1 /* 2 * Copyright (C) 2006-2008 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 page read and write on MTD device. 18 * 19 * Author: Adrian Hunter <ext-adrian.hunter@nokia.com> 20 */ 21 22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 23 24 #include <asm/div64.h> 25 #include <linux/init.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 struct mtd_info *mtd; 41 static unsigned char *twopages; 42 static unsigned char *writebuf; 43 static unsigned char *boundary; 44 static unsigned char *bbt; 45 46 static int pgsize; 47 static int bufsize; 48 static int ebcnt; 49 static int pgcnt; 50 static int errcnt; 51 static struct rnd_state rnd_state; 52 53 static int write_eraseblock(int ebnum) 54 { 55 int err; 56 loff_t addr = ebnum * mtd->erasesize; 57 58 prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize); 59 cond_resched(); 60 err = mtdtest_write(mtd, addr, mtd->erasesize, writebuf); 61 if (err) 62 pr_err("error: write failed at %#llx\n", 63 (long long)addr); 64 65 return err; 66 } 67 68 static int verify_eraseblock(int ebnum) 69 { 70 uint32_t j; 71 int err = 0, i; 72 loff_t addr0, addrn; 73 loff_t addr = ebnum * mtd->erasesize; 74 75 addr0 = 0; 76 for (i = 0; i < ebcnt && bbt[i]; ++i) 77 addr0 += mtd->erasesize; 78 79 addrn = mtd->size; 80 for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i) 81 addrn -= mtd->erasesize; 82 83 prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize); 84 for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) { 85 /* Do a read to set the internal dataRAMs to different data */ 86 err = mtdtest_read(mtd, addr0, bufsize, twopages); 87 if (err) 88 return err; 89 err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages); 90 if (err) 91 return err; 92 memset(twopages, 0, bufsize); 93 err = mtdtest_read(mtd, addr, bufsize, twopages); 94 if (err) 95 break; 96 if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) { 97 pr_err("error: verify failed at %#llx\n", 98 (long long)addr); 99 errcnt += 1; 100 } 101 } 102 /* Check boundary between eraseblocks */ 103 if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) { 104 struct rnd_state old_state = rnd_state; 105 106 /* Do a read to set the internal dataRAMs to different data */ 107 err = mtdtest_read(mtd, addr0, bufsize, twopages); 108 if (err) 109 return err; 110 err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages); 111 if (err) 112 return err; 113 memset(twopages, 0, bufsize); 114 err = mtdtest_read(mtd, addr, bufsize, twopages); 115 if (err) 116 return err; 117 memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize); 118 prandom_bytes_state(&rnd_state, boundary + pgsize, pgsize); 119 if (memcmp(twopages, boundary, bufsize)) { 120 pr_err("error: verify failed at %#llx\n", 121 (long long)addr); 122 errcnt += 1; 123 } 124 rnd_state = old_state; 125 } 126 return err; 127 } 128 129 static int crosstest(void) 130 { 131 int err = 0, i; 132 loff_t addr, addr0, addrn; 133 unsigned char *pp1, *pp2, *pp3, *pp4; 134 135 pr_info("crosstest\n"); 136 pp1 = kmalloc(pgsize * 4, GFP_KERNEL); 137 if (!pp1) 138 return -ENOMEM; 139 pp2 = pp1 + pgsize; 140 pp3 = pp2 + pgsize; 141 pp4 = pp3 + pgsize; 142 memset(pp1, 0, pgsize * 4); 143 144 addr0 = 0; 145 for (i = 0; i < ebcnt && bbt[i]; ++i) 146 addr0 += mtd->erasesize; 147 148 addrn = mtd->size; 149 for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i) 150 addrn -= mtd->erasesize; 151 152 /* Read 2nd-to-last page to pp1 */ 153 addr = addrn - pgsize - pgsize; 154 err = mtdtest_read(mtd, addr, pgsize, pp1); 155 if (err) { 156 kfree(pp1); 157 return err; 158 } 159 160 /* Read 3rd-to-last page to pp1 */ 161 addr = addrn - pgsize - pgsize - pgsize; 162 err = mtdtest_read(mtd, addr, pgsize, pp1); 163 if (err) { 164 kfree(pp1); 165 return err; 166 } 167 168 /* Read first page to pp2 */ 169 addr = addr0; 170 pr_info("reading page at %#llx\n", (long long)addr); 171 err = mtdtest_read(mtd, addr, pgsize, pp2); 172 if (err) { 173 kfree(pp1); 174 return err; 175 } 176 177 /* Read last page to pp3 */ 178 addr = addrn - pgsize; 179 pr_info("reading page at %#llx\n", (long long)addr); 180 err = mtdtest_read(mtd, addr, pgsize, pp3); 181 if (err) { 182 kfree(pp1); 183 return err; 184 } 185 186 /* Read first page again to pp4 */ 187 addr = addr0; 188 pr_info("reading page at %#llx\n", (long long)addr); 189 err = mtdtest_read(mtd, addr, pgsize, pp4); 190 if (err) { 191 kfree(pp1); 192 return err; 193 } 194 195 /* pp2 and pp4 should be the same */ 196 pr_info("verifying pages read at %#llx match\n", 197 (long long)addr0); 198 if (memcmp(pp2, pp4, pgsize)) { 199 pr_err("verify failed!\n"); 200 errcnt += 1; 201 } else if (!err) 202 pr_info("crosstest ok\n"); 203 kfree(pp1); 204 return err; 205 } 206 207 static int erasecrosstest(void) 208 { 209 int err = 0, i, ebnum, ebnum2; 210 loff_t addr0; 211 char *readbuf = twopages; 212 213 pr_info("erasecrosstest\n"); 214 215 ebnum = 0; 216 addr0 = 0; 217 for (i = 0; i < ebcnt && bbt[i]; ++i) { 218 addr0 += mtd->erasesize; 219 ebnum += 1; 220 } 221 222 ebnum2 = ebcnt - 1; 223 while (ebnum2 && bbt[ebnum2]) 224 ebnum2 -= 1; 225 226 pr_info("erasing block %d\n", ebnum); 227 err = mtdtest_erase_eraseblock(mtd, ebnum); 228 if (err) 229 return err; 230 231 pr_info("writing 1st page of block %d\n", ebnum); 232 prandom_bytes_state(&rnd_state, writebuf, pgsize); 233 strcpy(writebuf, "There is no data like this!"); 234 err = mtdtest_write(mtd, addr0, pgsize, writebuf); 235 if (err) { 236 pr_info("error: write failed at %#llx\n", 237 (long long)addr0); 238 return err; 239 } 240 241 pr_info("reading 1st page of block %d\n", ebnum); 242 memset(readbuf, 0, pgsize); 243 err = mtdtest_read(mtd, addr0, pgsize, readbuf); 244 if (err) 245 return err; 246 247 pr_info("verifying 1st page of block %d\n", ebnum); 248 if (memcmp(writebuf, readbuf, pgsize)) { 249 pr_err("verify failed!\n"); 250 errcnt += 1; 251 return -1; 252 } 253 254 pr_info("erasing block %d\n", ebnum); 255 err = mtdtest_erase_eraseblock(mtd, ebnum); 256 if (err) 257 return err; 258 259 pr_info("writing 1st page of block %d\n", ebnum); 260 prandom_bytes_state(&rnd_state, writebuf, pgsize); 261 strcpy(writebuf, "There is no data like this!"); 262 err = mtdtest_write(mtd, addr0, pgsize, writebuf); 263 if (err) { 264 pr_err("error: write failed at %#llx\n", 265 (long long)addr0); 266 return err; 267 } 268 269 pr_info("erasing block %d\n", ebnum2); 270 err = mtdtest_erase_eraseblock(mtd, ebnum2); 271 if (err) 272 return err; 273 274 pr_info("reading 1st page of block %d\n", ebnum); 275 memset(readbuf, 0, pgsize); 276 err = mtdtest_read(mtd, addr0, pgsize, readbuf); 277 if (err) 278 return err; 279 280 pr_info("verifying 1st page of block %d\n", ebnum); 281 if (memcmp(writebuf, readbuf, pgsize)) { 282 pr_err("verify failed!\n"); 283 errcnt += 1; 284 return -1; 285 } 286 287 if (!err) 288 pr_info("erasecrosstest ok\n"); 289 return err; 290 } 291 292 static int erasetest(void) 293 { 294 int err = 0, i, ebnum, ok = 1; 295 loff_t addr0; 296 297 pr_info("erasetest\n"); 298 299 ebnum = 0; 300 addr0 = 0; 301 for (i = 0; i < ebcnt && bbt[i]; ++i) { 302 addr0 += mtd->erasesize; 303 ebnum += 1; 304 } 305 306 pr_info("erasing block %d\n", ebnum); 307 err = mtdtest_erase_eraseblock(mtd, ebnum); 308 if (err) 309 return err; 310 311 pr_info("writing 1st page of block %d\n", ebnum); 312 prandom_bytes_state(&rnd_state, writebuf, pgsize); 313 err = mtdtest_write(mtd, addr0, pgsize, writebuf); 314 if (err) { 315 pr_err("error: write failed at %#llx\n", 316 (long long)addr0); 317 return err; 318 } 319 320 pr_info("erasing block %d\n", ebnum); 321 err = mtdtest_erase_eraseblock(mtd, ebnum); 322 if (err) 323 return err; 324 325 pr_info("reading 1st page of block %d\n", ebnum); 326 err = mtdtest_read(mtd, addr0, pgsize, twopages); 327 if (err) 328 return err; 329 330 pr_info("verifying 1st page of block %d is all 0xff\n", 331 ebnum); 332 for (i = 0; i < pgsize; ++i) 333 if (twopages[i] != 0xff) { 334 pr_err("verifying all 0xff failed at %d\n", 335 i); 336 errcnt += 1; 337 ok = 0; 338 break; 339 } 340 341 if (ok && !err) 342 pr_info("erasetest ok\n"); 343 344 return err; 345 } 346 347 static int __init mtd_pagetest_init(void) 348 { 349 int err = 0; 350 uint64_t tmp; 351 uint32_t i; 352 353 printk(KERN_INFO "\n"); 354 printk(KERN_INFO "=================================================\n"); 355 356 if (dev < 0) { 357 pr_info("Please specify a valid mtd-device via module parameter\n"); 358 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n"); 359 return -EINVAL; 360 } 361 362 pr_info("MTD device: %d\n", dev); 363 364 mtd = get_mtd_device(NULL, dev); 365 if (IS_ERR(mtd)) { 366 err = PTR_ERR(mtd); 367 pr_err("error: cannot get MTD device\n"); 368 return err; 369 } 370 371 if (mtd->type != MTD_NANDFLASH) { 372 pr_info("this test requires NAND flash\n"); 373 goto out; 374 } 375 376 tmp = mtd->size; 377 do_div(tmp, mtd->erasesize); 378 ebcnt = tmp; 379 pgcnt = mtd->erasesize / mtd->writesize; 380 pgsize = mtd->writesize; 381 382 pr_info("MTD device size %llu, eraseblock size %u, " 383 "page size %u, count of eraseblocks %u, pages per " 384 "eraseblock %u, OOB size %u\n", 385 (unsigned long long)mtd->size, mtd->erasesize, 386 pgsize, ebcnt, pgcnt, mtd->oobsize); 387 388 err = -ENOMEM; 389 bufsize = pgsize * 2; 390 writebuf = kmalloc(mtd->erasesize, GFP_KERNEL); 391 if (!writebuf) 392 goto out; 393 twopages = kmalloc(bufsize, GFP_KERNEL); 394 if (!twopages) 395 goto out; 396 boundary = kmalloc(bufsize, GFP_KERNEL); 397 if (!boundary) 398 goto out; 399 400 bbt = kzalloc(ebcnt, GFP_KERNEL); 401 if (!bbt) 402 goto out; 403 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt); 404 if (err) 405 goto out; 406 407 /* Erase all eraseblocks */ 408 pr_info("erasing whole device\n"); 409 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt); 410 if (err) 411 goto out; 412 pr_info("erased %u eraseblocks\n", ebcnt); 413 414 /* Write all eraseblocks */ 415 prandom_seed_state(&rnd_state, 1); 416 pr_info("writing whole device\n"); 417 for (i = 0; i < ebcnt; ++i) { 418 if (bbt[i]) 419 continue; 420 err = write_eraseblock(i); 421 if (err) 422 goto out; 423 if (i % 256 == 0) 424 pr_info("written up to eraseblock %u\n", i); 425 cond_resched(); 426 } 427 pr_info("written %u eraseblocks\n", i); 428 429 /* Check all eraseblocks */ 430 prandom_seed_state(&rnd_state, 1); 431 pr_info("verifying all eraseblocks\n"); 432 for (i = 0; i < ebcnt; ++i) { 433 if (bbt[i]) 434 continue; 435 err = verify_eraseblock(i); 436 if (err) 437 goto out; 438 if (i % 256 == 0) 439 pr_info("verified up to eraseblock %u\n", i); 440 cond_resched(); 441 } 442 pr_info("verified %u eraseblocks\n", i); 443 444 err = crosstest(); 445 if (err) 446 goto out; 447 448 err = erasecrosstest(); 449 if (err) 450 goto out; 451 452 err = erasetest(); 453 if (err) 454 goto out; 455 456 pr_info("finished with %d errors\n", errcnt); 457 out: 458 459 kfree(bbt); 460 kfree(boundary); 461 kfree(twopages); 462 kfree(writebuf); 463 put_mtd_device(mtd); 464 if (err) 465 pr_info("error %d occurred\n", err); 466 printk(KERN_INFO "=================================================\n"); 467 return err; 468 } 469 module_init(mtd_pagetest_init); 470 471 static void __exit mtd_pagetest_exit(void) 472 { 473 return; 474 } 475 module_exit(mtd_pagetest_exit); 476 477 MODULE_DESCRIPTION("NAND page test"); 478 MODULE_AUTHOR("Adrian Hunter"); 479 MODULE_LICENSE("GPL"); 480