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|
// SPDX-License-Identifier: GPL-2.0
use kernel::{
auxiliary,
c_str,
device::Core,
dma::Device,
dma::DmaMask,
pci,
pci::{
Class,
ClassMask,
Vendor, //
},
prelude::*,
sizes::SZ_16M,
sync::Arc, //
};
use crate::gpu::Gpu;
#[pin_data]
pub(crate) struct NovaCore {
#[pin]
pub(crate) gpu: Gpu,
_reg: auxiliary::Registration,
}
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!(
PCI_TABLE,
MODULE_PCI_TABLE,
<NovaCore as pci::Driver>::IdInfo,
[
// Modern NVIDIA GPUs will show up as either VGA or 3D controllers.
(
pci::DeviceId::from_class_and_vendor(
Class::DISPLAY_VGA,
ClassMask::ClassSubclass,
Vendor::NVIDIA
),
()
),
(
pci::DeviceId::from_class_and_vendor(
Class::DISPLAY_3D,
ClassMask::ClassSubclass,
Vendor::NVIDIA
),
()
),
]
);
impl pci::Driver for NovaCore {
type IdInfo = ();
const ID_TABLE: pci::IdTable<Self::IdInfo> = &PCI_TABLE;
fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
dev_dbg!(pdev.as_ref(), "Probe Nova Core GPU driver.\n");
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,
)?;
// Used to provided a `&Bar0` to `Gpu::new` without tying it to the lifetime of
// `devres_bar`.
let bar_clone = Arc::clone(&devres_bar);
let bar = bar_clone.access(pdev.as_ref())?;
let this = KBox::pin_init(
try_pin_init!(Self {
gpu <- Gpu::new(pdev, devres_bar, bar),
_reg: auxiliary::Registration::new(
pdev.as_ref(),
c_str!("nova-drm"),
0, // TODO[XARR]: Once it lands, use XArray; for now we don't use the ID.
crate::MODULE_NAME
)?,
}),
GFP_KERNEL,
)?;
Ok(this)
}
fn unbind(pdev: &pci::Device<Core>, this: Pin<&Self>) {
this.gpu.unbind(pdev.as_ref());
}
}
|
