linux-kernel - Re: [PATCH v4] acpi, apei, arm64: APEI initial support for aarch64.

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Date:	Tue, 8 Dec 2015 21:08:24 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Tomasz Nowicki <tn@...ihalf.com>,
	Rafael Wysocki <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Marc Zyngier <Marc.Zyngier@....com>, rruigrok@...eaurora.org,
	"Abdulhamid, Harb" <harba@....qualcomm.com>,
	Jon Masters <jcm@...hat.com>, Mark Salter <msalter@...hat.com>,
	Grant Likely <grant.likely@...aro.org>, rrichter@...ium.com,
	jarkko.nikula@...ux.intel.com,
	Jonathan Zhang <jon.zhixiong.zhang@...il.com>
Subject: Re: [PATCH v4] acpi, apei, arm64: APEI initial support for aarch64.

Hi Lorenzo,



On 8 December 2015 at 20:52, Hanjun Guo <hanjun.guo@...aro.org> wrote:
> Hi Lorenzo,
>
> On 12/08/2015 08:34 PM, Lorenzo Pieralisi wrote:
>>
>> On Tue, Dec 08, 2015 at 03:03:03PM +0800, fu.wei@...aro.org wrote:
>>>
>>> From: Tomasz Nowicki <tomasz.nowicki@...aro.org>
>>
>>
>> [...]
>>
>>> +#if defined(__i386__) || defined(__x86_64__)
>>>   /*
>>>    * Check if firmware advertises firmware first mode. We need FF bit to
>>> be set
>>>    * along with a set of MC banks which work in FF mode.
>>>    */
>>>   static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr,
>>> void *data)
>>>   {
>>> -       return arch_apei_enable_cmcff(hest_hdr, data);
>>> +       if (!acpi_disable_cmcff)
>>
>>
>> Why do not you define the flag above in this file (move it out of x86 -
>> that's what I was aiming at in my previous reply) and remove this
>> ifdeffery
>> altogether (First firmware handling could apply to arm64 too according to
>> specs and ACPI on arm64 guidelines) ?
>
>
> If I understand it correctly, CMC (Corrected Machine Check) is for IA32
> only, see section 18.3.2.1 IA-32 Architecture Machine Check Exception
> in ACPI 6.0. for ARM64, we can use other type of error source for
> firmware first handling, such as Generic Hardware Error Source, did
> I miss something?

yes, that is why I try to use "#if defined(__i386__) ||
defined(__x86_64__)" instead of moving acpi_disable_cmcff out of x86
code to here.

And I thinks we also can do "arch_apei_enable_cmcff" -->
"apei_enable_ia_cmcff" because that is IA32 only.

Please correct me if I misunderstand something.  Thanks :-)

Great thanks for your feedback :-)

>
> Thanks
> Hanjun



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
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