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Commit | Line | Data |
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fa2d8369 AK |
1 | /* |
2 | * self test for change_page_attr. | |
3 | * | |
5a654ba7 JF |
4 | * Clears the a test pte bit on random pages in the direct mapping, |
5 | * then reverts and compares page tables forwards and afterwards. | |
fa2d8369 | 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> | |
8f45fe44 | 11 | #include <linux/init.h> |
851339b1 | 12 | #include <linux/mm.h> |
d6472302 | 13 | #include <linux/vmalloc.h> |
851339b1 | 14 | |
fa2d8369 AK |
15 | #include <asm/cacheflush.h> |
16 | #include <asm/pgtable.h> | |
17 | #include <asm/kdebug.h> | |
18 | ||
971a52d6 IM |
19 | /* |
20 | * Only print the results of the first pass: | |
21 | */ | |
22 | static __read_mostly int print = 1; | |
23 | ||
fa2d8369 | 24 | enum { |
971a52d6 | 25 | NTEST = 400, |
fa2d8369 | 26 | #ifdef CONFIG_X86_64 |
851339b1 | 27 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 28 | #elif defined(CONFIG_X86_PAE) |
851339b1 | 29 | LPS = (1 << PMD_SHIFT), |
fa2d8369 | 30 | #else |
851339b1 | 31 | LPS = (1 << 22), |
fa2d8369 | 32 | #endif |
851339b1 | 33 | GPS = (1<<30) |
fa2d8369 AK |
34 | }; |
35 | ||
110e0358 | 36 | #define PAGE_CPA_TEST __pgprot(_PAGE_CPA_TEST) |
5a654ba7 JF |
37 | |
38 | static int pte_testbit(pte_t pte) | |
39 | { | |
c46a7c81 | 40 | return pte_flags(pte) & _PAGE_SOFTW1; |
5a654ba7 JF |
41 | } |
42 | ||
fa2d8369 AK |
43 | struct split_state { |
44 | long lpg, gpg, spg, exec; | |
45 | long min_exec, max_exec; | |
46 | }; | |
47 | ||
971a52d6 | 48 | static int print_split(struct split_state *s) |
fa2d8369 | 49 | { |
fa2d8369 AK |
50 | long i, expected, missed = 0; |
51 | int err = 0; | |
52 | ||
53 | s->lpg = s->gpg = s->spg = s->exec = 0; | |
54 | s->min_exec = ~0UL; | |
55 | s->max_exec = 0; | |
f87519e8 | 56 | for (i = 0; i < max_pfn_mapped; ) { |
851339b1 | 57 | unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT); |
93809be8 | 58 | unsigned int level; |
fa2d8369 | 59 | pte_t *pte; |
fa2d8369 | 60 | |
851339b1 | 61 | pte = lookup_address(addr, &level); |
fa2d8369 | 62 | if (!pte) { |
fa2d8369 AK |
63 | missed++; |
64 | i++; | |
65 | continue; | |
66 | } | |
67 | ||
86f03989 | 68 | if (level == PG_LEVEL_1G && sizeof(long) == 8) { |
fa2d8369 AK |
69 | s->gpg++; |
70 | i += GPS/PAGE_SIZE; | |
86f03989 | 71 | } else if (level == PG_LEVEL_2M) { |
18699739 | 72 | if ((pte_val(*pte) & _PAGE_PRESENT) && !(pte_val(*pte) & _PAGE_PSE)) { |
851339b1 IM |
73 | printk(KERN_ERR |
74 | "%lx level %d but not PSE %Lx\n", | |
75 | addr, level, (u64)pte_val(*pte)); | |
fa2d8369 AK |
76 | err = 1; |
77 | } | |
78 | s->lpg++; | |
79 | i += LPS/PAGE_SIZE; | |
80 | } else { | |
81 | s->spg++; | |
82 | i++; | |
83 | } | |
84 | if (!(pte_val(*pte) & _PAGE_NX)) { | |
85 | s->exec++; | |
851339b1 IM |
86 | if (addr < s->min_exec) |
87 | s->min_exec = addr; | |
88 | if (addr > s->max_exec) | |
89 | s->max_exec = addr; | |
fa2d8369 AK |
90 | } |
91 | } | |
971a52d6 IM |
92 | if (print) { |
93 | printk(KERN_INFO | |
94 | " 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n", | |
95 | s->spg, s->lpg, s->gpg, s->exec, | |
96 | s->min_exec != ~0UL ? s->min_exec : 0, | |
97 | s->max_exec, missed); | |
98 | } | |
851339b1 | 99 | |
fa2d8369 AK |
100 | expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed; |
101 | if (expected != i) { | |
f87519e8 TG |
102 | printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n", |
103 | max_pfn_mapped, expected); | |
fa2d8369 AK |
104 | return 1; |
105 | } | |
106 | return err; | |
107 | } | |
108 | ||
971a52d6 IM |
109 | static unsigned long addr[NTEST]; |
110 | static unsigned int len[NTEST]; | |
fa2d8369 AK |
111 | |
112 | /* Change the global bit on random pages in the direct mapping */ | |
971a52d6 | 113 | static int pageattr_test(void) |
fa2d8369 | 114 | { |
851339b1 IM |
115 | struct split_state sa, sb, sc; |
116 | unsigned long *bm; | |
fa2d8369 | 117 | pte_t *pte, pte0; |
851339b1 | 118 | int failed = 0; |
93809be8 | 119 | unsigned int level; |
851339b1 | 120 | int i, k; |
fa2d8369 | 121 | int err; |
ab7e7924 | 122 | unsigned long test_addr; |
fa2d8369 | 123 | |
971a52d6 IM |
124 | if (print) |
125 | printk(KERN_INFO "CPA self-test:\n"); | |
fa2d8369 | 126 | |
c4d017f2 | 127 | bm = vzalloc((max_pfn_mapped + 7) / 8); |
fa2d8369 | 128 | if (!bm) { |
851339b1 | 129 | printk(KERN_ERR "CPA Cannot vmalloc bitmap\n"); |
fa2d8369 AK |
130 | return -ENOMEM; |
131 | } | |
fa2d8369 AK |
132 | |
133 | failed += print_split(&sa); | |
851339b1 | 134 | |
fa2d8369 | 135 | for (i = 0; i < NTEST; i++) { |
56a1ba5f | 136 | unsigned long pfn = prandom_u32() % max_pfn_mapped; |
851339b1 | 137 | |
fa2d8369 | 138 | addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT); |
56a1ba5f | 139 | len[i] = prandom_u32() % 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 | ||
ab7e7924 | 175 | test_addr = addr[i]; |
110e0358 | 176 | err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0); |
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); | |
5a654ba7 | 183 | if (!pte || !pte_testbit(*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 | } | |
ab7e7924 | 208 | test_addr = addr[i]; |
110e0358 | 209 | err = change_page_attr_clear(&test_addr, len[i], PAGE_CPA_TEST, 0); |
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); | |
5a654ba7 | 215 | if (!pte || pte_testbit(*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) { |
875e40b9 | 226 | WARN(1, KERN_ERR "NOT PASSED. Please report.\n"); |
971a52d6 | 227 | return -EINVAL; |
55ce29ba | 228 | } else { |
971a52d6 IM |
229 | if (print) |
230 | printk(KERN_INFO "ok.\n"); | |
55ce29ba | 231 | } |
fa2d8369 AK |
232 | |
233 | return 0; | |
234 | } | |
971a52d6 IM |
235 | |
236 | static int do_pageattr_test(void *__unused) | |
237 | { | |
238 | while (!kthread_should_stop()) { | |
239 | schedule_timeout_interruptible(HZ*30); | |
240 | if (pageattr_test() < 0) | |
241 | break; | |
242 | if (print) | |
243 | print--; | |
244 | } | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int start_pageattr_test(void) | |
249 | { | |
250 | struct task_struct *p; | |
251 | ||
252 | p = kthread_create(do_pageattr_test, NULL, "pageattr-test"); | |
253 | if (!IS_ERR(p)) | |
254 | wake_up_process(p); | |
255 | else | |
256 | WARN_ON(1); | |
257 | ||
258 | return 0; | |
259 | } | |
8f45fe44 | 260 | device_initcall(start_pageattr_test); |