From 56fa484969c367e3ae43a012a7b99f75bb4f3bdb Mon Sep 17 00:00:00 2001 From: Shuah Khan Date: Tue, 24 Sep 2013 15:21:20 -0600 Subject: [PATCH] iommu: Change iommu driver to call io_page_fault trace event 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 Signed-off-by: Joerg Roedel --- include/linux/iommu.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 7ea319e95b47..a444c790fa72 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -22,6 +22,7 @@ #include #include #include +#include #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; } -- 2.34.1