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mtd_pagetest.c
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1 /*
2  * Copyright (C) 2006-2008 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 page read and write on MTD device.
18  *
19  * Author: Adrian Hunter <[email protected]>
20  */
21 
22 #include <asm/div64.h>
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/err.h>
27 #include <linux/mtd/mtd.h>
28 #include <linux/slab.h>
29 #include <linux/sched.h>
30 
31 #define PRINT_PREF KERN_INFO "mtd_pagetest: "
32 
33 static int dev = -EINVAL;
34 module_param(dev, int, S_IRUGO);
35 MODULE_PARM_DESC(dev, "MTD device number to use");
36 
37 static struct mtd_info *mtd;
38 static unsigned char *twopages;
39 static unsigned char *writebuf;
40 static unsigned char *boundary;
41 static unsigned char *bbt;
42 
43 static int pgsize;
44 static int bufsize;
45 static int ebcnt;
46 static int pgcnt;
47 static int errcnt;
48 static unsigned long next = 1;
49 
50 static inline unsigned int simple_rand(void)
51 {
52  next = next * 1103515245 + 12345;
53  return (unsigned int)((next / 65536) % 32768);
54 }
55 
56 static inline void simple_srand(unsigned long seed)
57 {
58  next = seed;
59 }
60 
61 static void set_random_data(unsigned char *buf, size_t len)
62 {
63  size_t i;
64 
65  for (i = 0; i < len; ++i)
66  buf[i] = simple_rand();
67 }
68 
69 static int erase_eraseblock(int ebnum)
70 {
71  int err;
72  struct erase_info ei;
73  loff_t addr = ebnum * mtd->erasesize;
74 
75  memset(&ei, 0, sizeof(struct erase_info));
76  ei.mtd = mtd;
77  ei.addr = addr;
78  ei.len = mtd->erasesize;
79 
80  err = mtd_erase(mtd, &ei);
81  if (err) {
82  printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
83  return err;
84  }
85 
86  if (ei.state == MTD_ERASE_FAILED) {
87  printk(PRINT_PREF "some erase error occurred at EB %d\n",
88  ebnum);
89  return -EIO;
90  }
91 
92  return 0;
93 }
94 
95 static int write_eraseblock(int ebnum)
96 {
97  int err = 0;
98  size_t written;
99  loff_t addr = ebnum * mtd->erasesize;
100 
101  set_random_data(writebuf, mtd->erasesize);
102  cond_resched();
103  err = mtd_write(mtd, addr, mtd->erasesize, &written, writebuf);
104  if (err || written != mtd->erasesize)
105  printk(PRINT_PREF "error: write failed at %#llx\n",
106  (long long)addr);
107 
108  return err;
109 }
110 
111 static int verify_eraseblock(int ebnum)
112 {
113  uint32_t j;
114  size_t read;
115  int err = 0, i;
116  loff_t addr0, addrn;
117  loff_t addr = ebnum * mtd->erasesize;
118 
119  addr0 = 0;
120  for (i = 0; i < ebcnt && bbt[i]; ++i)
121  addr0 += mtd->erasesize;
122 
123  addrn = mtd->size;
124  for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
125  addrn -= mtd->erasesize;
126 
127  set_random_data(writebuf, mtd->erasesize);
128  for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {
129  /* Do a read to set the internal dataRAMs to different data */
130  err = mtd_read(mtd, addr0, bufsize, &read, twopages);
131  if (mtd_is_bitflip(err))
132  err = 0;
133  if (err || read != bufsize) {
134  printk(PRINT_PREF "error: read failed at %#llx\n",
135  (long long)addr0);
136  return err;
137  }
138  err = mtd_read(mtd, addrn - bufsize, bufsize, &read, twopages);
139  if (mtd_is_bitflip(err))
140  err = 0;
141  if (err || read != bufsize) {
142  printk(PRINT_PREF "error: read failed at %#llx\n",
143  (long long)(addrn - bufsize));
144  return err;
145  }
146  memset(twopages, 0, bufsize);
147  err = mtd_read(mtd, addr, bufsize, &read, twopages);
148  if (mtd_is_bitflip(err))
149  err = 0;
150  if (err || read != bufsize) {
151  printk(PRINT_PREF "error: read failed at %#llx\n",
152  (long long)addr);
153  break;
154  }
155  if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) {
156  printk(PRINT_PREF "error: verify failed at %#llx\n",
157  (long long)addr);
158  errcnt += 1;
159  }
160  }
161  /* Check boundary between eraseblocks */
162  if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) {
163  unsigned long oldnext = next;
164  /* Do a read to set the internal dataRAMs to different data */
165  err = mtd_read(mtd, addr0, bufsize, &read, twopages);
166  if (mtd_is_bitflip(err))
167  err = 0;
168  if (err || read != bufsize) {
169  printk(PRINT_PREF "error: read failed at %#llx\n",
170  (long long)addr0);
171  return err;
172  }
173  err = mtd_read(mtd, addrn - bufsize, bufsize, &read, twopages);
174  if (mtd_is_bitflip(err))
175  err = 0;
176  if (err || read != bufsize) {
177  printk(PRINT_PREF "error: read failed at %#llx\n",
178  (long long)(addrn - bufsize));
179  return err;
180  }
181  memset(twopages, 0, bufsize);
182  err = mtd_read(mtd, addr, bufsize, &read, twopages);
183  if (mtd_is_bitflip(err))
184  err = 0;
185  if (err || read != bufsize) {
186  printk(PRINT_PREF "error: read failed at %#llx\n",
187  (long long)addr);
188  return err;
189  }
190  memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);
191  set_random_data(boundary + pgsize, pgsize);
192  if (memcmp(twopages, boundary, bufsize)) {
193  printk(PRINT_PREF "error: verify failed at %#llx\n",
194  (long long)addr);
195  errcnt += 1;
196  }
197  next = oldnext;
198  }
199  return err;
200 }
201 
202 static int crosstest(void)
203 {
204  size_t read;
205  int err = 0, i;
206  loff_t addr, addr0, addrn;
207  unsigned char *pp1, *pp2, *pp3, *pp4;
208 
209  printk(PRINT_PREF "crosstest\n");
210  pp1 = kmalloc(pgsize * 4, GFP_KERNEL);
211  if (!pp1) {
212  printk(PRINT_PREF "error: cannot allocate memory\n");
213  return -ENOMEM;
214  }
215  pp2 = pp1 + pgsize;
216  pp3 = pp2 + pgsize;
217  pp4 = pp3 + pgsize;
218  memset(pp1, 0, pgsize * 4);
219 
220  addr0 = 0;
221  for (i = 0; i < ebcnt && bbt[i]; ++i)
222  addr0 += mtd->erasesize;
223 
224  addrn = mtd->size;
225  for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
226  addrn -= mtd->erasesize;
227 
228  /* Read 2nd-to-last page to pp1 */
229  addr = addrn - pgsize - pgsize;
230  err = mtd_read(mtd, addr, pgsize, &read, pp1);
231  if (mtd_is_bitflip(err))
232  err = 0;
233  if (err || read != pgsize) {
234  printk(PRINT_PREF "error: read failed at %#llx\n",
235  (long long)addr);
236  kfree(pp1);
237  return err;
238  }
239 
240  /* Read 3rd-to-last page to pp1 */
241  addr = addrn - pgsize - pgsize - pgsize;
242  err = mtd_read(mtd, addr, pgsize, &read, pp1);
243  if (mtd_is_bitflip(err))
244  err = 0;
245  if (err || read != pgsize) {
246  printk(PRINT_PREF "error: read failed at %#llx\n",
247  (long long)addr);
248  kfree(pp1);
249  return err;
250  }
251 
252  /* Read first page to pp2 */
253  addr = addr0;
254  printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);
255  err = mtd_read(mtd, addr, pgsize, &read, pp2);
256  if (mtd_is_bitflip(err))
257  err = 0;
258  if (err || read != pgsize) {
259  printk(PRINT_PREF "error: read failed at %#llx\n",
260  (long long)addr);
261  kfree(pp1);
262  return err;
263  }
264 
265  /* Read last page to pp3 */
266  addr = addrn - pgsize;
267  printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);
268  err = mtd_read(mtd, addr, pgsize, &read, pp3);
269  if (mtd_is_bitflip(err))
270  err = 0;
271  if (err || read != pgsize) {
272  printk(PRINT_PREF "error: read failed at %#llx\n",
273  (long long)addr);
274  kfree(pp1);
275  return err;
276  }
277 
278  /* Read first page again to pp4 */
279  addr = addr0;
280  printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);
281  err = mtd_read(mtd, addr, pgsize, &read, pp4);
282  if (mtd_is_bitflip(err))
283  err = 0;
284  if (err || read != pgsize) {
285  printk(PRINT_PREF "error: read failed at %#llx\n",
286  (long long)addr);
287  kfree(pp1);
288  return err;
289  }
290 
291  /* pp2 and pp4 should be the same */
292  printk(PRINT_PREF "verifying pages read at %#llx match\n",
293  (long long)addr0);
294  if (memcmp(pp2, pp4, pgsize)) {
295  printk(PRINT_PREF "verify failed!\n");
296  errcnt += 1;
297  } else if (!err)
298  printk(PRINT_PREF "crosstest ok\n");
299  kfree(pp1);
300  return err;
301 }
302 
303 static int erasecrosstest(void)
304 {
305  size_t read, written;
306  int err = 0, i, ebnum, ebnum2;
307  loff_t addr0;
308  char *readbuf = twopages;
309 
310  printk(PRINT_PREF "erasecrosstest\n");
311 
312  ebnum = 0;
313  addr0 = 0;
314  for (i = 0; i < ebcnt && bbt[i]; ++i) {
315  addr0 += mtd->erasesize;
316  ebnum += 1;
317  }
318 
319  ebnum2 = ebcnt - 1;
320  while (ebnum2 && bbt[ebnum2])
321  ebnum2 -= 1;
322 
323  printk(PRINT_PREF "erasing block %d\n", ebnum);
324  err = erase_eraseblock(ebnum);
325  if (err)
326  return err;
327 
328  printk(PRINT_PREF "writing 1st page of block %d\n", ebnum);
329  set_random_data(writebuf, pgsize);
330  strcpy(writebuf, "There is no data like this!");
331  err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
332  if (err || written != pgsize) {
333  printk(PRINT_PREF "error: write failed at %#llx\n",
334  (long long)addr0);
335  return err ? err : -1;
336  }
337 
338  printk(PRINT_PREF "reading 1st page of block %d\n", ebnum);
339  memset(readbuf, 0, pgsize);
340  err = mtd_read(mtd, addr0, pgsize, &read, readbuf);
341  if (mtd_is_bitflip(err))
342  err = 0;
343  if (err || read != pgsize) {
344  printk(PRINT_PREF "error: read failed at %#llx\n",
345  (long long)addr0);
346  return err ? err : -1;
347  }
348 
349  printk(PRINT_PREF "verifying 1st page of block %d\n", ebnum);
350  if (memcmp(writebuf, readbuf, pgsize)) {
351  printk(PRINT_PREF "verify failed!\n");
352  errcnt += 1;
353  return -1;
354  }
355 
356  printk(PRINT_PREF "erasing block %d\n", ebnum);
357  err = erase_eraseblock(ebnum);
358  if (err)
359  return err;
360 
361  printk(PRINT_PREF "writing 1st page of block %d\n", ebnum);
362  set_random_data(writebuf, pgsize);
363  strcpy(writebuf, "There is no data like this!");
364  err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
365  if (err || written != pgsize) {
366  printk(PRINT_PREF "error: write failed at %#llx\n",
367  (long long)addr0);
368  return err ? err : -1;
369  }
370 
371  printk(PRINT_PREF "erasing block %d\n", ebnum2);
372  err = erase_eraseblock(ebnum2);
373  if (err)
374  return err;
375 
376  printk(PRINT_PREF "reading 1st page of block %d\n", ebnum);
377  memset(readbuf, 0, pgsize);
378  err = mtd_read(mtd, addr0, pgsize, &read, readbuf);
379  if (mtd_is_bitflip(err))
380  err = 0;
381  if (err || read != pgsize) {
382  printk(PRINT_PREF "error: read failed at %#llx\n",
383  (long long)addr0);
384  return err ? err : -1;
385  }
386 
387  printk(PRINT_PREF "verifying 1st page of block %d\n", ebnum);
388  if (memcmp(writebuf, readbuf, pgsize)) {
389  printk(PRINT_PREF "verify failed!\n");
390  errcnt += 1;
391  return -1;
392  }
393 
394  if (!err)
395  printk(PRINT_PREF "erasecrosstest ok\n");
396  return err;
397 }
398 
399 static int erasetest(void)
400 {
401  size_t read, written;
402  int err = 0, i, ebnum, ok = 1;
403  loff_t addr0;
404 
405  printk(PRINT_PREF "erasetest\n");
406 
407  ebnum = 0;
408  addr0 = 0;
409  for (i = 0; i < ebcnt && bbt[i]; ++i) {
410  addr0 += mtd->erasesize;
411  ebnum += 1;
412  }
413 
414  printk(PRINT_PREF "erasing block %d\n", ebnum);
415  err = erase_eraseblock(ebnum);
416  if (err)
417  return err;
418 
419  printk(PRINT_PREF "writing 1st page of block %d\n", ebnum);
420  set_random_data(writebuf, pgsize);
421  err = mtd_write(mtd, addr0, pgsize, &written, writebuf);
422  if (err || written != pgsize) {
423  printk(PRINT_PREF "error: write failed at %#llx\n",
424  (long long)addr0);
425  return err ? err : -1;
426  }
427 
428  printk(PRINT_PREF "erasing block %d\n", ebnum);
429  err = erase_eraseblock(ebnum);
430  if (err)
431  return err;
432 
433  printk(PRINT_PREF "reading 1st page of block %d\n", ebnum);
434  err = mtd_read(mtd, addr0, pgsize, &read, twopages);
435  if (mtd_is_bitflip(err))
436  err = 0;
437  if (err || read != pgsize) {
438  printk(PRINT_PREF "error: read failed at %#llx\n",
439  (long long)addr0);
440  return err ? err : -1;
441  }
442 
443  printk(PRINT_PREF "verifying 1st page of block %d is all 0xff\n",
444  ebnum);
445  for (i = 0; i < pgsize; ++i)
446  if (twopages[i] != 0xff) {
447  printk(PRINT_PREF "verifying all 0xff failed at %d\n",
448  i);
449  errcnt += 1;
450  ok = 0;
451  break;
452  }
453 
454  if (ok && !err)
455  printk(PRINT_PREF "erasetest ok\n");
456 
457  return err;
458 }
459 
460 static int is_block_bad(int ebnum)
461 {
462  loff_t addr = ebnum * mtd->erasesize;
463  int ret;
464 
465  ret = mtd_block_isbad(mtd, addr);
466  if (ret)
467  printk(PRINT_PREF "block %d is bad\n", ebnum);
468  return ret;
469 }
470 
471 static int scan_for_bad_eraseblocks(void)
472 {
473  int i, bad = 0;
474 
475  bbt = kzalloc(ebcnt, GFP_KERNEL);
476  if (!bbt) {
477  printk(PRINT_PREF "error: cannot allocate memory\n");
478  return -ENOMEM;
479  }
480 
481  printk(PRINT_PREF "scanning for bad eraseblocks\n");
482  for (i = 0; i < ebcnt; ++i) {
483  bbt[i] = is_block_bad(i) ? 1 : 0;
484  if (bbt[i])
485  bad += 1;
486  cond_resched();
487  }
488  printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
489  return 0;
490 }
491 
492 static int __init mtd_pagetest_init(void)
493 {
494  int err = 0;
495  uint64_t tmp;
496  uint32_t i;
497 
498  printk(KERN_INFO "\n");
499  printk(KERN_INFO "=================================================\n");
500 
501  if (dev < 0) {
502  printk(PRINT_PREF "Please specify a valid mtd-device via module paramter\n");
503  printk(KERN_CRIT "CAREFUL: This test wipes all data on the specified MTD device!\n");
504  return -EINVAL;
505  }
506 
507  printk(PRINT_PREF "MTD device: %d\n", dev);
508 
509  mtd = get_mtd_device(NULL, dev);
510  if (IS_ERR(mtd)) {
511  err = PTR_ERR(mtd);
512  printk(PRINT_PREF "error: cannot get MTD device\n");
513  return err;
514  }
515 
516  if (mtd->type != MTD_NANDFLASH) {
517  printk(PRINT_PREF "this test requires NAND flash\n");
518  goto out;
519  }
520 
521  tmp = mtd->size;
522  do_div(tmp, mtd->erasesize);
523  ebcnt = tmp;
524  pgcnt = mtd->erasesize / mtd->writesize;
525  pgsize = mtd->writesize;
526 
527  printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
528  "page size %u, count of eraseblocks %u, pages per "
529  "eraseblock %u, OOB size %u\n",
530  (unsigned long long)mtd->size, mtd->erasesize,
531  pgsize, ebcnt, pgcnt, mtd->oobsize);
532 
533  err = -ENOMEM;
534  bufsize = pgsize * 2;
535  writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
536  if (!writebuf) {
537  printk(PRINT_PREF "error: cannot allocate memory\n");
538  goto out;
539  }
540  twopages = kmalloc(bufsize, GFP_KERNEL);
541  if (!twopages) {
542  printk(PRINT_PREF "error: cannot allocate memory\n");
543  goto out;
544  }
545  boundary = kmalloc(bufsize, GFP_KERNEL);
546  if (!boundary) {
547  printk(PRINT_PREF "error: cannot allocate memory\n");
548  goto out;
549  }
550 
551  err = scan_for_bad_eraseblocks();
552  if (err)
553  goto out;
554 
555  /* Erase all eraseblocks */
556  printk(PRINT_PREF "erasing whole device\n");
557  for (i = 0; i < ebcnt; ++i) {
558  if (bbt[i])
559  continue;
560  err = erase_eraseblock(i);
561  if (err)
562  goto out;
563  cond_resched();
564  }
565  printk(PRINT_PREF "erased %u eraseblocks\n", i);
566 
567  /* Write all eraseblocks */
568  simple_srand(1);
569  printk(PRINT_PREF "writing whole device\n");
570  for (i = 0; i < ebcnt; ++i) {
571  if (bbt[i])
572  continue;
573  err = write_eraseblock(i);
574  if (err)
575  goto out;
576  if (i % 256 == 0)
577  printk(PRINT_PREF "written up to eraseblock %u\n", i);
578  cond_resched();
579  }
580  printk(PRINT_PREF "written %u eraseblocks\n", i);
581 
582  /* Check all eraseblocks */
583  simple_srand(1);
584  printk(PRINT_PREF "verifying all eraseblocks\n");
585  for (i = 0; i < ebcnt; ++i) {
586  if (bbt[i])
587  continue;
588  err = verify_eraseblock(i);
589  if (err)
590  goto out;
591  if (i % 256 == 0)
592  printk(PRINT_PREF "verified up to eraseblock %u\n", i);
593  cond_resched();
594  }
595  printk(PRINT_PREF "verified %u eraseblocks\n", i);
596 
597  err = crosstest();
598  if (err)
599  goto out;
600 
601  err = erasecrosstest();
602  if (err)
603  goto out;
604 
605  err = erasetest();
606  if (err)
607  goto out;
608 
609  printk(PRINT_PREF "finished with %d errors\n", errcnt);
610 out:
611 
612  kfree(bbt);
613  kfree(boundary);
614  kfree(twopages);
615  kfree(writebuf);
616  put_mtd_device(mtd);
617  if (err)
618  printk(PRINT_PREF "error %d occurred\n", err);
619  printk(KERN_INFO "=================================================\n");
620  return err;
621 }
622 module_init(mtd_pagetest_init);
623 
624 static void __exit mtd_pagetest_exit(void)
625 {
626  return;
627 }
628 module_exit(mtd_pagetest_exit);
629 
630 MODULE_DESCRIPTION("NAND page test");
631 MODULE_AUTHOR("Adrian Hunter");
632 MODULE_LICENSE("GPL");
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