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#!/bin/bash
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# Copyright 2021 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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[ -n "${ipmi_fru_init-}" ] && return
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# shellcheck disable=SC2034
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IPMI_FRU_COMMON_HEADER_INTERNAL_OFFSET_IDX=1
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# shellcheck disable=SC2034
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IPMI_FRU_COMMON_HEADER_CHASSIS_OFFSET_IDX=2
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# shellcheck disable=SC2034
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IPMI_FRU_COMMON_HEADER_BOARD_OFFSET_IDX=3
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# shellcheck disable=SC2034
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IPMI_FRU_COMMON_HEADER_PRODUCT_OFFSET_IDX=4
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# shellcheck disable=SC2034
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IPMI_FRU_COMMON_HEADER_MULTI_RECORD_OFFSET_IDX=5
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# shellcheck disable=SC2034
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IPMI_FRU_AREA_HEADER_SIZE_IDX=1
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# shellcheck disable=SC2034
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IPMI_FRU_CHECKSUM_IDX=-1
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offset_1bw() {
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local addr="$1"
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local off="$2"
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local extra="${3-0}"
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echo "w$((1+extra))@$addr $(( off & 0xff ))"
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}
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offset_2bw() {
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local addr="$1"
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local off="$2"
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local extra="${3-0}"
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echo "w$((2+extra))@$addr $(( (off >> 8) & 0xff )) $(( off & 0xff ))"
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}
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of_name_to_eeproms() {
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local names
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if ! names="$(grep -xl "$1" /sys/bus/i2c/devices/*/of_node/name)"; then
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echo "Failed to find eeproms with of_name '$1'" >&2
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return 1
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fi
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echo "${names//of_node\/name/eeprom}"
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}
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of_name_to_eeprom() {
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local eeproms
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eeproms="$(of_name_to_eeproms "$1")" || return
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if (( "$(echo "$eeproms" | wc -l)" != 1 )); then
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echo "Got more than one eeprom for '$1': $eeproms" >&2
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return 1
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fi
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echo "$eeproms"
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}
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# Each element is a `filename`
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declare -A IPMI_FRU_EEPROM_FILE=()
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# Each element is a `bus` + `addr` + `offset_bytes_func`
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declare -A IPMI_FRU_EEPROM_BUSADDR=()
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ipmi_fru_device_alloc() {
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local fdn="$1"
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local idx="$2"
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local json
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json="$(busctl -j call xyz.openbmc_project.FruDevice \
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/xyz/openbmc_project/FruDevice/"$fdn" org.freedesktop.DBus.Properties \
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GetAll s xyz.openbmc_project.FruDevice)" || return 80
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local jqq='.data[0] | (.BUS.data | tostring) + " " + (.ADDRESS.data | tostring)'
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local busaddr
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# shellcheck disable=SC2207
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busaddr=($(echo "$json" | jq -r "$jqq")) || return
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# FRU 0 is hardcoded and FruDevice does not report the correct bus for it
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# Hardcode a workaround for this specifically known bus
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if (( busaddr[0] == 0 && busaddr[1] == 0 )); then
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IPMI_FRU_EEPROM_FILE["$idx"]=/etc/fru/baseboard.fru.bin
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else
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local offset_bw=offset_2bw
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local last=0
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local rsp=0x100
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local start=$SECONDS
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# Query the FRU multiple times to ensure the return value is stabilized
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while (( last != rsp )); do
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# It shouldn't take > 0.1s to stabilize, limit instability
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if (( SECONDS - start >= 10 )); then
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echo "Timed out determining offset for ${busaddr[0]}@${busaddr[1]}" >&2
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return 1
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fi
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last=$rsp
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# shellcheck disable=SC2046
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rsp=$(i2ctransfer -f -y "${busaddr[0]}" $(offset_1bw "${busaddr[1]}" 0) r1) || return
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done
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# FRUs never start with 0xff bytes, so we can figure out addressing mode
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if (( rsp != 0xff )); then
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offset_bw=offset_1bw
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fi
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IPMI_FRU_EEPROM_BUSADDR["$idx"]="${busaddr[*]} $offset_bw"
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fi
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}
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ipmi_fru_alloc() {
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local name="$1"
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local -n ret="$2"
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# Pick the first free index to return as the allocated entry
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for (( ret = 0; ret < "${#IPMI_FRU_EEPROM_FILE[@]}"; ++ret )); do
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[ -n "${IPMI_FRU_EEPROM_FILE[*]+1}" ] || \
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[ -n "${IPMI_FRU_EEPROM_BUSADDR[*]+1}" ]|| break
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done
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if [[ "$name" =~ ^of-name:(.*)$ || "$name" =~ ^([^:]*)$ ]]; then
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local ofn="${BASH_REMATCH[1]}"
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local file
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file="$(of_name_to_eeprom "$ofn")" || return
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IPMI_FRU_EEPROM_FILE["$ret"]="$file"
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elif [[ "$name" =~ ^frudev-name:(.*)$ ]]; then
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local fdn="${BASH_REMATCH[1]}"
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local start=$SECONDS
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local file
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while (( SECONDS - start < 300 )); do
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local rc=0
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ipmi_fru_device_alloc "$fdn" "$ret" || rc=$?
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(( rc == 0 )) && break
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# Immediately return any errors, 80 is special to signify retry
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(( rc != 80 )) && return $rc
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sleep 1
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done
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else
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echo "Invalid IPMI FRU eeprom specification: $name" >&2
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return 1
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fi
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}
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ipmi_fru_free() {
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unset 'IPMI_FRU_EEPROM_FILE[$1]'
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unset 'IPMI_FRU_EEPROM_BUSADDR[$1]'
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}
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checksum() {
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local -n checksum_arr="$1"
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local checksum=0
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for byte in "${checksum_arr[@]}"; do
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checksum=$((checksum + byte))
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done
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echo $((checksum & 0xff))
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}
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fix_checksum() {
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local -n fix_checksum_arr="$1"
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old_cksum=${fix_checksum_arr[$IPMI_FRU_CHECKSUM_IDX]}
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((fix_checksum_arr[IPMI_FRU_CHECKSUM_IDX]-=$(checksum fix_checksum_arr)))
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((fix_checksum_arr[IPMI_FRU_CHECKSUM_IDX]&=0xff))
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printf 'Corrected %s checksum from 0x%02X -> 0x%02X\n' \
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"$1" "${old_cksum}" "${fix_checksum_arr[$IPMI_FRU_CHECKSUM_IDX]}" >&2
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}
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read_bytes() {
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# shellcheck disable=SC2206
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local busaddr=(${IPMI_FRU_EEPROM_BUSADDR["$1"]-})
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local file="${IPMI_FRU_EEPROM_FILE["$1"]-$1}"
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local offset="$2"
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local size="$3"
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if (( "${#busaddr[@]}" > 0)); then
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echo "Reading ${busaddr[*]} at $offset for $size" >&2
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# shellcheck disable=SC2046
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i2ctransfer -f -y "${busaddr[0]}" $("${busaddr[2]}" "${busaddr[1]}" "$offset") "r$size"
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else
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echo "Reading $file at $offset for $size" >&2
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dd if="$file" bs=1 count="$size" skip="$offset" 2>/dev/null | \
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hexdump -v -e '1/1 "%d "'
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fi
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}
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write_bytes() {
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# shellcheck disable=SC2206
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local busaddr=(${IPMI_FRU_EEPROM_BUSADDR["$1"]-})
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local file="${IPMI_FRU_EEPROM_FILE["$1"]-$1}"
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local offset="$2"
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local -n bytes_arr="$3"
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if (( "${#busaddr[@]}" > 0)); then
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echo "Writing ${busaddr[*]} at $offset for ${#bytes_arr[@]}" >&2
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# shellcheck disable=SC2046
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i2ctransfer -f -y "${busaddr[0]}" $("${busaddr[2]}" "${busaddr[1]}" "$offset" "${#bytes_arr[@]}") "${bytes_arr[@]}"
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else
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local hexstr
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hexstr="$(printf '\\x%x' "${bytes_arr[@]}")" || return
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echo "Writing $file at $offset for ${#bytes_arr[@]}" >&2
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# shellcheck disable=SC2059
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printf "$hexstr" | dd of="$file" bs=1 seek="$offset" 2>/dev/null
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fi
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}
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read_header() {
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local eeprom="$1"
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local -n header_arr="$2"
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# shellcheck disable=SC2207
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header_arr=($(read_bytes "$eeprom" 0 8)) || return
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echo "Checking $eeprom FRU Header version" >&2
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# FRU header is always version 1
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(( header_arr[0] == 1 )) || return
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echo "Checking $eeprom FRU Header checksum" >&2
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local sum
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sum="$(checksum header_arr)" || return
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# Checksums should be valid
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(( sum == 0 )) || return 10
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}
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read_area() {
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local eeprom="$1"
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local offset="$2"
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local -n area_arr="$3"
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local area_size="${4-0}"
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offset=$((offset*8))
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# shellcheck disable=SC2207
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area_arr=($(read_bytes "$eeprom" "$offset" 8)) || return
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echo "Checking $eeprom $offset FRU Area version" >&2
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# FRU Area is always version 1
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(( area_arr[0] == 1 )) || return
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if (( area_size == 0 )); then
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area_size=${area_arr[$IPMI_FRU_AREA_HEADER_SIZE_IDX]}
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fi
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# shellcheck disable=SC2207
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area_arr=($(read_bytes "$eeprom" "$offset" $((area_size*8)))) || return
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echo "Checking $eeprom $offset FRU Area checksum" >&2
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local sum
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sum="$(checksum area_arr)" || return
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# Checksums should be valid
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(( sum == 0 )) || return 10
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}
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ipmi_fru_init=1
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