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en:pcie:hot-reset-linux [2019/04/16 23:00] alex |
en:pcie:hot-reset-linux [2019/04/16 23:01] 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> | <code sh> | ||
| Line 27: | Line 25: | ||
| exit 1 | exit 1 | ||
| fi | 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> | ||