[PATCH 6/7] iommu: Change iommu driver to call map trace event

From: Shuah Khan
Date: Thu Aug 15 2013 - 14:00:34 EST

Change iommu driver to call map trace event. This iommu_map_unmap class event
can be enabled to trigger when iommu map iommu ops is called. Trace information
includes iova, physical address (map event only), and size.

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: map: IOMMU: iova=0x00000000cb800000 paddr=0x00000000cf9fffff size=0x400

Signed-off-by: Shuah Khan <shuah.kh@xxxxxxxxxxx>
drivers/iommu/iommu.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index b630754..ea49fe8 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -842,6 +842,8 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
/* unroll mapping in case something went wrong */
if (ret)
iommu_unmap(domain, orig_iova, orig_size - size);
+ else
+ trace_map(iova, paddr, size);

return ret;

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