drm: nova: Use drm::Device<Registered> to access the parent bus device

The get_param ioctl needs access to the parent auxiliary device. Since
ioctl handlers run inside a RegistrationGuard, accept
&NovaDevice<Registered> to obtain &auxiliary::Device<Bound> via as_ref()
directly. This removes the need for drm::Device data, hence set it to
().

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/20260628145406.2107056-20-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

2 files changed, 6 insertions, 12 deletions

diff --git a/drivers/gpu/drm/nova/driver.rs b/drivers/gpu/drm/nova/driver.rs
index bd2a55405db8..739690bc2db5 100644
--- a/drivers/gpu/drm/nova/driver.rs
+++ b/drivers/gpu/drm/nova/driver.rs
@@ -29,11 +29,6 @@ pub(crate) struct Nova<'bound> {
 /// Convienence type alias for the DRM device type for this driver
 pub(crate) type NovaDevice<Ctx = drm::Normal> = drm::Device<NovaDriver, Ctx>;
 
-#[pin_data]
-pub(crate) struct NovaData {
-    pub(crate) adev: ARef<auxiliary::Device>,
-}
-
 const INFO: drm::DriverInfo = drm::DriverInfo {
     major: 0,
     minor: 0,
@@ -64,9 +59,7 @@ impl auxiliary::Driver for NovaDriver {
         adev: &'bound auxiliary::Device<Core<'_>>,
         _info: &'bound Self::IdInfo,
     ) -> impl PinInit<Self::Data<'bound>, Error> + 'bound {
-        let data = try_pin_init!(NovaData { adev: adev.into() });
-
-        let drm = drm::UnregisteredDevice::<Self>::new(adev, data)?;
+        let drm = drm::UnregisteredDevice::<Self>::new(adev, Ok(()))?;
         // SAFETY: `reg` is stored in `Nova` and dropped when the driver is unbound; it is
         // never forgotten.
         let reg = unsafe { drm::Registration::new(adev.as_ref(), drm, (), 0)? };
@@ -80,7 +73,7 @@ impl auxiliary::Driver for NovaDriver {
 
 #[vtable]
 impl drm::Driver for NovaDriver {
-    type Data = NovaData;
+    type Data = ();
     type RegistrationData<'a> = ();
     type File = File;
     type Object = gem::Object<NovaObject>;
diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs
index 208be4e38188..298c02bacb4b 100644
--- a/drivers/gpu/drm/nova/file.rs
+++ b/drivers/gpu/drm/nova/file.rs
@@ -4,6 +4,8 @@ use crate::driver::{NovaDevice, NovaDriver};
 use crate::gem::NovaObject;
 use kernel::{
     alloc::flags::*,
+    auxiliary,
+    device::Bound,
     drm::{
         self,
         gem::BaseObject,
@@ -32,9 +34,8 @@ impl File {
         getparam: &mut uapi::drm_nova_getparam,
         _file: &drm::File<File>,
     ) -> Result<u32> {
-        let adev = &dev.adev;
-        let parent = adev.parent();
-        let pdev: &pci::Device = parent.try_into()?;
+        let adev: &auxiliary::Device<Bound> = dev.as_ref();
+        let pdev: &pci::Device<Bound> = adev.parent().try_into()?;
 
         let value = match getparam.param as u32 {
             uapi::NOVA_GETPARAM_VRAM_BAR_SIZE => pdev.resource_len(1)?,