linux-kernel - [PATCH v7 2/7] rust: helpers: Add bindings/wrappers for dma_resv

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Message-ID: <20260206223431.693765-3-lyude@redhat.com>
Date: Fri,  6 Feb 2026 17:34:26 -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 2/7] rust: helpers: Add bindings/wrappers for dma_resv_lock

From: Asahi Lina <lina@...hilina.net>

This is just for basic usage in the DRM shmem abstractions for implied
locking, not intended as a full DMA Reservation abstraction yet.

Signed-off-by: Asahi Lina <lina@...hilina.net>
Signed-off-by: Daniel Almeida <daniel.almeida@...labora.com>
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Reviewed-by: Janne Grunau <j@...anu.net>
Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 rust/bindings/bindings_helper.h |  1 +
 rust/helpers/dma-resv.c         | 13 +++++++++++++
 rust/helpers/helpers.c          |  1 +
 3 files changed, 15 insertions(+)
 create mode 100644 rust/helpers/dma-resv.c

diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
index 9fdf76ca630e0..ecf31681df806 100644
--- a/rust/bindings/bindings_helper.h
+++ b/rust/bindings/bindings_helper.h
@@ -48,6 +48,7 @@
 #include <linux/cpumask.h>
 #include <linux/cred.h>
 #include <linux/debugfs.h>
+#include <linux/dma-resv.h>
 #include <linux/device/faux.h>
 #include <linux/dma-direction.h>
 #include <linux/dma-mapping.h>
diff --git a/rust/helpers/dma-resv.c b/rust/helpers/dma-resv.c
new file mode 100644
index 0000000000000..05501cb814513
--- /dev/null
+++ b/rust/helpers/dma-resv.c
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/dma-resv.h>
+
+int rust_helper_dma_resv_lock(struct dma_resv *obj, struct ww_acquire_ctx *ctx)
+{
+	return dma_resv_lock(obj, ctx);
+}
+
+void rust_helper_dma_resv_unlock(struct dma_resv *obj)
+{
+	dma_resv_unlock(obj);
+}
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index 79c72762ad9c4..1d3333cc0d2a8 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -25,6 +25,7 @@
 #include "cred.c"
 #include "device.c"
 #include "dma.c"
+#include "dma-resv.c"
 #include "drm.c"
 #include "err.c"
 #include "irq.c"
-- 
2.53.0