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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/random.h>
#include <linux/mtd/mtd.h>
#include <linux/moduleparam.h>
struct mtd_part {
struct mtd_info mtd;
struct mtd_info *master;
loff_t offset;
struct list_head list;
};
#define CBIT(v, n) ((v) & (1 << (n)))
#define BCLR(v, n) ((v) = (v) & ~(1 << (n)))
static struct mtd_info *mtd = NULL;
static int dev = 4;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");
static int insert_biterror(unsigned char *buf)
{
unsigned int bit = 0;
unsigned int byte = 0;
while (byte < mtd->writesize) {
for (bit = 0; bit <= 7; bit++) {
if (CBIT(buf[byte], bit)) {
BCLR(buf[byte], bit);
pr_info("Inserted biterror @ %u/%u\n", byte, bit);
return 0;
}
}
byte++;
}
pr_err("biterror: Failed to find a '1' bit\n");
return -EIO;
}
static int erase_eraseblock(unsigned int ebnum)
{
int err = 0;
struct erase_info ei = {0};
ei.mtd = mtd;
ei.addr = ebnum * mtd->erasesize;
ei.len = mtd->erasesize;
err = mtd_erase(mtd, &ei);
if (err) {
pr_err("err %d while erasing EB %d\n", err, ebnum);
return err;
}
if (ei.state == MTD_ERASE_FAILED) {
pr_err("some erase error occurred at EB %d\n", ebnum);
return -EIO;
}
return 0;
}
static int write_oob(loff_t offset, unsigned char *databuf, unsigned int len, unsigned char *oobbuf, unsigned int ooblen, unsigned int mode)
{
struct mtd_oob_ops ops = {0};
int err = 0;
ops.mode = mode;
ops.len = len;
ops.retlen = 0;
ops.ooblen = ooblen;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = databuf;
ops.oobbuf = oobbuf;
err = mtd->_write_oob(mtd, offset, &ops);
if (err || ops.oobretlen != ops.ooblen || ops.retlen != ops.len) {
pr_err("write address: 0x%.8x's failed, err:%d!", (unsigned int)offset, err);
if(err == 0) {
pr_err("expect:%d , %d real:%d, %d\n", ops.len, ops.ooblen, ops.retlen, ops.oobretlen);
err = -1;
}
}
return err;
}
static int read_oob(loff_t offset, unsigned char *databuf, unsigned int len, unsigned char *oobbuf, unsigned int ooblen, unsigned int mode)
{
struct mtd_oob_ops ops = {0};
int err = 0;
ops.mode = mode;
ops.len = len;
ops.retlen = 0;
ops.ooblen = ooblen;
ops.oobretlen = 0;
ops.ooboffs = 0;
ops.datbuf = databuf;
ops.oobbuf = oobbuf;
err = mtd->_read_oob(mtd, offset, &ops);
if (err || ops.oobretlen != ops.ooblen || ops.retlen != ops.len) {
pr_err("read address: 0x%.8x failed, err:%d!\n", (unsigned int)offset, err);
if(err == 0) {
pr_err("expect:%d , %d real:%d, %d\n", ops.len, ops.ooblen, ops.retlen, ops.oobretlen);
err = -1;
} else if(err == -EUCLEAN) {
err = 0;
}
}
return err;
}
static int __init nandflash_ecctest_init(void)
{
unsigned int read_len = 0;
int err = 0;
loff_t offset = 0;
unsigned int j = 0;
struct rnd_state rnd_state;
unsigned int corrected_num = 0;
unsigned char *oobbuf_w = NULL;
unsigned char *oobbuf_r = NULL;
unsigned char *pagebuf_r = NULL;
unsigned char *pagebuf_w = NULL;
unsigned char *pagebuf_v = NULL;
struct mtd_ecc_stats stats = {0};
struct mtd_part *mtd_part = NULL;
printk("\n");
pr_info("--------------------------------------------------------------------------\n");
/*prepare work*/
mtd = get_mtd_device(NULL, 4);
if (IS_ERR(mtd)) {
err = PTR_ERR(mtd);
pr_err("Cannot get MTD device\n");
return err;
}
mtd_part = (struct mtd_part *)mtd;
if(!mtd->_block_isbad || !mtd->_block_markbad || !mtd->_read_oob || !mtd->_write_oob ||
!mtd->_read || !mtd->_write) {
pr_err("Some mtd's method may be NULL!");
goto out;
}
pagebuf_r = vmalloc(mtd->writesize);
oobbuf_r = vmalloc(mtd->oobsize);
pagebuf_w = vmalloc(mtd->writesize);
pagebuf_v = vmalloc(mtd->writesize);
oobbuf_w = vmalloc(mtd->oobsize);
if(!pagebuf_r || !oobbuf_r || !pagebuf_w || !pagebuf_v || !oobbuf_w) {
pr_err("Alloc buf failed!");
goto out;
}
//find a vailid block
while(offset < mtd->size) {
if(mtd->_block_isbad(mtd, offset)) {
offset += mtd->erasesize;
} else {
break;
}
}
if(offset >= mtd->size) {
pr_err("The whole mtd_partion are bad!\n");
goto out;
}
err = erase_eraseblock(((long)offset)/mtd->erasesize);
if(err) {
pr_err("Erase failed at EB: %d\n", ((unsigned int)offset)/mtd->erasesize);
goto out;
}
pr_info("Erase block %d successfully!\n", ((unsigned int)offset)/mtd->erasesize);
//prepare value
prandom_seed_state(&rnd_state, 1);
prandom_bytes_state(&rnd_state, oobbuf_w, mtd->oobsize);
prandom_bytes_state(&rnd_state, pagebuf_w, mtd->writesize);
memcpy(pagebuf_v, pagebuf_w, mtd->writesize);
err = write_oob(offset, pagebuf_w, mtd->writesize, oobbuf_w, mtd->oobsize, MTD_OPS_PLACE_OOB);
if(err != 0) {
pr_err("1.1 write failed!\n");
goto erase;
}
err = read_oob(offset, pagebuf_r, mtd->writesize, oobbuf_r, mtd->oobsize, MTD_OPS_PLACE_OOB);
if(err != 0) {
pr_err("1.1 read failed!\n");
goto erase;
}
if(memcmp(pagebuf_v, pagebuf_r, mtd->writesize) != 0) {
pr_err("1.1 compare page failed!\n");
goto erase;
}
memcpy(oobbuf_w, oobbuf_r, mtd->oobsize);
for(j = 0; j < mtd->writesize * 8; j ++)
{
offset += mtd->writesize;
err = insert_biterror(pagebuf_w);
if(err) {
pr_err("Insert biterror failed!\n");
goto erase;
}
pr_info("Insert %d bit-flip sucessfully!\n", j + 1);
err = write_oob(offset, pagebuf_w, mtd->writesize, oobbuf_w, mtd->oobsize, MTD_OPS_RAW);
if(err != 0) {
pr_err("2.1 write failed!\n");
goto erase;
}
stats = mtd_part->master->ecc_stats;
err = read_oob(offset, pagebuf_r, mtd->writesize, oobbuf_r, mtd->oobsize, MTD_OPS_PLACE_OOB);
if(err != 0) {
pr_err("2.1 read failed!\n");
break;
}
if(memcmp(pagebuf_v, pagebuf_r, mtd->writesize) != 0) {
pr_err("2.2 compare page failed!\n");
goto erase;
}
corrected_num = mtd_part->master->ecc_stats.corrected - stats.corrected;
if(corrected_num != (j + 1)) {
pr_err("Bit-flip num is not match, expected:%d, really:%d\n", j + 1, corrected_num);
goto erase;
}
}
pr_info("Test successfully, this system can corrected %d bit-flip at most!\n", j);
erase:
err = erase_eraseblock(((unsigned int)offset)/mtd->erasesize);
if(err) {
pr_err("1.3 erase failed at EB: %d\n", ((unsigned int)offset)/mtd->erasesize);
goto out;
}
out:
vfree(pagebuf_r);
vfree(oobbuf_r);
vfree(pagebuf_w);
vfree(oobbuf_w);
pr_info("--------------------------------------------------------------------------\n");
return -1;
}
static void __exit nandflash_ecctest_exit(void)
{
put_mtd_device(mtd);
return;
}
module_init(nandflash_ecctest_init);
module_exit(nandflash_ecctest_exit);
MODULE_DESCRIPTION("Test ecc strength");
MODULE_AUTHOR("ming.tang");
MODULE_LICENSE("GPL");
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