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linux-pinenote/drivers/mtd/tests/mtd_pagetest.c
Akinobu Mita 825b8ccb74 mtd: mtd_pagetest: convert to use prandom library 
This removes home-brewed pseudo-random number generator and use
prandom library.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Artem Bityutskiy <dedekind1@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Laight <david.laight@aculab.com>
Cc: Eilon Greenstein <eilong@broadcom.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Robert Love <robert.w.love@intel.com>
Cc: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-27 19:10:22 -08:00

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/*
* Copyright (C) 2006-2008 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Test page read and write on MTD device.
*
* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <asm/div64.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/random.h>
static int dev = -EINVAL;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");
static struct mtd_info *mtd;
static unsigned char *twopages;
static unsigned char *writebuf;
static unsigned char *boundary;
static unsigned char *bbt;
static int pgsize;
static int bufsize;
static int ebcnt;
static int pgcnt;
static int errcnt;
static struct rnd_state rnd_state;
static int erase_eraseblock(int ebnum)
{
int err;
struct erase_info ei;
loff_t addr = ebnum * mtd->erasesize;
memset(&ei, 0, sizeof(struct erase_info));
ei.mtd = mtd;
ei.addr = addr;
ei.len = mtd->erasesize;
err = mtd_erase(mtd, &ei);
if (err) {
pr_err("error %d while erasing EB %d\n", err, ebnum);
return err;
}
if (ei.state == MTD_ERASE_FAILED) {
pr_err("some erase error occurred at EB %d\n",
ebnum);
return -EIO;
}
return 0;
}
static int write_eraseblock(int ebnum)
{
int err = 0;
size_t written;
loff_t addr = ebnum * mtd->erasesize;
prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
cond_resched();
err = mtd_write(mtd, addr, mtd->erasesize, &written, writebuf);
if (err || written != mtd->erasesize)
pr_err("error: write failed at %#llx\n",
(long long)addr);
return err;
}
static int verify_eraseblock(int ebnum)
{
uint32_t j;
size_t read;
int err = 0, i;
loff_t addr0, addrn;
loff_t addr = ebnum * mtd->erasesize;
addr0 = 0;
for (i = 0; i < ebcnt && bbt[i]; ++i)
addr0 += mtd->erasesize;
addrn = mtd->size;
for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
addrn -= mtd->erasesize;
prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {
/* Do a read to set the internal dataRAMs to different data */
err = mtd_read(mtd, addr0, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != bufsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr0);
return err;
}
err = mtd_read(mtd, addrn - bufsize, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != bufsize) {
pr_err("error: read failed at %#llx\n",
(long long)(addrn - bufsize));
return err;
}
memset(twopages, 0, bufsize);
err = mtd_read(mtd, addr, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != bufsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr);
break;
}
if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) {
pr_err("error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
}
}
/* Check boundary between eraseblocks */
if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) {
struct rnd_state old_state = rnd_state;
/* Do a read to set the internal dataRAMs to different data */
err = mtd_read(mtd, addr0, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != bufsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr0);
return err;
}
err = mtd_read(mtd, addrn - bufsize, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != bufsize) {
pr_err("error: read failed at %#llx\n",
(long long)(addrn - bufsize));
return err;
}
memset(twopages, 0, bufsize);
err = mtd_read(mtd, addr, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != bufsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr);
return err;
}
memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);
prandom_bytes_state(&rnd_state, boundary + pgsize, pgsize);
if (memcmp(twopages, boundary, bufsize)) {
pr_err("error: verify failed at %#llx\n",
(long long)addr);
errcnt += 1;
}
rnd_state = old_state;
}
return err;
}
static int crosstest(void)
{
size_t read;
int err = 0, i;
loff_t addr, addr0, addrn;
unsigned char *pp1, *pp2, *pp3, *pp4;
pr_info("crosstest\n");
pp1 = kmalloc(pgsize * 4, GFP_KERNEL);
if (!pp1) {
pr_err("error: cannot allocate memory\n");
return -ENOMEM;
}
pp2 = pp1 + pgsize;
pp3 = pp2 + pgsize;
pp4 = pp3 + pgsize;
memset(pp1, 0, pgsize * 4);
addr0 = 0;
for (i = 0; i < ebcnt && bbt[i]; ++i)
addr0 += mtd->erasesize;
addrn = mtd->size;
for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
addrn -= mtd->erasesize;
/* Read 2nd-to-last page to pp1 */
addr = addrn - pgsize - pgsize;
err = mtd_read(mtd, addr, pgsize, &read, pp1);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr);
kfree(pp1);
return err;
}
/* Read 3rd-to-last page to pp1 */
addr = addrn - pgsize - pgsize - pgsize;
err = mtd_read(mtd, addr, pgsize, &read, pp1);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr);
kfree(pp1);
return err;
}
/* Read first page to pp2 */
addr = addr0;
pr_info("reading page at %#llx\n", (long long)addr);
err = mtd_read(mtd, addr, pgsize, &read, pp2);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr);
kfree(pp1);
return err;
}
/* Read last page to pp3 */
addr = addrn - pgsize;
pr_info("reading page at %#llx\n", (long long)addr);
err = mtd_read(mtd, addr, pgsize, &read, pp3);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr);
kfree(pp1);
return err;
}
/* Read first page again to pp4 */
addr = addr0;
pr_info("reading page at %#llx\n", (long long)addr);
err = mtd_read(mtd, addr, pgsize, &read, pp4);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr);
kfree(pp1);
return err;
}
/* pp2 and pp4 should be the same */
pr_info("verifying pages read at %#llx match\n",
(long long)addr0);
if (memcmp(pp2, pp4, pgsize)) {
pr_err("verify failed!\n");
errcnt += 1;
} else if (!err)
pr_info("crosstest ok\n");
kfree(pp1);
return err;
}
static int erasecrosstest(void)
{
size_t read, written;
int err = 0, i, ebnum, ebnum2;
loff_t addr0;
char *readbuf = twopages;
pr_info("erasecrosstest\n");
ebnum = 0;
addr0 = 0;
for (i = 0; i < ebcnt && bbt[i]; ++i) {
addr0 += mtd->erasesize;
ebnum += 1;
}
ebnum2 = ebcnt - 1;
while (ebnum2 && bbt[ebnum2])
ebnum2 -= 1;
pr_info("erasing block %d\n", ebnum);
err = erase_eraseblock(ebnum);
if (err)
return err;
pr_info("writing 1st page of block %d\n", ebnum);
prandom_bytes_state(&rnd_state, writebuf, pgsize);
strcpy(writebuf, "There is no data like this!");
err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
if (err || written != pgsize) {
pr_info("error: write failed at %#llx\n",
(long long)addr0);
return err ? err : -1;
}
pr_info("reading 1st page of block %d\n", ebnum);
memset(readbuf, 0, pgsize);
err = mtd_read(mtd, addr0, pgsize, &read, readbuf);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr0);
return err ? err : -1;
}
pr_info("verifying 1st page of block %d\n", ebnum);
if (memcmp(writebuf, readbuf, pgsize)) {
pr_err("verify failed!\n");
errcnt += 1;
return -1;
}
pr_info("erasing block %d\n", ebnum);
err = erase_eraseblock(ebnum);
if (err)
return err;
pr_info("writing 1st page of block %d\n", ebnum);
prandom_bytes_state(&rnd_state, writebuf, pgsize);
strcpy(writebuf, "There is no data like this!");
err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
if (err || written != pgsize) {
pr_err("error: write failed at %#llx\n",
(long long)addr0);
return err ? err : -1;
}
pr_info("erasing block %d\n", ebnum2);
err = erase_eraseblock(ebnum2);
if (err)
return err;
pr_info("reading 1st page of block %d\n", ebnum);
memset(readbuf, 0, pgsize);
err = mtd_read(mtd, addr0, pgsize, &read, readbuf);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr0);
return err ? err : -1;
}
pr_info("verifying 1st page of block %d\n", ebnum);
if (memcmp(writebuf, readbuf, pgsize)) {
pr_err("verify failed!\n");
errcnt += 1;
return -1;
}
if (!err)
pr_info("erasecrosstest ok\n");
return err;
}
static int erasetest(void)
{
size_t read, written;
int err = 0, i, ebnum, ok = 1;
loff_t addr0;
pr_info("erasetest\n");
ebnum = 0;
addr0 = 0;
for (i = 0; i < ebcnt && bbt[i]; ++i) {
addr0 += mtd->erasesize;
ebnum += 1;
}
pr_info("erasing block %d\n", ebnum);
err = erase_eraseblock(ebnum);
if (err)
return err;
pr_info("writing 1st page of block %d\n", ebnum);
prandom_bytes_state(&rnd_state, writebuf, pgsize);
err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
if (err || written != pgsize) {
pr_err("error: write failed at %#llx\n",
(long long)addr0);
return err ? err : -1;
}
pr_info("erasing block %d\n", ebnum);
err = erase_eraseblock(ebnum);
if (err)
return err;
pr_info("reading 1st page of block %d\n", ebnum);
err = mtd_read(mtd, addr0, pgsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
(long long)addr0);
return err ? err : -1;
}
pr_info("verifying 1st page of block %d is all 0xff\n",
ebnum);
for (i = 0; i < pgsize; ++i)
if (twopages[i] != 0xff) {
pr_err("verifying all 0xff failed at %d\n",
i);
errcnt += 1;
ok = 0;
break;
}
if (ok && !err)
pr_info("erasetest ok\n");
return err;
}
static int is_block_bad(int ebnum)
{
loff_t addr = ebnum * mtd->erasesize;
int ret;
ret = mtd_block_isbad(mtd, addr);
if (ret)
pr_info("block %d is bad\n", ebnum);
return ret;
}
static int scan_for_bad_eraseblocks(void)
{
int i, bad = 0;
bbt = kzalloc(ebcnt, GFP_KERNEL);
if (!bbt) {
pr_err("error: cannot allocate memory\n");
return -ENOMEM;
}
pr_info("scanning for bad eraseblocks\n");
for (i = 0; i < ebcnt; ++i) {
bbt[i] = is_block_bad(i) ? 1 : 0;
if (bbt[i])
bad += 1;
cond_resched();
}
pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
return 0;
}
static int __init mtd_pagetest_init(void)
{
int err = 0;
uint64_t tmp;
uint32_t i;
printk(KERN_INFO "\n");
printk(KERN_INFO "=================================================\n");
if (dev < 0) {
pr_info("Please specify a valid mtd-device via module parameter\n");
pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
return -EINVAL;
}
pr_info("MTD device: %d\n", dev);
mtd = get_mtd_device(NULL, dev);
if (IS_ERR(mtd)) {
err = PTR_ERR(mtd);
pr_err("error: cannot get MTD device\n");
return err;
}
if (mtd->type != MTD_NANDFLASH) {
pr_info("this test requires NAND flash\n");
goto out;
}
tmp = mtd->size;
do_div(tmp, mtd->erasesize);
ebcnt = tmp;
pgcnt = mtd->erasesize / mtd->writesize;
pgsize = mtd->writesize;
pr_info("MTD device size %llu, eraseblock size %u, "
"page size %u, count of eraseblocks %u, pages per "
"eraseblock %u, OOB size %u\n",
(unsigned long long)mtd->size, mtd->erasesize,
pgsize, ebcnt, pgcnt, mtd->oobsize);
err = -ENOMEM;
bufsize = pgsize * 2;
writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
if (!writebuf) {
pr_err("error: cannot allocate memory\n");
goto out;
}
twopages = kmalloc(bufsize, GFP_KERNEL);
if (!twopages) {
pr_err("error: cannot allocate memory\n");
goto out;
}
boundary = kmalloc(bufsize, GFP_KERNEL);
if (!boundary) {
pr_err("error: cannot allocate memory\n");
goto out;
}
err = scan_for_bad_eraseblocks();
if (err)
goto out;
/* Erase all eraseblocks */
pr_info("erasing whole device\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = erase_eraseblock(i);
if (err)
goto out;
cond_resched();
}
pr_info("erased %u eraseblocks\n", i);
/* Write all eraseblocks */
prandom_seed_state(&rnd_state, 1);
pr_info("writing whole device\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = write_eraseblock(i);
if (err)
goto out;
if (i % 256 == 0)
pr_info("written up to eraseblock %u\n", i);
cond_resched();
}
pr_info("written %u eraseblocks\n", i);
/* Check all eraseblocks */
prandom_seed_state(&rnd_state, 1);
pr_info("verifying all eraseblocks\n");
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = verify_eraseblock(i);
if (err)
goto out;
if (i % 256 == 0)
pr_info("verified up to eraseblock %u\n", i);
cond_resched();
}
pr_info("verified %u eraseblocks\n", i);
err = crosstest();
if (err)
goto out;
err = erasecrosstest();
if (err)
goto out;
err = erasetest();
if (err)
goto out;
pr_info("finished with %d errors\n", errcnt);
out:
kfree(bbt);
kfree(boundary);
kfree(twopages);
kfree(writebuf);
put_mtd_device(mtd);
if (err)
pr_info("error %d occurred\n", err);
printk(KERN_INFO "=================================================\n");
return err;
}
module_init(mtd_pagetest_init);
static void __exit mtd_pagetest_exit(void)
{
return;
}
module_exit(mtd_pagetest_exit);
MODULE_DESCRIPTION("NAND page test");
MODULE_AUTHOR("Adrian Hunter");
MODULE_LICENSE("GPL");
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