[linux-block.git] / drivers / mtd / tests / stresstest.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2006-2008 Nokia Corporation
 *
 * Test random reads, writes and erases on MTD device.
 *
 * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/random.h>

#include "mtd_test.h"

static int dev = -EINVAL;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");

static int count = 10000;
module_param(count, int, S_IRUGO);
MODULE_PARM_DESC(count, "Number of operations to do (default is 10000)");

static struct mtd_info *mtd;
static unsigned char *writebuf;
static unsigned char *readbuf;
static unsigned char *bbt;
static int *offsets;

static int pgsize;
static int bufsize;
static int ebcnt;
static int pgcnt;

static int rand_eb(void)
{
	unsigned int eb;

again:
	/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
	eb = prandom_u32_max(ebcnt - 1);
	if (bbt[eb])
		goto again;
	return eb;
}

static int rand_offs(void)
{
	return prandom_u32_max(bufsize);
}

static int rand_len(int offs)
{
	return prandom_u32_max(bufsize - offs);
}

static int do_read(void)
{
	int eb = rand_eb();
	int offs = rand_offs();
	int len = rand_len(offs);
	loff_t addr;

	if (bbt[eb + 1]) {
		if (offs >= mtd->erasesize)
			offs -= mtd->erasesize;
		if (offs + len > mtd->erasesize)
			len = mtd->erasesize - offs;
	}
	addr = (loff_t)eb * mtd->erasesize + offs;
	return mtdtest_read(mtd, addr, len, readbuf);
}

static int do_write(void)
{
	int eb = rand_eb(), offs, err, len;
	loff_t addr;

	offs = offsets[eb];
	if (offs >= mtd->erasesize) {
		err = mtdtest_erase_eraseblock(mtd, eb);
		if (err)
			return err;
		offs = offsets[eb] = 0;
	}
	len = rand_len(offs);
	len = ((len + pgsize - 1) / pgsize) * pgsize;
	if (offs + len > mtd->erasesize) {
		if (bbt[eb + 1])
			len = mtd->erasesize - offs;
		else {
			err = mtdtest_erase_eraseblock(mtd, eb + 1);
			if (err)
				return err;
			offsets[eb + 1] = 0;
		}
	}
	addr = (loff_t)eb * mtd->erasesize + offs;
	err = mtdtest_write(mtd, addr, len, writebuf);
	if (unlikely(err))
		return err;
	offs += len;
	while (offs > mtd->erasesize) {
		offsets[eb++] = mtd->erasesize;
		offs -= mtd->erasesize;
	}
	offsets[eb] = offs;
	return 0;
}

static int do_operation(void)
{
	if (prandom_u32_max(2))
		return do_read();
	else
		return do_write();
}

static int __init mtd_stresstest_init(void)
{
	int err;
	int i, op;
	uint64_t tmp;

	printk(KERN_INFO "\n");
	printk(KERN_INFO "=================================================\n");

	if (dev < 0) {
		pr_info("Please specify a valid mtd-device via module parameter\n");
		pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
		return -EINVAL;
	}

	pr_info("MTD device: %d\n", dev);

	mtd = get_mtd_device(NULL, dev);
	if (IS_ERR(mtd)) {
		err = PTR_ERR(mtd);
		pr_err("error: cannot get MTD device\n");
		return err;
	}

	if (mtd->writesize == 1) {
		pr_info("not NAND flash, assume page size is 512 "
		       "bytes.\n");
		pgsize = 512;
	} else
		pgsize = mtd->writesize;

	tmp = mtd->size;
	do_div(tmp, mtd->erasesize);
	ebcnt = tmp;
	pgcnt = mtd->erasesize / pgsize;

	pr_info("MTD device size %llu, eraseblock size %u, "
	       "page size %u, count of eraseblocks %u, pages per "
	       "eraseblock %u, OOB size %u\n",
	       (unsigned long long)mtd->size, mtd->erasesize,
	       pgsize, ebcnt, pgcnt, mtd->oobsize);

	if (ebcnt < 2) {
		pr_err("error: need at least 2 eraseblocks\n");
		err = -ENOSPC;
		goto out_put_mtd;
	}

	/* Read or write up 2 eraseblocks at a time */
	bufsize = mtd->erasesize * 2;

	err = -ENOMEM;
	readbuf = vmalloc(bufsize);
	writebuf = vmalloc(bufsize);
	offsets = kmalloc_array(ebcnt, sizeof(int), GFP_KERNEL);
	if (!readbuf || !writebuf || !offsets)
		goto out;
	for (i = 0; i < ebcnt; i++)
		offsets[i] = mtd->erasesize;
	get_random_bytes(writebuf, bufsize);

	bbt = kzalloc(ebcnt, GFP_KERNEL);
	if (!bbt)
		goto out;
	err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
	if (err)
		goto out;

	/* Do operations */
	pr_info("doing operations\n");
	for (op = 0; op < count; op++) {
		if ((op & 1023) == 0)
			pr_info("%d operations done\n", op);
		err = do_operation();
		if (err)
			goto out;

		err = mtdtest_relax();
		if (err)
			goto out;
	}
	pr_info("finished, %d operations done\n", op);

out:
	kfree(offsets);
	kfree(bbt);
	vfree(writebuf);
	vfree(readbuf);
out_put_mtd:
	put_mtd_device(mtd);
	if (err)
		pr_info("error %d occurred\n", err);
	printk(KERN_INFO "=================================================\n");
	return err;
}
module_init(mtd_stresstest_init);

static void __exit mtd_stresstest_exit(void)
{
	return;
}
module_exit(mtd_stresstest_exit);

MODULE_DESCRIPTION("Stress test module");
MODULE_AUTHOR("Adrian Hunter");
MODULE_LICENSE("GPL");
Commit	Line	Data
4cd10358	1	// SPDX-License-Identifier: GPL-2.0-only
7163cea1 AB	2	/*
	3	* Copyright (C) 2006-2008 Nokia Corporation
	4	*
7163cea1 AB	5	* Test random reads, writes and erases on MTD device.
	6	*
	7	* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
	8	*/
	9
ae0086cf VN	10	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
ae0086cf VN	11
7163cea1 AB	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/moduleparam.h>
	15	#include <linux/err.h>
	16	#include <linux/mtd/mtd.h>
5a0e3ad6	17	#include <linux/slab.h>
7163cea1 AB	18	#include <linux/sched.h>
7163cea1 AB	19	#include <linux/vmalloc.h>
bfea1d4e	20	#include <linux/random.h>
7163cea1	21
5a78df69 AM	22	#include "mtd_test.h"
5a78df69 AM	23
7406060e	24	static int dev = -EINVAL;
7163cea1 AB	25	module_param(dev, int, S_IRUGO);
	26	MODULE_PARM_DESC(dev, "MTD device number to use");
	27
	28	static int count = 10000;
	29	module_param(count, int, S_IRUGO);
	30	MODULE_PARM_DESC(count, "Number of operations to do (default is 10000)");
	31
	32	static struct mtd_info *mtd;
	33	static unsigned char *writebuf;
	34	static unsigned char *readbuf;
	35	static unsigned char *bbt;
	36	static int *offsets;
	37
	38	static int pgsize;
	39	static int bufsize;
	40	static int ebcnt;
	41	static int pgcnt;
7163cea1 AB	42
	43	static int rand_eb(void)
	44	{
bfea1d4e	45	unsigned int eb;
7163cea1 AB	46
7163cea1 AB	47	again:
7163cea1	48	/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
81895a65	49	eb = prandom_u32_max(ebcnt - 1);
7163cea1 AB	50	if (bbt[eb])
	51	goto again;
	52	return eb;
	53	}
	54
	55	static int rand_offs(void)
	56	{
81895a65	57	return prandom_u32_max(bufsize);
7163cea1 AB	58	}
	59
	60	static int rand_len(int offs)
	61	{
81895a65	62	return prandom_u32_max(bufsize - offs);
7163cea1 AB	63	}
7163cea1 AB	64
7163cea1 AB	65	static int do_read(void)
7163cea1 AB	66	{
7163cea1 AB	67	int eb = rand_eb();
7163cea1 AB	68	int offs = rand_offs();
abc173ad	69	int len = rand_len(offs);
7163cea1 AB	70	loff_t addr;
	71
	72	if (bbt[eb + 1]) {
	73	if (offs >= mtd->erasesize)
	74	offs -= mtd->erasesize;
	75	if (offs + len > mtd->erasesize)
	76	len = mtd->erasesize - offs;
	77	}
b9da8bae	78	addr = (loff_t)eb * mtd->erasesize + offs;
abc173ad	79	return mtdtest_read(mtd, addr, len, readbuf);
7163cea1 AB	80	}
	81
	82	static int do_write(void)
	83	{
	84	int eb = rand_eb(), offs, err, len;
7163cea1 AB	85	loff_t addr;
	86
	87	offs = offsets[eb];
	88	if (offs >= mtd->erasesize) {
5a78df69	89	err = mtdtest_erase_eraseblock(mtd, eb);
7163cea1 AB	90	if (err)
	91	return err;
	92	offs = offsets[eb] = 0;
	93	}
	94	len = rand_len(offs);
	95	len = ((len + pgsize - 1) / pgsize) * pgsize;
	96	if (offs + len > mtd->erasesize) {
	97	if (bbt[eb + 1])
	98	len = mtd->erasesize - offs;
	99	else {
5a78df69	100	err = mtdtest_erase_eraseblock(mtd, eb + 1);
7163cea1 AB	101	if (err)
	102	return err;
	103	offsets[eb + 1] = 0;
	104	}
	105	}
b9da8bae	106	addr = (loff_t)eb * mtd->erasesize + offs;
5a78df69	107	err = mtdtest_write(mtd, addr, len, writebuf);
8a9f4aa3	108	if (unlikely(err))
7163cea1	109	return err;
7163cea1 AB	110	offs += len;
	111	while (offs > mtd->erasesize) {
	112	offsets[eb++] = mtd->erasesize;
	113	offs -= mtd->erasesize;
	114	}
	115	offsets[eb] = offs;
	116	return 0;
	117	}
	118
	119	static int do_operation(void)
	120	{
81895a65	121	if (prandom_u32_max(2))
7163cea1 AB	122	return do_read();
	123	else
	124	return do_write();
	125	}
	126
7163cea1 AB	127	static int __init mtd_stresstest_init(void)
	128	{
	129	int err;
	130	int i, op;
	131	uint64_t tmp;
	132
	133	printk(KERN_INFO "\n");
	134	printk(KERN_INFO "=================================================\n");
7406060e WS	135
7406060e WS	136	if (dev < 0) {
064a7694	137	pr_info("Please specify a valid mtd-device via module parameter\n");
ae0086cf	138	pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
7406060e WS	139	return -EINVAL;
	140	}
	141
ae0086cf	142	pr_info("MTD device: %d\n", dev);
7163cea1 AB	143
	144	mtd = get_mtd_device(NULL, dev);
	145	if (IS_ERR(mtd)) {
	146	err = PTR_ERR(mtd);
ae0086cf	147	pr_err("error: cannot get MTD device\n");
7163cea1 AB	148	return err;
	149	}
	150
	151	if (mtd->writesize == 1) {
ae0086cf	152	pr_info("not NAND flash, assume page size is 512 "
7163cea1 AB	153	"bytes.\n");
	154	pgsize = 512;
	155	} else
	156	pgsize = mtd->writesize;
	157
	158	tmp = mtd->size;
	159	do_div(tmp, mtd->erasesize);
	160	ebcnt = tmp;
f5e2bae0	161	pgcnt = mtd->erasesize / pgsize;
7163cea1	162
ae0086cf	163	pr_info("MTD device size %llu, eraseblock size %u, "
7163cea1 AB	164	"page size %u, count of eraseblocks %u, pages per "
	165	"eraseblock %u, OOB size %u\n",
	166	(unsigned long long)mtd->size, mtd->erasesize,
	167	pgsize, ebcnt, pgcnt, mtd->oobsize);
	168
2f4478cc	169	if (ebcnt < 2) {
ae0086cf	170	pr_err("error: need at least 2 eraseblocks\n");
2f4478cc WS	171	err = -ENOSPC;
	172	goto out_put_mtd;
	173	}
	174
7163cea1 AB	175	/* Read or write up 2 eraseblocks at a time */
	176	bufsize = mtd->erasesize * 2;
	177
	178	err = -ENOMEM;
	179	readbuf = vmalloc(bufsize);
	180	writebuf = vmalloc(bufsize);
6da2ec56	181	offsets = kmalloc_array(ebcnt, sizeof(int), GFP_KERNEL);
33777e66	182	if (!readbuf \|\| !writebuf \|\| !offsets)
7163cea1	183	goto out;
7163cea1 AB	184	for (i = 0; i < ebcnt; i++)
7163cea1 AB	185	offsets[i] = mtd->erasesize;
197173db	186	get_random_bytes(writebuf, bufsize);
7163cea1	187
5a78df69 AM	188	bbt = kzalloc(ebcnt, GFP_KERNEL);
	189	if (!bbt)
	190	goto out;
	191	err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
7163cea1 AB	192	if (err)
	193	goto out;
	194
	195	/* Do operations */
ae0086cf	196	pr_info("doing operations\n");
7163cea1 AB	197	for (op = 0; op < count; op++) {
7163cea1 AB	198	if ((op & 1023) == 0)
ae0086cf	199	pr_info("%d operations done\n", op);
7163cea1 AB	200	err = do_operation();
	201	if (err)
	202	goto out;
2a6a28e7 RW	203
	204	err = mtdtest_relax();
	205	if (err)
	206	goto out;
7163cea1	207	}
ae0086cf	208	pr_info("finished, %d operations done\n", op);
7163cea1 AB	209
	210	out:
	211	kfree(offsets);
	212	kfree(bbt);
	213	vfree(writebuf);
	214	vfree(readbuf);
2f4478cc	215	out_put_mtd:
7163cea1 AB	216	put_mtd_device(mtd);
7163cea1 AB	217	if (err)
ae0086cf	218	pr_info("error %d occurred\n", err);
7163cea1 AB	219	printk(KERN_INFO "=================================================\n");
	220	return err;
	221	}
	222	module_init(mtd_stresstest_init);
	223
	224	static void __exit mtd_stresstest_exit(void)
	225	{
	226	return;
	227	}
	228	module_exit(mtd_stresstest_exit);
	229
	230	MODULE_DESCRIPTION("Stress test module");
	231	MODULE_AUTHOR("Adrian Hunter");
	232	MODULE_LICENSE("GPL");