[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 <ext-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/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 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 = kmalloc(ebcnt, GFP_KERNEL);
	if (!bbt) {
		printk(PRINT_PREF "error: cannot allocate memory\n");
		return -ENOMEM;
	}
	memset(bbt, 0 , ebcnt);

	/* 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");
	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);

	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	*
	19	* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
	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>
	27	#include <linux/sched.h>
	28
	29	#define PRINT_PREF KERN_INFO "mtd_speedtest: "
	30
	31	static int dev;
	32	module_param(dev, int, S_IRUGO);
	33	MODULE_PARM_DESC(dev, "MTD device number to use");
	34
	35	static struct mtd_info *mtd;
	36	static unsigned char *iobuf;
	37	static unsigned char *bbt;
	38
	39	static int pgsize;
	40	static int ebcnt;
	41	static int pgcnt;
	42	static int goodebcnt;
	43	static struct timeval start, finish;
	44	static unsigned long next = 1;
	45
	46	static inline unsigned int simple_rand(void)
	47	{
	48	next = next * 1103515245 + 12345;
	49	return (unsigned int)((next / 65536) % 32768);
	50	}
	51
	52	static inline void simple_srand(unsigned long seed)
	53	{
	54	next = seed;
	55	}
	56
	57	static void set_random_data(unsigned char *buf, size_t len)
	58	{
	59	size_t i;
	60
	61	for (i = 0; i < len; ++i)
	62	buf[i] = simple_rand();
	63	}
	64
65	static int erase_eraseblock(int ebnum)
66	{
67	int err;
68	struct erase_info ei;
69	loff_t addr = ebnum * mtd->erasesize;
70
71	memset(&ei, 0, sizeof(struct erase_info));
72	ei.mtd = mtd;
73	ei.addr = addr;
74	ei.len = mtd->erasesize;
75
76	err = mtd->erase(mtd, &ei);
77	if (err) {
78	printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
79	return err;
80	}
81
82	if (ei.state == MTD_ERASE_FAILED) {
83	printk(PRINT_PREF "some erase error occurred at EB %d\n",
84	ebnum);
85	return -EIO;
86	}
87
88	return 0;
89	}
90
91	static int erase_whole_device(void)
92	{
93	int err;
94	unsigned int i;
95
96	for (i = 0; i < ebcnt; ++i) {
97	if (bbt[i])
98	continue;
99	err = erase_eraseblock(i);
100	if (err)
101	return err;
102	cond_resched();
103	}
104	return 0;
105	}
106
107	static int write_eraseblock(int ebnum)
108	{
109	size_t written = 0;
110	int err = 0;
111	loff_t addr = ebnum * mtd->erasesize;
112
113	err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
114	if (err \|\| written != mtd->erasesize) {
115	printk(PRINT_PREF "error: write failed at %#llx\n", addr);
116	if (!err)
117	err = -EINVAL;
118	}
119
120	return err;
121	}
122
123	static int write_eraseblock_by_page(int ebnum)
124	{
125	size_t written = 0;
126	int i, err = 0;
127	loff_t addr = ebnum * mtd->erasesize;
128	void *buf = iobuf;
129
130	for (i = 0; i < pgcnt; i++) {
131	err = mtd->write(mtd, addr, pgsize, &written, buf);
132	if (err \|\| written != pgsize) {
133	printk(PRINT_PREF "error: write failed at %#llx\n",
134	addr);
135	if (!err)
136	err = -EINVAL;
137	break;
138	}
139	addr += pgsize;
140	buf += pgsize;
141	}
142
143	return err;
144	}
145
146	static int write_eraseblock_by_2pages(int ebnum)
147	{
148	size_t written = 0, sz = pgsize * 2;
149	int i, n = pgcnt / 2, err = 0;
150	loff_t addr = ebnum * mtd->erasesize;
151	void *buf = iobuf;
152
153	for (i = 0; i < n; i++) {
154	err = mtd->write(mtd, addr, sz, &written, buf);
155	if (err \|\| written != sz) {
156	printk(PRINT_PREF "error: write failed at %#llx\n",
157	addr);
158	if (!err)
159	err = -EINVAL;
160	return err;
161	}
162	addr += sz;
163	buf += sz;
164	}
165	if (pgcnt % 2) {
166	err = mtd->write(mtd, addr, pgsize, &written, buf);
167	if (err \|\| written != pgsize) {
168	printk(PRINT_PREF "error: write failed at %#llx\n",
169	addr);
170	if (!err)
171	err = -EINVAL;
172	}
173	}
174
175	return err;
176	}
177
178	static int read_eraseblock(int ebnum)
179	{
180	size_t read = 0;
181	int err = 0;
182	loff_t addr = ebnum * mtd->erasesize;
183
184	err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
185	/* Ignore corrected ECC errors */
186	if (err == -EUCLEAN)
187	err = 0;
188	if (err \|\| read != mtd->erasesize) {
189	printk(PRINT_PREF "error: read failed at %#llx\n", addr);
190	if (!err)
191	err = -EINVAL;
192	}
193
194	return err;
195	}
196
197	static int read_eraseblock_by_page(int ebnum)
198	{
199	size_t read = 0;
200	int i, err = 0;
201	loff_t addr = ebnum * mtd->erasesize;
202	void *buf = iobuf;
203
204	for (i = 0; i < pgcnt; i++) {
205	err = mtd->read(mtd, addr, pgsize, &read, buf);
206	/* Ignore corrected ECC errors */
207	if (err == -EUCLEAN)
208	err = 0;
209	if (err \|\| read != pgsize) {
210	printk(PRINT_PREF "error: read failed at %#llx\n",
211	addr);
212	if (!err)
213	err = -EINVAL;
214	break;
215	}
216	addr += pgsize;
217	buf += pgsize;
218	}
219
220	return err;
221	}
222
223	static int read_eraseblock_by_2pages(int ebnum)
224	{
225	size_t read = 0, sz = pgsize * 2;
226	int i, n = pgcnt / 2, err = 0;
227	loff_t addr = ebnum * mtd->erasesize;
228	void *buf = iobuf;
229
230	for (i = 0; i < n; i++) {
231	err = mtd->read(mtd, addr, sz, &read, buf);
232	/* Ignore corrected ECC errors */
233	if (err == -EUCLEAN)
234	err = 0;
235	if (err \|\| read != sz) {
236	printk(PRINT_PREF "error: read failed at %#llx\n",
237	addr);
238	if (!err)
239	err = -EINVAL;
240	return err;
241	}
242	addr += sz;
243	buf += sz;
244	}
245	if (pgcnt % 2) {
246	err = mtd->read(mtd, addr, pgsize, &read, buf);
247	/* Ignore corrected ECC errors */
248	if (err == -EUCLEAN)
249	err = 0;
250	if (err \|\| read != pgsize) {
251	printk(PRINT_PREF "error: read failed at %#llx\n",
252	addr);
253	if (!err)
254	err = -EINVAL;
255	}
256	}
257
258	return err;
259	}
260
261	static int is_block_bad(int ebnum)
262	{
263	loff_t addr = ebnum * mtd->erasesize;
264	int ret;
265
266	ret = mtd->block_isbad(mtd, addr);
267	if (ret)
268	printk(PRINT_PREF "block %d is bad\n", ebnum);
269	return ret;
270	}
271
272	static inline void start_timing(void)
273	{
274	do_gettimeofday(&start);
275	}
276
277	static inline void stop_timing(void)
278	{
279	do_gettimeofday(&finish);
280	}
281
282	static long calc_speed(void)
283	{
284	long ms, k, speed;
285
286	ms = (finish.tv_sec - start.tv_sec) * 1000 +
287	(finish.tv_usec - start.tv_usec) / 1000;
288	k = goodebcnt * mtd->erasesize / 1024;
289	speed = (k * 1000) / ms;
290	return speed;
291	}
292
293	static int scan_for_bad_eraseblocks(void)
294	{
295	int i, bad = 0;
296
297	bbt = kmalloc(ebcnt, GFP_KERNEL);
298	if (!bbt) {
299	printk(PRINT_PREF "error: cannot allocate memory\n");
300	return -ENOMEM;
301	}
302	memset(bbt, 0 , ebcnt);
303
f5e2bae0 MTS	304	/* NOR flash does not implement block_isbad */
	305	if (mtd->block_isbad == NULL)
	306	goto out;
	307
72069be9 AB	308	printk(PRINT_PREF "scanning for bad eraseblocks\n");
	309	for (i = 0; i < ebcnt; ++i) {
	310	bbt[i] = is_block_bad(i) ? 1 : 0;
	311	if (bbt[i])
	312	bad += 1;
	313	cond_resched();
	314	}
	315	printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
f5e2bae0	316	out:
72069be9 AB	317	goodebcnt = ebcnt - bad;
	318	return 0;
	319	}
	320
	321	static int __init mtd_speedtest_init(void)
	322	{
	323	int err, i;
	324	long speed;
	325	uint64_t tmp;
	326
	327	printk(KERN_INFO "\n");
	328	printk(KERN_INFO "=================================================\n");
	329	printk(PRINT_PREF "MTD device: %d\n", dev);
	330
	331	mtd = get_mtd_device(NULL, dev);
	332	if (IS_ERR(mtd)) {
	333	err = PTR_ERR(mtd);
	334	printk(PRINT_PREF "error: cannot get MTD device\n");
	335	return err;
	336	}
	337
	338	if (mtd->writesize == 1) {
	339	printk(PRINT_PREF "not NAND flash, assume page size is 512 "
	340	"bytes.\n");
	341	pgsize = 512;
	342	} else
	343	pgsize = mtd->writesize;
	344
	345	tmp = mtd->size;
	346	do_div(tmp, mtd->erasesize);
	347	ebcnt = tmp;
f5e2bae0	348	pgcnt = mtd->erasesize / pgsize;
72069be9 AB	349
	350	printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
	351	"page size %u, count of eraseblocks %u, pages per "
	352	"eraseblock %u, OOB size %u\n",
	353	(unsigned long long)mtd->size, mtd->erasesize,
	354	pgsize, ebcnt, pgcnt, mtd->oobsize);
	355
	356	err = -ENOMEM;
	357	iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
	358	if (!iobuf) {
	359	printk(PRINT_PREF "error: cannot allocate memory\n");
	360	goto out;
	361	}
	362
	363	simple_srand(1);
	364	set_random_data(iobuf, mtd->erasesize);
	365
	366	err = scan_for_bad_eraseblocks();
	367	if (err)
	368	goto out;
	369
	370	err = erase_whole_device();
	371	if (err)
	372	goto out;
	373
	374	/* Write all eraseblocks, 1 eraseblock at a time */
	375	printk(PRINT_PREF "testing eraseblock write speed\n");
	376	start_timing();
	377	for (i = 0; i < ebcnt; ++i) {
	378	if (bbt[i])
	379	continue;
	380	err = write_eraseblock(i);
	381	if (err)
	382	goto out;
	383	cond_resched();
	384	}
	385	stop_timing();
	386	speed = calc_speed();
	387	printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
	388
	389	/* Read all eraseblocks, 1 eraseblock at a time */
	390	printk(PRINT_PREF "testing eraseblock read speed\n");
	391	start_timing();
	392	for (i = 0; i < ebcnt; ++i) {
	393	if (bbt[i])
	394	continue;
	395	err = read_eraseblock(i);
	396	if (err)
	397	goto out;
	398	cond_resched();
	399	}
	400	stop_timing();
	401	speed = calc_speed();
	402	printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
	403
	404	err = erase_whole_device();
	405	if (err)
	406	goto out;
	407
	408	/* Write all eraseblocks, 1 page at a time */
	409	printk(PRINT_PREF "testing page write speed\n");
	410	start_timing();
	411	for (i = 0; i < ebcnt; ++i) {
	412	if (bbt[i])
413	continue;
414	err = write_eraseblock_by_page(i);
415	if (err)
416	goto out;
417	cond_resched();
418	}
419	stop_timing();
420	speed = calc_speed();
421	printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
422
423	/* Read all eraseblocks, 1 page at a time */
424	printk(PRINT_PREF "testing page read speed\n");
425	start_timing();
426	for (i = 0; i < ebcnt; ++i) {
427	if (bbt[i])
428	continue;
429	err = read_eraseblock_by_page(i);
430	if (err)
431	goto out;
432	cond_resched();
433	}
434	stop_timing();
435	speed = calc_speed();
436	printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
437
438	err = erase_whole_device();
439	if (err)
440	goto out;
441
442	/* Write all eraseblocks, 2 pages at a time */
443	printk(PRINT_PREF "testing 2 page write speed\n");
444	start_timing();
445	for (i = 0; i < ebcnt; ++i) {
446	if (bbt[i])
447	continue;
448	err = write_eraseblock_by_2pages(i);
449	if (err)
450	goto out;
451	cond_resched();
452	}
453	stop_timing();
454	speed = calc_speed();
455	printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
456
457	/* Read all eraseblocks, 2 pages at a time */
458	printk(PRINT_PREF "testing 2 page read speed\n");
459	start_timing();
460	for (i = 0; i < ebcnt; ++i) {
461	if (bbt[i])
462	continue;
463	err = read_eraseblock_by_2pages(i);
464	if (err)
465	goto out;
466	cond_resched();
467	}
468	stop_timing();
469	speed = calc_speed();
470	printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
471
472	/* Erase all eraseblocks */
473	printk(PRINT_PREF "Testing erase speed\n");
474	start_timing();
475	for (i = 0; i < ebcnt; ++i) {
476	if (bbt[i])
477	continue;
478	err = erase_eraseblock(i);
479	if (err)
480	goto out;
481	cond_resched();
482	}
483	stop_timing();
484	speed = calc_speed();
485	printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
486
487	printk(PRINT_PREF "finished\n");
488	out:
489	kfree(iobuf);
490	kfree(bbt);
491	put_mtd_device(mtd);
492	if (err)
493	printk(PRINT_PREF "error %d occurred\n", err);
494	printk(KERN_INFO "=================================================\n");
495	return err;
496	}
497	module_init(mtd_speedtest_init);
498
499	static void __exit mtd_speedtest_exit(void)
500	{
501	return;
502	}
503	module_exit(mtd_speedtest_exit);
504
505	MODULE_DESCRIPTION("Speed test module");
506	MODULE_AUTHOR("Adrian Hunter");
507	MODULE_LICENSE("GPL");