Commit 1101c442 authored by Alistair Popple's avatar Alistair Popple Committed by Alexandre Courbot
Browse files

gpu: nova-core: Set correct DMA mask 



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

Signed-off-by: default avatarAlistair Popple <apopple@nvidia.com>
Signed-off-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Message-ID: <20251110-gsp_boot-v9-2-8ae4058e3c0e@nvidia.com>
parent 7c01dc25

drivers/gpu/nova-core/driver.rs

+16 −0
Original line number Diff line number Diff line
@@ -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,