1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2007 Nokia Corporation
5 * Test read and write speed of a MTD device.
7 * Author: Adrian Hunter <adrian.hunter@nokia.com>
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
24 static int dev = -EINVAL;
25 module_param(dev, int, S_IRUGO);
26 MODULE_PARM_DESC(dev, "MTD device number to use");
29 module_param(count, int, S_IRUGO);
30 MODULE_PARM_DESC(count, "Maximum number of eraseblocks to use "
33 static struct mtd_info *mtd;
34 static unsigned char *iobuf;
35 static unsigned char *bbt;
41 static ktime_t start, finish;
43 static int multiblock_erase(int ebnum, int blocks)
47 loff_t addr = (loff_t)ebnum * mtd->erasesize;
49 memset(&ei, 0, sizeof(struct erase_info));
51 ei.len = mtd->erasesize * blocks;
53 err = mtd_erase(mtd, &ei);
55 pr_err("error %d while erasing EB %d, blocks %d\n",
63 static int write_eraseblock(int ebnum)
65 loff_t addr = (loff_t)ebnum * mtd->erasesize;
67 return mtdtest_write(mtd, addr, mtd->erasesize, iobuf);
70 static int write_eraseblock_by_page(int ebnum)
73 loff_t addr = (loff_t)ebnum * mtd->erasesize;
76 for (i = 0; i < pgcnt; i++) {
77 err = mtdtest_write(mtd, addr, pgsize, buf);
87 static int write_eraseblock_by_2pages(int ebnum)
89 size_t sz = pgsize * 2;
90 int i, n = pgcnt / 2, err = 0;
91 loff_t addr = (loff_t)ebnum * mtd->erasesize;
94 for (i = 0; i < n; i++) {
95 err = mtdtest_write(mtd, addr, sz, buf);
102 err = mtdtest_write(mtd, addr, pgsize, buf);
107 static int read_eraseblock(int ebnum)
109 loff_t addr = (loff_t)ebnum * mtd->erasesize;
111 return mtdtest_read(mtd, addr, mtd->erasesize, iobuf);
114 static int read_eraseblock_by_page(int ebnum)
117 loff_t addr = (loff_t)ebnum * mtd->erasesize;
120 for (i = 0; i < pgcnt; i++) {
121 err = mtdtest_read(mtd, addr, pgsize, buf);
131 static int read_eraseblock_by_2pages(int ebnum)
133 size_t sz = pgsize * 2;
134 int i, n = pgcnt / 2, err = 0;
135 loff_t addr = (loff_t)ebnum * mtd->erasesize;
138 for (i = 0; i < n; i++) {
139 err = mtdtest_read(mtd, addr, sz, buf);
146 err = mtdtest_read(mtd, addr, pgsize, buf);
151 static inline void start_timing(void)
156 static inline void stop_timing(void)
158 finish = ktime_get();
161 static long calc_speed(void)
166 ms = ktime_ms_delta(finish, start);
169 k = (uint64_t)goodebcnt * (mtd->erasesize / 1024) * 1000;
174 static int __init mtd_speedtest_init(void)
176 int err, i, blocks, j, k;
180 printk(KERN_INFO "\n");
181 printk(KERN_INFO "=================================================\n");
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");
190 pr_info("MTD device: %d count: %d\n", dev, count);
192 pr_info("MTD device: %d\n", dev);
194 mtd = get_mtd_device(NULL, dev);
197 pr_err("error: cannot get MTD device\n");
201 if (mtd->writesize == 1) {
202 pr_info("not NAND flash, assume page size is 512 "
206 pgsize = mtd->writesize;
209 do_div(tmp, mtd->erasesize);
211 pgcnt = mtd->erasesize / pgsize;
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);
219 if (count > 0 && count < ebcnt)
223 iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
227 prandom_bytes(iobuf, mtd->erasesize);
229 bbt = kzalloc(ebcnt, GFP_KERNEL);
232 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
235 for (i = 0; i < ebcnt; i++) {
240 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
244 /* Write all eraseblocks, 1 eraseblock at a time */
245 pr_info("testing eraseblock write speed\n");
247 for (i = 0; i < ebcnt; ++i) {
250 err = write_eraseblock(i);
254 err = mtdtest_relax();
259 speed = calc_speed();
260 pr_info("eraseblock write speed is %ld KiB/s\n", speed);
262 /* Read all eraseblocks, 1 eraseblock at a time */
263 pr_info("testing eraseblock read speed\n");
265 for (i = 0; i < ebcnt; ++i) {
268 err = read_eraseblock(i);
272 err = mtdtest_relax();
277 speed = calc_speed();
278 pr_info("eraseblock read speed is %ld KiB/s\n", speed);
280 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
284 /* Write all eraseblocks, 1 page at a time */
285 pr_info("testing page write speed\n");
287 for (i = 0; i < ebcnt; ++i) {
290 err = write_eraseblock_by_page(i);
294 err = mtdtest_relax();
299 speed = calc_speed();
300 pr_info("page write speed is %ld KiB/s\n", speed);
302 /* Read all eraseblocks, 1 page at a time */
303 pr_info("testing page read speed\n");
305 for (i = 0; i < ebcnt; ++i) {
308 err = read_eraseblock_by_page(i);
312 err = mtdtest_relax();
317 speed = calc_speed();
318 pr_info("page read speed is %ld KiB/s\n", speed);
320 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
324 /* Write all eraseblocks, 2 pages at a time */
325 pr_info("testing 2 page write speed\n");
327 for (i = 0; i < ebcnt; ++i) {
330 err = write_eraseblock_by_2pages(i);
334 err = mtdtest_relax();
339 speed = calc_speed();
340 pr_info("2 page write speed is %ld KiB/s\n", speed);
342 /* Read all eraseblocks, 2 pages at a time */
343 pr_info("testing 2 page read speed\n");
345 for (i = 0; i < ebcnt; ++i) {
348 err = read_eraseblock_by_2pages(i);
352 err = mtdtest_relax();
357 speed = calc_speed();
358 pr_info("2 page read speed is %ld KiB/s\n", speed);
360 /* Erase all eraseblocks */
361 pr_info("Testing erase speed\n");
363 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
367 speed = calc_speed();
368 pr_info("erase speed is %ld KiB/s\n", speed);
370 /* Multi-block erase all eraseblocks */
371 for (k = 1; k < 7; k++) {
373 pr_info("Testing %dx multi-block erase speed\n",
376 for (i = 0; i < ebcnt; ) {
377 for (j = 0; j < blocks && (i + j) < ebcnt; j++)
384 err = multiblock_erase(i, j);
388 err = mtdtest_relax();
395 speed = calc_speed();
396 pr_info("%dx multi-block erase speed is %ld KiB/s\n",
399 pr_info("finished\n");
405 pr_info("error %d occurred\n", err);
406 printk(KERN_INFO "=================================================\n");
409 module_init(mtd_speedtest_init);
411 static void __exit mtd_speedtest_exit(void)
415 module_exit(mtd_speedtest_exit);
417 MODULE_DESCRIPTION("Speed test module");
418 MODULE_AUTHOR("Adrian Hunter");
419 MODULE_LICENSE("GPL");