pagetest.c 10 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright (C) 2006-2008 Nokia Corporation
  4. *
  5. * Test page read and write on MTD device.
  6. *
  7. * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
  8. */
  9. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10. #include <asm/div64.h>
  11. #include <linux/init.h>
  12. #include <linux/module.h>
  13. #include <linux/moduleparam.h>
  14. #include <linux/err.h>
  15. #include <linux/mtd/mtd.h>
  16. #include <linux/slab.h>
  17. #include <linux/sched.h>
  18. #include <linux/random.h>
  19. #include "mtd_test.h"
  20. static int dev = -EINVAL;
  21. module_param(dev, int, S_IRUGO);
  22. MODULE_PARM_DESC(dev, "MTD device number to use");
  23. static struct mtd_info *mtd;
  24. static unsigned char *twopages;
  25. static unsigned char *writebuf;
  26. static unsigned char *boundary;
  27. static unsigned char *bbt;
  28. static int pgsize;
  29. static int bufsize;
  30. static int ebcnt;
  31. static int pgcnt;
  32. static int errcnt;
  33. static struct rnd_state rnd_state;
  34. static int write_eraseblock(int ebnum)
  35. {
  36. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  37. prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
  38. cond_resched();
  39. return mtdtest_write(mtd, addr, mtd->erasesize, writebuf);
  40. }
  41. static int verify_eraseblock(int ebnum)
  42. {
  43. uint32_t j;
  44. int err = 0, i;
  45. loff_t addr0, addrn;
  46. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  47. addr0 = 0;
  48. for (i = 0; i < ebcnt && bbt[i]; ++i)
  49. addr0 += mtd->erasesize;
  50. addrn = mtd->size;
  51. for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
  52. addrn -= mtd->erasesize;
  53. prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
  54. for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {
  55. /* Do a read to set the internal dataRAMs to different data */
  56. err = mtdtest_read(mtd, addr0, bufsize, twopages);
  57. if (err)
  58. return err;
  59. err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages);
  60. if (err)
  61. return err;
  62. memset(twopages, 0, bufsize);
  63. err = mtdtest_read(mtd, addr, bufsize, twopages);
  64. if (err)
  65. break;
  66. if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) {
  67. pr_err("error: verify failed at %#llx\n",
  68. (long long)addr);
  69. errcnt += 1;
  70. }
  71. }
  72. /* Check boundary between eraseblocks */
  73. if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) {
  74. struct rnd_state old_state = rnd_state;
  75. /* Do a read to set the internal dataRAMs to different data */
  76. err = mtdtest_read(mtd, addr0, bufsize, twopages);
  77. if (err)
  78. return err;
  79. err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages);
  80. if (err)
  81. return err;
  82. memset(twopages, 0, bufsize);
  83. err = mtdtest_read(mtd, addr, bufsize, twopages);
  84. if (err)
  85. return err;
  86. memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);
  87. prandom_bytes_state(&rnd_state, boundary + pgsize, pgsize);
  88. if (memcmp(twopages, boundary, bufsize)) {
  89. pr_err("error: verify failed at %#llx\n",
  90. (long long)addr);
  91. errcnt += 1;
  92. }
  93. rnd_state = old_state;
  94. }
  95. return err;
  96. }
  97. static int crosstest(void)
  98. {
  99. int err = 0, i;
  100. loff_t addr, addr0, addrn;
  101. unsigned char *pp1, *pp2, *pp3, *pp4;
  102. pr_info("crosstest\n");
  103. pp1 = kcalloc(pgsize, 4, GFP_KERNEL);
  104. if (!pp1)
  105. return -ENOMEM;
  106. pp2 = pp1 + pgsize;
  107. pp3 = pp2 + pgsize;
  108. pp4 = pp3 + pgsize;
  109. addr0 = 0;
  110. for (i = 0; i < ebcnt && bbt[i]; ++i)
  111. addr0 += mtd->erasesize;
  112. addrn = mtd->size;
  113. for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
  114. addrn -= mtd->erasesize;
  115. /* Read 2nd-to-last page to pp1 */
  116. addr = addrn - pgsize - pgsize;
  117. err = mtdtest_read(mtd, addr, pgsize, pp1);
  118. if (err) {
  119. kfree(pp1);
  120. return err;
  121. }
  122. /* Read 3rd-to-last page to pp1 */
  123. addr = addrn - pgsize - pgsize - pgsize;
  124. err = mtdtest_read(mtd, addr, pgsize, pp1);
  125. if (err) {
  126. kfree(pp1);
  127. return err;
  128. }
  129. /* Read first page to pp2 */
  130. addr = addr0;
  131. pr_info("reading page at %#llx\n", (long long)addr);
  132. err = mtdtest_read(mtd, addr, pgsize, pp2);
  133. if (err) {
  134. kfree(pp1);
  135. return err;
  136. }
  137. /* Read last page to pp3 */
  138. addr = addrn - pgsize;
  139. pr_info("reading page at %#llx\n", (long long)addr);
  140. err = mtdtest_read(mtd, addr, pgsize, pp3);
  141. if (err) {
  142. kfree(pp1);
  143. return err;
  144. }
  145. /* Read first page again to pp4 */
  146. addr = addr0;
  147. pr_info("reading page at %#llx\n", (long long)addr);
  148. err = mtdtest_read(mtd, addr, pgsize, pp4);
  149. if (err) {
  150. kfree(pp1);
  151. return err;
  152. }
  153. /* pp2 and pp4 should be the same */
  154. pr_info("verifying pages read at %#llx match\n",
  155. (long long)addr0);
  156. if (memcmp(pp2, pp4, pgsize)) {
  157. pr_err("verify failed!\n");
  158. errcnt += 1;
  159. } else if (!err)
  160. pr_info("crosstest ok\n");
  161. kfree(pp1);
  162. return err;
  163. }
  164. static int erasecrosstest(void)
  165. {
  166. int err = 0, i, ebnum, ebnum2;
  167. loff_t addr0;
  168. char *readbuf = twopages;
  169. pr_info("erasecrosstest\n");
  170. ebnum = 0;
  171. addr0 = 0;
  172. for (i = 0; i < ebcnt && bbt[i]; ++i) {
  173. addr0 += mtd->erasesize;
  174. ebnum += 1;
  175. }
  176. ebnum2 = ebcnt - 1;
  177. while (ebnum2 && bbt[ebnum2])
  178. ebnum2 -= 1;
  179. pr_info("erasing block %d\n", ebnum);
  180. err = mtdtest_erase_eraseblock(mtd, ebnum);
  181. if (err)
  182. return err;
  183. pr_info("writing 1st page of block %d\n", ebnum);
  184. prandom_bytes_state(&rnd_state, writebuf, pgsize);
  185. strcpy(writebuf, "There is no data like this!");
  186. err = mtdtest_write(mtd, addr0, pgsize, writebuf);
  187. if (err)
  188. return err;
  189. pr_info("reading 1st page of block %d\n", ebnum);
  190. memset(readbuf, 0, pgsize);
  191. err = mtdtest_read(mtd, addr0, pgsize, readbuf);
  192. if (err)
  193. return err;
  194. pr_info("verifying 1st page of block %d\n", ebnum);
  195. if (memcmp(writebuf, readbuf, pgsize)) {
  196. pr_err("verify failed!\n");
  197. errcnt += 1;
  198. return -1;
  199. }
  200. pr_info("erasing block %d\n", ebnum);
  201. err = mtdtest_erase_eraseblock(mtd, ebnum);
  202. if (err)
  203. return err;
  204. pr_info("writing 1st page of block %d\n", ebnum);
  205. prandom_bytes_state(&rnd_state, writebuf, pgsize);
  206. strcpy(writebuf, "There is no data like this!");
  207. err = mtdtest_write(mtd, addr0, pgsize, writebuf);
  208. if (err)
  209. return err;
  210. pr_info("erasing block %d\n", ebnum2);
  211. err = mtdtest_erase_eraseblock(mtd, ebnum2);
  212. if (err)
  213. return err;
  214. pr_info("reading 1st page of block %d\n", ebnum);
  215. memset(readbuf, 0, pgsize);
  216. err = mtdtest_read(mtd, addr0, pgsize, readbuf);
  217. if (err)
  218. return err;
  219. pr_info("verifying 1st page of block %d\n", ebnum);
  220. if (memcmp(writebuf, readbuf, pgsize)) {
  221. pr_err("verify failed!\n");
  222. errcnt += 1;
  223. return -1;
  224. }
  225. if (!err)
  226. pr_info("erasecrosstest ok\n");
  227. return err;
  228. }
  229. static int erasetest(void)
  230. {
  231. int err = 0, i, ebnum, ok = 1;
  232. loff_t addr0;
  233. pr_info("erasetest\n");
  234. ebnum = 0;
  235. addr0 = 0;
  236. for (i = 0; i < ebcnt && bbt[i]; ++i) {
  237. addr0 += mtd->erasesize;
  238. ebnum += 1;
  239. }
  240. pr_info("erasing block %d\n", ebnum);
  241. err = mtdtest_erase_eraseblock(mtd, ebnum);
  242. if (err)
  243. return err;
  244. pr_info("writing 1st page of block %d\n", ebnum);
  245. prandom_bytes_state(&rnd_state, writebuf, pgsize);
  246. err = mtdtest_write(mtd, addr0, pgsize, writebuf);
  247. if (err)
  248. return err;
  249. pr_info("erasing block %d\n", ebnum);
  250. err = mtdtest_erase_eraseblock(mtd, ebnum);
  251. if (err)
  252. return err;
  253. pr_info("reading 1st page of block %d\n", ebnum);
  254. err = mtdtest_read(mtd, addr0, pgsize, twopages);
  255. if (err)
  256. return err;
  257. pr_info("verifying 1st page of block %d is all 0xff\n",
  258. ebnum);
  259. for (i = 0; i < pgsize; ++i)
  260. if (twopages[i] != 0xff) {
  261. pr_err("verifying all 0xff failed at %d\n",
  262. i);
  263. errcnt += 1;
  264. ok = 0;
  265. break;
  266. }
  267. if (ok && !err)
  268. pr_info("erasetest ok\n");
  269. return err;
  270. }
  271. static int __init mtd_pagetest_init(void)
  272. {
  273. int err = 0;
  274. uint64_t tmp;
  275. uint32_t i;
  276. printk(KERN_INFO "\n");
  277. printk(KERN_INFO "=================================================\n");
  278. if (dev < 0) {
  279. pr_info("Please specify a valid mtd-device via module parameter\n");
  280. pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
  281. return -EINVAL;
  282. }
  283. pr_info("MTD device: %d\n", dev);
  284. mtd = get_mtd_device(NULL, dev);
  285. if (IS_ERR(mtd)) {
  286. err = PTR_ERR(mtd);
  287. pr_err("error: cannot get MTD device\n");
  288. return err;
  289. }
  290. if (!mtd_type_is_nand(mtd)) {
  291. pr_info("this test requires NAND flash\n");
  292. goto out;
  293. }
  294. tmp = mtd->size;
  295. do_div(tmp, mtd->erasesize);
  296. ebcnt = tmp;
  297. pgcnt = mtd->erasesize / mtd->writesize;
  298. pgsize = mtd->writesize;
  299. pr_info("MTD device size %llu, eraseblock size %u, "
  300. "page size %u, count of eraseblocks %u, pages per "
  301. "eraseblock %u, OOB size %u\n",
  302. (unsigned long long)mtd->size, mtd->erasesize,
  303. pgsize, ebcnt, pgcnt, mtd->oobsize);
  304. err = -ENOMEM;
  305. bufsize = pgsize * 2;
  306. writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
  307. if (!writebuf)
  308. goto out;
  309. twopages = kmalloc(bufsize, GFP_KERNEL);
  310. if (!twopages)
  311. goto out;
  312. boundary = kmalloc(bufsize, GFP_KERNEL);
  313. if (!boundary)
  314. goto out;
  315. bbt = kzalloc(ebcnt, GFP_KERNEL);
  316. if (!bbt)
  317. goto out;
  318. err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
  319. if (err)
  320. goto out;
  321. /* Erase all eraseblocks */
  322. pr_info("erasing whole device\n");
  323. err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
  324. if (err)
  325. goto out;
  326. pr_info("erased %u eraseblocks\n", ebcnt);
  327. /* Write all eraseblocks */
  328. prandom_seed_state(&rnd_state, 1);
  329. pr_info("writing whole device\n");
  330. for (i = 0; i < ebcnt; ++i) {
  331. if (bbt[i])
  332. continue;
  333. err = write_eraseblock(i);
  334. if (err)
  335. goto out;
  336. if (i % 256 == 0)
  337. pr_info("written up to eraseblock %u\n", i);
  338. err = mtdtest_relax();
  339. if (err)
  340. goto out;
  341. }
  342. pr_info("written %u eraseblocks\n", i);
  343. /* Check all eraseblocks */
  344. prandom_seed_state(&rnd_state, 1);
  345. pr_info("verifying all eraseblocks\n");
  346. for (i = 0; i < ebcnt; ++i) {
  347. if (bbt[i])
  348. continue;
  349. err = verify_eraseblock(i);
  350. if (err)
  351. goto out;
  352. if (i % 256 == 0)
  353. pr_info("verified up to eraseblock %u\n", i);
  354. err = mtdtest_relax();
  355. if (err)
  356. goto out;
  357. }
  358. pr_info("verified %u eraseblocks\n", i);
  359. err = crosstest();
  360. if (err)
  361. goto out;
  362. if (ebcnt > 1) {
  363. err = erasecrosstest();
  364. if (err)
  365. goto out;
  366. } else {
  367. pr_info("skipping erasecrosstest, 2 erase blocks needed\n");
  368. }
  369. err = erasetest();
  370. if (err)
  371. goto out;
  372. pr_info("finished with %d errors\n", errcnt);
  373. out:
  374. kfree(bbt);
  375. kfree(boundary);
  376. kfree(twopages);
  377. kfree(writebuf);
  378. put_mtd_device(mtd);
  379. if (err)
  380. pr_info("error %d occurred\n", err);
  381. printk(KERN_INFO "=================================================\n");
  382. return err;
  383. }
  384. module_init(mtd_pagetest_init);
  385. static void __exit mtd_pagetest_exit(void)
  386. {
  387. return;
  388. }
  389. module_exit(mtd_pagetest_exit);
  390. MODULE_DESCRIPTION("NAND page test");
  391. MODULE_AUTHOR("Adrian Hunter");
  392. MODULE_LICENSE("GPL");