1 /*
2  * Copyright 2021 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 
24 #include "amdgpu_reset.h"
25 #include "aldebaran.h"
26 
27 int amdgpu_reset_add_handler(struct amdgpu_reset_control *reset_ctl,
28 			     struct amdgpu_reset_handler *handler)
29 {
30 	/* TODO: Check if handler exists? */
31 	list_add_tail(&handler->handler_list, &reset_ctl->reset_handlers);
32 	return 0;
33 }
34 
35 int amdgpu_reset_init(struct amdgpu_device *adev)
36 {
37 	int ret = 0;
38 
39 	switch (adev->ip_versions[MP1_HWIP][0]) {
40 	case IP_VERSION(13, 0, 2):
41 		ret = aldebaran_reset_init(adev);
42 		break;
43 	default:
44 		break;
45 	}
46 
47 	return ret;
48 }
49 
50 int amdgpu_reset_fini(struct amdgpu_device *adev)
51 {
52 	int ret = 0;
53 
54 	switch (adev->ip_versions[MP1_HWIP][0]) {
55 	case IP_VERSION(13, 0, 2):
56 		ret = aldebaran_reset_fini(adev);
57 		break;
58 	default:
59 		break;
60 	}
61 
62 	return ret;
63 }
64 
65 int amdgpu_reset_prepare_hwcontext(struct amdgpu_device *adev,
66 				   struct amdgpu_reset_context *reset_context)
67 {
68 	struct amdgpu_reset_handler *reset_handler = NULL;
69 
70 	if (adev->reset_cntl && adev->reset_cntl->get_reset_handler)
71 		reset_handler = adev->reset_cntl->get_reset_handler(
72 			adev->reset_cntl, reset_context);
73 	if (!reset_handler)
74 		return -ENOSYS;
75 
76 	return reset_handler->prepare_hwcontext(adev->reset_cntl,
77 						reset_context);
78 }
79 
80 int amdgpu_reset_perform_reset(struct amdgpu_device *adev,
81 			       struct amdgpu_reset_context *reset_context)
82 {
83 	int ret;
84 	struct amdgpu_reset_handler *reset_handler = NULL;
85 
86 	if (adev->reset_cntl)
87 		reset_handler = adev->reset_cntl->get_reset_handler(
88 			adev->reset_cntl, reset_context);
89 	if (!reset_handler)
90 		return -ENOSYS;
91 
92 	ret = reset_handler->perform_reset(adev->reset_cntl, reset_context);
93 	if (ret)
94 		return ret;
95 
96 	return reset_handler->restore_hwcontext(adev->reset_cntl,
97 						reset_context);
98 }
99 
100 
101 void amdgpu_reset_destroy_reset_domain(struct kref *ref)
102 {
103 	struct amdgpu_reset_domain *reset_domain = container_of(ref,
104 								struct amdgpu_reset_domain,
105 								refcount);
106 	if (reset_domain->wq)
107 		destroy_workqueue(reset_domain->wq);
108 
109 	kvfree(reset_domain);
110 }
111 
112 struct amdgpu_reset_domain *amdgpu_reset_create_reset_domain(enum amdgpu_reset_domain_type type,
113 							     char *wq_name)
114 {
115 	struct amdgpu_reset_domain *reset_domain;
116 
117 	reset_domain = kvzalloc(sizeof(struct amdgpu_reset_domain), GFP_KERNEL);
118 	if (!reset_domain) {
119 		DRM_ERROR("Failed to allocate amdgpu_reset_domain!");
120 		return NULL;
121 	}
122 
123 	reset_domain->type = type;
124 	kref_init(&reset_domain->refcount);
125 
126 	reset_domain->wq = create_singlethread_workqueue(wq_name);
127 	if (!reset_domain->wq) {
128 		DRM_ERROR("Failed to allocate wq for amdgpu_reset_domain!");
129 		amdgpu_reset_put_reset_domain(reset_domain);
130 		return NULL;
131 
132 	}
133 
134 	atomic_set(&reset_domain->in_gpu_reset, 0);
135 	init_rwsem(&reset_domain->sem);
136 
137 	return reset_domain;
138 }
139 
140 void amdgpu_device_lock_reset_domain(struct amdgpu_reset_domain *reset_domain)
141 {
142 	atomic_set(&reset_domain->in_gpu_reset, 1);
143 	down_write(&reset_domain->sem);
144 }
145 
146 
147 void amdgpu_device_unlock_reset_domain(struct amdgpu_reset_domain *reset_domain)
148 {
149 	atomic_set(&reset_domain->in_gpu_reset, 0);
150 	up_write(&reset_domain->sem);
151 }
152 
153 
154 
155