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 <ext-adrian.hunter@nokia.com>
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/slab.h>
28 #include <linux/sched.h>
30 #define PRINT_PREF KERN_INFO "mtd_speedtest: "
33 module_param(dev, int, S_IRUGO);
34 MODULE_PARM_DESC(dev, "MTD device number to use");
36 static struct mtd_info *mtd;
37 static unsigned char *iobuf;
38 static unsigned char *bbt;
44 static struct timeval start, finish;
45 static unsigned long next = 1;
47 static inline unsigned int simple_rand(void)
49 next = next * 1103515245 + 12345;
50 return (unsigned int)((next / 65536) % 32768);
53 static inline void simple_srand(unsigned long seed)
58 static void set_random_data(unsigned char *buf, size_t len)
62 for (i = 0; i < len; ++i)
63 buf[i] = simple_rand();
66 static int erase_eraseblock(int ebnum)
70 loff_t addr = ebnum * mtd->erasesize;
72 memset(&ei, 0, sizeof(struct erase_info));
75 ei.len = mtd->erasesize;
77 err = mtd->erase(mtd, &ei);
79 printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
83 if (ei.state == MTD_ERASE_FAILED) {
84 printk(PRINT_PREF "some erase error occurred at EB %d\n",
92 static int erase_whole_device(void)
97 for (i = 0; i < ebcnt; ++i) {
100 err = erase_eraseblock(i);
108 static int write_eraseblock(int ebnum)
112 loff_t addr = ebnum * mtd->erasesize;
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);
124 static int write_eraseblock_by_page(int ebnum)
128 loff_t addr = ebnum * mtd->erasesize;
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",
147 static int write_eraseblock_by_2pages(int ebnum)
149 size_t written = 0, sz = pgsize * 2;
150 int i, n = pgcnt / 2, err = 0;
151 loff_t addr = ebnum * mtd->erasesize;
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",
167 err = mtd->write(mtd, addr, pgsize, &written, buf);
168 if (err || written != pgsize) {
169 printk(PRINT_PREF "error: write failed at %#llx\n",
179 static int read_eraseblock(int ebnum)
183 loff_t addr = ebnum * mtd->erasesize;
185 err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
186 /* Ignore corrected ECC errors */
189 if (err || read != mtd->erasesize) {
190 printk(PRINT_PREF "error: read failed at %#llx\n", addr);
198 static int read_eraseblock_by_page(int ebnum)
202 loff_t addr = ebnum * mtd->erasesize;
205 for (i = 0; i < pgcnt; i++) {
206 err = mtd->read(mtd, addr, pgsize, &read, buf);
207 /* Ignore corrected ECC errors */
210 if (err || read != pgsize) {
211 printk(PRINT_PREF "error: read failed at %#llx\n",
224 static int read_eraseblock_by_2pages(int ebnum)
226 size_t read = 0, sz = pgsize * 2;
227 int i, n = pgcnt / 2, err = 0;
228 loff_t addr = ebnum * mtd->erasesize;
231 for (i = 0; i < n; i++) {
232 err = mtd->read(mtd, addr, sz, &read, buf);
233 /* Ignore corrected ECC errors */
236 if (err || read != sz) {
237 printk(PRINT_PREF "error: read failed at %#llx\n",
247 err = mtd->read(mtd, addr, pgsize, &read, buf);
248 /* Ignore corrected ECC errors */
251 if (err || read != pgsize) {
252 printk(PRINT_PREF "error: read failed at %#llx\n",
262 static int is_block_bad(int ebnum)
264 loff_t addr = ebnum * mtd->erasesize;
267 ret = mtd->block_isbad(mtd, addr);
269 printk(PRINT_PREF "block %d is bad\n", ebnum);
273 static inline void start_timing(void)
275 do_gettimeofday(&start);
278 static inline void stop_timing(void)
280 do_gettimeofday(&finish);
283 static long calc_speed(void)
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;
294 static int scan_for_bad_eraseblocks(void)
298 bbt = kmalloc(ebcnt, GFP_KERNEL);
300 printk(PRINT_PREF "error: cannot allocate memory\n");
303 memset(bbt, 0 , ebcnt);
305 /* NOR flash does not implement block_isbad */
306 if (mtd->block_isbad == NULL)
309 printk(PRINT_PREF "scanning for bad eraseblocks\n");
310 for (i = 0; i < ebcnt; ++i) {
311 bbt[i] = is_block_bad(i) ? 1 : 0;
316 printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
318 goodebcnt = ebcnt - bad;
322 static int __init mtd_speedtest_init(void)
328 printk(KERN_INFO "\n");
329 printk(KERN_INFO "=================================================\n");
330 printk(PRINT_PREF "MTD device: %d\n", dev);
332 mtd = get_mtd_device(NULL, dev);
335 printk(PRINT_PREF "error: cannot get MTD device\n");
339 if (mtd->writesize == 1) {
340 printk(PRINT_PREF "not NAND flash, assume page size is 512 "
344 pgsize = mtd->writesize;
347 do_div(tmp, mtd->erasesize);
349 pgcnt = mtd->erasesize / pgsize;
351 printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
352 "page size %u, count of eraseblocks %u, pages per "
353 "eraseblock %u, OOB size %u\n",
354 (unsigned long long)mtd->size, mtd->erasesize,
355 pgsize, ebcnt, pgcnt, mtd->oobsize);
358 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
360 printk(PRINT_PREF "error: cannot allocate memory\n");
365 set_random_data(iobuf, mtd->erasesize);
367 err = scan_for_bad_eraseblocks();
371 err = erase_whole_device();
375 /* Write all eraseblocks, 1 eraseblock at a time */
376 printk(PRINT_PREF "testing eraseblock write speed\n");
378 for (i = 0; i < ebcnt; ++i) {
381 err = write_eraseblock(i);
387 speed = calc_speed();
388 printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
390 /* Read all eraseblocks, 1 eraseblock at a time */
391 printk(PRINT_PREF "testing eraseblock read speed\n");
393 for (i = 0; i < ebcnt; ++i) {
396 err = read_eraseblock(i);
402 speed = calc_speed();
403 printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
405 err = erase_whole_device();
409 /* Write all eraseblocks, 1 page at a time */
410 printk(PRINT_PREF "testing page write speed\n");
412 for (i = 0; i < ebcnt; ++i) {
415 err = write_eraseblock_by_page(i);
421 speed = calc_speed();
422 printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
424 /* Read all eraseblocks, 1 page at a time */
425 printk(PRINT_PREF "testing page read speed\n");
427 for (i = 0; i < ebcnt; ++i) {
430 err = read_eraseblock_by_page(i);
436 speed = calc_speed();
437 printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
439 err = erase_whole_device();
443 /* Write all eraseblocks, 2 pages at a time */
444 printk(PRINT_PREF "testing 2 page write speed\n");
446 for (i = 0; i < ebcnt; ++i) {
449 err = write_eraseblock_by_2pages(i);
455 speed = calc_speed();
456 printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
458 /* Read all eraseblocks, 2 pages at a time */
459 printk(PRINT_PREF "testing 2 page read speed\n");
461 for (i = 0; i < ebcnt; ++i) {
464 err = read_eraseblock_by_2pages(i);
470 speed = calc_speed();
471 printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
473 /* Erase all eraseblocks */
474 printk(PRINT_PREF "Testing erase speed\n");
476 for (i = 0; i < ebcnt; ++i) {
479 err = erase_eraseblock(i);
485 speed = calc_speed();
486 printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
488 printk(PRINT_PREF "finished\n");
494 printk(PRINT_PREF "error %d occurred\n", err);
495 printk(KERN_INFO "=================================================\n");
498 module_init(mtd_speedtest_init);
500 static void __exit mtd_speedtest_exit(void)
504 module_exit(mtd_speedtest_exit);
506 MODULE_DESCRIPTION("Speed test module");
507 MODULE_AUTHOR("Adrian Hunter");
508 MODULE_LICENSE("GPL");