kernel/tools/power/cpupower/utils/idle_monitor/nhm_idle.c

   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_C3_RESIDENCY    0x3F8
  20 #define MSR_PKG_C6_RESIDENCY    0x3F9
  21 #define MSR_CORE_C3_RESIDENCY   0x3FC
  22 #define MSR_CORE_C6_RESIDENCY   0x3FD
  23
  24 #define MSR_TSC 0x10
  25
  26 #define NHM_CSTATE_COUNT 4
  27
  28 enum intel_nhm_id { C3 = 0, C6, PC3, PC6, TSC = 0xFFFF };
  29
  30 static int nhm_get_count_percent(unsigned int self_id, double *percent,
  31                                  unsigned int cpu);
  32
  33 static cstate_t nhm_cstates[NHM_CSTATE_COUNT] = {
  34         {
  35                 .name                   = "C3",
  36                 .desc                   = N_("Processor Core C3"),
  37                 .id                     = C3,
  38                 .range                  = RANGE_CORE,
  39                 .get_count_percent      = nhm_get_count_percent,
  40         },
  41         {
  42                 .name                   = "C6",
  43                 .desc                   = N_("Processor Core C6"),
  44                 .id                     = C6,
  45                 .range                  = RANGE_CORE,
  46                 .get_count_percent      = nhm_get_count_percent,
  47         },
  48
  49         {
  50                 .name                   = "PC3",
  51                 .desc                   = N_("Processor Package C3"),
  52                 .id                     = PC3,
  53                 .range                  = RANGE_PACKAGE,
  54                 .get_count_percent      = nhm_get_count_percent,
  55         },
  56         {
  57                 .name                   = "PC6",
  58                 .desc                   = N_("Processor Package C6"),
  59                 .id                     = PC6,
  60                 .range                  = RANGE_PACKAGE,
  61                 .get_count_percent      = nhm_get_count_percent,
  62         },
  63 };
  64
  65 static unsigned long long tsc_at_measure_start;
  66 static unsigned long long tsc_at_measure_end;
  67 static unsigned long long *previous_count[NHM_CSTATE_COUNT];
  68 static unsigned long long *current_count[NHM_CSTATE_COUNT];
  69 /* valid flag for all CPUs. If a MSR read failed it will be zero */
  70 static int *is_valid;
  71
  72 static int nhm_get_count(enum intel_nhm_id id, unsigned long long *val,
  73                         unsigned int cpu)
  74 {
  75         int msr;
  76
  77         switch (id) {
  78         case C3:
  79                 msr = MSR_CORE_C3_RESIDENCY;
  80                 break;
  81         case C6:
  82                 msr = MSR_CORE_C6_RESIDENCY;
  83                 break;
  84         case PC3:
  85                 msr = MSR_PKG_C3_RESIDENCY;
  86                 break;
  87         case PC6:
  88                 msr = MSR_PKG_C6_RESIDENCY;
  89                 break;
  90         case TSC:
  91                 msr = MSR_TSC;
  92                 break;
  93         default:
  94                 return -1;
  95         };
  96         if (read_msr(cpu, msr, val))
  97                 return -1;
  98
  99         return 0;
 100 }
 101
 102 static int nhm_get_count_percent(unsigned int id, double *percent,
 103                                  unsigned int cpu)
 104 {
 105         *percent = 0.0;
 106
 107         if (!is_valid[cpu])
 108                 return -1;
 109
 110         *percent = (100.0 *
 111                 (current_count[id][cpu] - previous_count[id][cpu])) /
 112                 (tsc_at_measure_end - tsc_at_measure_start);
 113
 114         dprint("%s: previous: %llu - current: %llu - (%u)\n",
 115                 nhm_cstates[id].name, previous_count[id][cpu],
 116                 current_count[id][cpu], cpu);
 117
 118         dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n",
 119                nhm_cstates[id].name,
 120                (unsigned long long) tsc_at_measure_end - tsc_at_measure_start,
 121                current_count[id][cpu] - previous_count[id][cpu],
 122                *percent, cpu);
 123
 124         return 0;
 125 }
 126
 127 static int nhm_start(void)
 128 {
 129         int num, cpu;
 130         unsigned long long dbg, val;
 131
 132         nhm_get_count(TSC, &tsc_at_measure_start, 0);
 133
 134         for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 135                 for (cpu = 0; cpu < cpu_count; cpu++) {
 136                         is_valid[cpu] = !nhm_get_count(num, &val, cpu);
 137                         previous_count[num][cpu] = val;
 138                 }
 139         }
 140         nhm_get_count(TSC, &dbg, 0);
 141         dprint("TSC diff: %llu\n", dbg - tsc_at_measure_start);
 142         return 0;
 143 }
 144
 145 static int nhm_stop(void)
 146 {
 147         unsigned long long val;
 148         unsigned long long dbg;
 149         int num, cpu;
 150
 151         nhm_get_count(TSC, &tsc_at_measure_end, 0);
 152
 153         for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 154                 for (cpu = 0; cpu < cpu_count; cpu++) {
 155                         is_valid[cpu] = !nhm_get_count(num, &val, cpu);
 156                         current_count[num][cpu] = val;
 157                 }
 158         }
 159         nhm_get_count(TSC, &dbg, 0);
 160         dprint("TSC diff: %llu\n", dbg - tsc_at_measure_end);
 161
 162         return 0;
 163 }
 164
 165 struct cpuidle_monitor intel_nhm_monitor;
 166
 167 struct cpuidle_monitor *intel_nhm_register(void)
 168 {
 169         int num;
 170
 171         if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL)
 172                 return NULL;
 173
 174         if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_INV_TSC))
 175                 return NULL;
 176
 177         if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_APERF))
 178                 return NULL;
 179
 180         /* Free this at program termination */
 181         is_valid = calloc(cpu_count, sizeof(int));
 182         for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 183                 previous_count[num] = calloc(cpu_count,
 184                                         sizeof(unsigned long long));
 185                 current_count[num]  = calloc(cpu_count,
 186                                         sizeof(unsigned long long));
 187         }
 188
 189         intel_nhm_monitor.name_len = strlen(intel_nhm_monitor.name);
 190         return &intel_nhm_monitor;
 191 }
 192
 193 void intel_nhm_unregister(void)
 194 {
 195         int num;
 196
 197         for (num = 0; num < NHM_CSTATE_COUNT; num++) {
 198                 free(previous_count[num]);
 199                 free(current_count[num]);
 200         }
 201         free(is_valid);
 202 }
 203
 204 struct cpuidle_monitor intel_nhm_monitor = {
 205         .name                   = "Nehalem",
 206         .hw_states_num          = NHM_CSTATE_COUNT,
 207         .hw_states              = nhm_cstates,
 208         .start                  = nhm_start,
 209         .stop                   = nhm_stop,
 210         .do_register            = intel_nhm_register,
 211         .unregister             = intel_nhm_unregister,
 212         .needs_root             = 1,
 213         .overflow_s             = 922000000 /* 922337203 seconds TSC overflow
 214                                                at 20GHz */
 215 };
 216 #endif