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

Alistair Popple
Wed, 27 Aug 2025 08:19:58 -0000

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

Signed-off-by: Alistair Popple <apopple at nvidia.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