Hi,
Thank you all for your comments.

On 2021/06/22 17:12, Pekka Paalanen wrote:

On Tue, 22 Jun 2021 13:03:39 +0900
Esaki Tomohito [off-list ref] wrote:

quoted

Hi, Enrico Weigelt
Thank you for reply.

On 2021/06/22 1:05, Enrico Weigelt, metux IT consult wrote:

quoted

On 21.06.21 08:27, Tomohito Esaki wrote:

Hi,
  

quoted

Virtual DRM splits the overlay planes of a display controller into multiple
virtual devices to allow each plane to be accessed by each process.

This makes it possible to overlay images output from multiple processes on a
display. For example, one process displays the camera image without compositor
while another process overlays the UI.  

Are you attempting to create an simple in-kernel compositor ?  

I think the basic idea is the same as DRMlease.

Hi,

indeed. Why not use DRM leases instead?

In this use case, I understand that this is not possible with DRM lease,
am I wrong?
I understand that it’s not possible to lease a plane and update planes
on the same output independently from different processes in current DRM
lease.

If this is correct, what do you think of adding support for plane leases
to the DRM lease to handle this case?

Thanks,
Tomohito Esaki