linux-kernel - [PATCH v7 1/7] rust: drm: gem: Add raw_dma

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Message-ID: <20260206223431.693765-2-lyude@redhat.com>
Date: Fri,  6 Feb 2026 17:34:25 -0500
From: Lyude Paul <lyude@...hat.com>
To: linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Cc: nouveau@...ts.freedesktop.org,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Gary Guo <gary@...yguo.net>,
	Benno Lossin <lossin@...nel.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	Janne Grunau <j@...nau.net>
Subject: [PATCH v7 1/7] rust: drm: gem: Add raw_dma_resv() function

For retrieving a pointer to the struct dma_resv for a given GEM object. We
also introduce it in a new trait, BaseObjectPrivate, which we automatically
implement for all gem objects and don't expose to users outside of the
crate.

Signed-off-by: Lyude Paul <lyude@...hat.com>
Reviewed-by: Janne Grunau <j@...anu.net>
---
 rust/kernel/drm/gem/mod.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rust/kernel/drm/gem/mod.rs b/rust/kernel/drm/gem/mod.rs
index e1cc3af8ade9b..82b3151e5ae3b 100644
--- a/rust/kernel/drm/gem/mod.rs
+++ b/rust/kernel/drm/gem/mod.rs
@@ -197,6 +197,18 @@ fn create_mmap_offset(&self) -> Result<u64> {
 
 impl<T: IntoGEMObject> BaseObject for T {}
 
+/// Crate-private base operations shared by all GEM object classes.
+#[expect(unused)]
+pub(crate) trait BaseObjectPrivate: IntoGEMObject {
+    /// Return a pointer to this object's dma_resv.
+    fn raw_dma_resv(&self) -> *mut bindings::dma_resv {
+        // SAFETY: `as_gem_obj()` always returns a valid pointer to the base DRM gem object
+        unsafe { (*self.as_raw()).resv }
+    }
+}
+
+impl<T: IntoGEMObject> BaseObjectPrivate for T {}
+
 /// A base GEM object.
 ///
 /// # Invariants
-- 
2.53.0