linux-kernel - [PATCH v1 2/4] iommu: Add iommu_default_domain

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Message-ID: <64511b5e5b2771e223799b92db40bee71e962b56.1740600272.git.nicolinc@nvidia.com>
Date: Wed, 26 Feb 2025 12:16:05 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: <robin.murphy@....com>, <joro@...tes.org>, <will@...nel.org>,
	<alex.williamson@...hat.com>
CC: <jgg@...dia.com>, <iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<kvm@...r.kernel.org>
Subject: [PATCH v1 2/4] iommu: Add iommu_default_domain_free helper

The iommu_put_dma_cookie() will be moved out of iommu_domain_free(). For a
default domain, iommu_put_dma_cookie() can be simply added to this helper.

Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/iommu.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 022bf96a18c5..28cde7007cd7 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -456,6 +456,11 @@ static int iommu_init_device(struct device *dev, const struct iommu_ops *ops)
 	return ret;
 }
 
+static void iommu_default_domain_free(struct iommu_domain *domain)
+{
+	iommu_domain_free(domain);
+}
+
 static void iommu_deinit_device(struct device *dev)
 {
 	struct iommu_group *group = dev->iommu_group;
@@ -494,7 +499,7 @@ static void iommu_deinit_device(struct device *dev)
 	 */
 	if (list_empty(&group->devices)) {
 		if (group->default_domain) {
-			iommu_domain_free(group->default_domain);
+			iommu_default_domain_free(group->default_domain);
 			group->default_domain = NULL;
 		}
 		if (group->blocking_domain) {
@@ -3000,7 +3005,7 @@ static int iommu_setup_default_domain(struct iommu_group *group,
 
 out_free_old:
 	if (old_dom)
-		iommu_domain_free(old_dom);
+		iommu_default_domain_free(old_dom);
 	return ret;
 
 err_restore_domain:
@@ -3009,7 +3014,7 @@ static int iommu_setup_default_domain(struct iommu_group *group,
 			group, old_dom, IOMMU_SET_DOMAIN_MUST_SUCCEED);
 err_restore_def_domain:
 	if (old_dom) {
-		iommu_domain_free(dom);
+		iommu_default_domain_free(dom);
 		group->default_domain = old_dom;
 	}
 	return ret;
-- 
2.43.0