linux-kernel - Re: [PATCH v3 2/6] rust: helpers: Add bindings/wrappers for dma_resv

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Message-Id: <34582CF9-6EBB-4205-B05C-D30E9C3EDD25@collabora.com>
Date: Wed, 21 Jan 2026 09:39:08 -0300
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Danilo Krummrich <dakr@...nel.org>,
 Boris Brezillon <boris.brezillon@...labora.com>,
 Janne Grunau <j@...nau.net>,
 Matthew Brost <matthew.brost@...el.com>,
 Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
 Lyude Paul <lyude@...hat.com>,
 Asahi Lina <lina+kernel@...hilina.net>,
 dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v3 2/6] rust: helpers: Add bindings/wrappers for
 dma_resv_lock



> On 21 Jan 2026, at 08:31, Alice Ryhl <aliceryhl@...gle.com> wrote:
> 
> From: Asahi Lina <lina+kernel@...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+kernel@...hilina.net>
> Signed-off-by: Daniel Almeida <daniel.almeida@...labora.com>
> Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> Reviewed-by: Janne Grunau <j@...nau.net>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
> Taken from:
> https://lore.kernel.org/all/20251202220924.520644-3-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(+)
> 
> diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
> index dd60a5c6b142ec2c5fd6df80279ab6813163791c..ed80dd8088bc60c67b02f7666e602e33158bb962 100644
> --- a/rust/bindings/bindings_helper.h
> +++ b/rust/bindings/bindings_helper.h
> @@ -52,6 +52,7 @@
> #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>
> 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 0943d589b7578d3c0e207937f63a5e02719c6146..aae78c938b0b5848b1740fb3f2dc4b7f93b1a760 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 "drm_gpuvm.c"
> #include "err.c"
> 
> -- 
> 2.52.0.457.g6b5491de43-goog
> 
> 

Reviewed-by: Daniel Almeida <daniel.almeida@...labora.com>