configs: Exit GPUFS script if DKMS module does not exist

The supported version of ROCm in GPUFS only supports the DKMS build of
the amdgpu driver. However, since a gem5 user can potentially pass in
any Linux kernel as a parameter, it is possible that the DKMS package
for that kernel was not installed on the disk image. This would result
in the simulation appearing to work when in reality it is just spinning
waiting for commands from the driver. This check exits gem5 early in the
simulation and outputs an error on the console to sanity check the
correct driver is being used.

Change-Id: I708912e5625e47eba15dcb2f722772a3b2928b98
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58129
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

configs/example/gpufs/vega10_kvm.py

@@ -49,6 +49,10 @@ export LD_LIBRARY_PATH=/opt/rocm/lib:$LD_LIBRARY_PATH
 export HSA_ENABLE_SDMA=0
 dmesg -n8
 dd if=/root/roms/vega10.rom of=/dev/mem bs=1k seek=768 count=128
+if [ ! -f /lib/modules/`uname -r`/updates/dkms/amdgpu.ko ]; then
+    echo "ERROR: Missing DKMS package for kernel `uname -r`. Exiting gem5."
+    /sbin/m5 exit
+fi
 modprobe -v amdgpu ip_block_mask=0xff ppfeaturemask=0 dpm=0 audio=0
 echo "Running {} {}"
 echo "{}" | base64 -d > myapp