linux-kernel - Re: [PATCH v5 10/13] gpu: nova-core: sequencer: Implement basic core operations

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Message-ID: <0aa30352fc8676bba92ac6bf0f5144b6cc3c25e9.camel@redhat.com>
Date: Fri, 14 Nov 2025 16:56:55 -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, Danilo
 Krummrich <dakr@...nel.org>, Alexandre Courbot <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, Daniel Almeida <daniel.almeida@...labora.com>, 
	nouveau@...ts.freedesktop.org
Subject: Re: [PATCH v5 10/13] gpu: nova-core: sequencer: Implement basic
 core operations

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

On Fri, 2025-11-14 at 14:55 -0500, Joel Fernandes wrote:
> These opcodes implement various falcon-related boot operations: reset,
> start, wait-for-halt.
> 
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
> ---
>  drivers/gpu/nova-core/gsp/sequencer.rs | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/drivers/gpu/nova-core/gsp/sequencer.rs b/drivers/gpu/nova-core/gsp/sequencer.rs
> index 19bde9b8bf1d..8d996e5e71c3 100644
> --- a/drivers/gpu/nova-core/gsp/sequencer.rs
> +++ b/drivers/gpu/nova-core/gsp/sequencer.rs
> @@ -68,6 +68,9 @@ pub(crate) enum GspSeqCmd {
>      RegPoll(fw::RegPollPayload),
>      DelayUs(fw::DelayUsPayload),
>      RegStore(fw::RegStorePayload),
> +    CoreReset,
> +    CoreStart,
> +    CoreWaitForHalt,
>  }
>  
>  impl GspSeqCmd {
> @@ -102,6 +105,9 @@ pub(crate) fn new(data: &[u8], dev: &device::Device) -> Result<(Self, usize)> {
>                  let size = opcode_size + size_of_val(&payload);
>                  (GspSeqCmd::RegStore(payload), size)
>              }
> +            fw::SeqBufOpcode::CoreReset => (GspSeqCmd::CoreReset, opcode_size),
> +            fw::SeqBufOpcode::CoreStart => (GspSeqCmd::CoreStart, opcode_size),
> +            fw::SeqBufOpcode::CoreWaitForHalt => (GspSeqCmd::CoreWaitForHalt, opcode_size),
>              _ => return Err(EINVAL),
>          };
>  
> @@ -210,6 +216,19 @@ fn run(&self, seq: &GspSequencer<'_>) -> Result {
>              GspSeqCmd::RegPoll(cmd) => cmd.run(seq),
>              GspSeqCmd::DelayUs(cmd) => cmd.run(seq),
>              GspSeqCmd::RegStore(cmd) => cmd.run(seq),
> +            GspSeqCmd::CoreReset => {
> +                seq.gsp_falcon.reset(seq.bar)?;
> +                seq.gsp_falcon.dma_reset(seq.bar);
> +                Ok(())
> +            }
> +            GspSeqCmd::CoreStart => {
> +                seq.gsp_falcon.start(seq.bar)?;
> +                Ok(())
> +            }
> +            GspSeqCmd::CoreWaitForHalt => {
> +                seq.gsp_falcon.wait_till_halted(seq.bar)?;
> +                Ok(())
> +            }
>          }
>      }
>  }

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

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