1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
 2/*
 3 * Copyright 2018-2022 Advanced Micro Devices, Inc.
 4 *
 5 * Permission is hereby granted, free of charge, to any person obtaining a
 6 * copy of this software and associated documentation files (the "Software"),
 7 * to deal in the Software without restriction, including without limitation
 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
21 * OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24#ifndef __KFD_IOMMU_H__
25#define __KFD_IOMMU_H__
26
27#include <linux/kconfig.h>
28
29#if IS_REACHABLE(CONFIG_AMD_IOMMU_V2)
30
31#define KFD_SUPPORT_IOMMU_V2
32
33int kfd_iommu_check_device(struct kfd_dev *kfd);
34int kfd_iommu_device_init(struct kfd_dev *kfd);
35
36int kfd_iommu_bind_process_to_device(struct kfd_process_device *pdd);
37void kfd_iommu_unbind_process(struct kfd_process *p);
38
39void kfd_iommu_suspend(struct kfd_dev *kfd);
40int kfd_iommu_resume(struct kfd_dev *kfd);
41
42int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev);
43
44#else
45
46static inline int kfd_iommu_check_device(struct kfd_dev *kfd)
47{
48	return -ENODEV;
49}
50static inline int kfd_iommu_device_init(struct kfd_dev *kfd)
51{
52#if IS_MODULE(CONFIG_AMD_IOMMU_V2)
53	WARN_ONCE(1, "iommu_v2 module is not usable by built-in KFD");
54#endif
55	return 0;
56}
57
58static inline int kfd_iommu_bind_process_to_device(
59	struct kfd_process_device *pdd)
60{
61	return 0;
62}
63static inline void kfd_iommu_unbind_process(struct kfd_process *p)
64{
65	/* empty */
66}
67
68static inline void kfd_iommu_suspend(struct kfd_dev *kfd)
69{
70	/* empty */
71}
72static inline int kfd_iommu_resume(struct kfd_dev *kfd)
73{
74	return 0;
75}
76
77static inline int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev)
78{
79	return 0;
80}
81
82#endif /* IS_REACHABLE(CONFIG_AMD_IOMMU_V2) */
83
84#endif /* __KFD_IOMMU_H__ */