linux-kernel - Re: [PATCH] gpu: Move DRM buddy allocator one level up

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Message-ID: <CAPM=9twe3xcVBgrNCT+1_pGECPL-ry_aA2dxBwbKVeai4+S7AQ@mail.gmail.com>
Date: Tue, 25 Nov 2025 17:49:16 +1000
From: Dave Airlie <airlied@...il.com>
To: Christian König <christian.koenig@....com>
Cc: Joel Fernandes <joelagnelf@...dia.com>, linux-kernel@...r.kernel.org, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Simona Vetter <simona@...ll.ch>, Jonathan Corbet <corbet@....net>, 
	Alex Deucher <alexander.deucher@....com>, Jani Nikula <jani.nikula@...ux.intel.com>, 
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>, 
	Tvrtko Ursulin <tursulin@...ulin.net>, Huang Rui <ray.huang@....com>, 
	Matthew Auld <matthew.auld@...el.com>, Matthew Brost <matthew.brost@...el.com>, 
	Lucas De Marchi <lucas.demarchi@...el.com>, 
	Thomas Hellström <thomas.hellstrom@...ux.intel.com>, 
	Helge Deller <deller@....de>, Danilo Krummrich <dakr@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
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	Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
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	Alexandre Courbot <acourbot@...dia.com>, nouveau@...ts.freedesktop.org, 
	dri-devel@...ts.freedesktop.org, rust-for-linux@...r.kernel.org, 
	linux-doc@...r.kernel.org, amd-gfx@...ts.freedesktop.org, 
	intel-gfx@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org, 
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH] gpu: Move DRM buddy allocator one level up

On Tue, 25 Nov 2025 at 17:45, Christian König <christian.koenig@....com> wrote:
>
> On 11/25/25 00:44, Joel Fernandes wrote:
> > Move the DRM buddy allocator one level up so that it can be used by GPU
> > drivers (example, nova-core) that have usecases other than DRM (such as
> > VFIO vGPU support). Modify the API, structures and Kconfigs to use
> > "gpu_buddy" terminology. Adapt the drivers and tests to use the new API.
> >
> > The commit cannot be split due to bissectability, however no functional
> > change is intended. Verified by running K-UNIT tests and build tested
> > various configurations.
>
> Well such a change needs to be part of the patch set which actually starts to use it outside of drivers/gpu/drm.

I'm not sure it really makes sense yet to force that for this, since
the next patch would be just adding rust bindings to it, then a patch
to nova-core would be needed to use it, I'd rather not merge something
like this via the rust or nova trees as it breaks the principle of
least surprise.

Maybe this + rust bindings might be enough to justify it, but it
should be reviewable as a standalone idea.

Dave.