linux-kernel - Re: [RFC PATCH 0/3] gpu: nova-core: add basic timer subdevice implementation

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Message-ID: <CAPM=9txOK4_uVvmb4bWirBVPNsPoPTiF0NMK_FJTd1NuY0Y5xg@mail.gmail.com>
Date: Fri, 28 Feb 2025 14:10:39 +1000
From: Dave Airlie <airlied@...il.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: Greg KH <gregkh@...uxfoundation.org>, Jason Gunthorpe <jgg@...dia.com>, 
	Danilo Krummrich <dakr@...nel.org>, Joel Fernandes <joelagnelf@...dia.com>, 
	Alexandre Courbot <acourbot@...dia.com>, Gary Guo <gary@...yguo.net>, 
	Joel Fernandes <joel@...lfernandes.org>, Boqun Feng <boqun.feng@...il.com>, 
	Ben Skeggs <bskeggs@...dia.com>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, nouveau@...ts.freedesktop.org, 
	dri-devel@...ts.freedesktop.org, paulmck@...nel.org
Subject: Re: [RFC PATCH 0/3] gpu: nova-core: add basic timer subdevice implementation

On Fri, 28 Feb 2025 at 09:07, John Hubbard <jhubbard@...dia.com> wrote:
>
> On Thu Feb 27, 2025 at 1:42 PM PST, Dave Airlie wrote:
> > On Thu, 27 Feb 2025 at 11:34, John Hubbard <jhubbard@...dia.com> wrote:
> >> On Wed Feb 26, 2025 at 5:02 PM PST, Greg KH wrote:
> >> > On Wed, Feb 26, 2025 at 07:47:30PM -0400, Jason Gunthorpe wrote:
> ...
> > nova is just a drm driver, it's not a rewrite of the drm subsystem,
> > that sort of effort would entail a much larger commitment.
>
> Maybe at this point in the discussion it would help to discern between
> nova-core and nova-drm:
>
>     drivers/gpu/nova-core/ (under discussion here)

nova-core won't be suffering any of the issues Jason is raising,
nova-core isn't going to have userspace facing interfaces or be part
of any subsystem with major lifetime expectations. It has to deal with
the hardware going away due to hot unplugs, and that is what this
devres is for.

nova-core will be a kernel internal pci driver, and vfio and nova-drm
will load on top of it, once those drivers are loaded and talking to
userspace they will keep references on the nova-core driver module
through normal means.

Dave.