[PATCH 0/3] CXL: Add a loadable module for address translation

[alison.schofield@intel.com]

From: Alison Schofield <alison.schofield@intel.com>

This set doesn't have a base commit. It is based on cxl/next plus the
Poison by Region Offset patchset [1], plus the fix to Limit XOR map
application based on host bridge ways [2] which this test module exposed.

[1] https://lore.kernel.org/linux-cxl/cover.1754290144.git.alison.schofield@intel.com/
[2] https://lore.kernel.org/linux-cxl/20250804082357.2590809-1-alison.schofield@intel.com/

This series refactors CXL address translation code to support testing
and adds a dedicated test module for validation of the translation
calculations.

The work is presented in 3 patches:
1. Extracts the core translation logic into standalone, testable functions.
2. Provides access to XOR interleave calculations without exposing internal
   CXIMS structures to test modules.
3. Adds the test module that validates both Host to Device, and Device
   to Host address translations.

Accessing the core functions in the test module was implemented by 
adding the needed core/region functions to cxl_core_exports.c and 
adding a similar 'cxl_acpi_exports.c' to access the cxl/acpi.c funcs.

The companion CXL Unit Test script will be posted separately.


Alison Schofield (3):
  cxl/region: Refactor address translation funcs for testing
  cxl/acpi: Make the XOR calculations available for testing
  cxl/test: Add cxl_translate module for address translation testing

 drivers/cxl/acpi.c                     |  51 ++++-
 drivers/cxl/core/region.c              | 145 +++++++-----
 drivers/cxl/cxl.h                      |   3 +
 include/linux/acpi.h                   |   7 +
 tools/testing/cxl/Kbuild               |   1 +
 tools/testing/cxl/cxl_acpi_exports.c   |  13 ++
 tools/testing/cxl/cxl_core_exports.c   |  11 +
 tools/testing/cxl/test/Kbuild          |   2 +
 tools/testing/cxl/test/cxl_translate.c | 298 +++++++++++++++++++++++++
 9 files changed, 467 insertions(+), 64 deletions(-)
 create mode 100644 tools/testing/cxl/cxl_acpi_exports.c
 create mode 100644 tools/testing/cxl/test/cxl_translate.c

-- 
2.37.3