1/*
 2 * Copyright 2018 Advanced Micro Devices, Inc.
 3 *
 4 * Permission is hereby granted, free of charge, to any person obtaining a
 5 * copy of this software and associated documentation files (the "Software"),
 6 * to deal in the Software without restriction, including without limitation
 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 8 * and/or sell copies of the Software, and to permit persons to whom the
 9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 */
22
23#ifndef __KFD_IOMMU_H__
24#define __KFD_IOMMU_H__
25
26#include <linux/kconfig.h>
27
28#if IS_REACHABLE(CONFIG_AMD_IOMMU_V2)
29
30#define KFD_SUPPORT_IOMMU_V2
31
32int kfd_iommu_check_device(struct kfd_dev *kfd);
33int kfd_iommu_device_init(struct kfd_dev *kfd);
34
35int kfd_iommu_bind_process_to_device(struct kfd_process_device *pdd);
36void kfd_iommu_unbind_process(struct kfd_process *p);
37
38void kfd_iommu_suspend(struct kfd_dev *kfd);
39int kfd_iommu_resume(struct kfd_dev *kfd);
40
41int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev);
42
43#else
44
45static inline int kfd_iommu_check_device(struct kfd_dev *kfd)
46{
47	return -ENODEV;
48}
49static inline int kfd_iommu_device_init(struct kfd_dev *kfd)
50{
51#if IS_MODULE(CONFIG_AMD_IOMMU_V2)
52	WARN_ONCE(1, "iommu_v2 module is not usable by built-in KFD");
53#endif
54	return 0;
55}
56
57static inline int kfd_iommu_bind_process_to_device(
58	struct kfd_process_device *pdd)
59{
60	return 0;
61}
62static inline void kfd_iommu_unbind_process(struct kfd_process *p)
63{
64	/* empty */
65}
66
67static inline void kfd_iommu_suspend(struct kfd_dev *kfd)
68{
69	/* empty */
70}
71static inline int kfd_iommu_resume(struct kfd_dev *kfd)
72{
73	return 0;
74}
75
76static inline int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev)
77{
78	return 0;
79}
80
81#endif /* IS_REACHABLE(CONFIG_AMD_IOMMU_V2) */
82
83#endif /* __KFD_IOMMU_H__ */