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Message-ID: <7173434.pR4ItzAsEj@vostro.rjw.lan>
Date: Thu, 28 Jul 2016 01:12:46 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: fu.wei@...aro.org
Cc: tn@...ihalf.com, len.brown@...el.com, pavel@....cz,
catalin.marinas@....com, will.deacon@....com, tglx@...utronix.de,
mingo@...hat.com, hpa@...or.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, graeme.gregory@...aro.org,
al.stone@...aro.org, hanjun.guo@...aro.org, mark.rutland@....com,
Marc.Zyngier@....com, lorenzo.pieralisi@....com,
rruigrok@...eaurora.org, harba@....qualcomm.com,
tbaicar@...eaurora.org, 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.
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.
> ---
> 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.
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