2 * Copyright (C) 2006-2008 Nokia Corporation
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.
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
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.
17 * Test random reads, writes and erases on MTD device.
19 * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/err.h>
28 #include <linux/mtd/mtd.h>
29 #include <linux/slab.h>
30 #include <linux/sched.h>
31 #include <linux/vmalloc.h>
32 #include <linux/random.h>
34 static int dev = -EINVAL;
35 module_param(dev, int, S_IRUGO);
36 MODULE_PARM_DESC(dev, "MTD device number to use");
38 static int count = 10000;
39 module_param(count, int, S_IRUGO);
40 MODULE_PARM_DESC(count, "Number of operations to do (default is 10000)");
42 static struct mtd_info *mtd;
43 static unsigned char *writebuf;
44 static unsigned char *readbuf;
45 static unsigned char *bbt;
53 static int rand_eb(void)
59 /* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
66 static int rand_offs(void)
75 static int rand_len(int offs)
80 len %= (bufsize - offs);
84 static int erase_eraseblock(int ebnum)
88 loff_t addr = ebnum * mtd->erasesize;
90 memset(&ei, 0, sizeof(struct erase_info));
93 ei.len = mtd->erasesize;
95 err = mtd_erase(mtd, &ei);
97 pr_err("error %d while erasing EB %d\n", err, ebnum);
101 if (unlikely(ei.state == MTD_ERASE_FAILED)) {
102 pr_err("some erase error occurred at EB %d\n",
110 static int is_block_bad(int ebnum)
112 loff_t addr = ebnum * mtd->erasesize;
115 ret = mtd_block_isbad(mtd, addr);
117 pr_info("block %d is bad\n", ebnum);
121 static int do_read(void)
125 int offs = rand_offs();
126 int len = rand_len(offs), err;
130 if (offs >= mtd->erasesize)
131 offs -= mtd->erasesize;
132 if (offs + len > mtd->erasesize)
133 len = mtd->erasesize - offs;
135 addr = eb * mtd->erasesize + offs;
136 err = mtd_read(mtd, addr, len, &read, readbuf);
137 if (mtd_is_bitflip(err))
139 if (unlikely(err || read != len)) {
140 pr_err("error: read failed at 0x%llx\n",
149 static int do_write(void)
151 int eb = rand_eb(), offs, err, len;
156 if (offs >= mtd->erasesize) {
157 err = erase_eraseblock(eb);
160 offs = offsets[eb] = 0;
162 len = rand_len(offs);
163 len = ((len + pgsize - 1) / pgsize) * pgsize;
164 if (offs + len > mtd->erasesize) {
166 len = mtd->erasesize - offs;
168 err = erase_eraseblock(eb + 1);
174 addr = eb * mtd->erasesize + offs;
175 err = mtd_write(mtd, addr, len, &written, writebuf);
176 if (unlikely(err || written != len)) {
177 pr_err("error: write failed at 0x%llx\n",
184 while (offs > mtd->erasesize) {
185 offsets[eb++] = mtd->erasesize;
186 offs -= mtd->erasesize;
192 static int do_operation(void)
200 static int scan_for_bad_eraseblocks(void)
204 bbt = kzalloc(ebcnt, GFP_KERNEL);
206 pr_err("error: cannot allocate memory\n");
210 if (!mtd_can_have_bb(mtd))
213 pr_info("scanning for bad eraseblocks\n");
214 for (i = 0; i < ebcnt; ++i) {
215 bbt[i] = is_block_bad(i) ? 1 : 0;
220 pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
224 static int __init mtd_stresstest_init(void)
230 printk(KERN_INFO "\n");
231 printk(KERN_INFO "=================================================\n");
234 pr_info("Please specify a valid mtd-device via module parameter\n");
235 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
239 pr_info("MTD device: %d\n", dev);
241 mtd = get_mtd_device(NULL, dev);
244 pr_err("error: cannot get MTD device\n");
248 if (mtd->writesize == 1) {
249 pr_info("not NAND flash, assume page size is 512 "
253 pgsize = mtd->writesize;
256 do_div(tmp, mtd->erasesize);
258 pgcnt = mtd->erasesize / pgsize;
260 pr_info("MTD device size %llu, eraseblock size %u, "
261 "page size %u, count of eraseblocks %u, pages per "
262 "eraseblock %u, OOB size %u\n",
263 (unsigned long long)mtd->size, mtd->erasesize,
264 pgsize, ebcnt, pgcnt, mtd->oobsize);
267 pr_err("error: need at least 2 eraseblocks\n");
272 /* Read or write up 2 eraseblocks at a time */
273 bufsize = mtd->erasesize * 2;
276 readbuf = vmalloc(bufsize);
277 writebuf = vmalloc(bufsize);
278 offsets = kmalloc(ebcnt * sizeof(int), GFP_KERNEL);
279 if (!readbuf || !writebuf || !offsets) {
280 pr_err("error: cannot allocate memory\n");
283 for (i = 0; i < ebcnt; i++)
284 offsets[i] = mtd->erasesize;
285 for (i = 0; i < bufsize; i++)
286 writebuf[i] = random32();
288 err = scan_for_bad_eraseblocks();
293 pr_info("doing operations\n");
294 for (op = 0; op < count; op++) {
295 if ((op & 1023) == 0)
296 pr_info("%d operations done\n", op);
297 err = do_operation();
302 pr_info("finished, %d operations done\n", op);
312 pr_info("error %d occurred\n", err);
313 printk(KERN_INFO "=================================================\n");
316 module_init(mtd_stresstest_init);
318 static void __exit mtd_stresstest_exit(void)
322 module_exit(mtd_stresstest_exit);
324 MODULE_DESCRIPTION("Stress test module");
325 MODULE_AUTHOR("Adrian Hunter");
326 MODULE_LICENSE("GPL");