ata_dma
static int ata_dma = 1;
TUNABLE_INT("hw.ata.ata_dma", &ata_dma);
if (ata_dma == 0 && (mode == 0 || mode > ATA_PIO_MAX))
struct ata_dma dma; /* DMA data */
struct ata_dma dma; /* DMA data / functions */
struct ata_dma dma; /* DMA data */
struct ata_dma dma; /* DMA data */