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// SPDX-License-Identifier: GPL-2.0-only
#include <common.h>
#include <command.h>
#include <malloc.h>
#include <getopt.h>
#include <fs.h>
#include <fcntl.h>
#include <ioctl.h>
#include <linux/mtd/mtd.h>
#include <mtd/mtd-peb.h>
static int bitflip_mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, void *buf)
{
int ret_code;
if (mtd->_read_oob) {
struct mtd_oob_ops ops = {
.len = len,
.datbuf = buf,
};
ret_code = mtd->_read_oob(mtd, from, &ops);
} else {
ret_code = mtd->_read(mtd, from, len, retlen, buf);
}
return ret_code;
}
static int do_nand_bitflip(int argc, char *argv[])
{
int opt, ret, fd;
static struct mtd_info_user meminfo;
int block = 0;
int random = 0;
int num_bitflips = 1;
loff_t offset = 0, roffset;
int check = 0;
size_t r;
void *buf;
while ((opt = getopt(argc, argv, "b:rn:o:c")) > 0) {
switch (opt) {
case 'r':
random = 1;
break;
case 'n':
num_bitflips = simple_strtoul(optarg, NULL, 0);
break;
case 'b':
block = simple_strtoul(optarg, NULL, 0);
break;
case 'o':
offset = strtoull_suffix(optarg, NULL, 0);
break;
case 'c':
check = 1;
break;
default:
return COMMAND_ERROR_USAGE;
}
}
if (optind >= argc)
return COMMAND_ERROR_USAGE;
fd = open(argv[optind], O_RDWR);
if (fd < 0)
return fd;
ret = ioctl(fd, MEMGETINFO, &meminfo);
close(fd);
if (ret)
return ret;
block += mtd_div_by_eb(offset, meminfo.mtd);
offset = mtd_mod_by_eb(offset, meminfo.mtd);
if ((int)offset % meminfo.mtd->writesize) {
printf("offset has to be pagesize aligned\n");
return 1;
}
if (!check) {
ret = mtd_peb_create_bitflips(meminfo.mtd, block, offset, meminfo.writesize,
num_bitflips, random, 1);
if (ret) {
printf("Creating bitflips failed with: %s\n", strerror(-ret));
return ret;
}
}
buf = xzalloc(meminfo.writesize);
roffset = (loff_t)block * meminfo.mtd->erasesize + offset;
ret = bitflip_mtd_read(meminfo.mtd, roffset, meminfo.writesize, &r, buf);
if (ret > 0) {
printf("page at block %d, offset 0x%08llx has %d bitflips%s\n",
block, offset, ret,
ret >= meminfo.mtd->bitflip_threshold ? ", needs cleanup" : "");
} else if (!ret) {
printf("No bitflips found on block %d, offset 0x%08llx\n", block, offset);
} else {
printf("Reading block %d, offset 0x%08llx failed with: %s\n", block, offset,
strerror(-ret));
}
free(buf);
return 0;
}
BAREBOX_CMD_HELP_START(nand_bitflip)
BAREBOX_CMD_HELP_TEXT("This command creates bitflips on Nand pages.")
BAREBOX_CMD_HELP_TEXT("Options:")
BAREBOX_CMD_HELP_OPT ("-b <block>", "block to work on")
BAREBOX_CMD_HELP_OPT ("-c\t", "Check only for bitflips")
BAREBOX_CMD_HELP_OPT ("-o <offset>", "offset in Nand")
BAREBOX_CMD_HELP_OPT ("-r\t", "flip random bits")
BAREBOX_CMD_HELP_OPT ("-n <numbitflips>", "Specify maximum number of bitflips to generate")
BAREBOX_CMD_HELP_END
BAREBOX_CMD_START(nand_bitflip)
.cmd = do_nand_bitflip,
BAREBOX_CMD_DESC("Create bitflips on Nand pages")
BAREBOX_CMD_OPTS("NANDDEV")
BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
BAREBOX_CMD_HELP(cmd_nand_bitflip_help)
BAREBOX_CMD_END
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