2 * Copyright (C) 2006-2008 Artem Bityutskiy
3 * Copyright (C) 2006-2008 Jarkko Lavinen
4 * Copyright (C) 2006-2008 Adrian Hunter
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; see the file COPYING. If not, write to the Free Software
17 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 * Authors: Artem Bityutskiy, Jarkko Lavinen, Adria Hunter
21 * WARNING: this test program may kill your flash and your device. Do not
22 * use it unless you know what you do. Authors are not responsible for any
23 * damage caused by this program.
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
28 #include <linux/init.h>
29 #include <linux/ktime.h>
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/err.h>
33 #include <linux/mtd/mtd.h>
34 #include <linux/slab.h>
35 #include <linux/sched.h>
41 module_param(eb
, int, S_IRUGO
);
42 MODULE_PARM_DESC(eb
, "eraseblock number within the selected MTD device");
44 static int ebcnt
= 32;
45 module_param(ebcnt
, int, S_IRUGO
);
46 MODULE_PARM_DESC(ebcnt
, "number of consecutive eraseblocks to torture");
49 module_param(pgcnt
, int, S_IRUGO
);
50 MODULE_PARM_DESC(pgcnt
, "number of pages per eraseblock to torture (0 => all)");
52 static int dev
= -EINVAL
;
53 module_param(dev
, int, S_IRUGO
);
54 MODULE_PARM_DESC(dev
, "MTD device number to use");
56 static int gran
= 512;
57 module_param(gran
, int, S_IRUGO
);
58 MODULE_PARM_DESC(gran
, "how often the status information should be printed");
61 module_param(check
, int, S_IRUGO
);
62 MODULE_PARM_DESC(check
, "if the written data should be checked");
64 static unsigned int cycles_count
;
65 module_param(cycles_count
, uint
, S_IRUGO
);
66 MODULE_PARM_DESC(cycles_count
, "how many erase cycles to do "
67 "(infinite by default)");
69 static struct mtd_info
*mtd
;
71 /* This buffer contains 0x555555...0xAAAAAA... pattern */
72 static unsigned char *patt_5A5
;
73 /* This buffer contains 0xAAAAAA...0x555555... pattern */
74 static unsigned char *patt_A5A
;
75 /* This buffer contains all 0xFF bytes */
76 static unsigned char *patt_FF
;
77 /* This a temporary buffer is use when checking data */
78 static unsigned char *check_buf
;
79 /* How many erase cycles were done */
80 static unsigned int erase_cycles
;
83 static ktime_t start
, finish
;
85 static void report_corrupt(unsigned char *read
, unsigned char *written
);
87 static inline void start_timing(void)
92 static inline void stop_timing(void)
98 * Check that the contents of eraseblock number @enbum is equivalent to the
101 static inline int check_eraseblock(int ebnum
, unsigned char *buf
)
103 int err
, retries
= 0;
105 loff_t addr
= (loff_t
)ebnum
* mtd
->erasesize
;
106 size_t len
= mtd
->erasesize
;
109 addr
= (loff_t
)(ebnum
+ 1) * mtd
->erasesize
- pgcnt
* pgsize
;
110 len
= pgcnt
* pgsize
;
114 err
= mtd_read(mtd
, addr
, len
, &read
, check_buf
);
115 if (mtd_is_bitflip(err
))
116 pr_err("single bit flip occurred at EB %d "
117 "MTD reported that it was fixed.\n", ebnum
);
119 pr_err("error %d while reading EB %d, "
120 "read %zd\n", err
, ebnum
, read
);
125 pr_err("failed to read %zd bytes from EB %d, "
126 "read only %zd, but no error reported\n",
131 if (memcmp(buf
, check_buf
, len
)) {
132 pr_err("read wrong data from EB %d\n", ebnum
);
133 report_corrupt(check_buf
, buf
);
135 if (retries
++ < RETRIES
) {
138 pr_info("re-try reading data from EB %d\n",
142 pr_info("retried %d times, still errors, "
143 "give-up\n", RETRIES
);
149 pr_info("only attempt number %d was OK (!!!)\n",
155 static inline int write_pattern(int ebnum
, void *buf
)
159 loff_t addr
= (loff_t
)ebnum
* mtd
->erasesize
;
160 size_t len
= mtd
->erasesize
;
163 addr
= (loff_t
)(ebnum
+ 1) * mtd
->erasesize
- pgcnt
* pgsize
;
164 len
= pgcnt
* pgsize
;
166 err
= mtd_write(mtd
, addr
, len
, &written
, buf
);
168 pr_err("error %d while writing EB %d, written %zd"
169 " bytes\n", err
, ebnum
, written
);
172 if (written
!= len
) {
173 pr_info("written only %zd bytes of %zd, but no error"
174 " reported\n", written
, len
);
181 static int __init
tort_init(void)
183 int err
= 0, i
, infinite
= !cycles_count
;
184 unsigned char *bad_ebs
;
186 printk(KERN_INFO
"\n");
187 printk(KERN_INFO
"=================================================\n");
188 pr_info("Warning: this program is trying to wear out your "
189 "flash, stop it if this is not wanted.\n");
192 pr_info("Please specify a valid mtd-device via module parameter\n");
193 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
197 pr_info("MTD device: %d\n", dev
);
198 pr_info("torture %d eraseblocks (%d-%d) of mtd%d\n",
199 ebcnt
, eb
, eb
+ ebcnt
- 1, dev
);
201 pr_info("torturing just %d pages per eraseblock\n",
203 pr_info("write verify %s\n", check
? "enabled" : "disabled");
205 mtd
= get_mtd_device(NULL
, dev
);
208 pr_err("error: cannot get MTD device\n");
212 if (mtd
->writesize
== 1) {
213 pr_info("not NAND flash, assume page size is 512 "
217 pgsize
= mtd
->writesize
;
219 if (pgcnt
&& (pgcnt
> mtd
->erasesize
/ pgsize
|| pgcnt
< 0)) {
220 pr_err("error: invalid pgcnt value %d\n", pgcnt
);
225 patt_5A5
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
229 patt_A5A
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
233 patt_FF
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
237 check_buf
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
241 bad_ebs
= kzalloc(ebcnt
, GFP_KERNEL
);
247 /* Initialize patterns */
248 memset(patt_FF
, 0xFF, mtd
->erasesize
);
249 for (i
= 0; i
< mtd
->erasesize
/ pgsize
; i
++) {
251 memset(patt_5A5
+ i
* pgsize
, 0x55, pgsize
);
252 memset(patt_A5A
+ i
* pgsize
, 0xAA, pgsize
);
254 memset(patt_5A5
+ i
* pgsize
, 0xAA, pgsize
);
255 memset(patt_A5A
+ i
* pgsize
, 0x55, pgsize
);
259 err
= mtdtest_scan_for_bad_eraseblocks(mtd
, bad_ebs
, eb
, ebcnt
);
268 err
= mtdtest_erase_good_eraseblocks(mtd
, bad_ebs
, eb
, ebcnt
);
272 /* Check if the eraseblocks contain only 0xFF bytes */
274 for (i
= eb
; i
< eb
+ ebcnt
; i
++) {
277 err
= check_eraseblock(i
, patt_FF
);
279 pr_info("verify failed"
280 " for 0xFF... pattern\n");
284 err
= mtdtest_relax();
290 /* Write the pattern */
291 for (i
= eb
; i
< eb
+ ebcnt
; i
++) {
294 if ((eb
+ erase_cycles
) & 1)
298 err
= write_pattern(i
, patt
);
302 err
= mtdtest_relax();
307 /* Verify what we wrote */
309 for (i
= eb
; i
< eb
+ ebcnt
; i
++) {
312 if ((eb
+ erase_cycles
) & 1)
316 err
= check_eraseblock(i
, patt
);
318 pr_info("verify failed for %s"
320 ((eb
+ erase_cycles
) & 1) ?
321 "0x55AA55..." : "0xAA55AA...");
325 err
= mtdtest_relax();
333 if (erase_cycles
% gran
== 0) {
337 ms
= ktime_ms_delta(finish
, start
);
338 pr_info("%08u erase cycles done, took %lu "
339 "milliseconds (%lu seconds)\n",
340 erase_cycles
, ms
, ms
/ 1000);
344 if (!infinite
&& --cycles_count
== 0)
349 pr_info("finished after %u erase cycles\n",
363 pr_info("error %d occurred during torturing\n", err
);
364 printk(KERN_INFO
"=================================================\n");
367 module_init(tort_init
);
369 static void __exit
tort_exit(void)
373 module_exit(tort_exit
);
375 static int countdiffs(unsigned char *buf
, unsigned char *check_buf
,
376 unsigned offset
, unsigned len
, unsigned *bytesp
,
378 static void print_bufs(unsigned char *read
, unsigned char *written
, int start
,
382 * Report the detailed information about how the read EB differs from what was
385 static void report_corrupt(unsigned char *read
, unsigned char *written
)
388 int bytes
, bits
, pages
, first
;
390 size_t check_len
= mtd
->erasesize
;
393 check_len
= pgcnt
* pgsize
;
395 bytes
= bits
= pages
= 0;
396 for (i
= 0; i
< check_len
; i
+= pgsize
)
397 if (countdiffs(written
, read
, i
, pgsize
, &bytes
,
401 pr_info("verify fails on %d pages, %d bytes/%d bits\n",
403 pr_info("The following is a list of all differences between"
404 " what was read from flash and what was expected\n");
406 for (i
= 0; i
< check_len
; i
+= pgsize
) {
409 first
= countdiffs(written
, read
, i
, pgsize
, &bytes
,
414 printk("-------------------------------------------------------"
415 "----------------------------------\n");
417 pr_info("Page %zd has %d bytes/%d bits failing verify,"
418 " starting at offset 0x%x\n",
419 (mtd
->erasesize
- check_len
+ i
) / pgsize
,
422 offset
= first
& ~0x7;
423 len
= ((first
+ bytes
) | 0x7) + 1 - offset
;
425 print_bufs(read
, written
, offset
, len
);
429 static void print_bufs(unsigned char *read
, unsigned char *written
, int start
,
435 printk("Offset Read Written\n");
437 printk("0x%08x: ", start
+ i
);
439 for (j1
= 0; j1
< 8 && i
+ j1
< len
; j1
++) {
440 printk(" %02x", read
[start
+ i
+ j1
]);
441 if (read
[start
+ i
+ j1
] != written
[start
+ i
+ j1
])
450 printk(" %s ", diff
);
452 for (j2
= 0; j2
< 8 && i
+ j2
< len
; j2
++)
453 printk(" %02x", written
[start
+ i
+ j2
]);
460 * Count the number of differing bytes and bits and return the first differing
463 static int countdiffs(unsigned char *buf
, unsigned char *check_buf
,
464 unsigned offset
, unsigned len
, unsigned *bytesp
,
470 for (i
= offset
; i
< offset
+ len
; i
++)
471 if (buf
[i
] != check_buf
[i
]) {
476 while (i
< offset
+ len
) {
477 if (buf
[i
] != check_buf
[i
]) {
481 if ((buf
[i
] & bit
) != (check_buf
[i
] & bit
))
492 MODULE_DESCRIPTION("Eraseblock torturing module");
493 MODULE_AUTHOR("Artem Bityutskiy, Jarkko Lavinen, Adrian Hunter");
494 MODULE_LICENSE("GPL");