Messages in this thread Patch in this message | | | From | Shuah Khan <> | Subject | [PATCH 7/7] iommu: Change iommu driver to call unmap trace event | Date | Thu, 15 Aug 2013 11:59:29 -0600 |
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Change iommu driver to call unmap trace event. This iommu_map_unmap class event can be enabled to trigger when iommu unmap iommu ops is called. Trace information includes iova, physical address (map event only), and size.
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] .... 1.854102: unmap: IOMMU: iova=0x00000000cb800000 size=0x400
Signed-off-by: Shuah Khan <shuah.kh@samsung.com> --- drivers/iommu/iommu.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index ea49fe8..d8c53c7 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -892,6 +892,7 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) unmapped += unmapped_page; } + trace_unmap(iova, 0, size); return unmapped; } EXPORT_SYMBOL_GPL(iommu_unmap); -- 1.7.10.4
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