drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c

   1 /*
   2  * Copyright 2018 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  *
  23  */
  24 #include <linux/list.h>
  25 #include "amdgpu.h"
  26 #include "amdgpu_xgmi.h"
  27
  28
  29 static DEFINE_MUTEX(xgmi_mutex);
  30
  31 #define AMDGPU_MAX_XGMI_HIVE                    8
  32 #define AMDGPU_MAX_XGMI_DEVICE_PER_HIVE         4
  33
  34 static struct amdgpu_hive_info xgmi_hives[AMDGPU_MAX_XGMI_HIVE];
  35 static unsigned hive_count = 0;
  36
  37
  38 void *amdgpu_xgmi_hive_try_lock(struct amdgpu_hive_info *hive)
  39 {
  40         return &hive->device_list;
  41 }
  42
  43 struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
  44 {
  45         int i;
  46         struct amdgpu_hive_info *tmp;
  47
  48         if (!adev->gmc.xgmi.hive_id)
  49                 return NULL;
  50         for (i = 0 ; i < hive_count; ++i) {
  51                 tmp = &xgmi_hives[i];
  52                 if (tmp->hive_id == adev->gmc.xgmi.hive_id)
  53                         return tmp;
  54         }
  55         if (i >= AMDGPU_MAX_XGMI_HIVE)
  56                 return NULL;
  57
  58         /* initialize new hive if not exist */
  59         tmp = &xgmi_hives[hive_count++];
  60         tmp->hive_id = adev->gmc.xgmi.hive_id;
  61         INIT_LIST_HEAD(&tmp->device_list);
  62         mutex_init(&tmp->hive_lock);
  63
  64         return tmp;
  65 }
  66
  67 int amdgpu_xgmi_update_topology(struct amdgpu_hive_info *hive, struct amdgpu_device *adev)
  68 {
  69         int ret = -EINVAL;
  70
  71         /* Each psp need to set the latest topology */
  72         ret = psp_xgmi_set_topology_info(&adev->psp,
  73                                          hive->number_devices,
  74                                          &hive->topology_info);
  75         if (ret)
  76                 dev_err(adev->dev,
  77                         "XGMI: Set topology failure on device %llx, hive %llx, ret %d",
  78                         adev->gmc.xgmi.node_id,
  79                         adev->gmc.xgmi.hive_id, ret);
  80         else
  81                 dev_info(adev->dev, "XGMI: Set topology for node %d, hive 0x%llx.\n",
  82                          adev->gmc.xgmi.physical_node_id,
  83                                  adev->gmc.xgmi.hive_id);
  84
  85         return ret;
  86 }
  87
  88 int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
  89 {
  90         struct psp_xgmi_topology_info *hive_topology;
  91         struct amdgpu_hive_info *hive;
  92         struct amdgpu_xgmi      *entry;
  93         struct amdgpu_device *tmp_adev = NULL;
  94
  95         int count = 0, ret = -EINVAL;
  96
  97         if (!adev->gmc.xgmi.supported)
  98                 return 0;
  99
 100         ret = psp_xgmi_get_node_id(&adev->psp, &adev->gmc.xgmi.node_id);
 101         if (ret) {
 102                 dev_err(adev->dev,
 103                         "XGMI: Failed to get node id\n");
 104                 return ret;
 105         }
 106
 107         ret = psp_xgmi_get_hive_id(&adev->psp, &adev->gmc.xgmi.hive_id);
 108         if (ret) {
 109                 dev_err(adev->dev,
 110                         "XGMI: Failed to get hive id\n");
 111                 return ret;
 112         }
 113
 114         mutex_lock(&xgmi_mutex);
 115         hive = amdgpu_get_xgmi_hive(adev);
 116         if (!hive)
 117                 goto exit;
 118
 119         hive_topology = &hive->topology_info;
 120
 121         list_add_tail(&adev->gmc.xgmi.head, &hive->device_list);
 122         list_for_each_entry(entry, &hive->device_list, head)
 123                 hive_topology->nodes[count++].node_id = entry->node_id;
 124         hive->number_devices = count;
 125
 126         /* Each psp need to get the latest topology */
 127         list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head) {
 128                 ret = psp_xgmi_get_topology_info(&tmp_adev->psp, count, hive_topology);
 129                 if (ret) {
 130                         dev_err(tmp_adev->dev,
 131                                 "XGMI: Get topology failure on device %llx, hive %llx, ret %d",
 132                                 tmp_adev->gmc.xgmi.node_id,
 133                                 tmp_adev->gmc.xgmi.hive_id, ret);
 134                         /* To do : continue with some node failed or disable the whole hive */
 135                         break;
 136                 }
 137         }
 138
 139         list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head) {
 140                 ret = amdgpu_xgmi_update_topology(hive, tmp_adev);
 141                 if (ret)
 142                         break;
 143         }
 144
 145 exit:
 146         mutex_unlock(&xgmi_mutex);
 147         return ret;
 148 }
 149
 150 void amdgpu_xgmi_remove_device(struct amdgpu_device *adev)
 151 {
 152         struct amdgpu_hive_info *hive;
 153
 154         if (!adev->gmc.xgmi.supported)
 155                 return;
 156
 157         mutex_lock(&xgmi_mutex);
 158
 159         hive = amdgpu_get_xgmi_hive(adev);
 160         if (!hive)
 161                 goto exit;
 162
 163         if (!(hive->number_devices--))
 164                 mutex_destroy(&hive->hive_lock);
 165
 166 exit:
 167         mutex_unlock(&xgmi_mutex);
 168 }