How can DMA be enabled for the device /dev/had?

How can DMA be enabled for the device /dev/had?

A.
echo "1" >/proc/ide/hda/dma

B.
hdparm -d 1 /dev/hda

C.
sysct1 -w dev.ide.dma=l

D.
dma add /dev/hda

E.
insmod dma dev=/dev/hda