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Message-ID: <0d9fe3d3c52fa618b6c4e1d3414373b2e5417f32.camel@redhat.com>
Date: Tue, 18 Jun 2024 09:56:36 +0200
From: Philipp Stanner <pstanner@...hat.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Hans de Goede
<hdegoede@...hat.com>, Maarten Lankhorst
<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, Bjorn Helgaas <bhelgaas@...gle.com>, Sam
Ravnborg <sam@...nborg.org>, dakr@...hat.com,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org
Subject: Re: [PATCH v9 10/13] PCI: Give pci_intx() its own devres callback
On Mon, 2024-06-17 at 11:46 -0500, Bjorn Helgaas wrote:
> On Mon, Jun 17, 2024 at 10:21:10AM +0200, Philipp Stanner wrote:
> > On Fri, 2024-06-14 at 11:14 -0500, Bjorn Helgaas wrote:
> > > On Fri, Jun 14, 2024 at 10:09:46AM +0200, Philipp Stanner wrote:
> > ...
>
> > > > Apparently INTx is "old IRQ management" and should be done
> > > > through
> > > > pci_alloc_irq_vectors() nowadays.
> > >
> > > Do we have pcim_ support for pci_alloc_irq_vectors()?
> >
> > Nope.
>
> Should we? Or is IRQ support not amenable to devm?
I don't see why it wouldn't work, AFAIU you just register a callback
that deregisters the interrupts again.
This series here, though, stems from me trying to clean up drivers in
DRM. That's when I discovered that regions / IO-mappings (which I need)
are broken.
Adding further stuff to pci/devres.c is no problem at all and
independent from this series; one just has to add the code and call the
appropriate devm_ functions.
>
> Happened to see this new driver:
> https://lore.kernel.org/all/20240617100359.2550541-3-Basavaraj.Natikar@amd.com/
> that uses devm and the only PCI-related part of .remove() is cleaning
> up the IRQs.
>
OK. They also use pcim_iomap_table() and stuff. I think we should
inform about the deprecation.
I don't have a user for IRQ at hand for my DRM work right now. I'd try
to upstream new infrastructure we need there as I did for vboxvideo.
Grüße,
P.
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