546 lines
15 KiB
C
546 lines
15 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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#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_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_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 = mtd_read(ubi->mtd, addr, len, &read, buf);
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if (err && err != -EUCLEAN) {
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ubi_err(ubi, "err %d while reading %d bytes from PEB %d:%d, read %zd bytes",
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err, len, pnum, offset, read);
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goto out;
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}
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ubi_msg(ubi, "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_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_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)
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{
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pr_err("Erase counter header dump:\n");
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pr_err("\tmagic %#08x\n", be32_to_cpu(ec_hdr->magic));
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pr_err("\tversion %d\n", (int)ec_hdr->version);
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pr_err("\tec %llu\n", (long long)be64_to_cpu(ec_hdr->ec));
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pr_err("\tvid_hdr_offset %d\n", be32_to_cpu(ec_hdr->vid_hdr_offset));
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pr_err("\tdata_offset %d\n", be32_to_cpu(ec_hdr->data_offset));
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pr_err("\timage_seq %d\n", be32_to_cpu(ec_hdr->image_seq));
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pr_err("\thdr_crc %#08x\n", be32_to_cpu(ec_hdr->hdr_crc));
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pr_err("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_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_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr)
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{
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pr_err("Volume identifier header dump:\n");
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pr_err("\tmagic %08x\n", be32_to_cpu(vid_hdr->magic));
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pr_err("\tversion %d\n", (int)vid_hdr->version);
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pr_err("\tvol_type %d\n", (int)vid_hdr->vol_type);
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pr_err("\tcopy_flag %d\n", (int)vid_hdr->copy_flag);
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pr_err("\tcompat %d\n", (int)vid_hdr->compat);
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pr_err("\tvol_id %d\n", be32_to_cpu(vid_hdr->vol_id));
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pr_err("\tlnum %d\n", be32_to_cpu(vid_hdr->lnum));
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pr_err("\tdata_size %d\n", be32_to_cpu(vid_hdr->data_size));
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pr_err("\tused_ebs %d\n", be32_to_cpu(vid_hdr->used_ebs));
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pr_err("\tdata_pad %d\n", be32_to_cpu(vid_hdr->data_pad));
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pr_err("\tsqnum %llu\n",
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(unsigned long long)be64_to_cpu(vid_hdr->sqnum));
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pr_err("\thdr_crc %08x\n", be32_to_cpu(vid_hdr->hdr_crc));
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pr_err("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_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_dump_vol_info(const struct ubi_volume *vol)
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{
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pr_err("Volume information dump:\n");
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pr_err("\tvol_id %d\n", vol->vol_id);
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pr_err("\treserved_pebs %d\n", vol->reserved_pebs);
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pr_err("\talignment %d\n", vol->alignment);
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pr_err("\tdata_pad %d\n", vol->data_pad);
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pr_err("\tvol_type %d\n", vol->vol_type);
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pr_err("\tname_len %d\n", vol->name_len);
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pr_err("\tusable_leb_size %d\n", vol->usable_leb_size);
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pr_err("\tused_ebs %d\n", vol->used_ebs);
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pr_err("\tused_bytes %lld\n", vol->used_bytes);
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pr_err("\tlast_eb_bytes %d\n", vol->last_eb_bytes);
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pr_err("\tcorrupted %d\n", vol->corrupted);
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pr_err("\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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pr_err("\tname %s\n", vol->name);
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} else {
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pr_err("\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_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_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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pr_err("Volume table record %d dump:\n", idx);
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pr_err("\treserved_pebs %d\n", be32_to_cpu(r->reserved_pebs));
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pr_err("\talignment %d\n", be32_to_cpu(r->alignment));
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pr_err("\tdata_pad %d\n", be32_to_cpu(r->data_pad));
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pr_err("\tvol_type %d\n", (int)r->vol_type);
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pr_err("\tupd_marker %d\n", (int)r->upd_marker);
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pr_err("\tname_len %d\n", name_len);
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if (r->name[0] == '\0') {
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pr_err("\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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pr_err("\tname %s\n", &r->name[0]);
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} else {
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pr_err("\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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pr_err("\tcrc %#08x\n", be32_to_cpu(r->crc));
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}
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/**
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* ubi_dump_av - dump a &struct ubi_ainf_volume object.
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* @av: the object to dump
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*/
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void ubi_dump_av(const struct ubi_ainf_volume *av)
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{
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pr_err("Volume attaching information dump:\n");
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pr_err("\tvol_id %d\n", av->vol_id);
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pr_err("\thighest_lnum %d\n", av->highest_lnum);
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pr_err("\tleb_count %d\n", av->leb_count);
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pr_err("\tcompat %d\n", av->compat);
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pr_err("\tvol_type %d\n", av->vol_type);
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pr_err("\tused_ebs %d\n", av->used_ebs);
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pr_err("\tlast_data_size %d\n", av->last_data_size);
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pr_err("\tdata_pad %d\n", av->data_pad);
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}
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/**
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* ubi_dump_aeb - dump a &struct ubi_ainf_peb object.
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* @aeb: 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_dump_aeb(const struct ubi_ainf_peb *aeb, int type)
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{
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pr_err("eraseblock attaching information dump:\n");
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pr_err("\tec %d\n", aeb->ec);
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pr_err("\tpnum %d\n", aeb->pnum);
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if (type == 0) {
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pr_err("\tlnum %d\n", aeb->lnum);
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pr_err("\tscrub %d\n", aeb->scrub);
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pr_err("\tsqnum %llu\n", aeb->sqnum);
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}
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}
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/**
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* ubi_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_dump_mkvol_req(const struct ubi_mkvol_req *req)
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{
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char nm[17];
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pr_err("Volume creation request dump:\n");
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pr_err("\tvol_id %d\n", req->vol_id);
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pr_err("\talignment %d\n", req->alignment);
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pr_err("\tbytes %lld\n", (long long)req->bytes);
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pr_err("\tvol_type %d\n", req->vol_type);
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pr_err("\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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pr_err("\t1st 16 characters of name: %s\n", nm);
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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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if (!IS_ENABLED(CONFIG_DEBUG_FS))
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return 0;
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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 ? PTR_ERR(dfs_rootdir) : -ENODEV;
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pr_err("UBI error: 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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if (IS_ENABLED(CONFIG_DEBUG_FS))
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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[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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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_chk_fastmap)
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val = d->chk_fastmap;
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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 if (dent == d->dfs_emulate_power_cut) {
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snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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} else if (dent == d->dfs_power_cut_min) {
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snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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} else if (dent == d->dfs_power_cut_max) {
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snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max);
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count = simple_read_from_buffer(user_buf, count, ppos,
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buf, strlen(buf));
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goto out;
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}
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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] = {0};
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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 (dent == d->dfs_power_cut_min) {
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if (kstrtouint(buf, 0, &d->power_cut_min) != 0)
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count = -EINVAL;
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goto out;
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} else if (dent == d->dfs_power_cut_max) {
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if (kstrtouint(buf, 0, &d->power_cut_max) != 0)
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count = -EINVAL;
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goto out;
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} else if (dent == d->dfs_emulate_power_cut) {
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if (kstrtoint(buf, 0, &val) != 0)
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count = -EINVAL;
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d->emulate_power_cut = val;
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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_chk_fastmap)
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d->chk_fastmap = 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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/* 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 = simple_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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if (!IS_ENABLED(CONFIG_DEBUG_FS))
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return 0;
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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 = "chk_fastmap";
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dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
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&dfs_fops);
|
|
if (IS_ERR_OR_NULL(dent))
|
|
goto out_remove;
|
|
d->dfs_chk_fastmap = 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;
|
|
|
|
fname = "tst_emulate_power_cut";
|
|
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_power_cut = dent;
|
|
|
|
fname = "tst_emulate_power_cut_min";
|
|
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_power_cut_min = dent;
|
|
|
|
fname = "tst_emulate_power_cut_max";
|
|
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_power_cut_max = dent;
|
|
|
|
return 0;
|
|
|
|
out_remove:
|
|
debugfs_remove_recursive(d->dfs_dir);
|
|
out:
|
|
err = dent ? PTR_ERR(dent) : -ENODEV;
|
|
ubi_err(ubi, "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);
|
|
}
|
|
|
|
/**
|
|
* ubi_dbg_power_cut - emulate a power cut if it is time to do so
|
|
* @ubi: UBI device description object
|
|
* @caller: Flags set to indicate from where the function is being called
|
|
*
|
|
* Returns non-zero if a power cut was emulated, zero if not.
|
|
*/
|
|
int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
|
|
{
|
|
unsigned int range;
|
|
|
|
if ((ubi->dbg.emulate_power_cut & caller) == 0)
|
|
return 0;
|
|
|
|
if (ubi->dbg.power_cut_counter == 0) {
|
|
ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min;
|
|
|
|
if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
|
|
range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
|
|
ubi->dbg.power_cut_counter += prandom_u32() % range;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ubi->dbg.power_cut_counter--;
|
|
if (ubi->dbg.power_cut_counter)
|
|
return 0;
|
|
|
|
ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX");
|
|
ubi_ro_mode(ubi);
|
|
return 1;
|
|
}
|