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1// SPDX-License-Identifier: GPL-2.0 OR MIT2/*3 * Copyright 2016-2021 Advanced Micro Devices, Inc.4 *5 * Permission is hereby granted, free of charge, to any person obtaining a6 * copy of this software and associated documentation files (the "Software"),7 * to deal in the Software without restriction, including without limitation8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,9 * and/or sell copies of the Software, and to permit persons to whom the10 * Software is furnished to do so, subject to the following conditions:11 *12 * The above copyright notice and this permission notice shall be included in13 * all copies or substantial portions of the Software.14 *15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR19 * 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 OR21 * OTHER DEALINGS IN THE SOFTWARE.22 *23 * Authors: Christian König, Felix Kuehling24 */25 26#include "amdgpu.h"27 28/**29 * DOC: mem_info_preempt_used30 *31 * The amdgpu driver provides a sysfs API for reporting current total amount of32 * used preemptible memory.33 * The file mem_info_preempt_used is used for this, and returns the current34 * used size of the preemptible block, in bytes35 */36static 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 47static DEVICE_ATTR_RO(mem_info_preempt_used);48 49/**50 * amdgpu_preempt_mgr_new - allocate a new node51 *52 * @man: TTM memory type manager53 * @tbo: TTM BO we need this range for54 * @place: placement flags and restrictions55 * @res: TTM memory object56 *57 * Dummy, just count the space used without allocating resources or any limit.58 */59static 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(sizeof(**res), GFP_KERNEL);65 if (!*res)66 return -ENOMEM;67 68 ttm_resource_init(tbo, place, *res);69 (*res)->start = AMDGPU_BO_INVALID_OFFSET;70 return 0;71}72 73/**74 * amdgpu_preempt_mgr_del - free ranges75 *76 * @man: TTM memory type manager77 * @res: TTM memory object78 *79 * Free the allocated GTT again.80 */81static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man,82 struct ttm_resource *res)83{84 ttm_resource_fini(man, res);85 kfree(res);86}87 88static 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 MM95 *96 * @adev: amdgpu_device pointer97 *98 * Allocate and initialize the GTT manager.99 */100int 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, &adev->mman.bdev, (1 << 30));109 110 ret = device_create_file(adev->dev, &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(&adev->mman.bdev, AMDGPU_PL_PREEMPT, man);117 ttm_resource_manager_set_used(man, true);118 return 0;119}120 121/**122 * amdgpu_preempt_mgr_fini - free and destroy GTT manager123 *124 * @adev: amdgpu_device pointer125 *126 * Destroy and free the GTT manager, returns -EBUSY if ranges are still127 * allocated inside it.128 */129void 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, false);135 136 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);137 if (ret)138 return;139 140 device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used);141 142 ttm_resource_manager_cleanup(man);143 ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL);144}145