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22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
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>
32
33#include "mtd_test.h"
34
35static int dev = -EINVAL;
36module_param(dev, int, S_IRUGO);
37MODULE_PARM_DESC(dev, "MTD device number to use");
38
39static int count;
40module_param(count, int, S_IRUGO);
41MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
42 "(0 means use all)");
43
44static struct mtd_info *mtd;
45static unsigned char *iobuf;
46static unsigned char *bbt;
47
48static int pgsize;
49static int ebcnt;
50static int pgcnt;
51static int goodebcnt;
52static struct timeval start, finish;
53
54static int multiblock_erase(int ebnum, int blocks)
55{
56 int err;
57 struct erase_info ei;
58 loff_t addr = ebnum * mtd->erasesize;
59
60 memset(&ei, 0, sizeof(struct erase_info));
61 ei.mtd = mtd;
62 ei.addr = addr;
63 ei.len = mtd->erasesize * blocks;
64
65 err = mtd_erase(mtd, &ei);
66 if (err) {
67 pr_err("error %d while erasing EB %d, blocks %d\n",
68 err, ebnum, blocks);
69 return err;
70 }
71
72 if (ei.state == MTD_ERASE_FAILED) {
73 pr_err("some erase error occurred at EB %d,"
74 "blocks %d\n", ebnum, blocks);
75 return -EIO;
76 }
77
78 return 0;
79}
80
81static int write_eraseblock(int ebnum)
82{
83 loff_t addr = ebnum * mtd->erasesize;
84
85 return mtdtest_write(mtd, addr, mtd->erasesize, iobuf);
86}
87
88static int write_eraseblock_by_page(int ebnum)
89{
90 int i, err = 0;
91 loff_t addr = ebnum * mtd->erasesize;
92 void *buf = iobuf;
93
94 for (i = 0; i < pgcnt; i++) {
95 err = mtdtest_write(mtd, addr, pgsize, buf);
96 if (err)
97 break;
98 addr += pgsize;
99 buf += pgsize;
100 }
101
102 return err;
103}
104
105static int write_eraseblock_by_2pages(int ebnum)
106{
107 size_t sz = pgsize * 2;
108 int i, n = pgcnt / 2, err = 0;
109 loff_t addr = ebnum * mtd->erasesize;
110 void *buf = iobuf;
111
112 for (i = 0; i < n; i++) {
113 err = mtdtest_write(mtd, addr, sz, buf);
114 if (err)
115 return err;
116 addr += sz;
117 buf += sz;
118 }
119 if (pgcnt % 2)
120 err = mtdtest_write(mtd, addr, pgsize, buf);
121
122 return err;
123}
124
125static int read_eraseblock(int ebnum)
126{
127 loff_t addr = ebnum * mtd->erasesize;
128
129 return mtdtest_read(mtd, addr, mtd->erasesize, iobuf);
130}
131
132static int read_eraseblock_by_page(int ebnum)
133{
134 int i, err = 0;
135 loff_t addr = ebnum * mtd->erasesize;
136 void *buf = iobuf;
137
138 for (i = 0; i < pgcnt; i++) {
139 err = mtdtest_read(mtd, addr, pgsize, buf);
140 if (err)
141 break;
142 addr += pgsize;
143 buf += pgsize;
144 }
145
146 return err;
147}
148
149static int read_eraseblock_by_2pages(int ebnum)
150{
151 size_t sz = pgsize * 2;
152 int i, n = pgcnt / 2, err = 0;
153 loff_t addr = ebnum * mtd->erasesize;
154 void *buf = iobuf;
155
156 for (i = 0; i < n; i++) {
157 err = mtdtest_read(mtd, addr, sz, buf);
158 if (err)
159 return err;
160 addr += sz;
161 buf += sz;
162 }
163 if (pgcnt % 2)
164 err = mtdtest_read(mtd, addr, pgsize, buf);
165
166 return err;
167}
168
169static inline void start_timing(void)
170{
171 do_gettimeofday(&start);
172}
173
174static inline void stop_timing(void)
175{
176 do_gettimeofday(&finish);
177}
178
179static long calc_speed(void)
180{
181 uint64_t k;
182 long ms;
183
184 ms = (finish.tv_sec - start.tv_sec) * 1000 +
185 (finish.tv_usec - start.tv_usec) / 1000;
186 if (ms == 0)
187 return 0;
188 k = goodebcnt * (mtd->erasesize / 1024) * 1000;
189 do_div(k, ms);
190 return k;
191}
192
193static int __init mtd_speedtest_init(void)
194{
195 int err, i, blocks, j, k;
196 long speed;
197 uint64_t tmp;
198
199 printk(KERN_INFO "\n");
200 printk(KERN_INFO "=================================================\n");
201
202 if (dev < 0) {
203 pr_info("Please specify a valid mtd-device via module parameter\n");
204 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
205 return -EINVAL;
206 }
207
208 if (count)
209 pr_info("MTD device: %d count: %d\n", dev, count);
210 else
211 pr_info("MTD device: %d\n", dev);
212
213 mtd = get_mtd_device(NULL, dev);
214 if (IS_ERR(mtd)) {
215 err = PTR_ERR(mtd);
216 pr_err("error: cannot get MTD device\n");
217 return err;
218 }
219
220 if (mtd->writesize == 1) {
221 pr_info("not NAND flash, assume page size is 512 "
222 "bytes.\n");
223 pgsize = 512;
224 } else
225 pgsize = mtd->writesize;
226
227 tmp = mtd->size;
228 do_div(tmp, mtd->erasesize);
229 ebcnt = tmp;
230 pgcnt = mtd->erasesize / pgsize;
231
232 pr_info("MTD device size %llu, eraseblock size %u, "
233 "page size %u, count of eraseblocks %u, pages per "
234 "eraseblock %u, OOB size %u\n",
235 (unsigned long long)mtd->size, mtd->erasesize,
236 pgsize, ebcnt, pgcnt, mtd->oobsize);
237
238 if (count > 0 && count < ebcnt)
239 ebcnt = count;
240
241 err = -ENOMEM;
242 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
243 if (!iobuf)
244 goto out;
245
246 prandom_bytes(iobuf, mtd->erasesize);
247
248 bbt = kzalloc(ebcnt, GFP_KERNEL);
249 if (!bbt)
250 goto out;
251 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
252 if (err)
253 goto out;
254 for (i = 0; i < ebcnt; i++) {
255 if (!bbt[i])
256 goodebcnt++;
257 }
258
259 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
260 if (err)
261 goto out;
262
263
264 pr_info("testing eraseblock write speed\n");
265 start_timing();
266 for (i = 0; i < ebcnt; ++i) {
267 if (bbt[i])
268 continue;
269 err = write_eraseblock(i);
270 if (err)
271 goto out;
272 cond_resched();
273 }
274 stop_timing();
275 speed = calc_speed();
276 pr_info("eraseblock write speed is %ld KiB/s\n", speed);
277
278
279 pr_info("testing eraseblock read speed\n");
280 start_timing();
281 for (i = 0; i < ebcnt; ++i) {
282 if (bbt[i])
283 continue;
284 err = read_eraseblock(i);
285 if (err)
286 goto out;
287 cond_resched();
288 }
289 stop_timing();
290 speed = calc_speed();
291 pr_info("eraseblock read speed is %ld KiB/s\n", speed);
292
293 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
294 if (err)
295 goto out;
296
297
298 pr_info("testing page write speed\n");
299 start_timing();
300 for (i = 0; i < ebcnt; ++i) {
301 if (bbt[i])
302 continue;
303 err = write_eraseblock_by_page(i);
304 if (err)
305 goto out;
306 cond_resched();
307 }
308 stop_timing();
309 speed = calc_speed();
310 pr_info("page write speed is %ld KiB/s\n", speed);
311
312
313 pr_info("testing page read speed\n");
314 start_timing();
315 for (i = 0; i < ebcnt; ++i) {
316 if (bbt[i])
317 continue;
318 err = read_eraseblock_by_page(i);
319 if (err)
320 goto out;
321 cond_resched();
322 }
323 stop_timing();
324 speed = calc_speed();
325 pr_info("page read speed is %ld KiB/s\n", speed);
326
327 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
328 if (err)
329 goto out;
330
331
332 pr_info("testing 2 page write speed\n");
333 start_timing();
334 for (i = 0; i < ebcnt; ++i) {
335 if (bbt[i])
336 continue;
337 err = write_eraseblock_by_2pages(i);
338 if (err)
339 goto out;
340 cond_resched();
341 }
342 stop_timing();
343 speed = calc_speed();
344 pr_info("2 page write speed is %ld KiB/s\n", speed);
345
346
347 pr_info("testing 2 page read speed\n");
348 start_timing();
349 for (i = 0; i < ebcnt; ++i) {
350 if (bbt[i])
351 continue;
352 err = read_eraseblock_by_2pages(i);
353 if (err)
354 goto out;
355 cond_resched();
356 }
357 stop_timing();
358 speed = calc_speed();
359 pr_info("2 page read speed is %ld KiB/s\n", speed);
360
361
362 pr_info("Testing erase speed\n");
363 start_timing();
364 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
365 if (err)
366 goto out;
367 stop_timing();
368 speed = calc_speed();
369 pr_info("erase speed is %ld KiB/s\n", speed);
370
371
372 for (k = 1; k < 7; k++) {
373 blocks = 1 << k;
374 pr_info("Testing %dx multi-block erase speed\n",
375 blocks);
376 start_timing();
377 for (i = 0; i < ebcnt; ) {
378 for (j = 0; j < blocks && (i + j) < ebcnt; j++)
379 if (bbt[i + j])
380 break;
381 if (j < 1) {
382 i++;
383 continue;
384 }
385 err = multiblock_erase(i, j);
386 if (err)
387 goto out;
388 cond_resched();
389 i += j;
390 }
391 stop_timing();
392 speed = calc_speed();
393 pr_info("%dx multi-block erase speed is %ld KiB/s\n",
394 blocks, speed);
395 }
396 pr_info("finished\n");
397out:
398 kfree(iobuf);
399 kfree(bbt);
400 put_mtd_device(mtd);
401 if (err)
402 pr_info("error %d occurred\n", err);
403 printk(KERN_INFO "=================================================\n");
404 return err;
405}
406module_init(mtd_speedtest_init);
407
408static void __exit mtd_speedtest_exit(void)
409{
410 return;
411}
412module_exit(mtd_speedtest_exit);
413
414MODULE_DESCRIPTION("Speed test module");
415MODULE_AUTHOR("Adrian Hunter");
416MODULE_LICENSE("GPL");
417
