gfx_v8_0_get_csb_size
r = amdgpu_ring_alloc(ring, gfx_v8_0_get_csb_size(adev) + 4);
.get_csb_size = gfx_v8_0_get_csb_size,
static u32 gfx_v8_0_get_csb_size(struct amdgpu_device *adev);