linux-kernel - [PATCH v3 3/5] iommufd/vdevice: Remove struct device reference from struct vdevice

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Message-Id: <20250627033809.1730752-4-yilun.xu@linux.intel.com>
Date: Fri, 27 Jun 2025 11:38:07 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: jgg@...dia.com,
	jgg@...pe.ca,
	kevin.tian@...el.com,
	will@...nel.org,
	aneesh.kumar@...nel.org
Cc: iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	joro@...tes.org,
	robin.murphy@....com,
	shuah@...nel.org,
	nicolinc@...dia.com,
	aik@....com,
	dan.j.williams@...el.com,
	baolu.lu@...ux.intel.com,
	yilun.xu@...el.com
Subject: [PATCH v3 3/5] iommufd/vdevice: Remove struct device reference from struct vdevice

Remove struct device *dev from struct vdevice.

The dev pointer is the Plan B for vdevice to reference the physical
device. As now vdev->idev is added without refcounting concern, just
use vdev->idev->dev when needed.

Signed-off-by: Xu Yilun <yilun.xu@...ux.intel.com>
---
 drivers/iommu/iommufd/driver.c          | 4 ++--
 drivers/iommu/iommufd/iommufd_private.h | 1 -
 drivers/iommu/iommufd/viommu.c          | 3 ---
 3 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c
index 922cd1fe7ec2..942d402bba36 100644
--- a/drivers/iommu/iommufd/driver.c
+++ b/drivers/iommu/iommufd/driver.c
@@ -45,7 +45,7 @@ struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
 	lockdep_assert_held(&viommu->vdevs.xa_lock);
 
 	vdev = xa_load(&viommu->vdevs, vdev_id);
-	return vdev ? vdev->dev : NULL;
+	return vdev ? vdev->idev->dev : NULL;
 }
 EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_dev, "IOMMUFD");
 
@@ -62,7 +62,7 @@ int iommufd_viommu_get_vdev_id(struct iommufd_viommu *viommu,
 
 	xa_lock(&viommu->vdevs);
 	xa_for_each(&viommu->vdevs, index, vdev) {
-		if (vdev->dev == dev) {
+		if (vdev->idev->dev == dev) {
 			*vdev_id = vdev->id;
 			rc = 0;
 			break;
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index f58aa4439c53..3700193471db 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -628,7 +628,6 @@ struct iommufd_vdevice {
 	struct iommufd_object obj;
 	struct iommufd_ctx *ictx;
 	struct iommufd_viommu *viommu;
-	struct device *dev;
 	u64 id; /* per-vIOMMU virtual ID */
 	struct iommufd_device *idev;
 };
diff --git a/drivers/iommu/iommufd/viommu.c b/drivers/iommu/iommufd/viommu.c
index 632d1d7b8fd8..452a7a24d738 100644
--- a/drivers/iommu/iommufd/viommu.c
+++ b/drivers/iommu/iommufd/viommu.c
@@ -103,7 +103,6 @@ void iommufd_vdevice_abort(struct iommufd_object *obj)
 	/* xa_cmpxchg is okay to fail if alloc failed xa_cmpxchg previously */
 	xa_cmpxchg(&viommu->vdevs, vdev->id, vdev, NULL, GFP_KERNEL);
 	refcount_dec(&viommu->obj.users);
-	put_device(vdev->dev);
 	vdev->viommu = NULL;
 	idev->vdev = NULL;
 }
@@ -159,8 +158,6 @@ int iommufd_vdevice_alloc_ioctl(struct iommufd_ucmd *ucmd)
 	}
 
 	vdev->id = virt_id;
-	vdev->dev = idev->dev;
-	get_device(idev->dev);
 	vdev->viommu = viommu;
 	refcount_inc(&viommu->obj.users);
 	/*
-- 
2.25.1