linux-kernel - [PATCH v4 08/14] iommufd/viommu: Add vdev_to

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Message-ID: <3eae567a6d674cae144c5fd36cc8eafe84d6a24d.1729555967.git.nicolinc@nvidia.com>
Date: Mon, 21 Oct 2024 17:20:17 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
	<robin.murphy@....com>, <dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>,
	<shuah@...nel.org>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
	<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
	<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
	<smostafa@...gle.com>, <yi.l.liu@...el.com>, <aik@....com>,
	<zhangfei.gao@...aro.org>, <patches@...ts.linux.dev>
Subject: [PATCH v4 08/14] iommufd/viommu: Add vdev_to_dev helper

This avoids a bigger trouble of moving the struct iommufd_device to the
public header.

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 include/linux/iommufd.h        | 6 ++++++
 drivers/iommu/iommufd/driver.c | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 559f274a26ea..2f4ec6e6df21 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -204,6 +204,7 @@ static inline int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx)
 struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
 					     size_t size,
 					     enum iommufd_object_type type);
+struct device *vdev_to_dev(struct iommufd_vdevice *vdev);
 #else /* !CONFIG_IOMMUFD_DRIVER */
 static inline struct iommufd_object *
 _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
@@ -211,6 +212,11 @@ _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size,
 {
 	return ERR_PTR(-EOPNOTSUPP);
 }
+
+static inline struct device *vdev_to_dev(struct iommufd_vdevice *vdev)
+{
+	return NULL;
+}
 #endif /* CONFIG_IOMMUFD_DRIVER */
 
 /*
diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c
index c0876d3f91c7..a5d750d2cfaa 100644
--- a/drivers/iommu/iommufd/driver.c
+++ b/drivers/iommu/iommufd/driver.c
@@ -36,3 +36,10 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
 	return ERR_PTR(rc);
 }
 EXPORT_SYMBOL_NS_GPL(_iommufd_object_alloc, IOMMUFD);
+
+/* Caller should xa_lock(&viommu->vdevs) to protect the return value */
+struct device *vdev_to_dev(struct iommufd_vdevice *vdev)
+{
+	return vdev ? vdev->idev->dev : NULL;
+}
+EXPORT_SYMBOL_NS_GPL(vdev_to_dev, IOMMUFD);
-- 
2.43.0