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x86: Convert vmalloc()+memset() to vzalloc()
[~shefty/rdma-dev.git] / arch / x86 / mm / pageattr-test.c
1 /*
2  * self test for change_page_attr.
3  *
4  * Clears the a test pte bit on random pages in the direct mapping,
5  * then reverts and compares page tables forwards and afterwards.
6  */
7 #include <linux/bootmem.h>
8 #include <linux/kthread.h>
9 #include <linux/random.h>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/mm.h>
13
14 #include <asm/cacheflush.h>
15 #include <asm/pgtable.h>
16 #include <asm/kdebug.h>
17
18 /*
19  * Only print the results of the first pass:
20  */
21 static __read_mostly int print = 1;
22
23 enum {
24         NTEST                   = 400,
25 #ifdef CONFIG_X86_64
26         LPS                     = (1 << PMD_SHIFT),
27 #elif defined(CONFIG_X86_PAE)
28         LPS                     = (1 << PMD_SHIFT),
29 #else
30         LPS                     = (1 << 22),
31 #endif
32         GPS                     = (1<<30)
33 };
34
35 #define PAGE_CPA_TEST   __pgprot(_PAGE_CPA_TEST)
36
37 static int pte_testbit(pte_t pte)
38 {
39         return pte_flags(pte) & _PAGE_UNUSED1;
40 }
41
42 struct split_state {
43         long lpg, gpg, spg, exec;
44         long min_exec, max_exec;
45 };
46
47 static int print_split(struct split_state *s)
48 {
49         long i, expected, missed = 0;
50         int err = 0;
51
52         s->lpg = s->gpg = s->spg = s->exec = 0;
53         s->min_exec = ~0UL;
54         s->max_exec = 0;
55         for (i = 0; i < max_pfn_mapped; ) {
56                 unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT);
57                 unsigned int level;
58                 pte_t *pte;
59
60                 pte = lookup_address(addr, &level);
61                 if (!pte) {
62                         missed++;
63                         i++;
64                         continue;
65                 }
66
67                 if (level == PG_LEVEL_1G && sizeof(long) == 8) {
68                         s->gpg++;
69                         i += GPS/PAGE_SIZE;
70                 } else if (level == PG_LEVEL_2M) {
71                         if (!(pte_val(*pte) & _PAGE_PSE)) {
72                                 printk(KERN_ERR
73                                         "%lx level %d but not PSE %Lx\n",
74                                         addr, level, (u64)pte_val(*pte));
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++;
85                         if (addr < s->min_exec)
86                                 s->min_exec = addr;
87                         if (addr > s->max_exec)
88                                 s->max_exec = addr;
89                 }
90         }
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         }
98
99         expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed;
100         if (expected != i) {
101                 printk(KERN_ERR "CPA max_pfn_mapped %lu but expected %lu\n",
102                         max_pfn_mapped, expected);
103                 return 1;
104         }
105         return err;
106 }
107
108 static unsigned long addr[NTEST];
109 static unsigned int len[NTEST];
110
111 /* Change the global bit on random pages in the direct mapping */
112 static int pageattr_test(void)
113 {
114         struct split_state sa, sb, sc;
115         unsigned long *bm;
116         pte_t *pte, pte0;
117         int failed = 0;
118         unsigned int level;
119         int i, k;
120         int err;
121         unsigned long test_addr;
122
123         if (print)
124                 printk(KERN_INFO "CPA self-test:\n");
125
126         bm = vzalloc((max_pfn_mapped + 7) / 8);
127         if (!bm) {
128                 printk(KERN_ERR "CPA Cannot vmalloc bitmap\n");
129                 return -ENOMEM;
130         }
131
132         failed += print_split(&sa);
133         srandom32(100);
134
135         for (i = 0; i < NTEST; i++) {
136                 unsigned long pfn = random32() % max_pfn_mapped;
137
138                 addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT);
139                 len[i] = random32() % 100;
140                 len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1);
141
142                 if (len[i] == 0)
143                         len[i] = 1;
144
145                 pte = NULL;
146                 pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */
147
148                 for (k = 0; k < len[i]; k++) {
149                         pte = lookup_address(addr[i] + k*PAGE_SIZE, &level);
150                         if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 ||
151                             !(pte_val(*pte) & _PAGE_PRESENT)) {
152                                 addr[i] = 0;
153                                 break;
154                         }
155                         if (k == 0) {
156                                 pte0 = *pte;
157                         } else {
158                                 if (pgprot_val(pte_pgprot(*pte)) !=
159                                         pgprot_val(pte_pgprot(pte0))) {
160                                         len[i] = k;
161                                         break;
162                                 }
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
175                 test_addr = addr[i];
176                 err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0);
177                 if (err < 0) {
178                         printk(KERN_ERR "CPA %d failed %d\n", i, err);
179                         failed++;
180                 }
181
182                 pte = lookup_address(addr[i], &level);
183                 if (!pte || !pte_testbit(*pte) || pte_huge(*pte)) {
184                         printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i],
185                                 pte ? (u64)pte_val(*pte) : 0ULL);
186                         failed++;
187                 }
188                 if (level != PG_LEVEL_4K) {
189                         printk(KERN_ERR "CPA %lx: unexpected level %d\n",
190                                 addr[i], level);
191                         failed++;
192                 }
193
194         }
195         vfree(bm);
196
197         failed += print_split(&sb);
198
199         for (i = 0; i < NTEST; i++) {
200                 if (!addr[i])
201                         continue;
202                 pte = lookup_address(addr[i], &level);
203                 if (!pte) {
204                         printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]);
205                         failed++;
206                         continue;
207                 }
208                 test_addr = addr[i];
209                 err = change_page_attr_clear(&test_addr, len[i], PAGE_CPA_TEST, 0);
210                 if (err < 0) {
211                         printk(KERN_ERR "CPA reverting failed: %d\n", err);
212                         failed++;
213                 }
214                 pte = lookup_address(addr[i], &level);
215                 if (!pte || pte_testbit(*pte)) {
216                         printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n",
217                                 addr[i], pte ? (u64)pte_val(*pte) : 0ULL);
218                         failed++;
219                 }
220
221         }
222
223         failed += print_split(&sc);
224
225         if (failed) {
226                 WARN(1, KERN_ERR "NOT PASSED. Please report.\n");
227                 return -EINVAL;
228         } else {
229                 if (print)
230                         printk(KERN_INFO "ok.\n");
231         }
232
233         return 0;
234 }
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 }
260
261 module_init(start_pageattr_test);