[Bug 101946] Rebinding AMDGPU causes initialization errors [R9 290 / 4.10 kernel]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101946

--- Comment #14 from Robin <beanow at oscp.info> ---
Created attachment 133108
  --> https://bugs.freedesktop.org/attachment.cgi?id=133108&action=edit
case3.sh

So, tinkering with the test script I've only been able to eliminate some
suspicions and invalidate my observation the patch performed better.

I've taken out vfio-pci binding from the loop. It's only used during boot to
keep the GPU free to unbind. So it's not related to vfio-pci's having access in
between binds.

I've made 3 methods for rebinding amdgpu.
amdgpu rmmod > modprobe
remove pci devices > rescan
driver unbind > bind

I've run each of these a few dozen times on each kernel and none of them really
stand out. All of them have a chance to work (as in, ring 1 test failure only)
or to fail.

4.13rc2, drm-next-4.14-wip, drm-next-4.14-wip + patch3 all have this behaviour.
So no I don't think they've helped after all.

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