751 lines
18 KiB
C
751 lines
18 KiB
C
/*
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* Copyright (C) 2006-2008 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; see the file COPYING. If not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Test OOB read and write on MTD device.
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*
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* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <asm/div64.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/err.h>
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#include <linux/mtd/mtd.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/random.h>
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#include "mtd_test.h"
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static int dev = -EINVAL;
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static int bitflip_limit;
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module_param(dev, int, S_IRUGO);
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MODULE_PARM_DESC(dev, "MTD device number to use");
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module_param(bitflip_limit, int, S_IRUGO);
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MODULE_PARM_DESC(bitflip_limit, "Max. allowed bitflips per page");
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static struct mtd_info *mtd;
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static unsigned char *readbuf;
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static unsigned char *writebuf;
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static unsigned char *bbt;
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static int ebcnt;
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static int pgcnt;
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static int errcnt;
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static int use_offset;
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static int use_len;
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static int use_len_max;
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static int vary_offset;
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static struct rnd_state rnd_state;
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static void do_vary_offset(void)
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{
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use_len -= 1;
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if (use_len < 1) {
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use_offset += 1;
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if (use_offset >= use_len_max)
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use_offset = 0;
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use_len = use_len_max - use_offset;
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}
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}
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static int write_eraseblock(int ebnum)
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{
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int i;
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struct mtd_oob_ops ops;
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int err = 0;
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loff_t addr = (loff_t)ebnum * mtd->erasesize;
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prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
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for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
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ops.mode = MTD_OPS_AUTO_OOB;
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ops.len = 0;
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ops.retlen = 0;
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ops.ooblen = use_len;
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ops.oobretlen = 0;
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ops.ooboffs = use_offset;
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ops.datbuf = NULL;
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ops.oobbuf = writebuf + (use_len_max * i) + use_offset;
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err = mtd_write_oob(mtd, addr, &ops);
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if (err || ops.oobretlen != use_len) {
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pr_err("error: writeoob failed at %#llx\n",
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(long long)addr);
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pr_err("error: use_len %d, use_offset %d\n",
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use_len, use_offset);
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errcnt += 1;
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return err ? err : -1;
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}
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if (vary_offset)
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do_vary_offset();
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}
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return err;
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}
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static int write_whole_device(void)
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{
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int err;
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unsigned int i;
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pr_info("writing OOBs of whole device\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = write_eraseblock(i);
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if (err)
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return err;
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if (i % 256 == 0)
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pr_info("written up to eraseblock %u\n", i);
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err = mtdtest_relax();
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if (err)
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return err;
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}
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pr_info("written %u eraseblocks\n", i);
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return 0;
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}
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/*
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* Display the address, offset and data bytes at comparison failure.
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* Return number of bitflips encountered.
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*/
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static size_t memcmpshowoffset(loff_t addr, loff_t offset, const void *cs,
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const void *ct, size_t count)
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{
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const unsigned char *su1, *su2;
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int res;
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size_t i = 0;
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size_t bitflips = 0;
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for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--, i++) {
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res = *su1 ^ *su2;
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if (res) {
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pr_info("error @addr[0x%lx:0x%lx] 0x%x -> 0x%x diff 0x%x\n",
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(unsigned long)addr, (unsigned long)offset + i,
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*su1, *su2, res);
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bitflips += hweight8(res);
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}
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}
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return bitflips;
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}
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#define memcmpshow(addr, cs, ct, count) memcmpshowoffset((addr), 0, (cs), (ct),\
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(count))
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/*
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* Compare with 0xff and show the address, offset and data bytes at
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* comparison failure. Return number of bitflips encountered.
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*/
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static size_t memffshow(loff_t addr, loff_t offset, const void *cs,
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size_t count)
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{
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const unsigned char *su1;
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int res;
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size_t i = 0;
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size_t bitflips = 0;
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for (su1 = cs; 0 < count; ++su1, count--, i++) {
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res = *su1 ^ 0xff;
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if (res) {
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pr_info("error @addr[0x%lx:0x%lx] 0x%x -> 0xff diff 0x%x\n",
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(unsigned long)addr, (unsigned long)offset + i,
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*su1, res);
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bitflips += hweight8(res);
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}
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}
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return bitflips;
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}
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static int verify_eraseblock(int ebnum)
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{
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int i;
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struct mtd_oob_ops ops;
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int err = 0;
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loff_t addr = (loff_t)ebnum * mtd->erasesize;
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size_t bitflips;
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prandom_bytes_state(&rnd_state, writebuf, use_len_max * pgcnt);
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for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
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ops.mode = MTD_OPS_AUTO_OOB;
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ops.len = 0;
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ops.retlen = 0;
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ops.ooblen = use_len;
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ops.oobretlen = 0;
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ops.ooboffs = use_offset;
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ops.datbuf = NULL;
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ops.oobbuf = readbuf;
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err = mtd_read_oob(mtd, addr, &ops);
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if (mtd_is_bitflip(err))
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err = 0;
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if (err || ops.oobretlen != use_len) {
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pr_err("error: readoob failed at %#llx\n",
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(long long)addr);
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errcnt += 1;
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return err ? err : -1;
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}
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bitflips = memcmpshow(addr, readbuf,
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writebuf + (use_len_max * i) + use_offset,
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use_len);
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if (bitflips > bitflip_limit) {
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pr_err("error: verify failed at %#llx\n",
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(long long)addr);
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errcnt += 1;
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if (errcnt > 1000) {
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pr_err("error: too many errors\n");
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return -1;
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}
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} else if (bitflips) {
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pr_info("ignoring error as within bitflip_limit\n");
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}
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if (use_offset != 0 || use_len < mtd->oobavail) {
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int k;
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ops.mode = MTD_OPS_AUTO_OOB;
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ops.len = 0;
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ops.retlen = 0;
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ops.ooblen = mtd->oobavail;
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ops.oobretlen = 0;
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ops.ooboffs = 0;
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ops.datbuf = NULL;
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ops.oobbuf = readbuf;
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err = mtd_read_oob(mtd, addr, &ops);
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if (mtd_is_bitflip(err))
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err = 0;
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if (err || ops.oobretlen != mtd->oobavail) {
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pr_err("error: readoob failed at %#llx\n",
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(long long)addr);
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errcnt += 1;
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return err ? err : -1;
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}
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bitflips = memcmpshowoffset(addr, use_offset,
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readbuf + use_offset,
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writebuf + (use_len_max * i) + use_offset,
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use_len);
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/* verify pre-offset area for 0xff */
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bitflips += memffshow(addr, 0, readbuf, use_offset);
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/* verify post-(use_offset + use_len) area for 0xff */
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k = use_offset + use_len;
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bitflips += memffshow(addr, k, readbuf + k,
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mtd->oobavail - k);
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if (bitflips > bitflip_limit) {
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pr_err("error: verify failed at %#llx\n",
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(long long)addr);
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errcnt += 1;
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if (errcnt > 1000) {
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pr_err("error: too many errors\n");
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return -1;
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}
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} else if (bitflips) {
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pr_info("ignoring errors as within bitflip limit\n");
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}
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}
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if (vary_offset)
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do_vary_offset();
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}
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return err;
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}
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static int verify_eraseblock_in_one_go(int ebnum)
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{
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struct mtd_oob_ops ops;
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int err = 0;
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loff_t addr = (loff_t)ebnum * mtd->erasesize;
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size_t len = mtd->oobavail * pgcnt;
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size_t oobavail = mtd->oobavail;
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size_t bitflips;
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int i;
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prandom_bytes_state(&rnd_state, writebuf, len);
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ops.mode = MTD_OPS_AUTO_OOB;
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ops.len = 0;
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ops.retlen = 0;
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ops.ooblen = len;
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ops.oobretlen = 0;
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ops.ooboffs = 0;
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ops.datbuf = NULL;
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ops.oobbuf = readbuf;
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/* read entire block's OOB at one go */
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err = mtd_read_oob(mtd, addr, &ops);
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if (mtd_is_bitflip(err))
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err = 0;
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if (err || ops.oobretlen != len) {
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pr_err("error: readoob failed at %#llx\n",
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(long long)addr);
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errcnt += 1;
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return err ? err : -1;
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}
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/* verify one page OOB at a time for bitflip per page limit check */
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for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
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bitflips = memcmpshow(addr, readbuf + (i * oobavail),
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writebuf + (i * oobavail), oobavail);
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if (bitflips > bitflip_limit) {
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pr_err("error: verify failed at %#llx\n",
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(long long)addr);
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errcnt += 1;
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if (errcnt > 1000) {
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pr_err("error: too many errors\n");
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return -1;
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}
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} else if (bitflips) {
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pr_info("ignoring error as within bitflip_limit\n");
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}
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}
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return err;
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}
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static int verify_all_eraseblocks(void)
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{
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int err;
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unsigned int i;
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pr_info("verifying all eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = verify_eraseblock(i);
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if (err)
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return err;
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if (i % 256 == 0)
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pr_info("verified up to eraseblock %u\n", i);
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err = mtdtest_relax();
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if (err)
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return err;
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}
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pr_info("verified %u eraseblocks\n", i);
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return 0;
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}
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static int __init mtd_oobtest_init(void)
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{
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int err = 0;
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unsigned int i;
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uint64_t tmp;
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struct mtd_oob_ops ops;
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loff_t addr = 0, addr0;
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printk(KERN_INFO "\n");
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printk(KERN_INFO "=================================================\n");
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if (dev < 0) {
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pr_info("Please specify a valid mtd-device via module parameter\n");
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pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
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return -EINVAL;
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}
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pr_info("MTD device: %d\n", dev);
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mtd = get_mtd_device(NULL, dev);
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if (IS_ERR(mtd)) {
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err = PTR_ERR(mtd);
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pr_err("error: cannot get MTD device\n");
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return err;
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}
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if (!mtd_type_is_nand(mtd)) {
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pr_info("this test requires NAND flash\n");
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goto out;
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}
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tmp = mtd->size;
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do_div(tmp, mtd->erasesize);
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ebcnt = tmp;
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pgcnt = mtd->erasesize / mtd->writesize;
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pr_info("MTD device size %llu, eraseblock size %u, "
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"page size %u, count of eraseblocks %u, pages per "
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"eraseblock %u, OOB size %u\n",
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(unsigned long long)mtd->size, mtd->erasesize,
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mtd->writesize, ebcnt, pgcnt, mtd->oobsize);
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err = -ENOMEM;
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readbuf = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!readbuf)
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goto out;
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writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!writebuf)
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goto out;
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bbt = kzalloc(ebcnt, GFP_KERNEL);
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if (!bbt)
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goto out;
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err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
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if (err)
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goto out;
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use_offset = 0;
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use_len = mtd->oobavail;
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use_len_max = mtd->oobavail;
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vary_offset = 0;
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/* First test: write all OOB, read it back and verify */
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pr_info("test 1 of 5\n");
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err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
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if (err)
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goto out;
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prandom_seed_state(&rnd_state, 1);
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err = write_whole_device();
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if (err)
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goto out;
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prandom_seed_state(&rnd_state, 1);
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err = verify_all_eraseblocks();
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if (err)
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goto out;
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/*
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* Second test: write all OOB, a block at a time, read it back and
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* verify.
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*/
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pr_info("test 2 of 5\n");
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err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
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if (err)
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goto out;
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prandom_seed_state(&rnd_state, 3);
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err = write_whole_device();
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if (err)
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goto out;
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/* Check all eraseblocks */
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prandom_seed_state(&rnd_state, 3);
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pr_info("verifying all eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = verify_eraseblock_in_one_go(i);
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if (err)
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goto out;
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if (i % 256 == 0)
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pr_info("verified up to eraseblock %u\n", i);
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err = mtdtest_relax();
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if (err)
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goto out;
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}
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pr_info("verified %u eraseblocks\n", i);
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/*
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* Third test: write OOB at varying offsets and lengths, read it back
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* and verify.
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*/
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pr_info("test 3 of 5\n");
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err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
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if (err)
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goto out;
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/* Write all eraseblocks */
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use_offset = 0;
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use_len = mtd->oobavail;
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use_len_max = mtd->oobavail;
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vary_offset = 1;
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prandom_seed_state(&rnd_state, 5);
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err = write_whole_device();
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if (err)
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goto out;
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/* Check all eraseblocks */
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use_offset = 0;
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use_len = mtd->oobavail;
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use_len_max = mtd->oobavail;
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vary_offset = 1;
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prandom_seed_state(&rnd_state, 5);
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err = verify_all_eraseblocks();
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if (err)
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goto out;
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use_offset = 0;
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use_len = mtd->oobavail;
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use_len_max = mtd->oobavail;
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vary_offset = 0;
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/* Fourth test: try to write off end of device */
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pr_info("test 4 of 5\n");
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err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
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if (err)
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goto out;
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addr0 = 0;
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for (i = 0; i < ebcnt && bbt[i]; ++i)
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addr0 += mtd->erasesize;
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/* Attempt to write off end of OOB */
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ops.mode = MTD_OPS_AUTO_OOB;
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ops.len = 0;
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ops.retlen = 0;
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ops.ooblen = 1;
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ops.oobretlen = 0;
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ops.ooboffs = mtd->oobavail;
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ops.datbuf = NULL;
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ops.oobbuf = writebuf;
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pr_info("attempting to start write past end of OOB\n");
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pr_info("an error is expected...\n");
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err = mtd_write_oob(mtd, addr0, &ops);
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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");
|