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| author | Shuah Khan <shuah.khan@hp.com> | 2012-10-08 21:08:06 +0400 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2012-10-24 19:06:43 +0400 |
| commit | 6c9c6d6301287e369a754d628230fa6e50cdb74b (patch) | |
| tree | ce47f4a8f5005c663c2686ec00d0ba272ace598d /arch/x86/include/asm/dma-mapping.h | |
| parent | 6f0c0580b70c89094b3422ba81118c7b959c7556 (diff) | |
| download | linux-6c9c6d6301287e369a754d628230fa6e50cdb74b.tar.xz | |
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/include/asm/dma-mapping.h')
| -rw-r--r-- | arch/x86/include/asm/dma-mapping.h | 1 |
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 f7b4c7903e7e..808dae63eeea 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); |