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linux/drivers/mtd/tests/oobtest.c
Akinobu Mita be54f8f1c7 mtd: mtd_oobtest: generate consistent data for verification 
mtd_oobtest writes OOB, read it back and verify.  The verification is
not correctly done if oobsize is not multiple of 4.  Although the data
to be written and the data to be compared are generated by several
prandom_byte_state() calls starting with the same seed, these two are
generated with the different size and different number of calls.

Due to the implementation of prandom_byte_state() if the size on each
call is not multiple of 4, the resulting data is not always same.

This fixes it by just calling prandom_byte_state() once and using
correct range instead of calling it multiple times for each.

Reported-by: George Cherian <george.cherian@ti.com>
Reported-by: Lothar Waßmann <LW@KARO-electronics.de>
Tested-by: Lothar Waßmann <LW@KARO-electronics.de>
Cc: George Cherian <george.cherian@ti.com>
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2014-04-17 22:22:03 -07:00

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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>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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>
#include <linux/random.h>
#include "mtd_test.h"
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 struct rnd_state rnd_state;
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;
prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
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 + (use_len_max * i) + use_offset;
err = mtd_write_oob(mtd, addr, &ops);
if (err || ops.oobretlen != use_len) {
pr_err("error: writeoob failed at %#llx\n",
(long long)addr);
pr_err("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;
pr_info("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)
pr_info("written up to eraseblock %u\n", i);
cond_resched();
}
pr_info("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;
prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
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) {
pr_err("error: readoob failed at %#llx\n",
(long long)addr);
errcnt += 1;
return err ? err : -1;
}
if (memcmp(readbuf, writebuf + (use_len_max * i) + use_offset,
use_len)) {
pr_err("error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
pr_err("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) {
pr_err("error: readoob failed at %#llx\n",
(long long)addr);
errcnt += 1;
return err ? err : -1;
}
if (memcmp(readbuf + use_offset,
writebuf + (use_len_max * i) + use_offset,
use_len)) {
pr_err("error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
pr_err("error: too many errors\n");
return -1;
}
}
for (k = 0; k < use_offset; ++k)
if (readbuf[k] != 0xff) {
pr_err("error: verify 0xff "
"failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
pr_err("error: too "
"many errors\n");
return -1;
}
}
for (k = use_offset + use_len;
k < mtd->ecclayout->oobavail; ++k)
if (readbuf[k] != 0xff) {
pr_err("error: verify 0xff "
"failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
pr_err("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;
prandom_bytes_state(&rnd_state, 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) {
pr_err("error: readoob failed at %#llx\n",
(long long)addr);
errcnt += 1;
return err ? err : -1;
}
if (memcmp(readbuf, writebuf, len)) {
pr_err("error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
pr_err("error: too many errors\n");
return -1;
}
}
return err;
}
static int verify_all_eraseblocks(void)
{
int err;
unsigned int i;
pr_info("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)
pr_info("verified up to eraseblock %u\n", i);
cond_resched();
}
pr_info("verified %u eraseblocks\n", i);
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) {
pr_info("Please specify a valid mtd-device via module parameter\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_type_is_nand(mtd)) {
pr_info("this test requires NAND flash\n");
goto out;
}
tmp = mtd->size;
do_div(tmp, mtd->erasesize);
ebcnt = tmp;
pgcnt = mtd->erasesize / mtd->writesize;
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,
mtd->writesize, ebcnt, pgcnt, mtd->oobsize);
err = -ENOMEM;
readbuf = kmalloc(mtd->erasesize, GFP_KERNEL);
if (!readbuf)
goto out;
writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
if (!writebuf)
goto out;
bbt = kzalloc(ebcnt, GFP_KERNEL);
if (!bbt)
goto out;
err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
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 */
pr_info("test 1 of 5\n");
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
prandom_seed_state(&rnd_state, 1);
err = write_whole_device();
if (err)
goto out;
prandom_seed_state(&rnd_state, 1);
err = verify_all_eraseblocks();
if (err)
goto out;
/*
* Second test: write all OOB, a block at a time, read it back and
* verify.
*/
pr_info("test 2 of 5\n");
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
prandom_seed_state(&rnd_state, 3);
err = write_whole_device();
if (err)
goto out;
/* Check all eraseblocks */
prandom_seed_state(&rnd_state, 3);
pr_info("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)
pr_info("verified up to eraseblock %u\n", i);
cond_resched();
}
pr_info("verified %u eraseblocks\n", i);
/*
* Third test: write OOB at varying offsets and lengths, read it back
* and verify.
*/
pr_info("test 3 of 5\n");
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
/* Write all eraseblocks */
use_offset = 0;
use_len = mtd->ecclayout->oobavail;
use_len_max = mtd->ecclayout->oobavail;
vary_offset = 1;
prandom_seed_state(&rnd_state, 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;
prandom_seed_state(&rnd_state, 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 */
pr_info("test 4 of 5\n");
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
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;
pr_info("attempting to start write past end of OOB\n");
pr_info("an error is expected...\n");
err = mtd_write_oob(mtd, addr0, &ops);
if (err) {
pr_info("error occurred as expected\n");
err = 0;
} else {
pr_err("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;
pr_info("attempting to start read past end of OOB\n");
pr_info("an error is expected...\n");
err = mtd_read_oob(mtd, addr0, &ops);
if (err) {
pr_info("error occurred as expected\n");
err = 0;
} else {
pr_err("error: can read past end of OOB\n");
errcnt += 1;
}
if (bbt[ebcnt - 1])
pr_info("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;
pr_info("attempting to write past end of device\n");
pr_info("an error is expected...\n");
err = mtd_write_oob(mtd, mtd->size - mtd->writesize, &ops);
if (err) {
pr_info("error occurred as expected\n");
err = 0;
} else {
pr_err("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;
pr_info("attempting to read past end of device\n");
pr_info("an error is expected...\n");
err = mtd_read_oob(mtd, mtd->size - mtd->writesize, &ops);
if (err) {
pr_info("error occurred as expected\n");
err = 0;
} else {
pr_err("error: read past end of device\n");
errcnt += 1;
}
err = mtdtest_erase_eraseblock(mtd, 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;
pr_info("attempting to write past end of device\n");
pr_info("an error is expected...\n");
err = mtd_write_oob(mtd, mtd->size - mtd->writesize, &ops);
if (err) {
pr_info("error occurred as expected\n");
err = 0;
} else {
pr_err("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;
pr_info("attempting to read past end of device\n");
pr_info("an error is expected...\n");
err = mtd_read_oob(mtd, mtd->size - mtd->writesize, &ops);
if (err) {
pr_info("error occurred as expected\n");
err = 0;
} else {
pr_err("error: read past end of device\n");
errcnt += 1;
}
}
/* Fifth test: write / read across block boundaries */
pr_info("test 5 of 5\n");
/* Erase all eraseblocks */
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
/* Write all eraseblocks */
prandom_seed_state(&rnd_state, 11);
pr_info("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;
prandom_bytes_state(&rnd_state, writebuf, sz * cnt);
for (pg = 0; pg < cnt; ++pg) {
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 + pg * sz;
err = mtd_write_oob(mtd, addr, &ops);
if (err)
goto out;
if (i % 256 == 0)
pr_info("written up to eraseblock %u\n", i);
cond_resched();
addr += mtd->writesize;
}
}
pr_info("written %u eraseblocks\n", i);
/* Check all eraseblocks */
prandom_seed_state(&rnd_state, 11);
pr_info("verifying all eraseblocks\n");
for (i = 0; i < ebcnt - 1; ++i) {
if (bbt[i] || bbt[i + 1])
continue;
prandom_bytes_state(&rnd_state, 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)) {
pr_err("error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
if (errcnt > 1000) {
pr_err("error: too many errors\n");
goto out;
}
}
if (i % 256 == 0)
pr_info("verified up to eraseblock %u\n", i);
cond_resched();
}
pr_info("verified %u eraseblocks\n", i);
pr_info("finished with %d errors\n", errcnt);
out:
kfree(bbt);
kfree(writebuf);
kfree(readbuf);
put_mtd_device(mtd);
if (err)
pr_info("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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