1 #include "pmu.h" 2 3 struct pmu_caps pmu; 4 5 void pmu_init(void) 6 { 7 struct cpuid cpuid_10 = cpuid(10); 8 9 pmu.version = cpuid_10.a & 0xff; 10 11 if (pmu.version > 1) { 12 pmu.nr_fixed_counters = cpuid_10.d & 0x1f; 13 pmu.fixed_counter_width = (cpuid_10.d >> 5) & 0xff; 14 } 15 16 pmu.nr_gp_counters = (cpuid_10.a >> 8) & 0xff; 17 pmu.gp_counter_width = (cpuid_10.a >> 16) & 0xff; 18 pmu.gp_counter_mask_length = (cpuid_10.a >> 24) & 0xff; 19 20 /* CPUID.0xA.EBX bit is '1' if a counter is NOT available. */ 21 pmu.gp_counter_available = ~cpuid_10.b; 22 23 if (this_cpu_has(X86_FEATURE_PDCM)) 24 pmu.perf_cap = rdmsr(MSR_IA32_PERF_CAPABILITIES); 25 pmu.msr_gp_counter_base = MSR_IA32_PERFCTR0; 26 pmu.msr_gp_event_select_base = MSR_P6_EVNTSEL0; 27 28 pmu_reset_all_counters(); 29 } 30