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The cxl_test module currently hard-codes auto regions in the mock topology, limiting coverage of the driver's region auto-assembly logic. Teach cxl_test to replay previously committed decoder programming across a cxl_acpi unbind/bind cycle. Decoder programming is recorded in a registry keyed by a stable port identity and decoder id. The registry is updated on decoder commit and reset events and consulted during enumeration to restore previously enabled decoders. This allows regions created through the user interface to be replayed during enumeration and treated as auto-discovered regions, enabling testing of region auto-assembly using configurations created in the cxl_test topology. Example workflow: # cxl create-region ... # echo 1 > /sys/bus/platform/devices/cxl_acpi.0/decoder_reset_preserve_registry # echo cxl_acpi.0 > /sys/bus/platform/drivers/cxl_acpi/unbind # echo cxl_acpi.0 > /sys/bus/platform/drivers/cxl_acpi/bind # echo 0 > /sys/bus/platform/devices/cxl_acpi.0/decoder_reset_preserve_registry The NDCTL CXL unit test, cxl-region-replay.sh, demonstrates the usage. Co-developed-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Co-developed-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Alison Schofield <alison.schofield@intel.com> Link: https://patch.msgid.link/20260314061952.2221030-1-alison.schofield@intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>