linux-kernel - Re: [PATCH v2 2/5] x86/PCI: Support additional MMIO range capabilities

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Message-Id: <3CFA7164-1352-467D-951E-C9F8F35F3163@numascale.com>
Date:	Tue, 29 Apr 2014 06:07:46 -0700
From:	Steffen Persvold <sp@...ascale.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Robert Richter <rric@...nel.org>,
	Myron Stowe <myron.stowe@...il.com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Aravind Gopalakrishnan <aravind.gopalakrishnan@....com>,
	linux-pci <linux-pci@...r.kernel.org>, kim.naru@....com,
	Daniel J Blueman <daniel@...ascale.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86 <x86@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jan Beulich <JBeulich@...e.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v2 2/5] x86/PCI: Support additional MMIO range capabilities

On 29 Apr 2014, at 3:20 , Borislav Petkov <bp@...e.de> wrote:

> On Tue, Apr 29, 2014 at 09:33:09AM +0200, Andreas Herrmann wrote:
>> I am sure, it's because some server systems had MMIO ECS access not
>> enabled in BIOS. I can't remember which systems were affected.
> 
> Ok, now AMD people: what's the story with IO ECS, can we assume that on
> everything after F10h, BIOS has a sensible MCFG and we can limit this to
> F10h only? I like Bjorn's idea but we need to make sure a working MCFG
> is ubiquitous.
> 
> Which begs the real question: Suravee, why are you even touching IO ECS
> provided F15h and later have a MCFG? Or, do they?
> 

Our experience with this is that Fam10h and later have a very well working MCFG setup, earlier generations not so much (hence IO ECS was needed).

Cheers,
Steffen

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