part_ev_reg
if (event_regs[event_id].map_reg == part_ev_reg) {
else if (event_regs[ctl.event_id].map_reg == part_ev_reg)
if (event_regs[eid].map_reg == part_ev_reg) {
#define EV_PAR(i, r)[i] = {offsetof(struct part_cfg_regs, r), part_ev_reg}