drivers/mtd/tests/mtd_stresstest.c - maze/linux - Git at Google

 /*
  * 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);

 	/* NOR flash does not implement block_isbad */
 	if (mtd->block_isbad == NULL)
 		return 0;

 	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 / pgsize;

 	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");
	/*
	* 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);

	/* NOR flash does not implement block_isbad */
	if (mtd->block_isbad == NULL)
	return 0;

	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 / pgsize;

	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");