drivers/mtd/tests/mtd_speedtest.c

   1 /*
   2  * Copyright (C) 2007 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 read and write speed of a MTD device.
  18  *
  19  * Author: Adrian Hunter <adrian.hunter@nokia.com>
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/err.h>
  26 #include <linux/mtd/mtd.h>
  27 #include <linux/slab.h>
  28 #include <linux/sched.h>
  29
  30 #define PRINT_PREF KERN_INFO "mtd_speedtest: "
  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 int count;
  37 module_param(count, int, S_IRUGO);
  38 MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
  39                         "(0 means use all)");
  40
  41 static struct mtd_info *mtd;
  42 static unsigned char *iobuf;
  43 static unsigned char *bbt;
  44
  45 static int pgsize;
  46 static int ebcnt;
  47 static int pgcnt;
  48 static int goodebcnt;
  49 static struct timeval start, finish;
  50 static unsigned long next = 1;
  51
  52 static inline unsigned int simple_rand(void)
  53 {
  54         next = next * 1103515245 + 12345;
  55         return (unsigned int)((next / 65536) % 32768);
  56 }
  57
  58 static inline void simple_srand(unsigned long seed)
  59 {
  60         next = seed;
  61 }
  62
  63 static void set_random_data(unsigned char *buf, size_t len)
  64 {
  65         size_t i;
  66
  67         for (i = 0; i < len; ++i)
  68                 buf[i] = simple_rand();
  69 }
  70
  71 static int erase_eraseblock(int ebnum)
  72 {
  73         int err;
  74         struct erase_info ei;
  75         loff_t addr = ebnum * mtd->erasesize;
  76
  77         memset(&ei, 0, sizeof(struct erase_info));
  78         ei.mtd  = mtd;
  79         ei.addr = addr;
  80         ei.len  = mtd->erasesize;
  81
  82         err = mtd->erase(mtd, &ei);
  83         if (err) {
  84                 printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
  85                 return err;
  86         }
  87
  88         if (ei.state == MTD_ERASE_FAILED) {
  89                 printk(PRINT_PREF "some erase error occurred at EB %d\n",
  90                        ebnum);
  91                 return -EIO;
  92         }
  93
  94         return 0;
  95 }
  96
  97 static int multiblock_erase(int ebnum, int blocks)
  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 * blocks;
 107
 108         err = mtd->erase(mtd, &ei);
 109         if (err) {
 110                 printk(PRINT_PREF "error %d while erasing EB %d, blocks %d\n",
 111                        err, ebnum, blocks);
 112                 return err;
 113         }
 114
 115         if (ei.state == MTD_ERASE_FAILED) {
 116                 printk(PRINT_PREF "some erase error occurred at EB %d,"
 117                        "blocks %d\n", ebnum, blocks);
 118                 return -EIO;
 119         }
 120
 121         return 0;
 122 }
 123
 124 static int erase_whole_device(void)
 125 {
 126         int err;
 127         unsigned int i;
 128
 129         for (i = 0; i < ebcnt; ++i) {
 130                 if (bbt[i])
 131                         continue;
 132                 err = erase_eraseblock(i);
 133                 if (err)
 134                         return err;
 135                 cond_resched();
 136         }
 137         return 0;
 138 }
 139
 140 static int write_eraseblock(int ebnum)
 141 {
 142         size_t written = 0;
 143         int err = 0;
 144         loff_t addr = ebnum * mtd->erasesize;
 145
 146         err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
 147         if (err || written != mtd->erasesize) {
 148                 printk(PRINT_PREF "error: write failed at %#llx\n", addr);
 149                 if (!err)
 150                         err = -EINVAL;
 151         }
 152
 153         return err;
 154 }
 155
 156 static int write_eraseblock_by_page(int ebnum)
 157 {
 158         size_t written = 0;
 159         int i, err = 0;
 160         loff_t addr = ebnum * mtd->erasesize;
 161         void *buf = iobuf;
 162
 163         for (i = 0; i < pgcnt; i++) {
 164                 err = mtd->write(mtd, addr, pgsize, &written, buf);
 165                 if (err || written != pgsize) {
 166                         printk(PRINT_PREF "error: write failed at %#llx\n",
 167                                addr);
 168                         if (!err)
 169                                 err = -EINVAL;
 170                         break;
 171                 }
 172                 addr += pgsize;
 173                 buf += pgsize;
 174         }
 175
 176         return err;
 177 }
 178
 179 static int write_eraseblock_by_2pages(int ebnum)
 180 {
 181         size_t written = 0, sz = pgsize * 2;
 182         int i, n = pgcnt / 2, err = 0;
 183         loff_t addr = ebnum * mtd->erasesize;
 184         void *buf = iobuf;
 185
 186         for (i = 0; i < n; i++) {
 187                 err = mtd->write(mtd, addr, sz, &written, buf);
 188                 if (err || written != sz) {
 189                         printk(PRINT_PREF "error: write failed at %#llx\n",
 190                                addr);
 191                         if (!err)
 192                                 err = -EINVAL;
 193                         return err;
 194                 }
 195                 addr += sz;
 196                 buf += sz;
 197         }
 198         if (pgcnt % 2) {
 199                 err = mtd->write(mtd, addr, pgsize, &written, buf);
 200                 if (err || written != pgsize) {
 201                         printk(PRINT_PREF "error: write failed at %#llx\n",
 202                                addr);
 203                         if (!err)
 204                                 err = -EINVAL;
 205                 }
 206         }
 207
 208         return err;
 209 }
 210
 211 static int read_eraseblock(int ebnum)
 212 {
 213         size_t read = 0;
 214         int err = 0;
 215         loff_t addr = ebnum * mtd->erasesize;
 216
 217         err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
 218         /* Ignore corrected ECC errors */
 219         if (mtd_is_bitflip(err))
 220                 err = 0;
 221         if (err || read != mtd->erasesize) {
 222                 printk(PRINT_PREF "error: read failed at %#llx\n", addr);
 223                 if (!err)
 224                         err = -EINVAL;
 225         }
 226
 227         return err;
 228 }
 229
 230 static int read_eraseblock_by_page(int ebnum)
 231 {
 232         size_t read = 0;
 233         int i, err = 0;
 234         loff_t addr = ebnum * mtd->erasesize;
 235         void *buf = iobuf;
 236
 237         for (i = 0; i < pgcnt; i++) {
 238                 err = mtd->read(mtd, addr, pgsize, &read, buf);
 239                 /* Ignore corrected ECC errors */
 240                 if (mtd_is_bitflip(err))
 241                         err = 0;
 242                 if (err || read != pgsize) {
 243                         printk(PRINT_PREF "error: read failed at %#llx\n",
 244                                addr);
 245                         if (!err)
 246                                 err = -EINVAL;
 247                         break;
 248                 }
 249                 addr += pgsize;
 250                 buf += pgsize;
 251         }
 252
 253         return err;
 254 }
 255
 256 static int read_eraseblock_by_2pages(int ebnum)
 257 {
 258         size_t read = 0, sz = pgsize * 2;
 259         int i, n = pgcnt / 2, err = 0;
 260         loff_t addr = ebnum * mtd->erasesize;
 261         void *buf = iobuf;
 262
 263         for (i = 0; i < n; i++) {
 264                 err = mtd->read(mtd, addr, sz, &read, buf);
 265                 /* Ignore corrected ECC errors */
 266                 if (mtd_is_bitflip(err))
 267                         err = 0;
 268                 if (err || read != sz) {
 269                         printk(PRINT_PREF "error: read failed at %#llx\n",
 270                                addr);
 271                         if (!err)
 272                                 err = -EINVAL;
 273                         return err;
 274                 }
 275                 addr += sz;
 276                 buf += sz;
 277         }
 278         if (pgcnt % 2) {
 279                 err = mtd->read(mtd, addr, pgsize, &read, buf);
 280                 /* Ignore corrected ECC errors */
 281                 if (mtd_is_bitflip(err))
 282                         err = 0;
 283                 if (err || read != pgsize) {
 284                         printk(PRINT_PREF "error: read failed at %#llx\n",
 285                                addr);
 286                         if (!err)
 287                                 err = -EINVAL;
 288                 }
 289         }
 290
 291         return err;
 292 }
 293
 294 static int is_block_bad(int ebnum)
 295 {
 296         loff_t addr = ebnum * mtd->erasesize;
 297         int ret;
 298
 299         ret = mtd->block_isbad(mtd, addr);
 300         if (ret)
 301                 printk(PRINT_PREF "block %d is bad\n", ebnum);
 302         return ret;
 303 }
 304
 305 static inline void start_timing(void)
 306 {
 307         do_gettimeofday(&start);
 308 }
 309
 310 static inline void stop_timing(void)
 311 {
 312         do_gettimeofday(&finish);
 313 }
 314
 315 static long calc_speed(void)
 316 {
 317         uint64_t k;
 318         long ms;
 319
 320         ms = (finish.tv_sec - start.tv_sec) * 1000 +
 321              (finish.tv_usec - start.tv_usec) / 1000;
 322         if (ms == 0)
 323                 return 0;
 324         k = goodebcnt * (mtd->erasesize / 1024) * 1000;
 325         do_div(k, ms);
 326         return k;
 327 }
 328
 329 static int scan_for_bad_eraseblocks(void)
 330 {
 331         int i, bad = 0;
 332
 333         bbt = kzalloc(ebcnt, GFP_KERNEL);
 334         if (!bbt) {
 335                 printk(PRINT_PREF "error: cannot allocate memory\n");
 336                 return -ENOMEM;
 337         }
 338
 339         /* NOR flash does not implement block_isbad */
 340         if (mtd->block_isbad == NULL)
 341                 goto out;
 342
 343         printk(PRINT_PREF "scanning for bad eraseblocks\n");
 344         for (i = 0; i < ebcnt; ++i) {
 345                 bbt[i] = is_block_bad(i) ? 1 : 0;
 346                 if (bbt[i])
 347                         bad += 1;
 348                 cond_resched();
 349         }
 350         printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
 351 out:
 352         goodebcnt = ebcnt - bad;
 353         return 0;
 354 }
 355
 356 static int __init mtd_speedtest_init(void)
 357 {
 358         int err, i, blocks, j, k;
 359         long speed;
 360         uint64_t tmp;
 361
 362         printk(KERN_INFO "\n");
 363         printk(KERN_INFO "=================================================\n");
 364         if (count)
 365                 printk(PRINT_PREF "MTD device: %d    count: %d\n", dev, count);
 366         else
 367                 printk(PRINT_PREF "MTD device: %d\n", dev);
 368
 369         mtd = get_mtd_device(NULL, dev);
 370         if (IS_ERR(mtd)) {
 371                 err = PTR_ERR(mtd);
 372                 printk(PRINT_PREF "error: cannot get MTD device\n");
 373                 return err;
 374         }
 375
 376         if (mtd->writesize == 1) {
 377                 printk(PRINT_PREF "not NAND flash, assume page size is 512 "
 378                        "bytes.\n");
 379                 pgsize = 512;
 380         } else
 381                 pgsize = mtd->writesize;
 382
 383         tmp = mtd->size;
 384         do_div(tmp, mtd->erasesize);
 385         ebcnt = tmp;
 386         pgcnt = mtd->erasesize / pgsize;
 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                pgsize, ebcnt, pgcnt, mtd->oobsize);
 393
 394         if (count > 0 && count < ebcnt)
 395                 ebcnt = count;
 396
 397         err = -ENOMEM;
 398         iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
 399         if (!iobuf) {
 400                 printk(PRINT_PREF "error: cannot allocate memory\n");
 401                 goto out;
 402         }
 403
 404         simple_srand(1);
 405         set_random_data(iobuf, mtd->erasesize);
 406
 407         err = scan_for_bad_eraseblocks();
 408         if (err)
 409                 goto out;
 410
 411         err = erase_whole_device();
 412         if (err)
 413                 goto out;
 414
 415         /* Write all eraseblocks, 1 eraseblock at a time */
 416         printk(PRINT_PREF "testing eraseblock write speed\n");
 417         start_timing();
 418         for (i = 0; i < ebcnt; ++i) {
 419                 if (bbt[i])
 420                         continue;
 421                 err = write_eraseblock(i);
 422                 if (err)
 423                         goto out;
 424                 cond_resched();
 425         }
 426         stop_timing();
 427         speed = calc_speed();
 428         printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
 429
 430         /* Read all eraseblocks, 1 eraseblock at a time */
 431         printk(PRINT_PREF "testing eraseblock read speed\n");
 432         start_timing();
 433         for (i = 0; i < ebcnt; ++i) {
 434                 if (bbt[i])
 435                         continue;
 436                 err = read_eraseblock(i);
 437                 if (err)
 438                         goto out;
 439                 cond_resched();
 440         }
 441         stop_timing();
 442         speed = calc_speed();
 443         printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
 444
 445         err = erase_whole_device();
 446         if (err)
 447                 goto out;
 448
 449         /* Write all eraseblocks, 1 page at a time */
 450         printk(PRINT_PREF "testing page write speed\n");
 451         start_timing();
 452         for (i = 0; i < ebcnt; ++i) {
 453                 if (bbt[i])
 454                         continue;
 455                 err = write_eraseblock_by_page(i);
 456                 if (err)
 457                         goto out;
 458                 cond_resched();
 459         }
 460         stop_timing();
 461         speed = calc_speed();
 462         printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
 463
 464         /* Read all eraseblocks, 1 page at a time */
 465         printk(PRINT_PREF "testing page read speed\n");
 466         start_timing();
 467         for (i = 0; i < ebcnt; ++i) {
 468                 if (bbt[i])
 469                         continue;
 470                 err = read_eraseblock_by_page(i);
 471                 if (err)
 472                         goto out;
 473                 cond_resched();
 474         }
 475         stop_timing();
 476         speed = calc_speed();
 477         printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
 478
 479         err = erase_whole_device();
 480         if (err)
 481                 goto out;
 482
 483         /* Write all eraseblocks, 2 pages at a time */
 484         printk(PRINT_PREF "testing 2 page write speed\n");
 485         start_timing();
 486         for (i = 0; i < ebcnt; ++i) {
 487                 if (bbt[i])
 488                         continue;
 489                 err = write_eraseblock_by_2pages(i);
 490                 if (err)
 491                         goto out;
 492                 cond_resched();
 493         }
 494         stop_timing();
 495         speed = calc_speed();
 496         printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
 497
 498         /* Read all eraseblocks, 2 pages at a time */
 499         printk(PRINT_PREF "testing 2 page read speed\n");
 500         start_timing();
 501         for (i = 0; i < ebcnt; ++i) {
 502                 if (bbt[i])
 503                         continue;
 504                 err = read_eraseblock_by_2pages(i);
 505                 if (err)
 506                         goto out;
 507                 cond_resched();
 508         }
 509         stop_timing();
 510         speed = calc_speed();
 511         printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
 512
 513         /* Erase all eraseblocks */
 514         printk(PRINT_PREF "Testing erase speed\n");
 515         start_timing();
 516         for (i = 0; i < ebcnt; ++i) {
 517                 if (bbt[i])
 518                         continue;
 519                 err = erase_eraseblock(i);
 520                 if (err)
 521                         goto out;
 522                 cond_resched();
 523         }
 524         stop_timing();
 525         speed = calc_speed();
 526         printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
 527
 528         /* Multi-block erase all eraseblocks */
 529         for (k = 1; k < 7; k++) {
 530                 blocks = 1 << k;
 531                 printk(PRINT_PREF "Testing %dx multi-block erase speed\n",
 532                        blocks);
 533                 start_timing();
 534                 for (i = 0; i < ebcnt; ) {
 535                         for (j = 0; j < blocks && (i + j) < ebcnt; j++)
 536                                 if (bbt[i + j])
 537                                         break;
 538                         if (j < 1) {
 539                                 i++;
 540                                 continue;
 541                         }
 542                         err = multiblock_erase(i, j);
 543                         if (err)
 544                                 goto out;
 545                         cond_resched();
 546                         i += j;
 547                 }
 548                 stop_timing();
 549                 speed = calc_speed();
 550                 printk(PRINT_PREF "%dx multi-block erase speed is %ld KiB/s\n",
 551                        blocks, speed);
 552         }
 553         printk(PRINT_PREF "finished\n");
 554 out:
 555         kfree(iobuf);
 556         kfree(bbt);
 557         put_mtd_device(mtd);
 558         if (err)
 559                 printk(PRINT_PREF "error %d occurred\n", err);
 560         printk(KERN_INFO "=================================================\n");
 561         return err;
 562 }
 563 module_init(mtd_speedtest_init);
 564
 565 static void __exit mtd_speedtest_exit(void)
 566 {
 567         return;
 568 }
 569 module_exit(mtd_speedtest_exit);
 570
 571 MODULE_DESCRIPTION("Speed test module");
 572 MODULE_AUTHOR("Adrian Hunter");
 573 MODULE_LICENSE("GPL");