Re: [PATCH 2/2] ras: acpi/apei: trace event for vendor proprietary CPER section

Borislav Petkov
2015-07-22T07:36:26Z

On Tue, Jul 21, 2015 at 04:36:47PM -0700, Jonathan (Zhixiong) Zhang wrote:
> From: "Jonathan (Zhixiong) Zhang" <zjzhang@codeaurora.org>
>
> Trace event is generated when hardware detected a hardware error
> event, which is of non-standard section as defined in UEFI
> spec appendix "Common Platform Error Record" (section N.2.3 of
> UEFI version 2.5).
>
> The trace buffer contains length of error data and raw error data
> in hex.
>
> Following is a sample output of "perf script":
> _________swapper_____0_[000]___133.521441:_ras:vendor_event:_len=88_raw=11_20_0
> 0_01_16_04_15_20_01_00_00_01_02_00_00_00_45_43_43_5f_43_45_5f_52_4d_57_00_00_00
> _00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00
> 00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00_80_fe_00_00_00_00_04_0
> 0_00_00_45_43_43_5f
>
> Change-Id: Ic8661310133b0ae51f6b299cdde3cd0fa5517464
> Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
> ---
> drivers/acpi/apei/ghes.c | 29 +++++++++++++++++++++++++++--
> drivers/ras/ras.c | 1 +
> include/ras/ras_event.h | 30 ++++++++++++++++++++++++++++++
> 3 files changed, 58 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 67fc948da17a..03114d27d218 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -53,9 +53,15 @@
> #include <acpi/ghes.h>
> #include <acpi/apei.h>
> #include <asm/tlbflush.h>
> +#include <ras/ras_event.h>
>
> #include "apei-internal.h"
>
> +static uuid_le sec_vendor_uuids[] = {
> + CPER_SEC_QTI_ERR,
> + NULL_UUID_LE,
> +};
> +
> #define GHES_PFX "GHES: "
>
> #define GHES_ESTATUS_MAX_SIZE 65536
> @@ -440,11 +446,14 @@ static void ghes_do_proc(struct ghes *ghes,
> {
> int sev, sec_sev;
> struct acpi_hest_generic_data *gdata;
> + uuid_le sec_type;
>
> sev = ghes_severity(estatus->error_severity);
> apei_estatus_for_each_section(estatus, gdata) {
> sec_sev = ghes_severity(gdata->error_severity);
> - if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
> + sec_type = *(uuid_le *)gdata->section_type;
> +
> + if (!uuid_le_cmp(sec_type,
> CPER_SEC_PLATFORM_MEM)) {

No need to break lines like that - 80 cols rule is superceded by common
sense.

> struct cper_sec_mem_err *mem_err;
> mem_err = (struct cper_sec_mem_err *)(gdata+1);
> @@ -454,7 +463,7 @@ static void ghes_do_proc(struct ghes *ghes,
> ghes_handle_memory_failure(gdata, sev);
> }
> #ifdef CONFIG_ACPI_APEI_PCIEAER
> - else if (!uuid_le_cmp(*(uuid_le *)gdata->section_type,
> + else if (!uuid_le_cmp(sec_type,
> CPER_SEC_PCIE)) {
> struct cper_sec_pcie *pcie_err;
> pcie_err = (struct cper_sec_pcie *)(gdata+1);
> @@ -486,6 +495,22 @@ static void ghes_do_proc(struct ghes *ghes,
>
> }
> #endif
> + else {

If you return in the cases above, you can save yourself this last else
and an intentation level...

> + int i;
> +
> + for (i = 0; uuid_le_cmp(sec_vendor_uuids[i],
> + NULL_UUID_LE); i++) {

... and not break statements like that...

> + if (!uuid_le_cmp(sec_type,
> + sec_vendor_uuids[i])) {

... and like that.

> + const void *vendor_err;
> +
> + vendor_err = gdata + 1;
> + trace_vendor_event(vendor_err,
> + gdata->error_data_length);
> + break;
> + }
> + }
> + }
> }
> }
>
> diff --git a/drivers/ras/ras.c b/drivers/ras/ras.c
> index b67dd362b7b6..a656ff131249 100644
> --- a/drivers/ras/ras.c
> +++ b/drivers/ras/ras.c
> @@ -27,3 +27,4 @@ subsys_initcall(ras_init);
> EXPORT_TRACEPOINT_SYMBOL_GPL(extlog_mem_event);
> #endif
> EXPORT_TRACEPOINT_SYMBOL_GPL(mc_event);
> +EXPORT_TRACEPOINT_SYMBOL_GPL(vendor_event);
> diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
> index 79abb9c71772..a3038653f72d 100644
> --- a/include/ras/ras_event.h
> +++ b/include/ras/ras_event.h
> @@ -161,6 +161,36 @@ TRACE_EVENT(mc_event,
> );
>
> /*
> + * Vendor Proprietary Events Report
> + *
> + * Those event is generated when hardware detected a hardware
> + * error event, which is of non-standard section as defined
> + * in UEFI spec appendix "Common Platform Error Record".
> + *
> + */
> +TRACE_EVENT(vendor_event,

This should be something more generic like "data_event" or
"raw_data_event" which can be used as a catch-all for all non-standard
formats the UEFI insanity spec will come up with in the future.

--
Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.
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