linux-kernel - Re: [PATCH v12] acpi, apei, arm64: APEI initial support for aarch64.

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Message-ID: <20160804103028.GA8152@nazgul.tnic>
Date:	Thu, 4 Aug 2016 12:30:28 +0200
From:	Borislav Petkov <bp@...e.de>
To:	fu.wei@...aro.org
Cc:	tn@...ihalf.com, rjw@...ysocki.net, len.brown@...el.com,
	pavel@....cz, hanjun.guo@...aro.org, jon.zhixiong.zhang@...il.com,
	jcm@...hat.com, catalin.marinas@....com, will.deacon@....com,
	mark.rutland@....com, Marc.Zyngier@....com,
	lorenzo.pieralisi@....com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, matt.fleming@...el.com, tony.luck@...el.com,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	x86@...nel.org, linaro-acpi@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v12] acpi, apei, arm64: APEI initial support for aarch64.

Tomasz's linaro address bounces, adding one I've found on lkml to CC
instead.

On Thu, Aug 04, 2016 at 11:48:38AM +0200, Borislav Petkov wrote:
> On Fri, Jul 29, 2016 at 04:57:44PM +0800, fu.wei@...aro.org wrote:
> > From: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> > 
> > This commit provides APEI arch-specific bits for aarch64
> > 
> > Meanwhile,
> > (1)add a new subfunction "hest_ia32_init" for
> > "acpi_disable_cmcff" which is used by IA-32 Architecture
> > Corrected Machine Check (CMC).
> > (2)move HEST type (ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) checking to
> > a generic place.
> > (3)select HAVE_ACPI_APEI when EFI and ACPI is set on ARM64,
> > because arch_apei_get_mem_attribute is using efi_mem_attributes on ARM64.
> > 
> > [Fu Wei: improve && upstream]
> > 
> > Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> > Tested-by: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org>
> > Signed-off-by: Fu Wei <fu.wei@...aro.org>
> > Acked-by: Hanjun Guo <hanjun.guo@...aro.org>
> > Tested-by: Tyler Baicar <tbaicar@...eaurora.org>
> > Acked-by: Will Deacon <will.deacon@....com>
> > ---
> 
> ...
> 
> > @@ -110,8 +111,21 @@ static inline const char *acpi_get_enable_method(int cpu)
> >  }
> >  
> >  #ifdef	CONFIG_ACPI_APEI
> > +#define acpi_disable_cmcff 1
> 
> What does that mean? ARM doesn't have firmware-first mode?
> 
> A piece of comment please.
> 
> >  pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
> > -#endif
> > +
> > +/*
> > + * Despite its name, this function must still broadcast the TLB
> > + * invalidation in order to ensure other CPUs don't up with junk
> 						      ^
> 						     end
> 
> > + * entries as a result of speculation. Unusually, its also called in
> > + * IRQ context (ghes_iounmap_irq) so if we ever need to use IPIs for
> > + * TLB broadcasting, then we're in trouble here.
> > + */
> > +static inline void arch_apei_flush_tlb_one(unsigned long addr)
> > +{
> > +	flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
> > +}
> > +#endif /* CONFIG_ACPI_APEI */
> >  
> >  #ifdef CONFIG_ACPI_NUMA
> >  int arm64_acpi_numa_init(void);
> > diff --git a/arch/x86/kernel/acpi/apei.c b/arch/x86/kernel/acpi/apei.c
> > index c280df6..ea3046e 100644
> > --- a/arch/x86/kernel/acpi/apei.c
> > +++ b/arch/x86/kernel/acpi/apei.c
> 
> ...
> 
> > diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
> > index 20b3fcf..792a0d9 100644
> > --- a/drivers/acpi/apei/hest.c
> > +++ b/drivers/acpi/apei/hest.c
> > @@ -232,8 +243,9 @@ void __init acpi_hest_init(void)
> >  		goto err;
> >  	}
> >  
> > -	if (!acpi_disable_cmcff)
> > -		apei_hest_parse(hest_parse_cmc, NULL);
> > +	rc = hest_ia32_init();
> 
> Why do you need a separate hest_ia32_init() here?
> 
> You can do
> 
> 	rc = apei_hest_parse(hest_parse_cmc, NULL);
> 
> directly here AFAICT.
> 
> > +	if (rc)
> > +		goto err;
> >  
> >  	if (!ghes_disable) {
> >  		rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
> > -- 
> > 2.5.5
> > 

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.

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