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Miguel Fuertes committed
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#!/bin/sh
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# SPDX-License-Identifier: MIT
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#
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# This script is responsible for loading firmware blobs from firmware
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# partitions on qcom devices. It will make a dir in tmp, mount all of the
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# interesting partitions there and then symlink blobs to a single dir that can
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# be then provided to the kernel. (At this time only single additional
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# directory can be provided)
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#
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# This script attempts to load everything at runtime and be as generic
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# as possible between the target devices: It should allow a single rootfs
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# to be used on multiple different devices as long as all the blobs
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# are present on dedicated partitions.
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# (Usually the case, Samsung devices ship all blobs, other devices may miss
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# venus but that still allows for WiFi and modem to work)
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#
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# Get the slot suffix for A/B devices.
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# If qbootctl is available query the active slot using that, otherwise rely on
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# the kernel cmdline to contain the slot suffix.
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# On non-A/B devices the return value will be empty.
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# https://source.android.com/docs/core/architecture/bootloader/updating#slots
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ab_get_slot() {
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if command -v qbootctl > /dev/null; then
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ab_slot_suffix=$(qbootctl -a | grep -o 'Active slot: _[ab]' | cut -d ":" -f2 | xargs) || :
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else
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ab_slot_suffix=$(grep -o 'androidboot\.slot_suffix=..' /proc/cmdline | cut -d "=" -f2) || :
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fi
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echo "$ab_slot_suffix"
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}
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# Configurations:
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# List of partitions to be mounted and inspected for blobs.
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FW_PARTITIONS="
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apnhlos
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bluetooth$(ab_get_slot)
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dsp$(ab_get_slot)
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modem$(ab_get_slot)
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persist
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vendor$(ab_get_slot)
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RADIO
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"
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# List of partitions to mount dynamic partitions from.
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SUPER_PARTITIONS="
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super
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system
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"
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# Base directory to be used to unfold the partitions into.
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BASEDIR="/run/msm-firmware-loader"
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# Preparations:
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# This script is intended to run before udev. This means that writeable fs
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# may not be available yet. Since this script only creates symlinks, it
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# uses tmpfs to work around the early-run limitations as well as to reduce
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# disk wear slightly.
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mount -o mode=755,nodev,noexec,nosuid -t tmpfs none "$BASEDIR"
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mkdir -p "$BASEDIR/mnt"
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mkdir -p "$BASEDIR/target"
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# Scanning and mounting partitions we're interested in:
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# Modern android devices use dynamic partitions for the system.
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# To gather firmware from such partitions, search for a "super"
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# or "system" partition, and if one is present, map it and try
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# to locate firmware partitions of interest inside.
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if command -v make-dynpart-mappings > /dev/null
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then
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for part in /sys/block/mmcblk*/mmcblk*p* /sys/block/sd*/sd*
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do
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if ! [ -e "$part" ]; then continue; fi;
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DEVNAME="$(grep DEVNAME "$part"/uevent | sed 's/DEVNAME=//g')"
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PARTNAME="$(grep PARTNAME "$part"/uevent | sed 's/PARTNAME=//g')"
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if [ -z "${SUPER_PARTITIONS##*"$PARTNAME"*}" ] && [ -n "$PARTNAME" ]
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then
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# system is for retrofit targets, not all devices may be
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# retrofit, in which case make-dynpart-mappings will fail.
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if ! make-dynpart-mappings "/dev/$DEVNAME"; then continue; fi;
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for dynpart in /dev/mapper/*
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do
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PARTNAME="$(basename "$dynpart")"
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if [ -z "${FW_PARTITIONS##*"$PARTNAME"*}" ] && [ -n "$PARTNAME" ]
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then
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mkdir -p "$BASEDIR/mnt/$PARTNAME"
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mount -o ro,nodev,noexec,nosuid \
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"$dynpart" "$BASEDIR/mnt/$PARTNAME"
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fi
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done
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break
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fi
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done
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fi
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# /dev/disk/by-partlabel symlinks don't exist yet, scan sysfs for names instead
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for part in /sys/block/mmcblk*/mmcblk*p* /sys/block/sd*/sd*
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do
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if ! [ -e "$part" ]; then continue; fi;
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DEVNAME="$(grep DEVNAME "$part"/uevent | sed 's/DEVNAME=//g')"
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PARTNAME="$(grep PARTNAME "$part"/uevent | sed 's/PARTNAME=//g')"
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if [ -z "${FW_PARTITIONS##*"$PARTNAME"*}" ] && [ -n "$PARTNAME" ] && [ ! -d "$BASEDIR/mnt/$PARTNAME" ]
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then
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mkdir -p "$BASEDIR/mnt/$PARTNAME"
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mount -o ro,nodev,noexec,nosuid \
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"/dev/$DEVNAME" "$BASEDIR/mnt/$PARTNAME"
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fi
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done
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# Linking blobs from all partitions:
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# Backup the preselected path, link all of the installed blobs.
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# This is needed for devices that require blobs either not present
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# on the partitions (e.g. venus on many msm8916 devices) or if
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# the device has secure-boot disabled and can run newer blobs.
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EXTRA_PATH="$(cat /sys/module/firmware_class/parameters/path)"
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if [ -d "$EXTRA_PATH" ]
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then
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for blob in "$EXTRA_PATH"/*
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do
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if ! [ -e "$blob" ]; then break; fi
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ln -s "$blob" "$BASEDIR/target/$(basename "$blob")"
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done
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fi
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# Scan through mounted partitions and symlink all of the blobs.
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# This loop ignores blobs with names already present in the
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# target to allow preinstalled blobs to override ones in the partitions.
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for blob in "$BASEDIR"/mnt/*/image/* "$BASEDIR"/mnt/*/firmware/*
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do
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if ! [ -e "$blob" ]; then continue; fi;
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DIR="$(dirname "$blob")"
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BLOBBASE="${blob##*/}"
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BLOBBASE="${BLOBBASE%.*}"
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# Skip blob prefix if it's already present.
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for prefix in "$BASEDIR/target/$BLOBBASE."*
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do
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if [ -e "$prefix" ]; then continue 2; fi
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done
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for part in "$DIR"/"$BLOBBASE"*
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do
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if [ -f "$part" ]
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then
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ln -s "$part" "$BASEDIR/target/$(basename "$part")"
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fi
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done
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done
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# Check for sns.reg in persist partition
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if [ -f "$BASEDIR"/mnt/persist/sensors/sns.reg ]
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then
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mkdir -p "$BASEDIR/target/qcom/sensors"
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ln -s "$BASEDIR"/mnt/persist/sensors/sns.reg "$BASEDIR"/target/qcom/sensors/sns.reg
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fi
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# Check WCNSS_qcom_wlan_nv.bin in persist partition
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if [ -f "$BASEDIR"/mnt/persist/WCNSS_qcom_wlan_nv.bin ]
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then
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ln -s "$BASEDIR"/mnt/persist/WCNSS_qcom_wlan_nv.bin "$BASEDIR"/target/WCNSS_qcom_wlan_nv.bin
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fi
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# Fixup the directory structure:
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# venus (video encoder/decoder) blobs are expected to be in a subdir.
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# Re-link the blobs if the venus firmware wasn't already preinstalled.
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# Different platforms expect firmware in different subdirs
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# (as in linux-firmware-qcom) so the venus dir is duplicated multiple times
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# under possible names for the script to be generic without complex detection.
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if [ -f "$BASEDIR/target/venus.mdt" ] && ! [ -d "$BASEDIR/target/qcom/venus-x" ]
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then
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mkdir -p "$BASEDIR/target/qcom/venus-x"
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for part in "$BASEDIR"/target/venus.*
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do
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ln -s "$part" "$BASEDIR/target/qcom/venus-x/$(basename "$part")"
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done
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fi
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VENUS_DIRS="
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venus-1.8
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venus-3.0
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venus-4.2
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venus-4.4
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venus-5.2
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venus-5.4
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vpu-1.0
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vpu-2.0
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"
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for vdir in $VENUS_DIRS
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do
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if ! [ -d "$BASEDIR/target/qcom/$vdir" ] && [ -f "$BASEDIR/target/venus.mdt" ]
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then
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ln -s "$BASEDIR/target/qcom/venus-x" \
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"$BASEDIR/target/qcom/$vdir"
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fi
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done
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# WCNSS_qcom_wlan_nv.bin needs to be relocated too
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if [ -h "$BASEDIR"/target/WCNSS_qcom_wlan_nv.bin ]
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then
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if ! [ -f "$BASEDIR"/target/wlan/prima/WCNSS_qcom_wlan_nv.bin ]
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then
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mkdir -p "$BASEDIR"/target/wlan/prima
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ln -s "$BASEDIR"/target/WCNSS_qcom_wlan_nv.bin "$BASEDIR"/target/wlan/prima/
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fi
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fi
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# Devices with ath10k wcn3990 wifi/bt have bluetooth firmware on a separate
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# "bluetooth" partition. Files from it need to be placed into qca/ subdir.
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# Check if bluetooth partition was mounted, and if so, link files into qca/
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if [ -d "$BASEDIR/mnt/bluetooth$(ab_get_slot)" ]
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then
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mkdir -p "$BASEDIR"/target/qca
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for btblob in "$BASEDIR/mnt/bluetooth$(ab_get_slot)/image"/*
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do
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ln -s "$btblob" "$BASEDIR"/target/qca/
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done
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fi
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# Some kernel versions expect .mbn instead of legacy .mdt
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# Symlink these files together, the kernel can autodetect the type.
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find "$BASEDIR"/target/ \
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-name '*.mdt' \
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-exec sh -c 'ln -s $0 ${0%.mdt}.mbn' {} \;
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# It's customary to define device-model-specific firmware prefix in
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# devicetree to separate similarly named but differently signed blobs
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# between different devices. This script handles those by guessing
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# the common prefix and symlinking the firmware tree to it, which
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# relies on following implications:
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# - The device uses the same firmware prefix for all blobs;
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# - All blob file names in the prefix are same as in downstream,
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# with the exception that .mbn instead of legacy .mdt may be used
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FIRMWARE_PREFIX=$(find /sys/firmware/devicetree -name "firmware-name" | head -n1 | xargs cat | xargs dirname)
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if [ -n "$FIRMWARE_PREFIX" ]
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then
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mkdir -p "$BASEDIR/target/$(dirname "$FIRMWARE_PREFIX")"
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ln -s "$BASEDIR/target" "$BASEDIR/target/$FIRMWARE_PREFIX"
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fi
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# Set the new custom firmware path:
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printf "%s" "$BASEDIR/target" > /sys/module/firmware_class/parameters/path
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