linux-kernel - Re: [PATCH v9 10/13] PCI: Give pci

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Date: Fri, 14 Jun 2024 11:14:43 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Philipp Stanner <pstanner@...hat.com>
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 Fri, Jun 14, 2024 at 10:09:46AM +0200, Philipp Stanner wrote:
> On Thu, 2024-06-13 at 16:06 -0500, Bjorn Helgaas wrote:
> > On Thu, Jun 13, 2024 at 01:50:23PM +0200, Philipp Stanner wrote:
> > > pci_intx() is one of the functions that have "hybrid mode" (i.e.,
> > > sometimes managed, sometimes not). Providing a separate pcim_intx()
> > > function with its own device resource and cleanup callback allows
> > > for
> > > removing further large parts of the legacy PCI devres
> > > implementation.
> > > 
> > > As in the region-request-functions, pci_intx() has to call into its
> > > managed counterpart for backwards compatibility.
> > > 
> > > As pci_intx() is an outdated function, pcim_intx() shall not be
> > > made
> > > visible to drivers via a public API.
> > 
> > What makes pci_intx() outdated?  If it's outdated, we should mention
> > why and what the 30+ callers (including a couple in drivers/pci/)
> > should use instead.
> 
> That is 100% based on Andy Shevchenko's (+CC) statement back from
> January 2024 a.D. [1]
> 
> 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()?

> [1] https://lore.kernel.org/all/ZabyY3csP0y-p7lb@surfacebook.localdomain/