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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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function help() { cat << EOFUsage: $(basename $0) [-c|-d|-m|-f] [filter options] <list of devices>
This script needs to be run on the target device once it has booted to ashell.
The script takes as input a list of one or more device directories under/sys/devices and then lists the probe dependency chain (suppliers andparents) of these devices. It does a breadth first search of the dependencychain, so the last entry in the output is close to the root of thedependency chain.
By default it lists the full path to the devices under /sys/devices.
It also takes an optional modifier flag as the first parameter to changewhat information is listed in the output. If the requested information isnot available, the device name is printed.
-c lists the compatible string of the dependencies -d lists the driver name of the dependencies that have probed -m lists the module name of the dependencies that have a module -f list the firmware node path of the dependencies -g list the dependencies as edges and nodes for graphviz -t list the dependencies as edges for tsort
The filter options provide a way to filter out some dependencies: --allow-no-driver By default dependencies that don't have a driver attached are ignored. This is to avoid following device links to "class" devices that are created when the consumer probes (as in, not a probe dependency). If you want to follow these links anyway, use this flag.
--exclude-devlinks Don't follow device links when tracking probe dependencies.
--exclude-parents Don't follow parent devices when tracking probe dependencies.
EOF}
function dev_to_detail() { local i=0 while [ $i -lt ${#OUT_LIST[@]} ] do local C=${OUT_LIST[i]} local S=${OUT_LIST[i+1]} local D="'$(detail_chosen $C $S)'" if [ ! -z "$D" ] then # This weirdness is needed to work with toybox when # using the -t option. printf '%05u\t%s\n' ${i} "$D" | tr -d \' fi i=$((i+2)) done}
function already_seen() { local i=0 while [ $i -lt ${#OUT_LIST[@]} ] do if [ "$1" = "${OUT_LIST[$i]}" ] then # if-statement treats 0 (no-error) as true return 0 fi i=$(($i+2)) done
# if-statement treats 1 (error) as false return 1}
# Return 0 (no-error/true) if parent was addedfunction add_parent() {
if [ ${ALLOW_PARENTS} -eq 0 ] then return 1 fi
local CON=$1 # $CON could be a symlink path. So, we need to find the real path and # then go up one level to find the real parent. local PARENT=$(realpath $CON/..)
while [ ! -e ${PARENT}/driver ] do if [ "$PARENT" = "/sys/devices" ] then return 1 fi PARENT=$(realpath $PARENT/..) done
CONSUMERS+=($PARENT) OUT_LIST+=(${CON} ${PARENT}) return 0}
# Return 0 (no-error/true) if one or more suppliers were addedfunction add_suppliers() { local CON=$1 local RET=1
if [ ${ALLOW_DEVLINKS} -eq 0 ] then return 1 fi
SUPPLIER_LINKS=$(ls -1d $CON/supplier:* 2>/dev/null) for SL in $SUPPLIER_LINKS; do SYNC_STATE=$(cat $SL/sync_state_only)
# sync_state_only links are proxy dependencies. # They can also have cycles. So, don't follow them. if [ "$SYNC_STATE" != '0' ] then continue fi
SUPPLIER=$(realpath $SL/supplier)
if [ ! -e $SUPPLIER/driver -a ${ALLOW_NO_DRIVER} -eq 0 ] then continue fi
CONSUMERS+=($SUPPLIER) OUT_LIST+=(${CON} ${SUPPLIER}) RET=0 done
return $RET}
function detail_compat() { f=$1/of_node/compatible if [ -e $f ] then echo -n $(cat $f) else echo -n $1 fi}
function detail_module() { f=$1/driver/module if [ -e $f ] then echo -n $(basename $(realpath $f)) else echo -n $1 fi}
function detail_driver() { f=$1/driver if [ -e $f ] then echo -n $(basename $(realpath $f)) else echo -n $1 fi}
function detail_fwnode() { f=$1/firmware_node if [ ! -e $f ] then f=$1/of_node fi
if [ -e $f ] then echo -n $(realpath $f) else echo -n $1 fi}
function detail_graphviz() { if [ "$2" != "ROOT" ] then echo -n "\"$(basename $2)\"->\"$(basename $1)\"" else echo -n "\"$(basename $1)\"" fi}
function detail_tsort() { echo -n "\"$2\" \"$1\""}
function detail_device() { echo -n $1; }
alias detail=detail_deviceALLOW_NO_DRIVER=0ALLOW_DEVLINKS=1ALLOW_PARENTS=1
while [ $# -gt 0 ]do ARG=$1 case $ARG in --help) help exit 0 ;; -c) alias detail=detail_compat ;; -m) alias detail=detail_module ;; -d) alias detail=detail_driver ;; -f) alias detail=detail_fwnode ;; -g) alias detail=detail_graphviz ;; -t) alias detail=detail_tsort ;; --allow-no-driver) ALLOW_NO_DRIVER=1 ;; --exclude-devlinks) ALLOW_DEVLINKS=0 ;; --exclude-parents) ALLOW_PARENTS=0 ;; *) # Stop at the first argument that's not an option. break ;; esac shiftdone
function detail_chosen() { detail $1 $2}
if [ $# -eq 0 ]then help exit 1fi
CONSUMERS=($@)OUT_LIST=()
# Do a breadth first, non-recursive tracking of suppliers. The parent is also# considered a "supplier" as a device can't probe without its parent.i=0while [ $i -lt ${#CONSUMERS[@]} ]do CONSUMER=$(realpath ${CONSUMERS[$i]}) i=$(($i+1))
if already_seen ${CONSUMER} then continue fi
# If this is not a device with a driver, we don't care about its # suppliers. if [ ! -e ${CONSUMER}/driver -a ${ALLOW_NO_DRIVER} -eq 0 ] then continue fi
ROOT=1
# Add suppliers to CONSUMERS list and output the consumer details. # # We don't need to worry about a cycle in the dependency chain causing # infinite loops. That's because the kernel doesn't allow cycles in # device links unless it's a sync_state_only device link. And we ignore # sync_state_only device links inside add_suppliers. if add_suppliers ${CONSUMER} then ROOT=0 fi
if add_parent ${CONSUMER} then ROOT=0 fi
if [ $ROOT -eq 1 ] then OUT_LIST+=(${CONSUMER} "ROOT") fidone
# Can NOT combine sort and uniq using sort -suk2 because stable sort in toybox# isn't really stable.dev_to_detail | sort -k2 -k1 | uniq -f 1 | sort | cut -f2-
exit 0