[RFC PATCH v2 00/17] Host1x/TegraDRM UAPI

[Dmitry Osipenko]

05.09.2020 13:34, Mikko Perttunen пишет:
> Hi all,
> 
> here's a second revision of the Host1x/TegraDRM UAPI proposal,
> hopefully with most issues from v1 resolved, and also with
> an implementation. There are still open issues with the
> implementation:
> 
> * Relocs are now handled on TegraDRM side instead of Host1x,
>   so the firewall is not aware of them, causing submission
>   failure where the firewall is enabled. Proposed solution
>   is to move the firewall to TegraDRM side, but this hasn't
>   been done yet.
> * For the new UAPI, syncpoint recovery on job timeout is
>   disabled. What this means is that upon job timeout,
>   all further jobs using that syncpoint are cancelled,
>   and the syncpoint is marked unusable until it is freed.
>   However, there is currently a race between the timeout
>   handler and job submission, where submission can observe
>   the syncpoint in non-locked state and yet the job
>   cancellations won't cancel the new job.
> * Waiting for DMA reservation fences is not implemented yet.
> * I have only tested on Tegra186.
> 
> The series consists of three parts:
> 
> * The first part contains some fixes and improvements to
>   the Host1x driver of more general nature,
> * The second part adds the Host1x side UAPI, as well as
>   Host1x-side changes needed for the new TegraDRM UAPI,
> * The third part adds the new TegraDRM UAPI.
> 
> I have written some tests to test the new interface,
> see https://github.com/cyndis/uapi-test. Porting of proper
> userspace (e.g. opentegra, vdpau-tegra) will come once
> there is some degree of conclusion on the UAPI definition.

Could you please enumerate all the currently opened questions?