// SPDX-License-Identifier: GPL-2.0 OR MIT/* * Copyright 2016-2021 Advanced Micro Devices, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Christian König, Felix Kuehling */ #include "amdgpu.h" /** * DOC: mem_info_preempt_used * * The amdgpu driver provides a sysfs API for reporting current total amount of * used preemptible memory. * The file mem_info_preempt_used is used for this, and returns the current * used size of the preemptible block, in bytes */static ssize_t mem_info_preempt_used_show(struct device *dev,					  struct device_attribute *attr,					  char *buf){	struct drm_device *ddev = dev_get_drvdata(dev);	struct amdgpu_device *adev = drm_to_adev(ddev);	struct ttm_resource_manager *man = &adev->mman.preempt_mgr; 	return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));} static DEVICE_ATTR_RO(mem_info_preempt_used); /** * amdgpu_preempt_mgr_sysfs_fini - remove PREEMPT manager sysfs attributes * * @adev: amdgpu_device pointer */void amdgpu_preempt_mgr_sysfs_fini(struct amdgpu_device *adev){	if (adev->dev->kobj.sd)		device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used);} /** * amdgpu_preempt_mgr_new - allocate a new node * * @man: TTM memory type manager * @tbo: TTM BO we need this range for * @place: placement flags and restrictions * @res: TTM memory object * * Dummy, just count the space used without allocating resources or any limit. */static int amdgpu_preempt_mgr_new(struct ttm_resource_manager *man,				  struct ttm_buffer_object *tbo,				  const struct ttm_place *place,				  struct ttm_resource **res){	*res = kzalloc_obj(**res);	if (!*res)		return -ENOMEM; 	ttm_resource_init(tbo, place, *res);	(*res)->start = AMDGPU_BO_INVALID_OFFSET;	return 0;} /** * amdgpu_preempt_mgr_del - free ranges * * @man: TTM memory type manager * @res: TTM memory object * * Free the allocated GTT again. */static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man,				   struct ttm_resource *res){	ttm_resource_fini(man, res);	kfree(res);} static const struct ttm_resource_manager_func amdgpu_preempt_mgr_func = {	.alloc = amdgpu_preempt_mgr_new,	.free = amdgpu_preempt_mgr_del,}; /** * amdgpu_preempt_mgr_init - init PREEMPT manager and DRM MM * * @adev: amdgpu_device pointer * * Allocate and initialize the GTT manager. */int amdgpu_preempt_mgr_init(struct amdgpu_device *adev){	struct ttm_resource_manager *man = &adev->mman.preempt_mgr;	int ret; 	man->use_tt = true;	man->func = &amdgpu_preempt_mgr_func; 	ttm_resource_manager_init(man, &adev->mman.bdev, (1 << 30)); 	ret = device_create_file(adev->dev, &dev_attr_mem_info_preempt_used);	if (ret) {		DRM_ERROR("Failed to create device file mem_info_preempt_used\n");		return ret;	} 	ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, man);	ttm_resource_manager_set_used(man, true);	return 0;} /** * amdgpu_preempt_mgr_fini - free and destroy GTT manager * * @adev: amdgpu_device pointer * * Destroy and free the GTT manager, returns -EBUSY if ranges are still * allocated inside it. */void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev){	struct ttm_resource_manager *man = &adev->mman.preempt_mgr;	int ret; 	ttm_resource_manager_set_used(man, false); 	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);	if (ret)		return; 	ttm_resource_manager_cleanup(man);	ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL);}