[Bug 111229] Unable to unbind GPU from amdgpu

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111229

            Bug ID: 111229
           Summary: Unable to unbind GPU from amdgpu
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: wedens13 at yandex.ru

Created attachment 144877
  --> https://bugs.freedesktop.org/attachment.cgi?id=144877&action=edit
dmesg kernel 5.2.1

Arch linux
Kernel version: 5.2.1

I have two GPUs in my system: integrated Intel and Sapphire Pulse Vega 56.
I boot with Intel as my primary gpu and I use Vega for VFIO (gpu passthrough)
and gpu offloading.
What I'm trying to do is to boot with amdgpu driver for Vega and bind it to
vfio-pci when I start VM (qemu).

The problem occurs when I try to unbind Vega from amdgpu driver using this
command:
echo -n "0000:03:00.0" > /sys/bus/pci/drivers/amdgpu/unbind

It results in segfault with following error in dmesg (full dmesg from boot to
shutdown is attached):
[drm:amdgpu_pci_remove [amdgpu]] *ERROR* Device removal is currently not
supported outside of fbcon

After that I'm unable to rebind device back to amdgpu or any other driver:
echo "0000:03:00.0" > /sys/bus/pci/drivers/amdgpu/bind
bash: echo: write error: No such device

Also I'm unable to shutdown properly. Shutdown process becomes stuck at some
point and only holding the button helps.

I've attached relevant lspci -vvv output before and after attempt to unbind, in
case it's useful.

Another thing I've tried is to unbind using kernel 4.19.60 and it just hangs
after executing the command. I've attached the log of this attempt (error is
different from 5.2.1).

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