Date:	Thu, 28 Jul 2016 11:37:34 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	tn@...ihalf.com, len.brown@...el.com, pavel@....cz,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
	hpa@...or.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	x86@...nel.org,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>, mark.rutland@....com,
	Marc Zyngier <Marc.Zyngier@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	rruigrok@...eaurora.org,
	"Abdulhamid, Harb" <harba@....qualcomm.com>,
	"Baicar, Tyler" <tbaicar@...eaurora.org>,
	Jon Masters <jcm@...hat.com>, msalter@...hat.com,
	grant.likely@...aro.org, rrichter@...ium.com,
	jarkko.nikula@...ux.intel.com, jon.zhixiong.zhang@...il.com,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH v11] acpi, apei, arm64: APEI initial support for aarch64.

Hi Rafael,

On 28 July 2016 at 07:12, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Thursday, July 28, 2016 01:29:05 AM 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>
>
> You have an impressive list of addresses in the CC, the majority of them
> probably quite irrelevant.  Any chance to reduce that next time?
>
> Boris and Tony need to be CCed, though.

OK, will do, Thanks for reminding me  :-)

>
>> ---
>> Changelog:
>> v11:https://lkml.org/lkml/2016/7
>>     Rebase to v4.7-0e06f5c0
>>
>> v10:https://lkml.org/lkml/2016/4/14
>>     Fix the Alphabetical order problem in arch/arm64/Kconfig
>>
>> v9: https://lkml.org/lkml/2016/4/5/522
>>     Improve the comment for arch_apei_flush_tlb_one.
>>     Using select "HAVE_ACPI_APEI if (ACPI && EFI)" to fix the EFI dependence
>>     problem.
>>
>> v8: https://lkml.org/lkml/2016/3/29/132
>>     Fix a "undefined reference" bug by selecting EFI when ACPI_APEI is set
>>     on ARM64.
>>
>> v7: https://lkml.org/lkml/2016/3/17/183
>>     Add comment for arch_apei_flush_tlb_one in arch/arm64/include/asm/acpi.h
>>
>> v6: https://lists.linaro.org/pipermail/linaro-acpi/2016-March/006644.html
>>     Move HEST type (ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) checking to
>>     a generic place.
>>     Delete HAVE_ACPI_APEI_HEST_IA32.
>>
>> v5: https://lkml.org/lkml/2015/12/10/131
>>     Add "HAVE_ACPI_APEI_HEST_IA32" instead of
>>     "#if defined(__i386__) || defined(__x86_64__)".
>>
>> v4: https://lkml.org/lkml/2015/12/8/188
>>     Rebase to latest kernel version(4.4-rc4).
>>     Move arch_apei_flush_tlb_one into header file as a inline function
>>     Add a new subfunction "hest_ia_init" for "acpi_disable_cmcff".
>>
>> v3: https://lkml.org/lkml/2015/12/3/521
>>     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".
>>
>>  arch/arm64/Kconfig            |  1 +
>>  arch/arm64/include/asm/acpi.h | 16 +++++++++++++++-
>>  arch/x86/kernel/acpi/apei.c   |  3 ---
>>  drivers/acpi/apei/hest.c      | 18 +++++++++++++++---
>>  4 files changed, 31 insertions(+), 7 deletions(-)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 20d5a60..a301765 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -49,6 +49,7 @@ config ARM64
>>       select GENERIC_TIME_VSYSCALL
>>       select HANDLE_DOMAIN_IRQ
>>       select HARDIRQS_SW_RESEND
>> +     select HAVE_ACPI_APEI if (ACPI && EFI)
>>       select HAVE_ALIGNED_STRUCT_PAGE if SLUB
>>       select HAVE_ARCH_AUDITSYSCALL
>>       select HAVE_ARCH_BITREVERSE
>> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
>> index 5420cb0..d3d02dc 100644
>> --- a/arch/arm64/include/asm/acpi.h
>> +++ b/arch/arm64/include/asm/acpi.h
>> @@ -17,6 +17,7 @@
>>
>>  #include <asm/cputype.h>
>>  #include <asm/smp_plat.h>
>> +#include <asm/tlbflush.h>
>>
>>  /* Macros for consistency checks of the GICC subtable of MADT */
>>  #define ACPI_MADT_GICC_LENGTH        \
>> @@ -110,8 +111,21 @@ static inline const char *acpi_get_enable_method(int cpu)
>>  }
>>
>>  #ifdef       CONFIG_ACPI_APEI
>> +#define acpi_disable_cmcff 1
>>  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 with junk
>> + * 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
>> @@ -24,9 +24,6 @@ int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data)
>>       struct acpi_hest_ia_corrected *cmc;
>>       struct acpi_hest_ia_error_bank *mc_bank;
>>
>> -     if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
>> -             return 0;
>> -
>>       cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
>>       if (!cmc->enabled)
>>               return 0;
>> 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
>> @@ -123,7 +123,18 @@ EXPORT_SYMBOL_GPL(apei_hest_parse);
>>   */
>>  static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
>>  {
>> -     return arch_apei_enable_cmcff(hest_hdr, data);
>> +     if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
>> +             return 0;
>> +
>> +     if (!acpi_disable_cmcff)
>> +             return !arch_apei_enable_cmcff(hest_hdr, data);
>> +
>> +     return 0;
>> +}
>> +
>> +static inline int __init hest_ia32_init(void)
>> +{
>> +     return apei_hest_parse(hest_parse_cmc, NULL);
>>  }
>>
>>  struct ghes_arr {
>> @@ -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();
>> +     if (rc)
>> +             goto err;
>>
>>       if (!ghes_disable) {
>>               rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
>>
>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat

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