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: <55A684E5.8050109@canonical.com>
Date:	Wed, 15 Jul 2015 12:05:57 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Jiang Liu <jiang.liu@...ux.intel.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 07/14/2015 11:17 PM, Jiang Liu wrote:
> 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
Thanks for the analysis and feedback, Gerry.  I'll update the launchpad
bug with your info.

Thanks,

Joe

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