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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> | |
31 | #include <asm/pgalloc.h> | |
a5c3b9ff | 32 | #include <asm/tlbflush.h> |
399145f9 | 33 | |
b1d00007 AK |
34 | /* |
35 | * Please refer Documentation/vm/arch_pgtable_helpers.rst for the semantics | |
36 | * expectations that are being validated here. All future changes in here | |
37 | * or the documentation need to be in sync. | |
38 | */ | |
39 | ||
399145f9 AK |
40 | #define VMFLAGS (VM_READ|VM_WRITE|VM_EXEC) |
41 | ||
42 | /* | |
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 | |
47 | * have affect any other platform. | |
48 | */ | |
49 | #define S390_MASK_BITS 4 | |
50 | #define RANDOM_ORVALUE GENMASK(BITS_PER_LONG - 1, S390_MASK_BITS) | |
51 | #define RANDOM_NZVALUE GENMASK(7, 0) | |
52 | ||
53 | static void __init pte_basic_tests(unsigned long pfn, pgprot_t prot) | |
54 | { | |
55 | pte_t pte = pfn_pte(pfn, prot); | |
56 | ||
6315df41 | 57 | pr_debug("Validating PTE basic\n"); |
399145f9 AK |
58 | WARN_ON(!pte_same(pte, pte)); |
59 | WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte)))); | |
60 | WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte)))); | |
61 | WARN_ON(!pte_write(pte_mkwrite(pte_wrprotect(pte)))); | |
62 | WARN_ON(pte_young(pte_mkold(pte_mkyoung(pte)))); | |
63 | WARN_ON(pte_dirty(pte_mkclean(pte_mkdirty(pte)))); | |
64 | WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte)))); | |
65 | } | |
66 | ||
a5c3b9ff AK |
67 | static void __init pte_advanced_tests(struct mm_struct *mm, |
68 | struct vm_area_struct *vma, pte_t *ptep, | |
69 | unsigned long pfn, unsigned long vaddr, | |
70 | pgprot_t prot) | |
71 | { | |
72 | pte_t pte = pfn_pte(pfn, prot); | |
73 | ||
6315df41 | 74 | pr_debug("Validating PTE advanced\n"); |
a5c3b9ff AK |
75 | pte = pfn_pte(pfn, prot); |
76 | set_pte_at(mm, vaddr, ptep, pte); | |
77 | ptep_set_wrprotect(mm, vaddr, ptep); | |
78 | pte = ptep_get(ptep); | |
79 | WARN_ON(pte_write(pte)); | |
80 | ||
81 | pte = pfn_pte(pfn, prot); | |
82 | set_pte_at(mm, vaddr, ptep, pte); | |
83 | ptep_get_and_clear(mm, vaddr, ptep); | |
84 | pte = ptep_get(ptep); | |
85 | WARN_ON(!pte_none(pte)); | |
86 | ||
87 | pte = pfn_pte(pfn, prot); | |
88 | pte = pte_wrprotect(pte); | |
89 | pte = pte_mkclean(pte); | |
90 | set_pte_at(mm, vaddr, ptep, pte); | |
91 | pte = pte_mkwrite(pte); | |
92 | pte = pte_mkdirty(pte); | |
93 | ptep_set_access_flags(vma, vaddr, ptep, pte, 1); | |
94 | pte = ptep_get(ptep); | |
95 | WARN_ON(!(pte_write(pte) && pte_dirty(pte))); | |
96 | ||
97 | pte = pfn_pte(pfn, prot); | |
98 | set_pte_at(mm, vaddr, ptep, pte); | |
99 | ptep_get_and_clear_full(mm, vaddr, ptep, 1); | |
100 | pte = ptep_get(ptep); | |
101 | WARN_ON(!pte_none(pte)); | |
102 | ||
103 | pte = pte_mkyoung(pte); | |
104 | set_pte_at(mm, vaddr, ptep, pte); | |
105 | ptep_test_and_clear_young(vma, vaddr, ptep); | |
106 | pte = ptep_get(ptep); | |
107 | WARN_ON(pte_young(pte)); | |
108 | } | |
109 | ||
110 | static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot) | |
111 | { | |
112 | pte_t pte = pfn_pte(pfn, prot); | |
113 | ||
6315df41 | 114 | pr_debug("Validating PTE saved write\n"); |
a5c3b9ff AK |
115 | WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte)))); |
116 | WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte)))); | |
117 | } | |
399145f9 AK |
118 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
119 | static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot) | |
120 | { | |
121 | pmd_t pmd = pfn_pmd(pfn, prot); | |
122 | ||
787d563b AK |
123 | if (!has_transparent_hugepage()) |
124 | return; | |
125 | ||
6315df41 | 126 | pr_debug("Validating PMD basic\n"); |
399145f9 AK |
127 | WARN_ON(!pmd_same(pmd, pmd)); |
128 | WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd)))); | |
129 | WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd)))); | |
130 | WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd)))); | |
131 | WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd)))); | |
132 | WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd)))); | |
133 | WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd)))); | |
134 | /* | |
135 | * A huge page does not point to next level page table | |
136 | * entry. Hence this must qualify as pmd_bad(). | |
137 | */ | |
138 | WARN_ON(!pmd_bad(pmd_mkhuge(pmd))); | |
139 | } | |
140 | ||
a5c3b9ff AK |
141 | static void __init pmd_advanced_tests(struct mm_struct *mm, |
142 | struct vm_area_struct *vma, pmd_t *pmdp, | |
143 | unsigned long pfn, unsigned long vaddr, | |
144 | pgprot_t prot) | |
145 | { | |
146 | pmd_t pmd = pfn_pmd(pfn, prot); | |
147 | ||
148 | if (!has_transparent_hugepage()) | |
149 | return; | |
150 | ||
6315df41 | 151 | pr_debug("Validating PMD advanced\n"); |
a5c3b9ff AK |
152 | /* Align the address wrt HPAGE_PMD_SIZE */ |
153 | vaddr = (vaddr & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE; | |
154 | ||
155 | pmd = pfn_pmd(pfn, prot); | |
156 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
157 | pmdp_set_wrprotect(mm, vaddr, pmdp); | |
158 | pmd = READ_ONCE(*pmdp); | |
159 | WARN_ON(pmd_write(pmd)); | |
160 | ||
161 | pmd = pfn_pmd(pfn, prot); | |
162 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
163 | pmdp_huge_get_and_clear(mm, vaddr, pmdp); | |
164 | pmd = READ_ONCE(*pmdp); | |
165 | WARN_ON(!pmd_none(pmd)); | |
166 | ||
167 | pmd = pfn_pmd(pfn, prot); | |
168 | pmd = pmd_wrprotect(pmd); | |
169 | pmd = pmd_mkclean(pmd); | |
170 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
171 | pmd = pmd_mkwrite(pmd); | |
172 | pmd = pmd_mkdirty(pmd); | |
173 | pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1); | |
174 | pmd = READ_ONCE(*pmdp); | |
175 | WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); | |
176 | ||
177 | pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); | |
178 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
179 | pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1); | |
180 | pmd = READ_ONCE(*pmdp); | |
181 | WARN_ON(!pmd_none(pmd)); | |
182 | ||
183 | pmd = pmd_mkyoung(pmd); | |
184 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
185 | pmdp_test_and_clear_young(vma, vaddr, pmdp); | |
186 | pmd = READ_ONCE(*pmdp); | |
187 | WARN_ON(pmd_young(pmd)); | |
188 | } | |
189 | ||
190 | static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) | |
191 | { | |
192 | pmd_t pmd = pfn_pmd(pfn, prot); | |
193 | ||
6315df41 | 194 | pr_debug("Validating PMD leaf\n"); |
a5c3b9ff AK |
195 | /* |
196 | * PMD based THP is a leaf entry. | |
197 | */ | |
198 | pmd = pmd_mkhuge(pmd); | |
199 | WARN_ON(!pmd_leaf(pmd)); | |
200 | } | |
201 | ||
202 | static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) | |
203 | { | |
204 | pmd_t pmd; | |
205 | ||
206 | if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP)) | |
207 | return; | |
6315df41 AK |
208 | |
209 | pr_debug("Validating PMD huge\n"); | |
a5c3b9ff AK |
210 | /* |
211 | * X86 defined pmd_set_huge() verifies that the given | |
212 | * PMD is not a populated non-leaf entry. | |
213 | */ | |
214 | WRITE_ONCE(*pmdp, __pmd(0)); | |
215 | WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot)); | |
216 | WARN_ON(!pmd_clear_huge(pmdp)); | |
217 | pmd = READ_ONCE(*pmdp); | |
218 | WARN_ON(!pmd_none(pmd)); | |
219 | } | |
220 | ||
221 | static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) | |
222 | { | |
223 | pmd_t pmd = pfn_pmd(pfn, prot); | |
224 | ||
6315df41 | 225 | pr_debug("Validating PMD saved write\n"); |
a5c3b9ff AK |
226 | WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd)))); |
227 | WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd)))); | |
228 | } | |
229 | ||
399145f9 AK |
230 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
231 | static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) | |
232 | { | |
233 | pud_t pud = pfn_pud(pfn, prot); | |
234 | ||
787d563b AK |
235 | if (!has_transparent_hugepage()) |
236 | return; | |
237 | ||
6315df41 | 238 | pr_debug("Validating PUD basic\n"); |
399145f9 AK |
239 | WARN_ON(!pud_same(pud, pud)); |
240 | WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud)))); | |
241 | WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud)))); | |
242 | WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud)))); | |
243 | WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud)))); | |
244 | ||
245 | if (mm_pmd_folded(mm)) | |
246 | return; | |
247 | ||
248 | /* | |
249 | * A huge page does not point to next level page table | |
250 | * entry. Hence this must qualify as pud_bad(). | |
251 | */ | |
252 | WARN_ON(!pud_bad(pud_mkhuge(pud))); | |
253 | } | |
a5c3b9ff AK |
254 | |
255 | static void __init pud_advanced_tests(struct mm_struct *mm, | |
256 | struct vm_area_struct *vma, pud_t *pudp, | |
257 | unsigned long pfn, unsigned long vaddr, | |
258 | pgprot_t prot) | |
259 | { | |
260 | pud_t pud = pfn_pud(pfn, prot); | |
261 | ||
262 | if (!has_transparent_hugepage()) | |
263 | return; | |
264 | ||
6315df41 | 265 | pr_debug("Validating PUD advanced\n"); |
a5c3b9ff AK |
266 | /* Align the address wrt HPAGE_PUD_SIZE */ |
267 | vaddr = (vaddr & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE; | |
268 | ||
269 | set_pud_at(mm, vaddr, pudp, pud); | |
270 | pudp_set_wrprotect(mm, vaddr, pudp); | |
271 | pud = READ_ONCE(*pudp); | |
272 | WARN_ON(pud_write(pud)); | |
273 | ||
274 | #ifndef __PAGETABLE_PMD_FOLDED | |
275 | pud = pfn_pud(pfn, prot); | |
276 | set_pud_at(mm, vaddr, pudp, pud); | |
277 | pudp_huge_get_and_clear(mm, vaddr, pudp); | |
278 | pud = READ_ONCE(*pudp); | |
279 | WARN_ON(!pud_none(pud)); | |
280 | ||
281 | pud = pfn_pud(pfn, prot); | |
282 | set_pud_at(mm, vaddr, pudp, pud); | |
283 | pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1); | |
284 | pud = READ_ONCE(*pudp); | |
285 | WARN_ON(!pud_none(pud)); | |
286 | #endif /* __PAGETABLE_PMD_FOLDED */ | |
287 | pud = pfn_pud(pfn, prot); | |
288 | pud = pud_wrprotect(pud); | |
289 | pud = pud_mkclean(pud); | |
290 | set_pud_at(mm, vaddr, pudp, pud); | |
291 | pud = pud_mkwrite(pud); | |
292 | pud = pud_mkdirty(pud); | |
293 | pudp_set_access_flags(vma, vaddr, pudp, pud, 1); | |
294 | pud = READ_ONCE(*pudp); | |
295 | WARN_ON(!(pud_write(pud) && pud_dirty(pud))); | |
296 | ||
297 | pud = pud_mkyoung(pud); | |
298 | set_pud_at(mm, vaddr, pudp, pud); | |
299 | pudp_test_and_clear_young(vma, vaddr, pudp); | |
300 | pud = READ_ONCE(*pudp); | |
301 | WARN_ON(pud_young(pud)); | |
302 | } | |
303 | ||
304 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) | |
305 | { | |
306 | pud_t pud = pfn_pud(pfn, prot); | |
307 | ||
6315df41 | 308 | pr_debug("Validating PUD leaf\n"); |
a5c3b9ff AK |
309 | /* |
310 | * PUD based THP is a leaf entry. | |
311 | */ | |
312 | pud = pud_mkhuge(pud); | |
313 | WARN_ON(!pud_leaf(pud)); | |
314 | } | |
315 | ||
316 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) | |
317 | { | |
318 | pud_t pud; | |
319 | ||
320 | if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMAP)) | |
321 | return; | |
6315df41 AK |
322 | |
323 | pr_debug("Validating PUD huge\n"); | |
a5c3b9ff AK |
324 | /* |
325 | * X86 defined pud_set_huge() verifies that the given | |
326 | * PUD is not a populated non-leaf entry. | |
327 | */ | |
328 | WRITE_ONCE(*pudp, __pud(0)); | |
329 | WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot)); | |
330 | WARN_ON(!pud_clear_huge(pudp)); | |
331 | pud = READ_ONCE(*pudp); | |
332 | WARN_ON(!pud_none(pud)); | |
333 | } | |
399145f9 AK |
334 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
335 | static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) { } | |
a5c3b9ff AK |
336 | static void __init pud_advanced_tests(struct mm_struct *mm, |
337 | struct vm_area_struct *vma, pud_t *pudp, | |
338 | unsigned long pfn, unsigned long vaddr, | |
339 | pgprot_t prot) | |
340 | { | |
341 | } | |
342 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
343 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) | |
344 | { | |
345 | } | |
399145f9 AK |
346 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
347 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
348 | static void __init pmd_basic_tests(unsigned long pfn, pgprot_t prot) { } | |
349 | static void __init pud_basic_tests(unsigned long pfn, pgprot_t prot) { } | |
a5c3b9ff AK |
350 | static void __init pmd_advanced_tests(struct mm_struct *mm, |
351 | struct vm_area_struct *vma, pmd_t *pmdp, | |
352 | unsigned long pfn, unsigned long vaddr, | |
353 | pgprot_t prot) | |
354 | { | |
355 | } | |
356 | static void __init pud_advanced_tests(struct mm_struct *mm, | |
357 | struct vm_area_struct *vma, pud_t *pudp, | |
358 | unsigned long pfn, unsigned long vaddr, | |
359 | pgprot_t prot) | |
360 | { | |
361 | } | |
362 | static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
363 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
364 | static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) | |
365 | { | |
366 | } | |
367 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) | |
368 | { | |
369 | } | |
370 | static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { } | |
399145f9 AK |
371 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
372 | ||
373 | static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot) | |
374 | { | |
375 | p4d_t p4d; | |
376 | ||
6315df41 | 377 | pr_debug("Validating P4D basic\n"); |
399145f9 AK |
378 | memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t)); |
379 | WARN_ON(!p4d_same(p4d, p4d)); | |
380 | } | |
381 | ||
382 | static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot) | |
383 | { | |
384 | pgd_t pgd; | |
385 | ||
6315df41 | 386 | pr_debug("Validating PGD basic\n"); |
399145f9 AK |
387 | memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t)); |
388 | WARN_ON(!pgd_same(pgd, pgd)); | |
389 | } | |
390 | ||
391 | #ifndef __PAGETABLE_PUD_FOLDED | |
392 | static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) | |
393 | { | |
394 | pud_t pud = READ_ONCE(*pudp); | |
395 | ||
396 | if (mm_pmd_folded(mm)) | |
397 | return; | |
398 | ||
6315df41 | 399 | pr_debug("Validating PUD clear\n"); |
399145f9 AK |
400 | pud = __pud(pud_val(pud) | RANDOM_ORVALUE); |
401 | WRITE_ONCE(*pudp, pud); | |
402 | pud_clear(pudp); | |
403 | pud = READ_ONCE(*pudp); | |
404 | WARN_ON(!pud_none(pud)); | |
405 | } | |
406 | ||
407 | static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, | |
408 | pmd_t *pmdp) | |
409 | { | |
410 | pud_t pud; | |
411 | ||
412 | if (mm_pmd_folded(mm)) | |
413 | return; | |
6315df41 AK |
414 | |
415 | pr_debug("Validating PUD populate\n"); | |
399145f9 AK |
416 | /* |
417 | * This entry points to next level page table page. | |
418 | * Hence this must not qualify as pud_bad(). | |
419 | */ | |
420 | pmd_clear(pmdp); | |
421 | pud_clear(pudp); | |
422 | pud_populate(mm, pudp, pmdp); | |
423 | pud = READ_ONCE(*pudp); | |
424 | WARN_ON(pud_bad(pud)); | |
425 | } | |
426 | #else /* !__PAGETABLE_PUD_FOLDED */ | |
427 | static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) { } | |
428 | static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, | |
429 | pmd_t *pmdp) | |
430 | { | |
431 | } | |
432 | #endif /* PAGETABLE_PUD_FOLDED */ | |
433 | ||
434 | #ifndef __PAGETABLE_P4D_FOLDED | |
435 | static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) | |
436 | { | |
437 | p4d_t p4d = READ_ONCE(*p4dp); | |
438 | ||
439 | if (mm_pud_folded(mm)) | |
440 | return; | |
441 | ||
6315df41 | 442 | pr_debug("Validating P4D clear\n"); |
399145f9 AK |
443 | p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE); |
444 | WRITE_ONCE(*p4dp, p4d); | |
445 | p4d_clear(p4dp); | |
446 | p4d = READ_ONCE(*p4dp); | |
447 | WARN_ON(!p4d_none(p4d)); | |
448 | } | |
449 | ||
450 | static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, | |
451 | pud_t *pudp) | |
452 | { | |
453 | p4d_t p4d; | |
454 | ||
455 | if (mm_pud_folded(mm)) | |
456 | return; | |
457 | ||
6315df41 | 458 | pr_debug("Validating P4D populate\n"); |
399145f9 AK |
459 | /* |
460 | * This entry points to next level page table page. | |
461 | * Hence this must not qualify as p4d_bad(). | |
462 | */ | |
463 | pud_clear(pudp); | |
464 | p4d_clear(p4dp); | |
465 | p4d_populate(mm, p4dp, pudp); | |
466 | p4d = READ_ONCE(*p4dp); | |
467 | WARN_ON(p4d_bad(p4d)); | |
468 | } | |
469 | ||
470 | static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) | |
471 | { | |
472 | pgd_t pgd = READ_ONCE(*pgdp); | |
473 | ||
474 | if (mm_p4d_folded(mm)) | |
475 | return; | |
476 | ||
6315df41 | 477 | pr_debug("Validating PGD clear\n"); |
399145f9 AK |
478 | pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE); |
479 | WRITE_ONCE(*pgdp, pgd); | |
480 | pgd_clear(pgdp); | |
481 | pgd = READ_ONCE(*pgdp); | |
482 | WARN_ON(!pgd_none(pgd)); | |
483 | } | |
484 | ||
485 | static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, | |
486 | p4d_t *p4dp) | |
487 | { | |
488 | pgd_t pgd; | |
489 | ||
490 | if (mm_p4d_folded(mm)) | |
491 | return; | |
492 | ||
6315df41 | 493 | pr_debug("Validating PGD populate\n"); |
399145f9 AK |
494 | /* |
495 | * This entry points to next level page table page. | |
496 | * Hence this must not qualify as pgd_bad(). | |
497 | */ | |
498 | p4d_clear(p4dp); | |
499 | pgd_clear(pgdp); | |
500 | pgd_populate(mm, pgdp, p4dp); | |
501 | pgd = READ_ONCE(*pgdp); | |
502 | WARN_ON(pgd_bad(pgd)); | |
503 | } | |
504 | #else /* !__PAGETABLE_P4D_FOLDED */ | |
505 | static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { } | |
506 | static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { } | |
507 | static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, | |
508 | pud_t *pudp) | |
509 | { | |
510 | } | |
511 | static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, | |
512 | p4d_t *p4dp) | |
513 | { | |
514 | } | |
515 | #endif /* PAGETABLE_P4D_FOLDED */ | |
516 | ||
517 | static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, | |
518 | unsigned long vaddr) | |
519 | { | |
9449c9cb | 520 | pte_t pte = ptep_get(ptep); |
399145f9 | 521 | |
6315df41 | 522 | pr_debug("Validating PTE clear\n"); |
399145f9 AK |
523 | pte = __pte(pte_val(pte) | RANDOM_ORVALUE); |
524 | set_pte_at(mm, vaddr, ptep, pte); | |
525 | barrier(); | |
526 | pte_clear(mm, vaddr, ptep); | |
9449c9cb | 527 | pte = ptep_get(ptep); |
399145f9 AK |
528 | WARN_ON(!pte_none(pte)); |
529 | } | |
530 | ||
531 | static void __init pmd_clear_tests(struct mm_struct *mm, pmd_t *pmdp) | |
532 | { | |
533 | pmd_t pmd = READ_ONCE(*pmdp); | |
534 | ||
6315df41 | 535 | pr_debug("Validating PMD clear\n"); |
399145f9 AK |
536 | pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE); |
537 | WRITE_ONCE(*pmdp, pmd); | |
538 | pmd_clear(pmdp); | |
539 | pmd = READ_ONCE(*pmdp); | |
540 | WARN_ON(!pmd_none(pmd)); | |
541 | } | |
542 | ||
543 | static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp, | |
544 | pgtable_t pgtable) | |
545 | { | |
546 | pmd_t pmd; | |
547 | ||
6315df41 | 548 | pr_debug("Validating PMD populate\n"); |
399145f9 AK |
549 | /* |
550 | * This entry points to next level page table page. | |
551 | * Hence this must not qualify as pmd_bad(). | |
552 | */ | |
553 | pmd_clear(pmdp); | |
554 | pmd_populate(mm, pmdp, pgtable); | |
555 | pmd = READ_ONCE(*pmdp); | |
556 | WARN_ON(pmd_bad(pmd)); | |
557 | } | |
558 | ||
05289402 AK |
559 | static void __init pte_special_tests(unsigned long pfn, pgprot_t prot) |
560 | { | |
561 | pte_t pte = pfn_pte(pfn, prot); | |
562 | ||
563 | if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL)) | |
564 | return; | |
565 | ||
6315df41 | 566 | pr_debug("Validating PTE special\n"); |
05289402 AK |
567 | WARN_ON(!pte_special(pte_mkspecial(pte))); |
568 | } | |
569 | ||
570 | static void __init pte_protnone_tests(unsigned long pfn, pgprot_t prot) | |
571 | { | |
572 | pte_t pte = pfn_pte(pfn, prot); | |
573 | ||
574 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) | |
575 | return; | |
576 | ||
6315df41 | 577 | pr_debug("Validating PTE protnone\n"); |
05289402 AK |
578 | WARN_ON(!pte_protnone(pte)); |
579 | WARN_ON(!pte_present(pte)); | |
580 | } | |
581 | ||
582 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
583 | static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) | |
584 | { | |
585 | pmd_t pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); | |
586 | ||
587 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) | |
588 | return; | |
589 | ||
6315df41 | 590 | pr_debug("Validating PMD protnone\n"); |
05289402 AK |
591 | WARN_ON(!pmd_protnone(pmd)); |
592 | WARN_ON(!pmd_present(pmd)); | |
593 | } | |
594 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
595 | static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) { } | |
596 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
597 | ||
598 | #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP | |
599 | static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) | |
600 | { | |
601 | pte_t pte = pfn_pte(pfn, prot); | |
602 | ||
6315df41 | 603 | pr_debug("Validating PTE devmap\n"); |
05289402 AK |
604 | WARN_ON(!pte_devmap(pte_mkdevmap(pte))); |
605 | } | |
606 | ||
607 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
608 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) | |
609 | { | |
610 | pmd_t pmd = pfn_pmd(pfn, prot); | |
611 | ||
6315df41 | 612 | pr_debug("Validating PMD devmap\n"); |
05289402 AK |
613 | WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd))); |
614 | } | |
615 | ||
616 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
617 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) | |
618 | { | |
619 | pud_t pud = pfn_pud(pfn, prot); | |
620 | ||
6315df41 | 621 | pr_debug("Validating PUD devmap\n"); |
05289402 AK |
622 | WARN_ON(!pud_devmap(pud_mkdevmap(pud))); |
623 | } | |
624 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
625 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
626 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
627 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
628 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
629 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
630 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
631 | #else | |
632 | static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
633 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
634 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
635 | #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ | |
636 | ||
637 | static void __init pte_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
638 | { | |
639 | pte_t pte = pfn_pte(pfn, prot); | |
640 | ||
641 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
642 | return; | |
643 | ||
6315df41 | 644 | pr_debug("Validating PTE soft dirty\n"); |
05289402 AK |
645 | WARN_ON(!pte_soft_dirty(pte_mksoft_dirty(pte))); |
646 | WARN_ON(pte_soft_dirty(pte_clear_soft_dirty(pte))); | |
647 | } | |
648 | ||
649 | static void __init pte_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
650 | { | |
651 | pte_t pte = pfn_pte(pfn, prot); | |
652 | ||
653 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
654 | return; | |
655 | ||
6315df41 | 656 | pr_debug("Validating PTE swap soft dirty\n"); |
05289402 AK |
657 | WARN_ON(!pte_swp_soft_dirty(pte_swp_mksoft_dirty(pte))); |
658 | WARN_ON(pte_swp_soft_dirty(pte_swp_clear_soft_dirty(pte))); | |
659 | } | |
660 | ||
661 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
662 | static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
663 | { | |
664 | pmd_t pmd = pfn_pmd(pfn, prot); | |
665 | ||
666 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
667 | return; | |
668 | ||
6315df41 | 669 | pr_debug("Validating PMD soft dirty\n"); |
05289402 AK |
670 | WARN_ON(!pmd_soft_dirty(pmd_mksoft_dirty(pmd))); |
671 | WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd))); | |
672 | } | |
673 | ||
674 | static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
675 | { | |
676 | pmd_t pmd = pfn_pmd(pfn, prot); | |
677 | ||
678 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) || | |
679 | !IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION)) | |
680 | return; | |
681 | ||
6315df41 | 682 | pr_debug("Validating PMD swap soft dirty\n"); |
05289402 AK |
683 | WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd))); |
684 | WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd))); | |
685 | } | |
686 | #else /* !CONFIG_ARCH_HAS_PTE_DEVMAP */ | |
687 | static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) { } | |
688 | static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
689 | { | |
690 | } | |
691 | #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ | |
692 | ||
693 | static void __init pte_swap_tests(unsigned long pfn, pgprot_t prot) | |
694 | { | |
695 | swp_entry_t swp; | |
696 | pte_t pte; | |
697 | ||
6315df41 | 698 | pr_debug("Validating PTE swap\n"); |
05289402 AK |
699 | pte = pfn_pte(pfn, prot); |
700 | swp = __pte_to_swp_entry(pte); | |
701 | pte = __swp_entry_to_pte(swp); | |
702 | WARN_ON(pfn != pte_pfn(pte)); | |
703 | } | |
704 | ||
705 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
706 | static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) | |
707 | { | |
708 | swp_entry_t swp; | |
709 | pmd_t pmd; | |
710 | ||
6315df41 | 711 | pr_debug("Validating PMD swap\n"); |
05289402 AK |
712 | pmd = pfn_pmd(pfn, prot); |
713 | swp = __pmd_to_swp_entry(pmd); | |
714 | pmd = __swp_entry_to_pmd(swp); | |
715 | WARN_ON(pfn != pmd_pfn(pmd)); | |
716 | } | |
717 | #else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */ | |
718 | static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { } | |
719 | #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ | |
720 | ||
721 | static void __init swap_migration_tests(void) | |
722 | { | |
723 | struct page *page; | |
724 | swp_entry_t swp; | |
725 | ||
726 | if (!IS_ENABLED(CONFIG_MIGRATION)) | |
727 | return; | |
6315df41 AK |
728 | |
729 | pr_debug("Validating swap migration\n"); | |
05289402 AK |
730 | /* |
731 | * swap_migration_tests() requires a dedicated page as it needs to | |
732 | * be locked before creating a migration entry from it. Locking the | |
733 | * page that actually maps kernel text ('start_kernel') can be real | |
734 | * problematic. Lets allocate a dedicated page explicitly for this | |
735 | * purpose that will be freed subsequently. | |
736 | */ | |
737 | page = alloc_page(GFP_KERNEL); | |
738 | if (!page) { | |
739 | pr_err("page allocation failed\n"); | |
740 | return; | |
741 | } | |
742 | ||
743 | /* | |
744 | * make_migration_entry() expects given page to be | |
745 | * locked, otherwise it stumbles upon a BUG_ON(). | |
746 | */ | |
747 | __SetPageLocked(page); | |
748 | swp = make_migration_entry(page, 1); | |
749 | WARN_ON(!is_migration_entry(swp)); | |
750 | WARN_ON(!is_write_migration_entry(swp)); | |
751 | ||
752 | make_migration_entry_read(&swp); | |
753 | WARN_ON(!is_migration_entry(swp)); | |
754 | WARN_ON(is_write_migration_entry(swp)); | |
755 | ||
756 | swp = make_migration_entry(page, 0); | |
757 | WARN_ON(!is_migration_entry(swp)); | |
758 | WARN_ON(is_write_migration_entry(swp)); | |
759 | __ClearPageLocked(page); | |
760 | __free_page(page); | |
761 | } | |
762 | ||
763 | #ifdef CONFIG_HUGETLB_PAGE | |
764 | static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) | |
765 | { | |
766 | struct page *page; | |
767 | pte_t pte; | |
768 | ||
6315df41 | 769 | pr_debug("Validating HugeTLB basic\n"); |
05289402 AK |
770 | /* |
771 | * Accessing the page associated with the pfn is safe here, | |
772 | * as it was previously derived from a real kernel symbol. | |
773 | */ | |
774 | page = pfn_to_page(pfn); | |
775 | pte = mk_huge_pte(page, prot); | |
776 | ||
777 | WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte))); | |
778 | WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte)))); | |
779 | WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte)))); | |
780 | ||
781 | #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB | |
782 | pte = pfn_pte(pfn, prot); | |
783 | ||
784 | WARN_ON(!pte_huge(pte_mkhuge(pte))); | |
785 | #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ | |
786 | } | |
a5c3b9ff AK |
787 | |
788 | static void __init hugetlb_advanced_tests(struct mm_struct *mm, | |
789 | struct vm_area_struct *vma, | |
790 | pte_t *ptep, unsigned long pfn, | |
791 | unsigned long vaddr, pgprot_t prot) | |
792 | { | |
793 | struct page *page = pfn_to_page(pfn); | |
794 | pte_t pte = ptep_get(ptep); | |
795 | unsigned long paddr = __pfn_to_phys(pfn) & PMD_MASK; | |
796 | ||
6315df41 | 797 | pr_debug("Validating HugeTLB advanced\n"); |
a5c3b9ff AK |
798 | pte = pte_mkhuge(mk_pte(pfn_to_page(PHYS_PFN(paddr)), prot)); |
799 | set_huge_pte_at(mm, vaddr, ptep, pte); | |
800 | barrier(); | |
801 | WARN_ON(!pte_same(pte, huge_ptep_get(ptep))); | |
802 | huge_pte_clear(mm, vaddr, ptep, PMD_SIZE); | |
803 | pte = huge_ptep_get(ptep); | |
804 | WARN_ON(!huge_pte_none(pte)); | |
805 | ||
806 | pte = mk_huge_pte(page, prot); | |
807 | set_huge_pte_at(mm, vaddr, ptep, pte); | |
808 | barrier(); | |
809 | huge_ptep_set_wrprotect(mm, vaddr, ptep); | |
810 | pte = huge_ptep_get(ptep); | |
811 | WARN_ON(huge_pte_write(pte)); | |
812 | ||
813 | pte = mk_huge_pte(page, prot); | |
814 | set_huge_pte_at(mm, vaddr, ptep, pte); | |
815 | barrier(); | |
816 | huge_ptep_get_and_clear(mm, vaddr, ptep); | |
817 | pte = huge_ptep_get(ptep); | |
818 | WARN_ON(!huge_pte_none(pte)); | |
819 | ||
820 | pte = mk_huge_pte(page, prot); | |
821 | pte = huge_pte_wrprotect(pte); | |
822 | set_huge_pte_at(mm, vaddr, ptep, pte); | |
823 | barrier(); | |
824 | pte = huge_pte_mkwrite(pte); | |
825 | pte = huge_pte_mkdirty(pte); | |
826 | huge_ptep_set_access_flags(vma, vaddr, ptep, pte, 1); | |
827 | pte = huge_ptep_get(ptep); | |
828 | WARN_ON(!(huge_pte_write(pte) && huge_pte_dirty(pte))); | |
829 | } | |
05289402 AK |
830 | #else /* !CONFIG_HUGETLB_PAGE */ |
831 | static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { } | |
a5c3b9ff AK |
832 | static void __init hugetlb_advanced_tests(struct mm_struct *mm, |
833 | struct vm_area_struct *vma, | |
834 | pte_t *ptep, unsigned long pfn, | |
835 | unsigned long vaddr, pgprot_t prot) | |
836 | { | |
837 | } | |
05289402 AK |
838 | #endif /* CONFIG_HUGETLB_PAGE */ |
839 | ||
840 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
841 | static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) | |
842 | { | |
843 | pmd_t pmd; | |
844 | ||
845 | if (!has_transparent_hugepage()) | |
846 | return; | |
847 | ||
6315df41 | 848 | pr_debug("Validating PMD based THP\n"); |
05289402 AK |
849 | /* |
850 | * pmd_trans_huge() and pmd_present() must return positive after | |
851 | * MMU invalidation with pmd_mkinvalid(). This behavior is an | |
852 | * optimization for transparent huge page. pmd_trans_huge() must | |
853 | * be true if pmd_page() returns a valid THP to avoid taking the | |
854 | * pmd_lock when others walk over non transhuge pmds (i.e. there | |
855 | * are no THP allocated). Especially when splitting a THP and | |
856 | * removing the present bit from the pmd, pmd_trans_huge() still | |
857 | * needs to return true. pmd_present() should be true whenever | |
858 | * pmd_trans_huge() returns true. | |
859 | */ | |
860 | pmd = pfn_pmd(pfn, prot); | |
861 | WARN_ON(!pmd_trans_huge(pmd_mkhuge(pmd))); | |
862 | ||
863 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE | |
864 | WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd)))); | |
865 | WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd)))); | |
866 | #endif /* __HAVE_ARCH_PMDP_INVALIDATE */ | |
867 | } | |
868 | ||
869 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
870 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) | |
871 | { | |
872 | pud_t pud; | |
873 | ||
874 | if (!has_transparent_hugepage()) | |
875 | return; | |
876 | ||
6315df41 | 877 | pr_debug("Validating PUD based THP\n"); |
05289402 AK |
878 | pud = pfn_pud(pfn, prot); |
879 | WARN_ON(!pud_trans_huge(pud_mkhuge(pud))); | |
880 | ||
881 | /* | |
882 | * pud_mkinvalid() has been dropped for now. Enable back | |
883 | * these tests when it comes back with a modified pud_present(). | |
884 | * | |
885 | * WARN_ON(!pud_trans_huge(pud_mkinvalid(pud_mkhuge(pud)))); | |
886 | * WARN_ON(!pud_present(pud_mkinvalid(pud_mkhuge(pud)))); | |
887 | */ | |
888 | } | |
889 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
890 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
891 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
892 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
893 | static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
894 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
895 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
896 | ||
399145f9 AK |
897 | static unsigned long __init get_random_vaddr(void) |
898 | { | |
899 | unsigned long random_vaddr, random_pages, total_user_pages; | |
900 | ||
901 | total_user_pages = (TASK_SIZE - FIRST_USER_ADDRESS) / PAGE_SIZE; | |
902 | ||
903 | random_pages = get_random_long() % total_user_pages; | |
904 | random_vaddr = FIRST_USER_ADDRESS + random_pages * PAGE_SIZE; | |
905 | ||
906 | return random_vaddr; | |
907 | } | |
908 | ||
909 | static int __init debug_vm_pgtable(void) | |
910 | { | |
a5c3b9ff | 911 | struct vm_area_struct *vma; |
399145f9 AK |
912 | struct mm_struct *mm; |
913 | pgd_t *pgdp; | |
914 | p4d_t *p4dp, *saved_p4dp; | |
915 | pud_t *pudp, *saved_pudp; | |
916 | pmd_t *pmdp, *saved_pmdp, pmd; | |
917 | pte_t *ptep; | |
918 | pgtable_t saved_ptep; | |
05289402 | 919 | pgprot_t prot, protnone; |
399145f9 AK |
920 | phys_addr_t paddr; |
921 | unsigned long vaddr, pte_aligned, pmd_aligned; | |
922 | unsigned long pud_aligned, p4d_aligned, pgd_aligned; | |
fea1120c | 923 | spinlock_t *ptl = NULL; |
399145f9 AK |
924 | |
925 | pr_info("Validating architecture page table helpers\n"); | |
926 | prot = vm_get_page_prot(VMFLAGS); | |
927 | vaddr = get_random_vaddr(); | |
928 | mm = mm_alloc(); | |
929 | if (!mm) { | |
930 | pr_err("mm_struct allocation failed\n"); | |
931 | return 1; | |
932 | } | |
933 | ||
05289402 AK |
934 | /* |
935 | * __P000 (or even __S000) will help create page table entries with | |
936 | * PROT_NONE permission as required for pxx_protnone_tests(). | |
937 | */ | |
938 | protnone = __P000; | |
939 | ||
a5c3b9ff AK |
940 | vma = vm_area_alloc(mm); |
941 | if (!vma) { | |
942 | pr_err("vma allocation failed\n"); | |
943 | return 1; | |
944 | } | |
945 | ||
399145f9 AK |
946 | /* |
947 | * PFN for mapping at PTE level is determined from a standard kernel | |
948 | * text symbol. But pfns for higher page table levels are derived by | |
949 | * masking lower bits of this real pfn. These derived pfns might not | |
950 | * exist on the platform but that does not really matter as pfn_pxx() | |
951 | * helpers will still create appropriate entries for the test. This | |
952 | * helps avoid large memory block allocations to be used for mapping | |
953 | * at higher page table levels. | |
954 | */ | |
955 | paddr = __pa_symbol(&start_kernel); | |
956 | ||
957 | pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT; | |
958 | pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT; | |
959 | pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT; | |
960 | p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT; | |
961 | pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT; | |
962 | WARN_ON(!pfn_valid(pte_aligned)); | |
963 | ||
964 | pgdp = pgd_offset(mm, vaddr); | |
965 | p4dp = p4d_alloc(mm, pgdp, vaddr); | |
966 | pudp = pud_alloc(mm, p4dp, vaddr); | |
967 | pmdp = pmd_alloc(mm, pudp, vaddr); | |
968 | ptep = pte_alloc_map_lock(mm, pmdp, vaddr, &ptl); | |
969 | ||
970 | /* | |
971 | * Save all the page table page addresses as the page table | |
972 | * entries will be used for testing with random or garbage | |
973 | * values. These saved addresses will be used for freeing | |
974 | * page table pages. | |
975 | */ | |
976 | pmd = READ_ONCE(*pmdp); | |
977 | saved_p4dp = p4d_offset(pgdp, 0UL); | |
978 | saved_pudp = pud_offset(p4dp, 0UL); | |
979 | saved_pmdp = pmd_offset(pudp, 0UL); | |
980 | saved_ptep = pmd_pgtable(pmd); | |
981 | ||
982 | pte_basic_tests(pte_aligned, prot); | |
983 | pmd_basic_tests(pmd_aligned, prot); | |
984 | pud_basic_tests(pud_aligned, prot); | |
985 | p4d_basic_tests(p4d_aligned, prot); | |
986 | pgd_basic_tests(pgd_aligned, prot); | |
987 | ||
988 | pte_clear_tests(mm, ptep, vaddr); | |
989 | pmd_clear_tests(mm, pmdp); | |
990 | pud_clear_tests(mm, pudp); | |
991 | p4d_clear_tests(mm, p4dp); | |
992 | pgd_clear_tests(mm, pgdp); | |
993 | ||
a5c3b9ff AK |
994 | pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); |
995 | pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot); | |
996 | pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot); | |
997 | hugetlb_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); | |
998 | ||
999 | pmd_leaf_tests(pmd_aligned, prot); | |
1000 | pud_leaf_tests(pud_aligned, prot); | |
1001 | ||
1002 | pmd_huge_tests(pmdp, pmd_aligned, prot); | |
1003 | pud_huge_tests(pudp, pud_aligned, prot); | |
1004 | ||
1005 | pte_savedwrite_tests(pte_aligned, prot); | |
1006 | pmd_savedwrite_tests(pmd_aligned, prot); | |
1007 | ||
399145f9 AK |
1008 | pte_unmap_unlock(ptep, ptl); |
1009 | ||
1010 | pmd_populate_tests(mm, pmdp, saved_ptep); | |
1011 | pud_populate_tests(mm, pudp, saved_pmdp); | |
1012 | p4d_populate_tests(mm, p4dp, saved_pudp); | |
1013 | pgd_populate_tests(mm, pgdp, saved_p4dp); | |
1014 | ||
05289402 AK |
1015 | pte_special_tests(pte_aligned, prot); |
1016 | pte_protnone_tests(pte_aligned, protnone); | |
1017 | pmd_protnone_tests(pmd_aligned, protnone); | |
1018 | ||
1019 | pte_devmap_tests(pte_aligned, prot); | |
1020 | pmd_devmap_tests(pmd_aligned, prot); | |
1021 | pud_devmap_tests(pud_aligned, prot); | |
1022 | ||
1023 | pte_soft_dirty_tests(pte_aligned, prot); | |
1024 | pmd_soft_dirty_tests(pmd_aligned, prot); | |
1025 | pte_swap_soft_dirty_tests(pte_aligned, prot); | |
1026 | pmd_swap_soft_dirty_tests(pmd_aligned, prot); | |
1027 | ||
1028 | pte_swap_tests(pte_aligned, prot); | |
1029 | pmd_swap_tests(pmd_aligned, prot); | |
1030 | ||
1031 | swap_migration_tests(); | |
1032 | hugetlb_basic_tests(pte_aligned, prot); | |
1033 | ||
1034 | pmd_thp_tests(pmd_aligned, prot); | |
1035 | pud_thp_tests(pud_aligned, prot); | |
1036 | ||
399145f9 AK |
1037 | p4d_free(mm, saved_p4dp); |
1038 | pud_free(mm, saved_pudp); | |
1039 | pmd_free(mm, saved_pmdp); | |
1040 | pte_free(mm, saved_ptep); | |
1041 | ||
a5c3b9ff | 1042 | vm_area_free(vma); |
399145f9 AK |
1043 | mm_dec_nr_puds(mm); |
1044 | mm_dec_nr_pmds(mm); | |
1045 | mm_dec_nr_ptes(mm); | |
1046 | mmdrop(mm); | |
1047 | return 0; | |
1048 | } | |
1049 | late_initcall(debug_vm_pgtable); |