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