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

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Date:	Tue, 8 Dec 2015 14:07:20 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Fu Wei <fu.wei@...aro.org>
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.

On Tue, Dec 08, 2015 at 09:08:24PM +0800, Fu Wei wrote:
> 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 :-)

No you are right, I was confused by the arch_apei_enable_cmcff __weak
function declaration, I am not sure that makes much sense, as you say.

Side note: I wonder if there is a way to make the TLB flushing API common
across architectures therefore avoiding this arch_apei_flush_tlb* churn.

Thanks,
Lorenzo

> 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,
> Shanghai,China 200021
> 
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