| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2007 Nokia Corporation |
| * |
| * 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/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; |
| |
| /* 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; |
| |
| err = mtdtest_relax(); |
| if (err) |
| goto out; |
| } |
| 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; |
| |
| 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; |
| |
| /* 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; |
| |
| err = mtdtest_relax(); |
| if (err) |
| goto out; |
| } |
| 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; |
| |
| 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; |
| |
| /* 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; |
| |
| err = mtdtest_relax(); |
| if (err) |
| goto out; |
| } |
| 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; |
| |
| err = mtdtest_relax(); |
| if (err) |
| goto out; |
| } |
| 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(); |
| 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); |
| |
| /* 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; |
| |
| 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"); |
