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605 lines
16 KiB
605 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) International Business Machines Corp., 2006 |
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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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#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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#include <linux/seq_file.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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pr_err("\tskip_check %d\n", vol->skip_check); |
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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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else |
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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 except |
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* detailed_erase_block_info |
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*/ |
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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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/* As long as the position is less then that total number of erase blocks, |
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* we still have more to print. |
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*/ |
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static void *eraseblk_count_seq_start(struct seq_file *s, loff_t *pos) |
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{ |
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struct ubi_device *ubi = s->private; |
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if (*pos < ubi->peb_count) |
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return pos; |
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return NULL; |
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} |
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/* Since we are using the position as the iterator, we just need to check if we |
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* are done and increment the position. |
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*/ |
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static void *eraseblk_count_seq_next(struct seq_file *s, void *v, loff_t *pos) |
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{ |
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struct ubi_device *ubi = s->private; |
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(*pos)++; |
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if (*pos < ubi->peb_count) |
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return pos; |
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return NULL; |
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} |
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static void eraseblk_count_seq_stop(struct seq_file *s, void *v) |
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{ |
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} |
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static int eraseblk_count_seq_show(struct seq_file *s, void *iter) |
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{ |
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struct ubi_device *ubi = s->private; |
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struct ubi_wl_entry *wl; |
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int *block_number = iter; |
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int erase_count = -1; |
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int err; |
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/* If this is the start, print a header */ |
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if (*block_number == 0) |
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seq_puts(s, "physical_block_number\terase_count\n"); |
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err = ubi_io_is_bad(ubi, *block_number); |
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if (err) |
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return err; |
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spin_lock(&ubi->wl_lock); |
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wl = ubi->lookuptbl[*block_number]; |
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if (wl) |
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erase_count = wl->ec; |
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spin_unlock(&ubi->wl_lock); |
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if (erase_count < 0) |
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return 0; |
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seq_printf(s, "%-22d\t%-11d\n", *block_number, erase_count); |
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return 0; |
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} |
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static const struct seq_operations eraseblk_count_seq_ops = { |
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.start = eraseblk_count_seq_start, |
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.next = eraseblk_count_seq_next, |
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.stop = eraseblk_count_seq_stop, |
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.show = eraseblk_count_seq_show |
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}; |
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static int eraseblk_count_open(struct inode *inode, struct file *f) |
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{ |
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struct seq_file *s; |
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int err; |
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err = seq_open(f, &eraseblk_count_seq_ops); |
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if (err) |
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return err; |
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s = f->private_data; |
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s->private = ubi_get_device((unsigned long)inode->i_private); |
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if (!s->private) |
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return -ENODEV; |
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else |
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return 0; |
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} |
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static int eraseblk_count_release(struct inode *inode, struct file *f) |
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{ |
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struct seq_file *s = f->private_data; |
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struct ubi_device *ubi = s->private; |
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ubi_put_device(ubi); |
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return seq_release(inode, f); |
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} |
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static const struct file_operations eraseblk_count_fops = { |
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.owner = THIS_MODULE, |
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.open = eraseblk_count_open, |
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.read = seq_read, |
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.llseek = seq_lseek, |
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.release = eraseblk_count_release, |
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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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unsigned long ubi_num = ubi->ubi_num; |
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struct ubi_debug_info *d = &ubi->dbg; |
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int n; |
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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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return -EINVAL; |
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} |
|
|
|
d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir); |
|
|
|
d->dfs_chk_gen = debugfs_create_file("chk_gen", S_IWUSR, d->dfs_dir, |
|
(void *)ubi_num, &dfs_fops); |
|
|
|
d->dfs_chk_io = debugfs_create_file("chk_io", S_IWUSR, d->dfs_dir, |
|
(void *)ubi_num, &dfs_fops); |
|
|
|
d->dfs_chk_fastmap = debugfs_create_file("chk_fastmap", S_IWUSR, |
|
d->dfs_dir, (void *)ubi_num, |
|
&dfs_fops); |
|
|
|
d->dfs_disable_bgt = debugfs_create_file("tst_disable_bgt", S_IWUSR, |
|
d->dfs_dir, (void *)ubi_num, |
|
&dfs_fops); |
|
|
|
d->dfs_emulate_bitflips = debugfs_create_file("tst_emulate_bitflips", |
|
S_IWUSR, d->dfs_dir, |
|
(void *)ubi_num, |
|
&dfs_fops); |
|
|
|
d->dfs_emulate_io_failures = debugfs_create_file("tst_emulate_io_failures", |
|
S_IWUSR, d->dfs_dir, |
|
(void *)ubi_num, |
|
&dfs_fops); |
|
|
|
d->dfs_emulate_power_cut = debugfs_create_file("tst_emulate_power_cut", |
|
S_IWUSR, d->dfs_dir, |
|
(void *)ubi_num, |
|
&dfs_fops); |
|
|
|
d->dfs_power_cut_min = debugfs_create_file("tst_emulate_power_cut_min", |
|
S_IWUSR, d->dfs_dir, |
|
(void *)ubi_num, &dfs_fops); |
|
|
|
d->dfs_power_cut_max = debugfs_create_file("tst_emulate_power_cut_max", |
|
S_IWUSR, d->dfs_dir, |
|
(void *)ubi_num, &dfs_fops); |
|
|
|
debugfs_create_file("detailed_erase_block_info", S_IRUSR, d->dfs_dir, |
|
(void *)ubi_num, &eraseblk_count_fops); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* 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; |
|
}
|
|
|