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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 | { | |
94 | pte_t pte = pfn_pte(pfn, prot); | |
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]; |
399145f9 | 149 | pmd_t pmd = pfn_pmd(pfn, prot); |
2e326c07 | 150 | unsigned long val = idx, *ptr = &val; |
399145f9 | 151 | |
787d563b AK |
152 | if (!has_transparent_hugepage()) |
153 | return; | |
154 | ||
2e326c07 | 155 | pr_debug("Validating PMD basic (%pGv)\n", ptr); |
bb5c47ce AK |
156 | |
157 | /* | |
158 | * This test needs to be executed after the given page table entry | |
159 | * is created with pfn_pmd() to make sure that protection_map[idx] | |
160 | * does not have the dirty bit enabled from the beginning. This is | |
161 | * important for platforms like arm64 where (!PTE_RDONLY) indicate | |
162 | * dirty bit being set. | |
163 | */ | |
164 | WARN_ON(pmd_dirty(pmd_wrprotect(pmd))); | |
165 | ||
166 | ||
399145f9 AK |
167 | WARN_ON(!pmd_same(pmd, pmd)); |
168 | WARN_ON(!pmd_young(pmd_mkyoung(pmd_mkold(pmd)))); | |
169 | WARN_ON(!pmd_dirty(pmd_mkdirty(pmd_mkclean(pmd)))); | |
170 | WARN_ON(!pmd_write(pmd_mkwrite(pmd_wrprotect(pmd)))); | |
171 | WARN_ON(pmd_young(pmd_mkold(pmd_mkyoung(pmd)))); | |
172 | WARN_ON(pmd_dirty(pmd_mkclean(pmd_mkdirty(pmd)))); | |
173 | WARN_ON(pmd_write(pmd_wrprotect(pmd_mkwrite(pmd)))); | |
bb5c47ce AK |
174 | WARN_ON(pmd_dirty(pmd_wrprotect(pmd_mkclean(pmd)))); |
175 | WARN_ON(!pmd_dirty(pmd_wrprotect(pmd_mkdirty(pmd)))); | |
399145f9 AK |
176 | /* |
177 | * A huge page does not point to next level page table | |
178 | * entry. Hence this must qualify as pmd_bad(). | |
179 | */ | |
180 | WARN_ON(!pmd_bad(pmd_mkhuge(pmd))); | |
181 | } | |
182 | ||
a5c3b9ff AK |
183 | static void __init pmd_advanced_tests(struct mm_struct *mm, |
184 | struct vm_area_struct *vma, pmd_t *pmdp, | |
185 | unsigned long pfn, unsigned long vaddr, | |
87f34986 | 186 | pgprot_t prot, pgtable_t pgtable) |
a5c3b9ff AK |
187 | { |
188 | pmd_t pmd = pfn_pmd(pfn, prot); | |
189 | ||
190 | if (!has_transparent_hugepage()) | |
191 | return; | |
192 | ||
6315df41 | 193 | pr_debug("Validating PMD advanced\n"); |
a5c3b9ff AK |
194 | /* Align the address wrt HPAGE_PMD_SIZE */ |
195 | vaddr = (vaddr & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE; | |
196 | ||
87f34986 AK |
197 | pgtable_trans_huge_deposit(mm, pmdp, pgtable); |
198 | ||
a5c3b9ff AK |
199 | pmd = pfn_pmd(pfn, prot); |
200 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
201 | pmdp_set_wrprotect(mm, vaddr, pmdp); | |
202 | pmd = READ_ONCE(*pmdp); | |
203 | WARN_ON(pmd_write(pmd)); | |
a5c3b9ff AK |
204 | pmdp_huge_get_and_clear(mm, vaddr, pmdp); |
205 | pmd = READ_ONCE(*pmdp); | |
206 | WARN_ON(!pmd_none(pmd)); | |
207 | ||
208 | pmd = pfn_pmd(pfn, prot); | |
209 | pmd = pmd_wrprotect(pmd); | |
210 | pmd = pmd_mkclean(pmd); | |
211 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
212 | pmd = pmd_mkwrite(pmd); | |
213 | pmd = pmd_mkdirty(pmd); | |
214 | pmdp_set_access_flags(vma, vaddr, pmdp, pmd, 1); | |
215 | pmd = READ_ONCE(*pmdp); | |
216 | WARN_ON(!(pmd_write(pmd) && pmd_dirty(pmd))); | |
a5c3b9ff AK |
217 | pmdp_huge_get_and_clear_full(vma, vaddr, pmdp, 1); |
218 | pmd = READ_ONCE(*pmdp); | |
219 | WARN_ON(!pmd_none(pmd)); | |
220 | ||
c3824e18 | 221 | pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); |
a5c3b9ff AK |
222 | pmd = pmd_mkyoung(pmd); |
223 | set_pmd_at(mm, vaddr, pmdp, pmd); | |
224 | pmdp_test_and_clear_young(vma, vaddr, pmdp); | |
225 | pmd = READ_ONCE(*pmdp); | |
226 | WARN_ON(pmd_young(pmd)); | |
87f34986 | 227 | |
13af0506 AK |
228 | /* Clear the pte entries */ |
229 | pmdp_huge_get_and_clear(mm, vaddr, pmdp); | |
87f34986 | 230 | pgtable = pgtable_trans_huge_withdraw(mm, pmdp); |
a5c3b9ff AK |
231 | } |
232 | ||
233 | static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) | |
234 | { | |
235 | pmd_t pmd = pfn_pmd(pfn, prot); | |
236 | ||
6315df41 | 237 | pr_debug("Validating PMD leaf\n"); |
a5c3b9ff AK |
238 | /* |
239 | * PMD based THP is a leaf entry. | |
240 | */ | |
241 | pmd = pmd_mkhuge(pmd); | |
242 | WARN_ON(!pmd_leaf(pmd)); | |
243 | } | |
244 | ||
85a14463 | 245 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP |
a5c3b9ff AK |
246 | static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) |
247 | { | |
248 | pmd_t pmd; | |
249 | ||
bbc180a5 | 250 | if (!arch_vmap_pmd_supported(prot)) |
a5c3b9ff | 251 | return; |
6315df41 AK |
252 | |
253 | pr_debug("Validating PMD huge\n"); | |
a5c3b9ff AK |
254 | /* |
255 | * X86 defined pmd_set_huge() verifies that the given | |
256 | * PMD is not a populated non-leaf entry. | |
257 | */ | |
258 | WRITE_ONCE(*pmdp, __pmd(0)); | |
259 | WARN_ON(!pmd_set_huge(pmdp, __pfn_to_phys(pfn), prot)); | |
260 | WARN_ON(!pmd_clear_huge(pmdp)); | |
261 | pmd = READ_ONCE(*pmdp); | |
262 | WARN_ON(!pmd_none(pmd)); | |
263 | } | |
85a14463 AK |
264 | #else /* CONFIG_HAVE_ARCH_HUGE_VMAP */ |
265 | static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) { } | |
266 | #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ | |
a5c3b9ff AK |
267 | |
268 | static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) | |
269 | { | |
270 | pmd_t pmd = pfn_pmd(pfn, prot); | |
271 | ||
4200605b AK |
272 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) |
273 | return; | |
274 | ||
6315df41 | 275 | pr_debug("Validating PMD saved write\n"); |
a5c3b9ff AK |
276 | WARN_ON(!pmd_savedwrite(pmd_mk_savedwrite(pmd_clear_savedwrite(pmd)))); |
277 | WARN_ON(pmd_savedwrite(pmd_clear_savedwrite(pmd_mk_savedwrite(pmd)))); | |
278 | } | |
279 | ||
399145f9 | 280 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD |
2e326c07 | 281 | static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) |
399145f9 | 282 | { |
2e326c07 | 283 | pgprot_t prot = protection_map[idx]; |
399145f9 | 284 | pud_t pud = pfn_pud(pfn, prot); |
2e326c07 | 285 | unsigned long val = idx, *ptr = &val; |
399145f9 | 286 | |
787d563b AK |
287 | if (!has_transparent_hugepage()) |
288 | return; | |
289 | ||
2e326c07 | 290 | pr_debug("Validating PUD basic (%pGv)\n", ptr); |
bb5c47ce AK |
291 | |
292 | /* | |
293 | * This test needs to be executed after the given page table entry | |
294 | * is created with pfn_pud() to make sure that protection_map[idx] | |
295 | * does not have the dirty bit enabled from the beginning. This is | |
296 | * important for platforms like arm64 where (!PTE_RDONLY) indicate | |
297 | * dirty bit being set. | |
298 | */ | |
299 | WARN_ON(pud_dirty(pud_wrprotect(pud))); | |
300 | ||
399145f9 AK |
301 | WARN_ON(!pud_same(pud, pud)); |
302 | WARN_ON(!pud_young(pud_mkyoung(pud_mkold(pud)))); | |
bb5c47ce AK |
303 | WARN_ON(!pud_dirty(pud_mkdirty(pud_mkclean(pud)))); |
304 | WARN_ON(pud_dirty(pud_mkclean(pud_mkdirty(pud)))); | |
399145f9 AK |
305 | WARN_ON(!pud_write(pud_mkwrite(pud_wrprotect(pud)))); |
306 | WARN_ON(pud_write(pud_wrprotect(pud_mkwrite(pud)))); | |
307 | WARN_ON(pud_young(pud_mkold(pud_mkyoung(pud)))); | |
bb5c47ce AK |
308 | WARN_ON(pud_dirty(pud_wrprotect(pud_mkclean(pud)))); |
309 | WARN_ON(!pud_dirty(pud_wrprotect(pud_mkdirty(pud)))); | |
399145f9 AK |
310 | |
311 | if (mm_pmd_folded(mm)) | |
312 | return; | |
313 | ||
314 | /* | |
315 | * A huge page does not point to next level page table | |
316 | * entry. Hence this must qualify as pud_bad(). | |
317 | */ | |
318 | WARN_ON(!pud_bad(pud_mkhuge(pud))); | |
319 | } | |
a5c3b9ff AK |
320 | |
321 | static void __init pud_advanced_tests(struct mm_struct *mm, | |
322 | struct vm_area_struct *vma, pud_t *pudp, | |
323 | unsigned long pfn, unsigned long vaddr, | |
324 | pgprot_t prot) | |
325 | { | |
326 | pud_t pud = pfn_pud(pfn, prot); | |
327 | ||
328 | if (!has_transparent_hugepage()) | |
329 | return; | |
330 | ||
6315df41 | 331 | pr_debug("Validating PUD advanced\n"); |
a5c3b9ff AK |
332 | /* Align the address wrt HPAGE_PUD_SIZE */ |
333 | vaddr = (vaddr & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE; | |
334 | ||
335 | set_pud_at(mm, vaddr, pudp, pud); | |
336 | pudp_set_wrprotect(mm, vaddr, pudp); | |
337 | pud = READ_ONCE(*pudp); | |
338 | WARN_ON(pud_write(pud)); | |
339 | ||
340 | #ifndef __PAGETABLE_PMD_FOLDED | |
a5c3b9ff AK |
341 | pudp_huge_get_and_clear(mm, vaddr, pudp); |
342 | pud = READ_ONCE(*pudp); | |
343 | WARN_ON(!pud_none(pud)); | |
a5c3b9ff AK |
344 | #endif /* __PAGETABLE_PMD_FOLDED */ |
345 | pud = pfn_pud(pfn, prot); | |
346 | pud = pud_wrprotect(pud); | |
347 | pud = pud_mkclean(pud); | |
348 | set_pud_at(mm, vaddr, pudp, pud); | |
349 | pud = pud_mkwrite(pud); | |
350 | pud = pud_mkdirty(pud); | |
351 | pudp_set_access_flags(vma, vaddr, pudp, pud, 1); | |
352 | pud = READ_ONCE(*pudp); | |
353 | WARN_ON(!(pud_write(pud) && pud_dirty(pud))); | |
354 | ||
c3824e18 AK |
355 | #ifndef __PAGETABLE_PMD_FOLDED |
356 | pudp_huge_get_and_clear_full(mm, vaddr, pudp, 1); | |
357 | pud = READ_ONCE(*pudp); | |
358 | WARN_ON(!pud_none(pud)); | |
359 | #endif /* __PAGETABLE_PMD_FOLDED */ | |
360 | ||
361 | pud = pfn_pud(pfn, prot); | |
a5c3b9ff AK |
362 | pud = pud_mkyoung(pud); |
363 | set_pud_at(mm, vaddr, pudp, pud); | |
364 | pudp_test_and_clear_young(vma, vaddr, pudp); | |
365 | pud = READ_ONCE(*pudp); | |
366 | WARN_ON(pud_young(pud)); | |
13af0506 AK |
367 | |
368 | pudp_huge_get_and_clear(mm, vaddr, pudp); | |
a5c3b9ff AK |
369 | } |
370 | ||
371 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) | |
372 | { | |
373 | pud_t pud = pfn_pud(pfn, prot); | |
374 | ||
6315df41 | 375 | pr_debug("Validating PUD leaf\n"); |
a5c3b9ff AK |
376 | /* |
377 | * PUD based THP is a leaf entry. | |
378 | */ | |
379 | pud = pud_mkhuge(pud); | |
380 | WARN_ON(!pud_leaf(pud)); | |
381 | } | |
382 | ||
85a14463 | 383 | #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP |
a5c3b9ff AK |
384 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) |
385 | { | |
386 | pud_t pud; | |
387 | ||
bbc180a5 | 388 | if (!arch_vmap_pud_supported(prot)) |
a5c3b9ff | 389 | return; |
6315df41 AK |
390 | |
391 | pr_debug("Validating PUD huge\n"); | |
a5c3b9ff AK |
392 | /* |
393 | * X86 defined pud_set_huge() verifies that the given | |
394 | * PUD is not a populated non-leaf entry. | |
395 | */ | |
396 | WRITE_ONCE(*pudp, __pud(0)); | |
397 | WARN_ON(!pud_set_huge(pudp, __pfn_to_phys(pfn), prot)); | |
398 | WARN_ON(!pud_clear_huge(pudp)); | |
399 | pud = READ_ONCE(*pudp); | |
400 | WARN_ON(!pud_none(pud)); | |
401 | } | |
85a14463 AK |
402 | #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ |
403 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) { } | |
404 | #endif /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ | |
405 | ||
399145f9 | 406 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
2e326c07 | 407 | static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { } |
a5c3b9ff AK |
408 | static void __init pud_advanced_tests(struct mm_struct *mm, |
409 | struct vm_area_struct *vma, pud_t *pudp, | |
410 | unsigned long pfn, unsigned long vaddr, | |
411 | pgprot_t prot) | |
412 | { | |
413 | } | |
414 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
415 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) | |
416 | { | |
417 | } | |
399145f9 AK |
418 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ |
419 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
2e326c07 AK |
420 | static void __init pmd_basic_tests(unsigned long pfn, int idx) { } |
421 | static void __init pud_basic_tests(struct mm_struct *mm, unsigned long pfn, int idx) { } | |
a5c3b9ff AK |
422 | static void __init pmd_advanced_tests(struct mm_struct *mm, |
423 | struct vm_area_struct *vma, pmd_t *pmdp, | |
424 | unsigned long pfn, unsigned long vaddr, | |
87f34986 | 425 | pgprot_t prot, pgtable_t pgtable) |
a5c3b9ff AK |
426 | { |
427 | } | |
428 | static void __init pud_advanced_tests(struct mm_struct *mm, | |
429 | struct vm_area_struct *vma, pud_t *pudp, | |
430 | unsigned long pfn, unsigned long vaddr, | |
431 | pgprot_t prot) | |
432 | { | |
433 | } | |
434 | static void __init pmd_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
435 | static void __init pud_leaf_tests(unsigned long pfn, pgprot_t prot) { } | |
436 | static void __init pmd_huge_tests(pmd_t *pmdp, unsigned long pfn, pgprot_t prot) | |
437 | { | |
438 | } | |
439 | static void __init pud_huge_tests(pud_t *pudp, unsigned long pfn, pgprot_t prot) | |
440 | { | |
441 | } | |
442 | static void __init pmd_savedwrite_tests(unsigned long pfn, pgprot_t prot) { } | |
399145f9 AK |
443 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
444 | ||
445 | static void __init p4d_basic_tests(unsigned long pfn, pgprot_t prot) | |
446 | { | |
447 | p4d_t p4d; | |
448 | ||
6315df41 | 449 | pr_debug("Validating P4D basic\n"); |
399145f9 AK |
450 | memset(&p4d, RANDOM_NZVALUE, sizeof(p4d_t)); |
451 | WARN_ON(!p4d_same(p4d, p4d)); | |
452 | } | |
453 | ||
454 | static void __init pgd_basic_tests(unsigned long pfn, pgprot_t prot) | |
455 | { | |
456 | pgd_t pgd; | |
457 | ||
6315df41 | 458 | pr_debug("Validating PGD basic\n"); |
399145f9 AK |
459 | memset(&pgd, RANDOM_NZVALUE, sizeof(pgd_t)); |
460 | WARN_ON(!pgd_same(pgd, pgd)); | |
461 | } | |
462 | ||
463 | #ifndef __PAGETABLE_PUD_FOLDED | |
464 | static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) | |
465 | { | |
466 | pud_t pud = READ_ONCE(*pudp); | |
467 | ||
468 | if (mm_pmd_folded(mm)) | |
469 | return; | |
470 | ||
6315df41 | 471 | pr_debug("Validating PUD clear\n"); |
399145f9 AK |
472 | pud = __pud(pud_val(pud) | RANDOM_ORVALUE); |
473 | WRITE_ONCE(*pudp, pud); | |
474 | pud_clear(pudp); | |
475 | pud = READ_ONCE(*pudp); | |
476 | WARN_ON(!pud_none(pud)); | |
477 | } | |
478 | ||
479 | static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, | |
480 | pmd_t *pmdp) | |
481 | { | |
482 | pud_t pud; | |
483 | ||
484 | if (mm_pmd_folded(mm)) | |
485 | return; | |
6315df41 AK |
486 | |
487 | pr_debug("Validating PUD populate\n"); | |
399145f9 AK |
488 | /* |
489 | * This entry points to next level page table page. | |
490 | * Hence this must not qualify as pud_bad(). | |
491 | */ | |
399145f9 AK |
492 | pud_populate(mm, pudp, pmdp); |
493 | pud = READ_ONCE(*pudp); | |
494 | WARN_ON(pud_bad(pud)); | |
495 | } | |
496 | #else /* !__PAGETABLE_PUD_FOLDED */ | |
497 | static void __init pud_clear_tests(struct mm_struct *mm, pud_t *pudp) { } | |
498 | static void __init pud_populate_tests(struct mm_struct *mm, pud_t *pudp, | |
499 | pmd_t *pmdp) | |
500 | { | |
501 | } | |
502 | #endif /* PAGETABLE_PUD_FOLDED */ | |
503 | ||
504 | #ifndef __PAGETABLE_P4D_FOLDED | |
505 | static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) | |
506 | { | |
507 | p4d_t p4d = READ_ONCE(*p4dp); | |
508 | ||
509 | if (mm_pud_folded(mm)) | |
510 | return; | |
511 | ||
6315df41 | 512 | pr_debug("Validating P4D clear\n"); |
399145f9 AK |
513 | p4d = __p4d(p4d_val(p4d) | RANDOM_ORVALUE); |
514 | WRITE_ONCE(*p4dp, p4d); | |
515 | p4d_clear(p4dp); | |
516 | p4d = READ_ONCE(*p4dp); | |
517 | WARN_ON(!p4d_none(p4d)); | |
518 | } | |
519 | ||
520 | static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, | |
521 | pud_t *pudp) | |
522 | { | |
523 | p4d_t p4d; | |
524 | ||
525 | if (mm_pud_folded(mm)) | |
526 | return; | |
527 | ||
6315df41 | 528 | pr_debug("Validating P4D populate\n"); |
399145f9 AK |
529 | /* |
530 | * This entry points to next level page table page. | |
531 | * Hence this must not qualify as p4d_bad(). | |
532 | */ | |
533 | pud_clear(pudp); | |
534 | p4d_clear(p4dp); | |
535 | p4d_populate(mm, p4dp, pudp); | |
536 | p4d = READ_ONCE(*p4dp); | |
537 | WARN_ON(p4d_bad(p4d)); | |
538 | } | |
539 | ||
540 | static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) | |
541 | { | |
542 | pgd_t pgd = READ_ONCE(*pgdp); | |
543 | ||
544 | if (mm_p4d_folded(mm)) | |
545 | return; | |
546 | ||
6315df41 | 547 | pr_debug("Validating PGD clear\n"); |
399145f9 AK |
548 | pgd = __pgd(pgd_val(pgd) | RANDOM_ORVALUE); |
549 | WRITE_ONCE(*pgdp, pgd); | |
550 | pgd_clear(pgdp); | |
551 | pgd = READ_ONCE(*pgdp); | |
552 | WARN_ON(!pgd_none(pgd)); | |
553 | } | |
554 | ||
555 | static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, | |
556 | p4d_t *p4dp) | |
557 | { | |
558 | pgd_t pgd; | |
559 | ||
560 | if (mm_p4d_folded(mm)) | |
561 | return; | |
562 | ||
6315df41 | 563 | pr_debug("Validating PGD populate\n"); |
399145f9 AK |
564 | /* |
565 | * This entry points to next level page table page. | |
566 | * Hence this must not qualify as pgd_bad(). | |
567 | */ | |
568 | p4d_clear(p4dp); | |
569 | pgd_clear(pgdp); | |
570 | pgd_populate(mm, pgdp, p4dp); | |
571 | pgd = READ_ONCE(*pgdp); | |
572 | WARN_ON(pgd_bad(pgd)); | |
573 | } | |
574 | #else /* !__PAGETABLE_P4D_FOLDED */ | |
575 | static void __init p4d_clear_tests(struct mm_struct *mm, p4d_t *p4dp) { } | |
576 | static void __init pgd_clear_tests(struct mm_struct *mm, pgd_t *pgdp) { } | |
577 | static void __init p4d_populate_tests(struct mm_struct *mm, p4d_t *p4dp, | |
578 | pud_t *pudp) | |
579 | { | |
580 | } | |
581 | static void __init pgd_populate_tests(struct mm_struct *mm, pgd_t *pgdp, | |
582 | p4d_t *p4dp) | |
583 | { | |
584 | } | |
585 | #endif /* PAGETABLE_P4D_FOLDED */ | |
586 | ||
587 | static void __init pte_clear_tests(struct mm_struct *mm, pte_t *ptep, | |
401035d5 AK |
588 | unsigned long pfn, unsigned long vaddr, |
589 | pgprot_t prot) | |
399145f9 | 590 | { |
401035d5 | 591 | pte_t pte = pfn_pte(pfn, prot); |
399145f9 | 592 | |
6315df41 | 593 | pr_debug("Validating PTE clear\n"); |
401035d5 | 594 | #ifndef CONFIG_RISCV |
399145f9 | 595 | pte = __pte(pte_val(pte) | RANDOM_ORVALUE); |
401035d5 | 596 | #endif |
399145f9 AK |
597 | set_pte_at(mm, vaddr, ptep, pte); |
598 | barrier(); | |
599 | pte_clear(mm, vaddr, ptep); | |
9449c9cb | 600 | pte = ptep_get(ptep); |
399145f9 AK |
601 | WARN_ON(!pte_none(pte)); |
602 | } | |
603 | ||
604 | static void __init pmd_clear_tests(struct mm_struct *mm, pmd_t *pmdp) | |
605 | { | |
606 | pmd_t pmd = READ_ONCE(*pmdp); | |
607 | ||
6315df41 | 608 | pr_debug("Validating PMD clear\n"); |
399145f9 AK |
609 | pmd = __pmd(pmd_val(pmd) | RANDOM_ORVALUE); |
610 | WRITE_ONCE(*pmdp, pmd); | |
611 | pmd_clear(pmdp); | |
612 | pmd = READ_ONCE(*pmdp); | |
613 | WARN_ON(!pmd_none(pmd)); | |
614 | } | |
615 | ||
616 | static void __init pmd_populate_tests(struct mm_struct *mm, pmd_t *pmdp, | |
617 | pgtable_t pgtable) | |
618 | { | |
619 | pmd_t pmd; | |
620 | ||
6315df41 | 621 | pr_debug("Validating PMD populate\n"); |
399145f9 AK |
622 | /* |
623 | * This entry points to next level page table page. | |
624 | * Hence this must not qualify as pmd_bad(). | |
625 | */ | |
399145f9 AK |
626 | pmd_populate(mm, pmdp, pgtable); |
627 | pmd = READ_ONCE(*pmdp); | |
628 | WARN_ON(pmd_bad(pmd)); | |
629 | } | |
630 | ||
05289402 AK |
631 | static void __init pte_special_tests(unsigned long pfn, pgprot_t prot) |
632 | { | |
633 | pte_t pte = pfn_pte(pfn, prot); | |
634 | ||
635 | if (!IS_ENABLED(CONFIG_ARCH_HAS_PTE_SPECIAL)) | |
636 | return; | |
637 | ||
6315df41 | 638 | pr_debug("Validating PTE special\n"); |
05289402 AK |
639 | WARN_ON(!pte_special(pte_mkspecial(pte))); |
640 | } | |
641 | ||
642 | static void __init pte_protnone_tests(unsigned long pfn, pgprot_t prot) | |
643 | { | |
644 | pte_t pte = pfn_pte(pfn, prot); | |
645 | ||
646 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) | |
647 | return; | |
648 | ||
6315df41 | 649 | pr_debug("Validating PTE protnone\n"); |
05289402 AK |
650 | WARN_ON(!pte_protnone(pte)); |
651 | WARN_ON(!pte_present(pte)); | |
652 | } | |
653 | ||
654 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
655 | static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) | |
656 | { | |
657 | pmd_t pmd = pmd_mkhuge(pfn_pmd(pfn, prot)); | |
658 | ||
659 | if (!IS_ENABLED(CONFIG_NUMA_BALANCING)) | |
660 | return; | |
661 | ||
6315df41 | 662 | pr_debug("Validating PMD protnone\n"); |
05289402 AK |
663 | WARN_ON(!pmd_protnone(pmd)); |
664 | WARN_ON(!pmd_present(pmd)); | |
665 | } | |
666 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
667 | static void __init pmd_protnone_tests(unsigned long pfn, pgprot_t prot) { } | |
668 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
669 | ||
670 | #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP | |
671 | static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) | |
672 | { | |
673 | pte_t pte = pfn_pte(pfn, prot); | |
674 | ||
6315df41 | 675 | pr_debug("Validating PTE devmap\n"); |
05289402 AK |
676 | WARN_ON(!pte_devmap(pte_mkdevmap(pte))); |
677 | } | |
678 | ||
679 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
680 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) | |
681 | { | |
682 | pmd_t pmd = pfn_pmd(pfn, prot); | |
683 | ||
6315df41 | 684 | pr_debug("Validating PMD devmap\n"); |
05289402 AK |
685 | WARN_ON(!pmd_devmap(pmd_mkdevmap(pmd))); |
686 | } | |
687 | ||
688 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
689 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) | |
690 | { | |
691 | pud_t pud = pfn_pud(pfn, prot); | |
692 | ||
6315df41 | 693 | pr_debug("Validating PUD devmap\n"); |
05289402 AK |
694 | WARN_ON(!pud_devmap(pud_mkdevmap(pud))); |
695 | } | |
696 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
697 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
698 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
699 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
700 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
701 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
702 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
703 | #else | |
704 | static void __init pte_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
705 | static void __init pmd_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
706 | static void __init pud_devmap_tests(unsigned long pfn, pgprot_t prot) { } | |
707 | #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ | |
708 | ||
709 | static void __init pte_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
710 | { | |
711 | pte_t pte = pfn_pte(pfn, prot); | |
712 | ||
713 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
714 | return; | |
715 | ||
6315df41 | 716 | pr_debug("Validating PTE soft dirty\n"); |
05289402 AK |
717 | WARN_ON(!pte_soft_dirty(pte_mksoft_dirty(pte))); |
718 | WARN_ON(pte_soft_dirty(pte_clear_soft_dirty(pte))); | |
719 | } | |
720 | ||
721 | static void __init pte_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
722 | { | |
723 | pte_t pte = pfn_pte(pfn, prot); | |
724 | ||
725 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
726 | return; | |
727 | ||
6315df41 | 728 | pr_debug("Validating PTE swap soft dirty\n"); |
05289402 AK |
729 | WARN_ON(!pte_swp_soft_dirty(pte_swp_mksoft_dirty(pte))); |
730 | WARN_ON(pte_swp_soft_dirty(pte_swp_clear_soft_dirty(pte))); | |
731 | } | |
732 | ||
733 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
734 | static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
735 | { | |
736 | pmd_t pmd = pfn_pmd(pfn, prot); | |
737 | ||
738 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY)) | |
739 | return; | |
740 | ||
6315df41 | 741 | pr_debug("Validating PMD soft dirty\n"); |
05289402 AK |
742 | WARN_ON(!pmd_soft_dirty(pmd_mksoft_dirty(pmd))); |
743 | WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd))); | |
744 | } | |
745 | ||
746 | static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
747 | { | |
748 | pmd_t pmd = pfn_pmd(pfn, prot); | |
749 | ||
750 | if (!IS_ENABLED(CONFIG_MEM_SOFT_DIRTY) || | |
751 | !IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION)) | |
752 | return; | |
753 | ||
6315df41 | 754 | pr_debug("Validating PMD swap soft dirty\n"); |
05289402 AK |
755 | WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd))); |
756 | WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd))); | |
757 | } | |
758 | #else /* !CONFIG_ARCH_HAS_PTE_DEVMAP */ | |
759 | static void __init pmd_soft_dirty_tests(unsigned long pfn, pgprot_t prot) { } | |
760 | static void __init pmd_swap_soft_dirty_tests(unsigned long pfn, pgprot_t prot) | |
761 | { | |
762 | } | |
763 | #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ | |
764 | ||
765 | static void __init pte_swap_tests(unsigned long pfn, pgprot_t prot) | |
766 | { | |
767 | swp_entry_t swp; | |
768 | pte_t pte; | |
769 | ||
6315df41 | 770 | pr_debug("Validating PTE swap\n"); |
05289402 AK |
771 | pte = pfn_pte(pfn, prot); |
772 | swp = __pte_to_swp_entry(pte); | |
773 | pte = __swp_entry_to_pte(swp); | |
774 | WARN_ON(pfn != pte_pfn(pte)); | |
775 | } | |
776 | ||
777 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION | |
778 | static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) | |
779 | { | |
780 | swp_entry_t swp; | |
781 | pmd_t pmd; | |
782 | ||
6315df41 | 783 | pr_debug("Validating PMD swap\n"); |
05289402 AK |
784 | pmd = pfn_pmd(pfn, prot); |
785 | swp = __pmd_to_swp_entry(pmd); | |
786 | pmd = __swp_entry_to_pmd(swp); | |
787 | WARN_ON(pfn != pmd_pfn(pmd)); | |
788 | } | |
789 | #else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */ | |
790 | static void __init pmd_swap_tests(unsigned long pfn, pgprot_t prot) { } | |
791 | #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ | |
792 | ||
793 | static void __init swap_migration_tests(void) | |
794 | { | |
795 | struct page *page; | |
796 | swp_entry_t swp; | |
797 | ||
798 | if (!IS_ENABLED(CONFIG_MIGRATION)) | |
799 | return; | |
6315df41 AK |
800 | |
801 | pr_debug("Validating swap migration\n"); | |
05289402 AK |
802 | /* |
803 | * swap_migration_tests() requires a dedicated page as it needs to | |
804 | * be locked before creating a migration entry from it. Locking the | |
805 | * page that actually maps kernel text ('start_kernel') can be real | |
806 | * problematic. Lets allocate a dedicated page explicitly for this | |
807 | * purpose that will be freed subsequently. | |
808 | */ | |
809 | page = alloc_page(GFP_KERNEL); | |
810 | if (!page) { | |
811 | pr_err("page allocation failed\n"); | |
812 | return; | |
813 | } | |
814 | ||
815 | /* | |
816 | * make_migration_entry() expects given page to be | |
817 | * locked, otherwise it stumbles upon a BUG_ON(). | |
818 | */ | |
819 | __SetPageLocked(page); | |
820 | swp = make_migration_entry(page, 1); | |
821 | WARN_ON(!is_migration_entry(swp)); | |
822 | WARN_ON(!is_write_migration_entry(swp)); | |
823 | ||
824 | make_migration_entry_read(&swp); | |
825 | WARN_ON(!is_migration_entry(swp)); | |
826 | WARN_ON(is_write_migration_entry(swp)); | |
827 | ||
828 | swp = make_migration_entry(page, 0); | |
829 | WARN_ON(!is_migration_entry(swp)); | |
830 | WARN_ON(is_write_migration_entry(swp)); | |
831 | __ClearPageLocked(page); | |
832 | __free_page(page); | |
833 | } | |
834 | ||
835 | #ifdef CONFIG_HUGETLB_PAGE | |
836 | static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) | |
837 | { | |
838 | struct page *page; | |
839 | pte_t pte; | |
840 | ||
6315df41 | 841 | pr_debug("Validating HugeTLB basic\n"); |
05289402 AK |
842 | /* |
843 | * Accessing the page associated with the pfn is safe here, | |
844 | * as it was previously derived from a real kernel symbol. | |
845 | */ | |
846 | page = pfn_to_page(pfn); | |
847 | pte = mk_huge_pte(page, prot); | |
848 | ||
849 | WARN_ON(!huge_pte_dirty(huge_pte_mkdirty(pte))); | |
850 | WARN_ON(!huge_pte_write(huge_pte_mkwrite(huge_pte_wrprotect(pte)))); | |
851 | WARN_ON(huge_pte_write(huge_pte_wrprotect(huge_pte_mkwrite(pte)))); | |
852 | ||
853 | #ifdef CONFIG_ARCH_WANT_GENERAL_HUGETLB | |
854 | pte = pfn_pte(pfn, prot); | |
855 | ||
856 | WARN_ON(!pte_huge(pte_mkhuge(pte))); | |
857 | #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ | |
858 | } | |
859 | #else /* !CONFIG_HUGETLB_PAGE */ | |
860 | static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { } | |
861 | #endif /* CONFIG_HUGETLB_PAGE */ | |
862 | ||
863 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
864 | static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) | |
865 | { | |
866 | pmd_t pmd; | |
867 | ||
868 | if (!has_transparent_hugepage()) | |
869 | return; | |
870 | ||
6315df41 | 871 | pr_debug("Validating PMD based THP\n"); |
05289402 AK |
872 | /* |
873 | * pmd_trans_huge() and pmd_present() must return positive after | |
874 | * MMU invalidation with pmd_mkinvalid(). This behavior is an | |
875 | * optimization for transparent huge page. pmd_trans_huge() must | |
876 | * be true if pmd_page() returns a valid THP to avoid taking the | |
877 | * pmd_lock when others walk over non transhuge pmds (i.e. there | |
878 | * are no THP allocated). Especially when splitting a THP and | |
879 | * removing the present bit from the pmd, pmd_trans_huge() still | |
880 | * needs to return true. pmd_present() should be true whenever | |
881 | * pmd_trans_huge() returns true. | |
882 | */ | |
883 | pmd = pfn_pmd(pfn, prot); | |
884 | WARN_ON(!pmd_trans_huge(pmd_mkhuge(pmd))); | |
885 | ||
886 | #ifndef __HAVE_ARCH_PMDP_INVALIDATE | |
887 | WARN_ON(!pmd_trans_huge(pmd_mkinvalid(pmd_mkhuge(pmd)))); | |
888 | WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd)))); | |
889 | #endif /* __HAVE_ARCH_PMDP_INVALIDATE */ | |
890 | } | |
891 | ||
892 | #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD | |
893 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) | |
894 | { | |
895 | pud_t pud; | |
896 | ||
897 | if (!has_transparent_hugepage()) | |
898 | return; | |
899 | ||
6315df41 | 900 | pr_debug("Validating PUD based THP\n"); |
05289402 AK |
901 | pud = pfn_pud(pfn, prot); |
902 | WARN_ON(!pud_trans_huge(pud_mkhuge(pud))); | |
903 | ||
904 | /* | |
905 | * pud_mkinvalid() has been dropped for now. Enable back | |
906 | * these tests when it comes back with a modified pud_present(). | |
907 | * | |
908 | * WARN_ON(!pud_trans_huge(pud_mkinvalid(pud_mkhuge(pud)))); | |
909 | * WARN_ON(!pud_present(pud_mkinvalid(pud_mkhuge(pud)))); | |
910 | */ | |
911 | } | |
912 | #else /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
913 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
914 | #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ | |
915 | #else /* !CONFIG_TRANSPARENT_HUGEPAGE */ | |
916 | static void __init pmd_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
917 | static void __init pud_thp_tests(unsigned long pfn, pgprot_t prot) { } | |
918 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
919 | ||
399145f9 AK |
920 | static unsigned long __init get_random_vaddr(void) |
921 | { | |
922 | unsigned long random_vaddr, random_pages, total_user_pages; | |
923 | ||
924 | total_user_pages = (TASK_SIZE - FIRST_USER_ADDRESS) / PAGE_SIZE; | |
925 | ||
926 | random_pages = get_random_long() % total_user_pages; | |
927 | random_vaddr = FIRST_USER_ADDRESS + random_pages * PAGE_SIZE; | |
928 | ||
929 | return random_vaddr; | |
930 | } | |
931 | ||
932 | static int __init debug_vm_pgtable(void) | |
933 | { | |
a5c3b9ff | 934 | struct vm_area_struct *vma; |
399145f9 AK |
935 | struct mm_struct *mm; |
936 | pgd_t *pgdp; | |
937 | p4d_t *p4dp, *saved_p4dp; | |
938 | pud_t *pudp, *saved_pudp; | |
939 | pmd_t *pmdp, *saved_pmdp, pmd; | |
940 | pte_t *ptep; | |
941 | pgtable_t saved_ptep; | |
05289402 | 942 | pgprot_t prot, protnone; |
399145f9 AK |
943 | phys_addr_t paddr; |
944 | unsigned long vaddr, pte_aligned, pmd_aligned; | |
945 | unsigned long pud_aligned, p4d_aligned, pgd_aligned; | |
fea1120c | 946 | spinlock_t *ptl = NULL; |
2e326c07 | 947 | int idx; |
399145f9 AK |
948 | |
949 | pr_info("Validating architecture page table helpers\n"); | |
950 | prot = vm_get_page_prot(VMFLAGS); | |
951 | vaddr = get_random_vaddr(); | |
952 | mm = mm_alloc(); | |
953 | if (!mm) { | |
954 | pr_err("mm_struct allocation failed\n"); | |
955 | return 1; | |
956 | } | |
957 | ||
05289402 AK |
958 | /* |
959 | * __P000 (or even __S000) will help create page table entries with | |
960 | * PROT_NONE permission as required for pxx_protnone_tests(). | |
961 | */ | |
962 | protnone = __P000; | |
963 | ||
a5c3b9ff AK |
964 | vma = vm_area_alloc(mm); |
965 | if (!vma) { | |
966 | pr_err("vma allocation failed\n"); | |
967 | return 1; | |
968 | } | |
969 | ||
399145f9 AK |
970 | /* |
971 | * PFN for mapping at PTE level is determined from a standard kernel | |
972 | * text symbol. But pfns for higher page table levels are derived by | |
973 | * masking lower bits of this real pfn. These derived pfns might not | |
974 | * exist on the platform but that does not really matter as pfn_pxx() | |
975 | * helpers will still create appropriate entries for the test. This | |
976 | * helps avoid large memory block allocations to be used for mapping | |
977 | * at higher page table levels. | |
978 | */ | |
979 | paddr = __pa_symbol(&start_kernel); | |
980 | ||
981 | pte_aligned = (paddr & PAGE_MASK) >> PAGE_SHIFT; | |
982 | pmd_aligned = (paddr & PMD_MASK) >> PAGE_SHIFT; | |
983 | pud_aligned = (paddr & PUD_MASK) >> PAGE_SHIFT; | |
984 | p4d_aligned = (paddr & P4D_MASK) >> PAGE_SHIFT; | |
985 | pgd_aligned = (paddr & PGDIR_MASK) >> PAGE_SHIFT; | |
986 | WARN_ON(!pfn_valid(pte_aligned)); | |
987 | ||
988 | pgdp = pgd_offset(mm, vaddr); | |
989 | p4dp = p4d_alloc(mm, pgdp, vaddr); | |
990 | pudp = pud_alloc(mm, p4dp, vaddr); | |
991 | pmdp = pmd_alloc(mm, pudp, vaddr); | |
f14312e1 AK |
992 | /* |
993 | * Allocate pgtable_t | |
994 | */ | |
995 | if (pte_alloc(mm, pmdp)) { | |
996 | pr_err("pgtable allocation failed\n"); | |
997 | return 1; | |
998 | } | |
399145f9 AK |
999 | |
1000 | /* | |
1001 | * Save all the page table page addresses as the page table | |
1002 | * entries will be used for testing with random or garbage | |
1003 | * values. These saved addresses will be used for freeing | |
1004 | * page table pages. | |
1005 | */ | |
1006 | pmd = READ_ONCE(*pmdp); | |
1007 | saved_p4dp = p4d_offset(pgdp, 0UL); | |
1008 | saved_pudp = pud_offset(p4dp, 0UL); | |
1009 | saved_pmdp = pmd_offset(pudp, 0UL); | |
1010 | saved_ptep = pmd_pgtable(pmd); | |
1011 | ||
2e326c07 AK |
1012 | /* |
1013 | * Iterate over the protection_map[] to make sure that all | |
1014 | * the basic page table transformation validations just hold | |
1015 | * true irrespective of the starting protection value for a | |
1016 | * given page table entry. | |
1017 | */ | |
1018 | for (idx = 0; idx < ARRAY_SIZE(protection_map); idx++) { | |
1019 | pte_basic_tests(pte_aligned, idx); | |
1020 | pmd_basic_tests(pmd_aligned, idx); | |
1021 | pud_basic_tests(mm, pud_aligned, idx); | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Both P4D and PGD level tests are very basic which do not | |
1026 | * involve creating page table entries from the protection | |
1027 | * value and the given pfn. Hence just keep them out from | |
1028 | * the above iteration for now to save some test execution | |
1029 | * time. | |
1030 | */ | |
399145f9 AK |
1031 | p4d_basic_tests(p4d_aligned, prot); |
1032 | pgd_basic_tests(pgd_aligned, prot); | |
1033 | ||
a5c3b9ff AK |
1034 | pmd_leaf_tests(pmd_aligned, prot); |
1035 | pud_leaf_tests(pud_aligned, prot); | |
1036 | ||
4200605b AK |
1037 | pte_savedwrite_tests(pte_aligned, protnone); |
1038 | pmd_savedwrite_tests(pmd_aligned, protnone); | |
a5c3b9ff | 1039 | |
05289402 AK |
1040 | pte_special_tests(pte_aligned, prot); |
1041 | pte_protnone_tests(pte_aligned, protnone); | |
1042 | pmd_protnone_tests(pmd_aligned, protnone); | |
1043 | ||
1044 | pte_devmap_tests(pte_aligned, prot); | |
1045 | pmd_devmap_tests(pmd_aligned, prot); | |
1046 | pud_devmap_tests(pud_aligned, prot); | |
1047 | ||
1048 | pte_soft_dirty_tests(pte_aligned, prot); | |
1049 | pmd_soft_dirty_tests(pmd_aligned, prot); | |
1050 | pte_swap_soft_dirty_tests(pte_aligned, prot); | |
1051 | pmd_swap_soft_dirty_tests(pmd_aligned, prot); | |
1052 | ||
1053 | pte_swap_tests(pte_aligned, prot); | |
1054 | pmd_swap_tests(pmd_aligned, prot); | |
1055 | ||
1056 | swap_migration_tests(); | |
05289402 AK |
1057 | |
1058 | pmd_thp_tests(pmd_aligned, prot); | |
1059 | pud_thp_tests(pud_aligned, prot); | |
1060 | ||
e8edf0ad AK |
1061 | hugetlb_basic_tests(pte_aligned, prot); |
1062 | ||
6f302e27 AK |
1063 | /* |
1064 | * Page table modifying tests. They need to hold | |
1065 | * proper page table lock. | |
1066 | */ | |
e8edf0ad | 1067 | |
f14312e1 | 1068 | ptep = pte_offset_map_lock(mm, pmdp, vaddr, &ptl); |
401035d5 | 1069 | pte_clear_tests(mm, ptep, pte_aligned, vaddr, prot); |
e8edf0ad | 1070 | pte_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot); |
6f302e27 | 1071 | pte_unmap_unlock(ptep, ptl); |
e8edf0ad | 1072 | |
6f302e27 AK |
1073 | ptl = pmd_lock(mm, pmdp); |
1074 | pmd_clear_tests(mm, pmdp); | |
87f34986 | 1075 | pmd_advanced_tests(mm, vma, pmdp, pmd_aligned, vaddr, prot, saved_ptep); |
e8edf0ad | 1076 | pmd_huge_tests(pmdp, pmd_aligned, prot); |
6f302e27 AK |
1077 | pmd_populate_tests(mm, pmdp, saved_ptep); |
1078 | spin_unlock(ptl); | |
1079 | ||
1080 | ptl = pud_lock(mm, pudp); | |
1081 | pud_clear_tests(mm, pudp); | |
1082 | pud_advanced_tests(mm, vma, pudp, pud_aligned, vaddr, prot); | |
e8edf0ad | 1083 | pud_huge_tests(pudp, pud_aligned, prot); |
6f302e27 AK |
1084 | pud_populate_tests(mm, pudp, saved_pmdp); |
1085 | spin_unlock(ptl); | |
e8edf0ad | 1086 | |
6f302e27 AK |
1087 | spin_lock(&mm->page_table_lock); |
1088 | p4d_clear_tests(mm, p4dp); | |
1089 | pgd_clear_tests(mm, pgdp); | |
e8edf0ad AK |
1090 | p4d_populate_tests(mm, p4dp, saved_pudp); |
1091 | pgd_populate_tests(mm, pgdp, saved_p4dp); | |
6f302e27 | 1092 | spin_unlock(&mm->page_table_lock); |
e8edf0ad | 1093 | |
399145f9 AK |
1094 | p4d_free(mm, saved_p4dp); |
1095 | pud_free(mm, saved_pudp); | |
1096 | pmd_free(mm, saved_pmdp); | |
1097 | pte_free(mm, saved_ptep); | |
1098 | ||
a5c3b9ff | 1099 | vm_area_free(vma); |
399145f9 AK |
1100 | mm_dec_nr_puds(mm); |
1101 | mm_dec_nr_pmds(mm); | |
1102 | mm_dec_nr_ptes(mm); | |
1103 | mmdrop(mm); | |
1104 | return 0; | |
1105 | } | |
1106 | late_initcall(debug_vm_pgtable); |