linux-kernel - [PATCH v6 2/5] iommu: Tidy domain for iommu_setup_dma

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Message-ID: <513c71e739d0b9c515a0e7a45248e4a092567e79.1763512374.git.nicolinc@nvidia.com>
Date: Tue, 18 Nov 2025 16:52:08 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: <robin.murphy@....com>, <joro@...tes.org>, <afael@...nel.org>,
	<bhelgaas@...gle.com>, <alex@...zbot.org>, <jgg@...dia.com>,
	<kevin.tian@...el.com>
CC: <will@...nel.org>, <lenb@...nel.org>, <baolu.lu@...ux.intel.com>,
	<linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <kvm@...r.kernel.org>,
	<patches@...ts.linux.dev>, <pjaroszynski@...dia.com>, <vsethi@...dia.com>,
	<helgaas@...nel.org>, <etzhao1900@...il.com>
Subject: [PATCH v6 2/5] iommu: Tidy domain for iommu_setup_dma_ops()

This function can only be called on the default_domain. Trivally pass it
in. In all three existing cases, the default domain was just attached to
the device.

This avoids iommu_setup_dma_ops() calling iommu_get_domain_for_dev() that
will be used by external callers.

Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/dma-iommu.h | 5 +++--
 drivers/iommu/dma-iommu.c | 4 +---
 drivers/iommu/iommu.c     | 6 +++---
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/dma-iommu.h b/drivers/iommu/dma-iommu.h
index eca201c1f9639..040d002525632 100644
--- a/drivers/iommu/dma-iommu.h
+++ b/drivers/iommu/dma-iommu.h
@@ -9,7 +9,7 @@
 
 #ifdef CONFIG_IOMMU_DMA
 
-void iommu_setup_dma_ops(struct device *dev);
+void iommu_setup_dma_ops(struct device *dev, struct iommu_domain *domain);
 
 int iommu_get_dma_cookie(struct iommu_domain *domain);
 void iommu_put_dma_cookie(struct iommu_domain *domain);
@@ -26,7 +26,8 @@ extern bool iommu_dma_forcedac;
 
 #else /* CONFIG_IOMMU_DMA */
 
-static inline void iommu_setup_dma_ops(struct device *dev)
+static inline void iommu_setup_dma_ops(struct device *dev,
+				       struct iommu_domain *domain)
 {
 }
 
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 7944a3af4545e..e8ffb50c66dbf 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -2096,10 +2096,8 @@ void dma_iova_destroy(struct device *dev, struct dma_iova_state *state,
 }
 EXPORT_SYMBOL_GPL(dma_iova_destroy);
 
-void iommu_setup_dma_ops(struct device *dev)
+void iommu_setup_dma_ops(struct device *dev, struct iommu_domain *domain)
 {
-	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
-
 	if (dev_is_pci(dev))
 		dev->iommu->pci_32bit_workaround = !iommu_dma_forcedac;
 
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 170e522b5bda4..1e322f87b1710 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -661,7 +661,7 @@ static int __iommu_probe_device(struct device *dev, struct list_head *group_list
 	}
 
 	if (group->default_domain)
-		iommu_setup_dma_ops(dev);
+		iommu_setup_dma_ops(dev, group->default_domain);
 
 	mutex_unlock(&group->mutex);
 
@@ -1949,7 +1949,7 @@ static int bus_iommu_probe(const struct bus_type *bus)
 			return ret;
 		}
 		for_each_group_device(group, gdev)
-			iommu_setup_dma_ops(gdev->dev);
+			iommu_setup_dma_ops(gdev->dev, group->default_domain);
 		mutex_unlock(&group->mutex);
 
 		/*
@@ -3155,7 +3155,7 @@ static ssize_t iommu_group_store_type(struct iommu_group *group,
 
 	/* Make sure dma_ops is appropriatley set */
 	for_each_group_device(group, gdev)
-		iommu_setup_dma_ops(gdev->dev);
+		iommu_setup_dma_ops(gdev->dev, group->default_domain);
 
 out_unlock:
 	mutex_unlock(&group->mutex);
-- 
2.43.0