- 根目录:
- drivers
- mtd
- tests
- mtd_speedtest.c
/*
* Copyright (C) 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 read and write speed of a MTD device.
*
* Author: Adrian Hunter <adrian.hunter@nokia.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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 int count;
module_param(count, int, S_IRUGO);
MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
"(0 means use all)");
static struct mtd_info *mtd;
static unsigned char *iobuf;
static unsigned char *bbt;
static int pgsize;
static int ebcnt;
static int pgcnt;
static int goodebcnt;
static struct timeval start, finish;
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 multiblock_erase(int ebnum, int blocks)
{
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 * blocks;
err = mtd_erase(mtd, &ei);
if (err) {
pr_err("error %d while erasing EB %d, blocks %d\n",
err, ebnum, blocks);
return err;
}
if (ei.state == MTD_ERASE_FAILED) {
pr_err("some erase error occurred at EB %d,"
"blocks %d\n", ebnum, blocks);
return -EIO;
}
return 0;
}
static int erase_whole_device(void)
{
int err;
unsigned int i;
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = erase_eraseblock(i);
if (err)
return err;
cond_resched();
}
return 0;
}
static int write_eraseblock(int ebnum)
{
size_t written;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
err = mtd_write(mtd, addr, mtd->erasesize, &written, iobuf);
if (err || written != mtd->erasesize) {
pr_err("error: write failed at %#llx\n", addr);
if (!err)
err = -EINVAL;
}
return err;
}
static int write_eraseblock_by_page(int ebnum)
{
size_t written;
int i, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < pgcnt; i++) {
err = mtd_write(mtd, addr, pgsize, &written, buf);
if (err || written != pgsize) {
pr_err("error: write failed at %#llx\n",
addr);
if (!err)
err = -EINVAL;
break;
}
addr += pgsize;
buf += pgsize;
}
return err;
}
static int write_eraseblock_by_2pages(int ebnum)
{
size_t written, sz = pgsize * 2;
int i, n = pgcnt / 2, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < n; i++) {
err = mtd_write(mtd, addr, sz, &written, buf);
if (err || written != sz) {
pr_err("error: write failed at %#llx\n",
addr);
if (!err)
err = -EINVAL;
return err;
}
addr += sz;
buf += sz;
}
if (pgcnt % 2) {
err = mtd_write(mtd, addr, pgsize, &written, buf);
if (err || written != pgsize) {
pr_err("error: write failed at %#llx\n",
addr);
if (!err)
err = -EINVAL;
}
}
return err;
}
static int read_eraseblock(int ebnum)
{
size_t read;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
err = mtd_read(mtd, addr, mtd->erasesize, &read, iobuf);
/* Ignore corrected ECC errors */
if (mtd_is_bitflip(err))
err = 0;
if (err || read != mtd->erasesize) {
pr_err("error: read failed at %#llx\n", addr);
if (!err)
err = -EINVAL;
}
return err;
}
static int read_eraseblock_by_page(int ebnum)
{
size_t read;
int i, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < pgcnt; i++) {
err = mtd_read(mtd, addr, pgsize, &read, buf);
/* Ignore corrected ECC errors */
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
addr);
if (!err)
err = -EINVAL;
break;
}
addr += pgsize;
buf += pgsize;
}
return err;
}
static int read_eraseblock_by_2pages(int ebnum)
{
size_t read, sz = pgsize * 2;
int i, n = pgcnt / 2, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < n; i++) {
err = mtd_read(mtd, addr, sz, &read, buf);
/* Ignore corrected ECC errors */
if (mtd_is_bitflip(err))
err = 0;
if (err || read != sz) {
pr_err("error: read failed at %#llx\n",
addr);
if (!err)
err = -EINVAL;
return err;
}
addr += sz;
buf += sz;
}
if (pgcnt % 2) {
err = mtd_read(mtd, addr, pgsize, &read, buf);
/* Ignore corrected ECC errors */
if (mtd_is_bitflip(err))
err = 0;
if (err || read != pgsize) {
pr_err("error: read failed at %#llx\n",
addr);
if (!err)
err = -EINVAL;
}
}
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 inline void start_timing(void)
{
do_gettimeofday(&start);
}
static inline void stop_timing(void)
{
do_gettimeofday(&finish);
}
static long calc_speed(void)
{
uint64_t k;
long ms;
ms = (finish.tv_sec - start.tv_sec) * 1000 +
(finish.tv_usec - start.tv_usec) / 1000;
if (ms == 0)
return 0;
k = goodebcnt * (mtd->erasesize / 1024) * 1000;
do_div(k, ms);
return k;
}
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;
}
if (!mtd_can_have_bb(mtd))
goto out;
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);
out:
goodebcnt = ebcnt - bad;
return 0;
}
static int __init mtd_speedtest_init(void)
{
int err, i, blocks, j, k;
long speed;
uint64_t tmp;
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;
}
if (count)
pr_info("MTD device: %d count: %d\n", dev, count);
else
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->writesize == 1) {
pr_info("not NAND flash, assume page size is 512 "
"bytes.\n");
pgsize = 512;
} else
pgsize = mtd->writesize;
tmp = mtd->size;
do_div(tmp, mtd->erasesize);
ebcnt = tmp;
pgcnt = mtd->erasesize / pgsize;
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);
if (count > 0 && count < ebcnt)
ebcnt = count;
err = -ENOMEM;
iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
if (!iobuf) {
pr_err("error: cannot allocate memory\n");
goto out;
}
prandom_bytes(iobuf, mtd->erasesize);
err = scan_for_bad_eraseblocks();
if (err)
goto out;
err = erase_whole_device();
if (err)
goto out;
/* Write all eraseblocks, 1 eraseblock at a time */
pr_info("testing eraseblock write speed\n");
start_timing();
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = write_eraseblock(i);
if (err)
goto out;
cond_resched();
}
stop_timing();
speed = calc_speed();
pr_info("eraseblock write speed is %ld KiB/s\n", speed);
/* Read all eraseblocks, 1 eraseblock at a time */
pr_info("testing eraseblock read speed\n");
start_timing();
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = read_eraseblock(i);
if (err)
goto out;
cond_resched();
}
stop_timing();
speed = calc_speed();
pr_info("eraseblock read speed is %ld KiB/s\n", speed);
err = erase_whole_device();
if (err)
goto out;
/* Write all eraseblocks, 1 page at a time */
pr_info("testing page write speed\n");
start_timing();
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = write_eraseblock_by_page(i);
if (err)
goto out;
cond_resched();
}
stop_timing();
speed = calc_speed();
pr_info("page write speed is %ld KiB/s\n", speed);
/* Read all eraseblocks, 1 page at a time */
pr_info("testing page read speed\n");
start_timing();
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = read_eraseblock_by_page(i);
if (err)
goto out;
cond_resched();
}
stop_timing();
speed = calc_speed();
pr_info("page read speed is %ld KiB/s\n", speed);
err = erase_whole_device();
if (err)
goto out;
/* Write all eraseblocks, 2 pages at a time */
pr_info("testing 2 page write speed\n");
start_timing();
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = write_eraseblock_by_2pages(i);
if (err)
goto out;
cond_resched();
}
stop_timing();
speed = calc_speed();
pr_info("2 page write speed is %ld KiB/s\n", speed);
/* Read all eraseblocks, 2 pages at a time */
pr_info("testing 2 page read speed\n");
start_timing();
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = read_eraseblock_by_2pages(i);
if (err)
goto out;
cond_resched();
}
stop_timing();
speed = calc_speed();
pr_info("2 page read speed is %ld KiB/s\n", speed);
/* Erase all eraseblocks */
pr_info("Testing erase speed\n");
start_timing();
for (i = 0; i < ebcnt; ++i) {
if (bbt[i])
continue;
err = erase_eraseblock(i);
if (err)
goto out;
cond_resched();
}
stop_timing();
speed = calc_speed();
pr_info("erase speed is %ld KiB/s\n", speed);
/* Multi-block erase all eraseblocks */
for (k = 1; k < 7; k++) {
blocks = 1 << k;
pr_info("Testing %dx multi-block erase speed\n",
blocks);
start_timing();
for (i = 0; i < ebcnt; ) {
for (j = 0; j < blocks && (i + j) < ebcnt; j++)
if (bbt[i + j])
break;
if (j < 1) {
i++;
continue;
}
err = multiblock_erase(i, j);
if (err)
goto out;
cond_resched();
i += j;
}
stop_timing();
speed = calc_speed();
pr_info("%dx multi-block erase speed is %ld KiB/s\n",
blocks, speed);
}
pr_info("finished\n");
out:
kfree(iobuf);
kfree(bbt);
put_mtd_device(mtd);
if (err)
pr_info("error %d occurred\n", err);
printk(KERN_INFO "=================================================\n");
return err;
}
module_init(mtd_speedtest_init);
static void __exit mtd_speedtest_exit(void)
{
return;
}
module_exit(mtd_speedtest_exit);
MODULE_DESCRIPTION("Speed test module");
MODULE_AUTHOR("Adrian Hunter");
MODULE_LICENSE("GPL");