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linux/drivers/mtd/tests/oobtest.c
Miquel Raynal 12663b442e mtd: mtd_oobtest: Handle bitflips during reads 
Reads from NAND devices usually trigger bitflips, this is an expected
behavior. While bitflips are under a given threshold, the MTD core
returns 0. However, when the number of corrected bitflips is above this
same threshold, -EUCLEAN is returned to inform the upper layer that this
block is slightly dying and soon the ECC engine will be overtaken so
actions should be taken to move the data out of it.

This particular condition should not be treated like an error and the
test should continue.

Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
2018-01-12 10:24:08 +01:00

751 lines
18 KiB
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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;
static int bitflip_limit;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");
module_param(bitflip_limit, int, S_IRUGO);
MODULE_PARM_DESC(bitflip_limit, "Max. allowed bitflips per page");
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 = (loff_t)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);
err = mtdtest_relax();
if (err)
return err;
}
pr_info("written %u eraseblocks\n", i);
return 0;
}
/*
* Display the address, offset and data bytes at comparison failure.
* Return number of bitflips encountered.
*/
static size_t memcmpshowoffset(loff_t addr, loff_t offset, const void *cs,
const void *ct, size_t count)
{
const unsigned char *su1, *su2;
int res;
size_t i = 0;
size_t bitflips = 0;
for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--, i++) {
res = *su1 ^ *su2;
if (res) {
pr_info("error @addr[0x%lx:0x%lx] 0x%x -> 0x%x diff 0x%x\n",
(unsigned long)addr, (unsigned long)offset + i,
*su1, *su2, res);
bitflips += hweight8(res);
}
}
return bitflips;
}
#define memcmpshow(addr, cs, ct, count) memcmpshowoffset((addr), 0, (cs), (ct),\
(count))
/*
* Compare with 0xff and show the address, offset and data bytes at
* comparison failure. Return number of bitflips encountered.
*/
static size_t memffshow(loff_t addr, loff_t offset, const void *cs,
size_t count)
{
const unsigned char *su1;
int res;
size_t i = 0;
size_t bitflips = 0;
for (su1 = cs; 0 < count; ++su1, count--, i++) {
res = *su1 ^ 0xff;
if (res) {
pr_info("error @addr[0x%lx:0x%lx] 0x%x -> 0xff diff 0x%x\n",
(unsigned long)addr, (unsigned long)offset + i,
*su1, res);
bitflips += hweight8(res);
}
}
return bitflips;
}
static int verify_eraseblock(int ebnum)
{
int i;
struct mtd_oob_ops ops;
int err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
size_t bitflips;
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 (mtd_is_bitflip(err))
err = 0;
if (err || ops.oobretlen != use_len) {
pr_err("error: readoob failed at %#llx\n",
(long long)addr);
errcnt += 1;
return err ? err : -1;
}
bitflips = memcmpshow(addr, readbuf,
writebuf + (use_len_max * i) + use_offset,
use_len);
if (bitflips > bitflip_limit) {
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;
}
} else if (bitflips) {
pr_info("ignoring error as within bitflip_limit\n");
}
if (use_offset != 0 || use_len < mtd->oobavail) {
int k;
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = mtd->oobavail;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
err = mtd_read_oob(mtd, addr, &ops);
if (mtd_is_bitflip(err))
err = 0;
if (err || ops.oobretlen != mtd->oobavail) {
pr_err("error: readoob failed at %#llx\n",
(long long)addr);
errcnt += 1;
return err ? err : -1;
}
bitflips = memcmpshowoffset(addr, use_offset,
readbuf + use_offset,
writebuf + (use_len_max * i) + use_offset,
use_len);
/* verify pre-offset area for 0xff */
bitflips += memffshow(addr, 0, readbuf, use_offset);
/* verify post-(use_offset + use_len) area for 0xff */
k = use_offset + use_len;
bitflips += memffshow(addr, k, readbuf + k,
mtd->oobavail - k);
if (bitflips > bitflip_limit) {
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;
}
} else if (bitflips) {
pr_info("ignoring errors as within bitflip limit\n");
}
}
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 = (loff_t)ebnum * mtd->erasesize;
size_t len = mtd->oobavail * pgcnt;
size_t oobavail = mtd->oobavail;
size_t bitflips;
int i;
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;
/* read entire block's OOB at one go */
err = mtd_read_oob(mtd, addr, &ops);
if (mtd_is_bitflip(err))
err = 0;
if (err || ops.oobretlen != len) {
pr_err("error: readoob failed at %#llx\n",
(long long)addr);
errcnt += 1;
return err ? err : -1;
}
/* verify one page OOB at a time for bitflip per page limit check */
for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
bitflips = memcmpshow(addr, readbuf + (i * oobavail),
writebuf + (i * oobavail), oobavail);
if (bitflips > bitflip_limit) {
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;
}
} else if (bitflips) {
pr_info("ignoring error as within bitflip_limit\n");
}
}
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);
err = mtdtest_relax();
if (err)
return err;
}
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->oobavail;
use_len_max = mtd->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);
err = mtdtest_relax();
if (err)
goto out;
}
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->oobavail;
use_len_max = mtd->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->oobavail;
use_len_max = mtd->oobavail;
vary_offset = 1;
prandom_seed_state(&rnd_state, 5);
err = verify_all_eraseblocks();
if (err)
goto out;
use_offset = 0;
use_len = mtd->oobavail;
use_len_max = mtd->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->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->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 (mtd_is_bitflip(err))
err = 0;
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->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->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 (mtd_is_bitflip(err))
err = 0;
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->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->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 (mtd_is_bitflip(err))
err = 0;
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->oobavail;
if (bbt[i] || bbt[i + 1])
continue;
addr = (loff_t)(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);
err = mtdtest_relax();
if (err)
goto out;
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->oobavail * 2);
addr = (loff_t)(i + 1) * mtd->erasesize - mtd->writesize;
ops.mode = MTD_OPS_AUTO_OOB;
ops.len = 0;
ops.retlen = 0;
ops.ooblen = mtd->oobavail * 2;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = NULL;
ops.oobbuf = readbuf;
err = mtd_read_oob(mtd, addr, &ops);
if (mtd_is_bitflip(err))
err = 0;
if (err)
goto out;
if (memcmpshow(addr, readbuf, writebuf,
mtd->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);
err = mtdtest_relax();
if (err)
goto out;
}
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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