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MonopolyMan

Member

Registered: 2015-07-05

Posts: 6

System freezes when trying to unbind GPU from Radeon

Right now I'm trying to accomplish this: http://arseniyshestakov.com/2016/03/31/ … x-restart/

I've gotten everything on the host to work. DRI_PRIME is working correctly as shown below:

$ DRI_PRIME=1 glxinfo | grep "renderer string"
OpenGL renderer string: Gallium 0.4 on AMD HAWAII (DRM 2.43.0, LLVM 3.7.1)

$ glxinfo | grep "renderer string"
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Server

The problem is that the system completely freezes up when I'm trying to move the GPU from radeon to vfio-pci using this script:

#!/bin/bash
set -x
echo "1002 67b1" > /sys/bus/pci/drivers/vfio-pci/new_id
echo "0000:01:00.0" > /sys/bus/pci/devices/0000:01:00.0/driver/unbind
echo "0000:01:00.0" > /sys/bus/pci/drivers/vfio-pci/bind
echo "1002 67b1" > /sys/bus/pci/drivers/vfio-pci/remove_id

echo "1002 aac8" > /sys/bus/pci/drivers/vfio-pci/new_id
echo "0000:01:00.1" > /sys/bus/pci/devices/0000:01:00.1/driver/unbind
echo "0000:01:00.1" > /sys/bus/pci/drivers/vfio-pci/bind
echo "1002 aac8" > /sys/bus/pci/drivers/vfio-pci/remove_id

set +x

It freezes on the line: echo "0000:01:00.0" > /sys/bus/pci/devices/0000:01:00.0/driver/unbind and the only thing I can do is power off the system via the power button.

I checked journalctl and I noticed this kept happening after the system froze:

Apr 02 11:13:12 joey-arch-pc kernel: WARNING: CPU: 1 PID: 7293 at drivers/gpu/drm/radeon/radeon_gart.c:246 radeon_gart_unbind+0xca/0xe0 [radeon]()
Apr 02 11:13:12 joey-arch-pc kernel: trying to unbind memory from uninitialized GART !

Here is the rest of the messages from journalctl with call traces: http://pastebin.com/L0asXS16

I found a good amount of similar bug reports via google, but they were rather old. There was a wide range of different patches I found related to similar issues, but since I am inexperienced with this sort of stuff I wasn't exactly sure which would be the best patch to use. I attempted this patch: https://bugzilla.kernel.org/attachment. … ction=diff but it didn't work. I could try a bunch of different patches, but I thought it would be more logical to post here and see if someone has a solution before I waste time blindly trying a bunch of patches.