Same thing as OpaquePlane, but for encoders now.
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
---
TODO:
* Add upcast functions for this
Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
---
rust/kernel/drm/kms/encoder.rs | 55 ++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/rust/kernel/drm/kms/encoder.rs b/rust/kernel/drm/kms/encoder.rs
index 3ae597093645e..71fae45d2d651 100644
--- a/rust/kernel/drm/kms/encoder.rs
+++ b/rust/kernel/drm/kms/encoder.rs
@@ -235,6 +235,61 @@ pub fn new<'a, 'b: 'a>(
}
}
+/// A [`struct drm_encoder`] without a known [`DriverEncoder`] implementation.
+///
+/// This is mainly for situations where our bindings can't infer the [`DriverEncoder`] implementation
+/// for a [`struct drm_encoder`] automatically. It is identical to [`Encoder`], except that it does not
+/// provide access to the driver's private data.
+///
+/// TODO: Add functions for upcasting.
+///
+/// # Invariants
+///
+/// Same as [`Encoder`].
+#[repr(transparent)]
+pub struct OpaqueEncoder<T: KmsDriver> {
+ encoder: Opaque<bindings::drm_encoder>,
+ _p: PhantomData<T>,
+}
+
+impl<T: KmsDriver> Sealed for OpaqueEncoder<T> {}
+
+// SAFETY: All of our encoder interfaces are thread-safe
+unsafe impl<T: KmsDriver> Send for OpaqueEncoder<T> {}
+
+// SAFETY: All of our encoder interfaces are thread-safe
+unsafe impl<T: KmsDriver> Sync for OpaqueEncoder<T> {}
+
+impl<T: KmsDriver> ModeObject for OpaqueEncoder<T> {
+ type Driver = T;
+
+ fn drm_dev(&self) -> &Device<Self::Driver> {
+ // SAFETY: DRM encoders exist for as long as the device does, so this pointer is always
+ // valid
+ unsafe { Device::borrow((*self.encoder.get()).dev) }
+ }
+
+ fn raw_mode_obj(&self) -> *mut bindings::drm_mode_object {
+ // SAFETY: We don't expose Encoder<T> to users before it's initialized, so `base` is always
+ // initialized
+ unsafe { addr_of_mut!((*self.encoder.get()).base) }
+ }
+}
+
+// SAFETY: Encoders do not have a refcount
+unsafe impl<T: KmsDriver> StaticModeObject for OpaqueEncoder<T> {}
+
+impl<T: KmsDriver> AsRawEncoder for OpaqueEncoder<T> {
+ fn as_raw(&self) -> *mut bindings::drm_encoder {
+ self.encoder.get()
+ }
+
+ unsafe fn from_raw<'a>(ptr: *mut bindings::drm_encoder) -> &'a Self {
+ // SAFETY: Our data layout is identical to `bindings::drm_encoder`
+ unsafe { &*ptr.cast() }
+ }
+}
+
unsafe extern "C" fn encoder_destroy_callback<T: DriverEncoder>(
encoder: *mut bindings::drm_encoder
) {
--
2.46.1
