mirror of
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>
62 lines
1.9 KiB
Rust
62 lines
1.9 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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use kernel::uapi;
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// TODO Work out some common infrastructure to avoid boilerplate code for uAPI abstractions.
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macro_rules! define_uapi_abstraction {
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($name:ident <= $inner:ty) => {
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#[repr(transparent)]
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pub struct $name(::kernel::types::Opaque<$inner>);
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impl ::core::convert::From<&::kernel::types::Opaque<$inner>> for &$name {
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fn from(value: &::kernel::types::Opaque<$inner>) -> Self {
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// SAFETY: `Self` is a transparent wrapper of `$inner`.
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unsafe { ::core::mem::transmute(value) }
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}
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}
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};
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}
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define_uapi_abstraction!(Getparam <= uapi::drm_nova_getparam);
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impl Getparam {
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pub fn param(&self) -> u64 {
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// SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_getparam`.
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unsafe { (*self.0.get()).param }
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}
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pub fn set_value(&self, v: u64) {
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// SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_getparam`.
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unsafe { (*self.0.get()).value = v };
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}
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}
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define_uapi_abstraction!(GemCreate <= uapi::drm_nova_gem_create);
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impl GemCreate {
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pub fn size(&self) -> u64 {
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// SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_gem_create`.
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unsafe { (*self.0.get()).size }
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}
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pub fn set_handle(&self, handle: u32) {
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// SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_gem_create`.
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unsafe { (*self.0.get()).handle = handle };
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}
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}
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define_uapi_abstraction!(GemInfo <= uapi::drm_nova_gem_info);
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impl GemInfo {
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pub fn handle(&self) -> u32 {
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// SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_gem_info`.
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unsafe { (*self.0.get()).handle }
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}
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pub fn set_size(&self, size: u64) {
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// SAFETY: `self.get()` is a valid pointer to a `struct drm_nova_gem_info`.
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unsafe { (*self.0.get()).size = size };
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}
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}
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