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alistair23-linux/drivers/mtd/tests/pagetest.c
Richard Weinberger 2a6a28e792 mtd: Make MTD tests cancelable 
I always go nuts when I start an MTD test on a slow device and have to
wait forever until it finishes. From the debug output I already know
what the issue is but I have to wait or reset the board hard. Resetting
is often not an option (remote access, you don't want lose the current
state, etc...).

The solution is easy, check for pending signals at key positions in the
code. Using that one can even stop a test by pressing CTRL-C as
insmod/modprobe have SIGINT pending.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
2015-04-05 18:12:53 -07:00

471 lines
11 KiB
C
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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>
#include "mtd_test.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 write_eraseblock(int ebnum)
{
loff_t addr = (loff_t)ebnum * mtd->erasesize;
prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
cond_resched();
return mtdtest_write(mtd, addr, mtd->erasesize, writebuf);
}
static int verify_eraseblock(int ebnum)
{
uint32_t j;
int err = 0, i;
loff_t addr0, addrn;
loff_t addr = (loff_t)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 = mtdtest_read(mtd, addr0, bufsize, twopages);
if (err)
return err;
err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages);
if (err)
return err;
memset(twopages, 0, bufsize);
err = mtdtest_read(mtd, addr, bufsize, twopages);
if (err)
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 = mtdtest_read(mtd, addr0, bufsize, twopages);
if (err)
return err;
err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages);
if (err)
return err;
memset(twopages, 0, bufsize);
err = mtdtest_read(mtd, addr, bufsize, twopages);
if (err)
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)
{
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)
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 = mtdtest_read(mtd, addr, pgsize, pp1);
if (err) {
kfree(pp1);
return err;
}
/* Read 3rd-to-last page to pp1 */
addr = addrn - pgsize - pgsize - pgsize;
err = mtdtest_read(mtd, addr, pgsize, pp1);
if (err) {
kfree(pp1);
return err;
}
/* Read first page to pp2 */
addr = addr0;
pr_info("reading page at %#llx\n", (long long)addr);
err = mtdtest_read(mtd, addr, pgsize, pp2);
if (err) {
kfree(pp1);
return err;
}
/* Read last page to pp3 */
addr = addrn - pgsize;
pr_info("reading page at %#llx\n", (long long)addr);
err = mtdtest_read(mtd, addr, pgsize, pp3);
if (err) {
kfree(pp1);
return err;
}
/* Read first page again to pp4 */
addr = addr0;
pr_info("reading page at %#llx\n", (long long)addr);
err = mtdtest_read(mtd, addr, pgsize, pp4);
if (err) {
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)
{
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 = mtdtest_erase_eraseblock(mtd, 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 = mtdtest_write(mtd, addr0, pgsize, writebuf);
if (err)
return err;
pr_info("reading 1st page of block %d\n", ebnum);
memset(readbuf, 0, pgsize);
err = mtdtest_read(mtd, addr0, pgsize, readbuf);
if (err)
return err;
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 = mtdtest_erase_eraseblock(mtd, 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 = mtdtest_write(mtd, addr0, pgsize, writebuf);
if (err)
return err;
pr_info("erasing block %d\n", ebnum2);
err = mtdtest_erase_eraseblock(mtd, ebnum2);
if (err)
return err;
pr_info("reading 1st page of block %d\n", ebnum);
memset(readbuf, 0, pgsize);
err = mtdtest_read(mtd, addr0, pgsize, readbuf);
if (err)
return err;
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)
{
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 = mtdtest_erase_eraseblock(mtd, ebnum);
if (err)
return err;
pr_info("writing 1st page of block %d\n", ebnum);
prandom_bytes_state(&rnd_state, writebuf, pgsize);
err = mtdtest_write(mtd, addr0, pgsize, writebuf);
if (err)
return err;
pr_info("erasing block %d\n", ebnum);
err = mtdtest_erase_eraseblock(mtd, ebnum);
if (err)
return err;
pr_info("reading 1st page of block %d\n", ebnum);
err = mtdtest_read(mtd, addr0, pgsize, twopages);
if (err)
return err;
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 __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_is_nand(mtd)) {
pr_info("this test requires NAND flash\n");
goto out;
}
tmp = mtd->size;
do_div(tmp, mtd->erasesize);
ebcnt = tmp;
pgcnt = mtd->erasesize / mtd->writesize;
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)
goto out;
twopages = kmalloc(bufsize, GFP_KERNEL);
if (!twopages)
goto out;
boundary = kmalloc(bufsize, GFP_KERNEL);
if (!boundary)
goto out;
bbt = kzalloc(ebcnt, GFP_KERNEL);
if (!bbt)
goto out;
err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
/* Erase all eraseblocks */
pr_info("erasing whole device\n");
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
pr_info("erased %u eraseblocks\n", ebcnt);
/* 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);
err = mtdtest_relax();
if (err)
goto out;
}
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);
err = mtdtest_relax();
if (err)
goto out;
}
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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