// SPDX-License-Identifier: GPL-2.0-only /* * (C) 2010,2011 Thomas Renninger , Novell Inc. * * Based on Len Brown's turbostat tool. */ #if defined(__i386__) || defined(__x86_64__) #include #include #include #include #include "helpers/helpers.h" #include "idle_monitor/cpupower-monitor.h" #define MSR_PKG_C3_RESIDENCY 0x3F8 #define MSR_PKG_C6_RESIDENCY 0x3F9 #define MSR_CORE_C3_RESIDENCY 0x3FC #define MSR_CORE_C6_RESIDENCY 0x3FD #define MSR_TSC 0x10 #define NHM_CSTATE_COUNT 4 enum intel_nhm_id { C3 = 0, C6, PC3, PC6, TSC = 0xFFFF }; static int nhm_get_count_percent(unsigned int self_id, double *percent, unsigned int cpu); static cstate_t nhm_cstates[NHM_CSTATE_COUNT] = { { .name = "C3", .desc = N_("Processor Core C3"), .id = C3, .range = RANGE_CORE, .get_count_percent = nhm_get_count_percent, }, { .name = "C6", .desc = N_("Processor Core C6"), .id = C6, .range = RANGE_CORE, .get_count_percent = nhm_get_count_percent, }, { .name = "PC3", .desc = N_("Processor Package C3"), .id = PC3, .range = RANGE_PACKAGE, .get_count_percent = nhm_get_count_percent, }, { .name = "PC6", .desc = N_("Processor Package C6"), .id = PC6, .range = RANGE_PACKAGE, .get_count_percent = nhm_get_count_percent, }, }; static unsigned long long tsc_at_measure_start; static unsigned long long tsc_at_measure_end; static unsigned long long *previous_count[NHM_CSTATE_COUNT]; static unsigned long long *current_count[NHM_CSTATE_COUNT]; /* valid flag for all CPUs. If a MSR read failed it will be zero */ static int *is_valid; static int nhm_get_count(enum intel_nhm_id id, unsigned long long *val, unsigned int cpu) { int msr; switch (id) { case C3: msr = MSR_CORE_C3_RESIDENCY; break; case C6: msr = MSR_CORE_C6_RESIDENCY; break; case PC3: msr = MSR_PKG_C3_RESIDENCY; break; case PC6: msr = MSR_PKG_C6_RESIDENCY; break; case TSC: msr = MSR_TSC; break; default: return -1; } if (read_msr(cpu, msr, val)) return -1; return 0; } static int nhm_get_count_percent(unsigned int id, double *percent, unsigned int cpu) { *percent = 0.0; if (!is_valid[cpu]) return -1; *percent = (100.0 * (current_count[id][cpu] - previous_count[id][cpu])) / (tsc_at_measure_end - tsc_at_measure_start); dprint("%s: previous: %llu - current: %llu - (%u)\n", nhm_cstates[id].name, previous_count[id][cpu], current_count[id][cpu], cpu); dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n", nhm_cstates[id].name, (unsigned long long) tsc_at_measure_end - tsc_at_measure_start, current_count[id][cpu] - previous_count[id][cpu], *percent, cpu); return 0; } static int nhm_start(void) { int num, cpu; unsigned long long dbg, val; nhm_get_count(TSC, &tsc_at_measure_start, base_cpu); for (num = 0; num < NHM_CSTATE_COUNT; num++) { for (cpu = 0; cpu < cpu_count; cpu++) { is_valid[cpu] = !nhm_get_count(num, &val, cpu); previous_count[num][cpu] = val; } } nhm_get_count(TSC, &dbg, base_cpu); dprint("TSC diff: %llu\n", dbg - tsc_at_measure_start); return 0; } static int nhm_stop(void) { unsigned long long val; unsigned long long dbg; int num, cpu; nhm_get_count(TSC, &tsc_at_measure_end, base_cpu); for (num = 0; num < NHM_CSTATE_COUNT; num++) { for (cpu = 0; cpu < cpu_count; cpu++) { is_valid[cpu] |= !nhm_get_count(num, &val, cpu); current_count[num][cpu] = val; } } nhm_get_count(TSC, &dbg, base_cpu); dprint("TSC diff: %llu\n", dbg - tsc_at_measure_end); return 0; } struct cpuidle_monitor intel_nhm_monitor; struct cpuidle_monitor *intel_nhm_register(void) { int num; if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL) return NULL; if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_INV_TSC)) return NULL; if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_APERF)) return NULL; /* Free this at program termination */ is_valid = calloc(cpu_count, sizeof(int)); for (num = 0; num < NHM_CSTATE_COUNT; num++) { previous_count[num] = calloc(cpu_count, sizeof(unsigned long long)); current_count[num] = calloc(cpu_count, sizeof(unsigned long long)); } intel_nhm_monitor.name_len = strlen(intel_nhm_monitor.name); return &intel_nhm_monitor; } void intel_nhm_unregister(void) { int num; for (num = 0; num < NHM_CSTATE_COUNT; num++) { free(previous_count[num]); free(current_count[num]); } free(is_valid); } struct cpuidle_monitor intel_nhm_monitor = { .name = "Nehalem", .hw_states_num = NHM_CSTATE_COUNT, .hw_states = nhm_cstates, .start = nhm_start, .stop = nhm_stop, .do_register = intel_nhm_register, .unregister = intel_nhm_unregister, .flags.needs_root = 1, .overflow_s = 922000000 /* 922337203 seconds TSC overflow at 20GHz */ }; #endif