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> |
971a52d6 | 8 | #include <linux/kthread.h> |
fa2d8369 AK |
9 | #include <linux/random.h> |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
851339b1 IM |
12 | #include <linux/mm.h> |
13 | ||
fa2d8369 AK |
14 | #include <asm/cacheflush.h> |
15 | #include <asm/pgtable.h> | |
16 | #include <asm/kdebug.h> | |
17 | ||
971a52d6 IM |
18 | /* |
19 | * Only print the results of the first pass: | |
20 | */ | |
21 | static __read_mostly int print = 1; | |
22 | ||
fa2d8369 | 23 | enum { |
971a52d6 | 24 | NTEST = 400, |
fa2d8369 | 25 | #ifdef CONFIG_X86_64 |
851339b1 | 26 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 27 | #elif defined(CONFIG_X86_PAE) |
851339b1 | 28 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 29 | #else |
851339b1 | 30 | LPS = (1 << 22), |
fa2d8369 | 31 | #endif |
851339b1 | 32 | GPS = (1<<30) |
fa2d8369 AK |
33 | }; |
34 | ||
fa2d8369 AK |
35 | struct split_state { |
36 | long lpg, gpg, spg, exec; | |
37 | long min_exec, max_exec; | |
38 | }; | |
39 | ||
971a52d6 | 40 | static int print_split(struct split_state *s) |
fa2d8369 | 41 | { |
fa2d8369 AK |
42 | long i, expected, missed = 0; |
43 | int err = 0; | |
44 | ||
45 | s->lpg = s->gpg = s->spg = s->exec = 0; | |
46 | s->min_exec = ~0UL; | |
47 | s->max_exec = 0; | |
f87519e8 | 48 | for (i = 0; i < max_pfn_mapped; ) { |
851339b1 | 49 | unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT); |
93809be8 | 50 | unsigned int level; |
fa2d8369 | 51 | pte_t *pte; |
fa2d8369 | 52 | |
851339b1 | 53 | pte = lookup_address(addr, &level); |
fa2d8369 | 54 | if (!pte) { |
fa2d8369 AK |
55 | missed++; |
56 | i++; | |
57 | continue; | |
58 | } | |
59 | ||
86f03989 | 60 | if (level == PG_LEVEL_1G && sizeof(long) == 8) { |
fa2d8369 AK |
61 | s->gpg++; |
62 | i += GPS/PAGE_SIZE; | |
86f03989 | 63 | } else if (level == PG_LEVEL_2M) { |
fa2d8369 | 64 | if (!(pte_val(*pte) & _PAGE_PSE)) { |
851339b1 IM |
65 | printk(KERN_ERR |
66 | "%lx level %d but not PSE %Lx\n", | |
67 | addr, level, (u64)pte_val(*pte)); | |
fa2d8369 AK |
68 | err = 1; |
69 | } | |
70 | s->lpg++; | |
71 | i += LPS/PAGE_SIZE; | |
72 | } else { | |
73 | s->spg++; | |
74 | i++; | |
75 | } | |
76 | if (!(pte_val(*pte) & _PAGE_NX)) { | |
77 | s->exec++; | |
851339b1 IM |
78 | if (addr < s->min_exec) |
79 | s->min_exec = addr; | |
80 | if (addr > s->max_exec) | |
81 | s->max_exec = addr; | |
fa2d8369 AK |
82 | } |
83 | } | |
971a52d6 IM |
84 | if (print) { |
85 | printk(KERN_INFO | |
86 | " 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n", | |
87 | s->spg, s->lpg, s->gpg, s->exec, | |
88 | s->min_exec != ~0UL ? s->min_exec : 0, | |
89 | s->max_exec, missed); | |
90 | } | |
851339b1 | 91 | |
fa2d8369 AK |
92 | expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed; |
93 | if (expected != i) { | |
f87519e8 TG |
94 | printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n", |
95 | max_pfn_mapped, expected); | |
fa2d8369 AK |
96 | return 1; |
97 | } | |
98 | return err; | |
99 | } | |
100 | ||
971a52d6 IM |
101 | static unsigned long addr[NTEST]; |
102 | static unsigned int len[NTEST]; | |
fa2d8369 AK |
103 | |
104 | /* Change the global bit on random pages in the direct mapping */ | |
971a52d6 | 105 | static int pageattr_test(void) |
fa2d8369 | 106 | { |
851339b1 IM |
107 | struct split_state sa, sb, sc; |
108 | unsigned long *bm; | |
fa2d8369 | 109 | pte_t *pte, pte0; |
851339b1 | 110 | int failed = 0; |
93809be8 | 111 | unsigned int level; |
851339b1 | 112 | int i, k; |
fa2d8369 | 113 | int err; |
fa2d8369 | 114 | |
971a52d6 IM |
115 | if (print) |
116 | printk(KERN_INFO "CPA self-test:\n"); | |
fa2d8369 | 117 | |
f87519e8 | 118 | bm = vmalloc((max_pfn_mapped + 7) / 8); |
fa2d8369 | 119 | if (!bm) { |
851339b1 | 120 | printk(KERN_ERR "CPA Cannot vmalloc bitmap\n"); |
fa2d8369 AK |
121 | return -ENOMEM; |
122 | } | |
f87519e8 | 123 | memset(bm, 0, (max_pfn_mapped + 7) / 8); |
fa2d8369 AK |
124 | |
125 | failed += print_split(&sa); | |
126 | srandom32(100); | |
851339b1 | 127 | |
fa2d8369 | 128 | for (i = 0; i < NTEST; i++) { |
f87519e8 | 129 | unsigned long pfn = random32() % max_pfn_mapped; |
851339b1 | 130 | |
fa2d8369 AK |
131 | addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT); |
132 | len[i] = random32() % 100; | |
f87519e8 | 133 | len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1); |
851339b1 | 134 | |
fa2d8369 AK |
135 | if (len[i] == 0) |
136 | len[i] = 1; | |
137 | ||
138 | pte = NULL; | |
139 | pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */ | |
851339b1 | 140 | |
fa2d8369 AK |
141 | for (k = 0; k < len[i]; k++) { |
142 | pte = lookup_address(addr[i] + k*PAGE_SIZE, &level); | |
64f351d1 TG |
143 | if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 || |
144 | !(pte_val(*pte) & _PAGE_PRESENT)) { | |
fa2d8369 AK |
145 | addr[i] = 0; |
146 | break; | |
147 | } | |
851339b1 | 148 | if (k == 0) { |
fa2d8369 | 149 | pte0 = *pte; |
851339b1 IM |
150 | } else { |
151 | if (pgprot_val(pte_pgprot(*pte)) != | |
fa2d8369 | 152 | pgprot_val(pte_pgprot(pte0))) { |
851339b1 IM |
153 | len[i] = k; |
154 | break; | |
155 | } | |
fa2d8369 AK |
156 | } |
157 | if (test_bit(pfn + k, bm)) { | |
158 | len[i] = k; | |
159 | break; | |
160 | } | |
161 | __set_bit(pfn + k, bm); | |
162 | } | |
163 | if (!addr[i] || !pte || !k) { | |
164 | addr[i] = 0; | |
165 | continue; | |
166 | } | |
167 | ||
86f03989 | 168 | err = change_page_attr_clear(addr[i], len[i], |
72932c7a | 169 | __pgprot(_PAGE_GLOBAL)); |
fa2d8369 | 170 | if (err < 0) { |
851339b1 | 171 | printk(KERN_ERR "CPA %d failed %d\n", i, err); |
fa2d8369 AK |
172 | failed++; |
173 | } | |
174 | ||
175 | pte = lookup_address(addr[i], &level); | |
176 | if (!pte || pte_global(*pte) || pte_huge(*pte)) { | |
851339b1 | 177 | printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i], |
fa2d8369 AK |
178 | pte ? (u64)pte_val(*pte) : 0ULL); |
179 | failed++; | |
180 | } | |
86f03989 | 181 | if (level != PG_LEVEL_4K) { |
851339b1 IM |
182 | printk(KERN_ERR "CPA %lx: unexpected level %d\n", |
183 | addr[i], level); | |
fa2d8369 AK |
184 | failed++; |
185 | } | |
186 | ||
187 | } | |
188 | vfree(bm); | |
fa2d8369 AK |
189 | |
190 | failed += print_split(&sb); | |
191 | ||
fa2d8369 AK |
192 | for (i = 0; i < NTEST; i++) { |
193 | if (!addr[i]) | |
194 | continue; | |
195 | pte = lookup_address(addr[i], &level); | |
196 | if (!pte) { | |
851339b1 | 197 | printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]); |
fa2d8369 AK |
198 | failed++; |
199 | continue; | |
200 | } | |
86f03989 | 201 | err = change_page_attr_set(addr[i], len[i], |
72932c7a | 202 | __pgprot(_PAGE_GLOBAL)); |
fa2d8369 | 203 | if (err < 0) { |
851339b1 | 204 | printk(KERN_ERR "CPA reverting failed: %d\n", err); |
fa2d8369 AK |
205 | failed++; |
206 | } | |
207 | pte = lookup_address(addr[i], &level); | |
208 | if (!pte || !pte_global(*pte)) { | |
851339b1 IM |
209 | printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n", |
210 | addr[i], pte ? (u64)pte_val(*pte) : 0ULL); | |
fa2d8369 AK |
211 | failed++; |
212 | } | |
213 | ||
214 | } | |
fa2d8369 AK |
215 | |
216 | failed += print_split(&sc); | |
fa2d8369 | 217 | |
55ce29ba | 218 | if (failed) { |
971a52d6 | 219 | printk(KERN_ERR "NOT PASSED. Please report.\n"); |
55ce29ba | 220 | WARN_ON(1); |
971a52d6 | 221 | return -EINVAL; |
55ce29ba | 222 | } else { |
971a52d6 IM |
223 | if (print) |
224 | printk(KERN_INFO "ok.\n"); | |
55ce29ba | 225 | } |
fa2d8369 AK |
226 | |
227 | return 0; | |
228 | } | |
971a52d6 IM |
229 | |
230 | static int do_pageattr_test(void *__unused) | |
231 | { | |
232 | while (!kthread_should_stop()) { | |
233 | schedule_timeout_interruptible(HZ*30); | |
234 | if (pageattr_test() < 0) | |
235 | break; | |
236 | if (print) | |
237 | print--; | |
238 | } | |
239 | return 0; | |
240 | } | |
241 | ||
242 | static int start_pageattr_test(void) | |
243 | { | |
244 | struct task_struct *p; | |
245 | ||
246 | p = kthread_create(do_pageattr_test, NULL, "pageattr-test"); | |
247 | if (!IS_ERR(p)) | |
248 | wake_up_process(p); | |
249 | else | |
250 | WARN_ON(1); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | module_init(start_pageattr_test); |