160 lines
4.2 KiB
Bash
Executable File
160 lines
4.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SPDX-License-Identifier: GPL-2.0-only
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LANG=C
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# Some tools emit errors that don't matter (bugs in lspci/PCI firmware and lsusb).
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# To shown them anyway (e.g. for debugging) comment next line.
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exec 2>/dev/null
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if [ "$1" = "-h" ]; then
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printf "Usage: $0 [-h | path to dmesg log]
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This script tries to find USB ports compatible with USB2/EHCI debug devices and
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helps you to find their physical locations. To that end, attach at least one
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uniquely identifiable device to a USB port and run this script. The device needs
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to be visible in the output of \"lsusb -t\" (debug devices are often *not*!).
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After determining compatibility of the USB controllers the script will print the
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devices attached to the debug port as shown by lsusb. If nothing shows up simply
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switch ports and repeat the process.
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Note: usually only one port is supported for debugging.\n"
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exit 0
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fi
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uid=`id -u`
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if [ "$uid" -ne 0 ]; then
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echo "Must be run as root. Exiting."
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exit 1
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fi
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dmesgfile=$1
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find_devs_in_tree () {
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bus=$1
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port=$2
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busstr=`printf "Bus %02d" "$bus"`
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portstr="Port $port"
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hubs_to_ignore="8087:0020 8087:0024"
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reqlvl=1
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found=
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# Iterate over the output of lsusb -t because it contains the physical port numbers
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while IFS='' read -r line; do
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# We need to keep track of the current bus "branch"
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# Look out for lines starting with /: (that indicate a bus)
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if [ "${line#*/:}" != "$line" ]; then
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if [ "${line#*$busstr}" != "$line" ]; then
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cur_bus=$busstr
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else
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cur_bus=
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fi
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continue
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fi
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# Skip all lines not belonging to the wanted bus number
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if [ "$cur_bus" != "$busstr" ]; then
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continue
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fi
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# Calculate current USB tier/level
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spaces="${line%%[!' ']*}"
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curlvl=$((${#spaces} / 4))
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if [ $curlvl -ne $reqlvl ]; then
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continue
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fi
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# Fetch USB IDs of the current device
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dev=`echo ${line#*Dev } | cut -d ',' -f 1`
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lsusbline=`lsusb -s "$bus":"$dev"`
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if [[ ! "$lsusbline" =~ .*([[:xdigit:]]{4}:[[:xdigit:]]{4}) ]]; then
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printf "Unexpected output from \"%s\": \"%s\"\n" "lsusb -s $bus:$dev" "$usbline"
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exit 1
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fi
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ids=${BASH_REMATCH[1]}
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# Skip over rate matching hubs
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if [[ "$hubs_to_ignore" == *"$ids"* ]]; then
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((reqlvl += 1))
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continue
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fi
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# Check for matching physical USB port
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if [ "${line#*$portstr}" != "$line" ]; then
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echo "$lsusbline"
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return
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fi
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done<< EOF
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$(lsusb -t)
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EOF
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if [ -z "$found" ]; then
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echo "none"
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fi
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}
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debug_lspci_devs=`lspci -nvvD |
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grep -i "^[0-9a-f]\|debug port" |
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grep -iB1 --no-group-separator "debug port" |
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grep -vi "debug port" |
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cut -f 1 -d" " |
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sort |
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xargs echo`
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if [ -z "$debug_lspci_devs" ]; then
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printf "No USB controller with debug capability found by lspci.\n
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Possible reasons: lspci too old, USB controller does not support a debug device, ... Exiting.\n"
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exit 1
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fi
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printf "The following PCI devices support a USB debug port (says lspci): $debug_lspci_devs\n"
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debug_dmesg_devs_with_port=`( test -z "$dmesgfile" &&
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dmesg ||
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cat "$dmesgfile") |
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grep -i "ehci.*debug port" |
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sed "s/.* \([0-9a-f]*:*[0-9a-f]\{2\}:[0-9a-f]\{2\}\.[0-9a-f]\).*ebug port /\1 /" |
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sort`
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debug_dmesg_devs=`echo "$debug_dmesg_devs_with_port" |
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cut -f 1 -d" " |
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xargs echo`
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if [ -z "$debug_dmesg_devs" ]; then
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printf "dmesg does not show any supported ports.\n
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Possible reasons: dmesg scrolled off, kernel too old, USB controller does not support a debug device, ... Exiting.\n
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Note: You can specify a file containing kernel messages as an argument to this program (e.g. /var/log/dmesg)."
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exit 1
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fi
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if [ "$debug_lspci_devs" != "$debug_dmesg_devs" ]; then
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echo "lspci and the kernel do not agree on USB debug device support. Exiting."
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exit 1
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fi
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printf "and the kernel agrees, good.\n\n"
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while true; do
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for dev in $debug_dmesg_devs; do
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bus=`lsusb -v |
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grep "^Bus\|iSerial.*" |
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grep -B1 --no-group-separator "iSerial.*$dev" |
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grep "^Bus" |
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sed "s/Bus *0*\([0-9a-f]*\).*/\1/"`
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port=`echo "$debug_dmesg_devs_with_port" |
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grep "^$dev" |
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cut -f 2 -d" "`
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echo "Device(s) currently connected to the debug-capable port $port on PCI device $dev, USB bus $bus:"
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find_devs_in_tree "$bus" "$port"
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echo
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done
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echo "Enter 'q' to abort or anything else to repeat"
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read -r r
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if [ $? -ne 0 -o "$r" = "q" ]; then
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break;
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fi
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done
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exit 0
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