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gpu: nova-core: Set correct DMA mask

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

Signed-off-by: Alistair Popple <apopple@nvidia.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Message-ID: <20251110-gsp_boot-v9-2-8ae4058e3c0e@nvidia.com>
This commit is contained in:
Alistair Popple 2025-11-10 22:34:10 +09:00 committed by Alexandre Courbot
parent 7c01dc25f5
commit 1101c44241
1 changed files with 16 additions and 0 deletions
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16
drivers/gpu/nova-core/driver.rs
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@ -4,6 +4,8 @@
auxiliary,
c_str,
device::Core,
dma::Device,
dma::DmaMask,
pci,
pci::{
Class,
@ -25,6 +27,15 @@ pub(crate) struct NovaCore {
}
const BAR0_SIZE: usize = SZ_16M;
// For now we only support Ampere which can use up to 47-bit DMA addresses.
//
// TODO: Add an abstraction for this to support newer GPUs which may support
// larger DMA addresses. Limiting these GPUs to smaller address widths won't
// have any adverse affects, unless installed on systems which require larger
// DMA addresses. These systems should be quite rare.
const GPU_DMA_BITS: u32 = 47;
pub(crate) type Bar0 = pci::Bar<BAR0_SIZE>;
kernel::pci_device_table!(
@ -62,6 +73,11 @@ fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self
pdev.enable_device_mem()?;
pdev.set_master();
// SAFETY: No concurrent DMA allocations or mappings can be made because
// the device is still being probed and therefore isn't being used by
// other threads of execution.
unsafe { pdev.dma_set_mask_and_coherent(DmaMask::new::<GPU_DMA_BITS>())? };
let devres_bar = Arc::pin_init(
pdev.iomap_region_sized::<BAR0_SIZE>(0, c_str!("nova-core/bar0")),
GFP_KERNEL,