linux-kernel - Re: [PATCH v6 3/6] rust: irq: add support for non-threaded IRQs and handlers

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Message-Id: <DBAZXDRPYWPC.14RI91KYE16RM@kernel.org>
Date: Sun, 13 Jul 2025 16:27:27 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Daniel Almeida" <daniel.almeida@...labora.com>
Cc: "Benno Lossin" <lossin@...nel.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>, "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>, "Thomas Gleixner" <tglx@...utronix.de>, "Bjorn
 Helgaas" <bhelgaas@...gle.com>, Krzysztof Wilczyński
 <kwilczynski@...nel.org>, <linux-kernel@...r.kernel.org>,
 <rust-for-linux@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v6 3/6] rust: irq: add support for non-threaded IRQs and
 handlers

On Sun Jul 13, 2025 at 4:19 PM CEST, Danilo Krummrich wrote:
> On Sun Jul 13, 2025 at 4:09 PM CEST, Daniel Almeida wrote:
>> On a second look, I wonder how useful this will be.
>>
>>  fn handle(&self, dev: &Device<Bound>) -> IrqReturn
>>
>> Sorry for borrowing this terminology, but here we offer Device<Bound>, while I
>> suspect that most drivers will be looking for the most derived Device type
>> instead. So for drm drivers this will be drm::Device, for example, not the base
>> dev::Device type. I assume that this pattern will hold for other subsystems as
>> well.
>>
>> Which brings me to my second point: drivers can store an ARef<drm::Device> on
>> the handler itself, and I assume that the same will be possible in other
>> subsystems.
>
> Well, the whole point is that you can use a &Device<Bound> to directly access
> device resources without any overhead, i.e.
>
> 	fn handle(&self, dev: &Device<Bound>) -> IrqReturn {
> 	   let io = self.iomem.access(dev);
>
> 	   io.write32(...);
> 	}

So, yes, you can store anything in your handler, but the &Device<Bound> is a
cookie for the scope.