linux-kernel - Re: [PATCH v5 4/8] rust: gem: Introduce DriverObject::Args

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Message-ID: <aQpk98pvsZUdk3xa@um790>
Date: Tue, 4 Nov 2025 12:41:27 -0800
From: Deborah Brouwer <deborah.brouwer@...labora.com>
To: Lyude Paul <lyude@...hat.com>
Cc: dri-devel@...ts.freedesktop.org, rust-for-linux@...r.kernel.org,
	Alice Ryhl <aliceryhl@...gle.com>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Danilo Krummrich <dakr@...nel.org>, linux-kernel@...r.kernel.org,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>,
	Asahi Lina <lina+kernel@...hilina.net>,
	Shankari Anand <shankari.ak0208@...il.com>,
	"open list:DRM DRIVER FOR NVIDIA GPUS [RUST]" <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH v5 4/8] rust: gem: Introduce DriverObject::Args

On Thu, Oct 23, 2025 at 05:22:06PM -0400, Lyude Paul wrote:
> This is an associated type that may be used in order to specify a data-type
> to pass to gem objects when construction them, allowing for drivers to more
> easily initialize their private-data for gem objects.
> 
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
> 
> ---
> V3:
> * s/BaseDriverObject/DriverObject/
> V4:
> * Fix leftover reference to BaseObjectDriver in rustdoc for
>   DriverObject::Args
> 
>  drivers/gpu/drm/nova/gem.rs |  5 +++--
>  rust/kernel/drm/gem/mod.rs  | 13 ++++++++++---
>  2 files changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nova/gem.rs b/drivers/gpu/drm/nova/gem.rs
> index 2760ba4f3450b..173077eeb2def 100644
> --- a/drivers/gpu/drm/nova/gem.rs
> +++ b/drivers/gpu/drm/nova/gem.rs
> @@ -18,8 +18,9 @@ pub(crate) struct NovaObject {}
>  
>  impl gem::DriverObject for NovaObject {
>      type Driver = NovaDriver;
> +    type Args = ();
>  
> -    fn new(_dev: &NovaDevice, _size: usize) -> impl PinInit<Self, Error> {
> +    fn new(_dev: &NovaDevice, _size: usize, _args: Self::Args) -> impl PinInit<Self, Error> {
>          try_pin_init!(NovaObject {})
>      }
>  }

Hi Lyude - could you please add the same changes for Tyr so it will
compile too

> @@ -33,7 +34,7 @@ pub(crate) fn new(dev: &NovaDevice, size: usize) -> Result<ARef<gem::Object<Self
>              return Err(EINVAL);
>          }
>  
> -        gem::Object::new(dev, aligned_size)
> +        gem::Object::new(dev, aligned_size, ())
>      }
>  
>      /// Look up a GEM object handle for a `File` and return an `ObjectRef` for it.
> diff --git a/rust/kernel/drm/gem/mod.rs b/rust/kernel/drm/gem/mod.rs
> index 67813cfb0db42..d448c65fe5e13 100644
> --- a/rust/kernel/drm/gem/mod.rs
> +++ b/rust/kernel/drm/gem/mod.rs
> @@ -65,8 +65,15 @@ pub trait DriverObject: Sync + Send + Sized {
>      /// Parent `Driver` for this object.
>      type Driver: drm::Driver;
>  
> +    /// The data type to use for passing arguments to [`DriverObject::new`].
> +    type Args;
> +
>      /// Create a new driver data object for a GEM object of a given size.
> -    fn new(dev: &drm::Device<Self::Driver>, size: usize) -> impl PinInit<Self, Error>;
> +    fn new(
> +        dev: &drm::Device<Self::Driver>,
> +        size: usize,
> +        args: Self::Args,
> +    ) -> impl PinInit<Self, Error>;
>  
>      /// Open a new handle to an existing object, associated with a File.
>      fn open(_obj: &<Self::Driver as drm::Driver>::Object, _file: &DriverFile<Self>) -> Result {
> @@ -247,11 +254,11 @@ impl<T: DriverObject> Object<T> {
>      };
>  
>      /// Create a new GEM object.
> -    pub fn new(dev: &drm::Device<T::Driver>, size: usize) -> Result<ARef<Self>> {
> +    pub fn new(dev: &drm::Device<T::Driver>, size: usize, args: T::Args) -> Result<ARef<Self>> {
>          let obj: Pin<KBox<Self>> = KBox::pin_init(
>              try_pin_init!(Self {
>                  obj: Opaque::new(bindings::drm_gem_object::default()),
> -                data <- T::new(dev, size),
> +                data <- T::new(dev, size, args),
>                  // INVARIANT: The drm subsystem guarantees that the `struct drm_device` will live
>                  // as long as the GEM object lives.
>                  dev: dev.into(),
> -- 
> 2.51.0
>