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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 /arch/x86
parent6f0c0580b70c89094b3422ba81118c7b959c7556 (diff)
downloadop-kernel-dev-6c9c6d6301287e369a754d628230fa6e50cdb74b.zip
op-kernel-dev-6c9c6d6301287e369a754d628230fa6e50cdb74b.tar.gz
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/dma-mapping.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index f7b4c79..808dae6 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -47,6 +47,7 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
struct dma_map_ops *ops = get_dma_ops(dev);
+ debug_dma_mapping_error(dev, dma_addr);
if (ops->mapping_error)
return ops->mapping_error(dev, dma_addr);
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