summaryrefslogtreecommitdiff
path: root/drivers/mtd/tests/mtd_torturetest.c
blob: b65861bc7b8e59397df4b8469774dcb4881705cf (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
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
/*
 * Copyright (C) 2006-2008 Artem Bityutskiy
 * Copyright (C) 2006-2008 Jarkko Lavinen
 * Copyright (C) 2006-2008 Adrian Hunter
 *
 * 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.
 *
 * Authors: Artem Bityutskiy, Jarkko Lavinen, Adria Hunter
 *
 * WARNING: this test program may kill your flash and your device. Do not
 * use it unless you know what you do. Authors are not responsible for any
 * damage caused by this program.
 */

#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>

#define PRINT_PREF KERN_INFO "mtd_torturetest: "
#define RETRIES 3

static int eb = 8;
module_param(eb, int, S_IRUGO);
MODULE_PARM_DESC(eb, "eraseblock number within the selected MTD device");

static int ebcnt = 32;
module_param(ebcnt, int, S_IRUGO);
MODULE_PARM_DESC(ebcnt, "number of consecutive eraseblocks to torture");

static int pgcnt;
module_param(pgcnt, int, S_IRUGO);
MODULE_PARM_DESC(pgcnt, "number of pages per eraseblock to torture (0 => all)");

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

static int gran = 512;
module_param(gran, int, S_IRUGO);
MODULE_PARM_DESC(gran, "how often the status information should be printed");

static int check = 1;
module_param(check, int, S_IRUGO);
MODULE_PARM_DESC(check, "if the written data should be checked");

static unsigned int cycles_count;
module_param(cycles_count, uint, S_IRUGO);
MODULE_PARM_DESC(cycles_count, "how many erase cycles to do "
			       "(infinite by default)");

static struct mtd_info *mtd;

/* This buffer contains 0x555555...0xAAAAAA... pattern */
static unsigned char *patt_5A5;
/* This buffer contains 0xAAAAAA...0x555555... pattern */
static unsigned char *patt_A5A;
/* This buffer contains all 0xFF bytes */
static unsigned char *patt_FF;
/* This a temporary buffer is use when checking data */
static unsigned char *check_buf;
/* How many erase cycles were done */
static unsigned int erase_cycles;

static int pgsize;
static struct timeval start, finish;

static void report_corrupt(unsigned char *read, unsigned char *written);

static inline void start_timing(void)
{
	do_gettimeofday(&start);
}

static inline void stop_timing(void)
{
	do_gettimeofday(&finish);
}

/*
 * Erase eraseblock number @ebnum.
 */
static inline 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 (err) {
		printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
		return err;
	}

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

	return 0;
}

/*
 * Check that the contents of eraseblock number @enbum is equivalent to the
 * @buf buffer.
 */
static inline int check_eraseblock(int ebnum, unsigned char *buf)
{
	int err, retries = 0;
	size_t read;
	loff_t addr = ebnum * mtd->erasesize;
	size_t len = mtd->erasesize;

	if (pgcnt) {
		addr = (ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
		len = pgcnt * pgsize;
	}

retry:
	err = mtd_read(mtd, addr, len, &read, check_buf);
	if (mtd_is_bitflip(err))
		printk(PRINT_PREF "single bit flip occurred at EB %d "
		       "MTD reported that it was fixed.\n", ebnum);
	else if (err) {
		printk(PRINT_PREF "error %d while reading EB %d, "
		       "read %zd\n", err, ebnum, read);
		return err;
	}

	if (read != len) {
		printk(PRINT_PREF "failed to read %zd bytes from EB %d, "
		       "read only %zd, but no error reported\n",
		       len, ebnum, read);
		return -EIO;
	}

	if (memcmp(buf, check_buf, len)) {
		printk(PRINT_PREF "read wrong data from EB %d\n", ebnum);
		report_corrupt(check_buf, buf);

		if (retries++ < RETRIES) {
			/* Try read again */
			yield();
			printk(PRINT_PREF "re-try reading data from EB %d\n",
			       ebnum);
			goto retry;
		} else {
			printk(PRINT_PREF "retried %d times, still errors, "
			       "give-up\n", RETRIES);
			return -EINVAL;
		}
	}

	if (retries != 0)
		printk(PRINT_PREF "only attempt number %d was OK (!!!)\n",
		       retries);

	return 0;
}

static inline int write_pattern(int ebnum, void *buf)
{
	int err;
	size_t written;
	loff_t addr = ebnum * mtd->erasesize;
	size_t len = mtd->erasesize;

	if (pgcnt) {
		addr = (ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
		len = pgcnt * pgsize;
	}
	err = mtd_write(mtd, addr, len, &written, buf);
	if (err) {
		printk(PRINT_PREF "error %d while writing EB %d, written %zd"
		      " bytes\n", err, ebnum, written);
		return err;
	}
	if (written != len) {
		printk(PRINT_PREF "written only %zd bytes of %zd, but no error"
		       " reported\n", written, len);
		return -EIO;
	}

	return 0;
}

static int __init tort_init(void)
{
	int err = 0, i, infinite = !cycles_count;
	int bad_ebs[ebcnt];

	printk(KERN_INFO "\n");
	printk(KERN_INFO "=================================================\n");
	printk(PRINT_PREF "Warning: this program is trying to wear out your "
	       "flash, stop it if this is not wanted.\n");

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

	printk(PRINT_PREF "MTD device: %d\n", dev);
	printk(PRINT_PREF "torture %d eraseblocks (%d-%d) of mtd%d\n",
	       ebcnt, eb, eb + ebcnt - 1, dev);
	if (pgcnt)
		printk(PRINT_PREF "torturing just %d pages per eraseblock\n",
			pgcnt);
	printk(PRINT_PREF "write verify %s\n", check ? "enabled" : "disabled");

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

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

	if (pgcnt && (pgcnt > mtd->erasesize / pgsize || pgcnt < 0)) {
		printk(PRINT_PREF "error: invalid pgcnt value %d\n", pgcnt);
		goto out_mtd;
	}

	err = -ENOMEM;
	patt_5A5 = kmalloc(mtd->erasesize, GFP_KERNEL);
	if (!patt_5A5) {
		printk(PRINT_PREF "error: cannot allocate memory\n");
		goto out_mtd;
	}

	patt_A5A = kmalloc(mtd->erasesize, GFP_KERNEL);
	if (!patt_A5A) {
		printk(PRINT_PREF "error: cannot allocate memory\n");
		goto out_patt_5A5;
	}

	patt_FF = kmalloc(mtd->erasesize, GFP_KERNEL);
	if (!patt_FF) {
		printk(PRINT_PREF "error: cannot allocate memory\n");
		goto out_patt_A5A;
	}

	check_buf = kmalloc(mtd->erasesize, GFP_KERNEL);
	if (!check_buf) {
		printk(PRINT_PREF "error: cannot allocate memory\n");
		goto out_patt_FF;
	}

	err = 0;

	/* Initialize patterns */
	memset(patt_FF, 0xFF, mtd->erasesize);
	for (i = 0; i < mtd->erasesize / pgsize; i++) {
		if (!(i & 1)) {
			memset(patt_5A5 + i * pgsize, 0x55, pgsize);
			memset(patt_A5A + i * pgsize, 0xAA, pgsize);
		} else {
			memset(patt_5A5 + i * pgsize, 0xAA, pgsize);
			memset(patt_A5A + i * pgsize, 0x55, pgsize);
		}
	}

	/*
	 * Check if there is a bad eraseblock among those we are going to test.
	 */
	memset(&bad_ebs[0], 0, sizeof(int) * ebcnt);
	if (mtd_can_have_bb(mtd)) {
		for (i = eb; i < eb + ebcnt; i++) {
			err = mtd_block_isbad(mtd, (loff_t)i * mtd->erasesize);

			if (err < 0) {
				printk(PRINT_PREF "block_isbad() returned %d "
				       "for EB %d\n", err, i);
				goto out;
			}

			if (err) {
				printk("EB %d is bad. Skip it.\n", i);
				bad_ebs[i - eb] = 1;
			}
		}
	}

	start_timing();
	while (1) {
		int i;
		void *patt;

		/* Erase all eraseblocks */
		for (i = eb; i < eb + ebcnt; i++) {
			if (bad_ebs[i - eb])
				continue;
			err = erase_eraseblock(i);
			if (err)
				goto out;
			cond_resched();
		}

		/* Check if the eraseblocks contain only 0xFF bytes */
		if (check) {
			for (i = eb; i < eb + ebcnt; i++) {
				if (bad_ebs[i - eb])
					continue;
				err = check_eraseblock(i, patt_FF);
				if (err) {
					printk(PRINT_PREF "verify failed"
					       " for 0xFF... pattern\n");
					goto out;
				}
				cond_resched();
			}
		}

		/* Write the pattern */
		for (i = eb; i < eb + ebcnt; i++) {
			if (bad_ebs[i - eb])
				continue;
			if ((eb + erase_cycles) & 1)
				patt = patt_5A5;
			else
				patt = patt_A5A;
			err = write_pattern(i, patt);
			if (err)
				goto out;
			cond_resched();
		}

		/* Verify what we wrote */
		if (check) {
			for (i = eb; i < eb + ebcnt; i++) {
				if (bad_ebs[i - eb])
					continue;
				if ((eb + erase_cycles) & 1)
					patt = patt_5A5;
				else
					patt = patt_A5A;
				err = check_eraseblock(i, patt);
				if (err) {
					printk(PRINT_PREF "verify failed for %s"
					       " pattern\n",
					       ((eb + erase_cycles) & 1) ?
					       "0x55AA55..." : "0xAA55AA...");
					goto out;
				}
				cond_resched();
			}
		}

		erase_cycles += 1;

		if (erase_cycles % gran == 0) {
			long ms;

			stop_timing();
			ms = (finish.tv_sec - start.tv_sec) * 1000 +
			     (finish.tv_usec - start.tv_usec) / 1000;
			printk(PRINT_PREF "%08u erase cycles done, took %lu "
			       "milliseconds (%lu seconds)\n",
			       erase_cycles, ms, ms / 1000);
			start_timing();
		}

		if (!infinite && --cycles_count == 0)
			break;
	}
out:

	printk(PRINT_PREF "finished after %u erase cycles\n",
	       erase_cycles);
	kfree(check_buf);
out_patt_FF:
	kfree(patt_FF);
out_patt_A5A:
	kfree(patt_A5A);
out_patt_5A5:
	kfree(patt_5A5);
out_mtd:
	put_mtd_device(mtd);
	if (err)
		printk(PRINT_PREF "error %d occurred during torturing\n", err);
	printk(KERN_INFO "=================================================\n");
	return err;
}
module_init(tort_init);

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

static int countdiffs(unsigned char *buf, unsigned char *check_buf,
		      unsigned offset, unsigned len, unsigned *bytesp,
		      unsigned *bitsp);
static void print_bufs(unsigned char *read, unsigned char *written, int start,
		       int len);

/*
 * Report the detailed information about how the read EB differs from what was
 * written.
 */
static void report_corrupt(unsigned char *read, unsigned char *written)
{
	int i;
	int bytes, bits, pages, first;
	int offset, len;
	size_t check_len = mtd->erasesize;

	if (pgcnt)
		check_len = pgcnt * pgsize;

	bytes = bits = pages = 0;
	for (i = 0; i < check_len; i += pgsize)
		if (countdiffs(written, read, i, pgsize, &bytes,
			       &bits) >= 0)
			pages++;

	printk(PRINT_PREF "verify fails on %d pages, %d bytes/%d bits\n",
	       pages, bytes, bits);
	printk(PRINT_PREF "The following is a list of all differences between"
	       " what was read from flash and what was expected\n");

	for (i = 0; i < check_len; i += pgsize) {
		cond_resched();
		bytes = bits = 0;
		first = countdiffs(written, read, i, pgsize, &bytes,
				   &bits);
		if (first < 0)
			continue;

		printk("-------------------------------------------------------"
		       "----------------------------------\n");

		printk(PRINT_PREF "Page %zd has %d bytes/%d bits failing verify,"
		       " starting at offset 0x%x\n",
		       (mtd->erasesize - check_len + i) / pgsize,
		       bytes, bits, first);

		offset = first & ~0x7;
		len = ((first + bytes) | 0x7) + 1 - offset;

		print_bufs(read, written, offset, len);
	}
}

static void print_bufs(unsigned char *read, unsigned char *written, int start,
		       int len)
{
	int i = 0, j1, j2;
	char *diff;

	printk("Offset       Read                          Written\n");
	while (i < len) {
		printk("0x%08x: ", start + i);
		diff = "   ";
		for (j1 = 0; j1 < 8 && i + j1 < len; j1++) {
			printk(" %02x", read[start + i + j1]);
			if (read[start + i + j1] != written[start + i + j1])
				diff = "***";
		}

		while (j1 < 8) {
			printk(" ");
			j1 += 1;
		}

		printk("  %s ", diff);

		for (j2 = 0; j2 < 8 && i + j2 < len; j2++)
			printk(" %02x", written[start + i + j2]);
		printk("\n");
		i += 8;
	}
}

/*
 * Count the number of differing bytes and bits and return the first differing
 * offset.
 */
static int countdiffs(unsigned char *buf, unsigned char *check_buf,
		      unsigned offset, unsigned len, unsigned *bytesp,
		      unsigned *bitsp)
{
	unsigned i, bit;
	int first = -1;

	for (i = offset; i < offset + len; i++)
		if (buf[i] != check_buf[i]) {
			first = i;
			break;
		}

	while (i < offset + len) {
		if (buf[i] != check_buf[i]) {
			(*bytesp)++;
			bit = 1;
			while (bit < 256) {
				if ((buf[i] & bit) != (check_buf[i] & bit))
					(*bitsp)++;
				bit <<= 1;
			}
		}
		i++;
	}

	return first;
}

MODULE_DESCRIPTION("Eraseblock torturing module");
MODULE_AUTHOR("Artem Bityutskiy, Jarkko Lavinen, Adrian Hunter");
MODULE_LICENSE("GPL");