linux-kernel - [PATCH v5 3/4] rust/drm/gem: Add DriverAllocImpl type alias

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Message-ID: <20260131001602.2095470-4-lyude@redhat.com>
Date: Fri, 30 Jan 2026 19:13:32 -0500
From: Lyude Paul <lyude@...hat.com>
To: linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Cc: nouveau@...ts.freedesktop.org,
	"Miguel Ojeda" <ojeda@...nel.org>,
	"Simona Vetter" <simona@...ll.ch>,
	"Alice Ryhl" <aliceryhl@...gle.com>,
	"Shankari Anand" <shankari.ak0208@...il.com>,
	"David Airlie" <airlied@...il.com>,
	"Benno Lossin" <lossin@...nel.org>,
	"Asahi Lina" <lina+kernel@...hilina.net>,
	"Daniel Almeida" <daniel.almeida@...labora.com>,
	"Lyude Paul" <lyude@...hat.com>
Subject: [PATCH v5 3/4] rust/drm/gem: Add DriverAllocImpl type alias

This is just a type alias that resolves into the AllocImpl for a given
  T: drm::gem::DriverObject

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 rust/kernel/drm/gem/mod.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/rust/kernel/drm/gem/mod.rs b/rust/kernel/drm/gem/mod.rs
index b4199945db378..ad74c5159f725 100644
--- a/rust/kernel/drm/gem/mod.rs
+++ b/rust/kernel/drm/gem/mod.rs
@@ -33,6 +33,11 @@
 /// [`DriverFile`]: drm::file::DriverFile
 pub type DriverFile<T> = drm::File<<<T as DriverObject>::Driver as drm::Driver>::File>;
 
+/// A type alias for retrieving the current [`AllocImpl`] for a given [`DriverObject`].
+///
+/// [`Driver`]: drm::Driver
+pub type DriverAllocImpl<T> = <<T as DriverObject>::Driver as drm::Driver>::Object;
+
 /// GEM object functions, which must be implemented by drivers.
 pub trait DriverObject: Sync + Send + Sized {
     /// Parent `Driver` for this object.
@@ -42,12 +47,12 @@ pub trait DriverObject: Sync + Send + Sized {
     fn new(dev: &drm::Device<Self::Driver>, size: usize) -> 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 {
+    fn open(_obj: &DriverAllocImpl<Self>, _file: &DriverFile<Self>) -> Result {
         Ok(())
     }
 
     /// Close a handle to an existing object, associated with a File.
-    fn close(_obj: &<Self::Driver as drm::Driver>::Object, _file: &DriverFile<Self>) {}
+    fn close(_obj: &DriverAllocImpl<Self>, _file: &DriverFile<Self>) {}
 }
 
 /// Trait that represents a GEM object subtype
-- 
2.52.0