GEN8_OAHEADPTR    833 drivers/gpu/drm/i915/i915_perf.c 		I915_WRITE(GEN8_OAHEADPTR, head & GEN8_OAHEADPTR_MASK);
GEN8_OAHEADPTR   1452 drivers/gpu/drm/i915/i915_perf.c 	I915_WRITE(GEN8_OAHEADPTR, gtt_offset);