rust: drm: Add RegistrationData to drm::Driver

Add a RegistrationData GAT (Generic Associated Type) to drm::Driver.
The lifetime parameter is tied to the parent bus device binding scope.
Registration<'a, T> takes ownership of the data via Pin<KBox<_>>,
storing it with its real lifetime. The pointer is written to drm::Device
before drm_dev_register() to ensure it is already in place when ioctls
arrive.

Device<T, Registered>::registration_data_with() provides access with the
lifetime shortened from 'static via a pointer cast. Since
Registration::drop() calls drm_dev_unplug(), which performs an SRCU
barrier waiting for all drm_dev_enter() critical sections to complete,
the data is guaranteed to remain valid for the duration of any
RegistrationGuard.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Tested-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Link: https://patch.msgid.link/20260628145406.2107056-18-dakr@kernel.org
[ Move registration_data_unchecked() to Device<T, Registered> impl
  block. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

0 files changed, 0 insertions, 0 deletions