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 *
to_preempt_mgr(struct ttm_resource_manager * man)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 */
mem_info_preempt_used_show(struct device * dev,struct device_attribute * attr,char * buf)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 */
amdgpu_preempt_mgr_new(struct ttm_resource_manager * man,struct ttm_buffer_object * tbo,const struct ttm_place * place,struct ttm_resource ** res)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 **res)
70 {
71 struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
72
73 *res = kzalloc(sizeof(**res), GFP_KERNEL);
74 if (!*res)
75 return -ENOMEM;
76
77 ttm_resource_init(tbo, place, *res);
78 (*res)->start = AMDGPU_BO_INVALID_OFFSET;
79
80 atomic64_add((*res)->num_pages, &mgr->used);
81 return 0;
82 }
83
84 /**
85 * amdgpu_preempt_mgr_del - free ranges
86 *
87 * @man: TTM memory type manager
88 * @mem: TTM memory object
89 *
90 * Free the allocated GTT again.
91 */
amdgpu_preempt_mgr_del(struct ttm_resource_manager * man,struct ttm_resource * res)92 static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man,
93 struct ttm_resource *res)
94 {
95 struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
96
97 atomic64_sub(res->num_pages, &mgr->used);
98 kfree(res);
99 }
100
101 /**
102 * amdgpu_preempt_mgr_usage - return usage of PREEMPT domain
103 *
104 * @man: TTM memory type manager
105 *
106 * Return how many bytes are used in the GTT domain
107 */
amdgpu_preempt_mgr_usage(struct ttm_resource_manager * man)108 uint64_t amdgpu_preempt_mgr_usage(struct ttm_resource_manager *man)
109 {
110 struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
111 s64 result = atomic64_read(&mgr->used);
112
113 return (result > 0 ? result : 0) * PAGE_SIZE;
114 }
115
116 /**
117 * amdgpu_preempt_mgr_debug - dump VRAM table
118 *
119 * @man: TTM memory type manager
120 * @printer: DRM printer to use
121 *
122 * Dump the table content using printk.
123 */
amdgpu_preempt_mgr_debug(struct ttm_resource_manager * man,struct drm_printer * printer)124 static void amdgpu_preempt_mgr_debug(struct ttm_resource_manager *man,
125 struct drm_printer *printer)
126 {
127 struct amdgpu_preempt_mgr *mgr = to_preempt_mgr(man);
128
129 drm_printf(printer, "man size:%llu pages, preempt used:%lld pages\n",
130 man->size, (u64)atomic64_read(&mgr->used));
131 }
132
133 static const struct ttm_resource_manager_func amdgpu_preempt_mgr_func = {
134 .alloc = amdgpu_preempt_mgr_new,
135 .free = amdgpu_preempt_mgr_del,
136 .debug = amdgpu_preempt_mgr_debug
137 };
138
139 /**
140 * amdgpu_preempt_mgr_init - init PREEMPT manager and DRM MM
141 *
142 * @adev: amdgpu_device pointer
143 *
144 * Allocate and initialize the GTT manager.
145 */
amdgpu_preempt_mgr_init(struct amdgpu_device * adev)146 int amdgpu_preempt_mgr_init(struct amdgpu_device *adev)
147 {
148 struct amdgpu_preempt_mgr *mgr = &adev->mman.preempt_mgr;
149 struct ttm_resource_manager *man = &mgr->manager;
150 int ret;
151
152 man->use_tt = true;
153 man->func = &amdgpu_preempt_mgr_func;
154
155 ttm_resource_manager_init(man, (1 << 30));
156
157 atomic64_set(&mgr->used, 0);
158
159 ret = device_create_file(adev->dev, &dev_attr_mem_info_preempt_used);
160 if (ret) {
161 DRM_ERROR("Failed to create device file mem_info_preempt_used\n");
162 return ret;
163 }
164
165 ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT,
166 &mgr->manager);
167 ttm_resource_manager_set_used(man, true);
168 return 0;
169 }
170
171 /**
172 * amdgpu_preempt_mgr_fini - free and destroy GTT manager
173 *
174 * @adev: amdgpu_device pointer
175 *
176 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
177 * allocated inside it.
178 */
amdgpu_preempt_mgr_fini(struct amdgpu_device * adev)179 void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev)
180 {
181 struct amdgpu_preempt_mgr *mgr = &adev->mman.preempt_mgr;
182 struct ttm_resource_manager *man = &mgr->manager;
183 int ret;
184
185 ttm_resource_manager_set_used(man, false);
186
187 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
188 if (ret)
189 return;
190
191 device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used);
192
193 ttm_resource_manager_cleanup(man);
194 ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL);
195 }
196