[PATCH 6.1 306/417] iommu/dma: Trace bounce buffer usage when mapping buffers

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Isaac J. Manjarres <isaacmanjarres@xxxxxxxxxx>

commit a63c357b9fd56ad5fe64616f5b22835252c6a76a upstream.

When commit 82612d66d51d ("iommu: Allow the dma-iommu api to
use bounce buffers") was introduced, it did not add the logic
for tracing the bounce buffer usage from iommu_dma_map_page().

All of the users of swiotlb_tbl_map_single() trace their bounce
buffer usage, except iommu_dma_map_page(). This makes it difficult
to track SWIOTLB usage from that function. Thus, trace bounce buffer
usage from iommu_dma_map_page().

Fixes: 82612d66d51d ("iommu: Allow the dma-iommu api to use bounce buffers")
Cc: stable@xxxxxxxxxxxxxxx # v5.15+
Cc: Tom Murphy <murphyt7@xxxxxx>
Cc: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Cc: Saravana Kannan <saravanak@xxxxxxxxxx>
Signed-off-by: Isaac J. Manjarres <isaacmanjarres@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231208234141.2356157-1-isaacmanjarres@xxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/iommu/dma-iommu.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -28,6 +28,7 @@
 #include <linux/spinlock.h>
 #include <linux/swiotlb.h>
 #include <linux/vmalloc.h>
+#include <trace/events/swiotlb.h>
 
 #include "dma-iommu.h"
 
@@ -999,6 +1000,8 @@ static dma_addr_t iommu_dma_map_page(str
 			return DMA_MAPPING_ERROR;
 		}
 
+		trace_swiotlb_bounced(dev, phys, size);
+
 		aligned_size = iova_align(iovad, size);
 		phys = swiotlb_tbl_map_single(dev, phys, size, aligned_size,
 					      iova_mask(iovad), dir, attrs);






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