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#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/delay.h>
#include <asm/div64.h>
#include <linux/err.h>
#include <linux/random.h>
#include <linux/vmalloc.h>
#undef pr_fmt
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
static int dev = 4;
module_param(dev, int, S_IRUGO);
MODULE_PARM_DESC(dev, "MTD device number to use");
static int ebcnt = 0;
static int pgcnt = 0;
static unsigned char *bbt = NULL;
static struct mtd_info *mtd = NULL;
static struct rnd_state rnd_state = {0};
static int agetest_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 agetest_scan_bad_block(void)
{
unsigned int i = 0, bad = 0;
bbt = (unsigned char *)vmalloc(ebcnt);
if (!bbt) {
pr_info("error: cannot allocate memory\n");
return -ENOMEM;
}
pr_info("scanning for bad eraseblocks first\n");
for (i = 0; i < ebcnt; ++i) {
bbt[i] = mtd_block_isbad(mtd, i * mtd->erasesize) ? 1 : 0;
if (bbt[i])
bad += 1;
cond_resched();
}
pr_info("scanned %d eraseblocks, %d are bad\n", ebcnt, bad);
return 0;
}
static int nandflash_agetest(void)
{
int err = 0;
loff_t addr = 0;
unsigned int test_blk = 10;
unsigned int op = 0;
unsigned char *readbuf = NULL;
unsigned char *writebuf = NULL;
unsigned int written = 0, read = 0;
unsigned int continue_err = 0;
unsigned int erase_time = 0;
readbuf = vmalloc(mtd->writesize);
if(!readbuf) {
pr_err("%s, alloc readbuf failed!\n", __func__);
err = -ENOMEM;
goto out;
}
writebuf = vmalloc(mtd->writesize);
if(!writebuf) {
pr_err("%s, alloc writebuf failed!\n", __func__);
err = -ENOMEM;
goto out;
}
while((test_blk < ebcnt) && bbt[test_blk]) {
test_blk ++;
}
if(test_blk >= ebcnt) {
pr_err("The whole mtd_partion are bad!\n");
err = -EINVAL;
goto out;
}
pr_info("Begin to make block %d as bad!\n", test_blk);
addr = test_blk * mtd->erasesize;
prandom_seed_state(&rnd_state, 1);
prandom_bytes_state(&rnd_state, writebuf, mtd->writesize);
err = agetest_erase_eraseblock(test_blk);
if(err) {
pr_err("the first erase failed at addr: 0x%.8x, err: %d\n", (unsigned int)addr, err);
goto out;
}
while(1) {
if(signal_pending(current))
goto out;
err = mtd_write(mtd, addr, mtd->writesize, &written, writebuf);
if(err || written != mtd->writesize) {
pr_err("write failed at addr: 0x%.8x, err: %d, written: %d, time: %d\n", (unsigned int)addr, err, written, op);
goto erase;
}
err = mtd_read(mtd, addr, mtd->writesize, &read, readbuf);
if(err || read != mtd->writesize) {
pr_err("read failed at addr: 0x%.8x, err: %d, read: %d, time: %d\n", (unsigned int)addr, err, read, op);
goto erase;
}
if(memcmp(readbuf, writebuf, mtd->writesize) != 0) {
pr_err("verify failed at addr: 0x%.8x!", (unsigned int)addr);
goto erase;
}
erase:
err = agetest_erase_eraseblock(test_blk);
if(err) {
pr_err("erase failed at addr: 0x%.8x, err: %d, time: %d\n", (unsigned int)addr, err, op);
break;
}
op += 1;
if(op % 1024 == 0)
pr_info("we have erased %d times!\n", op);
}
/*make sure the block has been erased as bad block*/
while(1) {
if(signal_pending(current))
break;
err = mtd_write(mtd, addr, mtd->writesize, &written, writebuf);
err = agetest_erase_eraseblock(test_blk);
if(err) {
continue_err ++;
if(continue_err >= 0x1000) {
pr_info("after %d times continue erase, the block has been erased as bad block!", erase_time);
break;
}
if( continue_err % 100 == 0)
pr_info("the continue_err is %d!", continue_err);
} else {
if(continue_err)
pr_info("the continue_err may be clean, old value is %d\n", continue_err);
continue_err = 0;
}
erase_time ++;
if( erase_time % 1024 == 0)
pr_info("the erase_time is %d!", erase_time);
}
pr_info("mark block %d as bad!\n", test_blk);
mtd->_block_markbad(mtd, addr);
err = 0;
out:
vfree(readbuf);
vfree(writebuf);
pr_info("agetest finished, %d(%d) operations done!\n", op, erase_time);
return err;
}
static int __init nandflash_agetest_init(void)
{
int err = 0;
uint64_t tmp = 0;
pr_info(KERN_INFO "\n");
pr_info(KERN_INFO "=================================================\n");
if (dev < 0) {
pr_info("Please specify a valid mtd-device via module parameter\n");
return -EINVAL;
}
pr_info("MTD device: %d\n", dev);
mtd = get_mtd_device(NULL, dev);
if (IS_ERR(mtd)) {
err = PTR_ERR(mtd);
pr_info("error: cannot get MTD device\n");
return err;
}
if (mtd->type != MTD_NANDFLASH) {
pr_info("this test requires NAND flash\n");
goto out;
}
tmp = mtd->size;
do_div(tmp, mtd->erasesize);
ebcnt = tmp;
pgcnt = mtd->erasesize / mtd->writesize;
pr_info("MTD device size %llu, eraseblock size %u, "
"page size %u, count of eraseblocks %u, pages per "
"eraseblock %u, OOB size %u\n",
(unsigned long long)mtd->size, mtd->erasesize,
mtd->writesize, ebcnt, pgcnt, mtd->oobsize);
err = agetest_scan_bad_block();
if (err)
goto out;
err = nandflash_agetest();
if(err) {
pr_err("stresstest failed!\n");
goto out;
}
out:
pr_info(KERN_INFO "=================================================\n");
if(bbt != NULL)
vfree(bbt);
put_mtd_device(mtd);
return -1;
}
static void __exit nandflash_agetest_exit(void)
{
return;
}
module_init(nandflash_agetest_init);
module_exit(nandflash_agetest_exit);
MODULE_DESCRIPTION("mtd_age_test");
MODULE_AUTHOR("ming.tang@spreadtrum.com");
MODULE_LICENSE("GPL");
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