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Commit | Line | Data |
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fa2d8369 AK |
1 | /* |
2 | * self test for change_page_attr. | |
3 | * | |
4 | * Clears the global bit on random pages in the direct mapping, then reverts | |
5 | * and compares page tables forwards and afterwards. | |
6 | */ | |
851339b1 | 7 | #include <linux/bootmem.h> |
fa2d8369 AK |
8 | #include <linux/random.h> |
9 | #include <linux/kernel.h> | |
10 | #include <linux/init.h> | |
851339b1 IM |
11 | #include <linux/mm.h> |
12 | ||
fa2d8369 AK |
13 | #include <asm/cacheflush.h> |
14 | #include <asm/pgtable.h> | |
15 | #include <asm/kdebug.h> | |
16 | ||
17 | enum { | |
86f03989 | 18 | NTEST = 4000, |
fa2d8369 | 19 | #ifdef CONFIG_X86_64 |
851339b1 | 20 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 21 | #elif defined(CONFIG_X86_PAE) |
851339b1 | 22 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 23 | #else |
851339b1 | 24 | LPS = (1 << 22), |
fa2d8369 | 25 | #endif |
851339b1 | 26 | GPS = (1<<30) |
fa2d8369 AK |
27 | }; |
28 | ||
fa2d8369 AK |
29 | struct split_state { |
30 | long lpg, gpg, spg, exec; | |
31 | long min_exec, max_exec; | |
32 | }; | |
33 | ||
34 | static __init int print_split(struct split_state *s) | |
35 | { | |
fa2d8369 | 36 | long i, expected, missed = 0; |
851339b1 | 37 | int printed = 0; |
fa2d8369 AK |
38 | int err = 0; |
39 | ||
40 | s->lpg = s->gpg = s->spg = s->exec = 0; | |
41 | s->min_exec = ~0UL; | |
42 | s->max_exec = 0; | |
f87519e8 | 43 | for (i = 0; i < max_pfn_mapped; ) { |
851339b1 | 44 | unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT); |
fa2d8369 AK |
45 | int level; |
46 | pte_t *pte; | |
fa2d8369 | 47 | |
851339b1 | 48 | pte = lookup_address(addr, &level); |
fa2d8369 AK |
49 | if (!pte) { |
50 | if (!printed) { | |
851339b1 IM |
51 | dump_pagetable(addr); |
52 | printk(KERN_INFO "CPA %lx no pte level %d\n", | |
53 | addr, level); | |
fa2d8369 AK |
54 | printed = 1; |
55 | } | |
56 | missed++; | |
57 | i++; | |
58 | continue; | |
59 | } | |
60 | ||
86f03989 | 61 | if (level == PG_LEVEL_1G && sizeof(long) == 8) { |
fa2d8369 AK |
62 | s->gpg++; |
63 | i += GPS/PAGE_SIZE; | |
86f03989 | 64 | } else if (level == PG_LEVEL_2M) { |
fa2d8369 | 65 | if (!(pte_val(*pte) & _PAGE_PSE)) { |
851339b1 IM |
66 | printk(KERN_ERR |
67 | "%lx level %d but not PSE %Lx\n", | |
68 | addr, level, (u64)pte_val(*pte)); | |
fa2d8369 AK |
69 | err = 1; |
70 | } | |
71 | s->lpg++; | |
72 | i += LPS/PAGE_SIZE; | |
73 | } else { | |
74 | s->spg++; | |
75 | i++; | |
76 | } | |
77 | if (!(pte_val(*pte) & _PAGE_NX)) { | |
78 | s->exec++; | |
851339b1 IM |
79 | if (addr < s->min_exec) |
80 | s->min_exec = addr; | |
81 | if (addr > s->max_exec) | |
82 | s->max_exec = addr; | |
fa2d8369 AK |
83 | } |
84 | } | |
851339b1 IM |
85 | printk(KERN_INFO |
86 | "CPA mapping 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n", | |
fa2d8369 AK |
87 | s->spg, s->lpg, s->gpg, s->exec, |
88 | s->min_exec != ~0UL ? s->min_exec : 0, s->max_exec, missed); | |
851339b1 | 89 | |
fa2d8369 AK |
90 | expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed; |
91 | if (expected != i) { | |
f87519e8 TG |
92 | printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n", |
93 | max_pfn_mapped, expected); | |
fa2d8369 AK |
94 | return 1; |
95 | } | |
96 | return err; | |
97 | } | |
98 | ||
851339b1 IM |
99 | static unsigned long __initdata addr[NTEST]; |
100 | static unsigned int __initdata len[NTEST]; | |
fa2d8369 AK |
101 | |
102 | /* Change the global bit on random pages in the direct mapping */ | |
103 | static __init int exercise_pageattr(void) | |
104 | { | |
851339b1 IM |
105 | struct split_state sa, sb, sc; |
106 | unsigned long *bm; | |
fa2d8369 | 107 | pte_t *pte, pte0; |
851339b1 | 108 | int failed = 0; |
fa2d8369 | 109 | int level; |
851339b1 | 110 | int i, k; |
fa2d8369 | 111 | int err; |
fa2d8369 | 112 | |
851339b1 | 113 | printk(KERN_INFO "CPA exercising pageattr\n"); |
fa2d8369 | 114 | |
f87519e8 | 115 | bm = vmalloc((max_pfn_mapped + 7) / 8); |
fa2d8369 | 116 | if (!bm) { |
851339b1 | 117 | printk(KERN_ERR "CPA Cannot vmalloc bitmap\n"); |
fa2d8369 AK |
118 | return -ENOMEM; |
119 | } | |
f87519e8 | 120 | memset(bm, 0, (max_pfn_mapped + 7) / 8); |
fa2d8369 AK |
121 | |
122 | failed += print_split(&sa); | |
123 | srandom32(100); | |
851339b1 | 124 | |
fa2d8369 | 125 | for (i = 0; i < NTEST; i++) { |
f87519e8 | 126 | unsigned long pfn = random32() % max_pfn_mapped; |
851339b1 | 127 | |
fa2d8369 AK |
128 | addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT); |
129 | len[i] = random32() % 100; | |
f87519e8 | 130 | len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1); |
851339b1 | 131 | |
fa2d8369 AK |
132 | if (len[i] == 0) |
133 | len[i] = 1; | |
134 | ||
135 | pte = NULL; | |
136 | pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */ | |
851339b1 | 137 | |
fa2d8369 AK |
138 | for (k = 0; k < len[i]; k++) { |
139 | pte = lookup_address(addr[i] + k*PAGE_SIZE, &level); | |
140 | if (!pte || pgprot_val(pte_pgprot(*pte)) == 0) { | |
141 | addr[i] = 0; | |
142 | break; | |
143 | } | |
851339b1 | 144 | if (k == 0) { |
fa2d8369 | 145 | pte0 = *pte; |
851339b1 IM |
146 | } else { |
147 | if (pgprot_val(pte_pgprot(*pte)) != | |
fa2d8369 | 148 | pgprot_val(pte_pgprot(pte0))) { |
851339b1 IM |
149 | len[i] = k; |
150 | break; | |
151 | } | |
fa2d8369 AK |
152 | } |
153 | if (test_bit(pfn + k, bm)) { | |
154 | len[i] = k; | |
155 | break; | |
156 | } | |
157 | __set_bit(pfn + k, bm); | |
158 | } | |
159 | if (!addr[i] || !pte || !k) { | |
160 | addr[i] = 0; | |
161 | continue; | |
162 | } | |
163 | ||
86f03989 | 164 | err = change_page_attr_clear(addr[i], len[i], |
72932c7a | 165 | __pgprot(_PAGE_GLOBAL)); |
fa2d8369 | 166 | if (err < 0) { |
851339b1 | 167 | printk(KERN_ERR "CPA %d failed %d\n", i, err); |
fa2d8369 AK |
168 | failed++; |
169 | } | |
170 | ||
171 | pte = lookup_address(addr[i], &level); | |
172 | if (!pte || pte_global(*pte) || pte_huge(*pte)) { | |
851339b1 | 173 | printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i], |
fa2d8369 AK |
174 | pte ? (u64)pte_val(*pte) : 0ULL); |
175 | failed++; | |
176 | } | |
86f03989 | 177 | if (level != PG_LEVEL_4K) { |
851339b1 IM |
178 | printk(KERN_ERR "CPA %lx: unexpected level %d\n", |
179 | addr[i], level); | |
fa2d8369 AK |
180 | failed++; |
181 | } | |
182 | ||
183 | } | |
184 | vfree(bm); | |
fa2d8369 AK |
185 | |
186 | failed += print_split(&sb); | |
187 | ||
851339b1 | 188 | printk(KERN_INFO "CPA reverting everything\n"); |
fa2d8369 AK |
189 | for (i = 0; i < NTEST; i++) { |
190 | if (!addr[i]) | |
191 | continue; | |
192 | pte = lookup_address(addr[i], &level); | |
193 | if (!pte) { | |
851339b1 | 194 | printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]); |
fa2d8369 AK |
195 | failed++; |
196 | continue; | |
197 | } | |
86f03989 | 198 | err = change_page_attr_set(addr[i], len[i], |
72932c7a | 199 | __pgprot(_PAGE_GLOBAL)); |
fa2d8369 | 200 | if (err < 0) { |
851339b1 | 201 | printk(KERN_ERR "CPA reverting failed: %d\n", err); |
fa2d8369 AK |
202 | failed++; |
203 | } | |
204 | pte = lookup_address(addr[i], &level); | |
205 | if (!pte || !pte_global(*pte)) { | |
851339b1 IM |
206 | printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n", |
207 | addr[i], pte ? (u64)pte_val(*pte) : 0ULL); | |
fa2d8369 AK |
208 | failed++; |
209 | } | |
210 | ||
211 | } | |
fa2d8369 AK |
212 | |
213 | failed += print_split(&sc); | |
fa2d8369 | 214 | |
55ce29ba | 215 | if (failed) { |
851339b1 | 216 | printk(KERN_ERR "CPA selftests NOT PASSED. Please report.\n"); |
55ce29ba IM |
217 | WARN_ON(1); |
218 | } else { | |
851339b1 | 219 | printk(KERN_INFO "CPA selftests PASSED\n"); |
55ce29ba | 220 | } |
fa2d8369 AK |
221 | |
222 | return 0; | |
223 | } | |
fa2d8369 | 224 | module_init(exercise_pageattr); |