HMM_PFN_P2PDMA_BUS
HMM_PFN_P2PDMA_BUS,
!(pfns[idx] & HMM_PFN_P2PDMA_BUS)) {
pfns[idx] |= HMM_PFN_P2PDMA_BUS | HMM_PFN_DMA_MAPPED;
if (pfns[idx] & HMM_PFN_P2PDMA_BUS)
~(HMM_PFN_DMA_MAPPED | HMM_PFN_P2PDMA | HMM_PFN_P2PDMA_BUS);