From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH V2 22/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks.
Date: Mon, 21 Dec 2015 23:42:18 +0100
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Cc: David Daney <ddaney@caviumnetworks.com>,
        "catalin.marinas@arm.com" <catalin.marinas@arm.com>,
        Gabriele Paoloni <gabriele.paoloni@huawei.com>,
        "linaro-acpi@lists.linaro.org" <linaro-acpi@lists.linaro.org>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "will.deacon@arm.com" <will.deacon@arm.com>,
        "okaya@codeaurora.org" <okaya@codeaurora.org>,
        Wangyijing <wangyijing@huawei.com>,
        "Lorenzo.Pieralisi@arm.com" <Lorenzo.Pieralisi@arm.com>,
        Tomasz Nowicki <tn@semihalf.com>,
        "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
        "robert.richter@caviumnetworks.com" 
	<robert.richter@caviumnetworks.com>,
        "msalter@redhat.com" <msalter@redhat.com>,
        "jcm@redhat.com" <jcm@redhat.com>,
        "Stefano.Stabellini@eu.citrix.com" <Stefano.Stabellini@eu.citrix.com>,
        "Liviu.Dudau@arm.com" <Liviu.Dudau@arm.com>,
        "bhelgaas@google.com" <bhelgaas@google.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "mw@semihalf.com" <mw@semihalf.com>,
        "jchandra@broadcom.com" <jchandra@broadcom.com>,
        "rjw@rjwysocki.net" <rjw@rjwysocki.net>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "hanjun.guo@linaro.org" <hanjun.guo@linaro.org>,
        "Suravee.Suthikulpanit@amd.com" <Suravee.Suthikulpanit@amd.com>,
        "jiang.liu@linux.intel.com" <jiang.liu@linux.intel.com>
References: <1450278993-12664-1-git-send-email-tn@semihalf.com> <201512211510.32029.arnd@arndb.de> <5678370B.1030102@caviumnetworks.com>
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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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