On Tue, Oct 22, 2024 at 1:38 AM Maxime Ripard mripard@redhat.com wrote:
I wanted to follow-up on the discussion we had at Plumbers with John and T.J. about (among other things) adding new heaps to the kernel.
I'm still interested in merging a carve-out driver[1], since it seems to be in every vendor BSP and got asked again last week.
I remember from our discussion that for new heap types to be merged, we needed a kernel use-case. Looking back, I'm not entirely sure how one can provide that given that heaps are essentially facilities for user-space.
Am I misremembering or missing something? What are the requirements for you to consider adding a new heap driver?
It's basically the same as the DRM subsystem rules. https://docs.kernel.org/gpu/drm-uapi.html#open-source-userspace-requirements ie: There has to be opensource user for it, and the user has to be more significant than a "toy" implementation (which can be a bit subjective and contentious when trying to get out of a chicken and egg loop).
thanks -john