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 | /** |
29 | * DOC: mem_info_preempt_used |
30 | * |
31 | * The amdgpu driver provides a sysfs API for reporting current total amount of |
32 | * used preemptible memory. |
33 | * The file mem_info_preempt_used is used for this, and returns the current |
34 | * used size of the preemptible block, in bytes |
35 | */ |
36 | static ssize_t mem_info_preempt_used_show(struct device *dev, |
37 | struct device_attribute *attr, |
38 | char *buf) |
39 | { |
40 | struct drm_device *ddev = dev_get_drvdata(dev); |
41 | struct amdgpu_device *adev = drm_to_adev(ddev); |
42 | struct ttm_resource_manager *man = &adev->mman.preempt_mgr; |
43 | |
44 | return sysfs_emit(buf, fmt: "%llu\n" , ttm_resource_manager_usage(man)); |
45 | } |
46 | |
47 | static DEVICE_ATTR_RO(mem_info_preempt_used); |
48 | |
49 | /** |
50 | * amdgpu_preempt_mgr_new - allocate a new node |
51 | * |
52 | * @man: TTM memory type manager |
53 | * @tbo: TTM BO we need this range for |
54 | * @place: placement flags and restrictions |
55 | * @res: TTM memory object |
56 | * |
57 | * Dummy, just count the space used without allocating resources or any limit. |
58 | */ |
59 | static int amdgpu_preempt_mgr_new(struct ttm_resource_manager *man, |
60 | struct ttm_buffer_object *tbo, |
61 | const struct ttm_place *place, |
62 | struct ttm_resource **res) |
63 | { |
64 | *res = kzalloc(size: sizeof(**res), GFP_KERNEL); |
65 | if (!*res) |
66 | return -ENOMEM; |
67 | |
68 | ttm_resource_init(bo: tbo, place, res: *res); |
69 | (*res)->start = AMDGPU_BO_INVALID_OFFSET; |
70 | return 0; |
71 | } |
72 | |
73 | /** |
74 | * amdgpu_preempt_mgr_del - free ranges |
75 | * |
76 | * @man: TTM memory type manager |
77 | * @res: TTM memory object |
78 | * |
79 | * Free the allocated GTT again. |
80 | */ |
81 | static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man, |
82 | struct ttm_resource *res) |
83 | { |
84 | ttm_resource_fini(man, res); |
85 | kfree(objp: res); |
86 | } |
87 | |
88 | static const struct ttm_resource_manager_func amdgpu_preempt_mgr_func = { |
89 | .alloc = amdgpu_preempt_mgr_new, |
90 | .free = amdgpu_preempt_mgr_del, |
91 | }; |
92 | |
93 | /** |
94 | * amdgpu_preempt_mgr_init - init PREEMPT manager and DRM MM |
95 | * |
96 | * @adev: amdgpu_device pointer |
97 | * |
98 | * Allocate and initialize the GTT manager. |
99 | */ |
100 | int amdgpu_preempt_mgr_init(struct amdgpu_device *adev) |
101 | { |
102 | struct ttm_resource_manager *man = &adev->mman.preempt_mgr; |
103 | int ret; |
104 | |
105 | man->use_tt = true; |
106 | man->func = &amdgpu_preempt_mgr_func; |
107 | |
108 | ttm_resource_manager_init(man, bdev: &adev->mman.bdev, size: (1 << 30)); |
109 | |
110 | ret = device_create_file(device: adev->dev, entry: &dev_attr_mem_info_preempt_used); |
111 | if (ret) { |
112 | DRM_ERROR("Failed to create device file mem_info_preempt_used\n" ); |
113 | return ret; |
114 | } |
115 | |
116 | ttm_set_driver_manager(bdev: &adev->mman.bdev, AMDGPU_PL_PREEMPT, manager: man); |
117 | ttm_resource_manager_set_used(man, used: true); |
118 | return 0; |
119 | } |
120 | |
121 | /** |
122 | * amdgpu_preempt_mgr_fini - free and destroy GTT manager |
123 | * |
124 | * @adev: amdgpu_device pointer |
125 | * |
126 | * Destroy and free the GTT manager, returns -EBUSY if ranges are still |
127 | * allocated inside it. |
128 | */ |
129 | void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev) |
130 | { |
131 | struct ttm_resource_manager *man = &adev->mman.preempt_mgr; |
132 | int ret; |
133 | |
134 | ttm_resource_manager_set_used(man, used: false); |
135 | |
136 | ret = ttm_resource_manager_evict_all(bdev: &adev->mman.bdev, man); |
137 | if (ret) |
138 | return; |
139 | |
140 | device_remove_file(dev: adev->dev, attr: &dev_attr_mem_info_preempt_used); |
141 | |
142 | ttm_resource_manager_cleanup(man); |
143 | ttm_set_driver_manager(bdev: &adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL); |
144 | } |
145 | |