Nouveau - May 2025 - [PATCH v2 05/12] rust: gem: Introduce BaseDriverObject::Args

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 at redhat.com>
---
 drivers/gpu/drm/nova/gem.rs |  5 +++--
 rust/kernel/drm/gem/mod.rs  | 17 ++++++++++++++---
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/nova/gem.rs b/drivers/gpu/drm/nova/gem.rs
index a3024922f0d90..f2f23320110dd 100644
--- a/drivers/gpu/drm/nova/gem.rs
+++ b/drivers/gpu/drm/nova/gem.rs
@@ -19,8 +19,9 @@ pub(crate) struct NovaObject {}
 impl gem::BaseDriverObject for NovaObject {
     type Driver = NovaDriver;
     type Object = gem::Object<Self>;
+    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 {})
     }
 }
@@ -34,7 +35,7 @@ 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 1165417b22df6..f0029e6989ed6 100644
--- a/rust/kernel/drm/gem/mod.rs
+++ b/rust/kernel/drm/gem/mod.rs
@@ -29,8 +29,15 @@ pub trait BaseDriverObject: Sync + Send + Sized {
     /// The GEM object type that will be passed to various callbacks.
     type Object: AllocImpl;
 
+    /// The data type to use for passing arguments to
[`BaseDriverObject::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::Object, _file: &DriverFile<Self>) ->
Result {
@@ -232,11 +239,15 @@ impl<T: BaseDriverObject> 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(),
-- 
2.49.0