linux-kernel - [PATCH 01/10] gpu: nova-core: Set correct DMA mask

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Message-ID: <20250827082015.959430-2-apopple@nvidia.com>
Date: Wed, 27 Aug 2025 18:19:58 +1000
From: Alistair Popple <apopple@...dia.com>
To: dri-devel@...ts.freedesktop.org,
	dakr@...nel.org,
	acourbot@...dia.com
Cc: Alistair Popple <apopple@...dia.com>,
	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 <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	John Hubbard <jhubbard@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>,
	linux-kernel@...r.kernel.org,
	nouveau@...ts.freedesktop.org
Subject: [PATCH 01/10] gpu: nova-core: Set correct DMA mask

Set the correct DMA mask. Without this DMA will fail on some setups.

Signed-off-by: Alistair Popple <apopple@...dia.com>
---
 drivers/gpu/nova-core/driver.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/nova-core/driver.rs b/drivers/gpu/nova-core/driver.rs
index 274989ea1fb4a..3e154ffb6be4b 100644
--- a/drivers/gpu/nova-core/driver.rs
+++ b/drivers/gpu/nova-core/driver.rs
@@ -1,6 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
 
-use kernel::{auxiliary, bindings, c_str, device::Core, pci, prelude::*, sizes::SZ_16M, sync::Arc};
+use kernel::{
+    auxiliary, bindings, c_str, device::Core, dma::Device, dma::DmaMask, pci, prelude::*,
+    sizes::SZ_16M, sync::Arc,
+};
 
 use crate::gpu::Gpu;
 
@@ -34,6 +37,9 @@ fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self
         pdev.enable_device_mem()?;
         pdev.set_master();
 
+        // SAFETY: No DMA allocations have been made yet
+        unsafe { pdev.dma_set_mask_and_coherent(DmaMask::new::<48>())? };
+
         let bar = Arc::pin_init(
             pdev.iomap_region_sized::<BAR0_SIZE>(0, c_str!("nova-core/bar0")),
             GFP_KERNEL,
-- 
2.47.2