linux-kernel - Re: [PATCH 2/5] rust: device: Add a minimal RawDevice trait

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Date:   Sat, 25 Feb 2023 00:45:14 +0900
From:   Asahi Lina <lina@...hilina.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>, Arnd Bergmann <arnd@...db.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Neal Gompa <neal@...pa.dev>, rust-for-linux@...r.kernel.org,
        linux-kernel@...r.kernel.org, asahi@...ts.linux.dev
Subject: Re: [PATCH 2/5] rust: device: Add a minimal RawDevice trait

On 25/02/2023 00.25, Greg Kroah-Hartman wrote:
> On Fri, Feb 24, 2023 at 11:44:59PM +0900, Asahi Lina wrote:
>> On 2023/02/24 23:19, Greg Kroah-Hartman wrote:>> Can we see some users
>> of this code posted so I can see how struct device
>>>> is going to work in a rust driver?  That's the thing I worry most about
>>>> the rust/C interaction here as we have two different ways of thinking
>>>> about reference counts from the two worlds and putting them together is
>>>> going to be "interesting", as can be seen here already.
>>>
>>> Also, where are you getting your 'struct device' from in the first
>>> place?  What bus is createing it and giving it to your rust driver?
>>
>> That would be platform for my GPU driver, matched via OF compatible.
> 
> Ick, a platform device?  The GPU isn't on the PCI bus?  Wow, that's
> horrid...

The internal NVMe controller also isn't on the PCI bus (which is worse
since that actually has standard PCI bindings)... nothing is on PCI
buses other than external PCI/Thunderbolt devices. There are no internal
fake-PCI devices on Apple Silicon like there are on Intel. That's how it
is on most SoCs (though Apple is the only vendor who has dared to go as
far as integrating NVMe as far as I know)...

~~ Lina