mirror of https://github.com/torvalds/linux.git
111 lines
3.0 KiB
Rust
111 lines
3.0 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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use kernel::{
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auxiliary,
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c_str,
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device::Core,
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dma::Device,
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dma::DmaMask,
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pci,
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pci::{
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Class,
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ClassMask,
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Vendor, //
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},
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prelude::*,
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sizes::SZ_16M,
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sync::Arc, //
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};
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use crate::gpu::Gpu;
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#[pin_data]
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pub(crate) struct NovaCore {
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#[pin]
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pub(crate) gpu: Gpu,
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_reg: auxiliary::Registration,
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}
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const BAR0_SIZE: usize = SZ_16M;
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// For now we only support Ampere which can use up to 47-bit DMA addresses.
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//
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// TODO: Add an abstraction for this to support newer GPUs which may support
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// larger DMA addresses. Limiting these GPUs to smaller address widths won't
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// have any adverse affects, unless installed on systems which require larger
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// DMA addresses. These systems should be quite rare.
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const GPU_DMA_BITS: u32 = 47;
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pub(crate) type Bar0 = pci::Bar<BAR0_SIZE>;
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kernel::pci_device_table!(
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PCI_TABLE,
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MODULE_PCI_TABLE,
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<NovaCore as pci::Driver>::IdInfo,
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[
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// Modern NVIDIA GPUs will show up as either VGA or 3D controllers.
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(
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pci::DeviceId::from_class_and_vendor(
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Class::DISPLAY_VGA,
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ClassMask::ClassSubclass,
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Vendor::NVIDIA
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),
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()
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),
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(
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pci::DeviceId::from_class_and_vendor(
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Class::DISPLAY_3D,
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ClassMask::ClassSubclass,
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Vendor::NVIDIA
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),
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()
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),
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]
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);
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impl pci::Driver for NovaCore {
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type IdInfo = ();
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const ID_TABLE: pci::IdTable<Self::IdInfo> = &PCI_TABLE;
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fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
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dev_dbg!(pdev.as_ref(), "Probe Nova Core GPU driver.\n");
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pdev.enable_device_mem()?;
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pdev.set_master();
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// SAFETY: No concurrent DMA allocations or mappings can be made because
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// the device is still being probed and therefore isn't being used by
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// other threads of execution.
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unsafe { pdev.dma_set_mask_and_coherent(DmaMask::new::<GPU_DMA_BITS>())? };
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let devres_bar = Arc::pin_init(
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pdev.iomap_region_sized::<BAR0_SIZE>(0, c_str!("nova-core/bar0")),
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GFP_KERNEL,
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)?;
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// Used to provided a `&Bar0` to `Gpu::new` without tying it to the lifetime of
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// `devres_bar`.
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let bar_clone = Arc::clone(&devres_bar);
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let bar = bar_clone.access(pdev.as_ref())?;
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let this = KBox::pin_init(
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try_pin_init!(Self {
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gpu <- Gpu::new(pdev, devres_bar, bar),
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_reg: auxiliary::Registration::new(
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pdev.as_ref(),
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c_str!("nova-drm"),
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0, // TODO[XARR]: Once it lands, use XArray; for now we don't use the ID.
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crate::MODULE_NAME
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)?,
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}),
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GFP_KERNEL,
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)?;
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Ok(this)
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}
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fn unbind(pdev: &pci::Device<Core>, this: Pin<&Self>) {
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this.gpu.unbind(pdev.as_ref());
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}
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}
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