linux-kernel - Re: [PATCH v2 0/7] PCI: Solve two bridge window sizing issues

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Date: Fri, 29 Dec 2023 14:24:29 +0200
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Igor Mammedov <imammedo@...hat.com>, Lukas Wunner <lukas@...ner.de>,
	Andy Shevchenko <andriy.shevchenko@...el.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/7] PCI: Solve two bridge window sizing issues

Hi Ilpo,

On Thu, Dec 28, 2023 at 06:57:00PM +0200, Ilpo Järvinen wrote:
> Hi all,
> 
> Here's a series that contains two fixes to PCI bridge window sizing
> algorithm. Together, they should enable remove & rescan cycle to work
> for a PCI bus that has PCI devices with optional resources and/or
> disparity in BAR sizes.
> 
> For the second fix, I chose to expose find_empty_resource_slot() from
> kernel/resource.c because it should increase accuracy of the cannot-fit
> decision (currently that function is called find_resource()). In order
> to do that sensibly, a few improvements seemed in order to make its
> interface and name of the function sane before exposing it. Thus, the
> few extra patches on resource side.
> 
> Unfortunately I don't have a reason to suspect these would help with
> the issues related to the currently ongoing resource regression
> thread [1].
> 
> [1] https://lore.kernel.org/linux-pci/ZXpaNCLiDM+Kv38H@marvin.atrad.com.au/
> 
> v2:
> - Add "typedef" to kerneldoc to get correct formatting
> - Use RESOURCE_SIZE_MAX instead of literal
> - Remove unnecessary checks for io{port/mem}_resource
> - Apply a few style tweaks from Andy
> 
> Ilpo Järvinen (7):
>   PCI: Fix resource double counting on remove & rescan
>   resource: Rename find_resource() to find_empty_resource_slot()
>   resource: Document find_empty_resource_slot() and resource_constraint
>   resource: Use typedef for alignf callback
>   resource: Handle simple alignment inside __find_empty_resource_slot()
>   resource: Export find_empty_resource_slot()
>   PCI: Relax bridge window tail sizing rules

Thanks for doing this! :)

All look good to me,

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>