drivers/mtd/tests/mtd_oobtest.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 OOB 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/slab.h>
  29 #include <linux/sched.h>
  30
  31 #define PRINT_PREF KERN_INFO "mtd_oobtest: "
  32
  33 static int dev;
  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 *readbuf;
  39 static unsigned char *writebuf;
  40 static unsigned char *bbt;
  41
  42 static int ebcnt;
  43 static int pgcnt;
  44 static int errcnt;
  45 static int use_offset;
  46 static int use_len;
  47 static int use_len_max;
  48 static int vary_offset;
  49 static unsigned long next = 1;
  50
  51 static inline unsigned int simple_rand(void)
  52 {
  53         next = next * 1103515245 + 12345;
  54         return (unsigned int)((next / 65536) % 32768);
  55 }
  56
  57 static inline void simple_srand(unsigned long seed)
  58 {
  59         next = seed;
  60 }
  61
  62 static void set_random_data(unsigned char *buf, size_t len)
  63 {
  64         size_t i;
  65
  66         for (i = 0; i < len; ++i)
  67                 buf[i] = simple_rand();
  68 }
  69
  70 static int erase_eraseblock(int ebnum)
  71 {
  72         int err;
  73         struct erase_info ei;
  74         loff_t addr = ebnum * mtd->erasesize;
  75
  76         memset(&ei, 0, sizeof(struct erase_info));
  77         ei.mtd  = mtd;
  78         ei.addr = addr;
  79         ei.len  = mtd->erasesize;
  80
  81         err = mtd->erase(mtd, &ei);
  82         if (err) {
  83                 printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
  84                 return err;
  85         }
  86
  87         if (ei.state == MTD_ERASE_FAILED) {
  88                 printk(PRINT_PREF "some erase error occurred at EB %d\n",
  89                        ebnum);
  90                 return -EIO;
  91         }
  92
  93         return 0;
  94 }
  95
  96 static int erase_whole_device(void)
  97 {
  98         int err;
  99         unsigned int i;
 100
 101         printk(PRINT_PREF "erasing whole device\n");
 102         for (i = 0; i < ebcnt; ++i) {
 103                 if (bbt[i])
 104                         continue;
 105                 err = erase_eraseblock(i);
 106                 if (err)
 107                         return err;
 108                 cond_resched();
 109         }
 110         printk(PRINT_PREF "erased %u eraseblocks\n", i);
 111         return 0;
 112 }
 113
 114 static void do_vary_offset(void)
 115 {
 116         use_len -= 1;
 117         if (use_len < 1) {
 118                 use_offset += 1;
 119                 if (use_offset >= use_len_max)
 120                         use_offset = 0;
 121                 use_len = use_len_max - use_offset;
 122         }
 123 }
 124
 125 static int write_eraseblock(int ebnum)
 126 {
 127         int i;
 128         struct mtd_oob_ops ops;
 129         int err = 0;
 130         loff_t addr = ebnum * mtd->erasesize;
 131
 132         for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
 133                 set_random_data(writebuf, use_len);
 134                 ops.mode      = MTD_OOB_AUTO;
 135                 ops.len       = 0;
 136                 ops.retlen    = 0;
 137                 ops.ooblen    = use_len;
 138                 ops.oobretlen = 0;
 139                 ops.ooboffs   = use_offset;
 140                 ops.datbuf    = NULL;
 141                 ops.oobbuf    = writebuf;
 142                 err = mtd->write_oob(mtd, addr, &ops);
 143                 if (err || ops.oobretlen != use_len) {
 144                         printk(PRINT_PREF "error: writeoob failed at %#llx\n",
 145                                (long long)addr);
 146                         printk(PRINT_PREF "error: use_len %d, use_offset %d\n",
 147                                use_len, use_offset);
 148                         errcnt += 1;
 149                         return err ? err : -1;
 150                 }
 151                 if (vary_offset)
 152                         do_vary_offset();
 153         }
 154
 155         return err;
 156 }
 157
 158 static int write_whole_device(void)
 159 {
 160         int err;
 161         unsigned int i;
 162
 163         printk(PRINT_PREF "writing OOBs of whole device\n");
 164         for (i = 0; i < ebcnt; ++i) {
 165                 if (bbt[i])
 166                         continue;
 167                 err = write_eraseblock(i);
 168                 if (err)
 169                         return err;
 170                 if (i % 256 == 0)
 171                         printk(PRINT_PREF "written up to eraseblock %u\n", i);
 172                 cond_resched();
 173         }
 174         printk(PRINT_PREF "written %u eraseblocks\n", i);
 175         return 0;
 176 }
 177
 178 static int verify_eraseblock(int ebnum)
 179 {
 180         int i;
 181         struct mtd_oob_ops ops;
 182         int err = 0;
 183         loff_t addr = ebnum * mtd->erasesize;
 184
 185         for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
 186                 set_random_data(writebuf, use_len);
 187                 ops.mode      = MTD_OOB_AUTO;
 188                 ops.len       = 0;
 189                 ops.retlen    = 0;
 190                 ops.ooblen    = use_len;
 191                 ops.oobretlen = 0;
 192                 ops.ooboffs   = use_offset;
 193                 ops.datbuf    = NULL;
 194                 ops.oobbuf    = readbuf;
 195                 err = mtd->read_oob(mtd, addr, &ops);
 196                 if (err || ops.oobretlen != use_len) {
 197                         printk(PRINT_PREF "error: readoob failed at %#llx\n",
 198                                (long long)addr);
 199                         errcnt += 1;
 200                         return err ? err : -1;
 201                 }
 202                 if (memcmp(readbuf, writebuf, use_len)) {
 203                         printk(PRINT_PREF "error: verify failed at %#llx\n",
 204                                (long long)addr);
 205                         errcnt += 1;
 206                         if (errcnt > 1000) {
 207                                 printk(PRINT_PREF "error: too many errors\n");
 208                                 return -1;
 209                         }
 210                 }
 211                 if (use_offset != 0 || use_len < mtd->ecclayout->oobavail) {
 212                         int k;
 213
 214                         ops.mode      = MTD_OOB_AUTO;
 215                         ops.len       = 0;
 216                         ops.retlen    = 0;
 217                         ops.ooblen    = mtd->ecclayout->oobavail;
 218                         ops.oobretlen = 0;
 219                         ops.ooboffs   = 0;
 220                         ops.datbuf    = NULL;
 221                         ops.oobbuf    = readbuf;
 222                         err = mtd->read_oob(mtd, addr, &ops);
 223                         if (err || ops.oobretlen != mtd->ecclayout->oobavail) {
 224                                 printk(PRINT_PREF "error: readoob failed at "
 225                                        "%#llx\n", (long long)addr);
 226                                 errcnt += 1;
 227                                 return err ? err : -1;
 228                         }
 229                         if (memcmp(readbuf + use_offset, writebuf, use_len)) {
 230                                 printk(PRINT_PREF "error: verify failed at "
 231                                        "%#llx\n", (long long)addr);
 232                                 errcnt += 1;
 233                                 if (errcnt > 1000) {
 234                                         printk(PRINT_PREF "error: too many "
 235                                                "errors\n");
 236                                         return -1;
 237                                 }
 238                         }
 239                         for (k = 0; k < use_offset; ++k)
 240                                 if (readbuf[k] != 0xff) {
 241                                         printk(PRINT_PREF "error: verify 0xff "
 242                                                "failed at %#llx\n",
 243                                                (long long)addr);
 244                                         errcnt += 1;
 245                                         if (errcnt > 1000) {
 246                                                 printk(PRINT_PREF "error: too "
 247                                                        "many errors\n");
 248                                                 return -1;
 249                                         }
 250                                 }
 251                         for (k = use_offset + use_len;
 252                              k < mtd->ecclayout->oobavail; ++k)
 253                                 if (readbuf[k] != 0xff) {
 254                                         printk(PRINT_PREF "error: verify 0xff "
 255                                                "failed at %#llx\n",
 256                                                (long long)addr);
 257                                         errcnt += 1;
 258                                         if (errcnt > 1000) {
 259                                                 printk(PRINT_PREF "error: too "
 260                                                        "many errors\n");
 261                                                 return -1;
 262                                         }
 263                                 }
 264                 }
 265                 if (vary_offset)
 266                         do_vary_offset();
 267         }
 268         return err;
 269 }
 270
 271 static int verify_eraseblock_in_one_go(int ebnum)
 272 {
 273         struct mtd_oob_ops ops;
 274         int err = 0;
 275         loff_t addr = ebnum * mtd->erasesize;
 276         size_t len = mtd->ecclayout->oobavail * pgcnt;
 277
 278         set_random_data(writebuf, len);
 279         ops.mode      = MTD_OOB_AUTO;
 280         ops.len       = 0;
 281         ops.retlen    = 0;
 282         ops.ooblen    = len;
 283         ops.oobretlen = 0;
 284         ops.ooboffs   = 0;
 285         ops.datbuf    = NULL;
 286         ops.oobbuf    = readbuf;
 287         err = mtd->read_oob(mtd, addr, &ops);
 288         if (err || ops.oobretlen != len) {
 289                 printk(PRINT_PREF "error: readoob failed at %#llx\n",
 290                        (long long)addr);
 291                 errcnt += 1;
 292                 return err ? err : -1;
 293         }
 294         if (memcmp(readbuf, writebuf, len)) {
 295                 printk(PRINT_PREF "error: verify failed at %#llx\n",
 296                        (long long)addr);
 297                 errcnt += 1;
 298                 if (errcnt > 1000) {
 299                         printk(PRINT_PREF "error: too many errors\n");
 300                         return -1;
 301                 }
 302         }
 303
 304         return err;
 305 }
 306
 307 static int verify_all_eraseblocks(void)
 308 {
 309         int err;
 310         unsigned int i;
 311
 312         printk(PRINT_PREF "verifying all eraseblocks\n");
 313         for (i = 0; i < ebcnt; ++i) {
 314                 if (bbt[i])
 315                         continue;
 316                 err = verify_eraseblock(i);
 317                 if (err)
 318                         return err;
 319                 if (i % 256 == 0)
 320                         printk(PRINT_PREF "verified up to eraseblock %u\n", i);
 321                 cond_resched();
 322         }
 323         printk(PRINT_PREF "verified %u eraseblocks\n", i);
 324         return 0;
 325 }
 326
 327 static int is_block_bad(int ebnum)
 328 {
 329         int ret;
 330         loff_t addr = ebnum * mtd->erasesize;
 331
 332         ret = mtd->block_isbad(mtd, addr);
 333         if (ret)
 334                 printk(PRINT_PREF "block %d is bad\n", ebnum);
 335         return ret;
 336 }
 337
 338 static int scan_for_bad_eraseblocks(void)
 339 {
 340         int i, bad = 0;
 341
 342         bbt = kmalloc(ebcnt, GFP_KERNEL);
 343         if (!bbt) {
 344                 printk(PRINT_PREF "error: cannot allocate memory\n");
 345                 return -ENOMEM;
 346         }
 347
 348         printk(PRINT_PREF "scanning for bad eraseblocks\n");
 349         for (i = 0; i < ebcnt; ++i) {
 350                 bbt[i] = is_block_bad(i) ? 1 : 0;
 351                 if (bbt[i])
 352                         bad += 1;
 353                 cond_resched();
 354         }
 355         printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
 356         return 0;
 357 }
 358
 359 static int __init mtd_oobtest_init(void)
 360 {
 361         int err = 0;
 362         unsigned int i;
 363         uint64_t tmp;
 364         struct mtd_oob_ops ops;
 365         loff_t addr = 0, addr0;
 366
 367         printk(KERN_INFO "\n");
 368         printk(KERN_INFO "=================================================\n");
 369         printk(PRINT_PREF "MTD device: %d\n", dev);
 370
 371         mtd = get_mtd_device(NULL, dev);
 372         if (IS_ERR(mtd)) {
 373                 err = PTR_ERR(mtd);
 374                 printk(PRINT_PREF "error: cannot get MTD device\n");
 375                 return err;
 376         }
 377
 378         if (mtd->type != MTD_NANDFLASH) {
 379                 printk(PRINT_PREF "this test requires NAND flash\n");
 380                 goto out;
 381         }
 382
 383         tmp = mtd->size;
 384         do_div(tmp, mtd->erasesize);
 385         ebcnt = tmp;
 386         pgcnt = mtd->erasesize / mtd->writesize;
 387
 388         printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
 389                "page size %u, count of eraseblocks %u, pages per "
 390                "eraseblock %u, OOB size %u\n",
 391                (unsigned long long)mtd->size, mtd->erasesize,
 392                mtd->writesize, ebcnt, pgcnt, mtd->oobsize);
 393
 394         err = -ENOMEM;
 395         readbuf = kmalloc(mtd->erasesize, GFP_KERNEL);
 396         if (!readbuf) {
 397                 printk(PRINT_PREF "error: cannot allocate memory\n");
 398                 goto out;
 399         }
 400         writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
 401         if (!writebuf) {
 402                 printk(PRINT_PREF "error: cannot allocate memory\n");
 403                 goto out;
 404         }
 405
 406         err = scan_for_bad_eraseblocks();
 407         if (err)
 408                 goto out;
 409
 410         use_offset = 0;
 411         use_len = mtd->ecclayout->oobavail;
 412         use_len_max = mtd->ecclayout->oobavail;
 413         vary_offset = 0;
 414
 415         /* First test: write all OOB, read it back and verify */
 416         printk(PRINT_PREF "test 1 of 5\n");
 417
 418         err = erase_whole_device();
 419         if (err)
 420                 goto out;
 421
 422         simple_srand(1);
 423         err = write_whole_device();
 424         if (err)
 425                 goto out;
 426
 427         simple_srand(1);
 428         err = verify_all_eraseblocks();
 429         if (err)
 430                 goto out;
 431
 432         /*
 433          * Second test: write all OOB, a block at a time, read it back and
 434          * verify.
 435          */
 436         printk(PRINT_PREF "test 2 of 5\n");
 437
 438         err = erase_whole_device();
 439         if (err)
 440                 goto out;
 441
 442         simple_srand(3);
 443         err = write_whole_device();
 444         if (err)
 445                 goto out;
 446
 447         /* Check all eraseblocks */
 448         simple_srand(3);
 449         printk(PRINT_PREF "verifying all eraseblocks\n");
 450         for (i = 0; i < ebcnt; ++i) {
 451                 if (bbt[i])
 452                         continue;
 453                 err = verify_eraseblock_in_one_go(i);
 454                 if (err)
 455                         goto out;
 456                 if (i % 256 == 0)
 457                         printk(PRINT_PREF "verified up to eraseblock %u\n", i);
 458                 cond_resched();
 459         }
 460         printk(PRINT_PREF "verified %u eraseblocks\n", i);
 461
 462         /*
 463          * Third test: write OOB at varying offsets and lengths, read it back
 464          * and verify.
 465          */
 466         printk(PRINT_PREF "test 3 of 5\n");
 467
 468         err = erase_whole_device();
 469         if (err)
 470                 goto out;
 471
 472         /* Write all eraseblocks */
 473         use_offset = 0;
 474         use_len = mtd->ecclayout->oobavail;
 475         use_len_max = mtd->ecclayout->oobavail;
 476         vary_offset = 1;
 477         simple_srand(5);
 478
 479         err = write_whole_device();
 480         if (err)
 481                 goto out;
 482
 483         /* Check all eraseblocks */
 484         use_offset = 0;
 485         use_len = mtd->ecclayout->oobavail;
 486         use_len_max = mtd->ecclayout->oobavail;
 487         vary_offset = 1;
 488         simple_srand(5);
 489         err = verify_all_eraseblocks();
 490         if (err)
 491                 goto out;
 492
 493         use_offset = 0;
 494         use_len = mtd->ecclayout->oobavail;
 495         use_len_max = mtd->ecclayout->oobavail;
 496         vary_offset = 0;
 497
 498         /* Fourth test: try to write off end of device */
 499         printk(PRINT_PREF "test 4 of 5\n");
 500
 501         err = erase_whole_device();
 502         if (err)
 503                 goto out;
 504
 505         addr0 = 0;
 506         for (i = 0; i < ebcnt && bbt[i]; ++i)
 507                 addr0 += mtd->erasesize;
 508
 509         /* Attempt to write off end of OOB */
 510         ops.mode      = MTD_OOB_AUTO;
 511         ops.len       = 0;
 512         ops.retlen    = 0;
 513         ops.ooblen    = 1;
 514         ops.oobretlen = 0;
 515         ops.ooboffs   = mtd->ecclayout->oobavail;
 516         ops.datbuf    = NULL;
 517         ops.oobbuf    = writebuf;
 518         printk(PRINT_PREF "attempting to start write past end of OOB\n");
 519         printk(PRINT_PREF "an error is expected...\n");
 520         err = mtd->write_oob(mtd, addr0, &ops);
 521         if (err) {
 522                 printk(PRINT_PREF "error occurred as expected\n");
 523                 err = 0;
 524         } else {
 525                 printk(PRINT_PREF "error: can write past end of OOB\n");
 526                 errcnt += 1;
 527         }
 528
 529         /* Attempt to read off end of OOB */
 530         ops.mode      = MTD_OOB_AUTO;
 531         ops.len       = 0;
 532         ops.retlen    = 0;
 533         ops.ooblen    = 1;
 534         ops.oobretlen = 0;
 535         ops.ooboffs   = mtd->ecclayout->oobavail;
 536         ops.datbuf    = NULL;
 537         ops.oobbuf    = readbuf;
 538         printk(PRINT_PREF "attempting to start read past end of OOB\n");
 539         printk(PRINT_PREF "an error is expected...\n");
 540         err = mtd->read_oob(mtd, addr0, &ops);
 541         if (err) {
 542                 printk(PRINT_PREF "error occurred as expected\n");
 543                 err = 0;
 544         } else {
 545                 printk(PRINT_PREF "error: can read past end of OOB\n");
 546                 errcnt += 1;
 547         }
 548
 549         if (bbt[ebcnt - 1])
 550                 printk(PRINT_PREF "skipping end of device tests because last "
 551                        "block is bad\n");
 552         else {
 553                 /* Attempt to write off end of device */
 554                 ops.mode      = MTD_OOB_AUTO;
 555                 ops.len       = 0;
 556                 ops.retlen    = 0;
 557                 ops.ooblen    = mtd->ecclayout->oobavail + 1;
 558                 ops.oobretlen = 0;
 559                 ops.ooboffs   = 0;
 560                 ops.datbuf    = NULL;
 561                 ops.oobbuf    = writebuf;
 562                 printk(PRINT_PREF "attempting to write past end of device\n");
 563                 printk(PRINT_PREF "an error is expected...\n");
 564                 err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops);
 565                 if (err) {
 566                         printk(PRINT_PREF "error occurred as expected\n");
 567                         err = 0;
 568                 } else {
 569                         printk(PRINT_PREF "error: wrote past end of device\n");
 570                         errcnt += 1;
 571                 }
 572
 573                 /* Attempt to read off end of device */
 574                 ops.mode      = MTD_OOB_AUTO;
 575                 ops.len       = 0;
 576                 ops.retlen    = 0;
 577                 ops.ooblen    = mtd->ecclayout->oobavail + 1;
 578                 ops.oobretlen = 0;
 579                 ops.ooboffs   = 0;
 580                 ops.datbuf    = NULL;
 581                 ops.oobbuf    = readbuf;
 582                 printk(PRINT_PREF "attempting to read past end of device\n");
 583                 printk(PRINT_PREF "an error is expected...\n");
 584                 err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops);
 585                 if (err) {
 586                         printk(PRINT_PREF "error occurred as expected\n");
 587                         err = 0;
 588                 } else {
 589                         printk(PRINT_PREF "error: read past end of device\n");
 590                         errcnt += 1;
 591                 }
 592
 593                 err = erase_eraseblock(ebcnt - 1);
 594                 if (err)
 595                         goto out;
 596
 597                 /* Attempt to write off end of device */
 598                 ops.mode      = MTD_OOB_AUTO;
 599                 ops.len       = 0;
 600                 ops.retlen    = 0;
 601                 ops.ooblen    = mtd->ecclayout->oobavail;
 602                 ops.oobretlen = 0;
 603                 ops.ooboffs   = 1;
 604                 ops.datbuf    = NULL;
 605                 ops.oobbuf    = writebuf;
 606                 printk(PRINT_PREF "attempting to write past end of device\n");
 607                 printk(PRINT_PREF "an error is expected...\n");
 608                 err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops);
 609                 if (err) {
 610                         printk(PRINT_PREF "error occurred as expected\n");
 611                         err = 0;
 612                 } else {
 613                         printk(PRINT_PREF "error: wrote past end of device\n");
 614                         errcnt += 1;
 615                 }
 616
 617                 /* Attempt to read off end of device */
 618                 ops.mode      = MTD_OOB_AUTO;
 619                 ops.len       = 0;
 620                 ops.retlen    = 0;
 621                 ops.ooblen    = mtd->ecclayout->oobavail;
 622                 ops.oobretlen = 0;
 623                 ops.ooboffs   = 1;
 624                 ops.datbuf    = NULL;
 625                 ops.oobbuf    = readbuf;
 626                 printk(PRINT_PREF "attempting to read past end of device\n");
 627                 printk(PRINT_PREF "an error is expected...\n");
 628                 err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops);
 629                 if (err) {
 630                         printk(PRINT_PREF "error occurred as expected\n");
 631                         err = 0;
 632                 } else {
 633                         printk(PRINT_PREF "error: read past end of device\n");
 634                         errcnt += 1;
 635                 }
 636         }
 637
 638         /* Fifth test: write / read across block boundaries */
 639         printk(PRINT_PREF "test 5 of 5\n");
 640
 641         /* Erase all eraseblocks */
 642         err = erase_whole_device();
 643         if (err)
 644                 goto out;
 645
 646         /* Write all eraseblocks */
 647         simple_srand(11);
 648         printk(PRINT_PREF "writing OOBs of whole device\n");
 649         for (i = 0; i < ebcnt - 1; ++i) {
 650                 int cnt = 2;
 651                 int pg;
 652                 size_t sz = mtd->ecclayout->oobavail;
 653                 if (bbt[i] || bbt[i + 1])
 654                         continue;
 655                 addr = (i + 1) * mtd->erasesize - mtd->writesize;
 656                 for (pg = 0; pg < cnt; ++pg) {
 657                         set_random_data(writebuf, sz);
 658                         ops.mode      = MTD_OOB_AUTO;
 659                         ops.len       = 0;
 660                         ops.retlen    = 0;
 661                         ops.ooblen    = sz;
 662                         ops.oobretlen = 0;
 663                         ops.ooboffs   = 0;
 664                         ops.datbuf    = NULL;
 665                         ops.oobbuf    = writebuf;
 666                         err = mtd->write_oob(mtd, addr, &ops);
 667                         if (err)
 668                                 goto out;
 669                         if (i % 256 == 0)
 670                                 printk(PRINT_PREF "written up to eraseblock "
 671                                        "%u\n", i);
 672                         cond_resched();
 673                         addr += mtd->writesize;
 674                 }
 675         }
 676         printk(PRINT_PREF "written %u eraseblocks\n", i);
 677
 678         /* Check all eraseblocks */
 679         simple_srand(11);
 680         printk(PRINT_PREF "verifying all eraseblocks\n");
 681         for (i = 0; i < ebcnt - 1; ++i) {
 682                 if (bbt[i] || bbt[i + 1])
 683                         continue;
 684                 set_random_data(writebuf, mtd->ecclayout->oobavail * 2);
 685                 addr = (i + 1) * mtd->erasesize - mtd->writesize;
 686                 ops.mode      = MTD_OOB_AUTO;
 687                 ops.len       = 0;
 688                 ops.retlen    = 0;
 689                 ops.ooblen    = mtd->ecclayout->oobavail * 2;
 690                 ops.oobretlen = 0;
 691                 ops.ooboffs   = 0;
 692                 ops.datbuf    = NULL;
 693                 ops.oobbuf    = readbuf;
 694                 err = mtd->read_oob(mtd, addr, &ops);
 695                 if (err)
 696                         goto out;
 697                 if (memcmp(readbuf, writebuf, mtd->ecclayout->oobavail * 2)) {
 698                         printk(PRINT_PREF "error: verify failed at %#llx\n",
 699                                (long long)addr);
 700                         errcnt += 1;
 701                         if (errcnt > 1000) {
 702                                 printk(PRINT_PREF "error: too many errors\n");
 703                                 goto out;
 704                         }
 705                 }
 706                 if (i % 256 == 0)
 707                         printk(PRINT_PREF "verified up to eraseblock %u\n", i);
 708                 cond_resched();
 709         }
 710         printk(PRINT_PREF "verified %u eraseblocks\n", i);
 711
 712         printk(PRINT_PREF "finished with %d errors\n", errcnt);
 713 out:
 714         kfree(bbt);
 715         kfree(writebuf);
 716         kfree(readbuf);
 717         put_mtd_device(mtd);
 718         if (err)
 719                 printk(PRINT_PREF "error %d occurred\n", err);
 720         printk(KERN_INFO "=================================================\n");
 721         return err;
 722 }
 723 module_init(mtd_oobtest_init);
 724
 725 static void __exit mtd_oobtest_exit(void)
 726 {
 727         return;
 728 }
 729 module_exit(mtd_oobtest_exit);
 730
 731 MODULE_DESCRIPTION("Out-of-band test module");
 732 MODULE_AUTHOR("Adrian Hunter");
 733 MODULE_LICENSE("GPL");