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1 | /* |
2 | * Copyright (C) 2006-2008 Nokia Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License version 2 as published by | |
6 | * the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; see the file COPYING. If not, write to the Free Software | |
15 | * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
16 | * | |
17 | * Test random reads, writes and erases on MTD device. | |
18 | * | |
19 | * Author: Adrian Hunter <ext-adrian.hunter@nokia.com> | |
20 | */ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/mtd/mtd.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/vmalloc.h> | |
29 | ||
30 | #define PRINT_PREF KERN_INFO "mtd_stresstest: " | |
31 | ||
32 | static int dev; | |
33 | module_param(dev, int, S_IRUGO); | |
34 | MODULE_PARM_DESC(dev, "MTD device number to use"); | |
35 | ||
36 | static int count = 10000; | |
37 | module_param(count, int, S_IRUGO); | |
38 | MODULE_PARM_DESC(count, "Number of operations to do (default is 10000)"); | |
39 | ||
40 | static struct mtd_info *mtd; | |
41 | static unsigned char *writebuf; | |
42 | static unsigned char *readbuf; | |
43 | static unsigned char *bbt; | |
44 | static int *offsets; | |
45 | ||
46 | static int pgsize; | |
47 | static int bufsize; | |
48 | static int ebcnt; | |
49 | static int pgcnt; | |
50 | static unsigned long next = 1; | |
51 | ||
52 | static inline unsigned int simple_rand(void) | |
53 | { | |
54 | next = next * 1103515245 + 12345; | |
55 | return (unsigned int)((next / 65536) % 32768); | |
56 | } | |
57 | ||
58 | static inline void simple_srand(unsigned long seed) | |
59 | { | |
60 | next = seed; | |
61 | } | |
62 | ||
63 | static int rand_eb(void) | |
64 | { | |
65 | int eb; | |
66 | ||
67 | again: | |
68 | if (ebcnt < 32768) | |
69 | eb = simple_rand(); | |
70 | else | |
71 | eb = (simple_rand() << 15) | simple_rand(); | |
72 | /* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */ | |
73 | eb %= (ebcnt - 1); | |
74 | if (bbt[eb]) | |
75 | goto again; | |
76 | return eb; | |
77 | } | |
78 | ||
79 | static int rand_offs(void) | |
80 | { | |
81 | int offs; | |
82 | ||
83 | if (bufsize < 32768) | |
84 | offs = simple_rand(); | |
85 | else | |
86 | offs = (simple_rand() << 15) | simple_rand(); | |
87 | offs %= bufsize; | |
88 | return offs; | |
89 | } | |
90 | ||
91 | static int rand_len(int offs) | |
92 | { | |
93 | int len; | |
94 | ||
95 | if (bufsize < 32768) | |
96 | len = simple_rand(); | |
97 | else | |
98 | len = (simple_rand() << 15) | simple_rand(); | |
99 | len %= (bufsize - offs); | |
100 | return len; | |
101 | } | |
102 | ||
103 | static int erase_eraseblock(int ebnum) | |
104 | { | |
105 | int err; | |
106 | struct erase_info ei; | |
107 | loff_t addr = ebnum * mtd->erasesize; | |
108 | ||
109 | memset(&ei, 0, sizeof(struct erase_info)); | |
110 | ei.mtd = mtd; | |
111 | ei.addr = addr; | |
112 | ei.len = mtd->erasesize; | |
113 | ||
114 | err = mtd->erase(mtd, &ei); | |
115 | if (unlikely(err)) { | |
116 | printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum); | |
117 | return err; | |
118 | } | |
119 | ||
120 | if (unlikely(ei.state == MTD_ERASE_FAILED)) { | |
121 | printk(PRINT_PREF "some erase error occurred at EB %d\n", | |
122 | ebnum); | |
123 | return -EIO; | |
124 | } | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static int is_block_bad(int ebnum) | |
130 | { | |
131 | loff_t addr = ebnum * mtd->erasesize; | |
132 | int ret; | |
133 | ||
134 | ret = mtd->block_isbad(mtd, addr); | |
135 | if (ret) | |
136 | printk(PRINT_PREF "block %d is bad\n", ebnum); | |
137 | return ret; | |
138 | } | |
139 | ||
140 | static int do_read(void) | |
141 | { | |
142 | size_t read = 0; | |
143 | int eb = rand_eb(); | |
144 | int offs = rand_offs(); | |
145 | int len = rand_len(offs), err; | |
146 | loff_t addr; | |
147 | ||
148 | if (bbt[eb + 1]) { | |
149 | if (offs >= mtd->erasesize) | |
150 | offs -= mtd->erasesize; | |
151 | if (offs + len > mtd->erasesize) | |
152 | len = mtd->erasesize - offs; | |
153 | } | |
154 | addr = eb * mtd->erasesize + offs; | |
155 | err = mtd->read(mtd, addr, len, &read, readbuf); | |
156 | if (err == -EUCLEAN) | |
157 | err = 0; | |
158 | if (unlikely(err || read != len)) { | |
159 | printk(PRINT_PREF "error: read failed at 0x%llx\n", | |
160 | (long long)addr); | |
161 | if (!err) | |
162 | err = -EINVAL; | |
163 | return err; | |
164 | } | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static int do_write(void) | |
169 | { | |
170 | int eb = rand_eb(), offs, err, len; | |
171 | size_t written = 0; | |
172 | loff_t addr; | |
173 | ||
174 | offs = offsets[eb]; | |
175 | if (offs >= mtd->erasesize) { | |
176 | err = erase_eraseblock(eb); | |
177 | if (err) | |
178 | return err; | |
179 | offs = offsets[eb] = 0; | |
180 | } | |
181 | len = rand_len(offs); | |
182 | len = ((len + pgsize - 1) / pgsize) * pgsize; | |
183 | if (offs + len > mtd->erasesize) { | |
184 | if (bbt[eb + 1]) | |
185 | len = mtd->erasesize - offs; | |
186 | else { | |
187 | err = erase_eraseblock(eb + 1); | |
188 | if (err) | |
189 | return err; | |
190 | offsets[eb + 1] = 0; | |
191 | } | |
192 | } | |
193 | addr = eb * mtd->erasesize + offs; | |
194 | err = mtd->write(mtd, addr, len, &written, writebuf); | |
195 | if (unlikely(err || written != len)) { | |
196 | printk(PRINT_PREF "error: write failed at 0x%llx\n", | |
197 | (long long)addr); | |
198 | if (!err) | |
199 | err = -EINVAL; | |
200 | return err; | |
201 | } | |
202 | offs += len; | |
203 | while (offs > mtd->erasesize) { | |
204 | offsets[eb++] = mtd->erasesize; | |
205 | offs -= mtd->erasesize; | |
206 | } | |
207 | offsets[eb] = offs; | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static int do_operation(void) | |
212 | { | |
213 | if (simple_rand() & 1) | |
214 | return do_read(); | |
215 | else | |
216 | return do_write(); | |
217 | } | |
218 | ||
219 | static int scan_for_bad_eraseblocks(void) | |
220 | { | |
221 | int i, bad = 0; | |
222 | ||
223 | bbt = kmalloc(ebcnt, GFP_KERNEL); | |
224 | if (!bbt) { | |
225 | printk(PRINT_PREF "error: cannot allocate memory\n"); | |
226 | return -ENOMEM; | |
227 | } | |
228 | memset(bbt, 0 , ebcnt); | |
229 | ||
f5e2bae0 MTS |
230 | /* NOR flash does not implement block_isbad */ |
231 | if (mtd->block_isbad == NULL) | |
232 | return 0; | |
233 | ||
7163cea1 AB |
234 | printk(PRINT_PREF "scanning for bad eraseblocks\n"); |
235 | for (i = 0; i < ebcnt; ++i) { | |
236 | bbt[i] = is_block_bad(i) ? 1 : 0; | |
237 | if (bbt[i]) | |
238 | bad += 1; | |
239 | cond_resched(); | |
240 | } | |
241 | printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static int __init mtd_stresstest_init(void) | |
246 | { | |
247 | int err; | |
248 | int i, op; | |
249 | uint64_t tmp; | |
250 | ||
251 | printk(KERN_INFO "\n"); | |
252 | printk(KERN_INFO "=================================================\n"); | |
253 | printk(PRINT_PREF "MTD device: %d\n", dev); | |
254 | ||
255 | mtd = get_mtd_device(NULL, dev); | |
256 | if (IS_ERR(mtd)) { | |
257 | err = PTR_ERR(mtd); | |
258 | printk(PRINT_PREF "error: cannot get MTD device\n"); | |
259 | return err; | |
260 | } | |
261 | ||
262 | if (mtd->writesize == 1) { | |
263 | printk(PRINT_PREF "not NAND flash, assume page size is 512 " | |
264 | "bytes.\n"); | |
265 | pgsize = 512; | |
266 | } else | |
267 | pgsize = mtd->writesize; | |
268 | ||
269 | tmp = mtd->size; | |
270 | do_div(tmp, mtd->erasesize); | |
271 | ebcnt = tmp; | |
f5e2bae0 | 272 | pgcnt = mtd->erasesize / pgsize; |
7163cea1 AB |
273 | |
274 | printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, " | |
275 | "page size %u, count of eraseblocks %u, pages per " | |
276 | "eraseblock %u, OOB size %u\n", | |
277 | (unsigned long long)mtd->size, mtd->erasesize, | |
278 | pgsize, ebcnt, pgcnt, mtd->oobsize); | |
279 | ||
280 | /* Read or write up 2 eraseblocks at a time */ | |
281 | bufsize = mtd->erasesize * 2; | |
282 | ||
283 | err = -ENOMEM; | |
284 | readbuf = vmalloc(bufsize); | |
285 | writebuf = vmalloc(bufsize); | |
286 | offsets = kmalloc(ebcnt * sizeof(int), GFP_KERNEL); | |
287 | if (!readbuf || !writebuf || !offsets) { | |
288 | printk(PRINT_PREF "error: cannot allocate memory\n"); | |
289 | goto out; | |
290 | } | |
291 | for (i = 0; i < ebcnt; i++) | |
292 | offsets[i] = mtd->erasesize; | |
293 | simple_srand(current->pid); | |
294 | for (i = 0; i < bufsize; i++) | |
295 | writebuf[i] = simple_rand(); | |
296 | ||
297 | err = scan_for_bad_eraseblocks(); | |
298 | if (err) | |
299 | goto out; | |
300 | ||
301 | /* Do operations */ | |
302 | printk(PRINT_PREF "doing operations\n"); | |
303 | for (op = 0; op < count; op++) { | |
304 | if ((op & 1023) == 0) | |
305 | printk(PRINT_PREF "%d operations done\n", op); | |
306 | err = do_operation(); | |
307 | if (err) | |
308 | goto out; | |
309 | cond_resched(); | |
310 | } | |
311 | printk(PRINT_PREF "finished, %d operations done\n", op); | |
312 | ||
313 | out: | |
314 | kfree(offsets); | |
315 | kfree(bbt); | |
316 | vfree(writebuf); | |
317 | vfree(readbuf); | |
318 | put_mtd_device(mtd); | |
319 | if (err) | |
320 | printk(PRINT_PREF "error %d occurred\n", err); | |
321 | printk(KERN_INFO "=================================================\n"); | |
322 | return err; | |
323 | } | |
324 | module_init(mtd_stresstest_init); | |
325 | ||
326 | static void __exit mtd_stresstest_exit(void) | |
327 | { | |
328 | return; | |
329 | } | |
330 | module_exit(mtd_stresstest_exit); | |
331 | ||
332 | MODULE_DESCRIPTION("Stress test module"); | |
333 | MODULE_AUTHOR("Adrian Hunter"); | |
334 | MODULE_LICENSE("GPL"); |