// 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");