[PATCH 1/2] rust: helpers: Add bindings/wrappers for dma_resv

Daniel Almeida
2025-03-24T15:14:55Z

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>
---
rust/bindings/bindings_helper.h | 4 +++-
rust/helpers/dma-resv.c | 13 +++++++++++++
rust/helpers/helpers.c | 1 +
3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
index e6020ba5b00237a08402fbd609c7fba27b970dd9..53111b5b35588541eca05e574a8d24cdafbf1dd6 100644
--- a/rust/bindings/bindings_helper.h
+++ b/rust/bindings/bindings_helper.h
@@ -18,6 +18,7 @@
#include <linux/blkdev.h>
#include <linux/cred.h>
#include <linux/device/faux.h>
+#include <linux/dma-resv.h>
#include <linux/errname.h>
#include <linux/ethtool.h>
#include <linux/file.h>
@@ -53,5 +54,6 @@ const gfp_t RUST_CONST_HELPER_GFP_NOWAIT = GFP_NOWAIT;
const gfp_t RUST_CONST_HELPER___GFP_ZERO = __GFP_ZERO;
const gfp_t RUST_CONST_HELPER___GFP_HIGHMEM = ___GFP_HIGHMEM;
const gfp_t RUST_CONST_HELPER___GFP_NOWARN = ___GFP_NOWARN;
-const blk_features_t RUST_CONST_HELPER_BLK_FEAT_ROTATIONAL = BLK_FEAT_ROTATIONAL;
+const blk_features_t RUST_CONST_HELPER_BLK_FEAT_ROTATIONAL =
+ BLK_FEAT_ROTATIONAL;
const fop_flags_t RUST_CONST_HELPER_FOP_UNSIGNED_OFFSET = FOP_UNSIGNED_OFFSET;
diff --git a/rust/helpers/dma-resv.c b/rust/helpers/dma-resv.c
new file mode 100644
index 0000000000000000000000000000000000000000..05501cb814513b483afd0b7f220230d867863c2f
--- /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 7a06d6bc48537248c8a3ec4243b37d8fb2b1cb26..c5e536d688bc35c7b348daa61e868c91a7bdbd23 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -14,6 +14,7 @@
#include "build_bug.c"
#include "cred.c"
#include "device.c"
+#include "dma-resv.c"
#include "drm.c"
#include "err.c"
#include "fs.c"

--
2.48.1