linux-kernel - Re: [PATCH] PCIe AER: honor ACPI HEST FIRMWARE FIRST mode

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Message-ID: <86802c440911041255i59024efckf496dfa966da8560@mail.gmail.com>
Date:	Wed, 4 Nov 2009 12:55:50 -0800
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Matt Domsch <Matt_Domsch@...l.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
	Tom Long Nguyen <tom.l.nguyen@...el.com>,
	Zhang Yanmin <yanmin.zhang@...el.com>,
	linux-kernel@...r.kernel.org,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Huong_Nguyen@...l.com
Subject: Re: [PATCH] PCIe AER: honor ACPI HEST FIRMWARE FIRST mode

On Wed, Nov 4, 2009 at 9:11 AM, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> On Mon, 2 Nov 2009 11:51:24 -0600
> Matt Domsch <Matt_Domsch@...l.com> wrote:
>
>> From 97ec121f91e5c76dc037f8d2abaea84c5476676e Mon Sep 17 00:00:00 2001
>> From: Matt Domsch <Matt_Domsch@...l.com>
>> Date: Thu, 8 Oct 2009 23:18:11 -0500
>> Subject: [PATCH] PCIe AER: honor ACPI HEST FIRMWARE FIRST mode
>>
>> Feedback from Hidetoshi Seto and Kenji Kaneshige incorporated.  This
>> correctly handles PCI-X bridges, PCIe root ports and endpoints, and
>> prints debug messages when invalid/reserved types are found in the
>> HEST.  PCI devices not in domain/segment 0 are not represented in
>> HEST, thus will be ignored.
>>
>> Today, the PCIe Advanced Error Reporting (AER) driver attaches itself
>> to every PCIe root port for which BIOS reports it should, via ACPI
>> _OSC.
>>
>> However, _OSC alone is insufficient for newer BIOSes.  Part of ACPI
>> 4.0 is the new APEI (ACPI Platform Error Interfaces) which is a way
>> for OS and BIOS to handshake over which errors for which components
>> each will handle.  One table in ACPI 4.0 is the Hardware Error Source
>> Table (HEST), where BIOS can define that errors for certain PCIe
>> devices (or all devices), should be handled by BIOS ("Firmware First
>> mode"), rather than be handled by the OS.
>>
>> Dell PowerEdge 11G server BIOS defines Firmware First mode in HEST, so
>> that it may manage such errors, log them to the System Event Log, and
>> possibly take other actions.  The aer driver should honor this, and
>> not attach itself to devices noted as such.
>>
>> Furthermore, Kenji Kaneshige reminded us to disallow changing the AER
>> registers when respecting Firmware First mode.  Platform firmware is
>> expected to manage these, and if changes to them are allowed, it could
>> break that firmware's behavior.
>>
>> The HEST parsing code may be replaced in the future by a more
>> feature-rich implementation.  This patch provides the minimum needed
>> to prevent breakage until that implementation is available.
>>
>> Signed-off-by: Matt Domsch <Matt_Domsch@...l.com>
>> ---
>
> Applied to my linux-next branch, thanks.
>

can not find acpi_hest.c and acpi_hest.h

maybe need to wait acpi hest code is there?

YH
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