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In preparation for consolidating all DPA partition information into an array of DPA metadata, introduce helpers that hide the layout of the current data. I.e. make the eventual replacement of ->ram_res, ->pmem_res, ->ram_perf, and ->pmem_perf with a new DPA metadata array a no-op for code paths that consume that information, and reduce the noise of follow-on patches. The end goal is to consolidate all DPA information in 'struct cxl_dev_state', but for now the helpers just make it appear that all DPA metadata is relative to @cxlds. As the conversion to generic partition metadata walking is completed, these helpers will naturally be eliminated, or reduced in scope. Cc: Alejandro Lucero <alucerop@amd.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Fan Ni <fan.ni@samsung.com> Tested-by: Alejandro Lucero <alucerop@amd.com> Link: https://patch.msgid.link/173864305238.668823.16553986866633608541.stgit@dwillia2-xfh.jf.intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>