linux-kernel - Re: [PATCH v2 09/10] nova-core: falcon: Add support to write firmware version

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Message-ID: <929da04e71b03884a5e9b48168db1131449c9435.camel@redhat.com>
Date: Wed, 24 Sep 2025 18:14:00 -0400
From: Lyude Paul <lyude@...hat.com>
To: Alistair Popple <apopple@...dia.com>, rust-for-linux@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, dakr@...nel.org, acourbot@...dia.com
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron	 <bjorn3_gh@...tonmail.com>, Benno
 Lossin <lossin@...nel.org>, Andreas Hindborg	 <a.hindborg@...nel.org>,
 Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross	 <tmgross@...ch.edu>, David
 Airlie <airlied@...il.com>, Simona Vetter	 <simona@...ll.ch>, Maarten
 Lankhorst <maarten.lankhorst@...ux.intel.com>,  Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, John Hubbard
 <jhubbard@...dia.com>,  Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi
 <ttabi@...dia.com>, linux-kernel@...r.kernel.org, 
	nouveau@...ts.freedesktop.org
Subject: Re: [PATCH v2 09/10] nova-core: falcon: Add support to write
 firmware version

Reviewed-b: Lyude Paul <lyude@...hat.com>

On Mon, 2025-09-22 at 21:30 +1000, Alistair Popple wrote:
> From: Joel Fernandes <joelagnelf@...dia.com>
> 
> This will be needed by both the GSP boot code as well as GSP resume code
> in the sequencer.
> 
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
> ---
>  drivers/gpu/nova-core/falcon.rs | 9 +++++++++
>  drivers/gpu/nova-core/regs.rs   | 6 ++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
> index c7907f16bcf4..0cb7821341ed 100644
> --- a/drivers/gpu/nova-core/falcon.rs
> +++ b/drivers/gpu/nova-core/falcon.rs
> @@ -619,4 +619,13 @@ pub(crate) fn is_riscv_active(&self, bar: &Bar0) -> Result<bool> {
>          let cpuctl = regs::NV_PRISCV_RISCV_CPUCTL::read(bar, &E::ID);
>          Ok(cpuctl.active_stat())
>      }
> +
> +    /// Write the application version to the OS register.
> +    #[expect(dead_code)]
> +    pub(crate) fn write_os_version(&self, bar: &Bar0, app_version: u32) -> Result<()> {
> +        regs::NV_PFALCON_FALCON_OS::default()
> +            .set_value(app_version)
> +            .write(bar, &E::ID);
> +        Ok(())
> +    }
>  }
> diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
> index 5df6a2bf42ad..d9212fa50197 100644
> --- a/drivers/gpu/nova-core/regs.rs
> +++ b/drivers/gpu/nova-core/regs.rs
> @@ -215,6 +215,12 @@ pub(crate) fn vga_workspace_addr(self) -> Option<u64> {
>      31:0    value as u32;
>  });
>  
> +// Used to store version information about the firmware running
> +// on the Falcon processor.
> +register!(NV_PFALCON_FALCON_OS @ PFalconBase[0x00000080] {
> +    31:0    value as u32;
> +});
> +
>  register!(NV_PFALCON_FALCON_RM @ PFalconBase[0x00000084] {
>      31:0    value as u32;
>  });

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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