linux-kernel - Re: [PATCH v7 06/17] ARM64 / ACPI: Make PCI optional for ACPI on ARM64

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Date:	Sun, 18 Jan 2015 07:32:23 -0500
From:	Jon Masters <jcm@...hat.com>
To:	Graeme Gregory <gg@...mlogic.co.uk>,
	Hanjun Guo <hanjun.guo@...aro.org>
CC:	Mark Rutland <Mark.Rutland@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	"wangyijing@...wei.com" <wangyijing@...wei.com>,
	Rob Herring <robh@...nel.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Timur Tabi <timur@...eaurora.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"phoenix.liyi@...wei.com" <phoenix.liyi@...wei.com>,
	Robert Richter <rric@...nel.org>,
	Jason Cooper <jason@...edaemon.net>,
	Arnd Bergmann <arnd@...db.de>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Mark Brown <broonie@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v7 06/17] ARM64 / ACPI: Make PCI optional for ACPI on
 ARM64

On 01/18/2015 04:29 AM, Graeme Gregory wrote:
> On Sun, Jan 18, 2015 at 02:46:35PM +0800, Hanjun Guo wrote:
>> On 2015年01月18日 14:31, Jon Masters wrote:
>>> Hi Folks,
>>>
>>> Sorry for top posting from bed. The mainstream servers will all likely do
>>> PCIe but there are several that may not. They should not be excluded. That
>> said,
>>> if we booted a previously built kernel on a system without an MCFG and
>>> got no ECAM/root then things would probably still work.
>>>
>>> I think it'll work out either way but for the record there is no requirement to do PCIe on ARM servers that conform to spec.
>>
>> OK, Catalin already said that was not the main point of the
>> comments for this patch, I think the title and change log
>> of the patch is inconsistent with the code makes Catalin confused,
>> I will update them in next version.
>>
> Well what we are talking about is the presence of CONFIG_PCI=y which even
> in Jons case will be true as he wants to run the same kernel on both
> sets of hardware.

Yup. And btw, the ACPI+PCI use case works beautifully already today. I
will followup to my other Tested-by with a bit more detail later, but
these patches have successfully been used on a wide range of PCIe based
hardware already (I personally have tried a number of 10G network cards,
SATA, USB, and even a graphics card or two for giggles).

Jon.

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