1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /*
3  * Copyright 2016-2021 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  * Authors: Christian König, Felix Kuehling
24  */
25 
26 #include "amdgpu.h"
27 
28 static inline struct amdgpu_preempt_mgr *
29 to_preempt_mgr(struct ttm_resource_manager *man)
30 {
31 	return container_of(man, struct amdgpu_preempt_mgr, manager);
32 }
33 
34 /**
35  * DOC: mem_info_preempt_used
36  *
37  * The amdgpu driver provides a sysfs API for reporting current total amount of
38  * used preemptible memory.
39  * The file mem_info_preempt_used is used for this, and returns the current
40  * used size of the preemptible block, in bytes
41  */
42 static ssize_t mem_info_preempt_used_show(struct device *dev,
43 					  struct device_attribute *attr,
44 					  char *buf)
45 {
46 	struct drm_device *ddev = dev_get_drvdata(dev);
47 	struct amdgpu_device *adev = drm_to_adev(ddev);
48 	struct ttm_resource_manager *man;
49 
50 	man = ttm_manager_type(&adev->mman.bdev, AMDGPU_PL_PREEMPT);
51 	return sysfs_emit(buf, "%llu\n", amdgpu_preempt_mgr_usage(man));
52 }
53 
54 static DEVICE_ATTR_RO(mem_info_preempt_used);
55 
56 /**
57  * amdgpu_preempt_mgr_new - allocate a new node
58  *
59  * @man: TTM memory type manager
60  * @tbo: TTM BO we need this range for
61  * @place: placement flags and restrictions
62  * @mem: the resulting mem object
63  *
64  * Dummy, just count the space used without allocating resources or any limit.
65  */
66 static int amdgpu_preempt_mgr_new(struct ttm_resource_manager *man,
67 				  struct ttm_buffer_object *tbo,
68 				  const struct ttm_place *place,
69 				  struct ttm_resource *mem)
70 {
71 	struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
72 
73 	atomic64_add(mem->num_pages, &mgr->used);
74 
75 	mem->mm_node = NULL;
76 	mem->start = AMDGPU_BO_INVALID_OFFSET;
77 	return 0;
78 }
79 
80 /**
81  * amdgpu_preempt_mgr_del - free ranges
82  *
83  * @man: TTM memory type manager
84  * @mem: TTM memory object
85  *
86  * Free the allocated GTT again.
87  */
88 static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man,
89 				   struct ttm_resource *mem)
90 {
91 	struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
92 
93 	atomic64_sub(mem->num_pages, &mgr->used);
94 }
95 
96 /**
97  * amdgpu_preempt_mgr_usage - return usage of PREEMPT domain
98  *
99  * @man: TTM memory type manager
100  *
101  * Return how many bytes are used in the GTT domain
102  */
103 uint64_t amdgpu_preempt_mgr_usage(struct ttm_resource_manager *man)
104 {
105 	struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
106 	s64 result = atomic64_read(&mgr->used);
107 
108 	return (result > 0 ? result : 0) * PAGE_SIZE;
109 }
110 
111 /**
112  * amdgpu_preempt_mgr_debug - dump VRAM table
113  *
114  * @man: TTM memory type manager
115  * @printer: DRM printer to use
116  *
117  * Dump the table content using printk.
118  */
119 static void amdgpu_preempt_mgr_debug(struct ttm_resource_manager *man,
120 				     struct drm_printer *printer)
121 {
122 	struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
123 
124 	drm_printf(printer, "man size:%llu pages, preempt used:%lld pages\n",
125 		   man->size, (u64)atomic64_read(&mgr->used));
126 }
127 
128 static const struct ttm_resource_manager_func amdgpu_preempt_mgr_func = {
129 	.alloc = amdgpu_preempt_mgr_new,
130 	.free = amdgpu_preempt_mgr_del,
131 	.debug = amdgpu_preempt_mgr_debug
132 };
133 
134 /**
135  * amdgpu_preempt_mgr_init - init PREEMPT manager and DRM MM
136  *
137  * @adev: amdgpu_device pointer
138  *
139  * Allocate and initialize the GTT manager.
140  */
141 int amdgpu_preempt_mgr_init(struct amdgpu_device *adev)
142 {
143 	struct amdgpu_preempt_mgr *mgr = &adev->mman.preempt_mgr;
144 	struct ttm_resource_manager *man = &mgr->manager;
145 	int ret;
146 
147 	man->use_tt = true;
148 	man->func = &amdgpu_preempt_mgr_func;
149 
150 	ttm_resource_manager_init(man, (1 << 30));
151 
152 	atomic64_set(&mgr->used, 0);
153 
154 	ret = device_create_file(adev->dev, &dev_attr_mem_info_preempt_used);
155 	if (ret) {
156 		DRM_ERROR("Failed to create device file mem_info_preempt_used\n");
157 		return ret;
158 	}
159 
160 	ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT,
161 			       &mgr->manager);
162 	ttm_resource_manager_set_used(man, true);
163 	return 0;
164 }
165 
166 /**
167  * amdgpu_preempt_mgr_fini - free and destroy GTT manager
168  *
169  * @adev: amdgpu_device pointer
170  *
171  * Destroy and free the GTT manager, returns -EBUSY if ranges are still
172  * allocated inside it.
173  */
174 void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev)
175 {
176 	struct amdgpu_preempt_mgr *mgr = &adev->mman.preempt_mgr;
177 	struct ttm_resource_manager *man = &mgr->manager;
178 	int ret;
179 
180 	ttm_resource_manager_set_used(man, false);
181 
182 	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
183 	if (ret)
184 		return;
185 
186 	device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used);
187 
188 	ttm_resource_manager_cleanup(man);
189 	ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL);
190 }
191