rust: drm: restrict AlwaysRefCounted to Normal GEM Object context

Restrict AlwaysRefCounted for gem::Object and gem::shmem::Object to the
Normal context, since only Normal objects should be independently
reference-counted.

To avoid cascading through IntoGEMObject (which had AlwaysRefCounted as
a supertrait), remove AlwaysRefCounted from IntoGEMObject's supertraits
and instead add it as an explicit bound on lookup_handle(), which is the
only BaseObject method that returns an ARef.

Since Object::new() and shmem::Object::new() return ARef<Self>, move
them to Normal-only impl blocks. Similarly, simplify ObjectConfig and
shmem's parent_resv_obj field to the Normal context.

Remove the DeviceContext generic from DriverObject::new() and
Driver::Object, since GEM objects can only be constructed in the Normal
context. Simplify DriverAllocImpl accordingly.

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/20260628145406.2107056-8-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

0 files changed, 0 insertions, 0 deletions