linux-kernel - [WIP RFC v2 28/35] rust: drm/kms: Add RawPlane::framebuffer()

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Message-ID: <20240930233257.1189730-29-lyude@redhat.com>
Date: Mon, 30 Sep 2024 19:10:11 -0400
From: Lyude Paul <lyude@...hat.com>
To: dri-devel@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org
Cc: Asahi Lina <lina@...hilina.net>,
	Danilo Krummrich <dakr@...nel.org>,
	mcanal@...lia.com,
	airlied@...hat.com,
	zhiw@...dia.com,
	cjia@...dia.com,
	jhubbard@...dia.com,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	linux-kernel@...r.kernel.org (open list)
Subject: [WIP RFC v2 28/35] rust: drm/kms: Add RawPlane::framebuffer()

Returns the Framebuffer currently assigned in an atomic plane state.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 rust/kernel/drm/kms/plane.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/kernel/drm/kms/plane.rs b/rust/kernel/drm/kms/plane.rs
index cd5167e6441f1..15efa53fda8d3 100644
--- a/rust/kernel/drm/kms/plane.rs
+++ b/rust/kernel/drm/kms/plane.rs
@@ -31,6 +31,7 @@
     StaticModeObject,
     atomic::*,
     crtc::*,
+    framebuffer::*,
 };
 
 /// The main trait for implementing the [`struct drm_plane`] API for [`Plane`]
@@ -521,6 +522,13 @@ fn atomic_helper_check<S>(
             )
         })
     }
+
+    /// Return the framebuffer currently set for this plane state
+    #[inline]
+    fn framebuffer(&self) -> Option<&Framebuffer<<Self::Plane as ModeObject>::Driver>> {
+        // SAFETY: The layout of Framebuffer<T> is identical to `fb`
+        unsafe { self.as_raw().fb.as_ref().map(|fb| Framebuffer::from_raw(fb)) }
+    }
 }
 impl<T: AsRawPlaneState + ?Sized> RawPlaneState for T {}
 
-- 
2.46.1