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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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cdeaeb9dd7
Add the initial nova-drm driver skeleton.
nova-drm is connected to nova-core through the auxiliary bus and
implements the DRM parts of the nova driver stack.
For now, it implements the fundamental DRM abstractions, i.e. creates a
DRM device and registers it, exposing a three sample IOCTLs.
DRM_IOCTL_NOVA_GETPARAM
- provides the PCI bar size from the bar that maps the GPUs VRAM
from nova-core
DRM_IOCTL_NOVA_GEM_CREATE
- creates a new dummy DRM GEM object and returns a handle
DRM_IOCTL_NOVA_GEM_INFO
- provides metadata for the DRM GEM object behind a given handle
I implemented a small userspace test suite [1] that utilizes this
interface.
Link: https://gitlab.freedesktop.org/dakr/drm-test [1]
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Acked-by: Dave Airlie <airlied@redhat.com>
Link: https://lore.kernel.org/r/20250424160452.8070-3-dakr@kernel.org
[ Kconfig: depend on DRM=y rather than just DRM. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
70 lines
1.9 KiB
Rust
70 lines
1.9 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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use kernel::{auxiliary, c_str, device::Core, drm, drm::gem, drm::ioctl, prelude::*, types::ARef};
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use crate::file::File;
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use crate::gem::NovaObject;
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pub(crate) struct NovaDriver {
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#[expect(unused)]
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drm: ARef<drm::Device<Self>>,
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}
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/// Convienence type alias for the DRM device type for this driver
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pub(crate) type NovaDevice = drm::Device<NovaDriver>;
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#[pin_data]
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pub(crate) struct NovaData {
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pub(crate) adev: ARef<auxiliary::Device>,
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}
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const INFO: drm::DriverInfo = drm::DriverInfo {
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major: 0,
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minor: 0,
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patchlevel: 0,
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name: c_str!("nova"),
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desc: c_str!("Nvidia Graphics"),
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};
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const NOVA_CORE_MODULE_NAME: &CStr = c_str!("NovaCore");
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const AUXILIARY_NAME: &CStr = c_str!("nova-drm");
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kernel::auxiliary_device_table!(
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AUX_TABLE,
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MODULE_AUX_TABLE,
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<NovaDriver as auxiliary::Driver>::IdInfo,
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[(
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auxiliary::DeviceId::new(NOVA_CORE_MODULE_NAME, AUXILIARY_NAME),
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()
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)]
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);
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impl auxiliary::Driver for NovaDriver {
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type IdInfo = ();
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const ID_TABLE: auxiliary::IdTable<Self::IdInfo> = &AUX_TABLE;
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fn probe(adev: &auxiliary::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
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let data = try_pin_init!(NovaData { adev: adev.into() });
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let drm = drm::Device::<Self>::new(adev.as_ref(), data)?;
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drm::Registration::new_foreign_owned(&drm, adev.as_ref(), 0)?;
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Ok(KBox::new(Self { drm }, GFP_KERNEL)?.into())
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}
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}
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#[vtable]
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impl drm::Driver for NovaDriver {
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type Data = NovaData;
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type File = File;
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type Object = gem::Object<NovaObject>;
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const INFO: drm::DriverInfo = INFO;
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kernel::declare_drm_ioctls! {
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(NOVA_GETPARAM, drm_nova_getparam, ioctl::RENDER_ALLOW, File::get_param),
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(NOVA_GEM_CREATE, drm_nova_gem_create, ioctl::AUTH | ioctl::RENDER_ALLOW, File::gem_create),
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(NOVA_GEM_INFO, drm_nova_gem_info, ioctl::AUTH | ioctl::RENDER_ALLOW, File::gem_info),
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}
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}
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