linux-kernel - [WIP RFC v2 26/35] WIP: rust: drm/kms: Add RawPlaneState::atomic_helper

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Message-ID: <20240930233257.1189730-27-lyude@redhat.com>
Date: Mon, 30 Sep 2024 19:10:09 -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 26/35] WIP: rust: drm/kms: Add RawPlaneState::atomic_helper_check()

Add a binding for drm_atomic_helper_check_plane_state(). Since we want to
make sure that the user is passing in the new state for a Crtc instead of
an old state, we explicitly ask for a reference to a BorrowedCrtcState.

Signed-off-by: Lyude Paul <lyude@...hat.com>

---

TODO:
* Add support for scaling options

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 rust/kernel/drm/kms/plane.rs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/rust/kernel/drm/kms/plane.rs b/rust/kernel/drm/kms/plane.rs
index 4d16d53179fca..cd5167e6441f1 100644
--- a/rust/kernel/drm/kms/plane.rs
+++ b/rust/kernel/drm/kms/plane.rs
@@ -496,6 +496,31 @@ fn crtc<'a, 'b: 'a>(&'a self) -> Option<&'b OpaqueCrtc<<Self::Plane as ModeObjec
         // 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()) })
     }
+
+    /// Run the atomic check helper for this plane and the given CRTC state
+    fn atomic_helper_check<S>(
+        &mut self,
+        crtc_state: &BorrowedCrtcState<'_, S>,
+        can_position: bool,
+        can_update_disabled: bool
+    ) -> Result
+    where
+        S: FromRawCrtcState,
+        S::Crtc: AsRawCrtc<Driver = <Self::Plane as ModeObject>::Driver>
+    {
+        // SAFETY: We're passing the mutable reference from `self.as_raw_mut()` directly to DRM,
+        // which is safe.
+        to_result(unsafe {
+            bindings::drm_atomic_helper_check_plane_state(
+                self.as_raw_mut(),
+                crtc_state.as_raw(),
+                bindings::DRM_PLANE_NO_SCALING as _, // TODO: add parameters for scaling
+                bindings::DRM_PLANE_NO_SCALING as _,
+                can_position,
+                can_update_disabled
+            )
+        })
+    }
 }
 impl<T: AsRawPlaneState + ?Sized> RawPlaneState for T {}
 
-- 
2.46.1