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Add an abstraction layer between the drm_gpuva mappings of a particular drm_gem_object and this GEM object itself. The abstraction represents a combination of a drm_gem_object and drm_gpuvm. The drm_gem_object holds a list of drm_gpuvm_bo structures (the structure representing this abstraction), while each drm_gpuvm_bo contains list of mappings of this GEM object. This has multiple advantages: 1) We can use the drm_gpuvm_bo structure to attach it to various lists of the drm_gpuvm. This is useful for tracking external and evicted objects per VM, which is introduced in subsequent patches. 2) Finding mappings of a certain drm_gem_object mapped in a certain drm_gpuvm becomes much cheaper. 3) Drivers can derive and extend the structure to easily represent driver specific states of a BO for a certain GPUVM. The idea of this abstraction was taken from amdgpu, hence the credit for this idea goes to the developers of amdgpu. Cc: Christian König <christian.koenig@amd.com> Acked-by: Christian König <christian.koenig@amd.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> Signed-off-by: Danilo Krummrich <dakr@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231108001259.15123-11-dakr@redhat.com