On Sat, Jun 8, 2024 at 11:16 PM Asahi Lina <lina@xxxxxxxxxxxxx> wrote:
>
>
>
> On 5/22/24 6:23 AM, Rob Herring wrote:
> > On Mon, May 20, 2024 at 07:20:50PM +0200, Danilo Krummrich wrote:
> >> From: Asahi Lina <lina@xxxxxxxxxxxxx>
> >>
> >> Add abstractions for DRM drivers and devices. These go together in one
> >> commit since both are fairly tightly coupled types.
> >>
> >> A few things have been stubbed out, to be implemented as further bits of
> >> the DRM subsystem are introduced.
> >>
> >> Signed-off-by: Asahi Lina <lina@xxxxxxxxxxxxx>
> >> Co-developed-by: Danilo Krummrich <dakr@xxxxxxxxxx>
> >> Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx>
> >> ---
> >> rust/bindings/bindings_helper.h | 2 +
> >> rust/kernel/drm/device.rs | 87 +++++++++
> >> rust/kernel/drm/drv.rs | 318 ++++++++++++++++++++++++++++++++
> >> rust/kernel/drm/mod.rs | 2 +
> >> 4 files changed, 409 insertions(+)
> >> create mode 100644 rust/kernel/drm/device.rs
> >> create mode 100644 rust/kernel/drm/drv.rs
> >
> > [...]
> >
> >> diff --git a/rust/kernel/drm/drv.rs b/rust/kernel/drm/drv.rs
> >> new file mode 100644
> >> index 000000000000..5dd8f3f8df7c
> >> --- /dev/null
> >> +++ b/rust/kernel/drm/drv.rs
> >> @@ -0,0 +1,318 @@
> >> +// SPDX-License-Identifier: GPL-2.0 OR MIT
> >> +
> >> +//! DRM driver core.
> >> +//!
> >> +//! C header: [`include/linux/drm/drm_drv.h`](../../../../include/linux/drm/drm_drv.h)
> >> +
> >> +use crate::{
> >> + alloc::flags::*,
> >> + bindings, device, drm,
> >> + error::code::*,
> >> + error::{Error, Result},
> >> + prelude::*,
> >> + private::Sealed,
> >> + str::CStr,
> >> + types::{ARef, ForeignOwnable},
> >> + ThisModule,
> >> +};
> >> +use core::{
> >> + marker::{PhantomData, PhantomPinned},
> >> + pin::Pin,
> >> +};
> >> +use macros::vtable;
> >> +
> >> +/// Driver use the GEM memory manager. This should be set for all modern drivers.
> >> +pub const FEAT_GEM: u32 = bindings::drm_driver_feature_DRIVER_GEM;
> >> +/// Driver supports mode setting interfaces (KMS).
> >> +pub const FEAT_MODESET: u32 = bindings::drm_driver_feature_DRIVER_MODESET;
> >> +/// Driver supports dedicated render nodes.
> >> +pub const FEAT_RENDER: u32 = bindings::drm_driver_feature_DRIVER_RENDER;
> >> +/// Driver supports the full atomic modesetting userspace API.
> >> +///
> >> +/// Drivers which only use atomic internally, but do not support the full userspace API (e.g. not
> >> +/// all properties converted to atomic, or multi-plane updates are not guaranteed to be tear-free)
> >> +/// should not set this flag.
> >> +pub const FEAT_ATOMIC: u32 = bindings::drm_driver_feature_DRIVER_ATOMIC;
> >> +/// Driver supports DRM sync objects for explicit synchronization of command submission.
> >> +pub const FEAT_SYNCOBJ: u32 = bindings::drm_driver_feature_DRIVER_SYNCOBJ;
> >> +/// Driver supports the timeline flavor of DRM sync objects for explicit synchronization of command
> >> +/// submission.
> >> +pub const FEAT_SYNCOBJ_TIMELINE: u32 = bindings::drm_driver_feature_DRIVER_SYNCOBJ_TIMELINE;
> >
> > This is missing an entry for DRIVER_GEM_GPUVA. And some others perhaps.
> > I suppose some are legacy which won't be needed any time soon if ever.
> > Not sure if you intend for this to be complete, or you are just adding
> > what you are using? Only FEAT_GEM is used by nova ATM.
> >
>
> This was developed before DRIVER_GEM_GPUVA existed ^^
>
> I have this in my branch since I'm using the GPUVA manager now.
TBC, I'm using it as well, not just providing drive-by comments. I'm
starting to look at converting panthor to rust.
> Danilo,
> what tree are you using for this submission? It would be good to
> coordinate this and try to keep the WIP branches from diverging too much...
Yes, please!
Besides asahi of course, there's several people[1][2][3] using the
platform and DT abstractions and we're all rebasing those. I'd
volunteer to maintain, but I don't know rust well enough yet to even
be dangerous... :)
Rob
[1] https://lore.kernel.org/all/cover.1717750631.git.viresh.kumar@xxxxxxxxxx/
[2] https://lore.kernel.org/all/20240322221305.1403600-1-lyude@xxxxxxxxxx/
[3] https://lore.kernel.org/all/CAPFo5VLoYGq_OgC5dqcueTyymuSCsLpjasLZnKO1jpY6gV7s2g@xxxxxxxxxxxxxx/
