GEN8_PAGE_SIZE    871 drivers/gpu/drm/i915/i915_gem_gtt.c #define GEN8_PTE_SHIFT (ilog2(GEN8_PAGE_SIZE))
GEN8_PAGE_SIZE    872 drivers/gpu/drm/i915/i915_gem_gtt.c #define GEN8_PDES (GEN8_PAGE_SIZE / sizeof(u64))