[PATCH v5 00/10] ACPI: APEI: share GHES CPER helpers and add DT FFH provider

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@arm.com

Signed-off-by: Ahmed Tiba <[email protected]>

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@arm.com

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@arm.com

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/[email protected]

---
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 <[email protected]>