Merge branch 'master' of git://git.infradead.org/users/dedekind/mtd-tests-2.6

Conflicts:
	drivers/mtd/Makefile

drivers/mtd/Kconfig

@@ -45,6 +45,14 @@ config MTD_PARTITIONS
 	  devices. Partitioning on NFTL 'devices' is a different - that's the
 	  'normal' form of partitioning used on a block device.
 
+config MTD_TESTS
+	tristate "MTD tests support"
+	depends on m
+	help
+	  This option includes various MTD tests into compilation. The tests
+	  should normally be compiled as kernel modules. The modules perform
+	  various checks and verifications when loaded.
+
 config MTD_REDBOOT_PARTS
 	tristate "RedBoot partition table parsing"
 	depends on MTD_PARTITIONS

drivers/mtd/Makefile

@@ -29,6 +29,6 @@ obj-$(CONFIG_MTD_OOPS)		+= mtdoops.o
 nftl-objs		:= nftlcore.o nftlmount.o
 inftl-objs		:= inftlcore.o inftlmount.o
 
-obj-y		+= chips/ lpddr/ maps/ devices/ nand/ onenand/ 
+obj-y		+= chips/ lpddr/ maps/ devices/ nand/ onenand/ tests/
 
 obj-$(CONFIG_MTD_UBI)		+= ubi/

drivers/mtd/tests/Makefile

+obj-$(CONFIG_MTD_TESTS) += mtd_oobtest.o
+obj-$(CONFIG_MTD_TESTS) += mtd_pagetest.o
+obj-$(CONFIG_MTD_TESTS) += mtd_readtest.o
+obj-$(CONFIG_MTD_TESTS) += mtd_speedtest.o
+obj-$(CONFIG_MTD_TESTS) += mtd_stresstest.o
+obj-$(CONFIG_MTD_TESTS) += mtd_subpagetest.o
+obj-$(CONFIG_MTD_TESTS) += mtd_torturetest.o

drivers/mtd/tests/mtd_oobtest.c

+/*
+ * 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 OOB 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_oobtest: "
+
+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 *readbuf;
+static unsigned char *writebuf;
+static unsigned char *bbt;
+
+static int ebcnt;
+static int pgcnt;
+static int errcnt;
+static int use_offset;
+static int use_len;
+static int use_len_max;
+static int vary_offset;
+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 erase_whole_device(void)
+{
+	int err;
+	unsigned int i;
+
+	printk(PRINT_PREF "erasing whole device\n");
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = erase_eraseblock(i);
+		if (err)
+			return err;
+		cond_resched();
+	}
+	printk(PRINT_PREF "erased %u eraseblocks\n", i);
+	return 0;
+}
+
+static void do_vary_offset(void)
+{
+	use_len -= 1;
+	if (use_len < 1) {
+		use_offset += 1;
+		if (use_offset >= use_len_max)
+			use_offset = 0;
+		use_len = use_len_max - use_offset;
+	}
+}
+
+static int write_eraseblock(int ebnum)
+{
+	int i;
+	struct mtd_oob_ops ops;
+	int err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
+		set_random_data(writebuf, use_len);
+		ops.mode      = MTD_OOB_AUTO;
+		ops.len       = 0;
+		ops.retlen    = 0;
+		ops.ooblen    = use_len;
+		ops.oobretlen = 0;
+		ops.ooboffs   = use_offset;
+		ops.datbuf    = 0;
+		ops.oobbuf    = writebuf;
+		err = mtd->write_oob(mtd, addr, &ops);
+		if (err || ops.oobretlen != use_len) {
+			printk(PRINT_PREF "error: writeoob failed at %#llx\n",
+			       (long long)addr);
+			printk(PRINT_PREF "error: use_len %d, use_offset %d\n",
+			       use_len, use_offset);
+			errcnt += 1;
+			return err ? err : -1;
+		}
+		if (vary_offset)
+			do_vary_offset();
+	}
+
+	return err;
+}
+
+static int write_whole_device(void)
+{
+	int err;
+	unsigned int i;
+
+	printk(PRINT_PREF "writing OOBs of whole device\n");
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = write_eraseblock(i);
+		if (err)
+			return err;
+		if (i % 256 == 0)
+			printk(PRINT_PREF "written up to eraseblock %u\n", i);
+		cond_resched();
+	}
+	printk(PRINT_PREF "written %u eraseblocks\n", i);
+	return 0;
+}
+
+static int verify_eraseblock(int ebnum)
+{
+	int i;
+	struct mtd_oob_ops ops;
+	int err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	for (i = 0; i < pgcnt; ++i, addr += mtd->writesize) {
+		set_random_data(writebuf, use_len);
+		ops.mode      = MTD_OOB_AUTO;
+		ops.len       = 0;
+		ops.retlen    = 0;
+		ops.ooblen    = use_len;
+		ops.oobretlen = 0;
+		ops.ooboffs   = use_offset;
+		ops.datbuf    = 0;
+		ops.oobbuf    = readbuf;
+		err = mtd->read_oob(mtd, addr, &ops);
+		if (err || ops.oobretlen != use_len) {
+			printk(PRINT_PREF "error: readoob failed at %#llx\n",
+			       (long long)addr);
+			errcnt += 1;
+			return err ? err : -1;
+		}
+		if (memcmp(readbuf, writebuf, use_len)) {
+			printk(PRINT_PREF "error: verify failed at %#llx\n",
+			       (long long)addr);
+			errcnt += 1;
+			if (errcnt > 1000) {
+				printk(PRINT_PREF "error: too many errors\n");
+				return -1;
+			}
+		}
+		if (use_offset != 0 || use_len < mtd->ecclayout->oobavail) {
+			int k;
+
+			ops.mode      = MTD_OOB_AUTO;
+			ops.len       = 0;
+			ops.retlen    = 0;
+			ops.ooblen    = mtd->ecclayout->oobavail;
+			ops.oobretlen = 0;
+			ops.ooboffs   = 0;
+			ops.datbuf    = 0;
+			ops.oobbuf    = readbuf;
+			err = mtd->read_oob(mtd, addr, &ops);
+			if (err || ops.oobretlen != mtd->ecclayout->oobavail) {
+				printk(PRINT_PREF "error: readoob failed at "
+				       "%#llx\n", (long long)addr);
+				errcnt += 1;
+				return err ? err : -1;
+			}
+			if (memcmp(readbuf + use_offset, writebuf, use_len)) {
+				printk(PRINT_PREF "error: verify failed at "
+				       "%#llx\n", (long long)addr);
+				errcnt += 1;
+				if (errcnt > 1000) {
+					printk(PRINT_PREF "error: too many "
+					       "errors\n");
+					return -1;
+				}
+			}
+			for (k = 0; k < use_offset; ++k)
+				if (readbuf[k] != 0xff) {
+					printk(PRINT_PREF "error: verify 0xff "
+					       "failed at %#llx\n",
+					       (long long)addr);
+					errcnt += 1;
+					if (errcnt > 1000) {
+						printk(PRINT_PREF "error: too "
+						       "many errors\n");
+						return -1;
+					}
+				}
+			for (k = use_offset + use_len;
+			     k < mtd->ecclayout->oobavail; ++k)
+				if (readbuf[k] != 0xff) {
+					printk(PRINT_PREF "error: verify 0xff "
+					       "failed at %#llx\n",
+					       (long long)addr);
+					errcnt += 1;
+					if (errcnt > 1000) {
+						printk(PRINT_PREF "error: too "
+						       "many errors\n");
+						return -1;
+					}
+				}
+		}
+		if (vary_offset)
+			do_vary_offset();
+	}
+	return err;
+}
+
+static int verify_eraseblock_in_one_go(int ebnum)
+{
+	struct mtd_oob_ops ops;
+	int err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+	size_t len = mtd->ecclayout->oobavail * pgcnt;
+
+	set_random_data(writebuf, len);
+	ops.mode      = MTD_OOB_AUTO;
+	ops.len       = 0;
+	ops.retlen    = 0;
+	ops.ooblen    = len;
+	ops.oobretlen = 0;
+	ops.ooboffs   = 0;
+	ops.datbuf    = 0;
+	ops.oobbuf    = readbuf;
+	err = mtd->read_oob(mtd, addr, &ops);
+	if (err || ops.oobretlen != len) {
+		printk(PRINT_PREF "error: readoob failed at %#llx\n",
+		       (long long)addr);
+		errcnt += 1;
+		return err ? err : -1;
+	}
+	if (memcmp(readbuf, writebuf, len)) {
+		printk(PRINT_PREF "error: verify failed at %#llx\n",
+		       (long long)addr);
+		errcnt += 1;
+		if (errcnt > 1000) {
+			printk(PRINT_PREF "error: too many errors\n");
+			return -1;
+		}
+	}
+
+	return err;
+}
+
+static int verify_all_eraseblocks(void)
+{
+	int err;
+	unsigned int i;
+
+	printk(PRINT_PREF "verifying all eraseblocks\n");
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = verify_eraseblock(i);
+		if (err)
+			return err;
+		if (i % 256 == 0)
+			printk(PRINT_PREF "verified up to eraseblock %u\n", i);
+		cond_resched();
+	}
+	printk(PRINT_PREF "verified %u eraseblocks\n", i);
+	return 0;
+}
+
+static int is_block_bad(int ebnum)
+{
+	int ret;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	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_oobtest_init(void)
+{
+	int err = 0;
+	unsigned int i;
+	uint64_t tmp;
+	struct mtd_oob_ops ops;
+	loff_t addr = 0, addr0;
+
+	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,
+	       mtd->writesize, ebcnt, pgcnt, mtd->oobsize);
+
+	err = -ENOMEM;
+	mtd->erasesize = mtd->erasesize;
+	readbuf = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!readbuf) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out;
+	}
+	writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!writebuf) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out;
+	}
+
+	err = scan_for_bad_eraseblocks();
+	if (err)
+		goto out;
+
+	use_offset = 0;
+	use_len = mtd->ecclayout->oobavail;
+	use_len_max = mtd->ecclayout->oobavail;
+	vary_offset = 0;
+
+	/* First test: write all OOB, read it back and verify */
+	printk(PRINT_PREF "test 1 of 5\n");
+
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	simple_srand(1);
+	err = write_whole_device();
+	if (err)
+		goto out;
+
+	simple_srand(1);
+	err = verify_all_eraseblocks();
+	if (err)
+		goto out;
+
+	/*
+	 * Second test: write all OOB, a block at a time, read it back and
+	 * verify.
+	 */
+	printk(PRINT_PREF "test 2 of 5\n");
+
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	simple_srand(3);
+	err = write_whole_device();
+	if (err)
+		goto out;
+
+	/* Check all eraseblocks */
+	simple_srand(3);
+	printk(PRINT_PREF "verifying all eraseblocks\n");
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = verify_eraseblock_in_one_go(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);
+
+	/*
+	 * Third test: write OOB at varying offsets and lengths, read it back
+	 * and verify.
+	 */
+	printk(PRINT_PREF "test 3 of 5\n");
+
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	/* Write all eraseblocks */
+	use_offset = 0;
+	use_len = mtd->ecclayout->oobavail;
+	use_len_max = mtd->ecclayout->oobavail;
+	vary_offset = 1;
+	simple_srand(5);
+	printk(PRINT_PREF "writing OOBs of 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 */
+	use_offset = 0;
+	use_len = mtd->ecclayout->oobavail;
+	use_len_max = mtd->ecclayout->oobavail;
+	vary_offset = 1;
+	simple_srand(5);
+	err = verify_all_eraseblocks();
+	if (err)
+		goto out;
+
+	use_offset = 0;
+	use_len = mtd->ecclayout->oobavail;
+	use_len_max = mtd->ecclayout->oobavail;
+	vary_offset = 0;
+
+	/* Fourth test: try to write off end of device */
+	printk(PRINT_PREF "test 4 of 5\n");
+
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	addr0 = 0;
+	for (i = 0; bbt[i] && i < ebcnt; ++i)
+		addr0 += mtd->erasesize;
+
+	/* Attempt to write off end of OOB */
+	ops.mode      = MTD_OOB_AUTO;
+	ops.len       = 0;
+	ops.retlen    = 0;
+	ops.ooblen    = 1;
+	ops.oobretlen = 0;
+	ops.ooboffs   = mtd->ecclayout->oobavail;
+	ops.datbuf    = 0;
+	ops.oobbuf    = writebuf;
+	printk(PRINT_PREF "attempting to start write past end of OOB\n");
+	printk(PRINT_PREF "an error is expected...\n");
+	err = mtd->write_oob(mtd, addr0, &ops);
+	if (err) {
+		printk(PRINT_PREF "error occurred as expected\n");
+		err = 0;
+	} else {
+		printk(PRINT_PREF "error: can write past end of OOB\n");
+		errcnt += 1;
+	}
+
+	/* Attempt to read off end of OOB */
+	ops.mode      = MTD_OOB_AUTO;
+	ops.len       = 0;
+	ops.retlen    = 0;
+	ops.ooblen    = 1;
+	ops.oobretlen = 0;
+	ops.ooboffs   = mtd->ecclayout->oobavail;
+	ops.datbuf    = 0;
+	ops.oobbuf    = readbuf;
+	printk(PRINT_PREF "attempting to start read past end of OOB\n");
+	printk(PRINT_PREF "an error is expected...\n");
+	err = mtd->read_oob(mtd, addr0, &ops);
+	if (err) {
+		printk(PRINT_PREF "error occurred as expected\n");
+		err = 0;
+	} else {
+		printk(PRINT_PREF "error: can read past end of OOB\n");
+		errcnt += 1;
+	}
+
+	if (bbt[ebcnt - 1])
+		printk(PRINT_PREF "skipping end of device tests because last "
+		       "block is bad\n");
+	else {
+		/* Attempt to write off end of device */
+		ops.mode      = MTD_OOB_AUTO;
+		ops.len       = 0;
+		ops.retlen    = 0;
+		ops.ooblen    = mtd->ecclayout->oobavail + 1;
+		ops.oobretlen = 0;
+		ops.ooboffs   = 0;
+		ops.datbuf    = 0;
+		ops.oobbuf    = writebuf;
+		printk(PRINT_PREF "attempting to write past end of device\n");
+		printk(PRINT_PREF "an error is expected...\n");
+		err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops);
+		if (err) {
+			printk(PRINT_PREF "error occurred as expected\n");
+			err = 0;
+		} else {
+			printk(PRINT_PREF "error: wrote past end of device\n");
+			errcnt += 1;
+		}
+
+		/* Attempt to read off end of device */
+		ops.mode      = MTD_OOB_AUTO;
+		ops.len       = 0;
+		ops.retlen    = 0;
+		ops.ooblen    = mtd->ecclayout->oobavail + 1;
+		ops.oobretlen = 0;
+		ops.ooboffs   = 0;
+		ops.datbuf    = 0;
+		ops.oobbuf    = readbuf;
+		printk(PRINT_PREF "attempting to read past end of device\n");
+		printk(PRINT_PREF "an error is expected...\n");
+		err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops);
+		if (err) {
+			printk(PRINT_PREF "error occurred as expected\n");
+			err = 0;
+		} else {
+			printk(PRINT_PREF "error: read past end of device\n");
+			errcnt += 1;
+		}
+
+		err = erase_eraseblock(ebcnt - 1);
+		if (err)
+			goto out;
+
+		/* Attempt to write off end of device */
+		ops.mode      = MTD_OOB_AUTO;
+		ops.len       = 0;
+		ops.retlen    = 0;
+		ops.ooblen    = mtd->ecclayout->oobavail;
+		ops.oobretlen = 0;
+		ops.ooboffs   = 1;
+		ops.datbuf    = 0;
+		ops.oobbuf    = writebuf;
+		printk(PRINT_PREF "attempting to write past end of device\n");
+		printk(PRINT_PREF "an error is expected...\n");
+		err = mtd->write_oob(mtd, mtd->size - mtd->writesize, &ops);
+		if (err) {
+			printk(PRINT_PREF "error occurred as expected\n");
+			err = 0;
+		} else {
+			printk(PRINT_PREF "error: wrote past end of device\n");
+			errcnt += 1;
+		}
+
+		/* Attempt to read off end of device */
+		ops.mode      = MTD_OOB_AUTO;
+		ops.len       = 0;
+		ops.retlen    = 0;
+		ops.ooblen    = mtd->ecclayout->oobavail;
+		ops.oobretlen = 0;
+		ops.ooboffs   = 1;
+		ops.datbuf    = 0;
+		ops.oobbuf    = readbuf;
+		printk(PRINT_PREF "attempting to read past end of device\n");
+		printk(PRINT_PREF "an error is expected...\n");
+		err = mtd->read_oob(mtd, mtd->size - mtd->writesize, &ops);
+		if (err) {
+			printk(PRINT_PREF "error occurred as expected\n");
+			err = 0;
+		} else {
+			printk(PRINT_PREF "error: read past end of device\n");
+			errcnt += 1;
+		}
+	}
+
+	/* Fifth test: write / read across block boundaries */
+	printk(PRINT_PREF "test 5 of 5\n");
+
+	/* Erase all eraseblocks */
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	/* Write all eraseblocks */
+	simple_srand(11);
+	printk(PRINT_PREF "writing OOBs of whole device\n");
+	for (i = 0; i < ebcnt - 1; ++i) {
+		int cnt = 2;
+		int pg;
+		size_t sz = mtd->ecclayout->oobavail;
+		if (bbt[i] || bbt[i + 1])
+			continue;
+		addr = (i + 1) * mtd->erasesize - mtd->writesize;
+		for (pg = 0; pg < cnt; ++pg) {
+			set_random_data(writebuf, sz);
+			ops.mode      = MTD_OOB_AUTO;
+			ops.len       = 0;
+			ops.retlen    = 0;
+			ops.ooblen    = sz;
+			ops.oobretlen = 0;
+			ops.ooboffs   = 0;
+			ops.datbuf    = 0;
+			ops.oobbuf    = writebuf;
+			err = mtd->write_oob(mtd, addr, &ops);
+			if (err)
+				goto out;
+			if (i % 256 == 0)
+				printk(PRINT_PREF "written up to eraseblock "
+				       "%u\n", i);
+			cond_resched();
+			addr += mtd->writesize;
+		}
+	}
+	printk(PRINT_PREF "written %u eraseblocks\n", i);
+
+	/* Check all eraseblocks */
+	simple_srand(11);
+	printk(PRINT_PREF "verifying all eraseblocks\n");
+	for (i = 0; i < ebcnt - 1; ++i) {
+		if (bbt[i] || bbt[i + 1])
+			continue;
+		set_random_data(writebuf, mtd->ecclayout->oobavail * 2);
+		addr = (i + 1) * mtd->erasesize - mtd->writesize;
+		ops.mode      = MTD_OOB_AUTO;
+		ops.len       = 0;
+		ops.retlen    = 0;
+		ops.ooblen    = mtd->ecclayout->oobavail * 2;
+		ops.oobretlen = 0;
+		ops.ooboffs   = 0;
+		ops.datbuf    = 0;
+		ops.oobbuf    = readbuf;
+		err = mtd->read_oob(mtd, addr, &ops);
+		if (err)
+			goto out;
+		if (memcmp(readbuf, writebuf, mtd->ecclayout->oobavail * 2)) {
+			printk(PRINT_PREF "error: verify failed at %#llx\n",
+			       (long long)addr);
+			errcnt += 1;
+			if (errcnt > 1000) {
+				printk(PRINT_PREF "error: too many errors\n");
+				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);
+
+	printk(PRINT_PREF "finished with %d errors\n", errcnt);
+out:
+	kfree(bbt);
+	kfree(writebuf);
+	kfree(readbuf);
+	put_mtd_device(mtd);
+	if (err)
+		printk(PRINT_PREF "error %d occurred\n", err);
+	printk(KERN_INFO "=================================================\n");
+	return err;
+}
+module_init(mtd_oobtest_init);
+
+static void __exit mtd_oobtest_exit(void)
+{
+	return;
+}
+module_exit(mtd_oobtest_exit);
+
+MODULE_DESCRIPTION("Out-of-band test module");
+MODULE_AUTHOR("Adrian Hunter");
+MODULE_LICENSE("GPL");

drivers/mtd/tests/mtd_pagetest.c

+/*
+ * 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");

drivers/mtd/tests/mtd_readtest.c

+/*
+ * 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.
+ *
+ * Check MTD device read.
+ *
+ * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
+ */
+
+#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_readtest: "
+
+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 *iobuf;
+static unsigned char *iobuf1;
+static unsigned char *bbt;
+
+static int pgsize;
+static int ebcnt;
+static int pgcnt;
+
+static int read_eraseblock_by_page(int ebnum)
+{
+	size_t read = 0;
+	int i, ret, err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+	void *buf = iobuf;
+	void *oobbuf = iobuf1;
+
+	for (i = 0; i < pgcnt; i++) {
+		memset(buf, 0 , pgcnt);
+		ret = mtd->read(mtd, addr, pgsize, &read, buf);
+		if (ret == -EUCLEAN)
+			ret = 0;
+		if (ret || read != pgsize) {
+			printk(PRINT_PREF "error: read failed at %#llx\n",
+			       (long long)addr);
+			if (!err)
+				err = ret;
+			if (!err)
+				err = -EINVAL;
+		}
+		if (mtd->oobsize) {
+			struct mtd_oob_ops ops;
+
+			ops.mode      = MTD_OOB_PLACE;
+			ops.len       = 0;
+			ops.retlen    = 0;
+			ops.ooblen    = mtd->oobsize;
+			ops.oobretlen = 0;
+			ops.ooboffs   = 0;
+			ops.datbuf    = 0;
+			ops.oobbuf    = oobbuf;
+			ret = mtd->read_oob(mtd, addr, &ops);
+			if (ret || ops.oobretlen != mtd->oobsize) {
+				printk(PRINT_PREF "error: read oob failed at "
+						  "%#llx\n", (long long)addr);
+				if (!err)
+					err = ret;
+				if (!err)
+					err = -EINVAL;
+			}
+			oobbuf += mtd->oobsize;
+		}
+		addr += pgsize;
+		buf += pgsize;
+	}
+
+	return err;
+}
+
+static void dump_eraseblock(int ebnum)
+{
+	int i, j, n;
+	char line[128];
+	int pg, oob;
+
+	printk(PRINT_PREF "dumping eraseblock %d\n", ebnum);
+	n = mtd->erasesize;
+	for (i = 0; i < n;) {
+		char *p = line;
+
+		p += sprintf(p, "%05x: ", i);
+		for (j = 0; j < 32 && i < n; j++, i++)
+			p += sprintf(p, "%02x", (unsigned int)iobuf[i]);
+		printk(KERN_CRIT "%s\n", line);
+		cond_resched();
+	}
+	if (!mtd->oobsize)
+		return;
+	printk(PRINT_PREF "dumping oob from eraseblock %d\n", ebnum);
+	n = mtd->oobsize;
+	for (pg = 0, i = 0; pg < pgcnt; pg++)
+		for (oob = 0; oob < n;) {
+			char *p = line;
+
+			p += sprintf(p, "%05x: ", i);
+			for (j = 0; j < 32 && oob < n; j++, oob++, i++)
+				p += sprintf(p, "%02x",
+					     (unsigned int)iobuf1[i]);
+			printk(KERN_CRIT "%s\n", line);
+			cond_resched();
+		}
+}
+
+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_readtest_init(void)
+{
+	uint64_t tmp;
+	int err, 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->writesize == 1) {
+		printk(PRINT_PREF "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 / 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;
+	iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!iobuf) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out;
+	}
+	iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!iobuf1) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out;
+	}
+
+	err = scan_for_bad_eraseblocks();
+	if (err)
+		goto out;
+
+	/* Read all eraseblocks 1 page at a time */
+	printk(PRINT_PREF "testing page read\n");
+	for (i = 0; i < ebcnt; ++i) {
+		int ret;
+
+		if (bbt[i])
+			continue;
+		ret = read_eraseblock_by_page(i);
+		if (ret) {
+			dump_eraseblock(i);
+			if (!err)
+				err = ret;
+		}
+		cond_resched();
+	}
+
+	if (err)
+		printk(PRINT_PREF "finished with errors\n");
+	else
+		printk(PRINT_PREF "finished\n");
+
+out:
+
+	kfree(iobuf);
+	kfree(iobuf1);
+	kfree(bbt);
+	put_mtd_device(mtd);
+	if (err)
+		printk(PRINT_PREF "error %d occurred\n", err);
+	printk(KERN_INFO "=================================================\n");
+	return err;
+}
+module_init(mtd_readtest_init);
+
+static void __exit mtd_readtest_exit(void)
+{
+	return;
+}
+module_exit(mtd_readtest_exit);
+
+MODULE_DESCRIPTION("Read test module");
+MODULE_AUTHOR("Adrian Hunter");
+MODULE_LICENSE("GPL");

drivers/mtd/tests/mtd_speedtest.c

+/*
+ * Copyright (C) 2007 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 read and write speed of a MTD device.
+ *
+ * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
+ */
+
+#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_speedtest: "
+
+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 *iobuf;
+static unsigned char *bbt;
+
+static int pgsize;
+static int ebcnt;
+static int pgcnt;
+static int goodebcnt;
+static struct timeval start, finish;
+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 erase_whole_device(void)
+{
+	int err;
+	unsigned int i;
+
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = erase_eraseblock(i);
+		if (err)
+			return err;
+		cond_resched();
+	}
+	return 0;
+}
+
+static int write_eraseblock(int ebnum)
+{
+	size_t written = 0;
+	int err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	err = mtd->write(mtd, addr, mtd->erasesize, &written, iobuf);
+	if (err || written != mtd->erasesize) {
+		printk(PRINT_PREF "error: write failed at %#llx\n", addr);
+		if (!err)
+			err = -EINVAL;
+	}
+
+	return err;
+}
+
+static int write_eraseblock_by_page(int ebnum)
+{
+	size_t written = 0;
+	int i, err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+	void *buf = iobuf;
+
+	for (i = 0; i < pgcnt; i++) {
+		err = mtd->write(mtd, addr, pgsize, &written, buf);
+		if (err || written != pgsize) {
+			printk(PRINT_PREF "error: write failed at %#llx\n",
+			       addr);
+			if (!err)
+				err = -EINVAL;
+			break;
+		}
+		addr += pgsize;
+		buf += pgsize;
+	}
+
+	return err;
+}
+
+static int write_eraseblock_by_2pages(int ebnum)
+{
+	size_t written = 0, sz = pgsize * 2;
+	int i, n = pgcnt / 2, err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+	void *buf = iobuf;
+
+	for (i = 0; i < n; i++) {
+		err = mtd->write(mtd, addr, sz, &written, buf);
+		if (err || written != sz) {
+			printk(PRINT_PREF "error: write failed at %#llx\n",
+			       addr);
+			if (!err)
+				err = -EINVAL;
+			return err;
+		}
+		addr += sz;
+		buf += sz;
+	}
+	if (pgcnt % 2) {
+		err = mtd->write(mtd, addr, pgsize, &written, buf);
+		if (err || written != pgsize) {
+			printk(PRINT_PREF "error: write failed at %#llx\n",
+			       addr);
+			if (!err)
+				err = -EINVAL;
+		}
+	}
+
+	return err;
+}
+
+static int read_eraseblock(int ebnum)
+{
+	size_t read = 0;
+	int err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	err = mtd->read(mtd, addr, mtd->erasesize, &read, iobuf);
+	/* Ignore corrected ECC errors */
+	if (err == -EUCLEAN)
+		err = 0;
+	if (err || read != mtd->erasesize) {
+		printk(PRINT_PREF "error: read failed at %#llx\n", addr);
+		if (!err)
+			err = -EINVAL;
+	}
+
+	return err;
+}
+
+static int read_eraseblock_by_page(int ebnum)
+{
+	size_t read = 0;
+	int i, err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+	void *buf = iobuf;
+
+	for (i = 0; i < pgcnt; i++) {
+		err = mtd->read(mtd, addr, pgsize, &read, buf);
+		/* Ignore corrected ECC errors */
+		if (err == -EUCLEAN)
+			err = 0;
+		if (err || read != pgsize) {
+			printk(PRINT_PREF "error: read failed at %#llx\n",
+			       addr);
+			if (!err)
+				err = -EINVAL;
+			break;
+		}
+		addr += pgsize;
+		buf += pgsize;
+	}
+
+	return err;
+}
+
+static int read_eraseblock_by_2pages(int ebnum)
+{
+	size_t read = 0, sz = pgsize * 2;
+	int i, n = pgcnt / 2, err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+	void *buf = iobuf;
+
+	for (i = 0; i < n; i++) {
+		err = mtd->read(mtd, addr, sz, &read, buf);
+		/* Ignore corrected ECC errors */
+		if (err == -EUCLEAN)
+			err = 0;
+		if (err || read != sz) {
+			printk(PRINT_PREF "error: read failed at %#llx\n",
+			       addr);
+			if (!err)
+				err = -EINVAL;
+			return err;
+		}
+		addr += sz;
+		buf += sz;
+	}
+	if (pgcnt % 2) {
+		err = mtd->read(mtd, addr, pgsize, &read, buf);
+		/* Ignore corrected ECC errors */
+		if (err == -EUCLEAN)
+			err = 0;
+		if (err || read != pgsize) {
+			printk(PRINT_PREF "error: read failed at %#llx\n",
+			       addr);
+			if (!err)
+				err = -EINVAL;
+		}
+	}
+
+	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 inline void start_timing(void)
+{
+	do_gettimeofday(&start);
+}
+
+static inline void stop_timing(void)
+{
+	do_gettimeofday(&finish);
+}
+
+static long calc_speed(void)
+{
+	long ms, k, speed;
+
+	ms = (finish.tv_sec - start.tv_sec) * 1000 +
+	     (finish.tv_usec - start.tv_usec) / 1000;
+	k = goodebcnt * mtd->erasesize / 1024;
+	speed = (k * 1000) / ms;
+	return speed;
+}
+
+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);
+	goodebcnt = ebcnt - bad;
+	return 0;
+}
+
+static int __init mtd_speedtest_init(void)
+{
+	int err, i;
+	long speed;
+	uint64_t tmp;
+
+	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->writesize == 1) {
+		printk(PRINT_PREF "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 / 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;
+	iobuf = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!iobuf) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out;
+	}
+
+	simple_srand(1);
+	set_random_data(iobuf, mtd->erasesize);
+
+	err = scan_for_bad_eraseblocks();
+	if (err)
+		goto out;
+
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	/* Write all eraseblocks, 1 eraseblock at a time */
+	printk(PRINT_PREF "testing eraseblock write speed\n");
+	start_timing();
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = write_eraseblock(i);
+		if (err)
+			goto out;
+		cond_resched();
+	}
+	stop_timing();
+	speed = calc_speed();
+	printk(PRINT_PREF "eraseblock write speed is %ld KiB/s\n", speed);
+
+	/* Read all eraseblocks, 1 eraseblock at a time */
+	printk(PRINT_PREF "testing eraseblock read speed\n");
+	start_timing();
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = read_eraseblock(i);
+		if (err)
+			goto out;
+		cond_resched();
+	}
+	stop_timing();
+	speed = calc_speed();
+	printk(PRINT_PREF "eraseblock read speed is %ld KiB/s\n", speed);
+
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	/* Write all eraseblocks, 1 page at a time */
+	printk(PRINT_PREF "testing page write speed\n");
+	start_timing();
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = write_eraseblock_by_page(i);
+		if (err)
+			goto out;
+		cond_resched();
+	}
+	stop_timing();
+	speed = calc_speed();
+	printk(PRINT_PREF "page write speed is %ld KiB/s\n", speed);
+
+	/* Read all eraseblocks, 1 page at a time */
+	printk(PRINT_PREF "testing page read speed\n");
+	start_timing();
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = read_eraseblock_by_page(i);
+		if (err)
+			goto out;
+		cond_resched();
+	}
+	stop_timing();
+	speed = calc_speed();
+	printk(PRINT_PREF "page read speed is %ld KiB/s\n", speed);
+
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	/* Write all eraseblocks, 2 pages at a time */
+	printk(PRINT_PREF "testing 2 page write speed\n");
+	start_timing();
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = write_eraseblock_by_2pages(i);
+		if (err)
+			goto out;
+		cond_resched();
+	}
+	stop_timing();
+	speed = calc_speed();
+	printk(PRINT_PREF "2 page write speed is %ld KiB/s\n", speed);
+
+	/* Read all eraseblocks, 2 pages at a time */
+	printk(PRINT_PREF "testing 2 page read speed\n");
+	start_timing();
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = read_eraseblock_by_2pages(i);
+		if (err)
+			goto out;
+		cond_resched();
+	}
+	stop_timing();
+	speed = calc_speed();
+	printk(PRINT_PREF "2 page read speed is %ld KiB/s\n", speed);
+
+	/* Erase all eraseblocks */
+	printk(PRINT_PREF "Testing erase speed\n");
+	start_timing();
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = erase_eraseblock(i);
+		if (err)
+			goto out;
+		cond_resched();
+	}
+	stop_timing();
+	speed = calc_speed();
+	printk(PRINT_PREF "erase speed is %ld KiB/s\n", speed);
+
+	printk(PRINT_PREF "finished\n");
+out:
+	kfree(iobuf);
+	kfree(bbt);
+	put_mtd_device(mtd);
+	if (err)
+		printk(PRINT_PREF "error %d occurred\n", err);
+	printk(KERN_INFO "=================================================\n");
+	return err;
+}
+module_init(mtd_speedtest_init);
+
+static void __exit mtd_speedtest_exit(void)
+{
+	return;
+}
+module_exit(mtd_speedtest_exit);
+
+MODULE_DESCRIPTION("Speed test module");
+MODULE_AUTHOR("Adrian Hunter");
+MODULE_LICENSE("GPL");

drivers/mtd/tests/mtd_stresstest.c

+/*
+ * 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 random reads, writes and erases on MTD device.
+ *
+ * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
+ */
+
+#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>
+#include <linux/vmalloc.h>
+
+#define PRINT_PREF KERN_INFO "mtd_stresstest: "
+
+static int dev;
+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 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 int rand_eb(void)
+{
+	int eb;
+
+again:
+	if (ebcnt < 32768)
+		eb = simple_rand();
+	else
+		eb = (simple_rand() << 15) | simple_rand();
+	/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
+	eb %= (ebcnt - 1);
+	if (bbt[eb])
+		goto again;
+	return eb;
+}
+
+static int rand_offs(void)
+{
+	int offs;
+
+	if (bufsize < 32768)
+		offs = simple_rand();
+	else
+		offs = (simple_rand() << 15) | simple_rand();
+	offs %= bufsize;
+	return offs;
+}
+
+static int rand_len(int offs)
+{
+	int len;
+
+	if (bufsize < 32768)
+		len = simple_rand();
+	else
+		len = (simple_rand() << 15) | simple_rand();
+	len %= (bufsize - offs);
+	return len;
+}
+
+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 (unlikely(err)) {
+		printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
+		return err;
+	}
+
+	if (unlikely(ei.state == MTD_ERASE_FAILED)) {
+		printk(PRINT_PREF "some erase error occurred at EB %d\n",
+		       ebnum);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+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 do_read(void)
+{
+	size_t read = 0;
+	int eb = rand_eb();
+	int offs = rand_offs();
+	int len = rand_len(offs), err;
+	loff_t addr;
+
+	if (bbt[eb + 1]) {
+		if (offs >= mtd->erasesize)
+			offs -= mtd->erasesize;
+		if (offs + len > mtd->erasesize)
+			len = mtd->erasesize - offs;
+	}
+	addr = eb * mtd->erasesize + offs;
+	err = mtd->read(mtd, addr, len, &read, readbuf);
+	if (err == -EUCLEAN)
+		err = 0;
+	if (unlikely(err || read != len)) {
+		printk(PRINT_PREF "error: read failed at 0x%llx\n",
+		       (long long)addr);
+		if (!err)
+			err = -EINVAL;
+		return err;
+	}
+	return 0;
+}
+
+static int do_write(void)
+{
+	int eb = rand_eb(), offs, err, len;
+	size_t written = 0;
+	loff_t addr;
+
+	offs = offsets[eb];
+	if (offs >= mtd->erasesize) {
+		err = erase_eraseblock(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 = erase_eraseblock(eb + 1);
+			if (err)
+				return err;
+			offsets[eb + 1] = 0;
+		}
+	}
+	addr = eb * mtd->erasesize + offs;
+	err = mtd->write(mtd, addr, len, &written, writebuf);
+	if (unlikely(err || written != len)) {
+		printk(PRINT_PREF "error: write failed at 0x%llx\n",
+		       (long long)addr);
+		if (!err)
+			err = -EINVAL;
+		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 (simple_rand() & 1)
+		return do_read();
+	else
+		return do_write();
+}
+
+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_stresstest_init(void)
+{
+	int err;
+	int i, op;
+	uint64_t tmp;
+
+	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->writesize == 1) {
+		printk(PRINT_PREF "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 / 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);
+
+	/* Read or write up 2 eraseblocks at a time */
+	bufsize = mtd->erasesize * 2;
+
+	err = -ENOMEM;
+	readbuf = vmalloc(bufsize);
+	writebuf = vmalloc(bufsize);
+	offsets = kmalloc(ebcnt * sizeof(int), GFP_KERNEL);
+	if (!readbuf || !writebuf || !offsets) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out;
+	}
+	for (i = 0; i < ebcnt; i++)
+		offsets[i] = mtd->erasesize;
+	simple_srand(current->pid);
+	for (i = 0; i < bufsize; i++)
+		writebuf[i] = simple_rand();
+
+	err = scan_for_bad_eraseblocks();
+	if (err)
+		goto out;
+
+	/* Do operations */
+	printk(PRINT_PREF "doing operations\n");
+	for (op = 0; op < count; op++) {
+		if ((op & 1023) == 0)
+			printk(PRINT_PREF "%d operations done\n", op);
+		err = do_operation();
+		if (err)
+			goto out;
+		cond_resched();
+	}
+	printk(PRINT_PREF "finished, %d operations done\n", op);
+
+out:
+	kfree(offsets);
+	kfree(bbt);
+	vfree(writebuf);
+	vfree(readbuf);
+	put_mtd_device(mtd);
+	if (err)
+		printk(PRINT_PREF "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");

drivers/mtd/tests/mtd_subpagetest.c

+/*
+ * Copyright (C) 2006-2007 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 sub-page read and write on MTD device.
+ * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
+ *
+ */
+
+#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_subpagetest: "
+
+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 *writebuf;
+static unsigned char *readbuf;
+static unsigned char *bbt;
+
+static int subpgsize;
+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 inline void clear_data(unsigned char *buf, size_t len)
+{
+	memset(buf, 0, len);
+}
+
+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 erase_whole_device(void)
+{
+	int err;
+	unsigned int i;
+
+	printk(PRINT_PREF "erasing whole device\n");
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = erase_eraseblock(i);
+		if (err)
+			return err;
+		cond_resched();
+	}
+	printk(PRINT_PREF "erased %u eraseblocks\n", i);
+	return 0;
+}
+
+static int write_eraseblock(int ebnum)
+{
+	size_t written = 0;
+	int err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	set_random_data(writebuf, subpgsize);
+	err = mtd->write(mtd, addr, subpgsize, &written, writebuf);
+	if (unlikely(err || written != subpgsize)) {
+		printk(PRINT_PREF "error: write failed at %#llx\n",
+		       (long long)addr);
+		if (written != subpgsize) {
+			printk(PRINT_PREF "  write size: %#x\n", subpgsize);
+			printk(PRINT_PREF "  written: %#x\n", written);
+		}
+		return err ? err : -1;
+	}
+
+	addr += subpgsize;
+
+	set_random_data(writebuf, subpgsize);
+	err = mtd->write(mtd, addr, subpgsize, &written, writebuf);
+	if (unlikely(err || written != subpgsize)) {
+		printk(PRINT_PREF "error: write failed at %#llx\n",
+		       (long long)addr);
+		if (written != subpgsize) {
+			printk(PRINT_PREF "  write size: %#x\n", subpgsize);
+			printk(PRINT_PREF "  written: %#x\n", written);
+		}
+		return err ? err : -1;
+	}
+
+	return err;
+}
+
+static int write_eraseblock2(int ebnum)
+{
+	size_t written = 0;
+	int err = 0, k;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	for (k = 1; k < 33; ++k) {
+		if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
+			break;
+		set_random_data(writebuf, subpgsize * k);
+		err = mtd->write(mtd, addr, subpgsize * k, &written, writebuf);
+		if (unlikely(err || written != subpgsize * k)) {
+			printk(PRINT_PREF "error: write failed at %#llx\n",
+			       (long long)addr);
+			if (written != subpgsize) {
+				printk(PRINT_PREF "  write size: %#x\n",
+				       subpgsize * k);
+				printk(PRINT_PREF "  written: %#08x\n",
+				       written);
+			}
+			return err ? err : -1;
+		}
+		addr += subpgsize * k;
+	}
+
+	return err;
+}
+
+static void print_subpage(unsigned char *p)
+{
+	int i, j;
+
+	for (i = 0; i < subpgsize; ) {
+		for (j = 0; i < subpgsize && j < 32; ++i, ++j)
+			printk("%02x", *p++);
+		printk("\n");
+	}
+}
+
+static int verify_eraseblock(int ebnum)
+{
+	size_t read = 0;
+	int err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	set_random_data(writebuf, subpgsize);
+	clear_data(readbuf, subpgsize);
+	read = 0;
+	err = mtd->read(mtd, addr, subpgsize, &read, readbuf);
+	if (unlikely(err || read != subpgsize)) {
+		if (err == -EUCLEAN && read == subpgsize) {
+			printk(PRINT_PREF "ECC correction at %#llx\n",
+			       (long long)addr);
+			err = 0;
+		} else {
+			printk(PRINT_PREF "error: read failed at %#llx\n",
+			       (long long)addr);
+			return err ? err : -1;
+		}
+	}
+	if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
+		printk(PRINT_PREF "error: verify failed at %#llx\n",
+		       (long long)addr);
+		printk(PRINT_PREF "------------- written----------------\n");
+		print_subpage(writebuf);
+		printk(PRINT_PREF "------------- read ------------------\n");
+		print_subpage(readbuf);
+		printk(PRINT_PREF "-------------------------------------\n");
+		errcnt += 1;
+	}
+
+	addr += subpgsize;
+
+	set_random_data(writebuf, subpgsize);
+	clear_data(readbuf, subpgsize);
+	read = 0;
+	err = mtd->read(mtd, addr, subpgsize, &read, readbuf);
+	if (unlikely(err || read != subpgsize)) {
+		if (err == -EUCLEAN && read == subpgsize) {
+			printk(PRINT_PREF "ECC correction at %#llx\n",
+			       (long long)addr);
+			err = 0;
+		} else {
+			printk(PRINT_PREF "error: read failed at %#llx\n",
+			       (long long)addr);
+			return err ? err : -1;
+		}
+	}
+	if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
+		printk(PRINT_PREF "error: verify failed at %#llx\n",
+		       (long long)addr);
+		printk(PRINT_PREF "------------- written----------------\n");
+		print_subpage(writebuf);
+		printk(PRINT_PREF "------------- read ------------------\n");
+		print_subpage(readbuf);
+		printk(PRINT_PREF "-------------------------------------\n");
+		errcnt += 1;
+	}
+
+	return err;
+}
+
+static int verify_eraseblock2(int ebnum)
+{
+	size_t read = 0;
+	int err = 0, k;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	for (k = 1; k < 33; ++k) {
+		if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
+			break;
+		set_random_data(writebuf, subpgsize * k);
+		clear_data(readbuf, subpgsize * k);
+		read = 0;
+		err = mtd->read(mtd, addr, subpgsize * k, &read, readbuf);
+		if (unlikely(err || read != subpgsize * k)) {
+			if (err == -EUCLEAN && read == subpgsize * k) {
+				printk(PRINT_PREF "ECC correction at %#llx\n",
+				       (long long)addr);
+				err = 0;
+			} else {
+				printk(PRINT_PREF "error: read failed at "
+				       "%#llx\n", (long long)addr);
+				return err ? err : -1;
+			}
+		}
+		if (unlikely(memcmp(readbuf, writebuf, subpgsize * k))) {
+			printk(PRINT_PREF "error: verify failed at %#llx\n",
+			       (long long)addr);
+			errcnt += 1;
+		}
+		addr += subpgsize * k;
+	}
+
+	return err;
+}
+
+static int verify_eraseblock_ff(int ebnum)
+{
+	uint32_t j;
+	size_t read = 0;
+	int err = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	memset(writebuf, 0xff, subpgsize);
+	for (j = 0; j < mtd->erasesize / subpgsize; ++j) {
+		clear_data(readbuf, subpgsize);
+		read = 0;
+		err = mtd->read(mtd, addr, subpgsize, &read, readbuf);
+		if (unlikely(err || read != subpgsize)) {
+			if (err == -EUCLEAN && read == subpgsize) {
+				printk(PRINT_PREF "ECC correction at %#llx\n",
+				       (long long)addr);
+				err = 0;
+			} else {
+				printk(PRINT_PREF "error: read failed at "
+				       "%#llx\n", (long long)addr);
+				return err ? err : -1;
+			}
+		}
+		if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
+			printk(PRINT_PREF "error: verify 0xff failed at "
+			       "%#llx\n", (long long)addr);
+			errcnt += 1;
+		}
+		addr += subpgsize;
+	}
+
+	return err;
+}
+
+static int verify_all_eraseblocks_ff(void)
+{
+	int err;
+	unsigned int i;
+
+	printk(PRINT_PREF "verifying all eraseblocks for 0xff\n");
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = verify_eraseblock_ff(i);
+		if (err)
+			return err;
+		if (i % 256 == 0)
+			printk(PRINT_PREF "verified up to eraseblock %u\n", i);
+		cond_resched();
+	}
+	printk(PRINT_PREF "verified %u eraseblocks\n", i);
+	return 0;
+}
+
+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_subpagetest_init(void)
+{
+	int err = 0;
+	uint32_t i;
+	uint64_t tmp;
+
+	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;
+	}
+
+	subpgsize = mtd->writesize >> mtd->subpage_sft;
+	printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
+	       "page size %u, subpage size %u, count of eraseblocks %u, "
+	       "pages per eraseblock %u, OOB size %u\n",
+	       (unsigned long long)mtd->size, mtd->erasesize,
+	       mtd->writesize, subpgsize, ebcnt, pgcnt, mtd->oobsize);
+
+	err = -ENOMEM;
+	bufsize = subpgsize * 32;
+	writebuf = kmalloc(bufsize, GFP_KERNEL);
+	if (!writebuf) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out;
+	}
+	readbuf = kmalloc(bufsize, GFP_KERNEL);
+	if (!readbuf) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out;
+	}
+
+	tmp = mtd->size;
+	do_div(tmp, mtd->erasesize);
+	ebcnt = tmp;
+	pgcnt = mtd->erasesize / mtd->writesize;
+
+	err = scan_for_bad_eraseblocks();
+	if (err)
+		goto out;
+
+	err = erase_whole_device();
+	if (err)
+		goto out;
+
+	printk(PRINT_PREF "writing whole device\n");
+	simple_srand(1);
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = write_eraseblock(i);
+		if (unlikely(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);
+
+	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 (unlikely(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 = erase_whole_device();
+	if (err)
+		goto out;
+
+	err = verify_all_eraseblocks_ff();
+	if (err)
+		goto out;
+
+	/* Write all eraseblocks */
+	simple_srand(3);
+	printk(PRINT_PREF "writing whole device\n");
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = write_eraseblock2(i);
+		if (unlikely(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(3);
+	printk(PRINT_PREF "verifying all eraseblocks\n");
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = verify_eraseblock2(i);
+		if (unlikely(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 = erase_whole_device();
+	if (err)
+		goto out;
+
+	err = verify_all_eraseblocks_ff();
+	if (err)
+		goto out;
+
+	printk(PRINT_PREF "finished with %d errors\n", errcnt);
+
+out:
+	kfree(bbt);
+	kfree(readbuf);
+	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_subpagetest_init);
+
+static void __exit mtd_subpagetest_exit(void)
+{
+	return;
+}
+module_exit(mtd_subpagetest_exit);
+
+MODULE_DESCRIPTION("Subpage test module");
+MODULE_AUTHOR("Adrian Hunter");
+MODULE_LICENSE("GPL");

drivers/mtd/tests/mtd_torturetest.c

+/*
+ * Copyright (C) 2006-2008 Artem Bityutskiy
+ * Copyright (C) 2006-2008 Jarkko Lavinen
+ * Copyright (C) 2006-2008 Adrian Hunter
+ *
+ * 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.
+ *
+ * Authors: Artem Bityutskiy, Jarkko Lavinen, Adria Hunter
+ *
+ * WARNING: this test program may kill your flash and your device. Do not
+ * use it unless you know what you do. Authors are not responsible for any
+ * damage caused by this program.
+ */
+
+#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_torturetest: "
+#define RETRIES 3
+
+static int eb = 8;
+module_param(eb, int, S_IRUGO);
+MODULE_PARM_DESC(eb, "eraseblock number within the selected MTD device");
+
+static int ebcnt = 32;
+module_param(ebcnt, int, S_IRUGO);
+MODULE_PARM_DESC(ebcnt, "number of consecutive eraseblocks to torture");
+
+static int pgcnt;
+module_param(pgcnt, int, S_IRUGO);
+MODULE_PARM_DESC(pgcnt, "number of pages per eraseblock to torture (0 => all)");
+
+static int dev;
+module_param(dev, int, S_IRUGO);
+MODULE_PARM_DESC(dev, "MTD device number to use");
+
+static int gran = 512;
+module_param(gran, int, S_IRUGO);
+MODULE_PARM_DESC(gran, "how often the status information should be printed");
+
+static int check = 1;
+module_param(check, int, S_IRUGO);
+MODULE_PARM_DESC(check, "if the written data should be checked");
+
+static unsigned int cycles_count;
+module_param(cycles_count, uint, S_IRUGO);
+MODULE_PARM_DESC(cycles_count, "how many erase cycles to do "
+			       "(infinite by default)");
+
+static struct mtd_info *mtd;
+
+/* This buffer contains 0x555555...0xAAAAAA... pattern */
+static unsigned char *patt_5A5;
+/* This buffer contains 0xAAAAAA...0x555555... pattern */
+static unsigned char *patt_A5A;
+/* This buffer contains all 0xFF bytes */
+static unsigned char *patt_FF;
+/* This a temporary buffer is use when checking data */
+static unsigned char *check_buf;
+/* How many erase cycles were done */
+static unsigned int erase_cycles;
+
+static int pgsize;
+static struct timeval start, finish;
+
+static void report_corrupt(unsigned char *read, unsigned char *written);
+
+static inline void start_timing(void)
+{
+	do_gettimeofday(&start);
+}
+
+static inline void stop_timing(void)
+{
+	do_gettimeofday(&finish);
+}
+
+/*
+ * Erase eraseblock number @ebnum.
+ */
+static inline 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;
+}
+
+/*
+ * Check that the contents of eraseblock number @enbum is equivalent to the
+ * @buf buffer.
+ */
+static inline int check_eraseblock(int ebnum, unsigned char *buf)
+{
+	int err, retries = 0;
+	size_t read = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+	size_t len = mtd->erasesize;
+
+	if (pgcnt) {
+		addr = (ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
+		len = pgcnt * pgsize;
+	}
+
+retry:
+	err = mtd->read(mtd, addr, len, &read, check_buf);
+	if (err == -EUCLEAN)
+		printk(PRINT_PREF "single bit flip occurred at EB %d "
+		       "MTD reported that it was fixed.\n", ebnum);
+	else if (err) {
+		printk(PRINT_PREF "error %d while reading EB %d, "
+		       "read %zd\n", err, ebnum, read);
+		return err;
+	}
+
+	if (read != len) {
+		printk(PRINT_PREF "failed to read %zd bytes from EB %d, "
+		       "read only %zd, but no error reported\n",
+		       len, ebnum, read);
+		return -EIO;
+	}
+
+	if (memcmp(buf, check_buf, len)) {
+		printk(PRINT_PREF "read wrong data from EB %d\n", ebnum);
+		report_corrupt(check_buf, buf);
+
+		if (retries++ < RETRIES) {
+			/* Try read again */
+			yield();
+			printk(PRINT_PREF "re-try reading data from EB %d\n",
+			       ebnum);
+			goto retry;
+		} else {
+			printk(PRINT_PREF "retried %d times, still errors, "
+			       "give-up\n", RETRIES);
+			return -EINVAL;
+		}
+	}
+
+	if (retries != 0)
+		printk(PRINT_PREF "only attempt number %d was OK (!!!)\n",
+		       retries);
+
+	return 0;
+}
+
+static inline int write_pattern(int ebnum, void *buf)
+{
+	int err;
+	size_t written = 0;
+	loff_t addr = ebnum * mtd->erasesize;
+	size_t len = mtd->erasesize;
+
+	if (pgcnt) {
+		addr = (ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
+		len = pgcnt * pgsize;
+	}
+	err = mtd->write(mtd, addr, len, &written, buf);
+	if (err) {
+		printk(PRINT_PREF "error %d while writing EB %d, written %zd"
+		      " bytes\n", err, ebnum, written);
+		return err;
+	}
+	if (written != len) {
+		printk(PRINT_PREF "written only %zd bytes of %zd, but no error"
+		       " reported\n", written, len);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int __init tort_init(void)
+{
+	int err = 0, i, infinite = !cycles_count;
+	int bad_ebs[ebcnt];
+
+	printk(KERN_INFO "\n");
+	printk(KERN_INFO "=================================================\n");
+	printk(PRINT_PREF "Warning: this program is trying to wear out your "
+	       "flash, stop it if this is not wanted.\n");
+	printk(PRINT_PREF "MTD device: %d\n", dev);
+	printk(PRINT_PREF "torture %d eraseblocks (%d-%d) of mtd%d\n",
+	       ebcnt, eb, eb + ebcnt - 1, dev);
+	if (pgcnt)
+		printk(PRINT_PREF "torturing just %d pages per eraseblock\n",
+			pgcnt);
+	printk(PRINT_PREF "write verify %s\n", check ? "enabled" : "disabled");
+
+	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->writesize == 1) {
+		printk(PRINT_PREF "not NAND flash, assume page size is 512 "
+		       "bytes.\n");
+		pgsize = 512;
+	} else
+		pgsize = mtd->writesize;
+
+	if (pgcnt && (pgcnt > mtd->erasesize / pgsize || pgcnt < 0)) {
+		printk(PRINT_PREF "error: invalid pgcnt value %d\n", pgcnt);
+		goto out_mtd;
+	}
+
+	err = -ENOMEM;
+	patt_5A5 = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!patt_5A5) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out_mtd;
+	}
+
+	patt_A5A = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!patt_A5A) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out_patt_5A5;
+	}
+
+	patt_FF = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!patt_FF) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out_patt_A5A;
+	}
+
+	check_buf = kmalloc(mtd->erasesize, GFP_KERNEL);
+	if (!check_buf) {
+		printk(PRINT_PREF "error: cannot allocate memory\n");
+		goto out_patt_FF;
+	}
+
+	err = 0;
+
+	/* Initialize patterns */
+	memset(patt_FF, 0xFF, mtd->erasesize);
+	for (i = 0; i < mtd->erasesize / pgsize; i++) {
+		if (!(i & 1)) {
+			memset(patt_5A5 + i * pgsize, 0x55, pgsize);
+			memset(patt_A5A + i * pgsize, 0xAA, pgsize);
+		} else {
+			memset(patt_5A5 + i * pgsize, 0xAA, pgsize);
+			memset(patt_A5A + i * pgsize, 0x55, pgsize);
+		}
+	}
+
+	/*
+	 * Check if there is a bad eraseblock among those we are going to test.
+	 */
+	memset(&bad_ebs[0], 0, sizeof(int) * ebcnt);
+	if (mtd->block_isbad) {
+		for (i = eb; i < eb + ebcnt; i++) {
+			err = mtd->block_isbad(mtd,
+					       (loff_t)i * mtd->erasesize);
+
+			if (err < 0) {
+				printk(PRINT_PREF "block_isbad() returned %d "
+				       "for EB %d\n", err, i);
+				goto out;
+			}
+
+			if (err) {
+				printk("EB %d is bad. Skip it.\n", i);
+				bad_ebs[i - eb] = 1;
+			}
+		}
+	}
+
+	start_timing();
+	while (1) {
+		int i;
+		void *patt;
+
+		/* Erase all eraseblocks */
+		for (i = eb; i < eb + ebcnt; i++) {
+			if (bad_ebs[i - eb])
+				continue;
+			err = erase_eraseblock(i);
+			if (err)
+				goto out;
+			cond_resched();
+		}
+
+		/* Check if the eraseblocks contain only 0xFF bytes */
+		if (check) {
+			for (i = eb; i < eb + ebcnt; i++) {
+				if (bad_ebs[i - eb])
+					continue;
+				err = check_eraseblock(i, patt_FF);
+				if (err) {
+					printk(PRINT_PREF "verify failed"
+					       " for 0xFF... pattern\n");
+					goto out;
+				}
+				cond_resched();
+			}
+		}
+
+		/* Write the pattern */
+		for (i = eb; i < eb + ebcnt; i++) {
+			if (bad_ebs[i - eb])
+				continue;
+			if ((eb + erase_cycles) & 1)
+				patt = patt_5A5;
+			else
+				patt = patt_A5A;
+			err = write_pattern(i, patt);
+			if (err)
+				goto out;
+			cond_resched();
+		}
+
+		/* Verify what we wrote */
+		if (check) {
+			for (i = eb; i < eb + ebcnt; i++) {
+				if (bad_ebs[i - eb])
+					continue;
+				if ((eb + erase_cycles) & 1)
+					patt = patt_5A5;
+				else
+					patt = patt_A5A;
+				err = check_eraseblock(i, patt);
+				if (err) {
+					printk(PRINT_PREF "verify failed for %s"
+					       " pattern\n",
+					       ((eb + erase_cycles) & 1) ?
+					       "0x55AA55..." : "0xAA55AA...");
+					goto out;
+				}
+				cond_resched();
+			}
+		}
+
+		erase_cycles += 1;
+
+		if (erase_cycles % gran == 0) {
+			long ms;
+
+			stop_timing();
+			ms = (finish.tv_sec - start.tv_sec) * 1000 +
+			     (finish.tv_usec - start.tv_usec) / 1000;
+			printk(PRINT_PREF "%08u erase cycles done, took %lu "
+			       "milliseconds (%lu seconds)\n",
+			       erase_cycles, ms, ms / 1000);
+			start_timing();
+		}
+
+		if (!infinite && --cycles_count == 0)
+			break;
+	}
+out:
+
+	printk(PRINT_PREF "finished after %u erase cycles\n",
+	       erase_cycles);
+	kfree(check_buf);
+out_patt_FF:
+	kfree(patt_FF);
+out_patt_A5A:
+	kfree(patt_A5A);
+out_patt_5A5:
+	kfree(patt_5A5);
+out_mtd:
+	put_mtd_device(mtd);
+	if (err)
+		printk(PRINT_PREF "error %d occurred during torturing\n", err);
+	printk(KERN_INFO "=================================================\n");
+	return err;
+}
+module_init(tort_init);
+
+static void __exit tort_exit(void)
+{
+	return;
+}
+module_exit(tort_exit);
+
+static int countdiffs(unsigned char *buf, unsigned char *check_buf,
+		      unsigned offset, unsigned len, unsigned *bytesp,
+		      unsigned *bitsp);
+static void print_bufs(unsigned char *read, unsigned char *written, int start,
+		       int len);
+
+/*
+ * Report the detailed information about how the read EB differs from what was
+ * written.
+ */
+static void report_corrupt(unsigned char *read, unsigned char *written)
+{
+	int i;
+	int bytes, bits, pages, first;
+	int offset, len;
+	size_t check_len = mtd->erasesize;
+
+	if (pgcnt)
+		check_len = pgcnt * pgsize;
+
+	bytes = bits = pages = 0;
+	for (i = 0; i < check_len; i += pgsize)
+		if (countdiffs(written, read, i, pgsize, &bytes,
+			       &bits) >= 0)
+			pages++;
+
+	printk(PRINT_PREF "verify fails on %d pages, %d bytes/%d bits\n",
+	       pages, bytes, bits);
+	printk(PRINT_PREF "The following is a list of all differences between"
+	       " what was read from flash and what was expected\n");
+
+	for (i = 0; i < check_len; i += pgsize) {
+		cond_resched();
+		bytes = bits = 0;
+		first = countdiffs(written, read, i, pgsize, &bytes,
+				   &bits);
+		if (first < 0)
+			continue;
+
+		printk("-------------------------------------------------------"
+		       "----------------------------------\n");
+
+		printk(PRINT_PREF "Page %d has %d bytes/%d bits failing verify,"
+		       " starting at offset 0x%x\n",
+		       (mtd->erasesize - check_len + i) / pgsize,
+		       bytes, bits, first);
+
+		offset = first & ~0x7;
+		len = ((first + bytes) | 0x7) + 1 - offset;
+
+		print_bufs(read, written, offset, len);
+	}
+}
+
+static void print_bufs(unsigned char *read, unsigned char *written, int start,
+		       int len)
+{
+	int i = 0, j1, j2;
+	char *diff;
+
+	printk("Offset       Read                          Written\n");
+	while (i < len) {
+		printk("0x%08x: ", start + i);
+		diff = "   ";
+		for (j1 = 0; j1 < 8 && i + j1 < len; j1++) {
+			printk(" %02x", read[start + i + j1]);
+			if (read[start + i + j1] != written[start + i + j1])
+				diff = "***";
+		}
+
+		while (j1 < 8) {
+			printk(" ");
+			j1 += 1;
+		}
+
+		printk("  %s ", diff);
+
+		for (j2 = 0; j2 < 8 && i + j2 < len; j2++)
+			printk(" %02x", written[start + i + j2]);
+		printk("\n");
+		i += 8;
+	}
+}
+
+/*
+ * Count the number of differing bytes and bits and return the first differing
+ * offset.
+ */
+static int countdiffs(unsigned char *buf, unsigned char *check_buf,
+		      unsigned offset, unsigned len, unsigned *bytesp,
+		      unsigned *bitsp)
+{
+	unsigned i, bit;
+	int first = -1;
+
+	for (i = offset; i < offset + len; i++)
+		if (buf[i] != check_buf[i]) {
+			first = i;
+			break;
+		}
+
+	while (i < offset + len) {
+		if (buf[i] != check_buf[i]) {
+			(*bytesp)++;
+			bit = 1;
+			while (bit < 256) {
+				if ((buf[i] & bit) != (check_buf[i] & bit))
+					(*bitsp)++;
+				bit <<= 1;
+			}
+		}
+		i++;
+	}
+
+	return first;
+}
+
+MODULE_DESCRIPTION("Eraseblock torturing module");
+MODULE_AUTHOR("Artem Bityutskiy, Jarkko Lavinen, Adrian Hunter");
+MODULE_LICENSE("GPL");