linux-kernel - Re: [RFC PATCH 00/11] [RFC] Device / Driver and PCI Rust abstractions

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Date: Mon, 20 May 2024 20:16:19 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Danilo Krummrich <dakr@...hat.com>
Cc: rafael@...nel.org, bhelgaas@...gle.com, ojeda@...nel.org,
	alex.gaynor@...il.com, wedsonaf@...il.com, boqun.feng@...il.com,
	gary@...yguo.net, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me,
	a.hindborg@...sung.com, aliceryhl@...gle.com, airlied@...il.com,
	fujita.tomonori@...il.com, lina@...hilina.net, pstanner@...hat.com,
	ajanulgu@...hat.com, lyude@...hat.com,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [RFC PATCH 00/11] [RFC] Device / Driver and PCI Rust abstractions

On Mon, May 20, 2024 at 08:14:57PM +0200, Greg KH wrote:
> On Mon, May 20, 2024 at 07:25:37PM +0200, Danilo Krummrich wrote:
> > This patch sereis implements basic generic device / driver Rust abstractions,
> > as well as some basic PCI abstractions.
> > 
> > This patch series is sent in the context of [1], and the corresponding patch
> > series [2], which contains some basic DRM Rust abstractions and a stub
> > implementation of the Nova GPU driver.
> > 
> > Nova is intended to be developed upstream, starting out with just a stub driver
> > to lift some initial required infrastructure upstream. A more detailed
> > explanation can be found in [1].
> > 
> > Some patches, which implement the generic device / driver Rust abstractions have
> > been sent a couple of weeks ago already [3]. For those patches the following
> > changes have been made since then:
> > 
> > - remove RawDevice::name()
> > - remove rust helper for dev_name() and dev_get_drvdata()
> > - use AlwaysRefCounted for struct Device
> > - drop trait RawDevice entirely in favor of AsRef and provide
> >   Device::from_raw(), Device::as_raw() and Device::as_ref() instead
> > - implement RevocableGuard
> > - device::Data, remove resources and replace it with a Devres abstraction
> > - implement Devres abstraction for resources

Ah, here's the difference from the last time, sorry, it wasn't obvious.

Still nothing about proper handling and use of 'remove' in the context
of all of this, that's something you really really really need to get
right if you want to attempt to have a driver in rust interact with the
driver core properly.

thanks,

greg k-h