u64 perf_counter_read(struct perf_event *pevent){
u64 enabled = 0; u64 running = 0;
if(pevent != NULL){
//return local64_read(&pevent->count);
return perf_event_read_value(pevent, &enabled, &running);
}else{
printk(KERN_CRIT "***** PERFCT: event in task structure is null\n");
BUG();
return -1; //FIXME figure out how to handle this case
}
}
/**
* kvm_pmu_get_counter_value - get PMU counter value
* @vcpu: The vcpu pointer
* @select_idx: The counter index
*/
u64 kvm_pmu_get_counter_value(struct kvm_vcpu *vcpu, u64 select_idx)
{
u64 counter, reg, enabled, running;
struct kvm_pmu *pmu = &vcpu->arch.pmu;
struct kvm_pmc *pmc = &pmu->pmc[select_idx];
reg = (select_idx == ARMV8_PMU_CYCLE_IDX)
? PMCCNTR_EL0 : PMEVCNTR0_EL0 + select_idx;
counter = __vcpu_sys_reg(vcpu, reg);
/* The real counter value is equal to the value of counter register plus
* the value perf event counts.
*/
if (pmc->perf_event)
counter += perf_event_read_value(pmc->perf_event, &enabled,
&running);
return counter & pmc->bitmask;
}
