[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 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 = 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;
	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);

	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
	97	static int erase_whole_device(void)
	98	{
	99	int err;
	100	unsigned int i;
	101
	102	for (i = 0; i < ebcnt; ++i) {
	103	if (bbt[i])
	104	continue;
105	err = erase_eraseblock(i);
106	if (err)
107	return err;
108	cond_resched();
109	}
110	return 0;
111	}
112
113	static int write_eraseblock(int ebnum)
114	{
115	size_t written = 0;
116	int err = 0;
117	loff_t addr = ebnum * mtd->erasesize;
118
119	err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
120	if (err \|\| written != mtd->erasesize) {
121	printk(PRINT_PREF "error: write failed at %#llx\n", addr);
122	if (!err)
123	err = -EINVAL;
124	}
125
126	return err;
127	}
128
129	static int write_eraseblock_by_page(int ebnum)
130	{
131	size_t written = 0;
132	int i, err = 0;
133	loff_t addr = ebnum * mtd->erasesize;
134	void *buf = iobuf;
135
136	for (i = 0; i < pgcnt; i++) {
137	err = mtd->write(mtd, addr, pgsize, &written, buf);
138	if (err \|\| written != pgsize) {
139	printk(PRINT_PREF "error: write failed at %#llx\n",
140	addr);
141	if (!err)
142	err = -EINVAL;
143	break;
144	}
145	addr += pgsize;
146	buf += pgsize;
147	}
148
149	return err;
150	}
151
152	static int write_eraseblock_by_2pages(int ebnum)
153	{
154	size_t written = 0, sz = pgsize * 2;
155	int i, n = pgcnt / 2, err = 0;
156	loff_t addr = ebnum * mtd->erasesize;
157	void *buf = iobuf;
158
159	for (i = 0; i < n; i++) {
160	err = mtd->write(mtd, addr, sz, &written, buf);
161	if (err \|\| written != sz) {
162	printk(PRINT_PREF "error: write failed at %#llx\n",
163	addr);
164	if (!err)
165	err = -EINVAL;
166	return err;
167	}
168	addr += sz;
169	buf += sz;
170	}
171	if (pgcnt % 2) {
172	err = mtd->write(mtd, addr, pgsize, &written, buf);
173	if (err \|\| written != pgsize) {
174	printk(PRINT_PREF "error: write failed at %#llx\n",
175	addr);
176	if (!err)
177	err = -EINVAL;
178	}
179	}
180
181	return err;
182	}
183
184	static int read_eraseblock(int ebnum)
185	{
186	size_t read = 0;
187	int err = 0;
188	loff_t addr = ebnum * mtd->erasesize;
189
190	err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
191	/* Ignore corrected ECC errors */
192	if (err == -EUCLEAN)
193	err = 0;
194	if (err \|\| read != mtd->erasesize) {
195	printk(PRINT_PREF "error: read failed at %#llx\n", addr);
196	if (!err)
197	err = -EINVAL;
198	}
199
200	return err;
201	}
202
203	static int read_eraseblock_by_page(int ebnum)
204	{
205	size_t read = 0;
206	int i, err = 0;
207	loff_t addr = ebnum * mtd->erasesize;
208	void *buf = iobuf;
209
210	for (i = 0; i < pgcnt; i++) {
211	err = mtd->read(mtd, addr, pgsize, &read, buf);
212	/* Ignore corrected ECC errors */
213	if (err == -EUCLEAN)
214	err = 0;
215	if (err \|\| read != pgsize) {
216	printk(PRINT_PREF "error: read failed at %#llx\n",
217	addr);
218	if (!err)
219	err = -EINVAL;
220	break;
221	}
222	addr += pgsize;
223	buf += pgsize;
224	}
225
226	return err;
227	}
228
229	static int read_eraseblock_by_2pages(int ebnum)
230	{
231	size_t read = 0, sz = pgsize * 2;
232	int i, n = pgcnt / 2, err = 0;
233	loff_t addr = ebnum * mtd->erasesize;
234	void *buf = iobuf;
235
236	for (i = 0; i < n; i++) {
237	err = mtd->read(mtd, addr, sz, &read, buf);
238	/* Ignore corrected ECC errors */
239	if (err == -EUCLEAN)
240	err = 0;
241	if (err \|\| read != sz) {
242	printk(PRINT_PREF "error: read failed at %#llx\n",
243	addr);
244	if (!err)
245	err = -EINVAL;
246	return err;
247	}
248	addr += sz;
249	buf += sz;
250	}
251	if (pgcnt % 2) {
252	err = mtd->read(mtd, addr, pgsize, &read, buf);
253	/* Ignore corrected ECC errors */
254	if (err == -EUCLEAN)
255	err = 0;
256	if (err \|\| read != pgsize) {
257	printk(PRINT_PREF "error: read failed at %#llx\n",
258	addr);
259	if (!err)
260	err = -EINVAL;
261	}
262	}
263
264	return err;
265	}
266
267	static int is_block_bad(int ebnum)
268	{
269	loff_t addr = ebnum * mtd->erasesize;
270	int ret;
271
272	ret = mtd->block_isbad(mtd, addr);
273	if (ret)
274	printk(PRINT_PREF "block %d is bad\n", ebnum);
275	return ret;
276	}
277
278	static inline void start_timing(void)
279	{
280	do_gettimeofday(&start);
281	}
282
283	static inline void stop_timing(void)
284	{
285	do_gettimeofday(&finish);
286	}
287
288	static long calc_speed(void)
289	{
290	long ms, k, speed;
291
292	ms = (finish.tv_sec - start.tv_sec) * 1000 +
293	(finish.tv_usec - start.tv_usec) / 1000;
294	k = goodebcnt * mtd->erasesize / 1024;
295	speed = (k * 1000) / ms;
296	return speed;
297	}
298
299	static int scan_for_bad_eraseblocks(void)
300	{
301	int i, bad = 0;
302
2bfefa4c	303	bbt = kzalloc(ebcnt, GFP_KERNEL);
72069be9 AB	304	if (!bbt) {
	305	printk(PRINT_PREF "error: cannot allocate memory\n");
	306	return -ENOMEM;
	307	}
72069be9	308
f5e2bae0 MTS	309	/* NOR flash does not implement block_isbad */
	310	if (mtd->block_isbad == NULL)
	311	goto out;
	312
72069be9 AB	313	printk(PRINT_PREF "scanning for bad eraseblocks\n");
	314	for (i = 0; i < ebcnt; ++i) {
	315	bbt[i] = is_block_bad(i) ? 1 : 0;
	316	if (bbt[i])
	317	bad += 1;
	318	cond_resched();
	319	}
	320	printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
f5e2bae0	321	out:
72069be9 AB	322	goodebcnt = ebcnt - bad;
	323	return 0;
	324	}
	325
	326	static int __init mtd_speedtest_init(void)
	327	{
	328	int err, i;
	329	long speed;
	330	uint64_t tmp;
	331
	332	printk(KERN_INFO "\n");
	333	printk(KERN_INFO "=================================================\n");
fc7fe769 AH	334	if (count)
	335	printk(PRINT_PREF "MTD device: %d count: %d\n", dev, count);
	336	else
	337	printk(PRINT_PREF "MTD device: %d\n", dev);
72069be9 AB	338
	339	mtd = get_mtd_device(NULL, dev);
	340	if (IS_ERR(mtd)) {
	341	err = PTR_ERR(mtd);
	342	printk(PRINT_PREF "error: cannot get MTD device\n");
	343	return err;
	344	}
	345
	346	if (mtd->writesize == 1) {
	347	printk(PRINT_PREF "not NAND flash, assume page size is 512 "
	348	"bytes.\n");
	349	pgsize = 512;
	350	} else
	351	pgsize = mtd->writesize;
	352
	353	tmp = mtd->size;
	354	do_div(tmp, mtd->erasesize);
	355	ebcnt = tmp;
f5e2bae0	356	pgcnt = mtd->erasesize / pgsize;
72069be9 AB	357
	358	printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
	359	"page size %u, count of eraseblocks %u, pages per "
	360	"eraseblock %u, OOB size %u\n",
	361	(unsigned long long)mtd->size, mtd->erasesize,
	362	pgsize, ebcnt, pgcnt, mtd->oobsize);
	363
fc7fe769 AH	364	if (count > 0 && count < ebcnt)
	365	ebcnt = count;
	366
72069be9 AB	367	err = -ENOMEM;
	368	iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
	369	if (!iobuf) {
	370	printk(PRINT_PREF "error: cannot allocate memory\n");
	371	goto out;
	372	}
	373
	374	simple_srand(1);
	375	set_random_data(iobuf, mtd->erasesize);
	376
	377	err = scan_for_bad_eraseblocks();
	378	if (err)
	379	goto out;
	380
	381	err = erase_whole_device();
	382	if (err)
	383	goto out;
	384
	385	/* Write all eraseblocks, 1 eraseblock at a time */
	386	printk(PRINT_PREF "testing eraseblock write speed\n");
	387	start_timing();
	388	for (i = 0; i < ebcnt; ++i) {
	389	if (bbt[i])
	390	continue;
	391	err = write_eraseblock(i);
	392	if (err)
	393	goto out;
	394	cond_resched();
	395	}
	396	stop_timing();
	397	speed = calc_speed();
	398	printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
	399
	400	/* Read all eraseblocks, 1 eraseblock at a time */
	401	printk(PRINT_PREF "testing eraseblock read speed\n");
	402	start_timing();
	403	for (i = 0; i < ebcnt; ++i) {
	404	if (bbt[i])
	405	continue;
	406	err = read_eraseblock(i);
	407	if (err)
	408	goto out;
	409	cond_resched();
	410	}
	411	stop_timing();
	412	speed = calc_speed();
	413	printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
	414
	415	err = erase_whole_device();
	416	if (err)
	417	goto out;
	418
	419	/* Write all eraseblocks, 1 page at a time */
	420	printk(PRINT_PREF "testing page write speed\n");
	421	start_timing();
	422	for (i = 0; i < ebcnt; ++i) {
	423	if (bbt[i])
	424	continue;
	425	err = write_eraseblock_by_page(i);
	426	if (err)
	427	goto out;
	428	cond_resched();
	429	}
	430	stop_timing();
431	speed = calc_speed();
432	printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
433
434	/* Read all eraseblocks, 1 page at a time */
435	printk(PRINT_PREF "testing page read speed\n");
436	start_timing();
437	for (i = 0; i < ebcnt; ++i) {
438	if (bbt[i])
439	continue;
440	err = read_eraseblock_by_page(i);
441	if (err)
442	goto out;
443	cond_resched();
444	}
445	stop_timing();
446	speed = calc_speed();
447	printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
448
449	err = erase_whole_device();
450	if (err)
451	goto out;
452
453	/* Write all eraseblocks, 2 pages at a time */
454	printk(PRINT_PREF "testing 2 page write speed\n");
455	start_timing();
456	for (i = 0; i < ebcnt; ++i) {
457	if (bbt[i])
458	continue;
459	err = write_eraseblock_by_2pages(i);
460	if (err)
461	goto out;
462	cond_resched();
463	}
464	stop_timing();
465	speed = calc_speed();
466	printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
467
468	/* Read all eraseblocks, 2 pages at a time */
469	printk(PRINT_PREF "testing 2 page read speed\n");
470	start_timing();
471	for (i = 0; i < ebcnt; ++i) {
472	if (bbt[i])
473	continue;
474	err = read_eraseblock_by_2pages(i);
475	if (err)
476	goto out;
477	cond_resched();
478	}
479	stop_timing();
480	speed = calc_speed();
481	printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
482
483	/* Erase all eraseblocks */
484	printk(PRINT_PREF "Testing erase speed\n");
485	start_timing();
486	for (i = 0; i < ebcnt; ++i) {
487	if (bbt[i])
488	continue;
489	err = erase_eraseblock(i);
490	if (err)
491	goto out;
492	cond_resched();
493	}
494	stop_timing();
495	speed = calc_speed();
496	printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
497
498	printk(PRINT_PREF "finished\n");
499	out:
500	kfree(iobuf);
501	kfree(bbt);
502	put_mtd_device(mtd);
503	if (err)
504	printk(PRINT_PREF "error %d occurred\n", err);
505	printk(KERN_INFO "=================================================\n");
506	return err;
507	}
508	module_init(mtd_speedtest_init);
509
510	static void __exit mtd_speedtest_exit(void)
511	{
512	return;
513	}
514	module_exit(mtd_speedtest_exit);
515
516	MODULE_DESCRIPTION("Speed test module");
517	MODULE_AUTHOR("Adrian Hunter");
518	MODULE_LICENSE("GPL");