linux-kernel - Re: Subject: [v3.19 Regression] x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI

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Message-ID: <55A5D0CC.6020100@linux.intel.com>
Date:	Wed, 15 Jul 2015 11:17:32 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
CC:	konrad.wilk@...cle.com, tony.luck@...el.com, joro@...tes.org,
	Greg KH <gregkh@...uxfoundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>, rdunlap@...radead.org,
	Yinghai Lu <yinghai@...nel.org>, bp@...en8.de,
	len.brown@...el.com, pavel@....cz,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, linux-pm@...r.kernel.org
Subject: Re: Subject:  [v3.19 Regression] x86, irq, acpi: Get rid of special
 handling of GSI for ACPI SCI

On 2015/7/15 1:22, Joseph Salisbury wrote:
> On 07/13/2015 10:42 PM, Jiang Liu wrote:
>> On 2015/7/14 3:36, Joseph Salisbury wrote:
>>> Hello Jiang,
>>>
>>> A kernel bug report was opened against Ubuntu [0]. It was found that
>>> reverting the following commit resolves this bug:
>>>
>>> commit cd68f6bd53cf89d1d5ed889b8af65e9c3574a079
>>> Author: Jiang Liu <jiang.liu@...ux.intel.com>
>>> Date:   Mon Oct 27 16:11:52 2014 +0800
>>>
>>>     x86, irq, acpi: Get rid of special handling of GSI for ACPI SCI
>>>
>>> The regression was introduced as of v3.19-rc1.
>>>     
>>> I was hoping to get your feedback, since you are the patch author.  Do
>>> you think gathering any additional data will help diagnose this issue,
>>> or would it be best to submit a revert request?
>> Hi Joseph,
>> 	Sorry for the trouble. It would be great if we could get
>> more information about the bug, such as bug report info, dmesg and
>> acpidump from the reporting system.
>> Thanks!
>> Gerry
> Comments 3 and 4 have the requested information in the bugzilla bug:
> https://bugzilla.kernel.org/show_bug.cgi?id=101301
> 
> Thanks again for the help!
Hi Joseph,
	According to my investigation, it's an ACPI BIOS issue instead
of a kernel bug. But it's actually a regression. Now we enforce stricter
check for ACPI SCI interrupt, which exposes an implementation flaw in
the virtual BIOS.

I have posted the analysis at
https://bugzilla.kernel.org/show_bug.cgi?id=101301
But I have no account at launchpad, so could you please help to copy
the message to launchpad?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1440072

Thanks!
Gerry
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