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authorDavid Woodhouse <dwmw2@infradead.org>2009-02-12 16:19:13 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2009-03-17 12:56:39 +0100
commitac26c18bd35d982d1ba06020a992b1085fefc3e2 (patch)
tree33f7fe1a22848c7dfdd002298f27efff103480a4 /include/linux/dma-debug.h
parenta31fba5d68cebf8f5fefd03e079dab94875e25f5 (diff)
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dma-debug: add function to dump dma mappings
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>
Diffstat (limited to 'include/linux/dma-debug.h')
-rw-r--r--include/linux/dma-debug.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
index 4985c6c5237..46a11c10da0 100644
--- a/include/linux/dma-debug.h
+++ b/include/linux/dma-debug.h
@@ -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 */