linux-kernel - Re: [PATCH v6 0/5] Introduce bitfield and move register macro to rust/kernel/

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Message-ID: <22e8c33c-b444-4f58-b7ec-6374475e05be@nvidia.com>
Date: Wed, 8 Oct 2025 20:24:20 -0400
From: Joel Fernandes <joelagnelf@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>, Yury Norov
 <yury.norov@...il.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
 "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
 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" <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" <joel@...lfernandes.org>,
 Elle Rhumsaa <elle@...thered-steel.dev>,
 Daniel Almeida <daniel.almeida@...labora.com>,
 Andrea Righi <arighi@...dia.com>,
 "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH v6 0/5] Introduce bitfield and move register macro to
 rust/kernel/

On 10/8/2025 6:23 AM, Danilo Krummrich wrote:
> On Wed Oct 8, 2025 at 1:37 AM CEST, Joel Fernandes wrote:
>> The Nvidia GPU architecture is little-endian (including MMU structures in VRAM).
> 
> Yes, I'm aware (and I'd assume that there is no reason to ever change that).
> 
> Just for the complete picture, there's also some endianness switch in the
> NV_PMC_BOOT_1 register I think?

You are referring to old GPUs. NV_PMC_BOOT_1 does not have endianness switch for
Turing and later.

>> All the CPU architectures our drivers support are expected to be little-endian.
> 
> Technically, all Rust supported architectures are indeed little-endian.
> 

Ok.

> However, the only constraint for the Nova project as by now is 64-bit only.

Ok.

Modern Nvidia GPUs only boot on x86 and ARM CPUs. There is BIOS/UEFI support
also that is needed for specific CPU architectures.

If we want to add a Kconfig patch enabling Nova only on x86/ARM, that'll be Ok
with me.

hope this helps, thanks,

 - Joel