[PATCH 1/2] ARM: dma-mapping: Pass device to arm_iommu_create_mapping()

[Lu Baolu <baolu.lu@linux.intel.com>]

From: Robin Murphy <robin.murphy@arm.com>

All users of ARM IOMMU mappings create them for a particular device, so
change the interface to accept the device rather than forcing a vague
indirection through a bus type. This prepares for making a similar
change to iommu_domain_alloc() itself.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20240610085555.88197-17-baolu.lu@linux.intel.com
---
 arch/arm/include/asm/dma-iommu.h         | 2 +-
 arch/arm/mm/dma-mapping.c                | 8 ++++----
 drivers/gpu/drm/exynos/exynos_drm_dma.c  | 2 +-
 drivers/iommu/ipmmu-vmsa.c               | 3 +--
 drivers/iommu/mtk_iommu_v1.c             | 3 +--
 drivers/media/platform/ti/omap3isp/isp.c | 2 +-
 6 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
index 82ec1ccf1fee..2ce4c5683e6d 100644
--- a/arch/arm/include/asm/dma-iommu.h
+++ b/arch/arm/include/asm/dma-iommu.h
@@ -24,7 +24,7 @@ struct dma_iommu_mapping {
 };
 
 struct dma_iommu_mapping *
-arm_iommu_create_mapping(const struct bus_type *bus, dma_addr_t base, u64 size);
+arm_iommu_create_mapping(struct device *dev, dma_addr_t base, u64 size);
 
 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
 
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 5adf1769eee4..52f9c56cc3cb 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1532,7 +1532,7 @@ static const struct dma_map_ops iommu_ops = {
 
 /**
  * arm_iommu_create_mapping
- * @bus: pointer to the bus holding the client device (for IOMMU calls)
+ * @dev: pointer to the client device (for IOMMU calls)
  * @base: start address of the valid IO address space
  * @size: maximum size of the valid IO address space
  *
@@ -1544,7 +1544,7 @@ static const struct dma_map_ops iommu_ops = {
  * arm_iommu_attach_device function.
  */
 struct dma_iommu_mapping *
-arm_iommu_create_mapping(const struct bus_type *bus, dma_addr_t base, u64 size)
+arm_iommu_create_mapping(struct device *dev, dma_addr_t base, u64 size)
 {
 	unsigned int bits = size >> PAGE_SHIFT;
 	unsigned int bitmap_size = BITS_TO_LONGS(bits) * sizeof(long);
@@ -1585,7 +1585,7 @@ arm_iommu_create_mapping(const struct bus_type *bus, dma_addr_t base, u64 size)
 
 	spin_lock_init(&mapping->lock);
 
-	mapping->domain = iommu_domain_alloc(bus);
+	mapping->domain = iommu_domain_alloc(dev->bus);
 	if (!mapping->domain)
 		goto err4;
 
@@ -1718,7 +1718,7 @@ static void arm_setup_iommu_dma_ops(struct device *dev)
 		dma_base = dma_range_map_min(dev->dma_range_map);
 		size = dma_range_map_max(dev->dma_range_map) - dma_base;
 	}
-	mapping = arm_iommu_create_mapping(dev->bus, dma_base, size);
+	mapping = arm_iommu_create_mapping(dev, dma_base, size);
 	if (IS_ERR(mapping)) {
 		pr_warn("Failed to create %llu-byte IOMMU mapping for device %s\n",
 				size, dev_name(dev));
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c b/drivers/gpu/drm/exynos/exynos_drm_dma.c
index e2c7373f20c6..6a6761935224 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dma.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c
@@ -110,7 +110,7 @@ int exynos_drm_register_dma(struct drm_device *drm, struct device *dev,
 		void *mapping = NULL;
 
 		if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU))
-			mapping = arm_iommu_create_mapping(&platform_bus_type,
+			mapping = arm_iommu_create_mapping(dev,
 				EXYNOS_DEV_ADDR_START, EXYNOS_DEV_ADDR_SIZE);
 		else if (IS_ENABLED(CONFIG_IOMMU_DMA))
 			mapping = iommu_get_domain_for_dev(priv->dma_dev);
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index b657cc09605f..ff55b8c30712 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -804,8 +804,7 @@ static int ipmmu_init_arm_mapping(struct device *dev)
 	if (!mmu->mapping) {
 		struct dma_iommu_mapping *mapping;
 
-		mapping = arm_iommu_create_mapping(&platform_bus_type,
-						   SZ_1G, SZ_2G);
+		mapping = arm_iommu_create_mapping(dev, SZ_1G, SZ_2G);
 		if (IS_ERR(mapping)) {
 			dev_err(mmu->dev, "failed to create ARM IOMMU mapping\n");
 			ret = PTR_ERR(mapping);
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index c6ea5b4baff3..ee4e55b6b190 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -433,8 +433,7 @@ static int mtk_iommu_v1_create_mapping(struct device *dev,
 	mtk_mapping = data->mapping;
 	if (!mtk_mapping) {
 		/* MTK iommu support 4GB iova address space. */
-		mtk_mapping = arm_iommu_create_mapping(&platform_bus_type,
-						0, 1ULL << 32);
+		mtk_mapping = arm_iommu_create_mapping(dev, 0, 1ULL << 32);
 		if (IS_ERR(mtk_mapping))
 			return PTR_ERR(mtk_mapping);
 
diff --git a/drivers/media/platform/ti/omap3isp/isp.c b/drivers/media/platform/ti/omap3isp/isp.c
index 1cda23244c7b..91101ba88ef0 100644
--- a/drivers/media/platform/ti/omap3isp/isp.c
+++ b/drivers/media/platform/ti/omap3isp/isp.c
@@ -1965,7 +1965,7 @@ static int isp_attach_iommu(struct isp_device *isp)
 	 * Create the ARM mapping, used by the ARM DMA mapping core to allocate
 	 * VAs. This will allocate a corresponding IOMMU domain.
 	 */
-	mapping = arm_iommu_create_mapping(&platform_bus_type, SZ_1G, SZ_2G);
+	mapping = arm_iommu_create_mapping(isp->dev, SZ_1G, SZ_2G);
 	if (IS_ERR(mapping)) {
 		dev_err(isp->dev, "failed to create ARM IOMMU mapping\n");
 		return PTR_ERR(mapping);
-- 
2.34.1