Subject: [PATCH v5 06/20] dma: swiotlb: pass mapping attributes by reference

From: "Aneesh Kumar K.V (Arm)" <[email-masked]>
Date: Fri, 22 May 2026 09:58:01 +0530

Change swiotlb_tbl_map_single() to take the DMA mapping attributes by
reference and update the direct callers accordingly.

This is a preparatory change for a follow-up patch which updates the
attributes based on the selected swiotlb pool. Keeping the signature change
separate makes the follow-up patch easier to review.

No functional change in this patch.

Signed-off-by: Aneesh Kumar K.V (Arm) <[email-masked]>
---
 drivers/iommu/dma-iommu.c | 2 +-
 drivers/xen/swiotlb-xen.c | 2 +-
 include/linux/swiotlb.h   | 2 +-
 kernel/dma/swiotlb.c      | 6 +++---
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index c2595bee3d41..725c7adb0a8d 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -1180,7 +1180,7 @@ static phys_addr_t iommu_dma_map_swiotlb(struct device *dev, phys_addr_t phys,
 	trace_swiotlb_bounced(dev, phys, size);
 
 	phys = swiotlb_tbl_map_single(dev, phys, size, iova_mask(iovad), dir,
-			attrs);
+				      &attrs);
 
 	/*
 	 * Untrusted devices should not see padding areas with random leftover
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 2cbf2b588f5b..8c4abe65cd49 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -243,7 +243,7 @@ static dma_addr_t xen_swiotlb_map_phys(struct device *dev, phys_addr_t phys,
 	 */
 	trace_swiotlb_bounced(dev, dev_addr, size);
 
-	map = swiotlb_tbl_map_single(dev, phys, size, 0, dir, attrs);
+	map = swiotlb_tbl_map_single(dev, phys, size, 0, dir, &attrs);
 	if (map == (phys_addr_t)DMA_MAPPING_ERROR)
 		return DMA_MAPPING_ERROR;
 
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 133bb8ca9032..29187cec90d8 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -238,7 +238,7 @@ static inline phys_addr_t default_swiotlb_limit(void)
 
 phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
 		size_t mapping_size, unsigned int alloc_aligned_mask,
-		enum dma_data_direction dir, unsigned long attrs);
+		enum dma_data_direction dir, unsigned long *attrs);
 dma_addr_t swiotlb_map(struct device *dev, phys_addr_t phys,
 		size_t size, enum dma_data_direction dir, unsigned long attrs);
 
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index be4d418d92ac..78ce05857c00 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -1391,7 +1391,7 @@ static unsigned long mem_used(struct io_tlb_mem *mem)
  */
 phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
 		size_t mapping_size, unsigned int alloc_align_mask,
-		enum dma_data_direction dir, unsigned long attrs)
+		enum dma_data_direction dir, unsigned long *attrs)
 {
 	struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
 	unsigned int offset;
@@ -1425,7 +1425,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
 	size = ALIGN(mapping_size + offset, alloc_align_mask + 1);
 	index = swiotlb_find_slots(dev, orig_addr, size, alloc_align_mask, &pool);
 	if (index == -1) {
-		if (!(attrs & DMA_ATTR_NO_WARN))
+		if (!(*attrs & DMA_ATTR_NO_WARN))
 			dev_warn_ratelimited(dev,
 	"swiotlb buffer is full (sz: %zd bytes), total %lu (slots), used %lu (slots)\n",
 				 size, mem->nslabs, mem_used(mem));
@@ -1604,7 +1604,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
 
 	trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size);
 
-	swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, 0, dir, attrs);
+	swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, 0, dir, &attrs);
 	if (swiotlb_addr == (phys_addr_t)DMA_MAPPING_ERROR)
 		return DMA_MAPPING_ERROR;
 
-- 
2.43.0