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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 | ||
2e326c07 | 61 | static void __init pte_basic_tests(unsigned long pfn, int idx) |
399145f9 | 62 | { |
2e326c07 | 63 | pgprot_t prot = protection_map[idx]; |
399145f9 | 64 | pte_t pte = pfn_pte(pfn, prot); |
2e326c07 | 65 | unsigned long val = idx, *ptr = &val; |
399145f9 | 66 | |
2e326c07 | 67 | pr_debug("Validating PTE basic (%pGv)\n", ptr); |
bb5c47ce AK |
68 | |
69 | /* | |
70 | * This test needs to be executed after the given page table entry | |
71 | * is created with pfn_pte() to make sure that protection_map[idx] | |
72 | * does not have the dirty bit enabled from the beginning. This is | |
73 | * important for platforms like arm64 where (!PTE_RDONLY) indicate | |
74 | * dirty bit being set. | |
75 | */ | |
76 | WARN_ON(pte_dirty(pte_wrprotect(pte))); | |
77 | ||
399145f9 AK |
78 | WARN_ON(!pte_same(pte, pte)); |
79 | WARN_ON(!pte_young(pte_mkyoung(pte_mkold(pte)))); | |
80 | WARN_ON(!pte_dirty(pte_mkdirty(pte_mkclean(pte)))); | |
81 | WARN_ON(!pte_write(pte_mkwrite(pte_wrprotect(pte)))); | |
82 | WARN_ON(pte_young(pte_mkold(pte_mkyoung(pte)))); | |
83 | WARN_ON(pte_dirty(pte_mkclean(pte_mkdirty(pte)))); | |
84 | WARN_ON(pte_write(pte_wrprotect(pte_mkwrite(pte)))); | |
bb5c47ce AK |
85 | WARN_ON(pte_dirty(pte_wrprotect(pte_mkclean(pte)))); |
86 | WARN_ON(!pte_dirty(pte_wrprotect(pte_mkdirty(pte)))); | |
399145f9 AK |
87 | } |
88 | ||
a5c3b9ff AK |
89 | static void __init pte_advanced_tests(struct mm_struct *mm, |
90 | struct vm_area_struct *vma, pte_t *ptep, | |
91 | unsigned long pfn, unsigned long vaddr, | |
92 | pgprot_t prot) | |
93 | { | |
b593b90d | 94 | pte_t pte; |
a5c3b9ff | 95 | |
c3824e18 AK |
96 | /* |
97 | * Architectures optimize set_pte_at by avoiding TLB flush. | |
98 | * This requires set_pte_at to be not used to update an | |
99 | * existing pte entry. Clear pte before we do set_pte_at | |
100 | */ | |
101 | ||
6315df41 | 102 | pr_debug("Validating PTE advanced\n"); |
a5c3b9ff AK |
103 | pte = pfn_pte(pfn, prot); |
104 | set_pte_at(mm, vaddr, ptep, pte); | |
105 | ptep_set_wrprotect(mm, vaddr, ptep); | |
106 | pte = ptep_get(ptep); | |
107 | WARN_ON(pte_write(pte)); | |
a5c3b9ff AK |
108 | ptep_get_and_clear(mm, vaddr, ptep); |
109 | pte = ptep_get(ptep); | |
110 | WARN_ON(!pte_none(pte)); | |
111 | ||
112 | pte = pfn_pte(pfn, prot); | |
113 | pte = pte_wrprotect(pte); | |
114 | pte = pte_mkclean(pte); | |
115 | set_pte_at(mm, vaddr, ptep, pte); | |
116 | pte = pte_mkwrite(pte); | |
117 | pte = pte_mkdirty(pte); | |
118 | ptep_set_access_flags(vma, vaddr, ptep, pte, 1); | |
119 | pte = ptep_get(ptep); | |
120 | WARN_ON(!(pte_write(pte) && pte_dirty(pte))); | |
a5c3b9ff AK |
121 | ptep_get_and_clear_full(mm, vaddr, ptep, 1); |
122 | pte = ptep_get(ptep); | |
123 | WARN_ON(!pte_none(pte)); | |
124 | ||
c3824e18 | 125 | pte = pfn_pte(pfn, prot); |
a5c3b9ff AK |
126 | pte = pte_mkyoung(pte); |
127 | set_pte_at(mm, vaddr, ptep, pte); | |
128 | ptep_test_and_clear_young(vma, vaddr, ptep); | |
129 | pte = ptep_get(ptep); | |
130 | WARN_ON(pte_young(pte)); | |
131 | } | |
132 | ||
133 | static void __init pte_savedwrite_tests(unsigned long pfn, pgprot_t prot) | |
134 | { | |
135 | pte_t pte = pfn_pte(pfn, prot); | |
136 | ||
4200605b AK |
137 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) |
138 | return; | |
139 | ||
6315df41 | 140 | pr_debug("Validating PTE saved write\n"); |
a5c3b9ff AK |
141 | WARN_ON(!pte_savedwrite(pte_mk_savedwrite(pte_clear_savedwrite(pte)))); |
142 | WARN_ON(pte_savedwrite(pte_clear_savedwrite(pte_mk_savedwrite(pte)))); | |
143 | } | |
4200605b | 144 | |
399145f9 | 145 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
2e326c07 | 146 | static void __init pmd_basic_tests(unsigned long pfn, int idx) |
399145f9 | 147 | { |
2e326c07 | 148 | pgprot_t prot = protection_map[idx]; |
2e326c07 | 149 | unsigned long val = idx, *ptr = &val; |
65ac1a60 | 150 | pmd_t pmd; |
399145f9 | 151 | |
787d563b AK |
152 | if (!has_transparent_hugepage()) |
153 | return; | |
154 | ||
2e326c07 | 155 | pr_debug("Validating PMD basic (%pGv)\n", ptr); |
65ac1a60 | 156 | pmd = pfn_pmd(pfn, prot); |
bb5c47ce AK |
157 | |
158 | /* | |
159 | * This test needs to be executed after the given page table entry | |
160 | * is created with pfn_pmd() to make sure that protection_map[idx] | |
161 | * does not have the dirty bit enabled from the beginning. This is | |
162 | * important for platforms like arm64 where (!PTE_RDONLY) indicate | |
163 | * dirty bit being set. | |
164 | */ | |
165 | WARN_ON(pmd_dirty(pmd_wrprotect(pmd))); | |
166 | ||
167 | ||
399145f9 AK |
168 | WARN_ON(!pmd_same(pmd, pmd)); |
169 | WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd)))); | |
170 | WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd)))); | |
171 | WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd)))); | |
172 | WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd)))); | |
173 | WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd)))); | |
174 | WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd)))); | |
bb5c47ce AK |
175 | WARN_ON(pmd_dirty(pmd_wrprotect(pmd_mkclean(pmd)))); |
176 | WARN_ON(!pmd_dirty(pmd_wrprotect(pmd_mkdirty(pmd)))); | |
399145f9 AK |
177 | /* |
178 | * A huge page does not point to next level page table | |
179 | * entry. Hence this must qualify as pmd_bad(). | |
180 | */ | |
181 | WARN_ON(!pmd_bad(pmd_mkhuge(pmd))); | |
182 | } | |
183 | ||
a5c3b9ff AK |
184 | static void __init pmd_advanced_tests(struct mm_struct *mm, |
185 | struct vm_area_struct *vma, pmd_t *pmdp, | |
186 | unsigned long pfn, unsigned long vaddr, | |
87f34986 | 187 | pgprot_t prot, pgtable_t pgtable) |
a5c3b9ff | 188 | { |
65ac1a60 | 189 | pmd_t pmd; |
a5c3b9ff AK |
190 | |
191 | if (!has_transparent_hugepage()) | |
192 | return; | |
193 | ||
6315df41 | 194 | pr_debug("Validating PMD advanced\n"); |
a5c3b9ff | 195 | /* Align the address wrt HPAGE_PMD_SIZE */ |
04f7ce3f | 196 | vaddr &= HPAGE_PMD_MASK; |
a5c3b9ff | 197 | |
87f34986 AK |
198 | pgtable_trans_huge_deposit(mm, pmdp, pgtable); |
199 | ||
a5c3b9ff AK |
200 | pmd = pfn_pmd(pfn, prot); |
201 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
202 | pmdp_set_wrprotect(mm, vaddr, pmdp); | |
203 | pmd = READ_ONCE(*pmdp); | |
204 | WARN_ON(pmd_write(pmd)); | |
a5c3b9ff AK |
205 | pmdp_huge_get_and_clear(mm, vaddr, pmdp); |
206 | pmd = READ_ONCE(*pmdp); | |
207 | WARN_ON(!pmd_none(pmd)); | |
208 | ||
209 | pmd = pfn_pmd(pfn, prot); | |
210 | pmd = pmd_wrprotect(pmd); | |
211 | pmd = pmd_mkclean(pmd); | |
212 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
213 | pmd = pmd_mkwrite(pmd); | |
214 | pmd = pmd_mkdirty(pmd); | |
215 | pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1); | |
216 | pmd = READ_ONCE(*pmdp); | |
217 | WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); | |
a5c3b9ff AK |
218 | pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1); |
219 | pmd = READ_ONCE(*pmdp); | |
220 | WARN_ON(!pmd_none(pmd)); | |
221 | ||
c3824e18 | 222 | pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); |
a5c3b9ff AK |
223 | pmd = pmd_mkyoung(pmd); |
224 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
225 | pmdp_test_and_clear_young(vma, vaddr, pmdp); | |
226 | pmd = READ_ONCE(*pmdp); | |
227 | WARN_ON(pmd_young(pmd)); | |
87f34986 | 228 | |
13af0506 AK |
229 | /* Clear the pte entries */ |
230 | pmdp_huge_get_and_clear(mm, vaddr, pmdp); | |
87f34986 | 231 | pgtable = pgtable_trans_huge_withdraw(mm, pmdp); |
a5c3b9ff AK |
232 | } |
233 | ||
234 | static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) | |
235 | { | |
65ac1a60 AK |
236 | pmd_t pmd; |
237 | ||
238 | if (!has_transparent_hugepage()) | |
239 | return; | |
a5c3b9ff | 240 | |
6315df41 | 241 | pr_debug("Validating PMD leaf\n"); |
65ac1a60 AK |
242 | pmd = pfn_pmd(pfn, prot); |
243 | ||
a5c3b9ff AK |
244 | /* |
245 | * PMD based THP is a leaf entry. | |
246 | */ | |
247 | pmd = pmd_mkhuge(pmd); | |
248 | WARN_ON(!pmd_leaf(pmd)); | |
249 | } | |
250 | ||
a5c3b9ff AK |
251 | static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) |
252 | { | |
65ac1a60 | 253 | pmd_t pmd; |
a5c3b9ff | 254 | |
4200605b AK |
255 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) |
256 | return; | |
257 | ||
65ac1a60 AK |
258 | if (!has_transparent_hugepage()) |
259 | return; | |
260 | ||
6315df41 | 261 | pr_debug("Validating PMD saved write\n"); |
65ac1a60 | 262 | pmd = pfn_pmd(pfn, prot); |
a5c3b9ff AK |
263 | WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd)))); |
264 | WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd)))); | |
265 | } | |
266 | ||
399145f9 | 267 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
2e326c07 | 268 | static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) |
399145f9 | 269 | { |
2e326c07 | 270 | pgprot_t prot = protection_map[idx]; |
2e326c07 | 271 | unsigned long val = idx, *ptr = &val; |
65ac1a60 | 272 | pud_t pud; |
399145f9 | 273 | |
787d563b AK |
274 | if (!has_transparent_hugepage()) |
275 | return; | |
276 | ||
2e326c07 | 277 | pr_debug("Validating PUD basic (%pGv)\n", ptr); |
65ac1a60 | 278 | pud = pfn_pud(pfn, prot); |
bb5c47ce AK |
279 | |
280 | /* | |
281 | * This test needs to be executed after the given page table entry | |
282 | * is created with pfn_pud() to make sure that protection_map[idx] | |
283 | * does not have the dirty bit enabled from the beginning. This is | |
284 | * important for platforms like arm64 where (!PTE_RDONLY) indicate | |
285 | * dirty bit being set. | |
286 | */ | |
287 | WARN_ON(pud_dirty(pud_wrprotect(pud))); | |
288 | ||
399145f9 AK |
289 | WARN_ON(!pud_same(pud, pud)); |
290 | WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud)))); | |
bb5c47ce AK |
291 | WARN_ON(!pud_dirty(pud_mkdirty(pud_mkclean(pud)))); |
292 | WARN_ON(pud_dirty(pud_mkclean(pud_mkdirty(pud)))); | |
399145f9 AK |
293 | WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud)))); |
294 | WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud)))); | |
295 | WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud)))); | |
bb5c47ce AK |
296 | WARN_ON(pud_dirty(pud_wrprotect(pud_mkclean(pud)))); |
297 | WARN_ON(!pud_dirty(pud_wrprotect(pud_mkdirty(pud)))); | |
399145f9 AK |
298 | |
299 | if (mm_pmd_folded(mm)) | |
300 | return; | |
301 | ||
302 | /* | |
303 | * A huge page does not point to next level page table | |
304 | * entry. Hence this must qualify as pud_bad(). | |
305 | */ | |
306 | WARN_ON(!pud_bad(pud_mkhuge(pud))); | |
307 | } | |
a5c3b9ff AK |
308 | |
309 | static void __init pud_advanced_tests(struct mm_struct *mm, | |
310 | struct vm_area_struct *vma, pud_t *pudp, | |
311 | unsigned long pfn, unsigned long vaddr, | |
312 | pgprot_t prot) | |
313 | { | |
65ac1a60 | 314 | pud_t pud; |
a5c3b9ff AK |
315 | |
316 | if (!has_transparent_hugepage()) | |
317 | return; | |
318 | ||
6315df41 | 319 | pr_debug("Validating PUD advanced\n"); |
a5c3b9ff | 320 | /* Align the address wrt HPAGE_PUD_SIZE */ |
04f7ce3f | 321 | vaddr &= HPAGE_PUD_MASK; |
a5c3b9ff | 322 | |
65ac1a60 | 323 | pud = pfn_pud(pfn, prot); |
a5c3b9ff AK |
324 | set_pud_at(mm, vaddr, pudp, pud); |
325 | pudp_set_wrprotect(mm, vaddr, pudp); | |
326 | pud = READ_ONCE(*pudp); | |
327 | WARN_ON(pud_write(pud)); | |
328 | ||
329 | #ifndef __PAGETABLE_PMD_FOLDED | |
a5c3b9ff AK |
330 | pudp_huge_get_and_clear(mm, vaddr, pudp); |
331 | pud = READ_ONCE(*pudp); | |
332 | WARN_ON(!pud_none(pud)); | |
a5c3b9ff AK |
333 | #endif /* __PAGETABLE_PMD_FOLDED */ |
334 | pud = pfn_pud(pfn, prot); | |
335 | pud = pud_wrprotect(pud); | |
336 | pud = pud_mkclean(pud); | |
337 | set_pud_at(mm, vaddr, pudp, pud); | |
338 | pud = pud_mkwrite(pud); | |
339 | pud = pud_mkdirty(pud); | |
340 | pudp_set_access_flags(vma, vaddr, pudp, pud, 1); | |
341 | pud = READ_ONCE(*pudp); | |
342 | WARN_ON(!(pud_write(pud) && pud_dirty(pud))); | |
343 | ||
c3824e18 AK |
344 | #ifndef __PAGETABLE_PMD_FOLDED |
345 | pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1); | |
346 | pud = READ_ONCE(*pudp); | |
347 | WARN_ON(!pud_none(pud)); | |
348 | #endif /* __PAGETABLE_PMD_FOLDED */ | |
349 | ||
350 | pud = pfn_pud(pfn, prot); | |
a5c3b9ff AK |
351 | pud = pud_mkyoung(pud); |
352 | set_pud_at(mm, vaddr, pudp, pud); | |
353 | pudp_test_and_clear_young(vma, vaddr, pudp); | |
354 | pud = READ_ONCE(*pudp); | |
355 | WARN_ON(pud_young(pud)); | |
13af0506 AK |
356 | |
357 | pudp_huge_get_and_clear(mm, vaddr, pudp); | |
a5c3b9ff AK |
358 | } |
359 | ||
360 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) | |
361 | { | |
65ac1a60 AK |
362 | pud_t pud; |
363 | ||
364 | if (!has_transparent_hugepage()) | |
365 | return; | |
a5c3b9ff | 366 | |
6315df41 | 367 | pr_debug("Validating PUD leaf\n"); |
65ac1a60 | 368 | pud = pfn_pud(pfn, prot); |
a5c3b9ff AK |
369 | /* |
370 | * PUD based THP is a leaf entry. | |
371 | */ | |
372 | pud = pud_mkhuge(pud); | |
373 | WARN_ON(!pud_leaf(pud)); | |
374 | } | |
399145f9 | 375 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
2e326c07 | 376 | static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { } |
a5c3b9ff AK |
377 | static void __init pud_advanced_tests(struct mm_struct *mm, |
378 | struct vm_area_struct *vma, pud_t *pudp, | |
379 | unsigned long pfn, unsigned long vaddr, | |
380 | pgprot_t prot) | |
381 | { | |
382 | } | |
383 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
399145f9 AK |
384 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
385 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
2e326c07 AK |
386 | static void __init pmd_basic_tests(unsigned long pfn, int idx) { } |
387 | static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { } | |
a5c3b9ff AK |
388 | static void __init pmd_advanced_tests(struct mm_struct *mm, |
389 | struct vm_area_struct *vma, pmd_t *pmdp, | |
390 | unsigned long pfn, unsigned long vaddr, | |
87f34986 | 391 | pgprot_t prot, pgtable_t pgtable) |
a5c3b9ff AK |
392 | { |
393 | } | |
394 | static void __init pud_advanced_tests(struct mm_struct *mm, | |
395 | struct vm_area_struct *vma, pud_t *pudp, | |
396 | unsigned long pfn, unsigned long vaddr, | |
397 | pgprot_t prot) | |
398 | { | |
399 | } | |
400 | static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
401 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
5fe77be6 SL |
402 | static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { } |
403 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
404 | ||
405 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP | |
a5c3b9ff AK |
406 | static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) |
407 | { | |
5fe77be6 SL |
408 | pmd_t pmd; |
409 | ||
410 | if (!arch_vmap_pmd_supported(prot)) | |
411 | return; | |
412 | ||
413 | pr_debug("Validating PMD huge\n"); | |
414 | /* | |
415 | * X86 defined pmd_set_huge() verifies that the given | |
416 | * PMD is not a populated non-leaf entry. | |
417 | */ | |
418 | WRITE_ONCE(*pmdp, __pmd(0)); | |
419 | WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot)); | |
420 | WARN_ON(!pmd_clear_huge(pmdp)); | |
421 | pmd = READ_ONCE(*pmdp); | |
422 | WARN_ON(!pmd_none(pmd)); | |
a5c3b9ff | 423 | } |
5fe77be6 | 424 | |
a5c3b9ff AK |
425 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) |
426 | { | |
5fe77be6 SL |
427 | pud_t pud; |
428 | ||
429 | if (!arch_vmap_pud_supported(prot)) | |
430 | return; | |
431 | ||
432 | pr_debug("Validating PUD huge\n"); | |
433 | /* | |
434 | * X86 defined pud_set_huge() verifies that the given | |
435 | * PUD is not a populated non-leaf entry. | |
436 | */ | |
437 | WRITE_ONCE(*pudp, __pud(0)); | |
438 | WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot)); | |
439 | WARN_ON(!pud_clear_huge(pudp)); | |
440 | pud = READ_ONCE(*pudp); | |
441 | WARN_ON(!pud_none(pud)); | |
a5c3b9ff | 442 | } |
5fe77be6 SL |
443 | #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ |
444 | static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) { } | |
445 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { } | |
446 | #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ | |
399145f9 AK |
447 | |
448 | static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot) | |
449 | { | |
450 | p4d_t p4d; | |
451 | ||
6315df41 | 452 | pr_debug("Validating P4D basic\n"); |
399145f9 AK |
453 | memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t)); |
454 | WARN_ON(!p4d_same(p4d, p4d)); | |
455 | } | |
456 | ||
457 | static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot) | |
458 | { | |
459 | pgd_t pgd; | |
460 | ||
6315df41 | 461 | pr_debug("Validating PGD basic\n"); |
399145f9 AK |
462 | memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t)); |
463 | WARN_ON(!pgd_same(pgd, pgd)); | |
464 | } | |
465 | ||
466 | #ifndef __PAGETABLE_PUD_FOLDED | |
467 | static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) | |
468 | { | |
469 | pud_t pud = READ_ONCE(*pudp); | |
470 | ||
471 | if (mm_pmd_folded(mm)) | |
472 | return; | |
473 | ||
6315df41 | 474 | pr_debug("Validating PUD clear\n"); |
399145f9 AK |
475 | pud = __pud(pud_val(pud) | RANDOM_ORVALUE); |
476 | WRITE_ONCE(*pudp, pud); | |
477 | pud_clear(pudp); | |
478 | pud = READ_ONCE(*pudp); | |
479 | WARN_ON(!pud_none(pud)); | |
480 | } | |
481 | ||
482 | static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, | |
483 | pmd_t *pmdp) | |
484 | { | |
485 | pud_t pud; | |
486 | ||
487 | if (mm_pmd_folded(mm)) | |
488 | return; | |
6315df41 AK |
489 | |
490 | pr_debug("Validating PUD populate\n"); | |
399145f9 AK |
491 | /* |
492 | * This entry points to next level page table page. | |
493 | * Hence this must not qualify as pud_bad(). | |
494 | */ | |
399145f9 AK |
495 | pud_populate(mm, pudp, pmdp); |
496 | pud = READ_ONCE(*pudp); | |
497 | WARN_ON(pud_bad(pud)); | |
498 | } | |
499 | #else /* !__PAGETABLE_PUD_FOLDED */ | |
500 | static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) { } | |
501 | static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, | |
502 | pmd_t *pmdp) | |
503 | { | |
504 | } | |
505 | #endif /* PAGETABLE_PUD_FOLDED */ | |
506 | ||
507 | #ifndef __PAGETABLE_P4D_FOLDED | |
508 | static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) | |
509 | { | |
510 | p4d_t p4d = READ_ONCE(*p4dp); | |
511 | ||
512 | if (mm_pud_folded(mm)) | |
513 | return; | |
514 | ||
6315df41 | 515 | pr_debug("Validating P4D clear\n"); |
399145f9 AK |
516 | p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE); |
517 | WRITE_ONCE(*p4dp, p4d); | |
518 | p4d_clear(p4dp); | |
519 | p4d = READ_ONCE(*p4dp); | |
520 | WARN_ON(!p4d_none(p4d)); | |
521 | } | |
522 | ||
523 | static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, | |
524 | pud_t *pudp) | |
525 | { | |
526 | p4d_t p4d; | |
527 | ||
528 | if (mm_pud_folded(mm)) | |
529 | return; | |
530 | ||
6315df41 | 531 | pr_debug("Validating P4D populate\n"); |
399145f9 AK |
532 | /* |
533 | * This entry points to next level page table page. | |
534 | * Hence this must not qualify as p4d_bad(). | |
535 | */ | |
536 | pud_clear(pudp); | |
537 | p4d_clear(p4dp); | |
538 | p4d_populate(mm, p4dp, pudp); | |
539 | p4d = READ_ONCE(*p4dp); | |
540 | WARN_ON(p4d_bad(p4d)); | |
541 | } | |
542 | ||
543 | static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) | |
544 | { | |
545 | pgd_t pgd = READ_ONCE(*pgdp); | |
546 | ||
547 | if (mm_p4d_folded(mm)) | |
548 | return; | |
549 | ||
6315df41 | 550 | pr_debug("Validating PGD clear\n"); |
399145f9 AK |
551 | pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE); |
552 | WRITE_ONCE(*pgdp, pgd); | |
553 | pgd_clear(pgdp); | |
554 | pgd = READ_ONCE(*pgdp); | |
555 | WARN_ON(!pgd_none(pgd)); | |
556 | } | |
557 | ||
558 | static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, | |
559 | p4d_t *p4dp) | |
560 | { | |
561 | pgd_t pgd; | |
562 | ||
563 | if (mm_p4d_folded(mm)) | |
564 | return; | |
565 | ||
6315df41 | 566 | pr_debug("Validating PGD populate\n"); |
399145f9 AK |
567 | /* |
568 | * This entry points to next level page table page. | |
569 | * Hence this must not qualify as pgd_bad(). | |
570 | */ | |
571 | p4d_clear(p4dp); | |
572 | pgd_clear(pgdp); | |
573 | pgd_populate(mm, pgdp, p4dp); | |
574 | pgd = READ_ONCE(*pgdp); | |
575 | WARN_ON(pgd_bad(pgd)); | |
576 | } | |
577 | #else /* !__PAGETABLE_P4D_FOLDED */ | |
578 | static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { } | |
579 | static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { } | |
580 | static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, | |
581 | pud_t *pudp) | |
582 | { | |
583 | } | |
584 | static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, | |
585 | p4d_t *p4dp) | |
586 | { | |
587 | } | |
588 | #endif /* PAGETABLE_P4D_FOLDED */ | |
589 | ||
590 | static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, | |
401035d5 AK |
591 | unsigned long pfn, unsigned long vaddr, |
592 | pgprot_t prot) | |
399145f9 | 593 | { |
401035d5 | 594 | pte_t pte = pfn_pte(pfn, prot); |
399145f9 | 595 | |
6315df41 | 596 | pr_debug("Validating PTE clear\n"); |
401035d5 | 597 | #ifndef CONFIG_RISCV |
399145f9 | 598 | pte = __pte(pte_val(pte) | RANDOM_ORVALUE); |
401035d5 | 599 | #endif |
399145f9 AK |
600 | set_pte_at(mm, vaddr, ptep, pte); |
601 | barrier(); | |
602 | pte_clear(mm, vaddr, ptep); | |
9449c9cb | 603 | pte = ptep_get(ptep); |
399145f9 AK |
604 | WARN_ON(!pte_none(pte)); |
605 | } | |
606 | ||
607 | static void __init pmd_clear_tests(struct mm_struct *mm, pmd_t *pmdp) | |
608 | { | |
609 | pmd_t pmd = READ_ONCE(*pmdp); | |
610 | ||
6315df41 | 611 | pr_debug("Validating PMD clear\n"); |
399145f9 AK |
612 | pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE); |
613 | WRITE_ONCE(*pmdp, pmd); | |
614 | pmd_clear(pmdp); | |
615 | pmd = READ_ONCE(*pmdp); | |
616 | WARN_ON(!pmd_none(pmd)); | |
617 | } | |
618 | ||
619 | static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp, | |
620 | pgtable_t pgtable) | |
621 | { | |
622 | pmd_t pmd; | |
623 | ||
6315df41 | 624 | pr_debug("Validating PMD populate\n"); |
399145f9 AK |
625 | /* |
626 | * This entry points to next level page table page. | |
627 | * Hence this must not qualify as pmd_bad(). | |
628 | */ | |
399145f9 AK |
629 | pmd_populate(mm, pmdp, pgtable); |
630 | pmd = READ_ONCE(*pmdp); | |
631 | WARN_ON(pmd_bad(pmd)); | |
632 | } | |
633 | ||
05289402 AK |
634 | static void __init pte_special_tests(unsigned long pfn, pgprot_t prot) |
635 | { | |
636 | pte_t pte = pfn_pte(pfn, prot); | |
637 | ||
638 | if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL)) | |
639 | return; | |
640 | ||
6315df41 | 641 | pr_debug("Validating PTE special\n"); |
05289402 AK |
642 | WARN_ON(!pte_special(pte_mkspecial(pte))); |
643 | } | |
644 | ||
645 | static void __init pte_protnone_tests(unsigned long pfn, pgprot_t prot) | |
646 | { | |
647 | pte_t pte = pfn_pte(pfn, prot); | |
648 | ||
649 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) | |
650 | return; | |
651 | ||
6315df41 | 652 | pr_debug("Validating PTE protnone\n"); |
05289402 AK |
653 | WARN_ON(!pte_protnone(pte)); |
654 | WARN_ON(!pte_present(pte)); | |
655 | } | |
656 | ||
657 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
658 | static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) | |
659 | { | |
65ac1a60 | 660 | pmd_t pmd; |
05289402 AK |
661 | |
662 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) | |
663 | return; | |
664 | ||
65ac1a60 AK |
665 | if (!has_transparent_hugepage()) |
666 | return; | |
667 | ||
6315df41 | 668 | pr_debug("Validating PMD protnone\n"); |
65ac1a60 | 669 | pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); |
05289402 AK |
670 | WARN_ON(!pmd_protnone(pmd)); |
671 | WARN_ON(!pmd_present(pmd)); | |
672 | } | |
673 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
674 | static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) { } | |
675 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
676 | ||
677 | #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP | |
678 | static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) | |
679 | { | |
680 | pte_t pte = pfn_pte(pfn, prot); | |
681 | ||
6315df41 | 682 | pr_debug("Validating PTE devmap\n"); |
05289402 AK |
683 | WARN_ON(!pte_devmap(pte_mkdevmap(pte))); |
684 | } | |
685 | ||
686 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
687 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) | |
688 | { | |
65ac1a60 AK |
689 | pmd_t pmd; |
690 | ||
691 | if (!has_transparent_hugepage()) | |
692 | return; | |
05289402 | 693 | |
6315df41 | 694 | pr_debug("Validating PMD devmap\n"); |
65ac1a60 | 695 | pmd = pfn_pmd(pfn, prot); |
05289402 AK |
696 | WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd))); |
697 | } | |
698 | ||
699 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
700 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) | |
701 | { | |
65ac1a60 AK |
702 | pud_t pud; |
703 | ||
704 | if (!has_transparent_hugepage()) | |
705 | return; | |
05289402 | 706 | |
6315df41 | 707 | pr_debug("Validating PUD devmap\n"); |
65ac1a60 | 708 | pud = pfn_pud(pfn, prot); |
05289402 AK |
709 | WARN_ON(!pud_devmap(pud_mkdevmap(pud))); |
710 | } | |
711 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
712 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
713 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
714 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
715 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
716 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
717 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
718 | #else | |
719 | static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
720 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
721 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
722 | #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ | |
723 | ||
724 | static void __init pte_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
725 | { | |
726 | pte_t pte = pfn_pte(pfn, prot); | |
727 | ||
728 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
729 | return; | |
730 | ||
6315df41 | 731 | pr_debug("Validating PTE soft dirty\n"); |
05289402 AK |
732 | WARN_ON(!pte_soft_dirty(pte_mksoft_dirty(pte))); |
733 | WARN_ON(pte_soft_dirty(pte_clear_soft_dirty(pte))); | |
734 | } | |
735 | ||
736 | static void __init pte_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
737 | { | |
738 | pte_t pte = pfn_pte(pfn, prot); | |
739 | ||
740 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
741 | return; | |
742 | ||
6315df41 | 743 | pr_debug("Validating PTE swap soft dirty\n"); |
05289402 AK |
744 | WARN_ON(!pte_swp_soft_dirty(pte_swp_mksoft_dirty(pte))); |
745 | WARN_ON(pte_swp_soft_dirty(pte_swp_clear_soft_dirty(pte))); | |
746 | } | |
747 | ||
748 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
749 | static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
750 | { | |
65ac1a60 | 751 | pmd_t pmd; |
05289402 AK |
752 | |
753 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
754 | return; | |
755 | ||
65ac1a60 AK |
756 | if (!has_transparent_hugepage()) |
757 | return; | |
758 | ||
6315df41 | 759 | pr_debug("Validating PMD soft dirty\n"); |
65ac1a60 | 760 | pmd = pfn_pmd(pfn, prot); |
05289402 AK |
761 | WARN_ON(!pmd_soft_dirty(pmd_mksoft_dirty(pmd))); |
762 | WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd))); | |
763 | } | |
764 | ||
765 | static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
766 | { | |
65ac1a60 | 767 | pmd_t pmd; |
05289402 AK |
768 | |
769 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) || | |
770 | !IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION)) | |
771 | return; | |
772 | ||
65ac1a60 AK |
773 | if (!has_transparent_hugepage()) |
774 | return; | |
775 | ||
6315df41 | 776 | pr_debug("Validating PMD swap soft dirty\n"); |
65ac1a60 | 777 | pmd = pfn_pmd(pfn, prot); |
05289402 AK |
778 | WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd))); |
779 | WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd))); | |
780 | } | |
b593b90d | 781 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
05289402 AK |
782 | static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) { } |
783 | static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
784 | { | |
785 | } | |
b593b90d | 786 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
05289402 AK |
787 | |
788 | static void __init pte_swap_tests(unsigned long pfn, pgprot_t prot) | |
789 | { | |
790 | swp_entry_t swp; | |
791 | pte_t pte; | |
792 | ||
6315df41 | 793 | pr_debug("Validating PTE swap\n"); |
05289402 AK |
794 | pte = pfn_pte(pfn, prot); |
795 | swp = __pte_to_swp_entry(pte); | |
796 | pte = __swp_entry_to_pte(swp); | |
797 | WARN_ON(pfn != pte_pfn(pte)); | |
798 | } | |
799 | ||
800 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
801 | static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) | |
802 | { | |
803 | swp_entry_t swp; | |
804 | pmd_t pmd; | |
805 | ||
65ac1a60 AK |
806 | if (!has_transparent_hugepage()) |
807 | return; | |
808 | ||
6315df41 | 809 | pr_debug("Validating PMD swap\n"); |
05289402 AK |
810 | pmd = pfn_pmd(pfn, prot); |
811 | swp = __pmd_to_swp_entry(pmd); | |
812 | pmd = __swp_entry_to_pmd(swp); | |
813 | WARN_ON(pfn != pmd_pfn(pmd)); | |
814 | } | |
815 | #else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */ | |
816 | static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { } | |
817 | #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ | |
818 | ||
819 | static void __init swap_migration_tests(void) | |
820 | { | |
821 | struct page *page; | |
822 | swp_entry_t swp; | |
823 | ||
824 | if (!IS_ENABLED(CONFIG_MIGRATION)) | |
825 | return; | |
6315df41 AK |
826 | |
827 | pr_debug("Validating swap migration\n"); | |
05289402 AK |
828 | /* |
829 | * swap_migration_tests() requires a dedicated page as it needs to | |
830 | * be locked before creating a migration entry from it. Locking the | |
831 | * page that actually maps kernel text ('start_kernel') can be real | |
832 | * problematic. Lets allocate a dedicated page explicitly for this | |
833 | * purpose that will be freed subsequently. | |
834 | */ | |
835 | page = alloc_page(GFP_KERNEL); | |
836 | if (!page) { | |
837 | pr_err("page allocation failed\n"); | |
838 | return; | |
839 | } | |
840 | ||
841 | /* | |
842 | * make_migration_entry() expects given page to be | |
843 | * locked, otherwise it stumbles upon a BUG_ON(). | |
844 | */ | |
845 | __SetPageLocked(page); | |
4dd845b5 | 846 | swp = make_writable_migration_entry(page_to_pfn(page)); |
05289402 | 847 | WARN_ON(!is_migration_entry(swp)); |
4dd845b5 | 848 | WARN_ON(!is_writable_migration_entry(swp)); |
05289402 | 849 | |
4dd845b5 | 850 | swp = make_readable_migration_entry(swp_offset(swp)); |
05289402 | 851 | WARN_ON(!is_migration_entry(swp)); |
4dd845b5 | 852 | WARN_ON(is_writable_migration_entry(swp)); |
05289402 | 853 | |
4dd845b5 | 854 | swp = make_readable_migration_entry(page_to_pfn(page)); |
05289402 | 855 | WARN_ON(!is_migration_entry(swp)); |
4dd845b5 | 856 | WARN_ON(is_writable_migration_entry(swp)); |
05289402 AK |
857 | __ClearPageLocked(page); |
858 | __free_page(page); | |
859 | } | |
860 | ||
861 | #ifdef CONFIG_HUGETLB_PAGE | |
862 | static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) | |
863 | { | |
864 | struct page *page; | |
865 | pte_t pte; | |
866 | ||
6315df41 | 867 | pr_debug("Validating HugeTLB basic\n"); |
05289402 AK |
868 | /* |
869 | * Accessing the page associated with the pfn is safe here, | |
870 | * as it was previously derived from a real kernel symbol. | |
871 | */ | |
872 | page = pfn_to_page(pfn); | |
873 | pte = mk_huge_pte(page, prot); | |
874 | ||
875 | WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte))); | |
876 | WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte)))); | |
877 | WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte)))); | |
878 | ||
879 | #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB | |
880 | pte = pfn_pte(pfn, prot); | |
881 | ||
882 | WARN_ON(!pte_huge(pte_mkhuge(pte))); | |
883 | #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ | |
884 | } | |
885 | #else /* !CONFIG_HUGETLB_PAGE */ | |
886 | static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { } | |
887 | #endif /* CONFIG_HUGETLB_PAGE */ | |
888 | ||
889 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
890 | static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) | |
891 | { | |
892 | pmd_t pmd; | |
893 | ||
894 | if (!has_transparent_hugepage()) | |
895 | return; | |
896 | ||
6315df41 | 897 | pr_debug("Validating PMD based THP\n"); |
05289402 AK |
898 | /* |
899 | * pmd_trans_huge() and pmd_present() must return positive after | |
900 | * MMU invalidation with pmd_mkinvalid(). This behavior is an | |
901 | * optimization for transparent huge page. pmd_trans_huge() must | |
902 | * be true if pmd_page() returns a valid THP to avoid taking the | |
903 | * pmd_lock when others walk over non transhuge pmds (i.e. there | |
904 | * are no THP allocated). Especially when splitting a THP and | |
905 | * removing the present bit from the pmd, pmd_trans_huge() still | |
906 | * needs to return true. pmd_present() should be true whenever | |
907 | * pmd_trans_huge() returns true. | |
908 | */ | |
909 | pmd = pfn_pmd(pfn, prot); | |
910 | WARN_ON(!pmd_trans_huge(pmd_mkhuge(pmd))); | |
911 | ||
912 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE | |
913 | WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd)))); | |
914 | WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd)))); | |
915 | #endif /* __HAVE_ARCH_PMDP_INVALIDATE */ | |
916 | } | |
917 | ||
918 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
919 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) | |
920 | { | |
921 | pud_t pud; | |
922 | ||
923 | if (!has_transparent_hugepage()) | |
924 | return; | |
925 | ||
6315df41 | 926 | pr_debug("Validating PUD based THP\n"); |
05289402 AK |
927 | pud = pfn_pud(pfn, prot); |
928 | WARN_ON(!pud_trans_huge(pud_mkhuge(pud))); | |
929 | ||
930 | /* | |
931 | * pud_mkinvalid() has been dropped for now. Enable back | |
932 | * these tests when it comes back with a modified pud_present(). | |
933 | * | |
934 | * WARN_ON(!pud_trans_huge(pud_mkinvalid(pud_mkhuge(pud)))); | |
935 | * WARN_ON(!pud_present(pud_mkinvalid(pud_mkhuge(pud)))); | |
936 | */ | |
937 | } | |
938 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
939 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
940 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
941 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
942 | static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
943 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
944 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
945 | ||
399145f9 AK |
946 | static unsigned long __init get_random_vaddr(void) |
947 | { | |
948 | unsigned long random_vaddr, random_pages, total_user_pages; | |
949 | ||
950 | total_user_pages = (TASK_SIZE - FIRST_USER_ADDRESS) / PAGE_SIZE; | |
951 | ||
952 | random_pages = get_random_long() % total_user_pages; | |
953 | random_vaddr = FIRST_USER_ADDRESS + random_pages * PAGE_SIZE; | |
954 | ||
955 | return random_vaddr; | |
956 | } | |
957 | ||
958 | static int __init debug_vm_pgtable(void) | |
959 | { | |
a5c3b9ff | 960 | struct vm_area_struct *vma; |
399145f9 AK |
961 | struct mm_struct *mm; |
962 | pgd_t *pgdp; | |
963 | p4d_t *p4dp, *saved_p4dp; | |
964 | pud_t *pudp, *saved_pudp; | |
965 | pmd_t *pmdp, *saved_pmdp, pmd; | |
966 | pte_t *ptep; | |
967 | pgtable_t saved_ptep; | |
05289402 | 968 | pgprot_t prot, protnone; |
399145f9 AK |
969 | phys_addr_t paddr; |
970 | unsigned long vaddr, pte_aligned, pmd_aligned; | |
971 | unsigned long pud_aligned, p4d_aligned, pgd_aligned; | |
fea1120c | 972 | spinlock_t *ptl = NULL; |
2e326c07 | 973 | int idx; |
399145f9 AK |
974 | |
975 | pr_info("Validating architecture page table helpers\n"); | |
976 | prot = vm_get_page_prot(VMFLAGS); | |
977 | vaddr = get_random_vaddr(); | |
978 | mm = mm_alloc(); | |
979 | if (!mm) { | |
980 | pr_err("mm_struct allocation failed\n"); | |
981 | return 1; | |
982 | } | |
983 | ||
05289402 AK |
984 | /* |
985 | * __P000 (or even __S000) will help create page table entries with | |
986 | * PROT_NONE permission as required for pxx_protnone_tests(). | |
987 | */ | |
988 | protnone = __P000; | |
989 | ||
a5c3b9ff AK |
990 | vma = vm_area_alloc(mm); |
991 | if (!vma) { | |
992 | pr_err("vma allocation failed\n"); | |
993 | return 1; | |
994 | } | |
995 | ||
399145f9 AK |
996 | /* |
997 | * PFN for mapping at PTE level is determined from a standard kernel | |
998 | * text symbol. But pfns for higher page table levels are derived by | |
999 | * masking lower bits of this real pfn. These derived pfns might not | |
1000 | * exist on the platform but that does not really matter as pfn_pxx() | |
1001 | * helpers will still create appropriate entries for the test. This | |
1002 | * helps avoid large memory block allocations to be used for mapping | |
1003 | * at higher page table levels. | |
1004 | */ | |
1005 | paddr = __pa_symbol(&start_kernel); | |
1006 | ||
1007 | pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT; | |
1008 | pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT; | |
1009 | pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT; | |
1010 | p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT; | |
1011 | pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT; | |
1012 | WARN_ON(!pfn_valid(pte_aligned)); | |
1013 | ||
1014 | pgdp = pgd_offset(mm, vaddr); | |
1015 | p4dp = p4d_alloc(mm, pgdp, vaddr); | |
1016 | pudp = pud_alloc(mm, p4dp, vaddr); | |
1017 | pmdp = pmd_alloc(mm, pudp, vaddr); | |
f14312e1 AK |
1018 | /* |
1019 | * Allocate pgtable_t | |
1020 | */ | |
1021 | if (pte_alloc(mm, pmdp)) { | |
1022 | pr_err("pgtable allocation failed\n"); | |
1023 | return 1; | |
1024 | } | |
399145f9 AK |
1025 | |
1026 | /* | |
1027 | * Save all the page table page addresses as the page table | |
1028 | * entries will be used for testing with random or garbage | |
1029 | * values. These saved addresses will be used for freeing | |
1030 | * page table pages. | |
1031 | */ | |
1032 | pmd = READ_ONCE(*pmdp); | |
1033 | saved_p4dp = p4d_offset(pgdp, 0UL); | |
1034 | saved_pudp = pud_offset(p4dp, 0UL); | |
1035 | saved_pmdp = pmd_offset(pudp, 0UL); | |
1036 | saved_ptep = pmd_pgtable(pmd); | |
1037 | ||
2e326c07 AK |
1038 | /* |
1039 | * Iterate over the protection_map[] to make sure that all | |
1040 | * the basic page table transformation validations just hold | |
1041 | * true irrespective of the starting protection value for a | |
1042 | * given page table entry. | |
1043 | */ | |
1044 | for (idx = 0; idx < ARRAY_SIZE(protection_map); idx++) { | |
1045 | pte_basic_tests(pte_aligned, idx); | |
1046 | pmd_basic_tests(pmd_aligned, idx); | |
1047 | pud_basic_tests(mm, pud_aligned, idx); | |
1048 | } | |
1049 | ||
1050 | /* | |
1051 | * Both P4D and PGD level tests are very basic which do not | |
1052 | * involve creating page table entries from the protection | |
1053 | * value and the given pfn. Hence just keep them out from | |
1054 | * the above iteration for now to save some test execution | |
1055 | * time. | |
1056 | */ | |
399145f9 AK |
1057 | p4d_basic_tests(p4d_aligned, prot); |
1058 | pgd_basic_tests(pgd_aligned, prot); | |
1059 | ||
a5c3b9ff AK |
1060 | pmd_leaf_tests(pmd_aligned, prot); |
1061 | pud_leaf_tests(pud_aligned, prot); | |
1062 | ||
4200605b AK |
1063 | pte_savedwrite_tests(pte_aligned, protnone); |
1064 | pmd_savedwrite_tests(pmd_aligned, protnone); | |
a5c3b9ff | 1065 | |
05289402 AK |
1066 | pte_special_tests(pte_aligned, prot); |
1067 | pte_protnone_tests(pte_aligned, protnone); | |
1068 | pmd_protnone_tests(pmd_aligned, protnone); | |
1069 | ||
1070 | pte_devmap_tests(pte_aligned, prot); | |
1071 | pmd_devmap_tests(pmd_aligned, prot); | |
1072 | pud_devmap_tests(pud_aligned, prot); | |
1073 | ||
1074 | pte_soft_dirty_tests(pte_aligned, prot); | |
1075 | pmd_soft_dirty_tests(pmd_aligned, prot); | |
1076 | pte_swap_soft_dirty_tests(pte_aligned, prot); | |
1077 | pmd_swap_soft_dirty_tests(pmd_aligned, prot); | |
1078 | ||
1079 | pte_swap_tests(pte_aligned, prot); | |
1080 | pmd_swap_tests(pmd_aligned, prot); | |
1081 | ||
1082 | swap_migration_tests(); | |
05289402 AK |
1083 | |
1084 | pmd_thp_tests(pmd_aligned, prot); | |
1085 | pud_thp_tests(pud_aligned, prot); | |
1086 | ||
e8edf0ad AK |
1087 | hugetlb_basic_tests(pte_aligned, prot); |
1088 | ||
6f302e27 AK |
1089 | /* |
1090 | * Page table modifying tests. They need to hold | |
1091 | * proper page table lock. | |
1092 | */ | |
e8edf0ad | 1093 | |
f14312e1 | 1094 | ptep = pte_offset_map_lock(mm, pmdp, vaddr, &ptl); |
401035d5 | 1095 | pte_clear_tests(mm, ptep, pte_aligned, vaddr, prot); |
e8edf0ad | 1096 | pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); |
6f302e27 | 1097 | pte_unmap_unlock(ptep, ptl); |
e8edf0ad | 1098 | |
6f302e27 AK |
1099 | ptl = pmd_lock(mm, pmdp); |
1100 | pmd_clear_tests(mm, pmdp); | |
87f34986 | 1101 | pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot, saved_ptep); |
e8edf0ad | 1102 | pmd_huge_tests(pmdp, pmd_aligned, prot); |
6f302e27 AK |
1103 | pmd_populate_tests(mm, pmdp, saved_ptep); |
1104 | spin_unlock(ptl); | |
1105 | ||
1106 | ptl = pud_lock(mm, pudp); | |
1107 | pud_clear_tests(mm, pudp); | |
1108 | pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot); | |
e8edf0ad | 1109 | pud_huge_tests(pudp, pud_aligned, prot); |
6f302e27 AK |
1110 | pud_populate_tests(mm, pudp, saved_pmdp); |
1111 | spin_unlock(ptl); | |
e8edf0ad | 1112 | |
6f302e27 AK |
1113 | spin_lock(&mm->page_table_lock); |
1114 | p4d_clear_tests(mm, p4dp); | |
1115 | pgd_clear_tests(mm, pgdp); | |
e8edf0ad AK |
1116 | p4d_populate_tests(mm, p4dp, saved_pudp); |
1117 | pgd_populate_tests(mm, pgdp, saved_p4dp); | |
6f302e27 | 1118 | spin_unlock(&mm->page_table_lock); |
e8edf0ad | 1119 | |
399145f9 AK |
1120 | p4d_free(mm, saved_p4dp); |
1121 | pud_free(mm, saved_pudp); | |
1122 | pmd_free(mm, saved_pmdp); | |
1123 | pte_free(mm, saved_ptep); | |
1124 | ||
a5c3b9ff | 1125 | vm_area_free(vma); |
399145f9 AK |
1126 | mm_dec_nr_puds(mm); |
1127 | mm_dec_nr_pmds(mm); | |
1128 | mm_dec_nr_ptes(mm); | |
1129 | mmdrop(mm); | |
1130 | return 0; | |
1131 | } | |
1132 | late_initcall(debug_vm_pgtable); |