linux-kernel - [PATCH v14 10/11] rust: samples: dma: set DMA mask

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Message-ID: <20250311174930.2348813-11-abdiel.janulgue@gmail.com>
Date: Tue, 11 Mar 2025 19:48:06 +0200
From: Abdiel Janulgue <abdiel.janulgue@...il.com>
To: rust-for-linux@...r.kernel.org,
	daniel.almeida@...labora.com,
	dakr@...nel.org,
	robin.murphy@....com,
	aliceryhl@...gle.com
Cc: 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>,
	Trevor Gross <tmgross@...ch.edu>,
	Valentin Obst <kernel@...entinobst.de>,
	linux-kernel@...r.kernel.org (open list),
	Christoph Hellwig <hch@....de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	airlied@...hat.com,
	iommu@...ts.linux.dev (open list:DMA MAPPING HELPERS),
	Abdiel Janulgue <abdiel.janulgue@...il.com>
Subject: [PATCH v14 10/11] rust: samples: dma: set DMA mask

From: Danilo Krummrich <dakr@...nel.org>

Set a DMA mask for the `pci::Device` in the Rust DMA sample driver.

Signed-off-by: Danilo Krummrich <dakr@...nel.org>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@...il.com>
---
 samples/rust/rust_dma.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/samples/rust/rust_dma.rs b/samples/rust/rust_dma.rs
index 4c7ebf66647a..39b6050aa3b6 100644
--- a/samples/rust/rust_dma.rs
+++ b/samples/rust/rust_dma.rs
@@ -4,7 +4,12 @@
 //!
 //! To make this driver probe, QEMU must be run with `-device pci-testdev`.
 
-use kernel::{bindings, dma::CoherentAllocation, pci, prelude::*};
+use kernel::{
+    bindings,
+    dma::{CoherentAllocation, Device},
+    pci,
+    prelude::*,
+};
 
 struct DmaSampleDriver {
     pdev: pci::Device,
@@ -51,6 +56,8 @@ impl pci::Driver for DmaSampleDriver {
     fn probe(pdev: &mut pci::Device, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
         dev_info!(pdev.as_ref(), "Probe DMA test driver.\n");
 
+        pdev.dma_set_mask_and_coherent(kernel::dma::dma_bit_mask(64))?;
+
         let ca: CoherentAllocation<MyStruct> =
             CoherentAllocation::alloc_coherent(pdev, TEST_VALUES.len(), GFP_KERNEL)?;
 
-- 
2.43.0