[GitHub/mt8127/android_kernel_alcatel_ttab.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/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 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");
	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>
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
	36	static struct mtd_info *mtd;
	37	static unsigned char *iobuf;
	38	static unsigned char *bbt;
	39
	40	static int pgsize;
	41	static int ebcnt;
	42	static int pgcnt;
	43	static int goodebcnt;
	44	static struct timeval start, finish;
	45	static unsigned long next = 1;
	46
	47	static inline unsigned int simple_rand(void)
	48	{
	49	next = next * 1103515245 + 12345;
	50	return (unsigned int)((next / 65536) % 32768);
	51	}
	52
	53	static inline void simple_srand(unsigned long seed)
	54	{
	55	next = seed;
	56	}
	57
	58	static void set_random_data(unsigned char *buf, size_t len)
	59	{
	60	size_t i;
	61
	62	for (i = 0; i < len; ++i)
	63	buf[i] = simple_rand();
	64	}
	65
	66	static int erase_eraseblock(int ebnum)
	67	{
	68	int err;
	69	struct erase_info ei;
	70	loff_t addr = ebnum * mtd->erasesize;
	71
	72	memset(&ei, 0, sizeof(struct erase_info));
	73	ei.mtd = mtd;
	74	ei.addr = addr;
	75	ei.len = mtd->erasesize;
	76
	77	err = mtd->erase(mtd, &ei);
	78	if (err) {
	79	printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
	80	return err;
	81	}
	82
	83	if (ei.state == MTD_ERASE_FAILED) {
	84	printk(PRINT_PREF "some erase error occurred at EB %d\n",
	85	ebnum);
	86	return -EIO;
	87	}
	88
	89	return 0;
	90	}
	91
92	static int erase_whole_device(void)
93	{
94	int err;
95	unsigned int i;
96
97	for (i = 0; i < ebcnt; ++i) {
98	if (bbt[i])
99	continue;
100	err = erase_eraseblock(i);
101	if (err)
102	return err;
103	cond_resched();
104	}
105	return 0;
106	}
107
108	static int write_eraseblock(int ebnum)
109	{
110	size_t written = 0;
111	int err = 0;
112	loff_t addr = ebnum * mtd->erasesize;
113
114	err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
115	if (err \|\| written != mtd->erasesize) {
116	printk(PRINT_PREF "error: write failed at %#llx\n", addr);
117	if (!err)
118	err = -EINVAL;
119	}
120
121	return err;
122	}
123
124	static int write_eraseblock_by_page(int ebnum)
125	{
126	size_t written = 0;
127	int i, err = 0;
128	loff_t addr = ebnum * mtd->erasesize;
129	void *buf = iobuf;
130
131	for (i = 0; i < pgcnt; i++) {
132	err = mtd->write(mtd, addr, pgsize, &written, buf);
133	if (err \|\| written != pgsize) {
134	printk(PRINT_PREF "error: write failed at %#llx\n",
135	addr);
136	if (!err)
137	err = -EINVAL;
138	break;
139	}
140	addr += pgsize;
141	buf += pgsize;
142	}
143
144	return err;
145	}
146
147	static int write_eraseblock_by_2pages(int ebnum)
148	{
149	size_t written = 0, sz = pgsize * 2;
150	int i, n = pgcnt / 2, err = 0;
151	loff_t addr = ebnum * mtd->erasesize;
152	void *buf = iobuf;
153
154	for (i = 0; i < n; i++) {
155	err = mtd->write(mtd, addr, sz, &written, buf);
156	if (err \|\| written != sz) {
157	printk(PRINT_PREF "error: write failed at %#llx\n",
158	addr);
159	if (!err)
160	err = -EINVAL;
161	return err;
162	}
163	addr += sz;
164	buf += sz;
165	}
166	if (pgcnt % 2) {
167	err = mtd->write(mtd, addr, pgsize, &written, buf);
168	if (err \|\| written != pgsize) {
169	printk(PRINT_PREF "error: write failed at %#llx\n",
170	addr);
171	if (!err)
172	err = -EINVAL;
173	}
174	}
175
176	return err;
177	}
178
179	static int read_eraseblock(int ebnum)
180	{
181	size_t read = 0;
182	int err = 0;
183	loff_t addr = ebnum * mtd->erasesize;
184
185	err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
186	/* Ignore corrected ECC errors */
187	if (err == -EUCLEAN)
188	err = 0;
189	if (err \|\| read != mtd->erasesize) {
190	printk(PRINT_PREF "error: read failed at %#llx\n", addr);
191	if (!err)
192	err = -EINVAL;
193	}
194
195	return err;
196	}
197
198	static int read_eraseblock_by_page(int ebnum)
199	{
200	size_t read = 0;
201	int i, err = 0;
202	loff_t addr = ebnum * mtd->erasesize;
203	void *buf = iobuf;
204
205	for (i = 0; i < pgcnt; i++) {
206	err = mtd->read(mtd, addr, pgsize, &read, buf);
207	/* Ignore corrected ECC errors */
208	if (err == -EUCLEAN)
209	err = 0;
210	if (err \|\| read != pgsize) {
211	printk(PRINT_PREF "error: read failed at %#llx\n",
212	addr);
213	if (!err)
214	err = -EINVAL;
215	break;
216	}
217	addr += pgsize;
218	buf += pgsize;
219	}
220
221	return err;
222	}
223
224	static int read_eraseblock_by_2pages(int ebnum)
225	{
226	size_t read = 0, sz = pgsize * 2;
227	int i, n = pgcnt / 2, err = 0;
228	loff_t addr = ebnum * mtd->erasesize;
229	void *buf = iobuf;
230
231	for (i = 0; i < n; i++) {
232	err = mtd->read(mtd, addr, sz, &read, buf);
233	/* Ignore corrected ECC errors */
234	if (err == -EUCLEAN)
235	err = 0;
236	if (err \|\| read != sz) {
237	printk(PRINT_PREF "error: read failed at %#llx\n",
238	addr);
239	if (!err)
240	err = -EINVAL;
241	return err;
242	}
243	addr += sz;
244	buf += sz;
245	}
246	if (pgcnt % 2) {
247	err = mtd->read(mtd, addr, pgsize, &read, buf);
248	/* Ignore corrected ECC errors */
249	if (err == -EUCLEAN)
250	err = 0;
251	if (err \|\| read != pgsize) {
252	printk(PRINT_PREF "error: read failed at %#llx\n",
253	addr);
254	if (!err)
255	err = -EINVAL;
256	}
257	}
258
259	return err;
260	}
261
262	static int is_block_bad(int ebnum)
263	{
264	loff_t addr = ebnum * mtd->erasesize;
265	int ret;
266
267	ret = mtd->block_isbad(mtd, addr);
268	if (ret)
269	printk(PRINT_PREF "block %d is bad\n", ebnum);
270	return ret;
271	}
272
273	static inline void start_timing(void)
274	{
275	do_gettimeofday(&start);
276	}
277
278	static inline void stop_timing(void)
279	{
280	do_gettimeofday(&finish);
281	}
282
283	static long calc_speed(void)
284	{
285	long ms, k, speed;
286
287	ms = (finish.tv_sec - start.tv_sec) * 1000 +
288	(finish.tv_usec - start.tv_usec) / 1000;
289	k = goodebcnt * mtd->erasesize / 1024;
290	speed = (k * 1000) / ms;
291	return speed;
292	}
293
294	static int scan_for_bad_eraseblocks(void)
295	{
296	int i, bad = 0;
297
2bfefa4c	298	bbt = kzalloc(ebcnt, GFP_KERNEL);
72069be9 AB	299	if (!bbt) {
	300	printk(PRINT_PREF "error: cannot allocate memory\n");
	301	return -ENOMEM;
	302	}
72069be9	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");