From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- scripts/dev-needs.sh | 315 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 315 insertions(+) create mode 100755 scripts/dev-needs.sh (limited to 'scripts/dev-needs.sh') diff --git a/scripts/dev-needs.sh b/scripts/dev-needs.sh new file mode 100755 index 000000000..454cc304f --- /dev/null +++ b/scripts/dev-needs.sh @@ -0,0 +1,315 @@ +#! /bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2020, Google LLC. All rights reserved. +# Author: Saravana Kannan + +function help() { + cat << EOF +Usage: $(basename $0) [-c|-d|-m|-f] [filter options] + +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 -- cgit v1.3.1