MTD: tests: add mtd_speedtest
This test examines I/O speed of the flash device. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy
parent
72091b6889
commit
72069be936
502
drivers/mtd/tests/mtd_speedtest.c
Normal file
502
drivers/mtd/tests/mtd_speedtest.c
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@ -0,0 +1,502 @@
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/*
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* Copyright (C) 2007 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; see the file COPYING. If not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Test read and write speed of a MTD device.
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*
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* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/err.h>
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#include <linux/mtd/mtd.h>
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#include <linux/sched.h>
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#define PRINT_PREF KERN_INFO "mtd_speedtest: "
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static int dev;
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module_param(dev, int, S_IRUGO);
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MODULE_PARM_DESC(dev, "MTD device number to use");
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static struct mtd_info *mtd;
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static unsigned char *iobuf;
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static unsigned char *bbt;
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static int pgsize;
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static int ebcnt;
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static int pgcnt;
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static int goodebcnt;
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static struct timeval start, finish;
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static unsigned long next = 1;
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static inline unsigned int simple_rand(void)
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{
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next = next * 1103515245 + 12345;
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return (unsigned int)((next / 65536) % 32768);
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}
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static inline void simple_srand(unsigned long seed)
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{
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next = seed;
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}
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static void set_random_data(unsigned char *buf, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i)
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buf[i] = simple_rand();
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}
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static int erase_eraseblock(int ebnum)
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{
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int err;
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struct erase_info ei;
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loff_t addr = ebnum * mtd->erasesize;
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memset(&ei, 0, sizeof(struct erase_info));
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ei.mtd = mtd;
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ei.addr = addr;
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ei.len = mtd->erasesize;
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err = mtd->erase(mtd, &ei);
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if (err) {
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printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
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return err;
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}
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if (ei.state == MTD_ERASE_FAILED) {
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printk(PRINT_PREF "some erase error occurred at EB %d\n",
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ebnum);
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return -EIO;
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}
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return 0;
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}
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static int erase_whole_device(void)
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{
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int err;
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unsigned int i;
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = erase_eraseblock(i);
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if (err)
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return err;
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cond_resched();
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}
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return 0;
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}
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static int write_eraseblock(int ebnum)
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{
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size_t written = 0;
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int err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
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if (err || written != mtd->erasesize) {
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printk(PRINT_PREF "error: write failed at %#llx\n", addr);
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if (!err)
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err = -EINVAL;
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}
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return err;
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}
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static int write_eraseblock_by_page(int ebnum)
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{
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size_t written = 0;
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int i, err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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void *buf = iobuf;
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for (i = 0; i < pgcnt; i++) {
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err = mtd->write(mtd, addr, pgsize, &written, buf);
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if (err || written != pgsize) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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addr);
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if (!err)
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err = -EINVAL;
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break;
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}
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addr += pgsize;
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buf += pgsize;
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}
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return err;
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}
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static int write_eraseblock_by_2pages(int ebnum)
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{
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size_t written = 0, sz = pgsize * 2;
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int i, n = pgcnt / 2, err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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void *buf = iobuf;
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for (i = 0; i < n; i++) {
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err = mtd->write(mtd, addr, sz, &written, buf);
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if (err || written != sz) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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addr);
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if (!err)
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err = -EINVAL;
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return err;
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}
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addr += sz;
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buf += sz;
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}
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if (pgcnt % 2) {
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err = mtd->write(mtd, addr, pgsize, &written, buf);
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if (err || written != pgsize) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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addr);
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if (!err)
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err = -EINVAL;
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}
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}
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return err;
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}
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static int read_eraseblock(int ebnum)
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{
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size_t read = 0;
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int err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
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/* Ignore corrected ECC errors */
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if (err == -EUCLEAN)
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err = 0;
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if (err || read != mtd->erasesize) {
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printk(PRINT_PREF "error: read failed at %#llx\n", addr);
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if (!err)
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err = -EINVAL;
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}
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return err;
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}
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static int read_eraseblock_by_page(int ebnum)
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{
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size_t read = 0;
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int i, err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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void *buf = iobuf;
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for (i = 0; i < pgcnt; i++) {
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err = mtd->read(mtd, addr, pgsize, &read, buf);
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/* Ignore corrected ECC errors */
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if (err == -EUCLEAN)
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err = 0;
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if (err || read != pgsize) {
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printk(PRINT_PREF "error: read failed at %#llx\n",
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addr);
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if (!err)
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err = -EINVAL;
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break;
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}
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addr += pgsize;
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buf += pgsize;
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}
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return err;
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}
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static int read_eraseblock_by_2pages(int ebnum)
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{
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size_t read = 0, sz = pgsize * 2;
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int i, n = pgcnt / 2, err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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void *buf = iobuf;
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for (i = 0; i < n; i++) {
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err = mtd->read(mtd, addr, sz, &read, buf);
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/* Ignore corrected ECC errors */
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if (err == -EUCLEAN)
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err = 0;
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if (err || read != sz) {
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printk(PRINT_PREF "error: read failed at %#llx\n",
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addr);
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if (!err)
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err = -EINVAL;
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return err;
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}
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addr += sz;
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buf += sz;
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}
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if (pgcnt % 2) {
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err = mtd->read(mtd, addr, pgsize, &read, buf);
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/* Ignore corrected ECC errors */
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if (err == -EUCLEAN)
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err = 0;
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if (err || read != pgsize) {
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printk(PRINT_PREF "error: read failed at %#llx\n",
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addr);
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if (!err)
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err = -EINVAL;
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}
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}
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return err;
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}
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static int is_block_bad(int ebnum)
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{
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loff_t addr = ebnum * mtd->erasesize;
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int ret;
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ret = mtd->block_isbad(mtd, addr);
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if (ret)
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printk(PRINT_PREF "block %d is bad\n", ebnum);
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return ret;
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}
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static inline void start_timing(void)
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{
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do_gettimeofday(&start);
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}
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static inline void stop_timing(void)
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{
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do_gettimeofday(&finish);
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}
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static long calc_speed(void)
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{
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long ms, k, speed;
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ms = (finish.tv_sec - start.tv_sec) * 1000 +
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(finish.tv_usec - start.tv_usec) / 1000;
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k = goodebcnt * mtd->erasesize / 1024;
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speed = (k * 1000) / ms;
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return speed;
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}
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static int scan_for_bad_eraseblocks(void)
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{
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int i, bad = 0;
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bbt = kmalloc(ebcnt, GFP_KERNEL);
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if (!bbt) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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return -ENOMEM;
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}
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memset(bbt, 0 , ebcnt);
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printk(PRINT_PREF "scanning for bad eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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bbt[i] = is_block_bad(i) ? 1 : 0;
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if (bbt[i])
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bad += 1;
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cond_resched();
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}
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printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
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goodebcnt = ebcnt - bad;
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return 0;
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}
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static int __init mtd_speedtest_init(void)
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{
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int err, i;
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long speed;
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uint64_t tmp;
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printk(KERN_INFO "\n");
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printk(KERN_INFO "=================================================\n");
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printk(PRINT_PREF "MTD device: %d\n", dev);
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mtd = get_mtd_device(NULL, dev);
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if (IS_ERR(mtd)) {
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err = PTR_ERR(mtd);
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printk(PRINT_PREF "error: cannot get MTD device\n");
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return err;
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}
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if (mtd->writesize == 1) {
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printk(PRINT_PREF "not NAND flash, assume page size is 512 "
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"bytes.\n");
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pgsize = 512;
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} else
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pgsize = mtd->writesize;
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tmp = mtd->size;
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do_div(tmp, mtd->erasesize);
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ebcnt = tmp;
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pgcnt = mtd->erasesize / mtd->writesize;
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printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
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"page size %u, count of eraseblocks %u, pages per "
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"eraseblock %u, OOB size %u\n",
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(unsigned long long)mtd->size, mtd->erasesize,
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pgsize, ebcnt, pgcnt, mtd->oobsize);
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err = -ENOMEM;
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iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!iobuf) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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goto out;
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}
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simple_srand(1);
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set_random_data(iobuf, mtd->erasesize);
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err = scan_for_bad_eraseblocks();
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if (err)
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goto out;
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err = erase_whole_device();
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if (err)
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goto out;
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/* Write all eraseblocks, 1 eraseblock at a time */
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printk(PRINT_PREF "testing eraseblock write speed\n");
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start_timing();
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = write_eraseblock(i);
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if (err)
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goto out;
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cond_resched();
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}
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stop_timing();
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speed = calc_speed();
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printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
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/* Read all eraseblocks, 1 eraseblock at a time */
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printk(PRINT_PREF "testing eraseblock read speed\n");
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start_timing();
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = read_eraseblock(i);
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if (err)
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goto out;
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cond_resched();
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}
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stop_timing();
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speed = calc_speed();
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printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
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err = erase_whole_device();
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if (err)
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goto out;
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/* Write all eraseblocks, 1 page at a time */
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printk(PRINT_PREF "testing page write speed\n");
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start_timing();
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = write_eraseblock_by_page(i);
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if (err)
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goto out;
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cond_resched();
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}
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stop_timing();
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speed = calc_speed();
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printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
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/* Read all eraseblocks, 1 page at a time */
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printk(PRINT_PREF "testing page read speed\n");
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start_timing();
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = read_eraseblock_by_page(i);
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if (err)
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goto out;
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cond_resched();
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}
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stop_timing();
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speed = calc_speed();
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printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
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err = erase_whole_device();
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if (err)
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goto out;
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/* Write all eraseblocks, 2 pages at a time */
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printk(PRINT_PREF "testing 2 page write speed\n");
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start_timing();
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = write_eraseblock_by_2pages(i);
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if (err)
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goto out;
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cond_resched();
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}
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stop_timing();
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speed = calc_speed();
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printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
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/* Read all eraseblocks, 2 pages at a time */
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printk(PRINT_PREF "testing 2 page read speed\n");
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start_timing();
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = read_eraseblock_by_2pages(i);
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if (err)
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goto out;
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cond_resched();
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}
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stop_timing();
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speed = calc_speed();
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printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
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/* Erase all eraseblocks */
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printk(PRINT_PREF "Testing erase speed\n");
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start_timing();
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = erase_eraseblock(i);
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if (err)
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goto out;
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cond_resched();
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}
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stop_timing();
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speed = calc_speed();
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printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
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printk(PRINT_PREF "finished\n");
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out:
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kfree(iobuf);
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kfree(bbt);
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put_mtd_device(mtd);
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if (err)
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printk(PRINT_PREF "error %d occurred\n", err);
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printk(KERN_INFO "=================================================\n");
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return err;
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}
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module_init(mtd_speedtest_init);
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static void __exit mtd_speedtest_exit(void)
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{
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return;
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}
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module_exit(mtd_speedtest_exit);
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MODULE_DESCRIPTION("Speed test module");
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MODULE_AUTHOR("Adrian Hunter");
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MODULE_LICENSE("GPL");
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