linux-kernel - [PATCH 5/5] rust: samples: dma: set DMA mask

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Message-ID: <20250710194556.62605-6-dakr@kernel.org>
Date: Thu, 10 Jul 2025 21:45:47 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: abdiel.janulgue@...il.com,
	daniel.almeida@...labora.com,
	robin.murphy@....com,
	a.hindborg@...nel.org,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	lossin@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu,
	bhelgaas@...gle.com,
	kwilczynski@...nel.org,
	gregkh@...uxfoundation.org,
	rafael@...nel.org
Cc: rust-for-linux@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH 5/5] rust: samples: dma: set DMA mask

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

Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 samples/rust/rust_dma.rs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/samples/rust/rust_dma.rs b/samples/rust/rust_dma.rs
index 9e05d5c0cdae..b295c346252f 100644
--- a/samples/rust/rust_dma.rs
+++ b/samples/rust/rust_dma.rs
@@ -4,7 +4,14 @@
 //!
 //! To make this driver probe, QEMU must be run with `-device pci-testdev`.
 
-use kernel::{bindings, device::Core, dma::CoherentAllocation, pci, prelude::*, types::ARef};
+use kernel::{
+    bindings,
+    device::Core,
+    dma::{CoherentAllocation, Device, dma_bit_mask},
+    pci,
+    prelude::*,
+    types::ARef,
+};
 
 struct DmaSampleDriver {
     pdev: ARef<pci::Device>,
@@ -51,6 +58,9 @@ impl pci::Driver for DmaSampleDriver {
     fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
         dev_info!(pdev.as_ref(), "Probe DMA test driver.\n");
 
+        // SAFETY: There are no concurrent calls to DMA allocation and mapping primitives.
+        unsafe { pdev.dma_set_mask_and_coherent(dma_bit_mask(64))? };
+
         let ca: CoherentAllocation<MyStruct> =
             CoherentAllocation::alloc_coherent(pdev.as_ref(), TEST_VALUES.len(), GFP_KERNEL)?;
 
-- 
2.50.0