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authorShuah Khan <shuah.khan@hp.com>2012-10-08 11:08:06 -0600
committerJoerg Roedel <joerg.roedel@amd.com>2012-10-24 17:06:43 +0200
commit6c9c6d6301287e369a754d628230fa6e50cdb74b (patch)
treece47f4a8f5005c663c2686ec00d0ba272ace598d /Documentation/DMA-API-HOWTO.txt
parent6f0c0580b70c89094b3422ba81118c7b959c7556 (diff)
dma-debug: New interfaces to debug dma mapping errors
Add dma-debug interface debug_dma_mapping_error() to debug drivers that fail to check dma mapping errors on addresses returned by dma_map_single() and dma_map_page() interfaces. This interface clears a flag set by debug_dma_map_page() to indicate that dma_mapping_error() has been called by the driver. When driver does unmap, debug_dma_unmap() checks the flag and if this flag is still set, prints warning message that includes call trace that leads up to the unmap. This interface can be called from dma_mapping_error() routines to enable dma mapping error check debugging. Tested: Intel iommu and swiotlb (iommu=soft) on x86-64 with CONFIG_DMA_API_DEBUG enabled and disabled. Signed-off-by: Shuah Khan <shuah.khan@hp.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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