How to gracefully handle pci remove

[Andrey Grodzovsky]

Just another ping...

Daniel, Dave - maybe you could give some advise on that ?

P.S I tried with Intel card (i915) driver on 4.18.1 kernel to do the 
same to get some reference point, but it just hanged.

Andrey



On 08/27/2018 12:04 PM, Andrey Grodzovsky wrote:
> Hi everybody , I am trying to resolve various problems I observe when 
> logically removing AMDGPU device from pci - echo 1 > 
> /sys/class/drm/card0/device/remove
>
> One of the problems I encountered was hitting WARNs  in 
> amdgpu_gem_force_release. It complaints  about still open client FDs 
> and BOs allocations which is obvious since
>
> we didn't let user space clients know about the device removal and 
> hence they won't release allocations and won't close their FDs.
>
> Question - how other drivers handle this use case, especially eGPUs 
> since they indeed may be extracted in any moment, is there any way to 
> notify Xorg and other clients about this so they may
>
> have a chance to release all their allocations and probably terminate 
> ? Maybe some kind of uevent ?
>
> Andrey
>