> On 11 Feb 2026, at 22:37, Deborah Brouwer <[email protected]>
> wrote:
>
> Add support for GEM buffer objects backed by shared memory.
>
> This introduces the BoCreateArgs structure for passing creation parameters
> including flags, and adds a flags field to BoData. A new_dummy_object()
> helper is provided to create a dummy GEM object for use as a GPUVM root.
>
> The Bo type alias is added to simplify working with Tyr's shmem-backed
> GEM objects throughout the driver.
>
> Co-developed-by: Boris Brezillon <[email protected]>
> Signed-off-by: Boris Brezillon <[email protected]>
> Signed-off-by: Deborah Brouwer <[email protected]>
> ---
> drivers/gpu/drm/tyr/gem.rs | 52 ++++++++++++++++++++++++++++++++------
> 1 file changed, 44 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/tyr/gem.rs b/drivers/gpu/drm/tyr/gem.rs
> index c1208d332dea..6a58f2da88d3 100644
> --- a/drivers/gpu/drm/tyr/gem.rs
> +++ b/drivers/gpu/drm/tyr/gem.rs
> @@ -1,28 +1,64 @@
> // SPDX-License-Identifier: GPL-2.0 or MIT
> +//! GEM buffer object management for the Tyr driver.
> +//!
> +//! This module provides buffer object (BO) management functionality using
> +//! DRM's GEM subsystem with shmem backing.
>
> use kernel::{
> drm::{
> gem,
> + gem::shmem,
> DeviceContext, //
> },
> - prelude::*, //
> + prelude::*,
> + sync::aref::ARef, //
> };
>
> -use crate::driver::TyrDrmDriver;
> +use crate::driver::{
> + TyrDrmDevice,
> + TyrDrmDriver, //
> +};
>
> -/// GEM Object inner driver data
> +/// Tyr's DriverObject type for GEM objects.
> #[pin_data]
> -pub(crate) struct BoData {}
> +pub(crate) struct BoData {
> + flags: u32,
> +}
> +
> +/// Provides a way to pass arguments when creating BoData
> +/// as required by the gem::DriverObject trait.
> +pub(crate) struct BoCreateArgs {
> + flags: u32,
> +}
>
> impl gem::DriverObject for BoData {
> type Driver = TyrDrmDriver;
> - type Args = ();
> + type Args = BoCreateArgs;
>
> fn new<Ctx: DeviceContext>(
> - _dev: &kernel::drm::Device<TyrDrmDriver, Ctx>,
> + _dev: &TyrDrmDevice<Ctx>,
Unrelated change?
> _size: usize,
> - _args: (),
> + args: BoCreateArgs,
> ) -> impl PinInit<Self, Error> {
> - try_pin_init!(BoData {})
> + try_pin_init!(Self { flags: args.flags })
> }
> }
> +
> +/// Type alias for Tyr GEM buffer objects.
> +pub(crate) type Bo = gem::shmem::Object<BoData>;
> +
> +/// Creates a dummy GEM object to serve as the root of a GPUVM.
> +#[expect(dead_code)]
> +pub(crate) fn new_dummy_object<Ctx: DeviceContext>(ddev: &TyrDrmDevice<Ctx>)
> -> Result<ARef<Bo>> {
> + let bo = gem::shmem::Object::<BoData>::new(
> + ddev,
> + 4096,
> + shmem::ObjectConfig {
> + map_wc: true,
> + parent_resv_obj: None,
> + },
> + BoCreateArgs { flags: 0 },
> + )?;
> +
> + Ok(bo)
> +}
> --
> 2.52.0
>
>
