rust: drm: add Ioctl device context typestate

Add the Ioctl DeviceContext for DRM devices that have been registered
with userspace previously.

A Device<T, Ioctl> has been registered at some point, but may be
concurrently unregistering or already unregistered. drm_dev_enter() can
guard against this, ensuring the device remains registered for the
duration of the critical section.

This typestate will be used in ioctl dispatch context where registration
is guaranteed by the DRM core, and RegistrationGuard can safely be
acquired.

Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Link: https://patch.msgid.link/20260628145406.2107056-12-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

0 files changed, 0 insertions, 0 deletions