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 <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
31static int dev;
32module_param(dev, int, S_IRUGO);
33MODULE_PARM_DESC(dev, "MTD device number to use");
34
35static struct mtd_info *mtd;
36static unsigned char *iobuf;
37static unsigned char *bbt;
38
39static int pgsize;
40static int ebcnt;
41static int pgcnt;
42static int goodebcnt;
43static struct timeval start, finish;
44static unsigned long next = 1;
45
46static inline unsigned int simple_rand(void)
47{
48 next = next * 1103515245 + 12345;
49 return (unsigned int)((next / 65536) % 32768);
50}
51
52static inline void simple_srand(unsigned long seed)
53{
54 next = seed;
55}
56
57static 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
65static 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
91static 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
107static 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
123static 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
146static 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
178static 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
197static 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
223static 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
261static 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
272static inline void start_timing(void)
273{
274 do_gettimeofday(&start);
275}
276
277static inline void stop_timing(void)
278{
279 do_gettimeofday(&finish);
280}
281
282static 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
293static 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
304 printk(PRINT_PREF "scanning for bad eraseblocks\n");
305 for (i = 0; i < ebcnt; ++i) {
306 bbt[i] = is_block_bad(i) ? 1 : 0;
307 if (bbt[i])
308 bad += 1;
309 cond_resched();
310 }
311 printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
312 goodebcnt = ebcnt - bad;
313 return 0;
314}
315
316static int __init mtd_speedtest_init(void)
317{
318 int err, i;
319 long speed;
320 uint64_t tmp;
321
322 printk(KERN_INFO "\n");
323 printk(KERN_INFO "=================================================\n");
324 printk(PRINT_PREF "MTD device: %d\n", dev);
325
326 mtd = get_mtd_device(NULL, dev);
327 if (IS_ERR(mtd)) {
328 err = PTR_ERR(mtd);
329 printk(PRINT_PREF "error: cannot get MTD device\n");
330 return err;
331 }
332
333 if (mtd->writesize == 1) {
334 printk(PRINT_PREF "not NAND flash, assume page size is 512 "
335 "bytes.\n");
336 pgsize = 512;
337 } else
338 pgsize = mtd->writesize;
339
340 tmp = mtd->size;
341 do_div(tmp, mtd->erasesize);
342 ebcnt = tmp;
343 pgcnt = mtd->erasesize / mtd->writesize;
344
345 printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
346 "page size %u, count of eraseblocks %u, pages per "
347 "eraseblock %u, OOB size %u\n",
348 (unsigned long long)mtd->size, mtd->erasesize,
349 pgsize, ebcnt, pgcnt, mtd->oobsize);
350
351 err = -ENOMEM;
352 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
353 if (!iobuf) {
354 printk(PRINT_PREF "error: cannot allocate memory\n");
355 goto out;
356 }
357
358 simple_srand(1);
359 set_random_data(iobuf, mtd->erasesize);
360
361 err = scan_for_bad_eraseblocks();
362 if (err)
363 goto out;
364
365 err = erase_whole_device();
366 if (err)
367 goto out;
368
369 /* Write all eraseblocks, 1 eraseblock at a time */
370 printk(PRINT_PREF "testing eraseblock write speed\n");
371 start_timing();
372 for (i = 0; i < ebcnt; ++i) {
373 if (bbt[i])
374 continue;
375 err = write_eraseblock(i);
376 if (err)
377 goto out;
378 cond_resched();
379 }
380 stop_timing();
381 speed = calc_speed();
382 printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
383
384 /* Read all eraseblocks, 1 eraseblock at a time */
385 printk(PRINT_PREF "testing eraseblock read speed\n");
386 start_timing();
387 for (i = 0; i < ebcnt; ++i) {
388 if (bbt[i])
389 continue;
390 err = read_eraseblock(i);
391 if (err)
392 goto out;
393 cond_resched();
394 }
395 stop_timing();
396 speed = calc_speed();
397 printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
398
399 err = erase_whole_device();
400 if (err)
401 goto out;
402
403 /* Write all eraseblocks, 1 page at a time */
404 printk(PRINT_PREF "testing page write speed\n");
405 start_timing();
406 for (i = 0; i < ebcnt; ++i) {
407 if (bbt[i])
408 continue;
409 err = write_eraseblock_by_page(i);
410 if (err)
411 goto out;
412 cond_resched();
413 }
414 stop_timing();
415 speed = calc_speed();
416 printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
417
418 /* Read all eraseblocks, 1 page at a time */
419 printk(PRINT_PREF "testing page read speed\n");
420 start_timing();
421 for (i = 0; i < ebcnt; ++i) {
422 if (bbt[i])
423 continue;
424 err = read_eraseblock_by_page(i);
425 if (err)
426 goto out;
427 cond_resched();
428 }
429 stop_timing();
430 speed = calc_speed();
431 printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
432
433 err = erase_whole_device();
434 if (err)
435 goto out;
436
437 /* Write all eraseblocks, 2 pages at a time */
438 printk(PRINT_PREF "testing 2 page write speed\n");
439 start_timing();
440 for (i = 0; i < ebcnt; ++i) {
441 if (bbt[i])
442 continue;
443 err = write_eraseblock_by_2pages(i);
444 if (err)
445 goto out;
446 cond_resched();
447 }
448 stop_timing();
449 speed = calc_speed();
450 printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
451
452 /* Read all eraseblocks, 2 pages at a time */
453 printk(PRINT_PREF "testing 2 page read speed\n");
454 start_timing();
455 for (i = 0; i < ebcnt; ++i) {
456 if (bbt[i])
457 continue;
458 err = read_eraseblock_by_2pages(i);
459 if (err)
460 goto out;
461 cond_resched();
462 }
463 stop_timing();
464 speed = calc_speed();
465 printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
466
467 /* Erase all eraseblocks */
468 printk(PRINT_PREF "Testing erase speed\n");
469 start_timing();
470 for (i = 0; i < ebcnt; ++i) {
471 if (bbt[i])
472 continue;
473 err = erase_eraseblock(i);
474 if (err)
475 goto out;
476 cond_resched();
477 }
478 stop_timing();
479 speed = calc_speed();
480 printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
481
482 printk(PRINT_PREF "finished\n");
483out:
484 kfree(iobuf);
485 kfree(bbt);
486 put_mtd_device(mtd);
487 if (err)
488 printk(PRINT_PREF "error %d occurred\n", err);
489 printk(KERN_INFO "=================================================\n");
490 return err;
491}
492module_init(mtd_speedtest_init);
493
494static void __exit mtd_speedtest_exit(void)
495{
496 return;
497}
498module_exit(mtd_speedtest_exit);
499
500MODULE_DESCRIPTION("Speed test module");
501MODULE_AUTHOR("Adrian Hunter");
502MODULE_LICENSE("GPL");