1/* SPDX-License-Identifier: GPL-2.0-only */
 2/* Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES.
 3 */
 4#ifndef __LINUX_IOMMU_PRIV_H
 5#define __LINUX_IOMMU_PRIV_H
 6
 7#include <linux/iommu.h>
 8
 9static inline const struct iommu_ops *dev_iommu_ops(struct device *dev)
10{
11	/*
12	 * Assume that valid ops must be installed if iommu_probe_device()
13	 * has succeeded. The device ops are essentially for internal use
14	 * within the IOMMU subsystem itself, so we should be able to trust
15	 * ourselves not to misuse the helper.
16	 */
17	return dev->iommu->iommu_dev->ops;
18}
19
20const struct iommu_ops *iommu_ops_from_fwnode(const struct fwnode_handle *fwnode);
21
22static inline const struct iommu_ops *iommu_fwspec_ops(struct iommu_fwspec *fwspec)
23{
24	return iommu_ops_from_fwnode(fwspec ? fwspec->iommu_fwnode : NULL);
25}
26
27int iommu_group_replace_domain(struct iommu_group *group,
28			       struct iommu_domain *new_domain);
29
30int iommu_device_register_bus(struct iommu_device *iommu,
31			      const struct iommu_ops *ops,
32			      const struct bus_type *bus,
33			      struct notifier_block *nb);
34void iommu_device_unregister_bus(struct iommu_device *iommu,
35				 const struct bus_type *bus,
36				 struct notifier_block *nb);
37
38struct iommu_attach_handle *iommu_attach_handle_get(struct iommu_group *group,
39						    ioasid_t pasid,
40						    unsigned int type);
41int iommu_attach_group_handle(struct iommu_domain *domain,
42			      struct iommu_group *group,
43			      struct iommu_attach_handle *handle);
44void iommu_detach_group_handle(struct iommu_domain *domain,
45			       struct iommu_group *group);
46int iommu_replace_group_handle(struct iommu_group *group,
47			       struct iommu_domain *new_domain,
48			       struct iommu_attach_handle *handle);
49#endif /* __LINUX_IOMMU_PRIV_H */