[PATCH v5 0/4] Introduce DeviceContext

Lyude Paul
2026-01-31T00:16:22Z

Previous version of this patch series:
https://patchwork.freedesktop.org/series/160217/#rev3

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/

Series-wide changes

V2:
* s/DeviceCtx/DeviceContext/ for consistency
* Move private driver-data availability to the Registration
DeviceContext
* s/AnyCtx/Init/
V4:
* Split out DriverAllocImpl into it's own patch

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

Lyude Paul (4):
rust/drm: Introduce DeviceContext
rust/drm: Don't setup private driver data until registration
rust/drm/gem: Add DriverAllocImpl type alias
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 | 250 +++++++++++++++++++++++++--------
rust/kernel/drm/driver.rs | 52 +++++--
rust/kernel/drm/gem/mod.rs | 64 ++++++---
rust/kernel/drm/mod.rs | 4 +
8 files changed, 305 insertions(+), 101 deletions(-)

base-commit: cea7b66a80412e2a5b74627b89ae25f1d0110a4b
prerequisite-patch-id: ddb20be75c8fc92ba2d48a5c4aa8e724202de1ff
prerequisite-patch-id: 87e69cd89a806392d3275b19fbfb160d44d957c9
--
2.52.0