Quelle dev-needs.sh Sprache: Shell

#! /bin/sh
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2020, Google LLC. All rights reserved.
# Author: Saravana Kannan <saravanak@google.com>

function help() {
cat << EOF
Usage: $(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 a
shell.

The script takes as input a list of one or more device directories under
/sys/devices and then lists the probe dependency chain (suppliers and
parents) of these devices. It does a breadth first search of the dependency
chain, so the last entry in the output is close to the root of the
dependency 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 change
what information is listed in the output. If the requested information is
not 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 added
function 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 added
function 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_device
ALLOW_NO_DRIVER=0
ALLOW_DEVLINKS=1
ALLOW_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
shift
done

function detail_chosen() {
detail $1 $2
}

if [ $# -eq 0 ]
then
help
exit 1
fi

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=0
while [ $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")
fi
done

# 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

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