linux-kernel - [PATCH v2 1/2] rust: helpers: Add bindings/wrappers for dma

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Message-Id: <20250422-gpuvm-v2-1-44d4fc25e411@collabora.com>
Date: Tue, 22 Apr 2025 13:41:52 -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>, 
 Danilo Krummrich <dakr@...nel.org>, 
 Alyssa Rosenzweig <alyssa@...enzweig.io>, Lyude Paul <lyude@...hat.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
 dri-devel@...ts.freedesktop.org, Asahi Lina <lina@...hilina.net>
Subject: [PATCH v2 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 |  1 +
 rust/helpers/dma-resv.c         | 13 +++++++++++++
 rust/helpers/helpers.c          |  1 +
 3 files changed, 15 insertions(+)

diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
index e6020ba5b00237a08402fbd609c7fba27b970dd9..68d7be498a6d523797e54212d6c23ff4d8f2e92d 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>
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"

-- 
2.49.0