From: Yury Norov <yury.norov@gmail.com>
To: Danilo Krummrich <dakr@kernel.org>
Cc: Joel Fernandes <joelagnelf@nvidia.com>,
Alexandre Courbot <acourbot@nvidia.com>,
linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
dri-devel@lists.freedesktop.org,
Alistair Popple <apopple@nvidia.com>,
Miguel Ojeda <ojeda@kernel.org>,
Alex Gaynor <alex.gaynor@gmail.com>,
Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
bjorn3_gh@protonmail.com, Benno Lossin <lossin@kernel.org>,
Andreas Hindborg <a.hindborg@kernel.org>,
Alice Ryhl <aliceryhl@google.com>,
Trevor Gross <tmgross@umich.edu>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
John Hubbard <jhubbard@nvidia.com>, Timur Tabi <ttabi@nvidia.com>,
joel@joelfernandes.org, Elle Rhumsaa <elle@weathered-steel.dev>,
Daniel Almeida <daniel.almeida@collabora.com>,
Andrea Righi <arighi@nvidia.com>,
nouveau@lists.freedesktop.org
Subject: Re: [PATCH v6 0/5] Introduce bitfield and move register macro to rust/kernel/
Date: Wed, 8 Oct 2025 10:28:15 -0400 [thread overview]
Message-ID: <aOZ0_7YQw81lyMWt@yury> (raw)
In-Reply-To: <DDCFLM3P5MCC.NEBRVTU7X2G3@kernel.org>
On Wed, Oct 08, 2025 at 12:08:59AM +0200, Danilo Krummrich wrote:
> Regarding the bitfields for page table management: Are we
> sure that we can use raw bitfields for this?
As per my current understanding we can't. Bitfields are not suitable for
direct I/O and considered as a data storage. In the current scheme:
regs::NV_PFALCON_FALCON_DMATRFBASE::default()
.set_base((dma_start >> 8) as u32)
.write(bar, &E::ID);
we account for endianess in the .write() method, which would be a part
of register API, not bitfields.
FYI: ARM64 is in process of dropping BE, and Linus announced the end
of BE support for RISC-V:
https://lore.kernel.org/all/CAHk-=wgYcOiFvsJzFb+HfB4n6Wj6zM5H5EghUMfpXSCzyQVSfA@mail.gmail.com/
Thanks,
Yury
next prev parent reply other threads:[~2025-12-13 12:46 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-03 15:47 [PATCH v6 0/5] Introduce bitfield and move register macro to rust/kernel/ Joel Fernandes
2025-10-03 15:47 ` [PATCH v6 1/5] nova-core: bitfield: Move bitfield-specific code from register! into new macro Joel Fernandes
2025-10-06 17:56 ` Edwin Peer
2025-10-07 6:49 ` Alexandre Courbot
2025-10-03 15:47 ` [PATCH v6 2/5] nova-core: bitfield: Add support for different storage widths Joel Fernandes
2025-10-03 15:47 ` [PATCH v6 3/5] nova-core: bitfield: Add support for custom visiblity Joel Fernandes
2025-10-03 15:47 ` [PATCH v6 4/5] rust: Move register and bitfield macros out of Nova Joel Fernandes
2025-10-06 10:38 ` Alexandre Courbot
2025-10-09 6:59 ` Dirk Behme
2025-10-09 11:16 ` Danilo Krummrich
2025-10-09 11:28 ` Alexandre Courbot
2025-10-09 12:54 ` Danilo Krummrich
2025-11-01 18:51 ` Dirk Behme
2025-11-02 3:00 ` Alexandre Courbot
2025-11-13 6:26 ` Dirk Behme
2025-10-10 7:28 ` Dirk Behme
2025-10-22 18:40 ` Beata Michalska
2025-10-22 19:37 ` Joel Fernandes
2025-10-23 13:55 ` Beata Michalska
2025-10-23 14:07 ` Danilo Krummrich
2025-10-23 21:47 ` Joel Fernandes
2025-10-23 21:50 ` Joel Fernandes
2025-10-27 9:06 ` Beata Michalska
2025-10-27 9:56 ` Danilo Krummrich
2025-10-27 15:05 ` Beata Michalska
2025-10-03 15:47 ` [PATCH v6 5/5] rust: bitfield: Add KUNIT tests for bitfield Joel Fernandes
2025-10-06 10:37 ` Alexandre Courbot
2025-10-06 19:38 ` Joel Fernandes
2025-10-06 20:36 ` [PATCH v7] " Joel Fernandes
2025-10-06 18:05 ` [PATCH v6 0/5] Introduce bitfield and move register macro to rust/kernel/ Edwin Peer
2025-10-06 22:29 ` Yury Norov
2025-10-07 10:36 ` Alexandre Courbot
2025-10-07 10:42 ` Miguel Ojeda
2025-10-07 13:20 ` Alexandre Courbot
2025-10-07 16:06 ` Yury Norov
2025-10-07 16:12 ` Miguel Ojeda
2025-10-07 13:16 ` Danilo Krummrich
2025-10-07 21:08 ` Joel Fernandes
2025-10-07 22:08 ` Danilo Krummrich
2025-10-08 14:28 ` Yury Norov [this message]
2025-10-08 15:00 ` Danilo Krummrich
2025-10-07 15:41 ` Yury Norov
2025-10-07 21:41 ` Daniel Almeida
2025-10-08 15:49 ` Yury Norov
-- strict thread matches above, loose matches on Subject: below --
2025-10-07 23:37 Joel Fernandes
2025-10-08 10:23 ` Danilo Krummrich
2025-10-08 10:47 ` Greg KH
2025-10-08 10:49 ` Danilo Krummrich
2025-10-09 0:24 ` Joel Fernandes
2025-10-09 13:02 ` Danilo Krummrich
2025-10-08 19:56 Joel Fernandes
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