linux-kernel - Re: [RFC PATCH 2/4] rust: sync: Add dma

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Message-ID: <eca9693146dd9db88a6ea0b8b435d2ef0246ee2e.camel@mailbox.org>
Date: Mon, 09 Feb 2026 09:21:51 +0100
From: Philipp Stanner <phasta@...lbox.org>
To: Boris Brezillon <boris.brezillon@...labora.com>
Cc: phasta@...nel.org, Gary Guo <gary@...yguo.net>, David Airlie
 <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Danilo Krummrich
 <dakr@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, Benno Lossin
 <lossin@...nel.org>, Christian König
 <christian.koenig@....com>, Daniel Almeida <daniel.almeida@...labora.com>, 
 Joel Fernandes <joelagnelf@...dia.com>, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org,  rust-for-linux@...r.kernel.org
Subject: Re: [RFC PATCH 2/4] rust: sync: Add dma_fence abstractions

On Fri, 2026-02-06 at 12:04 +0100, Boris Brezillon wrote:
> On Fri, 06 Feb 2026 10:32:38 +0100
> Philipp Stanner <phasta@...lbox.org> wrote:
> 

[…]

> > 
> > So I strongly think that we'd either want to drop data: T, or we should
> > think about possibilities to hide it from other drivers.
> > 
> > I've got currently no idea how that could be addressed in Rust, though 
> 
> So, as Danilo explained in his reply, there's two kind of users:
> 
> 1. those that want to wait on fences (that'd be the JobQueue, for
>    instance)
> 2. those that are emitting fences (AKA those implementing the fence_ops
>    in C)
> 
> And each of them should be given different access to the underlying
> dma_fence, hence the proposal to have different objects to back
> those concepts.


That makes sense and can be implemented. I can pick it up.

P.