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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 { | |
851339b1 | 18 | NTEST = 400, |
30551bb3 | 19 | LOWEST_LEVEL = PG_LEVEL_4K, |
fa2d8369 | 20 | #ifdef CONFIG_X86_64 |
851339b1 | 21 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 22 | #elif defined(CONFIG_X86_PAE) |
851339b1 | 23 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 24 | #else |
851339b1 | 25 | LPS = (1 << 22), |
fa2d8369 | 26 | #endif |
851339b1 | 27 | GPS = (1<<30) |
fa2d8369 AK |
28 | }; |
29 | ||
fa2d8369 AK |
30 | struct split_state { |
31 | long lpg, gpg, spg, exec; | |
32 | long min_exec, max_exec; | |
33 | }; | |
34 | ||
35 | static __init int print_split(struct split_state *s) | |
36 | { | |
fa2d8369 | 37 | long i, expected, missed = 0; |
851339b1 | 38 | int printed = 0; |
fa2d8369 AK |
39 | int err = 0; |
40 | ||
41 | s->lpg = s->gpg = s->spg = s->exec = 0; | |
42 | s->min_exec = ~0UL; | |
43 | s->max_exec = 0; | |
f87519e8 | 44 | for (i = 0; i < max_pfn_mapped; ) { |
851339b1 | 45 | unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT); |
fa2d8369 AK |
46 | int level; |
47 | pte_t *pte; | |
fa2d8369 | 48 | |
851339b1 | 49 | pte = lookup_address(addr, &level); |
fa2d8369 AK |
50 | if (!pte) { |
51 | if (!printed) { | |
851339b1 IM |
52 | dump_pagetable(addr); |
53 | printk(KERN_INFO "CPA %lx no pte level %d\n", | |
54 | addr, level); | |
fa2d8369 AK |
55 | printed = 1; |
56 | } | |
57 | missed++; | |
58 | i++; | |
59 | continue; | |
60 | } | |
61 | ||
62 | if (level == 2 && sizeof(long) == 8) { | |
63 | s->gpg++; | |
64 | i += GPS/PAGE_SIZE; | |
65 | } else if (level != LOWEST_LEVEL) { | |
66 | if (!(pte_val(*pte) & _PAGE_PSE)) { | |
851339b1 IM |
67 | printk(KERN_ERR |
68 | "%lx level %d but not PSE %Lx\n", | |
69 | addr, level, (u64)pte_val(*pte)); | |
fa2d8369 AK |
70 | err = 1; |
71 | } | |
72 | s->lpg++; | |
73 | i += LPS/PAGE_SIZE; | |
74 | } else { | |
75 | s->spg++; | |
76 | i++; | |
77 | } | |
78 | if (!(pte_val(*pte) & _PAGE_NX)) { | |
79 | s->exec++; | |
851339b1 IM |
80 | if (addr < s->min_exec) |
81 | s->min_exec = addr; | |
82 | if (addr > s->max_exec) | |
83 | s->max_exec = addr; | |
fa2d8369 AK |
84 | } |
85 | } | |
851339b1 IM |
86 | printk(KERN_INFO |
87 | "CPA mapping 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n", | |
fa2d8369 AK |
88 | s->spg, s->lpg, s->gpg, s->exec, |
89 | s->min_exec != ~0UL ? s->min_exec : 0, s->max_exec, missed); | |
851339b1 | 90 | |
fa2d8369 AK |
91 | expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed; |
92 | if (expected != i) { | |
f87519e8 TG |
93 | printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n", |
94 | max_pfn_mapped, expected); | |
fa2d8369 AK |
95 | return 1; |
96 | } | |
97 | return err; | |
98 | } | |
99 | ||
851339b1 IM |
100 | static unsigned long __initdata addr[NTEST]; |
101 | static unsigned int __initdata len[NTEST]; | |
fa2d8369 AK |
102 | |
103 | /* Change the global bit on random pages in the direct mapping */ | |
104 | static __init int exercise_pageattr(void) | |
105 | { | |
851339b1 IM |
106 | struct split_state sa, sb, sc; |
107 | unsigned long *bm; | |
fa2d8369 | 108 | pte_t *pte, pte0; |
851339b1 | 109 | int failed = 0; |
fa2d8369 | 110 | int level; |
851339b1 | 111 | int i, k; |
fa2d8369 | 112 | int err; |
fa2d8369 | 113 | |
851339b1 | 114 | printk(KERN_INFO "CPA exercising pageattr\n"); |
fa2d8369 | 115 | |
f87519e8 | 116 | bm = vmalloc((max_pfn_mapped + 7) / 8); |
fa2d8369 | 117 | if (!bm) { |
851339b1 | 118 | printk(KERN_ERR "CPA Cannot vmalloc bitmap\n"); |
fa2d8369 AK |
119 | return -ENOMEM; |
120 | } | |
f87519e8 | 121 | memset(bm, 0, (max_pfn_mapped + 7) / 8); |
fa2d8369 AK |
122 | |
123 | failed += print_split(&sa); | |
124 | srandom32(100); | |
851339b1 | 125 | |
fa2d8369 | 126 | for (i = 0; i < NTEST; i++) { |
f87519e8 | 127 | unsigned long pfn = random32() % max_pfn_mapped; |
851339b1 | 128 | |
fa2d8369 AK |
129 | addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT); |
130 | len[i] = random32() % 100; | |
f87519e8 | 131 | len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1); |
851339b1 | 132 | |
fa2d8369 AK |
133 | if (len[i] == 0) |
134 | len[i] = 1; | |
135 | ||
136 | pte = NULL; | |
137 | pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */ | |
851339b1 | 138 | |
fa2d8369 AK |
139 | for (k = 0; k < len[i]; k++) { |
140 | pte = lookup_address(addr[i] + k*PAGE_SIZE, &level); | |
141 | if (!pte || pgprot_val(pte_pgprot(*pte)) == 0) { | |
142 | addr[i] = 0; | |
143 | break; | |
144 | } | |
851339b1 | 145 | if (k == 0) { |
fa2d8369 | 146 | pte0 = *pte; |
851339b1 IM |
147 | } else { |
148 | if (pgprot_val(pte_pgprot(*pte)) != | |
fa2d8369 | 149 | pgprot_val(pte_pgprot(pte0))) { |
851339b1 IM |
150 | len[i] = k; |
151 | break; | |
152 | } | |
fa2d8369 AK |
153 | } |
154 | if (test_bit(pfn + k, bm)) { | |
155 | len[i] = k; | |
156 | break; | |
157 | } | |
158 | __set_bit(pfn + k, bm); | |
159 | } | |
160 | if (!addr[i] || !pte || !k) { | |
161 | addr[i] = 0; | |
162 | continue; | |
163 | } | |
164 | ||
72932c7a TG |
165 | err = __change_page_attr_clear(addr[i], len[i], |
166 | __pgprot(_PAGE_GLOBAL)); | |
fa2d8369 | 167 | if (err < 0) { |
851339b1 | 168 | printk(KERN_ERR "CPA %d failed %d\n", i, err); |
fa2d8369 AK |
169 | failed++; |
170 | } | |
171 | ||
172 | pte = lookup_address(addr[i], &level); | |
173 | if (!pte || pte_global(*pte) || pte_huge(*pte)) { | |
851339b1 | 174 | printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i], |
fa2d8369 AK |
175 | pte ? (u64)pte_val(*pte) : 0ULL); |
176 | failed++; | |
177 | } | |
178 | if (level != LOWEST_LEVEL) { | |
851339b1 IM |
179 | printk(KERN_ERR "CPA %lx: unexpected level %d\n", |
180 | addr[i], level); | |
fa2d8369 AK |
181 | failed++; |
182 | } | |
183 | ||
184 | } | |
185 | vfree(bm); | |
af1e6844 | 186 | cpa_flush_all(); |
fa2d8369 AK |
187 | |
188 | failed += print_split(&sb); | |
189 | ||
851339b1 | 190 | printk(KERN_INFO "CPA reverting everything\n"); |
fa2d8369 AK |
191 | for (i = 0; i < NTEST; i++) { |
192 | if (!addr[i]) | |
193 | continue; | |
194 | pte = lookup_address(addr[i], &level); | |
195 | if (!pte) { | |
851339b1 | 196 | printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]); |
fa2d8369 AK |
197 | failed++; |
198 | continue; | |
199 | } | |
72932c7a TG |
200 | err = __change_page_attr_set(addr[i], len[i], |
201 | __pgprot(_PAGE_GLOBAL)); | |
fa2d8369 | 202 | if (err < 0) { |
851339b1 | 203 | printk(KERN_ERR "CPA reverting failed: %d\n", err); |
fa2d8369 AK |
204 | failed++; |
205 | } | |
206 | pte = lookup_address(addr[i], &level); | |
207 | if (!pte || !pte_global(*pte)) { | |
851339b1 IM |
208 | printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n", |
209 | addr[i], pte ? (u64)pte_val(*pte) : 0ULL); | |
fa2d8369 AK |
210 | failed++; |
211 | } | |
212 | ||
213 | } | |
af1e6844 | 214 | cpa_flush_all(); |
fa2d8369 AK |
215 | |
216 | failed += print_split(&sc); | |
fa2d8369 | 217 | |
55ce29ba | 218 | if (failed) { |
851339b1 | 219 | printk(KERN_ERR "CPA selftests NOT PASSED. Please report.\n"); |
55ce29ba IM |
220 | WARN_ON(1); |
221 | } else { | |
851339b1 | 222 | printk(KERN_INFO "CPA selftests PASSED\n"); |
55ce29ba | 223 | } |
fa2d8369 AK |
224 | |
225 | return 0; | |
226 | } | |
fa2d8369 | 227 | module_init(exercise_pageattr); |