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 <[email protected]> 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"); 433