iommu: add ftrace profiling for map and unmap

Add ftrace start and end logging for map, iommu_map_sg and unmap
in order to facilitate performance testing.

Change-Id: I9ddf241ffa6cf519f6abece7b0820640f5ce1975
Signed-off-by: Liam Mark <lmark@codeaurora.org>

2 files changed, 77 insertions, 1 deletions

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 2d835b7c226d..614363f84b38 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -262,7 +262,12 @@ static inline size_t iommu_map_sg(struct iommu_domain *domain,
 				  unsigned long iova, struct scatterlist *sg,
 				  unsigned int nents, int prot)
 {
-	return domain->ops->map_sg(domain, iova, sg, nents, prot);
+	size_t ret;
+
+	trace_map_sg_start(iova, nents);
+	ret = domain->ops->map_sg(domain, iova, sg, nents, prot);
+	trace_map_sg_end(iova, nents);
+	return ret;
 }
 
 extern int iommu_dma_supported(struct iommu_domain *domain, struct device *dev,
diff --git a/include/trace/events/iommu.h b/include/trace/events/iommu.h
index a8f5c32d174b..4f44a9c4a697 100644
--- a/include/trace/events/iommu.h
+++ b/include/trace/events/iommu.h
@@ -113,6 +113,20 @@ DEFINE_EVENT(iommu_map_unmap, map,
 	TP_ARGS(iova, paddr, size)
 );
 
+DEFINE_EVENT(iommu_map_unmap, map_start,
+
+	TP_PROTO(unsigned long iova, phys_addr_t paddr, size_t size),
+
+	TP_ARGS(iova, paddr, size)
+);
+
+DEFINE_EVENT(iommu_map_unmap, map_end,
+
+	TP_PROTO(unsigned long iova, phys_addr_t paddr, size_t size),
+
+	TP_ARGS(iova, paddr, size)
+);
+
 DEFINE_EVENT_PRINT(iommu_map_unmap, unmap,
 
 	TP_PROTO(unsigned long iova, phys_addr_t paddr, size_t size),
@@ -124,6 +138,63 @@ DEFINE_EVENT_PRINT(iommu_map_unmap, unmap,
 	)
 );
 
+DEFINE_EVENT_PRINT(iommu_map_unmap, unmap_start,
+
+	TP_PROTO(unsigned long iova, phys_addr_t paddr, size_t size),
+
+	TP_ARGS(iova, paddr, size),
+
+	TP_printk("IOMMU: iova=0x%016llx size=0x%x",
+			__entry->iova, __entry->size
+	)
+);
+
+DEFINE_EVENT_PRINT(iommu_map_unmap, unmap_end,
+
+	TP_PROTO(unsigned long iova, phys_addr_t paddr, size_t size),
+
+	TP_ARGS(iova, paddr, size),
+
+	TP_printk("IOMMU: iova=0x%016llx size=0x%x",
+			__entry->iova, __entry->size
+	)
+);
+
+DECLARE_EVENT_CLASS(iommu_map_sg,
+
+	TP_PROTO(unsigned long iova, unsigned int nents),
+
+	TP_ARGS(iova, nents),
+
+	TP_STRUCT__entry(
+		__field(u64, iova)
+		__field(int, nents)
+	),
+
+	TP_fast_assign(
+		__entry->iova = iova;
+		__entry->nents = nents;
+	),
+
+	TP_printk("IOMMU: iova=0x%016llx nents=%u",
+			__entry->iova, __entry->nents
+	)
+);
+
+DEFINE_EVENT(iommu_map_sg, map_sg_start,
+
+	TP_PROTO(unsigned long iova, unsigned int nents),
+
+	TP_ARGS(iova, nents)
+);
+
+DEFINE_EVENT(iommu_map_sg, map_sg_end,
+
+	TP_PROTO(unsigned long iova, unsigned int nents),
+
+	TP_ARGS(iova, nents)
+);
+
 DECLARE_EVENT_CLASS(iommu_error,
 
 	TP_PROTO(struct device *dev, unsigned long iova, int flags),