Change iommu driver call io_page_fault trace event. This iommu_error class
event can be enabled to trigger when an iommu error 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] .... 2.003774: io_page_fault: IOMMU:pci
0000:00:02.0 iova=0x00000000cb800000 flags=0x0002
swapper/0-1 [003] .... 2.004098: io_page_fault: IOMMU:pci
0000:00:1d.0 iova=0x00000000cadc6000 flags=0x0002
swapper/0-1 [003] .... 2.004115: io_page_fault: IOMMU:pci
0000:00:1a.0 iova=0x00000000cadc6000 flags=0x0002
swapper/0-1 [003] .... 2.004129: io_page_fault: IOMMU:pci
0000:00:1f.0 iova=0x0000000000000000 flags=0x0002
Signed-off-by: Shuah Khan <[email protected]>
---
include/linux/iommu.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7ea319e..a444c79 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)
@@ -227,6 +228,7 @@ static inline int report_iommu_fault(struct iommu_domain
*domain,
ret = domain->handler(domain, dev, iova, flags,
domain->handler_token);
+ trace_io_page_fault(dev, iova, flags);
return ret;
}
--
1.8.1.2
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