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Date: Tue, 29 Sep 2026 20:40:25 +0200
Message-Id: <DLS0QEPJKOPZ.1MX607W2OQ0RI@kernel.org>
Subject: Re: [PATCH v3 09/11] rust: device: expose dma_coherent()
Cc: <sunke@kylinos.cn>, "Miguel Ojeda" <ojeda@kernel.org>, "Boqun Feng"
 <boqun@kernel.org>, "Gary Guo" <gary@garyguo.net>,
 =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>, "Benno Lossin"
 <lossin@kernel.org>, "Andreas Hindborg" <a.hindborg@kernel.org>, "Alice
 Ryhl" <aliceryhl@google.com>, "Trevor Gross" <tmgross@umich.edu>, "Daniel
 Almeida" <daniel.almeida@collabora.com>, "Tamir Duberstein"
 <tamird@kernel.org>, "Alexandre Courbot" <acourbot@nvidia.com>,
 =?utf-8?q?Onur_=C3=96zkan?= <work@onurozkan.dev>, "Lorenzo Stoakes"
 <ljs@kernel.org>, "Liam R. Howlett" <liam@infradead.org>, "Lyude Paul"
 <lyude@redhat.com>, "David Airlie" <airlied@gmail.com>, "Simona Vetter"
 <simona@ffwll.ch>, "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
 "Rafael J. Wysocki" <rafael@kernel.org>, "Sami Tolvanen"
 <samitolvanen@google.com>, <rust-for-linux@vger.kernel.org>,
 <linux-mm@kvack.org>, <dri-devel@lists.freedesktop.org>,
 <driver-core@lists.linux.dev>, "Alvin Sun" <alvin.sun@linux.dev>
To: "Ke Sun via B4 Relay" <devnull+sunke.kylinos.cn@kernel.org>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260929-tyr-ioctls-v3-0-26955fb111d5@kylinos.cn>
 <20260929-tyr-ioctls-v3-9-26955fb111d5@kylinos.cn>
In-Reply-To: <20260929-tyr-ioctls-v3-9-26955fb111d5@kylinos.cn>

On Tue Sep 29, 2026 at 4:15 AM CEST, Ke Sun via B4 Relay wrote:
> Add a thin accessor on Device<Bound> that wraps device_get_dma_attr()
> and returns true only for DEV_DMA_COHERENT. The other attribute values
> (unset, non-coherent) are treated as non-coherent.

Why not return a transparent wrapper around enum dev_dma_attr so we have al=
l
cases covered?