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

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Message-ID: <bdfd5c582e7b858d3f32428000d2268228beef5f.camel@redhat.com>
Date: Mon, 17 Jun 2024 10:21:10 +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 Fri, 2024-06-14 at 11:14 -0500, Bjorn Helgaas wrote:
> 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 As pci_intx() is an outdated function, pcim_intx() shall not be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 What makes pci_intx() outdated?  If it's outdated, we should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()?

Nope.

All PCI devres functions that exist are now in pci/devres.c, except for
the hybrid functions (pci_intx() and everything calling
__pci_request_region()) in pci.c


P.

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