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Add a new GEM domain bit AMDGPU_GEM_DOMAIN_MMIO_REMAP to allow userspace to request the MMIO remap (HDP flush) page via GEM_CREATE. - include/uapi/drm/amdgpu_drm.h: * define AMDGPU_GEM_DOMAIN_MMIO_REMAP * include the bit in AMDGPU_GEM_DOMAIN_MASK v2: Add early reject in amdgpu_gem_create_ioctl() (Alex). Cc: Christian König <christian.koenig@amd.com> Suggested-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>