Re: [PATCH v3 0/7] CPER: Add Memory Error Section 2 support

[Pierre Gondois <pierre.gondois@arm.com>]

+ Ashok

On 11/4/26 12:03, Pierre Gondois wrote:
> The support is mostly duplicated from Memory Error Section handling.
> Other than differences coming from the content of  Memory Error
> Section 1 and 2, differences in the support are:
>
> - v2 do not rely on a compact "struct cper_mem_err_compact" struct.
> This structure was used to support older versions of the Memory
> Error Section (1). This is not needed for the new structure.
>
> - The compact version is also used by the tracing framework.
> To avoid relying and propagating a non-standard record format,
> through trace event (cf. extlog_mem event) the new trace event
> prints each field individually.
>
> The last patch of the serie was only build-tested due to the
> absence of relevant hardware. apei_mce_report_mem_error() and
> arch_apei_report_mem_error() implementations were also removed since
> last version.
>
> It will also require a proper handling from the rasdaemon. Applying
> this last patch without rasdaemon support will silent the reports of
> Memory Error Section 2 error, cf. ras_userspace_consumers() check.
>
> Future:
> - _OSC support
> - Addition of arm64 tracepoints
> https://lore.kernel.org/lkml/20261023170405.000060b8@oss.qualcomm.com/
> - Emission of lossy CPER Mem error v1 tracepoints for legacy userspace
>    tools
> https://lore.kernel.org/lkml/at0rs4parlHFGI7k@hu-ashoraj-lv.qualcomm.com/
>
>
> RFC: https://lore.kernel.org/all/20260929074659.2587216-1-pierre.gondois@arm.com/#t
> V1:  https://lore.kernel.org/all/20261019145643.1877246-1-pierre.gondois@arm.com/
> - Corrections from Jonathan's review
> - New patch:
>      [PATCH v2 4/6] EDAC/ghes: Extract error report initialization
> - Last patch not in RFC as it has been reviewed by Jonathan@
>      [PATCH v2 6/6] ACPI: extlog: add Memory Error Section 2 trace event
> V2:
> - Updated ghes_edac_init_error() to ghes_edac_init_error_desc(),
>    which now only acts on the input "struct edac_raw_error_desc"
>    + added lockdep_assert_held() to ghes_edac_init_error_desc()
> - Accumulate failures with "queued |=" in ghes_do_proc()
> - New PATCH:
>    [PATCH v3 5/7] ACPI: APEI: Extract common memory failure handling
>
> Pierre Gondois (7):
>    cper: use BIT_ULL() for processor and memory validation bits
>    cper: add Memory Error Section 2 structures
>    cper: add helpers to handle Memory Error Section 2
>    EDAC/ghes: Extract error report initialization
>    ACPI: APEI: Extract common memory failure handling
>    ACPI: APEI: add separate Memory Error Section 2 handlers
>    ACPI: extlog: add Memory Error Section 2 trace event
>
>   drivers/acpi/acpi_extlog.c  |   6 ++
>   drivers/acpi/apei/ghes.c    |  58 +++++++++--
>   drivers/edac/ghes_edac.c    | 189 +++++++++++++++++++++++++++++-------
>   drivers/firmware/efi/cper.c | 109 +++++++++++++++++++++
>   drivers/ras/ras.c           |   1 +
>   include/acpi/ghes.h         |   2 +
>   include/linux/cper.h        | 129 +++++++++++++++++-------
>   include/ras/ras_event.h     | 102 +++++++++++++++++++
>   8 files changed, 518 insertions(+), 78 deletions(-)
>
> --
> 2.43.0