rust: helpers: Add bindings/wrappers for dma_resv_lock

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>

Author: hoshinolina

rust/bindings/bindings_helper.h

@@ -51,6 +51,7 @@
 #include <linux/device/faux.h>
 #include <linux/dma-direction.h>
 #include <linux/dma-mapping.h>
+#include <linux/dma-resv.h>
 #include <linux/errname.h>
 #include <linux/ethtool.h>
 #include <linux/fdtable.h>

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);
+}

rust/helpers/helpers.c

@@ -26,6 +26,7 @@
 #include "device.c"
 #include "dma.c"
 #include "dma-mapping.c"
+#include "dma-resv.c"
 #include "drm.c"
 #include "err.c"
 #include "irq.c"