6.6-stable review patch. If anyone has any objections, please let me know.
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From: Isaac J. Manjarres isaacmanjarres@google.com
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@vger.kernel.org # v5.15+ Cc: Tom Murphy murphyt7@tcd.ie Cc: Lu Baolu baolu.lu@linux.intel.com Cc: Saravana Kannan saravanak@google.com Signed-off-by: Isaac J. Manjarres isaacmanjarres@google.com Link: https://lore.kernel.org/r/20231208234141.2356157-1-isaacmanjarres@google.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/dma-iommu.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -29,6 +29,7 @@ #include <linux/spinlock.h> #include <linux/swiotlb.h> #include <linux/vmalloc.h> +#include <trace/events/swiotlb.h>
#include "dma-iommu.h"
@@ -1052,6 +1053,8 @@ 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);