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 #include "amdgpu_smu.h"
  28
  29
  30 static DEFINE_MUTEX(xgmi_mutex);
  31
  32 #define AMDGPU_MAX_XGMI_HIVE                    8
  33 #define AMDGPU_MAX_XGMI_DEVICE_PER_HIVE         4
  34
  35 static struct amdgpu_hive_info xgmi_hives[AMDGPU_MAX_XGMI_HIVE];
  36 static unsigned hive_count = 0;
  37
  38 void *amdgpu_xgmi_hive_try_lock(struct amdgpu_hive_info *hive)
  39 {
  40         return &hive->device_list;
  41 }
  42
  43 /**
  44  * DOC: AMDGPU XGMI Support
  45  *
  46  * XGMI is a high speed interconnect that joins multiple GPU cards
  47  * into a homogeneous memory space that is organized by a collective
  48  * hive ID and individual node IDs, both of which are 64-bit numbers.
  49  *
  50  * The file xgmi_device_id contains the unique per GPU device ID and
  51  * is stored in the /sys/class/drm/card${cardno}/device/ directory.
  52  *
  53  * Inside the device directory a sub-directory 'xgmi_hive_info' is
  54  * created which contains the hive ID and the list of nodes.
  55  *
  56  * The hive ID is stored in:
  57  *   /sys/class/drm/card${cardno}/device/xgmi_hive_info/xgmi_hive_id
  58  *
  59  * The node information is stored in numbered directories:
  60  *   /sys/class/drm/card${cardno}/device/xgmi_hive_info/node${nodeno}/xgmi_device_id
  61  *
  62  * Each device has their own xgmi_hive_info direction with a mirror
  63  * set of node sub-directories.
  64  *
  65  * The XGMI memory space is built by contiguously adding the power of
  66  * two padded VRAM space from each node to each other.
  67  *
  68  */
  69
  70
  71 static ssize_t amdgpu_xgmi_show_hive_id(struct device *dev,
  72                 struct device_attribute *attr, char *buf)
  73 {
  74         struct amdgpu_hive_info *hive =
  75                         container_of(attr, struct amdgpu_hive_info, dev_attr);
  76
  77         return snprintf(buf, PAGE_SIZE, "%llu\n", hive->hive_id);
  78 }
  79
  80 static int amdgpu_xgmi_sysfs_create(struct amdgpu_device *adev,
  81                                     struct amdgpu_hive_info *hive)
  82 {
  83         int ret = 0;
  84
  85         if (WARN_ON(hive->kobj))
  86                 return -EINVAL;
  87
  88         hive->kobj = kobject_create_and_add("xgmi_hive_info", &adev->dev->kobj);
  89         if (!hive->kobj) {
  90                 dev_err(adev->dev, "XGMI: Failed to allocate sysfs entry!\n");
  91                 return -EINVAL;
  92         }
  93
  94         hive->dev_attr = (struct device_attribute) {
  95                 .attr = {
  96                         .name = "xgmi_hive_id",
  97                         .mode = S_IRUGO,
  98
  99                 },
 100                 .show = amdgpu_xgmi_show_hive_id,
 101         };
 102
 103         ret = sysfs_create_file(hive->kobj, &hive->dev_attr.attr);
 104         if (ret) {
 105                 dev_err(adev->dev, "XGMI: Failed to create device file xgmi_hive_id\n");
 106                 kobject_del(hive->kobj);
 107                 kobject_put(hive->kobj);
 108                 hive->kobj = NULL;
 109         }
 110
 111         return ret;
 112 }
 113
 114 static void amdgpu_xgmi_sysfs_destroy(struct amdgpu_device *adev,
 115                                     struct amdgpu_hive_info *hive)
 116 {
 117         sysfs_remove_file(hive->kobj, &hive->dev_attr.attr);
 118         kobject_del(hive->kobj);
 119         kobject_put(hive->kobj);
 120         hive->kobj = NULL;
 121 }
 122
 123 static ssize_t amdgpu_xgmi_show_device_id(struct device *dev,
 124                                      struct device_attribute *attr,
 125                                      char *buf)
 126 {
 127         struct drm_device *ddev = dev_get_drvdata(dev);
 128         struct amdgpu_device *adev = ddev->dev_private;
 129
 130         return snprintf(buf, PAGE_SIZE, "%llu\n", adev->gmc.xgmi.node_id);
 131
 132 }
 133
 134
 135 static DEVICE_ATTR(xgmi_device_id, S_IRUGO, amdgpu_xgmi_show_device_id, NULL);
 136
 137
 138 static int amdgpu_xgmi_sysfs_add_dev_info(struct amdgpu_device *adev,
 139                                          struct amdgpu_hive_info *hive)
 140 {
 141         int ret = 0;
 142         char node[10] = { 0 };
 143
 144         /* Create xgmi device id file */
 145         ret = device_create_file(adev->dev, &dev_attr_xgmi_device_id);
 146         if (ret) {
 147                 dev_err(adev->dev, "XGMI: Failed to create device file xgmi_device_id\n");
 148                 return ret;
 149         }
 150
 151         /* Create sysfs link to hive info folder on the first device */
 152         if (adev != hive->adev) {
 153                 ret = sysfs_create_link(&adev->dev->kobj, hive->kobj,
 154                                         "xgmi_hive_info");
 155                 if (ret) {
 156                         dev_err(adev->dev, "XGMI: Failed to create link to hive info");
 157                         goto remove_file;
 158                 }
 159         }
 160
 161         sprintf(node, "node%d", hive->number_devices);
 162         /* Create sysfs link form the hive folder to yourself */
 163         ret = sysfs_create_link(hive->kobj, &adev->dev->kobj, node);
 164         if (ret) {
 165                 dev_err(adev->dev, "XGMI: Failed to create link from hive info");
 166                 goto remove_link;
 167         }
 168
 169         goto success;
 170
 171
 172 remove_link:
 173         sysfs_remove_link(&adev->dev->kobj, adev->ddev->unique);
 174
 175 remove_file:
 176         device_remove_file(adev->dev, &dev_attr_xgmi_device_id);
 177
 178 success:
 179         return ret;
 180 }
 181
 182 static void amdgpu_xgmi_sysfs_rem_dev_info(struct amdgpu_device *adev,
 183                                           struct amdgpu_hive_info *hive)
 184 {
 185         device_remove_file(adev->dev, &dev_attr_xgmi_device_id);
 186         sysfs_remove_link(&adev->dev->kobj, adev->ddev->unique);
 187         sysfs_remove_link(hive->kobj, adev->ddev->unique);
 188 }
 189
 190
 191
 192 struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev, int lock)
 193 {
 194         int i;
 195         struct amdgpu_hive_info *tmp;
 196
 197         if (!adev->gmc.xgmi.hive_id)
 198                 return NULL;
 199
 200         mutex_lock(&xgmi_mutex);
 201
 202         for (i = 0 ; i < hive_count; ++i) {
 203                 tmp = &xgmi_hives[i];
 204                 if (tmp->hive_id == adev->gmc.xgmi.hive_id) {
 205                         if (lock)
 206                                 mutex_lock(&tmp->hive_lock);
 207                         mutex_unlock(&xgmi_mutex);
 208                         return tmp;
 209                 }
 210         }
 211         if (i >= AMDGPU_MAX_XGMI_HIVE) {
 212                 mutex_unlock(&xgmi_mutex);
 213                 return NULL;
 214         }
 215
 216         /* initialize new hive if not exist */
 217         tmp = &xgmi_hives[hive_count++];
 218
 219         if (amdgpu_xgmi_sysfs_create(adev, tmp)) {
 220                 mutex_unlock(&xgmi_mutex);
 221                 return NULL;
 222         }
 223
 224         tmp->adev = adev;
 225         tmp->hive_id = adev->gmc.xgmi.hive_id;
 226         INIT_LIST_HEAD(&tmp->device_list);
 227         mutex_init(&tmp->hive_lock);
 228         mutex_init(&tmp->reset_lock);
 229
 230         if (lock)
 231                 mutex_lock(&tmp->hive_lock);
 232         tmp->pstate = -1;
 233         mutex_unlock(&xgmi_mutex);
 234
 235         return tmp;
 236 }
 237
 238 int amdgpu_xgmi_set_pstate(struct amdgpu_device *adev, int pstate)
 239 {
 240         int ret = 0;
 241         struct amdgpu_hive_info *hive = amdgpu_get_xgmi_hive(adev, 0);
 242
 243         if (!hive)
 244                 return 0;
 245
 246         if (hive->pstate == pstate)
 247                 return 0;
 248
 249         dev_dbg(adev->dev, "Set xgmi pstate %d.\n", pstate);
 250
 251         if (is_support_sw_smu(adev))
 252                 ret = smu_set_xgmi_pstate(&adev->smu, pstate);
 253         if (ret)
 254                 dev_err(adev->dev,
 255                         "XGMI: Set pstate failure on device %llx, hive %llx, ret %d",
 256                         adev->gmc.xgmi.node_id,
 257                         adev->gmc.xgmi.hive_id, ret);
 258
 259         return ret;
 260 }
 261
 262 int amdgpu_xgmi_update_topology(struct amdgpu_hive_info *hive, struct amdgpu_device *adev)
 263 {
 264         int ret = -EINVAL;
 265
 266         /* Each psp need to set the latest topology */
 267         ret = psp_xgmi_set_topology_info(&adev->psp,
 268                                          hive->number_devices,
 269                                          &adev->psp.xgmi_context.top_info);
 270         if (ret)
 271                 dev_err(adev->dev,
 272                         "XGMI: Set topology failure on device %llx, hive %llx, ret %d",
 273                         adev->gmc.xgmi.node_id,
 274                         adev->gmc.xgmi.hive_id, ret);
 275
 276         return ret;
 277 }
 278
 279
 280 int amdgpu_xgmi_get_hops_count(struct amdgpu_device *adev,
 281                 struct amdgpu_device *peer_adev)
 282 {
 283         struct psp_xgmi_topology_info *top = &adev->psp.xgmi_context.top_info;
 284         int i;
 285
 286         for (i = 0 ; i < top->num_nodes; ++i)
 287                 if (top->nodes[i].node_id == peer_adev->gmc.xgmi.node_id)
 288                         return top->nodes[i].num_hops;
 289         return  -EINVAL;
 290 }
 291
 292 int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
 293 {
 294         struct psp_xgmi_topology_info *top_info;
 295         struct amdgpu_hive_info *hive;
 296         struct amdgpu_xgmi      *entry;
 297         struct amdgpu_device *tmp_adev = NULL;
 298
 299         int count = 0, ret = -EINVAL;
 300
 301         if (!adev->gmc.xgmi.supported)
 302                 return 0;
 303
 304         ret = psp_xgmi_get_node_id(&adev->psp, &adev->gmc.xgmi.node_id);
 305         if (ret) {
 306                 dev_err(adev->dev,
 307                         "XGMI: Failed to get node id\n");
 308                 return ret;
 309         }
 310
 311         ret = psp_xgmi_get_hive_id(&adev->psp, &adev->gmc.xgmi.hive_id);
 312         if (ret) {
 313                 dev_err(adev->dev,
 314                         "XGMI: Failed to get hive id\n");
 315                 return ret;
 316         }
 317
 318         hive = amdgpu_get_xgmi_hive(adev, 1);
 319         if (!hive) {
 320                 ret = -EINVAL;
 321                 dev_err(adev->dev,
 322                         "XGMI: node 0x%llx, can not match hive 0x%llx in the hive list.\n",
 323                         adev->gmc.xgmi.node_id, adev->gmc.xgmi.hive_id);
 324                 goto exit;
 325         }
 326
 327         top_info = &adev->psp.xgmi_context.top_info;
 328
 329         list_add_tail(&adev->gmc.xgmi.head, &hive->device_list);
 330         list_for_each_entry(entry, &hive->device_list, head)
 331                 top_info->nodes[count++].node_id = entry->node_id;
 332         top_info->num_nodes = count;
 333         hive->number_devices = count;
 334
 335         list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head) {
 336                 /* update node list for other device in the hive */
 337                 if (tmp_adev != adev) {
 338                         top_info = &tmp_adev->psp.xgmi_context.top_info;
 339                         top_info->nodes[count - 1].node_id = adev->gmc.xgmi.node_id;
 340                         top_info->num_nodes = count;
 341                 }
 342                 ret = amdgpu_xgmi_update_topology(hive, tmp_adev);
 343                 if (ret)
 344                         goto exit;
 345         }
 346
 347         /* get latest topology info for each device from psp */
 348         list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head) {
 349                 ret = psp_xgmi_get_topology_info(&tmp_adev->psp, count,
 350                                 &tmp_adev->psp.xgmi_context.top_info);
 351                 if (ret) {
 352                         dev_err(tmp_adev->dev,
 353                                 "XGMI: Get topology failure on device %llx, hive %llx, ret %d",
 354                                 tmp_adev->gmc.xgmi.node_id,
 355                                 tmp_adev->gmc.xgmi.hive_id, ret);
 356                         /* To do : continue with some node failed or disable the whole hive */
 357                         goto exit;
 358                 }
 359         }
 360
 361         if (!ret)
 362                 ret = amdgpu_xgmi_sysfs_add_dev_info(adev, hive);
 363
 364
 365         mutex_unlock(&hive->hive_lock);
 366 exit:
 367         if (!ret)
 368                 dev_info(adev->dev, "XGMI: Add node %d, hive 0x%llx.\n",
 369                          adev->gmc.xgmi.physical_node_id, adev->gmc.xgmi.hive_id);
 370         else
 371                 dev_err(adev->dev, "XGMI: Failed to add node %d, hive 0x%llx ret: %d\n",
 372                         adev->gmc.xgmi.physical_node_id, adev->gmc.xgmi.hive_id,
 373                         ret);
 374
 375         return ret;
 376 }
 377
 378 void amdgpu_xgmi_remove_device(struct amdgpu_device *adev)
 379 {
 380         struct amdgpu_hive_info *hive;
 381
 382         if (!adev->gmc.xgmi.supported)
 383                 return;
 384
 385         hive = amdgpu_get_xgmi_hive(adev, 1);
 386         if (!hive)
 387                 return;
 388
 389         if (!(hive->number_devices--)) {
 390                 amdgpu_xgmi_sysfs_destroy(adev, hive);
 391                 mutex_destroy(&hive->hive_lock);
 392                 mutex_destroy(&hive->reset_lock);
 393         } else {
 394                 amdgpu_xgmi_sysfs_rem_dev_info(adev, hive);
 395                 mutex_unlock(&hive->hive_lock);
 396         }
 397 }