question about passing physical address to lower level driver in scsi

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Dear all:
in scsi_init_sgtable, we create sgtable, sdb->table.sgl, and get the
page from blk_rq_map_sg.
But when the dma_address of sdb->table.sgl will be calclated out
before send the scsi command down to the lower level driver?

Thanks for your help in advance,
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