linux-kernel - Re: [PATCH 00/16] nova-core: run FWSEC-FRTS to perform first stage of GSP initialization

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Message-ID: <aAdV4kkCzkSeMNXy@cassiopeiae>
Date: Tue, 22 Apr 2025 10:40:02 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Alexandre Courbot <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 <benno.lossin@...ton.me>,
	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>,
	Jonathan Corbet <corbet@....net>,
	John Hubbard <jhubbard@...dia.com>, Ben Skeggs <bskeggs@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>, Alistair Popple <apopple@...dia.com>,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
	nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	Sergio González Collado <sergio.collado@...il.com>
Subject: Re: [PATCH 00/16] nova-core: run FWSEC-FRTS to perform first stage
 of GSP initialization

On Sun, Apr 20, 2025 at 09:19:32PM +0900, Alexandre Courbot wrote:
> Hi everyone,
> 
> This series is a continuation of my previous RFCs [1] to complete the
> first step of GSP booting (running the FWSEC-FRTS firmware extracted
> from the BIOS) on Ampere devices. While it is still far from bringing
> the GPU into a state where it can do anything useful, it sets up the
> basic layout of the driver upon which we can build in order to continue
> with the next steps of GSP booting, as well as supporting more chipsets.
> 
> Upon successful probe, the driver will display the range of the WPR2
> region constructed by FWSEC-FRTS:
> 
>   [   95.436000] NovaCore 0000:01:00.0: WPR2: 0xffc00000-0xffce0000
>   [   95.436002] NovaCore 0000:01:00.0: GPU instance built
> 
> This code is based on nova-next with the try_access_with patch [2].

Please make sure to compile with CLIPPY=1, the series has quite some clippy
warnings.

I also noticed that there are a lot of compiler warnings about unreachable pub
fields with rustc 1.78, whereas with the latest stable compiler there are none.

I'm not exactly sure why that is (and I haven't looked further), but the
corresponding fields indeed seem to have unnecessary pub visibility.

> There is still a bit of unsafe code where it is not desired, notably to
> transmute byte slices into types that implement FromBytes - this is
> because support for doing such transmute operations safely are not in
> the kernel crate yet.

I assume you refer to [3]? As long as we put a TODO and follow up once the
series lands, that's fine for me.

> 
> [1] https://lore.kernel.org/rust-for-linux/20250320-nova_timer-v3-0-79aa2ad25a79@nvidia.com/
> [2] https://lore.kernel.org/rust-for-linux/20250411-try_with-v4-0-f470ac79e2e2@nvidia.com/
[3] https://lore.kernel.org/lkml/20250330234039.29814-1-christiansantoslima21@gmail.com/