1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
new file mode 100644
index 000000000000..0b263a9857c6
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2018 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.
+ *
+ *
+ */
+#include <linux/list.h>
+#include "amdgpu.h"
+#include "amdgpu_xgmi.h"
+
+
+static DEFINE_MUTEX(xgmi_mutex);
+
+#define AMDGPU_MAX_XGMI_HIVE			8
+#define AMDGPU_MAX_XGMI_DEVICE_PER_HIVE		4
+
+static struct amdgpu_hive_info xgmi_hives[AMDGPU_MAX_XGMI_HIVE];
+static unsigned hive_count = 0;
+
+
+void *amdgpu_xgmi_hive_try_lock(struct amdgpu_hive_info *hive)
+{
+	return &hive->device_list;
+}
+
+struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
+{
+	int i;
+	struct amdgpu_hive_info *tmp;
+
+	if (!adev->gmc.xgmi.hive_id)
+		return NULL;
+	for (i = 0 ; i < hive_count; ++i) {
+		tmp = &xgmi_hives[i];
+		if (tmp->hive_id == adev->gmc.xgmi.hive_id)
+			return tmp;
+	}
+	if (i >= AMDGPU_MAX_XGMI_HIVE)
+		return NULL;
+
+	/* initialize new hive if not exist */
+	tmp = &xgmi_hives[hive_count++];
+	tmp->hive_id = adev->gmc.xgmi.hive_id;
+	INIT_LIST_HEAD(&tmp->device_list);
+	mutex_init(&tmp->hive_lock);
+
+	return tmp;
+}
+
+int amdgpu_xgmi_update_topology(struct amdgpu_hive_info *hive, struct amdgpu_device *adev)
+{
+	int ret = -EINVAL;
+
+	/* Each psp need to set the latest topology */
+	ret = psp_xgmi_set_topology_info(&adev->psp,
+					 hive->number_devices,
+					 &hive->topology_info);
+	if (ret)
+		dev_err(adev->dev,
+			"XGMI: Set topology failure on device %llx, hive %llx, ret %d",
+			adev->gmc.xgmi.node_id,
+			adev->gmc.xgmi.hive_id, ret);
+	else
+		dev_info(adev->dev, "XGMI: Set topology for node %d, hive 0x%llx.\n",
+			 adev->gmc.xgmi.physical_node_id,
+				 adev->gmc.xgmi.hive_id);
+
+	return ret;
+}
+
+int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
+{
+	struct psp_xgmi_topology_info *hive_topology;
+	struct amdgpu_hive_info *hive;
+	struct amdgpu_xgmi	*entry;
+	struct amdgpu_device *tmp_adev = NULL;
+
+	int count = 0, ret = -EINVAL;
+
+	if (!adev->gmc.xgmi.supported)
+		return 0;
+
+	adev->gmc.xgmi.node_id = psp_xgmi_get_node_id(&adev->psp);
+	adev->gmc.xgmi.hive_id = psp_xgmi_get_hive_id(&adev->psp);
+
+	mutex_lock(&xgmi_mutex);
+	hive = amdgpu_get_xgmi_hive(adev);
+	if (!hive)
+		goto exit;
+
+	hive_topology = &hive->topology_info;
+
+	list_add_tail(&adev->gmc.xgmi.head, &hive->device_list);
+	list_for_each_entry(entry, &hive->device_list, head)
+		hive_topology->nodes[count++].node_id = entry->node_id;
+	hive->number_devices = count;
+
+	/* Each psp need to get the latest topology */
+	list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head) {
+		ret = psp_xgmi_get_topology_info(&tmp_adev->psp, count, hive_topology);
+		if (ret) {
+			dev_err(tmp_adev->dev,
+				"XGMI: Get topology failure on device %llx, hive %llx, ret %d",
+				tmp_adev->gmc.xgmi.node_id,
+				tmp_adev->gmc.xgmi.hive_id, ret);
+			/* To do : continue with some node failed or disable the whole hive */
+			break;
+		}
+	}
+
+	list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head) {
+		ret = amdgpu_xgmi_update_topology(hive, tmp_adev);
+		if (ret)
+			break;
+	}
+
+exit:
+	mutex_unlock(&xgmi_mutex);
+	return ret;
+}
+
+void amdgpu_xgmi_remove_device(struct amdgpu_device *adev)
+{
+	struct amdgpu_hive_info *hive;
+
+	if (!adev->gmc.xgmi.supported)
+		return;
+
+	mutex_lock(&xgmi_mutex);
+
+	hive = amdgpu_get_xgmi_hive(adev);
+	if (!hive)
+		goto exit;
+
+	if (!(hive->number_devices--))
+		mutex_destroy(&hive->hive_lock);
+
+exit:
+	mutex_unlock(&xgmi_mutex);
+}