IPEIR
drm_printf(m, "\tIPEIR: 0x%08x\n", ENGINE_READ(engine, IPEIR));
intel_uncore_write(uncore, IPEIR(RENDER_RING_BASE), 0);
ee->ipeir = ENGINE_READ(engine, IPEIR);
i810_readl(IPEIR, mmio),