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linux/drivers/mtd/tests/mtd_oobtest.c
Wolfram Sang 7406060e29 mtd: tests: don't use mtd0 as a default 
mtd tests may erase the mtd device, so force the user to specify which
mtd device to test by using the module parameter. Disable the default
(using mtd0) since this may destroy a vital part of the flash if the
module is inserted accidently or carelessly.

Reported-by: Roland Kletzing <devzero@web.de>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@intel.com>
2011-10-30 14:31:04 +02:00

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/*
* 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 OOB read and write on MTD device.
*
* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
*/
#include <asm/div64.h>
#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_oobtest: "
static int dev = -EINVAL;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");
static struct mtd_info *mtd;
static unsigned char *readbuf;
static unsigned char *writebuf;
static unsigned char *bbt;
static int ebcnt;
static int pgcnt;
static int errcnt;
static int use_offset;
static int use_len;
static int use_len_max;
static int vary_offset;
static unsigned long next = 1;
static inline unsigned int simple_rand(void)
{
next = next * 1103515245 + 12345;
return (unsigned int)((next / 65536) % 32768);
}
static inline void simple_srand(unsigned long seed)
{
next = seed;
}
static void set_random_data(unsigned char *buf, size_t len)
{
size_t i;
for (i = 0; i < len; ++i)
buf[i] = simple_rand();
}
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 (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;
}
static int erase_whole_device(void)
{
int err;
unsigned int i;
printk(PRINT_PREF "erasing whole device\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = erase_eraseblock(i);
if (err)
return err;
cond_resched();
}
printk(PRINT_PREF "erased %u eraseblocks\n", i);
return 0;
}
static void do_vary_offset(void)
{
use_len -= 1;
if (use_len < 1) {
use_offset += 1;
if (use_offset >= use_len_max)
use_offset = 0;
use_len = use_len_max - use_offset;
}
}
static int write_eraseblock(int ebnum)
{
int i;
struct mtd_oob_ops ops;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
set_random_data(writebuf, use_len);
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = use_len;
ops.oobretlen = 0;
ops.ooboffs = use_offset;
ops.datbuf = NULL;
ops.oobbuf = writebuf;
err = mtd->write_oob(mtd, addr, &ops);
if (err || ops.oobretlen != use_len) {
printk(PRINT_PREF "error: writeoob failed at %#llx\n",
(long long)addr);
printk(PRINT_PREF "error: use_len %d, use_offset %d\n",
use_len, use_offset);
errcnt += 1;
return err ? err : -1;
}
if (vary_offset)
do_vary_offset();
}
return err;
}
static int write_whole_device(void)
{
int err;
unsigned int i;
printk(PRINT_PREF "writing OOBs of whole device\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = write_eraseblock(i);
if (err)
return err;
if (i % 256 == 0)
printk(PRINT_PREF "written up to eraseblock %u\n", i);
cond_resched();
}
printk(PRINT_PREF "written %u eraseblocks\n", i);
return 0;
}
static int verify_eraseblock(int ebnum)
{
int i;
struct mtd_oob_ops ops;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
set_random_data(writebuf, use_len);
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = use_len;
ops.oobretlen = 0;
ops.ooboffs = use_offset;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
err = mtd->read_oob(mtd, addr, &ops);
if (err || ops.oobretlen != use_len) {
printk(PRINT_PREF "error: readoob failed at %#llx\n",
(long long)addr);
errcnt += 1;
return err ? err : -1;
}
if (memcmp(readbuf, writebuf, use_len)) {
printk(PRINT_PREF "error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
printk(PRINT_PREF "error: too many errors\n");
return -1;
}
}
if (use_offset != 0 || use_len < mtd->ecclayout->oobavail) {
int k;
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = mtd->ecclayout->oobavail;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
err = mtd->read_oob(mtd, addr, &ops);
if (err || ops.oobretlen != mtd->ecclayout->oobavail) {
printk(PRINT_PREF "error: readoob failed at "
"%#llx\n", (long long)addr);
errcnt += 1;
return err ? err : -1;
}
if (memcmp(readbuf + use_offset, writebuf, use_len)) {
printk(PRINT_PREF "error: verify failed at "
"%#llx\n", (long long)addr);
errcnt += 1;
if (errcnt > 1000) {
printk(PRINT_PREF "error: too many "
"errors\n");
return -1;
}
}
for (k = 0; k < use_offset; ++k)
if (readbuf[k] != 0xff) {
printk(PRINT_PREF "error: verify 0xff "
"failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
printk(PRINT_PREF "error: too "
"many errors\n");
return -1;
}
}
for (k = use_offset + use_len;
k < mtd->ecclayout->oobavail; ++k)
if (readbuf[k] != 0xff) {
printk(PRINT_PREF "error: verify 0xff "
"failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
printk(PRINT_PREF "error: too "
"many errors\n");
return -1;
}
}
}
if (vary_offset)
do_vary_offset();
}
return err;
}
static int verify_eraseblock_in_one_go(int ebnum)
{
struct mtd_oob_ops ops;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
size_t len = mtd->ecclayout->oobavail * pgcnt;
set_random_data(writebuf, len);
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = len;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
err = mtd->read_oob(mtd, addr, &ops);
if (err || ops.oobretlen != len) {
printk(PRINT_PREF "error: readoob failed at %#llx\n",
(long long)addr);
errcnt += 1;
return err ? err : -1;
}
if (memcmp(readbuf, writebuf, len)) {
printk(PRINT_PREF "error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
printk(PRINT_PREF "error: too many errors\n");
return -1;
}
}
return err;
}
static int verify_all_eraseblocks(void)
{
int err;
unsigned int i;
printk(PRINT_PREF "verifying all eraseblocks\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = verify_eraseblock(i);
if (err)
return err;
if (i % 256 == 0)
printk(PRINT_PREF "verified up to eraseblock %u\n", i);
cond_resched();
}
printk(PRINT_PREF "verified %u eraseblocks\n", i);
return 0;
}
static int is_block_bad(int ebnum)
{
int ret;
loff_t addr = ebnum * mtd->erasesize;
ret = mtd->block_isbad(mtd, addr);
if (ret)
printk(PRINT_PREF "block %d is bad\n", ebnum);
return ret;
}
static int scan_for_bad_eraseblocks(void)
{
int i, bad = 0;
bbt = kmalloc(ebcnt, GFP_KERNEL);
if (!bbt) {
printk(PRINT_PREF "error: cannot allocate memory\n");
return -ENOMEM;
}
printk(PRINT_PREF "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();
}
printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
return 0;
}
static int __init mtd_oobtest_init(void)
{
int err = 0;
unsigned int i;
uint64_t tmp;
struct mtd_oob_ops ops;
loff_t addr = 0, addr0;
printk(KERN_INFO "\n");
printk(KERN_INFO "=================================================\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);
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->type != MTD_NANDFLASH) {
printk(PRINT_PREF "this test requires NAND flash\n");
goto out;
}
tmp = mtd->size;
do_div(tmp, mtd->erasesize);
ebcnt = tmp;
pgcnt = mtd->erasesize / mtd->writesize;
printk(PRINT_PREF "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,
mtd->writesize, ebcnt, pgcnt, mtd->oobsize);
err = -ENOMEM;
readbuf = kmalloc(mtd->erasesize, GFP_KERNEL);
if (!readbuf) {
printk(PRINT_PREF "error: cannot allocate memory\n");
goto out;
}
writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
if (!writebuf) {
printk(PRINT_PREF "error: cannot allocate memory\n");
goto out;
}
err = scan_for_bad_eraseblocks();
if (err)
goto out;
use_offset = 0;
use_len = mtd->ecclayout->oobavail;
use_len_max = mtd->ecclayout->oobavail;
vary_offset = 0;
/* First test: write all OOB, read it back and verify */
printk(PRINT_PREF "test 1 of 5\n");
err = erase_whole_device();
if (err)
goto out;
simple_srand(1);
err = write_whole_device();
if (err)
goto out;
simple_srand(1);
err = verify_all_eraseblocks();
if (err)
goto out;
/*
* Second test: write all OOB, a block at a time, read it back and
* verify.
*/
printk(PRINT_PREF "test 2 of 5\n");
err = erase_whole_device();
if (err)
goto out;
simple_srand(3);
err = write_whole_device();
if (err)
goto out;
/* Check all eraseblocks */
simple_srand(3);
printk(PRINT_PREF "verifying all eraseblocks\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = verify_eraseblock_in_one_go(i);
if (err)
goto out;
if (i % 256 == 0)
printk(PRINT_PREF "verified up to eraseblock %u\n", i);
cond_resched();
}
printk(PRINT_PREF "verified %u eraseblocks\n", i);
/*
* Third test: write OOB at varying offsets and lengths, read it back
* and verify.
*/
printk(PRINT_PREF "test 3 of 5\n");
err = erase_whole_device();
if (err)
goto out;
/* Write all eraseblocks */
use_offset = 0;
use_len = mtd->ecclayout->oobavail;
use_len_max = mtd->ecclayout->oobavail;
vary_offset = 1;
simple_srand(5);
err = write_whole_device();
if (err)
goto out;
/* Check all eraseblocks */
use_offset = 0;
use_len = mtd->ecclayout->oobavail;
use_len_max = mtd->ecclayout->oobavail;
vary_offset = 1;
simple_srand(5);
err = verify_all_eraseblocks();
if (err)
goto out;
use_offset = 0;
use_len = mtd->ecclayout->oobavail;
use_len_max = mtd->ecclayout->oobavail;
vary_offset = 0;
/* Fourth test: try to write off end of device */
printk(PRINT_PREF "test 4 of 5\n");
err = erase_whole_device();
if (err)
goto out;
addr0 = 0;
for (i = 0; i < ebcnt && bbt[i]; ++i)
addr0 += mtd->erasesize;
/* Attempt to write off end of OOB */
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = 1;
ops.oobretlen = 0;
ops.ooboffs = mtd->ecclayout->oobavail;
ops.datbuf = NULL;
ops.oobbuf = writebuf;
printk(PRINT_PREF "attempting to start write past end of OOB\n");
printk(PRINT_PREF "an error is expected...\n");
err = mtd->write_oob(mtd, addr0, &ops);
if (err) {
printk(PRINT_PREF "error occurred as expected\n");
err = 0;
} else {
printk(PRINT_PREF "error: can write past end of OOB\n");
errcnt += 1;
}
/* Attempt to read off end of OOB */
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = 1;
ops.oobretlen = 0;
ops.ooboffs = mtd->ecclayout->oobavail;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
printk(PRINT_PREF "attempting to start read past end of OOB\n");
printk(PRINT_PREF "an error is expected...\n");
err = mtd->read_oob(mtd, addr0, &ops);
if (err) {
printk(PRINT_PREF "error occurred as expected\n");
err = 0;
} else {
printk(PRINT_PREF "error: can read past end of OOB\n");
errcnt += 1;
}
if (bbt[ebcnt - 1])
printk(PRINT_PREF "skipping end of device tests because last "
"block is bad\n");
else {
/* Attempt to write off end of device */
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = mtd->ecclayout->oobavail + 1;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = NULL;
ops.oobbuf = writebuf;
printk(PRINT_PREF "attempting to write past end of device\n");
printk(PRINT_PREF "an error is expected...\n");
err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops);
if (err) {
printk(PRINT_PREF "error occurred as expected\n");
err = 0;
} else {
printk(PRINT_PREF "error: wrote past end of device\n");
errcnt += 1;
}
/* Attempt to read off end of device */
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = mtd->ecclayout->oobavail + 1;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
printk(PRINT_PREF "attempting to read past end of device\n");
printk(PRINT_PREF "an error is expected...\n");
err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops);
if (err) {
printk(PRINT_PREF "error occurred as expected\n");
err = 0;
} else {
printk(PRINT_PREF "error: read past end of device\n");
errcnt += 1;
}
err = erase_eraseblock(ebcnt - 1);
if (err)
goto out;
/* Attempt to write off end of device */
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = mtd->ecclayout->oobavail;
ops.oobretlen = 0;
ops.ooboffs = 1;
ops.datbuf = NULL;
ops.oobbuf = writebuf;
printk(PRINT_PREF "attempting to write past end of device\n");
printk(PRINT_PREF "an error is expected...\n");
err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops);
if (err) {
printk(PRINT_PREF "error occurred as expected\n");
err = 0;
} else {
printk(PRINT_PREF "error: wrote past end of device\n");
errcnt += 1;
}
/* Attempt to read off end of device */
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = mtd->ecclayout->oobavail;
ops.oobretlen = 0;
ops.ooboffs = 1;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
printk(PRINT_PREF "attempting to read past end of device\n");
printk(PRINT_PREF "an error is expected...\n");
err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops);
if (err) {
printk(PRINT_PREF "error occurred as expected\n");
err = 0;
} else {
printk(PRINT_PREF "error: read past end of device\n");
errcnt += 1;
}
}
/* Fifth test: write / read across block boundaries */
printk(PRINT_PREF "test 5 of 5\n");
/* Erase all eraseblocks */
err = erase_whole_device();
if (err)
goto out;
/* Write all eraseblocks */
simple_srand(11);
printk(PRINT_PREF "writing OOBs of whole device\n");
for (i = 0; i < ebcnt - 1; ++i) {
int cnt = 2;
int pg;
size_t sz = mtd->ecclayout->oobavail;
if (bbt[i] || bbt[i + 1])
continue;
addr = (i + 1) * mtd->erasesize - mtd->writesize;
for (pg = 0; pg < cnt; ++pg) {
set_random_data(writebuf, sz);
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = sz;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = NULL;
ops.oobbuf = writebuf;
err = mtd->write_oob(mtd, addr, &ops);
if (err)
goto out;
if (i % 256 == 0)
printk(PRINT_PREF "written up to eraseblock "
"%u\n", i);
cond_resched();
addr += mtd->writesize;
}
}
printk(PRINT_PREF "written %u eraseblocks\n", i);
/* Check all eraseblocks */
simple_srand(11);
printk(PRINT_PREF "verifying all eraseblocks\n");
for (i = 0; i < ebcnt - 1; ++i) {
if (bbt[i] || bbt[i + 1])
continue;
set_random_data(writebuf, mtd->ecclayout->oobavail * 2);
addr = (i + 1) * mtd->erasesize - mtd->writesize;
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = mtd->ecclayout->oobavail * 2;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
err = mtd->read_oob(mtd, addr, &ops);
if (err)
goto out;
if (memcmp(readbuf, writebuf, mtd->ecclayout->oobavail * 2)) {
printk(PRINT_PREF "error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
printk(PRINT_PREF "error: too many errors\n");
goto out;
}
}
if (i % 256 == 0)
printk(PRINT_PREF "verified up to eraseblock %u\n", i);
cond_resched();
}
printk(PRINT_PREF "verified %u eraseblocks\n", i);
printk(PRINT_PREF "finished with %d errors\n", errcnt);
out:
kfree(bbt);
kfree(writebuf);
kfree(readbuf);
put_mtd_device(mtd);
if (err)
printk(PRINT_PREF "error %d occurred\n", err);
printk(KERN_INFO "=================================================\n");
return err;
}
module_init(mtd_oobtest_init);
static void __exit mtd_oobtest_exit(void)
{
return;
}
module_exit(mtd_oobtest_exit);
MODULE_DESCRIPTION("Out-of-band test module");
MODULE_AUTHOR("Adrian Hunter");
MODULE_LICENSE("GPL");
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