[mirror_ubuntu-bionic-kernel.git] / drivers / mtd / tests / 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include "mtd_test.h"

#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 = -EINVAL;
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);
}

/*
 * 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;
	loff_t addr = (loff_t)ebnum * mtd->erasesize;
	size_t len = mtd->erasesize;

	if (pgcnt) {
		addr = (loff_t)(ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
		len = pgcnt * pgsize;
	}

retry:
	err = mtd_read(mtd, addr, len, &read, check_buf);
	if (mtd_is_bitflip(err))
		pr_err("single bit flip occurred at EB %d "
		       "MTD reported that it was fixed.\n", ebnum);
	else if (err) {
		pr_err("error %d while reading EB %d, "
		       "read %zd\n", err, ebnum, read);
		return err;
	}

	if (read != len) {
		pr_err("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)) {
		pr_err("read wrong data from EB %d\n", ebnum);
		report_corrupt(check_buf, buf);

		if (retries++ < RETRIES) {
			/* Try read again */
			yield();
			pr_info("re-try reading data from EB %d\n",
			       ebnum);
			goto retry;
		} else {
			pr_info("retried %d times, still errors, "
			       "give-up\n", RETRIES);
			return -EINVAL;
		}
	}

	if (retries != 0)
		pr_info("only attempt number %d was OK (!!!)\n",
		       retries);

	return 0;
}

static inline int write_pattern(int ebnum, void *buf)
{
	int err;
	size_t written;
	loff_t addr = (loff_t)ebnum * mtd->erasesize;
	size_t len = mtd->erasesize;

	if (pgcnt) {
		addr = (loff_t)(ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
		len = pgcnt * pgsize;
	}
	err = mtd_write(mtd, addr, len, &written, buf);
	if (err) {
		pr_err("error %d while writing EB %d, written %zd"
		      " bytes\n", err, ebnum, written);
		return err;
	}
	if (written != len) {
		pr_info("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;
	unsigned char *bad_ebs;

	printk(KERN_INFO "\n");
	printk(KERN_INFO "=================================================\n");
	pr_info("Warning: this program is trying to wear out your "
	       "flash, stop it if this is not wanted.\n");

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

	pr_info("MTD device: %d\n", dev);
	pr_info("torture %d eraseblocks (%d-%d) of mtd%d\n",
	       ebcnt, eb, eb + ebcnt - 1, dev);
	if (pgcnt)
		pr_info("torturing just %d pages per eraseblock\n",
			pgcnt);
	pr_info("write verify %s\n", check ? "enabled" : "disabled");

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

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

	if (pgcnt && (pgcnt > mtd->erasesize / pgsize || pgcnt < 0)) {
		pr_err("error: invalid pgcnt value %d\n", pgcnt);
		goto out_mtd;
	}

	err = -ENOMEM;
	patt_5A5 = kmalloc(mtd->erasesize, GFP_KERNEL);
	if (!patt_5A5)
		goto out_mtd;

	patt_A5A = kmalloc(mtd->erasesize, GFP_KERNEL);
	if (!patt_A5A)
		goto out_patt_5A5;

	patt_FF = kmalloc(mtd->erasesize, GFP_KERNEL);
	if (!patt_FF)
		goto out_patt_A5A;

	check_buf = kmalloc(mtd->erasesize, GFP_KERNEL);
	if (!check_buf)
		goto out_patt_FF;

	bad_ebs = kzalloc(ebcnt, GFP_KERNEL);
	if (!bad_ebs)
		goto out_check_buf;

	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);
		}
	}

	err = mtdtest_scan_for_bad_eraseblocks(mtd, bad_ebs, eb, ebcnt);
	if (err)
		goto out;

	start_timing();
	while (1) {
		int i;
		void *patt;

		err = mtdtest_erase_good_eraseblocks(mtd, bad_ebs, eb, ebcnt);
		if (err)
			goto out;

		/* 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) {
					pr_info("verify failed"
					       " for 0xFF... pattern\n");
					goto out;
				}

				err = mtdtest_relax();
				if (err)
					goto out;
			}
		}

		/* 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;

			err = mtdtest_relax();
			if (err)
				goto out;
		}

		/* 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) {
					pr_info("verify failed for %s"
					       " pattern\n",
					       ((eb + erase_cycles) & 1) ?
					       "0x55AA55..." : "0xAA55AA...");
					goto out;
				}

				err = mtdtest_relax();
				if (err)
					goto out;
			}
		}

		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;
			pr_info("%08u erase cycles done, took %lu "
			       "milliseconds (%lu seconds)\n",
			       erase_cycles, ms, ms / 1000);
			start_timing();
		}

		if (!infinite && --cycles_count == 0)
			break;
	}
out:

	pr_info("finished after %u erase cycles\n",
	       erase_cycles);
	kfree(bad_ebs);
out_check_buf:
	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)
		pr_info("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++;

	pr_info("verify fails on %d pages, %d bytes/%d bits\n",
	       pages, bytes, bits);
	pr_info("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");

		pr_info("Page %zd 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");
Commit	Line	Data
4db451a7 AB	1	/*
	2	* Copyright (C) 2006-2008 Artem Bityutskiy
	3	* Copyright (C) 2006-2008 Jarkko Lavinen
	4	* Copyright (C) 2006-2008 Adrian Hunter
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License version 2 as published by
	8	* the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14	*
	15	* You should have received a copy of the GNU General Public License along with
	16	* this program; see the file COPYING. If not, write to the Free Software
	17	* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	18	*
	19	* Authors: Artem Bityutskiy, Jarkko Lavinen, Adria Hunter
	20	*
	21	* WARNING: this test program may kill your flash and your device. Do not
	22	* use it unless you know what you do. Authors are not responsible for any
	23	* damage caused by this program.
	24	*/
	25
95637c3a VN	26	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
95637c3a VN	27
4db451a7 AB	28	#include <linux/init.h>
	29	#include <linux/module.h>
	30	#include <linux/moduleparam.h>
	31	#include <linux/err.h>
	32	#include <linux/mtd/mtd.h>
5a0e3ad6	33	#include <linux/slab.h>
4db451a7	34	#include <linux/sched.h>
6cf78358	35	#include "mtd_test.h"
4db451a7	36
4db451a7 AB	37	#define RETRIES 3
	38
	39	static int eb = 8;
	40	module_param(eb, int, S_IRUGO);
	41	MODULE_PARM_DESC(eb, "eraseblock number within the selected MTD device");
	42
	43	static int ebcnt = 32;
	44	module_param(ebcnt, int, S_IRUGO);
	45	MODULE_PARM_DESC(ebcnt, "number of consecutive eraseblocks to torture");
	46
	47	static int pgcnt;
	48	module_param(pgcnt, int, S_IRUGO);
	49	MODULE_PARM_DESC(pgcnt, "number of pages per eraseblock to torture (0 => all)");
	50
7406060e	51	static int dev = -EINVAL;
4db451a7 AB	52	module_param(dev, int, S_IRUGO);
	53	MODULE_PARM_DESC(dev, "MTD device number to use");
	54
	55	static int gran = 512;
	56	module_param(gran, int, S_IRUGO);
	57	MODULE_PARM_DESC(gran, "how often the status information should be printed");
	58
	59	static int check = 1;
	60	module_param(check, int, S_IRUGO);
	61	MODULE_PARM_DESC(check, "if the written data should be checked");
	62
	63	static unsigned int cycles_count;
	64	module_param(cycles_count, uint, S_IRUGO);
	65	MODULE_PARM_DESC(cycles_count, "how many erase cycles to do "
	66	"(infinite by default)");
	67
	68	static struct mtd_info *mtd;
	69
	70	/* This buffer contains 0x555555...0xAAAAAA... pattern */
	71	static unsigned char *patt_5A5;
	72	/* This buffer contains 0xAAAAAA...0x555555... pattern */
	73	static unsigned char *patt_A5A;
	74	/* This buffer contains all 0xFF bytes */
	75	static unsigned char *patt_FF;
	76	/* This a temporary buffer is use when checking data */
	77	static unsigned char *check_buf;
	78	/* How many erase cycles were done */
	79	static unsigned int erase_cycles;
	80
	81	static int pgsize;
	82	static struct timeval start, finish;
	83
	84	static void report_corrupt(unsigned char read, unsigned char written);
	85
	86	static inline void start_timing(void)
	87	{
	88	do_gettimeofday(&start);
	89	}
	90
	91	static inline void stop_timing(void)
	92	{
	93	do_gettimeofday(&finish);
	94	}
	95
4db451a7 AB	96	/*
	97	* Check that the contents of eraseblock number @enbum is equivalent to the
	98	* @buf buffer.
	99	*/
	100	static inline int check_eraseblock(int ebnum, unsigned char *buf)
	101	{
	102	int err, retries = 0;
30fa9848	103	size_t read;
b9da8bae	104	loff_t addr = (loff_t)ebnum * mtd->erasesize;
4db451a7 AB	105	size_t len = mtd->erasesize;
	106
	107	if (pgcnt) {
b9da8bae	108	addr = (loff_t)(ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
4db451a7 AB	109	len = pgcnt * pgsize;
	110	}
	111
	112	retry:
329ad399	113	err = mtd_read(mtd, addr, len, &read, check_buf);
d57f4054	114	if (mtd_is_bitflip(err))
95637c3a	115	pr_err("single bit flip occurred at EB %d "
4db451a7 AB	116	"MTD reported that it was fixed.\n", ebnum);
4db451a7 AB	117	else if (err) {
95637c3a	118	pr_err("error %d while reading EB %d, "
4db451a7 AB	119	"read %zd\n", err, ebnum, read);
	120	return err;
	121	}
	122
	123	if (read != len) {
95637c3a	124	pr_err("failed to read %zd bytes from EB %d, "
4db451a7 AB	125	"read only %zd, but no error reported\n",
	126	len, ebnum, read);
	127	return -EIO;
	128	}
	129
	130	if (memcmp(buf, check_buf, len)) {
95637c3a	131	pr_err("read wrong data from EB %d\n", ebnum);
4db451a7 AB	132	report_corrupt(check_buf, buf);
	133
	134	if (retries++ < RETRIES) {
	135	/* Try read again */
	136	yield();
95637c3a	137	pr_info("re-try reading data from EB %d\n",
4db451a7 AB	138	ebnum);
	139	goto retry;
	140	} else {
95637c3a	141	pr_info("retried %d times, still errors, "
4db451a7 AB	142	"give-up\n", RETRIES);
	143	return -EINVAL;
	144	}
	145	}
	146
	147	if (retries != 0)
95637c3a	148	pr_info("only attempt number %d was OK (!!!)\n",
4db451a7 AB	149	retries);
	150
	151	return 0;
	152	}
	153
	154	static inline int write_pattern(int ebnum, void *buf)
	155	{
	156	int err;
30fa9848	157	size_t written;
b9da8bae	158	loff_t addr = (loff_t)ebnum * mtd->erasesize;
4db451a7 AB	159	size_t len = mtd->erasesize;
	160
	161	if (pgcnt) {
b9da8bae	162	addr = (loff_t)(ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
4db451a7 AB	163	len = pgcnt * pgsize;
4db451a7 AB	164	}
eda95cbf	165	err = mtd_write(mtd, addr, len, &written, buf);
4db451a7	166	if (err) {
95637c3a	167	pr_err("error %d while writing EB %d, written %zd"
4db451a7 AB	168	" bytes\n", err, ebnum, written);
	169	return err;
	170	}
	171	if (written != len) {
95637c3a	172	pr_info("written only %zd bytes of %zd, but no error"
4db451a7 AB	173	" reported\n", written, len);
	174	return -EIO;
	175	}
	176
	177	return 0;
	178	}
	179
	180	static int __init tort_init(void)
	181	{
	182	int err = 0, i, infinite = !cycles_count;
6cf78358	183	unsigned char *bad_ebs;
4db451a7 AB	184
	185	printk(KERN_INFO "\n");
	186	printk(KERN_INFO "=================================================\n");
95637c3a	187	pr_info("Warning: this program is trying to wear out your "
4db451a7	188	"flash, stop it if this is not wanted.\n");
7406060e WS	189
7406060e WS	190	if (dev < 0) {
064a7694	191	pr_info("Please specify a valid mtd-device via module parameter\n");
95637c3a	192	pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
7406060e WS	193	return -EINVAL;
	194	}
	195
95637c3a VN	196	pr_info("MTD device: %d\n", dev);
95637c3a VN	197	pr_info("torture %d eraseblocks (%d-%d) of mtd%d\n",
4db451a7 AB	198	ebcnt, eb, eb + ebcnt - 1, dev);
4db451a7 AB	199	if (pgcnt)
95637c3a	200	pr_info("torturing just %d pages per eraseblock\n",
4db451a7	201	pgcnt);
95637c3a	202	pr_info("write verify %s\n", check ? "enabled" : "disabled");
4db451a7 AB	203
	204	mtd = get_mtd_device(NULL, dev);
	205	if (IS_ERR(mtd)) {
	206	err = PTR_ERR(mtd);
95637c3a	207	pr_err("error: cannot get MTD device\n");
4db451a7 AB	208	return err;
	209	}
	210
	211	if (mtd->writesize == 1) {
95637c3a	212	pr_info("not NAND flash, assume page size is 512 "
4db451a7 AB	213	"bytes.\n");
	214	pgsize = 512;
	215	} else
	216	pgsize = mtd->writesize;
	217
	218	if (pgcnt && (pgcnt > mtd->erasesize / pgsize \|\| pgcnt < 0)) {
95637c3a	219	pr_err("error: invalid pgcnt value %d\n", pgcnt);
4db451a7 AB	220	goto out_mtd;
	221	}
	222
	223	err = -ENOMEM;
	224	patt_5A5 = kmalloc(mtd->erasesize, GFP_KERNEL);
221b1bd3	225	if (!patt_5A5)
4db451a7	226	goto out_mtd;
4db451a7 AB	227
4db451a7 AB	228	patt_A5A = kmalloc(mtd->erasesize, GFP_KERNEL);
221b1bd3	229	if (!patt_A5A)
4db451a7	230	goto out_patt_5A5;
4db451a7 AB	231
4db451a7 AB	232	patt_FF = kmalloc(mtd->erasesize, GFP_KERNEL);
221b1bd3	233	if (!patt_FF)
4db451a7	234	goto out_patt_A5A;
4db451a7 AB	235
4db451a7 AB	236	check_buf = kmalloc(mtd->erasesize, GFP_KERNEL);
221b1bd3	237	if (!check_buf)
4db451a7	238	goto out_patt_FF;
221b1bd3	239
6cf78358	240	bad_ebs = kzalloc(ebcnt, GFP_KERNEL);
221b1bd3 AC	241	if (!bad_ebs)
221b1bd3 AC	242	goto out_check_buf;
4db451a7 AB	243
	244	err = 0;
	245
	246	/* Initialize patterns */
	247	memset(patt_FF, 0xFF, mtd->erasesize);
	248	for (i = 0; i < mtd->erasesize / pgsize; i++) {
	249	if (!(i & 1)) {
	250	memset(patt_5A5 + i * pgsize, 0x55, pgsize);
	251	memset(patt_A5A + i * pgsize, 0xAA, pgsize);
	252	} else {
	253	memset(patt_5A5 + i * pgsize, 0xAA, pgsize);
	254	memset(patt_A5A + i * pgsize, 0x55, pgsize);
	255	}
	256	}
	257
6cf78358 AM	258	err = mtdtest_scan_for_bad_eraseblocks(mtd, bad_ebs, eb, ebcnt);
	259	if (err)
	260	goto out;
4db451a7 AB	261
	262	start_timing();
	263	while (1) {
	264	int i;
	265	void *patt;
	266
68f29815 BN	267	err = mtdtest_erase_good_eraseblocks(mtd, bad_ebs, eb, ebcnt);
	268	if (err)
	269	goto out;
4db451a7 AB	270
	271	/* Check if the eraseblocks contain only 0xFF bytes */
	272	if (check) {
	273	for (i = eb; i < eb + ebcnt; i++) {
	274	if (bad_ebs[i - eb])
	275	continue;
	276	err = check_eraseblock(i, patt_FF);
	277	if (err) {
95637c3a	278	pr_info("verify failed"
4db451a7 AB	279	" for 0xFF... pattern\n");
	280	goto out;
	281	}
2a6a28e7 RW	282
	283	err = mtdtest_relax();
	284	if (err)
	285	goto out;
4db451a7 AB	286	}
	287	}
	288
	289	/* Write the pattern */
	290	for (i = eb; i < eb + ebcnt; i++) {
	291	if (bad_ebs[i - eb])
	292	continue;
	293	if ((eb + erase_cycles) & 1)
	294	patt = patt_5A5;
	295	else
	296	patt = patt_A5A;
	297	err = write_pattern(i, patt);
	298	if (err)
	299	goto out;
2a6a28e7 RW	300
	301	err = mtdtest_relax();
	302	if (err)
	303	goto out;
4db451a7 AB	304	}
	305
	306	/* Verify what we wrote */
	307	if (check) {
	308	for (i = eb; i < eb + ebcnt; i++) {
	309	if (bad_ebs[i - eb])
	310	continue;
	311	if ((eb + erase_cycles) & 1)
	312	patt = patt_5A5;
	313	else
	314	patt = patt_A5A;
	315	err = check_eraseblock(i, patt);
	316	if (err) {
95637c3a	317	pr_info("verify failed for %s"
4db451a7 AB	318	" pattern\n",
	319	((eb + erase_cycles) & 1) ?
	320	"0x55AA55..." : "0xAA55AA...");
	321	goto out;
	322	}
2a6a28e7 RW	323
	324	err = mtdtest_relax();
	325	if (err)
	326	goto out;
4db451a7 AB	327	}
	328	}
	329
	330	erase_cycles += 1;
	331
	332	if (erase_cycles % gran == 0) {
	333	long ms;
	334
	335	stop_timing();
	336	ms = (finish.tv_sec - start.tv_sec) * 1000 +
	337	(finish.tv_usec - start.tv_usec) / 1000;
95637c3a	338	pr_info("%08u erase cycles done, took %lu "
4db451a7 AB	339	"milliseconds (%lu seconds)\n",
	340	erase_cycles, ms, ms / 1000);
	341	start_timing();
	342	}
	343
	344	if (!infinite && --cycles_count == 0)
	345	break;
	346	}
	347	out:
	348
95637c3a	349	pr_info("finished after %u erase cycles\n",
4db451a7	350	erase_cycles);
221b1bd3 AC	351	kfree(bad_ebs);
221b1bd3 AC	352	out_check_buf:
4db451a7 AB	353	kfree(check_buf);
	354	out_patt_FF:
	355	kfree(patt_FF);
	356	out_patt_A5A:
	357	kfree(patt_A5A);
	358	out_patt_5A5:
	359	kfree(patt_5A5);
	360	out_mtd:
	361	put_mtd_device(mtd);
	362	if (err)
95637c3a	363	pr_info("error %d occurred during torturing\n", err);
4db451a7 AB	364	printk(KERN_INFO "=================================================\n");
	365	return err;
	366	}
	367	module_init(tort_init);
	368
	369	static void __exit tort_exit(void)
	370	{
	371	return;
	372	}
	373	module_exit(tort_exit);
	374
	375	static int countdiffs(unsigned char buf, unsigned char check_buf,
	376	unsigned offset, unsigned len, unsigned *bytesp,
	377	unsigned *bitsp);
	378	static void print_bufs(unsigned char read, unsigned char written, int start,
	379	int len);
	380
	381	/*
	382	* Report the detailed information about how the read EB differs from what was
	383	* written.
	384	*/
	385	static void report_corrupt(unsigned char read, unsigned char written)
	386	{
	387	int i;
	388	int bytes, bits, pages, first;
	389	int offset, len;
	390	size_t check_len = mtd->erasesize;
	391
	392	if (pgcnt)
	393	check_len = pgcnt * pgsize;
	394
	395	bytes = bits = pages = 0;
	396	for (i = 0; i < check_len; i += pgsize)
	397	if (countdiffs(written, read, i, pgsize, &bytes,
	398	&bits) >= 0)
	399	pages++;
	400
95637c3a	401	pr_info("verify fails on %d pages, %d bytes/%d bits\n",
4db451a7	402	pages, bytes, bits);
95637c3a	403	pr_info("The following is a list of all differences between"
4db451a7 AB	404	" what was read from flash and what was expected\n");
	405
	406	for (i = 0; i < check_len; i += pgsize) {
	407	cond_resched();
	408	bytes = bits = 0;
	409	first = countdiffs(written, read, i, pgsize, &bytes,
	410	&bits);
	411	if (first < 0)
	412	continue;
	413
	414	printk("-------------------------------------------------------"
	415	"----------------------------------\n");
	416
95637c3a	417	pr_info("Page %zd has %d bytes/%d bits failing verify,"
4db451a7 AB	418	" starting at offset 0x%x\n",
	419	(mtd->erasesize - check_len + i) / pgsize,
	420	bytes, bits, first);
	421
	422	offset = first & ~0x7;
	423	len = ((first + bytes) \| 0x7) + 1 - offset;
	424
	425	print_bufs(read, written, offset, len);
	426	}
	427	}
	428
	429	static void print_bufs(unsigned char read, unsigned char written, int start,
	430	int len)
	431	{
	432	int i = 0, j1, j2;
	433	char *diff;
	434
	435	printk("Offset Read Written\n");
	436	while (i < len) {
	437	printk("0x%08x: ", start + i);
	438	diff = " ";
	439	for (j1 = 0; j1 < 8 && i + j1 < len; j1++) {
	440	printk(" %02x", read[start + i + j1]);
	441	if (read[start + i + j1] != written[start + i + j1])
	442	diff = "***";
	443	}
	444
	445	while (j1 < 8) {
	446	printk(" ");
	447	j1 += 1;
	448	}
	449
	450	printk(" %s ", diff);
	451
	452	for (j2 = 0; j2 < 8 && i + j2 < len; j2++)
	453	printk(" %02x", written[start + i + j2]);
	454	printk("\n");
	455	i += 8;
	456	}
	457	}
	458
	459	/*
	460	* Count the number of differing bytes and bits and return the first differing
	461	* offset.
	462	*/
	463	static int countdiffs(unsigned char buf, unsigned char check_buf,
	464	unsigned offset, unsigned len, unsigned *bytesp,
	465	unsigned *bitsp)
	466	{
	467	unsigned i, bit;
	468	int first = -1;
	469
	470	for (i = offset; i < offset + len; i++)
	471	if (buf[i] != check_buf[i]) {
	472	first = i;
	473	break;
	474	}
	475
	476	while (i < offset + len) {
	477	if (buf[i] != check_buf[i]) {
	478	(*bytesp)++;
	479	bit = 1;
	480	while (bit < 256) {
	481	if ((buf[i] & bit) != (check_buf[i] & bit))
482	(*bitsp)++;
483	bit <<= 1;
484	}
485	}
486	i++;
487	}
488
489	return first;
490	}
491
492	MODULE_DESCRIPTION("Eraseblock torturing module");
493	MODULE_AUTHOR("Artem Bityutskiy, Jarkko Lavinen, Adrian Hunter");
494	MODULE_LICENSE("GPL");