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 | 42 | long i, expected, missed = 0; |
851339b1 | 43 | int printed = 0; |
fa2d8369 AK |
44 | int err = 0; |
45 | ||
46 | s->lpg = s->gpg = s->spg = s->exec = 0; | |
47 | s->min_exec = ~0UL; | |
48 | s->max_exec = 0; | |
f87519e8 | 49 | for (i = 0; i < max_pfn_mapped; ) { |
851339b1 | 50 | unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT); |
93809be8 | 51 | unsigned int level; |
fa2d8369 | 52 | pte_t *pte; |
fa2d8369 | 53 | |
851339b1 | 54 | pte = lookup_address(addr, &level); |
fa2d8369 AK |
55 | if (!pte) { |
56 | if (!printed) { | |
851339b1 IM |
57 | dump_pagetable(addr); |
58 | printk(KERN_INFO "CPA %lx no pte level %d\n", | |
59 | addr, level); | |
fa2d8369 AK |
60 | printed = 1; |
61 | } | |
62 | missed++; | |
63 | i++; | |
64 | continue; | |
65 | } | |
66 | ||
86f03989 | 67 | if (level == PG_LEVEL_1G && sizeof(long) == 8) { |
fa2d8369 AK |
68 | s->gpg++; |
69 | i += GPS/PAGE_SIZE; | |
86f03989 | 70 | } else if (level == PG_LEVEL_2M) { |
fa2d8369 | 71 | if (!(pte_val(*pte) & _PAGE_PSE)) { |
851339b1 IM |
72 | printk(KERN_ERR |
73 | "%lx level %d but not PSE %Lx\n", | |
74 | addr, level, (u64)pte_val(*pte)); | |
fa2d8369 AK |
75 | err = 1; |
76 | } | |
77 | s->lpg++; | |
78 | i += LPS/PAGE_SIZE; | |
79 | } else { | |
80 | s->spg++; | |
81 | i++; | |
82 | } | |
83 | if (!(pte_val(*pte) & _PAGE_NX)) { | |
84 | s->exec++; | |
851339b1 IM |
85 | if (addr < s->min_exec) |
86 | s->min_exec = addr; | |
87 | if (addr > s->max_exec) | |
88 | s->max_exec = addr; | |
fa2d8369 AK |
89 | } |
90 | } | |
971a52d6 IM |
91 | if (print) { |
92 | printk(KERN_INFO | |
93 | " 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n", | |
94 | s->spg, s->lpg, s->gpg, s->exec, | |
95 | s->min_exec != ~0UL ? s->min_exec : 0, | |
96 | s->max_exec, missed); | |
97 | } | |
851339b1 | 98 | |
fa2d8369 AK |
99 | expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed; |
100 | if (expected != i) { | |
f87519e8 TG |
101 | printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n", |
102 | max_pfn_mapped, expected); | |
fa2d8369 AK |
103 | return 1; |
104 | } | |
105 | return err; | |
106 | } | |
107 | ||
971a52d6 IM |
108 | static unsigned long addr[NTEST]; |
109 | static unsigned int len[NTEST]; | |
fa2d8369 AK |
110 | |
111 | /* Change the global bit on random pages in the direct mapping */ | |
971a52d6 | 112 | static int pageattr_test(void) |
fa2d8369 | 113 | { |
851339b1 IM |
114 | struct split_state sa, sb, sc; |
115 | unsigned long *bm; | |
fa2d8369 | 116 | pte_t *pte, pte0; |
851339b1 | 117 | int failed = 0; |
93809be8 | 118 | unsigned int level; |
851339b1 | 119 | int i, k; |
fa2d8369 | 120 | int err; |
fa2d8369 | 121 | |
971a52d6 IM |
122 | if (print) |
123 | printk(KERN_INFO "CPA self-test:\n"); | |
fa2d8369 | 124 | |
f87519e8 | 125 | bm = vmalloc((max_pfn_mapped + 7) / 8); |
fa2d8369 | 126 | if (!bm) { |
851339b1 | 127 | printk(KERN_ERR "CPA Cannot vmalloc bitmap\n"); |
fa2d8369 AK |
128 | return -ENOMEM; |
129 | } | |
f87519e8 | 130 | memset(bm, 0, (max_pfn_mapped + 7) / 8); |
fa2d8369 AK |
131 | |
132 | failed += print_split(&sa); | |
133 | srandom32(100); | |
851339b1 | 134 | |
fa2d8369 | 135 | for (i = 0; i < NTEST; i++) { |
f87519e8 | 136 | unsigned long pfn = random32() % max_pfn_mapped; |
851339b1 | 137 | |
fa2d8369 AK |
138 | addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT); |
139 | len[i] = random32() % 100; | |
f87519e8 | 140 | len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1); |
851339b1 | 141 | |
fa2d8369 AK |
142 | if (len[i] == 0) |
143 | len[i] = 1; | |
144 | ||
145 | pte = NULL; | |
146 | pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */ | |
851339b1 | 147 | |
fa2d8369 AK |
148 | for (k = 0; k < len[i]; k++) { |
149 | pte = lookup_address(addr[i] + k*PAGE_SIZE, &level); | |
64f351d1 TG |
150 | if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 || |
151 | !(pte_val(*pte) & _PAGE_PRESENT)) { | |
fa2d8369 AK |
152 | addr[i] = 0; |
153 | break; | |
154 | } | |
851339b1 | 155 | if (k == 0) { |
fa2d8369 | 156 | pte0 = *pte; |
851339b1 IM |
157 | } else { |
158 | if (pgprot_val(pte_pgprot(*pte)) != | |
fa2d8369 | 159 | pgprot_val(pte_pgprot(pte0))) { |
851339b1 IM |
160 | len[i] = k; |
161 | break; | |
162 | } | |
fa2d8369 AK |
163 | } |
164 | if (test_bit(pfn + k, bm)) { | |
165 | len[i] = k; | |
166 | break; | |
167 | } | |
168 | __set_bit(pfn + k, bm); | |
169 | } | |
170 | if (!addr[i] || !pte || !k) { | |
171 | addr[i] = 0; | |
172 | continue; | |
173 | } | |
174 | ||
86f03989 | 175 | err = change_page_attr_clear(addr[i], len[i], |
72932c7a | 176 | __pgprot(_PAGE_GLOBAL)); |
fa2d8369 | 177 | if (err < 0) { |
851339b1 | 178 | printk(KERN_ERR "CPA %d failed %d\n", i, err); |
fa2d8369 AK |
179 | failed++; |
180 | } | |
181 | ||
182 | pte = lookup_address(addr[i], &level); | |
183 | if (!pte || pte_global(*pte) || pte_huge(*pte)) { | |
851339b1 | 184 | printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i], |
fa2d8369 AK |
185 | pte ? (u64)pte_val(*pte) : 0ULL); |
186 | failed++; | |
187 | } | |
86f03989 | 188 | if (level != PG_LEVEL_4K) { |
851339b1 IM |
189 | printk(KERN_ERR "CPA %lx: unexpected level %d\n", |
190 | addr[i], level); | |
fa2d8369 AK |
191 | failed++; |
192 | } | |
193 | ||
194 | } | |
195 | vfree(bm); | |
fa2d8369 AK |
196 | |
197 | failed += print_split(&sb); | |
198 | ||
fa2d8369 AK |
199 | for (i = 0; i < NTEST; i++) { |
200 | if (!addr[i]) | |
201 | continue; | |
202 | pte = lookup_address(addr[i], &level); | |
203 | if (!pte) { | |
851339b1 | 204 | printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]); |
fa2d8369 AK |
205 | failed++; |
206 | continue; | |
207 | } | |
86f03989 | 208 | err = change_page_attr_set(addr[i], len[i], |
72932c7a | 209 | __pgprot(_PAGE_GLOBAL)); |
fa2d8369 | 210 | if (err < 0) { |
851339b1 | 211 | printk(KERN_ERR "CPA reverting failed: %d\n", err); |
fa2d8369 AK |
212 | failed++; |
213 | } | |
214 | pte = lookup_address(addr[i], &level); | |
215 | if (!pte || !pte_global(*pte)) { | |
851339b1 IM |
216 | printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n", |
217 | addr[i], pte ? (u64)pte_val(*pte) : 0ULL); | |
fa2d8369 AK |
218 | failed++; |
219 | } | |
220 | ||
221 | } | |
fa2d8369 AK |
222 | |
223 | failed += print_split(&sc); | |
fa2d8369 | 224 | |
55ce29ba | 225 | if (failed) { |
971a52d6 | 226 | printk(KERN_ERR "NOT PASSED. Please report.\n"); |
55ce29ba | 227 | WARN_ON(1); |
971a52d6 | 228 | return -EINVAL; |
55ce29ba | 229 | } else { |
971a52d6 IM |
230 | if (print) |
231 | printk(KERN_INFO "ok.\n"); | |
55ce29ba | 232 | } |
fa2d8369 AK |
233 | |
234 | return 0; | |
235 | } | |
971a52d6 IM |
236 | |
237 | static int do_pageattr_test(void *__unused) | |
238 | { | |
239 | while (!kthread_should_stop()) { | |
240 | schedule_timeout_interruptible(HZ*30); | |
241 | if (pageattr_test() < 0) | |
242 | break; | |
243 | if (print) | |
244 | print--; | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
249 | static int start_pageattr_test(void) | |
250 | { | |
251 | struct task_struct *p; | |
252 | ||
253 | p = kthread_create(do_pageattr_test, NULL, "pageattr-test"); | |
254 | if (!IS_ERR(p)) | |
255 | wake_up_process(p); | |
256 | else | |
257 | WARN_ON(1); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | module_init(start_pageattr_test); |