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

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Date:	Mon, 17 Aug 2015 11:01:09 +0100
From:	Will Deacon <will.deacon@....com>
To:	"fu.wei@...aro.org" <fu.wei@...aro.org>
Cc:	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"zjzhang@...eaurora.org" <zjzhang@...eaurora.org>,
	"matt.fleming@...el.com" <matt.fleming@...el.com>,
	"tekkamanninja@...il.com" <tekkamanninja@...il.com>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	"al.stone@...aro.org" <al.stone@...aro.org>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"jcm@...hat.com" <jcm@...hat.com>,
	Mark Rutland <Mark.Rutland@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"bp@...en8.de" <bp@...en8.de>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Subject: Re: [PATCH] acpi, apei, arm64: APEI initial support for aarch64.

On Fri, Aug 14, 2015 at 01:35:53PM +0100, fu.wei@...aro.org wrote:
> From: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> 
> This commit provides APEI arch-specific bits for aarch64
> 
> Changelog:
>   Fu Wei:
>     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>
> Signed-off-by: Fu Wei <fu.wei@...aro.org>
> ---
>  arch/arm64/Kconfig            |  1 +
>  arch/arm64/include/asm/acpi.h | 11 +++++++++++
>  arch/arm64/kernel/acpi.c      |  4 ++++
>  3 files changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 318175f..6144c9d 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 a17b623..ced6e25 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -22,6 +22,7 @@
>  #ifdef CONFIG_ACPI_APEI
>  #include <linux/efi.h>
>  #include <asm/pgtable.h>
> +#include <asm/tlbflush.h>
>  #endif
>  
>  /* Macros for consistency checks of the GICC subtable of MADT */
> @@ -52,6 +53,9 @@ typedef u64 phys_cpuid_t;
>  extern int acpi_disabled;
>  extern int acpi_noirq;
>  extern int acpi_pci_disabled;
> +#ifdef CONFIG_ACPI_APEI
> +extern int acpi_disable_cmcff;
> +#endif
>  
>  static inline void disable_acpi(void)
>  {
> @@ -89,6 +93,13 @@ static inline bool acpi_has_cpu_in_madt(void)
>  static inline void arch_fix_phys_package_id(int num, u32 slot) { }
>  void __init acpi_init_cpus(void);
>  
> +#ifdef CONFIG_ACPI_APEI
> +static inline void arch_apei_flush_tlb_one(unsigned long addr)
> +{
> +	flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
> +}
> +#endif

Looking at the callers of this function, I suspect we could downgrade it
to a local CPU invalidation if we wanted. However, this isn't a hot-path
so it's fine to stay like it is for now.

Will
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