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 <ext-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/sched.h>
  28
  29 #define PRINT_PREF KERN_INFO "mtd_speedtest: "
  30
  31 static int dev;
  32 module_param(dev, int, S_IRUGO);
  33 MODULE_PARM_DESC(dev, "MTD device number to use");
  34
  35 static struct mtd_info *mtd;
  36 static unsigned char *iobuf;
  37 static unsigned char *bbt;
  38
  39 static int pgsize;
  40 static int ebcnt;
  41 static int pgcnt;
  42 static int goodebcnt;
  43 static struct timeval start, finish;
  44 static unsigned long next = 1;
  45
  46 static inline unsigned int simple_rand(void)
  47 {
  48         next = next * 1103515245 + 12345;
  49         return (unsigned int)((next / 65536) % 32768);
  50 }
  51
  52 static inline void simple_srand(unsigned long seed)
  53 {
  54         next = seed;
  55 }
  56
  57 static void set_random_data(unsigned char *buf, size_t len)
  58 {
  59         size_t i;
  60
  61         for (i = 0; i < len; ++i)
  62                 buf[i] = simple_rand();
  63 }
  64
  65 static int erase_eraseblock(int ebnum)
  66 {
  67         int err;
  68         struct erase_info ei;
  69         loff_t addr = ebnum * mtd->erasesize;
  70
  71         memset(&ei, 0, sizeof(struct erase_info));
  72         ei.mtd  = mtd;
  73         ei.addr = addr;
  74         ei.len  = mtd->erasesize;
  75
  76         err = mtd->erase(mtd, &ei);
  77         if (err) {
  78                 printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
  79                 return err;
  80         }
  81
  82         if (ei.state == MTD_ERASE_FAILED) {
  83                 printk(PRINT_PREF "some erase error occurred at EB %d\n",
  84                        ebnum);
  85                 return -EIO;
  86         }
  87
  88         return 0;
  89 }
  90
  91 static int erase_whole_device(void)
  92 {
  93         int err;
  94         unsigned int i;
  95
  96         for (i = 0; i < ebcnt; ++i) {
  97                 if (bbt[i])
  98                         continue;
  99                 err = erase_eraseblock(i);
 100                 if (err)
 101                         return err;
 102                 cond_resched();
 103         }
 104         return 0;
 105 }
 106
 107 static int write_eraseblock(int ebnum)
 108 {
 109         size_t written = 0;
 110         int err = 0;
 111         loff_t addr = ebnum * mtd->erasesize;
 112
 113         err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
 114         if (err || written != mtd->erasesize) {
 115                 printk(PRINT_PREF "error: write failed at %#llx\n", addr);
 116                 if (!err)
 117                         err = -EINVAL;
 118         }
 119
 120         return err;
 121 }
 122
 123 static int write_eraseblock_by_page(int ebnum)
 124 {
 125         size_t written = 0;
 126         int i, err = 0;
 127         loff_t addr = ebnum * mtd->erasesize;
 128         void *buf = iobuf;
 129
 130         for (i = 0; i < pgcnt; i++) {
 131                 err = mtd->write(mtd, addr, pgsize, &written, buf);
 132                 if (err || written != pgsize) {
 133                         printk(PRINT_PREF "error: write failed at %#llx\n",
 134                                addr);
 135                         if (!err)
 136                                 err = -EINVAL;
 137                         break;
 138                 }
 139                 addr += pgsize;
 140                 buf += pgsize;
 141         }
 142
 143         return err;
 144 }
 145
 146 static int write_eraseblock_by_2pages(int ebnum)
 147 {
 148         size_t written = 0, sz = pgsize * 2;
 149         int i, n = pgcnt / 2, err = 0;
 150         loff_t addr = ebnum * mtd->erasesize;
 151         void *buf = iobuf;
 152
 153         for (i = 0; i < n; i++) {
 154                 err = mtd->write(mtd, addr, sz, &written, buf);
 155                 if (err || written != sz) {
 156                         printk(PRINT_PREF "error: write failed at %#llx\n",
 157                                addr);
 158                         if (!err)
 159                                 err = -EINVAL;
 160                         return err;
 161                 }
 162                 addr += sz;
 163                 buf += sz;
 164         }
 165         if (pgcnt % 2) {
 166                 err = mtd->write(mtd, addr, pgsize, &written, buf);
 167                 if (err || written != pgsize) {
 168                         printk(PRINT_PREF "error: write failed at %#llx\n",
 169                                addr);
 170                         if (!err)
 171                                 err = -EINVAL;
 172                 }
 173         }
 174
 175         return err;
 176 }
 177
 178 static int read_eraseblock(int ebnum)
 179 {
 180         size_t read = 0;
 181         int err = 0;
 182         loff_t addr = ebnum * mtd->erasesize;
 183
 184         err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
 185         /* Ignore corrected ECC errors */
 186         if (err == -EUCLEAN)
 187                 err = 0;
 188         if (err || read != mtd->erasesize) {
 189                 printk(PRINT_PREF "error: read failed at %#llx\n", addr);
 190                 if (!err)
 191                         err = -EINVAL;
 192         }
 193
 194         return err;
 195 }
 196
 197 static int read_eraseblock_by_page(int ebnum)
 198 {
 199         size_t read = 0;
 200         int i, err = 0;
 201         loff_t addr = ebnum * mtd->erasesize;
 202         void *buf = iobuf;
 203
 204         for (i = 0; i < pgcnt; i++) {
 205                 err = mtd->read(mtd, addr, pgsize, &read, buf);
 206                 /* Ignore corrected ECC errors */
 207                 if (err == -EUCLEAN)
 208                         err = 0;
 209                 if (err || read != pgsize) {
 210                         printk(PRINT_PREF "error: read failed at %#llx\n",
 211                                addr);
 212                         if (!err)
 213                                 err = -EINVAL;
 214                         break;
 215                 }
 216                 addr += pgsize;
 217                 buf += pgsize;
 218         }
 219
 220         return err;
 221 }
 222
 223 static int read_eraseblock_by_2pages(int ebnum)
 224 {
 225         size_t read = 0, sz = pgsize * 2;
 226         int i, n = pgcnt / 2, err = 0;
 227         loff_t addr = ebnum * mtd->erasesize;
 228         void *buf = iobuf;
 229
 230         for (i = 0; i < n; i++) {
 231                 err = mtd->read(mtd, addr, sz, &read, buf);
 232                 /* Ignore corrected ECC errors */
 233                 if (err == -EUCLEAN)
 234                         err = 0;
 235                 if (err || read != sz) {
 236                         printk(PRINT_PREF "error: read failed at %#llx\n",
 237                                addr);
 238                         if (!err)
 239                                 err = -EINVAL;
 240                         return err;
 241                 }
 242                 addr += sz;
 243                 buf += sz;
 244         }
 245         if (pgcnt % 2) {
 246                 err = mtd->read(mtd, addr, pgsize, &read, buf);
 247                 /* Ignore corrected ECC errors */
 248                 if (err == -EUCLEAN)
 249                         err = 0;
 250                 if (err || read != pgsize) {
 251                         printk(PRINT_PREF "error: read failed at %#llx\n",
 252                                addr);
 253                         if (!err)
 254                                 err = -EINVAL;
 255                 }
 256         }
 257
 258         return err;
 259 }
 260
 261 static int is_block_bad(int ebnum)
 262 {
 263         loff_t addr = ebnum * mtd->erasesize;
 264         int ret;
 265
 266         ret = mtd->block_isbad(mtd, addr);
 267         if (ret)
 268                 printk(PRINT_PREF "block %d is bad\n", ebnum);
 269         return ret;
 270 }
 271
 272 static inline void start_timing(void)
 273 {
 274         do_gettimeofday(&start);
 275 }
 276
 277 static inline void stop_timing(void)
 278 {
 279         do_gettimeofday(&finish);
 280 }
 281
 282 static long calc_speed(void)
 283 {
 284         long ms, k, speed;
 285
 286         ms = (finish.tv_sec - start.tv_sec) * 1000 +
 287              (finish.tv_usec - start.tv_usec) / 1000;
 288         k = goodebcnt * mtd->erasesize / 1024;
 289         speed = (k * 1000) / ms;
 290         return speed;
 291 }
 292
 293 static int scan_for_bad_eraseblocks(void)
 294 {
 295         int i, bad = 0;
 296
 297         bbt = kmalloc(ebcnt, GFP_KERNEL);
 298         if (!bbt) {
 299                 printk(PRINT_PREF "error: cannot allocate memory\n");
 300                 return -ENOMEM;
 301         }
 302         memset(bbt, 0 , ebcnt);
 303
 304         printk(PRINT_PREF "scanning for bad eraseblocks\n");
 305         for (i = 0; i < ebcnt; ++i) {
 306                 bbt[i] = is_block_bad(i) ? 1 : 0;
 307                 if (bbt[i])
 308                         bad += 1;
 309                 cond_resched();
 310         }
 311         printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
 312         goodebcnt = ebcnt - bad;
 313         return 0;
 314 }
 315
 316 static int __init mtd_speedtest_init(void)
 317 {
 318         int err, i;
 319         long speed;
 320         uint64_t tmp;
 321
 322         printk(KERN_INFO "\n");
 323         printk(KERN_INFO "=================================================\n");
 324         printk(PRINT_PREF "MTD device: %d\n", dev);
 325
 326         mtd = get_mtd_device(NULL, dev);
 327         if (IS_ERR(mtd)) {
 328                 err = PTR_ERR(mtd);
 329                 printk(PRINT_PREF "error: cannot get MTD device\n");
 330                 return err;
 331         }
 332
 333         if (mtd->writesize == 1) {
 334                 printk(PRINT_PREF "not NAND flash, assume page size is 512 "
 335                        "bytes.\n");
 336                 pgsize = 512;
 337         } else
 338                 pgsize = mtd->writesize;
 339
 340         tmp = mtd->size;
 341         do_div(tmp, mtd->erasesize);
 342         ebcnt = tmp;
 343         pgcnt = mtd->erasesize / mtd->writesize;
 344
 345         printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
 346                "page size %u, count of eraseblocks %u, pages per "
 347                "eraseblock %u, OOB size %u\n",
 348                (unsigned long long)mtd->size, mtd->erasesize,
 349                pgsize, ebcnt, pgcnt, mtd->oobsize);
 350
 351         err = -ENOMEM;
 352         iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
 353         if (!iobuf) {
 354                 printk(PRINT_PREF "error: cannot allocate memory\n");
 355                 goto out;
 356         }
 357
 358         simple_srand(1);
 359         set_random_data(iobuf, mtd->erasesize);
 360
 361         err = scan_for_bad_eraseblocks();
 362         if (err)
 363                 goto out;
 364
 365         err = erase_whole_device();
 366         if (err)
 367                 goto out;
 368
 369         /* Write all eraseblocks, 1 eraseblock at a time */
 370         printk(PRINT_PREF "testing eraseblock write speed\n");
 371         start_timing();
 372         for (i = 0; i < ebcnt; ++i) {
 373                 if (bbt[i])
 374                         continue;
 375                 err = write_eraseblock(i);
 376                 if (err)
 377                         goto out;
 378                 cond_resched();
 379         }
 380         stop_timing();
 381         speed = calc_speed();
 382         printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
 383
 384         /* Read all eraseblocks, 1 eraseblock at a time */
 385         printk(PRINT_PREF "testing eraseblock read speed\n");
 386         start_timing();
 387         for (i = 0; i < ebcnt; ++i) {
 388                 if (bbt[i])
 389                         continue;
 390                 err = read_eraseblock(i);
 391                 if (err)
 392                         goto out;
 393                 cond_resched();
 394         }
 395         stop_timing();
 396         speed = calc_speed();
 397         printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
 398
 399         err = erase_whole_device();
 400         if (err)
 401                 goto out;
 402
 403         /* Write all eraseblocks, 1 page at a time */
 404         printk(PRINT_PREF "testing page write speed\n");
 405         start_timing();
 406         for (i = 0; i < ebcnt; ++i) {
 407                 if (bbt[i])
 408                         continue;
 409                 err = write_eraseblock_by_page(i);
 410                 if (err)
 411                         goto out;
 412                 cond_resched();
 413         }
 414         stop_timing();
 415         speed = calc_speed();
 416         printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
 417
 418         /* Read all eraseblocks, 1 page at a time */
 419         printk(PRINT_PREF "testing page read speed\n");
 420         start_timing();
 421         for (i = 0; i < ebcnt; ++i) {
 422                 if (bbt[i])
 423                         continue;
 424                 err = read_eraseblock_by_page(i);
 425                 if (err)
 426                         goto out;
 427                 cond_resched();
 428         }
 429         stop_timing();
 430         speed = calc_speed();
 431         printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
 432
 433         err = erase_whole_device();
 434         if (err)
 435                 goto out;
 436
 437         /* Write all eraseblocks, 2 pages at a time */
 438         printk(PRINT_PREF "testing 2 page write speed\n");
 439         start_timing();
 440         for (i = 0; i < ebcnt; ++i) {
 441                 if (bbt[i])
 442                         continue;
 443                 err = write_eraseblock_by_2pages(i);
 444                 if (err)
 445                         goto out;
 446                 cond_resched();
 447         }
 448         stop_timing();
 449         speed = calc_speed();
 450         printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
 451
 452         /* Read all eraseblocks, 2 pages at a time */
 453         printk(PRINT_PREF "testing 2 page read speed\n");
 454         start_timing();
 455         for (i = 0; i < ebcnt; ++i) {
 456                 if (bbt[i])
 457                         continue;
 458                 err = read_eraseblock_by_2pages(i);
 459                 if (err)
 460                         goto out;
 461                 cond_resched();
 462         }
 463         stop_timing();
 464         speed = calc_speed();
 465         printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
 466
 467         /* Erase all eraseblocks */
 468         printk(PRINT_PREF "Testing erase speed\n");
 469         start_timing();
 470         for (i = 0; i < ebcnt; ++i) {
 471                 if (bbt[i])
 472                         continue;
 473                 err = erase_eraseblock(i);
 474                 if (err)
 475                         goto out;
 476                 cond_resched();
 477         }
 478         stop_timing();
 479         speed = calc_speed();
 480         printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
 481
 482         printk(PRINT_PREF "finished\n");
 483 out:
 484         kfree(iobuf);
 485         kfree(bbt);
 486         put_mtd_device(mtd);
 487         if (err)
 488                 printk(PRINT_PREF "error %d occurred\n", err);
 489         printk(KERN_INFO "=================================================\n");
 490         return err;
 491 }
 492 module_init(mtd_speedtest_init);
 493
 494 static void __exit mtd_speedtest_exit(void)
 495 {
 496         return;
 497 }
 498 module_exit(mtd_speedtest_exit);
 499
 500 MODULE_DESCRIPTION("Speed test module");
 501 MODULE_AUTHOR("Adrian Hunter");
 502 MODULE_LICENSE("GPL");