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When the kfifo buffer is already dma-mapped, one cannot use the kfifo API to fill in an SG list. Add kfifo_dma_in_prepare_mapped() which allows exactly this. A mapped dma_addr_t is passed and it is filled into provided sgl too. Including the dma_len. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Cc: Stefani Seibold <stefani@seibold.net> Cc: Andrew Morton <akpm@linux-foundation.org> Link: https://lore.kernel.org/r/20240405060826.2521-8-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>