![Artem Bityutskiy](/assets/img/avatar_default.png)
MTD functions always assign the 'retlen' argument to 0 at the very beginning - the callers do not have to do this. I used the following semantic patch to find these places: @@ identifier retlen; expression a, b, c, d, e; constant C; type T; @@ ( - retlen = C; | T -retlen = C + retlen ; ) ... when != retlen when exists ( mtd_read(a, b, c, &retlen, d) | mtd_write(a, b, c, &retlen, d) | mtd_panic_write(a, b, c, &retlen, d) | mtd_point(a, b, c, &retlen, d, e) | mtd_read_fact_prot_reg(a, b, c, &retlen, d) | mtd_write_user_prot_reg(a, b, c, &retlen, d) | mtd_read_user_prot_reg(a, b, c, &retlen, d) | mtd_writev(a, b, c, d, &retlen) ) I ran it twice, because there were cases of double zero assigments in mtd tests. Then I went through the patch to verify that spatch did not find any false positives. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
529 lines
12 KiB
C
529 lines
12 KiB
C
/*
|
|
* Copyright (C) 2006-2007 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 sub-page read and write on MTD device.
|
|
* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
|
|
*
|
|
*/
|
|
|
|
#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>
|
|
|
|
#define PRINT_PREF KERN_INFO "mtd_subpagetest: "
|
|
|
|
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 *writebuf;
|
|
static unsigned char *readbuf;
|
|
static unsigned char *bbt;
|
|
|
|
static int subpgsize;
|
|
static int bufsize;
|
|
static int ebcnt;
|
|
static int pgcnt;
|
|
static int errcnt;
|
|
static unsigned long next = 1;
|
|
|
|
static inline unsigned int simple_rand(void)
|
|
{
|
|
next = next * 1103515245 + 12345;
|
|
return (unsigned int)((next / 65536) % 32768);
|
|
}
|
|
|
|
static inline void simple_srand(unsigned long seed)
|
|
{
|
|
next = seed;
|
|
}
|
|
|
|
static void set_random_data(unsigned char *buf, size_t len)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < len; ++i)
|
|
buf[i] = simple_rand();
|
|
}
|
|
|
|
static inline void clear_data(unsigned char *buf, size_t len)
|
|
{
|
|
memset(buf, 0, len);
|
|
}
|
|
|
|
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) {
|
|
printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
|
|
return err;
|
|
}
|
|
|
|
if (ei.state == MTD_ERASE_FAILED) {
|
|
printk(PRINT_PREF "some erase error occurred at EB %d\n",
|
|
ebnum);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int erase_whole_device(void)
|
|
{
|
|
int err;
|
|
unsigned int i;
|
|
|
|
printk(PRINT_PREF "erasing whole device\n");
|
|
for (i = 0; i < ebcnt; ++i) {
|
|
if (bbt[i])
|
|
continue;
|
|
err = erase_eraseblock(i);
|
|
if (err)
|
|
return err;
|
|
cond_resched();
|
|
}
|
|
printk(PRINT_PREF "erased %u eraseblocks\n", i);
|
|
return 0;
|
|
}
|
|
|
|
static int write_eraseblock(int ebnum)
|
|
{
|
|
size_t written;
|
|
int err = 0;
|
|
loff_t addr = ebnum * mtd->erasesize;
|
|
|
|
set_random_data(writebuf, subpgsize);
|
|
err = mtd_write(mtd, addr, subpgsize, &written, writebuf);
|
|
if (unlikely(err || written != subpgsize)) {
|
|
printk(PRINT_PREF "error: write failed at %#llx\n",
|
|
(long long)addr);
|
|
if (written != subpgsize) {
|
|
printk(PRINT_PREF " write size: %#x\n", subpgsize);
|
|
printk(PRINT_PREF " written: %#zx\n", written);
|
|
}
|
|
return err ? err : -1;
|
|
}
|
|
|
|
addr += subpgsize;
|
|
|
|
set_random_data(writebuf, subpgsize);
|
|
err = mtd_write(mtd, addr, subpgsize, &written, writebuf);
|
|
if (unlikely(err || written != subpgsize)) {
|
|
printk(PRINT_PREF "error: write failed at %#llx\n",
|
|
(long long)addr);
|
|
if (written != subpgsize) {
|
|
printk(PRINT_PREF " write size: %#x\n", subpgsize);
|
|
printk(PRINT_PREF " written: %#zx\n", written);
|
|
}
|
|
return err ? err : -1;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int write_eraseblock2(int ebnum)
|
|
{
|
|
size_t written;
|
|
int err = 0, k;
|
|
loff_t addr = ebnum * mtd->erasesize;
|
|
|
|
for (k = 1; k < 33; ++k) {
|
|
if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
|
|
break;
|
|
set_random_data(writebuf, subpgsize * k);
|
|
err = mtd_write(mtd, addr, subpgsize * k, &written, writebuf);
|
|
if (unlikely(err || written != subpgsize * k)) {
|
|
printk(PRINT_PREF "error: write failed at %#llx\n",
|
|
(long long)addr);
|
|
if (written != subpgsize) {
|
|
printk(PRINT_PREF " write size: %#x\n",
|
|
subpgsize * k);
|
|
printk(PRINT_PREF " written: %#08zx\n",
|
|
written);
|
|
}
|
|
return err ? err : -1;
|
|
}
|
|
addr += subpgsize * k;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void print_subpage(unsigned char *p)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < subpgsize; ) {
|
|
for (j = 0; i < subpgsize && j < 32; ++i, ++j)
|
|
printk("%02x", *p++);
|
|
printk("\n");
|
|
}
|
|
}
|
|
|
|
static int verify_eraseblock(int ebnum)
|
|
{
|
|
size_t read;
|
|
int err = 0;
|
|
loff_t addr = ebnum * mtd->erasesize;
|
|
|
|
set_random_data(writebuf, subpgsize);
|
|
clear_data(readbuf, subpgsize);
|
|
err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
|
|
if (unlikely(err || read != subpgsize)) {
|
|
if (mtd_is_bitflip(err) && read == subpgsize) {
|
|
printk(PRINT_PREF "ECC correction at %#llx\n",
|
|
(long long)addr);
|
|
err = 0;
|
|
} else {
|
|
printk(PRINT_PREF "error: read failed at %#llx\n",
|
|
(long long)addr);
|
|
return err ? err : -1;
|
|
}
|
|
}
|
|
if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
|
|
printk(PRINT_PREF "error: verify failed at %#llx\n",
|
|
(long long)addr);
|
|
printk(PRINT_PREF "------------- written----------------\n");
|
|
print_subpage(writebuf);
|
|
printk(PRINT_PREF "------------- read ------------------\n");
|
|
print_subpage(readbuf);
|
|
printk(PRINT_PREF "-------------------------------------\n");
|
|
errcnt += 1;
|
|
}
|
|
|
|
addr += subpgsize;
|
|
|
|
set_random_data(writebuf, subpgsize);
|
|
clear_data(readbuf, subpgsize);
|
|
err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
|
|
if (unlikely(err || read != subpgsize)) {
|
|
if (mtd_is_bitflip(err) && read == subpgsize) {
|
|
printk(PRINT_PREF "ECC correction at %#llx\n",
|
|
(long long)addr);
|
|
err = 0;
|
|
} else {
|
|
printk(PRINT_PREF "error: read failed at %#llx\n",
|
|
(long long)addr);
|
|
return err ? err : -1;
|
|
}
|
|
}
|
|
if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
|
|
printk(PRINT_PREF "error: verify failed at %#llx\n",
|
|
(long long)addr);
|
|
printk(PRINT_PREF "------------- written----------------\n");
|
|
print_subpage(writebuf);
|
|
printk(PRINT_PREF "------------- read ------------------\n");
|
|
print_subpage(readbuf);
|
|
printk(PRINT_PREF "-------------------------------------\n");
|
|
errcnt += 1;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int verify_eraseblock2(int ebnum)
|
|
{
|
|
size_t read;
|
|
int err = 0, k;
|
|
loff_t addr = ebnum * mtd->erasesize;
|
|
|
|
for (k = 1; k < 33; ++k) {
|
|
if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
|
|
break;
|
|
set_random_data(writebuf, subpgsize * k);
|
|
clear_data(readbuf, subpgsize * k);
|
|
err = mtd_read(mtd, addr, subpgsize * k, &read, readbuf);
|
|
if (unlikely(err || read != subpgsize * k)) {
|
|
if (mtd_is_bitflip(err) && read == subpgsize * k) {
|
|
printk(PRINT_PREF "ECC correction at %#llx\n",
|
|
(long long)addr);
|
|
err = 0;
|
|
} else {
|
|
printk(PRINT_PREF "error: read failed at "
|
|
"%#llx\n", (long long)addr);
|
|
return err ? err : -1;
|
|
}
|
|
}
|
|
if (unlikely(memcmp(readbuf, writebuf, subpgsize * k))) {
|
|
printk(PRINT_PREF "error: verify failed at %#llx\n",
|
|
(long long)addr);
|
|
errcnt += 1;
|
|
}
|
|
addr += subpgsize * k;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int verify_eraseblock_ff(int ebnum)
|
|
{
|
|
uint32_t j;
|
|
size_t read;
|
|
int err = 0;
|
|
loff_t addr = ebnum * mtd->erasesize;
|
|
|
|
memset(writebuf, 0xff, subpgsize);
|
|
for (j = 0; j < mtd->erasesize / subpgsize; ++j) {
|
|
clear_data(readbuf, subpgsize);
|
|
err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
|
|
if (unlikely(err || read != subpgsize)) {
|
|
if (mtd_is_bitflip(err) && read == subpgsize) {
|
|
printk(PRINT_PREF "ECC correction at %#llx\n",
|
|
(long long)addr);
|
|
err = 0;
|
|
} else {
|
|
printk(PRINT_PREF "error: read failed at "
|
|
"%#llx\n", (long long)addr);
|
|
return err ? err : -1;
|
|
}
|
|
}
|
|
if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
|
|
printk(PRINT_PREF "error: verify 0xff failed at "
|
|
"%#llx\n", (long long)addr);
|
|
errcnt += 1;
|
|
}
|
|
addr += subpgsize;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int verify_all_eraseblocks_ff(void)
|
|
{
|
|
int err;
|
|
unsigned int i;
|
|
|
|
printk(PRINT_PREF "verifying all eraseblocks for 0xff\n");
|
|
for (i = 0; i < ebcnt; ++i) {
|
|
if (bbt[i])
|
|
continue;
|
|
err = verify_eraseblock_ff(i);
|
|
if (err)
|
|
return err;
|
|
if (i % 256 == 0)
|
|
printk(PRINT_PREF "verified up to eraseblock %u\n", i);
|
|
cond_resched();
|
|
}
|
|
printk(PRINT_PREF "verified %u eraseblocks\n", i);
|
|
return 0;
|
|
}
|
|
|
|
static int is_block_bad(int ebnum)
|
|
{
|
|
loff_t addr = ebnum * mtd->erasesize;
|
|
int ret;
|
|
|
|
ret = mtd_block_isbad(mtd, addr);
|
|
if (ret)
|
|
printk(PRINT_PREF "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) {
|
|
printk(PRINT_PREF "error: cannot allocate memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
printk(PRINT_PREF "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();
|
|
}
|
|
printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
|
|
return 0;
|
|
}
|
|
|
|
static int __init mtd_subpagetest_init(void)
|
|
{
|
|
int err = 0;
|
|
uint32_t i;
|
|
uint64_t tmp;
|
|
|
|
printk(KERN_INFO "\n");
|
|
printk(KERN_INFO "=================================================\n");
|
|
|
|
if (dev < 0) {
|
|
printk(PRINT_PREF "Please specify a valid mtd-device via module paramter\n");
|
|
printk(KERN_CRIT "CAREFUL: This test wipes all data on the specified MTD device!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
printk(PRINT_PREF "MTD device: %d\n", dev);
|
|
|
|
mtd = get_mtd_device(NULL, dev);
|
|
if (IS_ERR(mtd)) {
|
|
err = PTR_ERR(mtd);
|
|
printk(PRINT_PREF "error: cannot get MTD device\n");
|
|
return err;
|
|
}
|
|
|
|
if (mtd->type != MTD_NANDFLASH) {
|
|
printk(PRINT_PREF "this test requires NAND flash\n");
|
|
goto out;
|
|
}
|
|
|
|
subpgsize = mtd->writesize >> mtd->subpage_sft;
|
|
tmp = mtd->size;
|
|
do_div(tmp, mtd->erasesize);
|
|
ebcnt = tmp;
|
|
pgcnt = mtd->erasesize / mtd->writesize;
|
|
|
|
printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
|
|
"page size %u, subpage size %u, count of eraseblocks %u, "
|
|
"pages per eraseblock %u, OOB size %u\n",
|
|
(unsigned long long)mtd->size, mtd->erasesize,
|
|
mtd->writesize, subpgsize, ebcnt, pgcnt, mtd->oobsize);
|
|
|
|
err = -ENOMEM;
|
|
bufsize = subpgsize * 32;
|
|
writebuf = kmalloc(bufsize, GFP_KERNEL);
|
|
if (!writebuf) {
|
|
printk(PRINT_PREF "error: cannot allocate memory\n");
|
|
goto out;
|
|
}
|
|
readbuf = kmalloc(bufsize, GFP_KERNEL);
|
|
if (!readbuf) {
|
|
printk(PRINT_PREF "error: cannot allocate memory\n");
|
|
goto out;
|
|
}
|
|
|
|
err = scan_for_bad_eraseblocks();
|
|
if (err)
|
|
goto out;
|
|
|
|
err = erase_whole_device();
|
|
if (err)
|
|
goto out;
|
|
|
|
printk(PRINT_PREF "writing whole device\n");
|
|
simple_srand(1);
|
|
for (i = 0; i < ebcnt; ++i) {
|
|
if (bbt[i])
|
|
continue;
|
|
err = write_eraseblock(i);
|
|
if (unlikely(err))
|
|
goto out;
|
|
if (i % 256 == 0)
|
|
printk(PRINT_PREF "written up to eraseblock %u\n", i);
|
|
cond_resched();
|
|
}
|
|
printk(PRINT_PREF "written %u eraseblocks\n", i);
|
|
|
|
simple_srand(1);
|
|
printk(PRINT_PREF "verifying all eraseblocks\n");
|
|
for (i = 0; i < ebcnt; ++i) {
|
|
if (bbt[i])
|
|
continue;
|
|
err = verify_eraseblock(i);
|
|
if (unlikely(err))
|
|
goto out;
|
|
if (i % 256 == 0)
|
|
printk(PRINT_PREF "verified up to eraseblock %u\n", i);
|
|
cond_resched();
|
|
}
|
|
printk(PRINT_PREF "verified %u eraseblocks\n", i);
|
|
|
|
err = erase_whole_device();
|
|
if (err)
|
|
goto out;
|
|
|
|
err = verify_all_eraseblocks_ff();
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Write all eraseblocks */
|
|
simple_srand(3);
|
|
printk(PRINT_PREF "writing whole device\n");
|
|
for (i = 0; i < ebcnt; ++i) {
|
|
if (bbt[i])
|
|
continue;
|
|
err = write_eraseblock2(i);
|
|
if (unlikely(err))
|
|
goto out;
|
|
if (i % 256 == 0)
|
|
printk(PRINT_PREF "written up to eraseblock %u\n", i);
|
|
cond_resched();
|
|
}
|
|
printk(PRINT_PREF "written %u eraseblocks\n", i);
|
|
|
|
/* Check all eraseblocks */
|
|
simple_srand(3);
|
|
printk(PRINT_PREF "verifying all eraseblocks\n");
|
|
for (i = 0; i < ebcnt; ++i) {
|
|
if (bbt[i])
|
|
continue;
|
|
err = verify_eraseblock2(i);
|
|
if (unlikely(err))
|
|
goto out;
|
|
if (i % 256 == 0)
|
|
printk(PRINT_PREF "verified up to eraseblock %u\n", i);
|
|
cond_resched();
|
|
}
|
|
printk(PRINT_PREF "verified %u eraseblocks\n", i);
|
|
|
|
err = erase_whole_device();
|
|
if (err)
|
|
goto out;
|
|
|
|
err = verify_all_eraseblocks_ff();
|
|
if (err)
|
|
goto out;
|
|
|
|
printk(PRINT_PREF "finished with %d errors\n", errcnt);
|
|
|
|
out:
|
|
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");
|