Re: [PATCH 2/7] gpu: nova-core: Replace module_pci_driver! with explicit module init

[Gary Guo <gary@garyguo.net>]

On Fri, 12 Dec 2025 14:49:47 -0600
Timur Tabi <ttabi@nvidia.com> wrote:

> Replace the module_pci_driver! macro with an explicit module
> initialization using the standard module! macro and InPlaceModule
> trait implementation.  No functional change intended, with the
> exception that the driver now prints a message when loaded.
> 
> Also add a no-op module exit function as a template.
> 
> This change is necessary so that we can create a top-level "novacore"
> debugfs entry when the driver is loaded.
> 
> Signed-off-by: Timur Tabi <ttabi@nvidia.com>
> ---
>  drivers/gpu/nova-core/nova_core.rs | 29 ++++++++++++++++++++++++++---
>  1 file changed, 26 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/nova-core/nova_core.rs b/drivers/gpu/nova-core/nova_core.rs
> index b98a1c03f13d..7d7b75650b04 100644
> --- a/drivers/gpu/nova-core/nova_core.rs
> +++ b/drivers/gpu/nova-core/nova_core.rs
> @@ -2,6 +2,9 @@
>  
>  //! Nova Core GPU Driver
>  
> +use kernel::{error::Error, pci, prelude::*, InPlaceModule};
> +use pin_init::{PinInit, pinned_drop};
> +
>  #[macro_use]
>  mod bitfield;
>  
> @@ -21,13 +24,33 @@
>  
>  pub(crate) const MODULE_NAME: &kernel::str::CStr = <LocalModule as kernel::ModuleMetadata>::NAME;
>  
> -kernel::module_pci_driver! {
> -    type: driver::NovaCore,
> +#[pin_data(PinnedDrop)]
> +struct NovaCoreModule {
> +    #[pin]
> +    _driver: kernel::driver::Registration<pci::Adapter<driver::NovaCore>>,
> +}
> +
> +impl InPlaceModule for NovaCoreModule {
> +    fn init(module: &'static kernel::ThisModule) -> impl PinInit<Self, Error> {
> +        pr_info!("NovaCore GPU driver loaded\n");
> +        try_pin_init!(Self {
> +            _driver <- kernel::driver::Registration::new(MODULE_NAME, module),
> +        })
> +    }
> +}
> +
> +#[pinned_drop]
> +impl PinnedDrop for NovaCoreModule {
> +    fn drop(self: Pin<&mut Self>) {
> +    }
> +}

I don't see any subsequent patch that makes use of this added drop impl.
Why is it needed?

Best,
Gary

> +
> +module! {
> +    type: NovaCoreModule,
>      name: "NovaCore",
>      authors: ["Danilo Krummrich"],
>      description: "Nova Core GPU driver",
>      license: "GPL v2",
> -    firmware: [],
>  }
>  
>  kernel::module_firmware!(firmware::ModInfoBuilder);