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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>
This commit is contained in:
Shuah Khan 2013-09-24 15:21:20 -06:00 committed by Joerg Roedel
parent 04fa2f7f83
commit 56fa484969
1 changed files with 2 additions and 0 deletions
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2
include/linux/iommu.h
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@ -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;
}