linux-kernel - Re: [PATCH v2 01/12] nova-core: falcon: Move waiting until halted to a helper

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Message-ID: <3e9db079a981d13e3eb9386dcaa5ca141e338d92.camel@redhat.com>
Date: Wed, 05 Nov 2025 18:12:42 -0500
From: Lyude Paul <lyude@...hat.com>
To: Joel Fernandes <joelagnelf@...dia.com>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 dakr@...nel.org, 	acourbot@...dia.com
Cc: Alistair Popple <apopple@...dia.com>, Miguel Ojeda <ojeda@...nel.org>, 
 Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>,
 Gary Guo <gary@...yguo.net>, 	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>,  Timur Tabi <ttabi@...dia.com>,
 joel@...lfernandes.org, nouveau@...ts.freedesktop.org
Subject: Re: [PATCH v2 01/12] nova-core: falcon: Move waiting until halted
 to a helper

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


On Sun, 2025-11-02 at 18:59 -0500, Joel Fernandes wrote:
> Move the "waiting until halted" functionality into a helper so that we
> can use it in the sequencer, which is a separate sequencer operation.
> 
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
> ---
>  drivers/gpu/nova-core/falcon.rs | 21 ++++++++++++++-------
>  1 file changed, 14 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
> index dc8c2179935e..dc883ce5f28b 100644
> --- a/drivers/gpu/nova-core/falcon.rs
> +++ b/drivers/gpu/nova-core/falcon.rs
> @@ -540,6 +540,19 @@ pub(crate) fn dma_load<F: FalconFirmware<Target = E>>(&self, bar: &Bar0, fw: &F)
>          Ok(())
>      }
>  
> +    /// Wait until the falcon CPU is halted.
> +    pub(crate) fn wait_till_halted(&self, bar: &Bar0) -> Result<()> {
> +        // TIMEOUT: arbitrarily large value, firmwares should complete in less than 2 seconds.
> +        read_poll_timeout(
> +            || Ok(regs::NV_PFALCON_FALCON_CPUCTL::read(bar, &E::ID)),
> +            |r| r.halted(),
> +            Delta::ZERO,
> +            Delta::from_secs(2),
> +        )?;
> +
> +        Ok(())
> +    }
> +
>      /// Runs the loaded firmware and waits for its completion.
>      ///
>      /// `mbox0` and `mbox1` are optional parameters to write into the `MBOX0` and `MBOX1` registers
> @@ -574,13 +587,7 @@ pub(crate) fn boot(
>                  .write(bar, &E::ID),
>          }
>  
> -        // TIMEOUT: arbitrarily large value, firmwares should complete in less than 2 seconds.
> -        read_poll_timeout(
> -            || Ok(regs::NV_PFALCON_FALCON_CPUCTL::read(bar, &E::ID)),
> -            |r| r.halted(),
> -            Delta::ZERO,
> -            Delta::from_secs(2),
> -        )?;
> +        self.wait_till_halted(bar)?;
>  
>          let (mbox0, mbox1) = (
>              regs::NV_PFALCON_FALCON_MAILBOX0::read(bar, &E::ID).value(),

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

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