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 = (loff_t)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 loff_t addr = (loff_t)ebnum * mtd->erasesize; 84 85 return mtdtest_write(mtd, addr, mtd->erasesize, iobuf); 86 } 87 88 static int write_eraseblock_by_page(int ebnum) 89 { 90 int i, err = 0; 91 loff_t addr = (loff_t)ebnum * mtd->erasesize; 92 void *buf = iobuf; 93 94 for (i = 0; i < pgcnt; i++) { 95 err = mtdtest_write(mtd, addr, pgsize, buf); 96 if (err) 97 break; 98 addr += pgsize; 99 buf += pgsize; 100 } 101 102 return err; 103 } 104 105 static int write_eraseblock_by_2pages(int ebnum) 106 { 107 size_t sz = pgsize * 2; 108 int i, n = pgcnt / 2, err = 0; 109 loff_t addr = (loff_t)ebnum * mtd->erasesize; 110 void *buf = iobuf; 111 112 for (i = 0; i < n; i++) { 113 err = mtdtest_write(mtd, addr, sz, buf); 114 if (err) 115 return err; 116 addr += sz; 117 buf += sz; 118 } 119 if (pgcnt % 2) 120 err = mtdtest_write(mtd, addr, pgsize, buf); 121 122 return err; 123 } 124 125 static int read_eraseblock(int ebnum) 126 { 127 loff_t addr = (loff_t)ebnum * mtd->erasesize; 128 129 return mtdtest_read(mtd, addr, mtd->erasesize, iobuf); 130 } 131 132 static int read_eraseblock_by_page(int ebnum) 133 { 134 int i, err = 0; 135 loff_t addr = (loff_t)ebnum * mtd->erasesize; 136 void *buf = iobuf; 137 138 for (i = 0; i < pgcnt; i++) { 139 err = mtdtest_read(mtd, addr, pgsize, buf); 140 if (err) 141 break; 142 addr += pgsize; 143 buf += pgsize; 144 } 145 146 return err; 147 } 148 149 static int read_eraseblock_by_2pages(int ebnum) 150 { 151 size_t sz = pgsize * 2; 152 int i, n = pgcnt / 2, err = 0; 153 loff_t addr = (loff_t)ebnum * mtd->erasesize; 154 void *buf = iobuf; 155 156 for (i = 0; i < n; i++) { 157 err = mtdtest_read(mtd, addr, sz, buf); 158 if (err) 159 return err; 160 addr += sz; 161 buf += sz; 162 } 163 if (pgcnt % 2) 164 err = mtdtest_read(mtd, addr, pgsize, buf); 165 166 return err; 167 } 168 169 static inline void start_timing(void) 170 { 171 do_gettimeofday(&start); 172 } 173 174 static inline void stop_timing(void) 175 { 176 do_gettimeofday(&finish); 177 } 178 179 static long calc_speed(void) 180 { 181 uint64_t k; 182 long ms; 183 184 ms = (finish.tv_sec - start.tv_sec) * 1000 + 185 (finish.tv_usec - start.tv_usec) / 1000; 186 if (ms == 0) 187 return 0; 188 k = 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 cond_resched(); 273 } 274 stop_timing(); 275 speed = calc_speed(); 276 pr_info("eraseblock write speed is %ld KiB/s\n", speed); 277 278 /* Read all eraseblocks, 1 eraseblock at a time */ 279 pr_info("testing eraseblock read speed\n"); 280 start_timing(); 281 for (i = 0; i < ebcnt; ++i) { 282 if (bbt[i]) 283 continue; 284 err = read_eraseblock(i); 285 if (err) 286 goto out; 287 cond_resched(); 288 } 289 stop_timing(); 290 speed = calc_speed(); 291 pr_info("eraseblock read speed is %ld KiB/s\n", speed); 292 293 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 294 if (err) 295 goto out; 296 297 /* Write all eraseblocks, 1 page at a time */ 298 pr_info("testing page write speed\n"); 299 start_timing(); 300 for (i = 0; i < ebcnt; ++i) { 301 if (bbt[i]) 302 continue; 303 err = write_eraseblock_by_page(i); 304 if (err) 305 goto out; 306 cond_resched(); 307 } 308 stop_timing(); 309 speed = calc_speed(); 310 pr_info("page write speed is %ld KiB/s\n", speed); 311 312 /* Read all eraseblocks, 1 page at a time */ 313 pr_info("testing page read speed\n"); 314 start_timing(); 315 for (i = 0; i < ebcnt; ++i) { 316 if (bbt[i]) 317 continue; 318 err = read_eraseblock_by_page(i); 319 if (err) 320 goto out; 321 cond_resched(); 322 } 323 stop_timing(); 324 speed = calc_speed(); 325 pr_info("page read speed is %ld KiB/s\n", speed); 326 327 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 328 if (err) 329 goto out; 330 331 /* Write all eraseblocks, 2 pages at a time */ 332 pr_info("testing 2 page write speed\n"); 333 start_timing(); 334 for (i = 0; i < ebcnt; ++i) { 335 if (bbt[i]) 336 continue; 337 err = write_eraseblock_by_2pages(i); 338 if (err) 339 goto out; 340 cond_resched(); 341 } 342 stop_timing(); 343 speed = calc_speed(); 344 pr_info("2 page write speed is %ld KiB/s\n", speed); 345 346 /* Read all eraseblocks, 2 pages at a time */ 347 pr_info("testing 2 page read speed\n"); 348 start_timing(); 349 for (i = 0; i < ebcnt; ++i) { 350 if (bbt[i]) 351 continue; 352 err = read_eraseblock_by_2pages(i); 353 if (err) 354 goto out; 355 cond_resched(); 356 } 357 stop_timing(); 358 speed = calc_speed(); 359 pr_info("2 page read speed is %ld KiB/s\n", speed); 360 361 /* Erase all eraseblocks */ 362 pr_info("Testing erase speed\n"); 363 start_timing(); 364 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 365 if (err) 366 goto out; 367 stop_timing(); 368 speed = calc_speed(); 369 pr_info("erase speed is %ld KiB/s\n", speed); 370 371 /* Multi-block erase all eraseblocks */ 372 for (k = 1; k < 7; k++) { 373 blocks = 1 << k; 374 pr_info("Testing %dx multi-block erase speed\n", 375 blocks); 376 start_timing(); 377 for (i = 0; i < ebcnt; ) { 378 for (j = 0; j < blocks && (i + j) < ebcnt; j++) 379 if (bbt[i + j]) 380 break; 381 if (j < 1) { 382 i++; 383 continue; 384 } 385 err = multiblock_erase(i, j); 386 if (err) 387 goto out; 388 cond_resched(); 389 i += j; 390 } 391 stop_timing(); 392 speed = calc_speed(); 393 pr_info("%dx multi-block erase speed is %ld KiB/s\n", 394 blocks, speed); 395 } 396 pr_info("finished\n"); 397 out: 398 kfree(iobuf); 399 kfree(bbt); 400 put_mtd_device(mtd); 401 if (err) 402 pr_info("error %d occurred\n", err); 403 printk(KERN_INFO "=================================================\n"); 404 return err; 405 } 406 module_init(mtd_speedtest_init); 407 408 static void __exit mtd_speedtest_exit(void) 409 { 410 return; 411 } 412 module_exit(mtd_speedtest_exit); 413 414 MODULE_DESCRIPTION("Speed test module"); 415 MODULE_AUTHOR("Adrian Hunter"); 416 MODULE_LICENSE("GPL"); 417