PMU_FL_TFA
if (x86_pmu.flags & (PMU_FL_EXCL_CNTRS | PMU_FL_TFA | PMU_FL_DYN_CONSTRAINT)) {
if (x86_pmu.flags & PMU_FL_TFA) {
return x86_pmu.flags & PMU_FL_TFA ? attr->mode : 0;
x86_pmu.flags |= PMU_FL_TFA;