drivers/mtd/tests/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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  23
  24 #include <linux/init.h>
  25 #include <linux/ktime.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/err.h>
  29 #include <linux/mtd/mtd.h>
  30 #include <linux/slab.h>
  31 #include <linux/sched.h>
  32 #include <linux/random.h>
  33
  34 #include "mtd_test.h"
  35
  36 static int dev = -EINVAL;
  37 module_param(dev, int, S_IRUGO);
  38 MODULE_PARM_DESC(dev, "MTD device number to use");
  39
  40 static int count;
  41 module_param(count, int, S_IRUGO);
  42 MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
  43                         "(0 means use all)");
  44
  45 static struct mtd_info *mtd;
  46 static unsigned char *iobuf;
  47 static unsigned char *bbt;
  48
  49 static int pgsize;
  50 static int ebcnt;
  51 static int pgcnt;
  52 static int goodebcnt;
  53 static ktime_t start, finish;
  54
  55 static int multiblock_erase(int ebnum, int blocks)
  56 {
  57         int err;
  58         struct erase_info ei;
  59         loff_t addr = (loff_t)ebnum * mtd->erasesize;
  60
  61         memset(&ei, 0, sizeof(struct erase_info));
  62         ei.addr = addr;
  63         ei.len  = mtd->erasesize * blocks;
  64
  65         err = mtd_erase(mtd, &ei);
  66         if (err) {
  67                 pr_err("error %d while erasing EB %d, blocks %d\n",
  68                        err, ebnum, blocks);
  69                 return err;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static int write_eraseblock(int ebnum)
  76 {
  77         loff_t addr = (loff_t)ebnum * mtd->erasesize;
  78
  79         return mtdtest_write(mtd, addr, mtd->erasesize, iobuf);
  80 }
  81
  82 static int write_eraseblock_by_page(int ebnum)
  83 {
  84         int i, err = 0;
  85         loff_t addr = (loff_t)ebnum * mtd->erasesize;
  86         void *buf = iobuf;
  87
  88         for (i = 0; i < pgcnt; i++) {
  89                 err = mtdtest_write(mtd, addr, pgsize, buf);
  90                 if (err)
  91                         break;
  92                 addr += pgsize;
  93                 buf += pgsize;
  94         }
  95
  96         return err;
  97 }
  98
  99 static int write_eraseblock_by_2pages(int ebnum)
 100 {
 101         size_t sz = pgsize * 2;
 102         int i, n = pgcnt / 2, err = 0;
 103         loff_t addr = (loff_t)ebnum * mtd->erasesize;
 104         void *buf = iobuf;
 105
 106         for (i = 0; i < n; i++) {
 107                 err = mtdtest_write(mtd, addr, sz, buf);
 108                 if (err)
 109                         return err;
 110                 addr += sz;
 111                 buf += sz;
 112         }
 113         if (pgcnt % 2)
 114                 err = mtdtest_write(mtd, addr, pgsize, buf);
 115
 116         return err;
 117 }
 118
 119 static int read_eraseblock(int ebnum)
 120 {
 121         loff_t addr = (loff_t)ebnum * mtd->erasesize;
 122
 123         return mtdtest_read(mtd, addr, mtd->erasesize, iobuf);
 124 }
 125
 126 static int read_eraseblock_by_page(int ebnum)
 127 {
 128         int i, err = 0;
 129         loff_t addr = (loff_t)ebnum * mtd->erasesize;
 130         void *buf = iobuf;
 131
 132         for (i = 0; i < pgcnt; i++) {
 133                 err = mtdtest_read(mtd, addr, pgsize, buf);
 134                 if (err)
 135                         break;
 136                 addr += pgsize;
 137                 buf += pgsize;
 138         }
 139
 140         return err;
 141 }
 142
 143 static int read_eraseblock_by_2pages(int ebnum)
 144 {
 145         size_t sz = pgsize * 2;
 146         int i, n = pgcnt / 2, err = 0;
 147         loff_t addr = (loff_t)ebnum * mtd->erasesize;
 148         void *buf = iobuf;
 149
 150         for (i = 0; i < n; i++) {
 151                 err = mtdtest_read(mtd, addr, sz, buf);
 152                 if (err)
 153                         return err;
 154                 addr += sz;
 155                 buf += sz;
 156         }
 157         if (pgcnt % 2)
 158                 err = mtdtest_read(mtd, addr, pgsize, buf);
 159
 160         return err;
 161 }
 162
 163 static inline void start_timing(void)
 164 {
 165         start = ktime_get();
 166 }
 167
 168 static inline void stop_timing(void)
 169 {
 170         finish = ktime_get();
 171 }
 172
 173 static long calc_speed(void)
 174 {
 175         uint64_t k;
 176         long ms;
 177
 178         ms = ktime_ms_delta(finish, start);
 179         if (ms == 0)
 180                 return 0;
 181         k = (uint64_t)goodebcnt * (mtd->erasesize / 1024) * 1000;
 182         do_div(k, ms);
 183         return k;
 184 }
 185
 186 static int __init mtd_speedtest_init(void)
 187 {
 188         int err, i, blocks, j, k;
 189         long speed;
 190         uint64_t tmp;
 191
 192         printk(KERN_INFO "\n");
 193         printk(KERN_INFO "=================================================\n");
 194
 195         if (dev < 0) {
 196                 pr_info("Please specify a valid mtd-device via module parameter\n");
 197                 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
 198                 return -EINVAL;
 199         }
 200
 201         if (count)
 202                 pr_info("MTD device: %d    count: %d\n", dev, count);
 203         else
 204                 pr_info("MTD device: %d\n", dev);
 205
 206         mtd = get_mtd_device(NULL, dev);
 207         if (IS_ERR(mtd)) {
 208                 err = PTR_ERR(mtd);
 209                 pr_err("error: cannot get MTD device\n");
 210                 return err;
 211         }
 212
 213         if (mtd->writesize == 1) {
 214                 pr_info("not NAND flash, assume page size is 512 "
 215                        "bytes.\n");
 216                 pgsize = 512;
 217         } else
 218                 pgsize = mtd->writesize;
 219
 220         tmp = mtd->size;
 221         do_div(tmp, mtd->erasesize);
 222         ebcnt = tmp;
 223         pgcnt = mtd->erasesize / pgsize;
 224
 225         pr_info("MTD device size %llu, eraseblock size %u, "
 226                "page size %u, count of eraseblocks %u, pages per "
 227                "eraseblock %u, OOB size %u\n",
 228                (unsigned long long)mtd->size, mtd->erasesize,
 229                pgsize, ebcnt, pgcnt, mtd->oobsize);
 230
 231         if (count > 0 && count < ebcnt)
 232                 ebcnt = count;
 233
 234         err = -ENOMEM;
 235         iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
 236         if (!iobuf)
 237                 goto out;
 238
 239         prandom_bytes(iobuf, mtd->erasesize);
 240
 241         bbt = kzalloc(ebcnt, GFP_KERNEL);
 242         if (!bbt)
 243                 goto out;
 244         err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
 245         if (err)
 246                 goto out;
 247         for (i = 0; i < ebcnt; i++) {
 248                 if (!bbt[i])
 249                         goodebcnt++;
 250         }
 251
 252         err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
 253         if (err)
 254                 goto out;
 255
 256         /* Write all eraseblocks, 1 eraseblock at a time */
 257         pr_info("testing eraseblock write speed\n");
 258         start_timing();
 259         for (i = 0; i < ebcnt; ++i) {
 260                 if (bbt[i])
 261                         continue;
 262                 err = write_eraseblock(i);
 263                 if (err)
 264                         goto out;
 265
 266                 err = mtdtest_relax();
 267                 if (err)
 268                         goto out;
 269         }
 270         stop_timing();
 271         speed = calc_speed();
 272         pr_info("eraseblock write speed is %ld KiB/s\n", speed);
 273
 274         /* Read all eraseblocks, 1 eraseblock at a time */
 275         pr_info("testing eraseblock read speed\n");
 276         start_timing();
 277         for (i = 0; i < ebcnt; ++i) {
 278                 if (bbt[i])
 279                         continue;
 280                 err = read_eraseblock(i);
 281                 if (err)
 282                         goto out;
 283
 284                 err = mtdtest_relax();
 285                 if (err)
 286                         goto out;
 287         }
 288         stop_timing();
 289         speed = calc_speed();
 290         pr_info("eraseblock read speed is %ld KiB/s\n", speed);
 291
 292         err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
 293         if (err)
 294                 goto out;
 295
 296         /* Write all eraseblocks, 1 page at a time */
 297         pr_info("testing page write speed\n");
 298         start_timing();
 299         for (i = 0; i < ebcnt; ++i) {
 300                 if (bbt[i])
 301                         continue;
 302                 err = write_eraseblock_by_page(i);
 303                 if (err)
 304                         goto out;
 305
 306                 err = mtdtest_relax();
 307                 if (err)
 308                         goto out;
 309         }
 310         stop_timing();
 311         speed = calc_speed();
 312         pr_info("page write speed is %ld KiB/s\n", speed);
 313
 314         /* Read all eraseblocks, 1 page at a time */
 315         pr_info("testing page read speed\n");
 316         start_timing();
 317         for (i = 0; i < ebcnt; ++i) {
 318                 if (bbt[i])
 319                         continue;
 320                 err = read_eraseblock_by_page(i);
 321                 if (err)
 322                         goto out;
 323
 324                 err = mtdtest_relax();
 325                 if (err)
 326                         goto out;
 327         }
 328         stop_timing();
 329         speed = calc_speed();
 330         pr_info("page read speed is %ld KiB/s\n", speed);
 331
 332         err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
 333         if (err)
 334                 goto out;
 335
 336         /* Write all eraseblocks, 2 pages at a time */
 337         pr_info("testing 2 page write speed\n");
 338         start_timing();
 339         for (i = 0; i < ebcnt; ++i) {
 340                 if (bbt[i])
 341                         continue;
 342                 err = write_eraseblock_by_2pages(i);
 343                 if (err)
 344                         goto out;
 345
 346                 err = mtdtest_relax();
 347                 if (err)
 348                         goto out;
 349         }
 350         stop_timing();
 351         speed = calc_speed();
 352         pr_info("2 page write speed is %ld KiB/s\n", speed);
 353
 354         /* Read all eraseblocks, 2 pages at a time */
 355         pr_info("testing 2 page read speed\n");
 356         start_timing();
 357         for (i = 0; i < ebcnt; ++i) {
 358                 if (bbt[i])
 359                         continue;
 360                 err = read_eraseblock_by_2pages(i);
 361                 if (err)
 362                         goto out;
 363
 364                 err = mtdtest_relax();
 365                 if (err)
 366                         goto out;
 367         }
 368         stop_timing();
 369         speed = calc_speed();
 370         pr_info("2 page read speed is %ld KiB/s\n", speed);
 371
 372         /* Erase all eraseblocks */
 373         pr_info("Testing erase speed\n");
 374         start_timing();
 375         err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
 376         if (err)
 377                 goto out;
 378         stop_timing();
 379         speed = calc_speed();
 380         pr_info("erase speed is %ld KiB/s\n", speed);
 381
 382         /* Multi-block erase all eraseblocks */
 383         for (k = 1; k < 7; k++) {
 384                 blocks = 1 << k;
 385                 pr_info("Testing %dx multi-block erase speed\n",
 386                        blocks);
 387                 start_timing();
 388                 for (i = 0; i < ebcnt; ) {
 389                         for (j = 0; j < blocks && (i + j) < ebcnt; j++)
 390                                 if (bbt[i + j])
 391                                         break;
 392                         if (j < 1) {
 393                                 i++;
 394                                 continue;
 395                         }
 396                         err = multiblock_erase(i, j);
 397                         if (err)
 398                                 goto out;
 399
 400                         err = mtdtest_relax();
 401                         if (err)
 402                                 goto out;
 403
 404                         i += j;
 405                 }
 406                 stop_timing();
 407                 speed = calc_speed();
 408                 pr_info("%dx multi-block erase speed is %ld KiB/s\n",
 409                        blocks, speed);
 410         }
 411         pr_info("finished\n");
 412 out:
 413         kfree(iobuf);
 414         kfree(bbt);
 415         put_mtd_device(mtd);
 416         if (err)
 417                 pr_info("error %d occurred\n", err);
 418         printk(KERN_INFO "=================================================\n");
 419         return err;
 420 }
 421 module_init(mtd_speedtest_init);
 422
 423 static void __exit mtd_speedtest_exit(void)
 424 {
 425         return;
 426 }
 427 module_exit(mtd_speedtest_exit);
 428
 429 MODULE_DESCRIPTION("Speed test module");
 430 MODULE_AUTHOR("Adrian Hunter");
 431 MODULE_LICENSE("GPL");