linux-kernel - Re: [PATCH v6 04/10] PCI: Make devres region requests consistent

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Date: Fri, 26 Apr 2024 09:45:04 +0200
From: Philipp Stanner <pstanner@...hat.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: 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 v6 04/10] PCI: Make devres region requests consistent

On Wed, 2024-04-24 at 15:12 -0500, Bjorn Helgaas wrote:
> On Mon, Apr 08, 2024 at 10:44:16AM +0200, Philipp Stanner wrote:
> > Now that pure managed region request functions are available, the
> > implementation of the hybrid-functions which are only sometimes
> > managed
> > can be made more consistent and readable by wrapping those
> > always-managed functions.
> > 
> > Implement a new pcim_ function for exclusively requested regions.
> > Have the pci_request / release functions call their pcim_
> > counterparts.
> > Remove the now surplus region_mask from struct pci_devres.
> 
> This looks like two patches; could they be separated?
> 
>   - Convert __pci_request_region() etc to the new pcim model
> 
>   - Add pcim_request_region_exclusive()
> 
> IORESOURCE_EXCLUSIVE was added by e8de1481fd71 ("resource: allow MMIO
> exclusivity for device drivers") in 2008 to help debug an e1000e
> problem.  In the 16 years since, there's only been one new PCI-
> related
> use (ne_pci_probe()), and we don't add a user of
> pcim_request_region_exclusive() in this series, so I would defer it
> until somebody wants it.

Alright, sounds reasonable to me.
Since pcim_request_region_exclusive() can be dropped we can also omit
separating this patch to begin with I'd say.

P.


> 
> Bjorn
>