GEN8_OATAILPTR_MASK 422 drivers/gpu/drm/i915/i915_perf.c return I915_READ(GEN8_OATAILPTR) & GEN8_OATAILPTR_MASK; GEN8_OATAILPTR_MASK 1467 drivers/gpu/drm/i915/i915_perf.c I915_WRITE(GEN8_OATAILPTR, gtt_offset & GEN8_OATAILPTR_MASK);