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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>
50 lines
1.1 KiB
Rust
50 lines
1.1 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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use kernel::{
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drm,
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drm::{gem, gem::BaseObject},
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prelude::*,
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types::ARef,
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};
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use crate::{
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driver::{NovaDevice, NovaDriver},
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file::File,
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};
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/// GEM Object inner driver data
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#[pin_data]
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pub(crate) struct NovaObject {}
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impl gem::BaseDriverObject<gem::Object<NovaObject>> for NovaObject {
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fn new(_dev: &NovaDevice, _size: usize) -> impl PinInit<Self, Error> {
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try_pin_init!(NovaObject {})
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}
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}
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impl gem::DriverObject for NovaObject {
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type Driver = NovaDriver;
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}
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impl NovaObject {
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/// Create a new DRM GEM object.
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pub(crate) fn new(dev: &NovaDevice, size: usize) -> Result<ARef<gem::Object<Self>>> {
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let aligned_size = size.next_multiple_of(1 << 12);
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if size == 0 || size > aligned_size {
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return Err(EINVAL);
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}
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gem::Object::new(dev, aligned_size)
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}
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/// Look up a GEM object handle for a `File` and return an `ObjectRef` for it.
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#[inline]
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pub(crate) fn lookup_handle(
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file: &drm::File<File>,
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handle: u32,
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) -> Result<ARef<gem::Object<Self>>> {
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gem::Object::lookup_handle(file, handle)
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}
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}
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