tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <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/slab.h>
28#include <linux/sched.h>
29
30#define PRINT_PREF KERN_INFO "mtd_speedtest: "
31
32static int dev = -EINVAL;
33module_param(dev, int, S_IRUGO);
34MODULE_PARM_DESC(dev, "MTD device number to use");
35
36static int count;
37module_param(count, int, S_IRUGO);
38MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
39 "(0 means use all)");
40
41static struct mtd_info *mtd;
42static unsigned char *iobuf;
43static unsigned char *bbt;
44
45static int pgsize;
46static int ebcnt;
47static int pgcnt;
48static int goodebcnt;
49static struct timeval start, finish;
50static unsigned long next = 1;
51
52static inline unsigned int simple_rand(void)
53{
54 next = next * 1103515245 + 12345;
55 return (unsigned int)((next / 65536) % 32768);
56}
57
58static inline void simple_srand(unsigned long seed)
59{
60 next = seed;
61}
62
63static 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
71static 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
97static int multiblock_erase(int ebnum, int blocks)
98{
99 int err;
100 struct erase_info ei;
101 loff_t addr = ebnum * mtd->erasesize;
102
103 memset(&ei, 0, sizeof(struct erase_info));
104 ei.mtd = mtd;
105 ei.addr = addr;
106 ei.len = mtd->erasesize * blocks;
107
108 err = mtd_erase(mtd, &ei);
109 if (err) {
110 printk(PRINT_PREF "error %d while erasing EB %d, blocks %d\n",
111 err, ebnum, blocks);
112 return err;
113 }
114
115 if (ei.state == MTD_ERASE_FAILED) {
116 printk(PRINT_PREF "some erase error occurred at EB %d,"
117 "blocks %d\n", ebnum, blocks);
118 return -EIO;
119 }
120
121 return 0;
122}
123
124static int erase_whole_device(void)
125{
126 int err;
127 unsigned int i;
128
129 for (i = 0; i < ebcnt; ++i) {
130 if (bbt[i])
131 continue;
132 err = erase_eraseblock(i);
133 if (err)
134 return err;
135 cond_resched();
136 }
137 return 0;
138}
139
140static int write_eraseblock(int ebnum)
141{
142 size_t written;
143 int err = 0;
144 loff_t addr = ebnum * mtd->erasesize;
145
146 err = mtd_write(mtd, addr, mtd->erasesize, &written, iobuf);
147 if (err || written != mtd->erasesize) {
148 printk(PRINT_PREF "error: write failed at %#llx\n", addr);
149 if (!err)
150 err = -EINVAL;
151 }
152
153 return err;
154}
155
156static int write_eraseblock_by_page(int ebnum)
157{
158 size_t written;
159 int i, err = 0;
160 loff_t addr = ebnum * mtd->erasesize;
161 void *buf = iobuf;
162
163 for (i = 0; i < pgcnt; i++) {
164 err = mtd_write(mtd, addr, pgsize, &written, buf);
165 if (err || written != pgsize) {
166 printk(PRINT_PREF "error: write failed at %#llx\n",
167 addr);
168 if (!err)
169 err = -EINVAL;
170 break;
171 }
172 addr += pgsize;
173 buf += pgsize;
174 }
175
176 return err;
177}
178
179static int write_eraseblock_by_2pages(int ebnum)
180{
181 size_t written, sz = pgsize * 2;
182 int i, n = pgcnt / 2, err = 0;
183 loff_t addr = ebnum * mtd->erasesize;
184 void *buf = iobuf;
185
186 for (i = 0; i < n; i++) {
187 err = mtd_write(mtd, addr, sz, &written, buf);
188 if (err || written != sz) {
189 printk(PRINT_PREF "error: write failed at %#llx\n",
190 addr);
191 if (!err)
192 err = -EINVAL;
193 return err;
194 }
195 addr += sz;
196 buf += sz;
197 }
198 if (pgcnt % 2) {
199 err = mtd_write(mtd, addr, pgsize, &written, buf);
200 if (err || written != pgsize) {
201 printk(PRINT_PREF "error: write failed at %#llx\n",
202 addr);
203 if (!err)
204 err = -EINVAL;
205 }
206 }
207
208 return err;
209}
210
211static int read_eraseblock(int ebnum)
212{
213 size_t read;
214 int err = 0;
215 loff_t addr = ebnum * mtd->erasesize;
216
217 err = mtd_read(mtd, addr, mtd->erasesize, &read, iobuf);
218 /* Ignore corrected ECC errors */
219 if (mtd_is_bitflip(err))
220 err = 0;
221 if (err || read != mtd->erasesize) {
222 printk(PRINT_PREF "error: read failed at %#llx\n", addr);
223 if (!err)
224 err = -EINVAL;
225 }
226
227 return err;
228}
229
230static int read_eraseblock_by_page(int ebnum)
231{
232 size_t read;
233 int i, err = 0;
234 loff_t addr = ebnum * mtd->erasesize;
235 void *buf = iobuf;
236
237 for (i = 0; i < pgcnt; i++) {
238 err = mtd_read(mtd, addr, pgsize, &read, buf);
239 /* Ignore corrected ECC errors */
240 if (mtd_is_bitflip(err))
241 err = 0;
242 if (err || read != pgsize) {
243 printk(PRINT_PREF "error: read failed at %#llx\n",
244 addr);
245 if (!err)
246 err = -EINVAL;
247 break;
248 }
249 addr += pgsize;
250 buf += pgsize;
251 }
252
253 return err;
254}
255
256static int read_eraseblock_by_2pages(int ebnum)
257{
258 size_t read, sz = pgsize * 2;
259 int i, n = pgcnt / 2, err = 0;
260 loff_t addr = ebnum * mtd->erasesize;
261 void *buf = iobuf;
262
263 for (i = 0; i < n; i++) {
264 err = mtd_read(mtd, addr, sz, &read, buf);
265 /* Ignore corrected ECC errors */
266 if (mtd_is_bitflip(err))
267 err = 0;
268 if (err || read != sz) {
269 printk(PRINT_PREF "error: read failed at %#llx\n",
270 addr);
271 if (!err)
272 err = -EINVAL;
273 return err;
274 }
275 addr += sz;
276 buf += sz;
277 }
278 if (pgcnt % 2) {
279 err = mtd_read(mtd, addr, pgsize, &read, buf);
280 /* Ignore corrected ECC errors */
281 if (mtd_is_bitflip(err))
282 err = 0;
283 if (err || read != pgsize) {
284 printk(PRINT_PREF "error: read failed at %#llx\n",
285 addr);
286 if (!err)
287 err = -EINVAL;
288 }
289 }
290
291 return err;
292}
293
294static int is_block_bad(int ebnum)
295{
296 loff_t addr = ebnum * mtd->erasesize;
297 int ret;
298
299 ret = mtd_block_isbad(mtd, addr);
300 if (ret)
301 printk(PRINT_PREF "block %d is bad\n", ebnum);
302 return ret;
303}
304
305static inline void start_timing(void)
306{
307 do_gettimeofday(&start);
308}
309
310static inline void stop_timing(void)
311{
312 do_gettimeofday(&finish);
313}
314
315static long calc_speed(void)
316{
317 uint64_t k;
318 long ms;
319
320 ms = (finish.tv_sec - start.tv_sec) * 1000 +
321 (finish.tv_usec - start.tv_usec) / 1000;
322 if (ms == 0)
323 return 0;
324 k = goodebcnt * (mtd->erasesize / 1024) * 1000;
325 do_div(k, ms);
326 return k;
327}
328
329static int scan_for_bad_eraseblocks(void)
330{
331 int i, bad = 0;
332
333 bbt = kzalloc(ebcnt, GFP_KERNEL);
334 if (!bbt) {
335 printk(PRINT_PREF "error: cannot allocate memory\n");
336 return -ENOMEM;
337 }
338
339 if (!mtd_can_have_bb(mtd))
340 goto out;
341
342 printk(PRINT_PREF "scanning for bad eraseblocks\n");
343 for (i = 0; i < ebcnt; ++i) {
344 bbt[i] = is_block_bad(i) ? 1 : 0;
345 if (bbt[i])
346 bad += 1;
347 cond_resched();
348 }
349 printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
350out:
351 goodebcnt = ebcnt - bad;
352 return 0;
353}
354
355static int __init mtd_speedtest_init(void)
356{
357 int err, i, blocks, j, k;
358 long speed;
359 uint64_t tmp;
360
361 printk(KERN_INFO "\n");
362 printk(KERN_INFO "=================================================\n");
363
364 if (dev < 0) {
365 printk(PRINT_PREF "Please specify a valid mtd-device via module paramter\n");
366 printk(KERN_CRIT "CAREFUL: This test wipes all data on the specified MTD device!\n");
367 return -EINVAL;
368 }
369
370 if (count)
371 printk(PRINT_PREF "MTD device: %d count: %d\n", dev, count);
372 else
373 printk(PRINT_PREF "MTD device: %d\n", dev);
374
375 mtd = get_mtd_device(NULL, dev);
376 if (IS_ERR(mtd)) {
377 err = PTR_ERR(mtd);
378 printk(PRINT_PREF "error: cannot get MTD device\n");
379 return err;
380 }
381
382 if (mtd->writesize == 1) {
383 printk(PRINT_PREF "not NAND flash, assume page size is 512 "
384 "bytes.\n");
385 pgsize = 512;
386 } else
387 pgsize = mtd->writesize;
388
389 tmp = mtd->size;
390 do_div(tmp, mtd->erasesize);
391 ebcnt = tmp;
392 pgcnt = mtd->erasesize / pgsize;
393
394 printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
395 "page size %u, count of eraseblocks %u, pages per "
396 "eraseblock %u, OOB size %u\n",
397 (unsigned long long)mtd->size, mtd->erasesize,
398 pgsize, ebcnt, pgcnt, mtd->oobsize);
399
400 if (count > 0 && count < ebcnt)
401 ebcnt = count;
402
403 err = -ENOMEM;
404 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
405 if (!iobuf) {
406 printk(PRINT_PREF "error: cannot allocate memory\n");
407 goto out;
408 }
409
410 simple_srand(1);
411 set_random_data(iobuf, mtd->erasesize);
412
413 err = scan_for_bad_eraseblocks();
414 if (err)
415 goto out;
416
417 err = erase_whole_device();
418 if (err)
419 goto out;
420
421 /* Write all eraseblocks, 1 eraseblock at a time */
422 printk(PRINT_PREF "testing eraseblock write speed\n");
423 start_timing();
424 for (i = 0; i < ebcnt; ++i) {
425 if (bbt[i])
426 continue;
427 err = write_eraseblock(i);
428 if (err)
429 goto out;
430 cond_resched();
431 }
432 stop_timing();
433 speed = calc_speed();
434 printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
435
436 /* Read all eraseblocks, 1 eraseblock at a time */
437 printk(PRINT_PREF "testing eraseblock read speed\n");
438 start_timing();
439 for (i = 0; i < ebcnt; ++i) {
440 if (bbt[i])
441 continue;
442 err = read_eraseblock(i);
443 if (err)
444 goto out;
445 cond_resched();
446 }
447 stop_timing();
448 speed = calc_speed();
449 printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
450
451 err = erase_whole_device();
452 if (err)
453 goto out;
454
455 /* Write all eraseblocks, 1 page at a time */
456 printk(PRINT_PREF "testing page write speed\n");
457 start_timing();
458 for (i = 0; i < ebcnt; ++i) {
459 if (bbt[i])
460 continue;
461 err = write_eraseblock_by_page(i);
462 if (err)
463 goto out;
464 cond_resched();
465 }
466 stop_timing();
467 speed = calc_speed();
468 printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
469
470 /* Read all eraseblocks, 1 page at a time */
471 printk(PRINT_PREF "testing page read speed\n");
472 start_timing();
473 for (i = 0; i < ebcnt; ++i) {
474 if (bbt[i])
475 continue;
476 err = read_eraseblock_by_page(i);
477 if (err)
478 goto out;
479 cond_resched();
480 }
481 stop_timing();
482 speed = calc_speed();
483 printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
484
485 err = erase_whole_device();
486 if (err)
487 goto out;
488
489 /* Write all eraseblocks, 2 pages at a time */
490 printk(PRINT_PREF "testing 2 page write speed\n");
491 start_timing();
492 for (i = 0; i < ebcnt; ++i) {
493 if (bbt[i])
494 continue;
495 err = write_eraseblock_by_2pages(i);
496 if (err)
497 goto out;
498 cond_resched();
499 }
500 stop_timing();
501 speed = calc_speed();
502 printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
503
504 /* Read all eraseblocks, 2 pages at a time */
505 printk(PRINT_PREF "testing 2 page read speed\n");
506 start_timing();
507 for (i = 0; i < ebcnt; ++i) {
508 if (bbt[i])
509 continue;
510 err = read_eraseblock_by_2pages(i);
511 if (err)
512 goto out;
513 cond_resched();
514 }
515 stop_timing();
516 speed = calc_speed();
517 printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
518
519 /* Erase all eraseblocks */
520 printk(PRINT_PREF "Testing erase speed\n");
521 start_timing();
522 for (i = 0; i < ebcnt; ++i) {
523 if (bbt[i])
524 continue;
525 err = erase_eraseblock(i);
526 if (err)
527 goto out;
528 cond_resched();
529 }
530 stop_timing();
531 speed = calc_speed();
532 printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
533
534 /* Multi-block erase all eraseblocks */
535 for (k = 1; k < 7; k++) {
536 blocks = 1 << k;
537 printk(PRINT_PREF "Testing %dx multi-block erase speed\n",
538 blocks);
539 start_timing();
540 for (i = 0; i < ebcnt; ) {
541 for (j = 0; j < blocks && (i + j) < ebcnt; j++)
542 if (bbt[i + j])
543 break;
544 if (j < 1) {
545 i++;
546 continue;
547 }
548 err = multiblock_erase(i, j);
549 if (err)
550 goto out;
551 cond_resched();
552 i += j;
553 }
554 stop_timing();
555 speed = calc_speed();
556 printk(PRINT_PREF "%dx multi-block erase speed is %ld KiB/s\n",
557 blocks, speed);
558 }
559 printk(PRINT_PREF "finished\n");
560out:
561 kfree(iobuf);
562 kfree(bbt);
563 put_mtd_device(mtd);
564 if (err)
565 printk(PRINT_PREF "error %d occurred\n", err);
566 printk(KERN_INFO "=================================================\n");
567 return err;
568}
569module_init(mtd_speedtest_init);
570
571static void __exit mtd_speedtest_exit(void)
572{
573 return;
574}
575module_exit(mtd_speedtest_exit);
576
577MODULE_DESCRIPTION("Speed test module");
578MODULE_AUTHOR("Adrian Hunter");
579MODULE_LICENSE("GPL");