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The Identify Memory Device command returns information about the volatile only and persistent only memory capacities. Store those values in the cxl_mem structure for later use. While at it, reuse those calculations to calculate the ram and pmem ranges. Signed-off-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/20210617221620.1904031-2-ira.weiny@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>