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

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Date:	Mon, 21 Dec 2015 23:42:18 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	David Daney <ddaney@...iumnetworks.com>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	Gabriele Paoloni <gabriele.paoloni@...wei.com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"will.deacon@....com" <will.deacon@....com>,
	"okaya@...eaurora.org" <okaya@...eaurora.org>,
	Wangyijing <wangyijing@...wei.com>,
	"Lorenzo.Pieralisi@....com" <Lorenzo.Pieralisi@....com>,
	Tomasz Nowicki <tn@...ihalf.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"robert.richter@...iumnetworks.com" 
	<robert.richter@...iumnetworks.com>,
	"msalter@...hat.com" <msalter@...hat.com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	"Stefano.Stabellini@...citrix.com" <Stefano.Stabellini@...citrix.com>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mw@...ihalf.com" <mw@...ihalf.com>,
	"jchandra@...adcom.com" <jchandra@...adcom.com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"Suravee.Suthikulpanit@....com" <Suravee.Suthikulpanit@....com>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>
Subject: Re: [PATCH V2 22/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks.

On Monday 21 December 2015, David Daney wrote:
> On 12/21/2015 06:10 AM, Arnd Bergmann wrote:
> > On Monday 21 December 2015, Gabriele Paoloni wrote:
> 
> > or require the BIOS to work around the hardware
> > quirks differently (e.g. by trapping config space access through secure
> > firmware, or going through an AML method to be defined).
> 
> Some systems don't seem to have this capability.  For example, in ARMv8 
> (A.K.A. arm64), I haven't been able to figure out how to trap these 
> accesses to EL3 for emulation.  The specification is 5700 pages long 
> though, so perhaps I missed that bit.

How about using AML then? This would be similar to what CHRP used with
RTAS calls to do PCI config space access.

	Arnd
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