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22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#include <asm/div64.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/moduleparam.h>
28#include <linux/err.h>
29#include <linux/mtd/mtd.h>
30#include <linux/slab.h>
31#include <linux/sched.h>
32#include <linux/random.h>
33
34#include "mtd_test.h"
35
36static int dev = -EINVAL;
37module_param(dev, int, S_IRUGO);
38MODULE_PARM_DESC(dev, "MTD device number to use");
39
40static struct mtd_info *mtd;
41static unsigned char *twopages;
42static unsigned char *writebuf;
43static unsigned char *boundary;
44static unsigned char *bbt;
45
46static int pgsize;
47static int bufsize;
48static int ebcnt;
49static int pgcnt;
50static int errcnt;
51static struct rnd_state rnd_state;
52
53static int write_eraseblock(int ebnum)
54{
55 loff_t addr = ebnum * mtd->erasesize;
56
57 prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
58 cond_resched();
59 return mtdtest_write(mtd, addr, mtd->erasesize, writebuf);
60}
61
62static int verify_eraseblock(int ebnum)
63{
64 uint32_t j;
65 int err = 0, i;
66 loff_t addr0, addrn;
67 loff_t addr = ebnum * mtd->erasesize;
68
69 addr0 = 0;
70 for (i = 0; i < ebcnt && bbt[i]; ++i)
71 addr0 += mtd->erasesize;
72
73 addrn = mtd->size;
74 for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
75 addrn -= mtd->erasesize;
76
77 prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
78 for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {
79
80 err = mtdtest_read(mtd, addr0, bufsize, twopages);
81 if (err)
82 return err;
83 err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages);
84 if (err)
85 return err;
86 memset(twopages, 0, bufsize);
87 err = mtdtest_read(mtd, addr, bufsize, twopages);
88 if (err)
89 break;
90 if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) {
91 pr_err("error: verify failed at %#llx\n",
92 (long long)addr);
93 errcnt += 1;
94 }
95 }
96
97 if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) {
98 struct rnd_state old_state = rnd_state;
99
100
101 err = mtdtest_read(mtd, addr0, bufsize, twopages);
102 if (err)
103 return err;
104 err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages);
105 if (err)
106 return err;
107 memset(twopages, 0, bufsize);
108 err = mtdtest_read(mtd, addr, bufsize, twopages);
109 if (err)
110 return err;
111 memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);
112 prandom_bytes_state(&rnd_state, boundary + pgsize, pgsize);
113 if (memcmp(twopages, boundary, bufsize)) {
114 pr_err("error: verify failed at %#llx\n",
115 (long long)addr);
116 errcnt += 1;
117 }
118 rnd_state = old_state;
119 }
120 return err;
121}
122
123static int crosstest(void)
124{
125 int err = 0, i;
126 loff_t addr, addr0, addrn;
127 unsigned char *pp1, *pp2, *pp3, *pp4;
128
129 pr_info("crosstest\n");
130 pp1 = kmalloc(pgsize * 4, GFP_KERNEL);
131 if (!pp1)
132 return -ENOMEM;
133 pp2 = pp1 + pgsize;
134 pp3 = pp2 + pgsize;
135 pp4 = pp3 + pgsize;
136 memset(pp1, 0, pgsize * 4);
137
138 addr0 = 0;
139 for (i = 0; i < ebcnt && bbt[i]; ++i)
140 addr0 += mtd->erasesize;
141
142 addrn = mtd->size;
143 for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
144 addrn -= mtd->erasesize;
145
146
147 addr = addrn - pgsize - pgsize;
148 err = mtdtest_read(mtd, addr, pgsize, pp1);
149 if (err) {
150 kfree(pp1);
151 return err;
152 }
153
154
155 addr = addrn - pgsize - pgsize - pgsize;
156 err = mtdtest_read(mtd, addr, pgsize, pp1);
157 if (err) {
158 kfree(pp1);
159 return err;
160 }
161
162
163 addr = addr0;
164 pr_info("reading page at %#llx\n", (long long)addr);
165 err = mtdtest_read(mtd, addr, pgsize, pp2);
166 if (err) {
167 kfree(pp1);
168 return err;
169 }
170
171
172 addr = addrn - pgsize;
173 pr_info("reading page at %#llx\n", (long long)addr);
174 err = mtdtest_read(mtd, addr, pgsize, pp3);
175 if (err) {
176 kfree(pp1);
177 return err;
178 }
179
180
181 addr = addr0;
182 pr_info("reading page at %#llx\n", (long long)addr);
183 err = mtdtest_read(mtd, addr, pgsize, pp4);
184 if (err) {
185 kfree(pp1);
186 return err;
187 }
188
189
190 pr_info("verifying pages read at %#llx match\n",
191 (long long)addr0);
192 if (memcmp(pp2, pp4, pgsize)) {
193 pr_err("verify failed!\n");
194 errcnt += 1;
195 } else if (!err)
196 pr_info("crosstest ok\n");
197 kfree(pp1);
198 return err;
199}
200
201static int erasecrosstest(void)
202{
203 int err = 0, i, ebnum, ebnum2;
204 loff_t addr0;
205 char *readbuf = twopages;
206
207 pr_info("erasecrosstest\n");
208
209 ebnum = 0;
210 addr0 = 0;
211 for (i = 0; i < ebcnt && bbt[i]; ++i) {
212 addr0 += mtd->erasesize;
213 ebnum += 1;
214 }
215
216 ebnum2 = ebcnt - 1;
217 while (ebnum2 && bbt[ebnum2])
218 ebnum2 -= 1;
219
220 pr_info("erasing block %d\n", ebnum);
221 err = mtdtest_erase_eraseblock(mtd, ebnum);
222 if (err)
223 return err;
224
225 pr_info("writing 1st page of block %d\n", ebnum);
226 prandom_bytes_state(&rnd_state, writebuf, pgsize);
227 strcpy(writebuf, "There is no data like this!");
228 err = mtdtest_write(mtd, addr0, pgsize, writebuf);
229 if (err)
230 return err;
231
232 pr_info("reading 1st page of block %d\n", ebnum);
233 memset(readbuf, 0, pgsize);
234 err = mtdtest_read(mtd, addr0, pgsize, readbuf);
235 if (err)
236 return err;
237
238 pr_info("verifying 1st page of block %d\n", ebnum);
239 if (memcmp(writebuf, readbuf, pgsize)) {
240 pr_err("verify failed!\n");
241 errcnt += 1;
242 return -1;
243 }
244
245 pr_info("erasing block %d\n", ebnum);
246 err = mtdtest_erase_eraseblock(mtd, ebnum);
247 if (err)
248 return err;
249
250 pr_info("writing 1st page of block %d\n", ebnum);
251 prandom_bytes_state(&rnd_state, writebuf, pgsize);
252 strcpy(writebuf, "There is no data like this!");
253 err = mtdtest_write(mtd, addr0, pgsize, writebuf);
254 if (err)
255 return err;
256
257 pr_info("erasing block %d\n", ebnum2);
258 err = mtdtest_erase_eraseblock(mtd, ebnum2);
259 if (err)
260 return err;
261
262 pr_info("reading 1st page of block %d\n", ebnum);
263 memset(readbuf, 0, pgsize);
264 err = mtdtest_read(mtd, addr0, pgsize, readbuf);
265 if (err)
266 return err;
267
268 pr_info("verifying 1st page of block %d\n", ebnum);
269 if (memcmp(writebuf, readbuf, pgsize)) {
270 pr_err("verify failed!\n");
271 errcnt += 1;
272 return -1;
273 }
274
275 if (!err)
276 pr_info("erasecrosstest ok\n");
277 return err;
278}
279
280static int erasetest(void)
281{
282 int err = 0, i, ebnum, ok = 1;
283 loff_t addr0;
284
285 pr_info("erasetest\n");
286
287 ebnum = 0;
288 addr0 = 0;
289 for (i = 0; i < ebcnt && bbt[i]; ++i) {
290 addr0 += mtd->erasesize;
291 ebnum += 1;
292 }
293
294 pr_info("erasing block %d\n", ebnum);
295 err = mtdtest_erase_eraseblock(mtd, ebnum);
296 if (err)
297 return err;
298
299 pr_info("writing 1st page of block %d\n", ebnum);
300 prandom_bytes_state(&rnd_state, writebuf, pgsize);
301 err = mtdtest_write(mtd, addr0, pgsize, writebuf);
302 if (err)
303 return err;
304
305 pr_info("erasing block %d\n", ebnum);
306 err = mtdtest_erase_eraseblock(mtd, ebnum);
307 if (err)
308 return err;
309
310 pr_info("reading 1st page of block %d\n", ebnum);
311 err = mtdtest_read(mtd, addr0, pgsize, twopages);
312 if (err)
313 return err;
314
315 pr_info("verifying 1st page of block %d is all 0xff\n",
316 ebnum);
317 for (i = 0; i < pgsize; ++i)
318 if (twopages[i] != 0xff) {
319 pr_err("verifying all 0xff failed at %d\n",
320 i);
321 errcnt += 1;
322 ok = 0;
323 break;
324 }
325
326 if (ok && !err)
327 pr_info("erasetest ok\n");
328
329 return err;
330}
331
332static int __init mtd_pagetest_init(void)
333{
334 int err = 0;
335 uint64_t tmp;
336 uint32_t i;
337
338 printk(KERN_INFO "\n");
339 printk(KERN_INFO "=================================================\n");
340
341 if (dev < 0) {
342 pr_info("Please specify a valid mtd-device via module parameter\n");
343 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
344 return -EINVAL;
345 }
346
347 pr_info("MTD device: %d\n", dev);
348
349 mtd = get_mtd_device(NULL, dev);
350 if (IS_ERR(mtd)) {
351 err = PTR_ERR(mtd);
352 pr_err("error: cannot get MTD device\n");
353 return err;
354 }
355
356 if (!mtd_type_is_nand(mtd)) {
357 pr_info("this test requires NAND flash\n");
358 goto out;
359 }
360
361 tmp = mtd->size;
362 do_div(tmp, mtd->erasesize);
363 ebcnt = tmp;
364 pgcnt = mtd->erasesize / mtd->writesize;
365 pgsize = mtd->writesize;
366
367 pr_info("MTD device size %llu, eraseblock size %u, "
368 "page size %u, count of eraseblocks %u, pages per "
369 "eraseblock %u, OOB size %u\n",
370 (unsigned long long)mtd->size, mtd->erasesize,
371 pgsize, ebcnt, pgcnt, mtd->oobsize);
372
373 err = -ENOMEM;
374 bufsize = pgsize * 2;
375 writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
376 if (!writebuf)
377 goto out;
378 twopages = kmalloc(bufsize, GFP_KERNEL);
379 if (!twopages)
380 goto out;
381 boundary = kmalloc(bufsize, GFP_KERNEL);
382 if (!boundary)
383 goto out;
384
385 bbt = kzalloc(ebcnt, GFP_KERNEL);
386 if (!bbt)
387 goto out;
388 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
389 if (err)
390 goto out;
391
392
393 pr_info("erasing whole device\n");
394 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
395 if (err)
396 goto out;
397 pr_info("erased %u eraseblocks\n", ebcnt);
398
399
400 prandom_seed_state(&rnd_state, 1);
401 pr_info("writing whole device\n");
402 for (i = 0; i < ebcnt; ++i) {
403 if (bbt[i])
404 continue;
405 err = write_eraseblock(i);
406 if (err)
407 goto out;
408 if (i % 256 == 0)
409 pr_info("written up to eraseblock %u\n", i);
410 cond_resched();
411 }
412 pr_info("written %u eraseblocks\n", i);
413
414
415 prandom_seed_state(&rnd_state, 1);
416 pr_info("verifying all eraseblocks\n");
417 for (i = 0; i < ebcnt; ++i) {
418 if (bbt[i])
419 continue;
420 err = verify_eraseblock(i);
421 if (err)
422 goto out;
423 if (i % 256 == 0)
424 pr_info("verified up to eraseblock %u\n", i);
425 cond_resched();
426 }
427 pr_info("verified %u eraseblocks\n", i);
428
429 err = crosstest();
430 if (err)
431 goto out;
432
433 err = erasecrosstest();
434 if (err)
435 goto out;
436
437 err = erasetest();
438 if (err)
439 goto out;
440
441 pr_info("finished with %d errors\n", errcnt);
442out:
443
444 kfree(bbt);
445 kfree(boundary);
446 kfree(twopages);
447 kfree(writebuf);
448 put_mtd_device(mtd);
449 if (err)
450 pr_info("error %d occurred\n", err);
451 printk(KERN_INFO "=================================================\n");
452 return err;
453}
454module_init(mtd_pagetest_init);
455
456static void __exit mtd_pagetest_exit(void)
457{
458 return;
459}
460module_exit(mtd_pagetest_exit);
461
462MODULE_DESCRIPTION("NAND page test");
463MODULE_AUTHOR("Adrian Hunter");
464MODULE_LICENSE("GPL");
465
