drivers/mtd/tests/mtd_pagetest.c

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