Re: [PATCH v4 09/33] gpu: nova-core: Hopper/Blackwell: skip GFW boot waiting

["Danilo Krummrich" <dakr@kernel.org>]

On Tue Feb 10, 2026 at 3:45 AM CET, John Hubbard wrote:
> Hopper and Blackwell GPUs use FSP-based secure boot and do not require
> waiting for GFW_BOOT completion. Skip this step for these architectures.
>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
> ---
>  drivers/gpu/nova-core/gpu.rs | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs
> index 24feb0e8723e..f04e2a795e90 100644
> --- a/drivers/gpu/nova-core/gpu.rs
> +++ b/drivers/gpu/nova-core/gpu.rs
> @@ -304,10 +304,19 @@ pub(crate) fn new<'a>(
>          let chipset = spec.chipset();
>  
>          try_pin_init!(Self {
> -            // We must wait for GFW_BOOT completion before doing any significant setup on the GPU.
> +            // Turing, Ampere, Ada: we must wait for GFW_BOOT completion before doing any
> +            // significant setup on the GPU.
> +            //
> +            // Hopper/Blackwell: skip GFW_BOOT completion waiting entirely, and use the simpler FSP
> +            // Chain of Trust boot path (elsewhere) instead.
>              _: {
> -                gfw::wait_gfw_boot_completion(bar)
> -                    .inspect_err(|_| dev_err!(pdev, "GFW boot did not complete\n"))?;
> +                if matches!(
> +                    chipset.arch(),
> +                    Architecture::Turing | Architecture::Ampere | Architecture::Ada

I assume Blackwell is not an exception and we expect this to be the case for
future architectures as well? I.e. checking for "!Architecture::Blackwell" makes
no sense?

> +                ) {
> +                    gfw::wait_gfw_boot_completion(bar)
> +                        .inspect_err(|_| dev_err!(pdev, "GFW boot did not complete\n"))?;
> +                }
>              },