linux-kernel - [PATCH v3 0/3] Introduce DeviceContext

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Message-ID: <20260122225057.3589500-1-lyude@redhat.com>
Date: Thu, 22 Jan 2026 17:46:35 -0500
From: Lyude Paul <lyude@...hat.com>
To: linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Cc: nouveau@...ts.freedesktop.org,
	"Miguel Ojeda" <ojeda@...nel.org>,
	"Simona Vetter" <simona@...ll.ch>,
	"Alice Ryhl" <aliceryhl@...gle.com>,
	"Shankari Anand" <shankari.ak0208@...il.com>,
	"David Airlie" <airlied@...il.com>,
	"Benno Lossin" <lossin@...nel.org>,
	"Asahi Lina" <lina+kernel@...hilina.net>,
	"Daniel Almeida" <daniel.almeida@...labora.com>,
	"Lyude Paul" <lyude@...hat.com>
Subject: [PATCH v3 0/3] Introduce DeviceContext

Previous version of this patch series:
  https://patchwork.freedesktop.org/series/160217/#rev1

One of the unsolved issues we still have with the rust DRM bindings is
the ability to limit certain Device operations to contexts where we can
guarantee that a Device has been fully initialized and registered with
userspace, or vice-versa (e.g. must be unregistered).

While the previous solution for this that I had was simply not exposing
drm::Device at all until the device has been registered with userspace,
unfortunately this isn't enough since:

* As we found out with Tyr, drivers occasionally need to be able to
  create GEM objects before device registration
* We would still need to be able to handle KMS callbacks which could be
  invoked after KMS init but before userspace registration (not handled
  in this series specifically, but DeviceContext will be required for
  handling this).

This patch series provides a pretty nice solution to this, by
implementing a very similar solution to kernel::device::DeviceContext:
introducing our own DeviceContext type state.

This patch series depends on the two pre-requisite patch series:

* https://patchwork.freedesktop.org/series/160523/
* https://patchwork.freedesktop.org/series/160525/

                          Series-wide changes

V2:
* s/DeviceCtx/DeviceContext/ for consistency
* Move private driver-data availability to the Registration
  DeviceContext
* s/AnyCtx/Init/

More changes described in each patch description.

Lyude Paul (3):
  rust/drm: Introduce DeviceContext
  rust/drm: Don't setup private driver data until registration
  rust/drm/gem: Use DeviceContext with GEM objects

 drivers/gpu/drm/nova/driver.rs |  10 +-
 drivers/gpu/drm/nova/gem.rs    |  11 +-
 drivers/gpu/drm/tyr/driver.rs  |  12 +-
 drivers/gpu/drm/tyr/gem.rs     |   3 +-
 rust/kernel/drm/device.rs      | 246 +++++++++++++++++++++++++--------
 rust/kernel/drm/driver.rs      |  55 ++++++--
 rust/kernel/drm/gem/mod.rs     |  64 ++++++---
 rust/kernel/drm/mod.rs         |   4 +
 8 files changed, 303 insertions(+), 102 deletions(-)


base-commit: 6ea52b6d8f33ae627f4dcf43b12b6e713a8b9331
prerequisite-patch-id: d596b2a5a81fb067cb267fe30b6e2d8fd47fddad
prerequisite-patch-id: 32f09c643498c714d92a6a87b3de220b5d37b41e
prerequisite-patch-id: 28f11c925aab9ed9d4fa70dbbf2c4a7accb5c05d
-- 
2.52.0