1 /* 2 * (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc. 3 * 4 * Licensed under the terms of the GNU GPL License version 2. 5 * 6 * Based on Len Brown's <lenb@kernel.org> turbostat tool. 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_C2_RESIDENCY 0x60D 20 #define MSR_PKG_C7_RESIDENCY 0x3FA 21 #define MSR_CORE_C7_RESIDENCY 0x3FE 22 23 #define MSR_TSC 0x10 24 25 enum intel_snb_id { C7 = 0, PC2, PC7, SNB_CSTATE_COUNT, TSC = 0xFFFF }; 26 27 static int snb_get_count_percent(unsigned int self_id, double *percent, 28 unsigned int cpu); 29 30 static cstate_t snb_cstates[SNB_CSTATE_COUNT] = { 31 { 32 .name = "C7", 33 .desc = N_("Processor Core C7"), 34 .id = C7, 35 .range = RANGE_CORE, 36 .get_count_percent = snb_get_count_percent, 37 }, 38 { 39 .name = "PC2", 40 .desc = N_("Processor Package C2"), 41 .id = PC2, 42 .range = RANGE_PACKAGE, 43 .get_count_percent = snb_get_count_percent, 44 }, 45 { 46 .name = "PC7", 47 .desc = N_("Processor Package C7"), 48 .id = PC7, 49 .range = RANGE_PACKAGE, 50 .get_count_percent = snb_get_count_percent, 51 }, 52 }; 53 54 static unsigned long long tsc_at_measure_start; 55 static unsigned long long tsc_at_measure_end; 56 static unsigned long long *previous_count[SNB_CSTATE_COUNT]; 57 static unsigned long long *current_count[SNB_CSTATE_COUNT]; 58 /* valid flag for all CPUs. If a MSR read failed it will be zero */ 59 static int *is_valid; 60 61 static int snb_get_count(enum intel_snb_id id, unsigned long long *val, 62 unsigned int cpu) 63 { 64 int msr; 65 66 switch (id) { 67 case C7: 68 msr = MSR_CORE_C7_RESIDENCY; 69 break; 70 case PC2: 71 msr = MSR_PKG_C2_RESIDENCY; 72 break; 73 case PC7: 74 msr = MSR_PKG_C7_RESIDENCY; 75 break; 76 case TSC: 77 msr = MSR_TSC; 78 break; 79 default: 80 return -1; 81 }; 82 if (read_msr(cpu, msr, val)) 83 return -1; 84 return 0; 85 } 86 87 static int snb_get_count_percent(unsigned int id, double *percent, 88 unsigned int cpu) 89 { 90 *percent = 0.0; 91 92 if (!is_valid[cpu]) 93 return -1; 94 95 *percent = (100.0 * 96 (current_count[id][cpu] - previous_count[id][cpu])) / 97 (tsc_at_measure_end - tsc_at_measure_start); 98 99 dprint("%s: previous: %llu - current: %llu - (%u)\n", 100 snb_cstates[id].name, previous_count[id][cpu], 101 current_count[id][cpu], cpu); 102 103 dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n", 104 snb_cstates[id].name, 105 (unsigned long long) tsc_at_measure_end - tsc_at_measure_start, 106 current_count[id][cpu] - previous_count[id][cpu], 107 *percent, cpu); 108 109 return 0; 110 } 111 112 static int snb_start(void) 113 { 114 int num, cpu; 115 unsigned long long val; 116 117 for (num = 0; num < SNB_CSTATE_COUNT; num++) { 118 for (cpu = 0; cpu < cpu_count; cpu++) { 119 snb_get_count(num, &val, cpu); 120 previous_count[num][cpu] = val; 121 } 122 } 123 snb_get_count(TSC, &tsc_at_measure_start, 0); 124 return 0; 125 } 126 127 static int snb_stop(void) 128 { 129 unsigned long long val; 130 int num, cpu; 131 132 snb_get_count(TSC, &tsc_at_measure_end, 0); 133 134 for (num = 0; num < SNB_CSTATE_COUNT; num++) { 135 for (cpu = 0; cpu < cpu_count; cpu++) { 136 is_valid[cpu] = !snb_get_count(num, &val, cpu); 137 current_count[num][cpu] = val; 138 } 139 } 140 return 0; 141 } 142 143 struct cpuidle_monitor intel_snb_monitor; 144 145 static struct cpuidle_monitor *snb_register(void) 146 { 147 int num; 148 149 if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL 150 || cpupower_cpu_info.family != 6) 151 return NULL; 152 153 switch (cpupower_cpu_info.model) { 154 case 0x2A: /* SNB */ 155 case 0x2D: /* SNB Xeon */ 156 case 0x3A: /* IVB */ 157 case 0x3E: /* IVB Xeon */ 158 case 0x3C: /* HSW */ 159 case 0x3F: /* HSW */ 160 case 0x45: /* HSW */ 161 case 0x46: /* HSW */ 162 break; 163 default: 164 return NULL; 165 } 166 167 is_valid = calloc(cpu_count, sizeof(int)); 168 for (num = 0; num < SNB_CSTATE_COUNT; num++) { 169 previous_count[num] = calloc(cpu_count, 170 sizeof(unsigned long long)); 171 current_count[num] = calloc(cpu_count, 172 sizeof(unsigned long long)); 173 } 174 intel_snb_monitor.name_len = strlen(intel_snb_monitor.name); 175 return &intel_snb_monitor; 176 } 177 178 void snb_unregister(void) 179 { 180 int num; 181 free(is_valid); 182 for (num = 0; num < SNB_CSTATE_COUNT; num++) { 183 free(previous_count[num]); 184 free(current_count[num]); 185 } 186 } 187 188 struct cpuidle_monitor intel_snb_monitor = { 189 .name = "SandyBridge", 190 .hw_states = snb_cstates, 191 .hw_states_num = SNB_CSTATE_COUNT, 192 .start = snb_start, 193 .stop = snb_stop, 194 .do_register = snb_register, 195 .unregister = snb_unregister, 196 .needs_root = 1, 197 .overflow_s = 922000000 /* 922337203 seconds TSC overflow 198 at 20GHz */ 199 }; 200 #endif /* defined(__i386__) || defined(__x86_64__) */ 201