dma_map_sg symbol needed

novice99 · 06-30-2011, 07:45 PM

From the Documentation/DMA-API for using the streaming API the only thing I need to use is linux/dma-mapping.h.
But despite including it in my kernel module its not able to resolve the symbol dma_map_sg.
Its is able to resolve dma_alloc_coherent though.

Can someone please tell me what I need to enable in the kernel to get the DMA streaming mapping API.

Following are already enabled :
CONFIG_HAS_DMA
CONFIG_HAVE_DMA_ATTRS
CONFIG_ISA_DMA_API

I am using Fedora 14 on x86_64.

Thanks in advance!

smallpond · 07-03-2011, 11:11 AM

You're doing it right, but maybe there is a problem in your source tree.

linux/dma-mapping.h includes asm/dma-mapping.h where include/asm should be a link to include/asm-x86_64 in your sources. That will bring in the correct architecture-specific definition.

Is your kernel source installed from an rpm, or is a downloaded tarball?