This series was previously sent at: https://lore.kernel.org/all/20240321-b4-arm-ras-error-vendor-info-v5-rc3-v5-0-850f9bfb97a8@xxxxxxxxxxxxxxxxxxxxxx/ Those patches that fix UEFI 2.6+ implementation of the ARM trace event, as the original implementation was incomplete. In summary: changeset e9279e83ad1f ("trace, ras: add ARM processor error trace event") was incomplete: it added a trace event that was reporting only some fields of the CPER record generated for ARM processor from UEFI 2.6 spec. Those are not enough there to actually parse such events on userspace, for it to properly report/record the error nor to take appropriate measures to prevent future problems, like poisoning problematic CPU cores and taking them offline. The patch was validated with the help of an ARM EINJ code for QEMU: https://github.com/mchehab/rasdaemon/wiki/error-injection I tested the ghes and cper reports both with and without this change, using different versions of rasdaemon, with and without support for the extended trace event. Those are a summary of the test results: - adding more fields to the trace events didn't break userspace API: both versions of rasdaemon handled it; - the rasdaemon patches to handle the new trace report was missing a backward-compatibility logic. I fixed already. With that, rasdaemon can handle both old and new trace events. Btw, rasdaemon has gained support for the extended trace since its version 0.5.8 (released in 2021). I didn't saw any issues there complain about troubles on it, so either distros used on ARM servers are using an old version of rasdaemon, or they're carrying on the trace event changes as well. --- - Changes over the original changeset: - First patch was simplified to avoid too many #ifdefs; - reordered local vars using reverse xmas tree; - removed uneeded typecasts; - some coding style fixes. Daniel Ferguson (1): RAS: ACPI: APEI: add conditional compilation to ARM error report functions Shengwei Luo (1): RAS: Report all ARM processor CPER information to userspace drivers/acpi/apei/ghes.c | 14 +++++------- drivers/ras/ras.c | 47 +++++++++++++++++++++++++++++++++++++-- include/linux/ras.h | 16 ++++++++++---- include/ras/ras_event.h | 48 +++++++++++++++++++++++++++++++++++----- 4 files changed, 106 insertions(+), 19 deletions(-) -- 2.45.2
