drm/amdgpu: port SRIOV VF missed changes

port SRIOV VF missed changes from gfx_v9_0 to gfx_v9_4_3.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Zhigang Luo <Zhigang.Luo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c

@@ -1762,6 +1762,8 @@ static int gfx_v9_4_3_xcc_kiq_init_queue(struct amdgpu_ring *ring, int xcc_id)
 		((struct v9_mqd_allocation *)mqd)->dynamic_cu_mask = 0xFFFFFFFF;
 		((struct v9_mqd_allocation *)mqd)->dynamic_rb_mask = 0xFFFFFFFF;
 		mutex_lock(&adev->srbm_mutex);
+		if (amdgpu_sriov_vf(adev) && adev->in_suspend)
+			amdgpu_ring_clear_ring(ring);
 		soc15_grbm_select(adev, ring->me, ring->pipe, ring->queue, 0, GET_INST(GC, xcc_id));
 		gfx_v9_4_3_xcc_mqd_init(ring, xcc_id);
 		gfx_v9_4_3_xcc_kiq_init_register(ring, xcc_id);
@@ -1960,6 +1962,16 @@ static void gfx_v9_4_3_xcc_fini(struct amdgpu_device *adev, int xcc_id)
 	if (amdgpu_gfx_disable_kcq(adev, xcc_id))
 		DRM_ERROR("XCD %d KCQ disable failed\n", xcc_id);
 
+	if (amdgpu_sriov_vf(adev)) {
+		/* must disable polling for SRIOV when hw finished, otherwise
+		 * CPC engine may still keep fetching WB address which is already
+		 * invalid after sw finished and trigger DMAR reading error in
+		 * hypervisor side.
+		 */
+		WREG32_FIELD15_PREREG(GC, GET_INST(GC, xcc_id), CP_PQ_WPTR_POLL_CNTL, EN, 0);
+		return;
+	}
+
 	/* Use deinitialize sequence from CAIL when unbinding device
 	 * from driver, otherwise KIQ is hanging when binding back
 	 */
@@ -1984,7 +1996,8 @@ static int gfx_v9_4_3_hw_init(void *handle)
 	int r;
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	gfx_v9_4_3_init_golden_registers(adev);
+	if (!amdgpu_sriov_vf(adev))
+		gfx_v9_4_3_init_golden_registers(adev);
 
 	gfx_v9_4_3_constants_init(adev);