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 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/err.h>
30 #include <linux/mtd/mtd.h>
31 #include <linux/slab.h>
32 #include <linux/sched.h>
34 #define PRINT_PREF KERN_INFO "mtd_torturetest: "
38 module_param(eb
, int, S_IRUGO
);
39 MODULE_PARM_DESC(eb
, "eraseblock number within the selected MTD device");
41 static int ebcnt
= 32;
42 module_param(ebcnt
, int, S_IRUGO
);
43 MODULE_PARM_DESC(ebcnt
, "number of consecutive eraseblocks to torture");
46 module_param(pgcnt
, int, S_IRUGO
);
47 MODULE_PARM_DESC(pgcnt
, "number of pages per eraseblock to torture (0 => all)");
50 module_param(dev
, int, S_IRUGO
);
51 MODULE_PARM_DESC(dev
, "MTD device number to use");
53 static int gran
= 512;
54 module_param(gran
, int, S_IRUGO
);
55 MODULE_PARM_DESC(gran
, "how often the status information should be printed");
58 module_param(check
, int, S_IRUGO
);
59 MODULE_PARM_DESC(check
, "if the written data should be checked");
61 static unsigned int cycles_count
;
62 module_param(cycles_count
, uint
, S_IRUGO
);
63 MODULE_PARM_DESC(cycles_count
, "how many erase cycles to do "
64 "(infinite by default)");
66 static struct mtd_info
*mtd
;
68 /* This buffer contains 0x555555...0xAAAAAA... pattern */
69 static unsigned char *patt_5A5
;
70 /* This buffer contains 0xAAAAAA...0x555555... pattern */
71 static unsigned char *patt_A5A
;
72 /* This buffer contains all 0xFF bytes */
73 static unsigned char *patt_FF
;
74 /* This a temporary buffer is use when checking data */
75 static unsigned char *check_buf
;
76 /* How many erase cycles were done */
77 static unsigned int erase_cycles
;
80 static struct timeval start
, finish
;
82 static void report_corrupt(unsigned char *read
, unsigned char *written
);
84 static inline void start_timing(void)
86 do_gettimeofday(&start
);
89 static inline void stop_timing(void)
91 do_gettimeofday(&finish
);
95 * Erase eraseblock number @ebnum.
97 static inline int erase_eraseblock(int ebnum
)
100 struct erase_info ei
;
101 loff_t addr
= ebnum
* mtd
->erasesize
;
103 memset(&ei
, 0, sizeof(struct erase_info
));
106 ei
.len
= mtd
->erasesize
;
108 err
= mtd
->erase(mtd
, &ei
);
110 printk(PRINT_PREF
"error %d while erasing EB %d\n", err
, ebnum
);
114 if (ei
.state
== MTD_ERASE_FAILED
) {
115 printk(PRINT_PREF
"some erase error occurred at EB %d\n",
124 * Check that the contents of eraseblock number @enbum is equivalent to the
127 static inline int check_eraseblock(int ebnum
, unsigned char *buf
)
129 int err
, retries
= 0;
131 loff_t addr
= ebnum
* mtd
->erasesize
;
132 size_t len
= mtd
->erasesize
;
135 addr
= (ebnum
+ 1) * mtd
->erasesize
- pgcnt
* pgsize
;
136 len
= pgcnt
* pgsize
;
140 err
= mtd
->read(mtd
, addr
, len
, &read
, check_buf
);
142 printk(PRINT_PREF
"single bit flip occurred at EB %d "
143 "MTD reported that it was fixed.\n", ebnum
);
145 printk(PRINT_PREF
"error %d while reading EB %d, "
146 "read %zd\n", err
, ebnum
, read
);
151 printk(PRINT_PREF
"failed to read %zd bytes from EB %d, "
152 "read only %zd, but no error reported\n",
157 if (memcmp(buf
, check_buf
, len
)) {
158 printk(PRINT_PREF
"read wrong data from EB %d\n", ebnum
);
159 report_corrupt(check_buf
, buf
);
161 if (retries
++ < RETRIES
) {
164 printk(PRINT_PREF
"re-try reading data from EB %d\n",
168 printk(PRINT_PREF
"retried %d times, still errors, "
169 "give-up\n", RETRIES
);
175 printk(PRINT_PREF
"only attempt number %d was OK (!!!)\n",
181 static inline int write_pattern(int ebnum
, void *buf
)
185 loff_t addr
= ebnum
* mtd
->erasesize
;
186 size_t len
= mtd
->erasesize
;
189 addr
= (ebnum
+ 1) * mtd
->erasesize
- pgcnt
* pgsize
;
190 len
= pgcnt
* pgsize
;
192 err
= mtd
->write(mtd
, addr
, len
, &written
, buf
);
194 printk(PRINT_PREF
"error %d while writing EB %d, written %zd"
195 " bytes\n", err
, ebnum
, written
);
198 if (written
!= len
) {
199 printk(PRINT_PREF
"written only %zd bytes of %zd, but no error"
200 " reported\n", written
, len
);
207 static int __init
tort_init(void)
209 int err
= 0, i
, infinite
= !cycles_count
;
212 printk(KERN_INFO
"\n");
213 printk(KERN_INFO
"=================================================\n");
214 printk(PRINT_PREF
"Warning: this program is trying to wear out your "
215 "flash, stop it if this is not wanted.\n");
216 printk(PRINT_PREF
"MTD device: %d\n", dev
);
217 printk(PRINT_PREF
"torture %d eraseblocks (%d-%d) of mtd%d\n",
218 ebcnt
, eb
, eb
+ ebcnt
- 1, dev
);
220 printk(PRINT_PREF
"torturing just %d pages per eraseblock\n",
222 printk(PRINT_PREF
"write verify %s\n", check
? "enabled" : "disabled");
224 mtd
= get_mtd_device(NULL
, dev
);
227 printk(PRINT_PREF
"error: cannot get MTD device\n");
231 if (mtd
->writesize
== 1) {
232 printk(PRINT_PREF
"not NAND flash, assume page size is 512 "
236 pgsize
= mtd
->writesize
;
238 if (pgcnt
&& (pgcnt
> mtd
->erasesize
/ pgsize
|| pgcnt
< 0)) {
239 printk(PRINT_PREF
"error: invalid pgcnt value %d\n", pgcnt
);
244 patt_5A5
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
246 printk(PRINT_PREF
"error: cannot allocate memory\n");
250 patt_A5A
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
252 printk(PRINT_PREF
"error: cannot allocate memory\n");
256 patt_FF
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
258 printk(PRINT_PREF
"error: cannot allocate memory\n");
262 check_buf
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
264 printk(PRINT_PREF
"error: cannot allocate memory\n");
270 /* Initialize patterns */
271 memset(patt_FF
, 0xFF, mtd
->erasesize
);
272 for (i
= 0; i
< mtd
->erasesize
/ pgsize
; i
++) {
274 memset(patt_5A5
+ i
* pgsize
, 0x55, pgsize
);
275 memset(patt_A5A
+ i
* pgsize
, 0xAA, pgsize
);
277 memset(patt_5A5
+ i
* pgsize
, 0xAA, pgsize
);
278 memset(patt_A5A
+ i
* pgsize
, 0x55, pgsize
);
283 * Check if there is a bad eraseblock among those we are going to test.
285 memset(&bad_ebs
[0], 0, sizeof(int) * ebcnt
);
286 if (mtd
->block_isbad
) {
287 for (i
= eb
; i
< eb
+ ebcnt
; i
++) {
288 err
= mtd
->block_isbad(mtd
,
289 (loff_t
)i
* mtd
->erasesize
);
292 printk(PRINT_PREF
"block_isbad() returned %d "
293 "for EB %d\n", err
, i
);
298 printk("EB %d is bad. Skip it.\n", i
);
309 /* Erase all eraseblocks */
310 for (i
= eb
; i
< eb
+ ebcnt
; i
++) {
313 err
= erase_eraseblock(i
);
319 /* Check if the eraseblocks contain only 0xFF bytes */
321 for (i
= eb
; i
< eb
+ ebcnt
; i
++) {
324 err
= check_eraseblock(i
, patt_FF
);
326 printk(PRINT_PREF
"verify failed"
327 " for 0xFF... pattern\n");
334 /* Write the pattern */
335 for (i
= eb
; i
< eb
+ ebcnt
; i
++) {
338 if ((eb
+ erase_cycles
) & 1)
342 err
= write_pattern(i
, patt
);
348 /* Verify what we wrote */
350 for (i
= eb
; i
< eb
+ ebcnt
; i
++) {
353 if ((eb
+ erase_cycles
) & 1)
357 err
= check_eraseblock(i
, patt
);
359 printk(PRINT_PREF
"verify failed for %s"
361 ((eb
+ erase_cycles
) & 1) ?
362 "0x55AA55..." : "0xAA55AA...");
371 if (erase_cycles
% gran
== 0) {
375 ms
= (finish
.tv_sec
- start
.tv_sec
) * 1000 +
376 (finish
.tv_usec
- start
.tv_usec
) / 1000;
377 printk(PRINT_PREF
"%08u erase cycles done, took %lu "
378 "milliseconds (%lu seconds)\n",
379 erase_cycles
, ms
, ms
/ 1000);
383 if (!infinite
&& --cycles_count
== 0)
388 printk(PRINT_PREF
"finished after %u erase cycles\n",
400 printk(PRINT_PREF
"error %d occurred during torturing\n", err
);
401 printk(KERN_INFO
"=================================================\n");
404 module_init(tort_init
);
406 static void __exit
tort_exit(void)
410 module_exit(tort_exit
);
412 static int countdiffs(unsigned char *buf
, unsigned char *check_buf
,
413 unsigned offset
, unsigned len
, unsigned *bytesp
,
415 static void print_bufs(unsigned char *read
, unsigned char *written
, int start
,
419 * Report the detailed information about how the read EB differs from what was
422 static void report_corrupt(unsigned char *read
, unsigned char *written
)
425 int bytes
, bits
, pages
, first
;
427 size_t check_len
= mtd
->erasesize
;
430 check_len
= pgcnt
* pgsize
;
432 bytes
= bits
= pages
= 0;
433 for (i
= 0; i
< check_len
; i
+= pgsize
)
434 if (countdiffs(written
, read
, i
, pgsize
, &bytes
,
438 printk(PRINT_PREF
"verify fails on %d pages, %d bytes/%d bits\n",
440 printk(PRINT_PREF
"The following is a list of all differences between"
441 " what was read from flash and what was expected\n");
443 for (i
= 0; i
< check_len
; i
+= pgsize
) {
446 first
= countdiffs(written
, read
, i
, pgsize
, &bytes
,
451 printk("-------------------------------------------------------"
452 "----------------------------------\n");
454 printk(PRINT_PREF
"Page %zd has %d bytes/%d bits failing verify,"
455 " starting at offset 0x%x\n",
456 (mtd
->erasesize
- check_len
+ i
) / pgsize
,
459 offset
= first
& ~0x7;
460 len
= ((first
+ bytes
) | 0x7) + 1 - offset
;
462 print_bufs(read
, written
, offset
, len
);
466 static void print_bufs(unsigned char *read
, unsigned char *written
, int start
,
472 printk("Offset Read Written\n");
474 printk("0x%08x: ", start
+ i
);
476 for (j1
= 0; j1
< 8 && i
+ j1
< len
; j1
++) {
477 printk(" %02x", read
[start
+ i
+ j1
]);
478 if (read
[start
+ i
+ j1
] != written
[start
+ i
+ j1
])
487 printk(" %s ", diff
);
489 for (j2
= 0; j2
< 8 && i
+ j2
< len
; j2
++)
490 printk(" %02x", written
[start
+ i
+ j2
]);
497 * Count the number of differing bytes and bits and return the first differing
500 static int countdiffs(unsigned char *buf
, unsigned char *check_buf
,
501 unsigned offset
, unsigned len
, unsigned *bytesp
,
507 for (i
= offset
; i
< offset
+ len
; i
++)
508 if (buf
[i
] != check_buf
[i
]) {
513 while (i
< offset
+ len
) {
514 if (buf
[i
] != check_buf
[i
]) {
518 if ((buf
[i
] & bit
) != (check_buf
[i
] & bit
))
529 MODULE_DESCRIPTION("Eraseblock torturing module");
530 MODULE_AUTHOR("Artem Bityutskiy, Jarkko Lavinen, Adrian Hunter");
531 MODULE_LICENSE("GPL");
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