speedtest.c 8.4 KB

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  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. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10. #include <linux/init.h>
  11. #include <linux/ktime.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 int count;
  24. module_param(count, int, S_IRUGO);
  25. MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
  26. "(0 means use all)");
  27. static struct mtd_info *mtd;
  28. static unsigned char *iobuf;
  29. static unsigned char *bbt;
  30. static int pgsize;
  31. static int ebcnt;
  32. static int pgcnt;
  33. static int goodebcnt;
  34. static ktime_t start, finish;
  35. static int multiblock_erase(int ebnum, int blocks)
  36. {
  37. int err;
  38. struct erase_info ei;
  39. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  40. memset(&ei, 0, sizeof(struct erase_info));
  41. ei.addr = addr;
  42. ei.len = mtd->erasesize * blocks;
  43. err = mtd_erase(mtd, &ei);
  44. if (err) {
  45. pr_err("error %d while erasing EB %d, blocks %d\n",
  46. err, ebnum, blocks);
  47. return err;
  48. }
  49. return 0;
  50. }
  51. static int write_eraseblock(int ebnum)
  52. {
  53. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  54. return mtdtest_write(mtd, addr, mtd->erasesize, iobuf);
  55. }
  56. static int write_eraseblock_by_page(int ebnum)
  57. {
  58. int i, err = 0;
  59. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  60. void *buf = iobuf;
  61. for (i = 0; i < pgcnt; i++) {
  62. err = mtdtest_write(mtd, addr, pgsize, buf);
  63. if (err)
  64. break;
  65. addr += pgsize;
  66. buf += pgsize;
  67. }
  68. return err;
  69. }
  70. static int write_eraseblock_by_2pages(int ebnum)
  71. {
  72. size_t sz = pgsize * 2;
  73. int i, n = pgcnt / 2, err = 0;
  74. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  75. void *buf = iobuf;
  76. for (i = 0; i < n; i++) {
  77. err = mtdtest_write(mtd, addr, sz, buf);
  78. if (err)
  79. return err;
  80. addr += sz;
  81. buf += sz;
  82. }
  83. if (pgcnt % 2)
  84. err = mtdtest_write(mtd, addr, pgsize, buf);
  85. return err;
  86. }
  87. static int read_eraseblock(int ebnum)
  88. {
  89. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  90. return mtdtest_read(mtd, addr, mtd->erasesize, iobuf);
  91. }
  92. static int read_eraseblock_by_page(int ebnum)
  93. {
  94. int i, err = 0;
  95. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  96. void *buf = iobuf;
  97. for (i = 0; i < pgcnt; i++) {
  98. err = mtdtest_read(mtd, addr, pgsize, buf);
  99. if (err)
  100. break;
  101. addr += pgsize;
  102. buf += pgsize;
  103. }
  104. return err;
  105. }
  106. static int read_eraseblock_by_2pages(int ebnum)
  107. {
  108. size_t sz = pgsize * 2;
  109. int i, n = pgcnt / 2, err = 0;
  110. loff_t addr = (loff_t)ebnum * mtd->erasesize;
  111. void *buf = iobuf;
  112. for (i = 0; i < n; i++) {
  113. err = mtdtest_read(mtd, addr, sz, buf);
  114. if (err)
  115. return err;
  116. addr += sz;
  117. buf += sz;
  118. }
  119. if (pgcnt % 2)
  120. err = mtdtest_read(mtd, addr, pgsize, buf);
  121. return err;
  122. }
  123. static inline void start_timing(void)
  124. {
  125. start = ktime_get();
  126. }
  127. static inline void stop_timing(void)
  128. {
  129. finish = ktime_get();
  130. }
  131. static long calc_speed(void)
  132. {
  133. uint64_t k;
  134. long ms;
  135. ms = ktime_ms_delta(finish, start);
  136. if (ms == 0)
  137. return 0;
  138. k = (uint64_t)goodebcnt * (mtd->erasesize / 1024) * 1000;
  139. do_div(k, ms);
  140. return k;
  141. }
  142. static int __init mtd_speedtest_init(void)
  143. {
  144. int err, i, blocks, j, k;
  145. long speed;
  146. uint64_t tmp;
  147. printk(KERN_INFO "\n");
  148. printk(KERN_INFO "=================================================\n");
  149. if (dev < 0) {
  150. pr_info("Please specify a valid mtd-device via module parameter\n");
  151. pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
  152. return -EINVAL;
  153. }
  154. if (count)
  155. pr_info("MTD device: %d count: %d\n", dev, count);
  156. else
  157. pr_info("MTD device: %d\n", dev);
  158. mtd = get_mtd_device(NULL, dev);
  159. if (IS_ERR(mtd)) {
  160. err = PTR_ERR(mtd);
  161. pr_err("error: cannot get MTD device\n");
  162. return err;
  163. }
  164. if (mtd->writesize == 1) {
  165. pr_info("not NAND flash, assume page size is 512 "
  166. "bytes.\n");
  167. pgsize = 512;
  168. } else
  169. pgsize = mtd->writesize;
  170. tmp = mtd->size;
  171. do_div(tmp, mtd->erasesize);
  172. ebcnt = tmp;
  173. pgcnt = mtd->erasesize / pgsize;
  174. pr_info("MTD device size %llu, eraseblock size %u, "
  175. "page size %u, count of eraseblocks %u, pages per "
  176. "eraseblock %u, OOB size %u\n",
  177. (unsigned long long)mtd->size, mtd->erasesize,
  178. pgsize, ebcnt, pgcnt, mtd->oobsize);
  179. if (count > 0 && count < ebcnt)
  180. ebcnt = count;
  181. err = -ENOMEM;
  182. iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
  183. if (!iobuf)
  184. goto out;
  185. prandom_bytes(iobuf, mtd->erasesize);
  186. bbt = kzalloc(ebcnt, GFP_KERNEL);
  187. if (!bbt)
  188. goto out;
  189. err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
  190. if (err)
  191. goto out;
  192. for (i = 0; i < ebcnt; i++) {
  193. if (!bbt[i])
  194. goodebcnt++;
  195. }
  196. err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
  197. if (err)
  198. goto out;
  199. /* Write all eraseblocks, 1 eraseblock at a time */
  200. pr_info("testing eraseblock write speed\n");
  201. start_timing();
  202. for (i = 0; i < ebcnt; ++i) {
  203. if (bbt[i])
  204. continue;
  205. err = write_eraseblock(i);
  206. if (err)
  207. goto out;
  208. err = mtdtest_relax();
  209. if (err)
  210. goto out;
  211. }
  212. stop_timing();
  213. speed = calc_speed();
  214. pr_info("eraseblock write speed is %ld KiB/s\n", speed);
  215. /* Read all eraseblocks, 1 eraseblock at a time */
  216. pr_info("testing eraseblock read speed\n");
  217. start_timing();
  218. for (i = 0; i < ebcnt; ++i) {
  219. if (bbt[i])
  220. continue;
  221. err = read_eraseblock(i);
  222. if (err)
  223. goto out;
  224. err = mtdtest_relax();
  225. if (err)
  226. goto out;
  227. }
  228. stop_timing();
  229. speed = calc_speed();
  230. pr_info("eraseblock read speed is %ld KiB/s\n", speed);
  231. err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
  232. if (err)
  233. goto out;
  234. /* Write all eraseblocks, 1 page at a time */
  235. pr_info("testing page write speed\n");
  236. start_timing();
  237. for (i = 0; i < ebcnt; ++i) {
  238. if (bbt[i])
  239. continue;
  240. err = write_eraseblock_by_page(i);
  241. if (err)
  242. goto out;
  243. err = mtdtest_relax();
  244. if (err)
  245. goto out;
  246. }
  247. stop_timing();
  248. speed = calc_speed();
  249. pr_info("page write speed is %ld KiB/s\n", speed);
  250. /* Read all eraseblocks, 1 page at a time */
  251. pr_info("testing page read speed\n");
  252. start_timing();
  253. for (i = 0; i < ebcnt; ++i) {
  254. if (bbt[i])
  255. continue;
  256. err = read_eraseblock_by_page(i);
  257. if (err)
  258. goto out;
  259. err = mtdtest_relax();
  260. if (err)
  261. goto out;
  262. }
  263. stop_timing();
  264. speed = calc_speed();
  265. pr_info("page read speed is %ld KiB/s\n", speed);
  266. err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
  267. if (err)
  268. goto out;
  269. /* Write all eraseblocks, 2 pages at a time */
  270. pr_info("testing 2 page write speed\n");
  271. start_timing();
  272. for (i = 0; i < ebcnt; ++i) {
  273. if (bbt[i])
  274. continue;
  275. err = write_eraseblock_by_2pages(i);
  276. if (err)
  277. goto out;
  278. err = mtdtest_relax();
  279. if (err)
  280. goto out;
  281. }
  282. stop_timing();
  283. speed = calc_speed();
  284. pr_info("2 page write speed is %ld KiB/s\n", speed);
  285. /* Read all eraseblocks, 2 pages at a time */
  286. pr_info("testing 2 page read speed\n");
  287. start_timing();
  288. for (i = 0; i < ebcnt; ++i) {
  289. if (bbt[i])
  290. continue;
  291. err = read_eraseblock_by_2pages(i);
  292. if (err)
  293. goto out;
  294. err = mtdtest_relax();
  295. if (err)
  296. goto out;
  297. }
  298. stop_timing();
  299. speed = calc_speed();
  300. pr_info("2 page read speed is %ld KiB/s\n", speed);
  301. /* Erase all eraseblocks */
  302. pr_info("Testing erase speed\n");
  303. start_timing();
  304. err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
  305. if (err)
  306. goto out;
  307. stop_timing();
  308. speed = calc_speed();
  309. pr_info("erase speed is %ld KiB/s\n", speed);
  310. /* Multi-block erase all eraseblocks */
  311. for (k = 1; k < 7; k++) {
  312. blocks = 1 << k;
  313. pr_info("Testing %dx multi-block erase speed\n",
  314. blocks);
  315. start_timing();
  316. for (i = 0; i < ebcnt; ) {
  317. for (j = 0; j < blocks && (i + j) < ebcnt; j++)
  318. if (bbt[i + j])
  319. break;
  320. if (j < 1) {
  321. i++;
  322. continue;
  323. }
  324. err = multiblock_erase(i, j);
  325. if (err)
  326. goto out;
  327. err = mtdtest_relax();
  328. if (err)
  329. goto out;
  330. i += j;
  331. }
  332. stop_timing();
  333. speed = calc_speed();
  334. pr_info("%dx multi-block erase speed is %ld KiB/s\n",
  335. blocks, speed);
  336. }
  337. pr_info("finished\n");
  338. out:
  339. kfree(iobuf);
  340. kfree(bbt);
  341. put_mtd_device(mtd);
  342. if (err)
  343. pr_info("error %d occurred\n", err);
  344. printk(KERN_INFO "=================================================\n");
  345. return err;
  346. }
  347. module_init(mtd_speedtest_init);
  348. static void __exit mtd_speedtest_exit(void)
  349. {
  350. return;
  351. }
  352. module_exit(mtd_speedtest_exit);
  353. MODULE_DESCRIPTION("Speed test module");
  354. MODULE_AUTHOR("Adrian Hunter");
  355. MODULE_LICENSE("GPL");