[PATCH v5 00/10] ACPI: APEI: share GHES CPER helpers and add DT FFH provider
From: Ahmed Tiba
Date: Fri May 29 2026 - 05:57:33 EST
This is v5 of the GHES refactor series. Compared to v4, it only updates
the DT binding to address the latest review comments.
Changes in v5:
- Dropped the `oneOf` from `memory-region` and described it as a plain
list with `minItems: 1`.
- Simplified the DT example to keep only the `arm,ras-cper` device node.
- Link to v4: https://lore.kernel.org/r/20260518-topics-ahmtib01-ras_ffh_arm_internal_review-v4-0-42698675ba61@xxxxxxx
Signed-off-by: Ahmed Tiba <ahmed.tiba@xxxxxxx>
Changes in v4:
- Reworded the ghes_cper.h header comment and kept the original copyrights.
- Fixed the ghes_cper.h W=1 warnings by limiting the ACPI
fixmap-based declarations to the ACPI build path.
- Updated the DT binding to describe the CPER buffer
as firmware-owned shared memory.
- Described the optional ack area as a second memory-region entry.
- Updated the DT example accordingly.
- Link to v3: https://lore.kernel.org/r/20260318-topics-ahmtib01-ras_ffh_arm_internal_review-v3-0-48e6a1c249ef@xxxxxxx
Changes in v3:
- Fixed the new ghes_cper.h header comment and kept the original
copyrights.
- Added <linux/bitfield.h> to fix the kernel test robot build failure.
- Renamed the binding/compatible and DT-side naming to ras-cper.
- Switched the DT provider to generic firmware property accessors.
- Replaced atomic source IDs with IDA.
- Updated IRQ/error/resource handling as suggested in review
(platform_get_irq(), dev_err_probe(), devm platform ioremap
helpers).
- Removed the ARM64 dependency and fixed Kconfig/build coverage.
- Clarified comments and kept the early move patches mechanical.
- Link to v2: https://lore.kernel.org/r/20260220-topics-ahmtib01-ras_ffh_arm_internal_review-v2-0-347fa2d7351b@xxxxxxx
Changes in v2:
- Dropped the proposed "estatus core" and kept GHES naming/flow intact
(per Borislav Petkov).
- Re-sliced the series into smaller mechanical steps (per Mauro Carvalho Chehab).
- Minor DT binding fixes based on Krzysztof Kozlowski's feedback.
- Removed fixmap slot usage from the DT FFH driver (per Will Deacon).
Series structure:
- Patches 1-8 are mechanical moves only and do not change behavior.
- Patch 9 wires the shared helpers back into GHES.
- The DT firmware-first CPER buffer provider is added in the final patches.
- "ACPI: APEI: introduce GHES helper" is internal build glue only
and does not introduce a new user-visible configuration option.
- Link to v1: https://lore.kernel.org/r/20251217112845.1814119-1-ahmed.tiba@xxxxxxx
---
Ahmed Tiba (10):
ACPI: APEI: GHES: share macros via a private header
ACPI: APEI: GHES: move CPER read helpers
ACPI: APEI: GHES: move GHESv2 ack and alloc helpers
ACPI: APEI: GHES: move estatus cache helpers
ACPI: APEI: GHES: move vendor record helpers
ACPI: APEI: GHES: move CXL CPER helpers
ACPI: APEI: introduce GHES helper
ACPI: APEI: share GHES CPER helpers
dt-bindings: firmware: add arm,ras-cper
RAS: add firmware-first CPER provider
Documentation/admin-guide/RAS/main.rst | 18 +
.../devicetree/bindings/firmware/arm,ras-cper.yaml | 54 +
MAINTAINERS | 6 +
drivers/Makefile | 1 +
drivers/acpi/Kconfig | 4 +
drivers/acpi/apei/Kconfig | 1 +
drivers/acpi/apei/apei-internal.h | 10 +-
drivers/acpi/apei/ghes.c | 1025 +------------------
drivers/acpi/apei/ghes_cper.c | 1027 ++++++++++++++++++++
drivers/ras/Kconfig | 11 +
drivers/ras/Makefile | 1 +
drivers/ras/cper-esource.c | 257 +++++
include/acpi/ghes.h | 10 +-
include/acpi/ghes_cper.h | 151 +++
include/cxl/event.h | 2 +-
15 files changed, 1542 insertions(+), 1036 deletions(-)
---
base-commit: 8fde5d1d47f69db6082dfa34500c27f8485389a5
change-id: 20260220-topics-ahmtib01-ras_ffh_arm_internal_review-bfddc7fc7cab
Best regards,
--
Ahmed Tiba <ahmed.tiba@xxxxxxx>