On Tue, Dec 02, 2025 at 05:03:28PM -0500, Lyude Paul wrote:

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 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 2e43c66635a2c..07f79e125c329 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>

nit: alphabetical order

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 551da6c9b5064..36d40f911345c 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"

with that fixed

Reviewed-by: Janne Grunau j@jananu.net

Janne