int main(int argc, char **argv)
{
uint32_t pmuserenr;
MRC_PMU(pmuserenr, PMUSERENR);
if (!pmuserenr) {
fprintf(stderr, "User access to performance counters disabled, exiting\n");
return 1;
}
int cpu = getcpu();
printf("Executing CPU: %d\n", cpu);
// Set CPU affinity to make sure that the following code is executed on the
// CPU printed above.
setaff(cpu);
enable_pmn();
uint32_t pmcr, pmceid0, pmceid1;
MRC_PMU(pmcr, PMCR);
MRC_PMU(pmceid0, PMCEID0);
MRC_PMU(pmceid1, PMCEID1);
printf("PMCR: %"PRIx32"\n", pmcr);
printf("PMCEID0: %"PRIx32"\n", pmceid0);
printf("PMCEID1: %"PRIx32"\n", pmceid1);
set_pmn(0, CPU_CYCLES);
set_pmn(1, L1D_CACHE_LD);
set_pmn(2, L1D_CACHE_ST);
reset_pmn();
reset_ccnt();
// do some fake work
for (int i = 0; i < 50; i++) printf(".");
uint32_t cycles, cpu_cycles, l1d_cache_ld, l1d_cache_st;
MRC_PMU(cycles, PMCCNTR);
cpu_cycles = read_pmn(0);
l1d_cache_ld = read_pmn(1);
l1d_cache_st = read_pmn(2);
printf("\nCPU cycles: %"PRIu32"\n", cpu_cycles);
printf("Cycle Count: %"PRIu32"\n", cycles);
printf("Level 1 data cache access, read: %"PRIu32"\n", l1d_cache_ld);
printf("Level 1 data cache access, write: %"PRIu32"\n", l1d_cache_st);
return 0;
}
void pmu_start(void)
{
enable_pmu(); // Enable the PMU
ccnt_divider(0);
reset_ccnt(); // Reset the CCNT (cycle counter)
reset_pmn(); // Reset the configurable counters
pmn_config(0, perf_event[0]); // Configure counter 0 to count event code 0x03
pmn_config(1, perf_event[1]); // Configure counter 1 to count event code 0x03
pmn_config(2, perf_event[2]); // Configure counter 2 to count event code 0x03
pmn_config(3, perf_event[3]); // Configure counter 3 to count event code 0x03
pmn_config(4, perf_event[4]); // Configure counter 4 to count event code 0x03
pmn_config(5, perf_event[5]); // Configure counter 5 to count event code 0x03
enable_ccnt(); // Enable CCNT
enable_pmn(0); // Enable counter
enable_pmn(1); // Enable counter
enable_pmn(2); // Enable counter
enable_pmn(3); // Enable counter
enable_pmn(4); // Enable counter
enable_pmn(5); // Enable counter
}
