linux-kernel - [PATCH v2 01/10] iommu: Move dev_iommu

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Date:   Tue, 7 Feb 2023 13:17:53 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <jgg@...dia.com>, <kevin.tian@...el.com>, <joro@...tes.org>,
        <will@...nel.org>, <robin.murphy@....com>,
        <alex.williamson@...hat.com>, <shuah@...nel.org>
CC:     <yi.l.liu@...el.com>, <linux-kernel@...r.kernel.org>,
        <iommu@...ts.linux.dev>, <kvm@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>, <baolu.lu@...ux.intel.com>
Subject: [PATCH v2 01/10] iommu: Move dev_iommu_ops() to private header

From: Yi Liu <yi.l.liu@...el.com>

dev_iommu_ops() is essentially only used in iommu subsystem, so
move to a private header to avoid being abused by other drivers.

Suggested-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Yi Liu <yi.l.liu@...el.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/iommu-priv.h | 18 ++++++++++++++++++
 drivers/iommu/iommu.c      |  2 ++
 include/linux/iommu.h      | 11 -----------
 3 files changed, 20 insertions(+), 11 deletions(-)
 create mode 100644 drivers/iommu/iommu-priv.h

diff --git a/drivers/iommu/iommu-priv.h b/drivers/iommu/iommu-priv.h
new file mode 100644
index 000000000000..9e1497027cff
--- /dev/null
+++ b/drivers/iommu/iommu-priv.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __LINUX_IOMMU_PRIV_H
+#define __LINUX_IOMMU_PRIV_H
+
+#include <linux/iommu.h>
+
+static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
+{
+	/*
+	 * Assume that valid ops must be installed if iommu_probe_device()
+	 * has succeeded. The device ops are essentially for internal use
+	 * within the IOMMU subsystem itself, so we should be able to trust
+	 * ourselves not to misuse the helper.
+	 */
+	return dev->iommu->iommu_dev->ops;
+}
+#endif /* __LINUX_IOMMU_PRIV_H */
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 4b5a21ac5e88..a18b7f1a4e6e 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -35,6 +35,8 @@
 
 #include "iommu-sva.h"
 
+#include "iommu-priv.h"
+
 static struct kset *iommu_group_kset;
 static DEFINE_IDA(iommu_group_ida);
 
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index a8063f26ff69..cb586d054c57 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -445,17 +445,6 @@ static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather)
 	};
 }
 
-static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
-{
-	/*
-	 * Assume that valid ops must be installed if iommu_probe_device()
-	 * has succeeded. The device ops are essentially for internal use
-	 * within the IOMMU subsystem itself, so we should be able to trust
-	 * ourselves not to misuse the helper.
-	 */
-	return dev->iommu->iommu_dev->ops;
-}
-
 extern int bus_iommu_probe(struct bus_type *bus);
 extern bool iommu_present(struct bus_type *bus);
 extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
-- 
2.39.1