MTD: tests: add mtd_readtest
A simple tests which reads whole MTD device one page at a time. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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Artem Bityutskiy
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e73f217439
Коммит
72091b6889
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/*
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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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* Check MTD device read.
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*
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* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
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*/
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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/sched.h>
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#define PRINT_PREF KERN_INFO "mtd_readtest: "
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static int dev;
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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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static struct mtd_info *mtd;
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static unsigned char *iobuf;
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static unsigned char *iobuf1;
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static unsigned char *bbt;
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static int pgsize;
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static int ebcnt;
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static int pgcnt;
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static int read_eraseblock_by_page(int ebnum)
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{
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size_t read = 0;
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int i, ret, err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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void *buf = iobuf;
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void *oobbuf = iobuf1;
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for (i = 0; i < pgcnt; i++) {
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memset(buf, 0 , pgcnt);
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ret = mtd->read(mtd, addr, pgsize, &read, buf);
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if (ret == -EUCLEAN)
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ret = 0;
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if (ret || read != pgsize) {
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printk(PRINT_PREF "error: read failed at %#llx\n",
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(long long)addr);
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if (!err)
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err = ret;
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if (!err)
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err = -EINVAL;
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}
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if (mtd->oobsize) {
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struct mtd_oob_ops ops;
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ops.mode = MTD_OOB_PLACE;
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ops.len = 0;
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ops.retlen = 0;
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ops.ooblen = mtd->oobsize;
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ops.oobretlen = 0;
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ops.ooboffs = 0;
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ops.datbuf = 0;
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ops.oobbuf = oobbuf;
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ret = mtd->read_oob(mtd, addr, &ops);
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if (ret || ops.oobretlen != mtd->oobsize) {
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printk(PRINT_PREF "error: read oob failed at "
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"%#llx\n", (long long)addr);
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if (!err)
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err = ret;
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if (!err)
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err = -EINVAL;
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}
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oobbuf += mtd->oobsize;
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}
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addr += pgsize;
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buf += pgsize;
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}
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return err;
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}
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static void dump_eraseblock(int ebnum)
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{
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int i, j, n;
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char line[128];
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int pg, oob;
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printk(PRINT_PREF "dumping eraseblock %d\n", ebnum);
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n = mtd->erasesize;
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for (i = 0; i < n;) {
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char *p = line;
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p += sprintf(p, "%05x: ", i);
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for (j = 0; j < 32 && i < n; j++, i++)
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p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
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printk(KERN_CRIT "%s\n", line);
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cond_resched();
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}
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if (!mtd->oobsize)
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return;
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printk(PRINT_PREF "dumping oob from eraseblock %d\n", ebnum);
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n = mtd->oobsize;
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for (pg = 0, i = 0; pg < pgcnt; pg++)
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for (oob = 0; oob < n;) {
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char *p = line;
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p += sprintf(p, "%05x: ", i);
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for (j = 0; j < 32 && oob < n; j++, oob++, i++)
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p += sprintf(p, "%02x",
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(unsigned int)iobuf1[i]);
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printk(KERN_CRIT "%s\n", line);
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cond_resched();
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}
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}
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static int is_block_bad(int ebnum)
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{
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loff_t addr = ebnum * mtd->erasesize;
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int ret;
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ret = mtd->block_isbad(mtd, addr);
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if (ret)
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printk(PRINT_PREF "block %d is bad\n", ebnum);
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return ret;
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}
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static int scan_for_bad_eraseblocks(void)
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{
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int i, bad = 0;
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bbt = kmalloc(ebcnt, GFP_KERNEL);
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if (!bbt) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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return -ENOMEM;
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}
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memset(bbt, 0 , ebcnt);
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printk(PRINT_PREF "scanning for bad eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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bbt[i] = is_block_bad(i) ? 1 : 0;
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if (bbt[i])
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bad += 1;
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cond_resched();
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}
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printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
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return 0;
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}
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static int __init mtd_readtest_init(void)
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{
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uint64_t tmp;
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int err, i;
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printk(KERN_INFO "\n");
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printk(KERN_INFO "=================================================\n");
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printk(PRINT_PREF "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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printk(PRINT_PREF "error: Cannot get MTD device\n");
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return err;
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}
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if (mtd->writesize == 1) {
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printk(PRINT_PREF "not NAND flash, assume page size is 512 "
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"bytes.\n");
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pgsize = 512;
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} else
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pgsize = mtd->writesize;
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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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printk(PRINT_PREF "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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pgsize, ebcnt, pgcnt, mtd->oobsize);
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err = -ENOMEM;
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iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!iobuf) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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goto out;
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}
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iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!iobuf1) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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goto out;
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}
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err = scan_for_bad_eraseblocks();
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if (err)
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goto out;
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/* Read all eraseblocks 1 page at a time */
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printk(PRINT_PREF "testing page read\n");
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for (i = 0; i < ebcnt; ++i) {
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int ret;
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if (bbt[i])
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continue;
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ret = read_eraseblock_by_page(i);
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if (ret) {
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dump_eraseblock(i);
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if (!err)
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err = ret;
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}
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cond_resched();
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}
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if (err)
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printk(PRINT_PREF "finished with errors\n");
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else
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printk(PRINT_PREF "finished\n");
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out:
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kfree(iobuf);
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kfree(iobuf1);
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kfree(bbt);
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put_mtd_device(mtd);
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if (err)
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printk(PRINT_PREF "error %d occurred\n", err);
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printk(KERN_INFO "=================================================\n");
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return err;
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}
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module_init(mtd_readtest_init);
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static void __exit mtd_readtest_exit(void)
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{
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return;
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}
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module_exit(mtd_readtest_exit);
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MODULE_DESCRIPTION("Read test module");
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MODULE_AUTHOR("Adrian Hunter");
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MODULE_LICENSE("GPL");
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