linux-kernel - Re: [PATCH v3] acpi, apei, arm64: APEI initial support for aarch64.

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Date:	Mon, 7 Dec 2015 15:27:35 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	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>,
	Jonathan Zhang <jon.zhixiong.zhang@...il.com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Tomasz Nowicki <tn@...ihalf.com>,
	Rafael Wysocki <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, jarkko.nikula@...ux.intel.com
Cc:	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Jon Masters <jcm@...hat.com>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Mark Salter <msalter@...hat.com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Grant Likely <grant.likely@...aro.org>, rrichter@...ium.com,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	rruigrok@...eaurora.org,
	"Abdulhamid, Harb" <harba@....qualcomm.com>,
	Fu Wei <fu.wei@...aro.org>
Subject: Re: [PATCH v3] acpi, apei, arm64: APEI initial support for aarch64.

Hi all,

On 4 December 2015 at 01:15,  <fu.wei@...aro.org> wrote:
> From: Tomasz Nowicki <tomasz.nowicki@...aro.org>
>
> This commit provides APEI arch-specific bits for aarch64
>
> The reason for wrapping "acpi_disable_cmcff" by
> "#if defined(__i386__) || defined(__x86_64__)" in hest.c is:
> according to ACPI spec CMC(Corrected Machine Check) is only for IA-32
> Architecture.
>
> Changelog:
> v3: Remove "acpi_disable_cmcff" from arm64 code,
>     and wrap it in hest.c by "#if defined(__i386__) || defined(__x86_64__)"
>
> v2: https://lkml.org/lkml/2015/12/2/432
>     Rebase to latest kernel version(4.4-rc3).
>     Move arch_apei_flush_tlb_one() to arch/arm64/kernel/acpi.c
>
> v1: https://lkml.org/lkml/2015/8/14/199
>     Move arch_apei_flush_tlb_one() to arch/arm64/include/asm/apci.h.
>     Delete arch/arm64/kernel/apei.c.
>     Add "#ifdef CONFIG_ACPI_APEI" for "acpi_disable_cmcff".
>
> 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>
> ---
>  arch/arm64/Kconfig            | 1 +
>  arch/arm64/include/asm/acpi.h | 1 +
>  arch/arm64/kernel/acpi.c      | 6 ++++++
>  drivers/acpi/apei/hest.c      | 2 ++
>  4 files changed, 10 insertions(+)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 871f217..58c8992 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -3,6 +3,7 @@ config ARM64
>         select ACPI_CCA_REQUIRED if ACPI
>         select ACPI_GENERIC_GSI if ACPI
>         select ACPI_REDUCED_HARDWARE_ONLY if ACPI
> +       select HAVE_ACPI_APEI if ACPI
>         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
>         select ARCH_HAS_ELF_RANDOMIZE
>         select ARCH_HAS_GCOV_PROFILE_ALL
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index caafd63..7207f8e 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -94,6 +94,7 @@ static inline const char *acpi_get_enable_method(int cpu)
>
>  #ifdef CONFIG_ACPI_APEI
>  pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
> +void arch_apei_flush_tlb_one(unsigned long addr);
>  #endif
>
>  #endif /*_ASM_ACPI_H*/
> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
> index d1ce8e2..7a742e7 100644
> --- a/arch/arm64/kernel/acpi.c
> +++ b/arch/arm64/kernel/acpi.c
> @@ -32,6 +32,7 @@
>  #ifdef CONFIG_ACPI_APEI
>  # include <linux/efi.h>
>  # include <asm/pgtable.h>
> +# include <asm/tlbflush.h>
>  #endif
>
>  int acpi_noirq = 1;            /* skip ACPI IRQ initialization */
> @@ -233,4 +234,9 @@ pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
>                 return __pgprot(PROT_NORMAL_NC);
>         return __pgprot(PROT_DEVICE_nGnRnE);
>  }
> +
> +void arch_apei_flush_tlb_one(unsigned long addr)
> +{
> +       flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
> +}
>  #endif
> diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
> index 20b3fcf..4ead747 100644
> --- a/drivers/acpi/apei/hest.c
> +++ b/drivers/acpi/apei/hest.c
> @@ -232,8 +232,10 @@ void __init acpi_hest_init(void)
>                 goto err;
>         }
>
> +#if defined(__i386__) || defined(__x86_64__)
>         if (!acpi_disable_cmcff)
>                 apei_hest_parse(hest_parse_cmc, NULL);
> +#endif

Another thought is moving acpi_disable_cmcff to drivers/acpi/apei/hest.c
I am not sure which one is best, but AFAIK CMC(Corrected Machine Check)
is only for IA-32 Architecture, so I thinks we can comment out this code
in other architectures, even with "hest_parse_cmc".

Any suggestion?

>
>         if (!ghes_disable) {
>                 rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
> --
> 2.5.0
>



-- 
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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