linux-kernel - RE: [PATCH V2 22/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks.

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Message-ID: <EE11001F9E5DDD47B7634E2F8A612F2E1EC18865@lhreml503-mbb>
Date:	Tue, 22 Dec 2015 17:49:47 +0000
From:	Gabriele Paoloni <gabriele.paoloni@...wei.com>
To:	Jon Masters <jcm@...hat.com>, Arnd Bergmann <arnd@...db.de>
CC:	Tomasz Nowicki <tn@...ihalf.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"will.deacon@....com" <will.deacon@....com>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"Lorenzo.Pieralisi@....com" <Lorenzo.Pieralisi@....com>,
	"okaya@...eaurora.org" <okaya@...eaurora.org>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"Stefano.Stabellini@...citrix.com" <Stefano.Stabellini@...citrix.com>,
	"robert.richter@...iumnetworks.com" 
	<robert.richter@...iumnetworks.com>,
	"mw@...ihalf.com" <mw@...ihalf.com>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....com>,
	"ddaney@...iumnetworks.com" <ddaney@...iumnetworks.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	Wangyijing <wangyijing@...wei.com>,
	"Suravee.Suthikulpanit@....com" <Suravee.Suthikulpanit@....com>,
	"msalter@...hat.com" <msalter@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"jchandra@...adcom.com" <jchandra@...adcom.com>
Subject: RE: [PATCH V2 22/23] pci, acpi: Match PCI config space accessors
 against platfrom specific quirks.


> -----Original Message-----
> From: Jon Masters [mailto:jcm@...hat.com]
> Sent: 22 December 2015 16:45
> To: Gabriele Paoloni; Arnd Bergmann
> Cc: Tomasz Nowicki; bhelgaas@...gle.com; will.deacon@....com;
> catalin.marinas@....com; rjw@...ysocki.net; hanjun.guo@...aro.org;
> Lorenzo.Pieralisi@....com; okaya@...eaurora.org;
> jiang.liu@...ux.intel.com; Stefano.Stabellini@...citrix.com;
> robert.richter@...iumnetworks.com; mw@...ihalf.com; Liviu.Dudau@....com;
> ddaney@...iumnetworks.com; tglx@...utronix.de; Wangyijing;
> Suravee.Suthikulpanit@....com; msalter@...hat.com; linux-
> pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> acpi@...r.kernel.org; linux-kernel@...r.kernel.org; linaro-
> acpi@...ts.linaro.org; jchandra@...adcom.com
> Subject: Re: [PATCH V2 22/23] pci, acpi: Match PCI config space
> accessors against platfrom specific quirks.
> 
> On 12/22/2015 11:36 AM, Jon Masters wrote:
> > On 12/22/2015 04:29 AM, Gabriele Paoloni wrote:
> >> Hi Jon, thanks for replying
> >>
> >>> -----Original Message-----
> >>> From: Jon Masters [mailto:jcm@...hat.com]
> >>> Sent: 21 December 2015 23:11
> >>> To: Arnd Bergmann
> >>> Cc: Gabriele Paoloni; Tomasz Nowicki; bhelgaas@...gle.com;
> >>> will.deacon@....com; catalin.marinas@....com; rjw@...ysocki.net;
> >>> hanjun.guo@...aro.org; Lorenzo.Pieralisi@....com;
> >>> okaya@...eaurora.org; jiang.liu@...ux.intel.com;
> >>> Stefano.Stabellini@...citrix.com; robert.richter@...iumnetworks.com;
> >>> mw@...ihalf.com; Liviu.Dudau@....com; ddaney@...iumnetworks.com;
> >>> tglx@...utronix.de; Wangyijing; Suravee.Suthikulpanit@....com;
> >>> msalter@...hat.com; linux- pci@...r.kernel.org;
> >>> linux-arm-kernel@...ts.infradead.org; linux- acpi@...r.kernel.org;
> >>> linux-kernel@...r.kernel.org; linaro- acpi@...ts.linaro.org;
> >>> jchandra@...adcom.com
> >>> Subject: Re: [PATCH V2 22/23] pci, acpi: Match PCI config space
> >>> accessors against platfrom specific quirks.
> >>>
> >>> Sorry for top-posting. A quick note that SMBIOS3 is required by
> SBBR
> >>> so it can be presumed that compliant platforms will provide quirks
> via DMI.
> >>
> >> Ok so you completely clarified my question 1). Many Thanks for this
> >
> > No problem. One of the (many) reasons I pushed for requiring
> > SMBIOS/DMI in SBBR (I was lead author of one of the early drafts of
> > that document) was to make the experience ultimately equivalent
> across architectures.
> > We already know how to do quirks and handle platform deviations, and
> > the major Operating System vendors did not want to reinvent the wheel.
> 
> Additional: it is clear that more prescription is required to get the
> vendors onto the bandwagon that we have with other architectures (e.g.
> that other one). So there will be a Red Hat "ARM server whitepaper"
> coming in the early new year that will include the kind of "server 101"
> material we want to make sure people know. Things like making sure you
> implement and test PCIe correctly, handle backward compatibility (you
> will build hardware in the future that runs my existing OS release),
> design the hardware to allow for workarounds later, etc. I expect some
> other Operating System vendors to be involved in reviewing that.
> 
> Ultimately my objective is to make this whole thing dull and boring.
> You will get RHEL(SA)/upstream kernels and it will either boot or it
> will not. If it does not boot, vendor X screwed up their hardware. We
> know this story, it's been this way for over a decade already, and that
> is exactly how it is going to be with ARM servers shortly.

Ok got it.

Many Thanks

Gab

> 
> Jon.

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