lkml.org 
[lkml]   [2016]   [Mar]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v8] acpi, apei, arm64: APEI initial support for aarch64.
On Tue, Mar 29, 2016 at 03:44:18PM +0800, fu.wei@linaro.org wrote:
> From: Tomasz Nowicki <tomasz.nowicki@linaro.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 EFI when ACPI_APEI 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@linaro.org>
> Tested-by: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> Signed-off-by: Fu Wei <fu.wei@linaro.org>
> Acked-by: Hanjun Guo <hanjun.guo@linaro.org>
> Tested-by: Tyler Baicar <tbaicar@codeaurora.org>
> ---
> Changelog:
> v8: 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 | 15 ++++++++++++++-
> arch/x86/kernel/acpi/apei.c | 3 ---
> drivers/acpi/apei/Kconfig | 1 +
> drivers/acpi/apei/hest.c | 18 +++++++++++++++---
> 5 files changed, 31 insertions(+), 7 deletions(-)
>
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 4f43622..08952ec 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_DEVMEM_IS_ALLOWED
> select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
> select ARCH_HAS_ELF_RANDOMIZE
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index aee323b..4a6c959 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 \
> @@ -110,7 +111,19 @@ 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
>
> +/*
> + * This inline function is used in IRQ context (by GHES driver now),
> + * see ghes_iounmap_irq and ghes_iounmap_nmi in drivers/acpi/apei/ghes.c.
> + * The page mapped is reserved for firmware in kernel. This invalidate TLB
> + * maintenance should be broadcasted safely to make sure that all the cores
> + * will do TLB invalidation, then get the right pages.
> + */

How about:

/*
* 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.
*/

With that,

Acked-by: Will Deacon <will.deacon@arm.com>

Will

\
 
 \ /
  Last update: 2016-03-29 19:01    [W:0.102 / U:0.320 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site