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