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en:pcie:hot-reset-linux [2019/04/16 22:59] alex created |
en:pcie:hot-reset-linux [2019/04/16 23:00] alex |
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| I am not aware of any 'nice' method for triggering a hot reset (there is no sysfs entry for that). However, it is possible to use setpci to do so with the following script: | I am not aware of any 'nice' method for triggering a hot reset (there is no sysfs entry for that). However, it is possible to use setpci to do so with the following script: | ||
| - | <code sh> | ||
| - | #!/bin/bash | ||
| - | dev=$1 | ||
| - | if [ -z "$dev" ]; then | + | <code sh> |
| - | 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> | </code> | ||