forked from Minki/linux
30fa98480b
MTD functions always assign the 'retlen' argument to 0 at the very
beginning - the callers do not have to do this.
I used the following semantic patch to find these places:
@@
identifier retlen;
expression a, b, c, d, e;
constant C;
type T;
@@
(
- retlen = C;
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T
-retlen = C
+ retlen
;
)
... when != retlen
when exists
(
mtd_read(a, b, c, &retlen, d)
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mtd_write(a, b, c, &retlen, d)
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mtd_panic_write(a, b, c, &retlen, d)
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mtd_point(a, b, c, &retlen, d, e)
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mtd_read_fact_prot_reg(a, b, c, &retlen, d)
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mtd_write_user_prot_reg(a, b, c, &retlen, d)
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mtd_read_user_prot_reg(a, b, c, &retlen, d)
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mtd_writev(a, b, c, d, &retlen)
)
I ran it twice, because there were cases of double zero assigments
in mtd tests. Then I went through the patch to verify that spatch
did not find any false positives.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
529 lines
12 KiB
C
529 lines
12 KiB
C
/*
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* Copyright (C) 2006-2007 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; see the file COPYING. If not, write to the Free Software
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* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Test sub-page read and write on MTD device.
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* Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
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*
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*/
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#include <linux/init.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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#define PRINT_PREF KERN_INFO "mtd_subpagetest: "
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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 struct mtd_info *mtd;
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static unsigned char *writebuf;
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static unsigned char *readbuf;
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static unsigned char *bbt;
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static int subpgsize;
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static int bufsize;
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static int ebcnt;
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static int pgcnt;
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static int errcnt;
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static unsigned long next = 1;
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static inline unsigned int simple_rand(void)
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{
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next = next * 1103515245 + 12345;
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return (unsigned int)((next / 65536) % 32768);
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}
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static inline void simple_srand(unsigned long seed)
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{
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next = seed;
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}
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static void set_random_data(unsigned char *buf, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i)
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buf[i] = simple_rand();
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}
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static inline void clear_data(unsigned char *buf, size_t len)
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{
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memset(buf, 0, len);
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}
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static int erase_eraseblock(int ebnum)
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{
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int err;
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struct erase_info ei;
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loff_t addr = ebnum * mtd->erasesize;
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memset(&ei, 0, sizeof(struct erase_info));
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ei.mtd = mtd;
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ei.addr = addr;
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ei.len = mtd->erasesize;
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err = mtd_erase(mtd, &ei);
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if (err) {
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printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum);
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return err;
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}
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if (ei.state == MTD_ERASE_FAILED) {
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printk(PRINT_PREF "some erase error occurred at EB %d\n",
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ebnum);
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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 erase_whole_device(void)
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{
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int err;
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unsigned int i;
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printk(PRINT_PREF "erasing whole device\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = erase_eraseblock(i);
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if (err)
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return err;
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cond_resched();
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}
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printk(PRINT_PREF "erased %u eraseblocks\n", i);
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return 0;
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}
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static int write_eraseblock(int ebnum)
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{
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size_t written;
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int err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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set_random_data(writebuf, subpgsize);
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err = mtd_write(mtd, addr, subpgsize, &written, writebuf);
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if (unlikely(err || written != subpgsize)) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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(long long)addr);
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if (written != subpgsize) {
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printk(PRINT_PREF " write size: %#x\n", subpgsize);
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printk(PRINT_PREF " written: %#zx\n", written);
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}
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return err ? err : -1;
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}
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addr += subpgsize;
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set_random_data(writebuf, subpgsize);
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err = mtd_write(mtd, addr, subpgsize, &written, writebuf);
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if (unlikely(err || written != subpgsize)) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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(long long)addr);
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if (written != subpgsize) {
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printk(PRINT_PREF " write size: %#x\n", subpgsize);
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printk(PRINT_PREF " written: %#zx\n", written);
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}
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return err ? err : -1;
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}
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return err;
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}
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static int write_eraseblock2(int ebnum)
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{
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size_t written;
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int err = 0, k;
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loff_t addr = ebnum * mtd->erasesize;
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for (k = 1; k < 33; ++k) {
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if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
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break;
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set_random_data(writebuf, subpgsize * k);
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err = mtd_write(mtd, addr, subpgsize * k, &written, writebuf);
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if (unlikely(err || written != subpgsize * k)) {
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printk(PRINT_PREF "error: write failed at %#llx\n",
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(long long)addr);
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if (written != subpgsize) {
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printk(PRINT_PREF " write size: %#x\n",
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subpgsize * k);
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printk(PRINT_PREF " written: %#08zx\n",
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written);
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}
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return err ? err : -1;
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}
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addr += subpgsize * k;
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}
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return err;
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}
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static void print_subpage(unsigned char *p)
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{
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int i, j;
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for (i = 0; i < subpgsize; ) {
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for (j = 0; i < subpgsize && j < 32; ++i, ++j)
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printk("%02x", *p++);
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printk("\n");
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}
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}
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static int verify_eraseblock(int ebnum)
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{
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size_t read;
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int err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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set_random_data(writebuf, subpgsize);
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clear_data(readbuf, subpgsize);
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err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
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if (unlikely(err || read != subpgsize)) {
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if (mtd_is_bitflip(err) && read == subpgsize) {
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printk(PRINT_PREF "ECC correction at %#llx\n",
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(long long)addr);
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err = 0;
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} else {
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printk(PRINT_PREF "error: read failed at %#llx\n",
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(long long)addr);
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return err ? err : -1;
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}
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}
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if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
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printk(PRINT_PREF "error: verify failed at %#llx\n",
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(long long)addr);
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printk(PRINT_PREF "------------- written----------------\n");
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print_subpage(writebuf);
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printk(PRINT_PREF "------------- read ------------------\n");
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print_subpage(readbuf);
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printk(PRINT_PREF "-------------------------------------\n");
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errcnt += 1;
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}
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addr += subpgsize;
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set_random_data(writebuf, subpgsize);
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clear_data(readbuf, subpgsize);
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err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
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if (unlikely(err || read != subpgsize)) {
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if (mtd_is_bitflip(err) && read == subpgsize) {
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printk(PRINT_PREF "ECC correction at %#llx\n",
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(long long)addr);
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err = 0;
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} else {
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printk(PRINT_PREF "error: read failed at %#llx\n",
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(long long)addr);
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return err ? err : -1;
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}
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}
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if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
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printk(PRINT_PREF "error: verify failed at %#llx\n",
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(long long)addr);
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printk(PRINT_PREF "------------- written----------------\n");
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print_subpage(writebuf);
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printk(PRINT_PREF "------------- read ------------------\n");
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print_subpage(readbuf);
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printk(PRINT_PREF "-------------------------------------\n");
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errcnt += 1;
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}
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return err;
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}
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static int verify_eraseblock2(int ebnum)
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{
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size_t read;
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int err = 0, k;
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loff_t addr = ebnum * mtd->erasesize;
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for (k = 1; k < 33; ++k) {
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if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize)
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break;
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set_random_data(writebuf, subpgsize * k);
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clear_data(readbuf, subpgsize * k);
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err = mtd_read(mtd, addr, subpgsize * k, &read, readbuf);
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if (unlikely(err || read != subpgsize * k)) {
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if (mtd_is_bitflip(err) && read == subpgsize * k) {
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printk(PRINT_PREF "ECC correction at %#llx\n",
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(long long)addr);
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err = 0;
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} else {
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printk(PRINT_PREF "error: read failed at "
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"%#llx\n", (long long)addr);
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return err ? err : -1;
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}
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}
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if (unlikely(memcmp(readbuf, writebuf, subpgsize * k))) {
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printk(PRINT_PREF "error: verify failed at %#llx\n",
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(long long)addr);
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errcnt += 1;
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}
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addr += subpgsize * k;
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}
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return err;
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}
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static int verify_eraseblock_ff(int ebnum)
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{
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uint32_t j;
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size_t read;
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int err = 0;
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loff_t addr = ebnum * mtd->erasesize;
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memset(writebuf, 0xff, subpgsize);
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for (j = 0; j < mtd->erasesize / subpgsize; ++j) {
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clear_data(readbuf, subpgsize);
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err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
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if (unlikely(err || read != subpgsize)) {
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if (mtd_is_bitflip(err) && read == subpgsize) {
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printk(PRINT_PREF "ECC correction at %#llx\n",
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(long long)addr);
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err = 0;
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} else {
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printk(PRINT_PREF "error: read failed at "
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"%#llx\n", (long long)addr);
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return err ? err : -1;
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}
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}
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if (unlikely(memcmp(readbuf, writebuf, subpgsize))) {
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printk(PRINT_PREF "error: verify 0xff failed at "
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"%#llx\n", (long long)addr);
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errcnt += 1;
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}
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addr += subpgsize;
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}
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return err;
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}
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static int verify_all_eraseblocks_ff(void)
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{
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int err;
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unsigned int i;
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printk(PRINT_PREF "verifying all eraseblocks for 0xff\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = verify_eraseblock_ff(i);
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if (err)
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return err;
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if (i % 256 == 0)
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printk(PRINT_PREF "verified up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "verified %u eraseblocks\n", i);
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return 0;
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}
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static int is_block_bad(int ebnum)
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{
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loff_t addr = ebnum * mtd->erasesize;
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int ret;
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ret = mtd_block_isbad(mtd, addr);
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if (ret)
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printk(PRINT_PREF "block %d is bad\n", ebnum);
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return ret;
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}
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static int scan_for_bad_eraseblocks(void)
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{
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int i, bad = 0;
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bbt = kzalloc(ebcnt, GFP_KERNEL);
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if (!bbt) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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return -ENOMEM;
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}
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printk(PRINT_PREF "scanning for bad eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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bbt[i] = is_block_bad(i) ? 1 : 0;
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if (bbt[i])
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bad += 1;
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cond_resched();
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}
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printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad);
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return 0;
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}
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static int __init mtd_subpagetest_init(void)
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{
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int err = 0;
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uint32_t i;
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uint64_t tmp;
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printk(KERN_INFO "\n");
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printk(KERN_INFO "=================================================\n");
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if (dev < 0) {
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printk(PRINT_PREF "Please specify a valid mtd-device via module paramter\n");
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printk(KERN_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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printk(PRINT_PREF "MTD device: %d\n", dev);
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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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printk(PRINT_PREF "error: cannot get MTD device\n");
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return err;
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}
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if (mtd->type != MTD_NANDFLASH) {
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printk(PRINT_PREF "this test requires NAND flash\n");
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goto out;
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}
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subpgsize = mtd->writesize >> mtd->subpage_sft;
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tmp = mtd->size;
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do_div(tmp, mtd->erasesize);
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ebcnt = tmp;
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pgcnt = mtd->erasesize / mtd->writesize;
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printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, "
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"page size %u, subpage size %u, count of eraseblocks %u, "
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"pages per eraseblock %u, OOB size %u\n",
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(unsigned long long)mtd->size, mtd->erasesize,
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mtd->writesize, subpgsize, ebcnt, pgcnt, mtd->oobsize);
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err = -ENOMEM;
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bufsize = subpgsize * 32;
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writebuf = kmalloc(bufsize, GFP_KERNEL);
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if (!writebuf) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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goto out;
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}
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readbuf = kmalloc(bufsize, GFP_KERNEL);
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if (!readbuf) {
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printk(PRINT_PREF "error: cannot allocate memory\n");
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goto out;
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}
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err = scan_for_bad_eraseblocks();
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if (err)
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goto out;
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err = erase_whole_device();
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if (err)
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goto out;
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printk(PRINT_PREF "writing whole device\n");
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simple_srand(1);
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = write_eraseblock(i);
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if (unlikely(err))
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goto out;
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if (i % 256 == 0)
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printk(PRINT_PREF "written up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "written %u eraseblocks\n", i);
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simple_srand(1);
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printk(PRINT_PREF "verifying all eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = verify_eraseblock(i);
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if (unlikely(err))
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goto out;
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if (i % 256 == 0)
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printk(PRINT_PREF "verified up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "verified %u eraseblocks\n", i);
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err = erase_whole_device();
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if (err)
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goto out;
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err = verify_all_eraseblocks_ff();
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if (err)
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goto out;
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/* Write all eraseblocks */
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simple_srand(3);
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printk(PRINT_PREF "writing whole device\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = write_eraseblock2(i);
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if (unlikely(err))
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goto out;
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if (i % 256 == 0)
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printk(PRINT_PREF "written up to eraseblock %u\n", i);
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cond_resched();
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}
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printk(PRINT_PREF "written %u eraseblocks\n", i);
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/* Check all eraseblocks */
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simple_srand(3);
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printk(PRINT_PREF "verifying all eraseblocks\n");
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for (i = 0; i < ebcnt; ++i) {
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if (bbt[i])
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continue;
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err = verify_eraseblock2(i);
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if (unlikely(err))
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goto out;
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if (i % 256 == 0)
|
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printk(PRINT_PREF "verified up to eraseblock %u\n", i);
|
|
cond_resched();
|
|
}
|
|
printk(PRINT_PREF "verified %u eraseblocks\n", i);
|
|
|
|
err = erase_whole_device();
|
|
if (err)
|
|
goto out;
|
|
|
|
err = verify_all_eraseblocks_ff();
|
|
if (err)
|
|
goto out;
|
|
|
|
printk(PRINT_PREF "finished with %d errors\n", errcnt);
|
|
|
|
out:
|
|
kfree(bbt);
|
|
kfree(readbuf);
|
|
kfree(writebuf);
|
|
put_mtd_device(mtd);
|
|
if (err)
|
|
printk(PRINT_PREF "error %d occurred\n", err);
|
|
printk(KERN_INFO "=================================================\n");
|
|
return err;
|
|
}
|
|
module_init(mtd_subpagetest_init);
|
|
|
|
static void __exit mtd_subpagetest_exit(void)
|
|
{
|
|
return;
|
|
}
|
|
module_exit(mtd_subpagetest_exit);
|
|
|
|
MODULE_DESCRIPTION("Subpage test module");
|
|
MODULE_AUTHOR("Adrian Hunter");
|
|
MODULE_LICENSE("GPL");
|