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