[PATCH 2/2] iommu: Change iommu driver to call report_fault trace event

[Shuah Khan]

Change iommu driver report_iommu_fault() to call report_fault trace event.
This iommu_fault class event can be enabled to trigger when an iommu fault
occurs. Trace information includes driver name, device name, iova, and flags.

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] ....     1.926331: report_fault: IOMMU:pci 0000:00:1d.0 iova=0x00000000cadc6000 flags=0x0001

Signed-off-by: Shuah Khan <shuah.kh@xxxxxxxxxxx>
---
 include/linux/iommu.h |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 3aeb730..9d1c051 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -22,6 +22,7 @@
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/types.h>
+#include <trace/events/iommu.h>
 
 #define IOMMU_READ	(1)
 #define IOMMU_WRITE	(2)
@@ -211,6 +212,7 @@ static inline int report_iommu_fault(struct iommu_domain *domain,
 		ret = domain->handler(domain, dev, iova, flags,
 						domain->handler_token);
 
+	trace_report_fault(dev, iova, flags);
 	return ret;
 }
 
-- 
1.7.10.4

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