 501 | if (mm_pmd_folded(args->mm)) |
399145f9 AK |
502 | return; |
503 | ||
6315df41 | 504 | pr_debug("Validating PUD clear\n"); |
399145f9 | 505 | pud = __pud(pud_val(pud) | RANDOM_ORVALUE); |
4cbde03b GS |
506 | WRITE_ONCE(*args->pudp, pud); |
507 | pud_clear(args->pudp); | |
508 | pud = READ_ONCE(*args->pudp); | |
399145f9 AK |
509 | WARN_ON(!pud_none(pud)); |
510 | } | |
511 | ||
4cbde03b | 512 | static void __init pud_populate_tests(struct pgtable_debug_args *args) |
399145f9 AK |
513 | { |
514 | pud_t pud; | |
515 | ||
4cbde03b | 516 | if (mm_pmd_folded(args->mm)) |
399145f9 | 517 | return; |
6315df41 AK |
518 | |
519 | pr_debug("Validating PUD populate\n"); | |
399145f9 AK |
520 | /* |
521 | * This entry points to next level page table page. | |
522 | * Hence this must not qualify as pud_bad(). | |
523 | */ | |
4cbde03b GS |
524 | pud_populate(args->mm, args->pudp, args->start_pmdp); |
525 | pud = READ_ONCE(*args->pudp); | |
399145f9 AK |
526 | WARN_ON(pud_bad(pud)); |
527 | } | |
528 | #else /* !__PAGETABLE_PUD_FOLDED */ | |
4cbde03b GS |
529 | static void __init pud_clear_tests(struct pgtable_debug_args *args) { } |
530 | static void __init pud_populate_tests(struct pgtable_debug_args *args) { } | |
399145f9 AK |
531 | #endif /* PAGETABLE_PUD_FOLDED */ |
532 | ||
533 | #ifndef __PAGETABLE_P4D_FOLDED | |
2f87f8c3 | 534 | static void __init p4d_clear_tests(struct pgtable_debug_args *args) |
399145f9 | 535 | { |
2f87f8c3 | 536 | p4d_t p4d = READ_ONCE(*args->p4dp); |
399145f9 | 537 | |
2f87f8c3 | 538 | if (mm_pud_folded(args->mm)) |
399145f9 AK |
539 | return; |
540 | ||
6315df41 | 541 | pr_debug("Validating P4D clear\n"); |
399145f9 | 542 | p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE); |
2f87f8c3 GS |
543 | WRITE_ONCE(*args->p4dp, p4d); |
544 | p4d_clear(args->p4dp); | |
545 | p4d = READ_ONCE(*args->p4dp); | |
399145f9 AK |
546 | WARN_ON(!p4d_none(p4d)); |
547 | } | |
548 | ||
2f87f8c3 | 549 | static void __init p4d_populate_tests(struct pgtable_debug_args *args) |
399145f9 AK |
550 | { |
551 | p4d_t p4d; | |
552 | ||
2f87f8c3 | 553 | if (mm_pud_folded(args->mm)) |
399145f9 AK |
554 | return; |
555 | ||
6315df41 | 556 | pr_debug("Validating P4D populate\n"); |
399145f9 AK |
557 | /* |
558 | * This entry points to next level page table page. | |
559 | * Hence this must not qualify as p4d_bad(). | |
560 | */ | |
2f87f8c3 GS |
561 | pud_clear(args->pudp); |
562 | p4d_clear(args->p4dp); | |
563 | p4d_populate(args->mm, args->p4dp, args->start_pudp); | |
564 | p4d = READ_ONCE(*args->p4dp); | |
399145f9 AK |
565 | WARN_ON(p4d_bad(p4d)); |
566 | } | |
567 | ||
2f87f8c3 | 568 | static void __init pgd_clear_tests(struct pgtable_debug_args *args) |
399145f9 | 569 | { |
2f87f8c3 | 570 | pgd_t pgd = READ_ONCE(*(args->pgdp)); |
399145f9 | 571 | |
2f87f8c3 | 572 | if (mm_p4d_folded(args->mm)) |
399145f9 AK |
573 | return; |
574 | ||
6315df41 | 575 | pr_debug("Validating PGD clear\n"); |
399145f9 | 576 | pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE); |
2f87f8c3 GS |
577 | WRITE_ONCE(*args->pgdp, pgd); |
578 | pgd_clear(args->pgdp); | |
579 | pgd = READ_ONCE(*args->pgdp); | |
399145f9 AK |
580 | WARN_ON(!pgd_none(pgd)); |
581 | } | |
582 | ||
2f87f8c3 | 583 | static void __init pgd_populate_tests(struct pgtable_debug_args *args) |
399145f9 AK |
584 | { |
585 | pgd_t pgd; | |
586 | ||
2f87f8c3 | 587 | if (mm_p4d_folded(args->mm)) |
399145f9 AK |
588 | return; |
589 | ||
6315df41 | 590 | pr_debug("Validating PGD populate\n"); |
399145f9 AK |
591 | /* |
592 | * This entry points to next level page table page. | |
593 | * Hence this must not qualify as pgd_bad(). | |
594 | */ | |
2f87f8c3 GS |
595 | p4d_clear(args->p4dp); |
596 | pgd_clear(args->pgdp); | |
597 | pgd_populate(args->mm, args->pgdp, args->start_p4dp); | |
598 | pgd = READ_ONCE(*args->pgdp); | |
399145f9 AK |
599 | WARN_ON(pgd_bad(pgd)); |
600 | } | |
601 | #else /* !__PAGETABLE_P4D_FOLDED */ | |
2f87f8c3 GS |
602 | static void __init p4d_clear_tests(struct pgtable_debug_args *args) { } |
603 | static void __init pgd_clear_tests(struct pgtable_debug_args *args) { } | |
604 | static void __init p4d_populate_tests(struct pgtable_debug_args *args) { } | |
605 | static void __init pgd_populate_tests(struct pgtable_debug_args *args) { } | |
399145f9 AK |
606 | #endif /* PAGETABLE_P4D_FOLDED */ |
607 | ||
44966c44 | 608 | static void __init pte_clear_tests(struct pgtable_debug_args *args) |
399145f9 | 609 | { |
8c5b3a8a | 610 | struct page *page; |
44966c44 GS |
611 | pte_t pte = pfn_pte(args->pte_pfn, args->page_prot); |
612 | ||
8c5b3a8a GS |
613 | page = (args->pte_pfn != ULONG_MAX) ? pfn_to_page(args->pte_pfn) : NULL; |
614 | if (!page) | |
44966c44 | 615 | return; |
399145f9 | 616 | |
8c5b3a8a GS |
617 | /* |
618 | * flush_dcache_page() is called after set_pte_at() to clear | |
619 | * PG_arch_1 for the page on ARM64. The page flag isn't cleared | |
620 | * when it's released and page allocation check will fail when | |
621 | * the page is allocated again. For architectures other than ARM64, | |
622 | * the unexpected overhead of cache flushing is acceptable. | |
623 | */ | |
6315df41 | 624 | pr_debug("Validating PTE clear\n"); |
9f2bad09 HD |
625 | if (WARN_ON(!args->ptep)) |
626 | return; | |
627 | ||
401035d5 | 628 | #ifndef CONFIG_RISCV |
399145f9 | 629 | pte = __pte(pte_val(pte) | RANDOM_ORVALUE); |
401035d5 | 630 | #endif |
44966c44 | 631 | set_pte_at(args->mm, args->vaddr, args->ptep, pte); |
8c5b3a8a | 632 | flush_dcache_page(page); |
399145f9 | 633 | barrier(); |
08d5b29e | 634 | ptep_clear(args->mm, args->vaddr, args->ptep); |
44966c44 | 635 | pte = ptep_get(args->ptep); |
399145f9 AK |
636 | WARN_ON(!pte_none(pte)); |
637 | } | |
638 | ||
c0fe07b0 | 639 | static void __init pmd_clear_tests(struct pgtable_debug_args *args) |
399145f9 | 640 | { |
c0fe07b0 | 641 | pmd_t pmd = READ_ONCE(*args->pmdp); |
399145f9 | 642 | |
6315df41 | 643 | pr_debug("Validating PMD clear\n"); |
399145f9 | 644 | pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE); |
c0fe07b0 GS |
645 | WRITE_ONCE(*args->pmdp, pmd); |
646 | pmd_clear(args->pmdp); | |
647 | pmd = READ_ONCE(*args->pmdp); | |
399145f9 AK |
648 | WARN_ON(!pmd_none(pmd)); |
649 | } | |
650 | ||
c0fe07b0 | 651 | static void __init pmd_populate_tests(struct pgtable_debug_args *args) |
399145f9 AK |
652 | { |
653 | pmd_t pmd; | |
654 | ||
6315df41 | 655 | pr_debug("Validating PMD populate\n"); |
399145f9 AK |
656 | /* |
657 | * This entry points to next level page table page. | |
658 | * Hence this must not qualify as pmd_bad(). | |
659 | */ | |
c0fe07b0 GS |
660 | pmd_populate(args->mm, args->pmdp, args->start_ptep); |
661 | pmd = READ_ONCE(*args->pmdp); | |
399145f9 AK |
662 | WARN_ON(pmd_bad(pmd)); |
663 | } | |
664 | ||
8cb183f2 | 665 | static void __init pte_special_tests(struct pgtable_debug_args *args) |
05289402 | 666 | { |
8cb183f2 | 667 | pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
05289402 AK |
668 | |
669 | if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL)) | |
670 | return; | |
671 | ||
6315df41 | 672 | pr_debug("Validating PTE special\n"); |
05289402 AK |
673 | WARN_ON(!pte_special(pte_mkspecial(pte))); |
674 | } | |
675 | ||
8cb183f2 | 676 | static void __init pte_protnone_tests(struct pgtable_debug_args *args) |
05289402 | 677 | { |
8cb183f2 | 678 | pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot_none); |
05289402 AK |
679 | |
680 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) | |
681 | return; | |
682 | ||
6315df41 | 683 | pr_debug("Validating PTE protnone\n"); |
05289402 AK |
684 | WARN_ON(!pte_protnone(pte)); |
685 | WARN_ON(!pte_present(pte)); | |
686 | } | |
687 | ||
688 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
8cb183f2 | 689 | static void __init pmd_protnone_tests(struct pgtable_debug_args *args) |
05289402 | 690 | { |
65ac1a60 | 691 | pmd_t pmd; |
05289402 AK |
692 | |
693 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) | |
694 | return; | |
695 | ||
65ac1a60 AK |
696 | if (!has_transparent_hugepage()) |
697 | return; | |
698 | ||
6315df41 | 699 | pr_debug("Validating PMD protnone\n"); |
8cb183f2 | 700 | pmd = pmd_mkhuge(pfn_pmd(args->fixed_pmd_pfn, args->page_prot_none)); |
05289402 AK |
701 | WARN_ON(!pmd_protnone(pmd)); |
702 | WARN_ON(!pmd_present(pmd)); | |
703 | } | |
704 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
8cb183f2 | 705 | static void __init pmd_protnone_tests(struct pgtable_debug_args *args) { } |
05289402 AK |
706 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
707 | ||
708 | #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP | |
8cb183f2 | 709 | static void __init pte_devmap_tests(struct pgtable_debug_args *args) |
05289402 | 710 | { |
8cb183f2 | 711 | pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
05289402 | 712 | |
6315df41 | 713 | pr_debug("Validating PTE devmap\n"); |
05289402 AK |
714 | WARN_ON(!pte_devmap(pte_mkdevmap(pte))); |
715 | } | |
716 | ||
717 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
8cb183f2 | 718 | static void __init pmd_devmap_tests(struct pgtable_debug_args *args) |
05289402 | 719 | { |
65ac1a60 AK |
720 | pmd_t pmd; |
721 | ||
722 | if (!has_transparent_hugepage()) | |
723 | return; | |
05289402 | 724 | |
6315df41 | 725 | pr_debug("Validating PMD devmap\n"); |
8cb183f2 | 726 | pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
05289402 AK |
727 | WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd))); |
728 | } | |
729 | ||
730 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
8cb183f2 | 731 | static void __init pud_devmap_tests(struct pgtable_debug_args *args) |
05289402 | 732 | { |
65ac1a60 AK |
733 | pud_t pud; |
734 | ||
735 | if (!has_transparent_hugepage()) | |
736 | return; | |
05289402 | 737 | |
6315df41 | 738 | pr_debug("Validating PUD devmap\n"); |
8cb183f2 | 739 | pud = pfn_pud(args->fixed_pud_pfn, args->page_prot); |
05289402 AK |
740 | WARN_ON(!pud_devmap(pud_mkdevmap(pud))); |
741 | } | |
742 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
8cb183f2 | 743 | static void __init pud_devmap_tests(struct pgtable_debug_args *args) { } |
05289402 AK |
744 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
745 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
8cb183f2 GS |
746 | static void __init pmd_devmap_tests(struct pgtable_debug_args *args) { } |
747 | static void __init pud_devmap_tests(struct pgtable_debug_args *args) { } | |
05289402 AK |
748 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
749 | #else | |
8cb183f2 GS |
750 | static void __init pte_devmap_tests(struct pgtable_debug_args *args) { } |
751 | static void __init pmd_devmap_tests(struct pgtable_debug_args *args) { } | |
752 | static void __init pud_devmap_tests(struct pgtable_debug_args *args) { } | |
05289402 AK |
753 | #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ |
754 | ||
5f447e80 | 755 | static void __init pte_soft_dirty_tests(struct pgtable_debug_args *args) |
05289402 | 756 | { |
5f447e80 | 757 | pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
05289402 AK |
758 | |
759 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
760 | return; | |
761 | ||
6315df41 | 762 | pr_debug("Validating PTE soft dirty\n"); |
05289402 AK |
763 | WARN_ON(!pte_soft_dirty(pte_mksoft_dirty(pte))); |
764 | WARN_ON(pte_soft_dirty(pte_clear_soft_dirty(pte))); | |
765 | } | |
766 | ||
5f447e80 | 767 | static void __init pte_swap_soft_dirty_tests(struct pgtable_debug_args *args) |
05289402 | 768 | { |
5f447e80 | 769 | pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
05289402 AK |
770 | |
771 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
772 | return; | |
773 | ||
6315df41 | 774 | pr_debug("Validating PTE swap soft dirty\n"); |
05289402 AK |
775 | WARN_ON(!pte_swp_soft_dirty(pte_swp_mksoft_dirty(pte))); |
776 | WARN_ON(pte_swp_soft_dirty(pte_swp_clear_soft_dirty(pte))); | |
777 | } | |
778 | ||
779 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
5f447e80 | 780 | static void __init pmd_soft_dirty_tests(struct pgtable_debug_args *args) |
05289402 | 781 | { |
65ac1a60 | 782 | pmd_t pmd; |
05289402 AK |
783 | |
784 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
785 | return; | |
786 | ||
65ac1a60 AK |
787 | if (!has_transparent_hugepage()) |
788 | return; | |
789 | ||
6315df41 | 790 | pr_debug("Validating PMD soft dirty\n"); |
5f447e80 | 791 | pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
05289402 AK |
792 | WARN_ON(!pmd_soft_dirty(pmd_mksoft_dirty(pmd))); |
793 | WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd))); | |
794 | } | |
795 | ||
5f447e80 | 796 | static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) |
05289402 | 797 | { |
65ac1a60 | 798 | pmd_t pmd; |
05289402 AK |
799 | |
800 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) || | |
801 | !IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION)) | |
802 | return; | |
803 | ||
65ac1a60 AK |
804 | if (!has_transparent_hugepage()) |
805 | return; | |
806 | ||
6315df41 | 807 | pr_debug("Validating PMD swap soft dirty\n"); |
5f447e80 | 808 | pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
05289402 AK |
809 | WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd))); |
810 | WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd))); | |
811 | } | |
b593b90d | 812 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
5f447e80 GS |
813 | static void __init pmd_soft_dirty_tests(struct pgtable_debug_args *args) { } |
814 | static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) { } | |
b593b90d | 815 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
05289402 | 816 | |
210d1e8a DH |
817 | static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args) |
818 | { | |
2321ba3e DH |
819 | unsigned long max_swap_offset; |
820 | swp_entry_t entry, entry2; | |
821 | pte_t pte; | |
210d1e8a DH |
822 | |
823 | pr_debug("Validating PTE swap exclusive\n"); | |
2321ba3e DH |
824 | |
825 | /* See generic_max_swapfile_size(): probe the maximum offset */ | |
826 | max_swap_offset = swp_offset(pte_to_swp_entry(swp_entry_to_pte(swp_entry(0, ~0UL)))); | |
827 | ||
828 | /* Create a swp entry with all possible bits set */ | |
829 | entry = swp_entry((1 << MAX_SWAPFILES_SHIFT) - 1, max_swap_offset); | |
830 | ||
831 | pte = swp_entry_to_pte(entry); | |
832 | WARN_ON(pte_swp_exclusive(pte)); | |
833 | WARN_ON(!is_swap_pte(pte)); | |
834 | entry2 = pte_to_swp_entry(pte); | |
835 | WARN_ON(memcmp(&entry, &entry2, sizeof(entry))); | |
836 | ||
210d1e8a DH |
837 | pte = pte_swp_mkexclusive(pte); |
838 | WARN_ON(!pte_swp_exclusive(pte)); | |
2321ba3e DH |
839 | WARN_ON(!is_swap_pte(pte)); |
840 | WARN_ON(pte_swp_soft_dirty(pte)); | |
841 | entry2 = pte_to_swp_entry(pte); | |
842 | WARN_ON(memcmp(&entry, &entry2, sizeof(entry))); | |
843 | ||
210d1e8a DH |
844 | pte = pte_swp_clear_exclusive(pte); |
845 | WARN_ON(pte_swp_exclusive(pte)); | |
2321ba3e DH |
846 | WARN_ON(!is_swap_pte(pte)); |
847 | entry2 = pte_to_swp_entry(pte); | |
848 | WARN_ON(memcmp(&entry, &entry2, sizeof(entry))); | |
210d1e8a DH |
849 | } |
850 | ||
5f447e80 | 851 | static void __init pte_swap_tests(struct pgtable_debug_args *args) |
05289402 AK |
852 | { |
853 | swp_entry_t swp; | |
854 | pte_t pte; | |
855 | ||
6315df41 | 856 | pr_debug("Validating PTE swap\n"); |
5f447e80 | 857 | pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); |
05289402 AK |
858 | swp = __pte_to_swp_entry(pte); |
859 | pte = __swp_entry_to_pte(swp); | |
5f447e80 | 860 | WARN_ON(args->fixed_pte_pfn != pte_pfn(pte)); |
05289402 AK |
861 | } |
862 | ||
863 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
5f447e80 | 864 | static void __init pmd_swap_tests(struct pgtable_debug_args *args) |
05289402 AK |
865 | { |
866 | swp_entry_t swp; | |
867 | pmd_t pmd; | |
868 | ||
65ac1a60 AK |
869 | if (!has_transparent_hugepage()) |
870 | return; | |
871 | ||
6315df41 | 872 | pr_debug("Validating PMD swap\n"); |
5f447e80 | 873 | pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
05289402 AK |
874 | swp = __pmd_to_swp_entry(pmd); |
875 | pmd = __swp_entry_to_pmd(swp); | |
5f447e80 | 876 | WARN_ON(args->fixed_pmd_pfn != pmd_pfn(pmd)); |
05289402 AK |
877 | } |
878 | #else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */ | |
5f447e80 | 879 | static void __init pmd_swap_tests(struct pgtable_debug_args *args) { } |
05289402 AK |
880 | #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ |
881 | ||
4878a888 | 882 | static void __init swap_migration_tests(struct pgtable_debug_args *args) |
05289402 AK |
883 | { |
884 | struct page *page; | |
885 | swp_entry_t swp; | |
886 | ||
887 | if (!IS_ENABLED(CONFIG_MIGRATION)) | |
888 | return; | |
6315df41 | 889 | |
05289402 AK |
890 | /* |
891 | * swap_migration_tests() requires a dedicated page as it needs to | |
892 | * be locked before creating a migration entry from it. Locking the | |
893 | * page that actually maps kernel text ('start_kernel') can be real | |
4878a888 GS |
894 | * problematic. Lets use the allocated page explicitly for this |
895 | * purpose. | |
05289402 | 896 | */ |
4878a888 GS |
897 | page = (args->pte_pfn != ULONG_MAX) ? pfn_to_page(args->pte_pfn) : NULL; |
898 | if (!page) | |
05289402 | 899 | return; |
4878a888 GS |
900 | |
901 | pr_debug("Validating swap migration\n"); | |
05289402 AK |
902 | |
903 | /* | |
23647618 AK |
904 | * make_[readable|writable]_migration_entry() expects given page to |
905 | * be locked, otherwise it stumbles upon a BUG_ON(). | |
05289402 AK |
906 | */ |
907 | __SetPageLocked(page); | |
4dd845b5 | 908 | swp = make_writable_migration_entry(page_to_pfn(page)); |
05289402 | 909 | WARN_ON(!is_migration_entry(swp)); |
4dd845b5 | 910 | WARN_ON(!is_writable_migration_entry(swp)); |
05289402 | 911 | |
4dd845b5 | 912 | swp = make_readable_migration_entry(swp_offset(swp)); |
05289402 | 913 | WARN_ON(!is_migration_entry(swp)); |
4dd845b5 | 914 | WARN_ON(is_writable_migration_entry(swp)); |
05289402 | 915 | |
4dd845b5 | 916 | swp = make_readable_migration_entry(page_to_pfn(page)); |
05289402 | 917 | WARN_ON(!is_migration_entry(swp)); |
4dd845b5 | 918 | WARN_ON(is_writable_migration_entry(swp)); |
05289402 | 919 | __ClearPageLocked(page); |
05289402 AK |
920 | } |
921 | ||
922 | #ifdef CONFIG_HUGETLB_PAGE | |
36b77d1e | 923 | static void __init hugetlb_basic_tests(struct pgtable_debug_args *args) |
05289402 AK |
924 | { |
925 | struct page *page; | |
926 | pte_t pte; | |
927 | ||
6315df41 | 928 | pr_debug("Validating HugeTLB basic\n"); |
05289402 AK |
929 | /* |
930 | * Accessing the page associated with the pfn is safe here, | |
931 | * as it was previously derived from a real kernel symbol. | |
932 | */ | |
36b77d1e GS |
933 | page = pfn_to_page(args->fixed_pmd_pfn); |
934 | pte = mk_huge_pte(page, args->page_prot); | |
05289402 AK |
935 | |
936 | WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte))); | |
937 | WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte)))); | |
938 | WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte)))); | |
939 | ||
940 | #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB | |
36b77d1e | 941 | pte = pfn_pte(args->fixed_pmd_pfn, args->page_prot); |
05289402 | 942 | |
9dabf6e1 | 943 | WARN_ON(!pte_huge(arch_make_huge_pte(pte, PMD_SHIFT, VM_ACCESS_FLAGS))); |
05289402 AK |
944 | #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ |
945 | } | |
946 | #else /* !CONFIG_HUGETLB_PAGE */ | |
36b77d1e | 947 | static void __init hugetlb_basic_tests(struct pgtable_debug_args *args) { } |
05289402 AK |
948 | #endif /* CONFIG_HUGETLB_PAGE */ |
949 | ||
950 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
4878a888 | 951 | static void __init pmd_thp_tests(struct pgtable_debug_args *args) |
05289402 AK |
952 | { |
953 | pmd_t pmd; | |
954 | ||
955 | if (!has_transparent_hugepage()) | |
956 | return; | |
957 | ||
6315df41 | 958 | pr_debug("Validating PMD based THP\n"); |
05289402 AK |
959 | /* |
960 | * pmd_trans_huge() and pmd_present() must return positive after | |
961 | * MMU invalidation with pmd_mkinvalid(). This behavior is an | |
962 | * optimization for transparent huge page. pmd_trans_huge() must | |
963 | * be true if pmd_page() returns a valid THP to avoid taking the | |
964 | * pmd_lock when others walk over non transhuge pmds (i.e. there | |
965 | * are no THP allocated). Especially when splitting a THP and | |
966 | * removing the present bit from the pmd, pmd_trans_huge() still | |
967 | * needs to return true. pmd_present() should be true whenever | |
968 | * pmd_trans_huge() returns true. | |
969 | */ | |
4878a888 | 970 | pmd = pfn_pmd(args->fixed_pmd_pfn, args->page_prot); |
05289402 AK |
971 | WARN_ON(!pmd_trans_huge(pmd_mkhuge(pmd))); |
972 | ||
973 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE | |
974 | WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd)))); | |
975 | WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd)))); | |
976 | #endif /* __HAVE_ARCH_PMDP_INVALIDATE */ | |
977 | } | |
978 | ||
979 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
4878a888 | 980 | static void __init pud_thp_tests(struct pgtable_debug_args *args) |
05289402 AK |
981 | { |
982 | pud_t pud; | |
983 | ||
984 | if (!has_transparent_hugepage()) | |
985 | return; | |
986 | ||
6315df41 | 987 | pr_debug("Validating PUD based THP\n"); |
4878a888 | 988 | pud = pfn_pud(args->fixed_pud_pfn, args->page_prot); |
05289402 AK |
989 | WARN_ON(!pud_trans_huge(pud_mkhuge(pud))); |
990 | ||
991 | /* | |
992 | * pud_mkinvalid() has been dropped for now. Enable back | |
993 | * these tests when it comes back with a modified pud_present(). | |
994 | * | |
995 | * WARN_ON(!pud_trans_huge(pud_mkinvalid(pud_mkhuge(pud)))); | |
996 | * WARN_ON(!pud_present(pud_mkinvalid(pud_mkhuge(pud)))); | |
997 | */ | |
998 | } | |
999 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
4878a888 | 1000 | static void __init pud_thp_tests(struct pgtable_debug_args *args) { } |
05289402 AK |
1001 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
1002 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
4878a888 GS |
1003 | static void __init pmd_thp_tests(struct pgtable_debug_args *args) { } |
1004 | static void __init pud_thp_tests(struct pgtable_debug_args *args) { } | |
05289402 AK |
1005 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
1006 | ||
399145f9 AK |
1007 | static unsigned long __init get_random_vaddr(void) |
1008 | { | |
1009 | unsigned long random_vaddr, random_pages, total_user_pages; | |
1010 | ||
1011 | total_user_pages = (TASK_SIZE - FIRST_USER_ADDRESS) / PAGE_SIZE; | |
1012 | ||
1013 | random_pages = get_random_long() % total_user_pages; | |
1014 | random_vaddr = FIRST_USER_ADDRESS + random_pages * PAGE_SIZE; | |
1015 | ||
1016 | return random_vaddr; | |
1017 | } | |
1018 | ||
3c9b84f0 GS |
1019 | static void __init destroy_args(struct pgtable_debug_args *args) |
1020 | { | |
1021 | struct page *page = NULL; | |
1022 | ||
1023 | /* Free (huge) page */ | |
1024 | if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && | |
1025 | IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) && | |
1026 | has_transparent_hugepage() && | |
1027 | args->pud_pfn != ULONG_MAX) { | |
1028 | if (args->is_contiguous_page) { | |
1029 | free_contig_range(args->pud_pfn, | |
1030 | (1 << (HPAGE_PUD_SHIFT - PAGE_SHIFT))); | |
1031 | } else { | |
1032 | page = pfn_to_page(args->pud_pfn); | |
1033 | __free_pages(page, HPAGE_PUD_SHIFT - PAGE_SHIFT); | |
1034 | } | |
1035 | ||
1036 | args->pud_pfn = ULONG_MAX; | |
1037 | args->pmd_pfn = ULONG_MAX; | |
1038 | args->pte_pfn = ULONG_MAX; | |
1039 | } | |
1040 | ||
1041 | if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && | |
1042 | has_transparent_hugepage() && | |
1043 | args->pmd_pfn != ULONG_MAX) { | |
1044 | if (args->is_contiguous_page) { | |
1045 | free_contig_range(args->pmd_pfn, (1 << HPAGE_PMD_ORDER)); | |
1046 | } else { | |
1047 | page = pfn_to_page(args->pmd_pfn); | |
1048 | __free_pages(page, HPAGE_PMD_ORDER); | |
1049 | } | |
1050 | ||
1051 | args->pmd_pfn = ULONG_MAX; | |
1052 | args->pte_pfn = ULONG_MAX; | |
1053 | } | |
1054 | ||
1055 | if (args->pte_pfn != ULONG_MAX) { | |
1056 | page = pfn_to_page(args->pte_pfn); | |
dcc1be11 | 1057 | __free_page(page); |
3c9b84f0 GS |
1058 | |
1059 | args->pte_pfn = ULONG_MAX; | |
1060 | } | |
1061 | ||
1062 | /* Free page table entries */ | |
1063 | if (args->start_ptep) { | |
1064 | pte_free(args->mm, args->start_ptep); | |
1065 | mm_dec_nr_ptes(args->mm); | |
1066 | } | |
1067 | ||
1068 | if (args->start_pmdp) { | |
1069 | pmd_free(args->mm, args->start_pmdp); | |
1070 | mm_dec_nr_pmds(args->mm); | |
1071 | } | |
1072 | ||
1073 | if (args->start_pudp) { | |
1074 | pud_free(args->mm, args->start_pudp); | |
1075 | mm_dec_nr_puds(args->mm); | |
1076 | } | |
1077 | ||
1078 | if (args->start_p4dp) | |
1079 | p4d_free(args->mm, args->start_p4dp); | |
1080 | ||
1081 | /* Free vma and mm struct */ | |
1082 | if (args->vma) | |
1083 | vm_area_free(args->vma); | |
1084 | ||
1085 | if (args->mm) | |
1086 | mmdrop(args->mm); | |
1087 | } | |
1088 | ||
1089 | static struct page * __init | |
1090 | debug_vm_pgtable_alloc_huge_page(struct pgtable_debug_args *args, int order) | |
1091 | { | |
1092 | struct page *page = NULL; | |
1093 | ||
1094 | #ifdef CONFIG_CONTIG_ALLOC | |
23baf831 | 1095 | if (order > MAX_ORDER) { |
3c9b84f0 GS |
1096 | page = alloc_contig_pages((1 << order), GFP_KERNEL, |
1097 | first_online_node, NULL); | |
1098 | if (page) { | |
1099 | args->is_contiguous_page = true; | |
1100 | return page; | |
1101 | } | |
1102 | } | |
1103 | #endif | |
1104 | ||
23baf831 | 1105 | if (order <= MAX_ORDER) |
3c9b84f0 GS |
1106 | page = alloc_pages(GFP_KERNEL, order); |
1107 | ||
1108 | return page; | |
1109 | } | |
1110 | ||
c4876ff6 FL |
1111 | /* |
1112 | * Check if a physical memory range described by <pstart, pend> contains | |
1113 | * an area that is of size psize, and aligned to psize. | |
1114 | * | |
1115 | * Don't use address 0, an all-zeroes physical address might mask bugs, and | |
1116 | * it's not used on x86. | |
1117 | */ | |
1118 | static void __init phys_align_check(phys_addr_t pstart, | |
1119 | phys_addr_t pend, unsigned long psize, | |
1120 | phys_addr_t *physp, unsigned long *alignp) | |
1121 | { | |
1122 | phys_addr_t aligned_start, aligned_end; | |
1123 | ||
1124 | if (pstart == 0) | |
1125 | pstart = PAGE_SIZE; | |
1126 | ||
1127 | aligned_start = ALIGN(pstart, psize); | |
1128 | aligned_end = aligned_start + psize; | |
1129 | ||
1130 | if (aligned_end > aligned_start && aligned_end <= pend) { | |
1131 | *alignp = psize; | |
1132 | *physp = aligned_start; | |
1133 | } | |
1134 | } | |
1135 | ||
1136 | static void __init init_fixed_pfns(struct pgtable_debug_args *args) | |
1137 | { | |
1138 | u64 idx; | |
1139 | phys_addr_t phys, pstart, pend; | |
1140 | ||
1141 | /* | |
1142 | * Initialize the fixed pfns. To do this, try to find a | |
1143 | * valid physical range, preferably aligned to PUD_SIZE, | |
1144 | * but settling for aligned to PMD_SIZE as a fallback. If | |
1145 | * neither of those is found, use the physical address of | |
1146 | * the start_kernel symbol. | |
1147 | * | |
1148 | * The memory doesn't need to be allocated, it just needs to exist | |
1149 | * as usable memory. It won't be touched. | |
1150 | * | |
1151 | * The alignment is recorded, and can be checked to see if we | |
1152 | * can run the tests that require an actual valid physical | |
1153 | * address range on some architectures ({pmd,pud}_huge_test | |
1154 | * on x86). | |
1155 | */ | |
1156 | ||
1157 | phys = __pa_symbol(&start_kernel); | |
1158 | args->fixed_alignment = PAGE_SIZE; | |
1159 | ||
1160 | for_each_mem_range(idx, &pstart, &pend) { | |
1161 | /* First check for a PUD-aligned area */ | |
1162 | phys_align_check(pstart, pend, PUD_SIZE, &phys, | |
1163 | &args->fixed_alignment); | |
1164 | ||
1165 | /* If a PUD-aligned area is found, we're done */ | |
1166 | if (args->fixed_alignment == PUD_SIZE) | |
1167 | break; | |
1168 | ||
1169 | /* | |
1170 | * If no PMD-aligned area found yet, check for one, | |
1171 | * but continue the loop to look for a PUD-aligned area. | |
1172 | */ | |
1173 | if (args->fixed_alignment < PMD_SIZE) | |
1174 | phys_align_check(pstart, pend, PMD_SIZE, &phys, | |
1175 | &args->fixed_alignment); | |
1176 | } | |
1177 | ||
1178 | args->fixed_pgd_pfn = __phys_to_pfn(phys & PGDIR_MASK); | |
1179 | args->fixed_p4d_pfn = __phys_to_pfn(phys & P4D_MASK); | |
1180 | args->fixed_pud_pfn = __phys_to_pfn(phys & PUD_MASK); | |
1181 | args->fixed_pmd_pfn = __phys_to_pfn(phys & PMD_MASK); | |
1182 | args->fixed_pte_pfn = __phys_to_pfn(phys & PAGE_MASK); | |
1183 | WARN_ON(!pfn_valid(args->fixed_pte_pfn)); | |
1184 | } | |
1185 | ||
1186 | ||
3c9b84f0 GS |
1187 | static int __init init_args(struct pgtable_debug_args *args) |
1188 | { | |
1189 | struct page *page = NULL; | |
3c9b84f0 GS |
1190 | int ret = 0; |
1191 | ||
1192 | /* | |
1193 | * Initialize the debugging data. | |
1194 | * | |
31d17076 AK |
1195 | * vm_get_page_prot(VM_NONE) or vm_get_page_prot(VM_SHARED|VM_NONE) |
1196 | * will help create page table entries with PROT_NONE permission as | |
1197 | * required for pxx_protnone_tests(). | |
3c9b84f0 GS |
1198 | */ |
1199 | memset(args, 0, sizeof(*args)); | |
1200 | args->vaddr = get_random_vaddr(); | |
d7e679b6 | 1201 | args->page_prot = vm_get_page_prot(VM_ACCESS_FLAGS); |
31d17076 | 1202 | args->page_prot_none = vm_get_page_prot(VM_NONE); |
3c9b84f0 GS |
1203 | args->is_contiguous_page = false; |
1204 | args->pud_pfn = ULONG_MAX; | |
1205 | args->pmd_pfn = ULONG_MAX; | |
1206 | args->pte_pfn = ULONG_MAX; | |
1207 | args->fixed_pgd_pfn = ULONG_MAX; | |
1208 | args->fixed_p4d_pfn = ULONG_MAX; | |
1209 | args->fixed_pud_pfn = ULONG_MAX; | |
1210 | args->fixed_pmd_pfn = ULONG_MAX; | |
1211 | args->fixed_pte_pfn = ULONG_MAX; | |
1212 | ||
1213 | /* Allocate mm and vma */ | |
1214 | args->mm = mm_alloc(); | |
1215 | if (!args->mm) { | |
1216 | pr_err("Failed to allocate mm struct\n"); | |
1217 | ret = -ENOMEM; | |
1218 | goto error; | |
1219 | } | |
1220 | ||
1221 | args->vma = vm_area_alloc(args->mm); | |
1222 | if (!args->vma) { | |
1223 | pr_err("Failed to allocate vma\n"); | |
1224 | ret = -ENOMEM; | |
1225 | goto error; | |
1226 | } | |
1227 | ||
1228 | /* | |
1229 | * Allocate page table entries. They will be modified in the tests. | |
1230 | * Lets save the page table entries so that they can be released | |
1231 | * when the tests are completed. | |
1232 | */ | |
1233 | args->pgdp = pgd_offset(args->mm, args->vaddr); | |
1234 | args->p4dp = p4d_alloc(args->mm, args->pgdp, args->vaddr); | |
1235 | if (!args->p4dp) { | |
1236 | pr_err("Failed to allocate p4d entries\n"); | |
1237 | ret = -ENOMEM; | |
1238 | goto error; | |
1239 | } | |
1240 | args->start_p4dp = p4d_offset(args->pgdp, 0UL); | |
1241 | WARN_ON(!args->start_p4dp); | |
1242 | ||
1243 | args->pudp = pud_alloc(args->mm, args->p4dp, args->vaddr); | |
1244 | if (!args->pudp) { | |
1245 | pr_err("Failed to allocate pud entries\n"); | |
1246 | ret = -ENOMEM; | |
1247 | goto error; | |
1248 | } | |
1249 | args->start_pudp = pud_offset(args->p4dp, 0UL); | |
1250 | WARN_ON(!args->start_pudp); | |
1251 | ||
1252 | args->pmdp = pmd_alloc(args->mm, args->pudp, args->vaddr); | |
1253 | if (!args->pmdp) { | |
1254 | pr_err("Failed to allocate pmd entries\n"); | |
1255 | ret = -ENOMEM; | |
1256 | goto error; | |
1257 | } | |
1258 | args->start_pmdp = pmd_offset(args->pudp, 0UL); | |
1259 | WARN_ON(!args->start_pmdp); | |
1260 | ||
1261 | if (pte_alloc(args->mm, args->pmdp)) { | |
1262 | pr_err("Failed to allocate pte entries\n"); | |
1263 | ret = -ENOMEM; | |
1264 | goto error; | |
1265 | } | |
1266 | args->start_ptep = pmd_pgtable(READ_ONCE(*args->pmdp)); | |
1267 | WARN_ON(!args->start_ptep); | |
1268 | ||
c4876ff6 | 1269 | init_fixed_pfns(args); |
3c9b84f0 GS |
1270 | |
1271 | /* | |
1272 | * Allocate (huge) pages because some of the tests need to access | |
1273 | * the data in the pages. The corresponding tests will be skipped | |
1274 | * if we fail to allocate (huge) pages. | |
1275 | */ | |
1276 | if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && | |
1277 | IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) && | |
1278 | has_transparent_hugepage()) { | |
1279 | page = debug_vm_pgtable_alloc_huge_page(args, | |
1280 | HPAGE_PUD_SHIFT - PAGE_SHIFT); | |
1281 | if (page) { | |
1282 | args->pud_pfn = page_to_pfn(page); | |
1283 | args->pmd_pfn = args->pud_pfn; | |
1284 | args->pte_pfn = args->pud_pfn; | |
1285 | return 0; | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && | |
1290 | has_transparent_hugepage()) { | |
1291 | page = debug_vm_pgtable_alloc_huge_page(args, HPAGE_PMD_ORDER); | |
1292 | if (page) { | |
1293 | args->pmd_pfn = page_to_pfn(page); | |
1294 | args->pte_pfn = args->pmd_pfn; | |
1295 | return 0; | |
1296 | } | |
1297 | } | |
1298 | ||
dcc1be11 | 1299 | page = alloc_page(GFP_KERNEL); |
3c9b84f0 GS |
1300 | if (page) |
1301 | args->pte_pfn = page_to_pfn(page); | |
1302 | ||
1303 | return 0; | |
1304 | ||
1305 | error: | |
1306 | destroy_args(args); | |
1307 | return ret; | |
1308 | } | |
1309 | ||
399145f9 AK |
1310 | static int __init debug_vm_pgtable(void) |
1311 | { | |
3c9b84f0 | 1312 | struct pgtable_debug_args args; |
fea1120c | 1313 | spinlock_t *ptl = NULL; |
3c9b84f0 | 1314 | int idx, ret; |
399145f9 AK |
1315 | |
1316 | pr_info("Validating architecture page table helpers\n"); | |
3c9b84f0 GS |
1317 | ret = init_args(&args); |
1318 | if (ret) | |
1319 | return ret; | |
1320 | ||
2e326c07 | 1321 | /* |
31d17076 | 1322 | * Iterate over each possible vm_flags to make sure that all |
2e326c07 AK |
1323 | * the basic page table transformation validations just hold |
1324 | * true irrespective of the starting protection value for a | |
1325 | * given page table entry. | |
31d17076 AK |
1326 | * |
1327 | * Protection based vm_flags combinatins are always linear | |
1328 | * and increasing i.e starting from VM_NONE and going upto | |
1329 | * (VM_SHARED | READ | WRITE | EXEC). | |
2e326c07 | 1330 | */ |
31d17076 AK |
1331 | #define VM_FLAGS_START (VM_NONE) |
1332 | #define VM_FLAGS_END (VM_SHARED | VM_EXEC | VM_WRITE | VM_READ) | |
1333 | ||
1334 | for (idx = VM_FLAGS_START; idx <= VM_FLAGS_END; idx++) { | |
36b77d1e GS |
1335 | pte_basic_tests(&args, idx); |
1336 | pmd_basic_tests(&args, idx); | |
1337 | pud_basic_tests(&args, idx); | |
2e326c07 AK |
1338 | } |
1339 | ||
1340 | /* | |
1341 | * Both P4D and PGD level tests are very basic which do not | |
1342 | * involve creating page table entries from the protection | |
1343 | * value and the given pfn. Hence just keep them out from | |
1344 | * the above iteration for now to save some test execution | |
1345 | * time. | |
1346 | */ | |
36b77d1e GS |
1347 | p4d_basic_tests(&args); |
1348 | pgd_basic_tests(&args); | |
399145f9 | 1349 | |
8983d231 GS |
1350 | pmd_leaf_tests(&args); |
1351 | pud_leaf_tests(&args); | |
a5c3b9ff | 1352 | |
8cb183f2 GS |
1353 | pte_special_tests(&args); |
1354 | pte_protnone_tests(&args); | |
1355 | pmd_protnone_tests(&args); | |
05289402 | 1356 | |
8cb183f2 GS |
1357 | pte_devmap_tests(&args); |
1358 | pmd_devmap_tests(&args); | |
1359 | pud_devmap_tests(&args); | |
05289402 | 1360 | |
5f447e80 GS |
1361 | pte_soft_dirty_tests(&args); |
1362 | pmd_soft_dirty_tests(&args); | |
1363 | pte_swap_soft_dirty_tests(&args); | |
1364 | pmd_swap_soft_dirty_tests(&args); | |
05289402 | 1365 | |
210d1e8a DH |
1366 | pte_swap_exclusive_tests(&args); |
1367 | ||
5f447e80 GS |
1368 | pte_swap_tests(&args); |
1369 | pmd_swap_tests(&args); | |
05289402 | 1370 | |
4878a888 | 1371 | swap_migration_tests(&args); |
05289402 | 1372 | |
4878a888 GS |
1373 | pmd_thp_tests(&args); |
1374 | pud_thp_tests(&args); | |
05289402 | 1375 | |
36b77d1e | 1376 | hugetlb_basic_tests(&args); |
e8edf0ad | 1377 | |
6f302e27 AK |
1378 | /* |
1379 | * Page table modifying tests. They need to hold | |
1380 | * proper page table lock. | |
1381 | */ | |
e8edf0ad | 1382 | |
44966c44 GS |
1383 | args.ptep = pte_offset_map_lock(args.mm, args.pmdp, args.vaddr, &ptl); |
1384 | pte_clear_tests(&args); | |
1385 | pte_advanced_tests(&args); | |
9f2bad09 HD |
1386 | if (args.ptep) |
1387 | pte_unmap_unlock(args.ptep, ptl); | |
e8edf0ad | 1388 | |
c0fe07b0 GS |
1389 | ptl = pmd_lock(args.mm, args.pmdp); |
1390 | pmd_clear_tests(&args); | |
1391 | pmd_advanced_tests(&args); | |
1392 | pmd_huge_tests(&args); | |
1393 | pmd_populate_tests(&args); | |
6f302e27 AK |
1394 | spin_unlock(ptl); |
1395 | ||
4cbde03b GS |
1396 | ptl = pud_lock(args.mm, args.pudp); |
1397 | pud_clear_tests(&args); | |
1398 | pud_advanced_tests(&args); | |
1399 | pud_huge_tests(&args); | |
1400 | pud_populate_tests(&args); | |
6f302e27 | 1401 | spin_unlock(ptl); |
e8edf0ad | 1402 | |
2f87f8c3 GS |
1403 | spin_lock(&(args.mm->page_table_lock)); |
1404 | p4d_clear_tests(&args); | |
1405 | pgd_clear_tests(&args); | |
1406 | p4d_populate_tests(&args); | |
1407 | pgd_populate_tests(&args); | |
1408 | spin_unlock(&(args.mm->page_table_lock)); | |
e8edf0ad | 1409 | |
3c9b84f0 | 1410 | destroy_args(&args); |
399145f9 AK |
1411 | return 0; |
1412 | } | |
1413 | late_initcall(debug_vm_pgtable); |