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iommu/dma: Trace bounce buffer usage when mapping buffers

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When commit 82612d66d5 ("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: 82612d66d5 ("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>
This commit is contained in:
Isaac J. Manjarres 2023-12-08 15:41:40 -08:00 committed by Joerg Roedel
parent bf9cd9fef9
commit a63c357b9f
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/dma-iommu.c
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@ -29,6 +29,7 @@
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/swiotlb.h> #include <linux/swiotlb.h>
#include <linux/vmalloc.h> #include <linux/vmalloc.h>
#include <trace/events/swiotlb.h>
#include "dma-iommu.h" #include "dma-iommu.h"
@ -1156,6 +1157,8 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
return DMA_MAPPING_ERROR; return DMA_MAPPING_ERROR;
} }
trace_swiotlb_bounced(dev, phys, size);
aligned_size = iova_align(iovad, size); aligned_size = iova_align(iovad, size);
phys = swiotlb_tbl_map_single(dev, phys, size, aligned_size, phys = swiotlb_tbl_map_single(dev, phys, size, aligned_size,
iova_mask(iovad), dir, attrs); iova_mask(iovad), dir, attrs);