linux-kernel - [WIP RFC v2 25/35] rust: drm/kms: Add RawPlaneState::crtc()

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Message-ID: <20240930233257.1189730-26-lyude@redhat.com>
Date: Mon, 30 Sep 2024 19:10:08 -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 25/35] rust: drm/kms: Add RawPlaneState::crtc()

Add a binding for checking drm_plane_state.crtc. Note that we don't have a
way of knowing what DriverCrtc implementation would be used here (and want
to make this function also available on OpaquePlaneState types), so we
return an OpaqueCrtc.

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

diff --git a/rust/kernel/drm/kms/plane.rs b/rust/kernel/drm/kms/plane.rs
index 04f1bdfbb1ea2..4d16d53179fca 100644
--- a/rust/kernel/drm/kms/plane.rs
+++ b/rust/kernel/drm/kms/plane.rs
@@ -30,6 +30,7 @@
     ModeObject,
     StaticModeObject,
     atomic::*,
+    crtc::*,
 };
 
 /// The main trait for implementing the [`struct drm_plane`] API for [`Plane`]
@@ -489,6 +490,12 @@ fn plane(&self) -> &Self::Plane {
         // invariant throughout the lifetime of the Plane
         unsafe { Self::Plane::from_raw(self.as_raw().plane) }
     }
+
+    /// Return the current [`OpaqueCrtc`] assigned to this plane, if there is one.
+    fn crtc<'a, 'b: 'a>(&'a self) -> Option<&'b OpaqueCrtc<<Self::Plane as ModeObject>::Driver>> {
+        // SAFETY: This cast is guaranteed safe by `OpaqueCrtc`s invariants.
+        NonNull::new(self.as_raw().crtc).map(|c| unsafe { OpaqueCrtc::from_raw(c.as_ptr()) })
+    }
 }
 impl<T: AsRawPlaneState + ?Sized> RawPlaneState for T {}
 
-- 
2.46.1