linux-kernel - Re: [PATCH V3 08/10] ras: acpi / apei: generate trace event for unrecognized CPER section

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Date:   Thu, 13 Oct 2016 11:54:11 +0100
From:   Punit Agrawal <punit.agrawal@....com>
To:     Tyler Baicar <tbaicar@...eaurora.org>
Cc:     christoffer.dall@...aro.org, marc.zyngier@....com,
        pbonzini@...hat.com, rkrcmar@...hat.com, linux@...linux.org.uk,
        catalin.marinas@....com, will.deacon@....com, rjw@...ysocki.net,
        lenb@...nel.org, matt@...eblueprint.co.uk, robert.moore@...el.com,
        lv.zheng@...el.com, mark.rutland@....com, james.morse@....com,
        akpm@...ux-foundation.org, sandeepa.s.prabhu@...il.com,
        shijie.huang@....com, paul.gortmaker@...driver.com,
        tomasz.nowicki@...aro.org, fu.wei@...aro.org, rostedt@...dmis.org,
        bristot@...hat.com, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, Dkvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-efi@...r.kernel.org, devel@...ica.org,
        "Jonathan \(Zhixiong\) Zhang" <zjzhang@...eaurora.org>
Subject: Re: [PATCH V3 08/10] ras: acpi / apei: generate trace event for unrecognized CPER section

Hi Tyler,

One last comment...

Tyler Baicar <tbaicar@...eaurora.org> writes:

> UEFI spec allows for non-standard section in Common Platform Error
> Record. This is defined in section N.2.3 of UEFI version 2.5.
>
> Currently if the CPER section's type (UUID) does not match with
> any section type that the kernel knows how to parse, trace event
> is not generated for such section. And thus user is not able to know
> happening of such hardware error, including error record of
> non-standard section.
>
> This commit generates a trace event which contains raw error data
> for unrecognized CPER section.
>
> Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org>
> Signed-off-by: Tyler Baicar <tbaicar@...eaurora.org>
> ---
>  drivers/acpi/apei/ghes.c | 18 +++++++++++++++++-
>  drivers/ras/ras.c        |  1 +
>  include/ras/ras_event.h  | 45 +++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 63 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 36894c8..cb4c7f4 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -49,6 +49,7 @@
>  #include <acpi/ghes.h>
>  #include <acpi/apei.h>
>  #include <asm/tlbflush.h>
> +#include <ras/ras_event.h>
>  
>  #ifdef CONFIG_HAVE_ACPI_APEI_SEA
>  #include <asm/system_misc.h>
> @@ -468,12 +469,21 @@ static void ghes_do_proc(struct ghes *ghes,
>  	int sev, sec_sev;
>  	struct acpi_hest_generic_data *gdata;
>  	uuid_le sec_type;
> +	uuid_le *fru_id;
> +	char *fru_text = "";
>  
>  	sev = ghes_severity(estatus->error_severity);
>  	apei_estatus_for_each_section(estatus, gdata) {
>  		sec_sev = ghes_severity(gdata->error_severity);
>  		sec_type = *(uuid_le *)gdata->section_type;
>  
> +		if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
> +			fru_id = (uuid_le *)gdata->fru_id;
> +		else
> +			fru_id = &NULL_UUID_LE;

fru_id can be initialised at declaration and drop the else here. The
same is already being done for fru_text.

Thanks,
Punit

> +		if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
> +			fru_text = gdata->fru_text;
> +
>  		if (!uuid_le_cmp(sec_type,
>  				 CPER_SEC_PLATFORM_MEM)) {
>  			struct cper_sec_mem_err *mem_err;

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