- 根目录:
- drivers
- mtd
- ubi
- debug.c
/*
* Copyright (c) International Business Machines Corp., 2006
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Artem Bityutskiy (Битюцкий Артём)
*/
#include "ubi.h"
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/module.h>
/**
* ubi_dump_flash - dump a region of flash.
* @ubi: UBI device description object
* @pnum: the physical eraseblock number to dump
* @offset: the starting offset within the physical eraseblock to dump
* @len: the length of the region to dump
*/
void ubi_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len)
{
int err;
size_t read;
void *buf;
loff_t addr = (loff_t)pnum * ubi->peb_size + offset;
buf = vmalloc(len);
if (!buf)
return;
err = mtd_read(ubi->mtd, addr, len, &read, buf);
if (err && err != -EUCLEAN) {
ubi_err("error %d while reading %d bytes from PEB %d:%d, read %zd bytes",
err, len, pnum, offset, read);
goto out;
}
ubi_msg("dumping %d bytes of data from PEB %d, offset %d",
len, pnum, offset);
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1);
out:
vfree(buf);
return;
}
/**
* ubi_dump_ec_hdr - dump an erase counter header.
* @ec_hdr: the erase counter header to dump
*/
void ubi_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)
{
pr_err("Erase counter header dump:\n");
pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic));
pr_err("\tversion %d\n", (int)ec_hdr->version);
pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec));
pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset));
pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset));
pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq));
pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc));
pr_err("erase counter header hexdump:\n");
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
ec_hdr, UBI_EC_HDR_SIZE, 1);
}
/**
* ubi_dump_vid_hdr - dump a volume identifier header.
* @vid_hdr: the volume identifier header to dump
*/
void ubi_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr)
{
pr_err("Volume identifier header dump:\n");
pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic));
pr_err("\tversion %d\n", (int)vid_hdr->version);
pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type);
pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag);
pr_err("\tcompat %d\n", (int)vid_hdr->compat);
pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id));
pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum));
pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size));
pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs));
pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad));
pr_err("\tsqnum %llu\n",
(unsigned long long)be64_to_cpu(vid_hdr->sqnum));
pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc));
pr_err("Volume identifier header hexdump:\n");
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
vid_hdr, UBI_VID_HDR_SIZE, 1);
}
/**
* ubi_dump_vol_info - dump volume information.
* @vol: UBI volume description object
*/
void ubi_dump_vol_info(const struct ubi_volume *vol)
{
pr_err("Volume information dump:\n");
pr_err("\tvol_id %d\n", vol->vol_id);
pr_err("\treserved_pebs %d\n", vol->reserved_pebs);
pr_err("\talignment %d\n", vol->alignment);
pr_err("\tdata_pad %d\n", vol->data_pad);
pr_err("\tvol_type %d\n", vol->vol_type);
pr_err("\tname_len %d\n", vol->name_len);
pr_err("\tusable_leb_size %d\n", vol->usable_leb_size);
pr_err("\tused_ebs %d\n", vol->used_ebs);
pr_err("\tused_bytes %lld\n", vol->used_bytes);
pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes);
pr_err("\tcorrupted %d\n", vol->corrupted);
pr_err("\tupd_marker %d\n", vol->upd_marker);
if (vol->name_len <= UBI_VOL_NAME_MAX &&
strnlen(vol->name, vol->name_len + 1) == vol->name_len) {
pr_err("\tname %s\n", vol->name);
} else {
pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
vol->name[0], vol->name[1], vol->name[2],
vol->name[3], vol->name[4]);
}
}
/**
* ubi_dump_vtbl_record - dump a &struct ubi_vtbl_record object.
* @r: the object to dump
* @idx: volume table index
*/
void ubi_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)
{
int name_len = be16_to_cpu(r->name_len);
pr_err("Volume table record %d dump:\n", idx);
pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs));
pr_err("\talignment %d\n", be32_to_cpu(r->alignment));
pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad));
pr_err("\tvol_type %d\n", (int)r->vol_type);
pr_err("\tupd_marker %d\n", (int)r->upd_marker);
pr_err("\tname_len %d\n", name_len);
if (r->name[0] == '\0') {
pr_err("\tname NULL\n");
return;
}
if (name_len <= UBI_VOL_NAME_MAX &&
strnlen(&r->name[0], name_len + 1) == name_len) {
pr_err("\tname %s\n", &r->name[0]);
} else {
pr_err("\t1st 5 characters of name: %c%c%c%c%c\n",
r->name[0], r->name[1], r->name[2], r->name[3],
r->name[4]);
}
pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc));
}
/**
* ubi_dump_av - dump a &struct ubi_ainf_volume object.
* @av: the object to dump
*/
void ubi_dump_av(const struct ubi_ainf_volume *av)
{
pr_err("Volume attaching information dump:\n");
pr_err("\tvol_id %d\n", av->vol_id);
pr_err("\thighest_lnum %d\n", av->highest_lnum);
pr_err("\tleb_count %d\n", av->leb_count);
pr_err("\tcompat %d\n", av->compat);
pr_err("\tvol_type %d\n", av->vol_type);
pr_err("\tused_ebs %d\n", av->used_ebs);
pr_err("\tlast_data_size %d\n", av->last_data_size);
pr_err("\tdata_pad %d\n", av->data_pad);
}
/**
* ubi_dump_aeb - dump a &struct ubi_ainf_peb object.
* @aeb: the object to dump
* @type: object type: 0 - not corrupted, 1 - corrupted
*/
void ubi_dump_aeb(const struct ubi_ainf_peb *aeb, int type)
{
pr_err("eraseblock attaching information dump:\n");
pr_err("\tec %d\n", aeb->ec);
pr_err("\tpnum %d\n", aeb->pnum);
if (type == 0) {
pr_err("\tlnum %d\n", aeb->lnum);
pr_err("\tscrub %d\n", aeb->scrub);
pr_err("\tsqnum %llu\n", aeb->sqnum);
}
}
/**
* ubi_dump_mkvol_req - dump a &struct ubi_mkvol_req object.
* @req: the object to dump
*/
void ubi_dump_mkvol_req(const struct ubi_mkvol_req *req)
{
char nm[17];
pr_err("Volume creation request dump:\n");
pr_err("\tvol_id %d\n", req->vol_id);
pr_err("\talignment %d\n", req->alignment);
pr_err("\tbytes %lld\n", (long long)req->bytes);
pr_err("\tvol_type %d\n", req->vol_type);
pr_err("\tname_len %d\n", req->name_len);
memcpy(nm, req->name, 16);
nm[16] = 0;
pr_err("\t1st 16 characters of name: %s\n", nm);
}
/*
* Root directory for UBI stuff in debugfs. Contains sub-directories which
* contain the stuff specific to particular UBI devices.
*/
static struct dentry *dfs_rootdir;
/**
* ubi_debugfs_init - create UBI debugfs directory.
*
* Create UBI debugfs directory. Returns zero in case of success and a negative
* error code in case of failure.
*/
int ubi_debugfs_init(void)
{
if (!IS_ENABLED(CONFIG_DEBUG_FS))
return 0;
dfs_rootdir = debugfs_create_dir("ubi", NULL);
if (IS_ERR_OR_NULL(dfs_rootdir)) {
int err = dfs_rootdir ? -ENODEV : PTR_ERR(dfs_rootdir);
ubi_err("cannot create \"ubi\" debugfs directory, error %d\n",
err);
return err;
}
return 0;
}
/**
* ubi_debugfs_exit - remove UBI debugfs directory.
*/
void ubi_debugfs_exit(void)
{
if (IS_ENABLED(CONFIG_DEBUG_FS))
debugfs_remove(dfs_rootdir);
}
/* Read an UBI debugfs file */
static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
unsigned long ubi_num = (unsigned long)file->private_data;
struct dentry *dent = file->f_path.dentry;
struct ubi_device *ubi;
struct ubi_debug_info *d;
char buf[3];
int val;
ubi = ubi_get_device(ubi_num);
if (!ubi)
return -ENODEV;
d = &ubi->dbg;
if (dent == d->dfs_chk_gen)
val = d->chk_gen;
else if (dent == d->dfs_chk_io)
val = d->chk_io;
else if (dent == d->dfs_disable_bgt)
val = d->disable_bgt;
else if (dent == d->dfs_emulate_bitflips)
val = d->emulate_bitflips;
else if (dent == d->dfs_emulate_io_failures)
val = d->emulate_io_failures;
else {
count = -EINVAL;
goto out;
}
if (val)
buf[0] = '1';
else
buf[0] = '0';
buf[1] = '\n';
buf[2] = 0x00;
count = simple_read_from_buffer(user_buf, count, ppos, buf, 2);
out:
ubi_put_device(ubi);
return count;
}
/* Write an UBI debugfs file */
static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
size_t count, loff_t *ppos)
{
unsigned long ubi_num = (unsigned long)file->private_data;
struct dentry *dent = file->f_path.dentry;
struct ubi_device *ubi;
struct ubi_debug_info *d;
size_t buf_size;
char buf[8];
int val;
ubi = ubi_get_device(ubi_num);
if (!ubi)
return -ENODEV;
d = &ubi->dbg;
buf_size = min_t(size_t, count, (sizeof(buf) - 1));
if (copy_from_user(buf, user_buf, buf_size)) {
count = -EFAULT;
goto out;
}
if (buf[0] == '1')
val = 1;
else if (buf[0] == '0')
val = 0;
else {
count = -EINVAL;
goto out;
}
if (dent == d->dfs_chk_gen)
d->chk_gen = val;
else if (dent == d->dfs_chk_io)
d->chk_io = val;
else if (dent == d->dfs_disable_bgt)
d->disable_bgt = val;
else if (dent == d->dfs_emulate_bitflips)
d->emulate_bitflips = val;
else if (dent == d->dfs_emulate_io_failures)
d->emulate_io_failures = val;
else
count = -EINVAL;
out:
ubi_put_device(ubi);
return count;
}
/* File operations for all UBI debugfs files */
static const struct file_operations dfs_fops = {
.read = dfs_file_read,
.write = dfs_file_write,
.open = simple_open,
.llseek = no_llseek,
.owner = THIS_MODULE,
};
/**
* ubi_debugfs_init_dev - initialize debugfs for an UBI device.
* @ubi: UBI device description object
*
* This function creates all debugfs files for UBI device @ubi. Returns zero in
* case of success and a negative error code in case of failure.
*/
int ubi_debugfs_init_dev(struct ubi_device *ubi)
{
int err, n;
unsigned long ubi_num = ubi->ubi_num;
const char *fname;
struct dentry *dent;
struct ubi_debug_info *d = &ubi->dbg;
if (!IS_ENABLED(CONFIG_DEBUG_FS))
return 0;
n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME,
ubi->ubi_num);
if (n == UBI_DFS_DIR_LEN) {
/* The array size is too small */
fname = UBI_DFS_DIR_NAME;
dent = ERR_PTR(-EINVAL);
goto out;
}
fname = d->dfs_dir_name;
dent = debugfs_create_dir(fname, dfs_rootdir);
if (IS_ERR_OR_NULL(dent))
goto out;
d->dfs_dir = dent;
fname = "chk_gen";
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
&dfs_fops);
if (IS_ERR_OR_NULL(dent))
goto out_remove;
d->dfs_chk_gen = dent;
fname = "chk_io";
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
&dfs_fops);
if (IS_ERR_OR_NULL(dent))
goto out_remove;
d->dfs_chk_io = dent;
fname = "tst_disable_bgt";
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
&dfs_fops);
if (IS_ERR_OR_NULL(dent))
goto out_remove;
d->dfs_disable_bgt = dent;
fname = "tst_emulate_bitflips";
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
&dfs_fops);
if (IS_ERR_OR_NULL(dent))
goto out_remove;
d->dfs_emulate_bitflips = dent;
fname = "tst_emulate_io_failures";
dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
&dfs_fops);
if (IS_ERR_OR_NULL(dent))
goto out_remove;
d->dfs_emulate_io_failures = dent;
return 0;
out_remove:
debugfs_remove_recursive(d->dfs_dir);
out:
err = dent ? PTR_ERR(dent) : -ENODEV;
ubi_err("cannot create \"%s\" debugfs file or directory, error %d\n",
fname, err);
return err;
}
/**
* dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi
* @ubi: UBI device description object
*/
void ubi_debugfs_exit_dev(struct ubi_device *ubi)
{
if (IS_ENABLED(CONFIG_DEBUG_FS))
debugfs_remove_recursive(ubi->dbg.dfs_dir);
}