drm/amdgpu: Handle xgmi device removal.

XGMI hive has some resources allocted on device init which
needs to be deallocated when the device is unregistered.

v2: Remove creation of dedicated wq for XGMI hive reset.
v3: Use the gmc.xgmi.supported flag
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1864,6 +1864,9 @@ static int amdgpu_device_ip_fini(struct amdgpu_device *adev)
 {
 	int i, r;
 
+	if (adev->gmc.xgmi.num_physical_nodes > 1)
+		amdgpu_xgmi_remove_device(adev);
+
 	amdgpu_amdkfd_device_fini(adev);
 
 	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);

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

@@ -135,3 +135,23 @@ int amdgpu_xgmi_add_device(struct amdgpu_device *adev)
 	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);
+}

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

@@ -35,5 +35,6 @@ struct amdgpu_hive_info {
 struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev);
 int amdgpu_xgmi_update_topology(struct amdgpu_hive_info *hive, struct amdgpu_device *adev);
 int amdgpu_xgmi_add_device(struct amdgpu_device *adev);
+void amdgpu_xgmi_remove_device(struct amdgpu_device *adev);
 
 #endif