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Date: Mon, 21 Dec 2015 18:10:58 -0500 (EST) From: Jon Masters <jcm@...hat.com> To: Arnd Bergmann <arnd@...db.de> Cc: Gabriele Paoloni <gabriele.paoloni@...wei.com>, 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. 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. -- Computer Architect | Sent from my 64-bit #ARM Powered phone > On Dec 21, 2015, at 09:11, Arnd Bergmann <arnd@...db.de> wrote: > > On Monday 21 December 2015, Gabriele Paoloni wrote: >>> -----Original Message----- >>> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel- >>> owner@...r.kernel.org] On Behalf Of Tomasz Nowicki > >>> Some platforms may not be fully compliant with generic set of PCI >>> config accessors. For these cases we implement the way to overwrite >>> accessors set before PCI buses enumeration. Algorithm that overwrite >>> accessors matches against platform ID (DMI), domain and bus number, >>> hopefully enough for all cases. All quirks can be defined using: >>> DECLARE_ACPI_MCFG_FIXUP() and keep self contained. >> >> I've got a couple of comments/questions about this patch.. >> >> 1) So according to this mechanism quirks would be supported only by >> vendors whose BIOS are SMBIOS compliant. Now personally I am ok >> with this but I don't know if this is OK in general as it would >> narrow down the number of platforms that would be able to define >> the quirks... >> Lorenzo, Arnd what is your opinion here? > > I'd rather not see the quirks in mainline at all, and only support > SBSA compliant machines, 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). I'm certainly > ok with making it depend on SMBIOS if we are going to use something like this. > > Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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