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, "%llu\n", ttm_resource_manager_usage(man)); 45 } 46 47 static DEVICE_ATTR_RO(mem_info_preempt_used); 48 49 /** 50 * amdgpu_preempt_mgr_sysfs_fini - remove PREEMPT manager sysfs attributes 51 * 52 * @adev: amdgpu_device pointer 53 */ 54 void amdgpu_preempt_mgr_sysfs_fini(struct amdgpu_device *adev) 55 { 56 if (adev->dev->kobj.sd) 57 device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used); 58 } 59 60 /** 61 * amdgpu_preempt_mgr_new - allocate a new node 62 * 63 * @man: TTM memory type manager 64 * @tbo: TTM BO we need this range for 65 * @place: placement flags and restrictions 66 * @res: TTM memory object 67 * 68 * Dummy, just count the space used without allocating resources or any limit. 69 */ 70 static int amdgpu_preempt_mgr_new(struct ttm_resource_manager *man, 71 struct ttm_buffer_object *tbo, 72 const struct ttm_place *place, 73 struct ttm_resource **res) 74 { 75 *res = kzalloc_obj(**res); 76 if (!*res) 77 return -ENOMEM; 78 79 ttm_resource_init(tbo, place, *res); 80 (*res)->start = AMDGPU_BO_INVALID_OFFSET; 81 return 0; 82 } 83 84 /** 85 * amdgpu_preempt_mgr_del - free ranges 86 * 87 * @man: TTM memory type manager 88 * @res: TTM memory object 89 * 90 * Free the allocated GTT again. 91 */ 92 static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man, 93 struct ttm_resource *res) 94 { 95 ttm_resource_fini(man, res); 96 kfree(res); 97 } 98 99 static const struct ttm_resource_manager_func amdgpu_preempt_mgr_func = { 100 .alloc = amdgpu_preempt_mgr_new, 101 .free = amdgpu_preempt_mgr_del, 102 }; 103 104 /** 105 * amdgpu_preempt_mgr_init - init PREEMPT manager and DRM MM 106 * 107 * @adev: amdgpu_device pointer 108 * 109 * Allocate and initialize the GTT manager. 110 */ 111 int amdgpu_preempt_mgr_init(struct amdgpu_device *adev) 112 { 113 struct ttm_resource_manager *man = &adev->mman.preempt_mgr; 114 int ret; 115 116 man->use_tt = true; 117 man->func = &amdgpu_preempt_mgr_func; 118 119 ttm_resource_manager_init(man, &adev->mman.bdev, (1 << 30)); 120 121 ret = device_create_file(adev->dev, &dev_attr_mem_info_preempt_used); 122 if (ret) { 123 DRM_ERROR("Failed to create device file mem_info_preempt_used\n"); 124 return ret; 125 } 126 127 ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, man); 128 ttm_resource_manager_set_used(man, true); 129 return 0; 130 } 131 132 /** 133 * amdgpu_preempt_mgr_fini - free and destroy GTT manager 134 * 135 * @adev: amdgpu_device pointer 136 * 137 * Destroy and free the GTT manager, returns -EBUSY if ranges are still 138 * allocated inside it. 139 */ 140 void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev) 141 { 142 struct ttm_resource_manager *man = &adev->mman.preempt_mgr; 143 int ret; 144 145 ttm_resource_manager_set_used(man, false); 146 147 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man); 148 if (ret) 149 return; 150 151 ttm_resource_manager_cleanup(man); 152 ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL); 153 } 154