linux-kernel - Re: [PATCH 00/11] rust: add support for Port io

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Message-ID: <aCNiDPgMGZ-tD66n@my-computer>
Date: Tue, 13 May 2025 10:15:24 -0500
From: Andrew Ballance <andrewjballance@...il.com>
To: Arnd Bergmann <arnd@...db.de>
Cc: Danilo Krummrich <dakr@...nel.org>, Dave Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>, bhelgaas@...gle.com,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Raag Jadav <raag.jadav@...el.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, me@...enk.dev,
	FUJITA Tomonori <fujita.tomonori@...il.com>,
	daniel.almeida@...labora.com,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 00/11] rust: add support for Port io

On Fri, May 09, 2025 at 07:53:31AM +0200, Arnd Bergmann wrote:
> Can you describe here why you want to support both "Io" and "PortIo"
> cases separately? I don't think we need to micro-optimize for
> legacy ISA devices any more, so I'd hope the "Io" path would be
> sufficient to cover the common outliers (ata, uart, vga, ipmi, ne2000)
> that need the iomap indirection and also the legacy devices that only
> need port I/O (floppy, x86 platform devices, ...).

Yeah, we probably don`t need the `PortIo` type and can rely on `Io` for
port io. I`ll remove it for the v2.

Best regards
Andrew Ballance