Line data    Source code

       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           0 : static ssize_t mem_info_preempt_used_show(struct device *dev,
      37             :                                           struct device_attribute *attr,
      38             :                                           char *buf)
      39             : {
      40           0 :         struct drm_device *ddev = dev_get_drvdata(dev);
      41           0 :         struct amdgpu_device *adev = drm_to_adev(ddev);
      42           0 :         struct ttm_resource_manager *man = &adev->mman.preempt_mgr;
      43             : 
      44           0 :         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_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           0 : 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           0 :         *res = kzalloc(sizeof(**res), GFP_KERNEL);
      65           0 :         if (!*res)
      66             :                 return -ENOMEM;
      67             : 
      68           0 :         ttm_resource_init(tbo, place, *res);
      69           0 :         (*res)->start = AMDGPU_BO_INVALID_OFFSET;
      70           0 :         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           0 : static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man,
      82             :                                    struct ttm_resource *res)
      83             : {
      84           0 :         ttm_resource_fini(man, res);
      85           0 :         kfree(res);
      86           0 : }
      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           0 : int amdgpu_preempt_mgr_init(struct amdgpu_device *adev)
     101             : {
     102           0 :         struct ttm_resource_manager *man = &adev->mman.preempt_mgr;
     103             :         int ret;
     104             : 
     105           0 :         man->use_tt = true;
     106           0 :         man->func = &amdgpu_preempt_mgr_func;
     107             : 
     108           0 :         ttm_resource_manager_init(man, &adev->mman.bdev, (1 << 30));
     109             : 
     110           0 :         ret = device_create_file(adev->dev, &dev_attr_mem_info_preempt_used);
     111           0 :         if (ret) {
     112           0 :                 DRM_ERROR("Failed to create device file mem_info_preempt_used\n");
     113           0 :                 return ret;
     114             :         }
     115             : 
     116           0 :         ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, man);
     117           0 :         ttm_resource_manager_set_used(man, true);
     118           0 :         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           0 : void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev)
     130             : {
     131           0 :         struct ttm_resource_manager *man = &adev->mman.preempt_mgr;
     132             :         int ret;
     133             : 
     134           0 :         ttm_resource_manager_set_used(man, false);
     135             : 
     136           0 :         ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
     137           0 :         if (ret)
     138             :                 return;
     139             : 
     140           0 :         device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used);
     141             : 
     142           0 :         ttm_resource_manager_cleanup(man);
     143           0 :         ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL);
     144             : }