summaryrefslogtreecommitdiff
path: root/drivers/mtd/tests/mtd_stresstest.c
blob: fea1dd78ccbecb54eaeae13de165229fc4da3ea6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; see the file COPYING. If not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Test random reads, writes and erases on MTD device.
 *
 * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/random.h>

static int dev = -EINVAL;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");

static int count = 10000;
module_param(count, int, S_IRUGO);
MODULE_PARM_DESC(count, "Number of operations to do (default is 10000)");

static struct mtd_info *mtd;
static unsigned char *writebuf;
static unsigned char *readbuf;
static unsigned char *bbt;
static int *offsets;

static int pgsize;
static int bufsize;
static int ebcnt;
static int pgcnt;

static int rand_eb(void)
{
	unsigned int eb;

again:
	eb = random32();
	/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
	eb %= (ebcnt - 1);
	if (bbt[eb])
		goto again;
	return eb;
}

static int rand_offs(void)
{
	unsigned int offs;

	offs = random32();
	offs %= bufsize;
	return offs;
}

static int rand_len(int offs)
{
	unsigned int len;

	len = random32();
	len %= (bufsize - offs);
	return len;
}

static int erase_eraseblock(int ebnum)
{
	int err;
	struct erase_info ei;
	loff_t addr = ebnum * mtd->erasesize;

	memset(&ei, 0, sizeof(struct erase_info));
	ei.mtd  = mtd;
	ei.addr = addr;
	ei.len  = mtd->erasesize;

	err = mtd_erase(mtd, &ei);
	if (unlikely(err)) {
		pr_err("error %d while erasing EB %d\n", err, ebnum);
		return err;
	}

	if (unlikely(ei.state == MTD_ERASE_FAILED)) {
		pr_err("some erase error occurred at EB %d\n",
		       ebnum);
		return -EIO;
	}

	return 0;
}

static int is_block_bad(int ebnum)
{
	loff_t addr = ebnum * mtd->erasesize;
	int ret;

	ret = mtd_block_isbad(mtd, addr);
	if (ret)
		pr_info("block %d is bad\n", ebnum);
	return ret;
}

static int do_read(void)
{
	size_t read;
	int eb = rand_eb();
	int offs = rand_offs();
	int len = rand_len(offs), err;
	loff_t addr;

	if (bbt[eb + 1]) {
		if (offs >= mtd->erasesize)
			offs -= mtd->erasesize;
		if (offs + len > mtd->erasesize)
			len = mtd->erasesize - offs;
	}
	addr = eb * mtd->erasesize + offs;
	err = mtd_read(mtd, addr, len, &read, readbuf);
	if (mtd_is_bitflip(err))
		err = 0;
	if (unlikely(err || read != len)) {
		pr_err("error: read failed at 0x%llx\n",
		       (long long)addr);
		if (!err)
			err = -EINVAL;
		return err;
	}
	return 0;
}

static int do_write(void)
{
	int eb = rand_eb(), offs, err, len;
	size_t written;
	loff_t addr;

	offs = offsets[eb];
	if (offs >= mtd->erasesize) {
		err = erase_eraseblock(eb);
		if (err)
			return err;
		offs = offsets[eb] = 0;
	}
	len = rand_len(offs);
	len = ((len + pgsize - 1) / pgsize) * pgsize;
	if (offs + len > mtd->erasesize) {
		if (bbt[eb + 1])
			len = mtd->erasesize - offs;
		else {
			err = erase_eraseblock(eb + 1);
			if (err)
				return err;
			offsets[eb + 1] = 0;
		}
	}
	addr = eb * mtd->erasesize + offs;
	err = mtd_write(mtd, addr, len, &written, writebuf);
	if (unlikely(err || written != len)) {
		pr_err("error: write failed at 0x%llx\n",
		       (long long)addr);
		if (!err)
			err = -EINVAL;
		return err;
	}
	offs += len;
	while (offs > mtd->erasesize) {
		offsets[eb++] = mtd->erasesize;
		offs -= mtd->erasesize;
	}
	offsets[eb] = offs;
	return 0;
}

static int do_operation(void)
{
	if (random32() & 1)
		return do_read();
	else
		return do_write();
}

static int scan_for_bad_eraseblocks(void)
{
	int i, bad = 0;

	bbt = kzalloc(ebcnt, GFP_KERNEL);
	if (!bbt) {
		pr_err("error: cannot allocate memory\n");
		return -ENOMEM;
	}

	if (!mtd_can_have_bb(mtd))
		return 0;

	pr_info("scanning for bad eraseblocks\n");
	for (i = 0; i < ebcnt; ++i) {
		bbt[i] = is_block_bad(i) ? 1 : 0;
		if (bbt[i])
			bad += 1;
		cond_resched();
	}
	pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
	return 0;
}

static int __init mtd_stresstest_init(void)
{
	int err;
	int i, op;
	uint64_t tmp;

	printk(KERN_INFO "\n");
	printk(KERN_INFO "=================================================\n");

	if (dev < 0) {
		pr_info("Please specify a valid mtd-device via module paramter\n");
		pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
		return -EINVAL;
	}

	pr_info("MTD device: %d\n", dev);

	mtd = get_mtd_device(NULL, dev);
	if (IS_ERR(mtd)) {
		err = PTR_ERR(mtd);
		pr_err("error: cannot get MTD device\n");
		return err;
	}

	if (mtd->writesize == 1) {
		pr_info("not NAND flash, assume page size is 512 "
		       "bytes.\n");
		pgsize = 512;
	} else
		pgsize = mtd->writesize;

	tmp = mtd->size;
	do_div(tmp, mtd->erasesize);
	ebcnt = tmp;
	pgcnt = mtd->erasesize / pgsize;

	pr_info("MTD device size %llu, eraseblock size %u, "
	       "page size %u, count of eraseblocks %u, pages per "
	       "eraseblock %u, OOB size %u\n",
	       (unsigned long long)mtd->size, mtd->erasesize,
	       pgsize, ebcnt, pgcnt, mtd->oobsize);

	if (ebcnt < 2) {
		pr_err("error: need at least 2 eraseblocks\n");
		err = -ENOSPC;
		goto out_put_mtd;
	}

	/* Read or write up 2 eraseblocks at a time */
	bufsize = mtd->erasesize * 2;

	err = -ENOMEM;
	readbuf = vmalloc(bufsize);
	writebuf = vmalloc(bufsize);
	offsets = kmalloc(ebcnt * sizeof(int), GFP_KERNEL);
	if (!readbuf || !writebuf || !offsets) {
		pr_err("error: cannot allocate memory\n");
		goto out;
	}
	for (i = 0; i < ebcnt; i++)
		offsets[i] = mtd->erasesize;
	for (i = 0; i < bufsize; i++)
		writebuf[i] = random32();

	err = scan_for_bad_eraseblocks();
	if (err)
		goto out;

	/* Do operations */
	pr_info("doing operations\n");
	for (op = 0; op < count; op++) {
		if ((op & 1023) == 0)
			pr_info("%d operations done\n", op);
		err = do_operation();
		if (err)
			goto out;
		cond_resched();
	}
	pr_info("finished, %d operations done\n", op);

out:
	kfree(offsets);
	kfree(bbt);
	vfree(writebuf);
	vfree(readbuf);
out_put_mtd:
	put_mtd_device(mtd);
	if (err)
		pr_info("error %d occurred\n", err);
	printk(KERN_INFO "=================================================\n");
	return err;
}
module_init(mtd_stresstest_init);

static void __exit mtd_stresstest_exit(void)
{
	return;
}
module_exit(mtd_stresstest_exit);

MODULE_DESCRIPTION("Stress test module");
MODULE_AUTHOR("Adrian Hunter");
MODULE_LICENSE("GPL");