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.
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: map: IOMMU:
iova=0x00000000cb800000 paddr=0x00000000cf9fffff size=0x400
Signed-off-by: Shuah Khan <[email protected]>
---
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;
}
--
1.7.10.4
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