drm/amdgpu: set default num_kcq to 2 under sriov

The number of kernel queues has impact on the latency under sriov
usecase. So to reduce the latency we set the default num_kcq = 2 under
sriov if not set manually.
Signed-off-by: YuBiao Wang <YuBiao.Wang@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_virt.c

@@ -68,6 +68,9 @@ void amdgpu_virt_init_setting(struct amdgpu_device *adev)
 	/* enable mcbp for sriov */
 	amdgpu_mcbp = 1;
 
+	/* Reduce kcq number to 2 to reduce latency */
+	if (amdgpu_num_kcq == -1)
+		amdgpu_num_kcq = 2;
 }
 
 void amdgpu_virt_kiq_reg_write_reg_wait(struct amdgpu_device *adev,