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The RDMA device needs information of controller memory bar and doorbell capability to share with user context. Discover CMB regions and express doorbell capabilities on device init. Reviewed-by: Shannon Nelson <shannon.nelson@amd.com> Co-developed-by: Pablo Cascón <pablo.cascon@amd.com> Signed-off-by: Pablo Cascón <pablo.cascon@amd.com> Co-developed-by: Allen Hubbe <allen.hubbe@amd.com> Signed-off-by: Allen Hubbe <allen.hubbe@amd.com> Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com> Link: https://patch.msgid.link/20250903061606.4139957-7-abhijit.gangurde@amd.com Signed-off-by: Leon Romanovsky <leon@kernel.org>