I915_GEM_HWS_INDEX
intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno);
BUILD_BUG_ON(I915_GEM_HWS_INDEX & 1);
*cs++ = I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT;
#define I915_GEM_HWS_INDEX_ADDR (I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT)
return intel_read_status_page(engine, I915_GEM_HWS_INDEX);