drivers/mtd/tests/mtd_torturetest.c

   1 /*
   2  * Copyright (C) 2006-2008 Artem Bityutskiy
   3  * Copyright (C) 2006-2008 Jarkko Lavinen
   4  * Copyright (C) 2006-2008 Adrian Hunter
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; see the file COPYING. If not, write to the Free Software
  17  * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  *
  19  * Authors: Artem Bityutskiy, Jarkko Lavinen, Adria Hunter
  20  *
  21  * WARNING: this test program may kill your flash and your device. Do not
  22  * use it unless you know what you do. Authors are not responsible for any
  23  * damage caused by this program.
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/module.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/err.h>
  30 #include <linux/mtd/mtd.h>
  31 #include <linux/slab.h>
  32 #include <linux/sched.h>
  33
  34 #define PRINT_PREF KERN_INFO "mtd_torturetest: "
  35 #define RETRIES 3
  36
  37 static int eb = 8;
  38 module_param(eb, int, S_IRUGO);
  39 MODULE_PARM_DESC(eb, "eraseblock number within the selected MTD device");
  40
  41 static int ebcnt = 32;
  42 module_param(ebcnt, int, S_IRUGO);
  43 MODULE_PARM_DESC(ebcnt, "number of consecutive eraseblocks to torture");
  44
  45 static int pgcnt;
  46 module_param(pgcnt, int, S_IRUGO);
  47 MODULE_PARM_DESC(pgcnt, "number of pages per eraseblock to torture (0 => all)");
  48
  49 static int dev;
  50 module_param(dev, int, S_IRUGO);
  51 MODULE_PARM_DESC(dev, "MTD device number to use");
  52
  53 static int gran = 512;
  54 module_param(gran, int, S_IRUGO);
  55 MODULE_PARM_DESC(gran, "how often the status information should be printed");
  56
  57 static int check = 1;
  58 module_param(check, int, S_IRUGO);
  59 MODULE_PARM_DESC(check, "if the written data should be checked");
  60
  61 static unsigned int cycles_count;
  62 module_param(cycles_count, uint, S_IRUGO);
  63 MODULE_PARM_DESC(cycles_count, "how many erase cycles to do "
  64                                "(infinite by default)");
  65
  66 static struct mtd_info *mtd;
  67
  68 /* This buffer contains 0x555555...0xAAAAAA... pattern */
  69 static unsigned char *patt_5A5;
  70 /* This buffer contains 0xAAAAAA...0x555555... pattern */
  71 static unsigned char *patt_A5A;
  72 /* This buffer contains all 0xFF bytes */
  73 static unsigned char *patt_FF;
  74 /* This a temporary buffer is use when checking data */
  75 static unsigned char *check_buf;
  76 /* How many erase cycles were done */
  77 static unsigned int erase_cycles;
  78
  79 static int pgsize;
  80 static struct timeval start, finish;
  81
  82 static void report_corrupt(unsigned char *read, unsigned char *written);
  83
  84 static inline void start_timing(void)
  85 {
  86         do_gettimeofday(&start);
  87 }
  88
  89 static inline void stop_timing(void)
  90 {
  91         do_gettimeofday(&finish);
  92 }
  93
  94 /*
  95  * Erase eraseblock number @ebnum.
  96  */
  97 static inline int erase_eraseblock(int ebnum)
  98 {
  99         int err;
 100         struct erase_info ei;
 101         loff_t addr = ebnum * mtd->erasesize;
 102
 103         memset(&ei, 0, sizeof(struct erase_info));
 104         ei.mtd  = mtd;
 105         ei.addr = addr;
 106         ei.len  = mtd->erasesize;
 107
 108         err = mtd->erase(mtd, &ei);
 109         if (err) {
 110                 printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
 111                 return err;
 112         }
 113
 114         if (ei.state == MTD_ERASE_FAILED) {
 115                 printk(PRINT_PREF "some erase error occurred at EB %d\n",
 116                        ebnum);
 117                 return -EIO;
 118         }
 119
 120         return 0;
 121 }
 122
 123 /*
 124  * Check that the contents of eraseblock number @enbum is equivalent to the
 125  * @buf buffer.
 126  */
 127 static inline int check_eraseblock(int ebnum, unsigned char *buf)
 128 {
 129         int err, retries = 0;
 130         size_t read = 0;
 131         loff_t addr = ebnum * mtd->erasesize;
 132         size_t len = mtd->erasesize;
 133
 134         if (pgcnt) {
 135                 addr = (ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
 136                 len = pgcnt * pgsize;
 137         }
 138
 139 retry:
 140         err = mtd->read(mtd, addr, len, &read, check_buf);
 141         if (mtd_is_bitflip(err))
 142                 printk(PRINT_PREF "single bit flip occurred at EB %d "
 143                        "MTD reported that it was fixed.\n", ebnum);
 144         else if (err) {
 145                 printk(PRINT_PREF "error %d while reading EB %d, "
 146                        "read %zd\n", err, ebnum, read);
 147                 return err;
 148         }
 149
 150         if (read != len) {
 151                 printk(PRINT_PREF "failed to read %zd bytes from EB %d, "
 152                        "read only %zd, but no error reported\n",
 153                        len, ebnum, read);
 154                 return -EIO;
 155         }
 156
 157         if (memcmp(buf, check_buf, len)) {
 158                 printk(PRINT_PREF "read wrong data from EB %d\n", ebnum);
 159                 report_corrupt(check_buf, buf);
 160
 161                 if (retries++ < RETRIES) {
 162                         /* Try read again */
 163                         yield();
 164                         printk(PRINT_PREF "re-try reading data from EB %d\n",
 165                                ebnum);
 166                         goto retry;
 167                 } else {
 168                         printk(PRINT_PREF "retried %d times, still errors, "
 169                                "give-up\n", RETRIES);
 170                         return -EINVAL;
 171                 }
 172         }
 173
 174         if (retries != 0)
 175                 printk(PRINT_PREF "only attempt number %d was OK (!!!)\n",
 176                        retries);
 177
 178         return 0;
 179 }
 180
 181 static inline int write_pattern(int ebnum, void *buf)
 182 {
 183         int err;
 184         size_t written = 0;
 185         loff_t addr = ebnum * mtd->erasesize;
 186         size_t len = mtd->erasesize;
 187
 188         if (pgcnt) {
 189                 addr = (ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
 190                 len = pgcnt * pgsize;
 191         }
 192         err = mtd->write(mtd, addr, len, &written, buf);
 193         if (err) {
 194                 printk(PRINT_PREF "error %d while writing EB %d, written %zd"
 195                       " bytes\n", err, ebnum, written);
 196                 return err;
 197         }
 198         if (written != len) {
 199                 printk(PRINT_PREF "written only %zd bytes of %zd, but no error"
 200                        " reported\n", written, len);
 201                 return -EIO;
 202         }
 203
 204         return 0;
 205 }
 206
 207 static int __init tort_init(void)
 208 {
 209         int err = 0, i, infinite = !cycles_count;
 210         int bad_ebs[ebcnt];
 211
 212         printk(KERN_INFO "\n");
 213         printk(KERN_INFO "=================================================\n");
 214         printk(PRINT_PREF "Warning: this program is trying to wear out your "
 215                "flash, stop it if this is not wanted.\n");
 216         printk(PRINT_PREF "MTD device: %d\n", dev);
 217         printk(PRINT_PREF "torture %d eraseblocks (%d-%d) of mtd%d\n",
 218                ebcnt, eb, eb + ebcnt - 1, dev);
 219         if (pgcnt)
 220                 printk(PRINT_PREF "torturing just %d pages per eraseblock\n",
 221                         pgcnt);
 222         printk(PRINT_PREF "write verify %s\n", check ? "enabled" : "disabled");
 223
 224         mtd = get_mtd_device(NULL, dev);
 225         if (IS_ERR(mtd)) {
 226                 err = PTR_ERR(mtd);
 227                 printk(PRINT_PREF "error: cannot get MTD device\n");
 228                 return err;
 229         }
 230
 231         if (mtd->writesize == 1) {
 232                 printk(PRINT_PREF "not NAND flash, assume page size is 512 "
 233                        "bytes.\n");
 234                 pgsize = 512;
 235         } else
 236                 pgsize = mtd->writesize;
 237
 238         if (pgcnt && (pgcnt > mtd->erasesize / pgsize || pgcnt < 0)) {
 239                 printk(PRINT_PREF "error: invalid pgcnt value %d\n", pgcnt);
 240                 goto out_mtd;
 241         }
 242
 243         err = -ENOMEM;
 244         patt_5A5 = kmalloc(mtd->erasesize, GFP_KERNEL);
 245         if (!patt_5A5) {
 246                 printk(PRINT_PREF "error: cannot allocate memory\n");
 247                 goto out_mtd;
 248         }
 249
 250         patt_A5A = kmalloc(mtd->erasesize, GFP_KERNEL);
 251         if (!patt_A5A) {
 252                 printk(PRINT_PREF "error: cannot allocate memory\n");
 253                 goto out_patt_5A5;
 254         }
 255
 256         patt_FF = kmalloc(mtd->erasesize, GFP_KERNEL);
 257         if (!patt_FF) {
 258                 printk(PRINT_PREF "error: cannot allocate memory\n");
 259                 goto out_patt_A5A;
 260         }
 261
 262         check_buf = kmalloc(mtd->erasesize, GFP_KERNEL);
 263         if (!check_buf) {
 264                 printk(PRINT_PREF "error: cannot allocate memory\n");
 265                 goto out_patt_FF;
 266         }
 267
 268         err = 0;
 269
 270         /* Initialize patterns */
 271         memset(patt_FF, 0xFF, mtd->erasesize);
 272         for (i = 0; i < mtd->erasesize / pgsize; i++) {
 273                 if (!(i & 1)) {
 274                         memset(patt_5A5 + i * pgsize, 0x55, pgsize);
 275                         memset(patt_A5A + i * pgsize, 0xAA, pgsize);
 276                 } else {
 277                         memset(patt_5A5 + i * pgsize, 0xAA, pgsize);
 278                         memset(patt_A5A + i * pgsize, 0x55, pgsize);
 279                 }
 280         }
 281
 282         /*
 283          * Check if there is a bad eraseblock among those we are going to test.
 284          */
 285         memset(&bad_ebs[0], 0, sizeof(int) * ebcnt);
 286         if (mtd->block_isbad) {
 287                 for (i = eb; i < eb + ebcnt; i++) {
 288                         err = mtd->block_isbad(mtd,
 289                                                (loff_t)i * mtd->erasesize);
 290
 291                         if (err < 0) {
 292                                 printk(PRINT_PREF "block_isbad() returned %d "
 293                                        "for EB %d\n", err, i);
 294                                 goto out;
 295                         }
 296
 297                         if (err) {
 298                                 printk("EB %d is bad. Skip it.\n", i);
 299                                 bad_ebs[i - eb] = 1;
 300                         }
 301                 }
 302         }
 303
 304         start_timing();
 305         while (1) {
 306                 int i;
 307                 void *patt;
 308
 309                 /* Erase all eraseblocks */
 310                 for (i = eb; i < eb + ebcnt; i++) {
 311                         if (bad_ebs[i - eb])
 312                                 continue;
 313                         err = erase_eraseblock(i);
 314                         if (err)
 315                                 goto out;
 316                         cond_resched();
 317                 }
 318
 319                 /* Check if the eraseblocks contain only 0xFF bytes */
 320                 if (check) {
 321                         for (i = eb; i < eb + ebcnt; i++) {
 322                                 if (bad_ebs[i - eb])
 323                                         continue;
 324                                 err = check_eraseblock(i, patt_FF);
 325                                 if (err) {
 326                                         printk(PRINT_PREF "verify failed"
 327                                                " for 0xFF... pattern\n");
 328                                         goto out;
 329                                 }
 330                                 cond_resched();
 331                         }
 332                 }
 333
 334                 /* Write the pattern */
 335                 for (i = eb; i < eb + ebcnt; i++) {
 336                         if (bad_ebs[i - eb])
 337                                 continue;
 338                         if ((eb + erase_cycles) & 1)
 339                                 patt = patt_5A5;
 340                         else
 341                                 patt = patt_A5A;
 342                         err = write_pattern(i, patt);
 343                         if (err)
 344                                 goto out;
 345                         cond_resched();
 346                 }
 347
 348                 /* Verify what we wrote */
 349                 if (check) {
 350                         for (i = eb; i < eb + ebcnt; i++) {
 351                                 if (bad_ebs[i - eb])
 352                                         continue;
 353                                 if ((eb + erase_cycles) & 1)
 354                                         patt = patt_5A5;
 355                                 else
 356                                         patt = patt_A5A;
 357                                 err = check_eraseblock(i, patt);
 358                                 if (err) {
 359                                         printk(PRINT_PREF "verify failed for %s"
 360                                                " pattern\n",
 361                                                ((eb + erase_cycles) & 1) ?
 362                                                "0x55AA55..." : "0xAA55AA...");
 363                                         goto out;
 364                                 }
 365                                 cond_resched();
 366                         }
 367                 }
 368
 369                 erase_cycles += 1;
 370
 371                 if (erase_cycles % gran == 0) {
 372                         long ms;
 373
 374                         stop_timing();
 375                         ms = (finish.tv_sec - start.tv_sec) * 1000 +
 376                              (finish.tv_usec - start.tv_usec) / 1000;
 377                         printk(PRINT_PREF "%08u erase cycles done, took %lu "
 378                                "milliseconds (%lu seconds)\n",
 379                                erase_cycles, ms, ms / 1000);
 380                         start_timing();
 381                 }
 382
 383                 if (!infinite && --cycles_count == 0)
 384                         break;
 385         }
 386 out:
 387
 388         printk(PRINT_PREF "finished after %u erase cycles\n",
 389                erase_cycles);
 390         kfree(check_buf);
 391 out_patt_FF:
 392         kfree(patt_FF);
 393 out_patt_A5A:
 394         kfree(patt_A5A);
 395 out_patt_5A5:
 396         kfree(patt_5A5);
 397 out_mtd:
 398         put_mtd_device(mtd);
 399         if (err)
 400                 printk(PRINT_PREF "error %d occurred during torturing\n", err);
 401         printk(KERN_INFO "=================================================\n");
 402         return err;
 403 }
 404 module_init(tort_init);
 405
 406 static void __exit tort_exit(void)
 407 {
 408         return;
 409 }
 410 module_exit(tort_exit);
 411
 412 static int countdiffs(unsigned char *buf, unsigned char *check_buf,
 413                       unsigned offset, unsigned len, unsigned *bytesp,
 414                       unsigned *bitsp);
 415 static void print_bufs(unsigned char *read, unsigned char *written, int start,
 416                        int len);
 417
 418 /*
 419  * Report the detailed information about how the read EB differs from what was
 420  * written.
 421  */
 422 static void report_corrupt(unsigned char *read, unsigned char *written)
 423 {
 424         int i;
 425         int bytes, bits, pages, first;
 426         int offset, len;
 427         size_t check_len = mtd->erasesize;
 428
 429         if (pgcnt)
 430                 check_len = pgcnt * pgsize;
 431
 432         bytes = bits = pages = 0;
 433         for (i = 0; i < check_len; i += pgsize)
 434                 if (countdiffs(written, read, i, pgsize, &bytes,
 435                                &bits) >= 0)
 436                         pages++;
 437
 438         printk(PRINT_PREF "verify fails on %d pages, %d bytes/%d bits\n",
 439                pages, bytes, bits);
 440         printk(PRINT_PREF "The following is a list of all differences between"
 441                " what was read from flash and what was expected\n");
 442
 443         for (i = 0; i < check_len; i += pgsize) {
 444                 cond_resched();
 445                 bytes = bits = 0;
 446                 first = countdiffs(written, read, i, pgsize, &bytes,
 447                                    &bits);
 448                 if (first < 0)
 449                         continue;
 450
 451                 printk("-------------------------------------------------------"
 452                        "----------------------------------\n");
 453
 454                 printk(PRINT_PREF "Page %zd has %d bytes/%d bits failing verify,"
 455                        " starting at offset 0x%x\n",
 456                        (mtd->erasesize - check_len + i) / pgsize,
 457                        bytes, bits, first);
 458
 459                 offset = first & ~0x7;
 460                 len = ((first + bytes) | 0x7) + 1 - offset;
 461
 462                 print_bufs(read, written, offset, len);
 463         }
 464 }
 465
 466 static void print_bufs(unsigned char *read, unsigned char *written, int start,
 467                        int len)
 468 {
 469         int i = 0, j1, j2;
 470         char *diff;
 471
 472         printk("Offset       Read                          Written\n");
 473         while (i < len) {
 474                 printk("0x%08x: ", start + i);
 475                 diff = "   ";
 476                 for (j1 = 0; j1 < 8 && i + j1 < len; j1++) {
 477                         printk(" %02x", read[start + i + j1]);
 478                         if (read[start + i + j1] != written[start + i + j1])
 479                                 diff = "***";
 480                 }
 481
 482                 while (j1 < 8) {
 483                         printk(" ");
 484                         j1 += 1;
 485                 }
 486
 487                 printk("  %s ", diff);
 488
 489                 for (j2 = 0; j2 < 8 && i + j2 < len; j2++)
 490                         printk(" %02x", written[start + i + j2]);
 491                 printk("\n");
 492                 i += 8;
 493         }
 494 }
 495
 496 /*
 497  * Count the number of differing bytes and bits and return the first differing
 498  * offset.
 499  */
 500 static int countdiffs(unsigned char *buf, unsigned char *check_buf,
 501                       unsigned offset, unsigned len, unsigned *bytesp,
 502                       unsigned *bitsp)
 503 {
 504         unsigned i, bit;
 505         int first = -1;
 506
 507         for (i = offset; i < offset + len; i++)
 508                 if (buf[i] != check_buf[i]) {
 509                         first = i;
 510                         break;
 511                 }
 512
 513         while (i < offset + len) {
 514                 if (buf[i] != check_buf[i]) {
 515                         (*bytesp)++;
 516                         bit = 1;
 517                         while (bit < 256) {
 518                                 if ((buf[i] & bit) != (check_buf[i] & bit))
 519                                         (*bitsp)++;
 520                                 bit <<= 1;
 521                         }
 522                 }
 523                 i++;
 524         }
 525
 526         return first;
 527 }
 528
 529 MODULE_DESCRIPTION("Eraseblock torturing module");
 530 MODULE_AUTHOR("Artem Bityutskiy, Jarkko Lavinen, Adrian Hunter");
 531 MODULE_LICENSE("GPL");