linux-kernel - Re: [PATCH 0/2] PCI/AER: Consistently use

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Date:   Tue, 20 Nov 2018 22:36:26 +0000
From:   <Alex_Gagniuc@...lteam.com>
To:     <okaya@...nel.org>, <mr.nuke.me@...il.com>, <keith.busch@...el.com>
Cc:     <baicar.tyler@...il.com>, <Austin.Bolen@...l.com>,
        <Shyam.Iyer@...l.com>, <lukas@...ner.de>, <bhelgaas@...gle.com>,
        <rjw@...ysocki.net>, <lenb@...nel.org>, <ruscur@...sell.cc>,
        <sbobroff@...ux.ibm.com>, <oohall@...il.com>,
        <linux-pci@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 0/2] PCI/AER: Consistently use _OSC to determine who owns
 AER

On 11/20/2018 04:08 PM, Sinan Kaya wrote:
> One version is:
> "if HEST table is present, ignore _OSC"
> or
> Another version is:
> "if HEST table is present, make sure that FW sets _OSC bit for AER to
> false. Otherwise, warn like crazy that this BIOS is broken and needs
> an update and can cause all sorts of trouble"

ACPI 6.2 Ch 6.2.11.3, Table 6-197
	PCI Express Advanced Error Reporting control

	The firmware sets this bit to 1 to grant control over PCI
	Express Advanced Error Reporting.
	If firmware allows the OS control of this feature, then in the
	context of the _OSC method it must ensure that error messages
	are routed to device interrupts as described in the PCI
	Express Base Specification. Additionally, after control is
	transferred to the OS, firmware must not modify the Advanced
	Error Reporting Capability. If control of this feature was
	requested and denied or was not requested, firmware returns
	this bit set to 0.