Ejemplo n.º 1
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: %#zx\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: %#zx\n", written);
		}
		return err ? err : -1;
	}

	return err;
}
Ejemplo n.º 2
0
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    = NULL;
	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;
}
Ejemplo n.º 3
0
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    = NULL;
		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;
}
Ejemplo n.º 4
0
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;
}
Ejemplo n.º 5
0
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: %#08zx\n",
				       written);
			}
			return err ? err : -1;
		}
		addr += subpgsize * k;
	}

	return err;
}
Ejemplo n.º 6
0
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; i < ebcnt && bbt[i]; ++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;
}
Ejemplo n.º 7
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 __init mtd_speedtest_init(void)
{
	int err, i, blocks, j, k;
	long speed;
	uint64_t tmp;

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

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

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

	if (count > 0 && count < ebcnt)
		ebcnt = count;

	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);

	/* Multi-block erase all eraseblocks */
	for (k = 1; k < 7; k++) {
		blocks = 1 << k;
		printk(PRINT_PREF "Testing %dx multi-block erase speed\n",
		       blocks);
		start_timing();
		for (i = 0; i < ebcnt; ) {
			for (j = 0; j < blocks && (i + j) < ebcnt; j++)
				if (bbt[i + j])
					break;
			if (j < 1) {
				i++;
				continue;
			}
			err = multiblock_erase(i, j);
			if (err)
				goto out;
			cond_resched();
			i += j;
		}
		stop_timing();
		speed = calc_speed();
		printk(PRINT_PREF "%dx multi-block erase speed is %ld KiB/s\n",
		       blocks, 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;
}
Ejemplo n.º 9
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;

	
	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;

	
	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;

	
	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);

	
	printk(PRINT_PREF "test 3 of 5\n");

	err = erase_whole_device();
	if (err)
		goto out;

	
	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);

	
	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;

	
	printk(PRINT_PREF "test 4 of 5\n");

	err = erase_whole_device();
	if (err)
		goto out;

	addr0 = 0;
	for (i = 0; i < ebcnt && bbt[i]; ++i)
		addr0 += mtd->erasesize;

	
	ops.mode      = MTD_OOB_AUTO;
	ops.len       = 0;
	ops.retlen    = 0;
	ops.ooblen    = 1;
	ops.oobretlen = 0;
	ops.ooboffs   = mtd->ecclayout->oobavail;
	ops.datbuf    = NULL;
	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;
	}

	
	ops.mode      = MTD_OOB_AUTO;
	ops.len       = 0;
	ops.retlen    = 0;
	ops.ooblen    = 1;
	ops.oobretlen = 0;
	ops.ooboffs   = mtd->ecclayout->oobavail;
	ops.datbuf    = NULL;
	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 {
		
		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    = NULL;
		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;
		}

		
		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    = NULL;
		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;

		
		ops.mode      = MTD_OOB_AUTO;
		ops.len       = 0;
		ops.retlen    = 0;
		ops.ooblen    = mtd->ecclayout->oobavail;
		ops.oobretlen = 0;
		ops.ooboffs   = 1;
		ops.datbuf    = NULL;
		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;
		}

		
		ops.mode      = MTD_OOB_AUTO;
		ops.len       = 0;
		ops.retlen    = 0;
		ops.ooblen    = mtd->ecclayout->oobavail;
		ops.oobretlen = 0;
		ops.ooboffs   = 1;
		ops.datbuf    = NULL;
		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;
		}
	}

	
	printk(PRINT_PREF "test 5 of 5\n");

	
	err = erase_whole_device();
	if (err)
		goto out;

	
	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    = NULL;
			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);

	
	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    = NULL;
		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;
}
Ejemplo n.º 10
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    = NULL;
		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    = NULL;
			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;
}
Ejemplo n.º 11
0
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;
}
Ejemplo n.º 12
0
static int erasecrosstest(void)
{
	size_t read = 0, written = 0;
	int err = 0, i, ebnum, ebnum2;
	loff_t addr0;
	char *readbuf = twopages;

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "erasecrosstest\n");
#else
	;
#endif

	ebnum = 0;
	addr0 = 0;
	for (i = 0; i < ebcnt && bbt[i]; ++i) {
		addr0 += mtd->erasesize;
		ebnum += 1;
	}

	ebnum2 = ebcnt - 1;
	while (ebnum2 && bbt[ebnum2])
		ebnum2 -= 1;

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "erasing block %d\n", ebnum);
#else
	;
#endif
	err = erase_eraseblock(ebnum);
	if (err)
		return err;

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "writing 1st page of block %d\n", ebnum);
#else
	;
#endif
	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) {
#ifdef CONFIG_DEBUG_PRINTK
		printk(PRINT_PREF "error: write failed at %#llx\n",
		       (long long)addr0);
#else
		;
#endif
		return err ? err : -1;
	}

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "reading 1st page of block %d\n", ebnum);
#else
	;
#endif
	memset(readbuf, 0, pgsize);
	err = mtd->read(mtd, addr0, pgsize, &read, readbuf);
	if (err == -EUCLEAN)
		err = 0;
	if (err || read != pgsize) {
#ifdef CONFIG_DEBUG_PRINTK
		printk(PRINT_PREF "error: read failed at %#llx\n",
		       (long long)addr0);
#else
		;
#endif
		return err ? err : -1;
	}

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "verifying 1st page of block %d\n", ebnum);
#else
	;
#endif
	if (memcmp(writebuf, readbuf, pgsize)) {
#ifdef CONFIG_DEBUG_PRINTK
		printk(PRINT_PREF "verify failed!\n");
#else
		;
#endif
		errcnt += 1;
		return -1;
	}

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "erasing block %d\n", ebnum);
#else
	;
#endif
	err = erase_eraseblock(ebnum);
	if (err)
		return err;

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "writing 1st page of block %d\n", ebnum);
#else
	;
#endif
	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) {
#ifdef CONFIG_DEBUG_PRINTK
		printk(PRINT_PREF "error: write failed at %#llx\n",
		       (long long)addr0);
#else
		;
#endif
		return err ? err : -1;
	}

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "erasing block %d\n", ebnum2);
#else
	;
#endif
	err = erase_eraseblock(ebnum2);
	if (err)
		return err;

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "reading 1st page of block %d\n", ebnum);
#else
	;
#endif
	memset(readbuf, 0, pgsize);
	err = mtd->read(mtd, addr0, pgsize, &read, readbuf);
	if (err == -EUCLEAN)
		err = 0;
	if (err || read != pgsize) {
#ifdef CONFIG_DEBUG_PRINTK
		printk(PRINT_PREF "error: read failed at %#llx\n",
		       (long long)addr0);
#else
		;
#endif
		return err ? err : -1;
	}

#ifdef CONFIG_DEBUG_PRINTK
	printk(PRINT_PREF "verifying 1st page of block %d\n", ebnum);
#else
	;
#endif
	if (memcmp(writebuf, readbuf, pgsize)) {
#ifdef CONFIG_DEBUG_PRINTK
		printk(PRINT_PREF "verify failed!\n");
#else
		;
#endif
		errcnt += 1;
		return -1;
	}

	if (!err)
#ifdef CONFIG_DEBUG_PRINTK
		printk(PRINT_PREF "erasecrosstest ok\n");
#else
		;
#endif
	return err;
}
Ejemplo n.º 13
0
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; i < ebcnt && bbt[i]; ++i)
		addr0 += mtd->erasesize;

	addrn = mtd->size;
	for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++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) {
#ifdef CONFIG_DEBUG_PRINTK
			printk(PRINT_PREF "error: read failed at %#llx\n",
			       (long long)addr0);
#else
			;
#endif
			return err;
		}
		err = mtd->read(mtd, addrn - bufsize, bufsize, &read, twopages);
		if (err == -EUCLEAN)
			err = 0;
		if (err || read != bufsize) {
#ifdef CONFIG_DEBUG_PRINTK
			printk(PRINT_PREF "error: read failed at %#llx\n",
			       (long long)(addrn - bufsize));
#else
			;
#endif
			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) {
#ifdef CONFIG_DEBUG_PRINTK
			printk(PRINT_PREF "error: read failed at %#llx\n",
			       (long long)addr);
#else
			;
#endif
			break;
		}
		if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) {
#ifdef CONFIG_DEBUG_PRINTK
			printk(PRINT_PREF "error: verify failed at %#llx\n",
			       (long long)addr);
#else
			;
#endif
			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) {
#ifdef CONFIG_DEBUG_PRINTK
			printk(PRINT_PREF "error: read failed at %#llx\n",
			       (long long)addr0);
#else
			;
#endif
			return err;
		}
		err = mtd->read(mtd, addrn - bufsize, bufsize, &read, twopages);
		if (err == -EUCLEAN)
			err = 0;
		if (err || read != bufsize) {
#ifdef CONFIG_DEBUG_PRINTK
			printk(PRINT_PREF "error: read failed at %#llx\n",
			       (long long)(addrn - bufsize));
#else
			;
#endif
			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) {
#ifdef CONFIG_DEBUG_PRINTK
			printk(PRINT_PREF "error: read failed at %#llx\n",
			       (long long)addr);
#else
			;
#endif
			return err;
		}
		memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);
		set_random_data(boundary + pgsize, pgsize);
		if (memcmp(twopages, boundary, bufsize)) {
#ifdef CONFIG_DEBUG_PRINTK
			printk(PRINT_PREF "error: verify failed at %#llx\n",
			       (long long)addr);
#else
			;
#endif
			errcnt += 1;
		}
		next = oldnext;
	}
	return err;
}
Ejemplo n.º 14
0
static int __init fsspeed_init(void)
{
	int err, i;
	long speed;
	struct file *fp;
	mm_segment_t fs;

	printk(KERN_INFO "\n");
	printk(KERN_INFO "=================================================\n");
	printk(PRINT_PREF "rw %d PAGES using file: %s\n", count, fname);

	err = -ENOMEM;
	iobuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!iobuf) {
		printk(PRINT_PREF "error: cannot allocate memory\n");
		goto out;
	}

	simple_srand(1);
	set_random_data(iobuf, PAGE_SIZE);

	fp = filp_open(fname, O_RDWR|O_CREAT, 0600);
	if (IS_ERR(fp)) {
		printk("open file %s failed.\n", fname);
		err = PTR_ERR(fp);
		goto out;
	}

	/* Write all eraseblocks, 1 eraseblock at a time */
	printk(PRINT_PREF "testing file system write speed\n");
	fs = get_fs();
	set_fs(KERNEL_DS);
	start_timing();
	for (i = 0; i < count; ++i) {
		err = vfs_write(fp, iobuf, PAGE_SIZE, &fp->f_pos);
		if (err < 0)
			goto out2;
//		cond_resched();
	}
	stop_timing();
	speed = calc_speed();
	printk(PRINT_PREF "write speed is %ld KiB/s\n", speed);
	
	vfs_fsync(fp, fp->f_path.dentry, 0);
	invalidate_mapping_pages(fp->f_dentry->d_inode->i_mapping, 0, -1);
	vfs_llseek(fp, 0, SEEK_SET);
	
	/* Read all eraseblocks, 1 eraseblock at a time */
	printk(PRINT_PREF "testing file system read speed\n");
	start_timing();
	for (i = 0; i < count; ++i) {
		err = vfs_read(fp, iobuf, PAGE_SIZE, &fp->f_pos);
		if (err < 0)
			goto out2;
//		cond_resched();
	}
	stop_timing();
	speed = calc_speed();
	printk(PRINT_PREF "read speed is %ld KiB/s\n", speed);

	printk(PRINT_PREF "finished\n");
	err = 0;
out2:
	filp_close(fp, NULL);
	set_fs(fs);
out:
	kfree(iobuf);
	if (err)
		printk(PRINT_PREF "error %d occurred\n", err);
	printk(KERN_INFO "=================================================\n");
	return err;
}
Ejemplo n.º 15
0
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; i < ebcnt && bbt[i]; ++i)
		addr0 += mtd->erasesize;

	addrn = mtd->size;
	for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
		addrn -= mtd->erasesize;

	set_random_data(writebuf, mtd->erasesize);
	for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {
		
		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;
		}
	}
	
	if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) {
		unsigned long oldnext = next;
		
		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;
}
Ejemplo n.º 16
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 / 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);

	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;
}