Re: [PATCH v5] acpi, apei: add Boot Error Record Table (BERT) support

[Borislav Petkov]

On Tue, Jan 19, 2016 at 05:34:02PM +0800, fu.wei@xxxxxxxxxx wrote:
> From: Huang Ying <ying.huang@xxxxxxxxx>
> 
> ACPI/APEI is designed to verifiy/report H/W errors, like Corrected
> Error(CE) and Uncorrected Error(UC). It contains four tables: HEST,
> ERST, EINJ and BERT. The first three tables have been merged for
> a long time, but because of lacking BIOS support for BERT, the
> support for BERT is pending until now. Recently on ARM 64 platform
> it is has been supported. So here we come.
> 
> Under normal circumstances, when a hardware error occurs, kernel will
> be notified via NMI, MCE or some other method, then kernel will
> process the error condition, report it, and recover it if possible.
> But sometime, the situation is so bad, so that firmware may choose to
> reset directly without notifying Linux kernel.
> 
> Linux kernel can use the Boot Error Record Table (BERT) to get the
> un-notified hardware errors that occurred in a previous boot. In this
> patch, the error information is reported via printk.
> 
> For more information about BERT, please refer to ACPI Specification
> version 6.0, section 18.3.1:
>   http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf
> 
> The following log is a BERT record after system reboot because of hitting
> a fatal memory error:
> BERT: Error records from previous boot:
> [Hardware Error]: It has been corrected by h/w and requires no further action
> [Hardware Error]: event severity: corrected
> [Hardware Error]:  Error 0, type: recoverable
> [Hardware Error]:   section_type: memory error
> [Hardware Error]:   error_status: 0x0000000000000400
> [Hardware Error]:   physical_address: 0xffffffffffffffff
> [Hardware Error]:   card: 1 module: 2 bank: 3 row: 1 column: 2 bit_position: 5
> [Hardware Error]:   error_type: 2, single-bit ECC
> 
> [Tomasz Nowicki: Clear error status at the end of error handling]
> [Tony: Applied some cleanups suggested by Fu Wei]
> [Fu Wei: delete EXPORT_SYMBOL_GPL(bert_disable), improve the code]
> 
> Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
> Signed-off-by: Chen, Gong <gong.chen@xxxxxxxxxxxxxxx>
> Tested-by: Jonathan (Zhixiong) Zhang <zjzhang@xxxxxxxxxxxxxx>
> Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
> Signed-off-by: Fu Wei <fu.wei@xxxxxxxxxx>
> Tested-by: Tyler Baicar <tbaicar@xxxxxxxxxxxxxx>
> ---
> Changelog:
> v5: Drop some superfluous comments.
>     Use the introduce of BERT in ACPI Specification instead of original one
>     at the head of bert.c.
>     Fix typo in apei-internal.h
>     Simplify the introduce of bert_disable.
> 
> v4: https://lkml.org/lkml/2016/1/8/382
>     Fix the "#undef" bug
>     Improve the instruction of "bert_disable",
>     Delete the useless declaration in include/acpi/apei.h.
> 
> v3: https://lkml.org/lkml/2016/1/7/214
>     Merge the two patches
>     Do some improvements according to Borislav's suggestion.
> 
> v2: https://lkml.org/lkml/2015/8/18/336
>     Delete EXPORT_SYMBOL_GPL(bert_disable), because "bert_disable" is only
>     used in bert.c for now.
>     Do some code-style cleanups.
> 
> v1: The first upstream version submitted in linux-acpi mailing list:
>     http://www.spinics.net/lists/linux-acpi/msg57384.html
> 
>  Documentation/kernel-parameters.txt |   3 +
>  drivers/acpi/apei/Makefile          |   2 +-
>  drivers/acpi/apei/apei-internal.h   |   2 +-
>  drivers/acpi/apei/bert.c            | 150 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 155 insertions(+), 2 deletions(-)

Reviewed-by: Borislav Petkov <bp@xxxxxxx>

-- 
Regards/Gruss,
    Boris.

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