drm/amdgpu: share drm device for pci amdgpu device with 1st partition device

To save render node resoure, share drm device setting for pci amdgpu
device with 1st XCP partition device.
Signed-off-by: James Zhu <James.Zhu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -234,7 +234,10 @@ static int amdgpu_xcp_dev_alloc(struct amdgpu_device *adev)
 
 	ddev = adev_to_drm(adev);
 
-	for (i = 0; i < MAX_XCP; i++) {
+	/* xcp #0 shares drm device setting with adev */
+	adev->xcp_mgr->xcp->ddev = ddev;
+
+	for (i = 1; i < MAX_XCP; i++) {
 		ret = amdgpu_xcp_drm_dev_alloc(&p_ddev);
 		if (ret)
 			return ret;
@@ -324,7 +327,7 @@ int amdgpu_xcp_dev_register(struct amdgpu_device *adev,
 	if (!adev->xcp_mgr)
 		return 0;
 
-	for (i = 0; i < MAX_XCP; i++) {
+	for (i = 1; i < MAX_XCP; i++) {
 		ret = drm_dev_register(adev->xcp_mgr->xcp[i].ddev, ent->driver_data);
 		if (ret)
 			return ret;
@@ -341,7 +344,7 @@ void amdgpu_xcp_dev_unplug(struct amdgpu_device *adev)
 	if (!adev->xcp_mgr)
 		return;
 
-	for (i = 0; i < MAX_XCP; i++) {
+	for (i = 1; i < MAX_XCP; i++) {
 		p_ddev = adev->xcp_mgr->xcp[i].ddev;
 		drm_dev_unplug(p_ddev);
 		p_ddev->render->dev = adev->xcp_mgr->xcp[i].rdev;