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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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7406060e29
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>
532 lines
13 KiB
C
532 lines
13 KiB
C
/*
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* Copyright (C) 2006-2007 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 sub-page read and write on MTD device.
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* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
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*
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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/slab.h>
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#include <linux/sched.h>
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#define PRINT_PREF KERN_INFO "mtd_subpagetest: "
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static int dev = -EINVAL;
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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 *writebuf;
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static unsigned char *readbuf;
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static unsigned char *bbt;
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static int subpgsize;
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static int bufsize;
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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 unsigned long next = 1;
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static inline unsigned int simple_rand(void)
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{
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next = next * 1103515245 + 12345;
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return (unsigned int)((next / 65536) % 32768);
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}
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static inline void simple_srand(unsigned long seed)
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{
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next = seed;
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}
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static void set_random_data(unsigned char *buf, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i)
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buf[i] = simple_rand();
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}
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static inline void clear_data(unsigned char *buf, size_t len)
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{
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memset(buf, 0, len);
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}
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static int erase_eraseblock(int ebnum)
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{
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int err;
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struct erase_info ei;
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loff_t addr = ebnum * mtd->erasesize;
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memset(&ei, 0, sizeof(struct erase_info));
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ei.mtd = mtd;
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ei.addr = addr;
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ei.len = mtd->erasesize;
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err = mtd->erase(mtd, &ei);
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if (err) {
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printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
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return err;
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}
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if (ei.state == MTD_ERASE_FAILED) {
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printk(PRINT_PREF "some erase error occurred at EB %d\n",
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ebnum);
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return -EIO;
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}
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return 0;
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}
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static int erase_whole_device(void)
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{
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int err;
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unsigned int i;
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printk(PRINT_PREF "erasing 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 = erase_eraseblock(i);
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if (err)
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return err;
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cond_resched();
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}
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printk(PRINT_PREF "erased %u eraseblocks\n", i);
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return 0;
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}
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static int write_eraseblock(int ebnum)
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{
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size_t written = 0;
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int err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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set_random_data(writebuf, subpgsize);
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err = mtd->write(mtd, addr, subpgsize, &written, writebuf);
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if (unlikely(err || written != subpgsize)) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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(long long)addr);
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if (written != subpgsize) {
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printk(PRINT_PREF " write size: %#x\n", subpgsize);
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printk(PRINT_PREF " written: %#zx\n", written);
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}
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return err ? err : -1;
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}
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addr += subpgsize;
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set_random_data(writebuf, subpgsize);
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err = mtd->write(mtd, addr, subpgsize, &written, writebuf);
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if (unlikely(err || written != subpgsize)) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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(long long)addr);
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if (written != subpgsize) {
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printk(PRINT_PREF " write size: %#x\n", subpgsize);
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printk(PRINT_PREF " written: %#zx\n", written);
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}
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return err ? err : -1;
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}
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return err;
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}
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static int write_eraseblock2(int ebnum)
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{
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size_t written = 0;
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int err = 0, k;
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loff_t addr = ebnum * mtd->erasesize;
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for (k = 1; k < 33; ++k) {
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if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
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break;
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set_random_data(writebuf, subpgsize * k);
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err = mtd->write(mtd, addr, subpgsize * k, &written, writebuf);
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if (unlikely(err || written != subpgsize * k)) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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(long long)addr);
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if (written != subpgsize) {
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printk(PRINT_PREF " write size: %#x\n",
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subpgsize * k);
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printk(PRINT_PREF " written: %#08zx\n",
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written);
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}
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return err ? err : -1;
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}
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addr += subpgsize * k;
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}
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return err;
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}
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static void print_subpage(unsigned char *p)
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{
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int i, j;
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for (i = 0; i < subpgsize; ) {
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for (j = 0; i < subpgsize && j < 32; ++i, ++j)
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printk("%02x", *p++);
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printk("\n");
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}
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}
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static int verify_eraseblock(int ebnum)
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{
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size_t read = 0;
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int err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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set_random_data(writebuf, subpgsize);
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clear_data(readbuf, subpgsize);
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read = 0;
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err = mtd->read(mtd, addr, subpgsize, &read, readbuf);
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if (unlikely(err || read != subpgsize)) {
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if (mtd_is_bitflip(err) && read == subpgsize) {
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printk(PRINT_PREF "ECC correction at %#llx\n",
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(long long)addr);
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err = 0;
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} else {
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printk(PRINT_PREF "error: read failed at %#llx\n",
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(long long)addr);
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return err ? err : -1;
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}
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}
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if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
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printk(PRINT_PREF "error: verify failed at %#llx\n",
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(long long)addr);
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printk(PRINT_PREF "------------- written----------------\n");
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print_subpage(writebuf);
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printk(PRINT_PREF "------------- read ------------------\n");
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print_subpage(readbuf);
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printk(PRINT_PREF "-------------------------------------\n");
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errcnt += 1;
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}
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addr += subpgsize;
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set_random_data(writebuf, subpgsize);
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clear_data(readbuf, subpgsize);
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read = 0;
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err = mtd->read(mtd, addr, subpgsize, &read, readbuf);
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if (unlikely(err || read != subpgsize)) {
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if (mtd_is_bitflip(err) && read == subpgsize) {
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printk(PRINT_PREF "ECC correction at %#llx\n",
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(long long)addr);
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err = 0;
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} else {
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printk(PRINT_PREF "error: read failed at %#llx\n",
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(long long)addr);
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return err ? err : -1;
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}
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}
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if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
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printk(PRINT_PREF "error: verify failed at %#llx\n",
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(long long)addr);
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printk(PRINT_PREF "------------- written----------------\n");
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print_subpage(writebuf);
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printk(PRINT_PREF "------------- read ------------------\n");
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print_subpage(readbuf);
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printk(PRINT_PREF "-------------------------------------\n");
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errcnt += 1;
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}
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return err;
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}
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static int verify_eraseblock2(int ebnum)
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{
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size_t read = 0;
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int err = 0, k;
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loff_t addr = ebnum * mtd->erasesize;
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for (k = 1; k < 33; ++k) {
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if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
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break;
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set_random_data(writebuf, subpgsize * k);
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clear_data(readbuf, subpgsize * k);
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read = 0;
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err = mtd->read(mtd, addr, subpgsize * k, &read, readbuf);
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if (unlikely(err || read != subpgsize * k)) {
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if (mtd_is_bitflip(err) && read == subpgsize * k) {
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printk(PRINT_PREF "ECC correction at %#llx\n",
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(long long)addr);
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err = 0;
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} else {
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printk(PRINT_PREF "error: read failed at "
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"%#llx\n", (long long)addr);
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return err ? err : -1;
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}
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}
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if (unlikely(memcmp(readbuf, writebuf, subpgsize * k))) {
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printk(PRINT_PREF "error: verify failed at %#llx\n",
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(long long)addr);
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errcnt += 1;
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}
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addr += subpgsize * k;
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}
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return err;
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}
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static int verify_eraseblock_ff(int ebnum)
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{
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uint32_t j;
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size_t read = 0;
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int err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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memset(writebuf, 0xff, subpgsize);
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for (j = 0; j < mtd->erasesize / subpgsize; ++j) {
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clear_data(readbuf, subpgsize);
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read = 0;
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err = mtd->read(mtd, addr, subpgsize, &read, readbuf);
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if (unlikely(err || read != subpgsize)) {
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if (mtd_is_bitflip(err) && read == subpgsize) {
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printk(PRINT_PREF "ECC correction at %#llx\n",
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(long long)addr);
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err = 0;
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} else {
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printk(PRINT_PREF "error: read failed at "
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"%#llx\n", (long long)addr);
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return err ? err : -1;
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}
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}
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if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
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printk(PRINT_PREF "error: verify 0xff failed at "
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"%#llx\n", (long long)addr);
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errcnt += 1;
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}
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addr += subpgsize;
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}
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return err;
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}
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static int verify_all_eraseblocks_ff(void)
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{
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int err;
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unsigned int i;
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printk(PRINT_PREF "verifying all eraseblocks for 0xff\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_ff(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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printk(PRINT_PREF "verified up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "verified %u eraseblocks\n", i);
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return 0;
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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 = kzalloc(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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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_subpagetest_init(void)
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{
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int err = 0;
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uint32_t i;
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uint64_t tmp;
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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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printk(PRINT_PREF "Please specify a valid mtd-device via module paramter\n");
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printk(KERN_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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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->type != MTD_NANDFLASH) {
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printk(PRINT_PREF "this test requires NAND flash\n");
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goto out;
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}
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subpgsize = mtd->writesize >> mtd->subpage_sft;
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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, subpage size %u, count of eraseblocks %u, "
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"pages per eraseblock %u, OOB size %u\n",
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(unsigned long long)mtd->size, mtd->erasesize,
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mtd->writesize, subpgsize, ebcnt, pgcnt, mtd->oobsize);
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err = -ENOMEM;
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bufsize = subpgsize * 32;
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writebuf = kmalloc(bufsize, GFP_KERNEL);
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if (!writebuf) {
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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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readbuf = kmalloc(bufsize, GFP_KERNEL);
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if (!readbuf) {
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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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err = erase_whole_device();
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if (err)
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goto out;
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printk(PRINT_PREF "writing whole device\n");
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simple_srand(1);
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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 (unlikely(err))
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goto out;
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if (i % 256 == 0)
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printk(PRINT_PREF "written up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "written %u eraseblocks\n", i);
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simple_srand(1);
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printk(PRINT_PREF "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 (unlikely(err))
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goto out;
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if (i % 256 == 0)
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printk(PRINT_PREF "verified up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "verified %u eraseblocks\n", i);
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err = erase_whole_device();
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if (err)
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goto out;
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err = verify_all_eraseblocks_ff();
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if (err)
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goto out;
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/* Write all eraseblocks */
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simple_srand(3);
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printk(PRINT_PREF "writing 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_eraseblock2(i);
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if (unlikely(err))
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goto out;
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if (i % 256 == 0)
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printk(PRINT_PREF "written up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "written %u eraseblocks\n", i);
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/* Check all eraseblocks */
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simple_srand(3);
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printk(PRINT_PREF "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_eraseblock2(i);
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if (unlikely(err))
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goto out;
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if (i % 256 == 0)
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printk(PRINT_PREF "verified up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "verified %u eraseblocks\n", i);
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err = erase_whole_device();
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if (err)
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goto out;
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err = verify_all_eraseblocks_ff();
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if (err)
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goto out;
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printk(PRINT_PREF "finished with %d errors\n", errcnt);
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out:
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|
kfree(bbt);
|
|
kfree(readbuf);
|
|
kfree(writebuf);
|
|
put_mtd_device(mtd);
|
|
if (err)
|
|
printk(PRINT_PREF "error %d occurred\n", err);
|
|
printk(KERN_INFO "=================================================\n");
|
|
return err;
|
|
}
|
|
module_init(mtd_subpagetest_init);
|
|
|
|
static void __exit mtd_subpagetest_exit(void)
|
|
{
|
|
return;
|
|
}
|
|
module_exit(mtd_subpagetest_exit);
|
|
|
|
MODULE_DESCRIPTION("Subpage test module");
|
|
MODULE_AUTHOR("Adrian Hunter");
|
|
MODULE_LICENSE("GPL");
|