MTD: tests: add mtd_speedtest

This test examines I/O speed of the flash device.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 502 insertions, 0 deletions

diff --git a/drivers/mtd/tests/mtd_speedtest.c b/drivers/mtd/tests/mtd_speedtest.c
new file mode 100644
index 000000000000..141363a7e805
--- /dev/null
+++ b/drivers/mtd/tests/mtd_speedtest.c
@@ -0,0 +1,502 @@
+/*
+ * 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 <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/sched.h>
+
+#define PRINT_PREF KERN_INFO "mtd_speedtest: "
+
+static int dev;
+module_param(dev, int, S_IRUGO);
+MODULE_PARM_DESC(dev, "MTD device number to use");
+
+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 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 (err == -EUCLEAN)
+                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 (err == -EUCLEAN)
+                        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 (err == -EUCLEAN)
+                        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 (err == -EUCLEAN)
+                        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)
+{
+        long ms, k, speed;
+
+        ms = (finish.tv_sec - start.tv_sec) * 1000 +
+             (finish.tv_usec - start.tv_usec) / 1000;
+        k = goodebcnt * mtd->erasesize / 1024;
+        speed = (k * 1000) / ms;
+        return speed;
+}
+
+static int scan_for_bad_eraseblocks(void)
+{
+        int i, bad = 0;
+
+        bbt = kmalloc(ebcnt, GFP_KERNEL);
+        if (!bbt) {
+                printk(PRINT_PREF "error: cannot allocate memory\n");
+                return -ENOMEM;
+        }
+        memset(bbt, 0 , ebcnt);
+
+        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);
+        goodebcnt = ebcnt - bad;
+        return 0;
+}
+
+static int __init mtd_speedtest_init(void)
+{
+        int err, i;
+        long speed;
+        uint64_t tmp;
+
+        printk(KERN_INFO "\n");
+        printk(KERN_INFO "=================================================\n");
+        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 / mtd->writesize;
+
+        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);
+
+        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);
+
+        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");