[PATCH v7 2/7] rust: helpers: Add bindings/wrappers for dma_resv_lock

Lyude Paul
2026-02-06T22:35:40Z

From: Asahi Lina <lina@asahilina.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@asahilina.net>
Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Janne Grunau <j@jananu.net>
Signed-off-by: Lyude Paul <lyude@redhat.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