can dma_alloc_coherent & pci_alloc_consistent return a 64bit bus address ?

Autonomous Machines Jetson & Embedded Systems Jetson TX2
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hi all:
can dma_alloc_coherent & pci_alloc_consistent return a 64bit bus address ?

shall we disable SMMU to achieve this?

when SMMU disabled, can we just feed the hardware with " virt_to_phys( __get_free_pages() )" ?

and will virt_to_phys( __get_free_pages() ) be a 64bit physical address ( also bus address in value, since SMMU disabled) ?

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Discussed in [url]PCIE DMA Problem between TX2 & FPGA - Jetson TX2 - NVIDIA Developer Forums