[deliverable/linux.git] / drivers / mtd / tests / mtd_speedtest.c

/*
 * 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>
 */

#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>

#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 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 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 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) {
		printk(PRINT_PREF "error %d while erasing EB %d, blocks %d\n",
		       err, ebnum, blocks);
		return err;
	}

	if (ei.state == MTD_ERASE_FAILED) {
		printk(PRINT_PREF "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 = 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 (mtd_is_bitflip(err))
		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 (mtd_is_bitflip(err))
			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 (mtd_is_bitflip(err))
			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 (mtd_is_bitflip(err))
			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)
{
	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) {
		printk(PRINT_PREF "error: cannot allocate memory\n");
		return -ENOMEM;
	}

	/* NOR flash does not implement block_isbad */
	if (mtd->block_isbad == NULL)
		goto out;

	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);
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 (count)
		printk(PRINT_PREF "MTD device: %d    count: %d\n", dev, count);
	else
		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 / pgsize;

	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);

	if (count > 0 && count < ebcnt)
		ebcnt = count;

	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);

	/* Multi-block erase all eraseblocks */
	for (k = 1; k < 7; k++) {
		blocks = 1 << k;
		printk(PRINT_PREF "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();
		printk(PRINT_PREF "%dx multi-block erase speed is %ld KiB/s\n",
		       blocks, 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");
Commit	Line	Data
72069be9 AB	1	/*
	2	* Copyright (C) 2007 Nokia Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License version 2 as published by
	6	* the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; see the file COPYING. If not, write to the Free Software
	15	* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	16	*
	17	* Test read and write speed of a MTD device.
	18	*
fc7fe769	19	* Author: Adrian Hunter <adrian.hunter@nokia.com>
72069be9 AB	20	*/
	21
	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
	25	#include <linux/err.h>
	26	#include <linux/mtd/mtd.h>
5a0e3ad6	27	#include <linux/slab.h>
72069be9 AB	28	#include <linux/sched.h>
	29
	30	#define PRINT_PREF KERN_INFO "mtd_speedtest: "
	31
	32	static int dev;
	33	module_param(dev, int, S_IRUGO);
	34	MODULE_PARM_DESC(dev, "MTD device number to use");
	35
fc7fe769 AH	36	static int count;
	37	module_param(count, int, S_IRUGO);
	38	MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
	39	"(0 means use all)");
	40
72069be9 AB	41	static struct mtd_info *mtd;
	42	static unsigned char *iobuf;
	43	static unsigned char *bbt;
	44
	45	static int pgsize;
	46	static int ebcnt;
	47	static int pgcnt;
	48	static int goodebcnt;
	49	static struct timeval start, finish;
	50	static unsigned long next = 1;
	51
	52	static inline unsigned int simple_rand(void)
	53	{
	54	next = next * 1103515245 + 12345;
	55	return (unsigned int)((next / 65536) % 32768);
	56	}
	57
	58	static inline void simple_srand(unsigned long seed)
	59	{
	60	next = seed;
	61	}
	62
	63	static void set_random_data(unsigned char *buf, size_t len)
	64	{
	65	size_t i;
	66
	67	for (i = 0; i < len; ++i)
	68	buf[i] = simple_rand();
	69	}
	70
	71	static int erase_eraseblock(int ebnum)
	72	{
	73	int err;
	74	struct erase_info ei;
	75	loff_t addr = ebnum * mtd->erasesize;
	76
	77	memset(&ei, 0, sizeof(struct erase_info));
	78	ei.mtd = mtd;
	79	ei.addr = addr;
	80	ei.len = mtd->erasesize;
	81
	82	err = mtd->erase(mtd, &ei);
	83	if (err) {
	84	printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
	85	return err;
	86	}
	87
	88	if (ei.state == MTD_ERASE_FAILED) {
	89	printk(PRINT_PREF "some erase error occurred at EB %d\n",
	90	ebnum);
	91	return -EIO;
	92	}
	93
	94	return 0;
	95	}
	96
4085bcc6 RT	97	static int multiblock_erase(int ebnum, int blocks)
	98	{
	99	int err;
	100	struct erase_info ei;
	101	loff_t addr = ebnum * mtd->erasesize;
	102
	103	memset(&ei, 0, sizeof(struct erase_info));
	104	ei.mtd = mtd;
	105	ei.addr = addr;
	106	ei.len = mtd->erasesize * blocks;
	107
	108	err = mtd->erase(mtd, &ei);
	109	if (err) {
	110	printk(PRINT_PREF "error %d while erasing EB %d, blocks %d\n",
	111	err, ebnum, blocks);
	112	return err;
	113	}
	114
	115	if (ei.state == MTD_ERASE_FAILED) {
	116	printk(PRINT_PREF "some erase error occurred at EB %d,"
	117	"blocks %d\n", ebnum, blocks);
	118	return -EIO;
	119	}
	120
	121	return 0;
	122	}
	123
72069be9 AB	124	static int erase_whole_device(void)
	125	{
	126	int err;
	127	unsigned int i;
	128
	129	for (i = 0; i < ebcnt; ++i) {
	130	if (bbt[i])
	131	continue;
	132	err = erase_eraseblock(i);
	133	if (err)
	134	return err;
	135	cond_resched();
	136	}
	137	return 0;
	138	}
	139
	140	static int write_eraseblock(int ebnum)
	141	{
	142	size_t written = 0;
	143	int err = 0;
	144	loff_t addr = ebnum * mtd->erasesize;
	145
	146	err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
	147	if (err \|\| written != mtd->erasesize) {
	148	printk(PRINT_PREF "error: write failed at %#llx\n", addr);
	149	if (!err)
	150	err = -EINVAL;
	151	}
	152
	153	return err;
	154	}
	155
	156	static int write_eraseblock_by_page(int ebnum)
	157	{
	158	size_t written = 0;
	159	int i, err = 0;
	160	loff_t addr = ebnum * mtd->erasesize;
	161	void *buf = iobuf;
	162
	163	for (i = 0; i < pgcnt; i++) {
	164	err = mtd->write(mtd, addr, pgsize, &written, buf);
	165	if (err \|\| written != pgsize) {
	166	printk(PRINT_PREF "error: write failed at %#llx\n",
	167	addr);
	168	if (!err)
	169	err = -EINVAL;
	170	break;
	171	}
	172	addr += pgsize;
	173	buf += pgsize;
	174	}
	175
	176	return err;
	177	}
	178
	179	static int write_eraseblock_by_2pages(int ebnum)
	180	{
	181	size_t written = 0, sz = pgsize * 2;
	182	int i, n = pgcnt / 2, err = 0;
	183	loff_t addr = ebnum * mtd->erasesize;
	184	void *buf = iobuf;
	185
	186	for (i = 0; i < n; i++) {
	187	err = mtd->write(mtd, addr, sz, &written, buf);
188	if (err \|\| written != sz) {
189	printk(PRINT_PREF "error: write failed at %#llx\n",
190	addr);
191	if (!err)
192	err = -EINVAL;
193	return err;
194	}
195	addr += sz;
196	buf += sz;
197	}
198	if (pgcnt % 2) {
199	err = mtd->write(mtd, addr, pgsize, &written, buf);
200	if (err \|\| written != pgsize) {
201	printk(PRINT_PREF "error: write failed at %#llx\n",
202	addr);
203	if (!err)
204	err = -EINVAL;
205	}
206	}
207
208	return err;
209	}
210
211	static int read_eraseblock(int ebnum)
212	{
213	size_t read = 0;
214	int err = 0;
215	loff_t addr = ebnum * mtd->erasesize;
216
217	err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
218	/* Ignore corrected ECC errors */
d57f4054	219	if (mtd_is_bitflip(err))
72069be9 AB	220	err = 0;
	221	if (err \|\| read != mtd->erasesize) {
	222	printk(PRINT_PREF "error: read failed at %#llx\n", addr);
	223	if (!err)
	224	err = -EINVAL;
	225	}
	226
	227	return err;
	228	}
	229
	230	static int read_eraseblock_by_page(int ebnum)
	231	{
	232	size_t read = 0;
	233	int i, err = 0;
	234	loff_t addr = ebnum * mtd->erasesize;
	235	void *buf = iobuf;
	236
	237	for (i = 0; i < pgcnt; i++) {
	238	err = mtd->read(mtd, addr, pgsize, &read, buf);
	239	/* Ignore corrected ECC errors */
d57f4054	240	if (mtd_is_bitflip(err))
72069be9 AB	241	err = 0;
	242	if (err \|\| read != pgsize) {
	243	printk(PRINT_PREF "error: read failed at %#llx\n",
	244	addr);
	245	if (!err)
	246	err = -EINVAL;
	247	break;
	248	}
	249	addr += pgsize;
	250	buf += pgsize;
	251	}
	252
	253	return err;
	254	}
	255
	256	static int read_eraseblock_by_2pages(int ebnum)
	257	{
	258	size_t read = 0, sz = pgsize * 2;
	259	int i, n = pgcnt / 2, err = 0;
	260	loff_t addr = ebnum * mtd->erasesize;
	261	void *buf = iobuf;
	262
	263	for (i = 0; i < n; i++) {
	264	err = mtd->read(mtd, addr, sz, &read, buf);
	265	/* Ignore corrected ECC errors */
d57f4054	266	if (mtd_is_bitflip(err))
72069be9 AB	267	err = 0;
	268	if (err \|\| read != sz) {
	269	printk(PRINT_PREF "error: read failed at %#llx\n",
	270	addr);
	271	if (!err)
	272	err = -EINVAL;
	273	return err;
	274	}
	275	addr += sz;
	276	buf += sz;
	277	}
	278	if (pgcnt % 2) {
	279	err = mtd->read(mtd, addr, pgsize, &read, buf);
	280	/* Ignore corrected ECC errors */
d57f4054	281	if (mtd_is_bitflip(err))
72069be9 AB	282	err = 0;
	283	if (err \|\| read != pgsize) {
	284	printk(PRINT_PREF "error: read failed at %#llx\n",
	285	addr);
	286	if (!err)
	287	err = -EINVAL;
	288	}
	289	}
	290
	291	return err;
	292	}
	293
	294	static int is_block_bad(int ebnum)
	295	{
	296	loff_t addr = ebnum * mtd->erasesize;
	297	int ret;
	298
	299	ret = mtd->block_isbad(mtd, addr);
	300	if (ret)
	301	printk(PRINT_PREF "block %d is bad\n", ebnum);
	302	return ret;
	303	}
	304
	305	static inline void start_timing(void)
	306	{
	307	do_gettimeofday(&start);
	308	}
	309
	310	static inline void stop_timing(void)
	311	{
	312	do_gettimeofday(&finish);
	313	}
	314
	315	static long calc_speed(void)
	316	{
e70727e4 DL	317	uint64_t k;
e70727e4 DL	318	long ms;
72069be9 AB	319
	320	ms = (finish.tv_sec - start.tv_sec) * 1000 +
	321	(finish.tv_usec - start.tv_usec) / 1000;
e70727e4 DL	322	if (ms == 0)
	323	return 0;
	324	k = goodebcnt * (mtd->erasesize / 1024) * 1000;
	325	do_div(k, ms);
	326	return k;
72069be9 AB	327	}
	328
	329	static int scan_for_bad_eraseblocks(void)
	330	{
	331	int i, bad = 0;
	332
2bfefa4c	333	bbt = kzalloc(ebcnt, GFP_KERNEL);
72069be9 AB	334	if (!bbt) {
	335	printk(PRINT_PREF "error: cannot allocate memory\n");
	336	return -ENOMEM;
	337	}
72069be9	338
f5e2bae0 MTS	339	/* NOR flash does not implement block_isbad */
	340	if (mtd->block_isbad == NULL)
	341	goto out;
	342
72069be9 AB	343	printk(PRINT_PREF "scanning for bad eraseblocks\n");
	344	for (i = 0; i < ebcnt; ++i) {
	345	bbt[i] = is_block_bad(i) ? 1 : 0;
	346	if (bbt[i])
	347	bad += 1;
	348	cond_resched();
	349	}
	350	printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
f5e2bae0	351	out:
72069be9 AB	352	goodebcnt = ebcnt - bad;
	353	return 0;
	354	}
	355
	356	static int __init mtd_speedtest_init(void)
	357	{
4085bcc6	358	int err, i, blocks, j, k;
72069be9 AB	359	long speed;
	360	uint64_t tmp;
	361
	362	printk(KERN_INFO "\n");
	363	printk(KERN_INFO "=================================================\n");
fc7fe769 AH	364	if (count)
	365	printk(PRINT_PREF "MTD device: %d count: %d\n", dev, count);
	366	else
	367	printk(PRINT_PREF "MTD device: %d\n", dev);
72069be9 AB	368
	369	mtd = get_mtd_device(NULL, dev);
	370	if (IS_ERR(mtd)) {
	371	err = PTR_ERR(mtd);
	372	printk(PRINT_PREF "error: cannot get MTD device\n");
	373	return err;
	374	}
	375
	376	if (mtd->writesize == 1) {
	377	printk(PRINT_PREF "not NAND flash, assume page size is 512 "
	378	"bytes.\n");
	379	pgsize = 512;
	380	} else
	381	pgsize = mtd->writesize;
	382
	383	tmp = mtd->size;
	384	do_div(tmp, mtd->erasesize);
	385	ebcnt = tmp;
f5e2bae0	386	pgcnt = mtd->erasesize / pgsize;
72069be9 AB	387
	388	printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
	389	"page size %u, count of eraseblocks %u, pages per "
	390	"eraseblock %u, OOB size %u\n",
	391	(unsigned long long)mtd->size, mtd->erasesize,
	392	pgsize, ebcnt, pgcnt, mtd->oobsize);
	393
fc7fe769 AH	394	if (count > 0 && count < ebcnt)
	395	ebcnt = count;
	396
72069be9 AB	397	err = -ENOMEM;
	398	iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
	399	if (!iobuf) {
	400	printk(PRINT_PREF "error: cannot allocate memory\n");
	401	goto out;
	402	}
	403
	404	simple_srand(1);
	405	set_random_data(iobuf, mtd->erasesize);
	406
	407	err = scan_for_bad_eraseblocks();
	408	if (err)
	409	goto out;
	410
	411	err = erase_whole_device();
	412	if (err)
	413	goto out;
	414
	415	/* Write all eraseblocks, 1 eraseblock at a time */
	416	printk(PRINT_PREF "testing eraseblock write speed\n");
	417	start_timing();
	418	for (i = 0; i < ebcnt; ++i) {
	419	if (bbt[i])
	420	continue;
	421	err = write_eraseblock(i);
	422	if (err)
	423	goto out;
	424	cond_resched();
	425	}
	426	stop_timing();
	427	speed = calc_speed();
	428	printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
	429
	430	/* Read all eraseblocks, 1 eraseblock at a time */
	431	printk(PRINT_PREF "testing eraseblock read speed\n");
	432	start_timing();
	433	for (i = 0; i < ebcnt; ++i) {
	434	if (bbt[i])
	435	continue;
	436	err = read_eraseblock(i);
	437	if (err)
	438	goto out;
	439	cond_resched();
	440	}
	441	stop_timing();
	442	speed = calc_speed();
	443	printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
	444
	445	err = erase_whole_device();
	446	if (err)
	447	goto out;
	448
	449	/* Write all eraseblocks, 1 page at a time */
	450	printk(PRINT_PREF "testing page write speed\n");
	451	start_timing();
	452	for (i = 0; i < ebcnt; ++i) {
	453	if (bbt[i])
	454	continue;
	455	err = write_eraseblock_by_page(i);
	456	if (err)
	457	goto out;
	458	cond_resched();
	459	}
	460	stop_timing();
461	speed = calc_speed();
462	printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
463
464	/* Read all eraseblocks, 1 page at a time */
465	printk(PRINT_PREF "testing page read speed\n");
466	start_timing();
467	for (i = 0; i < ebcnt; ++i) {
468	if (bbt[i])
469	continue;
470	err = read_eraseblock_by_page(i);
471	if (err)
472	goto out;
473	cond_resched();
474	}
475	stop_timing();
476	speed = calc_speed();
477	printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
478
479	err = erase_whole_device();
480	if (err)
481	goto out;
482
483	/* Write all eraseblocks, 2 pages at a time */
484	printk(PRINT_PREF "testing 2 page write speed\n");
485	start_timing();
486	for (i = 0; i < ebcnt; ++i) {
487	if (bbt[i])
488	continue;
489	err = write_eraseblock_by_2pages(i);
490	if (err)
491	goto out;
492	cond_resched();
493	}
494	stop_timing();
495	speed = calc_speed();
496	printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
497
498	/* Read all eraseblocks, 2 pages at a time */
499	printk(PRINT_PREF "testing 2 page read speed\n");
500	start_timing();
501	for (i = 0; i < ebcnt; ++i) {
502	if (bbt[i])
503	continue;
504	err = read_eraseblock_by_2pages(i);
505	if (err)
506	goto out;
507	cond_resched();
508	}
509	stop_timing();
510	speed = calc_speed();
511	printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
512
513	/* Erase all eraseblocks */
514	printk(PRINT_PREF "Testing erase speed\n");
515	start_timing();
516	for (i = 0; i < ebcnt; ++i) {
517	if (bbt[i])
518	continue;
519	err = erase_eraseblock(i);
520	if (err)
521	goto out;
522	cond_resched();
523	}
524	stop_timing();
525	speed = calc_speed();
526	printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
527
4085bcc6 RT	528	/* Multi-block erase all eraseblocks */
	529	for (k = 1; k < 7; k++) {
	530	blocks = 1 << k;
	531	printk(PRINT_PREF "Testing %dx multi-block erase speed\n",
	532	blocks);
	533	start_timing();
	534	for (i = 0; i < ebcnt; ) {
	535	for (j = 0; j < blocks && (i + j) < ebcnt; j++)
	536	if (bbt[i + j])
	537	break;
	538	if (j < 1) {
	539	i++;
	540	continue;
	541	}
	542	err = multiblock_erase(i, j);
	543	if (err)
	544	goto out;
	545	cond_resched();
	546	i += j;
	547	}
	548	stop_timing();
	549	speed = calc_speed();
	550	printk(PRINT_PREF "%dx multi-block erase speed is %ld KiB/s\n",
	551	blocks, speed);
	552	}
72069be9 AB	553	printk(PRINT_PREF "finished\n");
	554	out:
	555	kfree(iobuf);
	556	kfree(bbt);
	557	put_mtd_device(mtd);
	558	if (err)
	559	printk(PRINT_PREF "error %d occurred\n", err);
	560	printk(KERN_INFO "=================================================\n");
	561	return err;
	562	}
	563	module_init(mtd_speedtest_init);
	564
	565	static void __exit mtd_speedtest_exit(void)
	566	{
	567	return;
	568	}
	569	module_exit(mtd_speedtest_exit);
	570
	571	MODULE_DESCRIPTION("Speed test module");
	572	MODULE_AUTHOR("Adrian Hunter");
	573	MODULE_LICENSE("GPL");