linux-kernel - [PATCH 1/2] rust: helpers: Add bindings/wrappers for dma

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Message-Id: <20250324-gpuvm-v1-1-7f8213eebb56@collabora.com>
Date: Mon, 24 Mar 2025 12:13:54 -0300
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <benno.lossin@...ton.me>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Sumit Semwal <sumit.semwal@...aro.org>, 
 Christian König <christian.koenig@....com>, 
 Boris Brezillon <boris.brezillon@...labora.com>
Cc: linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, Asahi Lina <lina@...hilina.net>
Subject: [PATCH 1/2] rust: helpers: Add bindings/wrappers for dma_resv

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>
---
 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