cat /sys/kernel/debug/dma_buf/bufinfo

Dma-buf Objects:
size    	flags   	mode    	count   	exp_name	ino     	name
03145728	00000000	00080005	00000005	drm	00015547	<none>
	write fence:drm_sched v3d_tfu seq 26158 signalled
	Attached Devices:
	1002000000.v3d
Total 1 devices attached

03145728	00000000	00080005	00000005	drm	00015491	<none>
	write fence:drm_sched v3d_tfu seq 31810 signalled
	write fence:drm_sched v3d_tfu seq 31808 signalled
	Attached Devices:
	1002000000.v3d
Total 1 devices attached

07815168	00000002	00080007	00000013	drm	00003169	<none>
	write fence:drm_sched v3d_render seq 13531 signalled
	write fence:drm_sched v3d_tfu seq 21727 signalled
	Attached Devices:
	axi:gpu
	axi:gpu
Total 2 devices attached

07815168	00000002	00080007	00000013	drm	00003167	<none>
	write fence:drm_sched v3d_render seq 13529 signalled
	write fence:drm_sched v3d_render seq 13526 signalled
	Attached Devices:
	axi:gpu
	axi:gpu
Total 2 devices attached

07815168	00000002	00080007	00000013	drm	00003165	<none>
	write fence:drm_sched v3d_tfu seq 21784 signalled
	write fence:drm_sched v3d_render seq 13525 signalled
	Attached Devices:
	axi:gpu
	axi:gpu
Total 2 devices attached

08306688	00000000	00080005	00000010	drm	00000600	<none>
	write fence:drm_sched v3d_render seq 1318307 signalled
	Attached Devices:
	1002000000.v3d
	1002000000.v3d
Total 2 devices attached