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Commit e73f2174 authored by Artem Bityutskiy's avatar Artem Bityutskiy
Browse files

MTD: tests: add mtd_pagetest 



This test checks that NAND pages read/write work fine.

Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent e3644da7

drivers/mtd/tests/mtd_pagetest.c

0 → 100644
+632 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2006-2008 Nokia Corporation

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along with

 * this program; see the file COPYING. If not, write to the Free Software

 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 *

 * Test page read and write on MTD device.

 *

 * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>

 */



#include <asm/div64.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/err.h>

#include <linux/mtd/mtd.h>

#include <linux/sched.h>



#define PRINT_PREF KERN_INFO "mtd_pagetest: "



static int dev;

module_param(dev, int, S_IRUGO);

MODULE_PARM_DESC(dev, "MTD device number to use");



static struct mtd_info *mtd;

static unsigned char *twopages;

static unsigned char *writebuf;

static unsigned char *boundary;

static unsigned char *bbt;



static int pgsize;

static int bufsize;

static int ebcnt;

static int pgcnt;

static int errcnt;

static unsigned long next = 1;



static inline unsigned int simple_rand(void)

{

	next = next * 1103515245 + 12345;

	return (unsigned int)((next / 65536) % 32768);

}



static inline void simple_srand(unsigned long seed)

{

	next = seed;

}



static void set_random_data(unsigned char *buf, size_t len)

{

	size_t i;



	for (i = 0; i < len; ++i)

		buf[i] = simple_rand();

}



static int erase_eraseblock(int ebnum)

{

	int err;

	struct erase_info ei;

	loff_t addr = ebnum * mtd->erasesize;



	memset(&ei, 0, sizeof(struct erase_info));

	ei.mtd  = mtd;

	ei.addr = addr;

	ei.len  = mtd->erasesize;



	err = mtd->erase(mtd, &ei);

	if (err) {

		printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);

		return err;

	}



	if (ei.state == MTD_ERASE_FAILED) {

		printk(PRINT_PREF "some erase error occurred at EB %d\n",

		       ebnum);

		return -EIO;

	}



	return 0;

}



static int write_eraseblock(int ebnum)

{

	int err = 0;

	size_t written = 0;

	loff_t addr = ebnum * mtd->erasesize;



	set_random_data(writebuf, mtd->erasesize);

	cond_resched();

	err = mtd->write(mtd, addr, mtd->erasesize, &written, writebuf);

	if (err || written != mtd->erasesize)

		printk(PRINT_PREF "error: write failed at %#llx\n",

		       (long long)addr);



	return err;

}



static int verify_eraseblock(int ebnum)

{

	uint32_t j;

	size_t read = 0;

	int err = 0, i;

	loff_t addr0, addrn;

	loff_t addr = ebnum * mtd->erasesize;



	addr0 = 0;

	for (i = 0; bbt[i] && i < ebcnt; ++i)

		addr0 += mtd->erasesize;



	addrn = mtd->size;

	for (i = 0; bbt[ebcnt - i - 1] && i < ebcnt; ++i)

		addrn -= mtd->erasesize;



	set_random_data(writebuf, mtd->erasesize);

	for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {

		/* Do a read to set the internal dataRAMs to different data */

		err = mtd->read(mtd, addr0, bufsize, &read, twopages);

		if (err == -EUCLEAN)

			err = 0;

		if (err || read != bufsize) {

			printk(PRINT_PREF "error: read failed at %#llx\n",

			       (long long)addr0);

			return err;

		}

		err = mtd->read(mtd, addrn - bufsize, bufsize, &read, twopages);

		if (err == -EUCLEAN)

			err = 0;

		if (err || read != bufsize) {

			printk(PRINT_PREF "error: read failed at %#llx\n",

			       (long long)(addrn - bufsize));

			return err;

		}

		memset(twopages, 0, bufsize);

		read = 0;

		err = mtd->read(mtd, addr, bufsize, &read, twopages);

		if (err == -EUCLEAN)

			err = 0;

		if (err || read != bufsize) {

			printk(PRINT_PREF "error: read failed at %#llx\n",

			       (long long)addr);

			break;

		}

		if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) {

			printk(PRINT_PREF "error: verify failed at %#llx\n",

			       (long long)addr);

			errcnt += 1;

		}

	}

	/* Check boundary between eraseblocks */

	if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) {

		unsigned long oldnext = next;

		/* Do a read to set the internal dataRAMs to different data */

		err = mtd->read(mtd, addr0, bufsize, &read, twopages);

		if (err == -EUCLEAN)

			err = 0;

		if (err || read != bufsize) {

			printk(PRINT_PREF "error: read failed at %#llx\n",

			       (long long)addr0);

			return err;

		}

		err = mtd->read(mtd, addrn - bufsize, bufsize, &read, twopages);

		if (err == -EUCLEAN)

			err = 0;

		if (err || read != bufsize) {

			printk(PRINT_PREF "error: read failed at %#llx\n",

			       (long long)(addrn - bufsize));

			return err;

		}

		memset(twopages, 0, bufsize);

		read = 0;

		err = mtd->read(mtd, addr, bufsize, &read, twopages);

		if (err == -EUCLEAN)

			err = 0;

		if (err || read != bufsize) {

			printk(PRINT_PREF "error: read failed at %#llx\n",

			       (long long)addr);

			return err;

		}

		memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);

		set_random_data(boundary + pgsize, pgsize);

		if (memcmp(twopages, boundary, bufsize)) {

			printk(PRINT_PREF "error: verify failed at %#llx\n",

			       (long long)addr);

			errcnt += 1;

		}

		next = oldnext;

	}

	return err;

}



static int crosstest(void)

{

	size_t read = 0;

	int err = 0, i;

	loff_t addr, addr0, addrn;

	unsigned char *pp1, *pp2, *pp3, *pp4;



	printk(PRINT_PREF "crosstest\n");

	pp1 = kmalloc(pgsize * 4, GFP_KERNEL);

	if (!pp1) {

		printk(PRINT_PREF "error: cannot allocate memory\n");

		return -ENOMEM;

	}

	pp2 = pp1 + pgsize;

	pp3 = pp2 + pgsize;

	pp4 = pp3 + pgsize;

	memset(pp1, 0, pgsize * 4);



	addr0 = 0;

	for (i = 0; bbt[i] && i < ebcnt; ++i)

		addr0 += mtd->erasesize;



	addrn = mtd->size;

	for (i = 0; bbt[ebcnt - i - 1] && i < ebcnt; ++i)

		addrn -= mtd->erasesize;



	/* Read 2nd-to-last page to pp1 */

	read = 0;

	addr = addrn - pgsize - pgsize;

	err = mtd->read(mtd, addr, pgsize, &read, pp1);

	if (err == -EUCLEAN)

		err = 0;

	if (err || read != pgsize) {

		printk(PRINT_PREF "error: read failed at %#llx\n",

		       (long long)addr);

		kfree(pp1);

		return err;

	}



	/* Read 3rd-to-last page to pp1 */

	read = 0;

	addr = addrn - pgsize - pgsize - pgsize;

	err = mtd->read(mtd, addr, pgsize, &read, pp1);

	if (err == -EUCLEAN)

		err = 0;

	if (err || read != pgsize) {

		printk(PRINT_PREF "error: read failed at %#llx\n",

		       (long long)addr);

		kfree(pp1);

		return err;

	}



	/* Read first page to pp2 */

	read = 0;

	addr = addr0;

	printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);

	err = mtd->read(mtd, addr, pgsize, &read, pp2);

	if (err == -EUCLEAN)

		err = 0;

	if (err || read != pgsize) {

		printk(PRINT_PREF "error: read failed at %#llx\n",

		       (long long)addr);

		kfree(pp1);

		return err;

	}



	/* Read last page to pp3 */

	read = 0;

	addr = addrn - pgsize;

	printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);

	err = mtd->read(mtd, addr, pgsize, &read, pp3);

	if (err == -EUCLEAN)

		err = 0;

	if (err || read != pgsize) {

		printk(PRINT_PREF "error: read failed at %#llx\n",

		       (long long)addr);

		kfree(pp1);

		return err;

	}



	/* Read first page again to pp4 */

	read = 0;

	addr = addr0;

	printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);

	err = mtd->read(mtd, addr, pgsize, &read, pp4);

	if (err == -EUCLEAN)

		err = 0;

	if (err || read != pgsize) {

		printk(PRINT_PREF "error: read failed at %#llx\n",

		       (long long)addr);

		kfree(pp1);

		return err;

	}



	/* pp2 and pp4 should be the same */

	printk(PRINT_PREF "verifying pages read at %#llx match\n",

	       (long long)addr0);

	if (memcmp(pp2, pp4, pgsize)) {

		printk(PRINT_PREF "verify failed!\n");

		errcnt += 1;

	} else if (!err)

		printk(PRINT_PREF "crosstest ok\n");

	kfree(pp1);

	return err;

}



static int erasecrosstest(void)

{

	size_t read = 0, written = 0;

	int err = 0, i, ebnum, ok = 1, ebnum2;

	loff_t addr0;

	char *readbuf = twopages;



	printk(PRINT_PREF "erasecrosstest\n");



	ebnum = 0;

	addr0 = 0;

	for (i = 0; bbt[i] && i < ebcnt; ++i) {

		addr0 += mtd->erasesize;

		ebnum += 1;

	}



	ebnum2 = ebcnt - 1;

	while (ebnum2 && bbt[ebnum2])

		ebnum2 -= 1;



	printk(PRINT_PREF "erasing block %d\n", ebnum);

	err = erase_eraseblock(ebnum);

	if (err)

		return err;



	printk(PRINT_PREF "writing 1st page of block %d\n", ebnum);

	set_random_data(writebuf, pgsize);

	strcpy(writebuf, "There is no data like this!");

	err = mtd->write(mtd, addr0, pgsize, &written, writebuf);

	if (err || written != pgsize) {

		printk(PRINT_PREF "error: write failed at %#llx\n",

		       (long long)addr0);

		return err ? err : -1;

	}



	printk(PRINT_PREF "reading 1st page of block %d\n", ebnum);

	memset(readbuf, 0, pgsize);

	err = mtd->read(mtd, addr0, pgsize, &read, readbuf);

	if (err == -EUCLEAN)

		err = 0;

	if (err || read != pgsize) {

		printk(PRINT_PREF "error: read failed at %#llx\n",

		       (long long)addr0);

		return err ? err : -1;

	}



	printk(PRINT_PREF "verifying 1st page of block %d\n", ebnum);

	if (memcmp(writebuf, readbuf, pgsize)) {

		printk(PRINT_PREF "verify failed!\n");

		errcnt += 1;

		ok = 0;

		return err;

	}



	printk(PRINT_PREF "erasing block %d\n", ebnum);

	err = erase_eraseblock(ebnum);

	if (err)

		return err;



	printk(PRINT_PREF "writing 1st page of block %d\n", ebnum);

	set_random_data(writebuf, pgsize);

	strcpy(writebuf, "There is no data like this!");

	err = mtd->write(mtd, addr0, pgsize, &written, writebuf);

	if (err || written != pgsize) {

		printk(PRINT_PREF "error: write failed at %#llx\n",

		       (long long)addr0);

		return err ? err : -1;

	}



	printk(PRINT_PREF "erasing block %d\n", ebnum2);

	err = erase_eraseblock(ebnum2);

	if (err)

		return err;



	printk(PRINT_PREF "reading 1st page of block %d\n", ebnum);

	memset(readbuf, 0, pgsize);

	err = mtd->read(mtd, addr0, pgsize, &read, readbuf);

	if (err == -EUCLEAN)

		err = 0;

	if (err || read != pgsize) {

		printk(PRINT_PREF "error: read failed at %#llx\n",

		       (long long)addr0);

		return err ? err : -1;

	}



	printk(PRINT_PREF "verifying 1st page of block %d\n", ebnum);

	if (memcmp(writebuf, readbuf, pgsize)) {

		printk(PRINT_PREF "verify failed!\n");

		errcnt += 1;

		ok = 0;

	}



	if (ok && !err)

		printk(PRINT_PREF "erasecrosstest ok\n");

	return err;

}



static int erasetest(void)

{

	size_t read = 0, written = 0;

	int err = 0, i, ebnum, ok = 1;

	loff_t addr0;



	printk(PRINT_PREF "erasetest\n");



	ebnum = 0;

	addr0 = 0;

	for (i = 0; bbt[i] && i < ebcnt; ++i) {

		addr0 += mtd->erasesize;

		ebnum += 1;

	}



	printk(PRINT_PREF "erasing block %d\n", ebnum);

	err = erase_eraseblock(ebnum);

	if (err)

		return err;



	printk(PRINT_PREF "writing 1st page of block %d\n", ebnum);

	set_random_data(writebuf, pgsize);

	err = mtd->write(mtd, addr0, pgsize, &written, writebuf);

	if (err || written != pgsize) {

		printk(PRINT_PREF "error: write failed at %#llx\n",

		       (long long)addr0);

		return err ? err : -1;

	}



	printk(PRINT_PREF "erasing block %d\n", ebnum);

	err = erase_eraseblock(ebnum);

	if (err)

		return err;



	printk(PRINT_PREF "reading 1st page of block %d\n", ebnum);

	err = mtd->read(mtd, addr0, pgsize, &read, twopages);

	if (err == -EUCLEAN)

		err = 0;

	if (err || read != pgsize) {

		printk(PRINT_PREF "error: read failed at %#llx\n",

		       (long long)addr0);

		return err ? err : -1;

	}



	printk(PRINT_PREF "verifying 1st page of block %d is all 0xff\n",

	       ebnum);

	for (i = 0; i < pgsize; ++i)

		if (twopages[i] != 0xff) {

			printk(PRINT_PREF "verifying all 0xff failed at %d\n",

			       i);

			errcnt += 1;

			ok = 0;

			break;

		}



	if (ok && !err)

		printk(PRINT_PREF "erasetest ok\n");



	return err;

}



static int is_block_bad(int ebnum)

{

	loff_t addr = ebnum * mtd->erasesize;

	int ret;



	ret = mtd->block_isbad(mtd, addr);

	if (ret)

		printk(PRINT_PREF "block %d is bad\n", ebnum);

	return ret;

}



static int scan_for_bad_eraseblocks(void)

{

	int i, bad = 0;



	bbt = kmalloc(ebcnt, GFP_KERNEL);

	if (!bbt) {

		printk(PRINT_PREF "error: cannot allocate memory\n");

		return -ENOMEM;

	}

	memset(bbt, 0 , ebcnt);



	printk(PRINT_PREF "scanning for bad eraseblocks\n");

	for (i = 0; i < ebcnt; ++i) {

		bbt[i] = is_block_bad(i) ? 1 : 0;

		if (bbt[i])

			bad += 1;

		cond_resched();

	}

	printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);

	return 0;

}



static int __init mtd_pagetest_init(void)

{

	int err = 0;

	uint64_t tmp;

	uint32_t i;



	printk(KERN_INFO "\n");

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

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



	mtd = get_mtd_device(NULL, dev);

	if (IS_ERR(mtd)) {

		err = PTR_ERR(mtd);

		printk(PRINT_PREF "error: cannot get MTD device\n");

		return err;

	}



	if (mtd->type != MTD_NANDFLASH) {

		printk(PRINT_PREF "this test requires NAND flash\n");

		goto out;

	}



	tmp = mtd->size;

	do_div(tmp, mtd->erasesize);

	ebcnt = tmp;

	pgcnt = mtd->erasesize / mtd->writesize;



	printk(PRINT_PREF "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);



	err = -ENOMEM;

	bufsize = pgsize * 2;

	writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);

	if (!writebuf) {

		printk(PRINT_PREF "error: cannot allocate memory\n");

		goto out;

	}

	twopages = kmalloc(bufsize, GFP_KERNEL);

	if (!twopages) {

		printk(PRINT_PREF "error: cannot allocate memory\n");

		goto out;

	}

	boundary = kmalloc(bufsize, GFP_KERNEL);

	if (!boundary) {

		printk(PRINT_PREF "error: cannot allocate memory\n");

		goto out;

	}



	err = scan_for_bad_eraseblocks();

	if (err)

		goto out;



	/* Erase all eraseblocks */

	printk(PRINT_PREF "erasing whole device\n");

	for (i = 0; i < ebcnt; ++i) {

		if (bbt[i])

			continue;

		err = erase_eraseblock(i);

		if (err)

			goto out;

		cond_resched();

	}

	printk(PRINT_PREF "erased %u eraseblocks\n", i);



	/* Write all eraseblocks */

	simple_srand(1);

	printk(PRINT_PREF "writing whole device\n");

	for (i = 0; i < ebcnt; ++i) {

		if (bbt[i])

			continue;

		err = write_eraseblock(i);

		if (err)

			goto out;

		if (i % 256 == 0)

			printk(PRINT_PREF "written up to eraseblock %u\n", i);

		cond_resched();

	}

	printk(PRINT_PREF "written %u eraseblocks\n", i);



	/* Check all eraseblocks */

	simple_srand(1);

	printk(PRINT_PREF "verifying all eraseblocks\n");

	for (i = 0; i < ebcnt; ++i) {

		if (bbt[i])

			continue;

		err = verify_eraseblock(i);

		if (err)

			goto out;

		if (i % 256 == 0)

			printk(PRINT_PREF "verified up to eraseblock %u\n", i);

		cond_resched();

	}

	printk(PRINT_PREF "verified %u eraseblocks\n", i);



	err = crosstest();

	if (err)

		goto out;



	err = erasecrosstest();

	if (err)

		goto out;



	err = erasetest();

	if (err)

		goto out;



	printk(PRINT_PREF "finished with %d errors\n", errcnt);

out:



	kfree(bbt);

	kfree(boundary);

	kfree(twopages);

	kfree(writebuf);

	put_mtd_device(mtd);

	if (err)

		printk(PRINT_PREF "error %d occurred\n", err);

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

	return err;

}

module_init(mtd_pagetest_init);



static void __exit mtd_pagetest_exit(void)

{

	return;

}

module_exit(mtd_pagetest_exit);



MODULE_DESCRIPTION("NAND page test");

MODULE_AUTHOR("Adrian Hunter");

MODULE_LICENSE("GPL");