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.mtd = mtd; 63 ei.addr = addr; 64 ei.len = mtd->erasesize * blocks; 65 66 err = mtd_erase(mtd, &ei); 67 if (err) { 68 pr_err("error %d while erasing EB %d, blocks %d\n", 69 err, ebnum, blocks); 70 return err; 71 } 72 73 if (ei.state == MTD_ERASE_FAILED) { 74 pr_err("some erase error occurred at EB %d," 75 "blocks %d\n", ebnum, blocks); 76 return -EIO; 77 } 78 79 return 0; 80 } 81 82 static int write_eraseblock(int ebnum) 83 { 84 loff_t addr = (loff_t)ebnum * mtd->erasesize; 85 86 return mtdtest_write(mtd, addr, mtd->erasesize, iobuf); 87 } 88 89 static int write_eraseblock_by_page(int ebnum) 90 { 91 int i, err = 0; 92 loff_t addr = (loff_t)ebnum * mtd->erasesize; 93 void *buf = iobuf; 94 95 for (i = 0; i < pgcnt; i++) { 96 err = mtdtest_write(mtd, addr, pgsize, buf); 97 if (err) 98 break; 99 addr += pgsize; 100 buf += pgsize; 101 } 102 103 return err; 104 } 105 106 static int write_eraseblock_by_2pages(int ebnum) 107 { 108 size_t sz = pgsize * 2; 109 int i, n = pgcnt / 2, err = 0; 110 loff_t addr = (loff_t)ebnum * mtd->erasesize; 111 void *buf = iobuf; 112 113 for (i = 0; i < n; i++) { 114 err = mtdtest_write(mtd, addr, sz, buf); 115 if (err) 116 return err; 117 addr += sz; 118 buf += sz; 119 } 120 if (pgcnt % 2) 121 err = mtdtest_write(mtd, addr, pgsize, buf); 122 123 return err; 124 } 125 126 static int read_eraseblock(int ebnum) 127 { 128 loff_t addr = (loff_t)ebnum * mtd->erasesize; 129 130 return mtdtest_read(mtd, addr, mtd->erasesize, iobuf); 131 } 132 133 static int read_eraseblock_by_page(int ebnum) 134 { 135 int i, err = 0; 136 loff_t addr = (loff_t)ebnum * mtd->erasesize; 137 void *buf = iobuf; 138 139 for (i = 0; i < pgcnt; i++) { 140 err = mtdtest_read(mtd, addr, pgsize, buf); 141 if (err) 142 break; 143 addr += pgsize; 144 buf += pgsize; 145 } 146 147 return err; 148 } 149 150 static int read_eraseblock_by_2pages(int ebnum) 151 { 152 size_t sz = pgsize * 2; 153 int i, n = pgcnt / 2, err = 0; 154 loff_t addr = (loff_t)ebnum * mtd->erasesize; 155 void *buf = iobuf; 156 157 for (i = 0; i < n; i++) { 158 err = mtdtest_read(mtd, addr, sz, buf); 159 if (err) 160 return err; 161 addr += sz; 162 buf += sz; 163 } 164 if (pgcnt % 2) 165 err = mtdtest_read(mtd, addr, pgsize, buf); 166 167 return err; 168 } 169 170 static inline void start_timing(void) 171 { 172 start = ktime_get(); 173 } 174 175 static inline void stop_timing(void) 176 { 177 finish = ktime_get(); 178 } 179 180 static long calc_speed(void) 181 { 182 uint64_t k; 183 long ms; 184 185 ms = ktime_ms_delta(finish, start); 186 if (ms == 0) 187 return 0; 188 k = (uint64_t)goodebcnt * (mtd->erasesize / 1024) * 1000; 189 do_div(k, ms); 190 return k; 191 } 192 193 static int __init mtd_speedtest_init(void) 194 { 195 int err, i, blocks, j, k; 196 long speed; 197 uint64_t tmp; 198 199 printk(KERN_INFO "\n"); 200 printk(KERN_INFO "=================================================\n"); 201 202 if (dev < 0) { 203 pr_info("Please specify a valid mtd-device via module parameter\n"); 204 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n"); 205 return -EINVAL; 206 } 207 208 if (count) 209 pr_info("MTD device: %d count: %d\n", dev, count); 210 else 211 pr_info("MTD device: %d\n", dev); 212 213 mtd = get_mtd_device(NULL, dev); 214 if (IS_ERR(mtd)) { 215 err = PTR_ERR(mtd); 216 pr_err("error: cannot get MTD device\n"); 217 return err; 218 } 219 220 if (mtd->writesize == 1) { 221 pr_info("not NAND flash, assume page size is 512 " 222 "bytes.\n"); 223 pgsize = 512; 224 } else 225 pgsize = mtd->writesize; 226 227 tmp = mtd->size; 228 do_div(tmp, mtd->erasesize); 229 ebcnt = tmp; 230 pgcnt = mtd->erasesize / pgsize; 231 232 pr_info("MTD device size %llu, eraseblock size %u, " 233 "page size %u, count of eraseblocks %u, pages per " 234 "eraseblock %u, OOB size %u\n", 235 (unsigned long long)mtd->size, mtd->erasesize, 236 pgsize, ebcnt, pgcnt, mtd->oobsize); 237 238 if (count > 0 && count < ebcnt) 239 ebcnt = count; 240 241 err = -ENOMEM; 242 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL); 243 if (!iobuf) 244 goto out; 245 246 prandom_bytes(iobuf, mtd->erasesize); 247 248 bbt = kzalloc(ebcnt, GFP_KERNEL); 249 if (!bbt) 250 goto out; 251 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt); 252 if (err) 253 goto out; 254 for (i = 0; i < ebcnt; i++) { 255 if (!bbt[i]) 256 goodebcnt++; 257 } 258 259 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 260 if (err) 261 goto out; 262 263 /* Write all eraseblocks, 1 eraseblock at a time */ 264 pr_info("testing eraseblock write speed\n"); 265 start_timing(); 266 for (i = 0; i < ebcnt; ++i) { 267 if (bbt[i]) 268 continue; 269 err = write_eraseblock(i); 270 if (err) 271 goto out; 272 273 err = mtdtest_relax(); 274 if (err) 275 goto out; 276 } 277 stop_timing(); 278 speed = calc_speed(); 279 pr_info("eraseblock write speed is %ld KiB/s\n", speed); 280 281 /* Read all eraseblocks, 1 eraseblock at a time */ 282 pr_info("testing eraseblock read speed\n"); 283 start_timing(); 284 for (i = 0; i < ebcnt; ++i) { 285 if (bbt[i]) 286 continue; 287 err = read_eraseblock(i); 288 if (err) 289 goto out; 290 291 err = mtdtest_relax(); 292 if (err) 293 goto out; 294 } 295 stop_timing(); 296 speed = calc_speed(); 297 pr_info("eraseblock read speed is %ld KiB/s\n", speed); 298 299 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 300 if (err) 301 goto out; 302 303 /* Write all eraseblocks, 1 page at a time */ 304 pr_info("testing page write speed\n"); 305 start_timing(); 306 for (i = 0; i < ebcnt; ++i) { 307 if (bbt[i]) 308 continue; 309 err = write_eraseblock_by_page(i); 310 if (err) 311 goto out; 312 313 err = mtdtest_relax(); 314 if (err) 315 goto out; 316 } 317 stop_timing(); 318 speed = calc_speed(); 319 pr_info("page write speed is %ld KiB/s\n", speed); 320 321 /* Read all eraseblocks, 1 page at a time */ 322 pr_info("testing page read speed\n"); 323 start_timing(); 324 for (i = 0; i < ebcnt; ++i) { 325 if (bbt[i]) 326 continue; 327 err = read_eraseblock_by_page(i); 328 if (err) 329 goto out; 330 331 err = mtdtest_relax(); 332 if (err) 333 goto out; 334 } 335 stop_timing(); 336 speed = calc_speed(); 337 pr_info("page read speed is %ld KiB/s\n", speed); 338 339 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 340 if (err) 341 goto out; 342 343 /* Write all eraseblocks, 2 pages at a time */ 344 pr_info("testing 2 page write speed\n"); 345 start_timing(); 346 for (i = 0; i < ebcnt; ++i) { 347 if (bbt[i]) 348 continue; 349 err = write_eraseblock_by_2pages(i); 350 if (err) 351 goto out; 352 353 err = mtdtest_relax(); 354 if (err) 355 goto out; 356 } 357 stop_timing(); 358 speed = calc_speed(); 359 pr_info("2 page write speed is %ld KiB/s\n", speed); 360 361 /* Read all eraseblocks, 2 pages at a time */ 362 pr_info("testing 2 page read speed\n"); 363 start_timing(); 364 for (i = 0; i < ebcnt; ++i) { 365 if (bbt[i]) 366 continue; 367 err = read_eraseblock_by_2pages(i); 368 if (err) 369 goto out; 370 371 err = mtdtest_relax(); 372 if (err) 373 goto out; 374 } 375 stop_timing(); 376 speed = calc_speed(); 377 pr_info("2 page read speed is %ld KiB/s\n", speed); 378 379 /* Erase all eraseblocks */ 380 pr_info("Testing erase speed\n"); 381 start_timing(); 382 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 383 if (err) 384 goto out; 385 stop_timing(); 386 speed = calc_speed(); 387 pr_info("erase speed is %ld KiB/s\n", speed); 388 389 /* Multi-block erase all eraseblocks */ 390 for (k = 1; k < 7; k++) { 391 blocks = 1 << k; 392 pr_info("Testing %dx multi-block erase speed\n", 393 blocks); 394 start_timing(); 395 for (i = 0; i < ebcnt; ) { 396 for (j = 0; j < blocks && (i + j) < ebcnt; j++) 397 if (bbt[i + j]) 398 break; 399 if (j < 1) { 400 i++; 401 continue; 402 } 403 err = multiblock_erase(i, j); 404 if (err) 405 goto out; 406 407 err = mtdtest_relax(); 408 if (err) 409 goto out; 410 411 i += j; 412 } 413 stop_timing(); 414 speed = calc_speed(); 415 pr_info("%dx multi-block erase speed is %ld KiB/s\n", 416 blocks, speed); 417 } 418 pr_info("finished\n"); 419 out: 420 kfree(iobuf); 421 kfree(bbt); 422 put_mtd_device(mtd); 423 if (err) 424 pr_info("error %d occurred\n", err); 425 printk(KERN_INFO "=================================================\n"); 426 return err; 427 } 428 module_init(mtd_speedtest_init); 429 430 static void __exit mtd_speedtest_exit(void) 431 { 432 return; 433 } 434 module_exit(mtd_speedtest_exit); 435 436 MODULE_DESCRIPTION("Speed test module"); 437 MODULE_AUTHOR("Adrian Hunter"); 438 MODULE_LICENSE("GPL"); 439