GTFIFOCTL
s->gt_fifoctl = I915_READ(GTFIFOCTL);
I915_WRITE(GTFIFOCTL, s->gt_fifoctl);
u32 count = __raw_i915_read32(dev_priv, GTFIFOCTL);
__raw_i915_write32(dev_priv, GTFIFOCTL,
__raw_i915_read32(dev_priv, GTFIFOCTL) |