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The root decoder provides the callbacks hpa_to_spa and spa_to_hpa to perform Host Physical Address (HPA) and System Physical Address translations, respectively. The callbacks are required to convert addresses when HPA != SPA. XOR interleaving depends on this mechanism, and the necessary handlers are implemented. The translation handlers are used for poison injection (trace_cxl_poison, cxl_poison_inject_fops) and error handling (cxl_event_trace_record). In AMD Zen5 systems with Normalized Addressing, endpoint addresses are not SPAs, and translation handlers are required for these features to function correctly. Now, as ACPI PRM translation could be expensive in tracing or error handling code paths, do not yet enable translations to avoid its intensive use. Instead, disable those features which are used only for debugging and enhanced logging. Introduce the flag CXL_REGION_F_NORMALIZED_ADDRESSING that indicates Normalized Addressing for a region and use it to disable poison injection and DPA to HPA conversion. Note: Dropped unused CXL_DECODER_F_MASK macro. [dj: Fix commit log CXL_REGION_F_NORM_ADDR to CXL_REGION_F_NORMALIZED_ADDRESSING ] Reviewed-by: Alison Schofield <alison.schofield@intel.com> Signed-off-by: Robert Richter <rrichter@amd.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Link: https://patch.msgid.link/20260114164837.1076338-14-rrichter@amd.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>