diff options
Diffstat (limited to 'drivers/mtd/tests/speedtest.c')
| -rw-r--r-- | drivers/mtd/tests/speedtest.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/drivers/mtd/tests/speedtest.c b/drivers/mtd/tests/speedtest.c new file mode 100644 index 000000000000..20b63d1ad494 --- /dev/null +++ b/drivers/mtd/tests/speedtest.c @@ -0,0 +1,556 @@ +/* + * 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) + 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) + 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"); |