481 lines
11 KiB
C
481 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2006-2008 Artem Bityutskiy
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* Copyright (C) 2006-2008 Jarkko Lavinen
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* Copyright (C) 2006-2008 Adrian Hunter
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*
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* Authors: Artem Bityutskiy, Jarkko Lavinen, Adria Hunter
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*
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* WARNING: this test program may kill your flash and your device. Do not
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* use it unless you know what you do. Authors are not responsible for any
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* damage caused by this program.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/ktime.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/err.h>
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#include <linux/mtd/mtd.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include "mtd_test.h"
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#define RETRIES 3
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static int eb = 8;
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module_param(eb, int, S_IRUGO);
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MODULE_PARM_DESC(eb, "eraseblock number within the selected MTD device");
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static int ebcnt = 32;
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module_param(ebcnt, int, S_IRUGO);
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MODULE_PARM_DESC(ebcnt, "number of consecutive eraseblocks to torture");
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static int pgcnt;
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module_param(pgcnt, int, S_IRUGO);
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MODULE_PARM_DESC(pgcnt, "number of pages per eraseblock to torture (0 => all)");
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static int dev = -EINVAL;
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module_param(dev, int, S_IRUGO);
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MODULE_PARM_DESC(dev, "MTD device number to use");
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static int gran = 512;
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module_param(gran, int, S_IRUGO);
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MODULE_PARM_DESC(gran, "how often the status information should be printed");
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static int check = 1;
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module_param(check, int, S_IRUGO);
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MODULE_PARM_DESC(check, "if the written data should be checked");
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static unsigned int cycles_count;
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module_param(cycles_count, uint, S_IRUGO);
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MODULE_PARM_DESC(cycles_count, "how many erase cycles to do "
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"(infinite by default)");
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static struct mtd_info *mtd;
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/* This buffer contains 0x555555...0xAAAAAA... pattern */
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static unsigned char *patt_5A5;
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/* This buffer contains 0xAAAAAA...0x555555... pattern */
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static unsigned char *patt_A5A;
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/* This buffer contains all 0xFF bytes */
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static unsigned char *patt_FF;
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/* This a temporary buffer is use when checking data */
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static unsigned char *check_buf;
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/* How many erase cycles were done */
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static unsigned int erase_cycles;
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static int pgsize;
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static ktime_t start, finish;
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static void report_corrupt(unsigned char *read, unsigned char *written);
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static inline void start_timing(void)
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{
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start = ktime_get();
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}
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static inline void stop_timing(void)
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{
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finish = ktime_get();
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}
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/*
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* Check that the contents of eraseblock number @enbum is equivalent to the
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* @buf buffer.
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*/
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static inline int check_eraseblock(int ebnum, unsigned char *buf)
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{
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int err, retries = 0;
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size_t read;
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loff_t addr = (loff_t)ebnum * mtd->erasesize;
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size_t len = mtd->erasesize;
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if (pgcnt) {
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addr = (loff_t)(ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
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len = pgcnt * pgsize;
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}
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retry:
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err = mtd_read(mtd, addr, len, &read, check_buf);
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if (mtd_is_bitflip(err))
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pr_err("single bit flip occurred at EB %d "
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"MTD reported that it was fixed.\n", ebnum);
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else if (err) {
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pr_err("error %d while reading EB %d, "
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"read %zd\n", err, ebnum, read);
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return err;
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}
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if (read != len) {
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pr_err("failed to read %zd bytes from EB %d, "
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"read only %zd, but no error reported\n",
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len, ebnum, read);
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return -EIO;
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}
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if (memcmp(buf, check_buf, len)) {
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pr_err("read wrong data from EB %d\n", ebnum);
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report_corrupt(check_buf, buf);
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if (retries++ < RETRIES) {
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/* Try read again */
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yield();
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pr_info("re-try reading data from EB %d\n",
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ebnum);
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goto retry;
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} else {
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pr_info("retried %d times, still errors, "
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"give-up\n", RETRIES);
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return -EINVAL;
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}
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}
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if (retries != 0)
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pr_info("only attempt number %d was OK (!!!)\n",
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retries);
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return 0;
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}
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static inline int write_pattern(int ebnum, void *buf)
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{
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int err;
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size_t written;
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loff_t addr = (loff_t)ebnum * mtd->erasesize;
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size_t len = mtd->erasesize;
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if (pgcnt) {
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addr = (loff_t)(ebnum + 1) * mtd->erasesize - pgcnt * pgsize;
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len = pgcnt * pgsize;
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}
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err = mtd_write(mtd, addr, len, &written, buf);
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if (err) {
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pr_err("error %d while writing EB %d, written %zd"
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" bytes\n", err, ebnum, written);
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return err;
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}
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if (written != len) {
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pr_info("written only %zd bytes of %zd, but no error"
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" reported\n", written, len);
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return -EIO;
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}
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return 0;
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}
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static int __init tort_init(void)
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{
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int err = 0, i, infinite = !cycles_count;
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unsigned char *bad_ebs;
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printk(KERN_INFO "\n");
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printk(KERN_INFO "=================================================\n");
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pr_info("Warning: this program is trying to wear out your "
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"flash, stop it if this is not wanted.\n");
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if (dev < 0) {
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pr_info("Please specify a valid mtd-device via module parameter\n");
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pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
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return -EINVAL;
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}
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pr_info("MTD device: %d\n", dev);
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pr_info("torture %d eraseblocks (%d-%d) of mtd%d\n",
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ebcnt, eb, eb + ebcnt - 1, dev);
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if (pgcnt)
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pr_info("torturing just %d pages per eraseblock\n",
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pgcnt);
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pr_info("write verify %s\n", check ? "enabled" : "disabled");
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mtd = get_mtd_device(NULL, dev);
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if (IS_ERR(mtd)) {
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err = PTR_ERR(mtd);
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pr_err("error: cannot get MTD device\n");
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return err;
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}
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if (mtd->writesize == 1) {
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pr_info("not NAND flash, assume page size is 512 "
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"bytes.\n");
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pgsize = 512;
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} else
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pgsize = mtd->writesize;
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if (pgcnt && (pgcnt > mtd->erasesize / pgsize || pgcnt < 0)) {
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pr_err("error: invalid pgcnt value %d\n", pgcnt);
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goto out_mtd;
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}
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err = -ENOMEM;
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patt_5A5 = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!patt_5A5)
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goto out_mtd;
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patt_A5A = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!patt_A5A)
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goto out_patt_5A5;
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patt_FF = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!patt_FF)
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goto out_patt_A5A;
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check_buf = kmalloc(mtd->erasesize, GFP_KERNEL);
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if (!check_buf)
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goto out_patt_FF;
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bad_ebs = kzalloc(ebcnt, GFP_KERNEL);
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if (!bad_ebs)
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goto out_check_buf;
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/* Initialize patterns */
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memset(patt_FF, 0xFF, mtd->erasesize);
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for (i = 0; i < mtd->erasesize / pgsize; i++) {
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if (!(i & 1)) {
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memset(patt_5A5 + i * pgsize, 0x55, pgsize);
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memset(patt_A5A + i * pgsize, 0xAA, pgsize);
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} else {
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memset(patt_5A5 + i * pgsize, 0xAA, pgsize);
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memset(patt_A5A + i * pgsize, 0x55, pgsize);
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}
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}
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err = mtdtest_scan_for_bad_eraseblocks(mtd, bad_ebs, eb, ebcnt);
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if (err)
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goto out;
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start_timing();
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while (1) {
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int i;
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void *patt;
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err = mtdtest_erase_good_eraseblocks(mtd, bad_ebs, eb, ebcnt);
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if (err)
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goto out;
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/* Check if the eraseblocks contain only 0xFF bytes */
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if (check) {
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for (i = eb; i < eb + ebcnt; i++) {
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if (bad_ebs[i - eb])
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continue;
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err = check_eraseblock(i, patt_FF);
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if (err) {
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pr_info("verify failed"
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" for 0xFF... pattern\n");
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goto out;
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}
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err = mtdtest_relax();
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if (err)
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goto out;
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}
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}
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/* Write the pattern */
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for (i = eb; i < eb + ebcnt; i++) {
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if (bad_ebs[i - eb])
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continue;
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if ((eb + erase_cycles) & 1)
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patt = patt_5A5;
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else
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patt = patt_A5A;
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err = write_pattern(i, patt);
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if (err)
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goto out;
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err = mtdtest_relax();
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if (err)
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goto out;
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}
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/* Verify what we wrote */
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if (check) {
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for (i = eb; i < eb + ebcnt; i++) {
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if (bad_ebs[i - eb])
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continue;
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if ((eb + erase_cycles) & 1)
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patt = patt_5A5;
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else
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patt = patt_A5A;
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err = check_eraseblock(i, patt);
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if (err) {
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pr_info("verify failed for %s"
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" pattern\n",
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((eb + erase_cycles) & 1) ?
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"0x55AA55..." : "0xAA55AA...");
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goto out;
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}
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err = mtdtest_relax();
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if (err)
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goto out;
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}
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}
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erase_cycles += 1;
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if (erase_cycles % gran == 0) {
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long ms;
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stop_timing();
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ms = ktime_ms_delta(finish, start);
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pr_info("%08u erase cycles done, took %lu "
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"milliseconds (%lu seconds)\n",
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erase_cycles, ms, ms / 1000);
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start_timing();
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}
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if (!infinite && --cycles_count == 0)
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break;
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}
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out:
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pr_info("finished after %u erase cycles\n",
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erase_cycles);
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kfree(bad_ebs);
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out_check_buf:
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kfree(check_buf);
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out_patt_FF:
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kfree(patt_FF);
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out_patt_A5A:
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kfree(patt_A5A);
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out_patt_5A5:
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kfree(patt_5A5);
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out_mtd:
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put_mtd_device(mtd);
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if (err)
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pr_info("error %d occurred during torturing\n", err);
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printk(KERN_INFO "=================================================\n");
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return err;
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}
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module_init(tort_init);
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static void __exit tort_exit(void)
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{
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return;
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}
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module_exit(tort_exit);
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static int countdiffs(unsigned char *buf, unsigned char *check_buf,
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unsigned offset, unsigned len, unsigned *bytesp,
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unsigned *bitsp);
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static void print_bufs(unsigned char *read, unsigned char *written, int start,
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int len);
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/*
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* Report the detailed information about how the read EB differs from what was
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* written.
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*/
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static void report_corrupt(unsigned char *read, unsigned char *written)
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{
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int i;
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int bytes, bits, pages, first;
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int offset, len;
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size_t check_len = mtd->erasesize;
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if (pgcnt)
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check_len = pgcnt * pgsize;
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bytes = bits = pages = 0;
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for (i = 0; i < check_len; i += pgsize)
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if (countdiffs(written, read, i, pgsize, &bytes,
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&bits) >= 0)
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pages++;
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pr_info("verify fails on %d pages, %d bytes/%d bits\n",
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pages, bytes, bits);
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pr_info("The following is a list of all differences between"
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" what was read from flash and what was expected\n");
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for (i = 0; i < check_len; i += pgsize) {
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cond_resched();
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bytes = bits = 0;
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first = countdiffs(written, read, i, pgsize, &bytes,
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&bits);
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if (first < 0)
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continue;
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printk("-------------------------------------------------------"
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"----------------------------------\n");
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pr_info("Page %zd has %d bytes/%d bits failing verify,"
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" starting at offset 0x%x\n",
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(mtd->erasesize - check_len + i) / pgsize,
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bytes, bits, first);
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offset = first & ~0x7;
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len = ((first + bytes) | 0x7) + 1 - offset;
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print_bufs(read, written, offset, len);
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}
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}
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static void print_bufs(unsigned char *read, unsigned char *written, int start,
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int len)
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{
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int i = 0, j1, j2;
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char *diff;
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printk("Offset Read Written\n");
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while (i < len) {
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printk("0x%08x: ", start + i);
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diff = " ";
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for (j1 = 0; j1 < 8 && i + j1 < len; j1++) {
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printk(" %02x", read[start + i + j1]);
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if (read[start + i + j1] != written[start + i + j1])
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diff = "***";
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}
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while (j1 < 8) {
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printk(" ");
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j1 += 1;
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}
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printk(" %s ", diff);
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for (j2 = 0; j2 < 8 && i + j2 < len; j2++)
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printk(" %02x", written[start + i + j2]);
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printk("\n");
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i += 8;
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}
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}
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/*
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* Count the number of differing bytes and bits and return the first differing
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* offset.
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*/
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static int countdiffs(unsigned char *buf, unsigned char *check_buf,
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unsigned offset, unsigned len, unsigned *bytesp,
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unsigned *bitsp)
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{
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unsigned i, bit;
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int first = -1;
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for (i = offset; i < offset + len; i++)
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if (buf[i] != check_buf[i]) {
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first = i;
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break;
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}
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while (i < offset + len) {
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if (buf[i] != check_buf[i]) {
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(*bytesp)++;
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bit = 1;
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while (bit < 256) {
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if ((buf[i] & bit) != (check_buf[i] & bit))
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(*bitsp)++;
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bit <<= 1;
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}
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}
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i++;
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}
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return first;
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}
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MODULE_DESCRIPTION("Eraseblock torturing module");
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MODULE_AUTHOR("Artem Bityutskiy, Jarkko Lavinen, Adrian Hunter");
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MODULE_LICENSE("GPL");
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