This is v4 of the GHES refactor series. Compared to v3, it mainly
updates the shared header comment and the DT binding/description
for the firmware-owned CPER buffer.

Signed-off-by: Ahmed Tiba <ahmed.tiba@arm.com>

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/20251217112845.1814119-1-ahmed.tiba@arm.com

---
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 |   71 ++
 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, 1559 insertions(+), 1036 deletions(-)
---
base-commit: e1914add2799225a87502051415fc5c32aeb02ae
change-id: 20260220-topics-ahmtib01-ras_ffh_arm_internal_review-bfddc7fc7cab

Best regards,
-- 
Ahmed Tiba <ahmed.tiba@arm.com>