AMD_C2P_MSG2
writeq(info.dma_address, privdata->mmio + AMD_C2P_MSG2);
writeq(0x0, privdata->mmio + AMD_C2P_MSG2);
privdata->mmio + AMD_C2P_MSG2);
privdata->mmio + AMD_C2P_MSG2,
memcpy_toio(privdata->mmio + AMD_C2P_MSG2,