#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/ktime.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 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 ktime_t start, finish;
static int multiblock_erase(int ebnum, int blocks)
{
int err;
struct erase_info ei;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
memset(&ei, 0, sizeof(struct erase_info));
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;
}
return 0;
}
static int write_eraseblock(int ebnum)
{
loff_t addr = (loff_t)ebnum * mtd->erasesize;
return mtdtest_write(mtd, addr, mtd->erasesize, iobuf);
}
static int write_eraseblock_by_page(int ebnum)
{
int i, err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < pgcnt; i++) {
err = mtdtest_write(mtd, addr, pgsize, buf);
if (err)
break;
addr += pgsize;
buf += pgsize;
}
return err;
}
static int write_eraseblock_by_2pages(int ebnum)
{
size_t sz = pgsize * 2;
int i, n = pgcnt / 2, err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < n; i++) {
err = mtdtest_write(mtd, addr, sz, buf);
if (err)
return err;
addr += sz;
buf += sz;
}
if (pgcnt % 2)
err = mtdtest_write(mtd, addr, pgsize, buf);
return err;
}
static int read_eraseblock(int ebnum)
{
loff_t addr = (loff_t)ebnum * mtd->erasesize;
return mtdtest_read(mtd, addr, mtd->erasesize, iobuf);
}
static int read_eraseblock_by_page(int ebnum)
{
int i, err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < pgcnt; i++) {
err = mtdtest_read(mtd, addr, pgsize, buf);
if (err)
break;
addr += pgsize;
buf += pgsize;
}
return err;
}
static int read_eraseblock_by_2pages(int ebnum)
{
size_t sz = pgsize * 2;
int i, n = pgcnt / 2, err = 0;
loff_t addr = (loff_t)ebnum * mtd->erasesize;
void *buf = iobuf;
for (i = 0; i < n; i++) {
err = mtdtest_read(mtd, addr, sz, buf);
if (err)
return err;
addr += sz;
buf += sz;
}
if (pgcnt % 2)
err = mtdtest_read(mtd, addr, pgsize, buf);
return err;
}
static inline void start_timing(void)
{
start = ktime_get();
}
static inline void stop_timing(void)
{
finish = ktime_get();
}
static long calc_speed(void)
{
uint64_t k, us;
us = ktime_us_delta(finish, start);
if (us == 0)
return 0;
k = (uint64_t)goodebcnt * (mtd->erasesize / 1024) * 1000000;
do_div(k, us);
return k;
}
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)
goto out;
get_random_bytes(iobuf, mtd->erasesize);
bbt = kzalloc(ebcnt, GFP_KERNEL);
if (!bbt)
goto out;
err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
for (i = 0; i < ebcnt; i++) {
if (!bbt[i])
goodebcnt++;
}
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
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;
err = mtdtest_relax();
if (err)
goto out;
}
stop_timing();
speed = calc_speed();
pr_info("eraseblock write speed is %ld KiB/s\n", speed);
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;
err = mtdtest_relax();
if (err)
goto out;
}
stop_timing();
speed = calc_speed();
pr_info("eraseblock read speed is %ld KiB/s\n", speed);
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
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;
err = mtdtest_relax();
if (err)
goto out;
}
stop_timing();
speed = calc_speed();
pr_info("page write speed is %ld KiB/s\n", speed);
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;
err = mtdtest_relax();
if (err)
goto out;
}
stop_timing();
speed = calc_speed();
pr_info("page read speed is %ld KiB/s\n", speed);
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
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;
err = mtdtest_relax();
if (err)
goto out;
}
stop_timing();
speed = calc_speed();
pr_info("2 page write speed is %ld KiB/s\n", speed);
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;
err = mtdtest_relax();
if (err)
goto out;
}
stop_timing();
speed = calc_speed();
pr_info("2 page read speed is %ld KiB/s\n", speed);
pr_info("Testing erase speed\n");
start_timing();
err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
if (err)
goto out;
stop_timing();
speed = calc_speed();
pr_info("erase speed is %ld KiB/s\n", speed);
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;
err = mtdtest_relax();
if (err)
goto out;
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");
