hsw_ext_idle.c (4708B)
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc. 4 * 5 * Based on SandyBridge monitor. Implements the new package C-states 6 * (PC8, PC9, PC10) coming with a specific Haswell (family 0x45) CPU. 7 */ 8 9#if defined(__i386__) || defined(__x86_64__) 10 11#include <stdio.h> 12#include <stdint.h> 13#include <stdlib.h> 14#include <string.h> 15 16#include "helpers/helpers.h" 17#include "idle_monitor/cpupower-monitor.h" 18 19#define MSR_PKG_C8_RESIDENCY 0x00000630 20#define MSR_PKG_C9_RESIDENCY 0x00000631 21#define MSR_PKG_C10_RESIDENCY 0x00000632 22 23#define MSR_TSC 0x10 24 25enum intel_hsw_ext_id { PC8 = 0, PC9, PC10, HSW_EXT_CSTATE_COUNT, 26 TSC = 0xFFFF }; 27 28static int hsw_ext_get_count_percent(unsigned int self_id, double *percent, 29 unsigned int cpu); 30 31static cstate_t hsw_ext_cstates[HSW_EXT_CSTATE_COUNT] = { 32 { 33 .name = "PC8", 34 .desc = N_("Processor Package C8"), 35 .id = PC8, 36 .range = RANGE_PACKAGE, 37 .get_count_percent = hsw_ext_get_count_percent, 38 }, 39 { 40 .name = "PC9", 41 .desc = N_("Processor Package C9"), 42 .id = PC9, 43 .range = RANGE_PACKAGE, 44 .get_count_percent = hsw_ext_get_count_percent, 45 }, 46 { 47 .name = "PC10", 48 .desc = N_("Processor Package C10"), 49 .id = PC10, 50 .range = RANGE_PACKAGE, 51 .get_count_percent = hsw_ext_get_count_percent, 52 }, 53}; 54 55static unsigned long long tsc_at_measure_start; 56static unsigned long long tsc_at_measure_end; 57static unsigned long long *previous_count[HSW_EXT_CSTATE_COUNT]; 58static unsigned long long *current_count[HSW_EXT_CSTATE_COUNT]; 59/* valid flag for all CPUs. If a MSR read failed it will be zero */ 60static int *is_valid; 61 62static int hsw_ext_get_count(enum intel_hsw_ext_id id, unsigned long long *val, 63 unsigned int cpu) 64{ 65 int msr; 66 67 switch (id) { 68 case PC8: 69 msr = MSR_PKG_C8_RESIDENCY; 70 break; 71 case PC9: 72 msr = MSR_PKG_C9_RESIDENCY; 73 break; 74 case PC10: 75 msr = MSR_PKG_C10_RESIDENCY; 76 break; 77 case TSC: 78 msr = MSR_TSC; 79 break; 80 default: 81 return -1; 82 } 83 if (read_msr(cpu, msr, val)) 84 return -1; 85 return 0; 86} 87 88static int hsw_ext_get_count_percent(unsigned int id, double *percent, 89 unsigned int cpu) 90{ 91 *percent = 0.0; 92 93 if (!is_valid[cpu]) 94 return -1; 95 96 *percent = (100.0 * 97 (current_count[id][cpu] - previous_count[id][cpu])) / 98 (tsc_at_measure_end - tsc_at_measure_start); 99 100 dprint("%s: previous: %llu - current: %llu - (%u)\n", 101 hsw_ext_cstates[id].name, previous_count[id][cpu], 102 current_count[id][cpu], cpu); 103 104 dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n", 105 hsw_ext_cstates[id].name, 106 (unsigned long long) tsc_at_measure_end - tsc_at_measure_start, 107 current_count[id][cpu] - previous_count[id][cpu], 108 *percent, cpu); 109 110 return 0; 111} 112 113static int hsw_ext_start(void) 114{ 115 int num, cpu; 116 unsigned long long val; 117 118 for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) { 119 for (cpu = 0; cpu < cpu_count; cpu++) { 120 hsw_ext_get_count(num, &val, cpu); 121 previous_count[num][cpu] = val; 122 } 123 } 124 hsw_ext_get_count(TSC, &tsc_at_measure_start, base_cpu); 125 return 0; 126} 127 128static int hsw_ext_stop(void) 129{ 130 unsigned long long val; 131 int num, cpu; 132 133 hsw_ext_get_count(TSC, &tsc_at_measure_end, base_cpu); 134 135 for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) { 136 for (cpu = 0; cpu < cpu_count; cpu++) { 137 is_valid[cpu] = !hsw_ext_get_count(num, &val, cpu); 138 current_count[num][cpu] = val; 139 } 140 } 141 return 0; 142} 143 144struct cpuidle_monitor intel_hsw_ext_monitor; 145 146static struct cpuidle_monitor *hsw_ext_register(void) 147{ 148 int num; 149 150 if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL 151 || cpupower_cpu_info.family != 6) 152 return NULL; 153 154 switch (cpupower_cpu_info.model) { 155 case 0x45: /* HSW */ 156 break; 157 default: 158 return NULL; 159 } 160 161 is_valid = calloc(cpu_count, sizeof(int)); 162 for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) { 163 previous_count[num] = calloc(cpu_count, 164 sizeof(unsigned long long)); 165 current_count[num] = calloc(cpu_count, 166 sizeof(unsigned long long)); 167 } 168 intel_hsw_ext_monitor.name_len = strlen(intel_hsw_ext_monitor.name); 169 return &intel_hsw_ext_monitor; 170} 171 172void hsw_ext_unregister(void) 173{ 174 int num; 175 free(is_valid); 176 for (num = 0; num < HSW_EXT_CSTATE_COUNT; num++) { 177 free(previous_count[num]); 178 free(current_count[num]); 179 } 180} 181 182struct cpuidle_monitor intel_hsw_ext_monitor = { 183 .name = "HaswellExtended", 184 .hw_states = hsw_ext_cstates, 185 .hw_states_num = HSW_EXT_CSTATE_COUNT, 186 .start = hsw_ext_start, 187 .stop = hsw_ext_stop, 188 .do_register = hsw_ext_register, 189 .unregister = hsw_ext_unregister, 190 .flags.needs_root = 1, 191 .overflow_s = 922000000 /* 922337203 seconds TSC overflow 192 at 20GHz */ 193}; 194#endif /* defined(__i386__) || defined(__x86_64__) */