guc_send_reg
intel_uncore_write(uncore, guc_send_reg(guc, i), request[i]);
intel_uncore_posting_read(uncore, guc_send_reg(guc, i - 1));
guc_send_reg(guc, 0),
#define done ({ header = intel_uncore_read(uncore, guc_send_reg(guc, 0)); \
guc_send_reg(guc, i));
guc_send_reg(guc, i),