iommu: Change iommu driver to call unmap trace event
Change iommu driver to call unmap trace event. This iommu_map_unmap class
event can be enabled to trigger when iommu unmap iommu ops is called. Trace
information includes iova, physical address (map event only), and size.
Testing:
Added trace calls to iommu_prepare_identity_map() for testing some of the
conditions that are hard to trigger. Here is the trace from the testing:
swapper/0-1 [003] .... 1.854102: unmap: IOMMU: iova=0x00000000cb800000 size=0x400
Signed-off-by: Shuah Khan <shuah.kh@samsung.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index ea49fe8..d8c53c7 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -892,6 +892,7 @@
unmapped += unmapped_page;
}
+ trace_unmap(iova, 0, size);
return unmapped;
}
EXPORT_SYMBOL_GPL(iommu_unmap);