diff --git a/drivers/gpu/drm/amd/amdgpu/si_dma.c b/drivers/gpu/drm/amd/amdgpu/si_dma.c
index 4cbd408..de35819 100644
--- a/drivers/gpu/drm/amd/amdgpu/si_dma.c
+++ b/drivers/gpu/drm/amd/amdgpu/si_dma.c
@@ -495,6 +495,22 @@
 	amdgpu_ring_write(ring, (0 << 28) | 0x20); /* func(always) | poll interval */
 }
 
+static unsigned si_dma_ring_get_emit_ib_size(struct amdgpu_ring *ring)
+{
+	return
+		7 + 3; /* si_dma_ring_emit_ib */
+}
+
+static unsigned si_dma_ring_get_dma_frame_size(struct amdgpu_ring *ring)
+{
+	return
+		3 + /* si_dma_ring_emit_hdp_flush */
+		3 + /* si_dma_ring_emit_hdp_invalidate */
+		6 + /* si_dma_ring_emit_pipeline_sync */
+		12 + /* si_dma_ring_emit_vm_flush */
+		9 + 9 + 9; /* si_dma_ring_emit_fence x3 for user fence, vm fence */
+}
+
 static int si_dma_early_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -778,6 +794,8 @@
 	.test_ib = si_dma_ring_test_ib,
 	.insert_nop = amdgpu_ring_insert_nop,
 	.pad_ib = si_dma_ring_pad_ib,
+	.get_emit_ib_size = si_dma_ring_get_emit_ib_size,
+	.get_dma_frame_size = si_dma_ring_get_dma_frame_size,
 };
 
 static void si_dma_set_ring_funcs(struct amdgpu_device *adev)