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; 164 long ms; 165 166 ms = ktime_ms_delta(finish, start); 167 if (ms == 0) 168 return 0; 169 k = (uint64_t)goodebcnt * (mtd->erasesize / 1024) * 1000; 170 do_div(k, ms); 171 return k; 172 } 173 174 static int __init mtd_speedtest_init(void) 175 { 176 int err, i, blocks, j, k; 177 long speed; 178 uint64_t tmp; 179 180 printk(KERN_INFO "\n"); 181 printk(KERN_INFO "=================================================\n"); 182 183 if (dev < 0) { 184 pr_info("Please specify a valid mtd-device via module parameter\n"); 185 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n"); 186 return -EINVAL; 187 } 188 189 if (count) 190 pr_info("MTD device: %d count: %d\n", dev, count); 191 else 192 pr_info("MTD device: %d\n", dev); 193 194 mtd = get_mtd_device(NULL, dev); 195 if (IS_ERR(mtd)) { 196 err = PTR_ERR(mtd); 197 pr_err("error: cannot get MTD device\n"); 198 return err; 199 } 200 201 if (mtd->writesize == 1) { 202 pr_info("not NAND flash, assume page size is 512 " 203 "bytes.\n"); 204 pgsize = 512; 205 } else 206 pgsize = mtd->writesize; 207 208 tmp = mtd->size; 209 do_div(tmp, mtd->erasesize); 210 ebcnt = tmp; 211 pgcnt = mtd->erasesize / pgsize; 212 213 pr_info("MTD device size %llu, eraseblock size %u, " 214 "page size %u, count of eraseblocks %u, pages per " 215 "eraseblock %u, OOB size %u\n", 216 (unsigned long long)mtd->size, mtd->erasesize, 217 pgsize, ebcnt, pgcnt, mtd->oobsize); 218 219 if (count > 0 && count < ebcnt) 220 ebcnt = count; 221 222 err = -ENOMEM; 223 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL); 224 if (!iobuf) 225 goto out; 226 227 prandom_bytes(iobuf, mtd->erasesize); 228 229 bbt = kzalloc(ebcnt, GFP_KERNEL); 230 if (!bbt) 231 goto out; 232 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt); 233 if (err) 234 goto out; 235 for (i = 0; i < ebcnt; i++) { 236 if (!bbt[i]) 237 goodebcnt++; 238 } 239 240 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 241 if (err) 242 goto out; 243 244 /* Write all eraseblocks, 1 eraseblock at a time */ 245 pr_info("testing eraseblock write speed\n"); 246 start_timing(); 247 for (i = 0; i < ebcnt; ++i) { 248 if (bbt[i]) 249 continue; 250 err = write_eraseblock(i); 251 if (err) 252 goto out; 253 254 err = mtdtest_relax(); 255 if (err) 256 goto out; 257 } 258 stop_timing(); 259 speed = calc_speed(); 260 pr_info("eraseblock write speed is %ld KiB/s\n", speed); 261 262 /* Read all eraseblocks, 1 eraseblock at a time */ 263 pr_info("testing eraseblock read speed\n"); 264 start_timing(); 265 for (i = 0; i < ebcnt; ++i) { 266 if (bbt[i]) 267 continue; 268 err = read_eraseblock(i); 269 if (err) 270 goto out; 271 272 err = mtdtest_relax(); 273 if (err) 274 goto out; 275 } 276 stop_timing(); 277 speed = calc_speed(); 278 pr_info("eraseblock read speed is %ld KiB/s\n", speed); 279 280 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 281 if (err) 282 goto out; 283 284 /* Write all eraseblocks, 1 page at a time */ 285 pr_info("testing page write speed\n"); 286 start_timing(); 287 for (i = 0; i < ebcnt; ++i) { 288 if (bbt[i]) 289 continue; 290 err = write_eraseblock_by_page(i); 291 if (err) 292 goto out; 293 294 err = mtdtest_relax(); 295 if (err) 296 goto out; 297 } 298 stop_timing(); 299 speed = calc_speed(); 300 pr_info("page write speed is %ld KiB/s\n", speed); 301 302 /* Read all eraseblocks, 1 page at a time */ 303 pr_info("testing page read speed\n"); 304 start_timing(); 305 for (i = 0; i < ebcnt; ++i) { 306 if (bbt[i]) 307 continue; 308 err = read_eraseblock_by_page(i); 309 if (err) 310 goto out; 311 312 err = mtdtest_relax(); 313 if (err) 314 goto out; 315 } 316 stop_timing(); 317 speed = calc_speed(); 318 pr_info("page read speed is %ld KiB/s\n", speed); 319 320 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 321 if (err) 322 goto out; 323 324 /* Write all eraseblocks, 2 pages at a time */ 325 pr_info("testing 2 page write speed\n"); 326 start_timing(); 327 for (i = 0; i < ebcnt; ++i) { 328 if (bbt[i]) 329 continue; 330 err = write_eraseblock_by_2pages(i); 331 if (err) 332 goto out; 333 334 err = mtdtest_relax(); 335 if (err) 336 goto out; 337 } 338 stop_timing(); 339 speed = calc_speed(); 340 pr_info("2 page write speed is %ld KiB/s\n", speed); 341 342 /* Read all eraseblocks, 2 pages at a time */ 343 pr_info("testing 2 page read speed\n"); 344 start_timing(); 345 for (i = 0; i < ebcnt; ++i) { 346 if (bbt[i]) 347 continue; 348 err = read_eraseblock_by_2pages(i); 349 if (err) 350 goto out; 351 352 err = mtdtest_relax(); 353 if (err) 354 goto out; 355 } 356 stop_timing(); 357 speed = calc_speed(); 358 pr_info("2 page read speed is %ld KiB/s\n", speed); 359 360 /* Erase all eraseblocks */ 361 pr_info("Testing erase speed\n"); 362 start_timing(); 363 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 364 if (err) 365 goto out; 366 stop_timing(); 367 speed = calc_speed(); 368 pr_info("erase speed is %ld KiB/s\n", speed); 369 370 /* Multi-block erase all eraseblocks */ 371 for (k = 1; k < 7; k++) { 372 blocks = 1 << k; 373 pr_info("Testing %dx multi-block erase speed\n", 374 blocks); 375 start_timing(); 376 for (i = 0; i < ebcnt; ) { 377 for (j = 0; j < blocks && (i + j) < ebcnt; j++) 378 if (bbt[i + j]) 379 break; 380 if (j < 1) { 381 i++; 382 continue; 383 } 384 err = multiblock_erase(i, j); 385 if (err) 386 goto out; 387 388 err = mtdtest_relax(); 389 if (err) 390 goto out; 391 392 i += j; 393 } 394 stop_timing(); 395 speed = calc_speed(); 396 pr_info("%dx multi-block erase speed is %ld KiB/s\n", 397 blocks, speed); 398 } 399 pr_info("finished\n"); 400 out: 401 kfree(iobuf); 402 kfree(bbt); 403 put_mtd_device(mtd); 404 if (err) 405 pr_info("error %d occurred\n", err); 406 printk(KERN_INFO "=================================================\n"); 407 return err; 408 } 409 module_init(mtd_speedtest_init); 410 411 static void __exit mtd_speedtest_exit(void) 412 { 413 return; 414 } 415 module_exit(mtd_speedtest_exit); 416 417 MODULE_DESCRIPTION("Speed test module"); 418 MODULE_AUTHOR("Adrian Hunter"); 419 MODULE_LICENSE("GPL"); 420