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--- en:pcie:hot-reset-linux [2019/04/16 23:00]
alex
+++ en:pcie:hot-reset-linux [2019/04/16 23:00]
alex
@@ Line 17: / Line 17: @@
-<code sh>
+<code>
+#!/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 "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"
 </code>