Script to reset a PCI device

pci-reset.sh

#!/bin/bash

dev=$1

if [[ -z $dev ]]; then
    echo "Error: no device specified"
    exit 1
fi

if [[ ! -e /sys/bus/pci/devices/$dev ]]; then
    dev="0000:$dev"
fi

if [[ ! -e /sys/bus/pci/devices/$dev ]]; then
    echo "Error: device $dev not found"
    exit 1
fi

port=$(basename $(dirname $(readlink /sys/bus/pci/devices/$dev)))

if [ ! -e /sys/bus/pci/devices/$port ]; then
    echo "Error: device $port not found"
    exit 1
fi

echo "Reseting $dev..."
echo 1 > /sys/bus/pci/devices/$dev/reset
sleep 1

echo "Removing $dev..."

echo 1 > /sys/bus/pci/devices/$dev/remove

echo "Performing hot reset of port $port..."

bc=$(setpci -s $port BRIDGE_CONTROL)

echo "Bridge control:" $bc

setpci -s $port BRIDGE_CONTROL=$(printf "%04x" $(("0x$bc" | 0x40)))
sleep 0.01
setpci -s $port BRIDGE_CONTROL=$bc
sleep 0.5

echo "Rescanning bus..."

echo 1 > /sys/bus/pci/devices/$port/rescan