[root@myhost ~]# cat /sys/kernel/debug/dri/0/channel/3
channel id    : 3
cpu fifo state:
          base: 0x21040000
           max: 0x00008000
           cur: 0x000000a8
           put: 0x000000a8
          free: 0x00007f58
        ib max: 0x00000fff
        ib put: 0x00000004
       ib free: 0x00000ffb
gpu fifo state:
           get: 0x210400a8
           put: 0x210400a8
        ib get: 0x00000004
        ib put: 0x00000004
last fence    : 1
last signalled: 1
[root@myhost ~]#