linux-kernel - Re: [PATCH v2 04/12] nova-core: falcon: Move dma

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Message-ID: <d0c512416ac12a57a98b061a2810d4bba7bacded.camel@redhat.com>
Date: Wed, 05 Nov 2025 18:16:49 -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 04/12] nova-core: falcon: Move dma_reset
 functionality into helper

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

On Sun, 2025-11-02 at 18:59 -0500, Joel Fernandes wrote:
> Move dma_reset so we can use it for the upcoming sequencer
> functionality.
> 
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
> ---
>  drivers/gpu/nova-core/falcon.rs | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs
> index 181347feb3ca..964033ded3f2 100644
> --- a/drivers/gpu/nova-core/falcon.rs
> +++ b/drivers/gpu/nova-core/falcon.rs
> @@ -371,6 +371,12 @@ pub(crate) fn new(dev: &device::Device, chipset: Chipset) -> Result<Self> {
>          })
>      }
>  
> +    /// Resets DMA-related registers.
> +    pub(crate) fn dma_reset(&self, bar: &Bar0) {
> +        regs::NV_PFALCON_FBIF_CTL::update(bar, &E::ID, |v| v.set_allow_phys_no_ctx(true));
> +        regs::NV_PFALCON_FALCON_DMACTL::default().write(bar, &E::ID);
> +    }
> +
>      /// Wait for memory scrubbing to complete.
>      fn reset_wait_mem_scrubbing(&self, bar: &Bar0) -> Result {
>          // TIMEOUT: memory scrubbing should complete in less than 20ms.
> @@ -520,8 +526,7 @@ fn dma_wr<F: FalconFirmware<Target = E>>(
>  
>      /// Perform a DMA load into `IMEM` and `DMEM` of `fw`, and prepare the falcon to run it.
>      pub(crate) fn dma_load<F: FalconFirmware<Target = E>>(&self, bar: &Bar0, fw: &F) -> Result {
> -        regs::NV_PFALCON_FBIF_CTL::update(bar, &E::ID, |v| v.set_allow_phys_no_ctx(true));
> -        regs::NV_PFALCON_FALCON_DMACTL::default().write(bar, &E::ID);
> +        self.dma_reset(bar);
>          regs::NV_PFALCON_FBIF_TRANSCFG::update(bar, &E::ID, 0, |v| {
>              v.set_target(FalconFbifTarget::CoherentSysmem)
>                  .set_mem_type(FalconFbifMemType::Physical)

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

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