1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2007 Nokia Corporation 4 * 5 * Test read and write speed of a MTD device. 6 * 7 * Author: Adrian Hunter <adrian.hunter@nokia.com> 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/init.h> 13 #include <linux/ktime.h> 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/err.h> 17 #include <linux/mtd/mtd.h> 18 #include <linux/slab.h> 19 #include <linux/sched.h> 20 #include <linux/random.h> 21 22 #include "mtd_test.h" 23 24 static int dev = -EINVAL; 25 module_param(dev, int, S_IRUGO); 26 MODULE_PARM_DESC(dev, "MTD device number to use"); 27 28 static int count; 29 module_param(count, int, S_IRUGO); 30 MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use " 31 "(0 means use all)"); 32 33 static struct mtd_info *mtd; 34 static unsigned char *iobuf; 35 static unsigned char *bbt; 36 37 static int pgsize; 38 static int ebcnt; 39 static int pgcnt; 40 static int goodebcnt; 41 static ktime_t start, finish; 42 43 static int multiblock_erase(int ebnum, int blocks) 44 { 45 int err; 46 struct erase_info ei; 47 loff_t addr = (loff_t)ebnum * mtd->erasesize; 48 49 memset(&ei, 0, sizeof(struct erase_info)); 50 ei.addr = addr; 51 ei.len = mtd->erasesize * blocks; 52 53 err = mtd_erase(mtd, &ei); 54 if (err) { 55 pr_err("error %d while erasing EB %d, blocks %d\n", 56 err, ebnum, blocks); 57 return err; 58 } 59 60 return 0; 61 } 62 63 static int write_eraseblock(int ebnum) 64 { 65 loff_t addr = (loff_t)ebnum * mtd->erasesize; 66 67 return mtdtest_write(mtd, addr, mtd->erasesize, iobuf); 68 } 69 70 static int write_eraseblock_by_page(int ebnum) 71 { 72 int i, err = 0; 73 loff_t addr = (loff_t)ebnum * mtd->erasesize; 74 void *buf = iobuf; 75 76 for (i = 0; i < pgcnt; i++) { 77 err = mtdtest_write(mtd, addr, pgsize, buf); 78 if (err) 79 break; 80 addr += pgsize; 81 buf += pgsize; 82 } 83 84 return err; 85 } 86 87 static int write_eraseblock_by_2pages(int ebnum) 88 { 89 size_t sz = pgsize * 2; 90 int i, n = pgcnt / 2, err = 0; 91 loff_t addr = (loff_t)ebnum * mtd->erasesize; 92 void *buf = iobuf; 93 94 for (i = 0; i < n; i++) { 95 err = mtdtest_write(mtd, addr, sz, buf); 96 if (err) 97 return err; 98 addr += sz; 99 buf += sz; 100 } 101 if (pgcnt % 2) 102 err = mtdtest_write(mtd, addr, pgsize, buf); 103 104 return err; 105 } 106 107 static int read_eraseblock(int ebnum) 108 { 109 loff_t addr = (loff_t)ebnum * mtd->erasesize; 110 111 return mtdtest_read(mtd, addr, mtd->erasesize, iobuf); 112 } 113 114 static int read_eraseblock_by_page(int ebnum) 115 { 116 int i, err = 0; 117 loff_t addr = (loff_t)ebnum * mtd->erasesize; 118 void *buf = iobuf; 119 120 for (i = 0; i < pgcnt; i++) { 121 err = mtdtest_read(mtd, addr, pgsize, buf); 122 if (err) 123 break; 124 addr += pgsize; 125 buf += pgsize; 126 } 127 128 return err; 129 } 130 131 static int read_eraseblock_by_2pages(int ebnum) 132 { 133 size_t sz = pgsize * 2; 134 int i, n = pgcnt / 2, err = 0; 135 loff_t addr = (loff_t)ebnum * mtd->erasesize; 136 void *buf = iobuf; 137 138 for (i = 0; i < n; i++) { 139 err = mtdtest_read(mtd, addr, sz, buf); 140 if (err) 141 return err; 142 addr += sz; 143 buf += sz; 144 } 145 if (pgcnt % 2) 146 err = mtdtest_read(mtd, addr, pgsize, buf); 147 148 return err; 149 } 150 151 static inline void start_timing(void) 152 { 153 start = ktime_get(); 154 } 155 156 static inline void stop_timing(void) 157 { 158 finish = ktime_get(); 159 } 160 161 static long calc_speed(void) 162 { 163 uint64_t k, us; 164 165 us = ktime_us_delta(finish, start); 166 if (us == 0) 167 return 0; 168 k = (uint64_t)goodebcnt * (mtd->erasesize / 1024) * 1000000; 169 do_div(k, us); 170 return k; 171 } 172 173 static int __init mtd_speedtest_init(void) 174 { 175 int err, i, blocks, j, k; 176 long speed; 177 uint64_t tmp; 178 179 printk(KERN_INFO "\n"); 180 printk(KERN_INFO "=================================================\n"); 181 182 if (dev < 0) { 183 pr_info("Please specify a valid mtd-device via module parameter\n"); 184 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n"); 185 return -EINVAL; 186 } 187 188 if (count) 189 pr_info("MTD device: %d count: %d\n", dev, count); 190 else 191 pr_info("MTD device: %d\n", dev); 192 193 mtd = get_mtd_device(NULL, dev); 194 if (IS_ERR(mtd)) { 195 err = PTR_ERR(mtd); 196 pr_err("error: cannot get MTD device\n"); 197 return err; 198 } 199 200 if (mtd->writesize == 1) { 201 pr_info("not NAND flash, assume page size is 512 " 202 "bytes.\n"); 203 pgsize = 512; 204 } else 205 pgsize = mtd->writesize; 206 207 tmp = mtd->size; 208 do_div(tmp, mtd->erasesize); 209 ebcnt = tmp; 210 pgcnt = mtd->erasesize / pgsize; 211 212 pr_info("MTD device size %llu, eraseblock size %u, " 213 "page size %u, count of eraseblocks %u, pages per " 214 "eraseblock %u, OOB size %u\n", 215 (unsigned long long)mtd->size, mtd->erasesize, 216 pgsize, ebcnt, pgcnt, mtd->oobsize); 217 218 if (count > 0 && count < ebcnt) 219 ebcnt = count; 220 221 err = -ENOMEM; 222 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL); 223 if (!iobuf) 224 goto out; 225 226 get_random_bytes(iobuf, mtd->erasesize); 227 228 bbt = kzalloc(ebcnt, GFP_KERNEL); 229 if (!bbt) 230 goto out; 231 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt); 232 if (err) 233 goto out; 234 for (i = 0; i < ebcnt; i++) { 235 if (!bbt[i]) 236 goodebcnt++; 237 } 238 239 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 240 if (err) 241 goto out; 242 243 /* Write all eraseblocks, 1 eraseblock at a time */ 244 pr_info("testing eraseblock write speed\n"); 245 start_timing(); 246 for (i = 0; i < ebcnt; ++i) { 247 if (bbt[i]) 248 continue; 249 err = write_eraseblock(i); 250 if (err) 251 goto out; 252 253 err = mtdtest_relax(); 254 if (err) 255 goto out; 256 } 257 stop_timing(); 258 speed = calc_speed(); 259 pr_info("eraseblock write speed is %ld KiB/s\n", speed); 260 261 /* Read all eraseblocks, 1 eraseblock at a time */ 262 pr_info("testing eraseblock read speed\n"); 263 start_timing(); 264 for (i = 0; i < ebcnt; ++i) { 265 if (bbt[i]) 266 continue; 267 err = read_eraseblock(i); 268 if (err) 269 goto out; 270 271 err = mtdtest_relax(); 272 if (err) 273 goto out; 274 } 275 stop_timing(); 276 speed = calc_speed(); 277 pr_info("eraseblock read speed is %ld KiB/s\n", speed); 278 279 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 280 if (err) 281 goto out; 282 283 /* Write all eraseblocks, 1 page at a time */ 284 pr_info("testing page write speed\n"); 285 start_timing(); 286 for (i = 0; i < ebcnt; ++i) { 287 if (bbt[i]) 288 continue; 289 err = write_eraseblock_by_page(i); 290 if (err) 291 goto out; 292 293 err = mtdtest_relax(); 294 if (err) 295 goto out; 296 } 297 stop_timing(); 298 speed = calc_speed(); 299 pr_info("page write speed is %ld KiB/s\n", speed); 300 301 /* Read all eraseblocks, 1 page at a time */ 302 pr_info("testing page read speed\n"); 303 start_timing(); 304 for (i = 0; i < ebcnt; ++i) { 305 if (bbt[i]) 306 continue; 307 err = read_eraseblock_by_page(i); 308 if (err) 309 goto out; 310 311 err = mtdtest_relax(); 312 if (err) 313 goto out; 314 } 315 stop_timing(); 316 speed = calc_speed(); 317 pr_info("page read speed is %ld KiB/s\n", speed); 318 319 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 320 if (err) 321 goto out; 322 323 /* Write all eraseblocks, 2 pages at a time */ 324 pr_info("testing 2 page write speed\n"); 325 start_timing(); 326 for (i = 0; i < ebcnt; ++i) { 327 if (bbt[i]) 328 continue; 329 err = write_eraseblock_by_2pages(i); 330 if (err) 331 goto out; 332 333 err = mtdtest_relax(); 334 if (err) 335 goto out; 336 } 337 stop_timing(); 338 speed = calc_speed(); 339 pr_info("2 page write speed is %ld KiB/s\n", speed); 340 341 /* Read all eraseblocks, 2 pages at a time */ 342 pr_info("testing 2 page read speed\n"); 343 start_timing(); 344 for (i = 0; i < ebcnt; ++i) { 345 if (bbt[i]) 346 continue; 347 err = read_eraseblock_by_2pages(i); 348 if (err) 349 goto out; 350 351 err = mtdtest_relax(); 352 if (err) 353 goto out; 354 } 355 stop_timing(); 356 speed = calc_speed(); 357 pr_info("2 page read speed is %ld KiB/s\n", speed); 358 359 /* Erase all eraseblocks */ 360 pr_info("Testing erase speed\n"); 361 start_timing(); 362 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 363 if (err) 364 goto out; 365 stop_timing(); 366 speed = calc_speed(); 367 pr_info("erase speed is %ld KiB/s\n", speed); 368 369 /* Multi-block erase all eraseblocks */ 370 for (k = 1; k < 7; k++) { 371 blocks = 1 << k; 372 pr_info("Testing %dx multi-block erase speed\n", 373 blocks); 374 start_timing(); 375 for (i = 0; i < ebcnt; ) { 376 for (j = 0; j < blocks && (i + j) < ebcnt; j++) 377 if (bbt[i + j]) 378 break; 379 if (j < 1) { 380 i++; 381 continue; 382 } 383 err = multiblock_erase(i, j); 384 if (err) 385 goto out; 386 387 err = mtdtest_relax(); 388 if (err) 389 goto out; 390 391 i += j; 392 } 393 stop_timing(); 394 speed = calc_speed(); 395 pr_info("%dx multi-block erase speed is %ld KiB/s\n", 396 blocks, speed); 397 } 398 pr_info("finished\n"); 399 out: 400 kfree(iobuf); 401 kfree(bbt); 402 put_mtd_device(mtd); 403 if (err) 404 pr_info("error %d occurred\n", err); 405 printk(KERN_INFO "=================================================\n"); 406 return err; 407 } 408 module_init(mtd_speedtest_init); 409 410 static void __exit mtd_speedtest_exit(void) 411 { 412 return; 413 } 414 module_exit(mtd_speedtest_exit); 415 416 MODULE_DESCRIPTION("Speed test module"); 417 MODULE_AUTHOR("Adrian Hunter"); 418 MODULE_LICENSE("GPL"); 419