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>
diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
index 4985c6c..46a11c1 100644
--- a/include/linux/dma-debug.h
+++ b/include/linux/dma-debug.h
@@ -76,6 +76,8 @@
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_dump_mappings(struct device *dev)
+{
+}
+
#endif /* CONFIG_DMA_API_DEBUG */
#endif /* __DMA_DEBUG_H */