[RFC] Plane color pipeline KMS uAPI

[Jonas Ådahl]

On Tue, May 09, 2023 at 08:22:30PM +0000, Simon Ser wrote:
> On Tuesday, May 9th, 2023 at 21:53, Dave Airlie <airlied at gmail.com> wrote:
> 
> > There are also other vendor side effects to having this in userspace.
> > 
> > Will the library have a loader?
> > Will it allow proprietary plugins?
> > Will it allow proprietary reimplementations?
> > What will happen when a vendor wants distros to ship their
> > proprietary fork of said library?
> > 
> > How would NVIDIA integrate this with their proprietary stack?
> 
> Since all color operations exposed by KMS are standard, the library
> would just be a simple one: no loader, no plugin, no proprietary pieces,
> etc.
> 

There might be pipelines/color-ops only exposed by proprietary out of
tree drivers; the operation types and semantics should ideally be
defined upstream, but the code paths would in practice be vendor
specific, potentially without any upstream driver using them. It should
be clear whether an implementation that makes such a pipeline work is in
scope for the upstream library.

The same applies to the kernel; it must be clear whether pipeline
elements that potentially will only be exposed by out of tree drivers
will be acceptable upstream, at least as documented operations.


Jonas