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linux/drivers/mtd/tests/mtd_speedtest.c
Wolfram Sang 7406060e29 mtd: tests: don't use mtd0 as a default 
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>
2011-10-30 14:31:04 +02:00

580 lines
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/*
* 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>
*/
#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_speedtest: "
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 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 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 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) {
printk(PRINT_PREF "error %d while erasing EB %d, blocks %d\n",
err, ebnum, blocks);
return err;
}
if (ei.state == MTD_ERASE_FAILED) {
printk(PRINT_PREF "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 = 0;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
if (err || written != mtd->erasesize) {
printk(PRINT_PREF "error: write failed at %#llx\n", addr);
if (!err)
err = -EINVAL;
}
return err;
}
static int write_eraseblock_by_page(int ebnum)
{
size_t written = 0;
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) {
printk(PRINT_PREF "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 = 0, 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) {
printk(PRINT_PREF "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) {
printk(PRINT_PREF "error: write failed at %#llx\n",
addr);
if (!err)
err = -EINVAL;
}
}
return err;
}
static int read_eraseblock(int ebnum)
{
size_t read = 0;
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) {
printk(PRINT_PREF "error: read failed at %#llx\n", addr);
if (!err)
err = -EINVAL;
}
return err;
}
static int read_eraseblock_by_page(int ebnum)
{
size_t read = 0;
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) {
printk(PRINT_PREF "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 = 0, 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) {
printk(PRINT_PREF "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) {
printk(PRINT_PREF "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)
printk(PRINT_PREF "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) {
printk(PRINT_PREF "error: cannot allocate memory\n");
return -ENOMEM;
}
/* NOR flash does not implement block_isbad */
if (mtd->block_isbad == NULL)
goto out;
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);
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) {
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;
}
if (count)
printk(PRINT_PREF "MTD device: %d count: %d\n", dev, count);
else
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->writesize == 1) {
printk(PRINT_PREF "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;
printk(PRINT_PREF "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) {
printk(PRINT_PREF "error: cannot allocate memory\n");
goto out;
}
simple_srand(1);
set_random_data(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 */
printk(PRINT_PREF "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();
printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
/* Read all eraseblocks, 1 eraseblock at a time */
printk(PRINT_PREF "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();
printk(PRINT_PREF "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 */
printk(PRINT_PREF "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();
printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
/* Read all eraseblocks, 1 page at a time */
printk(PRINT_PREF "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();
printk(PRINT_PREF "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 */
printk(PRINT_PREF "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();
printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
/* Read all eraseblocks, 2 pages at a time */
printk(PRINT_PREF "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();
printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
/* Erase all eraseblocks */
printk(PRINT_PREF "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();
printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
/* Multi-block erase all eraseblocks */
for (k = 1; k < 7; k++) {
blocks = 1 << k;
printk(PRINT_PREF "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();
printk(PRINT_PREF "%dx multi-block erase speed is %ld KiB/s\n",
blocks, speed);
}
printk(PRINT_PREF "finished\n");
out:
kfree(iobuf);
kfree(bbt);
put_mtd_device(mtd);
if (err)
printk(PRINT_PREF "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");
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