GEN8_GT_IER
reg = GEN8_GT_IER(2);
pm_ier = intel_uncore_read(uncore, GEN8_GT_IER(2));
MMIO_DH(GEN8_GT_IER(0), D_BDW_PLUS, NULL, intel_vgpu_reg_ier_handler);
MMIO_DH(GEN8_GT_IER(1), D_BDW_PLUS, NULL, intel_vgpu_reg_ier_handler);
MMIO_DH(GEN8_GT_IER(2), D_BDW_PLUS, NULL, intel_vgpu_reg_ier_handler);
MMIO_DH(GEN8_GT_IER(3), D_BDW_PLUS, NULL, intel_vgpu_reg_ier_handler);
intel_uncore_read(uncore, GEN8_GT_IER(i));
GEN8_GT_IER(which), \
MMIO_D(GEN8_GT_IER(0));
MMIO_D(GEN8_GT_IER(1));
MMIO_D(GEN8_GT_IER(2));
MMIO_D(GEN8_GT_IER(3));