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From: alyssa@rosenzweig.io
Message-ID: <96e9949bf7210225515ed48911627743@rosenzweig.io>
Subject: Re: [PATCH 2/5] rust: device: Add a minimal RawDevice trait
To: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Asahi Lina"
 <lina@asahilina.net>
Cc: "Miguel Ojeda" <ojeda@kernel.org>, "Alex Gaynor"
 <alex.gaynor@gmail.com>, "Wedson Almeida Filho" <wedsonaf@gmail.com>,
 "Boqun Feng" <boqun.feng@gmail.com>, "Gary Guo" <gary@garyguo.net>,
 "=?utf-8?B?QmrDtnJuIFJveSBCYXJvbg==?=" <bjorn3_gh@protonmail.com>, "Will
 Deacon" <will@kernel.org>, "Robin Murphy" <robin.murphy@arm.com>, "Joerg
 Roedel" <joro@8bytes.org>, "Hector Martin" <marcan@marcan.st>, "Sven
 Peter" <sven@svenpeter.dev>, "Arnd Bergmann" <arnd@arndb.de>, "Rafael J.
 Wysocki" <rafael@kernel.org>, "Neal Gompa" <neal@gompa.dev>,
 rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
 asahi@lists.linux.dev
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References: <Y/jW161RuT7OtlSf@kroah.com>
 <20230224-rust-iopt-rtkit-v1-0-49ced3391295@asahilina.net>
 <20230224-rust-iopt-rtkit-v1-2-49ced3391295@asahilina.net>
 <Y/ieQ0UX/niAG1Hg@kroah.com>
 <ef3a3638-6381-87ab-d674-644306b6b6ce@asahilina.net>
 <Y/jFeZzZVCpBGvGv@kroah.com> <Y/jHeP4LileLYxO8@kroah.com>
 <bbc824ee-ef4e-40cb-f009-0d693d757869@asahilina.net>
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February 24, 2023 10:25 AM, "Greg Kroah-Hartman" <gregkh@linuxfoundation.=
org> wrote:=0A=0A> On Fri, Feb 24, 2023 at 11:44:59PM +0900, Asahi Lina w=
rote:=0A> =0A>> On 2023/02/24 23:19, Greg Kroah-Hartman wrote:>> Can we s=
ee some users=0A>> of this code posted so I can see how struct device=0A>=
> is going to work in a rust driver? That's the thing I worry most about=
=0A>> the rust/C interaction here as we have two different ways of thinki=
ng=0A>> about reference counts from the two worlds and putting them toget=
her is=0A>> going to be "interesting", as can be seen here already.=0A>> =
=0A>> Also, where are you getting your 'struct device' from in the first=
=0A>> place? What bus is createing it and giving it to your rust driver?=
=0A>> =0A>> That would be platform for my GPU driver, matched via OF comp=
atible.=0A> =0A> Ick, a platform device? The GPU isn't on the PCI bus? Wo=
w, that's=0A> horrid...=0A=0AThis is bog standard for Arm SoCs... As far =
as I know, it's all platform devices in the Arm GPU world: Mali, Adreno, =
Tegra, VideoCore, and yes, Imaginapple. not really sure what good PCI wou=
ld do for integrated GPUs.