On 9/9/20 5:20 AM, Dmitry Osipenko wrote:
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?
Which open questions do you refer to? The open items of v1 should be
closed now; for fences we setup an SW timeout to prevent them from
sticking around forever, and regarding GEM the GEM IOCTLs are again
being used.
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