2 * Copyright (C) 2007 Nokia Corporation
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.
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
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.
17 * Test read and write speed of a MTD device.
19 * Author: Adrian Hunter <adrian.hunter@nokia.com>
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/err.h>
28 #include <linux/mtd/mtd.h>
29 #include <linux/slab.h>
30 #include <linux/sched.h>
31 #include <linux/random.h>
33 static int dev = -EINVAL;
34 module_param(dev, int, S_IRUGO);
35 MODULE_PARM_DESC(dev, "MTD device number to use");
38 module_param(count, int, S_IRUGO);
39 MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
42 static struct mtd_info *mtd;
43 static unsigned char *iobuf;
44 static unsigned char *bbt;
50 static struct timeval start, finish;
53 static int erase_eraseblock(int ebnum)
57 loff_t addr = ebnum * mtd->erasesize;
59 memset(&ei, 0, sizeof(struct erase_info));
62 ei.len = mtd->erasesize;
64 err = mtd_erase(mtd, &ei);
66 pr_err("error %d while erasing EB %d\n", err, ebnum);
70 if (ei.state == MTD_ERASE_FAILED) {
71 pr_err("some erase error occurred at EB %d\n",
79 static int multiblock_erase(int ebnum, int blocks)
83 loff_t addr = ebnum * mtd->erasesize;
85 memset(&ei, 0, sizeof(struct erase_info));
88 ei.len = mtd->erasesize * blocks;
90 err = mtd_erase(mtd, &ei);
92 pr_err("error %d while erasing EB %d, blocks %d\n",
97 if (ei.state == MTD_ERASE_FAILED) {
98 pr_err("some erase error occurred at EB %d,"
99 "blocks %d\n", ebnum, blocks);
106 static int erase_whole_device(void)
111 for (i = 0; i < ebcnt; ++i) {
114 err = erase_eraseblock(i);
122 static int write_eraseblock(int ebnum)
126 loff_t addr = ebnum * mtd->erasesize;
128 err = mtd_write(mtd, addr, mtd->erasesize, &written, iobuf);
129 if (err || written != mtd->erasesize) {
130 pr_err("error: write failed at %#llx\n", addr);
138 static int write_eraseblock_by_page(int ebnum)
142 loff_t addr = ebnum * mtd->erasesize;
145 for (i = 0; i < pgcnt; i++) {
146 err = mtd_write(mtd, addr, pgsize, &written, buf);
147 if (err || written != pgsize) {
148 pr_err("error: write failed at %#llx\n",
161 static int write_eraseblock_by_2pages(int ebnum)
163 size_t written, sz = pgsize * 2;
164 int i, n = pgcnt / 2, err = 0;
165 loff_t addr = ebnum * mtd->erasesize;
168 for (i = 0; i < n; i++) {
169 err = mtd_write(mtd, addr, sz, &written, buf);
170 if (err || written != sz) {
171 pr_err("error: write failed at %#llx\n",
181 err = mtd_write(mtd, addr, pgsize, &written, buf);
182 if (err || written != pgsize) {
183 pr_err("error: write failed at %#llx\n",
193 static int read_eraseblock(int ebnum)
197 loff_t addr = ebnum * mtd->erasesize;
199 err = mtd_read(mtd, addr, mtd->erasesize, &read, iobuf);
200 /* Ignore corrected ECC errors */
201 if (mtd_is_bitflip(err))
203 if (err || read != mtd->erasesize) {
204 pr_err("error: read failed at %#llx\n", addr);
212 static int read_eraseblock_by_page(int ebnum)
216 loff_t addr = ebnum * mtd->erasesize;
219 for (i = 0; i < pgcnt; i++) {
220 err = mtd_read(mtd, addr, pgsize, &read, buf);
221 /* Ignore corrected ECC errors */
222 if (mtd_is_bitflip(err))
224 if (err || read != pgsize) {
225 pr_err("error: read failed at %#llx\n",
238 static int read_eraseblock_by_2pages(int ebnum)
240 size_t read, sz = pgsize * 2;
241 int i, n = pgcnt / 2, err = 0;
242 loff_t addr = ebnum * mtd->erasesize;
245 for (i = 0; i < n; i++) {
246 err = mtd_read(mtd, addr, sz, &read, buf);
247 /* Ignore corrected ECC errors */
248 if (mtd_is_bitflip(err))
250 if (err || read != sz) {
251 pr_err("error: read failed at %#llx\n",
261 err = mtd_read(mtd, addr, pgsize, &read, buf);
262 /* Ignore corrected ECC errors */
263 if (mtd_is_bitflip(err))
265 if (err || read != pgsize) {
266 pr_err("error: read failed at %#llx\n",
276 static int is_block_bad(int ebnum)
278 loff_t addr = ebnum * mtd->erasesize;
281 ret = mtd_block_isbad(mtd, addr);
283 pr_info("block %d is bad\n", ebnum);
287 static inline void start_timing(void)
289 do_gettimeofday(&start);
292 static inline void stop_timing(void)
294 do_gettimeofday(&finish);
297 static long calc_speed(void)
302 ms = (finish.tv_sec - start.tv_sec) * 1000 +
303 (finish.tv_usec - start.tv_usec) / 1000;
306 k = goodebcnt * (mtd->erasesize / 1024) * 1000;
311 static int scan_for_bad_eraseblocks(void)
315 bbt = kzalloc(ebcnt, GFP_KERNEL);
319 if (!mtd_can_have_bb(mtd))
322 pr_info("scanning for bad eraseblocks\n");
323 for (i = 0; i < ebcnt; ++i) {
324 bbt[i] = is_block_bad(i) ? 1 : 0;
329 pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
331 goodebcnt = ebcnt - bad;
335 static int __init mtd_speedtest_init(void)
337 int err, i, blocks, j, k;
341 printk(KERN_INFO "\n");
342 printk(KERN_INFO "=================================================\n");
345 pr_info("Please specify a valid mtd-device via module parameter\n");
346 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
351 pr_info("MTD device: %d count: %d\n", dev, count);
353 pr_info("MTD device: %d\n", dev);
355 mtd = get_mtd_device(NULL, dev);
358 pr_err("error: cannot get MTD device\n");
362 if (mtd->writesize == 1) {
363 pr_info("not NAND flash, assume page size is 512 "
367 pgsize = mtd->writesize;
370 do_div(tmp, mtd->erasesize);
372 pgcnt = mtd->erasesize / pgsize;
374 pr_info("MTD device size %llu, eraseblock size %u, "
375 "page size %u, count of eraseblocks %u, pages per "
376 "eraseblock %u, OOB size %u\n",
377 (unsigned long long)mtd->size, mtd->erasesize,
378 pgsize, ebcnt, pgcnt, mtd->oobsize);
380 if (count > 0 && count < ebcnt)
384 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
388 prandom_bytes(iobuf, mtd->erasesize);
390 err = scan_for_bad_eraseblocks();
394 err = erase_whole_device();
398 /* Write all eraseblocks, 1 eraseblock at a time */
399 pr_info("testing eraseblock write speed\n");
401 for (i = 0; i < ebcnt; ++i) {
404 err = write_eraseblock(i);
410 speed = calc_speed();
411 pr_info("eraseblock write speed is %ld KiB/s\n", speed);
413 /* Read all eraseblocks, 1 eraseblock at a time */
414 pr_info("testing eraseblock read speed\n");
416 for (i = 0; i < ebcnt; ++i) {
419 err = read_eraseblock(i);
425 speed = calc_speed();
426 pr_info("eraseblock read speed is %ld KiB/s\n", speed);
428 err = erase_whole_device();
432 /* Write all eraseblocks, 1 page at a time */
433 pr_info("testing page write speed\n");
435 for (i = 0; i < ebcnt; ++i) {
438 err = write_eraseblock_by_page(i);
444 speed = calc_speed();
445 pr_info("page write speed is %ld KiB/s\n", speed);
447 /* Read all eraseblocks, 1 page at a time */
448 pr_info("testing page read speed\n");
450 for (i = 0; i < ebcnt; ++i) {
453 err = read_eraseblock_by_page(i);
459 speed = calc_speed();
460 pr_info("page read speed is %ld KiB/s\n", speed);
462 err = erase_whole_device();
466 /* Write all eraseblocks, 2 pages at a time */
467 pr_info("testing 2 page write speed\n");
469 for (i = 0; i < ebcnt; ++i) {
472 err = write_eraseblock_by_2pages(i);
478 speed = calc_speed();
479 pr_info("2 page write speed is %ld KiB/s\n", speed);
481 /* Read all eraseblocks, 2 pages at a time */
482 pr_info("testing 2 page read speed\n");
484 for (i = 0; i < ebcnt; ++i) {
487 err = read_eraseblock_by_2pages(i);
493 speed = calc_speed();
494 pr_info("2 page read speed is %ld KiB/s\n", speed);
496 /* Erase all eraseblocks */
497 pr_info("Testing erase speed\n");
499 for (i = 0; i < ebcnt; ++i) {
502 err = erase_eraseblock(i);
508 speed = calc_speed();
509 pr_info("erase speed is %ld KiB/s\n", speed);
511 /* Multi-block erase all eraseblocks */
512 for (k = 1; k < 7; k++) {
514 pr_info("Testing %dx multi-block erase speed\n",
517 for (i = 0; i < ebcnt; ) {
518 for (j = 0; j < blocks && (i + j) < ebcnt; j++)
525 err = multiblock_erase(i, j);
532 speed = calc_speed();
533 pr_info("%dx multi-block erase speed is %ld KiB/s\n",
536 pr_info("finished\n");
542 pr_info("error %d occurred\n", err);
543 printk(KERN_INFO "=================================================\n");
546 module_init(mtd_speedtest_init);
548 static void __exit mtd_speedtest_exit(void)
552 module_exit(mtd_speedtest_exit);
554 MODULE_DESCRIPTION("Speed test module");
555 MODULE_AUTHOR("Adrian Hunter");
556 MODULE_LICENSE("GPL");