CB_RESERVED
CB_RESERVED + gr->size, 0, true, &data);
nvkm_wo32(inst, 0x0210, lower_32_bits(ctx->addr + CB_RESERVED) | 4);
nvkm_wo32(inst, 0x0214, upper_32_bits(ctx->addr + CB_RESERVED));
gr->data[i / 4] = nvkm_ro32(data, CB_RESERVED + i);