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dma-debug: add function to dump dma mappings

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This adds a function to dump the DMA mappings that the debugging code is
aware of -- either for a single device, or for _all_ devices.

This can be useful for debugging -- sticking a call to it in the DMA
page fault handler, for example, to see if the faulting address _should_
be mapped or not, and hence work out whether it's IOMMU bugs we're
seeing, or driver bugs.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse
2009-02-12 16:19:13 +01:00
committed by Joerg Roedel
parent a31fba5d68
commit ac26c18bd3
2 changed files with 36 additions and 0 deletions
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6
include/linux/dma-debug.h
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@ -76,6 +76,8 @@ extern void debug_dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sg,
int nelems, int direction);
extern void debug_dma_dump_mappings(struct device *dev);
#else /* CONFIG_DMA_API_DEBUG */
static inline void dma_debug_init(u32 num_entries)
@ -156,6 +158,10 @@ static inline void debug_dma_sync_sg_for_device(struct device *dev,
{
}
static inline void debug_dma_dump_mappings(struct device *dev)
{
}
#endif /* CONFIG_DMA_API_DEBUG */
#endif /* __DMA_DEBUG_H */