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"); 432