Commit 56fa4849 authored Sep 24, 2013 by Shuah Khan Committed by Joerg Roedel Sep 25, 2013

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 <shuah.kh@samsung.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

parent 04fa2f7f

include/linux/iommu.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}